| 摘要 |
A pneumatic tire equipped with an improved bead part is provided to prevent an apex part from being separated from a body ply and the bead part, and to improve riding comfort by forming a coupled part of bead cores and the apex part in polygonal shape. A pneumatic tire equipped with an improved bead part comprises a bead core(110), an apex part(130) and a bead part(100). The bead core is inserted by a plurality of bead wires(111). The apex part is installed in an upper surface of the bead core. The bead part includes a body ply(120) for supporting load as cord layers inside a tire. A coupled part of the bead core and the apex part is concave and polygonal, and shape of the apex part is convex and polygonal. The apex part includes a first apex(131) installed in an upper surface of the bead core and a second apex(132) installed in an upper surface of the first apex.
|
