EP0243254B1 - Rotary potentiometer sensor for determining the position or the angular displacement of a rotating shaft - Google Patents

Rotary potentiometer sensor for determining the position or the angular displacement of a rotating shaft Download PDF

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Publication number
EP0243254B1
EP0243254B1 EP87400885A EP87400885A EP0243254B1 EP 0243254 B1 EP0243254 B1 EP 0243254B1 EP 87400885 A EP87400885 A EP 87400885A EP 87400885 A EP87400885 A EP 87400885A EP 0243254 B1 EP0243254 B1 EP 0243254B1
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EP
European Patent Office
Prior art keywords
rotating
case
shaft
sensor
parts
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Expired
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EP87400885A
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German (de)
French (fr)
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EP0243254A1 (en
Inventor
Jean Fernand Simon
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MCB SA
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MCB SA
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Priority to AT87400885T priority Critical patent/ATE47634T1/en
Publication of EP0243254A1 publication Critical patent/EP0243254A1/en
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Publication of EP0243254B1 publication Critical patent/EP0243254B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/14—Adjustable resistors adjustable by auxiliary driving means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H01C10/32—Adjustable resistors the contact sliding along resistive element the contact moving in an arcuate path

Definitions

  • the present invention relates to rotary potentiometer sensors for locating the position or angular displacement of a rotating shaft.
  • such sensors in order to determine the position or the displacement of a rotating shaft, in particular in order to copy this position or this displacement from a distance.
  • the accuracy of the indications provided by a potentiometric sensor on the position or the angular displacement of a rotating shaft is generally limited by the error of concentricity between this shaft and the sensor. Indeed, between the rotating part or rotor of the sensor and the shaft whose position or displacement we want to know, we must provide a constant velocity joint, which has the disadvantage of requiring space, complicating the mounting between the 'shaft and the sensor and to expose to dust and various projections this seal, especially in the case where the potentiometric sensor is placed under the hood of an automobile, hence premature wear; thought has been given to protecting the joint, but this requires additional parts which increase the cost and the bulk.
  • the invention aims to overcome the aforementioned drawbacks by arranging the seal between the shaft, the position or displacement of which is to be known, and the rotating part of the sensor, around the free end of said shaft, which reduces the bulk. , by housing said end of the shaft and the rotating joint itself inside the sensor housing, which ensures the protection of the joint at no additional cost.
  • the sensor according to the invention makes it possible, in particular in its application to automobiles, to obtain a very high angular precision, for example less than 1 °, without precision machining and without requiring costly additional parts.
  • the subject of the invention is a sensor with a rotary potentiometer for locating the position or the angular displacement of a rotating shaft, which comprises, for the constant velocity transmission of the rotation of said shaft to the rotating part or rotor of the sensor, an Oldham type seal with, on the one hand, three rotating parts, namely a first part carried and driven in rotation by said shaft, a second part capable of rotating inside the sensor of which it constitutes the rotating part or rotor and a third part, called the intermediate part, disposed between the first and the second part, and, on the other hand, means, provided on these three parts, for ensuring the constant-velocity drive of the intermediate part by the first part and of the second part by the intermediate part, while allowing an angular movement between the axis of said shaft and the axis of the rotating part or rotor of the sensor, sensor characterized in that it comprises rte a generally cylindrical housing containing the free end of said rotating shaft and the three rotating parts of said seal, this housing having two lateral faces
  • a sensor 1 intended to identify the position or movement of a rotating shaft 2, firstly comprises a housing 3 of generally cylindrical shape, one of the faces of which is closed by a cover 4 which is welded, crimped or glued to the body 3a of the housing, this cover 4 carrying the connector 5 of the sensor, and whose other lateral face 6, which is an integral part of the body 3a of the housing, carries a circular tube 7 which is surrounded by a flange circular 8 concentric with the tube 7 and disposed outside and at a distance therefrom, this flange 7 serving for centering the housing 3 in a bore 9 which is crossed by the shaft 2.
  • This rotating part 10 comprises a flat circular ring 11 and a tubular centering ring 12 which can rotate, with at least one play equal to the reasonably conceivable maximum concentricity error in the circular tube 7.
  • the rotation of the rotating part 10 by the shaft 2 is ensured for example by providing a portion inside the centering ring 12 plane 13 which cooperates with a corresponding flat portion 14 formed on the free end 2a of the shaft 2.
  • the rotating part 10 constitutes the first element 1 of an Oldham seal which comprises two other rotating parts, namely an intermediate part 15 constituted by a flat circular crown and a second rotating part 16, which is a driven part, constitutes the rotor or rotating part of the sensor.
  • the part 16 comprises a flat circular crown 17 which carries, on the one hand, a tubular portion 18, which can rotate with gentle friction around the circular tube 7, and, on the other hand, a brush-carrying element 19 including the brushes 20 rub on a conductive track 21 disposed on a part 22 of the internal lateral surface of the housing 3.
  • a helical return spring 26 is disposed, inside the housing 3, between the internal surface 27 of the side face 6 of the housing carrying the pipe 7 and the crown 17 of the second rotating part 16 to ensure the take-up of the play of rotation between the parts 2, 10, 15, 16 by exerting a restoring torque which ensures, when stopped or during the rotation of the shaft 2, the application of the flat portion 14 of the rotating shaft 2 on the internal flat portion 13 of the first rotating part 10, pins 24 on the notches 23a of the intermediate part 15, notches 23b on the pins 25 of the second rotating part 16.
  • the rotation of the shaft 2 causes, by the flat surfaces 13 and 14, the rotation of the first rotating part 10 whose pins 24, by cooperating with the notches 23a of the intermediate part 15, drive the latter in rotation, while that the cooperation of the pins 25 of the second rotating part 16 and the notches 23b ensures the rotational drive of the second rotating part 16. Therefore the rotation of the shaft 2 causes the rotation of the second in a homokinetic manner rotating part 16 and therefore of the brush holder 19 whose brushes 20 move on the fixed conductive track 21 carried by the housing 3.
  • the position of the brushes 20 on the conductive track 21 is processed in the connector 5 of the sensor and used as desired, in particular to ensure remote copying of the position or of the displacement of the rotating shaft 2.
  • a compact sensor is produced, well protected from dust and which allows very high precision to be obtained marking the position or displacement of a rotating shaft, for example an accuracy of less than 1 °.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

