FR2966243A1 - Method for measuring degradation level of test bearing of front windscreen wiper mechanism of motor vehicle, involves determining consequence of degradation of circumference of bore by calculating ratio between values of sensor resistances - Google Patents

Method for measuring degradation level of test bearing of front windscreen wiper mechanism of motor vehicle, involves determining consequence of degradation of circumference of bore by calculating ratio between values of sensor resistances Download PDF

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Publication number
FR2966243A1
FR2966243A1 FR1058361A FR1058361A FR2966243A1 FR 2966243 A1 FR2966243 A1 FR 2966243A1 FR 1058361 A FR1058361 A FR 1058361A FR 1058361 A FR1058361 A FR 1058361A FR 2966243 A1 FR2966243 A1 FR 2966243A1
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France
Prior art keywords
bearing
sensors
bore
degradation
measuring
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FR1058361A
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French (fr)
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FR2966243B1 (en
Inventor
Frederic Guidez
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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Priority to FR1058361A priority Critical patent/FR2966243B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G01M13/04—Bearings
    • 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
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01L1/2231—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being disc- or ring-shaped, adapted for measuring a force along a single direction
    • G01L1/2237—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being disc- or ring-shaped, adapted for measuring a force along a single direction the direction being perpendicular to the central axis
    • 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
    • G01L5/0009—Force sensors associated with a bearing

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

The method involves fixing electric resistance sensors (3) on a surface (1) of a bearing (2), where the sensors are arranged in a circular and star manner and exposed to a bore (4) of the bearing. A set of values of new electric resistances of each sensor is measured. Another set of values of electric resistances of each sensor after completion of an endurance test, is measured. Consequence of degradation of a circumference of the bore is determined by calculating a ratio between the two sets of values of electric resistances of the sensors. An independent claim is also included for a test bearing comprising electric resistance sensors.

Description

METHODE POUR MESURER LA DEGRADATION D'UN PALIER DE MECANISME D'ESSUIE-VITRE AVANT D'UN VEHICULE AUTOMOBILE La présente invention concerne une méthode pour mesurer la dégradation d'un palier de mécanisme d'essuie-vitre avant d'un véhicule automobile. The present invention relates to a method for measuring the degradation of a windshield wiper mechanism bearing before a motor vehicle. BACKGROUND OF THE INVENTION

Un mécanisme d'essuie-vitre avant d'un véhicule automobile comprend régulièrement un moteur qui entraîne par l'intermédiaire d'une manivelle moteur et des bielles des axes de sortie sur lesquels sont montés des entraîneurs du bras-balai des essuie-vitres. Un tel mécanisme d'essuie-vitre est connu, par exemple de la demande de brevet européen EP 2 143 601 Al. A windscreen wiper mechanism of a motor vehicle regularly comprises a motor which drives via a crank motor and rods of the output shafts on which are mounted the arms of the wiper arm of the windscreen wipers. Such a windscreen wiper mechanism is known, for example from the European patent application EP 2 143 601 A1.

Les paliers sont des alésages qui maintiennent les axes de sortie en position et en orientation. Au fur et à mesure du fonctionnement du mécanisme, les axes de sortie qui pivotent dans les paliers, érodent l'intérieur des paliers. La conséquence de ce phénomène d'usure est que les paliers s'élargissent et les axes prennent du jeu en orientation entraînant un surcroît de course du balai essuie-vitre. Ce surcroît de course se traduit par le risque que les balais viennent cogner sur les parties environnantes telles que les montant de baies, la grille d'auvent ce qui obligerait à prévoir un angle de balayage nominal plus faible qui réduirait la visibilité latérale pour le conducteur. The bearings are bores that hold the output shafts in position and orientation. As the mechanism operates, the output pins that pivot in the bearings erode the inside of the bearings. The consequence of this phenomenon of wear is that the bearings widen and the axes take up the game in orientation causing an additional stroke of the wiper blade. This extra stroke translates into the risk of the brooms bumping into surrounding areas such as bays, the awning grid, which would require a lower nominal sweep angle that would reduce lateral visibility for the driver. .

