EP4033307A1 - Assembly comprising a rotating moving part made of non-magnetic material and a bearing provided with a cone - Google Patents

Assembly comprising a rotating moving part made of non-magnetic material and a bearing provided with a cone Download PDF

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Publication number
EP4033307A1
EP4033307A1 EP21152892.2A EP21152892A EP4033307A1 EP 4033307 A1 EP4033307 A1 EP 4033307A1 EP 21152892 A EP21152892 A EP 21152892A EP 4033307 A1 EP4033307 A1 EP 4033307A1
Authority
EP
European Patent Office
Prior art keywords
assembly
magnetic material
copper
entre
palladium
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.)
Pending
Application number
EP21152892.2A
Other languages
German (de)
French (fr)
Inventor
Cyril RUCHTI
Xavier BERDAT
Frédéric Kohler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
ETA SA Manufacture Horlogere Suisse
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ETA SA Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to EP21152892.2A priority Critical patent/EP4033307A1/en
Priority to US17/646,317 priority patent/US20220235438A1/en
Priority to JP2022001390A priority patent/JP2022113124A/en
Priority to KR1020220006057A priority patent/KR20220106692A/en
Priority to CN202210066173.8A priority patent/CN114815566A/en
Publication of EP4033307A1 publication Critical patent/EP4033307A1/en
Priority to JP2023137273A priority patent/JP2023153390A/en
Pending legal-status Critical Current

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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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/004—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor characterised by the material used
    • G04B31/008—Jewel bearings
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/04—Alloys based on a platinum group metal
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/06—Alloys based on silver
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/06—Alloys based on silver
    • C22C5/08—Alloys based on silver with copper as the next major constituent
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • 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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/004—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor characterised by the material used
    • 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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/004—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor characterised by the material used
    • G04B31/008—Jewel bearings
    • G04B31/0082—Jewel bearings with jewel hole and cap jewel
    • 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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/06—Manufacture or mounting processes
    • 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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/08—Lubrication
    • 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
    • G04B43/00—Protecting clockworks by shields or other means against external influences, e.g. magnetic fields
    • G04B43/007—Antimagnetic alloys

Definitions

  • the invention relates to an assembly comprising a rotating mobile fitted with a pivot made of non-magnetic material and a bearing fitted with a cone, in particular for a timepiece.
  • the invention also relates to a timepiece comprising such an assembly.
  • revolving mobiles such as pendulums
  • pendulums generally comprise two pivots, the ends of which are inserted into stones in order to be able to rotate.
  • stones of the ruby or sapphire type are used to form counter-pivots or guide elements called bearings.
  • the bearings can also be metallic. These counter-pivots and guide elements are intended to come into contact with the pivots in order to make the latter mobile in rotation and this, with minimal friction. Thus, they form, for example, all or part of a bearing of the mobile shaft mounted in rotation.
  • synthetic stones are used in watch movements.
  • the Verneuil-type process is known for manufacturing stones of the monocrystalline type.
  • stones of the polycrystalline type which are manufactured by pressing a precursor with a view to obtaining a green body of the future stone from a pressing tool.
  • the stones serving as a rotation guide element of a pivot generally have a through hole in which the pivot is inserted to rest on a counter-pivot. It is known to form a substantially hemispherical hollow around the hole on the pivot insertion face to facilitate insertion of the pivot. In addition, it allows the pivot to be put back in place in the event that it comes out due to a shock.
  • the hollow is, for example, obtained by turning with a diamond chisel.
  • the figure 1 is an example of the prior art, of an assembly 1 comprising a stone 2 provided with a hole 3 and a hemispherical hollow 4 forming the entrance to the hole 3.
  • the assembly 1 further comprises a pivot 7 configured to be inserted into the hole 3 to allow the rotation of a movable element, not shown in the figure.
  • magnetism is a major problem for watch movements, because it affects the precision of the movements.
  • it is also known to use non-magnetic materials to form certain parts of the movement.
  • these non-magnetic materials make it possible to produce rotating mobile shafts, which avoid magnetization of the pivot.
  • non-magnetic materials are often less hard than the magnetic metals usually used for rotating spindles.
  • a protruding edge is present at the edge of the hole, so that a pivot made of a soft non-magnetic material can be damaged by said edge, when the pivot comes out of the hole and enters it again, by example under the effect of a shock. After several shocks of this type, the pivot quickly undergoes premature wear, which will have repercussions on the precision of the movement thereafter.
  • the object of the present invention is to overcome all or part of the drawbacks mentioned above, by proposing an assembly, in particular for a timepiece, comprising a rotating wheel and a bearing, such as a stone, the rotating wheel being provided with at at least one pivot comprising at least partly a non-magnetic material, preferably entirely, the bearing comprising a face provided with a hole formed in the body of the bearing and with a functional geometry at the entrance to the hole.
  • the assembly is remarkable in that the functional geometry has a cone shape, and in that the non-magnetic material of the pivot comprises an alloy to be chosen from materials based on copper, materials based on palladium or aluminum materials.
  • this assembly it is possible to use soft non-magnetic materials for the pivots of rotating mobiles, because the conical entry of the hole avoids the risk of premature wear of the pivot in the event of shocks. Indeed, the edge bordering the hole and the cone is much less prominent, so that the pivot will not be damaged if it leaves the hole and re-enters it following a shock.
  • materials such as copper-based, palladium-based or aluminum-based alloys are particularly well suited for this use.
  • the non-magnetic material has a Vickers hardness of less than 500 HV, preferably less than 450 HV, or even less than 400 HV.
  • the non-magnetic material is a copper-based alloy of the CuBe2 type.
  • the non-magnetic material is an alloy comprising by weight: between 30% and 40% palladium, between 25% and 35% silver, between 10% and 18% copper, between 0.5% and 1.5% zinc, and the alloy comprises gold and platinum by weight with a total percentage of these two elements between 16% and 24%.
  • the non-magnetic material is an alloy comprising by weight between 38% and 43% palladium, between 35% and 40% silver, between 18% and 23% copper, and between 0.5% and 1.5% zinc.
  • the stone comprises alumina Al 2 O 3 or zirconia ZrO 2 .
  • the stone comprises an upper face and a lower face, the lower face comprising the cone.
  • the hole is through so as to connect said cone to the upper face of said stone.
  • the invention also relates to a timepiece comprising such an assembly.
  • the invention relates to an assembly comprising a rotating wheel set and a bearing, such as a stone, in particular for a timepiece.
  • the stone is intended to come into contact with a pivot of the rotating mobile, in order to make the latter mobile in rotation with minimal friction.
  • such an assembly cannot be limited to the watchmaking field and can be applied to any mounted part that is mobile relative to a bearing.
  • the stone is preferably formed from alumina or zirconia, with a crystallographic structure of monocrystalline or polycrystalline type.
  • the stone forms, for example, a guide element intended to be mounted in a damping bearing of a timepiece.
  • the stone 20 of the assembly 10 is traversed by a hole 8 intended to receive a pivot 17, also called pin.
  • the stone 20 comprises an upper face 5 and a lower face 6, one of which comprises a cone 12 communicating with the through hole 8.
  • the hole 8 communicates with the upper face 5 and also with a substantially conical recess defined in the underside 6. This recess then forms an engagement cone for the pierced stone 20.
  • the cone 12 preferably has rotational symmetry.
  • Cone 12 has a first opening 19 at its base and a second opening at its top. The first opening 19 is larger than the second, and is formed in the lower face 6 of the stone 20.
  • the connection of the cone 12 and the hole 8 is carried out by the second opening to form an edge 15.
  • the widening of the cone 12 makes it possible to easily insert the pivot 17 of the shaft 16 of a rotating part, in particular in the event of an impact.
  • the angle of the cone is chosen to prevent the edge 15 formed by the top of the cone and the hole 8 from projecting too much. For example, an angle of between 30° and 120°, preferably between 45° and 90°, is chosen.
  • an internal wall of the body of this stone 20 defined at the level of the hole 8 comprises a rounded zone intended to minimize contact with the pivot but also to facilitate possible lubrication.
  • the upper face 5 of the stone comprises a rim 18, in particular to enclose laterally a counter-pivot in the case of a landing.
  • the rim 18 is preferably peripheral, that is to say it delimits the edge of the upper face 5 of the stone 20.
  • it defines an internal zone 9 of the upper face 5 comprising a face of support 11 and the outlet of the through hole 8, and a concentrically convex zone 9 from the support face 11 to the hole 8.
  • An upper face 5 with such a rim 18 makes it possible, for example, to block laterally an element arranged on the upper face of the stone 20.
  • a counter-pivot stone can be arranged so that it is blocked laterally by the internal side of the rim 18 while resting on the bearing face 11.
  • the counter-pivot stone is sized to correspond to the zone 9 of stone 10.
  • the stone thus forms an axial and radial support for a counter-pivot.
  • the counter-pivot not shown in the figures, can be fitted into stone 10 to support it axially and hold it laterally.
  • the stone 10 has a partially flared peripheral face 13 connecting the lower face 6 of smaller surface to the upper face 5 of larger surface.
  • the picture 3 shows an alternative embodiment of a stone 30 of a set.
  • the stone 30 has a different shape, the upper face 25 being curved and the lower face 26 being substantially planar. This stone 30 does not include an edge, and must be inserted into a specific ring (or bezel).
  • the through hole 28 and the cone 22 are similar to those of the figure 2 .
  • the rotating mobile is provided with a pivot comprising at least partly a non-magnetic material, preferably entirely.
  • the non-magnetic material makes it possible to limit the sensitivity of the pivot to magnetic fields.
  • the non-magnetic material of the pivot comprises a metal alloy to be chosen from materials based on copper, based on palladium, or materials based on aluminium.
  • the non-magnetic material included in the pivot is soft, that is to say it has a Vickers hardness of less than 500 HV, preferably less than 450 HV, or even less than 400 HV or 350HV.
  • the non-magnetic material is a “soft” material compared to the harder metallic materials used to form the pivots of the usual rotary mobiles.
  • the non-magnetic material comprises an alloy of copper and beryllium, of the CuBe2 type.
  • the pivot is formed substantially entirely from this alloy of copper and beryllium.
  • the alloy generally comprises at least 90% copper, even at least 95% copper, and even up to 98% copper, which is supplemented by beryllium.
  • the non-magnetic material is an alloy made up by weight of 35% palladium, 30% silver, 14% copper, 10% gold, 10% platinum and 1% zinc.
  • the non-magnetic material is an alloy comprising 41% palladium, 37.5% silver, 20% copper, 1% zinc and 0.5% platinum.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Adornments (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
  • Braking Arrangements (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)

