| 摘要 |
PROBLEM TO BE SOLVED: To provide a retainer for a ball bearing capable of restraining backlash of a ball, capable of reducing viscous shearing resistance between the retainer and the ball, and capable of reducing thereby rotation torque of the bearing. SOLUTION: In this crown-shaped retainer, a recess 7 extended along a radial direction of the retainer is provided in a portion crossed with a retainer rotational direction, in an inner face of each pocket 3, and opposed to a maximum peripheral speed portion 2max of the ball 2. The retainer is constituted to specify a distance between a pocket bottom face 7a of the recess 7 and a ball surface fit in the pocket 3 to 4μm or more to 15% of a ball diameter or less. COPYRIGHT: (C)2011,JPO&INPIT
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