| 摘要 |
PURPOSE:To improve durability, strength, and performance and lighten a tire in a heavy-load light truck by using aliphatic polyamide fiber with a high strength above a defined value as a carcass cord and confining the occupation ratio of rubber on a defined area surrounding the cord in a fixed range. CONSTITUTION:A heat treated carcass cord of a high-strength nylon cord having a strength of 10g/d or more is used and the rubber occupation ratio SRi of the inside ply of tire and the rubber occupation ratio SRo of the outside ply of tire on a defined area surround one cord in a carcass part are set to satisfy specific formulas I respectively. By this structure, a tire can be made lighter while improving durability, breakage strength, and tire performance. |
