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CHARACTERISTICS AND MECHANISM OF THREAD-LOOSENING BY REPETITION OF MINUTE SLIPPAGE OF BEARING SURFACE

Research Project

Project/Area Number 10650140
Research Category

Grant-in-Aid for Scientific Research (C)

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 InstitutionSHINSHU UNIVERSITY

Principal Investigator

KASEI Shinji  FACULTY OF ENG., SHINSHU UNIVERSITY, PROFESSOR, 工学部, 教授 (90016791)

Co-Investigator(Kenkyū-buntansha) MATSUOKA Hirohito  FACULTY OF ENG., SHINSHU UNIVERSITY, ASSISTANT, 工学部, 助手 (40209515)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1999: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1998: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsThread loosening / Minute slippage / Backward rotation / Impact load / Loosening mechanism / Loosening test / Locking design / ねじ / ゆるみ / 微小座面滑り / 軸直角外力 / 耐ゆるみ性能 / 衝撃作用
Research Abstract

Thread loosening under repetition of the bearing surface slippage with order of micrometer or sub-micrometer was investigated. The research objects are loosening mechanism and loosening test method, and basic items for locking design are considered.
(1) With assumption that small change of torsion torque of a bolt shard generated by external force is the major factor to generate backward rotation, behavior from action of external force to occurrence of backward rotation is explained.
(2) Experiments are carried out by using the self-made apparatus. It can apply successive impacts to the joint fastened by a test bolt and nut in the one direction perpendicular to the bolt axis. Thread size for the experiments is M10 or M10 × 1.25. From the experimental results, it is clearly known that the rotational loosening can occur easily and progress in this condition, and it is ascertained that the way of thinking about loosening mechanism is roughly applicable to the case.
(3) Experimental results about some kinds of nut sample shows that relative merits between test samples can be evaluated by this method. This method also has possibility to enable more fine evaluation concerning locking performance, for instance discrimination between the non-rotational loosening and the rotational one.
(4) Fundamental items are presented for locking design. They are prevention of slip on a connecting surface between fastened bodies, permanent deformation of a bearing surface and shapes of bolt and nut. As one of the last item, FEM results being presented on pressure distribution on bearing surfaces, perhaps concerned with locking performance, high influence sensitivity given by angle of the bearing surface is shown.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report

Research Products

(12 results)

All Other

All Publications (12 results)

  • [Publications] 岡田学、賀勢晋司、田中道彦: "有限要素解析によるボルト、ナットの座面圧分布の検討(フランジボルトの座面直角度が及ぼす影響)"JSME関西支部第257回講演会講演論文集. No.994-2. 7-3-4 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 賀勢晋司、松岡浩仁、大澤哲也: "ねじのゆるみ止め性能評価について(微小座面滑りの累積によるゆるみ試験)"JSME関西支部第257回講演会講演論文集. No.994-2. 7-5-6 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 賀勢晋司: "ねじの回転ゆるみ(主にその機構について)"東工大精研第32回シンポジウム講演予稿集. 15-19 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S.Kasei,H.Matsuoka: "Considerations of Thread-Loosening by Transverse Impacts"(ASME/JSME PVP98)ANALYSIS OF BOLTED JOINTS-1998-. PVP-Vol.369. 117-123 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. Kasei, H. Matsuoka: "Considerations of Thread-Loosening by Transverse Impacts"(ASME/JSME PVP98) ANALYSIS OF BOLTED JOINTS -1998-. PVP-Vol.369. 117-123 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Okada, S. Kasei, M. Tanaka: "Considerations on Bearing Surface Pressure Distribution of Bolt-Nut Joints by Finite Elements Analysis (Influence by Perpendicularity of Bearing Surface of Flange Bolt) (in Japanese)"JSME Kansai, Proceedings of 257th meeting. No. 994-2. 7-3-4 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. Kasei, M. Matsuoka, T. Ohsawa: "On Evaluation of Locking Performance of Threaded Joints (Thread-Loosening Test Basing on Accumulation of Minute Slippage of Bearing Surface) (in Japanese)"JSME Kansai, Proceedings of 257th meeting. No. 994-2. 7-5-6 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. Kasei: "Thread-Loosening by Backward Rotation (About Its Mechanism) (in Japanese)"P & I Lab., TIT, Proceedings of 32nd Symposium. 15-19 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 岡田学、賀勢晋司、田中道彦: "有限要素解析によるボルト、ナットの座面圧分布の検討(フランジボルトの座面直角度が及ぼす影響)"JSME関西支部第257回講演会講演論文集. No.994-2. 7-3-4 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 賀勢晋司、松岡浩仁、大澤哲也: "ねじのゆるみ止め性能評価について(微小座面滑りの累積によるゆるみ試験)"JSME関西支部第257回講演会講演論文集. No.994-2. 7-5-6 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 賀勢晋司: "ねじの回転ゆるみ(主にその機構について)"東工大精研第32回シンポジウム講演予稿集. 5 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] S.Kasei, H.Matsuoka: "Considerations of Thread-Loosening by Transverse Impacts" (ASME/JSMEPVP98)ANALYSIS OF BOLTED JOINTS -1998-. PVP-VOL.367. 117-123 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-03-31   Modified: 2016-04-21  

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