Timekeeping mechanism with magnetic gears

Abstract

This invention relates to a timekeeping mechanism equipped with a magnetic gear. The mechanism (1) includes a magnetic gear (2), which comprises a first wheel (6B) and a second wheel (6C) respectively provided with a first magnetic gear system (10) and a second magnetic gear system (12). The first and second magnetic gear systems are formed by first and second teeth made of soft ferromagnetic material, respectively; and the magnetic gear (2) also includes a third wheel (6A), which is arranged between the first and second wheels (6B, 6C) and is provided with a third magnetic gear system (8) formed by permanent magnet poles (especially bipolar magnets). Generally, the first wheel is the driving wheel, while the second wheel is driven to perform a function or transmit torque. The third intermediate wheel is preferably mounted so that it can rotate freely.

Description

Technical Field

[0001] This invention relates to the field of magnetic gears formed by a first wheel and a second wheel that are magnetically meshed with each other.

[0002] In particular, the present invention relates to mechanisms incorporating such magnetic gears, especially timekeeping mechanisms. Background Technology

[0003] Magnetic gears are known devices that can be used to transmit mechanical torque between two components without any direct contact between the components, and therefore do not cause wear or friction between the components. Such gears have the following advantages:

[0004] - Since there is no mechanical wear on the teeth of the component, no oil or lubricant is required;

[0005] - Toothed components can interact and transmit torque and mechanical power, even when they are sealed apart; and

[0006] - Toothed components can be used to limit maximum torque and thus help avoid damage, such as in the event of mechanical shock.

[0007] Such magnetic gears typically consist of two wheels that are magnetically meshed with each other. The first wheel has first permanent magnet poles, which are usually alternate and arranged in a circle, defining a first magnetic gear system. For example, these first magnetic poles are defined by bipolar magnets with radial and alternating magnetization. The second wheel has teeth or second magnetic poles made of ferromagnetic material, which are arranged in a circle and define a second magnetic gear system. The first and second wheels are usually located in the same general plane. The magnetic coupling between the gear systems of the first and second wheels means that when one of the first and second wheels is driven to rotate, the other wheel is also driven to rotate due to magnetic meshing.

[0008] However, a drawback of this type of magnetic gear is that it requires each tooth of the first gear to be magnetized (through permanent magnetization), typically in an alternating magnetization manner. This leads to two significant consequences: first, such magnetic gears are expensive to manufacture; and second, even if the amount of interaction required between the two gears is relatively small, the rotating magnet will generate significant magnetic field lines through the system containing the magnetic gear (typically a timepiece mechanism). However, it is difficult to confine such magnetic field lines to protect other components of the system from their effects. Such effects can impair the proper operation of the system, especially when the system is the movement of a timepiece mechanism. Summary of the Invention

[0009] Therefore, the present invention aims to overcome the disadvantages of the prior art by providing a mechanism (in particular a timekeeping mechanism) that includes a magnetic gear that is simple and inexpensive to manufacture, and which allows for a reduction in the number of permanent magnet poles required by the magnetic gear, and enables the limitation of magnetic field lines to protect a wide variety of other components of the system containing the mechanism.

[0010] For this purpose, the present invention relates to a mechanism, particularly a timekeeping mechanism, comprising a magnetic gear, the magnetic gear including a first wheel and a second wheel respectively provided with a first magnetic tooth system and a second magnetic tooth system. According to the invention, the first and second magnetic tooth systems are respectively formed by first and second teeth made of a soft ferromagnetic material; and the magnetic gear further includes a third wheel disposed between the first and second wheels and provided with a first permanent magnet pole, the first permanent magnet pole forming magnetized teeth of the third magnetic tooth system included in the third wheel, and the third magnetic tooth system is configured such that a first magnetic flux having alternating polarities emerges from these magnetized teeth respectively. The third wheel and the first wheel are arranged such that the third magnetic tooth system has a first magnetic coupling with the first magnetic tooth system generated by the first magnetic flux, the first magnetic flux temporarily polarizing the teeth of the first magnetic tooth system in the form of magnetic attraction such that these teeth are temporarily located in the first magnetic coupling region with the third magnetic tooth system, and thus the first magnetic flux from the first magnetic flux passes through these teeth respectively. The third and second wheels are arranged such that the third magnetic tooth system, or, where applicable, the fourth magnetic tooth system, has a second magnetic coupling with the second magnetic tooth system, which is comprised of the third wheel and formed by second permanent magnet poles having alternating polarities from which a second magnetic flux originates. This second magnetic coupling is generated by either the first or the second magnetic flux, which temporarily polarizes the teeth of the second magnetic tooth system in the form of magnetic attraction. These teeth are temporarily located in the second magnetic coupling region with the third magnetic tooth system (8), or, where applicable, with the fourth magnetic tooth system, and thus a first magnetic flux from the first magnetic flux passes through these teeth, or a second magnetic flux from the second magnetic flux passes through these teeth. The soft ferromagnetic material is preferably a material with high permeability and therefore low magnetic resistance.

