Study of Gear Meshing Efficiency of Electric Drive Axle with Considering System Deformation

doi:10.3901/JME.2023.03.066

Abstract

Abstract: Transmission efficiency is one of the important performance indicators of the electric drive axle. In actual working conditions, there is a meshing misalignment between gear pairs due to the load deformation of gears, shafts, bearings and housings. In order to accurately predict the meshing efficiency of the electric drive axle, this research proposed a calculation method of the electric drive axle gear meshing efficiency considering the system deformation. First, based on the equivalent meshing model of the drive train, the meshing misalignment between each gear pair in the system under different load conditions is calculated, and the friction-based loaded tooth contact analysis method (FLTCA) and the mixed lubrication friction coefficient model are used to analyze the system. The tooth surface contact force and the tooth surface friction coefficient distribution are calculated, and the system power loss and meshing efficiency are obtained. Then, under the condition of constant friction coefficient, the calculation results of commercial finite element software are compared to verify the accuracy of the calculation results. Finally, the meshing efficiency of the system with and without considering the system deformation is analyzed for different load conditions and different speeds. The results show that as the torque increases, the system deformation increases, and the amount of misalignment between gear pairs increases, which in turn leads to an eccentric load occurs between the gear pairs, the friction coefficient of the tooth surface increases, and the meshing efficiency of the system shows a downward trend.

Key words: electric drive axle, system deformation, misalignments, mixed EHL, meshing efficiency, loaded tooth contact analysis

CLC Number:

TG156

WANG Qin, HE Di, GUI Liangji, FAN Zijie. Study of Gear Meshing Efficiency of Electric Drive Axle with Considering System Deformation[J]. Journal of Mechanical Engineering, 2023, 59(3): 66-75.

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