Bridgestone Corporation

Mayuko Karasawa

Kai Yamada

Shungo Fujita

Kohei Sahashi

Yoshiki Nakata

Keiichi Hanami

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

A pneumatic tire including a center block rowprovided in a center area of a tread surface, wherein the center block row includes a plurality of center blocksarranged along a tire circumferential direction, the plurality of center blocks includes a plurality of first center blocksand a plurality of second center blocks, the plurality of first center blocks and the plurality of second center blocks have polygonal shapes on the tread surface, the polygonal shape formed by each second center block has a same number of sides as, but a different shape than, the polygonal shape formed by each first center block, each first center block and each second center block has one or more sipes, and a number n of sipes included in each second center block is greater than a number m of sipes included in each first center block.

Pneumatic tire

Provided in this disclosure is a tire with a meandering groove extending along tire circumferential direction formed on a tread surface, wherein the meandering groove has a groove width in tire width direction that varies at a predetermined repetitive cycle along the tire circumferential direction, ratio of the maximum and minimum widths of the groove width, Wmin/Wmax, is 0.35 to 0.85, a first groove wall and a second groove wall, which are both groove walls of the meandering groove, meander and extend in a sinusoidal manner with the predetermined repetition cycle as one cycle length in a tread surface view, and in the tread surface view, a first sinusoidal curve formed by the first groove wall and a second sinusoidal curve formed by the second groove wall are arranged with a phase difference of ⅛ to ⅜ cycle in the tire circumferential direction.

A pneumatic tire that includes a tread surfaceincluding: two or more main grooves; and a pair of middle block rows, wherein one or more first middle blocks in the plurality of middle blocks each have a middle block inclined side wall surfacethat faces an outer main groove in the pair of outer main grooves and that gradually inclines inwards in a tire radial direction as the middle block inclined side wall surface extends outwards in the tire width direction, and the middle block inclined side wall surface forms an acute angle θof 30° to 50° with respect to a normal of the tread surface at an inner end in the tire width direction of the middle block inclined side wall surface.

Growing community of inventors

Tokyo, Japan

Mayuko Karasawa