EP2860590B1 - Automatic winding device for a timepiece - Google Patents

Automatic winding device for a timepiece Download PDF

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Publication number
EP2860590B1
EP2860590B1 EP13004864.8A EP13004864A EP2860590B1 EP 2860590 B1 EP2860590 B1 EP 2860590B1 EP 13004864 A EP13004864 A EP 13004864A EP 2860590 B1 EP2860590 B1 EP 2860590B1
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EP
European Patent Office
Prior art keywords
wheel
fixed
ring
automatic winding
winding device
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EP13004864.8A
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German (de)
French (fr)
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EP2860590A1 (en
Inventor
Déhon Nicolas
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Patek Philippe SA Geneve
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Patek Philippe SA Geneve
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Priority to EP13004864.8A priority Critical patent/EP2860590B1/en
Publication of EP2860590A1 publication Critical patent/EP2860590A1/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
    • 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
    • G04B5/18—Supports, suspensions or guide arrangements, for oscillating weights
    • G04B5/184—Guide arrangement of the moving weight in a circular course

Definitions

  • the present invention relates to an automatic winding device for a timepiece. More particularly, the present invention relates to an automatic winding device comprising an oscillating mass, a gearbox for transmitting the movement of the oscillating mass to a mainspring and a unidirectional transmission device for transmitting said movement only in one direction.
  • the gearbox serves to reduce the rotational speed transmitted to the ratchet of the barrel and thus to increase the torque.
  • a gear train is used as gearbox whose gear ratio is chosen to obtain the desired gearing factor.
  • Such a reducer has two major drawbacks: it is bulky and it consumes a lot of energy because of the friction between the different mobiles.
  • the patent application EP 2,302,468 discloses an automatic winding device whose gear comprises an input member, a fixed wheel, a movable wheel coaxial with the fixed wheel, an output wheel secured to the movable wheel and a drive member of the movable wheel.
  • the input member is a ring carrying two diametrically opposed rollers.
  • the drive member is a flexible ribbon having an internal toothing that meshes with the fixed and movable wheels.
  • the two rollers of the ring permanently deform the flexible tape to make it take an oval shape so that the engagement between the ribbon and the fixed and mobile wheels is limited to two opposite points of contact with the rollers.
  • the flexible tape can not rotate relative to the fixed wheel, because the pitch of its teeth is substantially identical to that of the fixed wheel.
  • an automatic winding device whose gearbox comprises, according to a first embodiment, a first wheel driven eccentrically and having an external toothing, guiding pins integral with the first wheel and engaged in larger diameter openings in a bridge movement, and a second wheel comprising an internal toothing cooperating with the external toothing of the first wheel.
  • the second wheel also includes an external toothing kinematically connected to the barrel ratchet.
  • the patent application WO 2011/092153 also discloses a second embodiment wherein the reducer comprises a fixed wheel, a movable wheel coaxial with the fixed wheel, an output wheel secured to the movable wheel and a satellite.
  • the satellite is composed of two coaxial satellites that mesh respectively with the fixed and mobile wheels.
  • the satellite is pivotally mounted on the output ring of a unidirectional transmission device located between the oscillating mass and the gearbox.
  • This type of reducer is disadvantageous in terms of space because during the rotation of said output ring the satellite scans a whole space that can not be occupied by any other component.
  • the present invention aims to overcome the aforementioned disadvantages and proposes for this purpose an automatic winding device for a timepiece, comprising an oscillating mass, a gearbox for transmitting the movement of the oscillating mass to a mainspring and a device for unidirectional transmission for transmitting said movement only in one direction, the gearbox comprising an input member, a fixed wheel, a movable wheel coaxial with the fixed wheel, an output member kinematically connected to the moving wheel and a drive member controlled by the input member, the driving member surrounding the fixed and movable wheels and meshing with them to rotate the moving wheel, characterized in that the drive member is a rigid ring disposed eccentrically relative to fixed and mobile wheels and arranged to roll without sliding on the fixed wheel.
  • the fixed and mobile wheels have the same diameter and a different number of teeth, and mesh with the same internal toothing of the drive member.
  • the input member is typically a ring surrounding the drive member and whose outer surface is coaxial with the fixed and movable wheels and the inner surface is eccentric with respect to the fixed and movable wheels.
  • the output member is for example a wheel secured to the moving wheel.
  • the unidirectional transmission device is located between the oscillating mass and the gearbox, and is in the form of a unidirectional ball bearing.
  • an automatic winding device for a timepiece such as a wristwatch, comprises a fixed oscillating weight 1 (for example driven or riveted) on a rotor 2 mounted via a first ball bearing 3 on a support 4.
  • the support 4 is typically an automatic bridge integral with the stage of the movement on which or in which the automatic winding device is mounted.
  • the rotor 2 and, with it, the oscillating mass 1 are pivotable relative to the support 4 about an axis A.
  • the rotor 2 constitutes, with a cone 5 fixed on it, the outer ring of a second ball bearing 6
  • the second ball bearing 6 is of unidirectional type, that is to say that its inner ring 7 is driven by the outer ring 2, 5 when the latter rotates in a determined direction, and is not driven by the outer ring 2, 5 when the latter rotates in the opposite direction.
