| 摘要 |
PROBLEM TO BE SOLVED: To provide a compound pivotaly, in which parts are already assembled mutually, used for the swing arm of a hard disc drive device as it is in an user. SOLUTION: An inner periphery rotating groove 2a is formed on the outer periphery of the large diameter part of two steps shaft 1 having the large diameter part 1a and a small diameter part 1b and balls 4 are arranged between this inner periphery rotating groove 2a and an outer periphery rotating groove 2b formed on the inner periphery surface of the outer race 3 of the large diameter part side and the inner race 5a of the ball bearing is fitted to the small diameter part 1b of the two steps shaft by that the small diameter parts 7a, 7b fitted to respective insides of the outer race of the large diameter part and the outer race of the ball bearing hold a cylindrical spacer 7 formed on both end parts respectively between the outer race 5 of the ball bearing 5 arranged balls 6 between the inner race 5a and the outer race 5b and the outer race 3 of the large diameter part side. |
