EP3023844A1 - Flexible ferrule - Google Patents

Flexible ferrule Download PDF

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Publication number
EP3023844A1
EP3023844A1 EP14194118.7A EP14194118A EP3023844A1 EP 3023844 A1 EP3023844 A1 EP 3023844A1 EP 14194118 A EP14194118 A EP 14194118A EP 3023844 A1 EP3023844 A1 EP 3023844A1
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EP
European Patent Office
Prior art keywords
ferrule
passage
spiral spring
balance shaft
contact lines
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.)
Granted
Application number
EP14194118.7A
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German (de)
French (fr)
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EP3023844B1 (en
Inventor
Marc Stranczl
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.)
Nivarox Far SA
Nivarox SA
Original Assignee
Nivarox Far SA
Nivarox SA
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Publication date
Application filed by Nivarox Far SA, Nivarox SA filed Critical Nivarox Far SA
Priority to EP14194118.7A priority Critical patent/EP3023844B1/en
Priority to JP2015222829A priority patent/JP6275102B2/en
Priority to TW104137894A priority patent/TWI685728B/en
Priority to US14/944,790 priority patent/US9658599B2/en
Priority to CN201510795202.4A priority patent/CN105629697B/en
Priority to KR1020150162775A priority patent/KR101787838B1/en
Publication of EP3023844A1 publication Critical patent/EP3023844A1/en
Priority to HK16110593.2A priority patent/HK1222461A1/en
Application granted granted Critical
Publication of EP3023844B1 publication Critical patent/EP3023844B1/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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • G04B17/34—Component parts or constructional details, e.g. collet, stud, virole or piton for fastening the hairspring onto the balance
    • 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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • 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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • G04B17/34—Component parts or constructional details, e.g. collet, stud, virole or piton for fastening the hairspring onto the balance
    • G04B17/345—Details of the spiral roll

