An Analysis and Prediction of Lubricant Film Starvation in Rolling Contact Systems
An Analysis and Prediction of Lubricant Film Starvation in Rolling Contact Systems
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DOI：
10.1080/05698197408981435
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发表时间：
1974
影响因子：
2.1
通讯作者：
Y. Chiu
中科院分区：
文献类型：
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作者：
Y. Chiu
在球-平板实验台上进行的光学EHD实验表明，EHD液膜饥饿程度随滚动速度和粘度的增加而增加。滚动接触中的润滑膜饥饿归因于在接触之间的时间间隔内滚动路径中的流体补充不足。采用薄膜补充模型计算薄膜回弹率。表面张力在接触润滑中的作用是根据其对膜补充速率的影响来定义的。分析提出了使用一个凹陷的油层形状近似的变形赫兹点接触轮廓，以预测上游半膜高度的高原EHD膜的厚度上的效果。得到了平台油膜厚度与速度-粘度参数和与油-空气表面张力和滚动元件间距成比例的新的饥饿参数的关系图。计算结果与不同转速下圆接触平台油膜厚度的实测值吻合较好。
Optical EHD experiments in a ball-flat rig reveal that the degree of EHD fluid film starvation increases with both rolling speed and viscosity. Lubricant film starvation in rolling contacts is attributed to the insufficiency of fluid replenishment in the rolling path in the time interval between contacts. A film replenishment model is used to compute the film rebounding rate. The role of surface tension in contact lubrication is defined in terms of its effects on the rate of film replenishment. An analysis is presented using a depressed oil layer shape approximated by a deformed Hertzian point contact profile to predict the effect of upstream half-film height on the thickness of the plateau EHD film. A graph is obtained for the plateau film thickness as a function of the speed-viscosity parameter and a new starvation parameter proportional to oil-air surface tension and rolling element spacing. The result is in agreement with measured plateau film thickness in circular contact at different speeds for a re...