Modified Reynolds Equation for Confined High Viscosity Film Lubrication and Lubrication Analysis of Micro-Tapered Pad Bearing
| Autor: | Kyosuke Ono |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
thin film lubrication
modified reynolds equation confined high viscosity film engine oil additives tapered pad bearing lubricant rheology adsorbed lubricant film synthetic lubricant viscosity Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 |
| Zdroj: | Tribology Online, Vol 18, Iss 6, Pp 330-338 (2023) |
| Druh dokumentu: | article |
| ISSN: | 1881-2198 |
| DOI: | 10.2474/trol.18.330 |
| Popis: | This study proposes a mathematical expression for the high-viscosity surface layer generated by the confinement of a lubricant film, which is evident in engine oil with a metallic detergent additive. The characteristics of a microtapered pad bearing lubricated by a confined high-viscosity film were clarified by solving a modified Reynolds equation for the confined high-viscosity lubricant film. The load capacity began to increase compared with that in the bulk viscosity case when the trailing gap decreased from twice the saturated high-viscosity layer thickness. The maximum value of the friction coefficient at the trailing gap near the layer thickness becomes remarkable compared with the case of the adsorbed high-viscosity layer model. Assuming that the increased effective viscosity caused by the confinement of the lubricant film is due to an adsorbed high-viscosity layer, the load capacity is significantly overestimated when the trailing gap is greater than the saturated high-viscosity layer thickness. Next, a mathematical expression of the synthetic viscosity of a lubricant with a polar additive having an adsorbed high-viscosity surface layer and a metallic detergent additive with a confined high-viscosity layer was proposed, and the characteristics of the microtapered pad bearings lubricated by the composite lubricant were investigated. |
| Databáze: | Directory of Open Access Journals |
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