Nsk Corporation

Kazuhiro Fujiu

Takashi Ogawa

Hiroyuki Ito

Susumu Tanaka

Shigeru Okita

Toyohisa Yamamoto

Kazuo Sekino

Banda Noda

Yasushi Mutou

Toshio Matsushima

Akira Uchida

A full complement angular ball bearing with no cage and having a contact angle from 10 to 45&#xb0; and an increased number of balls for use under severe conditions. The life is extended by defining the surface roughness of the inner ring and the outer ring, defining the roughness ratio of them relative to the rolling element, defining the Cr content in the alloy steel for the rolling element, forming the rolling element with oxide ceramics, or providing a dense nitride layer on the surface of the rolling element, avoiding the presence of particles with a mean diameter in excess of 3 &#x3bc;m on the raceway surfaces of the outer ring and the inner ring, or coating a film of a hardness higher than that of the raceway surface of the outer ring and the inner ring on the surface of the rolling element.

Rolling bearing

A cage for ball bearing having pockets 7 the inner surface of which comprises a spherical surface portion 15 and a pair of cylindrical surface portions 16 on the opposite sides of the spherical surface portion 15 connected continuously to the opposite edges of the spherical surface portion 15, the spherical surface portion 15 having a radius of curvature slightly larger than the radius of curvature of the rolling contact surface of the balls to be held in the pockets 7, wherein the area of the spherical surface portion 15 in sliding contact with the rolling surface of the balls is decreased to smoothly supply the pockets 7 with lubricant to decrease the cage sound caused due to friction.

Cage for ball bearing

Growing community of inventors

Yokohama, Japan

Kazuhiro Fujiu