Device for regulating the motion of a mechanical horological movement

Patent metadata

Field	Value
Publication number	US-10001753-B2
Application number	US-201515509995-A
Country	US
Kind code	B2
Filing date	Sep 4, 2015
Priority date	Sep 9, 2014
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

A device regulating motion of a mechanical horological movement includes: a frame; a resonator attached to the frame and including a first annular magnetic structure including N 1 magnets arranged regularly in a circle and a resilient structure; a second annular magnetic structure including N 2 magnets defining a central axis about which the structure rotates, N 2 being different than N 1 . The resonator is configured so that a resonant mode in which the first magnetic structure is subject to curvilinear, or substantially circular, translation about the central axis may be excited by rotation of the second magnetic structure. The two magnetic structures define a magnetic cycloid gear such that the regulating device incorporates a reducer of frequency between the resonance frequency and the rotational frequency of the second magnetic structure which is rigidly connected to an escapement wheel.

First claim

The invention claimed is:

1. A device for regulating motion of a mechanical horological movement, the regulating device comprising:
a frame;
a resonator attached to the frame and comprising a first annular periodic magnetic structure including a first whole number N 1 of angular periods and which defines a first central axis, the first magnetic structure forming an inertial portion of the resonator;
a second annular periodic magnetic structure including a second whole number N 2 of angular periods and which defines a second central axis, the second number N 2 being different from the first number N 1 , the second magnetic structure being configured to rotate relative to the frame about the second central axis which has a determined position relative to the frame;
wherein at least one magnetic structure from among the first and second magnetic structures includes magnetized material in each of the angular periods thereof;
the resonator is configured to have a resonant mode in which the first magnetic structure is subject to a curvilinear translation relative to the frame about the second central axis with a resonance frequency F 1 ;
the first and second magnetic structures are configured to have a magnetic interaction between them such that a rotation at a frequency F 2 of the second magnetic structure relative to the frame and about the second central axis, by application of torque within a useful torque range, allows the resonant mode to be excited and such that the frequency F 2 of the relative rotation of the second magnetic structure and the resonance frequency F 1 have between them, within the useful torque range, a given relationship R Fr , that is R Fr =F 1 /F 2 , which is equal to the second whole number N 2 divided by the difference ΔN between the second whole number N 2 and the first whole number N 1 , such that ΔN=N 2 −N 1 and R Fr =N 2 /ΔN.

2. An horological regulating device according to claim 1 , wherein the resonator comprises a resilient structure connecting the first magnetic structure to the frame, the resilient structure being configured so that the first magnetic structure has a rest position in which the first and second central axes are substantially merged, and to apply a return force substantially in a direction of the second central axis whatever the angular position of the first magnetic structure relative to the second central axis.

3. The horological regulating device according to claim 2 , wherein return force of the resilient structure is substantially isotropic and substantially proportional to the distance between the first and second central axes.

4. A regulating device according to claim 2 , wherein the relationship R Fr is greater than five, R Fr >5.

5. The regulating device according to claim 2 , wherein the first magnetic structure comprises a first plurality of magnets distributed regularly in a circle and of which the number is equal to the number N 1 , and the second magnetic structure comprises a second plurality of magnets distributed regularly in a circle and of which the number is equal to the number N 2 .

6. The regulating device according to claim 5 , wherein the second plurality of magnets is arranged in repulsion relative to the first plurality of magnets.

7. The regulating device according to claim 1 , wherein the first and second magnetic structures are arranged in two general parallel planes that are distant from one another.

8. The regulating device according to claim 7 , wherein magnetized material of the at least one magnetic structure is magnetized axially.

9. The regulating device according to claim 7 , further comprising a third magnetic structure which has a similar configuration to the first or second magnetic structure, the two similar magnetic structures being aligned in the direction defined by the first central axis or the second central axis respectively and arranged on both sides of the different magnetic structure at substantially a same distance therefrom.

10. The regulating device according to claim 1 , wherein the first and second magnetic structures are arranged in a same general plane, one of the first and second magnetic structures being situated inside the other; and magnetized material of the at least one magnetic structure is magnetized radially.

11. The regulating device according to claim 2 , wherein the second magnetic structure forms an escapement wheel to which the torque is applied.

12. The regulating device according to claim 2 , wherein the frame forms an escapement wheel to which the torque is applied.

13. The regulating device according to claim 1 , further comprising a mechanical anti-loss-of-synchronization system between the first and second magnetic structures including a planetary gear with a planet wheel including a first set of teeth and rotating inside a crown provided internally with a second set of teeth,
the planet wheel being associated with the structure that has a lower number of angular periods from among the first and second magnetic structures and the crown being associated with the other structure that has a higher number of angular periods;
wherein the structure associated with the second magnetic structure is rigidly connected in rotation to the second structure;
wherein the mechanical anti-loss-of-synchronization system is configured so that, at least in an upper zone of the useful torque range of which the higher value defines the maximum value of the useful range, the first and second sets of teeth penetrate one another at least in part; and
wherein the first and second sets of teeth are configured and configured relative to one another so that, within the useful range, the first and second sets of teeth do not touch one another, coupling between the first and second magnetic structures being purely magnetic within the useful range.

14. The regulating device according to claim 13 , wherein the relationship R Z between a number Z 1 of teeth of the set of teeth of the crown and a number Z 2 of teeth of the set of teeth of the planet wheel is equal to the relationship R M * between the higher number of angular periods and the lower number of angular periods.

15. The regulating device according to claim 13 , wherein the mechanical anti-loss-of-synchronization system is configured so that the first and second sets of teeth penetrate one another at least in part without touching each other over the entire useful torque range.

16. The regulating device according to claim 13 , wherein the useful torque range is a first useful range of purely magnetic coupling of the first and second magnetic structures, the maximum value of the first useful range being less than a loss-of-synchronization value of the purely mechanical coupling,
wherein the regulating device comprises a second useful torque range, greater than the first useful range and contiguous thereto, corresponding to a useful range of magneto-mechanical coupling in which the first and second sets of teeth mesh with one another so that one applies a mechanical driving torque to the other;
wherein the first and second sets of teeth are configured and configured relative to one another so that, at least in a lower zone of the second useful range of which the lower value defines the minimum value of the second useful range, the first and second sets of teeth have some radial play allowing an increase of amplitude of the curvilinear translation of the first magnetic structure during an increase in the torque; and
wherein the resilient structure is configured to have substantially resilient deformation in the first and second useful ranges

Assignees

• Eta Sa Mft Horlogere Suisse

Inventors

• Winkler Pascal
• Di Domenico Gianni
• Born Jean-Jacques

Classifications

• G04C3/08

  wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork {, e.g. electrostatically} · CPC title

• G04C5/005 Primary

  Magnetic or electromagnetic means · CPC title

• G04B17/32

  Component parts or constructional details, e.g. collet, stud {, virole or piton} · CPC title

• H02K49/10

  of the permanent-magnet type · CPC title

• G04B18/02

  Regulator {or adjustment} devices; Indexing devices {, e.g. raquettes} · CPC title