Pressure fluctuations as grease soaps pass through an EHL contact

Larsson, Per‐Olof; Larsson, Roland; Jolkin, Alexei; Marklund, Olov

doi:10.1016/s0301-679x(00)00033-5

Cited by 21 publications

(14 citation statements)

References 11 publications

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“…It was already observed that both oil released from the grease and thickener lumps cross the EHD contact and contribute to EHD film formation at low speeds [1][2][3]. Many studies also suggest that lubricating greases with the same formulation generate higher film thickness for higher base oil viscosities and thickener content [4].…”

Section: Introductionmentioning

confidence: 99%

On the film thickness behaviour of polymer greases at low and high speeds

Gonçalves

Graça

Campos

et al. 2015

Tribology International

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Section: Introductionmentioning

confidence: 99%

On the film thickness behaviour of polymer greases at low and high speeds

Gonçalves

Graça

Campos

et al. 2015

Tribology International

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“…In what concerns the lubricant film formation, it was already observed that both the oil released from the grease and the thickener lumps cross the EHD contact, contributing to increasing the film thickness [1][2][3]. It was also found that the higher the base oil viscosity and/or thickener content, the higher is the film thickness [4].…”

Section: Introductionmentioning

confidence: 99%

Film Thickness and Friction Relationship in Grease Lubricated Rough Contacts

et al. 2017

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Abstract:The relationship between the film generation and the coefficient of friction in grease lubricated contacts was investigated. Ball-on-disc tests were performed under different operating conditions: entrainment speed, lubricant temperature and surface roughness. The tests were performed with fully formulated greases and their base oils. The greases were formulated with different thickener types and also different base oils natures and viscosities. Film thickness measurements were performed in ball-on-glass disc tests, and Stribeck curves were measured in ball-on-steel disc tests with discs of different roughness. The role of the thickener and the base oil nature/viscosity on the film thickness and coefficient of friction was addressed and the greases' performance was compared based on their formulation.

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“…A significant body of experimental and theoretical work has so far been conducted on understanding the underlying mechanisms and exploring the relevant applications of grease lubrication [1][2][3][4]. The results of such studies have led to many different views on grease lubricant [5][6][7][8][9][10][11][12][13][14]. Cann and colleagues [5,6] investigated grease lubrication under fully flooded and lubricant-starved conditions under a rolling contact using a ball-on-plate optical interferometry.…”

Section: Introductionmentioning

confidence: 99%

“…In subsequent studies, [7][8][9] they used infrared reflection spectroscopy and determined that the grease aged as thin films on metal surfaces and degraded in a bearing simulation device . Larsson et al [10] traced individual grease thickener particles (lumps) as they passed through the elastohydrodynamics lubrication contact using a ballon-plate optical interferometry under pure rolling motion. Miettinen et al clarified how contaminants in the grease [11] and running parts [12] influence the acoustic emission (AE) of the rolling bearing based on measurements of the AE.…”

Section: Introductionmentioning

confidence: 99%

Microbubble Phenomenon in the Grease Lubricating Film Induced by Micro-Oscillation

Liu

Guo

2013

Tribol Lett

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A microbubble phenomenon induced by microoscillation in the grease lubricating film confined within a nanogap between a highly polished steel ball and a smooth glass disc has been observed with an interferometer. Experimental results show that when the micro-oscillation frequency is a constant value, the microbubble number increases with the micro-oscillation amplitude. When the micro-oscillation amplitude is a constant value, the microbubble number increases with the micro-oscillation frequency when the latter is lower than the critical value and decreases with the micro-oscillation frequency when it is higher than the critical value. Theoretical models and analyses have been used to discuss the bubble formation and describe the characteristics of bubble movement.

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Pressure fluctuations as grease soaps pass through an EHL contact

Cited by 21 publications

References 11 publications

On the film thickness behaviour of polymer greases at low and high speeds

On the film thickness behaviour of polymer greases at low and high speeds

Film Thickness and Friction Relationship in Grease Lubricated Rough Contacts

Microbubble Phenomenon in the Grease Lubricating Film Induced by Micro-Oscillation

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