EP0482443B1 - Braking device for a gear-wheel - Google Patents

Braking device for a gear-wheel Download PDF

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Publication number
EP0482443B1
EP0482443B1 EP91117333A EP91117333A EP0482443B1 EP 0482443 B1 EP0482443 B1 EP 0482443B1 EP 91117333 A EP91117333 A EP 91117333A EP 91117333 A EP91117333 A EP 91117333A EP 0482443 B1 EP0482443 B1 EP 0482443B1
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EP
European Patent Office
Prior art keywords
wheel
braking device
toothed wheel
forming element
brake
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 - Lifetime
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EP91117333A
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German (de)
French (fr)
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EP0482443A1 (en
Inventor
Cyril Vuilleumier
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.)
ETA SA Manufacture Horlogere Suisse
Ebauchesfabrik ETA AG
Original Assignee
Ebauchesfabrik ETA AG
Eta SA Fabriques dEbauches
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Publication of EP0482443A1 publication Critical patent/EP0482443A1/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
    • G04B35/00—Adjusting the gear train, e.g. the backlash of the arbors, depth of meshing of the gears
    • 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
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/001—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power
    • G04B11/003—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power with friction member, e.g. with spring action
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G04F7/0823—Watches or clocks with stop devices, e.g. chronograph with couplings between the chronograph mechanism and the base movement
    • G04F7/0833—Watches or clocks with stop devices, e.g. chronograph with couplings between the chronograph mechanism and the base movement acting perpendicular to the plane of the movement

Definitions

  • the present invention relates to a device for braking a wheel of a gear.
  • this type of friction device can only be used if the wheel to be braked is located directly above the bridge, and provided that there is sufficient space between this wheel and the bridge to place it these measures. Sometimes, the wheel to be braked is itself placed on top of one or more other gear wheels. It is then impossible to use the device mentioned above.
  • Braking devices which use magnetism.
  • a magnet generally made of platinum-cobalt is fixed, for example, in the bridge placed above the wheel to be braked. Under the action of this magnet, the wheel is attracted towards this bridge and its axis rubs on the bearing located in this bridge, which has the effect of braking the wheel.
  • the subject of the present invention is a device for braking a wheel of a gear comprising at least two mobiles, a first mobile comprising a toothed wheel pivoting about an axis and meshing with a second mobile comprising a second gear wheel pivoting about a second axis, parallel to said first axis.
  • This braking device comprises an elastic element forming a brake which is arranged coaxially with the first mobile.
  • the friction surface 39 is continuous, in order to ensure regular friction, it could possibly be discontinuous.
  • the brake element 1 has, in the free state, the shape of a washer curved along one of its diametrical axes here, the DD axis.
  • This washer is made of an elastic material, preferably of brass for cost reasons, but it could also be made of another elastic material. Its concavity is turned towards the clutch wheel 3. On the other hand, when it is in place, this washer is placed under stress between the ring 29 and the wheel 3, by being arbouted by its peripheral friction surface 39 on the surface of the wheel 7. Thus, regular friction is obtained and therefore good braking of the chronograph wheel 7.
  • FIG. 4 shows another embodiment of the invention.
  • the braking device is described in its application to a chronograph mechanism, in which the ring 29 plays both, the role of the clutch ring and of the member holding the brake element in place.
  • the invention is not limited to this particular application.
  • it can be used advantageously in all cases where in a gear (of a simple watch, for example), it is desirable to apply a braking force to one of the wheels in order to compensate for the frolicking of gear.
  • the brake forming element will be simply mounted around the axis of one of the wheels while being held against the latter by a simple fixing ring.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • Electromechanical Clocks (AREA)
  • Braking Arrangements (AREA)
  • Gear Transmission (AREA)
  • Gears, Cams (AREA)

Abstract

The present invention relates to a braking agent for a gear-wheel. The aim of the invention is to brake the last wheel of a gear-train in order to prevent the latter rotating by unequal angular steps. <??>This aim is achieved with the aid of an element forming the brake (1) fixed on a first runner (gear) (2) of a gear-train so as to be driven in rotation by the latter, this element (1) having at its periphery a friction surface (39) bearing elastically on a second runner (gear) (6) engaging with the first, in order to brake this second runner (gear) (6). <??>The invention applies more particularly to watch-making gears and to chronographs. <IMAGE>

Description

La présente invention concerne un dispositif de freinage d'une roue d'un engrenage.The present invention relates to a device for braking a wheel of a gear.

