Zf Friedrichshafen Ag

Thomas Schwegler

Florian Weinl

Maik Wiesner

Dirk Leutheuser

Michael Pantke

Martin Ruider

Julia Klein

Armin Haugg

Michael Jud

Sven Jabs

Thomas Speh

Andreas Bisping

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 device () for actuating a parking lock device () of an automatic transmission includes a piston () guided in a cylinder () and hydraulically displaceable counter to a spring force of an actuation spring (). The piston () is form-lockingly fixable in a first position and in a second position by radially displaceable blocking elements () of a blocking device (). The blocking elements () are radially displaceable by an actuation element (). The radial displacement path of the blocking elements () and an operating condition of the actuation element () corresponding thereto in the first position of the piston () deviate from the radial displacement path of the blocking elements () and the operating condition of the actuation element () corresponding thereto in the second position of the piston ().

Device for actuating a parking lock means of an automatic transmission and method for operating such a device

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.

An electromagnetic control mechanism for a switching element is described herein, which can be switched to an open operating state and to a closed operating state by means of an electromagnet and an actuating unit that acts counter to the actuation force of the electromagnet. The electromagnet has a dedicated mechanism for dampening the actuation movement of an anchor of the electromagnet toward a section of the coil, by means of which the actuation speed of the anchor can be reduced after a distance between a section of the anchor facing the coil and the section of the coil becomes shorter than a predefined distance. The mechanism for dampening comprises at least one component connected to the coil, which becomes functionally connected to the anchor after the distance becomes shorter than the defined distance, wherein, as the displacement of the anchor increases, liquid can be discharged from a chamber bordered by the component and the anchor via a throttle mechanism to an extent that reduces the actuation speed of the anchor.

Electromagnetic actuating device for a switching element

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.

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Tettnang, Germany

Thomas Schwegler