JP3017387B2 - Vibration generator for small wireless pager - Google Patents

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 paging device.

[0002]

2. Description of the Related Art In recent years, as a kind of a small paging wireless paging apparatus, a type having a built-in vibration generator has been widely used. In a device incorporating such a vibration generating device, by generating vibration instead of generating a ringing tone, for example, even when crowded or during a meeting, reception is possible without being known to others Can be confirmed. FIGS. 5 and 6 show an example of this type of conventional vibration generator. In these figures, reference numeral 1 denotes a small motor connected to a signal generation circuit of a small wireless device.
A brass bush 3 is press-fitted and fixed to the rotating shaft 2, and a fan-shaped plate-shaped vibrator 4 is bonded and fixed to the outer periphery of the bush 3 in an eccentric state. The vibrator 4 is formed of a metal having a high specific gravity such as a tungsten sintered alloy or an alloy thereof. Here, the reason why the vibrator 4 is not directly bonded to the rotating shaft 2 is because the vibrator 4 and the rotating shaft 2 have poor wettability to an adhesive, and a sufficient bonding strength cannot be obtained. is there. For this reason, in the above-mentioned conventional vibration generating device, the bonding strength is improved by interposing the brass bush 3 which is easily press-fitted and has good wettability to the adhesive.

[0003]

However, in the above-described conventional vibration generator, when the vibrator 4 is fixed to the rotating shaft 2, a step of press-fitting the bush 3 into the rotating shaft 2 and an adhesive to the bush 3 are performed. A step of applying
Since three steps including the step of attaching the vibrator 4 to the rotating shaft 2 are required, there is a problem that productivity is low and manufacturing cost increases.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to effectively solve the above-mentioned conventional problems, and has been developed by using a motor and a powder metallurgy method eccentrically fixed to a rotating shaft of the motor.
Accordingly, a vibrator made of a high-density metal molded is provided, and the vibrator has a mounting hole formed at an eccentric position thereof, and a rotating shaft of the motor is inserted into the mounting hole, At the outer circumference of the rotating shaft, with respect to the plane containing the axis
At a position shifted toward the center of gravity of the vibrator, the vibrator is fixed to the rotating shaft by being caulked at one or more points from the other side in a state where one is in contact with a plane. It is.

[0005]

Further, as the vibrator, W powder;
98% by weight and Ni powder; mixed powder having a composition of 1.0 to 11% by weight or W powder; 89 to 98% by weight
And Ni powder; 1.0 to 11% by weight;
-6% by weight, Fe powder; 0.1-6% by weight, Mo powder;
It is preferable to use a mixed powder having a composition containing 0.1 to 6% by weight and one or two or more kinds of Co powder; 0.1 to 5% by weight;

[0007]

According to the vibration generating apparatus for a small-sized wireless paging device having the above-mentioned structure, the vibrator is fixed by caulking to the rotating shaft of the motor, so that the assembling work is simplified and the influence of dirt on the bonding interface. Both are firmly joined without being subjected to the heat. At this time, in the caulking position of the vibrator, one of the vibrators is caulked by a punch or the like from the other side in a state where one of the vibrators is in contact with a flat surface. When the caulking position is displaced in the axial direction and a rotational moment or shear stress acts on the vibrator or the rotating shaft, there is no danger of causing undesired deformation or residual stress on them.

In addition, since the caulking position is set to a position shifted toward the center of gravity of the vibrator, the inner surface of the mounting hole comes into contact with the rotating shaft on the side opposite to the center of gravity of the vibrator. When the vibrator rotates, there is no gap in the direction of the load acting on the rotating shaft due to the centrifugal force, so that there is no possibility that rattling or the like occurs between the mounting hole and the rotating shaft.

Further, as the vibrator, W-Ni-based, W-Ni-Fe-based, W-Ni-C
If a super-polymerized gold material made of an u-based or W-Mo-Ni-Fe-based alloy or the like is used, a significantly higher malleability can be obtained as compared with other general alloys, and cracking when caulking is performed. There is no danger. Here, the reason for limiting the content of each of the above-described compositions will be described. When the amount of W (tungsten) exceeds 98% by weight, malleability is reduced, and cracks are generated during crimping, which is inappropriate. Conversely 89
If the amount is less than the weight%, a predetermined specific gravity cannot be obtained, which is inconvenient as a vibrator of this kind. 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. Limited to. 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.

