Brakes – Internal-resistance motion retarder – Having a thrust member with a variable volume chamber
Patent
1992-08-14
1993-09-21
Oberleitner, Robert J.
Brakes
Internal-resistance motion retarder
Having a thrust member with a variable volume chamber
188318, 18832217, F16F 900
Patent
active
052460924
ABSTRACT:
A hydraulic shock absorber for a vehicle includes a cylinder tube through which a piston is slidably displaced to define upper and lower chambers, a reservoir tube surrounding the cylinder tube to define a reservoir chamber, a piston rod guide member mounted in a first end portion of the cylinder tube which guides a stroke of a piston rod to which the piston is attached, a valve assembly, provided in a second end portion of said cylinder tube, for restricting fluid flow among the upper chamber, the lower chamber, and the reservoir chamber to create damping force during bounding and rebounding strokes of the piston, a seal provided in an end portion of the reservoir tube for sealing between the piston rod and the reservoir tube, and a fluid passage communicating between the valve assembly and the reservoir chamber. The fluid passage directing leak fluid from the seal of the piston rod guide member to the reservoir chamber. Thus, since the fluid in the lower chamber is allowed to leak through the piston rod guide member during a rebounding stroke of the piston rod, liquid-tight engagement is not required between the piston rod guide member and the piston rod, thus low friction is provided to allow the piston rod to be displaced smoothly.
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Atsugi Unisia Corporation
Kananen Ronald P.
Oberleitner Robert J.
Young Lee W.
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