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 retaining wall (512) comprises a protruding element (550) radially on the outside of the free edge (513), extending over a thickness (e) along the axis of revolution (15), in that the housing (12) comprises a groove (51) defining a second volume (52) capable of accommodating the protruding element (550) of the retaining wall (512).

Description

DEVICE FOR ATTACHING 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 in order to convey identification information about 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 integration of electronic devices into pneumatic tires allows for the connection of these tires, leading to the development of new services to optimize tire usage. However, these electronic components sometimes contain thermomechanically fragile elements, necessitating their integration after the tire has been manufactured. Consequently, the introduction of a mounting device as an interface between the electronic device and the tire has emerged. These mounting devices are generally elastic to avoid excessive stress on the tire, to accommodate the significant deformations it undergoes during use, and to dampen the stresses transmitted to the electronic device.One of the most commonly used device designs is a patch with a base that serves as a mounting point for the pneumatic casing and a self-enclosed wall extending from the base to an opening. The wall serves to grip or hold the electronic component in position within the device, the electronic component being tightly mounted inside the elastically deformable wall. The opening allows the electronic component to be inserted into and removed from the patch thanks to the elasticity of the wall material.

[0003] Document W02018 / 150141A1 illustrates a patch of this type. Although this patch specifically features a clamping system to limit its opening, it is otherwise entirely consistent with a patch for attaching an electronic device to a pneumatic enclosure. This type of patch sometimes presents a problem with the mechanical stability of the system comprising the patch and the electronic component during the use of the pneumatic enclosure on which the patch is mounted. is fixed. Particularly under high-speed driving conditions, the forces generated at the patch and the electronic component due to the change in radius of curvature when the angular sector of the tire where the patch is fixed enters or exits the contact area are significant. This sometimes leads to such deformation of the mounting patch that the electronic component mounted inside the patch becomes at least partially removed from the patch's housing cavity, ultimately resulting in the electronic component being ejected from the patch. This ejection of the electronic component, generally destructive to the component itself, can also damage the structure of the tire by projecting the electronic component onto the tire walls, especially at high speeds.

[0004] The objects of the invention that follow aim to solve the problems of ejection of the electronic component from the fastening patch. The solutions must be economical, reliable, and without impacting the operation of the electronic component housed within the fastening patch. Description of the invention

[0005] The invention relates to an electronic system comprising an electronic component and a retention device for the electronic component adapted to be fixed to a wall of a pneumatic enclosure, said retention device comprising: • a sole suitable for 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 base to a free edge and defining an open volume with said base, • said volume, suitable for housing at least part of said electronic component, being defined by an internal surface of said base and by an internal surface of said retaining wall, having an opening delimited by the free edge of said retaining wall, suitable for deforming to introduce said electronic component into said volume, said electronic component comprising a protective housing defining an external surface circumscribed within a cylinder whose axis of revolution is perpendicular to the median plane of the external surface of the base of said retaining device and delimited by two parallel planes; and characterized in that the retaining wall comprises a projecting element located radially externally to the free edge with respect to the axis of revolution and extending towards the volume of the retaining device over a thickness along the direction of the axis of revolution of the cylinder circumscribed about the protective housing, in that the external surface of the protective housing comprises a continuous and closed groove located radially externally to the projection of the free edge of the retaining wall onto the external surface along the direction of the axis of revolution of the cylinder circumscribed about the protective housing and extending over an axial distance, in that the groove defines a second volume suitable for receiving the projecting element and in that the projecting element extends over a radial distance included in the radial extent of the groove with respect to the axis of revolution.

[0006] Such a retention device addresses the technical problem posed, since the radial extension of the retaining wall is equipped with a protruding element. This provides a degree of rigidity to the radial extension at the point of this protruding element, thereby ensuring energy control over the deformation of the patch opening, preventing easy ejection of the electronic component from the mounting device. The fact that this protruding element is not located at the free edge also contributes to retaining the electronic component, since before removing the protruding element from the groove, the radial extension of the retaining wall must be folded back between its free edge and the protruding element. Thus, the dimensions of the radial extension also determine the size of the opening defined by the free edge, which constrains the electronic component to remain within the open volume.The presence and dimensions of the continuous groove on the electronic component's protective housing create a blocking zone between the electronic component and the retaining device, thus forcing the electronic component to remain within the open volume of the retaining device. However, the electronic component can still be extracted using an external tool that first enlarges the opening in the retaining wall by applying a uniform, specific force along the entire free edge to reduce the radial extension of the retaining wall and remove it from the groove. During tire use, even at high speeds, such a force cannot be applied to the system due to the absence of the tool within the tire and the specific nature of the external force applied to the system at the moment of impact upon entering the contact area of ​​the tire's angular sector. electronic is fixed which cannot be uniform over the entire free edge of the retaining wall.

