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Kyb Corporation patents


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

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "K" | Kyb Corporation-related inventors


Stroke detector

A stroke detector includes: a cylinder tube; a piston rod configured to advance and retract with respect to the cylinder tube; a scale that is formed on the piston rod; and a first mr sensor and a second mr sensor that are provided on the cylinder tube. The scale has a first edge portion that is opposed to the first mr sensor and a second edge portion that extends at a different angle from that of the first edge portion and that is opposed to the second mr sensor.. ... Kyb Corporation

Shock absorber

Provided is a unidirectional shock absorber without losing a damping force reducing effect even with continuous input of high-frequency vibrations. A shock absorber includes: a piston partitioning a cylinder into an extension chamber and a compression chamber; a pressure chamber; a free piston slidably inserted into the pressure chamber; a spring element; an extension chamber-side passage; a compression chamber-side passage; a valve provided to the extension chamber-side passage and configured to offer resistance to a flow from a side closer to the extension chamber to a side closer to the compression chamber; and a check valve provided in parallel with the valve, allowing only a flow from the side closer to the compression chamber to the side closer to the extension chamber, wherein the shock absorber generates a damping force only at the time of elongation.. ... Kyb Corporation

Control system for construction machine

A control system for a construction machine includes a fluid pressure pump, a fluid pressure actuator having a load-side pressure chamber and an anti-load side pressure chamber, an operation valve switched to supply the working oil to the anti-load side pressure chamber and to discharge the working oil from the load-side pressure chamber when the pilot pressure is led to the pilot chamber on the basis of an operation by an operator, a regenerative flow rate control valve switched to lead a part of the working oil discharged from the load-side pressure chamber to the anti-load side pressure chamber when the pilot pressure is led to the pilot chamber, a pilot communication flow passage for allowing the pilot chamber and the pilot chamber to communicate, and a switching valve for switching the pilot communication flow passage between a communication state and a shut-off state.. . ... Kyb Corporation

Valve device and fluid pressure control device

A valve device includes a valve body, a drain chamber wall configured to define a drain chamber, a drain port formed in the drain chamber wall facing the valving element, and a drain passage configured to guide drain fluid from another valve device to the drain chamber, wherein at least one of the drain chamber wall and the valving element includes a communicating passage configured to allow the drain port to communicate with the drain chamber when the movement of the valving element is restricted by the drain chamber wall.. . ... Kyb Corporation

Front fork

There is provided a front fork provided with a plurality of adjusters, while including a spring adjuster. In order to achieve the above object, in a front fork f according to the means for solving the problem of the present invention, a spring adjuster a is rotatably mounted on a position eccentric to a center o of a cap 4 as viewed in an axial direction and includes a screw portion 35 disposed in an outer periphery protruded into a fork main body 1, and a plate p in which the screw portion 35 of the spring adjuster a is screwed to change support positions of a suspension spring s is brought into contact with a case (tubular member) 14a at two points on both sides in a circumferential direction of the normal of the case 14a that passes a mounting center of the spring adjuster a. ... Kyb Corporation

Control system and control method for hybrid construction machine

A control system for a hybrid construction machine, includes: a fluid pressure pump; a regeneration motor rotationally driven by refluxed working fluid; a rotating electric machine rotationally driven by the regeneration motor; an energy storage part into which regenerated electric power is charged; and a temperature detecting part adapted to detect a temperature of the energy storage part, a control part charging with regenerated electric power when a temperature of the storage part becomes below a first set temperature, until achieving a voltage higher than a charge termination voltage of when the temperature of the storage part is equal to or more than the first set temperature by an amount of internal resistance according to the temperature of the storage part.. . ... Kyb Corporation

Shock absorber

A shock absorber provided with a suspension spring, the shock absorber includes a tube whose lower end portion is joined to a vehicle axle side portion provided with a tire, and a lower spring bearing that is provided on an outer circumference of the tube and supports a lower end of the suspension spring. An increased diameter part is provided on the outer circumference of the tube above the lower spring bearing, the increased diameter part having an outer diameter larger than an outer diameter of the tube.. ... Kyb Corporation

Fluid pressure control device

A fluid pressure control device includes a first circuit system having a first pump and a first control valve. The first circuit system includes an intermediate cut valve provided downstream of the first control valve in a first intermediate passage and which connects and disconnects a connection between the first intermediate passage and the tank, and an external output port communicating at a part downstream of the first control valve in the first intermediate passage and upstream of the intermediate cut valve, the external output port being capable of externally supplying working fluid discharged from the first pump.. ... Kyb Corporation

Purification apparatus and purification treatment vehicle

There is provided a purification apparatus that packages two apparatuses that respectively perform separation treatment and purification treatment into a single apparatus, to reduce a size of the apparatus and facilitate easier transportation to the site, and to improve a treatment amount of contaminated earth and sand per unit time. The purification apparatus includes a drum rotatable around an axis, a sieve having a cylindrical shape and being fixedly accommodated in the drum, a first blade having a spiral shape and being provided between the drum and the sieve, and the second blade having a spiral shape and being provided in the sieve. ... Kyb Corporation

Front fork

A front fork includes a tubular cylinder; a free piston slidably inserted into the cylinder to partition the cylinder into a pressure chamber and a reservoir; a piston slidably inserted into the cylinder to partition the pressure chamber into an extension-side chamber and a contraction-side chamber; a piston rod having one end connected to the piston and the other end side extending oppositely to the free piston side and protruding outward of the cylinder; a passage configured to allow the pressure chamber and the reservoir to communicate with each other; and a check valve provided in the passage and configured to allow only a flow of the hydraulic fluid from the reservoir to the pressure chamber.. . ... Kyb Corporation

Damper

There is provided a damper that can reduce a shock when a piston speed reaches a high speed range from a low speed range without deteriorating a ride comfort while the piston speed is in the low speed range. In order to solve the above-mentioned problem, in a damper d of the present invention, since a orifice (7) and an opening/closing valve (9) are arranged in parallel with a bypass passage (b) bypassing a damping passage (3), and a valve opening pressure of an opening/closing valve (9) is made lower than a valve opening pressure of a damping valve (5), a sudden change in an inclination of a damping force characteristic can be moderated at an inflection point of the damping force characteristic even if the damping force is increased while the piston speed is in the low speed range.. ... Kyb Corporation

