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Title:
PNEUMATIC TIRE
Document Type and Number:
Japanese Patent JP2013252840
Kind Code:
A
Abstract:

To provide a pneumatic tire capable of achieving both dry steering stability and snow steering stability.

A pneumatic tire 1 includes, in a tread portion, a plurality of circumferential main grooves 21 to 23 extending in a tire circumferential direction, and a plurality of land portions 31 to 24 partitioned by the circumferential main grooves 21 to 23. The land portions 31, 32 in an inner area and the land portions 33, 34 in an outer area have a plurality of sipes 312 to 342, respectively. Further, 90[%] or more of the sipes 312, 322 disposed in the inner area comprise two-dimensional sipes, and 90[%] or more of the sipes 332, 342 disposed in the outer area comprise three-dimensional sipes. A tread portion includes cap rubber 151 and under rubber 152. The rubber hardness H_cap at 20[°C] of the cap rubber 151 and the rubber hardness H_ut at 20[°C] of the under rubber 152 have a relationship of H_cap<H_ut.


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Inventors:
TSUNEKAWA DAIGEN
Application Number:
JP2012131242A
Publication Date:
December 19, 2013
Filing Date:
June 08, 2012
Export Citation:
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Assignee:
YOKOHAMA RUBBER CO LTD
International Classes:
B60C11/00; B60C5/00; B60C11/03; B60C11/11; B60C11/12
Domestic Patent References:
JP2005145191A2005-06-09
JP2007153056A2007-06-21
JP2007161123A2007-06-28
Foreign References:
WO2007097309A12007-08-30
WO2009053133A12009-04-30
Attorney, Agent or Firm:
Hiroaki Sakai
Jun Takamura