乏油条件下圆柱滚子轴承的弹流润滑分析

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According to the theory of elastohydrodynamic lubrication（EHL） in finite line contacts ,taking the equivalent thickness of the oil-supply layer and relevant parameter of bearings as input data, a full numerical solution of the cylindri- cal roller bearings EHL under starved oil-supply condition was obtained. The lubrication performance between the fully- flooded and starved condition was compared, and the effects of the thickness of the oil-supply layer, the load, and the rota- ting speed on the lubrication performance of cylindrical roller bearings under starved condition were investigated. Results show that, as the oil-supply quantity decreases, the film thickness declines, the second pressure peak becomes lower and the pressure starting position moves towards the Hertzian contacting region. When the load increases, the film thickness gets thinner, which has disadvantage to the lubrication of bearings. The pressurized region becomes flatter and the film constric- tion moves towards the outlet zone with the increasing of the rotating speed, and the starved degree becomes more serious.基于有限长线接触弹流润滑理论，将等效供油层厚度和轴承相关参数作为输入量，求得乏油条件下圆柱滚子轴承弹流润滑的完全数值解；比较充分供油与乏油条件下轴承的润滑性能，研究乏油条件下供油层厚度、载荷、转速对圆柱滚子轴承润滑性能的影响。结果表明：随着供油量的减小，油膜厚度减小，第二压力峰降低，压力的起始点位置移向Hertz接触区；载荷增加，油膜厚度减小，这将对轴承的润滑产生十分不利的影响；随着转速的增加，压力区变得平坦，油膜颈缩向出口区移动，乏油程度更加严重。