EP2302468B1 - Coupling device - Google Patents

Coupling device Download PDF

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Publication number
EP2302468B1
EP2302468B1 EP10176506A EP10176506A EP2302468B1 EP 2302468 B1 EP2302468 B1 EP 2302468B1 EP 10176506 A EP10176506 A EP 10176506A EP 10176506 A EP10176506 A EP 10176506A EP 2302468 B1 EP2302468 B1 EP 2302468B1
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EP
European Patent Office
Prior art keywords
rotor
gear
teeth
spline
reducer
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EP10176506A
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German (de)
French (fr)
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EP2302468A1 (en
Inventor
Alain Laager
Hoang-Khanh Bui
Jean-François Mojou
Patrice Parietti
Michaël Zwahlen
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MPS Micro Precision Systems AG
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MPS Micro Precision Systems AG
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Publication of EP2302468A1 publication Critical patent/EP2302468A1/en
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B5/00—Automatic winding up
    • G04B5/02—Automatic winding up by self-winding caused by the movement of the watch
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B13/00—Gearwork
    • G04B13/005—Gearwork where a revolution in both directions is changed into a revolution in one direction

Definitions

  • the present invention relates to a coupling device, of the type used in automatic windings of wristwatches and, more particularly, to a coupling device transmitting the winding force from the oscillating mass to the ratchet.
  • the self-winding watches of known type generally comprise a gear train having the function of transmitting the movement of the oscillating mass to the ratchet wheel, possibly by straightening the direction of rotation, and at the same time reducing the speed of the oscillating mass and to increase the force intended to arm the mainspring.
  • a large gear ratio is required in order to overcome the elastic reaction force of the spring.
  • the transmission of an automatic winding mechanism generally has a reduction ratio of 100 or more.
  • the coupling device used for the automatic winding of a watch shall include elements to transform the two-way movement of the oscillating mass into one-way movement only.
  • the device includes a one-way clutch, so that the oscillating weight rotates freely in one direction and, in the other direction, drives the transmission system that arms the barrel spring.
  • the Swiss patent CH694025 discloses a coupling device with two superposed coaxial unidirectional clutches, in which the barrel spring is armed whatever the direction of rotation of the oscillating mass.
  • the document EP1046965 discloses a self-winding watch comprising an oscillating winding mass through a large diameter ball bearing, and reduction mobiles.
  • the use of a planetary gear in the center of the bearing imposes a large diameter ball bearing, and limits the reduction ratio possible.
  • the document GB2043826 discloses a unidirectional transmission device comprising a deformable ring. This device is practically impossible to miniaturize in the dimensions necessary for watchmaking. Furthermore, the deformable ring is toothless and acts by friction, so that the reduction ratio is variable; such a device is unsuitable for horological applications which require, on the contrary, precisely defined reduction ratios.
  • An object of the present invention is to provide a coupling device that can be used for the automatic winding of a wristwatch free of the limitations of known devices and, in particular, a unidirectional coupling device with an integrated reducing gear occupying as small a volume as possible and with high efficiency.
  • the figure 1 represents, in schematic form, a part of the automatic winding device of a wristwatch comprising a coupling device according to one aspect of the invention.
  • An oscillating mass 30 is fixed on a rotor 39, which is arranged on a ball bearing (not visible in this figure), so as to be rotatable about a central axis relative to the automatic bridge 21 acting as a support.
  • the rotor 39 is the input member of the coupling device of the invention 10, which has the function of converting the alternating movement of the oscillating mass 30 into unidirectional movement, and to provide a sufficient gear ratio.
  • the adoption of a harmonic reduction gear allows the realization of a coupling device 10 with an extremely small volume, as will be seen later.
  • the constituent elements of the coupling device 10 of the figure 1 are better visible in the cut of the figure 2 .
  • the rotor 39 consists of a ferrule connected, at its external diameter, to the automatic bridge 21 by the optional external ball bearing 35, so as to be able to rotate without friction with respect to the support 21.
  • the ball bearing comprises steel balls or, preferably, ceramic balls free of lubrication, for example ceramic zirconium oxide beads.
  • the oscillating mass 30 is riveted, or secured with any suitable method, to the side surface of the rotor 39, so that the rotor 39 is driven in both directions when wearing the watch.
  • the internal diameter of the rotor 39 is connected, by the unidirectional ball clutch 40, to a reducing device concentrically placed inside the rotor 39.
