Device for fixing electronic component to casing

Abstract

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

Description

Technical Field

[0001] The invention relates to a device for fixing an electronic component to a tire casing, the purpose of which is to transmit identification information about the tire casing or physical parameters of the tire casing, these parameters being measured by the electronic component during the useful life of the tire casing. Background Art

[0002] The development of electronic components in tires has made it possible to connect and be connected to the tire, which has facilitated the development of new services, such as optimizing the use of the tire. Currently, these electronic components sometimes have thermomechanically vulnerable parts, which requires the electronic components to be inserted after the tire is manufactured. Therefore, the practice of inserting fixing devices as an interface between the electronic components and the tire has emerged. These fixing devices are usually elastic so as not to cause excessive stress on the tire, can adapt to the significant deformation experienced by the tire during use, and suppress the stress transmitted to the electronic components. One of the most common designs of this device is a patch, which has a base for fixing to the tire and is provided with a wall that closes itself and extends from the base to an opening. This wall is used to support or hold the electronic component in place within the device, and the electronic component is tightly mounted within the elastically deformable wall. Due to the elasticity of the opening material, the opening allows the electronic component to be inserted into and removed from the patch.

[0003] Document WO2018 / 150141A1 describes a patch of this nature. Although the patch specifically has a clamping system to limit the opening, it conforms in all respects to a patch for fixing electronic objects to a tire. In addition, during the use of the tire to which the system is fixed, this type of patch sometimes presents problems with the mechanical strength of the system comprising the patch and the electronic component. In particular, under high driving speed conditions, due to the change in the radius of curvature at the moment when the sector of the tire in which the patch is fixed enters or leaves the ground contact surface, a large force is generated on the patch and the electronic component. This sometimes causes the fixed patch to deform to a certain extent, so that the electronic component installed in the patch at least partially detaches from the accommodating cavity in the patch, which ultimately causes the electronic component to pop out of the patch. This pop-up of the electronic component, which is usually destructive to the electronic component, may also damage the structure of the tire itself due to the electronic component being thrown toward the tire wall (especially at high speeds).

[0004] The object of the following subject matter of the present invention is to solve the problem of ejection of electronic components of a mounting patch in a manner that is both economical and reliable and that does not adversely affect the operation of the electronic components housed in the mounting patch. Summary of the Invention

[0005] The invention relates to an electronic system comprising an electronic component and a holding device for holding the electronic component and capable of being fixed to the wall of a tire casing, said holding device comprising:

[0006] a substrate, which can be fixed to the wall of the carcass via its outer surface,

[0007] a closed retaining wall capable of retaining the electronic component, extending from the base up to a free edge and delimiting an open volume with the base;

[0008] the volume, capable of accommodating at least a portion of the electronic component, being defined by an inner surface of the base and an inner surface of the retaining wall, and having an opening bounded by a free edge of the retaining wall, the opening being deformable for inserting the electronic component into the volume;

[0009] The electronic component comprises a protective housing defining an outer surface, the outer surface circumscribing an interior of a cylinder, the rotation axis of the cylinder being perpendicular to a median plane of the outer surface of the base of the retaining device, and the cylinder being delimited by two parallel planes; characterized in that the free edge of the retaining wall extends radially from a closed line of the retaining wall of the base distal to the rotation axis toward the rotation axis of the cylinder circumscribing the outer surface of the protective housing, the tangent vectors of the points of the closed line having a main component along the radial direction of a cylindrical reference system associated with the cylinder, the radial extension of the retaining wall up to each point of the free edge extending for a distance between 25% and 35% of the radial distance of the closed line in the same radial plane, the outer surface of the protective housing comprising a first cliff radially inwardly of a projection of the free edge of the retaining wall onto the outer surface in the direction of the rotation axis, a portion of the first cliff being tangential to the projection of the free edge onto the outer surface in an angular sector, and the first cliff having a main component along the direction of the rotation axis extending in the direction of the rotation axis for a distance greater than twice the thickness of the retaining wall at the free edge in said direction.

