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Nsk Ltd patents


Recent patent applications related to Nsk Ltd. Nsk Ltd is listed as an Agent/Assignee. Note: Nsk Ltd may have other listings under different names/spellings. We're not affiliated with Nsk Ltd, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "N" | Nsk Ltd-related inventors


Motor control unit and electric power steering apparatus equipped with the same

A motor control unit that extracts a higher harmonic component, which is contained in back-emfs of the dq-axis control system, by means of taylor expansion (maclaurin expansion), and suppresses a torque variation by precisely correcting a gain and a phase of the higher harmonic component for a q-axis current command value and the electric power steering apparatus equipped with the same. The motor control unit drives a brushless motor having three or more phases by using a vector control on a dq-axis rotary coordinate system.. ... Nsk Ltd

Combined ball bearing, main spindle device, and machine tool

A matched ball bearing includes four or more rows of angular ball bearings axially aligned, two or more rows of the angular ball bearings with contact angles in a same direction being arranged in a back-to-back combination. The respective angular ball bearings have same inner diameters, respectively. ... Nsk Ltd

Position adjustment device for steering wheel

Non-circular portions (41) are provided in two positions of an adjusting rod (17a) in an axial direction, and the non-circular portions (41) are disposed inside of telescopic-adjusting long holes (16a) of a displacement bracket (13a). Up-down-direction clearances (44a and 44b) which are present between opposite edges of each of the non-circular portions (41) in an up-down direction and inner surfaces of each of the telescopic-adjusting long holes (16a) in the up-down direction in a state where a position of a steering wheel can be maintained are less than up-down-direction clearances (43a and 43b) which are present between the opposite edges of each of the non-circular portions (41) in the up-down direction and the inner surfaces of each of the telescopic-adjusting long holes (16a) in the up-down direction in a state where the position of the steering wheel can be adjusted. ... Nsk Ltd

Motor drive control apparatus, electric power steering apparatus, and vehicle

. . The motor drive control apparatus includes first and second rotation information detection function units and a power control unit. When it is determined the ignition switch is changed from the on state to the off state, the power control unit intermittently supplies power from a battery to the first and second rotation information detection function units at a first interval while a motor rotation number is lower than a preset rotation number set in advance. ... Nsk Ltd

Outer column with bracket, steering column with bracket, and steering device

The slits (25, 25), which is configured to lower a rigidity of the outer column in a radial direction, are provided on both side portions in a width direction, which interpose a central portion in the width direction on an upper half portion, of the tubular outer column (12a) in a state where the slits (25, 25) extend only in an axial direction respectively. A pair of coupling plate parts (28, 28) configuring the column side bracket (16a) are fixed to positions, which interpose each of the slits (25, 25) therebetween from both sides in the width direction, of an outer peripheral surface of the outer column (12a). ... Nsk Ltd

Position adjusting apparatus for steering wheel

In a steering wheel position adjusting device, an inner side surface of a support plate part (19a) includes a pair of protrusion parts (31a, 31b), which are positioned on both sides of the pressed-part back surfaces (24a) in a front-rear direction and interpose the pressed-part back surfaces (24a), the pressed-part back surface (24a) is positioned on a back side of a portion where the outer side surface of the support plate part (19) is pressed by a driven-side cam (35), and only tip end surfaces of the protrusion parts (31a, 31b) are changed from an unclamped state to a clamped state. In clamped state, the tip end surfaces of the protrusion parts (31a, 31b) and the pressed-part back surfaces (24a) are pressed against an outer side surface of a displacement bracket (16a).. ... Nsk Ltd

Electric power steering apparatus

An electric power steering apparatus that enables implementation of a desired steering torque without being affected by a state of a road surface by controlling a steering torque so as to become a value corresponding a steering angle and a steering angular velocity. The apparatus includes a sat compensation value calculating section that calculates a sat compensation value based on a sat value; and a steering reaction compensation value calculating section that calculates a steering reaction compensation value based on the sat compensation value, a steering angle and a steering angular velocity, and corrects the current command value by the steering reaction compensation value. ... Nsk Ltd

Steering device

A steering device includes a cylindrical inner column that supports an input shaft connected to a steering wheel so as to allow the input shaft to be rotatable, a cylindrical outer column into which at least a part of the inner column is inserted, and a cylindrical lower column that supports an output shaft connected to the input shaft so as to allow the output shaft to be rotatable and is supported by a dash panel. The lower column moves to a rear side at the time of a primary collision, and the inner column and the outer column move relative to each other at the time of a secondary collision.. ... Nsk Ltd

Rack shaft and method for producing same

There is provided a manufacturing method of a rack shaft which includes rack teeth formed on an axial portion thereof. A specific stroke is constant at least at a predetermined axial position of the rack teeth. ... Nsk Ltd

Method and system for producing ring-shaped member for vehicle, and synchronizer ring

A method and a system for producing a ring-shaped member. A punching process is carried out on an axial intermediate part of a first intermediate annular material so as to produce a pair of ring-shaped members. ... Nsk Ltd

Electronic control unit and electric power steering apparatus equipped with the same

An electronic control unit diagnoses a short failure of an inverter fets and diagnoses whether the failure of the fet-short detecting section has occurred. The unit controls a motor through an inverter including a bridge having an upper-stage fets and a lower-stage fets via an mcu, having: an fet-short detecting section to detect a short failure of the upper-stage fets and the lower-stage fets based on respective connection point voltages of the upper-stage fets and the lower-stage fets; and a diagnostic function to detect a failure of the fet-short detecting section. ... Nsk Ltd

Ball screw, machine tool, and conveying device

There is provided a ball screw, a machine tool, and a conveying device that achieve the suppression of the vibration even when the nut rotates at high speed and the reduction of the manufacturing cost. The ball screw includes a screw shaft, a nut body, rolling bodies, a synthetic-resin covering member, and a circulation member. ... Nsk Ltd

Method and device for manufacturing bearing unit

A method of manufacturing a rotating bearing unit includes to cause one end surface in the axial direction of the forming punch (46), formed by combining a plurality of punch elements (46, 46) divided in the circumferential direction, which are displaceable in the axial direction and which are not displaceable in the circumferential direction, and having a processing teeth (44, 44) at one end surface in the axial direction, to face the other end surface of the caulking section (20) in the axial direction. In this state, rolls (30a) are rotated about the central axis (a) of the hub main body (8) while pressing the other end surface of the forming punch (46) in the axial direction with a pressing surface (43) of the roll (30a) having a central axis (β) that is inclined with respect to the central axis (α) of the hub main body (8).. ... Nsk Ltd

Electric power steering apparatus

An electric power steering apparatus includes a steering angle control section that calculates a steering angle control current command value for the steering angle control, calculates the current command value using at least the steering angle control current command value; the steering angle control section includes a position control section that calculates a basic steering angular velocity command value, a steering intervention compensating section that obtains a compensatory steering angular velocity command value, and a steering angular velocity control section that calculates the steering angle control current command value by the basic steering angular velocity command value, the compensatory steering angular velocity command value and an actual steering angular velocity; the steering intervention compensating section includes a compensation gain section that multiplies the steering torque by a steering intervention compensation gain, and obtains the compensatory steering angular velocity command value by the steering torque through the compensation gain section.. . ... Nsk Ltd

07/12/18 / #20180195602

Worm reducer

. . The present invention provides a structure which reduces an axial dimension of a front end-side portion of a worm shaft in a worm reducer including a pressing means for reducing backlash at a meshing portion. The worm reducer includes a coil spring for pressing a rocking member, which is provided to be rockable about a rocking shaft, to one side in a rocking direction about the rocking shaft. ... Nsk Ltd

06/28/18 / #20180178828

Electric power steering apparatus

. . An electric power steering apparatus includes a torque control system to calculate a current command value and a current control system to control a motor current value passing through a motor based on the current command value. A first calculation period of the torque control system is equal to or longer than a second calculation period of the current control system. ... Nsk Ltd

06/21/18 / #20180172139

Cooling liquid discharge apparatus and ball screw apparatus

An object is to reduce the load on a driving device for turning a screw shaft (2) in a cooling liquid discharge apparatus (10) for use in a ball screw apparatus (100) used in a machine tool or the like to make the apparatus compact and to prevent an increase in the manufacturing cost. The cooling liquid discharge apparatus (10) according to the invention has a housing (14) that is provided with proximity portions (5d, 6f) that extend radially inwardly to be close to the screw shaft 2 and reservoirs (11, 12, 13) that temporally store cooling liquid (8), which are arranged alternately along the axial direction, and discharge ports (5e, 6e, 6g) through which cooling liquid (8) is discharged from the reservoirs (11, 12, 13).. ... Nsk Ltd

06/21/18 / #20180172134

Worm reducer and electric assist device

A worm reducer which can be easily reduced in size is provided. A flange portion (30) which radially protrude outward is formed on an outer circumferential surface of an axial one end portion of an outer ring (19a) configuring a rolling bearing (18c) on an axial one side at an entire circumference. ... Nsk Ltd

06/21/18 / #20180172118

Friction-roller-type reduction gear

A pivot holder of a friction-roller-type reduction gear has a pair of bearing parts configured to support a rotational shaft of an intermediate roller and having a pivot axis at an eccentric position from a center of the rotational shaft, and a bridging part configured to integrally couple the pair of bearing parts. A carrier has a holder support part configured to rotatably support the bearing parts. ... Nsk Ltd

06/21/18 / #20180172075

Rolling bearing retainer, rolling bearing, and method for manufacturing rolling bearing retainer

A synthetic resin rolling bearing retainer is to be arranged between an inner ring and an outer ring of a rolling bearing. A plurality of guided portions protruding radially outward from an outer diameter surface of the retainer is provided along a circumferential direction of the outer diameter surface. ... Nsk Ltd

06/21/18 / #20180170422

Electric power steering apparatus

An electric power steering apparatus that reduces an uncomfortable feeling due to a noise at a steering holding and a low-speed steering time, and can smoothly steers so as to prevent a phase-lag at a high-speed steering time. The apparatus has a torque control section to calculate a current command value based on at least a steering torque, and assist-controls a steering system by driving a motor using a current control system based on the current command value. ... Nsk Ltd

