JP2009186394A - Bearing structure of rotating body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing structure of a rotating body that has high abrasive resistance, is simple to reduce the number of components, and reduces the manufacture cost. <P>SOLUTION: In this bearing structure of the rotating body, a bearing 25 is fixed to the inside of a receiving hole 11a formed in a support 11, shafts 81a and 81b of the rotator 8 are inserted into the support hole 25a formed in the bearing and are supported slidably, and the support 11 is made of crystal metal, and the bearing is made of metallic glass alloy. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing structure for a rotating body that slidably supports an axis of the rotating body without interposing a rolling element, and more specifically, for example, a bearing structure for a small gear used in a gear train mechanism of a wristwatch. It is suitable for.

As an electronically controlled mechanical wristwatch provided with a gear train mechanism, for example, the device disclosed in Patent Document 1 is known.
The wheel train mechanism of Patent Document 1 includes a barrel wheel incorporating a spring for storing mechanical energy, and a second wheel to a sixth wheel meshed in series to transmit the mechanical energy of the spring to the rotor of the generator. The rotation of the barrel wheel is transmitted to the second wheel, the rotation of the second wheel is increased and transmitted to the third wheel, and the rotation of the third wheel is further increased to the fourth wheel. It is transmitted from the car to the rotor via the car.

In the second wheel to the sixth wheel, a small diameter pinion and a tooth portion larger than the pinion are integrated on the outer periphery of the rotation shaft, and the rotor is a rotary inertia plate that stores rotational driving force on the outer periphery of the rotation shaft. A permanent magnet is integrated. Among these, the third wheel, the fifth wheel, the sixth wheel, and the rotor are rotatably supported by bearings provided on the main plate and the train wheel bridge arranged so as to cover them from the upper part and the lower part.
Tenons are provided to project from both ends of the rotation shafts of the third wheel, fifth wheel, sixth wheel and rotor. The bearing also includes a receiving hole formed in the main plate and the train wheel bridge, and a stone made of ruby or the like having excellent wear resistance provided with a support hole through which the tenon is inserted. It is built into the main plate and train wheel bridge by driving into the hole, and the third wheel, fifth wheel, sixth wheel and rotor tenon are inserted into the support holes of the hole stones of each bearing to support it rotatably. Yes.
JP 2003-279670 A (FIGS. 1 to 4)

By the way, the hole stone has increased the fixing force for the receiving hole by driving it with a closing margin for the receiving hole, but unless it is processed by increasing the dimensional accuracy of the outer shape of the hole stone and the inner shape of the receiving hole, Hole stones made of ruby with low cracking resistance have a problem that they are easily broken when driven.
In addition, it takes time to process the hole stone and the receiving hole, and the work of driving the hole stone into the receiving hole has to be performed at a plurality of locations, which is problematic in terms of manufacturing cost.

  Therefore, the present invention has been made paying attention to the above-mentioned unsolved problems of the conventional example, and is a bearing structure having excellent wear resistance, and is manufactured by reducing the number of components and making it a simple structure. It aims at providing the bearing structure of the rotary body which can aim at reduction of cost.

  When a raw material that is composed of a specific metal material as a main component and contains a material containing an element satisfying a predetermined condition is cooled very rapidly from a molten state, an alloy in a random amorphous state is formed before crystals are formed. May be. Such an alloy is called a “metallic glass alloy” because it has glass properties in a predetermined temperature range. Since this metallic glass alloy has wear resistance, high strength, low Young's modulus, and high corrosion resistance, it is suitable as a bearing member for various machine parts.

In order to achieve the above object, the bearing structure for a rotating body according to claim 1 of the present invention is such that a bearing is fixed inside a receiving hole formed in the support body, and the shaft of the rotating body is inserted into the support hole formed in the bearing. In the bearing structure of the rotating body that is inserted through the shaft and slidably supports the shaft, the support is made of crystalline metal, and the bearing is made of a metal glass alloy.
Thereby, since it becomes a bearing excellent in abrasion resistance, the axis | shaft of a rotary body can be reliably supported over a long period of time.

According to the second aspect of the present invention, the bearing is fixed inside the receiving hole formed in the support, and the shaft of the rotating body is inserted into the support hole formed in the bearing so that the shaft is slidably supported. In the bearing structure of the rotating body thus formed, both the support and the bearing were formed of a metallic glass alloy.
Thereby, both a support body and a bearing can be made into the member excellent in abrasion resistance.
According to a third aspect of the present invention, in the bearing structure of the rotating body according to the first or second aspect, one of the inner surface of the receiving hole and the outer surface of the bearing is an undercut surface, and the other surface is connected to the undercut surface. Was in surface contact.

