EP3106927A2 - Power reserve indicator for a timepiece - Google Patents

Abstract

A clockwork motor (10) enclosing a spring mounted between a drum (14) and a shaft (11) pivotally integral with a ratchet (21), having a differential (20) coaxial with the barrel, with a first input driven by the ratchet (21), a second input which is the drum (14), and a pivoting output wheel (23), coaxial with said shaft (11), arranged to constitute or drive a power reserve indicator, this differential (20) comprising balls (25) driving the output wheel (23), cooperating with an upper surface (13) of the drum (14), and with a bottom surface (26) facing it, of a board differential (22) constituting the first input, pivoting coaxially on said shaft (11) and connected to the ratchet (21) by a friction (24) cooperating with a plate (2), and the ratchet (21) constitutes the cylinder cover .

Description

Field of the invention

The invention relates to a clockwork motor comprising a barrel, pivoting about a shaft, enclosing a spring mounted between said barrel and said shaft, which carries pivotally a driving ratchet of said shaft, said motor having a differential of which a first input is driven indirectly by said ratchet and a second input is said drum, and whose output is a pivoting output wheel, coaxial with said shaft, arranged to constitute or drive a power reserve indicator, and wherein said differential comprises balls driving housing of said basket-shaped output wheel, and cooperating with an upper surface of said cylinder and with a lower surface, which is disposed on the side of said upper surface of said drum, with a differential board, which board is arranged to pivot on said shaft, coaxial with it, and is connected to said ratchet or a plate by means of friction, and which constitutes said first input.

The invention also relates to a power reserve indicator mechanism for displaying the power reserve of a clockwork motor comprising a drum consisting of a drum provided with a toothing and a lid enclosing a spring together. mounted between, on the one hand, said barrel and, on the other hand, a barrel shaft around which said barrel rotates, said barrel shaft bearing and pivotally attached to a transmission ratch outside said barrel and facing said lid, or respectively drum audit.

The invention further relates to a differential subassembly arranged to be mounted on a clock tree.

The invention also relates to a watch movement comprising at least one such motor, and / or at least one such power reserve indicator mechanism.

The invention also relates to a watch, or timepiece, comprising at least one such motor, and / or at least one such power reserve indicator mechanism.

The invention relates to the field of mechanical timepieces, particularly watches, comprising as energy source at least one spring-loaded cylinder engine.

The invention relates to the display complication of the available power reserve.

Background of the invention

The power reserve indication of a mechanical watch, powered by one or more barrels, is a useful complication for the user.

It is nevertheless uncommon, because it often requires a substantial modification of the basic movement, and this complication consumes a lot of space, both in volume and thickness. It is therefore often reserved for movements housed in fairly spacious boxes, and its generalization is difficult.

The document EP1970778 on behalf of WATCHES BREGUET SA describes a power reserve indicator comprising a planetary differential gear, of rather complex execution, of which a first input is connected to the barrel shaft, a second input to the barrel, and an output to an indicator power reserve. The frame of the differential gear is coaxial with the barrel shaft, the second input being integral with the barrel cover. The output is a ring gear, which is kinematically connected to the first input by satellites meshing with each other, and which are carried by the cover.

The document DE1015747 in the name of FELSA AG describes a similar differential, with first input is connected to the barrel shaft via a gear, a second input to the barrel, and a differential output at an output wheel which comprises housing balls or rollers interposed between the barrel and the last mobile of this cog.

Summary of the invention

The invention proposes to provide a power-reserve display device that is easy to perform by transforming an existing mechanical movement that is inexpensive and consumes the minimum of space.

For this purpose, the invention relates to a clockwork motor according to claim 1.

The invention further relates to a power reserve indicator mechanism according to claim 6.

The invention further relates to a removable single-piece differential mounting unit according to claim 16.

The invention also relates to a watch movement comprising at least one such motor, and / or at least one such power reserve indicator mechanism.

The invention also relates to a watch, or timepiece, comprising at least one such motor, and / or at least one such power reserve indicator mechanism.

Brief description of the drawings

• la figure 1 représente, de façon schématisée, en coupe passant par son axe de pivotement, un moteur d'horlogerie à barillet comportant un mécanisme différentiel coaxial à billes selon l'invention permettant la visualisation de la réserve de marche restante au niveau d'un indicateur commandé par une roue de sortie qui est la roue servant de panier aux billes du différentiel ;
• la figure 2 représente, de façon similaire, un indicateur de réserve de marche sur la base du mécanisme de la figure 1, complété avec des rouages d'armage pour la transmission de mouvement entre un rochet et une planche de différentiel servant de première entrée au différentiel à billes, la deuxième entrée étant quant à elle constituée par le barillet lui-même;
• la figure 3 représente, de façon similaire, un indicateur de réserve de marche sur la base du mécanisme de la figure 1, complété avec un rouage d'armage planétaire pour la transmission de mouvement entre un rochet et une planche de différentiel servant de première entrée au différentiel à billes, la deuxième entrée étant quant à elle constituée par le barillet lui-même;
• la figure 4 est un schéma-blocs illustrant une montre comportant un mouvement incorporant un indicateur de réserve de marche, un moteur, et un différentiel à billes coaxial selon l'invention ;
• la figure 5 représente, de façon similaire aux figures 1 à 3, mais plus schématique, un moteur d'horlogerie à barillet comportant un mécanisme différentiel coaxial à billes selon l'invention, dans lequel un rochet forme directement le couvercle du barillet ;
• la figure 6 représente, de façon similaire aux figures 1 à 3, une vue partielle d'une autre variante d'indicateur de réserve de marche, comportant un sous-ensemble différentiel amovible en un seul bloc ;
• la figure 7 représente, de façon schématisée et en perspective, un tel sous-ensemble différentiel, vu depuis un côté supérieur opposé à un côté inférieur où sont saillantes les billes ;
• la figure 8 représente, de façon schématisée et en perspective, la surface supérieure d'un barillet, et un arbre agencé pour recevoir le sous-ensemble différentiel de la figure 7.

Other features and advantages of the invention will appear on reading the detailed description which follows, with reference to the appended drawings, in which:

• the figure 1 represents, schematically, in section passing through its axis of pivoting, a clockwork clock motor comprising a coaxial ball differential mechanism according to the invention for viewing the remaining power reserve at an indicator controlled by an output wheel which is the wheel serving as a basket for the differential balls;
• the figure 2 similarly represents a power reserve indicator on the basis of the mechanism of the figure 1 , completed with gear wheels for the transmission of movement between a ratchet and a differential board serving as a first input to the ball differential, the second input being constituted by the cylinder itself;
• the figure 3 similarly represents a power reserve indicator on the basis of the mechanism of the figure 1 , completed with a planetary gear train for the transmission of movement between a ratchet and a differential board serving as a first input to the ball differential, the second input being constituted by the barrel itself;
• the figure 4 is a block diagram illustrating a watch comprising a movement incorporating a power reserve indicator, a motor, and a coaxial ball differential according to the invention;
• the figure 5 represents, similarly to Figures 1 to 3 , but more schematically, a clockwork clock motor comprising a coaxial ball differential mechanism according to the invention, wherein a ratchet directly forms the lid of the barrel;
• the figure 6 represents, similarly to Figures 1 to 3 , a partial view of another alternative power reserve indicator, comprising a removable differential subassembly in a single block;
• the figure 7 represents, schematically and in perspective, such a differential subassembly, seen from an upper side opposite a lower side where the balls are salient;
• the figure 8 represents, schematically and in perspective, the upper surface of a cylinder, and a shaft arranged to receive the differential subassembly of the figure 7 .

Detailed Description of the Preferred Embodiments

The invention relates to a power reserve display device for a mechanical timepiece, in particular a watch, comprising at least one energy source constituted by a spring-loaded barrel.

Patent applications of the same applicant, CH01102 / 14 and EP14177775.5 , describe a power-reserve indicator for displaying the power-reserve indication of a plurality of energy accumulators each comprising an indicator cooperating with an input of a differential mechanism that this indicator comprises. power reserve, and an output of this differential mechanism cooperates with a display mechanism of the total power reserve of the plurality of energy accumulators, at least two of the inputs are coaxial.

More particularly, in this prior art, the differential comprises a hub driving a carrier disc, which carries balls in contact with both a first input tray and a second input tray, which are mounted idle on this hub, under the action of friction imposed by one or more springs. The hub is still secured to an outlet in the form of a wheel which meshes with a return plate that comprises an input mobile, pivoting about another fourth pivot axis, this board being coaxial and pivotally integral. of a pinion that attacks an entry board of a power reserve display mechanism, coaxial and integral in pivoting of a shaft arranged to carry a display element such as needle, disk, or the like.

The invention described below relates to different objects according to a common inventive step: an engine comprising a barrel, an additional mechanism designed for the cheaper conversion of such an engine to add the power reserve display function, or an autonomous power reserve mechanism comprising such an engine.

The invention is described only in the simple case of a single cylinder engine, the skilled person will extrapolate, especially with the documents cited above, for a timepiece with several barrels.

In a first variant, the invention relates to a clockwork motor comprising a barrel. This barrel is of conventional type, pivoting about a shaft 11, enclosing a spring mounted between the barrel and the shaft 11, which carries pivotally a ratchet 21 for driving the shaft.

The engine 10 comprises a differential 20, coaxial with the barrel along the axis D of pivoting of the barrel which is also the axis of the shaft 11, and a first input is driven indirectly by the ratchet 21, and a second input is the barrel. The output of this differential 20 is a pivoting output wheel 23, coaxial with the shaft 11, which is arranged, or to constitute a power reserve indicator, or to drive a power reserve indicator mechanism 50, in particular and not limited to a gear train 51 or the like.

And, in a preferred embodiment, because very economical, illustrated in the figures, this differential 20 comprises balls 25, which cooperate with an upper surface 13 of the barrel and with a lower surface 26 of a differential board 22. This board of differential 22 is arranged to pivot on the shaft 11, is coaxial with it, and is connected to the ratchet 21 by a friction means 24, and which constitutes the first input. These balls 25 cause in their rotation of the housing that includes the output wheel 23 basket. This lower surface 26 is disposed on the side of the upper surface of the barrel.

More particularly, the barrel conventionally consists of a drum 14 provided with a toothing and a lid 12 enclosing the spring together. according to the configuration of the barrel assembly, the ratchet 21 faces the lid 12 as visible in the figures, or respectively to the drum 14.

The first entry for the arming is driven indirectly by the ratchet 21 and the second entry for disarming is constituted by the cover 12, or respectively by the drum 14. And the balls 25 cooperate, on the one hand with an upper surface 13 of the cover 12, or respectively of the drum 14, and secondly with the lower surface 26 of the differential board 22.

More particularly, the friction means 24 is a spring disposed between the ratchet 21 and the differential wheel 22.

In a second variant, the invention relates to a power reserve indicator mechanism 100 for displaying the power reserve of a clockwork motor comprising a barrel consisting of a drum 14 provided with a toothing and a a cover 12 enclosing together a spring mounted between on the one hand the barrel and on the other hand a barrel shaft 11 around which the barrel rotates, the barrel shaft 11 being load-bearing and pivotally integral with a transmission ratchet 21 outside the barrel and facing the lid 12, or drum 14. This is an additional mechanism, it is sufficient to add to an existing barrel assembly if it is predisposed (by adequate machining of the barrel). barrel shaft 11), or to add to an existing barrel assembly which has previously been replaced the barrel shaft 11 by a shaft adapted to receive this power reserve indicator mechanism 100.

• une planche de différentiel 22, qui est agencée pour pivoter coaxialement à l'arbre 11, cette planche de différentiel 22 étant disposée entre :
• d'un côté supérieur, un moyen d'entraînement par friction 24 agencé pour un entraînement relatif entre la planche de différentiel 22 et un rochet 21,

et, d'un côté inférieur,

• une roue de sortie 23 qui est agencée pour pivoter coaxialement à l'arbre 11, et qui constitue un panier de maintien de billes 25 que comporte encore le sous-ensemble,
• ces billes 25 étant agencées pour rouler entre une surface inférieure 26 de la planche de différentiel 22 et une surface supérieure 13 d'un couvercle 12, ou respectivement d'un tambour 14,

et où la roue de sortie 23 est agencée pour constituer ou entraîner un indicateur de réserve de marche 51 d'un moteur 10.This mechanism 100 then comprises a very small number of components, each of low unit cost. The mechanism 100 comprises a differential ball mechanism 20, which is coaxial with the barrel, and comprises a subassembly which is arranged to be interposed axially between a lid 12, or respectively a drum 14, and a ratchet 21. -Set includes:

• a differential board 22, which is arranged to pivot coaxially with the shaft 11, this differential board 22 being disposed between:
• an upper side, a friction drive means 24 arranged for a relative drive between the differential board 22 and a ratchet 21,

and, on a lower side,

• an output wheel 23 which is arranged to pivot coaxially with the shaft 11, and which constitutes a ball-holding basket 25 that still includes the subassembly,
• these balls 25 being arranged to roll between a lower surface 26 of the differential board 22 and an upper surface 13 of a cover 12, or respectively of a drum 14,

and wherein the output wheel 23 is arranged to constitute or drive a power reserve indicator 51 of a motor 10.

Naturally, the power reserve indicator mechanism 100 can integrate a motor 10 as described above.

The transmission of movement of the ratchet 21 to the differential wheel 22 requires compliance with the direction of pivoting, and may require a gear ratio or reduction: due to the principle of differential ball is a reduction in a gear report of 2.

In a third variant, a non-limiting example of which is visible on the figure 2 , the power reserve indicator mechanism 100 comprises a plate 2, which carries the motor 10. And this plate 2 carries a differential drive gear 30 meshing with the ratchet 21 and with a differential gear wheel 40 that carries also the plate 2 and which meshes with the differential board 22.

The differential drive gear train 30 comprises a differential drive gear 32, which carries a differential gear 31, which meshes directly with the ratchet 21. The toothing 33 of the differential drive gear 32 intermesh with the teeth 42 a differential wheel return 41.

In a fourth variant, visible on the figure 3 , the power reserve indicator mechanism 100 includes a plate 2 carrying the motor 10: This plate comprises at least two pivots 60, each carrying a pinion 61 having a toothing 62 meshes, on the one hand with an external toothing that comprises the differential board 22, and secondly with an internal toothing 210 that includes a ratchet 21. This fourth variant planetary gearing is, however, more expensive than the third variant with intermediate gear wheels.

The figure 5 illustrates, in a very simplified manner, to the extent that most of the components it comprises are similar to those set out above, another fifth advantageous variant, because reducing the axial size, in which the ratchet 21 directly forms the lid of the barrel, and there is naturally a game (not shown in the figure) between the ratchet 21 and the drum 14. The balls 25 then cooperate with an upper surface of the drum 14. This ratchet 21 has a toothing 211, which attacks the differential board via an ad hoc cogwheel. For example, on the figure 5 the toothing 211 cooperates with a first toothing 72 of a ratchet 71, a second gear 73 of which engages a toothing 75 of a reversing gear 74 which also meshes with the toothing 220 of the differential board 22. The means friction 24 then takes direct support on a plate 2. Naturally, the driving of the train by the drum 14 of the cylinder must then be done in another peripheral zone of the barrel.

The figure 6 illustrates a sixth variant, comprising a differential subassembly 50 removable in one block.

This differential subassembly 50 is entirely assembled on a first shoulder ring 51, arranged to be mounted axially free on a bearing 112 of the shaft 11 on which it is threaded. A first outer shoulder 52 of this first shoulder ring 51 carries the output wheel 23 of the differential free to pivot relative to the first shoulder ring 51.

As before, the outlet wheel 23 forming a basket comprises, in housings 231, balls 25 which cooperate with the upper surface 13 of the drum 12 of the barrel, and with the lower surface 26 of a differential board 22. Preferably, these housings 231 are made with a narrowing at their lower orifice, the side facing the drum 12, so as to handle the subassembly 50 equipped without losing the balls 50. This shrinkage can be obtained during the stamping of the output wheel 23, or still be achieved by a light matte or the like. After positioning the output wheel 23 equipped with its balls 25 bearing on the first outer shoulder 52, the differential board 22 is mounted which is already driven on a second shoulder ring 56, abutting on a second outer shoulder 58 that includes this second shoulder ring 56. This second shoulder ring 56 is free to pivot on the first shoulder ring 51, in particular in the non-limiting embodiment of the figure 6 a bore 57 of the second shoulder ring 56 pivots freely on an outer bearing surface 54 that includes the first shoulder ring 51.

Naturally, it is also possible to realize in a single component the second shoulder ring 56 and the differential board 22, the important thing being to separate sufficiently the ratchet 21 teeth of that of the differential board 22. The second shoulder ring 56 allows above all to use a plate 22 after stamping, much less expensive than a machined wheel.

The differential board 22 bears on the balls 25.

The differential subassembly 50 is finally capped by the ratchet 21 which is driven on the first shoulder ring 51, and bears on an upper bearing face 58 of the second shoulder ring 56.

At this stage, the differential subassembly 50 can be handled in one piece, and be returned if necessary, in particular by a robotic mounting means.

The shaft 11 advantageously comprises drive means 111, represented in a nonlimiting manner on the figure 8 by plates, arranged to cooperate with complementary drive means 511 that includes the first shoulder ring 51, as visible on the figure 7 , for their driving in pivoting one by the other, and for the reassembly of the engine 10. Of course, this pivoting drive can be achieved by any means known to those skilled in the art, directly or indirectly through a key or the like.

We still see on the figure 6 a friction means 24, of elastic washer type or the like, between the ratchet 21 and the plate 2.

The friction between the ratchet 21 and the second shoulder ring 56 carrying the differential board 22 which is thus still the first input of the differential, the second input being constituted by the barrel drum 12.

The invention also relates to such an independent differential subassembly 50, arranged to be mounted on a clockwork shaft 11, that it constitutes a removable subassembly in a single block and comprises a first shoulder ring 51, arranged to be freely mounted. axially on a bearing of a shaft 11 and integral in pivoting with this shaft 11, which first shoulder ring 51 carries, coaxial, an output wheel 23 mounted free to pivot relative to the first shoulder ring 51, this output wheel 23 constituting a basket for a plurality of balls protruding at a lower end of said differential subset 50 and arranged to roll on a surface of revolution of a mobile or barrel, this first shoulder ring 51 carrying, directly or indirectly, a differential board 22 also free to pivot on the first shoulder ring 51 and mounted in friction support on the balls 25 on the opposite side at their projecting end at the lower end, and a ratchet 21 being driven on the first shoulder ring 51 so as to frictionally drive the differential board 22 .

The invention also relates to a watch movement 200 comprising at least one such motor 10, and / or at least one such power reserve indicator mechanism 100.

The invention also relates to a watch 300, or timepiece, comprising at least one such motor 10, and / or at least one such power reserve indicator mechanism 100.

In sum, the integration of a ball differential directly on the barrel, in a coaxial manner, according to the invention, offers a useful horological complication, at an acceptable production cost, because requiring only limited transformations, and additions. simple components in small numbers.

At the level of the barrel, it is enough to modify the tree. It is no longer necessary to add a pinion integral with the cover or the drum for the drive of the differential.

The height gain compared to a standard differential is appreciable.

The saving of space in the plane is important, because the differential is coaxial with the barrel.

The cover (or drum, depending on the arrangement) of the barrel is directly used as an entrance for disarming.

The output wheel 23 of the differential can not be directly driven through the transmission ratchet 21, in fact, the latter rotating in the same direction as the barrel, the output of the differential would rotate only in one direction. This is why, according to the invention, a gear train is integrated to change the direction of pivoting. The transmission ratchet, integral with the barrel shaft, drives the differential board through a simple kinematics, in particular a gear train, with the interposition of an inverter to make up the correct direction of rotation: this is the object of the third and fourth variants, respectively double wheel, and planetary gear, which is a little more expensive but less cumbersome than the previous one. Overall gain of space remains, whatever the chosen solution, important compared to the prior art.

Claims (9)

A clockwork motor (10) comprising a barrel, pivoting about a shaft (11), enclosing a spring mounted between a drum (14) of said barrel and said shaft (11), which pivotally supports a ratchet (21) driving said shaft (11), said motor (10) having a differential (20) whose first input is driven indirectly by said ratchet (21) and a second input is said drum (14), and whose output is a pivoting output wheel (23), coaxial with said shaft (11), arranged to constitute or drive a power-reserve indicator, and wherein said differential (20) comprises balls (25) driving housing of said output wheel ( 23) and cooperating with an upper surface (13) of said cylinder and with a lower surface (26), which is arranged on the side of said upper surface (13) of said drum (14), with a differential plate ( 22), which board (22) is arranged to pivot on said shaft (11) coaxial therewith and is connected to said ratchet (21) or a plate (2) by a friction means (24) and constituting said first input, characterized in that said ratchet (21) is integrated in said cylinder which it forms a cover, and in that said differential board (22) is connected to a plate (2) by a friction means (24). Motor (10) timepiece according to claim 1, characterized in that said ratchet (21) has a ratchet toothing (211), which attacks through a gear a board toothing (220) of said board differential (22), which said board toothing (220) cooperates with a first toothing (72) of a ratchet (71), a second toothing (73) of which acts on a return teeth (75) of a reverse gear (74), which also meshes with said board toothing (220) of said differential board (22). A clockwork motor (10) comprising a barrel, pivoting about a shaft (11), enclosing a spring mounted between a drum (14) of said barrel and said shaft (11), which pivotally supports a ratchet (21) driving said shaft (11), said motor (10) having a differential (20) whose first input is driven indirectly by said ratchet (21) and a second input is said cylinder, and whose output is a wheel of pivoting outlet (23), coaxial with said shaft (11), arranged to constitute or drive a power reserve indicator (51), and wherein said differential (20) comprises balls (25) driving housing of said output wheel ( 23) forming a basket, and cooperating with an upper surface (13) of said cylinder and with a lower surface (26), which is disposed on the side of said upper surface (13) of said cylinder, of a differential board (22), which board (22) is arranged to pivot on said shaft (11) coaxial therewith and is connected to said ratchet (21) or to a plate (2) through friction means (24) and constituting said first input, characterized in that said differential (20) is a differential subassembly (50) removable in one block and which comprises a first shoulder ring (51), arranged to be mounted axially free on a bearing surface of said shaft (11) and pivotally integral with said shaft (11). ), which first shoulder ring (51) carries said output wheel (23) mounted free to pivot relative to said first shoulder ring (51), which still carries, directly or indirectly, said differential board (22) also free in pivoting on said pre first shoulder ring (51), said differential board (22) bearing on said balls (25), and said ratchet (21) being driven on said first shoulder ring (51) so as to frictionally drive said differential board (22). Motor (10) of timepieces according to claim 3, characterized in that said ratchet (21) is external to said barrel, which comprises a drum (14) provided with a toothing and a cover (12), and faces said cover (12), or respectively to said drum (14), and in that said differential (20) is arranged to be interposed axially between said cover (12), or respectively said drum (14), and said ratchet ( 21). Clockwork motor (10) according to claim 3 or 4, characterized in that said motor (10) comprises a plate (2) which carries a first differential drive gear (30) meshing with said ratchet (21) and with a second differential gear wheel (40) which also carries said plate (2) and which meshes with said differential board (22). A clockwork motor (10) comprising a barrel, pivoting about a shaft (11), enclosing a spring mounted between a drum (14) of said barrel and said shaft (11), which pivotally supports a ratchet (21) driving said shaft (11), said motor (10) having a differential (20) whose first input is driven indirectly by said ratchet (21) and a second input is said cylinder, and whose output is a wheel of pivoting outlet (23), coaxial with said shaft (11), arranged to drive a power-reserve indicator (51), and wherein said differential (20) comprises balls (25) driving housing of said outlet wheel (23) forming a basket, and cooperating with an upper surface (13) of said cylinder and with a lower surface (26), which is disposed on the side of said upper surface (13) of said cylinder, of a differential board (22), which board (22) is arranged to pivot on said shaft (11), coaxial with it, and is connected to said ratchet (21) or a plate (2) by a friction means (24) , and which constitutes said first input, characterized in that it comprises a plate (2) carrying said motor (10), and which comprises at least two pivots (60) each carrying a pinion (61) having a toothing (62) meshes, on the one hand with an external toothing that includes said differential board (22), and on the other hand with an internal toothing (210) that includes a said ratchet (21). Differential unit (50) arranged to be mounted on a clockwork shaft (11), characterized in that it constitutes a removable subassembly in a single block and comprises a first shoulder ring (51), arranged to be freely mounted axially on a bearing surface of a shaft (11) and integral in pivoting with a said shaft (11), which first shoulder ring (51) carries, coaxially, an output wheel (23) pivotably mounted relative to said first stepped ring (51), said output wheel (23) constituting a basket for a plurality of balls (25) projecting at a lower end of said differential subassembly (50) and arranged to roll on a surface of revolution of a mobile or a barrel, said first shoulder ring (51) carrying, directly or indirectly, a differential board (22) also free to pivot on said first shoulder ring (51) and mounted frictionally on said balls (25) of the c side opposite to their projecting end to said lower end, and a ratchet (21) being driven on said first ring shoulder (51) so as to be driven by said differential friction board (22). Clockwork movement (200) comprising at least one motor (10) according to one of claims 1 to 7. Watch (300) or timepiece, comprising at least one motor (10) according to one of claims 1 to 7.

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