Annular concentric stranded bead cord, method for manufacturing the same, and vehicle tire

Abstract

There are provided an annular concentric stranded bead cord which can realize a reduction in weight while ensuring its strength, a method for manufacturing the same and a vehicle tire. The manufacturing method is a method for manufacturing an annular concentric stranded bead cord by forming a sheath layer by winding spirally a lateral wire round an annular core. After the sheath layer has been formed, the lateral wire is annealed in a pressure-reduced inactive gaseous atmosphere with an annealing quantity which exceeds a heating quantity (temperature×time) which is necessary for vulcanization of a vehicle tire with the annular concentric stranded bead cord embedded in a rubber of the vehicle tire when building the same and is shaped so that “Diameter shaping ratio (%)=H/D×100” becomes 20% or larger and 105% or smaller.

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