湿式离合器欠约束摩擦副临界碰摩转速及带排转矩分析

Analysis of Critical Rub-Impact Speed and Drag Torque of Unconstrained Friction Pair in Wet Clutch

带排转矩会降低湿式离合器的传动效率,缩短其使用寿命和降低其工作可靠性。目前针对湿式离合器带排转矩的研究大多基于平均间隙分布模型,但各摩擦副之间的间隙分布对带排转矩有重要影响,且获取处于工作状态的湿式离合器各摩擦副间隙分布是很困难的。因此,本文提出了一种湿式离合器各摩擦副间隙分布的仿真模拟方法,采用次序统计方法模拟各摩擦片和钢片的位置,获得各摩擦副初始间隙分布规律;在此基础上,通过仿真分析不同工况下欠约束多摩擦副系统的临界碰摩转速及带排转矩,并通过了试验验证。结果表明,在湿式离合器总间隙不变的情况下,欠约束多摩擦副系统的临碰摩转速小于基于平均间隙分布假设下的临界碰摩转速;随着湿式离合器总间隙的增加,临界碰摩转速逐渐下降;欠约束多摩擦副系统的带排转矩明显大于基于平均间隙分布假设下的带排转矩,随着湿式离合器总间隙的增加,带排转矩逐渐下降。

The drag torque can reduce the transmission efficiency of the wet clutch,shorten its service life and reduce its working reliability.At present,most of the research on the drag torque of wet clutch is based on the average gap distribution model,but the gap distribution between the friction pairs has an important impact on the drag torque,and it is difficult to obtain the gap distribution of each friction pair of wet clutch in working state.There‐fore,this paper proposes a simulation method for the clearance distribution of friction pairs in the wet clutch,in which the order statistics method is used to simulate the position of each friction plate and steel plate to obtain the initial clearance distribution law of each friction pair.On this basis,the critical rub-impact speed and drag torque of the unconstrained friction pair system under different working conditions are analyzed by simulation,and verified by test.The results show that when the total clearance of the wet clutch is constant,the critical rub-impact speed of the unconstrained multi friction pair system is less than the critical rub-impact speed based on the assumption of aver‐age clearance distribution.With the increase of the total clearance of the wet clutch,the critical rub-impact speed decreases gradually.The drag torque of the unconstrained multi friction pair system is significantly greater than that based on the assumption of average clearance distribution.With the increase of the total clearance of the wet clutch,the drag torque gradually decreases.