[0011] Such a magnetic gear mechanism, constructed in this way, generates local and temporary magnetization only on the teeth of the first and second gear trains, which are made of soft ferromagnetic material and are located in the respective magnetic coupling regions and are active at a given moment in time. The number of permanent magnet poles of the third gear required to generate such local magnetization is thus significantly reduced. This allows for reduced costs and simplified manufacturing of the mechanism, and allows the magnetic field lines near the location where torque transmission occurs between the first and second gears to be confined to a localized state. The presence of teeth made of soft ferromagnetic material on the first and second gears also allows for the closure of the magnetic field lines generated by the permanent magnet poles of the third gear. Therefore, a wide variety of components of the system containing the mechanism (such as, for example, the movement of a timepiece) are advantageously protected against the generated magnetic field.

[0012] Furthermore, such a mechanism according to the invention inherently limits the maximum torque transmitted between the first and second gears, thereby protecting the gears from damage caused by mechanical shocks.

[0013] Preferably, the third magnetic tooth system includes at least four magnetized teeth, particularly between four and ten (including endpoint values). Similarly, when provided in the embodiments, the fourth magnetic tooth system includes at least four magnetized teeth, particularly between four and ten (including endpoint values).

[0014] According to a preferred embodiment of the invention, the third wheel is mounted to allow it to rotate freely. This third wheel is configured to transmit torque received from the first wheel to the second wheel to perform the function of the mechanism or to transmit torque received from the first wheel within the mechanism. In the magnetic gear system, the first wheel is the drive wheel, and the second wheel is driven by the first wheel via the third wheel. The magnetic coupling between the first and second wheels is therefore an indirect coupling, both on the one hand between the first and third wheels and on the other hand between the second and third wheels, via the first and second magnetic couplings (intermediate couplings).

[0015] The first magnetic tooth system comprises N1 teeth, the second magnetic tooth system comprises N2 teeth, and the third magnetic tooth system comprises N3 teeth. Advantageously, the number N3 is an even number between four and ten (including endpoint values); and the ratio between the number N1 and the number N3, as well as the ratio between the number N2 and the number N3, are each greater than or equal to two, preferably greater than or equal to three. For a finite number of magnets, this improves the efficiency of magnetic coupling between the first, second, and third gears.

[0016] In some embodiments where a fourth magnetic tooth system is provided, the fourth magnetic tooth system comprises N4 teeth. In an advantageous alternative embodiment, the number N4 is equal to the number N3. However, the number N4 may intentionally differ from the number N3. In an advantageous embodiment including a fourth tooth system, the magnetized teeth of the third magnetic tooth system are formed by the first poles of a plurality of bipolar magnets, while the magnetized teeth of the fourth magnetic tooth system are formed by the second poles of the plurality of bipolar magnets, which are physically separated from the first poles. In particular, the third wheel comprises N bipolar magnets, and the number N is equal to both the number N3 and the number N4 (N=N3=N4). It should be noted that N bipolar magnets have 2N poles by definition.

[0017] According to a specific embodiment of the invention, the third wheel includes the fourth magnetic tooth system, and the first and second wheels extend in substantially perpendicular planes. The third wheel extends in a plane configured to be substantially 45 degrees (45°) with both the plane in which the first wheel extends and the plane in which the second wheel extends. Each of the first permanent magnet poles, together with a second permanent magnet pole from the second permanent magnet pole, forms a bipolar magnet with axial magnetization. The first, second, and third wheels are positioned such that one or more bipolar magnets coupled to the first magnetic tooth system are simultaneously coupled to the second magnetic tooth system.