Abstract

L'invention concerne un ensemble (10), notamment pour une pièce d'horlogerie, comprenant un mobile tournant et un coussinet, telle une pierre (20), le mobile tournant étant muni d'au moins un pivot (17) comportant au moins en partie un matériau amagnétique, de préférence en totalité, le coussinet comportant une face (6) pourvue d'un trou (8) formé dans le corps du coussinet et d'une géométrie fonctionnelle à l'entrée du trou (8), caractérisée en ce que la géométrie fonctionnelle a une forme de cône (12), et en ce que le matériau amagnétique du pivot (17) comprend un alliage à choisir parmi des matériaux à base de cuivre, des matériaux à base de palladium ou des matériaux à base d'aluminium.The invention relates to an assembly (10), in particular for a timepiece, comprising a rotating wheel and a bearing, such as a stone (20), the rotating wheel being provided with at least one pivot (17) comprising at least partly a non-magnetic material, preferably entirely, the bearing comprising a face (6) provided with a hole (8) formed in the body of the bearing and with a functional geometry at the entrance of the hole (8), characterized in that the functional geometry has the shape of a cone (12), and in that the non-magnetic material of the pivot (17) comprises an alloy to be chosen from materials based on copper, materials based on palladium or materials with aluminum base.

Description

Domaine de l'inventionField of the invention

L'invention porte sur un ensemble comprenant un mobile tournant muni d'un pivot en matériau amagnétique et un coussinet muni d'un cône, notamment pour une pièce d'horlogerie.The invention relates to an assembly comprising a rotating mobile fitted with a pivot made of non-magnetic material and a bearing fitted with a cone, in particular for a timepiece.

L'invention porte également sur une pièce d'horlogerie comportant un tel ensemble.The invention also relates to a timepiece comprising such an assembly.

Arrière-plan de l'inventionBackground of the invention

Dans l'état de la technique de l'horlogerie, les mobiles tournants, tels que des balanciers, comportent généralement deux pivots dont les extrémités sont insérées dans des pierres pour pouvoir tourner. Généralement, on utilise des pierres de type rubis ou saphir, pour former des contre-pivots ou des éléments de guidage appelés coussinets. Les coussinets peuvent aussi être métalliques. Ces contre-pivots et éléments de guidage sont destinés à entrer en contact avec les pivots afin de rendre ces derniers mobiles en rotation et ce, avec un frottement minimal. Ainsi, ils forment, par exemple, tout ou partie d'un palier de l'arbre du mobile monté en rotation.In the state of the watchmaking technique, revolving mobiles, such as pendulums, generally comprise two pivots, the ends of which are inserted into stones in order to be able to rotate. Generally, stones of the ruby or sapphire type are used to form counter-pivots or guide elements called bearings. The bearings can also be metallic. These counter-pivots and guide elements are intended to come into contact with the pivots in order to make the latter mobile in rotation and this, with minimal friction. Thus, they form, for example, all or part of a bearing of the mobile shaft mounted in rotation.

En principe, on utilise des pierres synthétiques dans les mouvements horlogers. On connait en particulier le procédé de type Verneuil pour fabriquer des pierres de type monocristallines. Il existe aussi les pierres de type poly-cristallines, que l'on fabrique par pressage d'un précurseur en vue de l'obtention d'un corps vert de la future pierre à partir d'un outil de pressage.In principle, synthetic stones are used in watch movements. In particular, the Verneuil-type process is known for manufacturing stones of the monocrystalline type. There are also stones of the polycrystalline type, which are manufactured by pressing a precursor with a view to obtaining a green body of the future stone from a pressing tool.

Les pierres servant d'élément de guidage en rotation d'un pivot ont, généralement, un trou traversant dans lequel le pivot est inséré pour prendre appui sur un contre-pivot. Il est connu de former une creusure sensiblement hémisphérique autour du trou sur la face d'insertion du pivot pour faciliter l'insertion du pivot. En outre, il permet de remettre le pivot en place au cas où ce dernier sortirait à cause d'un choc. La creusure est, par exemple, obtenue par tournage avec un burin diamanté.The stones serving as a rotation guide element of a pivot generally have a through hole in which the pivot is inserted to rest on a counter-pivot. It is known to form a substantially hemispherical hollow around the hole on the pivot insertion face to facilitate insertion of the pivot. In addition, it allows the pivot to be put back in place in the event that it comes out due to a shock. The hollow is, for example, obtained by turning with a diamond chisel.

