EP4242753A1 - Vorrichtung zum führen einer welle einer unruh mit spiralfeder - Google Patents

Vorrichtung zum führen einer welle einer unruh mit spiralfeder Download PDF

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Publication number
EP4242753A1
EP4242753A1 EP22161630.3A EP22161630A EP4242753A1 EP 4242753 A1 EP4242753 A1 EP 4242753A1 EP 22161630 A EP22161630 A EP 22161630A EP 4242753 A1 EP4242753 A1 EP 4242753A1
Authority
EP
European Patent Office
Prior art keywords
contact
shaft
rotation shaft
blade
pivot
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.)
Pending
Application number
EP22161630.3A
Other languages
English (en)
French (fr)
Inventor
Thierry Conus
Raphaël Courvoisier
Jean-Luc Helfer
Sylvain Huot-Marchand
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 EP22161630.3A priority Critical patent/EP4242753A1/de
Priority to US18/169,957 priority patent/US20230288877A1/en
Priority to JP2023033406A priority patent/JP7542667B2/ja
Priority to KR1020230031334A priority patent/KR20230133796A/ko
Priority to CN202310229387.7A priority patent/CN116736674A/zh
Priority to CN202320451963.8U priority patent/CN219958082U/zh
Publication of EP4242753A1 publication Critical patent/EP4242753A1/de
Pending legal-status Critical Current

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Classifications

    • GPHYSICS
    • G04HOROLOGY
    • G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B31/00Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/004Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor characterised by the material used
    • GPHYSICS
    • G04HOROLOGY
    • G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B31/00Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/02Shock-damping bearings
    • GPHYSICS
    • G04HOROLOGY
    • G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B31/00Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/004Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor characterised by the material used
    • G04B31/012Metallic bearings
    • GPHYSICS
    • G04HOROLOGY
    • G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00Mechanisms for stabilising frequency
    • G04B17/04Oscillators acting by spring tension
    • G04B17/06Oscillators with hairsprings, e.g. balance
    • GPHYSICS
    • G04HOROLOGY
    • G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00Mechanisms for stabilising frequency
    • G04B17/04Oscillators acting by spring tension
    • G04B17/06Oscillators with hairsprings, e.g. balance
    • G04B17/063Balance construction
    • GPHYSICS
    • G04HOROLOGY
    • G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00Mechanisms for stabilising frequency
    • G04B17/32Component parts or constructional details, e.g. collet, stud, virole or piton
    • GPHYSICS
    • G04HOROLOGY
    • G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B31/00Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/08Lubrication