[0018] In a general alternative embodiment, each of the first and second wheels includes at least six teeth that extend radially relative to the axis of rotation of the wheel in question. Each tooth takes the form of a protrusion projecting from the annular periphery of the wheel. In particular, each of the first and second wheels includes between six and thirty teeth that extend radially relative to the axis of rotation of the wheel.

[0019] When each of the plurality of bipolar magnets has radial polarization, advantageously, the third wheel has a central portion made of ferromagnetic material, around which the plurality of bipolar magnets are arranged and whose outer magnetic poles respectively define the magnetized teeth of the third magnetic tooth system. This allows the magnetic field lines, particularly between adjacent bipolar magnets, to be effectively closed on the inner magnetic pole side of the plurality of bipolar magnets via the central portion of the third wheel.

[0020] Advantageously, the first and / or second wheel includes a rim that forms a continuous annular base for the corresponding magnetic gear system, the rim being made of a soft ferromagnetic material to form a closure of a magnetic circuit for a closed magnetic flux.

[0021] In a specific alternative embodiment, the mechanism also includes a check valve mechanically coupled to the second wheel. This prevents the wheel from slipping backward, which can occur, in particular, with a high restoring torque, such as, for example, when the mainspring is wound. More specifically, such slippage can lead to a runaway effect detrimental to the mechanism, causing the second wheel to rotate freely in the direction opposite to the desired torque transmission direction. For example, such a runaway effect can be triggered by vibration, shock, or any other mechanical disturbance within the mechanism involved (e.g., winding of the mainspring), due to the wheel slipping backward.

[0022] According to one exemplary embodiment of the invention, at least the first and second wheels are coplanar. Specifically, the first, second, and third wheels can be coplanar. In the latter case, the third wheel is particularly formed by a plurality of bipolar magnets having radial magnetization / polarization. According to another exemplary embodiment of the invention, at least the first and second wheels extend in separate planes. Specifically, the first, second, and third wheels can each extend in separate planes. Attached Figure Description

[0023] The objectives, advantages, and features of the mechanism according to the invention will become more apparent in the following description of various non-limiting embodiments illustrated by way of the accompanying drawings, wherein:

[0024] - Figure 1 This is a top view of a mechanism incorporating a magnetic gear according to a first example of a first embodiment of the mechanism according to the present invention;

[0025] - Figure 2 It is similar to Figure 1 A view of a second example of a mechanism according to a first embodiment of the present invention;

[0026] - Figure 3 This is a perspective side view of a second embodiment of the mechanism of the present invention;

[0027] - Figure 4 It is observed along line of sight A1. Figure 3 A perspective top view of the mechanism; and

[0028] - Figure 5 It is shown Figure 3 A magnified perspective view of the features of the mechanism. Detailed Implementation

[0029] like Figures 1 to 5 As shown, the invention originates from the following general inventive concept, which includes providing two wheels 6B, 6C in a magnetic gear 2 equipped with a mechanism 1 (particularly a timekeeping mechanism), each wheel having teeth made of a soft ferromagnetic material with relatively high permeability. These two wheels 6B, 6C are magnetically coupled to a third wheel 6A, which has a smaller diameter and, in particular, a pinion-like size. The third wheel 6A has permanent magnet poles arranged circularly about its axis of rotation. Arranged between the first wheel 6B and the second wheel 6C, the third wheel 6A generates a magnetic field coupled to two corresponding portions of these wheels 6B, 6C, each portion located in a corresponding magnetic coupling region with the third wheel 6A. The first wheel 6B and the second wheel 6C are thus each magnetically engaged with the third wheel 6A, which is an intermediate wheel with a smaller diameter between the first and second wheels. This intermediate wheel generates a magnetic flux that allows for local magnetization / polarization of the first and second tooth systems, and the first and second wheels are magnetically coupled to each other in an indirect manner.

