Bead for a tire for a civil-engineering heavy vehicle

#This is a U.S. National Phase Application under 35 USC 371 of International Application PCT/FR2019/051790 filed on Jul. 17, 2019.

#This application claims the priority of French application no. 18/56845 filed Jul. 24, 2018, the entire content of which is hereby incorporated by reference.

#The present invention relates to a radial tire intended to be fitted to a civil-engineering heavy vehicle.

#The features of the invention will be better understood with the aid of the description of the attached FIGS. 1, 2 and 3:

#FIG. 1 represents a sectional view in a meridian plane of the bead of a tire for a civil-engineering heavy vehicle of the prior art.

#FIG. 2 represents a sectional view in a meridian plane of the bead of a tire for a civil-engineering heavy vehicle, according to the invention.

#In order to make them easier to understand, FIGS. 1, 2 and 3 are not drawn to scale.

#FIG. 1 shows a bead 1 of a tire for a civil-engineering heavy vehicle of the prior art, mounted on a rim 2, comprising: a carcass reinforcement 3 comprising a single carcass layer 31 made up of metallic reinforcing elements coated with an elastomeric coating material, with a main carcass layer part 311 wrapping, from the inside towards the outside of the tire, around a bead wire core 4, to form a carcass layer turn-up 312; a filler element 91 radially outwardly extending the bead wire core 4, having, in every meridian plane, a substantially triangular cross section and being made up of an elastomeric filler material; a protection element 7 axially inwardly extending a sidewall 8 and made up of an elastomeric protection material; a filling element 92 axially on the inside of the protection element 7 and of the sidewall 8 and axially on the outside of the carcass reinforcement turn-up 312 and made up of an elastomeric filling material; a bead reinforcing layer 5 extending between a radially outer end 51 and a radially inner end 52, axially on the outside of and in contact with the carcass layer turn-up 312.

#FIG. 2 shows a bead of a tire for a civil-engineering heavy vehicle, according to the invention, comprising: a carcass reinforcement 3 comprising a single carcass layer 31 made up of metallic reinforcing elements coated with an elastomeric coating material, with a main carcass layer part 311 wrapping, from the inside towards the outside of the tire, around a bead wire core 4, to form a carcass layer turn-up 312; a filler element 91 radially outwardly extending the bead wire core 4, having, in every meridian plane, a substantially rectangular cross section and being made up of an elastomeric filler material; a protection element 7 axially inwardly extending a sidewall 8 and made up of an elastomeric protection material; a filling element 92 axially on the inside of the protection element 7 and of the sidewall 8 and axially on the outside of the carcass reinforcement turn-up 312 and made up of an elastomeric filling material; a bead reinforcing layer 5 extending between a radially outer end 51 and a radially inner end 52, axially on the outside of and in contact with the carcass layer turn-up 312; a cushion rubber 6 in contact, via an axially inner face, with the elastomeric coating material of the axially outer face of the carcass layer turn-up 312 and, via an axially outer face, with the elastomeric coating material of the bead reinforcing layer 5.