[0010]

1 to 3 show an embodiment of a vibration generator for a small-sized radio paging apparatus according to the present invention. The same components as those shown in FIGS. 5 and 6 are denoted by the same reference numerals. The description is omitted here. 1 to 3, reference numeral 10 denotes a vibrator, and the vibrator 10 has a W
-Specific gravity of 17 to 19 g, such as -Ni-based, W-Ni-Fe-based, W-Ni-Cu-based, or W-Mo-Ni-Fe-based
/ Cm ^{3 and} formed by powder metallurgy using a super-polymerized gold material.

This will be described more specifically.
0 is W powder; 89-98% by weight and Ni powder; 1.0
To a mixed powder having a composition of 0.1 to 11% by weight, or W and Ni
6 wt%, Fe powder; 0.1-6 wt%, Mo powder;
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 4} ton / cm ² in the form of a fan plate, and the green compact is subjected to liquid phase sintering in a hydrogen gas stream having a dew point of 0 ° C. to −60 ° C. or in an ammonia decomposition gas. vacuum,
700 in either neutral or reducing atmosphere
After heating in a temperature range of 14C to 1430C, a heat treatment of quenching to at least 300C at a cooling rate of 40C / min or more is performed.

A mounting hole 11 having an inner diameter substantially equal to the outer diameter of the rotating shaft 2 of the motor 1 is formed in the vicinity of the center of the sector of the vibrator 10 thus obtained so as to penetrate in the thickness direction. ing. Then, the oscillator 10, after inserting the rotation shaft 2 into the mounting hole 11, as shown in FIGS. 1 and 2, the outer peripheral portion of the rotary shaft 2, the relative to the plane containing the axis C At a position shifted toward the center of gravity of the vibrator 10 (in this embodiment, as indicated by P in FIG. 2, a position shifted by the distance γ toward the center of gravity of the vibrator 10), one of the jigs 12 is held down.
Is fixed to the rotary shaft 2 by being caulked with a punch or the like at the substantially central portion in the axial direction from the other side in a state of contact with the flat surface 13.

In the vibration generator having the above structure, the vibrator 10 is fixed by caulking to the rotating shaft 2 of the motor 1, so that the assembling work is simplified, and the bush and the adhesive are used. This not only reduces costs but also facilitates application to automatic machines. In addition, at the time of the above-described crimping, the vibrator 10 is plastically deformed such that the inner surface of the mounting hole 11 contacts the surface of the rotating shaft 2 over a half circumference or more as shown by L in FIG. As a result, a large contact area between the vibrator 10 and the rotating shaft 2 is obtained, and as a result, both are firmly joined. At this time, since the joining strength between the vibrator 10 and the rotating shaft 2 is hardly affected by contamination at the joining interface, the frequency of occurrence of joining defects is reduced, and the yield is improved, in combination with the above-mentioned effects. . By the way, in this type of vibration generator, the vibrator 10 with a thickness of 4.63 mm having the above composition has an outer diameter of about 10 kg, whereas the vibrator 10 having the above composition has an outer diameter of about 10 kg. When swaged and fixed to the 0.8mm rotating shaft 2, the pull-out strength is 11.5kg
, High fixing strength was obtained.

In addition, in the caulking position of the vibrator 10, one of the vibrators 10 is caulked by a punch or the like from the other side while one of the abutting portions is in contact with the flat surface 13 of the jig 12. In addition to the above, when the caulking positions from both sides are displaced in the axial direction and a rotational moment or shear stress acts on the vibrator 10 or the rotating shaft 2, there is a possibility that inconvenient deformation or residual stress may occur on these. And a strong fixation can be obtained. Further, since the caulking position is set to a position shifted toward the center of gravity of the vibrator 10, the inner surface of the mounting hole 11 is brought into contact with the rotating shaft 2 on the side opposite to the center of gravity of the vibrator 10. As a result, when the vibrator 10 rotates, there is no gap in the load direction acting on the rotating shaft 2 due to the centrifugal force, so that there is no danger that the mounting hole 11 and the rotating shaft 2 will be loosened. A decrease in durability is prevented.

Further, as the vibrator 10, W-Ni-based, W-Ni-Fe-based, W-Ni-
Since a super-polymerized gold material made of an alloy such as a Cu-based alloy or a W-Mo-Ni-Fe-based alloy is used, a significantly higher malleability can be obtained as compared with other general alloys. There is no risk of cracking.

[0016]

FIG. 4 shows another embodiment of the vibration generating apparatus for a small-sized wireless paging apparatus according to the present invention. In this vibration generating apparatus, a vibrator 10 has a rotating shaft mounted in a mounting hole 11. After inserting the rotary shaft 2, at a position radially shifted toward the center of gravity with respect to the plane including the axis at the outer peripheral portion of the rotary shaft 2,
While one of the jigs 12 is in contact with the flat surface 13 of the jig 12, it is fixed to the rotary shaft 2 by being caulked with a punch or the like at two locations in the axial direction from the other side.

