| 摘要 |
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 % < Rmr (10%) ‰¤ 10 %, a Kurtosis Rku of a roughness profile of the outer surface is set to 4 ‰¤ Rku ‰¤ 10, an arithmetic mean roughness Ra of the outer surface is set to 0 < Ra ‰¤ 0.15, and a compression stress S of the outer surface is set to 800 MPa ‰¤ S ‰¤ 1,100 MPa. |
