Tread arcs for nonrotatable automobile and light truck tires

B - Operations – Transporting – 60 – C

Patent

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Details

B60C 11/00 (2006.01) B60C 19/00 (2006.01)

Patent

CA 2298444

A pneumatic radial tire combination for four-wheeled automobile or light truck vehicles. The tire combination has a pair of front steer position tires and a pair of rear position tires. The front steer position tire (10) has a first tread arc (46) when the tire is normally inflated for normal load but unloaded, of decreasing radii extending toward the lateral edges (42, 44) and a straight line (50) drawn between the intersection of the tread arc curvature and the centerplane is inclined at an angle .theta. F of greater than 5° relative to a tangent line L, L being tangent to the tread arc at the centerplane and parallel to the axis of rotation R. The rear tire (20) when similarly measured has a tread arc having an angle .theta.R of less than 5°.

L'invention porte sur une combinaison de bandages radiaux pneumatiques pour véhicules automobiles et utilitaires légers à quatre roues. Cette combinaison comporte une paire de pneus avant directionnels et une paire de pneus arrière. Le pneu avant directionnel (10) comporte un premier arc (46) de bande de roulement lorsque le pneu est normalement gonflé pour une charge normale, mais non sollicité en charge, ce premier arc ayant un rayon de courbure décroissant qui s'étend vers les bords latéraux (42, 44), et une ligne droite (50o) tracée entre l'intersection de la courbure de l'arc et le plan médian est inclinée selon un angle theta F supérieur à 5 DEG par rapport à une ligne tangente L, L étant tangent à l'arc de bande de roulement au niveau du plan médian et parallèle à l'axe de rotation R. Le pneu arrière (20), mesuré de manière similaire, présente un arc de bande de roulement selon un angle theta R inférieur à 5 DEG .

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