EP0157666B1 - Rotating potentiometer, particularly for angular position measurement - Google Patents

Rotating potentiometer, particularly for angular position measurement Download PDF

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Publication number
EP0157666B1
EP0157666B1 EP85400363A EP85400363A EP0157666B1 EP 0157666 B1 EP0157666 B1 EP 0157666B1 EP 85400363 A EP85400363 A EP 85400363A EP 85400363 A EP85400363 A EP 85400363A EP 0157666 B1 EP0157666 B1 EP 0157666B1
Authority
EP
European Patent Office
Prior art keywords
rotor
spring
brush
potentiometer
potentiometer according
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.)
Expired
Application number
EP85400363A
Other languages
German (de)
French (fr)
Other versions
EP0157666A1 (en
Inventor
Gilbert Echasseriau
Philippe Lefevre
Patrick Oliveau
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.)
Bendix Electronics SA
Original Assignee
Siemens Automotive SA
Bendix Electronics SA
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 Siemens Automotive SA, Bendix Electronics SA filed Critical Siemens Automotive SA
Priority to AT85400363T priority Critical patent/ATE31839T1/en
Publication of EP0157666A1 publication Critical patent/EP0157666A1/en
Application granted granted Critical
Publication of EP0157666B1 publication Critical patent/EP0157666B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • 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 invention relates to a rotary potentiometer, in particular for measuring the angular position of a rotary member such as the throttle valve of an internal combustion engine.
  • Known rotary potentiometers of the type comprising a fixed body provided internally with a resistive track against which is applied a friction brush carried by a rotor mounted in the body and biased by a helical spring in a rest position defined by the coming into abutment of a part of the rotor against a stop of the body.
  • Rotation of the rotor makes it possible to vary the internal resistance of the potentiometer so that the ratio between the output and input voltages of the potentiometer is representative of the angle of rotation of the rotor relative to its rest position.
  • the measurement of this ratio can therefore be used in a potentiometric sensor to characterize the angular position of a rotary member with respect to a fixed reference.
  • the invention aims to provide a potentiometer of the aforementioned type which is of a particularly simple construction while making it possible to remedy the drawbacks of potentiometers of the prior art, in particular to avoid the use of an additional tool for the introduction of the brush into the body.
  • the object of the invention is a rotary potentiometer comprising a fixed body having a resistive track, an elastic brush carried by a rotor mounted for rotation in the body and adapted, in operation, to rub against the resistive track, and a spring interposed between the fixed body and the rotor to urge the latter towards a rest position, characterized in that the body comprises at least one housing capable of receiving the brush without prestressing or deformation in an initial position for introducing the rotor into the body and to allow the brush to come into contact with the track when the rotor is mounted in the body by rotation of said rotor between its insertion position and its rest position.
  • the known potentiometers of the aforementioned type do not offer the possibility of obtaining with the same body and the same rotor a return of the rotor to its rest position either in the direct direction or in the indirect direction.
  • a potentiometer when such a potentiometer is intended for example to measure the angular position of the throttle valve of an internal combustion engine, its rational use requires having the same direction of return of the rotor and the throttle valve under the action their respective return spring.
  • the rotor is driven by the throttle axis when the engine load increases and does not hinder the return of the throttle to the "lifted" position.
  • the rotor would follow the throttle during the load increase, but could block its return to the "raised foot" position.
  • the invention achieves this goal by means of a potentiometer as defined above, characterized in that the body and the rotor have an axial plane of symmetry allowing their selective assembly with the either of two types of spring, one of which recalls the rotor in the direct direction and the other in the indirect direction and in that the rotor has two zones for fixing the brush in one or the other. 'other of two symmetrical positions relative to this plane, according to the return direction of the spring.
  • the helical return spring generally has one of these fixing lugs parallel to the axis of the spring and the other in the plane of its turns.
  • a hole in the body of the potentiometer receives the first tab while the second is blocked by a stop on the rotor.
  • the spring is a helical spring having at its ends locking tabs extending radially in the plane of the turns of the spring and one of which is adapted to be engaged axially in immobilization means provided in the body and the other to bear against a first abutment surface of the rotor.
  • the potentiometer shown essentially comprises a body 1 in which a rotor 2 carrying an electric friction brush only conductor 3 and an actuating lever 4 is biased towards its rest position by a helical spring 5a.
  • the body 1 has substantially the shape of a bowl, for example of molded plastic, the bottom 6 of which is pierced with a hole 7 also delimited by a tubular extension 8 projecting from the bottom 6 of the bowl.
  • the tubular extension 8 of height less than the peripheral wall 9 of the bowl, defines with the latter and the bottom 6 a cavity 10.
  • the outer surface of the tubular extension 8 is cylindrical while the inner surface of the wall 9 comprises a cylindrical part extended tangentially by two flat or slightly curved portions defining a substantially V-shaped section, so that the cavity 10 comprises an annular zone 11 of constant cross section connecting to a second zone 12 forming a housing with a V section.
  • the inner surface of the wall 9 is coated, over a height substantially equal to that of the tubular extension 8, with an electrically resistive track 13 with which, in the assembled position of the potentiometer, the friction brush 3 is in contact.
  • the track is connected to the conductors (not shown) for connection to a source of electrical power.
  • stops 14 and 15 project into the housing 12 from the bottom 6 of the body 1. These stops, the role of which will be explained below, are arranged on either side of a plane passing through the axis of the hole 7 and through the bottom of the housing 12 and which constitutes for the body 1 a plane of symmetry, the trace of which is represented by line 2-2 in FIG. 3.
