WO2015049165A1 - Mainspring for a main barrel minimizing wear on the drum - Google Patents

Mainspring for a main barrel minimizing wear on the drum Download PDF

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Publication number
WO2015049165A1
WO2015049165A1 PCT/EP2014/070548 EP2014070548W WO2015049165A1 WO 2015049165 A1 WO2015049165 A1 WO 2015049165A1 EP 2014070548 W EP2014070548 W EP 2014070548W WO 2015049165 A1 WO2015049165 A1 WO 2015049165A1
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WO
WIPO (PCT)
Prior art keywords
mainspring
drum
spring portion
zone
spring
Prior art date
Application number
PCT/EP2014/070548
Other languages
French (fr)
Inventor
Elmar Mock
Christophe LÉCHOT
Ludovic FARRUGGIO
Original Assignee
Cartier Création Studio Sa
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 Cartier Création Studio Sa filed Critical Cartier Création Studio Sa
Priority to EP14772389.4A priority Critical patent/EP3052992A1/en
Publication of WO2015049165A1 publication Critical patent/WO2015049165A1/en

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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
    • G04B5/00—Automatic winding up
    • G04B5/24—Protecting means preventing overwinding

Definitions

  • the present invention relates to a motor spring for mounting in a self-winding watch engine cylinder to minimize wear of the barrel drum in which it is mounted.
  • the automatic winding of a watch is done permanently.
  • the barrel spring When the barrel spring is fully armed, it must limit its overvoltage to avoid breakage. The movements of the oscillating mass must have no effect on the spring when it has reached its maximum tension.
  • the barrel spring of the automatic watch typically has a sliding flange that functions as a valve. Indeed, when the armature has reached its maximum value, the spring will slide a certain angle in the barrel drum.
  • the wall may comprise notches whose role is to limit the sliding of the flange during overvoltages of the mainspring. In this case, the end of the mainspring usually stops in each notch.
  • the smooth operation of the sliding flange is delicate and depends on several factors such as the shape and the tension of the flange, the material and the quality of the machining of the barrel drum, the galvanic treatment, the lubrication of the barrel and its jurisdiction. It has been observed that, during the sliding of the flange during overvoltages of the mainspring, the end of the motor spring comes to bear against the inner wall of the barrel drum. This tends to produce premature wear of the wall, by chiseling.
  • An object of the present invention is to provide a barrel drive spring free from the limitations of known springs.
  • Another object of the invention is to provide a barrel drive spring adapted to come into contact with the inner wall of the barrel drum in at least one tangent plane.
  • a motor spring comprising: a first spiral-shaped spring portion having a first curvature and having an inner end intended to be fixed to a shaft of a barrel; a second spring portion extending from the first spring portion and arranged to cooperate with a barrel of a barrel, the second spring portion having a second curvature of opposite direction to the first curvature and a descending radius of curvature of the end close to the first spring portion at an outer end of the second spring portion; the second spring portion further comprising a tangency zone having a radius of curvature smaller than the radius of curvature of the drum of a cylinder in which the mainspring is intended to be mounted, so that when the mainspring is mounted in the barrel, the tangent zone comes into contact with the inner surface of the drum in at least one line of intersection between the tangent zone and the
  • An advantage of the present solution is that the motor spring 1 comes into contact with the inner wall of the barrel drum in at least one tangent plane.
  • the chipping effect observed in the case of springs conventional motor is replaced by sliding of the contact region. The wear of the drum is therefore considerably reduced.
  • FIG. 1 to 1 c illustrate a motor spring 1 intended to be mounted in a timepiece motor cylinder in its free state, according to one embodiment
  • Figure 2 shows the motor spring 1 mounted in a motor cylinder, according to one embodiment
  • FIG. 3 illustrates a sectional view of a second spring portion of the mainspring comprising a tangency zone, according to one embodiment
  • Figure 4 illustrates the zone of tangency, according to another embodiment
  • FIG. 5 illustrates the zone of tangency, again according to another embodiment.
  • FIG. 1 Figures 1 to 1 c illustrate a motor spring 1 to be mounted in a watch engine cylinder in its free state, that is to say before mounting in the barrel.
  • the motor spring 1 mounted in a motor cylinder 30 is shown in FIG. 2.
  • the motor spring 1 comprises a first portion 2 of spiral shape having a first curvature and comprising an inner end 3 intended to be fixed on a shaft of the barrel 32, and a second portion 4 extending from the first spring portion and arranged to cooperate with the inner surface of a drum 31 of the barrel 30.
  • the second spring portion 4 has a second curvature of opposite direction to the first curvature and a decreasing radius of curvature of end near the first portion spring 2 at an outer end 7 (or spring tip) of the second spring portion 4.