[0010] This fixture solves the aforementioned technical problems because the radial extension is controlled and allows for a certain degree of flexure, thus controlling the deformation of the patch opening to some extent. This means that the electronic component is less likely to be ejected from the fixture. Furthermore, the radial extension also controls the size of the opening bounded by the free edge, thereby forcing the electronic component to remain within the open volume. The presence and size of the cliffs on the electronic component's protective housing also limit the deformation of the retaining wall, thereby forcing the electronic component to remain within the fixture's open volume. However, the electronic component can still be removed using an external tool that pre-enlarges the retaining wall opening by applying a uniform, specific load across the free edge, thereby reducing the radial extension of the retaining wall. During tire use, even at high speeds, such forces cannot be applied to the system because the tool is not in the tire, and due to the nature of the external forces applied to the system at the moment of impact when the angular sector of the tire to which the electronic system is secured enters the contact patch, the external forces cannot be evenly distributed across the entire free edge of the retaining wall.

[0011] Advantageously, the first cliff is tangential to the projection of the free edge of the retaining wall onto the outer surface along the axis of rotation over at least one third of the entire curvilinear length of the projection of the free edge onto the outer surface.

[0012] Very advantageously, the first cliff is tangential to the projection of the free edge of the retaining wall onto the outer surface along the axis of rotation over at least half of the entire curvilinear length of the projection of the free edge onto the outer surface.

[0013] Preferably, the first cliff is tangent to the projection of the free edge of the retaining wall onto the outer surface along the rotation axis over the entire curved length of the projection of the free edge onto the outer surface.

[0014] Bringing the first cliff of the protective housing of the electronic component into contact with the free edge of the retaining wall over at least one-third of the curved length of the free edge limits the movement of the electronic component relative to the fixture, as contact can be established immediately or with delay based on the relative motion imposed by the two objects. For a continuous and closed free edge, one-third of the curved length represents an angular sector of at least 120 degrees. Even if the relative motion of the two objects does not directly result in contact between the first cliff and the free edge, such contact will occur over a wide range of relative motion between the two objects. When such contact occurs, a contact force is generated that resists such motion, thereby helping to retain the electronic component within the cavity of the fixture. When the angle of the contact area between the first cliff and the free edge of the retaining wall increases to the point of full contact, this increases the amplitude and degree of retention of the electronic component within the open volume of the fixture.

[0015] In a specific embodiment, the electronic component includes the following elements:

[0016] a radio transmitter / receiver coupled to at least one radio antenna;

[0017] • A microprocessor located on a printed circuit, coupled to a radio transmitter / receiver and powered by an energy source, said components being enclosed in a protective housing.

[0018] In this case, the electronic component includes a radio frequency transponder, that is, a radio frequency communication component capable of transmitting / receiving in order to pick up instructions and respond to them. Here, the radio frequency transponder is active, that is, it includes an energy source and is mainly used to transmit responses via radio frequency communication. This is because radio frequency transmission is an energy-consuming function for transmitting large-scale responses such as measurement or calculation data. For calculation functions, the microprocessor has quite complex computing power to process measurement data from measurement sensors (such as measurement sensors connected to the microprocessor). It should be noted that the energy source (which can be a battery, for example) may be not only bulky but also heavy. If the electronic component is accidentally ejected from the fixture, it will cause significant centrifugal and impact forces, which are not insignificant.

[0019] The invention also relates to an arrangement of an electronic system and a tyre capable of rotating about an axis of rotation, the tyre comprising a crown (S), two sidewalls (F) extending from the crown (S) and terminating in two rims (B) capable of being connected to a wheel, wherein the electronic system is fixed to one of the surfaces of the tyre, preferably to the radially inner surface of the tyre, via the outer surface of the base of the retaining device.

[0020] Advantageously, the electronic system is fixed to the radially inner surface of the carcass in conformity with the crown (S) of the carcass.