[0030] The magnetic field generated by the third wheel 6A thus produces local magnetization on each of the first wheel 6B and the second wheel 6C; more specifically, it produces local magnetization on the tooth systems of these wheels 6B and 6C made of soft ferromagnetic material, causing the teeth of these tooth systems to be sequentially and temporarily magnetized / polarized, particularly by the group of teeth that are active at a given moment, i.e., temporarily located in the magnetic engagement region with the third wheel 6A. The number of permanent magnet poles of the third wheel 6A required to generate such temporary local magnetization of the first and second tooth systems is thus significantly reduced. When one of the two wheels 6B and 6C or the third wheel 6A is driven to rotate, the other two wheels are also driven to rotate as a result of magnetic coupling in the form of attraction between the teeth of the three wheels 6A, 6B, and 6C in the two magnetic engagement regions provided for the three wheels 6A, 6B, and 6C. The magnetic field line 11 generated by the magnetic coupling between the three wheels 6A, 6B, and 6C thus locally restricts the vicinity of the location where torque transmission occurs.

[0031] Mechanism 1 may also include a check device (not shown in the figures) mechanically coupled to the second wheel 6C. For example, the check device includes a ratchet and a pawl. The ratchet is fixed to the second wheel 6C for rotation therewith and has teeth extending radially relative to the axis of rotation of the ratchet. The pawl engages with the teeth of the ratchet in such a way as to prevent the second wheel 6C from rotating in a direction opposite to the direction corresponding to the desired torque transmission. This prevents the second wheel 6C from rotating freely in that direction under vibration, shock, or any other mechanical disturbance within the timekeeping mechanism (e.g., winding of the mainspring), which could compromise its mechanical integrity.

[0032] In the following description, the elements represented by the same reference numerals are similar.

[0033] The following will refer to Figure 1 and Figure 2A first embodiment of a mechanism 1 including a magnetic gear 2 according to the present invention is described. According to this first embodiment of mechanism 1, a first wheel 6B, a second wheel 6C, and a third wheel 6A extend in the same overall plane. The third wheel 6A is mounted such that it is freely rotatable. The third wheel 6A is therefore configured to transmit torque received from the first wheel 6B to the second wheel 6C. The first wheel 6B is thus the drive wheel in the magnetic gear 2, and the second wheel 6C is driven by the first wheel 6B via the third wheel 6A to perform the function of mechanism 1 or to transmit torque received from the first wheel 6B within mechanism 1. The first wheel 6B has N1 teeth made of a soft ferromagnetic material defining a first magnetic gear system 10. The second wheel 6C has N2 teeth made of a soft ferromagnetic material defining a second magnetic gear system 12. The teeth of the second wheel 6B and the second wheel 6C are made of a soft ferromagnetic material, which preferably has high magnetic permeability, for example, a Mu alloy. The third wheel 6A has a smaller diameter than the other two wheels 6B and 6C. The third wheel 6A has N3 external permanent magnet poles 7, which are defined by the same number of bipolar magnets with radial polarization. These bipolar magnets are arranged in a circle and form the magnetized teeth of the third magnetic tooth system 8.

[0034] The first magnetic gear system 10 has a first direct magnetic coupling with the third magnetic gear system 8, such that when one of the first wheel 6B and the third wheel 6A is driven to rotate, the other wheel 6B, 6A is also driven to rotate, wherein the transmission ratio is defined by the first and third gear systems 10, 8, through the first direct magnetic coupling between the first and third gear systems 10, 8. This first direct magnetic coupling is generated by the magnetic flux of the third gear system 8, which temporarily polarizes the teeth of the first magnetic gear system 10 in the form of magnetic attraction, such that these teeth are temporarily located in the first magnetic coupling region with the third magnetic gear system 8, and therefore the magnetic flux passes through these teeth respectively.

[0035] The second magnetic gear system 12 has a second direct magnetic coupling with the third magnetic gear system 8, such that when one of the second wheel 6C and the third wheel 6A is driven to rotate, the other wheel 6C, 6A is also driven to rotate, wherein the transmission ratio is defined by the second and third gear systems through the second direct magnetic coupling between the second and third gear systems 12, 8. This second direct magnetic coupling is generated by the magnetic flux of the third gear system 8, which temporarily polarizes the teeth of the second magnetic gear system 12 in the form of magnetic attraction, such that these teeth are temporarily located in the second magnetic coupling region with the third magnetic gear system 8, and thus the magnetic flux passes through these teeth respectively. The magnetic coupling between the first wheel 6B and the second wheel 6C is therefore indirect, via the first and second direct magnetic couplings, on the one hand between the first wheel 6B and the third wheel 6A, and on the other hand between the second wheel 6C and the third wheel 6A.

