JPH10322969A - Vibration generator of small-sized radio apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the vibration generator of a small-sized radio apparatus which can be integrally formed with a rotary shaft with a sufficiently large drawing force, without causing breakage in the boss, even in the case where a vibrator is made in a small diameter, and in which this additional fastening work can be performed extremely easily. SOLUTION: This is vibration generator, where a vibrator is mounted integrally by additional fastening to a rotary shaft 2 of a motor, and here a vibrator 4 is composed of a boss 42 which has a mounting hole 51 to fit the rotary shaft 2 and an eccentric load 43 made in a body with this boss 42. Furthermore, the rotary shaft 2 and the vibrator 4 are integrally formed with each other by the periphery on both sides of the section, which catches the rotary shaft 2 of a mounting hole 41 in the boss 42 which is additionally fastened toward the side of the eccentric load 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generator for a small wireless device used for calling a small wireless device such as a portable telephone.

[0002]

2. Description of the Related Art In recent years, as a kind of a small paging-type wireless paging apparatus, a type in which a vibration generating device in which a vibrator made of a metal having a high specific gravity is eccentrically fixed to a rotating shaft of a motor is becoming widespread. In a device incorporating such a vibration generating device, vibration is generated by the vibrator instead of generating a ringing sound, so that, for example, even when crowded or during a meeting, it is known to others. There is an advantage that reception can be confirmed without being received.
FIG. 5 and FIG. 6 show a conventional vibration generating device for a small radio device of this type. The vibration generating device includes a small motor 1 connected to a signal generation circuit of the small radio device, And a vibrator 4 fixed to the rotating shaft 2 via a bush 3 made of brass.

The vibrator 4 is made of a metal having a high specific gravity formed by a powder metallurgy method, and has a load eccentric to the bush 3. Since the rotating shaft 2 and the vibrator 4 have poor adhesive wettability, and therefore, the rotating shaft 2 and the vibrator 4 cannot be directly connected with the adhesive, the bush 3 made of brass is first used. After being fixed to the rotary shaft 2 by press-fitting, the vibrator 4 having good wettability with the adhesive is fixed to the bush 3 with a sufficient adhesive force. Then, the vibrator 4 having an eccentric load vibrates by being rotationally driven by the motor 1, and this vibration allows a wearer to know reception by the small wireless device.

However, in the above-mentioned conventional vibration generator, the rotary shaft 2 and the vibrator 4 must be connected via the bush 3, so that the number of parts is large and the number of manufacturing steps is large, which is uneconomical. There was a problem. When the vibrator 4 is reduced in diameter due to a demand for downsizing of the vibration generator, the outer diameter of the rotating shaft 2 is reduced
The diameter of the vibrator 4 becomes relatively large due to the sum of the thickness of the vibrator 4 and the thickness of the vibrator 4. As a result, the position of the center of gravity of the vibrator 4 approaches the rotating shaft 2 side, and the amount of generated vibration decreases. There was a problem.

Therefore, as shown in FIGS. 7 and 8, a structure in which the vibrator 4 is directly fixed to the rotating shaft 2 by caulking is being adopted. The vibrator 4 has a cylindrical boss portion 4 having a mounting hole 41 fitted to the rotating shaft 2.
2 and an eccentric load portion 43 formed integrally with the boss portion 42. The boss portion 42 is swaged toward the rotating shaft 2 by a vertical load P1 or a vertical load is applied. The vibrator 4 is directly fixed to the rotating shaft 2 by caulking toward the rotating shaft 2 by a lateral load P2 orthogonal to P1.

[0006]

However, in the vibration generating apparatus of the small radio device shown in FIGS. 7 and 8, when the boss portion 42 is crimped by the vertical load P1 or the horizontal load P2, the boss portion 42 becomes plastic in the circumferential direction. Due to the deformation, there is a problem that a gap between the mounting hole 41 and the rotating shaft 2 becomes large in a portion other than the caulked portion. Also, after caulking, the mounting hole 41 may move in a direction away from the rotary shaft 2 due to a slight spring back. For this reason, there is a problem that a large pulling force cannot be obtained with respect to the integration of the rotating shaft 2 and the vibrator 4.

