Study on starved HEL for developing lubrication method of rolling bearing with minute amount of lubricant

饥饿HEL开发滚动轴承微量润滑剂润滑方法的研究

• 批准号: 14550122
• 负责人: ITOIGAWA Fumihiro
• 金额: $ 2.05万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550122/
• 关键词: EHL; starved condition; meniscus length; Film thickness; Innterferometry; sequentially ball passing; ball bearing; side band; 油不足; 回帰式; メニスカス; 再流入; 微量油潤滑; スタベーションファクター; 光学干渉計測

Regression formulae which give central film thickness, minimum film thickness and both inlet meniscus and side meniscus lengths as a function of inlet film thickness are derived by a numerical analysis incorporating Elrod algorithm, respectively. A ratio of the minimum film thickness to central film thickness becomes uniform value as starvation state proceeds.A measurement apparatus for starved film thickness with interferometry has been developed to verify the derived formulae and to investigate effect of sequential ball passing on the starved EHL film thickness, which appears in practical ball bearings. That effect is investigated by measuring the reduction of the each starved EHL film thickness of the three sequentially arranged balls in the same circumferencial track on a glass disk with interferometry. Initial inlet film thickness with uniform distribution is generated by a roller which is placed in front of the first ball. This lubricant film on the glass disk passes through the conjunction between ball and disk and, then, partially re-flows an same inlet of the ball by adhering its ball surface. Therefore, central film thickness is controlled with sum of the film thickness on the glass disk and half of the film thickness on the ball surface flowing in its inlet. Central film thickness by solving simultaneously this relationship, the derived formulae and Hamrock-Dowson formula for central film thickness agrees with interferometry measurement result with errors less than 10%. In addition, the predicted reduction in film thickness by sequentially passing also agrees with measurement result.Influence of side band of lubricant on the meniscus length appears if the inlet film thickness is approximately equal to central film thickness in a fully flooded condition. In this case, the side meniscus length becomes to considerably differ from calculating result. However, this difference has merely influence on the central film thickness.

通过结合 Elrod 算法的数值分析，分别导出了回归公式，该回归公式给出了中心膜厚度、最小膜厚度以及入口弯月面和侧弯月面长度作为入口膜厚度的函数。随着饥饿状态的进行，最小膜厚度与中心膜厚度的比率变得均匀。开发了一种利用干涉法测量饥饿膜厚度的装置，以验证推导的公式并研究连续滚珠通过对实际球轴承中出现的饥饿EHL膜厚度的影响。通过使用干涉测量法测量玻璃盘上同一圆周轨道上的三个顺序排列的球的每个饥饿 EHL 膜厚度的减少来研究该效应。分布均匀的初始入口膜厚度由放置在第一个球前面的滚轮产生。玻璃盘上的润滑膜穿过球与盘之间的接合处，然后通过粘附其球表面而部分回流到球的同一入口。因此，中心膜厚由玻璃盘上的膜厚和在其入口处流动的球表面上的膜厚的一半之和来控制。通过同时求解该关系式得到中心膜厚，推导出的中心膜厚公式及Hamrock-Dowson公式与干涉测量结果一致，误差小于10%。此外，预测的依次通过的油膜厚度减少也与测量结果一致。如果在完全淹没条件下入口油膜厚度约等于中心油膜厚度，则润滑剂的边带对弯液面长度的影响就会出现。在这种情况下，侧弯液面长度变得与计算结果显着不同。然而，这种差异仅影响中心膜厚度。