Device for measuring operating variables of a tyre

Abstract

The invention relates to a device for measuring operating variables, which is to be fitted to a tyre, comprising: - an electronic circuit distributed over a first face of an electronic board and comprising sensors; - a protective casing covering at least partially the electronic circuit; and - at least one first antenna conductor having one end galvanically connected to the electronic circuit and extending integrally so as to project laterally from the casing. According to the invention, the casing comprises a lateral portion projecting substantially tangentially to the proximal portion of the first conductor according to the generatrix of said first conductor.

Description

TECHNICAL FIELD

[0001] The present invention relates to a device for measuring operating variables of a tyre of a vehicle, such as an aircraft. BACKGROUND

[0002] Typically, an aircraft wheel comprises a rim and a tyre received on the rim, the rim and the tyre delimiting an internal volume filled with a pressurised gas. Regulatory requirements provide that the pressure of the gas contained in the tyre must be measured at least once a day. If the tyre is underinflated, the aircraft is not allowed to take off and maintenance operations must be performed.

[0003] The pressure measurement of the gas contained in the tyre is usually performed manually using a pressure gauge connected to an inflation valve integral with the rim and in communication with the internal volume.

[0004] Tyres are known which are fitted with a pressure measurement device embedded inside the tyre to facilitate maintenance operations on the ground. The pressure measurement device collects digital data relating to the pressure of the gas contained in the tyre and transmits these data by radio waves to a reader arranged remotely, without the need to touch the tyre or perform any manual operations.

[0005] This pressure measurement device usually comprises a housing which extends around an electronic board provided with a pressure sensor and a radio transceiver. It also comprises a helical antenna which projects laterally from the housing, one end of which is galvanically connected to the radio transceiver, for example via welding or soldering.

[0006] During rotation of the tyre, the pressure measurement device is subjected to stresses and deformations which are transmitted to the antenna. The helical shape gives the antenna a certain flexibility which enables it to deform, thus improving its resistance to the stresses it is subjected to.

[0007] However, the stresses to which the antenna is subjected are concentrated at its end which is rigidly fixed to the electronic board. There is therefore a risk of the antenna breaking at its connection with the electronic board, which would on the one hand render its electronic functions inoperative and on the other hand risk damaging the tyre. SUMMARY

[0008] It is therefore an object of the present invention to propose a device for measuring operating variables of a tyre of a vehicle which makes it possible at least partially to prevent the problems mentioned above.

[0009] To this end, according to the invention, there is provided a measuring device comprising:

[0010] - an electronic circuit distributed on a first face of an electronic board and comprising a sensor;

[0011] - a protective housing which at least partially covers the electronic board;

[0012] - at least one first antenna wire having one end electrically connected to the electronic circuit and extending to project laterally from the housing.

[0013] According to the application, the housing comprises a lateral portion projecting according to the generatrix of said first wire substantially tangentially to the proximal portion of the first wire.

[0014] This lateral portion makes it possible to limit deformations during rotation of the tyre, and thus to limit stresses locally close to the end of the first wire connected to the electronic circuit. The durability of the first wire with respect to the stresses it is subjected to is improved, which makes it possible to limit the risk of breakage of the first wire at its connection to the electronic circuit.

[0015] In particular, the housing comprises a first portion partially covering the first face and a second portion partially covering a second face of the electronic board opposite the first face, the second portion having at least one bottom intended to extend close to the inner surface of the tyre.

[0016] In particular, the protective housing comprises at least one passage putting the electronic circuit in fluid communication with the outside of the housing.

[0017] In particular, the generatrix of the first wire is parallel to the first face.

[0018] In particular, the lateral portion comprises at least one finger substantially tangential to the proximal segment of the first wire in a plane perpendicular to the first face.

[0019] In particular, the first wire has a shape comprising in the following group: rectilinear, helical, curved, undulating.

[0020] In particular, the protective cover at least partially covers the electronic board, the housing and the first wire.

[0021] In particular, the protective cover is made of an elastomeric material.

[0022] In particular, the elastomeric material is crosslinked at a temperature lower than 100°C.

