Crown ply reinforcement for heavy vehicle tyre

Details Crown ply reinforcement for heavy vehicle tyre Crown ply reinforcement for heavy vehicle tyre

B - Operations, Transporting

60

C

B60C 9/22 (2006.01) B60C 9/18 (2006.01) B60C 9/20 (2006.01)

Patent

CA 2308037

The invention concerns a tyre (P) with radial body ply reinforcement (1) with maximum axial width S0, comprising a crown ply reinforcement (3) formed of at least two working breaker strips (32, 34) of inextensible reinforcing elements, criss-crossed from one breaker strip to the other forming with the circumferential direction angles between 10 DEG and 45 DEG , said breaker strips having axial widths L32, L34 not less than 80 % of the width S0, and, radially arranged between said working breaker strips, an additional breaker (33) made of reinforcing elements substantially parallel to the circumferential direction, the working breaker strips (32, 34) of widths L32, L34 greater than the width L33 of the additional breaker (33) by at least 16 % of the width S0, being on either side of the equatorial plane and in the immediate axial extension of the additional breaker (33) coupled over an axial distance l not less than 3 % of the width S0, to be then separated by a section (4) of rubber mixture with a thickness not less than 2 mm.

Pneumatique (P) à armature de carcasse radiale (1) de largeur axiale maximale S0, comprenant une armature de somment (3) formée d'au moins deux nappes de sommet de travail (32, 34) d'éléments de renforcement inextensibles, croisés d'une nappe à l'autre en faisant avec la direction circonférentielle des angles compris entre 10° et 45°, lesdites nappes ayant des largeurs axiales L32, L34 au moins égales à 80 % de la largeur S0, et, disposée radialement entre lesdites nappes de travail, d'une nappe additionnelle (33) d'éléments de renforcement sensiblement parallèles à la direction circonférentielle, les nappes de travail (32, 34) de largeurs L32, L34 supérieures à la largeur L33 de la nappe additionnelle (33) d'au moins 16 % de la largeur S0, étant de part et d'autre du plan équatorial et dans le prolongement axial immédiat de la nappe additionnelle (33) couplées sur une distance axiale 1 au moins égale à 3 % de la largeur S0, pour être ensuite séparées par un profilé (4) de mélange de caoutchouc d'épaisseur au moins égale à 2 mm.

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