06/21/18 / #20180170421

Electric power steering apparatus

An electric power steering apparatus including a torque sensor to detect a steering torque and a motor control unit to control a motor that applies an assist torque to a steering system of a vehicle, including a function to switch a control system of the motor between a torque control system to control a motor output torque and a position/speed control system to control a steering angle of a steering in accordance with a predetermined switching trigger, such that a fade processing switches from the torque control system to the position/speed control system or vice versa.. . ... Nsk Ltd

06/21/18 / #20180169735

Method for manufacturing rolling bearing unit and method for manufacturing vehicle

A method for manufacturing a rolling bearing unit is provided to periodically reciprocate a stage (38) in a vertical direction by rotating and driving a servo motor (44) while rotating a roll about a central axis of a hub main body using a roll driving motor (43) in a state in which a processing surface of the roll is pressed against other end surface of a caulking section in an axial direction. A period of the reciprocation is restricted by a relation between a rotation position of the roll about the central axis of the hub main body and an engaged state between concave sections, which are sections between a plurality of processed teeth formed in the processing surface of the roll, and a face spline tooth formed by the concave section.. ... Nsk Ltd

06/14/18 / #20180162440

Power-source voltage diagnostic device of electric power steering apparatus

A power-source voltage diagnostic device of an electric power steering apparatus that improves the performance for the anomalous detection of the motor power-source voltage vr-detecting circuit and is capable of continuing the assist control even if the extraordinary state is detected. When the failure (extraordinary state) detection of the vr-detecting circuit is performed by using the correlation between vbat1-voltage obtained by the detecting section (vbat1-detecting circuit) to detect the control voltage from the control power-source circuit and vr-voltage obtained by the detecting circuit (vr-detecting circuit) to detect the motor power-source voltage from the power source circuit, multiplexing is performed by providing vr-detecting circuits (vr-detecting circuit 1, vr-detecting circuit 2) of two systems and mutually comparing them so as to accurately perform the failure diagnosis of the vr-detecting circuits.. ... Nsk Ltd

06/07/18 / #20180156325

Worm reduction gear

. . A pair of wedge-shaped pieces are provided in an annular space that is defined between an inner circumferential surface of a holding recess portion and an outer circumferential surface of a bearing holder in two position that are symmetrical with each other with respect to a meshing portion between a worm wheel and worm teeth and an imaginary plane α that contains a center axis of a worm in such a way as to fill the annular space. Then, an elastic force is imparted to both the wedge-shaped pieces in a direction in which the pair of wedge-shaped pieces move away from the meshing portion in relation to a circumferential direction.. ... Nsk Ltd

06/07/18 / #20180154929

Electric power steering apparatus

An electric power steering apparatus that has a torque sensor which detects a steering torque, and a motor control apparatus to control the motor which applies an assist torque, by which steering is assisted, to a steering system of a vehicle, including: a function that switches a control system of the motor between an angle control system to control an angle corresponding to an angle control command value of an automatic steering mode and a torque control system to control a torque corresponding to a torque control command value of a manual steering mode in accordance with a predetermined switching trigger, wherein the steering apparatus variably sets a gradual-changing time corresponding to a command value difference between the angle control command value and the torque control command value when switching from the angle control system to the torque control system by using a gradual-changing.. . ... Nsk Ltd

06/07/18 / #20180154926

Relative angle detection device, torque sensor, electric power steering device and vehicle

There are provided a relative angle detection device suitable for expanding a torque detection range, and a torque sensor, an electric power steering device and a vehicle including the relative angle detection device. Based on a first sine signal representing sin(θos+Δθ) and a first cosine signal representing cos(θos+Δθ) in accordance with a rotation angle(θis) of a first multipolar ring magnet that synchronously rotates with an input shaft from between the coaxially arranged input shaft and an output shaft, and based on a second sine signal representing sin θos and a second cosine signal representing cos θos in accordance with a rotation angle(θos) of a second multipolar ring magnet that synchronously rotates with the output shaft, sin Δθ and cos Δθ are calculated in accordance with a relative angle(Δθ) between the input shaft and the output shaft, and from Δθ=arctan(sin Δθ/cos Δθ), the relative angle(Δθ) is calculated.. ... Nsk Ltd

05/31/18 / #20180149206

Manufacturing method for rolling bearing units for wheel support

A method of manufacturing a rolling bearing unit for supporting a wheel includes detecting a current value flowing through an electric motor (19) configured to drive a roll (22) and determining a time to terminate a caulking process on the basis of the detected value when a caulking section (13) is formed by pressing the roll (22), inclined with respect to a central axis of a hub main body (7) and supported in a rotatable state about a central axis of the roll, against a cylindrical section (12), installed on an inner end portion of the hub main body (7) in the axial direction, while the roll (22) is rotated about the central axis of the hub main body (7).. . ... Nsk Ltd

05/24/18 / #20180141583

Brushless motor, and electric power steering apparatus and vehicle equipped with the same

A brushless motor that is smaller in appearance configuration, lighter, and easy to manufacture, and has a terminal connecting mechanism with an integral structure including mounting of a motor bus bar and an ecu terminal, and an electric power steering apparatus and a vehicle equipped therewith. The brushless motor includes a nut-integrated terminal connecting mechanism for inserting a motor bus bar terminal and an ecu terminal for connecting with a bolt and nut.. ... Nsk Ltd

05/10/18 / #20180128363

Steering rack and manufacturing method therefor

A steering rack includes a rack shaft (10), a plurality of rack teeth (11a) formed on the rack shaft and each having a tooth trace inclined with respect to a first direction perpendicular to an axial direction of the rack shaft, and a dummy tooth (33a) aligned with the rack teeth and formed on the rack shaft. The dummy tooth (33a) is non-uniformly formed in a second direction parallel to the tooth trace of the rack tooth (11a).. ... Nsk Ltd

05/03/18 / #20180120264

Abnormal noise detection method of steering system and evaluation device of steering system

An abnormal noise detection method of a steering system is configured to detect an abnormal noise from the steering system. The steering system includes a column shaft configured to rotatably support a steering wheel and is configured to steer a wheel in response to rotations of the column shaft. ... Nsk Ltd

04/05/18 / #20180093702

Motor control apparatus, electric power steering apparatus, and vehicle

There are provided a motor control apparatus, an electric power steering apparatus, and a vehicle, capable of controlling the driving of an electric motor accurately even when a failure occurs in a motor electric angle detecting unit that detects a motor electric angle. The motor control apparatus includes: a relative offset amount estimating unit that estimates a relative offset amount between a reference value of an output shaft rotational angle detection value of a steering shaft, detected by an output-side rotational angle sensor, and a motor electric angle original point of a three-phase electric motor; and a motor electric angle estimating unit that calculates a motor electric angle estimate (θme) based on the output shaft rotational angle and the relative offset amount, wherein when at least either one of a resolver and an angle computing unit is abnormal, the driving of the three-phase electric motor is controlled based on the motor electric angle estimate estimated by the motor electric angle estimating unit.. ... Nsk Ltd

03/29/18 / #20180087636

Screw shaft, manufacturing method thereof, and ball screw device

Provided is a screw shaft in a ball screw device. At least a part of the screw shaft includes a cylindrical body which is manufactured by a filament winding method or a sheet winding method, and a spiral member or a partitioned spiral member which is fixed to an outer circumferential surface of the cylindrical body and forms a thread groove.. ... Nsk Ltd

03/22/18 / #20180080502

Torque transmission joint and worm reduction gear

A drive-side concavo-convex part (26, 26a) is made to engage the half of a cup-side concavo-convex part (35) which is on the other side in the axial direction, while the central axes of a drive shaft (12a) and a driven shaft (8a) are aligned with each other, and drive-side gaps (36, 36a), the width of which in the circumferential direction increases toward the other side in the axial direction, are interposed between the circumferential side surface of each drive-side convex part (25, 25a) and the circumferential side surface of each cup-side convex part (34). In addition, a driven-side concavo-convex part (32, 32a) is made to engage the half of the cup-side concavo-convex part (35) which is on the one side in the axial direction, while the central axes of the drive shaft (12a) and the driven shaft (8a) are aligned with each other, and driven-side gaps (37, 37a), the width of which in the circumferential direction increases toward the one side in the axial direction, are interposed between the circumferential side surface of each driven-side convex part (31, 31a) and the circumferential side surface of each cup-side convex part (34).. ... Nsk Ltd

03/15/18 / #20180072343

Steering device

A steering device includes: a variable actuator capable of changing an angle ratio between a steering angle of a steering wheel and a turning angle of a turning wheel; a steering auxiliary mechanism arranged between the variable actuator and the turning wheel to apply steering auxiliary force to a steering mechanism; a torque angle sensor to detect steering torque to be inputted into the steering mechanism. The steering auxiliary mechanism is driven such that the steering auxiliary force in accordance with the steering torque is generated, and, when an avoidance instruction is inputted, an automatic steering control is performed to drive-control the steering auxiliary mechanism so as to run at the turning angle specified by steering position instruction to be inputted. ... Nsk Ltd

03/15/18 / #20180071919

Manipulation system and control method thereof

A manipulation system includes: a manipulator that operates a microscopic object; a first input unit that generates a first movement command signal for moving the manipulator to a manipulator position corresponding to an input operation position; and a second input unit that generates a second movement command signal for moving the manipulator to a manipulator stored position stored in a storage. When the input operation position of the first input unit is a predetermined input operation position, the manipulator is enabled to be moved by an operation of the first input unit, or the manipulator is enabled to be moved by an operation of the second input unit.. ... Nsk Ltd

03/08/18 / #20180066713

Joint for torque transmission and worm reduction gear

Circumferential rigidity of both axial end portions of each coupling-side convex portion is lower than circumferential rigidity of an axially intermediate portion of each coupling-side convex portion. The drive-side concave-convex portion is engaged with a half portion on the other axial side of the coupling-side concave-convex portion. ... Nsk Ltd

