EP2605083B1 - Overmoulded timepiece journal bearing - Google Patents

Overmoulded timepiece journal bearing Download PDF

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Publication number
EP2605083B1
EP2605083B1 EP11194060.7A EP11194060A EP2605083B1 EP 2605083 B1 EP2605083 B1 EP 2605083B1 EP 11194060 A EP11194060 A EP 11194060A EP 2605083 B1 EP2605083 B1 EP 2605083B1
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EP
European Patent Office
Prior art keywords
revolution
cage
core
cavity
bearing
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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Application number
EP11194060.7A
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German (de)
French (fr)
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EP2605083A1 (en
Inventor
Laurent Kaelin
Julien Moulin
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ETA SA Manufacture Horlogere Suisse
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ETA SA Manufacture Horlogere Suisse
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.)
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Publication date
Application filed by ETA SA Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to EP11194060.7A priority Critical patent/EP2605083B1/en
Priority to EP12194356.7A priority patent/EP2605084B1/en
Priority to JP2012269006A priority patent/JP2013127458A/en
Priority to US13/710,831 priority patent/US20130155823A1/en
Priority to CN2012105408376A priority patent/CN103163773A/en
Priority to RU2012154333/28A priority patent/RU2012154333A/en
Publication of EP2605083A1 publication Critical patent/EP2605083A1/en
Application granted granted Critical
Publication of EP2605083B1 publication Critical patent/EP2605083B1/en
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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
    • 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
    • G04B31/016—Plastic 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
    • 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
    • G04B31/06—Manufacture or mounting processes

Definitions

  • the invention relates to an overmoulded clock bearing, comprising a plastic core injected into a cavity of revolution that comprises an outer cage, and comprising at least one inner cage contained in said cavity, said plastic core being injected between said inner cage and said outer cage and defined by an outer surface of revolution that includes said inner cage and an inner surface of revolution that includes said outer cage, said outer surface of revolution and / or said inner surface of revolution having at least one groove or a shoulder of revolution for the immobilization of said core in the direction of an axis of revolution common to said outer surface of revolution and said inner surface of revolution.
  • the invention also relates to a watch movement comprising at least one such smooth bearing.
  • the invention also relates to a timepiece comprising at least one such smooth bearing.
  • the invention also relates to a method for manufacturing a molded overmolded sliding bearing.
  • the invention relates to the field of watchmaking, and more particularly the field of guides and bearings.
  • Bearing lubrication is a difficult area that requires care, and maintenance in service.
  • the document CH 559 383 B5 in the name of PORTESCAP illustrates a shock absorber bearing for a watch, with a core which is an elastic part, without play between the different concentric cages that this bearing comprises.
  • the document FR 1 579 777 A in the name of FRATELLI BORLETTI describes a watch pendulum pivot with a plastic disk serving as counter-stone for supporting the rounded end of a pendulum.
  • This disc is housed in a cavity of a seat bearing an annular stone.
  • This counter-stone disc can be injection molded.
  • PORTESCAP describes a bearing for clockwork mobile pivot, close to the document FR 1 587 976 A above, with a modified background shape.
  • the invention proposes to circumvent these problems of the prior art, by proposing cheaper bearings, with a reduced number of components, little sensitive to shocks, and not requiring any particular adjustment during their assembly.
  • the invention relates to a overmolded overmolded clock bearing, comprising a plastic core injected into a cavity of revolution that comprises an outer cage that comprises said bearing, and comprising at least one inner cage contained in said cavity, said plastic core being injected between said inner cage and said outer cage and delimited by an outer surface of revolution that includes said inner cage and by an inner surface of revolution that includes said outer cage, said outer surface of revolution and / or said internal surface of revolution comprising at least one groove or a shoulder of revolution for the immobilization of said core in the direction of an axis of revolution common to said outer surface of revolution and to said inner surface of revolution, characterized in that said surface outer of revolution and said inner surface re revolution each comprise at least one groove or a shoulder of revolution for the immobilization of said core in the direction of said axis of revolution.
  • the constituent plastic material of said core has a shrinkage coefficient of between 2.0% and 3.0% which determines the functional clearance of said plain bearing between said inner race and said core on the one hand, and between said outer cage and said core on the other hand.
  • said sliding bearing consists exclusively of said inner race, said core, and said outer race.
  • a plurality of inner cages having contact surfaces of revolution coaxial with each other and with said cavity around a same axis of revolution, said inner cages being threaded one in the other and separated, said cavity for the outermost of them, and two by two for the others, each time by a plastic core injected into a chamber delimited by the internal volume of the outermost cage , and by the outer volume of the innermost cage.
  • the invention also relates to a watch movement comprising at least one such smooth bearing.
  • the invention also relates to a timepiece comprising at least one such smooth bearing.
  • said injection or casting chamber is defined by an outer surface of revolution that comprises said inner cage and by an inner surface of revolution that comprises said cage outside, and by the addition of closure surfaces associated with said cavity and said inner cage respectively bordering said inner surface of revolution and said outer surface of revolution, and, after complete removal of said plastic material, is moved away said closing surfaces.
  • the invention relates to the field of watchmaking, and more particularly the field of guides and bearings.
  • the invention more particularly relates to a sliding bearing 1 overmoulded clock.
  • this sliding bearing 1 comprises a core 5 of plastic material injected into a cavity 4 of revolution that comprises an outer cage 3.
  • An example of a sliding bearing which does not form part of the invention is visible on the figure 1 .
  • the plastic material has a slight shrinkage, which is sufficient to ensure the functional clearance required for smooth bearing operation.
  • the core 5 has a homothetic geometry to that of the cavity 4, the removal of the plastic being regular, the geometry of the core 5 is as good as that of the cavity 4. It is therefore necessary, for optimal operation, to ensure the very good circularity of the cavity 4, the respect of the dimension is however insignificant since the adjustment is done by the injection or casting process, preferably injection.
  • the plain bearing 1 further comprises an inner cage 2 contained in the cavity 4. And the plastic core 5 is then injected between the inner cage 2 and the outer cage 3.
  • the core 5 is delimited by an outer surface of revolution 20 that comprises the inner cage 2 and by an inner surface of revolution 30 that includes the outer cage 3.
  • this outer surface of revolution 20 and this inner surface of revolution 30 are coaxial about the same axis of revolution D.
  • the core 5 is entirely of revolution, as regards its contact surfaces with the outer cage 3, and with the inner cage 2 when it exists.
  • the outer surface of revolution 20 and / or said inner surface of revolution 30 comprises at least one groove 6 or a shoulder 7 of revolution for the immobilization of the core 5 in the direction of an axis of revolution D common to the outer surface of revolution 20 and to the inner surface of revolution 30.
  • both the outer surface of revolution 20 and the inner surface of revolution 30 each comprise at least one such groove 6 or such a shoulder 7 of revolution for the immobilization of the core (5) in the direction of the axis of revolution D, as visible in the figures.
  • the outer surface of revolution 20 and the inner surface of revolution 30 comprise, at least one groove, and the other at least one shoulder, or conversely, this at least one groove and the at least one shoulder being of revolution and for the immobilization of the core 5 in the direction of the axis of revolution D.
  • the constituent plastic material of the core 5 has a shrinkage coefficient of between 2.0% and 3.0% which determines the functional clearance of the sliding bearing 1 between the inner cage 2 and the core 5 on the one hand, and between the outer cage 3 and the core 5 on the other.
  • the Figures 3 and 4 illustrate the shrinkage R after complete polymerization of the plastic material.
  • the axial and radial play of the bearing 1 is defined by the shrinkage rate and the geometry of the bearing.
  • a 2.5% shrinkage of the walls of 0.4mm corresponds to a frost of 0.010 mm which is perfectly suited to the usual watch applications. This frolic comes from the process itself, and is guaranteed from one room to another.
  • the sliding bearing 1 consists exclusively of the inner cage 2, the core 5, and the outer cage 3.
  • the invention also relates to a clockwork movement comprising at least one such smooth bearing 1.
  • the invention also relates to a timepiece 100 comprising at least one such smooth bearing 1 and / or such a movement 10.
  • the invention also relates to a method for manufacturing a molded overmolded smooth bearing 1 according to claim 8.
  • an injection or casting chamber 40 is defined by the addition of closure surfaces 11, 12 related to the cavity 4, thus forming a mold, as visible in FIG. figure 6 . And then the injection or casting of plastic is carried out in the chamber 40 to produce a core 5 delimited by the cavity 4 and these closing surfaces 11, 12. After complete removal of the plastic material, these closing surfaces are removed. .
  • the cavity 4 is inserted in revolution and coaxially with the outer cage 3 according to FIG. axis of revolution D, an inner race 2 which is intended to be incorporated in the sliding bearing 1.
  • the injection or casting chamber 40 is delimited by an outer surface of revolution 20 that the inner race 2 comprises and by an inner surface of revolution 30 that includes the outer cage 3.
  • the injection or casting chamber 40 is delimited by an outer surface of revolution 20 that comprises the inner cage 2 and by an inner surface of revolution 30 which the outer cage 3, and by the addition of closure surfaces associated with the cavity 4 and the inner cage 2 respectively bordering the inner surface of revolution 30 and the outer surface of revolution 20. And, after complete removal of the plastic material, the closing surfaces are moved away.
  • the invention still relates to any type of overmoulded plain bearing 1 comprising an outer cage 3 with a cavity 4 of revolution about an axis of revolution D, in which cavity 4 are positioned a plurality of inner cages 2 having revolution contact around the axis of revolution D.
  • These revolution contact surfaces are coaxial with each other and with the cavity 4, and the inner cages 2 are threaded into one another.
  • the inner cages 2 are separated, from the cavity 4 for the outermost of them, and two by two for the others, each time by a core 5 made of plastic material injected into a chamber delimited by the internal volume of the cage the outermost, and by the outer volume of the innermost cage.
  • the chambers, in which the plastic is injected to form the cores are further delimited by closure surfaces, for example substantially perpendicular to the axis D.
  • the figure 8 illustrates an example of such a bearing 1 having an outer cage 3, separated from an inner inner cage 2A by a first core 5A.
  • the intermediate cage 2A is separated from an axial inner cage 2B by a second core 5B.
  • the withdrawal R of the core 5A, 5B ensures the functional clearance between the cages separated by the core concerned.
  • the sliding bearing can be handled in one piece without loss of components.
  • This bearing has no problem of impact resistance, because of the manufacture of the plastic core.
  • the adjustment of the game is intrinsic since it comes from the withdrawal of the plastic material during its final polymerization.
  • Tightening tolerances of tight fitting depend on narrow manufacturing tolerances, so it is possible to substantially reduce the functional clearance. Indeed, it is not required particular precision, in diameter or in the axial direction, of the outer cage, and, as the case of the inner cage, since the plastic material occupies all the available volume during its injection or its casting. The injection or the casting thus compensates for all the tolerances, and the frolics remain perfectly correct.
  • the partition that is to say the height of the outer cage relative to the inner cage, is perfectly controlled and centered.
  • the control and centering are given by the symmetrical shrinkage of the plastic, and, when executed with a mold and closing surfaces, by the bearing surface in the mold to align the two cages.
  • the preferred embodiment by injection ensures good control of the process and its perfect reproducibility.
  • the injection allows the creation of the core, the adjustment of the frost during the withdrawal, and the assembly of the bearing, which is unmountable after injection, when one of the cages, inner or outer, has a groove or a shoulder limiting movement in the axial direction.
  • plastics have tribological qualities well suited to this application. More particularly, the use of the POM is satisfactory.
  • the plastic material used may be composite, and incorporate slip improving compounds, such as lubricant, PTFE, "Delrin®”, “Rilsan®”, “Nylon®”, or similar bubbles.
  • plastic material is chosen with a coefficient of friction between 0.07 and 0.15 The use of materials with lower coefficients of friction is also possible, despite their higher cost.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Sliding-Contact Bearings (AREA)