[0007] Preferably, the projecting element of the retaining wall of the restraining device is annular around the axis of revolution and extends angularly over the entire projection of the free edge onto the external surface.

[0008] To take advantage of the mechanical anchoring provided by the continuous groove, it is preferable for the protruding element to angularly cover the axis of revolution of the electronic component in order to ensure the electronic component is positioned within the retaining device. The angular coverage of the protruding element can be discontinuous, meaning that the protruding element consists of several disjointed pads located radially at the same distance from the axis of revolution.

[0009] Preferably, the section of the groove in the protective housing of the electronic component is the counterform of the section of the protruding element of the retaining device.

[0010] By ensuring synergy between the shape of the groove section and that of the section of the protruding element, the contact surface between the two elements is optimized, which increases the overall contact force applicable for the same level of deformation of the most elastic element, i.e. the protruding element.

[0011] Advantageously, the section of the projecting element is included in the group comprising a semicircle, a semiellipse, a quadrilateral.

[0012] These shapes offer the advantage of a non-linear contact force, allowing for a gradient of contact effort, which ensures better mechanical retention of the electronic component within the retaining device. Indeed, deformation of the retaining wall is less pronounced than with a geometric shape ensuring linear progression, such as a triangle. Furthermore, these convex shapes allow for the economical fabrication of the protruding element on the retaining device and the groove on the protective housing, as the shapes can be obtained through molding, for example.

[0013] In a specific embodiment, the electronic component includes the following elements: a radio transmitter / receiver coupled to at least one radio antenna; • a microprocessor located on a printed circuit board, coupled to the electric radio transmitter / receiver and powered by a power source, said elements are encapsulated in the protective housing.

[0014] The electronic device here includes a radio frequency transponder, meaning it contains radio frequency communication components for transmitting and receiving commands. In this case, the radio frequency transponder is active, meaning it has a power source primarily used to transmit the response via radio frequency communication. Indeed, radio frequency transmission is an energy-intensive function for large data streams, such as the transmission of measurement data, but the operations and calculations performed by a microprocessor can also be energy-intensive. For calculations, the microprocessor has varying levels of processing power to handle measurement data from, for example, a sensor connected to the microprocessor.It should be noted that the energy source, which can be for example a battery, can be bulky but also massive, which leads to significant centrifugal forces and considerable shock forces that can cause the electronic component to be ejected unexpectedly from the fastening device.

[0015] According to a particular embodiment, the distance of the groove is greater than half the thickness of the protruding element, preferably the distance is greater than the thickness of the protruding element.

[0016] Preferably, the groove extends along the direction of the axis of revolution of the cylinder circumscribed by the protective housing over a distance identical to the thickness of the protruding element along said direction.

[0017] Indeed, since the groove is initially in contact with the protruding element due to their geographical proximity, and is capable of accommodating the protruding element within the second volume, a strong interaction will occur between the two initially disjointed elements, thus improving the overall mechanical strength. Naturally, the larger the contact surface between the two elements, the greater the resulting force for the same level of applied deformation. Consequently, ejecting the electronic component from the retention device requires more deformation energy. If the axial distance of the groove is at When the groove is less than half the thickness of the protruding element, the mechanical anchoring generated by the interaction between the two components is sufficient to retain the electronic device within the retaining mechanism. When the groove is deeper than the thickness of the protruding element, there is no compression of the protruding element; the groove's axial volume is sufficient to accommodate the protruding element without stress, thus improving the mechanical strength of the protruding element. The ideal intermediate case is when the axial distance of the groove corresponds to the thickness of the protruding element. Indeed, the mechanical anchoring between the two components is maximized over the entire thickness of the protruding element while minimizing the pre-stress on the protruding element.

[0018] The mechanical locking between the protruding element and the groove is controlled by the groove depth. The greater the depth, the greater the mechanical anchoring force of the retaining wall within the groove of the electronic component. The mechanical resistance of this anchoring has a threshold determined by the thickness of the protruding element within the groove, along the axis of revolution of the cylinder circumscribed by the protective housing. Ensuring that the groove depth is at least half the thickness of the protruding element provides sufficient additional deformation energy to extract the electronic component, thus improving the mechanical strength of the electronic system.

