JPH07336749A - Vibrator for vibration generator of small radio call device - Google Patents

Abstract

PURPOSE:To provide a vibrator for a vibration generator of a small radio call device capable of fixing the vibrator to a drive shaft of a motor with a high tightening torque without causing a crack and obtaining various effects such as configuration can be made small in size and light in weight as a whole while securing a desired vibration magnitude. CONSTITUTION:This vibrator for the vibration generator of the small-sized calling device is fixed to a drive shaft of a motor with eccentricity. In this vibrator, a rotary shaft insert section 12 to which a mount hole 11 is formed through which the drive shaft of the motor is inserted and an eccentric weight section 13 projecting outward from an axial line of mount hole 11 from an outer circumference of the rotary shaft insert section 12 are formed of different materials.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrator mounted on a vibration generator of a small wireless calling machine.

[0002]

2. Description of the Related Art In recent years, as a type of a paging type small-sized wireless interrogator, a type having a built-in vibration generator in which a vibrator made of a metal of high specific gravity is eccentrically fixed is becoming popular as a rotary shaft of a motor. In a device having such a built-in vibration generator, the vibration is generated by the vibrator instead of making a ringing sound, thereby making it known to others even when crowded or during a meeting, for example. There is an advantage that the reception can be confirmed without being blocked.

2 and 3 show an example of a conventional vibration generator to which a vibrator of this type is attached.
In these drawings, reference numeral 1 in the drawings denotes a small motor connected to a signal generation circuit of a small radio, and a rotary shaft 2 of the motor 1 has a substantially fan shape as a whole, and has a predetermined axial direction. The vibrator 3 having the thickness dimension is inserted into the mounting hole 4 formed in the eccentric position, and the rotary shaft 2 is inserted therethrough.
It is fixed to the rotating shaft 2 by being crimped at a point P on the outer peripheral portion. Here, the oscillator 3 has a W
Powder, Ni powder, Cu powder, Fe powder, etc., are appropriately mixed and then formed into the desired fan-shaped plate by the powder metallurgy method (dry press molding method). It will be.

According to the vibrator 3, the vibrator 3 is mounted on the rotary shaft 2 of the motor 1 only by crimping the vibrator 3. Therefore, the structure is simple and the mounting and the parts management are easy. Is obtained.

[0005]

However, in the above-mentioned conventional vibrator 3, since the whole is made of the same tungsten and tungsten (W) alloy having a high specific gravity, an attempt is made to obtain a larger amount of vibration. Then, the diameter of the fan-shaped eccentric load portion must be naturally increased, and as a result, there is a problem in that the entire size is increased and the weight is increased. In addition, since the W alloy forming the vibrator 3 has a limited toughness, there is a drawback that cracks are likely to occur when the caulking force becomes excessive during caulking.

The present invention has been made to effectively solve the problems of the above-described conventional vibrator for a vibration generator.
It is possible to fix the rotating shaft of the motor with a high crimping force without causing cracks, and it is possible to obtain various effects such as making it possible to reduce the size and weight of the whole while securing a desired amount of vibration. An object of the present invention is to provide a vibrator for a vibration generator of a small wireless calling machine.

[0007]

According to a first aspect of the present invention, there is provided a vibrator for a vibration generator of a small wireless calling machine,
The entire rotary shaft insertion portion forming the outer peripheral portion of the mounting hole into which the rotary shaft of the motor is inserted and the outer periphery of the rotary shaft insertion portion projecting outward from the rotation axis so that the mounting hole is in an eccentric position. The eccentric load portion is formed of materials different from each other.

By the way, the vibrator for a vibration generator according to a second aspect is characterized in that the eccentric load portion according to the first aspect is formed of a material having a larger specific gravity than that of the rotary shaft insertion portion. It is what

According to a third aspect of the present invention, there is provided a vibrator for a vibration generator, wherein the entire rotary shaft insertion portion of the first aspect is:
It is characterized by being formed of a material having a higher toughness than the eccentric load portion.

