Abstract: A banded radial run-flat pneumatic tire with a transversely segmented band that varies the bending stiffness of the band circumferentially relative to the bending stiffness across the band. The band can be segmented into annular side-by-side hoop-like coaxial band elements either of the same or of different diameters. An elastomer bonded between adjoining circumferential edges of the band elements connects them for cooperative association to give the band its desired operating characteristics. The elasticity of the elastomer and the spacing between the band elements can be selected to tailor the performance of the band. Preferably the bending stiffness of the band is 1000 times as great circumferentially as it is transversely across the band.

Abstract: A banded radial run-flat tire having a band with a dual-modulus of bending deflection behavior. Bands producing various basic dual-modulus characteristics are disclosed. In one type, the band has a greater resistance to bending forces tending to decrease its local radius of curvature than to those tending to flatten it. In a second type, bending stiffness increases with increasing stress irrespective of the bending direction. In a third type, a two-step modulus is demonstrated in which deflection is initially resisted at one rate and final deflection is resisted at a higher rate. Various embodiments of the band are disclosed in which the various types of dual-modulus behavior are obtained either by mechanical structural means or by internal geometry means.