  • the unidirectional clutch better visible on the figure 3 , has a plurality of balls 42 at the inner circumference of the rotor 39.
  • the regular spacing around the circumference is provided by a cage 49 (also called ball separator), integral in rotation with the ring 50, which is the device input of the reducer.
  • the cage 49 carries housings for the balls 42 with inclined surfaces forming jamming pads, so as to couple the rotor 39 with the ring 50 only for a direction of rotation.
  • the operation and construction of such a unidirectional clutch are described in the patent CH694025 .
  • the coupling device illustrated in the figures allows the winding of the oscillating mass to be reassembled for a single direction of rotation while in the other direction the unidirectional clutch 40 allows the free rotation of the oscillating mass 30.
  • the unidirectional clutch 40 allows the free rotation of the oscillating mass 30.
  • adding a second unidirectional clutch and an inverter to obtain reassembly in both directions, without departing from the scope of the invention.
  • the ring 50 is positioned concentrically inside the rotor 39 and is driven by the unidirectional clutch 40 always in the same direction of rotation.
  • the ring 50 carries, on its inner circumference, two rollers 52 diametrically opposed.
  • Concentrically and inside the ring 50 is placed a deformable ribbon 60 with a smooth outer surface and a toothed internal surface (the toothing of the ribbon 60 is not shown to simplify the figures).
  • the ribbon 60 has for example a pitch diameter between 2 and 5 millimeters, typically of the order of 3 millimeters; the pitch between the teeth on the inner surface is typically between 10 and 100 microns, typically 33 microns. It can be made by molding, laser machining, liga etc in a flexible material such as steel, nickel, an alloy or possibly a synthetic material.
  • the flexible band 60 is circular.
  • the rollers 52 act on two diametrically opposite points of the elastic gear 60, deform and make it assume an oval shape.
  • the rollers 52 push two diametrically opposite points of the elastic band 60 towards the fixed wheel 28 and the central gear 65 which are inside.
  • the elastic ribbon sections between the rollers 52 elastically apart from the inner wheels 28 and 68, so that the engagement between the ribbon 60 and the inner wheels 28 and 68 is limited to the two opposite points of contact with the rollers 52. .
  • the elastic band 60 carries a number N1 of teeth inside.
  • the fixed wheel 28, held stationary by the screw 25 has the same number of teeth N1 of the ribbon.
  • the oval described by the ribbon 60 rotates, and all the teeth of the ribbon 60 meshing successively with the teeth of the fixed wheel 28.
  • the ribbon can not turn because the angular pitch of the fixed wheel 28 and the elastic band 60 are identical.
  • the fixed wheel 28 could be replaced by other devices having the function of preventing the rotation of the elastic band 60 while allowing it to be deformed, for example radial strips connecting the elastic band to the support, or any other equivalent device.
  • the teeth of the ribbon 60 meshes successively with the teeth of the central pinion 65.
  • the central pinion has a number of teeth N2 different from N1. Consequently, the angular pitch of the gear of the central gear is different from that of the gear 60, and the gear 65 is rotated.
  • the teeth N2 of the central gear meshes with the N1 teeth of the ribbon 60 in succession and the pinion thus performs a fraction (N2-N1) / N2 rotation.
  • the central pinion 65 connected to the automatic bridge 21 by the ball bearing 38 and is integral with a toothed output wheel 70, on the same axis. The output wheel 70 rotates in one direction and can raise a mainspring with a single intermediate reduction mobile.
  • harmonic reduction gear (reducer) with rollers 52 resting on the outer surface of the belt allows a particularly compact embodiment.
  • the coupling device of the invention combines, in a reduced volume, substantially integrated in the rolling bearing of the oscillating mass 30, a unidirectional clutch and a gearbox providing a large multiplication of the winding force. It allows to realize a very compact automatic winding mechanism, whose height does not exceed two millimeters, preferably even below the millimeter, which can be easily integrated into wristwatches.
  • the coupling device of the invention makes it possible to add an automatic winding mechanism to a manually wound movement without substantially increasing the thickness of the movement.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Seal Device For Vehicle (AREA)
  • Physical Deposition Of Substances That Are Components Of Semiconductor Devices (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Non-Deflectable Wheels, Steering Of Trailers, Or Other Steering (AREA)
  • Soil Working Implements (AREA)

Abstract

The device (10) has a rotor that is freely turn around an axis relatively to a support (21), and a reducer with an inlet unit driven by the rotor. A one-way clutch (40) is provided between the rotor and the inlet unit. The clutch is arranged in a manner, so that the inlet unit is turned in a single direction irrespective of the rotation direction of the rotor. The inlet unit deforms a toothed flexible band without turning.

