JPH01266936A - Wheel for clock and its manufacture - Google Patents

Abstract

PURPOSE:To reduce the torque loss of a bearing part by forming it with the bearing part borne by a machine frame and pinion part integrally formed with this bearing part and forming the bearing part and the pinion part by the plastic working of forging or compressing, etc. CONSTITUTION:A flange part 6e is formed by thinning more than the plate thickness of a strip 30 by applying a compression load from the upper and lower faces on one part of the strip 30 and No.5 pinion part 6b, drum part 6f and bearing parts 6c, 6d are formed by raising the thinned material in the vertical direction. A very smooth face is formed by improving the finishing face of a die on the surface of the pinion part, bearing part, etc., and the torque loss is reduced. No.5 wheel 6 is completed by punching a No.5 gear 6a by press shearing from the strip sheet 30 at a stage III. At forging or compressing stage the ejector 21 forming the blind hole 6d borne of the shaft of a ground plate is inserted to a lower die 20. An upper die 23 forms the No.5 pinion gear by electric discharge machining, inserting almost the same shaped ejector 24. The bearing part and pinion part are formed by forging or compressing, so the torque loss is thus less.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a watch wheel and a method of manufacturing a watch wheel.

[Conventional technology]

The structure of a conventional watch wheel and its manufacturing method are disclosed in Japanese Patent Application Laid-open No. 1983
There is one described in Publication No.-55472. This is a manufacturing method in which the shaft has a center hole that serves as a bearing section, a gear section raised from the base is integrally formed with the base, and the center hole is sheared.

[Problem to be solved by the invention]

However, such conventional watch wheels and their manufacturing methods,
For example, the torque possessed by a car such as a wheelie wheel is several orders of magnitude greater than that of the cars forming the front wheel train, so even if the bearing portion is formed by shearing, there is almost no effect of torque loss. In addition, since there is no overlap between the t"1 cars, the guiding length of the bearing part may be short. However, it is used for cars that have a small amount of torque and that constitute a front wheel train where the cars only overlap. However, there were issues such as the fact that it was impossible to do so.

Therefore, in order to solve the problems in the structure and manufacturing method of the conventional timepiece, the present invention has been developed by integrally molding the bearing part and the pivot part by compression processing, thereby forming a front wheel train with less torque loss. The purpose is to improve the quality of errands by improving the M-shaped property by using an ejector provided within the outer diameter of the pinion tooth.

[Failure to solve the problem]

The present invention comprises a bearing part supported on a machine frame and a pinion part formed integrally with the bearing part, and the bearing part and the pinion part are formed by plastic working such as forging or compression working. A watch car.

Furthermore, the method for manufacturing a watch wheel includes a step of integrally performing plastic working such as forging or compression working on a bearing part and a pinion part that are supported on a machine frame.

Furthermore, in the manufacturing method for watch wheels in which the bearing part that is supported on the machine frame and the pinion part are integrally molded by compression processing, the watch wheel, which is a workpiece that stays in the mold, is placed within the outer diameter of the teeth of the pinion part. A method of manufacturing a watch wheel equipped with a protruding ejector.

〔Example〕

Fig. 1 is a sectional view of a fifth wheel, which is a watch wheel, showing an embodiment of the present invention, and Fig. 2 (a, ) shows the bearing and other parts formed by forging or compression processing. A plan view of the process of forming the tooth profile of a gear by press shearing, and FIG.
A cross-sectional view is shown. FIG. 3 is a sectional view showing an embodiment of the bearing method for a watch wheel according to the present invention. FIG. 4 is a simple cross-sectional view of a mold showing an example of a curve in forging or compression processing.

In FIG. 1, 6 is a fifth wheel formed by a process described later. The fifth gear 6 includes a fifth gear 6a that meshes with the rotor on the outer periphery of the collar portion 6e, a fifth pinion 6b, and a body portion 6r.
a bearing part 6d that is supported on the upper and lower gear train bridges and the tabs on the main plate;
6c. Further, a rib 6g is formed on the upper surface of the pinion portion 6b and the lower surface of the body portion 6f. paris 6
g is not necessarily formed, and may occur under two conditions or during mold manufacturing.

