CH709348A1 - ball bearing type with four points of contact and method of manufacturing such a bearing. - Google Patents

ball bearing type with four points of contact and method of manufacturing such a bearing. Download PDF

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Publication number
CH709348A1
CH709348A1 CH00351/14A CH3512014A CH709348A1 CH 709348 A1 CH709348 A1 CH 709348A1 CH 00351/14 A CH00351/14 A CH 00351/14A CH 3512014 A CH3512014 A CH 3512014A CH 709348 A1 CH709348 A1 CH 709348A1
Authority
CH
Switzerland
Prior art keywords
bearing
cone
characterized
annular flat
lower cone
Prior art date
Application number
CH00351/14A
Other languages
French (fr)
Inventor
François Huguelet
Mickael Risold
Original Assignee
Hl Technology 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 Hl Technology Sa filed Critical Hl Technology Sa
Priority to CH00351/14A priority Critical patent/CH709348A1/en
Publication of CH709348A1 publication Critical patent/CH709348A1/en

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Classifications

    • GPHYSICS
    • G04HOROLOGY
    • G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B5/00Automatic winding up
    • G04B5/02Automatic winding up by self-winding caused by the movement of the watch
    • G04B5/18Supports, suspensions or guide arrangements, for oscillating weights

Abstract

The invention relates to a bearing (10) and a method of manufacturing this ball bearing (10) of the four-point contact type, used in the field of watchmaking, in particular to define a center of rotation of a oscillating weight of a mechanical drive watch movement. The mechanical parts of said bearing (10) comprise an upper cone (12), a lower cone (13), an intermediate ring (14) for positioning balls (15) and a ring gear (28) provided with a central recess ( 29) in which are disposed said upper cone (12), said lower cone (13) and said intermediate ring (14), all of said mechanical parts being made by stamping and / or stamping without machining with removal of material, and assemblies by juxtaposition / interlocking to constitute said bearing (10).

Description

Technical area

The present invention relates to a bearing, in particular a ball bearing type four contact points, used in the field of watchmaking, in particular to define a center of rotation of an oscillating weight of a movement of mechanical drive watch, this bearing comprising a set of mechanical parts assembled together to form a ball path defining said four points of contact.

The present invention also relates to a method of manufacturing a bearing, in particular a ball bearing type four contact points, commonly used in the field of watchmaking in particular to define the center of rotation of the mass oscillating movement of a watch with mechanical drive.

This type of bearing, said bearing four points of contact is an essential part of mechanically driven watch movements, since they serve as support and guidance to the oscillating mass which ensures the supply of energy some movement.

Prior art

Historically the oscillating masses were mounted on a pivot point consisting of cut stones whose machining was laborious and relatively inaccurate. As a result, the movement itself was a strong consumer of energy, thereby reducing the energy autonomy of the watch. Thanks to an invention of the RMB company, this type of assembly has been replaced by a device called a "four-point contact bearing" to constitute the pivot point of the oscillating mass. This improvement has resulted in the improvement of the efficiency of the mechanism and its dimensional reduction, thus making it possible to obtain a better compactness of the component.

[0005] Other improvements have been made, in particular the replacement of the metal balls by ceramic balls to avoid micro-welding and consequently the stresses due to lubrication.

All the achievements of the original invention have always been based on a bearing construction with four contact points obtained by means of three parts, one of which provides two contact points on the outside of the bearing and two other parts ensuring the closing of the raceway of the balls and the support by means of two other points of contact on the inner part. Variations of embodiments, for specific applications, have been proposed in the form of axial constructions with two parts each providing two of the four points of contact.

All these embodiments of bearings use machining techniques of the type bar turning, that is to say by removal of chips that correspond to slow production processes, expensive, usually in two phases, namely a first phase of machining followed by a second phase of grinding, to achieve the required accuracy, and a curing heat treatment of the steel to achieve the necessary hardness in the bearing area of the balls. These techniques make the parts are manufactured one by one, which increases the constraints and increases the production costs.

The particularity of four-point contact bearings used in the watch industry is that, unlike other areas, even particularly sensitive areas because of the low tolerances imposed, for example avionics, the bearings are no longer subject to any recovery. grinding or grinding after the heat treatment.