  • the rotor 2 which has, like the body 1, a plane of axial symmetry and is preferably made of the same material as this, comprises a head 16 from which protrude in the same direction an axis 17 intended to be received at rotation in the hole 7 forming a bearing surface and a skirt portion 18 in the form of a cylindrical sector.
  • the axis 17 and the skirt portion 18 delimit between them an annular space in which, in the assembled position of the potentiometer, penetrate the tubular extension 8 and the spring 5a.
  • the skirt portion 18 has two lateral end edges 19 and 20 which act as abutments, explained below.
  • the mop 3 is fixed on the skirt portion 18, in the vicinity of the edge 19 or of the edge 20 depending on whether it is one or the other of the versions of the potentiometer, that is to say at recall in the direct direction or in the indirect direction. Thanks to its symmetry with respect to a longitudinal plane, the same brush 3 can be used in both cases.
  • This brush 3 is connected to an output terminal by conventional means not shown.
  • the helical spring 5a has at its opposite ends locking tabs 21a, 22a extending radially in the plane of the turns of the spring.
  • the spring 5a corresponding to the embodiment of FIGS. 1 to 4A is wound so as to exert its restoring force in the direct direction while the spring 5b shown in FIG. 6 and intended to produce the other version of the potentiometer exerts its force reminder in the indirect direction.
  • the lever 4 also has a longitudinal plane of symmetry so that it can be used interchangeably with either version of the potentiometer and can advantageously be made of cut and folded sheet metal. It has at one of its ends a suitable assembly means 24 making it possible to secure it to the free end of the axis 17 of the rotor 2, and at its other end two curved lateral tabs 23a and 23b arranged symmetrically on either side of a longitudinal tab 25 folded between the two lateral tabs.
  • This lever is more particularly intended to allow the use of the potentiometer as a sensor of the angular position of a butterfly whose control lever comes to bear against the convex outer surface of one or the other of the lateral tongues 23a and 23b according to the version considered, the longitudinal tongue 25 making it possible to prevent contact with the control lever being made between the lateral tongues.
  • the spring 5a is placed in the body 1, around the tubular extension 7, by engaging one of its locking tabs 21a between the stops 14 and 15 ( Figure 3).
  • the rotor 2 is then presented, equipped with a brush 3 fixed on the appropriate side on the skirt portion 18, so as to engage the axis 17 in the hole 7.
  • This operation is carried out in a relative angular position of the body 1 and of the rotor 2 such that the wiper 3 is located directly above the housing 12, insertion position in which the planes of axial symmetry of the body 1 and of the rotor 2 are substantially coincident.
  • the profile of the housing 12, considered in cross section, is such that, in this position, it allows the elastic friction brush 3 to penetrate therein freely, without prestressing the latter and without contact with the track 13 coating the inner surface of the wall 9.
  • the rotor 2 can then be more fully engaged in the body 1, until the lower edge of the skirt portion 18 comes to bear against the upper edge of the stops 14 and 15, in the position shown in FIGS. 2 and 4.
  • the rotor 2 is then rotated in the indirect direction represented by the arrow F in FIG. 4A until, at first, the lateral edge 20 of the skirt portion 18 comes into contact with the other locking tab 22a of the spring, then pushes it by gradually applying a preload to the spring 5a.
  • the elastic friction brush 3 passes from the housing 12 to the annular zone 11 and is applied elastically against the potentiometric track 13 according to a friction mode similar to that of use.
  • the aforementioned rotational movement of the rotor 2 is continued until the skirt portion 18 completely releases the stop 15: the rotor can then be pushed into the body 1 until the lower edge of the skirt portion 18 either in contact with the bottom of the cavity 10, then released.
  • the rotor 2 is then retained in the body 1 thanks to the preload of the spring 5a which, by its tab 22a applied against the lateral edge 20, urges the other lateral edge 19 of the skirt portion 18 against the stop 15, which corresponds to the rest position of the potentiometer.
  • the assembly of the latter can be completed by mounting the lever 4 on the end of the axis 17 which protrudes from the body 1 and by fixing a cover (not shown) on the latter to enclose the rotor 2 and spring 5A.
  • the potentiometer described therefore makes it possible to dispense with the use of any additional tool for the installation of the brush and ensures the contact of the latter with the potentiometric track according to a favorable angle of attack whatever the version.
  • the potentiometer track brush connection is particularly delicate, the potentiometer described combines simplicity and quality of assembly, which can be easily automated.
  • the two versions of the potentiometer according to the direction of return of the rotor, can be produced with common parts with the exception of the single spring.
  • the invention is not limited to the embodiments described and many modifications can be made without departing from its scope.
  • the housing 12 could be made in the form of two separate grooves symmetrical with respect to the plane of symmetry of the body, or that the shape of the stops, of the skirt portion, etc. could be different while playing the same role.
  • hole 7 and the axis 17 each have two zones of different diameters connected by a shoulder and which guide the axis 17 of the rotor in the body 1 according to a double bearing.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Adjustable Resistors (AREA)

Abstract

A stationary case has a resistive track. An elastic wiper is carried by a rotor mounted to rotate in the case and able, during operation, to rub against the resistive track, and a spring is placed between the stationary case and the rotor to pull the rotor to a rest position. The case provides at least one housing able to receive the wiper without initial stress or deformation in an initial position of introduction of the rotor in the case and to allow the wiper to come in contact with the track during mounting of the rotor in the case by rotation of said rotor between its introduction position and its rest position. Application is to measuring the angular position of the throttle valve of an internal combustion engine.

