EP3422117B1 - Stossdämpfer-gleitlager für eine achse einer drehteil einer uhr - Google Patents

Stossdämpfer-gleitlager für eine achse einer drehteil einer uhr Download PDF

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Publication number
EP3422117B1
EP3422117B1 EP17178829.2A EP17178829A EP3422117B1 EP 3422117 B1 EP3422117 B1 EP 3422117B1 EP 17178829 A EP17178829 A EP 17178829A EP 3422117 B1 EP3422117 B1 EP 3422117B1
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EP
European Patent Office
Prior art keywords
bearing
wall
centring
external
support
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Active
Application number
EP17178829.2A
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English (en)
French (fr)
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EP3422117A1 (de
Inventor
Pierre Cusin
Ivan Hernandez
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Nivarox Far SA
Nivarox SA
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Nivarox Far SA
Nivarox SA
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Priority to EP17178829.2A priority Critical patent/EP3422117B1/de
Priority to JP2018104398A priority patent/JP6655126B2/ja
Priority to US15/997,767 priority patent/US10845763B2/en
Priority to RU2018121493A priority patent/RU2759829C2/ru
Priority to CN201810686914.6A priority patent/CN109212944B/zh
Publication of EP3422117A1 publication Critical patent/EP3422117A1/de
Application granted granted Critical
Publication of EP3422117B1 publication Critical patent/EP3422117B1/de
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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
    • 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
    • G04B31/0087—Jewel bearings with jewel hole only
    • 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
    • G04B31/02—Shock-damping bearings
    • G04B31/04—Shock-damping 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
    • G04B37/00—Cases