In summary, bearings of the four-point contact type for the watch industry have many defects, both from the point of view of the production technique, as regards the quality of the products obtained and the cost of manufacturing, related to the removal of chips and quenching for hardening of the contact areas, resulting in loss of precision and decreasing the final performance of the movement.

Presentation of the invention.

The present invention proposes to overcome these disadvantages by performing a rolling type of four points of contact, resulting from a manufacturing process to avoid chip removal and based on mechanical parts manufacturing techniques. authorizing mass production and finishing treatments.

This goal is. achieved by the bearing according to the invention, as defined by the preamble and characterized in that said mechanical parts comprise an upper cone, a lower cone, an intermediate ring for positioning balls and a ring gear provided with a central recess in which are disposed said upper cone, said lower cone and said intermediate ring, all of said mechanical parts being made by stamping and / or stamping without machining with removal of material, in that they are hardened by work hardening and assembled by juxtaposition / interlocking to form said bearing, said bearing being mounted in a central recess of said oscillating mass.

According to a preferred embodiment, said upper cone is an annular piece having a central circular opening, an annular flat upper surface, a peripheral flange of frustoconical shape, connected at its top to an annular flat surface parallel to said surface. an annular planar upper surface extended in the opposite direction to said upper surface by a narrowed section rim which is connected to an annular flat bottom surface parallel to the annular flat upper surface.

In a particularly advantageous manner, said lower cone is a frustoconical shaped piece having a central circular opening, an annular flat upper surface, a frustoconical peripheral flank connected to its wide base to an annular flat surface, parallel to said annular flat upper surface.

Preferably, said intermediate ball positioning ring has a central circular opening whose diameter is substantially equal to, or slightly greater than the diameter of the rim of the upper cone.

According to an advantageous construction, said intermediate ball positioning ring is disposed between said flat annular bottom surface of the upper cone and said flat annular upper surface of the lower cone.

[0016] Said ring gear is advantageously provided with a central recess for centrally housing the lower cone and the intermediate ring.

[0017] Said ring gear preferably has a thickness substantially equal to that of the lower cone increased by half the thickness of the intermediate ball positioning ring.

The method according to the invention as defined in the preamble is characterized in that said mechanical parts are made by stamping and / or stamping without machining with removal of material, in that they are hardened by work hardening and assembled by juxtaposition / nesting to form said bearing.

Preferably, said upper cone, said intermediate ring and said lower cone are assembled by crimping, this assembly being held in the ring gear by a retaining ring.

Brief description of the drawings

The present invention and its advantages will be better understood on reading the detailed description of preferred embodiments of the device, with reference to the appended drawings given by way of non-limiting indication, in which: <tb> fig. 1 <SEP> represents an exploded perspective view of a preferred embodiment of the bearing according to the invention, representing its various components and the oscillating weight that it carries, and <tb> fig. 2 <SEP> represents a cross-sectional view of the bearing of FIG. 1.

Best ways to achieve the invention

With reference to the figures, and in particular to FIG. 1, the bearing 10 shown, carries an oscillating mass 11 which it is the point of oscillation or, in other words, which it defines the pivot axis. The bearing 10 itself is composed of an upper cone 12 and a lower cone 13 which are separated by an intermediate ring 14 for positioning balls 15. In the example shown, the balls 15 are five in number and the intermediate ring 14 has five equidistant recesses 16 distributed around the periphery of said intermediate ring 14, to accommodate the balls 15 and keep them spaced apart as well.

The upper cone 12 is an annular piece having a central circular opening 17, an annular flat upper surface 18, a frustoconical peripheral flank 19, connected at its top to an annular flat surface 20, parallel to said planar upper surface. annular 18. Said flat annular surface 20 extends, in the direction opposite to said upper surface 18, by a rim 21 of narrowed section which is connected to an annular flat bottom surface 22, parallel to the flat annular upper surface 18. The cone upper 12 is intended to be placed in a central recess 11a of the oscillating mass 11.

Said intermediate ring 14 ball positioning 15 comprises a central circular opening 23 whose diameter is substantially equal to, or slightly larger than the diameter of the rim 21 of the upper cone 12. Its thickness is substantially equal to the height of the rim 21. Said intermediate ring 14 is placed on said annular flat surface 20 and said rim 21 is engaged in its central circular opening 23 so that it fits exactly in the annular space formed in the extension of the top of the peripheral flank. of frustoconical shape 19.

