Device for attaching an electronic component to a tyre casing

Abstract

The invention relates to an electronic system (1000) comprising a component (10) and a retaining device (510), said device (510) comprising: - a sole (511), - a retaining wall (512) extending from the sole (511) to an edge (513) and defining an open volume (520) accommodating the component (10), - said volume (520) having an opening (516) delimited by the edge (513); said component (10) comprising a housing (12) circumscribed in a cylinder (17) having an axis of revolution (15); and characterized in that the radial extension of the wall (512) from a closed line (530) to the edge (513) is between 25% and 35% of the radial distance (r530) of said line (530), in that the housing (12) comprises a cliff (50), and in that the cliff (50) extends along the axis of revolution (15) over a distance greater than the thickness of the wall (512).

Description

DEVICE FOR FIXING AN ELECTRONIC COMPONENT TO A PNEUMATIC ENCLOSURE Field of invention

[0001] The present invention relates to devices for attaching an electronic component to a pneumatic casing for the purpose of conveying identification information on the pneumatic casing or physical parameters of the pneumatic casing measured by the electronic component during the life of the pneumatic casing. Technological background

[0002] The development of electronic objects in pneumatic casings makes it possible to make pneumatic casings connectable and connected, which leads to the development of new services in order to optimize, for example, the use of the pneumatic casing. However, these electronic components sometimes contain thermomechanically fragile components, which requires the introduction of the electronic component in post-manufacturing of the pneumatic casing. Thus, the introduction of a fixing device as an interface between the electronic component and the tire has emerged. These fixing devices are generally elastic so as not to strongly constrain the pneumatic casing, to follow the strong deformations undergone by the pneumatic casing during its use and to absorb the stresses transmitted to the electronic component.One of the most commonly used device designs is a patch having a sole plate for attaching the pneumatic casing and having a self-closing wall extending from the sole plate to an opening. The wall serves to grip or hold the electronic component in position within the device, the electronic component being tightly mounted within the wall, which deforms elastically. The opening allows the electronic component to be inserted and removed from the patch due to the elasticity of the material of the opening.

[0003] Document W02018 / 150141A1 illustrates a patch of this nature. Although this patch specifically has a clamping system to limit the opening, it is in all respects consistent with a patch for fixing to a pneumatic casing of an electronic object. And, this type of patch sometimes presents a problem of mechanical strength of the system comprising the patch and the electronic component during use of the pneumatic casing on which this system is fixed. Particularly under high-speed driving conditions, the forces generated at the patch and the electronic component due to the change in the radius of curvature at the moment when the sector of the tire where the patch is fixed enters or leaves the contact area are significant. This sometimes leads to such a deformation of the fixing patch that the electronic component mounted inside the patch is at least partially removed from the patch receiving cavity, which ultimately leads to the ejection of the electronic component from the patch. This ejection of the electronic component, generally destructive for the electronic component, can also alter the very structure of the tire by the projection of the electronic component onto the walls of the tire, particularly at high speed.

[0004] The following objects of the invention aim to solve the problems of ejecting the electronic member from the fixing patch in a way that is economical, reliable and has no impact on the operation of the electronic member housed within the fixing patch. Description of the invention

[0005] The invention relates to an electronic system comprising an electronic member and a device for retaining the electronic member capable of being fixed to a wall of a pneumatic envelope, said retaining device comprising: • a sole capable of being fixed to the wall of the pneumatic casing via an external surface, • a closed retaining wall, capable of retaining said electronic component, extending from the sole to a free edge and defining with said sole an open volume, • said volume, capable of accommodating at least a part of said electronic member, being defined by an internal surface of said sole and by an internal surface of said retaining wall, having an opening delimited by the free edge of said retaining wall, capable of deforming to introduce said electronic member into said volume; said electronic member comprising a protective housing defining an external surface circumscribed in a cylinder whose axis of revolution is perpendicular to the median plane of the external surface of the sole of said retaining device and delimited by two parallel planes; and characterized in that the free edge of the retaining wall extends radially towards the axis of revolution of the cylinder circumscribed to the outer surface of the protective casing from a closed line of the distal retaining wall of the sole according to the axis of revolution whose points have a tangent vector which has a principal component according to the radial direction of the cylindrical reference frame associated with the cylinder, in that the radial extension of the retaining wall to each point of the free edge is carried out over a distance between 25% and 35% of the radial distance of the closed line located in the same radial plane, in that the outer surface of the protective casing comprises a first cliff located radially inside the projection of the free edge of the retaining wall on the outer surface according to the direction of the axis of revolution, in that a part of the first tangent cliff, on an angular sector,the projection of the free edge onto the outer surface and in that the first cliff having its main component in the direction of the axis of revolution extends in the direction of the axis of revolution over a distance greater than twice the thickness of the retaining wall at the free edge in said direction.,

