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. 21, 2010
Filed:
Sep. 06, 2007
Peter Schiele, Kressbronn, DE;
Armin Thiele, Tettnang, DE;
Klaus Steinhauser, Kressbronn, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A process for actuating a hydraulic storage device () of a transmission unit comprising a storage space () whose volume can be varied between a minimum and a maximum. The volume of the storage space can be changed by acting upon the storage space with pressurized hydraulic fluid from a pressure supply () of the transmission unit. To overcome a restoring tendency of the hydraulic storage device, the pressure is set to a threshold value. A holding device () holds the hydraulic storage device at least in the operating condition that corresponds to the maximum volume of the storage space against the restoring tendency. The storage space is acted upon by the pressure supply with a pressure corresponding to a threshold value (P_threshold) until the hydraulic storage device reaches the operating condition in which it can be held by the holding device.