A rotary potentiometer sensor is provided for detecting the angular position or movement of a rotary shaft, which includes, a joint of the Oldham type with, on the one hand, three rotary parts, namely a first part carried and driven in rotation by the shaft, a second part adapted for rotating inside the sensor of which it forms the rotary part and a third part, called intermediate part, disposed between the first and second parts and, on the other hand, means provided on these three parts for providing the homocinetic rotational drive of the intermediate part by the first part and of the second part by the intermediate part, while allowing free angular movement; and a case of a general cylindrical shape containing said rotating shaft and the three rotating parts of said joint, this case having two lateral faces one of which is completely closed by a cover integral with the case and the other of which has passing therethrough a circular tube integral with the case and whose internal bore receives the first part which covers the free end of said shaft and whose peripheral surface is surrounded by the second part and the intermediate part.

Description

La présente invention est relative aux capteurs à potentiomètre rotatif destinés à repérer la position ou le déplacement angulaire d'un arbre tournant.The present invention relates to rotary potentiometer sensors for locating the position or angular displacement of a rotating shaft.

On utilise fréquemment dans les dispositifs et appareils industriels, en particulier dans les automobiles, de tels capteurs afin de déterminer la position ou le déplacement d'un arbre tournant, notamment afin de recopier cette position ou ce déplacement à distance.Frequently used in industrial devices and apparatuses, in particular in automobiles, such sensors in order to determine the position or the displacement of a rotating shaft, in particular in order to copy this position or this displacement from a distance.

La précision des indications fournies par un capteur potentiométrique sur la position ou le déplacement angulaire d'un arbre tournant est généralement limitée par l'erreur de concentricité entre cet arbre et le capteur. En effet, entre la partie tournante ou rotor du capteur et l'arbre dont on veut connaître la position ou le déplacement, on doit prévoir un joint homocinétique, ce qui a pour inconvénient d'exiger de la place, de compliquer le montage entre l'arbre et le capteur et d'exposer aux poussières et aux projections diverses ce joint, notamment dans le cas où le capteur potentiométrique est disposé sous le capot d'une d'automobile, d'où une usure prématurée; on a bien pensé à protéger le joint, mais ceci exige des pièces supplémentaires qui augmentent le coût et l'encombrement.The accuracy of the indications provided by a potentiometric sensor on the position or the angular displacement of a rotating shaft is generally limited by the error of concentricity between this shaft and the sensor. Indeed, between the rotating part or rotor of the sensor and the shaft whose position or displacement we want to know, we must provide a constant velocity joint, which has the disadvantage of requiring space, complicating the mounting between the 'shaft and the sensor and to expose to dust and various projections this seal, especially in the case where the potentiometric sensor is placed under the hood of an automobile, hence premature wear; thought has been given to protecting the joint, but this requires additional parts which increase the cost and the bulk.

