EP2718769A2 - Source d'energie mecanique pour mouvement horloger a couple de sortie predefini - Google Patents
Source d'energie mecanique pour mouvement horloger a couple de sortie predefiniInfo
- Publication number
- EP2718769A2 EP2718769A2 EP12732989.4A EP12732989A EP2718769A2 EP 2718769 A2 EP2718769 A2 EP 2718769A2 EP 12732989 A EP12732989 A EP 12732989A EP 2718769 A2 EP2718769 A2 EP 2718769A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- barrel
- circular
- wheel
- drum
- satellite
- 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
Links
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
- G04B1/00—Driving mechanisms
- G04B1/10—Driving mechanisms with mainspring
- G04B1/22—Compensation of changes in the motive power of the mainspring
Definitions
- the present invention relates to a mechanism, arranged to deliver mechanical energy to a finishing gear of a watch movement in the form of a predefined output torque transmitted to a first mobile of the work train.
- This mechanism comprises a barrel spring whose one end, internal, is secured to a barrel shaft and an outer end is secured to a barrel drum, a first of these ends being intended to be kinematically connected to the first mobile the finishing gear.
- the mechanism further comprises a gear train arranged to provide a kinematic connection between the ends of the mainspring and allow a transfer of mechanical energy between them.
- Such a source of mechanical energy must have a limited footprint but, at the same time, it must be able to store enough mechanical energy to provide a satisfactory power reserve to the corresponding watch movement. Note that the amount of energy that can be stored in a barrel is directly proportional to the volume of the barrel.
- a main disadvantage of the barrel springs resides in the fact that the output torque delivered by the corresponding barrel is not stable as a function of the state of charge of the spring, that is to say at all. along the winding of the barrel.
- the barrel spring being intended to supply a mechanical resonator with mechanical energy, to maintain the oscillations by means of a finishing train, a fluctuation of the torque that it delivers causes a fluctuation of the period of the oscillations of the mechanical resonator, an undesirable variation of the accuracy of the watch movement.
- This counting mechanism controls a switch arranged to control the movements of a rocker for acting on a clutch.
- the clutch is disposed in a gear train providing a kinematic connection between the barrel drum and the barrel shaft, to allow a transfer of mechanical energy between the two ends of the mainspring, more specifically, a reinjection of the energy delivered by the drum in the mainspring through the barrel shaft.
- the clutch is either in an engaged configuration, in which a transfer mechanical energy is possible, either in a disengaged configuration, in which the transfer of mechanical energy is not possible.
- the clutch is in its engaged configuration and a portion of the mechanical energy delivered by the drum is transferred from the outer end of the mainspring to its inner end, through the gear train.
- the counting mechanism detects that the state of charge of the spring reaches a predefined low value, it is necessary to flip the scale to move the clutch into its disengaged configuration, thereby interrupting the energy transfer. From this moment, all the energy delivered by the drum is sent into the finishing gear of the watch movement.
- the mechanism described above only partially meets the problem presented above in relation to the variation of the torque delivered by the barrel. It will be noted in particular that, from the moment when the clutch is placed in its disengaged configuration, the described energy source starts operating in the same manner as a conventional energy source, that is to say ie by presenting the same progressive decay of the delivered torque. This gives two operating ranges associated with similar torque variations but respective smaller amplitudes compared to the prior art. It will also be noted that the structure of this mechanism is complex and cumbersome, not only from the point of view of the structure of the counting mechanism of the power reserve, which has arrangements in relation to the state of the art, but also in the implementation of the gear train ensuring the reinjection of mechanical energy to the barrel shaft.
- a main object of the present invention is to provide a simple structural mechanism, compact and acting directly at the source of mechanical energy, to limit as much as possible the variation of the torque delivered.
- the present invention relates more particularly to a mechanism of the type mentioned above, characterized in that the gear train comprises a planetary gear having
- the planetary gear comprises a satellite comprising a first non-circular wheel arranged in engagement with a first non-circular sun gear.
- the amount of energy reinjected from one end of the mainspring to the other can be controlled.
- the non-circular wheels may have respective peripheries such that the torque transmitted to the first mobile of the work train is substantially constant.
- the output torque is transmitted to the gear train from barrel drum, the planetary gear being arranged to allow energy transfer from the outer end of the mainspring to its inner end.
- the planetary gear preferably comprises a satellite carrier, intended to be kinematically connected to the winding mechanism and carrying the satellite whose first non-circular wheel is secured to a second satellite wheel and coaxial to this last, the first non-circular satellite wheel having a kinematic connection with the barrel drum, while the first non-circular sun wheel has a kinematic connection with the barrel shaft.
