EP3519902B1 - Low-friction shaft support bearing - Google Patents
Low-friction shaft support bearing Download PDFInfo
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- bearing
- axis
- sintered
- hole
- shaft
- 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.)
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Links
- 239000000919 ceramic Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 4
- 238000002679 ablation Methods 0.000 claims description 4
- 229910052593 corundum Inorganic materials 0.000 claims description 4
- 239000010431 corundum Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000010979 ruby Substances 0.000 claims description 4
- 229910001750 ruby Inorganic materials 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 239000010987 cubic zirconia Substances 0.000 claims description 2
- 229910052596 spinel Inorganic materials 0.000 claims description 2
- 239000011029 spinel Substances 0.000 claims description 2
- 238000009760 electrical discharge machining Methods 0.000 claims 1
- 238000003754 machining Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 239000012700 ceramic precursor Substances 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000011009 synthetic ruby Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
-
- 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)
- Braking Arrangements (AREA)
- Storage Of Web-Like Or Filamentary Materials (AREA)
- Mounting Of Bearings Or Others (AREA)
Description
La présente invention concerne un palier de micromécanique dans lequel est susceptible de pivoter un axe, l'axe comprenant à au moins une extrémité une portée via laquelle l'axe est en contact avec une surface en regard du palier, ladite portée étant prolongée par un pivot engagé dans un trou ménagé dans le palier. Un tel palier est notamment utilisé dans le domaine de l'horlogerie.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. Such a bearing is used in particular in the field of watchmaking.
Pour entraîner une roue en rotation dans un mouvement d'horlogerie, il est connu de fixer la roue sur un axe comprenant à au moins une de ses extrémités une portée prolongée par un pivot. L'axe est positionné entre deux paliers comprenant chacun un trou dans lequel est logé un pivot de l'axe. Selon le mode de construction retenu, la portée d'une extrémité de l'axe ou la portée de chaque extrémité de l'axe vient en contact avec une surface en regard du palier associé. Les deux paliers guident l'axe en rotation tout en interdisant sa translation axiale.To drive a rotating wheel in a clockwork movement, it is known to fix the wheel on an axle comprising at 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 of the axis. Depending on the construction method chosen, 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.
Les documents
Pour limiter les frottements entre la portée de l'axe et le palier, il est connu de réaliser une creusure sur un bord extérieur du trou dans lequel est logé le pivot de l'axe de façon à réaliser un réservoir communément appelé huilier et destiné à recevoir une goutte d'huile. La goutte d'huile présente dans le réservoir s'infiltre par capillarité entre l'axe et les parois du trou du palier et entre la portée de l'axe et la surface du palier en regard de ladite portée. Cette technique permet de réduire les frottements entre l'axe et le palier. Toutefois, la couche d'huile entre la portée de l'axe et la surface en regard du palier est particulièrement fine de sorte qu'on constate un effet de collage entre la portée de l'axe et la surface en regard du palier et, lorsque l'axe tourne, une force de cisaillement de la couche d'huile vient s'opposer à la rotation de l'axe. Ces phénomènes parasites se traduisent par une perte d'énergie que l'on cherche à éviter.To limit the friction between the bearing surface of the axle and the bearing, it is known to make a recess on an outside edge of the hole in which the pivot of the axle is housed so as to produce a reservoir commonly called an oil tanker and intended for receive a drop of oil. The drop of oil present in the reservoir infiltrates by capillarity between the axis and the walls of the bearing hole and between the bearing surface of the axis and the surface of the bearing opposite said bearing surface. This technique makes it possible to reduce the friction between the axis and the bearing. However, 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. These parasitic phenomena result in a loss of energy which one seeks to avoid.
La présente invention vise à améliorer la technique connue, en proposant une solution pour réduire la force de cisaillement au niveau de la couche d'huile présente entre la portée d'un axe et la surface en regard d'un palier dans lequel l'axe est pivoté.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.
