ROLLER AND THRUST ROLLER BEARING

摘要

A full crowning formed on the outer diameter surface (13) of a roller (11) has a first crowning (14a), second crownings (14b), and third crownings (14c). When the length of the roller (11) in the direction of its rolling axis is not more than twice the radial length of the roller (11), the radius R1 of the curvature of the first crowning (14a) at a position apart by 32% of the length of the roller in its rolling axis direction from an end face (12a) of the roller (11) is from R551 to R1000, the radius R2 of the curvature of a second crowning (14b) at a position apart 23% of the length of the roller in its rolling axis direction from the end face (12a) of the roller (11) is from R321 to R550, and the radius R3 of curvature of a third crowning (14c) at a position apart 15% of the length of the roller in its rolling axis direction from the end face (12a) of the roller (11) is from R200 to R320.