Patent ID: 8800624
Filing Date: 2014-08-12
Classification: B60C,Y10T

Abstract:
1. A pneumatic tire having a belt formed by a circumferential belt disposed radially inward and an intersecting belt layer of at least two intersecting belts disposed radially outward, said belts being layered radially outward of a carcass, wherein a belt width of the intersecting belt having the maximum belt width along the tire width direction among the intersecting belt layer is set to 80% or more of the maximum width of a carcass line, a difference in belt widths between the intersecting belt having the maximum belt width and the intersecting belt having the second maximum belt width among the intersecting belt layer is set in the range of 10 mm to 50 mm on one side of the belt in the width direction, the belt width has a relationship in which the intersecting belt having the maximum belt width is not narrower than the circumferential belt, and the circumferential belt is not narrower than the intersecting belt having the second maximum belt width, the pneumatic tire has an interposed rubber disposed between both end portions of the circumferential belt and respective end portions of the intersecting belt layer and having a thickness increasing toward the widthwise outer side of the tire to be 3 mm or more, said interposed rubber having a modulus of 100% elongation of 4 MPa or less and a loss tangent of 0.3 or less (room temperature, 2% strain, and 50 Hz), and the pneumatic tire has a side-lower rubber disposed at a side of and a lower portion of the end portion of the circumferential belt and having an elastic modulus not more than the elastic modulus of a coating rubber coating the circumferential belt, wherein a high-hardness rubber member is disposed between the circumferential belt and the side-lower rubber so as to be in contact with at least the circumferential belt, said high-hardness rubber member having an elastic modulus larger than the elastic modulus of a coating rubber coating the circumferential belt.