Description

Domaine de l'inventionField of the invention

L'invention concerne un palier lisse d'horlogerie surmoulé, comportant un noyau en matière plastique injecté dans une cavité de révolution que comporte une cage extérieure, et comportant au moins une cage intérieure contenue dans ladite cavité, ledit noyau en matière plastique étant injecté entre ladite cage intérieure et ladite cage extérieure et délimité par une surface extérieure de révolution que comporte ladite cage intérieure et par une surface intérieure de révolution que comporte ladite cage extérieure, ladite surface extérieure de révolution ou/et ladite surface intérieure de révolution comportant au moins une gorge ou un épaulement de révolution pour l'immobilisation dudit noyau dans la direction d'un axe de révolution commun à ladite surface extérieure de révolution et à ladite surface intérieure de révolution.The invention relates to an overmoulded clock bearing, comprising a plastic core injected into a cavity of revolution that comprises an outer cage, and comprising at least one inner cage contained in said cavity, said plastic core being injected between said inner cage and said outer cage and defined by an outer surface of revolution that includes said inner cage and an inner surface of revolution that includes said outer cage, said outer surface of revolution and / or said inner surface of revolution having at least one groove or a shoulder of revolution for the immobilization of said core in the direction of an axis of revolution common to said outer surface of revolution and said inner surface of revolution.

L'invention concerne encore un mouvement d'horlogerie comportant au moins un tel palier lisse.The invention also relates to a watch movement comprising at least one such smooth bearing.

L'invention concerne encore une pièce d'horlogerie comportant au moins un tel palier lisse.The invention also relates to a timepiece comprising at least one such smooth bearing.

L'invention concerne encore un procédé de fabrication d'un palier lisse d'horlogerie surmoulé.The invention also relates to a method for manufacturing a molded overmolded sliding bearing.

L'invention concerne le domaine de l'horlogerie, et plus particulièrement le domaine des guidages et des paliers.The invention relates to the field of watchmaking, and more particularly the field of guides and bearings.

Arrière-plan de l'inventionBackground of the invention

On connaît essentiellement deux types de paliers horlogers :

  • les roulements à billes comportent un grand nombre de composants, et il est nécessaire de régler leur ébat lors du montage ;
  • les paliers lisses sont de réalisation coûteuse en raison de la précision recherchée, leur tenue aux chocs est médiocre quand ils comportent une pierre, le réglage de l'ébat est également nécessaire.
Two types of watch bearings are essentially known:
  • the ball bearings have a large number of components, and it is necessary to adjust their frolics during assembly;
  • the plain bearings are expensive because of the desired accuracy, their impact resistance is poor when they include a stone, the setting of the frolicking is also necessary.