[0023] In particular, at least one segment of the first wire has a geometric pattern repeated according to a pitch P, the projection of which on a plane perpendicular to the generatrix of the first wire is defined in a circle of diameter D, such that P / D < 0.7.

[0024] In particular, the first wire comprises a first segment facing the lateral portion of the housing and having a first geometric pattern repeated according to a first pitch, and a second segment facing away from the lateral portion of the housing and having a second geometric pattern repeated according to a second pitch, the first pitch being greater than the second pitch.

[0025] In particular, the device comprises a second antenna wire, which comprises one end electrically connected to the electronic circuit and extends so as to protrude laterally from the casing, so as to form a dipole antenna with the first wire.

[0026] In particular, the present application also relates to a tyre comprising such a measuring device and an element for fixing the device to the inner surface of the tyre.

[0027] In particular, the fixing element is a patch covering the device and a portion of the device surrounding the device.

[0028] The present application also relates to a wheel comprising such a tyre.

[0029] The present application also relates to an aircraft landing gear comprising at least one such wheel.

[0030] The application will be better understood by reading the following description, given only by way of non-limiting illustration of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0031] With reference to the drawings, in which:

[0032] - Figure 1A is a perspective view of a pressure measuring device according to a first embodiment of the application;

[0033] - Figure 1B is a schematic cross-sectional view of a pressure measuring device shown in Figure 1A , housed in an elastomeric material;

[0034] - Figure 1C is a top view of an electronic board of a pressure measuring device shown in Figure 1A ;

[0035] - Figure 2 is a perspective view of a pressure measuring device shown in Figure 1B ;

[0036] - Figure 3 is a perspective view of a patch made of elastomeric material, which makes it possible to fix Figure 2 an overmoulded pressure measuring device shown in on the inner surface of a tyre;

[0037] Figure 4 - Figure 2 is a schematic cross-sectional view of an aircraft wheel provided with a pressure measuring device shown in Figure 3 , fixed on the inner surface of a tyre using a patch shown in ;

[0038] Figure 5A is a first example of a spring antenna for a pressure measuring device shown in Figure 1A ;

[0039] - Figure 5B is a second example of a spring antenna for a pressure measuring device as shown in Figure 1A

[0040] - Figure 6A is a perspective view of a variant of the pressure measuring device as shown in Figure 1A

[0041] - Figure 6B is a schematic cross-sectional view of the pressure measuring device as shown in Figure 6A

[0042] - Figure 7A is a perspective view of a pressure measuring device according to a second embodiment of the application;

[0043] - Figure 7B is a schematic cross-sectional view of the pressure measuring device as shown in Figure 7A

[0044] - Figure 8A is a perspective view of a variant of the pressure measuring device as shown in Figure 7A

[0045] - Figure 8B is a schematic cross-sectional view of the pressure measuring device as shown in Figure 8A DETAILED DESCRIPTION

[0046] With reference to Figure 1A , Figure 1B and Figure 1C , the pressure measuring device according to a first embodiment of the application, generally designated 1, comprises a phenolic shell 10 extending along a vertical axis Z, which is here mainly straight cylindrical. The shell 10 comprises a first portion 10.1 and a second portion 10.2, both arranged on either side of an electronic board 20 extending in a horizontal plane XY. The shell 10 thus delimits an enclosure in which the electronic board 20 extends at least partially.

[0047] The first portion 10.1 of the shell 10 delimits with a first face 20.1 of the electronic board 20 a first volume VI and forms a cover having a flat-shaped upper surface. The first portion 10.1 of the shell comprises a first channel 11 putting the first volume VI in fluid communication with the outside. The first channel has a circular cross-section with a diameter between 0.2 and 1.5 mm, preferably 1 mm.

[0048] ​​​​​​The second portion 10.2 of the housing 10 and the second surface 20.2 of the electronic board 20, which is opposite the first surface 20.1, define a second volume V2 and form a container with a flat bottom. The connection between the housing 10 and the electronic board 20 is arranged to enable relative movement between the housing 10 and the electronic board 20, for example, via a flexible silicone bead.

[0049] The electronic board 20 comprises a second channel (not shown here) which puts the first volume V1 in fluid communication with the second volume V2. The second channel has a circular cross section with a diameter between 100 and 300 microns, preferably 200 microns.

