US Patent 9821623 Adjustable shock absorber

An adjustable shock absorber includes a base unit, a primary cylinder, a shock rod, a main piston, a biasing member, a hydraulic adjusting unit, a secondary cylinder, a floating piston, a valve module, and a micro-adjusting unit. When an impact force is exerted on the shock rod against a biasing force of the biasing member to force a working liquid to flow from a primary chamber into a liquid sub-chamber of the secondary cylinder, a working gas in a gas sub-chamber of the secondary cylinder is compressed to generate a damping force to act on the working liquid so as to permit the working liquid to flow back to the primary chamber. The damping force can be adjusted by adjusting a needle valve of the micro-adjusting unit.