某汽车悬架纵臂衬套疲劳寿命优化设计

Design of Vehicle Suspension Trailing Arm Bushing Fatigue Life Optimization

汽车悬架纵臂衬套的疲劳耐久特性对汽车的舒适性和操控性起着重要作用。为了解决纵臂衬套在路试中出现的开裂问题,从疲劳寿命预测的基本思想出发,提出了解决方案。通过衬套耐久仿真分析,找出了衬套容易出现开裂的位置,通过减小衬套橡胶圆角部分应变的大小,使得衬套疲劳寿命提高到原来的近2倍。衬套台架试验和道路试验验证表明,结构优化后的衬套满足整车性能要求。本衬套疲劳寿命优化设计方法可为汽车其他零部件的疲劳寿命设计提供参考。

T he fatigue life of vehicle suspension trailing arm bushing plays an important role in vehicle comfort and handling.From the basic idea of fatigue life prediction, the solution for crack problems of trailing arm bushing in the road test is put forward.The position where the trailing arm bushing is easy to crack is found using the bushing durability simulation analysis. Reducing the strain of the rubber rounded part in the bushing nearly increases 2 times of the fatigue life of the bushing. It is proven that the optimized bushing meets the vehicle performance requirements through the validation of the bushing bench test and road test. The optimization method of fatigue life can provide some reference to other automobile parts in the fatigue life design.