Coreless bead for tyre

B - Operations – Transporting – 60 – C

Patent

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Details

B60C 15/00 (2006.01) B60C 15/02 (2006.01) B60C 15/024 (2006.01) B60C 15/06 (2006.01)

Patent

CA 2374502

The invention concerns a tyre designed to be mounted on a rim whereof the edges comprise round-shaped rim attachments, including at least two beads (3) and a reinforced casing (1) formed by at least one ply of reinforcing elements. Each bead (3) is coreless and said reinforced casing (1) has in each bead (3) a curved meridian profile viewed axially and radially inwards from outwards to form an axially inner ridge located in an angle .alpha. opening axially and radially inwards, said reinforced casing (1) being in each bead (3) reinforced at least radially outward and axially inward, by at least a first additional continuous layer (6), formed with inextensible circumferential reinforcing elements, and by at least a second continuous additional layer (7), formed with inextensible radial reinforcing elements, the two additional layers having profiles substantially parallel to the meridian profile of the reinforced casing in the bead.

Pneumatique destiné à être monté sur une jante dont les rebords ont des crochets de jante arrondis, comprenant au moins deux bourrelets (3) et une armature de carcasse (1) formée d'au moins une nappe d'éléments de renforcement. Chaque bourrelet (3) est dépourvu de tringle et ladite armature de carcasse (1) a dans chaque bourrelet (3) un profil méridien courbé en allant axialement et radialement de l'extérieur à l'intérieur pour former un bord axialement intérieur localisé dans un angle .alpha. ouvert axialement et radialement vers l'intérieur, ladite armature de carcasse (1) étant dans chaque bourrelet (3) au moins radialement à l'extérieur et axialement à l'intérieur renforcée, d'une part par au moins une première couche additionnelle (6) continue, formée d'éléments de renforcement inextensibles circonférentiels, et d'autre part par au moins une deuxième couche additionnelle (7) continue, formée d'éléments de renforcement inextensibles et radiaux, les deux couches additionnelles ayant des profils méridiens sensiblement paralllèles au profil méridien d'armature de carcasse dans le bourrelet.

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