Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Failure Analysis of Ball Bearing Retainer Supporting Monorail Drive Roller

모노레일 주행 롤러 지지용 볼 베어링 리테이너의 파손 원인 분석

  • Seongmin Kang (Graduate School, Dept. of Mechanical Engineering, Gachon University) ;
  • Yong Seok Choi (Graduate School, Dept. of Mechanical Engineering, Gachon University) ;
  • Unseong Kim (Graduate School, Dept. of Mechanical Engineering, Gachon University) ;
  • Kyungeun Jeong (Graduate School, Dept. of Mechanical Engineering, Gachon University) ;
  • Seung-Jun Yang (Dept. of Mechanical Engineering, Gachon University) ;
  • Young Jin Park (Dept. of Mechanical Engineering, Gyeongsang National University) ;
  • Kyungjun Lee (Dept. of Mechanical Engineering, Gachon University)
  • 강성민 (가천대학교 대학원 기계공학과) ;
  • 최용석 (가천대학교 대학원 기계공학과) ;
  • 김운성 (가천대학교 대학원 기계공학과) ;
  • 정경은 (가천대학교 대학원 기계공학과) ;
  • 양승준 (가천대학교 기계공학과) ;
  • 박영진 (경상국립대학교 기계공학과) ;
  • 이경준 (가천대학교 기계공학과)
  • Received : 2024.10.04
  • Accepted : 2020.10.31
  • Published : 2024.10.31
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Abstract

This study evaluates the structural stability of the drive system of a monorail and investigates the causes of derailment accidents using finite element analysis. We assume a scenario where the gear pitch decreases by 1 mm owing to construction defects and perform dynamic analysis as the pinion gear traverses the abnormal pitch interval of the rack gear. The contact analysis between the rack and pinion gears reveals that the pinion gear collides in the abnormal pitch range due to the construction defect at the rack gear connection. The collision generates stresses exceeding the yield strength of the gear and rail materials, leading to plastic deformation. This study additionally investigates the bearings where the actual damage occurs utilizing the load data derived from the analysis. Findings indicate that plastic deformation and fatigue damage occurs in the bearing retainer and balls owing to the impact load, leading to ball detachment and retainer failure. Moreover, repetitive impact loads can rapidly degrade bearing durability, directly contributing to accidents. The findings of this study should be considered during the design, manufacturing, assembly, and maintenance processes of monorail system components, enhancing the safety through precise manufacturing and assembly practices.

Keywords

Acknowledgement

이 성과는 2018년도 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임 (No. 2018R1A5A7025522). 본 연구는 2023년도 산업통상자원부의 재원으로 한국에너지기술평가원(KETEP)의 지원을 받아 수행한 연구 결과입니다. (과제번호 : RS-2023-00302111)

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