| 摘要 |
PURPOSE:To prevent the split of the end parts of a belt by reducing the angle of a carcass layer under the belt-end edges of a tire for a heavy vehicle, restricting the deformation of the carcass layer near the belt-layer end parts during the rotation of said tire under load, and reducing the concentration of strain to take place at the belt-layer end parts. CONSTITUTION:When a tire is mounted on a standard rim and charged with a standard inside pressure, the angle phi of a carcass layer under a belt end edge is determined to be in the range of 0<=phi<=(57.5H/W-27.5) degrees. Therefore, the inversion point B of the curvature is made higher by varying the configuration of the cross section of stiffener rubber 10. The height HB of the inversion point B of curvature measured from the contact edge S between the flange of a rim 7 and the tire in the radially outer direction of the tire is preferably higher than 10% of the maximum height HP of the center line 1 of the carcass layer measured from said contact edge S in the radial direction of the tire. The modulus of tension of cushion rubber 9 is in the range of 20 to 40%, and that of tread rubber 6 is in the range of 20 to 45% of the modulus of tension of space rubber 8. The space rubber 8 wraps the end edges of belts 3, 4, and 5. |
