Tire bead for heavy civil engineering vehicle

摘要

Technique for improving the endurance of beads of a radial tire for a heavy vehicle of the civil engineering type, by blocking the cracks that are initiated in the carcass reinforcement upturn end zone and that are propagated in the surrounding polymer materials, causing the deterioration of the bead over time. A binding element (23), having at least two layers of binding including reinforcement elements made of textile material, is in continuous contact with the carcass reinforcement upturn (211) between a first point of contact (A2) on the axially inner face (211a) of carcass reinforcement upturn, corresponding to a first end (I2) of the binding element, and a last point of contact (B2) on the axially outer face (211b) of the carcass reinforcement upturn.

主权项

1. A tire for a heavy vehicle of the civil engineering type comprising:
a tread; a sidewall extending radially inwards from an end of said tread; a bead extending said sidewall radially inwards, said bead comprising a bead wire core; and a carcass reinforcement comprising at least one carcass reinforcement layer having metal reinforcement elements wound in said bead, from the inside to the outside of the tire, around said bead wire core, in order to form a carcass reinforcement upturn extending radially outwards to a carcass reinforcement upturn end, said carcass reinforcement upturn comprising an axially inner face and an axially outer face, wherein a binding element, having at least two binding layers comprised of reinforcement elements made of textile material, is in continuous contact with said carcass reinforcement upturn between a first point of contact on said axially inner face of said carcass reinforcement upturn, corresponding to a first end of said binding element, and a last point of contact on said axially outer face of carcass reinforcement upturn, and wherein: a portion of said binding element that includes a second end of said binding element extends axially inside a radial axis passing through the center of the bead wire core, the portion of said binding element extends axially inside the last point of contact, and the portion of said binding element is not in contact with said axially outer face of said carcass reinforcement upturn.