| Cylindrical gear split-torque transmission system has many advantages,such as higher reliability,lower noise,lighter weight and lower energy loss.It has wide application prospect in aviation,ship and other fields.Load sharing performance is one of the key technologies for the split-torsion system.The analysis of static and dynamic load-sharing characteristics of cylindrical gear split-torque transmission system can provide guidance for its design and manufacture,and is of great significance for promoting the development and application of split-torque transmission system.This paper conducts research on the calculation and analysis of mesh stiffness and other parameters of spur gears based on loaded tooth contact analysis(LTCA),and the analysis of static and dynamic load-sharing characteristics of split-torque transmission system.The main contents and achievements of the research works are consist of the follows as below:1.The finite element model of spur gear is established and the calculation method of the deformation influence coefficient matrix are put forward.The distance of corresponding point on the tooth surface is calculated based on gear contact analysis.Based on the deformation influence coefficient matrix and distance matrix,two kinds of LTCA models are established.The mesh stiffness and contact stress of the gear are calculated by the model,and the effects of wheel flange thickness,web thickness,and different contact models on mesh stiffness are analyzed.2.Statics model of the 2-input cylindrical gears split-torque transmission system is established,and static equilibrium equations of the system are deduced and solved.Thus,load-sharing coefficients of each branch of the system are obtained.Influences of centre space error,coaxial error and gear side clearance on static load-sharing characteristic are analyzed.3.Considering the time-varying mesh stiffness,time-varying friction coefficient,rotor excitation and output shaft bending stiffness,dynamic model of the system is developed based on the theory of lumped parameter method.The dynamic differential equations of the whole drive system were derived.Fourier series method is used to solve the dynamic equations,and the dynamic load-sharing coefficient is obtained.The variation of the dynamic load-sharing coefficient of each branch before and after the rotor excitation is considered and the influence of the torsional stiffness and the supporting stiffness on the dynamic load-sharing coefficient are analyzed.The results show that the rotor excitation will cause low-frequency fluctuation of load-sharing coefficient and worse load sharing performance.The torsional stiffness of double gear shafts has great impact on the load-sharing coefficient of the system. |
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