Shock absorber

There is provided a shock absorber enabling a shock at the time of transition from a low speed region to a high speed region to be reduced without impairing ride quality in an ultra-low speed region. The shock absorber includes a compression-side second damping passage connecting two chambers to each other by bypassing a compression-side main valve opening/closing a compression-side first damping passage connecting the two chambers to each other to give resistance to flow of liquid flowing in the compression-side first damping passage and a compression-side throttle valve throttling the compression-side second damping passage. ... Kyb Corporation

Front fork

There is provided a front fork which has a small number of components with simple structure and is easy to assemble. In order to achieve the above object, in a front fork f according to the means for solving the problem of the present invention, first and second adjusters 5, 6 are mounted on a cap 4 so as to be axially movable, and a contact portion 52 of the first adjuster 5 in contact with a first adjustment rod 7 and a contact portion 62 of the second adjuster 6 in contact with a second adjustment rod 8 are displaced in an axial direction of a vehicle body tube 2 so as not to interfere with each other. ... Kyb Corporation

Fluid pressure motor, brake device of the same, and method of manufacturing brake device

A brake device that puts a brake on a hydraulic motor includes a disc plate configured to rotate with a cylinder block, a brake piston supported by a first case, and brake springs compressed and placed between the brake piston and a second case. The second case has a dent shaped or projection shaped holding portion into which one ends of the brake springs are inserted, and the brake springs are held by the holding portion even in a state where the other ends are away from the brake piston.. ... Kyb Corporation

03/01/18 / #20180058527

Brake device

The brake device includes a coupling member configured to couple one end portions of a pair of link arms to each other, the coupling member being extendable and contractable; and an adjuster configured to cause the coupling member to extend. The adjuster includes: an extension mechanism having an extension shaft provided with a male thread and an extension nut provided with a female thread configured to be screwed with the male thread; and a resistance imparting portion configured to impart resistance to the rotation of the extension nut. ... Kyb Corporation

02/22/18 / #20180051722

Single-acting hydraulic cylinder

A single-acting hydraulic cylinder includes a cylinder head provided in the opening of the cylinder tube to allow the piston rod to be inserted, a bushing provided on an inner circumference of the cylinder head to slidably support the piston rod, and a housing recessed portion formed on the inner circumference of the cylinder head to receive the bushing forcibly inserted from the inlet portion. A bottom clearance filled with the grease is formed between the bottom face of the housing recessed portion and the bushing.. ... Kyb Corporation

02/01/18 / #20180031070

Shock absorber

Providing a shock absorber including a sensor accurately detecting a position of a cylinder relative to a piston rod. The shock absorber includes a cylinder, a piston, a piston rod, and a sensor. ... Kyb Corporation

02/01/18 / #20180031012

Fluid pressure cylinder

A hydraulic cylinder includes: a cylindrical cushion bearing that is clamped between a piston and a step portion of a piston rod; a cushion passage that is formed between the cushion bearing and a bearing receiving portion and that imparts resistance to the flow of the working oil passing therethrough; and a check seal that is provided between the inner circumference of the cushion bearing and the outer circumference of the piston rod. The check seal shuts off the flow of the working fluid from a connection gap between the piston rod and the piston towards the rod side chamber through the annular gap and allows the flow of the working fluid from the annular gap towards the bottom-side chamber through the connection gap.. ... Kyb Corporation

02/01/18 / #20180031006

Fluid pressure control device

A fluid pressure control device includes a switching valve that has a pilot chamber to which the working oil is supplied from the supply passage through the second control valve, and a first relief valve that is provided on the downstream side of the switching valve. The second control valve allows supply of the working oil to the pilot chamber in a case where a flow of the working oil to a tilt cylinder is allowed, and blocks the supply of the working oil to the pilot chamber in a case where the flow of the working oil to the tilt cylinder is blocked. ... Kyb Corporation

01/18/18 / #20180017160

Sealing device

Problem: provided is a sealing device which has reduced wear of a metallic member in sliding portions having electric-resistance welded carbon steel and a fiber reinforced resin member. Means for resolution: a sealing device having a mechanism in which a metallic member and a resin member relatively slide, wherein the metallic member is formed from electric-resistance welded carbon steel, and the resin member is formed from a carbon-fiber reinforced synthetic resin.. ... Kyb Corporation

12/21/17 / #20170366064

Electric motor

An electrical motor includes a stator; a rotor attached to an output shaft and supported within the stator; a cylindrical case housing the stator and the rotor inside; ball bearings rotatably supporting the output shaft; and a second cover member closing an opening of the case, the ball bearing being attached to the second cover member. An outer ring of the ball bearing and the second cover member are integrally formed of resin material.. ... Kyb Corporation

12/14/17 / #20170356522

Shock absorber

A controller of a shock absorber has a differential path configured to perform derivative compensation on the basis of a difference between a target pressure and a detected pressure or on the basis of the detected pressure, multiply the compensated value by a negative gain, and output a resulting value of the multiplication, and obtains an electric current instruction applied to a pressure control solenoid valve.. . ... Kyb Corporation

12/14/17 / #20170354251

Vibration damping shelf

Providing a vibration damping shelf which can suppress fall of articles placed on a shelf member while suppressing shake of other articles or the like. The vibration damping shelf includes a damper and shelf plates. ... Kyb Corporation

12/07/17 / #20170350524

Control valve device

A control valve device includes a valve main body formed to have an actuator port connected to an actuator, a communication passage formed in the valve main body and configured to allow the actuator port to communicate with a drain port, and an on/off valve provided between the communication passage and the drain port, and the on/off valve includes a sheet member assembled to the valve main body, an orifice provided in the sheet member, and a poppet member configured to open and close a sheet portion of the sheet member.. . ... Kyb Corporation

12/07/17 / #20170350509

Sealing member and fluid pressure device provided therewith

Providing a sealing member which can successfully scrape off foreign substances and prevent failure caused by incorporation of foreign substances. A dust seal serving as a sealing member includes a dust seal body and a lip member. ... Kyb Corporation

12/07/17 / #20170349022

Suspension device and suspension control unit

A suspension device includes an actuator capable of generating a thrust force and a controller. The controller includes a first vibration suppression force computation unit configured to obtain a first vibration suppression force from a vertical velocity of a sprung member, a second vibration suppression force computation unit configured to obtain a second vibration suppression force from a vertical velocity of the unsprung member or a relative velocity between the sprung member and the unsprung member, a low-pass filter having a breakpoint frequency between a sprung resonance frequency and an unsprung resonance frequency and processing a signal in the course of obtaining the second vibration suppression force using the second vibration suppression force computation unit, and a target thrust force computation unit configured to obtain a target thrust force of the actuator on the basis of the first vibration suppression force and the second vibration suppression force.. ... Kyb Corporation

