EP3051364B1 - Mechanisches übertragungssystem durch haftung für die uhrmacherei. - Google Patents

Mechanisches übertragungssystem durch haftung für die uhrmacherei. Download PDF

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Publication number
EP3051364B1
EP3051364B1 EP15153054.0A EP15153054A EP3051364B1 EP 3051364 B1 EP3051364 B1 EP 3051364B1 EP 15153054 A EP15153054 A EP 15153054A EP 3051364 B1 EP3051364 B1 EP 3051364B1
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EP
European Patent Office
Prior art keywords
wheel
mechanical transmission
wheels
hub
friction
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.)
Active
Application number
EP15153054.0A
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English (en)
French (fr)
Other versions
EP3051364A1 (de
Inventor
Gabriel Chevallier
Frédéric Georges
Xavier LANDREAU
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.)
Cartier International AG
Original Assignee
Cartier International AG
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.)
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Publication date
Application filed by Cartier International AG filed Critical Cartier International AG
Priority to EP15153054.0A priority Critical patent/EP3051364B1/de
Publication of EP3051364A1 publication Critical patent/EP3051364A1/de
Application granted granted Critical
Publication of EP3051364B1 publication Critical patent/EP3051364B1/de
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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
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots

Definitions

  • the present invention relates to a mechanical transmission system by adhesion for a clockwork train.
  • the present invention aims to remedy this problem and proposes for this purpose a mechanical transmission system for a watchwheel comprising a first wheel without teeth and a second wheel without teeth in contact with each other so that the one can drive the other by adhesion, characterized in that the first wheel comprises a hub, a peripheral portion in contact with the second wheel and elastic arms connecting the hub to the part peripheral, the resilient arms being arranged to press the peripheral portion against the second wheel.
  • the resilient arms are regularly distributed around the hub.
  • the resilient arms are v-shaped.
  • the coefficient of friction of the pair of materials in which the first and second wheels are made is at least 0.5, preferably at least 0.7.
  • the materials of the first and second wheels may be the same or different.
  • the first wheel and / or the second wheel are for example made of steel, nickel, nickel-phosphorus, titanium or titanium alloy, aluminum or aluminum alloy, silver or silver alloy, of a material epoxy-based composite or polymer.
  • the present invention further provides a watchwheel comprising a mechanical transmission system as defined above, and a watch movement comprising such a watchwheel.
  • a mechanical transmission system by adhesion comprises two coplanar wheels 1 and 2 in contact with each other.
  • the wheels 1, 2 are friction wheels having no teeth.
  • the first wheel 1 is also a game-catching wheel, as explained below.
  • the first wheel 1 is a large wheel and the second wheel 2 is a small wheel or pinion, but it could be otherwise. Any one of the two wheels 1, 2 can drive the other wheel by adhesion.
  • the first wheel 1 is recessed to define a hub 3, elastic arms 4 and a ring-shaped peripheral portion 5, each elastic arm 4 connecting the hub 3 to the peripheral portion 5.
  • the hub 3 serves to mount the first wheel 1 on a shaft and has for this purpose a hole 6 which can be traversed by the shaft.
  • the hub 3 can also be in one piece with the shaft.
  • the resilient arms 4 are regularly angularly distributed around the hub 3 and have a V shape.
  • the peripheral portion 5 is in contact with the peripheral portion of the second wheel 2.
  • the elastic arms 4 allow a slight displacement of the peripheral portion 5 relative to the hub 3 under the effect of radial forces.
  • the distance d between the axes of the wheels 1, 2 is thus chosen so that the elastic arms 4 are constrained by the contact between the wheels 1, 2 and press the peripheral portion 5 against the second wheel 2. In this way, the losses of adhesion due to variations in the center distance d caused by manufacturing tolerances or surface defects of the wheels 1, 2 are avoided.
  • the first wheel 1 comprises elastic arms 4, the second wheel 2 being full.
  • the second wheel 2 could have a structure similar to that of the first wheel 1.
  • the number, the geometry and the dimensions of the arms 4 defined at the design of the system make it possible to modulate the pressure force between the two wheels 1, 2 to guarantee (i) the contact between the wheels, (ii) a transmission of mechanical forces between these wheels, (iii) an acceptable yield and (iv) contact pressures lower than the strength limits of the materials constituting the wheels.
  • the figure 3 shows wheels 1 ', 2' with in particular another geometry for the arms 4 'and the hub 3'.
  • the v-shaped arms 4 or 4 ' allows them to have a great length while preserving the aesthetic appearance of the wheel 1, 1'.
  • other forms are possible for these arms.
  • the pressure force can be modulated by playing on the length and thickness of the arms.
  • the pressure force is a function of the torque to be transmitted. The higher the torque to be transmitted, the more the arms will have to be rigid.
  • the material (s) selected for making the wheels 1, 2 has (have) a high coefficient of friction, to improve the efficiency of the transmission, as well as a high yield strength and hardness, for good resistance to wear.
  • the coefficient of friction of the material pair forming the wheels 1, 2 is preferably at least 0.5 and more preferably at least 0.7.
  • the coefficient of friction can also be increased by surface micro-structuring.
  • the material chosen for the first wheel 1 also has a low deformation hysteresis, to allow rapid return of the arms 4 to their original shape, without permanent deformation.
  • Suitable materials for the wheels 1, 2 are steel, nickel, nickel-phosphorus, titanium and its alloys, aluminum and its alloys, silver and its alloys, various epoxy-based composite materials and polymers, but other materials may also be suitable.
  • each wheel 1, 2, in particular the first wheel 1 can be manufactured in one piece by spark erosion, laser machining, molding, metal injection molding (MIM) or the LIGA technique, for example.
  • the size of a traditional toothed gear can not be less than a certain limit because it is difficult to machine small teeth. Since the second wheel 2, like the first wheel 1, has no teeth, it can have a very small size to obtain a very large torque reduction ratio, for example much greater than 10, between the wheels 1, 2.
  • the mechanical transmission system by adhesion 1, 2 can be used in the finishing gear of a watch movement.
  • the Figures 4 and 5 show by way of illustration a mobile that can be part of the finishing train and comprising, around a shaft 7, a friction wheel to play catch 8 of the type of the wheel 1 and a friction wheel 9 smaller (pinion ) and full.
  • the friction wheel 8 cooperates by adhesion with a wheel of the type of the wheel 2, while the friction wheel 9 cooperates by adhesion with a wheel of the type of the wheel 1.
  • the system 1, 2 is placed as close the barrel as possible, for example by constituting the transmission system between the barrel wheel and the mobile of medium.
  • One and the same wheel may comprise several systems of the type of the system 1, 2.
  • figure 6 shows another mobile can be part of the work train and comprising, around a shaft 10, a friction wheel 11 and a gear wheel 12. Between the cylinder and the friction wheel 11, the transmissions are only by adhesion.
  • the toothed wheel 12 it cooperates with a toothed mobile side of the exhaust or directly with the mobile escape.
  • the elastic arms 4 can be drawn to have greater rigidity where the torque is the largest, that is to say say near the barrel.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Gears, Cams (AREA)

