Device for fixing electronic components to tire casing

Abstract

The present invention provides an electronic system (1000) including a member (10) and a holding device (510), said device (510) comprising: - Base (511) and - a retaining wall (512) extending from a base (511) to an edge (513) and defining an open volume (520) for receiving the member (10); Equipped with - said volume (520) has an opening (516) defined by an edge (513); The member (10) includes a housing (12) circumscribing the inside of a cylinder (17) having an axis of rotation (15); The radial extension of the wall (512) from the closed line (530) to the edge (513) is the radial distance (r 530 ), and the housing (12) includes a cliff (50), the cliff (50) extending a distance along the axis of rotation (15) that is greater than the thickness of the wall (512).

Description

[Technical Field]

[0001] The present invention relates to an apparatus for securing electronic components to a tire casing to communicate identification information about the tire casing or physical parameters of the tire casing measured by the electronic components during the life of the tire casing. [Background technology]

[0002] The development of electronic objects in tire casings has made tire casings connectable and pre-connected, stimulating the development of new services, for example, to optimize the use of tire casings. However, these electronic components may have thermomechanically fragile components, which means that the electronic components must be inserted after the tire casing is manufactured. Therefore, fastening devices have been inserted as an interface between the electronic components and the tire. These fastening devices are generally elastic so as not to impose large stresses on the tire casing, and are designed to accommodate the large deformations that the tire casing undergoes during use and attenuate the stresses transmitted to the electronic components. One of the most common designs of such devices is a patch having a base used for fastening to the tire casing and a self-closing wall extending from the base to an opening. The wall serves to hold the electronic component in place within the device, and the electronic component is firmly attached within the elastically deformable wall. The opening allows the insertion and removal of the electronic component from the patch due to the elasticity of the material.

[0003] WO 2018 / 150141 A1 discloses a patch of this nature. Specifically, the patch has a clamping system to limit openings, but in all respects resembles a patch for fixing electronic objects to a tire casing. Furthermore, with this type of patch, the mechanical strength of the system, including the patch and electronic components, can be compromised during the use of the tire casing to which the system is fixed. Particularly under high-speed driving conditions, the radius of curvature changes as the sector of the tire casing to which the patch is fixed enters and leaves the contact patch, resulting in increased forces acting on the patch and the electronic components. This can cause the fixing patch to deform to the extent that electronic components mounted inside the patch are at least partially released from their containing cavities, ultimately resulting in the electronic components being ejected from the patch. This ejection of electronic components is generally harmful to the electronic components, but it can also damage the tire casing structure itself, especially at high speeds, as the electronic components are thrown against the tire wall. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2018 / 150141 Summary of the Invention [Problem to be solved by the invention]

[0005] The object of the subject invention below is to solve the problem of ejection of electronic components from a fixation patch in a manner that is both economical and reliable and that does not adversely affect the operation of the electronic components contained within the fixation patch. [Means for solving the problem]

[0006] The present invention relates to an electronic system including an electronic component and a holding device for holding the electronic component, the holding device being capable of being fixed to a wall of a tire casing, the holding device comprising: a base that can be fixed to the wall of the tire casing via its outer surface; a closed retaining wall capable of retaining the electronic component, extending from a base to a free edge and defining an open volume together with the base; Equipped with the volume capable of accommodating at least a portion of the electronic component is defined by an inner surface of the base and an inner surface of the retaining wall, and has an opening defined by a free edge of the retaining wall that is deformable for insertion of the electronic component into the volume; The electronic component includes a protective housing having an axis of rotation perpendicular to a median plane of an outer surface of a base of the retaining device and defining an outer surface circumscribing the inside of a cylinder defined by two parallel planes, a free edge of the retaining wall extending radially from a closed line of the distal retaining wall of the base centered on the axis of rotation toward the axis of rotation of the cylinder surrounding the outer surface of the protective housing, a point of the closed line having a tangent vector with a principal component along a radial direction of a cylindrical reference frame associated with the cylinder, a radial extension of the retaining wall to each point of the free edge extending over a distance of 25% to 35% of the radial distance of the closed line in the same radial plane, the outer surface of the protective housing including a first cliff radially inward of a projection of the free edge of the retaining wall onto the outer surface along the direction of the axis of rotation, a portion of the first cliff being in an angular sector a first cliff wall tangent to the projection of the free edge of the retaining wall onto the outer surface over a sector and having a major component along the direction of the rotation axis, the first cliff wall extending along said direction over a distance greater than twice the thickness of the retaining wall at the free edge along the direction of the rotation axis.