[0006] Such a fixing device makes it possible to address the technical problem posed since the dimension of the radial extension is controlled, which ensures a certain level of bending and therefore ensures control of the deformation of the opening of the patch which does not allow easy ejection of the electronic member from the fixing device. In addition, the dimensioning of the radial extension also controls the dimension of the opening delimited by the free edge, which forces the electronic member to remain inside the open volume. And, the presence and dimensioning of the cliff on the protective housing of the electronic member limits the deformation of the holding wall which then forces the electronic member to remain inside the open volume of the fixing device.However, the extraction of the electronic component remains possible by means of an external tool which previously enlarges the opening of the retaining wall by applying a specific uniform force over the entire free edge to reduce the radial extension of the retaining wall. During use of the tire and even at high speed, such a force cannot be applied to the system due to the absence of the tool in the tire and the specificity of the external force applied to the system at the time of impact when entering the contact patch of the angular sector of the tire on which the electronic system is fixed which cannot be uniform over the entire free edge of the retaining wall.

[0007] Advantageously, the first cliff is tangent to the projection of the free edge of the retaining wall on the outer surface along the axis of revolution over at least one third of the entire curvilinear length of the projection of the free edge on the outer surface.

[0008] Very advantageously, the first cliff is tangent to the projection of the free edge of the retaining wall on the outer surface following the axis of revolution over at least half of the entire curvilinear length of the projection of the free edge on the outer surface.

[0009] Preferably, the first cliff is tangent to the projection of the free edge of the retaining wall on the outer surface along the axis of revolution over the entire curvilinear length of the projection of the free edge on the outer surface.

[0010] By requiring that the first cliff of the electronic component's protective casing and the free edge of the retaining wall touch over at least one third of the curvilinear length of the free edge, the movement of the electronic component relative to the fixing device is limited, since contact occurs immediately or with a delay depending on the displacement imposed between the two objects. One third of the curvilinear length represents, for a continuous and closed free edge, an angular sector of at least 120 degrees. Even if the relative displacement of the two objects does not directly lead to the meeting between the first cliff and the free edge, this meeting will take place over a large sample of relative displacement between the two objects. When this meeting takes place, a contact force occurs which opposes this displacement, which contributes to retaining the electronic component within the cavity of the fixing device.When the contact area between the first cliff and the free edge of the retaining wall increases angularly until it is complete, this accentuates the level of retention of the electronic organ within the open volume of the fixing device.

[0011] In a specific embodiment, the electronic member comprising the following elements: • a radio transmitter / receiver coupled to at least one radio antenna; a microprocessor located on a printed circuit, coupled to the radio transmitter / receiver and powered by an energy source, said elements are encapsulated in the protective casing.

[0012] The electronic component here comprises a radiofrequency transponder, i.e. it comprises radiofrequency communication components in transmission / reception to capture an order and respond to this order. Here the radiofrequency transponder is active, i.e. it comprises an energy source used mainly to transmit the response by radiofrequency communication. Indeed, radiofrequency transmission is an energy-intensive functionality for voluminous responses, such as, for example, the transmission of measurement or calculation data. For the calculation functionality, the microprocessor has more or less sophisticated calculation capabilities to process measurement data coming from a measurement sensor, for example, connected to the microprocessor.It should be noted that the energy source, which may be, for example, a battery, may be bulky but also massive, which results in significant centrifugal forces and significant impact forces which may cause the electronic component to be accidentally ejected from the fixing device.

