US 11,794,523 B2
Pneumatic tire
Tatsuhiro Tanaka, Hyogo (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Hyogo (JP)
Filed by SUMITOMO RUBBER INDUSTRIES, LTD., Hyogo (JP)
Filed on Apr. 13, 2022, as Appl. No. 17/719,538.
Application 17/719,538 is a continuation in part of application No. PCT/JP2020/038806, filed on Oct. 14, 2020.
Claims priority of application No. 2019-189446 (JP), filed on Oct. 16, 2019.
Prior Publication US 2022/0250412 A1, Aug. 11, 2022
Int. Cl. B60C 1/00 (2006.01); C08L 9/06 (2006.01)
CPC B60C 1/0016 (2013.01) [C08L 9/06 (2013.01); B60C 2200/04 (2013.01); C08L 2205/035 (2013.01)] 14 Claims
 
1. A pneumatic tire having a flattening ratio of 35 to 70%,
wherein, when Y is defined by the following formula:

OG Complex Work Unit Math
where A (mm) is a total width of the tire and B (mm) is a breaker width of the tire when a tread of the tire, the tire being rim-assembled on a normal rim and being in a normal state with a normal internal pressure and no load, is pressed against a flat surface with a normal load being applied,
a range of the value of Y changes according to the flattening ratio as follows:
when the flattening ratio is 35% or more and less than 40%, Y is 0.80 or less,
when the flattening ratio is 40% or more and less than 45%, Y is 0.79 or less,
when the flattening is 45% or more and less than 50%, Y is 0.78 or less,
when the flattening ratio is 50% or more and less than 55%, Y is 0.77 or less,
when the flattening ratio is 55% or more and less than 60%, Y is 0.75 or less,
when the flattening ratio is 60% or more and less than 65%, Y is 0.72 or less,
when the flattening ratio is 65% or more and less than 70%, Y is 0.69 or less,
when the flattening ratio is 70%, Y is 0.67 or less, and
wherein an elongation at break of a rubber composition of the tread measured under the following test condition is 180% or more:
(Test condition)
Tensile rate: 14.0 m/sec
Temperature: 100° C.
Test piece: Dumbbell-shaped No. 7.