11/30/17 / #20170340115

Overturn preventing device

Providing an overturn preventing device which can easily be mounted and can prevent articles from overturn. The overturn preventing device includes an abutting part and a connecting part. ... Kyb Corporation

11/16/17 / #20170328440

Damping valve and shock absorber

A damping valve includes a valve disc including a passage and a valve seat configured to surround an outlet end of the passage, a leaf valve configured to separate from/sit on the valve seat to open/close the passage, and a biasing part configured to exert a variable biasing force on the leaf valve toward the valve disc, and a gap is provided between the leaf valve and the valve seat.. . ... Kyb Corporation

11/09/17 / #20170324315

Linear actuator

A linear actuator includes: a first tube provided with coils placed there inside, the coils being held by a yoke; a rod configured to be movable in the yoke in an axial direction; and permanent magnets that are held by the rod while being lined up in the axial direction so as to oppose the coils. The first tube includes an inner tube and a base portion. ... Kyb Corporation

11/09/17 / #20170321730

Device mounting structure

A device mounting structure for mounting a load maintaining mechanism on a hydraulic cylinder, a pipe for suppling and discharging working oil to and from the hydraulic cylinder being connected to the load maintaining mechanism such that the working oil is led thereto, includes a single coupling portion that includes a screw hole and is provided on the hydraulic cylinder, and a bracket to which the load maintaining mechanism is fixed, the bracket being coupled to the coupling portion via a first screw member that is screwed into the screw hole, wherein the bracket includes a first through hole through which the first screw member is passed so as to leave a gap in a radial direction.. . ... Kyb Corporation

11/09/17 / #20170321696

Variable displacement vane pump

A variable displacement vane pump includes: a restrictor configured to impart resistance to flow of working fluid discharged from the pump chambers; a control valve configured to introduce the working fluid which is discharged from the pump chambers to the first fluid pressure chamber as a differential pressure between upstream and downstream of the restrictor is increased, the control valve being configured to discharge the working fluid in the first fluid pressure chamber as the differential pressure between upstream and downstream of the restrictor is reduced; a suction passage configured to guide the working fluid to be sucked into the pump chambers, the suction passage being configured to always communicate with the second fluid pressure chamber; and a guiding passage configured to allow communication between the control valve and the second fluid pressure chamber, the guiding passage being configured to guide the working fluid, which is discharged from the first fluid pressure chamber to the control valve, to the second fluid pressure chamber.. . ... Kyb Corporation

11/09/17 / #20170320368

Suspension device and suspension control unit

A suspension device includes an actuator device provided with an extensible/contractible actuator body interposed between a sprung member and an unsprung member of a vehicle, a pump that supplies fluid to the actuator body to extend or contract the actuator body, and a controller that controls a rotation number of the pump. The controller has a road surface state index obtainment unit that obtains a road surface state index and a target rotation number determination unit that determines a target rotation number of the pump on the basis of the road surface state index.. ... Kyb Corporation

10/26/17 / #20170310176

Rotor, method of manufacturing rotor, and rotary electric machine including rotor

A rotor includes a rotor core fixed to a shaft in such a manner that the rotor core is rotatable integrally with the shaft, the rotor core having a plurality of permanent magnets mounted thereon throughout a circumferential direction; and a tubular rotor cover covering an outer circumference of the rotor core. The rotor cover includes an angular portion and a groove portion, the angular portion has a shape of a circular ring and is formed at an axial end of the rotor core, the groove portion is formed in the rotor cover, in a course of formation of the angular portion, as a dent between a circumferentially neighboring pair of the plurality of permanent magnets.. ... Kyb Corporation

10/12/17 / #20170292580

Shock absorber

A shock absorber includes a tube that has one end from which a piston rod extends, a capping member disposed in an end portion at a side of the one end in the tube, the capping member including a locking portion formed on an outer peripheral surface, and a cover member disposed in a distal end side of the piston rod, the cover member including a locked portion locked to the locking portion formed on an inner peripheral surface, wherein the shock absorber is kept in a contracted state by the locked portion of the cover member being locked to the locking portion of the capping member.. . ... Kyb Corporation

10/12/17 / #20170292579

Shock absorber

A shock absorber includes a plate and a lock portion. The plate is secured to a distal end side with respect to a nut of a piston rod by crimping the piston rod. ... Kyb Corporation

10/05/17 / #20170284557

Solenoid and solenoid valve

A solenoid includes a coil configured to generate magnetic force when a current flows therethrough; a stator core provided inside the coil, the stator core being configured to be excited by the magnetic force of the coil; a plunger received in a plunger chamber formed inside the stator core, the plunger being configured to move toward an attraction part in the plunger chamber by the magnetic force of the coil; a shaft provided to be able to move, together with the plunger, along axial direction; and a filter provided inside the stator core. The filter is provided on a side of the attraction part from the plunger and in an axial range where the coil is provided.. ... Kyb Corporation

10/05/17 / #20170284087

Overturn preventing device

Providing an overturn preventing device which is easy in handling such as carrying. The overturn preventing device includes a damper, a first base portion, a second base portion and a connecting tool. ... Kyb Corporation

09/28/17 / #20170276253

Solenoid valve

A solenoid valve includes a housing having a valve passage; a spool configured to switch between an open and closed state of the valve passage; a coil part configured to generate magnetic force when electric current flows therethrough; a yoke surrounding the coil part; a fluid passage provided on an outer side of the coil part, through which the working fluid passes; an introduction passage communicating with the fluid passage to guide the working fluid inside the housing to the fluid passage; and a discharge passage communicating with the fluid passage to discharge the working fluid passed through the fluid passage outside the yoke.. . ... Kyb Corporation

09/28/17 / #20170276205

Liquid pressure device

Provided is a liquid pressure device having no dead band in generation of force and causing no contamination, the liquid pressure device including a bottom cap and a head cap welded to an outer tube, and a rod guide fastened to the head cap, and one end of a pipe is fit in the bottom cap and the other end of the pipe is fit in the rod guide, and the bottom cap and the rod guide sandwich a cylinder. Accordingly, the liquid pressure device of the present invention can add shaft force to the cylinder while supporting the pipe, an inside of which is isolated from a tank, by the bottom cap and the rod guide, and does not need to braze the pipe to the bottom cap. ... Kyb Corporation

09/28/17 / #20170274718

Strut rod made of composite material for suspension of front axle of vehicle

The invention relates to a strut rod made of composite material for a suspension of a front axle of a vehicle, including: an upper part coupled to a rod and piston assembly connected to a vehicle body; and a u-shaped lower part including two brackets for fixing a knuckle arm of the vehicle. This strut rod includes means for detecting a crack. ... Kyb Corporation

09/21/17 / #to accurately monitor the status of an antenna even when characteristics of the antenna chronologically change, the antenna is replaced, and the like.

