JPH0865948A - Vibration generator of motor for pager - Google Patents

Abstract

PURPOSE: To improve the productivity of a product without deflection or shaking of a balance and to reduce a manufacturing cost by welding to fix the cutout part formed by cutting out the part of a thick part and a rotary shaft of a motor. CONSTITUTION: An axial hole 3 is formed through a balance 2, and a slitlike cutout 22 is longitudinally opened along the rotary shaft 4 of a motor 5 at the wall of a thick part 30 of the opposite side via the hole 3 from the position G of the center of gravity except both ends. After the shaft 4 of the motor 6 is deeply inserted to the hole 3 of the balance 2, the balance 2 of the center of the cutout 22 is laser welded to the shaft 4 to form a welded part 5. When irradiated with laser, the balance 2 is welded to be fixed to the shaft 4 at the laser irradiated part to be integrally fixed. In this case, the balance 2 may not be brought into close contact with the shaft 4 in the part 22 except the part 5. As a result, since the accuracy of the hole of the balance is not questioned, the productivity of the product is improved, the manufacturing cost is reduced, and the deflection or the shaking of the shaft is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generating portion of a pager motor in which a weight is eccentrically fixed to a rotary shaft of the motor by using welding means.

[0002]

2. Description of the Related Art A vibration generating portion of a paging motor is generally formed by fixing a weight to a rotating shaft of the motor in a state of eccentricity. That is, a shaft hole having a diameter slightly larger than the diameter of the rotation shaft of the motor is formed in the weight portion, the rotation shaft of the motor is inserted therein, and a pin is inserted into a screw hole formed vertically toward the shaft hole. The rotation shaft of the motor is fixed by pressing the rotation shaft of the motor or by punching the wall surface top or side surface of the thick wall portion opposite to the center of gravity position G of the weight with the shaft hole interposed therebetween. It goes through the process. As an example, it is possible to raise the actual fair 4-13860 and the actual Kaihei 6-19336, which are shown in FIG. Actual fairness 4-138
In 60, a shaft hole 9 having a diameter slightly larger than the diameter of the rotating shaft 4 of the motor is formed in the weight 8 in association with the vibration generating portion 7 of the motor for paging shown in FIG. Axis 4
Is inserted, and the top of the wall surface of the thick portion on the side opposite to the center of gravity G of the weight 8 with the shaft hole 9 interposed therebetween is punched (from the arrow A direction). In the actual Kaihei 6-19336, the vibration generating section 7 of the pager motor shown in FIG. 7 is punched at two positions radially offset from the plane passing through the axis (from the arrow B direction). It will be tightened. According to these, since the rotating shaft 4 of the motor is gently inserted into the shaft hole 9 of the weight 8, a step of fixing the both by caulking is required.

Further, as shown in FIGS. 8 and 9, a sintered material is sintered into a weight 80 shape using a molding die, and after cooling, the rotary shaft 4 of the motor is inserted into the core pin which is the shaft hole 90. There is also a method of press-fitting, but secondary processing is required to make the core pin's hole size equal to the diameter of the motor's rotating shaft 4, and the inner wall of the hole is cut with a reamer to manage this press-fitting margin. I was giving the dimensions. That is, the rotary shaft 4 of the motor is press-fitted into the shaft hole 90 of the weight 80 processed with high accuracy to form the vibration generating portion 70.

Further, what is shown in FIG.
-30544 and Japanese Patent Laid-Open No. 6-98496 are vibration generating parts 71, both of which are grooves 8 of the weight 81 having a substantially rotation shaft diameter.
After the rotary shaft 4 of the motor is inserted in 2, the opening of the groove 82 is caulked and fixed so that at least a part of the opening is narrowed. Reference numeral 83 is a crimping portion. In particular, JP-A-6
-98496 describes an embodiment by welding as well as pressurizing such as caulking.