On the other hand, in accordance with the demand for further miniaturization in recent years, the maximum diameter (radius) of the vibrator 4 has been reduced to about 5 mm.
From about 3 mm to about 3 mm.
There is a need to reduce the diameter of the metal to 1 mm or less.
In such a case, if the thickness of the vibrator 4 around the rotating shaft 2 is reduced in order to secure a desired amount of vibration, that is, the amount of eccentricity in the vibrator 4, the vibrator 4 is a powder molded product and has toughness. In addition, the surface pressure acting on the mounting hole 41 from the rotating shaft 2 at the time of crimping becomes high, and the crimping forms a concave portion, and the concave portion becomes extremely thin. There is a problem that the thin boss portion 42 is extremely easily cracked against the vertical load P1 and the horizontal load P2 toward the shaft 2. Also, in particular,
When caulking by the lateral load P2, the boss 42
Is required to be held by a jig or the like from the side opposite to the load P2, but the outer peripheral portion for holding the boss portion 42 has become narrower with downsizing, and thus there is a problem that the caulking operation itself becomes extremely difficult. Was.

SUMMARY OF THE INVENTION The present invention has been made to effectively solve the problems of the above-described conventional vibration generating device for a small wireless device. Even when the vibrator is reduced in diameter, the boss portion is not cracked. It is an object of the present invention to provide a vibration generator for a small wireless device that can be integrated with a rotating shaft with a sufficiently large pulling force and that can perform the caulking operation extremely easily.

[0009]

According to a first aspect of the present invention, there is provided a vibration generating apparatus for a small-sized radio device according to the present invention, wherein the vibrator is integrally attached to a rotating shaft of a motor by caulking. The vibrator is constituted by a boss having a mounting hole to be fitted to the rotating shaft, and an eccentric load portion formed integrally with the boss, and the rotating shaft and the vibrator are provided with a boss. The outer peripheral portions of both sides of the mounting hole, which sandwich the rotation shaft, are integrated by caulking toward the eccentric load portion side. Here, the invention described in claim 2 is characterized in that the mounting hole is formed with a groove in a direction intersecting the crimping direction.

According to the first or second aspect of the present invention, the vibrator is formed by caulking outer peripheral portions of both sides of the mounting hole of the boss portion of the vibrator which sandwich the rotation shaft therebetween toward the eccentric load portion side. Since the rotating shaft is integrated with the rotating shaft, both sides of the rotating shaft are plastically deformed in a concave shape by the above-described crimping, so that the rotating shaft is pressed from both sides in the mounting hole. It can be integrated with a large force. In addition, since the above-described crimping is not performed toward the rotating shaft, but is performed toward the eccentric load portion side, a large plastic deformation allowance can be obtained, and thus even when caulking with a large caulking force. In addition, it is possible to prevent the boss from cracking. As a result,
Since the boss portion can be made thinner, the center of gravity of the entire vibrator can be located on the outer peripheral side of the eccentric load portion, so that a sufficient amount of vibration can be secured.

According to the second aspect of the present invention, since the groove is formed in the mounting hole in a direction intersecting the crimping direction, the outer portion of the groove in the boss portion is plastically deformed by the pressing force. Easier to do. Therefore, the occurrence of cracks can be more reliably prevented, and the rotating shaft and the vibrator can be integrated with a higher pulling force by a smaller pressing force.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a vibration generator for a small paging apparatus according to the present invention. (Embodiment 1) FIGS. 1 and 2 show a first embodiment of the present invention. Elements common to those of the conventional example shown in FIGS. 7 and 8 are denoted by the same reference numerals. , The description of which will be simplified. The vibration generator of this small wireless device connects the rotating shaft 2 and the vibrator 4 with the mounting holes 41 in the boss portion 42.
The outer peripheral portions on both sides sandwiching the rotating shaft 2 are eccentric load portions 43.
It is integrated by caulking toward the side.

The eccentric load portion 43 has two radial side surfaces 431 extending radially outward from the cylindrical boss portion 42 and a circle formed coaxially with the center line C of the mounting hole 41. And an arcuate outer surface 432. The two radial side surfaces 431 are formed so as to be located on a plane passing through the center line C of the mounting hole 41, and the boss portion 42
One of the cylinders after the equal division protrudes from the radial side surface 431. Note that the top of the boss portion 42 is cut out in a planar shape, and the arc-shaped outer surface 432 is further cut out.
Has one shape of a bisected circle having two radial side surfaces 431 as diameters. By the way, the mounting hole 4
1, the radius R1 is 0.3 to 0.4 mm, the outer radius R2 of the boss portion 42 is 0.8 to 1.0 mm, and the radius R3 of the eccentric load portion 43 is 2 to 3 mm. Also, the vibrator 4
Is formed to have a certain thickness dimension in the front and back direction of the paper surface of FIG.

