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 retaining wall (512) includes a protruding element (550) extending radially outward of the free edge (513) through a thickness (e) along the rotation axis (15), and the housing (12) includes a groove (51) defining a second volume (52) capable of accommodating the protruding element (550) of the retaining 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 thermally and mechanically 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 wall 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. 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 angular sector of the tire casing to which the patch is fixed changes its radius of curvature as it moves in and out of the contact patch, resulting in increased forces acting on the patch and the electronic components. This can lead to deformation of the fixing patch to the extent that electronic components mounted inside the patch are at least partially released from their accommodating 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 potentially 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 objective of the subject matter of the present invention below is to solve the problem of electronic components being ejected from the fixation patch in a manner that is economical, reliable, and 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 the median plane of the outer surface of the base of the holding device and defining an outer surface circumscribing the inside of a cylinder defined by two parallel planes, the retaining wall including a protruding element extending radially outward of its free edge relative to the axis of rotation and across the thickness of the cylinder surrounding the protective housing in the direction of the axis of rotation toward the volume of the holding device, the outer surface of the protective housing including, radially outward of the projection of the free edge of the retaining wall onto the outer surface, a continuous closed groove extending across an axial distance along the direction of the axis of rotation of the cylinder surrounding the protective housing, the groove defining a second volume capable of accommodating the protruding element, the protruding element extending across a radial distance included in the radial range of the groove relative to the axis of rotation.

[0007] Such a retaining device addresses the aforementioned technical challenges because the radial extensions of the retaining walls are provided with protruding elements, which provide a certain degree of rigidity at the locations of the protruding elements on the radial extensions, thereby energetically managing the deformation of the patch opening so that the electronic component cannot be easily removed from the fixing device. The absence of these protruding elements on the free edges also contributes to the retention of the electronic component because the radial extensions between the free edges of the retaining walls and the protruding elements must be removed before the protruding elements can be removed from the grooves. Therefore, the size of the radial extensions also affects the size of the opening defined by the free edges, thereby forcing the electronic component to remain within the opening volume. Furthermore, the presence and size of the continuous grooves on the protective housing of the electronic component form a fixation zone between the electronic component and the retaining device, thereby forcing the electronic component to remain within the open volume of the fixing device. Alternatively, the electronic component can be removed in advance using an external tool that enlarges the opening in the retaining wall by applying a uniform, specific load across the entire free edges to shrink the radial extensions of the retaining walls and remove them from the grooves. This tool is not present in 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 ground, cannot be uniform over the entire free edge of the retaining wall, no such forces are exerted on the system during use of the tire and at high speeds.

[0008] The projecting element of the retaining wall of the retaining device is preferably annular about the axis of rotation and extends angularly over the projection of the free edge onto the outer surface.

[0009] To take advantage of the mechanical locking provided by the continuous groove, it is preferred that the protruding element angularly covers the axis of rotation of the electronic component to ensure positioning of the electronic component within the holding device, the angular coverage of the protruding element being intermittent, i.e. the protruding element is made up of multiple cut pads at the same radial distance from the axis of rotation.

[0010] It is highly preferred that the cross section of the groove in the protective housing of the electronic component corresponds to the cross section of the projecting element of the holding device.

[0011] By creating a synergy between the cross-sectional shape of the groove and the cross-sectional shape of the protruding element, the contact surface area between the two elements is optimized, thus increasing the overall contact force that can be applied for the same degree of deformation of the most elastic element, i.e., the protruding element.

[0012] Advantageously, the cross section of the projecting element is one of the following: semicircular, semi-elliptical, or quadrilateral.

[0013] These shapes have the advantage that they provide a contact-force gradient by providing a non-linear contact force, thereby ensuring a better mechanical retention of the electronic component in the holding device. In particular, the holding walls are less likely to deform than geometric shapes that provide a linear progression, such as triangles. Furthermore, these convex shapes allow for economical production of the protruding elements on the holding device and the grooves on the protective housing, which shapes can be obtained, for example, by molding.

[0014] In one specific embodiment, the electronic component comprises: a wireless transmitter / receiver coupled to at least one wireless antenna; and a microprocessor located on the printed circuit board, coupled to the radio transmitter / receiver and powered by an energy source; said elements being enclosed in a protective housing.

[0015] 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, and the operations and calculations performed in the microprocessor may also require energy. Regarding the calculation function, the microprocessor has a fairly high level of computing power, for example, for processing measurement data coming 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 mounting device.

