Nsk Corporation

Hisashi Kawamura

Susumu Tanaka

Manabu Ohori

Yukio Ohura

Yukio Ooura

Mineo Kameko

A bearing with a ball contact with a raceway groove of one of an outer ring and an inner ring at one point and the other at two points. The surface of the ball and the surface of the race of the outer ring and the race of the inner ring were provided with a phosphorus-based modified layer. The ball bearing is at a rotary speed as high as not lower than 70 m/s as calculated in terms of V and a load as small as not greater than 0.05 as calculated in terms of Pr/Cr supposing that the dynamic equivalent radial load is Pr, the basic dynamic rated load is Cr, one of the inner ring and the outer ring is a driving ring and the slip rate of the ball to the one of the inner ring and the outer ring as a driving ring is V.

Rolling bearing

A fine nitride layer comprising a compound layer and a diffusion hardened layer of hardness being Hv900 or higher is formed, through a low temperature nitriding method at temperature in the range of 300 to 400&deg; C., in a guiding part. The guiding part guides the circumferential surfaces of retainers to and is formed at any one part of inner ring raceways to and outer ring raceways to as well as the inner circumferential surfaces of the outer rings to , to thereby realize such rolling bearings at low cost, having excellent abrasion resistance, and good corrosion resistance, if needed.

Growing community of inventors

Kanagawa, Japan

Hisashi Kawamura