Mechanical Property Study And Structure Optimization Of Vehicle Drive Axle Housing

With the development of lightweight technology,the technology has been increasingly applied in auto industry.The implementation of the automotive light weighting,not only can reduce energy consumption,also can improve the fuel economy of vehicles.At the same time,the automobile rear axle housing is support vehicle load and pass it to an important part of a wheel.Mechanical properties of the rear axle housing have a major impact on the performance of car use,therefore,the rear axle housing need to have good static and dynamic mechanical properties.With the progress of computer technology,finite element technique in design and analysis of driving axle housings got more extensive attention and application.In a light vehicle driving axle housings to lightweight as the goal,using the finite element method for the structure analysis of mechanical properties and dimension optimization,for its lightweight design provides a new method of optimization.First of all,to verify the finite element method to the design parameters of a model bridge housing,its three-dimensional model is established.Finite element model is established and the modal analysis,the analytical results compared with the experimental results,which verify the accuracy of the finite element method.Secondly,on this basis,the static and dynamic mechanical properties of a light vehicle driving axle housing,its strength and stiffness meet the design requirements.Through the analysis of driving axle housings under the free modal frequency and vibration mode,the minimum order is bridge housing and pavement resonance will not occur.Then,on the basis of statics analysis was carried out on the rear axle housing fatigue strength analysis and life prediction of its fatigue damage position and life expectancy.Comprehensive various analysis above the rear axle housing has a larger space structure optimization.Finally,based on the above analysis,the rear axle housing lightweight structure design.The Box-Behnken design method,experiments of different thickness of the rear axle housing static and dynamic mechanical properties were analyzed.The results of the analysis on its mechanical properties,the response surface method was used to construct the bridge housing quality as the objective function,to wheel track deformation and maximum stress for optimal approximate model of constraint functions.In accuracy and precision of the response surface model,under the condition of rear axle housing parts,the optimal parameters are obtained.And the optimized rear axle housing statics and dynamics analysis,shows the optimized structure can well satisfy the use requirement.Rear axle housing quality reduced 2.91 kg,lightweight effect is obvious,for the subsequent real vehicle rear axle housing structure parameter optimization to provide the reference.