JPH0630544A - Oscillator in oscillation generator and fixing method thereof - Google Patents

Abstract

PURPOSE:To obtain an oscillation generator having high fixing accuracy at low cost by constituting a rotary shaft securing part of a recessed part for receiving the rotary shaft and a tapered part formed oppositely to the recessed part, and press molding the tapered part in the direction of the rotary shaft while inserting the rotary shaft into the recessed part. CONSTITUTION:An oscillator 2 is made of an allay having high specific gravity abundant in ductility, e.g. a W-Ni-Fe based alloy, and a rotary shaft securing part 3 is formed on the side opposite to the center of gravity. A recessed part 4 for receiving the rotary shaft and a tapered part 5 on the opposite side are molded integrally with the rotary shaft securing part 3. Under a state where the rotary shaft 1 is inserted into the recessed part 4 and the oscillator 2 is placed in a recess of an oscillator mounting base, the rotary shaft securing part 3 of the oscillator 2 is compression molded along the outer periphery of the rotary shaft 1 by means of a mold 21 having inclining part 22 and a mounting base 11. Consequently, the rotary shaft securing part 3 of the oscillator 2 is fixed firmly and efficiently, while being pressed, along the periphery of the rotary shaft 1 of a rotary unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrator in a vibration generator which is mounted on a rotary shaft of a rotary device and which is made of highly malleable and made of a high specific weight heavy alloy, and a method of mounting the vibrator. It is a thing.

[0002]

2. Description of the Related Art FIG. 8 is a diagram for explaining a vibration generator in a conventional example. In FIG. 8, the vibration generator includes a motor 81 having a rotating shaft 82, and the rotating shaft 82.
Eccentric vibrator 8 made of high specific heavy metal attached to
3 and 3. Then, the motor 81 vibrates by rotating the vibrator 83 attached to the rotary shaft 82. The rotation shaft 82 of the motor 81 and the eccentric vibrator 83 are attached to the shaft hole 85 of the vibrator 83.
A bush 84 made of brass, for example, is press-fitted into the. Then, the rotary shaft 82 of the motor 81 is press-fitted into the shaft hole 86 of the bush 84. In addition, the rotary shaft 82 of the motor 81 and the bush 84 are attached with an adhesive or the like, if necessary, to improve the joint strength between them. In addition,
The vibrator 83 is obtained, for example, by molding a high specific heavy metal powder made of tungsten and then sintering it.

FIG. 9 is a view for explaining another fixing method of the rotary shaft and the vibrator of the vibration generator in the conventional example. A method for fixing the rotary shaft and the vibrator of the vibration generator shown in FIG. 9 is disclosed in Japanese Utility Model Publication No. 4-13860 (March 3, 1992).
0 days). In FIG. 9, the rotary shaft 82 of the motor 81 is press-fitted into the shaft hole 85 of the eccentric vibrator 83 made of high specific weight heavy alloy and then crimped by a tool such as a punch (not shown). The crimped portion 87 after crimping is shown in the fixed portion of the vibrator 83 in FIG.

FIGS. 10 (a) to 10 (c) are views for explaining the mounting strength when fixed by caulking. FIG. 10A is a top view of the vibrator 83 attached to the rotary shaft 82. FIG. 10B is a side view of the vibrator 83. FIG. 10C shows B- in FIG.
It is a B'cross section. The rotary shaft 82 is inserted into the shaft hole 88 of the vibrator 83.
After inserting, the force is applied from the direction of arrow 13 by a punch or the like on the side opposite to the center of gravity of the rotary shaft 82. As shown in FIG. 10C, the caulking portion 87 deforms the shaft hole 88 into a shaft hole 88 '. Therefore, the rotating shaft 82 contacts the shaft holes 88 'at two points 90 and 90'. That is, the rotary shaft 82 and the vibrator 83 are fixed by the two points 90 and 90 '.

