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: A pneumatic tire T includes, in a tread 14, a pair of circumferential grooves 34 which are located at an interval in a tire width direction WD with a tire equator plane Cl interposed therebetween. In an unloaded state that the tire is rim-assembled to a normal rim and an internal pressure of 30kPa is charged therein, 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. 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 recess, which is formed in the tire width direction midship part of a contour line of the 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 in the pair of circumferential grooves 34.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】本発明の空気入りタイヤTは、トレッド14にタイヤ赤道面CLを挟んでタイヤ幅方向WDに間隔をあけて配置された一対の周方向溝34を備え、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む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、タイヤ幅方向断面におけるトレッド14の輪郭線のタイヤ幅方向中央部に形成される凹みのタイヤ幅方向両端45が、一対の周方向溝34に位置する。【選択図】 図1
PNEUMATIC TIRE, PNEUMATIC TIRE MANUFACTURING METHOD, AND TIRE VULCANIZATION DIE
空気入りタイヤ、空気入りタイヤの製造方法、及びタイヤ加硫金型
2021-08-10
Patent
Electronic Resource
Japanese
IPC: | B60C VEHICLE TYRES , Fahrzeugreifen |
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