[0016] According to a particular embodiment, the distance of the groove is greater than half the thickness of the projecting element, and preferably greater than the thickness of the projecting element.

[0017] The groove preferably extends along the direction of the axis of rotation of the cylinder surrounding the protective housing over a distance equal to the thickness of the projecting element along this direction.

[0018] Specifically, because the groove can initially contact the protruding element and accommodate it within the second volume as a result of its geographical proximity, a strong interaction between the two initially non-contacting elements is created, thus increasing overall mechanical strength. Naturally, the larger the contact area between the two elements, the greater the force generated by this contact given the same degree of deformation. As a result, more deformation energy is required to eject the electronic component from the retaining device. If the axial distance of the groove is at least half the thickness of the protruding element, the mechanical locking created by the interaction between the two components is sufficient to retain the electronic component within the retaining device. If the groove is deeper than the thickness of the protruding element, the protruding element is not compressed, and the groove volume is sufficient axially to accommodate the protruding element without exposing it to stress, improving mechanical retention of the protruding element. The ideal intermediate case is when the axial distance of the groove corresponds to the thickness of the protruding element. This is because the mechanical locking between the two components is maximized across the entire thickness of the protruding element while simultaneously minimizing the preload on the protruding element.

[0019] The mechanical fixation between the protruding element and the groove is controlled by the depth of the groove. The greater the depth, the greater the mechanical locking force of the retaining wall in the groove of the electronic component. The mechanical strength of this locking has a threshold controlled by the thickness of the protruding element present in the groove along the rotational axis of the cylinder surrounding the protective housing. Ensuring that the depth of the groove is at least half the thickness of the protruding element provides sufficient additional deformation energy for the extraction of the electronic component, increasing the mechanical strength of the electronic system.

[0020] According to a preferred embodiment, the projecting elements of the holding wall of the holding device are continuous and closed.

[0021] The continuous annular shape of the groove means that the contact surface area between the protruding element and the groove is increased, and the dimensions of the protruding element match the curvilinear length of the groove. This continuous shape of the protruding element ensures that stress is continuous, while improving the mechanical lock between the protruding element and the groove by increasing the contact area and distributing deformation energy over a wider surface area. This results in better mechanical retention of the protruding element, facilitating high-speed driving and extending the service life of the electronic system before ejection from the retention device due to localized fracture of a portion of the protruding element, which could occur if the protruding element were segmented. Additionally, the axial symmetry of the protruding element means that the electronic system can be freely positioned within an object such as a tire casing without risk of ejection.

[0022] 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.

[0023] Advantageously, the electronic system is fixed to the radially inner surface of the tire casing, the axial position of the electronic system being included in the axial extent of the crown (S) of the tire casing.

[0024] 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.

[0025] In a state in which the tire casing can rotate about a rotation axis 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 the center of gravity of the point of the protruding element of the retaining wall of the retaining device in the axial plane is located rearward, in the direction of movement of the vehicle, of the axis of rotation of the cylinder surrounding the protective housing of the electronic component, when the electronic system is entirely within the angular sector of the tire casing in contact with the ground.

[0026] When the tire is used for forward travel and the travel speed is very high, the positioning of the protruding elements of the retaining wall relative to the rotation axis of the cylinder surrounding the protective housing ensures that contact between the protruding elements and the grooves occurs immediately upon entry into the ground, regardless of the shape or positioning of the protruding elements. As a result, the reaction force caused by this contact opposes the ejection of the electronic components from the retaining device. 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.

[0027] The expression "behind" here means that the two points are spaced apart in said direction by a distance d, which may be zero.

[0028] It is highly preferred that the median plane of the protruding element, which defines the angular sector of the protruding element into two equal angular sectors in a cylindrical reference frame relative to the cylinder surrounding the protective housing of the electronic component, has a normal having a principal component along the axis of rotation of the tire casing, the normal preferably being collinear with the axis of rotation of the tire casing.

[0029] 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 the steered axle of the vehicle, the protruding element is preferably angularly centered so that contact is equally good when driving straight as when cornering to the right or left.

[0030] 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]

[0031] [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 the present invention; [Figure 3] 1 is a view of an electronic system according to the invention from above, i.e. from the same side as the opening of the cavity of the holding device; [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

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

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

[0037] 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.

