JPH07184248A - Vibration generator for small-sized radio calling set - Google Patents

Abstract

PURPOSE:To obtain the vibration generator for the small-sized radio calling set in which the assembling is simplified and no residual stress or the like losing durability to a vibrator and a rotary shaft is caused with excellent strength of the vibrator. CONSTITUTION:This vibration generator is constituted motor and a vibrator 10 made of a high specific gravity metal eccentrically fixed to a drive shaft 2 of the motor, a mount hole is formed to the vibrator 10 at its eccentric position, the drive shaft 2 of the motor is inserted to the mount hole and fixed to the drive shaft 2 by being tightened front one point 14 and two points 15, 16 having the position 14 inbetween in a direction of an axial line C from the other side at a position deviated radially with respect to a plane including the axial line C at an outer circumferential part of the drive shaft 2.

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 calling machine.

[0002]

2. Description of the Related Art In recent years, as a kind of paging type small-sized wireless caller, a type having a built-in vibration generator is becoming popular. A device with such a built-in vibration generator generates vibration instead of making a ringing sound, so that it can be received without being noticed by others, for example, even in a crowd of people or during a meeting. There is an advantage that can be confirmed. 4 and 5 show an example of a conventional vibration generator of this type. In these drawings, reference numeral 1 in the drawings 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 vibrator 4 is eccentrically bonded and fixed to the outer circumference of the bush 3. The vibrator 4 is formed of a metal having a high specific gravity such as a tungsten sintered alloy or the alloy thereof. Here, the reason why the vibrator 4 is not directly adhered to the rotary shaft 2 is that the vibrator 4 and the rotary shaft 2 have poor wettability with an adhesive and sufficient adhesive strength cannot be obtained. is there. Therefore, in the above-described conventional vibration generator, the joining strength is improved by interposing the brass bush 3 which can be easily press-fitted and fixed and has good wettability with the adhesive.

[0003]

However, in the above-described conventional vibration generator, when fixing the vibrator 4 to the rotary shaft 2, a step of press-fitting the bush 3 onto the rotary shaft 2 and an adhesive to the bush 3 are used. The step of applying
Since three steps of attaching the vibrator 4 to the rotary shaft 2 are required, there is a problem that productivity is low and manufacturing cost is high.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to effectively solve the problems of the above-mentioned conventional vibration generator, and it is a motor and a high specific gravity metal eccentrically fixed to the rotating shaft of the motor. And a mounting hole is formed at an eccentric position thereof, the rotary shaft of the motor is inserted into the mounting hole, and at the outer peripheral portion of the rotary shaft, It is fixed to the rotary shaft by crimping at one position from at least one side and from the other side at two positions sandwiching the above position in the axial direction at a position displaced in the radial direction with respect to the plane including the axis line. It is characterized by.

It is more preferable that the crimping position is a position displaced toward the center of gravity of the vibrator with respect to the plane including the axis.

As the vibrator, W powder: 89-
98 wt% and Ni powder; 1.0 to 11 wt% mixed powder or W powder; 89 to 98 wt%
And Ni powder; 1.0 to 11% by weight, Cu; 0.1
~ 6 wt%, Fe powder; 0.1-6 wt%, Mo powder;
It is preferable to use a mixed powder having a composition containing 0.1 to 6% by weight and Co powder; 0.1 to 5% by weight, one kind or two or more kinds, which is molded by a powder metallurgy method.

[0007]

According to the vibration generator of the compact wireless interrogator having the above-described structure, the vibrator is fixed to the rotating shaft of the motor by crimping, so that the assembling work is simplified and the influence of dirt on the bonding interface is affected. The two are firmly joined together without receiving any damage. At this time, the vibrator is fixed to the rotary shaft by caulking with a punch or the like at at least one position from one side and from the other side at two positions sandwiching the position in the axial direction. Are crimped alternately from the one side or the other side along the axial direction of (1), so that a high pull-out strength can be obtained.

In addition, if the caulking position is set at a position deviated to the center of gravity of the vibrator, the inner surface of the mounting hole comes into contact with the rotary shaft on the side opposite to the center of gravity of the vibrator. When rotating, there is no gap in the direction of the load acting on the rotating shaft due to the centrifugal force, and there is no risk of rattling between the mounting hole and the rotating shaft.

