Patent ID: 6821369
Filing Date: 2004-11-23
Classification: B60C,Y10T

Abstract:
A method of fabricating a radial tire, the method comprising:a) forming a cylindrical-shaped carcass ply comprising axially extending carcass reinforcing cords; b) fitting annular bead hoops onto a radially outer surface of the carcass ply and axially inward of each of the ply edges; c) assembling a plurality of breaker plies centrally onto and about the radially outer surface of the carcass ply, the breaker plies comprising a wide breaker ply which extends axially to a position inward of and adjacent to each of the bead hoops; d) turning each of the carcass ply edge portions lying axially outwardly of the bead hoops radially outwardly and axially inwardly around the bead hoops to overlie the axial edges of the wide breaker ply; e) assembling onto the cylindrical assembly of carcass plies, bead hoops and breaker plies, additional components of the tire, including a centrally disposed rubber tread flanked at either side by rubber sidewalls, to form a cylindrical green tire assembly; f) shaping the cylindrical green tire assembly into a toroid; and g) molding the cylindrical green tire assembly in a heated tire mould to form the tread pattern in the tread and vulcanize the molded assembly, wherein the radial bias angle of the carcass reinforcing cords in the vulcanized tire changes progressively from 90Â° in the regions of the bead hoops to as low as 70Â° in the central crown region.