湿式铜基摩擦副局部接触对摩擦因数的影响  

The Influence of Local Contact of Cu-Based Friction Pairs on Friction Coefficient

作　　者：李明阳[1] 马彪[1,2] 李和言 赵二辉[1] 杜秋 李慧珠[1] LI Ming-yang;MA Biao;LI He-yan;ZHAO Er-hui;DU Qiu;LI Hui-zhu(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Collaborative Innovation Center of Electric Vehicles in Beijing,Beijing 100081,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]北京电动车辆协同创新中心,北京100081

出　　处：《北京理工大学学报》2019年第1期53-57,共5页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(51575042);国家部委创新科研项目(VTDP-3203)

摘　　要：考虑金属的热衰退特性及温度、压力和摩滑速度对混合润滑油膜的影响,建立了湿式铜基摩擦副局部接触摩擦因数计算模型,研究了摩滑过程中湿式铜基摩擦副局部接触状态下摩擦因数的变化规律,并通过销-盘摩擦因数测量实验对摩擦因数计算模型进行了验证.研究结果表明:摩擦元件屈曲变形导致摩擦元件间摩擦状态发生变化,在局部接触条件下,接触区摩擦状态随温度升高可分为油膜主导阶段、微凸峰主导阶段、摩擦因数上升阶段和热衰退阶段4个阶段.其中,油膜主导阶段会随摩滑速度的减小而消失.干摩擦状态下,摩滑速度对摩擦因数影响较小.在混合润滑状态下,摩擦因数随摩滑速度增加而下降,且温度越小摩擦因数衰减越显著.局部接触区平均面压较小时,压力对摩擦因数影响较小,当压力超过100 MPa时,接触面压力开始对混合润滑中的油膜主导阶段产生影响,此时摩擦因数随压力升高而增大.A friction coefficient calculation model was established for heavy pressure local contact of wet Cu-based friction pairs to study the influence of heat fade,temperature,sliding speed and contact pressure on the mixture lubrication oil film and the change rule of friction coefficient.The model was validated by the friction coefficient measuring experiments of pin-plate.The results show that,under the condition of local high pressure the variation of friction coefficient with temperature can be divided into four stages,oil film leading stage of mixed lubrication,asperity domination stage of mixed lubrication,dry friction stage and heat fade stage.Furthermore,the oil film leading stage will be vanished when the sliding speed is low.Under the dry friction condition,sliding speed has little influence on friction coefficient.However,under the mixed lubrication condition,the friction coefficient decreases with the increase of sliding velocity.When the local pressure is not very heavy,the influence on friction coefficient is very little.While the local contact pressure exceeds 100 MPa,pressure begins to affect the friction coefficient.

关 键 词：湿式离合器 铜基摩擦副 局部接触 边界润滑 摩擦因数 油膜相对亏量 

分 类 号：U463.2[机械工程—车辆工程]