Damping force control type hydraulic shock absorber

Details Damping force control type hydraulic shock absorber Damping force control type hydraulic shock absorber

1993-05-27

1995-04-25

Oberleitner, Robert J.

Brakes

Internal-resistance motion retarder

Having a thrust member with a variable volume chamber

18832215, F16F 9346

Patent

active

054090903

ABSTRACT:
A damping force control type hydraulic shock absorber includes a cylinder having a hydraulic fluid sealed therein. A piston is slidably fitted in the cylinder to divide the inside of the cylinder into two chambers. A main hydraulic fluid passage provides communication between the two chambers and has a damping force generating mechanism. A bypass passage also provides communication between the two chambers. A cylindrical guide member is provided in the bypass passage to provide communication between two portions of the bypass passage which lead to the two chambers, respectively, through ports provided in the side wall of the guide member. A cylindrical shutter is rotatably fitted in the guide member. The shutter has openings capable of aligning with the ports. The ports and the openings cooperate to provide a damping force which changes generally linearly as the shutter rotates.

REFERENCES:
patent: 3827538 (1974-08-01), Morgan
patent: 4645043 (1987-02-01), Imaizumi
patent: 4765446 (1988-08-01), Murata et al.
patent: 4800994 (1989-01-01), Imaizumi et al.
patent: 4800995 (1989-01-01), Bernhardt et al.
patent: 4997068 (1991-03-01), Ashiba
patent: 5129488 (1992-07-01), Furuya et al.
patent: 5242038 (1993-09-01), Yamaoka
patent: 5293971 (1994-03-01), Kanari et al.

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