Thereby, the fixing force of the bearing currently fixed to the receiving hole of a support body can be heightened.
According to a fourth aspect of the present invention, in the bearing structure for a rotating body according to any one of the first to third aspects, the bearing includes an impact absorbing portion that absorbs an impact from the supporting body or the rotating body. Formed.
Thereby, the bearing structure excellent in impact resistance can be obtained.

According to a fifth aspect of the present invention, in the bearing structure for a rotating body according to the fourth aspect, the shock absorbing portion is a thin portion formed between a plurality of slits formed so as to surround the support hole and adjacent slits. And composed.
Thereby, since it is simple and can obtain the bearing structure excellent in impact resistance with a single member, it is possible to reduce the manufacturing cost.

According to a sixth aspect of the present invention, there is provided the bearing structure for a rotating body according to any one of the first to fifth aspects, wherein the support is a train wheel receiver or a main plate constituting a train wheel mechanism of a wristwatch. The rotating body is a gear that transmits rotational force.
As a result, it is possible to provide a wristwatch that includes a bearing portion having excellent wear resistance and that can be easily assembled by reducing the number of parts, thereby reducing the manufacturing cost.

Furthermore, the invention according to claim 7 is the bearing structure of the rotating body according to any one of claims 1 to 6, wherein the metallic glass alloy is composed of a Zr group, a Co group, an Fe group, and a Ni group. This is a metallic glass alloy.
Thereby, the site | part formed with the metal glass alloy can be made into the site | part which is excellent in abrasion resistance, and has the characteristic of high intensity | strength and low Young's modulus.

Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described in detail with reference to the drawings.
FIG. 1 is a plan view showing a train wheel mechanism of an embodiment of an electronically controlled mechanical wristwatch according to the present invention, and FIGS. 2 and 3 are cross-sectional views showing the main parts of the train wheel mechanism.
The electronically controlled mechanical wristwatch according to the present invention is provided with a gear train mechanism 3 for transmitting the mechanical energy of the mainspring 1A to the generator 2.

The train wheel mechanism 3 includes a barrel wheel 1, a second wheel 5, a third wheel 6, a fourth wheel 7, a fifth wheel 8, a sixth wheel 9, and a rotor 18 of the generator 2.
As shown in FIG. 2, the barrel 1 is composed of a barrel gear 1B that is rotationally driven by a spring 1A that stores mechanical energy, a barrel 1C for winding the spring 1A, and a barrel lid 1D. . The mainspring 1A has an outer end fixed to the barrel gear 1B and an inner end fixed to the barrel complete 1C. The barrel complete 1 </ b> C is rotatably supported between the ground plate 10 and the train wheel bridge 11 that are disposed to face each other. A square hole wheel 12 is fixed to the barrel complete 1C by a square hole screw 13 so that the barrel complete 1C and the square hole wheel 12 rotate integrally. The mainspring 1A can be wound up by the barrel 1C by rotating the square hole wheel 12 clockwise with a crown (not shown). The square wheel 12 is meshed with the corkscrew 14 so as to rotate clockwise but not counterclockwise.

The rotation of the barrel wheel 1B that is driven to rotate by the mainspring 1A is transmitted to the second wheel 5 and then increased in speed to the third wheel 6 and further sequentially increased to the fourth wheel 7, the fifth wheel 8, It is transmitted to the rotor 18 described later of the sixth wheel 9 and the generator 2. Here, a minute hand 16 is fixed to the second wheel 5 via a cylindrical pin 15, and a second hand 17 is fixed to the fourth wheel 7.
The generator 2 includes a rotor 18, a stator 19, a first coil block 20, and a second coil block 21. The rotor 18 includes a rotor magnet 18A, a rotor kana 18B, and a rotor inertia disc 18C that are passed through the rotation shaft. Among these, the rotor inertia disc 18 </ b> C is provided to reduce the rotational speed fluctuation of the rotor 18 with respect to the driving torque fluctuation from the barrel complete 1.

  The stator 19 forms a magnetic circuit of the generator 2 together with the rotor magnet 18 </ b> A of the rotor 18. The stator 19 is provided with magnetic cores 20A, 21A around which the first and second coil blocks 20, 21 are wound. These magnetic cores 20 </ b> A and 21 </ b> A are made of a soft magnetic material having a high magnetic permeability such as PC permalloy and are connected to each other by screws 22. Thus, when the rotor magnet 18A rotates, induced electromotive voltages corresponding to the rotation of the rotor magnet 18A are generated at both ends of the first and second coil blocks 20 and 21, respectively, so that electric energy can be obtained from the generator 2. It has become. The generator 2 having such a configuration also serves as a speed governor that adjusts the rotational speed of the rotor 18 in addition to converting mechanical energy from the mainspring 1A into electric energy. 2 is used to adjust the rotational speed of the rotor 18.

