| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pneumatic tire for heavy load with improved cut-resistance capability, the resistance to damage such as cuts or bored holes and so forth brought into birth on a belt layer due to protuberances of obtuse and acute angles on the road surface during a travel on the rough forging and so forth. <P>SOLUTION: The pneumatic tire for heavy load is composed of a tread section 11, side wall sections 12 and a bead section 13, and is equipped with a carcass 2 reinforcing these sections, and a belt layer 3 arranged on the outer periphery of the carcass and comprised of 6 layers reinforcing the tread section. When the belt layer of six layers are shown, from the innermost layer in sequence, as a first to sixth belt layer, the first belt layer and second belt layer are made of the same belt material, while the third belt layer and fourth belt layer are made of the same belt material. The angle formed by the third and fourth belt layers to the tire's circumferential direction is larger than the angle formed by the first and second belt layers to the tire's circumferential direction, and the ratio of the strength of the first and second belt layers against that of the third and fourth belt layers is 0.7 or more. <P>COPYRIGHT: (C)2009,JPO&INPIT |
