| 摘要 |
A retainer for a ball bearing being characterized in that each pocket includes upper halves following the entrance, a pair of lower halves following the upper halves, and a bottom portion disposed between lower halves, wherein an inner peripheral surface of each upper half presents a curved surface of a radius of curvature slightly larger than that of the ball to be retained therein in both peripheral and width directions of the pocket, an inner peripheral surface of each lower half descending inwardly, the inner peripheral surface of each lower half and an inner surface of the bottom portion each presents a configuration which has a shape of curved surface in the width direction of the pocket and of a straight shape in the peripheral direction of the pocket so as to contact tangentially with the ball so as to contact tangentially with the ball to be retained.
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