A cet effet, la présente invention concerne un palier de micromécanique selon la revendication 1.To this end, the present invention relates to a micromechanical bearing according to claim 1.
En réduisant la surface de contact entre la portée de l'axe et le palier, l'effet de la force de cisaillement de la couche d'huile est réduit. L'axe pivote ainsi plus facilement dans le palier. De plus, même réduite, la surface de contact reste suffisante pour guider l'axe dans le palier.By reducing the contact surface between the axle span and the bearing, the effect of the shear force of the oil layer is reduced. The axis thus pivots more easily in the bearing. In addition, even reduced, the contact surface remains sufficient to guide the axis in the bearing.
Selon un mode de réalisation de l'invention, l'évidement se présente sous la forme d'un anneau centré sur le trou du palier. L'effet, c'est-à-dire le couple produit par la force élémentaire de cisaillement, est le produit de cette force de cisaillement par la distance entre l'axe de rotation et le point d'application de la force élémentaire. En réalisant un évidement annulaire éloigné du pivot de l'axe, on réduit ainsi d'autant plus les effets de la force de cisaillement.According to one embodiment of the invention, 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. By making an annular recess distant from the pivot of the axis, the effects of the shear force are all the more reduced.
Selon un autre mode de réalisation de l'invention, la surface en regard du palier par laquelle la portée de l'axe est en contact avec le palier est pourvue d'une pluralité d'évidements répartis autour du trou du palier. La réduction de l'effet de la force de cisaillement est ainsi plus homogène entre la portée de l'axe et la surface du palier en regard de la portée de l'axe.According to another embodiment of the invention, 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.
D'autres caractéristiques et avantages de la présente invention ressortiront plus clairement de la description détaillée qui suit d'exemples de réalisation de paliers selon l'invention. Ces exemples sont donnés à titre purement illustratif et non limitatif et sont à lire en liaison avec les dessins annexés sur lesquels :
- la
figure 1 est une vue d'une roue d'un mouvement horloger montée rotative entre deux paliers selon l'invention ; - la
figure 2 est une vue de dessus d'un palier selon l'invention, et - la
figure 3 est une vue de dessus d'un autre palier selon l'invention.
- the
figure 1 is a view of a watch movement wheel rotatably mounted between two bearings according to the invention; - the
figure 2 is a top view of a bearing according to the invention, and - the
figure 3 is a top view of another bearing according to the invention.
La présente invention procède de l'idée générale inventive qui consiste à limiter la surface de contact entre la portée d'un axe et la surface en regard d'un palier maintenant ledit axe. A cet effet, l'invention propose un nouveau palier dont la forme générale permet de limiter ladite surface de contact.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. To this end, the invention proposes a new bearing whose general shape makes it possible to limit said contact surface.
