In order to analyze the vibration mechanism of a metal belt continuously variable transmission,the nonlinear torsional dynamic model of two-stage planetary gear is established by using the lumped parameter method.The dynamic response is solved by using the fourth-order Runge-Kutta method.The dynamic simulation is carried out by using ADAMS software.The dynamic response is verified and the CVT shaking table test is carried out.The results show that the fourth-order runge-kutta method is basically consistent with the dynamic response results obtained by ADAMS dynamic simulation.The bench test results show that when the forward speed is 2500 r/min,the maximum vibration acceleration at the axial position of the input shaft of the low-speed gear is 0.623 m/s2,and when the speed is 1 000 r/min,the maximum acceleration at the axial position of the input shaft of the low-speed gear is 0.309 m/s2.Under the condition of reverse gear,when the rotational speed is 2 500 r/min,the maximum vibration acceleration of the axial position of the reverse gear input shaft is 0.703 m/s2.When the rotational speed is 1 000 r/min,the maximum acceleration of the axial position of the reverse gear input shaft is 0.504 m/s2.The amplitude of vibration acceleration under reverse gear condition is 12.85%higher than that under forward gear condition.The vibration signals of 54.4 and 108.8 orders in the reverse gear order spectrum are the most obvious.The increase of the meshing times and the meshing clearance of the two-stage planetary gear during the gear shifting process are the main reasons for the increase of the vibration of CVT in the reverse gear power transmission
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