  The second wheel 5, the third wheel 6, the fourth wheel 7, the fifth wheel 8, and the sixth wheel 9 have substantially the same configuration, and each has a rotation shaft and a second kana (cylinder kana). ) 51A, No. 3 Kana 61A, No. 4 Kana 71A, No. 5 Kana 81A, No. 6 Kana 91A are integrally formed with the No. 2 shaft portion 51, the No. 3 shaft portion 61, the No. 4 shaft portion 71, the No. 5 shaft. Portion 81 and sixth shaft portion 91, and disc-shaped second tooth portion 52, third tooth portion 62, and fourth tooth that are integrated with each of shaft portions 51 to 91 and have a diameter larger than each of kana 51A to 91A. A part 72, a fifth tooth part 82, and a sixth tooth part 92 are configured.

  Then, the second pinion 51A of the second wheel 5 is engaged with the barrel wheel 1B of the barrel 1 and the third pinion 61A of the third wheel 6 is engaged with the second tooth portion 52 of the second wheel 5. The fourth tooth 71A of the fourth wheel 7 meshes with the third tooth 62, the fifth tooth 81A of the fifth wheel 8 meshes with the fourth tooth 72 of the fourth wheel 7, and the fifth tooth of the fifth wheel 8. 82 is engaged with the sixth pinion 91A of the sixth wheel 9 and the sixth pinion 92 of the sixth wheel 9 is engaged with the rotor pinion 18B of the rotor 18.

As shown in FIG. 3, the third wheel 6, the fifth wheel 8, the sixth wheel 9 and the rotor 18 are pivotally supported on the train wheel bridge 11 on the back cover side via the bearing 25, and the dial side is the bearing 25. Is pivotally supported on the main plate 10. The second wheel 5 and the fourth wheel 7 are pivotally supported by the train wheel bridge 11 via a bearing 25.
FIG. 4 shows a fifth wheel & pinion 8 pivotally supported on the main plate 10 and the train wheel bridge 11 via a bearing 25.

In the fifth wheel 8, tenons 81 a and 81 b are formed at both ends of the fifth shaft portion 81. One tenon 81 a is rotatably supported by a bearing 25 provided on the train wheel bridge 11, and the other tenon 81 b is A bearing 25 provided on the main plate 10 is rotatably supported.
The upper bearing 25 in FIG. 4 is a part made of a metallic glass alloy, and is integrated into a circular receiving hole 11a formed in a train wheel bridge 11 made of a crystalline metal such as brass, and the lower part of FIG. The bearing 25 is also a part made of a metal glass alloy, and is integrated in a circular receiving hole 10a formed in the base plate 10 made of a crystalline metal such as brass.

  The crystal metal has a discontinuous portion such as a crystal grain boundary which is a boundary between crystal grains and a dislocation which is a positional shift at an atomic level in the crystal grain. On the other hand, the metallic glass alloy is a metal material whose atomic arrangement is random and substantially free of discontinuous parts such as crystal grain boundaries and dislocations, and in this embodiment, specifically, wear resistance. Zr group (eg, Zr—Al—Ni—Cu), Co group (eg, Co—Fe—Si—B—Nb), Fe group (eg, Fe—Co—Ni—Si—B—Nb), Ni A metal glass alloy having a composition such as Ni—Nb—Zr—Ti—Co—Cu or the like is used.

  The inner surface of the receiving hole 11a of the train wheel bridge 11 has a surface shape (corresponding to the undercut surface of the present invention) that is enlarged in a planar shape from the front surface and the back surface of the train wheel bridge 11 toward the center in the thickness direction. The bearing 25 is integrated in contact with the entire inner surface of the receiving hole 11a. A support hole 25a through which the tenon 81a of the fifth wheel & pinion 8 is inserted is formed in the center portion of the bearing 25 in the thickness direction, and a support hole 25a facing the shoulder 81c of the fifth shaft portion 81 is formed. Is formed with a spherical seating surface 25b that is recessed with a predetermined curvature.

  In addition, the inner surface of the receiving hole 10a of the base plate 10 also has a surface shape (corresponding to the undercut surface of the present invention) that expands in a planar shape from the front and back surfaces of the base plate 10 toward the center in the thickness direction. The bearing 25 is integrated in contact with the entire inner surface of the receiving hole 10a. A support hole 25a through which the tenon 81b of the fifth wheel & pinion 8 is inserted is formed through the center portion of the bearing 25 in the thickness direction, and a support hole 25a facing the shoulder 81d of the fifth shaft portion 81 is formed. Is formed with a spherical seating surface 25b that is recessed with a predetermined curvature.