[0007] Such a fixing device addresses the aforementioned technical challenges because the controlled dimensions of the radial extensions result in a certain degree of bending, thereby managing the deformation of the patch opening so that the electronic component cannot be easily ejected from the fixing device. The size of the radial extensions also controls the size of the opening defined by the free edge, thereby forcing the electronic component to remain within the open volume. The presence and size of cliffs on the protective housing of the electronic component also limit the deformation of the retaining wall, thereby forcing the electronic component to remain within the open volume of the fixing device. On the other hand, the electronic component can also be removed in advance using an external tool that enlarges the opening of the retaining wall by applying a specific load uniformly across the entire free edge to reduce the radial extension of the retaining wall. This tool is not present within the tire, and since the specific nature of the external forces acting on the system during impact when the angular sector of the tire to which the electronic system is fixed enters the tread cannot be uniform across the entire free edge of the retaining wall, such forces are not applied to the system during tire use and at high speeds.

[0008] Advantageously, the first cliff wall is tangent 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 total curved length of the projection of the free edge onto the outer surface.

[0009] Very advantageously, the first cliff wall is tangent to the projection of the free edge of the retaining wall onto the outer surface along the axis of rotation over half the entire curvilinear length of the projection of the free edge onto the outer surface.

[0010] The first cliff wall is preferably tangent to the projection of the free edge of the retaining wall onto the outer surface along the axis of rotation over the entire curvilinear length of the projection of the free edge onto the outer surface.

[0011] Contact between the first cliff wall of the protective housing of the electronic component and the free edge of the retaining wall over at least one-third of the curved length of the free edge limits movement of the electronic component relative to the fixture, as contact is established immediately or with a delay depending on the relative movement imposed on the two objects. For a continuous, closed free edge, one-third of the curved length represents an angular sector of at least 120 degrees. Even if the relative movement of the two objects does not result in direct contact between the first cliff wall and the free edge, this contact occurs over a large sample of the relative movement of the two objects. When this contact occurs, a contact force is generated that opposes this movement and contributes to securing the electronic component within the cavity of the fixture. As the contact area between the first cliff wall and the free edge of the retaining wall increases angularly to the point of complete contact, the magnitude and degree of retention of the electronic component within the open volume of the fixture increases.

[0012] In one specific embodiment, the electronic component comprises: a wireless transmitter / receiver coupled to at least one wireless antenna; and The device includes the following elements: a microprocessor located on a printed circuit, coupled to a radio transmitter / receiver, and powered by an energy source, said elements being enclosed in a protective housing.

[0013] The electronic component in this case includes a radio frequency transponder, i.e., a radio frequency communication component that can pick up commands and send / receive responses to these commands. Here, the radio frequency transponder is active, i.e., it includes an energy source that is mainly used to emit responses via radio frequency communication. This is because radio frequency communication is an energy-consuming function for large-content responses, such as the transmission of measurement data or calculation data. Regarding the calculation function, the microprocessor has a fairly high level of calculation power for processing measurement data, for example, from measurement sensors connected to the microprocessor. It should be noted that the energy source, which can be, for example, a battery, is not only bulky but also heavy, and may result in considerable centrifugal forces and not inconsiderable impact forces if the electronic component is accidentally ejected from the fixed device.

[0014] The invention also relates to an arrangement of an electronic system and a tire casing that can rotate about an axis of rotation, said tire casing comprising a crown (S) and two sidewall portions (F) that extend from the crown (S) and terminate in two bead portions (B) that can be connected to a wheel, and wherein the electronic system is fixed to one of the surfaces of the tire casing, preferably to the radially inner surface of the tire casing, by the outer surface of the base of a retention device.

