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Kabushiki Kaisha Riken patents


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

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


Side rail

A side rail (1) in a sprit ring shape is to be mounted on a space expander (2) and to constitute, together with the space expander (2), a multi-piece oil ring (3) used in an internal combustion engine. The side rail (1) includes an outer peripheral surface (14) facing radially... Kabushiki Kaisha Riken

Side rail

A side rail (1) is formed in a sprit ring shape with an opening (10) and to be mounted on a space expander (2) in an annular shape to constitute, together with the space expander (2), a multi-piece oil ring (3) used in an internal combustion engine. The side rail... Kabushiki Kaisha Riken

Oil ring

An oil ring (1) includes an oil ring body (10) and a coil expander (20). The oil ring body (10) includes a pair of rail portions (12) each including an end portion of an outer periphery having a land (30) formed protruding radially outward from each rail portion (12). The... Kabushiki Kaisha Riken

Piston ring

A piston ring includes an annular main body 2 having a side surface 2a and a side surface 2b, and an inner peripheral surface 2c and an outer peripheral surface 2d, wherein in the main body 2, a cutout section 21 is provided in a corner section 31 formed by... Kabushiki Kaisha Riken

Combined oil control ring

A combined oil control ring comprising a pair of annular side rails each having a gap, and an axially corrugated spacer expander arranged between the side rails; the corrugated spacer expander having on the inside seating tabs for pushing inner peripheral surfaces of the side rails; the side-rail-pushing surface of... Kabushiki Kaisha Riken

Roller-type rocker arm

A roller-type rocker arm had a function for transmitting a rotational motion of a cam to an intake and exhaust valve. The roller-type rocker arm includes a roller shaft, an inner ring roller slidably attached to an outer circumference surface of the roller shaft, and an outer ring roller slidably... Kabushiki Kaisha Riken

Coated sliding member

A coated sliding member 10 for use under an environment where it is in contact with lubricant, comprising: a base material 12; and a first hard carbon layer 14 having a thickness of 3 μm or more formed on a surface of the base material by a vacuum arc method... Kabushiki Kaisha Riken

Sintered valve seat and its production method

To provide a press-fit, sintered valve seat having high valve coolability and wear resistance for use in a high-efficiency engine, and its production method, Cu powder having an average particle size of 45 μm or less and purity of 99.5% or more is used to form a network-connected Cu matrix,... Kabushiki Kaisha Riken

Valve seat of sintered iron-based alloy

The present invention provides a valve seat of a Co-free, sintered iron-based alloy having excellent heat resistance, oxidation resistance and wear resistance, as well as excellent machinability, which is usable for internal combustion engines using a gas fuel. The valve seat is produced by using a prealloy containing 12% or... Kabushiki Kaisha Riken

Seal member

A seal member is made of a composite material. The composite material includes: any one of an acrylic elastomer, a hydrogenated nitrile elastomer, a fluorinated elastomer, and a fluorosilicone elastomer as a main component; and a particulate filler and a fibrous filler. The particulate filler has a mean particle diameter... Kabushiki Kaisha Riken

Roller type rocker arm

A roller-type rocker arm includes a roller shaft. A sliding surface of an outer circumference surface of the roller shaft includes a number of dimples. An inner ring roller is slidably attached to the outer circumference surface of the roller shaft. An inner circumference surface and an outer circumference surface... Kabushiki Kaisha Riken

Piston ring and its production method

To provide a piston ring of low-alloy steel having excellent nitridability, namely, a piston ring of low-alloy steel having excellent thermal conductivity and capable of being provided with a sufficient nitrided layer, steel comprising by mass 0.45-0.65% of C, 0.15-0.35% of Si, 0.65-1.00% of Mn and 0.60-1.10% of Cr as... Kabushiki Kaisha Riken








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