Ntn Corporation

Weida Yan

Michio Hori

Takashi Yamamoto

Kazumasa Seko

Naoya Hasegawa

A rolling bearing includes an inner ring, an outer ring, and rolling elements interposed between the inner ring and the outer ring. A surface layer portion, beneath a raceway surface (), of a base material of a raceway ring () which is the inner ring or the outer ring, is a wear-resistant layer () which has a higher hardness than a residual portion (), beneath the surface layer portion, of the base material, and includes a minute-recess-and-projection surface. An oxide film () is provided which has such a film thickness (t) as to fill recesses of the minute-recess-and-projection surface of the wear-resistant layer (), and includes recesses and projections existing along the minute-recess-and-projection surface, and the oxide film () coats the surface of the wear-resistant layer (). The oxide film () is made from a material more fragile than the wear-resistant layer () of the base material.

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Kuwana, Japan

Weida Yan