[0005]

However, in the vibration generator as shown in FIG. 8, the rotating shaft 82 of the motor 81 is inserted after the bush 84 is press-fitted into the shaft hole 85 of the eccentric vibrator 83.
Must be pressed into the shaft hole 86 of the bush 84.
As described above, the attachment of the rotary shaft 82 and the vibrator 83 requires two steps of labor, and thus the productivity is low.

Further, in recent years, the vibration generator has come to be used for calling a pager, time signal of a wristwatch and the like. Since both the pager and the wristwatch are required to be small in size, the vibration generator is also required to be downsized. For example, the vibrator 8 attached to the vibration generator
In No. 3, when the widest portion is 4 mm and the thickness is 4 mm, the diameter of the shaft hole 85 is about 0.7 mm. Such a vibrator 83 has a problem that the shaft hole 85 having the above diameter cannot be obtained when the powder of the tungsten alloy is molded together with the binder in the mold. Therefore,
The vibrator 83 has a shaft hole 8 formed by drilling a hole.
5 was obtained. The rotary shaft 82 and the vibrator 83 are fixed by caulking, but the vibrator 83 may be fragile and cracked. Further, since the rotary shaft 82 and the vibrator 83 are fixed only at two points as shown in FIG. 10C, the fixing strength may deteriorate due to aging.

In order to solve the above problems, the present invention provides a vibrator in a vibration generator having a high mounting strength without the labor for mounting the rotary shaft of the rotating device and the vibrator, and the same. It is intended to provide a mounting method.

[0008]

(First Invention) In order to solve the above problems, a vibrator in a vibration generator according to the present invention has a rotation shaft (see FIGS. 1 to 3 and 6). No. 1), and a vibrator made of highly malleable and highly malleable metal attached to the rotary shaft (1) of the rotary device so as to be eccentric (FIGS. 1 to 3,
And 2) of FIG. 6 in the vibration generating device, the rotary shaft (1) is inserted into the rotary shaft insertion concave portion (4 of FIG. 1) and the opposite side of the rotary shaft insertion concave portion (4). The rotary shaft fixing portion (3 in FIGS. 1 and 6) including the taper portion (5 in FIG. 1).

(Second Invention) The vibrator of the present invention (4 in FIG. 7)
The rotary shaft insertion recess (42 in FIG. 7) into which the rotary shaft (1) in (0) enters is configured to be a U-shaped groove.

(Third Invention) A method of mounting a vibrator in a vibration generator according to the present invention is directed to a mounting table (FIG. 2 and FIG. 2) in which the vibrator (2) has a recess along the outer shape of the vibrator (2). 3) 11), the first step of mounting the rotating device, and a mounting table (11) having a recess along the outer shape of the rotating device.
And a second step of inserting the rotary shaft (1) of the rotating device into the rotary shaft inserting recess (4) formed in the rotary shaft fixing portion (3) of the vibrator (2), Gold having an inclined portion (22, 22 'in FIGS. 4 and 5) for pressing the tapered portion (5) formed on the opposite side of the shaft fixing portion (3) from the rotary shaft insertion recess (4) to the inside. Third step of lowering the mold (21 in FIGS. 4 and 5), and the mounting table (11)
And a mold (21) for compression-molding the rotary shaft fixing portion (3) of the vibrator (2) and the rotary shaft (1) of the rotating device.
It consists of a process and.

(Fourth Invention) According to the method of mounting the vibrator in the vibration generator of the present invention, the mold (26, 27 in FIG. 6) in the third step is pressed from the left and right directions to vibrate the vibrator (2). The rotary shaft fixing part (3) is compression molded.

(Fifth Invention) A method of mounting a vibrator in a vibration generator according to the present invention, wherein the inclined portion (22, 22 ', 28, 28) of the mold (21, 26, 27) in the third step is used.
29), the ridges (24, 30, 31 in FIGS. 5 and 6)
Is molded.

