Patent ID: 8695766
Filing Date: 2014-04-15
Classification: F16F

Abstract:
1. A shock absorber comprising: a cylinder in which a working fluid is hermetically contained; a piston slidably inserted into the cylinder and configured to partition the inside of the cylinder into first and second chambers; a piston rod connected to the piston and extending to the outside of the cylinder via the first chamber; an elastic member installed in the cylinder and configured to elastically act on the piston rod to suppress full extension of the piston rod; a first passage configured to communicate the first and second chambers to flow the working fluid therebetween by movement of the piston; and a second passage in communication with the first chamber, wherein the first passage comprises a damping valve configured to suppress a flow of the working fluid generated by movement of the piston to generate a damping force, the second passage comprises a variable orifice having an area adjusted by the elastic member when the piston rod moves in an extension direction, a housing installed in series with the variable orifice, and a free piston slidably provided in the housing, and a first side of the housing closer to a first side of the free piston is connected to the second passage to form a pressure chamber, and a second side of the housing closer to a second opposite side of the free piston communicates with the second chamber.