Device for locking a piston rod of a piston of an actuator which is pressurizable in order to disengage a parking lock and is spring-loaded in order to engage the parking lock

US11261967B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Maik Wiesner · Weingarten, DE
• Florian Weinl · Gettorf, DE
• Dirk Leutheuser · Oberdorf, DE
• Thomas Schwegler · Tettnang, DE

Key dates

• Filing date: Dec 4, 2020
• Grant date: Mar 1, 2022
• Expiry date: Dec 4, 2040

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H63/3425
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A device for locking a piston rod of a piston includes a latching mechanism actuatable by an actuating element. The actuating element is fixedly arranged on an armature rod of an electromagnet, is clamped between two preloading springs, and includes two actuating contours. Components of the device are configured with respect to geometry and with respect to forces acting upon each of the components such that a permanent magnet holds the armature rod in a first position in the non-energized condition of an electromagnet and in the engaged condition of the parking lock and such that the electromagnet holds the armature rod in a second position in the energized condition and in the disengaged condition of the parking lock. The parking lock is disengageable in the pressurized condition of the piston and in the energized condition of the electromagnet, and the parking lock is engageable in the non-pressurized condition of the piston and in the non-energized condition of the electromagnet.