[0013]

[Operation] (First invention) The present applicant has developed a vibrator in a vibration generator and a method of mounting the vibrator in recent years, focusing on the fact that a member having high malleability and high specific ratio heavy metal was developed. That is, the rotary shaft fixing portion of the vibrator used in the vibration generator of the present invention is provided on the side opposite to the center of gravity of the vibrator, and is provided with the rotary shaft insertion concave portion into which the rotary shaft of the rotary device can be inserted from above. There is. Further, the rotary shaft fixing portion of the vibrator has a taper portion formed on the side opposite to the rotary shaft inserting recess. In the rotary shaft fixing portion having the above-described structure, the rotary shaft for rotary insertion is easily inserted into the rotary shaft inserting recess from above. Further, since the rotary shaft of the rotary device and the rotary shaft insertion recess of the vibrator are joined only by compression molding of the entire rotary shaft fixing portion by the mold, no concentrated stress is applied to one place. That is, in the rotating shaft fixing portion having the above structure, the force at the time of mounting is applied from all directions around the rotating shaft, so that the rotating shaft in the rotating device is not eccentric.

(Second Invention) Since the rotary shaft insertion concave portion has a substantially vertical protruding portion on the inner side and an inclined portion is formed on the outer side, the rotary shaft can be inserted more easily than the shaft hole. Since the rotary shaft is inserted into the rotary shaft inserting recess and then compressed and deformed from both sides of the protruding portion, the rotary shaft and the U-shaped groove serving as the rotary shaft inserting recess can contact at three points. Furthermore, since the both projections hold the rotary shaft during the compression deformation, the mounting strength is improved.

(Third Invention) The vibrator is mounted in a recess formed along the outer shape of the vibrator formed on the mounting table. Further, the rotating device is mounted in a recess formed along the outer shape of the rotating device formed on the mounting table. At this time, the rotating shaft of the rotating device is inserted into the rotating shaft inserting recess of the rotating shaft fixing portion formed on the side opposite to the center of gravity of the vibrator. In such a state, the mold having the inclined portion for pressing the tapered portion formed on the side opposite to the rotary shaft inserting recess of the rotary shaft fixing portion inward is lowered. The rotating shaft fixing portion of the vibrator is compression-molded along the outer circumference of the rotating shaft of the rotating device by the mold and the mounting table. Therefore, the rotary shaft of the rotary device and the rotary shaft fixing portion of the vibrator are firmly connected to each other without eccentricity.

(Fourth Invention) The mold for compression-molding the rotary shaft fixing portion of the vibrator is divided into two parts, and the rotary shaft fixing portion of the vibrator is pressed from the left and right directions for compression molding. Even in the case of mounting by such a method, similarly, the mounting strength between the rotary shaft fixing portion and the rotary shaft is improved.

(Fifth Invention) In the mold for compression-molding the rotary shaft fixing portion of the vibrator, since the protrusion is formed on the inclined portion, when the rotary shaft fixing portion of the vibrator is compression molded, A part of it is further strongly pressed in the direction of the rotation axis. Therefore, the rotary shaft fixing portion has a groove formed of a ridge on its surface and is compression-molded to improve the mounting strength with the rotary shaft. The ridges formed in the mold can be oriented vertically or horizontally.

[0018]

EXAMPLE FIG. 1 is a diagram for explaining an example of a vibrator according to the invention. In FIG. 1, the oscillator 2
Is, for example, a semicircular shape, and is a W-Ni-Fe system or W-Ni-
Cu-based, W-Mo-Ni-Fe-based specific gravity of about 18g
/ Cm ^{3 is} a high specific heavy alloy. Then, the vibrator 2 is fired after the powder made of the above materials is molded together with the binder into the illustrated shape. Further, it is known that when the above-mentioned material contains about 90% by weight of tungsten and the remaining about 10% by weight of other materials, brittleness disappears and malleability is high. The vibrator 2 has a rotary shaft fixing portion 3 formed on the side opposite to the center of gravity thereof. Rotating shaft fixing part 3
Is integrally formed with a U-shaped rotary shaft insertion recess 4 into which the rotary shaft 1 is inserted, and a tapered portion 5 having an inclined surface on the opposite side of the rotary shaft insertion recess 4. Note that FIG.
In FIG. 1, the rotating device for rotating the rotary shaft 1 is omitted, but it may be an electric machine such as a motor, or a mechanical device such as a spiral spring.

