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:
Jan. 03, 2012
Filed:
Mar. 02, 2006
Holger Kirchner, Ruppichteroth, DE;
Norbert Ackermann, Eitorf, DE;
Holger Kirchner, Ruppichteroth, DE;
Norbert Ackermann, Eitorf, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A piston-cylinder unit for installing between a vehicle body and an axle includes a cylinder filled with damping medium, a piston dividing the cylinder into working spaces, and a piston rod. A first damping valve assembly in the piston damps movement of the piston in tension and in compression. A load dependent valve includes a valve body which can be moved axially by pressure in the damping medium, the valve body having axially opposed first and second actuation surfaces. The first actuation surface is exposed to pressure of a first accumulator, which is connected to one of the working spaces, and the second actuation surface is exposed to pressure of a second accumulator.