03/08/18 / #20180066711

Vehicle wheel-bearing unit

A seal device of a vehicle wheel-bearing unit includes a leak prevention seal lip and a scatter prevention seal lip, wherein a front end part of the leak prevention seal lip is in slidable contact with an axially inboard surface of a rotational-side flange in a state of having an interference throughout an entire circumference, and an axially middle part of the scatter prevention seal lip is provided at a radially more outer position than an indifferentiable part that is present between an axially inboard surface of a thick wall part and an axially inboard surface of a thin wall part and in a state where the axially middle part of the scatter prevention seal lip is radially overlapped with the indifferentiable part.. . ... Nsk Ltd

03/08/18 / #20180066709

Oil supply device and linear motion guide device

An oil supply device provided on a slider main body of a linear motion guide device includes: a storing member; an applicator; and a container. In the container, a storing member accommodation portion and an applicator accommodation portion are provided to be arranged in an up-down direction. ... Nsk Ltd

03/08/18 / #20180066702

Linear guide device

To provide a linear guide device having a higher dustproof performance and a dustproof function with a higher degree of freedom. A linear guide device includes a guide rail, a slider, and a rolling element, a seal member which seals a gap formed between a side surface portion of the guide rail and an inner side surface portion of the slider. ... Nsk Ltd

03/01/18 / #20180056561

Method of manufacturing bearing holder

A bearing holder is to be formed by injecting a melted resin, from a plurality of resin injection gates provided at a peripheral edge portion of a substantially annular cavity formed in a molding die, into the cavity. At least one column portion is provided with a resin reservoir capable of reserving therein the melted resin. ... Nsk Ltd

02/15/18 / #20180045296

Grease application method, application device, and methods for manufacturing worm-type reducer, electric power steering device, automobile and variety of industrial machines

The present invention relates to a grease application device in which a tip-side inclined surface of a nozzle 28 is made to closely face worm wheel teeth 11 of a shaft-mounted worm wheel 9 while rotating the shaft-mounted worm wheel 9 by means of a drive unit 12. At this state, the grease application device is configured to apply liquid grease from a tip-side opening of the nozzle 28 to the worm wheel teeth 11 of the shaft-mounted worm wheel 9 and to apply the grease while pushing the grease into concave portions of the worm wheel teeth 11. ... Nsk Ltd

02/15/18 / #20180043417

Method of manufacuring bearing unit, and rotary press device

A rotary press device (33) includes a restriction section (36) configured to restrict a motion of a roll (30) around a central axis of a roll (30) against movement of the roll (30) around a central axis of a hub main body (8) during rotary forging. In an example, the restriction section (36) has guide teeth (44) meshed with teeth formed on a processing surface of the roll (30).. ... Nsk Ltd

02/08/18 / #20180038772

Abnormality diagnosis system

An abnormality diagnosis system includes a bearing having a plurality of components, a plurality of sensors disposed at different positions of the component and configured to detect surrounding signals, and an abnormality diagnosis device configured to diagnose abnormalities of the rolling bearing and a device disposed around the rolling bearing, based on signals output from the plurality of sensors.. . ... Nsk Ltd

02/08/18 / #20180038414

Bearing with wireless sensor

For the purpose, a physical quantity regarding a bearing body is detected by a detection sensor provided in the bearing body, and detection information of the detection sensor is transmitted by a wireless transmitting unit provided in the bearing body via wireless communication. At this time, the detection information is transmitted at a first transmission interval when the detection information is smaller than a threshold value and is a normal value, and the detection information is transmitted at a second transmission interval that is shorter than the first transmission interval when the detection information is the threshold value or larger and is an abnormal value.. ... Nsk Ltd

02/08/18 / #20180038413

Abnormality diagnosis system

This abnormality diagnosis system is provided with: a bearing comprising a plurality of constituent members; a sensor that is installed on a constituent member and detects signals from the surroundings; and an abnormality diagnosis device that diagnoses, on the basis of signals output from the sensor, abnormalities in the rolling bearing or in a device located at the periphery of the rolling bearing.. . ... Nsk Ltd

02/08/18 / #20180036857

Grinding apparatus, method of manufacturing rolling bearing, method of manufacturing vehicle and method of manufacturing machine

A grinding apparatus includes: a grinding stone in which an outer circumferential surface thereof is pressed against the workpiece while being rotated and driven; and a fluid injection apparatus that has a fluid injection nozzle including an injection port from which a fluid is injected to the outer circumferential surface of the grinding stone, and a grinding oil supply apparatus that supplies a grinding oil to a processing point and that includes a grinding oil supply nozzle separate from the fluid injection nozzle, the processing point being an abutting section of the grinding stone and the workpiece, wherein the injection port is arranged so as to face the outer circumferential surface of the grinding stone in a state capable of injecting the fluid to a position different from the processing point in a radial direction of the grinding stone among the outer circumferential surface of the grinding stone.. . ... Nsk Ltd

02/08/18 / #20180036844

Bearing insertion device

Provided is a bearing insertion apparatus in which a movable carriage is provided on a base placed on a floor surface in a manner of being movable in a horizontal z-axis direction corresponding to a direction in which the movable carriage moves toward or away from a housing. In addition, an apparatus main body for supporting a rolling bearing at a distal end thereof is supported such that the apparatus main body can be freely moved, by a guide mechanism, with respect to the movable carriage in a horizontal x-axis direction orthogonal to the z-axis direction and in a vertical y-axis direction orthogonal to both of the z-axis direction and the x-axis direction.. ... Nsk Ltd

02/08/18 / #20180036759

Nozzle for grease application and methods for manufacturing worm-type reducer, electric power steering device, automobile and variety of industrial machines

A tip end face of a body part 13 is provided at a part in front of a discharge port with respect to a rotational direction of a worm wheel 2 with a protruding part 16, and a tip end face of the protruding part 16 is provided with a grease-pushing surface part 17 configured to push grease into concave portions of a worm wheel teeth 3 while raking and leveling the grease so that the grease is substantially uniform in a width direction and in a circumferential direction of the worm wheel teeth 3. Also, the tip end face of the body part 13 is provided at a rear part of the discharge port with respect to the rotational direction of the worm wheel 2 with a protruding wall part 18 for preventing the grease 1 from moving rearwards with respect to the rotational direction of the worm wheel 2.. ... Nsk Ltd

02/01/18 / #20180029628

Telescopic steering column and steering device

. . A steering column (4a) is configured such that a rear section of an inner column (10a) disposed on a front side of the steering column and a front section of an outer column (11a) disposed on a rear side of the steering column are displaceably set with respect to each other in an axial direction so that a total length of the steering column can be extended and contracted. A roller (70) is rotatably supported on a lower portion of a front end section of the outer column (11a) by a shoulder bolt (56) disposed in a width direction. ... Nsk Ltd

02/01/18 / #20180029627

Steering device

A steering device includes a steering column (4a), a support bracket (17a) attachable to a vehicle body to support the steering column, and a tightening mechanism (80). The steering column includes an outer column (11a) and an inner column (10a) partially enclosed by the outer column (11a). ... Nsk Ltd

01/25/18 / #20180023621

Anti-friction bearing

In an angular ball bearing, an outer ring is provided with a plurality of oil holes. The circumferential phases of the plurality of oil holes are θ≧45°, when the angular rolling bearing is viewed in the axial direction during rotation of the bearing, when the center of a ball passes through the center line of one oil hole, the ball closest to the remaining oil hole is located at a position which intersects with the center line of the other oil hole, and when an angle formed by a straight line passing through the center of the ball closest to the oil hole and perpendicular to the radial direction of the angular ball bearing, and a tangent at a contact point between the center line of the oil hole and the ball is set as (θ) when the angular rolling bearing is viewed from the axial direction.. ... Nsk Ltd

01/25/18 / #20180022377

Electric power steering apparatus and control apparatus determining parameter set to the same

An electric power steering apparatus that achieves a desired steering characteristic in minutely steering at on-center, suppresses frictional feeling, and improves linear steering feeling at on-center, and a control apparatus that determines a parameter. The apparatus calculates a current command value by using an assist map related to a steering torque and a vehicle speed, drives a motor based on the current command value, and assists and controls a steering system.. ... Nsk Ltd

01/25/18 / #20180022376

Telescopic steering device

A tilt spring (72) is provided in a state being bridged between an upper bracket (17a) and an adjusting rod (24a). An upward biasing force is exerted on the adjusting rod (24a). ... Nsk Ltd

01/25/18 / #20180022375

Steering device

A pair of clamp parts (38 and 38) are provided on both sides of a front end portion of an outer column (11a) in a width direction and enclosed in three directions by slit portions. The clamp parts bent when an interval of inside surfaces of a pair of support plate units constituting an upper bracket is reduced so as to elastically sandwich an outer peripheral surface of an inner column (10a). ... Nsk Ltd

01/25/18 / #20180021907

Spindle device and machine tool

A cooling gas is fed from an ejection nozzle into the interior of a through-hole which is formed in a radially central portion of a main spindle, and which penetrates through said main spindle in an axial direction. The cooling gas passes through radial venting holes provided in a plurality of locations, in the circumferential direction, in an axially intermediate portion of the main spindle, is fed into axial venting holes provided in a plurality of locations, in the circumferential direction, extending from one axial-direction end of the main spindle to an intermediate portion thereof, is caused to flow through the axial venting holes, and is discharged from discharge holes.. ... Nsk Ltd

01/18/18 / #20180019529

Connector

A connector housing includes a hole having a minimum size that a lead section of a connector terminal to penetrate, and a guide wall which is formed along an outer peripheral of the hole, and is protruded in a direction which a lead section protrudes from the connector housing to a bending section of the lead section, wherein, by which inner walls of the guide wall is mutually and directly in contact with side surfaces of the lead section over a height near a top end side of the lead section in a bending section of the lead section from an outer peripheral of the hole, a sealing structure is formed from the bending section of the lead section to an interior of the connector housing.. . ... Nsk Ltd

01/11/18 / #20180009472

Steering holding judging apparatus for vehicle and electric power steering apparatus equipped with the same

