基于Carreau流变模型的圆柱滚子轴承热混合润滑分析

Analysis of Thermal Mixed Lubrication of Cylindrical Roller Bearings Based on Carreau Rheological Model

为了研究圆柱滚子轴承接触区的混合润滑性能,建立基于Carreau非牛顿流体的热混合润滑模型,求解非牛顿流体线接触热混合润滑数值解。研究滑滚比、卷吸速度及载荷对线接触混合润滑特性的影响,并与相同工况下牛顿流体热混合润滑的结果进行对比。结果表明:随着滑滚比、卷吸速度及载荷的增大,油膜温度都会升高,Carreau非牛顿流体的温度要低于牛顿流体的温度;油膜厚度随着滑滚比、载荷的增大而减小,随着卷吸速度的增大而增大,Carreau非牛顿流体与牛顿流体膜厚相差不大;随着滑滚比的增大,2种流体的平均摩擦因数均增大,随着卷吸速度和载荷的增大,2种流体的载荷比均减小。

In order to study the mixed lubrication performance of cylindrical roller bearing in contact area,a thermal mixed lubrication model based on Carreau fluid was established,and the numerical solution of non-Newtonian fluid line contact mixed lubrication was solved.The effects of slide-roll ratio,entrainment speed and load on the characteristics of line contact mixed lubrication were studied and compared with the results of Newtonian fluid mixed lubrication under the same working conditions.The results show that the oil film temperature increases with the increase of slide-roll ratio,entrainment speed and load,and the temperature of Carreau non-Newtonian fluid is lower than that of Newtonian fluid.The oil film thickness decreases with the increase of slide-roll ratio and load,and increases with the increase of entrainment speed.There is little difference of oil film thickness between Carreau non-Newtonian fluid and Newtonian fluid.With the increase of slide-roll ratio,the average friction coefficient of the two fluids increases,with the increase of entrainment speed and load,the load ratio of the two fluids decreases.