US 12,403,727 B2
Pneumatic tire
Hironori Wada, Kanagawa (JP)
Assigned to The Yokohama Rubber Co., LTD., Tokyo (JP)
Appl. No. 17/754,007
Filed by The Yokohama Rubber Co., LTD., Tokyo (JP)
PCT Filed Jul. 6, 2020, PCT No. PCT/JP2020/026442
§ 371(c)(1), (2) Date Mar. 21, 2022,
PCT Pub. No. WO2021/059662, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 2019-174665 (JP), filed on Sep. 25, 2019.
Prior Publication US 2022/0348040 A1, Nov. 3, 2022
Int. Cl. B60C 11/04 (2006.01); B60C 11/13 (2006.01); B60C 11/03 (2006.01)
CPC B60C 11/04 (2013.01) [B60C 2011/0346 (2013.01); B60C 2011/0381 (2013.01); B60C 2011/0388 (2013.01); B60C 2200/04 (2013.01); B60C 2200/06 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A pneumatic tire comprising:
a plurality of main grooves having a zigzag shape and extending in a tire circumferential direction; and,
a land portion defined by the main grooves adjacent to each other, the land portion having a rib structure that is continuous in the tire circumferential direction,
the land portion comprising first and second lug grooves having a semi-closed structure,
a maximum length L21 of the first lug groove in a tire width direction having a relationship 1.30≤L21/L22≤2.30 with respect to a maximum length L22 of the second lug groove,
the first and second lug grooves being open to an edge portion of the land portion on a tire ground contact edge side; and
an edge portion of the land portion on the tire equatorial plane side having a plain structure that is not divided by lug grooves; wherein
of the main grooves defining the land portion, the main groove on a tire ground contact edge side has a zigzag shape formed by alternately connecting linear portions having an approximately identical length,
a circumferential length Lg1 of the linear portion has a relationship 0.30≤Lg1/λ1≤0.70 with respect to a wavelength λ1 of the zigzag shape,
the main groove on a tire equatorial plane side has a zigzag shape formed by alternately connecting long portions and short portions,
a circumferential length Lg2 of the long portion has a relationship 0.70≤Lg2/λ2<0.90 with respect to a wavelength λ2 of the zigzag shape; and
the first lug groove is disposed opposite the long portion of the main groove on the tire equatorial plane side.
 
13. A pneumatic tire comprising:
a plurality of main grooves having a zigzag shape and extending in a tire circumferential direction; and,
a land portion defined by the main grooves adjacent to each other, the land portion having a rib structure that is continuous in the tire circumferential direction,
the land portion comprising first and second lug grooves having a semi-closed structure,
a maximum length L21 of the first lug groove in a tire width direction having a relationship 1.30≤L21/L22≤2.30 with respect to a maximum length L22 of the second lug groove, and
a maximum groove depth H22 of the second lug groove having a relationship 1.20≤H22/H21≤1.60 with respect to a maximum groove depth H21 of the first lug groove.
 
14. A pneumatic tire comprising:
a plurality of main grooves having a zigzag shape and extending in a tire circumferential direction; and,
a land portion defined by the main grooves adjacent to each other, the land portion having a rib structure that is continuous in the tire circumferential direction,
the land portion comprising first and second lug grooves having a semi-closed structure,
a maximum length L21 of the first lug groove in a tire width direction having a relationship 1.30≤L21/L22≤2.30 with respect to a maximum length L22 of the second lug groove,
of the main grooves defining the land portion, the main groove on a tire ground contact edge side having a zigzag shape with a wavelength λ1 formed by alternately connecting linear portions having an approximately identical length,
the main groove on a tire equatorial plane side having a zigzag shape with a wavelength λ2 formed by alternately connecting long portions and short portions, and
the wavelengths λ1, λ2 having a relationship 1.50 ≤λ2/λ1≤2.00.
 
15. A pneumatic tire comprising:
a plurality of main grooves having a zigzag shape and extending in a tire circumferential direction; and,
a land portion defined by the main grooves adjacent to each other, the land portion having a rib structure that is continuous in the tire circumferential direction,
the land portion comprising first and second lug grooves having a semi-closed structure,
a maximum length L21 of the first lug groove in a tire width direction having a relationship 1.30≤L21/L22≤2.30 with respect to a maximum length L22 of the second lug groove,
the first and second lug grooves being open to an edge portion of the land portion on a tire ground contact edge side; and
an edge portion of the land portion on the tire equatorial plane side having a plain structure that is not divided by lug grooves; wherein
of the main grooves defining the land portion, the main groove on a tire ground contact edge side has a zigzag shape formed by alternately connecting linear portions having an approximately identical length,
a circumferential length Lg1 of the linear portion has a relationship 0.30≤Lg1/λ1≤0.70 with respect to a wavelength λ1 of the zigzag shape,
the main groove on a tire equatorial plane side has a zigzag shape formed by alternately connecting long portions and short portions,
a circumferential length Lg2 of the long portion has a relationship 0.70≤Lg2/λ2≤0.90 with respect to a wavelength λ2 of the zigzag shape;
and
the first lug groove has an inclination direction with respect to the tire circumferential direction, the inclination direction being identical with respect to an inclination direction of the long portion of the main groove on the tire equatorial plane side.