| 摘要 |
PURPOSE:To reduce the shearing stress of the shoulder of a tread, by increasing the distance between a carcass ply and a belt layer toward both the ends of the belt layer and setting a thickness ratio of 0.3 to 1.0 for the inner part ot outer part of the shoulder of the tread divided by the carcass ply. CONSTITUTION:The belt layer 2 is embedded in the tread 3 of a pneumatic tire 1. The carcass ply 4 of metal is embedded in the tread 3 and side parts 5. A wedge- shaped elastic piece 8 is provided in the shoulder 9 of the tread to couple the belt layer 2 qnd the carcass ply 4 to each other. The carcass ply 4 is so placed that the inside rubber of the tire is not broken and the surface strain of the shoulder of the tread does not increase. The increase in the surface strain would cause cracks or creases on the surface of the tire. |