Definitions

  • the invention relates to an elastic shell intended to be fixed on an axis.
  • the invention also relates to a one-piece spiral spring / elastic ferrule assembly, and a method of manufacturing such a one-piece assembly.
  • the introduction of the balance spring on the axis of the balance is done by means of a ferrule, which is in the form of a ring intended to be driven on the axis of balance and pierced laterally to receive the inner end of the spiral spring.
  • the balance shaft can also be welded to the ferrule.
  • Silicon is a material with many advantages for the manufacture of spiral springs, and micro-manufacturing techniques make it possible to produce a one-piece spiral spring / ferrule assembly.
  • the main disadvantage of silicon is that it does not have a plastic deformation domain. The ferrule can therefore break easily if the stresses exceed the elastic limit. It is thus necessary to dimension the shell both to maintain the spiral spring on the axis of the balance during the operation of the oscillator (minimum torque) and also to be able to assemble the shell with axes, without breaking (or undergoing plastic deformation) if the diameter of the balance shaft and the geometric variations of the ferrule remain within a given tolerance range.
  • the documents EP 1,513,029 and EP 2,003,523 propose ferrules having a triangular opening.
  • the attachment of the spiral takes place at a point of attachment located at one of the vertices of the triangles.
  • the ferrule is formed of an external stiffening structure to which are attached flexible arms which deform to accommodate the balance shaft.
  • Document is also known WO2011026725 a spiral-ferrule spring assembly, with a ferrule having a bore provided with four circular bearing parts for receiving the balance shaft.
  • the bearing portions are delimited by longitudinal grooves formed in the bore of the ferrule.
  • the invention relates to a timepiece comprising a junction point with a spiral spring and a passage for receiving a balance shaft.
  • the passage is substantially cylindrical and is configured to deform elastically in a plane perpendicular to the axis of the passage and resiliently tighten the balance shaft by at least 2 contact lines extending over the height of the internal wall of the passage when the balance shaft is introduced into the passage.
  • An advantage of the invention is that the entire ferrule is deformed, unlike ferrules of the prior art, the ferrule does not have a nose or other rigid part. In the case of the invention, almost all of the ferrule is deformed, except the point of attachment of the ferrule.
  • the invention also relates to a one-piece ferrule / spiral spring assembly comprising a ferrule according to the invention.
  • the invention also relates to a watch movement or a timepiece comprising a one-piece ferrule-spiral spring assembly according to the invention.
  • the invention relates to a ferrule whose material does not comprise a usable plastic field, that is to say with a very small plastic field.
  • the ferrule-spiral assembly illustrated on the figure 2 is made in one piece, typically silicon. It comprises a ferrule 1 and a spiral spring 2 attached at its inner turn 20 to a point of attachment S1 on the periphery of the ferrule 1.
  • the ferrule-spiral assembly is held on a balance shaft 4 with circular section by driving the shell 1 on this shaft 4.
  • the shell 1 comprises a substantially cylindrical passage 10, configured to deform elastically in a plane P perpendicular to the axis of the passage 10 and thus receive and resiliently tighten the balance shaft 4.
  • the flexible passage 10 is of oval shape, and more preferably of "oval triangular" shape, and comprises at least two lines of contact with the balance shaft 4.
  • the flexible passage 10 is of triangular oval shape, and has three contact lines 11a, 11b and 11c with the balance shaft 4, the three contact lines forming, for example, an equilateral triangle.
  • the three contact lines 11a, 11b, 11c with the balance shaft 4 form angles ⁇ , ⁇ and ⁇ between them.
  • the contact lines 11a, 11b and 11c define recesses 10a, 10b and 10c between the ferrule 1 and the rocker shaft 4, these recesses 10a, 10b and 10c being non-contact zones.
  • one of the contact lines is diametrically opposed to the point of attachment with the spiral spring 2, in this way the shell 1 does not undergo deformation at the point of attachment and the location of the point of attachment of the spring spiral 2 is not modified during the introduction of the ferrule 1.
  • the three contact lines 11a, 11b and 11c form between them an angle ⁇ , ⁇ , ⁇ which is preferably greater than 90 degrees, more preferably less than 150 degrees, and is here substantially equal to 120 degrees.
  • the passage 10 exerts, at the level of the contact lines 11a, 11b, 11c, elastic return forces reminding the inner wall of the passage in contact against the balance shaft.
  • the distance between the rocker shaft 4 and the shell 1 at the recesses 10a, 10 and 10c is greater than 0. There is therefore clamping at the three contact lines 11a, 11b and 11c but no clamping at the recesses 10a, 10b and 10c.
  • the distance between the rocker shaft 4 and the shell 1 at the recesses 10a, 10 and 10c is between 0 and a quarter of the diameter of the balance shaft 4. Even more preferably, the distance between the the balance shaft 4 and the ferrule 1 at the recesses 10a, 10 and 10c is between 0 and 50 ⁇ m.
  • the distance between the balance shaft 4 and the ferrule 1 ensures a small clearance while a clamping is applied at the level of the contact lines 11a, 11b and 11c.
  • Such an arrangement has the particular advantage of maximizing the support radius of the passage 10 of the collar 1 on the axis of the shaft 4, while ensuring a sufficient holding torque on the balance shaft 4, with a level of less than the maximum permissible stress for the material.
  • a greater support radius makes it possible to obtain a higher holding torque.
  • the thickness is determined so that the maximum stress exerted by the balance shaft 4 on the passage 10 is less than the elastic limit of the material forming the ferrule 1, that the ferrule 1 accommodates manufacturing tolerances of the balance shaft 4 and that the holding of the ferrule 1 on the shaft 4 (torque, driving force) is adequate.
  • the hairspring 2 comprises a blade 3 wound on itself in a plurality of turns, the inner turn 20 having come into shape with the shell 1.
  • the point of attachment S1 between the inner coil 20 and the ferrule 1 is located on the shell 1. It is also noted that the ferrule 1 is symmetrical with respect to the axis A passing through the center C of the ferrule 1 and the attachment point S 1 .
  • the shell 1 and the spiral spring 2 are made of silicon.
  • the ferrule 1 and the spiral spring 2 are made of a material having no plastic deformation, such as monocrystalline silicon, polycrystalline silicon, porous silicon, amorphous silicon, doped monocrystalline silicon, doped polycrystalline silicon, doped or non-doped silicon carbide, doped or non-doped silicon nitride, doped or non-doped silicon oxide such as quartz or silica, or ceramics.
  • a material having no plastic deformation such as monocrystalline silicon, polycrystalline silicon, porous silicon, amorphous silicon, doped monocrystalline silicon, doped polycrystalline silicon, doped or non-doped silicon carbide, doped or non-doped silicon nitride, doped or non-doped silicon oxide such as quartz or silica, or ceramics.
  • the ferrule 1 and the spiral spring 2 may also be made of a material such as amorphous metal.