FIG. 2 shows an embodiment in which the vibrator and the rotating shaft of the rotating device according to the present invention are attached, and shows a state before the rotating shaft fixing portion is pressed by the mold. FIG. 3 is a diagram showing a state in which the vibrator and the rotating shaft of the rotating device according to the present invention are attached, and a state in which the rotating shaft fixing portion is pressed by a mold is shown. FIG. 4 is a perspective view showing an embodiment of a mold according to the present invention. 2 and 3, the mounting table 11 includes a rotating device mounting portion having a recess that is the same as the outer shape of a rotating device (not shown), and a vibrator mounting recess 13 that has the same outer shape as the vibrator 2.
And a vibrator mounting table 12 formed of. Figure 4
In the mold 21, the mold 21 has a tapered portion 5 of the rotary shaft fixing portion 3.
The inclined portions 22 and 22 'are formed so as to press the inward. Then, for example, a part of the mounting table upper part 14 may be projected on the mounting table 11 so as to abut against the mold lower part 23 when the mold is lowered.

The mounting table 11 is attached to, for example, a lower portion of a press machine (not shown), and the mold 21 is also attached to a movable part of the press machine. Also, the oscillator 2
Are mounted in the vibrator mounting recess 13 along the outer shape of the vibrator 2 formed on the mounting table 11. Further, the rotating device is placed in a recess formed along the outer shape of the rotating device formed on the mounting table 11. At this time, the rotary shaft 1 of the rotary device is deeply inserted into the rotary shaft inserting recess 4 of the rotary shaft fixing portion 3 formed on the side opposite to the center of gravity of the vibrator 2. The insertion of the rotary shaft 1 into the rotary shaft insertion recess 4 is simply performed by pushing in from above. In such a state, the mold 21 having the inclined portions 22 and 22 'for pressing the taper portion 5 formed on the opposite side of the rotary shaft fixing portion 3 from the rotary shaft inserting recess 4 inward is lowered. The rotating shaft fixing portion 3 of the vibrator 2 is compression-molded along the outer periphery of the rotating shaft 1 of the rotating device by the mold 21 and the mounting table 11. In the compression molding of the mounting table 11 and the mold 21, the rotary shaft fixing portion 3 of the vibrator 2 is firmly attached while being pressed along the periphery of the rotary shaft 1 of the rotating device.

FIG. 5 is a view showing another embodiment of the mold according to the present invention. 5 is different from the mold shown in FIG. 4 in that the protrusions 24 are formed on the inclined portions 22 and 22 ′ of the mold 21. Such a ridge 24 makes a groove on the surface of the rotary shaft fixing portion 3 when the rotary shaft fixing portion 3 of the vibrator 2 is compression-molded along the periphery of the rotary shaft 1 to form a rotary shaft of the rotating device. The joint between 1 and the rotary shaft fixing portion 3 is made stronger. Further, by making the width of the ridge 24 optional, the attachment strength between the rotary shaft 1 and the vibrator 2 during compression molding can be controlled.

FIG. 6 is a view showing another embodiment of the mold according to the present invention. 6 is different from FIGS. 4 and 5 in that the mold compression-molds the rotary shaft fixing portion 3 from the left and right directions. That is, the mold 26 having the inclined portion 28
The mold 27 having the inclined portion 29 can be moved left and right. And, in the molds 26 and 27,
For example, the protrusions 30 and 31 are formed in the horizontal direction. The ridges 30 and 31 can also be vertical. Also in the molds 26 and 27 as described above, substantially the same effect as that of the above-described embodiment is obtained.

