Effect of Over Rolling Frequency on the Film Formation in Grease Lubricated EHD Contacts under Starved Conditions

Fischer, Dennis; Mues, Helko; Jacobs, Georg; Stratmann, Andreas

doi:10.3390/lubricants7020019

Cited by 14 publications

(10 citation statements)

References 40 publications

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“…Fischer et al [22,23] point out that the base oil type of a grease can strongly affect film formation in elastohydrodynamically lubricated contacts. The presence of a thickener layer can separate the contacting surfaces under starved lubrication.…”

Section: Grease Lubrication In Gearboxesmentioning

confidence: 99%

WITHDRAWN: Numerical Visualization of Grease Flow in a Gearbox

Liu¹,

Dangl²,

Lohner³

et al. 2020

Preprint

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Gearbox lubrication plays a decisive role in both load capacity and efficiency. It is necessary for the formation of a lubricant film in tribological contacts, and for heat dissipation. Grease lubrication is often applied to gearboxes at a low operating speed and means that, for example, less effort is required in sealing design compared to oil lubrication. Over the years, the computational fluid dynamics (CFD) method has frequently been applied to support the lubrication-related design of gearboxes. However, very few studies have focused on grease lubrication. Whereas oil can generally be considered as Newtonian fluid, grease displays complex non-Newtonian flow behavior. In this study, the grease lubrication of a single-stage test gearbox is investigated by means of a finite-volume based CFD model. The numerical results on the grease flow show good accordance with high-speed camera recordings, and clearly display the lubrication mechanisms of “channeling” and “circulating”. These first results on grease flow simulation in gearboxes offer a starting point for further numerical studies.

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Section: Grease Lubrication In Gearboxesmentioning

confidence: 99%

WITHDRAWN: Numerical Visualization of Grease Flow in a Gearbox

Liu¹,

Dangl²,

Lohner³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Combined with limited phase separation capability, it leads to a poor grease supply of the gear mesh. Fischer et al [26,27] point out that the base oil type of a grease can strongly affect lubricant film formation in EHL contacts. The presence of a thickener layer can separate the contacting surfaces under starved lubrication.…”

Section: Grease Lubrication In Gearboxesmentioning

confidence: 99%

Numerical Visualization of Grease Flow in a Gearbox

Liu

Dangl

Lohner

et al. 2023

Chin. J. Mech. Eng.

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Lubricating greases are widely used in e.g. open gear drives and gearboxes with difficult sealing conditions. The efficiency and heat balance of grease-lubricated gearboxes depend strongly on the lubrication mechanisms channeling and circulating, for which the grease flow is causal. The computational fluid dynamics opens up the possibility to visualize and understand the grease flow in gearboxes in more detail. In this study, a single-stage gearbox lubricated with an NLGI 1-2 grease was modeled by the finite-volume method to numerically investigate the fluid flow. Results show that the rotating gears influence the grease sump only locally around the gears. For a low grease fill volume, the rotation of the gears is widely separated from the grease sump. For a high grease fill volume, a pronounced gear-grease interaction results in a circulating grease flow around the gears. The simulated grease distributions show good accordance with high-speed camera recordings.

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“…Additionally, lubricant is used to reduce the risk of corrosion and wear [46]. To increase the bearing lifetime, a fully flooded bearing and the corresponding base oil viscosity should be considered [47].…”

Section: Bearing Faultsmentioning

confidence: 99%

Methods of Condition Monitoring and Fault Detection for Electrical Machines

et al. 2021

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Nowadays, electrical machines and drive systems are playing an essential role in different applications. Eventually, various failures occur in long-term continuous operation. Due to the increased influence of such devices on industry, industrial branches, as well as ordinary human life, condition monitoring and timely fault diagnostics have gained a reasonable importance. In this review article, there are studied different diagnostic techniques that can be used for algorithms’ training and realization of predictive maintenance. Benefits and drawbacks of intelligent diagnostic techniques are highlighted. The most widespread faults of electrical machines are discussed as well as techniques for parameters’ monitoring are introduced.

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Effect of Over Rolling Frequency on the Film Formation in Grease Lubricated EHD Contacts under Starved Conditions

Cited by 14 publications

References 40 publications

WITHDRAWN: Numerical Visualization of Grease Flow in a Gearbox

WITHDRAWN: Numerical Visualization of Grease Flow in a Gearbox

Numerical Visualization of Grease Flow in a Gearbox

Methods of Condition Monitoring and Fault Detection for Electrical Machines

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