EP2551732B1 - Unruh mit optimierter Drehbewegung - Google Patents

Unruh mit optimierter Drehbewegung Download PDF

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Publication number
EP2551732B1
EP2551732B1 EP12177552.2A EP12177552A EP2551732B1 EP 2551732 B1 EP2551732 B1 EP 2551732B1 EP 12177552 A EP12177552 A EP 12177552A EP 2551732 B1 EP2551732 B1 EP 2551732B1
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EP
European Patent Office
Prior art keywords
pivot
balance wheel
pivoting
balance
arrangement
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EP12177552.2A
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English (en)
French (fr)
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EP2551732A1 (de
Inventor
Raphaël Cettour-Baron
Denis Rudaz
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Rolex SA
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Rolex SA
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/063—Balance construction

Definitions

  • the present invention relates to an arrangement for pivoting a pendulum for a watch movement.
  • the balance wheel axis includes pivots at its ends which rotate in bearings.
  • Existing solutions seek to minimize the friction between a pivot and the bearing to limit energy losses during the rotation of the axis considered.
  • FIGS. 1 and 2 schematically represent the pivoting of a pendulum axis of a timepiece movement according to a standard solution of the prior art.
  • a pivot 2 arranged at the end of an axis 1, comprises a surface 3 rounded at its end.
  • This pivot 2 cooperates with a bearing comprising a flat stone called a counter-pivot 13 and a stone comprising an olive hole called olive stone 12.
  • the figure 1 represents a first configuration in which the clockwork movement is in a horizontal position (relative to the ground), often called a "flat" position, and in which the pendulum axis is in a vertical position so that the surface 3 of the pivot 2 comes to bear on the counter-pivot 13.
  • the surface of friction between the pivot 2 and the bearing is low and the resulting friction is low.
  • the figure 2 represents a second configuration in which the clockwork movement is in a vertical position, often called the "hanged" position, and in which the axis 1 of the pendulum is in a horizontal position.
  • the pivot 2 comes to bear on the edge 14 of the hole in the olive stone 12, and the resulting friction becomes greater than in the first configuration explained above.
  • the amplitude of oscillation of the balance-spring assembly is then reduced compared to the first configuration.
  • the object of the invention consists in seeking a solution for pivoting a clockwork movement pendulum which reduces the "hang-down", while optimizing the energy losses and the overall performance of the pendulum.
  • the invention is based on an arrangement for pivoting a balance for a clockwork movement, according to claim 1.
  • the invention is firstly based on the use of a balance wheel which is characterized by a small diameter and / or a high inertia, ie a heavy balance wheel, compared to all those usually used.
  • a balance wheel which is characterized by a small diameter and / or a high inertia, ie a heavy balance wheel, compared to all those usually used.
  • This characterization of a clockwork movement balance is quantified by the factor D 5 ⁇ f / l, which is expressed in units 10 -2 m 3 kg -1 s -1 , where D is the diameter of the balance in meters, f the frequency of the balance / balance spring (forming a balance-spring oscillator) in Hz, I its inertia in 10 -10 kg ⁇ m 2 .
  • the diameter D of the pendulum is more precisely that of the outer periphery of the pendulum serge. If this serge has protrusions, such as adjusting nuts for example, the diameter to be considered will be an equivalent external diameter, obtained by considering a virtual pendulum with the same inertia but without the protrusions on the rim and which generates the same aerodynamic friction.
  • the invention is based on a balance or an oscillator which meets the condition D 5 ⁇ f / l ⁇ 16 10 -2 m 3 kg -1 s -1 .
  • the balance can include a diameter between 7 and 10 mm and an inertia greater than or equal to 12 10 -10 kg ⁇ m 2 when it is intended to equip a timepiece movement with a diameter greater than 20 mm and operating at a oscillation frequency of the balance spring of 4 Hz.
  • Such a balance will be particularly suitable for a movement with a high regulating power and will allow good chronometric performance to be achieved.
