The phenomenon of timing gear vibration is intensified in diesel engine. In order to analyze the effect of the timing gear phase coefficient on the timing gear vibration, a dynamic model of the crankshaft gear pair in timing gear system was established by considering the time-varying stiffness, damping, error and gear backlash. The effects of meshing stiffness, meshing damping, gear backlash and meshing error of including phase coefficient on the maximum vibration displacement and the load sharing coefficient of the crankshaft gear pair in timing gear system were analyzed, and the effects of all time-varying factors including phase coefficient on the maximum displacement and load sharing coefficient were also analyzed. The results show that the time-varying factors of including phase coefficient have important effects on the maximum vibration displacement and the load sharing coefficient. Among all the effect factors, the meshing error is the largest, the meshing stiffness and gear backlash are the second, the meshing damping has almost no effect. When all time-varying factors are considered, with variation of the angular, the difference of the maximum displacement and its minimum value is 6.9% and the difference of the maximum load sharing coefficient and its minimum value is 11.8%. In addition, the maximum displacement and the load sharing coefficient take larger values when the phase coefficient is around (0.30, 0.70), and take smaller values when the phase coefficient is around (0.50, 0.50), or (0.97, 0.03). © 2020, Editorial Office of the Transaction of CSICE. All right reserved.
