| 摘要 |
PURPOSE: A bead structure of a heavy duty tire is provided to improve bead durability by reinforcing a rotation restraining force with a rectangular cross section of a bead bundle, by relieving tension in a turn up edge unit of a carcass and by maximizing the volume of a bead filler. CONSTITUTION: A bead structure of a heavy duty tire comprises a bead bundle(1), a carcass(2), upper and lower bead fillers(3a,3b), a steel chafer(4), a nylon chafer(5), and elliptical nylon chafer(6). The bead bundle has a rectangular cross section. The carcass composes the frame of a tire by wrapping the bead bundle. The upper and lower bead fillers are located between a turn up edge(2a) of the carcass and the bead bundle. The steel chafer and the nylon chafer prevent the movement of the bead bundle by being connected to the carcass. The elliptical nylon chafer wraps a lower bead for increasing adhesive strength of both upper and lower beads and the durability thereof.
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