Patent ID: 9261160
Filing Date: 2016-02-16
CPC Classification: F16F

Claim Text:
1. A piston valve of a shock absorber, comprising: a main valve unit coupled to a lower end of a piston rod which has an orifice hole, to divide an inside of a cylinder into an extension chamber and a compression chamber, the main valve unit generating an attenuation force according to a difference of pressure between the extension chamber and the compression chamber; and a frequency sensitive valve unit installed at one side of the main valve unit and configured to generate an attenuation force according to a frequency of hydraulic fluid delivered through the orifice hole of the piston rod; and a valve housing having a space which communicates with the orifice hole and coupled to the lower end of the piston rod, so that the main valve unit is coupled to an outer circumferential surface of the valve housing and the frequency sensitive valve unit is installed in the space of the valve housing, wherein the valve housing has a variable inner diameter so that an inner diameter at which the valve housing and the lower end of the piston rod are coupled is smaller than an inner diameter at which the frequency sensitive valve unit is installed in the space, and the frequency sensitive valve unit is installed within the main valve unit.