The third wheel 6, the sixth wheel 9 and the rotor 18 are also supported by bearings 25 having the same structure.
According to the bearing structure of the fifth wheel & pinion 8 described above, for example, the hardness of the bearing 25 formed of a metallic glass alloy having a Co base composition is about Hv = 1000, and a crystal metal (Hv = 750) made of hardened steel. Very high compared to. Thereby, since the bearing 25 of this embodiment becomes a member excellent in abrasion resistance like the ruby used conventionally, the tenon 81a, 81b of the fifth wheel 8 is reliably supported over a long period of time. be able to.

  Further, even if an external force in the axial direction (direction in which the support hole 25a extends) acts on the bearing 25 and the bearing 25 tries to move relative to the train wheel bridge 11 and the main plate 10, the inner surface of the receiving hole 11a and the receiving hole 10a. The inner surface of the ring train 11 has a surface shape that gradually increases in diameter from the front surface and the back surface of the train wheel bridge 11 and the base plate 10 toward the center in the thickness direction. Further, since it is reliably prevented from coming out of the receiving hole 10a, the fixing force of the bearing 25 with respect to the train wheel bridge 11 and the main plate 10 can be increased.

Moreover, since the bearing 25 is a member integrated with the inner surface of the receiving hole 11a and the inner surface of the receiving hole 10a, it has a simple structure while reducing the number of components.
The bearing structure of the third wheel 6, the sixth wheel 9, and the rotor 18 can also obtain the same action as the bearing structure of the fifth wheel 8.
Therefore, the train wheel mechanism 3 of this embodiment is excellent in wear resistance and supports the train wheel bridge 11 when the third wheel 6, the fifth wheel 8, the sixth wheel 9, and the rotor 18 are pivotally supported by the bearing structure described above. In addition, since the bearing 25 can be fixed without applying an impact to the receiving holes 11a, 10a provided in the main plate 10, the manufacturing cost can be reduced.

  Here, the shape of the inner surface of the receiving hole 11a of the train wheel bridge 11 corresponding to the undercut surface of the present invention is not limited to the configuration of FIG. 4, and for example, as shown in FIG. 11 is a surface shape that is reduced in diameter in a planar shape from the front surface and the back surface toward the center in the thickness direction, and is convex with a predetermined curvature in a direction close to the axis of the receiving hole 11a, as shown in FIG. A surface shape or a surface shape (not shown) convex with a predetermined curvature in a direction away from the axis of the receiving hole 11a, and a zigzag shape in the direction along the axis of the receiving hole 11a as shown in FIG. It may be a surface shape. And the bearing 25 is formed so that the inner surface whole area of these receiving holes 11a may be contacted. Moreover, the shape of the inner surface of the receiving hole 10a of the ground plane 10 corresponding to the undercut surface of the present invention is the same structure as that shown in FIGS. 5 (a) to 5 (c) so as to be in contact with the entire inner surface of these receiving holes 10a. The bearing 25 may be formed.

Next, FIGS. 6 and 7 show a fifth wheel & pinion 8 pivotally supported by a bearing 27 having impact resistance. Note that the same components as those shown in FIG. 4 are denoted by the same reference numerals and description thereof is omitted.
The bearing 27 of this embodiment is a part made of a metallic glass alloy having a composition of Zr group, Co group, Fe group, Ni group, etc., and as shown in the upper part of FIG. 7, a ring made of a crystalline metal such as brass. It is integrated in a circular receiving hole 11 a formed in the row holder 11. The inner surface of the receiving hole 11a has a surface shape that is enlarged in a planar shape from the front surface and the rear surface of the train wheel receiver 11 toward the center in the thickness direction, and the bearing is in contact with the entire inner surface of the receiving hole 11a. 27 is integrally formed.

  The bearing 27 shown in the lower part of FIG. 7 is also a part made of a metal glass alloy having a composition of Zr group, Co group, Fe group, Ni group, etc., and has a circular shape formed on the ground plate 10 made of a crystalline metal such as brass. It is integrated in the receiving hole 10a. The inner surface of the receiving hole 10a also has a surface shape that is enlarged in a planar shape from the front surface and the back surface of the base plate 10 toward the center in the thickness direction, and the bearing 27 is in contact with the entire inner surface of the receiving hole 10a. It is integrally formed.

  The upper bearing 27 in FIG. 7 has a support hole 27a through which the tenon 81a of the fifth wheel & pinion 8 is inserted in the center part, and around the support hole 27a facing the shoulder 81c of the fifth shaft part 81. A spherical seating surface 27b that is recessed with a predetermined curvature is formed. Further, on the front and back surfaces of the bearing 27, a plurality of arc slits 27c to 27f are formed on a circle having a predetermined diameter so as to communicate with the front and back surfaces, and between adjacent arc slits (for example, arc slits 27c and 27d). A thin portion 27g is formed.

