Thickener Behaviour in Rolling Elastohydrodynamic Lubrication Contacts

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Michal Okal, David Kostal, Kazumi Sakai, Ivan Krupka, Martin Hartl
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Abstract

This paper focuses on the study of thickener behaviour in elastohydrodynamic contacts using fluorescence microscopy and optical interferometry. A standard Ball-on-disc configuration tribometer was used as well as a newly developed Ball-on-ring configuration tribometer mimicking the conditions in a 6314 deep groove ball bearing. Three types of custom-made greases were used with the same base oil and Coumarin 6 fluorescent dye on the thickener. These greases contained no additives and were of the lithium complex and alicyclic di-urea type. It was confirmed that the behaviour of the grease was directly influenced by both the structure and type of thickener, and the differences were successfully observed by fluorescence microscopy. The concentration of thickener was found to change due to the formation or breakdown of the deposited thickener layer on the track. At low speeds, the alicyclic di-urea forms a thickener layer on the track that is more pronounced than the lubricating film formed by the base oil alone. The thickener layer formation also occurs at higher speeds when fully flooded conditions are beneficial in building the layer. Experiments with a Ball-on-ring tribometer show that the natural replenishment of the real contact geometry is more effective than on a Ball-on-disc tribometer, but the formation of the thickener layer on the track is more limited than in a Ball-on-disc tribometer with artificial replenishment. At higher velocities, a smaller but stable layer is formed where the layer does not change much from a certain velocity.

Abstract Image

增稠剂在滚动弹性流体动力润滑接触中的行为
本文主要利用荧光显微镜和光学干涉测量法研究增稠剂在弹性流体动力接触中的行为。使用了标准的球对盘配置摩擦仪以及新开发的球对环配置摩擦仪,模拟 6314 深沟球轴承中的条件。使用了三种定制润滑脂,基础油和稠化剂上的香豆素 6 荧光染料相同。这些润滑脂不含任何添加剂,属于锂络合物和脂环二脲类型。结果证实,润滑脂的性能直接受到稠化剂的结构和类型的影响,并成功地通过荧光显微镜观察到了差异。研究发现,增稠剂的浓度会随着轨道上增稠剂沉积层的形成或破坏而发生变化。在低速行驶时,脂环二脲在轨道上形成的增稠剂层比仅由基础油形成的润滑膜更为明显。在较高速度下,当完全充水的条件有利于形成增稠层时,增稠层也会形成。用滚珠-圆环摩擦磨损试验机进行的实验表明,实际接触几何形状的自然补充比滚珠-圆盘摩擦磨损试验机更有效,但与人工补充的滚珠-圆盘摩擦磨损试验机相比,在轨道上形成的增稠剂层更有限。在较高的速度下,会形成一个较小但稳定的层,该层在一定速度下变化不大。
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来源期刊
Tribology Letters
Tribology Letters 工程技术-工程:化工
CiteScore
5.30
自引率
9.40%
发文量
116
审稿时长
2.5 months
期刊介绍: Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.
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