Definitions

  • the present invention relates to a shock-absorbing bearing for an axis of a mobile of a timepiece, in particular for a pendulum axis, and comprising a clearance refocusing device.
  • the pivots of the axes of the mobiles rotate in bearings mounted in the plate or in bridges.
  • the bearings it is customary to equip the bearings with a shock absorbing mechanism.
  • the pivots of the axis of a pendulum are generally fine and the mass of the pendulum is relatively high, the pivots can break under the effect of a shock in the absence of a damping mechanism.
  • the configuration of a conventional shock absorbing bearing 1 is represented by the figure 1a .
  • An olive curved stone 2 is driven into a bearing support 3 commonly called a kitten, on which a counter-pivot stone is mounted 4.
  • the kitten 3 is held in abutment against the bottom of a bearing block 5 by a damping spring 6 arranged to exert an axial stress on the upper part of the counter-pivot stone 4.
  • the kitten 3 further comprises a conical outer wall arranged in correspondence with a conical inner wall disposed at the periphery of the bottom of the bearing block 5.
  • the kitten has an external wall having a convex, that is to say curved, surface.
  • the kitten 3 For proper operation, the kitten 3 must be well centered on the axis of the shock absorbing bearing and well flat, which is not easy to guarantee due to the tolerance intervals of the components.
  • the centering position of the kitten 3 on the axis of rotation of the bearing has the drawback of being undefined while in the second configuration, as illustrated by the figure 1c , the kitten 3 can pivot around an axis perpendicular to the axis of the damping bearing, which has the harmful consequence of positioning the kitten 3 at an angle as well as the pivot and the counter-pivot mounted on the kitten.
  • the document EP 3,070,544 discloses a shock-absorbing bearing for a timepiece. It comprises an elastic member comprising an external part adapted to position the elastic member in a housing of the bearing. This outer part is held in the housing by friction generated by elastic forces exerted between said outer part and the wall of the housing. Either a kitten which supports the counter-pivot, or the counter-pivot, comprises a first bearing surface arranged to be in contact with said outer part of the elastic member in the rest position of the bearing.
  • An object of the invention is therefore to propose a shock absorbing bearing for an axis of a mobile of a timepiece, in particular for an axis of a balance wheel, whose tolerance intervals of the components of the shock absorbing bearing do not lead to the two unwanted situations mentioned above.
  • the invention relates to a shock absorbing bearing for an axis of a mobile of a timepiece, in particular for an axis of pendulum.
  • the bearing comprises a bearing block comprising a housing, a bearing support arranged in the housing and comprising an external centering wall, a pivot bearing mounted on the bearing support for receiving a pivot of the axis of a mobile and an arrangement for elastic support of the pivot of the axis of the mobile.
  • the shock-absorbing bearing further comprises a clearance centering device.
  • This clearance centering device comprises, on the one hand, a first part comprising a centering element having an internal centering wall in which the external wall of centering of the bearing support and, on the other hand, a second part bearing on the bearing block and arranged so as to exert a return effect with respect to the first part.
  • This restoring effect allows the centering element of the play centering device to adjust against the bearing support independently of manufacturing variations and to guarantee centering and flat support of the bearing support against the bottom of the block. landing.
  • the outer centering wall of the bearing support and the inner centering wall of the centering element are each a wall of conical shape.
  • the taper of the inner centering wall of the centering element corresponds to the taper of the outer centering wall of the bearing support.
  • the outer centering wall of the bearing support is convex and the inner centering wall of the centering element is conical.
  • the outer centering wall of the bearing support is conical and the inner centering wall of the centering element is convex.
  • the bearing block has an internal wall comprising a cylindrical shoulder having a radial bearing surface as well as an axial bearing surface.
  • the second part of the game refocusing device comprises an annular portion arranged on the radial bearing surface of the shoulder and an elastic portion extending beyond the radial bearing surface in the direction of the bearing axis .
  • the elastic portion comprises several flexible blades arranged along a circular path for example.
  • the flexible blades are configured to flex essentially axially under the effect of a shock as well as to compensate for axial play and ensure the centering of the bearing support.
  • the centering element comprises an external wall comprising several reinforcement blocks and centering, said blocks limiting the radial displacement of the bearing support and allowing, with the rest of the centering element, to compensate for axial play and to ensure the centering of the bearing support.
  • One and the other of the ends of each flexible blade are respectively connected to a corresponding block and to the annular portion of the second part of the game refocusing device.
  • each reinforcement block has a bearing surface arranged against the axial bearing surface of the shoulder making it possible to center the bearing support.
