JPH08130850A - Weight for generating vibration and vibration generator equipped with weight - Google Patents

Abstract

PURPOSE: To increase a weight percentage and reduce a production cost without increasing its volume by constituting a weight for generating vibration of a vibration generator built in a beeper or the like with a weight frame and a weight body formed to be attachable to said frame. CONSTITUTION: A weight frame 20 is made of a support plate 21, support cylindrical portion 22 and a support frame 23, and a shaft hole 22a for pressing in a rotating shaft 1 is formed in the support cylindrical portion 22. A weight body 30 has longitudinal grooves 33 extending in up and down directions and the support frame 23 of the weight frame is fitted to this longitudinal groove 33. The weight body 30 is attached to the rotating shaft of a motor through the weight frame 20 and can generate a large vibrating energy by arranging it to an eccentric position relative to the rotating shaft 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generating weight and a vibration generating apparatus equipped with the same, and more particularly to a vibration generating weight used for calling a portable radio such as a pager or a mobile phone. As a structure suitable for.

[0002]

2. Description of the Related Art Conventionally, a vibration generator is built in a portable wireless device, a pager or the like to notify a holder of a call by generating vibration. In this vibration generator, a weight that is eccentrically attached to the rotating shaft is rotated by a motor, and the center of gravity of the weight moves with rotation to generate vibration. In this vibration generator, as shown in FIG.
Then, the bush 2 is press-fitted into the bush 2, the adhesive is applied to the surface of the bush 2, and then the bush 2 is inserted into the shaft hole 32a of the weight 3 and fixed by adhesion. The weight 3 is a sintered body formed of high specific gravity heavy metal, for example, a tungsten alloy containing tungsten as a main component, and is formed of a fan-shaped eccentric portion 31 and a cylindrical portion 32 integrally formed with the eccentric portion 31. A shaft hole 32a is formed at the center of the cylindrical portion 32. In this case, in order to simplify the attaching process of the rotary shaft 1 and the weight 3, the rotary shaft 1 is attached to the shaft hole 32.
Japanese Utility Model Publication No. 4-13860 discloses a method in which the cylindrical portion 32 is directly inserted into a and fixed by caulking the cylindrical portion 32 from the outside.

[0003]

In the above-mentioned vibration generator, it is necessary to generate high-amplitude and high-energy vibration so that the vibration can be transmitted clearly even on clothes, but increase the amplitude and vibration energy. If so, the eccentric weight of the weight, the operating volume, and the volume of the motor become large, and there is a problem that the portability of the device is impaired. Further, the high-specific heavy alloy is expensive, and there is a problem that the manufacturing cost becomes high in an apparatus using a weight having a large eccentric weight. Therefore, the present invention is to solve the above problems, and an object thereof is to realize a new weight structure capable of generating a large vibration without increasing the installation volume and reducing the manufacturing cost. .

[0004]

Means for Solving the Problems The means taken by the present invention to solve the above-mentioned problems are provided for eccentricity with respect to a rotary shaft and for generating vibration by rotating around the rotary shaft. In the weight, a weight body made of a high specific gravity material and a fitting hole for fitting and fixing the rotation shaft are provided, and the weight body is provided at a position eccentric to the axis of the fitting hole. A weight frame having a mounting portion and made of a material having a lower specific gravity than the weight body, and mounting and fixing means for fixing the weight body to the weight frame are provided.

In this case, the mounting and fixing means is
It is preferable that the weight frame includes an engaging arm formed on the weight frame, and an engaged portion formed on the weight body and fixedly engaged with the engaging arm.

Further, it is preferable that the attaching and fixing means is provided with a guide portion which is provided on the weight frame and which abuts on the weight body and regulates its position.

Further, the mounting and fixing means includes a concave portion formed on one of the weight body and the weight frame and extending in the axial direction of the rotary shaft, and a convex portion formed on the other side and extending in the axial direction of the rotary shaft. It is preferable that the convex portion is formed so as to fit into the concave portion.

Further, the mounting and fixing means is composed of a weight accommodating portion formed on the weight frame and having a shape matching the shape of the weight body, and an adhesive for adhering and fixing the weight body to the weight accommodating portion. It is preferable to configure.

