花键摩擦对湿式多片离合器分离过程影响

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.