Abstract

Virole d'horlogerie comprenant un point de jonction avec un ressort spiral et un passage destiné à recevoir un arbre de balancier. Selon l'invention, le passage est sensiblement cylindrique et est configuré pour se déformer élastiquement dans un plan perpendiculaire à l'axe du passage et serrer élastiquement l'arbre de balancier par au moins deux lignes de contact s'étendant sur la hauteur de la paroi interne du passage lorsque l'arbre de balancier est introduit dans le passage.Watch ring comprising a junction point with a spiral spring and a passage for receiving a balance shaft. According to the invention, the passage is substantially cylindrical and is configured to deform elastically in a plane perpendicular to the axis of the passage and resiliently tighten the balance shaft by at least two contact lines extending over the height of the internal wall of the passage when the balance shaft is introduced into the passage.

Description

Domaine de l'inventionField of the invention

L'invention se rapporte à une virole élastique destinée à être fixée sur un axe. L'invention concerne aussi un ensemble monobloc ressort spiral/virole élastique, ainsi qu'un procédé de fabrication d'un tel ensemble monobloc.The invention relates to an elastic shell intended to be fixed on an axis. The invention also relates to a one-piece spiral spring / elastic ferrule assembly, and a method of manufacturing such a one-piece assembly.

Arrière-plan de l'inventionBackground of the invention

Généralement, la mise en place du spiral sur l'axe du balancier se fait par le biais d'une virole, qui se présente sous la forme d'un anneau destiné à être chassé sur l'axe de balancier et percé latéralement pour recevoir l'extrémité intérieure du ressort spiral. L'axe de balancier peut également être soudé sur la virole. Le développement de techniques de micro-fabrication, comme les procédés DRIE pour le silicium, ont permis de fabriquer des viroles avec de nouvelles formes et géométries. Il est possible notamment de réaliser la virole d'une seule pièce avec le spiral.Generally, the introduction of the balance spring on the axis of the balance is done by means of a ferrule, which is in the form of a ring intended to be driven on the axis of balance and pierced laterally to receive the inner end of the spiral spring. The balance shaft can also be welded to the ferrule. The development of micro-manufacturing techniques, such as DRIE processes for silicon, made it possible to manufacture ferrules with new shapes and geometries. It is possible in particular to make the shell in one piece with the spiral.

Le silicium est un matériau présentant de nombreux avantages pour la fabrication des ressorts spiraux, et les techniques de micro-fabrication permettent de réaliser un ensemble monobloc ressort spiral/virole. Le principal inconvénient du silicium est qu'il ne possède pas de domaine de déformation plastique. La virole peut donc se casser aisément si les contraintes dépassent la limite élastique. Il faut ainsi dimensionner la virole à la fois pour maintenir le ressort spiral sur l'axe du balancier lors du fonctionnement de l'oscillateur (couple de serrage minimal) et aussi pour pouvoir assembler la virole avec des axes, sans se rompre (ou subir de déformation plastique) si le diamètre de l'axe du balancier et les variations géométriques de la virole restent à l'intérieur d'un intervalle de tolérance donné.Silicon is a material with many advantages for the manufacture of spiral springs, and micro-manufacturing techniques make it possible to produce a one-piece spiral spring / ferrule assembly. The main disadvantage of silicon is that it does not have a plastic deformation domain. The ferrule can therefore break easily if the stresses exceed the elastic limit. It is thus necessary to dimension the shell both to maintain the spiral spring on the axis of the balance during the operation of the oscillator (minimum torque) and also to be able to assemble the shell with axes, without breaking (or undergoing plastic deformation) if the diameter of the balance shaft and the geometric variations of the ferrule remain within a given tolerance range.

Les documents EP 1 513 029 et EP 2 003 523 proposent des viroles ayant une ouverture triangulaire. La fixation du spiral s'effectue en un point de rattachement situé à l'un des sommets des triangles. La virole est formée d'une structure de rigidification externe à laquelle sont rattachés des bras flexibles qui se déforment pour accommoder l'axe de balancier.The documents EP 1,513,029 and EP 2,003,523 propose ferrules having a triangular opening. The attachment of the spiral takes place at a point of attachment located at one of the vertices of the triangles. The ferrule is formed of an external stiffening structure to which are attached flexible arms which deform to accommodate the balance shaft.

