Device for attaching an electronic component to a pneumatic casing
The retaining device with a projecting element and groove design addresses the mechanical strength issue in fixing devices, ensuring secure attachment of electronic components in pneumatic casings, particularly during high-speed driving.
Patent Information
- Application Number
- FR2022013311
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2022-12-14
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2042-12-14
AI Technical Summary
Existing fixing devices for electronic components in pneumatic casings face issues with mechanical strength, leading to ejection of the components during high-speed driving, which can damage both the component and the casing.
A retaining device with a projecting element and a continuous groove design that enhances mechanical anchoring, ensuring the electronic component remains secured within the device by requiring uniform force application for extraction, preventing ejection during high-speed conditions.
The solution provides robust mechanical anchoring, preventing untimely ejection of electronic components, even at high speeds, while maintaining functionality and reducing damage to the component and casing.
Smart Images
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Abstract
Description
Title of the invention: Device for fixing an electronic component to a PNEUMATIC casing Field of the invention
[0001] The present invention relates to devices for attaching an electronic component to a pneumatic casing for the purpose of conveying identification information on the pneumatic casing or physical parameters of the pneumatic casing measured by the electronic component during the life of the pneumatic casing. Technological background
[0002] The development of electronic objects in pneumatic envelopes makes it possible to make pneumatic envelopes connectable and connected, which leads to the development of new services in order to optimize, for example, the use of the pneumatic envelope. However, these electronic components sometimes include thermomechanically fragile components, which requires the introduction of the electronic component after the manufacture of the pneumatic envelope. Thus, the introduction of a fixing device as an interface between the electronic component and the tire has emerged. These fixing devices are generally elastic so as not to strongly constrain the pneumatic envelope, to follow the strong deformations undergone by the pneumatic envelope during its use and to absorb the stresses transmitted to the electronic component.One of the most commonly used device designs is a patch having a sole serving as an attachment to the pneumatic envelope and provided with a self-enclosed wall extending from the sole to an opening. The wall serves to grip or hold the electronic member in position within the device, the electronic member being mounted tightly inside the wall which deforms elastically. The opening allows the insertion and extraction of the electronic member from the patch thanks to the elasticity of the wall material.
[0003] Document WO2018 / 150141A1 illustrates a patch of this nature. Although this patch specifically has a clamping system in order to limit the opening, it is in all respects consistent with a patch for fixing to a pneumatic casing of an electronic object. This type of patch sometimes presents a problem of mechanical strength of the system comprising the patch and the electronic member during use of the pneumatic casing on which this system is fixed. In particular under high-speed driving conditions, the forces generated at the patch and the electronic member due to the change in radius of curvature at the moment when the sector The angular displacement of the tire casing where the patch is attached enters or leaves the contact area are significant. This sometimes leads to such deformation of the fixing patch that the electronic component mounted inside the patch is at least partially removed from the patch's receiving cavity, which ultimately leads to the ejection of the electronic component from the patch. This ejection of the electronic component, generally destructive for the electronic component, can also alter the very structure of the tire casing by the projection of the electronic component onto the walls of the tire, particularly at high speed.
[0004] The following objects of the invention aim to solve the problems of ejecting the electronic member from the fixing patch. The solutions must be economical, reliable and without impact on the operation of the electronic member housed within the fixing patch. Description of the invention
[0005] The invention relates to an electronic system comprising an electronic member and a device for retaining the electronic member capable of being fixed to a wall of a pneumatic casing, said retaining device comprising: • a sole capable of being fixed to the wall of the pneumatic casing via an external surface, • a closed retaining wall, capable of retaining said electronic component, extending from the sole to a free edge and defining with said sole an open volume, • said volume, capable of accommodating at least part of said electronic member, being defined by an internal surface of said sole and by an internal surface of said retaining wall, having an opening delimited by the free edge of said retaining wall, capable of deforming to introduce said electronic member into said volume; said electronic member comprising a protective housing defining an external surface circumscribed in a cylinder whose axis of revolution is perpendicular to the median plane of the external surface of the sole of said retaining device and delimited by two parallel planes;and characterized in that the retaining wall comprises a projecting element located radially outside the free edge relative to the axis of revolution and extending towards the volume of the retaining device over a thickness in the direction of the axis of revolution of the cylinder circumscribed to the protective housing, in that the outer surface of the protective housing comprises a continuous and closed groove located radially outside the projection of the free edge of the retaining wall on the outer surface in the direction of the axis of revolution of the cylinder circumscribed to the protective housing and extending over an axial distance, in that the groove defines a second volume capable of receiving the projecting element and in this; that the projecting element extends over a radial distance included in the radial extent of the groove relative to the axis of revolution.