[0005]

However, according to the method for crimping the holes as in the above-mentioned Japanese Utility Model Publication No. 4-13860 and Japanese Utility Model Laid-Open No. 6-19336, the size of the core pin hole formed on the weight side and the motor size. Since the diameter of the rotating shaft did not match and the weight was fixed to the rotating shaft of the motor by caulking, the weight often breaks during caulking work, and the caulking force reluctantly causes There is an extremely fatal problem for the motor such that the rotary shaft is unnecessarily bent. This is particularly serious for a rotating shaft having a small diameter such as a coreless motor. Further, when the weight is swaged, the material rises around the weight, and the plating applied to the weight may be cracked or peeled off.
If the caulking is not complete, the weight may fall off the rotary shaft, but it is difficult to keep the pressure constant due to the problem of the hole diameter tolerance of the jig, and the accuracy and the yield are very poor.

Further, as shown in FIGS. 8 and 9, when the sintering method is mainly used for molding the weight, it is extremely difficult to form a small-diameter hole for the shaft hole, that is, the hole for the core pin. However, accurate press-fitting allowance control is impossible in the first place, and press-fitting allowance accuracy is controlled by the reaming process described above.
I had to rely on the next processing.

It is more preferable that the generated vibration is large in a pager of the type that notifies an incoming call by vibration.
A weight that is eccentrically fixed to the rotating shaft of a motor can increase the generated vibration as its specific gravity increases, but if it has the same specific gravity, the thinner the thickness, the more the load on the rotating shaft and rotor and other parts of the motor. Is smaller, the operation of the motor is stable, and the durable life is extended. For this reason, it is desirable to use a sintered material with a high tungsten content ratio, but this makes the hardness of the finished product harder, and when performing secondary processing such as reaming to control the accuracy of the press-fitting margin. Since the weight part is hard, it is a difficult work to cut the core pin's hole, and the reamer is worn out too much.In some cases, the weight may be damaged or the internal adjustment of the motor may be misaligned when the rotary shaft is pressed into the motor. there were.

[0008] Further, JP-A-6-30544 and JP-A-6-3044
According to the method of inserting the rotary shaft 4 of the motor into the groove 82 of the weight 81 and then caulking and fixing this portion so that at least a part of the opening portion of the groove 82 becomes narrow, as in the case of -98496. Although the size of 82 is approximately the diameter of the rotating shaft, even though it is fixed by the caulking portion 83, in the groove 82, the rotating shaft 4 of the motor is shaken or loosened in the direction of the opening of the groove 82. There is a problem with you. Further, there is a very fatal problem for the motor such that the rotating shaft is bent by the caulking force. This is particularly serious for a rotating shaft having a small diameter such as a coreless motor. Further, particularly in the embodiment by welding in JP-A-6-98496, since the weight 81 is melted to form the raised portion corresponding to the crimped portion 83, it takes a relatively long time to melt the weight 81. As a result, heat may be conducted to the motor body through the rotary shaft 4 of the motor and damage the inside of the motor.

The present invention solves the above-mentioned various problems, does not have the problem of damaging each part as in the conventional caulking process, and has a secondary process such as reaming process prior to fixing the weight and the rotary shaft of the motor. Vibration of a pager motor that does not require a machining process, does not require accuracy of the shaft hole of the weight, does not cause wobbling or rattling of the weight, improves the productivity of the product and reduces the manufacturing cost. The challenge is to provide the generator.

[0010]

SUMMARY OF THE INVENTION The above-mentioned problem is, in a vibration generating part of a motor for a pager, comprising a rotating shaft of a motor and a weight fixed to the rotating shaft of the motor in an eccentric state, with respect to the rotating shaft of the motor. Part of the thick part located on the opposite side of the center of gravity of the counterweight is cut out to form a cutout part, and the cutout part and the rotary shaft of the motor of this part are welded and fixed by any welding means. This is achieved by configuring a vibration generating portion of the pager motor. As the welding means, for example, gas welding, electric welding, laser welding or the like can be arbitrarily used.

Further, the notch is formed as a slit along the rotation axis of the motor in the longitudinal direction of the weight. Further, one end of the cutout portion is opened to the front end portion or the rear end portion of the weight. Further, the cutout portion is formed at a plurality of locations along the rotation axis of the motor. Further, the cutout portion is formed by cutting out a thick portion so that most of the rotating shaft of the motor is exposed.

