Patent ID: 6523591
Filing Date: 2003-02-25
Classification: B60C,Y10T

Abstract:
A tire which is intended to be mounted on a standardized rim of axial width L, with rim flanges with rounded hooks, comprising a tread joined to two beads by two sidewalls and at least one carcass reinforcement formed of at least one ply of reinforcement elements, characterized in that each bead is without a bead wire, said at least one carcass reinforcement having in each bead a curved meridian profile which is formed axially and radially from the outside to the inside of at least one convex arc of a circle BC, possibly extended tangentially by a straight-line segment CD, to form an edge of said at least one carcass reinforcement in the bead, said edge being located within an acute angle a which opens axially and radially towards the inside, the radially outer side of the angle cc being parallel to the axis of rotation and the radially inner side being inclined relative thereto at a value of at most 25Â°, said at least one carcass reinforcement being reinforced in each bead at least radially to the outside and axially to the inside by at least one first continuous additional layer having a meridian profile substantially parallel to the meridian profile of said at least one carcass reinforcement in the bead and comprising at least one first section composed of at least one ply of inextensible reinforcement elements forming an angle of between âˆ’2.5Â° and +2.50 with the circumferential direction, the radially upper end of said at least one first continuous additional layer being distant from the axis of rotation by an amount at least equal to 0.96 times the distance between said axis of rotation and the point of the corresponding flange of the mounting rim farthest from said axis of rotation, and the axially inner end of said at least one first continuous additional layer being distant from the equatorial plane by an amount of at most 0.43 times the width L of the mounting rim.