Patent ID: 8324887

Claim:
A device for determining a rotational speed of a transmission shaft ( 12 ), the device comprises: a speed indicator ( 3 ) being continuously connected to a sliding sleeve which is connected, in a rotationally fixed manner, to the transmission shaft ( 12 ), and the sliding sleeve being axially slidable on the transmission shaft, at least one rotational speed sensor ( 2 ) with at least one rotational speed sensor element ( 10 ), the sensor element ( 10 ) detecting the rotational speed of the transmission shaft ( 12 ) via the speed indicator ( 3 ), the speed sensor ( 2 ) being fixed to a shifting element ( 5 ), and the shifting element axially biasing the sliding sleeve along the transmission shaft the rotational speed indicator ( 3 ) being continuously connected on a circumference of the sliding sleeve ( 4 ) of a clutch device ( 1 ) which is movable, relative to an axial direction of the transmission shaft ( 12 ), to a neutral position, a first clutch position and a second clutch position, the sliding sleeve ( 4 ) comprising an annular groove ( 11 ) in which the shifting element ( 5 ) engages for axially biasing the sliding sleeve ( 4 ), and the external teeth ( 3 ) of the sliding sleeve 4 having two lateral tooth sections ( 3 a , 3 b ) with the annular groove ( 11 ) extending therebetween.