EP2585876A1 - Ankersystem für uhren - Google Patents

Ankersystem für uhren

Info

Publication number
EP2585876A1
EP2585876A1 EP11726830.0A EP11726830A EP2585876A1 EP 2585876 A1 EP2585876 A1 EP 2585876A1 EP 11726830 A EP11726830 A EP 11726830A EP 2585876 A1 EP2585876 A1 EP 2585876A1
Authority
EP
European Patent Office
Prior art keywords
exhaust system
anchor
amorphous
alloy
escape wheel
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
EP11726830.0A
Other languages
English (en)
French (fr)
Other versions
EP2585876B1 (de
Inventor
Christian Charbon
Yves Winkler
Marco Verardo
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.)
Swatch Group Research and Development SA
Original Assignee
Swatch Group Research and Development 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=43242969&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2585876(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Swatch Group Research and Development SA filed Critical Swatch Group Research and Development SA
Priority to EP11726830.0A priority Critical patent/EP2585876B1/de
Publication of EP2585876A1 publication Critical patent/EP2585876A1/de
Application granted granted Critical
Publication of EP2585876B1 publication Critical patent/EP2585876B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • G04B15/00—Escapements
    • 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

Definitions

  • the present invention relates to an exhaust system.
  • This exhaust system comprises an anchor provided with a fork intended to cooperate with a pin mounted on a plate, and a rod comprising arms intended to receive pallets in order to cooperate with at least one escape wheel.
  • the technical field of the invention is the technical field of fine mechanics. and more particularly watchmaking
  • the timepieces include a power source such as the barrel providing energy to the room and in particular to the gear wheels. These wheels cooperate with the exhaust system via the escape wheel.
  • the rotation of the latter is regulated by the anchor of the exhaust system whose pulses are provided by the balance spring.
  • the exhaust system includes an anchor pivotally mounted on an axle.
  • This anchor comprises a rod provided with a fork, at a first end, intended to cooperate with a pin mounted on a plate, and provided with arms, at a second end, intended to receive pallets in order to cooperate with the wheel. exhaust.
  • the anchor pivots on its axis so that the paddles of the arms come into contact with the teeth of the escape wheel in order to regulate the rotation of the wheels.
  • the efficiency of the exhaust is relatively low.
  • the operation of the exhaust system comprises friction, shock and energy dissipation in the constituent materials of the wheel and the anchor in particular.
  • a material used is for example 15P or 20AP steel. These materials are crystalline materials.
  • a disadvantage of the crystalline metal components is their low mechanical strength when high stresses are applied.
  • each material is characterized by its Young's modulus E also called modulus of elasticity (generally expressed in GPa), characterizing its resistance to deformation.
  • Each material is also characterized by its elastic limit ⁇ ⁇ (generally expressed in GPa) which represents the stress beyond which the material deforms plastically.
  • the efficiency of an escapement is related to the energy restitution factor during shocks, these shocks being the shocks between the pallets of the anchor of the escape wheel and the shocks between the ankle of the plate and the fork entrance.
  • the kinetic energy accumulated during the displacement of the anchor or the escape wheel is dependent on the moment of inertia which is a function of the mass and the radius of inertia, and therefore dimensions.
  • the maximum energy that can be stored elastically is calculated as the ratio between the square of the elastic limit ⁇ ⁇ on the one hand and the Young's modulus E on the other hand, the low elastic limit of the crystalline metals leads to a low level of energy storage capacity.
  • the steels 15P or 20AP are dense and therefore the anchors and Exhaust wheels have strong masses. The moment of inertia is then high and the kinetic energy accumulated during the movements of the anchor and the escape wheel is important.
  • watchmaking traditionally uses hardened sulfur-lead carbon steels that offer good machinability and very good mechanical properties, but which are magnetic.
  • Non-magnetic alternatives are rare and generally more difficult to machine and offer poorer mechanical properties.
  • an escape wheel is different from a conventional gear wheel because it does not work according to the same principle. Indeed, such an escape wheel is driven by the mainspring and its rotation is controlled by the exhaust system which, via the balance spring, the anchor and the pallets, releases and stops successively rotation of said wheel. So, after the release and impulse phase, the tooth of the escape wheel abuts violently against the resting plane of the pallet of the anchor. These violent shocks repeated at each pulse imply a very different stress on the escape wheel in comparison with a gear wheel.
  • Such an escape wheel must therefore be made of a material having a high elastic limit in order to avoid any plastic deformation during these repeated impacts.