On sait que dans les engrenages, il est souhaitable de prévoir un certain nombre d'ébats, et notamment des ébats d'engrenage, ou jeux entre les dents des roues respectivement menantes et menées. Ces ébats d'engrenage sont nécessaires, d'une part, en raison des tolérances de fabrication, et d'autre part, parce qu'ils évitent que les deux roues ne se coincent lors de leur rotation. Toutefois, à cause de ces ébats d'engrenage, la roue menée tourne parfois par saccades. Ceci est encore plus accentué lorsqu'il s'agit de la dernière roue d'un train d'engrenage qui en comporte plusieurs.We know that in gears, it is desirable to provide a certain number of fractions, and in particular gear frolics, or clearances between the teeth of the driving and driven wheels respectively. These gear fractions are necessary, on the one hand, because of the manufacturing tolerances, and on the other hand, because they prevent the two wheels from jamming during their rotation. However, because of these gear frolics, the driven wheel sometimes turns in jerks. This is even more accentuated when it is the last wheel of a gear train which comprises several.

Dans l'horlogerie, ce problème est crucial dans la mesure où l'utilisateur d'une montre peut s'apercevoir que l'une des aiguilles avance par à-coups. Ceci peut être le cas par exemple pour l'aiguille des secondes lorsque celle-ci est fixée sur la dernière roue d'un train d'engrenages. S'il s'agit d'une montre sans complications, l'utilisateur a l'impression que la roue des secondes tourne de façon irrégulière et s'il s'agit d'une montre chronographe que le temps affiché est imprécis.In watchmaking, this problem is crucial insofar as the user of a watch can perceive that one of the hands advances in spurts. This can be the case, for example, for the second hand when it is fixed to the last wheel of a gear train. If it is a watch without complications, the user has the impression that the seconds wheel turns irregularly and if it is a chronograph watch that the time displayed is imprecise.

Afin de remédier à ces inconvénients, on a déjà proposé, tel que décrit dans le brevet suisse CH 506 824, un dispositif produisant une friction sur un élément rotatif d'un mouvement de chronographe. Plus précisément, on dispose un ressort sous une roue de chronographe qui est portée par un arbre dont elle est solidaire. Ce ressort comprend une partie annulaire qui est coaxiale audit arbre, ainsi que deux bras diamétralement opposés et fixés à leurs extrémités libres sur un pont. Il exerce ainsi une force axiale sur la roue de chronographe pour empêcher le rebattement de l'aiguille du chronographe.In order to overcome these drawbacks, a device has already been proposed, as described in Swiss patent CH 506 824, producing friction on a rotary element of a chronograph movement. More specifically, there is a spring under a chronograph wheel which is carried by a shaft to which it is integral. This spring comprises an annular part which is coaxial with said shaft, as well as two diametrically opposite arms and fixed at their free ends on a bridge. It thus exerts an axial force on the chronograph wheel to prevent the chronograph hand from beating.

Toutefois, ce type de dispositif à friction ne peut être utilisé que si la roue devant être freinée se trouve directement au-dessus du pont, et à condition que l'on dispose d'un emplacement suffisant entre cette roue et le pont pour y placer ce dispositif. Or parfois, la roue que l'on souhaite freiner est placée elle-même au-dessus d'une ou de plusieurs autres roues d'engrenage. Il est alors impossible d'utiliser le dispositif évoqué précédemment.However, this type of friction device can only be used if the wheel to be braked is located directly above the bridge, and provided that there is sufficient space between this wheel and the bridge to place it these measures. Sometimes, the wheel to be braked is itself placed on top of one or more other gear wheels. It is then impossible to use the device mentioned above.

On connaît également des dispositifs de freinage utilisant le magnétisme. Dans ce cas, un aimant généralement en platine-cobalt est fixé par exemple, dans le pont placé au-dessus de la roue à freiner. Sous l'action de cet aimant, la roue est attirée vers ce pont et son axe frotte sur le palier situé dans ce pont, ce qui a pour effet de freiner la roue.Braking devices are also known which use magnetism. In this case, a magnet generally made of platinum-cobalt is fixed, for example, in the bridge placed above the wheel to be braked. Under the action of this magnet, the wheel is attracted towards this bridge and its axis rubs on the bearing located in this bridge, which has the effect of braking the wheel.

Toutefois, les aimants en platine-cobalt sont coûteux et cette technique nécessite l'emploi d'engrenages réalisés dans un matériau à perméabilité magnétique.However, platinum-cobalt magnets are expensive and this technique requires the use of gears made of a material with magnetic permeability.