[0006] Such a retaining device makes it possible to address the technical problem posed since the radial extension of the retaining wall is equipped with a projecting element, which ensures a certain rigidity of the radial extension at the location of this projecting element and therefore ensures energy control of the deformation of the opening of the patch which does not allow easy ejection of the electronic member from the fixing device. The fact of not locating this projecting element at the free edge also contributes to maintaining the electronic member since before freeing the projecting element from the groove, it is necessary to fold down the radial extension of the retaining wall between its free edge and the projecting element. Thus, the dimensioning of the radial extension also controls the dimension of the opening delimited by the free edge, which forces the electronic member to remain inside the open volume.And, the presence and dimensioning of the continuous groove on the protective housing of the electronic component creates a blocking zone between the electronic component and the retaining device, which then forces the electronic component to remain inside the open volume of the retaining device. However, the extraction of the electronic component remains possible by means of an external tool which first enlarges the opening of the retaining wall by applying a specific uniform force over the entire free edge to reduce the radial extension of the retaining wall and remove it from the groove.During use of the tire and even at high speed, such a force cannot be applied to the system due to the absence of the tool in the tire and the specificity of the external force applied to the system at the time of impact when entering the contact area of the angular sector of the tire on which the electronic system is fixed which cannot be uniform over the entire free edge of the retaining wall.
[0007] Preferably, the projecting element of the retaining wall of the retaining device is annular around the axis of revolution and extends angularly over the entire projection of the free edge on the external surface.
[0008] In order to benefit from the mechanical anchoring provided by the continuous groove, it is preferable for the projecting element to angularly cover the axis of revolution of the electronic member in order to ensure positioning of the electronic member within the retaining device. The angular coverage of the projecting element may be discontinuous, that is to say that the projecting element is made up of several disjoint pads located radially at the same distance from the axis of revolution.
[0009] Very preferably, the section of the groove of the protective housing of the electronic component is the counter-shape of the section of the projecting element of the retaining device.
[0010] By ensuring a synergy between the shape of the section of the groove and that of the section of the projecting element, the contact surface between the two elements is optimized, which increases the overall contact force applicable for the same level of deformation of the most elastic element, i.e. the projecting element.
[0011] Advantageously, the section of the projecting element is included in the group comprising a semicircle, a semi-ellipse, a quadrilateral.
[0012] These shapes have the advantage of having a non-linear contact force which makes it possible to have a contact force gradient, which ensures better mechanical strength of the electronic component in the retaining device. Indeed, the deformation of the retaining wall is less easy than with a geometric shape ensuring linear progression such as a triangle. In addition, these convex shapes make it possible to produce the projecting element on the retaining device and the groove on the protective housing economically, the shapes being able to be obtained by molding for example.
[0013] In a specific embodiment, the electronic member comprising the following elements: • a radio transmitter / receiver coupled to at least one radio antenna; • a microprocessor located on a printed circuit, coupled to the radio transmitter / receiver and powered by an energy source, said elements are encapsulated in the protective casing.