[0038] The holding device 510 comprises a base 511 that can be fixed via its outer surface to the wall of the tire casing, and a closed holding wall 512 for holding 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. In this case, a protruding element 550 is arranged on the holding wall 512 in the direction of the volume 520. In this case, this element 550 has the shape of a continuous closed ring centered on the axis of rotation 15 and having a semicircular cross section. The height of this protruding element 550 is indicated by "e" along the direction of the axis 15. 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 holding wall 512 and an inner surface 514 of the base 511. An opening 516 of the volume 520 is defined by the free edge 513 of the holding wall 512. The opening 516 is deformable to allow insertion and removal of the electronic component 10 from the volume 520 .

[0039] 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.

[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 an extension that extends primarily radially rather than axially so as to form 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 closed line whose point has a vector tangent to the retaining wall 512 and has a primary component along a radial direction relative to the rotation axis 15 starting from the base 511. The radial extension of the lip thus formed extends from the closed line 530 to the free edge 513 and includes a protruding element 550, which 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 a tire casing. In particular, a protruding element 550 that is continuous or intermittent and extends angularly over the entire free edge 513 of the retaining wall means that more energy is required to deform this lip, which contributes to retaining the electronic component 10 in the retaining device 510. On the other hand, the application of a sustained and targeted force opens the lip, allowing the removal and insertion of the electronic component 10 into and out of the retaining device 510. Notably, this force needs to be uniform over the entire free edge 513, a force that does not naturally occur as the angular sector of the tire casing carrying the electronic system moves in and out of the ground during travel.

[0041] In particular, the protective housing 12 in this case has a cliff 50 that extends outside the volume 520 of the holding device 510. This cliff 50 has a main component that extends along the direction of the axis of rotation 15.

[0042] The outer surface 30 of the protective housing 12 has a groove 51 located on a protruding element 550. The groove 51 defines an annular recess of semicircular cross section about the axis of rotation 15, and the radial extension r of the protruding element 550 S a distance greater than r R The groove 51 extends radially over a distance "e'" that is greater than half the thickness "e" of the protruding element 550. The groove 51 defines a second volume 52 that can accommodate the protruding element 550.

[0043] The size of the lip defined by the retaining wall 512 having a free edge 513 with a protruding element 550, in combination with the size of the groove 51 along the protruding element 550, ensures that the electronic component 10 is not accidentally ejected from the retaining device 510 during normal use at high speeds when the electronic system 1000 is mounted on a vehicle tire.

[0044] 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.

[0045] Starting from the radial periphery of the electronic system 1000, first visible is the outer axial edge of the base 511, which in this case is circular but could also be elliptical or quadrilateral. Next, a first circle 529 is visible, characterized by a change in curvature corresponding to the separation between the base 511 and the retaining wall 512. Material points on this circle 529 have vectors tangent to the base 511 whose principal component, starting from the base 511, is axial instead of radial. Next, a circle 530 is visible, corresponding to a closed line on 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. Between the circles 530 and 513, there is then a first circle 17, shown in dotted lines, corresponding to the radial outer surface of the circle surrounding the outer surface of the protective housing 12 of the electronic component 10. Next, moving inward towards the electronic component 10, there are four dotted circles 551 to 554. Circles 551 and 554 define a continuous closed groove 51 in the radial direction. Circles 552 and 553 define a protruding element 550 axially above the lip.

[0046] Through the opening defined by circle 513, circle 53 is visible, which here defines the axial end of cliff 50 of protective housing 12 of electronic component 10. Consequently, cliff 50 is primarily axial. Projecting element 550, defined by circles 552 and 553, is annular and continuous. Here, the angular extension of the projecting element is divided into two 180-degree angular sectors by median plane 55, whose normal is collinear with vector V. To aid 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, centered on its natural axis of rotation. Therefore, when mounted on a vehicle, when the tire is running along the road with the vehicle in forward gear for moving forward, the center of mass of the point of the protruding element 550 of the retaining wall 512 in the axial plane is located at the height of the rotation axis of the electronic system 1000, and therefore behind the rotation axis, thereby ensuring an improved retention of the electronic component 10 in the retaining device 510.

[0047] 4 shows a cross section of a pneumatic tire 100, which is 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. Thus, 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.

[0048] An axis corresponding to the reference axis or natural rotation axis 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 of the pneumatic tire 100. A Cartesian frame of reference is defined at the center of the pneumatic tire 100, and is composed 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.

