EP3822708A1 - Uhrwerkmechanismus, der eine antriebsvorrichtung zum drehen eines organs durch ein anderes umfasst - Google Patents

Uhrwerkmechanismus, der eine antriebsvorrichtung zum drehen eines organs durch ein anderes umfasst Download PDF

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Publication number
EP3822708A1
EP3822708A1 EP20191752.3A EP20191752A EP3822708A1 EP 3822708 A1 EP3822708 A1 EP 3822708A1 EP 20191752 A EP20191752 A EP 20191752A EP 3822708 A1 EP3822708 A1 EP 3822708A1
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EP
European Patent Office
Prior art keywords
circle
male element
diameter
members
inscribed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20191752.3A
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English (en)
French (fr)
Inventor
Didier VUILLEMIN
Jean-Baptiste LE BRIS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Patek Philippe SA Geneve
Original Assignee
Patek Philippe SA Geneve
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 Patek Philippe SA Geneve filed Critical Patek Philippe SA Geneve
Publication of EP3822708A1 publication Critical patent/EP3822708A1/de
Pending legal-status Critical Current

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B1/00—Driving mechanisms
    • G04B1/10—Driving mechanisms with mainspring
    • G04B1/16—Barrels; Arbors; Barrel axles
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • 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
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/021—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft

Definitions

  • the present invention relates to a watch mechanism comprising at least two members and a device for driving in rotation one of said members by the other comprising a male element carried by one of said members and a female element carried by the other. said members and arranged to cooperate with said male element.
  • Such a drive device is for example used to transmit a torque from a ratchet to a barrel shaft, the male element being a square provided on the barrel shaft and the female element being a square hole of corresponding shape. , with the clearance necessary for assembly, hollowed out in the ratchet board and in which fits the square of the barrel shaft.
  • a square has sharp edges, so that the interface between the two members can be damaged, the contact being made between edges and surfaces.
  • the stresses linked to the contact between edges and surfaces are concentrated at the level of the interface. Consequently, when the torques at this interface are high, for example in the case of a barrel shaft and a ratchet stressed during a winding of a timepiece to supply said part with energy, the risk breaking the shaft at the level of the ratchet is very high when said shaft is twisted by the ratchet. This risk is increased when the diameter of the barrel shaft is reduced.
  • the contact pressure at the interface between the two members is high, so that it is not possible to use members made of a fragile material, such as silicon or ceramics.
  • the square is an assembly which requires a lot of play, which induces great imprecision, which is detrimental in certain applications. This is why a person skilled in the art avoids using a square to assemble two members between which a torque must be transmitted.
  • a square male element requires quarter turns to index the female element, which will cause additional wear when one of the members must be rotated relative to the other until the position assembly is found.
  • the present invention aims to remedy these drawbacks by proposing a device for driving in rotation a member of a watch mechanism by another member making it possible to improve the mechanical strength of the member subjected to torsion by the other member. , in order to increase the torque transmitted before breaking.
  • the present invention also aims to provide a device for driving in rotation a member of a watch mechanism by another member making it possible, in addition to increasing the torque transmitted before breaking, to reduce the contact pressure at the interface. in order to guarantee the integrity of the organs.
  • the present invention relates to a watch mechanism comprising at least two members and a device for driving in rotation one of said members by the other comprising a male element carried by one of said members and a female element carried. by the other of said members and arranged to cooperate with said male element.
  • the male element has, in cross section, a shape generally defining a first outer circle of outer diameter D and of center C and comprising at least one flat or a hollow, symmetrical with respect to an axis passing through the center C of the outer circle, and directed towards the center C so as to be tangent to a second inscribed inner circle of center C and of inscribed diameter d such that the difference between the outer diameter D and the inscribed diameter d is greater than or equal to 8% and strictly less than 20% of the outside diameter D.
  • the female element has, in cross section, the same shape as that of the male element arranged to receive and cooperate with said male element in order to transmit a torque from one to the other. of said organs.
  • the shape presented by the male and female elements according to the invention makes it possible to transmit more torque before breaking from one member to the other than a square.
  • the hollow is circular and has a radius defining a point equal to the sum of the radius of the inner inscribed circle and the radius of the circular hollow, said point being less than 300% of the radius of the inner inscribed circle.
  • This shape presented by the male and female elements according to the invention also makes it possible to minimize the contact pressure at the interface of the components, and thus to be able to use fragile materials for their construction.
  • the present invention also relates to a timepiece comprising a mechanism as defined above.
  • the present invention also relates to timepiece equipment comprising a mechanism as defined above.
  • the present invention relates to a watch mechanism comprising at least two members 1, 2 and a device for driving in rotation one of said members by the other comprising a male element carried by one of said members and a female element carried by the other of said members and arranged to cooperate with said male element, one of said members 1, 2 rotating the other member.
  • the member 1 is a shaft or a rod defining a longitudinal axis and carrying at its end the male element 1a and the member 2 has a hollowed out indentation constituting the female element 2a in which the element male 1a is introduced to ensure torque transmission.
  • the member 1 is for example a barrel shaft, the member 2 being a ratchet arranged to be mounted on the end of the barrel shaft, as shown in the figure. figure 1 , in order to transmit a torque to the barrel shaft, by means of the winding stem actuated by a user, allowing the winding of the timepiece.
  • the members 1 and 2 carrying the male and female elements can be formed by other pairs of watch members, such as a winding stem and its sliding pinion, or a winding stem and a cooperating key. with the winding stem for winding and / or setting the time a timepiece, or any other component of the watch mechanism and a tool provided to cooperate with said component.
  • the element the male can be carried by the driven member, the female element being provided on the driving member, or conversely the male element can be carried by the driving member, the female element then being provided on the driven member.