  • the balance can include a diameter less than or equal to 7 mm, in particular for a balance of inertia less than 10 10 -10 kg ⁇ m 2 intended to equip a timepiece movement with a diameter of less than 20mm and operating at an oscillation frequency of the balance spring of 4 Hz, or even for an inertia balance of less than 10 10 -10 kg ⁇ m 2 intended to equip a clockwork movement operating at an oscillation frequency of the balance spring 10 Hz.
  • the figure 3 thus represents a first embodiment, in which the surface 3 at the end of the pivot 2 is flat and comes to bear on a flat counter-pivot 13 in a horizontal position.
  • the figure 4 shows a second embodiment, in which the surface 3 at the end of the pivot 2 is hollow, of concave shape, substantially hemispherical, and comes to bear at its periphery on a flat pivot 13 in a horizontal position.
  • the figure 5 shows a third embodiment, in which the surface 3 at the end of the pivot 2 is flat and comes to bear on a hemispherical bowl of the counter-pivot 13 in a horizontal position.
  • the figure 6 shows a fourth embodiment, in which the end of the pivot 2 is conical and comes to bear on a hole 15 of the counter-pivot 13 in a horizontal position.
  • the diameter of the hole 15 of the pivot 13 is less than the base diameter of the pivot cone, so that the latter comes to bear on the edges of the hole 15 of the pivot 13, defining a well-controlled linear contact area.
  • the figure 7 shows a fifth embodiment, in which the surface 3 at the end of the pivot 2 is rounded, substantially hemispherical, and comes to bear on a hole 15 of the counter-pivot 13 in a horizontal position.
  • the figure 8 shows a sixth embodiment, close to the previous one, in which the surface 3 at the end of the pivot 2 is rounded and bears on a blind hole 15 of the counter-pivot 13 in a horizontal position.
  • the figure 9 shows a seventh embodiment, which is a variant of the previous one, in which the surface 3 at the end of the pivot 2 is rounded and bears on a blind hole 15 of the counter-pivot 13 in a horizontal position, this counter-pivot 13 being formed of two distinct parts.
  • the diameter of the hole is chosen so that the pivot does not get stuck in the hole.
  • the axis cooperating with the counter-pivot may be of rounded, hemispherical or conical shape, this shape being able to be adapted to the shape of the hole of the counter-pivot.
  • the portion 4 of the axis 1 which cooperates with the olive stone 12, in particular when the wristwatch is in a vertical position can be of cylindrical or conical section.
  • a counter-pivot could for example be chosen with a hole whose cross section along a plane perpendicular to the bearing surface of the counter-pivot, either triangular or trapezoidal, and / or whose section along a plane parallel to the bearing surface of the counter-pivot is circular or polygonal.
  • other embodiments can simply be obtained by the simple combination of the embodiments described above.
  • the figures 10 and 11 represent the quality factors as a function of the amplitude obtained respectively with a pendulum and a standard pivoting arrangement, as described on the Figures 1 and 2 , and a balance combined with a pivoting device according to an embodiment of the invention.
  • Curve 20 of the figure 10 shows the quality factor as a function of the amplitude in the horizontal position of the clock movement and curve 21 the quality factor in the vertical position. It appears that the quality factor in the horizontal position remains relatively constant while the quality factor in the vertical position is significantly lower and decreases rapidly with amplitude.
  • Curve 22 of the figure 11 shows the quality factor as a function of the amplitude in the horizontal position and the curve 23 the quality factor in the vertical position, in the case of a timepiece movement according to an embodiment of the invention.
  • the hanger is greatly reduced, as illustrated by the bringing together of the two curves 22, 23, over the entire amplitude range.
  • the geometry of the pivot of the pendulum axis and / or of the bearing is therefore suitable for relative friction between the pivot and the bearing in the horizontal position of the clockwork movement close to that obtained between the pivot and the bearing in the vertical position, resulting in a difference in amplitude between the horizontal and vertical positions preferably less than or equal to 20 °, less than or equal to 15 °, or even less than or equal to 10 °.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Sliding-Contact Bearings (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Toys (AREA)
  • Electromechanical Clocks (AREA)
  • Electric Clocks (AREA)
  • Gears, Cams (AREA)
  • Micromachines (AREA)

