| 摘要 |
<p>A tyre comprising a radial carcass (5), a tread (2) disposed radially outside the carcass (5), a belt (6) disposed radially outside the carcass and radially inside the tread (2) and a band (7) disposed radially outside the belt (6) wherein the band (7) has a ply composed of at least one hybrid cord wound spirally and continuously in the circumferential direction of the tyre at 0 to 3 degrees to the equator of the tyre, the hybrid cord (12) is composed of a high elastic modulus filament (10) and a low elastic modulus filament (11) which are twisted together, the hybrid cord (12) is provided with a low elastic modulus zone between zero elongation and a specific elongation of the cord and a high elastic modulus zone over the above mentioned specific elongation of the cord, and the specific elongation defining the transitional point (V) from the low elastic modulus zone to the high elastic modulus zone is in the range of 2 to 7% and further the ratio EH/EL of the elastic modulus EH in the high elastic modulus zone to the elastic modulus EL in the low elastic modulus zone is in the range of 2 to 10. The resultant tyre may be successfully vulcanised in a mould and then exhibits improved durability under high speed use.</p> |
