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Study on mechanical environments and tribo-failures at the operating surfaces of mechanical elements

Research Project

Project/Area Number 09450071
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

ICHIMARU Kazunori  Kyushu University, Graduate School of Engineering, Professor, 工学研究科, 教授 (60037760)

Co-Investigator(Kenkyū-buntansha) TANAKA Hiroyoshi  Kyushu University, Graduate School of Engineering, Research Associate, 工学研究科, 助手 (80264076)
MORITA Takehiro  Kyushu University, Graduate School of Engineering, Research Associate, 工学研究科, 助手 (70175636)
IZUMI Naoshi  Kyushu University, Graduate School of Engineering, Associate Professor, 工学研究科, 助教授 (60184579)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥11,300,000 (Direct Cost: ¥11,300,000)
Fiscal Year 1999: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1998: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1997: ¥8,900,000 (Direct Cost: ¥8,900,000)
KeywordsMixed lubrication / Surface roughness / Transient EHL / Direct contact / Rolling fatigue / Fretting wear / Contact stress / Contact of cylindrical bodies / 弾性流体潤滑 / ピッチング / き裂伝ぱ / き裂伝 / 多重格子法 / 有限体積法
Research Abstract

A numerical method of analysis for unsteady mixed elastohydrodynamic lubrication with direct contacts was developed. In order to make the analysis possible, three states of the contacting regions are distinguished, I.e., the hydrodynamic-film-formation, the direct contact and the cavitation regions, to which different equations are applied, respectively. in place of Reynolds equation applied to the hydrodynamic-film-formation region, elasticity equation is used as the governing equation of the direct-contact region. Not only pressure and film-thickness, but also the oil mass quantity at each point in the calculation region are always grasped and used to decided the state of the point and the governing equation. This numerical calculation method was applied to the cases where mixed elastohydrodynamic lubrication with direct contacts occurred.
Experimental study on false brinelling of ball bearings, which is identified as fretting wear caused by repeated microslip in raceways, has been conducted in oscillatory motion in order to investigate the effect of several operating conditions and lubrication on the service life. The state of oil-film formation was measured with the electric resistance method, and it was found that the life depends on the state of oil-film formation. The roughness of raceways can affect the state of oil-film formation and the life of ball bearings in oscillatory motion.
Experimental study on pitting has been conducted using two-roller machine. The surface of test rollers were recorded in video tape at every adequate loading cycles and evident pitting cracks observed after a long running were followed from an early state of running by reversing the time. The influences of the plastic flow direction and the rheological properties of lubricating oils were recognized significantly.

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] 市丸和徳: "直接接触を考慮した非定常点接触弾性流体潤滑の理論解析"日本機械学会論文集C編. 63-637. 3798-3803 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 和泉直志: "False Brinelling of Rolling Bearings in Oscillatory Motion"Proc.of the 4th International Joint Symp.berween Kyushu Univ.and Chungnam National Univ.. 7-12 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 市丸和徳: "線接触混合弾性流体潤滑下の突起間干渉状態の理論解析"日本機械学会論文集C編. (印刷中). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kazunori Ichimura and Xiaofei Du: "A Transient EHL Analysis for Point Contacts With Consideration of Direct Contacts"Trans. of JSME. Vol. 63-637C. 3798-3803 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Naoshi Izumi, Kazunori Ichimura, Nichiro Mimuro, Takehiro Morita and Takashi Shhiota: "FALSE BRINELLING OF ROLLING BEARINGS IN OSCILATORY MOTION"Proc. of the 4th International Joint Symp. between Kyushu Univ. and Chungnam National Univ.. 7-12 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kazunori Ichimura and Xiaofei Du: "An Analysis of Interaction In a Line Contact Under a Mixed Elastohydrodynamic Lubrication"Trans. of JSME. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 市丸 和徳: "直接接触を考慮した非定点線接触弾性流体潤滑の理論解析"日本機械学会論文集C編. 65・637. 3798-3803 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 和泉 直志: "False Brinelling of Rolling Bearings in Oscillatory Motion"Proc.ot the 4th International Joint Symp.betweem Kyushu Univ.and Chungnam National Univ,. 7-12 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 市丸 和徳: "トラクション油の転がり疲れ"日本トライボロジー学会トライボロジー会議予稿集. '99春東京. 191-192 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 市丸 和徳: "フラクタル表面を用いたEHL-直接接触の混合潤滑状態の解析"日本トライボロジー学会トライボロジー会議予稿集. '99秋高松. 179-181 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 和泉直志: "揺動転がり軸受の摩耗寿命に影響する諸因子"日本トライボロジー学会トライボロジー会議予稿集. '99秋高松. 465-467 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 市丸和徳: "運転初期の接触条件の違いがその後の転がり疲れに及ぼす影響"日本トライボロジー学会トライボロジー会議予稿集. '99秋高松. 468-470 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 市丸 和徳: "転がり疲れに関する実験的研究(塑性流動の影響)" 日本トライボロジー学会トライボロジー会議予稿集. ‘98春,東京. 111-113 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 市丸 和徳: "表面粗さを有する二円筒の弾性流体潤滑の理論的解析" 日本トライボロジー学会トライボロジー会議予稿集. ‘98春,東京. 179-181 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 和泉 直志: "揺動転がり軸受のフレッチング摩耗" 日本トライボロジー学会トライボロジー会議予稿集. ‘98春,東京. 491-493 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 市丸 和徳: "直接接触を考慮した非定常EHL解析" 日本トライボロジー学会トライボロジー会議予稿集. ‘98秋,名古屋. 179-181 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 和泉 直志: "揺動下の転がり軸受のフレッチングについて(第6報)" 日本トライボロジー学会トライボロジー会議予稿集. ‘98秋,名古屋. 465-476 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 市丸 和徳: "転がり疲れに及ぼす塑性流動の影響" 日本トライボロジー学会トライボロジー会議予稿集. ‘98秋,名古屋. 468-470 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 和泉 直志: "グリース潤滑した揺動転がり軸受の油膜形成とフレッチング摩耗" 日本トライボロジー学会トライボロジー会議予稿集. '97春,東京. 337-339 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 市丸 和徳: "転がり疲れに関する実験的研究(第3報)" 日本トライボロジー学会トライボロジー会議予稿集. '97春,東京. 435-437 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 市丸 和徳: "転がり疲れ寿命に及ぼす潤滑剤の影響" 日本トライボロジー学会トライボロジー会議予稿集. '97春,東京. 438-439 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 和泉 直志: "グリース潤滑した揺動転がり軸受の油膜形成とフレッチング摩耗(第2報)" 日本トライボロジー学会トライボロジー会議予稿集. '97秋,大阪. 376-278 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 市丸 和徳: "転がり疲れに関する実験的研究(第4報)" 日本トライボロジー学会トライボロジー会議予稿集. '97秋,大阪. 316-317 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 市丸 和徳: "点接触非定常弾性流体潤滑の理論解析について" 日本トライボロジー学会トライボロジー会議予稿集. '97秋,大阪. 507-509 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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