  • the first curvature of the first portion 2 of the motor spring 1 has a growing radius.
  • the radius of curvature tends towards infinity between the first and second portions 2, 4 (indicated by the number 23 in FIG. 1), then the radius is reversed (curvature of opposite direction) and finally decreases in the second portion 4 to give the motor spring 1 an inverted spiral winding in the form of a letter S or in the form of a ground key.
  • the second spring portion 4 comprises a tangency zone 5 having a curvature of opposite direction than the second curvature and a radius of curvature smaller than the barrel drum radius 30.
  • the tangent zone 5 comes into contact with the inner surface of the drum 31 in at least one tangent plane, that is to say, along at least one intersection line between the tangent zone 5 and the inner surface of the drum 31.
  • the tangency zone 5 has a flexural strength less than that of at least part of the rest of the second spring portion 4.
  • a flexural strength can be obtained, for example, in the case where the thickness 9 (or the height) of the mainspring 1 in the zone of tangency 5 is less than the thickness of the motor spring 1 in the second spring portion 4.
  • FIG. 3 shows a sectional view in the direction of the thickness of the second spring portion 4.
  • the tangency zone 5 further comprises a rectangular slot 8 cut in the material of the motor spring 1.
  • the rectangular slot 8 extends over a portion of the outer portion 6 so to further reduce the section, and thus the flexural strength, of the area of tangency with respect to the section and the flexural strength that prevails in the rest of the second spring portion 4.
  • rectangular 8 extends to the outer end 7 of the second spring portion 4 so that the outer portion 6 of the motor spring 1 is divided into two parallel blades.
  • each of the portions 5 'of the tangent zone 5 results in a point of contact between the tangency zone 5 and the surface Inside the drum 31.
  • the position of the tangent zone 5 along the outer portion 6 of the motor spring 1 depends on the position of the slot 8 along the outer portion 6 and its configuration.
  • the motor spring 1 is made of a metallic material and a heat treatment is carried out locally in the tangency zone 5.
  • the heat treatment is arranged to reduce the bending strength in the zone of tangency 5.
  • the tangency zone 5 has been plastically deformed so as to orient the tip of the spring 7 towards the center of the barrel 30, so as to reduce or eliminate, the chipping effect of the tip 7 on the drum 31.
  • a bent portion 10 of the second spring portion 4 i.e., a portion of the second spring portion 4 extending from the tangent zone 5 to the outer end 7 has a curvature opposite to that of the second portion of spring 4 and is not in contact with the wall of the drum 31 when the spring 1 is mounted in the barrel 30.
  • the area of tangency 5 having a radius of curvature smaller than the radius of curvature of the drum 31 can be likened to a folding zone of the outer portion 6 of the spring 1.
  • the curvature in the zone of tangency 5 results in a contact zone 51 with the inner surface of the drum 31 in at least one plane tangential to the zone of tangency 5. Outside the zone of tangency 5, the mainspring 1 may not be in contact with the drum 31.
  • FIGS. 1c and 2 it is indeed noted that the outer end 7 of the spring 1 is detached from the drum 31.
  • the tangent zone 5 is always in contact with the drum 31 in the contact zone 51, which makes it possible to reduce the forces applied on the tip 7 in the case where the latter is also in contact with the drum 31.
  • the tangency zone 5 has undergone plastic deformation so that the bent portion 10 has a curvature in the opposite direction to the second curvature of the second spring portion 4.
  • the tip 7 can be in contact with the drum 31 when the spring 1 is mounted in the barrel 30.
  • the contact zone 51 will therefore include a contact at the tangency zone 5 and possibly also a contact at the of the tip 7.
  • the curvature of the tangency zone 5 is such that the bent portion 10 is flattened and in contact with the inner surface of the drum 31 tangent to the portion bent 10 when the spring 1 is mounted in the barrel 30.
  • the outer end 7 is also in tangential contact with the inner surface of the drum 31 and therefore does not produce chipping and / or wear pr matured from the inner surface of the drum 31.
  • the contact between the second spring portion 4 and the drum 31 may comprise the tangent zone 5 and one or more other contact zones 51 along the bent portion 10, for example at the outer end 7 or any other point between the tangent zone 5 and the outer end 7.
  • the second spring portion 4 may also include a sliding flange 14 shown schematically in Figures 1 and 2 extending along the second spring portion 4. In this case, the sliding flange 14 should not extend. beyond the outer portion 6 and in any case the tangency zone 5.
  • the tangent zone 5 extends from where the sliding flange 14 is no longer in contact with the second spring portion 4 (where the non-welded side of the sliding flange stops) and up to the outer end 7.
  • the zone of tangency 5 may extend over a portion of the conde portion of spring 4
  • the bent portion 10 should not exceed twice the length of the notch, and preferably the length of the notch.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Springs (AREA)

