Runflat tire with improved carcass

B - Operations – Transporting – 60 – C

Patent

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Details

B60C 17/00 (2006.01) B60C 9/08 (2006.01) B60C 9/14 (2006.01) B60C 9/18 (2006.01) B60C 9/20 (2006.01) B60C 9/22 (2006.01) B60C 11/00 (2006.01) B60C 15/00 (2006.01) B60C 15/04 (2006.01)

Patent

CA 2291224

A runflat radial ply pneumatic tire (10) having a carcass (30) which has a pair of sidewalls (20), each sidewall being reinforced with at least two sidewall fillers or inserts (42, 46) and at least two cord reinforced plies (38, 40) and a bead core (26). The carcass has one or more reinforcing belts (36). Each sidewall has at least one ply (38 or 40) reinforced with cords, the cords have a modulus E of X, X being at least 10 GPa. At least one ply has a turnup end (32) wrapped around the bead core (26). A second ply (38 or 40) is reinforced with substantially inextensible cords having a modulus E greater than X of the cords of the other ply. The second ply (38 or 40) is spaced from the first ply (38 or 40) by the second filler or insert in the sidewall (20).

L'invention porte sur un pneumatique radial (10) pouvant rouler dégonflé présentant: une carcasse renforcée (30) par au moins deux éléments (42, 46) de remplissage ou d'insertion placés dans les flancs, au moins deux plis (38, 40) renforcé par des câbles, un corps de talon (26) et une ou plusieurs ceintures de renfort (36). Chacun des flancs comporte au moins un pli (38 ou 40) dont les câbles de renfort ont un module E de X, X représentant au moins 10GPa. L'extrémité relevée (32) d'un au moins des plis est enroulée autour du corps de talon (26). Un deuxième pli (38 ou 40) est renforcé par des câbles sensiblement inextensibles dont le module E est supérieur à la valeur X du câble de l'autre pli. Le deuxième pli (38 ou 40) est séparé du premier par le deuxième élément de remplissage ou d'insertion placé dans le flanc (20).

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