[0021] This arrangement is the ultimate goal of the electronic system that forms the first subject of the present invention. Because the electronic system includes electronic components, they cannot be installed on the tire during the green stage. This is because the electronic components cannot withstand the thermal and mechanical stresses associated with the tire manufacturing process. It is generally best to install the electronic system after the tire has been manufactured. Therefore, the electronic system is positioned on one of the surfaces of the tire, essentially the outer surface. Preferably, the electronic system is positioned on the radially inner surface of the tire relative to the tire's natural axis of rotation. Thus, when used on the tire, the electronic components are protected by the tire's rubber structure, thereby improving their mechanical durability. Positioning them in line with the tire crown facilitates access to the measurement characteristics measured by the electronic components' sensors associated with the contact patch, thereby providing feedback on tire usage characteristics such as applied static load, driving speed, etc.

[0022] Preferably, when the outer tire is capable of rotating about the axis of rotation in a main direction (which corresponds to the direction of travel of a vehicle equipped with the arrangement moving forward relative to the ground), when the electronic system is completely in the angular sector of the outer tire in contact with the ground, the center of mass of the point at which the first cliff of the protective housing of the electronic component is tangent to the projection of the free edge of the retaining wall on the outer surface is positioned behind the axis of rotation of the cylinder of the protective housing of the circumscribed electronic component in the direction of travel of the vehicle.

[0023] When the tire is used for forward travel, which can be at very high speeds, positioning the portion of the first cliff of the protective casing that is tangential to the free edge of the retaining wall relative to the axis of rotation of the cylindrical body circumscribing the protective casing ensures that contact between the free edge and the first cliff occurs immediately upon entering the contact patch. Consequently, the reaction force exerted by this contact prevents the electronic component from being ejected from the retaining device. This is particularly true in situations where the tangency between the two elements (the first cliff and the free edge) does not extend over the entire curved length of the free edge. Therefore, the orientation of the electronic system in the tire casing, when this system is positioned in alignment with the tire's crown (S), is a factor that influences the electronic component's ability to be prevented from being ejected, particularly at very high speeds. When the vehicle is in forward gear and traveling forward, the vehicle travels at high and ultra-high speeds.

[0024] The “rear” mentioned here means that the two points are separated by a distance d in the direction, and the distance d may be zero.

[0025] Very preferably, the median plane of the portion of the first cliff tangent to the projection of the free edge of the retaining wall on the external surface divides the angular sector of this portion of the first cliff into two equal angular sectors in a cylindrical reference system associated with the cylinder of the protective shell of the circumscribed element, and the normal of said median plane has a main component along the axis of rotation of the tire, preferably this normal is collinear with the axis of rotation of the tire.

[0026] In order to ensure that the envisaged technical solution for retaining the electronic component in the retaining device is effective under all types of use conditions on the vehicle, in particular when the tire is mounted on a wheel of the steering axle of the vehicle, the portion of the first cliff that is tangential to the free edge is preferably angularly centered so that good contact is achieved both when driving in a straight line and when turning to the right or to the left. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The invention will be better understood on reading the following description, given purely by way of non-limiting example and with reference to the accompanying drawings, in which like references indicate like parts, and in which:

[0028] · Figure 1 A perspective view of an electronic component capable of being fixed to a tire via a retaining device in the prior art is depicted;

[0029] · Figure 2 depicts a cross-sectional view on a radial plane of an electronic system according to one embodiment of the present invention;

[0030] · Figure 3 depicts a view of the electronic system according to the same embodiment of the invention, viewed from above, i.e. from the same side as the opening of the cavity of the holding device;

[0031] · Figure 4 Depicted is a perspective cross-sectional view of a tire casing equipped with an electronic system according to the invention. DETAILED DESCRIPTION

[0032] Figure 1 It is a perspective view of an electronic component 10 according to the prior art that can be fixed to a tire using a retaining device.

[0033] The electronic component 10, depicted here in grey, is delimited by a protective housing 12 which encloses 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 rotation 15 perpendicular to the printed circuit of the electronic component 10. This cylinder 17 with the axis of rotation 15 is interrupted by two parallel planes 16 and 16', which lie respectively on the axial outer surfaces 14 and 14' of the protective housing 12.

