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:
Nov. 13, 2012
Filed:
Oct. 12, 2006
Andreas Föster, Schweinfurt, DE;
Alfred Wirth, Schweinfurt, DE;
Heinz-joachim Gilsdorf, Donnersdorf, DE;
Thomas Kutsche, Schweinfurt, DE;
Andreas Föster, Schweinfurt, DE;
Alfred Wirth, Schweinfurt, DE;
Heinz-Joachim Gilsdorf, Donnersdorf, DE;
Thomas Kutsche, Schweinfurt, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
The vibration damper with an adjustable damping force includes a cylinder filled with a damping medium, a piston rod axially movable in the cylinder and carrying a piston which divides the cylinder into a first working space on the piston rod side and a second working space on the side away from the piston rod, a first adjustable damping valve which is connected to at least one of the two working spaces by means of a fluid connection, at least one second valve which is connected hydraulically in parallel to the first adjustable damping valve, and a third damping valve arranged in series to and upstream from both the first and second valves, the third damping valve moving in a closing direction as a function of a flow velocity of the damping medium through the third damping valve.