FE Analysis And Lightweight Design About City Bus Vehicle Drive Axle Housing

Drive axle housing as one of the important parts of the automobile,supports the main reducer,half shaft,brakes and other parts,not only bear the weight of the body and the crew,take the car,the vehicle load transfer to car tires,but also bear the drive from the lateral force and the wheel came from a vertical force,power and their anti torque,and the suspension to the car frame and car body.In the process of moving car,city bus running conditions,overcrowding is a common phenomenon,after the drive axle is affected by the impact of alternating load between wheel and ground,will cause the bridge shell deformed or broken.Therefore,the rear drive axle housing must have sufficient strength and stiffness.In order to improve the comfort of the whole vehicle,the quality of the rear axle housing should be reduced as much as possible in order to improve the ride comfort.Since the national guidance on the implementation of the city public transport priority development,the rapid development of city bus(bus),the bus production enterprises take the city bus sales as a business growth,in accordance with the principle of resource conservation and environmental protection,energy saving and emission reduction as the focus,vigorously develop low carbon,high efficiency,large capacity of the city public the traffic system,the bridge shell as an important component,the market demand is big,its weight determines the size of the whole axle weight,directly affect the vehicle performance and emissions.Therefore,this paper takes the urban bus driving axle housing as the object of study.The focus of this paper is:Based on the finite element static analysis,dynamic analysis and the structure optimization theory,the CAD software UG and finite element analysis software Hypermesh combined,completed from the drive axle 3D modeling to the whole process of finite element analysis,obtained in the drive axle under four typical conditions should be the stress distribution and deformation resultsin the free state and it constraints the first 14 order natural frequency and vibration mode,the calculation proves that the axle housing to meet the strength requirements,it can be thought of as a reliable car in various driving conditions,and will not cause resonance.On this basis,the application of Hypermesh optimization module to optimize the structure of the bridge,the optimization results show that the shell quality have been significantly reduced,the maximum equivalent stress is close to the allowable stress,greatly improves the utilization rate of materials,and the stress distribution is more reasonable.In this paper,with the aid of the project progress,the bench test before and after the optimization of the axle housing is compared,and the conclusions which are beneficial to the engineering practice are obtained.The results show that the CAD modeling technology and CAE analysis technology can significantly improve the design level of automobile drive axle housing,shorten the design cycle,reduce development costs and improve product competitiveness.The method is universal and can be used as a reference for the design and analysis of other types of drive axle housing.