| 摘要 |
PURPOSE: A structure of a tread belt flies of a radial tire is provided to improve controlling stability by an asymmetric belt arrangement with end cut portions of an inner belt and an outer belt different in an angle. CONSTITUTION: A structure of a tread belt flies of a radial tire improves transverse and longitudinal rigidity of the tire by differences in rigidity of the inside and the outside of the belt flies. End cut portions(6a,6b) of first and second belts(5a,5b) have specific curvature(R). An angle of the belt of the end cut portion is between fifteen and sixty degrees for an assumed line(L). Therefore, controlling stability is improved by preventing stress from concentrating because end cut portions increase or decrease continually without changes of angles.
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