Kyb Corporation

. . ... Kyb Corporation

09/21/17 / #[object] to provide a suspension control apparatus, a suspension control method, and a program, by which unsprung vibrations or sprung vibrations of each wheel can be efficiently suppressed.

Kyb Corporation

. . ... Kyb Corporation

09/21/17 / #20170268595

Damping valve and damper

A damping valve includes a valve disc, a ring-shaped leaf valve, and a biasing mechanism. The valve disc includes a passage and a valve seat. ... Kyb Corporation

09/21/17 / #20170267048

Signal processing apparatus, signal processing method, suspension control apparatus, and suspension control method

A signal processing apparatus (20) is a signal processing apparatus for a suspension control apparatus and includes a first determination unit (41). The first determination unit (41) is configured to select any one of a plurality of detection signals including information regarding unsprung vibrations of a first wheel, which are acquired from a plurality of sensors mounted on a vehicle, and determine unsprung vibrations of the first wheel on the basis of the selected one detection signal.. ... Kyb Corporation

09/14/17 / #20170261389

Inspection device for displacement sensor and inspection method of the same

An inspection device for displacement sensor includes a sequence data obtaining unit configured to obtain sequence data as an output value of the displacement sensor according to input continuously changing in a constant temporal gradient; a difference calculation unit configured to obtain a difference between a value at a certain point in the sequence data and a value at a point advancing from the point by a predetermined evaluation pitch to calculate difference sequence data; a moving average calculation unit—configured to obtain a moving average of a predetermined number of data centered at a certain point in the difference sequence data to calculate post-averaged sequence data; and a determining unit configured to determine that the displacement sensor is normal when an amplitude of an output value of the post-averaged sequence data is smaller than a determination threshold for amplitude.. . ... Kyb Corporation

09/14/17 / #20170261061

Shock absorber

A shock absorber includes: a bottomed cylindrical outer tube that is disposed so as to cover an inner case, and that is formed of a resin and is closed at one end by a closing part; a joint member that is embedded by insert molding in an opening end of the outer tube; and a coupling member that is coupled to the joint member.. . ... Kyb Corporation

09/14/17 / #20170261060

Shock absorber

In a shock absorber, an outer case made of resin is disposed so as to cover an inner case made of metal, and the outer case forms a reservoir chamber for storing the hydraulic fluid between the outer case and the inner case. The outer case is supported by the inner case via protrusions, which are formed on either one of the outer peripheral surface of the inner case and the inner peripheral surface of the outer case so as to protrude toward and abut the other one of the outer peripheral surface of the inner case and the inner peripheral surface of the outer case.. ... Kyb Corporation

09/07/17 / #20170257015

Linear actuator

A linear actuator includes: a first tube provided with coils placed there inside, the coils being held by a yoke; a second tube mounted on an outer circumference of the first tube; a rod fixed to an end of the second tube at one end; and permanent magnets held by the rod while being lined up in an axial direction. When the first tube and the second tube are at a fully contracted position, a gap is provided between an end face of an outer tube of the second tube and an opposing face of a base portion of the first tube.. ... Kyb Corporation

09/07/17 / #20170254381

Shock absorber

In a shock absorber 100, 200, an inner case 1 is biased in the axial direction relative to an outer case 2 made of resin by a spring 5, and the inner case 1 and the outer case 2 abut each other in the radial direction via ribs 2g, 8c.. . ... Kyb Corporation

09/07/17 / #20170251811

Overturn preventing device

Providing an overturn preventing device which can be mounted to an article such as furniture irrespective of an installation location of the article and which can prevent the article from being overturned by quakes of an earthquake or the like. The overturn preventing device includes a plurality of dampers mounted between a top surface of the furniture installed on a floor surface and a ceiling. ... Kyb Corporation

08/31/17 / #20170250597

Linear actuator

A linear actuator includes; a first tube provided with a plurality of coils placed thereinside, the plurality of coils being held by a tubular yoke; a rod that is movable in an axial direction inside the yoke; a plurality of permanent magnets held by the rod while being lined up in the axial direction, the plurality of permanent magnets opposing the plurality of coils; and a detent member configured to prevent relative rotations of the first tube and the yoke.. . ... Kyb Corporation

08/24/17 / #20170244311

Linear actuator

A linear actuator includes: a first tube provided with coils placed there inside, the coils being held by a yoke; a second tube mounted on an outer circumference of the first tube; a rod fixed to an end of the second tube at one end; permanent magnets held by the rod while being lined up in an axial direction; and a joint portion disposed at the outer side of the second tube, to be joined with an external device. The rod has a non-magnetic portion at the one end fixed to the second tube. ... Kyb Corporation

08/24/17 / #20170241555

Load sensing valve device

A compensator spool of a load sensing valve device includes a pressure chamber, a compensator throttle portion, a pressure introduction chamber, a pressure introduction port, a maximum load pressure introduction chamber, and a selector valve. A groove is formed around the pressure introduction port, and a groove moves relatively between a passage communicating with an actuator to reduce an opening area of the pressure introduction port when the compensator spool moves.. ... Kyb Corporation

08/24/17 / #20170240242

Suspension apparatus

A suspension apparatus includes a pair of dampers configured to extend/contract to exert a damping force, each of the dampers includes a cylinder, a piston slidably inserted into the cylinder and configured to partition the inside of the cylinder into an extension-side chamber and a contraction-side chamber, and a piston rod connected to the piston and movably inserted into the cylinder, and an inner diameter of the cylinder of one of the dampers is different from an inner diameter of the cylinder of the other.. . ... Kyb Corporation

