Spring devices – Vehicle – Comprising compressible fluid
Patent
1990-08-16
1993-01-26
Butler, Douglas C.
Spring devices
Vehicle
Comprising compressible fluid
267221, 280276, 280710, 280714, B60G 1512, B62K 2504, F16F 906, F16F 950
Patent
active
051816962
ABSTRACT:
A vehicle height adjusting device for attachment to a vehicle hydraulic shock absorber having a pump chamber used for delivering the fluid under pressure by the compression and extension strokes of the shock absorber. The device includes a hydraulic jack unit arranged in series with a suspension spring and a change-over valve for selectively adjusting vehicle height to a up position or a down position. The pump chamber, jack unit and reservoir are connected through the change-over valve by the delivery line for delivering hydraulic fluid from the pump chamber to the jack unit in the up position set by the change-over valve, a line for returning hydraulic fluid from the jack unit to the reservoir in the down position of vehicle height, and a line for by-passing hydraulic fluid from the pump chamber. The device has a supply line which branches from the delivery line upstream to the change-over valve and communicates with the reservoir, a first check valve arranged in the supply line in the direction of preventing the flow of fluid from the pump chamber to the reservoir, a second check valve provided in the delivery line downstream to a branch point of the supply line in the direction of preventing the flow of fluid from the jack unit to the pump chamber, a relief line provided between the second check valve and the branch point of the supply line and communicating with the reservoir, and a relief valve provided in the relief line.
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Butler Douglas C.
Kabushiki Kaisha Showa Seisakusho
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