Bridgestone Corporation

Shu Nagai

Naoya Ochi

Yukihiro Kiwaki

Shungo Fujita

Takayuki Fukunaga

Fumio Takahashi

Takaaki Kojima

Kensuke Dobashi

Soutarou Iwabuchi

Takanari Saguchi

Shu Fujiwara

A pneumatic tire comprises a tread provided with at least two circumferential main grooves and a rib defined in a tread central portion by the circumferential main grooves, wherein an auxiliary groove is formed in the tread central portion, the auxiliary groove having a circumferential groove portion extending in a tire equator direction and an axial groove portion extending from an end of the circumferential groove portion in such a manner that the axial groove portion is bent at an acute angle to the circumferential groove portion, and at least an end of the auxiliary groove is open into the circumferential main groove.

Pneumatic tire with tread having chamfered circumferential groove portion of bent auxiliary groove

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

Growing community of inventors

Sayama, Japan

Shu Nagai