| 摘要 |
PURPOSE:To make improvements in high-speed durability, by dividing a belt being installed for strengthening a tread part of a radial-ply tire for aircraft or the like into a first group of cord setup substantially paralleled with a tire equatorial surface and a second group of cord setup to be tilted to the equatorial surface. CONSTITUTION:A belt 2 consisting of cords surrounding a crown part of a carcass 1 and forming a parallel set up with each other is divided into a first group alpha (a line-up belt layer) of plural layers forming a cord setup substantially paralleled with an equatorial surface of a tire and a second group beta (a crossed belt layer) forming the cord setup tilted at an angle of 15 deg.-65 deg. to the tire equatorial surface. At least one piece among belt layers of the first group alphais set to setup width larger than 1.10 times of grounding width of a tread part 7. And, the belt layer of the second group beta is pressed in between layers of any of plies of the carcass 1 and the belt layers of the first group alpha or the belt layers of the second group beta, and it should be set to such setup width as being not exceeding this grounding width W and the setup width of belt layers of the adjacent first group alpha. |