[0036] The N3 permanent magnet poles 7 of the third wheel 6A form the magnetized teeth of the third magnetic tooth system 8, from which magnetic flux with alternating polarities is emitted. Since the magnetic poles 7 are arranged in a circular pattern with alternating polarization, there is an even number of magnetic poles. Preferably, the number N3 is an even number between four and ten (including endpoint values). The magnetic poles 7 are typically arranged in pairs with the same number of complementary magnetic poles, which are arranged around the central portion 9 of the axis forming the third wheel 6A or in an opening through which such axis passes, and thus together form multiple bipolar magnets. In the case where the multiple bipolar magnets have radial polarization, the central portion 9 is advantageously made of a ferromagnetic material or a Mu-alloy material. Such a material effectively closes the magnetic field lines emerging from the inner poles of the multiple bipolar magnets (especially between adjacent bipolar magnets) via the central portion of the third wheel 6A.

[0037] The number of teeth N1 of the first wheel 6B is preferably greater than the number of magnetic poles 7 N3 of the third wheel 6A. The ratio between the number of teeth N1 of the first wheel 6B and the number of magnetic poles 7 N3 of the third wheel 6A is advantageously greater than or equal to two, preferably greater than or equal to three. The number of teeth N2 of the second wheel 6C is preferably greater than the number of magnetic poles 7 N3 of the third wheel 6A. The ratio between the number of teeth N2 of the second wheel 6C and the number of magnetic poles 7 N3 of the third wheel 6A is advantageously greater than or equal to two, preferably greater than or equal to three. Preferably, each of the first wheel 6B, the second wheel 6C, and the third wheel 6A is mounted on a pivot pin in a bearing.

[0038] according to Figure 1 In a first example of a first embodiment of the mechanism 1 shown, both the first wheel 6B and the second wheel 6C include eighteen teeth made of a soft ferromagnetic material. Each tooth of the first wheel 6B and the second wheel 6C is mounted on a corresponding rim 14 made of a non-magnetic material, having a non-magnetic region between the teeth of the first tooth system 10 and a non-magnetic region between the teeth of the second tooth system 12. The third wheel 6A includes six bipolar magnets 7 with radial magnetization, which respectively form the magnetized teeth of the third magnetic tooth system 8. More specifically, the outer magnetic poles of the plurality of bipolar magnets define the magnetized teeth of the third magnetic tooth system.

[0039] according to Figure 2 In a second example of the first embodiment of the mechanism 1 shown, the first wheel 6B and the second wheel 6C each comprise annular rims made of magnetic material (typically soft ferromagnetic material), defining eighteen teeth, also made of soft ferromagnetic material, forming the first magnetic tooth system 10 and the second magnetic tooth system 12, respectively, at the outer periphery of the rims. Such annular rims form continuous circular bases for each of the first magnetic tooth system 10 and the second magnetic tooth system 12, closing the magnetic path of the interacting magnetic flux via these tooth systems. The third wheel 6A comprises six bipolar magnets having radial magnetization / polarization, and the six bipolar magnets respectively form the six magnetized teeth of the third magnetic tooth system 8.

[0040] exist Figure 1 and Figure 2 In the first two examples of the first embodiment shown, the first round 6B, the second round 6C, and the third round 6A extend collinearly in the same global plane. Alternatively, the first round 6B, the second round 6C, and the third round 6A may extend in the same global plane but not collinearly.

[0041] The following will refer to Figures 3 to 5 A second embodiment of the mechanism 1 including the magnetic gear 2 according to the present invention is described. According to this second embodiment of the mechanism 1, each of the first wheel 6B, the second wheel 6C, and the third wheel 6A extends in a separate plane. Figures 3 to 5 In the specific example embodiment shown, and not limited to this second embodiment, the first wheel 6B and the second wheel 6C extend in a substantially perpendicular plane. The third wheel 6A extends in a plane configured to be substantially 45 degrees to the plane in which the first wheel 6B extends and the plane in which the second wheel 6C extends. The third wheel 6A includes six bipolar magnets 26 defining a third magnetic tooth system 8 and a fourth magnetic tooth system 27. The third magnetic tooth system 8 is formed by a plurality of first permanent magnet poles 29 located on the first magnetic tooth system 10 side of the first wheel 6B relative to the midplane of the plurality of bipolar magnets 26. The fourth magnetic tooth system 27 is defined by a plurality of second permanent magnet poles 31 located on the second magnetic tooth system 12 side of the second wheel 6C relative to the midplane of the plurality of bipolar magnets 26. Each first permanent magnet pole 29 and its corresponding second permanent magnet pole 31 together form one of the bipolar magnets.

