PROBLEM TO BE SOLVED: To improve both of turning performance and wear resistance of a center part 27.SOLUTION: Since a reinforcement cord, which constitutes a belt layer 24, is configured from a cord having a low elastic modulus (a tensile force of less than 15 N at the time of elongation by 1%), a circumferential shear force of a tread 26 is lowered, and as a result, a value of wear energy becomes small, and wear resistance of the tread 26 is improved. Further, tanδ of a shoulder part 28 is so made as to be larger than tanδ of a center part 27, and consequently, a grip limit at the shoulder part 28, which grounds during turning, is enhanced, thereby improving turning performance.
【課題】旋回性能とセンター部27における耐摩耗性とを共に向上させる。【解決手段】ベルト層24を構成する補強コードを低弾性率( 1%伸長時の引張力が15N以下)のコードから構成したので、トレッド26の周方向剪断力が低下すし、この結果、摩耗エネルギーの値が小さくなり、トレッド26(センター部27)の耐摩耗性が向上する。しかも、ショルダー部28の tanδをセンター部27の tanδより大としたので、旋回時に接地するショルダー部28でのグリップ限界が高くなり、旋回性能が向上する。【選択図】図1
TIRE FOR TWO-WHEELED MOTOR VEHICLE
自動二輪車用タイヤ
2015-07-30
Patent
Electronic Resource
Japanese
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