基于改进最佳极限偏差法的弧面凸轮机构公差分配研究

基于空间啮合理论推导了含误差的弧面凸轮机构啮合方程,采用微分分析法推导了影响弧面凸轮机构运动精度的各误差因素的影响系数表达式。结合各误差影响系数,探讨了弧面凸轮机构的简易公差分配法,然后综合考虑加工成本、尺寸因素、装配性能等工程实际，提出了弧面凸轮机构改进最佳极限偏差公差分配法。用这两种方法对某型弧面凸轮机构进行了公差分配，结果表明采用改进最佳极限偏差法更为合理。对弧面凸轮机构的公差分配进行了有益的探索,同时也为其他空间共轭传动机构的公差分配提供了一定的借鉴。

Research on Tolerance Allocation of Globoidal Cam Mechanism Based on Improved Optimal Limit Deviation Method

Based on the meshing theory, the meshing equations of a globoidal cam mechanism with error were deduced. By using the differential method, the motion accuracy influence coefficient expressions of the globoid cam mechanism were obtained. Firstly a simple tolerance allocation method was proposed. Then the improved optimal limit deviation tolerance allocation method was proposed by comprehensively considering the processing cost, size and the assembly performance of practical engineering. On the basis of that, the globoidal cam mechanism tolerance allocation problems were discussed. Targeted to a specific globoidal cam mechanism transmission system example, the tolerance distribution problems were solved by using two methods. The results show that the improved optimal limit deviation method is reasonable. A tolerance allocation method is provided for the globoidal cam mechanism, and provides reference for other spatial conjugate transmission mechanism tolerance allocation.