EP3394585A1 - Device for measuring a field of pressures exerted by a pneumatic tyre - Google Patents

Device for measuring a field of pressures exerted by a pneumatic tyre

Info

Publication number
EP3394585A1
EP3394585A1 EP16826124.6A EP16826124A EP3394585A1 EP 3394585 A1 EP3394585 A1 EP 3394585A1 EP 16826124 A EP16826124 A EP 16826124A EP 3394585 A1 EP3394585 A1 EP 3394585A1
Authority
EP
European Patent Office
Prior art keywords
protective sheet
sensor
measuring
less
measuring sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16826124.6A
Other languages
German (de)
French (fr)
Inventor
Thibaut ANSOUD
Florian BREMOND
José APARICIO
Rémi REYNAL DE ST-MICHEL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compagnie Generale des Etablissements Michelin SCA
Original Assignee
Compagnie Generale des Etablissements Michelin SCA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Compagnie Generale des Etablissements Michelin SCA filed Critical Compagnie Generale des Etablissements Michelin SCA
Publication of EP3394585A1 publication Critical patent/EP3394585A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G01M17/02—Tyres
    • G01M17/021—Tyre supporting devices, e.g. chucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/26—Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
    • G01L5/161—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in ohmic resistance
    • G01L5/162—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in ohmic resistance of piezoresistors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
    • G01L5/165—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in capacitance

Definitions

  • the invention lies in the field of measuring the field of pressure exerted on the ground by a tire.
  • the present invention more specifically relates to a device for measuring a pressure field exerted by a tire in the area of the measuring surface with which it is in contact.
  • the measuring devices known from the state of the art comprise a plane support on which there is a pressure field measurement sensor, also plane, preferably of the piezoresistive or piezo-capacitive sensor type.
  • a pressure field measurement sensor also plane, preferably of the piezoresistive or piezo-capacitive sensor type.
  • the tire to be tested is then mounted on a test bench and applied against this measurement sensor, with a certain force that simulates the force that tire exerts on the roadway or the ground during its use.
  • This force is exerted along an axis perpendicular to the contact surface of the tire with the ground.
  • These measuring devices are suitable when the tire is tested at a standstill or when driving in a straight line.
  • this protective sheet is simply fixed by two of its sides. As a result, it is not immobilized with respect to the sensor cells and may be degraded and creased when the tire applied to it is subjected to tensile and / or shear forces. This results in a poor transmission, to the cells of the sensor, of the measured pressure fields.
  • the protective sheet is glued directly to the cells of the sensor. In this case, it is impossible to test the tire under braking, drift or camber conditions, since this would result in the destruction of the sensor cells secured to the protective sheet and thus subjected to the same traction forces and / or or shear.
  • the invention therefore aims to solve the aforementioned drawbacks of the state of the art.
  • the invention relates to a device for measuring a pressure field exerted by a tire in the area of the measuring surface with which it is in contact, this device comprising a plane support and a sensor for measuring this pressure field. disposed on said support.
  • the object of the invention is to provide a measuring device as mentioned above, which is more resistant than the device known from the state of the art, which prevents the destruction of its measuring sensor and which does not significantly modify the resolution. of the sensor.
  • this device comprises at least one sheet, called “protective sheet”, disposed on said measuring sensor and against the upper face of which the tire to be tested is intended to be applied, this protective sheet is a thickness of less than 1 mm, preferably less than 0.2 mm and is made of a material resistant to forces, in particular shearing and traction, generated in its plane, greater than or equal to 1000 N and less than or equal to 10.000 N, this protective sheet is disposed on said measuring sensor so as to be at contact thereof and to be immobilized relative thereto, and the protective sheet is prestressed so as to be tensioned on said measuring sensor.
  • this protective sheet is a thickness of less than 1 mm, preferably less than 0.2 mm and is made of a material resistant to forces, in particular shearing and traction, generated in its plane, greater than or equal to 1000 N and less than or equal to 10.000 N
  • this protective sheet is disposed on said measuring sensor so as to be at contact thereof and to be immobilized relative thereto, and the protective sheet is prestressed so
  • this protective sheet makes it possible to protect the measurement sensor from the forces generated in the plane of friction, without significantly altering the resolution and the results of the measurements obtained by the sensor.
  • the invention thus goes against a prejudice that the fact of inserting a protective sheet between a sensor and a tire prevents the sensor from operating or greatly disrupts the results obtained.
  • said protective sheet is not secured to said measuring sensor
  • said protective sheet is made of a metallic material, preferably stainless steel or a composite material based on carbon fibers or based on aromatic polyamide fibers;
  • said protective sheet is covered with an electrically insulating sheet disposed between the sensor and said protective sheet and the sum of the thicknesses of the protective sheet and the electrically insulating sheet is less than 1 mm, preferably less than 0.2 mm;
  • said protective sheet is preloaded at values greater than 0 N and less than or equal to 500 N;
  • said protective sheet is prestressed by being wound at its two ends around a roller, at least one of these two rollers being a tensioning roller;