  • the wheel during the impulse phase, when the tooth of the escape wheel is on the impulse plane of the anchor, the wheel must transmit a maximum of energy to the anchor so that the latter can give it back to the pendulum. It is therefore important that the material used for the escape wheel has as high a factor of energy restitution as possible in order to minimize the losses and thus to increase the efficiency of the system.
  • the invention aims to overcome the disadvantages of the prior art by proposing to provide an exhaust system with higher efficiency and simpler to achieve.
  • the invention relates to the exhaust system cited above which is characterized in that at least a portion of the exhaust system is made of an at least partially amorphous metal alloy.
  • a first advantage of the present invention is to allow the exhaust system to have a better energy restitution factor than current exhausts.
  • an amorphous metal is characterized by the fact that, during its manufacture, the atoms composing these amorphous materials do not arrange according to a particular structure as is the case for crystalline materials Thus, even if the Young's modules E of a crystalline metal and an amorphous metal are substantially identical, their elastic limits ⁇ ⁇ are different.
  • An amorphous metal is then differentiated by an elastic limit ⁇ ⁇ ⁇ higher than that a e c of the crystalline metal by a factor of two to three.
  • the elastic limit ⁇ ⁇ is increased making it possible to increase the ratio ⁇ ⁇ / ⁇ so that the stress limit beyond which the material does not return to its initial shape increases, and especially so that the maximum energy that can be stored and restored elastically increases.
  • Another advantage of the present invention is to allow great ease in shaping allowing the development of complicated shapes with greater precision.
  • the amorphous metals have the particular characteristic of softening while remaining amorphous for a certain time in a given temperature range [Tg - Tx] specific to each alloy (with Tx: crystallization temperature and Tg: glass transition temperature ). It is thus possible to shape them under a relatively low pressure stress and a low temperature then allowing the use of a simplified process compared to machining and stamping.
  • the anchor is made of an at least partially amorphous metal alloy.
  • only part of the anchor, such as the fork, is made of an at least partially amorphous alloy.
  • the pallets of the anchor are made of an at least partially amorphous metal alloy.
  • the pallets of the anchor and the anchor form a single piece.
  • the escape wheel is made of an at least partially amorphous metal alloy.
  • the plate is made of an at least partially amorphous metal alloy.
  • At least a portion of the exhaust system comprises recesses to reduce the moment of inertia of this part.
  • the recesses are through.
  • At least a portion of the exhaust system comprises thinned zones in order to reduce the moment of inertia of this part.
  • said anchor, said escape wheel and said plate are made of an at least partially amorphous metal alloy.
  • the material is totally amorphous. In another advantageous embodiment, the material is completely metallic
  • said metal alloy is non-magnetic.
  • FIG. 1 and 2 show schematically a timepiece exhaust system according to the invention
  • FIGs 1 and 2 an exhaust system 1 with its resonator 3, ie the balance spring.
  • the resonator 3 cooperates with the exhaust system 1 by means of a plate 5 mounted on the balance shaft.
  • the exhaust system 1 comprises a Swiss anchor 7 formed by a main face (visible in Figure 1) in projection.
  • the Swiss anchor 7 is mainly formed by a rod 9 connecting the fork 1 1 and arms 13.
  • the fork 1 1 has two horns 15 vis-à-vis under which is mounted a dart 17 to cooperate respectively with a pin fixed on said plate 5 of the balance shaft and the lower part of said plate 5.
  • the rod 9 receives, between the two arms 13, a rod 19 for rotating the anchor between a bridge and the plate of the movement.
  • a pallet 21 intended to come into contact with the escape wheel 23 via its teeth 25.
  • the pallets may, for example, be formed in synthetic ruby.
  • the present invention may also be used for the type coaxial escapement as in watchmaking.
  • At least a part of the exhaust system 1, that is to say the plate 5 or the anchor 7 or the escape wheel 23 is made of a metal alloy at least partially amorphous.
  • This metal alloy may contain a precious metal element such as gold, platinum, palladium, rhenium, ruthenium, rhodium, silver, iridium or osmium. It will be understood by at least partially amorphous metal alloy that the material is able to solidify at least partially in the amorphous phase.
  • all parts of the exhaust system 1 are made of an at least partially amorphous metal alloy. Nevertheless, these parts can be made of different amorphous materials. Likewise, the metal alloy or the metal may be totally amorphous.
  • this at least partially amorphous metal alloy is non-magnetic so that said exhaust system 1 is insensitive to external magnetic disturbances.
  • amorphous metal alloys comes from the fact that, during their manufacture, the atoms composing these amorphous materials do not arrange in a particular structure as is the case for crystalline materials. Thus, even if the Young E moduli of a crystalline metal and an amorphous metal are substantially identical, their limits elastic ⁇ ⁇ are different. An amorphous metal is then differentiated by an elastic limit ⁇ ⁇ ⁇ higher than that e e c of the crystalline metal by a factor substantially equal to two. A higher elastic limit therefore means that a piece of amorphous metal alloy or amorphous metal deforms plastically under a higher stress than the same piece of crystalline metal.
