Porous metal bearings — A critical review

Kumar, Vinay

doi:10.1016/0043-1648(80)90055-1

Cited by 21 publications

(3 citation statements)

References 69 publications

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“…The effective porosity of porous metal bearings lies between 20 and 30% of the total weight of the bearing material -the upper limit being imposed by strength considerations that vary inversely with porosity. The main limitation of porous material bearings is that they commonly operate with only boundary or squeeze fi lm bearings; squeeze fi lm occurs when two lubricated surfaces approach each other at a normal velocity and the thin fi lm of lubricant between the two surfaces acts as a cushion preventing the surfaces from making instantaneous contact (Kumar, 1980). Hydrophilic moieties of the phospholipids coat the natural surface where they are free to interact with water molecules and ions.…”

mentioning

confidence: 99%

Importance of bearing porosity in engineering and natural lubrication

Pawlak¹,

Urbaniak

Kałdoński

et al. 2013

Biomaterials and Medical Tribology

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mentioning

confidence: 99%

Importance of bearing porosity in engineering and natural lubrication

Pawlak¹,

Urbaniak

Kałdoński

et al. 2013

Biomaterials and Medical Tribology

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“…For example, the HDL of a porous bearing using the Reynolds modified equation under a turbulent regime and with slip velocity was analyzed by Kumar, etc. [6]. Prakash and Tiwari [7] analyzed the impact of the bearing-journal interface on lubrication quality.…”

Section: Introduction and Lubrication Theory Backgroundmentioning

confidence: 99%

Analysis of Lubrication Regimes for Porous Sliding Bearing

Marinković,

Stojanović,

Gachot

et al. 2024

Lubricants

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The purpose of this paper is to analyze the lubrication quality of porous sliding bearings, starting from the bearing model and in combination with experimental results aimed at analyzing the lubrication regimes of different working conditions. The separation between the surfaces by the lubricant layer is what determines the regime. The quality and type of lubrication regime are determined by parameters in the mathematical model including typically speed, load, motion, materials, environment, etc., which have an impact on friction. Besides those elements, important parameters such as coefficient of friction (COF) and working temperature are to be measured due to experimental investigations to detect an equilibrium working state. The self-lubrication mechanism in porous metal bearings improves their service life and lubrication processes; however, the COF still varies within a wide interval. This variability can be understood, considering that during bearing operation it operates within a broad range of lubrication regimes. Those findings are explained in the paper by using a combination of calculated parameters according to the bearing model and in combination with our own results of experimental investigations. With the obtained results for particular working conditions, the authors are trying to explain, in the form of a diagram with the limit line as an important outcome of the work, that the lubrication regime for porous metal bearings could arise from boundary lubrication (BL) close to hydrodynamic lubrication (HDL).

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“…Temperature rises while axle rotates, then frictional interface is filled with oil, and the load is subjected by fluid-pressure. This bearing can reduce friction and diminish abrasion greatly, meanwhile it suits to a wide range of speeds, and vibration absorption is also its advantage, so oil-retaining bearing is widely applied in various fields [1][2][3] . While working, powered bearing will lose grease over the frictional surface.…”

mentioning

confidence: 99%

Simulation research of grease-releasing mechanism for oil-retaining bearing

Luo

Guo

Shi

et al. 2015

2015 International Conference on Fluid Power and Mechatronics (FPM)

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Focusing on oil-retaining bearing worked in water environment, simulation analysis of the whole oil-retaining bearing is carried out to investigate the grease-releasing mechanism of sintered metal-powder bearing, and the overflow process is simulated by way of water displacing oil. The result shows that threshold pressure gradient exists while oil flows, and the value of gradient has a complicated relationship with extent of porosity, but it is well correlated with permeability of bearing. The overflow speed of grease is dependent on porosity, the temperature of flow field, pressure, and the overflow speed rises while one of above-mentioned factors increases.

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Porous metal bearings — A critical review

Cited by 21 publications

References 69 publications

Importance of bearing porosity in engineering and natural lubrication

Importance of bearing porosity in engineering and natural lubrication

Analysis of Lubrication Regimes for Porous Sliding Bearing

Simulation research of grease-releasing mechanism for oil-retaining bearing

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