On connaît également du document WO2011026725 un ensemble ressort spiral-virole, avec une virole présentant un alésage muni de quatre parties d'appui circulaires pour recevoir l'axe de balancier. Les parties d'appui sont délimitées par des rainures longitudinales réalisées dans l'alésage de la virole.Document is also known WO2011026725 a spiral-ferrule spring assembly, with a ferrule having a bore provided with four circular bearing parts for receiving the balance shaft. The bearing portions are delimited by longitudinal grooves formed in the bore of the ferrule.

Les géométries décrites dans ces documents ne donnent pas entièrement satisfaction, de sorte que nombre de spiraux (en silicium, diamant, quartz...) montés sur des mouvements sont munis d'une virole collée sur l'axe du balancier.The geometries described in these documents are not entirely satisfactory, so that many spirals (silicon, diamond, quartz ...) mounted on movements are provided with a ferrule glued on the axis of the balance.

Résumé de l'inventionSummary of the invention

Le but de la présente invention est de pallier tout ou partie les inconvénients cités précédemmentThe object of the present invention is to overcome all or part of the disadvantages mentioned above

A cet effet, l'invention se rapporte à une virole d'horlogerie comprenant un point de jonction avec un ressort spiral et un passage destiné à recevoir un arbre de balancier.For this purpose, the invention relates to a timepiece comprising a junction point with a spiral spring and a passage for receiving a balance shaft.

Selon l'invention, le passage est sensiblement cylindrique et est configuré pour se déformer élastiquement dans un plan perpendiculaire à l'axe du passage et serrer élastiquement l'arbre de balancier par au moins 2 lignes de contact s'étendant sur la hauteur de la paroi interne du passage lorsque l'arbre de balancier est introduit dans le passage.According to the invention, the passage is substantially cylindrical and is configured to deform elastically in a plane perpendicular to the axis of the passage and resiliently tighten the balance shaft by at least 2 contact lines extending over the height of the internal wall of the passage when the balance shaft is introduced into the passage.

On comprend ainsi qu'une telle virole permet d'avoir une force de chassage et un couple de maintien optimum, la force de déformation pinçant la virole sur l'axe au-dessus d'un couple de maintien nominal.It is thus understood that such a shell makes it possible to have a driving force and an optimum holding torque, the deformation force pinching the shell on the axis above a nominal holding torque.

Un avantage de l'invention est que l'on déforme la totalité de la virole, contrairement aux viroles de l'art antérieur, la virole ne comporte pas de nez ou autre partie rigide. Dans le cas de l'invention, la quasi-totalité de la virole se déforme, sauf le point d'attache de la virole.An advantage of the invention is that the entire ferrule is deformed, unlike ferrules of the prior art, the ferrule does not have a nose or other rigid part. In the case of the invention, almost all of the ferrule is deformed, except the point of attachment of the ferrule.

Conformément à d'autres variantes avantageuses de l'invention :

  • le passage est de forme ovoïde ;
  • les trois lignes de contact ont des ouvertures angulaires α, β, θ, l'une des lignes de contact étant diamétralement opposée au point d'attache avec le ressort spiral ;
  • les ouvertures angulaires α, β, θ sont supérieures à 90° ;
  • les ouvertures angulaires α, β, θ sont égales à 120° ;
  • la distance entre l'arbre de balancier et la virole au niveau des évidements est compris entre 0 et un quart du diamètre de l'arbre de balancier, et plus préférentiellement entre 0 et 50µm ;
  • la virole est de section variable.
According to other advantageous variants of the invention:
  • the passage is of ovoid shape;
  • the three contact lines have angular apertures α, β, θ, one of the contact lines being diametrically opposite to the point of attachment with the spiral spring;
  • the angular openings α, β, θ are greater than 90 °;
  • the angular openings α, β, θ are equal to 120 °;
  • the distance between the balance shaft and the ferrule at the level of the recesses is between 0 and a quarter of the diameter of the balance shaft, and more preferably between 0 and 50 μm;
  • the ferrule is of variable section.

L'invention concerne aussi un ensemble monobloc virole / ressort spiral comprenant une virole conforme à l'invention.The invention also relates to a one-piece ferrule / spiral spring assembly comprising a ferrule according to the invention.

Conformément à d'autres variantes avantageuses de l'invention :

  • la virole et le ressort spiral sont réalisés en silicium ;
  • la virole et le ressort spiral sont réalisés en un matériau ne présentant pas de déformation plastique.
According to other advantageous variants of the invention:
  • the shell and the spiral spring are made of silicon;
  • the shell and the spiral spring are made of a material having no plastic deformation.