In FIG. 2, in step (1), a strip material (a short material is also acceptable) 30 is inserted into the mold, and pilot I/balls 31 and 32, which will serve as reference holes for positioning in the subsequent process, are drilled. Next step ■
By applying shrinkage load to a part of the band 30 (larger area than the gear 6a) from the upper and lower surfaces and making it thinner than the plate thickness of the band 30, the collar 6e is formed and the material of the thinned part is The fifth pinion 6b, body portion 6f, and bearing portions 6 (7, 6d) are formed by bulging most of them in the vertical direction.
A desired shape (shape other than the tooth profile of the #5 gear 6a) is obtained. In this invention, the processing in step (2) is called compression processing. Further, the bearing portion 6d makes it easier to obtain the shape of the difficult-to-fill portion on the second side of the fifth pinion 6b. Furthermore, the surfaces of the fifth pinion 6b, bearing parts 6c, 6d, etc. can be made very smooth by improving the finished surface of the mold, resulting in a watch with extremely low torque loss in the bearing parts and meshing parts. You can make a car. Next, in step (2), the fifth gear 6a is removed from the strip material 30 by press shearing to complete the fifth gear 6. In addition to this method, the fifth gear 6a may be punched into a circular shape and processed by rolling. Materials for the fifth wheel 6 include iron, copper alloy, aluminum, and superplastic aluminum alloy (for example, Cu-7).
7,5, Aj-1,0, Fe-4,5, Nj-6, Mn
-2) A superplastic material such as a superplastic ditanium alloy or a superplastic stainless alloy is used. Further, when the fifth wheel & pinion 6 is entirely upholstered, a copper alloy, aluminum, or a superplastic alloy is used, and it is particularly desirable to use a superplastic material.

In the forged or compressed culm shown in FIG. 2(b), the lower tie 20 has an ejector 21 inserted therein that forms a blank hole 60 that is supported on the shaft of the base plate. North Thais 2
No. 3 has a fifth pinion tooth profile formed by electrical discharge machining or cutting.

An ejector 24 having substantially the same shape is inserted into the tooth shape. A pin 25 is driven into the ejector 24 to form a blind hole 6d that is supported on the shaft of the train wheel bridge. pin 25
is fixed to the ejector 24. Ejector 21.
24 has the role of preventing the workpiece stagnant in the upper or lower die 23.20 from being ejected from the die after forging or compression processing, and also has a large ejection force, so that when the part 6e is pressed, the collar part 6e may be destroyed or deformed, so the strength upper limb should be set to be thick or not protrude within the outer diameter. Furthermore, slight gaps are formed between the ejector 21 and the lower die 20, between the ejector 24 and the die 23, and between the ejector 24 and the die 23. This gap is kana length p1 and torso length, 0
Forging or compression processing in which the sum of 2 is 2.5 times or more than the collar part t has the meaning of improving filling properties. Particularly during forging or compression processing, it also serves as an escape point for air, oil, etc. in the space forming the fifth pinion 6b and body portion 6f.

Since a very large force is applied during such forging or compression processing, cemented carbide is desirable as the material for the mold. Next, in the shearing process, the punch 28 which forms the tooth profile of the fifth gear 6a descends and shears the tooth profile of the fifth gear 6a between it and the two dies, thereby completing the fifth gear 6.

3] In (a,) and (b), 1 is the main plate and 2 is the train wheel bridge. 3 consists of a second gear 3a and a second pinion 3b,
This is the fifth wheel with an overwhelming sliding torque between the second gear 3a and the second pinion 3b. 4 is a fourth wheel body in which a fourth gear 4a, a fourth pinion 4b, and a recessed portion 4c in the center are integrally compression-molded with a metal material, and the center hole and the tooth profile of the fourth gear 4a are removed by press shearing in a subsequent process; This is a fourth wheel consisting of a fourth stem 4d that is pushed into the center hole and fixed. The fifth wheel & pinion 3 is rotatably supported by the bar link portion 1a of the main plate and the solo bread balls (at two locations) of the fourth wheel & pinion 4 stacked thereon. Further, the fourth wheel & pinion 4 is supported by the burring portion 1a via the handle hole 2a of the train wheel bridge 2 and the fifth wheel & pinion 3. The clearance of the fifth wheel 3 and fourth wheel 4 is determined by the main plate 1 and the gear train bridge 2. 5 is the fifth wheel, and the third pinion 5 meshes with the third gear 3a.
The third gear 5a that meshes with the fourth pinion 4b, the body 5e, the bearing 5c, and the upper handle 5d are integrally formed of the same metal.

The fifth wheel 5 has a bearing portion 5c rotatably supported by a hub 1s on the main plate, and an upper handle 5d rotatably supported by a hole in the train wheel bridge 2. In addition, the red parts are the bottom surface of the bearing part 5C, the top surface of the dowel 1s, and the body attaching surface 5g.
is determined by the train wheel bridge 2. An appropriate clearance is ensured so that even if the bottom surface of the third kana 5b is exposed, it does not come into contact with the top surface of the main plate 1. 6 is a fifth wheel, the fifth gear 6a meshes with the pinion of the rotor 8, the fifth gear b meshes with the fourth gear 4a, bearing parts 6c, 6 (1 and body part 6f are integrally formed) .The fifth wheel 5 is a turbo IL whose bearing portion 6c is the main plate.
The bearing part 6d is rotatably supported on the hub 2s of the gear train bearing. Also, the red part is the bottom surface of the bearing part 6c and the dowel 1t.
It is determined by the top surface, the bottom surface of the bearing part 6d, and the bottom surface of the turbo 2s. Furthermore, a gap is ensured so that the train wheel bridge 2 and the main plate 1 do not come into contact even when the upper surface of the fifth pinion 6b and the lower surface of the trunk portion 6f are exposed. Since the distance between the bearing portions of the fifth wheel 5 and the fifth wheel 6 is more than twice that of the distance l - the ephemeral length Q, the distance between the cars can be kept small.

