线接触脂润滑弹流润滑分析  

Elastohydrodynamic Lubrication Analysis on Line Contact Lubricated with Grease

作　　者：薛虎[1] 汪久根[1] 洪玉芳 

机构地区：[1]浙江大学机械工程学院,浙江杭州310027

出　　处：《润滑与密封》2017年第9期12-16,33,共6页Lubrication Engineering

基　　金：国家自然科学基金项目(51375436);国家高技术研究发展计划项目(863计划;2015AA043002);浙江省重大科技专项(2016C01G5130970)

摘　　要：工程中大多数滚动轴承采用脂润滑,但是润滑脂具有非牛顿体特性和润滑过程的时效性,较难准确地建模分析其润滑特性。通过总结脂润滑弹流的理论分析与实验研究进展,基于Ostwald本构模型建模,用Gauss-Seidel迭代法和Jacobi双极子迭代法分析脂润滑条件下的润滑膜厚度分布和压力分布;探讨不同流变指数、不同载荷和不同卷吸速度对脂润滑弹流特性的影响。结果表明:载荷和卷吸速度对润滑脂膜厚和压力的影响与油润滑相似;稳定后的脂润滑膜厚接近相应工况基础油润滑膜厚的1/2;润滑脂的非牛顿特性越显著,则膜厚越小,压力分布越接近Hertz接触应力分布。Most of the rolling bearings used in engineering practice are lubricated with greases, and the greases exhibit non-Newtonian rheological behavior and the corresponding lubrication process has time effects.Therefore, the accurate analysis of grease lubrication is difficult.The development of the elastohydrodynamic lubrication of greases was summarized with respect to theoretical study and experimental investigation, based on the Ostwald constitutive model, the pressure distribution and film thickness distribution of elastohydrodynamics lubrication with grease were analyzed with the Gauss-Seidel iterative method and Jacobi dipole iterative method. The effects of rheological index, load and entrainment velocity on the properties of grease lubrication were examined.The results demonstrate that the influences of load and entrainment speed on grease film thickness and pressure distribution are similar to that of oil lubrication, and the stable grease lubrication film thickness is close to half of that of base oil under corresponding conditions.The more significant the non-Newtonian characteristic of the greases is ,the smaller the film thickness is and the closer the pressure distribution is to the Hertz contact pressure distribution.

关 键 词：脂润滑 非牛顿体效应 载荷 卷吸速度 

分 类 号：TH117.2[机械工程—机械设计及理论]