The wheel electric car, small size, light weight thanks to the wheel hub motor instead of the general motors, installed in the wheel, so wheel electric car has its own unique structural characteristics. Finite element method has been applied in the automotive industry is now very extensive, the finite element method to analyze the body frame is very effective on the body structure through static analysis, its evaluation, analysis of its strength, stiffness and other structural characteristics, obtained the stress distribution and body deformation for the back to provide the basis for the design and production.As a light magnesium alloy material, should be applied to the car, the fact is true. How can the wider use of magnesium alloys and other lightweight new materials for automotive help will be the future direction of development. In this paper, urban office workers as the main object, to design a two-seater electric car wheel, the first feature based on their market position and the wheel itself, structural features of electric vehicles designed to meet the requirements of the body shape, and in the CATIA model of the platform to establish Body Frame application CATIA FEM module on the overall framework for mesh-type body, the boundary conditions and simplified, and load distribution. Combination of vehicles in the actual running conditions, conditions for the bending load, full load condition and reverse bending condition of the calculation and analysis, the finite element analysis to identify the structural characteristics of the frame and the weak link, found that the body basically meet requirements. Combined with the characteristics of magnesium alloy, and integral body with the status of magnesium alloy were analyzed and found to reverse the condition, the local stress is too large, need to improve the structure. In this paper some of the work done for the future of wheel electric vehicle body structure designed to provide some reference, and in the use of magnesium alloy material to draw some guidance on the data for reference.
Keywords: wheel electric vehicles, the overall body, finite element, magnesium alloy
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