Description

L'invention concerne un potentiomètre rotatif, notamment pour la mesure de la position angulaire d'un organe rotatif tel que le papillon des gaz d'un moteur à combustion interne.The invention relates to a rotary potentiometer, in particular for measuring the angular position of a rotary member such as the throttle valve of an internal combustion engine.

On connaît des potentiomètres rotatifs du type comprenant un corps fixe pourvu intérieurement d'une piste résistive contre laquelle est appliqué un balai frotteur porté par un rotor monté dans le corps et sollicité par un ressort hélicoïdal dans une position de repos définie par la venue en appui d'une partie du rotor contre une butée du corps.Known rotary potentiometers of the type comprising a fixed body provided internally with a resistive track against which is applied a friction brush carried by a rotor mounted in the body and biased by a helical spring in a rest position defined by the coming into abutment of a part of the rotor against a stop of the body.

La rotation du rotor permet de faire varier la résistance interne du potentiomètre de sorte que le rapport entre les tensions de sortie et d'entrée du potentiomètre est représentatif de l'angle de rotation du rotor par rapport à sa position de repos. La mesure de ce rapport peut donc être utilisée dans un capteur potentiométrique pour caractériser la position angulaire d'un organe rotatif par rapport à un repère fixe.Rotation of the rotor makes it possible to vary the internal resistance of the potentiometer so that the ratio between the output and input voltages of the potentiometer is representative of the angle of rotation of the rotor relative to its rest position. The measurement of this ratio can therefore be used in a potentiometric sensor to characterize the angular position of a rotary member with respect to a fixed reference.

Dans les potentiomètres de ce type, lors du montage du rotor dans le corps, il faut éviter tout contact entre le balai frotteur et la piste résistive pour éviter leur détérioration. Cette opération est donc délicate et nécessite dans l'état actuel de la technique d'utiliser un outil supplémentaire pour plaquer le balai contre le rotor lors du positionnement de celui-ci dans le corps.In potentiometers of this type, when mounting the rotor in the body, any contact between the friction brush and the resistive track must be avoided to avoid their deterioration. This operation is therefore delicate and requires in the current state of the art to use an additional tool to press the brush against the rotor when positioning the latter in the body.

L'invention vise à fournir un potentiomètre du type précité qui soit d'une construction particulièrement simple tout en permettant de remédier aux inconvénients des potentiomètres de la technique antérieure, notamment d'éviter le recours à un outil supplémentaire pour l'introduction du balai dans le corps.The invention aims to provide a potentiometer of the aforementioned type which is of a particularly simple construction while making it possible to remedy the drawbacks of potentiometers of the prior art, in particular to avoid the use of an additional tool for the introduction of the brush into the body.

A cet effet, l'invenion a pour object un potentiomètre rotatif comprénant un corps fixe présentant une piste résistive, un balai élastique porté par un rotor monté à rotation dans le corps et adapté, en fonctionnement, pour frotter contre la piste résistive, et un ressort interposé entre le corps fixe et le rotor pour solliciter ce dernier vers une position de repos, caractérisé en ce que le corps comporte au moins un logement apte à recevoir le balai sans précontrainte ni déformation dans une position initiale d'introduction du rotor dans le corps et à autoriser la venue en contact du balai avec la piste lors du montage du rotor dans le corps par rotation dudit rotor entre sa position d'introduction et sa position de repos.To this end, the object of the invention is a rotary potentiometer comprising a fixed body having a resistive track, an elastic brush carried by a rotor mounted for rotation in the body and adapted, in operation, to rub against the resistive track, and a spring interposed between the fixed body and the rotor to urge the latter towards a rest position, characterized in that the body comprises at least one housing capable of receiving the brush without prestressing or deformation in an initial position for introducing the rotor into the body and to allow the brush to come into contact with the track when the rotor is mounted in the body by rotation of said rotor between its insertion position and its rest position.

