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本发明提供一种三角形加强层结构，它在不增加轮胎重量和不降低轮胎生产率的条件下，重载时防止胎圈位移或改善胎圈耐久性．此结构的胎体帘布层夹在靠近胎圈的两层加强层之间，胎体和两个加强层的钢丝帘线沿３个不同方向排列．第１层加强层距轮辋的径向距离Ｈ＿１为０．３～０．７Ｈ（Ｈ表示轮辋和轮胎最大断面宽之间的距离）；第２层加强层距轮辋的径向距离Ｈ＿２为０．２５～０．６Ｈ；Ｈ＿１和Ｈ＿２之间的径向距离Ｈ＿３≥０．０５Ｈ；两个加强层重叠部分的径向距离α≥０．１Ｈ．此外，两个加强层之间的重叠长度ｌ≥０．２５Ｌ（Ｌ￣①表示第１层加强层宽度）。
The present invention provides a triangular reinforcing layer structure which prevents bead displacement or improves bead durability under heavy load conditions without increasing tire weight and without lowering tire productivity. The carcass ply of this construction is sandwiched between two reinforcing layers close to the bead and the steel cord of the carcass and the two reinforcing layers are arranged in 3 different directions. The radial distance H_1 between the first reinforcement and the rim is 0.3 ~ 0.7H (H is the distance between the rim and the maximum width of the tire). The radial distance H 2 between the first reinforcement and the rim is zero. 25 ~ 0.6H; the radial distance between H_1 and H_2 is H_3≥0.05H; the radial distance between the overlapping parts of the two reinforcing layers is α≥0.1H. In addition, the length of the overlap between the two reinforcement layers is l ≥ 0.25L (L ~ ① indicates the width of the first reinforcement layer).