  The lower bearing 27 in FIG. 7 also has a support hole 27a through which the tenon 81b of the fifth wheel 8 is inserted in the center portion, and around the support hole 27a facing the shoulder 81d of the fifth shaft portion 81. A spherical seating surface 27b that is recessed with a predetermined curvature is formed. Further, on the front and back surfaces of the bearing 27, a plurality of arc slits (not shown) are formed on a circle having a predetermined diameter so as to communicate with the front and back surfaces, and a thin portion 27g is formed between adjacent arc slits. ing.

According to the bearing structure of the fifth wheel 8 described above, the bearing 27 made of the metal glass alloy according to the present embodiment is a member having excellent wear resistance like the ruby used conventionally. The tenon 81a, 81b can be reliably supported over a long period of time.
In addition, a metallic glass alloy composed of a Zr group, a Co group, an Fe group, a Ni group, or the like has excellent wear resistance and high strength and low Young's modulus characteristics. In particular, the Young's modulus of a metallic glass alloy composed of Zr group, Co group, Fe group, Ni group, etc. is about 100 GPa, and the Young's modulus is much larger than that of crystalline metal made of steel (Young's modulus is about 200 GPa). Very low.

  Therefore, when an impact is applied in the axial direction of the fifth wheel 8 or in the direction orthogonal to the axis and the tenon 81a moves in the upper axial direction in FIG. 7 or in the direction orthogonal to the axis, the arc slits 27c to 27c of the bearing 27 are moved. The thin portion 27g formed between 27f absorbs an impact while elastically deforming. Further, when the tenon 81b moves in the axial direction below in FIG. 7 or in a direction perpendicular to the axis due to the impact, the thin portion 27g formed between the plurality of arc slits of the bearing 27 absorbs the impact while being elastically deformed.

Thus, the bearing 27 of the present embodiment can be pivotally supported with impact resistance with respect to the fifth wheel & pinion 8.
Further, in the bearing 27 of the present embodiment, the inner surface of the receiving hole 11a and the inner surface of the receiving hole 10a, even if the bearing 27 tries to move relative to the train wheel bridge 11 and the main plate 10, as in the embodiment shown in FIG. Has a surface shape that gradually increases in diameter from the front and back surfaces of the train wheel bridge 11 and the base plate 10 toward the center in the thickness direction, and the bearing 27 is in contact with the entire inner surface so that the bearing 27 receives the receiving holes 11a and the receiving holes. Since it is reliably prevented from coming out of the hole 10a, the fixing force of the bearing 27 to the train wheel bridge 11 and the main plate 10 can be increased.

Further, since the bearing 27 of the present embodiment is a member integrated with the inner surface of the receiving hole 11a and the inner surface of the receiving hole 10a, it requires a plurality of parts, has a complicated structure, and takes time for assembly. Compared with a bearing having the characteristics, the number of components is reduced and the structure becomes simple.
Therefore, if the bearing structure of the third wheel 6, the sixth wheel 9, and the rotor 18 is the same as that of the fifth wheel 8 described above, the manufacturing cost is excellent while being excellent in wear resistance and shock resistance. It is possible to provide the gear train mechanism 3 in which the reduction of the above is achieved.

Next, the manufacture of the bearing 25 shown in FIG. 4 will be described with reference to FIGS.
As shown in FIG. 8, the bearing 25 uses a molding die 30 having a first plate 31, a second plate 32, and a third plate 33 provided so as to be relatively close to each other so that the receiving hole 11 a can be formed. The formed train wheel bridge 11 made of crystalline metal is disposed between the first plate 31 and the second plate 32, and the molding die 30 is filled with a molten material made of a metal glass alloy to form an insert. The train wheel bridge 11 is formed of a crystalline metal made of brass with an increased Cu content.

The first to third plates 31 to 33 are made of, for example, heat-resistant steel or cemented carbide, and the first plate 31 is formed with a spherical convex 31 a that forms the spherical seating surface 25 b of the bearing 25.
A cavity 34 is formed between the first plate 31, the second plate 32, and the receiving hole 11 a by arranging the first and second plates 31 and 32 so as to contact the upper and lower surfaces of the train wheel bridge 11. Has been.

The second plate 32 is formed with a cylindrical projection mold 32 a having the same outer diameter as the inner diameter of the support hole 25 a of the bearing 25. In addition, the second plate 32 has an outlet that opens from the top to the cavity 34, and is continuous with a gate portion 35 formed along the vertical direction and an end portion of the gate portion 35 opposite to the outlet. A runner portion 36 having a larger cross-sectional area than the gate portion 35 is formed. The inner peripheral surface of the gate portion 35 is formed in a cylindrical shape as shown in FIG. 9, and the area of the cross section is formed in a very small cross section of about 7500-75000 μm ² . Further, the inner peripheral surface of the runner portion 36 has a tapered shape that gradually decreases in diameter toward the gate portion 35, and the angle of the taper-shaped inner peripheral surface is set to about 10 to 30 °. Yes.

