一切自行式车辆和工程机械，都离不开转向即行走方向控制。转向系统有机械式和液压控制式。
Steering control, that is, the walking direction control, is necessary for all self-walking vehicles and engineering machinery.
在轮式工业车辆的机械式转向操纵系统中，联系转向器与梯形机构的纵拉杆机构，在构造上属于含有两个球铰和两个圆柱铰的RSSR机构。
The four-bar linkage included in the mechanical steering system of industrial vehicles is composed of the crank of steering gear, longitudinal connecting rod, the arm on kin pin and frame.
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