The lower cone 13 is a frustoconical shaped piece having a central circular opening 24, an annular flat upper surface 25, a frustoconical peripheral flank 26, connected at its broad base to an annular flat surface 27, parallel to said flat annular upper surface 25 of the lower cone 13. When the parts are assembled, the annular flat upper surface 25 bears against the lower face of the intermediate ring 14, and the upper face of said intermediate ring 14 bears against the surface annular flat bottom 22 of the upper cone 12.

The bearing 10 further comprises a ring gear 28 whose thickness is substantially equal to that of the lower cone 13 increased by half the thickness of the intermediate ring 14 for positioning balls 15. It is provided with a central recess 29 for centrally housing the lower cone 13 and the intermediate ring 14. The upper cone 12 is housed in the central recess 11a of the oscillating mass 11, and connected to the lower cone 13. The ring gear 28 comprises on a part of the inner edge of the central recess 29, a conical flank 30 which, after assembly of the components, will be opposed to the frustoconical peripheral flank 26 of the lower cone 13 to define a lower part of the raceway of the balls 15.

The axial sectional view of FIG. 2 shows the relative positions of the various components of the bearing 10 and that of the oscillating mass 11 coupled to said bearing 10. The lower half of the raceway of the balls 15 consists of the frustoconical peripheral flank 26 of the lower cone 13 and the inner flank conic 30 of the central recess 29 of the ring gear 28. The upper half of the raceway of the balls 15 consists of the frustoconical peripheral flank 19 of the raceway 15 of the balls of the upper cone 12 and a conical surface 31 which borders the central recess 11a of the oscillating mass 11, this surface being disposed facing said frustoconical flank 19. When the components of the bearing are assembled, the raceways of the balls are defined and the balls are in position at the inside of these raceways.

The manufacturing process of the bearing 10 is performed very simply and quickly by stamping and / or mechanical stamping components in a steel sheet having the required hardness qualities. This technique is much faster than conventional machining techniques by material removal and much less expensive. The hardening is achieved by hardening so that the parts, namely the upper cone 12, the lower cone 13, the intermediate ring 14, the ring gear 28 and a closure member 31 disposed partially above the raceway of the balls 15, are fully finished and ready for assembly. The assembly is carried out by nesting crimping of the various components, after their heat treatment of final hardening. The main components of the bearing 10, namely the upper cone 12, the intermediate ring 14 and the lower cone 32 are preferably assembled by crimping and this assembly is held in position, after being engaged in the groove which borders the 11a central recess of the oscillating mass 11, by a retaining ring (32).

Note that all the parts that form the components of the bearing 10 are made by stamping or equivalent, either stamping or punch cutting, which allows mass production by means of a tool easy to achieve.

The present invention is not limited to the embodiment described, but may vary while remaining within the scope defined by the claims, with respect to both the manufacturing process that the actual construction of the bearing according to this method.

Claims (9)