Further, as the vibrator, W-Ni type, W-Ni-Fe type, and W-Ni-C having the above-mentioned composition are used.
By using a super-polymerized gold material made of a u-based alloy or a W-Mo-Ni-Fe-based alloy, it is possible to obtain markedly higher malleability than other general alloys, and cracks can be formed when caulking. There is no danger of it occurring. Here, the reason why the content of each composition is limited will be described. When the amount of W (tungsten) exceeds 98% by weight, malleability decreases, cracking occurs during caulking, which is unsuitable. On the contrary, 89
This is because if it is less than wt%, a predetermined specific gravity cannot be obtained, which is inconvenient for this type of vibrator. Further, if the amount of Ni (nickel) exceeds 11% by weight, similarly, a predetermined specific gravity cannot be obtained. On the other hand, if it is less than 1.0% by weight, the sinterability will not proceed. Limited to. Further, Co (cobalt) has the same effect as Ni, but if it is less than 0.1% by weight, the effect of sufficient addition cannot be obtained, while if it exceeds 5% by weight, a corresponding effect cannot be obtained. It is uneconomical in manufacturing. Moreover, Cu powder and Fe powder are
By including these, the sintering temperature can be lowered, but if the content is not less than the above upper limit, a predetermined specific gravity cannot be obtained, so the content is limited to the above range.

[0010]

1 to 3 show an embodiment of a vibration generator for a small-sized wireless interrogator according to the present invention. The same components as those shown in FIGS. 4 and 5 are designated by the same reference numerals. The description is omitted. 1 to 3, reference numeral 10 in the drawings denotes a vibrator, and the vibrator 10 is a W
-Ni-based, W-Ni-Fe-based, W-Ni-Cu-based, W-Mo-Ni-Fe-based, etc. with a specific gravity of 17 to 19 g
It is formed by a powder metallurgy method using a super-polymerized gold material of about / cm ³ .

To explain this concretely, the vibrator 1
0 is W powder; 89 to 98% by weight and Ni powder; 1.0
˜11 wt% of the mixed powder, or W powder and Ni powder in the above wt% range with Cu;
6% by weight, Fe powder; 0.1 to 6% by weight, Mo powder;
1 to 6% by weight and Co powder; 0.1 to 5% by weight of mixed powder having a composition containing one or more of 1 ton
/ Cm ^{2 to 4} ton / cm ² is pressed into a fan plate shape, and the green compact is subjected to liquid phase sintering in a hydrogen stream having a dew point of 0 ° C. to −60 ° C. or in an ammonia decomposition gas, and then, vacuum,
700 in either neutral or reducing atmosphere
After being heated in the temperature range of ℃ to 1430 ± 30 ℃, it is heat-treated to be rapidly cooled to at least 300 ℃ at a cooling rate of 40 ℃ / min or more.

A mounting hole 11 having an inner diameter substantially equal to the outer diameter of the rotary shaft 2 of the motor 1 is formed in the thickness direction in the vicinity of the central portion of the fan-shaped vibrator 10 thus obtained. ing. Then, after the rotary shaft 2 is inserted into the mounting hole 11, the vibrator 10 has a diameter of the outer peripheral portion of the rotary shaft 2 with respect to a plane including the axis C, as shown in FIGS. 1 and 2. A position displaced in the direction (in this embodiment, P in FIG.
(At a position deviated by the distance γ toward the center of gravity of the vibrator 10), one location 14 from one side and two locations 1 sandwiching the location 14 from the other side in the axis C direction.
It is fixed to the rotary shaft 2 by being crimped at 5 and 16 by a punch or the like.

In the vibration generator having the above structure, the vibrator 10 is fixed to the rotary shaft 2 of the motor 1 by crimping, so that the assembling work is simplified and the bush and the adhesive are used. In combination with not doing so, the cost can be reduced and the application to an automatic machine becomes easy. Further, at the time of the above-described caulking, the vibrator 10 is plastically deformed so that the inner surface of the mounting hole 11 is in contact with the surface of the rotary shaft 2 over the half circumference or more as shown by L in FIG. As a result, a large contact area between the vibrator 10 and the rotary shaft 2 can be obtained, and as a result, the both are firmly joined. At this time, since the bonding strength between the vibrator 10 and the rotary shaft 2 is hardly affected by the dirt on the bonding interface, the frequency of defective bonding is reduced and the yield is improved in combination with the above effect. . In addition, the vibrator 10 is fixed to the rotating shaft 2 by crimping at one location 14 from one side and at two locations 15 and 16 sandwiching the location 14 from the other side in the axial direction by punching or the like. The vibrator 10 is crimped alternately from the one side or the other side along the direction of the axis C of the rotating shaft 2, so that a high pull-out strength can be obtained. By the way, in the vibration generator of this type, about 10 kg is sufficient as the pull-out strength of the vibrator, whereas the vibrators 10 having a thickness of 4.63 mm and having the above composition are 1.7 mm apart from each other. Separated locations 15, 16
Further, when they were crimped from the center 14 on the opposite side and fixed to the rotating shaft 2 having an outer diameter of 0.8 mm, the pull-out strength was 11.8 kg, and extremely high fixing strength could be obtained.