[0013] The invention also relates to an arrangement of an electronic system and a pneumatic casing being able to rotate around an axis of rotation, said pneumatic casing comprising a top (S), two flanks (F) extending from the top (S) and ending in two beads (B) able to be linked to a wheel, in which the electronic system is fixed by means of the external surface of the sole of the retaining device on one of the surfaces of the pneumatic casing, preferably on the radially internal surface of the pneumatic casing.

[0014] Advantageously, the electronic system is fixed on the radially inner surface of the pneumatic casing and at the top (S) of the pneumatic casing.

[0015] This arrangement is the final destination of the electronic system which is the first object of the invention. Since the electronic system comprises an electronic component, this electronic component cannot be installed within the raw blank of the tire. Indeed, the electronic component would not withstand the thermomechanical constraints associated with the manufacturing process of a tire. Usually, it is preferable to install the electronic system after manufacturing the tire. Therefore, this electronic system is positioned on one of the surfaces, which are by nature external, of the tire. Preferably, the electronic system is positioned on the surface radially inner side of the tire casing relative to the natural axis of rotation of the tire casing. Thus, the electronic component is protected, in use condition on the tire casing, by the rubber structure of the tire casing, which improves the mechanical endurance of the electronic component. The positioning at the top allows easy access to measurement characteristics via a sensor of the electronic component associated with the contact area, which makes it possible to trace back to usage characteristics of the tire such as the static load applied, the rolling speed.

[0016] Preferably, the pneumatic casing being able to rotate around the axis of rotation in a main direction corresponding to a direction of movement relative to the ground of a vehicle equipped with said arrangement in forward motion, the barycenter of the points of the first cliff of the protective housing of the electronic component tangent to the projection of the free edge of the retaining wall on the outer surface is positioned behind the axis of revolution of the cylinder circumscribed to the protective housing of the electronic component in the direction of movement of the vehicle when the electronic system is located entirely in an angular sector of the pneumatic casing in contact with the ground.

[0017] In the case of using the tire in forward gear which can be carried out at very high rolling speed, the positioning of the part of the first cliff of the protective housing tangent to the free edge of the retaining wall relative to the axis of revolution of the cylinder circumscribed to the protective housing guarantees that the contact between the free edge and the first cliff will take place immediately at the level of entry into the contact area. As a result, the reaction force exerted by this contact will oppose the ejection of the electronic member of the fixing device. This is particularly true for cases where the tangency between the two elements, the first cliff and the free edge, is not ensured over the entire curvilinear length of the free edge.Thus, the orientation of the electronic system in the pneumatic envelope when it is positioned at the top (S) of the pneumatic envelope is an influential factor in the non-ejection of the electronic component, particularly at very high speed. Driving at high and very high speed on the vehicle is carried out in forward motion.

[0018] Here, the expression "behind" means that the two points are spaced by a distance d in the said direction and that this distance d can be zero.

[0019] Very preferably, the median plane of the part of the first cliff, tangent to the projection of the free edge of the retaining wall on the outer surface, delimiting the angular sector of the part of the first cliff into two equal angular sectors in the cylindrical reference frame associated with the cylinder circumscribed to the protective casing of the organ, has its normal having a principal component according to the rotational axis of the pneumatic envelope, preferably its normal is collinear with the rotational axis of the pneumatic envelope.

[0020] In order to ensure that the technical solution envisaged for retaining the electronic component of the fixing device is effective in all types of vehicle usage conditions, in particular when the pneumatic casing is mounted on a wheel of the vehicle's steering axle, it is preferable to angularly center the part of the first cliff tangent to the free edge so that contact occurs both in a straight line and when turning right or turning left. Brief description of the drawings

[0021] The invention will be better understood on reading the following description, given solely by way of non-limiting example and made with reference to the appended figures in which the same reference numbers designate identical parts throughout and in which: • Fig. 1 shows a perspective view of an electronic component, capable of being attached to a tire by means of a retaining device, of the state of the art; • Fig. 2 shows a sectional view of the radial plane of the electronic system according to one embodiment of the invention; • Fig. 3 shows a top view of the electronic system for the same embodiment of the invention, i.e. from the side of the opening of the cavity of the retaining device; • Fig. 4 shows a perspective and sectional view of a pneumatic envelope equipped with an electronic system according to the invention. Detailed description of embodiments

[0022] Fig. 1 is a perspective view of an electronic member 10, capable of being fixed using a retaining device to a pneumatic casing, of the state of the art.

