Valve assembly of shock absorber

摘要

A valve assembly of a shock absorber can achieve both an effect of varying an attenuation force according to a frequency region of vibration or shock transferred to the shock absorber during the driving of an automobile and an effect of varying an attenuation force according to an additional pressure and can increase the attenuation force in response to an instantaneous input of a large amplitude behavior. The valve assembly includes: a valve housing coupled to a piston rod having an orifice hole and a space formed therein, the space having an open lower end to communicate with the orifice hole; a frequency sensitive valve unit including a free piston configured to vertically partition the space; and a sub-valve unit coupled to the lower end of the space, wherein operation of the sub-valve unit is controlled by ascending and descending of the free piston.

主权项

1. A valve assembly of a shock absorber, comprising:
a valve housing coupled to a lower end of a piston rod having an orifice hole formed through the piston rod, the valve housing having a space formed therein, a lower end of the space being open to communicate with the orifice hole; a frequency sensitive valve unit including a free piston configured to vertically partition the space into an upper chamber and a lower chamber and a lower stopper extending downward from a center of the free piston; and a sub-valve unit disposed in the lower end of the space and having a compression orifice and an extension orifice, wherein operation of the sub-valve unit is controlled by ascending and descending of the free piston, wherein the sub-valve unit comprises a valve body disposed in the lower end of the space and a suction valve provided at an upper portion of the valve body to open or close the compression orifice, and a side fluid channel is formed between an upper surface of the suction valve and a lower end of a side wall, and wherein the side wall is in close contact with and supported by an upper side of the suction valve to block the side fluid channel when the lower stopper is elastically deformed.