汽车驱动桥壳有限元分析及结构改进  

Finite Element Analysis and Structure Improvement of Truck Driving Axle Housing

作　　者：吴孝泉[1] 

机构地区：[1]江西科技学院教务处,江西南昌330098

出　　处：《机械传动》2016年第11期131-134,共4页Journal of Mechanical Transmission

摘　　要：为了验证某卡车驱动桥壳的工作特性，基于有限元方法对其驱动桥壳进行强度分析，当其6倍满载轴荷时，其最大应力超过材料抗拉极限，通过增大桥壳的倒角并且垂直距离提高10mm优化之后，其最大应力为549．0MPa，降低了10％。采用．S-N方法对该驱动桥壳的优化方案进行疲劳寿命预测分析，其最小寿命为1．57×10^6次，大于国标要求的8×10^5次。优化之后的桥壳的第一阶自由模态频率和第一阶约束模态频率分别为101．5Hz和125．9Hz，均处于驱动桥旋转激励频率范围之外，将会有效避免其发生共振。优化之后驱动桥壳的每米最大变形为1．097mm／m，小于国标要求的1．5mm／m，因此其优化方案的刚度、模态、强度及疲劳均满足要求。Aming at verifying the working characteristics of a truck driving axle housing, the strength of rear axle is analyzed based on the finite element method, the analysis result shows that maximum stress beyond material tensile strength when it was 6 time full loading. The maximum stress is 549.0 MPa by increasing cham- fer and increasing 10 mm at vertical distance, it is reduced by 10%. The fatigue life of front axle is predicted based the method of S - N, the result shows that the minimum life is 1.57 × 10^6, it exceeds the national standard of 8 ×10^5 cycles. The first free modal frequency and first constraint modal frequency are 101.5 Hz and 125.9 Hz after optimization. They are outside the range of excitation frequency of engine idle speed, and the resonance would be effectively avoided. The maximum displacement of per meter is 1. 097 mm/m, it less than 1.5 mm/m of national standards, so its optimization meet the requirement of stiffness, modal, strength and fatigue.

关 键 词：驱动桥壳 强度 疲劳 模态 刚度 

分 类 号：U463.218.5[机械工程—车辆工程]