EP3839651A1 - Mechanischer oszillator einer uhr mit flexibler führung - Google Patents

Mechanischer oszillator einer uhr mit flexibler führung Download PDF

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Publication number
EP3839651A1
EP3839651A1 EP19217918.2A EP19217918A EP3839651A1 EP 3839651 A1 EP3839651 A1 EP 3839651A1 EP 19217918 A EP19217918 A EP 19217918A EP 3839651 A1 EP3839651 A1 EP 3839651A1
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EP
European Patent Office
Prior art keywords
balance
oscillator
tenon
movable part
axis
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
EP19217918.2A
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English (en)
French (fr)
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EP3839651B1 (de
Inventor
Stéphane OES
Anthony Krüttli
David Chabloz
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Patek Philippe SA Geneve
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Patek Philippe SA Geneve
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Priority to EP19217918.2A priority Critical patent/EP3839651B1/de
Publication of EP3839651A1 publication Critical patent/EP3839651A1/de
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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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/045—Oscillators acting by spring tension with oscillating blade springs

Definitions

  • the present invention relates to a mechanical horological oscillator with flexible guidance, intended to oscillate around a virtual oscillation axis, said oscillator comprising a movable part centered on the oscillation axis, a fixing part intended to be fixed to a first support element, and at least first and second elastic blades connecting the movable part and the fixing part and arranged to exert on the movable part, relative to the fixing part, a return torque.
  • Such oscillators also called flexible pivot oscillators, are designed to rotate without a physical axis of rotation, and therefore without friction, around a virtual axis of rotation, by virtue of an arrangement of elastic parts.
  • pivots with separate cross blades pivots with non-separated cross blades or pivots with offset center of rotation known as “RCC” (Remote Center Compliance).
  • RRC Remote Center Compliance
  • oscillators have one or more flexible blades, generally monolithic with the moving part and the fixing part, replacing the hairspring and the physical axis of oscillation. These oscillators are particularly advantageous in terms of reducing friction.
  • operating stops are generally positioned outside the oscillator in order to be able to act on its moving part.
  • This type of construction with a shaft or a central material element requires the production of blades comprising a recess, a clearance or an eye formed around the shaft or the central material element, allowing the passage of said shaft or element of central material without contact with the blades.
  • This has the drawback of increasing the complexity of the design and manufacture of the blades.
  • This also has the negative effect of reducing the effective length of the slats for a given bulk, and therefore of reducing their stiffness.
  • the present invention aims to remedy these drawbacks by proposing an oscillator with flexible guidance which is provided in all radial and axial positions, while retaining the advantages of an oscillator with flexible guidance.
  • the flexible guided oscillator according to the invention allows by means of a single tenon integrated in the central hub of the attached balance to obtain stops in all directions X, Y, Z, over a small diameter, which has the advantage of reducing the friction torque and disturbances.
  • the balance is arranged to constitute the inertial element of the oscillator.
  • This advantageously makes it possible to be able to dissociate the inertia of the oscillator from the stiffness of the elastic blades, thus making it possible to adjust the inertia of the oscillator in an easy and known manner via the attached balance, as for a standard balance, and an embodiment blades with the desired stiffness, without any constraints on the dimensioning of the blades to obtain the good stiffness / inertia compromise usually sought in standard flexible guide oscillators.
  • the oscillator is such that its movable part has a shape arranged to define an interior zone empty of any element of material of the movable part or it does not include a physical shaft passing through the movable part and / or the elastic blades.
  • the present invention also relates to a regulating mechanism, a horological movement as well as a timepiece comprising such an oscillator.
  • FIG. 1 With reference to figures 1 to 3 , there is shown a flexible guided oscillator of the type with separate crossed blades, according to which the elastic blades 5, 6 are of the same length and cross each other without contact, extending in two different parallel planes.
  • these elastic strips 5, 6 cross at a point P which constitutes the center of rotation of the mobile part 2 with respect to the fixing part 3.
  • the line passing through the point P and perpendicular to the plane of oscillator 1 constitutes the axis of oscillation A of the movable part 2 with respect to the fixing part 3.
