Patent ID: 6474384
Filing Date: 2002-11-05
Classification: B60C,Y10T

Abstract:
In a heavy duty pneumatic radial tire comprising; a carcass toroidally extending between a pair of bead portions and containing cords embedded substantially in a radial direction, a belt disposed on an outside of the carcass in the radial direction and a tread disposed on an outside of the belt in the radial direction, wherein the belt is comprised of four or more belt layers, cords of adjacent two belt layers among these layers are crossed with each other with respect to an equatorial plane of the tire, and when a main cross belt is constituted with a widest-width belt layer and a wider-width belt layer in two belt layers adjacent to the widest-width belt layer an inclination angle R of cords in a neighboring narrower-width belt layer arranged at an outside of the main cross belt in the belt radial direction and adjacent thereto with respect to an equatorial plane of the tire is made larger than an inclination angle H of cords in a belt layer arranged outward in the radial direction among the widest-width and wider-width belt layers, and an inclination angle N of cords in an innermost belt layer arranged inward in the radial direction is made within a range of 5-15Â° with respect to the equatorial plane of the tire.