- the first non-circular solar wheel is advantageously coaxial with the barrel shaft being integral with the latter in rotation.
- the mechanism having the above characteristics makes it possible to reinject a portion of the energy delivered by the barrel drum at its shaft. Thanks to the non-circular shape of the wheels of the planetary gear, the portion of energy taken out of the drum to be reinjected can be adjusted continuously, depending on the state of charge of the mainspring and therefore, depending on the torque delivered to the finishing gear. It is thus possible to take at each moment a quantity of mechanical energy such that the torque actually delivered to the work train is substantially constant.
- the mechanism preferably comprises a second sun gear rotationally integral with the barrel drum and arranged in engagement with the second satellite wheel.
- the sun gear may further be arranged to allow energy transfer from the inner end of the mainspring to its outer end or the finishing gear.
- the drum drum advantageously defines a planet carrier of the planetary gear, the latter bearing the satellite of which the first non-circular wheel is secured to a second non-circular and coaxial satellite wheel to the latter.
- the first non-circular satellite wheel then has a kinematic connection with the barrel shaft, via the first non-circular sun wheel, the second non-circular satellite wheel being intended to have a kinematic connection with the winding mechanism. by means of a second non-circular solar wheel.
- the second non-circular sun wheel is preferably coaxial with the barrel shaft being free to rotate relative thereto.
- the present invention also relates to a watch movement provided with such a mechanism and a timepiece comprising such a watch movement.
- Figures 1a, 1b and 1c show diagrammatic diagrams illustrating the operation of a mechanism according to a first preferred embodiment of the present invention
- FIGS. 2a and 2b show views, respectively from above and in cross section, of the mechanism of FIGS. 1a to 1c;
- FIG. 3 represents a diagram illustrating the result of calculations carried out for the implementation of the mechanism of FIGS. 2a and 2b;
- FIG. 4 represents a comparative diagram illustrating the effects of the mechanism of FIGS. 2a and 2b with reference to other constructions;
- - Figure 5 shows a diagram illustrating the behavior of the mechanism of Figures 2a and 2b;
- FIGS. 6a, 6b and 6c show schematic diagrams illustrating the operation of a mechanism according to a second preferred embodiment of the present invention
- FIGS. 7a and 7b show views, respectively from above and in cross section, of the mechanism of FIGS. 6a to 6c;
- FIG. 8 represents a diagram illustrating the result of calculations carried out for the implementation of the mechanism of FIGS. 7a and 7b;
- FIG. 9 represents a comparative diagram illustrating the effects of the mechanism of FIGS. 7a and 7b with reference to other constructions.
- Figure 10 shows a diagram illustrating the behavior of the mechanism of Figures 7a and 7b.
- a basic principle of the present invention lies in the implementation of a planetary gear train in a gear train defining a kinematic connection between the two ends of a mainspring, for reinjecting mechanical energy. taken from one to the other.
- a mainspring delivers energy to a finishing gear train via a barrel drum and is reloaded by the shaft of the barrel
- the planetary gear is of the type with two solar wheels and double satellite, and comprises at least two wheels whose periphery is non-circular.
- Figures 1a, 1b and 1c show diagrammatic diagrams illustrating the operation of a mechanism according to a first embodiment of the invention. preferred embodiment of the present invention. According to this first embodiment, the reinjection of the mechanical energy occurs only unidirectionally, that is to say always from one end of the mainspring to the other.
- a planetary gear generally comprises three inputs / outputs which have been referenced by A, B and C in FIGS. 1a to 1c, C being a satellite carrier, while the D block schematizes the satellite of the planetary gear. .
- the mechanism according to the present invention comprises a barrel 1 comprising a drum 2 housing a barrel spring 3, whose outer end is integral with the drum and the inner end is integral with a bung 4, itself integral of a barrel tree 5.
- the barrel 1 is intended to be associated with a watch movement to maintain the oscillations of a mechanical resonator 6, schematized here by a sprung-balance (whose spiral is not shown) cooperating with an escapement.
- the transmission of mechanical energy from the barrel drum 2 to the resonator is performed by a gear train not shown here.
- the watch movement conventionnellennent includes a winding mechanism of the spring 3 barrel, schematized here by a winding rod 7.
- a and C here represent inputs of the planetary gear, while B represents an output of the planetary gear. More specifically, the inlet A has a kinematic connection with the barrel drum 2, the inlet C with the winding mechanism, and the outlet B with the barrel shaft 5.