Dans un cas comme dans l'autre, les composants associés à ces paliers doivent être réalisés avec un niveau de précision élevé.In either case, the components associated with these bearings must be made with a high level of precision.

La lubrification des paliers est un domaine difficile qui nécessite du soin, et une maintenance en service.Bearing lubrication is a difficult area that requires care, and maintenance in service.

Le document CH 559 383 B5 au nom de PORTESCAP illustre un palier amortisseur de chocs pour montre, avec un noyau qui est une partie élastique, sans jeu entre les différentes cages concentriques que comporte ce palier.The document CH 559 383 B5 in the name of PORTESCAP illustrates a shock absorber bearing for a watch, with a core which is an elastic part, without play between the different concentric cages that this bearing comprises.

Le document FR 1 579 777 A au nom de FRATELLI BORLETTI décrit un pivot de balancier d'horlogerie avec un disque en matière plastique servant de contre-pierre d'appui de l'extrémité arrondie d'un balancier. Ce disque est logé dans une cavité d'un siège portant une pierre annulaire. Ce disque contre-pierre peut être moulé par injection.The document FR 1 579 777 A in the name of FRATELLI BORLETTI describes a watch pendulum pivot with a plastic disk serving as counter-stone for supporting the rounded end of a pendulum. This disc is housed in a cavity of a seat bearing an annular stone. This counter-stone disc can be injection molded.

Le document FR 1 587 976 A au nom de KURUCZ ET MATTHEY décrit un palier amortisseur de chocs d'horlogerie avec un palier massif en matière plastique logé dans une creusure centrale, de façon analogue à CH 559 383 B5 cité plus haut. Lors du retrait de la matière plastique, la matière se resserre autour d'une nervure et assure l'assemblage sans jeu du corps de palier dans son support.The document FR 1 587 976 A in the name of KURUCZ AND MATTHEY describes a watch shock absorber bearing with a massive plastic bearing housed in a central recess, similarly to CH 559 383 B5 cited above. During the removal of the plastic material, the material is tightened around a rib and assures the assembly without play of the bearing body in its support.

Le document US 2 956 394 A au nom de DUBOIS (TISSOT), présente un palier surmoulé pour montre. Comme dans le document FR 1 587 976 A ci-dessus, la forme de coin conique fixe fortement l'élément moulé lors du refroidissement.The document US 2,956,394 A in the name of DUBOIS (TISSOT), presents an overmolded bearing for a watch. As in the document FR 1 587 976 A above, the conical wedge shape strongly fixes the molded element during cooling.

Le document CH 583 934 B5, PORTESCAP décrit un palier pour pivot de mobile d'horlogerie, proche du document FR 1 587 976 A ci-dessus, avec une forme de fond modifiée.The document CH 583 934 B5, PORTESCAP describes a bearing for clockwork mobile pivot, close to the document FR 1 587 976 A above, with a modified background shape.

Résumé de l'inventionSummary of the invention

L'invention se propose de contourner ces problèmes de l'art antérieur, en proposant des paliers moins coûteux, à nombre de composants réduit, peu sensibles aux chocs, et ne nécessitant pas de réglage particulier lors de leur montage.The invention proposes to circumvent these problems of the prior art, by proposing cheaper bearings, with a reduced number of components, little sensitive to shocks, and not requiring any particular adjustment during their assembly.

A cet effet, l'invention concerne un palier lisse d'horlogerie surmoulé, comportant un noyau en matière plastique injecté dans une cavité de révolution que comporte une cage extérieure que comporte ledit palier, et comportant au moins une cage intérieure contenue dans ladite cavité, ledit noyau en matière plastique étant injecté entre ladite cage intérieure et ladite cage extérieure et délimité par une surface extérieure de révolution que comporte ladite cage intérieure et par une surface intérieure de révolution que comporte ladite cage extérieure, ladite surface extérieure de révolution ou/et ladite surface intérieure de révolution comportant au moins une gorge ou un épaulement de révolution pour l'immobilisation dudit noyau dans la direction d'un axe de révolution commun à ladite surface extérieure de révolution et à ladite surface intérieure de révolution, caractérisé en ce que ladite surface extérieure de révolution et ladite surface intérieure de révolution comportent chacune au moins une gorge ou un épaulement de révolution pour l'immobilisation dudit noyau dans la direction dudit axe de révolution.For this purpose, the invention relates to a overmolded overmolded clock bearing, comprising a plastic core injected into a cavity of revolution that comprises an outer cage that comprises said bearing, and comprising at least one inner cage contained in said cavity, said plastic core being injected between said inner cage and said outer cage and delimited by an outer surface of revolution that includes said inner cage and by an inner surface of revolution that includes said outer cage, said outer surface of revolution and / or said internal surface of revolution comprising at least one groove or a shoulder of revolution for the immobilization of said core in the direction of an axis of revolution common to said outer surface of revolution and to said inner surface of revolution, characterized in that said surface outer of revolution and said inner surface re revolution each comprise at least one groove or a shoulder of revolution for the immobilization of said core in the direction of said axis of revolution.

Selon une caractéristique de l'invention, la matière plastique constitutive dudit noyau a un coefficient de retrait compris entre 2,0% et 3,0% qui détermine le jeu fonctionnel dudit palier lisse entre ladite cage intérieure et ledit noyau d'une part, et entre ladite cage extérieure et ledit noyau d'autre part.According to one characteristic of the invention, the constituent plastic material of said core has a shrinkage coefficient of between 2.0% and 3.0% which determines the functional clearance of said plain bearing between said inner race and said core on the one hand, and between said outer cage and said core on the other hand.

Selon une caractéristique de l'invention, ledit palier lisse est constitué exclusivement de ladite cage intérieure, dudit noyau, et de ladite cage extérieure.According to one characteristic of the invention, said sliding bearing consists exclusively of said inner race, said core, and said outer race.

Selon une caractéristique de l'invention, dans ladite cavité sont positionnées une pluralité de cages intérieures comportant des surfaces de contact de révolution coaxiales entre elles et avec ladite cavité autour d'un même axe de révolution, lesdites cages intérieures étant enfilées l'une dans l'autre et séparées, de ladite cavité pour la plus externe d'entre elles, et deux à deux pour les autres, à chaque fois par un noyau en matière plastique injecté dans une chambre délimitée par le volume intérieur de la cage la plus externe, et par le volume extérieur de la cage la plus interne.According to a characteristic of the invention, in said cavity are positioned a plurality of inner cages having contact surfaces of revolution coaxial with each other and with said cavity around a same axis of revolution, said inner cages being threaded one in the other and separated, said cavity for the outermost of them, and two by two for the others, each time by a plastic core injected into a chamber delimited by the internal volume of the outermost cage , and by the outer volume of the innermost cage.

L'invention concerne encore un mouvement d'horlogerie comportant au moins un tel palier lisse.The invention also relates to a watch movement comprising at least one such smooth bearing.

L'invention concerne encore une pièce d'horlogerie comportant au moins un tel palier lisse.The invention also relates to a timepiece comprising at least one such smooth bearing.

