CAJ | 학술논문

根据脂润滑轴承失效表现形式，分析了滚动轴承沟道表面缺陷产生的原因，建立了球－沟道表面缺陷条件下的脂润滑弹流数学模型和油膜厚度方程，采用数值计算方法分析了不同尺寸的表面缺陷及表面光滑条件下的脂润滑弹流润滑油膜压力和油膜厚度分布规律。结果表明：轴承工作过程中，球－沟道表面会形成位置、尺寸和形状随机分布的凸起和凹坑；相比于光滑表面，缺陷表面会引起油膜压力和油膜厚度显著变化，且对于同类型表面缺陷，随着缺陷尺寸的增大，引起油膜压力和油膜厚度分布变化的规律大致相同但效果增强；表面缺陷均会对轴承润滑脂的润滑效果造成不良影响。
근거지윤활축승실효표현형식，분석료곤동축승구도표면결함산생적원인，건립료구－구도표면결함조건하적지윤활탄류수학모형화유막후도방정，채용수치계산방법분석료불동척촌적표면결함급표면광활조건하적지윤활탄류윤활유막압력화유막후도분포규률。결과표명：축승공작과정중，구－구도표면회형성위치、척촌화형상수궤분포적철기화요갱；상비우광활표면，결함표면회인기유막압력화유막후도현저변화，차대우동류형표면결함，수착결함척촌적증대，인기유막압력화유막후도분포변화적규률대치상동단효과증강；표면결함균회대축승윤활지적윤활효과조성불량영향。
According to failure form of grease lubricated bearings,the reasons are analyzed for raceway surface defects of rolling bearings.The mathematical model of elastohydrodynamic lubrication (EHL)and film thickness equation are established for grease -lubricated ball bearings having balls and raceway surface with defects,the distribution rules of film pressure and thickness for surface with defects of different size and smooth surface are analyzed by numerical calcu-lation methods.The results show that random surface pits and protuberances with different location,size and shape are generated on balls and raceway surface during bearing operation.Compared with smooth surface,a noticeable change for film pressure and thickness is caused by defective surface.For same type of surface defect,the varying pattern for distribution of film pressure and thickness are similar,but the effect is improved with the increase of defect size.The surface defect has harmful effects on lubricating performance of grease for bearings.