  • Each flexible blade comprises an external side wall set back from the bearing surface of each block.
  • the axis of curvature of the flexible blades of the elastic portion corresponds to the axis of the bearing.
  • the annular portion of the second part of the game refocusing device has a square or rectangular cross section.
  • the annular portion is prestressed (by driving for example) in order to exert a force against a corner formed by the radial bearing surface of the shoulder and an axial bearing surface of the internal wall of the bearing block.
  • the bearing block comprises a base comprising an opening for the passage of the pivot of the axis of a mobile.
  • the bearing support bears against the base of the bearing block.
  • the centering element of the first part of the clearance refocusing device is distant from the base when the shock-absorbing bearing is in a resting configuration, that is to say when the bearing is not under the influence of no external constraints.
  • the game refocusing device is in a monolithic form.
  • a shock absorbing bearing for an axis of a mobile, in particular for a pendulum axis, of a timepiece will now be described according to an embodiment with reference to figures 2 to 5 .
  • the shock absorbing bearing 10 comprises a bearing block 11 (hereinafter: bearing block), a bearing support 20, an elastic member 30 and a clearance refocusing device 40.
  • the outer casing of the bearing block 11 is shaped to be inserted in one or more orifices present on the plate or on one or more bridges of a watch movement (not illustrated).
  • This bearing block 11 comprises a base 12 having an opening 13, preferably cylindrical, for the passage of a pivot of the pendulum axis.
  • the bearing block 11 further comprises an internal side wall defining a housing for receiving the bearing support 20 more commonly known as a kitten.
  • the internal side wall comprises a main cylindrical wall 14a and a first and second complementary cylindrical walls 14b, 14c arranged on either side of the main cylindrical wall 14a, called lower cylindrical walls 14b and upper 14c.
  • each of the lower and upper cylindrical walls 14b, 14c is less than the diameter of the main wall 14a of the internal side wall of the bearing block 11.
  • the lower wall 14b thus forms with the main wall 14a a cylindrical shoulder 16.
  • L 'shoulder 16 forms with the main wall 14a a corner comprising an axial bearing surface 15a and a radial bearing surface 16a extending over 360 ° and centered on the axis of the damping bearing 10.
  • the upper cylindrical wall 14c forms with the main wall 14a a radial bearing surface 15b arranged substantially opposite the radial bearing surface 16a of the shoulder 16.
  • the upper wall 14c forms a flange allowing the attachment of the elastic member 30. It is obvious that other means can be used to fix the elastic member 30 so that the flange formed by the upper wall 14c can be removed, the upper part ieure of the main wall 14a then being straight.
  • the kitten 20 has an internal side wall comprising a main cylindrical wall 21a and a complementary cylindrical wall 21b.
  • the pierced stone 24 is preferably fixed by chasing but can also be glued or fixed in any other way to the main cylindrical wall of the internal kitten wall.
  • the diameter of the main cylindrical wall 21a of the kitten 20 is less than the diameter of the complementary cylindrical wall 21b so as to form a corner extending over 360 °.
  • the elastic support arrangement comprises a pivot 25 mounted on the bearing support 20 and an elastic member 30 arranged to exert an axial force on the bearing support 20.
  • the pivot 25 is cylindrical in shape and is mounted at the above the pierced stone 24. More particularly, the peripheral part of the counter-pivot 25 is held against a radial support surface 22a and axial 22b of the corner of the kitten 20 under the action of the elastic member 30 which is mounted inside the housing of the bearing block 11.
  • the elastic member 30 may have the known form of a lyre and has a lower side 31 whose central part 31a is in abutment against the upper part of the counter-pivot 25 and an upper side 32, the peripheral part 32a of which rests against the radial bearing surface 15b of the bearing block 11.
  • the elastic member 30 is in a prestressing configuration in order to exert an optimal axial force against the counter -pivot 25 when the bearing has mortisor 10 is in a so-called rest configuration in which it is not subjected to any external stress. It will be noted that this elastic member can take different forms and can be coupled to the bearing block 11 by other means. For example, the elastic member may have a shape partially covering the counter-pivot 25.
  • the clearance refocusing device 40 comprises a first part comprising a centering element 42 bearing against the kitten 20 and a second part comprising a peripheral zone bearing on the bearing block 11 as will be described below so that the second part has a reminder effect vis-à-vis the first part.
  • the centering element 42 comprises an internal wall comprising a conical wall 43a and a complementary cylindrical wall 43b as well as an external wall 44 of cylindrical shape.
  • each reinforcing block 45 is arranged on the external wall 44.
  • four blocks 45 are preferably arranged at 90 ° relative to each other.
  • an execution with a different number of blocks can be envisaged, for example three blocks preferably arranged at 120 ° relative to each other.
  • Each block 45 has a bearing surface 45a arranged to bear against the axial bearing surface 16b of the shoulder 16 of the bearing block 11.