La figure 1 est un exemple de l'art antérieur, d'un ensemble 1 comprenant une pierre 2 munie d'un trou 3 et d'une creusure hémisphérique 4 formant l'entrée du trou 3. L'ensemble 1 comprend encore un pivot 7 configuré pour être inséré dans le trou 3 afin de permettre la rotation d'un élément mobile, non représenté sur la figure.The figure 1 is an example of the prior art, of an assembly 1 comprising a stone 2 provided with a hole 3 and a hemispherical hollow 4 forming the entrance to the hole 3. The assembly 1 further comprises a pivot 7 configured to be inserted into the hole 3 to allow the rotation of a movable element, not shown in the figure.

D'autre part, le magnétisme est un problème important pour des mouvements d'horlogerie, car il nuit à la précision des mouvements. Pour résoudre ce problème, il est également connu d'utiliser des matériaux amagnétiques pour former certaines parties du mouvement. Ainsi, ces matériaux amagnétiques permettent de produire des arbres de mobiles tournants, qui évitent une magnétisation du pivot.On the other hand, magnetism is a major problem for watch movements, because it affects the precision of the movements. To solve this problem, it is also known to use non-magnetic materials to form certain parts of the movement. Thus, these non-magnetic materials make it possible to produce rotating mobile shafts, which avoid magnetization of the pivot.

Cependant, les matériaux amagnétiques sont souvent moins durs que les métaux magnétiques usuellement utilisés pour les mobiles tournants. Or, avec une telle creusure, une arête saillante est présente au bord du trou, de sorte qu'un pivot fait d'un matériau amagnétique mou peut être abîmé par ladite arête, lorsque le pivot sort du trou et y rentre à nouveau, par exemple sous l'effet d'un choc. Après plusieurs chocs de ce type, le pivot subit rapidement une usure prématurée, qui aura des répercussions sur la précision du mouvement par la suite.However, non-magnetic materials are often less hard than the magnetic metals usually used for rotating spindles. However, with such a hollow, a protruding edge is present at the edge of the hole, so that a pivot made of a soft non-magnetic material can be damaged by said edge, when the pivot comes out of the hole and enters it again, by example under the effect of a shock. After several shocks of this type, the pivot quickly undergoes premature wear, which will have repercussions on the precision of the movement thereafter.

Résumé de l'inventionSummary of the invention

Le but de la présente invention est de palier tout ou partie des inconvénients cités précédemment, en proposant un ensemble, notamment pour une pièce d'horlogerie, comprenant un mobile tournant et un coussinet, telle une pierre, le mobile tournant étant muni d'au moins un pivot comportant au moins en partie un matériau amagnétique, de préférence en totalité, le coussinet comportant une face pourvue d'un trou formé dans le corps du coussinet et d'une géométrie fonctionnelle à l'entrée du trou.The object of the present invention is to overcome all or part of the drawbacks mentioned above, by proposing an assembly, in particular for a timepiece, comprising a rotating wheel and a bearing, such as a stone, the rotating wheel being provided with at at least one pivot comprising at least partly a non-magnetic material, preferably entirely, the bearing comprising a face provided with a hole formed in the body of the bearing and with a functional geometry at the entrance to the hole.

À cet effet, l'ensemble est remarquable en ce que la géométrie fonctionnelle a une forme de cône, et en ce que le matériau amagnétique du pivot comprend un alliage à choisir parmi des matériaux à base de cuivre, des matériaux à base de palladium ou des matériaux à base d'aluminium.To this end, the assembly is remarkable in that the functional geometry has a cone shape, and in that the non-magnetic material of the pivot comprises an alloy to be chosen from materials based on copper, materials based on palladium or aluminum materials.

Grâce à cet ensemble, on peut utiliser des matériaux amagnétiques mous pour des pivots de mobiles tournants, car l'entrée conique du trou évite le risque d'usure prématurée du pivot en cas de chocs. En effet, l'arrête bordant le trou et le cône est beaucoup moins saillante, de sorte que le pivot ne sera pas endommagé s'il sort du trou et y rentre à nouveau suite à un choc. En outre les matériaux tels que les alliages à base de cuivre, à base de palladium, ou à base d'aluminium sont particulièrement bien adaptés pour cette utilisation.Thanks to this assembly, it is possible to use soft non-magnetic materials for the pivots of rotating mobiles, because the conical entry of the hole avoids the risk of premature wear of the pivot in the event of shocks. Indeed, the edge bordering the hole and the cone is much less prominent, so that the pivot will not be damaged if it leaves the hole and re-enters it following a shock. In addition, materials such as copper-based, palladium-based or aluminum-based alloys are particularly well suited for this use.

Selon un mode de réalisation particulier de l'invention, le matériau amagnétique a une dureté de Vickers inférieure à 500HV, de préférence inférieure à 450 HV, voire inférieure à 400 HV.According to a particular embodiment of the invention, the non-magnetic material has a Vickers hardness of less than 500 HV, preferably less than 450 HV, or even less than 400 HV.

Selon un mode de réalisation particulier de l'invention, le matériau amagnétique est un alliage à base de cuivre de type CuBe2.According to a particular embodiment of the invention, the non-magnetic material is a copper-based alloy of the CuBe2 type.

Selon un mode de réalisation particulier de l'invention, le matériau amagnétique est un alliage à base de palladium comprenant en poids :

  • entre 25% et 55% de palladium,
  • entre 25% et 55% d'argent,
  • entre 10% et 30% de cuivre,
  • entre 0.5% et 5% de zinc,
  • de l'or et du platine avec un pourcentage total de ces deux éléments compris entre 5% et 25%,
  • entre 0% et 1% d'un ou plusieurs éléments choisis parmi bore et nickel,
  • entre 0% et 3% d'un ou plusieurs éléments choisis parmi le rhénium et le ruthénium
  • au maximum 0,1% d'un ou plusieurs éléments choisis parmi l'iridium, l'osmium, et le rhodium et
  • au maximum 0,2% d'autres impuretés, les quantités respectives des composants étant telles qu'additionnées entre elles, atteignent 100%.
According to a particular embodiment of the invention, the non-magnetic material is a palladium-based alloy comprising by weight:
  • between 25% and 55% palladium,
  • between 25% and 55% silver,
  • between 10% and 30% copper,
  • between 0.5% and 5% zinc,
  • gold and platinum with a total percentage of these two elements between 5% and 25%,
  • between 0% and 1% of one or more elements chosen from boron and nickel,
  • between 0% and 3% of one or more elements chosen from rhenium and ruthenium
  • a maximum of 0.1% of one or more elements chosen from iridium, osmium and rhodium and
  • not more than 0.2% of other impurities, the respective amounts of the components being as added together, reach 100%.

Selon un mode de réalisation particulier de l'invention, le matériau amagnétique est un alliage comprenant en poids : entre 30% et 40% de palladium, entre 25% et 35% d'argent, entre 10% et 18% de cuivre, entre 0.5% et 1.5% de zinc, et l'alliage comprend en poids de l'or et du platine avec un pourcentage total de ces deux éléments compris entre 16% et 24%.According to a particular embodiment of the invention, the non-magnetic material is an alloy comprising by weight: between 30% and 40% palladium, between 25% and 35% silver, between 10% and 18% copper, between 0.5% and 1.5% zinc, and the alloy comprises gold and platinum by weight with a total percentage of these two elements between 16% and 24%.

