接触表面性质对圆柱滚子轴承混合润滑的影响  

Effect of Contact Surface Properties on Mixed Lubrication in Cylindrical Roller Bearings

作　　者：周江敏 刘晓玲 李栋 刘凤麒 ZHOU Jiang-min;LIU Xiao-ling;LI Dong;LIU Feng-qi(School of Mechanical&Automotive Engineering,Qingdao University of Technology,Qingdao 266520,China)

机构地区：[1]青岛理工大学机械与汽车工程学院

出　　处：《表面技术》2019年第12期174-181,共8页Surface Technology

基　　金：国家自然科学基金项目(51475250,51775286)~~

摘　　要：目的为了提高圆柱滚子轴承的润滑性能,研究滚子与外圈表面纹理及硬弹比对圆柱滚子轴承混合润滑的影响。方法基于平均流量模型、非牛顿效应、热效应和粗糙峰的弹塑性变形,建立了圆柱滚子轴承有限长线接触热混合润滑模型。研究了表面纹理及硬弹比对膜厚、膜厚比、载荷比、平均摩擦系数及最高温度的影响。结果随着表面纹理参数的增大,油膜厚度逐渐减小,粗糙峰接触压力、平均摩擦系数和载荷比逐渐增,最高温度先减小后增大,最小膜厚先增大后减小。但表面纹理参数小于1/3时,对最小膜厚的影响非常小。表面硬度引起的完全塑性变形、弹塑性和塑性变形、完全弹塑性变形对润滑状态的影响不同。在硬弹比处于0.01~0.03时,粗糙峰同时发生弹塑性和塑性变形,油膜厚度、最小膜厚、载荷比、平均摩擦系数、粗糙峰接触压力及最高温度不随表面硬度而变化。当硬弹比小于0.01时,粗糙峰产生完全塑性变形;当硬弹比大于0.03时,粗糙峰发生完全弹塑性变形。这两种情况的载荷比、平均摩擦系数、粗糙峰接触压力及最高温度均随着表面硬弹比的增大而增大。在不同工况下,表面硬度与表面纹理参数对圆柱滚子轴承润滑状态的影响存在差异。在表面纹理参数小于1/3时,表面硬度的影响占主导地位;在表面纹理参数大于1.0时,表面纹理参数的影响占据主导地位。结论表面纹理参数等于1.0时,润滑状态最好;硬弹比处于0.01~0.03时,综合润滑性能最好。在不同条件下,表面纹理参数与表面硬度对润滑影响的程度不同。因此,圆柱滚子轴承混合润滑中,存在最佳的表面纹理参数和表面硬弹比。The work aims to improve the lubrication performance of cylindrical roller bearings and study the effects of surface pattern and hardness to elastic modulus ratio of roller and outer ring on the mixed lubrication of cylindrical roller bearings.Based on the average flow model,non-Newtonian,thermal effect and elastic-plastic deformation of rough peak,a finite line contact thermal mixed lubrication model for cylindrical roller bearings was established.Effects of the surface pattern and hardness to elastic modulus ratio on the film thickness,the film thickness ratio,the load ratio,the average friction coefficient and the maximum temperature were studied.With the increase of the surface pattern parameter,the oil film thickness decreased gradually;the contact pressure,the average friction coefficient and the load ratio increased gradually;the maximum temperature decreased at first and then increased;and the minimum film thickness increased firstly and then decreased.However,when the surface pattern parameter was less than 1/3,the effect on the minimum film thickness was slight.Effects of the complete plastic deformation,the elastic-plastic and the plastic deformation,and the complete elastic-plastic deformation caused by the surface hardness on lubrication state were different.When the hardness to elastic modulus ratio was between 0.01 and 0.03,the elastic-plastic and the plastic deformation of the rough peak occurred simultaneously.The film thickness,the minimum film thickness,the load ratio,the average friction coefficient,the contact pressure and the maximum temperature did not change with the surface hardness.When the hardness to elastic modulus ratio was less than 0.01,the rough peak produced complete plastic deformation,and when the hardness to elastic modulus ratio was greater than 0.03,the rough peak underwent complete elastic-plastic deformation.The load ratio,the average friction coefficient,the contact pressure and the maximum temperature of the two cases all increased with the increase of surface hardness t

关 键 词：表面纹理 表面硬度 混合润滑 非牛顿流体 热效应 弹塑性变形 

分 类 号：TH133[机械工程—机械制造及自动化]