US 12,280,616 B2
Pneumatic tire
Mayuko Karasawa, Tokyo (JP); and Kai Yamada, Tokyo (JP)
Assigned to BRIDGESTONE CORPORATION, Tokyo (JP)
Appl. No. 18/264,580
Filed by BRIDGESTONE CORPORATION, Tokyo (JP)
PCT Filed Nov. 5, 2021, PCT No. PCT/JP2021/040889
§ 371(c)(1), (2) Date Aug. 8, 2023,
PCT Pub. No. WO2022/185618, PCT Pub. Date Sep. 9, 2022.
Claims priority of application No. 2021-032170 (JP), filed on Mar. 1, 2021.
Prior Publication US 2024/0109373 A1, Apr. 4, 2024
Int. Cl. B60C 11/11 (2006.01); B60C 11/03 (2006.01); B60C 11/12 (2006.01); B60C 11/13 (2006.01); B60C 11/01 (2006.01)
CPC B60C 11/0309 (2013.01) [B60C 11/1204 (2013.01); B60C 11/1315 (2013.01); B60C 2011/013 (2013.01); B60C 2011/0346 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A pneumatic tire comprising
a tread surface including:
two or more main grooves; and
a pair of middle block rows located adjacent to and inwards in a tire width direction of a pair of outer main grooves in the two or more main grooves that are positioned on outermost sides in the tire width direction, wherein
each middle block row in the pair of middle block rows includes a plurality of middle blocks arranged along a tire circumferential direction,
one or more first middle blocks in the plurality of middle blocks each have a middle block inclined side wall surface that 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,
the middle block inclined side wall surface forms an acute angle of 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,
one or more second middle blocks in the plurality of middle blocks each have a middle block vertical side wall surface that faces an outer main groove in the pair of outer main grooves,
the acute angle that the middle block inclined side wall surface forms with respect to the normal of the tread surface at the inner end in the tire width direction of the middle block inclined side wall surface is greater than an acute angle that the middle block vertical side wall surface forms with respect to the normal of the tread surface at an inner end in the tire width direction of the middle block vertical side wall surface, and
an outer end in the tire width direction of the middle block inclined side wall surface is positioned outwards in the tire width direction of an outer end in the tire width direction of the middle block vertical side wall surface.