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:
Nov. 19, 2019
Filed:
Aug. 03, 2017
Zf Friedrichshafen Ag, Friedrichshafen, DE;
ZF FRIEDRICHSHAFEN AG, Friedrichshafen, DE;
Abstract
A multi-speed transmission with hydraulically actuated shift rods, wherein an actuating pressure (p_B) is applicable by a valve device () and shuttle valves (C toD) to piston chambers (A toB) of pistons (to), the actuating pressure being adjustable by valves (). The piston chambers (A toB) can be brought into operative connection with a low-pressure region () by the shuttle valves (C toD) and a prefilling valve () or by the shuttle valves (C toD), the valve device (), and the valves (). Each of the shuttle valves (C toD) has a spring assembly (E toF), by which the shuttle valves (C toD) are held below a pressure threshold of the actuating pressure (p_B) in an operating state that connects the piston chambers (A toB) to the low-pressure region () by the prefilling valve ().