Tire with breaker ply extending between bead regions
AssigneeSumitomo Rubber Industries, Ltd.
InventorsMichael Raymond Corner, David Robert Watkins
Life of this patent
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Abstract
A pneumatic radial tire having in axial cross-section a highly curved tread is reinforced by a breaker assembly with improved resistance to breaker edge looseness. The breaker assembly includes one breaker ply which extends between two bead regions and has its edges disposed between a carcass main portion and a carcass turn-up portion. An improved single-stage method may be employed for building the tire.
Claims10
A radial pneumatic tire comprising a tread reinforced by a breaker assembly comprising at least two breaker plies having cords, the tire having in its normally inflated fitted condition a camber value C/L, defined as the ratio of the radial distance C to the axial distance L between the tread center and the tread edge, of between 0.3 and 0.7, the tire further comprising a reinforcing carcass ply having cords disposed at an angle of 70° to 90° to the tire circumferential direction, the carcass ply extending radially in side the breaker plies and between two bead regions to form a carcass main portion and wrapped in each bead region axially outwardly around an annular bead core to form carcass ply turn-up portions extending radially outwardly and terminating radially inward of the point of maximum tire width, wherein the radially outermost breaker ply extends between the two bead regions, and the edges of the radially outermost breaker ply are disposed between the carcass main portion and the respective turn-up portion in the bead region.
Dependencies are inferred from the claim text.