基于流体动力学的湿式离合器拖曳扭矩模型

Modeling of Drag Torque of Wet Clutch Based on Fluid Dynamics

为解决湿式离合器分离状态下拖曳扭矩造成离合器功率损失的问题,提高自动变速器传动效率,从拖曳扭矩产生机理出发,建立湿式离合器分离状态下润滑油流体动力学模型,通过仿真分析湿式离合器拖曳扭矩关键影响因素,着重探讨了摩擦片波纹度的影响。仿真结果表明:增加摩擦片表面沟槽、波纹度可有效降低湿式离合器拖曳扭矩,此外,增大摩擦片与对偶钢片间隙、降低润滑油粘度和减少供油量也有助于降低拖曳扭矩。

In order to solve the problem of clutch power loss caused by drag torque of disengaged wet clutch,improve transmission efficiency of automatic transmission,firstly the mechanism of drag torque is analyzed,a hydrodynamic model of lubricating oil of the disengaged wet clutch is established.Then through simulation analysis of the key influential factors of wet clutch drag torque,the effect of waviness of friction plate is mainly explored.The simulation results indicate that increasing surface groove and waviness of friction plate can effectively reduce the drag torque of the wet clutch.In addition,increasing the clearance between the friction disk and the separated steel disk,reducing lubricant viscosity and oil supply can also help to reduce the drag torque.