[0050] like Figure 1C As shown, the electronic circuit extends on a first face 20 . 1 of the electronic board 20 and comprises a passive pressure sensor 30 , a radio transceiver 31 and a microcontroller 32 .

[0051] A pressure sensor 30 , a radio transceiver 31 and a microcontroller 32 are mounted on the first face 20 . 1 of the electronic board 20 and extend into the first volume V1 .

[0052] The pressure sensor 30 includes a mechanical protective cap that defines a sealed measuring envelope. Here, the pressure sensor 30 is a piezoresistive sensor, comprising a membrane extending substantially parallel to the first face 20.1 of the electronics board 20. The sensor is an electromechanical microsystem (MEMS) with a Wheatstone bridge. A third channel (not shown here) spans the electronics board 20 and connects the envelope defined by the cap to the second volume V2. The third channel has a circular cross-section, with a diameter substantially equal to that of the second channel 21.

[0053] Electronics board 20 includes a first pair of arms 21.1 extending laterally from housing 10 along a horizontal axis X perpendicular to axis Z. The first pair of arms 21.1 internally form a first recess 22.1, which extends one end of a first antenna conductor 40.1, which is galvanically connected to radio transceiver 31. First conductor 40.1 is formed from a steel wire wound in a helical spring according to a pitch P and extends laterally from housing 10 along axis X. The projection of first conductor 40.1 onto plane YZ perpendicular to axis X is confined to a circle with a diameter D. A P / D ratio of less than 0.7 improves the antenna's transmission and reception performance and also reduces the stiffness of the helical conductor, thereby limiting stresses in first conductor 40.1, particularly at its galvanic connection to radio transceiver 31.

[0054] The electronic board 20 also comprises a second notch 22.2 formed by a second pair of arms 21.2 identical to the first pair of arms 21.1 and extending opposite said first pair of arms 22.1. The end of a second identical spring antenna wire 40.2 extends inside the second notch 22.2 and is galvanically connected to the radio transceiver 31. The first wire 40.1 and the second wire 40.2 are substantially identical and constitute a dipole antenna.

[0055] The second housing part 10.2 comprises a first lug 12.1 projecting along the axis X. The first lug 12.1 extends facing partly the first notch 22.1 and comprises a horizontal inner face portion 13.1 substantially tangential to the first section 41.1 of the first wire 40.1. Two first fingers 14.1 extend in parallel along the axis Z from the free ends of the inner face portion 13.1 extending beyond the first notch 22.1 and form a space for receiving the second section 42.1 of the first wire 40.1. The first fingers 14.1 comprise inner surfaces substantially vertically tangential to the second section 42.1 of the first wire 40.1.

[0056] The second housing part 10.2 also comprises a second lug 12.2 projecting identically to the first lug 12.1 and arranged opposite said first lug. The second lug 12.2 extends facing partly the second notch 22.2 and comprises a horizontal upper face portion 13.2 substantially tangential to the first section 41.2 of the second wire 40.2. Two second fingers 14.2 extend in parallel along the axis Z from the free ends of the upper face portion 13.2 extending beyond the second notch 22.2 and form a space for receiving the second section 42.2 of the second wire 40.2. The second fingers 14.2 comprise inner surfaces substantially vertically tangential to the second section 42.2 of the second wire 40.2.

[0057] The first lug 12.1 and the second lug 12.2 thus extend outside the envelope delimited by the housing 10.

[0058] The pitch of the second section 42.1 of the first wire 40.1 and of the second section 42.2 of the second wire 40.2 is respectively smaller than the pitch of the first section 41.1 of the first wire 40.1 and of the first section 41.2 of the second wire 40.2. This difference in pitch makes it possible to increase the number of contact points between the wires 40.2, 40.1 and the second housing part 10.2 during articulation of said wires 40.1, 40.2 in operation and thus to reduce the local stresses borne by the housing 10, in particular at the fingers 14.1, 14.2. This also makes it possible to create a certain flexibility at the second sections 42.1, 42.2 of the wires 40.1, 40.2 and thus to facilitate articulation of said wires 40.2, 40.1 while reducing the forces crossing at their galvanic connections to the radio transceiver 31.

