Tyre having a member with an offset antenna
View Patent ↗A motor-vehicle tire includes a sidewall and a member with an electronic device, a generally and substantially linear-shaped rectilinear wire antenna, and means of electrical connection between the wire antenna and the electronic device. The member is embedded in the sidewall in an arrangement such that the antenna is oriented circumferentially with respect to the tire and the connection means is oriented in a radial direction of the tire. The wire antenna is integrally offset radially on one side of the electronic device.
1. A motor-vehicle tyre, comprising:
a sidewall;
a carcass ply that includes metal wires; and
a member that includes:
an electronic device,
a generally linear-shaped rectilinear wire antenna, and
an electrical connector that connects the wire antenna and the electronic device,
wherein the member is embedded in the sidewall in an arrangement such that the antenna is oriented circumferentially with respect to the tyre,
wherein the electrical connector is oriented in a radial direction of the tyre such that the electrical connector is substantially parallel to the metal wires of the carcass ply, and
wherein the wire antenna is offset radially on one side of the electronic device.
2. The tyre according to the claim 1 , wherein the antenna is helical.
3. The tyre according to claim 1 or claim 2 , wherein the electrical connector includes at least one helical conductor that produces an inductance.
4. The tyre according to claim 3 , wherein the helical conductor has an impedance that is equal to a predetermined value based on the wire antenna and the electronic device.
5. The tyre according to claim 1 , wherein the electrical connector is connected to the electronic device at a central zone of the electronic device relative to a circumferential extension thereof.
6. The tyre according to claim 1 , wherein
the sidewall includes a bead in a radially internal portion,
the electronic device is embedded in the sidewall in a vicinity of the bead, and
the antenna is offset in a direction radially external to the tyre.
7. The tyre according to claim 6 ,
wherein the tyre further comprises:
at least one annular bead wire of revolution about a reference axis; and
a carcass ply of generally toroidal shape, the carcass play being coaxial with the bead wire and including a folded portion that is folded around the bead wire,
wherein the member is in a plane extending radially, travelling away from a reference axis, from a free edge of the folded portion of the carcass ply to a circumferential line of junction between the plane and the carcass ply.
8. The tyre according to claim 7 , wherein the electronic device is at a distance of between 2 mm and 3 mm from the free edge of the folded portion.
9. The tyre according to claim 1 , wherein the member is located at an interface between two masses of rubber of the tyre.
10. The tyre according to claim 1 , wherein
the sidewall includes a shoulder in a radially external portion of the tyre,
the electronic device is embedded in the sidewall in a vicinity of the shoulder, and
the antenna is offset in a direction that is radially internal to the tyre.
11. The tyre according to claim 1 , wherein the electronic device is an RFID type of device.
12. The tyre according to claim 1 , wherein the offset radially of the antenna relative to the electronic device is between two and five times a length of the electronic device in a direction circumferential to the tyre.
13. The tyre according to claim 1 ,
wherein the tyre further comprises a carcass ply, and
wherein the antenna is situated at least two mm from the carcass ply.
14. The tyre according to the claim 1 , wherein the electrical connector extends in a direction that is substantially orthogonal to a main direction of the antenna.