[0012]

According to the present invention, a notch is formed by notching a part of the thick portion located on the side opposite to the center of gravity of the weight with respect to the rotating shaft of the motor, and the notch and the rotation of the motor at this portion are formed. The weight is integrally fixed to the rotating shaft of the motor by welding and fixing the shaft and the shaft with an arbitrary welding means. At this time, the highly accurate press-fitting margin management described above is unnecessary, and it is not necessary to be aware of this point. Further, since no impact is applied to the weight, the rotating shaft, the internal mechanism of the motor, or the like, a defect such as shaft bending due to this does not occur, and problems related to the adhesive such as fixing by adhesion do not occur. That is, in the configuration of the present invention, basically only through the welding process, regardless of the accuracy of the shaft hole of the weight, the product yield is improved, the productivity is improved and the manufacturing cost is lowered, A high bond strength is guaranteed over a long period of time. Further, this configuration also contributes to downsizing of the whole.

In particular, in the present invention, a notch is formed in a part of the thick portion, the weight and the rotary shaft of the motor are welded and fixed at the notch, and a portion of the thick portion where the notch is not formed is formed. It is the bearing of the motor's rotating shaft. Therefore, the problem that the rotating shaft of the motor is shaken or loosened in the direction of the notch does not occur.

In the above operation, even when the cutout portion is formed in a slit shape in the longitudinal direction of the weight along the rotation axis of the motor, one end of the cutout portion has a front end portion or a rear end portion of the weight. Even if the notch is formed at a plurality of locations along the rotation axis of the motor, and the notch is thick enough to expose most of the rotation axis of the motor. The same can be seen in the case of being formed by notching. The rotary shaft is exposed at this notch, and welding is performed here. Even when such a cutout is provided, it is easy to form this cutout, and it is almost unnecessary to pay attention to the shape and dimensional accuracy of the cutout.

It should be noted that regardless of which means such as gas welding, electric welding, laser welding or the like is used as the welding means, it is possible to assume that the effects obtained are basically the same. Since the weight and the rotary shaft are melted and solidified at the welded portion and integrated, there is no problem even if the portions other than the welded portion in the notch portion are not in close contact with each other.

[0016]

Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments.

FIG. 1 illustrates a first embodiment of the present invention. A shaft hole 3 for inserting a rotary shaft is formed in the weight 2 so as to penetrate the weight 2, and a wall surface of the thick portion 20 on the opposite side of the center of gravity G of the weight 2 with the shaft hole 3 in between, Motor 6
A slit-shaped notch 22 is formed along the rotation axis 4 of the weight 2 in the longitudinal direction of the weight 2, leaving both ends of the thick portion 20, and the rotation axis 4 of the motor 6 is formed in the shaft hole of the weight 2. After being inserted deeply in 3, the welded portion 5 is formed by laser welding between the weight 2 and the rotary shaft 4 in the central portion of the slit-shaped notch 22. Reference numeral 21 indicates a bearing portion for receiving the rotary shaft 4 of the motor 6, in which the slit-shaped notch portion 22 is not opened on the thick portion 20.

When a laser beam for welding is irradiated between the weight 2 of the slit-shaped notch 22 and the rotary shaft 4, the weight 2 and the rotary shaft 4 are melted and solidified at the laser-irradiated portion, and both of them are solidified. It is fixed together. At this time, there is no problem even if the weight 2 and the rotary shaft 4 are not in close contact with each other in the cutout portion 22 other than the welded portion 5. That is, there is no need for highly accurate press-fitting margin management for the shaft hole 3, and there is no problem even if the shaft hole 3 is loose with respect to the rotating shaft 4, but rather the weight 2, the rotating shaft 4, and the motor 6 as in the conventional case. Since no impact is applied to the internal mechanism, defects such as shaft bending due to this will not occur. In order to configure the present embodiment, basically, only a laser welding process is performed, secondary processing as in the prior art is not required, and the accuracy of the shaft hole 3 of the weight 2 is not required. The yield is improved, the productivity is improved, the manufacturing cost is lowered, and high bond strength is guaranteed for a long period of time.

