| 摘要 |
PURPOSE:To improve the durability of a sealing member and reduce the number of parts so as to secure fixation of a retainer member, by making such a constitution that the sealing member makes contact with the periphery of an inner tubular member and the retainer member is pressed in onto the inner peripheral face of a rigid sleeve member. CONSTITUTION:A sealing member 9 is so constituted that it makes contact with the peripheral face of an inner tubular member 1, and a retainer member 8 is pressed in onto the inner peripheral face of a rigid sleeve member 6; the diametral size of the sealing member 9 can be shortened in its sealing position as a result, and the moving quantity of the sealing member 9 is reduced in its sealing position, so that the durability of the sealing member 9 can be improved and also the number of parts can be reduced. And if the retainer member 8 is even in width in its axial direction, the touching area of its press-in portion is larger than in the case when it is pressed in onto the peripheral face of the inner tubular member 1; its press-in area becomes larger. Falling preventing force for the retainer member 8 may thus be enhanced. |