Par ailleurs, les potentiomètres connus du type précité n'offrent pas la possibilité d'obtenir avec le même corps et le même rotor un rappel du rotor vers sa position de repos indifféremment dans le sens direct ou dans le sens indirect. En effet, lorsqu'un tel potentiomètre est destiné par exemple à mesurer la position angulaire du papillon des gaz d'un moteur à combustion interne, son utilisation rationnelle nécessite d'avoir un même sens de rappel du rotor et du papillon sous l'action de leur ressort de rappel respectif. Dans ce cas, le rotor est entraîné par l'axe du papillon lors de l'augmentation de charge du moteur et n'entrave pas le retour du papillon vers la position «pied levé». Dans le cas d'un sens de rappel opposé, le rotor suivrait le papillon pendant l'augmentation de charge mais pourrait bloquer son retour vers la position «pied levé».Furthermore, the known potentiometers of the aforementioned type do not offer the possibility of obtaining with the same body and the same rotor a return of the rotor to its rest position either in the direct direction or in the indirect direction. Indeed, when such a potentiometer is intended for example to measure the angular position of the throttle valve of an internal combustion engine, its rational use requires having the same direction of return of the rotor and the throttle valve under the action their respective return spring. In this case, the rotor is driven by the throttle axis when the engine load increases and does not hinder the return of the throttle to the "lifted" position. In the case of an opposite return direction, the rotor would follow the throttle during the load increase, but could block its return to the "raised foot" position.

Cette possibilité d'incident justifie la réalisation de deux versions de potentiomètre satisfaisant toutes les configurations possibles tout en présentant un maximum de pièces communes pour des raisons d'économie tant au niveau de la fabrication que du stockage.This possibility of an incident justifies the production of two versions of potentiometer satisfying all possible configurations while presenting a maximum of common parts for reasons of economy both in terms of manufacturing and storage.

Selon un mode particulier de realisation, l'invention permet d'atteindre ce but au moyen d'un potentiomètre tel que défini ci-dessus, caractérisé en ce que le corps et le rotor présentent un plan axial de symétrie permettant leur assemblage sélectivement avec l'un ou l'autre de deux types de ressort dont l'un rappelle le rotor dans le sens direct et l'autre dans le sens indirect et en ce que le rotor possède deux zones pour la fixation du balai en l'une ou l'autre de deux positions symétriques par rapport à ce plan, suivant le sens de rappel du ressort.According to a particular embodiment, the invention achieves this goal by means of a potentiometer as defined above, characterized in that the body and the rotor have an axial plane of symmetry allowing their selective assembly with the either of two types of spring, one of which recalls the rotor in the direct direction and the other in the indirect direction and in that the rotor has two zones for fixing the brush in one or the other. 'other of two symmetrical positions relative to this plane, according to the return direction of the spring.

Enfin, dans les potentiomètres connus du type précité, le ressort de rappel hélicoïdal a généralement l'une de ces pattes de fixation parallèle à l'axe du ressort et l'autre dans le plan de ses spires. Un trou dans le corps du potentiomètre accueille la première patte alors que la seconde se trouve bloquée par une butée sur le rotor. L'inconvénient d'un tel agencement est que la fixation du ressort dans le corps nécessite beaucoup de dextérité et proscrit tout système de montage automatique.Finally, in known potentiometers of the aforementioned type, the helical return spring generally has one of these fixing lugs parallel to the axis of the spring and the other in the plane of its turns. A hole in the body of the potentiometer receives the first tab while the second is blocked by a stop on the rotor. The disadvantage of such an arrangement is that fixing the spring in the body requires a lot of dexterity and proscribes any automatic mounting system.

Suivant un autre mode particulier de réalisation de l'invention, ce problème est résolu grâce au fait que le ressort est un ressort hélicoïdal présentant à ses extrémités des pattes de blocage s'étendant radialement dans le plan des spires du ressort et dont l'une est apte à être engagée axialement dans des moyens d'immobilisation ménagés dans le corps et l'autre à prendre appui contre une première surface de butée du rotor.According to another particular embodiment of the invention, this problem is solved by the fact that the spring is a helical spring having at its ends locking tabs extending radially in the plane of the turns of the spring and one of which is adapted to be engaged axially in immobilization means provided in the body and the other to bear against a first abutment surface of the rotor.

D'autres caractéristiques et avantages de l'invention apparaîtront au cours de la description qui va suivre d'un mode de sa réalisation donné uniquement à titre d'exemple et illustré par les dessins annexés sur lesquels:

  • - la figure 1 est une vue en perspective éclatée, avec arrachement partiel, du rotor et du corps d'un potentiomètre conforme à l'invention;
  • - la figure 2 est une vue en coupe suivant la ligne 2-2 de la figure 3 du potentiomètre représenté pendant une phase intermédiaire de son assemblage;
  • - la figure 3 est une vue en coupe suivant la ligne 3-3 de la figure 2;
  • - la figure 4 est une vue en coupe suivant la ligne 4-4 de la figure 2;
  • - la figure 4A est une vue en coupe analogue à la figure 4 représentant le potentiomètre après assemblage définitif;
  • - la figure 5 est une vue en plan d'un levier d'entraînement du rotor; et
  • - la figure 6 est une vue en plan d'une variante de ressort permettant le rappel du rotor dans le sens opposé à celui du mode de réalisation des figures 1 à 4A.
Other characteristics and advantages of the invention will appear during the following description of an embodiment given only by way of example and illustrated by the appended drawings in which:
  • - Figure 1 is an exploded perspective view, partially broken away, of the rotor and the body of a potentiometer according to the invention;
  • - Figure 2 is a sectional view along line 2-2 of Figure 3 of the potentiometer shown during an intermediate phase of its assembly;
  • - Figure 3 is a sectional view along line 3-3 of Figure 2;
  • - Figure 4 is a sectional view along line 4-4 of Figure 2;
  • - Figure 4A is a sectional view similar to Figure 4 showing the potentiometer after final assembly;
  • - Figure 5 is a plan view of a rotor drive lever; and
  • - Figure 6 is a plan view of a spring variant allowing the return of the rotor in the opposite direction to that of the embodiment of Figures 1 to 4A.