16 is the rear south wheel 16a of the day that meshes with the second pinion, the back wheel of the day that meshes with the hour wheel 17, the back wheel 16b of the day that meshes with the lower handle 16c, the upper handle 16d, and the trunk ]-6e, The manufacturing method is the same as that for the fifth wheel & pinion 6. However, I wonder if it's behind the scenes], 6b is because the watch body becomes thicker by producing a paris (it is difficult to produce a certain amount of paris during processing), so between the forging or compression processing and the shearing process mentioned above. The process of crushing the paris is then added. The crushed gap is thicker than the tooth profile on the entire circumference or a part of the pinion tooth profile, and backlash, top thrust, etc. are set to appropriate values so that the crushed edge part 16f and gear 17 mesh with each other. Also, the same method as 6b may be used for the paring process of the fourth hand 4b, but the paring part 4f should be removed to prevent the second hand from becoming flaky.
and the third gear 5d are separated in cross section so that they do not mesh with each other. Furthermore, set the kana shape so that the fourth wheel & pinion 4 can be incorporated.

Referring to FIG. 4, another embodiment will be described in which the lower die is suspended during the forging or compression process. Since the upper die is the same as that shown in FIG. 2, a description thereof will be omitted. The lower die 40 has a cylindrical portion drilled by electrical discharge machining or the like to form the body portion 6f, and a common hole in the bottom surface into which the ejector 41 forming the lower handle 6h is inserted. Also, to prevent the occurrence of flash between the ejector 41 and the through hole during forging or compression processing,
The volume of the space that forms the handle (handle length) can be adjusted.

The ejector explained in Figs. 2 and 3 may be provided on only one side of the L lower die, and the pin 25 may be moved toward the L direction to form the upper die in the same way as the lower handle in Fig. 4. I would like to add that. In addition, although the forging or compression process of the cruising speed has been explained using a band material, for example, it may be processed by upsetting a blank, which is a bar material cut to a predetermined length, or by forming it to the tooth shape of a gear. It is also possible to reduce the cost of materials. Although the explanation has been made for a clock wheel with gears, it can also be applied to cars without gears. For example, in the shearing process, there is a method in which the diameter is slightly larger than the outer diameter of the pinion, and the pinion is pulled out, or it is processed by upsetting. Furthermore, although the fifth wheel was explained in the embodiment, it can also be applied to other watch wheels.

〔Effect of the invention〕

As described above, according to the present invention, by forming the bearing part and the pinion part by forging or compression processing, the surfaces of the bearing part and the pinion part are made very smooth, thereby reducing torque loss in the bearing part, etc. It can be used for small watch cars with a capacity of 1 to 100 lbs that constitute the front wheel train. or,
Since the distance between the F-shaft bearing part of the mold structure can be made sufficiently long, it is possible to reduce the thickness of a watch with a gear train in which the gears overlap each other. Furthermore, since all watch wheels are completed by plastic working, it has excellent effects such as being able to shorten processing time by a large amount.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a fifth wheel showing one embodiment of the present invention;
Figures (a) and (b) are plan sectional views showing the compression process and shearing process of the fifth wheel shown in Figure 1 and the main parts of the mold. Figure 3 (a
) and (b) are cross-sectional views showing an embodiment of the bearing method for a watch wheel according to the present invention. FIG. 4 is a simple sectional view of a mold showing another embodiment of the compressed culm. 6...Fifth wheel 6a...Fifth gear 6b...Fifth pinion 6c, 6d...Bearing portion 20...Lower die 21 ．24... Ejector 23... ・From the upper die Applicant Seiko Epson Co., Ltd. Agent Patent attorney Kizobe Meiki (1 other person) 1 12
- 6ii Ki Figure 1

Claims (3)

[Claims] (1) Consists of a bearing part that is supported on the machine frame and a pinion part formed integrally with the bearing part, and the bearing part and the pinion part are formed by plastic working such as forging or compression working. A watch car characterized by: (2) A method for manufacturing a watch wheel, which includes the step of integrally performing plastic working such as forging or compression working on a bearing part and a pinion part that are supported on a machine frame. (3) In a method of manufacturing a watch wheel in which the bearing part supported on the machine frame and the pinion part are integrally molded by compression processing, the watch wheel is a workpiece that remains in the mold within the outer diameter of the tooth of the pinion part. A method for manufacturing a watch car, characterized in that it is provided with an ejector that protrudes.