Definitions

  • the invention relates to a device for guiding a rotating shaft of a spiral spring balance of a timepiece.
  • the invention also relates to a watch movement and a timepiece respectively comprising such a device for guiding a rotating shaft of a spiral spring balance.
  • the document CH 239 786 describes a device for guiding a pivot at one end of the rotation shaft of a spiral balance.
  • the device is arranged with an olive stone and a stop inclined relative to the balance shaft.
  • the shaft is guided without play. Friction is therefore independent of the position of the watch. In a horizontal position of the watch, the additional friction of the cylindrical part of the pivot against the olive stone is thus similar to that experienced in a vertical position. On the other hand, the amplitude is reduced for all positions, which constitutes a disadvantage for controlling precision.
  • the document EP 3 382 472 A1 describes a guide bearing for a pivot of a rotation shaft of a spiral balance of a timepiece.
  • a guide bearing may be provided on each side of the ends of the rotating shaft.
  • the guide bearing can be constituted in one embodiment of three curved blades in the shape of a spiral regularly spaced from each other, a first end of each blade is fixed to a ring coaxial with the rotation shaft while a second end of each blade comes into contact with one end of the rotation shaft of the balance to hold it radially.
  • the guide bearing is made of a metallic material.
  • the guide bearing made of a metallic material does not sufficiently reduce the forces in contact with the shaft or the pivot on the shaft. Under these conditions, there is too much energy loss due mainly to friction with the end of the pivot or the rotation shaft, even if the friction no longer depends too much on the orientation of the watch, this which constitutes a disadvantage.
  • the main aim of the invention is therefore to overcome the disadvantages of the state of the art by proposing a device for guiding a rotation shaft of a spiral balance with limited clearance of the shaft due to gravity and with a material and a geometry of the contact parts of the guide selected to reduce the support forces and therefore the friction forces.
  • the invention relates to a device for guiding a rotation shaft of a spiral balance, which comprises the characteristics defined in independent claim 1.
  • the material can be ceramic or glass or also a polymer filled or not to produce in particular the guide blade(s) and maintain the guide bearing of the device in contact with one end of the rotation shaft of the spiral balance or end pivot of the rotation shaft.
  • the material there must still be machining accuracy within a defined tolerance interval.
  • the geometry of the blade(s) can also be adapted to minimize the contact surface with the end of the shaft or the pivot on the shaft.
  • the invention also relates to a watch movement which comprises such a device as defined in claim 14.
  • the invention also relates to a timepiece which comprises such a device as defined in claim 15.
  • the device for guiding a rotation shaft of the spiral balance also includes said shaft which is part of a whole with the guiding elements of this shaft and means for avoiding the effect of gravity.
  • the assembly which comprises at least one guide bearing and the rotation shaft of the spiral balance to define the device for guiding a rotation shaft of the spiral balance.
  • a guide bearing may be provided, which may consist of contact parts such as flexible blades for example for positioning the axis of the spiral balance. This makes it possible in particular to limit parasitic movements of the hairspring balance, when the movement is in a horizontal position. In general, the movements caused are responsible for defects chronometric. In one embodiment with flexible blades, these blades have a centering effect on the axis of rotation of the spiral balance.
  • components made of polymer materials are for example made for flexible or elastic blades in a guide bearing or also for the coating of contact parts of such guide bearings.
  • flexible or elastic blades or contact parts it can also be imagined to use an elastomer provided with friction surfaces made of a material more suited to friction with suitable inserts.
  • THE figures 1a and 1b represent the spiral balance with the device 1 for guiding the rotation shaft assembly 6 of said spiral balance.
  • the spiral balance is formed of a serge 12 connected for example by three arms 15 to a central rotation shaft 6, and a spiral spring 13, having a first end connected to a not shown eyebolt of a bridge of the pendulum. A second end of the spiral spring 13 is fixed directly, or indirectly via a ferrule, on the rotation shaft 6 of the spiral balance.
  • the device 1 for guiding the rotation shaft 6 of the spiral balance comprises said rotation shaft 6 and at least one guide bearing 2 preferably disposed at one end of the rotation shaft 6.
  • at least one guide bearing 2 preferably disposed at one end of the rotation shaft 6.
  • two guide bearings 2 of the rotation shaft arranged at the two ends of the rotation shaft in particular to center the rotation shaft 6 along the central axis AC.
  • the guide bearing 2 can advantageously be mounted at an upper end of the rotation shaft 6, for example on the dial side. However, it can be envisaged to have two guide bearings 2 mounted respectively at each end of the rotation shaft 6.
  • Each guide bearing 2 described in more detail with reference to the figures 2 and 3 below, comprises contact and holding parts of the ends of the rotation shaft or end pivots of the rotation shaft given that the rotation shaft linked to the spiral balance is always in reciprocating rotation in normal operation with respect to the guide bearing 2 which is fixedly mounted in or on an adjustment member not shown.
  • At least all the parts in contact with the guide bearing 2 and the rotation shaft 6 or the end pivot of the rotation shaft are advantageously made of a material whose modulus of elasticity (Young's modulus) is less than or equal to 100 GPa and/or have the lowest possible coefficient of friction, for example at least less than or equal to 0.15.
  • the material may be ceramic, glass or a charged or unfilled polymer and a list of these materials will be given in more detail in the second part of the detailed description.
