Radial tire

Abstract

Abstract PURPOSE:To control uneven expansion and obtain a radial tire with excellent high-speed durability and operational stability by using modified nylon 66, of high modulus and low coefficient of thermal contraction, for a cord of a band covering both end parts of the layer of belts. CONSTITUTION:A radial tire 1 is composed of a bead core 2, a toroidal carcass 3 with its end part extending as far as the central area of a side wall, the layer 4 of belts with cords slanting at a shallow angle and a bead apex rubber 5. A pair of bands 8 is arranged in direct contact with a radially outside ply 4b, which is in the radially outermost position of the layer 4 of the belts, and further circumferentially enclosing both end parts of said ply. The sum of coefficient of dry contraction for 30min at 180 deg.C and medium extension at 2.25g/d is below 12% and above 5% for a modified nylon 66 cord used for a band. Since said cord is used for the modified nylon 66 band, uneven pantagraphing of the cord of the layer of belts is brought under control.

Inventors

• 👤 Ritsuo Nakayasu
• 👤 中安　律夫

Bibliographic Details