L'invention concerne encore un procédé de fabrication d'un palier lisse d'horlogerie surmoulé, caractérisé en ce que l'on effectue les étapes suivantes :

  • on prépare une cage extérieure qui est destinée à être incorporée audit palier lisse et qui comporte une cavité de révolution autour d'un axe de révolution, ladite cavité comportant une surface intérieure de révolution comportant au moins une gorge ou un épaulement de révolution dans la direction dudit axe de révolution;
  • on insère dans ladite cavité de révolution, et coaxialement à ladite cage extérieure selon ledit axe de révolution, une cage intérieure qui est destinée à être incorporée audit palier lisse et qui comporte une surface extérieure de révolution autour dudit axe ladite surface extérieure de révolution comportant au moins une gorge ou un épaulement de révolution dans la direction dudit axe de révolution;
  • on délimite une chambre d'injection ou de coulée par ladite surface extérieure de révolution et par ladite surface intérieure de révolution;
  • on effectue une injection ou une coulée de matière plastique dans ladite chambre pour réaliser un noyau délimité par ladite cavité;
  • on assure les conditions d'un retrait thermique ou cristallin de ladite matière plastique pour limiter ledit retrait à une fourchette de 2,0% à 3,0% ;
  • on attend le retrait complet de ladite matière plastique avant d'utiliser ledit palier lisse.
The invention also relates to a method for manufacturing a molded overmolded watch bearing, characterized in that the following steps are carried out:
  • an outer cage is prepared which is intended to be incorporated in said smooth bearing and which comprises a cavity of revolution about an axis of revolution, said cavity comprising an inner surface of revolution comprising at least one groove or a shoulder of revolution in the direction said axis of revolution;
  • said inner cavity, which is intended to be incorporated in said smooth bearing, and which has an outer surface of revolution about said axis, said outer surface of revolution comprising at least one outer surface of revolution, is inserted into said revolution cavity and coaxially to said outer race along said axis of revolution; minus a groove or a shoulder of revolution in the direction of said axis of revolution;
  • an injection or casting chamber is defined by said outer surface of revolution and by said inner surface of revolution;
  • injection or casting of plastic material in said chamber to achieve a core defined by said cavity;
  • providing conditions for thermal or crystalline shrinkage of said plastic material to limit said shrinkage to a range of 2.0% to 3.0%;
  • the complete removal of said plastic material is expected before using said plain bearing.

Selon une caractéristique de l'invention, avant d'effectuer ladite injection ou ladite coulée :

  • on délimite, autour de ladite cavité de révolution, une chambre d'injection ou de coulée, par l'adjonction de surfaces de fermeture connexes à ladite cavité, et
  • on effectue ladite injection ou coulée de matière plastique dans ladite chambre pour réaliser un noyau délimité par ladite cavité et lesdites surfaces de fermeture;
  • après retrait complet de ladite matière plastique, on éloigne lesdites surfaces de fermeture.
According to a characteristic of the invention, before carrying out said injection or said casting:
  • there is defined, around said cavity of revolution, an injection or casting chamber, by the addition of closure surfaces connected to said cavity, and
  • said injection or casting of plastics material into said chamber to provide a core defined by said cavity and said closure surfaces;
  • after complete removal of said plastic material, said closure surfaces are moved away.

Selon une caractéristique de l'invention, avant d'effectuer ladite injection ou ladite coulée, on délimite ladite chambre d'injection ou de coulée par une surface extérieure de révolution que comporte ladite cage intérieure et par une surface intérieure de révolution que comporte ladite cage extérieure, et par l'adjonction de surfaces de fermeture connexes à ladite cavité et à ladite cage intérieure en bordure respectivement de ladite une surface intérieure de révolution et de ladite surface extérieure de révolution, et, après retrait complet de ladite matière plastique, on éloigne lesdites surfaces de fermeture.According to a characteristic of the invention, before carrying out said injection or said casting, said injection or casting chamber is defined by an outer surface of revolution that comprises said inner cage and by an inner surface of revolution that comprises said cage outside, and by the addition of closure surfaces associated with said cavity and said inner cage respectively bordering said inner surface of revolution and said outer surface of revolution, and, after complete removal of said plastic material, is moved away said closing surfaces.

Description sommaire des dessinsBrief description of the drawings

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui va suivre, en référence aux dessins annexés où :

  • la figure 1 représente, de façon schématisée et en coupe dans un plan passant par un axe de révolution, un palier lisse, dans un premier exemple avec un noyau plastique moulé dans une cage extérieure, lors de l'injection ou de la coulée de la matière plastique constituant ce noyau;
  • la figure 2 représente, de façon similaire à la figure 1, un premier mode de réalisation de l'invention, avec un noyau plastique moulé entre une cage intérieure et une cage extérieure lors de l'injection ou de la coulée de la matière plastique constituant ce noyau;
  • la figure 3 représente, de façon similaire à la figure 2, un premier mode de réalisation de l'invention, après retrait de la matière plastique constituant ce noyau plastique ;
  • la figure 4 représente, de façon similaire à la figure 3, un premier mode de réalisation de invention, après retrait de la matière plastique constituant ce noyau plastique, et dans une autre variante de réalisation;
  • la figure 5 représente, de façon schématisée, une vue de dessus et une coupe similaire aux figures précédentes, d'un palier lisse selon l'invention réalisé sans moule ;
  • la figure 6 représente, de façon schématisée, une vue de dessus et deux coupes similaires aux figures 1 à 4, d'un palier lisse selon l'invention réalisé avec un moule comportant des canaux d'injection ou de coulée visibles sur la vue de dessus et l'une des deux coupes :
  • la figure 7 représente, sous forme d'un schéma-blocs, une pièce d'horlogerie comportant un mouvement comportant un palier lisse selon l'invention.
Other features and advantages of the invention will appear on reading the detailed description which follows, with reference to the appended drawings in which:
  • the figure 1 represents, schematically and in section in a plane passing through an axis of revolution, a sliding bearing, in a first example with a plastic core molded in an outer cage, during the injection or casting of the plastic material constituting this nucleus;
  • the figure 2 represents, similarly to the figure 1 , a first embodiment of the invention, with a plastic core molded between a cage and an outer cage during the injection or casting of the plastic material constituting the core;
  • the figure 3 represents, similarly to the figure 2 , a first embodiment of the invention, after removal of the plastic material constituting the plastic core;
  • the figure 4 represents, similarly to the figure 3 , a first embodiment of the invention, after removal of the plastic material constituting this plastic core, and in another variant embodiment;
  • the figure 5 shows, schematically, a top view and a section similar to the previous figures, of a sliding bearing according to the invention made without mold;
  • the figure 6 schematically represents a view from above and two sections similar to Figures 1 to 4 , a sliding bearing according to the invention made with a mold having injection or casting channels visible in the top view and one of two sections:
  • the figure 7 represents, in the form of a block diagram, a timepiece comprising a movement comprising a sliding bearing according to the invention.

Description détaillée des modes de réalisation préférésDetailed Description of the Preferred Embodiments

L'invention concerne le domaine de l'horlogerie, et plus particulièrement le domaine des guidages et des paliers.The invention relates to the field of watchmaking, and more particularly the field of guides and bearings.