L'invention concerne également un mouvement d'horlogerie ou une pièce d'horlogerie comprenant un ensemble monobloc virole - ressort spiral conforme à l'invention.The invention also relates to a watch movement or a timepiece comprising a one-piece ferrule-spiral spring assembly according to the invention.

Description sommaire des dessinsBrief description of the drawings

D'autres particularités et avantages ressortiront clairement de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux dessins annexés, dans lesquels :

  • la figure 1 est une représentation dans laquelle la virole est déformée élastiquement ;
  • la figure 2 est une représentation vue de dessus d'un ensemble virole / ressort spiral selon l'invention.
Other particularities and advantages will emerge clearly from the description which is given hereinafter, by way of indication and in no way limiting, with reference to the appended drawings, in which:
  • the figure 1 is a representation in which the ferrule is elastically deformed;
  • the figure 2 is a top view of a ferrule / spiral spring assembly according to the invention.

Description détaillée des modes de réalisation préférésDetailed Description of the Preferred Embodiments

Comme expliqué ci-dessus, l'invention se rapporte à une virole dont le matériau ne comporte pas de domaine plastique utilisable, c'est-à-dire avec un domaine plastique très restreint.As explained above, the invention relates to a ferrule whose material does not comprise a usable plastic field, that is to say with a very small plastic field.

L'ensemble virole-spiral illustré sur la figure 2 est réalisé en une seule pièce monobloc, typiquement en silicium. Il comporte une virole 1 et un ressort spiral 2 rattaché au niveau de sa spire intérieure 20 à un point d'attache S1 sur le pourtour de la virole 1. L'ensemble virole-spiral est maintenu sur un arbre de balancier 4 à section circulaire par chassage de la virole 1 sur cet arbre 4.The ferrule-spiral assembly illustrated on the figure 2 is made in one piece, typically silicon. It comprises a ferrule 1 and a spiral spring 2 attached at its inner turn 20 to a point of attachment S1 on the periphery of the ferrule 1. The ferrule-spiral assembly is held on a balance shaft 4 with circular section by driving the shell 1 on this shaft 4.

La virole 1 comporte un passage 10 sensiblement cylindrique, configuré pour se déformer élastiquement dans un plan P perpendiculaire à l'axe du passage 10 et ainsi recevoir et serrer élastiquement l'arbre 4 de balancier. Le passage flexible 10 est de forme ovalisée, et plus préférentiellement de forme « triangulaire ovalisée », et comprend au moins deux lignes de contact avec l'arbre de balancier 4.The shell 1 comprises a substantially cylindrical passage 10, configured to deform elastically in a plane P perpendicular to the axis of the passage 10 and thus receive and resiliently tighten the balance shaft 4. The flexible passage 10 is of oval shape, and more preferably of "oval triangular" shape, and comprises at least two lines of contact with the balance shaft 4.

Selon un exemple de réalisation préférentiel illustré sur les figures, le passage flexible 10 est de forme triangulaire ovale, et possède trois lignes de contact 11a, 11b et 11c avec l'arbre de balancier 4, les trois lignes de contact formant, par exemple, un triangle équilatéral. Les trois lignes de contact 11a, 11b, 11c avec l'arbre de balancier 4 forment entre elles des angles α, β et θ.According to a preferred embodiment illustrated in the figures, the flexible passage 10 is of triangular oval shape, and has three contact lines 11a, 11b and 11c with the balance shaft 4, the three contact lines forming, for example, an equilateral triangle. The three contact lines 11a, 11b, 11c with the balance shaft 4 form angles α, β and θ between them.

Les lignes de contact 11a, 11b et 11c délimitent des évidements 10a, 10b et 10c entre la virole 1 et l'arbre de balancier 4, ces évidements 10a, 10b et 10c étant des zones de non-contact.The contact lines 11a, 11b and 11c define recesses 10a, 10b and 10c between the ferrule 1 and the rocker shaft 4, these recesses 10a, 10b and 10c being non-contact zones.

Comme on peut l'observer sur la figure 1, l'une des lignes de contact est diamétralement opposée au point d'attache avec le ressort spiral 2, de cette manière la virole 1 ne subit pas de déformation au niveau du point d'attache et la localisation du point d'attache du ressort spiral 2 n'est pas modifiée lors de la mise en place de la virole 1.As can be seen on the figure 1 , one of the contact lines is diametrically opposed to the point of attachment with the spiral spring 2, in this way the shell 1 does not undergo deformation at the point of attachment and the location of the point of attachment of the spring spiral 2 is not modified during the introduction of the ferrule 1.