In particular, a slit-shaped notch 22 is formed in a portion of the thick portion 20, and the weight 2 and the rotary shaft 4 of the motor 6 are welded and fixed at a portion of the notch 22. At the same time, the portion of the thick portion 20 where the cutout portion 22 is not formed, that is, both ends of the thick portion 20, is the bearing portion 21 of the rotary shaft 4 of the motor 6.
Is made. For this reason, the rotary shaft 4 of the motor 6 is in a state of being fixed at three places, that is, the bearing portions 21 at both ends and the welded portion 5 at the center, so that the rotary shaft 4 of the motor 6 moves in the direction of the notch 22. There are no problems such as blurring or rattling.

In this embodiment, the slit width is 0.4 mm and the laser beam diameter is 0.8 mm.
Taking in millimeters. This is a relatively suitable example, but it is not concerned with the slit width or the beam diameter.
Further, the welded portions 5 may be provided at a plurality of locations inside the cutout portion 22. As an advantage of forming the welded portion 5 using laser welding, for example, the irradiation time of the laser beam can be extremely short such as 0.1 seconds, and the diameter of the irradiation spot can be controlled by controlling the lens. Raise the point that it is easy to change or adjust, that the laser beam can be scanned to weld a certain fixed range, that the welding operation can be automated, etc. Can be done.

Next, FIGS. 2 and 3 illustrate a second embodiment of the present invention. In the above-described first embodiment, the rotary shaft 4 of the motor 6 is fixed at three positions, that is, the bearing portions 21 at both ends of the weight 2 and the central welded portion 5, so that the rotary shaft 4 of the motor 6 is notched 22. Although it has been constructed so as not to shake or rattle in the direction, even if it is at two places, the same action and effect are produced.

Therefore, in the example of FIG. 2, on the wall surface of the thick portion 20 on the opposite side of the center of gravity position G of the weight 2 with the shaft hole 3 interposed therebetween, along the rotation axis 4 of the motor 6 in the longitudinal direction of the weight 2. A slit-shaped notch 23 is opened at the front end portion of the thick portion 20, and after inserting the rotary shaft 4 of the motor 6 deeply into the shaft hole 3 of the weight 2, the slit-shaped notch 23 is formed. A welded portion 50 is formed by gas welding between the weight 2 and the rotary shaft 4 in the rear portion of the portion 23. For this reason, the bearing portion 21 exists only at one location of the front end portion of the weight 2.

Further, in the example of FIG. 3, the center of gravity position G of the weight 2 is
Is a slit-shaped notch 23 in the longitudinal direction of the weight 2 along the rotation axis 4 of the motor 6 on the wall surface of the thick portion 20 on the opposite side across the shaft hole 3, and the rear end portion of the thick portion 20. After the rotary shaft 4 of the motor 6 is inserted deeply into the shaft hole 3 of the weight 2, it is formed between the weight 2 and the rotary shaft 4 in the front part of the slit-shaped notch 23. Then, the welded portion 50 was formed by gas welding.

Next, FIG. 4 illustrates a third embodiment of the present invention. This embodiment is similar to the second embodiment described above.
The welded portion 51 and the bearing portion 21 at one place can prevent the rotation shaft 4 of the motor 6 from being shaken or loosened in the direction of the notch 24.

That is, slit-shaped notches 24 are opened at two locations in the front-rear direction on the wall surface of the thick-walled portion 20 on the opposite side of the center of gravity G of the weight 2 with the shaft hole 3 therebetween, leaving the central portion. Among the slit-shaped notched portions 24 at the front and rear, which are perforated, the welded portion 51 is formed by electric welding between the weight 2 and the rotary shaft 4 of the notched portion 24 on the front side. Therefore, the bearing portion 21 exists in the central portion of the weight 2.

By the way, the weight that is eccentrically fixed to the rotation shaft of the motor increases in vibration as the amount of weight imbalance increases, that is, as the center of gravity of the weight moves away from the rotation shaft in one direction. I will get it. However, as shown in FIG. 1, in the first embodiment, a part (thick part 20) of the weight 2 is provided in the opposite direction to the center of gravity position G with the shaft hole 3 interposed therebetween, except for the slit-shaped notch 22. It exists as a peripheral wall of the hole 3, and the weight of the thick portion 20 acts to bring the position of the center of gravity G closer to the rotating shaft 4 side. If even a portion of the thick portion 20 is unnecessary, a smaller weight may be used to obtain the same amount of imbalance, and a larger weight may be obtained if the weight has the same size. . This situation applies to all vibration generating parts of conventional pager motors and other motor-type vibrators. A fourth embodiment to be described next is to solve this problem together.

