Safety insert with incorporated transmission antenna
A safety insert comprising a substantially circumferential base intended to come into contact with an adapted wheel rim, a substantially circumferential body intended to support a tread of a tire mounted on the rim during rolling with a pressure capable of causing at least partial flattening of a portion of the tire, and a housing intended to receive a wheel unit, characterized in that the safety insert comprises an aerial which is rigidly connected to the insert and is disposed inside its volume.
1. A safety insert ( 3 ) intended to support a tread of a tire ( 1 ) mounted on a wheel rim during rolling with a pressure capable of bringing about at least partial flattening of a portion of the tire, comprising:
a substantially circumferential base ( 8 ) intended to come into contact with the wheel rim ( 2 ),
a substantially circumferential annular body ( 9 ) and a housing ( 19 ) intended to receive a wheel unit ( 20 ) comprising a radio transmitter ( 25 ) connected to a first magnetic coupling winding ( 21 ),
said safety insert ( 3 ) further comprising an aerial ( 14 ) rigidly connected to the insert ( 3 ) and a second magnetic coupling winding ( 15 ) disposed in the safety insert, wherein said second magnetic coupling winding ( 15 ) is proximate to the housing ( 19 ) of the wheel unit.
2. The safety insert ( 3 ) according to claim 1 , wherein, said aerial ( 14 ) is a high-output tuned aerial.
3. The safety insert ( 3 ) according to claim 2 , wherein said aerial ( 14 ) extends over a fraction of the circumference of the insert.
4. The safety insert ( 3 ) according to claim 2 , wherein said aerial extends over the entire circumference of the insert.
5. The safety insert ( 3 ) according to claim 1 , wherein, the annular body ( 9 ) having a part of a diameter larger than the maximum diameter of the wheel intended to receive the insert, wherein a majority of said aerial is disposed within said upper part of said annular body.
6. The safety insert ( 3 ) according to claim 5 , wherein the aerial ( 14 ) is fixed in an annular groove ( 13 ) formed in a lateral wall of the upper part of the insert.
7. The safety insert ( 3 ) according to claim 5 , wherein the aerial ( 14 ) is immersed in the annular body ( 9 ) of the insert.
8. The safety insert ( 3 ) according to claim 1 , wherein the coupling winding ( 15 ) of the aerial ( 14 ) is immersed in the base ( 8 ) of the insert.
9. The safety insert ( 3 ) according to claim 1 , wherein the aerial ( 14 ) and the coupling winding ( 15 ) of the aerial are formed by a single conducting wire.
10. The safety insert ( 3 ) according to claim 1 , wherein the aerial ( 14 ) is formed, at least in part, of a conductive paint applied to the surface of the insert.
11. The safety insert ( 3 ) according to claim 1 , wherein the aerial ( 14 ) is formed with a flexible conductor.
12. The safety insert ( 3 ) according to claim 1 , wherein the housing ( 19 ) of the wheel unit ( 20 ) is disposed in the annular body with immediate proximity to the base ( 8 ) of the insert.
13. The safety insert of claim 1 further comprising the wheel unit.
14. A wheel unit ( 20 ), intended to be disposed in a housing ( 19 ) inside a safety insert ( 3 ) comprising a substantially circumferential base ( 8 ) intended to come into contact with an adapted wheel rim ( 2 ), a substantially circumferential body ( 9 ) intended to support a tread of a tire ( 1 ) mounted on the rim during rolling with a pressure capable of causing at least partial flattening of a portion of the tire, the unit ( 20 ) comprising an element ( 23 ) capable of detecting or reading a physical parameter of the wheel or tire, such as a pressure sensor, and a transmitter ( 25 ) connected electrically to a magnetic coupling winding ( 21 ) adapted to co-operate electrically with an aerial ( 14 ) disposed in the insert.
15. The wheel unit ( 20 ) according to claim 14 co-operating electrically with an electric power element ( 22 ).