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:
Aug. 28, 2018
Filed:
Dec. 16, 2015
Zf Friedrichshafen Ag, Friedrichshafen, DE;
Rainer Novak, Bregenz, AT;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A hydraulic actuating device is provided for a positive-locking shifting element of a transmission with a cylinder, in which a piston is arranged in a manner displaceable between a first end position and a second end position. The piston is a stepped piston and, with the cylinder, bounds an additional pressure chamber, which is connected to a first pressure chamber and/or a second pressure chamber through at least one hydraulic line. The volume of the additional pressure chamber decreases during an actuating movement of the piston in the direction of the first end position and increases during an actuating movement of the piston in the direction of the second end position. The degree of locking of the connection between the additional pressure chamber and the first pressure chamber and/or the second pressure chamber increases through the cylinder from a defined actuating path of the piston prior to reaching the first end position up to the first end position.