  • wedging pads 5a are arranged between the rotor 2 and the cone 5 and each comprise an inclined surface used to wedge a corresponding ball to make the outer rings 2, 5 and inner 7 rotate together when the outer ring 2, 5 turns in said determined direction, and a housing for releasing said ball when the outer ring 2, 5 rotates in the opposite direction.
  • the inner ring 7 thus always rotates in the same direction, the rotation of the oscillating mass 1 in the other direction having no effect on it.
  • the outer ring of the second ball bearing 6 could be in one piece, that is to say consisting of the rotor 2 only, and the cone 5 and the wedging pads 5a could be associated with the inner ring 7. Regardless of whether the pads are mounted in the outer ring or Inland, these also ensure that the balls remain at substantially equal distances from each other as usually the cage of a bidirectional type ball bearing.
  • the outer surface 8 of the ring 7 is centered on the axis A. Its inner surface 9, on the other hand, is eccentric with respect to the axis A, as is clearly visible on the figures 1 and 3 .
  • a ring 10 is mounted inside the ring 7 via a third ball bearing 11. The outer and inner surfaces of the ring 10 are coaxial with the inner surface 9 of the ring 7, so eccentric by relative to the axis A.
  • the ring 10 carries an internal toothing 12 which can be integral with the ring 10 or in the form of an insert, as shown in FIG. figure 1 .
  • the internal toothing 12 meshes with two coaxial wheels 13, 14 centered on the axis A.
  • the wheel 13 is fixed relative to the support 4.
  • the wheel 14 it is movable relative to the support 4 and integral in rotation with a output wheel 15 which is mounted on the support 4 by means of a fourth ball bearing 16 or, alternatively, via a sliding bearing.
  • the output wheel 15 meshes with the wheel 17a of a reduction gear whose pinion 17b meshes with and drives a barrel ratchet 18 to arm the spring of said barrel.
  • the assembly comprising the ring 7 (more precisely its inner surface 9), the ring 10, the fixed and movable wheels 13, 14 and the output wheel 15 constitutes a reducer used to increase the torque supplied to the barrel ratchet 18 and of which the ring 7 forms the inlet and the wheel 15 the outlet.
  • the reducer is shown in top view at the figure 3 .
  • the rotation of the ring 7 controls the movement of the ring 10 by requiring the latter to roll without sliding on the fixed wheel 13, thereby describing at each point of the pitch circle of the ring 10 a pericycloid.
  • part 7a of the ring 7 whose radial distance between the outer surface 8 and the inner surface 9 is the largest radially adjacent portion 10a of the ring 10 in contact with the teeth of the fixed and movable wheels 13, 14.
  • the teeth 12 of the ring 10 meshes successively with the teeth of the fixed wheel 13, the steps of their respective teeth being substantially identical.
  • the moving wheel 14 has the same pitch diameter as the fixed wheel 13 but a slightly different number of teeth. The equality of the pitch diameters of the fixed wheels 13 and mobile 14 is practically achievable by admitting a slight difference in pitch of their teeth.
  • the bearing of the ring 10 on the fixed wheel 13 thus drives the mobile wheel 14 in rotation about the axis A by meshing between the ring 10 and the moving wheel 14, the steps of their respective teeth being, too, substantially equal.
  • the rotational speed of the moving wheel 14, at the output of the gearbox is much lower than that of the ring 7, at the input of the gearbox.
  • the number of teeth N1 of the mobile wheel 14 differs from the number of teeth N2 of the fixed wheel 13 of only one or two teeth, which allows the internal toothing 12 to mesh simultaneously with these two wheels and offers a large reduction ratio.
  • the reduction ratio between the angular speed of the ring 7 and the angular velocity of the moving wheel 14 is equal to N 2 / (N 2 -N 1).
  • the internal toothing 12 of the ring 10 has 52 teeth
  • the toothing of the fixed wheel 13 has 50 teeth
  • the toothing of the movable wheel 14 has 48 or 49 teeth, which makes a reduction ratio of 25 or 50, respectively.
  • the reduction gear 17a-17b performs an additional reduction by a factor of 2
  • the torque supplied to the barrel ratchet 18 is 50 or 100 times greater than the torque produced by the oscillating weight 1.
  • the internal teeth 12 of the ring 10 and the teeth of the wheels 13, 14 could be arranged differently in terms of diameters and numbers of teeth.
  • the wheels 13, 14 could be identical (same diameter, same number of teeth) and the ring 10 could carry two superposed internal teeth having different numbers of teeth.
  • the Wheels 13, 14 could also have different diameters and mesh with respective internal teeth of the ring 10.
  • the skilled person will understand that there are many possibilities for rolling the or an internal toothing of the ring 10 on the teeth of the fixed wheel 13 and thus drive the mobile wheel 14 by the simultaneous meshing between the or other internal toothing of the ring 10 and the toothing of the mobile wheel 14.
  • the figure 3 shows an exemplary embodiment in which the internal toothing 12 of the ring 10 and the teeth of the wheels 13, 14 have a triangular profile.
  • the figure 4 shows another embodiment in which the internal toothing 12 of the ring 10 and the teeth of the wheels 13, 14 have a involute profile of a circle.
  • the automatic winding device according to the invention is very compact because it does not require the use of a gear reduction gears or satellite gears.
  • a gear reduction gears or satellite gears As the drive of the moving wheel 14 is performed by a rigid ring (the ring 10), and not by a flexible tape as in the document EP 2,302,468 , a better return is assured.
  • the unidirectional ball bearing 6 could be replaced by another type of unidirectional transmission device, such as a ratchet clutch device.
  • the unidirectional transmission device could be located downstream of the gearbox, although its arrangement between the oscillating weight and the gearbox is preferred to minimize the dead angle perceived at the oscillating weight.
  • the present invention also does not exclude the use of a second unidirectional transmission device which, coupled with the first, would provide the overall function of the rectifier. The output of this rectifier would then constitute the input of the reduction device as described, a such an arrangement for raising the mainspring in both directions of rotation of the oscillating mass.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Retarders (AREA)