[0014] The electronic component here comprises a radiofrequency transponder, i.e. it comprises radiofrequency transmission / reception communication components for capturing an order and responding to this order. Here the radiofrequency transponder is active, i.e. it comprises an energy source used mainly to transmit the response by radiofrequency communication. Indeed, radiofrequency transmission is an energy-consuming functionality for large responses, such as, for example, the transmission of measurement data, but the operations and calculations at the level of a microprocessor can also be energy-intensive. For the calculation functionality, the microprocessor has more or less sophisticated calculation capabilities for processing measurement data coming from a measurement sensor, for example, connected to the microprocessor.It should be noted that the energy source, which may be a battery, for example, may be bulky but also massive, which results in significant centrifugal forces and significant impact forces which may cause the electronic component to be accidentally ejected from the fixing device.
[0015] According to a particular embodiment, the distance of the groove is greater than half the thickness of the projecting element, preferably the distance is su- greater than the thickness of the projecting element.
[0016] Preferably, the groove extends in the direction of the axis of revolution of the cylinder circumscribed to the protective housing over a distance identical to the thickness of the projecting element in said direction.
[0017] Indeed, the groove being in first contact with the projecting element by their geographical proximity and being able to accommodate the projecting element inside the second volume, a strong interaction will take place between the two initially disjointed elements which improves the mechanical strength of the assembly. Of course, the larger the contact surface between the two elements, the greater the force resulting from this contact for the same level of applied deformation. As a result, the ejection of the electronic member from the retaining device requires more deformation energy. If the axial distance of the groove is at least half the thickness of the projecting element, the mechanical anchoring generated by the interaction between the two components is sufficient to retain the electronic member within the retaining device.When the groove is deeper than the thickness of the protruding element, no compression of the protruding element is observed, the volume of the groove is sufficient axially to accommodate the protruding element without stress, which improves the mechanical strength of the protruding element. The intermediate case is ideal when the axial distance of the groove corresponds to the thickness of the protruding element. Indeed, the mechanical anchoring between the two components is maximum over the entire thickness of the protruding element while minimizing the prestresses of the protruding element.
[0018] The mechanical locking between the protruding element and the groove is controlled by the depth of the groove. The greater the depth, the greater the mechanical anchoring force of the retaining wall in the groove of the electronic component. The mechanical resistance of this anchoring has a threshold which is controlled by the thickness of the protruding element present in the groove in the direction of the axis of revolution of the cylinder circumscribed to the protective housing. Ensuring that the depth of the groove is at least half the thickness of the protruding element ensures additional deformation energy to extract the electronic component sufficient to improve the mechanical strength of the electronic system.
[0019] According to a preferred embodiment, the projecting element of the retaining wall of the retaining device is continuous and closed.
[0020] Since the groove is continuous and annular, the contact surface between the projecting element and the groove is increased by sizing the projecting element to the curvilinear length of the groove. This continuous shape of the projecting element improves the mechanical anchoring between the projecting element and the groove by increasing the contact surface between the two and by distributing the deformation energy over a larger area. surface while ensuring continuity of constraints. This guarantees better mechanical strength of the protruding element, which is favorable for high-speed driving and allows the service life of the electronic system to be extended before ejection of the electronic component from the retaining device by localized rupture of a part of the protruding element, which could occur if the protruding element is discontinuous in pieces. In addition, the axisymmetry of the protruding element provides independence of the positioning of the electronic system within an object such as a pneumatic envelope with regard to the risk of ejection of the electronic component.
[0021] The invention also relates to an arrangement of an electronic system and a pneumatic casing being capable of rotating around an axis of rotation, said pneumatic casing comprising a top (S), two flanks (F) extending from the top (S) and ending in two beads (B) capable of being connected to a wheel, in which the electronic system is fixed by means of the external surface of the sole of the retaining device on one of the surfaces of the pneumatic casing, preferably on the radially internal surface of the pneumatic casing.
[0022] Advantageously, the electronic system is fixed on the radially inner surface of the pneumatic casing and the axial position of the electronic system is included in the axial extent of the top (S) of the pneumatic casing.