[0015] Advantageously, the electronic system is secured to the radially inner surface of the tire casing along the crown (S) of the tire casing.

[0016] This arrangement is the final destination of the electronic system that forms the first subject of the present invention. Because the electronic system includes electronic components, they cannot be attached to the tire casing at the green tire stage because they would not be able to withstand the thermal and mechanical stresses associated with the tire casing's manufacturing process. It is usually preferable to attach the electronic system after the tire is manufactured. Consequently, the electronic system is located on one of the tire casing's surfaces, which would normally be the outer surface. The electronic system is preferably located on the tire casing's radially inner surface, along the tire casing's natural axis of rotation. Therefore, under operating conditions on the tire casing, the electronic components are protected by the tire casing's rubber structure, thereby improving their mechanical durability. The arrangement of the electronic components along the crown allows for easy access to the measurement characteristics measured by the electronic components' sensors associated with the tread, thereby providing feedback on tire operating characteristics such as the static load experienced, running speed, etc.

[0017] In a state in which the tire casing can rotate about its axis of rotation in a main direction corresponding to the direction of movement of a forward-moving vehicle equipped with said arrangement relative to the ground, it is preferred that, when the electronic system is entirely within the angular sector of the tire casing in contact with the ground, the center of mass of the point of the first cliff wall of the protective housing for the electronic components, which is tangent to the projection of the free edge of the retaining wall onto the outer surface, is located behind the axis of rotation of the cylinder surrounding the protective housing for the electronic components in the direction of movement of the vehicle.

[0018] When the tire is used for forward travel and the travel speed is very high, the portion of the first cliff of the protective housing that is tangent to the free edge of the retaining wall is positioned relative to the rotation axis of the cylinder surrounding the protective housing, so that contact between the free edge and the first cliff occurs immediately upon entry into the ground. As a result, the reaction force caused by this contact opposes ejection of the electronic components from the retaining device. This is particularly true when the contact between the two elements, the first cliff and the free edge, does not cover the entire curved length of the free edge. Therefore, the orientation of the electronic system within the tire casing, when it is arranged along the crown (S) of the tire casing, is a factor that affects the non-ejection of the electronic components, especially at very high speeds. High and very high speed vehicle travel occurs when the vehicle is moving forward in forward gear.

[0019] The expression "behind" here means that the two points are spaced apart in said direction by a distance d, which may be zero.

[0020] It is highly preferred that the median plane of the portion of the first cliff wall tangent to the projection of the free edge of the retaining wall onto the outer surface, which defines an angular sector of the portion of the first cliff wall into two equal angular sectors in a cylindrical reference frame related to the cylinder surrounding the protective housing of the member, has a normal having a principal component along the axis of rotation of the tire casing, and the normal is preferably collinear with the axis of rotation of the tire casing.

[0021] In order to ensure that the technical solution envisaged for holding the electronic components in the fixing device is effective in all types of use conditions on the vehicle, in particular when the tire casing is mounted on a wheel of a steered axle of the vehicle, the part of the first cliff tangent to the free edge is preferably angularly centered so that contact is equally good when driving straight as when cornering to the right or left.

[0022] The invention will be better understood on reading the following description, given by way of non-limiting example only, with reference to the accompanying drawings in which like reference numerals indicate the same parts throughout. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a perspective view of an electronic component that can be fixed to a tire via a retaining device according to the prior art; [Figure 2] 1 is a cross-sectional view in a radial plane of an electronic system according to a first embodiment of the present invention; [Figure 3] 10 is a view of the electronic system from above, i.e., from the same side as the opening of the cavity of the holding device, according to the same embodiment of the present invention. [Figure 4] 1 is a perspective cross-sectional view of a tire casing equipped with an electronic system according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0024] FIG. 1 is a perspective view of an electronic component 10 that can be secured to a tire casing using a retention device according to the prior art.

