CROWN-SHAPED RETAINER FOR DEEP-GROOVE BALL BEARING, AND DEEP-GROOVE BALL BEARING

摘要

A crown-shaped retainer (20) for a deep-groove ball bearing, wherein a plurality of pockets (30) comprise: first pockets (31) that are each formed between column portions (22) that comprise hook portions (23); and second pockets (32) that each have a pair of side walls (24) that are respectively formed in adjacent column portions (22), and a flat bottom portion (25) that is formed in an annular portion (21). A minimum thickness Ts of the annular portion (21) in the first pockets (31), and a bottom portion thickness Tc of the annular portion (21) in the second pockets (32), satisfy TsTc. Thus, the retainer is configured to be supported in the axial direction, the number of balls therein can be increased, and, even if a burr occurs, the behavior of the balls is not affected.