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:
Apr. 24, 2018
Filed:
Dec. 17, 2014
Zf Friedrichshafen Ag;
Helmut Baalmann, Bergrheinfeld, DE;
Hassan Asadi, Schweinfurt, DE;
Hans Gonschorrek, Bergrheinfeld, DE;
Lothar Krill, Eitorf, DE;
Alexander Kruse, Werneck, DE;
Oswald Lichtlein, Bergtheim, DE;
Dirk Litterscheid, Eitorf, DE;
Thomas Manger, Wasserlosen, DE;
Heinz Sydekum, Dittelbrunn, DE;
Harun Tucovic, Schweinfurt, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A preloading device for a piston valve of a vibration damper includes a spring element which is fitted by an inner diameter onto a radially inner centering device which serves for inner centering of the spring element in the installed state of the preloading device. To provide a preloading device for a piston valve by which a reliable inner centering of a spring element can be ensured but which can be placed with low expenditure on assembly at the same time, the spring element is axially fixed at the centering device via retaining means in that the retaining means at least partially enclose the spring element axially on both sides and are rigidly connected to the centering device in each instance.