L'invention vise à pallier les inconvénients précités en disposant le joint entre l'arbre, dont on veut connaître la position ou le déplacement, et la partie tournante du capteur, autour de l'extrémité libre dudit arbre, ce qui réduit l'encombrement, en logeant ladite extrémité de l'arbre et le joint tournant lui-même à l'intérieur du boîtier du capteur, ce qui assure la protection du joint sans coût supplémentaire.The invention aims to overcome the aforementioned drawbacks by arranging the seal between the shaft, the position or displacement of which is to be known, and the rotating part of the sensor, around the free end of said shaft, which reduces the bulk. , by housing said end of the shaft and the rotating joint itself inside the sensor housing, which ensures the protection of the joint at no additional cost.

Le capteur selon l'invention permet, notamment dans son application aux automobiles, d'obtenir une précision angulaire très grande, par exemple inférieure à 1°, sans usinage de précision et sans nécessiter des pièces supplémentaires coûteuses.The sensor according to the invention makes it possible, in particular in its application to automobiles, to obtain a very high angular precision, for example less than 1 °, without precision machining and without requiring costly additional parts.

Plus précisément l'invention a pour objet un capteur à potentiomètre rotatif pour le repérage de la position ou du déplacement angulaire d'un arbre tournant, qui comporte, pour la transmission homocinétique de la rotation dudit arbre à la partie tournante ou rotor du capteur, un joint du type Oldham avec, d'une part, trois pièces tournantes, à savoir une première pièce portée et entraînée en rotation par ledit arbre, une deuxième pièce apte à tourner à l'intérieur du capteur dont elle constitue la partie tournante ou rotor et une troisième pièce, dite pièce intermédiaire, disposée entre la première et la deuxième pièces, et, d'autre part, des moyens, prévus sur ces trois pièces, pour assurer l'entraînement en rotation homocinétique de la pièce intermédiaire par la première pièce et de la deuxième pièce par la pièce intermédiaire, tout en permettant un débattement angulaire entre l'axe dudit arbre et l'axe de la partie tournante ou rotor du capteur, capteur caractérisé en ce qu'il comporte un boîtier de forme générale cylindrique contenant l'extrémité libre dudit arbre tournant et les trois pièces tournantes dudit joint, ce boîtier présentant deux faces latérales dont l'une est complètement fermée par un couvercle solidaire du boîtier et dont l'autre est traversée par un tube circulaire solidaire du boîtier et dont l'alésage interne reçoit, avec un jeu au moins égal à l'erreur de concentricité maximale raisonnablement envisageable, ladite première pièce tournante qui coiffe ladite extrémité libre dudit arbre et dont la surface périphérique est entourée, avec le jeu précité, par ladite deuxième pièce tournante et ladite pièce intermédiaire tournante.More precisely, the subject of the invention is a sensor with a rotary potentiometer for locating the position or the angular displacement of a rotating shaft, which comprises, for the constant velocity transmission of the rotation of said shaft to the rotating part or rotor of the sensor, an Oldham type seal with, on the one hand, three rotating parts, namely a first part carried and driven in rotation by said shaft, a second part capable of rotating inside the sensor of which it constitutes the rotating part or rotor and a third part, called the intermediate part, disposed between the first and the second part, and, on the other hand, means, provided on these three parts, for ensuring the constant-velocity drive of the intermediate part by the first part and of the second part by the intermediate part, while allowing an angular movement between the axis of said shaft and the axis of the rotating part or rotor of the sensor, sensor characterized in that it comprises rte a generally cylindrical housing containing the free end of said rotating shaft and the three rotating parts of said seal, this housing having two lateral faces, one of which is completely closed by a cover secured to the housing and the other of which is traversed by a circular tube integral with the housing and whose internal bore receives, with a clearance at least equal to the error of maximum concentricity reasonably conceivable, said first rotating part which covers said free end of said shaft and whose peripheral surface is surrounded, with the aforementioned clearance, by said second rotating part and said rotating intermediate part.

Avantageusement:Advantageously:

  • - la première pièce tournante comporte une portion tubulaire qui entoure l'extrémité libre de l'arbre tournant et qui peut tourner à frottement doux à l'intérieur dudit tube circulaire;- The first rotating part comprises a tubular portion which surrounds the free end of the rotating shaft and which can rotate with gentle friction inside said circular tube;
  • - la deuxième pièce tournante comporte une portion tubulaire, qui peut tourner à frottement doux autour dudit tube circulaire, et un élément porte-balais, dont les balais frottent sur une piste conductrice disposée sur une partie de la surface latérale interne du boîtier;- The second rotating part comprises a tubular portion, which can rotate with gentle friction around said circular tube, and a brush-carrying element, the brushes of which rub on a conductive track disposed on a part of the internal lateral surface of the housing;
  • - le couvercle du boîtier porte le connecteur du capteur;- the housing cover carries the sensor connector;
  • - le boîtier comporte, du côté de la face latérale qui porte ledit tube circulaire, une collerette circulaire concentrique audit tube et disposée à l'extérieur et à distance de celui-ci, cette collerette servant au centrage du boîtier dans un alésage traversé par ledit arbre;- The housing comprises, on the side of the side face which carries said circular tube, a circular flange concentric with said tube and disposed outside and at a distance therefrom, this flange serving for centering the housing in a bore through which said tree;
  • - la pièce intermédiaire est une couronne circulaire plate, tandis que lesdites première et deuxième pièces tournantes comportent des couronnes circulaires plates, et les moyens d'entraînement en rotation homocinétique des trois pièces tournantes, avec possibilité de débattement angulaire, sont constituées par quatre encoches radiales prévues sur la périphérie de la pièce intermédiaire, à 90° chacune de la précédente dans le sens périphérique, et par deux paires de tétons portées par les couronnes circulaires plates de respectivement ladite première et ladite deuxième pièce tournante sur leur face dirigée vers la pièce intermédiaire, les deux tétons d'une même paire étant diamétralement opposés et la droite réunissant les centres des deux tétons de la paire de la première pièce tournante étant orthogonale à la droite réunissant les centres des deux tétons de la paire de la deuxième pièce tournante;- The intermediate part is a flat circular crown, while said first and second rotating parts comprise flat circular crowns, and the means for driving the constant velocity rotation of the three rotating parts, with the possibility of angular movement, are constituted by four radial notches provided on the periphery of the intermediate piece, at 90 ° each of the previous one in the peripheral direction, and by two pairs of pins carried by the flat circular crowns of said first and said second rotating part respectively on their face directed towards the intermediate piece , the two nipples of the same pair being diametrically opposite and the straight line joining the centers of the two nipples of the pair of the first rotating part being orthogonal to the right joining the centers of the two nipples of the pair of the second rotating part;
  • - la première pièce tournante porte une protubérance centrale contre sa face qui est dirigée du côté du couvercle du boîtier;- The first rotating part carries a central protuberance against its face which is directed towards the side of the housing cover;
  • - l'extrémité libre de l'arbre tournant comporte une portion plane qui coopère avec une portion plane que comporte à son intérieur la portion tubulaire de la première pièce tournante.
    Afin d'assurer la coopération efficace entre les trois pièces tournantes, on peut prévoir:    - The free end of the rotating shaft has a planar portion which cooperates with a planar portion which has inside it the tubular portion of the first rotating part.
    In order to ensure effective cooperation between the three rotating parts, we can provide:
  • - dans un premier mode de réalisation, un ressort hélicoïdal de rappel disposé, à l'intérieur du boîtier, entre la surface interne de la face latérale du boîtier portant ledit tube circulaire et la deuxième pièce tournante pour appliquer cette deuxième pièce contre la pièce intermédiaire, cette pièce intermédiaire contre la première pièce tournante et cette première pièce contre le couvercle du boîtier;- In a first embodiment, a helical return spring disposed, inside the housing, between the internal surface of the side face of the housing carrying said circular tube and the second rotating part to apply this second part against the intermediate part , this intermediate part against the first rotating part and this first part against the housing cover;
  • - dans un second mode de réalisation des languettes faisant partie intégrante de la pièce intermédiaire et maintenant lesdites paires de tétons en contact chacune avec la face en regard de la pièce intermédiaire.- In a second embodiment of the tongues forming an integral part of the intermediate piece and maintaining said pairs of pins each in contact with the opposite face of the intermediate piece.

L'invention pourra, de toute façon, être bien comprise à l'aide du complément de description qui suit, ainsi que des dessins ci-annexés, lesquels complément et dessins sont, bien entendu, donnés surtout à titre d'indication.

  • La figure 1 est une coupe d'un capteur à potentiomètre rotatif, montrant les dispositions selon l'invention.
  • Les figures 2, 3 et 4 représentent les trois pièces tournantes du joint de type Oldham que comporte ce capteur, à savoir respectivement ladite deuxième pièce, ladite pièce intermédiaire et ladite première pièce.
  • La figure 5 est une vue éclatée du capteur de la figure 1.
  • La figure 6, enfin, illustre en vue éclatée partielle une variante du capteur.
The invention may, in any case, be well understood with the aid of the additional description which follows, as well as of the appended drawings, which supplement and drawings are, of course, given mainly by way of indication.
  • Figure 1 is a section of a rotary potentiometer sensor, showing the arrangements according to the invention.
  • Figures 2, 3 and 4 show the three rotating parts of the Oldham type seal that includes this sensor, namely respectively said second part, said intermediate part and said first part.
  • FIG. 5 is an exploded view of the sensor of FIG. 1.
  • Figure 6, finally, illustrates in partial exploded view a variant of the sensor.

