Damping force control type hydraulic shock absorber

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

1993-11-18

1995-07-11

Oberleitner, Robert J.

Brakes

Internal-resistance motion retarder

Controlled by an operator remote from retarder

188318, 18832213, F16F 934

Patent

active

054312590

ABSTRACT:
A damping force control type hydraulic shock absorber has a piston that has main hydraulic fluid passages and valve mechanisms and also has a piston rod connected thereto. One side of the cylinder of the shock absorber is provided with a damping force control mechanism having a guide member and a shutter, which open and close a bypass passage, and a valve mechanism that generates damping force by controlling the flow of hydraulic fluid through the bypass passage. Damping force characteristics are changed by rotating the shutter with a rotary actuator. Since the damping force control mechanism is provided on the side of the cylinder and the piston is provided with only the main hydraulic fluid passages and the valve mechanisms, the size of the piston assembly is relatively small. Accordingly, the stroke of the piston rod can be increased.

REFERENCES:
patent: 2048037 (1936-07-01), Smith
patent: 2237915 (1941-04-01), Routson
patent: 3213973 (1965-10-01), Damon
patent: 3795291 (1974-03-01), Naito et al.
patent: 4673068 (1987-06-01), De Bruijn
patent: 4732244 (1988-03-01), Verkuylen
patent: 4880086 (1989-11-01), Knecht et al.
patent: 5180039 (1993-01-01), Axthammer et al.

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