Claims (12)

  1. Schwenkanordnung einer Unruh eines Uhrwerks, umfassend ein Lager zum Schwenken der Unruh,
    umfassend eine Unruh, welche die folgende Bedingung erfüllt: D 5 ⋅ f / l ≤ 16 10 − 2 m 3 kg − 1 s − 1
    Figure imgb0001
     wobei D der Durchmesser der Unruh ist, f die Frequenz und I die Trägheit und umfassend
    eine Geometrie des Zapfens der Achse der Unruh und/oder des Lagers, welche für eine relative Reibung zwischen dem Zapfen und dem Lager der genannten Unruh in horizontaler Position geeignet ist, angenähert an diejenige zwischen dem Zapfen und dem Lager der genannten Unruh in vertikaler Position,
    dadurch gekennzeichnet, dass:
    • die Stirnfläche (3) am Ende des Zapfens (2) der Achse (1) der Unruh eben ausgebildet ist und gegen eine Oberfläche eines in horizontaler Position ebenen Decksteins (13) anliegt, oder, dass
    • die Stirnfläche (3) am Ende des Zapfens (2) konkav ausgebildet ist und gegen eine Oberfläche eines in horizontaler Position ebenen Decksteins (13) anliegt, oder, dass
    • die Stirnfläche (3) am Ende des Zapfens (2) eben ausgebildet ist und gegen eine Oberfläche eines in horizontaler Position konkaven, insbesondere halbkugelförmigen Decksteins (13) anliegt, oder, dass
    • das Ende des Zapfens (2) in einem Loch (15) des Decksteins (13) in horizontaler Position einliegt.
  2. Schwenkanordnung einer Unruh eines Uhrwerks gemäß dem vorangehenden Anspruch, dadurch gekennzeichnet, dass der Faktor D5·f/l der Unruh, ausgedrückt in 10-2m3kg-1s-1, die folgende Relation erfüllt: D 5 ⋅ f / l ≤ 13 , oder D 5 ⋅ f / l ≤ 10 , oder D 5 ⋅ f/l ≤ 8 .
    Figure imgb0002
  3. Schwenkanordnung einer Unruh für ein Uhrwerk gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Durchmesser der Unruh zwischen 7 und 10 mm liegt und die Trägheit der Unruh größer oder gleich 12 10-10 kg m2 ist.
  4. Schwenkanordnung einer Unruh für ein Uhrwerk gemäß einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass der Durchmesser der Unruh kleiner oder gleich 7 mm ist.
  5. Schwenkanordnung einer Unruh für ein Uhrwerk gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Unruh für eine Oszillation bei einer Frequenz von im Wesentlichen 4 Hz genutzt wird.
  6. Schwenkanordnung einer Unruh für ein Uhrwerk gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Ende des Zapfens (2) in horizontaler Position in einem Loch (15) des Decksteins (13) einliegt und, dass das Ende des Zapfens (2) konvex, halbkugelförmig, oder konisch abgerundet ist.
  7. Schwenkanordnung einer Unruh für ein Uhrwerk gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Ende des Zapfens (2) in horizontaler Position in einem Loch (15) des Decksteins (13) einliegt, wobei das Loch ein Sackloch ist.
  8. Schwenkanordnung einer Unruh für ein Uhrwerk gemäß dem vorangehenden Anspruch, dadurch gekennzeichnet, dass der Deckstein (13) aus zwei verschiedenen Teilstücken besteht.
  9. Schwenkanordnung einer Unruh für ein Uhrwerk gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Ende der Achse (1) der Unruh konvex, halbkugelförmig, oder konisch abgerundet ist.
  10. Schwenkanordnung einer Unruh für ein Uhrwerk gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Abschnitt (4) der Achse (1) der Unruh, welcher in Kontakt mit einem olivierten Stein (12) steht eine zylindrische oder konische Form aufweist.
  11. Uhrwerk, dadurch gekennzeichnet, dass es eine Schwenkanordnung einer Unruh gemäß einem der vorangehenden Ansprüche umfasst.
  12. Armbanduhr, dadurch gekennzeichnet, dass sie ein Uhrwerk gemäß dem vorangehenden Anspruch umfasst.
EP12177552.2A 2011-07-29 2012-07-24 Unruh mit optimierter Drehbewegung Active EP2551732B1 (de)