[0023] The electronic component 10, shown here in gray, is delimited by a protective housing 12 encapsulating all of the electronic components of the electronic component 10. This protective housing 12 has an outer surface 30 circumscribed by a cylinder 17 having an axis of revolution 15 which is perpendicular to the printed circuit of the electronic component 10. This cylinder 17, having an axis of revolution 15, is truncated by two parallel planes 16 and 16' which rest respectively on the axially outer surfaces 14 and 14' of the protective housing 12.

[0024] This protective housing 12 is presented as the combination of a cone and a parallelepiped. The conical shape facilitates its insertion or extraction from a retaining device. The cone has on one of its axially outer surfaces a parallelepiped which accommodates the radio antenna. This is also encapsulated in the protective housing 12. The protective housing 12 is a monolithic part or a part assembled in several parts, the parts then being welded together.

[0025] The parts or the monolithic part are obtained for example using a molding process from a plastic material such as a thermoset. The low temperature cooking of the plastic results in the final production of the outer surface 30 of the protective housing 12.

[0026] Fig. 2 is a sectional view of the radial plane of an electronic system 1000 according to one embodiment of the invention.

[0027] The electronic system 1000 consists of an electronic member 10 and a retaining device 510 intended to be fixed to the wall of a pneumatic envelope.

[0028] The retaining device 510 comprises a sole 511 capable of being fixed to the wall of a pneumatic casing by means of an external surface and a closed retaining wall 512 whose function is to retain said electronic member 10. The retaining wall 512 extends from the sole 511 to a free edge 513, thus defining with the sole 511 a volume 520. This volume 520 is open, thus allowing the insertion and extraction of the member electronics 10 within the volume 520. The volume 520 is delimited by the internal surface 515 of the retaining wall 512 and the internal surface 514 of the sole 511. The opening 516 of the volume 520 is delimited by the free edge 513 of the retaining wall 512. This opening 516 is capable of deforming to allow the insertion and extraction of the electronic member 10 within the volume 520.

[0029] As in Fig 1, the electronic member 10 comprises a protective housing 12 encapsulating all of the electronic components. This protective housing 12 defines an external surface 30. This external surface 30 is circumscribed in a cylinder whose axis of revolution 15 is perpendicular to the median plane of the external surface of the sole 511. The circumscribed cylinder is truncated by two parallel planes, the first of which is similar to the internal surface 514 of the sole 511 and the second plane is located axially external to the opening 516 of the retaining device 510.

[0030] The retaining wall 512 extends axially from the sole 511 to the free edge 513. The part of the retaining wall 512 comprising the free edge 513 has a predominantly radial rather than axial extension in order to constitute a retaining lip for the electronic member 10. One of the ends of the lip is the free edge 513. The other end 530 is a closed line whose points have a vector tangent to the closed line having a predominant component in the radial direction relative to the axis of revolution 15. The radial extension of the lip thus formed extends from the closed line 530 to the free edge 513 over a distance r comprised between 25% and 35% of the radial distance rsso of the closed line 530 relative to the axis of revolution 15.The radial length of the lip contributes to maintaining the electronic member 10 within the retaining device during rolling at high speeds when the system 1000 is fixed to the wall of a pneumatic casing. However, this radial length is in association with another characteristic of the electronic system to fully ensure this maintaining function.

[0031] Indeed, the protective housing 12 here has a cliff 50 extending externally to the volume 520 of the retaining device 510. This cliff 50 has its main component which extends in the direction of the axis of revolution 15. The axial extension “h” of the cliff is greater than twice the thickness “e” of the retaining wall 512 at the free edge 513. This condition of distance of the axial extension of the cliff 50 guarantees a positioning of the electronic member 10 relative to the opening 516 of the retaining device, which ensures better retention of the electronic member 10 within the retaining device 510. In addition, this cliff 50 must be located partly in the immediate vicinity of the free edge 513 of the lip defined by the retaining wall 512. Therefore, it must be ensured that the projection 517 of the free edge 513 in the axial direction 15 on the external surface 30 of the projection housing is tangent to the cliff 50 of the electronic member. Thus, the positioning of the electronic member 10 within the retaining device 510 is even more constrained at least for a movement in a direction perpendicular to the line of tangency in an axial plane.Finally, to increase the potential blocking directions, it is appropriate that the tangency between the cliff 50 and the projection 517 of the free edge 513 on the external surface 30 is achieved over an angular sector around the axis of revolution 15. Here, the tangency is ensured over 180 degrees, which constrains the relative movement of the electronic member 10 within the retaining device 510 over half of the possible movements. For applications on tires of a steering axle, a sector of 120 degrees is desirable to prevent cornering situations with a possibly optimized positioning of the electronic system 1000 within the tire.