Description

Domaine techniqueTechnical area

La présente invention concerne un dispositif d'accouplement, du type de ceux utilisés dans les remontages automatiques des montres bracelet et, plus particulièrement, un dispositif d'accouplement transmettant la force de remontage depuis la masse oscillante jusqu'au rochet.The present invention relates to a coupling device, of the type used in automatic windings of wristwatches and, more particularly, to a coupling device transmitting the winding force from the oscillating mass to the ratchet.

Etat de la techniqueState of the art

Les montres à remontage automatique de type connu comportent, en général, un train de rouages ayant la fonction de transmettre le mouvement de la masse oscillante à la roue de rochet, éventuellement en redressant le sens de rotation, et en même temps de réduire la vitesse de la masse oscillante et d'accroitre la force destinée à armer le ressort de barillet. Un important rapport de démultiplication est nécessaire afin de vaincre la force de réaction élastique du ressort. Dans les réalisations pratiques, la transmission d'un mécanisme de remontage automatique comporte en général un rapport de réduction de 100 ou plus.The self-winding watches of known type generally comprise a gear train having the function of transmitting the movement of the oscillating mass to the ratchet wheel, possibly by straightening the direction of rotation, and at the same time reducing the speed of the oscillating mass and to increase the force intended to arm the mainspring. A large gear ratio is required in order to overcome the elastic reaction force of the spring. In practical embodiments, the transmission of an automatic winding mechanism generally has a reduction ratio of 100 or more.

Des tels niveaux de réduction sont assurés, dans les remontages automatiques de type connu, par un train de deux ou plus mobiles en série. Ces réductions occupent toutefois une place relativement importante augmentant ainsi les dimensions et l'épaisseur du mouvement automatique.Such levels of reduction are ensured, in automatic windings of known type, by a train of two or more moving in series. These reductions, however, occupy a relatively important place thus increasing the size and thickness of the automatic movement.

L'utilisation de plusieurs engrenages en série réduit par ailleurs le rendement d'ensemble de la transmission, et augmente la complexité et le coût du mouvement.The use of several gears in series further reduces the overall efficiency of the transmission, and increases the complexity and cost of movement.

Le dispositif d'accouplement utilisé pour le remontage automatique d'une montre doit inclure des éléments pour transformer le mouvement dans les deux sens de la masse oscillante en un mouvement à un sens seulement. Typiquement le dispositif inclut un embrayage unidirectionnel, en sorte que la masse oscillante tourne librement dans un sens et, dans l'autre sens, entraîne le système de transmission qui arme le ressort de barillet. Le brevet suisse CH694025 divulgue un dispositif d'accouplement avec deux embrayages unidirectionnels coaxiaux superposés, dans lequel le ressort du barillet est armé quel que ce soit le sens de rotation de la masse oscillante.The coupling device used for the automatic winding of a watch shall include elements to transform the two-way movement of the oscillating mass into one-way movement only. Typically the device includes a one-way clutch, so that the oscillating weight rotates freely in one direction and, in the other direction, drives the transmission system that arms the barrel spring. The Swiss patent CH694025 discloses a coupling device with two superposed coaxial unidirectional clutches, in which the barrel spring is armed whatever the direction of rotation of the oscillating mass.

Par ailleurs le document EP1046965 divulgue une montre à remontage automatique comprenant une masse de remontage oscillant grâce à un roulement à billes de grand diamètre, et des mobiles de réduction. L'utilisation d'un réducteur planétaire au centre du roulement impose cependant un roulement à billes de grand diamètre, et limite le rapport de réduction possible.In addition, the document EP1046965 discloses a self-winding watch comprising an oscillating winding mass through a large diameter ball bearing, and reduction mobiles. The use of a planetary gear in the center of the bearing, however, imposes a large diameter ball bearing, and limits the reduction ratio possible.