A steering holding judging apparatus for the vehicle including: at least two steering angle sensors to detect a steering angle; and a steering state judging section to calculate a hysteresis central value by using a hysteresis signal that sets a hysteresis width to the two steering angle sensor, judge a steering state using the hysteresis central value, and output provisional steering information, wherein a steering holding state is detected based on the provisional steering information, and the electric power steering apparatus equipped with the steering holding judging apparatus for the vehicle.. . ... Nsk Ltd

01/11/18 / #20180009437

Electric power steering device

An electric power steering device includes: a steering torque sensor that detects a steering torque; a current command value calculation unit that calculates a current command value based on the steering torque; an electric motor that generates a steering assist torque; a motor control unit that controls and drives the electric motor based on the current command value; a navigation controller and a gps receiver that detects position information of a vehicle; and an operation assist unit that stores, in a map database, the steering torque detected by the steering torque sensor and the position information of the vehicle upon detection of the steering torque in association with each other and executes operation assist processing for assisting the driver in operating the steering wheel based on a past steering torque corresponding to current position information.. . ... Nsk Ltd

01/04/18 / #20180003238

Bearing cap having sensor unit, and rolling bearing unit

A holder support part, into which a holder main body part constituting a sensor holder is fitted, is provided to an upper position of two vertically adjacent positions of an axially inboard-side surface of a bottom plate part so as to project. A nut holding part, which holds a nut, into which is threaded a bolt for joining a sensor holder, is provided to a lower position of the two vertically adjacent positions. ... Nsk Ltd

01/04/18 / #20180001845

Steering apparatus

A steering apparatus (2, 202) of the invention of the present application is disclosed, which includes an electrifying plate (40, 240) secured to an inner column (11, 211) and received within a guide groove (25, 225) of an outer column (10, 210). The electrifying plate contacts an electrifying cover (15, 215) of the outer column, and configures part of an electrifying path leading to the outer column from the inner column. ... Nsk Ltd

12/28/17 / #20170373451

Terminal connection structure for electricpower steering system of a vehicle

A terminal connection structure includes a first terminal, a second terminal, and a terminal guide. The first terminal includes a held portion. ... Nsk Ltd

12/28/17 / #20170369094

Motor control device, electric power steering device, and vehicle

There are provided a motor control device, an electric power steering device, and a vehicle that allow an electric motor to be accurately drive-controlled even when a failure occurs in a motor electric angle detection unit that detects a motor electric angle. When at least one of a resolver and an angle computation unit is diagnosed as being abnormal in an initial diagnosis after a system restart, a motor electric angle initial value is estimated on a basis of a response output of a three-phase electric motor in response to input of a motor drive signal to the three-phase electric motor, a motor electric angle estimation vale is calculated on a basis of an output shaft rotation angle detection value detected by an output-side rotation angle sensor and a relative offset amount estimated on a basis of the estimated motor electric angle initial value, and the three-phase electric motor is drive-controlled on a basis of the calculated motor electric angle estimation value.. ... Nsk Ltd

12/21/17 / #20170363148

Ball bearing assembly method and assembly device, and ball bearing produced using said assembly method

. . A ball bearing assembly device includes: an inner and outer ring holding unit which holds an outer ring and inner ring in a state where an outer ring raceway surface and inner ring raceway surface are eccentric to each other on a same plane so as to form a gap space; a stocker; a robot arm; a ball holding mechanism which is disposed at a tip of the robot arm; and a control unit. The control unit controls the ball holding mechanism to hold any ball from the stocker, controls the robot art to transport the held ball to a ball insertion position in the gap space corresponding to a kind of ball bearing, and inserts the held ball into the gap space, which are repeated by the number of balls of the ball bearing.. ... Nsk Ltd

12/21/17 / #20170363146

Tapered roller bearing

A tapered roller bearing (1) is includes an outer ring (2) having an outer ring raceway surface (2a) on the inner peripheral surface thereof, an inner ring (3) having an inner ring raceway surface (3a) on the outer peripheral surface thereof, and a plurality of tapered rollers (4) arranged in a rollable manner between the outer ring raceway surface (2a) and the inner ring raceway surface (3a). A large flange (3b) is formed on an end portion of the inner ring (3) on a large-diameter side of the inner ring, and the inner ring raceway surface (3a) continuously extends to the end face (3c) of the inner ring (3) on a small-diameter side of the inner ring. ... Nsk Ltd

12/21/17 / #20170362530

Grease composition for lubricating resins and electric power steering device

The invention provides a grease composition for lubricating resins which contains a base oil, a diurea compound represented by formula (i) as a thickener: r1—nhconh —r2—nhconh—r3 (i) (wherein r2 represents a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and r1 and r3 each independently represent a straight-chain or branched alkyl group having 8 to 22 carbon atoms), and a chained hydrocarbon polymer having a weight-average molecular weight of 20,000 to 300,000.. . ... Nsk Ltd

12/14/17 / #20170356075

Insulated bearing and bearing coating method

An insulated bearing includes an outer ring, an inner ring, and a plurality of rolling elements. At least one of the outer ring and an inner ring is made of metal, the plurality of rolling elements are provided between the outer ring and the inner ring, so as to be freely rolled, and at least one of the outer ring and an inner ring is coated with an insulating layer. ... Nsk Ltd

12/14/17 / #20170355393

Steering device

Construction is achieved of a steering device that is capable of preventing impact going forward from being applied to a support bracket even when a steering wheel is vigorously displaced to a front-end position when adjusting the forward-backward position of the steering wheel. Part of the stopper member 28 is supported by a fastening member such as a housing 10a. ... Nsk Ltd

12/07/17 / #20170349208

Electric power steering apparatus

An electric power steering apparatus includes: a current command value determining section that determines a current command value based on steering torque and vehicle speed; a vibration extracting filter that extracts a first vibration component having a predetermined amplitude and first predetermined frequency range depending on motor angular velocity; a vibration extracting section that extracts a second vibration component having a second predetermined frequency range depending on motor angular acceleration; a first compensation value calculating section that calculates a first vibration suppression compensation value based on the first vibration component extracted by the vibration extracting filter; and a second compensation value calculating section that calculates a second vibration suppression compensation value based on the second vibration component; and suppresses vibrations of the motor by feeding back the first vibration suppression compensation value and the second vibration suppression compensation value calculated to the current command value.. . ... Nsk Ltd

12/07/17 / #20170348069

Bearing unit for air turbine

When compressed air does not act, a seal member is in contact with an outer periphery of an inner ring. When the compressed air acts, a contact area between the seal member and the outer periphery of the inner ring is reduced, as compared to when the compressed air does not act. ... Nsk Ltd

11/30/17 / #20170343451

Abnormality diagnosis device, bearing, rotation device, industrial machine and vehicle

There is provided an abnormality diagnosis device, a bearing, a rotation device, an industrial machine, and a vehicle, which are able to discover abnormality early and also set a diagnosis threshold relatively easily. A differential value between an initial frequency component and an actual measurement frequency component is calculated, the differential value is compared to the diagnosis threshold, and abnormality diagnosis for an abnormality diagnosis target is carried out based on the comparison result, where the initial frequency component is a feature frequency component of abnormality of the abnormality diagnosis target in the rotation device, which is extracted from an initial vibration value measured at initial measurement timing while the axle is rotating at setting rotation speed during an operation of the rotation device, and the actual measurement frequency component is a feature frequency component extracted from an actual measurement vibration value measured at actual measurement timing that is the initial measurement timing or later while the axle is rotating at the setting rotation speed during the operation of the rotation device.. ... Nsk Ltd

11/23/17 / #20170335891

Friction roller speed increaser

. . . . . . A friction roller type speed increaser (100) includes a high speed side shaft (11), a ring roller (21), a low speed side shaft (13), at least one fixed roller (15), at least one movable roller, and a housing (23) that surrounds the rollers. A bearing unit (45) that includes a cylindrical bearing housing (51) into which the high speed side shaft (11) is inserted, bearings (53 and 55) on an inner circumferential portion of the bearing housing (51) which rotatably support the high speed side shaft (11), an oil seal (59) which is provided at one end portion of the bearing housing (51) and closes an inner space including the bearings is floating-supported such that the bearing unit can move in a radial direction of the high speed side shaft (11) in a unit accommodating section (47) formed in the housing (23).. ... Nsk Ltd

11/16/17 / #20170331343

Motor, actuator, semiconductor manufacturing apparatus, and flat display manufacturing apparatus

. . Provided is a motor capable of more reliably preventing dust generated therein from flowing to the outside. A motor includes a stator, a rotor, a rotor housing which rotates along with the rotor, a stator housing which fixes the stator thereto, includes spaces formed with respect to the rotor housing, and overlaps the rotor housing with first gaps interposed therebetween in the entire circumferential direction, annular members which overlap the stator housing with second gaps interposed therebetween in the entire circumferential direction inside the spaces, exhaust holes which suck and discharge air inside the spaces through the second gaps, and exhaust grooves.. ... Nsk Ltd

11/16/17 / #20170328462

Electric power steering device

An electric power steering device includes a composite metal member. The composite metal member is formed by laminating a plurality of metal plates that have different thermal expansion coefficients. ... Nsk Ltd

11/16/17 / #20170327145

Electric power steering apparatus

An electric power steering apparatus that calculates a first current command value based on at least a steering torque and performs an assist-control of a steering system by driving a motor based on the first current command value, including: a configuration of a model following control including a viscoelastic model as a reference model within a predetermined angle at front of a rack end, wherein an offset is given to input or output of the viscoelastic model for preventing an overheat, resulting in suppressing a rack end hitting.. . ... Nsk Ltd

10/26/17 / #20170309556

Electronic part mounting heat-dissipating substrate

. . An electronic heat-dissipating substrate including: lead frames of wiring pattern shapes on a conductor plate; and an insulating member between the lead frames. A plate surface of the lead frames and a top surface of the insulating member form one continuous surface. ... Nsk Ltd