[0010]

According to the vibrator for a vibration generator of a small-sized wireless interrogator as set forth in claim 1, the entire rotary shaft insertion portion forming the outer peripheral portion of the mounting hole into which the rotary shaft of the motor is inserted,
Since the eccentric load part projecting from the outer periphery of the rotary shaft insertion part to the outside of the rotary axis is made of different materials, the rotary shaft insertion part and the eccentric load part are required for each part. However, it can be formed of an optimum material selected according to different conditions.

That is, if the eccentric load part is made of a material having a larger specific gravity than the rotary shaft insertion part, as in the vibrator for a vibration generator according to the second aspect, the position of the center of gravity of the vibrator is conventionally determined. Since it can be biased toward the outer peripheral side as compared with the one described above, the distance between the center of gravity and the rotation axis becomes large, and thus a large amount of vibration can be obtained when rotating this. In other words, with the miniaturization of the motor, even when the maximum radius of the vibrator is reduced,
Since sufficient vibration can be obtained, it is possible to easily reduce the size or thickness of the entire vibration generator.

Further, as in the vibrator for a vibration generator according to a third aspect of the invention, if the entire rotary shaft insertion portion is made of a material having a higher toughness than the eccentric load portion, the vibrator can rotate the motor. When fixing to the shaft by caulking, it can be fixed with a larger caulking force than the conventional one.
As a result, it becomes possible to obtain a higher drawing strength.

[0013]

[Embodiment 1] FIG. 1 shows an embodiment of a vibrator for a vibration generator of a small wireless calling machine according to the present invention. Figure 1
In the vibration generator vibrator 10, the entire rotary shaft insertion portion 12 constituting the outer peripheral portion of the mounting hole 11 into which the rotary shaft of the motor described above is inserted, and the rotary shaft insertion portion 12 are provided.
And an eccentric load portion 13 projecting outward in a fan shape from the outer periphery of the mounting hole 11 with respect to the axis of the mounting hole 11 are made of different materials. That is, the eccentric load portion 13
Is, for example, W-3.5Ni-1.5Fe (subscript indicates% by weight) having a specific gravity of about 18 and an elongation of 20.
It is formed of a tungsten (W) alloy that is up to 25%. On the other hand, the rotary shaft insertion portion 12 is formed of a material having a specific gravity of 7.6 and a specific gravity smaller than that of the tungsten alloy forming the eccentric load portion 13 such as Fe-2Ni having an elongation of 15 to 20%. Has been done.

By the way, the vibrator 10 for the vibration generator described above.
After molding the member forming the rotary shaft insertion portion 12 and the member forming the eccentric load portion 13 by a press molding method so-called two-layer molding or an injection molding method by insert molding, It is sintered and integrally joined by a binder layer which is leached from the tungsten alloy forming the eccentric load portion 13 at the time of the sintering to the joint interface.

In the vibrator 10 for the vibration generator thus obtained, the rotation shaft of the motor of the vibration generator is attached to the mounting hole 1.
1 and is fixed to the above motor by being crimped at one location on the outer peripheral portion or at a plurality of locations in the axial direction, and is used as a vibration generator.

According to the vibrator 10 for a vibration generator, since the eccentric load portion 13 is made of a material having a larger specific gravity than the rotary shaft insertion portion 12, the vibrator 1
The position of the center of gravity of 0 can be biased toward the outer peripheral side as compared with the conventional one. As a result, the distance between the center of gravity and the rotation axis of the mounting hole 11 can be increased, so that when the vibrator 10 is rotated, a larger vibration amount can be obtained even if the vibrator 10 has the same size as the conventional one. Can be obtained. In other words, in order to secure a desired amount of vibration, the maximum outer diameter dimension of the vibrator 10 can be made smaller than that of the conventional one. As a result, sufficient vibration can be obtained even when the motor is downsized and the maximum radius of the vibrator is further reduced. Therefore, it is possible to easily downsize or thin the entire vibration generator. Is possible.

