无过约束自调机构允差分析的一种精确方法

An Accurate Method of the Analysis of Allowable Error for the Self-adjustable Mechanisms Without Overconstraint

针对现有方法在自调机构的允差分析时对机构圆柱副中的自调位移规律假设的可行性问题 ,利用矢量旋转的数学方法建立了机构圆柱副中自调位移方程 ,并对自调位移进行编程计算和绘制自调位移曲线 ,结果表明上述假设是可行的 ;在建立的自调位移方程基础上 ,提出了一种确定机构能够实现自调的允许误差角的精确方法。实例分析结果表明提出的方法是正确、有效的。

Aiming at the problem of the feasibility of the supposed self adjusting displacement equation when using the present method in the analysis of allowable errors for self adjustable mechanism with the mathematic approach of rotating vector, the authors establish the self adjusting displacement equation in the cylindrical pair, and calculate the self adjusting displacement to draw out the curve of the displacement by programming. The above results show that the suppose mentioned previously is feasible. Base on the equation established, an accurate method is used to determinate the allowable error angles which can make the mechanism realize self adjustment presented. By analyzing the results of the example, the method presented is proved to be correct and effective.