Selon l'invention, les trois lignes de contact 11a, 11b et 11c forment entre elles un angle α, β, θ qui est de préférence supérieur à 90 degrés, plus préférentiellement inférieur à 150 degrés, et est ici sensiblement égal à 120 degrés.According to the invention, the three contact lines 11a, 11b and 11c form between them an angle α, β, θ which is preferably greater than 90 degrees, more preferably less than 150 degrees, and is here substantially equal to 120 degrees.

Sous l'effet de la déformation élastique, le passage 10 exerce, au niveau des lignes de contact 11a, 11 b, 11 c, des forces de rappel élastique rappelant la paroi interne du passage en contact contre l'axe de balancier.Under the effect of the elastic deformation, the passage 10 exerts, at the level of the contact lines 11a, 11b, 11c, elastic return forces reminding the inner wall of the passage in contact against the balance shaft.

Selon l'invention, la distance entre l'arbre de balancier 4 et la virole 1 au niveau des évidements 10a, 10 et 10c est supérieur à 0. Il y a donc du serrage en au niveau des trois lignes de contact 11a, 11b et 11c mais pas de serrage au niveau des évidements 10a, 10b et 10c.According to the invention, the distance between the rocker shaft 4 and the shell 1 at the recesses 10a, 10 and 10c is greater than 0. There is therefore clamping at the three contact lines 11a, 11b and 11c but no clamping at the recesses 10a, 10b and 10c.

De préférence, la distance entre l'arbre de balancier 4 et la virole 1 au niveau des évidements 10a, 10 et 10c est compris entre 0 et un quart du diamètre de l'arbre de balancier 4. Encore plus préférentiellement, la distance entre l'arbre de balancier 4 et la virole 1 au niveau des évidements 10a, 10 et 10c est compris entre 0 et 50µm.Preferably, the distance between the rocker shaft 4 and the shell 1 at the recesses 10a, 10 and 10c is between 0 and a quarter of the diameter of the balance shaft 4. Even more preferably, the distance between the the balance shaft 4 and the ferrule 1 at the recesses 10a, 10 and 10c is between 0 and 50μm.

Avantageusement, la distance entre l'arbre de balancier 4 et la virole 1 permet de garantir un faible jeu alors qu'un serrage est appliqué au niveau des lignes de contact 11a, 11b et 11c.Advantageously, the distance between the balance shaft 4 and the ferrule 1 ensures a small clearance while a clamping is applied at the level of the contact lines 11a, 11b and 11c.

Un tel agencement a notamment pour avantage de maximiser le rayon d'appui du passage 10 de la virole 1 sur l'axe de l'arbre 4, tout en garantissant un couple de tenue suffisant sur l'arbre 4 de balancier, avec un niveau de contrainte inférieur à la contrainte maximale admissible pour le matériau. Avantageusement, un plus grand rayon d'appui permet d'obtenir un couple de maintien plus élevé.Such an arrangement has the particular advantage of maximizing the support radius of the passage 10 of the collar 1 on the axis of the shaft 4, while ensuring a sufficient holding torque on the balance shaft 4, with a level of less than the maximum permissible stress for the material. Advantageously, a greater support radius makes it possible to obtain a higher holding torque.

L'épaisseur est déterminée de manière que la contrainte maximale exercée par l'arbre 4 de balancier sur le passage 10 soit inférieure à la limite élastique du matériau formant la virole 1, que la virole 1 s'accommode des tolérances de fabrication de l'arbre de balancier 4 et que la tenue de la virole 1 sur l'arbre 4 (couple de rotation, force de chassage) soit adéquate.The thickness is determined so that the maximum stress exerted by the balance shaft 4 on the passage 10 is less than the elastic limit of the material forming the ferrule 1, that the ferrule 1 accommodates manufacturing tolerances of the balance shaft 4 and that the holding of the ferrule 1 on the shaft 4 (torque, driving force) is adequate.

Tel qu'illustré à la figure 2, le spiral 2 comporte une lame 3 enroulée sur elle-même selon plusieurs spires, la spire interne 20 étant venue de forme avec la virole 1.As illustrated in figure 2 , the hairspring 2 comprises a blade 3 wound on itself in a plurality of turns, the inner turn 20 having come into shape with the shell 1.

