DAMPING MECHANISM FOR SHOCK ABSORBER AND COMBINED HYDRAULIC-PNEUMATIC DAMPING-BASED SHOCK ABSORBER EMPLOYING SAME

摘要

A damping mechanism for a shock absorber and a combined hydraulic-pneumatic damping-based shock absorber employing the same. At the instant of a downward pressing movement, part of a damping medium flows from a small hole (3-1-2) to a large hole (3-1-3), thereby damping the downward movement; part of the damping medium flows in a gap between a damping piston (3) and a rod tube (1); and part of the damping medium flows from an outer side wall recess (3-1-4) of a piston ring (3-1) through a sawtooth notch (3-2-1) into the large hole (3-1-3), thereby effectively solving the issue of feeling an impact at the moment of the downward movement of the shock absorber. During elastic return, a piston seal ring (3-2) expands outwards to block the gap between the damping piston (3) and the rod tube (1), thereby improving a damping effect during elastic return. Especially in situations in which a continuous bumpy road is present, the shock absorber has a long travel path, and the frequency of reciprocating motion must be high, the damping effect is more pronounced. In the combined hydraulic-pneumatic damping-based shock absorber, a sealed pneumatic chamber is formed between the rod tube (1) and a bushing (8) by means of guided sealing, thereby preventing the shock absorber from moving downwards and contacting a base portion, and realizing a combined hydraulic-pneumatic shock absorbing effect.