Tyre for heavy vehicles

Details Tyre for heavy vehicles Tyre for heavy vehicles

B - Operations, Transporting

60

C

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

Patent

CA 2611257

The invention concerns a tyre (41) with radial carcass reinforcement comprising a crown reinforcement (44) consisting of at least two working crown plies (441, 442) of inextensible reinforcing elements, crossed from one ply to the other forming with the circumferential direction angles ranging between 10° and 45°, itself capped with a running tread (45), the axially widest working crown ply being radially inside the other working crown plies. The tyre further comprises in each shoulder at least one layer (443) of radially oriented reinforcing elements, the axially inner end of said additional layer (443) being radially adjacent to the edge of the radially outer working crown ply (442), and at least part of said additional layer being adjacent the edge of the axially widest working crown ply (441), the ratio of the modulus of elasticity of one layer P over the module of elasticity of the liner layer of the working ply adjacent the additional layer ranging between 0.5 and 1, the axially outer end of said layer P being located axially between the ends of the axially narrowest and widest working crown plies

Pneumatique (41) à armature de carcasse radiale comprenant une armature de sommet (44) formée d'au moins deux couches de sommet de travail (441, 442) 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~, elle-même coiffée radialement d'une bande de roulement (45), la couche de sommet de travail axialement la plus large étant radialement intérieure aux autres couches de sommet de travail, le pneumatique comprenant additionnellement dans chaque épaule au moins une couche (443) d~éléments de renforcement orientés radialement, l~extrémité axialement intérieure de ladite couche additionnelle (443) étant radialement adjacente au bord de la couche de sommet de travail radialement extérieure (442), et au moins une partie de ladite couche additionnelle étant adjacente au bord de la couche de sommet de travail axialement la plus large (441), le rapport du module d~élasticité d'une couche P sur le module d~élasticité de la couche de calandrage de la couche de travail adjacente à la couche additionnelle étant compris entre 0.5 et 1, l~extrémité axialement extérieure de ladite couche P étant axialement entre les extrémités des couches de sommet de travail axialement les moins large et plus large.

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