Patent ID: 9239092
Filing Date: 2016-01-19
CPC Classification: F16F

Claim Text:
1. A shock absorber comprising: a pressure tube defining a fluid chamber; a piston assembly disposed within said pressure tube, said piston assembly dividing said fluid chamber into an upper working chamber and a lower working chamber; a piston rod projecting out of said pressure tube, said piston assembly being attached to said piston rod and said piston rod including an axial passageway that forms an internal bore extending through a portion of a length of said piston rod and acting as a portion of a fluid bypass flow path; a frequency dependent valve assembly attached to said piston rod, said frequency dependent valve assembly comprising: movement of said spool valve within said fluid cavity in response to movement of said piston rod changes an amount of fluid pressure required to open said bypass valve assembly; and wherein said bypass valve assembly includes an interface and a valve disc, said frequency dependent valve assembly further comprising a spring biasing said valve disc into engagement with said interface, a bypass chamber being defined by said interface and said valve disc.