Bridgestone Corporation

Seiji Ishikawa

Fumio Takahashi

Toshiyuki Watanabe

Hidetoshi Yokota

Akio Kusano

Yoshiyuki Waki

Taiga Ishihara

Kento Hirohata

A pneumatic tire in which a cavity resonance sound is reduced while punctures are easily repaired with a puncture sealant. The pneumatic tire has a fibrous region where short fibers are bonded onto an inner surface of the tire. A circumferential fiberless region where short fibers are not bonded onto the inner surface of the tire extends circumferentially between both ends of a tread ground contact area.

Pneumatic tire

In a pneumatic tire provided on a groove surface with at least one main groove continuously extending in the circumferential direction of the tire, the air column resonance noise is effectively reduced without reducing the volume of the main groove, and the design flexibility is enhanced in consideration of the entire property of the tire. A pneumatic tire of the present invention is provided on a tread surfacewith a main groovecontinuously extending in the circumferential direction of the tire and a sub groovehaving two ends open to the common main grooveand a portion between the ends deviously extending in a common land portion, and characterized in that the sub grooveis configured to extend to be entirely included in a ground contact area of the tread when the tire mounted to an applicable rim is inflated with the maximum air pressure and is postured to be applied by a load corresponding to 80% of a defined mass.

A pneumatic tire is provided which has sufficient total properties and mass productivity of a tire without reducing drainage capability due to narrowed circumferential grooves, achieves high design flexibility of tread patterns and stiffness of land portion as intended, and also effectively reduces undesired air column resonance noise produced by the circumferential grooves. The pneumatic tire includes a circumferential groovewhich continuously and circumferentially extends in a straight line and arranged on a tread, and resonatorswhich are open to the circumferential grooveand terminate in a land portion, each of the resonatorsbeing configured with an air chamberopen toward a land portion surface, and a narrowed neckfor communication between the air chamberand the circumferential groove, and the narrowed neckhas the plane maximum width wwhich is within a range of from 3 to 50% of the plane maximum width wof the air chamber

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Kodaira, Japan

Seiji Ishikawa