[0034] The protective housing 12 is a combination of a cone and a parallelepiped. The conical shape facilitates insertion into and removal from the retaining device. The cone has a parallelepiped on one of its axially outer surfaces, which houses the radio antenna. The radio antenna is enclosed in the protective housing 12. The protective housing 12 is either a monolithic component or a component assembled from multiple components that are subsequently welded together.

[0035] The component or integral part is obtained, for example, from a plastic material, such as a thermosetting plastic, using a molding method. Low-temperature solidification of the plastic completes the production of the outer surface 30 of the protective housing 12 .

[0036] Figure 2 FIG. 1 is a cross-sectional view on a radial plane of an electronic system 1000 according to one embodiment of the present invention.

[0037] The electronic system 1000 is composed of an electronic component 10 and a retaining device 510 intended to be fixed to the wall of a tyre.

[0038] The holding device 510 comprises a base 511 that can be fixed to the wall of the tire via its outer surface, and a closed holding wall 512, the purpose of which is to hold the electronic component 10. The holding wall 512 extends from the base 511 to a free edge 513 and thus defines, together with the base 511, a volume 520. This volume 520 is open, thereby allowing the electronic component 10 to be inserted into and removed from the volume 520. The volume 520 is delimited by an inner surface 515 of the holding wall 512 and an inner surface 514 of the base 511. An opening 516 of the volume 520 is delimited by the free edge 513 of the holding wall 512. This opening 516 is deformable to allow the electronic component 10 to be inserted into and removed from the volume 520.

[0039] as Figure 1 The electronic assembly 10 includes a protective housing 12 that encloses all electronic components. The protective housing 12 defines an outer surface 30. This outer surface 30 circumscribes the interior of a cylinder, with the cylinder's axis of rotation 15 perpendicular to the median plane of the outer surface of the base 511. The circumscribed cylinder is intersected by two parallel planes: the first plane pertains to the inner surface 514 of the base 511, while the second plane lies axially outward of the opening 516 of the retaining device 510.

[0040] The retaining wall 512 extends axially from the base 511 to a free edge 513. The portion of the retaining wall 512 including the free edge 513 has a predominantly radial, rather than axial, extension, thereby forming a retaining lip for retaining the electronic component 10. One of the ends of the lip is the free edge 513. The other end 530 is a closing line, the point of which has a vector tangent to the closing line and having a main component in a radial direction relative to the axis of rotation 15. The radial extension of the lip thus formed extends from the closing line 530 to the free edge 513, the distance r of the extension being the radial distance r from the closing line 530 to the axis of rotation 15. 530 When the system 1000 is fixed to the wall of the tire, the radial length of the lip contributes to retaining the electronic component 10 in the retaining device even at high speeds. However, this radial length is linked to another characteristic of the electronic system to fully ensure this retaining function.

[0041] Specifically, the protective housing 12 in this embodiment has a cliff 50 extending outside the volume 520 of the retaining device 510. This cliff 50 has a primary component extending in the direction of the rotational axis 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 axial extension of the cliff 50 ensures that the electronic component 10 is positioned relative to the opening 516 of the retaining device, thereby ensuring that the electronic component 10 is better retained within the retaining device 510. Furthermore, the cliff 50 needs to be positioned partially adjacent to the free edge 513 of the lip defined by the retaining wall 512. Therefore, it is necessary to ensure that the projection 517 of the free edge 513 onto the outer surface 30 of the protective housing in the axial direction 15 is tangential to the cliff 50 of the electronic component. Consequently, the positioning of the electronic component 10 within the retaining device 510 is more restricted, at least with respect to movement in a direction perpendicular to the tangent in the axial plane. Finally, to increase the number of possible restricted movement directions, the tangency between the cliff 50 and the projection 517 of the free edge 513 on the outer surface 30 should occur over an angular sector about the axis of rotation 15. Here, a tangency of more than 180 degrees is ensured, thereby limiting the relative movement of the electronic component 10 within the retaining device 510 to more than half of the possible movement. For applications with steered axles, a sector of 120 degrees is ideal to avoid cornering and potentially optimize the positioning of the electronic system 1000 within the tire.

