Patent ID: 6591883
Filing Date: 2003-07-15
Classification: B60C,Y10T

Abstract:
A tire of height H when on its rim, comprising at least one radial carcass reinforcement, formed of at least one ply of inextensible reinforcement elements and anchored in each bead to a bead wire to form an upturn, the end of which is located at a radial distance HRNC from the base D of the bead wire, each bead being reinforced by at least two additional reinforcement armatures, at least one first armature formed of at least one ply of inextensible radial metallic reinforcement elements and at least one second armature formed of metallic elements which form with the circumferential direction an angle &agr; such that 0Â°&lE;&agr;&lE;45Â°, characterized in that, viewed in meridian section, the first ply of the at least one first reinforcement armature is wound around the anchoring bead wire of the at least one carcass reinforcement on the inside of said at least one carcass reinforcement to form two strands, such that the axially inner strand, between the radially lower end A of its radially upper edge adjacent to the carcass reinforcement and its point of tangency T to the anchoring bead wire, follows a rectilinear trace AT, referred to as â€œshortest-pathâ€ , and that the radially upper end of said axially inner strand is radially located at a distance HLI from the base D of the bead wire of between 0.216 and 0.432 times the height H, the axially outer strand which is located axially to the inside of the upturn of the at least one carcass reinforcement having its radially upper end radially closer to the axis of rotation than the end of the carcass reinforcement upturn and the distance HLE between said end of the axially outer strand and the base D of the bead wire being between 0.2 and 0.8 times the height HRNC of the upturn of the at least one carcass reinforcement, the at least one second armature not being wound around said anchoring bead wire and arranged axially to the outside of the upturn of the at least one carcass reinforcement.