[0019] According to a preferred embodiment, the projecting element of the retaining wall of the restraining device is continuous and closed.

[0020] Because the groove is continuous and annular, the contact area between the protruding element and the groove is increased by dimensioning the protruding element to the curvilinear length of the groove. This continuous shape of the protruding element improves the mechanical anchoring between the protruding element and the groove by increasing the contact area between the two and distributing the deformation energy over a larger area while ensuring continuity of stress. This guarantees better mechanical strength of the protruding element, which is advantageous for high-speed rolling and extends the lifespan of the electronic system before ejection of the electronic component from the retention device due to localized breakage of a portion of the protruding element, which could occur if the protruding element is discontinuous in pieces. Furthermore, the axisymmetry of the protruding element provides a independence of the positioning of the electronic system within an object such as a pneumatic envelope with regard to the risk of ejection of the electronic component.

[0021] The invention also relates to an arrangement of an electronic system and a pneumatic casing being able to rotate about an axis of rotation, said pneumatic casing comprising a top (S), two sides (F) extending from the top (S) and ending in two ridges (B) able to be linked to a wheel, in which the electronic system is fixed via the external surface of the sole of the retaining device on one of the surfaces of the pneumatic casing, preferably on the radially inner surface of the pneumatic casing.

[0022] Advantageously, the electronic system is fixed on the radially inner surface of the pneumatic casing and the axial position of the electronic system is included in the axial extent of the apex (S) of the pneumatic casing.

[0023] 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 component cannot be installed within the raw form of the tire casing. Indeed, the electronic component would be subjected to the thermomechanical stresses associated with the tire casing manufacturing process. It is usually preferable to install the electronic system after the tire has been manufactured. Therefore, this electronic system is positioned on one of the surfaces, which are by nature external, of the tire casing. Preferably, the electronic system is positioned on the radially inner surface of the tire casing relative to the natural axis of rotation of the tire casing.Thus, the electronic component is protected, under operating conditions on the tire, by the tire's rubberized structure, which improves its mechanical durability. Positioning it at the apex allows easy access to measurement characteristics via a sensor of the electronic component associated with the contact area, enabling the retrieval of tire usage characteristics such as applied static load and rolling speed.

[0024] Preferably, the pneumatic casing is capable of rotating around the axis of rotation in a principal direction corresponding to a direction of movement relative to the ground of a vehicle equipped with said arrangement in forward motion, the centroid of the points of the protruding element of the retaining wall of the restraint device in an axial plane is positioned behind the axis of revolution of the cylinder circumscribed around the protective housing of the electronic component in the direction of movement of the vehicle when the electronic system is located entirely within an angular sector of the pneumatic envelope in contact with the ground.

[0025] In the case of forward driving, which can occur at very high speeds, the positioning of the protruding element of the retaining wall relative to the axis of revolution of the cylinder enclosed within the protective housing ensures that contact between the protruding element and the groove occurs immediately upon entry into the contact area, regardless of the shape or positioning of the protruding element. Consequently, the reaction force exerted by this contact will counteract the ejection of the electronic component from the retaining device. Thus, the orientation of the electronic system within the tire casing, when positioned directly above the apex (S) of the tire casing, is a significant factor in preventing the electronic component from being ejected, particularly at very high speeds. High and very high-speed driving is performed while the vehicle is moving forward.

[0026] The expression "behind" here means that the two points are separated by a distance d along said direction and that this distance d can be zero.

[0027] Most preferably, the median plane of the protruding element, delimiting the angular sector of the protruding element into two equal angular sectors in the cylindrical frame associated with the cylinder circumscribed about the protective housing of the electronic component, has its normal having a principal component along the rotation axis of the pneumatic envelope, preferably its normal is collinear with the rotation axis of the tire.

[0028] In order to ensure that the technical solution envisaged for retaining the electronic component of the fastening device is effective in all types of vehicle usage conditions, particularly when the pneumatic casing is mounted on the vehicle's steering axle, it is preferable to angularly center the protruding element so that contact is made in a straight line as well as in right turns or left turns. Brief description of the drawings

[0029] The invention will be better understood upon reading the following description, given solely by way of non-limiting example and made with reference to the accompanying figures, in which the same reference numbers designate identical parts throughout and in which: • Fig. 1 presents a perspective view of an electronic component, suitable for being attached to a tire via a retaining device, representing the state of the art; • Fig. 2 presents a cross-sectional view of the radial plane of the electronic system according to the invention; • Fig. 3 shows a top view of the electronic system of the invention, i.e. from the side of the opening of the cavity of the retaining device; • Fig. 4 presents a perspective and cross-sectional view of a pneumatic envelope equipped with an electronic system according to the invention. Detailed description of implementation methods

[0030] Fig. 1 is a perspective view of an electronic component 10, suitable for being fixed by means of a retaining device to a pneumatic casing, of the prior art.

