Compression cut-off valve for a hydraulic damper

Details Compression cut-off valve for a hydraulic damper Compression cut-off valve for a hydraulic damper

1993-01-11

1994-08-02

Oberleitner, Robert J.

Brakes

Internal-resistance motion retarder

Valve structure or location

188284, F16F 949

Patent

active

053337085

ABSTRACT:
A twin-tube hydraulic damper includes a fluid-filled cylinder tube closed at its lower end by a cylinder end. A piston is slidably mounted in the cylinder tube and divides an interior volume of the cylinder tube into upper and lower chambers. A plurality of intake slots permit fluid to flow from a reservoir to the lower chamber. A plurality of exit flow openings permit fluid to flow from the lower chamber to the reservoir. A cut-off cap is slidably mounted on the cylinder end and sprung away from the cylinder end by a reaction spring. An annular wall formed on the cylinder end receives the cap as the piston engages an activation spring near the travel limit of a compression stroke. Reduced fluid flow through the exit flow openings increases the damping force to reduce harsh impacts.

REFERENCES:
patent: 4185356 (1980-01-01), Kuivalainen et al.
patent: 4650043 (1987-03-01), Eckersley
patent: 4768629 (1988-09-01), Wossner
patent: 4782925 (1988-11-01), Grundei

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