In allusion to a truck transmission gears, a nonlinear vibration model of transmission gears was constructed based on the theory of gear system dynamics and nonlinear dynamics. Basing on the computing platform Matlab and using the Runge-Kutta method to calculate the time history response of gear vibration when the gap exists, and the case of non-resonant and load gear backlash vibration frequency of gear changes were studied. The results of this paper have an important significance to improve the movement of transmission gears to pass accuracy, reduce noise, reduce failures and increase gear life.
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