双横臂独立悬架转向梯形机构断开点的优化

利用D-H坐标系建立双横臂独立悬架四杆机构各杆的杆坐标系，求出各个杆坐标系之间的转换矩阵，对双横臂独立悬架进行位移分析，确定车轮跳动时前束变化量的关系式，同时考虑汽车在转向时，内外车轮转角应尽可能地符合Ackerman转向几何条件。综合这两个关系求得转向梯形断开点位置的确定方法、通过实例验证了这个方法的有效性。此法简单明了，易于编程。

Optimization of splitting point of Ackerman steering linkage in double wishbone independent suspension

Based on the rules of D-H coordinate, each member coordinate for the four-bar linkage of the double wishbone independent suspension is set up, and the transformation matrices between those coor-dinates are derived. The displacement of the dual wishbone independent suspension is analysed, and a formula of toe-in change for the jump of the wheel is derived. By considering that the steering angles of outside and inside wheels should approximate the ideal relationship of Ackerman steering geometry, a method for determination of its Ackerman steering linkage is obtained. At last, an example is given to verify its validity. This method can be used easily without solving the systems of quadratic equations with three variables, and is especially suited for programming.