Pneumatic tire
AssigneeToyo Tire & Rubber Co., Ltd.
InventorMasaaki Ohara
Life of this patent
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Abstract
A pneumatic tire of the invention includes: a stepped-shaped raised area provided in the main groove positioned at a center area of the tire so as to be continued circumferentially of the tire, connected to either the main groove walls, and raised from the groove bottom; and a ridge lower than a tread surface of the tire in each of the main grooves on both outsides of the main groove at the center area of the tire so as to be raised from the center of the groove bottom continuously along the length thereof without being joined with the groove walls, and the angle of inclination of the main groove walls with respect to the normal line of the tangential line on the tread surface of the main groove portion is parallel to each other or is 5° or smaller.
Claims6
A pneumatic tire having a plurality of linear main grooves continuing circumferentially of the tire and a plurality of linear ribs formed by being partitioned by the main grooves on a tread thereof, comprising:
- a raised area provided in the main groove positioned at a center area of the tire so as to continue circumferentially of the tire, the raised areas being joined to either the groove walls of the main groove and being raised from the groove bottom to form a stepped shape;
- a ridge lower than a tread surface of the tire is provided in each of the main grooves positioned on both outsides of the main groove at the center area of the tire so as to be raised from the center portion of the groove bottom continuously along the length thereof without being joined with the groove walls,
- wherein the angle of inclination of the groove walls of the main grooves with respect to the normal line of the tangential line drawn on the tread surface of the main groove portion is parallel to each other or is 5° or smaller in the direction to reduce the width of the grooves of the main grooves on the radially inside of the tire.
Dependencies are inferred from the claim text.