The invention relates to a hydraulic shock absorber comprising a shock absorber tube (1) into which a hollow piston rod (2) is immersed in an oscillating manner corresponding to successive compression stages (D) and rebound stages (Z), said piston rod being connected to a working piston (4) that divides the interior of the shock absorber tube (2) into two working areas (1a and 1b). In the process, a bypass which connects the two working areas (1a and 1b) of the shock absorber tube (1) runs through the working piston (4), wherein a piston slide valve (7) which is used to block and release the bypass and is actuated by the pressure of a control pressure medium is arranged in the path of the bypass, said piston slide valve containing a piston slide (7b) which can be displaced by the control pressure medium (S) against the force of a restoring spring (8) and which blocks or releases the bypass. The aim of the invention is to allow such a shock absorber to be switched to a lower damping effect of the rebound stage by means of a controlled pressure application and without changing the damping effect of the compression stage. For this purpose, the piston slide (7b) of the piston slide valve (7) has blocking positions for a faulty operation and for a heavy load operation, said blocking positions blocking the bypass at the beginning and at the end of the displacement path of the slide, and the piston slide is provided with at least one release position in the longitudinal region of the displacement path, said release position releasing the bypass. The bypass is additionally paired with a non-return valve (12) which prevents damping fluid from passing through the bypass during the compression stage (D) of the shock absorber and allows damping fluid to pass through the bypass during the rebound stage (Z) of the shock absorber.
HYDRAULIC SHOCK ABSORBER
2023-07-06
Patent
Electronic Resource
English