[0059] If the increase in the pitch of the second segments 42.1, 42.2 makes it possible to improve the performance of the antenna in radio frequency, it also makes it possible to increase the rigidity of the wires 40.1, 40.2 and thus the forces at the cross of their current connection with the radio transceiver 31. The compromise between the mechanical strength and the performance of the antenna will then be confirmed according to the final use of the device 1.

[0060] As shown in Figure 2 Fig. 1, the device 1 is covered with a protective cover 50 made of an elastomer material, preferably cross-linked at a temperature lower than 100°C, such as a polysiloxane-based or silicone-based material, such as the silicone-based elastomer material named "Silicone". The protective cover 50 covers the first wire 40.1, the second wire 40.2, the housing 10 and the part of the electronic board 20 not covered by the housing 10.

[0061] The protective cover 50 electrically insulates the device 1 since the electrical conductivity of the elastomer material is less than the percolation threshold of its conductive charges, which improves the performance of the antenna in terms of emission and reception. The dielectric constant of the elastomer material is preferably less than 10, advantageously less than 6, very advantageously less than 3, such as in the case of "Silicone" whose dielectric constant is equal to 2.83.

[0062] In a preferred embodiment, the elastomer material is first deposited in a semi-liquid state on the housing 10 in order to facilitate the molding of the mechanical and electronic components of the device 1 and to enable the air to escape, in particular at the antenna wires 40.1, 40.2, the geometry of which favors the formation of air bubbles. Then, the elastomer material is hardened during a cross-linking step, preferably at a temperature lower than 100°C, in order to avoid any degradation of the electronic components. In the absence of air bubbles, the protective cover 50 is uniformly and tightly joined to the different mechanical and electronic components, which ensures the robustness of the antenna performance and the robustness of the anchoring of the mechanical and electronic elements within the protective cover 50.

[0063] Preferably, the anchoring of the mechanical and electronic components within the protective cover 50 is performed without adhesion phenomena in order to improve the durability of the protective cover 50, and thus of the device 1, by minimizing the stress concentration at the origin of the cracking phenomena. This anchoring is obtained by using a silicone-based elastomer such as "Silicone" which has a chemical inertia with respect to a large number of materials. The choice of the elastomer material depends on the material of the antenna wires 40.1, 40.2 with which the protective cover 50 will be in contact. For example, "Silicone" makes it possible to avoid this adhesion phenomenon where the antenna wires 40.1, 40.2 are entirely made of steel or have an external brass coating.

[0064] The protective cover 50 is arranged to completely enclose the device 1 and limit the deformation of the antenna conductors 40.1, 40.2 due to external forces on the device 1, in particular along the axis X. In fact, the elasticity of the elastomeric material enables the movement of the antenna conductors 40.1, 40.2 while limiting them and limiting the forces that penetrate said antenna conductors 40.1, 40.2. The cover thus makes it possible to reduce the articulation of the antenna with respect to the air and the abutment of the side portions and to provide other passages for the stresses and deformations caused by the forces exerted on the antenna in operation. Thus, by promoting the homogenization of the stresses over a greater surface, stress concentrations are avoided. By its elastomeric composition, the protective cover 50 makes it possible to reduce the stresses undergone by the conductors 40.1, 40.2, in particular at their electrical connection with the radio transceiver 31, and to disperse these stresses along the generatrices of said conductors 40.2, 40.1. The choice of an elastomeric material that crosslinks at ambient temperature enables the protective cover 50 to be incinerated in the presence of the electronic board 20 without degrading the electronic components that make up this protective cover.

[0065] As shown in Figure 4 , the device 1 thus protected is placed inside the wheel R of the aircraft.

[0066] The wheel R comprises a rim J on which a tyre P is mounted, which together define an internal volume V filled with pressurized air. In a known manner, a connecting patch 60 (as shown in Figure 3 ) made of elastomeric material makes it possible to fix the device 1 covered by the protective cover 50 on the inner surface of the tyre P, in particular on the edge of said tyre P. The patch covers a portion of the device 1 and of the inner surface around said device, while the bottom of the second portion 10.2 of the housing 10 extends near the inner surface of the tyre P. The material of which the patch 60 is made does not adhere to the material of which the protective cover 50 is made, which makes it possible to reuse the device 1, for example in another tyre.

