Bridgestone Corporation

Takanari Saguchi

Naoya Ochi

Yukihiro Kiwaki

Fumio Takahashi

Shu Nagai

Shu Fujiwara

The present invention provides a pneumatic tire having: a circumferential groove continuously extending in the tire circumferential direction in a ground contact surface of a tread portion; and a resonator provided in a land portion and constituted of a resonance cell portion opened to a ground contact region at a position distanced from the circumferential groove and a siping portion making the resonance cell portion communicate with the circumferential groove, wherein change in a tread pattern as time lapses can be alleviated without scarifying an effect of reducing pipe resonance sounds. Specifically, an opening width of the siping portion at the ground contact surface of the tread portion is designed to change in the longitudinal direction thereof such that the opening with is relatively narrow on the side of the circumferential groove and relatively wide on the side of the resonance cell portion.

Pneumatic tire

A pneumatic tire, in which at least one rib grooveextended in a tire circumferential direction is formed on a tread surface portion T of a tread portion, and portionsdiscontinuous in terms of rigidity are formed in a circumferential direction of rib lines B formed by the rib groove, the discontinuous portionscausing variations of tire axle force. Rigidity changing portionswhich cancel the variations of the tire axle force are provided in the rib groove, the variations being caused by the discontinuous portions. Thus, vibrational force to an axle is lowered, and pattern noise caused thereby is reduced effectively.

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Musashino, Japan

Takanari Saguchi