EP3929667A1 - Mobiles drehsystem eines uhrwerks - Google Patents

Mobiles drehsystem eines uhrwerks Download PDF

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Publication number
EP3929667A1
EP3929667A1 EP20182671.6A EP20182671A EP3929667A1 EP 3929667 A1 EP3929667 A1 EP 3929667A1 EP 20182671 A EP20182671 A EP 20182671A EP 3929667 A1 EP3929667 A1 EP 3929667A1
Authority
EP
European Patent Office
Prior art keywords
pivot
cavity
axis
contact
mobile system
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
EP20182671.6A
Other languages
English (en)
French (fr)
Inventor
M. Jean-Luc HELFER
M. Dominique LECHOT
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 EP20182671.6A priority Critical patent/EP3929667A1/de
Priority to US17/338,126 priority patent/US20210405588A1/en
Priority to JP2021099957A priority patent/JP7206330B2/ja
Priority to KR1020210078547A priority patent/KR20220000826A/ko
Priority to CN202110708428.1A priority patent/CN113848693B/zh
Publication of EP3929667A1 publication Critical patent/EP3929667A1/de
Pending legal-status Critical Current

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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
    • G04B31/02—Shock-damping bearings
    • G04B31/04—Shock-damping bearings with jewel hole and cap jewel
    • 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
    • G04B1/00—Driving mechanisms
    • G04B1/10—Driving mechanisms with mainspring
    • G04B1/16—Barrels; Arbors; Barrel axles
    • 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
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • 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
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/063—Balance construction
    • 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
    • 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
    • G04B33/00—Calibers
    • 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
    • G04B37/00—Cases
    • G04B37/04—Mounting the clockwork in the case; Shock absorbing mountings
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/004—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor characterised by the material used
    • G04B31/008—Jewel bearings
    • G04B31/0082—Jewel bearings with jewel hole and cap jewel