Le document GB2043826 divulgue un dispositif de transmission unidirectionnel comprenant une bague déformable. Ce dispositif est pratiquement impossible à miniaturiser dans les dimensions nécessaires à l'horlogerie. Par ailleurs, la bague déformable est dépourvue de dents et agit par friction, en sorte que le rapport de réduction est variable ; un tel dispositif est inadapté à des applications horlogères qui requièrent au contraire des rapports de réduction précisément définis.The document GB2043826 discloses a unidirectional transmission device comprising a deformable ring. This device is practically impossible to miniaturize in the dimensions necessary for watchmaking. Furthermore, the deformable ring is toothless and acts by friction, so that the reduction ratio is variable; such a device is unsuitable for horological applications which require, on the contrary, precisely defined reduction ratios.

Bref résumé de l'inventionBrief summary of the invention

Un but de la présente invention est de proposer un dispositif d'accouplement susceptible d'être utilisé pour le remontage automatique d'une montre bracelet exempt des limitations des dispositifs connus et, en particulier, un dispositif d'accouplement unidirectionnel avec un réducteur intégré occupant un volume aussi réduit que possible et avec un rendement élevé.An object of the present invention is to provide a coupling device that can be used for the automatic winding of a wristwatch free of the limitations of known devices and, in particular, a unidirectional coupling device with an integrated reducing gear occupying as small a volume as possible and with high efficiency.

Selon l'invention, ces buts sont atteints notamment au moyen de l'objet de la revendication principale, les revendications dépendantes se rapportant à des caractéristiques optionnelles et à des modes de réalisation avantageux de l'invention.According to the invention, these objects are achieved in particular by means of the object of the main claim, the dependent claims relating to optional features and advantageous embodiments of the invention.

Brève description des figuresBrief description of the figures

Des exemples de mise en oeuvre de l'invention sont indiqués dans la description illustrée par les figures annexées dans lesquelles :

  • La figure 1 illustre une partie du dispositif de remontage automatique d'une montre bracelet comprenant un dispositif d'accouplement selon un aspect de l'invention.
  • La figure 2 illustre le dispositif d'accouplement selon un aspect de l'invention, en coupe.
  • La figure 3 illustre une partie de l'embrayage unidirectionnel et du réducteur du dispositif d'accouplement selon un aspect de l'invention.
  • La figure 4 représente une partie du dispositif d'accouplement selon un aspect de l'invention.
Examples of implementation of the invention are indicated in the description illustrated by the appended figures in which:
  • The figure 1 illustrates a part of the automatic winding device of a wristwatch comprising a coupling device according to one aspect of the invention.
  • The figure 2 illustrates the coupling device according to one aspect of the invention, in section.
  • The figure 3 illustrates a portion of the one-way clutch and the coupling device reducer according to one aspect of the invention.
  • The figure 4 represents a part of the coupling device according to one aspect of the invention.

Exemple(s) de mode de réalisation de l'inventionExample (s) of embodiment of the invention

La figure 1 représente, en forme schématique, une partie du dispositif de remontage automatique d'une montre bracelet comprenant un dispositif d'accouplement selon un aspect de l'invention. Une masse oscillante 30 est fixée sur un rotor 39, lequel est agencé sur un roulement à billes (non visible sur cette figure), de manière à pouvoir tourner autour d'un axe central relativement au pont d'automatique 21 faisant office de support. Le rotor 39 est l'organe d'entrée du dispositif d'accouplement de l'invention 10, qui a la fonction de convertir le mouvement alterné de la masse oscillante 30 en mouvement unidirectionnel, et de fournir un rapport de démultiplication suffisant. Avantageusement, l'adoption d'un démultiplicateur harmonique permet la réalisation d'un dispositif d'accouplement 10 avec un volume extrêmement réduit, comme on le verra par la suite.The figure 1 represents, in schematic form, a part of the automatic winding device of a wristwatch comprising a coupling device according to one aspect of the invention. An oscillating mass 30 is fixed on a rotor 39, which is arranged on a ball bearing (not visible in this figure), so as to be rotatable about a central axis relative to the automatic bridge 21 acting as a support. The rotor 39 is the input member of the coupling device of the invention 10, which has the function of converting the alternating movement of the oscillating mass 30 into unidirectional movement, and to provide a sufficient gear ratio. Advantageously, the adoption of a harmonic reduction gear allows the realization of a coupling device 10 with an extremely small volume, as will be seen later.