[0023] This arrangement is the final destination of the electronic system which is the first object of the invention. The electronic system comprising an electronic member, it is not possible to install this electronic member within the raw blank of the tire casing. Indeed, the electronic member would support the thermomechanical constraints associated with the manufacturing process of a tire casing. Usually, it is preferable to install the electronic system after manufacturing the tire. Therefore, this electronic system is positioned on one of the surfaces, which are by nature external, of the tire casing. Preferably, the electronic system is positioned on the radially internal surface of the tire casing relative to the natural axis of rotation of the tire casing.Thus, the electronic component is protected, in use condition on the tire, by the rubber structure of the tire, which improves the mechanical endurance of the electronic component. The positioning at the top allows easy access to measurement characteristics via a sensor of the electronic component associated with the contact area, which makes it possible to trace back to usage characteristics of the tire such as the static load applied, the rolling speed.
[0024] Preferably, the pneumatic casing being able to rotate around the axis of rotation in a main direction corresponding to a direction of movement relative to a floor of a vehicle equipped with said arrangement in forward motion, the barycenter of the points of the projecting element of the retaining wall of the retaining device in an axial plane is positioned behind the axis of revolution of the cylinder circumscribed to the protective housing of the electronic component following the direction of movement of the vehicle when the electronic system is located entirely in an angular sector of the pneumatic envelope in contact with the ground.
[0025] In the case of using the tire in forward gear which can be carried out at very high rolling speed, the positioning of the projecting element of the retaining wall relative to the axis of revolution of the cylinder circumscribed to the protective housing guarantees that the contact between the projecting element and the groove will take place immediately at the level of the entry into the contact area and this whatever the shape or positioning of the projecting element. As a result, the reaction force exerted by this contact will oppose the ejection of the electronic member from the retaining device. Thus, the orientation of the electronic system in the tire casing when it is positioned at the top (S) of the tire casing is an influential factor in the non-ejection of the electronic member in particular at very high speed. Rolling at high and very high speed on the vehicle is carried out in forward gear of the vehicle.
[0026] Here, the expression “behind” means that the two points are spaced by a distance d along said direction and that this distance d can be zero.
[0027] Very preferably, the median plane of the projecting element, delimiting the angular sector of the projecting element into two equal angular sectors in the cylindrical reference frame associated with the cylinder circumscribed to the protective housing of the electronic component, has its normal having a main component along the axis of rotation of the pneumatic casing, preferably its normal is collinear with the axis of rotation of the pneumatic.
[0028] In order to ensure that the technical solution envisaged for retaining the electronic member of the fixing device is effective in all types of vehicle usage conditions, in particular when the pneumatic casing is mounted on the steering axle of the vehicle, it is preferable to angularly center the projecting element so that contact occurs both in a straight line and when turning right or turning left. Brief description of the drawings
[0029] The invention will be better understood on reading the following description given solely by way of non-limiting example and made with reference to the appended figures in which the same reference numbers designate identical parts throughout and in which: • [Fig.l] shows a perspective view of an electronic organ, capable of be attached to a tire by means of a state-of-the-art retaining device; • [Fig.2] shows a sectional view of the radial plane of the electronic system according to the invention; • [Fig.3] shows a top view of the electronic system of the invention, that is to say from the side of the opening of the cavity of the retaining device; • [Fig.4] shows a perspective and sectional view of a pneumatic envelope equipped with an electronic system according to the invention. Detailed description of embodiments
[0030] [Fig.l] is a perspective view of an electronic member 10, capable of being fixed using a retaining device to a pneumatic casing, of the state of the art.
[0031] The electronic component 10, shown here in gray, is delimited by a protective housing 12 encapsulating all of the electronic components of the electronic component 10. This protective housing 12 has an outer surface 30 circumscribed by a cylinder 17 having an axis of revolution 15 which is perpendicular to the printed circuit of the electronic component 10. This cylinder 17, having an axis of revolution 15, is truncated by two parallel planes 16 and 16' which rest respectively on the axially outer surfaces 14 and 14' of the protective housing 12.
[0032] This protective housing 12 is presented as the combination of a cone and a parallelepiped. The conical shape facilitates its insertion or extraction from a retaining device. The cone has on one of its axially external surfaces a parallelepiped which accommodates the radio antenna. This is also encapsulated in the protective housing 12. The protective housing 12 is a monolithic part or a part assembled in several parts, the parts then being welded together.
