PISTON VALVE ASSEMBLY FOR SHOCK ABSORBER

摘要

In a piston valve assembly for a shock absorber, a main piston partitions a cylinder into an upper chamber and a lower chamber. Compression passages and rebound passages penetrate the main piston in a vertical direction. A first compression value forms a first compression chamber, and a top surface of a lower retainer is opened toward the upper chamber. Bypass passages are formed on an outer peripheral surface of the piston rod. A guide assembly surrounds an outer peripheral surface of the compression valve and the bottom surface of the compression valve, tightly contacts the bottom surface of the compression valve in a high-frequency section, and moves down toward the lower retainer in a low-frequency section. A lower disk assembly forms a second compression chamber in the lower retainer while covering the opened top surface of the lower retainer, communicates the second compression chamber with the lower chamber in the high-frequency section, and blocks the communication between the second compression chamber and the lower chamber in the low-frequency section due to the downward movement of the guide assembly.

主权项

1. A piston valve assembly for a shock absorber, comprising:
a piston rod reciprocating within a cylinder; a main piston mounted on the piston rod and partitioning the cylinder into an upper chamber and a lower chamber, wherein a plurality of compression passages and a plurality of rebound passages penetrate the main piston in a vertical direction; a compression valve mounted on the piston rod and disposed under the main piston, wherein the first compression value forms a first compression chamber on a bottom surface, the first compression chamber having a ring shape around the piston rod toward the lower chamber; a lower retainer mounted on the piston rod and disposed under the compression valve, wherein a top surface of the lower retainer is opened toward the upper chamber; a plurality of bypass passages formed on an outer peripheral surface of the piston rod from an upper side of the main piston to an upper side of the lower retainer along a vertical length direction; a guide assembly mounted on the piston rod and disposed between the compression valve and the lower retainer, wherein the guide assembly surrounds an outer peripheral surface of the compression valve and the bottom surface of the compression valve, tightly contacts the bottom surface of the compression valve in a high-frequency section, and moves down toward the lower retainer in a low-frequency section; and a lower disk assembly mounted on the piston rod and disposed between the guide assembly and the lower retainer, wherein the lower disk assembly forms a second compression chamber in the lower retainer while covering the opened top surface of the lower retainer, communicates the second compression chamber with the lower chamber in the high-frequency section, and blocks the communication between the second compression chamber and the lower chamber in the low-frequency section due to the downward movement of the guide assembly.