Bridgestone Corporation

Yugo Zuigyo

Masahiko Yamamoto

Yuji Yamaguchi

Osamu Saito

Tetsuhito Tsukagoshi

Daisuke Maehara

Hiroyuki Yokokura

Hidenobu Akahane

Masahiro Yamaguchi

This invention relates to a tire having an improved durability in the run-flat running without damaging the ride comfort in the usual running, and more particularly to a run-flat tire comprising a sidewall portion provided with a side reinforcing rubber layer having a crescent shape at section wherein a cord layer including a polyketone fiber cord satisfying the following conditions of the following equations (I) and (II):&#x3c3;&#x2267;&#x2212;0.01&#xd7;+1.2&#x2003;&#x2003;(I)&#x3c3;&#x2267;0.02&#x2003;&#x2003;(II)[wherein &#x3c3; is a thermal shrinkage stress at 177&#xb0; C. (cN/dtex) and E is an elastic modulus at 25&#xb0; C. under a load of 49 N (cN/dtex)] is disposed in at least a part of a region A ranging from a belt end to a maximum width part of a tire side portion and a region B ranging from a neighborhood of a bead core to a bead filler.

Run-flat tire

There is proposed a toric air bag for a safety tire capable of sufficiently and equally contacting with a full inner face of a tire in the expansion-deformation of the toric air bag by a drop of an internal pressure in the tire, wherein at least an expansion-deforming portion of the toric air bag having a hollow torus shape as a whole is constructed with a tension support member, and to the expansion-deforming portion is given a property indicating a characteristic of extension ratio-tensile force that tensile force per unit width is substantially and gradually increased with the increase of elongation through the expansion-deformation.

Safety tire with expansion-deforming toric air bag

Growing community of inventors

Kokubunji, Japan

Yugo Zuigyo