EP3519902B1 - Achsträgerlager mit reduziertem abrieb - Google Patents

Achsträgerlager mit reduziertem abrieb Download PDF

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Publication number
EP3519902B1
EP3519902B1 EP17808805.0A EP17808805A EP3519902B1 EP 3519902 B1 EP3519902 B1 EP 3519902B1 EP 17808805 A EP17808805 A EP 17808805A EP 3519902 B1 EP3519902 B1 EP 3519902B1
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EP
European Patent Office
Prior art keywords
bearing
axis
sintered
hole
shaft
Prior art date
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Active
Application number
EP17808805.0A
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English (en)
French (fr)
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EP3519902A1 (de
Inventor
Laurent Kaelin
Pascal CHOPARD-LALLIER
Bruno Besutti
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.)
Comadur SA
Original Assignee
Comadur SA
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Publication date
Priority claimed from EP17157667.1A external-priority patent/EP3367182A1/de
Application filed by Comadur SA filed Critical Comadur SA
Publication of EP3519902A1 publication Critical patent/EP3519902A1/de
Application granted granted Critical
Publication of EP3519902B1 publication Critical patent/EP3519902B1/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
    • G04B31/004—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor characterised by the material used
    • G04B31/012—Metallic bearings
    • G04B31/0126—Metallic step-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
    • G04B31/08—Lubrication