Abstract

The invention relates to a mainspring (1) mounted in a main barrel (30) of an self-winding clock, comprising: a first spiral-shaped spring portion (2) having a first curvature and having an inner end (3) secured to a shaft of a barrel (32); a second spring portion (4) extending from the first spring portion (2) and arranged to interact with a drum of a barrel, the second spring portion (4) having a second curvature a direction opposite that of the first curvature and a curvature radius that decreases from an end that is near the first spring portion (2) towards an outer end (7) of the second spring portion (4); the second spring portion (4) furthermore includes a tangency area (5) having a smaller curvature radius than the curvature radius of the drum (31), such that, when the mainspring (1) is mounted in the barrel (30), the tangency area (5) engages the inner surface of the drum (31) along at least one line of intersection between the tangency area (5) and the inner surface of the drum (31).

Description

Ressort moteur pour barillet moteur minimisant l'usure du tambour  Motor spring for engine cylinder minimizes drum wear
Domaine technique Technical area
[0001] La présente invention concerne un ressort moteur destiné à être monté dans un barillet moteur de montre à remontage automatique permettant de minimiser l'usure du tambour du barillet dans lequel il est monté. The present invention relates to a motor spring for mounting in a self-winding watch engine cylinder to minimize wear of the barrel drum in which it is mounted.
Etat de la technique State of the art
[0002] Le remontage automatique d'une montre se fait en permanence. Lorsque le ressort de barillet est complètement armé, il faut limiter sa surtension afin d'éviter la casse. Les déplacements de la masse oscillante doivent être sans effet sur le ressort lorsqu'il a atteint sa tension maximum. [0003] Afin d'éviter cette surtension, le ressort de barillet de la montre automatique possède typiquement une bride glissante qui fonctionne comme une soupape. En effet, lorsque l'armage a atteint sa valeur maximale, le ressort va glisser d'un certain angle dans le tambour de barillet. [0004] La paroi intérieure du tambour de barillet de la montre The automatic winding of a watch is done permanently. When the barrel spring is fully armed, it must limit its overvoltage to avoid breakage. The movements of the oscillating mass must have no effect on the spring when it has reached its maximum tension. To avoid this overvoltage, the barrel spring of the automatic watch typically has a sliding flange that functions as a valve. Indeed, when the armature has reached its maximum value, the spring will slide a certain angle in the barrel drum. The inner wall of the barrel drum of the watch
automatique n'a donc pas de crochet mais est plutôt lisse. La paroi peut comprendre des encoches qui ont pour rôle de limiter le glissement de la bride lors des surtensions du ressort moteur. Dans ce cas, l'extrémité du ressort moteur s'arrête en général dans chaque encoche. [0005] Le bon fonctionnement de la bride glissante est délicat et dépend de plusieurs facteurs tels que la forme et la tension de la bride, la matière et la qualité de l'usinage du tambour de barillet, le traitement galvanique, la lubrification du barillet et de son ressort. [0006] Il a été observé que, lors du glissement de la bride lors des surtensions du ressort moteur, l'extrémité du ressort moteur vient s'appuyer contre la paroi intérieure du tambour de barillet. Cela tend à produire une usure prématurée de la paroi, par burinage. Automatic therefore has no hook but is rather smooth. The wall may comprise notches whose role is to limit the sliding of the flange during overvoltages of the mainspring. In this case, the end of the mainspring usually stops in each notch. The smooth operation of the sliding flange is delicate and depends on several factors such as the shape and the tension of the flange, the material and the quality of the machining of the barrel drum, the galvanic treatment, the lubrication of the barrel and its jurisdiction. It has been observed that, during the sliding of the flange during overvoltages of the mainspring, the end of the motor spring comes to bear against the inner wall of the barrel drum. This tends to produce premature wear of the wall, by chiseling.
Bref résumé de l'invention [0007] Un but de la présente invention est de proposer un ressort moteur de barillet exempt des limitations des ressorts moteur connus. BRIEF SUMMARY OF THE INVENTION [0007] An object of the present invention is to provide a barrel drive spring free from the limitations of known springs.
[0008] Un autre but de l'invention est de proposer un ressort moteur de barillet apte à venir en contact avec la paroi intérieure du tambour de barillet selon au moins un plan tangent. [0009] Selon l'invention, ces buts sont atteints notamment au moyen ressort moteur comportant: une première portion de ressort de forme spirale présentant une première courbure et ayant une extrémité intérieure destinée à être fixée à un arbre d'un barillet; une seconde portion de ressort s'étendant de la première portion de ressort et arrangée pour coopérer avec un tambour d'un barillet, la seconde portion de ressort ayant une seconde courbure de sens opposée à la première courbure et un rayon de courbure décroissant de extrémité proche de la première portion de ressort à une extrémité externe de la seconde portion de ressort; la seconde portion de ressort comprenant en outre une zone de tangence ayant un rayon de courbure plus petit que le rayon de courbure du tambour d'un barillet dans lequel le ressort moteur est destiné à être monté, de sorte que, lorsque le ressort moteur est monté dans le barillet, la zone de tangence vient en contact avec la surface intérieure du tambour selon au moins une ligne d'intersection entre la zone de tangence et la surface intérieure du tambour 31 . Another object of the invention is to provide a barrel drive spring adapted to come into contact with the inner wall of the barrel drum in at least one tangent plane. According to the invention, these objects are achieved in particular by means of a motor spring comprising: a first spiral-shaped spring portion having a first curvature and having an inner end intended to be fixed to a shaft of a barrel; a second spring portion extending from the first spring portion and arranged to cooperate with a barrel of a barrel, the second spring portion having a second curvature of opposite direction to the first curvature and a descending radius of curvature of the end close to the first spring portion at an outer end of the second spring portion; the second spring portion further comprising a tangency zone having a radius of curvature smaller than the radius of curvature of the drum of a cylinder in which the mainspring is intended to be mounted, so that when the mainspring is mounted in the barrel, the tangent zone comes into contact with the inner surface of the drum in at least one line of intersection between the tangent zone and the inner surface of the drum 31.
