Title:
PNEUMATIC TIRE
Document Type and Number:
WIPO Patent Application WO/2021/200132
Kind Code:
A1
Abstract:
Provided is a pneumatic tire in which the rolling resistance coefficient is reduced while maintaining steering stability. In a ground contact region defined by a pair of shoulder main grooves 10B located on both outermost sides of a tread portion 1 in the tire width direction, a total gauge TOGa of a cap tread rubber 11A and an under tread rubber 11B and a gauge UTGa of the under tread rubber 11B satisfy the relationship of 0.20 ≤ UTGa/TOGa ≤ 0.40, the hardness UTHs of the under tread rubber 11B is in the range of 62-67 (inclusive), the hardness UTHs of the under tread rubber 11B and the hardness CapHs of the cap tread rubber 11A satisfy the relationship of 0.90 ≤ CapHs/UTHs ≤ 1.20, and the tanδ (60°C) of the under tread rubber 11B is 0.06 or less.
Inventors:
NAKAZAKI KEISUKE (JP)
Application Number:
PCT/JP2021/010707
Publication Date:
October 07, 2021
Filing Date:
March 16, 2021
Export Citation:
Assignee:
YOKOHAMA RUBBER CO LTD (JP)
International Classes:
B60C11/00; B60C1/00
Domestic Patent References:
| WO2018206873A1 | 2018-11-15 |
Foreign References:
| JP2007137411A | 2007-06-07 | |||
| JP2019199136A | 2019-11-21 | |||
| JP2006213193A | 2006-08-17 | |||
| JPS6061313A | 1985-04-09 | |||
| JP2003291610A | 2003-10-15 | |||
| JP2003326917A | 2003-11-19 | |||
| JP2006062518A | 2006-03-09 | |||
| JP2007284554A | 2007-11-01 | |||
| JP2002079807A | 2002-03-19 | |||
| JP2004059740A | 2004-02-26 | |||
| US20160016435A1 | 2016-01-21 |
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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