Comme visible à la figure 2, le point d'attache S1 entre la spire interne 20 et la virole 1 est situé sur la virole 1. On remarque également que la virole 1 est symétrique par rapport à l'axe A passant par le centre C de la virole 1 et le point d'attache S1.As visible at figure 2 , the point of attachment S1 between the inner coil 20 and the ferrule 1 is located on the shell 1. It is also noted that the ferrule 1 is symmetrical with respect to the axis A passing through the center C of the ferrule 1 and the attachment point S 1 .

Selon un mode de réalisation préférentiel de l'invention, la virole 1 et le ressort spiral 2 sont réalisés en silicium.According to a preferred embodiment of the invention, the shell 1 and the spiral spring 2 are made of silicon.

Selon un autre mode de réalisation de l'invention, la virole 1 et le ressort spiral 2 sont réalisés en un matériau ne présentant pas de déformation plastique, tel que du silicium monocristallin, du silicium polycristallin, du silicium poreux, du silicium amorphe, du silicium monocristallin dopé, du silicium polycristallin dopé, du carbure de silicium dopé ou non, du nitrure de silicium dopé ou non, de l'oxyde de silicium dopé ou non tel que le quartz ou de la silice, ou encore de la céramique.According to another embodiment of the invention, the ferrule 1 and the spiral spring 2 are made of a material having no plastic deformation, such as monocrystalline silicon, polycrystalline silicon, porous silicon, amorphous silicon, doped monocrystalline silicon, doped polycrystalline silicon, doped or non-doped silicon carbide, doped or non-doped silicon nitride, doped or non-doped silicon oxide such as quartz or silica, or ceramics.

La virole 1 et le ressort spiral 2 peuvent également être réalisés en un matériau tel que du métal amorphe.The ferrule 1 and the spiral spring 2 may also be made of a material such as amorphous metal.

Bien entendu, la présente invention ne se limite pas à l'exemple illustré mais est susceptible de diverses variantes et modifications qui apparaîtront à l'homme de l'art.Of course, the present invention is not limited to the illustrated example but is susceptible of various variations and modifications that will occur to those skilled in the art.

NOMENCLATURENOMENCLATURE

1.1.
Virole,Ferrule,
10.10.
Passage,Passage,
10a.10a.
Evidement,Obviously,
10b.10b.
Evidement,Obviously,
10c.10c.
Evidement,Obviously,
11a.11a.
Ligne de contact,Contact line,
11b.11b.
Ligne de contact,Contact line,
11c.11c.
Ligne de contact,Contact line,
2.2.
Ressort spiral,Spiral spring,
3.3.
Lame du ressort,Blade of the spring,
4.4.
Arbre de balancier,Balance tree,
α.α.
Angle,Angle,
β.β.
angle,angle,
θ.θ.
Angle,Angle,
S1.S1.
Point d'attache,Attachment point,
C.vs.
Centre de la virole,Center of the shell,
Da.Da.
Diamètre de l'arbre.Diameter of the tree.

Claims (11)

