Pneumatic tire

Abstract

In a pneumatic tire, a height from a turned-up edge of a carcass layer (4) is not more than 10 mm, a distance GO from a tire outer surface to the carcass layer (4) is not less than 50% of the total gauge, a height HB of the bead filler (6) is from 50% to 80% of a tire cross-section height SH, a cross-sectional area ratio VB / VR of the bead filler (6) to a side reinforcing layer (9) is not less than 0.4 and not more than 0.6, a hardness HsB of the bead filler (6) is not less than 65 and not more than 80, and the hardness HsR of the side reinforcing layer (9) is not less than 75 and not more than 85, a size relationship between the hardness HsB and the hardness HsR is HsB<=HsR, a dynamic elastic modulus E'B is not less than 7.0 MPa and not more than 15.0 MPa, and a dynamic elastic modulus E'R is not less than 7.0 MPa and not more than 15.0 MPa, a value TB of tan delta is not more than 0.06, and a value TR of tan delta is not more than 0.05. The invention provides a pneumatic tire by which both riding comfort when regular traveling and run-flat durability can be achieved at high levels.

Description

technical field [0001] The present invention relates to a pneumatic tire, and more specifically, to a pneumatic tire capable of achieving a high degree of both ride comfort during normal running and zero-pressure running durability. Background technique [0002] Among pneumatic tires, there is known a sidewall-reinforced zero-pressure pneumatic tire in which a crescent-shaped reinforced rubber layer is inserted into the inner surface of the sidewall, and based on the rigidity of the reinforced rubber layer, zero-pressure running can be performed (for example, refer to Patent Document 1). Although this kind of sidewall-reinforced zero-pressure pneumatic tire has the advantage of realizing zero-pressure running based on the tire structure without relying on supports such as cores installed on the wheel, it also has the disadvantage that the rigidity of the sidewall is higher than that of ordinary tires. , leading to the disadvantage of reduced ride comfort during normal drivi...

AI Technical Summary

Problems solved by technology

However, in zero-pressure tires whose tire rigidity has been reduced in this way, there is a tendency to cause failures caused by rupture of the upper ply of the bead core, and it is not necessarily possible to achieve both zero-pressure driving durability and ride comfort during normal driving. There is still room for improvement in terms of driving durability and ride comfort during normal driving

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