EP3367182A1 - Achsträgerlager mit reduziertem platzbedarf - Google Patents

Achsträgerlager mit reduziertem platzbedarf Download PDF

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Publication number
EP3367182A1
EP3367182A1 EP17157667.1A EP17157667A EP3367182A1 EP 3367182 A1 EP3367182 A1 EP 3367182A1 EP 17157667 A EP17157667 A EP 17157667A EP 3367182 A1 EP3367182 A1 EP 3367182A1
Authority
EP
European Patent Office
Prior art keywords
bearing
axis
recess
hole
sintered
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.)
Withdrawn
Application number
EP17157667.1A
Other languages
English (en)
French (fr)
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Comadur SA filed Critical Comadur SA
Priority to EP17157667.1A priority Critical patent/EP3367182A1/de
Priority to JP2019524233A priority patent/JP6901558B2/ja
Priority to US16/344,237 priority patent/US11036186B2/en
Priority to CN201780079616.4A priority patent/CN110114731B/zh
Priority to EP17808805.0A priority patent/EP3519902B1/de
Priority to PCT/EP2017/079302 priority patent/WO2018114149A1/fr
Priority to KR1020197012887A priority patent/KR102234880B1/ko
Priority to TW106141127A priority patent/TWI786075B/zh
Publication of EP3367182A1 publication Critical patent/EP3367182A1/de
Withdrawn legal-status Critical Current

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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
    • G04B31/008—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

Definitions

  • the present invention relates to a bearing in which is pivotable an axis, the axis comprising at least one end a reach through 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 landing.
  • a bearing is particularly used in the field of watchmaking.
  • the wheel To drive a wheel in rotation in a clockwork movement, it is known to fix the wheel on an axis comprising at least one of its ends a range extended by a pivot.
  • the axis is positioned between two bearings each comprising a hole in which is housed a pivot axis. According to the chosen construction method, the range of one end of the axis or the range of each end of the axis comes into contact with a surface facing the associated bearing. Both bearings guide the axis in rotation while prohibiting its axial translation.
  • the oil layer between the axis of the axis and the surface facing the bearing is particularly thin so that there is an effect bonding between the scope of the axis and the surface facing the bearing and, when the axis rotates, a shearing force of the oil layer comes to oppose the rotation of the axis.
  • the present invention aims at improving the known technique, by proposing a solution for reducing the shearing force at the level of the oil layer present between the bearing of an axis and the surface opposite a bearing in which the axis is rotated.
  • the present invention relates to a bearing in which an axis rotates, the axis comprising at one end a bearing surface through which the pin is in contact with a surface facing the bearing, said bearing being extended by a pivot engaged in a hole in the bearing, the bearing surface facing the axis of the bearing including at least one recess to reduce the contact area between the bearing axis and the bearing.
  • the recess is in the form of a ring centered on the bearing hole.
  • the effect ie the torque produced by the elementary shear force, is the product of this shearing force by the distance between the axis of rotation and the point of application of the elementary force.
  • the surface opposite the bearing by which the bearing surface 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 shearing force is thus more homogeneous between the bearing of the axis and the surface of the bearing opposite the span of the axis.
  • the present invention proceeds from the general inventive idea of limiting the contact surface between the range of an axis and the surface facing a bearing maintaining said axis.
  • the invention proposes a new bearing whose general shape limits said contact surface.
  • the figure 1 shows schematically the implementation of bearings according to the invention for driving in rotation of 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.
  • the axis 30 is rotatably mounted between two bearings 10a, 10b according to the invention.
  • the bearings 10a, 10b are immobilized in a frame 21.
  • These bearings 10a, 10b comprise, in a known manner, a hole 11, preferably centered, which passes right through them. Note that the wall of the hole 11 may include an olivage 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 bearing 10a or 10b corresponding is housed in the hole 11.
  • the bearing 31a, 31b of the axis 30 comes into contact with a surface 12 facing the bearing 10a, 10b, so that the axis 30 is immobilized in axial translation, with a game near, between the bearings 10a, 10b.
  • the hole 11 opens into a recess 13 of preferentially conical shape.
  • This hollow 13, commonly called oiler in the field of watchmaking, may 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 31a, 31b at the contact surface 12. It will be understood that this recess is optional and that it will be provided only 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 for reducing the contact surface 12 between the bearing 31a, 31b of the axis 30 and the bearing 10a, 10b.
  • the recess 14 is made on the opposite side to 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 shape of two concentric inner 12a and outer 12b rings.
  • the inner 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 radius Inside the recess 14.
  • the outer concentric ring 12b it is 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 ensure proper maintenance of the axis 30 in the hole 11.
  • a plurality of recesses 14 are hollowed on the surface of the bearing 10a, 10b around the hole 11.
  • six recesses 14 are evenly 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 monocrystalline hard 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 electroerosion or by 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 Claimant.
  • the process includes a first step for forming a ceramic precursor from a ceramic-based powder taken in a binder.
  • This ceramic-based powder may comprise at least one metal oxide, a metal nitride or a metal carbide.
  • the ceramic powder may comprise aluminum oxide to form synthetic sapphire or a mixture of aluminum oxide and chromium oxide to form 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, with the aid of an upper die and a lower die which is brought closer to one another, the ceramic precursor 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 comprises the blanks of the recess 14 and 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 die comprises a punch with a substantially annular surface for forming the recess 14
  • the lower die comprises a punch with a substantially conical surface for forming the recess 13.
  • the green body is sintered to form a ceramic bearing 10a, 10b and the hole 11 is drilled 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 a very precise etching. However, this step can be performed for example by mechanical drilling or etching with high pressure water.
  • 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 surface 31a. or 31b of 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 for reducing 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)
EP17157667.1A 2016-12-23 2017-02-23 Achsträgerlager mit reduziertem platzbedarf Withdrawn EP3367182A1 (de)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP17157667.1A EP3367182A1 (de) 2017-02-23 2017-02-23 Achsträgerlager mit reduziertem platzbedarf
JP2019524233A JP6901558B2 (ja) 2016-12-23 2017-11-15 摩擦を小さくした軸支持ベアリング
US16/344,237 US11036186B2 (en) 2016-12-23 2017-11-15 Reduced-friction shaft support bearing
CN201780079616.4A CN110114731B (zh) 2016-12-23 2017-11-15 降低了摩擦的轴支撑轴承
EP17808805.0A EP3519902B1 (de) 2016-12-23 2017-11-15 Achsträgerlager mit reduziertem abrieb
PCT/EP2017/079302 WO2018114149A1 (fr) 2016-12-23 2017-11-15 Palier support d'axe a frottement reduit
KR1020197012887A KR102234880B1 (ko) 2016-12-23 2017-11-15 마찰 저감된 샤프트 지지 베어링
TW106141127A TWI786075B (zh) 2016-12-23 2017-11-27 減少磨擦力的桿支撐軸承

