Patent ID: 6494242
Filing Date: 2002-12-17
Classification: B60C,Y10T

Abstract:
A tire comprising at least one carcass anchored in each side of the tire in a bead, the bead having a base which is intended to be mounted on the tire's design mounting rim, each bead being extended radially upward by a sidewall portion, the sidewall portions joining a tread portion, wherein when the tire is mounted on the design rim and inflated to the tire's nominal pressure,a median reference profile is defined by the locus of points corresponding to the median position between the axially innermost surface and the axially outermost surface of the tire, a rim reference point R in said bead is defined having an axial coordinate measured from the tire equatorial plane equal to one half the nominal width of the mounting rim and a radial coordinate measured from the axis of tire rotation equal to one half the nominal diameter of the mounting rim, a bead reference point Z is defined as the intersection of the outermost surface of the tire with a horizontal line offset radially outward a distance from the radial coordinate of the rim reference point R, a tread reference point N is defined on the outermost surface of the tire at the junction between the tread and sidewall portions of the tire, a sidewall reference point P is defined on the outermost surface of the sidewall of the tire and located between said reference points Z and N; wherein an axially outermost carcass is disposed axially outward of said median reference profile at radial positions between said sidewall reference point P and said tread reference point N, wherein said axially outermost carcass intersects said median reference profile at a point Q and said point Q has a radial position between said reference point Z and said reference point P, said axially outermost carcass thereafter being disposed axially to the interior of said median reference profile at radial positions inward of said point Q; wherein each axial coordinate of said axially outermost carcass has a corresponding unique radial coordinate at each radial position inward of said sidewall reference point P, and said tire further comprises a first bead reinforcement anchoring said at least one carcass in the beads and a second bead reinforcement providing retention of the beads on the mounting rim in a deflated condition of the tire.