En se reportant aux figures 1 à 5, le potentiomètre représenté comprend essentiellement un corps 1 dans lequel un rotor 2 portant un balai frotteur électriquement conducteur 3 et un levier d'actionnement 4 est sollicité vers sa position de repos par un ressort hélicoïdal 5a.Referring to FIGS. 1 to 5, the potentiometer shown essentially comprises a body 1 in which a rotor 2 carrying an electric friction brush only conductor 3 and an actuating lever 4 is biased towards its rest position by a helical spring 5a.

Le corps 1 présente sensiblement la forme d'une cuvette, par exemple en matière plastique moulée, dont le fond 6 est percé d'un trou 7 également délimité par un prolongement tubulaire 8 faisant saillie depuis le fond 6 de la cuvette. Le prolongement tubulaire 8, de hauteur inférieure à la paroi périphérique 9 de la cuvette, délimite avec celle-ci et le fond 6 une cavité 10. La surface extérieure du prolongement tubulaire 8 est cylindrique tandis que la surface intérieure de la paroi 9 comprend une partie cylindrique prolongée tangentiellement par deux portions planes ou faiblement incurvées définissant une section sensiblement en forme de V, de sorte que la cavité 10 comprend une zone annulaire 11 de section constante se raccordant à une deuxième zone 12 formant un logement à section en V.The body 1 has substantially the shape of a bowl, for example of molded plastic, the bottom 6 of which is pierced with a hole 7 also delimited by a tubular extension 8 projecting from the bottom 6 of the bowl. The tubular extension 8, of height less than the peripheral wall 9 of the bowl, defines with the latter and the bottom 6 a cavity 10. The outer surface of the tubular extension 8 is cylindrical while the inner surface of the wall 9 comprises a cylindrical part extended tangentially by two flat or slightly curved portions defining a substantially V-shaped section, so that the cavity 10 comprises an annular zone 11 of constant cross section connecting to a second zone 12 forming a housing with a V section.

La surface intérieure de la paroi 9 est revêtue, sur une hauteur sensiblement égale à celle du prolongement tubulaire 8, d'une piste électriquement résistive 13 avec laquelle, en position assemblée du potentiomètre, le balai frotteur 3 est en contact. A ses extrémités voisines du fond du logement 12, la piste est connectée è des conducteurs (non représentés) de raccordement à une source d'alimentation électrique.The inner surface of the wall 9 is coated, over a height substantially equal to that of the tubular extension 8, with an electrically resistive track 13 with which, in the assembled position of the potentiometer, the friction brush 3 is in contact. At its ends close to the bottom of the housing 12, the track is connected to the conductors (not shown) for connection to a source of electrical power.

Enfin, deux butées 14 et 15 font saillie dans le logement 12 depuis le fond 6 du corps 1. Ces butées, dont le rôle sera expliqué ci-après, sont disposées de part et d'autre d'un plan passant par l'axe du trou 7 et par le fond du logement 12 et qui constitue pour le corps 1 un plan de symétrie dont la trace est représentée par la ligne 2-2 de la figure 3.Finally, two stops 14 and 15 project into the housing 12 from the bottom 6 of the body 1. These stops, the role of which will be explained below, are arranged on either side of a plane passing through the axis of the hole 7 and through the bottom of the housing 12 and which constitutes for the body 1 a plane of symmetry, the trace of which is represented by line 2-2 in FIG. 3.

Le rotor 2, qui présente comme le corps 1 un plan de symétrie axial et est de préférence réalisé dans le même materiau que celui-ci, comprend une tête 16 à partir de laquelle fontsaillie dans le même sens un axe 17 destiné à être reçu à rotation dans le trou 7 formant portée et une portion de jupe 18 en forme de secteur cylindrique. Laxe 17 et la portion de jupe 18 délimitent entre eux un espace annulaire dans lequel, en position assemblée du potentiomètre, pénètrent le prolongement tubulaire 8 et le ressort 5a. La portion de jupe 18 présente deux bords latéraux d'extrémité 19 et 20 qui jouent un rôle de butée explicité ci-après.The rotor 2, which has, like the body 1, a plane of axial symmetry and is preferably made of the same material as this, comprises a head 16 from which protrude in the same direction an axis 17 intended to be received at rotation in the hole 7 forming a bearing surface and a skirt portion 18 in the form of a cylindrical sector. The axis 17 and the skirt portion 18 delimit between them an annular space in which, in the assembled position of the potentiometer, penetrate the tubular extension 8 and the spring 5a. The skirt portion 18 has two lateral end edges 19 and 20 which act as abutments, explained below.