- Figure 1 illustrates the situation corresponding to the winding of the mainspring from the winding mechanism.
- FIG. 1b illustrates the situation corresponding to the current operation of the watch movement, that is to say when the drum unwinds to maintain the oscillations of the resonator 6. More precisely, FIG. 1b corresponds to the case where the 3 barrel spring is heavily loaded.
- the carrier is immobilized, for example by a pawl provided in the winding mechanism, while the barrel drum 2 rotates to transmit mechanical energy to the gear train.
- the rotation of the drum causes that of A which causes that of B via the satellite D.
- a portion of the mechanical energy delivered by the barrel drum is reinjected at the level of barrel shaft for reloading the barrel spring 3.
- FIG. 1 c also illustrates a situation corresponding to the current operation of the watch movement, that is to say when the drum unwinds to maintain the oscillations of the resonator 6. More precisely, FIG. 1c corresponds to the case where the barrel spring 3 is weakly loaded.
- Figures 2a and 2b show views, respectively from above and in cross section along line II-II of Figure 2a, of a mechanism having the characteristics which have just been described in connection with Figures 1a. at 1 tbsp.
- the first movable wheel of the issage end here a mobile medium 20, has been shown for illustrative purposes in Figures 2a and 2b, the latter comprising a pinion 21, arranged in engagement with the drum 2 of barrel, and a wheel 22, for transmitting the mechanical energy received from the barrel to the rest of the work train.
- the planetary gear is arranged on the drum 2 and comprises a ratchet 24 (shown partially broken away in FIG. 2a for more clarity) playing the role of the planet carrier C, free to rotate with reference to the bung 4.
- the ratchet carries a satellite 26 comprising a first non-circular wheel 28 arranged in engagement with a first non-circular solar wheel 30, the latter being coaxial to the barrel shaft 5 and secured to the latter.
- the satellite further carries a second wheel 32, circular and arranged in engagement with a second sun gear 34, also circular.
- the wheels 28 and 32 are integral with each other in rotation.
- the second sun gear here has the shape of a pinion, the latter being integral in rotation with the barrel drum 2.
- the pinion can for example be driven into the drum.
- the proportion of the mechanical energy delivered by the drum 2 which is fed back to the plug 4 can be adjusted according to the peripheries of the non-circular wheels 28, 30.
- these peripheries can advantageously be chosen in such a way that the torque actually delivered by the drum to the work train is constant regardless of the state of charge of the mainspring.
- the moment of the barrel depends on the angle of the drum ( ⁇ ) and the angle of the plug ( ⁇ ). It can be described by a continuous function f (0 A , ⁇ ⁇ ):
- this function could be:
- M armed is the moment when the barrel is fully armed and k is the spring constant (rigidity).
- PA is the radius of pinion 34, PB that of wheel 30, PSA that of wheel 32, and PSB that of wheel 28.
- Mbariiiet Marmé - ⁇ ⁇ ( ⁇ - ⁇ ) if ⁇ > ⁇ and 0 otherwise.
- Marmé The number of turns of development of the spring in the barrel can be fixed;
- the primitive is in a xy plane.
- the corresponding wheel can be cut in a flat plate, as opposed to non-circular gears with several turns whose contact line rises in the direction of the z-axis (shaped snail shell);
- FIG. 4 represents a comparative diagram illustrating the effects of the mechanism of FIGS. 2a and 2b with reference to other constructions, by illustrating the available torque as a function of the angular position of the barrel drum.
- the conventional M-wheel curve represents the characteristic of the barrel without the reinjection mechanism according to the present invention.
- the curve M with reinjection represents the torque available to the end gear issage as a function of the angular position of the drum for the particular case calculated previously. It can be seen that the available torque at finishing gear is quite constant. On the other hand, it also shows that the area under the curve, which represents the mechanical energy, is equivalent to that under the curve M r0 conventional creep.
- the curve M re ssort with reinjection shows that, thanks to the mechanism of the present invention, the barrel spring discharges slowly at the beginning of the discharge (when the torque is high) and faster when disarmed.
- the abscissa of FIG. 4 represents proportionally the time that passes when the watch movement is a current operating mode.
- FIG. 5 represents a diagram illustrating the angular position of the bung with respect to the angular position of the barrel drum, during the discharge time of the mainspring (the time being proportional to Otambour).
- Figures 6a, 6b and 6c show schematic diagrams illustrating the operation of a mechanism according to a second preferred embodiment of the present invention.
- the reinjection of the mechanical energy is likely to occur bidirectionally, that is to say from one end of the mainspring to the other and vice versa.