1. Bearing (10), in particular a four-point contact ball bearing, used in the field of watchmaking, in particular for defining a center of rotation of an oscillating weight of a driving watch movement mechanical, this bearing comprising a set of mechanical parts assembled together to form a ball path defining said four points of contact, characterized in that said mechanical parts comprise an upper cone (12), a lower cone (13), an intermediate ring (14) for positioning balls (15) and a ring gear (28) provided with a central recess (29) in which are disposed said upper cone (12), said lower cone (13) and said intermediate ring (14), all of said mechanical parts being made by stamping and / or stamping without machining with removal of material, in that they are hardened by work hardening and assembled by juxtaposition / interlocking to form said bearing (10), said bearing being mounted in a central recess (11a) of said oscillating mass (11).
2. Bearing according to claim 1, characterized in that said upper cone (12) is an annular piece having a central circular opening (17), an annular flat upper surface (18), a frustoconical peripheral flank (19), connected at its apex to an annular flat surface (20), parallel to said annular flat upper surface (18), extended in the direction opposite to said upper surface (18) by a narrowed section rim (21) which is connected an annular flat bottom surface (22) parallel to the flat annular upper surface (18).
3. Bearing according to claim 1, characterized in that said lower cone (13) is a frustoconical shaped piece having a central circular opening (24), an annular flat upper surface (25), a frustoconical peripheral flank (26). ), connected at its wide base to an annular flat surface (27), parallel to said annular flat upper surface (25).
4. Bearing according to claim 1, characterized in that said intermediate ring (14) for positioning balls (15) has a central circular opening (23) whose diameter is substantially equal to, or slightly greater than, the diameter of the rim ( 21) of the upper cone (12).
Bearing according to claim 4, characterized in that said intermediate bead locating ring (14) is disposed between said annular flat bottom surface (22) of the upper cone (12) and said annular flat top surface (25). ) of the lower cone (13).
6. Bearing according to claim 1, characterized in that said ring gear (28) is provided with a central recess (29) for centrally housing the lower cone (13) and the intermediate ring (14).
7. Bearing according to claim 6, characterized in that said ring gear (28) has a thickness substantially equal to that of the lower cone (13) increased by half the thickness of the intermediate ring (14) ball positioning (15).
8. A method of manufacturing a bearing (10), in particular a four-point contact ball bearing, used in the field of watchmaking, in particular to define a center of rotation of an oscillating weight of a mechanical-powered watch movement, this bearing comprising a set of mechanical parts assembled together to form a ball path defining said four points of contact, characterized in that said mechanical parts are made by stamping and / or stamping without machining with removal of material, in that they are hardened by work hardening and assembled by juxtaposition / interlocking to form said bearing (10).
9. A method of manufacturing a bearing (10) according to claim 8, characterized in that said upper cone (12), said intermediate ring (14) and said lower cone (13) are assembled by crimping, this assembly being held in the ring gear (28) by a retaining ring (32).
CH00351/14A 2014-03-10 2014-03-10 ball bearing type with four points of contact and method of manufacturing such a bearing. CH709348A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH00351/14A CH709348A1 (en) 2014-03-10 2014-03-10 ball bearing type with four points of contact and method of manufacturing such a bearing.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00351/14A CH709348A1 (en) 2014-03-10 2014-03-10 ball bearing type with four points of contact and method of manufacturing such a bearing.
CH00324/15A CH709330A2 (en) 2014-03-10 2015-03-09 A method of manufacturing a ball bearing type and four-point contact bearing made by this process.

Publications (1)

Publication Number Publication Date
CH709348A1 true CH709348A1 (en) 2015-09-15

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CH00351/14A CH709348A1 (en) 2014-03-10 2014-03-10 ball bearing type with four points of contact and method of manufacturing such a bearing.
CH00324/15A CH709330A2 (en) 2014-03-10 2015-03-09 A method of manufacturing a ball bearing type and four-point contact bearing made by this process.

Family Applications After (1)

Application Number Title Priority Date Filing Date
CH00324/15A CH709330A2 (en) 2014-03-10 2015-03-09 A method of manufacturing a ball bearing type and four-point contact bearing made by this process.

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2109451A5 (en) * 1970-10-16 1972-05-26 Rks Pasquier
EP1046965A1 (en) * 1999-04-23 2000-10-25 Montres Rolex Sa Self-winding watch
CH699142B1 (en) * 2005-03-29 2010-01-29 Technotime S A Removable bearing for oscillating weight in automatic mechanical clock movement of wrist watch, has ruby band pivoted freely around ring while being integrated to central arbor and support bridge, where arbor is penetrated into bridge
CH703964A1 (en) * 2010-10-26 2012-04-30 Soprod Sa Automatic winding movement for watch, has gear train with input mobile kinematically coupled to oscillating weight through return mobile, where return mobile is arranged between indicator closest to plate and input mobile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2109451A5 (en) * 1970-10-16 1972-05-26 Rks Pasquier
EP1046965A1 (en) * 1999-04-23 2000-10-25 Montres Rolex Sa Self-winding watch
CH699142B1 (en) * 2005-03-29 2010-01-29 Technotime S A Removable bearing for oscillating weight in automatic mechanical clock movement of wrist watch, has ruby band pivoted freely around ring while being integrated to central arbor and support bridge, where arbor is penetrated into bridge
CH703964A1 (en) * 2010-10-26 2012-04-30 Soprod Sa Automatic winding movement for watch, has gear train with input mobile kinematically coupled to oscillating weight through return mobile, where return mobile is arranged between indicator closest to plate and input mobile

Also Published As

Publication number Publication date
CH709330A2 (en) 2015-09-15

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