[0010] Un avantage de la présente solution est que le ressort moteur 1 vient en contact avec la paroi intérieure du tambour de barillet selon au moins un plan tangent. L'effet de burinage observé dans le cas des ressorts moteur conventionnels est remplacé par un glissement de la région de contact. L'usure du tambour est donc considérablement diminuée. An advantage of the present solution is that the motor spring 1 comes into contact with the inner wall of the barrel drum in at least one tangent plane. The chipping effect observed in the case of springs conventional motor is replaced by sliding of the contact region. The wear of the drum is therefore considerably reduced.
Brève description des figures Brief description of the figures
[0011] Des exemples de mise en œuvre de l'invention sont indiqués dans la description illustrée par les figures annexées dans lesquelles : Examples of implementation of the invention are indicated in the description illustrated by the appended figures in which:
La figures 1 a à 1 c illustrent un ressort moteur 1 destiné à être monté dans un barillet moteur de pièce d'horlogerie dans son état libre, selon un mode de réalisation;  1 to 1 c illustrate a motor spring 1 intended to be mounted in a timepiece motor cylinder in its free state, according to one embodiment;
La figure 2 montre le ressort moteur 1 monté dans un barillet moteur, selon un mode de réalisation;  Figure 2 shows the motor spring 1 mounted in a motor cylinder, according to one embodiment;
La figure 3 illustre une vue en coupe d'une seconde portion de ressort du ressort moteur comprenant une zone de tangence, selon un mode de réalisation;  FIG. 3 illustrates a sectional view of a second spring portion of the mainspring comprising a tangency zone, according to one embodiment;
La figure 4 illustre la zone de tangence, selon un autre mode de réalisation; et  Figure 4 illustrates the zone of tangency, according to another embodiment; and
La figure 5 illustre la zone de tangence, encore selon un autre mode de réalisation.  FIG. 5 illustrates the zone of tangency, again according to another embodiment.
Exemple(s) de mode de réalisation de l'invention Example (s) of embodiment of the invention
[0012] Les figures 1 a à 1 c illustrent un ressort moteur 1 destiné à être monté dans un barillet moteur de pièce d'horlogerie dans son état libre, c'est-à-dire avant son montage dans le barillet. Le ressort moteur 1 monté dans un barillet moteur 30 est représenté à la figure 2. Le ressort moteur 1 comporte une première portion 2 de forme spirale présentant une première courbure et comprenant une extrémité intérieure 3 destinée à être fixée sur un arbre du barillet 32, et une seconde portion 4 s'étendant de la première portion de ressort et arrangée pour coopérer avec la surface intérieure d'un tambour 31 du barillet 30. La seconde portion de ressort 4 a une seconde courbure de sens opposée à la première courbure et un rayon de courbure décroissant de extrémité proche de la première portion de ressort 2 à une extrémité externe 7 (ou pointe du ressort) de la seconde portion de ressort 4. Autrement dit, la première courbure de la première portion 2 du ressort moteur 1 a un rayon croissant. Le rayon de courbure tend vers l'infini entre les première et seconde portions 2, 4 (indiqué par le numéro 23 sur la figure 1 ), puis le rayon s'inverse (courbure de sens opposé) et enfin décroit dans la seconde portion 4 pour donner au ressort moteur 1 un enroulement spiral renversé en forme de lettre S ou en forme de clé de sol. Figures 1 to 1 c illustrate a motor spring 1 to be mounted in a watch engine cylinder in its free state, that is to say before mounting in the barrel. The motor spring 1 mounted in a motor cylinder 30 is shown in FIG. 2. The motor spring 1 comprises a first portion 2 of spiral shape having a first curvature and comprising an inner end 3 intended to be fixed on a shaft of the barrel 32, and a second portion 4 extending from the first spring portion and arranged to cooperate with the inner surface of a drum 31 of the barrel 30. The second spring portion 4 has a second curvature of opposite direction to the first curvature and a decreasing radius of curvature of end near the first portion spring 2 at an outer end 7 (or spring tip) of the second spring portion 4. In other words, the first curvature of the first portion 2 of the motor spring 1 has a growing radius. The radius of curvature tends towards infinity between the first and second portions 2, 4 (indicated by the number 23 in FIG. 1), then the radius is reversed (curvature of opposite direction) and finally decreases in the second portion 4 to give the motor spring 1 an inverted spiral winding in the form of a letter S or in the form of a ground key.
[0013] Selon l'invention, la seconde portion de ressort 4 comprend une zone de tangence 5 ayant une courbure de sens opposé que la seconde courbure et un rayon de courbure plus petit que le rayon de tambour de barillet 30. De la sorte, lorsque le ressort moteur 1 est monté dans le barillet 30, la zone de tangence 5 vient en contact avec la surface intérieure du tambour 31 selon au moins un plan tangent, c'est-à-dire, selon au moins une ligne d'intersection entre la zone de tangence 5 et la surface intérieure du tambour 31 . According to the invention, the second spring portion 4 comprises a tangency zone 5 having a curvature of opposite direction than the second curvature and a radius of curvature smaller than the barrel drum radius 30. In this way, when the mainspring 1 is mounted in the barrel 30, the tangent zone 5 comes into contact with the inner surface of the drum 31 in at least one tangent plane, that is to say, along at least one intersection line between the tangent zone 5 and the inner surface of the drum 31.