[0032] The combination of the presence of the cliff 50 on the external surface 30 of the electronic member 10 and the dimensioning of the lip defined by the retaining wall guarantees that the electronic member 10 is not accidentally ejected from the retaining device 510 in normal use at high speeds when the electronic system 1000 is installed on a tire of a motor vehicle.

[0033] Fig. 3 is a top view of the electronic system 1000 of Fig. 2. That is to say, externally to the electronic system 1000, it is observed towards the side of the opening of the volume of the retaining device 510 in the axial direction.

[0034] From the radial periphery of the electronic system 1000, we first visualize the axially outer edge of the sole 511 which is here circular, the outer edge of the sole 511 could also be elliptical or quadrilateral. We then visualize a first circle 529 which corresponds to the separation between the sole 511 and the holding wall 512 which is characterized by a change in curvature and the material points of this circle 529 have a tangent whose main component is axial. Then we visualize a circle 530 corresponding to the closed line of the retaining wall 512 which represents one end of the annular lip of the retaining wall 512. This lip ends with a second circle 513 which represents the free edge of the retaining wall 512. Then, between the circles 530 and 513, we find the dotted circle 17 corresponding to the radially outer surface of the circle circumscribed to the outer surface of the protective housing 12 of the electronic member 10.

[0035] Through the opening delimited by the circle 513, two semicircles 51 and 52 are observed here corresponding to the axial ends of the cliff 50 of the protective housing 12 of the electronic member 10. Thus, this cliff 50 is predominantly but not exclusively axial. The circle 51 is tangent to the circle 513 over the entirety of its semicircle, thus sweeping an angular sector of 180 degrees around the axis of rotation of the circumscribed cylinder 17 at the external surface of the protective housing 12. Here, the angular sector is separated into two angular sectors of 90 degrees each by the median plane 55 whose normal is collinear with the vector V. For reasons of understanding, this top view is defined in an axial plane (U, V) whose normal corresponds to the axis of revolution of the circumscribed cylinder 17.Once the electronic system 1000 is fixed to the wall of a tire, it is preferable that the local vector U of the electronic system of Fig. 3 corresponds to the direction vector of the circumferential direction of the cylindrical reference frame associated with the tire around its natural axis of rotation. Thus, once mounted on the vehicle, the part of the cliff 50 tangent to the free edge 513 of the retaining wall is located behind the axis of revolution 15 of the electronic system 1000 when the tire rolls on the roadway in the “forward” mode of the vehicle. This guarantees better efficiency in maintaining the electronic member 10 within the retaining device 510.

[0036] Fig. 4 shows a section of a pneumatic tire 100, which is also a pneumatic casing, according to the invention comprising a crown S extended by two sidewalls F and ending in two beads B. In this case, the tire 100 is intended to be mounted on a wheel which is not shown in this figure, at the level of the two beads B. A closed cavity is thus delimited, containing at least one fluid under pressure, delimited both by the second radially inner surface 130 of the pneumatic tire 100 and by the outer surface of the wheel. The pneumatic tire 100 also comprises a first surface 140 radially outer of the pneumatic tire 100.

[0037] The reference axis 201 will be noted corresponding to the reference axis or natural axis of rotation of the tire 100 and the median plane 211, perpendicular to the reference axis 201 and equidistant from the two beads B. The intersection of the reference axis 201 by the median plane 211 determines the center of the tire 200. A Cartesian reference will be defined at the center of the tire 200 consisting of the reference axis 201, a vertical axis 203 perpendicular to the ground and a longitudinal axis 202 perpendicular to the other two axes. And, we will define the axial plane 212 passing through the reference axis 201 and the longitudinal axis 202, parallel to the ground plane and perpendicular to the median plane 211. Finally, we will call vertical plane 213, the plane perpendicular to both the median plane 211 and the axial plane 212 passing through the vertical axis 203.

