某金属带式无级变速器振动仿真分析与多工况下试验验证

Simulation analysis of a metal band CVT transmission and experimental verification under multiple working conditions

为分析某金属带式无级变速器(CVT)振动产生机理,采用集中参数法建立双级行星齿轮非线性扭转动力学模型,应用四阶龙格库塔方法进行动态响应求解,利用ADAMS软件进行动力学仿真,对动态响应进行验证,进行CVT振动台架试验测试。研究结果表明:四阶龙格库塔方法与ADAMS动态仿真得到的动态响应结果基本一致;台架试验结果表明前进挡转速为2500 r/min时,低速挡输入轴轴向位置的振动加速度最大为0.623 m/s^(2),转速为1000 r/min时,低速挡输入轴轴向位置的加速度最大为0.309 m/s^(2);倒挡工况下,转速为2500 r/min时,倒挡输入轴轴向位置的振动加速度最大为0.703 m/s^(2),转速1000 r/min时,倒挡输入轴轴向位置的加速度最大为0.504 m/s^(2);倒挡工况下的振动加速度幅值比前进挡高12.85%;倒挡阶次谱中54.4阶和108.8阶振动信号最为明显,挡位切换过程中双级行星齿轮啮合次数增多,啮合间隙是CVT在倒挡动力传递中振动增大的主要原因。

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/s^(2),and when the speed is 1000 r/min,the maximum acceleration at the axial position of the input shaft of the low-speed gear is 0.309 m/s^(2).Under the condition of reverse gear,when the rotational speed is 2500 r/min,the maximum vibration acceleration of the axial position of the reverse gear input shaft is 0.703 m/s^(2).When the rotational speed is 1000 r/min,the maximum acceleration of the axial position of the reverse gear input shaft is 0.504 m/s^(2).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.