ROLLER BEARING FOR AUTOMOBILE

摘要

The surfaces (2a) of at least rolling elements (2) of a roller bearing for transmissions or differentials of automobiles are provided with innumerable minute, recess-shaped cavities at random and the surface roughness parameter Ryni of the surfaces provided with the cavities is in the range of 0.4 - 1.0 µ m and the Sk value is not more than -1.6.