US 12,454,153 B2
Tire
Akinori Yokoyama, Tokyo (JP); and Saya Kamitabira, Tokyo (JP)
Assigned to BRIDGESTONE CORPORATION, Tokyo (JP)
Appl. No. 18/579,937
Filed by BRIDGESTONE CORPORATION, Tokyo (JP)
PCT Filed Jun. 23, 2022, PCT No. PCT/JP2022/025149
§ 371(c)(1), (2) Date Jan. 17, 2024,
PCT Pub. No. WO2023/013280, PCT Pub. Date Feb. 9, 2023.
Claims priority of application No. 2021-128531 (JP), filed on Aug. 4, 2021.
Prior Publication US 2024/0336091 A1, Oct. 10, 2024
Int. Cl. B60C 11/13 (2006.01); B60C 11/04 (2006.01); B60C 11/03 (2006.01)
CPC B60C 11/13 (2013.01) [B60C 11/04 (2013.01); B60C 11/1307 (2013.01); B60C 2011/0353 (2013.01); B60C 2011/0365 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A tire comprising a plurality of circumferential main grooves, on a tread surface, extending in the tire circumferential direction and having a groove width that prevents two side walls from contacting each other when the tire is grounded, wherein
when a pair of circumferential main grooves, located closest to tread edges on each side in the tire width direction among the plurality of circumferential main grooves, are referred to as shoulder main grooves, and circumferential main grooves other than the shoulder main grooves are referred to as center main grooves,
all of the shoulder main grooves are normal main grooves configured such that a maximum groove width position in the groove depth direction is located only at a tread surface position,
all of the center main grooves are widened main grooves configured such that at least one maximum groove width position in the groove depth direction is located on a groove bottom side than the tread surface position,
the ratio of the number of widened main grooves to the number of normal main grooves is 1/1 to 3/2,
the tire further comprises a width direction groove that is connected to the shoulder main groove, which is the normal main groove; extends in the tire width direction; and opens at the tread edge,
the width direction groove has a greater groove width on the tread edge side than on the side connecting to the shoulder main groove, which is the normal main groove, and
a cross-sectional shape of each of the widened main grooves is an unobstructed trapezoid defined by a pair of continuous sidewalls and a continuous groove bottom.