| 摘要 |
PROBLEM TO BE SOLVED: To increase endurable load by increasing the number of rollers without increasing size of the rollers with a retainer. SOLUTION: A cylindrical retainer 2 includes a plurality of rollers each having recessions (engagement parts) on axially both ends. The retainer 2 has circular portion 6 having a plurality of pockets in a circumferential direction, and a pair of walls 7 respectively extending from axial both ends of the circular portion 6 and opposed to each other in an axial direction. Projections (retaining part) 8 are formed on the respective walls 7 so as to engage with the recessions of the rollers and rotatably retain the rollers between the opposed walls 7. |