L'invention concerne plus particulièrement un palier lisse 1 d'horlogerie surmoulé.The invention more particularly relates to a sliding bearing 1 overmoulded clock.

Selon l'invention, ce palier lisse 1 comporte un noyau 5 en matière plastique injecté dans une cavité 4 de révolution que comporte une cage extérieure 3. Un exemple de palier lisse qui ne fait pas partie de l'invention est visible sur la figure 1. Après polymérisation complète, la matière plastique a un léger retrait, qui est suffisant pour assurer le jeu fonctionnel nécessaire au bon fonctionnement du palier lisse. Comme le noyau 5 a une géométrie homothétique à celle de la cavité 4, le retrait de la matière plastique étant régulier, la géométrie du noyau 5 est aussi bonne que celle de la cavité 4. Il convient donc, pour un fonctionnement optimal, de s'assurer de la très bonne circularité de cette cavité 4, le respect de la cote étant en revanche peu important puisque l'ajustement se fait par le procédé d'injection ou de coulée, préférentiellement d'injection.According to the invention, this sliding bearing 1 comprises a core 5 of plastic material injected into a cavity 4 of revolution that comprises an outer cage 3. An example of a sliding bearing which does not form part of the invention is visible on the figure 1 . After complete polymerization, the plastic material has a slight shrinkage, which is sufficient to ensure the functional clearance required for smooth bearing operation. As the core 5 has a homothetic geometry to that of the cavity 4, the removal of the plastic being regular, the geometry of the core 5 is as good as that of the cavity 4. It is therefore necessary, for optimal operation, to ensure the very good circularity of the cavity 4, the respect of the dimension is however insignificant since the adjustment is done by the injection or casting process, preferably injection.

Selon une exécution préférée visible sur les figures 2 à 6, dans un premier mode de réalisation, le palier lisse 1 comporte encore une cage intérieure 2 contenue dans la cavité 4. Et le noyau 5 en matière plastique est alors injecté entre la cage intérieure 2 et la cage extérieure 3.According to a preferred embodiment visible on the Figures 2 to 6 in a first embodiment, the plain bearing 1 further comprises an inner cage 2 contained in the cavity 4. And the plastic core 5 is then injected between the inner cage 2 and the outer cage 3.

De façon préférée, le noyau 5 est délimité par une surface extérieure de révolution 20 que comporte la cage intérieure 2 et par une surface intérieure de révolution 30 que comporte la cage extérieure 3.Preferably, the core 5 is delimited by an outer surface of revolution 20 that comprises the inner cage 2 and by an inner surface of revolution 30 that includes the outer cage 3.

De préférence, cette surface extérieure de révolution 20 et cette surface intérieure de révolution 30 sont coaxiales autour d'un même axe de révolution D.Preferably, this outer surface of revolution 20 and this inner surface of revolution 30 are coaxial about the same axis of revolution D.

Ainsi, dans une réalisation préférée, le noyau 5 est entièrement de révolution, en ce qui concerne ses surfaces de contact avec la cage extérieure 3, et avec la cage intérieure 2 quand elle existe.Thus, in a preferred embodiment, the core 5 is entirely of revolution, as regards its contact surfaces with the outer cage 3, and with the inner cage 2 when it exists.

De façon préférée et particulièrement avantageuse, la surface extérieure de révolution 20 ou/et ladite surface intérieure de révolution 30 comporte au moins une gorge 6 ou un épaulement 7 de révolution pour l'immobilisation du noyau 5 dans la direction d'un axe de révolution D commun à la surface extérieure de révolution 20 et à la surface intérieure de révolution 30.In a preferred and particularly advantageous manner, the outer surface of revolution 20 and / or said inner surface of revolution 30 comprises at least one groove 6 or a shoulder 7 of revolution for the immobilization of the core 5 in the direction of an axis of revolution D common to the outer surface of revolution 20 and to the inner surface of revolution 30.

Et, si possible, à la fois la surface extérieure de révolution 20 et la surface intérieure de révolution 30 comportent chacune au moins une telle gorge 6 ou un tel épaulement 7 de révolution pour l'immobilisation du noyau (5) dans la direction de l'axe de révolution D, tel que visible sur les figures.And, if possible, both the outer surface of revolution 20 and the inner surface of revolution 30 each comprise at least one such groove 6 or such a shoulder 7 of revolution for the immobilization of the core (5) in the direction of the axis of revolution D, as visible in the figures.

Dans une réalisation particulière visible à la figure 4, la surface extérieure de révolution 20 et la surface intérieure de révolution 30 comportent, l'une au moins une gorge, et l'autre au moins un épaulement, ou inversement, cette au moins une gorge et cet au moins un épaulement étant de révolution et pour l'immobilisation du noyau 5 dans la direction de l'axe de révolution D.In a particular embodiment visible to the figure 4 , the outer surface of revolution 20 and the inner surface of revolution 30 comprise, at least one groove, and the other at least one shoulder, or conversely, this at least one groove and the at least one shoulder being of revolution and for the immobilization of the core 5 in the direction of the axis of revolution D.

Le choix de la matière plastique est important. De préférence, la matière plastique constitutive du noyau 5 a un coefficient de retrait compris entre 2,0% et 3,0% qui détermine le jeu fonctionnel du palier lisse 1 entre la cage intérieure 2 et le noyau 5 d'une part, et entre la cage extérieure 3 et le noyau 5 d'autre part.The choice of plastic is important. Preferably, the constituent plastic material of the core 5 has a shrinkage coefficient of between 2.0% and 3.0% which determines the functional clearance of the sliding bearing 1 between the inner cage 2 and the core 5 on the one hand, and between the outer cage 3 and the core 5 on the other.

Ce retrait thermique ou cristallin, selon la matière utilisée, conditionne ainsi le jeu de palier.This thermal or crystalline shrinkage, depending on the material used, thus conditions the bearing clearance.

Les figures 3 et 4 illustrent le retrait R après polymérisation complète de la matière plastique. Le jeu axial et radial du palier 1 est défini par le taux de retrait et par la géométrie du palier. Par exemple, dans le cas de la figure 3, un retrait de 2,5% des parois de 0,4mm, correspond à un ébat de 0,010 mm qui convient parfaitement aux applications horlogères usuelles. Cet ébat vient du process lui-même, et est ainsi garanti d'une pièce à l'autre.The Figures 3 and 4 illustrate the shrinkage R after complete polymerization of the plastic material. The axial and radial play of the bearing 1 is defined by the shrinkage rate and the geometry of the bearing. For example, in the case of figure 3 , a 2.5% shrinkage of the walls of 0.4mm, corresponds to a frost of 0.010 mm which is perfectly suited to the usual watch applications. This frolic comes from the process itself, and is guaranteed from one room to another.

Dans une application préférée, le palier lisse 1 selon l'invention est constitué exclusivement de la cage intérieure 2, du noyau 5, et de la cage extérieure 3.In a preferred application, the sliding bearing 1 according to the invention consists exclusively of the inner cage 2, the core 5, and the outer cage 3.

L'invention concerne encore un mouvement d'horlogerie10 comportant au moins un tel palier lisse 1.The invention also relates to a clockwork movement comprising at least one such smooth bearing 1.