Le balai frotteur 3 est fixé sur la portion de jupe 18, au voisinage du bord 19 ou du bord 20 suivant qu'il s'agit de l'une ou l'autre des versions du potentiomètre, c'est-à-dire à rappel dans le sens direct ou dans le sens indirect. Grâce à sa symétrie par rapport à un plan longitudinal, le même balai 3 peut être utilisé dans les deux cas. Ce balai 3 est connecté à une borne de sortie par des moyens conventionnels non représentés.The mop 3 is fixed on the skirt portion 18, in the vicinity of the edge 19 or of the edge 20 depending on whether it is one or the other of the versions of the potentiometer, that is to say at recall in the direct direction or in the indirect direction. Thanks to its symmetry with respect to a longitudinal plane, the same brush 3 can be used in both cases. This brush 3 is connected to an output terminal by conventional means not shown.

Le ressort hélicoïdal 5a présente à ses extrémités opposées des pattes de blocage 21 a, 22a s'étendant radialement dans le plan des spires du ressort.The helical spring 5a has at its opposite ends locking tabs 21a, 22a extending radially in the plane of the turns of the spring.

Le ressort 5a correspondant au mode de réalisation des figures 1 à 4A est bobiné de manière à exercer sa force de rappel dans le sens direct tandis que le ressort 5b représenté à la figure 6 et destiné à réaliser l'autre version du potentiomètre exerce sa force de rappel dans le sens indirect.The spring 5a corresponding to the embodiment of FIGS. 1 to 4A is wound so as to exert its restoring force in the direct direction while the spring 5b shown in FIG. 6 and intended to produce the other version of the potentiometer exerts its force reminder in the indirect direction.

Enfin, le levier 4 présente également un plan de symétrie longitudinal pour pouvoir être utilisé indifféremment avec l'une ou l'autre version du potentiomètre et peut être avantageusement réalisé en tôle découpée et pliée. Il comporte à l'une de ses extremi- tés un moyen d'assemblage 24 adéquat permettant d'assurer sa fixation sur l'extrémité libre de l'axe 17 du rotor 2, et à son autre extrémité deux languettes latérales bombées 23a et 23b disposées symétriquement de part et d'autre d'une languette longitudinale 25 repliée entre les deux languettes latérales. Ce levier est plus particulièrement destiné à permettre l'utilisation du potentiomètre comme capteur de la position angulaire d'un papillon dont le levier de commande vient prendre appui contre la surface extérieure convexe de l'une ou l'autre des languettes latérales 23a et 23b suivant la version considérée, la languette longitudinale 25 permettant d'éviter que le contact avec le levier de commande se fasse entre les languettes latérales.Finally, the lever 4 also has a longitudinal plane of symmetry so that it can be used interchangeably with either version of the potentiometer and can advantageously be made of cut and folded sheet metal. It has at one of its ends a suitable assembly means 24 making it possible to secure it to the free end of the axis 17 of the rotor 2, and at its other end two curved lateral tabs 23a and 23b arranged symmetrically on either side of a longitudinal tab 25 folded between the two lateral tabs. This lever is more particularly intended to allow the use of the potentiometer as a sensor of the angular position of a butterfly whose control lever comes to bear against the convex outer surface of one or the other of the lateral tongues 23a and 23b according to the version considered, the longitudinal tongue 25 making it possible to prevent contact with the control lever being made between the lateral tongues.

On décrira maintenant le montage du potentiomètre à rappel dans le sens direct correspondant au mode de réalisation des figures 1 à 4A.We will now describe the mounting of the return potentiometer in the direct direction corresponding to the embodiment of Figures 1 to 4A.

En premier lieu, on vient placer le ressort 5a dans le corps 1, autour du prolongement tubulaire 7, en engageant l'une de ses pattes de blocage 21 a entre les butées 14 et 15 (figure 3). On présente ensuite le rotor 2, équipé d'un balai 3 fixé du côté approprié sur la portion de jupe 18, de manière à engager l'axe 17 dans le trou 7. On effectue cette opération dans une position angulaire relative du corps 1 et du rotor 2 telle que le balai frotteur 3 se trouve à l'aplomb du logement 12, position d'introduction dans laquelle les plans de symétrie axiale du corps 1 et du rotor 2 sont sensiblement en coïncidence. Le profil du logement 12, considéré en coupe transversale, est tel que, dans cette position, il permet au balai frotteur élastique 3 d'y pénétrer librement, sans précontrainte de ce dernier et sans contact avec la piste 13 revêtant la surface intérieure de la paroi 9.Firstly, the spring 5a is placed in the body 1, around the tubular extension 7, by engaging one of its locking tabs 21a between the stops 14 and 15 (Figure 3). The rotor 2 is then presented, equipped with a brush 3 fixed on the appropriate side on the skirt portion 18, so as to engage the axis 17 in the hole 7. This operation is carried out in a relative angular position of the body 1 and of the rotor 2 such that the wiper 3 is located directly above the housing 12, insertion position in which the planes of axial symmetry of the body 1 and of the rotor 2 are substantially coincident. The profile of the housing 12, considered in cross section, is such that, in this position, it allows the elastic friction brush 3 to penetrate therein freely, without prestressing the latter and without contact with the track 13 coating the inner surface of the wall 9.

