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US 2014/0150944 A1Published application
Pneumatic tire
AssigneeToyo Tire & Rubber Co., Ltd.
InventorKenichi Yamashita
Life of this patent
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Abstract
The invention provides a pneumatic tire which can reduce a rolling resistance while maintaining an wear resistance. Among a cap portion in a center area, at least the cap portion of a center land portion is provided with a cap front layer which includes a surface, and a cap inner layer which is laminated in an inner periphery of the cap front layer. A loss tangent of the cap front layer is set to be smaller than a loss tangent of the cap inner layer and be smaller than a loss tangent of the cap portions in the shoulder areas.
Claims5
A pneumatic tire comprising:
- a tread rubber;
- and
- a plurality of main grooves extending along a tire peripheral direction and provided in the tread rubber,
- wherein the tread rubber has a center area which is arranged between a pair of outer main grooves arranged in an outermost side in a tire width direction, and a pair of shoulder areas which are arranged in outer sides in the tire width direction of the outer main groove,
- wherein the center area has a center land portion which is zoned by the main groove and is positioned in a center portion in the tire width direction,
- wherein the tread rubber has a cap portion which constructs an outer layer, and a base portion which is laminated in an inner periphery of the cap portion and constructs an inner layer,
- wherein at least the cap portion of the center land portion among the cap portion in the center area has a cap front layer which includes a surface, and a cap inner layer which is laminated in an inner periphery of the cap front layer, and
- wherein a loss tangent of the cap front layer is set to be smaller than a loss tangent of the cap inner layer and be smaller than a loss tangent of the cap portions in the shoulder areas.
5 more elements
Dependencies are inferred from the claim text.