To suppress occurrence of abnormal wear and noise, and to improve low fuel consumption performance and driving stability while suppressing decrease in high speed durability.SOLUTION: In a pneumatic radial tire T, a concave shape part, which is recessed to tire radial direction inward with respect to a tire width direction outer side over the whole circumference in a tire circumferential direction, is formed in a tire width direction midship part in an unloaded state that the tire is rim-assembled to a normal rim and an internal pressure of 30kPa is charged therein. The concave shape part, which is formed in the tire width direction midship part in the unloaded state that the tire is rim-assembled to the normal rim and the internal pressure of 30kPa is charged therein, becomes a shape expanded to tire radial direction outward with respect to the tire width direction outer side in an unloaded state that the tire is rim-assembled to the normal rim and the internal pressure of 250kPa is charged therein. Tire width direction both ends 45 of the concave shape part 42, which is formed in the tire width direction midship part of a tread 14 in a tire width direction cross section in the unloaded state that the tire is rim-assembled to the normal rim and the internal pressure of 30kPa is charged therein, are positioned on the tire width direction outer side with respect to a ground contact end E in a state that the tire is rim-assembled to the normal rim, the internal pressure of 250kPa is charged therein, and a normal load is added thereto.SELECTED DRAWING: Figure 1

    【課題】異常摩耗やノイズの発生を抑え、高速耐久性の低下を抑えつつ低燃費性及び操縦安定性を向上させる。【解決手段】本発明の空気入りラジアルタイヤTは、正規リムにリム組みし30kPaの内圧を充填した無負荷状態において、タイヤ幅方向中央部がタイヤ周方向全周にわたってタイヤ幅方向外側よりタイヤ径方向内方へ凹形状部が形成され、正規リムにリム組みし30kPaの内圧を充填した無負荷状態において、タイヤ幅方向中央部に形成される前記凹形状部が、正規リムにリム組みし250kPaの内圧を充填した無負荷状態において、タイヤ幅方向外側よりタイヤ径方向外方へ膨らんだ形状となり、正規リムにリム組みし30kPaの内圧を充填した無負荷状態において、トレッド14のタイヤ幅方向中央部に形成される凹形状部42のタイヤ幅方向両端45が、正規リムにリム組みし250kPaの内圧を充填し正規荷重を加えた状態における接地端Eよりタイヤ幅方向外側に位置する。【選択図】 図1


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    Title :

    PNEUMATIC RADIAL TIRE, PNEUMATIC RADIAL TIRE MANUFACTURING METHOD, AND TIRE VULCANIZATION DIE


    Additional title:

    空気入りラジアルタイヤ、空気入りラジアルタイヤの製造方法、及びタイヤ加硫金型


    Contributors:
    TADA MASARU (author)

    Publication date :

    2021-08-10


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60C VEHICLE TYRES , Fahrzeugreifen / B29C Formen oder Verbinden von Kunststoffen , SHAPING OR JOINING OF PLASTICS



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