Les éléments constitutifs du dispositif d'accouplement 10 de la figure 1 sont mieux visibles dans la coupe de la figure 2. Le rotor 39 se compose d'une virole reliée, à son diamètre externe, au pont d'automatique 21 par le roulement à billes externe 35 optionnel, de manière à pouvoir tourner sans friction par rapport au support 21. Le roulement à billes comporte des billes en acier ou, préférablement, des billes en céramique exempt de lubrification, par exemple des billes céramiques d'oxyde de zirconium.The constituent elements of the coupling device 10 of the figure 1 are better visible in the cut of the figure 2 . The rotor 39 consists of a ferrule connected, at its external diameter, to the automatic bridge 21 by the optional external ball bearing 35, so as to be able to rotate without friction with respect to the support 21. The ball bearing comprises steel balls or, preferably, ceramic balls free of lubrication, for example ceramic zirconium oxide beads.

La masse oscillante 30 est rivetée, ou fixée avec n'importe quel procédé approprié, sur la surface latérale du rotor 39, en sorte que le rotor 39 est animé d'un mouvement dans les deux sens lors du port de la montre.The oscillating mass 30 is riveted, or secured with any suitable method, to the side surface of the rotor 39, so that the rotor 39 is driven in both directions when wearing the watch.

Le diamètre interne du rotor 39 est relié, par l'embrayage unidirectionnel à billes 40, à un dispositif réducteur placé concentriquement à l'intérieur du rotor 39. L'embrayage unidirectionnel, mieux visible sur la figure 3, comporte une pluralité de billes 42 à la circonférence interne du rotor 39. L'espacement régulier autour de la circonférence est assuré par une cage 49 (appelée aussi séparateur de billes), solidaire en rotation avec l'anneau 50, qui est le dispositif d'entrée du réducteur. La cage 49 porte des logements pour les billes 42 avec des surfaces inclinées formant des patins coinceurs, de manière à coupler le rotor 39 avec l'anneau 50 seulement pour un sens de rotation. Le fonctionnement et la construction d'un tel embrayage unidirectionnel sont décrits dans le brevet CH694025 .The internal diameter of the rotor 39 is connected, by the unidirectional ball clutch 40, to a reducing device concentrically placed inside the rotor 39. The unidirectional clutch, better visible on the figure 3 , has a plurality of balls 42 at the inner circumference of the rotor 39. The regular spacing around the circumference is provided by a cage 49 (also called ball separator), integral in rotation with the ring 50, which is the device input of the reducer. The cage 49 carries housings for the balls 42 with inclined surfaces forming jamming pads, so as to couple the rotor 39 with the ring 50 only for a direction of rotation. The operation and construction of such a unidirectional clutch are described in the patent CH694025 .

Le dispositif d'accouplement illustré par les figures permet le remontage pour un seul sens de rotation de la masse oscillante, tandis que, dans l'autre sens, l'embrayage unidirectionnel 40 consent la rotation libre de la masse oscillante 30. On pourrait toutefois imaginer d'ajouter un second embrayage unidirectionnel et un inverseur, pour obtenir le remontage dans les deux sens, sans sortir du cadre de l'invention.The coupling device illustrated in the figures allows the winding of the oscillating mass to be reassembled for a single direction of rotation while in the other direction the unidirectional clutch 40 allows the free rotation of the oscillating mass 30. However, imagine adding a second unidirectional clutch and an inverter, to obtain reassembly in both directions, without departing from the scope of the invention.

En référence maintenant aux figures 2 et 4, l'anneau 50 est positionné concentriquement à l'intérieur du rotor 39 et est entrainé par l'embrayage unidirectionnel 40 toujours dans le même sens de rotation. L'anneau 50 porte, sur sa circonférence interne, deux galets 52 diamétralement opposés. Concentriquement et à l'intérieur de l'anneau 50 est placé un ruban déformable 60 avec une surface externe lisse et une surface interne dentée (la denture du ruban 60 n'est pas représentée pour simplifier les figures). Le ruban 60 a par exemple un diamètre primitif entre 2 et 5 millimètres, typiquement de l'ordre de 3 millimètres; le pas entre les dents sur la surface interne est typiquement compris entre 10 et 100 microns, typiquement 33 microns. Elle peut être réalisée par moulage, usinage laser, liga etc dans un matériau souple comme l'acier, le nickel, un alliage ou éventuellement un matériau synthétique.Referring now to figures 2 and 4 , the ring 50 is positioned concentrically inside the rotor 39 and is driven by the unidirectional clutch 40 always in the same direction of rotation. The ring 50 carries, on its inner circumference, two rollers 52 diametrically opposed. Concentrically and inside the ring 50 is placed a deformable ribbon 60 with a smooth outer surface and a toothed internal surface (the toothing of the ribbon 60 is not shown to simplify the figures). The ribbon 60 has for example a pitch diameter between 2 and 5 millimeters, typically of the order of 3 millimeters; the pitch between the teeth on the inner surface is typically between 10 and 100 microns, typically 33 microns. It can be made by molding, laser machining, liga etc in a flexible material such as steel, nickel, an alloy or possibly a synthetic material.

