Experimental research on marine oil-lubricated stern tube bearing

Litwin, Wojciech

doi:10.1177/1350650119846004

Cited by 9 publications

(2 citation statements)

References 28 publications

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“…Numerical difficulties prevented predictions at eccentricity ratios greater than 1.2, and comparisons between theoretical and experimental pressure distributions were not presented. Litwin [2] measured pressures in a 100 mm diameter bearing of length 200 mm and diametral clearance of between 0.4 and 0.5 mm. The bearing was not a conventional one, with the lower half having no flutes, and the upper half being composed of four staves.…”

Section: Introductionmentioning

confidence: 99%

On the Design and Lubrication of Water-Lubricated, Rubber, Cutlass Bearings Operating in the Soft EHL Regime

Smith

2020

Lubricants

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All propeller-driven ships employ a drive shaft supported by journal bearings. To avoid water pollution, these bearings are generally lubricated by the surrounding water, removing the need for a rear seal. Such bearings, commonly referred to as Cutlass bearings, usually have an inner grooved nitrile rubber lining. The grooves (called flutes) allow debris to be flushed out and the bearing surface to be cooled. The remaining area is divided into a number of load-carrying areas called staves. At present, no rigorous design guide exists for these bearings. This paper presents a methodology to predict the minimum film thickness between the journal and the most heavily-loaded stave, an approach not hitherto reported in the literature. The method includes a new, 3D, finite element (FE) approach for soft elasto-hydrodynamic (EHL) predictive modelling of generated pressures in cutlass bearings. Model predictions compare favourably with experimental data. It is shown that the modulus of elasticity of the rubber has no influence on the minimum film thickness. An equation relating dimensionless film thickness to dimensionless load, clearance ratio and numbers of staves is presented. For a nominally circular bearing, increasing the clearance ratio or increasing the numbers of staves reduces load-carrying capacity. It is shown that distortion due to loading can increase load-carrying capacity.

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Section: Introductionmentioning

confidence: 99%

On the Design and Lubrication of Water-Lubricated, Rubber, Cutlass Bearings Operating in the Soft EHL Regime

Smith

2020

Lubricants

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“…В настоящее время применяются дейдвудные подшипники, смазываемые как маслом, так и водой [1]- [3]. Несмотря на ряд преимуществ дейдвудных подшипников, смазываемых маслом [2], по сравнению с дейдвудными подшипниками, работающими в воде, последние имеют более широкое применение. Это обусловлено постоянным ужесточением требований к охране водной среды -утечки масла через уплотнения дейдвудных устройств, смазываемых маслом, составляют в зависимости от водоизмещения судна 1000-5000 л в год [1], [4].…”

Section: введение (Introduction)unclassified

Friction Mechanism of Polyamide-6 Against Tin Bronze Under the Boundary Lubrication Conditions

Tsvetkov¹,

Shipping²,

Zhuravleva³

et al. 2020

Vestnik GUMRF imeni admirala S. O. Makarova

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The friction of polyamide-6 against tin bronze BrO5Tz5S5 is investigated. The experiments on a friction machine MI-1 according to the scheme of «a stationary ring against a rotating roller» arranged by both direct and reverse friction pair are carried out. The reverse pair is tested under both water lubrication and dry condition, whereas the direct pair is tested just under water lubrication. The lubrication is implemented by partially immersing the roller into the tray filled with fresh water. At first every friction pair underwent breakingin with the load equal to that taking place on the surface of real stern-tube bearings during their breaking-in. Then the friction moment is recorded at different loads. When dealing with dry friction, the breaking-in, however, is implemented under water lubrication condition mentioned above, then the roller and the ring are dried thoroughly with paper napkins and fixed again exactly on the previous position. It turned out that friction in polyamide-tin bronze pair under boundary lubrication with water does not depend on the initial roughness of both polyamide and bronze element. And the friction does not depend on the friction scheme (direct or reverse pair) either. Even at comparatively high pressure, characteristic for the real stern-tube bearings breaking-in, the water comes in between the rubbing surfaces. The friction under lubrication condition is caused completely by adhesion, which, in its turn, results from dispersion interaction between adsorbed water films (under water lubrication) or immediately rubbing surfaces (under dry condition). Application of water reduces the friction by 25 % compared to the dry friction.

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A novel ternary interpenetrating polymer networks based on NBR/PU/EP with outstanding damping and tribological properties for water-lubricated bearings

Wang

et al. 2022

Tribology International

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Experimental research on marine oil-lubricated stern tube bearing

Cited by 9 publications

References 28 publications

On the Design and Lubrication of Water-Lubricated, Rubber, Cutlass Bearings Operating in the Soft EHL Regime

On the Design and Lubrication of Water-Lubricated, Rubber, Cutlass Bearings Operating in the Soft EHL Regime

Friction Mechanism of Polyamide-6 Against Tin Bronze Under the Boundary Lubrication Conditions

A novel ternary interpenetrating polymer networks based on NBR/PU/EP with outstanding damping and tribological properties for water-lubricated bearings

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