Influence of free water droplets on film formation under point contact grease lubrication

IF 2.2 3区工程技术 Q2 ENGINEERING, MECHANICAL

Journal of Tribology-transactions of The Asme Pub Date : 2023-02-20 DOI:10.1115/1.4056944

Yiming Han, P. Sperka, Jing Wang, I. Křupka, M. Hartl, Weimin Li, X. B. Wang, Weimin Liu

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引用次数: 0

Abstract

The influence of the grease-water two-phase emulsion on the bearing track on the film formation has been studied by carrying out optical interferometry experiments on a ball disk test rig to observe the dynamic film-forming behavior of lubricating grease under steady-state and micro-oscillation conditions. It is found that free water cause a brief rise in the grease film under steady-state conditions, specifically due to the grease-water phase connecting the oil band on both sides of the oil reservoir. The experiment determines that the state of the phase before entering the elastohydrodynamic lubrication (EHL) contact is water-in-oil. For the reciprocating motion and oscillation, the effects of the amount of free water and the length of the motion stroke are discussed in detail. It is found that for reciprocating movements with long stroke lengths, the effect of free water is summarized to enhance the fluidity of the fibrous mass of the grease thickener in the first few cycles of the movement. For shorter stroke lengths, the effect of free water is a scouring effect on the contact zone grease after 100 cycles. This paper provides new insights into the effects that causes water pollution to the point contact lubrication during the transformation from reciprocating motion to fretting.

查看原文本刊更多论文

点接触油脂润滑下自由水滴对成膜的影响

通过在球盘试验台上进行光学干涉测量实验，研究了轴承轨道上的脂水两相乳化液对成膜的影响，观察了润滑脂在稳态和微振荡条件下的动态成膜行为。研究发现，在稳态条件下，自由水会引起油膜的短暂上升，特别是由于油带两侧连接的油-水相。实验确定了进入弹性流体动力润滑(EHL)接触前的相状态为油包水。对于往复运动和振荡，详细讨论了自由水量和运动行程长度的影响。研究发现，对于长行程的往复运动，总结了自由水的作用，在运动的前几个循环中提高了油脂增稠剂纤维团块的流动性。对于较短的行程长度，自由水的作用是在100次循环后对接触区润滑脂的冲刷作用。本文对由往复运动向微动转变过程中水污染对点接触润滑的影响有了新的认识。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Tribology-transactions of The Asme 工程技术-工程：机械

CiteScore

4.20

自引率

12.00%

发文量

117

审稿时长

4.1 months

期刊介绍： The Journal of Tribology publishes over 100 outstanding technical articles of permanent interest to the tribology community annually and attracts articles by tribologists from around the world. The journal features a mix of experimental, numerical, and theoretical articles dealing with all aspects of the field. In addition to being of interest to engineers and other scientists doing research in the field, the Journal is also of great importance to engineers who design or use mechanical components such as bearings, gears, seals, magnetic recording heads and disks, or prosthetic joints, or who are involved with manufacturing processes. Scope: Friction and wear; Fluid film lubrication; Elastohydrodynamic lubrication; Surface properties and characterization; Contact mechanics; Magnetic recordings; Tribological systems; Seals; Bearing design and technology; Gears; Metalworking; Lubricants; Artificial joints