[0038] Any material point of the tire 100 is uniquely defined by its cylindrical coordinates (Y, R, θ). The scalar Y represents the axial distance to the center of the tire 200 in the direction of Reference axis 201 defined by the orthogonal projection of the material point of the tire 100 onto Reference axis 201. A radial plane 214 will be defined making an angle θ with respect to the vertical plane 213 around Reference axis 201. The material point of the tire 100 is identified in this radial plane 214 by the distance R to the center of the tire 200 in the direction perpendicular to Reference axis 201 identified by the orthogonal projection of this material point onto Radial axis 204. The unit vector perpendicular to the radial plane 214 and forming a direct trihedron with the unit vectors of the axial 201 and radial 204 directions represents the circumferential direction of the tire 100. We note in Fig.4, the presence of an arrow 300 carried by longitudinal tax 202 indicating the direction of movement of the tire 100 when the latter is mounted on the vehicle and the vehicle is moving forward.

[0039] This tire 100 has on the radially inner surface 130 a retaining device 510 which is fixed to the surface 130 by gluing according to the usual techniques of the state of the art when the retaining device 510 is made of elastomer material. The retaining device 510 is fixed at the top S of the tire casing 100, which improves its endurance since the retaining device 510 thus positioned provides less worry during the operations of mounting or dismounting the wheel on the tire casing 100. Indeed, the retaining device 510 is located in an area remote from the beads B of the tire casing 100. Here, the retaining device 510 is equipped with an electronic member 10 at within its open volume which constitutes a housing adapted to receive the electronic component 10. As a result, the pneumatic casing 100 is here ready to be mounted on a wheel to constitute a mounted assembly. The electronic component 10 can deliver various functions such as the identification of certain components such as the electronic component itself, the tire. But the electronic component can also be equipped with a pressure and / or temperature sensor in order to evaluate the inflation pressure of the mounted assembly. Finally, it can also be equipped with a sensor directly measuring the curvature of the pneumatic casing such as an accelerometer or a flexometer making it possible to trace back to the usage quantities of the tire such as the angular speed, the mileage traveled, the static load applied.All of these quantities make it possible to identify the performance of the tire, such as its wear, its grip or intrinsic quantities of the ground on which the tire rolls.

[0040] In the specific case of Fig. 4, the electronic components of the electronic member 10 are encapsulated in a protective housing. This protective housing has a cliff which extends above the retaining device 510. Here, the cliff is tangent to the free edge of the retaining wall of the retaining device 510 over its entirety. The free edge delimits the opening of the retaining device 510 through which the electronic member 10 is inserted or extracted from the receiving volume of the retaining device 510. In this particular case, the barycenter of the points of the line of tangency between the cliff of the electronic member 10 and the free edge of the retaining device 510 is located on the axis of revolution of the electronic member 10, which corresponds to a particular case where the part of the cliff in tangency with the free edge is located behind the axis of revolution of the electronic member.