10/26/17 / #20170305459

Electric power steering apparatus

An electric power steering apparatus including a torque sensor to detect a steering torque and a motor control unit to control a motor that applies an assist torque to a steering system of a vehicle, including: a function to switch a control system of the motor between a torque control system to control a motor output torque and a position/speed control system to control a steering angle of a steering in accordance with a predetermined switching trigger. The fade processing time from the torque control system to the position/speed control system and the fade processing time from the position/speed control system to the torque control system are individually set.. ... Nsk Ltd

10/26/17 / #20170305455

Electric power steering apparatus

An electric power steering apparatus that performs an assist control of a steering system, including: at least two respectively independent torque sensors and angle sensors, wherein having a function that respectively calculates steering angles from the torque sensors and the angle sensors to utilize, wherein comparison diagnoses of independent signals are performed and also concurrently individual diagnoses of each individual signal are performed, in a case that it is judged that there is an abnormality in the comparison diagnoses, the angle sensor signals are not used, in a case that it is judged that at least one of the individual diagnoses is abnormal, the angle sensor signal is treated as downgrading, and in a case that it is judged that two or more of the individual diagnoses are abnormal, the angle sensor signals are not used.. . ... Nsk Ltd

10/12/17 / #20170294374

Electronic part mounting heat-dissipating substrate

An electronic part mounting heat-dissipating substrate which includes: a conductor plate which is formed on lead frames of wiring pattern shapes; and an insulating member which is provided between the lead frames of the wiring pattern shapes on the conductor plate; wherein a plate surface of a part arrangement surface of the conductor plate and a top surface of the insulating member at a side of the part arrangement surface form one continuous surface, wherein a plate surface of a back surface of the part arrangement surface of the conductor plate and a top surface of the insulating member at a side of the back surface at the part arrangement surface-side are formed in an identical plane, wherein the substrate is formed in a circular shape. . ... Nsk Ltd

10/05/17 / #20170284532

Worm reducer and method of assembling worm reducer

There is provided a method of assembling a worm reducer, which includes causing a worm wheel to be rotatably supported in a wheel accommodation part, externally fitting a pair of bearings at tip-side and base-side positions of a worm, inserting the worm into a worm accommodation part from an opening side thereof at a state where the worm is offset outward in a radial direction of the worm wheel with respect to a center axis of the worm accommodation part, causing the bearing which is externally fitted to a leading side in an insertion direction of the worm to pass an outer diameter-side of a part of an outer peripheral edge of the worm wheel, which protrudes most into the worm accommodation part, causing the worm teeth to mesh with the worm wheel, and further inserting the worm to a predetermined position in the worm accommodation part.. . ... Nsk Ltd

10/05/17 / #20170282966

Electric power steering apparatus

An electric power steering apparatus that driving-controls a motor via inverters based on a current command value, and applies an assist force by the motor to a steering system, includes multi-system driving systems with the inverters for respective system-windings of the motor which is a multi-system motor, wherein respective multi-system current command value characteristics against a steering torque are applied so as to be disproportionate for left and right steering, to the respective multi-system driving systems, and an assist-control is performed in response to the individual current command value characteristics.. . ... Nsk Ltd

09/28/17 / #20170279394

Motor control apparatus and electric power steering apparatus using the same

. . A motor control apparatus that calculates duty command values of respective phases for controlling currents of a motor by means of a control calculation, forms pwm-signals in correspondence to the duty command values, drives the motor by means of an inverter based on the pwm-signals, and which is provided a rotation sensor to detect a motor angle of the motor.. . ... Nsk Ltd

09/28/17 / #20170274443

Method for manufacturing ring-shaped member and manufacturing apparatus for same

Construction is achieved that, together with preventing the occurrence of damage to a mandrel, is able to improve precision of the shape of a ring-shaped member after processing. A mandrel includes a pair of support shaft sections that are provided so as to be separated in the axial direction and so as to be concentric with each other, and a rolling shaft section that is concentrically provided in the axial direction between the pair of support shaft sections. ... Nsk Ltd

09/21/17 / #20170267278

Electric power steering apparatus

An electric power steering apparatus that calculates a current command value based on at least a steering torque, performs a pwm-control of a brushless motor by an inverter based on the current command value, performs a current control by detecting a rotational angle of the brushless motor, and performs an assist-control of a steering system. The apparatus includes three rotational angle detecting systems to detect three rotational angles of the brushless motor; and an angle diagnosing section that compares absolute values of differences on respective angles outputted from the three rotational angle detecting systems with a threshold, and performs a process by diagnosing whether the rotational angle detecting systems are normal or abnormal; wherein the assist control is continuously performed by using output angles outputted from systems diagnosed as being normal.. ... Nsk Ltd

09/07/17 / #20170254678

Sensor and method of manufacturing sensor

A sensor including: a generating unit; a detecting unit that detects the object to be detected generated by the generating unit; and a substrate at which the generating unit and the detecting unit are provided. The substrate is a flexible substrate that includes a first portion provided with the generating unit and a second portion provided with the detecting unit, the first portion and the second portion being integrated, and that takes a curved shape or a bent shape in which a surface of the first portion at which the generating unit is provided and a surface of the second portion at which the detecting unit is provided face each other. ... Nsk Ltd

09/07/17 / #20170254363

Bearing device and method for manufacturing bearing device

An outer ring (31) has a small-diameter step portion (37) comprising a step portion outer peripheral surface (37a) and a step surface (37b), and a engagement groove (37c) is formed in the step portion outer peripheral surface (37a). The inner peripheral surface of a retainer plate (40) is provided with a small-diameter hole portion (41) facing the step portion outer peripheral surface (37a), and a large-diameter hole portion (42) facing the outer peripheral surface (31a) of the outer ring (31) and guiding a rolling bearing (30). ... Nsk Ltd

09/07/17 / #20170253264

Electric power steering device and method for assembling the same

An axially intermediate portion of a spring shaft portion 36 of a torsion bar 14a is provided with a large diameter portion 37, and an outer peripheral surface of the large diameter portion 37 is in contact with or is positioned close to an inner peripheral surface of a hollow output shaft 13a. Accordingly, in an electric power steering device, when one of a pair of coupling shaft portions, which are axially end portions of the torsion bar, to be coupled to a coupling hole of a counter-shaft later is press-fitted into the coupling hole of the counter-shaft, the spring shaft portion of the torsion bar can be prevented from buckling.. ... Nsk Ltd

08/24/17 / #20170240198

Cam device, position-adjusting device for steering wheel, and method for assembling position-adjusting device for steering wheel

Construction is achieved that makes it possible to easily determine whether or not a combination of a drive-side cam and driven-side cam is suitable. Driven-side concave grooves 47 that are depressed inward in the radial direction and extend along the axial direction are formed in the outer-circumferential surface of the driven-side cam 30a at two locations on opposite sides in the radial direction. ... Nsk Ltd

08/10/17 / #20170228750

Server and price setting support method

. . A server includes: a receiver configured to receive information transmitted from a terminal; a storage capable of storing first information related to a price of a product or service and second information related to intellectual property of a product or service; a processor configured to identify third information using the information received by the receiver and indicating a specific product or service and using the first information, the third information related to a price of the specific product or service, identify fourth information using the information indicating the specific product or service and using the second information, the fourth information related to intellectual property of the specific product or service, and calculate a price of the specific product or service using the third information; and a transmitter capable of transmitting the calculated price and transmission information including the fourth information to the terminal.. . ... Nsk Ltd

08/10/17 / #20170227111

Rotation transmission device

A rotation transmission device having a high torque measurement resolution is provided. The rotation transmission device is provided with: a rotary-shaft unit (6) having a first and second rotary shaft (13, 14) combined so as to be coaxial and such that the end sections thereof can rotate relative to each other and a torsion bar (15) that is provided on the inner-diameter side of the first and second rotary shafts so as to be coaxial therewith, has one end section connected to the first rotary shaft (13), and has the other end section connected to the second rotary shaft (14); a first gear (7) fastened to the outer peripheral surface of the first rotary shaft (13); a second gear (8) fastened to the outer peripheral surface of the second rotary shaft (14); a coupling shaft (9) provided on the inner-diameter side of the torsion bar (15) so as to be coaxial therewith, having one end section connected to one rotary shaft (13), and having the other end section protruding from an end of the torsion bar (15) in the axial direction; a first encoder disposed and fixed on the other end of the coupling shaft (9) so as to be coaxial with the first rotary shaft (13) and having a first detected section (39); a second encoder fastened on the other end of the second rotary shaft (14) so as to be close to the first encoder and having a second detected section (40); and a sensor unit having at least one sensor (42a, 42b) that faces the first and second detected sections (39, 40).. ... Nsk Ltd

08/10/17 / #20170227052

Resin cage for tapered roller bearing and tapered roller bearing including the resin cage

Provided is a resin cage for a tapered roller bearing in which a mold parting line which is extended in an axial direction is formed in a pillar portion defining a pocket. On facing surfaces of adjacent pillar portions, on an outer diameter side from the mold parting line, a first conical surface which slides in contact with an outer peripheral surface of a tapered roller is formed, and a first flat surface in a radial direction is formed in a portion on the outer diameter side from the first conical surface. ... Nsk Ltd

08/03/17 / #20170219389

Sensor and method of manufacturing sensor

A sensor including a generating unit; a detecting unit; a substrate; a member that exerts influence on an object to be detected; and a housing that includes a first housing that operably supports the member and a second housing to which a part of the substrate is fixed. The substrate includes a first portion provided with the generating unit and a second portion provided with the detecting unit that are integrated, and has a curved shape or a bent shape in which a surface of the first portion at which the generating unit is provided and a surface of the second portion at which the detecting unit is provided face each other. ... Nsk Ltd

08/03/17 / #20170219388

Optical sensor

An optical sensor including a light-emitting element, four light-receiving elements facing the light-emitting element, and a substrate at which the light-emitting element and the light-receiving elements are provided. The substrate includes a first portion at which the light-emitting element is provided and a second portion at which the light-receiving elements are provided, the first portion and the second portion being integrated. ... Nsk Ltd

