汽车断开式转向梯形机构的优化设计

The automobile separation type steering trapezium organization optimization designs

基于空间几何关系推导出某汽车断开式转向梯形机构的运动学方程,以转向梯形中各个杆件的空间尺寸、空间位置等参数为设计变量,以跟踪理想阿克曼转角为目标函数,以车辆对转向系统的要求为约束条件,对该转向梯形机构进行优化设计。基于ADAMS的虚拟样机试验表明:优化后的转向梯形机构明显地提高左右轮转角跟踪理想阿克曼转角的能力。在转向过程中,传动比变化更为合理,压力角更好满足机械系统传递要求。

It presents a method to optimize a certain splitting Ackerman steering linkage through deducing the 3-dimension kinematic equations, applying the structure parameters of steering linkage as the design variables, using the ideal Ackermann angle and the vehicle＇s available space as objective function and constraint condition respectively. The test with the Adams virtual prototype model shows that the optimized steering trapezium mechanism remarkably improves the performance of the steering angles on both sides tracking the ideal Ackermann angle, rationalizes the variability of the transmission ratio during cornering and better satisfies the requirement on the pressure angle of the mechanical system.