Patent ID: 6779574
Filing Date: 2004-08-24
Classification: B60C,Y10T

Abstract:
A tire with radial carcass reinforcement having beads with a heel portion on an axially inner side and a toe portion on an axially outer side, comprising:at least one bead wire coated with a rubber mix; at least one bead filler formed of a rubber mix disposed axially outward and radially outward of the bead wire; a wedge formed of a rubber mix disposed axially outward of the at least one bead wire and radially inward of the at least one bead filler, the wedge defined by two sides extending from an apex located radially beneath the section of the at least one bead wire, a radially outer side of the wedge defining, with a reference line parallel to the axis of rotation of the tire and passing through the apex, a first acute angle &phgr;1 open radially outside, and a radially inner side forming with said reference line a second acute angle &phgr;2, open radially toward the inside, the rubber mix having a Shore A hardness of at least 65 and being greater than the Shore A hardness of the rubber mix forming the at least one bead filler; a first radial reinforcement ply wound on said at least one bead wire to form a first upturn, wherein, when viewed in meridian section, the reinforcement ply is wound about said bead wire passing from the heel toward the toe of said at least one bead, the first upturn engaging the radially outer side the wedge; and, a second radial reinforcement ply wound on said at least one bead wire, wherein, when viewed in meridian section, the second reinforcement ply is disposed in parallel to the first radial reinforcement ply in a sidewall area of the tire and is wound about said bead wire passing from the heel toward the toe of said at least one bead with a second upturn engaging the radial inner side of the wedge.