| 摘要 |
This invention concerns an arrangement (1) intended to be mounted at a vehicle (2) intended for forestry, comprising a load-bearing part (3) and driving bogie wheels (4) where the arrangement (1) comprises at least two extra wheels (5) that can be individually controlled in the vertical direction where each extra wheel is arranged at a shaft (6) that is fixed and that is not rotatable, pivotable, and is arranged at the bogie box (7) of the vehicle in order to distribute the weight of the machine. The individually controlled extra wheels (5) are subject to a driving force and mounted at at least two arms (12) arranged at the bogie boxes of the vehicle, that a track (18) is placed around each set of bogie wheels (4) and the extra wheel (5) in order to protect against skidding and to distribute the weight, reducing the ground pressure and that a tension arrangement (19) in the form of a cylinder under pressure or a coiled spring unit is arranged at each arm in order to absorb motions in the length of the arm (12) such that the length of the track does not change when the arm (12) moves up and down. The invention concerns also a vehicle (2) comprising such an arrangement (1). |
