EP2977834B1 - Stossdämpfer-gleitlager für eine uhr - Google Patents

Stossdämpfer-gleitlager für eine uhr Download PDF

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Publication number
EP2977834B1
EP2977834B1 EP15176877.7A EP15176877A EP2977834B1 EP 2977834 B1 EP2977834 B1 EP 2977834B1 EP 15176877 A EP15176877 A EP 15176877A EP 2977834 B1 EP2977834 B1 EP 2977834B1
Authority
EP
European Patent Office
Prior art keywords
shock absorber
absorber bearing
springs
imaginary axis
spring
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.)
Active
Application number
EP15176877.7A
Other languages
English (en)
French (fr)
Other versions
EP2977834A2 (de
EP2977834A3 (de
Inventor
Carla Lambert
Aurélien BLONDEAU
Olivier Karlen
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
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Filing date
Publication date
Application filed by Richemont International SA filed Critical Richemont International SA
Publication of EP2977834A2 publication Critical patent/EP2977834A2/de
Publication of EP2977834A3 publication Critical patent/EP2977834A3/de
Application granted granted Critical
Publication of EP2977834B1 publication Critical patent/EP2977834B1/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
    • G04B31/02—Shock-damping 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
    • G04B31/004—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
    • G04B31/02—Shock-damping bearings
    • G04B31/04—Shock-damping bearings with jewel hole and cap jewel

