Analysis on elastohydrodynamic lubrication in grease-lubricated ball bearings considering film thickness correction
ObjectiveTo study the lubrication characteristics of grease-lubricated rolling ball bearings, such as film thickness and pressure variations in elastohydrodynamic lubrication with elliptical point contact, a numerical analysis model of elastohydrodynamic grease lubrication was constructed.MethodsThi...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Journal of Mechanical Transmission
2025-08-01
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| Series: | Jixie chuandong |
| Subjects: | |
| Online Access: | http://www.jxcd.net.cn/thesisDetails#DOI：10.16578/j.issn.1004.2539.2025.08.017 |
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| Summary: | ObjectiveTo study the lubrication characteristics of grease-lubricated rolling ball bearings, such as film thickness and pressure variations in elastohydrodynamic lubrication with elliptical point contact, a numerical analysis model of elastohydrodynamic grease lubrication was constructed.MethodsThis model was based on the Herschel-Bulkley rheological model of lubricating grease and included the constitutive equation for grease, Reynolds equation, film thickness equation, viscosity-pressure equation, density-pressure equation, and load balance equation. Then, a modified film thickness formula proposed, based on the Hamrock-Dowson approach, was applied to calculate and adjust the film thickness within the model. Finally, the model was solved numerically using a direct iteration method to analyze the effects of different rheological indices, ellipticity, entrainment speeds, and loads on the film thickness and pressure of the grease. The results were also compared with the film thickness and pressure trends of Newtonian fluids under the same conditions of ellipticity, entrainment speed, and load.ResultsThe results show that the model solutions, which account for film thickness modifications, more closely match the test data. Additionally, as the entrainment speed and rheological index decrease, the grease film thickness decreases, and the grease film pressure in the contact area approaches the maximum Hertz pressure. As the ellipticity increases, the peak grease film pressure significantly decreases, and the film thickness slightly increases. Compared to Newtonian fluids, the impact of load and entrainment speed on the lubrication film thickness and pressure distribution in the grease lubrication is smaller. |
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| ISSN: | 1004-2539 |