Selon un mode de réalisation particulier de l'invention, le matériau amagnétique est un alliage comprenant en poids :

  • entre 34% et 36% de palladium,
  • entre 29% et 31% d'argent,
  • entre 13,5% et 14,5% de cuivre,
  • entre 0.8% et 1,2% de zinc,
  • entre 9,5% et 10,5% d'or
  • entre 9,5% et 10,5% de platine,
  • au maximum 0,1% d'un ou plusieurs éléments choisis parmi l'iridium, l'osmium, le rhodium et le ruthénium et
  • au maximum 0,2% d'autres impuretés les quantités respectives des composants étant telles qu'additionnées entre elles, atteignent 100%.
According to a particular embodiment of the invention, the non-magnetic material is an alloy comprising by weight:
  • between 34% and 36% palladium,
  • between 29% and 31% silver,
  • between 13.5% and 14.5% copper,
  • between 0.8% and 1.2% zinc,
  • between 9.5% and 10.5% gold
  • between 9.5% and 10.5% platinum,
  • a maximum of 0.1% of one or more elements chosen from iridium, osmium, rhodium and ruthenium and
  • not more than 0.2% of other impurities, the respective amounts of the components being as added together, reach 100%.

Selon un mode de réalisation particulier de l'invention, le matériau amagnétique est un alliage à base de palladium comprenant en poids :

  • entre 25% et 55% de palladium
  • entre 25% et 55% d'argent,
  • entre 10% et 30% de cuivre,
  • entre 0% et 5% de zinc,
  • entre 0% et 2% d'un ou plusieurs éléments choisis parmi rhénium, ruthénium, or et platine,
  • entre 0% et 1 % d'un ou plusieurs éléments choisis parmi le bore et le nickel.
According to a particular embodiment of the invention, the non-magnetic material is a palladium-based alloy comprising by weight:
  • between 25% and 55% palladium
  • between 25% and 55% silver,
  • between 10% and 30% copper,
  • between 0% and 5% zinc,
  • between 0% and 2% of one or more elements chosen from rhenium, ruthenium, gold and platinum,
  • between 0% and 1% of one or more elements chosen from boron and nickel.

Selon un mode de réalisation particulier de l'invention, le matériau amagnétique est un alliage comprenant en poids entre 38% et 43% de palladium, entre 35% et 40% d'argent, entre 18% et 23% de cuivre, et entre 0.5% et 1.5% de zinc.According to a particular embodiment of the invention, the non-magnetic material is an alloy comprising by weight between 38% and 43% palladium, between 35% and 40% silver, between 18% and 23% copper, and between 0.5% and 1.5% zinc.

Selon un mode de réalisation particulier de l'invention, le matériau amagnétique est un alliage à base d'aluminium comprenant en poids :

  • entre 83% et 94.5% d'aluminium,
  • entre 4% et 7% de zinc,
  • entre 1% et 4% de magnésium,
  • entre 0.5% et 3% de cuivre,
  • entre 0% et 3% d'un ou plusieurs éléments choisis parmi le chrome, le silicium, le manganèse, le titane et le fer.
According to a particular embodiment of the invention, the non-magnetic material is an aluminum-based alloy comprising by weight:
  • between 83% and 94.5% aluminum,
  • between 4% and 7% zinc,
  • between 1% and 4% magnesium,
  • between 0.5% and 3% copper,
  • between 0% and 3% of one or more elements chosen from chromium, silicon, manganese, titanium and iron.

Selon un mode de réalisation particulier de l'invention, le matériau amagnétique est un alliage comprenant en poids :

  • entre 87.32% et 91.42% d'aluminium,
  • entre 5.1% et 6.1% de zinc,
  • entre 2.1% et 2.9% de magnésium,
  • entre 1.2% et 2% de cuivre,
  • entre 0.18% et 0.28% de chrome,
  • entre 0% et 0.4% de silicium,
  • entre 0% et 0.3% de manganèse,
  • entre 0% et 0.2% de titane, et
  • entre 0% et 0.5% de fer.
According to a particular embodiment of the invention, the non-magnetic material is an alloy comprising by weight:
  • between 87.32% and 91.42% aluminum,
  • between 5.1% and 6.1% zinc,
  • between 2.1% and 2.9% magnesium,
  • between 1.2% and 2% copper,
  • between 0.18% and 0.28% chromium,
  • between 0% and 0.4% silicon,
  • between 0% and 0.3% manganese,
  • between 0% and 0.2% titanium, and
  • between 0% and 0.5% iron.

Selon un mode de réalisation particulier de l'invention, la pierre comprend de l'alumine Al2O3 ou de la zircone ZrO2.According to a particular embodiment of the invention, the stone comprises alumina Al 2 O 3 or zirconia ZrO 2 .

Selon un mode de réalisation particulier de l'invention, la pierre comprend une face supérieure et une face inférieure, la face inférieure comportant le cône.According to a particular embodiment of the invention, the stone comprises an upper face and a lower face, the lower face comprising the cone.

Selon un mode de réalisation particulier de l'invention, le trou est traversant de manière à relier ledit cône à la face supérieure de ladite pierre.According to a particular embodiment of the invention, the hole is through so as to connect said cone to the upper face of said stone.

L'invention porte également sur une pièce d'horlogerie comprenant un tel ensemble.The invention also relates to a timepiece comprising such an assembly.

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 schématique d'un ensemble comprenant une pierre et un pivot d'un mobile tournant connu de l'état de l'art ;
  • la figure 2 est une représentation schématique d'un ensemble comprenant une pierre et un pivot d'un mobile tournant selon un premier mode de réalisation de l'invention ;
  • la figure 3 est une représentation schématique d'une pierre selon un deuxième mode de réalisation de l'invention.
Other features and advantages will emerge clearly from the description given below, by way of indication and in no way limiting, with reference to the appended drawings, in which:
  • the figure 1 is a schematic representation of an assembly comprising a stone and a pivot of a rotary wheel known from the state of the art;
  • the figure 2 is a schematic representation of an assembly comprising a stone and a pivot of a rotating wheel set according to a first embodiment of the invention;
  • the picture 3 is a schematic representation of a stone according to a second embodiment of the invention.

Description détaillée des modes de réalisation préférésDetailed Description of Preferred Embodiments

Comme expliqué ci-dessus, l'invention se rapporte à un ensemble comprenant un mobile tournant et un coussinet, telle une pierre, notamment pour une pièce d'horlogerie. La pierre est destinée à entrer en contact avec un pivot du mobile tournant, afin de rendre ce dernier mobile en rotation avec un frottement minimal. Toutefois, un tel ensemble ne saurait se limiter au domaine horloger et peut s'appliquer à toute pièce montée mobile par rapport à un palier.As explained above, the invention relates to an assembly comprising a rotating wheel set and a bearing, such as a stone, in particular for a timepiece. The stone is intended to come into contact with a pivot of the rotating mobile, in order to make the latter mobile in rotation with minimal friction. However, such an assembly cannot be limited to the watchmaking field and can be applied to any mounted part that is mobile relative to a bearing.

La pierre est formée de préférence à partir d'alumine ou de zircone, avec une structure cristallographique de type monocristalline ou polycristalline. La pierre forme par exemple un élément de guidage destiné à être monté dans un palier amortisseur d'une pièce d'horlogerie.The stone is preferably formed from alumina or zirconia, with a crystallographic structure of monocrystalline or polycrystalline type. The stone forms, for example, a guide element intended to be mounted in a damping bearing of a timepiece.

