TYRE BEAD WITHOUT BEAD CORE

摘要

The invention concerns a tyre to be mounted on a rim with axial width L, with rim seats forming with the axis of rotation an angle gamma such that 0 DEG /= gamma /= 16 DEG , and beads with rounded gutters, comprising a tread linked to two beads (3) by two flanks (2) and at least a body ply reinforcement(1) formed by at least one ply with reinforcing elements. The invention is characterised in that each bead (3) is not provided with bead core, said body ply reinforcement (1) having in each bead (3) a meridional profile curved in the axial and radial direction from outside inwards to form an axially inner edge located in an angle alpha axially and radially opening inwards, whereof one of the sides parallel to the axis of rotation, and of a value not less than 25 DEG , said body ply reinforcement (1) being in each bead (3) reinforced at least radially outside and axially inside by at least a first additional continuous layer (6), with meridional profile substantially parallel to the meridional profile of said body ply reinforcement (1) in the bead (3) and comprising at least a first part consisting of a ply (61, 62, 63) of inextensible reinforcing elements forming with the circumferential direction an angle between -2.5 DEG and + 2.5 DEG .