Patent ID: 7213689

Claim:
A shock absorber for a remote-controlled model car comprising a hydraulic cylinder and a spring member, said hydraulic cylinder having a cylinder and a piston rod, said cylinder having its interior filled with hydraulic oil, said piston rod having one end of its rod body connected with a piston with flow-guiding holes, said piston clogged in the interior of said cylinder, said spring member fitted between said cylinder and said piston rod, said spring member enabling said piston rod to recover their original position: and, Characterized by a sealing member fixed on a preset portion of the topside of said piston of said piston rod, said sealing member formed with at least one flexible portion positioned over said flow-guiding hole of said piston, said flexible portion of said sealing member slightly turning upward, a flow gap formed between said flexible portion of said sealing member and the upper outer side of said piston, said flexible portion bored with a flow-adjusting hole aligned to said flow-guiding hole of said piston, said flow-adjusting hole smaller in size than said flow-guiding hole, said flexible portion of said sealing member distorted and shifted toward the topside of said piston to diminish or close up said flow gaps when said flexible members are properly compressed by the hydraulic pressure, the flow amount of liquid oil flowing through said flow-guiding holes of said piston can be controlled by adjusting the positions of said sealing member, said shock absorber able to automatically adjust its buffering force to an excellent condition according to different extents of external forces.