全齿轮系的三维有限元循环对称及接触应力分析

本文首次以完整的减速器齿轮系作为有限元应力分析对象。利用齿轮系的循环对称性取其一个基本段作为计算模型,同时还考虑了啮合齿牙间的接触传力。所考虑的载荷即有扭矩又有离心力。通过一次分析可获得整个齿轮系各部位的应力。

3-D FINITE ELEMENT CYCLIC SYMMETRICAND CONTACT STRESS ANALYSISFOR A COMPLETE GEAR TRAIN

A complete gear train of a reduction gearbox is the object of finite elementstress analysis. One of the basic segments of the complete gear train is taken as the computational model in the light of the cyclic symmetry of the gear train, meanwhile the contact transmission forces between the corresponding meshed teeth are considered in the analysis of the model. For simplicity the corresponding meshed lines are used instead of the actual contact surfaces. Both torque and centrifugal loads are involved in the analysis. The stresses in all the parts of a complete gear train can be determined by one analysis. The computed results show that the contact force on a meshed tooth is correlative not only to the length of the meshed line, but also to its position, and, moreover, the neglect of the stress resulted from centrifugal load is inappropriate to a high speed gear train.