  • said movable part 2 oscillates around the axis A with respect to the fixing part 3, the elastic blades 5 , 6 exerting on the movable part 2, relative to the fixing part 3, a return torque like the hairspring of a balance-spring oscillator.
  • Oscillator 1 is associated with an escapement (not shown) which may be of the conventional type such as a Swiss lever escapement or of any other type.
  • an escapement (not shown) which may be of the conventional type such as a Swiss lever escapement or of any other type.
  • a pin 7 intended to cooperate with a fork of an anchor of the escapement mechanism for maintaining the oscillations.
  • the ankle 7 is carried by a free end of an arm 2a extending from the free part 2 towards the axis of oscillation A, forming with the free part 2 a rigid part.
  • Such an oscillator can be manufactured in a monolithic manner, for example in silicon or in any other suitable material according to the etching technique.
  • deep reactive ionic called “DRIE” (Deep Reactive Ion Etching)
  • LIGA deep reactive ionic
  • the oscillator 1 comprises at least one rocker 8, rigid, attached and made integral with the movable part 2, said rocker 8 comprising a rim 10 of annular, continuous or discontinuous shape, a hub 12 having a hole central 14, centered on the axis of oscillation A, and at least one arm 16 (here four arms 16) connecting said hub 12 to the rim 10.
  • the oscillator 1 also comprises a tenon 18, centered on the axis d 'oscillation A, said tenon 18 being on the one hand integral at least in axial translation with a second support element (not shown in the figures 1 to 3 ), such as a bridge, and on the other hand positioned in the central hole 14 of the hub 12 of the balance 8, so that said balance 8 oscillates along the axis A around the tenon 18.
  • a second support element not shown in the figures 1 to 3
  • the tenon 18 has a head 18a and a foot 18b integral with one another.
  • the head 18a preferably of cylindrical shape, is arranged to be housed in the second support element, integrally in translation and in rotation with said second support element, for example by driving.
  • the foot 18b extends along the axis A and is of cylindrical shape concentric with the axis A, allowing the hub 12 to pivot around the foot 18b.
  • Said foot 18b is arranged to project from the second support element, perpendicularly to the head 18a, and to pass through the central hole 14 of the hub 12.
  • the foot 18b has a diameter smaller than the diameter of the head 18a so as to form a shoulder 18c between the foot 18b and the head 18a.
  • the dimensions of the tenon 18 and of the central hole 14 are chosen so as to leave an axial clearance between the upper surface 12a of the hub 12 and the shoulder 18c of the tenon 18 constituting a bearing surface defining an axial operating stop as well as a radial clearance between the inner periphery 12b of the hub 12 and the outer surface 18d of the foot 18b of the tenon 18 constituting a radial bearing surface defining a radial operating stop.
  • a precise dimensioning of the tenon 18 concentric with the oscillator 1 and integrated into the central hole 14 of the rigid balance 8 makes it possible to obtain the appropriate clearance between said tenon 18 and the means 12 of the balance 8 to form stops of radial and axial operation ensuring the oscillator 1 in all radial and axial positions in the event of impacts. These stops are formed as close as possible to the axis of oscillation A so that the friction torque as well as the disturbances are reduced.
  • the tenon 18 may be monolithic with the second support element, and then be in the form only of the cylindrical foot 18b, the bearing surface defining the axial operating stop being constituted by the surface of the second support member, in place of the shoulder 18c.
  • Said cylindrical foot 8b can for example be machined directly in the second support element.
  • the balance 8 is arranged to constitute the inertial element of the oscillator 1, independently of the inertia of the mobile part 2.
  • the balance 8, and more particularly the rim 10, and the movable part 2 are preferably made of materials different from each other, the material of the balance 8, and more particularly the material of the rim 10, having an inertia greater than that of the movable part 2.
  • the materials of the balance and of the moving part 2 are chosen so that the inertia of the moving part 2 is negligible compared to the inertia of the balance.
  • the mobile part 2 can be made of silicon and the rim can be made of CuBe.
  • the geometry of the mobile part 2 can be easily and freely modified to be perfectly adapted in order to ensure the assembly with the rim 10, to integrate measuring elements or even to be perfectly adapted to the geometry of the blades, without risk modifying the global inertia of oscillator 1.
