Patent ID: 9103374
Filing Date: 2015-08-11
Classification: F16C

Abstract:
1. A retainer for a ball bearing, comprising two annular members that face each other in an axial direction thereof, the two annular members each having an opposed surface comprising hemispherical pockets that are formed at a plurality of positions in a circumferential direction of each of the two annular members and configured to receive balls, the opposed surfaces being snap-fitted to each other so as to couple the two annular members to each other, wherein the hemispherical pockets each have an inner peripheral surface including a ball contact surface and a ball non-contact surface, wherein the ball contact surface is formed at a central portion in a pocket circumferential direction of the inner peripheral surface of each of the hemispherical pockets and at a central portion in a pocket axial direction of the inner peripheral surface, wherein the ball non-contact surface comprises a C-shaped recess comprising parts defined on both sides in the pocket circumferential direction of the ball contact surface; and a part defined on a side of one of the pocket axial ends on a radially outer side of the bearing; wherein the C-shaped recess is recessed to a side opposite to a corresponding one of the balls across the ball contact surface, and wherein the C-shaped recess is opened in one of pocket axial ends on the radially outer side of the bearing.