08/17/17 / #20170234377

Parking brake unit

A parking brake unit of a brake device for braking a wheel includes a first piston having a first engaging part on an inner circumference thereof, the first piston being configured to move in first direction by pressure of the hydraulic fluid supplied to a pressure chamber defined in the back thereof, a first biasing member configured to bias the first piston in second direction, opposite to the first direction, a second piston slidably provided on the inner circumference of the first piston, the second piston having a second engaging part on an outer circumference thereof, and an engaging member configured to cause the first engaging part and the second engaging part to engage with each other, in which the second piston causes a brake lining to move in direction bringing the wheel to be in a braking state, when the first piston moves in the second direction.. . ... Kyb Corporation

08/17/17 / #20170231390

Overturn preventing device

Providing an overturn preventing device which can successfully prevent overturn of an article. The overturn preventing device includes a damper mounted between a piece of furniture and a ceiling and a setting member connected to both ends of the damper. ... Kyb Corporation

08/17/17 / #20170231389

Overturn preventing device and method of mounting the same

Providing an overturn preventing device which can easily be mounted between a top surface of a piece of furniture and a ceiling while an axis line of a damper relative to a vertical direction is inclined at an angle ranging from 15° to 25°. The overturn preventing device includes a damper, a first base portion and a second base portion. ... Kyb Corporation

08/10/17 / #20170227007

Pump device

A pump device includes a flow control valve that returns a part of working fluid discharged from a pump to the suction side, and the flow control valve includes a valve body, a first fluid pressure chamber that is provided so as to face against a first-side end surface of the valve body and that is communicated with a discharge channel, a second fluid pressure chamber that is provided so as to face against a second-side end surface of the valve body and that is communicated with the discharge channel, a biasing member that is accommodated in the second fluid pressure chamber for biasing the valve body in the valve-closing direction, and a pressure regulator that is provided in a communicating passage through which the discharge channel is communicated with the second fluid pressure chamber and that adjusts pressure in the second fluid pressure chamber.. . ... Kyb Corporation

08/10/17 / #20170225536

Suspension device

A suspension device includes a damper having an extension-side chamber and a contraction-side chamber, an air spring that exerts a resilient force in a direction in which the damper is extended, and a control part that independently adjusts the pressures of the extension-side chamber and the contraction-side chamber to control a force exerted by the damper. The control part makes the damper exert a balancing force against the resilient force of the air spring in a predetermined stroke range of the air spring.. ... Kyb Corporation

08/03/17 / #20170218984

Cylinder device

An object is to provide a cylinder device which can be used successfully over a long period of time. The cylinder device includes a cylinder, a piston, an external cylinder, a tank and first piping. ... Kyb Corporation

07/27/17 / #20170211995

Torque sensor and electric power steering apparatus

The torque sensor includes a detection unit for detecting the magnetic transition through a through hole formed so as to penetrate a radial-side surface of the housing; a housing chamber formed to be raised outward in a radial direction from an outer circumferential surface of the housing so that the through hole opens into the housing chamber accommodating the detection unit; a communication hole provided so as to extend in the tangential direction with respect to an outer circumference of the housing, the communication hole making an outside of the housing and an inside of the housing chamber communicate with each other; and an output terminal fitted into the communication hole and connected to the detection unit in a tilting state, the output terminal being configured to output a signal to the outside on the basis of a detected signal.. . ... Kyb Corporation

07/27/17 / #20170211652

Shock absorber

A shock absorber includes an expansion-side passage and a contraction-side passage arranged alternately side by side along a circumferential direction, seats provided to surround an outlet port of the expansion-side passage or an outlet port of the contraction-side passage, and valve bodies. The seats has an arc-shaped outer seat portion, middle seat portions extending from respective both ends in a circumferential direction of the outer seat portion toward a center axis side of the piston, and an inner seat portion extending from center axis side ends of the middle seat portions oppositely to the outer seat portion side in a circumferential direction to connect the neighboring middle seat portions. ... Kyb Corporation

07/20/17 / #20170204930

Piston and shock absorber

A piston includes: a disk-shaped piston body; an annular valve seat axially projecting from a first end of the piston body; and at least one port axially extending from the area inside the annular valve seat in the first end of the piston body to a second end of the piston body, and the port has a cross-sectional shape of a rounded rectangular having two arc-shaped opposite sides on one circle, the cross-sectional shape being the same all the way along the piston body.. . ... Kyb Corporation

07/06/17 / #20170190249

Liquid pressure drive system

A hydraulic drive system includes: a first hydraulic motor and a second hydraulic motor configured to be driven by working oils respectively discharged from a first hydraulic pump and a second hydraulic pump; a first pump control unit and a second pump control unit configured to control discharge volumes and discharge directions of the first hydraulic pump and the second hydraulic pump; a signal pressure generating unit configured to generate a signal pressure for adjusting command pressures to control the first pump control unit and the second pump control unit in accordance with the sum of discharge pressures of the first hydraulic pump and the second hydraulic pump; and a first pressure adjusting unit and a second pressure adjusting unit configured to adjust the command pressures in accordance with the signal pressure.. . ... Kyb Corporation

06/22/17 / #20170175915

Solenoid valve

A solenoid valve includes a housing having a cylindrical shape and having a valve path, a spool adjusting an opening degree of the valve path, a coil producing a magnetic force when a current passes therethrough, a first and a second stator core excited by the magnetic force of the coil, a shaft configured to be movable along axial direction together with the spool, a plunger fixed to the shaft and moving in the axial direction by adsorption force acting between itself and the first stator core by the magnetic force of the coil, and a coil spring biasing the spool against the adsorption force acting on the plunger. A spring constant of the coil spring increases as the adsorption force increases by the movement of the plunger.. ... Kyb Corporation

06/15/17 / #20170166269

Seal structure of crawler-driving apparatus

A seal structure is provided to block a clearance between a rotational casing and a fixed housing for driving a crawler of a crawler vehicle. A seal ring is held in a first annular holding groove provided in the fixed housing together with a first o-ring that biases the seal ring toward the outside of the first holding groove. ... Kyb Corporation

06/15/17 / #20170166247

Electric power steering device

An electric power steering device includes a phase advance correction unit configured to advance a phase of a steering torque signal detected by a torque sensor detecting a steering torque input from a steering wheel, a specific frequency extraction unit configured to extract a component in a specific frequency band out of the steering torque signal detected by the torque sensor, a gain multiplication unit configured to correct a steering torque signal computed on the basis of an output signal of the phase advance correction unit and an output signal of the specific frequency extraction unit such that the steering torque signal reaches a limit value set by a limiter by multiplying the steering torque signal by a gain, and an addition unit configured to add an assist correction command value calculated on the basis of an output signal output from the gain multiplication unit to the assist command value.. . ... Kyb Corporation