Le rotor 2 peut alors être engagé plus à fond dans le corps 1, jusqu'à ce que le bord inférieur de la portion de jupe 18 vienne en appui contre le bord supérieur des butées 14 et 15, dans la position représentée aux figures 2 et 4.The rotor 2 can then be more fully engaged in the body 1, until the lower edge of the skirt portion 18 comes to bear against the upper edge of the stops 14 and 15, in the position shown in FIGS. 2 and 4.

Le rotor 2 est ensuite tourné dans le sens indirect représenté par la flèche F à la figure 4A jusqu'à ce que, dans un premier temps, le bord latéral 20 de la portion de jupe 18 vienne en contact avec l'autre patte de blocage 22a du ressort, puis repousse celle-ci en appliquant progressivement une précontrainte au ressort 5a. Au cours de cette rotation, le balai frotteur élastique 3 passe du logement 12 à la zone annulaire 11 et vient s'appliquer élastiquement contre la piste potentiométrique 13 suivant un mode de frottement analogue à celui d'utilisation. Le mouvement de rotation précité du rotor 2 est poursuivi jusqu'au moment où la portion de jupe 18 dégage complètement la butée 15: le rotor peut alors être enfoncé dans le corps 1 jusqu'a ce que le bord inférieur de la portion de jupe 18 soit en contact avec le fond de la cavité 10, puis libéré. Le rotor 2 est alors retenu dans le corps 1 grâce à la précontrainte du ressort 5a qui, par sa patte 22a appliquée contre le bord latéral 20, sollicite l'autre bord latéral 19 de la portion de jupe 18 contre la butée 15, ce qui correspond à la position de repos du potentiomètre.The rotor 2 is then rotated in the indirect direction represented by the arrow F in FIG. 4A until, at first, the lateral edge 20 of the skirt portion 18 comes into contact with the other locking tab 22a of the spring, then pushes it by gradually applying a preload to the spring 5a. During this rotation, the elastic friction brush 3 passes from the housing 12 to the annular zone 11 and is applied elastically against the potentiometric track 13 according to a friction mode similar to that of use. The aforementioned rotational movement of the rotor 2 is continued until the skirt portion 18 completely releases the stop 15: the rotor can then be pushed into the body 1 until the lower edge of the skirt portion 18 either in contact with the bottom of the cavity 10, then released. The rotor 2 is then retained in the body 1 thanks to the preload of the spring 5a which, by its tab 22a applied against the lateral edge 20, urges the other lateral edge 19 of the skirt portion 18 against the stop 15, which corresponds to the rest position of the potentiometer.

L'assemblage de ce dernier peut être complété par le montage du levier 4 sur l'extrémité de l'axe 17 qui fait saillie hors du corps 1 et par la fixation d'un couvercle (non représenté) sur ce dernier pour y enfermer le rotor 2 et le ressort 5A.The assembly of the latter can be completed by mounting the lever 4 on the end of the axis 17 which protrudes from the body 1 and by fixing a cover (not shown) on the latter to enclose the rotor 2 and spring 5A.

Pour la réalisation d'un potentiomètre à rappel dans le sens indirect, seules diffèrent la fixation du balai 3 sur le rotor 2 et la forme du ressort. On utilise alors le ressort 5b qui est symétrique du ressort 5A par rapport à un plan axial passant par l'une des pattes de fixation et on monte le balai 3 sur le rotor dans une position symétrique, par rapport au plan de symétrie axial du rotor, de celle représentée par exemple à la figure 4.For the production of a return potentiometer in the indirect direction, only the attachment of the brush 3 to the rotor 2 differs and the shape of the spring. Spring 5b is then used which is symmetrical with spring 5A with respect to an axial plane passing through one of the fixing lugs and the brush 3 is mounted on the rotor in a symmetrical position, with respect to the axial plane of symmetry of the rotor. , from that shown for example in FIG. 4.

Le potentiomètre décrit permet donc de s'affranchir de l'utilisation de tout outil supplémentaire pour la mise en place du balai et assure le contact de ce dernier avec la piste potentiométrique selon un angle d'attaque favorable quelque soit la version. La liasion balai piste potentiométrique étant particulièrement délicate, le potentiomètre décrit associe la simplicité et la qualité du montage, qui peut être aisément automatisé.The potentiometer described therefore makes it possible to dispense with the use of any additional tool for the installation of the brush and ensures the contact of the latter with the potentiometric track according to a favorable angle of attack whatever the version. As the potentiometer track brush connection is particularly delicate, the potentiometer described combines simplicity and quality of assembly, which can be easily automated.

En outre, les deux versions du potentiomètre, suivant le sens de rappel du rotor, peuvent être réalisées avec des pièces communes à l'exception du seul ressort.In addition, the two versions of the potentiometer, according to the direction of return of the rotor, can be produced with common parts with the exception of the single spring.

Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits et de nombreuses modifications peuvent y être apportées sans sortir de son cadre. C'est ainsi, par exemple, que le logement 12 pourrait être réalisé sous la forme de deux gorges distinctes symétriques par rapport au plan de symétrie du corps, ou que la forme des butées, de la portion de jupe, etc. pourrait être différente tout en jouant le même rôle.Of course, the invention is not limited to the embodiments described and many modifications can be made without departing from its scope. Thus, for example, that the housing 12 could be made in the form of two separate grooves symmetrical with respect to the plane of symmetry of the body, or that the shape of the stops, of the skirt portion, etc. could be different while playing the same role.