[0067] The aircraft is equipped with a radio transceiver tuned to the transmission and reception frequencies of the radio transceiver 31 of the pressure measurement device 1.

[0068] In operation, the pressurized air contained in the internal volume V delimited by the rim J and the tire P penetrates into the first volume VI via the first channel 11 of the housing 10. The first channel 11 performs a first filtration of the particles at the input of the internal volume V. During the passage of the air from the first volume VI to the second volume V2, a second filtration of the air is performed by the second channel. The air present in the second volume V2 then penetrates into the capsule delimited by the cap of the pressure sensor 30 via the third channel and acts on the membrane. Under the effect of the air pressure in the capsule, the membrane deforms and the electrical resistance associated with said membrane changes. The analog-to-digital converter integrated in the microcontroller 32 converts the capacity of the condenser into a pressure value which is then transmitted to the radio transceiver of the aircraft using the radio transceiver 31 of the pressure measurement device 1.

[0069] During the rotation of the tire P, the first 12.1 and second 12.2 lugs of the housing 10 resist the deformation of the first 41.1, 41.2 and second 42.1, 42.2 sections of the wires 40.1, 40.2. They thus make it possible to limit the stress locally on the proximal ends of said wires 40.1, 40.2 which are in galvanic connection with the radio transceiver 31. The risk of breakage of the wires 40.1, 40.2 at their connection to the electronic board 20 is thus limited.

[0070] As the proximal end moves away from the wire 40.1, 40.2, it is advantageous to readjust the stiffness of said antennas by, for example, modulating the pitch of the helical shape of these antennas at the same winding diameter, in order to improve their performance in terms of emission and reception, without reducing their mechanical durability with respect to the stresses undergone. Figure 5A and Figure 5B The dimensional characteristics of the first and second versions of the straight winding wire 40.1, 40.2 are respectively illustrated, a good compromise between mechanical durability and emission / reception performance being provided here.

[0071] In the first version ( Figure 5A ), the wire 40.1, 40.2 has, for example, the following dimensional characteristics:

[0072] - the wire diameter d is equal to 0.225 mm;

[0073] - the outer winding diameter D is equal to 1.6 mm;

[0074] - the total winding length L is equal to 40.2 mm;

[0075] - the first section comprising one cusp, extending over a length LI, is equal to 1.1 mm;

[0076] - the second section comprising five cusps, extending over a length L2, is equal to 3.5 mm;

[0077] - the first section comprising one cusp extending over a length LI equal to 1.1 millimeter;

[0078] - the length of the straight end portion I equal to 5 millimeters.

[0079] In a second version (not shown), Figure 5B ) the wires 40.1, 40.2 have for example the following dimensional characteristics:

[0080] - the wire diameter d' equal to 0.225 millimeter;

[0081] - the outer winding diameter D' equal to 1.8 millimeter;

[0082] - the total winding length L' equal to 34.1 millimeter;

[0083] - the first section comprising one cusp extending over a length LI'equal to 1.1 millimeter;

[0084] - the second section comprising five cusps extending over a length L2' equal to 3.5 millimeter;

[0085] - the third section comprising thirty cusps extending over a length L3' equal to 27 millimeter;

[0086] - the length of the straight end portion I' equal to 5 millimeters.

[0087] In both examples, the first section and the third section have a P / D ratio less than 0.7. The P / D ratio of the second section is less than the P / D ratio of the first section and of the third section.

[0088] Figure 6A and Figure 6B a pressure measuring device 1'is shown, which is a variant of the device 1 shown. Figure 1A The device 1'differs from the device 1 in that the first lug 12.1'and the second lug 12.2' are carried by the first portion 10.1 of the housing 10 and not by the second portion 10.2 of the housing 10.

[0089] Figure 7A and Figure 7B a pressure measuring device 100 according to a second embodiment of the application is shown. The device 100 differs from the devices 1, 1'in that the first portion 10.1 and the second portion 10.2 of the housing 10 each comprise two protruding lugs 112.1, 112.1 ', 112.2, 112.2', which extend facing each other two by two.

