Optimal Design Of Gear Parameters And Research Of Tooth Tip Modification In Wheel Reducer

With China's rapid development of mining industry,such as coal, iron core and other mineral resources , the demand of advance mining and transportation equipment is also growing, mining motor wheel dump truck is one of the representative products. Wheel reducer is a key component of a mining motor wheel dump truck, which is expected to become more compact, lighter, and run more smoothly,so optimal design of gear transmission parameters of the wheel reducer and improving of its mechanical properties are done,which is very important for improving working performance of mining motor wheel dump truck.In this paper, the wheel reducer of mining motor wheel dump truck of a company is the research object.Theoretical analysis and numerical simulation is done about the wheel reducer from the following four aspects: optimization modeling of the gear transmission parameters, solution method of the optimal design model, analysis of tooth dynamic load, optimization of tooth tip modification. The main works as follows:(1) Establishing the optimal design model of gear parameters in the wheel reducer.According to the design requirements and the actual manufacturing conditions,a optimal model is established,in which the design variables are gear module, number of teeth, gear modification coefficient and working tooth width, and the constraints are teeth,basic design variable,transmission performance,gear strength,addendum thickness and so on ,and the design objective is total mass of the gear drive system of the wheel reducer.(2) Finding solution method of the optimal design model and optimal design of the wheel reducer. The solution method of feasible enumeration method combined with genetic algorithm is proposed based on the characteristic of discrete variable and continuous variable in the optimal design model of the wheel reducer. Then,the optimal model is solved by adopting MATLAB programming,and its optimal parameters value and objective function value are gained, and a optimal design of the wheel reducer is gained.(3) Multi-body dynamics simulation of gears and analysis of tooth dynamic load factor.Tooth dynamic load analysis model based on multi-body dynamics of centre gear and big star gear in the wheel reducer is built in multi-body dynamics simulation software ADAMS. Dynamic load course and its coefficient in meshing progress is obtained by simulation analysis, which are good consistent with theoretical analysis. The study provides a theoretical basis for the further research of tooth tip modification.(4) Gear tip modification parameter optimization. A second-order response surface model is established between the amount of gear tooth tip modification and tooth dynamic load factor by using experiment design method. The optimal amount of gear tooth tip modification is obtained when tooth dynamic load factor to minimum is as the optimization objective. The dynamic load characteristics of modificatd tooth is improved compared with that of normal tooth.In this paper, through establishment of wheel reducer optimization model, the wheel reducer is optimized;through gear multi-body dynamics simulation and optimal design of amount of gear tooth tip modification,tooth dynamic load characteristics is improved.It provides a theoretical basis and practical reference for optimization of parameters of gear drive system in wheel reducer and optimization of amount of gear tooth tip modification.