润滑剂的黏弹性与动压力对圆柱滚子轴承打滑的影响

摘要

为了建立准确的圆柱滚子轴承动力学模型,研究润滑剂的不同流变模型以及流体动压力对轴承的动态特性的影响,并将模型的数值结果与已有的实验结果进行比较.研究结果表明:当相对滑动速度较大时,基于牛顿流体的摩擦力计算结果较实际值大,基于非线性流变模型的数值结果与实验结果更吻合;不同的流变模型和流体动压力计算方法对滚子与滚道的相对滑动速度影响较大,采用B-W模型和HOUPERT流体动压力更能真实反映轴承的动态特性.%In order to establish an accurate dynamic model of cylindrical roller bearing, the effects of different rheological models of lubricant and hydrodynamic pressure forces on dynamic characteristics of bearing were studied. The numerical results of dynamic model were compared with the experimental data. The results show that the friction force based on Newtonian fluid is larger than the actual value when the relative sliding velocity is high, and the numerical calculation results are closed to the experimental results when the nonlinear rheological characteristic is involved. Different rheological models and hydrodynamic formulas have significant effects on relative slip velocity between the roller and races. Meanwhile, the skidding model involving B-W traction model and HOUPERT's hydrodynamic pressure force can reflect the realistic dynamic characteristics of bearing.