Further, a vibration generator is constructed which has each of the above-mentioned vibration generating weights and a motor having the rotary shaft as an output shaft.

[0010]

According to the present invention, since the weight body having a high specific gravity is attached to the weight frame having a low specific gravity and the weight frame is fixed to the rotating shaft,
Since it is not necessary to provide the weight body with a mounting portion for the rotary shaft and an extra portion need not be provided in the weight body, the volume of the expensive weight body can be reduced and the manufacturing cost can be reduced. Also, by providing a weight frame, the eccentric arrangement of the weight body can be freely designed, and since the weight frame with a low specific gravity is responsible for the attachment part to the rotating shaft, a high weight ratio can be achieved without increasing the size of the weight. Obtainable.

According to the second aspect, since the engaged portion of the weight body is engaged with the engaging arm provided on the weight frame, the attachment can be easily performed.

According to the third aspect, the weight body can be easily attached by mounting the weight body along the guide portion provided on the weight frame, and the weight body weight is in contact with the weight body even after the weight body is attached. Since the portion bears, the mounting strength can be increased.

According to the fourth aspect, since the weight body and the weight frame are mounted and fixed by fitting the concave portion and the convex portion, the mounting method and the mounting structure are simplified, and the manufacturing cost is reduced. There is.

According to the fifth aspect, by accommodating and adhering the weight in the weight accommodating portion of the weight frame, the adhering area can be increased and the mounting strength can be increased.

According to the sixth aspect, it is possible to realize a vibration generator which is compact and can generate large vibration energy in spite of low cost.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the vibration generating weight according to the present invention will be described with reference to the drawings. (First Embodiment) As shown in FIG. 1, this embodiment comprises a weight frame 20 made of steel and attached to a rotary shaft 1 of a motor, and a weight body 30 made of a tungsten sintered alloy. The weight frame 20 has a support plate 21 having a planar shape in which two fan shapes having different diameters are joined, a support cylindrical portion 22 formed to project from a small-diameter fan-shaped portion of the support plate 21, and a large diameter support plate 21. A pair of engagement frame portions 2 formed to project from the ends of the fan-shaped portion
3 and 23. Here, a shaft hole 22a extending vertically is formed in the support cylindrical portion 22, and the rotary shaft 1 of the motor is press-fitted therein.

On the other hand, the weight body 30 has a fan-shaped cross-sectional shape that matches the support surface 21a formed on the upper surface of the large-diameter fan-shaped portion of the support plate 21. This weight body 30 is W
-Ni-Fe system, W-Ni-Cu system, W-Mo-Ni-
This is a sintered powder of a super-polymerized gold material having a large specific gravity of about 17 to 18.5 g / cm ³ such as an Fe-based material. On the end face of the weight body 30, a pair of vertical grooves 33 extending in the vertical direction,
33 is formed and the weight body 30 can be fixed to the weight frame 20 by press-fitting the vertical groove 33 into the engagement frame portion 23 of the weight frame 20.

In this embodiment, the weight frame 20 is formed by pressing using a steel material having a relatively small specific gravity and high rigidity. The weight frame 20 can be formed of a single plate material by molding the support cylindrical portion 22 by subjecting it to burring molding. Shaft hole 22a bored in the support cylindrical portion 22
Is determined to be long enough to support the weight of the weight body 30 in a state where the rotary shaft 1 is press-fitted, in consideration of the material of the weight frame 20.

In this embodiment, the weight frame 20 having a low specific gravity is formed, and the weight body 30 having a high specific gravity is attached to the weight frame 20, so that the weight body 30 is fitted to the rotating shaft 1 of the motor. Since it is not necessary to form a portion and a shaft hole and the weight body 30 can be arranged away from the axis of the rotary shaft 1, the weight ratio can be increased without increasing the volume of the high specific heavy alloy, It is possible to generate large vibration energy with a volume and low cost.

(Second Embodiment) Next, a second embodiment according to the present invention will be described with reference to FIG. In this embodiment, a support plate 41 and a support cylindrical portion 42 similar to those of the first embodiment are formed on the weight frame 40, but a pair of support plates 41 projecting upward from the end portion of the support plate 41. The guide frame portions 43, 43 are for positioning the weight body 50 by contacting the end surface of the weight body 50.