En conséquence, l'invention a pour but de remédier aux inconvénients précédemment cités de la technique antérieure en fournissant un dispositif de freinage d'une roue d'engrenage peu coûteux et pouvant s'adapter sur n'importe quel type d'engrenage.Consequently, the object of the invention is to remedy the previously cited drawbacks of the prior art by providing a braking device for a gear wheel which is inexpensive and can be adapted to any type of gear.

A cet effet, la présente invention a pour objet un dispositif de freinage d'une roue d'un engrenage comprenant au moins deux mobiles, un premier mobile comprenant une roue dentée pivotant autour d'un axe et engrenant avec un second mobile comprenant une seconde roue dentée pivotant autour d'un second axe, parallèle audit premier axe. Ce dispositif de freinage comprend un élément élastique formant frein qui est disposé coaxialement au premier mobile.To this end, the subject of the present invention is a device for braking a wheel of a gear comprising at least two mobiles, a first mobile comprising a toothed wheel pivoting about an axis and meshing with a second mobile comprising a second gear wheel pivoting about a second axis, parallel to said first axis. This braking device comprises an elastic element forming a brake which is arranged coaxially with the first mobile.

Selon les caractéristiques de l'invention, premièrement, l'élément formant frein est associé audit premier mobile de façon à être entraîné en rotation par celui-ci, deuxièmement, cet élément formant frein présente à sa périphérie une surface de friction et troisièmement, la position axiale dudit élément formant frein par rapport audit premier axe est choisie par rapport à la position axiale de la seconde roue, de manière telle que, dans la zone d'engrènement des mobiles, la partie correspondante de ladite surface de friction soit en appui élastique contre l'une des faces de ladite seconde roue, de façon à freiner celle-ci.According to the characteristics of the invention, firstly, the brake element is associated with said first mobile so as to be driven in rotation by the latter, secondly, this brake element has at its periphery a friction surface and thirdly, the axial position of said brake element with respect to said first axis is chosen with respect to the axial position of the second wheel, so that, in the engagement zone of the mobiles, the corresponding part of said friction surface is in elastic support against one of the faces of said second wheel, so as to brake the latter.

Grâce à ces caractéristiques de l'invention, on peut disposer l'élément formant frein directement sur le premier mobile et fixer cet élément sur celui-ci. Il n'est plus nécessaire de prévoir une fixation sur le pont.Thanks to these characteristics of the invention, the brake element can be placed directly on the first mobile and fix this element thereon. It is no longer necessary to provide a fixing on the deck.

Selon l'invention, l'élément formant frein a, à l'état libre, la forme d'une rondelle cintrée selon l'un de ses axes diamétraux et dont la cavité est dirigée vers la première roue dentée sur laquelle elle est fixée.According to the invention, the brake element has, in the free state, the shape of a washer curved along one of its diametrical axes and the cavity of which is directed towards the first toothed wheel on which it is fixed.

Ainsi, cette rondelle forme un ressort et permet d'accroître la force de frottement exercée par la surface de friction sur la seconde roue, qui doit être freinée.Thus, this washer forms a spring and makes it possible to increase the friction force exerted by the friction surface on the second wheel, which must be braked.

Enfin, on notera que l'élément formant frein est réalisé de préférence en laiton. Ainsi, on réalise un dispositif de freinage peu coûteux à fabriquer.Finally, note that the brake element is preferably made of brass. Thus, a braking device is produced which is inexpensive to manufacture.

L'invention sera mieux comprise à la lecture de la description suivante, donnée à titre d'exemple illustratif et non limitatif, cette description étant faite en liaison avec les dessins joints dans lesquels :

  • la figure 1 représente une vue en coupe du dispositif de freinage selon l'invention, monté sur l'une des roues d'un train d'engrenage d'un chronographe,
  • la figure 2 représente une vue partielle prise selon la ligne II-II de la figure 1,
  • la figure 3 représente une vue éclatée en perspective et en coupe du dispositif de freinage avant son montage sur la roue d'engrenage, l'élément formant frein étant coupé dans l'axe selon lequel il est cintré,
  • la figure 4 représente un autre mode de réalisation du dispositif de freinage selon l'invention, l'élément formant frein étant monté de façon différente que sur les figures 1 à 3,
  • la figure 5 est une vue schématique d'une variante de réalisation de l'invention, prise dans une direction opposée à celle de la figure 2.
The invention will be better understood on reading the following description, given by way of illustrative and nonlimiting example, this description being made in conjunction with the accompanying drawings in which:
  • FIG. 1 represents a sectional view of the braking device according to the invention, mounted on one of the wheels of a gear train of a chronograph,
  • FIG. 2 represents a partial view taken along line II-II of FIG. 1,
  • FIG. 3 represents an exploded perspective view in section of the braking device before it is mounted on the gear wheel, the brake element being cut in the axis along which it is bent,
  • FIG. 4 represents another embodiment of the braking device according to the invention, the brake element being mounted differently than in FIGS. 1 to 3,
  • FIG. 5 is a schematic view of an alternative embodiment of the invention, taken in a direction opposite to that of FIG. 2.

Comme illustré en figure 1, le dispositif de freinage 1 selon l'invention est utilisé dans un train d'engrenages, destiné à équiper notamment une pièce d'horlogerie telle qu'un chronographe. Ce train d'engrenages comprend au moins deux mobiles, à savoir un premier mobile 2 comprenant une roue dentée 3 pivotant autour d'un axe 5 et engrenant avec un second mobile 6 comprenant une roue dentée 7 pivotant elle-même autour d'un axe 9 parallèle au premier axe 5. De préférence, le dispositif de freinage 1 est associé à la première roue 3, qui est ici une roue menante et il permet de freiner la seconde roue 7 qui est menée. Toutefois, on pourrait également associer ce dispositif de freinage à la roue menée et agir sur la roue menante, sous réserve que la roue menée ait un diamètre suffisamment important et que la roue menante soit suffisamment épaisse pour éviter de se déformer sous l'action dudit élément formant frein. Dans le cas d'un chronographe représenté à titre d'exemple en figure 1, la seconde roue 7 est une roue de chronographe et l'axe 9 porte l'aiguille de chronographe 11, tandis que la première roue 3 est une roue d'embrayage. Les deux roues 3 et 7 sont disposées de façon classique entre un pont 13 et une platine 15. L'axe 5 est maintenu entre un palier supérieur 17 monté dans le pont 13 et un palier inférieur 19 monté dans la platine 15. La roue d'embrayage 3 est disposée autour d'un noyau d'embrayage 21 muni d'un alésage axial 23 prévu pour le passage du premier axe 5. Ce noyau d'embrayage pourrait également être le moyeu de la roue dans le cas d'une simple roue d'engrenage.As illustrated in FIG. 1, the braking device 1 according to the invention is used in a gear train, intended in particular to equip a timepiece such as a chronograph. This gear train comprises at least two mobiles, namely a first mobile 2 comprising a toothed wheel 3 pivoting about an axis 5 and meshing with a second mobile 6 comprising a toothed wheel 7 pivoting itself around an axis 9 parallel to the first axis 5. Preferably, the braking device 1 is associated with the first wheel 3, which is here a driving wheel and it makes it possible to brake the second wheel 7 which is driven. However, one could also associate this braking device with the driven wheel and act on the driving wheel, provided that the driven wheel has a sufficiently large diameter and that the driving wheel is sufficiently thick to avoid deformation under the action of said brake element. In the case of a chronograph shown by way of example in FIG. 1, the second wheel 7 is a chronograph wheel and the axis 9 carries the chronograph hand 11, while the first wheel 3 is a clutch. The two wheels 3 and 7 are conventionally arranged between a bridge 13 and a plate 15. The axis 5 is held between an upper bearing 17 mounted in the bridge 13 and a lower bearing 19 mounted in the plate 15. The wheel d clutch 3 is arranged around a clutch core 21 provided with an axial bore 23 provided for the passage of the first axis 5. This clutch core could also be the hub of the wheel in the case of a simple gear wheel.

Comme décrit plus en détail, par exemple, dans le brevet CH 661 404, ce noyau d'embrayage 21 comprend une gorge annulaire 25 dans laquelle s'engagent les branches d'une fourche d'embrayage 27. En outre, autour du noyau d'embrayage 21 et sous la roue 3 est montée une bague d'embrayage 29. Enfin, une troisième roue 31, dite roue intermédiaire est montée sur l'axe 5 et sous la bague 29.As described in more detail, for example, in patent CH 661 404, this clutch core 21 comprises an annular groove 25 in which the arms of a clutch fork 27 engage. In addition, around the core d clutch 21 and under the wheel 3 is mounted a clutch ring 29. Finally, a third wheel 31, called the intermediate wheel is mounted on the axle 5 and under the ring 29.

Cette roue intermédiaire 31 est entraînée par une quatrième roue, généralement une roue des secondes, (non représentée sur la figure 1).This intermediate wheel 31 is driven by a fourth wheel, generally a seconds wheel, (not shown in Figure 1).

Enfin, on notera que de façon classique, le noyau d'embrayage 21 est surmonté d'un ressort 33 s'appuyant contre une butée 35 chassée sur l'axe 5.Finally, it will be noted that in a conventional manner, the clutch core 21 is surmounted by a spring 33 pressing against a stop 35 driven out on the axis 5.

Lorsque le noyau d'embrayage 21 est débrayé, c'est-à-dire lorsque la fourche 27 le soulève à l'encontre de la force du ressort 33, la roue intermédiaire 31 qui est en permanence en prise avec la roue des secondes (non représentée), n'entraîne pas la roue d'embrayage 3. Au contraire, lorsque le noyau d'embrayage 21 est embrayé (position basse), la bague 29 vient en contact de pression avec la roue intermédiaire 31 et en conséquence, la roue d'embrayage 3 est entraînée en rotation, entraînant à son tour la roue de chronographe 7. Celle-ci se trouve donc être la dernière roue d'un train d'engrenages. En conséquence, on comprend que du fait des ébats d'engrenage existant notamment entre cette roue de chronographe 7 et la roue d'embrayage 3, l'aiguille de chronographe 11 risque de tourner de façon irrégulière, si on ne prend pas de précautions particulières.When the clutch core 21 is disengaged, that is to say when the fork 27 lifts it against the force of the spring 33, the intermediate wheel 31 which is permanently engaged with the seconds wheel ( not shown), does not drive the clutch wheel 3. On the contrary, when the clutch core 21 is engaged (low position), the ring 29 comes into pressure contact with the intermediate wheel 31 and consequently, the clutch wheel 3 is rotated, in turn driving the chronograph wheel 7. This therefore happens to be the last wheel of a gear train. Consequently, it is understood that because of the gear lattices existing in particular between this chronograph wheel 7 and the clutch wheel 3, the chronograph hand 11 may turn irregularly, if no special precautions are taken .

Le dispositif de freinage 1 est justement utilisé pour empêcher ceci.The braking device 1 is precisely used to prevent this.

Comme on peut le voir en figure 1, le dispositif de freinage selon l'invention comprend un élément 1 formant frein disposé coaxialement à la roue dentée d'embrayage 3 de façon à être entraînée en rotation par celle-ci. A cet effet, l'élément formant frein 1 est muni d'une ouverture circulaire centrale 37 (voir également figure 3) et est maintenu autour du noyau d'embrayage 21 sous la roue d'embrayage 3.As can be seen in Figure 1, the braking device according to the invention comprises a member 1 forming a brake arranged coaxially with the clutch gear 3 so as to be driven in rotation by the latter. To this end, the brake element 1 is provided with a central circular opening 37 (see also FIG. 3) and is held around the clutch core 21 under the clutch wheel 3.

Lorsqu'il est à l'état libre, l'élément formant frein revêt la forme d'une rondelle cintrée selon l'un de ses axes diamétraux, mais lorsqu'il est en place (voir figure 1), il présente la forme d'un disque légèrement déformé dont le diamètre D₁ est égal ou supérieur au diamètre total D₂ (diamètre de la circonférence du sommet des dents) de la roue d'embrayage 3, de façon à définir à la périphérie de cet élément 1 une surface de friction annulaire 39 (voir figure 2). Sur cette figure, l'élément formant frein 1 dépasse la périphérie de la roue 3 afin de mieux réaliser la surface de friction annulaire 39. Toutefois, cet élément 1 pourrait être de même diamètre que la roue 3.When in the free state, the brake element takes the form of a washer curved along one of its diametrical axes, but when it is in place (see Figure 1), it has the form of '' a slightly deformed disc whose diameter D₁ is equal to or greater than the total diameter D₂ (diameter of the circumference of the top of the teeth) of the clutch wheel 3, so as to define at the periphery of this element 1 a friction surface annular 39 (see Figure 2). In this figure, the brake element 1 exceeds the periphery of the wheel 3 in order to better produce the annular friction surface 39. However, this element 1 could be of the same diameter as the wheel 3.

La périphérie de l'élément formant frein est appuyée contre la roue 3 dont la planche se trouve pratiquement en contact avec toute la surface de la rondelle 1. La surface de friction 39 est en contact avec une partie de la périphérie de la face inférieure de la roue de chronographe 7 et freine celle-ci par frottement. On assure ainsi que la roue 7 effectue toujours des pas angulaires égaux au cours de la marche du chronographe.The periphery of the brake element is pressed against the wheel 3, the board of which is practically in contact with the entire surface of the washer 1. The friction surface 39 is in contact with part of the periphery of the lower face of the chronograph wheel 7 and brakes it by friction. This ensures that the wheel 7 always takes equal angular steps during the running of the chronograph.

On notera également que si de préférence la surface de friction 39 est continue, afin d'assurer un frottement régulier, elle pourrait éventuellement être discontinue.It will also be noted that if preferably the friction surface 39 is continuous, in order to ensure regular friction, it could possibly be discontinuous.

La figure 3 illustre les différentes pièces avant leur montage dans l'ensemble représenté aux figures 1 et 2.FIG. 3 illustrates the various parts before their assembly in the assembly represented in FIGS. 1 and 2.

Sur cette figure 3, on constate que selon un mode de réalisation préféré de l'invention, l'élément formant frein 1 a, à l'état libre, la forme d'une rondelle cintrée selon l'un de ses axes diamétraux ici, l'axe D-D. Cette rondelle est réalisée en un matériau élastique, en laiton de préférence pour des raisons de prix de revient, mais elle pourrait également être réalisée dans un autre matériau élastique. Sa concavité est tournée vers la roue d'embrayage 3. Par contre, lorsqu'elle est en place, cette rondelle est mise sous contrainte entre la bague 29 et la roue 3, en s'arcboutant par sa surface périphérique de friction 39 sur la surface de la roue 7. Ainsi, on obtient un frottement régulier et donc un bon freinage de la roue de chronographe 7.In this FIG. 3, it can be seen that according to a preferred embodiment of the invention, the brake element 1 has, in the free state, the shape of a washer curved along one of its diametrical axes here, the DD axis. This washer is made of an elastic material, preferably of brass for cost reasons, but it could also be made of another elastic material. Its concavity is turned towards the clutch wheel 3. On the other hand, when it is in place, this washer is placed under stress between the ring 29 and the wheel 3, by being arbouted by its peripheral friction surface 39 on the surface of the wheel 7. Thus, regular friction is obtained and therefore good braking of the chronograph wheel 7.

La figure 4 montre un autre mode de réalisation de l'invention.Figure 4 shows another embodiment of the invention.

Alors que sur les précédentes figures, l'élément formant frein est fait à partir d'une rondelle élastique dont la concavité est tournée vers la roue 3, et qui est maintenue appliquée contre cette roue, l'élément formant frein de la figure 4 est un disque 1A qui est monté librement autour du noyau d'embrayage 21 tout en étant solidaire en rotation de celui-ci. Ce disque n'est donc plus plaqué contre la roue 3.While in the previous figures, the brake element is made from an elastic washer whose concavity is turned towards the wheel 3, and which is kept pressed against this wheel, the brake element of Figure 4 is a disc 1A which is freely mounted around the clutch core 21 while being integral in rotation with the latter. This disc is therefore no longer pressed against the wheel 3.

Cet agencement permet de compenser plus facilement la différence de niveau des plans radiaux que peuvent présenter les faces des roues en prise. Ainsi comme représenté sur la figure 4, une bague d'ajustement 41 formant entretoise est montée entre la roue d'embrayage 3 et le disque 1A. L'épaisseur de cette bague est choisie en fonction de la différence de niveau entre les faces des roues 3 et 7. En d'autres termes, on choisit la position axiale de l'élément formant frein 1 en fonction de la position axiale de la seconde roue 7 de manière telle que dans la zone d'engrènement 43 des roues 3 et 7, la partie correspondante de la surface de friction 39 soit en appui élastique contre l'une des faces de ladite seconde roue 7.This arrangement makes it possible to more easily compensate for the difference in level of the radial planes that the faces of the engaged wheels can have. Thus, as shown in FIG. 4, an adjustment ring 41 forming a spacer is mounted between the clutch wheel 3 and the disc 1A. The thickness of this ring is chosen as a function of the level difference between the faces of the wheels 3 and 7. In other words, the axial position of the brake element 1 is chosen as a function of the axial position of the second wheel 7 so that in the engagement zone 43 of the wheels 3 and 7, the corresponding part of the friction surface 39 is in elastic abutment against one of the faces of said second wheel 7.

Dans les deux modes de réalisation que l'on vient de décrire (figures 1 à 3 et 4, respectivement), le dispositif de freinage est décrit dans son application à un mécanisme de chronographe, dans laquelle la bague 29 joue à la fois, le rôle de la bague d'embrayage et d'organe maintenant en place l'élément formant frein.In the two embodiments which have just been described (FIGS. 1 to 3 and 4, respectively), the braking device is described in its application to a chronograph mechanism, in which the ring 29 plays both, the role of the clutch ring and of the member holding the brake element in place.

Bien entendu, l'invention ne se limite pas à cette application particulière. Au contraire, elle peut être utilisé avantageusement dans tous les cas où dans un engrenage (d'une simple montre, par exemple), il est souhaitable d'appliquer une force de freinage à l'une des roues afin de compenser les ébats d'engrenage. Dans ce cas, l'élément formant frein sera monté simplement autour de l'axe de l'une des roues en étant maintenu contre celle-ci par une simple bague de fixation.Of course, the invention is not limited to this particular application. On the contrary, it can be used advantageously in all cases where in a gear (of a simple watch, for example), it is desirable to apply a braking force to one of the wheels in order to compensate for the frolicking of gear. In this case, the brake forming element will be simply mounted around the axis of one of the wheels while being held against the latter by a simple fixing ring.

La figure 5 représente encore un autre mode de réalisation de l'invention dans lequel le dispositif de freinage comporte un élément formant frein 1B fait à partir d'un anneau fixé sur l'une des faces de la première roue 3 par des moyens appropriés, tels que par collage, par exemple. Cet anneau 1B est coaxial à la roue 3 et présente à sa périphérie une surface de friction 39. Là encore, on notera que le diamètre externe D′₁ de cet anneau 1B est au moyen égal au diamètre D′₂ de la roue 3 sur laquelle il est fixé.FIG. 5 represents yet another embodiment of the invention in which the braking device comprises a brake forming element 1B made from a ring fixed to one of the faces of the first wheel 3 by appropriate means, such as by gluing, for example. This ring 1B is coaxial with the wheel 3 and has a friction surface 39 at its periphery. Again, it will be noted that the external diameter D′₁ of this ring 1B is by means equal to the diameter D′₂ of the wheel 3 on which it is fixed.

Un tel mode de réalisation sera de préférence utilisé dans des horloges par exemple, présentant des roues d'engrenages d'un diamètre supérieur à celui des roues utilisées habituellement dans une montre.Such an embodiment will preferably be used in clocks for example, having gear wheels with a diameter greater than that of the wheels usually used in a watch.

Claims (14)

  1. Braking device for a gear wheel of a gear train comprising at least two wheel sets, a first wheel set (2) comprising a toothed wheel (3) pivoting around a shaft (5) and meshing with a second wheel set (6) comprising a second toothed wheel (7) pivoting around a second shaft (9) parallel to said first shaft (5), such braking device comprising an elastic element forming a brake (1; 1A; 1B) which is arranged coaxial to the first wheel set (2), characterized in that the brake forming element (1; 1A; 1B) is associated with said first wheel set (2) in a manner to be driven in rotation thereby, in that the brake forming element (1; 1A; 1B) exhibits at its periphery a friction surface (39) and in that the axial position of said brake forming element (1) relative to said first shaft (5) is chosen relative to the axial position of the second toothed wheel (7) in a manner such that in the meshing zone (43) of the wheel sets (2) and (6), the corresponding portion of said friction surface (39) bears elastically against one of the faces of said second toothed wheel (7) so as to brake the latter.
  2. Braking device according to claim 1, characterized in that the friction surface (39) is continuous.
  3. Braking device according to claim 1 or 2, characterized in that the friction surface (39) is annular.
  4. Braking device according to claim 1, 2 or 3, characterized in that the outer diameter (D₁; D′₁) of the brake forming element (1) is greater than or equal to the total diameter (D₂; D′₂) of the toothed wheel (3) on which it is fixed.
  5. Braking device according to any one of the preceding claims, characterized in that the brake forming element in its released state has the form of a dish (1), the concave side of which is turned towards the first toothed wheel (3).
  6. Braking device according to one of claims 1 to 4, characterized in that the brake forming element has the form of a disc (1A).
  7. Braking device according to one of claims 1 to 4, characterized in that the brake forming element has the form of a ring (1B).
  8. Braking device according to one of claims 5 or 6, characterized in that the brake forming element (1; 1A) is provided with a circular central opening (37) and is assembled around the shaft (5) of the first toothed wheel (3).
  9. Braking device according to claim 8, characterized in that an adjustment ring (41) forming a spacer is assembled between the toothed wheel (3) and the brake forming element (1; 1A).
  10. Braking device according to claim 7, characterized in that the ring (1B) is fixed onto one of the faces of the first toothed wheel (3) by gluing.
  11. Braking device according to any one of the preceding claims, characterized in that the brake forming element (1) is fashioned in brass.
  12. Timepiece of the type comprising at least one first driving toothed wheel (3) meshing with a second toothed wheel (7) bearing a hand and driven by said first wheel (3), characterized in that it includes a braking device in accordance with any one of the preceding claims, such braking device being arranged coaxially to the first driving toothed wheel (3).
  13. Timepiece according to claim 12, characterized in that it is constituted by a chronograph watch.
  14. Timepiece according to claim 13, characterized in that the first driving toothed wheel (3) is a clutch wheel secured around a gear hub (21), in that the second driven toothed wheel (7) is a chronograph wheel bearing a chronograph hand (11) and in that the brake forming element (1) is maintained around the gear hub (21) between the clutch wheel (3) and a clutch ring (29).
EP91117333A 1990-10-22 1991-10-11 Braking device for a gear-wheel Expired - Lifetime EP0482443B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3363/90 1990-10-22
CH3363/90A CH679823B5 (en) 1990-10-22 1990-10-22

Publications (2)

Publication Number Publication Date
EP0482443A1 EP0482443A1 (en) 1992-04-29
EP0482443B1 true EP0482443B1 (en) 1994-07-13

Family

ID=4254360

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91117333A Expired - Lifetime EP0482443B1 (en) 1990-10-22 1991-10-11 Braking device for a gear-wheel

Country Status (5)

Country Link
US (1) US5253231A (en)
EP (1) EP0482443B1 (en)
JP (1) JP3105595B2 (en)
CH (1) CH679823B5 (en)
DE (1) DE69102854T2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3158401B1 (en) * 2014-06-19 2023-08-30 Rolex S.A. Clock transmission device

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JP2995675B2 (en) * 1996-10-11 1999-12-27 セイコーインスツルメンツ株式会社 Electronic clock with alarm
JP4658547B2 (en) * 2004-09-13 2011-03-23 シチズンホールディングス株式会社 Electronic clock with chronograph function
EP2053474B1 (en) 2007-10-22 2012-12-12 Omega SA Chronograph timepiece
CH704775A2 (en) * 2011-04-08 2012-10-15 Richemont Int Sa chronograph mechanism.
JP6011993B2 (en) * 2012-04-18 2016-10-25 カシオ計算機株式会社 Information display device and electronic timepiece
KR101293497B1 (en) * 2012-05-10 2013-08-07 전자부품연구원 1-axis joint module
KR101359959B1 (en) * 2012-05-10 2014-02-12 전자부품연구원 Break apparatus comprising toothed break plate and motor assembly using the same
EP2860591A1 (en) * 2013-10-09 2015-04-15 Nivarox-FAR S.A. Assembly system using a conical resilient locking member
CH715945A2 (en) 2019-03-01 2020-09-15 Rolex Sa Clockwork gear.

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FR1344794A (en) * 1963-01-22 1963-11-29 Device in particular for a chronograph, as well as chronographs provided with this device or similar device
DE6805821U (en) * 1968-11-07 1969-03-20 Diehl Nuernberg Fa TIME SWITCH FOR THE TIMING OF THE FUNCTIONS OF APPLIANCES, IN PARTICULAR COOKING STOVES.
JPS4728696Y1 (en) * 1969-02-12 1972-08-29
GB1341597A (en) * 1970-06-09 1973-12-25 Suwa Seikosha Kk Timepiece mechanism
DE8436089U1 (en) * 1984-12-10 1985-03-07 Pforzheimer Uhren-Rohwerke Porta GmbH, 7530 Pforzheim Friction connection
CH661403GA3 (en) * 1985-10-02 1987-07-31
US4794576A (en) * 1988-01-29 1988-12-27 Timex Corporation Combination electrical contact member and braking member for a timepiece

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3158401B1 (en) * 2014-06-19 2023-08-30 Rolex S.A. Clock transmission device

Also Published As

Publication number Publication date
CH679823B5 (en) 1992-10-30
DE69102854T2 (en) 1995-02-23
US5253231A (en) 1993-10-12
JP3105595B2 (en) 2000-11-06
CH679823GA3 (en) 1992-04-30
EP0482443A1 (en) 1992-04-29
JPH05157857A (en) 1993-06-25
DE69102854D1 (en) 1994-08-18

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