Jtekt Corporation

Shinya Ochi

Yoshitaka Waseda

Junji Murata

Kazutoshi Toda

Toshiyuki Saito

Kazuyoshi Yamakawa

A bearing apparatus includes: two split outer ring halves which are mounted to the housing; a plurality of rolling elements which are provided so as to roll on the two split outer ring halves; and a cage which holds the rolling elements such that the rolling elements are disposed at substantially equal intervals in a circumferential direction of the cage and which is split at a position of the cage to form joint surfaces, an outside diameter of the cage being guided by inner circumferential surfaces of the split outer ring halves. An outside diametrical dimension in a normal direction to the joint surfaces is made larger than an outside diametrical dimension of the cage in a direction parallel to the joint surface, and vicinity of an outside diametrical position of the cage lying in the normal direction is made to be guided by the outer ring halves.

Bearing apparatus

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%&#x3c;Rmr (10%)&#x2266;10%, a Kurtosis Rku of a roughness profile of the outer surface is set to 4&#x2266;Rku&#x2266;10, an arithmetic mean roughness Ra of the outer surface is set to 0&#x3c;Ra&#x2266;0.15, and a compression stress S of the outer surface is set to 800 MPa&#x2266;S&#x2266;1,100 MPa.

Cam follower

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.

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Hamura, Japan

Shinya Ochi