Definitions

  • the present invention relates to a micromechanical bearing in which an axis is capable of pivoting, the axis comprising at least one end a bearing via which the axis is in contact with a surface facing the bearing, said bearing being extended by a pivot engaged in a hole in the bearing.
  • a bearing is used in particular in the field of watchmaking.
  • the axis is positioned between two bearings each comprising a hole in which is housed a pivot of the axis.
  • the span of one end of the axis or the span of each end of the axis comes into contact with a surface facing the associated bearing.
  • the two bearings guide the axis in rotation while preventing its axial translation.
  • the documents US 1 642 102 A , CH 311 285 A , CH 284 493 A and JP 2003 156575 A2 are examples of micromechanical bearings in which an axis pivots.
  • the oil layer between the axis span and the surface opposite the bearing is particularly fine so that there is a bonding effect between the bearing surface of the axis and the surface facing the bearing and, when the axis rotates, a shearing force of the oil layer comes oppose the rotation of the axis.
  • the present invention aims to improve the known technique, by proposing a solution for reducing the shear force at the level of the oil layer present between the bearing of an axis and the surface facing a bearing in which the axis is rotated.
  • the present invention relates to a micromechanical bearing according to claim 1.
  • the recess is in the form of a ring centered on the hole in the bearing.
  • the effect that is to say the torque produced by the elementary shear force, is the product of this shear force by the distance between the axis of rotation and the point of application of the elementary force.
  • the surface facing the bearing by which the bearing of the axis is in contact with the bearing is provided with a plurality of recesses distributed around the hole of the bearing. The reduction of the effect of the shear force is thus more homogeneous between the bearing surface of the axis and the surface of the bearing opposite the bearing surface of the axis.
  • the present invention proceeds from the general inventive idea which consists in limiting the contact surface between the bearing of an axis and the facing surface of a bearing holding said axis.
  • the invention proposes a new bearing whose general shape makes it possible to limit said contact surface.
  • the figure 1 schematically shows the implementation of bearings according to the invention for driving in rotation a toothed wheel of a watch movement.
  • the toothed wheel 20 is fixed on an axis 30 comprising at each end a bearing 31a, 31b extended by a pivot 32a, 32b.
  • Axis 30 is rotatably mounted between two bearings 10a, 10b according to the invention.
  • the bearings 10a, 10b preferably of annular shape, are immobilized in a frame 21.
  • These bearings 10a, 10b comprise, in known manner, a hole 11, preferably centered, which passes through them right through. It is noted that the wall of the hole 11 may include an olivage intended to minimize contact with the pivots 32a, 32b and facilitate possible lubrication.
  • a pivot 32a, 32b of the axis 30 guided in rotation by the corresponding bearing 10a or 10b is received in the hole 11.
  • the bearing 31a, 31b of the axis 30 comes into contact with a surface 12 opposite the bearing 10a , 10b, so that the axis 30 is immobilized in axial translation, to within a clearance, between the bearings 10a, 10b.
  • the hole 11 opens into a recess 13 of preferably conical shape.
  • This recess 13 commonly called an oil mill in the watchmaking field, can be intended to receive a drop of oil.
  • the other end of the hole 11 is slightly flared to facilitate the infiltration of the oil between the bearing 10a, 10b and the bearing surface 31a, 31b at the level of the contact surface 12. It will be understood that this recess is optional and that it will only be provided in the case where it is desired to lubricate the pivoting of the axis 30 in the bearing 10a, 10b.
  • a bearing 10a, 10b according to the invention is characterized by a recess 14 making it possible to reduce the contact surface 12 between the bearing surface 31a, 31b of the axis 30 and the bearing 10a, 10b.
  • the recess 14 is produced on the side opposite the recess 13, in the contact surface 12 of the bearing 10a, 10b which is opposite the bearing surface 31a, 31b of the axis 30.
  • the recess 14 has an annular shape.
  • the residual contact surface 12 between the bearing surface 31a, 31b of the axis 30 and the bearing 10a, 10b thus has the form of two concentric inner 12a and outer 12b rings.
  • the interior radius R0 of the inner ring 12a is substantially equal to the radius of the hole 11, while the outer radius R1 of the inner ring 12a is equal to the inner radius of the recess 14.
  • the outer concentric ring 12b it is included between an inner radius R2 equal to the outer diameter of the recess 14, and an outer radius R3.
  • the diameter R1 must be sufficient to guarantee good maintenance of the axis 30 in the hole 11.
  • several recesses 14 are hollowed out on the surface of the bearing 10a, 10b around the hole 11.
  • six recesses 14 are regularly spaced, arranged concentrically around the pivot 32a, 32b of the axis 30 and opening into the flared end of the hole 11.
  • the dimensions of the bearings are small, from less than 1 mm to a few millimeters for the largest dimension.
  • the production of a bearing according to the invention is therefore delicate and requires specific tools.
  • the bearing 10a, 10b is made of a hard monocrystalline material such as ruby, corundum, spinel or else cubic zirconia and the recesses 14 are machined by ablation of material by means of a laser beam, by EDM or grinding.
  • the bearing 10a, 10b is made of a hard sintered material such as corundum, ruby, ceramics, alumina, zirconia or even a hard metal and the recesses 14 are made by stamping or machined by ablation. This technique is described in particular in the document EP 2,778,801 A1 in the name of the Applicant.
  • the process comprises a first step intended to form a ceramic precursor from a ceramic-based powder taken in a binder.
  • This ceramic-based powder can comprise at least one metal oxide, a metal nitride or a metal carbide.
  • the ceramic-based powder may include aluminum oxide to form synthetic sapphire or a mixture of aluminum oxide and chromium oxide to form a synthetic ruby.
  • the binder it can be of the polymer type or of the organic type.
  • the method comprises a second step intended to compress, using an upper matrix and a lower matrix which are brought together, the ceramic precursor in order to form a green body of the future bearing 10a, 10b with upper and lower surfaces respectively comprising at least one recess 14 and, where appropriate, a recess 13. It is therefore understood that each green body thus formed already includes the blanks of the recess 14 and of the recess 13.
  • each substantially planar matrix comprises at least one punch intended to form the recess 14 and, optionally, the recess 13.
  • the upper matrix comprises a punch with a substantially annular surface making it possible to form the recess 14
  • the lower die comprises a punch with a substantially conical surface making it possible to form the recess 13.
  • the green body is sintered in order to form a ceramic bearing 10a, 10b and the hole 11 is drilled in order to connect the upper surface and the lower surface of the bearing 10a, 10b together.
  • This step is preferably carried out using destructive radiation of the laser type in order to obtain very precise etching. However, this step can be carried out for example by mechanical drilling or etching with water at high pressure.
  • the present invention is not limited to the embodiments which have just been described and that various modifications and simple variants can be envisaged by those skilled in the art without departing from the scope of the invention as defined. by the appended claims. It will be noted in particular that in its basic embodiment, the present invention applies to the case in which only one of the two bearings 10a, 10b which guide the axis 30 is provided in its contact surface 12 with the bearing 31a or 31b of the pivot 32a or 32b corresponding to a recess 14 according to the invention. The case in which the two bearings 10a, 10b each have a recess 14 to reduce the extent of the contact surface 12 with the bearing surfaces 31a and 31b of the pivots 32a and 32b is of course also considered.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Sliding-Contact Bearings (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Braking Arrangements (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)