Definitions

  • the present invention relates to a shock absorbing bearing for a timepiece.
  • the pivots of the axes of the mobiles turn in bearings mounted in the plate or in bridges.
  • the pivots of the axis of a beam are generally thin and the weight of the balance is relatively high, said pivots can break under the effect of a shock in the absence of damper system.
  • a shock absorbing bearing comprising a one-piece piece itself comprising a central portion, a peripheral portion and a resilient member connecting the central portion to the peripheral portion.
  • the central portion has a hole for receiving a pivot.
  • the elastic member comprises elastic arms wound spirally.
  • This one-piece piece is fixed in a cup-shaped intermediate piece mounted in a frame member (plate, bridge), or is fixed directly in the frame member.
  • the elastic member comprises laced arms each connecting the central portion of the one-piece piece to the central portion of a respective circular elastic ring segment supported by its two ends against the inner wall of the intermediate piece.
  • Each lacy arm forms with the respective elastic segment a spring.
  • the elastic segments participate in the deformation and the displacement of the axis of the mobile is relatively important.
  • the active length of said spring is reduced and the restoring force is increased. Moving the axis of the mobile during a great shock is therefore smaller in proportion than in a small shock. This feature improves the effectiveness of the anti-shock system.
  • this bearing offers little flexibility to obtain a displacement / force curve of the desired impact.
  • the stressing of the lace arms and peripheral elastic segments by the intermediate piece during assembly makes said curve dependent on the machining accuracy of the intermediate piece.
  • Another disadvantage of this bearing is that it is able to differentiate small and large shocks only in the radial direction. To obtain the same effect in the axial direction, a particular assembly, with an additional monoblock piece superimposed, is proposed. This assembly increases the size and complicates the manufacture.
  • the present invention aims to remedy, at least in part, the aforementioned drawbacks and proposes for this purpose a shock absorbing bearing for a timepiece, comprising a one-piece piece defining a central portion, a peripheral portion and an elastic member connecting the portion central to the peripheral portion, the central portion having a hole for receiving a pivot, characterized in that the elastic member comprises at least one movable intermediate portion surrounding the imaginary axis of said hole, a first spring comprising at least one elastic arm connecting the central portion to one or more movable intermediate portions and a second spring comprising at least one elastic arm connecting the one or more of the movable intermediate portions to the peripheral portion, and in that the first and second springs have different stiffnesses in at least one of the direction of said imaginary axis and the radial direction by port to said imaginary axis.
  • the first and second springs have different stiffnesses both in the direction of said imaginary axis and in the radial direction with respect to said imaginary axis.
  • the stiffness of the first spring in the direction of said imaginary axis and in the radial direction with respect to said imaginary axis is smaller than that of the second spring.
  • the first and second springs have different heights.
  • height is meant in the context of the present invention the dimension in the direction of said imaginary axis.
  • the height of each of the first and second springs can be constant.
  • the height of the elastic member may vary gradually.
  • each resilient arm of each of the first and second springs may be spirally wound about said imaginary axis.
  • the first and second springs may each comprise a plurality of resilient arms.
  • said elastic arms are preferably regularly distributed around said imaginary axis.
  • Stops may be provided on the at least one of the movable intermediate portions and / or on the peripheral portion to limit the deformation of at least one of the first and second springs.
  • said hole is blind.
  • the or each mobile intermediate portion and / or the peripheral portion are rigid, that is to say they do not deform or almost not in the direction of said imaginary axis and in the radial direction relative to said imaginary axis.
  • the one-piece piece may be made of silicon, amorphous metal alloy or nickel or nickel-phosphorus alloy, for example.
  • the shock absorbing bearing comprises a single movable intermediate portion.
  • a shock absorbing bearing for a timepiece comprises a one-piece piece 1 fixed in a hole 2 of a frame member 3 such as a plate or a bridge.
  • the one-piece piece 1 has the shape of a circular plate of variable height. It may be made in a silicon (monocrystalline or polycrystalline) plate or other crystalline material by a known etching process.
  • the one-piece piece 1 may alternatively be made of an amorphous metal alloy (metal glass), for example by casting and molding, or in a nickel or nickel-phosphorus alloy compatible with the LIGA manufacturing process.
  • the frame member 3 may itself be made of a conventional metal such as brass.
  • the one-piece part 1 comprises a central portion 4, a peripheral portion 5 and an elastic member 6 connecting the central portion 4 to the peripheral portion 5.
  • the central portion 4 has a blind hole 7 for receiving a pivot 8 of an axis mobile 9, such as a balance shaft.
  • the peripheral portion 5 has an annular shape and is dimensioned to be fixed, for example by gluing, in the hole 2 of the frame member 3.
