To provide a cage for bearing which restricts a revolution component of a rolling body among NRRO, while securing a flow of the lubricant between a pocket surface and the rolling body.
A pocket 20 of the cage 10 is formed of an inside pocket surface 22, an intermediate pocket surface 28 and an outside pocket surface 34. The inside pocket surface 22 and the outside pocket surface 34 are respectively formed of two spherical pocket surfaces, of which center of curvature is displaced from each other, and the intermediate pocket surface 28 is formed of two cylindrical pocket surfaces, of which center axis are displaced from each other. A ratio of the minimum value δHmin of a clearance δH in the circumferential direction formed between the inside pocket surface 22 and the outside pocket surface 34 and a rotating surface of the rolling body in the non-load condition to a rotation diameter DB of the rolling body is set in a range at 0.01-0.02 to structure the cage 10 for bearing.
TAKESHIMA YOSHIKI
Yoshiaki Naito
Cui Shu Tetsu