  • the measuring sensor is a piezoresistive or piezo-capacitive sensor
  • said measurement sensor has a resolution less than or equal to 5 mm 2 , preferably less than 2.5 mm 2 , more preferably less than or equal to 1 mm 2 ;
  • the device comprises a central unit of a computer and the measurement sensor comprises a connection device allowing the connecting a power supply cable and a connection cable to said central unit.
  • FIG. 1 is a schematic perspective view of the measuring device according to the invention and a tire being measured with this device, and
  • FIG. 2 is a schematic vertical cross sectional view of the measuring device according to the invention.
  • This measuring device 1 comprises a plane support 2 and a measurement sensor 3 disposed on this support 2.
  • the support 2 is generally a measurement table but could also be the floor.
  • the sensor 3 is preferably a piezoresistive or piezo-capacitive sensor.
  • the senor 3 has a measuring panel 30, a connector member 31, which allows to connect the power supply and connection cables between the measurement panel and a central unit 32 of a computer.
  • the measuring panel 30 preferably has a measurement surface greater than or equal to 5 cm by 5 cm.
  • the tire P to be tested is mounted on a hub M of a test bench B. More specifically, this hub M is rotatably mounted about an axis of rotation YY 'with respect to the test bench B, and the tire is mounted on the hub M so that the central axis of this tire is coincident with the axis of rotation YY 'of the hub.
  • the measuring device 1 has an axis longitudinal XX 'substantially perpendicular to the axis of rotation YY' of the hub and therefore of the tire.
  • the measurement plate 30 is covered with a protective sheet 4.
  • the measuring device 1 makes it possible to measure a field of the pressures exerted by a tire P in its area of contact with said protective sheet 4 covering the measurement sensor 3. It is considered that the results of these measurements correspond to the pressures exerted by the tire P when on the ground or the roadway.
  • the protective sheet 4 is chosen so as to have a resistance to forces (in particular shear and traction) generated in its plane and greater than or equal to 1000 N and less than or equal to 10.000 N.
  • the lower value makes it possible to guarantee that the protective sheet 4 will not be damaged during the tests currently carried out on the tires P.
  • the upper value corresponds to the upper limit imposed by the measuring sensor 3 and beyond which this sensor would be destroyed.
  • the forces are mainly shearing forces (arrows C), which are exerted in a direction parallel to the Y-Y 'axis to the left or to the right with respect to the tire P, forces of traction (arrows T), which are exerted in a direction perpendicular to the Y-Y axis "forwards or backwards and / or forces which correspond to the resultant of the aforesaid forces of shear and traction .
  • This protective sheet 4 is placed on the measurement sensor 3, (and more precisely on the measurement plate 30), so that its lower face 41 is in contact with this slab 30. In addition, the sheet 4 is immobilized by relative to this slab 30, so that it can not slip and deviate from it.
  • the tire P is intended to be applied against the upper face 42 of the sheet 4.
  • this protective sheet 4 is prestressed, that is to say that it is tensioned on said measuring sensor 3, so as not to present folds. This prestressing remains however lower than the limit of elastic rupture of the protective sheet 4.
  • this protective sheet 4 is not secured to the measuring sensor 3. It is for example not glued to it. Thus, when the tire exerts the aforementioned shearing and / or traction forces, it is this protective sheet 4 which supports said forces but which does not pass them on to the measuring sensor 3.
  • this protective sheet 4 is made of a material chosen from metals, preferably stainless steel, or from a composite material based on carbon fibers or aromatic polyamides.
  • the protective sheet 4 is made of an electrically insulating material. If this is not the case, this protective sheet 4 is then covered with an electrically insulating sheet interposed between the measurement plate 30 of the sensor and the protective sheet 4.
  • the measuring sensor 3 used preferably has a resolution of less than 5 mm 2 , more preferably less than 2.5 mm 2 or better still close to 1 mm 2 .
  • the protective sheet 4 should preferably have a thickness of less than 1 mm, more preferably less than 0.2 mm, so as to maintain the resolution of the sensor 3.
  • the skilled person is able to determine the minimum thickness of the protective sheet depending on the selected material, so that it withstands forces generated in its plane greater than or equal to 1000 N and less than or equal to 10.000 N. Preferably, this thickness is greater than 0.01 mm.
  • the protective sheet may be a metal strip of about 0.05 mm.
  • rollers 51, 52 may be coated with a layer of elastomer sufficiently thick to maximize the maintenance of the protective sheet 4 and annihilate the flatness defects surfaces (eg machining tolerance, bending of the rollers under stress, etc. .).
  • One of these rolls is for example fixed while the other may be a tensor roll.
  • the roller 52 can be fixed, the protective sheet 4 being clamped between the roller and the support 2, while the roller 51 can be wound on itself so as to stretch the protective sheet 4 (arrow F ).
  • the two rollers 51 and 52 may also be tensor rollers capable of being wound on themselves.
  • the two opposite rollers 51, 52 may also be movable laterally so as to be spaced apart to tension the protective sheet 4.
  • a tire P was mounted on the test stand and was applied against the protective sheet 4 and subjected to braking, drifting conditions at an angle of 15 ° and camber. This has generated forces in the plane of said protective sheet 4.
  • the angle of drift is an angle formed in the plane of the protective sheet 4 relative to the longitudinal axis XX 'of the device 1 to the right or left of the latter following the pivoting of the hub M carrying the tire P.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

