| 摘要 |
Durability of a pair of inward flange portions 4 b and 4 c formed on both ends of a shell 1 c is ensured while maintaining load capacity, irrespective of a thrust load applied from each needle 2 a. Inside surfaces 10 a and 10 b of both inward flange portions 4 b and 4 c are formed as inclined surfaces inclined in a direction where a distance between the surfaces increases toward the radial inward direction. Each of both axial end surfaces of the needle 2 a is constructed from a beveled portion 8 on an outer peripheral edge and a flat surface portion 9 . The structure prevents a large moment load from being applied to base end portions of the inward flange portions 4 b ( 4 c) even when end surfaces of the needles 2 a are abutted against an inside surface 10 a ( 10 b) of an inward flange portion 4 b ( 4 c) by a thrust load. |
