Device for manoeuvring a tension wheel of a tracked vehicle

Device for manoeuvring a tension wheel in a chassis of a tracked vehicle, in which the tension wheel is rotatably mounted on a free end of a telescopic rocker arm mounted pivotably about a transverse axis in the vehicle, the rocker arm being able to be lengthened and shortened by means of a first drive mechanism and being able to be swivelled about the transverse axis by means of a second drive mechanism for the purpose of raising and lowering the tension wheel, wherein the first drive mechanism is designed to be able to rotate a sleeve rotatable about the transverse axis in a hub part of an inner part of the rocker arm, which sleeve has an eccentrically mounted crank pin which is hinge-connected to an outer part of the rocker arm for the purpose of displacing the latter relative to the inner arm part in the event of a mutual rotation motion between the sleeve and the hub part of the inner rocker arm part in such a way that the rocker arm is lengthened upon a downward swivel motion of the arm and the tension wheel by courtesy of the second drive mechanism.