[0025] An electronic component 10, shown here in gray, is defined by a protective housing 12 that encloses all of the electronic components of the electronic component 10. The protective housing 12 has an outer surface 30 that circumscribes a cylinder 17 having an axis of rotation 15 that is perpendicular to the printed circuitry of the electronic component 10. The cylinder 17 having the axis of rotation 15 is truncated at its top by two parallel flat surfaces 16 and 16' that rest on the axial outer surfaces 14 and 14' of the protective housing 12, respectively.

[0026] The protective housing 12 has a shape that combines a cone and a parallelepiped. The cone shape facilitates insertion into and removal from the holding device. The cone has a parallelepiped on one of its outer axial faces that houses the radio antenna. The radio antenna is enclosed in the protective housing 12. The protective housing 12 can be a monolithic part or a part assembled from multiple components that are subsequently welded together.

[0027] The component or monolithic part is obtained using a molding process from a plastic material, for example a thermosetting resin, and cold curing of the plastic completes the manufacture of the outer surface 30 of the protective housing 12.

[0028] FIG. 2 is a cross-sectional view in a radial plane of electronic system 1000 according to one embodiment of the present invention.

[0029] The electronic system 1000 consists of an electronic component 10 and a holding device 510 intended to be fixed to the wall of the tire casing.

[0030] The retaining device 510 includes a base 511 that can be fixed via its outer surface to the wall of the tire casing, and a closed retaining wall 512 for retaining the electronic component 10. The retaining wall 512 extends from the base 511 to a free edge 513, and thus defines a volume 520 together with the base 511. The volume 520 is open, so that the electronic component 10 can be inserted into and removed from the volume 520. The volume 520 is defined by an inner surface 515 of the retaining wall 512 and an inner surface 514 of the base 511. An opening 516 in the volume 520 is defined by the free edge 513 of the retaining wall 512. The opening 516 can be deformed to allow the electronic component 10 to be inserted into and removed from the volume 520.

[0031] 1, electronic component 10 includes a protective housing 12 that encloses all electronic components. This protective housing 12 defines an outer surface 30 that is circumscribed inside a cylinder having an axis of rotation 15 perpendicular to the median plane of the outer surface of base 511. This circumscribing cylinder is truncated by two parallel planes: a first plane belonging to inner surface 514 of base 511, and a second plane located axially outside opening 516 in retaining device 510.

[0032] 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 an extension that extends primarily radially rather than axially to form a retaining lip for holding the electronic component 10. One of the ends of the lip is the free edge 513. The other end 530 is a closed line, and its point has a vector tangent to the closed line and has a principal component along a radial direction relative to the rotation axis 15. The radial extension of the lip thus formed is measured from the closed line 530 to the free edge 513 by the radial distance r of the closed line 530 from the rotation axis 15. 530 The radial length of the lip contributes to retaining the electronic component 10 in the retaining device during high speed travel when the system 1000 is fixed to the wall of the tire casing. However, this radial length is also related to another feature of the electronic system that fully ensures this retention function.

[0033] Specifically, the protective housing 12 in this example has a cliff 50 extending outside the volume 520 of the holding device 510. This cliff 50 has a main component extending along the direction of the rotation 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 condition regarding the distance of the axial extension of the cliff 50 ensures that the electronic component 10 is better held within the holding device 510 by ensuring its positioning relative to the opening 516 of the holding device. Furthermore, the cliff 50 must be partially located in the immediate vicinity of the free edge 513 of the lip defined by the retaining wall 512. This ensures that the projection 517 of the free edge 513 in the axial direction 15 onto the outer surface 30 of the protective housing is tangent to the cliff 50 of the electronic component. Therefore, the positioning of the electronic component 10 within the holding device 510 is further restricted with respect to movement at least in a direction perpendicular to the tangent in the axial plane. Finally, to increase the potential fixation directions, contact between the cliff 50 and the projection 517 of the free edge 513 onto the outer surface 30 should occur over an angular sector around the axis of rotation 15. Here, contact is ensured over 180 degrees, thereby restricting the relative movement of the electronic component 10 within the holding device 510 over half of the possible movement. In application to tires of steered axles, a 120 degree sector is desirable to prevent cornering situations where the positioning of the electronic system 1000 within the tire is potentially optimized.