La
La roue 20 dentée est fixée sur un axe 30 comprenant à chaque extrémité une portée 31a, 31b prolongée par un pivot 32a, 32b. L'axe 30 est monté rotatif entre deux paliers 10a, 10b selon l'invention. Les paliers 10a, 10b, de forme préférentiellement annulaire, sont immobilisés dans un bâti 21. Ces paliers 10a, 10b comprennent, de manière connue, un trou 11, préférentiellement centré, qui les traverse de part en part. On remarque que la paroi du trou 11 peut comprendre un olivage destiné à minimiser le contact avec les pivots 32a, 32b et faciliter une éventuelle lubrification.The
Un pivot 32a, 32b de l'axe 30 guidé en rotation par le palier 10a ou 10b correspondant vient se loger dans le trou 11. La portée 31a, 31b de l'axe 30 vient en contact avec une surface 12 en regard du palier 10a, 10b, de sorte que l'axe 30 est immobilisé en translation axiale, à un jeu près, entre les paliers 10a, 10b.A
Sur une face opposée à la surface de contact 12 entre la portée 31a, 31b de l'axe 30 et le palier 10a, 10b, le trou 11 débouche dans une creusure 13 de forme préférentiellement conique. Cette creusure 13, communément appelée huilier dans le domaine de l'horlogerie, peut être destinée à recevoir une goutte d'huile. L'autre extrémité du trou 11 est légèrement évasée pour faciliter l'infiltration de l'huile entre le palier 10a, 10b et la portée 31a, 31b au niveau de la surface de contact 12. On comprendra que cette creusure est facultative et qu'elle ne sera prévue que dans le cas où l'on souhaite lubrifier le pivotement de l'axe 30 dans le palier 10a,10b.On a face opposite the
Un palier 10a, 10b selon l'invention est caractérisé par un évidement 14 permettant de réduire la surface de contact 12 entre la portée 31a, 31b de l'axe 30 et le palier 10a, 10b. L'évidement 14 est réalisé du côté opposé à la creusure 13, dans la surface de contact 12 du palier 10a, 10b qui se trouve en regard de la portée 31a, 31b de l'axe 30.A
Selon un mode de réalisation illustré à la
Selon un autre mode de réalisation, plusieurs évidements 14 sont creusés à la surface du palier 10a, 10b autour du trou 11. Dans l'exemple représenté sur la
Dans le domaine de l'horlogerie, les dimensions des paliers sont petites, de moins d'1 mm à quelques millimètres pour la dimension la plus grande. La réalisation d'un palier selon l'invention est donc délicate et nécessite un outillage spécifique.In the watchmaking field, 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.
Selon une variante, le palier 10a, 10b est réalisé en un matériau dur monocristallin tel que le rubis, le corindon, le spinelle ou bien encore la zircone cubique et les évidements 14 sont usinés par ablation de matière au moyen d'un faisceau laser, par électroérosion ou par meulage.According to a variant, the bearing 10a, 10b is made of a hard monocrystalline material such as ruby, corundum, spinel or else cubic zirconia and the
Selon une autre variante, le palier 10a, 10b est réalisé en un matériau dur fritté tel que le corindon, le rubis, les céramiques, l'alumine, la zircone ou bien encore un métal dur et les évidements 14 sont réalisés par matriçage ou usinés par ablation. Cette technique est notamment décrite dans le document
Rappelons pour mémoire que le procédé comporte une première étape destinée à former un précurseur céramique à partir d'une poudre à base de céramique prise dans un liant. Cette poudre à base de céramique peut comporter au moins un oxyde métallique, un nitrure métallique ou un carbure métallique. A titre d'exemple, la poudre à base de céramique peut comporter de l'oxyde d'aluminium afin de former du saphir synthétique ou un mélange d'oxyde d'aluminium et d'oxyde de chrome afin de former du rubis synthétique. Quant au liant, il peut être du type polymère ou du type organique.As a reminder, 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. For example, 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. As for the binder, it can be of the polymer type or of the organic type.