  • FIG. 2 represents a first embodiment of the guide bearing 2 of the rotation shaft 6 linked to the spiral balance.
  • the general shape of the guide bearing 2 is generally cylindrical on the periphery. to be housed and fixed in an opening of an adjustment or mounting plate not shown.
  • at least one guide blade 3 is provided to come into contact at one of its ends 4 with the rotation shaft 6 or on an attached part of the rotation shaft, which may be a pivot.
  • At least one guide bearing 2 comprises, on a first side of the central axis AC, a support part 5, which is a support surface 5 of any geometric shape adapted to make point contact or on a contact line with the rotation shaft 6 or the pivot mounted on the rotation shaft.
  • the support surface can also be made in the shape of a V or a pad, or the like, and is arranged to center the axis of rotation of a shaft 6 on a plane bisecting the support surface 5.
  • This surface d The support 5 is symmetrical.
  • the same guide bearing 2 comprises, on a second side of the axis of revolution, which is opposite the first side, at least one holding element 4 at the free end of the blade 3, which is arranged substantially diametrically opposite the support surface 5. It is understood that the support surface 5, symmetrical with respect to its bisecting plane, comprises two elementary support surfaces, of the V-shaped surface in this case.
  • all the holding elements 3, 4 with the contact surface 40 are arranged to exert on a shaft 6 a resulting elastic return force directed towards the central axis AC, and to prevent a radial exit, out of this guide bearing 2, a shaft 6 inserted axially in the direction of the axis of revolution in this same guide bearing 2.
  • a single blade 3 having a contact surface 40 to hold the rotation shaft against the V-shaped surface 5 is difficult to produce because depending on the orientation of the timepiece the spiral balance is too heavy to be held by the single blade provided.
  • the blade 3 up to its free end is of rectangular cross section so as to have a flat contact portion 40 in contact with the end of the shaft 6 or the pivot 6' on a contact line.
  • at least the free end of the blade 3 has a lenticular section geometry to have only one point of contact on the portion 40 in order to reduce friction in contact with the end of the shaft rotation 6 or the pivot mounted on the rotation shaft 6.
  • each support part 5 can be produced for example in the form of a convex structure or portion of a ball.
  • many other structures can be imagined to have such punctual contact.
  • For contact along a contact line it may also be a cylindrical structure or portion of a support part arranged along an axis parallel to the axis of rotation of the rotation shaft or any other structure. It can be imagined a combination of point contact or along a line of contact.
  • any geometric shape can be proposed to make point contact or on a contact line with the rotation shaft or the pivot mounted on the rotation shaft
  • FIG. 3 represents a second embodiment of the guide bearing 2 of the device 1 for guiding the rotation shaft 6 of the spiral balance.
  • This guide bearing 2 can comprise at least one contact blade 3 and two support parts 5, which are preferably two other contact blades 3.
  • the guide bearing 2 is composed of a peripheral ring and three blades 3 in the form of turns to move in the direction of the rotation shaft 6 to come into contact with the rotation shaft 6 in order to hold it and guide it along the central axis AC.
  • the free end 4 of each blade 3 comes into direct contact with the rotation shaft 6 to hold it, center it and guide it along the central axis AC.
  • the three blades 3 can be of another shape and section other than rectangular than those of the turns.
  • each blade is rectilinear arranged angularly and regularly spaced 120° from one another to each contact the rotation shaft regularly. It can still be envisaged to have more than three contact blades with the rotation shaft.
  • the guide bearing 2 of this second embodiment can be obtained in one-piece form in a ceramic material, glass or filled or unfilled polymer, in particular below the limit threshold of the modulus of elasticity less than or equal to 100 GPa and/or have the lowest possible coefficient of friction, for example at least less than or equal to 0.15.
  • Both the part of the rotation shaft 6 in contact with parts of the guide bearing 2 are made of the same material or a different material or coating fulfilling the conditions defined by the threshold of the modulus of elasticity or having a coefficient of friction as low as possible, for example at least less than or equal to 0.15.
  • ceramics to be used for the guide bearing and/or the rotation shaft it may be ceramics based on oxides, mainly alumina and zirconia, or silica.
  • zirconium oxide it can be used in zirconia stabilized with yttrium oxide (ZrO 2 +Y 2 O 3 ), which have a metastable tetragonal crystal structure, a grain size less than 0.50 ⁇ m, a density greater than 6.00 g/cm 3 and a hardness of approximately 1200 HV.
  • Zirconia can also be stabilized with cerium oxide (ZrO 2 + CeO 2 ) or magnesium oxide ((ZrO 2 + MgO), depending on the properties of the desired final material.
  • the composites are generally 80% 3Y-TZP / 20% Al 2 O 3 (ATZ) or 90% Al 2 O 3 / 10% 3Y-TZP (ZTA), combine the properties of aluminas and high purity zirconias to obtain final characteristics that offer the best of each material.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Sliding-Contact Bearings (AREA)
  • Support Of The Bearing (AREA)
EP22161630.3A 2022-03-11 2022-03-11 Vorrichtung zum führen einer welle einer unruh mit spiralfeder Pending EP4242753A1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP22161630.3A EP4242753A1 (de) 2022-03-11 2022-03-11 Vorrichtung zum führen einer welle einer unruh mit spiralfeder
US18/169,957 US20230288877A1 (en) 2022-03-11 2023-02-16 Device for guiding a shaft of a sprung balance
JP2023033406A JP7542667B2 (ja) 2022-03-11 2023-03-06 ばね付きてんぷの軸を案内するための機器
KR1020230031334A KR20230133796A (ko) 2022-03-11 2023-03-09 스프링형 밸런스의 샤프트를 안내하기 위한 디바이스
CN202310229387.7A CN116736674A (zh) 2022-03-11 2023-03-10 用于引导游丝摆轮系统的旋转轴的装置
CN202320451963.8U CN219958082U (zh) 2022-03-11 2023-03-10 用于引导游丝摆轮系统的旋转轴的装置及钟表机芯和钟表