A fitting shaft 44 is formed at the center of the support surface 41a so as to project. The fitting shaft 44 is press-fitted into a fitting hole 54 formed at the center of the weight body 50 to fit the weight body 50. It is designed to be fixed. In this embodiment, the fitting hole 54 of the weight body can be introduced into the fitting shaft 44 only by inserting the weight body 50 along the guide frame portion 43.

(Third Embodiment) Next, a third embodiment according to the present invention will be described with reference to FIGS. This example is
As shown in FIG. 3, it comprises a weight frame 60 and a weight body 70.
The weight frame 60 includes a support plate 61 and a support cylindrical portion 62 as in the first embodiment, and the support cylindrical portion 62 is formed with a shaft hole 62a. At the end of the support plate 61, a pair of strips 6
3, 63 are formed so as to project upward. On the other hand, a pair of recesses 73, 73 are formed on the upper surface of the weight body 70.

The bottom surface and the end surface of the weight body 70 are placed in contact with the supporting surface 61a of the weight frame 60 and the strip 63,
By bending the tip 63a of the strip 63 toward the upper surface of the weight body 60, the tip 63a is engaged with the recess 73 as shown in FIG. 4, and the weight body 70 is attached and fixed to the weight frame 60. You can In this embodiment, as the material of the strip 63, the weight body 70 can be supported and the tip portion 63 can be supported.
It is important to adopt a material having mechanical characteristics capable of bending and deforming a.

In this embodiment, the tip portion 63a of the strip 63 is
Since the weight body 70 can be easily attached to the weight frame 60 only by deforming the, the assembling is easy and the shape of the parts is simple, so that the manufacturing cost can be further reduced.

(Fourth Embodiment) Finally, the fourth embodiment of the present invention
An example will be described. As shown in FIG. 5, the weight frame 80 is
The support plates 81 and 82 formed on the upper and lower sides, and the support plates 81 and 8 extending vertically from the arcuate peripheral portion of the support plates.
And a supporting plate 81, 82.
The peripheral plate 83 constitutes a weight accommodating portion for accommodating the weight body 90. Small-diameter fan-shaped shaft support portions 84 and 85 are formed on the support plates 81 and 82, respectively.
Shafts 84a and 85a are formed in the shaft 85, respectively.

In this embodiment, the weight body 90 is accommodated in the weight accommodating portion surrounded by the support plates 81 and 82 and the peripheral plate 83.
At this time, the inner surface of the peripheral plate 83 and the outer peripheral surface of the weight body 90 are bonded together with an adhesive or the like, and then the rotary shaft of the motor is press-fitted into the shaft holes 84a and 85a. In this embodiment, since the inner peripheral surface of the peripheral plate 83 and the outer peripheral surface of the weight body 90, which are the bonding surfaces, have a large area, it is sufficient to form the weight body with a sintered alloy having a weak adhesive force. Adhesive force can be obtained and reliable fixing can be performed.

In each of the above-described embodiments, the weight frame is formed by pressing using a plate-shaped material from the viewpoint of workability and cost reduction, but if sufficient rigidity is obtained, a metal or synthetic resin mold is used. It may be formed by molding. As a method for fixing the weight frame to the rotary shaft, various methods such as bonding with an adhesive, brazing with silver brazing or soldering, caulking, screwing and the like can be adopted in addition to the method by press fitting. The weight frame can be formed of various materials as long as it has a lower specific gravity than the weight body, in consideration of the weight of the weight body, the shape of the rotary shaft mounting portion, the shape of the weight body mounting portion, and the like,
It is preferable that it has a rigidity capable of being sufficiently supported and fixed.

The weight body is not limited to the above-mentioned material and shape, and can be formed in various shapes with various materials as long as it has a higher specific gravity than the weight frame. In this case, in order to obtain a high weight ratio while suppressing the operating volume, it is desirable to form the fan shape as shown in each of the above embodiments. in this case,
The weight body and the weight frame are preferably formed in mutually corresponding shapes, for example, the cross-sectional shape of the weight body and the support surface shape of the weight frame are formed in the same shape, or the inner shape of the weight body is formed of the weight frame. It is preferable to match the shape of the rotary shaft mounting portion (portion in which the fitting hole is formed) in order to downsize the weight without reducing the generated vibration energy.