Further, since the caulking position is set at a position shifted to the center of gravity of the vibrator 10, the inner surface of the mounting hole 11 can be brought into contact with the rotary 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 direction of the load acting on the rotary shaft 2 due to the centrifugal force, so that there is a risk of rattling between the mounting hole 11 and the rotary shaft 2. Therefore, durability does not decrease over a long period of time.

Further, as the vibrator 10, the W-Ni type, the W-Ni-Fe type, and the W-Ni-type having the above-mentioned composition are used.
Since a super-polymerized gold material made of Cu-based or W-Mo-Ni-Fe-based alloy is used, it is possible to obtain markedly higher malleability than other general alloys. There is no risk of cracking.

In each of the above embodiments, the crimping process is performed on a plane substantially orthogonal to the line connecting the rotating shaft 2 and the center of gravity of the vibrator 10, and the vibrator 1 is more than the shaft center of the rotating shaft 2.
An example in which the position is located on the side of the center of gravity of 0 has been described, but the present invention is not limited to this and the position may be shifted to the side opposite to the center of gravity.

Further, in the above embodiment, the vibrator 10
One location 14 on one side and two locations 15, 16 on the other side
However, the invention is not limited to this. For example, in addition to the location 14 on the one side, the location 15 on the other side is sandwiched therebetween, and further another location is used for a total of four locations. Good.

[0018]

As described above, the vibration generator for a compact wireless interrogator of the present invention comprises a motor and a vibrator made of a metal of high specific gravity and eccentrically fixed to the rotary shaft of the motor. , And a mounting hole is formed at the eccentric position of the vibrator, and the rotation shaft of the motor is inserted into the mounting hole, and at the outer peripheral portion of the rotation shaft in the radial direction with respect to the plane including the axis. Since it is fixed to the rotary shaft by crimping at one position from at least one position and at two positions sandwiching the above position from the other in the axial direction at the displaced position, the assembly work is simplified and the cost is reduced. The vibration can be reduced, and the vibrator can be firmly fixed to the rotary shaft with a high degree of detachment without being substantially affected by dirt on the bonding interface.

Further, if the caulking position is set to a position deviated to the center of gravity of the vibrator, when the vibrator rotates, there is no gap in the load direction acting on the rotary shaft due to the centrifugal force of the vibrator. There is no risk of rattling between the rotating shaft and the rotating shaft and lowering the durability.

Further, as the vibrator, W powder: 89
.About.98 wt.% And Ni powder; 1.0 to 11 wt.% Mixed powder, or W powder; 89 to 98 wt.% And Ni powder; 1.0 to 11 wt.%, Cu;
1-6 wt%, Fe powder; 0.1-6 wt%, Mo powder; 0.1-6 wt% and Co powder; 0.1-5 wt% If the powder obtained by molding by the powder metallurgy method is used, high malleability can be obtained, and there is no risk of cracking during crimping.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which a vibrator is crimped to a rotary shaft in an embodiment of a vibration generator for a compact wireless interrogator according to the present invention.

FIG. 2 is a front view showing a vibrator and a rotary shaft of FIG.

FIG. 3 is an enlarged front view showing a joint portion between the vibrator of FIG. 2 and a rotary shaft.

FIG. 4 is a side view showing a vibration generator of a conventional small-sized wireless interrogator.

FIG. 5 is a front view showing a vibration generator of a conventional small-sized wireless calling machine.

[Explanation of symbols]

 2 rotary shaft 10 oscillator 11 mounting hole 13 plane 14, 15, 16 crimping point

Claims (4)

[Claims] 1. A vibration generator for a small wireless interrogator comprising a motor and a vibrator made of a metal of high specific gravity, which is eccentrically fixed to a rotating shaft of the motor, wherein the vibrator is provided at an eccentric position thereof. A mounting hole is formed, and the rotary shaft of the motor is inserted into the mounting hole. At the outer peripheral portion of the rotary shaft, at a position radially displaced from the plane including the axis, at least one position is provided. A vibration generator for a small wireless interrogator, characterized in that it is fixed to the rotary shaft by being crimped at two locations sandwiching the location in the axial direction from the other side. 2. The vibration generator for a small wireless calling machine according to claim 1, wherein the crimping position is a position displaced toward a center of gravity of the vibrator with respect to a plane including the axis. . 3. The vibrator is formed by powder metallurgy molding a mixed powder having a composition of W powder: 89 to 98% by weight and Ni powder: 1.0 to 11% by weight. The vibration generator for a compact wireless interrogator according to claim 1 or 2. 4. The vibrator comprises: 89% to 98% by weight of W powder; 1.0% to 11% by weight of Ni powder;
1-6 wt%, Fe powder; 0.1-6 wt%, Mo powder; 0.1-6 wt%, Co powder; 0.1-5 wt% The powder is formed by a powder metallurgy method.
Alternatively, the vibration generator of the small wireless calling machine according to the item 2.