Effect of cylindrical micro-pit texture on the performance of misaligned radial journal bearing

Abstract

Abstract In order to study the influence of the circumferential distribution position, axial proportion, depth, inclined angle and area rate of cylindrical micro-pit texture on the lubrication and tribological performance of misaligned radial journal bearing, the mathematical model of friction lubrication of journal bearing is established based on the Reynolds equation, and the oil film pressure under the influence of different micro-pit texture parameters is solved iteratively by finite difference method, and the bearing load carrying capacity, friction force and end leakage of bearing under different texture parameters are calculated. The results are as follows: the bearing load carrying capacity is higher when the cylindrical micro-pit texture is distributed in the boost area and the axial ratio is around 55%; compared with smooth bearing, fully textured bearing and bucking zone micro-pit texture bearing, the coefficient of friction of journal bearing of the micro-pit texture in the boost area journal bearing is lower, and there exists an optimal axial proportion and depth of texture, which make the best friction and lubrication performance of the journal bearing; the micro-pit texture has the dual possibility of weakening and enhancing the bearing load carrying capacity, and the existence of the optimal circumferential and axial ratio, depth and inclined angle of the micro-pit texture make the bearing have higher load carrying capacity with less friction coefficient; the area ratio of cylindrical micro-pit texture is linearly correlated with bearing capacity and friction force; the smaller the degree of misalignment of the bearing, the more beneficial it is to improve the friction and lubrication performance of the bearing when machining suitable parameters of micro texture on the smooth bearing surface.