Hydraulic shock absorber of damping force adjustable type

Details Hydraulic shock absorber of damping force adjustable type Hydraulic shock absorber of damping force adjustable type

1994-05-19

1996-12-24

Oberleitner, Robert J.

Brakes

Internal-resistance motion retarder

Controlled by an operator remote from retarder

188318, 18832213, F16F 946, B62K 2510

Patent

active

055866271

ABSTRACT:
The present invention is directed to a damping force adjustable hydraulic shock absorber including a cylinder filled with a hydraulic fluid, a piston slidably mounted within the cylinder to divide the interior of the cylinder into two chambers, and a piston rod having one end connected to the piston and the other end extending out of the cylinder. A damping force generating mechanism is provided to communicate between the two chambers and to generate a damping force. A communication passage for communicating one of two chambers in the cylinder with the other chamber and a valve are provided in the communication passage and are adapted to generate the damping force by opening in response to one way flow of the liquid. The shock absorber has a valve opening pressure adjusting mechanism having a back pressure chamber communicating with an upstream portion of the communication passage with respect to the valve. The adjusting mechanism is adapted to change a valve opening pressure of the valve in accordance with a pressure in the back pressure chamber. Also, a relief valve is provided which permits communication between the back pressure chamber and a downstream portion of the communication passage. The relief valve is capable of adjusting the pressure in the back pressure chamber.

REFERENCES:
patent: 4802561 (1989-02-01), Knecht et al.
patent: 4880086 (1989-11-01), Knecht et al.
patent: 4986393 (1991-01-01), Preukschat
patent: 5324066 (1994-06-01), Masamura et al.
patent: 5431259 (1995-07-01), Mizutani et al.
patent: 5439085 (1995-08-01), Woessner

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