entrIn this article, minimum film thicknesses, contact areas, maximum contact pressures and total deformations of the rolling surfaces of cylindrical roller and deep groove ball bearings with three different radial loads are calculated and compared for three different material combinations. When radial loads are reduced by half, the minimum film thicknesses in the inner and outer contact areas are increased by approximately 9% in roller bearings and 5% in ball bearings, regardless of material pairs. In roller bearings with a constant load, the minimum film thicknesses were found to be constant independent of the material pair. In all-ceramic ball bearings, the minimum film thicknesses were found to be about 5% smaller than those of all-steel ones, almost independent of the load. In ball and roller bearings, the total deformations of the rolling surfaces are the largest in all-steel ones and the smallest in all-ceramic ones. Regardless of the combination of materials, it has been found that when the radial load is reduced by half, the total deformations in the ball bearings are reduced by about 37% and in the roller bearings by about 46%. The maximum pressures on the inner contact surface of ball bearings are reduced by approximately 21% and those of roller bearings by about 29%.
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