湿式离合器摩擦片磨损量计算方法与试验研究

Research on wear calculation method and experiment for friction disc of wet clutch

湿式离合器是现代大功率车辆传动系统中的核心部件,在长时间工作或者极限工况条件下,容易发生由异常摩擦造成的摩擦片表面烧蚀、打滑、断裂和塑性变形等故障,为提高离合器使用寿命和可靠性,基于微凸体弹塑性接触模型以及湿式离器工作原理,推导建立了考虑弹塑性接触的摩擦片磨损量计算模型,确定了离合器摩擦片磨损量与载荷、滑磨速度之间的定量数学关系,并在湿式离合器磨损实验台上进行了磨损试验,验证了理论模型的准确性和有效性。研究结果显示:工作油压在0.2~0.4 MPa时,磨损较小,同时模型精度较高,相对误差小于5%;压力为0.4 MPa是一个临界值,在压力大于0.4 MPa时,磨损量将急剧增大。因此,为了更好地控制磨损,应当将压力控制在0.4 MPa左右,表明所建立的考虑弹塑性变形磨损量计算模型能够有效的预测摩擦片磨损量,为离合器寿命评估和摩擦片减磨耐磨设计提供了数据的支持。

Wet clutch is one of the most important components in vehicle transmission system,under long time working condition or limit operating condition,abnormal friction,such as surface rupture, skid,ablation and plastic deformation, will cause wet clutch to failure. In order to improve the reliability of wet- clutch,the wear calculation model considering the elastic-plastic is derived based on the elastic-plastic model theory and the working mechanism of wet- clutch. The quantitative mathematical relations between operation conditions （ pressure,sliding speed） is determined. Furthermore,wear test is carried out on the wet clutch test rig and the experiment results verify the accuracy and effectiveness of theoretical model . The study shows that the wear is less when the control pressure is 0. 2 -0. 4 MPa and the error is less than 5 % ; The wear volume will increase sharply when the pressure is higher than 0.4 MPa,and it indicates that 0. 4 MPa is a critical value.The result presents that the pressure shall be around 0. 4 MPa in order to control the wear. The wear capacity calculation model can be used to predict the reliability of wet clutch friction plate and wear resistance design.