JPH07184247A - Vibration generator for small wireless caller - Google Patents

Abstract

(57) [Abstract] [Purpose] Vibration of a small wireless calling machine that simplifies the assembly operation, and does not cause residual stress that impairs durability of the vibrator or rotating shaft, and is excellent in fixing strength of the vibrator. Get the generator. A motor and a vibrator 10 made of high specific gravity metal eccentrically fixed to a rotary shaft 2 of the motor are provided, and the vibrator 10 has a mounting hole 11 formed at its eccentric position. The rotation shaft 2 of the motor is inserted into the mounting hole 11, and at the outer peripheral portion of the rotation shaft 2 at a position displaced in the radial direction with respect to the plane including the axis line, the other is contacted with the plane 13. It is characterized in that it is fixed to the rotary shaft 2 by being crimped at one or more points from the side.

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. 5 and 6 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 in order to effectively solve the above-mentioned conventional problems, and is a vibrator made of a metal of high specific gravity and eccentrically fixed to a motor and a rotation shaft of the motor. And a mounting hole is formed at the eccentric position of the vibrator, the rotary shaft of the motor is inserted into the mounting hole, and at the outer peripheral portion of the rotary shaft,
At a position displaced in the radial direction with respect to the plane including the axis,
It is characterized in that it is fixed to the rotary shaft by crimping at one or more points from the other side in a state where one is in contact with a flat surface.

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, at the crimping position of the vibrator, one side is brought into contact with the flat surface, and the other side is crimped with a punch or the like, so that stable crimping can be performed, and There is no risk of causing inconvenient deformation or residual stress to these when the caulking position shifts in the axial direction and a rotational moment or shear stress acts on the vibrator and the rotary shaft.

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. 5 and 6 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 displaced by the distance γ toward the center of gravity of the vibrator 10), one of them is brought into contact with the flat surface 13 of the jig 12, and the punch or the like is provided at the substantially central portion in the axial direction from the other side. It is fixed to the rotary shaft 2 by being caulked by.

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. . By the way, in this type of vibration generator, about 10 kg is sufficient as the pull-out strength of the vibrator, whereas the vibrator 10 having a thickness of 4.63 mm and having the above-mentioned composition has When it is crimped and fixed to the 0.8 mm rotating shaft 2, its pull-out strength is 11.5 kg.
And high fixing strength was obtained.

In addition, at the crimping position of the vibrator 10, one side is pressed against the flat surface 13 of the jig 12 and the other side is crimped by a punch or the like, so that stable crimping is performed. In addition, 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 rotary shaft 2, which may cause deformation or residual stress that is inconvenient for use. It is possible to obtain a firm fixing without Furthermore, since the caulking position is set to a position shifted to the center of gravity of the vibrator 10, the inner surface of the mounting hole 11 is 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 there is no risk of rattling between the mounting hole 11 and the rotary shaft 2, and so on. The deterioration of durability is prevented.

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 composed of Cu-based or W-Mo-Ni-Fe-based alloys is used, it is possible to obtain markedly higher malleability than other general alloys, and when crimping. There is no risk of cracking.

[0016]

[Other Embodiments] FIG. 4 shows another embodiment of the vibration generator for a small-sized wireless interrogator according to the present invention. In this vibration generator, the vibrator 10 has a rotating shaft inside the mounting hole 11. After inserting 2, at the outer peripheral portion of the rotary shaft 2, at a position displaced radially toward the center of gravity with respect to the plane including the axis,
In a state where one side is brought into contact with the flat surface 13 of the jig 12, it is fixed to the rotary shaft 2 by being caulked by punches or the like at two locations in the axial direction from the other side.

Therefore, in the vibration generator according to this embodiment, the fixing strength of the vibrator 10 can be further increased in addition to the function and effect of those shown in FIGS. It is suitable when applied to a material having a large thickness dimension.

In each of the above embodiments, the crimping process is performed on a plane substantially orthogonal to the line connecting the rotary shaft 2 and the center of gravity of the vibrator 10, and the vibrator 1 is more than the shaft center of the rotary 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 1
Although one side surface of 0 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 crimping side may be supported by the flat surface.

[0020]

As described above, the vibration generator for a compact wireless interrogator of the present invention comprises a motor and a vibrator made of high specific gravity metal eccentrically fixed to the rotary shaft of the motor. And, the vibrator is provided with an attachment hole at an eccentric position, the rotation shaft of the motor is inserted into the attachment hole, and at the outer peripheral portion of the rotation shaft in a radial direction with respect to a plane including the axis. At the shifted position, one is brought into contact with the flat surface, and the other is fixed at one or more points from the other side to be fixed to the rotary shaft, so that the assembly work is simplified and the cost is reduced. The vibrator is firmly fixed to the rotary shaft because it can be achieved, is hardly affected by dirt on the bonding interface, and does not cause deformation or residual stress on the vibrator or rotary shaft during caulking. be able to

Further, if the caulking position is set to a position deviated to the center of gravity of the vibrator, when the vibrator rotates, the centrifugal force of the vibrator eliminates a gap in the direction of the load acting on the rotary shaft. 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 plan view showing a crimping state of a vibrator on a rotary shaft according to another embodiment of the present invention.

FIG. 5 is a side view showing a vibration generator of a conventional small-sized wireless interrogator.

FIG. 6 is a front view showing a vibration generator of a conventional small-sized wireless interrogator.

[Explanation of symbols]

 2 Rotation axis 10 Transducer 11 Mounting hole 13 Plane

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, one of them is brought into contact with the flat surface at a position displaced in the radial direction with respect to the flat surface including the axis. By crimping at one or more points from the other side in the state where
A vibration generator for a small wireless interrogator, which is fixed to the rotary shaft. 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.