全程转速下浮动支撑湿式离合器带排转矩计算模型与验证

A theoretical model is established for the analysis of offset state of friction elements under the condition of low speed difference based on the gyro effect. As for the gap shrinkage under the condition of high speed difference, a negative pressure contraction model for friction pairs is built by analyzing the oil film and the pressure on friction plates. The dynamic change of gap between the friction pairs in the whole variation range of the relative speed is then investigated. Finally, an improved model, considering the influence of dynamic change of gap between the friction pairs, is proposed to study the drag torque. The simulated and test results indicate that, under the condition of the same lubrication, the drag torque of the wet multi-plate clutch increases first and then decreases and finally increases with the rise of the rotational speed difference. The main factors influencing the drag torque are the offset of friction plate under the condition of the low speed difference (0-1 000 r/min), and the gap shrinkages under the condition of the middle and high speed differences (>1 000 r/min). Through the comparison of test results and the simulated results obtained from the improved model, the average relative error is only 6.34% under the condition of medium and high speed differences (>1 000 r/min), which can greatly improve the estimation accuracy of drag torque of wet multi-plate clutch.