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EP11405295 2011-07-29
EP12177552.2A EP2551732B1 (de) 2011-07-29 2012-07-24 Unruh mit optimierter Drehbewegung

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EP2551732A1 EP2551732A1 (de) 2013-01-30
EP2551732B1 true EP2551732B1 (de) 2020-05-06

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US (1) US9016933B2 (de)
EP (1) EP2551732B1 (de)
JP (1) JP6231264B2 (de)
CN (1) CN102902193B (de)
CH (1) CH705292B1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6075250B2 (ja) * 2013-09-10 2017-02-08 トヨタ自動車株式会社 蓄電装置の温度調節構造及び温度調節方法
EP3382472A1 (de) * 2017-03-30 2018-10-03 Rolex Sa Führungslager einer unruhwelle einer uhr
US11392091B2 (en) * 2017-07-31 2022-07-19 Rolex Sa Watch pivot device
JP7485506B2 (ja) 2018-10-12 2024-05-16 ロレックス・ソシエテ・アノニム 小型時計ムーブメント用の調速装置
EP3671368B1 (de) * 2018-12-20 2022-11-23 The Swatch Group Research and Development Ltd Lager, insbesondere zur stossdämpfung, und drehteil eines uhrwerks
EP3839654B1 (de) * 2019-12-20 2024-06-26 Patek Philippe Sa Geneve Korrekturverfahren der ganggenauigkeit und/oder der amplitude an den positionen für einen uhroszillator vom typ spiralunruh
EP3839653A1 (de) * 2019-12-20 2021-06-23 Patek Philippe SA Genève Korrekturverfahren der ganggenauigkeit und/oder der amplitude eines oszillators vom typ spiralunruh mit vertikalen positionen

Citations (1)

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Publication number Priority date Publication date Assignee Title
EP2395402A1 (de) * 2010-06-11 2011-12-14 Montres Breguet SA Hochfrequenzunruh für Uhr

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CH239786A (fr) 1944-02-04 1945-11-15 Ditisheim & Cie Fabriques Vulc Dispositif de pivotement d'un arbre tel que l'arbre du balancier d'un mouvement d'horlogerie, d'un porte-échappement ou d'un compteur, par exemple.
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EP1805565B1 (de) 2004-10-26 2010-09-15 TAG Heuer SA Armbanduhr-regulierungsglied und mechanisches uhrwerk mit einem solchen regulierungsglied
CH702316B1 (fr) * 2005-03-31 2011-06-15 Montres Breguet Sa Dispositif antichoc pour pivot de balancier et mouvement horloger équipé de ce dispositif.
EP1986059A1 (de) 2007-04-26 2008-10-29 ETA SA Manufacture Horlogère Suisse Schwenkenvorrichtung einer Welle in einer Uhr
EP2104008A1 (de) * 2008-03-20 2009-09-23 Nivarox-FAR S.A. Monoblock-Regulierungsorgan und sein Herstellungsverfahren
EP2141555B1 (de) 2008-07-04 2011-04-06 The Swatch Group Research and Development Ltd. Gekoppelte Resonatoren für Uhr
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EP2410387B1 (de) * 2010-07-19 2016-07-06 Nivarox-FAR S.A. Unruh mit Trägheitsregulierung ohne Einsatzteil
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Also Published As

Publication number Publication date
US9016933B2 (en) 2015-04-28
US20130028056A1 (en) 2013-01-31
CH705292B1 (fr) 2016-12-15
JP6231264B2 (ja) 2017-11-15
JP2013033037A (ja) 2013-02-14
EP2551732A1 (de) 2013-01-30
CH705292A2 (fr) 2013-01-31
CN102902193B (zh) 2015-11-25
CN102902193A (zh) 2013-01-30

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