[0034] 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 the electronic component 10 will not be accidentally ejected from the retaining device 510 during normal use at high speeds when the electronic system 1000 is mounted on a vehicle tire.

[0035] Figure 3 is a top view of the electronic system 1000 of Figure 2, i.e., viewed axially from the same side of the electronic system 1000 as the opening of the volume of the retaining device 510 on the outside of the electronic system 1000.

[0036] Starting from the radial periphery of the electronic system 1000, first visible is the axially outer edge of the base 511, which in this case is circular but could also be elliptical or quadrilateral. Next, visible is a first circle 529 characterized by a change in curvature corresponding to the separation between the base 511 and the retaining wall 512, with material points on this circle 529 having tangents whose principal component is axial. Next, visible is a circle 530 corresponding to a closed line of the retaining wall 512, representing one end of the annular lip of the retaining wall 512. This lip terminates in a second circle 513 representing the free edge of the retaining wall 512. Next, between circles 530 and 513, there is a dotted first circle 17 corresponding to the radially outer surface of the circle surrounding the outer surface of the protective housing 12 of the electronic component 10.

[0037] Through the opening defined by circle 513, two semicircles 51 and 52 are visible, here corresponding to the axial ends of cliff 50 of protective housing 12 of electronic component 10. Thus, cliff 50 is primarily, but not exclusively, axial. Circle 51 is tangent to circle 513 throughout its entire semicircle, thus sweeping out a 180-degree angular sector about the axis of rotation of circumscribing cylinder 17 on the outer surface of protective housing 12. Here, the angular sector is divided into two 90-degree angular sectors, each by median plane 55, whose normal is collinear with vector V. As an aid to understanding, this top view is defined in axial planes U and V, whose normal corresponds to the axis of rotation of circumscribing cylinder 17. When electronic system 1000 is fixed to the wall of a tire casing, local vector U of the electronic system in FIG. 3 preferably corresponds to a circumferential direction vector of the cylindrical reference frame associated with the tire, about its natural axis of rotation. Therefore, when mounted on a vehicle, when the vehicle is in forward gear for forward movement and the tires are running along the road, the portion of the cliff 50 tangent to the free edge 513 of the retaining wall is located behind the rotation axis 15 of the electronic system 1000. As a result, the electronic component 10 is reliably held in the retaining device 510 with improved effectiveness.

[0038] 4 shows a cross section of a pneumatic tire 100, also a tire casing, according to the present invention, including a crown S extending by two sidewall portions F and terminating in two bead portions B. In this case, the tire 100 is intended to be mounted on a wheel (not shown) at the two bead portions B. As a result, the second radially inner surface 130 of the pneumatic tire 100 and the outer surface of the wheel together define an enclosed cavity containing at least one pressurized fluid. The pneumatic tire 100 also includes a first radially outer surface 140 of the pneumatic tire 100.

[0039] An axis corresponding to the reference axis or natural axis of rotation of the pneumatic tire 100 and a median plane 211 perpendicular to the reference axis 201 and equidistant from the two bead portions B are designated as the reference axis 201. The intersection of the reference axis 201 and the median plane 211 determines the center 200 of the pneumatic tire. A Cartesian frame of reference is defined at the center 200 of the pneumatic tire, consisting of the reference axis 201, a longitudinal axis 203 perpendicular to the ground, and a longitudinal axis 202 perpendicular to the other two axes. Furthermore, a plane passing through the reference axis 201 and the longitudinal axis 202, parallel to the ground plane, and perpendicular to the median plane 211 is designated as the axial plane 212. Finally, a plane passing through the longitudinal axis 203 and perpendicular to both the median plane 211 and the axial plane 212 is designated as the longitudinal plane 213.