Virole (1) d'horlogerie comprenant un point d'attache (S1) avec un ressort spiral (2) et un passage (10) destiné à recevoir un arbre (4) de balancier,
caractérisé en ce que le passage (10) est sensiblement cylindrique et est configuré pour se déformer élastiquement dans un plan (9) perpendiculaire à l'axe du passage (10) et serrer élastiquement l'arbre (4) de balancier par au moins deux lignes (11a, 11 b, 11 c) de contact s'étendant sur la hauteur de la paroi interne du passage (10) lorsque l'arbre (4) de balancier est introduit dans le passage (10).Clock ring (1) comprising an attachment point (S1) with a spiral spring (2) and a passage (10) for receiving a balance shaft (4),
characterized in that the passage (10) is substantially cylindrical and is configured to deform elastically in a plane (9) perpendicular to the axis of the passage (10) and elastically tighten the rocker shaft (4) by at least two contact lines (11a, 11b, 11c) extending over the height of the inner wall of the passage (10) when the balance shaft (4) is introduced into the passage (10). Virole (1) selon la revendication 1, dans laquelle le passage (10) est de forme ovoïde.Ferrule (1) according to claim 1, wherein the passage (10) is ovoid. Virole (1) selon la revendication 1 ou 2, dans laquelle les trois lignes de contact (11a, 11b, 11c) ont des ouvertures angulaires α, β, θ, l'une des lignes de contact () étant diamétralement opposée au point d'attache (S1) avec le ressort spiral.Ferrule (1) according to claim 1 or 2, wherein the three contact lines (11a, 11b, 11c) have angular apertures α, β, θ, one of the contact lines () being diametrically opposed to the point d fastener (S1) with the spiral spring. Virole (1) selon la revendication 3, dans laquelle les ouvertures angulaires α, β, θ sont supérieures à 90°.Ferrule (1) according to claim 3, wherein the angular apertures α, β, θ are greater than 90 °. Virole (1) selon la revendication 3, dans laquelle les ouvertures angulaires α, β, θ sont égales à 120°.Ferrule (1) according to claim 3, wherein the angular apertures α, β, θ are equal to 120 °. Virole (1) selon l'une quelconque des revendications 1 à 5, dans laquelle la distance entre l'arbre de balancier 4 et la virole 1 au niveau des passages 10a, 10 et 10c est compris entre 0 et un quart du diamètre de l'arbre de balancier 4, et plus préférentiellement entre 0 et 50µm.Ferrule (1) according to any one of claims 1 to 5, wherein the distance between the rocker shaft 4 and the shell 1 at the passages 10a, 10 and 10c is between 0 and a quarter of the diameter of the balance shaft 4, and more preferably between 0 and 50 μm. Virole (1) selon l'une quelconque des revendications 1 à 6 comprenant une section variable.Ferrule (1) according to any one of claims 1 to 6 comprising a variable section. Ensemble monobloc virole - ressort spiral comprenant une virole (1) telle que revendiquée selon les revendications précédentes.Monobloc ferrule assembly - spiral spring comprising a ferrule (1) as claimed in the preceding claims. Ensemble monobloc virole - ressort spiral selon la revendication 8, dans lequel la virole (1) et le ressort spiral (2) sont réalisés en silicium.Monobloc ferrule-spiral spring assembly according to claim 8, wherein the ferrule (1) and the spiral spring (2) are made of silicon. Ensemble monobloc virole - ressort spiral selon la revendication 8 ou 9, dans lequel la virole (1) et le ressort spiral (2) sont réalisés en un matériau ne présentant pas de déformation plastique.Monobloc ferrule-spiral spring assembly according to claim 8 or 9, wherein the ferrule (1) and the spiral spring (2) are made of a material having no plastic deformation. Mouvement d'horlogerie ou pièce d'horlogerie comprenant un ensemble monobloc virole - ressort spiral selon l'une quelconque des revendications 8 à 10.Watchmaking movement or timepiece comprising a one-piece ferrule-spiral spring assembly according to any one of claims 8 to 10.
EP14194118.7A 2014-11-20 2014-11-20 Flexible ferrule Active EP3023844B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP14194118.7A EP3023844B1 (en) 2014-11-20 2014-11-20 Flexible ferrule
JP2015222829A JP6275102B2 (en) 2014-11-20 2015-11-13 Flexible beard ball
TW104137894A TWI685728B (en) 2014-11-20 2015-11-17 Collet and one-piece balance spring assembly, timepiece movement and timepiece having the same
CN201510795202.4A CN105629697B (en) 2014-11-20 2015-11-18 Stake in flexibility
US14/944,790 US9658599B2 (en) 2014-11-20 2015-11-18 Flexible collet
KR1020150162775A KR101787838B1 (en) 2014-11-20 2015-11-19 Flexible collet
HK16110593.2A HK1222461A1 (en) 2014-11-20 2016-09-06 Flexible collet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14194118.7A EP3023844B1 (en) 2014-11-20 2014-11-20 Flexible ferrule

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EP3023844A1 true EP3023844A1 (en) 2016-05-25
EP3023844B1 EP3023844B1 (en) 2017-06-28

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EP (1) EP3023844B1 (en)
JP (1) JP6275102B2 (en)
KR (1) KR101787838B1 (en)
CN (1) CN105629697B (en)
HK (1) HK1222461A1 (en)
TW (1) TWI685728B (en)

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JP2016099350A (en) 2016-05-30
HK1222461A1 (en) 2017-06-30
JP6275102B2 (en) 2018-02-07
TW201638682A (en) 2016-11-01
EP3023844B1 (en) 2017-06-28
US9658599B2 (en) 2017-05-23
KR101787838B1 (en) 2017-11-15
TWI685728B (en) 2020-02-21
CN105629697A (en) 2016-06-01
CN105629697B (en) 2018-10-02
KR20160060584A (en) 2016-05-30
US20160147197A1 (en) 2016-05-26

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