Optimization Design Of Electric Wheel Wheel-side Reducer And Finite Element Analysis

Electric wheel is a new type of driving technology for new energy vehicles, with power, high efficiency and low cost. The spatial dimension of Electric wheelis limited, and compact wheel reducer cansignificantly enhance theover all performance of theelectric wheel. Therefore, Studies of theelectric wheelgearoptimization designand finite elementanalysisare mportantsignificancefor promoting the development ofelectric-wheel-drive technology.This paper first reviewed the development of electric-wheel-drive technology, and make a summary of its developing trend. Based on the current development of new energy vehicles and electric-wheel-drive technology, thewheel-side reducer for electric wheel type is investigated. the advantages of the NGW planetary gear of wheel reducer is described, the structural requirements of the NGW planetary gear reducer for electric wheel is analyzed,where the optimization of radial and axial dimensions is extremely significant in practical application. therefore, in this paper, the research target and project content are confirmed using theoretical study and computational simulation method, the main work and achievementsare as follows.Mechanical optimization designis introduced and fundamental concept, theory and algorithm of contact problem in finite element method are studied.Optimization design of NGW planetary gear in wheel reducer is established. Mathimatical model is built in the study and the objective functions of this optimization design are minimum center distance and tooth width. According to the structural and kinetic characteristics of planetary gear, constrain conditions of the optimization design are provided and the computational procedures of strength constrain condition are introduced in detail. Based on Branch and Bound Algorithm, epicyclic gear transmission is divided into several pairs of meshing gears, which is a useful method for investigating.The formula of fixed axial gear transmission is applied in the calculation and the structural and kinetic characteristics of planetary gear is considered as well. The optimization design procedure is studied and described, which is based on the objective functions of minimum center distance and tooth width. Comparing with the previous optimization method which considered the discrete variable as continuous variable, in this paper, the problem of rounding the design variable is avoided using current optimization design algorithm and procedure, which is more appropriate for gear optimization design with mixed variables.According to optimization algorithm and design procedure, modular design method is adopted to study the optimization design flow. Based on the M language, a new optimization design program is compiled and described in this paper. In order to demonstrate practical applicability of the optimization algorithm, this paper gave full consideration to the actual situation of project applications. The new optimization sotfware is developed under Matlab platform. In order to verify the original optimization design software, examples are applied in the program. The analysis results demonstrate that the new optimization design method and program have good optimization effects,with a certain amount of value in engineering.3D modeling software is applied to built the parametric models with several optimization design data, and gear contacting and bending stresses is obtained from the finite element analysis with ANSYS. According to the comparision of simulation and analytical results, the feasibility of the optimization algrithm, procedure and program is demonstrated. And the optimization sotfware shows good practical applicability.