Research On The Load Sharing And Fatigue Life Estimation Of Wheel-Side Reducer

The wheel-side reducer of the driving axle is an important component of the wheel loadertransmission. The effects of the reducer are decelerating the rotation speed to multiply thetorque and optimization the power matching of the transmission system. The transmissionperformance determines the traction performance and the reliability of the parts. The normaloperation of the wheel-side reducer planetary gear is the precondition of the wheel loaderoperation and reducing the economic loss. This paper primarily researches the planetary gearand simulates the fatigue life base on the probability statistic and the mechanical fatigueanalysis theory. Meanwhile the effects of the gear number on the load sharing performance ofthe planetary gear are researched.Based on the actually measured loads of the wheel loader half shaft under the multipleloading conditions, the load single is processed by the statistical analysis and the subsectionsynthesis. Then the six operation sections load spectrum according to working condition arecompiled based on POT method.According to the software named ROMAX, the fatigue life of epicycle gear is predicted,the life of sun gear is4875hours and the life of the planet is7535.1hours. The simulated lifeis more than the physical life. Moreover this paper studies the influencing factors on the gearsuch as the load, the tooth root filter, the roughness of the tooth root filter and the meshmisplacement.The tooth face contact stress and the tooth root bending stress of the sun gear, the planetand ring gear are computed by the static finite element analysis, simultaneously this paperstudies the tooth number having the influence on the stress distribution and calculates thefactor of the load anis-sharing. The results show that the tooth number has an important effecton the gear stress and the load sharing. This paper imposes a matching method of the planetarygear, namely the tooth number of the sun gear and ring gear is integral multiple of the planetnumber.An improved scheme of the planetary gear is improved, which has the similar tooth stressand structure size compared to the original, the tooth number of the sun gear is16and the ringgear is64, both is the integral multiple of the planet number. Through the dynamic analysis of the two planetary gear, the temporal variation laws of some factor are found including thetooth foot filter of the sun gear, the mesh force of the planet, the sun gear offset and the loadsharing factor. The analysis results are that the planet loads of the improved are shared and thelargest tooth foot bending stress is reducing about20%. The new planetary is better than theoriginal.The research of this paper is a practical work. Load spectrum tabulated is the basic datafor the gear design and fatigue life prediction. The fatigue life prediction results provide thetheoretical basis and reference significance for the fatigue design and maintenance support ofthe wheel-side reducer, and the sensitivity analysis of the gear supply the theoreticalfoundation for improving the design and processing technology. Also this paper study theinfluence of the gear teeth number on the planet load sharing, then promote an advanced teethnumber matching method.