EP2605084A2 - Konfektioniertes glattes Lager für Uhrwerk - Google Patents

Konfektioniertes glattes Lager für Uhrwerk Download PDF

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Publication number
EP2605084A2
EP2605084A2 EP12194356.7A EP12194356A EP2605084A2 EP 2605084 A2 EP2605084 A2 EP 2605084A2 EP 12194356 A EP12194356 A EP 12194356A EP 2605084 A2 EP2605084 A2 EP 2605084A2
Authority
EP
European Patent Office
Prior art keywords
revolution
core
cage
bearing
cavity
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.)
Granted
Application number
EP12194356.7A
Other languages
English (en)
French (fr)
Other versions
EP2605084B1 (de
EP2605084A3 (de
Inventor
Laurent Kaelin
Julien Moulin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
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.)
Filing date
Publication date
Application filed by ETA SA Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to EP12194356.7A priority Critical patent/EP2605084B1/de
Publication of EP2605084A2 publication Critical patent/EP2605084A2/de
Publication of EP2605084A3 publication Critical patent/EP2605084A3/de
Application granted granted Critical
Publication of EP2605084B1 publication Critical patent/EP2605084B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • 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 a molded overmolded clock bearing.
  • 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 on behalf of PORTESCAP illustrates a shock-absorbing 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 pendulum clock pivot with a plastic disk serving as counter-stone support of 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.
  • the document FR 1 587 976 A in the name of KURUCZ AND MATTHEY discloses a watch shock absorber bearing with a solid 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.
  • 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, characterized in that it comprises a plastic core injected into a cavity of revolution that includes an outer cage, and in that said core is movable with a residual functional game and permanent relative to said outer cage, and indisputedmontable relative to said outer cage.
  • said sliding bearing further comprises at least one inner cage contained in said cavity, and said plastic core is injected between said inner race and said outer race and said core is movable with a residual and permanent functional clearance with respect to said inner cage, and indisputedmontable with respect to said inner cage.
  • said core is delimited 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 said inner surface of revolution are coaxial around a same axis of revolution.
  • said outer surface of revolution and / or said inner surface of revolution comprises 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 surface. exterior of revolution and said inner surface 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 external, 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, said closure surfaces are moved away.
  • 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. And this core 5 is movable with a residual functional game and permanent with respect to the outer cage 3 , and indisputedmontable with respect to this outer cage 3.
  • the cavity 4 is open.
  • This first embodiment is visible on the figure 1 .
  • the plastic material has a slight shrinkage, which is sufficient to ensure the functional play JP bearing, necessary for the smooth operation of the plain bearing.
  • 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 this cavity 4, the respect of the However, the dimension is not important since the adjustment is by the injection or casting process, preferably injection.
  • This withdrawal can be used to obtain a radial clearance JR and / or an axial play JA, whose value is thus controlled.
  • 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 is then mobile with a residual functional game and permanent with respect to the inner cage 2, and indisputedmontable with respect to this inner cage 2.
  • 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 plastic material constituting the core 5 has a shrinkage coefficient of between 2.0% and 3.0% which determines the first functional clearance J1 of the plain bearing 1 between the inner cage 2 and the core 5 on the one hand , and the second functional clearance J2 between the outer cage 3 and the core 5 on the other hand.
  • the functional bearing game JP is then equal to the sum of the first functional game J1 and the second functional game J2.
  • the resulting axial clearance JA which is the sum of the upper axial clearance JAS and the lower axial clearance JAI, is about twice the radial clearance JR.
  • 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.
  • Each functional set, first functional clearance J1 between the inner cage 2 and the core 5 on the one hand, and the second functional clearance J2 between the outer cage 3 and the core 5, on the other hand, if necessary, is between 0.004 mm and 0.012 mm.
  • each radial functional clearance, the first radial functional clearance JR1 between the inner race 2 and the core 5 on the one hand, and the second radial functional clearance JR2 between the outer race 3 and the core 5, on the other hand, if there is takes place is between 0.004 mm and 0.012 mm.
  • each such functional clearance, J1, J2 is between 0.006 mm and 0.010 mm.
  • each such radial functional clearance, JR1, JR2, is between 0.006 mm and 0.010 mm.
  • 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 bearing1 and / or such a movement 10.
  • 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. .
  • a three-component smooth bearing 1 before making the injection or casting, is inserted into the cavity 4 of revolution, and coaxially with the outer cage 3 according to the invention.
  • 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 elementary functional play JE between the cages separated by the core concerned.
  • the figure 9 shows different relative positions between the outer cage 3, the inner cage 2 and the core 5 of a bearing 1 according to the invention.
  • the profile is here arbitrary, for example rounded, but preferably the core 5 has walls respectively parallel and perpendicular to the main axis D.
  • 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, inside or outside, has a groove or a shoulder limiting the 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 the like.
  • the plastic is chosen with a coefficient of friction of between 0.07 and 0.15. The use of materials with lower coefficients of friction is also possible, despite their higher cost.