Pour des paliers métalliques, par exemple en aluminium, on observe l'apparition d'un jeu angulaire de 0,5° entre l'état neuf du palier et après vieillissement, soit environ 5mm de surcroît de course à considérer en fin de course de balayage. For metallic bearings, for example aluminum, there is the appearance of an angular clearance of 0.5 ° between the new condition of the bearing and after aging, or about 5mm more race to consider at the end of the race. scanning.

Pour des paliers en plastique qui sont moins onéreux mais plus fragiles que les paliers métalliques, on observe l'apparition d'un jeu angulaire de 1,5° entre l'état neuf du palier et après vieillissement, soit environ 15 mm de surcroît de course à considérer en fin de course de balayage. For plastic bearings which are less expensive but more fragile than metal bearings, there is the appearance of an angular clearance of 1.5 ° between the new state of the bearing and after aging, or about 15 mm more of race to consider at the end of the sweep stroke.

Avant de mener des actions correctives pour limiter la dégradation de la prise de jeu des paliers, on doit analyser la mesure et la forme du jeu du palier. C'est le but de la présente invention de proposer une méthode pour mesurer la dégradation d'un palier de mécanisme d'essuie-vitre avant qui permette d'analyser l'usure concrètement pour arriver à prévoir des mesures pour rigidifier les paliers. 15 La présente invention a pour objet une méthode pour mesurer la dégradation d'un palier de mécanisme d'essuie-vitre avant d'un véhicule automobile dans laquelle on fixe sur une surface du palier des capteurs, type résistance électrique, disposés en étoile de manière circulaire et 20 affleurant à l'alésage du palier, on mesure la valeur des résistances neuves Rn de chacun des capteurs, on mesure la valeur des résistances Rv de chacun des capteurs après avoir effectué un essai d'endurance, on détermine l'importance de la dégradation du pourtour de l'alésage par le calcul du rapport Rv/Rn pour chacune des résistances des capteurs. 25 De préférence, les capteurs sont collés sur la surface du palier. Before taking corrective action to limit the degradation of the bearing clearance, the measurement and shape of the bearing clearance must be analyzed. It is the object of the present invention to provide a method for measuring the degradation of a windshield wiper mechanism bearing before which makes it possible to analyze the wear concretely to arrive at providing measures to stiffen the bearings. The present invention relates to a method for measuring the degradation of a wiper mechanism bearing front of a motor vehicle in which is fixed on a bearing surface of the sensors, type electrical resistance, arranged in a star of circular manner and flush with the bore of the bearing, the value of the new resistances Rn of each of the sensors is measured, the value of the resistances Rv of each of the sensors is measured after having carried out an endurance test, the importance is determined. degradation of the perimeter of the bore by calculating the ratio Rv / Rn for each of the resistors of the sensors. Preferably, the sensors are glued to the bearing surface.

Avantageusement, six capteurs sont répartis de manière régulière et circulaire autour de l'alésage du palier. Selon un deuxième aspect de la présente invention, un palier d'essai pour mesurer sa dégradation au cours d'un essai d'endurance, dans 30 lequel des capteurs, type résistance électrique, fixés sur une surface du palier, disposés en étoile de manière circulaire affleurent l'alésage du palier. Advantageously, six sensors are regularly and circularly distributed around the bore of the bearing. According to a second aspect of the present invention, a test bearing to measure its degradation during an endurance test, in which sensors, electrical resistance type, fixed on a bearing surface, arranged in a star shape. Circular are flush with the bore of the bearing.

L'invention sera mieux comprise à la lecture de la description d'un mode de réalisation de l'invention accompagné des dessins, dans lesquels The invention will be better understood on reading the description of an embodiment of the invention accompanied by the drawings, in which

Fig. 1 montre en coupe transversale un palier avec son axe de sortie 6 selon l'invention, Fig. 2 montre en vue de dessus un palier avec son axe de sortie 6 selon l'invention, Fig. 1 shows in cross section a bearing with its output axis 6 according to the invention, FIG. 2 shows in plan view a bearing with its output axis 6 according to the invention,

Fig. 3 montre en coupe transversale un palier dégradé après un essai 15 d'endurance et Fig. 3 shows in cross-section a degraded step after an endurance test and

Fig. 4 montre en vue de dessus un palier dégradé après un essai d'endurance. Fig. 4 shows in plan view a degraded stage after an endurance test.

