| 摘要 |
A protrusion (30a) on one end of a first retainer element (9a) fits into a recess (41b) in the other end of a second retainer element (9b), and a protrusion (30b) on one end of the second retainer element (9b) fits into a recess (41a) in the other end of the first retainer element (9a). As a result, the relative axial displacement between the first retainer element (9a) and the second retainer element (9b) is prevented. |