[0014] Selon un mode de réalisation, la zone de tangence 5 a une résistance en flexion inférieure à celle d'au moins une partie du reste de la seconde portion de ressort 4. [0015] Une telle résistance en flexion peut être obtenue, par exemple, dans le cas où l'épaisseur 9 (voire la hauteur) du ressort moteur 1 dans la zone de tangence 5 est inférieure à l'épaisseur du ressort moteur 1 dans la seconde portion de ressort 4. Cette configuration est illustrée à la figure 3 qui montre une vue en coupe dans le sens de l'épaisseur de la seconde portion de ressort 4. According to one embodiment, the tangency zone 5 has a flexural strength less than that of at least part of the rest of the second spring portion 4. [0015] Such a flexural strength can be obtained, for example, in the case where the thickness 9 (or the height) of the mainspring 1 in the zone of tangency 5 is less than the thickness of the motor spring 1 in the second spring portion 4. This configuration is illustrated in FIG. FIG. 3 shows a sectional view in the direction of the thickness of the second spring portion 4.
[0016] Notons qu'une diminution de la section de la seconde portion de ressort 4 dans la zone de tangence 5 qui serait obtenue par une diminution de la largeur du ressort ne permettrait pas nécessairement la même diminution de la résistance en flexion, et alors une diminution de Note that a decrease in the section of the second spring portion 4 in the area of tangency 5 which would be obtained by a decrease in the width of the spring would not necessarily allow the same decrease in flexural strength, and then a decrease of
l'épaisseur est privilégiée. [0017] Dans la variante illustrée à la figure 4, la zone de tangence 5 comprend en outre une fente rectangulaire 8 coupée dans le matériau du ressort moteur 1. La fente rectangulaire 8 s'étend sur une partie de la portion extérieure 6 de façon à réduire encore la section, et donc la résistance en flexion, de la zone de tangence 5 par rapport à la section et la résistance en flexion qui prévalent dans le reste de la seconde portion de ressort 4. the thickness is preferred. In the variant shown in Figure 4, the tangency zone 5 further comprises a rectangular slot 8 cut in the material of the motor spring 1. The rectangular slot 8 extends over a portion of the outer portion 6 so to further reduce the section, and thus the flexural strength, of the area of tangency with respect to the section and the flexural strength that prevails in the rest of the second spring portion 4.
[0018] Dans une autre variante illustrée à la figure 5, La fente In another variant illustrated in Figure 5, The slot
rectangulaire 8 se prolonge jusqu'à l'extrémité externe 7 de la seconde portion de ressort 4 de sorte que la portion extérieure 6 du ressort moteur 1 se divise en deux lames parallèles. rectangular 8 extends to the outer end 7 of the second spring portion 4 so that the outer portion 6 of the motor spring 1 is divided into two parallel blades.
[0019] Dans les configurations des figures 4 et 5, lorsque le ressort moteur 1 est monté dans le barillet 30, chacune des portions 5' de la zone de tangence 5 résulte dans un point de contact entre la zone de tangence 5 et la surface intérieure du tambour 31 . La position de la zone de tangence 5 le long de la portion extérieure 6 du ressort moteur 1 dépend de la position de la fente 8 le long de la portion extérieure 6 ainsi que de sa configuration. In the configurations of Figures 4 and 5, when the mainspring 1 is mounted in the barrel 30, each of the portions 5 'of the tangent zone 5 results in a point of contact between the tangency zone 5 and the surface Inside the drum 31. The position of the tangent zone 5 along the outer portion 6 of the motor spring 1 depends on the position of the slot 8 along the outer portion 6 and its configuration.
[0020] Dans un autre mode de réalisation, le ressort moteur 1 est réalisé dans un matériau métallique et un traitement thermique est réalisé de façon locale dans la zone de tangence 5. Le traitement thermique est arrangé pour réduire la résistance en flexion dans la zone de tangence 5. In another embodiment, the motor spring 1 is made of a metallic material and a heat treatment is carried out locally in the tangency zone 5. The heat treatment is arranged to reduce the bending strength in the zone of tangency 5.
[0021] Encore dans un autre mode de réalisation illustré aux figures 1 c et 2, la zone de tangence 5 a subi une déformation plastique de sorte à orienter la pointe du ressort 7 vers le centre du barillet 30, de façon à diminuer, voire éliminer, l'effet de burinage de la pointe 7 sur le tambour 31 . Dans cette configuration, une portion fléchie 10 de la seconde portion de ressort 4, c'est-à-dire une partie de la seconde portion de ressort 4 s'étendant de la zone de tangence 5 jusqu'à extrémité externe 7 a une courbure inverse de celle de la seconde portion de ressort 4 et n'est pas en contact avec la paroi du tambour 31 lorsque le ressort 1 est monté dans le barillet 30. In yet another embodiment illustrated in Figures 1c and 2, the tangency zone 5 has been plastically deformed so as to orient the tip of the spring 7 towards the center of the barrel 30, so as to reduce or eliminate, the chipping effect of the tip 7 on the drum 31. In this configuration, a bent portion 10 of the second spring portion 4, i.e., a portion of the second spring portion 4 extending from the tangent zone 5 to the outer end 7 has a curvature opposite to that of the second portion of spring 4 and is not in contact with the wall of the drum 31 when the spring 1 is mounted in the barrel 30.
