Journal of Aerospace System Engineering (항공우주시스템공학회지)

The Society for Aerospace System Engineering (항공우주시스템공학회)
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Stress & Life Evaluation of Cylindrical Roller Bearing for Aircraft Gearbox according to Roller Profile Shape

롤러 프로파일에 따른 항공용 기어박스 원통 롤러 베어링의 응력 및 수명 평가

  • Jae-Hyun, Kim (Department of Biosystems Engineering, Seoul National University) ;
  • Hyun-Woo, Han (Department of Biosystems Engineering, Seoul National University) ;
  • Dongu, Im (Department of Biosystems Engineering, Seoul National University) ;
  • Jung-Ho, Park (Department of Biosystems Engineering, Seoul National University) ;
  • Su-Chul, Kim (Department of Smart Industrial Machinery, Korean Institute of Machinery & Materials) ;
  • Young-Jun, Park (Department of Biosystems Engineering, Seoul National University)
  • 김재현 (서울대학교 바이오시스템공학과) ;
  • 한현우 (서울대학교 바이오시스템공학과) ;
  • 임동우 (서울대학교 바이오시스템공학과) ;
  • 박정호 (서울대학교 바이오시스템공학과) ;
  • 김수철 (한국기계연구원 스마트산업기계연구실) ;
  • 박영준 (서울대학교 바이오시스템공학과)
  • Received : 2022.08.26
  • Accepted : 2022.10.27
  • Published : 2022.12.31
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Abstract

This study aims to evaluate the stress and life of cylindrical roller bearings used in aircraft gearboxes, and to select a roller profile that minimises the contact stress between bearing rollers and raceways. The mounting clearance of four points contact ball bearing was determined, so that cylindrical roller bearings support all radial loads, and the bearing mounting position was determined to maximise the bearing lives. In addition, the static safety factor and dynamic life of bearing were predicted according to ISO 76 & ISO/TS 16281 using the load spectrum determined based on the operating load cases of aircraft gearboxes. Furthermore, the optimal roller profile was selected by analysing the contact stress according to the roller profile shape, and the safety of each roller was evaluated. The results stated that the required safety factor and lifetime were satisfied, and Johns Gohar roller profile was optimal.

본 연구의 목적은 항공용 기어박스에 사용되는 원통 롤러 베어링의 응력과 수명을 평가하고, 베어링 롤러와 전동륜 사이에 작용하는 접촉 응력을 최소화하는 롤러 프로파일을 선정하는 것이다. 원통 롤러 베어링이 모든 반경 방향 하중을 지지하도록 4점 접촉 볼 베어링의 설치 간극을 결정하였고, 베어링의 수명을 최대화하는 베어링 설치 위치를 결정하였다. 또한, 항공용 기어박스의 작동 조건을 기반으로 결정된 하중 스펙트럼을 이용하여 베어링의 정적 안전 계수와 동적 수명을 각각 ISO 76과 ISO/TS 16281로 예측하였다. 추가로, 롤러 프로파일 형상에 따른 접촉 응력을 해석하여 최적의 롤러 프로파일을 선정하였고, 롤러의 안정성을 평가하였다. 그 결과, 요구되는 안전 계수와 수명을 모두 만족하였으며, Johns Gohar 롤러 프로파일이 최적의 롤러 프로파일임을 확인하였다.

Keywords

Acknowledgement

'김재현'과 '한현우'는 공동 제 1저자이며, 동등하게 기여하였음. 이 논문은 2022년 정부(방위사업청)의 재원으로 국방기술진흥연구소의 지원을 받아 수행된 연구임 (19-106-805-058).

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