Further, although not shown, a sprue portion communicating with the runner portion 36 is connected to the third plate 33, and a supply source (not shown) for supplying a molten metal glass alloy is connected to the sprue portion. Yes.
A procedure for manufacturing the bearing 25 using the molding die 30 having the above configuration will be described.
First, the first and second plates 31 and 32 are arranged so that the train wheel bridge 11 is located between them, and the molding die 30 is brought into a closed state. At this time, the spherical convex mold 31a of the first plate 31 is positioned at the center of the receiving hole 11a, and the protruding mold 32a of the second plate 32 is in contact with the spherical convex mold 31a. Then, the inside of the formed cavity 34 is decompressed by decompression means (not shown).

Next, a metal glass alloy having a composition of Zr group, Co group, Fe group, Ni group, etc. is heated to a predetermined temperature to generate a molten metal, and a cavity is formed from a supply source through a sprue part, a runner part 36 and a gate part 35. The molten metal is injected into 34.
The molten metal injected into the cavity 34 is made up of inner walls of the first and second plates 31 and 32 that define the cavity 34 and a ring made of crystalline metal having high thermal conductivity (brass with increased Cu content). It is cooled rapidly by contacting the rail 11. Each atom present in the molten metal randomly solidifies in a state where the random arrangement is preserved. As a result, the molten metal in the cavity 34 becomes a metallic glass alloy in which atoms are randomly arranged, the outer periphery is integrated with the inner peripheral surface of the receiving hole 11a, and the bearing 25 having the support hole 25a and the spherical seating surface 25b is formed. The

  Next, the second plate 32 and the third plate 33 are moved upward with respect to the train wheel bridge 11. At this time, if the second plate 32 is separated from the train wheel bridge 11, the metallic glass alloy existing in the gate portion 35 breaks due to the tensile stress acting on the metallic glass alloy existing in the tapered runner portion 36. The unnecessary portion of the metal glass alloy (the metal glass alloy existing in the gate portion 35) is removed from the bearing 25.

Next, when the first plate 31 is moved downward with respect to the train wheel bridge 11, the train wheel bridge 11 made of crystalline metal and the bearing 25 made of a metal glass alloy are manufactured integrally.
Therefore, according to the manufacturing method described above, the bearing 25 can be easily manufactured.
In addition, since the train receiver 11 is formed of a crystalline metal having high thermal conductivity, the molten metal injected into the cavity 34 comes into contact with the inner surface of the receiving hole 11a, and the cooling rate is increased. A bearing 25 made of an alloy can be formed.

  Furthermore, since the area of the cross section of the gate portion 35 formed on the second plate 32 is extremely small, an unnecessary portion (existing in the gate portion 35) can be obtained simply by separating the second plate 32 from the train wheel bridge 11. Metal glass alloy) can be easily and reliably removed from the bearing 25, and the bearing 25 can be efficiently manufactured by omitting finishing processing such as cutting off unnecessary parts after manufacturing. Reduction can be achieved.

When bearings used in the bearing structure of the bearing 25, the third wheel 6, the sixth wheel 9, and the rotor 18 integrated with the main plate 10 shown in FIG. 4 are manufactured in the same procedure as the bearing 25, Similar effects can be achieved.
Furthermore, manufacture of the bearing 27 shown in FIG.6 and FIG.7 is demonstrated with reference to FIG.
The bearing 27 of the present embodiment uses a forming die 40 having a first plate 41, a second plate 42, and a third plate 43 that are relatively close to each other so that the die can be opened. An insert is formed by placing the train wheel bridge 11 made of metal between the first plate 41 and the second plate 42 and filling the mold 40 with a molten material made of a metal glass alloy.

The train wheel bridge 11 of the present embodiment is also formed of a crystalline metal made of brass with an increased Cu content. The first to third plates 41 to 43 are made of, for example, heat resistant steel or cemented carbide.
The 1st plate 41 is a type | mold arrange | positioned so that it may contact | abut on the upper surface of the train wheel bridge 11, and the some rib type | mold 41a for forming the thin part 27g of the bearing 27 protrudes and is formed below. Moreover, although not shown in figure, the circular arc convex type | mold which forms the some circular arc slits 27c-27f of the bearing 27 protrudes and forms below.