[0022] La zone de tangence 5 ayant un rayon de courbure plus petit que le rayon de courbure du tambour 31 peut être assimilée à une zone de pliage de la portion extérieure 6 du ressort 1. Comme illustré dans les figures 1 a à c et 2, la courbure dans la zone de tangence 5 résulte dans une zone de contact 51 avec la surface intérieure du tambour 31 selon au moins un plan tangent à la zone de tangence 5. En dehors de la zone de tangence 5, le ressort moteur 1 peut ne pas être en contact avec le tambour 31 . Dans les exemples des figures 1 c et 2, on remarque en effet que l'extrémité externe 7 du ressort 1 est décollée du tambour 31 . La, zone de tangence 5 est toujours en contact avec le tambour 31 dans la zone de contact 51 , ce qui permet de diminuer les forces appliquées sur la pointe 7 dans le cas où cette dernière serait également en contact avec le tambour 31 . The area of tangency 5 having a radius of curvature smaller than the radius of curvature of the drum 31 can be likened to a folding zone of the outer portion 6 of the spring 1. As illustrated in Figures 1 a to c and 2, the curvature in the zone of tangency 5 results in a contact zone 51 with the inner surface of the drum 31 in at least one plane tangential to the zone of tangency 5. Outside the zone of tangency 5, the mainspring 1 may not be in contact with the drum 31. In the examples of FIGS. 1c and 2, it is indeed noted that the outer end 7 of the spring 1 is detached from the drum 31. The tangent zone 5 is always in contact with the drum 31 in the contact zone 51, which makes it possible to reduce the forces applied on the tip 7 in the case where the latter is also in contact with the drum 31.
[0023] Dans l'exemple de la figure 1 a, la zone de tangence 5 a subi une déformation plastique de sorte à ce que la portion fléchie 10 a une courbure de sens opposé à la seconde courbure de la seconde portion de ressort 4. Dans cette configuration, la pointe 7 peut être en contact avec le tambour 31 lorsque le ressort 1 est monté dans le barillet 30. La zone de contact 51 comprendra donc un contact au niveau de la zone de tangence 5 et possiblement également un contact au niveau de la pointe 7. Dans un mode de réalisation montré à la figure 1 b, la courbure de la zone de tangence 5 est telle que la portion fléchie 10 est aplatie et en contact avec la surface intérieure du tambour 31 de façon tangente à la portion fléchie 10 lorsque le ressort 1 est monté dans le barillet 30. Dans une telle configuration, l'extrémité externe 7 est également en contact de façon tangentielle avec la surface intérieure du tambour 31 et donc ne produit pas de burinage et/ou d'usure prématurée de la surface intérieure du tambour 31 . In the example of Figure 1a, the tangency zone 5 has undergone plastic deformation so that the bent portion 10 has a curvature in the opposite direction to the second curvature of the second spring portion 4. In this configuration, the tip 7 can be in contact with the drum 31 when the spring 1 is mounted in the barrel 30. The contact zone 51 will therefore include a contact at the tangency zone 5 and possibly also a contact at the of the tip 7. In one embodiment shown in Figure 1b, the curvature of the tangency zone 5 is such that the bent portion 10 is flattened and in contact with the inner surface of the drum 31 tangent to the portion bent 10 when the spring 1 is mounted in the barrel 30. In such a configuration, the outer end 7 is also in tangential contact with the inner surface of the drum 31 and therefore does not produce chipping and / or wear pr matured from the inner surface of the drum 31.
[0024] Selon la courbure de la zone de tangence 5 et de la portion fléchie 10, le contact entre la seconde portion de ressort 4 et le tambour 31 peut comprendre la zone de tangence 5 et un ou plusieurs autres zones de contact 51 le long de la portion fléchie 10, par exemple à l'extrémité externe 7 ou tout autre point entre la zone de tangence 5 et l'extrémité externe 7. [0025] La seconde portion de ressort 4 peut également comporter une bride glissante 14 représentée schématiquement dans les figures 1 et 2 s'étendant le long de la seconde portion de ressort 4. Dans ce cas, la bride glissante 14 ne devrait pas s'étendre au-delà de la portion extérieure 6 et en tout cas de la zone de tangence 5. [0026] Encore dans un autre mode de réalisation non représenté, la zone de tangence 5 s'étend à partir de l'endroit où la bride glissante 14 n'est plus en contact avec la seconde portion de ressort 4 (là où le côté non- soudé de la bride glissante s'arrête) et jusqu'à extrémité externe 7. Dans le cas où le ressort moteur 1 ne comprend pas de bride, la zone de tangence 5 peut s'étendre sur une partie de la seconde portion de ressort 4 According to the curvature of the tangent zone 5 and the bent portion 10, the contact between the second spring portion 4 and the drum 31 may comprise the tangent zone 5 and one or more other contact zones 51 along the bent portion 10, for example at the outer end 7 or any other point between the tangent zone 5 and the outer end 7. [ 0025] The second spring portion 4 may also include a sliding flange 14 shown schematically in Figures 1 and 2 extending along the second spring portion 4. In this case, the sliding flange 14 should not extend. beyond the outer portion 6 and in any case the tangency zone 5. [0026] In yet another embodiment not shown, the tangent zone 5 extends from where the sliding flange 14 is no longer in contact with the second spring portion 4 (where the non-welded side of the sliding flange stops) and up to the outer end 7. In the case where the mainspring 1 does not include flange, the zone of tangency 5 may extend over a portion of the conde portion of spring 4
correspondant à environ 10% de la circonférence du tambour 30 de barillet 31 dans lequel le ressort 1 est destiné à être monté. Dans le cas particulier d'un barillet dont le tambour 31 comprend des encoches (non représenté), la portion fléchie 10 ne devrait pas excéder deux fois la longueur de l'encoche, et préférablement la longueur de l'encoche. corresponding to about 10% of the circumference of the barrel drum 31 in which the spring 1 is to be mounted. In the particular case of a barrel whose drum 31 comprises notches (not shown), the bent portion 10 should not exceed twice the length of the notch, and preferably the length of the notch.
Numéros de référence employés sur les figures Reference numbers used in the figures
1 ressort moteur 1 motor spring
2 première portion de ressort  2 first portion of spring
3 extrémité intérieure  3 inner end
4 seconde portion de ressort 4 second portion of spring
5 zone tangente  5 tangent area
5' portion de la zone de tangence  5 'portion of the tangency zone
6 portion extérieure  6 outer portion
7 extrémité externe  7 outer end
8 fente 8 slot
9 épaisseur réduite  9 reduced thickness
10 portion fléchie  10 flexed portion
14 bride glissante 14 slippery flange
23 partie du ressort moteur où le rayon de courbure tend vers l'infini 30 barillet moteur  23 part of the mainspring where the radius of curvature tends to infinity 30 engine cylinder
31 tambour de barillet  31 drum barrel
32 arbre de barillet  32 barrel shaft
51 zone de contact 51 contact area

