To provide a heavy-duty pneumatic tire which is superior in wet traction performance and abrasion resistance.SOLUTION: The cap tread rubber in a heavy-duty pneumatic tire comprises: diene-based rubber containing natural rubber and butadiene rubber; and a reinforcement filler. In the diene-based rubber 100 pts.mass, a proportion of the butadiene rubber is 30-50 pts.mass. A blended amount of the reinforcement filler is 40-70 pts.mass relative to the diene-based rubber 100 pts.mass. In the reinforcement filler, carbon black with a nitrogen adsorption specific surface area (N2SA) of 100 m2/g or more accounts for 75 mass% or more. Further, in the heavy-duty pneumatic tire, a ratio of a storage elastic modulus (E'cap) at 0°C of the cap tread rubber, to a storage elastic modulus (E'RC) at 60°C of the rim cushion rubber satisfies 1.0≤(E'cap)/(E'RC)≤2.0.SELECTED DRAWING: Figure 1

    【課題】優れたウェットトラクション性および耐摩耗性を有する重荷重用空気入りタイヤを提供する。【解決手段】キャップトレッドゴムが、天然ゴムおよびブタジエンゴムを含有するジエン系ゴムと補強性充填剤とを含み、ジエン系ゴム100質量部中、ブタジエンゴムの割合が30〜50質量部であり、ジエン系ゴム100質量部に対し、補強性充填剤の配合量が40〜70質量部であり、前記補強性充填剤中、窒素吸着比表面積(N2SA)が100m2/g以上のカーボンブラックが75質量%以上を占め、かつキャップトレッドゴムの0℃における貯蔵弾性率(E’cap)と、リムクッションゴムの60℃における貯蔵弾性率(E’RC)との比が1.0≦(E’cap)/(E’RC)≦2.0を満たす重荷重用空気入りタイヤ。【選択図】図1


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    Title :

    HEAVY-DUTY PNEUMATIC TIRE


    Additional title:

    重荷重用空気入りタイヤ


    Contributors:

    Publication date :

    2021-03-11


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60C VEHICLE TYRES , Fahrzeugreifen



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