计入箱体轴柔性的主减齿轮系统振动特性研究

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Abstract The main reduction gear system is an important transmission component of an automobile transmission, and it is also the main cause of vibration and noise of the cabinet. In order to indicate the vibration characteristics of the main reduction system by the internal and external dynamic excitation, a bending-torsion-shaft-pendulum fully coupled kinetic equation is established by the finite element discretization modeling method which discrete the box-shaft into the shaft section and couple it with the input and output shaft section units, gear meshing unit and bearing unit. The box-shaft flexibility, the time-varying meshing stiffness of the helical gear with large coincidence and the static transmission error excitation is considered in the model and the numerical solution is adopted to get inherent characteristics and vibration response characteristics of the system. The research results show that the low-order natural frequency of the system is slightly reduced after the box-shaft flexibility is taken into account, but new natural frequencies and vibration modes are added. By the increase of the speed, there is an obvious order amplitude increase in 1 and 2 times meshing frequency, and an obvious resonance response is appeared when the speed reaches 4900rpm. The result also shows that the increase in external load mainly leads to the rise of the vibration amplitude in non-resonant zone. When the combination of different end-face contact degree and axial contact degree is selected, or the axial contact degree is increased within a certain range, the fluctuation of time-varying meshing stiffness of helical gear can be effectively reduced and the vibration displacement amplitude near the resonance point can be improved.

Key words： main reduction gear system time-varying mesh stiffness flexible shaft contact ratio vibration response

Received: 22 November 2021 Published: 28 January 2023

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	Articles by authors
	ZHOU Lijie1
	CHEN Kai1
	FAN Yongqi2
	CHAI Zhaopeng2
	WANG Yiwen1

Cite this article:

ZHOU Lijie1,CHEN Kai1,FAN Yongqi2, et al. Vibration characteristics of a main reduction gear system considering box-shaft flexibility[J]. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(2): 267-275.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2023/V42/I2/267

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