A track system comprising a dynamic tensioning device located between an idler wheel and the support frame as to apply proper tension in the track. The dynamic tensioning device is adapted to block at its current length upon the occurrence of a determined condition. The dynamic tensioner is adapted to substantially maintain its length when an acceleration and or deceleration of the track system reaches a predetermined value. For instance, such characteristic is relevant in an event of emergency braking. A dynamic tensioner would become contracted and the tension in the endless track would become too low. A low tension could cause the endless track to ratchet.

An agricultural vehicle having a full-track design with a vehicle structure on each side of which, relative to a vehicle longitudinal axis, a track roller unit is arranged. The track roller unit has roller unit body to which a front deflector roll, a rear deflector roller and a plurality of yoke-type track rollers arranged therebetween are coupled, and an endlessly closed track belt that wraps around the rollers/roller. All the rollers are suspended with respect to the roller unit body in that assigned to a roller or a group of rollers in each case is a spring element, which is acted upon by fluid, for the suspension thereof with respect to the roller unit body.

A rotary shock absorber for a vehicle and a pneumatic spring, in particular for a rotary shock absorber, are disclosed. The rotary shock absorber for a vehicle comprises a first component and a second component, wherein the second component is rotatably arranged relative to the first component. The rotary shock absorber comprises a pneumatic spring that is adapted to provide an elastic force F against rotation of the second component relative to the first component. The second component forms a pneumatic cavity of the pneumatic spring. The second component forms a hydraulic cavity of the pneumatic spring. The hydraulic cavity comprises a toroidal section.