PROBLEM TO BE SOLVED: To provide a radial tire for a passenger car having ultra-fine steel cords for a carcass in which adhesive force between a carcass ply layer and a side wall or rim flange rubber adjacent to a turned-up outside and a stiffness of the rim flange rubber are larger than a bending stiffness of the carcass ply layer so as to improve durability performance of a bead part while reducing poor air inflow generated at a carcass turn up portion.SOLUTION: A pneumatic radial tire for a passenger car uses ultra fine steel cords having a wire diameter of 0.14 mm or less as a reinforcing material of a carcass ply. A bending force of the carcass ply (F) satisfies a relation equation 0
【課題】カーカスターンアップ部で生じる空気入りの不良を減らしながら、ビード部の耐久性能を改善できるようにカーカスプライ層とターンアップされた外側に隣接しているサイドウォールまたはリムフランジゴムとの粘着力とリムフランジゴムの剛性がカーカスプライ層の曲げ剛性に比べて大きくすることを目的とする。【解決手段】素線径が0.14mm以下の極細線を有するスチールコードをカーカスプライの補強材として使用する空気入りラジアルタイヤにおいて、前記カーカスプライのベンディング力(FP)は前記カーカスプライのターンアップの高さ(h)、リムフランジゴムの物性(MRF)及び厚さ(t)に対して、下記の関係式を満たす乗用車用空気入りラジアルタイヤ。0< FP< (0.025×h) + (MRF×t)【選択図】図1
RADIAL TIRE FOR PASSENGER CAR HAVING ULTRA FINE STEEL CORDS FOR CARCASS
カーカス用極細線スチールコードを有する乗用車用ラジアルタイヤ
2016-05-09
Patent
Electronic Resource
Japanese
Pneumatic radial tire for a passenger car having ultra fine steel cords for a carcass ply
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