Sur la figure 2, la pierre 20 de l'ensemble 10 est traversée par un trou 8 destiné à recevoir un pivot 17, également appelé tourillon. La pierre 20 comporte, une face supérieure 5 et une face inférieure 6 dont l'une comprend un cône 12 communiquant avec le trou traversant 8. Autrement dit, le trou 8 communique avec la face supérieure 5 et avec aussi un évidement sensiblement conique défini dans la face inférieure 6. Cet évidement forme alors un cône d'engagement de la pierre percée 20. Le cône 12 présente de préférence une symétrie de rotation. Le cône 12 a une première ouverture 19 à sa base et une deuxième ouverture à son sommet. La première ouverture 19 est plus grande que la deuxième, et est formée dans la face inférieure 6 de la pierre 20. La liaison du cône 12 et du trou 8 s'effectue par la deuxième ouverture pour former une arête 15.On the figure 2 , the stone 20 of the assembly 10 is traversed by a hole 8 intended to receive a pivot 17, also called pin. The stone 20 comprises an upper face 5 and a lower face 6, one of which comprises a cone 12 communicating with the through hole 8. In other words, the hole 8 communicates with the upper face 5 and also with a substantially conical recess defined in the underside 6. This recess then forms an engagement cone for the pierced stone 20. The cone 12 preferably has rotational symmetry. Cone 12 has a first opening 19 at its base and a second opening at its top. The first opening 19 is larger than the second, and is formed in the lower face 6 of the stone 20. The connection of the cone 12 and the hole 8 is carried out by the second opening to form an edge 15.

Ainsi, l'évasement du cône 12 permet d'insérer facilement le pivot 17 de l'arbre 16 d'une pièce mobile en rotation, notamment en cas de choc. L'angle du cône est choisi pour éviter que l'arête 15 formée par le haut du cône et le trou 8 ne soit trop saillante. On choisit par exemple un angle compris entre 30° et 120°, de préférence compris entre 45° et 90°.Thus, the widening of the cone 12 makes it possible to easily insert the pivot 17 of the shaft 16 of a rotating part, in particular in the event of an impact. The angle of the cone is chosen to prevent the edge 15 formed by the top of the cone and the hole 8 from projecting too much. For example, an angle of between 30° and 120°, preferably between 45° and 90°, is chosen.

On remarque également qu'une paroi interne du corps de cette pierre 20 définie au niveau du trou 8 comporte une zone arrondie destinée à minimiser le contact avec le pivot mais également à faciliter une éventuelle lubrification.It is also noted that an internal wall of the body of this stone 20 defined at the level of the hole 8 comprises a rounded zone intended to minimize contact with the pivot but also to facilitate possible lubrication.

La face supérieure 5 de la pierre comprend un rebord 18, notamment pour enserrer latéralement un contre-pivot dans le cas d'un palier. Le rebord 18 est de préférence périphérique, c'est-à-dire qu'il délimite le bord de la face supérieure 5 de la pierre 20. De plus, il définit une zone interne 9 de la face supérieure 5 comportant une face d'appui 11 et la sortie du trou débouchant 8, et une zone 9 convexe concentriquement depuis la face d'appui 11 jusqu'au trou 8.The upper face 5 of the stone comprises a rim 18, in particular to enclose laterally a counter-pivot in the case of a landing. The rim 18 is preferably peripheral, that is to say it delimits the edge of the upper face 5 of the stone 20. In addition, it defines an internal zone 9 of the upper face 5 comprising a face of support 11 and the outlet of the through hole 8, and a concentrically convex zone 9 from the support face 11 to the hole 8.

Une face supérieure 5 avec un tel rebord 18 permet, par exemple, de bloquer latéralement un élément agencé sur la face supérieure de la pierre 20. Dans le cas d'un palier pour un axe balancier, dans lequel la pierre 20 sert d'élément de guidage, on peut disposer une pierre contre-pivot de telle sorte qu'elle soit bloquée latéralement par le côté interne du rebord 18 tout en reposant sur la face d'appui 11. La pierre contre-pivot est dimensionnée pour correspondre à la zone 9 de la pierre 10. La pierre forme ainsi un support axial et radial d'un contre-pivot. Le contre-pivot, non représenté sur les figures peut être emboîté dans la pierre 10 pour le supporter axialement et le maintenir latéralement.An upper face 5 with such a rim 18 makes it possible, for example, to block laterally an element arranged on the upper face of the stone 20. In the case of a bearing for a balance axis, in which the stone 20 serves as an element guide, a counter-pivot stone can be arranged so that it is blocked laterally by the internal side of the rim 18 while resting on the bearing face 11. The counter-pivot stone is sized to correspond to the zone 9 of stone 10. The stone thus forms an axial and radial support for a counter-pivot. The counter-pivot, not shown in the figures, can be fitted into stone 10 to support it axially and hold it laterally.

En outre, la pierre 10 a une face périphérique 13 en partie évasée reliant la face inférieure 6 de plus petite surface à la face supérieure 5 de plus grande surface.In addition, the stone 10 has a partially flared peripheral face 13 connecting the lower face 6 of smaller surface to the upper face 5 of larger surface.

La figure 3 montre une variante de réalisation d'une pierre 30 d'un ensemble. La pierre 30 a une forme différente, la face supérieure 25 étant bombée et la face inférieure 26 étant sensiblement plane. Cette pierre 30 ne comprend pas de rebord, et doit être insérée dans une bague (ou chaton) spécifique. Le trou traversant 28 et le cône 22 sont semblables à ceux de la figure 2.The picture 3 shows an alternative embodiment of a stone 30 of a set. The stone 30 has a different shape, the upper face 25 being curved and the lower face 26 being substantially planar. This stone 30 does not include an edge, and must be inserted into a specific ring (or bezel). The through hole 28 and the cone 22 are similar to those of the figure 2 .

Selon l'invention, le mobile tournant est muni d'un pivot comportant au moins en partie un matériau amagnétique, de préférence en totalité. Le matériau amagnétique permet de limiter la sensibilité du pivot aux champs magnétiques. Le matériau amagnétique du pivot comprend un alliage métallique à choisir parmi des matériaux à base de cuivre, à base de palladium, ou des matériaux à base d'aluminium. Le matériau amagnétique compris dans le pivot est mou, c'est-à-dire qu'il a une dureté de Vickers inférieure à 500 HV, de préférence inférieure à 450 HV, voire inférieure à 400 HV ou 350HV. Ainsi, le matériau amagnétique est un matériau « mou » par rapport aux matériaux métalliques plus durs utilisés pour former des pivots de mobiles tournants usuels.According to the invention, the rotating mobile is provided with a pivot comprising at least partly a non-magnetic material, preferably entirely. The non-magnetic material makes it possible to limit the sensitivity of the pivot to magnetic fields. The non-magnetic material of the pivot comprises a metal alloy to be chosen from materials based on copper, based on palladium, or materials based on aluminium. The non-magnetic material included in the pivot is soft, that is to say it has a Vickers hardness of less than 500 HV, preferably less than 450 HV, or even less than 400 HV or 350HV. Thus, the non-magnetic material is a “soft” material compared to the harder metallic materials used to form the pivots of the usual rotary mobiles.

Dans un premier mode de réalisation, le matériau amagnétique comprend un alliage de cuivre et de béryllium, de type CuBe2. De préférence, le pivot est formé sensiblement en totalité de cet alliage de cuivre et de béryllium. L'alliage comprend généralement au moins 90% de cuivre, voire au moins 95% de Cuivre, et même jusqu'à 98% de Cuivre, qui est complété par du Béryllium.In a first embodiment, the non-magnetic material comprises an alloy of copper and beryllium, of the CuBe2 type. Preferably, the pivot is formed substantially entirely from this alloy of copper and beryllium. The alloy generally comprises at least 90% copper, even at least 95% copper, and even up to 98% copper, which is supplemented by beryllium.

