| 摘要 |
<p>A high speed radial tyre comprises a radial carcass turned up around bead cores, and a belt comprising two cross plies disposed between the carcass and a rubber tread, and under a standard condition in which the tyre is mounted on the scheduled rim and inflated to the scheduled pressure and not loaded, the effective belt width BW is in the range of 0.7 to 0.85 times the maximum tyre section width SW and more than the ground contacting width TW, where the effective belt width BW is the axial distance between the edges U of the part in which at least two cross plies exist, and the ground contacting width TW is the axial distance between two points B on the tyre face corresponding to the edges of a ground contacting area under a loaded condition in which the tyre is mounted on the scheduled rim and inflated to the scheduled pressure and loaded with the scheduled tyre load, and under the standard condition, the shoulder region D of the tyre profile extending axially outwardly and radially inwardly from the point B to a point C through a point E therebetween is formed by an arc having a single radius of curvature of a single radius R being not less than 0.15 times the maximum tyre section width SW, where the point C is positioned at the same radial height as the thickness centre of the belt at the above-mentioned edge U, and the point E is positioned at the same axial distance from the tyre equator A as the edge U.</p> |
