Tire provided with a radio frequency communication module
View Patent ↗A tire is equipped with a radiofrequency communication module with a carcass reinforcement comprising two carcass plies such that the communication module is positioned in the bead axially on the outside of and against the second carcass ply.
1. A tire comprising a crown, two sidewalls and two beads with an axis of revolution and a carcass reinforcement with two carcass plies, each anchored in each bead, each bead comprising:
a bead wire;
a part of a first carcass ply extended by a turn-up around the bead wire of the first carcass ply such that the end of the turn-up is situated axially and radially on an outside relative to the bead wire;
a filler arranged radially on the outside relative to the bead wire and axially between the first carcass ply and the turn-up;
a part of a second carcass ply arranged axially on the outside relative to the first carcass ply, to the filler and to the turn-up;
a protective rubber and a sidewall rubber axially furthest toward the outside and forming a first interface between the protective rubber and the sidewall rubber; and
a communication module comprising a radiofrequency transponder with an electronic chip and a helical radiating antenna,
wherein an additional filler is positioned axially between the second carcass ply and the cushion gum and the sidewall rubber,
wherein a radially outer end of the additional filler extends radially further than a radially outer end of the filler,
wherein the communication module is positioned at a second interface between the second carcass ply and the additional filler,
wherein, with the turn-up having an end situated radially below the radially outer end of the filler, the communication module is positioned radially at a level of the end of the filler, and
wherein a radially outermost end of the first interface between the protective rubber and the sidewall rubber extends radially on the outside to the communication module.
2. The tire according to claim 1 , wherein, with the helical radiating antenna of the radiofrequency transponder defining a first longitudinal axis, the first longitudinal axis is oriented circumferentially.
3. The tire according to claim 1 , wherein, with the radiating antenna comprising two helical antenna segments, the electronic chip is galvanically connected to the two helical antenna segments.
4. The tire according to claim 1 , wherein the communication module consists of the radiofrequency transponder encapsulated in an electrically insulating encapsulating rubber mass.
5. The tire according to claim 4 , wherein the radiofrequency transponder is sandwiched between two sheets of rubber.
6. The tire according to claim 4 , wherein a tensile elastic modulus of the encapsulating rubber mass is lower than or equal to a tensile elastic modulus of adjacent rubber compounds.
7. The tire according to claim 4 , wherein a relative dielectric constant of the encapsulating rubber mass is lower than a relative dielectric constant of adjacent rubber compounds.
8. The tire according to claim 1 , wherein the radiofrequency transponder further comprises a primary antenna electrically connected to the electronic chip, wherein the primary antenna is inductively coupled to the helical radiating antenna, and wherein the helical radiating antenna is a dipole antenna consisting of a single-strand helical spring defining a first longitudinal axis.
9. The tire according to claim 8 , wherein the primary antenna is a coil having at least one turn defining a second longitudinal axis that is circumscribed by a cylinder an axis of revolution of which is parallel to the second longitudinal axis and a diameter of which is between one third and three times the average diameter of the helical spring of the helical radiating antenna.
10. The tire according to claim 9 , wherein, with the helical radiating antenna having a central region between two lateral regions and the primary antenna having a median plane perpendicular to the second longitudinal axis, the first and second longitudinal axes are parallel to one another and the median plane of the primary antenna is arranged in a central region of the helical radiating antenna.
11. The tire according to claim 8 , wherein the primary antenna is placed inside the single-strand helical spring of the helical radiating antenna.