[0042] like Figure 5 As shown, the first wheel 6B and the second wheel 6C include the same number of teeth made of ferromagnetic material. Both wheels 6B and 6C have... Figure 2 The type shown. Each of the six bipolar magnets 26 of the third wheel 6A is magnetized along an axis parallel to the rotation axis 28 of the third wheel. The magnetized teeth 29, 31 of the third tooth system 8 and the fourth tooth system 27 are thus arranged such that the magnetic flux emerges from these magnetized teeth in a principal direction substantially parallel to the rotation axis 28 of the third wheel 6A.

[0043] In a specific embodiment (not shown in the figures), the three wheels are located in three parallel, separate planes, with the third wheel advantageously located in the intermediate plane. In this advantageous example, the third wheel includes a plurality of bipolar magnets with axial magnetization / polarization. The third magnetic tooth system of the third wheel is defined by a plurality of first permanent magnet poles, each forming a plurality of bipolar magnets and located on the side of the first magnetic tooth system of the first wheel relative to the midplane of the plurality of bipolar magnets, with the first permanent magnet poles at least partially stacked on the first magnetic tooth system. The third wheel also includes a fourth magnetic tooth system defined by a plurality of second permanent magnet poles, each forming a plurality of bipolar magnets and located on the side of the second magnetic tooth system of the second wheel, with the second permanent magnet poles at least partially stacked on the second magnetic tooth system. Thus, the number of magnetized teeth in the third magnetic tooth system and the number of magnetized teeth in the fourth magnetic tooth system are equal to each other and equal to the number of bipolar magnets carried by the third wheel.

[0044] According to another specific alternative embodiment (not shown in the figures), the first wheel 6B and the second wheel 6C extend in the same first plane, and the third wheel 6A extends in a second plane that is separate from and parallel to the first plane. In this case, the third wheel advantageously carries a plurality of bipolar magnets with axial polarization, the bipolar magnets being covered on the side opposite to the first plane by a plate made of soft ferromagnetic material, the plate closing the path of magnetic flux of the plurality of bipolar magnets on the side opposite to the first plane.

Claims

1. A mechanism (1) including a magnetic gear (2), the magnetic gear (2) comprising a first wheel (6B) and a second wheel (6C) respectively provided with a first magnetic gear system (10) and a second magnetic gear system (12); characterized in that, The first and second magnetic gear systems (10, 12) are respectively formed by first and second teeth made of soft ferromagnetic material; and wherein the magnetic gear (2) further includes a third wheel (6A), the third wheel (6A) being arranged between the first wheel and the second wheel (6B, 6C) and having a first permanent magnet pole, the first permanent magnet pole forming magnetized teeth of the third magnetic gear system (8) in the third wheel (6A), and the third magnetic gear system (8) being configured such that a first magnetic flux having alternating polarities arises from these magnetized teeth respectively; the third wheel (6A) and the first wheel (6B) are arranged such that the third magnetic gear system (8) has a first magnetic coupling with the first magnetic gear system (10) generated by the first magnetic flux, the first magnetic flux temporarily polarizing the teeth of the first magnetic gear system (10) in the form of magnetic attraction: these teeth are temporarily located in the first magnetic coupling region with the third magnetic gear system (8). In the middle, and therefore the first magnetic flux from the first magnetic flux passes through these teeth respectively; the third wheel (6A) and the second wheel (6C) are arranged such that the third magnetic tooth system (8) or the fourth magnetic tooth system (27) has a second magnetic coupling with the second magnetic tooth system (12), the fourth magnetic tooth system (27) is included by the third wheel and is formed by a second permanent magnet pole (31) having alternating polarity from which the second magnetic flux emerges, the second magnetic coupling being generated by the first magnetic flux or by the second magnetic flux respectively, the first magnetic flux or the second magnetic flux temporarily polarizing the teeth of the second magnetic tooth system (12) in the form of magnetic attraction: these teeth are temporarily located in the second magnetic coupling region with the third magnetic tooth system (8) or with the fourth magnetic tooth system (27), and therefore the first magnetic flux from the first magnetic flux passes through these teeth or the second magnetic flux from the second magnetic flux passes through these teeth respectively.

