| The drive axle housing is the main transmitting power and carring loads and carrying component, it not only supports the weight of automobile and transmits loads to cartwheels at the same time, but also stands the opposite force of tractive force, braking force, lateral force and vertical force as well as the counter torque transmitted by drive wheels. Because the driving condition of the vehicle is very complex, the strength and dynamic performance of the drive axle housing directly affect the operation safety of the vehicle. The reasonable design of the drive housing is one of the important ways to improve the ride comfort. Thus, it is necessary to analyze the strength, stiffness and dynamic performance of the drive axle housing.At present, the research and analysis of the axle house is mainly based on uniform cross section at domestic and foreign, but thatof variable cross-section axle house is relatively scarce. Though variable cross-section structure design has been used to foundry axle house, it is still blank in punching-welding axle house. the design and analysis for variable cross-section axle house are conducted based on analysis and calculation of uniform cross-section axle house in this paper, which provides the theoretical basis for the further study on the variable cross-section axle house.For the uniform cross-section axle house, its local stress is not smooth, the stress concentration phenomenon can be produced. Being aimed at this phenomenon, the variable cross-section axle house was put forward , which initially solved the stress distribution that is not reasonable, and had the good stiffness, strength and dynamic characteristics.The following work is finished in this paper:Firstly, the solid model of drive axle housing was built by PRO/E software, and the original certain details of the axle housing was simplified, to improve the efficiency of the processing and the solution of finite element. Then, it was inserted into ANSYS Workbench, the finite element model was built.Secondly, the finite element model of the axle housing is plotted in girding form an analyzed by ANSYS Workbench, the equivalent stress and deformation of axle house in five typical working conditions are obtained; According to the analysis result, structure optimization is proceeded , and then the variable cross-section axle house ia put forward which analyzed, compared with the uniform cross-section one, there is a significant improvement of strength and rigidity.Thirdly in order to decide whether there is unfavorable to the vibration mode of vehicle operating and avoid adverse resonance phenomenon to appear, the modal analysis is conducted by ANSYS Workbench, and the formation are got, research bridge housing structure and resonant characteristics of the relationship, for welding bridge housing improvement design of providing a certain reference for further study, as well as the vibration of the bridge housing mechanism and vibration suppression technology provides theory basis.Forthly,transient danamic analysis of the variable cross-section axle house was made,and got the displacement and stress time response valu of the axle housing under a function load ,and obtained stress distribution and chang rule of the axle housing at a certain time.Fifthly,fatigue life analysis of the drive axle housing was done based on the results of its danamic analysis by finite element mothod(FEM),and got the integral distribution of fatigue life of the axle housing.The results indicated that its dangerous sections mainly lied in the leaf-spring seat area ,which were basically the same with the bench test results. |
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