FIGS. 7A to 7C are views for explaining another embodiment for fixing the rotating shaft and the vibrator. That is, FIG. 7A is a top view of the vibrator. Figure 7
(B) is a side view of the vibrator. Figure 7 (c) shows Figure 7.
It is a sectional view of the AA 'portion shown in (a). 7A to 7C, the oscillator 40 is
It is made of a semicircular high-ratio heavy alloy and is attached to the rotary shaft 1 of the motor. Further, the vibrator 40 is formed with ridges 41, 41 'parallel to the position eccentric from the center of gravity thereof, and by these, a U-shaped groove 42 shown in FIG.
Is configured. The vibrator 40 and the rotary shaft 1 are arranged such that after the rotary shaft 1 is placed in the U-shaped groove 42, the ridges 41, 41 'are provided.
It is attached by a deforming portion 43 which is a deformed portion. That is, when the deformed portion 43 of the vibrator 40 is enlarged, as shown in FIG. 7C, the rotary shaft 1 has the ridges 41 and 41 '.
Is deformed to form bulges 44 and 44 '. Further, the rotary shaft 1 includes the bulging portions 44, 44 'and the reference numeral 4.
It can be seen that they are in contact with each other at three points. That is, the U-shaped groove 42 is in contact with the rotary shaft 1 on the three planes thereof and holds the rotary shaft 1 by compression molding.
The compression molding expands the contact area between the rotating shaft 1 and the vibrator 40, and improves the reliability of the mounting strength.

An experimental example comparing the mounting strengths of the oscillator 40 having the U-shaped groove 42 shown in FIG. 7 with the oscillator 83 shown in FIG. 10 and the rotary shaft 82 is shown below. Transducers 40 and 83
Has a width of 4 mm and a thickness of 4 mm, and the diameter of the shaft hole 88 is 0.7 mm. After the rotary shaft 1 is inserted between the protrusions 41 and 41 'provided on the vibrator 40 shown in FIG. 7, the protrusions 41 and 41' are compression-molded as described in the embodiment. The vibrator 83 shown in FIG. 10 has a shaft hole 88 formed in the vibrator 83. Then, after the rotary shaft 82 is press-fitted into the shaft hole 88,
The caulking was done. In this state, the test of pulling out the rotary shaft 1 or 82 from the vibrator 40 or 83 was repeated. The results are shown below. Number Vibrator 40 of the Present Invention Transducer 83 in Conventional Example (Pulling Strength kg) (Pulling Strength kg) 1 11.0 9.0 2 12.0 8.5 3 12.0 8.5 4 11.0 9. 0 5 12.0 8.0 6 12.0 8.5 7 12.0 9.0 8 11.5 8.5 9 11.0 9.0 10 12.0 8.0 Average 11.65 8.6 As described above, the pull-out test of the vibrator 40 and the rotary shaft 1 of the present invention was clearly better than that in the conventional example.

Although the present embodiment has been described in detail above, the present invention is not limited to this embodiment. Various design changes can be made without departing from the present invention described in the claims. For example, although the vibrator of the embodiment has a semicircular shape, it may have a fan shape or another shape as long as it is eccentric. Needless to say, the inclination of the mold is not particularly limited as long as the tapered portion of the rotary shaft fixing portion can be better compression molded along the circumference of the rotary shaft. Furthermore, it is desirable that the press machine that performs compression molding be capable of bottom dead center control by hydraulic pressure or the like. Pressing machines that can control bottom dead center can accurately control the pressure, such as when making pull tops for beer cans and juice cans, so vibrations can be generated during compression molding of the rotary shaft fixing part of the vibrator. The child never breaks. The vibration generator obtained by the present invention is suitable when used for a small radio calling device such as a pager, or for a time signal of a wristwatch.

