Patent ID: 9212719
Filing Date: 2015-12-15
Classification: F16F

Abstract:
1. A shock absorber comprising: a piston rod reciprocating within a cylinder and having a groove formed in an outer periphery thereof; a first piston connected to an end of the piston rod and forming an internal space recessed downward, the first piston including a first pressure chamber through which a working fluid flows during a rebound stroke, and a third pressure chamber which is connected to a compression passage passing therethrough in a vertical direction; a pilot valve connected to the end of the piston rod and disposed in the internal space to selectively open or close a lower end of the first pressure chamber; a second piston which is connected to the end of the piston rod and of which an upper portion is received in the internal space such that the second piston is disposed below the first piston, the second piston including a second pressure chamber connected to the first pressure chamber, and a slit for communicating the second pressure chamber with the groove; a guide member connected along an edge of the pilot valve to cover an upper outer periphery of the second piston and move upward and downward while interlocking with the pilot valve; a rebound retainer connected to the end of the piston rod and disposed below the second piston, the rebound retainer including a fourth pressure chamber connected to the second pressure chamber; and a disk valve assembly connected to the end of the piston rod and disposed below the rebound retainer to open or close a passage of the fourth pressure chamber.