08/03/17 / #20170217485

Method for controlling electric power steering apparatus, electric power steering apparatus and vehicle equipped with the same

A method for controlling an electric power steering apparatus, the electric power steering apparatus and a vehicle equipped with the same. The method includes detecting an upper-side angle of a torsion bar; detecting a lower-side angle; setting an angle target value of an opposite side by using one of the upper-side angle or the lower-side angle; detecting an actual angle of the opposite side; and performing an angle follow-up feedback control based on a deviation between the angle target value and the actual angle.. ... Nsk Ltd

08/03/17 / #20170217479

Electric power steering apparatus

An electric power steering apparatus that enables implementation of a desired steering torque without being affected by a state of a road surface by controlling a steering torque so as to become a value corresponding a steering angle and a steering angular velocity. The apparatus includes a sat compensation value calculating section that calculates a sat compensation value based on a sat value; and a steering reaction compensation value calculating section that calculates a steering reaction compensation value based on the sat compensation value, a steering angle and a steering angular velocity, and corrects the current command value by the steering reaction compensation value. ... Nsk Ltd

08/03/17 / #20170217474

Rack and pinion steering gear unit

Construction is achieved that is able to effectively prevent the displacement in the axial direction of a ball bearing 16 that supports the middle section of a pinion shaft 6 so as to be able to rotate freely, and that is compact and low cost. A fastening groove 28b is formed around the entire circumference of a portion near an opening of the inner circumferential surface of a sub housing section 12c of a casing 10c, and a radially outside portion of a c-shaped retaining ring 29b is fastened in this fastening groove 28b. ... Nsk Ltd

07/27/17 / #20170211621

Thrust bearing and manufacturing method for same

A thrust bearing includes: a retainer that is provided with a plurality of pockets; a plurality of rollers that are arranged so as to freely rotate inside the plurality of pockets; and at least one first race that has an annular-shaped first race section in which the plurality of rollers move. The first race is provided with a hook curl section that is formed by bending the first race section from an outer-diameter-side periphery thereof toward the inner-diameter side obliquely in the radial direction, and an outer peripheral surface of the retainer has a conical surface that is formed so as to be substantially parallel to an inner peripheral surface of the hook curl section. ... Nsk Ltd

07/27/17 / #20170210416

Torque detection device, electric power steering device, and vehicle

To provide a torque detection device which allows less deformation of detection coils than in the conventional techniques in axially pressing and holding in yokes, coil bobbins around which the detection coils are wound. A torque sensor includes a pair of coils, coil bobbins around which the coils are respectively wound, yokes which respectively hold the coil bobbins, one yoke cover fitted by pressing into inner diameters of the yokes, and pressing portions which are formed to project radially and outward at a plurality of circumferential positions of a radial outer end portion of respective flange portions of the coil bobbins, and act between the coil bobbins to axially press the coil bobbins during assembly.. ... Nsk Ltd

07/27/17 / #20170210412

Electrically driven power steering device

An electric power steering device includes a housing, a rotating shaft for steering, a worm wheel, a worm shaft, a tip side bearing, an electric motor, and biasing mechanism. The biasing mechanism includes a wedge piece and an elastic member for a wedge piece. ... Nsk Ltd

07/27/17 / #20170209914

Method for manufacturing rolling bearing unit

Construction is achieved that is capable of preventing the formation of radial streaks in the tip-end surfaces of teeth of hub-side face splines 21. When a swing center distance is taken to be l, a swing angle that is the inclination angle of the center axis of a roll 30 with respect to a main hub body 8 is taken to be θ, the pitch diameter of the hub-side face splines 21 is taken to be dh, the number of teeth of the hub-side face splines 21 is taken to be nh, and the number of teeth of a processing surface 31 of the roll 30 is taken to be nr, the position relationship of the main hub body 8 and the roll 30, or in other words, at least one of the swing center distance l, the swing angle θ, and the pitch circle diameter dh is regulated so that the relationship nh/nr=cos θ+(2l/dh)·sin θ is satisfied.. ... Nsk Ltd

07/20/17 / #20170208687

Multipolar lead parts and board coupling device

Multipolar lead parts having plural leads and a retaining member, wherein the retaining member includes a cylindrical portion so as to cover peripheries of the leads, the cylindrical portion facing in a board direction; wherein the leads each include an upper-side board coupling portion and a lower-side board coupling portion; wherein the lower-side board coupling portion comprises a forward protruding portion that the other end side of each of the leads is bent in a direction orthogonal to an arrangement face of the leads, a vertical portion extending downward from a front end, a solder coupling portion extending backward from a lower end, and a rising portion extending upward from the solder coupling portion; and wherein a bending angle of the rising portion with respect to the solder coupling portion is formed so as to be substantially identical to a bending angle of the vertical portion with respect to the solder coupling portion.. . ... Nsk Ltd

07/20/17 / #20170204911

Bearing device and beading device fixing plate

A fixing plate (40) is provided with through holes (45) for reducing the rigidity of the fixing plate (40) between a latch hole (41) and boss parts (42), the through holes being disposed between the latch hole (41) and the boss parts (42) and radially outward from the outer circumferential surface of an outer ring (31).. . ... Nsk Ltd

07/20/17 / #20170204907

Bearing-equipped resin pulley

A bearing-equipped resin pulley is equipped with a metal ring-shaped member (21) having an overall circular shape and pressed into the outer-diameter surface (3c) of an outer race (3), and has a resin pulley (15) integrally formed around the metal ring-shaped member (21). The metal ring-shaped member (21) comprises a cylindrical engaging part (23) for engaging the outer-diameter surface (3c) of the outer race (3) by being pressed therein, and a disc part (29) integrally formed in an upright manner in the perpendicular direction from the engaging part (23). ... Nsk Ltd

07/20/17 / #20170204906

Tapered roller bearing

A tapered roller bearing (1) is includes an outer ring (2) having an outer ring raceway surface (2a) on the inner peripheral surface thereof, an inner ring (3) having an inner ring raceway surface (3a) on the outer peripheral surface thereof, and a plurality of tapered rollers (4) arranged in a rollable manner between the outer ring raceway surface (2a) and the inner ring raceway surface (3a). A large flange (3b) is formed on an end portion of the inner ring (3) on a large-diameter side of the inner ring, and the inner ring raceway surface (3a) continuously extends to the end face (3c) of the inner ring (3) on a small-diameter side of the inner ring. ... Nsk Ltd

07/13/17 / #20170197655

Control apparatus and control method of on-vehicle electronic equipment

An apparatus and a method that includes a program execution monitoring dedicated circuit connected to a cpu of a control apparatus of an on-vehicle electronic equipment that includes an execution time monitoring timer circuit (111), an execution sequence monitoring comparison circuit (113), a setting register (115), an attached circuit (117), perform monitoring of an execution sequence of a task executed by a control program of the on-vehicle electronic equipment and/or an execution time of the task executed by the control program, and enabled to continue the control of the on-vehicle electronic equipment such as an electric power steering apparatus by performing an alternative processing in the case of detecting an abnormality in the execution sequence and/or the execution time.. . ... Nsk Ltd

07/06/17 / #20170191552

Friction roller-type transmission

A sun roller of a friction roller-type transmission includes a movable sun roller element (23) capable of moving in an axial direction. Furthermore, the sun roller is provided with a loading cam mechanism which is formed along the circumferential direction of an input shaft (12), the loading cam mechanism having a first cam surface (75), a second cam surface (77) arranged facing the first cam surface (75) and secured to the input shaft (12), rolling elements (63) held between the first and second cam surfaces (75, 77), and an annular holding device (51), and the loading cam mechanism axially displacing the movable sun roller element (23). ... Nsk Ltd

07/06/17 / #20170190358

Control apparatus and control method of on-vehicle electronic equipment

An apparatus and a method that includes a program execution monitoring dedicated circuit connected to a cpu of a control apparatus of an on-vehicle electronic equipment that includes an execution time monitoring timer circuit, an execution sequence monitoring comparison circuit, a setting register, and an other attached circuit, perform monitoring of an execution sequence of a task executed by a control program of the on-vehicle electronic equipment and/or an execution time of the task executed by the control program, stop monitoring the execution time of the task when a priority interruption occurs, and enable the control of the on-vehicle electronic equipment such as an electric power steering apparatus to be continued by performing an alternative processing in the case of detecting an abnormality in the execution sequence and/or the execution time.. . ... Nsk Ltd

07/06/17 / #20170190357

Control apparatus and control method of on-vehicle electronic equipment

A control apparatus of on-vehicle electronic equipment that monitors an execution time of each normal processing obtained by subdividing a control program of the on-vehicle electronic equipment using an mcu which is provided in the control apparatus, wherein in a case that an abnormality in the execution time of the normal processing is detected by a timer interruption processing based on a general-purpose timer built in the mcu and software, an alternative processing to be paired with the normal processing is performed to continue a control of the on-vehicle electronic equipment by replacing the normal processing with the alternative processing in a next period.. . ... Nsk Ltd

06/29/17 / #20170183028

Electric power steering apparatus

. . An electric power steering apparatus including a steering wheel return control section that calculates a steering wheel return control current by a steering angle, the steering torque, the vehicle speed and a steering angle velocity, and drives the motor by a compensation current command value made by adding the steering wheel return control current to the current command value.. . ... Nsk Ltd

06/22/17 / #20170175821

Torque transmission joint and electric power steering device

A driving-side transmission portion of an output shaft of an electric motor and a driven-side transmission portion of a worm shaft are coupled to each other via a torque transmission joint including an elastic member and a coupling such that the torque can be transmitted. One axial end portion of a coupling-side concave-convex portion of the coupling is engaged with a first driving-side concave-convex portion of the driving-side transmission portion with a gap in the circumferential direction, and the other axial end portion thereof is engaged with a first driven-side concave-convex portion of the driven-side transmission portion with a gap in the circumferential direction. ... Nsk Ltd