20 Comme on voit sur les figures 1 et 2 la surface supérieure du palier est équipée au début d'un essai d'endurance de capteurs 3 comportant chacun une résistance électrique. Ces capteurs sont disposés en étoile de manière circulaire et régulière et affleurent le bord de l'alésage 4. Des câbles électriques 5 sont reliés à des circuits (non représentés) pour 25 mesurer la valeur Rn des résistances électriques neuves de chacun des capteurs 3. Au fur et à mesure du fonctionnement, l'axe de sortie 6 érode le palier 2. Il érode aussi les capteurs 3. As can be seen in FIGS. 1 and 2, the upper surface of the bearing is equipped at the beginning of a sensor endurance test 3 each comprising an electrical resistance. These sensors are arranged in a star in a circular and regular manner and are flush with the edge of the bore 4. Electrical cables 5 are connected to circuits (not shown) to measure the value Rn of the new electrical resistances of each of the sensors 3. As the function proceeds, the output shaft 6 erodes the bearing 2. It also erodes the sensors 3.

A la fin de l'essai d'endurance, on mesure la valeur Rv des 30 résistances électriques des capteurs 3 afin de déduire précisément les prises de jeu sur le pourtour du palier. Ces prises de jeu sont mises en évidence par le calcul du rapport des valeurs Rv/Rn de chacune des10 At the end of the endurance test, the Rv value of the electrical resistances of the sensors 3 is measured in order to precisely deduce the playouts on the periphery of the bearing. These outliers are highlighted by the calculation of the ratio of the Rv / Rn values of each of the 10

résistances permettant ainsi de déterminer les emplacements dégradés dans l'alésage 4. resistors thus making it possible to determine the degraded locations in the bore 4.

Cette dégradation dans l'alésage 4 n'est pas uniforme car l'axe de sortie n'effectue pas une rotation régulière, mais change la direction de rotation à chaque mouvement du balayage des bras d'essuie-glace. Ainsi, des actions correctrices pour limiter la dégradation de la prise de jeu peuvent être envisagées en connaissant bien les endroits sur le pourtour de la surface intérieure de l'alésage qui portent des traces d'usure importante. This degradation in the bore 4 is not uniform because the output axis does not perform a regular rotation, but changes the direction of rotation at each movement of the wiper arm scan. Thus, corrective actions to limit the degradation of the game can be considered knowing well the locations around the inner surface of the bore which bear signs of significant wear.

Après vieillissement, l'axe 6 et le palier 3 ne coïncident plus parfaitement, comme le montrent les figures 3 et 4. L'orientation de l'axe de sortie n'est plus précise. Les capteurs 3 sont collés sur la surface 1 et non pas vissés car un vissage pourrait détériorer les propriétés mécaniques du palier à tester. After aging, the axis 6 and the bearing 3 do not coincide perfectly, as shown in Figures 3 and 4. The orientation of the output shaft is more accurate. The sensors 3 are glued on the surface 1 and not screwed because screwing could deteriorate the mechanical properties of the bearing to be tested.

Une fois la dégradation des paliers mesurée après des essais 20 d'endurance, la rigidité des paliers peut être adaptée et l'épure de balayage peut être optimisée.15 Once the bearing degradation is measured after endurance tests, the stiffness of the bearings can be adapted and the scanning pattern can be optimized.

Claims (1)

