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:
Jan. 22, 2019
Filed:
Mar. 25, 2015
Zf Friedrichshafen Ag, Friedrichshafen, DE;
Rainer Novak, Bregenz, AT;
Tobias Pfleger, Markdorf, DE;
ZF FRIEDRICHSHAFEN AG, Friedrichshafen, DE;
Abstract
A transmission includes a hydraulic system connected to a hydraulic pump and to an additional hydraulic pump. A secondary pressure circuit is connectable to a primary pressure circuit with a system pressure valve. A pressure side of the hydraulic pump is coupled directly with the primary pressure circuit and connectable to the secondary pressure circuit with the system pressure valve. A pressure side of the additional hydraulic pump is coupled directly with the secondary pressure circuit. The pressure side of the hydraulic pump proximate the secondary pressure circuit is connectable to a gear set, to a dual-clutch system and to a suction area of the hydraulic pump and the additional hydraulic pump by a valve device. The pressure side of the additional hydraulic pump is in connection with the gear set and is connectable with the dual-clutch system by the valve device.