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2003 Fiscal Year Final Research Report Summary

ESTABLISHMENT OF THERMAL ELASTOHYDRODYNAMIC LUBRlCATION

Research Project

Project/Area Number 13450067
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 設計工学・機械要素・トライボロジー
Research InstitutionKyushu Institute of Technology

Principal Investigator

NISHIKAWA Hiroshi  Kyushu Institute Of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (40208161)

Co-Investigator(Kenkyū-buntansha) MATSUDA Kenji  Kyushu Institute Of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (40229480)
Project Period (FY) 2001 – 2003
KeywordsThermal EHL / EHL / Temperature-viscosity wedge action / Dimple / Thermal conductivity / Slide-roll ratio / Machine Elements / Tribology
Research Abstract

When there is a difference in thermal conductivity of the contact materials in concentrated rolling/sliding contacts, the surface temperature of the material having a low thermal conductivity is higher than that of the material having a high thermal conductivity. Consequently, the temperature and viscosity of the lubricating oil vary across the oil film. In particular, when the surface velocity of the material having a low thermal conductivity is larger than that of the material having a high thermal conductivity, an extra pressure peak is generated, and thus a thick film or a dimple is formed by the temperature-viscosity wedge action. The film pressure peaks play an important role in the formation of dimple, and multi-dimples are caused by the cooperated interaction of the main pressure peak and pressure spike. The experimental results can be explained in more detail by considering three dimensional energy balance and non-Newtonian oil flow behavior. The other important results obtain … More ed are summarized as follows :
1.In elliptical contacts, when the oil entrainment vector is directed along the minor principal axis of the contact ellipse, the dimples formed are stable, but when the entrainment vector is directed along the major principal axis, the dimples formed are unstable. The change of the entrainment angle plays an important role in the temperature distribution but does not influence the maximum temperature. The traction coefficient hardly depends on the entrainment angle.
2.When the slide-roll ratio is small enough, the traction coefficient is controls by the compressive heating and non-Newtonian flow behavior. The effect of the viscous heating on the traction coefficient increases with increasing in the slide-roll ratio.
3.In cases where the contacting materials have the same thermal conductivity, a larger thermal conductivity leads to a larger traction coefficient and overall film thickness. When the thermal properties of the contacting materials differ each other, the velocity of the surface having a high thermal conductivity should be larger than that having a low thermal conductivity, in order to prevent the rolling contact, fatigue. Less

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 王静, 楊沛然, 兼田〓宏, 西川宏志: "熱弾流潤滑楕円接触区内表面凹陥現象的研究"摩擦学学報. 21-6. 478-481 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yang, P., Kaneta, M.: "Multi-Dimple Phenomena in TEHL Point Contacts"Science in China. 45-2. 127-134 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kaneta, M., Kawashima, R., Masuda, S., Nisikawa, H., Yang, P., Wang, J.: "Thermal Effects on the Film Thickness in Elliptical EHL Contacts WithEntrainment Along the Major Contact Axis"Journal of Tribology, Trans.ASME. 124-2. 420-427 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wang, J., Yang.P., Kaneta, M., Nishikawa, H.: "On the Surface Dimple Phenomena in Elliptical TEHL Contacts With Arbitrary Entrainment"Journal of Tribology, Trans.ASME. 125-1. 102-109 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yang, P., Kaneta, M., Masuda, S.: "Quantitative Comparisons Between Measured and Solved EHL Dimples in Point"Journal of Tribology, Trans.ASME. 125-1. 210-214 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kaneta, M., Yang, P.: "Formation Mechanism of Steady Multi-Dimples in Thermal EHL Point Contacts"Journal of Tribology, Trans.ASME. 125-2. 241-251 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kaneta, M., Yang, P.: "Effects of Thermal Conductivity of Contacting Surfaces on Point EHL Contacts"Journal of Tribology, Trans.ASME. 125-4. 731-738 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 対暁玲, 楊沛然, 兼田〓宏: "基于表面凹陥現象的非頓熱弾流潤滑分析"摩擦学学報. 23-5. 406-410 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kaneta, M., Tani, N., Nishikawa, H.: "Optical Interferometric Observations of the Effect of Moving Transverse Asperities on Point Contact EHL Films"Tribology Series 41,Tribological Research and Design for Engineering Systems, Proceedings of the 29th Leeds-Symposium on Tribology, Elsevier. 101-112 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wang, J., Yang, P., Kaneta, M., Nishikawa, H.: "On the Surface Dimple Phenomena in Thermal Elastohydro-dynamic Lubrication Elliptical Contact (in Chinese)"Tribology. Vol.21, No.6. 478-481 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yang, P., Kaneta, M.: "Multi-Dimple Phenomena in TEHL Point Contacts"Science in China. Vol. 45, No.2. 127-134 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kaneta, M., Kawashima, R., Masuda, S., Nisikawa, H., Yang, P., Wang, J.: "Thermal Effects on the Film Thickness in Elliptical EHL Contacts With Entrainment Along the Major Contact Axis"Journal of Tribology, Trans.ASME. Vol.124, No.2. 102-109 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wang, J., Yang, P., Kaneta, M., Nishikawa, H.: "On the Surface Dimple Phenomena in Elliptical TEHL Contacts With Arbitrary Entrainment"Journal of Tribology, Trans.ASME. Vol.125, No.1. 210-214 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yang, P., Kaneta, M., Masuda, S.: "Quantitative Comparisons Between Measured and Solved EHL Dimples in Point Contacts"Journal of Tribology, Trans.ASME. Vol.125, No.1. 241-251 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kaneta, M., Yang, P.: "Formation Mechanism of Steady Multi-Dimples in Thermal EHL Point Contacts"Journal of Tribology, Trans.ASME. Vol.125, No.2. 241-251 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kaneta, M., Yang, P.: "Effects of Thermal Conductivity of Contacting Surfaces on Point EHL Contacts"Journal of Tribology, Trans.ASME. Vol.125, No.4. 731-738 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Liu, X-L., Yang, P., Kaneta, M.: "Analysis Of non-Newtonian Thermal Elastohydrodynamic Lubrication Based on Surface Dimple Phenomenon (in Chinese)"Tribology. Vol.23, No.5. 406-410 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kaneta, M., Tani, N., Nishikawa, H.(Eds.D.Dowson et al.): "Tribology Series 41, Tribological Research and Design for Engineering Systems. Optical Interferometric Observations of the Effect of Moving Transverse Asperities on Point Contact EHL Films"Elsevier. 101-112 (2003)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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