Tyre with improved bead structure

B - Operations – Transporting – 60 – C

Patent

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Details

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

Patent

CA 2412868

The invention concerns a tyre (1) with radial carcass reinforcement (13) comprising, viewed in meridian cross-section, two beads (12) with generatrices sloping outwards, the turn-up (130) of said reinforcement (13) being formed by the lateral (30) and radially internal (32) sides of a profiled section (3) of rubber mixture with high Shore hardness in the form of a wedge, and having located axially outside a straight line P¿2? perpendicular to the axis of rotation and passing through the centre of gravity of the anchoring element (14) and axially inside and radially outside the straight line P¿1? passing through said centre of gravity and forming with the axis of rotation an angle ranging between 30· and 60·, at least one of the profiled sections (6, 7) of rubber mixtures, between the carcass reinforcement (13) and its turn-up (130) and radially above the annular element (14) and the wedge-shaped profiled section (3), having a Shore hardness at least equal to the hardness of the rubber mixture forming said profiled section (3), and the ratio e¿1?/e¿2?, of the thickness e¿1? between the carcass reinforcement turn-up (130) and the annular anchoring element (14) over the thickness e¿2? between the carcass reinforcement turn-up (130) and the bead outer wall, measured on the straight line P¿1? verifies the relationship 0.05 <= e¿1?/e¿2? <= 1Ø

Pneumatique (1) à armature de carcasse radiale (13) comprenant, vu en section méridienne, duex bourrelets (12) avec génératrices inclinées vers l'extérieur, le retournement (130) de ladite armature (13) étant formé par les côtés latéral (30) et radialement interne (32) d'un profilé (3) de mélange caoutchouteux de dureté Shore A élevée sous forme de coin, et possédant une extrémité située d'une part axialement à l'extérieur d'une droite P2 perpendiculaire à l'axe de rotation et passant par le centre de gravité de l'élément annulare d'ancrage (14)et d'autre part axialement à l'intérieur et radialement à l'extérieur de la droite P1 passant par ledit centre de gravité et faisant avec l'axe de rotation un angle compris entre 30~ et 60~, au moins l'un des profilés (6, 7) de mélanges caoutchouteux, entre l'armature de carcasse (13) et son retournement (130) et radialement au-dessus de 1 élément annulaire (14) et du profilé (3) en forme de coin, présentant une dureté Shore A au moins égale à la dureté du mélange caoutchouteux formant ledit profilé (3), et le rapport e1/e2, de l'épaisseur e1 entre le retournement (130) d'armature de carcasse et l'élément annulaire d'ancrage (14) sur l'épaisseur e2 entre le retournement (130) d'armature de carcasse et la paroi extérieure du bourrelet, mesurée sur la droite P1, satisfaisant à la relation 0,05<=e1/e2<=1,0.

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