- the planetary gear can advantageously comprise three inputs / outputs, as in the first embodiment, which have been referenced by A, B and C in FIGS. 6a to 6c, C being a satellite carrier, while block D schematizes the satellite of the planetary gear.
- A here represents an input of the planetary gear
- B and C represent inputs-outputs of the planetary gear. More specifically, the input A has a kinematic connection with the winding mechanism, while the inputs-outputs B and C have respective kinematic links with the barrel shaft 5 and with the barrel drum 2.
- Figure 6a illustrates the situation corresponding to the winding of the mainspring from the winding mechanism.
- FIG. 6b illustrates the situation corresponding to the current operation of the watch movement, that is to say when the barrel is unwound to maintain the oscillations of the resonator 6. More specifically, Figure 6b corresponds to the case where the spring 3 barrel is heavily loaded.
- A is immobilized, for example by a pawl provided in the winding mechanism, while the barrel drum 2 rotates to transmit mechanical energy to the gear train.
- the rotation of the drum causes that of C which causes that of B, via the satellite D.
- a portion of the mechanical energy delivered by the drum drum is reinjected at the level of barrel shaft for reloading the barrel spring 3.
- Figure 6c also illustrates a situation corresponding to the current operation of the watch movement, that is to say when the barrel unwinds to maintain oscillations of the resonator 6. More precisely, FIG. 6c corresponds to the case where the barrel spring 3 is weakly loaded.
- Figures 7a and 7b show views, respectively from above and in cross section along the line VII-VII of Figure 7a, of a mechanism having the characteristics which have just been described in relation to Figures 6a to 6c.
- a first movable wheel end issage here a mobile of high average 120, has been shown for illustrative purposes in Figures 7a and 7b, it comprising a pinion 121, arranged in engagement with the drum 102 of barrel, and a wheel 122, for transmitting mechanical energy received from the barrel to the rest of the work train.
- the planetary gear is arranged on the drum 102 and comprises a ratchet 124 (shown partially broken away in FIG. 7a for the sake of clarity) mounted free to rotate on the barrel shaft 105.
- a ratchet 124 shown partially broken away in FIG. 7a for the sake of clarity
- FIG. 7b shows that the barrel drum 102 plays the role of the planet carrier C, free to rotate with reference to the bung 104.
- the drum 102 carries a satellite 126 comprising a first non-circular wheel
- first non-circular solar wheel 130 arranged in engagement with a first non-circular solar wheel 130, the latter being coaxial with the barrel shaft 105 and secured thereto.
- the satellite further carries a second non-circular wheel 132 and arranged in engagement with a second non-circular sun wheel 134.
- the latter is intended to have a kinematic connection with the winding mechanism.
- it is arranged integral in rotation with the ratchet 124 intended to be rotated by the winding mechanism.
- the wheels 128 and 132 are integral in rotation.
- FIG. 7b The satellite-carrier configuration is more clearly apparent from FIG. 7b, in which it appears that the satellite is assembled with the barrel drum 102 by a shaft 136.
- the operation of this mechanism is as described above, in connection with Figures 6a to 6c.
- the proportion of the mechanical energy delivered by the drum 102 which is reinjected to the plug 104 and the proportion of energy taken from the plug to be reinjected into the work train can be adjusted according to the peripheries of the wheels.
- these peripheries may advantageously be chosen in such a way that the torque actually delivered by the drum to the work train is constant regardless of the state of charge of the mainspring.
- this function could be:
- PA is the radius of the wheel 134, PB that of the wheel 130, PSA that of the wheel 132, and PSB that of the wheel 128.
- a minimum gear ratio may be imposed between the wheel 128 of the satellite and the wheel 130 secured to the bung. This allows to save space in the center of the wheel 130 to have a hub.
- FIG. 9 represents a comparative diagram illustrating the effects of the mechanism of FIGS. 7a and 7b with reference to other constructions, by illustrating the available torque as a function of the angular position of the barrel drum.
- the curve M conventional wheel represents the characteristic of the barrel without the feedback mechanism according to the present invention.
- the curve M gear with feedback represents the torque available to the work train according to the angular position of the drum for the particular case calculated above. It can be seen that the torque available to the finishing gear is quite constant. On the other hand, it also shows that the area under the curve, which represents the mechanical energy, is equivalent to that under the curve M r0 conventional creep.
- the curve M spring with feedback shows that, thanks to the mechanism according to the present invention, the mainspring slowly discharges at the beginning of its discharge (when its torque is high) and more quickly when it is disarmed.