[0042] The presence of the cliff 50 on the outer surface 30 of the electronic component 10 combined with the size of the lip defined by the retaining wall ensures that when the electronic system 1000 is mounted on a tire of a motor vehicle, the electronic component 10 cannot be accidentally ejected from the retaining device 510 during normal use at high speeds.

[0043] Figure 3 for Figure 2 This is a view of the electronic system 1000 from above. This means that, from the outside of the electronic system 1000 , the electronic system 1000 can be observed in the axial direction from the same side as the volume opening of the holding device 510 .

[0044] Starting from the radial periphery of the electronic system 1000, the first thing that can be seen is the axial outer edge of the base 511, which in this case is circular, although the outer edge of the base 511 can also be elliptical or quadrilateral. Next, a first circle 529 can be seen, which corresponds to the boundary between the base 511 and the retaining wall 512 and is characterized by a change in curvature, with particles on this circle 529 having tangents whose main component is axial. Next, a circle 530 can be seen, which corresponds to the closed line of the retaining wall 512 and represents one end of the annular lip of the retaining wall 512. This lip ends in a second circle 513, which represents the free edge of the retaining wall 512. Next, between the circle 530 and the circle 513, there is a first circle 17 with a dashed line, which corresponds to the radial outer surface of the circle of the outer surface of the protective housing 12 of the circumscribed electronic component 10.

[0045] Through the opening defined by the circle 513, two semicircles 51 and 52 can be seen here, which correspond to the axial ends of the cliff 50 of the protective housing 12 of the electronic component 10. Therefore, this cliff 50 is mainly axial, but not only axial. The circle 51 is tangential to the circle 513 over its entire semicircle, thus sweeping out an angular sector of 180 degrees around the axis of rotation of the circumscribed cylinder 17 on the outer surface of the protective housing 12. Here, the angular sector is divided into two angular sectors of 90 degrees by the median plane 55, the normal of which is colinear with the vector V. For ease of understanding, this view from above is confined to an axial plane (U, V), the normal of which corresponds to the axis of rotation of the circumscribed cylinder 17. Once the electronic system 1000 has been fixed to the wall of the casing, Figure 3 The local vector U of the electronic system should preferably correspond to a directional vector in the circumferential direction of a cylindrical reference frame associated with the tire about its natural axis of rotation. Thus, once mounted on a vehicle, when the tire is traveling along a road with the vehicle in forward gear, the portion of the cliff 50 that is tangential to the free edge 513 of the retaining wall is located behind the axis of rotation 15 of the electronic system 1000. This ensures more effective retention of the electronic component 10 within the retaining device 510.

[0046] Figure 4 A cross section of a pneumatic tire 100 according to the invention is shown, which is also a tire casing and comprises a crown S extending from two sidewalls F and terminating in two beads B. In this case, the tire 100 is intended to be mounted on a wheel (not shown in this figure), at the two beads B. This defines a closed cavity containing at least one pressurized fluid, which is delimited both by a 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 radially outer surface 140 of the pneumatic tire 100.

[0047] The axis corresponding to the reference axis or natural rotational axis of the pneumatic tire 100 and the median plane 211 will be denoted as reference axis 201. Median plane 211 is perpendicular to reference axis 201 and equidistant from both beads B. The intersection of reference axis 201 and median plane 211 defines the center of the pneumatic tire 200. A Cartesian reference system is defined at the center of the pneumatic tire 200, consisting of reference axis 201, a vertical axis 203 perpendicular to the ground, and a longitudinal axis 202 perpendicular to the other two axes. Furthermore, a plane passing through reference axis 201 and longitudinal axis 202, parallel to the ground, and perpendicular to median plane 211 will be defined as axial plane 212. Finally, a plane perpendicular to median plane 211 and axial plane 212, and passing through vertical axis 203, will be referred to as vertical plane 213.

