Resin keeper for rolling bearing

Abstract

Provided is a resin-made ball retainer for a rolling bearing wherein improvement is made to the lubrication in a region between an inner surface of each of pockets and a corresponding ball to thereby suppress generation of vibrations and noises due to friction in that region, the resin-made ball retainer includes a plurality of pockets (3) defined in a plurality of portions of a ring-shaped or arcuate retainer body (1) so as to open at the inner and outer peripheral surfaces thereof for rollingly retaining corresponding balls (2) therein. Radial sides of an inner surface of each of the pockets (3) that are opposite to each other in a radial direction of the ball retainer are defined as spherical ball bearing surfaces (5) to which each ball contacts. Also, intermediate portions of the inner surface of each pocket with respect to the radial direction are defined as circumferential non-contact surface areas (6) where the corresponding ball (2) does not contact. All edges of the ball bearing surfaces on the inner surface of each pocket (3), which may contact the ball (2), are defined as chamfered edges.

Description

technical field [0001] The present invention relates to a resin cage for rolling bearings suitable for ultra-thin ball bearings in which the difference between the outer diameter and inner diameter is much smaller than the outer diameter, and general deep groove ball bearings. Background technique [0002] In the past, the cage consisted of a single curved hole whose curvature radius was slightly larger than the outer diameter of the rolling element. The gap between the pocket surface and the rolling elements is set to be small. [0003] In addition, conventional cages have been proposed in which various measures as described below have been taken. [0004] In the example of Japanese Patent Application Publication No. 82424 / 1998, at least a part of the periphery of the hole opening is chamfered, and the cross-sectional shape of the chamfer is a curved surface of an arc. The radius of curvature of the chamfered section shape is 1 to 20% of the outer diameter of the rolling ...

AI Technical Summary

Problems solved by technology

As a result, the lubricity of the sliding contact portion between the cage and the rolling elements deteriorates, and vibration and noise due to friction at this portion are likely to occur.

[0009] In addition, during the operation of the bearing, since the peripheral edge of the hole scrapes the lubricant attached to the rotating rolling element, the lubricity between the rolling element and the inner surface of the hole becomes poor, and vibration noise caused by friction in this part is likely to occur.

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