| 摘要 |
PURPOSE:To aim at reduction in the number of edge parts and improve durability, by rolling up a carcass at a bead part none side in a way of turning up if from the inside to the outside around a bead wire bundle, and constituting the rolled up end to be led into the extent of a bead pat on the other. CONSTITUTION:In case of a pneumatic tire where two carcasses 1 are installed between a symmetrical pair of bead parts 4 and 4, the carcass 1 is rolled up in a way of turning it up from the tire inside to the outside at a bead part on one side around the bead wire bundle 2. And the edge part (a) extends as far as a lower part of the bead wire bundle 2 of the bead part on the other, and it is made so as to be rolled down. With the above-mentioned carcass structure, the number of the edge part (a) of the carcass 1 is reducible to half as compared with the conventional structure one without entailing any drop in carcass strength of a tire, thus trouble frequencies attributable to the edge part (a) as an origin are sharply reducible.
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