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:
Mar. 04, 2014
Filed:
Jun. 01, 2010
Hans-joachim Martin, Kressbronn, DE;
Anton Fritzer, Markdorf, DE;
Hans-Joachim Martin, Kressbronn, DE;
Anton Fritzer, Markdorf, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A pressure medium supply device of a hydraulically actuated shifting element (K, K) comprises at least one pressure medium supply duct () in communication with a pump () and a line () for pre-filling of the shifting element. An additional pressure-retaining valve () or a check diaphragm is integrated in the pressure medium supply duct (), between the shifting element and the shifting element valve (), and can be closed in the draining direction of the pressure medium supply duct (). The pressure-retaining valve () is designed such that the shifting element can be drained and the pressure medium supply device can be vented.