[0033] The parts or the monolithic piece are obtained for example using a molding process from a plastic material such as a thermoset. The low temperature cooking of the plastic results in the final production of the outer surface 30 of the protective housing 12.
[0034] [Fig.2] is a sectional view of the radial plane of an electronic system 1000 according to the invention.
[0035] The electronic system 1000 consists of an electronic member 10 and a retaining device 510 intended to be fixed to the wall of a pneumatic envelope.
[0036] The retaining device 510 comprises a sole 511 capable of being fixed to the wall of a pneumatic casing by means of an external surface and a closed retaining wall 512 whose function is to retain said electronic member 10. The retaining wall 512 extends from the sole 511 to a free edge 513, thus defining with the sole 511 a volume 520. Here, a projecting element 550 is positioned on the retaining wall 512 in the direction of the volume 520. This element 550 is in the form of a ring, which is here continuous and closed, around the axis of revolution 15 having a semi-circular section. The height of this projecting element 550 is noted “e” in the direction of the axis 15. This volume 520 is open thus allowing the insertion and extraction of the electronic member 10 within the volume 520. The volume 520 is defined by the internal surface 515 of the retaining wall 512 and the internal surface 514 of the sole 511. The opening 516 of the volume 520 is delimited by the free edge 513 of the retaining wall 512. This opening 516 is capable of deforming to allow the insertion and extraction of the electronic member 10 within the volume 520.
[0037] As in [Fig.l], the electronic member 10 comprises a protective housing 12 encapsulating all of the electronic components. This protective housing 12 defines an external surface 30. This external surface 30 is circumscribed in a cylinder whose axis of revolution 15 is perpendicular to the median plane of the external surface of the sole 511. The circumscribed cylinder is truncated by two parallel planes, the first of which is similar to the internal surface 514 of the sole 511 and the second plane is located axially external to the opening 516 of the retaining device 510.
[0038] The retaining wall 512 extending axially from the sole 511 to the free edge 513. The part of the retaining wall 512 comprising the free edge 513 has a predominantly radial rather than axial extension in order to constitute a retaining lip for the electronic member 10. One of the ends of the lip is the free edge 513. The other end 530 is a closed line whose points have a vector tangent to the retaining wall 512 having a predominant component in the radial direction relative to the axis of revolution 15 coming from the sole 511. The radial extension of the lip thus formed extends from the closed line 530 to the free edge 513 comprises the projecting element 550 and contributes to maintaining the electronic member 10 within the retaining device when traveling at high speeds when the system 1000 is fixed to the wall of a pneumatic envelope.Indeed, the projecting element 550, which is continuous or discontinuous, extending angularly over the entire free edge 513 of the retaining wall makes the deformation of the lip more energetic, which contributes to the retention of the electronic member 10 within the retaining device 510. However, the application of a directed and sustained force allows the opening of the lip for the extraction and insertion of the electronic member 10 from the retaining device 510. In particular, this force must be uniform over the entire free edge 513, which does not conventionally occur when the angular sector of the pneumatic casing carrying the electronic system enters or leaves the contact area during rolling.
[0039] Indeed, the protective housing 12 here has a cliff 50 extending outward prior to the volume 520 of the retaining device 510. This cliff 50 has its main component which extends in the direction of the axis of revolution 15.
[0040] The external surface 30 of the protective housing 12 has a groove 51 which is located at the level of the projecting element 550. This groove 51 defines an annular hollow of semi-circular section around the axis of revolution 15 extending radially over a distance rR greater than the radial extension rs of the projecting element 550. In addition, the groove 51 extends axially over a distance denoted “e'” greater than half the thickness “e” of the projecting element 550. This defines a second volume 52 capable of receiving the projecting element 550.