[0031] The electronic component 10, shown here in grey, is delimited by a protective housing 12 encapsulating all 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 external surfaces 14 and 14' of the protective housing 12.

[0032] This protective housing 12 is a combination of a cone and a parallelepiped. The conical shape facilitates its insertion into or removal from a retaining device. The cone has a parallelepiped on one of its axially external surfaces, which houses the radio antenna. The antenna is also encapsulated within the housing. protection 12. The protection housing 12 is a monolithic piece or a piece assembled from several parts, the parts then being welded together.

[0033] The parts or the monolithic piece are obtained, for example, using a molding process from a plastic material such as a thermoset. Low-temperature curing of the plastic results in the final fabrication of the outer surface 30 of the protective housing 12.

[0034] Fig. 2 is a cross-sectional view of the radial plane of an electronic system 1000 according to the invention.

[0035] The electronic system 1000 consists of an electronic component 10 and a retaining device 510 intended to be fixed to the wall of a pneumatic envelope.

[0036] The retaining device 510 comprises a base 511 adapted to be fixed to the wall of a pneumatic casing via an external surface and a closed retaining wall 512 whose function is to retain said electronic component 10. The retaining wall 512 extends from the base 511 to a free edge 513, thus defining, together with the base 511, a volume 520. Here, a projecting element 550 is positioned on the retaining wall 512 in the direction of the volume 520. This element 550 is in the form of a ring, which is continuous and closed, around the axis of revolution 15, having a semi-circular cross-section. The height of this projecting element 550 is denoted "e" along the direction of the axis 15. This volume 520 is open, thus allowing the insertion and extraction of the electronic component 10 within the volume 520. The volume 520 is defined by the inner surface 515 of the retaining wall 512 and the inner surface 514 of the base 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 component 10 within the volume 520.

[0037] As in Fig. 1, the electronic unit 10 comprises a protective housing 12 encapsulating all the electronic components. This protective housing 12 defines an external surface 30. This external surface 30 is circumscribed within a cylinder whose axis of revolution 15 is perpendicular to the median plane of the external surface of the base 511. The circumscribed cylinder is truncated by two parallel planes, the first of which is similar to the internal surface 514 of the base 511, and the second of which is located axially external to the opening 516 of the retaining device 510.

[0038] The retaining wall 512 extends axially from the base 511 to the free edge 513. The portion of the retaining wall 512 comprising the free edge 513 has a predominantly radial rather than axial extension in order to form a retaining lip for the electronic component 10. One end of the lip is the free edge 513. The other end 530 is a closed line whose points have a vector tangent to the retaining wall 512, having a predominant component in the radial direction with respect to the axis of revolution 15 from the base 511. The radial extension of the lip thus formed extends from the closed line 530 to the free edge 513, includes the protruding element 550, and contributes to retaining the electronic component 10 within the retaining device during high-speed travel when the system 1000 is fixed to the wall. of a pneumatic envelope.Indeed, the protruding element 550, whether continuous or discontinuous, extending angularly over the entire free edge 513 of the retaining wall, makes the deformation of the lip more energetic, which contributes to the retention of the electronic component 10 within the retaining device 510. However, the application of a directed and sustained force allows the lip to open for the extraction and insertion of the electronic component 10 from the retaining device 510. In particular, this force must be uniform over the entire free edge 513, which does not typically occur when the angular sector of the pneumatic casing carrying the electronic system enters or exits the contact area during rolling.

[0039] Indeed, the protective housing 12 here presents a cliff 50 extending externally to the volume 520 of the retention device 510. This cliff 50 has its main component which extends along the direction of the axis of revolution 15.

[0040] The external surface 30 of the protective housing 12 has a groove 51 located at the protruding element 550. This groove 51 defines an annular recess with a semi-circular cross-section around the axis of revolution 15, extending radially over a distance TR greater than the radial extension rs of the protruding element 550. Furthermore, the groove 51 extends axially over a distance denoted "e'" greater than half the thickness "e" of the protruding element 550. This defines a second volume 52 suitable for accommodating the protruding element 550.