Definitions

  • the present invention relates to a rotating mobile system of a watch movement, in particular a resonator mechanism.
  • the invention also relates to a watch movement provided with such a mobile system.
  • the axes of the rotating wheels In watch movements, the axes of the rotating wheels generally have pivots at their ends, which rotate in bearings mounted in the plate or in bridges of a watch movement.
  • the bearings For certain mobiles, in particular the balance, it is customary to equip the bearings with a shock-absorbing mechanism. Indeed, as the pivots of the axis of a balance are generally thin and the mass of the balance is relatively high, the pivots can break under the effect of a shock in the absence of a damping mechanism.
  • the configuration of a conventional shock absorbing bearing 1 is represented by the figure 1 .
  • a domed olive stone 2 is driven into a bearing support 3 commonly called chaton, on which is mounted a counter-pivot stone 4.
  • the chaton 3 is held in abutment against the bottom of a bearing block 5 by a damping spring 6 arranged to exert an axial stress on the upper part of the counter-pivot stone 4.
  • the chaton 3 further comprises a conical outer wall arranged in correspondence with a conical inner wall disposed at the periphery of the bottom of the bearing block 5.
  • the kitten comprises an outer wall having a convex surface, that is to say convex.
  • the friction torque on the axis due to the weight of the mobile varies as a function of the orientation of the mobile with respect to the direction of gravity.
  • These variations in the friction torque can in particular cause a variation in the amplitude of oscillation for the balance.
  • the weight of the mobile rests on the stones with holes, and the friction force generated by the weight has a lever arm relative to the axis, which is equal to the radius of the pivot.
  • the axis of the mobile is parallel to the direction of gravity, it is the end of the pivot on which the weight of the mobile rests.
  • the bearing comprises a counter-pivot 7 of the crapaudine type, comprising a cavity 8 in the form of a cone to receive a pivot 12 of the axis 9 of the rotating mobile, the bottom of the cavity being formed by the top 11 of the cone.
  • the pivot 12 is also tapered to fit into the cavity 8, but the solid angle of the pivot 12 is smaller than that of the cone of the cavity 8.
  • An aim of the invention is therefore to provide a mobile system of a watch movement which avoids the aforementioned problem.
  • the invention relates to a mobile system comprising a rotating mobile, for example a balance, a first and a second bearing, in particular shock absorbers, for a first and a second pivot of the axis of the rotating mobile, the system comprising a center of mass in a position of its axis, the first bearing comprising a counter-pivot comprising a main body provided with a conical cavity configured to receive the first pivot of the axis of the rotating mobile, the first pivot being able to cooperate with the cavity of the counter-pivot in order to be able to rotate in the cavity, at least one contact zone between the first pivot and the cavity being generated, the normals of the contact zone forming a minimum contact angle relative to the plane perpendicular to the axis of the pivot.
  • a rotating mobile for example a balance
  • a first and a second bearing in particular shock absorbers
  • the system is remarkable in that the minimum contact angle is less than or equal to 30 °, preferably less than or equal to arctan 1 2 , which is substantially equal to 26.6 °.
  • the variation in friction between the horizontal and vertical positions with respect to gravity is reduced.
  • a minimum contact angle less than or equal to 30 °, or even less than or equal to arctan 1 2
  • the friction torque due to the weight in contact between the pivots and the cavities of the bearings is substantially the same regardless of the direction of gravity. In fact, such an angle makes it possible to compensate for the variations in contact force due to the change in orientation with respect to gravity by lever arms of the different friction force on the two bearings.
  • this configuration of the counter-pivot makes it possible to keep a small variation in the friction torque of the pivots inside the counter-pivots, whatever the position of the axis with respect to the direction of gravity, which is by important example for a balance axis of a movement of a timepiece.
  • the cone shape of the cavity, as well as that of the pivot minimize the difference in friction torque between the different positions of the axis with respect to the direction of gravity.
  • the second bearing cooperates with the second pivot to allow the rotating mobile device to rotate about its axis
  • the second bearing comprising a second cavity
  • the second pivot being able to cooperate with the second cavity of the counter-pivot in order to be able to rotate in the second cavity, at least a second contact zone between the second pivot and the second cavity being generated, the normals of the second contact zone forming a second minimum contact angle with respect to the plane perpendicular to the axis of the second pivot, the minimum contact angles of the two pivots and of the two bearings being defined by the following equation: cot ⁇ h + cot ⁇ b ⁇ 2.5, preferably cot ⁇ h + cot ⁇ b ⁇ 3, or even cot ⁇ h + cot ⁇ b ⁇ 4.
  • the second minimum contact angle ⁇ b is greater than or equal to arctan 1 2 .
  • the contact zone or zones go around the pivot and the cavity around the axis of the balance.
