表面波纹度对偏心轮-平面挺杆接触润滑性能的影响  

Influence of Harmonic Waviness on the Elastohydrodynamic Lubrication of an Eccentric-Tappet Pair

作　　者：王静[1] 王娜[1] 吉志宽[1] 

机构地区：[1]青岛理工大学机械工程学院,山东青岛266033

出　　处：《摩擦学学报》2013年第3期289-297,共9页Tribology

基　　金：国家自然科学基金项目(51075221);国家重点基础研究发展规划项目(973)(2011CB706602)资助~~

摘　　要：本文采用数值分析方法研究了偏心轮-挺杆副的微热弹性流体动力润滑问题.分析中假设平面挺杆表面分布有余弦波纹,探讨了偏心距和余弦波波长对润滑油膜变化的影响.数值模拟计算结果表明:在偏心轮-挺杆副工作的一个周期里,表面波纹度的存在会导致油膜压力和温度上升.在不同的滑滚比条件下,表面波纹的弹性变形程度不同.在两表面反向运动的半个周期内,随偏心距的增加,滑滚比也增加,导致表面波纹的变形程度降低.在两表面反向运动的半个周期内,波纹的弹性变形程度受"温度-黏度楔"机理的控制.The micro - thermal elastohydrodynamic lubrication of an eccentric - tappet pair was investigated by assuming a harmonic waviness on the flat - tappet surface. The effects of wavelength and eccentricity of the eccentric were explored. The calculation results show that the surface waviness can cause fluctuations in pressure, film thickness and temperature profiles. The amplitude deformation of the surface waviness varied with the slide - roll ratio. During the half period with opposite motion, the slide - roll ratio increased with the eccentricities, causing the reduction in the amplitude deformation. The elastic deformation of the waviness in opposite motion was controlled by the ＂temperature - viscosity wedge＂ effect.

关 键 词：偏心轮 平面挺杆 表面形貌 热弹流润滑 

分 类 号：TH117.22[机械工程—机械设计及理论]