Prediction of the Fatigue Life of Deep Groove Ball Bearing Under Radial and Moment Loads - Fatigue Life Tests and Proposal of the Life Adjustment Factors

반경방향과 모멘트하중 하에서의 깊은홈 베어링의 피로수명평가 - 수명시험 및 수명보정계수 제안

In this paper, using the formulation of dynamic equivalent load considering the effects of moment load and the equation to estimate the cage rotational speed, the new life equation of deep groove ball bearing under radial and moment loads was proposed. Fatigue life test apparatus with the measuring equipment of shaft and cage speed was designed and developed to be capable of subjecting combined radial and moment load. Fatigue life tests were executed by sudden death test method and the reliability of fatigue lives was evaluated by Weibull distribution analysis. From the results of fatigue tests and analysis, the relationships between film parameters and life adjustment factors were acquired. And it was turned out that so as to estimate the effect of moment load on fatigue life, the life adjustment factor as well as the dynamic equivalent load must be taken into account.