  • the elastic member 6 comprises a first spring 10a, a second spring 10b and a mobile intermediate portion 11 of annular shape surrounding the part 4 and providing the connection between the first and second springs 10a, 10b.
  • the central, peripheral and intermediate portions 4, 5, 11 are typically rigid, and they are at least stiffer than the first and second springs 10a, 10b.
  • Each of the springs 10a, 10b comprises elastic arms 12a, 12b spirally wound around the common imaginary axis 13 of the hole 7, the one-piece part 1 and the mobile axis 9.
  • Each arm 12a of the first spring 10a is joined to the central portion 4 by one of its ends and the movable intermediate portion 11 by its other end.
  • Each arm 12b of the second spring 10b is joined to the movable intermediate portion 11 at one of its ends and to the peripheral portion 5 at its other end.
  • the arms 12a, 12b of each of the springs 10a, 10b are regularly distributed around the imaginary axis 13 and, in the example shown, are three in number.
  • the spiral shape of each arm 12a, 12b may comprise two arcs of circle centered on the imaginary axis 13, of different radii and connected to each other, as shown.
  • the height of the monobloc piece 1 is variable. More specifically, the assembly consisting of the central portion 4 and the first spring 10a has a height h1 less than the height h2 of the assembly constituted by the movable intermediate portion 11, the second spring 10b and the peripheral portion 5, thereby defining a central recess 14 in the surface of the one-piece piece 1 facing the mobile carried by the axis 9.
  • the springs 10a, 10b have different stiffnesses, the stiffness of the second spring 10b being larger than the stiffness of the first spring 10a.
  • bumps 15 are provided on the outer surface of the movable intermediate portion 11 and on the inner surface of the peripheral portion 5 to serve as radial stops to the arms 12b of the second spring 10b limiting the deformation of the latter.
  • Such bumps could also be provided on the inner surface of the movable intermediate portion 11 and on the surface of the central portion 4 to limit the deformation of the arms 12a of the first spring 10a.
  • the bearing according to the invention further comprises, typically, axial and radial abutments to prevent deformation of the elastic member 6 beyond a certain limit.
  • These stops are defined by a washer 16 fixed to the frame member 3 and whose central hole 17 is traversed with a certain clearance by the mobile axis 9, more precisely by a tigger 18 of this axis carrying the pivot 8.
  • the wall of the hole 17 constitutes the radial abutment, against which the tigeron 18 can come to rest during a large radial shock.
  • the surface 19 of the washer 16 facing the mobile carried by the axis 9 constitutes the axial abutment, against which a shoulder 20 of the axis 9 can come to bear during a large axial impact.
  • the figure 4 shows the radial or axial displacement curve of the pivot 8 as a function of the impact force, obtained with the bearing according to the invention.
  • a threshold S1 trigger threshold
  • the forces generated by the acceleration of the mass of the mobile are less than the force of the first spring 10a, there is therefore no movement of the elastic member 6.
  • the force due to the acceleration of the mass of the mobile is greater than that of the first spring 10a and lower than that of the second spring 10b.
  • the axis of mobile 9 moves by deforming the first spring 10a without deforming the second spring 10b or moving the movable intermediate portion 11, and without coming into contact with the Washer 16.
  • the height of the springs 10a, 10b is an easily manipulated parameter.
  • other parameters such as the thickness of the arms 12a, 12b can be varied.
  • the thickness of the arms 12b of the second spring 10b is greater than that of the arms 12a of the first spring 10a to compensate for the fact that the arms 12b have a greater length than the arms 12a.
  • each of the springs 10a, 10b is not necessarily constant.
  • the figure 5 illustrates a second embodiment of the invention in which the height of the elastic member 6 ', and even of the one-piece piece 1' as a whole, varies progressively, giving for example to the surface of the one-piece piece opposite to the surface turned towards the mobile, a bowl shape.
  • the number of springs 10a, 10b in the bearing according to the invention is not necessarily limited to two. It can be equal to three, four, etc.
  • the second spring 10b could connect the movable intermediate portion 11 to a second movable intermediate portion
  • a third spring could connect the second movable intermediate portion to the peripheral portion 5.
  • the stiffness of the springs 10a, 10b can be reversed.
  • the springs located closer to the central portion 4 could have a high stiffness and the springs located closer to the periphery 5 could have a small stiffness.
  • the one-piece character of the part 1 facilitates the mounting of the bearing.
  • the bearing according to the invention does not need an intermediate piece or cage between the one-piece piece 1 and the frame member 3 (cf. figure 1 ). However, the use of such an intermediate part is not excluded in the present invention.
  • a coating of a material known for its good tribological properties can be formed on the one-piece part 1 (or only on the wall of its hole 7) and / or on the pivot 8.
  • said material may be sapphire, diamond, amorphous carbon (DLC: Diamond-Like Carbon) or silicon oxide.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Springs (AREA)
  • Vibration Dampers (AREA)