REVENDICATIONS1. Méthode pour mesurer la dégradation d'un palier de mécanisme d'essuie-vitre avant d'un véhicule automobile, caractérisée en ce que - on fixe sur une surface (1) du palier (2) des capteurs (3), de type résistance électrique, disposés en étoile de manière circulaire et affleurant l'alésage (4) du palier (2) ; - on mesure la valeur (Rn) des résistances neuves de chacun des capteurs (3) ; - on mesure la valeur (Rv) des résistances de chacun des capteurs (3) après avoir effectué un essai d'endurance - et on détermine l'importance de la dégradation du pourtour de l'alésage (4) par le calcul du rapport Rv/Rn pour chacune des résistances des capteurs (3). 5. Palier d'essai selon la revendication 4, caractérisé en ce que les capteurs (3) sont collés sur la surface (1) du palier (2).2. 3. 4. Méthode pour mesurer la dégradation selon la revendication 1, caractérisée en ce que les capteurs (3) sont collés sur la surface (1) du palier. Méthode pour mesurer la dégradation selon la revendication 1 ou 2, caractérisée en ce que six capteurs (3) sont répartis de manière régulière et circulaire autour de l'alésage du palier. Palier d'essai pour mesurer sa dégradation pendant un essai d'endurance, caractérisé par des capteurs (3), de type résistance électrique, fixés sur une surface (1) du palier (2), disposés en étoile de manière circulaire affleurent l'alésage (4) du palier.6. Palier d'essai selon la revendication 4 ou 5, caractérisé en ce que six capteurs (3) sont répartis de manière régulière et circulaire autour de l'alésage (4) du palier. REVENDICATIONS1. Method for measuring the deterioration of a windscreen wiper mechanism bearing of a motor vehicle, characterized in that - (1) bearing-type sensors (3) are fixed on a surface (1) of the bearing (2). electrical, arranged in a star circular manner and flush with the bore (4) of the bearing (2); the value (Rn) of the new resistances of each of the sensors (3) is measured; the value (Rv) of the resistances of each of the sensors (3) is measured after having carried out an endurance test and the importance of the deterioration of the periphery of the bore (4) is determined by the calculation of the ratio Rv. / Rn for each of the resistors of the sensors (3). 5. Test bearing according to claim 4, characterized in that the sensors (3) are glued on the surface (1) of the bearing (2) .2. 3. 4. Method for measuring the degradation according to claim 1, characterized in that the sensors (3) are glued on the surface (1) of the bearing. Method for measuring the degradation according to claim 1 or 2, characterized in that six sensors (3) are regularly and circularly distributed around the bore of the bearing. Test bearing for measuring its degradation during an endurance test, characterized by sensors (3), of electrical resistance type, fixed on a surface (1) of the bearing (2), circularly arranged in a star-shaped position bore (4) of the bearing. Test bearing according to Claim 4 or 5, characterized in that six sensors (3) are uniformly and circularly distributed around the bore (4) of the bearing.
FR1058361A 2010-10-14 2010-10-14 METHOD FOR MEASURING THE DEGRADATION OF A WINDSCREEN WIPER MECHANISM BEARING BEFORE A MOTOR VEHICLE Expired - Fee Related FR2966243B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109459219A (en) * 2018-10-30 2019-03-12 江苏云睿汽车电器系统有限公司 A kind of windscreen wiper disk grooming platform device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2520672A1 (en) * 1975-05-09 1976-11-18 Erich Brosa Force measuring instrument of versatile construction - uses conical bending rod with attached strain gauges
US20020005724A1 (en) * 2000-05-16 2002-01-17 Childs Dara W. System and method for measuring dynamic loads in a magnetic bearing
DE102008018611A1 (en) * 2008-04-11 2009-10-15 Riemer, Detlef, Prof. Dr.-Ing. Contact measuring method for surveying surface area of operating roller bearings and roller guides, involves detecting symptoms of wear and fatigue by tactile surface sensor integrated in roller bearings and roller guides

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2520672A1 (en) * 1975-05-09 1976-11-18 Erich Brosa Force measuring instrument of versatile construction - uses conical bending rod with attached strain gauges
US20020005724A1 (en) * 2000-05-16 2002-01-17 Childs Dara W. System and method for measuring dynamic loads in a magnetic bearing
DE102008018611A1 (en) * 2008-04-11 2009-10-15 Riemer, Detlef, Prof. Dr.-Ing. Contact measuring method for surveying surface area of operating roller bearings and roller guides, involves detecting symptoms of wear and fatigue by tactile surface sensor integrated in roller bearings and roller guides

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109459219A (en) * 2018-10-30 2019-03-12 江苏云睿汽车电器系统有限公司 A kind of windscreen wiper disk grooming platform device

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