Selon l'invention, et plus spécialement selon celui de ses modes d'application, auquel il semble qu'il y ait lieu d'accorder la préférence, se proposant, de réaliser un capteur à potentiomètre rotatif pour le repérage de la position ou du déplacement d'un arbre tournant, on s'y prend comme suit ou d'une manière analogue.According to the invention, and more particularly according to that of its modes of application, to which it seems that there is reason to grant preference, proposing, to produce a sensor with a rotary potentiometer for locating the position or the displacement of a rotating shaft, it is done as follows or in a similar manner.

Un capteur 1 selon l'invention, destiné à repérer la position ou le déplacement d'un arbre tournant 2, comporte tout d'abord un boîtier 3 de forme générale cylindrique, dont une des faces est fermée par un couvercle 4 qui est soudé, serti ou collé sur le corps 3a du boîtier, ce couvercle 4 portant le connecteur 5 du capteur, et dont l'autre face latérale 6, qui fait partie intégrante du corps 3a du boîtier, porte un tube circulaire 7 qui est entouré par une collerette circulaire 8 concentrique au tube 7 et disposée à l'extérieur et à distance de celui-ci, cette collerette 7 servant au centrage du boîtier 3 dans un alésage 9 qui est traversé par l'arbre 2.A sensor 1 according to the invention, intended to identify the position or movement of a rotating shaft 2, firstly comprises a housing 3 of generally cylindrical shape, one of the faces of which is closed by a cover 4 which is welded, crimped or glued to the body 3a of the housing, this cover 4 carrying the connector 5 of the sensor, and whose other lateral face 6, which is an integral part of the body 3a of the housing, carries a circular tube 7 which is surrounded by a flange circular 8 concentric with the tube 7 and disposed outside and at a distance therefrom, this flange 7 serving for centering the housing 3 in a bore 9 which is crossed by the shaft 2.

Une première pièce tournante 10, qui est une pièce d'entraînement, est solidaire en rotation de l'arbre 2. Cette pièce tournante 10 comporte une couronne circulaire plate 11 et une bague de centrage tubulaire 12 qui peut tourner, avec un jeu au moins égal à l'erreur de concentricité maximale raisonnablement envisageable, dans le tube circulaire 7. L'entraînement en rotation de la pièce tournante 10 par l'arbre 2 est assuré par exemple en prévoyant à l'intérieur de la bague de centrage 12 une portion plane 13 qui coopère avec une portion plane correspondante 14 ménagée sur l'extrémité libre 2a de l'arbre 2.A first rotating part 10, which is a drive part, is integral in rotation with the shaft 2. This rotating part 10 comprises a flat circular ring 11 and a tubular centering ring 12 which can rotate, with at least one play equal to the reasonably conceivable maximum concentricity error in the circular tube 7. The rotation of the rotating part 10 by the shaft 2 is ensured for example by providing a portion inside the centering ring 12 plane 13 which cooperates with a corresponding flat portion 14 formed on the free end 2a of the shaft 2.

La pièce tournante 10 constitue le premier élément 1 d'un joint de Oldham qui comporte deux autres pièces tournantes, à savoir une pièce intermédiaire 15 constituée par une couronne circulaire plate et une deuxième pièce tournante 16, qui est une pièce entraînée, constitue le rotor ou partie tournante du capteur.The rotating part 10 constitutes the first element 1 of an Oldham seal which comprises two other rotating parts, namely an intermediate part 15 constituted by a flat circular crown and a second rotating part 16, which is a driven part, constitutes the rotor or rotating part of the sensor.

La pièce 16 comprend une couronne circulaire plate 17 qui porte, d'une part, une portion tubulaire 18, qui peut tourner à frottement doux autour du tube circulaire 7, et, d'autre part, un élément porte-balais 19 dont les balais 20 frottent sur une piste conductrice 21 disposée sur une partie 22 de la surface latérale interne du boîtier 3.The part 16 comprises a flat circular crown 17 which carries, on the one hand, a tubular portion 18, which can rotate with gentle friction around the circular tube 7, and, on the other hand, a brush-carrying element 19 including the brushes 20 rub on a conductive track 21 disposed on a part 22 of the internal lateral surface of the housing 3.

