Title:
RUN-FLAT TIRE
Document Type and Number:
WIPO Patent Application WO/2014/042035
Kind Code:
A1
Abstract:
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.
Inventors:
HORIUCHI KENJI (JP)
Application Number:
PCT/JP2013/073616
Publication Date:
March 20, 2014
Filing Date:
September 03, 2013
Export Citation:
Assignee:
YOKOHAMA RUBBER CO LTD (JP)
International Classes:
B60C17/00; B60C9/20; B60C13/00; B60C15/06; B60C1/00
Foreign References:
| JP2012162230A | 2012-08-30 | |||
| JP2012116212A | 2012-06-21 | |||
| JP2012071709A | 2012-04-12 | |||
| JP2011240895A | 2011-12-01 | |||
| JPS62279107A | 1987-12-04 |
Attorney, Agent or Firm:
Seiryu Patent Professional Corporation et al. (JP)
Clear stream international patent business corporation (JP)
Clear stream international patent business corporation (JP)
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