| 摘要 |
A vehicle (10) with a driving track assembly (26) and a pair of secondary driving assemblies (36) disposed on opposing lateral sides of the track. Each secondary driving structure includes a ground engaging driving structure that is preferably a ground engaging wheel. The driving track assembly includes an endless ground engaging track that drives the vehicle. The flanking driving structures also engage the ground and are rotated to impart a force to the vehicle. A steering device (45) is operatively connected to the secondary driving assemblies so as to affect a vehicle steering operation wherein the ground engaging driving structures are operated to turn said vehicle with respect to the vehicle driving direction. Preferably, the force imparted to the vehicle by one of the ground engaging driving structures is greater than the force imparted to the vehicle by the other of the ground engaging driving structures, thereby causing the vehicle to turn with respect to the vehicle driving direction.
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