Pneumatic radial tires for heavy vehicles

Claim 1

A reinforcing structure for bead sections of radial tires for heavy loads, comprising: at least one carcass ply having metallic cords in a substantially radial or a semi-radial arrangement and having a main portion and a turn-up portion which is turned around a bead core from the inside to the outside of the tire to a radial height of h 1 ; at least one reinforcing chafer of metallic cords arranged along and adjacent to the turn-up portion of the carcass ply and turned around said bead core in the same manner as said carcass ply turn-up portion, the axial outer end of said chafer extending to a radial height of h 2 on the axial outer side of the bead core, the perpendicular height of h 1 of the upper end of the turn-up portion of the carcass ply from the bead base being higher than the perpendicular height h 2 of the upper end of the metallic cord reinforcing chafer in the radial direction of the tire, the axial inner end of the reinforcing metallic cord chafer being disposed axially inwardly of the carcass ply and around the bead core to a position of a height h 4 axially inwardly of the bead core; and a carcass reinforcing member of metallic cords disposed solely along the axial inside of the carcass ply main portion, extending from a height h 3 in the radial direction from the bead base to a height h 5 to its inward end, of which a radial inward portion thereof is interposed between the carcass ply main portion and the inner turn-up portion of the metallic cord chafer, with the perpendicular height of h 3 being greater than h 4 and h 4 being greater than h 5 .