Claims (6)

  1. Mikromechanisches Lager, in dem sich eine Welle (30) dreht, wobei die Welle (30) an mindestens einem Ende eine Lagerfläche (31a, 31b) aufweist, über die die Welle (30) mit einer dem Lager (10a, 10b) zugewandten Fläche (12) in Kontakt steht, wobei die Lagerfläche (31a, 31b) durch einen Drehzapfen (32a, 32b) verlängert ist, der in einem in dem Lager (10a, 10b) ausgebildeten Loch (11) in Eingriff steht, wobei das Lager (10a, 10b) dadurch gekennzeichnet ist, dass in der Kontaktfläche (12) zwischen der Lagerfläche (31a, 31b) der Welle (30) und dem Lager (10a, 10b) mindestens eine Vertiefung (14) ausgebildet ist, um die Kontaktfläche zwischen der Lagerfläche (31a, 31b) der Welle (30) und dem Lager (10a, 10b) zu verringern.
  2. Lager nach Anspruch 1, dadurch gekennzeichnet, dass die Vertiefung (14) die Form eines Rings aufweist, der auf das Loch (11) des Lagers (10a, 10b) zentriert ist.
  3. Lager nach Anspruch 1, dadurch gekennzeichnet, dass die Kontaktfläche (12) zwischen der Lagerfläche (31a, 31b) der Welle (30) und dem Lager (10a, 10b) mit mehreren Vertiefungen (14) versehen ist, die um das Loch (11) des Lagers (10a, 10b) verteilt sind.
  4. Lager nach Anspruch 3, dadurch gekennzeichnet, dass die Vertiefungen (14) gleichmäßig beanstandet und um das Loch (11) des Lagers (10a, 10b) konzentrisch angeordnet sind.
  5. Lager nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass es aus einem monokristallinen Material hergestellt ist, das aus der Gruppe ausgewählt ist, die aus Rubin, Korund, Spinell und kubischem Zirkoniumoxid gebildet ist, wobei die Vertiefung (14) durch Laserstrahlablation, durch Elektroerosion oder durch Schleifen hergestellt ist.
  6. Lager nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass es aus einem gesinterten Material hergestellt ist, das aus der Gruppe gewählt ist, die aus gesintertem Korund, gesintertem Rubin, gesinterten Keramiken, gesintertem Aluminiumoxid, gesintertem Zirkoniumoxid oder einem gesinterten Hartmetall gebildet ist, wobei die Vertiefung (14) durch Einsenken hergestellt oder durch Ablation hergestellt ist.
EP17808805.0A 2016-12-23 2017-11-15 Achsträgerlager mit reduziertem abrieb Active EP3519902B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP16206602 2016-12-23
EP17157471 2017-02-22
EP17157667.1A EP3367182A1 (de) 2017-02-23 2017-02-23 Achsträgerlager mit reduziertem platzbedarf
PCT/EP2017/079302 WO2018114149A1 (fr) 2016-12-23 2017-11-15 Palier support d'axe a frottement reduit

Publications (2)

Publication Number Publication Date
EP3519902A1 EP3519902A1 (de) 2019-08-07
EP3519902B1 true EP3519902B1 (de) 2020-02-05

Family

ID=60574537

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17808805.0A Active EP3519902B1 (de) 2016-12-23 2017-11-15 Achsträgerlager mit reduziertem abrieb

Country Status (7)

Country Link
US (1) US11036186B2 (de)
EP (1) EP3519902B1 (de)
JP (1) JP6901558B2 (de)
KR (1) KR102234880B1 (de)
CN (1) CN110114731B (de)
TW (1) TWI786075B (de)
WO (1) WO2018114149A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3770699A1 (de) * 2019-07-26 2021-01-27 Comadur S.A. Stein, insbesondere für ein uhrwerk, und sein herstellungsverfahren

