US 12,227,032 B2
Pneumatic tire
Nobuyuki Ishihara, Tokyo (JP)
Assigned to BRIDGESTONE CORPORATION, Tokyo (JP)
Appl. No. 17/762,181
Filed by BRIDGESTONE CORPORATION, Tokyo (JP)
PCT Filed Sep. 30, 2020, PCT No. PCT/JP2020/037246
§ 371(c)(1), (2) Date Mar. 21, 2022,
PCT Pub. No. WO2021/085022, PCT Pub. Date May 6, 2021.
Claims priority of application No. 2019-195799 (JP), filed on Oct. 29, 2019.
Prior Publication US 2022/0371379 A1, Nov. 24, 2022
Int. Cl. B60C 11/11 (2006.01); B60C 11/12 (2006.01); B60C 11/01 (2006.01); B60C 11/03 (2006.01); B60C 11/13 (2006.01)
CPC B60C 11/12 (2013.01) [B60C 11/11 (2013.01); B60C 11/1281 (2013.01); B60C 2011/013 (2013.01); B60C 2011/0344 (2013.01); B60C 2011/0348 (2013.01); B60C 2011/133 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A pneumatic tire in which a tread (7) of the tire is partitioned into a plurality of land portions (12A, 12B, 12C, 12D) that are continuous in a tire circumferential direction, by a plurality of circumferential grooves (11a, 11b, 11c, 11d) extending in the tire circumferential direction, the land portions (12A, 12B, 12C, 12D) continuous in the tire circumferential direction are divided into a plurality of blocks (14A, 14B, 14C, 14D) by a plurality of widthwise grooves (13a, 13b, 13c, 13d) extending in a tire widthwise direction, and the blocks (14A, 14B, 14C, 14D) are segmented in a plurality of segmented blocks (14Ap, 14Bp, 14Cp, 14Dp) by a plurality of widthwise sipes (15) extending in the tire widthwise direction, characterized in that:
the circumferential grooves (11a, 11b, 11c, 11d) include a pair of outermost side circumferential grooves (11d, 11d) on outermost sides in the tire widthwise direction and a plurality of inner side circumferential grooves (11a, 11b, 11c) arrayed between the outermost side circumferential grooves (11d, 11d),
the inner side circumferential grooves (11a, 11b, 11c) have a groove width that is smaller than that of the outermost side circumferential grooves (11d), to such a degree to allow the land portions on opposite sides thereof to come into contact with each other upon grounding, and
a plurality of recessed portions(S) of a shape cut in a radial direction from a tread face are formed along the tire circumferential direction on block wall faces (14Af, 14Bf), which are opposed to each other, of the blocks (14A, 14B) on opposite sides of at least one (11b) of the inner side circumferential grooves,
each of the recessed portions(S) has an opening end face configured to be closed by contacting with a block wall face opposed to the recessed portion(S) upon grounding, and
the recessed portions(S) are formed at positions that are displaced in the tire circumferential direction from and do not overlap with widthwise sipes (15) formed on the blocks (14A, 14B) that have the recessed portions(S).