| 摘要 |
PROBLEM TO BE SOLVED: To provide technique for improving bead CBU durability in a tire using a bead core formed by using a bead wire which has a polygonal cross section. ! SOLUTION: The tire comprises a carcass 2 as a skeleton and extending between a pair of toes of bead 11 in a toroidal state, and being folded back from inside toward outside of the tire around bead cores 1 embedded in the pair of toes of bead respectively. In the tire, the bead cores have a polygonal cross section by being formed of a bead wire having a polygonal cross section. In addition, on the cross section of the bead core, a corner 21c of the tire inner surface side in the polygonal cross section of the bead wire 21C forming a side opposing to the carcass in the tire inner surface side is chamfered into an arc shape. ! COPYRIGHT: (C)2014,JPO&INPIT |
