公开(公告)号：US3856102A

公开(公告)日：1974-12-24

申请号：US37812573

申请日：1973-07-11

申请人： HARNISCHFEGER CORP

发明人： QUEEN W

IPC分类号： B62D5/26 ,  B62D7/14 ,  B62D7/15 ,  B66C23/80 ,  B62D5/08

CPC分类号： B66C23/80 ,  B62D7/1509 ,  B62D7/1572

摘要： A rough terrain vehicle comprises a chassis, a pair of driven steerable frontground wheels and a pair of driven steerable rear ground wheels mounted on the chassis, an engine on the chassis and an upper unit rotatably mounted on the chassis. A movable boom and an operator''s cab, in which vehicle and boom controls are located, are mounted on the upper unit. An electro-hydraulic steering system is provided and comprises, among other things, a separate steering cylinder for each of the four ground wheels, engine-driven hydraulic fluid pumps and a fluid reservoir, solenoid operated valves for controlling fluid flow to the steering cylinders and to certain other vehicle components, a steering wheel mechanism, and a selector switch. The selector switch and steering wheel mechanism are used cooperatively by the vehicle operator to enable three modes of steering, namely: normal steering in either direction using the front wheels only; tight steering in either direction using the front wheels and rear wheels turned in opposite directions; and crab steering in either direction using the front wheels and rear wheels turned in the same direction.

摘要翻译： 崎岖的地形车辆包括底盘，一对可驱动的可操纵的前轮和一对安装在底盘上的可驱动的可转向的后地面轮，底盘上的发动机和可旋转地安装在底盘上的上单元。 在上部单元上安装有可动吊杆和车辆和吊杆控制装置所在的驾驶室。 提供电动液压转向系统，其中包括用于四个地面轮中的每一个的独立的转向缸，发动机驱动的液压泵和流体贮存器，用于控制流向转向缸的流体的电磁阀， 到某些其他车辆部件，方向盘机构和选择器开关。 选择器开关和方向盘机构由车辆操作员协同使用，以实现三种转向模式，即：仅使用前轮在任一方向正常转向; 使用前轮和后轮在相反方向转动，在任一方向上紧紧转向; 并且使用前轮和后轮沿相同方向转动，在任一方向上的螃蟹转向。