Patent ID: 8042791
Filing Date: 2011-10-25
Classification: F16F,Y10S

Abstract:
1. A self-pumping hydropneumatic shock absorber comprising: a working cylinder having a working space filled with hydraulic oil; a hollow pump rod fixed coaxially in the working cylinder; a high pressure chamber containing hydraulic oil and a high pressure gas cushion; a low pressure chamber containing hydraulic oil and a low pressure gas cushion; a damping piston which is movable in the working cylinder, the damping piston being attached to the end of a hollow piston rod which can slide on the pump rod, the piston drawing oil from at least one of the chambers into the working space when the piston rod travels outward, and pumping oil from the working space into at least one of the chambers when the piston rod travels inward; a discharge bore in the pump rod to compensate for pressure differences between the working spaces; a pump space between the between the high pressure chamber and the low pressure chamber, the pump space having a throttle which acts as a function of pressure difference between the chambers; and a slide element which is movable in the pump space as a function of pressure difference between the chambers, the throttle being provided in the slide element, wherein the slide element slides against an inside wall of the pump space, the slide element carrying a seal which exerts a sealing action against the inside wall.