Tire comprising a piezoelectric composite
A tire ( 1 ) for a vehicle comprises two sidewalls ( 3 ) and a crown ( 2 ) that is connected to the two sidewalls ( 3 ). The tire ( 1 ) comprises at least one insert ( 11, 12 ) which includes force detection means and which extends in a limited manner along one of the sidewalls ( 3 ) or the crown ( 2 ).
1. A tire for a vehicle, the tire comprising two sidewalls and a crown connected to the two sidewalls and comprising at least one insert extending in a limited way along one of the sidewalls or the crown, the insert comprising a rubber composition based on:
more than 50 parts by weight, per hundred parts by weight of elastomer, phr, of diene elastomer;
a crosslinking system; and
at least 5% by volume, with respect to a total volume of the rubber composition, of piezoelectric inorganic fillers,
wherein the insert is 4 mm thick,
wherein a piezoelectric coefficient of the rubber composition does not significantly vary for deformations of the insert between 0% and 35%, and
wherein the crown and the sidewalls define a cavity, the at least one insert being adhesively bonded in the cavity.
2. The tire according to claim 1 , wherein the at least one insert is embedded in a body of a material forming the crown, the sidewalls or both the crown and sidewalls.
3. The tire according to claim 1 , wherein the rubber composition comprises from 5% to 80% of piezoelectric inorganic fillers by volume, with respect to the total volume of rubber composition.
4. The tire according to claim 1 , wherein the piezoelectric inorganic fillers are piezoelectric ceramics.
5. The tire according to claim 1 , wherein the rubber composition of the at least one insert forms at least one layer P inserted between two conductive composite layers E, each layer E forming an electrode, each layer E being a rubber composition based on:
at least 50 phr of diene elastomer;
a crosslinking system; and
conductive fillers.
6. The tire according to claim 5 , wherein, in one or each layer E, the conductive fillers are graphitized or partially graphitized carbon black.
7. The tire according to claim 1 , wherein the at least one insert is located at a predefined position along one of the sidewalls or the crown.
8. The tire according to claim 7 , wherein the at least one insert comprises at least one first insert extending along the crown.
9. The tire according to claim 8 , wherein the at least one insert comprises a single first insert.
10. The tire according to claim 7 , wherein the at least one insert comprises at least one second insert extending along one of the sidewalls.
11. The tire according to claim 10 , wherein the at least one insert comprises a plurality of second inserts each arranged in a different angular sector of the sidewall.
12. The tire according to claim 11 , wherein the second inserts are distributed uniformly along the sidewall.
13. A tire for a vehicle, the tire comprising two sidewalls and a crown connected to the two sidewalls and comprising at least one insert extending in a limited way along one of the sidewalls or the crown, the insert comprising a rubber composition based on:
more than 50 parts by weight, per hundred parts by weight of elastomer, phr, of diene elastomer;
a crosslinking system; and
at least 5% by volume, with respect to a total volume of the rubber composition, of piezoelectric inorganic fillers,
wherein the insert is 4 mm thick,
wherein a piezoelectric coefficient of the rubber composition does not significantly vary for deformations of the insert between 0% and 35%,
wherein the tire exhibits an axis of revolution and successively comprises, along a radial direction perpendicular to the axis of revolution, an inner layer and an outer layer, the outer layer exhibiting, at the crown, a tread intended to be in contact with a roadway and the inner layer being arranged on an underside of the outer layer, the at least one insert being arranged in the inner layer, in an interface region of the inner layer and the outer layer, or in both the inner layer and in the interface region, and
wherein the at least one insert is adhesively bonded to a reinforcing ply arranged at an interface between the inner layer and the outer layer.
14. The tire according to claim 13 , wherein the at least one insert is embedded in a body of a material forming the crown, the sidewalls or both the crown and sidewalls.
15. The tire according to claim 13 , wherein the at least one insert is located at a predefined position along one of the sidewalls or the crown.
16. The tire according to claim 15 , wherein the at least one insert comprises at least one first insert extending along the crown.
17. The tire according to claim 16 , wherein the at least one insert comprises a single first insert.
18. The tire according to claim 15 , wherein the at least one insert comprises at least one second insert extending along one of the sidewalls.
19. The tire according to claim 18 , wherein the at least one insert comprises a plurality of second inserts each arranged in a different angular sector of the sidewall.
20. The tire according to claim 19 , wherein the second inserts are distributed uniformly along the sidewall.