Further, the vibrator 4 is made of W-Ni, WN
i-Fe system, W-Ni-Cu system, or W-Mo-N
It is formed by powder metallurgy using a super-polymerized gold material having a specific gravity of about 17 to 19 g / cm ³ , such as an i-Fe system. Specifically, the vibrator 4 is made of W powder;
Weight% and Ni powder; mixed powder having a composition of 1.0 to 11 weight%, or W powder and Ni powder in the above weight% range, Cu; 0.1 to 6 weight%, Fe powder;
0.1 to 6% by weight, Mo powder; 0.1 to 6% by weight and Co powder; 0.1 to 5% by weight of a mixed powder having a composition containing one or more of 1 ton / cm ² to 4ton
/ Cm ² at a temperature of 0 ° C.
After liquid phase sintering in a hydrogen gas stream with a dew point of 60 ° C. or in an ammonia decomposition gas, 700 ° C. to 1430 ° C. ± in a vacuum, neutral or reducing atmosphere.
After heating in a temperature range of 30 ° C, at least 300 ° C
Up to a cooling rate of 40 ° C./min or more.

The reason why the content of each composition is limited as described above is that, when the amount of W (tungsten) exceeds 98% by weight, the malleability decreases, and cracks occur during crimping, which is unsuitable. On the other hand, if the content is less than 89% by weight, a predetermined specific gravity cannot be obtained, which is inconvenient as a vibrator of this type. Also, when the amount of Ni (nickel) exceeds 11% by weight, a predetermined specific gravity cannot be obtained, and when the amount is less than 1.0% by weight, sinterability does not progress.
Further, Co (cobalt) has the same effect as Ni, but if it is less than 0.1% by weight, a sufficient effect of addition cannot be obtained, and if it exceeds 5% by weight, a corresponding effect cannot be obtained. It is uneconomical in manufacturing. Further, Cu powder and Fe powder are
Although the sintering temperature can be lowered by including these, the specific gravity cannot be obtained when the sintering temperature is higher than the above upper limit value. Therefore, the sintering temperature is limited to the above range.

The caulking jig 5 is provided with projections 5a, 5a at the left and right ends of the tip. These projections 5a, 5a allow the outer peripheral portions on both the left and right sides of the mounting hole 41 to be eccentrically loaded. When pressed toward 43, concave plastic deformation is caused on the outer peripheral portion of the boss portion 42. Each projection 5a presses the center of the boss 42 in the thickness direction. When the boss portion 42 is pressed by the caulking jig 5, as shown in FIG. 1, the jig 6 having the concave portion 61 matching the arc-shaped outer surface 432 of the eccentric load portion 43 causes the eccentric load portion 43. Is to be held.

In the vibration generating apparatus for a small wireless device configured as described above, the outer peripheral portions on both the left and right sides of the mounting hole 41 in the boss portion 42 are pressed by the caulking jig 5 toward the eccentric load portion 42. Up to a predetermined elastic limit, the boss portion 42 elastically bends and the mounting hole 41 presses the rotating shaft 2. Further, when a force P3 exceeding the elastic limit of the boss portion 42 is applied, the left and right outer peripheral portions of the boss portion 42 are plastically deformed in a concave shape. After the plastic deformation, the pressing force P
Even if 3 is removed, the elastic limit force before the plastic deformation remains as residual stress. That is, springback hardly occurs. Therefore, for example, the upper peripheral surface of the mounting hole 41 on the side on which the pressing force P3 acts and the lower peripheral surface on the opposite side of the mounting hole 41 press the rotating shaft 2 by the force due to the residual stress. Become. That is, the entire peripheral surface of the mounting hole 41 presses the rotating shaft 2 with an extremely large force. Further, the flesh portion that has moved into the boss portion 42 due to the plastic deformation in the concave shape presses the rotating shaft 2 from the boundary between the upper peripheral surface and the lower peripheral surface of the mounting hole 41. Therefore, the rotating shaft 2 and the vibrator 4 can be connected with an extremely large force.