Dans un second mode de réalisation, le matériau amagnétique est un alliage comprenant en poids :

  • entre 25% et 55% de palladium,
  • entre 25% et 55% d'argent,
  • entre 10% et 30% de cuivre,
  • entre 0.5% et 5% de zinc,
  • de l'or et du platine avec un pourcentage total de ces deux éléments compris entre 15% et 25%,
  • entre 0% et 1% d'un ou plusieurs éléments choisis parmi bore et nickel,
  • entre 0% et 3% d'un ou plusieurs éléments choisis parmi le rhénium et le ruthénium
  • au maximum 0,1% d'un ou plusieurs éléments choisis parmi l'iridium, l'osmium, et le rhodium et
  • au maximum 0,2% d'autres impuretés les quantités respectives des composants étant telles qu'additionnées entre elles, elles ne dépassent pas les 100%.
In a second embodiment, the non-magnetic material is an alloy comprising by weight:
  • between 25% and 55% palladium,
  • between 25% and 55% silver,
  • between 10% and 30% copper,
  • between 0.5% and 5% zinc,
  • gold and platinum with a total percentage of these two elements between 15% and 25%,
  • between 0% and 1% of one or more elements chosen from boron and nickel,
  • between 0% and 3% of one or more elements chosen from rhenium and ruthenium
  • a maximum of 0.1% of one or more elements chosen from iridium, osmium and rhodium and
  • a maximum of 0.2% of other impurities, the respective quantities of the components being such that when added together, they do not exceed 100%.

Avantageusement, le matériau amagnétique est un alliage comprenant en poids :

  • entre 30% et 40% de palladium,
  • entre 25% et 35% d'argent,
  • entre 10% et 18% de cuivre,
  • entre 0.5% et 1.5% de zinc,
  • entre 8 et 12% d'or et 8 et 12% de platine avec une proportion de rhénium et ruthénium comprise entre 0 et 6% en poids.
Advantageously, the non-magnetic material is an alloy comprising by weight:
  • between 30% and 40% palladium,
  • between 25% and 35% silver,
  • between 10% and 18% copper,
  • between 0.5% and 1.5% zinc,
  • between 8 and 12% gold and 8 and 12% platinum with a proportion of rhenium and ruthenium between 0 and 6% by weight.

Selon une variante préférée, le matériau amagnétique est un alliage comprenant en poids:

  • entre 34% et 36% de palladium,
  • entre 29% et 31 % d'argent,
  • entre 13,5% et 14,5% de cuivre,
  • entre 0.8% et 1,2% de zinc,
  • entre 9,5% et 10,5% d'or
  • entre 9,5% et 10,5% de platine,
  • au maximum 0,1% d'un ou plusieurs éléments choisis parmi l'iridium, l'osmium, le rhodium et le ruthénium et
  • au maximum 0,2% d'autres impuretés, les quantités respectives des composants étant telles qu'additionnées entre elles, atteignent 100%.
According to a preferred variant, the non-magnetic material is an alloy comprising by weight:
  • between 34% and 36% palladium,
  • between 29% and 31% silver,
  • between 13.5% and 14.5% copper,
  • between 0.8% and 1.2% zinc,
  • between 9.5% and 10.5% gold
  • between 9.5% and 10.5% platinum,
  • a maximum of 0.1% of one or more elements chosen from iridium, osmium, rhodium and ruthenium and
  • not more than 0.2% of other impurities, the respective amounts of the components being as added together, reach 100%.

Selon une variante encore plus préférée, le matériau amagnétique est un alliage constitué en poids de 35 % de palladium, 30% d'argent, 14% de cuivre, 10% d'or, 10% de platine et 1% de zinc.According to an even more preferred variant, the non-magnetic material is an alloy made up by weight of 35% palladium, 30% silver, 14% copper, 10% gold, 10% platinum and 1% zinc.

Dans le troisième mode de réalisation, le matériau amagnétique est un alliage comprenant en poids :

  • entre 25% et 55% de palladium,
  • entre 25% et 55% d'argent,
  • entre 10% et 30% de cuivre,
  • entre 0% et 5% de zinc,
  • entre 0% et 2% d'un ou plusieurs éléments choisis parmi rhénium, ruthénium, or et platine,
  • entre 0% et 1 % d'un ou plusieurs éléments choisis parmi bore et nickel.
In the third embodiment, the non-magnetic material is an alloy comprising by weight:
  • between 25% and 55% palladium,
  • between 25% and 55% silver,
  • between 10% and 30% copper,
  • between 0% and 5% zinc,
  • between 0% and 2% of one or more elements chosen from rhenium, ruthenium, gold and platinum,
  • between 0% and 1% of one or more elements chosen from boron and nickel.

De préférence, le matériau amagnétique est un alliage comprenant en poids :

  • entre 38% et 43% de palladium ; et/ou
  • entre 35% et 40% d'argent ; et/ou
  • entre 18% et 23% de cuivre ; et/ou
  • entre 0.5% et 1.5% de zinc.
Preferably, the non-magnetic material is an alloy comprising by weight:
  • between 38% and 43% palladium; and or
  • between 35% and 40% silver; and or
  • between 18% and 23% copper; and or
  • between 0.5% and 1.5% zinc.

Plus particulièrement encore, le matériau amagnétique est un alliage comprenant 41 % de palladium, 37.5% d'argent, 20% de cuivre, 1 % de zinc et 0.5% de platine.More particularly still, the non-magnetic material is an alloy comprising 41% palladium, 37.5% silver, 20% copper, 1% zinc and 0.5% platinum.

Dans un quatrième mode de réalisation de l'invention à base d'aluminium, le matériau amagnétique est un alliage comprenant en poids :

  • entre 83% et 94.5% d'aluminium,
  • entre 4% et 7% de zinc,
  • entre 1% et 4% de magnésium,
  • entre 0.5% et 3% de cuivre,
  • entre 0% et 3% d'un ou plusieurs éléments choisis parmi le chrome, le silicium, le manganèse, le titane et le fer.
In a fourth embodiment of the invention based on aluminium, the non-magnetic material is an alloy comprising by weight:
  • between 83% and 94.5% aluminum,
  • between 4% and 7% zinc,
  • between 1% and 4% magnesium,
  • between 0.5% and 3% copper,
  • between 0% and 3% of one or more elements chosen from chromium, silicon, manganese, titanium and iron.

De préférence, on utilise un alliage connu sous le nom d'alliage d'aluminium de type « 7075 » (zicral), qui comprend plus précisément en poids :

  • entre 87.32% et 91.42% d'aluminium,
  • entre 5.1% et 6.1% de zinc,
  • entre 2.1% et 2.9% de magnésium,
  • entre 1.2% et 2% de cuivre,
  • entre 0.18% et 0.28% de chrome,
  • entre 0% et 0.4% de silicium,
  • entre 0% et 0.3% de manganèse,
  • entre 0% et 0.2% de titane, et
  • entre 0% et 0.5% de fer.
Preferably, an alloy known as aluminum alloy type "7075" (zicral) is used, which comprises more precisely by weight:
  • between 87.32% and 91.42% aluminum,
  • between 5.1% and 6.1% zinc,
  • between 2.1% and 2.9% magnesium,
  • between 1.2% and 2% copper,
  • between 0.18% and 0.28% chromium,
  • between 0% and 0.4% silicon,
  • between 0% and 0.3% manganese,
  • between 0% and 0.2% titanium, and
  • between 0% and 0.5% iron.