[0041] The combination of the lip dimensions defined by the retaining wall 512 with its free edge 513 equipped with a projecting element 550 and the dimensions of the groove 51 opposite the projecting element 550 ensures that the component is not ejected unintentionally electronic 10 of the restraint device 510 in normal use at high speeds when the electronic system 1000 is installed on a tire of a motor vehicle.

[0042] 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 from the side of the opening of the volume of the retaining device 510 in the axial direction.

[0043] From the radial periphery of the electronic system 1000, we first visualize the outer axial edge of the sole 511, which is circular here. 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 retaining wall 512. This separation is characterized by a change in curvature, and the material points of this circle 529 have a vector tangent to the sole 511, the principal component of which becomes axial, being radial from the sole 511. Next, 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 terminates in a second circle 513, which represents the free edge of the retaining wall 512.Next, between circles 530 and 513, there is a first dotted circle 17 corresponding to the radially outer surface of the circle circumscribed about the outer surface of the protective housing 12 of the electronic component 10. Then, four dotted circles 551 to 554 are found moving towards the electronic component 10. Circles 551 and 554 radially delimit the continuous, closed groove 51. Circles 552 and 553 delimit the protruding element 550, which is located axially above the lip.

[0044] Through the opening defined by circle 513, a circle 53 is observed, delimiting the axial end of the cliff 50 of the protective housing 12 of the electronic component 10. Thus, this cliff 50 is predominantly axial. The projecting element 550, delimited by circles 552 and 553, is annular and continuous. Here, the angular extension of the projecting element is divided into two angular sectors of 180 degrees each by the median plane 55, whose normal is collinear with the vector V. For clarity, 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 pneumatic casing, it is preferable that the local vector U of the electronic system in Fig. 3 corresponds to the direction vector of the circumferential direction of the associated cylindrical frame of reference. to the tire around its natural axis of rotation. Thus, once mounted on the vehicle, the center of gravity of the points of the protruding element 550 of the retaining wall 512 in an axial plane is located at, and therefore behind, the axis of revolution of the electronic system 1000 when the tire is traveling on the road in the vehicle's "forward" mode. This ensures greater efficiency in retaining the electronic component 10 within the retention device 510.

[0045] Fig. 4 shows a cross-section of a pneumatic tire 100, which is also a pneumatic casing, according to the invention, comprising a vertex S extended by two flanks F and terminating in two ridges 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 ridges B. This defines a closed cavity, containing at least one pressurized fluid, delimited both by the second radially internal surface 130 of the pneumatic tire 100 and by the external surface of the wheel. The pneumatic tire 100 also includes a first radially external surface 140 of the pneumatic tire 100.

[0046] We will note the reference axis 201 corresponding to the reference axis or natural axis of rotation of the pneumatic tire 100 and the median plane 211, perpendicular to the reference axis 201 and equidistant from the two ridges B. The intersection of the reference axis 201 by the median plane 211 determines the center of the pneumatic tire 100. We will define a Cartesian coordinate system at the center of the pneumatic tire 100 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 the vertical plane 213 the plane perpendicular to both the median plane 211 and the axial plane 212 passing through the vertical axis 203.

[0047] Every material point of the pneumatic tire 100 is uniquely defined by its cylindrical coordinates (Y, R, 9). The scalar Y represents the axial distance to the center of the pneumatic tire 100 in the direction of the reference axis 201, defined by the orthogonal projection of the material point of the tire 100 onto the reference axis 201. A radial plane 214 will be defined, making an angle 9 with respect to the vertical plane 213 around the reference axis 201. The material point of the pneumatic tire 100 is located in this radial plane 214 by the distance R at the center of the pneumatic tire 100 in the direction perpendicular to the reference axis 201 identified by the orthogonal projection of this material point onto the radial axis 204. The unit vector perpendicular to the radial plane 214 and forming a right-handed trihedron with the unit vectors of the axial direction 201 and radial direction 204 represents the circumferential direction of the pneumatic tire 100. Note in Fig. 4 the presence of an arrow 300 carried by the longitudinal axis 202 indicating the direction of movement of the pneumatic tire 100 when it is mounted on a vehicle and the vehicle is moving forward.

