Shock absorber

Details Shock absorber Shock absorber

1978-11-29

1980-05-20

Reger, Duane A.

Brakes

Internal-resistance motion retarder

Having a thrust member with a variable volume chamber

188282, F16F 9348

Patent

active

042035074

ABSTRACT:
A hydraulic shock absorber of the type having a cylinder and a piston with axial passages therethrough. The piston is mounted to slide within the cylinder. Valve plates having orifices therethrough are provided to control flow through the axial passages of the piston. Certain of the valve plates are situated to operate together with a variable effective orifice on the downstream side of the axial passages and to act with a fixed effective orifice as check valve plates when the flow is reversed. The composite valve thus defined offers a smooth and properly sloping velocity-resistance curve. The shock absorber also includes a foot valve assembly controlling flow between the interior of the cylinder and an annular oil reservoir outside the cylinder. The foot valve assembly may have two check valves for controlling flow through two sets of foot valve passages or it may employ a check valve spring which changes from a "V" shape to a flat shape to cover orifices in a check valve plate.

REFERENCES:
patent: 2732039 (1956-01-01), Funkhouser et al.
patent: 3134460 (1964-05-01), De Carbon
patent: 3470986 (1969-10-01), Whisler
patent: 3756357 (1973-09-01), Graff et al.

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