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. 05, 2023
Filed:
Jan. 27, 2022
Zf Friedrichshafen Ag, Friedrichshafen, DE;
Tobias Rolser, Ravensburg, DE;
Christian Popp, Kressbronn, DE;
Thilo Schmidt, Meckenbeuren, DE;
Armin Gierling, Langenargen, DE;
ZF FRIEDRICHSHAFEN AG, Friedrichshafen, DE;
Abstract
A device for operating a parking lock () of a transmission () includes an engagement spring () for engaging the parking lock (), a hydraulic actuator () for disengaging the parking lock (), an electrohydraulic control unit () for hydraulically actuating the actuator (), and an electronic control unit () for electrically actuating the actuator () and the electrohydraulic control unit (). The actuator () includes a hydraulic piston () operatively connected to the parking lock (), is actuatable by system pressure (P_sys) of the electrohydraulic control unit () via a pressure line () upon disengagement of the parking lock (), and is mechanically interlockable by an interlocking device (). A choke unit () includes an orifice () and a non-return valve () and is installed in the pressure line () downstream from the hydraulic piston ().