2007 Fiscal Year Final Research Report Summary
Establishment of Non-Newtonian Thermal Elastohydrodynamic Lubrication Theory
| Project/Area Number |
15002009
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| Research Category |
Grant-in-Aid for Specially Promoted Research
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
Engineering
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
KANETA Motohiro Kyushu Institute of Technology, Faculty of Engineering, Professor (90039123)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIKAWA Hiroshi Kyushu Institute of Technology, Faculty of Engineering, Research Associate (40208161)
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| Project Period (FY) |
2003 – 2007
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| Keywords | Thermal Elastohydrodynamic Lubrication / Film Thichkness / Traction / Film Pressure / Surface Roughness / Film Temperature / Rheology / Tribology |
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| Research Abstract |
Isothermal elastohydrodynamic lubrication (EHL) theory has played an important role for improving the working performance, function and durability of machine elements having a concentrated contact between non-conforming surfaces. The basis of non-Newtonian thermal elastohydrodynamic lubrication theory has been established by reconsidering the isothermal EHL theory from the theoretical and experimental viewpoints which consider temperature distributions in all directions in the contact.
1. The limitation of isothermal EHL analysis has been elucidated experimentally. It is also found that the EHL regime is divided into three types, i.e., over flooded, fully flooded and starved.
2. By using transversely oriented ridges, the causes of surface failures have been discussed from experimental viewpoints. A non-Newtonian numerical analysis method for the thermal EHL problems in point contacts has been developed, and the effects of surface roughness on the film thickness profile, distributions of
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pressure and temperatures and the traction coefficient have been discussed. Furthermore, the effects of the surface roughness orientation and the ellipticity ratio of the contacts on surface failures have been discussed. Based on the oil film temperature measurements for rough-smooth surfaces, it has been proved that the oil in EHL contacts behaves as a non-Newtonian fluid.
3. The film pressure distribution, which affects the rolling contact fatigue phenomenon, depends on the thermal conductivities of both contacting surfaces, slide-roll ratio and pressure-viscosity coefficient. The compressive heating plays a significant role on the traction coefficient at very low slide-roll ratios.
4. The effects of impact loads under rolling/sliding conditions have been discussed.
5. Tribo-characteristics under reciprocating motion have been discussed from experimental and theoretical viewpoints.
6. Based on the results described in above, the mechanism of oil film breakdown of reciprocating seals, the mechanism of soot wear have been clarified, and a new device, which can detect the dielectric breakdown of the grease EHL film, has been developed. Less
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Research Products
(136 results)
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[Journal Article] Development of Grease Film Breakdown Observing Device2008
Author(s)
Sunahara, K., Yamashita, S., Yamamoto, M., Ikeda, M., Nishikawa, H., Matsuda, K., Kaneta, M.
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Journal Title
Tribology Online Vol. 3, No. 2 (to be published)
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Effects of Longitudinal Roughness on Fluid Temperature in Point Elastohydrodynamic Lubrication Contacts2007
Author(s)
Nishikawa, H., Ueda, K., Kaneta, M., Wang, J., Yang, P.
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Journal Title
Journal of Engineering Tribology, Proc. I. Mech. E. Vol. 221
Pages: 793-799
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Occurrence of a Noncentral Dimple in Squeezing EHL Contacts2006
Author(s)
Guo, F., Kaneta, M., Wang, J., Nishikawa, H., Yang, P.
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Journal Title
Journal of Tribology, Trans. ASME. Vol. 128
Pages: 632-640
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Development of Grease Film Breakdown Observing Device2007
Author(s)
Sunahara, K., Yamashita, S., Yamamoto, M., Nishikawa, H., Kaneta, M.
Organizer
Tribology Conference
Place of Presentation
Saga, Japan
Year and Date
2007-09-28
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Tribo-Characteristics of Point Contact EHL Films in Short Stroke Reciprocating Motion2006
Author(s)
Wakamizu, Y., Hashimoto, T., Wang, J., Nishikawa, H., Kaneta, M.
Organizer
JAST Tribology Conference
Place of Presentation
Tokyo, Japan
Year and Date
2006-05-17
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Friction Characteristics of Reciprocating Seals2006
Author(s)
Hiromatsu, N., Togami, S., Nishikawa, H., Kaneta, M., Kanzaki, Y.
Organizer
JAST Tribology Conference
Place of Presentation
Tokyo, Japan
Year and Date
2006-05-15
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Thermal EHL Theory2005
Author(s)
Kaneta, M.
Organizer
The 2005 International Symposium on the Tribology of Vehicle Transmissions
Place of Presentation
Tsukuba, Japan (Keynote Speech)
Year and Date
20050216-20050218
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 混合グリースの潤滑特性2004
Author(s)
江浪 健宏
Organizer
日本トライボロジー学会トライボロジー会議
Place of Presentation
鳥取
Year and Date
2004-11-12
Description
「研究成果報告書概要(和文)」より
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