Method of stabilizing valve lift-off in hydraulic shock absorber

Details Method of stabilizing valve lift-off in hydraulic shock absorber Method of stabilizing valve lift-off in hydraulic shock absorber

1998-03-27

1999-11-30

Schwartz, Chris

Brakes

Internal-resistance motion retarder

Using diverse fluids

1882828, 1883225, F16F 906

Patent

active

059925833

ABSTRACT:
Method of stabilizing valve lift-off movement in an automotive hydraulic shock absorber having compression and expansion chambers filled with a hydraulic shock-absorber fluid is diclosed. The chamber are divided by a valve body which has one or more orifices that have fluid flow therethrough controlled by a spring biased valve that lifts off from the valve body when the fluid pressure differential between chambers is above a predetermined amount. The steps of the method comprise (a) stationing the spring biased valve with respect to the orifices so that the fluid forcing the valve to lift off and overcome the spring bias will exit from the orifices in a manner that creates a velocity gradient in the expansion chamber resulting in pressure differences that disturb a smooth lift-off of the valves; and (b) modifying the hydraulic shock absorber fluid to form a mixture containing fumed amorphous silica whereby the fluid mixture will possess a viscosity inversely proportional to the velocity of the fluid mixture regions, the mixture will achieve the needed hydraulic attenuation.

REFERENCES:
patent: 4452437 (1984-06-01), Lochner
patent: 4610332 (1986-09-01), Mourray
patent: 4726453 (1988-02-01), Obstfelder et al.
patent: 5645752 (1997-07-01), Weiss et al.
patent: 5900184 (1999-05-01), Weiss et al.

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