汽车减速器箱体静力学分析及疲劳寿命计算

Static Analysis and Fatigue Life Calculation of Automobile Reducer Case

摘要: 针对汽车减速器箱体在运行工况下易产生疲劳失效问题，首先建立某车型减速器箱体有限元模型，对该模型进行模型简化、网格划分创建约束条件以及材料属性的添加，采用刚性连接单元将减速器箱体连接起来组成减速器箱体有限元模型，选择箱体额定工况并根据传动系统静力学分析得到轴承X、Y、Z方向三分力结果，进行箱体静力学分析，得到减速器箱体的位移和应力云图，通过Adams对箱体传动系统进行动力学仿真，得到箱体轴承座在额定工况下的仿真载荷，施加载荷并通过名义应力法进行箱体的疲劳寿命计算，根据箱体材料的S-N曲线以及疲劳累积损伤理论得到箱体疲劳寿命结果，观察箱体不同位置的损伤情况，为后续箱体结构优化进行参考。

Abstract: Aiming at the problem of fatigue failure of automobile reducer box in operation condition, the finite element model of a vehicle reducer box was established first. The model was simplified, mesh was divided to create constraint conditions and material attributes were added to the model. The rigid connection unit was used to connect the reducer box to form the finite element model of the reducer box. Select the rated working conditions of the box and obtain the results of the three- component forces in the direction of X, Y and Z according to the statics analysis of the transmission system. Car-ry out the statics analysis of the box and obtain the displacement and stress nephogram of the re-ducer box. Conduct the dynamics simulation of the box drive system through Adams to obtain the simulation load of the box bearing seat under the rated working conditions. Load was applied and the fatigue life of the box was calculated by the nominal stress method. The fatigue life of the box was obtained according to the S-N curve of the box material and the theory of fatigue cumulative damage. The damage of the box at different positions was observed, which was a reference for the subsequent optimization of the box structure