| 摘要 |
A mechanical part having a rolling contact surface (11a) with many isolated minute recesses. A maximum height Ry of a roughness curve R obtained by cutting this contact surface (11a) with a plane perpendicular thereto is 1-3 mu m. An attenuation peak height RPK obtained on the basis of a load curve M obtained from the roughness curve R has relation of RPK/Ry </= 0.1 with respect to the maximum peak height Ry. This indicates that the contact surface has minute recesses of a low distribution and a large depth, and that the portion of the contact surface layer which is close to the upper surface thereof is comparatively smooth. This smooth portion close to the upper surface enables a sufficiently wide contact surface area to be secured, and oil reservoirs of sufficiently large capacity to be formed owing to the minute recesses of a low distribution and a large depth. |
