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Study on Load Bearing Capacity of Gears in Special Environment

Research Project

Project/Area Number 63550121
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 機械要素
Research InstitutionTottori University

Principal Investigator

ODA Satoshi  Faculty of Eng., Tottori Univ., Professor, 工部学, 教授 (50032016)

Co-Investigator(Kenkyū-buntansha) KAWAGOE Haruo  Faculty of Eng., Tottori Univ., Professor, 工学部, 教授 (60032009)
KOIDE Takao  Faculty of Eng., Tottori Univ., Assoc. Prof., 工学部, 助教授 (60127446)
MIYACHIKA Kouitsu  Faculty of Eng., Tottori Univ., Assoc. Prof., 工学部, 助教授 (30157664)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1990: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1989: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1988: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsGear / Vacuum / Low Temperature / Bending Fatigue Strength / Impact Strength / Coefficient of Friction / Wear / Efficiency / 温度 / 侵炭焼入れ / 硬化層厚さ
Research Abstract

The impact and bending fatigue strengths of case-hardened gears with various case depths at low temperature (-60゚C) were investigated. For this experiment were used gear impact testing equipment and a gear bending fatigue testing machine of hydraulic loading type with a cooling chamber. The impact and bending fatigue strength of case hardened gears at room and low temperature, and the effects of case depths on these strengths were clarified considerably.
The friction and wear characteristics of gears in vacuum were also investigated. The gear testing machine of power circulating type with a vacuum chamber was developed, in which the coefficient of friction between the contacting tooth surfaces, and the temperatures of the gear teeth and the shaft can be measured under various running conditions. The running tests for S45C, MoS_2 coated SUS440C, Duracon and Nylon gears were carried out in air and vacuum environment by using the gear testing machine, and the coefficient of friction betwee … More n the contacting tooth surfaces, the wear of the gear teeth and temperature changes of the gear teeth, the shaft, etc. were measured. On the basis of these results, the friction and wear characteristics of gears in vacuum were clarified to a considerable extent.
The main results obtained from this investigation are summarized as follows.
1. The bending fatigue strength of case-hardened gears at low temperature (- 60゚C) is larger than that at room temperature, but the impact strength at low temperature is smaller.
2. The optimum case depth exists for the bending fatigue strength of case-hardened gears at low and room temperatures. The impact strength decreased with an increasing case depth.
3. The coefficient of friction of S45C gears in vacuum is larger that in air, but those of MoS_2 coated SUS440C, Duracon and Nylon gears in vacuum are almost equal to those in air.
Thus the load bearing capacity of gears at low temperature and in vacuum was clarified, and the useful data for the design of gears in special environment were obtained from this investigation. Less

Report

(4 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 小田 哲: "低温下における浸炭焼入れ歯車の衝撃および曲げ疲労強度" 日本機械学会論文集(C編). 55ー518. 2587-2590 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 坪倉 公治: "低温下における浸炭焼入れ歯車の曲げ疲労強度に及ぼす 衝撃荷重の影響" 日本機械学会講演概要集. 885ー2. 128-129 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 小田 哲: "真空中における歯車の摩擦・摩耗特性" 日本機械学会講演論文集. 900ー59. 190-192 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Oda, Satoshi: "Impact and Bending Strength of Case-Hardened Gears at Low Temperature" Trans. Jpn. Soc. Mech. Eng.Vol. 55, No. 518. 2587-2590 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Tsubokura, Koji: "Effect of Impact Load on Bending Fatigue Strength of Case-Hardened Gears at low Temperature" Prepr. of Jpn. Soc. Mech. Eng.No. 885-2. 128-129 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Oda, Satoshi: "Friction and Wear Characteristics of Gears in Vacuum" Prepr. of Jpn. Soc. Mech. Eng.No. 900-59. 190-192 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 小田 哲: "低温下における浸炭焼入れ歯車の衝撃および曲げ疲労強度" 日本機械学会論文集(C編). 55ー518. 2587-2590 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] 坪倉 公治: "低温下における浸炭焼入れ歯車の曲げ疲労強度に及ぼす衝撃荷重の影響" 日本機械学会講演概要集. 885ー2. 128-129 (1988)

    • Related Report
      1990 Annual Research Report
  • [Publications] 小田 哲: "真空中における歯車の摩擦・摩耗特性" 日本機械学会講演論文集. 900ー59. 190-192 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 小田哲: "低温下における浸炭焼入れ歯車の衝撃および曲げ疲労強度" 日本機械学会論文集(C編). 55. 2587-2590 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 坪倉公治: "低温下における浸炭焼入れ歯車の曲げ疲労強度に及ぼす衝撃荷重の影響" 日本機械学会講演概要集. 885-2. 128-129 (1988)

    • Related Report
      1989 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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