B - Operations – Transporting – 60 – C
Patent
B - Operations, Transporting
60
C
B60C 15/06 (2006.01)
Patent
CA 2488008
The invention concerns a tyre for vehicles transporting heavy loads comprising, in at least one bead (1) an additional reinforcement (1) consisting of a plurality of discontinuous reinforcing elements (920, 921, 922), said discontinuous reinforcing elements being of substantially circumferential orientation to form a plurality of circles (C, C1, C2) concentric to the axis of rotation of the tyre mounted on its rim, each circle being defined by a mean radius (R, R1, R2) measured relative to said axis of rotation. Said tyre is characterized in that: each discontinuous reinforcing element (920) of length L0 located on a circle C of radius R is mechanically coupled over coupling lengths (L11) and (L12) with two discontinuous reinforcing elements (921) located on a circle C1 of radius R1, circle immediately adjacent to the circle C, the coupling length L11 ranging between 10 and 25 % of L0; each discontinuous reinforcing element of the same circle C of radius R is mechanically coupled over coupling lengths (L21) and (L22) with two discontinuous reinforcing elements (922) located on a circle C2 of radius R2 immediately adjacent to the circle C1, the coupling length L21 ranging between 15 to 35 % of L0 and the coupling length L22 ranging between 50 to 70 % of L0.
Pneumatique pour véhicules portant de lourdes charges comprenant, dans au moins un bourrelet (1) une armature supplémentaire de renforcement (9) composée dune pluralité de renforts discontinue (920, 921, 922), ces renforts discontinue étant orientés sensiblement circonférentiellement pour former une pluralité de cercles C, C l, C2 concentriques à 1'axe de rotation du pneumatique monté sur sa jante, chaque cercle étant défini par un rayon moyen (R, R1, R2) mesuré par rapport audit axe de rotation, ce pneumatique étant caractérisé en ce que: .bullet. chaque renfort (920) discontinu de longueur LO situé sur un cercle C de rayon R est couplé mécaniquement sur des longueurs de couplage L 11 et L 12 avec deux renforts discontinus (921) situés sur un cercle C1 de rayon R1, cercle immédiatement adjacent au cercle C, la longueur de couplage L11 étant comprise entre 55 ä 70% de LO et la longueur de couplage L12 étant comprise entre 10 à 25% de LO ; .bullet. chaque renfort (920) discontinu du même cercle C de rayon R est couplé mécaniquement sur des longueurs de couplage L21 et L22 avec deux renforts discontinus (922) situés sur un cercle C2 de rayon R2 immédiatement adjacent au cercle C1, la longueur de couplage L21 étant comprise entre 15 ä 35% de LO et la longueur de couplage L22 étant comprise entre 50 ä70% de L0.
Durif Pierre
Gervais Philippe
Sallaz Gilles
Michelin Recherche Et Technique S.a.
Robic
LandOfFree
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