HEAVY LOAD TIRE AND MANUFACTURING METHOD OF HEAVY LOAD TIRE

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HEAVY LOAD TIRE AND MANUFACTURING METHOD OF HEAVY LOAD TIRE

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KITANO TETSUYA

To provide a heavy load tire 2 which can be reduced in weight and can achieve improvement of SFC resistance.SOLUTION: In a meridian cross section of a tire 2, a contour CL of a carcass 12 has: a curved portion 44 expanded outward; and a reverse curved portion 46 which is provided at radial inside of the curved portion 44 and dents inward. The reverse curved portion 46 is connected to the curved portion 44. A boundary between the curved portion 44 and the reverse curved portion 46 is a flexion point PV. A part or whole of the curved portion 44 is expressed by a first arc including the flexion point PV. A part or whole of the reverse curved portion 46 is expressed by a second arc including the flexion point. The first and second arcs come in contact with each other at the flexion point PV. A side surface 48 of the tire 2 has; a recessed portion 50 which hollows inward; an outside portion 52 which is located at radial outside of the recessed portion 50; and an inside portion 54 which is located at radial inside of the recessed portion 50. The recessed portion 50 is located at radial outside of the flexion point PV.SELECTED DRAWING: Figure 5

【課題】本発明の目的は、軽量化を図りながら、耐ＳＦＣ性能の向上を達成できる、重荷重用タイヤ２の提供。【解決手段】このタイヤ２の子午線断面において、カーカス１２の輪郭ＣＬは、外向きに膨らむ湾曲部４４と、湾曲部４４の径方向内側に位置し内向きに窪む逆湾曲部４６とを備える。逆湾曲部４６は湾曲部４４に連なる。湾曲部４４と逆湾曲部４６との境界は変曲点ＰＶである。湾曲部４４の一部又は全部は、変曲点ＰＶを含む第一の円弧で表される。逆湾曲部４６の一部又は全部は、変曲点ＰＶを含む第二の円弧で表される。第一の円弧と第二の円弧とは変曲点ＰＶにおいて接する。タイヤ２の側面４８は、内向きに窪む凹部５０と、凹部５０の径方向外側に位置する外側部５２と、凹部５０の径方向内側に位置する内側部５４とを備える。凹部５０は変曲点ＰＶの径方向外側に位置する。【選択図】図５