L'invention concerne encore une pièce d'horlogerie 100 comportant au moins un tel palier lisse 1 ou/et un tel mouvement 10.The invention also relates to a timepiece 100 comprising at least one such smooth bearing 1 and / or such a movement 10.

L'invention concerne encore un procédé de fabrication d'un palier lisse 1 d'horlogerie surmoulé, selon la revendication 8.The invention also relates to a method for manufacturing a molded overmolded smooth bearing 1 according to claim 8.

Selon une mise en oeuvre particulière, avant d'effectuer l'injection ou la coulée, on délimite, autour de la cavité 4 de révolution, une chambre d'injection ou de coulée 40, par l'adjonction de surfaces de fermeture 11, 12 connexes à la cavité 4, formant ainsi un moule, tel que visible à la figure 6. Et on effectue alors l'injection ou la coulée de matière plastique dans la chambre 40 pour réaliser un noyau 5 délimité par la cavité 4 et ces surfaces de fermeture 11, 12. Après retrait complet de la matière plastique, on éloigne ces surfaces de fermeture.According to one particular embodiment, before injection or casting, around the cavity 4 of revolution, an injection or casting chamber 40 is defined by the addition of closure surfaces 11, 12 related to the cavity 4, thus forming a mold, as visible in FIG. figure 6 . And then the injection or casting of plastic is carried out in the chamber 40 to produce a core 5 delimited by the cavity 4 and these closing surfaces 11, 12. After complete removal of the plastic material, these closing surfaces are removed. .

Selon la mise en oeuvre particulière, pour l'obtention d'un palier lisse 1 à trois composants, avant d'effectuer l'injection ou la coulée, on insère dans la cavité 4 de révolution, et coaxialement à la cage extérieure 3 selon l'axe de révolution D, une cage intérieure 2 qui est destinée à être incorporée au palier lisse 1. On délimite la chambre d'injection ou de coulée 40 par une surface extérieure de révolution 20 que comporte la cage intérieure 2 et par une surface intérieure de révolution 30 que comporte la cage extérieure 3.According to the particular implementation, in order to obtain a three-component plain bearing 1, before injection or casting, the cavity 4 is inserted in revolution and coaxially with the outer cage 3 according to FIG. axis of revolution D, an inner race 2 which is intended to be incorporated in the sliding bearing 1. The injection or casting chamber 40 is delimited by an outer surface of revolution 20 that the inner race 2 comprises and by an inner surface of revolution 30 that includes the outer cage 3.

De façon particulière, avant d'effectuer l'injection ou la coulée, on délimite la chambre d'injection ou de coulée 40 par une surface extérieure de révolution 20 que comporte la cage intérieure 2 et par une surface intérieure de révolution 30 que comporte la cage extérieure 3, et par l'adjonction de surfaces de fermeture connexes à la cavité 4 et à la cage intérieure 2 en bordure respectivement de la surface intérieure de révolution 30 et de la surface extérieure de révolution 20. Et, après retrait complet de la matière plastique, on éloigne les surfaces de fermeture.In particular, before making the injection or casting, the injection or casting chamber 40 is delimited by an outer surface of revolution 20 that comprises the inner cage 2 and by an inner surface of revolution 30 which the outer cage 3, and by the addition of closure surfaces associated with the cavity 4 and the inner cage 2 respectively bordering the inner surface of revolution 30 and the outer surface of revolution 20. And, after complete removal of the plastic material, the closing surfaces are moved away.

Naturellement, si l'invention est décrite ici dans l'application préférée, car la plus économique, à un noyau unique, on comprend qu'elle peut très facilement être étendue à une fabrication de type gigogne de mobiles pivotant les uns dans les autres, par exemple des chaussées de minutes et d'heures et une cheminée de guidage recevant ces chaussées. L'application à un simple palier lisse n'est donc nullement restrictive, et l'invention doit être comprise comme étant applicable à tout type de guidage en pivotement axial. La limitation de course axiale par l'utilisation de gorges ou d'épaulements est très utile dans la fabrication de mobiles complexes indémontables.Naturally, if the invention is described here in the preferred application, because the most economical, to a single core, it is understood that it can very easily be extended to a trolley-like manufacturing of mobile pivoting into each other, for example pavements of minutes and hours and a guide chimney receiving these roads. The application to a simple plain bearing is therefore in no way restrictive, and the invention must be understood as being applicable to all types of guidance in axial pivoting. The limitation of axial stroke by the use of grooves or shoulders is very useful in the manufacture of indemovable complex mobiles.

Aussi, l'invention concerne encore tout type de palier lisse surmoulé 1 comportant une cage extérieure 3 avec une cavité 4 de révolution autour d'un axe de révolution D, dans laquelle cavité 4 sont positionnées une pluralité de cages intérieures 2 comportant des surfaces de contact de révolution autour de l'axe de révolution D. Ces surfaces de contact de révolution sont coaxiales entre elles et avec la cavité 4, et les cages intérieures 2 sont enfilées l'une dans l'autre. Les cages intérieures 2 sont séparées, de la cavité 4 pour la plus externe d'entre elles, et deux à deux pour les autres, à chaque fois par un noyau 5 en matière plastique injecté dans une chambre délimitée par le volume intérieur de la cage la plus externe, et par le volume extérieur de la cage la plus interne. De préférence, les chambres, dans lesquelles on effectue l'injection de la matière plastique pour constituer les noyaux, sont encore délimitées par des surfaces de fermeture, par exemple sensiblement perpendiculaires à l'axe D.Also, the invention still relates to any type of overmoulded plain bearing 1 comprising an outer cage 3 with a cavity 4 of revolution about an axis of revolution D, in which cavity 4 are positioned a plurality of inner cages 2 having revolution contact around the axis of revolution D. These revolution contact surfaces are coaxial with each other and with the cavity 4, and the inner cages 2 are threaded into one another. The inner cages 2 are separated, from the cavity 4 for the outermost of them, and two by two for the others, each time by a core 5 made of plastic material injected into a chamber delimited by the internal volume of the cage the outermost, and by the outer volume of the innermost cage. Preferably, the chambers, in which the plastic is injected to form the cores, are further delimited by closure surfaces, for example substantially perpendicular to the axis D.

La figure 8 illustre un exemple d'un tel palier 1 comportant une cage extérieure 3, séparé d'une cage intérieure intermédiaire 2A par un premier noyau 5A. La cage intermédiaire 2A est séparée d'une cage intérieure axiale 2B par un deuxième noyau 5B. A chaque fois, le retrait R du noyau 5A, 5B, assure le jeu fonctionnel entre les cages séparées par le noyau concerné.The figure 8 illustrates an example of such a bearing 1 having an outer cage 3, separated from an inner inner cage 2A by a first core 5A. The intermediate cage 2A is separated from an axial inner cage 2B by a second core 5B. In each case, the withdrawal R of the core 5A, 5B ensures the functional clearance between the cages separated by the core concerned.

Grâce à l'invention, de nombreuses caractéristiques sont améliorées par rapport aux paliers de l'art antérieur.Thanks to the invention, many features are improved over the bearings of the prior art.

Aucun montage par chassage, soudage, vissage, rivetage, ou similaire, n'est nécessaire.No mounting by driving, welding, screwing, riveting, or the like is necessary.

