Title:
RUN-FLAT TIRE
Document Type and Number:
Japanese Patent JP2022157677
Kind Code:
A
Abstract:
To provide a run-flat tire that suppresses decrease of run-flat durability.SOLUTION: A run-flat tire according to the present invention includes a tread part, a sidewall part, a bead part, a side reinforcing rubber, and a carcass, and has an inner liner arranged on an inner surface of the tire, and an inner-layer rubber arranged between the side reinforcing rubber and the inner liner. The inner layer rubber is structured such that the number of repetitions until a test piece breaks is more than twice that of the side reinforcing rubber in a range between 10% and 30% of a given tension strain when the inner layer rubber is subjected to repeated tension at a frequency of 10 Hz under a condition of 150°C, using the test piece in which the center of a No. 8 dumbbell is notched 1 mm perpendicularly to a direction of the repeated tension in accordance with JIS K6270, and in a reference state, a ratio t2/t1 is 0.05-0.30.SELECTED DRAWING: Figure 1
Inventors:
MUKOUYAMA TOMONAO
Application Number:
JP2021062035A
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