Description

La présente invention concerne un dispositif de remontage automatique pour une pièce d'horlogerie. Plus particulièrement, la présente invention concerne un dispositif de remontage automatique comprenant une masse oscillante, un réducteur pour transmettre le mouvement de la masse oscillante à un ressort de barillet et un dispositif de transmission unidirectionnel pour ne transmettre ledit mouvement que dans un sens.The present invention relates to an automatic winding device for a timepiece. More particularly, the present invention relates to an automatic winding device comprising an oscillating mass, a gearbox for transmitting the movement of the oscillating mass to a mainspring and a unidirectional transmission device for transmitting said movement only in one direction.

Dans un tel dispositif, le réducteur sert à réduire la vitesse de rotation transmise au rochet du barillet et donc à augmenter le couple. Traditionnellement on utilise comme réducteur un rouage dont les rapports d'engrenage sont choisis pour obtenir le facteur de démultiplication souhaité. Un tel réducteur présente deux inconvénients majeurs : il est encombrant et il consomme beaucoup d'énergie en raison des frottements entre les différents mobiles.In such a device, the gearbox serves to reduce the rotational speed transmitted to the ratchet of the barrel and thus to increase the torque. Traditionally, a gear train is used as gearbox whose gear ratio is chosen to obtain the desired gearing factor. Such a reducer has two major drawbacks: it is bulky and it consumes a lot of energy because of the friction between the different mobiles.

La demande de brevet EP 2.302.468 décrit un dispositif de remontage automatique dont le réducteur comprend un organe d'entrée, une roue fixe, une roue mobile coaxiale à la roue fixe, une roue de sortie solidaire de la roue mobile et un organe d'entraînement de la roue mobile. L'organe d'entrée est un anneau portant deux galets diamétralement opposés. L'organe d'entraînement est un ruban flexible présentant une denture intérieure qui engrène avec les roues fixe et mobile. Les deux galets de l'anneau déforment en permanence le ruban flexible pour lui faire prendre une forme ovale de sorte que l'engagement entre le ruban et les roues fixe et mobile est limité aux deux points opposés de contact avec les galets. Le ruban flexible ne peut pas tourner par rapport à la roue fixe, car le pas de sa denture est sensiblement identique à celui de la roue fixe. Lors de la rotation de l'anneau, l'ovale décrit par le ruban flexible tourne et les dents de ce dernier engrènent successivement avec les dents de la roue fixe. Les nombres de dents des roues fixe et mobile différant légèrement ont pour effet de faire tourner la roue mobile et la roue de sortie qui lui est associée. Ce dispositif résout le problème d'encombrement des réducteurs à rouage traditionnels. Toutefois, le fait qu'il nécessite en permanence de déformer un ruban flexible limite son rendement, cette limitation étant principalement imputable aux contre-réactions générées dans les paliers des galets de l'anneau.The patent application EP 2,302,468 discloses an automatic winding device whose gear comprises an input member, a fixed wheel, a movable wheel coaxial with the fixed wheel, an output wheel secured to the movable wheel and a drive member of the movable wheel. The input member is a ring carrying two diametrically opposed rollers. The drive member is a flexible ribbon having an internal toothing that meshes with the fixed and movable wheels. The two rollers of the ring permanently deform the flexible tape to make it take an oval shape so that the engagement between the ribbon and the fixed and mobile wheels is limited to two opposite points of contact with the rollers. The flexible tape can not rotate relative to the fixed wheel, because the pitch of its teeth is substantially identical to that of the fixed wheel. During the rotation of the ring, the oval described by the flexible tape rotates and the teeth of the latter meshing successively with the teeth of the fixed wheel. The numbers of teeth of the fixed and movable wheels slightly differing have the effect of rotating the moving wheel and the output wheel associated therewith. This device solves the problem the size of traditional gearboxes. However, the fact that it permanently requires deformation of a flexible tape limits its performance, this limitation being mainly attributable to the counter-reactions generated in the bearings of the rollers of the ring.

