基于有限元的RV减速器关键结构分析

Analysis of the RV Reducer Key Structure Based on Finite Element Method

RV减速器作为一种精密传动机构,掌握其关键零部件的受力与变形状态对整机的设计与制造十分重要。采用有限元方法分别计算了RV减速器关键零部件摆线针轮机构和偏心轴机构的应力和变形。计算结果表明:摆线针轮机构和偏心轴机构的接触应力和等效应力均远远小于相应材料的强度,这说明强度不是RV减速器零部件设计、制造过程中主要考虑的问题;偏心轴机构的刚度小于摆线针轮机构,对减速器整机的传动精度影响较大,对于摆线轮,则需根据变形情况合理选择修形方法和修形量,以提高刚度,从而提高减速器整机的传动精度.

The Rotate Vector(RV)reducer is a precise transmission mechanism,to understand the stress and deformation state of key components are very important to design and manufacture the machine.The stress and deformation of key parts of the RV reducer were calculated by finite element method(FEM)respectively,including the stress and deformation of cycloidal-pin wheel and eccentric shaft.The results show that the structural contact stress and equivalent stress of cycloidal-pin wheel and eccentric shaft are far less than the strength of corresponding materials.It means that the strength is not the main consideration of problem in designing and manufacturing process.The stiffness of eccentric shaft mechanism is less than that of the cycloidal-pin wheel,which has a great influence on the transmission accuracy of the machine.In order to improve the rigidity so as to improve the transmission accuracy of gear reducer machine,the modification methods and modification quantity must be chosen properly to design by the deformation.