Bien entendu, la présente invention ne se limite pas aux exemples illustrés mais est susceptible de diverses variantes et modifications qui apparaîtront à l'homme de l'art. On connait par exemple d'autres matériaux comme le laiton, le maillechort, le declafor, voire même des aciers amagnétiques mous.Of course, the present invention is not limited to the examples illustrated but is susceptible to various variants and modifications which will appear to those skilled in the art. We know, for example, of other materials such as brass, nickel silver, declafor, and even soft non-magnetic steels.

Claims (14)

Ensemble (10), notamment pour une pièce d'horlogerie, comprenant un mobile tournant et un coussinet, telle une pierre (20, 30), le mobile tournant étant muni d'au moins un pivot (17) comportant au moins en partie un matériau amagnétique, de préférence en totalité, le coussinet comportant une face (6, 26) pourvue d'un trou (8, 28) formé dans le corps du coussinet et d'une géométrie fonctionnelle à l'entrée du trou (8, 28), caractérisée en ce que la géométrie fonctionnelle a une forme de cône (12, 22), et en ce que le matériau amagnétique du pivot (17) comprend un alliage à choisir parmi des matériaux à base de cuivre, des matériaux à base de palladium, ou des matériaux à base d'aluminium.Assembly (10), in particular for a timepiece, comprising a rotating wheel set and a bearing, such as a stone (20, 30), the rotating wheel set being provided with at least one pivot (17) comprising at least in part a non-magnetic material, preferably entirely, the bearing having a face (6, 26) provided with a hole (8, 28) formed in the body of the bearing and with a functional geometry at the entrance to the hole (8, 28 ), characterized in that the functional geometry has the shape of a cone (12, 22), and in that the non-magnetic material of the pivot (17) comprises an alloy to be chosen from materials based on copper, materials based on palladium, or aluminum-based materials. Ensemble, selon la revendication 1, caractérisé en ce que le matériau amagnétique a une dureté de Vickers inférieure à 500HV, de préférence inférieure à 450 HV, voire inférieure à 400 HV.Assembly, according to Claim 1, characterized in that the non-magnetic material has a Vickers hardness of less than 500 HV, preferably less than 450 HV, or even less than 400 HV. Ensemble, selon la revendication 1 ou 2, caractérisé en ce que le matériau amagnétique est un alliage à base de cuivre de type CuBe2.Assembly, according to claim 1 or 2, characterized in that the non-magnetic material is a copper-based alloy of the CuBe2 type. Ensemble, selon la revendication 1ou 2, caractérisé en ce que le matériau amagnétique est un alliage à base de palladium comprenant en poids : - entre 25% et 55% de palladium, - entre 25% et 55% d'argent, - entre 10% et 30% de cuivre, - entre 0.5% et 5% de zinc, - de l'or et du platine avec un pourcentage total de ces deux éléments compris entre 5% et 25%, - entre 0% et 1% d'un ou plusieurs éléments choisis parmi bore et nickel, - entre 0% et 3% d'un ou plusieurs éléments choisis parmi le rhénium et le ruthénium - au maximum 0,1% d'un ou plusieurs éléments choisis parmi l'iridium, l'osmium, et le rhodium et - au maximum 0,2% d'autres impuretés, les quantités respectives des composants étant telles qu'additionnées entre elles, atteignent 100%. Assembly, according to claim 1 or 2, characterized in that the non-magnetic material is a palladium-based alloy comprising by weight: - between 25% and 55% palladium, - between 25% and 55% silver, - between 10% and 30% copper, - between 0.5% and 5% zinc, - gold and platinum with a total percentage of these two elements between 5% and 25%, - between 0% and 1% of one or more elements chosen from boron and nickel, - between 0% and 3% of one or more elements chosen from rhenium and ruthenium - at most 0.1% of one or more elements chosen from iridium, osmium, and rhodium and - at most 0.2% of other impurities, the respective amounts of the components being as added together, reach 100%. Ensemble, selon la revendication 4, caractérisé en ce que le matériau amagnétique est un alliage comprenant en poids : entre 30% et 40% de palladium, entre 25% et 35% d'argent, entre 10% et 18% de cuivre, entre 0.5% et 1.5% de zinc, et l'alliage comprend en poids de l'or et du platine avec un pourcentage total de ces deux éléments compris entre 16% et 24%.Assembly, according to claim 4, characterized in that the non-magnetic material is an alloy comprising by weight: between 30% and 40% palladium, between 25% and 35% silver, between 10% and 18% copper, between 0.5% and 1.5% zinc, and the alloy comprises gold and platinum by weight with a total percentage of these two elements between 16% and 24%. Ensemble, selon la revendication 5, caractérisé en ce que le matériau amagnétique est un alliage comprenant en poids : - entre 34% et 36% de palladium, - entre 29% et 31% d'argent, - entre 13,5% et 14,5% de cuivre, - entre 0.8% et 1,2% de zinc, - entre 9,5% et 10,5% d'or - entre 9,5% et 10,5% de platine, - au maximum 0,1% d'un ou plusieurs éléments choisis parmi l'iridium, l'osmium, le rhodium et le ruthénium et - au maximum 0,2% d'autres impuretés les quantités respectives des composants étant telles qu'additionnées entre elles, atteignent 100%. Assembly, according to claim 5, characterized in that the non-magnetic material is an alloy comprising by weight: - between 34% and 36% palladium, - between 29% and 31% silver, - between 13.5% and 14.5% copper, - between 0.8% and 1.2% zinc, - between 9.5% and 10.5% gold - between 9.5% and 10.5% platinum, - a maximum of 0.1% of one or more elements chosen from iridium, osmium, rhodium and ruthenium and - at most 0.2% of other impurities, the respective amounts of the components being as added together, reach 100%. Ensemble, selon la revendication 1 ou 2, caractérisé en ce que le matériau amagnétique est un alliage à base de palladium comprenant en poids : - entre 25% et 55% de palladium - entre 25% et 55% d'argent, - entre 10% et 30% de cuivre, - entre 0% et 5% de zinc, - entre 0% et 2% d'un ou plusieurs éléments choisis parmi rhénium, ruthénium, or et platine, - entre 0% et 1 % d'un ou plusieurs éléments choisis parmi le bore et le nickel. Assembly, according to claim 1 or 2, characterized in that the non-magnetic material is a palladium-based alloy comprising by weight: - between 25% and 55% palladium - between 25% and 55% silver, - between 10% and 30% copper, - between 0% and 5% zinc, - between 0% and 2% of one or more elements chosen from rhenium, ruthenium, gold and platinum, - between 0% and 1% of one or more elements chosen from boron and nickel. Ensemble, selon la revendication 7, caractérisé en ce que le matériau amagnétique est un alliage comprenant en poids entre 38% et 43% de palladium, entre 35% et 40% d'argent, entre 18% et 23% de cuivre, et entre 0.5% et 1.5% de zinc.Assembly, according to claim 7, characterized in that the non-magnetic material is an alloy comprising by weight between 38% and 43% palladium, between 35% and 40% silver, between 18% and 23% copper, and between 0.5% and 1.5% zinc. Ensemble, selon la revendication 1 ou 2, caractérisé en ce que le matériau amagnétique est un alliage à base d'aluminium comprenant en poids : - entre 83% et 94.5% d'aluminium, - entre 4% et 7% de zinc, - entre 1% et 4% de magnésium, - entre 0.5% et 3% de cuivre, - entre 0% et 3% d'un ou plusieurs éléments choisis parmi le chrome, le silicium, le manganèse, le titane et le fer. Assembly, according to claim 1 or 2, characterized in that the non-magnetic material is an aluminum-based alloy comprising by weight: - between 83% and 94.5% aluminum, - between 4% and 7% zinc, - between 1% and 4% magnesium, - between 0.5% and 3% copper, - between 0% and 3% of one or more elements chosen from chromium, silicon, manganese, titanium and iron. Ensemble, selon la revendication 9, caractérisé en ce que le matériau amagnétique est un alliage comprenant en poids : - entre 87.32% et 91.42% d'aluminium, - entre 5.1% et 6.1% de zinc, - entre 2.1% et 2.9% de magnésium, - entre 1.2% et 2% de cuivre, - entre 0.18% et 0.28% de chrome, - entre 0% et 0.4% de silicium, - entre 0% et 0.3% de manganèse, - entre 0% et 0.2% de titane, et - entre 0% et 0.5% de fer. Assembly, according to claim 9, characterized in that the non-magnetic material is an alloy comprising by weight: - between 87.32% and 91.42% aluminium, - between 5.1% and 6.1% of zinc, - between 2.1% and 2.9% magnesium, - between 1.2% and 2% copper, - between 0.18% and 0.28% chromium, - between 0% and 0.4% silicon, - between 0% and 0.3% manganese, - between 0% and 0.2% titanium, and - between 0% and 0.5% iron. Ensemble, selon l'une, quelconque, des revendications précédentes, caractérisé en ce que la pierre (20, 30) comprend de l'alumine Al2O3 ou de la zircone ZrO2.Assembly according to any one of the preceding claims, characterized in that the stone (20, 30) comprises alumina Al2O3 or zirconia ZrO2. Ensemble, selon l'une, quelconque, des revendications précédentes, caractérisé en ce que la pierre (20, 30) comprend une face supérieure (5, 25) et une face inférieure (6, 26), la face inférieure (6, 26) comportant le cône (12, 22).Assembly according to any one of the preceding claims, characterized in that the stone (20, 30) comprises an upper face (5, 25) and a lower face (6, 26), the lower face (6, 26 ) comprising the cone (12, 22). Ensemble, selon l'une, quelconque, des revendications précédentes, caractérisé en ce que le trou (8, 28) est traversant, de manière à relier ledit cône (12, 22) à la face supérieure (5, 25) de ladite pierre (20, 30).Assembly according to any one of the preceding claims, characterized in that the hole (8, 28) passes through, so as to connect the said cone (12, 22) to the upper face (5, 25) of the said stone. (20, 30). Pièce d'horlogerie comprenant un ensemble (10) selon l'une, quelconque, des revendications précédentes.Timepiece comprising an assembly (10) according to any one of the preceding claims.
EP21152892.2A 2021-01-22 2021-01-22 Assembly comprising a rotating moving part made of non-magnetic material and a bearing provided with a cone Pending EP4033307A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP21152892.2A EP4033307A1 (en) 2021-01-22 2021-01-22 Assembly comprising a rotating moving part made of non-magnetic material and a bearing provided with a cone
US17/646,317 US20220235438A1 (en) 2021-01-22 2021-12-29 Assembly comprising a rotary wheel made of a non-magnetic material and a bearing provided with a cone
JP2022001390A JP2022113124A (en) 2021-01-22 2022-01-07 Rotary wheel made of non-magnetic material and assembly equipped with bearing having partial conical surface
KR1020220006057A KR20220106692A (en) 2021-01-22 2022-01-14 Assembly comprising a rotary wheel made of a non-magnetic material and a bearing provided with a cone
CN202210066173.8A CN114815566A (en) 2021-01-22 2022-01-20 Assembly comprising a rotating wheel made of non-magnetic material and a bearing provided with a conical portion
JP2023137273A JP2023153390A (en) 2021-01-22 2023-08-25 Assembly comprising rotary wheel made of non-magnetic material and bearing provided with partly conical surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21152892.2A EP4033307A1 (en) 2021-01-22 2021-01-22 Assembly comprising a rotating moving part made of non-magnetic material and a bearing provided with a cone

