EP2730981B1 - Drehlager und unruhachse einer uhr - Google Patents

Drehlager und unruhachse einer uhr Download PDF

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Publication number
EP2730981B1
EP2730981B1 EP14154387.6A EP14154387A EP2730981B1 EP 2730981 B1 EP2730981 B1 EP 2730981B1 EP 14154387 A EP14154387 A EP 14154387A EP 2730981 B1 EP2730981 B1 EP 2730981B1
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EP
European Patent Office
Prior art keywords
bearing
balls
pivot
shaft according
counter
Prior art date
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Active
Application number
EP14154387.6A
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English (en)
French (fr)
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EP2730981A1 (de
Inventor
Alain Laager
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.)
MPS MICRO PRECISION SYSTEMS AG
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Mps Micro Precision Systems Ag
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Publication of EP2730981A1 publication Critical patent/EP2730981A1/de
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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
    • G04B31/012—Metallic bearings
    • G04B31/0123—Metallic bearings with metallic ball bearings and metallic roller bearings
    • 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
    • G04B31/02—Shock-damping bearings

Definitions

  • the present invention relates to a bearing for holding and allowing the rotation of a balance shaft of a wristwatch, or of any timepiece.
  • oils used for lubrication do not have an indefinite duration; they thicken and degrade after a while, necessitating periodic servicing of the watch. Moreover, these bearings always present, even new, a certain friction due to the viscosity of the oil.
  • CH191908 describes a miniature ball bearing
  • CH299774 describes a corundum bearing and balls. In the latter, however, the balls do not roll within a race, but are held by three circular openings in the bottom of the bearing.
  • the document FR1129445 describes embodiments of bearings for a balance shaft with ball bearings.
  • the axial thrust of the balance can be taken up directly by the bearing balls.
  • An object of the present invention is to provide a bearing for the balance pin of a watch without lubrication, resistant to shocks, with a more favorable coefficient of friction, not requiring periodic revisions or maintenance, and free of lubrication.
  • the figure 1 represents a ball bearing for a balance wheel of a clock movement.
  • the balance wheel (not visible) is integral with an axle 50, of which only one end is shown, which is maintained between the plate and the balance cock by two bearings.
  • a kitten 41 of cylindrical shape contains inside it balls 44 which can rotate inside the ring 42, the pierced element 45 and the counter-pivot 43 prevent the axial displacement of the balls 44.
  • the bearing of the invention does not requiring no lubricating oil, the pierced element 45 and the counter-pivot 43 are preferably flat and do not have any recesses.
  • the balls 44 and the counter-pivot element 43 are preferably made of a material that is free of lubrication, for example of ceramic, more preferably of zirconium oxide ceramics, or of a crystalline material with a low coefficient of friction and a sufficient mechanical strength, for example silicon, corundum or diamond.
  • satisfactory friction values can be obtained by choosing, for the balls 44 and the counter-pivot 43, a non-metallic material, or a material different from that of the pivot 55, which is usually made of steel.
  • the balls 44 roll inside a circular race formed by the internal surface of the ring 42, which is preferably made of steel, or stainless steel. Tests with four balls have given conclusive results, but the invention also includes variants comprising a greater or lesser number of balls.
  • the balls 44 and the elements 45 and 43 are assembled inside the chaton 41 permanently and unremovably, by crimping. Once the bearing is assembled, the four balls 44 are necessarily positioned at 90°, leaving between them an opening exactly sized to allow the passage of the pivot 55 with a desired radial contact force, and can in no case exit through the hole. 46.
  • the structure of the bearing of the invention does not provide for an internal race for the rolling of the balls 44, the balls being directly in contact with the lateral surface of the pivot 55.
  • This arrangement makes it possible to limit the diameter outside of the bearing, which involves a significant reduction in friction. Tests have shown that bearings according to the invention with an outside diameter of less than one millimeter, more preferably less than 0.9 millimeters, make it possible to achieve friction levels comparable to or better than conventional balance bearings, without the need to be lubricated. with oil.
  • the hole 46 of the pierced element 45 preferably allows the passage of the rod 51 of the balance shaft 50 without contact or friction.
  • the point 58 of the pivot 55 is preferably rounded and polished, so as to minimize friction during pivoting on the counter-pivot 43.
  • the counter-pivot element 43 will be made of synthetic corundum or ruby, ceramic of zirconium, silicon or diamond oxide or another material having the required mechanical and tribological properties; the pierced element 45, on the other hand, is not necessarily in direct contact with the axis 50 and, in this case, could be made with the same or with other materials, for example metal.
  • the landing shown in figure 2 comprises a kitten 41 having the characteristics explained above with a conical bearing surface 49.
  • the kitten 41 is housed inside a support element 60 having an internal conical surface 69, the profile of which corresponds to that of the bearing surface 49.
  • the bezel 41 is held elastically by the elastic flexible element 65, retained by the shoulder 62.
  • the elastic element 65 comprises radial arms 62, imparting an axial force (relatively in the direction of the balance shaft 50) on the base of the kitten 41, as well as centering arms 27 pressing radially on the side face of the kitten 41.
  • the elastic element 65 has both a function of recovery of the axial thrust of the pendulum and alignment of the bearing.
  • the paired surfaces 49 and 69 define a resting position of the kitten 41 and have a self-centering and self-aligning action.
  • the bezel 41 can move momentarily thanks to the elasticity of element 65; the geometry of the surfaces 49 and 69 is such that the kitten is automatically brought back by the elastic element 65 to a position aligned and centered with respect to the axis 50 in an exact and reproducible manner.
  • the picture 3 illustrates a different arrangement of the bearing of the invention.
  • the elastic element 65 is held in a groove 63 and comprises only three radial arms 66 exerting inclined forces on the kitten 41. Centering and alignment are ensured by the symmetry of the elastic forces and by the conical surfaces 49 and 69, as in the previous example.
  • the support element 60 could, depending on the case, be a removable element or else a part machined directly in a more complex element of a watch movement, such as the plate for example.
  • the support 60 is a removable element with standardized dimensions, which can take the place, with a minimum of modifications, of the pendulum bearing supports in stone-built movements of the conventional type.
  • the kitten 41 is housed in a chamfered hole passing through the support 60 and held by an elastic element 65 comprising radial arms 66, as in the figure 2 , and "S"-shaped centering arms 68 passing through the chamfered hole, and the free end of which rests on a face of the support element 60, while a handle of the "S"-shaped arms 68 contacts the surface lateral kitten 41, with a centering action.
  • a shoulder 47 prevents the bezel from falling when the pin 50 is removed.
  • this variant makes it possible to fix the bearing on the support 60 by the single elastic element 65 without other fixing elements, moreover the machining of the support 60 is limited to a simple chamfered hole.
  • This embodiment therefore makes it possible to integrate the bearing of the invention into existing complex parts, for example, a plate or a watch movement bridge, with a minimum of adaptations.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Sliding-Contact Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Claims (9)