Au repos, la bande flexible 60 est circulaire. Les galets 52 agissent sur deux points diamétralement opposés de l'engrenage élastique 60, le déforment et lui font assumer une forme ovale. Les galets 52 poussent deux points diamétralement opposés du ruban élastique 60 vers la roue fixe 28 et le pignon central 65 qui sont à son intérieur. Les sections du ruban élastiques comprises entre les galets 52 s'écartent élastiquement des roues internes 28 et 68, en sorte que l'engagement entre le ruban 60 et les roues internes 28 et 68 est limité aux deux points opposés de contact avec les galets 52.At rest, the flexible band 60 is circular. The rollers 52 act on two diametrically opposite points of the elastic gear 60, deform and make it assume an oval shape. The rollers 52 push two diametrically opposite points of the elastic band 60 towards the fixed wheel 28 and the central gear 65 which are inside. The elastic ribbon sections between the rollers 52 elastically apart from the inner wheels 28 and 68, so that the engagement between the ribbon 60 and the inner wheels 28 and 68 is limited to the two opposite points of contact with the rollers 52. .

Selon un aspect de l'invention, le ruban élastique 60 porte un nombre N1 de dents à son intérieur. La roue fixe 28, maintenue immobile par la vis 25 porte le même nombre de dents N1 du ruban. Lors de la rotation de l'anneau d'entrée 50, l'ovale décrit par le ruban 60 tourne, et tous les dents du ruban 60 s'engrènent successivement avec les dents de la roue fixe 28. Cependant, le ruban ne peut pas tourner, car le pas angulaires de la roue fixe 28 et du ruban élastique 60 sont identiques.According to one aspect of the invention, the elastic band 60 carries a number N1 of teeth inside. The fixed wheel 28, held stationary by the screw 25 has the same number of teeth N1 of the ribbon. When rotation of the input ring 50, the oval described by the ribbon 60 rotates, and all the teeth of the ribbon 60 meshing successively with the teeth of the fixed wheel 28. However, the ribbon can not turn because the angular pitch of the fixed wheel 28 and the elastic band 60 are identical.

Selon des variantes non illustrées, la roue fixe 28 pourrait être remplacée par d'autres dispositifs ayant la fonction d'empêcher la rotation du ruban élastique 60 tout en lui permettant de se déformer, par exemple des lamelles radiales reliant le ruban élastique au support, ou tout autre dispositif équivalent.According to non-illustrated variants, the fixed wheel 28 could be replaced by other devices having the function of preventing the rotation of the elastic band 60 while allowing it to be deformed, for example radial strips connecting the elastic band to the support, or any other equivalent device.

En même temps, les dents du ruban 60 s'engrènent successivement avec les dents du pignon central 65. Selon un aspect de l'invention, le pignon central a un nombre de dents N2 différent de N1. Par conséquent, le pas angulaire de la denture du pignon central est différent de celui du ruban denté 60, et le pignon 65 est entraîné en rotation. Pour chaque révolution de l'anneau d'entrée 50, les N2 dents du pignon central s'engrènent avec les N1 dents du ruban 60 en succession et le pignon effectue donc une fraction (N2-N1)/N2 de rotation.At the same time, the teeth of the ribbon 60 meshes successively with the teeth of the central pinion 65. According to one aspect of the invention, the central pinion has a number of teeth N2 different from N1. Consequently, the angular pitch of the gear of the central gear is different from that of the gear 60, and the gear 65 is rotated. For each revolution of the input ring 50, the teeth N2 of the central gear meshes with the N1 teeth of the ribbon 60 in succession and the pinion thus performs a fraction (N2-N1) / N2 rotation.