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17157667.1A EP3367182A1 (de) 2017-02-23 2017-02-23 Achsträgerlager mit reduziertem platzbedarf

Publications (1)

Publication Number Publication Date
EP3367182A1 true EP3367182A1 (de) 2018-08-29

Family

ID=58264365

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17157667.1A Withdrawn EP3367182A1 (de) 2016-12-23 2017-02-23 Achsträgerlager mit reduziertem platzbedarf

Country Status (1)

Country Link
EP (1) EP3367182A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3770698A1 (de) * 2019-07-26 2021-01-27 Comadur S.A. Mineralstein vom monokristallinen typ mit einem kegel zur neuzentrierung eines zapfens, und sein herstellungsverfahren
EP3770699A1 (de) * 2019-07-26 2021-01-27 Comadur S.A. Stein, insbesondere für ein uhrwerk, und sein herstellungsverfahren
US20210170629A1 (en) * 2019-12-10 2021-06-10 Comadur Sa Jewel, in particular for an horological movement, and manufacturing method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1642102A (en) * 1924-07-18 1927-09-13 Colomb Henri Jewel setting for watches and method of making same
CH284493A (de) * 1949-07-25 1952-07-31 Junghans Geb Ag Federndes Lager für Wellenzapfen in feinmechanischen Getrieben.
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.
JP2003156575A (ja) * 2001-08-21 2003-05-30 Citizen Watch Co Ltd 時計部品
EP2778801A1 (de) 2013-03-11 2014-09-17 Comadur S.A. Lager, das erste und zweite Funktionselemente auf zwei verschiedenen Flächen umfasst
CH710846A2 (fr) * 2015-03-13 2016-09-15 Swatch Group Res & Dev Ltd Pièce de micromécanique comportant un réservoir tribologique micro-structuré pour une substance lubrifiante.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1642102A (en) * 1924-07-18 1927-09-13 Colomb Henri Jewel setting for watches and method of making same
CH284493A (de) * 1949-07-25 1952-07-31 Junghans Geb Ag Federndes Lager für Wellenzapfen in feinmechanischen Getrieben.
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.
JP2003156575A (ja) * 2001-08-21 2003-05-30 Citizen Watch Co Ltd 時計部品
EP2778801A1 (de) 2013-03-11 2014-09-17 Comadur S.A. Lager, das erste und zweite Funktionselemente auf zwei verschiedenen Flächen umfasst
CH710846A2 (fr) * 2015-03-13 2016-09-15 Swatch Group Res & Dev Ltd Pièce de micromécanique comportant un réservoir tribologique micro-structuré pour une substance lubrifiante.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3770698A1 (de) * 2019-07-26 2021-01-27 Comadur S.A. Mineralstein vom monokristallinen typ mit einem kegel zur neuzentrierung eines zapfens, und sein herstellungsverfahren
EP3770699A1 (de) * 2019-07-26 2021-01-27 Comadur S.A. Stein, insbesondere für ein uhrwerk, und sein herstellungsverfahren
WO2021018464A1 (fr) * 2019-07-26 2021-02-04 Comadur Sa Pierre, notamment pour un mouvement d'horlogerie, et son procede de fabrication
WO2021018491A1 (fr) * 2019-07-26 2021-02-04 Comadur Sa Pierre minerale de type monocristalline munie d'un cone de recentrage d'un pivot, et son procede de fabrication
CN114269509A (zh) * 2019-07-26 2022-04-01 柯马杜股份有限公司 设有用于使枢转件重新对中的锥体的单晶矿物宝石及其制造方法
CN114340831A (zh) * 2019-07-26 2022-04-12 科马杜尔公司 尤其用于时计机芯的石材及其制造方法
JP7429284B2 (ja) 2019-07-26 2024-02-07 コマディール・エス アー ピボットを中心に配置させる円錐部を備える単結晶型の鉱石、及びその製造方法
US20210170629A1 (en) * 2019-12-10 2021-06-10 Comadur Sa Jewel, in particular for an horological movement, and manufacturing method thereof

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