Patent ID: 9638280
Date: 2017-05-02
CPC Classifications: F16F

Claim:
1. A shock absorber comprising: a pressure tube defining a fluid chamber for containing a working fluid; a reserve tube, with the pressure tube being disposed within the reserve tube to define a working fluid reservoir between the pressure tube and the reserve tube; a piston assembly disposed within the pressure tube and secured to a piston rod, the piston assembly disposed dividing said fluid chamber into an upper working chamber and a lower working chamber; a base valve assembly disposed between the lower working chamber and the working fluid reservoir, the base valve assembly including a frequency dependent valve system operable to: the frequency dependent valve system further including: a valve seat plate in contact with a distal end of a spool valve; an interface member in contact with the valve seat plate; a biasing element for biasing the interface member into contact with the valve seat plate and the distal end of the spool valve; a valve body disposed between the spool valve and the valve seat plate, the valve body having a bypass flow path in communication with the working fluid reservoir; and wherein a pressure of the working fluid acting on the spool valve during a compression stroke, and during a high frequency movement of the shock absorber, operates to force the interface member away from the valve seat plate permitting a flow of the working fluid therebetween.