Le procédé comporte une deuxième étape destinée à comprimer, à l'aide d'une matrice supérieure et d'une matrice inférieure que l'on rapproche l'une de l'autre, le précurseur céramique afin de former un corps vert du futur palier 10a, 10b avec des surfaces supérieure et inférieure comportant respectivement au moins un évidement 14 et, le cas échéant, une creusure 13. On comprend donc que chaque corps vert ainsi formé comporte déjà les ébauches de l'évidement 14 et de la creusure 13.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
Pour obtenir ces ébauches de l'évidement 14 et de la creusure 13, chaque matrice sensiblement plane comporte au moins un poinçon destiné à former l'évidement 14 et, optionnellement, la creusure 13. A cet effet, la matrice supérieure comporte un poinçon avec une surface sensiblement annulaire permettant de former l'évidement 14, et la matrice inférieure comporte un poinçon avec une surface sensiblement conique permettant de former la creusure 13.To obtain these blanks of the
Finalement, le corps vert est fritté afin de former un palier 10a, 10b en céramique et l'on perce le trou 11 afin de relier entre elles la surface supérieure et la surface inférieure du palier 10a, 10b. Cette étape est préférentiellement réalisée à l'aide d'un rayonnement destructif du type laser afin d'obtenir une gravure très précise. Toutefois, cette étape peut être effectuée par exemple par perçage mécanique ou gravure avec de l'eau à haute pression.Finally, the green body is sintered in order to form a
Il va de soi que la présente invention n'est pas limitée aux modes de réalisation qui viennent d'être décrits et que diverses modifications et variantes simples peuvent être envisagées par l'homme du métier sans sortir du cadre de l'invention tel que défini par les revendications annexées. On notera en particulier que dans son mode de réalisation de base, la présente invention s'applique au cas dans lequel un seul des deux paliers 10a, 10b qui guident l'axe 30 est muni dans sa surface de contact 12 avec la portée 31a ou 31b du pivot 32a ou 32b correspondant d'un évidement 14 conforme à l'invention. Le cas dans lequel les deux paliers 10a, 10b présentent chacun un évidement 14 pour réduire l'étendue de la surface de contact 12 avec les portées 31a et 31b des pivots 32a et 32b est bien entendu également considéré.It goes without saying that 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
- 10a, 10b.10a, 10b.
- Paliersbearings
- 11.11.
- TrouHole
- 12.12.
- Surface de contactContact surface
- 12a.12a.
- Anneau concentrique intérieurInner concentric ring
- 12b.12b.
- Anneau concentrique extérieurConcentric outer ring
- R0, R2.R0, R2.
- Rayons intérieursInterior shelves
- R1, R3.R1, R3.
- Rayons extérieursOuter shelves
- 13.13.
- Creusurehollow
- 14.14.
- Evidementsrecesses
- 20.20.
- RoueWheel
- 21.21.
- Bâtibuilt
- 30.30.
- AxeAxis
- 31a, 31b.31a, 31b.
- Portées de l'axeAxis spans
- 32a, 32b.32a, 32b.
- Pivots de l'axeAxis pivots
Claims (6)
- Bearing for micromechanics, in which pivots a shaft (30), the shaft (30) comprising, at at least one end thereof, a shoulder (31a, 31b) via which the shaft (30) is in contact with an opposite surface (12) of the bearing (10a, 10b), the shoulder (31a, 31b) being extended by a pivot (32a, 32b) engaged in a hole (11) provided in the bearing (10a, 10b), the bearing (10a, 10b) being characterised in that at least one hollow (14) is arranged in the contact surface (12) between the shoulder (31a, 31b) of the shaft (30) and the bearing (10a, 10b) in order to reduce the surface of contact between the shoulder (31a, 31b) of the shaft (30) and the bearing (10a, 10b).
- Bearing according to claim 1, characterised in that the hollow (14) is present in the form of a ring centred around the hole (11) of the bearing (10a, 10b).
- Bearing according to claim 1, characterised in that the surface of contact (12) between the shoulder (31a, 31 b) of the shaft (30) and the bearing (10a, 10b) is provided with a plurality of hollows (14) distributed around the hole (11) of the bearing (10a, 10b).
- Bearing according to claim 3, characterised in that the hollows (14) are evenly spaced apart and arranged in a concentric manner around the hole (11) of the bearing (10a, 10b).
- Bearing according to one of claims 1 to 4, characterised in that it is made from a monocrystalline material chosen from the group containing ruby, corundum, spinel or cubic zirconia, the hollow (14) being machined by material ablation using a laser beam, by spark erosion or by grinding.