The invention relates to a measuring device (1) for measuring a field of pressures exerted by a pneumatic tyre in the area of the measuring surface with which it is in contact, comprising a flat support (2) and a measuring sensor (3) for measuring said field of pressures, which is arranged on said support (2). Said device is characterised in that it comprises at least one film (4), a so-called "protection film" of a thickness of less than 1 mm, made of a material resistant to forces generated in the plane thereof, which are higher than or equal to 1000 N and lower than or equal to 10 000 N, said protection film (4) being arranged on said measuring sensor (3) so as to be contact therewith and immobilised in relation thereto, said protection film (4) being pre-stressed so as to be stretched over said meausring sensor (3).

Description

Dispositif de mesure d'un champ de pressions exercées par un pneumatique  Device for measuring a pressure field exerted by a tire
DOMAINE TECHNIQUE GENERAL GENERAL TECHNICAL FIELD
L'invention se situe dans le domaine de la mesure du champ de pressions exercées sur le sol par un pneumatique.  The invention lies in the field of measuring the field of pressure exerted on the ground by a tire.
Ces mesures de pression sont une grandeur clé pour comprendre les performances des pneumatiques, qu'ils soient destinés aux véhicules de tourisme, aux poids lourds, aux engins de génie civil ou aux deux roues, notamment en ce qui concerne leur usure, leur adhérence au sol ou leur résistance au roulement, par exemple.  These pressure measurements are a key variable to understand the performance of tires, whether for passenger cars, heavy goods vehicles, civil engineering machinery or two-wheelers, particularly as regards their wear, their adhesion to ground or their rolling resistance, for example.
La présente invention concerne plus précisément un dispositif de mesure d'un champ de pressions exercées par un pneumatique dans l'aire de la surface de mesure avec laquelle il est en contact.  The present invention more specifically relates to a device for measuring a pressure field exerted by a tire in the area of the measuring surface with which it is in contact.
ETAT DE L'ART STATE OF THE ART
Les dispositifs de mesure connus de l'état de la technique comprennent un support plan sur lequel on dispose un capteur de mesure du champ de pressions, également plan, de préférence du type capteur piézo- résistif ou piézo-capacitif. Le pneumatique à tester est ensuite monté sur un banc d'essai et appliqué contre ce capteur de mesure, avec une certaine force qui simule la force que ce pneu exerce sur la chaussée ou le sol pendant son utilisation.  The measuring devices known from the state of the art comprise a plane support on which there is a pressure field measurement sensor, also plane, preferably of the piezoresistive or piezo-capacitive sensor type. The tire to be tested is then mounted on a test bench and applied against this measurement sensor, with a certain force that simulates the force that tire exerts on the roadway or the ground during its use.
Cette force s'exerce selon un axe perpendiculaire à la surface de contact du pneumatique avec le sol.  This force is exerted along an axis perpendicular to the contact surface of the tire with the ground.
Ces dispositifs de mesure conviennent lorsque le pneumatique est testé à l'arrêt ou en roulage en ligne droite.  These measuring devices are suitable when the tire is tested at a standstill or when driving in a straight line.
Toutefois, lorsque l'on souhaite tester le pneumatique dans des conditions de freinage, de dérive (c'est-à-dire une situation de virage du véhicule), ou de carrossage, (c'est-à-dire en tenant compte du fait que le plan de roulement de la roue forme un angle avec la verticale), on constate que les forces générées dans le plan de contact (plan de frottement) du pneumatique avec le capteur sont très importantes.  However, when it is desired to test the tire under braking, drifting (that is to say a vehicle turning), or camber (ie taking into account the the fact that the running surface of the wheel forms an angle with the vertical), it is found that the forces generated in the contact plane (plane of friction) of the tire with the sensor are very important.
Ces forces sont principalement des forces de traction et/ou de cisaillement. Elles peuvent dépasser 1000 N. La demanderesse a pu observer que les forces précitées endommagent le capteur de façon irréversible. On connaît déjà d'après le document US 5 641 900, un dispositif d'analyse de la pression de contact d'un pneu au sol. Ce dispositif comprend un support plan, sur lequel plusieurs cellules de capteur sont installées. Ces cellules sont recouvertes d'une feuille de protection. These forces are mainly tensile and / or shear forces. They may exceed 1000 N. The Applicant has observed that the aforementioned forces damage the sensor irreversibly. It is already known from US 5,641,900, a device for analyzing the contact pressure of a tire on the ground. This device comprises a flat support, on which several sensor cells are installed. These cells are covered with a protective sheet.
Selon un premier mode de réalisation, cette feuille de protection est simplement fixée par deux de ses côtés. De ce fait, elle n'est pas immobilisée par rapport aux cellules du capteur et risque d'être dégradée et plissée lorsque le pneumatique appliqué dessus est soumis à des forces de traction et/ou de cisaillement. Il en résulte une mauvaise transmission, aux cellules du capteur, des champs de pression mesurés.  According to a first embodiment, this protective sheet is simply fixed by two of its sides. As a result, it is not immobilized with respect to the sensor cells and may be degraded and creased when the tire applied to it is subjected to tensile and / or shear forces. This results in a poor transmission, to the cells of the sensor, of the measured pressure fields.
Selon un deuxième mode de réalisation, la feuille de protection est collée directement aux cellules du capteur. Dans ce cas, le test du pneumatique dans des conditions de freinage, de dérive ou de carrossage est impossible, car cela aboutirait à la destruction des cellules du capteur solidarisées à la feuille de protection et soumises de ce fait aux mêmes forces de traction et/ou de cisaillement.  According to a second embodiment, the protective sheet is glued directly to the cells of the sensor. In this case, it is impossible to test the tire under braking, drift or camber conditions, since this would result in the destruction of the sensor cells secured to the protective sheet and thus subjected to the same traction forces and / or or shear.
PRESENTATION DE L'INVENTION PRESENTATION OF THE INVENTION
L'invention a donc pour but de résoudre les inconvénients précités de l'état de la technique.  The invention therefore aims to solve the aforementioned drawbacks of the state of the art.
L'invention concerne un dispositif de mesure d'un champ de pressions exercées par un pneumatique dans l'aire de la surface de mesure avec laquelle il est en contact, ce dispositif comprenant un support plan et un capteur de mesure de ce champ de pressions, disposé sur ledit support.  The invention relates to a device for measuring a pressure field exerted by a tire in the area of the measuring surface with which it is in contact, this device comprising a plane support and a sensor for measuring this pressure field. disposed on said support.
