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:
Sep. 27, 2005
Filed:
Apr. 27, 2002
Helmut Eymüller, Friedrichshafen, DE;
Siegfried Stützle, Friedrichshafen, DE;
Jürgen Legner, Friedrichshafen, DE;
Helmut Eymüller, Friedrichshafen, DE;
Siegfried Stützle, Friedrichshafen, DE;
Jürgen Legner, Friedrichshafen, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A shiftable transmission in which at least two clutches () actuated in closing direction by spring force and in opening direction by the exertion of pressure are arranged, wherein output of the transmission is stopped by unpressurized shifting of both actuation devices () thereby closing both clutches (). When pressure is exerted upon the second actuation device (), the actuation force of the first actuation device () is composed of a spring force of the first actuation device () and a hydraulic force from the pressurization of the second actuation device (). The clutch belonging to the first actuation device can thus be impinged upon with different forces depending on whether or not the second actuation device is impinged upon with pressure.