Patent ID: 8944693
Filing Date: 2015-02-03
Classification: F16C

Abstract:
1. A rolling bearing cage of a ball guided type, the cage comprising a plurality of pockets provided at given intervals in a circumferential direction to retain a plurality of balls respectively, wherein each pocket of the cage comprises a cylindrical surface formed by a cylindrical shape having a center line extending in a radial direction, and at least one tapered surface contiguous with the cylindrical surface on a radially inner side or a radially outer side of the cylindrical surface and extending away from the cylindrical surface in the radial direction and toward the center line; wherein a radial displacement of the cage is regulated by a contact of the ball with the tapered surface, and wherein, in a state in which the ball is in contact with the tapered surface, an angle formed by an imaginary line extending through a center of the ball and a contact point between the ball and the tapered surface, and an imaginary perpendicular plane extending through the center of the ball and perpendicular to the radial direction, is larger than a friction angle defined by a friction coefficient at the contact point between the ball and the tapered surface.