基于质量守恒边界条件的浮环轴承贫油润滑特性理论分析  

A Theoretical Investigation on Starved Lubricating Characteristics of the Floating Ring Bearing Based on Jakobsson-Floberg-Olsson Boundary Condition

作　　者：张浩[1] 师占群[1,2] 张顺心[1,2] 姚莉楠 宋中越[1] 

机构地区：[1]河北工业大学机械工程学院,天津300130 [2]上海交通大学机械系统与振动国家重点实验室,上海200240

出　　处：《机械工程学报》2014年第9期100-107,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51275150);河北省留学回国人员(2012003025);机械系统与振动国家重点实验室开放基金(MSV-2011-22)资助项目

摘　　要：对浮环轴承贫油润滑机理进行了理论分析。在Elrod算法的基础上,采用有限差分法求解基于质量守恒边界条件(Jakobsson-Floberg-Olsson,JFO)的表征内外油膜压力分布的Reynolds方程,推导内外油膜承载力、流量和注入内油膜的压差注油量的表达式,建立贫油润滑状态下的内油膜压力分布模型。利用Matlab对浮环轴承润滑机理进行了仿真计算,分析静载荷和供油压力对浮动环与轴颈的静平衡位置、内外油膜端泄量与压差注油量的影响,进而讨论贫油润滑状态下轴颈的静平衡位置。结果表明较大的静载荷会产生较大的浮动环偏心率和轴颈偏心率以及内外油膜端泄量,但是压差注油量则会减小。在贫油润滑状态下,内油膜在收敛间隙中发生破裂,承载能力下降,提高供油压力可以明显地增大压差注油量,有效地避免内油膜贫油现象的出现。A theoretical investigation is carried out for the mechanism of starved lubrication of the floating ring bearing.According to Elrod algorithm,the finite difference method is adopted to solve Reynolds equation for obtaining both inner and outer oil film pressure distribution based on the Jakobsson-Floberg-Olsson（JFO） boundary condition.The analytical expression of the hydrodynamic force,flow rate and pressure-difference flow rate are derived.A model of the inner oil film pressure distribution is developed under starved lubrication.The lubrication model is then simulated by using Matlab software.The effects of load and lubricant feed pressure on the static equilibrium position of both ring and journal,side leakage of both inner and outer oil films and pressure-difference inlet flow rate are analysed.Furthermore,the static equilibrium position of the journal is discussed under starved lubrication.It is indicated that a heavy external load can lead to the large eccentricity of both ring and jourual as well as the large side leakage of both inner and outer oil films,but the pressure-difference inlet flow rate will be decreased.The starved lubrication can not only lead to a rupture in the convergence gap of the inner oil film,but also decrease its load capability.Increasing lubricant feed pressure can obviously improve the pressure-difference inlet flow rate and also effectively avoid the occurrence of starved lubrication in the inner oil film.

关 键 词：浮环轴承 JFO边界条件 静平衡位置 端泄量 压差注油量 贫油润滑 

分 类 号：TH117[机械工程—机械设计及理论]