  • the male element 1a is cut and shaped at the end of the member 1 so that it has, in cross section, a shape generally defining an outer circle 4 of outer diameter D and of center C, its outer contour being partially coincident with said outer circle 4, and comprising, opening out at its outer periphery, at least one hollow 6 corresponding to a first embodiment according to figures 4 and 5 , or at least one dish 6 corresponding to a second embodiment according to figure 9 , symmetrical with respect to an axis 8 passing through the center C of the outer circle 4.
  • the hollow 6 may be of circular shape, of radius R, and of center C 'located outside the outer circle 4.
  • the hollow 6 may have another shape, for example a V-shaped polygonal shape with two sides or a U-shaped shape with three identical or different sides.
  • the hollow or the flat 6 is directed towards the center C so as to be tangent to an inner inscribed circle 10 of center C, concentric to the outer circle 4, and of inscribed diameter d such that the difference between the outer diameter D and the diameter inscribed d is greater than or equal to 8% and less than 20% of the outside diameter D.
  • said hollow 6 is concave and directed towards the center C, towards the inside of the male element 1a, so as to present an apex 6a defining said inner inscribed circle 10, said apex 6a of the hollow 6 being defined as the point of hollow 6 which is tangent to the inner inscribed circle 10.
  • the difference between the outside diameter D and the inscribed diameter d is between 10% and 19% of the outside diameter D, and more preferably between 12% and 19% of the outside diameter D, and more specifically between 13% and 15%. % of the outside diameter D in the case of a dish.
  • the outer diameter D preferably corresponds to the diameter of the shaft 1, which may be of the order of 1 mm for a barrel shaft.
  • the hollow 6 when the hollow 6 is circular in shape, its radius R defines a point P equal to the sum of the radius of the inner inscribed circle 10 and the radius R of the circular hollow 6.
  • said point P may be less than 300%, and preferably less than 200%, of the radius of the inner inscribed circle 10.
  • said point P is less than 150% of the radius of the inner inscribed circle 10.
  • the circular hollow 6 may have a radius R chosen so that the center C 'of said circular hollow 6 is situated between the inner inscribed circle 10 and the outer circle 4, as shown in FIG. figure 7 .
  • the cross-sectional shape of the male element 1a comprises at least two hollows or plates 6, identical, arranged around the inner inscribed circle 10 sufficiently close to one of the l 'other to form between them a convex radial protuberance 12, connecting them to each other by their opposite edges.
  • Said protuberance 12 therefore extending in the direction of the outside of the male element 1a along an axis 14 passing through the center C of the outer circle 4, said protuberance 12 being symmetrical with respect to said axis 14.
  • the protuberance 12 has an apex 12a coincides with an arc of a circle of the outer circle 4.
  • a protuberance 12 having an apex 12a coincident with with an arc of the outer circle 4 is particularly advantageous in terms of manufacturing and machining precision. The same applies to the corresponding protuberance 18 of the female element 2a.
  • the arc of a circle, defined by the angular sector ⁇ (cf. figure 5 ) corresponding to the width of the protuberances 12 is such that the angle ⁇ is between 5 ° and 340 °, preferably greater than or equal to 10 °, even more preferably greater than or equal to 15 °, preferably greater than or equal to 20 °, depending on the number of protrusions and hollows or flats.
  • the angle ⁇ is between 10 ° and 50 °, and between 20 ° and 40 ° for a configuration with four protrusions and four flats as shown on figure 9 .
  • the imprint made in the member 2 constituting the female element 2a has, in cross section, the same shape as that of the male element 1a defined above, arranged to receive and cooperate with said male element 1a in order to transmit a torque from one to the other of said members 1 and 2.
  • the female element 2a comprises alternately hollows 16 and protuberances 18 contiguous by their two sides to one of these hollows 16, the hollows 16 having the same shape as the hollows 6 described above and the hollows 6. protrusions 18 having the same shape as the protrusions 12 described above, so that the female element 2a follows the contours of the male element 1a over its entire cross section, said male element 1a fitting together or s 'fitting perfectly into the female element 2a. Only the dimensions of the female element 2a are adapted so as to provide the clearance just necessary for mounting the male element 1a in the female element 2a.
  • the shape and dimensions of the cross section of the female element 2a are advantageously chosen. so that the adjustment between the male 1a and female 2a elements is tighter at the level of the arcuate portions that include the protuberances 12, 18. In fact, the machining of these portions is very precise and a tight fit to this level therefore promotes good concentricity of the male 1a and female 2a elements. This results in improved constant torque transmission. This is particularly advantageous in the case where the member 1 is a barrel shaft and the member 2 a ratchet, and even more particularly when such members are used in a series assembly of barrels.
  • More play can typically be left between the male 1a and female 2a elements at the level of the other portions of the outline of said elements 1a, 2a, in particular at the level of the portions comprising flats such as flats 6, the machining of which is generally less. precise, as shown in figure 9 .
  • the male element 1a and the female element 2a comprise at least three hollows or flats 6, 16 alternating with at least three protuberances 12, 18 respectively, regularly distributed around their respective inner inscribed circle.
  • the male element 1a and the female element 2a comprise between four and eight hollows or dishes 6, 16 regularly distributed around their respective inner inscribed circle, and preferably at least five hollows 6, 16 and five protuberances 12, 18.
