EP2631721A1 - Uhrkomponenten aus diamantverkleidetem Titan - Google Patents

Uhrkomponenten aus diamantverkleidetem Titan Download PDF

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Publication number
EP2631721A1
EP2631721A1 EP12156752.3A EP12156752A EP2631721A1 EP 2631721 A1 EP2631721 A1 EP 2631721A1 EP 12156752 A EP12156752 A EP 12156752A EP 2631721 A1 EP2631721 A1 EP 2631721A1
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EP
European Patent Office
Prior art keywords
component
mobile
diamond layer
component according
titanium
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.)
Withdrawn
Application number
EP12156752.3A
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English (en)
French (fr)
Inventor
Eric Klein
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.)
Richemont International SA
Original Assignee
Richemont International SA
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 Richemont International SA filed Critical Richemont International SA
Priority to EP12156752.3A priority Critical patent/EP2631721A1/de
Publication of EP2631721A1 publication Critical patent/EP2631721A1/de
Withdrawn legal-status Critical Current

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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
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/021—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft
    • G04B13/022—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft with parts made of hard material, e.g. silicon, diamond, sapphire, quartz and the like
    • 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
    • G04B15/00—Escapements
    • G04B15/14—Component parts or constructional details, e.g. construction of the lever or the escape wheel
    • 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
    • G04B29/00—Frameworks
    • G04B29/02—Plates; Bridges; Cocks
    • G04B29/027—Materials and manufacturing
    • 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
    • G04B31/012—Metallic bearings