[0041] The combination of the dimensioning of the lip defined by the retaining wall 512 with its free edge 513 provided with a projecting element 550 and the dimensioning of the groove 51 in line with the projecting element 550 guarantees non-untimely ejection of the electronic member 10 of the retaining device 510 in normal use at high speeds when the electronic system 1000 is installed on a tire of a motor vehicle.
[0042] [Fig. 3] is a top view of the electronic system 1000 of [Fig. 2]. That is to say that externally to the electronic system 1000, it is observed from the side of the opening of the volume of the retaining device 510 in the axial direction.
[0043] From the radial periphery of the electronic system 1000, we first visualize the axially outer edge of the sole 511 which is here circular, the outer edge of the sole 511 could also be elliptical or quadrilateral. We then visualize a first circle 529 which corresponds to the separation between the sole 511 and the holding wall 512 which is characterized by a change in curvature and the material points of this circle 529 which have a vector tangent to the sole 511 whose main component becomes axial by being radial coming from the sole 511. Then we visualize a circle 530 corresponding to the closed line of the holding wall 512 which represents one end of the annular lip of the holding wall 512. This lip ends with a second circle 513 which represents the free edge of the holding wall 512.Then, between the circles 530 and 513, there is a first dotted circle 17 corresponding to the radially outer surface of the circle circumscribed to the outer surface of the protective housing 12 of the electronic member 10. There are then four circles 551 to 554 in dotted lines heading towards the electronic member 10. The circles 551 and 554 radially delimit the groove 51 which is continuous and closed. The circles 552 and 553 delimit the projecting element 550 which is located axially above the lip.
[0044] Through the opening delimited by the circle 513, a circle 53 is observed delimiting the axial end of the cliff 50 of the protective housing 12 of the electronic member 10. Thus, this cliff 50 is predominantly axial. The projecting element 550 delimited by the circles 552 and 553 is annular and continuous. Here, the angular extension of the projecting element is separated into two angular sectors of 180 degrees each by the median plane 55 whose normal is collinear with the vector V. For reasons of understanding this top view is defined in an axial plane U, V whose normal corresponds to the axis of revolution of the circumscribed cylinder 17. Once the electronic system 1000 is fixed on the wall of a pneumatic casing, it is preferable that the local vector U of the electronic system of [Fig.3] corresponds to the direction vector of the circumferential direction of the cylindrical reference frame associated with the tire around its natural axis of rotation.Thus, once mounted on the vehicle, the barycenter of the points of the projecting element 550 of the retaining wall 512 in an axial plane is located at the level of, therefore behind, the axis of revolution of the electronic system 1000 when the tire rolls on the road in the “forward” mode of the vehicle. This guarantees better efficiency in maintaining the electronic member 10 within the retaining device 510.
[0045] [Fig. 4] shows a section of a pneumatic tire 100, which is also a pneumatic casing, according to the invention comprising a crown S extended by two sidewalls F and ending in two beads B. In this case, the tire 100 is intended to be mounted on a wheel which is not shown in this figure, at the level of the two beads B. A closed cavity is thus delimited, containing at least one fluid under pressure, delimited both by the second radially inner surface 130 of the pneumatic tire 100 and by the outer surface of the wheel. The pneumatic tire 100 also comprises a first surface 140 radially outer of the pneumatic tire 100.
[0046] The reference axis 201 will be noted corresponding to the reference axis or natural axis of rotation of the tire 100 and the median plane 211, perpendicular to the reference axis 201 and equidistant from the two beads B. The intersection of the reference axis 201 by the median plane 211 determines the center of the tire 100. A Cartesian reference will be defined at the center of the tire 100 consisting of the reference axis 201, a vertical axis 203 perpendicular to the ground and a longitudinal axis 202 perpendicular to the other two axes. And, we will define the axial plane 212 passing through the reference axis 201 and the longitudinal axis 202, parallel to the ground plane and perpendicular to the median plane 211. Finally, we will call vertical plane 213, the plane perpendicular to both the median plane 211 and the axial plane 212 passing through the vertical axis 203.
