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. 29, 2005
Filed:
Jun. 25, 2002
Eberhard Biermann, Ravensburg, DE;
Georg Gierer, Kressbronn, DE;
Eberhard Biermann, Ravensburg, DE;
Georg Gierer, Kressbronn, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A shift element sub-assembly for a transmission having two axially adjacent shift elements () that are located in a transmission housing (). The discs of both shift elements () lie axially adjacent in the interior of the disc carrier () and are separated from one another by a central partition () of the disc carrier (). Each shift element () has a piston () and a closing pressure chamber (), and at least one resetting element () for resetting the piston. Additionally, each shift element () has a secondary piston (), which acts on the discs of each shift element () in opposition to a resetting force of the resetting element () of each shift element (), via the piston () of each shift element (), and at least one resetting element () of the shift element sub-assembly is configured as a drain pressure chamber () that can be hydraulically or pneumatically actuated.