To provide a pneumatic radial tire capable of effectively reducing a road noise while favorably maintaining durability.SOLUTION: In a pneumatic radial tire comprising a tread 1, a pair of side walls 2 and a pair of beads 3, a carcass layer 4 is mounted between the pair of beads 3, 3; plural belt layers 7 are arranged at the outer peripheral side of the carcass layer 4 in the tread 1; and a belt cover layer 8 which includes plural organic fiber cords wound spirally at the outer peripheral side of the belt layer along a tire circumferential direction is arranged so as to cover the whole area of the belt layer 7. The organic fiber cord of the belt cover layer 8 is composed of a polyethylene terephthalate fiber cord in which an elastic modulus at 44 N load is in a range of 0.05 to 0.09 N/(tex.%), and the rectangular rate of a ground shape in the tread 1 is in a range of 0.85 to 0.98.SELECTED DRAWING: Figure 1

    【課題】耐久性を良好に維持しながら、ロードノイズを効果的に低減することを可能にした空気入りラジアルタイヤを提供する。【解決手段】トレッド部1と一対のサイドウォール部2と一対のビード部3とを備えると共に、一対のビード部3,3間にカーカス層4が装架され、トレッド部1におけるカーカス層4の外周側に複数層のベルト層7が配置され、該ベルト層の外周側にタイヤ周方向に沿って螺旋状に巻回された複数本の有機繊維コードを含むベルトカバー層8がベルト層7の全域を覆うように配置された空気入りラジアルタイヤにおいて、ベルトカバー層8の有機繊維コードは44N負荷時の弾性率が0.05N/(tex・%)〜0.09N/(tex・%)の範囲にあるポリエチレンテレフタレート繊維コードから構成され、トレッド部1の接地形状の矩形率が0.85〜0.98の範囲にある。【選択図】図1


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    Title :

    PNEUMATIC RADIAL TIRE


    Additional title:

    空気入りラジアルタイヤ


    Contributors:

    Publication date :

    2020-01-16


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60C VEHICLE TYRES , Fahrzeugreifen



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