[0047] Any material point of the tire 100 is uniquely defined by its cylindrical coordinates (Y, R, 0). The scalar Y represents the axial distance to the center of the tire 100 in the direction of the reference axis 201 defined by the orthogonal projection of the material point of the tire 100 onto the axis of reference 201. A radial plane 214 will be defined making an angle 0 with respect to the vertical plane 213 around the reference axis 201. The material point of the tire 100 is identified in this radial plane 214 by the distance R from the center of the tire 100 in the direction perpendicular to the reference axis 201 identified by the orthogonal projection of this material point on the radial axis 204. The unit vector perpendicular to the radial plane 214 and forming a direct trihedron with the unit vectors of the axial 201 and radial 204 directions represents the circumferential direction of the tire 100. Note in [Fig.4] the presence of an arrow 300 carried by the longitudinal axis 202 indicating the direction of movement of the tire 100 when it is mounted on a vehicle and the vehicle is traveling in forward gear.
[0048] This pneumatic tire 100 has on the radially inner surface 130 a retaining device 510 which is fixed to the surface 130 by gluing according to the usual techniques of the state of the art when the retaining device 510 is made of elastomeric material. The retaining device 510 is fixed at the top S of the pneumatic casing 100, which improves its endurance since the retaining device 510 thus positioned provides less worry during the operations of mounting or dismounting the wheel on the pneumatic casing 100. Indeed, the retaining device 510 is located in an area remote from the beads B of the pneumatic casing 100. Here, the retaining device 510 is equipped with an electronic member 10 within its open volume which constitutes a housing adapted to receive the electronic member 10. As a result, the pneumatic casing 100 is here ready to be mounted on a wheel to constitute a mounted assembly.The electronic component 10 can deliver various functions such as the identification of certain components such as the electronic component itself, the tire. But the electronic component can also be equipped with a pressure and / or temperature sensor in order to evaluate the inflation pressure of the mounted assembly. Finally, it can also be equipped with a sensor directly measuring the curvature of the tire casing such as an accelerometer or a flexometer making it possible to trace back to tire usage graders such as the angular speed, the mileage traveled, the static load applied. All of these quantities make it possible to identify the performance of the tire casing such as, for example, its wear, its grip or intrinsic quantities of the ground on which the tire casing rolls.
[0049] In the specific case of [Fig. 4], the electronic components of the electronic member 10 are encapsulated in a protective housing. This protective housing has an annular groove which extends below the projecting element of the retaining device 510. Here, the projecting element is discontinuous, in the form of a single projecting pad representing an angular sector of 120 degrees around the axis of revolution. The angular orientation of the electronic system 1000 is intended on the one hand to position the stud so that it enters the contact plane first, that is to say that the barycenter of the points of the points of the projecting element in a radial plane is located behind the axis of revolution of the electronic member 10. On the other hand, the median plane of this stud is positioned according to the circumferential direction of the tire in order to optimize the occurrences of contact between the groove and the stud whether the vehicle turns right or left.
Claims
Claims
1. Electronic system (1000) comprising an electronic member (10) and a retaining device (510) for the electronic member (10) capable of being fixed to a wall of a pneumatic casing, said retaining device (510) comprising: - a sole (511) capable of being fixed to the wall of the pneumatic casing via an external surface, - a closed retaining wall (512), capable of retaining said electronic member (10), extending from the sole (511) to a free edge (513) and defining with said sole (511) an open volume (520), - said volume (520), capable of receiving at least a portion of said electronic member (10), being defined by an internal surface (514) of said sole (511) and by an internal surface (515) of said retaining wall (512), having an opening (516) delimited by the free edge (513) of said retaining wall (512),able to deform to introduce said electronic member (10) into said volume (520); said electronic member (10) comprising a protective housing (12) defining an outer surface (30) circumscribed in a cylinder (17) whose axis of revolution (15) is perpendicular to the median plane of the outer surface of the sole (511) of said retaining device (510) and delimited by two parallel planes (16, 16'); and characterized in that the retaining wall (512) comprises a projecting element (550) located radially outside the free edge (513) relative to the axis of revolution (15) and extending towards the volume (520) of the retaining device (510) over a thickness (e) in the direction of the axis of revolution (15) of the cylinder (17) circumscribed to the protective housing (12),in that the outer surface (30) of the protective housing (12) comprises a continuous and closed groove (51) located radially outside the projection (517) of the free edge (513) of the retaining wall (512) on the outer surface (30) in the direction of the axis of revolution (15) of the cylinder (17) circumscribed to the protective housing (12) and extending over an axial distance (e'), in that the groove (51) defines a second volume (52) capable of receiving the projecting element (550) and in that the projecting element (550) extends over a radial distance (rs) included in the radial extent (rR) of the groove (51) relative to the axis of revolution (15).,
2. An electronic system (1000) according to claim 1 wherein the projecting element (550) of the retaining wall (512) of the retaining device (510) is annular around the axis of revolution (15) and extends angularly over the entire projection (517) of the free edge (513) on the external surface (30).