  • the second part of the clearance refocusing device 40 comprises an annular portion 46 resting integrally on the radial bearing surface 16a of the shoulder 16 of the bearing block 11 and a second elastic portion extending beyond the surface d radial support 16a in the direction of the axis of the bearing 10 and connected to the centering element 42.
  • the annular portion 46 is of essentially constant cross section and for example of square shape ( figure 2 ).
  • the annular portion 46 is prestressed in order to exert a force against the corner formed by the radial bearing surface 16a of the shoulder 16 and the axial bearing surface 15a of the main cylindrical wall 14a of the bearing block 11 in order to ensure the coupling of the recentering element 42 with the bearing block 11.
  • other forms of coupling can be implemented.
  • the elastic portion of the second part comprises several flexible blades 47 arranged along a path, for example circular, concentric with the centering element 42. These blades 47 are connected to the reinforcement blocks 45 and are configured to flex essentially axially under the effect of a shock as well as to compensate for axial clearances linked in particular to manufacturing variations and to ensure centering and flat support of the kitten 20 at the bottom of the bearing block 11.
  • the elastic portion preferably comprises four flexible blades 47 which each extend along an arc of circle between 60 ° and 85 ° but a different number of blades can be envisaged, for example three blades each extending the along an arc between 90 ° and 115 °.
  • each blade 47 is slightly set back from the bearing surface 45a of each block 45. This makes it possible to prevent the flexible blades 47 from "rubbing" against the axial surface 16b of the shoulder 16 of the bearing block 11 when these blades flex axially in order to absorb the stresses caused by an essentially axial shock, thus preventing premature wear of the blades.
  • the ratio between the axial height of the centering element 42 and the axial height of the annular portion 46 is greater than two according to the embodiment illustrated in the figure 2 whereas this ratio can be approximately equal to one according to an embodiment illustrated in the figure 6 .
  • the external lateral wall 47a of each blade 47 need not be set back from the bearing surface 45a of each block 45.
  • only the lower part of the bearing surface 45a of each block 45 is arranged against the axial bearing surface 16b of the shoulder 16 so that the blades can flex radially above the radial bearing surface 16a of the shoulder 16 by virtue of a clearance situated between the internal lateral wall of the annular portion 46 and the external lateral wall 47a of the flexible blades 47.
  • the dimensions of the flexible blades 47 as well as the material of the clearance refocusing device 40 must be carefully chosen taking into account several considerations. For example, the blades must be able to flex axially enough in particular for the positioning of the elastic member 30 and not to lead to an oversizing of this elastic member. On the other hand, the blades 47 do not also should not be too flexible in order to ensure proper (re) centering of the kitten.
  • the game refocusing device is preferably in the form of a monolithic component.
  • This component can be made either of metal or alloy, or of silicon, or of an elastomeric plastic material.
  • the spring is made of metal, alloy or silicon, its contour can be produced for example by etching, or by photolithography and galvanic growth.
  • a plastic material we will use for example the injection-molding technique
  • the shock-absorbing bearing and its play refocusing device makes it possible to cancel the uncertainty of centering or supporting the kitten, linked to the intolerances of the components, thanks to the active self-centering and catch-up effect.
  • axial play of the game refocusing device thanks to the return effect of the second part of the game refocusing device, the centering element 42 of the game refocusing device according to the invention is returned to the top.
  • the positioning of the internal centering wall of the centering element will adjust against the external conical centering wall of the bearing support at a height dependent on the set of tolerances: if there is little play, the positioning is low, and if there is a lot of play, the positioning is high.
  • the bearing support can be both centered and pressed flat, which is essential for this guide component of the balance.
  • the invention is not limited to the embodiments described with reference to the figures and variants could be envisaged without departing from the scope of the invention.
  • the counter-pivot and the elastic member could be made in one piece.
  • the centering walls of the bearing support and of the centering element of the play centering device are conical in shape, the conicity of the internal wall of centering 43a of the centering element 42 preferably corresponding to the taper of the outer centering wall 23b of the bearing support 20, other profiles of the centering walls could be adapted to perform the centering function.
  • the external centering wall 23b of the bearing support 20 can be convex, the internal centering wall 43a of the centering element 42 being conical, or the external centering wall of the bearing support can be conical, the internal wall centering 43a of the centering member 42 being convex.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Support Of The Bearing (AREA)
  • Vibration Prevention Devices (AREA)