Dans la variante préférée où l'une des cages intérieure ou extérieure comporte l'une des gorges ou un épaulement, le palier lisse peut être manipulé d'un seul tenant sans perte de composants.In the preferred embodiment where one of the inner or outer cages has one of the grooves or a shoulder, the sliding bearing can be handled in one piece without loss of components.

Ce palier ne présente aucun problème de tenue chocs, en raison de la fabrication du noyau en matière plastique.This bearing has no problem of impact resistance, because of the manufacture of the plastic core.

Le réglage du jeu est intrinsèque, puisqu'il provient du retrait de la matière plastique lors de sa polymérisation finale.The adjustment of the game is intrinsic since it comes from the withdrawal of the plastic material during its final polymerization.

On s'affranchit des problèmes de tolérances d'ajustement serrées dépendant de tolérances de fabrication étroites, il est donc possible de diminuer sensiblement le jeu fonctionnel. En effet, il n'est pas requis de précision particulière, en diamètre ou selon la direction axiale, de la cage extérieure, et, selon le cas de la cage intérieure, puisque la matière plastique vient occuper tout le volume disponible lors de son injection ou de sa coulée. L'injection ou la coulée compense ainsi toutes les tolérances, et les ébats restent parfaitement corrects.Tightening tolerances of tight fitting depend on narrow manufacturing tolerances, so it is possible to substantially reduce the functional clearance. Indeed, it is not required particular precision, in diameter or in the axial direction, of the outer cage, and, as the case of the inner cage, since the plastic material occupies all the available volume during its injection or its casting. The injection or the casting thus compensates for all the tolerances, and the frolics remain perfectly correct.

La diminution du nombre de composants réduit le coût.Decreasing the number of components reduces the cost.

Le risque qualité est réduit également, car on évite un réglage d'ébat fastidieux.The risk of quality is reduced as well, because it avoids a fastidious frolicking.

Le partagement, c'est-à-dire la hauteur de la cage extérieure par rapport à la cage intérieure, est parfaitement maîtrisé et centré. La maîtrise et le centrage sont donnés par le retrait symétrique du plastique, et, en cas d'exécution avec un moule et des surfaces de fermeture, par la surface d'appui dans le moule pour aligner les deux cages.The partition, that is to say the height of the outer cage relative to the inner cage, is perfectly controlled and centered. The control and centering are given by the symmetrical shrinkage of the plastic, and, when executed with a mold and closing surfaces, by the bearing surface in the mold to align the two cages.

Il est possible de prévenir toute ovalisation du noyau, et donc tout décentrage, par l'emploi de plusieurs canaux d'injection ou de coulée, tel que visible sur la figure 6.It is possible to prevent any ovalisation of the core, and therefore any decentering, by the use of several injection or casting channels, as visible on the figure 6 .

Le mode de réalisation préféré par injection assure une bonne maîtrise du procédé et sa parfaite reproductibilité. L'injection permet la création du noyau, le réglage de l'ébat lors du retrait, et l'assemblage du palier, qui est indémontable après injection, quand une des cages, intérieure ou extérieure, comporte une gorge ou un épaulement limitant le mouvement selon la direction axiale.The preferred embodiment by injection ensures good control of the process and its perfect reproducibility. The injection allows the creation of the core, the adjustment of the frost during the withdrawal, and the assembly of the bearing, which is unmountable after injection, when one of the cages, inner or outer, has a groove or a shoulder limiting movement in the axial direction.

Différentes matières plastiques présentent des qualités tribologiques convenant bien à cette application. Plus particulièrement l'emploi du POM est satisfaisant. La matière plastique utilisée peut être composite, et intégrer des composés améliorant le glissement, comme des bulles de lubrifiant, de PTFE, de « Delrin® », de « Rilsan®", de « Nylon® », ou similaire. De préférence, la matière plastique est choisie avec un coefficient de frottement compris entre 0,07 et 0,15. L'emploi de matières à coefficients de frottement plus bas est également possible, malgré leur coût plus élevé.Different plastics have tribological qualities well suited to this application. More particularly, the use of the POM is satisfactory. The plastic material used may be composite, and incorporate slip improving compounds, such as lubricant, PTFE, "Delrin®", "Rilsan®", "Nylon®", or similar bubbles. plastic material is chosen with a coefficient of friction between 0.07 and 0.15 The use of materials with lower coefficients of friction is also possible, despite their higher cost.

Le retrait se faisant de manière symétrique, on obtient le respect des partagements de l'engrènement entre une roue palier ainsi réalisée et le mobile qui engrène avec elle.The withdrawal being done in a symmetrical manner, we obtain the respect of the sharing of the meshing between a bearing wheel thus made and the mobile that meshes with it.

Selon le choix approprié de la matière plastique utilisée pour le noyau, il est possible d'éviter toute lubrification du palier.Depending on the appropriate choice of the plastic material used for the core, it is possible to avoid any lubrication of the bearing.

Claims (10)