L'invention a pour objectif d'offrir un dispositif de mesure tel que précité, qui soit plus résistant que le dispositif connu de l'état de la technique, qui empêche la destruction de son capteur de mesure et qui ne modifie pas significativement la résolution du capteur.  The object of the invention is to provide a measuring device as mentioned above, which is more resistant than the device known from the state of the art, which prevents the destruction of its measuring sensor and which does not significantly modify the resolution. of the sensor.
Conformément à l'invention, ce dispositif comprend au moins une feuille, dite "feuille de protection", disposée sur ledit capteur de mesure et contre la face supérieure de laquelle le pneumatique à tester est destiné à être appliqué, cette feuille de protection est d'une épaisseur inférieure à 1 mm, de préférence inférieure à 0,2 mm et est réalisée dans un matériau résistant à des forces, notamment de cisaillement et de traction, générées dans son plan, supérieures ou égales à 1000 N et inférieures ou égales à 10.000 N, cette feuille de protection est disposée sur ledit capteur de mesure de façon à être au contact de celui-ci et à être immobilisée par rapport à celui-ci, et cette feuille de protection est précontrainte de façon à être tendue sur ledit capteur de mesure. According to the invention, this device comprises at least one sheet, called "protective sheet", disposed on said measuring sensor and against the upper face of which the tire to be tested is intended to be applied, this protective sheet is a thickness of less than 1 mm, preferably less than 0.2 mm and is made of a material resistant to forces, in particular shearing and traction, generated in its plane, greater than or equal to 1000 N and less than or equal to 10.000 N, this protective sheet is disposed on said measuring sensor so as to be at contact thereof and to be immobilized relative thereto, and the protective sheet is prestressed so as to be tensioned on said measuring sensor.
De façon inattendue pour l'homme du métier, il a été constaté que cette feuille de protection permettait de protéger le capteur de mesure des forces générées dans le plan de frottement, sans altérer significativement la résolution et les résultats des mesures obtenus par le capteur. L'invention va ainsi à encontre d'un préjugé qui veut que le fait d'intercaler une feuille de protection entre un capteur et un pneumatique empêche le capteur de fonctionner ou perturbe grandement les résultats obtenus.  Unexpectedly for the skilled person, it has been found that this protective sheet makes it possible to protect the measurement sensor from the forces generated in the plane of friction, without significantly altering the resolution and the results of the measurements obtained by the sensor. The invention thus goes against a prejudice that the fact of inserting a protective sheet between a sensor and a tire prevents the sensor from operating or greatly disrupts the results obtained.
Selon d'autres caractéristiques avantageuses et non limitatives de l'invention, prises seules ou en combinaison :  According to other advantageous and nonlimiting features of the invention, taken alone or in combination:
- ladite feuille de protection n'est pas solidarisée avec ledit capteur de mesure ;  said protective sheet is not secured to said measuring sensor;
- ladite feuille de protection est réalisée dans un matériau métallique, de préférence de l'acier inoxydable ou dans un matériau composite à base de fibres de carbone ou à base de fibres de polyamides aromatiques ;  said protective sheet is made of a metallic material, preferably stainless steel or a composite material based on carbon fibers or based on aromatic polyamide fibers;
- si la feuille de protection et la face supérieure du capteur de mesure sont électriquement conductrices, ladite feuille de protection est recouverte d'une feuille électriquement isolante disposée entre le capteur et ladite feuille de protection et la somme des épaisseurs de la feuille de protection et de la feuille électriquement isolante est inférieure à 1 mm, de préférence inférieure à 0,2 mm ;  if the protective sheet and the upper face of the measuring sensor are electrically conductive, said protective sheet is covered with an electrically insulating sheet disposed between the sensor and said protective sheet and the sum of the thicknesses of the protective sheet and the electrically insulating sheet is less than 1 mm, preferably less than 0.2 mm;
- ladite feuille de protection est précontrainte à des valeurs supérieures à 0 N et inférieures ou égales à 500 N ;  said protective sheet is preloaded at values greater than 0 N and less than or equal to 500 N;
- ladite feuille de protection est précontrainte en étant enroulée à ses deux extrémités autour d'un rouleau, l'un au moins de ces deux rouleaux étant un rouleau tenseur ;  said protective sheet is prestressed by being wound at its two ends around a roller, at least one of these two rollers being a tensioning roller;
- le capteur de mesure est un capteur piézo-résistif ou piézo- capacitif ;  the measuring sensor is a piezoresistive or piezo-capacitive sensor;
- ledit capteur de mesure présente une résolution inférieure ou égale à 5 mm2, de préférence inférieure à 2,5 mm2, de préférence encore inférieure ou égale à 1 mm2 ; said measurement sensor has a resolution less than or equal to 5 mm 2 , preferably less than 2.5 mm 2 , more preferably less than or equal to 1 mm 2 ;
- le dispositif comprend une unité centrale d'un ordinateur et le capteur de mesure comprend un organe de connectique permettant le branchement d'un câble d'alimentation électrique et d'un câble de connexion à ladite unité centrale. the device comprises a central unit of a computer and the measurement sensor comprises a connection device allowing the connecting a power supply cable and a connection cable to said central unit.
PRESENTATION DES FIGURES PRESENTATION OF FIGURES
D'autres caractéristiques et avantages de l'invention apparaîtront de la description qui va maintenant en être faite, en référence aux dessins annexés, qui en représentent, à titre indicatif mais non limitatif, un mode de réalisation possible.  Other features and advantages of the invention will appear from the description which will now be made, with reference to the accompanying drawings, which represent, by way of indication but not limitation, a possible embodiment.
Sur ces dessins :  On these drawings:
- La figure 1 est une vue schématique en perspective du dispositif de mesure conforme à l'invention et d'un pneumatique en cours de mesure avec ce dispositif, et  - Figure 1 is a schematic perspective view of the measuring device according to the invention and a tire being measured with this device, and
- la figure 2 est une vue schématique en coupe verticale transversale du dispositif de mesure conforme à l'invention.  - Figure 2 is a schematic vertical cross sectional view of the measuring device according to the invention.
DESCRIPTION DETAILLEE DETAILED DESCRIPTION