Publications (1)

Publication Number Publication Date
EP4033307A1 true EP4033307A1 (en) 2022-07-27

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EP21152892.2A Pending EP4033307A1 (en) 2021-01-22 2021-01-22 Assembly comprising a rotating moving part made of non-magnetic material and a bearing provided with a cone

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US (1) US20220235438A1 (en)
EP (1) EP4033307A1 (en)
JP (2) JP2022113124A (en)
KR (1) KR20220106692A (en)
CN (1) CN114815566A (en)

Citations (8)

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Publication number Priority date Publication date Assignee Title
GB655161A (en) * 1946-10-19 1951-07-11 Linde Air Prod Co Improvements in the pivotal mountings of machine or instrument parts
GB867211A (en) * 1957-04-30 1961-05-03 Straumann Inst Ag Parts of clock and watch movements
FR1314364A (en) * 1960-06-15 1963-01-11 New combination of magnets for axle suspension together with the maintenance of an electric clockwork movement
CH712762A2 (en) * 2016-07-19 2018-01-31 Nivarox Far Sa Pivot axis for watch movement.
CH714370A2 (en) * 2017-11-27 2019-05-31 Montres Breguet Sa Device for magnetic centering of a shaft in a watch movement.
WO2019145434A1 (en) * 2018-01-26 2019-08-01 Richemont International Sa Pivoting pin of a regulator
EP3594756A1 (en) * 2018-07-10 2020-01-15 Blancpain SA Timepiece component with arboured portion made of non-magnetic alloy
CH715679A2 (en) * 2018-12-20 2020-06-30 Swatch Group Res & Dev Ltd Landing, in particular shock absorber, and mobile rotating with a watch movement.

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
EP3273306A1 (en) * 2016-07-19 2018-01-24 Nivarox-FAR S.A. Part for clock movement
EP3273307A1 (en) * 2016-07-19 2018-01-24 Nivarox-FAR S.A. Part for clock movement
EP3483665A1 (en) * 2017-11-13 2019-05-15 Comadur S.A. Method for manufacturing a pierced jewel

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB655161A (en) * 1946-10-19 1951-07-11 Linde Air Prod Co Improvements in the pivotal mountings of machine or instrument parts
GB867211A (en) * 1957-04-30 1961-05-03 Straumann Inst Ag Parts of clock and watch movements
FR1314364A (en) * 1960-06-15 1963-01-11 New combination of magnets for axle suspension together with the maintenance of an electric clockwork movement
CH712762A2 (en) * 2016-07-19 2018-01-31 Nivarox Far Sa Pivot axis for watch movement.
CH714370A2 (en) * 2017-11-27 2019-05-31 Montres Breguet Sa Device for magnetic centering of a shaft in a watch movement.
WO2019145434A1 (en) * 2018-01-26 2019-08-01 Richemont International Sa Pivoting pin of a regulator
EP3594756A1 (en) * 2018-07-10 2020-01-15 Blancpain SA Timepiece component with arboured portion made of non-magnetic alloy
CH715679A2 (en) * 2018-12-20 2020-06-30 Swatch Group Res & Dev Ltd Landing, in particular shock absorber, and mobile rotating with a watch movement.

Also Published As

Publication number Publication date
JP2022113124A (en) 2022-08-03
CN114815566A (en) 2022-07-29
JP2023153390A (en) 2023-10-17
KR20220106692A (en) 2022-07-29
US20220235438A1 (en) 2022-07-28

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