Dual-tube shock absorber

A dual-tube shock absorber for a vehicle including a vehicle body and vehicle wheels with wheel supports, said dual-tube shock absorber includes an outer cylinder (10) and an inner cylinder (11), a piston rod (13) associated with the vehicle body;

• said outer cylinder (10) is associated with a vehicle wheel (15);
• said inner cylinder is retained in the outer cylinder;
• a damping piston is secured to the piston rod and guided axially displaceably in the inner cylinder, said damping piston separates a liquid-filled upper pressure chamber (19) from a liquid-filled lower pressure chamber (20), the upper pressure chamber (19) is penetrated by the piston rod (13);
• a partially liquid-filled compensation chamber (22) is located in a spacing between the inner and outer cylinders;
• a first check valve (26) is disposed in a bottom of the inner cylinder which enables a flow of liquid from the compensation chamber to the lower pressure chamber;
• a through conduit (34) is in the damping piston, in which conduit a second check valve (35) is placed with a flow direction toward the upper pressure chamber;
• a connecting line is between the upper pressure chamber and the compensation chamber (22), which connecting line includes a damping device (33) that is definitive for a damping action, the connecting line (31, 32;
• 36, 37) is arranged in the damping piston (18), and the damping device (33) is disposed in the damping piston (18), the dual-tube shock absorber operates during a retraction stroke by an inward spring deflection, during a compression stage and during an extension stroke by an outward spring deflection, tension stage, the damping device (33) is definitive for the damping action during the retraction stroke and during the extension stroke.