The present invention relates to a heavy-duty vehicle combination or a heavy-duty vehicles compound, such as for example tractors train, trailer power vehicles, trailer train or platforms train, particularly with turnable flat bed or platform vehicles supported by a plurality of axles or wheel groups and with at least partially driven axles or wheel groups by an additional drive on the load carrying vehicles.
Heavy-duty vehicle systems of the above mentioned general type are known in the art. With heavy loads, particularly loads which must be transported with consideration of special regulations or particular permission on street vehicles, it is in general not effective to transport the working load exclusively on pulled or pushed vehicles, trailers, etc., inasmuch as a tractor or a pushing vehicle which is the only driven vehicle in system must be loaded with high ballast weight in order to guarantee traction and friction loads required for movement of the vehicle combination.
The German patent 841,850 discloses trailer vehicles whose wheels are driven hydraulically by a motor unit arranged on a tractor, which in accordance with the power requirements can be turned on individually or in a parallel operation. In this construction it is not possible to change the ratio of the drive power supplied to the individual vehicles of the vehicle compound.