Rubber pneumatic tyre - with modulus of carcass rubber lower than modulus of sidewall and inner core rubber to prevent tyre detachment

摘要

In the pneumatic vehicle tyre, of rubber -type plastics, the modulus of the carcass rubber is significantly less, at least in the sidewall section of the tyre, than the modulus of the side wall rubber and the modulus of the rubber of the inner core. The stretch-to-break value of the carcass rubber is at least as high as that of the sidewall rubber (13) and the inner core (10). The value of the carcass rubber modulus is about 50% of the sidewall rubber, with a carcass rubber module of equal to or less than 3 N/mm2 (at 300% stretch) against a modulus of 4-6N/mm2 for the sidewall rubber (13) and the inner core (10). The stretch-to-break of the carcass rubber is greater than 700% compared with 600%+/-50% for the rubber of the sidewall and the inner core. ADVANTAGE - The structure prevents the tyre cords from becoming detached.