| 摘要 |
<p>The present invention relates to a piston valve assembly of a shock absorber which realizes damping force by responding to both pressure and frequency in order to improve riding comfort. The piston valve assembly of a shock absorber includes a main piston mounted on a piston rod moving back and forth inside a cylinder; a pressure valve disposed at a lower portion of the main piston and forming a ring-shaped first pressure chamber on a bottom surface; a lower retainer disposed at a lower portion of the pressure valve and having an upper surface opened toward an upper chamber; bypass flow channels formed from an upper side of the main piston to an upper side of the lower retainer along the vertical longitudinal direction of an outer peripheral surface of the piston rod; a guide assembly disposed between the pressure valve and the lower retainer, being in close contact with the bottom surface of the pressure valve in a high frequency area, and lowering toward the lower retainer side in a low frequency area; and a lower disk assembly disposed between the guide assembly and the lower retainer, forming a second pressure chamber at the lower retainer while covering the opened upper surface of the lower retainer, enabling the second pressure chamber and the lower chamber to be in communication in the high frequency area, and blocking the communication between the second pressure chamber and the lower chamber by the lowering of the guide assembly in the low frequency area.</p> |