The second plate 42 is a mold that comes into contact with the lower surface of the train wheel bridge 11, and forms a cavity 44 between the first plate 41 and the receiving hole 11a.
The second plate 42 is formed such that a convex mold 42a for forming the spherical seating surface 27b and the support hole 27a of the bearing 27 and a plurality of rib molds 42b for forming the thin portion 27g of the bearing 27 protrude upward. . Further, the second plate 42 has an outlet opening from the bottom to the cavity 44, and is continuous with a gate portion 45 formed along the vertical direction and an end portion of the gate portion 45 opposite to the outlet. A runner portion 46 having a larger cross-sectional area than the gate portion 45 is formed. The inner peripheral surface of the gate portion 45 is a cylindrical shape, the area of the cross section is about ² 7500～75000Myuemu. Further, the inner peripheral surface of the runner portion 46 has a tapered shape that gradually decreases in diameter toward the gate portion 45, and the angle of the taper-shaped inner peripheral surface is set to about 10 to 30 °. Yes.

Further, although not shown, a sprue portion communicating with the runner portion 46 is connected to the third plate 43, and a supply source (not shown) for supplying a molten metal glass alloy is connected to the sprue portion. Yes.
A procedure for manufacturing the bearing 27 using the molding die 40 having the above configuration will be described.
First, the first and second plates 41 and 42 are arranged so that the train wheel bridge 11 is located between them, and the molding die 40 is brought into a closed state. At this time, the convex mold 42 a of the second plate 42 is located in the center of the receiving hole 11 a, and an arc-shaped convex mold (not shown) protruding downward from the first plate 41 is applied to the upper surface of the second plate 42. The rib molds 41a and 42b formed on the first plate 41 and the second plate 42 are arranged so as to face each other. Then, the inside of the formed cavity 44 is decompressed by decompression means (not shown).

Next, a metallic glass alloy having a composition of Zr group, Co group, Fe group, Ni group, etc. is heated to a predetermined temperature to generate a molten metal, and a cavity is formed from a supply source through a sprue part, a runner part 46, and a gate part 45. The molten metal is injected into 44.
The molten metal injected into the cavity 44 is made up of inner walls of the first and second plates 41 and 42 that define the cavity 44, and a ring made of crystalline metal (brass with increased Cu content) having high thermal conductivity. It is cooled rapidly by contacting the rail 11. Each atom present in the molten metal randomly solidifies in a state where the random arrangement is preserved. As a result, the molten metal in the cavity 44 becomes a metallic glass alloy in which atoms are randomly arranged, the outer periphery is integrated with the inner peripheral surface of the receiving hole 11a, and the support hole 27a, the spherical seating surface 27b, the arc slits 27c to 27f, and A bearing 27 having a plurality of thin portions 27g is formed.

  Next, the second plate 42 and the third plate 43 are moved downward with respect to the train wheel bridge 11. At this time, when the second plate 42 is separated from the train wheel bridge 11, the metallic glass alloy existing in the gate portion 45 breaks due to the tensile stress acting on the metallic glass alloy existing in the tapered runner portion 46. The unnecessary portion of the metal glass alloy (the metal glass alloy existing in the gate portion 45) is removed from the bearing 27.

Next, when the first plate 41 is moved upward with respect to the train wheel bridge 11, the train wheel bridge 11 made of crystalline metal and the bearing 27 made of a metal glass alloy are integrally manufactured.
Therefore, according to the manufacturing method described above, the bearing 27 having impact resistance can be easily manufactured.
In addition, since the train receiver 11 is formed of a crystalline metal having high thermal conductivity, the molten metal injected into the cavity 44 comes into contact with the inner surface of the receiving hole 11a and the cooling rate is increased, so that high-quality metallic glass is used. A bearing 27 made of an alloy can be formed.

  Furthermore, since the cross-section of the gate section 45 formed in the second plate 42 is very narrow, the unnecessary portion (existing in the gate section 45 can be obtained by simply separating the second plate 42 from the train wheel bridge 11. Can be easily and reliably removed from the bearing 27, so that it is possible to efficiently produce the bearing 27 by omitting finishing processing such as cutting off unnecessary parts after the production. Reduction can be achieved.

Note that the bearing 27 having an impact resistance used for the bearing structure of the bearing 27, the third wheel 6, the sixth wheel 9, and the rotor 18 integrated with the main plate 10 shown in FIG. When manufactured according to the procedure, the same effect can be obtained.
In addition, in the manufacturing method of the bearing shown in FIG.8 and FIG.10, although demonstrated about the shaping | molding die provided with the 1st plate, the 2nd plate, and the 3rd plate, it is not restricted to the insert shaping | molding die mentioned above, For example, It is also conceivable to form the entire train wheel bridge 11 from a metal glass alloy, or to form the base plate 10 having a bearing from a metal glass alloy. In this way, when the train wheel bridge 11 and the entire main plate 10 are formed of a metal glass alloy, the metal ring alloy 11 and the main plate 10 can be manufactured at a low cost by using a metal glass alloy composed of Fe as a material. it can.

