| 摘要 |
PROBLEM TO BE SOLVED: To prevent deterioration of the global environment caused by disposal and leakage of operating oil by making a pneumatic shock absorber applicable especially to a suspension of a vehicle or the like under the environment in which the pneumatic shock absorber is forced to execute expanding/contracting operations in a relatively wide frequency region. SOLUTION: The pneumatic shock absorber K1 is provided with a bypass passage B1 to connect a lower chamber R2 and an upper chamber R1, and a communicating passage L to communicate the upper chamber R1 and the lower chamber R2 with a piston 1 or a piston rod 2. Damping valves V1,V3 and check valves V3, V4 are provided to the bypass passage B1 and the communicating passage L respectively. A little operating oil J to be filled into the pneumatic shock absorber K is made to circulate the upper chamber R1 and the lower chamber R2. As a result, the space between a cylinder 3 and the piston 1 is lubricated. COPYRIGHT: (C)2004,JPO
|