On connaît aussi par la demande de brevet WO 2011/092153 un dispositif de remontage automatique dont le réducteur comprend, selon un premier mode de réalisation, une première roue entraînée excentriquement et comportant une denture extérieure, des goupilles de guidage solidaires de la première roue et engagées dans des ouvertures de plus grand diamètre ménagées dans un pont du mouvement, et une deuxième roue comprenant une denture intérieure coopérant avec la denture extérieure de la première roue. Grâce aux goupilles de guidage la première roue roule sans glissement sur la denture intérieure de la deuxième roue, de sorte que chaque point du cercle primitif de la première roue décrit une hypocycloïde (pour un observateur placé sur la deuxième roue). La deuxième roue comprend également une denture extérieure reliée cinématiquement au rochet du barillet. Ce dispositif présente l'inconvénient d'être encombrant en hauteur (à cause notamment des goupilles de guidage) et de produire des frottements entre les goupilles de guidage et le pont, frottements qui limitent le rendement du réducteur.Also known by the patent application WO 2011/092153 an automatic winding device whose gearbox comprises, according to a first embodiment, a first wheel driven eccentrically and having an external toothing, guiding pins integral with the first wheel and engaged in larger diameter openings in a bridge movement, and a second wheel comprising an internal toothing cooperating with the external toothing of the first wheel. With the guiding pins the first wheel rolls without sliding on the internal toothing of the second wheel, so that each point of the pitch circle of the first wheel describes a hypocycloid (for an observer placed on the second wheel). The second wheel also includes an external toothing kinematically connected to the barrel ratchet. This device has the disadvantage of being cumbersome in height (especially because of the guide pins) and to produce friction between the guide pins and the bridge, friction which limit the efficiency of the reducer.

La demande de brevet WO 2011/092153 décrit aussi un deuxième mode de réalisation dans lequel le réducteur comprend une roue fixe, une roue mobile coaxiale à la roue fixe, une roue de sortie solidaire de la roue mobile et un satellite. Le satellite est composé de deux satellites coaxiaux qui engrènent respectivement avec les roues fixe et mobile. Le satellite est monté pivotant sur la bague de sortie d'un dispositif de transmission unidirectionnel situé entre la masse oscillante et le réducteur. Ce type de réducteur est désavantageux en termes d'encombrement car durant la rotation de ladite bague de sortie le satellite balaie tout un espace qui ne peut être occupé par aucun autre composant.The patent application WO 2011/092153 also discloses a second embodiment wherein the reducer comprises a fixed wheel, a movable wheel coaxial with the fixed wheel, an output wheel secured to the movable wheel and a satellite. The satellite is composed of two coaxial satellites that mesh respectively with the fixed and mobile wheels. The satellite is pivotally mounted on the output ring of a unidirectional transmission device located between the oscillating mass and the gearbox. This type of reducer is disadvantageous in terms of space because during the rotation of said output ring the satellite scans a whole space that can not be occupied by any other component.

La présente invention vise à remédier aux inconvénients susmentionnés et propose à cette fin un dispositif de remontage automatique pour une pièce d'horlogerie, comprenant une masse oscillante, un réducteur pour transmettre le mouvement de la masse oscillante à un ressort de barillet et un dispositif de transmission unidirectionnel pour ne transmettre ledit mouvement que dans un sens, le réducteur comprenant un organe d'entrée, une roue fixe, une roue mobile coaxiale à la roue fixe, un organe de sortie relié cinématiquement à la roue mobile et un organe d'entraînement commandé par l'organe d'entrée, l'organe d'entraînement entourant les roues fixe et mobile et engrenant avec elles pour faire tourner la roue mobile, caractérisé en ce que l'organe d'entraînement est une bague rigide disposée excentriquement par rapport aux roues fixe et mobile et agencée pour rouler sans glissement sur la roue fixe.The present invention aims to overcome the aforementioned disadvantages and proposes for this purpose an automatic winding device for a timepiece, comprising an oscillating mass, a gearbox for transmitting the movement of the oscillating mass to a mainspring and a device for unidirectional transmission for transmitting said movement only in one direction, the gearbox comprising an input member, a fixed wheel, a movable wheel coaxial with the fixed wheel, an output member kinematically connected to the moving wheel and a drive member controlled by the input member, the driving member surrounding the fixed and movable wheels and meshing with them to rotate the moving wheel, characterized in that the drive member is a rigid ring disposed eccentrically relative to fixed and mobile wheels and arranged to roll without sliding on the fixed wheel.

De préférence, les roues fixe et mobile ont un même diamètre et un nombre de dents différent, et engrènent avec une même denture intérieure de l'organe d'entraînement.Preferably, the fixed and mobile wheels have the same diameter and a different number of teeth, and mesh with the same internal toothing of the drive member.

