Bridgestone Corporation

Seiji Itai

Takeshi Yano

Masaaki Nakamura

Hiroyuki Mori

The present invention provides a belt formed of a spirally wound strip member constituted of a few juxtaposed cords and rubber coating thereon, with a structure which can absorb influence of difference in winding diameter at the unit width portion of the strip member without deteriorating productivity of the tire. Specifically, the present invention provides a radial tire for use in aircraft, having a carcass including at least one layer of carcass ply extending in a troidal shape between a pair of bead cores, at least two layers of belt formed by spirally winding in a tire circumferential direction a strip member constituted of plural juxtaposed cords and rubber coating thereon, on the carcass on the outer side in the tire radial direction at a crown region of the carcass, and a tread rubber laminated on the belt, characterized in that: thickness and circumference of the belt decrease from the tire equatorial face toward end portions thereof in the widthwise direction; at least a belt portion corresponding to a tire shoulder portion, a boundary face between the belt layers and the tread rubber has a stepped configuration descending in the tire radial direction from the tire equatorial face toward the end portions thereof in the widthwise direction; and a boundary face between the belt and the carcass is a smooth curved face.

Radial tire for use in aircraft and method of producing the same

In the pneumatic radial tire of the present invention, a total strength Kof a belt layerin a circumferential direction of the tire per unit of width at a tire equator surface position Pis set greater than a total strength of the belt layerin the circumferential direction of the tire per unit of width at a width position Pcorresponding to &#x2154; of a maximum width of the belt layer having the tire equator surface CL as a center.

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Tachikawa, Japan

Seiji Itai