La solidarisation en rotation entre les trois éléments 10, 15 et 16 du joint d'Oldham, tout en permettant un débattement angulaire entre l'axe de l'arbre 2 et l'axe de la partie tournante ou rotor du capteur, est assurée de la manière suivante:

  • - la pièce intermédiaire 15 présente deux encoches 23a et deux encoches 23b disposées à 90° chacune de la précédente, dans le sens périphérique, les deux encoches 23a, d'une part, et 23b, d'autre part, étant diamétralement opposées;
  • - la première pièce tournante 10 comporte deux tétons 24, diamétralement opposés, portés par la face de la couronne circulaire 11 de cette pièce 10 qui est dirigée de côté de la pièce intermédiaire 15, ces tétons 24 pénétrant dans les encoches 23a de la pièce intermédiaire 15; et
  • - la deuxième pièce tournante 16 comporte deux tétons 25, diamétralement opposés, portés par la face de la couronne circulaire plate 17 de cette pièce 16 qui est dirigée du côté de la pièce intermédiaire 15, ces tétons 25 pénétrant dans les encoches 23b de cette pièce 15.
The joining in rotation between the three elements 10, 15 and 16 of the Oldham seal, while allowing angular clearance between the axis of the shaft 2 and the axis of the rotating part or rotor of the sensor, is ensured by as follows:
  • - The intermediate piece 15 has two notches 23a and two notches 23b arranged at 90 ° each of the previous one, in the peripheral direction, the two notches 23a, on the one hand, and 23b, on the other hand, being diametrically opposite;
  • - The first rotating part 10 comprises two studs 24, diametrically opposite, carried by the face of the circular crown 11 of this piece 10 which is directed towards the side of the intermediate piece 15, these studs 24 penetrating into the notches 23a of the intermediate piece 15; and
  • - The second rotating part 16 comprises two pins 25, diametrically opposite, carried by the face of the flat circular crown 17 of this part 16 which is directed towards the side of the intermediate part 15, these pins 25 penetrating into the notches 23b of this part 15.

Un ressort hélicoïdale de rappel 26 est disposé, à l'intérieur de boîtier 3, entre la surface interne 27 de la face latérale 6 du boîtier portant le tuyau 7 et la couronne 17 de la deuxième pièce tournante 16 pour assurer le rattrapage du jeu de rotation entre les pièces 2, 10, 15, 16 en exerçant un couple de rappel qui assure, à l'arrêt ou pendant la rotation de l'arbre 2, l'application de la portion plane 14 de l'arbre tournant 2 sur la portion plane interne 13 de la première pièce tournante 10, des tétons 24 sur les encoches 23a de la pièce intermédiaire 15, des encoches 23b sur les tétons 25 de la deuxième pièce tournante 16.A helical return spring 26 is disposed, inside the housing 3, between the internal surface 27 of the side face 6 of the housing carrying the pipe 7 and the crown 17 of the second rotating part 16 to ensure the take-up of the play of rotation between the parts 2, 10, 15, 16 by exerting a restoring torque which ensures, when stopped or during the rotation of the shaft 2, the application of the flat portion 14 of the rotating shaft 2 on the internal flat portion 13 of the first rotating part 10, pins 24 on the notches 23a of the intermediate part 15, notches 23b on the pins 25 of the second rotating part 16.

Une protubérance centrale 28, portée par la face 29 de la couronne circulaire 11 qui est en regard du couvercle 4, assure le contact, avec possibilité de débattement, entre la couronne circulaire 11 de la première pièce tournante 10 et le couvercle 4 en réduisant le frottement.A central protuberance 28, carried by the face 29 of the circular crown 11 which is opposite the cover 4, ensures contact, with the possibility of clearance, between the crown circular 11 of the first rotating part 10 and the cover 4 by reducing friction.

Le fonctionnement du capteur potentiométrique selon l'invention est le suivant.The operation of the potentiometric sensor according to the invention is as follows.

La rotation de l'arbre 2 entraîne, par les surfaces planes 13 et 14, la rotation de la première pièce tournante 10 dont les tétons 24, en coopérant avec les encoches 23a de la pièce intermédiaire 15, entraînent celle-ci en rotation, tandis que la coopération des tétons 25 de la deuxième pièce tournante 16 et des encoches 23b assure l'entraînement en rotation de la deuxième pièce tournante 16. De ce fait la rotation de l'arbre 2 entraîne d'une manière homocinétique la rotation de la deuxième pièce tournante 16 et donc du porte-balais 19 dont les balais 20 se déplacent sur la piste conductrice fixe 21 portée par le boîtier 3.The rotation of the shaft 2 causes, by the flat surfaces 13 and 14, the rotation of the first rotating part 10 whose pins 24, by cooperating with the notches 23a of the intermediate part 15, drive the latter in rotation, while that the cooperation of the pins 25 of the second rotating part 16 and the notches 23b ensures the rotational drive of the second rotating part 16. Therefore the rotation of the shaft 2 causes the rotation of the second in a homokinetic manner rotating part 16 and therefore of the brush holder 19 whose brushes 20 move on the fixed conductive track 21 carried by the housing 3.