Therefore, in the vibration generator of this embodiment, in addition to the functions and effects shown in FIGS. 1 to 3, the fixing strength of the vibrator 10 can be further increased. It is suitable when applied to a material having a large thickness of 10.

As described in the above embodiment,
In addition, the above-mentioned caulking processing is performed by
And a plane substantially perpendicular to the line connecting
It can be done at a location located on the center of gravity of the
It is the most preferable in terms of use effect.

Further, in the above embodiment, the vibrator 1
Although one side surface of O is brought into contact with the flat surface 13 over the entire surface, the present invention is not limited to this, and at least the position facing the caulking side may be supported by the flat surface.

[0020]

As described above, the vibration generator for a small wireless paging device according to the present invention has a motor and a high ratio formed by a powder metallurgy method eccentrically fixed to the rotating shaft of the motor. A vibrator made of heavy metal, and a mounting hole is formed in the vibrator at an eccentric position, and a rotating shaft of the motor is inserted into the mounting hole, and an outer peripheral portion of the rotating shaft is provided. , The center of gravity of the oscillator with respect to the plane containing the axis
At the position shifted to the side , one is abutted against a plane and swaged at one or more points from the other side, so that it is fixed to the rotating shaft, so that assembly work is simplified and cost is reduced. The vibrator can be firmly attached to the rotating shaft because it can be reduced, there is almost no influence of dirt on the joining interface, and there is no risk of deformation or residual stress on the vibrator or rotating shaft during crimping. Can be fixed.

Further, since the caulking position is set at a position shifted toward the center of gravity of the vibrator, when the vibrator rotates, there is no gap in the load direction acting on the rotating shaft due to the centrifugal force of the vibrator. There is no danger that the backlash or the like will occur between the mounting hole and the rotating shaft, and the durability will be reduced.

Further, as the vibrator, W powder; 89
To 98% by weight and Ni powder; a mixed powder having a composition of 1.0 to 11% by weight, or W powder; 89 to 98% by weight and Ni powder; 1.0 to 11% by weight, Cu;
1 to 6% by weight, Fe powder; 0.1 to 6% by weight, Mo powder; 0.1 to 6% by weight and Co powder; Mixing of a composition containing one or more of 0.1 to 5% by weight. If the powder is formed by powder metallurgy, high malleability can be obtained, and there is no possibility of cracking when caulking.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a vibrator is crimped to a rotating shaft in one embodiment of a vibration generator of a small wireless paging device of the present invention.

FIG. 2 is a front view showing a vibrator and a rotating shaft of FIG. 1;

FIG. 3 is an enlarged front view showing a joining portion between a vibrator and a rotating shaft in FIG. 2;

FIG. 4 is a plan view showing a state where a vibrator is crimped to a rotating shaft in another embodiment of the present invention.

FIG. 5 is a side view showing a conventional vibration generator of a small wireless paging device.

FIG. 6 is a front view showing a conventional vibration generator of a small wireless paging device.

[Explanation of symbols]

 2 rotating shaft 10 vibrator 11 mounting hole 13 plane

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuyuki Ichikawa 46-1 Chifuku, Susono City, Shizuoka Prefecture Inside Higashifuji Manufacturing Co., Ltd. (56) References JP-A-3-146605 (JP, A)

Claims (3)

(57) [Claims] 1. A vibration generator for a small wireless paging apparatus comprising a motor and a vibrator made of a high specific gravity metal formed by a powder metallurgy method and eccentrically fixed to a rotating shaft of the motor. A mounting hole is formed in the eccentric position of the motor, and the rotating shaft of the motor is inserted into the mounting hole, and the outer peripheral portion of the rotating shaft vibrates with respect to a plane including an axis.
A small wireless paging device fixed to the rotary shaft by being caulked at one or more points from the other side in a state where one is in contact with a plane at a position shifted toward the center of gravity of the child. Machine vibration generator. 2. The vibrator is characterized in that a mixed powder having a composition of 89 to 98% by weight of W powder and 1.0 to 11% by weight of Ni powder is formed by powder metallurgy. The vibration generator for a small wireless paging device according to claim 1 . 3. The vibrator according to claim 1, wherein the W powder contains 89 to 98% by weight and the Ni powder contains 1.0 to 11% by weight of Cu;
1 to 6% by weight, Fe powder; 0.1 to 6% by weight, Mo powder; 0.1 to 6% by weight, Co powder; Mixing of composition containing one or more of 0.1 to 5% by weight claim powder, and characterized in that the molded by powder metallurgy 1
The vibration generator for a small-sized wireless paging device according to claim 1.