Claims (8)

  1. Mechanisches Übertragungssystem für ein Räderwerk für die Uhrmacherei, das ein erstes Rad (1) ohne Zähne und ein zweites Rad (2) ohne Zähne umfasst, die derart miteinander in Kontakt sind, dass das eine das andere durch Haftung mitnehmen kann, dadurch gekennzeichnet, dass das erste Rad (1) eine Nabe (3), einen peripheren Teil (5), der mit dem zweiten Rad (2) in Kontakt ist, und elastische Arme (4) umfasst, die die Nabe (3) mit dem peripheren Teil (5) verbinden, wobei die elastischen Arme (4) gestaltet sind, um den peripheren Teil (5) gegen das zweite Rad (2) zu drücken.
  2. Mechanisches Übertragungssystem nach Anspruch 1, dadurch gekennzeichnet, dass die elastischen Arme (4) regelmäßig um die Nabe (3) herum verteilt sind.
  3. Mechanisches Übertragungssystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die elastischen Arme (4) eine V-Form aufweisen.
  4. Mechanisches Übertragungssystem nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Reibungskoeffizient des Paares von Materialien, aus denen das erste Rad (1) und das zweite Rad (2) ausgeführt sind, mindestens 0,5 beträgt.
  5. Mechanisches Übertragungssystem nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Reibungskoeffizient des Paares von Materialien, aus denen das erste Rad (1) und das zweite Rad (2) ausgeführt sind, mindestens 0,7 beträgt.
  6. Mechanisches Übertragungssystem nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das erste Rad (1) und/oder das zweite Rad (2) aus Stahl, aus Nickel, aus Nickel-Phosphor, aus Titan oder Titanlegierung, aus Aluminium oder Aluminiumlegierung, aus Silber oder Silberlegierung, aus einem Verbundmaterial auf Epoxidharzbasis oder aus Polymer ausgeführt ist/sind.
  7. Räderwerk für die Uhrmacherei, das ein mechanisches Übertragungssystem nach einem der Ansprüche 1 bis 6 umfasst.
  8. Uhrwerk, das ein Räderwerk für die Uhrmacherei nach Anspruch 7 umfasst.
EP15153054.0A 2015-01-29 2015-01-29 Mechanisches übertragungssystem durch haftung für die uhrmacherei. Active EP3051364B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15153054.0A EP3051364B1 (de) 2015-01-29 2015-01-29 Mechanisches übertragungssystem durch haftung für die uhrmacherei.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15153054.0A EP3051364B1 (de) 2015-01-29 2015-01-29 Mechanisches übertragungssystem durch haftung für die uhrmacherei.

Publications (2)

Publication Number Publication Date
EP3051364A1 EP3051364A1 (de) 2016-08-03
EP3051364B1 true EP3051364B1 (de) 2019-05-22

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EP15153054.0A Active EP3051364B1 (de) 2015-01-29 2015-01-29 Mechanisches übertragungssystem durch haftung für die uhrmacherei.

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3407143A1 (de) 2017-05-24 2018-11-28 Rolex Sa Mechanische verbindungsvorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US230596A (en) 1880-07-27 Stem winding and setting watch
CH6659A (fr) * 1893-06-05 1893-12-30 Achille Lambert Roue pour montres
ATE463766T1 (de) * 2005-03-22 2010-04-15 Patek Philippe Sa Geneve Zusammenbau eines teils mit einer achse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3051364A1 (de) 2016-08-03

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