Claims (15)

  1. Stoßdämpferlager für Uhren, das ein Teil (1) aus einem Stück umfasst, das einen mittleren Teil (4), einen Umfangsteil (5) und ein elastisches Organ (6) definiert, das den mittleren Teil (4) mit dem Umfangsteil (5) verbindet, wobei der mittlere Teil (4) ein Loch (7) aufweist, das dazu bestimmt ist, einen Zapfen (8) aufzunehmen, dadurch gekennzeichnet, dass das elastische Organ (6) mindestens einen beweglichen Zwischenteil (11), der die gedachte Achse (13) des Lochs (7) umgibt, eine erste Feder (10a), die mindestens einen elastischen Arm (12a) umfasst, der den mittleren Teil (4) mit dem oder einem der beweglichen Zwischenteile (11) verbindet, und eine zweite Feder (10b) umfasst, die mindestens einen elastischen Arm (12b) umfasst, der den oder einen anderen von den beweglichen Zwischenteilen (11) mit dem Umfangsteil (5) verbindet, und dadurch, dass die erste und die zweite Feder (10a, 10b) in mindestens einer von der Richtung der gedachten Achse (13) und der in Bezug zu der gedachten Achse (13) radialen Richtung unterschiedliche Steifigkeiten aufweisen.
  2. Stoßdämpferlager nach Anspruch 1, dadurch gekennzeichnet, dass die erste und die zweite Feder (10a, 10b) sowohl in der Richtung der gedachten Achse (13) als auch in der in Bezug zu der gedachten Achse (13) radialen Richtung unterschiedliche Steifigkeiten aufweisen.
  3. Stoßdämpferlager nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Steifigkeit der ersten Feder (10a) in der Richtung der gedachten Achse (13) und in der in Bezug zu der gedachten Achse (13) radialen Richtung kleiner ist als diejenige der zweiten Feder (10b) .
  4. Stoßdämpferlager nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die erste und die zweite Feder (10a, 10b) unterschiedliche Höhen aufweisen.
  5. Stoßdämpferlager nach Anspruch 4, dadurch gekennzeichnet, dass die Höhe von jeder von der ersten und der zweiten Feder (10a, 10b) konstant ist.
  6. Stoßdämpferlager nach Anspruch 4, dadurch gekennzeichnet, dass die Höhe des elastischen Organs (6) schrittweise variiert.
  7. Stoßdämpferlager nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der oder jeder elastische Arm (12a, 12b) von jeder von der ersten und der zweiten Feder (10a, 10b) spiralförmig um die gedachte Achse (13) gewickelt ist.
  8. Stoßdämpferlager nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die erste und die zweite Feder (10a, 10b) jeweils mehrere elastische Arme (12a, 12b) umfassen.
  9. Stoßdämpferlager nach Anspruch 8, dadurch gekennzeichnet, dass die elastischen Arme (12a, 12b) von jeder von der ersten und der zweiten Feder (10a, 10b) gleichmäßig um die gedachte Achse (13) herum verteilt sind.
  10. Stoßdämpferlager nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass es Anschläge (15) auf dem oder mindestens einem von den beweglichen Zwischenteilen (11) und/oder auf dem Umfangsteil (5) umfasst, um die Verformung von mindestens einer von der ersten und der zweiten Feder (10a, 10b) zu begrenzen.
  11. Stoßdämpferlager nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass das Loch (7) ein Blindloch ist.
  12. Stoßdämpferlager nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass der oder jeder bewegliche Zwischenteil (11) starr ist.
  13. Stoßdämpferlager nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass der Umfangsteil (5) starr ist.
  14. Stoßdämpferlager nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass das Teil (1) aus einem Stück aus Silizium, aus amorpher Metalllegierung oder aus Nickel- oder Nickel-Phosphor-Legierung besteht.
  15. Stoßdämpferlager nach einem der Ansprüche 1 bis 14, das ein einziges bewegliches Zwischenteil (11) umfasst.
EP15176877.7A 2014-07-22 2015-07-15 Stossdämpfer-gleitlager für eine uhr Active EP2977834B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH01109/14A CH709908A1 (fr) 2014-07-22 2014-07-22 Palier amortisseur de choc pour pièce d'horlogerie.

Publications (3)

Publication Number Publication Date
EP2977834A2 EP2977834A2 (de) 2016-01-27
EP2977834A3 EP2977834A3 (de) 2016-03-23
EP2977834B1 true EP2977834B1 (de) 2019-02-20

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Family Applications (1)

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EP15176877.7A Active EP2977834B1 (de) 2014-07-22 2015-07-15 Stossdämpfer-gleitlager für eine uhr

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EP (1) EP2977834B1 (de)
CH (1) CH709908A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3067756B1 (de) * 2015-03-09 2017-11-22 Nivarox-FAR S.A. Schwenkbare einheit für eine uhr

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2015147A2 (de) * 2007-07-12 2009-01-14 Manufacture et fabrique de montres et chronomètres Ulysse Nardin Le Locle SA Stoßdämpfer-Gleitlager für eine Uhr

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1696286B1 (de) * 2005-02-23 2010-12-29 ETA SA Manufacture Horlogère Suisse Stoßdämpfende Uhrenlagerung
CH705112B1 (fr) * 2007-11-07 2012-12-31 Manuf Et Fabrique De Montres Et Chronometres Ulysse Nardin Le Locle Sa Palier amortisseur de chocs pour pièce d'horlogerie.
EP2400355A1 (de) * 2010-06-22 2011-12-28 The Swatch Group Research and Development Ltd. Stoßsicheres System für Uhr
CH707809B1 (fr) * 2013-03-19 2017-05-31 Nivarox Far Sa Palier pour mécanisme d'horlogerie.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2015147A2 (de) * 2007-07-12 2009-01-14 Manufacture et fabrique de montres et chronomètres Ulysse Nardin Le Locle SA Stoßdämpfer-Gleitlager für eine Uhr

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Publication number Publication date
EP2977834A2 (de) 2016-01-27
EP2977834A3 (de) 2016-03-23
CH709908A1 (fr) 2016-01-29

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