Parking interlock in a vehicular transmission

US11022218B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Thomas Schwegler · Tettnang, DE
• Florian Weinl · Gettorf, DE
• Michael Jud · Maikammer, DE
• Armin Haugg · Friedrichshafen, DE
• Julia Klein · Oberdorf, DE

Key dates

• Filing date: Mar 1, 2019
• Grant date: Jun 1, 2021
• Expiry date: Jun 10, 2039

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H63/483
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A parking lock for a transmission of a motor vehicle having an interlocking element of a connecting rod that is biased against a parking lock disengagement direction to bring and keep a ratchet tooth of a locking pawl in engagement with a tooth space of a parking interlock gear during an engagement of the parking lock. The connecting rod is provided a spring force acting in a parking lock engagement direction from an inserting spring and a compressive force acting in the parking lock disengagement direction from a hydraulically actuatable actuator having first piston pressurizable to disengage the parking lock. A detent device actuatable by an electromagnet mechanically fixes the first piston in either a latched or unlatched piston position associated with an engaged or disengaged position of the parking lock, respectively. A system determines a current engagement position of the detent device by assessing an inductance at the electromagnet.