  1. Lager und Ausgleichswelle (50) für ein Uhrwerk, wobei das Lager eine Fassung (41) umfasst, die eine Vielzahl von Kugeln (44) umschließt, die in einem kreisförmigen Laufring (42) drehbar sind, wobei die axiale Bewegung der Kugeln (44) durch ein Gegenschwenkelement (43) und ein gebohrtes Element (45) mit einer Ausnehmung (46), das das Einführen eines Zapfens der Ausgleichswelle in einen Raum zwischen den Kugeln (44) ermöglicht, begrenzt ist, wobei das Lager so angeordnet ist, dass es die Achse zwischen den Kugeln (44) schwenkt, wobei die Kugeln (44) und/oder das Gegenschwenkelement (43) aus einem nichtmetallischen Material bestehen, wobei die Kugeln (44), das gebohrte Element (45) und das Gegenschwenkelement (43) im Inneren der Fassung (41) durch Quetschen zusammengefügt werden, wobei die Kugeln (44) zwischen sich eine Öffnung lassen, die den Durchgang des Zapfens der Ausgleichswelle (50) ermöglicht und nicht durch die Ausnehmung (46) des gebohrten Elements (45) austreten kann, dadurch gekennzeichnet, dass der Drehzapfen wenn dieser in den Zwischenraum eingeführt wird, die Spitze des Drehzapfens an dem Gegenschwenkelement (43) anliegt.
  2. Lager und Ausgleichswelle nach dem vorhergehenden Anspruch, wobei das Lager ein elastisches Rückhalteelement (65) für die Fassung (41) umfasst, das so angeordnet ist, dass es bei einem Stoss eine momentane Verschiebung der Fassung (41) aus einer Ruheposition ermöglicht und sie automatisch in die Ruheposition zurückbringt.
  3. Lager und Ausgleichswelle nach einem der vorhergehenden Ansprüche, mit vier Kugeln (44).
  4. Lager und Ausgleichswelle nach einem der vorhergehenden Ansprüche, mit mehr als vier Kugeln (44).
  5. Lager und Ausgleichswelle nach einem der vorhergehenden Ansprüche, wobei die Kugeln (44) und/oder das Gegenschwenkelement (43) aus einem der folgenden Materialien bestehen: Keramik, Zirkoniumoxid-Keramik, Silizium, Diamant.
  6. Lager und Ausgleichswelle nach einem der vorhergehenden Ansprüche, wobei die Fassung (41) eine konische Oberfläche (49) aufweist und in einem Trägerelement (60) mit einer konischen Innenfläche (69) mit demselben Profil untergebracht ist.
  7. Lager und Ausgleichswelle nach einem der Ansprüche 2 bis 6, wobei das elastische Halteelement eine Vielzahl von radialen Armen (66) umfasst, die auf der Fassung (41) aufliegen.
  8. Lager und Ausgleichswelle nach einem der vorhergehenden Ansprüche, wobei das Lager ferner eine Vielzahl von Zentrierarmen (67, 68) aufweist, die auf eine Seitenfläche der Fassung (41) wirken.
  9. Lager und Ausgleichswelle nach einem der vorhergehenden Ansprüche, wobei das Lager einen Außendurchmesser von weniger als einem Millimeter oder weniger als 0,9 Millimeter hat.
EP14154387.6A 2010-02-26 2011-02-04 Drehlager und unruhachse einer uhr Active EP2730981B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00307/10A CH702722A1 (fr) 2010-02-26 2010-02-26 Palier pour un axe de balancier d'une pièce d'horlogerie et pièce d'horlogerie équipée d'un tel palier.
EP11153456.6A EP2362280B1 (de) 2010-02-26 2011-02-04 Lagerung für die Unruhwelle einer Uhr und Uhr mit dieser Lagerung