  • the male element 1a and the female element 2a comprise six recesses 6, 16 alternating with six protuberances 12, 18, regularly distributed around their respective inner inscribed circle, as shown. on the figures 1 to 7 .
  • the male element 1a and the female element 2a comprise four plates 6, 16 alternating with four protuberances 12, 18, regularly distributed around their respective inner inscribed circle, as shown in the figures. figures 8 and 9 .
  • the two embodiments of the invention can be combined so that the male element and its corresponding female element can respectively have in cross section a shape which comprises at least one hollow and at least one flat.
  • the hollows may be different from one another, while respecting the conditions of the inner inscribed circle.
  • the protuberances 12 form longitudinal ridges 20 connected to the surface of the body of the shaft 1 and the hollows or flats 6 are connected to the surface of the body of the shaft by shoulders 22, as shown. the figure 2 .
  • the shoulders 22 serve as stops to block the member 2 mounted on the member 1 in position.
  • the figures 5 to 7 show different variants of the first embodiment of the invention, obtained by varying the difference between the outside diameter D and the inscribed diameter d as well as the pointing, the male and female elements having six recesses 6 alternating with six protuberances 12, regularly distributed around the inner inscribed circle 10.
  • the angle ⁇ (cf. figure 5 ) between the tangent passing through the point of connection of a hollow 6 and the adjacent protuberance 12 and the axis of symmetry 14 of said adjacent protuberance 12 is greater than 22 ° and preferably greater than 25 °.
  • the difference between the outside diameter D and the inscribed diameter d is 18%, and in the variant of the figure 6 , the difference between the outside diameter D and the inscribed diameter d is 14%.
  • the pointing P is less than 200% of the radius of the inner inscribed circle 10.
  • the pointing P is less than 150% of the radius of the inner inscribed circle 10. More specifically, the pointing P of the variant of the figure 7 , for which the center C 'of the circular hollow 6 lying between the inner inscribed circle 10 and the outer circle 4, is of the order of 120% of the radius of the inner inscribed circle 10.
  • the torque transmitted before rupture of the barrel shaft for the male / female elements of the present invention is greater than that obtained with the comparative male / female elements of square shape.
  • the male / female elements of the present invention therefore make it possible to increase the strength of the member carrying the male element with respect to a square assembly traditionally used in watchmaking.
  • the contact pressure for the male / female members of the present invention is lower than that obtained with the comparative square shaped male / female members.
  • the male / female elements of the present invention therefore make it possible to reduce the contact pressure at the interface of the components 1 and 2 compared to a square assembly traditionally used in watchmaking. Wear at the interface of components 1 and 2 is therefore reduced.
  • the variant of the figure 6 which has a difference between the outside diameter D and the inscribed diameter d less than that of the figures 5 and 7 makes it possible to obtain a torque transmitted before breaking greater than that obtained with the variants of figures 5 and 7 .
  • the variant of the figure 7 makes it possible to obtain a contact pressure lower than that obtained with the variant of the figure 5 .
  • the indexing of the members 1 and 2 for example the indexing of the ratchet relative to the barrel shaft, will be easier than with a square assembly.
  • the identical shapes of the cross section of the male element and of the female element make it possible to improve the guidance between these elements, for example compared to a conventional coupling using a shaft and a ratchet having a square-shaped hole.
  • the square coupling causes a lot of play while with the present invention, the play is tightened, the flatness of the ratchet on the shaft for example being improved.
  • the mechanism of the invention can be used for two organs incorporated in a movement or when one of the organs is incorporated in the movement and the other organ being external to the movement, such as a winding rod and a key cooperating with the winding stem for winding and / or setting the time a timepiece, or any other component of the watch mechanism and a tool provided to cooperate with said component, such as a screw provided in the movement and a screwdriver arranged to cooperate with the screw, the assembly then constituting watchmaking equipment.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission Devices (AREA)
EP20191752.3A 2019-08-20 2020-08-19 Uhrwerkmechanismus, der eine antriebsvorrichtung zum drehen eines organs durch ein anderes umfasst Pending EP3822708A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19192667 2019-08-20

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EP3822708A1 true EP3822708A1 (de) 2021-05-19

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EP20191752.3A Pending EP3822708A1 (de) 2019-08-20 2020-08-19 Uhrwerkmechanismus, der eine antriebsvorrichtung zum drehen eines organs durch ein anderes umfasst

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR376790A (fr) * 1907-04-16 1907-08-20 Mueller-Schlenker Fa Dispositif de remontage pour pendules avec mécanisme de mouvement et de réveil combiné
CH699318A2 (fr) * 2008-08-15 2010-02-15 Nivarox Sa Système d'engrenage pour une pièce d'horlogerie.
CH713389A1 (fr) * 2017-01-27 2018-07-31 Richemont Int Sa Système de liaison d'un arbre à une pièce.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR376790A (fr) * 1907-04-16 1907-08-20 Mueller-Schlenker Fa Dispositif de remontage pour pendules avec mécanisme de mouvement et de réveil combiné
CH699318A2 (fr) * 2008-08-15 2010-02-15 Nivarox Sa Système d'engrenage pour une pièce d'horlogerie.
CH713389A1 (fr) * 2017-01-27 2018-07-31 Richemont Int Sa Système de liaison d'un arbre à une pièce.

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