【摘要】 以某乘用车驱动桥壳为例,根据减薄后桥壳在台架试验时发生断裂失效的情况,建立了桥壳的有限元模型,并进行静力学分析和疲劳分析,得出在钢板弹簧座附近应力出现集中。提出了在钢板弹簧座附近位置添加衬环的方法,并基于二次响应曲面法进行了优化设计,确定衬环厚度为6 mm、长度为80 mm、安装位置为距桥壳片外端部90 mm时响应值最小。轻量化前后桥质量减轻了3.2 kg,减轻约为14.2%,效果明显。通过对比桥壳改进前后的有限元分析得出:添加衬环后驱动桥壳应力明显降低,安全系数提高显著,并通过台架试验验证了改进措施的正确性和有效性。更多还原

【Abstract】 The lightweight design is of great significance to the design of auto parts.For example,based on the failure of the reducing rear axle shell of the passenger vehicle in the bench test,the bridge shell finite element model is established.And it was obtained that appear stress was concentrated near the steel plate spring seat after the analysis of statics and fatigue.Method of adding the backing ring in the spring seat near the location is proposed.Then the design based on the quadratic response surface method was optimized,concluding when the thickness of lining ring is 6 mm,length is 80 mm,and the installation position is 80 mm,the response values are minimized.Obviously lightweight rear axle mass was reduced by 3.2 kg,about 14.2%.Compared the finite element analysis before and after the improvement of axle shell,it was found that drive axle shell stress is decreased obviously after adding lining ring,and the safety coefficient increased significantly.The correctness and effectiveness of improvement measures was verified through the bench test.更多还原