Invention Application
US20110094639A1 PNEUMATIC TIRE 有权
气动轮胎

PNEUMATIC TIRE
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.
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