Ball bearing retainer and ball bearing

摘要

A ball bearing retainer includes two annular members that face each other in an axial direction. The two annular members have opposed surfaces each including hemispherical pockets that are formed at a plurality of positions in a circumferential direction and configured to receive balls. The opposed surfaces are snap-fitted to each other so as to couple the two annular members to each other with coupling portions provided at both circumferential end portions of each of the hemispherical pockets Inner peripheral surfaces of the hemispherical pockets of the two annular members and the opposed surfaces of the two annular members have recessed grooves that are opened by extending from radially inner surfaces of the two annular members and reaching radially outer surfaces of the two annular members.

主权项

1. A ball bearing retainer comprising two annular members that face each other in a bearing axial direction,
the two annular members having opposed surfaces each comprising hemispherical pockets that are formed at a plurality of positions in a circumferential direction of the 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 with coupling portions provided at both circumferential end portions of each of the hemispherical pockets, wherein the hemispherical pockets each comprise lubricating-oil relief recessed grooves provided in an inner peripheral surface thereof, wherein the coupling portions each comprise: a radially outer side projecting portion formed by axially extending a radially outer side of the circumferential end portion of each of the hemispherical pockets of one of the two annular members so as to allow an inner peripheral surface of the radially outer side projecting portion to abut against the balls; a radially inner side recessed portion formed by recessing a radially inner side of the circumferential end portion; a radially inner side projecting portion formed by axially extending a radially inner side of the circumferential end portion of each of the hemispherical pockets of another of the two annular members so as to allow an inner peripheral surface of the radially inner side projecting portion to abut against the balls; and a radially outer side recessed portion formed by recessing a radially outer side of the circumferential end portion, wherein the radially outer side projecting portion and the radially inner side projecting portion are engaged with each other in the bearing axial direction b inserting the radially outer side projecting portion into the radially outer side recessed portion and by inserting the radially inner side projecting portion into the radially inner side recessed portion, and wherein an engagement surface of the radially outer side projecting portion and an engagement surface of the radially inner side projecting portion are inclined with respect to the bearing axial direction in a manner that the radially outer side projecting portion and the radially inner side projecting portion are each thicker on a distal end side than on a proximal end side.