  • the losses of an exhaust system 1 are related to the friction between the pallets 21 of the anchor 7 and the teeth 25 of the escape wheel 23 during the training phase and between the plate pin 5 and the entry of the fork and the shocks between the teeth 25 of the escape wheel 23 and the pallets 21 of the anchor 7 during the fall phase.
  • the losses due to shocks between the teeth 25 of the escape wheel 23 and the pallets 21 of the anchor 7 during the fall phase are a function of the kinetic energy.
  • This kinetic energy, accumulated during the operation of the exhaust system 1, is dependent on the moment of inertia.
  • This moment of inertia is a function of the mass and the radius of inertia.
  • the maximum specific resistance is of the order of 200-250 MPa * cm 3 / g.
  • the specific resistance of the amorphous alloys is of the order of 300-400 MPa * cm 3 / g.
  • Another solution is to reduce the mass of the part by removing material, preferably in the areas contributing most to the moment of inertia, that is to say in the parts furthest from the axis of rotation of the room. It is possible, for example, to make recesses 29, crossing or not, and / or to locally reduce the thickness 27 of the part.
  • an amorphous alloy having a mechanical strength greater than the crystalline alloy will be chosen. Given the advantageous specific resistance of the amorphous alloys, the density of the amorphous alloy may be chosen to be equal to or slightly less than that of the crystalline alloy and consequently the moment of inertia of the system 1 will be decreased.
  • a third possibility is to reduce the dimensions of the elements of the exhaust system 1 such as the anchor 7 or the wheel 23 or the plate 5.
  • an amorphous alloy of higher mechanical strength than the crystalline alloy used for the current dimensions this reduction in dimensions and mass does not lead to a decrease in the mechanical strength of the exhaust system 1.
  • the specific resistance of the amorphous alloys being greater in comparison with the crystalline alloys, the density of the amorphous alloy chosen may be equal to or less than that of the crystalline alloy used for the standard part, and consequently the time of inertia as well as the congestion of the system 1 can be reduced.
  • it will be chosen to reduce the mass of the parts of the exhaust system 1 which are metal or amorphous metal alloy. This makes it possible to keep the same size as an exhaust system 1 made of crystalline material and thus to keep standard dimensions while having a better resistance to stresses.
  • the amorphous metal allows great ease in shaping allowing the development of complicated shapes with greater precision. This is due to the specific characteristics of the amorphous metal that can soften while remaining amorphous during a time in a temperature range [Tg - Tx] gave specific to CHAQ ⁇ ue ALLIAG ae (Vpr-ar example for ALLIAG has e Zr 4 1.24 13.75 Ti Cu 12.5 Ni 10 Be 2_2.5 '
  • the use of such a material also makes it possible to reproduce fine geometries very precisely because the viscosity of the alloy decreases sharply as a function of the temperature in the temperature range [Tg-Tx] and the alloy thus allies the details of the negative.
  • the shaping is done around 300 ° C for a viscosity up to 10 3 Pa.s for a stress of 1 MPa, instead of a viscosity of 10 12 Pa. s at temperature Tg.
  • the use of dies has the advantage of creating highly accurate three-dimensional parts, which can not be cut or stamped.
  • One method used is the hot forming of an amorphous preform.
  • This preform is obtained by melting the metal elements intended to constitute the amorphous alloy in a furnace. Once these elements are melted, they are cast as a semi-finished product, then cooled rapidly to maintain the at least partially amorphous state. Once the preform realized, the hot forming is carried out in order to obtain a final piece.
  • This hot forming is performed by pressing in a temperature range between its glass transition temperature Tg and its crystallization temperature Tx for a predetermined time to maintain a totally or partially amorphous structure. This is done in order to maintain the characteristic elastic properties of the amorphous metals.
  • the pressing time should not exceed 120 seconds.
  • hot forming makes it possible to maintain the at least partially initial amorphous state of the preform.
  • the elements of the exhaust system can be made by casting or injection. This process involves casting the alloy obtained by melting the metal elements in a mold having the shape of the final piece. Once the mold is filled, it is rapidly cooled to a temperature below T g in order to avoid the crystallization of the alloy and thus obtain a system 1 of amorphous or partially amorphous metal.
  • pallets 21 of the anchor 7 are made of metal or amorphous alloy. These pallets 21 can form one and the same piece with said anchor or be overmolded after manufacture of the anchor 7. It then becomes possible that the pallets 21 and the anchor 7 are made of metal or amorphous alloy but different from each other. one of the other.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Gears, Cams (AREA)
  • Micromachines (AREA)
  • Forging (AREA)
  • Laminated Bodies (AREA)
EP11726830.0A 2010-06-22 2011-06-22 Hemmungssystem einer uhr Active EP2585876B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11726830.0A EP2585876B1 (de) 2010-06-22 2011-06-22 Hemmungssystem einer uhr

