| 摘要 |
A tire produced from at least one liquid or paste material which solidifies in a tire mold to form the elastomeric material of the tire, consisting of a crown with two shoulders each connected to a sidewall terminating in a bead containing at least one bead ring, is characterized by the fact that it comprises a number of successive discrete radial hoops which are equally spaced apart in the longitudinal direction of the tire, are identical, consist at least in part of a moldable material, are embedded in the elastomeric material of the tire, are continuous from one bead to the other and are provided at each of their ends with a hook within which the bead ring is arranged, the hook being provided with at least one extension which extends up to a wall of the tire, and by the fact that the hoops, which are manufactured flat, are bent or curved by bringing the bead rings towards each other in the axial direction in order to impose upon the hoops a meridian trajectory corresponding substantially to the meridian curvature of the core of the tire mold, each normal section of each hoop at any given point (N) on the imposed meridian trajectory has a moment of inertia of flexure satisfying the law In=SxYnx rho n In being the moment of inertia of flexure of the normal section of each hoop at the given point (N) on the imposed meridian trajectory in the tire mold, S being a constant coefficient equal to the ratio of the axial bending force (P) applied to each flat hoop to the modulus of elasticity (E) of the material forming the hoop, Yn being the radial distance from the given point (N) on the imposed meridian trajectory to the median axis of the flat hoop, rho n being the radius of local curvature at the given point (N) on the imposed meridian trajectory. |
