| 摘要 |
A method includes a grinding step of forming the shape of a contact surface, a grooving step of roughening the shaped contact surface to form grooves therein, and a contact surface lapping step of lapping the contact surface having the grooves with a lapping film to form oil grooves for holding a lubricant oil. The surface roughness of the contact surface is such that the maximum height roughness Rz is 4 mum or less, the mean length RSm of the roughness profile elements is 30 to 60 mum, the skewness Rsk of the roughness profile is -2.7 to -0.6 (no unit), the reduced peak height Rpk is 0.09 mum or less, and the reduced valley depth Rvk is 0.4 to 1.3 mum.
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