US 12,459,296 B2
Tire
Masaki Oshimo, Hyogo (JP); and You Toshima, Hyogo (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Hyogo (JP)
Appl. No. 18/015,617
Filed by SUMITOMO RUBBER INDUSTRIES, LTD., Hyogo (JP)
PCT Filed Jul. 20, 2021, PCT No. PCT/JP2021/027181
§ 371(c)(1), (2) Date Jan. 11, 2023,
PCT Pub. No. WO2022/024884, PCT Pub. Date Feb. 3, 2022.
Claims priority of application No. 2020-128369 (JP), filed on Jul. 29, 2020.
Prior Publication US 2023/0286325 A1, Sep. 14, 2023
Int. Cl. B60C 11/00 (2006.01); B60C 1/00 (2006.01); B60C 11/03 (2006.01)
CPC B60C 1/0016 (2013.01) [B60C 2011/0016 (2013.01); B60C 2011/0025 (2013.01); B60C 2011/0341 (2013.01); B60C 2011/0346 (2013.01); B60C 2011/0355 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A tire comprising a tread composed of a rubber composition comprising a rubber component,
wherein the tread has a circumferential main groove extending continuously in a tire circumferential direction, the circumferential main groove being in one or a plurality,
wherein, at a bending part in a plurality, the circumferential main groove bends and extends in the tire circumferential direction such that a center line of the circumferential main groove deviates in a tire width direction or an extending direction of the center line of the circumferential main groove changes preceding and following the bending part,
wherein a peak-to-peak amplitude λ1 in the tire width direction of a groove center line of the circumferential main groove is 2.0 mm or more and 6.0 mm or less,
wherein the rubber composition has tan δ at 20° C. (20° C. tan δ) of 0.30 or less, and breaking strength TB (MPa) at 175° C. and elongation at break EB (%) at 175° C. satisfying a relational expression of
TB×EB/2≥600,
wherein TB×EB/λ1 is 50 to 600, and
wherein the rubber composition comprises 25 parts by mass or more of silica, based on 100 parts by mass of the rubber component.
 
17. A tire comprising a tread composed of a rubber composition comprising a rubber component,
wherein the rubber component comprises an isoprene-based rubber,
wherein the isoprene-based rubber is at least one selected from the group consisting of natural rubber and isoprene rubber (IR),
wherein the tread has a circumferential main groove extending continuously in a tire circumferential direction, the circumferential main groove being in one or a plurality,
wherein, at a bending part in a plurality, the circumferential main groove bends and extends in the tire circumferential direction such that a center line of the circumferential main groove deviates in a tire width direction or an extending direction of the center line of the circumferential main groove changes preceding and following the bending part,
wherein a peak-to-peak amplitude λ1 in the tire width direction of a groove center line of the circumferential main groove is 2.0 mm or more,
wherein the rubber composition has tan δ at 20° C. (20° C. tan δ) of 0.30 or less, and breaking strength TB (MPa) at 175° C. and elongation at break EB (%) at 175° C. satisfying a relational expression of
TB×EB/2≥600,
wherein TB×EB/λ1 50 to 600, and
wherein the rubber component only consists of the isoprene-based rubber, a styrene-butadiene rubber, and a butadiene rubber, or only consists of the isoprene-based rubber and a styrene-butadiene rubber.