06/22/17 / #20170174250

Torque transmission joint and electric power steering system

A torque transmission joint transmits torque between a drive shaft and a driven shaft. The torque transmission joint includes: a coupling including: a first concave-convex portion which is provided on one of inner and outer circumferential surfaces thereof and is engaged with a drive-side concave-convex portion of the drive shaft with a gap; and a second concave-convex portion which is provided on the other of the inner and outer circumferential surfaces and is engaged with a driven-side concave-convex portion of the driven shaft with a gap; a drive-side elastic member which is provided between the drive shaft and the coupling to be torque-transmittable; and a driven-side elastic member which is provided between the coupling and the driven shaft to be torque-transmittable. ... Nsk Ltd

06/22/17 / #20170173658

Method for manufacturing ring-shaped member

There is provided a method for manufacturing ring-shaped members at a good yield and high production efficiency. To achieve this object, the following is performed. ... Nsk Ltd

06/15/17 / #20170166243

Electric power steering apparatus

An electric power steering apparatus that improves an on-center feeling while improving vehicle response by increasing a steering assist current in a torque range where a steering torque is equal to or less than a static friction torque of a reduction mechanism mainly so as to reduce a static friction uncomfortable feeling in the vicinity of on-center. The apparatus drive-controls a motor for providing a steering mechanism with a steering assist force using a current command value calculated based on at least a steering torque. ... Nsk Ltd

06/15/17 / #20170165798

Assembling device of wheel hub unit

An assembling device including: a bearing setting unit configured to set a bearing unit such that the bearing unit is coaxial with respect to a hub cylindrical part and can be moved toward the hub cylindrical part, a rotational drive source configured to transmit rotational force around an axis to the bearing unit set in the bearing setting unit; and an inner-ring press-fitting unit configured to externally fit inner rings of the bearing unit to which the rotational force around the axis has been transmitted, to the hub cylindrical part.. . ... Nsk Ltd

06/08/17 / #20170159711

Linear motion guide device

There is provided a linear motion guide device that is reduced in a contact surface pressure between a ball and a raceway groove so that an occurrence of an edge load can hardly occur, even when any of a pressing load, a tensile load, and a lateral load is applied to a slider. Upper flanks and lower flanks included in raceway grooves of a guide rail and a slider each include: a main arc portion having an arc-shaped section and placed generally in a center of the flank in a width direction; a groove shoulder side sub-arc portion having an arc-shaped section and formed continuously from a groove shoulder side of the main arc portion; and a groove bottom side sub-arc portion having an arc sectional shape and formed continuously from a groove bottom side of the main arc portion. ... Nsk Ltd

05/11/17 / #20170130768

Load sensor-equipped bearing device

. . . . A bearing raceway ring (25) disposed near a mounting section (9) is disposed on the outer periphery of a circular cylinder section (19). A fluid-sealed chamber (40) in which a measurement liquid is hermetically enclosed is provided between a first member (8) and the bearing raceway ring (25) which is disposed near the mounting section (9). ... Nsk Ltd

05/04/17 / #20170120404

Workpiece auto-centering apparatus and auto-centering method

. . An air bearing slide (20) arranged on a rotational table (11) includes a movable table (40) that has a workpiece placement surface (42a) and that floats due to pressure of compression air to be movable horizontally in any direction. A workpiece auto-centering apparatus includes: a plurality of stopper apparatuses (30) that include an abutment portion (31a) against which a workpiece w can abut to center the workpiece w, and a pressing apparatus that presses the workpiece (w) such that the workpiece (w) abuts against the abutment portion (31a) of the stopper apparatuses (30). ... Nsk Ltd

04/27/17 / #20170117833

Motor control unit and electric power steering apparatus using the same and vehicle

A motor control unit that does not make an occurrence of a noisy sound and a vibration and does not give a steering discomfort by changing parameters of a current feedback control section even if an electric characteristic of the motor varies with a system-switching due to a failure occurrence, and to an electric power steering apparatus using the same and a vehicle. The motor control unit controls a motor having multi-system motor windings by means of a 3-phase current feedback system provided with a current control section through a motor driving circuit of each winding system, having a function that changes by switching parameters of the current control section corresponding to a driving system number of the multi-system motor windings.. ... Nsk Ltd

04/27/17 / #20170114829

Bearing device and method for manufacturing bearing device

An outer peripheral surface of the small-diameter step portion is formed with an engagement groove extending in a circumferential direction. The retainer plate has a plurality of engagement claws protruding radially inward from an inner periphery of the retainer plate defining the fitting hole and configured to be engaged to the engagement groove. ... Nsk Ltd

04/20/17 / #20170111003

Motor, electric power steering device, and vehicle

. . A motor includes an annular stator core including teeth arranged side by side in a circumferential direction on an inner circumferential surface of a back yoke. The motor includes 3n (n is an integer) first coil groups arranged in the circumferential direction at regular intervals, each of the first coil groups being constituted of first coils that are respectively wound, in a concentrated manner, around the teeth arranged adjacent to one another, and that are excited by a first inverter, and also includes 3n second coil groups arranged in the circumferential direction at regular intervals, each of the second coil groups being constituted of second coils that are respectively wound, in a concentrated manner, around the teeth arranged adjacent to one another in positions different from positions of the teeth around which the first coils are wound in a concentrated manner, and that are excited by a second inverter.. ... Nsk Ltd

04/20/17 / #20170108049

Rolling bearing unit with rotational speed detecting device

There is provided a structure capable of sufficiently securing sealing performance by a cap (19a). In a state where a fitting insert (44) formed of a nonmagnetic material having a bottomed cylindrical shape is fixed to an inner diameter side of a cap cylindrical part (22a) constituting a cap body (20a) formed of a synthetic resin having a bottomed cylindrical shape, an axially outboard end opening of a through-hole (25a) formed in a cap bottom part (23a) of the cap body (20a) is closed by an axially inboard surface of an insert bottom part (48) of the fitting insert (44). ... Nsk Ltd

04/06/17 / #20170097073

Toroidal continuously variable transmission

There is provided a toroidal continuously variable transmission including an input side disk and an output side disk which are provided to be concentric with each other and rotatable in a state where inner side surfaces thereof face each other, and a power roller which is interposed between the input side disk and the output side disk. At least one of the input side disk and the output side disk is configured as a gear disk which has teeth on an outer circumferential portion thereof. ... Nsk Ltd

04/06/17 / #20170096163

Electric power steering apparatus

An electric power steering apparatus with a good steering feeling that includes a function for getting out from restraint of a lateral flow or a one-sided flow, and enables acquisition of a better effect that a driver's load is reduced in the lateral flow or the one-sided flow.. . ... Nsk Ltd

03/30/17 / #20170089807

Ball bearing inspection device and inspection method

A ball bearing inspection device includes: an arbor supporting an inner ring on the outer circumferential surface; a rotary drive unit driving the arbor; a first pressing unit applying a preload to a ball bearing; a second pressing unit applying a preload in an opposite direction of the pressing direction; and a vibration detection unit detecting vibration from the ball bearing. The arbor includes an abutting section that protrudes outward from the outer circumferential surface, a movable flange arranged apart from the abutting section, and a flange drive mechanism switching the movable flange between a first state in which the movable flange protrudes from the outer circumferential surface and a second state in which the movable flange is accommodated within the arbor. ... Nsk Ltd

03/30/17 / #20170089397

Assembly method for cross shaft universal joint

In order to attach cup bearings 18 with good precision in portions between circular holes 15 that are formed in joining-arm sections 10 of yokes 7a, 7b of a cross shaft universal joint 6 and the tip-end sections of a shaft section 17a of a cross shaft 8 regardless of variation in the dimensions of the joining-arm sections 10, the circular holes 15 in the tip-end sections thereof, and the cup bearings 18, and elastic deformation of the joining-arm sections 10 of the yoke 7a during press-fitting work, press-fitting punches 33 are used to pressure fit the cup bearings 18 to a preset reference position inside the circular holes 15, and the value of the pressure that is applied to the press-fitting punches at that instant is set as a reference pressure, and at the instant when the pressure applied to the press-fitting punches becomes larger than the reference pressure by a preset specified value, the cup bearings 18 are determined to have reached positions where press-fitting is complete.. . ... Nsk Ltd

03/30/17 / #20170089392

Machined cage for thrust ball bearing, design method of the same, and thrust ball bearing including the cage

In a copper alloy machined cage for a thrust ball bearing, an inside surface of a pocket includes a cylindrical surface, a support surface which is continuous with the cylindrical surface and contacts a ball in an axial direction, and two protruding portions which are formed at an equal interval in a circumferential direction of the pocket, at a ball insertion side of the pocket which is opposite to the support surface in the axial direction and protrude from the cylindrical surface. The protruding portions prevent falling out of the ball from a ball insertion side opening of the pocket and are either elastically deformed or elastic-plastically deformed by the ball during insertion of the ball into the pocket.. ... Nsk Ltd

03/30/17 / #20170089388

Linear motion guide device

Provided is a linear motion guide device that is less noisy and excellent in operability. A concave groove of a return guide and a raceway groove of a slider are not smoothly continued at a connection portion therebetween, where a stepped portion is formed. ... Nsk Ltd

03/30/17 / #20170088164

Control apparatus and control method of on-vehicle electronic equipment

An apparatus and a method that include a program execution monitoring dedicated circuit connected to a cpu of a control apparatus of an on-vehicle electronic equipment that includes an execution time monitoring timer circuit, an execution sequence monitoring comparison circuit, a setting register, an other attached circuit and so on, perform monitoring of an execution sequence of a task executed by a control program of the on-vehicle electronic equipment and/or an execution time from a head address to an end address of the task executed by the control program, and enable the control of the on-vehicle electronic equipment such as an electric power steering apparatus to be continued by performing an alternative processing in the case of detecting an abnormality in the execution sequence and/or the execution time.. . ... Nsk Ltd

03/23/17 / #20170080513

Resistance welding device and resistance welding method, and shape of projection for projection welding

. . A resistance welding device is provided with a moving distance measuring section for measuring distances between conductors to be joined before and after joining and evaluating joining quality based on the distances, and a projection including a base and a projecting surface is provided to the conductor to be connected in order to easily secure a distance between the conductors after the joining.. . ... Nsk Ltd