[0048] Any mass point of the pneumatic tire 100 is uniquely defined by its cylindrical coordinates (Y, R, θ). The scalar Y represents the axial distance from the center of the pneumatic tire 200 in the direction of the reference axis 201, which is defined by the orthogonal projection of the mass point of the tire 100 on the reference axis 201. The plane that makes an angle θ with respect to the vertical plane 213 around the reference axis 201 will be defined as a radial plane 214. In this radial plane 214, the mass point of the pneumatic tire 100 is referenced by a distance R from the center of the pneumatic tire 200 in a direction perpendicular to the reference axis 201, determined by the orthogonal projection of the mass point on the radial axis 204. The unit vector perpendicular to the radial plane 214 represents the circumferential direction of the casing 100, and this unit vector forms a right-handed coordinate system (trièdre direct) with the unit vectors of the axial direction 201 and the radial direction 204. It should be noted that Figure 4 Included is an arrow 300 assigned to the longitudinal axis 202 , which indicates the direction of travel of the pneumatic tire 100 when the pneumatic tire 100 is mounted on a vehicle and the vehicle is traveling forward.

[0049] The tire 100 has a retaining device 510 on its radially inner surface 130. When the retaining device 510 is made of an elastomeric material, the retaining device 510 is secured to the surface 130 by adhesive bonding according to conventional techniques. The retaining device 510 is secured to the crown S of the tire 100, which improves its durability because, with this positioning, the retaining device 510 attracts less attention during installation and removal of the tire 100 from the wheel. Specifically, the retaining device 510 is located in an area distal to the tire bead B of the tire 100. In this embodiment, the retaining device 510 houses the electronic component 10 within its open volume, which constitutes a housing designed to accommodate the electronic component 10. Thus, the tire 100 is ready for installation on a wheel, thereby forming a wheel-tire assembly. The electronic component 10 can provide various functions, such as identifying certain components, such as the electronic component itself or the tire. However, the electronic component can also be equipped with pressure and / or temperature sensors to assess the inflation pressure of the wheel-tire assembly. Finally, it can also be equipped with sensors that directly measure the curvature of the tire, such as accelerometers or deflectometers, making it possible to derive common tire variables such as angular velocity, distance traveled, and applied static load. All these variables allow the identification of the tire's performance qualities, such as its wear, grip, or intrinsic variables of the surface on which it is running.

[0050] exist Figure 4 In the specific case of , the electronic components of the electronic component 10 are enclosed in a protective housing. The protective housing has a cliff that extends beyond the retaining device 510. Here, the cliff is tangential to the free edge of the retaining wall of the retaining device 510 as a whole. The free edge defines an opening in the retaining device 510, through which the electronic component 10 is inserted into or removed from the storage volume of the retaining device 510. In this specific case, the centroid of the points of tangency between the cliff of the electronic component 10 and the free edge of the retaining device 510 lies on the rotation axis of the electronic component 10, which corresponds to the specific case where the portion of the cliff tangent to the free edge is located behind the rotation axis of the electronic component.