  • this makes it possible to dissociate the inertia of oscillator 1 from the stiffness of the first and second elastic blades 5,6, and to produce elastic blades of the length necessary to obtain the desired stiffness without having to worry about other constraints that would have been imposed to obtain the appropriate inertia of the oscillator.
  • the oscillator according to the invention makes it possible to adjust the inertia and its balance / unbalance via the balance, for example by an appropriate sizing of the balance and its rim and / or by the use of weights positioned on the balance, so Similar to the inertia and balance / unbalance setting for a standard balance.
  • the balance 8, and more particularly its rim 10, and the mobile part 2 can advantageously have circular or annular shapes of different diameters, the diameter of the rim 10 being chosen to obtain the appropriate inertia of the oscillator 1.
  • the rim 10 can be of continuous circular or annular shape, or comprise at least two circular portions, preferably symmetrical with respect to the axis A. It is also possible to integrate design elements and decorations such as bevels, strokes, polishing or coloring.
  • the material of the balance 8 is also chosen so that said balance 8 is able to withstand shocks. Besides CuBe, this material can be brasses, nickel silver, titanium, steel and nickel.
  • the tenon 18 is also made of a material capable of withstanding shocks, such as for example steel preferably or CuBe, brass, nickel silver, titanium, and ruby.
  • the balance 8 can be kept centered on the upper face of the mobile part 2 by pins 20 on which weights 22 can be positioned for adjusting the inertia of the balance 8.
  • the balance 8 can be assembled to the movable part 2 for example by brazing, elastic clamping, clipping or gluing.
  • the movable part 2 has a shape arranged to define a central interior zone, centered on the axis of oscillation A, empty of any element of material of the movable part.
  • the movable part 2 may have a continuous or discontinuous annular shape, without any element of free part material in the center.
  • the oscillator according to the invention has all the advantages of a flexible oscillator with virtual pivot. It also remains very compact.
  • a second balance similar to the balance 8 can be assembled on the underside of the moving part 2, said second balance cooperating as described above with a second tenon similar to tenon 18 and provided in a support member under the oscillator.
  • FIG. 4 Another variant embodiment of an oscillator according to the invention is shown in the figures 4 to 8 , the same references being used to designate the same elements as for the figures 1 to 3 .
  • the figures 4 and 5 show a regulating mechanism comprising the oscillator with flexible guide 1 according to the invention and an escape mechanism 30.
  • Said escape mechanism 30 comprises in known manner an escape wheel 32 and an anchor 34 mounted on its axis 36, and comprising a fork 38 arranged to cooperate with an ankle 37 provided on the balance 8 as will be described in more detail below.
  • the balance 8 of the figures 4 to 8 differs from the pendulum of figures 1 to 3 by the shape of the tenon 18, which is here coupled to the hub 12 of the balance 8 by a bayonet device.
  • the tenon 18 comprises a head 18a and a foot 18b integral with one another.
  • the head 18a is cylindrical in shape, and is arranged to be housed in a housing 39a provided in a bridge 39 (shown partially in FIG. figure 6 and also visible on the figure 4 ) constituting here the second support element, integral in axial translation with said second support element but free to rotate relative thereto.
  • the head 18a has a slot 40 on its outer surface (cf. Figure 4 ) allowing the introduction of a tool so that said head 18a is operable by a user so as to be able to rotate the tenon 18 between different angular positions as will be described in detail below.
  • the foot 18b extends along the axis A, and has a first skirt 42 linked to the head 18a, arranged to project from said second support element, perpendicularly to the head 18a, and of cylindrical shape concentric with the axis A, of diameter smaller than the diameter of the head 18a so as to form a shoulder 18c between the foot 18b and the head 18a on which the second support element rests.
  • the foot 18b also comprises a second skirt 44 of diameter smaller than the diameter of the first skirt 42, so as to form a shoulder 54.
  • the second skirt 44 passes through the central hole 14 of the hub 12 of the balance 8.
  • the foot 18b being terminated by a fin 46 linked to the second skirt 44 and extending perpendicularly to said foot 18b.