La structure générale du dispositif de mesure d'un champ de pressions exercées par un pneumatique dans son aire de contact avec le sol va maintenant être décrite en faisant référence à la figure 1.  The general structure of the device for measuring a pressure field exerted by a tire in its area of contact with the ground will now be described with reference to FIG.
Ce dispositif de mesure 1 comprend un support plan 2 et un capteur de mesure 3, disposé sur ce support 2.  This measuring device 1 comprises a plane support 2 and a measurement sensor 3 disposed on this support 2.
Le support 2 est généralement une table de mesure mais pourrait également être le sol.  The support 2 is generally a measurement table but could also be the floor.
Le capteur 3 est de préférence un capteur piézo- résistif ou piézo- capacitif.  The sensor 3 is preferably a piezoresistive or piezo-capacitive sensor.
Plus précisément, le capteur 3 présente une dalle de mesure 30, un organe de connectique 31 , qui permet d'y brancher les câbles d'alimentation électrique et de connexion entre la dalle de mesure et une unité centrale 32 d'un ordinateur.  More specifically, the sensor 3 has a measuring panel 30, a connector member 31, which allows to connect the power supply and connection cables between the measurement panel and a central unit 32 of a computer.
Pour donner un ordre d'idées, la dalle de mesure 30 offre de préférence une surface de mesure supérieure ou égale à 5 cm sur 5 cm.  To give an order of ideas, the measuring panel 30 preferably has a measurement surface greater than or equal to 5 cm by 5 cm.
Le pneumatique P à tester est monté sur un moyeu M d'un banc d'essai B. Plus précisément, ce moyeu M est monté tournant autour d'un axe de rotation Y-Y' par rapport au banc d'essai B, et le pneumatique est monté sur le moyeu M de façon que l'axe central de ce pneumatique soit confondu avec l'axe de rotation Y-Y' du moyeu. Le dispositif de mesure 1 présente un axe longitudinal X-X' sensiblement perpendiculaire à l'axe de rotation Y-Y' du moyeu et donc du pneumatique. The tire P to be tested is mounted on a hub M of a test bench B. More specifically, this hub M is rotatably mounted about an axis of rotation YY 'with respect to the test bench B, and the tire is mounted on the hub M so that the central axis of this tire is coincident with the axis of rotation YY 'of the hub. The measuring device 1 has an axis longitudinal XX 'substantially perpendicular to the axis of rotation YY' of the hub and therefore of the tire.
Conformément à l'invention, et comme on peut le voir également sur la figure 2, la dalle de mesure 30 est recouverte d'une feuille de protection 4.  According to the invention, and as can also be seen in FIG. 2, the measurement plate 30 is covered with a protective sheet 4.
Le dispositif de mesure 1 conforme à l'invention permet de mesurer un champ des pressions exercées par un pneumatique P dans son aire de contact avec ladite feuille de protection 4 recouvrant le capteur de mesure 3. On considère que les résultats de ces mesures correspondent aux pressions exercées par le pneumatique P lorsqu'il se trouve sur le sol ou la chaussée.  The measuring device 1 according to the invention makes it possible to measure a field of the pressures exerted by a tire P in its area of contact with said protective sheet 4 covering the measurement sensor 3. It is considered that the results of these measurements correspond to the pressures exerted by the tire P when on the ground or the roadway.
La feuille de protection 4 est choisie de façon à présenter une résistance à des forces (notamment de cisaillement et de traction) générées dans son plan et supérieures ou égales à 1000 N et inférieures ou égales à 10.000 N. La valeur inférieure permet de garantir que la feuille de protection 4 ne sera pas endommagée lors des tests couramment effectués sur les pneumatiques P. La valeur supérieure correspond à la limite supérieure imposée par le capteur de mesure 3 et au-delà de laquelle ce capteur serait détruit.  The protective sheet 4 is chosen so as to have a resistance to forces (in particular shear and traction) generated in its plane and greater than or equal to 1000 N and less than or equal to 10.000 N. The lower value makes it possible to guarantee that the protective sheet 4 will not be damaged during the tests currently carried out on the tires P. The upper value corresponds to the upper limit imposed by the measuring sensor 3 and beyond which this sensor would be destroyed.
Comme exposé ci-dessus, les forces sont principalement des forces de cisaillement (flèches C), qui s'exercent selon une direction parallèle à l'axe Y- Y' vers la gauche ou vers la droite par rapport au pneumatique P, des forces de traction (flèches T), qui s'exercent selon une direction perpendiculaire à l'axe Y- Y" vers l'avant ou vers l'arrière et/ou des forces qui correspondent à la résultante des forces précitées de cisaillement et de traction.  As explained above, the forces are mainly shearing forces (arrows C), which are exerted in a direction parallel to the Y-Y 'axis to the left or to the right with respect to the tire P, forces of traction (arrows T), which are exerted in a direction perpendicular to the Y-Y axis "forwards or backwards and / or forces which correspond to the resultant of the aforesaid forces of shear and traction .
Cette feuille de protection 4 est disposée sur le capteur de mesure 3, (et plus précisément sur la dalle de mesure 30), de façon que sa face inférieure 41 soit au contact de cette dalle 30. En outre, la feuille 4 est immobilisée par rapport à cette dalle 30, de sorte qu'elle ne peut pas glisser et s'écarter de celle-ci.  This protective sheet 4 is placed on the measurement sensor 3, (and more precisely on the measurement plate 30), so that its lower face 41 is in contact with this slab 30. In addition, the sheet 4 is immobilized by relative to this slab 30, so that it can not slip and deviate from it.
Le pneumatique P est destiné à être appliqué contre la face supérieure 42 de la feuille 4.  The tire P is intended to be applied against the upper face 42 of the sheet 4.
En outre, de préférence, cette feuille de protection 4 est précontrainte, c'est-à-dire qu'elle est tendue sur ledit capteur de mesure 3, de façon à ne pas présenter de plis. Cette précontrainte reste toutefois inférieure à la limite de rupture élastique de la feuille de protection 4.  In addition, preferably, this protective sheet 4 is prestressed, that is to say that it is tensioned on said measuring sensor 3, so as not to present folds. This prestressing remains however lower than the limit of elastic rupture of the protective sheet 4.
De préférence toutefois, cette feuille de protection 4 n'est pas solidarisée au capteur de mesure 3. Elle n'est par exemple pas collée à celui-ci. Ainsi, lorsque le pneumatique exerce des forces de cisaillement et/ou de traction précitées, c'est cette feuille de protection 4 qui supporte lesdites forces mais qui ne les répercute pas au capteur de mesure 3. Preferably, however, this protective sheet 4 is not secured to the measuring sensor 3. It is for example not glued to it. Thus, when the tire exerts the aforementioned shearing and / or traction forces, it is this protective sheet 4 which supports said forces but which does not pass them on to the measuring sensor 3.
Des essais effectués par la demanderesse ont permis de déterminer les paramètres préférentiels de la feuille de protection 4.  Tests carried out by the applicant have made it possible to determine the preferred parameters of the protective sheet 4.