Le réducteur comprenant l'anneau d'entrée, 50, le ruban denté flexible 60, la roue fixe 28 et le pignon central 65 constitue un démultiplicateur harmonique dont le rapport de réduction est fixe et est donné par N2/(N1-N2), N1 et N2 étant le nombre de dents du ruban élastique 60 et du pignon central 65. Si par exemple par exemple N1= 92 et N2=90 le rapport de réduction du démultiplicateur harmonique est de 45:1. Ce rapport peut être obtenu avec une courroie d'un diamètre égal à trois millimètres en employant une denture de module 0.033, suffisant pour transmettre les couples requis dans une application horlogère. Le pignon central 65 relié au pont d'automatique 21 par le palier à billes 38 et est solidaire d'une roue dentée de sortie 70, sur le même axe. La roue de sortie 70 tourne dans un seul sens et peut remonter un ressort de barillet avec un seul mobile de réduction intermédiaire.The gearbox comprising the input ring, 50, the flexible toothed ribbon 60, the fixed wheel 28 and the central gear 65 constitutes a harmonic reduction gear whose reduction ratio is fixed and is given by N 2 / (N 1 -N 2), N1 and N2 being the number of teeth of the elastic band 60 and the central gear 65. If for example for example N1 = 92 and N2 = 90 the reduction ratio of the harmonic gearbox is 45: 1. This ratio can be obtained with a belt with a diameter of three millimeters by using a 0.033 module toothing, sufficient to transmit the required torque in a watch application. The central pinion 65 connected to the automatic bridge 21 by the ball bearing 38 and is integral with a toothed output wheel 70, on the same axis. The output wheel 70 rotates in one direction and can raise a mainspring with a single intermediate reduction mobile.

L'arrangement particulier du démultiplicateur (réducteur) harmonique avec des galets 52 en appui sur la surface externe de la courroie permet une réalisation particulièrement compacte. Il est cependant possible, bien que moins avantageux, d'obtenir la forme non circulaire de la courroie avec d'autres arrangement, par exemple avec des galets ou d'autres éléments à l'intérieur de la courroie 60.The particular arrangement of the harmonic reduction gear (reducer) with rollers 52 resting on the outer surface of the belt allows a particularly compact embodiment. However, it is possible, although less advantageous, to obtain the non-circular shape of the belt with other arrangements, for example with rollers or other elements inside the belt 60.

Le dispositif d'accouplement de l'invention combine, dans un volume réduit, essentiellement intégré dans le palier de roulement de la masse oscillante 30, un embrayage unidirectionnel et un réducteur offrant une importante multiplication de la force de remontage. Il permet ainsi de réaliser un mécanisme de remontage automatique très compact, dont la hauteur ne dépasse pas deux millimètres, de préférence même au-dessous du millimètre, pouvant être facilement intégré dans des montres bracelets. En particulier, le dispositif d'accouplement de l'invention permet d'ajouter un mécanisme de remontage automatique à un mouvement à remontage manuel sans augmenter sensiblement l'épaisseur du mouvement.The coupling device of the invention combines, in a reduced volume, substantially integrated in the rolling bearing of the oscillating mass 30, a unidirectional clutch and a gearbox providing a large multiplication of the winding force. It allows to realize a very compact automatic winding mechanism, whose height does not exceed two millimeters, preferably even below the millimeter, which can be easily integrated into wristwatches. In particular, the coupling device of the invention makes it possible to add an automatic winding mechanism to a manually wound movement without substantially increasing the thickness of the movement.

Numéros de référence employés sur les figuresReference numbers used in the figures

1010
dispositif d'accouplementcoupling device
2020
pont d'automatique, supportautomatic bridge, support
2121
pont d'automatique, supportautomatic bridge, support
2525
visscrew
2828
roue dentée fixefixed gear
3030
masse oscillanteoscillating weight
3535
roulement à billes externeexternal ball bearing
3838
roulement à billes interneinternal ball bearing
3939
rotorrotor
4040
embrayage unidirectionnel à billesunidirectional ball clutch
4242
billesball
4444
patinsskates
4949
cagecage
5050
anneau d'entrée du réducteurreducer inlet ring
5252
galetpebble
6060
ruban élastiqueelastic tape
6565
pignon centralcentral gear
7070
roue de sortieexit wheel

Claims (13)