A la manière connue, la position des balais 20 sur la piste conductrice 21 est traitée dans le connecteur 5 du capteur et utilisée comme désiré, notamment pour assurer la recopie à distance de la position ou du déplacement de l'arbre tournant 2.In the known manner, the position of the brushes 20 on the conductive track 21 is processed in the connector 5 of the sensor and used as desired, in particular to ensure remote copying of the position or of the displacement of the rotating shaft 2.

Dans une variante illustrée sur la figure 6 (sur laquelle on retrouve le boîtier 3 et les trois pièces tournantes 10, 15 et 16, ainsi que les tétons 24 de la pièce 10 et 25 de la pièce 16, et les encoches 23a, 23b de la pièce 15) on a remplacé le ressort 26 du mode de réalisation des figures 1 à 5 par quatre languettes 15a faisant partie intégrante de la pièce intermédiaire 15 et qui maintiennent les tétons 24 et 25 en contact avec la face en regard de cette pièce 15.In a variant illustrated in Figure 6 (in which we find the housing 3 and the three rotating parts 10, 15 and 16, as well as the pins 24 of the part 10 and 25 of the part 16, and the notches 23a, 23b of part 15) the spring 26 of the embodiment of FIGS. 1 to 5 has been replaced by four tongues 15a forming an integral part of the intermediate part 15 and which keep the pins 24 and 25 in contact with the opposite face of this part 15 .

On réalise ainsi, selon l'invention - et notamment selon les deux modes de réalisation (figures 1 - 5 et figure 6) particulièrement décrits - un capteur compact, bien à l'abri des poussières et qui permet d'obtenir une précision très grande du repérage de la position ou du déplacement d'un arbre tournant, par exemple une précision inférieure à 1°.Thus, according to the invention - and in particular according to the two embodiments (FIGS. 1 - 5 and FIG. 6) particularly described - a compact sensor is produced, well protected from dust and which allows very high precision to be obtained marking the position or displacement of a rotating shaft, for example an accuracy of less than 1 °.

Claims (10)

1. A rotary potentiometer sensor for detecting the position or movement of a rotary shaft, which includes, for the homocinetic transmission of the rotation of said shaft to the rotary part or rotor of the sensor, a joint of the Oldham type with, on the one hand, three rotary parts, namely a first part (10) carried and driven in rotation by said shaft (2), a second part (16) adapted for rotating inside the sensor of which it forms the rotary part or rotor and a third part, called intermediate part (15), disposed between the first and second parts and, on the other hand, means (23a, 23b, 24, 25) provided on these three parts for providing the homocinetic rotational drive of the intermediate pert by the first pert and of the second part by the intermediate part, while allowing free angular movement between the axis of said shaft and the axis of the rotating part or rotor of the sensor, said sensor being characterised in that it it includes a case (3) of a general cylindrical shape containing said rotating shaft and the three rotating parts of said joint, this case having two lateral faces one of which is completely closed by a cover (4) integral with the case and the other of which (6) has passing therethrough a circular tube (7) integral with the case and whose internal bore receives, with a clearence at least equal to the maximum error of concentricity which may be reasonably envisaged, said first rotating part which covers the free end (2a) of said shaft and whose peripheral surface is surrounded, with said clearance, by said second rotating part part and said intermediate rotating part.
2. Sensor according to claim 1, characterised in that the first rotating part (10) has a tubular portion (12) which surrounded the free end (2a) of the rotary shaft (2), and which may rotate, with said play, inside said circular tube (7).
3. Sensor according to claim 1 or 2, characterized in that the second rotating part (16) includes a tubular portion (17) which may rotate with an easy fit about said circular tube (7), and a brush holding element (19) whose brushes rub against a conducting track (21) disposed on a part of the internal lateral surface of the case (3).
4. Sensor according to any one of the preceding claims, characterized in that the cover (4) of the case (3) carries the connector (5) of the sensor.
5. Sensor according any one of the preceding claims, characterized in that the case (3) has, on the same side as the lateral face (6) which carries said circular tube (7) a circular collar concentric to said the and disposed outside and at a distance therefrom, this collar serving for centering the case in a bore (9) through which said shaft (2) passes.
6. Sensor according to any one of the preceding claims, characterised in that the intermediate part (15) is a flat circular ring, whereas said first and second rotating parts (10; 16) include flat circular rings (11; 17) and means for the homocinetic rotational drive of the three rotating parts, with the possibility of free angular movement, are formed by four radial slots (23a, 23b) provided on the periphery of the intermediate part, each at 90 from the preceding one in the peripheral direction, and by two pairs of studs (24; 25) carried by the flat circular rings of respectively said first and said second rotating parts on their face directed towards the intermediate part, the two studs of the same pair being diametrically opposite and the straight line joining the centers of the two studs of the pair of the first rotating part being orthogonal to the straight line joining the centers of the two studs of the pair of the second rotating part.
7. Sensor according to any one of the preceding claims, characterized in that the first rotating part (10) has a central protuberance (28) against its face (29) which is directed in the direction of the cover (4) of the case (3).
8. Sensor according to any one of the preceding claims, characterized in that the free end of the rotating shaft (2) includes a flat portion (14) which cooperates with a flat portion (13) formed inside the tubular portion (12) of the first rotating part (10).
9. Sensor according to any one of the preceding claims, characterized in that a helical recall spring (26) is disposed, inside the case (3) between the internal surface (27) of the lateral face (6) of the case bearing said circular tube (7) and the second rotating part (16) for applying this second part against the intermediate part (15), this intermediate part against the first rotating part (10) and this first part against the cover (4) of the case (3), so as to ensure efficient cooperation of the three rotating parts.
10. Sensor according to any one of claims 1 to 8, characterized in that the intermediate part (15) has tongues (15a) forming an integral part thereof and holding said pairs of studs (24; 25) in contact each with the opposite face of the intermediate part.
EP87400885A 1986-04-25 1987-04-17 Rotary potentiometer sensor for determining the position or the angular displacement of a rotating shaft Expired EP0243254B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87400885T ATE47634T1 (en) 1986-04-25 1987-04-17 THEHPOTENTIOMETER SENSOR FOR DETERMINING THE POSITION OR ROTATIONAL MOVEMENT OF A ROTATING SHAFT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8606049A FR2597970A1 (en) 1986-04-25 1986-04-25 SENSOR WITH ROTARY POTENTIOMETER FOR LOCATING THE ANGULAR POSITION OR MOVEMENT OF A ROTATING SHAFT
FR8606049 1986-04-25

