Abstract:
A cam follower includes a roller on which a cam rolls. A material ratio Rmr (C) (C: a section level %) of an radially outer surface of the roller is set to relations of 0 %
Abstract:
A rocker arm bearing comprising a support shaft in which end faces of shaft end portions of the support shaft are crimped to inner circumferential edges of shaft end inserting holes in opposed side walls and an outer ring which is rotatably supported on a raceway portion at a shaft intermediate portion of the support shaft via a plurality of rollers or directly, wherein an external surface of the raceway portion at the shaft intermediate portion of the support shaft is surface hardened by virtue of quenching, and as a wear-resistant hard coating, a DLC coating is formed on at least the external surface of the raceway portion which is surface hardened.
Abstract:
A cam follower includes a roller on which a cam rolls. A material ratio Rmr (C) (C: a section level %) of an radially outer surface of the roller is set to relations of 0%
Abstract:
There is provided a cam follower in which a surface roughness of an outer surface of a roller of a cam follower which is in rolling contact with a cam of an engine is obtained individually in an axial direction and a circumferential direction, a skewness Rsk of a profile is formed to be negative, a core roughness depth Rk is made to be 0.3 or less, a reduced valley depth Rvk is made to be 0.3 or less, and a ratio Rk/Rt of the Rk to a maximum height Rt of the profile is made to be 0.19 or more.
Abstract:
The invention provides a cam follower having an outer ring which is used in a state where the cam follower comes into sliding contact or rolling contact with a mating part. The outer ring is configured such that the hardness of a surface layer portion existing between the surface and at least 3 μm below the surface is Hv 780 to 900, and the hardness of an internal surface portion existing at a depth of 10 μm or more from the surface is lower than the hardness of the surface layer portion and less than Hv 780. Such hardness can be obtained by performing soft shot blasting or flow barrel processing on a surface layer portion of a base material to be the outer ring.
Abstract:
There is provided a cam follower in which a surface roughness of an outer surface of a roller of a cam follower which is in rolling contact with a cam of an engine is obtained individually in an axial direction and a circumferential direction, a skewness Rsk of a profile is formed to be negative, a core roughness depth Rk is made to be 0.3 or less, a reduced valley depth Rvk is made to be 0.3 or less, and a ratio Rk/Rt of the Rk to a maximum height Rt of the profile is made to be 0.19 or more.
Abstract:
The bearing devices includes a pair of opposed sidewalls, a supporting shaft which is inserted into shaft end insertion holes provided in the both opposed sidewalls, and a roller supported between the both opposed sidewalls by the supporting shaft. The supporting shaft includes a shaft main body that is made of a steel product subjected to a heating process and has a step shape in which the outer diameters of the both shaft ends are smaller than that of a middle portion and caps which is fitted to the both shaft ends and of which the end can be caulked. An end outer-diameter side edge of the cap is caulked to an inner-diameter side edge of the insertion hole.
Abstract:
A split bearing which is divided in two is formed of a rolling bearing, and its outer ring is provided with ribs at both side parts thereof in an axial direction. An integrating mechanism is provided at a position within a range in the axial direction where this rib is formed. The integrating mechanism include a concave groove in an annular shape which is formed on a side surface of the rib, and a C-shaped ring is engaged with this concave groove, whereby upper and lower split outer ring pieces of the divided outer ring are integrated into a preassembled state.
Abstract:
A step portion is formed at an outer peripheral surface of an axially-central portion of an outer ring, and is smaller in diameter than outer peripheral surfaces of axial opposite end portions of the outer ring. The step portion is continuously formed over an entire periphery of the outer ring, and has a predetermined width over the entire periphery. The outer peripheral surface and inner peripheral surface of the outer ring are pressed radially inwardly, and therefore are bulged radially inwardly into a step-like shape to form the step portion having an axis coinciding with a axis of the outer ring. A pedestal of a cylinder block and a cap member retain the outer peripheral surface of the step portion, thereby positioning the outer ring in the axial direction and also preventing a movement of the outer ring in the axial direction.
Abstract:
The bearing device 4 is press-fitted between the inside surface of the axis insertion hole of a steering column and the outside surface of a steering axis inserted into the axis insertion hole so as to support the steering axis. The bearing device 4 comprises a roller bearing arranged on the outside surface of the steering axis and a spacer ring arranged between the outside surface of the roller bearing and the inside surface of the axis insertion hole. The spacer ring comprises a wall thickness holding unit for holding the thickness of its wall in the radius direction and a thickness reduction unit which is provided on at least one site of the inside and outside surfaces and its end in the vicinity of the wall thickness holding unit and which reduces the thickness of the wall to facilitate deformation of the spacer ring.