| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce the weight of a tire while ensuring bead durability. <P>SOLUTION: An inner apex part 11 forms an L-shaped cross section comprising a bottom piece part 11a along an outer surface in a tire radial direction of a bead core 5; and a standing piece part 11b extending from an inner end in a tire axial direction of the bottom piece part 11a to an outer side in a tire radial direction along a standing body part 6a and terminated at an outer side in the tire radial direction than an outer end 6be in the tire radial direction of a folded/returned part 6b. Thickness t3 of the standing piece part 11b is gradually reduced toward the outer side in the tire radial direction. A cord reinforcement layer 9 of an approximately L-shaped cross section is provided on the bead part 4, comprising: an inner piece part 9a extending to an inner side in the tire radial direction of the bead core 5; and an outer piece part 9b having an outer end 9be continued to the inner piece part, extending to the outer side in the tire radial direction along an outer side surface in the tire axial direction of the folded/returned part 6b and terminated at an inner side than an outer end 6be of the folded/returned part 6b. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