Claims

1. An electronic system (1000) comprising an electronic component (10) and a holding device (510) for holding the electronic component (10) and capable of being fixed to a wall of a tire casing, the holding device (510) comprising: - a base (511) capable of being fixed to the wall of the carcass via its outer surface, a closed retaining wall (512) capable of retaining the electronic component (10), extending from the base (511) up to a free edge (513) and delimiting an open volume (520) with the base (511), - the volume (520) capable of accommodating at least a portion of the electronic component (10), being defined by the inner surface (514) of the base (511) and the inner surface (515) of the retaining wall (512), and the volume (520) having an opening (516) delimited by the free edge (513) of the retaining wall (512), the opening being deformable for inserting the electronic component (10) into the volume (520); The electronic component (10) comprises a protective housing (12) defining an outer surface (30), the outer surface being circumscribed within a cylindrical body (17), the rotation axis (15) of the cylindrical body being perpendicular to the median plane of the outer surface of the base (511) of the holding device (510), and the cylindrical body being delimited by two parallel planes (16, 16'); Characterized in that the free edge (513) of the retaining wall (512) extends radially from a closed line (530) of the distal retaining wall (512) of the base (511) about the rotation axis (15) toward the rotation axis (15) of the cylinder (17) circumscribing the outer surface (30) of the protective shell (12), the tangential vectors of the points of the closed line (530) have a main component along the radial direction of the cylindrical reference system associated with the cylinder (17), and the radial extension distance (r) of each point of the retaining wall (512) up to the free edge (513) is the radial distance (r) of the closed line (530) in the same radial plane. 530 ), the outer surface (30) of the protective shell (12) includes a first cliff (50) located radially inside a projection (517) of a free edge (513) of the retaining wall (512) on the outer surface (30) in the direction of the rotation axis (15), a portion of the first cliff (50) is tangential to the projection (517) of the free edge (513) on the outer surface (30) in an angular sector, and the first cliff (50) having a main component in the direction of the rotation axis (15) extends in the direction of the rotation axis (15) for a distance (h) greater than twice the thickness (e) of the retaining wall (512) at the free edge (513) in said direction.

2. The electronic system (1000) according to claim 1, wherein The first cliff (50) is tangent to a projection (517) of the free edge (513) of the retaining wall (512) onto the outer surface (30) along the axis of rotation (15) over at least one third of the entire curved length of the projection (517) of the free edge (513) onto the outer surface (30).

3. The electronic system (1000) according to claim 2, wherein: The first cliff (50) is tangent to a projection (517) of the free edge (513) of the retaining wall (512) onto the outer surface (30) along the axis of rotation (15) over at least half of the entire curved length of the projection (517) of the free edge (513) onto the outer surface (30).

4. The 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 rotation axis (15) over the entire curved length of the projection (517) of the free edge (513) on the outer surface (30).

5. The electronic system (1000) according to any one of the preceding claims, wherein The electronic component (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 a radio transmitter / receiver and powered by an energy source, The components are enclosed in a protective housing (12).

6. Arrangement of an electronic system (1000) according to any one of claims 1 to 5 and a tyre (100) rotatable around an axis of rotation (201), the tyre (100) comprising a crown (S), two sidewalls (F) extending from the crown (S) and terminating in two beads (B) connectable to a wheel, wherein The electronic system (1000) is fixed to one of the surfaces (130, 140) of the tire (100), preferably to the radially inner surface (130) of the tire (100), via the outer surface of the base (511) of the holding device (510).

7. The arrangement according to claim 6, wherein The electronic system (1000) is fixed to the radially inner surface (130) of the tire casing (100) in conformity with the crown (S) of the tire casing (100).

8. The arrangement of claim 7, wherein: In the case where the tire (100) is able to rotate about the axis of rotation (201) in a main direction corresponding to the direction of travel (300) of the vehicle equipped with the arrangement moving forward relative to the ground, when the electronic system (1000) is completely in the angular sector in which the tire (100) is in contact with the ground, the center of mass of the point of contact of the first cliff (50) of the protective housing (12) of the electronic component (10) with the free edge (513) of the retaining wall (512) on the outer surface (30) is positioned behind the axis of rotation (15) of the cylindrical body (17) of the protective housing (12) of the circumscribed electronic component (10) in the direction of travel (300) of the vehicle.

9. The arrangement according to claim 8, wherein The median plane (55) of the portion of the first cliff (50) that is tangent to the projection of the free edge (513) of the retaining wall (512) on the outer surface (30) divides the angular sector of the portion of the first cliff (50) into two equal angular sectors in a cylindrical reference system associated with the cylinder (17) of the protective housing (12) of the external electronic component (10), and the normal of the median plane has a main component along the axis of rotation (201) of the tire (100), preferably the normal is collinear with the axis of rotation (201) of the tire (100).

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