Spring devices – Vehicle – Comprising compressible fluid
Patent
1988-09-21
1989-10-31
Reger, Duane A.
Spring devices
Vehicle
Comprising compressible fluid
267 6418, 267 6419, F16F 9342
Patent
active
048772232
ABSTRACT:
A hydraulic shock absorber unit provides automatic maintenance of a predetermined spacing between a sprung load and an unsprung portion where the mass of the sprung load is subject to change. The shock absorber unit includes a liquid filled cylinder in a cylinder body with a piston disposed in the cylinder for dividing the cylinder into a variable volume compression chamber and a variable volume rebound chamber. The piston is axially reciprocable within the cylinder and operates as a pump for a self-leveling fluid circuit. The shock absorber is connected between the sprung load and the unsprung load such that piston has a fixed spacing relative to a point on one of the loads, typically the sprung load. The cylinder has a fixed spacing relative to a point on the unsprung load. A lift chamber is axially disposed between the cylinder body and the sprung load for returning the shock absorber to a predetermined extension during transient loading conditions. A fluid circuit delivers fluid to the lift chamber during compression strokes of the piston for varying pressure in the lift chamber as a function of the mass of the sprung load. A bleed valve drains fluid from the lift bladder when the shock absorber extension exceeds the predetermined spacing. A fluid circuit recirculates fluid from the lift chamber to the compression and rebound chambers as required for normal damping of transient oscillations of the sprung load.
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Hackett Jeffrey K.
Reger Duane A.
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