| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a retainer for a ball bearing capable of stably maintaining its rigidity and rotating smoothly with constant accuracy without damage over a long period of time even under a high-speed rotation environment, and to provide a ball bearing. <P>SOLUTION: The retainer 10 for a ball bearing is assembled in the ball bearing including raceway rings and a plurality of balls so as to retain the balls in pockets 8. Plate-like flat portions 2 each having a through hole 2h and concave portions 4 each concaved in a substantially semi-spherical shape from the flat portions are alternately connected so as to form an annular retainer constituent element 20. Two retainer constituent elements are arranged face to face in such a manner that the respective concave portions are depressed in reverse directions to each other and the through holes of the respective flat portions communicate with each other. The two retainer constituent elements are fixedly combined with each other by fixing members 6 inserted in the through holes and the substantially spherical spaces defined by the facing concave portions are circumferentially arranged at certain intervals, thereby constituting the pockets. When the shortest distance between the outer circumference of the retainer constituent element and the peripheral edge of the through hole is shown by d1 and the shortest distance between the inner circumference of the retainer constituent element and the peripheral edge of the through hole is shown by d2, d1 and d2 are so set as to fulfill the following formula: d1<d2. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
