Valve structure of shock absorber

摘要

A valve structure includes a piston valve assembly, and a frequency unit including a hollow housing, a free piston and an auxiliary valve assembly. The piston valve assembly, installed at one end of a piston rod, operates with the inside of a cylinder being divided into upper and lower chambers, and generates a damping force varying according to a moving speed. The frequency unit moves together with the piston valve assembly and generates a damping force varying according to a frequency. The housing is mounted at a lower end of the piston rod such that the housing is disposed under the piston valve assembly. An inner space of the housing is partitioned into upper and lower spaces by the free piston. The free piston is disposed to be vertically movable within the housing. The auxiliary valve assembly is mounted at a lower end of the housing.

主权项

1. A valve structure of a shock absorber including a cylinder filled with a working fluid and a piston rod having one end located inside the cylinder and the other end extending outward from the cylinder, the valve structure comprising:
a main piston valve assembly installed at one end of the piston rod and configured to operate in a state that the inside of the cylinder is divided into an upper chamber and a lower chamber, and generate a damping force varying according to a moving speed; and a frequency unit configured to move together with the main piston valve assembly and generate a damping force varying according to a frequency, wherein the frequency unit comprises: a hollow housing mounted at a lower end of the piston rod such that the housing is disposed under the main piston valve assembly; a free piston disposed to be vertically movable within the housing; and an auxiliary valve assembly mounted at a lower end of the housing, and an inner space of the housing is partitioned into an upper space and a lower space by the free piston, wherein a stepped portion limiting the movement of the free piston is formed on an inner surface of the upper space of the housing, and wherein the free piston has a through-hole that is opened by a valve body after the free piston contacts the stepped portion.