3. Electronic system (1000) according to one of claims 1 to 2 wherein the section of the groove (51) of the protective housing (12) of the electronic member (10) is the counter-shape of the section of the projecting element (550) of the retaining device (510).
4. Electronic system (1000) according to one of claims 1 to 3 wherein the section of the projecting element (550) is included in the group comprising a semicircle, a semiellipse, a quadrilateral.
5. Electronic system (1000) according to one of claims 1 to 4 wherein the electronic member (10) comprising the following elements: - a radio transmitter / receiver coupled to at least one radio antenna; - a microprocessor located on a printed circuit, coupled to the radio transmitter / receiver and powered by an energy source, said elements are encapsulated in the protective housing (12).
6. Electronic system (1000) according to any one of claims 1 to 5 wherein the distance (e') of the groove (51) is greater than half the thickness (e) of the projecting element (550), preferably the distance (e') is greater than the thickness (e) of the projecting element (550).
7. Electronic system (1000) according to claim 6 in which the groove (51) extends in the direction of the axis of revolution (15) of the cylinder (17) circumscribed to the protective housing (12) over a distance (e') identical to the thickness (e) of the projecting element (550) in said direction.
8. Electronic system (1000) according to one of claims 2 to 7 wherein the projecting element (550) of the retaining wall (512) of the retaining device (510) is continuous and closed.
9. Arrangement of an electronic system (1000) according to one of claims 1 to 8 and of a pneumatic casing (100) being capable of rotating about an axis of rotation (201), said pneumatic casing (100) comprising a top (S), two flanks (F) extending from the top (S) and ending in two beads (B) capable of being connected to a wheel, in which the electronic system (1000) is fixed via the external surface of the sole (511) of the retaining device (510) on one of the surfaces (130, 140) of the pneumatic casing (100), preferably on the radially internal surface (130) of the pneumatic casing (100).
10. Arrangement according to claim 9 in which the electronic system (1000) is fixed on the radially inner surface (130) of the pneumatic casing (100) and the axial position of the electronic system is included in the axial extent of the top (S) of the pneumatic casing (100).
11. Arrangement according to claim 10 in which the pneumatic casing (100) being able to rotate around the axis of rotation (201) in a main direction corresponding to a direction of movement (300) relative to a ground of a vehicle equipped with said arrangement in forward gear, the barycenter of the points of the projecting element (550) of the retaining wall (512) of the retaining device (510 in an axial plane is positioned behind the axis of revolution (15) of the cylinder (17) circumscribed to the protective housing (12) of the electronic member (10) in the direction of movement (300) of the vehicle when the electronic system (1000) is located entirely in an angular sector of the pneumatic casing (100) in contact with the ground.
12. Arrangement according to claim 11 in which the median plane of the projecting element (550), delimiting the angular sector of the projecting element (550) into two equal angular sectors in the cylindrical reference frame associated with the cylinder (17) circumscribed to the protective housing (12) of the electronic member (10) has its normal having a main component along the axis of rotation (201) of the pneumatic casing (100), preferably its normal is collinear with the axis of rotation (201) of the pneumatic casing (100).