• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1997 Fiscal Year Final Research Report Summary

Mechanism of Thin Film Lubrication

Research Project

Project/Area Number 08455083
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 UNIVERSITY

Principal Investigator

YAMAMOTO Yuji  Kyushu University, Faculty of Engineering, Professor, 工学部, 教授 (10037997)

Co-Investigator(Kenkyū-buntansha) ONO Bunji  Kyushu University, Faculty of Engineering, Research Associate, 工学部, 助手 (60224276)
GONDO Seigo  Kyushu University, Faculty of Engineering, Research Associate, 工学部, 助手 (50037975)
SUGIMURA Joichi  Kyushu university, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20187660)
Project Period (FY) 1996 – 1997
KeywordsLubricant / Thin film / Viscoelastic / elastoplastic / Glass transition / limiting ahear atrength
Research Abstract

Mechanism and of thin film lubrication and shear characteristics of solidified lubrication film were studied.
1.Shear properties of lubricant at low temperature : The shearing or sliding occurred within a thin shear layr in an oil and the oil behaved as a viscoelastic or elastoplastic material. Shear stress tau was expressed by tau=a exp (E/RT). Here, a, E,R,and T are an constant, activation energy, gas constant and absolute temperature, reapectively.
2.Traction properties in concentrated contact : The coefficient of traction was mainly determined by alphap of a product alpha multiplied by p. alphap is a measure of the packing state of oils subjected to shearing.
3.Limiting ability of oils to built up a hydrodynamic lubrication film : There is a critical sliding speed above which the oil film thickness inversely decreased in spite of increasing the sliding speed or the value of bearing modulus. The friction force also decreased with increasing the sliding speed above the critical one. Therse phenomena were mainly ascribed to that only the lower viscosity components of the supplied oil were prone to be introduced to the conjunction zone.
4.Ultra thin film behavior in accelerating and decelerating motion : The oil film thickness in changing sliding speed tests was not equal to that in the corresponding constant sliding apeed. The difference in oil film thickness was brought mainly about squeeze action.

  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] B.ONO: "Limiting Ability of Oils to Build up Hydrodynamic Lubrication Film under Sliding Contact Conditions" Proc.International Tribology Conference,YOKOHAMA. 981-986 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.SUGIMURA: "Technique for Measuring EHD Film Thickness in Non-Steady State Contact Conditions" Elast hydrodynamics-'96 Foundamentals and Applications in Lubrication and Traction. 91-100 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 佐藤 昌彦: "薄膜潤滑とマイクロキャビティーの蛍光顕微鏡による測定" 日本機械学会講演論文集. 978. 211-213 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小野 文慈: "潤滑油の油膜形成能力(その2)" トライボロジー会議予稿集 東京 1997-5. 469-471 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 金 重〓: "代替冷媒用潤滑油の摩擦摩耗特性" トライボロジー会議予稿集 堺 1997-11. 287-289 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] B.ONO,Y.YAMAMOTO: "Limiting Ability of Oils to build up Hydrodynamic Librication Film under Sliding Contact Conditions" Proceedings of Tribology Yokohama. 981-986 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.Sugimura, H.A.Spokes: "Technique for Measuring EHD Film Thickness in Non-Steady State Contact Conditions" Elastohydrodynamics-'96 Foudamentals and Application in Lubrication and Traction. 91-100 (1997)

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

URL: 

Published: 1999-03-16  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi