EP2455820B1 - Driving organ for clockwork - Google Patents
Driving organ for clockwork Download PDFInfo
- Publication number
- EP2455820B1 EP2455820B1 EP11188982.0A EP11188982A EP2455820B1 EP 2455820 B1 EP2455820 B1 EP 2455820B1 EP 11188982 A EP11188982 A EP 11188982A EP 2455820 B1 EP2455820 B1 EP 2455820B1
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- EP
- European Patent Office
- Prior art keywords
- spring
- springs
- driving mechanism
- plate
- barrel
- 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.)
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- 239000002131 composite material Substances 0.000 description 17
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- 229910000831 Steel Inorganic materials 0.000 description 7
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- XMWRBQBLMFGWIX-UHFFFAOYSA-N C60 fullerene Chemical class C12=C3C(C4=C56)=C7C8=C5C5=C9C%10=C6C6=C4C1=C1C4=C6C6=C%10C%10=C9C9=C%11C5=C8C5=C8C7=C3C3=C7C2=C1C1=C2C4=C6C4=C%10C6=C9C9=C%11C5=C5C8=C3C3=C7C1=C1C2=C4C6=C2C9=C5C3=C12 XMWRBQBLMFGWIX-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- 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
- G04B1/00—Driving mechanisms
- G04B1/10—Driving mechanisms with mainspring
- G04B1/12—Driving mechanisms with mainspring with several mainsprings
-
- 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
- G04B1/00—Driving mechanisms
- G04B1/10—Driving mechanisms with mainspring
- G04B1/14—Mainsprings; Bridles therefor
- G04B1/145—Composition and manufacture of the springs
Definitions
- the present invention relates to a motor unit for a watch movement comprising several springs. More particularly, the present invention relates to a motor member having a power reserve superior to conventional drive members while having a long life and maximizing the return of stored energy.
- the spiral barrel spring is the organ for storing the mechanical energy necessary for the operation of the watch. Generally, its geometric dimensions and the mechanical properties of the material that compose it determine the potential energy that the spiral barrel is capable of storing and the maximum torque that it delivers.
- the conventional motor unit comprising a single spring barrel by a group of two barrels coupled in series, in order to accumulate a potential energy large enough to ensure a reserve of it is better than the usual 40 hours, without affecting the chronometric performance of the watch or the efficiency of the wheels.
- CH610465 which presents as examples a superimposed arrangement and a juxtaposed disposition of the barrels.
- the document US249845 discloses a motor member using a single drum barrel provided with two superposed springs, wound in opposite directions to wind or unwind in series.
- the springs are fixed at their inner end to the barrel shaft and at their outer end to the drum.
- the two springs are separated by a separation disc which rests on a shoulder of the shaft and holds it in position.
- the separating disc described in the two documents above is however subject to wear, even in the case where the disc is made of antifriction material. This wear can be rapid, particularly in the case of friction of the metal springs against the disc, and can generate wear debris may spread in a clockwork using the motor.
- the separation disk can also be a source of dissipation of stored energy due to friction between the superposed springs and the disk.
- An object of the present invention is to provide a motor member free from the limitations of the known prior art.
- Another object of the invention is to provide a motor member having a higher power reserve to conventional drive members while having a low height and minimizing the friction of the springs and therefore wear.
- a motor member comprising a barrel mounted on a shaft so as to be rotatable about an axis of the shaft when the drive member is raised; a motor spring unit comprising first and second springs wound inside the barrel superimposed and coaxial with each other, the first and second springs being coupled at one end to the barrel and to the tree, respectively; the unit further comprising a plate mounted coaxially between the two springs; characterized in that the plate is rotatably mounted on the axis; and in that the first and second springs are coupled at their other end to the center and the periphery of the plate, respectively, so that the two springs arm simultaneously around the axis when the motor member is raised.
- the motor member comprises a plurality of motor spring units connected in series.
- the first and second springs are made of fiber reinforced polymer.
- the motor member of the invention can be advantageously used in a timepiece.
- This solution has the advantage over the prior art of obtaining a low-rise motor member, having a longer life and maximizing the return of stored energy.
- a motor unit 1 is shown in section at the figure 1 according to one embodiment.
- the drive member 1 comprises a cylinder 2 formed of a cylindrical outer drum 6 and a bottom 7, and may have an external toothing (not shown).
- the barrel 2 is mounted on a shaft 3 so as to freely rotate on an axis 4 of the shaft 3.
- a first motor spring 8 and a second motor spring 11 are mounted wound inside the barrel 2 in a superimposed manner and coaxial.
- the two springs 8, 11 typically have the same dimensions and characteristics and are wound in opposite directions.
- the barrel 2 also comprises a plate 14 disposed between the two springs 8, 11 and coaxial with them and the axis 4 of the shaft 3.
- the plate is mounted in the barrel 2 so as to be able to freely rotate around the barrel 2. 4.
- the assembly comprising the two springs 8, 11 and the plate 14 will also be designated by the expression "motor spring unit" in the rest of the text.
- the inner end 10 of the first spring 8 is coupled to the center 16 of the plate 14, while its outer end 9 is fixed to the outer drum 6 of the barrel 2.
- the expression “in the center” means a region of the plate near its center, near the axis 4.
- the outer end 13 of the second spring 11 is coupled to the periphery 15 of the plate 14, while its inner end 12 is coupled to the shaft 3.
- the springs 8, 11 are thus mounted in series through the plate 14, the latter serving as kinematic connection between the two springs 8, 11.
- the plate 14 has the shape of a disc with an outer diameter substantially equal to that of the outer drum 6.
- the plate 14 also comprises a gun 17 pivoting on the shaft 3.
- the barrel 16 serves as a plug on which is fixed the inner end 10 of the first spring 8.
- the periphery of the plate 14 may also include a flange 15 on which comes attaching the outer end 13 of the second spring 11.
- the inner end 12 of the second spring 11 can also be fixed to the shaft 3 via a plug (not shown).
- the plate 14 may be made of a plastic material with a low coefficient of friction such as PTFE, but also of metal, optionally with an anti-friction coating.
- a winding mechanism (not shown) can come into engagement with the external toothing of the barrel 2 so as to rotate the barrel around the shaft 3 and arm the springs 8, 11 More particularly, during reassembly, the rotation of the barrel 2 arms the first spring 8 about the axis 4.
- the inner end 10 of the first spring 8 is fixed to the center of the plate 14, the latter is to be driven in. rotation during the arming of the first spring 8.
- the plate 14 then transmits its torque to the second spring 11 which is thus simultaneously armed with the first spring 8 about the axis 4.
- the first and second springs 8, 11 being connected in series in the barrel 2, the active length of the motor spring unit is effectively doubled for a given diameter compared to a conventional arrangement where the barrel comprises a single spring wound around the barrel. 3.
- the motor member 1 comprises a plurality of motor spring units connected in series.
- the motor spring units can be arranged superimposed and coaxial with each other; the two springs 8, 11 and the plate 14 of each of the motor spring units being arranged as described above.
- a motor spring unit may have more than two springs, for example three springs with a third spring mounted on a second plate, the two plates being able to turn freely about the axis 4.
- the inner end of the second spring is coupled to the barrel of the second plate
- the outer end of the third spring is coupled to the periphery of the second plate
- the inner end of the third spring is coupled directly to the shaft of the barrel.
- the height of the motor unit 1 of the invention is determined by the height of each of the springs and that of the tray (s) (x).
- the motor member 1 can thus be made with a height typically lower than the height of the conventional drive members which would include the same number of motor springs, particularly in the case of the drive members where each spring is included in its own barrel.
- the plate 14 rotates with the first and second springs 8, 11, the friction between the springs 8, 11 and the plate 14 are greatly reduced compared to the conventional drive members which comprise a fixed separation disk.
- the motor unit 1 of the invention thus makes it possible to maximize the return of the energy stored in the drive member.
- first and second springs 8, 11 are made of a composite material.
- composite material is meant herein a polymer reinforced with long fibers, such as glass fibers or the like.
- the fibers are oriented unidirectionally in the polymeric matrix.
- Such springs made of the composite material may be less susceptible than conventional metal springs to fatigue fractures and, therefore, have a longer life.
- the fibers of such a composite spring may be carbon, glass, aramid or of another nature (for example fiber mixtures) but in all cases their axial elastic modulus is preferably between 80GPa and 600GPa.
- the fibers are generally the same length as the spring and are arranged as parallel as possible to the great length of the spring. Preferably, the angle between the axis of each fiber and the axis of the spring is as close as possible to 0 ° and does not exceed locally 5 °.
- the fibers typically have a diameter of between 1 ⁇ m and 35 ⁇ m.
- a single spring may have fibers of different diameters but preferably the diameters used in the thickness of the spring allow to place at least ten fibers side by side to obtain a spring of better homogeneity.
- the polymer may be a thermoplastic or a thermosetting plastic.
- the volume fraction of fibers in this polymer is preferably between 30% and 75%.
- Nanoparticles may be added to the polymer matrix so as to harden the latter to repel the micro-buckling of the fibers in the compressive face of the spring in flexion. These nanoparticles may be silica, fullerenes, or any other material having the ability to bind to the polymeric resin and increase its compressive strength, without decreasing the ability of the polymeric resin to bind to the fibers.
- Such fiber reinforced polymer springs can be manufactured, for example, according to a process described in the document US4464216 that is to say, by filament winding around a mandrel of continuous fibers (graphite, glass, etc.) pre-impregnated with a thermosetting or thermoplastic matrix.
- the accumulation of elastic energy in the hairspring is obtained by winding one end of the spring around the axis 4 of the shaft 3, in a direction opposite to the direction of initial winding on the mandrel.
- the profile of the disarmed spring is entirely determined by the outer diameter of the mandrel.
- the use of said composite materials for the manufacture of the springs 8, 11 may require the sizing of the springs taking into account the specificities that differentiate these composite materials traditionally used steels.
- a unidirectional fiberglass-reinforced polymer has a modulus of elasticity about four times lower than that of steel for a lower yield strength of about half.
- the dimensioning of the springs must also take into account the modes of implementation of the composite materials. Indeed, if steel rolling techniques allow blade thicknesses less than one-tenth of a millimeter, such reduced dimensions are difficult with the mechanical performance targeted in the case of composite materials. At constant volume and spring height, and for an equivalent amount of stored energy, a larger blade thickness results in an increase in the maximum torque delivered.
- This composite material is for example a material comprising an epoxy matrix reinforced with 60% HiPer-tex TM glass fiber Young module of about 90 GPa, which gives a Young module of about 53 GPa for the composite material.
- a spring of composite material can store a quantity of energy equivalent to that of a conventional steel spring when armed, but the steel spring, typically more thin, restores the energy stored at low torque and on a large number of revolutions, while the spring of composite material delivers it with a larger torque and a reduced number of revolutions.
- a stiffness and especially too much thickness of the composite material springs are responsible for this situation.
- the driving member 1 according to the configuration of the figure 1 allows to mount the two springs 8, 11 in series and thus reduce their stiffness while maintaining thicknesses adapted to said composite materials.
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- Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Springs (AREA)
- Electromechanical Clocks (AREA)
Description
La présente invention concerne un organe moteur pour mouvement d'horlogerie comportant plusieurs ressorts. Plus particulièrement, la présente invention concerne un organe moteur ayant une réserve de marche supérieure aux organes moteurs conventionnels tout en ayant une longue durée de vie et en maximisant la restitution de l'énergie emmagasinée.The present invention relates to a motor unit for a watch movement comprising several springs. More particularly, the present invention relates to a motor member having a power reserve superior to conventional drive members while having a long life and maximizing the return of stored energy.
Le ressort de barillet spiral est l'organe permettant d'emmagasiner l'énergie mécanique nécessaire au fonctionnement de la montre. Généralement, ses dimensions géométriques et les propriétés mécaniques du matériau qui le compose déterminent l'énergie potentielle que le barillet spiral est capable d'emmagasiner et le couple maximal qu'il délivre. Dans le domaine des mouvements de montres mécaniques, il est bien connu de remplacer l'organe moteur usuel comprenant un seul barillet à ressort par un groupe de deux barillets couplés en série, afin d'accumuler une énergie potentielle assez grande pour assurer une réserve de marche supérieure aux quelques 40 heures habituelles, sans affecter les performances chronométriques de la montre ni le rendement des rouages. On trouvera une explication détaillée des caractéristiques fonctionnelles d'un tel organe moteur dans le brevet
Dans la demande de brevet
Le document
Le disque de séparation décrit dans les deux documents ci-dessus est cependant sujet à usure, même dans le cas où le disque est en matériau antifriction. Cette usure peut être rapide, particulièrement dans le cas de frottement des ressorts métalliques contre le disque, et peut générer des débris d'usure susceptible de se répandre dans un mécanisme d'horlogerie utilisant l'organe moteur. De plus, le disque de séparation peut également être une source de dissipation de l'énergie emmagasinée due aux frottements entre les ressorts superposés et le disque.The separating disc described in the two documents above is however subject to wear, even in the case where the disc is made of antifriction material. This wear can be rapid, particularly in the case of friction of the metal springs against the disc, and can generate wear debris may spread in a clockwork using the motor. In addition, the separation disk can also be a source of dissipation of stored energy due to friction between the superposed springs and the disk.
Un but de la présente invention est de proposer un organe moteur exempt des limitations de l'art antérieur connu.An object of the present invention is to provide a motor member free from the limitations of the known prior art.
Un autre but de l'invention est de proposer un organe moteur ayant une réserve de marche supérieure aux organes moteurs conventionnels tout en ayant une faible hauteur et en minimisant les frottements des ressorts et donc l'usure.Another object of the invention is to provide a motor member having a higher power reserve to conventional drive members while having a low height and minimizing the friction of the springs and therefore wear.
Selon l'invention, ces buts sont atteints notamment au moyen d'un organe moteur comportant un barillet monté sur un arbre de sorte à pouvoir tourner autour d'un axe de l'arbre lorsque l'organe moteur est remonté; une unité ressort moteur comprenant un premier et deuxième ressorts enroulés à l'intérieur du barillet de façon superposée et coaxiale l'un par rapport à l'autre, le premier et le deuxième ressorts étant couplés à l'une de leur extrémité au barillet et à l'arbre, respectivement; l'unité comprenant en outre un plateau monté coaxial entre les deux ressorts; caractérisé en ce que le plateau est monté en rotation sur l'axe; et en ce que le premier et le deuxième ressorts sont couplés à leur autre extrémité au centre et à la périphérie du plateau, respectivement, de sorte que les deux ressorts s'arment simultanément autour de l'axe lorsque l'organe moteur est remonté.According to the invention, these objects are achieved in particular by means of a motor member comprising a barrel mounted on a shaft so as to be rotatable about an axis of the shaft when the drive member is raised; a motor spring unit comprising first and second springs wound inside the barrel superimposed and coaxial with each other, the first and second springs being coupled at one end to the barrel and to the tree, respectively; the unit further comprising a plate mounted coaxially between the two springs; characterized in that the plate is rotatably mounted on the axis; and in that the first and second springs are coupled at their other end to the center and the periphery of the plate, respectively, so that the two springs arm simultaneously around the axis when the motor member is raised.
Dans un mode de réalisation, l'organe moteur comprend plusieurs unités ressort moteur montées en série.In one embodiment, the motor member comprises a plurality of motor spring units connected in series.
Dans un autre mode de réalisation, les premier et deuxième ressorts sont fabriqués en polymère renforcé de fibres.In another embodiment, the first and second springs are made of fiber reinforced polymer.
L'organe moteur de l'invention peut être avantageusement utilisé dans une pièce d'horlogerie.The motor member of the invention can be advantageously used in a timepiece.
Cette solution présente notamment l'avantage par rapport à l'art antérieur d'obtenir un organe moteur de faible hauteur, ayant une durée de vie plus longue et maximisant la restitution de l'énergie emmagasinée.This solution has the advantage over the prior art of obtaining a low-rise motor member, having a longer life and maximizing the return of stored energy.
Des exemples de mise en oeuvre de l'invention sont indiqués dans la description illustrée par les figures annexées dans lesquelles :
- La
figure 1 illustre un organe moteur selon un mode de réalisation; et - La
figure 2 montre un graphique comparant la relation entre le couple théoriquement délivré en fonction du nombre de tours pour un ressort fait en acier conventionnel et un ressort en matériau composite.
- The
figure 1 illustrates a motor member according to one embodiment; and - The
figure 2 shows a graph comparing the relationship between the theoretically delivered torque versus the number of turns for a spring made of conventional steel and a spring of composite material.
Un organe moteur 1 est montré en coupe à la
De façon préférée, l'extrémité intérieure 10 du premier ressort 8 est couplée au centre 16 du plateau 14, tandis que son extrémité extérieure 9 est fixée au tambour extérieur 6 du barillet 2. Ici, l'expression "au centre" signifie une région du plateau à proximité de son centre, près de l'axe 4. L'extrémité extérieure 13 du deuxième ressort 11 est couplée à la périphérie 15 du plateau 14, tandis que son extrémité intérieure 12 est couplée à l'arbre 3. Les ressorts 8, 11 se trouvent ainsi montés en série par l'intermédiaire du plateau 14, ce dernier servant de liaison cinématique entre les deux ressorts 8, 11.Preferably, the
Dans le mode de réalisation montré à la
Lors du fonctionnement de l'organe moteur 1, un mécanisme de remontage (non représenté) peut venir s'engrener sur la denture extérieure du barillet 2 de sorte à faire tourner ce dernier autour de l'arbre 3 et armer les ressorts 8, 11. Plus particulièrement, lors du remontage, la rotation du barillet 2 arme le premier ressort 8 autour de l'axe 4. L'extrémité intérieure 10 du premier ressort 8 étant fixée au centre du plateau 14, ce dernier se trouve à être entraîné en rotation pendant l'armage du premier ressort 8. Le plateau 14 transmet alors son couple au deuxième ressort 11 qui s'arme donc simultanément avec le premier ressort 8 autour de l'axe 4.During operation of the
Les premier et deuxième ressorts 8, 11 étant montés en série dans le barillet 2, la longueur active de l'unité ressort moteur est effectivement doublée pour un diamètre donné par rapport à un arrangement conventionnel où le barillet comprend un seul ressort enroulé autour de l'arbre 3. La configuration de l'organe moteur 1 permet ainsi de diviser la hauteur et le couple de chacun des ressorts 8, 11, par exemple par un facteur deux, tout en emmagasinant la même quantité d'énergie élastique par rapport à des ressorts conventionnels ayant une hauteur deux fois supérieure. Il est cependant également possible d'augmenter la quantité d'énergie et la réserve de marche de l'unité ressort moteur, pour un même volume total de l'organe moteur 1 (c'est-à-dire en ne changeant pas la hauteur des ressorts 8, 11).The first and
Dans un autre mode de réalisation non représenté, l'organe moteur 1 comprend plusieurs unités ressort moteur montées en série. Dans cette configuration, les unités ressort moteur peuvent être arrangées de manière superposée et coaxiale les unes avec les autres; les deux ressorts 8, 11 et le plateau 14 de chacune des unités ressort moteur étant arrangés comme décrit ci-dessus.In another embodiment not shown, the
Selon une autre mode de réalisation non représenté, une unité ressort moteur peut avoir plus de deux ressorts, par exemple trois ressorts avec un troisième ressort monté sur un second plateau les deux plateaux pouvant se tourner librement autour de l'axe 4. Dans ce cas, l'extrémité intérieure du deuxième ressort est couplée au canon du second plateau, l'extrémité extérieure du troisième ressort est couplée à la périphérie du second plateau, et l'extrémité intérieure du troisième ressort est couplée directement à l'arbre du barillet.According to another embodiment not shown, a motor spring unit may have more than two springs, for example three springs with a third spring mounted on a second plate, the two plates being able to turn freely about the
La hauteur de l'organe moteur 1 de l'invention, comprenant la ou les unités ressort moteur dans un même barillet 2, est déterminée par la hauteur de chacun des ressorts et celle du ou des plateau(x). L'organe moteur 1 peut donc ainsi être réalisé avec une hauteur typiquement plus faible que la hauteur des organes moteurs conventionnels qui comprendraient le même nombre de ressorts moteurs, en particulier dans le cas des organes moteurs où chaque ressort est compris dans son propre barillet. De plus, comme le plateau 14 tourne avec les premier et deuxième ressorts 8, 11, les frottements entre les ressorts 8, 11 et le plateau 14 sont fortement diminués par rapport aux organes moteurs conventionnels qui comprennent un disque de séparation fixe. L'organe moteur 1 de l'invention permet donc de maximiser la restitution de l'énergie emmagasinée dans l'organe moteur.The height of the
Dans un autre mode de réalisation, les premier et deuxième ressorts 8, 11 sont fabriqués dans un matériau composite. Par "matériau composite" on entend ici un polymère renforcé de fibres longues, telles que des fibres de verre ou autres. Préférablement, les fibres sont orientées de façon unidirectionnelle dans la matrice polymérique. De tels ressorts fabriqués dans le matériau composite peuvent être moins susceptibles que les ressorts conventionnels métalliques aux fractures par fatigue et, par conséquent, avoir une durée de vie plus longue.In another embodiment, the first and
Les fibres d'un tel ressort composite pourront être en carbone, en verre, en aramide ou encore d'une autre nature (par exemple des mélanges de fibres) mais dans tous les cas leur module d'élasticité axiale est de préférence compris entre 80GPa et 600GPa. Les fibres ont généralement la même longueur que le ressort et sont disposées de façon aussi parallèle que possible à la grande longueur du ressort. De préférence, l'angle entre l'axe de chaque fibre et l'axe du ressort est le plus proche possible à 0° et ne dépasse pas localement 5°. Les fibres ont typiquement un diamètre compris entre 1µm et 35µm. Un seul ressort peut avoir des fibres de diamètres différents mais de préférence les diamètres utilisées dans l'épaisseur du ressort permettent de placer au moins dix fibres côte à côte afin d'obtenir un ressort d'une meilleure homogénéité.The fibers of such a composite spring may be carbon, glass, aramid or of another nature (for example fiber mixtures) but in all cases their axial elastic modulus is preferably between 80GPa and 600GPa. The fibers are generally the same length as the spring and are arranged as parallel as possible to the great length of the spring. Preferably, the angle between the axis of each fiber and the axis of the spring is as close as possible to 0 ° and does not exceed locally 5 °. The fibers typically have a diameter of between 1 μm and 35 μm. A single spring may have fibers of different diameters but preferably the diameters used in the thickness of the spring allow to place at least ten fibers side by side to obtain a spring of better homogeneity.
Le polymère peut être un thermoplastique ou un plastique thermodurcissable. La fraction volumique de fibres dans ce polymère est de préférence comprise entre 30% et 75%. Des nanoparticules peuvent être ajoutées dans la matrice de polymère de façon à durcir cette dernière pour repousser le micro-flambage des fibres dans la face en compression du ressort en flexion. Ces nanoparticules pourront être de la silice, des fullerènes, ou tout autre matériau ayant la possibilité de se lier à la résine polymérique et d'en augmenter la résistance à la compression, sans diminuer la capacité de la résine polymérique à se lier aux fibres.The polymer may be a thermoplastic or a thermosetting plastic. The volume fraction of fibers in this polymer is preferably between 30% and 75%. Nanoparticles may be added to the polymer matrix so as to harden the latter to repel the micro-buckling of the fibers in the compressive face of the spring in flexion. These nanoparticles may be silica, fullerenes, or any other material having the ability to bind to the polymeric resin and increase its compressive strength, without decreasing the ability of the polymeric resin to bind to the fibers.
De tels ressorts en polymère renforcé de fibres peuvent être fabriqués, par exemple, selon un procédé décrit dans le document
Le recours auxdits matériaux composites pour la fabrication des ressorts 8, 11 peut nécessiter le dimensionnement des ressorts en tenant compte des spécificités qui différencient ces matériaux composites des aciers traditionnellement utilisés. Par exemple, un polymère renforcé de fibres de verre unidirectionnelles présente un module d'élasticité environ quatre fois inférieur à celui de l'acier pour une limite élastique inférieure d'environ la moitié. Le dimensionnement des ressorts doit également tenir compte des modes de mise en oeuvre des matériaux composites. En effet, si les techniques de laminage de l'acier autorisent des épaisseurs de lame inférieures au dixième de millimètre, des dimensions aussi réduites sont difficiles avec les performances mécaniques visées dans le cas des matériaux composites. A volume et hauteur de ressort constants, et pour une quantité d'énergie emmagasinée équivalente, une épaisseur de la lame plus importante se traduit par une augmentation du couple maximal délivré. Ceci est illustré par le graphique de la
Dans le cas d'un organe moteur ne comprenant qu'un seul ressort, un ressort en matériau composite peut emmagasiner une quantité d'énergie équivalente à celle d'un ressort en acier conventionnel lorsqu'armé, mais le ressort en acier, typiquement plus mince, restitue l'énergie emmagasinée à faible couple et sur un grand nombre de tours, tandis que le ressort en matériau composite la délivre avec un couple plus important et un nombre de tours réduit. Une raideur et surtout une épaisseur trop importantes des ressorts en matériau composite sont responsables de cette situation. Avantageusement, l'organe moteur 1 selon la configuration de la
- 11
- organe moteurmotor organ
- 22
- barilletbarrel
- 33
- arbretree
- 44
- axe de l'arbreaxis of the tree
- 66
- tambour extérieuroutside drum
- 77
- fond du barilletbottom of the barrel
- 88
- premier ressort moteurfirst spring motor
- 99
- extrémité extérieure du premier ressortouter end of the first spring
- 1010
- extrémité intérieure du premier ressortinner end of the first spring
- 1111
- deuxième ressort moteursecond motor spring
- 1212
- extrémité intérieure du deuxième ressortinner end of the second spring
- 1313
- extrémité extérieure du deuxième ressortouter end of the second spring
- 1414
- plateautray
- 1515
- périphérie du plateau, rebordperiphery of the plateau, ledge
- 1616
- centre du plateaucenter of the plateau
- 1717
- canon du plateaucannon of the board
Claims (8)
- Driving mechanism (1) for watch movement, having
a barrel (2) mounted on an arbor (3) so as to be capable of turning around an axis (4) of the arbor (3) when the driving mechanism (1) is wound up;
a mainspring unit having a first spring (8) and second spring (11) arranged to be coiled up inside the barrel (2) in superimposed fashion and coaxial one relative to the other, wherein the first spring (8) is arranged to be coupled at one of its extremities to the barrel (2) and the second spring (11) is arranged to be coupled at one of its extremities to the arbor (3); wherein the unit further comprises a plate (14) mounted coaxially between the two springs (8, 11); wherein the plate (14) is arranged to be mounted rotatively around the axis (4); characterized in that, in said mainspring,
the first spring (8) is coupled at the other of its extremities to the centre (16) of the plate (14) and the second spring (11) is coupled at the other of its extremities to the periphery (15) of the plate (14), so that the two springs (8, 11) simultaneously wind up around the axis (4) when the driving mechanism (1) is wound up. - The driving mechanism (1) according to claim 1, wherein the first spring (8) is wound in the opposite direction to the second spring (11).
- The driving mechanism (1) according to claims 1 or 2, wherein the plate (14) comprises a hub (16) engaging in pivoting fashion onto the arbor (3), wherein the inner extremity (10) of the first spring (8) is fastened onto the hub (16).
- The driving mechanism (1) according to one of the claims 1 to 3, wherein the periphery of the plate has an edge (15) onto which the outer extremity (13) of the second spring (11) is fastened.
- The driving mechanism (1) according to one of the claims 1 to 4, having several mainspring units mounted serially.
- The driving mechanism (1) according to one of the claims 1 to 5, wherein the first and second springs (8, 11) are made of fibre-reinforced polymer.
- The driving mechanism (1) according to claim 6, wherein the fibres are oriented unidirectionally in the polymer matrix.
- Timepiece comprising the driving mechanism (1) characterized by one of the claims 1 to 7.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH01923/10A CH704150A2 (en) | 2010-11-17 | 2010-11-17 | Body engine for clockwork. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2455820A2 EP2455820A2 (en) | 2012-05-23 |
EP2455820A3 EP2455820A3 (en) | 2016-05-18 |
EP2455820B1 true EP2455820B1 (en) | 2017-08-30 |
Family
ID=44993504
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11188982.0A Active EP2455820B1 (en) | 2010-11-17 | 2011-11-14 | Driving organ for clockwork |
Country Status (5)
Country | Link |
---|---|
US (1) | US20120120775A1 (en) |
EP (1) | EP2455820B1 (en) |
JP (1) | JP2012108133A (en) |
CN (1) | CN102467069A (en) |
CH (1) | CH704150A2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH706641A2 (en) * | 2012-06-22 | 2013-12-31 | Cartier Creation Studio Sa | Body engine for clockwork. |
EP2701013B1 (en) | 2012-08-23 | 2019-06-12 | Audemars Piguet (Renaud et Papi) SA | Clock movement with extended power reserve |
DE102016122936B4 (en) * | 2016-11-28 | 2018-11-08 | Lange Uhren Gmbh | Barrel for a watch |
WO2018146639A1 (en) * | 2017-02-13 | 2018-08-16 | Patek Philippe Sa Geneve | Timepiece drive member |
EP3382468B1 (en) | 2017-03-30 | 2020-01-15 | The Swatch Group Research and Development Ltd | Movement with extension of running reserve |
JP6626594B1 (en) * | 2018-07-02 | 2019-12-25 | セイコーインスツル株式会社 | Spiral spring, torque generator, watch movement and watch |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US249845A (en) | 1881-11-22 | Strike-spring for eight-day clocks | ||
US410327A (en) * | 1889-09-03 | meylan | ||
CH610465B5 (en) | 1972-11-02 | 1979-04-30 | Longines Montres Comp D | Watch movement containing two barrels |
CH599580B5 (en) * | 1974-08-22 | 1978-05-31 | Longines Montres Comp D | |
US4464216A (en) | 1982-03-26 | 1984-08-07 | Hercules Incorporated | Composite negator springs |
DE602004016282D1 (en) * | 2004-04-01 | 2008-10-16 | Richemont Int Sa | Movement with several barrels |
EP2060957A1 (en) | 2007-11-16 | 2009-05-20 | ETA SA Manufacture Horlogère Suisse | Motor element with springs for timepiece movement |
CH699988A2 (en) * | 2008-11-28 | 2010-05-31 | Patek Philippe Sa Geneve | Driving member for watch movement. |
-
2010
- 2010-11-17 CH CH01923/10A patent/CH704150A2/en not_active Application Discontinuation
-
2011
- 2011-11-08 US US13/291,540 patent/US20120120775A1/en not_active Abandoned
- 2011-11-14 EP EP11188982.0A patent/EP2455820B1/en active Active
- 2011-11-16 JP JP2011250799A patent/JP2012108133A/en active Pending
- 2011-11-16 CN CN2011104306065A patent/CN102467069A/en active Pending
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
EP2455820A3 (en) | 2016-05-18 |
EP2455820A2 (en) | 2012-05-23 |
JP2012108133A (en) | 2012-06-07 |
CH704150A2 (en) | 2012-05-31 |
US20120120775A1 (en) | 2012-05-17 |
CN102467069A (en) | 2012-05-23 |
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