二齿差摆盘式活齿传动的接触力学

Contact mechanics of two-tooth-difference oscillating-disc movable teeth transmission

针对二齿差摆盘式活齿传动系统在高速重载的工作条件下容易产生局部的挤压变形或疲劳磨损等问题,依据二齿差活齿传动的对称性,对二齿差摆盘式活齿传动系统的模型进行简化,并运用有限元分析方法计算各零件在接触点附近的等效应力。研究反映传动动态过程的活齿相位以及活齿振幅、活齿半径、沟曲率半径系数等参数对接触应力的影响。应用接触力学的经典理论,研究接触点次表面不同类型应力的分布状态,并且在静强度校核的基础上对系统进行疲劳分析,计算接触疲劳寿命,确定系统可能疲劳失效的危险区域。研究结果表明:各零件的应力均集中在接触点附近的微小区域内,分布状态符合预期,属于典型的接触问题,同时验证了差异化网格划分的合理性;振幅增大、活齿半径增大、沟曲率半径系数减小均会导致接触应力最大值的减小,反之亦然。

For the two-tooth-difference oscillating-disc movable teeth transmission system,it is easy to produce local crush deformation or fatigue wear under the working conditions of high speed and heavy load.According to the symmetry of the two-tooth-difference movable teeth transmission,the model of the two-tooth-difference oscillating-disc movable teeth transmission system was simplified,and the equivalent stress of each part near the contact point was calculated by the finite element analysis method.The phase of the movable tooth reflecting the dynamic process of the transmission,as well as the influence of the parameters of the movable tooth amplitude,the movable tooth radius and the groove curvature radius coefficient on the contact stress were studied.The classical theory of contact mechanics was used to study the distribution of different types of stress on the surface of the contact point.And based on the static strength check,the system was analyzed for its fatigue,contact fatigue life and the danger area of its pessible fatigue failure.The results show that the stress of each part is concentrated in the tiny area near the contact point,and the distribution state is in line with the expectations.It is a typical contact problem,and the rationality of differential meshing is verified.The increase of amplitude,the increase of the radius of the movable tooth,and the decrease of the radius of curvature of the groove all lead to the decrease of the maximum contact stress,and vice versa.