Claims (11)

  1. Shock-Absorberlager (10) für eine Welle eines Drehteils einer Uhr, insbesondere für eine Unruhwelle, umfassend einen Lagerblock (11) mit einem Aufnahmeraum, einen am Boden des Aufnahmeraums angeordneten Lagerträger (20) mit einer äußeren Zentrierwand (23b), ein am Lagerträger (20) montiertes Zapfenlager (24) zur Aufnahme eines Wellenzapfens eines Drehteils, und eine elastische Traganordnung (25) für den Wellenzapfen des Drehteils, wobei das Shock-Absorberlager (10) ferner eine Vorrichtung zur Neuausrichtung des Spiels (40) umfasst, dadurch gekennzeichnet, dass die Vorrichtung zur Neuausrichtung des Spiels (40) einerseits einen ersten Teil, der ein Zentrierelement (42) mit einer inneren Zentrierwand (43a) aufweist, in der die äußere Zentrierwand (23b) des Lagerträgers (20) angeordnet ist, und andererseits einen zweiten Teil umfasst, der sich an dem Lagerblock (11) abstützt und so angeordnet ist, dass er eine Rückstellkraft auf den ersten Teil ausübt, dass der Lagerblock (11) eine Innenwand mit einer zylindrischen Schulter (16) umfasst, die eine radiale Stützfläche (16a) sowie eine axiale Stützfläche (16b) aufweist, und dass der zweite Teil der Vorrichtung zur Neuausrichtung des Spiels (40) einen ringförmigen Abschnitt (46), der auf der radialen Stützfläche (16a) der Schulter (16) angeordnet ist, und einen elastischen Abschnitt, der sich über die radiale Stützfläche (16a) hinaus in Richtung der Lagerwelle erstreckt, umfasst.
  2. Lager nach Anspruch 1, dadurch gekennzeichnet, dass die äußere Zentrierwand (23b) des Lagerträgers (20) und die innere Zentrierwand (43a) des Zentrierelements (42) jeweils eine konische Wand sind, wobei die Konizität der inneren Zentrierwand (43a) des Zentrierelements (42) der Konizität der äußeren Zentrierwand (23b) des Lagerträgers (20) entspricht.
  3. Lager nach Anspruch 1, dadurch gekennzeichnet, dass die äußere Zentrierwand (23b) des Lagerträgers (20) konvex ist und die innere Zentrierwand (43a) des Zentrierelements (42) konisch ist.
  4. Lager nach Anspruch 1, dadurch gekennzeichnet, dass die äußere Zentrierwand (23b) des Lagerträgers (20) konisch ist und die innere Zentrierwand (43a) des Zentrierelements (42) konvex ist.
  5. Lager nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der elastische Abschnitt mehrere flexible Stege (47) aufweist, die entlang einer vorzugsweise kreisförmigen Bahn angeordnet sind, wobei die flexiblen Stege so konfiguriert sind, dass sie sich unter der Wirkung eines Stoßes im Wesentlichen axial biegen, und axiale Spiele ausgleichen und die Zentrierung des Lagerträgers (20) sicherstellen.
  6. Lager nach Anspruch 5, dadurch gekennzeichnet, dass das Zentrierelement (42) eine Außenwand (44) umfasst, die mehrere Verstärkungs- und Zentrierblöcke (45) aufweist, wobei das eine und das andere Ende jedes flexiblen Steges (47) mit einem entsprechenden Block bzw. mit dem ringförmigen Abschnitt (46) des zweiten Teils der Vorrichtung zur Neuausrichtung des Spiels (40) verbunden sind.
  7. Lager nach Anspruch 6, dadurch gekennzeichnet, dass jeder Verstärkungsblock (45) eine Stützfläche (45a) aufweist, die gegen die axiale Stützfläche (16b) der Schulter (16) angeordnet ist, wobei jeder flexible Steg (47) eine äußere Seitenwand (47a) aufweist, die von der Stützfläche jedes Blocks zurückversetzt ist.
  8. Lager nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass die Krümmungsachse der flexiblen Stege (47) des elastischen Abschnitts der Lagerachse entspricht.
  9. Lager nach einem der Ansprüche 4 bis 8, dadurch gekennzeichnet, dass der ringförmige Abschnitt (46) des zweiten Teils der Vorrichtung zur Neuausrichtung des Spiels (40) einen quadratischen oder rechtwinkligen Querschnitt aufweist, wobei der ringförmige Abschnitt vorgespannt ist, um eine Kraft auf eine Ecke auszuüben, die durch die radiale Stützfläche (16a) der Schulter (16) und eine axiale Stützfläche (15a) der Innenwand des Lagerblocks (11) gebildet ist.
  10. Lager nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Lagerblock (11) eine Basis (12) mit einer Öffnung (13) für den Durchgang des Wellenzapfens eines Drehteils aufweist, wobei sich der Lagerträger (20) an der Basis (12) abstützt, und das Zentrierelement (42) des ersten Teils von der Basis (12) beanstandet ist, wenn sich das Lager in einer Ruhekonfiguration befindet.
  11. Uhrwerk, umfassend eine Platine und mindestens eine Brücke, wobei die Platine und/oder die Brücke eine Öffnung aufweisen, in die das Lager nach einem der vorhergehenden Ansprüche eingesetzt ist.
EP17178829.2A 2017-06-29 2017-06-29 Stossdämpfer-gleitlager für eine achse einer drehteil einer uhr Active EP3422117B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP17178829.2A EP3422117B1 (de) 2017-06-29 2017-06-29 Stossdämpfer-gleitlager für eine achse einer drehteil einer uhr
JP2018104398A JP6655126B2 (ja) 2017-06-29 2018-05-31 計時器の車セットのアーバーのためのショックアブソーバーベアリング
US15/997,767 US10845763B2 (en) 2017-06-29 2018-06-05 Shock absorber bearing for an arbor of a timepiece wheel set
RU2018121493A RU2759829C2 (ru) 2017-06-29 2018-06-13 Амортизационная опора для колесной оси часов
CN201810686914.6A CN109212944B (zh) 2017-06-29 2018-06-28 用于钟表轮副的心轴的减震轴承

