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Development of a Shrink Fitter for Ceramics Bearings

Research Project

Project/Area Number 07555053
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field 設計工学・機械要素・トライボロジー
Research InstitutionNiigata University

Principal Investigator

NITTA Isami  Niigata University, Graduate School, Science and Technology, Associate Professor, 自然科学研究科, 助教授 (30159082)

Co-Investigator(Kenkyū-buntansha) TAKEBAYASHI Hiroaki  Koyo Seiko Co., Ltd., Vice-Director., 軸受開発部, 次長
IWABUCHI Akira  Iwate University, Faculty of Engineering, Professor, 工学部, 教授 (00005555)
YOKOYAMA Makoto  Niigata University, Faculty of Engineering, Lecturer, 工学部, 講師 (20230667)
HARA Toshiaki  Niigata University, Faculty of Engineering, Professor, 工学部, 教授 (50134953)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1996: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥5,400,000 (Direct Cost: ¥5,400,000)
KeywordsCeramic Bearing / Shrink Fitter / Elevated Temperature / Interstice / Vibration
Research Abstract

All ceramic ball bearings of Si_3N_4, type 6204, were used to examine an effects of a shrink fitter, a new machine element, on the bearing life. The shaft and the housing were made of a high Cr steel, SUJ2. The material of the cage of the ceramic bearing was stainless steel, SUS304. Two kinds of oils were used as lubricants. A rotational speed of a test machine was 7,000 rpm.
The interferences between the ceramic bearing and a metal shaft, and between the ceramic and a metal housing, will increase and decrease at elevated temperature, since their coefficient of thermal expansions are different from each other. The interstice between the ceramic bearing and the metal housing can be thought to cause a large bending moment of the outer race of the bearing and lead to a failure of the outer race. If the shrink fitter of aluminum alloy, A2017, is placed at the interface between the bearing and the housing, such interstice will never appear even at the elevated temperature, because of the sufficient thermal expansion of the shrink fitter. Therefore the bending moment of the outer race, which shorten the bearing life will never exist.
We confirmed the effect of the shrink fitter on the bearing life experimentally. The life of the ceramic bearing with the shrink fitter was longer than that without the shrink fitter.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 新田 勇、佐藤 秀則 竹林 博明: "シュリンクフィッタを用いたセラミックスベアリングの長寿命化" 日本機械学会第74期全国大会講演論文集(IV) No. 96-15. 19-20 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Isami NITTA,Hidenori SATO,Hiroaki TAKEBAYASHI: "Effect of a Shrink Fitter on Ceramic Bearing Life" Proceedings of The 74th JSME falt annual meeting. (IV).No.96-15. 19-20 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 新田勇、佐藤秀則、竹林博明: "シュリンクフィッタを用いたセラミックスベアリングの長寿命化" 日本機械学会第74期全国大会講演論文集(IV)No.96-15. 19-20 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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