行星齿轮式转向机构设计的研究

A Research on the Design of Planetary Gear Steering Mechanism

为设计出合理的行星齿轮式转向机构,首先分析了转向机构的工作原理和设计参数的影响;然后根据车辆动力学和四轮转向技术等相关理论,以零质心侧偏角控制策略为目标,分析了车辆在不同转向情况下前后轮的转角关系,确定了转向机构的设计参数;最后以某车辆为例,设计出合理的转向机构,建立了该车的虚拟样机模型并进行了操纵稳定性仿真,结果表明,行星齿轮式转向机构能大大提高车辆低速时的机动性和高速下的操纵稳定性。

For designing rational planetary gear steering mechanism, firstly the working principle of steering mechanism and the influences of design parameters are analyzed. Then based on related theories of vehicle dynamics and four-wheel steering with a control strategy of zero sideslip angle at mass center as objective, the relationships be- tween the rotation angles of front wheels and rear wheels in different steering conditions are analyzed, and the design parameters of steering mechanism are determined. Finally taking a vehicle as an example, a rational steering mecha- nism is designed, a virtual prototype model for that vehicle is set up, and a simulation on its handling stability per- formance is conducted. The results show that the planetary gear steering mechanism can greatly enhance the maneu- verability of vehicle at low speed and the handling stability at high speed.