[0090] Lugs 112.1', 112.2' comprise an outer surface extending from the upper portion of housing 10, while lugs 112.1, 112.2 comprise an outer surface extending from the bottom portion of housing 10. Lugs 112.1, 112.1', 112.2, 112.2' have no protruding fingers, and each lug comprises an inner surface extending horizontally and generally tangential to wires 40.1, 40.2.

[0091] Advantageously, the lugs 112 . 1 ′, 112 . 2 ′ comprise through holes forming the anchoring of the protective cover 50 to the housing 10 , the elastomeric material of the protective cover 50 not bonding to the resin of the housing 10 .

[0092] Figure 8A and Figure 8B A pressure measuring device 100 ′ is shown, which is Figure 7A A variation of the device 100 is shown. The pressure measuring device 100' differs from the device 100 in that the outer surfaces of the lugs 112.1', 112,2' extend a certain distance from the upper surface of the housing 10. The position of the device 1 in the protective cover 50 is also modified.

[0093] Of course, the invention is not limited to the embodiments described but covers any variant coming within the ambit of the invention as defined by the claims.

[0094] Although here the pressure measuring device comprises a phenolic resin housing, the invention is also applicable to other types of housings, such as metal or thermoplastic materials, carbon fiber, polycarbonate, PEEK, epoxy-based materials or other housings.

[0095] Although the housing is cylindrical here, the present invention is applicable to housings of other shapes, such as egg-shaped, rectangular box-shaped, or any other shape.

[0096] The antenna may be made of one or more metal wires wound into a spring.

[0097] Although here the first channel, the second channel and the third channel have circular cross-sections, the present invention is also applicable to first channels, second channels and / or third channels with different cross-sections, such as square or other cross-sections.

[0098] Although here the pressure measuring device comprises a microcontroller, the present invention is also applicable to other signal processing devices, such as FPGAs, logic gates or microprocessors.

[0099] The invention is applicable to any means for connecting components to electronic circuits, such as by wires, welding / soldering, broaching or sintering connections on a PCB type support.

[0100] Although here the pressure measuring device comprises a radio transceiver (for example of the "RFID" type), the application is applicable to any type of wireless transmission technology, for example "LoRa", "Sigfox", "NFC", "edge", "Wi-Fi", "Bluetooth", ultrasonic or "IoT" type 2G, 3G, 4G, 5G protocols. If it is necessary to power the transceiver, a battery should be integrated into the pressure measuring device.

[0101] Although here the measuring device is placed in the aircraft wheel, the application is also applicable to other vehicles, for example trucks or cars.

[0102] Although here the tire is filled with pressurized air, the application is also applicable to tires filled with other types of pressurized fluids, for example inert gases such as nitrogen.

[0103] Although here the pressure sensor is of the piezoresistive type, the application is also applicable to other types of pressure sensors, for example resistive, inductive, capacitive, piezoelectric or resonant sensors.

[0104] Although here the electronic board is connected to the housing by means of a bead of glue, the application is also applicable to other types of connection between the housing and the electronic board, for example one or more elastomer pins extending from a first surface of the electronic board to a first portion of the housing, and one or more elastomer pins extending from a second surface of the electronic board to a second portion of the housing. Furthermore, although here the electronic board is fixed to the housing using a bead of flexible glue based on silicon, the application is also applicable to other types of connection between the housing and the electronic board, enabling relative movement of the housing and the electronic board, for example synthetic or natural seals of the rubber or EPDM type.

[0105] The pressure measuring device can also comprise a temperature sensor for transmitting the temperature and / or performing temperature compensation of the measurements of the pressure sensor. The measurement of the temperature can be made by a dedicated sensor or also on the piezoresistive sensor by measuring the input resistance of the sensitive element or by any other combination of the resistances of the piezoresistive sensor, the result of which will only provide a temperature image of the pressure removed in the combination performed (the resistances working longitudinally or transversely give a positive and negative measurement factor, respectively).

[0106] For reasons of measurement redundancy, it is possible to consider placing several pressure measuring devices in the same tire.

[0107] The protective cover can only partially cover the first antenna and / or the second antenna.

