Ball Bearing Lubrication (The Elastohydrodynamics of Elliptical Contacts)

Hamrock, B. J.; Dowson, D.; Tallian, T. E.

doi:10.1115/1.3253193

Cited by 284 publications

(351 citation statements)

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“…For this purpose, the equations established by Hamrock and Dowson [23] were assumed. Therefore, the dimensions of contact (assumed elliptical) are given by Eq.…”

Section: Discussionmentioning

confidence: 99%

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Electrochemical Simulation of the Current and Potential Response in Sliding Tribocorrosion

Papageorgiou

Mischler

2012

Tribol Lett

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Valuable insights into the wear-corrosion behavior of metals, as well as into the tribocorrosion field through the development of simulation models of tribocorrosion experiments, can contribute in rationalizing wearaccelerated experiments and their open circuit potential (OCP) behavior under rubbing. These results demonstrate that mathematical models of controlled tribo-electrochemical contacts can complement the physical experiment and add valuable understanding to the tribological behavior of metals, alloys, and generally to materials in an electrochemically active environment. The excellent agreement of experimental wear data and the experimental OCP curves with the OCP simulations with time establishes the concepts underlying the galvanic coupling model as a valid methodological approach toward a quantitative description and mechanistic understanding of the tribo-electrochemical experiment. Besides analyzing stellite tribocorrosion, application of the model to Al alloy data has helped us quantify the relative contributions of chemical and mechanical wear and reveal the underlying synergy. Ti metal tribocorrosion under variable load has revealed that the contact pressure P av , can reach much lower values within the experimental time domain and finally be the cause of interruption of the initial wear mechanism.

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“…For this purpose, the equations established by Hamrock and Dowson [23] were assumed. Therefore, the dimensions of contact (assumed elliptical) are given by Eq.…”

Section: Discussionmentioning

confidence: 99%

“…From the Hamrock-Dowson approximation [23] for the contact parameter calculation of a convex on a concave body, we find that (see Appendix)…”

Section: Tribocorrosion Of Al Alloys In 005 M Naclmentioning

confidence: 99%

Electrochemical Simulation of the Current and Potential Response in Sliding Tribocorrosion

Papageorgiou

Mischler

2012

Tribol Lett

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“…12. The centre film thickness was determined using the Hamrock and Dowson [7] equation for elliptical contacts, i.e. indicates that the operating specific film thickness is strongly dependant on the viscosity of the bleed oil at the operating temperature.…”

Section: Discussionmentioning

confidence: 99%

“…It is composed by: a shaft adaptor (6), which connects the machine input shaft to the upper race (5); a support (2) and the lower race (3), both clamped to the bearing house (1); a torque cell (11) protected by two plates (9, 13), which connect the bearing house (1) to the lower support of the Four-Ball Machine through the pins (10,12). The retainer (7) and the cover (8) avoid the lubricant leakage. In operation, the bearing torque is transmitted to the torque cell through the bearing house.…”

Section: Methodsmentioning

confidence: 99%

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Influence of grease rheology on thrust ball bearings friction torque

Cousseau

Graça

Campos

et al. 2012

Tribology International

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a b s t r a c tThe friction torque and the operating temperatures in a thrust ball bearing were measured for seven different types of greases, including three biodegradable greases having low toxicity. These friction torque tests were performed using a modified Four-Ball machine.Rheological evaluations of the lubricating greases were made using a rheometer. Bleed oils were extracted from the greases and the dynamic viscosities were measured.In order to compare the performance of the lubricant greases in terms of friction, the grease characteristics were related to experimental results, showing that the interaction between thickener and base oil have strong influences in the bearing friction torque.

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Fluid Film Lubrication

Bhushan¹

2013

Introduction to Tribology

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Ball Bearing Lubrication (The Elastohydrodynamics of Elliptical Contacts)

Cited by 284 publications

References 0 publications

Electrochemical Simulation of the Current and Potential Response in Sliding Tribocorrosion

Electrochemical Simulation of the Current and Potential Response in Sliding Tribocorrosion

Influence of grease rheology on thrust ball bearings friction torque

Fluid Film Lubrication

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