[0029]

As described above, the present invention has the following effects. According to the first aspect, since the weight body having the high specific gravity is attached to the weight frame having the low specific gravity and the weight frame is fixed to the rotating shaft, it is not necessary to provide the weight body with an attaching portion for the rotating shaft, and the weight body is attached to the rotating body. Since it is not necessary to provide an extra portion, it is possible to reduce the volume of the expensive weight body and reduce the manufacturing cost. Also, by providing a weight frame, the eccentric arrangement of the weight body can be freely designed, and since the weight frame with a low specific gravity is responsible for the attachment part to the rotating shaft, a high weight ratio can be achieved without increasing the size of the weight. Obtainable.

According to the second aspect, since the engaged portion of the weight body is engaged with the engaging arm provided on the weight frame, the attachment can be easily performed.

According to the third aspect, the weight body can be easily attached by mounting the weight body along the guide portion provided on the weight frame, and the weight body is in contact with the weight body even after the weight body is attached. Since the portion bears, the mounting strength can be increased.

According to the fourth aspect, since the weight body and the weight frame are mounted and fixed by fitting the concave portion and the convex portion, the mounting method and the mounting structure are simplified, and the manufacturing cost is reduced. There is.

According to the fifth aspect, by accommodating and adhering the weight in the weight accommodating portion of the weight frame, the adhering area can be increased and the mounting strength can be increased.

According to the sixth aspect, it is possible to realize a vibration generator which is compact and can generate large vibration energy in spite of low cost.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a vibration generating weight according to the present invention.

FIG. 2 is an exploded perspective view showing a second embodiment of the vibration generating weight according to the present invention.

FIG. 3 is an exploded perspective view showing a third embodiment of the vibration generating weight according to the present invention.

FIG. 4 is an enlarged sectional view showing an engaging portion between a weight frame and a weight body according to the third embodiment.

FIG. 5 is an exploded perspective view showing a fourth embodiment of the vibration generating weight according to the present invention.

FIG. 6 is an exploded perspective view showing a structure and a mounting portion of a conventional vibration generating weight.

[Explanation of symbols]

 1 Rotating shaft 20, 40, 60, 80 Weight frame 21, 41, 61, 81, 82 Support plate 22, 42, 62 Support cylindrical portion 22a, 42a, 62a, 84a, 85a Shaft hole 23 Support frame 30, 50, 70 , 90 weight body 33 vertical groove 43 guide frame 54 fitting hole 63 strip 73 recess 83 peripheral plate

Claims (6)

[Claims] 1. A weight for vibration generation, which is eccentrically attached to a rotary shaft and generates vibration by rotation about the rotary shaft, wherein the weight body is made of a high specific gravity material and is fitted to the rotary shaft. A fitting hole for fitting and fixing, and having a mounting portion for the weight body at a position eccentric to the axis of the fitting hole,
A weight for vibration generation, comprising a weight frame made of a material having a lower specific gravity than the weight body, and an attachment fixing means for fixing the weight body to the weight frame. 2. The mounting and fixing means according to claim 1, comprising: an engagement arm formed on the weight frame, and an engaged portion formed on the weight body and engaged and fixed to the engagement arm. A weight for vibration generation that is characterized by: 3. The vibration generating weight according to claim 1, wherein the attaching and fixing means includes a guide portion which is provided on the weight frame and which abuts on the weight body and regulates its position. 4. The mounting / fixing means according to claim 1, wherein the mounting / fixing means is formed in either one of the weight body and the weight frame and extends in the axial direction of the rotating shaft, and the other is formed in the other, and the axis line of the rotating shaft is formed. A vibration generating weight, comprising a convex portion extending in a direction, and being formed by fitting the convex portion into the concave portion. 5. The weight mounting portion according to claim 1, wherein the mounting and fixing means is formed on the weight frame and has a shape conforming to the shape of the weight body, and the weight body is bonded and fixed to the weight storage portion. A weight for vibration generation, which is characterized in that it is composed of an adhesive. 6. A vibration generator comprising the vibration generating weight according to claim 1 and a motor having the rotary shaft as an output shaft.