- FIG. 10 represents a diagram, similar to that of FIG. 5, illustrating the angular position of the bung with respect to the position angular of the barrel drum, during the discharge time of the mainspring (the time being proportional to Otambour).
- non-circular wheels used traverse more than one turn on themselves without departing from the scope of the invention. In this case, these wheels would not be flat, as mentioned above.
- the shape and the material of the latter can be optimized so as to restore a maximum of energy on this single development tour since the torque available to the finishing gear is controlled.
- the profiles of the teeth used will be advantageously optimized to reduce the air pressures involved, while usually they are rather optimized to ensure a homogeneous transmission of torque and speed.
- a stop mechanism of the winding when the mainspring is fully loaded may for example be made directly by a choice of adapted shapes of the peripheries of the non-circular wheels, each of which may have a side intended to cooperate with the side of the other wheel to define a stop.
- a disengagement device of the automatic winding mechanism could be advantageously provided to limit the stresses applied to the mechanism when the spring is fully loaded, or a device for locking the oscillating mass.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission Devices (AREA)
- Gears, Cams (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH00987/11A CH705079A1 (fr) | 2011-06-10 | 2011-06-10 | Source d'énergie mécanique pour mouvement horloger à couple de sortie prédéfini. |
PCT/EP2012/060920 WO2012168443A2 (fr) | 2011-06-10 | 2012-06-08 | Source d'energie mecanique pour mouvement horloger a couple de sortie predefini |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2718769A2 true EP2718769A2 (fr) | 2014-04-16 |
EP2718769B1 EP2718769B1 (fr) | 2016-04-06 |
Family
ID=47296539
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12732989.4A Active EP2718769B1 (fr) | 2011-06-10 | 2012-06-08 | Source d'energie mecanique pour mouvement horloger a couple de sortie predefini |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2718769B1 (fr) |
CH (1) | CH705079A1 (fr) |
WO (1) | WO2012168443A2 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2871537B1 (fr) * | 2013-11-06 | 2017-01-04 | ETA SA Manufacture Horlogère Suisse | Montre à réserve de marche améliorée |
EP3070535B1 (fr) | 2015-03-18 | 2020-04-29 | Glashütter Uhrenbetrieb GmbH | Barillet ayant un couple de rotation essentiellement constant |
EP3112949B1 (fr) | 2015-07-01 | 2018-04-25 | Cartier International AG | Source d'energie mecanique pour mouvement horloger |
EP3182217B1 (fr) * | 2015-12-18 | 2018-11-14 | Montres Breguet S.A. | Mécanisme de réglage de rapport de couple entre des mobiles d'horlogerie |
CN110953306B (zh) * | 2019-12-17 | 2021-06-18 | 清华大学 | 一种基于非圆行星齿轮的非线性弹簧机构 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1914604A1 (fr) * | 2006-10-19 | 2008-04-23 | Girard-Perregaux S.A. | Mouvement horloger avec transmission d'energie à couple constant entre la source d'energie et l'oscillateur mécanique |
US7832924B2 (en) * | 2007-03-27 | 2010-11-16 | Seiko Epson Corporation | Timepiece |
JP5050756B2 (ja) | 2007-09-28 | 2012-10-17 | セイコーエプソン株式会社 | ゼンマイ装置および時計 |
CN201199317Y (zh) * | 2008-03-31 | 2009-02-25 | 天津海鸥表业集团有限公司 | 机械手表定时制动摆轮机构 |
EP2264551B1 (fr) * | 2009-06-16 | 2013-08-07 | Samep S.A. - Montres Emile Pequignet | Engrenage differentiel pour mouvement horloger |
CN201464813U (zh) * | 2009-07-03 | 2010-05-12 | 天津海鸥表业集团有限公司 | 差动输出条盒轮 |
JP2011169799A (ja) * | 2010-02-19 | 2011-09-01 | Citizen Holdings Co Ltd | ゼンマイトルク補正機構付き時計 |
-
2011
- 2011-06-10 CH CH00987/11A patent/CH705079A1/fr not_active Application Discontinuation
-
2012
- 2012-06-08 EP EP12732989.4A patent/EP2718769B1/fr active Active
- 2012-06-08 WO PCT/EP2012/060920 patent/WO2012168443A2/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2012168443A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2012168443A2 (fr) | 2012-12-13 |
CH705079A1 (fr) | 2012-12-14 |
WO2012168443A3 (fr) | 2013-01-31 |
EP2718769B1 (fr) | 2016-04-06 |
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