Patent ID: 6131632
Filing Date: 2000-10-17
Classification: B60C,Y10T

Abstract:
A heavy duty radial tire having an aspect ratio of not more than 80% , comprising:a carcass comprising a ply of cords arranged at an angle of from 70 to 90 degrees with respect to the tire equator;a belt comprising three plies of parallel cords disposed radially outside the carcass, the three plies including a first radially innermost ply, a second ply and a third ply which are disposed in this order from the radially inside to the outside;said second ply being widest in the three belt plies and the axial width BW thereof being in the range of from 1.00 to 2.00 times the section height H of the tire;a first rubber thickness d1 defined as the minimum distance from the cords at the axially outer end of the first belt ply to the cords of the carcass being in the range of from 1.0 to 5.0 mm;an second rubber thickness d2 defined as the minimum distance from the cords at the axially outer end of the third belt ply to the cords of the second belt ply being more than said first rubber thickness d1;an axial distance W1 of the axially outer end of the first belt ply from the axially outer end of the second belt ply and an axial distance W2 of the axially outer end of the third belt ply from the axially outer end of the second belt ply satisfying the following condition: 0<=W1-W2<=5.0 mm; anda cushion rubber disposed between the first belt ply and the carcass so as to provide said first rubber thickness d1, said cushion rubber tapering axially inwardly so as to have an axially inner end at an axial distance W0 of 10.0 to 25.0 mm from the axially outer end of the first belt ply.