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22161630.3A EP4242753A1 (de) 2022-03-11 2022-03-11 Vorrichtung zum führen einer welle einer unruh mit spiralfeder

Publications (1)

Publication Number Publication Date
EP4242753A1 true EP4242753A1 (de) 2023-09-13

Family

ID=80738841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22161630.3A Pending EP4242753A1 (de) 2022-03-11 2022-03-11 Vorrichtung zum führen einer welle einer unruh mit spiralfeder

Country Status (5)

Country Link
US (1) US20230288877A1 (de)
EP (1) EP4242753A1 (de)
JP (1) JP7542667B2 (de)
KR (1) KR20230133796A (de)
CN (2) CN116736674A (de)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH239786A (fr) 1944-02-04 1945-11-15 Ditisheim & Cie Fabriques Vulc Dispositif de pivotement d'un arbre tel que l'arbre du balancier d'un mouvement d'horlogerie, d'un porte-échappement ou d'un compteur, par exemple.
CH269552A (fr) 1946-10-19 1950-07-15 Linde Air Prod Co Dispositif à pivot.
FR3039292A1 (fr) * 2015-07-24 2017-01-27 Commissariat Energie Atomique Ressort spiral et procede de realisation du ressort spiral
CH705906B1 (fr) * 2011-12-15 2017-07-14 Eta Sa Mft Horlogère Suisse Système amortisseur de chocs pour un axe d'un mobile d'une pièce d'horlogerie.
EP3382472A1 (de) 2017-03-30 2018-10-03 Rolex Sa Führungslager einer unruhwelle einer uhr
EP3396470A1 (de) 2017-04-24 2018-10-31 ETA SA Manufacture Horlogère Suisse Mechanische bremsvorrichtung für drehteil einer uhr
EP3258325B1 (de) 2016-06-13 2019-10-30 Rolex Sa Uhrenwelle
EP3291025B1 (de) * 2016-08-30 2020-08-19 Montres Breguet S.A. Stossdämpfer mit multileaf-blattfedern
CH716957A2 (fr) 2019-12-16 2021-06-30 Eta Sa Mft Horlogere Suisse Dispositif de guidage pour afficheur d'horlogerie.

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH239786A (fr) 1944-02-04 1945-11-15 Ditisheim & Cie Fabriques Vulc Dispositif de pivotement d'un arbre tel que l'arbre du balancier d'un mouvement d'horlogerie, d'un porte-échappement ou d'un compteur, par exemple.
CH269552A (fr) 1946-10-19 1950-07-15 Linde Air Prod Co Dispositif à pivot.
CH705906B1 (fr) * 2011-12-15 2017-07-14 Eta Sa Mft Horlogère Suisse Système amortisseur de chocs pour un axe d'un mobile d'une pièce d'horlogerie.
FR3039292A1 (fr) * 2015-07-24 2017-01-27 Commissariat Energie Atomique Ressort spiral et procede de realisation du ressort spiral
EP3258325B1 (de) 2016-06-13 2019-10-30 Rolex Sa Uhrenwelle
EP3291025B1 (de) * 2016-08-30 2020-08-19 Montres Breguet S.A. Stossdämpfer mit multileaf-blattfedern
EP3382472A1 (de) 2017-03-30 2018-10-03 Rolex Sa Führungslager einer unruhwelle einer uhr
EP3396470A1 (de) 2017-04-24 2018-10-31 ETA SA Manufacture Horlogère Suisse Mechanische bremsvorrichtung für drehteil einer uhr
CH716957A2 (fr) 2019-12-16 2021-06-30 Eta Sa Mft Horlogere Suisse Dispositif de guidage pour afficheur d'horlogerie.

Also Published As

Publication number Publication date
KR20230133796A (ko) 2023-09-19
CN116736674A (zh) 2023-09-12
JP7542667B2 (ja) 2024-08-30
CN219958082U (zh) 2023-11-03
JP2023133197A (ja) 2023-09-22
US20230288877A1 (en) 2023-09-14

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