Pneumatic radial tires

B - Operations – Transporting – 60 – C

Patent

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152/85.1

B60C 9/16 (2006.01) B60C 9/00 (2006.01) B60C 9/20 (2006.01) D07B 1/06 (2006.01)

Patent

CA 2016915

A pneumatic radial tire for truck and bus comprises a carcass ply containing cords arranged substantially in a radial direction of the tire and a belt superimposed about said carcass ply and comprised of plural belt layers each containing steel cords arranged at a cord angle of 5-20° with respect to an equator of the tire. In this case, the steel cord for the belt layer has a two-layer structure of a core comprised of two steel filaments and a single sheath comprised of 6-8 steel filaments and satisfies the particularly relationships on filament diameter, twisting pitch, bending rigidity, tensile strength and distance between adjoining cords.

Un pneu radial pour camion et autobus est constitué d'un pli de carcasse contenant des cordes disposées substantiellement dans un sens radial du pneu et une ceinture superposée sur ledit pli de carcasse et constituée de couches de ceinture multiples contenant chacune des cordes d'acier placées à un angle de 5-20.degrés. par rapport à l'équateur du pneu. Dans le présent cas, la corde d'acier pour la couche de ceinture a une âme à structure bicouche constituée de deux filaments d'acier et une gaine simple constituée de 6-8 filaments d'acier et elle satisfait aux rapports particuliers réalisés en ce qui touche le diamètre des filaments, le pas de torsion, la rigidité de courbure, la résistance à la rupture et la distance entre les cordes.

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