Definitions

  • the present invention relates to a watch component undergoing friction, having a low moment of inertia and good tribological properties.
  • the present invention relates in particular to a watchmaker mobile intended to be pivotally mounted on a shaft, or a stationary watch component for supporting said mobile.
  • silicon is increasingly used because of its insensitivity to magnetic fields, its very low coefficient of thermal expansion, and its density much lower than that of metals or alloys.
  • modern machining technologies enable complex shapes to be produced with great precision.
  • micromechanical silicon parts In practice, it has been demonstrated that the performance of such micromechanical silicon parts in terms of their mechanical properties and abrasive wear was not satisfactory.
  • these silicon parts are often coated with a coating having a low roughness and good tribological properties, such as a metal coating or amorphous carbon (DLC).
  • a coating having a low roughness and good tribological properties such as a metal coating or amorphous carbon (DLC).
  • the present invention relates to a watch component undergoing friction characterized in that at least a portion of the mobile is made of titanium, and in that said titanium portion of the mobile is at least partially coated with a diamond layer.
  • Said component may be all or part of a watchmaking frame, able to support the pivots of a watchmaker.
  • the component may be a mobile for a watch movement intended to be pivotally mounted on a shaft.
  • Said mobile can be included in an exhaust system of the watch movement and can be at least one of the following mobiles: an escape wheel, an anchor, and a tray.
  • At least one portion of the mobile may comprise at least one of the following portions: anchor arms, anchor lifts, an exhaust wheel hub, and a small plate and an ankle of the plateau.
  • said at least one portion of the mobile may comprise a portion of the mobile which is chased on the shaft, such as the arms, the small plate and a large plateau of the plate, and a hub of the wheel exhaust.
  • the portion of the mobile coated with the diamond layer may comprise at least one of the following portions: the forks, lifts, teeth of the escape wheel, the small plate and the ankle of the plateau.
  • the diamond layer may have a coefficient of friction of less than 0.1, and preferably less than 0.03.
  • the diamond layer may also be crystalline and include a grain size of less than 10 nm.
  • the diamond layer may also have a thickness of between 2 ⁇ m and 10 ⁇ m.
  • the proportion of carbon having sp 2 hybridization to carbon having sp 3 hybridization may be higher near the outer surface of the diamond layer than in the remainder of the diamond layer.
  • said at least a portion of the mobile can be made by a stamping method.
  • the present invention also relates to an exhaust system comprising the mobile of the invention, as well as a watch movement comprising at least one component according to the invention.
  • the component has a low moment of inertia, good tribological properties, and has a plastic field allowing deformation sufficient for hunting.
  • a mobile the latter can be easily hunted on his tree.
  • a fixed element such as a platinum or a bridge, it is possible to switch from stone for mounting the pivots of the mobile.
  • the exhaust system 1 comprises in particular an escape wheel 3, comprising an escape wheel secured to an exhaust pinion, pivotally mounted on an axle 30, an anchor 2 pivotally mounted on an anchor rod 23, and a plate 4 driven on a balance shaft 40.
  • the plate 4 comprises a small plate 41 provided with a notch 42 and a large plate 43 provided with an ankle (not shown in FIG. figure 1 ).
  • the anchor 2 comprises arms 21 comprising lifts 22 cooperating with teeth 31 of the escape wheel 3.
  • the rod 20 comprises a stinger 24 and a fork 25.
  • the stinger 24 is intended to cooperate with the small plate 41 to prevent accidental movement of the fork 25.
  • the fork 25 is preferably mounted above the stinger 24 and comprises two horns 26 intended to come into contact with the large plate pin 43, according to the rotation of the pin, to cause the anchor 2 to pivot about its rod 23 in a reciprocating motion.
  • the exhaust systems are difficult to develop because they are the compromise between the lowest possible inertia and the best possible tribological properties, in particular, the lifts 22 and the fork 25. Thus, it is difficult to avoid the collars between the plateau pin and the horns 26 of the fork 25 while preserving minimal inertia and even insensitivity to magnetic fields.
  • the mobiles of the exhaust system 1, that is to say the mobile escape 3, the anchor 2, and the plate 4 are made of titanium.
  • titanium includes both pure titanium and the various grades of titanium (for example titanium grade 1 to 4) and other titanium alloys (for example titanium grade 5 or other titanium alloys) .
  • the choice of titanium among other light metals, for this particular application has a set of technical advantages.
  • the use of titanium with a density around 4.5 g / cm 3 significantly reduces the mass of components compared to traditional components. It is therefore possible to significantly reduce the moment of inertia of the moving components. This reduction in inertia makes it possible to reduce the energy required for moving mobile components, such as the escapement mobile 3.
  • the titanium components have superior mechanical properties, such as high mechanical strength and low coefficient of thermal expansion.
  • the components are also non-magnetic in nature and have, in addition, excellent resistance to corrosion.
  • the titanium mobile can be hunted directly on a tree.
  • the term tree takes the known horological definition, for example as given in: " G.-A. Berner, Professional Illustrated Dictionary of Watchmaking, Ed. Federation Horlogère Suisse, 2007 ", and includes any cylindrical body (shaft, shaft, rod) of various shapes on which is fixed or rotates the mobile Unlike the silicon, the mobile titanium is not likely to break because the titanium has a plastic domain allowing deformation is sufficient for driving the hunting of the mobile titanium also requires no bonding operation and / or the use of an intermediate piece of elastically deformable material.It is also possible to calculate the tolerances required for 'Shaft and bore so as to have a tight fit without risk of breaking the workpiece, or deforming it.
  • the titanium mobiles are at least partially coated with a diamond layer in order to modify the tribology and / or the mechanical characteristics of the components.
  • the diamond layer can be deposited by a chemical vapor deposition (CVD) method in a reactor. Titanium has the advantage of being resistant to the temperatures typically reached during the deposition of the diamond layer which takes place at a temperature around 800 ° C.
