Pneumatic radial tire

B - Operations – Transporting – 60 – C

Patent

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Details

B60C 11/117 (2006.01) B60C 11/04 (2006.01)

Patent

CA 2167192

A pneumatic radial tire in which only two wide straight main grooves are arranged on the left and right sides of an equator of the tire to define a region, which lies between these two main grooves, as a rib, lug grooves and/or sipes which extend in the widthwise direction of the tire being arranged in shoulder regions on the outer sides of the main grooves to form rows of blocks in which the blocks are lined in the circumferential direction of the tire, a distance a between the equator and an equator- side portion of a main groove and a width b of the main grooves being set in the following ranges with respect to a ground contact half-width W respectively of a tread surface. 0.10 ? a/W ? 0.38 0.17 ? b/W ? 0.25

L'invention concerne un pneu à carcasse radiale dont la surface de la bande de roulement ne comprend que deux rainures principales droites et larges, placées respectivement sur le côté gauche et sur le côté droit, par rapport à une ligne équatoriale. La zone comprise entre ces deux rainures principales forme une nervure, tandis que des rainures de relief et/ou des lamelles sont disposées en largeur dans les zones d'épaulement se trouvant à l'extérieur de la rainure principale respective, de façon à former une rangée de blocs s'étendant en continu dans le sens circonférentiel du pneu. Le rapport de la distance a séparant la ligne équatoriale d'une arête d'une rainure principale, située côté équateur, à la moitié W de la surface de la bande de roulement en contact avec le sol et le rapport de la largeur b d'une rainure principale à ladite moitié de largeur W ayant les valeurs suivantes: 0,10 <= a/W <= 0,38; 0,17 <= b/W <= 0,25.

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