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. 13, 2015
Filed:
Dec. 21, 2011
Martin Bauer, Ingolstadt, DE;
Wilhelmus Gieles, Wettstetten, DE;
Martin Bauer, Ingolstadt, DE;
Wilhelmus Gieles, Wettstetten, DE;
Audi AG, Ingolstadt, DE;
Abstract
The invention relates to a device for operating a parking lock of an automatic transmission in motor vehicles, with pawl which interacts with a ratchet wheel, which pawl is impinged upon by a spring energy accumulator () and for disengaging the parking lock can be hydraulically impinged upon against the preload force of the spring energy accumulator () by a hydraulic transmission control with corresponding control valves, wherein the control valves are controllable in accordance with operating parameters of the motor vehicle and a electromagnetically operable locking element (), which in the controlled state in defined operating conditions additionally holds the pawl in the disengaged position. According to the invention, a purely hydraulically acting self locking valve () is integrated in the hydraulic transmission control (), which locking valve maintains the controlled system pressure when the parking lock operation () is pressurized or when the parking lock is disengaged.