Invention Application
- Patent Title: PNEUMATIC TIRE
- Patent Title (中): 气动轮胎
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Application No.: US12907544Application Date: 2010-10-19
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Publication No.: US20110094639A1Publication Date: 2011-04-28
- Inventor: Yasujirou Daisho
- Applicant: Yasujirou Daisho
- Assignee: The Yokohama Rubber Co., Ltd.
- Current Assignee: The Yokohama Rubber Co., Ltd.
- Priority: JP2009-247978 20091028
- Main IPC: B60C11/00
- IPC: B60C11/00

Abstract:
A pneumatic tire includes at least two types of cap tread rubber layers made from differing rubber compositions disposed in a tread portion. A tan δ at 60° C. of a rubber composition forming the cap tread rubber layer on a vehicle outer side is greater than a tan δ at 60° C. of a rubber composition forming the cap tread rubber layer on a vehicle inner side. A ratio (tan δH/tan δL) of a maximum tan δH to a minimum tan δL at 60° C. of the tan δ of the rubber compositions forming the at least two types of cap tread rubber layers is from 1.05 to 1.80. An under tread rubber layer disposed in the tread portion has an average thickness from 0.8 mm to 4.0 mm. A hardness of a rubber composition forming the under tread rubber layer is from 73 to 83. A tan δ at 60° C. of the rubber composition forming the under tread rubber layer is 0.25 or less.
Public/Granted literature
- US08256478B2 Pneumatic tire Public/Granted day:2012-09-04
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