  1. Smooth timepiece bearing (1), including a core (5) made of plastic material injected into a cavity (4) of revolution comprised in an outer cage (3) included in said bearing, and including at least one inner cage (2) contained within said cavity (4), said plastic core (5) being injected between said inner cage (2) and said outer cage (3) and delimited by an outer surface of revolution (20) of said inner cage (2) and by an inner surface of revolution (30) of said outer cage (3), said outer surface of revolution (20) or/and said inner surface of revolution (30) including at least one groove (6) or shoulder (7) of revolution for immobilising said core (5) in the direction of an axis of revolution (D) common to said outer surface of revolution (20) and said inner surface of revolution (30). characterized in that said outer surface of revolution (20) and said inner surface of revolution (30) each includes at least one groove or shoulder of revolution for immobilising said core (5) in the direction of said axis of revolution (D).
  2. Smooth bearing (1) according to claim 1, characterized in that one of said outer surface of revolution (20) and said inner surface of revolution (30) includes at least one groove and the other at least one shoulder, or vice versa, said at least one groove and said at least one shoulder being of revolution and for immobilising said core (5) in the direction of said axis of revolution (D).
  3. Smooth bearing (1) according to any of the preceding claims, characterized in that the shrinkage coefficient of the plastic material forming said core (5) is comprised between 2.0% and 3.0% which determines the operating clearance of said smooth bearing (1) between said outer cage (3) and said core (5) on the one hand, and between said inner cage (2) and said core (5) on the other hand.
  4. Smooth bearing (1) according any of the preceding claims, characterized in that it is exclusively formed of said inner cage (2), said core (5) and said outer cage (3).
  5. Smooth bearing (1) according to any of the preceding claims, characterized in that a plurality of inner cages (2), comprising contact surfaces of revolution coaxial to each other and to said cavity (4) about the same axis of revolution (D), are positioned in said cavity (4), said inner cages (2) being fitted inside each other and separated from said cavity (4), as regards the outermost cage, and in pairs as regards the other cages, in each case by a core (5) of plastic material injected into a chamber delimited by the inner volume of the outermost cage, and by the outer volume of the innermost cage.
  6. Timepiece movement (10) including at least one smooth bearing (1) according to any of the preceding claims1.
  7. Timepiece (100) including at least one smooth bearing (1) according to any of claims 1 to 5.
  8. Method of manufacturing a smooth timepiece bearing (1), characterized in that the following steps are performed:
    - an outer cage (3), which is intended to be incorporated in said smooth bearing (1) and which comprises a cavity (4) of revolution about an axis of revolution (D), is prepared, said cavity (4) including an inner surface of revolution (30) which includes at least one groove (6) or shoulder (7) of revolution in the direction of said axis of revolution (D).;
    - an inner cage (2), which is intended to be incorporated in said smooth bearing (1), is inserted in said cavity of revolution (4), coaxially to said outer cage (3) in said axis of revolution (D), said inner cage (2) including an outer surface of revolution (20) around said axis (D), said outer surface of revolution (20) including at least one groove (6) or shoulder (7) of revolution in the direction of said axis of revolution (D).
    - an injection or casting chamber (40) is delimited by said outer surface of revolution (20) and by said inner surface of revolution (30);
    - plastic material is injected or cast in said chamber (40) to form a core (5) delimited by said cavity (4);
    - the conditions for thermal or crystal shrinkage of said plastic material are ensured to limit said shrinkage to a range of between 2.0% and 3.0%;
    - said plastic material is allowed to shrink completely before said smooth bearing (1) is used;
  9. Method of manufacturing a smooth bearing (1) according to claim 8, characterized in that, before performing said injection or said casting:
    - an injection or casting chamber (40) is delimited around said cavity of revolution (4) by the addition of sealing surfaces (11;12) contiguous to said cavity (4);
    and in that:
    - said injection or casting of plastic material is carried out in said chamber (40) to form a core (5) delimited by said cavity (4) and said sealing surfaces;
    - after said plastic material has been completely shrunk, said sealing surfaces are moved away.
  10. Method of manufacturing a smooth bearing (1) according to claim 8 or 9, characterized in that, prior to performing said injection or said casting, said injection or casting chamber (40) is delimited by an outer surface of revolution (20) of said inner cage (2), and by an inner surface of revolution (30) of said outer cage (3) by the addition of sealing surfaces connected to said cavity (4) and to said inner cage (2) on the edge respectively of said inner surface of revolution (30) and said outer surface of revolution (20) and in that, after said plastic material has completely shrunk, said sealing surfaces are moved away.
EP11194060.7A 2011-12-16 2011-12-16 Overmoulded timepiece journal bearing Active EP2605083B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP11194060.7A EP2605083B1 (en) 2011-12-16 2011-12-16 Overmoulded timepiece journal bearing
EP12194356.7A EP2605084B1 (en) 2011-12-16 2012-11-27 Method for the manufacturing of a friction bearing
JP2012269006A JP2013127458A (en) 2011-12-16 2012-12-10 Smooth timepiece bearing
US13/710,831 US20130155823A1 (en) 2011-12-16 2012-12-11 Smooth timepiece bearing
CN2012105408376A CN103163773A (en) 2011-12-16 2012-12-14 Smooth timepiece bearing
RU2012154333/28A RU2012154333A (en) 2011-12-16 2012-12-14 SMOOTH BEARING FOR CLOCK

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11194060.7A EP2605083B1 (en) 2011-12-16 2011-12-16 Overmoulded timepiece journal bearing

Publications (2)

Publication Number Publication Date
EP2605083A1 EP2605083A1 (en) 2013-06-19
EP2605083B1 true EP2605083B1 (en) 2014-09-10

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EP11194060.7A Active EP2605083B1 (en) 2011-12-16 2011-12-16 Overmoulded timepiece journal bearing
EP12194356.7A Active EP2605084B1 (en) 2011-12-16 2012-11-27 Method for the manufacturing of a friction bearing

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EP12194356.7A Active EP2605084B1 (en) 2011-12-16 2012-11-27 Method for the manufacturing of a friction bearing

Country Status (5)

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US (1) US20130155823A1 (en)
EP (2) EP2605083B1 (en)
JP (1) JP2013127458A (en)
CN (1) CN103163773A (en)
RU (1) RU2012154333A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH710837B1 (en) * 2015-03-11 2022-11-30 Csem Ct Suisse Delectronique Microtechnique Sa Rech Developpement Shockproof stopper for moving parts.
US11392091B2 (en) * 2017-07-31 2022-07-19 Rolex Sa Watch pivot device

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Publication number Priority date Publication date Assignee Title
CH243388A (en) * 1944-03-18 1946-07-15 Spahr Stotz Fritz Shock-proof journal bearing.
GB834559A (en) * 1955-04-21 1960-05-11 Tissot Horlogerie Bearing element and method of making the same
US2956394A (en) * 1955-04-21 1960-10-18 Tissot Horlogerie Bearing element
US2822225A (en) * 1955-05-18 1958-02-04 F I Saemann Ball bearing assembly
US2878638A (en) * 1956-07-20 1959-03-24 Jaeger Ets Ed Sound-proof and shock absorbing bearing for precision mechanisms
US3397531A (en) * 1965-07-01 1968-08-20 Tissot Horlogerie Bearing means for arbor of a watch runner
US3457719A (en) * 1966-02-03 1969-07-29 Kienzle Uhrenfabriken Gmbh Plastic bearing bushing
FR1587976A (en) * 1967-10-25 1970-04-03
FR1579777A (en) * 1968-04-01 1969-08-29
US3590575A (en) * 1970-02-06 1971-07-06 Hamilton Watch Co Oilless shockproof bearing for timepieces
US3922041A (en) * 1970-06-25 1975-11-25 Portescap Elastic pivot bearings
CH1017770A4 (en) * 1970-07-06 1974-09-13 Portescap
CH1902471A4 (en) * 1971-12-28 1975-03-14
US3758178A (en) * 1972-02-23 1973-09-11 Pareohoc S A Shock absorbing bearing for timepiece and small apparatus
CH495673A4 (en) * 1973-04-06 1976-10-29 Seitz Sa Device for pivoting the face of a timepiece mobile
DE4136794A1 (en) * 1991-11-08 1993-05-19 Freudenberg Carl Fa SUPPORT DISC
DE4334985B4 (en) * 1993-10-14 2005-12-29 Stahlecker, Fritz Support disk for a support disk bearing of an OE spinning rotor and method for producing this support disk
DE19755725C2 (en) * 1997-12-15 1999-10-28 Ticona Gmbh Rotatable plastic rollers
FR2779096B1 (en) * 1998-05-28 2000-12-15 Skf France SUSPENSION STOP DEVICE
ATE283982T1 (en) * 2000-09-28 2004-12-15 Phoenix Ag JOINT
DE60137113D1 (en) * 2001-03-21 2009-02-05 Chronoswiss Uhren Gmbh clockwork
EP1986059A1 (en) * 2007-04-26 2008-10-29 ETA SA Manufacture Horlogère Suisse Pivoting device for an arbor inside a timepiece
JP5455115B2 (en) * 2009-10-07 2014-03-26 セイコーインスツル株式会社 Watch bearings, movements and portable watches

Also Published As

Publication number Publication date
EP2605084B1 (en) 2018-08-08
CN103163773A (en) 2013-06-19
EP2605084A3 (en) 2014-01-29
EP2605083A1 (en) 2013-06-19
RU2012154333A (en) 2014-06-20
EP2605084A2 (en) 2013-06-19
JP2013127458A (en) 2013-06-27
US20130155823A1 (en) 2013-06-20

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