The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 17, 2002
Filed:
Oct. 26, 1999
Mannesman Sachs AG, Eitorf, DE;
Abstract
A self-pumping hydropneumatic spring strut with internal leveling for motor vehicles includes a working cylinder filled with damping medium. The working cylinder is under the pressure of at least one gas cushion arranged in a high-pressure chamber and acting as a spring. A piston divides the working cylinder into two working spaces and is connected to a hollow piston rod. Valves are arranged on the piston so that the two working spaces are in communiction through the valves. A piston pump is driven by the spring movements and pumps oil out of a low-pressure chamber into the working space connected to the high-pressure chamber and comprises a pump space formed by the hollow piston rod, a pump rod connected to the working cylinder. A further pressure generator acts upon the damping medium in the high-pressure chamber and/or the working space connected to the high-pressure space.