L'organe d'entrée est typiquement une bague entourant l'organe d'entraînement et dont la surface extérieure est coaxiale aux roues fixe et mobile et la surface intérieure est excentrée par rapport aux roues fixe et mobile.The input member is typically a ring surrounding the drive member and whose outer surface is coaxial with the fixed and movable wheels and the inner surface is eccentric with respect to the fixed and movable wheels.

L'organe de sortie est par exemple une roue solidaire de la roue mobile.The output member is for example a wheel secured to the moving wheel.

De préférence, le dispositif de transmission unidirectionnel est situé entre la masse oscillante et le réducteur, et est sous la forme d'un roulement à billes unidirectionnel.Preferably, the unidirectional transmission device is located between the oscillating mass and the gearbox, and is in the form of a unidirectional ball bearing.

D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description détaillée suivante faite en référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue en coupe du dispositif de remontage automatique selon l'invention ;
  • la figure 2 est une vue de dessus schématique d'un roulement à billes unidirectionnel utilisé dans le dispositif de remontage automatique selon l'invention ;
  • la figure 3 est une vue de dessus schématique d'un réducteur utilisé dans le dispositif de remontage automatique selon l'invention ; et
  • la figure 4 est une vue de dessus schématique d'une variante du réducteur utilisé dans le dispositif de remontage automatique selon l'invention.
Other features and advantages of the present invention will appear on reading the following detailed description given with reference to the accompanying drawings in which:
  • the figure 1 is a sectional view of the automatic winding device according to the invention;
  • the figure 2 is a schematic top view of a unidirectional ball bearing used in the automatic winding device according to the invention;
  • the figure 3 is a schematic top view of a gearbox used in the automatic winding device according to the invention; and
  • the figure 4 is a schematic top view of a variant of the gearbox used in the automatic winding device according to the invention.

En référence à la figure 1, un dispositif de remontage automatique selon l'invention, pour une pièce d'horlogerie telle qu'une montre-bracelet, comprend une masse oscillante 1 fixée (par exemple chassée ou rivetée) sur un rotor 2 monté par l'intermédiaire d'un premier roulement à billes 3 sur un support 4. Le support 4 est typiquement un pont d'automatique solidaire de la platine du mouvement sur lequel ou dans lequel le dispositif de remontage automatique est monté. Le rotor 2 et, avec lui, la masse oscillante 1 sont pivotants par rapport au support 4 autour d'un axe A. Le rotor 2 constitue, avec un cône 5 fixé sur lui, la bague extérieure d'un deuxième roulement à billes 6. Le deuxième roulement à billes 6 est de type unidirectionnel, c'est-à-dire que sa bague intérieure 7 est entraînée par la bague extérieure 2, 5 lorsque cette dernière tourne dans un sens déterminé, et n'est pas entraînée par la bague extérieure 2, 5 lorsque cette dernière tourne dans le sens opposé. À cet effet, comme visible sur les figures 1 et 2, des patins de coincement 5a sont disposés entre le rotor 2 et le cône 5 et comprennent chacun une surface inclinée servant à coincer une bille correspondante pour rendre les bagues extérieure 2, 5 et intérieure 7 solidaires en rotation lorsque la bague extérieure 2, 5 tourne dans ledit sens déterminé, et un logement pour libérer ladite bille lorsque la bague extérieure 2, 5 tourne dans le sens opposé. La bague intérieure 7 tourne ainsi toujours dans le même sens, la rotation de la masse oscillante 1 dans l'autre sens n'ayant aucun effet sur elle. Dans une variante, la bague extérieure du deuxième roulement à billes 6 pourrait être en une pièce, c'est-à-dire constituée du rotor 2 uniquement, et le cône 5 et les patins de coincement 5a pourraient être associés à la bague intérieure 7. Indépendamment du fait que les patins soient montés dans la bague extérieure ou intérieure, ceux-ci assurent aussi que les billes restent à des distances sensiblement égales les unes des autres comme le fait habituellement la cage d'un roulement à billes du type bidirectionnel.With reference to the figure 1 , an automatic winding device according to the invention, for a timepiece such as a wristwatch, comprises a fixed oscillating weight 1 (for example driven or riveted) on a rotor 2 mounted via a first ball bearing 3 on a support 4. The support 4 is typically an automatic bridge integral with the stage of the movement on which or in which the automatic winding device is mounted. The rotor 2 and, with it, the oscillating mass 1 are pivotable relative to the support 4 about an axis A. The rotor 2 constitutes, with a cone 5 fixed on it, the outer ring of a second ball bearing 6 The second ball bearing 6 is of unidirectional type, that is to say that its inner ring 7 is driven by the outer ring 2, 5 when the latter rotates in a determined direction, and is not driven by the outer ring 2, 5 when the latter rotates in the opposite direction. For this purpose, as visible on figures 1 and 2 , wedging pads 5a are arranged between the rotor 2 and the cone 5 and each comprise an inclined surface used to wedge a corresponding ball to make the outer rings 2, 5 and inner 7 rotate together when the outer ring 2, 5 turns in said determined direction, and a housing for releasing said ball when the outer ring 2, 5 rotates in the opposite direction. The inner ring 7 thus always rotates in the same direction, the rotation of the oscillating mass 1 in the other direction having no effect on it. In a variant, the outer ring of the second ball bearing 6 could be in one piece, that is to say consisting of the rotor 2 only, and the cone 5 and the wedging pads 5a could be associated with the inner ring 7. Regardless of whether the pads are mounted in the outer ring or Inland, these also ensure that the balls remain at substantially equal distances from each other as usually the cage of a bidirectional type ball bearing.