[0108] Although here the first antenna wire 40.1 and the second antenna wire 40.2 are composed of a helical steel wire wound in a spring, they can also be composed of a wire made of a material other than steel and wound in a shape other than helical (rectilinear, undulating, curved, etc.).

[0109] The bottom of the housing can abut directly against the inner surface carrying the tyre, or indirectly via an interface such as a fixed or detached interface.

[0110] Although here the measuring device comprises a pressure and / or temperature sensor, it can also comprise any type of sensor enabling the measurement of an operating variable of the tyre, such as an angular position, a rotational speed, an acceleration, a magnetic field, a humidity, a rust, etc.

Claims

1. Device (1) for measuring operating variables, said device being fitted to a tyre (P) and comprising: - an electronic circuit, distributed on a first face (20.1) of an electronic board (20) and comprising a sensor (30); - a protective housing (10) delimiting an enclosure in which at least part of said electronic circuit extends; and - at least one first antenna wire (40.1, 40.2) having one end electrically connected to said electronic circuit, said first antenna wire extending entirely outside said enclosure so as to laterally protrude from said protective housing; said protective housing being provided with a protruding lateral portion (12.1, 12.2) which is tangent to a proximal section (41.1) of said first antenna wire according to a generatrix of said first antenna wire, but not tangent to the rest of said first antenna wire.

2. The device (1) according to claim 1, characterized in that said protective housing comprising a first portion (10.1) partially covering said first face (20.1) and a second portion partially covering a second face (20.2) of said electronic board opposite said first face, said second portion having at least one bottom intended to extend near an inner surface of said tyre.

3. The apparatus (1) according to claim 1 or 2, characterized in that said protective housing (10) comprising at least one channel (11) which puts said electronic board in fluid communication with the outside of said protective housing.

4. The apparatus (1) according to claim 1 or 2, characterized in that said generatrix of said first antenna wire (40.1) is parallel to said first face (20.1).

5. The apparatus (1) according to claim 1 or 2, characterized in that said lateral portion (12.1, 12.2) comprises at least one finger (14.1) which is substantially tangent to said proximal section (41.1) of said first antenna wire (40.1) in a plane perpendicular to said first face (20.1).

6. The apparatus (1) according to claim 1 or 2, characterized in that said first antenna wire (40.1) has a shape comprised in the group consisting of: rectilinear, helical, curved, undulating.

7. The apparatus (1) according to claim 1 or 2, characterized in that said device comprises a protective cover (50) which at least partially covers said electronic board (20), said protective housing (10) and said first antenna wire (40.1).

8. The device (1) according to claim 7, characterized in that said protective cover (50) is made of an elastomeric material, such as a silicone-based elastomer.

9. The device (1) according to claim 8, characterized in that said elastomeric material is cross-linked at a temperature lower than 100°C.

10. The apparatus (1) according to claim 1 or 2, characterized in that at least one section of said first antenna wire (40.1) has a geometric pattern which is repeated according to a pitch P, the projection of said geometric pattern on a plane perpendicular to the generatrix of said first antenna wire being defined in a circle having a diameter D, so that P / D < 0.

7.

11. The device (1) according to claim 10, characterized in that said first antenna wire (40.1) comprises a first section facing said lateral portion (12.1) of said protective housing (10) and having a first geometric pattern which is repeated according to a first pitch, and a second section facing away from said lateral portion of said protective housing and having a second geometric pattern which is repeated according to a second pitch, said first pitch being greater than said second pitch.

12. The apparatus (1) according to claim 1 or 2, characterized in that Said device comprises a second antenna wire (40.2) comprising one end electrically connected to said electronic circuit and extending to project laterally from said protective housing (10) so as to form a dipole antenna with said first antenna wire (40.1).

13. Tyre (P) comprising a device (1) according to any one of the preceding claims and elements (60) for fixing said device on an internal surface of said tyre.

14. A tyre (P) according to claim 13, characterized in that, Said fixing elements (60) are patches covering a portion of said device (1) and said internal surface around said device.

15. Wheel (R) comprising a tyre (P) according to claim 13 or 14.

16. Aircraft landing gear comprising at least one wheel (R) according to claim 15.

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