Claims

CLAIMS 1. Electronic system (1000) comprising an electronic member (10) and a retaining device (510) for the electronic member (10) capable of being fixed to a wall of a pneumatic casing, said retaining device (510) comprising: - a sole (511) capable of being fixed to the wall of the pneumatic casing via an external surface, - a closed retaining wall (512), capable of retaining said electronic member (10), extending from the sole (511) to a free edge (513) and defining with said sole (511) an open volume (520), - said volume (520), capable of accommodating at least a portion of said electronic member (10), being defined by an internal surface (514) of said sole (511) and by an internal surface (515) of said retaining wall (512), having an opening (516) delimited by the free edge (513) of said retaining wall (512), capable of deforming to introduce said electronic member (10) into said volume (520); said electronic member (10) comprising a protective housing (12) defining an external surface (30) circumscribed in a cylinder (17) whose axis of revolution (15) is perpendicular to the median plane of the external surface of the sole (511) of said retaining device (510) and delimited by two parallel planes (16,16'); and characterized in that the free edge (513) of the retaining wall (512) extends radially towards the axis of revolution (15) of the cylinder (17) circumscribed on the outer surface (30) of the protective housing (12) from a closed line (530) of the retaining wall (512) distal to the sole (511) along the axis of revolution (15) whose points have a tangent vector which has a principal component along the radial direction of the cylindrical reference frame associated with the cylinder (17), in that the radial extension of the retaining wall (512) to each point of the free edge (513) is carried out over a distance (r) between 25% and 35% of the radial distance (rsso) of the closed line (530) located in the same radial plane,in that the outer surface (30) of the protective housing (12) comprises a first cliff (50) located radially internal to the projection (517) of the free edge (513) of the retaining wall (512) on the outer surface (30) in the direction of revolution axis (15), in that a part of the first cliff (50) is tangent, over an angular sector, to the projection (517) of the free edge (513) on the surface, external (30) and in that the first cliff (50) having its main component in the direction of the axis of revolution (15) extends in the direction of the axis of revolution (15) over a distance (h) greater than twice the thickness (e) of the retaining wall (512) at the free edge (513) in said direction.

2. Electronic system (1000) according to claim 1 wherein the first cliff (50) is tangent to the projection (517) of the free edge (513) of the retaining wall (512) on the outer surface (30) along the axis of revolution (15) over at least one third of the entire curvilinear length of the projection (517) of the free edge (513) on the outer surface (30).

3. Electronic system (1000) according to claim 2 wherein the first cliff (50) is tangent to the projection (517) of the free edge (513) of the retaining wall (512) on the outer surface (30) along the axis of revolution (15) over at least half of the entire curvilinear length of the projection (517) of the free edge (513) on the outer surface (30).

4. Electronic system (1000) according to claim 3 wherein the first cliff (50) is tangent to the projection (517) of the free edge (513) of the retaining wall (512) on the outer surface (30) along the axis of revolution (15) over the entire curvilinear length of the projection (517) of the free edge (513) on the outer surface (30).

5. Electronic system (1000) according to any one of the preceding claims in which the electronic member (10) comprises the following elements: - a radio transmitter / receiver coupled to at least one radio antenna; - a microprocessor located on a printed circuit, coupled to the radio transmitter / receiver and powered by an energy source, said elements are encapsulated in the protective housing (12).

6. Arrangement of an electronic system (1000) according to one of claims 1 to 5 and of a pneumatic envelope (100) being able to rotate around an axis of rotation (201), said pneumatic envelope (100) comprising a top (S), two flanks (F) extending from the top (S) and ending in two beads (B) able to be connected to a wheel, in wherein the electronic system (1000) is fixed via the external surface of the sole (511) of the retaining device (510) on one of the surfaces (130, 140) of the pneumatic casing (100), preferably on the radially inner surface (130) of the pneumatic casing (100).

7. Arrangement according to claim 6 in which the electronic system (1000) is fixed on the radially inner surface (130) of the pneumatic casing (100) and at the top (S) of the pneumatic casing (100).

8. Arrangement according to claim 7 wherein the pneumatic casing (100) being able to rotate around the axis of rotation (201) in a main direction corresponding to a direction of movement (300) relative to a ground of a vehicle equipped with said arrangement in forward gear, the barycenter of the points of the first cliff (50) of the protective housing (12) of the electronic member (10) tangent to the projection of the free edge (513) of the retaining wall (512) on the outer surface (30) is positioned behind the axis of revolution (15) of the cylinder (17) circumscribed to the protective housing (12) of the electronic member (10) in the direction of movement (300) of the vehicle when the electronic system (1000) is located entirely in an angular sector of the pneumatic casing (100) in contact with the ground.

9. Arrangement according to claim 8 wherein the median plane (55) of the part of the first cliff (50) tangent to the projection of the free edge (513) of the retaining wall (512) on the outer surface (30), delimiting the angular sector of the part of the first cliff (50) into two equal angular sectors in the cylindrical reference frame associated with the cylinder (17) circumscribed to the protective housing (12) of the electronic member (10) has its normal having a main component along the axis of rotation (201) of the pneumatic casing (100), preferably its normal is collinear with the axis of rotation (201) of the pneumatic casing (100).

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