Patent ID: 8876395
Filing Date: 2014-11-04
Classification: F16C

Abstract:
1. A ball bearing comprising: an inner race; an outer race; a plurality of balls interposed between the inner race and the outer race; and a retainer for retaining the balls, the retainer comprising an annular retainer body including: wherein the each of the recesses and the corresponding pair of claw portions form a pocket in which a ball of the plurality of balls is received, wherein pocket edge portions of the pockets situated on a radially outer side of the pockets are closer to the balls than pocket edge portions of the pockets situated on a radially inner side of the pockets, whereby a curvature center of the pockets is situated on the radially inner side of the pockets and not at a center of thickness of the retainer, and a pitch circle diameter (PCD) of the pockets, which has a length that is twice as large as a length between the curvature center of one of the pockets and a center of the ball bearing, is smaller than a PCD of the balls, which has a length that is twice as large as a length between a center of one of the balls and the center of the ball bearing, so that the pocket edge portions situated on the radially outer side of the pockets are positioned to scrape off grease that adheres to the balls, and wherein when the PCD of the pockets is 0.9 to 0.99 times as large as the PCD of the balls, a diameter of the pockets is 1.06 times or less as large as a diameter of the balls.