[0017]

[Embodiment 2] In the following description of the embodiment, since the configuration is the same as that shown in FIG. 1, the same reference numerals are given and the description thereof is omitted. In the present embodiment, the eccentric load portion 13 is formed of, for example, a tungsten (W) alloy having a specific gravity of 16.6 such as W-10Cu-4Ni and an elongation of 2 to 3%. On the other hand, the rotary shaft insertion portion 12 has at least higher toughness than the tungsten alloy forming the eccentric load portion 13, such as Fe-2Ni alloy having a specific gravity of 7.3 and an elongation of 8 to 10%. It is made of material.

According to the vibrator 10 for the vibration generator in the second embodiment, since the entire rotary shaft insertion portion 12 is made of a material having higher toughness than the eccentric load portion 13, the vibrator 10 is used. When it is fixed to the rotating shaft of the motor by crimping, it can be fixed by a larger crimping force than the conventional one. Therefore, the vibrator 10 can be fixed to the rotating shaft of the motor with a higher pulling strength.

[0019]

[Embodiment 3] In this embodiment, the eccentric load portion 13 is used.
However, for example, a W-Ni-Cu alloy such as W-3Ni-2Cu (subscript indicates% by weight) or W-1.5Ni-1
It is formed of a tungsten (W) alloy having a specific gravity of 15 or more and an elongation of 2 to 3%, such as a W-Ni-Cu-Fe alloy such as Cu-0.5Fe (same).
On the other hand, the rotary shaft insertion portion 12 has a specific gravity of 7.4 and an elongation of about 15%, an Fe-Ni alloy, or a specific gravity of 7.
It is made of a material having a specific gravity smaller than that of the tungsten alloy forming the eccentric load portion 13 and a high toughness, such as a stainless steel alloy having an elongation of about 30%.

Therefore, in the third embodiment, the rotary shaft insertion portion 12 is made of a material having a smaller specific gravity and a higher toughness than the tungsten alloy forming the eccentric load portion 13. Therefore, it is possible to obtain the operational effects of both of the first and second embodiments.

[0021]

As described above, the vibrator for a vibration generator of a compact wireless interrogator according to the present invention includes the entire rotary shaft insertion portion that constitutes the outer peripheral portion of the mounting hole into which the rotary shaft of the motor is inserted. Since the eccentric load part protruding from the outer periphery of the rotary shaft insertion part to the outside of the rotary axis is formed of different materials, for example, the eccentric load part is made of a material having a larger specific gravity than the rotary shaft insertion part. If it is formed by, the position of the center of gravity of the vibrator is biased to the outer peripheral side as compared with the conventional one, and the distance between the center of gravity and the rotation axis is increased, so that a larger vibration amount can be obtained during rotation. , The maximum radius of the vibrator can be further reduced to reduce the size or thickness of the motor, and the entire rotary shaft insertion portion is formed of a material having higher toughness than the eccentric load portion. For example, when fixing the vibrator to the rotary shaft of the motor by crimping, it can be fixed with a larger crimping force than the conventional one, so that even higher pulling strength can be obtained. It is possible to obtain various effects.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a vibrator for a vibration generator of a compact wireless interrogator according to the present invention.

FIG. 2 is a side sectional view showing a state in which a conventional vibrator is attached to a motor.

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

[Explanation of symbols]

 1 Motor 2 Motor Rotating Shaft 10 Transducer 11 Mounting Hole 12 Rotating Shaft Insertion Section 13 Eccentric Load Section

Claims (3)

[Claims] 1. A vibrator for a vibration generator of a small wireless interrogator, which is eccentrically fixed to a rotary shaft of a motor, wherein the rotary shaft insertion portion constitutes an outer peripheral portion of a mounting hole into which the rotary shaft of the motor is inserted. And the eccentric load portion projecting from the outer circumference of the rotary shaft insertion portion to the outside of the axis of the mounting hole so that the mounting hole is located at an eccentric position are formed of different materials. A vibrator for a vibration generator of a small wireless calling device. 2. The vibrator for a vibration generator of a small radio caller according to claim 1, wherein the eccentric load part is made of a material having a larger specific gravity than the rotary shaft insertion part. 3. The vibration generator for a small wireless calling machine according to claim 1, wherein the rotary shaft insertion portion is entirely formed of a material having higher toughness than the eccentric load portion. Oscillator.