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP11153456.6A Division EP2362280B1 (de) 2010-02-26 2011-02-04 Lagerung für die Unruhwelle einer Uhr und Uhr mit dieser Lagerung
EP11153456.6A Division-Into EP2362280B1 (de) 2010-02-26 2011-02-04 Lagerung für die Unruhwelle einer Uhr und Uhr mit dieser Lagerung

Publications (2)

Publication Number Publication Date
EP2730981A1 EP2730981A1 (de) 2014-05-14
EP2730981B1 true EP2730981B1 (de) 2022-04-13

Family

ID=42333291

Family Applications (2)

Application Number Title Priority Date Filing Date
EP14154387.6A Active EP2730981B1 (de) 2010-02-26 2011-02-04 Drehlager und unruhachse einer uhr
EP11153456.6A Active EP2362280B1 (de) 2010-02-26 2011-02-04 Lagerung für die Unruhwelle einer Uhr und Uhr mit dieser Lagerung

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP11153456.6A Active EP2362280B1 (de) 2010-02-26 2011-02-04 Lagerung für die Unruhwelle einer Uhr und Uhr mit dieser Lagerung

Country Status (2)

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EP (2) EP2730981B1 (de)
CH (1) CH702722A1 (de)

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1054299A (de) *
CH192767A (fr) * 1934-03-20 1937-08-31 Erismann Schinz S A Fabrique D Dispositif amortisseur de chocs pour pivots.
CH191908A (fr) * 1936-09-04 1937-07-15 A Billes Miniatures Roulements Roulement à billes ou à rouleaux.
FR1011463A (fr) * 1949-02-14 1952-06-23 Agencement de palier à billes pour arbres montés sur pivot conique et, par exemple, pour pivots de balancier des montres
CH305806A (de) * 1952-01-29 1955-03-15 Barth Gottlieb Kugellager, insbesondere für feinmechanische Zwecke.
CH299774A (fr) * 1952-03-07 1954-06-30 Sandoz Charles Palier amortisseur de chocs.
CH304791A (fr) * 1953-02-06 1955-01-31 Parechoc Sa Palier amortisseur de chocs pour pièce d'horlogerie.
CH318236A (fr) * 1954-05-21 1956-12-31 Erismann Schinz S A Palier amortisseur de chocs
CH322331A (fr) * 1954-11-17 1957-06-15 Parechoc S A Le Sentier Palier à billes pour axe de mobile d'horlogerie
CH366000A (fr) 1960-11-07 1963-01-15 Novochoc S A Palier amortisseur de chocs pour axe de balancier d'horlogerie
CH444963A4 (de) * 1963-04-08 1964-12-31
FR1393838A (fr) * 1964-05-05 1965-03-26 Parechoc Sa Palier amortisseur de chocs pour mobile d'horlogerie ou de petite mécanique et procédé pour sa fabrication
US6755566B2 (en) * 2001-02-15 2004-06-29 Konrad Damasko Clockwork
WO2005059663A1 (fr) * 2003-12-19 2005-06-30 Incabloc Sa Bloc palier muni d'un coussinet et d'une raquette

Also Published As

Publication number Publication date
EP2730981A1 (de) 2014-05-14
EP2362280B1 (de) 2016-07-20
EP2362280A1 (de) 2011-08-31
CH702722A1 (fr) 2011-08-31

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