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17178829.2A EP3422117B1 (de) 2017-06-29 2017-06-29 Stossdämpfer-gleitlager für eine achse einer drehteil einer uhr

Publications (2)

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EP3422117A1 EP3422117A1 (de) 2019-01-02
EP3422117B1 true EP3422117B1 (de) 2020-05-27

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EP17178829.2A Active EP3422117B1 (de) 2017-06-29 2017-06-29 Stossdämpfer-gleitlager für eine achse einer drehteil einer uhr

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US (1) US10845763B2 (de)
EP (1) EP3422117B1 (de)
JP (1) JP6655126B2 (de)
CN (1) CN109212944B (de)
RU (1) RU2759829C2 (de)

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Publication number Priority date Publication date Assignee Title
EP4060427A1 (de) * 2021-03-18 2022-09-21 Patek Philippe SA Genève Stossdämpfer für einen zapfen einer welle einem uhrendrehteils

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Publication number Priority date Publication date Assignee Title
EP2469357A1 (de) * 2010-12-21 2012-06-27 The Swatch Group Research and Development Ltd. Stoßdämpfer-Gleitlager für eine sich drehende Triebfeder einer Uhr
EP3291027A1 (de) * 2016-08-30 2018-03-07 Montres Breguet S.A. Stossdämpfer mit membran

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Publication number Publication date
EP3422117A1 (de) 2019-01-02
JP6655126B2 (ja) 2020-02-26
US20190004480A1 (en) 2019-01-03
CN109212944B (zh) 2021-04-06
RU2759829C2 (ru) 2021-11-18
JP2019012061A (ja) 2019-01-24
US10845763B2 (en) 2020-11-24
RU2018121493A (ru) 2019-12-16
RU2018121493A3 (de) 2021-10-04
CN109212944A (zh) 2019-01-15

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