  • the central hole 14 of the hub 12 has two first circular portions 48 having a first diameter, alternated with two second circular portions 50 having a second diameter smaller than the first diameter of the first portions 48, said second diameter being between the diameter of the first skirt 42 and the diameter of the second skirt 44, the two first portions being opposite to each other with respect to the axis A to form a groove 52 of dimensions greater than the dimensions of the fin 46, and the length of fin 46 being greater than the second diameter of second portions 50.
  • the tenon 18 can move between a first angular mounting position, as shown in FIG. figure 7 , according to which the fin 46 of the tenon 18 can be introduced into the groove 52 of the central hole 14 of the hub 12 of the balance 8, and, by rotating the head 18a by 90 °, a second angular locking position, as shown in the figure 8 , according to which the fin 46 of the tenon 18 is capable of cooperating with the second portions 50 of the central hole 14, the inner face 46a of the fin 46 constituting a bearing surface defining lower axial operating stops, the shoulder 54 of the first skirt 42 constituting a bearing surface defining upper axial operating stops, and the outer surface 56 of the second skirt 44 constituting a bearing surface defining radial operating stops for the second portions 50 of the rocker 8 , especially in the event of shocks.
  • the rim 10 of the balance 8 may be discontinuous and comprise at least two circular or annular portions 10a, 10b, symmetrical with respect to the axis A. Said circular portions 10a, 10b are positioned on each side of the anchor 34.
  • a pin 37 intended to cooperate with the fork 38 of the anchor 34 for the maintenance of the oscillations.
  • the pin 37 extends in the direction of the second support element so that the anchor 34 is positioned above the hub 12 of the balance 8, facing the second support element, and opposite the movable part 2 This makes it possible to position the anchor 34 close to the balance 8, on the side opposite the blades 5, 6, and thus to have a relatively short ankle 37, ensuring good perpendicularity.
  • the movable part 2 of generally annular shape, is also discontinuous and stops so as to be able to position the anchor 34 between the two ends of the movable part 2, as close as possible to the oscillator 1.
  • the axis 36 of the anchor 34 can then be mounted to pivot in the same bridge as the oscillator 1. This makes it possible to have less dimension chain, and to have better positioning accuracy, with fewer components. .
  • the anchor 34 is positioned between the two ends of the movable part 2 and between the two circular portions 10a, 10b of the rim 10, the axis 36 of the anchor 34 being arranged to lie in the stroke of said circular portions 10a, 10b so that said axis 36 constitutes a stop for said circular portions 10a, 10b of the rim 10 of the balance 8 and that the elastic blades 5 and 6 do not strike said axis 36 of the anchor 34 .
  • the blades 5, 6, the movable part 2 and the fixing part 3 can be made monolithically as described above for the first variant of the figures 1 to 3 .
  • the blades 5, 6, the movable part 2 and the fixing part 3 can also be made in several parts as shown here on figures 4 to 8 .
  • the movable part 2 can comprise a first upper element 2a of movable part 2 and a second lower element 2b of movable part 2, superimposed and made integral with one another, by being assembled for example by means of pins. 20 which will be used to fix the portions 10a, 10b of the rim 10, by inserting spacers 59.
  • the fixing part 3 comprises a first upper element 3a of fixing part 3 and a second lower element 3b of fixing part 3, superimposed and made integral with one another, by being assembled for example by means pins 60.
  • the first upper element 2a of movable part 2 is connected to the first upper element 3a of fixing part 3 by the first elastic blade 5 and the second lower element 2b of movable part 2 is connected to the second lower element 3b of fixing part 3 by the second elastic blade 6.
  • Said first and second elements 2a, 2b of mobile part 2 are symmetrical in shape with respect to a straight line perpendicular and secant to the axis of oscillation A (mirror symmetry).
  • said first and second elements 2a, 2b of movable part 2 have a first annular portion open over an angle of approximately 120 ° with respect to the point P of intersection of the blades 5, 6, terminated at one of the two free ends by a arm carrying a second annular portion of diameter greater than the first annular portion and forming an angle of approximately 30 ° with respect to the point P.
  • One end of an elastic blade is fixed to said second annular portion, the other end of the elastic blade being fixed to the corresponding fixing part member.