  • the first pivot has a conical shape.
  • the first pivot has a convex portion and the cavity has a concave portion, part of each portion forming the contact zone.
  • the first pivot has a concave portion and the cavity has a convex portion, a part of each portion forming the contact zone.
  • the first pivot has a convex portion and the cavity has a convex portion, a part of each portion forming the contact zone.
  • the two minimum contact angles are equal.
  • the end of the pivot is defined by the intersection between the normal in contact and the axis of the pivot.
  • the pivots have a rounded end.
  • the rounded ends of the two pivots have identical radii.
  • the invention also relates to a watch movement comprising a plate and at least one bridge, said plate and / or the bridge comprising such a mobile system.
  • the bearing serves to maintain an axis of a rotating mobile, for example a balance axis, by allowing it to perform rotations around its axis.
  • the watch movement generally comprises a plate and at least one bridge, not shown in the figures, said plate and / or the bridge comprising an orifice, the movement further comprising a rotating mobile and a bearing inserted in the orifice.
  • the figures 3 and 4 show a rotating mobile system provided with a balance 13 and a spiral spring 24, the balance 13 comprising an axis 16.
  • the axis 16 comprises a pivot 15, 17 at each end.
  • Each level 18, 20 comprises a cylindrical bearing block 83 provided with a housing 14, a counter-pivot 22 arranged in the housing 14, and an opening 19 made in one face of the bearing 18, 20, the opening 19 leaving a passage for inserting the pivot 15, 17 in the bearing up to the counter-pivot 22.
  • the counter-pivot 22 is mounted on a bearing support 23 and comprises a main body provided with a cavity configured to receive the pivot 15, 17 of the axis 16 of the rotating mobile.
  • the pivots 15, 17 of the axis 16 are inserted into the housing 14, the axis 16 being maintained while being able to rotate to allow the movement of the rotating mobile.
  • the two bearings 18, 20 are shock absorbers, and further include an elastic support 21 of the counter-pivot 22 to absorb shocks and prevent the pin 16 from breaking.
  • An elastic support 21 is for example a flat spring with axial deformation on which the counter-pivot 22 is assembled.
  • the elastic support 21 is fitted into the housing 14 of the bearing block 13 and it maintains the counter-pivot 22 in the housing 14. Thus, when the timepiece is subjected to a violent impact, the elastic support 21 absorbs the shock and preserves the impact. axis 16 of the rotating mobile.
  • the pivot 15, 17 has the shape of a first substantially circular cone 26 having a first opening angle 31.
  • the opening angle 31 is the half-angle formed inside the cone by its outer wall.
  • the cavity 28 of the counter-pivot 22 has the shape of a second cone having a second opening angle 32 at the top. So that the pivot 15, 17 can rotate in the cavity, the second opening angle 32 is greater than the first opening angle 31 of the first cone 26.
  • the pivot 15, 17 and the cavities 28 cooperate to form a contact zone 29.
  • the contact zone 29 is defined by the parts of the second cone and of the pivot 15, 17 which are in contact.
  • the contact zone 29 goes around the pivot 15, 17 and the cavity 28.
  • the normals to the contact zone 29 are straight lines perpendicular to the contact zone 29.
  • the normals form a minimum angle, called the minimum contact angle, with respect to the plane perpendicular to the axis of the pivot.
  • the minimum contact angle is less than or equal to 30 °, preferably less than or equal to arctan 1 2 .
  • the normal corresponds to the line perpendicular to the wall of the second cone, that is to say the cone of the cavity 28.
  • M fr, max respectively M fr, min , the maximum friction torque, respectively minimum, on all the angles ⁇ considered (either the whole range [0 °, 180 °] in the case of O 1 , or the 3 values 0 °, 90 ° and 180 ° in the case of O 2 ).
  • ⁇ M Fr , max - M Fr , min M Fr , min
  • the first cones of the two pivots 15, 17 can have different opening angles. But if they meet this relationship, the variation in friction between the vertical and horizontal positions is reduced compared to other geometries of pivots and cavities. In this case, the relative variation in torque ⁇ is 41%.
  • the graph of the figure 7 shows the optimum contact angles for the two bearings and pivots for each position of the center of mass on the balance axis.
  • the desirable opening angle for cones is about 53.2 °.
  • the contact angles of the two bearing-pivot pairs are different.
  • Each optimum contact angle is within a range of 14 ° to 90 °.
  • the smallest contact angle is that of the pivot closest to the center of mass.
  • the graph of the figure 8 shows the difference in the optimal radii of the ends of the two pivots as a function of the position of the center of mass.
  • the radii are preferably equal for both ends.
  • the graphics of figures 10 and 11 show how the optimal angles and the variation vary as a function of the relative position of the center of mass. Also in this case, there is always one of the two angles with a value less than or equal to arctan 1 2 and the other angle with a value greater than or equal to arctan 1 2 .
  • the friction torque varies for angles different from these 3 values.
  • the graph of the figure 13 shows the variation of the optimal angles as a function of the relative position of the center of mass for this configuration.