On remarquera enfin que le trou 7 et l'axe 17 présentent chacun deux zones de diamètres différents raccordées par un épaulement et qui assurent le guidage de l'axe 17 du rotor dans le corps 1 suivant un double palier.Finally, note that the hole 7 and the axis 17 each have two zones of different diameters connected by a shoulder and which guide the axis 17 of the rotor in the body 1 according to a double bearing.

Claims (9)

1. Rotary potentiometer comprising a fixed body having a resistive track, an elastic brush carried by a rotor which is mounted rotatably in the body and which is designed, during operation, to rub against the resistive track, and a spring interposed between the fixed body and the rotor in order to stress the latter towards a rest position, characterized in that the body (1) has at least one receptacle (12) intended for receiving the brush (3), without prestress or deformation, in an initial position for introducing the rotor (2) of the body (1), and for allowing the brush (3) to come in contact with the track (13), during the assembly of the rotor in the body, as a result of the rotation of the said rotor (2) between its introduction position and its rest position.
2. Potentiometer according to Claim 1, characterized in that the body (1) and the rotor (2) have an axial plane of symmetry making it possible to assemble them selectively with either one of two types of spring (5a, 5b), of which one (5a) returns the rotor (2) directly and the other (5b) indirectly, and in that the rotor (2) has two zones for fastening the brush (3) in either one of two positions symmetrical relative to this plane, in the return direction of the spring.
3. Potentiometer according to either of Claims 1 and 2, characterized in that the spring is a helical spring (5a; 5b) having, at its ends, retaining lugs (21a, 22a; 21b, 22b) which extend radially in the plane of the turns of the spring and of which one (21 a; 21 b) is intended to be engaged axially in immobilizing means (14, 15) made in the body (1) and the other (22a; 22b) to bear against a first stop surface (19, 20) of the rotor (2).
4. Potentiometer according to Claim 3, characterized in that the body (1) has the form of a bowl, the bottom (6) of which is perforated with a hole (7) likewise delimited by a tubular extension (8) forming, with the peripheral wall (9) of the bowl, a cavity (10) comprising an annular zone (11) of constant cross- section, in which the brush (3) is elastically up againstthetrack (13), and a second zone forming the said receptacle (12).
5. Potentiometer according to Claim 4, characterized in that the rotor (2) comprises an axle (17) received rotatably in the said hole (7) and ending in a head (16) having at least one appendage (18) delimiting the said first stop surface (19, 20) and a second stop surface (20, 19) which, in the rest position, is designed to bear against stop means (14, 15) made in the body (1).
6. Potentiometer according to Claim 5, characterized in that the said appendage is a skirt portion (18) which carries the brush (3) and which, with the axle (17), delimits an annular space, into which the tubular extension (8) and the spring (5a; 5b) penetrate and the lateral edges (19, 20) of which form the first and second stop surfaces.
7. Potentiometer according to Claim 5, when it is dependent on Claim 2, characterized in that the means for immobilizing the spring and for stopping the rotor consist of two stops (14, 15) which project from the bottom of the cavity (10) on either side of the said plane of symmetry and between which the said retaining lug (21 a, 21 b) of the spring (5a, 5b) is immobilized, the said stops, (15, 14) interacting selectively with either one of the said stop surfaces (19, 20), depending on the return direction of the spring (5a, 5b).
8. Potentiometer according to any of Claims 1 to 7, characterized in that it possesses a lever (4) for actuating the rotor (2), having, on either side of a longitudinal plane of symmetry, two convex lateral bearing tongues (23a, 23b), between which a longitudinal tongue (25) is bent.
9. Potentiometer according to any of Claims 1 to 8, characterized in that the axle (17) of the rotor is guided in the body (1) by means of a double bearing.
EP85400363A 1984-02-28 1985-02-27 Rotating potentiometer, particularly for angular position measurement Expired EP0157666B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85400363T ATE31839T1 (en) 1984-02-28 1985-02-27 ROTATION POTENTIOMETER, ESPECIALLY FOR ANGULAR POSITION MEASUREMENT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8403006 1984-02-28
FR8403006A FR2560428B1 (en) 1984-02-28 1984-02-28 ROTARY POTENTIOMETER IN PARTICULAR FOR ANGULAR POSITION MEASUREMENT

Publications (2)

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EP0157666A1 EP0157666A1 (en) 1985-10-09
EP0157666B1 true EP0157666B1 (en) 1988-01-07

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EP85400363A Expired EP0157666B1 (en) 1984-02-28 1985-02-27 Rotating potentiometer, particularly for angular position measurement

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US (1) US4621250A (en)
EP (1) EP0157666B1 (en)
AT (1) ATE31839T1 (en)
DE (1) DE3561371D1 (en)
FR (1) FR2560428B1 (en)

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Also Published As

Publication number Publication date
US4621250A (en) 1986-11-04
ATE31839T1 (en) 1988-01-15
FR2560428B1 (en) 1987-02-27
EP0157666A1 (en) 1985-10-09
DE3561371D1 (en) 1988-02-11
FR2560428A1 (en) 1985-08-30

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