花键摩擦对湿式多片离合器分离过程影响

Influence of spline friction coefficient on a wet multi-disc clutch in the disengaging process

摘要:

为研究在不同花键摩擦因数下湿式多片离合器分离过程中的摩擦转矩和间隙变化,建立湿式多片离合器分离过程动力学数值模型,并提出不均匀系数以表征分离间隙均匀度。研究结果表明:分离过程中各摩擦副间隙首先缓慢增大,再迅速增大,剧烈波动之后趋于稳定；间隙稳定之后分离过程结束,而花键摩擦因数对分离过程持续时间几乎没有影响；不考虑花键摩擦时,各摩擦副均匀分离；考虑花键摩擦后,各摩擦副间隙从第一副至第六副依次减小,花键摩擦因数的增加显著恶化了分离间隙均匀度；分离过程的粗糙接触转矩初始值及其衰减速率随花键摩擦因数的增大而减小,分离过程末期的黏性转矩随花键摩擦因数的增大而增大。因此降低花键摩擦因数,有助于湿式多片离合器的均匀分离和降低带排转矩。

Abstract:

To study the variations of friction torque and gaps during the disengaging process of a wet multi-disc clutch with different spline friction coefficients, a comprehensive disengaging dynamic model is proposed, and the non-uniformity coefficient is employed to characterize the disengaging uniformity. The results show that during the disengaging process, the friction pair gaps first increase slowly, then increase rapidly, finally stabilize after fluctuating. The disengaging process ends when the friction pair gaps stabilize, but the spline friction coefficient has slight effect on the disengaging time. When considering the spline friction, the disengaged gaps are no longer uniform, but decrease from the first friction pair to the sixth friction pair in sequence. Moreover, the increase of spline friction coefficient significantly deteriorates the disengaging uniformity. Finally, with the increase of spline friction coefficient, the initial value and change rate of contact torque decrease, while the final value of hydrodynamic torque increases. Therefore, the decrease of spline friction coefficient promotes the uniform disengaging of friction pairs and reduces the drag torque.