| 摘要 |
A twin-pipe shock absorber comprises a working cylinder (1), a piston (4) which is movable in the cylinder and has a passage and upstream valve (13, 14, 15). Round the working cylinder an external pipe (2) is fitted and an oil tank (3) is present between the working cylinder and the external pipe. The working cylinder is shut off by a disc (7) having a passage (16) and an upstream valve (17) positioned near said passage. Further the absorber is provided with a damper valve. To produce a shock absorber in which the shock absorption can be adapted very rapidly to the frequency of movement of the unsprung wheel guide part a central pipe (10) extends through the piston (4) and with its bottom end projects through said disc (7). The damper valve is disposed at the bottom end of said central pipe (10), and regulation means are present to regulate the damping exerted by the damper valve depending at least on the frequency at which the working cylinder vibrates. |
