两挡AMT斜齿轮弯扭轴耦合非线性振动特性分析

In a two-gear pair AMT of pure electric vehicle, nonlinear vibration of helical gear transmission system can cause vibration and noise of the transmission. Here, in order to study nonlinear vibration characteristics of the two-gear pair AMT helical gear system, considering time-varying meshing stiffness, tooth side clearance, static transmission error and bearing support stiffness of the system, the bending-torsion-axis coupled dynamic model of the system was established to analyze bifurcation diagram and its phase diagram features of the coupled vibration characteristics. The results showed that when the transmission is operating with the first gear pair, the meshing frequency increases with increase in speed, and the system has periodic motion and chaos; when the load-bearing gear pair is in a single-period motion, torsional vibration intensity of the gear pair without load-bearing increases with increase in speed; appropriately increasing gear pair mesh damping ratio and meshing stiffness is helpful to reduce the amplitude of the maximum torsional vibration point of the load-bearing gear pair; the study results can provide a technical support for structural design, dynamic analysis and gearshift application of two-gear pair AMT of pure electric vehicle.