  1. Coupling device for transmitting the movement of an oscillating mass to a mainspring of an automatic wristwatch, the coupling device including:
    - a support (21);
    - a rotor (39) free to turn around an axis relative to the support (21);
    - a reducer having an entry element (50) arranged to be driven by the rotor (39) and an exit element (70), for winding the mainspring;
    - an unidirectional clutch (40) between the rotor (39) and the entry element (50) of the reduction, arranged so that the input element (50) of the reduction rotates in one direction, whatever the rotation direction of the rotor (39);
    characterised in that
    - the reducer includes an harmonic reducer;
    - and in that the reduction includes a flexible toothed spline (60), such that said entry element (50) deforms said spline without setting it into rotation.
  2. Device according to claim 1, wherein the reducer moreover includes a gear pinion arranged to be driven by the flexible spline.
  3. Device according to claim 2, wherein the flexible toothed spline (60) has a number of teeth N1, and said gear pinion (65) has a number of teeth N2 different from N1, the reduction ration of said reducer being N2/(N1-N2).
  4. Device according to any of claims from 2 to 3, wherein said entry element is a ring (50) with two rollers (52) placed opposite on a diameter, wherein the flexible spline (60), circular in its rest state, is placed coaxially inside the ring (50) such that the rollers, touching the external surface of the flexible spline (60) deform it as to assume an oval shape, the gear pinion (65) being coaxially placed inside the flexible spline, the teeth of the flexible spline (60) meshing with the teeth of the gear pinion (65) at the two points of contact with the rollers (52) opposite on a diameter.
  5. Device according to any of claims from 2 to 3, comprising means to prevent the rotation of the flexible spline (60) while allowing its deformation, for example a fixed gear (28) having the same number of teeth as the flexible spline (60), coaxially superposed to the pinion gear (65), the teeth of the flexible spline (60) meshing with those of the fixed gear (28) at the two points of contact with the rollers (52) opposite on a diameter.
  6. Device according to any of claims from 1 to 5, comprising a ball bearing (35) assuring the connexion between the rotor (39) and the support (21).
  7. Device according to any of claims from 2 to 6, comprising a ball bearing (35) assuring the connexion between the gear pinion (65) and the support.
  8. Device according to any of claims from 1 to 7, wherein the unidirectional clutch (40) includes a plurality of balls (42) distributed inside the internal circumference of the rotor (39), a cage (49), having lodgements for the balls (42), attached for rotating with the ring (50), the lodgements having inclined surfaces (45) acting as chucks, so as to couple the ring (50) with the rotor (39) for only one direction of rotation.
  9. Device according to any of claims from 5 to 7, wherein the unidirectional clutch and/or at least one of the ball bearing includes ceramic balls and is lubrication-free.
  10. Device according to claim 9, comprising a second unidirectional clutch and an inverter, to allow the winding of the main spring in both directions.
  11. Device according to any of claims from 2 to 10, comprising an exit gear (70) coaxially connected with said pinion gear (65), for driving an axle of a barrel spring.
  12. Device according to cléaim 11, wherein the exit gear (70) drives a ratchet wheel of a barrel by an intermediate reducing wheel.
  13. Automatic watch movement including a device according to any of claims 11 or 12.
EP10176506A 2009-09-24 2010-09-14 Coupling device Active EP2302468B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH01476/09A CH701883A1 (en) 2009-09-24 2009-09-24 Coupling device.

Publications (2)

Publication Number Publication Date
EP2302468A1 EP2302468A1 (en) 2011-03-30
EP2302468B1 true EP2302468B1 (en) 2012-05-09

Family

ID=41818330

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10176506A Active EP2302468B1 (en) 2009-09-24 2010-09-14 Coupling device

Country Status (4)

Country Link
EP (1) EP2302468B1 (en)
AT (1) ATE557327T1 (en)
CH (1) CH701883A1 (en)
HK (1) HK1154947A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2860590B1 (en) 2013-10-10 2016-04-06 Patek Philippe SA Genève Automatic winding device for a timepiece

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3657875A (en) * 1970-09-21 1972-04-25 Gruen Ind Inc Electro-mechanical drive mechanism for watches and related devices
GB2043826A (en) 1979-03-01 1980-10-08 Borg Warner Rotary Drive Device
EP1046965B1 (en) * 1999-04-23 2004-08-18 Rolex Sa Self-winding watch
CH694025A5 (en) * 2000-03-17 2004-06-15 Soprod S A Coupling device for converting a rotational movement in both directions by a movement in one direction.

Also Published As

Publication number Publication date
HK1154947A1 (en) 2012-05-04
EP2302468A1 (en) 2011-03-30
ATE557327T1 (en) 2012-05-15
CH701883A1 (en) 2011-03-31

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