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과다 예압을 받는 테이퍼롤러 베어링의 수명단축효과에 대한 실험적 연구
박종원(J. W. Park),김형의(H. E. Kim),김종억(J. E. Kim),심양진(Y. J. Sim),정원욱(W. U. Jung) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Tapered roller bearings are core component for rotating machine that endure axial and radial load simultaneously. Especially tapered roller bearings used for input and output shaft of transmission the life shortening effect as excessive axial pre-load, which can be occurred in assembly line of transmission, was frequently reported in that case. In this study, we derived the equation for the life of tapered roller bearing in case of excessive pre-load by accelerated life test. DOE method and FEA was used for designing the accelerated life test condition. The derived life equation of tapered roller bearing calculated longer life than the exited L₁? bearing life equation. Because we analyzed the accelerated life test results with Weibull distribution. The result of this study will be helpful to predict the life of tapered roller bearing in case of excessive pre-load and design that kind of rotating machines.
충격 압력을 받는 파워스티어링 시스템의 고압호스 수명 예측
이기천(G. C. Lee),김형의(H. E. Kim),박종원(J. W. Park),정원욱(W. W. Jeong),임영한(Y. H. Lim),김재훈(J. H. Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Hydraulic hose can be divided with low pressure, medium pressure, and high pressure hose according to applied pressure. Power steering system in passenger car can be divided with high pressure and low pressure hose. This study deals with the life prediction for high pressure hose to be given impulse pressure which was generated in turning the car. To adjust with external and internal condition, impulse pressure and oil temperature need to be controlled with impulse test system. The result, which is only controlled with the pressure and oil temperature, adapted Calibrated Accelerated Life Test(CALT) method to predict the life of high pressure hose and analyzed the swagging part by finite element method during impulse test.