US 12,319,096 B2
Tire
Hiroaki Sato, Kanagawa (JP)
Assigned to The Yokohama Rubber Co., LTD., Tokyo (JP)
Filed by The Yokohama Rubber Co., LTD., Tokyo (JP)
Filed on Apr. 16, 2021, as Appl. No. 17/232,826.
Claims priority of application No. 2020-079746 (JP), filed on Apr. 28, 2020.
Prior Publication US 2021/0331525 A1, Oct. 28, 2021
Int. Cl. B60C 11/03 (2006.01); B60C 11/13 (2006.01)
CPC B60C 11/0309 (2013.01) [B60C 2011/0351 (2013.01); B60C 2011/0353 (2013.01); B60C 2011/0355 (2013.01); B60C 2011/0365 (2013.01); B60C 2011/0367 (2013.01); B60C 2011/0372 (2013.01); B60C 2011/1338 (2013.01); B60C 2200/06 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A tire, comprising:
a plurality of main lug grooves that extend in a tire width direction and penetrate a tread surface, and that are arranged at predetermined intervals in a tire circumferential direction,
a plurality of sub lug grooves that extend in the tire width direction and penetrate the tread surface, and that are arranged at predetermined intervals in the tire circumferential direction,
three or more circumferential grooves extending in the tire circumferential direction, and
four or more rows of land portions defined by the main lug grooves, the sub lug grooves, and the circumferential grooves,
each of the main lug grooves and each of the sub lug grooves penetrating the tread surface by extending continuously across an entirety of the tread surface in the tire width direction to tire ground contact edges on both sides of the tread surface in the tire width direction,
the main lug grooves being defined as lug grooves having a maximum groove width Wg1 of 15.0 mm or more and a maximum groove depth Hg1 of 23.5 mm or more,
the sub lug grooves being defined as lug grooves having a maximum groove width Wg2 that satisfies a condition of 0.10≤Wg2/Wg1≤0.35 with respect to the maximum groove width Wg1 of the main lug grooves,
at least one of the sub lug grooves being disposed between adjacent ones of the main lug grooves,
the circumferential grooves being defined as circumferential grooves having a maximum groove width of 12.5 mm or more and a maximum groove depth of 70% or more of the maximum groove depth Hg1 of the main lug grooves,
among the three or more circumferential grooves, a pair of shoulder circumferential grooves on an outermost side in the tire width direction and a center circumferential groove located between the pair of shoulder circumferential grooves being defined,
a maximum groove width Wg3 of the pair of shoulder circumferential grooves having a relationship 0.25≤Wg3/Wg1≤0.55 with respect to the maximum groove width Wg1 of the main lug grooves, and
a distance Dg3 from a tire equatorial plane to a groove center line of each of the pair of shoulder circumferential grooves having a relationship 0.20≤Dg3/TW≤0.35 with respect to a tire ground contact width TW.
 
12. A tire, comprising:
a plurality of main lug grooves that extend in a tire width direction and penetrate a tread surface, and that are arranged at predetermined intervals in a tire circumferential direction,
a plurality of sub lug grooves that extend in the tire width direction and penetrate the tread surface, and that are arranged at predetermined intervals in the tire circumferential direction,
three or more circumferential grooves extending in the tire circumferential direction, and
four or more rows of land portions defined by the main lug grooves, the sub lug grooves, and the circumferential grooves,
each of the main lug grooves and each of the sub lug grooves penetrating the tread surface by extending continuously across an entirety of the tread surface in the tire width direction to tire ground contact edges on both sides of the tread surface in the tire width direction,
the main lug grooves being defined as lug grooves having a maximum groove width Wg1 of 15.0 mm or more and a maximum groove depth Hg1 of 23.5 mm or more,
the sub lug grooves being defined as lug grooves having a maximum groove width Wg2 that satisfies a condition of 0.10≤Wg2/Wg1≤0.35 with respect to the maximum groove width Wg1 of the main lug grooves,
at least one of the sub lug grooves being disposed between adjacent ones of the main lug grooves,
the circumferential grooves being defined as circumferential grooves having a maximum groove width of 12.5 mm or more and a maximum groove depth of 70% or more of the maximum groove depth Hg1 of the main lug grooves,
among the three or more circumferential grooves, a pair of shoulder circumferential grooves on an outermost side in the tire width direction and a center circumferential groove located between the pair of shoulder circumferential grooves being defined,
a maximum groove width Wg3 of the pair of shoulder circumferential grooves having a relationship 0.25≤Wg3/Wg1≤0.55 with respect to the maximum groove width Wg1 of the main lug grooves,
among the four rows of land portions, a pair of shoulder land portions defined by a tire ground contact edge and the shoulder circumferential grooves being defined,
the shoulder land portion comprising a circumferential-direction shallow groove extending in the tire circumferential direction,
the circumferential-direction shallow groove being defined as a circumferential groove having a maximum groove depth of less than 70% of the maximum groove depth Hg1 of the main lug groove, and
a maximum groove width W12 of the circumferential-direction shallow groove having a relationship 0.50≤W12/Wg3≤0.90 with respect to the maximum groove width Wg3 of the shoulder circumferential grooves.