| 摘要 |
PROBLEM TO BE SOLVED: To maintain operational stability by strongly securing tightness between a carcass ply and a bead core to reduce the loosing of the tension of a carcass code during vulcanization molding. SOLUTION: The carcass ply 6A comprises a band of a main ply 10 and a folded ply 11. The main ply 10 extends from a tread 2 to the outer edge S1a of the radial outer surface S1 of the bead core 5 in the tire axis direction. The folded ply 11 passes through the outer surface S1, inner surface S2, inner surface S3, and outer surface S4 of the bead core 5 and extends outward in the radial direction in contact with the outer surface of the main ply 10 in the tire axis direction. Bead apex rubber 8 has a trigonal cross section with a bottom Q1 fixed to the outer surface S1 of the bead core 5 via the carcass ply 6A, a rising side Q2 continuing to the outer edge Q1a of the bottom Q1 and rising in contact with the main ply 10, and a sloped side Q3. COPYRIGHT: (C)2004,JPO&NCIPI
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