Bridgestone Corporation

Yoshiki Nakata

Kohei Suzuki

Mayuko Karasawa

Keisuke Kawashima

A tire includes a first circumferential main grooveand a second circumferential main groovein a tread surface. A resonatoris formed in an intermediate land portionpartitioned between the first circumferential main groove and the second circumferential main groove. The resonator has an auxiliary groovewhose both ends terminate within the intermediate land portion. The groove depths Dof the first and second circumferential main grooves are 50% or less of the groove widths Wof the first and second circumferential main grooves, respectively. The groove depth Dof the auxiliary groove of the resonator is 70% or more of the groove depth Dof the first circumferential main groove.

Tire

Provided is pneumatic tire in which a land portion includes a width direction sipe extending in a tread width direction, the width direction sipe includes, in a cross section along a depth direction, a linear portion extending from an opening of the width direction sipe toward a bottom of the width direction sipe, and a bent portion connected to the linear portion, bending and extending from a connecting portion with the linear portion to the bottom of the width direction sipe, and the linear portion of the width direction sipe has a length in the depth direction increasing as the linear portion extends from a center portion of the width direction sipe in the tread width direction toward an end portion in the tread width direction.

Pneumatic tire

On the surface of a tread portion (), one central main groove () extends in a tire circumferential direction (C) at a pattern center, and a pair of outer main grooves () extend in the tire circumferential direction (C) each at a position between the central main groove () and a respective one of two tread ends (). The central main groove () and the outer main grooves () define central land portions (), and the outer main grooves () and the tread ends () define outer land portions (). Among the central land portions () and the outer land portions (), first circumferential narrow grooves () are provided only in the central land portions (), extend in the tire circumferential direction (C), have a narrower opening width and a shallower depth than those of the central main groove (), and have a first groove wall () on the side of the outer main groove () and a second groove wall () on the side of the central main groove () such that an intersection angle () between a tread surface () and the first groove wall () is larger than an intersection angle () between the tread surface () and the second groove wall ().

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Tokyo, Japan

Yoshiki Nakata