控制油压对湿式多片离合器分离动态特性的影响  

Influence of the Control Oil Pressure on the Dynamic Characteristics of a Wet Multi-disc Clutch in the Disengaging Process

作　　者：郑良杰 马彪[1] 陈漫[1] 于亮[1] 张存振 ZHENG Liangjie;MA Biao;CHEN Man;YU Liang;ZHANG Cunzhen(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《兵工学报》2022年第10期2451-2459,共9页Acta Armamentarii

基　　金：国家自然科学基金项目(51975047、51775045)。

摘　　要：湿式多片离合器分离过程的持续时间、转矩变化和间隙分布会影响车辆换挡品质。考虑摩擦副间流体动压润滑、微凸体弹塑性接触、花键摩擦力以及活塞回位之后与离合器毂的碰撞,建立湿式多片离合器分离过程动力学数值模型,研究六摩擦副系统在不同初始控制油压和油压下降速率下的动态分离过程,提出了不均匀系数以表征分离间隙均匀度。研究结果表明:油压下降速率的减小显著延长了分离过程持续时间,恶化了分离间隙均匀度,减缓了粗糙接触转矩的下降,增大了分离过程中的黏性转矩;而初始控制油压对分离过程持续时间和分离间隙均匀度影响较小,但初始控制油压的增加增大了粗糙接触转矩的初始值和衰减速率,并减小了分离过程中的黏性转矩。During the disengaging process of a wet-multi clutch,the disengaging time,the friction torque and the friction pair gaps have a dramatic influence on the shifting quality of the vehicle.Thus,a comprehensive dynamic model is proposed to investigate the clutch disengaging process,which includes hydrodynamic lubrication,elastic-plastic contact between asperities,spline friction,and impact between piston and clutch hub.The influence of control oil pressure and its decreasing rate on the disengaging performance of a six friction-pair wet clutch are studied,and the non-uniformity coefficient is employed to characterize the disengaging uniformity.The results show that the decline in the pressure s decreasing rate not only prolongs the disengaging time,but also deteriorates the disengaging uniformity dramatically.Moreover,the decline in contact torque is retarded and the viscous torque is increased.However,the initial value of control oil pressure has a slight influence on the disengaging time and uniformity.The rise in control oil pressure increases the initial contact torque and its decreasing rate,and also decreases the viscous torque.

关 键 词：湿式多片离合器 分离特性 控制油压 摩擦转矩 摩擦副间隙 

分 类 号：U463.211[机械工程—车辆工程]