Claims

Revendications claims
1 . Ressort moteur (1 ) destiné à être monté dans un barillet moteur (30) de montre à remontage automatique, comportant: 1. Motor spring (1) for mounting in a self-winding watch motor cylinder (30), comprising:
une première portion de ressort (2) de forme spirale présentant une première courbure et ayant une extrémité intérieure (3) destinée à être fixée à un arbre du barillet (32);  a first spiral-shaped spring portion (2) having a first curvature and having an inner end (3) for attachment to a shaft of the barrel (32);
une seconde portion de ressort (4) s'étendant de la première portion de ressort (2) et arrangée pour coopérer avec un tambour (31 ) du barillet, la seconde portion de ressort (4) ayant une seconde courbure de sens opposée à la première courbure et un rayon de courbure décroissant d'une extrémité proche de la première portion de ressort (2) à une extrémité externe (7) de la seconde portion de ressort (4);  a second spring portion (4) extending from the first spring portion (2) and arranged to cooperate with a drum (31) of the barrel, the second spring portion (4) having a second curvature of opposite direction to the first curvature and a decreasing radius of curvature from one end near the first spring portion (2) to an outer end (7) of the second spring portion (4);
caractérisé en ce que  characterized in that
la seconde portion de ressort (4) comprend en outre une zone tangente (5) ayant un rayon de courbure plus petit que le rayon de courbure du tambour (31), de sorte que, lorsque le ressort moteur (1 ) est monté dans le barillet (30), la zone de tangence (5) vient en contact avec la surface intérieure du tambour (31 ) selon au moins une ligne d'intersection entre la zone de tangence (5) et la surface intérieure du tambour 31 .  the second spring portion (4) further comprises a tangent zone (5) having a radius of curvature smaller than the radius of curvature of the drum (31), so that when the mainspring (1) is mounted in the barrel (30), the tangent zone (5) comes into contact with the inner surface of the drum (31) in at least one line of intersection between the tangent zone (5) and the inner surface of the drum 31.
2. Le ressort moteur (1 ) selon la revendication 1 , 2. The mainspring (1) according to claim 1,
dans lequel la zone de tangence (5) a une résistance en flexion plus petite que celle d'au moins une partie du reste de la seconde portion de ressort (4). wherein the tangency zone (5) has a lower flexural strength than at least a portion of the remainder of the second spring portion (4).
3. Le ressort moteur (1 ) selon la revendication 2, 3. The mainspring (1) according to claim 2,
dans lequel l'épaisseur du ressort moteur (1) dans la zone de tangence (5) est inférieure à l'épaisseur dans au moins une partie du reste de la seconde portion de ressort (4). wherein the thickness of the motor spring (1) in the tangent zone (5) is less than the thickness in at least a portion of the remainder of the second spring portion (4).
4. Le ressort moteur (1 ) selon la revendication 2 ou 3, 4. The mainspring (1) according to claim 2 or 3,
dans lequel la zone de tangence (5) a subi une déformation plastique. wherein the zone of tangency (5) has undergone plastic deformation.
5. Le ressort moteur (1 ) selon la revendication 3 ou 4, 5. The mainspring (1) according to claim 3 or 4,
dans lequel la zone de tangence (5) comprend en outre une section (9) plus petite que la section du reste de la seconde portion de ressort (4). wherein the tangent area (5) further comprises a section (9) smaller than the rest section of the second spring portion (4).
6. Le ressort moteur (1 ) selon la revendication 5, 6. The mainspring (1) according to claim 5,
dans lequel la zone de tangence (5) comprend une fente (8). wherein the tangency zone (5) comprises a slot (8).
7. Le ressort moteur (1 ) selon l'une des revendications 2 à 6, comprenant un matériau métallique et dans lequel la zone de tangence (5) a subi un traitement thermique local de façon à en réduire la résistance en flexion. 7. The mainspring (1) according to one of claims 2 to 6, comprising a metallic material and wherein the tangency zone (5) has undergone a local heat treatment so as to reduce the flexural strength.
8. Le ressort moteur (1 ) selon l'une des revendications 1 à 7, dans lequel, lorsque le ressort moteur (1) est monté dans le barillet (30), l'extrémité externe (7) est également en contact avec la surface intérieure du tambour (31 ) selon au moins un plan tangent à l'extrémité externe (7). 8. The mainspring (1) according to one of claims 1 to 7, wherein, when the mainspring (1) is mounted in the barrel (30), the outer end (7) is also in contact with the inner surface of the drum (31) in at least one plane tangential to the outer end (7).
9. Le ressort moteur (1 ) selon l'une des revendications 1 à 8, dans lequel, lorsque le ressort moteur (1 ) est monté dans le barillet (30), une portion fléchie (10) s'étendant de la zone de tangence (5) jusqu'à extrémité externe (7) est en contact avec la surface intérieure du tambour (31 ) de façon tangente à la portion fléchie (10). 9. The mainspring (1) according to one of claims 1 to 8, wherein, when the mainspring (1) is mounted in the barrel (30), a bent portion (10) extending from the zone of tangency (5) to the outer end (7) is in contact with the inner surface of the drum (31) tangentially to the bent portion (10).
10. Le ressort moteur (1 ) selon la revendication 9, 10. The mainspring (1) according to claim 9,
dans lequel la portion fléchie (10) a une courbure de même sens ou de sens opposé à la seconde courbure de la seconde portion de ressort (4). wherein the bent portion (10) has a curvature in the same or opposite direction to the second curvature of the second spring portion (4).
1 1 . Le ressort moteur (1 ) selon la revendication 9 ou 10, 1 1. The mainspring (1) according to claim 9 or 10,
dans lequel la zone de tangence (5) s'étend sur une partie de la seconde portion de ressort (4) correspondant à environ 10% de la circonférence du tambour (30) de barillet dans lequel le ressort est destiné à être monté. wherein the tangent region (5) extends over a portion of the second spring portion (4) corresponding to about 10% of the circumference of the barrel drum (30) in which the spring is to be mounted.
12. Le ressort moteur (1 ) selon l'une des revendications 1 à 1 1 , comportant une bride glissante (14) s'étendant le long de la seconde portion de ressort (4). 12. The mainspring (1) according to one of claims 1 to 1 1, comprising a sliding flange (14) extending along the second spring portion (4).
13. Le ressort moteur (1 ) selon la revendication 12, 13. The mainspring (1) according to claim 12,
dans lequel la zone de tangence (5) s'étend à partir de l'endroit où la bride glissante (14) n'est plus en contact avec la seconde portion de ressort (4) wherein the tangency zone (5) extends from where the sliding flange (14) is no longer in contact with the second spring portion (4)
14. Barillet moteur (30) pour montre à remontage automatique comprenant le ressort moteur (1 ) selon l'une des revendications 1 à 13. 14. Motor barrel (30) for self-winding watch comprising the mainspring (1) according to one of claims 1 to 13.
1 5. Montre à remontage automatique comprenant le barillet moteur (30) selon la revendication 14. A self-winding watch comprising the engine cylinder (30) according to claim 14.
PCT/EP2014/070548 2013-10-04 2014-09-25 Mainspring for a main barrel minimizing wear on the drum WO2015049165A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14772389.4A EP3052992A1 (en) 2013-10-04 2014-09-25 Mainspring for a main barrel minimizing wear on the drum

