| 摘要 |
PROBLEM TO BE SOLVED: To provide a bead core for a heavy load, pneumatic radial-ply tire capable of decreasing a ruptural failure due to fretting of a carcass code and a tire failure resulting from an air sump by heightening the adhesion of a carcass layer to the bead core. SOLUTION: The bead core 1 of the heavy load, pneumatic radial-ply tire consists of a bundle R of metal wires formed by winding a single metal wire S in layers in such a way that the arrangement pitch is dislocated at 1/2 intervals between the layers from the inner to the outer, wherein the section at least on the inside from the section center of the bead core 1 is shaped as consisting of a bottom edge member R1 parallel with the axial direction X of the bead core 1, intermediate side edge members R2 on the left and right perpendicular to the axial direction X, and diagonal members R3 and R4 in which the tangent angle of the two edge members tying the left and right intermediate side members R2 to the bottom edge member R1 is obtuse. COPYRIGHT: (C)2005,JPO&NCIPI
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