Comparative overview of five gear oils in mixed and boundary film lubrication

Brandão, José A.; Meheux, M.; Ville, Fabrice; Seabra, Jorge; Castro, J.

doi:10.1016/j.triboint.2011.10.007

Cited by 57 publications

(39 citation statements)

References 20 publications

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“…Comparing the different grease formulations, it is clear that synthetic base oils of lower viscosity promote low friction greases, as observed before in other works related to oil and grease lubrication [9,10,21,22,31]. Of course that, a lower viscosity base oil will also generate a lower film thickness for the same operating conditions which might not be desirable.…”

Section: Discussionsupporting

confidence: 61%

“…The traction behaviour of lubricating oils is well documented [19][20][21][22]. It is known that the traction coefficient depends on the low shear viscosity, the limiting shear modulus and the limiting shear stress that the lubricant can withstand [19,21].…”

Section: Introductionmentioning

confidence: 99%

“…It is known that the traction coefficient depends on the low shear viscosity, the limiting shear modulus and the limiting shear stress that the lubricant can withstand [19,21]. In the case of grease lubrication, its friction behaviour is poorly studied and frequently attributed to the base oil.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

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Film Thickness and Friction Relationship in Grease Lubricated Rough Contacts

et al. 2017

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“…The variation of viscosity with pressure and temperature is presumed to follow Roelands' equation [23]: [24] and are included in Table 2.…”

Section: Methodsmentioning

confidence: 99%

Measurement of mean wear coefficient during gear tests under various operating conditions

Brandão

Cerqueira

Seabra

et al. 2016

Tribology International

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a b s t r a c tSeven wear tests were conducted on an FZG gear testing machine in order to ascertain the influence of basestock (PAO and mineral), specific film thickness and contact load on the wear of spur gears, particularly on the wear coefficient κ that is used in Archard's law. The results showed that load may have some influence on the wear coefficient. They also showed that the influence of specific film thickness on wear is very non-linear. The influence of basestock, even with oils of similar viscosity, is very significant, as much as any other parameter in isolation.

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“…The properties of the oil used in the test were obtained from previous measurements, already published by Branda˜o et al, 24,25 where the oil is marked as 'E2'.…”

Section: Numerical Simulation Preamblementioning

confidence: 99%

Surface damage prediction during an FZG gear micropitting test

Brandão

Martins

Seabra

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part J:

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A numerical simulation of an actual FZG spur gear micropitting test was performed. The simulation was based on a model that takes into account: overpressure effects due to mixed or boundary film lubrication, in turn caused by the interaction of roughness features of the contacting gear teeth, represented in the simulation by actual roughness profiles measured on the teeth; residual stresses in the gear teeth; a high-cycle, multi-axial fatigue criterion to evaluate the fatigue damage on the surface. The simulation was applied to the four load stages that constitute an FZG gear micropitting test and actual gear meshing was simulated. It was additionally possible to ascertain the adequacy of the model to shorter load durations because the load stages of the original micropitting test had been periodically interrupted for intermediate monitoring.

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Comparative overview of five gear oils in mixed and boundary film lubrication

Cited by 57 publications

References 20 publications

Film Thickness and Friction Relationship in Grease Lubricated Rough Contacts

Film Thickness and Friction Relationship in Grease Lubricated Rough Contacts

Measurement of mean wear coefficient during gear tests under various operating conditions

Surface damage prediction during an FZG gear micropitting test

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