| 摘要 |
The invention relates to improving the endurance of a bead of a radial tire for a heavy civil-engineering vehicle by reducing the return compressive stress of the ply turn-up during the rolling of the tire. According to the invention, for a tire for a heavy civil-engineering vehicle having two beads (1) which are to come into contact with a rim having two rim flanges (2), a carcass reinforcement including at least one casing reinforcement layer (3) having a main portion (31) wound around each bead (1) from the inside to the outside of the tire, surrounding a bead core (4) having a substantially circular meridional cross-section, so as to form a ply turn-up (32), a filling element (5) extending the bead core (4) radially outward and axially separating the main portion (31) and the ply turn-up (32), the distance (d) between a first portion of the ply turn-up (321) and the main portion (31) continuously decreasing radially inward from the core (4) up to a minimum distance (d |
