| 摘要 |
<p>A pneumatic tyre comprising a tread portion (2) having a pair of tread edges, a pair of axially spaced bead regions (4), a pair of sidewalls (3) extending between the tread edges and the bead regions (4), a bead core (5) disposed in each of the bead portions (4), a carcass (6) extending between the bead regions (4) and turned up around the bead cores (5), a rubber tread (17) disposed radially outside the crown portion of the carcass (6) defining the tread portion (2), and a belt (7) made of at least one spirally wound belt cord (11) disposed between the carcass (6) and the rubber tread (2), characterised in that said belt cord (11) comprises a high modulus strand (13A) and a low modulus strand (14A) twisted together, said high modulus strand (13A) being made of at least one continuous organic material filament (13) having a high elastic modulus, said low modulus strand (14A) being made of at least one continuous organic material filament (14) having a low elastic modulus, and in a unit length of said belt cord, the length (L1) of the high modulus filament (13) being in the range of 104 to 124 % of the length (L2) of the low modulus filament (14), each measured along the respective filament in an unloaded state. <IMAGE></p> |
