| 摘要 |
<p>A hydraulic shock absorber utilizing variable fluid pressures to change the dampening characteristics of the shock absorber, both during its compression stroke and its recoil stroke. A piston assembly of the shock absorber divides the damping fluid chamber of the shock absorber into a recoil chamber and a compression chamber. The piston assembly carries a recoil valve and a compression valve that control the flow of damping fluid across the piston assembly between the recoil and compression chambers. Pressure of a second fluid introduced into the piston assembly through a passage in the piston rod and biases the recoil and compression valves to closed positions. The pressure of the damping fluid in the compression chamber and in the recoil chamber bias the recoil and compression valves toward their open positions. The pressurized fluid passage in the piston rod is connected, outside the shock absorber, with a source of fluid whose pressure may be selectively varied.</p> |
