Nonlinear dynamics analyses of gear shifting with gear vibrations
SUI Liqi1, TIAN Feng1, LI Bo1, ZENG Yuanfan1, TIAN Guangyu1, CHEN Hongxu2
1. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China; 2. Yibin Fengchuan Power Technology Co., Ltd., Yibin 644600, China
Abstract：The dynamic characteristics of a sleeve and a gear ring during shifting of an electric drive mechanical transmission were studied using a nonlinear dynamic model that included the coupled vibrations of the drive gears. The model used a nonlinear contact model to describe the impact of the sleeve and the gear ring during engaging with nonlinear vibrations of the drive gears with clearances described using the concentrating mass method of gear dynamics. The two nonlinear processes were coupled by the dynamics equations. The various engaging conditions of the sleeve and the gear ring were summarized into five states with their coupled dynamics equations. Then, the dynamic characteristics of the system were simulated using the Runge-Kutta method. The results are consistent with experimental data. Analyses of the impact force between the sleeve and the gear ring shows that with even only a slight difference between the relative rotational speed and the contact angle, the impact force can reach 23 800 N. The results are of great significance for optimizing sleeves and gear rings for improving gear shifting quality.
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2020, Vol. 60 