[0048] This pneumatic tire 100 has a retaining device 510 on its radially inner surface 130. This device is attached to the surface 130 by bonding using conventional prior art techniques when the retaining device 510 is made of an elastomeric material. The retaining device 510 is fixed at the apex S of the tire 100, which improves its durability since the retaining device 510, thus positioned, causes fewer problems during wheel mounting or dismounting operations on the tire 100. Indeed, the retaining device 510 is located in an area away from the beads B of the tire 100. Here, the retaining device 510 is equipped with an electronic component 10 within its open volume, which provides a suitable housing for the electronic component 10. Therefore, the tire 100 is ready to be mounted on a wheel to form a complete assembly.The electronic unit 10 can perform various functions, such as identifying certain components like the electronic unit itself or the tire. However, the electronic unit can also be equipped with a pressure and / or temperature sensor to assess the inflation pressure of the assembled tire. Finally, it can also be equipped with a sensor that directly measures the curvature of the tire, such as an accelerometer or a flexometer, allowing for the determination of tire usage parameters such as angular velocity, mileage, and applied static load. All of these parameters make it possible to identify tire performance characteristics such as wear, grip, or intrinsic properties of the surface on which the tire is traveling.

[0049] In the specific case of Fig. 4, the electronic components of the electronic unit 10 are encapsulated in a protective housing. This protective housing has an annular groove that extends below the protruding element of the retaining device 510. Here, the protruding element is discontinuous, in the form of a single protruding stud representing a The angular sector of 120 degrees around the axis of revolution. The angular orientation of the electronic system 1000 is intended, firstly, to position the stud so that it enters the contact patch first, that is to say, the centroid of the points of the protruding element in a radial plane is located behind the axis of revolution of the electronic component 10. Secondly, the median plane of this stud is positioned according to the circumferential direction of the tire in order to optimize the occurrences of contact between the groove and the stud whether the vehicle turns right or left.

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 retaining wall (512) comprises a projecting element (550) located radially outside the free edge (513) relative to the axis of revolution (15) and extending towards the volume (520) of the retaining device (510) over a thickness (e) in the direction of the axis of revolution (15) of the cylinder (17) circumscribed to the protective housing (12), in that the outer surface (30) of the protective housing (12) comprises a continuous and closed groove (51) located radially outside the projection (517) of the free edge (513) of the retaining wall (512) on the outer surface (30) in the direction of the axis of revolution (15) of the cylinder (17) circumscribed to the protective housing (12) and extending over an axial distance (e'),in that the groove (51) defines a second volume (52) capable of receiving the projecting element (550) and in that the projecting element (550) extends over a radial distance (rs) included in the radial extent (TR) of the groove (51) relative to the axis of revolution, 2. Electronic system (1000) according to claim 1 wherein the projecting element (550) of the retaining wall (512) of the retaining device (510) is annular around the axis of revolution (15) and extends angularly over the entire projection (517) of the free edge (513) on the external surface (30).

3. Electronic system (1000) according to one of claims 1 to 2 wherein the section of the groove (51) of the protective housing (12) of the electronic member (10) is the counter-shape of the section of the projecting element (550) of the retaining device (510).

4. Electronic system (1000) according to one of claims 1 to 3 wherein the section of the projecting element (550) is included in the group comprising a semicircle, a semi-ellipse, a quadrilateral.

5. Electronic system (1000) according to one of claims 1 to 4 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. Electronic system (1000) according to any one of claims 1 to 5 wherein the distance (e') of the groove (51) is greater than half the thickness (e) of the projecting element (550), preferably the distance (e') is greater than the thickness (e) of the projecting element (550).

7. Electronic system (1000) according to claim 6 wherein the groove (51) extends in the direction of the axis of revolution (15) of the cylinder (17) circumscribed to the protective housing (12) over a distance (e') identical to the thickness (e) of the projecting element (550) in said direction.

8. Electronic system (1000) according to one of claims 2 to 7 wherein the projecting element (550) of the retaining wall (512) of the retaining device (510) is continuous and closed.

9. Arrangement of an electronic system (1000) according to one of claims 1 to 8 and of a pneumatic casing (100) being capable of rotating about an axis of rotation (201), said pneumatic casing (100) comprising a top (S), two flanks (F) extending from the top (S) and ending in two beads (B) capable of being connected to a wheel, 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 internal surface (130) of the pneumatic casing (100).

10. Arrangement according to claim 9 wherein the electronic system (1000) is fixed on the radially inner surface (130) of the pneumatic casing (100) and the axial position of the electronic system is included in the axial extent of the top (S) of the pneumatic casing (100).

11. Arrangement according to claim 10 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 motion, the barycenter of the points of the projecting element (550) of the retaining wall (512) of the retaining device (510 in an axial plane 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.

12. Arrangement according to claim 11 in which the median plane of the projecting element (550), delimiting the angular sector of the projecting element (550) 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 principal 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 (100).

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