  • the deposition can be carried out in the presence of a gas such as hydrogen or argon so as to obtain a pure diamond deposit.
  • Diamond deposition can also be doped by incorporation of boron, phosphorus, or metal atoms, thereby increasing the conductivity of the diamond layer. The layer thus doped will be less likely to attract particles such as dust and / or debris.
  • the diamond layer can also be doped with other elements such as sulfide, aluminum, nitrogen, or a combination of these elements.
  • the surface of the diamond layer may be rendered hydrophobic, for example, by a fluorination treatment, a chemical or plasma treatment, or another technique.
  • the diamond layer is nanocrystalline, that is to say that the size of the crystalline grains is typically less than 10 nm.
  • a small grain size reduces the surface roughness of the diamond layer.
  • Such layers may have a coefficient of friction that is less than 0.1, or even less than 0.03.
  • the diamond layer may have a thickness of preferably between 2 ⁇ m and 10 ⁇ m in order to ensure a high hardness and a low coefficient of friction of the layer.
  • the coefficient of friction of the diamond layer can be further decreased by increasing the proportion of carbon having sp 2 hybridization with sp 3 hybridization in the vicinity of the outer surface of the diamond layer.
  • the surface of the diamond layer has a higher proportion of carbon having sp 2 hybridization in the vicinity of the surface in contact with the other mobiles and components than in the rest of the diamond layer.
  • This hybridization variation can be obtained by controlling the concentration of carbon and / or methane towards the end of the deposition process, by the addition of nitrogen or argon, or by any other suitable method.
  • Such methods of deposition are described in patent applications EP2236455 and WO2010133607 .
  • All components / mobiles included in the exhaust system 1 may be made of titanium, or only a portion of these components / mobiles are made of titanium.
  • only the exhaust mobile 3 and the plate 4 can be made of titanium. It is also possible to make only a portion of the mobile titanium, while the other portion is in another material, such as steel, brass or nickel silver, or silicon.
  • the portion of the mobile being made of titanium is preferably a portion which is chased on a tree.
  • this portion may comprise the arms 21 of the anchor 2, the large and small plate 41, 42, and / or a hub 32 of the escape wheel 3.
  • the portion of the mobile made of titanium can be glued with the other portion or secured in any other way, before being coated with the diamond layer.
  • the entire surface of the mobile can be coated with the diamond layer (with the exception of the opening made in the component for the passage of the shaft). However, it may be considered to cover only a portion of the mobile.
  • the titanium portion of the mobile can be at least partially coated with the diamond layer.
  • the anchor 2 can be coated with the diamond layer only at the fork 25 and the lifts 22. In this configuration, the fork 25 and the lifts 22 have a low wear and a low coefficient of friction. association with the ankle.
  • the escape wheel 3 can be coated with the diamond layer at the teeth 31.
  • the plate 4 can be coated with diamond only at the level of the large plateau pin 43.
  • the portion of the titanium components / mobiles can advantageously be manufactured using a cutting method such as stamping.
  • a cutting method can offer a dimensional accuracy of the order of a micrometer with a relatively low cost of manufacture, allowing mass production.
  • the present invention is not limited to the embodiments that have just been described and that various modifications and simple variants can be envisaged by the skilled person without departing from the scope of the present invention.
  • any watch mobile intended to be pivotally mounted on a shaft.
  • Such mobiles may comprise, inter alia, gear trains and transmission, time setting mobiles, the return trains in the drive member, the balance of the regulating member, and the calendar mechanism.
  • diamond-coated titanium for the manufacture of other watch components, or else micromechanical components other than watch components, for example, micromechanical components having a functional role in a printed circuit or a MEMS.
  • the diamond coated titanium is used for the manufacture of fixed watch components that are subject to friction.
  • Such components may include the watch frame, for example, the deck and / or the decks, serving as a support for other movable members (not shown in FIG. figure 2 ) of the watch.
  • the figure 2 represents a bridge 50 of a watch.
  • the component 50 may be completely made of titanium, or only a portion of the component is made of titanium. In the latter case, at least a portion of the component undergoing friction is made of titanium. This portion will typically be the portion supporting the mobile, including the portion 52 of the component where is chased the pivot of the mobile.
  • the component 50 may be at least partially coated with a diamond layer in order to modify the tribology and / or the mechanical characteristics of the components.
  • the diamond layer can coat the portion supporting the mobile, in particular the portion 52 of the component where the pivot of the mobile is to be chased.
  • the wall of the bearing hole 51 may be coated with the diamond layer thus reducing the coefficient of friction on the wall of the holes and improving the friction torque between the bearing and the shaft of the mobile which can itself be coated with diamond. In this way, it is possible to pass ruby pad (or stone) in which are normally mounted pivots.
  • An advantage of the component 50 according to the invention is to allow the production of plates and bridges having very small thicknesses. It thus becomes possible to manufacture very thin watch cases. Another advantage is to be able to realize the component (frame, plate and / or bridge) in one piece with great precision while avoiding the disadvantages induced by mounting steps (stonework). The flatness and the precision of the component are improved despite its possible low thickness.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Micromachines (AREA)
EP12156752.3A 2012-02-23 2012-02-23 Uhrkomponenten aus diamantverkleidetem Titan Withdrawn EP2631721A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12156752.3A EP2631721A1 (de) 2012-02-23 2012-02-23 Uhrkomponenten aus diamantverkleidetem Titan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12156752.3A EP2631721A1 (de) 2012-02-23 2012-02-23 Uhrkomponenten aus diamantverkleidetem Titan

