Design And Research Of Electric Wheel For The Road-rail Vehicles

The road-rail dual-use vehicle with electric wheel has compact structure,simple operation,flexible control,high transmission efficiency advantages,etc.In the field of road-rail vehicles,electric wheel has good using prospect.At present,the road-rail dual-use vehicle is mainly driven by the internal combustion engine.A small amount is the battery-driven from the foreign countries.There are few data that driver element of the road-rail vehicle electric wheel is independently researched and developed in domestic,and design technology is not yet perfect.Therefore,designing a kind of electric wheel with reliable performance and flexible control,which has great significance to promote road-rail vehicles development of driving technology.Electric wheel is used in the road-rail vehicles,which is different from the electric car.Its structure size is affected by the working environment,and it is also required to meet the high efficiency and low cost,small volume,convenient control and flexible operation.In this paper,according to the operating performance,working conditions and application requirements of the LGTD2001 road-rail dual-use vehicle,the structure design of its electric wheel is carried out.As the core component of electric wheel drive,the reducer needs to be analyzed for its strength check and fatigue reliability.Static analysis,fatigue analysis and modal analysis of the assembly are carried out by using the finite element method in order to improve the transmission efficiency and prolong the service life.According to the results of finite element analysis,stress and strain,fatigue life,natural frequency and vibration modes of the reducer planetary gear train are analyzed in the transmission process.The analysis result guides rational design of the electric wheel,meets the actual requirement,and has important significance for improving the working stability and transmission efficiency of the electric wheel.The gears are transmitted by the engagement of the gear surfaces,which involve the analysis of contact problems.So the finite element method is used to simulate the contact of gear structure.Based on the results of finite element analysis,the distribution of the maximum contact stress and the transmission process of the contact surface are further analyzed.And the contact stress of the tooth surface is calculated by using the Hertz formula,which is being compared and analyzed with the simulation results.It fully shows that the finite element algorithm is more convergent than the theoretical calculation,and the accuracy is higher and the time is shorter.ANSYS software is used to study and analyze gear contact problem,it can more fully reflect the dynamic changes of the gear mechanism in the transmission.Electric wheel's design principle is lightweight structure,small volume,compactstructure.Reducer as the main components of electric wheel,so its size will affect the overall structure size of the electric wheel.The MATLAB software is used as the toolbox of solving the problem of the optimization design of reducer.Taking the volume and contact ratio as multi-objective optimization function,then the multi-objective optimization problem is transformed into single-objective problem to solve by the linear weighted method.The mathematical model is established by using the safety factor method and other constraints.The optimal solution is obtained through Fmincon function optimize calculation and analysis.The optimized volume is significantly reduced and contact ratio is also increased.The optimization load capacity and reliability of the reducer is higher,so that the weight of the reducer can be reduced.It is of great engineering significance to improve the economic benefit and reduce the cost in practical production.