Title:
RUN-FLAT TIRE
Document Type and Number:
Japanese Patent JP2022157673
Kind Code:
A
Abstract:
To provide a run-flat tire that suppresses decrease of ride comfort while ensuring run-flat durability.SOLUTION: A run-flat tire according to the present invention includes: a crescent-shaped cross-sectional side reinforcing rubber 6 disposed on a sidewall 2; and a carcass 4 toroidally shaped in a bead part 3. A part 6b of the side reinforcing rubber is a low elasticity part with a lower elastic modulus than the other part 6a, the low-elasticity part is equipped with a run-flat tire 10 on the applicable rim, the low-elasticity portion is located in a tire radial region of 50% or more and 80% or less of the tire cross-sectional height from a bead base line in a reference state in which a specified internal pressure is filled and no load is applied, and the elastic modulus of the low elastic part is less than 80% of the elastic modulus of the other part. When in the cross section in a tire width direction in the reference state, the maximum thickness of the low elasticity part when measured in a direction of the perpendicular line drawn down from the carcass to the inner surface of the tire is a maximum thickness t1, and the thickness of the other part when measured in the direction of the perpendicular ls t2, the ratio t1/t2 is 0.2 or more and 3 or less.SELECTED DRAWING: Figure 1
Inventors:
MATSUKI KOSUKE
Application Number:
JP2021062030A
Publication Date:
October 14, 2022
Filing Date:
March 31, 2021
Export Citation:
Assignee:
BRIDGESTONE CORP
International Classes:
B60C17/00; B60C5/14
Attorney, Agent or Firm:
Kenji Sugimura
Mitsutsugu Sugimura
Yasuyuki Komatsu
Yusuke Yamaguchi
Mitsutsugu Sugimura
Yasuyuki Komatsu
Yusuke Yamaguchi
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