[0049] Any material point on the pneumatic tire 100 is uniquely defined by its cylindrical coordinates (Y, R, θ). The scalar Y represents the axial distance to the center of the pneumatic tire 100 in the direction of the reference axis 201 and is defined by the orthogonal projection of the material point on 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 on the pneumatic tire 100 is referenced in this radial plane 214 by its distance R to the center of the pneumatic tire 100 in a direction perpendicular to the reference axis 201, as identified by the orthogonal projection of the material point on 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 pneumatic tire 100 when the pneumatic tire 100 is mounted on a vehicle and the vehicle is moving forward.

[0050] 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, static load experienced, etc. All these variables allow the identification of performance qualities of the tire casing, such as wear, grip, or specific variables of the surface on which the tire casing is running.

[0051] In the example of Fig. 4, the electronic components of the electronic component 10 are enclosed in a protective housing. This protective housing has an annular groove extending below the protruding elements of the holding device 510. In this case, the protruding elements are discontinuous and are in the form of a single protruding pad representing an angular sector of 120 degrees around the axis of rotation. The angular orientation of the electronic system 1000 is intended, on the one hand, to position the pad so that it penetrates the ground first, i.e. so that the center of gravity of the point of the protruding element in the radial plane is located behind the axis of rotation of the electronic component 10. On the other hand, the median surface of this pad is positioned in the circumferential direction of the tire in order to optimize the contact that occurs between the groove and the pad when the vehicle turns right or left. [Explanation of symbols]

[0052] 10 Electronic Materials 12 Protective housing 15 Rotation axis 30 Outer surface of protective housing 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 550 Protruding elements 1000 Electronic Systems e Height of the protruding element e' Axial distance of the groove r R Groove Radial Extent r S Groove Radial Distance

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 retaining wall (512) includes a protruding element (550) that extends radially outward of the free edge (513) relative to the rotation axis (15) toward the volume (520) of the retaining device (510) over a thickness (e) in the direction of the rotation axis (15) of the cylinder (17) surrounding the protective housing (12), and the outer surface (30) of the protective housing (12) is in contact with the outer surface (30) of the retaining wall (512). The protective housing (12) includes, radially outward of a projection (517) of the free edge (513), a continuous closed groove (51) extending over an axial distance (e') along the direction of the rotation axis (15) of the cylinder (17) surrounding the protective housing (12), the groove (51) defining a second volume (52) capable of accommodating the protruding element (550), the protruding element (550) having a radial extent (r R ) radial distance (r S ) extending over An electronic system (1000).

2. the protruding element (550) of the retaining wall (512) of the retaining device (510) is annular about the axis of rotation (15) and extends angularly over the projection (517) of the free edge (513) onto the outer surface (30); The electronic system (1000) of claim 1.

3. the cross section of the groove (51) of the protective housing (12) of the electronic component (10) corresponds to the cross section of the protruding element (550) of the holding device (510); 3. An electronic system (1000) according to claim 1 or 2.

4. The cross section of the protruding element (550) is one of a semicircular, semi-elliptical, and quadrilateral. An electronic system (1000) according to one of claims 1 to 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 one of claims 1 to 4.

6. the distance (e') of said groove (51) is greater than half the thickness (e) of said protruding element (550), preferably said distance (e') is greater than the thickness (e) of said protruding element (550); An electronic system (1000) according to any one of claims 1 to 5.

7. the groove (51) extends along the direction of the axis of rotation (15) of the cylinder (17) surrounding the protective housing (12) over a distance (e') equal to the thickness (e) of the protruding element (550) along said direction; The electronic system (1000) of claim 6.

8. the protruding elements (550) of the retaining wall (512) of the retaining device (510) are continuous and closed; An electronic system (1000) according to one of claims 2 to 7.

9. 9. The arrangement of an electronic system (1000) according to one of claims 1 to 8 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 retention 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:

10. The electronic system (1000) is fixed to the radially inner surface (130) of the tire casing (100), and the axial position of the electronic system is included in the axial range of the crown (S) of the tire casing (100).

10. The arrangement according to claim 9.

11. In a state where the tire casing (100) can rotate about a rotation axis (201) in a main direction corresponding to the direction of movement (300) of a forward moving vehicle equipped with said 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 gravity of the point of the protruding element (550) of the retaining wall (512) of the retaining device (510) in an axial plane is located rearward, in the direction of movement (300) of the vehicle, of the rotation axis (15) of the cylinder (17) surrounding the protective housing (12) of the electronic component (10).

11. The arrangement according to claim 10.

12. a median plane of the protruding element (550) that defines an angular sector of the protruding element (550) into two equal angular sectors in a cylindrical reference frame relative to the cylinder (17) surrounding 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); 12. The arrangement according to claim 11.

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