[0040] Any material point of the pneumatic tire 100 is uniquely defined by its cylindrical coordinates (Y, R, θ). The scalar Y represents the axial distance to the center 200 of the pneumatic tire in the direction of the reference axis 201 and is defined by the orthogonal projection of the material point of the tire 100 onto the reference axis 201. A plane that is centered on the reference axis 201 and makes an angle θ with respect to a vertical plane 213 is defined as a radial plane 214. A material point of the pneumatic tire 100 is referenced in this radial plane 214 by its distance R to the center 200 of the pneumatic tire in a direction perpendicular to the reference axis 201, as identified by the orthogonal projection of the material point onto the radial axis 204. The unit vector perpendicular to the radial plane 214, which forms a rectangular trihedron with the axial 201 and radial 204 unit vectors, represents the circumferential direction of the tire casing 100. Note that FIG. 4 includes an arrow 300 assigned to the longitudinal axis 202 that indicates the direction of movement of the tire 100 when the tire 100 is mounted on a vehicle and the vehicle is moving forward.

[0041] The tire 100 has a retaining device 510 on its radially inner surface 130, which, when made of an elastomeric material, is secured to the surface 130 by adhesive bonding in accordance with conventional prior art techniques. The retaining device 510 is secured along the crown S of the tire casing 100, and such a placement of the retaining device 510 increases durability by minimizing problems during the mounting and dismounting of the tire casing 100 on a wheel. Specifically, the retaining device 510 is located in an area of ​​the tire casing 100 away from the bead B. In this case, the retaining device 510 includes the electronic component 10 within an open volume that forms a housing designed to receive the electronic component 10. As a result, in this case, the tire casing 100 is prepared for mounting on a wheel to form a wheel-tire assembly. The electronic component 10 can provide various functions, such as identifying itself and specific components, such as the tire. However, the electronic component can also include a pressure sensor and / or a temperature sensor to assess the air pressure of the wheel-tire assembly. Finally, the tire may also be equipped with sensors such as accelerometers or flexometers that can directly measure the curvature of the tire casing and derive typical tire variables such as angular velocity, distance traveled, and static load experienced, all of which allow the identification of performance qualities of the tire casing, such as tire casing wear, grip, or specific variables of the surface on which the tire casing is running.

[0042] In the example of Fig. 4, the electronic components of the electronic component 10 are enclosed in a protective housing. This protective housing has a cliff wall extending above the holding device 510. Here, the entire cliff wall is tangent to the free edge of the holding wall of the holding device 510. The free edge defines an opening in the holding device 510 that allows the electronic component 10 to be inserted into or removed from the storage volume of the holding device 510. In this particular case, the center of gravity of the point of the tangent line between the cliff wall of the electronic component 10 and the free edge of the holding device 510 is located on the axis of rotation of the electronic component 10, which corresponds to the particular case where the part of the cliff wall tangent to the free edge is located behind the axis of rotation of the electronic component. [Explanation of symbols]

[0043] 10 Electronic Materials 12 Protective housing 15 Rotation axis 30 Outer surface of protective housing 50 Cliff 510 Holding device 511 Base 512 Retaining Wall 513 Free edge of retaining wall 514 Inner surface of base 515 Inner surface of retaining wall 516 Volume Opening 517 Free Edge Projection 520 volume 530 Closed Line 1000 Electronic Systems e Height of the protruding element h Axial extension of cliff r Radial extension distance r 530 Radial distance of a closed line from the axis of rotation

