| 摘要 |
PURPOSE: To surely prevent the intrusion of foreign materials into a cylinder opening by stabilizing the sealing force by a lip part, without increasing the number of parts. CONSTITUTION: A dust seal 10 is equipped with the second and the first supporting parts 12 and 11 on the inner and outer peripheries of an annular supporting part body 15. Viewed along the axial direction of a cylinder opening 20, the second supporting part 12 is positioned slightly closer to an opened port part 22 in comparison with the first supporting part 11. Accordingly, the elastic force generated in the first supporting part 11 is transmitted to the second supporting part 12 side, and both the supporting parts 11 and 12 press a lip part 17. |
