Radial tire for passenger cars including folded band layer at th

Details Radial tire for passenger cars including folded band layer at th Radial tire for passenger cars including folded band layer at th

1988-06-17

1990-09-18

Ball, Michael W.

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

152529, 152536, 152538, B60C 300, B60C 928

Patent

active

049571516

ABSTRACT:
A radial tire for passenger cars, comprising: a pair of bead cores; a radial carcass ply, the edges of which are turned up around bead cores; a tread; a belt layer composed of at least two plies of steel cords; and band layers folded over at the edges of the belt layer to form an upper layer portion radially outside the belt layer and a lower layer portion radially inside the belt layer, wherein the band layers are composed of organic fiber cords inclined by 5 to 45 degrees to the circumferential direction of the tire. A gap distance G1 between the upper layer portions of the band layers is in a range of 35 to 65% of the width WB of the belt layer, and the width W2 of the lower layer portion is longer than the width W1 of the upper layer portion and their difference W2-W1 is in a range from 5 to 20 mm. Preferably, the surface of the tread, when the tire is inflated to 5% of the standard internal pressure, is composed of a pair of external arc portions with a radius of curvature (TR2) and an internal arc portion therebetween with a radius of curvature (TR1), and the ratio (TR2/TR1) thereof is in a range from 0.15 to 0.45 and furthermore each of the intersections P thereof is located between the axially inner edge of the lower layer portion and the axially outer edge of a duplicated portion in which the at least two steel cord plies of the belt layer duplicate with each other.

REFERENCES:
patent: 3985173 (1976-10-01), Masson
patent: 4184529 (1980-01-01), Boileau
patent: 4815511 (1989-03-01), Brayer et al.

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