Publications (1)

Publication Number Publication Date
EP2631721A1 true EP2631721A1 (de) 2013-08-28

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EP12156752.3A Withdrawn EP2631721A1 (de) 2012-02-23 2012-02-23 Uhrkomponenten aus diamantverkleidetem Titan

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3002637A1 (de) 2014-09-29 2016-04-06 Richemont International S.A. Uhrensystem mit verbesserten tribologischen eigenschaften
WO2015189278A3 (fr) * 2014-06-11 2016-04-07 Cartier International Ag Oscillateur pour un ensemble de balancier-spiral d'une pièce d'horlogerie
EP3226080A1 (de) * 2016-03-30 2017-10-04 Officine Panerai AG Federhaussystem für uhr
US20190179264A1 (en) * 2017-12-13 2019-06-13 Rolex Sa Clock calendar mobile
EP4191345A1 (de) * 2021-12-06 2023-06-07 The Swatch Group Research and Development Ltd Funktionelle mikromechanikanordnung mit einer tribologischen beschichtung

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1447142A (fr) 1964-02-06 1966-07-29 Lip Sa Appareil pour le centrage, la mise plat et la fixation par collage du ressort-spirald'une montre sur sa virole
US3620005A (en) * 1967-10-04 1971-11-16 Messrs Gebruder Junghans Gmbh Ratchet wheel device for a balance wheel clock
US3906714A (en) 1973-06-20 1975-09-23 Tissot Horlogerie Watch escapement
US20050174893A1 (en) * 2004-02-05 2005-08-11 Montres Breguet Sa Balance for a clockwork movement
CH699680A2 (fr) 2008-10-03 2010-04-15 Richemont Int Sa Dispositif de fixation d'un mobile.
EP2236455A1 (de) 2009-04-02 2010-10-06 GFD Gesellschaft für Diamantprodukte mbH Mikromechanisches Bauteil mit reduziertem Verschleiss
WO2010133607A2 (en) 2009-05-18 2010-11-25 The Swatch Group Research And Development Ltd Method for coating micromechanical parts with high tribological performances for application in mechanical systems
EP2320280A1 (de) * 2009-11-06 2011-05-11 Nivarox-FAR S.A. Anker für Hemmungssystem eines Uhrwerks
CH702250A1 (fr) * 2009-11-20 2011-05-31 Cartier Creation Studio Sa Dispositif horloger anti-choc.

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1447142A (fr) 1964-02-06 1966-07-29 Lip Sa Appareil pour le centrage, la mise plat et la fixation par collage du ressort-spirald'une montre sur sa virole
US3620005A (en) * 1967-10-04 1971-11-16 Messrs Gebruder Junghans Gmbh Ratchet wheel device for a balance wheel clock
US3906714A (en) 1973-06-20 1975-09-23 Tissot Horlogerie Watch escapement
US20050174893A1 (en) * 2004-02-05 2005-08-11 Montres Breguet Sa Balance for a clockwork movement
CH699680A2 (fr) 2008-10-03 2010-04-15 Richemont Int Sa Dispositif de fixation d'un mobile.
EP2236455A1 (de) 2009-04-02 2010-10-06 GFD Gesellschaft für Diamantprodukte mbH Mikromechanisches Bauteil mit reduziertem Verschleiss
WO2010133607A2 (en) 2009-05-18 2010-11-25 The Swatch Group Research And Development Ltd Method for coating micromechanical parts with high tribological performances for application in mechanical systems
EP2320280A1 (de) * 2009-11-06 2011-05-11 Nivarox-FAR S.A. Anker für Hemmungssystem eines Uhrwerks
CH702250A1 (fr) * 2009-11-20 2011-05-31 Cartier Creation Studio Sa Dispositif horloger anti-choc.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
G.-A. BERNER: "Dictionnaire professionnel illustré de l'horlogerie", 2007, FÉDÉRATION HORLOGÈRE SUISSE

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015189278A3 (fr) * 2014-06-11 2016-04-07 Cartier International Ag Oscillateur pour un ensemble de balancier-spiral d'une pièce d'horlogerie
EP3002637A1 (de) 2014-09-29 2016-04-06 Richemont International S.A. Uhrensystem mit verbesserten tribologischen eigenschaften
EP3226080A1 (de) * 2016-03-30 2017-10-04 Officine Panerai AG Federhaussystem für uhr
US20190179264A1 (en) * 2017-12-13 2019-06-13 Rolex Sa Clock calendar mobile
EP3499317A1 (de) * 2017-12-13 2019-06-19 Rolex Sa Triebfeder eines kalender-uhrwerksmechanismus
CN109917632A (zh) * 2017-12-13 2019-06-21 劳力士有限公司 表日历移动件
EP4191345A1 (de) * 2021-12-06 2023-06-07 The Swatch Group Research and Development Ltd Funktionelle mikromechanikanordnung mit einer tribologischen beschichtung

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