考虑界面接触状态的湿式离合器扭矩特性

为提升重型车辆传动系统中湿式离合器可靠性及使用寿命,建立了考虑界面接触状态的湿式离合器扭矩模型,通过模型研究了不同参数对离合器扭矩特性的影响规律。首先,对湿式离合器进行仿真模拟,增加界面接触状态参数,搭建湿式离合器充油模型与结合模型。其次,基于SAE#2试验台开展湿式离合器扭矩试验,将仿真获得的结果与离合器试验数据进行对比,验证了仿真模型的有效性。最后,结合模型研究了油压、油温和碟形量对湿式离合器扭矩特性的影响规律。结果表明:考虑了界面接触状态的模型相较于传统模型具有更高的准确性,提高了22.30%；随着控制油压的减小,离合器的总扭矩降低,当压力从1.5 MPa减小到1.0 MPa时,扭矩峰值降低了22.38%,同时制动时间延长了46.05%；润滑油温度对离合器的黏性转矩和摩擦扭矩都具有一定程度的影响,温度越高,黏性转矩越小,摩擦扭矩越大,整体制动时间稍有减小；摩擦片碟形量对离合器扭矩的影响主要体现在扭矩产生时间,碟形量的增加会导致离合器制动时间增加。

Torque characteristics of wet clutches considering interface contact state

To improve the reliability and service life of wet clutches in heavy-duty vehicle transmission systems, a wet clutches torque model considering interface contact state was established. The influence of different parameters on the clutch torque characteristics was studied through the model. Firstly, a simulation and modeling approach was employed to simulate the wet clutch, incorporating interface contact state parameters,and establishing a wet clutch oil charging model and a combination model. Secondly, a wet clutch torque test was conducted on the SAE#2 test bench, and the simulation results were compared with the clutch test data to verify the effectiveness of the simulation model. Finally, the influence of oil pressure, oil temperature, and disc shape on the wet clutch torque characteristics was studied using the combined model. The findings indicate that model considering interface contact states has higher accuracy compared to traditional models, with an improvement of 22.30%. As the control oil pressure decreases, the total torque of the clutch decreases. When the pressure decreases from 1.5 MPa to 1.0 MPa, the peak torque decreases by 22.38%, and the braking time extends by 46.05% simultaneously. The temperature of lubricating oil has a certain degree of influence on the viscous torque and frictional torque of the clutch. The higher the temperature, the smaller the viscous torque, the greater the frictional torque, and the overall braking time slightly decreases. The impact of friction disc shape on clutch torque is mainly reflected in the time of torque generation, and an increase in disc shape leads to an increase in clutch braking time.