  • An example of torque variation as a function of the orientation ⁇ is shown on the graph of the figure 14 .
  • the minimum contact angles of the two pivots and of the two bearings verify the following equation: cot ⁇ b + cot ⁇ h ⁇ 12.
  • the first pivot 33 has a convex portion 37 and the cavity 35 has a convex portion 38, a part of each portion forming the contact zone 41.
  • the cavity 35 comprises a bottom 39, then a first flared portion 42 extending from the bottom 39, the convex portion 38 is connected to the first flared portion 42, and a second flared portion 65 extends from the convex potion 38 to a cylindrical wall 66 of the cavity 35.
  • the second flared portion 65 is more wide than the first 42.
  • the portion convex 38 has a rounded shape oriented towards the interior of the cavity 35.
  • the pivot 33 has a rounded point 40 at its end, then a convex portion 37 extending from the point 40, and a conical portion 71 extending from the convex portion 37 to a cylindrical portion 72 of the pivot 33.
  • the pivot 33 is inserted into the cavity 35, the dimensions of the pivot 33 and of the cavity 35 being such that the convex portion 37 of the pivot 33 is in contact with the convex portion 38 of the cavity 35.
  • the two convex portions 37, 38 in contact define the contact zone 41. Only a part of each convex portion 37, 38 is in contact with one another.
  • the contact zone 41 is made here above the first flared portion 42 to promote a smaller minimum contact angle.
  • the normals of the contact zone 41 around the pivot 33 form a minimum contact angle with the plane perpendicular to the pivot, this minimum angle corresponds to a case corresponding to the preceding equations according to the invention, for example here of 25 °.
  • the first pivot 43 has a convex portion 47 and the cavity 45 has a concave portion 48.
  • the cavity 45 comprises a bottom 49, then a first flared portion 52 extending from the bottom 49, the concave portion 48 is connected to the bottom.
  • first flared portion 52, and a second flared portion 67 extends from the convex potion 48 to a cylindrical wall 68 of the cavity.
  • the second flared portion 67 is wider than the first 52.
  • the concave portion 48 has a rounded shape oriented towards the outside of the cavity 45.
  • the pivot 43 comprises a rounded protuberance 50 at its end, a convex portion 47 connected to the protuberance 50 by a flared portion 75, the convex portion 47 being connected to a cylindrical portion 68 of the pivot 43.
  • the pivot 43 is inserted into the cavity 45, the dimensions of the pivot 43 and of the cavity 45 being such that the convex portion 47 of the pivot 43 is in contact with the concave portion 48 of the cavity 45.
  • the two convex 47 and concave 48 portions in contact define the contact zone 51. Only a part of each convex 47 or concave 48 portion is in contact with one another.
  • the contact zone 51 is made here below the second flared portion 67 to promote a smaller minimum contact angle.
  • the normals of the contact zone 51 around the pivot 43 form a minimum contact angle with the plane perpendicular to the pivot 43, this minimum angle corresponds to a case corresponding to the preceding equations according to the invention, for example here of 25 °.
  • the first pivot 53 has a concave portion 57 and the cavity 55 has a convex portion 58, a part of each portion forming the contact zone 61.
  • the pivot 53 has a concave portion 57 and the cavity 55 has a convex portion 58.
  • the cavity 55 comprises a bottom 59, then a first cylindrical portion 62 extending from the bottom 59, the convex portion 58 being connected to the first portion cylindrical 62, and a flared portion 69 extends from the convex potion 58 to a cylindrical wall 70 of the cavity 55.
  • the convex portion 58 has a rounded shape oriented towards the interior of the cavity 55.
  • the pivot 53 comprises a rounded end 60, a concave portion 57 connected to the rounded end 60 on the one hand, and to a cylindrical portion 70 of the pivot 53 on the other hand.
  • the pivot 53 is inserted into the cavity 55, the dimensions of the pivot 53 and of the cavity 55 being such that the concave portion 57 of the pivot 53 is in contact with the convex portion 58 of the cavity 55.
  • the two convex 58 and concave portions 57 in contact define the contact zone 61. Only a part of each convex 58 or concave 57 portion is in contact with one another.
  • the contact zone 61 is made here above the cylindrical portion 62 of the cavity 55 to promote a smaller minimum contact angle.
  • the normals of the contact zone 61 around the pivot 53 form a minimum angle of contact with the plane perpendicular to the pivot 53, this minimum angle corresponds to a case corresponding to the preceding equations according to the invention, for example here of 25 °.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sliding-Contact Bearings (AREA)
  • Pivots And Pivotal Connections (AREA)
EP20182671.6A 2020-06-26 2020-06-26 Mobiles drehsystem eines uhrwerks Pending EP3929667A1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP20182671.6A EP3929667A1 (de) 2020-06-26 2020-06-26 Mobiles drehsystem eines uhrwerks
US17/338,126 US20210405588A1 (en) 2020-06-26 2021-06-03 Rotary wheel set system of a horological movement
JP2021099957A JP7206330B2 (ja) 2020-06-26 2021-06-16 計時器用ムーブメントのロータリー車セットシステム
KR1020210078547A KR20220000826A (ko) 2020-06-26 2021-06-17 시측 무브먼트의 회전 휠 세트 시스템
CN202110708428.1A CN113848693B (zh) 2020-06-26 2021-06-25 钟表机芯的旋转轮组系统

