US 12,472,779 B2
Tire
Yoshiki Nakata, Tokyo (JP); and Mayuko Karasawa, Tokyo (JP)
Assigned to BRIDGESTONE CORPORATION, Tokyo (JP)
Appl. No. 17/997,040
Filed by BRIDGESTONE CORPORATION, Tokyo (JP)
PCT Filed May 6, 2021, PCT No. PCT/JP2021/017413
§ 371(c)(1), (2) Date Oct. 25, 2022,
PCT Pub. No. WO2021/225145, PCT Pub. Date Nov. 11, 2021.
Claims priority of application No. 2020-082604 (JP), filed on May 8, 2020; and application No. 2020-082611 (JP), filed on May 8, 2020.
Prior Publication US 2023/0173850 A1, Jun. 8, 2023
Int. Cl. B60C 11/13 (2006.01); B60C 11/03 (2006.01); B60C 11/12 (2006.01)
CPC B60C 11/13 (2013.01) [B60C 11/0302 (2013.01); B60C 11/0304 (2013.01); B60C 11/1218 (2013.01); B60C 11/1236 (2013.01); B60C 2011/0353 (2013.01); B60C 2011/0355 (2013.01); B60C 2011/0367 (2013.01); B60C 2011/1209 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A tire comprising a first circumferential main groove and a second circumferential main groove in a tread surface,
wherein
a resonator is formed in an intermediate land portion partitioned between the first circumferential main groove and the second circumferential main groove,
the resonator comprises: an auxiliary groove whose both ends terminate within the intermediate land portion; and a branch groove extending so as to connect between the auxiliary groove and the first circumferential main groove, the branch groove having a smaller groove cross-sectional area than the auxiliary groove,
groove depths D1 of the first and second circumferential main grooves are 50% or less of groove widths W2 of the first and second circumferential main grooves, respectively,
a groove depth D3 of the auxiliary groove of the resonator is 70% or more of the groove depth D1 of the first circumferential main groove,
the auxiliary groove of the resonator comprises:
a first auxiliary groove portion extending toward a first side in a tire circumferential direction, as being gradually farther from the first circumferential main groove; and
a second auxiliary groove portion extending from an end of the first auxiliary groove portion in the tire width direction on a side close to the first circumferential main groove and toward a second side opposite to the first side in the tire circumferential direction, as being gradually closer to the first circumferential main groove,
an acute angle-side inclination angle θ6 at an end of the second auxiliary groove portion, on a side connecting to the first auxiliary groove portion, with respect to a tire width direction is larger than an acute angle-side inclination angle θ4 at an end of the first auxiliary groove portion, on a side connecting to the second auxiliary groove portion, with respect to the tire width direction,
the branch groove of the resonator is connected to a connecting portion between the first auxiliary groove portion and the second auxiliary groove portion in the auxiliary groove of the resonator, and
the acute angle-side inclination angle θ6 is larger than an acute angle-side inclination angle θ2 at the end of the branch groove of the resonator, on a side far from the first circumferential main groove, with respect to the tire width direction.