There is currently great interest in the use of textured bearings, where many tiny micropockets are incorporated in one of the bearing surfaces. Such texturing has been found to enhance load support and to reduce hydrodynamic friction in low load conditions, when the two surfaces have very low or zero convergence ratio, i.e. are essentially parallel. It is not immediately clear from hydrodynamic lubrication theory how a bearing with parallel surfaces and internal pockets can entrain any lubricant to form a hydrodynamic film and thus support load. However in a recent technical note the authors have shown that the occurrence of cavitation within micropockets results in suction of lubricant into the bearing, because the pressure inside the pockets is less than the surrounding, atmospheric pressure [1]. For parallel or very low convergence ratio bearings, this supply process replaces fluid entrainment as the main mechanism by which lubricant is drawn into the contact. In previous work this suction mechanism was demonstrated using a simple analytical approach for a 1D parallel bearing having a single pocket. The current paper extends this analytical method to convergent bearings having a single pocket and then applies a numerical solution of the first order Reynolds equation to solve for flow in multi-pocketed bearings. This enables the contribution of fluid suction on the load support of low convergence ratio bearings to be investigated.
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STLE/ASME 2006 International Joint Tribology Conference
October 23–25, 2006
San Antonio, Texas, USA
Conference Sponsors:
- Tribology Division
ISBN:
0-7918-4259-2
PROCEEDINGS PAPER
Two Mechanisms of Hydrodynamic Lubrication in Textured Bearings Available to Purchase
Mark T. Fowell,
Mark T. Fowell
Imperial College London, London, UK
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Andrew V. Olver,
Andrew V. Olver
Imperial College London, London, UK
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Ian G. Pegg,
Ian G. Pegg
Ford Motor Company, Dunton, Essex, UK
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Hugh A. Spikes
Hugh A. Spikes
Imperial College London, London, UK
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Mark T. Fowell
Imperial College London, London, UK
Andrew V. Olver
Imperial College London, London, UK
Ian G. Pegg
Ford Motor Company, Dunton, Essex, UK
Hugh A. Spikes
Imperial College London, London, UK
Paper No:
IJTC2006-12323, pp. 511-512; 2 pages
Published Online:
October 2, 2008
Citation
Fowell, MT, Olver, AV, Pegg, IG, & Spikes, HA. "Two Mechanisms of Hydrodynamic Lubrication in Textured Bearings." Proceedings of the STLE/ASME 2006 International Joint Tribology Conference. Part A: Tribomaterials; Lubricants and Additives; Elastohydrodynamic Lubrication; Hydrodynamic Lubrication and Fluid Film Bearings; Rolling Element Bearings; Engine Tribology; Machine Components Tribology; Contact Mechanics. San Antonio, Texas, USA. October 23–25, 2006. pp. 511-512. ASME. https://doi.org/10.1115/IJTC2006-12323
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