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1440059A (en) * 1921-09-28 1922-12-26 Colomb Henri Setting for drilled jewel bearings
US1642102A (en) 1924-07-18 1927-09-13 Colomb Henri Jewel setting for watches and method of making same
US2003303A (en) * 1931-11-27 1935-06-04 Neon Res Of Connecticut Inc A process for the catalytic conversion of hydrocarbons
DE832579C (de) 1949-07-25 1952-02-25 Junghans Geb Ag Federnde Lagerung fuer Wellenzapfen in feinmechanischen Getrieben
CH310555A (fr) 1953-09-26 1955-10-31 Marti Fritz Palier pour pivot d'horlogerie.
CH311285A (de) 1953-11-28 1955-11-30 Reinhard Dr Straumann Verfahren zur Herstellung einer Welle mit bruchfesten Lagerzapfen für Uhrwerke und feinmechanische Apparate und nach diesem Verfahren hergestellte Welle mit bruchfesten Lagerzapfen.
CH318238A (fr) * 1954-11-19 1956-12-31 Marti Fritz Palier pour pivot d'horlogerie
US3397531A (en) * 1965-07-01 1968-08-20 Tissot Horlogerie Bearing means for arbor of a watch runner
FR1507516A (fr) * 1966-02-02 1967-12-29 Seiko Instr & Electronics Réserve d'huile de graissage pour un arbre rotatif
US3922041A (en) * 1970-06-25 1975-11-25 Portescap Elastic pivot bearings
US3836213A (en) * 1973-04-02 1974-09-17 Diehl Fa Bearing assembly for precision mechanisms
DE3626784A1 (de) * 1986-08-07 1988-02-18 Werner Stehr Gleitlager fuer feinwerktechnische anwendung
CH702216B1 (fr) * 2000-12-13 2011-05-31 Ebauchesfabrik Eta Ag Procédé de fixation de pierres dans une pièce d'un mouvement d'horlogerie et dispositif pour sa mise en œuvre.
US20020135108A1 (en) * 2001-03-23 2002-09-26 Billiet Romain L. Polycrystalline watch jewels and method of fabrication thereof
JP2003156575A (ja) 2001-08-21 2003-05-30 Citizen Watch Co Ltd 時計部品
JP2008045573A (ja) 2006-08-10 2008-02-28 Nsk Ltd 転がり摺動部材及びその製造方法並びに転動装置
JP2009002436A (ja) 2007-06-21 2009-01-08 Nsk Ltd 転がり摺動部材
JP2009180295A (ja) * 2008-01-30 2009-08-13 Mitsumi Electric Co Ltd 油漏れ防止キャップ
CH704640B1 (fr) * 2008-03-18 2012-09-28 Complitime Sa Organe de pivotement.
JP5526870B2 (ja) * 2009-04-06 2014-06-18 セイコーエプソン株式会社 時計輪列、および時計
JP2012117842A (ja) * 2010-11-29 2012-06-21 Seiko Instruments Inc 時計用軸受構造、ムーブメント、および時計
CH705944A2 (fr) * 2011-12-22 2013-06-28 Swatch Group Res & Dev Ltd Procédé de réalisation d'un composant et composant horloger fabriqué par un tel procédé
EP2778801B1 (de) * 2013-03-11 2019-06-05 Comadur S.A. Lager, das erste und zweite Funktionselemente auf zwei verschiedenen Flächen umfasst
US9678478B2 (en) * 2013-08-16 2017-06-13 University Of Massachusetts Facetted jewel bearings
EP2884348A1 (de) * 2013-12-11 2015-06-17 The Swatch Group Research and Development Ltd. Stoßsicheres System aus zwei verschiedenen Materialien für Uhr
CN104505450A (zh) * 2014-12-22 2015-04-08 常熟史美特节能照明技术有限公司 高光效的无极灯
CH710846B1 (fr) * 2015-03-13 2018-11-15 Swatch Group Res & Dev Ltd Pièce de micromécanique comportant un réservoir tribologique microstructuré pour une substance lubrifiante.

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
EP3519902A1 (de) 2019-08-07
WO2018114149A1 (fr) 2018-06-28
US11036186B2 (en) 2021-06-15
CN110114731B (zh) 2021-04-02
KR102234880B1 (ko) 2021-04-01
TW201830176A (zh) 2018-08-16
CN110114731A (zh) 2019-08-09
JP2019536023A (ja) 2019-12-12
JP6901558B2 (ja) 2021-07-14
TWI786075B (zh) 2022-12-11
US20190258207A1 (en) 2019-08-22
KR20190056443A (ko) 2019-05-24

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