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20182671.6A EP3929667A1 (de) 2020-06-26 2020-06-26 Mobiles drehsystem eines uhrwerks

Publications (1)

Publication Number Publication Date
EP3929667A1 true EP3929667A1 (de) 2021-12-29

Family

ID=71266374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20182671.6A Pending EP3929667A1 (de) 2020-06-26 2020-06-26 Mobiles drehsystem eines uhrwerks

Country Status (5)

Country Link
US (1) US20210405588A1 (de)
EP (1) EP3929667A1 (de)
JP (1) JP7206330B2 (de)
KR (1) KR20220000826A (de)
CN (1) CN113848693B (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942848A (en) * 1973-04-06 1976-03-09 Seitz S.A. Shock absorbing pivot bearing for rotary watch parts
EP1986059A1 (de) * 2007-04-26 2008-10-29 ETA SA Manufacture Horlogère Suisse Schwenkenvorrichtung einer Welle in einer Uhr
CH715419A2 (fr) * 2018-10-11 2020-04-15 Richemont Int Sa Palier pour pièce horlogère et procédé pour la fabrication d'un tel palier.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4830445A (de) * 1971-08-24 1973-04-21
CH705861A2 (fr) * 2011-12-12 2013-06-14 Swatch Group Res & Dev Ltd Palier antichoc pour pièce d'horlogerie.
CH707501A2 (fr) * 2013-01-22 2014-07-31 Montres Breguet Sa Dispositif de guidage d'arbre d'horlogerie.
CH712502A2 (fr) * 2016-05-18 2017-11-30 Montres Breguet Sa Dispositif antichoc pour un mouvement horloger.
EP3671368B1 (de) * 2018-12-20 2022-11-23 The Swatch Group Research and Development Ltd Lager, insbesondere zur stossdämpfung, und drehteil eines uhrwerks

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942848A (en) * 1973-04-06 1976-03-09 Seitz S.A. Shock absorbing pivot bearing for rotary watch parts
EP1986059A1 (de) * 2007-04-26 2008-10-29 ETA SA Manufacture Horlogère Suisse Schwenkenvorrichtung einer Welle in einer Uhr
CH715419A2 (fr) * 2018-10-11 2020-04-15 Richemont Int Sa Palier pour pièce horlogère et procédé pour la fabrication d'un tel palier.

Also Published As

Publication number Publication date
KR20220000826A (ko) 2022-01-04
JP7206330B2 (ja) 2023-01-17
US20210405588A1 (en) 2021-12-30
CN113848693A (zh) 2021-12-28
JP2022008177A (ja) 2022-01-13
CN113848693B (zh) 2023-07-25

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