FIG. 5 illustrates a fourth embodiment of the present invention. A shaft hole 3 for inserting a rotary shaft is formed in the weight 2 so as to pass through the weight 2. The wall surface of the thick portion 20 on the opposite side of the shaft hole 3 from the center of gravity position g of the weight 2, Motor 6
The notch 25 in the longitudinal direction of the weight 2 along the rotation axis 4 of
The notch portion 25 is formed so that the rotary shaft 4 of the motor 6 is exposed to a large extent and the both ends of the thick portion 20 are left.
The welded portion 5 is formed by laser welding between the weight 2 and the rotary shaft 4 at the front end portion of the. Reference numeral 21 indicates a bearing portion.

In the case of the present embodiment, the thick portion 20 within the chain line shown in FIG. 1 is unnecessary. For this reason, the position of the center of gravity g moves away from the rotary shaft 4, a larger amount of imbalance can be obtained than in the first embodiment, and large vibrations can be generated despite the smaller and lighter weight. Further, since the weight 2 is downsized and the workability at the time of insertion is improved, the cost can be further reduced.

At the same time, the weight 2 and the rotary shaft 4 of the motor 6 are welded and fixed at a part of the cutout portion 25, and at the same time, the rotary shaft 4 of the motor 6 is fixed by the bearing portions 21 at the two front and rear portions. There is. For this reason, the rotation shaft 4 of the motor 6 is
Since the bearing portion 21 and the welded portion 5 are fixed at three places, the problem that the rotating shaft 4 of the motor 6 is shaken or rattles in the direction of the notch 25 does not occur.

Next, FIG. 6 illustrates a fifth embodiment of the present invention. As in the case of the fourth embodiment described above, in order to reduce the thickness portion 20 and move the position of the center of gravity g away from the rotation shaft 4, the window-shaped notch portion 26 is formed along the rotation shaft 4 of the motor 6 in the longitudinal direction of the weight 2. The rotary shaft 4 of the motor 6 is divided into five holes so as to expose most of the rotary shaft 4, and a hole is formed between the weight 2 and the rotary shaft 4 at the front end portion of the notch 26 at one of the holes. Is formed by gas welding.

As a result, in the present embodiment as well as in the above-mentioned fourth embodiment, a part of the thick portion 20 in the first embodiment is unnecessary, and a larger amount of imbalance is obtained than in the first embodiment. It has the effect of becoming a smaller and lighter weight. The position of the center of gravity g at this time is clearly present at a position farther from the rotation axis 4 than the position of the center of gravity G of the first embodiment, and if the weight is the same, the generated vibration is large.

The present invention can be applied to the entire vibration generating portion of a so-called pager motor, but can also be used to notify an incoming call due to vibration of a mobile phone or the like.
In either case, in order to reduce the size and weight of the device,
A coreless motor is often used as the motor. Since the vibration generating portion of the pager motor notifies that a so-called pager is being called by a sensory vibration rather than a sound such as an electronic sound, it is preferable that the notification vibration is large. it is obvious. As described above, the weight that is eccentrically fixed to the rotation shaft of the motor is
The greater the specific gravity of the weight, the greater the vibration that can be generated.However, if the weight is the same, the thinner the thickness, the smaller the burden on the motor parts such as the thin rotary shaft and rotor.
It is known that the operation of the motor is stable and the durability life is extended. Therefore, it is also preferable to use a sintering weight mainly made of a super-polymerized gold material having an increased content ratio of tungsten.

In addition to this, the present invention is not limited to the above-mentioned embodiment, the material and shape of the weight are basically arbitrary, the welding means can be appropriately selected, and the welding place can be freely set within a possible range. Even if a component such as a bush is interposed between the rotating shaft of the motor and the weight, this component is included in either the rotating shaft or the weight. A general motor-type vibrator having the above-mentioned vibration generating unit is also within the scope of the present invention. Also, the type of motor used is not particularly limited.