  Furthermore, the bearing structure according to the present invention is not limited to the train wheel mechanism of an electronically controlled mechanical wristwatch, and is applied to, for example, a small mobile phone internal bearing that supports a rotating shaft without using a rolling element such as a bearing. Also good.

It is a top view which shows the gear train mechanism of embodiment of the electronically controlled mechanical wristwatch which concerns on this invention. It is the figure which showed the principal part of the wheel train mechanism in the cross section. It is the figure which showed the principal part of the wheel train mechanism in the direction different from FIG. It is a figure which shows the bearing structure of the fifth wheel which comprises a wheel train mechanism. It is a figure which shows the shape of the inner peripheral surface of a train wheel bridge, and the outer peripheral surface of a bearing. It is the figure which showed the bearing structure provided with the impact resistance of the fifth wheel which comprises a gear train mechanism from the axial direction. It is sectional drawing of the bearing structure provided with impact resistance. It is a figure which shows the metal mold | die which shape | molds the bearing structure shown in FIG. It is an enlarged view of the site | part shown with the code | symbol A of FIG. It is a figure which shows the metal mold | die which shape | molds the bearing structure provided with the impact resistance shown in FIG.6 and FIG.7.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... barrel wheel 1A ... mainspring, 1B ... barrel wheel gear, 1C ... barrel barrel true, 1D ... barrel barrel cover, 2 ... generator, 3 ... wheel train mechanism, 5 ... second wheel, 6 ... third wheel, 7 ... fourth Number wheel, 8 ... Number 5 wheel, 9 ... Number 6 wheel, 10 ... Ground plate (support), 10a ... Receiving hole, 11 ... Train wheel support (support), 11a ... Receiving hole, 18 ... Rotor, 19 ... Stator 25 ... Bearing, 25a ... Support hole, 25b ... Spherical seat surface, 27 ... Bearing, 27a ... Support hole, 27b ... Spherical seat surface, 27c, 27d, 27e, 27f ... Arc slit (slit), 27g ... Thin wall portion, 30 ... Mold, 31 ... First plate (first mold), 31a ... Spherical convex mold, 32 ... Second plate (second mold), 32a ... Projection mold, 33 ... Third plate, 34 ... Cavity, 35 ... Gate portion, 36 ... Runner portion, 40 ... Molding die, 41 ... First plate (first die), 41a, 2b ... Rib mold, 42 ... Second plate (second mold), 42a ... Convex mold, 43 ... Third plate, 44 ... Cavity, 45 ... Gate part, 46 ... Runner part, 51 ... Second shaft part, 51A ... No. 2 pin, 52 ... No. 2 tooth portion, 61 ... No. 3 shaft portion, 61A ... No. 3 pinion, 62 ... No. 3 tooth portion, 71 ... No. 4 shaft portion, 71A ... No. 4 pinion, 72 ... No. 4 tooth 81, fifth shaft, 81a ... tenon (shaft), 81b ... tenon (shaft), 81A ... fifth pin, 82 ... fifth tooth, 91 ... sixth pin, 91A ... sixth pin, 92 ... No. 6 tooth

Claims (7)

In the bearing structure of the rotating body, in which the bearing is fixed inside the receiving hole formed in the support body, the shaft of the rotating body is inserted into the support hole formed in the bearing and the shaft is slidably supported.
A bearing structure for a rotating body, wherein the support is made of crystalline metal, and the bearing is made of a metallic glass alloy. In the bearing structure of the rotating body, in which the bearing is fixed inside the receiving hole formed in the support body, the shaft of the rotating body is inserted into the support hole formed in the bearing and the shaft is slidably supported.
A bearing structure for a rotating body, wherein both the support and the bearing are formed of a metal glass alloy.   3. The rotating body according to claim 1, wherein one of the inner surface of the receiving hole and the outer surface of the bearing is an undercut surface, and the other surface is in surface contact with the undercut surface. Bearing structure.   The bearing structure for a rotating body according to any one of claims 1 to 3, wherein an impact absorbing portion that absorbs an impact from the support body or the rotating body is formed on the bearing.   5. The bearing structure for a rotating body according to claim 4, wherein the shock absorbing portion is composed of a plurality of slits formed so as to surround the support hole and a thin portion formed between the adjacent slits. .   6. The support according to claim 1, wherein the support is a train wheel bridge or a main plate constituting a train wheel mechanism of a wristwatch, and the rotating body is a gear for transmitting a rotational force. 2. A bearing structure for a rotating body according to item 1.   The bearing of a rotating body according to any one of claims 1 to 6, wherein the metallic glass alloy is a metallic glass alloy having a composition of Zr group, Co group, Fe group, and Ni group. Construction.

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