PNEUMATIC RADIAL TIRES FOR HEAVY VEHICLES

摘要

A pneumatic radial tire for heavy vehicles is disclosed. This tire comprises a carcass composed of at least one ply of cords arranged in a substantially radial plane inclusive of the rotary axis of the tire with a turnup portion thereof, and a plurality of reinforcing layers for bead portion each containing cords crossed with the cords of the carcass ply. Among these reinforcing layers, reinforcing layers having heights which are different in radially upward end as measured from a reference line parallel to the rotary axis of the tire passing through the center of a bead core toward the radial direction of the tire and having cords with substantially the same modulus of elasticity are crossed with each other such that the cords of the reinforcing layer are inclined at a larger angle with respect to the radial plane of the tire as the height of the radially upward end becomes lower.