La surface extérieure 8 de la bague 7 est centrée sur l'axe A. Sa surface intérieure 9, en revanche, est excentrique par rapport à l'axe A, comme cela est bien visible sur les figures 1 et 3. Une bague 10 est montée à l'intérieur de la bague 7 par l'intermédiaire d'un troisième roulement à billes 11. Les surfaces extérieure et intérieure de la bague 10 sont coaxiales à la surface intérieure 9 de la bague 7, donc excentriques par rapport à l'axe A. La bague 10 porte une denture intérieure 12 qui peut être monobloc avec la bague 10 ou sous la forme d'une pièce rapportée, comme représenté à la figure 1. La denture intérieure 12 engrène avec deux roues coaxiales 13, 14 centrées sur l'axe A. La roue 13 est fixe par rapport au support 4. La roue 14, elle, est mobile par rapport au support 4 et solidaire en rotation d'une roue de sortie 15 qui est montée sur le support 4 par l'intermédiaire d'un quatrième roulement à billes 16 ou, en variante, par l'intermédiaire d'un palier lisse. La roue de sortie 15 engrène avec la roue 17a d'un mobile de réduction dont le pignon 17b engrène avec et entraîne un rochet de barillet 18 pour armer le ressort dudit barillet.The outer surface 8 of the ring 7 is centered on the axis A. Its inner surface 9, on the other hand, is eccentric with respect to the axis A, as is clearly visible on the figures 1 and 3 . A ring 10 is mounted inside the ring 7 via a third ball bearing 11. The outer and inner surfaces of the ring 10 are coaxial with the inner surface 9 of the ring 7, so eccentric by relative to the axis A. The ring 10 carries an internal toothing 12 which can be integral with the ring 10 or in the form of an insert, as shown in FIG. figure 1 . The internal toothing 12 meshes with two coaxial wheels 13, 14 centered on the axis A. The wheel 13 is fixed relative to the support 4. The wheel 14, it is movable relative to the support 4 and integral in rotation with a output wheel 15 which is mounted on the support 4 by means of a fourth ball bearing 16 or, alternatively, via a sliding bearing. The output wheel 15 meshes with the wheel 17a of a reduction gear whose pinion 17b meshes with and drives a barrel ratchet 18 to arm the spring of said barrel.

