Patent ID: 8708431

Claim:
Arrangement for controlling a track tension wheel of a tracked vehicle, comprising: a guide arm system, which at an inner part thereof is designed to be swivel-mounted in a part fixed to the vehicle and which on an outer part carries a wheel axle journal for rotatably supporting a hub of the track tension wheel, in such a way that this can be swivelled by means of a first drive element between a raised position and a lowered position, and a second drive element for varying the centre-to-centre distance between the centre axis of the track tension wheel and the swivel axis of the guide arm system in the part fixed to the vehicle, in order to bring about an adjustment of the tension in a drive track of the vehicle bearing against the tension wheel, or to allow changing of the drive track, wherein the guide arm system comprises a first guide arm, which at an inner end thereof is designed to be swivel-mounted in the part fixed to the vehicle and which at an outer end, via a joint pin ( 18 ), pivotally supports a two-armed lever between a first end and a second end of the lever, a second guide arm, which at an inner end thereof is designed to be swivel-mounted in the part fixed to the vehicle and which at an outer end is pivotally connected to an outer end of a linearly displaceable part of the first drive element, and a third guide arm, which at its one end is pivotally connected to the outer end of the second guide arm and which at its other end is pivotally connected to the first end of the two-armed lever, the other end of the lever carrying the wheel axle journal, in addition to which an outer end of a linearly displaceable part of the second drive element is effectively connected to the two-armed lever carrying the wheel axle journal.