Claims

1. An electronic system (1000) comprising an electronic component (10) and a holding device (510) for holding the electronic component (10), the holding device (510) being capable of being fixed to a wall of a tire casing, the holding device (510) comprising: a base (511) that can be fixed to the wall of said tire casing through its outer surface; a closed retaining wall (512) capable of retaining said electronic component (10), extending from said base (511) to a free edge (513) and defining, together with said base (511), an open volume (520); Equipped with the volume (520) capable of accommodating at least a portion of the electronic component (10) is defined by an inner surface (514) of the base (511) and an inner surface (515) of the retaining wall (512), and has an opening (516) defined by the free edge (513) of the retaining wall (512) that can be deformed for the insertion of the electronic component (10) into the volume (520); The electronic component (10) includes a protective housing (12) having an axis of rotation (15) perpendicular to the median plane of the outer surface of the base (511) of the holding device (510) and defining an outer surface (30) circumscribing the inside of a cylinder (17) defined by two parallel planes (16, 16'); 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) centered on the rotation axis (15) towards the rotation axis (15) of the cylinder (17) surrounding the outer surface (30) of the protective housing (12), points of the closed line (530) have tangent vectors with a principal component along a radial direction of a cylindrical reference frame associated with the cylinder (17), and the radial extension of the retaining wall (512) to each point of the free edge (513) is determined by a radial distance (r 530 ), the outer surface (30) of the protective housing (12) comprises a first cliff (50) radially inward of a projection (517) of the free edge (513) of the retaining wall (512) onto the outer surface (30) along the direction of the rotation axis (15), a portion of the first cliff (50) being tangent to the projection (517) of the free edge (513) onto the outer surface (30) over an angular sector, and the first cliff (50) having a major component along the direction of the rotation axis (15) extends along said direction over a distance (h) that is greater than twice the thickness (e) of the retaining wall (512) at the free edge (513) along the direction of the rotation axis (15). An electronic system (1000).

2. the first cliff (50) is tangent to the 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); The electronic system (1000) of claim 1.

3. the first cliff (50) is tangent to the 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); The electronic system (1000) of claim 2.

4. the first cliff wall (50) is tangent to the projection (517) of the free edge (513) of the retaining wall (512) onto the outer surface (30) along the axis of rotation (15) over the entire curved length of the projection (517) of the free edge (513) onto the outer surface (30); The electronic system (1000) of claim 3.

5. The electronic component (10) is a radio transmitter / receiver coupled to at least one radio antenna, and a microprocessor located on a printed circuit, coupled to said radio transmitter / receiver and powered by an energy source; It includes the element, The elements are enclosed in the protective housing (12). An electronic system (1000) according to any one of claims 1 to 4.

6. 6. An arrangement of an electronic system (1000) according to one of claims 1 to 5 and a tire casing (100) rotatable about a rotation axis (201), the tire casing (100) comprising a crown (S) and two sidewall portions (F) extending from the crown (S) and terminating in two bead portions (B) connectable to a wheel, the electronic system (1000) being fixed by the outer surface of the base (511) of the holding device (510) to one of the surfaces (130, 140) of the tire casing (100), preferably to the radially inner surface (130) of the tire casing (100). An arrangement characterized by:

7. The electronic system (1000) is fixed to the radially inner surface (130) of the tire casing (100) along the crown (S) of the tire casing (100).

7. The arrangement according to claim 6.

8. In a state where the tire casing (100) can rotate about the rotation axis (201) in a main direction corresponding to the direction of movement (300) of a forward moving vehicle equipped with the arrangement relative to the ground, when the electronic system (1000) is entirely within an angular sector of the tire casing (100) in contact with the ground, the center of mass of a point of the first cliff wall (50) of the protective housing (12) of the electronic component (10), which is tangent to the projection of the free edge (513) of the retaining wall (512) onto the outer surface (30), is located behind the rotation axis (15) of the cylinder (17) surrounding the protective housing (12) of the electronic component (10) in the direction of movement (300) of the vehicle.

8. The arrangement according to claim 7.

9. a median plane (55) of the portion of the first cliff wall (50) that is tangent to the projection of the free edge (513) of the retaining wall (512) onto the outer surface (30) and that defines an angular sector of the portion of the first cliff wall (50) into two equal angular sectors in a cylindrical reference frame related to the cylinder (17) that surrounds the protective housing (12) of the electronic component (10), has a normal having a principal component along the rotation axis (201) of the tire casing (100), the normal preferably being collinear with the rotation axis (201) of the tire casing (100); 9. The arrangement according to claim 8.

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