| 摘要 |
PROBLEM TO BE SOLVED: To provide a roller bearing device allowing deflection of an axle and prolonging a service life of a bearing by suppressing increase of bearing pressure between rolling contact surfaces and raceway surfaces of the bearing supporting the axle. SOLUTION: In this roller bearing device 10, the axle 77 with wheels 76 provided on both ends is supported by a roller bearing 20 provided with an outer ring 21 provided with the raceway surface in an inner circumference, an inner ring 22 provided with the raceway surface in an outer circumference, and substantially cone shaped rolling elements 23 with rolling contact surfaces formed by recessed or protruding generatices and plurally arranged between the raceway surfaces. A center part of either one of the raceway surfaces or the rolling contact surfaces of the rolling elements is formed by a first generatix having a constant radius of curvature, and both end parts adjacent to the center part are formed by a second generatix having a radius of curvature separating from the other of the raceway surfaces or the rolling contact surfaces of the rolling elements. |
