| 摘要 |
PROBLEM TO BE SOLVED: To perform feeding and discharging of grease to and from each pocket smoothly and to reduce resistance to the rolling of a ball in each pocket. SOLUTION: The inside of each pocket 9a, 9a is constructed by a conical part 12 and a cylindrical part 13. Recessed parts 14, 14 are formed at aligned positions with each pocket 9a, 9a on the peripheral surface. The both opened end parts of each pocket 9a, 9a are widened while keeping rigidity of a main part 8a. And the facing area of the inside of each pocket 9a, 9a and the rolling surface of a ball is narrowed. |