03/16/17 / #20170074679

Method for detecting abnormality of resolver, angle detection device, motor, and transportation device

There are provided a method for detecting an abnormality of a resolver, an angle detection device, a motor, and a transportation device, by which the abnormality can be detected promptly without the necessity of any complicated operations. There is provided a circuit configured to switch between a sine wave and a direct current voltage to be supplied, as an excitation signal of a resolver (2). ... Nsk Ltd

03/16/17 / #20170072995

Electric power steering apparatus

An electric power steering apparatus, without outside attachment circuit, that is capable of simultaneously sampling two phases of which the duties are not saturated and of cheaply detecting the 3-shunt currents by using two a/d converting units in correspondence to the duty saturation phase (the maximum phase) changing when the motor is rotated. The apparatus calculates a current command value due to at least a steering torque, performs a pwm-control of a 3-phase motor through an inverter based on the current command value, and assist-controls a steering system of a vehicle by detecting currents of the 3-phase motor and feed-backing.. ... Nsk Ltd

03/16/17 / #20170072986

Position adjusting apparatus of steering wheel

At least one of the vehicle body side through holes and the column side through hole is an adjusting long hole which is long in a direction in which a position of the steering wheel can be adjusted. A base end portion of the adjusting lever includes a lever side through hole penetrating through the base end portion in the width direction. ... Nsk Ltd

03/16/17 / #20170072877

Steering apparatus

A steering apparatus is disclosed, which includes a steering shaft (3), an outer column (10), an inner column (11) fitted in the outer column, a guide member (31) received in a guide groove (25) formed in the outer column and fitted to the inner column (11), and an electrifying member (40) fitted to the inner column inwardly of the guide groove and getting in contact with the outer column (10).. . ... Nsk Ltd

03/09/17 / #20170069525

Table device, measuring device, machine tool, and semiconductor manufacturing device

A table device includes: a first table that includes a first upper surface; a second table that is arranged on one side of the first table in a first axial direction parallel to a first axis in a predetermined plane and includes a second upper surface; a first guiding device that guides the first table in the first axial direction; and a second guiding device that guides the second table in the first axial direction. The first and second guiding devices are arranged in a second axial direction parallel to a second axis in the predetermined plane, the second axis being perpendicular to the first axis.. ... Nsk Ltd

03/02/17 / #20170058962

Yoke for cross shaft universal joint and method for manufacturing the same

In a yoke for a cross shaft universal joint, the circumferential phases of the arrangement direction x of a pair of connecting arm parts and the arrangement direction y of first and second flange parts are shifted from each other. A bolt is tightened to put the first and second flange parts nearer to each other, thereby applying mutually approaching forces to the connecting arm parts in directions inclined relative to the axes of circular holes. ... Nsk Ltd

03/02/17 / #20170057433

Steering apparatus

A steering apparatus has a guide member (31) being received in a guide groove (25) and attached to an inner column (11), metal fittings that have conductivity, is in contact with the inner column to attach the guide member to the inner column, and an electricity-carrying plate (40) that is composed of a metal plate material having conductivity, is fixed to the inner column in contact with the metal fittings, and elastically deforms and in contact with an inside of a pair of guide walls at a predetermined contact pressure, so that a new electricity-carrying passage from a steering wheel to a vehicle body is secured.. . ... Nsk Ltd

02/23/17 / #20170051792

Yoke for cross shaft universal joint

In a yoke for a cross shaft universal joint, the forming direction of a through hole (17a) and a screw hole (18a) is inclined relative to the axes of circular holes (19a, 19a) formed in a pair of engaging arm parts (12, 12). And, by fastening a bolt (32) to thereby put first and second flange parts (14a, 15a) nearer to each other, mutually approaching forces are applied to the connecting arm parts (12, 12) in a direction inclined relative the axes of the circular holes (19a, 19a). ... Nsk Ltd

02/23/17 / #20170050668

Motor control device, electric power steering device, and vehicle

A motor control device includes a motor, a control device, and a motor drive circuit. The motor includes a motor rotor, a motor stator, and a plurality of coil groups divided into a first coil group and a second coil group of at least two systems for each of three phases, and configured to excite a stator core by three-phase alternating currents. ... Nsk Ltd

02/16/17 / #20170047818

Direct drive motor, conveyance device, inspection device, and machine tool

A direct drive motor includes: a motor unit including a stator and a rotor rotatable with respect to the stator; a housing including a first housing to which the stator is fixed and a second housing to which the rotor is fixed; a bearing that rotatably supports the second housing with respect to the first housing; and a rotation detector that detects a rotating state of the motor unit. The rotation detector is a single incremental-type resolver that detects a relative displacement of the rotor with respect to the stator.. ... Nsk Ltd

02/16/17 / #20170047811

Bearing device, conveying device, inspection device, and machine tool

A bearing includes an inner ring and an outer ring arranged to face each other with a rolling element interposed therebetween, and a housing including a housing inner supported by the inner ring and a rotor flange supported by the outer ring. The rotor flange includes a flange portion extending toward one end surface side in an axial direction of the outer ring, and a c-type retaining ring arranged at the other end surface side in the axial direction of the outer ring. ... Nsk Ltd

02/16/17 / #20170045123

Toroidal continuously variable transmission

A toroidal continuously variable transmission include a pair of disks which is provided rotatably and concentrically with each other in a state where inner surfaces of respective disks are opposed to each other and a power roller held between the disks opposing to each other. One of the disks is supported on a shaft. ... Nsk Ltd

02/09/17 / #20170037907

Rotation mechanism, machine tool, and semiconductor manufacturing device

A rotation mechanism includes: a housing; a shaft inserted through a hole provided at the housing; bearings installed at the housing and rotatably supporting the shaft; a rotary member provided at one end portion of the shaft, adapted to be rotated together with the shaft, and having a portion that projects to a radially outer side of the hole and faces the housing with a gap having a predetermined size; and a gas passage adapted to connect the gap to outside of the housing and allow gas contained in a portion of the gap to pass to the outside of the housing.. . ... Nsk Ltd

02/02/17 / #20170030446

Ball screw device

There is provided a ball screw device capable of allowing interference to be easily elastically deformable and decreasing friction resistance of a seal member with respect to a screw shaft without damaging seal properties of the seal member. A predetermined section of a land sliding-contact portion (46) of a sliding-contact portion (40) and a section of a seal piece (37) of a lip portion (31) corresponding to the predetermined section are bent to protrude in one side in the axial direction of a nut (7) so that a protrusion (55) is formed, the bent section of the land sliding-contact portion (46) and the bent section of the seal piece (37) configure a pair of side surface portions (58, 58) of the protrusion (55) and a bottom portion (61) connecting the one side ends of the pair of side surface portions (58, 58).. ... Nsk Ltd

02/02/17 / #20170030405

Bearing device, conveying device, inspection device, and machine tool

A bearing includes an inner ring and an outer ring arranged to face each other with a rolling element interposed therebetween, and a housing including a housing inner supported by the inner ring and a rotor flange supported by the outer ring. The rotor flange includes a pair of c-type retaining rings respectively arranged at one end surface side in an axial direction of the outer ring and at the other end surface side in the axial direction of the outer ring, groove portions extending in a circumferential direction and in which the pair of c-type retaining rings is respectively mounted, and first gap sealing members formed of a resin material and arranged in gaps between the c-type retaining rings and the respective end surfaces in the axial direction of the bearing, and gaps between the c-type retaining rings and the groove portions.. ... Nsk Ltd

02/02/17 / #20170029011

Steering wheel position-adjustment device

The occurrence of a collision sound between a driven-side cam 32a and a long tilt hole 25b in which the driven-side cam 32a engages when tilting an adjustment lever 18a for adjusting the position of a steering wheel is prevented. Bracket-side inclined surface sections 37 that are inclined in directions outward in the width direction going away in the forward-backward direction from both side edges in the forward-backward direction of a long tilt hole 25b are provided on both side edge sections in the forward-backward direction of the long tilt hole 25b in the outside surface of a support-plate section 24b. ... Nsk Ltd

01/26/17 / #20170023124

Ball screw

There is provided a ball screw that is used to apply a preload to balls and that has a configuration of achieving a balance between the cooling efficiency and ease of assembly and disassembly. To this end, the ball screw includes a screw shaft, and a plurality of nuts movable relative to the screw shaft in an axial direction. ... Nsk Ltd

01/19/17 / #20170016482

Bearing unit

A shaft includes a head part having an outer diameter greater than an inner diameter of an inner ring and being in contact with a side surface on one axial end side of the inner ring, and a column part extending from the head part toward the other axial end side and having an axial width greater than a bearing. An external periphery of the other axial end portion of the column part is formed with a male screw to be fastened with a support arm. ... Nsk Ltd

01/19/17 / #20170015346

Steering device

A steering device includes a cylindrical inner column, a cylindrical outer column, a column bracket, a tilt bolt, a lock member attached to the outer periphery of the tilt bolt, a first fixing mechanism, and a second fixing mechanism. The first fixing mechanism clamps the outer column by a pressing bracket in response to the rotation of an operation lever. ... Nsk Ltd

01/12/17 / #20170009813

Rolling bearing unit with rotating speed detector

The portion axially opposed to an encoder 13a in a bottom part 23a constructing the cap 19a for closing an opening of an axially inboard end of an outer ring 2 is formed with a through hole 25a pierced in an axial direction. And, the bottomed cylindrical sensor insertion case 26a made of a non-magnetic material is axially inserted into an inside of the through hole 25a with a bottom plate part 35a facing to the lead, and is internally fitted to the inside of the through hole 25a. ... Nsk Ltd

01/12/17 / #20170008551

Steering rack and method for manufacturing the same

A steering rack meshes with a pinion rotatably driven by the input shaft of a steering gear constituting an automotive steering device. The steering rack is provided with a an axially extending rod part of round cross section, and a plurality of rack teeth formed on a radial one side surface of an axial portion of the rod part, the rack teeth meshing with the pinion. ... Nsk Ltd








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