L'ensemble comprenant la bague 7 (plus précisément sa surface intérieure 9), la bague 10, les roues fixe et mobile 13, 14 et la roue de sortie 15 constitue un réducteur servant à augmenter le couple fourni au rochet de barillet 18 et dont la bague 7 forme l'entrée et la roue 15 la sortie. Le réducteur est montré en vue de dessus à la figure 3. La rotation de la bague 7 commande le mouvement de la bague 10 en imposant à cette dernière de rouler sans glissement sur la roue fixe 13, faisant ainsi décrire à chaque point du cercle primitif de la bague 10 une péricycloïde. Pour ce faire, à un instant donné, la partie 7a de la bague 7 dont la distance radiale entre la surface extérieure 8 et la surface intérieure 9 est la plus grande met la partie radialement adjacente 10a de la bague 10 en contact avec les dentures des roues fixe et mobile 13, 14. De la sorte, les dents 12 de la bague 10 engrènent successivement avec les dents de la roue fixe 13, les pas de leurs dentures respectives étant sensiblement identiques. La roue mobile 14 a le même diamètre primitif que la roue fixe 13 mais un nombre de dents légèrement différent. L'égalité des diamètres primitifs des roues fixe 13 et mobile 14 est pratiquement réalisable en admettant une légère différence de pas de leur denture. Le roulement de la bague 10 sur la roue fixe 13 entraîne donc la roue mobile 14 en rotation autour de l'axe A par l'engrènement entre la bague 10 et la roue mobile 14, les pas de leurs dentures respectives étant, eux aussi, sensiblement égaux. La vitesse de rotation de la roue mobile 14, à la sortie du réducteur, est très inférieure à celle de la bague 7, à l'entrée du réducteur. Typiquement, le nombre de dents N1 de la roue mobile 14 diffère du nombre de dents N2 de la roue fixe 13 de seulement une ou deux dents, ce qui permet à la denture intérieure 12 d'engrener simultanément avec ces deux roues et offre un grand rapport de réduction. Le rapport de réduction entre la vitesse angulaire de la bague 7 et la vitesse angulaire de la roue mobile 14 est égal à N2 / (N2 - N1). Dans un exemple de réalisation, la denture intérieure 12 de la bague 10 comporte 52 dents, la denture de la roue fixe 13 comporte 50 dents et la denture de la roue mobile 14 comporte 48 ou 49 dents, ce qui fait un rapport de réduction de 25 ou 50, respectivement. Comme le mobile de réduction 17a-17b effectue une démultiplication supplémentaire d'un facteur 2, le couple fourni au rochet de barillet 18 est 50 ou 100 fois supérieur au couple produit par la masse oscillante 1.The assembly comprising the ring 7 (more precisely its inner surface 9), the ring 10, the fixed and movable wheels 13, 14 and the output wheel 15 constitutes a reducer used to increase the torque supplied to the barrel ratchet 18 and of which the ring 7 forms the inlet and the wheel 15 the outlet. The reducer is shown in top view at the figure 3 . The rotation of the ring 7 controls the movement of the ring 10 by requiring the latter to roll without sliding on the fixed wheel 13, thereby describing at each point of the pitch circle of the ring 10 a pericycloid. To do this, at a given moment, part 7a of the ring 7 whose radial distance between the outer surface 8 and the inner surface 9 is the largest radially adjacent portion 10a of the ring 10 in contact with the teeth of the fixed and movable wheels 13, 14. In this way, the teeth 12 of the ring 10 meshes successively with the teeth of the fixed wheel 13, the steps of their respective teeth being substantially identical. The moving wheel 14 has the same pitch diameter as the fixed wheel 13 but a slightly different number of teeth. The equality of the pitch diameters of the fixed wheels 13 and mobile 14 is practically achievable by admitting a slight difference in pitch of their teeth. The bearing of the ring 10 on the fixed wheel 13 thus drives the mobile wheel 14 in rotation about the axis A by meshing between the ring 10 and the moving wheel 14, the steps of their respective teeth being, too, substantially equal. The rotational speed of the moving wheel 14, at the output of the gearbox, is much lower than that of the ring 7, at the input of the gearbox. Typically, the number of teeth N1 of the mobile wheel 14 differs from the number of teeth N2 of the fixed wheel 13 of only one or two teeth, which allows the internal toothing 12 to mesh simultaneously with these two wheels and offers a large reduction ratio. The reduction ratio between the angular speed of the ring 7 and the angular velocity of the moving wheel 14 is equal to N 2 / (N 2 -N 1). In an exemplary embodiment, the internal toothing 12 of the ring 10 has 52 teeth, the toothing of the fixed wheel 13 has 50 teeth and the toothing of the movable wheel 14 has 48 or 49 teeth, which makes a reduction ratio of 25 or 50, respectively. As the reduction gear 17a-17b performs an additional reduction by a factor of 2, the torque supplied to the barrel ratchet 18 is 50 or 100 times greater than the torque produced by the oscillating weight 1.

Dans des variantes, la denture intérieure 12 de la bague 10 et les dentures des roues 13, 14 pourraient être agencées différemment en termes de diamètres et de nombres de dents. Par exemple, les roues 13, 14 pourraient être identiques (même diamètre, même nombre de dents) et la bague 10 pourrait porter deux dentures intérieures superposées ayant des nombres de dents différents. Les roues 13, 14 pourraient aussi avoir des diamètres différents et engrener avec des dentures intérieures respectives de la bague 10. L'homme du métier comprendra que de nombreuses possibilités existent pour faire rouler la ou une denture intérieure de la bague 10 sur la denture de la roue fixe 13 et entraîner ainsi la roue mobile 14 par l'engrènement simultané entre la ou une autre denture intérieure de la bague 10 et la denture de la roue mobile 14.In variants, the internal teeth 12 of the ring 10 and the teeth of the wheels 13, 14 could be arranged differently in terms of diameters and numbers of teeth. For example, the wheels 13, 14 could be identical (same diameter, same number of teeth) and the ring 10 could carry two superposed internal teeth having different numbers of teeth. The Wheels 13, 14 could also have different diameters and mesh with respective internal teeth of the ring 10. The skilled person will understand that there are many possibilities for rolling the or an internal toothing of the ring 10 on the teeth of the fixed wheel 13 and thus drive the mobile wheel 14 by the simultaneous meshing between the or other internal toothing of the ring 10 and the toothing of the mobile wheel 14.

Par ailleurs, pour obtenir l'effet recherché, différents profils de dents peuvent être employés. La figure 3 montre un exemple de réalisation dans lequel la denture intérieure 12 de la bague 10 et les dentures des roues 13, 14 ont un profil triangulaire. La figure 4 montre un autre exemple de réalisation dans lequel la denture intérieure 12 de la bague 10 et les dentures des roues 13, 14 ont un profil en développante de cercle.Moreover, to obtain the desired effect, different tooth profiles can be used. The figure 3 shows an exemplary embodiment in which the internal toothing 12 of the ring 10 and the teeth of the wheels 13, 14 have a triangular profile. The figure 4 shows another embodiment in which the internal toothing 12 of the ring 10 and the teeth of the wheels 13, 14 have a involute profile of a circle.