[0026]

According to the present invention, since the shape of the rotary shaft fixing portion is the rotary shaft inserting concave portion, the rotary shaft of the rotating device is easily inserted, and the rotary shaft has the shaft hole for inserting the thin rotary shaft. Since there is no need to make it, productivity has improved. According to the present invention, since the rotary shaft of the rotating device and the rotary shaft inserting concave portion of the vibrator are compression-molded, the periphery of the rotary shaft is joined by the rotary shaft fixing portion of the vibrator having good malleability. Also,
The compression molding of the rotary shaft by the mold does not cause eccentricity of the rotary shaft because concentrated stress is not applied to a part of the rotary shaft.
According to the present invention, since the rotary shaft and the vibrator are in contact with each other at least at three places, the mounting strength is improved.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an example of a vibrator according to the invention.

FIG. 2 is a diagram showing a state before pressing a rotary shaft fixing portion with a mold in an embodiment in which a vibrator and a rotary shaft of a rotating device according to the present invention are attached.

FIG. 3 is a diagram showing a state in which a rotating shaft fixing portion is pressed by a mold in an embodiment in which a vibrator and a rotating shaft of a rotating device according to the present invention are attached.

FIG. 4 is a perspective view showing an embodiment of a mold according to the present invention.

FIG. 5 is a view showing another embodiment of the mold according to the present invention.

FIG. 6 is a view showing another embodiment of the mold according to the present invention.

7A to 7C are views for explaining another embodiment for fixing the rotary shaft and the vibrator.

FIG. 8 is a diagram for explaining a vibration generator in a conventional example.

FIG. 9 is a diagram for explaining another fixing method of the rotary shaft and the vibrator of the vibration generator in the conventional example.

10A to 10C are views for explaining the attachment strength when fixed by caulking.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotating shaft 23 ... Lower part of mold 2, 40 ... Transducer 24 ... Ridge 3 ... Rotating shaft fixing portion 26, 27 ...
Mold 4 ... Rotating shaft insertion recess 28, 29 ...
Inclined part 5 ... Tapered part 30, 31, 4
1, 41 '... Ridge 11 ... Mounting table 42 ... U-shaped groove 12 ... Transducer mounting table 43 ... Deformation part 13 ... Transducer mounting recess 44, 44'・ ・
-Bulging part 14 ... Mounting table upper part 45 ... Contact part 21 ... Mold 22,22 '... Inclined part

Claims (5)

[Claims] 1. A vibration composed of a rotating device whose rotation is derived from a rotating shaft, and a vibrator made of highly malleable and highly specific heavy metal, which is attached to the rotating shaft of the rotating device so as to be eccentric. The generator includes a rotary shaft inserting recess into which the rotary shaft is inserted, and a rotary shaft fixing portion including a taper portion formed on the opposite side of the rotary shaft inserting recess. . 2. The vibrator in a vibration generator according to claim 1, wherein the rotary shaft insertion recess into which the rotary shaft is inserted is a U-shaped groove. 3. A vibrator in a vibration generator for fixing a vibrator, which is rich in malleability and made of high specific polymerization heavy metal, so as to be eccentric to a rotary shaft of the rotary device, and generates vibration by rotating the rotary device. In the mounting method, a first step of mounting the vibrator on a mounting table having a recess along the outer shape of the vibrator, and mounting a rotating device on the mounting table having a recess along the outer shape of the rotating device. At the same time, a second step of inserting the rotating shaft of the rotating device into the rotating shaft inserting recess formed in the rotating shaft fixing portion of the vibrator, and a taper formed on the opposite side of the rotating shaft fixing recess of the rotating shaft fixing portion. A third step of lowering a die having an inclined portion for pressing the portion inward, and a fourth step of compression-molding the rotating shaft fixing portion of the vibrator and the rotating shaft of the rotating device by the mounting table and the die. And consists of Method of mounting the vibrator in the vibration generating apparatus for. 4. The method of mounting a vibrator in a vibration generator according to claim 3, wherein the mold in the third step is pressed from the left and right directions to compression-mold the rotary shaft fixing portion of the vibrator. . 5. The method of mounting a vibrator in a vibration generator according to claim 3, wherein a protrusion is formed on the inclined portion of the mold in the third step.