Static carrying capacity of a single-row ball slewing bearing taking into account drive transmission conditions

Problems of computing a slewing bearings static carrying capacity have been presented in the paper. Particularly it was concentrated on determination of static limited load curves which include axial forces, radial forces and tilting moments. A calculation were performed on the base of single-row ball slewing bearing with four-point contact zone. In this work a procedure of determining the static limiting load curves on the basis of modeling by using the finite element method (FEM), analytic Eschmann's formulas and classical mechanics equations have been described. The structure of FEM bearings’ model was considered with gear conditions between a toothed bearing’s ring (rim) and a drive pinion in a power train of the excavator F250H symbol. Moreover, in the model flexibility of: the bearing rings, a contact zone ball-bearing, support structure and mutual interactions between bolts clamping the bearing rings and the support structures were taken into account. The static carrying capacity of the analyzed bearing, considered with the pinion and without was compared. Quantitative assessment of loads of the contact zones ball-raceway was achieved by using a statistic criterion.