  • This embodiment in several parts advantageously makes it possible on the one hand, in a monolithic manner, to manufacture a first stage corresponding to the first element 2a of the movable part, to the first element 3a of the fixing part and to the first blade 5, and on the other hand leaves a second stage corresponding to the second element 2b of the movable part, to the second element 3b of the fixing part and to the second blade 6.
  • This allows manufacturing of each stage on a single level, which is advantageous in the context of a manufacture of silicon elements by DRIE.
  • This also makes it possible to have a real physical separation of the blades 5 and 6, obtained more easily than with a monolithic manufacture of a mobile part in a single element.
  • the first and second stages are superimposed and assembled by the pins 20.
  • the serge 10 is then assembled to the movable part 2 by means of the pins 20 then the weights 22 are put in place in order to obtain the appropriate inertia.
  • the first and second annular portions of the elements 2a, 2b of the movable part 2 have diameters different from the diameter of the rim 10.
  • This shape of the elements 2a, 2b of the movable part 2 is particularly suitable so that the elastic blades 5 and 6 can have the length necessary to present the required stiffness.
  • the mobile part 2 is made of silicon and the rim 10 is made of CuBe for example, so that the inertial element of the oscillator 1 is formed by the balance 8, making it possible to dissociate the inertia of the oscillator 1 of the stiffness of the blades 5, 6.
  • the oscillator according to the invention can also include more than two elastic blades.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Micromachines (AREA)
EP19217918.2A 2019-12-19 2019-12-19 Mechanischer oszillator einer uhr mit flexibler führung Active EP3839651B1 (de)

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EP19217918.2A EP3839651B1 (de) 2019-12-19 2019-12-19 Mechanischer oszillator einer uhr mit flexibler führung

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EP19217918.2A EP3839651B1 (de) 2019-12-19 2019-12-19 Mechanischer oszillator einer uhr mit flexibler führung

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EP3839651A1 true EP3839651A1 (de) 2021-06-23
EP3839651B1 EP3839651B1 (de) 2024-05-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4286959A1 (de) 2022-06-02 2023-12-06 Patek Philippe SA Genève Oszillator einer uhr mit flexiblem zapfen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH705928A2 (fr) * 2011-12-22 2013-06-28 Nivarox Sa Procédé d'amélioration du pivotement d'un balancier, balancier, ensemble balancier-spiral, mouvement et pièce d'horlogerie.
EP2911012A1 (de) 2014-02-20 2015-08-26 CSEM Centre Suisse d'Electronique et de Microtechnique SA - Recherche et Développement Oszillator einer Uhr
EP3324246A1 (de) 2016-11-16 2018-05-23 The Swatch Group Research and Development Ltd Schutz eines plattenresonator-mechanismus gegen axiale stosseinwirkungen
EP3356690A1 (de) 2015-09-29 2018-08-08 Patek Philippe SA Genève Mechanische komponente mit flexiblem drehpunkt und zeiterfassungsvorrichtung damit
CH714922A2 (fr) 2018-04-23 2019-10-31 Eta Sa Mft Horlogere Suisse Protection antichoc d'un mécanisme résonateur d'horlogerie à guidage flexible rotatif.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH705928A2 (fr) * 2011-12-22 2013-06-28 Nivarox Sa Procédé d'amélioration du pivotement d'un balancier, balancier, ensemble balancier-spiral, mouvement et pièce d'horlogerie.
EP2911012A1 (de) 2014-02-20 2015-08-26 CSEM Centre Suisse d'Electronique et de Microtechnique SA - Recherche et Développement Oszillator einer Uhr
EP3356690A1 (de) 2015-09-29 2018-08-08 Patek Philippe SA Genève Mechanische komponente mit flexiblem drehpunkt und zeiterfassungsvorrichtung damit
EP3324246A1 (de) 2016-11-16 2018-05-23 The Swatch Group Research and Development Ltd Schutz eines plattenresonator-mechanismus gegen axiale stosseinwirkungen
CH714922A2 (fr) 2018-04-23 2019-10-31 Eta Sa Mft Horlogere Suisse Protection antichoc d'un mécanisme résonateur d'horlogerie à guidage flexible rotatif.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4286959A1 (de) 2022-06-02 2023-12-06 Patek Philippe SA Genève Oszillator einer uhr mit flexiblem zapfen

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