- Bearing according to one of claims 1 to 4, characterised in that it is made from a sintered material chosen from the group containing sintered corundum, sintered ruby, sintered ceramics, sintered alumina, sintered zirconia or a sintered hard metal, the hollow (14) being made by forming or by ablation machining.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP16206602 | 2016-12-23 | ||
| EP17157471 | 2017-02-22 | ||
| EP17157667.1A EP3367182A1 (en) | 2017-02-23 | 2017-02-23 | Low-friction shaft support bearing |
| PCT/EP2017/079302 WO2018114149A1 (en) | 2016-12-23 | 2017-11-15 | Reduced-friction shaft support bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3519902A1 EP3519902A1 (en) | 2019-08-07 |
| EP3519902B1 true EP3519902B1 (en) | 2020-02-05 |
Family
ID=60574537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17808805.0A Active EP3519902B1 (en) | 2016-12-23 | 2017-11-15 | Low-friction shaft support bearing |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US11036186B2 (en) |
| EP (1) | EP3519902B1 (en) |
| JP (1) | JP6901558B2 (en) |
| KR (1) | KR102234880B1 (en) |
| CN (1) | CN110114731B (en) |
| TW (1) | TWI786075B (en) |
| WO (1) | WO2018114149A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3770699A1 (en) * | 2019-07-26 | 2021-01-27 | Comadur S.A. | Stone, particularly for clock movement, and method for manufacturing same |
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| US1440059A (en) * | 1921-09-28 | 1922-12-26 | Colomb Henri | Setting for drilled jewel bearings |
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| US2003303A (en) * | 1931-11-27 | 1935-06-04 | Neon Res Of Connecticut Inc | A process for the catalytic conversion of hydrocarbons |
| DE832579C (en) * | 1949-07-25 | 1952-02-25 | Junghans Geb Ag | Spring-loaded bearing for shaft journals in precision mechanical gears |
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| CH318238A (en) * | 1954-11-19 | 1956-12-31 | Marti Fritz | Bearing for watch pivot |
| US3397531A (en) * | 1965-07-01 | 1968-08-20 | Tissot Horlogerie | Bearing means for arbor of a watch runner |
| FR1507516A (en) * | 1966-02-02 | 1967-12-29 | Seiko Instr & Electronics | Lubricating oil reserve for a rotating shaft |
| 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 (en) * | 1986-08-07 | 1988-02-18 | Werner Stehr | Sliding bearing for use in precision engineering |
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| US20020135108A1 (en) * | 2001-03-23 | 2002-09-26 | Billiet Romain L. | Polycrystalline watch jewels and method of fabrication thereof |
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| JP2009002436A (en) | 2007-06-21 | 2009-01-08 | Nsk Ltd | Rolling slide member |
| JP2009180295A (en) * | 2008-01-30 | 2009-08-13 | Mitsumi Electric Co Ltd | Oil-leakage preventing cap |
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- 2017-11-15 EP EP17808805.0A patent/EP3519902B1/en active Active
- 2017-11-15 JP JP2019524233A patent/JP6901558B2/en active Active
- 2017-11-15 WO PCT/EP2017/079302 patent/WO2018114149A1/en unknown
- 2017-11-15 CN CN201780079616.4A patent/CN110114731B/en active Active
- 2017-11-15 KR KR1020197012887A patent/KR102234880B1/en active IP Right Grant
- 2017-11-15 US US16/344,237 patent/US11036186B2/en active Active
- 2017-11-27 TW TW106141127A patent/TWI786075B/en active
Non-Patent Citations (1)
| Title |
|---|
| None * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6901558B2 (en) | 2021-07-14 |
| US11036186B2 (en) | 2021-06-15 |
| KR102234880B1 (en) | 2021-04-01 |
| WO2018114149A1 (en) | 2018-06-28 |
| EP3519902A1 (en) | 2019-08-07 |
| CN110114731B (en) | 2021-04-02 |
| KR20190056443A (en) | 2019-05-24 |
| US20190258207A1 (en) | 2019-08-22 |
| JP2019536023A (en) | 2019-12-12 |
| TWI786075B (en) | 2022-12-11 |
| CN110114731A (en) | 2019-08-09 |
| TW201830176A (en) | 2018-08-16 |
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