高速工况下湿式离合器带排转矩特性的仿真与试验研究

Simulation and Experimental Study on the Drag Torque Characteristics of Wet Clutches in High Speed Condition

为研究传统带排转矩模型无法预测的湿式离合器高转速工况下带排转矩回升的特性规律,建立了考虑沟槽和温度效应并包含气液两相的带排转矩数学模型,对模型的分析结果表明,高速工况下,摩擦片与钢片间隙润滑油膜厚度减小造成带排转矩回升的趋势。同时,建立VOF两相流模型,以仿真分析气液两相体积分数的分布规律。最后,针对不同工况进行了相关试验,分析了转速、带排间隙、润滑油流量、润滑油温度、摩擦材料和沟槽等因素对湿式离合器带排转矩的影响规律。

In order to study the characteristic rule of wet clutch,i.e.the drag torque rises again in high speed range,which traditional model cannot predicts,a mathematical model with gaseous and liquid two phases is established with consideration of the effects of grooves and temperature,and the analyses on the model reveal that the drag torque shows a certain rise trend again when the speed reaches specific value due to the reduction of oil film thickness in the gap between frictional linings and steel disks.Meanwhile two-phase volume of fluid model is also set up to simulate the distribution rule of the volume fraction of air and oil two phases.Finally,tests on different conditions are conducted to analyze the effects of factors such as speed,drag gap,oil flow rate,oil temperature,frictional material and grooves on drag torque.