Composite of rubber and steel reinforcement, and pneumatic radial tire using the same in the belt

摘要

PROBLEM TO BE SOLVED: To provide a composite body consisting of rubber and steel cord which is used in a belt part of a pneumatic radial tire and the pneumatic radial tire which uses it. SOLUTION: This is a composite body used in a belt part of a radial tire. It is constituted in such a manner that steel cords C made of single filament or by intertwining a plurality of filaments are arranged in parallel, are covered with coating rubber, and are accumulated in two layers at a cross angle of 15 deg. to 30 deg. for an equatorial line of the tire to satisfy the conditions of a diameter (Ds) in the direction of arrangement of cords which constitute the belt part, a diameter (Dh) in the direction of accumulation, a cord interval (s), and gage between layers (H) to form the following equation (s/Ds)+(h/Dh)}=1.5.