Reinforcing belt structure for pneumatic tire

摘要

An asymmetric reinforcement belt structure (24) for a pneumatic tire (10) is disclosed. The reinforcing structure includes an outer belt (26) and inner belt (28), each reinforced with a plurality of generally parallel cords (30,32). The outer belt has a first portion (74) between the centerlines of the cords and a first surface (86) and a second portion (76) between the centerlines of the cords and a second surface (88). The first portion has a thickness T1 which is between 110% and 150% of T2. Similarly, the inner belt (28) has a third portion (78) and a fourth portion (80), with the third portion being between the centerlines of the cords and a third surface (90) and a the fourth portion being between the centerlines of the cords and a fourth surface (92). The fourth portion has a thickness T4 which is between 50% and 90% of a thickness of the third portion T3. Orienting the cords within the belts in this way separates them slightly more than would be so if the belts were symmetrical. This additional separation reduces the conicity of the tire.