2. The mechanism (1) according to claim 1, characterized in that, The third wheel (6A) is mounted so that it can rotate freely. The third wheel (6A) is configured to transmit the torque received from the first wheel (6B) to the second wheel (6C) to realize the function of the mechanism or to transmit the torque received from the first wheel (6B) within the mechanism (1). In the magnetic gear (2), the first wheel (6B) is the drive wheel, and the second wheel (6C) is driven by the first wheel (6B) via the third wheel (6A).

3. The mechanism (1) according to claim 1 or 2, wherein, The first magnetic tooth system (10) includes N1 teeth, the second magnetic tooth system (12) includes N2 teeth, and the third magnetic tooth system (8) includes N3 teeth; characterized in that the quantity N3 is an even number between four and ten, including endpoint values; and wherein the ratio between the quantity N1 and the quantity N3 and the ratio between the quantity N2 and the quantity N3 are each greater than or equal to two.

4. The mechanism (1) according to claim 3, characterized in that, The ratio between quantity N1 and quantity N3, and the ratio between quantity N2 and quantity N3, are both greater than or equal to three.

5. The mechanism (1) according to claim 1 or 2, characterized in that, The third wheel (6A) has a central portion (9; 28) made of ferromagnetic material, on the periphery of which the first permanent magnet poles are respectively arranged in pairs with the same number of complementary magnet poles, thereby forming a bipolar magnet with radially magnetized magnetized teeth that respectively define the third magnetic tooth system.

6. The mechanism (1) according to claim 1 or 2, characterized in that, The first wheel and / or the second wheel (6B, 6C) includes a rim that forms a continuous annular base for the corresponding magnetic gear system (10, 12), the rim being made of a soft ferromagnetic material to form a closure of the magnetic circuit closing the magnetic flux.

7. The mechanism (1) according to claim 1 or 2, characterized in that, The mechanism (1) also includes a check device (20) mechanically connected to the second wheel (6C).

8. The mechanism (1) according to claim 1 or 2, characterized in that, At least the first round and the second round (6B, 6C) are coplanar.

9. The mechanism (1) according to claim 8, characterized in that, The first, second, and third rounds (6B, 6C, 6A) are coplanar.

10. The mechanism (1) according to claim 1 or 2, characterized in that, At least the first and second wheels (6B, 6C) extend in separate planes.

11. The mechanism (1) according to claim 10, characterized in that, Each of the first, second, and third rounds (6B, 6C, 6A) extends in a separate plane.

12. The mechanism (1) according to claim 11, wherein, The third wheel (6A) includes the fourth magnetic tooth system (27), characterized in that the first wheel and the second wheel (6B, 6C) extend in a vertical plane; wherein the third wheel (6A) extends in a plane that is set at 45 degrees to the plane in which the first wheel (6B) extends and the plane in which the second wheel (6C) extends; and wherein each of the first permanent magnet poles, together with the corresponding second permanent magnet pole (31) from the second permanent magnet pole (31), forms a bipolar magnet (26) with axial magnetization, the first, second and third wheels (6B, 6C, 6A) being positioned such that one or more bipolar magnets (26) coupled to the first magnetic tooth system (10) are simultaneously coupled to the second magnetic tooth system (12).

13. The mechanism (1) according to claim 12, characterized in that, The first wheel and the second wheel (6B, 6C) each include a rim, the rim forming a continuous circular base for the first magnetic tooth system (10) and the second magnetic tooth system (12) respectively, the rim being made of a soft ferromagnetic material to form a closure that closes the magnetic circuits of the first magnetic flux and the second magnetic flux respectively.

14. The mechanism (1) according to claim 1, characterized in that, The mechanism (1) is a timekeeping mechanism.

Images