De préférence, cette feuille de protection 4 est réalisée dans un matériau choisi parmi les métaux, de préférence l'acier inoxydable, ou dans un matériau composite à base de fibres de carbone ou de polyamides aromatiques.  Preferably, this protective sheet 4 is made of a material chosen from metals, preferably stainless steel, or from a composite material based on carbon fibers or aromatic polyamides.
En fonction du type de capteur 3 employé, et notamment si la dalle de mesure 30 de celui-ci est électriquement conductrice, il est alors nécessaire que la feuille de protection 4 soit réalisée dans un matériau électriquement isolant. Si tel n'est pas le cas, cette feuille de protection 4 est alors recouverte d'une feuille électriquement isolante, intercalée entre la dalle de mesure 30 du capteur et la feuille de protection 4.  Depending on the type of sensor 3 used, and especially if the measuring plate 30 thereof is electrically conductive, it is then necessary that the protective sheet 4 is made of an electrically insulating material. If this is not the case, this protective sheet 4 is then covered with an electrically insulating sheet interposed between the measurement plate 30 of the sensor and the protective sheet 4.
Le capteur de mesure 3 utilisé présente de préférence une résolution inférieure à 5 mm2, de préférence encore inférieure à 2,5 mm2 ou mieux encore voisine de 1 mm2. The measuring sensor 3 used preferably has a resolution of less than 5 mm 2 , more preferably less than 2.5 mm 2 or better still close to 1 mm 2 .
Les essais effectués par la demanderesse ont montré que la feuille de protection 4 devait de préférence présenter une épaisseur inférieure à 1 mm, de préférence encore inférieure à 0,2 mm, de façon à conserver la résolution du capteur 3. L'homme du métier est à même de déterminer l'épaisseur minimale de la feuille de protection en fonction du matériau choisi, pour qu'elle résiste à des forces générées dans son plan supérieures ou égales à 1000 N et inférieures ou égales à 10.000 N. De préférence, cette épaisseur est supérieure à 0,01 mm.  The tests carried out by the applicant have shown that the protective sheet 4 should preferably have a thickness of less than 1 mm, more preferably less than 0.2 mm, so as to maintain the resolution of the sensor 3. The skilled person is able to determine the minimum thickness of the protective sheet depending on the selected material, so that it withstands forces generated in its plane greater than or equal to 1000 N and less than or equal to 10.000 N. Preferably, this thickness is greater than 0.01 mm.
A titre d'exemple purement illustratif, la feuille de protection peut être un feuillard métallique d'environ 0,05 mm.  As a purely illustrative example, the protective sheet may be a metal strip of about 0.05 mm.
Afin de s'assurer que la feuille de protection 4 est bien immobilisée par rapport au capteur 3 et précontrainte, il est possible comme représenté sur un exemple de réalisation de la figure 2, d'enrouler les deux extrémités de la feuille de protection 4 autour de deux rouleaux, référencés respectivement 51 et 52.  In order to ensure that the protective sheet 4 is immobilized with respect to the sensor 3 and preloaded, it is possible, as represented in an embodiment of FIG. 2, to wind the two ends of the protective sheet 4 around each other. two rolls, respectively referenced 51 and 52.
Ces rouleaux 51 , 52 peuvent être revêtus d'une couche d'élastomère suffisamment épaisse pour maximiser le maintien de la feuille de protection 4 et annihiler les défauts de planéité des surfaces (par exemple tolérance d'usinage, cintrage des rouleaux sous effort, etc.). L'un de ces rouleaux est par exemple fixe tandis que l'autre peut être un rouleau tenseur. Ainsi par exemple, le rouleau 52 peut être fixe, la feuille de protection 4 étant pincée entre ce rouleau et le support 2, tandis que le rouleau 51 peut être enroulé sur lui-même de façon à tendre la feuille de protection 4 (flèche F). Les deux rouleaux 51 et 52 peuvent également être des rouleaux tenseurs aptes à être enroulés sur eux-mêmes. These rollers 51, 52 may be coated with a layer of elastomer sufficiently thick to maximize the maintenance of the protective sheet 4 and annihilate the flatness defects surfaces (eg machining tolerance, bending of the rollers under stress, etc. .). One of these rolls is for example fixed while the other may be a tensor roll. For example, the roller 52 can be fixed, the protective sheet 4 being clamped between the roller and the support 2, while the roller 51 can be wound on itself so as to stretch the protective sheet 4 (arrow F ). The two rollers 51 and 52 may also be tensor rollers capable of being wound on themselves.
Les deux rouleaux opposés 51 , 52 peuvent aussi être mobiles latéralement de façon à pouvoir être écartés pour tendre la feuille de protection 4.  The two opposite rollers 51, 52 may also be movable laterally so as to be spaced apart to tension the protective sheet 4.
Des essais ont été effectués avec le dispositif de mesure 1 équipé de la feuille de protection 4 précitée.  Tests were carried out with the measuring device 1 equipped with the aforementioned protective sheet 4.
Un pneumatique P a été monté sur le banc d'essai et il a été appliqué contre la feuille de protection 4 et soumis à des conditions de freinage, de dérive jusqu'à un angle de 15° et de carrossage. Ceci a généré des forces dans le plan de ladite feuille de protection 4. Pour mémoire, on rappelle que l'angle de dérive est un angle formé dans le plan de la feuille de protection 4 par rapport à l'axe longitudinal X-X' du dispositif de mesure 1 à droite ou à gauche de celui-ci suivant le pivotement du moyeu M transportant le pneumatique P.  A tire P was mounted on the test stand and was applied against the protective sheet 4 and subjected to braking, drifting conditions at an angle of 15 ° and camber. This has generated forces in the plane of said protective sheet 4. For the record, it is recalled that the angle of drift is an angle formed in the plane of the protective sheet 4 relative to the longitudinal axis XX 'of the device 1 to the right or left of the latter following the pivoting of the hub M carrying the tire P.
Il a été observé que ni cette feuille de protection 4, ni le capteur 3 n'étaient dégradés lorsqu'ils étaient soumis à des forces générées dans le plan de ladite feuille de protection supérieures ou égales à 1000 N et allant jusqu'à 10 000 N.  It has been observed that neither this protective sheet 4 nor the sensor 3 were degraded when they were subjected to forces generated in the plane of said protective sheet greater than or equal to 1000 N and up to 10,000. NOT.
En outre les résultats des mesures de champs de pressions obtenus sont reproductibles, exploitables et respectent la résolution du capteur 3, ce qui signifie que la feuille 4 ne vient pas perturber significativement les résultats de mesure obtenus à l'aide de ce capteur.  In addition, the results of the pressure field measurements obtained are reproducible, exploitable and respect the resolution of the sensor 3, which means that the sheet 4 does not significantly disturb the measurement results obtained with this sensor.

