METHOD OF STABILIZING VALVE LIFT-OFF IN HYDRAULIC SHOCK ABSORBERS

摘要

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 and divided by a valve body with one or more orifices that have fluid flow therethrought 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.