Title:
PNEUMATIC TIRE
Document Type and Number:
WIPO Patent Application WO/2022/030285
Kind Code:
A1
Abstract:
Provided is a pneumatic tire that has adequately reduced rolling resistance during high-speed travel as well as excellent durability performance. This pneumatic tire comprises a sidewall and a clinch section in each of a pair of side sections. If the loss tangent of the sidewall is tanδsw and the loss tangent of the clinch section is tanδc when measured at a temperature of 70°C, a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%, then (tanδsw + tanδc) ≤ 0.3 and |tanδsw − tanδc| ≤ 0.07. If the cross-sectional width of the tire is Wt (mm) and the external diameter is Dt (mm) when the pneumatic tire is assembled with a regulation rim and internal pressure is set to 250 kPa, and if the volume of space occupied by the tire is a virtual volume V (mm3), then Formula 1 and Formula 2 are satisfied. Formula 1: 1700 ≤ (Dt2 × π/4) / Wt ≤ 2827.4; Formula 2: [(V + 1.5 × 107) / Wt] ≤ 2.88 × 105
Inventors:
HAMAMURA KENJI (JP)
KAWAI HIROKI (JP)
TOYA SUBARU (JP)
KAWAI HIROKI (JP)
TOYA SUBARU (JP)
Application Number:
PCT/JP2021/027586
Publication Date:
February 10, 2022
Filing Date:
July 26, 2021
Export Citation:
Assignee:
SUMITOMO RUBBER IND (JP)
International Classes:
B60C13/00; B60C3/04; B60C15/06; C08L9/00
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Other References:
TOA, SYNTHETIC RESEARCH ANNUAL REPORT TREND, no. 3, 2000, pages 42 - 45
Attorney, Agent or Firm:
JODAI Tetsuji et al. (JP)
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