| 摘要 |
A heavy-duty pneumatic tire is provided to improve the stiffness in a bead part and extend life span by effectively removing stress generated between a carcass fly and a steel chafer. A heavy-duty pneumatic tire comprises a thread grounded on a road surface, a side wall for constituting a side surface of the pneumatic tire, a shoulder part for connecting two ends of the thread with the side wall, a bead part(1), an inner linear(7), and a carcass fly(3). The bead part connected to the shoulder part fixes the pneumatic tire to a rim. The inner linear positioned inside the pneumatic tire prevents leakage of air. The carcass fly is positioned at the outside of the inner linear. The bead part consists of a bead core(2), a triangular apex(6), a steel chafer(4) wrapping the carcass fly, and a reinforcement(8). The triangular apex positioned at the upper part of the bead core is wrapped with the bead core by the carcass fly. The reinforcement, whose two ends wrap the two ends of the steel chafer, is formed between the steel chafer and the carcass fly. The thickness of the reinforcement is 1mm to 3mm.
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