Dynamic analysis of double-helical gear system considering effect of oil film among meshing teeth

Minghu Yin,Jinzhong Zuo,Yahui Cui,Xiangjun Meng,Yuhao Qi

doi:10.1177/1687814020920117

Minghu Yin, Jinzhong Zuo + Show 3 more

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https://doi.org/10.1177/1687814020920117

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Abstract

The oil film among meshing teeth is just like a spring-damping element, and it can dominate the friction and meshing characteristics of the gear pair and influence its dynamic performances further. Thus, this article focuses on a double-helical gear system and makes efforts to consider the effect of the oil film among meshing teeth more deeply, which can enhance the precision of dynamic analysis for the gear system. First, based on the elasto-hydrodynamic lubrication theory and “microtomy” method, the models of friction and meshing characteristics are developed including the friction state and spring-damping effect of the oil film among meshing teeth; then, the dynamic models of the double-helical gear system with the effect of the oil film among meshing teeth are established, and finally, the experiments are carried out to verify the value of the models developed in this article. According to the theoretical and experimental analyses, it can be seen that the dynamic model considering the effect of the oil film among the meshing teeth is more precise and practical, and the effect of the oil film should be considered in the dynamic analysis of the gear system, especially at the condition with heavy load or high speed.

Highlights

The gear system is widely applied in various mechanical engineering fields to transmit motion and power
Considering the time-varying meshing stiffness and damping in the WL-model and IL-model only, at the input torque Tp = 200 N m and input rotating speed np = 5000 r/min, Figure 3 shows the dynamic performances of the DH gear system along the LOA direction under the excitations of time-varying meshing stiffness and damping with/without the effect of the oil film; the calculated results of the TE-model are given in the figures
Considering the friction of the gear pair in the WLmodel and IL-model only, Figures 5 and 6 show the dynamic performances of the DH gear system along the LOA direction under the friction excitation with/ without the effect of the oil film; the calculated results of the TE-model are given in the figures

Summary

Introduction

The gear system is widely applied in various mechanical engineering fields to transmit motion and power. With the increase in rotating speed and power density, the problems of the vibration and noise of the gear system cannot be neglected, which are caused by the internal and external excitations such as the time-varying meshing stiffness and transmission error,[2] and make the dynamic analysis becomes a major interest in the gear industrial sector. Lots of research studies have been carried out on the dynamic analysis and lubrication design of the gear system. The research studies on the gear dynamics start from a spring-mass model proposed by Tuplin in 1950.

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