Radial tire

Abstract

Abstract PURPOSE:To improve the high-speed durability and the steering stability by forming a cap band having a prescribed width by means of using a high modulus, low thermal shrinkage factor, modified nylon 66 in parallel to the equatorial plane of a tire. CONSTITUTION:A modified nylon 66, with the sum of the dry thermal shrinkage factor for 30min at 180 deg.C and the intermediate elongation under 2.25g/d being from 5 to 12% and with the strength greater than 7.0g/d, is laid in parallel to the equatorial plane of a tire, and a cap band 8, whose width is greater than 90% of the maximum width of a belt layer 4, is formed in direct contact with a ply 4b laid radially outmost of the belt layer, which is inserted between the ply 4b and the tread section so as to envelop this ply 4b along the circumferential direction. By using such a modified nylon 66 for a cap band, improvements can be made on the thermal and dimensional stabilities of the cords as well as on the tire uniformity, high-speed durability, and steering stability.

Inventors

• 👤 Ritsuo Nakayasu
• 👤 中安　律夫

Bibliographic Details