| 摘要 |
PROBLEM TO BE SOLVED: To reduce cost by reducing the number of part items. SOLUTION: An air vent 20 having a labyrinth-shaped cross section is directly formed in a cap 11 closing the open end of a reservoir chamber 9 which holds a piston 10 and a compression coil spring 19. The air vent 20 prevents muddy water from entering a spring compartment 13, while venting the spring compartment 13 to the atmosphere. |