Landscapes

  • 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)
EP12194356.7A 2011-12-16 2012-11-27 Verfahren zur Herstellung eines Gleitlagers Active EP2605084B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12194356.7A EP2605084B1 (de) 2011-12-16 2012-11-27 Verfahren zur Herstellung eines Gleitlagers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP11194060.7A EP2605083B1 (de) 2011-12-16 2011-12-16 Konfektioniertes glattes Lager für Uhrwerk
EP12194356.7A EP2605084B1 (de) 2011-12-16 2012-11-27 Verfahren zur Herstellung eines Gleitlagers

Publications (3)

Publication Number Publication Date
EP2605084A2 true EP2605084A2 (de) 2013-06-19
EP2605084A3 EP2605084A3 (de) 2014-01-29
EP2605084B1 EP2605084B1 (de) 2018-08-08

Family

ID=47216159

Family Applications (2)

Application Number Title Priority Date Filing Date
EP11194060.7A Active EP2605083B1 (de) 2011-12-16 2011-12-16 Konfektioniertes glattes Lager für Uhrwerk
EP12194356.7A Active EP2605084B1 (de) 2011-12-16 2012-11-27 Verfahren zur Herstellung eines Gleitlagers

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP11194060.7A Active EP2605083B1 (de) 2011-12-16 2011-12-16 Konfektioniertes glattes Lager für Uhrwerk

Country Status (5)

Country Link
US (1) US20130155823A1 (de)
EP (2) EP2605083B1 (de)
JP (1) JP2013127458A (de)
CN (1) CN103163773A (de)
RU (1) RU2012154333A (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH710837B1 (fr) * 2015-03-11 2022-11-30 Csem Ct Suisse Delectronique Microtechnique Sa Rech Developpement Butée antichoc pour organe mobile.
US11392091B2 (en) * 2017-07-31 2022-07-19 Rolex Sa Watch pivot device
CN116569114B (zh) * 2020-11-30 2025-07-25 高科办公用品有限公司 具有油浴中的石英机芯的表

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2956394A (en) 1955-04-21 1960-10-18 Tissot Horlogerie Bearing element
FR1579777A (de) 1968-04-01 1969-08-29
FR1587976A (de) 1967-10-25 1970-04-03
CH559383B5 (en) 1970-07-06 1975-02-28 Portescap Shock absorber for watch pivot - has resilient cushion surrounding pivot in shock absorber body
CH583934B5 (de) 1971-12-28 1977-01-14 Portescap

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH243388A (de) * 1944-03-18 1946-07-15 Spahr Stotz Fritz Stossgesichertes Zapfenlager.
GB834559A (en) * 1955-04-21 1960-05-11 Tissot Horlogerie Bearing element and method of making the same
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
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
US3758178A (en) * 1972-02-23 1973-09-11 Pareohoc S A Shock absorbing bearing for timepiece and small apparatus
CH495673A4 (fr) * 1973-04-06 1976-10-29 Seitz Sa Dispositif de pivotement de l'ace d'un mobile d'horlogerie
DE4136794A1 (de) * 1991-11-08 1993-05-19 Freudenberg Carl Fa Stuetzscheibe
DE4334985B4 (de) * 1993-10-14 2005-12-29 Stahlecker, Fritz Stützscheibe für eine Stützscheibenlagerung eines OE-Spinnrotors und Verfahren zur Herstellung dieser Stützscheibe
DE19755725C2 (de) * 1997-12-15 1999-10-28 Ticona Gmbh Drehbewegliche Kunststoffrollen
FR2779096B1 (fr) * 1998-05-28 2000-12-15 Skf France Dispositif de butee de suspension
DE50104710D1 (de) * 2000-09-28 2005-01-05 Phoenix Ag Gelenk
DE60137113D1 (de) * 2001-03-21 2009-02-05 Chronoswiss Uhren Gmbh Uhrwerk
EP1986059A1 (de) * 2007-04-26 2008-10-29 ETA SA Manufacture Horlogère Suisse Schwenkenvorrichtung einer Welle in einer Uhr
JP5455115B2 (ja) * 2009-10-07 2014-03-26 セイコーインスツル株式会社 時計用軸受、ムーブメントおよび携帯用時計

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2956394A (en) 1955-04-21 1960-10-18 Tissot Horlogerie Bearing element
FR1587976A (de) 1967-10-25 1970-04-03
FR1579777A (de) 1968-04-01 1969-08-29
CH559383B5 (en) 1970-07-06 1975-02-28 Portescap Shock absorber for watch pivot - has resilient cushion surrounding pivot in shock absorber body
CH583934B5 (de) 1971-12-28 1977-01-14 Portescap

Also Published As

Publication number Publication date
EP2605084B1 (de) 2018-08-08
US20130155823A1 (en) 2013-06-20
CN103163773A (zh) 2013-06-19
EP2605084A3 (de) 2014-01-29
EP2605083B1 (de) 2014-09-10
EP2605083A1 (de) 2013-06-19
RU2012154333A (ru) 2014-06-20
JP2013127458A (ja) 2013-06-27

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