In the above-mentioned laser welding and the like, when welding is performed in the atmosphere, a phenomenon in which the welded portion is oxidized can be seen. However, if the formation of this oxide film is considered to be unfavorable, argon gas should be used. The welding work may be performed in an inert gas atmosphere such as. In the case of manufacturing the present invention using an automatic welding device, the notch hole in the side surface of the weight of the present invention is a welding target and can also serve as a mark for this. It is also possible to adopt.

[0035]

As described above, according to the present invention, in a vibration generating portion of a pager motor, which comprises a rotating shaft of a motor and a weight fixed to the rotating shaft of the motor in an eccentric state, a weight is provided with respect to the rotating shaft of the motor. A portion of the thick-walled portion located on the opposite side of the center of gravity is cut out to form a cutout portion, and the cutout portion and the rotary shaft of the motor of this portion are welded and fixed by any welding means. Since it is a vibration generating part of the motor for paging, defects such as shaft bending like conventional caulking do not occur, high-precision press-fitting margin control is unnecessary, and the weight and the rotating shaft of the motor It is possible to reduce the number of secondary processing steps such as reamer processing prior to fixing, without impacting the weight, rotating shaft or motor internal mechanism, and without causing problems such as damage and termination of these. Welding also ensures a high bond strength over a long period of time, Configuration of consists to contribute to downsizing of the whole.

In particular, in the present invention, the notch is formed in a part of the thick portion, the weight and the rotary shaft of the motor are welded and fixed in the notch, and the portion of the thick portion where the notch is not formed is It is the bearing of the motor's rotating shaft. Therefore, the problem that the rotating shaft of the motor is shaken or loosened in the direction of the notch does not occur.

As a result, the precision of the shaft hole of the weight is not required, the product yield and productivity are improved, the manufacturing cost is reduced, and the deviation and rattling of the rotary shaft of the motor are eliminated. I was able to achieve it.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a plan view of a second embodiment of the present invention.

FIG. 3 is a plan view of a second embodiment of the present invention.

FIG. 4 is a plan view of a third embodiment of the present invention.

FIG. 5 is a side view of the fourth embodiment of the present invention.

FIG. 6 is a plan view of a fifth embodiment of the present invention.

FIG. 7 is a front view of a conventional example.

FIG. 8 is a perspective view of a conventional example.

FIG. 9 is a front view of a conventional example.

FIG. 10 is a perspective view of a conventional example.

FIG. 11 is a side view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration generating part 10 Vibration generating part 11 Vibration generating part 12 Vibration generating part 2 Weight 20 20 Thick part 21 Bearing part 22 Notch 23 Notch 24 Notch 25 Notch 26 Notch 3 Shaft hole 4 Rotating shaft 5 Welding part 50 Welded part 51 welded part

Claims (8)

[Claims] 1. A vibration generating portion of a pager motor, comprising a rotating shaft of a motor and a weight fixed to the rotating shaft of the motor in an eccentric state, on the side opposite to the center of gravity of the weight with respect to the rotating shaft of the motor. A portion of the thick portion located at the notch to form a notch, and the notch and the rotary shaft of the motor at this portion are welded and fixed by any welding means. Vibration generator. 2. The vibration generating portion of the pager motor according to claim 1, wherein the cutout portion is formed as a slit along the rotation axis of the motor in the longitudinal direction of the weight. 3. The vibration generating portion of the pager motor according to claim 1, wherein one end of the cutout portion is opened to a front end portion or a rear end portion of the weight. 4. The cutout portion is provided at a plurality of locations along a rotation axis of the motor.
Alternatively, the vibration generating portion of the pager motor according to claim 2. 5. The vibration generation of a pager motor according to claim 1, wherein the cutout portion is formed by cutting out a thick portion such that most of a rotary shaft of the motor is exposed. Department. 6. The method according to claim 1, wherein the welding means is gas welding.
A vibration generator of the pager motor according to claim 5. 7. The welding means is electric welding.
A vibration generator of the pager motor according to claim 5. 8. The vibration generating portion of the pager motor according to claim 1, wherein the welding means is laser welding.