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Study on Accelerated Life Testing of Swing Reduction Gear Box for Hybrid Excavator

하이브리드 굴삭기용 선회감속기의 가속수명시험에 관한 연구

  • Park, Jong Won (Reliability Assessment Center, Korea Institute of Machinery & Materials) ;
  • Choi, Byung Oh (Reliability Assessment Center, Korea Institute of Machinery & Materials) ;
  • Kim, Kyeong Keun (Doosan Institute of Technology)
  • 박종원 (한국기계연구원 신뢰성평가센터) ;
  • 최병오 (한국기계연구원 신뢰성평가센터) ;
  • 김경근 ((주)두산인프라코어 기술원)
  • Received : 2012.12.28
  • Accepted : 2013.09.25
  • Published : 2013.11.01

Abstract

The swing motion drive unit of a hybrid excavator is composed of an electrical motor instead of a hydraulic motor that is used in hydraulic excavators. The method to assess and guarantee the reliability of a hybrid excavator should consider combining the mechanical and the electrical failure mode effects. In particular, the swing reduction gear set of a hybrid excavator is operated under severe outdoor conditions; therefore, an accelerated life test, which is based on field operating condition, should be conducted for the newly developed reduction gear set. In this study, various qualitative methods for reliability engineering, such as FMMA, FMECA, FTA, and QFD, were used to develop the accelerated life test method for the swing drive reduction gear set for the hybrid excavator.

Keywords

Hybrid Excavator;Swing Reduction Gear Box;Failure Mode;Accelerated Life Test

Acknowledgement

Grant : 하이브리드 굴삭기 핵심기술개발

Supported by : 산업통상자원부

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