| 摘要 |
PURPOSE: To reduce the number of production processes for a rear shell and to easily comply with a change of a key member by extending a holding member in the axis direction so as to cover the key member, bending the end part of the holding member to the outer circumference, and fixing an inner circumferential end, which is bent in the axial direction, of the rear shell in the end part of the holding member. CONSTITUTION: A seal member 23 is tightly brought into contact with the back faces in both end parts of a key member 41, and a holding member 24 arranged between a boot 42 and the seal member 23 is coveringly arranged above and below the key member 41. In the holding member 24, one end is arranged between the seal member 23 and the boot 42, while the other end is extended in the axial direction and is bent in the circumference direction while covering the key member 41. In the bent end part, an inner circumference end, which is bent in the axial direction, of a rear shell 13 is force fitted so as to be fixed. For complying with a positional alteration of the key member 41, no alteration of the rear shell is required, but an alteration of the holding member 24 facilitates it, so that production processes for the rear shell 13 can be reduced. |