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH01706/13A CH708660A1 (en) 2013-10-04 2013-10-04 mainspring barrel for minimizing engine wear of the drum.
CH1706/13 2013-10-04

Publications (1)

Publication Number Publication Date
WO2015049165A1 true WO2015049165A1 (en) 2015-04-09

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EP (1) EP3052992A1 (en)
CH (1) CH708660A1 (en)
WO (1) WO2015049165A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7465933B2 (en) 2021-12-29 2024-04-11 ニヴァロックス－ファー ソシエテ アノニム Timer barrel

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB751461A (en) * 1953-10-08 1956-06-27 Reinhard Straumann Slip coupling for the spring barrel of a self-winding timepiece
US3130538A (en) * 1957-01-31 1964-04-28 Straumann Inst Ag Self-winding watch barrels
FR1473744A (en) * 1966-04-04 1967-03-17 Ghielmetti S A Spring case for self-winding watches
FR1498489A (en) * 1965-08-11 1967-10-20 Device preventing overvoltage of the mainspring of a timepiece
CH698962A2 (en) * 2008-06-10 2009-12-15 Rolex Sa Barrel spring and method for its shaping.
EP2390732A1 (en) * 2010-05-27 2011-11-30 Association Suisse pour la Recherche Horlogère Barrel spring

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB751461A (en) * 1953-10-08 1956-06-27 Reinhard Straumann Slip coupling for the spring barrel of a self-winding timepiece
US3130538A (en) * 1957-01-31 1964-04-28 Straumann Inst Ag Self-winding watch barrels
FR1498489A (en) * 1965-08-11 1967-10-20 Device preventing overvoltage of the mainspring of a timepiece
FR1473744A (en) * 1966-04-04 1967-03-17 Ghielmetti S A Spring case for self-winding watches
CH698962A2 (en) * 2008-06-10 2009-12-15 Rolex Sa Barrel spring and method for its shaping.
EP2390732A1 (en) * 2010-05-27 2011-11-30 Association Suisse pour la Recherche Horlogère Barrel spring

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7465933B2 (en) 2021-12-29 2024-04-11 ニヴァロックス－ファー ソシエテ アノニム Timer barrel

Also Published As

Publication number Publication date
EP3052992A1 (en) 2016-08-10
CH708660A1 (en) 2015-04-15

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