06/15/17 / #20170166246

Electric power steering device

A electric power steering device includes a basic return command value calculation unit configured to calculate a basic return command value in a direction to return a steering wheel to a neutral position on the basis of a steering angle of the steering wheel, a return command value calculation unit configured to calculate a return command value by correcting the basic return command value by the first correction gain, and an opposite return command value calculation unit configured to calculate an opposite return command value in a direction not to return the steering wheel to the neutral position on the basis of an angular acceleration of an electric motor. A correction return command value is calculated on the basis of the return command value and the opposite return command value and the electric motor is driven by adding the correction return command value to the assist command value.. ... Kyb Corporation

06/15/17 / #20170166028

Signal level detection device and signal level detection method

A signal level detection device 1 and a signal level detection method according to a means for solving a problem of the present invention varies a cut-off frequency ωc, of a variable low-pass filter 3 which filters a signal level r. The cut-off frequency ωc is varied based on the signal level r or information referred to for estimating the signal level. ... Kyb Corporation

06/15/17 / #20170164599

Spraying device and boom damping device

A boom damping device includes a fluid pressure cylinder configured to perform an expansion/contraction operation in conjunction with rotational movement of a boom in a roll direction of a working vehicle, a first pressure accumulator into/out of which an operating fluid flows through a first passage with the expansion/contraction operation of the fluid pressure cylinder, a second pressure accumulator into/out of which the operating fluid flows through a second passage with the expansion/contraction operation of the fluid pressure cylinder, and a shut-off switch configured to shut off the first passage and configured to shut off the second passage if at least either one of a right boom and a left boom is not at a working position expanded in a right-and-left direction of the working vehicle.. . ... Kyb Corporation

06/08/17 / #20170159639

Hydraulic rotary machine

A hydraulic piston pump motor in which water is used as a working fluid includes an axial directional passage opened on an end surface of one end of a shaft that couples to a cylinder block and drilled open along a shaft center of the shaft; a first radial directional passage drilled open along a radial direction of the shaft from the axial directional passage and configured to guide working fluid into a casing; a second radial directional passage drilled open from the axial directional passage along the radial direction of the shaft at a position closer to the one end of the shaft than the first radial directional passage; and an introduction passage communicating a passage, through which the higher pressure working fluid flows, among the supply passage and the discharge passage with the axial directional passage.. . ... Kyb Corporation

06/08/17 / #20170159638

Hydraulic rotary machine

A hydraulic rotary machine includes a plurality of pistons, a cylinder block accommodating the pistons, a shaft penetrating through the cylinder block, a swash plate making the pistons reciprocate to expand and contract a capacity chamber of the cylinder, a casing accommodating the cylinder block, a front cover closing an opened end of the casing, an extending portion formed in the front cover and extending along the shaft towards the cylinder block, and a first slide bearing provided between the extending portion and the cylinder block. The first slide bearing is fixed to the extending portion or the cylinder block by a pin member.. ... Kyb Corporation

06/08/17 / #20170158015

Signal processing device, suspension control device, and signal processing method

A damper speed calculation unit 42 reads a suspension displacement and performs a differential operation on it, to thereby calculate a damper speed. This differential operating characteristic includes a gain characteristic having a gradient larger than a gradient of a gain characteristic of an exact differential in an unsprung resonance frequency region. ... Kyb Corporation

05/18/17 / #20170138432

Damper

A damper includes a cylinder, an annular rod guide, an annular seat, a rod, an annular oil seal, a rebound cushion, and a communication passage. The cylinder houses an action chamber. ... Kyb Corporation

05/04/17 / #20170122397

Magnetic rheological fluid shock absorber

A piston of a magnetic rheological fluid shock absorber comprises a piston core that is formed from a magnetic material and is provided with a coil on the outer periphery thereof, and a ring body that is formed from a magnetic material, surrounds the outer periphery of the piston core. A flow path of the magnetic rheological fluid is formed between the ring body and the piston core. ... Kyb Corporation

04/20/17 / #20170106882

Brake apparatus

A brake apparatus includes a first coupling member coupled to one end part of one of a pair of link arms, a second coupling member coupled to the one end part of the other of the pair of link arms to freely advance and retract with respect to the first coupling member, an actuator configured to advance and retract an output member, a lever rotatably coupled to the output member and configured to be rotated by advancing and retracting movements of the output member and a booster unit configured to advance and retract the second coupling member with respect to the first coupling member by boosting a force transmitted by the rotation of the lever.. . ... Kyb Corporation

04/06/17 / #20170096040

Damper control device

A damper control device includes a rate sensor that detects a pitching angular velocity of a vehicle body, a vehicle speed sensor, a steering angle sensor and a calculation unit that detect a roll angle and a yaw angular velocity of the vehicle body, a pressure sensor that detects a pressure of a contraction-side chamber in a front-wheel side damper, a pressure sensor that detects a pressure of a contraction-side chamber in a rear-wheel side damper, and a correction unit that corrects the pitching angular velocity. The pressures are controlled on the basis of the corrected pitching angular velocity and the pressures. ... Kyb Corporation

03/30/17 / #20170089419

Dust boot, method of manufacturing dust boot, and shock absorber

A dust boot includes a tubular boot body and an annular flange portion linked to an upper end of the boot body. In an outer side of the flange portion, an angle between the flange portion and a line perpendicular to an axis of the boot body is set to be larger than 0° and smaller than 90°.. ... Kyb Corporation

03/23/17 / #20170080958

Brake apparatus

A brake apparatus includes a pair of link arms having supporting portions between one end parts and other end parts rotatably supported on a brake main body, a lever configured to rotate by advancing and retracting movements of an output member of an actuator and a booster unit provided on at least one of the one end parts of the link arms and configured to rotate the link arms with the supporting portions as fulcrums by boosting a force transmitted by the rotation of the lever.. . ... Kyb Corporation