By the way, in the vibrator 4 having the above dimensions, if the pulling force is 5 kg or more, the vibrator 4 has sufficient performance for practical use.
A pull-out force of 8 to 10 Kg was obtained. Also, the mounting hole 4
Since the entire circumference of the shaft 1 presses the rotating shaft 2, even if the rotating shaft 2 becomes thin, a large surface pressure does not act locally on the mounting hole 41 from the rotating shaft 2. Therefore,
Cracking of the boss portion 42 can be prevented, and the boss portion 42 can be formed thin. Further, since the pressing force acts on the eccentric load portion 43 side from the boss portion 42, only the eccentric load portion 43 is held by the jig 6,
Plastic deformation can be caused on the outer peripheral portion of the boss portion 42. Therefore, the rotating shaft 2 and the vibrator 4 can be connected very easily.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIGS. In addition,
Elements common to those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The difference between the second embodiment and the first embodiment is that a groove 41a is formed in the mounting hole 41. That is, the mounting hole 4
1 includes grooves 4 in a direction perpendicular to the direction of the force P3 for pressing the outer peripheral portion of the boss portion 42 toward the eccentric load portion 43.
1a is formed. Each groove 41a extends from the inner surface of the mounting hole 41 to a position depending on the inside of each projection 5a of the caulking jig 5. That is, the force P is applied from the inside of each projection 5a.
Each groove 41a extends to the position of the line extending in parallel with the groove 41a.

In the vibration generating apparatus for a small wireless device having the above-described configuration, the groove 41a is formed in a direction orthogonal to the direction of the force P3 for pressing the outer peripheral portion of the boss portion 42 of the mounting hole 41 toward the eccentric load portion 43. This groove 41a is formed
Therefore, the portion of the boss portion 42 outside the groove 41a is easily plastically deformed by the force P. Therefore, a smaller force P3
Thus, the rotating shaft 2 and the vibrator 4 can be connected, and the occurrence of cracks can be more reliably prevented.

In the first and second embodiments, the center of the boss portion 42 in the thickness direction is connected to each of the projections 5.
a, but it is not limited to this, and a plurality of portions in the thickness direction are formed by the protrusions 5a.
May be configured to be pressed. Further, the entire boss portion 42 in the thickness direction may be configured to be pressed by each protrusion 5a.

[0022]

As described above, claim 1 or claim 2
According to the invention described in (1), both sides of the rotating shaft are plastically deformed in a concave shape by the above-mentioned crimping, so that the rotating shaft is pressed from both sides in the mounting hole. It is possible to obtain a large plastic deformation allowance because the caulking is performed toward the eccentric load part side without performing the caulking toward the rotating shaft, and thus a large caulking force can be obtained. Even when swaged, it is possible to prevent the boss from cracking. As a result, since the boss portion can be made thinner, the position of the center of gravity of the entire vibrator can be located on the outer peripheral side of the eccentric load portion, so that a sufficient amount of vibration can be secured. become.

In particular, according to the second aspect of the present invention,
Due to the groove formed in the mounting hole, the outer portion of the groove in the boss portion is easily plastically deformed by the above pressing force, so that it is possible to more reliably prevent the occurrence of cracks, and to reduce the rotating shaft by a smaller pressing force. And the vibrator can be integrated with a high pulling force.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a crimped state of a vibrator according to a first embodiment of the present invention.

FIG. 2 is a front view showing the shape of the vibrator.

FIG. 3 is a longitudinal sectional view showing a crimped state of a vibrator according to a second embodiment of the present invention.

FIG. 4 is a plan view showing the shape of the vibrator.

FIG. 5 is a side view of a vibration generator shown as a conventional example.

FIG. 6 is a front view of the vibration generator.

FIG. 7 is a side view of a vibration generator shown as another conventional example.

FIG. 8 is a front view of the vibration generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Rotating shaft 4 Transducer 41 Mounting hole 41a Groove 42 Boss 43 Eccentric load part 5 Caulking jig C Center line P3 Caulking force

Claims (2)

[Claims] 1. A vibration generating device comprising a vibrator integrally attached to a rotating shaft of a motor by caulking, wherein the vibrator has a boss portion having a mounting hole fitted to the rotating shaft, An eccentric load portion formed integrally with the boss portion, and the rotating shaft and the vibrator,
A vibration generator for a small wireless device, wherein outer peripheral portions of both sides of the mounting hole of the boss portion sandwiching the rotation shaft are crimped toward an eccentric load portion side to be integrated. 2. The vibration generator according to claim 1, wherein a groove is formed in the mounting hole in a direction intersecting with the caulking direction.