Wabco Gmbh

Zf Cv Systems Europe Bv

Romain Poux

Dirk Müntefering

Stefan Groetzinger

Dennis Reimann

Michael John

Timo Gerlach

In a device for sensing the position of a shift fork in a transmission, the shift fork is connected to a piston rod of a shifting piston which is guided axially in a shifting cylinder. The shift fork engages an axially slidable sliding sleeve, which slides on a transmission shaft, to engage or disengage a transmission stage. A magnet functioning as a signal generator is arranged on an actuating element, such as the switching piston, piston rod or shift fork. A 3D Hall sensor positionally fixed relative to the magnet functions as a signal receiver, sensing a magnetic field generated by the magnet. An electronic control unit connected to the 3D hall sensor determines the position of the shift fork from the relative positions of the magnet and 3D Hall sensor and transmits the position as a signal, taking into account linear, rotational, and/or pivoting movements of the actuating element.

Device and method for sensing the position of a shift fork of a transmission

An actuator () for an automated or automatic transmission has a cylinder housing (), a piston unit (), and a piston rod (). The piston unit () is coupled to the piston rod () and is arranged movably in the cylinder housing () along a longitudinal axis (). The piston unit () separates two pressure chambers () of variable volume in the cylinder housing (). The pressure chambers are configured to load the piston unit () with compressed air on both sides. The two pressure chambers () are connected to a valve unit () for switching between pressurization and purging of each of the two pressure chambers (). An end stop clamping device for damping at least one end stop of the piston unit () is arranged in the actuator (). A pneumatically and a mechanically operating damping stage are provided improve the end stop damping device.

Actuator for an automated or automatic transmission, and method for controlling the actuator

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Hannover, Germany

Romain Poux