Le dispositif de remontage automatique selon l'invention est très compact car il ne nécessite pas d'utiliser un train d'engrenages de réduction ni des pignons satellites. De plus, comme l'entraînement de la roue mobile 14 est effectué par une bague rigide (la bague 10), et non pas par un ruban flexible comme dans le document EP 2.302.468 , un meilleur rendement est assuré.The automatic winding device according to the invention is very compact because it does not require the use of a gear reduction gears or satellite gears. In addition, as the drive of the moving wheel 14 is performed by a rigid ring (the ring 10), and not by a flexible tape as in the document EP 2,302,468 , a better return is assured.

La présente invention a été décrite ci-dessus à titre d'exemple uniquement. Il va de soi que des modifications pourraient être faites sans sortir du cadre de l'invention revendiquée. Par exemple, le roulement à billes unidirectionnel 6 pourrait être remplacé par un autre type de dispositif de transmission unidirectionnel, tel qu'un dispositif d'embrayage à cliquet. De plus, le dispositif de transmission unidirectionnel pourrait être situé en aval du réducteur, bien que son agencement entre la masse oscillante et le réducteur soit préféré afin de minimiser l'angle mort perçu au niveau de la masse oscillante. La présente invention n'exclut pas non plus d'utiliser un deuxième dispositif de transmission unidirectionnel qui, couplé au premier, assurerait la fonction globale de redresseur. La sortie de ce redresseur constituerait alors l'entrée du dispositif de réduction tel que décrit, un tel agencement permettant de remonter le ressort de barillet dans les deux sens de rotation de la masse oscillante.The present invention has been described above by way of example only. It goes without saying that modifications could be made without departing from the scope of the claimed invention. For example, the unidirectional ball bearing 6 could be replaced by another type of unidirectional transmission device, such as a ratchet clutch device. In addition, the unidirectional transmission device could be located downstream of the gearbox, although its arrangement between the oscillating weight and the gearbox is preferred to minimize the dead angle perceived at the oscillating weight. The present invention also does not exclude the use of a second unidirectional transmission device which, coupled with the first, would provide the overall function of the rectifier. The output of this rectifier would then constitute the input of the reduction device as described, a such an arrangement for raising the mainspring in both directions of rotation of the oscillating mass.

Claims (7)

  1. Automatic winding device for a timepiece, comprising an oscillating weight (1), a reducer (7, 10-15) for transmitting the motion of the oscillating weight (1) to a barrel spring and a unidirectional transmission device (6) for transmitting said motion in one direction only, the reducer comprising an entry member (7), a fixed wheel (13), a mobile wheel (14) coaxial to the fixed wheel (13), an exit member (15) kinematically connected to the mobile wheel (14) and a driving member (10) controlled by the entry member (7), the driving member (10) surrounding the fixed and mobile wheels (13, 14) and meshing with them to rotate the mobile wheel (14), characterised in that the driving member (10) is a rigid ring eccentrically placed relative to the fixed and mobile wheels (13, 14) and arranged to roll without sliding on the fixed wheel (13).
  2. Automatic winding device according to claim 1, characterised in that the fixed and mobile wheels (13, 14) have a same diameter and a different number of teeth.
  3. Automatic winding device according to claim 2, characterised in that the fixed and mobile wheels (13, 14) mesh with a same inner toothing (12) of the driving member (10).
  4. Automatic winding device according to any one of claims 1 to 3, characterised in that the entry member (7) is a ring surrounding the driving member (10), wherein the outer surface (8) of said ring is coaxial to the fixed and mobile wheels (13, 14) and the inner surface (9) of said ring is eccentric relative to the fixed and mobile wheels (13, 14).
  5. Automatic winding device according to any one of claims 1 to 4, characterised in that the exit member (15) is a wheel that is rigidly connected to the mobile wheel (14).
  6. Automatic winding device according to any one of claims 1 to 5, characterised in that the unidirectional transmission device (6) is located between the oscillating weight (1) and the reducer (7, 10-15).
  7. Automatic winding device according to any one of claims 1 to 6, characterised in that the unidirectional transmission device (6) is a unidirectional ball bearing.
EP13004864.8A 2013-10-10 2013-10-10 Automatic winding device for a timepiece Active EP2860590B1 (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
EP13004864.8A EP2860590B1 (en) 2013-10-10 2013-10-10 Automatic winding device for a timepiece

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EP2860590A1 EP2860590A1 (en) 2015-04-15
EP2860590B1 true EP2860590B1 (en) 2016-04-06

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1542237A (en) * 1967-11-03 1968-10-11 Charles Tissot & Fils S A One-way clutch, especially for clockwork movements
CH699325A2 (en) * 2008-08-14 2010-02-15 Temps Fab Du Movement timepiece a device for winding board.
CH701883A1 (en) 2009-09-24 2011-03-31 Mps Micro Prec Systems Ag Coupling device.
CH702590B1 (en) 2010-01-26 2015-03-13 Mps Micro Prec Systems Ag automatic winding system.
CA2791210C (en) 2010-03-01 2019-10-29 Shell Internationale Research Maatschappij B.V. An epoxidation catalyst, a process for preparing the catalyst, and a process for the production of an olefin oxide

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