Patent ID: 8979382
Filing Date: 2015-03-17
Classification: F16C

Abstract:
1. A rolling bearing comprising an outer race having a raceway, an inner race having a raceway, and rolling elements disposed between the raceways of the outer race and the inner race, wherein the inner race is formed with a bore through which a shaft can be fitted, wherein the bearing is designed and configured such that with the shaft fitted through the bore of the inner race, when a bearing load is applied between the outer race and the shaft and due to the bearing load, a peak load P is applied to the inner race from one of the rolling elements which receives a largest portion of the bearing load among the rolling elements, a first circumferential surface pressure distribution generated on the inner race by the one of the rolling elements circumferentially overlaps with each of second circumferential surface pressure distributions generated on the inner race by respective rolling elements circumferentially adjacent to the one of the rolling elements, and wherein the bearing is further designed and configured to satisfy one of below-identified first to third relations: first relation: where t is a minimum thickness of a portion of the inner race where the rolling elements contact the raceway of the inner race, in a direction perpendicular to the raceway of the inner race; and where Z is the number of the rolling elements; and SD is an inner diameter of the bearing; second relation: where σmid and σmax are minimum and maximum values, respectively, of a combined circumferential surface pressure distribution which is a combination of the first circumferential surface pressure distribution and the second circumferential pressure distributions; and third relation: where σ 2 is a surface pressure value applied to the inner race from the one of the rolling elements at a crossing point where a curve representing the first circumferential surface pressure distribution crosses a curve representing each of the second circumferential surface pressure distributions; and σ 1 is a maximum value of the first circumferential surface pressure distribution, and wherein σ where t is a minimum thickness of a portion of the inner race ( 2 ) where the rolling elements ( 3 ) contact the raceway ( 2 a ) of the inner race ( 2 ), in a direction perpendicular to the raceway ( 2 a ) of the inner race; where L is an axial effective contact length between the one of the rolling elements and the raceway of the inner race; Z is the number of the rolling elements; and SD is an inner diameter of the bearing.