03/23/17 / #20170080769

Damper control device

The damper control device includes a three axis rate sensor that detects a pitching angular velocity of a vehicle body of a two-wheeled vehicle, a pressure sensor that detects a pressure of a contraction-side chamber in a front-wheel side damper, a pressure sensor that detects a pressure of a contraction-side chamber of a rear-wheel side damper, and a correction unit that corrects the pitching angular velocity. The damper control device controls the pressure of the contraction-side chamber in the front-wheel side damper and the pressure of the contraction-side chamber of the rear-wheel side damper on the basis of the corrected pitching angular velocity, the pressure of the contraction-side chamber in the front-wheel side damper and the pressure of the contraction-side chamber of the rear-wheel side damper.. ... Kyb Corporation

03/23/17 / #20170080768

Shock absorber

A shock absorber includes a shock absorber body, a suspension spring, a spring seat, and a spring rubber seat. The seat surface of the spring rubber seat is formed inclined so as to be higher toward a distal end within a predetermined range from the distal end where a spiral portion of the suspension spring becomes apart to a side where the spiral portion of the suspension spring abuts. ... Kyb Corporation

03/16/17 / #20170074344

Damper

A damper includes a tubular member that internally forms an action chamber, an annular rod guide secured to one side opening of the tubular member, a rod inserted through an inside of the rod guide so as to be axially movable, an oil seal installed to the action chamber side of the rod guide and seal an outer periphery of the rod, and a sealing member stacked on a side of the rod guide opposite to the action chamber, wherein the sealing member includes a dust seal that seals the outer periphery of the rod, and an outer peripheral seal that seals a gap between the tubular member and the rod guide.. . ... Kyb Corporation

03/16/17 / #20170074292

Fluid pressure control device for construction machine

A fluid pressure control device for a construction machine includes a first circuit system connected to the first pump; a second circuit system connected to the second pump; a switching valve having a normal position, a straight traveling position and a merging position where the working fluid of the branch section is merged into the second neutral passage; and an open/close mechanism configured to open/close the first neutral passage. In a case where at least one of the control valves, on which merging is required, on the downstream of the second traveling control valve is switched to a position other than the neutral position, by closing the first neutral passage by the open/close mechanism and switching the switching valve to the merging position, the working fluid of the first pump is merged into the working fluid of the second pump.. ... Kyb Corporation

03/16/17 / #20170074235

Hydraulic rotating machine

A hydraulic rotating machine adapted to be actuated and rotated by supply and discharge of a working fluid includes a cylinder block to which a shaft is coupled, the cylinder block being configured to be rotate together with the shaft; a cylinder formed to have an opening portion on one end side of the cylinder block, a recessed portion being formed on an inner circumference of the cylinder; and a bush inserted from the opening portion of the cylinder and provided on the inside of the cylinder, the bush having a projection portion filled into the recessed portion by plastic deformation. The recessed portion is formed in such a manner that width along an axial direction of the cylinder becomes smaller toward the depth direction.. ... Kyb Corporation

03/16/17 / #20170072762

Damper control device

A damper control device feeds back a pressure within an extension-side chamber to control an extension-side solenoid valve that adjusts the pressure within the extension-side chamber, and feeds back a pressure within a compression-side chamber to control a compression-side solenoid valve that adjusts the pressure within the compression-side chamber. The damper control device performs a compression-side reduction correction which reduces a compression-side current supplied to the compression-side solenoid valve during extension of a damper, and performs an extension-side reduction correction which reduces an extension-side current supplied to the extension-side solenoid valve during contraction of the damper.. ... Kyb Corporation

03/09/17 / #20170067528

Manufacturing method for shock absorber

A rotation lock is provided to a piston rod, a collar is fitted on a small-diameter portion disposed on an end portion on a side of the piston rod extending from a cylinder, and the collar is press-fitted onto a press-fitted portion disposed on the piston rod by a press-fitting jig screwed with an external thread formed on the small-diameter portion. The press-fitting jig adds an axial force to the collar.. ... Kyb Corporation

03/09/17 / #20170067527

Cylinder device

A cylinder device includes a cylinder, an outer tube, a piston, a piston rod, a rod guide, a first common passage through which working oil that is supplied/discharged to/from a rod-side chamber passes, a pipe that forms a part of the first common passage and is provided in a reservoir tank, a pipe holder that is provided between the pipe and the rod guide and holds a first end of the pipe, and a plug that is provided on a side of the pipe holder opposite from the pipe and has a throttle passage allowing the first common passage to communicate with the reservoir tank.. . ... Kyb Corporation

03/09/17 / #20170067462

Vane pump and vane pump manufacturing method

A vane pump includes a rotor; a plurality of vanes; a cam ring; and a pump body having an accommodating concave portion accommodating the cam ring. The cam ring includes a ring fitting portions formed in a plurality of regions on an outer circumference and a ring small-diameter portions formed on the outer circumference so as to have an outer diameter smaller than those of the ring fitting portions. ... Kyb Corporation

02/09/17 / #20170037922

Damper

A damper includes a cylinder, an annular rod guide, a rod, an annular oil seal, and an annular seal holder. The cylinder internally forms an action chamber. ... Kyb Corporation

02/09/17 / #20170037921

Cylinder device

An object is to provide a cylinder device which can be used over a long period of time. The cylinder device includes a damper, a pump, a motor and an external tank. ... Kyb Corporation

01/26/17 / #20170023086

Cylinder device

A cylinder device includes a recess provided on either one of the piston and the cylinder, the recess facing the other one of the piston and the cylinder; an extension-side discharge passage configured to permit only a flow of liquid from the extension-side chamber toward the recess; a compression-side discharge passage configured to permit only a flow of liquid from the compression-side chamber toward the recess; a tank-side discharge passage configured to allow the extension-side discharge passage and the compression-side discharge passage to communicate with the tank through the recess; an extension-side damping force generation passage configured to apply a resistance to a flow of liquid passing therethrough so as to exert a damping force during extension; and a compression-side damping force generation passage configured to apply a resistance to a flow of liquid passing therethrough so as to exert a damping force during contraction.. . ... Kyb Corporation

01/26/17 / #20170022688

Fluid pressure control device

A fluid pressure control device includes a load holding mechanism that is configured to hold the load pressure of the load side pressure chamber. The load holding mechanism includes a switching valve having a communication passage configured to be blocked from the third pressure chamber by the second land section in a case where the spool is closed, and providing communicate between the second supply port and the discharge port in accordance with the movement of the spool in the valve opening direction. ... Kyb Corporation

