Zf Friedrichshafen Ag

Dirk Leutheuser

Florian Weinl

Thomas Schwegler

Maik Wiesner

Armin Gierling

Matthias List

Tobias Miller

Julia Klein

Sebastian Deeg

Arthur Strehlau

In a device for locking a piston rod of a piston of an actuator, an armature rod of an electromagnet is axially movable counter to a preloading spring and includes two actuating contours. Latching mechanisms are operable to mechanically fix the piston. An axial distance between base points of the actuating contours is such that the piston is mechanically fixable by only one of the latching mechanisms in each case. Interlocking elements of both latching mechanisms are accommodated in an axially fixed manner in a sleeve, are radially displaceable, and are selectively engageable with the piston.

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

A parking lock includes a locking pawl () and an interlocking element () arranged on a connecting bar () to a selector lever (). The end of the connecting bar () facing away from the interlocking element () is articulatedly connected to the selector lever (). A hydraulically actuatable actuator () includes two pistons () provided for disengaging the parking lock. During normal operation, a detent device (), which is actuatable by an electromagnet (), locks the first piston () in a piston position corresponding to an engaged condition (P_ein) or a disengaged condition (P_aus). Without requiring activating the electromagnet () to release the detent device (), the parking lock, during normal operation, is manually disengagable with an emergency disengagement device () acting upon the second piston () and is manually engagable with an emergency engagement device () acting upon the detent device ().

Parking lock for an automatic transmission in a motor vehicle

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.

A device for locking a piston rod of a piston of an actuator is provided. An electrically actuatable electromagnet includes an armature rod, which is axially movable counter to a first preloading spring and on which two actuating elements are axially displaceably mounted between two stops of the armature rod. A second preloading spring is axially mounted between the two actuating elements. The actuating elements each include actuating contours, which are associated with latching mechanisms, via which the piston is mechanically fixable in a disengaged condition and in a engaged condition of the parking lock.

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Langenargen, Germany

Dirk Leutheuser