| 摘要 |
A ball bearing including inner and outer rings with a plurality of balls interposed therebetween accommodated in pockets (3) of a retainer. An internal surface of each pocket comprises outer portions (3a) adjacent elastic claws (4) of the retainer, inner portions (3b) each of which follows on from a respective one of the outer portions (3a) and a bottom portion (3c) which extends between the inner portions (3b). Each outer portion (3a) curves in two directions with a radius of curvature slightly larger than that of the ball. Both inner portions (3b) and the bottom portion (3c) is straight in a direction extending around a periphery of the pocket but curved in a direction perpendicular to this which is radially disposed relative to the bearing as a whole. The ball tangentially contacts the inner and bottom portions (3b, 3c) and substantially triangular oil reservoirs are formed at opposite ends of each inner portion (3b). <IMAGE> |