Publications (2)

Publication Number Publication Date
EP0243254A1 EP0243254A1 (en) 1987-10-28
EP0243254B1 true EP0243254B1 (en) 1989-10-25

Family

ID=9334646

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87400885A Expired EP0243254B1 (en) 1986-04-25 1987-04-17 Rotary potentiometer sensor for determining the position or the angular displacement of a rotating shaft

Country Status (5)

Country Link
US (1) US4743882A (en)
EP (1) EP0243254B1 (en)
AT (1) ATE47634T1 (en)
DE (1) DE3760894D1 (en)
FR (1) FR2597970A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197484B (en) * 1986-10-24 1990-08-29 Yazaki Corp Liquid level indicator
US5200747A (en) * 1990-12-13 1993-04-06 Bourns, Inc. Turn counting position sensor
US5460035A (en) * 1993-06-23 1995-10-24 Cts Corporation Bearing free spring free throttle position sensor
US5539373A (en) * 1993-11-08 1996-07-23 Cts Corporation Rotor structure for a position sensor
JP3724669B2 (en) * 1996-08-30 2005-12-07 船井電機株式会社 Position detection switch
US6691678B1 (en) * 2000-04-05 2004-02-17 Hitachi, Ltd. Throttle assembly for internal combustion engine, and throttle sensor
JP5692147B2 (en) * 2012-04-18 2015-04-01 株式会社安川電機 Rotating electric machine
CN113701622B (en) * 2021-10-29 2022-03-18 成都宏明电子股份有限公司 Concentric positioning device for testing return stroke difference of angular displacement potentiometer

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Publication number Priority date Publication date Assignee Title
DE185443C (en) *
US4355293A (en) * 1979-10-22 1982-10-19 The Bendix Corporation Electrical resistance apparatus having integral shorting protection
DE3042515C2 (en) * 1980-11-11 1984-01-05 Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka Electrical rotary actuator element
US4430634A (en) * 1982-01-18 1984-02-07 Cts Corporation Rotary potentiometer with molded terminal package
US4616504A (en) * 1983-05-03 1986-10-14 Duncan Electronics Throttle position sensor
FR2560428B1 (en) * 1984-02-28 1987-02-27 Renix Electronique Sa ROTARY POTENTIOMETER IN PARTICULAR FOR ANGULAR POSITION MEASUREMENT
US4539963A (en) * 1984-11-13 1985-09-10 General Motors Corporation Shaft mounted valve position sensor

Also Published As

Publication number Publication date
ATE47634T1 (en) 1989-11-15
DE3760894D1 (en) 1989-11-30
US4743882A (en) 1988-05-10
FR2597970A1 (en) 1987-10-30
EP0243254A1 (en) 1987-10-28

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