| 摘要 |
<p>Provided is a run-flat tire that achieves high levels of both run-flat durability and ride comfort, and minimizes weight increase. In a sidewall-reinforced run-flat tire, the minimum thickness section being positioned between the belt layer end section and the tire cross-sectional height (SH) 70% position, the relationship between the thickness (Gmin) of the minimum-thickness section and the thickness (Gmax) of the maximum thickness section (17) is defined as 0.5 × Gmax≤Gmin≤0.8 × Gmax; the relationship between the length (Lmin) of the thin region and the tire cross-sectional height (SH) is defined as 0.18 × SH≤Lmin≤0.26 × SH; the relationship between the weight (Wr) of the sidewall-reinforcement layer, the tire total weight (Wt), and the tire oblateness (R) is defined as 0.08 × Wt × (1 - 0.2 × (1 - R/50))≤Wr≤0.18 × Wt × (1 - 0.2 × (1 - R/50)); the relationship between the thickness (Ga) at the rim-check line of the outer-side rubber portion outward of the carcass layer, and the maximum thickness (Gb) thereof, is defined as 0.8 × Gb≤Ga≤1.0 × Gb; and the relationship between the thickness (Gc) at the rim-check line of the inner-side rubber portion inward of the carcass layer and the thickness (Ga) is defined as 0.7 × Ga≤Gc≤1.0 × Ga.</p> |
