Detail publikace
Influence of Free Water Droplets on Film Formation Under Point Contact Grease Lubrication
HAN, Y. ŠPERKA, P. WANG, J. KŘUPKA, I. HARTL, M. LI, W. WANG, X. WEI-MIN, L.
Anglický název
Influence of Free Water Droplets on Film Formation Under Point Contact Grease Lubrication
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
en
Originální abstrakt
The influence of the grease-water two-phase emulsion on the bearing tracks 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 causes a brief rise in the grease film under steady-state conditions, specifically due to the grease-water phase connecting the oil reservoirs on both sides. 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 cause water pollution to the point of contact lubrication during the transformation from reciprocating motion to fretting.
Anglický abstrakt
The influence of the grease-water two-phase emulsion on the bearing tracks 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 causes a brief rise in the grease film under steady-state conditions, specifically due to the grease-water phase connecting the oil reservoirs on both sides. 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 cause water pollution to the point of contact lubrication during the transformation from reciprocating motion to fretting.
Klíčová slova anglicky
bearings;elastohydrodynamic lubrication;films;grease lubrication;lubricants;rolling
Vydáno
01.07.2023
Nakladatel
ASME
Místo
NEW YORK
ISSN
0742-4787
Ročník
145
Číslo
7
Strany od–do
074101-1–074101-17
Počet stran
17
BIBTEX
@article{BUT187554,
author="Yiming {Han} and Matthias {Thiex} and Petr {Šperka} and Jing {Wang} and Ivan {Křupka} and Martin {Hartl} and Weimin {Li} and Xiaobo {Wang} and Liu {Wei-Min},
title="Influence of Free Water Droplets on Film Formation Under Point Contact Grease Lubrication",
year="2023",
volume="145",
number="7",
month="July",
pages="074101-1--074101-17",
publisher="ASME",
address="NEW YORK",
issn="0742-4787"
}