US 12,319,094 B2
Tire
Tomohisa Kuriyama, Hyogo (JP); Ryota Ikeda, Hyogo (JP); Chisato Omori, Hyogo (JP); Kohei Miyoshi, Hyogo (JP); and Hiroaki Koga, Hyogo (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Hyogo (JP)
Filed by SUMITOMO RUBBER INDUSTRIES, LTD., Hyogo (JP)
Filed on Dec. 9, 2021, as Appl. No. 17/546,188.
Claims priority of application No. 2020-218180 (JP), filed on Dec. 28, 2020; and application No. 2020-218182 (JP), filed on Dec. 28, 2020.
Prior Publication US 2022/0203774 A1, Jun. 30, 2022
Int. Cl. B60C 11/03 (2006.01); B60C 11/12 (2006.01)
CPC B60C 11/0304 (2013.01) [B60C 11/1236 (2013.01); B60C 11/1263 (2013.01); B60C 2011/0353 (2013.01); B60C 2011/0386 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A tire comprising:
a tread portion having a designated mounting direction to a vehicle, the tread portion comprising a first tread edge located outside of a vehicle when mounted on the vehicle, a second tread edge located inside of a vehicle when mounted on the vehicle, a plurality of circumferential grooves extending continuously in the tire circumferential direction between the first tread edge and the second tread edge, and a plurality of land portions divided by the plurality of circumferential grooves,
wherein
the plurality of land portions comprises a crown land portion located on the tire equator, a first middle land portion adjacent to the crown land portion on the first tread edge side, a second middle land portion adjacent to the crown land portion on the second tread edge side, and a first shoulder land portion adjacent to the first middle land portion on the first tread edge side,
under a 50% loaded condition in which the tire is mounted onto a standard wheel rim with a standard pressure and grounded to a plane with a 50% tire load of a standard tire load at zero camber angles, the first middle land portion, the crown land portion, and the second middle land portion respectively have widths W1m, Wc, and W2m of ground contact surfaces in a tire axial direction, the widths W1m, Wc, and W2m satisfying the following formula (1)
W1m>Wc>W2m  (1),
the crown land portion comprises an outer ground contact surface located on the first tread edge side with respect to the tire equator, and an inner ground contact surface located on the second tread edge side with respect to the tire equator,
the outer ground contact surface and the inner ground contact surface respectively have widths Wco and Wci in the tire axial direction, the widths Wco and Wci satisfying the following formula (2)
Wco>Wci  (2),
the first middle land portion is provided with a plurality of first middle sipes extending in the tire axial direction,
each first middle sipe includes a main portion extending in the tire radial direction and a widening width portion opening to a tread face of the first middle land portion and having a larger width than that of the main portion,
the first shoulder land portion is provided with a plurality of first shoulder sipes extending in the tire axial direction,
each first shoulder sipe includes a main portion extending in the tire radial direction and a widening width portion opening to a tread face of the first shoulder land portion and having a larger width than that of the main portion of the first shoulder sipe,
an opening width W4 of each first shoulder sipe on the tread face of the first shoulder land portion is greater than an opening width W5 of each first middle sipe on the tread face of the first middle land portion, and
a depth d1 of the widening width portion of each first shoulder sipe is smaller than a depth d2 of the widening width portion of each first middle sipe.