载荷对油膜界面滑移及弹流润滑特性的影响研究

Study on Influences of Load on Oil Film Interface Slip and Elastohydrodynamic Lubrication Characteristics

为探究恶劣工况下机械传动系统中摩擦副润滑失效的形成和演变机理,建立考虑油膜界面滑移的点接触弹流润滑模型,进行仿真计算,并开展双色光干涉弹流润滑试验,研究载荷对弹流润滑中油膜界面滑移的影响,进而研究界面滑移状态下卷吸速度、流体动压、油膜厚度、滑移参数等随载荷的变化特性。研究结果表明:随着载荷的增大,界面滑移幅度和滑移范围均显著增大,滑移区域卷吸速度明显下降,滑移区域动压分布趋于均匀,滑移区域产生膜厚堆积并出现入口凹陷特征,滑移区域形状逐渐呈“半月牙形”特征。

In order to explore formation and evolution mechanism of lubrication failure of friction pair in mechanical transmission system under harsh working conditions,a point contact elastohydrodynamic lubrication model was established considering oil film interface slip,and simulation calculation was carried out.The two-color light interference elastohydrodynamic lubrication test was carried out to study the influences of load on oil film interface slip in elastohydrodynamic lubrication,and then variation characteristics of entrainment velocity,hydrodynamic pressure,oil film thickness and slip parameters with load were studied under interface slip state.The results show that with the increase of load,the slip amplitude and slip range of interface increase significantly and the entrainment velocity in slip region decreases obviously.The dynamic pressure distribution in slip region tends to be uniform.In addition,slip region produces film thickness accumulation and inlet depression characteristics.The shape of slip region gradually presents the characteristics of“half crescent”.