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10166938A EP2400352A1 (de) 2010-06-22 2010-06-22 Hemmungssystem einer Uhr
EP11726830.0A EP2585876B1 (de) 2010-06-22 2011-06-22 Hemmungssystem einer uhr
PCT/EP2011/060511 WO2011161193A1 (fr) 2010-06-22 2011-06-22 Systeme d'echappement pour piece d'horlogerie

Publications (2)

Publication Number Publication Date
EP2585876A1 true EP2585876A1 (de) 2013-05-01
EP2585876B1 EP2585876B1 (de) 2021-02-17

Family

ID=43242969

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10166938A Withdrawn EP2400352A1 (de) 2010-06-22 2010-06-22 Hemmungssystem einer Uhr
EP11726830.0A Active EP2585876B1 (de) 2010-06-22 2011-06-22 Hemmungssystem einer uhr

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP10166938A Withdrawn EP2400352A1 (de) 2010-06-22 2010-06-22 Hemmungssystem einer Uhr

Country Status (6)

Country Link
US (1) US20130148480A1 (de)
EP (2) EP2400352A1 (de)
JP (1) JP5657107B2 (de)
CN (2) CN105319939B (de)
HK (1) HK1219545A1 (de)
WO (1) WO2011161193A1 (de)

Families Citing this family (15)

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JP5657106B2 (ja) * 2010-06-22 2015-01-21 ザ・スウォッチ・グループ・リサーチ・アンド・ディベロップメント・リミテッド 時計の衝撃吸収軸受
EP2757423B1 (de) * 2013-01-17 2018-07-11 Omega SA Bauteil für Uhrwerk
EP2757424B1 (de) * 2013-01-17 2018-05-16 Omega SA Bauteil für Uhrwerk
JP6236164B2 (ja) * 2013-12-23 2017-11-22 ニヴァロックス−ファー ソシエテ アノニム タイムピース用の非接触シリンダー脱進機構
EP2942147B1 (de) * 2014-05-08 2018-11-21 Nivarox-FAR S.A. Uhrhemmungsmechanismus ohne Schmierung
EP2945025B1 (de) * 2014-05-16 2018-02-07 Nivarox-FAR S.A. Uhrwerksmechanismus mit ungeschmierter Kontaktkupplung
EP2952971B1 (de) * 2014-06-05 2016-10-12 Nivarox-FAR S.A. Anker für Hemmungsmechanismus eines Uhrwerks
EP3170579A1 (de) * 2015-11-18 2017-05-24 The Swatch Group Research and Development Ltd. Verfahren zur herstellung eines teils aus amorphem metall
EP3179316B1 (de) * 2015-12-10 2021-09-15 Nivarox-FAR S.A. Kontaktlose zylindrische uhrhemmung
DE102015122613B4 (de) * 2015-12-22 2020-07-23 Lange Uhren Gmbh Sekundensprungeinrichtung einer Uhr
EP3208667A1 (de) * 2016-02-18 2017-08-23 The Swatch Group Research and Development Ltd Magnetisches hemmungsdrehteil eines uhrwerks
EP3273303A1 (de) * 2016-07-19 2018-01-24 Nivarox-FAR S.A. Bauteil für uhrwerk
EP3489763B1 (de) * 2017-11-22 2021-06-16 Nivarox-FAR S.A. Anker für die bewegungshemmung eines uhrwerks
WO2019123380A1 (fr) * 2017-12-20 2019-06-27 Patek Philippe Sa Geneve Ancre pour mouvement d'horlogerie
EP3882712B1 (de) 2020-03-18 2022-11-16 The Swatch Group Research and Development Ltd Mechanisches uhrwerk, dass mit einer uhrhemmung mit einem elastisch deformierbaren anker ausgestattet ist

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Also Published As

Publication number Publication date
EP2400352A1 (de) 2011-12-28
HK1219545A1 (zh) 2017-04-07
CN105319939B (zh) 2018-02-13
CN103026303A (zh) 2013-04-03
WO2011161193A1 (fr) 2011-12-29
US20130148480A1 (en) 2013-06-13
CN105319939A (zh) 2016-02-10
JP2013529779A (ja) 2013-07-22
JP5657107B2 (ja) 2015-01-21
EP2585876B1 (de) 2021-02-17

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