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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10 mm优化之后,其最大应力为549.0 MPa,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101.5 Hz和125.9 Hz,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1.097 mm/m,小于国标要求的1.5 mm/m,因此其优化方案的刚度、模态、强度及疲劳均满足要求。
In order to verify the working characteristics of a truck driven axle housing, the strength of the driving axle housing is analyzed based on the finite element method. When the axle load is 6 times full, the maximum stress exceeds the material tensile limit, and by increasing the chamfer of the axle housing and After the vertical distance was increased by 10 mm, the maximum stress was 549.0 MPa, a reduction of 10%. The S-N method is used to predict the fatigue life of the optimized design of the transaxle case. The minimum life expectancy is 1.57 × 10 ~ 6 times, which is larger than the national standard of 8 × 10 ~ 5 times. The optimized first-order free mode frequency and the first-order constrained mode frequency are 101.5 Hz and 125.9 Hz, both of which are outside the range of the driving spur rotation excitation frequency, so as to effectively avoid resonance. After optimization, the maximum per-meter deformation of the axle housing is 1.097 mm / m, which is less than 1.5 mm / m required by the national standard. Therefore, the stiffness, modality, strength and fatigue of the optimized solution meet the requirements.