US 12,030,346 B2
Pneumatic tire
Shun Sato, Kanagawa (JP)
Assigned to The Yokohama Rubber Co., LTD., Tokyo (JP)
Appl. No. 17/270,628
Filed by The Yokohama Rubber Co., LTD., Tokyo (JP)
PCT Filed Aug. 16, 2019, PCT No. PCT/JP2019/032154
§ 371(c)(1), (2) Date Feb. 23, 2021,
PCT Pub. No. WO2020/045130, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 2018-161361 (JP), filed on Aug. 30, 2018.
Prior Publication US 2021/0260930 A1, Aug. 26, 2021
Int. Cl. B60C 11/13 (2006.01); B60C 11/03 (2006.01)
CPC B60C 11/0309 (2013.01) [B60C 11/033 (2013.01); B60C 11/1353 (2013.01); B60C 2011/0344 (2013.01); B60C 2011/0346 (2013.01); B60C 2011/0351 (2013.01); B60C 2011/0355 (2013.01); B60C 2011/0362 (2013.01); B60C 2011/133 (2013.01); B60C 2200/14 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A pneumatic tire, comprising:
two circumferential main grooves extending in a tire circumferential direction and arranged side by side in a tire width direction; and
a first land portion defined by the two circumferential main grooves,
the two circumferential main grooves comprising an inner circumferential main groove closest to a tire equatorial plane and an outer circumferential main groove provided on an outer side in the tire width direction of the inner circumferential main groove,
the first land portion comprising a notch portion extending in the tire width direction and connected to the circumferential main groove and a shallow groove portion connected to the notch portion and terminating in the first land portion, the notch portion being sandwiched between the circumferential main groove and the shallow groove portion in the tire width direction, and
a height of the notch portion decreasing continuously toward the circumferential main groove connected thereto; wherein
a ratio of a length in the tire width direction of a planar portion of a bottom portion of the notch portion to a length in the tire width direction of the shallow groove portion is greater than 0 and equal to or smaller than 0.5.
 
13. A pneumatic tire, comprising:
two circumferential main grooves extending in a tire circumferential direction and arranged side by side in a tire width direction; and
a first land portion defined by the two circumferential main grooves,
the two circumferential main grooves comprising an inner circumferential main groove closest to a tire equatorial plane and an outer circumferential main groove provided on an outer side in the tire width direction of the inner circumferential main groove,
the first land portion comprising a notch portion extending in the tire width direction and connected to the circumferential main groove and a shallow groove portion connected to the notch portion and terminating in the first land portion, and a height of the notch portion decreasing continuously toward the circumferential main groove connected thereto; wherein
the notch portion comprises an inner notch portion extending in the tire width direction and connected to the inner circumferential main groove and an outer notch portion extending in the tire width direction and connected to the outer circumferential main groove,
the shallow groove portion comprises an inner shallow groove portion connected to the inner notch portion and terminating in the first land portion and an outer shallow groove portion connected to the outer notch portion and terminating in the first land portion, and
in the outer notch portion and the outer shallow groove portion connected to the outer notch portion, a ratio S1/S2 of a projected area S1 of the outer shallow groove portion to a projected area S2 of the outer notch portion is 0.1≤S1/S2≤0.5.
 
14. A pneumatic tire, comprising:
two circumferential main grooves extending in a tire circumferential direction and arranged side by side in a tire width direction; and
a first land portion defined by the two circumferential main grooves,
the two circumferential main grooves comprising an inner circumferential main groove closest to a tire equatorial plane and an outer circumferential main groove provided on an outer side in the tire width direction of the inner circumferential main groove,
the first land portion comprising a notch portion extending in the tire width direction and connected to the circumferential main groove and a shallow groove portion connected to the notch portion and terminating in the first land portion, and a height of the notch portion decreasing continuously toward the circumferential main groove connected thereto; wherein
the notch portion comprises an inner notch portion extending in the tire width direction and connected to the inner circumferential main groove and an outer notch portion extending in the tire width direction and connected to the outer circumferential main groove, and
the shallow groove portion comprises an inner shallow groove portion connected to the inner notch portion and terminating in the first land portion and an outer shallow groove portion connected to the outer notch portion and terminating in the first land portion, and
in the inner notch portion and the inner shallow groove portion connected to the inner notch portion, a ratio S3/S4 of a projected area S3 of the inner shallow groove portion to a projected area S4 of the inner notch portion is 0.5≤S3/S4≤0.9.