Run-flat tire
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United States of America Patent
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Jun 4, 2019
Grant Date -
Jul 30, 2015
app pub date -
Jun 25, 2013
filing date -
Aug 21, 2012
priority date (Note) -
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Abstract
It is a run-flat tire 1 provided with a carcass 6 extending from a tread portion 2 through a sidewall portion 3 to a bead core 5 in a bead portion 4, and a side-reinforcement rubber layer 10 disposed inside the carcass 6 in the sidewall portion 3 and having a substantially crescent-shaped cross-section. In a tire meridian cross section including the tire rotational axis under a normal state such that the tire is mounted on a normal rim, inflated to a normal internal pressure and loaded with no load, the tire inner-cavity surface 11 includes a side inner-cavity surface 12. A distance in the tire radial direction of the side inner-cavity surface 12 from a bead toe 4e of the bead portion 4 is in a range of 0.4 times to 0.9 times the length H in the tire radial direction of the tire inner-cavity surface 11. The side inner-cavity surface 12 includes a smooth surface 15 which does not have unevenness, and the total surface area of the smooth surface 15 is more than 90% of the total area of the side inner-cavity surface 12.
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