Patent ID: 6997617

Claim:
A roller bearing comprising: an inner ring having a rolling contact surface on an outer circumferential face thereof; an outer ring having a rolling contact surface on an inner circumferential face thereof, the rolling contact surface of the outer ring opposed to the rolling contact surface of the inner ring; a plurality of cylindrical rollers each provided for free rolling between the rolling contact surface of the inner ring and the rolling contact surface of the outer ring, and each including an end face having a peripheral part that is crowned; and a flange portion formed at an outer circumferential face end part of the inner ring and/or an inner circumferential face end part of the outer ring; wherein the peripheral part is crowned in a curving shape represented by an exponential function of y=a ·exp(− b·x ) where a and b are constants, x is a distance from the rolling contact surface in a radial direction of the cylindrical roller, and y is a crowning fall-off amount from a central part of the end face of the cylindrical roller in an axial direction of the cylindrical roller.