Claims

REVENDICATIONS
1 . Dispositif de mesure (1 ) d'un champ de pressions exercées par un pneumatique dans l'aire de la surface de mesure avec laquelle il est en contact, ce dispositif (1 ) comprenant un support plan (2) et un capteur de mesure (3) de ce champ de pressions, disposé sur ledit support (2), caractérisé en ce qu'il comprend au moins une feuille (4), dite "feuille de protection", disposée sur ledit capteur de mesure (3) et contre la face supérieure (42) de laquelle le pneumatique à tester est destiné à être appliqué, en ce que cette feuille de protection (4) est d'une épaisseur inférieure à 1 mm et est réalisée dans un matériau résistant à des forces, notamment de cisaillement et de traction, générées dans son plan, supérieures ou égales à 1000 N et inférieures ou égales à 10.000 N, en ce que cette feuille de protection (4) est disposée sur ledit capteur de mesure (3) de façon à être au contact de celui-ci et à être immobilisée par rapport à celui-ci, et en ce que cette feuille de protection (4) est précontrainte de façon à être tendue sur ledit capteur de mesure (3). 1. Device (1) for measuring a pressure field exerted by a tire in the area of the measuring surface with which it is in contact, this device (1) comprising a plane support (2) and a measurement sensor ( 3) of this pressure field, disposed on said support (2), characterized in that it comprises at least one sheet (4), called "protective sheet", disposed on said measuring sensor (3) and against upper face (42) of which the tire to be tested is intended to be applied, in that this protective sheet (4) is of a thickness of less than 1 mm and is made of a material resistant to forces, in particular shear forces and traction, generated in its plane, greater than or equal to 1000 N and less than or equal to 10.000 N, in that this protective sheet (4) is disposed on said measuring sensor (3) so as to be in contact with this one and to be immobilized with respect to it, and in that ue this protective sheet (4) is preloaded so as to be tensioned on said measuring sensor (3).
2. Dispositif selon la revendication 1 , caractérisé en ce que ladite feuille de protection (4) n'est pas solidarisée avec ledit capteur de mesure (3).  2. Device according to claim 1, characterized in that said protective sheet (4) is not secured to said measuring sensor (3).
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que ladite feuille de protection (4) est réalisée dans un matériau métallique, de préférence de l'acier inoxydable.  3. Device according to claim 1 or 2, characterized in that said protective sheet (4) is made of a metallic material, preferably stainless steel.
4. Dispositif selon la revendication 1 ou 2, caractérisé en ce que ladite feuille de protection (4) est réalisée dans un matériau composite à base de fibres de carbone ou à base de fibres de polyamides aromatiques.  4. Device according to claim 1 or 2, characterized in that said protective sheet (4) is made of a composite material based on carbon fibers or based on aromatic polyamide fibers.
5. Dispositif selon l'une des revendications précédentes, caractérisé en ce que si la feuille de protection (4) et la face supérieure du capteur de mesure (3) sont électriquement conductrices, ladite feuille de protection (4) est recouverte d'une feuille électriquement isolante disposée entre le capteur (3) et ladite feuille de protection (4) et en ce que la somme des épaisseurs de la feuille de protection (4) et de la feuille électriquement isolante est inférieure à 1 mm.  5. Device according to one of the preceding claims, characterized in that if the protective sheet (4) and the upper face of the measuring sensor (3) are electrically conductive, said protective sheet (4) is covered with a electrically insulating sheet disposed between the sensor (3) and said protective sheet (4) and in that the sum of the thicknesses of the protective sheet (4) and the electrically insulating sheet is less than 1 mm.
6. Dispositif selon la revendication 1 ou 5, caractérisé en ce que l'épaisseur de ladite feuille de protection (4) ou la somme des épaisseurs de la feuille de protection (4) et de la feuille électriquement isolante est inférieure à 0,2 mm. 6. Device according to claim 1 or 5, characterized in that the thickness of said protective sheet (4) or the sum of the thicknesses of the protective sheet (4) and the electrically insulating sheet is less than 0.2. mm.
7. Dispositif selon l'une des revendications précédentes, caractérisé en ce que ladite feuille de protection (4) est précontrainte à des valeurs supérieures à 0 N et inférieures ou égales à 500 N. 7. Device according to one of the preceding claims, characterized in that said protective sheet (4) is preloaded to values greater than 0 N and less than or equal to 500 N.
8. Dispositif selon l'une des revendications précédentes, caractérisé en ce que ladite feuille de protection (4) est précontrainte en étant enroulée à ses deux extrémités autour d'un rouleau (51 , 52), l'un au moins de ces deux rouleaux étant un rouleau tenseur.  8. Device according to one of the preceding claims, characterized in that said protective sheet (4) is prestressed by being wound at its two ends around a roller (51, 52), at least one of these two rollers being a tensor roll.
9. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le capteur de mesure (3) est un capteur piézo- résistif ou piézo-capacitif.  9. Device according to one of the preceding claims, characterized in that the measuring sensor (3) is a piezoresistive or piezo-capacitive sensor.
10. Dispositif selon l'une des revendications précédentes, caractérisé en ce que ledit capteur de mesure (3) présente une résolution inférieure ou égale à 5 mm2. 10. Device according to one of the preceding claims, characterized in that said measuring sensor (3) has a resolution less than or equal to 5 mm 2 .
1 1. Dispositif selon la revendication 10, caractérisé en ce que ledit capteur de mesure (3) présente une résolution inférieure à 2,5 mm2, de préférence inférieure ou égale à 1 mm2. 1 1. Device according to claim 10, characterized in that said measuring sensor (3) has a resolution less than 2.5 mm 2 , preferably less than or equal to 1 mm 2 .
12. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il comprend une unité centrale (32) d'un ordinateur et en ce que ledit capteur de mesure (3) comprend un organe de connectique permettant le branchement d'un câble d'alimentation électrique et d'un câble de connexion à ladite unité centrale.  12. Device according to one of the preceding claims, characterized in that it comprises a central unit (32) of a computer and in that said measuring sensor (3) comprises a connector member for connecting a power supply cable and a connection cable to said central unit.
EP16826124.6A 2015-12-22 2016-12-20 Device for measuring a field of pressures exerted by a pneumatic tyre Withdrawn EP3394585A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1563130A FR3045823B1 (en) 2015-12-22 2015-12-22 DEVICE FOR MEASURING A FIELD OF PRESSURES EXERCISED BY A TIRE
PCT/FR2016/053567 WO2017109377A1 (en) 2015-12-22 2016-12-20 Device for measuring a field of pressures exerted by a pneumatic tyre

