US 12,257,866 B2
Pneumatic tire
Kenji Hamamura, Kobe (JP); Hiroki Kawai, Kobe (JP); and Subaru Toya, Kobe (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Kobe (JP)
Appl. No. 18/018,099
Filed by Sumitomo Rubber Industries, Ltd., Kobe (JP)
PCT Filed Jul. 20, 2021, PCT No. PCT/JP2021/027204
§ 371(c)(1), (2) Date Jan. 26, 2023,
PCT Pub. No. WO2022/030253, PCT Pub. Date Feb. 10, 2022.
Claims priority of application No. 2020-132439 (JP), filed on Aug. 4, 2020.
Prior Publication US 2023/0286329 A1, Sep. 14, 2023
Int. Cl. B60C 3/04 (2006.01); B60C 13/00 (2006.01)
CPC B60C 3/04 (2013.01) [B60C 2013/005 (2013.01); B60C 2013/006 (2013.01); B60C 2013/007 (2013.01); B60C 2200/04 (2013.01)] 14 Claims
 
1. A pneumatic tire having a side portion, wherein
the thickness S (mm) of the rubber layer radially outside the carcass of the side portion at the maximum width position of the tire is 3 mm or less;
the loss tangent (70° C. tan δ) of the rubber layer is 0.15 or less measured under the conditions of 70° C., frequency of 10 Hz, initial strain of 5%, and dynamic strain rate of 1%; and,
when the cross-sectional width of the tire is Wt (mm), the outer diameter is Dt (mm), and the volume of the space occupied by the tire is virtual volume V (mm3), the tire is installed on a standardized rim and the internal pressure is 250 kPa, the tire satisfies (formula 1), (formula 3) and (formula 7):
1700≤(Dt2×π/4)/Wt≤2827.4  (formula 1)
[(V+2.0×107)/Wt]≤2.44×105  (formula 3)
70° C. tan δ×(V/Wt)×S≤40000  (formula 7).