01/26/17 / #20170020121

Boom vibration control device and boom sprayer

A boom vibration control device includes a fluid pressure cylinder provided between a boom and a boom support body, the fluid pressure cylinder biasing the boom in one rotating direction and a metal spring provided between the boom and the boom support body, the metal spring biasing the boom in the other rotating direction.. . ... Kyb Corporation

01/19/17 / #20170019000

Rotating electric machine

A rotating electric machine with a stator unit having a coil wound therearound includes a busbar unit assembled with the stator unit and having a winding end part of the coil connected thereto, and a thermistor for detecting a temperature of the coil. The busbar unit includes a fixing portion for pressing and fixing the thermistor to the coil.. ... Kyb Corporation

01/19/17 / #20170016507

Cylinder device

A cylinder device includes an annular cushion ring that prevents collision between the cylinder head and the rod head at stroke end during contraction. The cushion ring is formed by linking a plurality of ring segments in a circumferential direction so as to have an annular shape. ... Kyb Corporation

01/19/17 / #20170016505

Cylinder device

A cylinder device includes a piston rod that is inserted into a cylinder so as to be movable back and forth. The piston rod has a rod portion that extends outside the cylinder, and a piston connected to an end portion of the rod portion, the piston moving in the cylinder in a slidable manner. ... Kyb Corporation

01/19/17 / #20170016432

Piston pump and valve plate of piston pump

A piston pump configured to suction and discharge a working fluid includes a plurality of pistons, a cylinder block accommodating the pistons, a shaft combined with the cylinder block, swash plate configured to reciprocate the pistons in accordance with rotation of the cylinder block, a casing accommodating the cylinder block, and a valve plate placed between the cylinder block and the casing. The valve plate has a suction port providing communication between capacity chambers and a suction passage, and the suction port is a cutout part formed by cutting out an outer edge of the valve plate.. ... Kyb Corporation

01/19/17 / #20170015384

Front fork

A front fork includes a pair of telescopic tube members and an upper bracket on an upper side and an under bracket on a lower side. The upper bracket and the under bracket couple vehicle body side tubes of the pair of tube members and couple the vehicle body side tubes to a vehicle body side. ... Kyb Corporation

01/19/17 / #20170015140

Caster unit

A caster unit includes a base member attached to a mobile body; a link mechanism rotatably supported by the base member to be capable of swinging up and down; an axle supported by the link mechanism; and a support mechanism provided between the axle and the base member, the support mechanism being configured to extends/contracts in a direction parallel to a tangent line of a trajectory of the axle that swings by the link mechanism to generate a damping force and a restoring force.. . ... Kyb Corporation

01/12/17 / #20170009900

Relief valve

A relief valve comprises a ball body separated from a seat member when a pressure of a working oil from a supply passage exceeds a set pressure, and a ball-body support member biased by a biasing member and supporting the ball body. The ball-body support member comprises a holding recess portion for holding the ball body and a taper portion formed around the holding recess portion and inclined so as to become deeper toward the holding recess portion.. ... Kyb Corporation

01/12/17 / #20170009430

Working machine control system

A working machine control system includes: a split-flow fluid pressure pump configured to discharge a working fluid from a first discharge port and a second discharge port; a communication switching valve configured to be switched by a switch signal when any one of a first operation valve and a second operation valve is switched so as to allow a first neutral passage and a second neutral passage to communicate with each other; a neutral cut valve configured to be switched by the switch signal so as to block communication between a tank and one of the first neutral passage and the second neutral passage for the first operation valve or the second operation valve that is not switched; and a discharge flow rate adjusting device configured to adjust the fluid pressure pump so as to reduce a discharge flow rate thereof when the switch signal is inputted from any one of the first operation valve and the second operation valve.. . ... Kyb Corporation

01/12/17 / #20170009429

Working machine control system

A working machine control system includes: a split-flow fluid pressure pump configured to discharge a working fluid from a first discharge port and a second discharge port; a communication switching valve configured to allow, when one of a first operation valve and a second operation valve is switched, the first discharge port or the second discharge port for one of the first operation valve and the second operation valve that is not switched to communicate with a first neutral passage or a second neutral passage for the other of the first operation valve and the second operation valve that is switched; and a discharge flow rate adjusting device configured to adjust the fluid pressure pump so as to reduce a discharge flow rate of the fluid pressure pump in a case where a switch signal is inputted from any one of the first operation valve and the second operation valve.. . ... Kyb Corporation

01/05/17 / #20170002937

Directional control valve

In a directional control valve, working fluid to be supplied to a first pressure chamber is supplied to the first pressure chamber via a hydrostatic bearing provided on an end of a main spool on the first pressure chamber side, and working fluid to be supplied to a second pressure chamber is supplied to the second pressure chamber via a hydrostatic bearing provided on an end of the main spool on the second pressure chamber side, and a pilot valve alternately communicates the first pressure chamber and the second pressure chamber with a tank.. . ... Kyb Corporation

01/05/17 / #20170002840

Fluid pressure system, pressure accumulation method of accumulator, and operation method of fluid pressure actuator

A fluid pressure system includes a first fluid pressure pump configured to discharge a working fluid that operates fluid pressure actuators, a second fluid pressure pump provided in parallel to the first fluid pressure pump and configured to discharge a working fluid, an accumulator capable of accumulating the working fluid discharged from the second fluid pressure pump, and a first switching valve configured to supply the working water accumulated in the accumulator to the fluid pressure actuator when the first switching valve is switched to an opened state.. . ... Kyb Corporation

01/05/17 / #20170002807

Electric pump

An electric pump includes a pump configured to suck, pressurize and discharge working fluid, a motor coupled with the pump and configured to drive the pump, a motor controller arranged laterally to the motor and configured to control the drive of the motor, and a cooling unit arranged between the motor and the motor controller and configured to cool the motor controller by a refrigerant circulating inside. The cooling unit includes a raised portion projecting into an inner space of the motor controller and formed with a flow passage for the circulation of the refrigerant inside.. ... Kyb Corporation

01/05/17 / #20170002547

Operation state detection system of work machine and work machine

An operation state detection system of a work machine includes a recognition portion provided on a work portion, an image pickup device provided on a work machine body portion and configured to pick up an image of the work portion, a calculation portion configured to calculate change amounts when the shapes of the recognition portions in the image picked up by the image pickup device change with the operation of the work portion, and a detection portion configured to the operation state of the work portion on the basis of the change amounts calculated by the calculation portion.. . ... Kyb Corporation








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