Publications (1)

Publication Number Publication Date
EP3394585A1 true EP3394585A1 (en) 2018-10-31

Family

ID=55346109

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16826124.6A Withdrawn EP3394585A1 (en) 2015-12-22 2016-12-20 Device for measuring a field of pressures exerted by a pneumatic tyre

Country Status (6)

Country Link
US (1) US20180372589A1 (en)
EP (1) EP3394585A1 (en)
JP (1) JP2018538546A (en)
CN (1) CN108700481A (en)
FR (1) FR3045823B1 (en)
WO (1) WO2017109377A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3132465B1 (en) 2022-02-04 2024-01-19 Michelin & Cie Competition tire with rapid temperature rise

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1849730A (en) * 1927-05-04 1932-03-15 Lulan S Morse Tire pressure indicator
IT1270194B (en) * 1994-06-09 1997-04-29 Pirelli DEVICE TO DETECT THE DISTRIBUTION OF THE SPECIFIC PRESSURE IN THE FOOTPRINT OF A TIRE FOR VEHICLES AND METHOD OF DETECTION FROM IT IMPLEMENTED
CN1245615C (en) * 2001-08-06 2006-03-15 米其林技术公司 Method for determining components of forces exerted on tyre and the self-aligment torque
US6823728B1 (en) * 2002-03-12 2004-11-30 Elwood E. Barnes Systems and methods for measurement of tire pressure
CN2614961Y (en) * 2003-03-14 2004-05-12 朱剑波 Vehicle tyre pressure alarm
JP4816095B2 (en) * 2006-01-20 2011-11-16 日産自動車株式会社 Tire pressure sensor mounting structure and tire wheel
FR2950691B1 (en) * 2009-09-30 2012-05-04 Michelin Soc Tech SEALED PRESSURE MEASURING MEMBER
CN102815174A (en) * 2011-06-07 2012-12-12 无锡华润安盛科技有限公司 Pressure sensor, automobile tyre pressure monitoring system, and pressure sensor manufacturing method

Also Published As

Publication number Publication date
CN108700481A (en) 2018-10-23
JP2018538546A (en) 2018-12-27
WO2017109377A1 (en) 2017-06-29
FR3045823A1 (en) 2017-06-23
FR3045823B1 (en) 2017-12-08
US20180372589A1 (en) 2018-12-27

Similar Documents

Publication Publication Date Title
EP3197690B1 (en) Adapter for a wheel assembly and a wheel assembly comprising same
EP0893680A1 (en) Apparatus for monitoring the load on a tyre
EP1076235B1 (en) Measuring adhesive friction between roadway and vehicle tyres
WO2010130795A1 (en) Skid plates for a motorcycle
EP1982850A1 (en) Device and method for monitoring the pressure of a vehicle tire using an inclinometer
EP3394585A1 (en) Device for measuring a field of pressures exerted by a pneumatic tyre
JP5083512B2 (en) Method and apparatus for measuring tire electrical resistance
EP3775583A1 (en) Attachment system for box for measuring characteristics of a tyre
EP0668997B1 (en) Device for implementing methods for measuring rolling resistances and grip limits, and methods implemented
FR3001541A1 (en) METHOD FOR CHARACTERIZING THE BEHAVIOR OF A VEHICLE AND APPLICATION FOR CHOOSING THE TIRES OF THE VEHICLE
WO2006106239A1 (en) Device and method for measuring the width of touch between rollers
WO2012120221A1 (en) Method and device for tightening a screwed assembly
CA2181765A1 (en) Continuous between-cylinders metal band casting machine side face supporting device
FR3070088A1 (en) FLOOR MOUNTING SYSTEM FOR DETECTION HOUSING
WO2002098683A1 (en) Method and device for mounting a tyre and method for analysing said tyre
CA2389297A1 (en) Method for enhancing dry ground adherence of a tyre
EP2876424A2 (en) Thermal test bench of a pantograph wearing strip and corresponding thermal testing method
EP3891462A1 (en) Fixing system for housing for measuring characteristics of a tyre
EP1335804B1 (en) Method for adjusting a flattener under traction and corresponding device
FR2914062A1 (en) Screw's tension effort measuring method for wheel assembly, involves determining elongation of rod by using strain gauges, and deducing tension effort of screw is deduced from rod elongation corresponding to elongation of screw
FR2471868A1 (en) PERFECTED RIM FOR A PNEUMATIC VEHICLE WHEEL
FR2891907A1 (en) FREINOMETER ROLL
FR2630824A1 (en) DEVICE FOR CHECKING THE TIRES OF MOTOR VEHICLES
FR3102096A1 (en) TOP REINFORCEMENT FOR METROPOLITAN TYPE TIRE
FR3085480A1 (en) SENSOR FOR CONTROLLING THE QUALITY OF CURRENT CAPTURE BY A PANTOGRAPH OF A RAIL TRACTION MACHINE

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20180604

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
RIC1 Information provided on ipc code assigned before grant

Ipc: G01L 1/26 20060101ALI20190329BHEP

Ipc: G01M 17/02 20060101ALI20190329BHEP

Ipc: G01L 5/16 20060101AFI20190329BHEP

GRAJ Information related to disapproval of communication of intention to grant by the applicant or resumption of examination proceedings by the epo deleted

Free format text: ORIGINAL CODE: EPIDOSDIGR1

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20190621

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20191105