JP2538764B2 - Motor deformation prevention structure for vibration generation - 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 generating motor used in a portable device for making a notification by vibration.

[0002]

2. Description of the Related Art Conventional vibration generating motors have a
As disclosed in Japanese Patent Publication No. 13116, as shown in FIG. 4A, a semicircular eccentric weight 1 is attached to a rotary shaft 2 extending outside the motor outer peripheral case 1.
3 is attached, or as shown in FIG. 4B, a semicircular eccentric weight 13 is attached inside the motor outer peripheral case 1.
The rotation caused vibrations.

[0003]

In this conventional vibration generating motor, the weight 13 has a semicircular shape as shown in the detailed structure of FIGS. 5 (a) and 5 (b). When a shock is applied, the rotary shaft 2 may be largely deformed from the root of the motor outer peripheral case 1 in the direction where there is no substantial portion of the weight 13, as indicated by the dotted line. As a measure for preventing such deformation, it is necessary to increase the diameter of the rotating shaft 2 or use a material having a high hardness for the rotating shaft 2. Therefore, when miniaturizing the motor,
There is a problem that the material hardness of the rotating shaft and the thickness of the rotating shaft are restricted.

Further, in the case where the weight is mounted inside the motor outer case, the deformation of the rotating shaft is restricted by the weight hitting the outer case of the motor, so that plastic deformation of the shaft due to impact is less likely to occur. Compared to the structure in which the weight is attached to the outside of the motor, the structure becomes complicated and it becomes difficult to reduce the size. Further, there is a problem that it is difficult to manufacture because the manufacturing method is special.

An object of the present invention is to generate a vibration in a motor having a weight outside the outer case, which makes it difficult for the rotating shaft to be deformed due to an impact such as a drop, facilitates miniaturization and is easy to manufacture. It is to provide a deformation prevention structure for a motor for use.

[0006]

The vibration generating motor deformation prevention structure of the present invention is a vibration generating motor in which a weight rotates in accordance with the rotation of the motor to generate vibration. An eccentric cylindrical part made of a material having a large specific gravity and having an eccentric shape is provided with a non-eccentric cylindrical part, and the gap between the holder for holding the motor and the cylindrical part of the weight is rotated. It is set below the elastic deformation region of the shaft.

[0007]

Next, the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention,
(A) is a side view and (b) is a front view.

In the vibration generating motor of the first embodiment, a motor outer case 1 having a built-in motor body is held by holders 5 and 6, and a motor main body rotating shaft 2 extending from the motor outer case 1 is held. A semicircular eccentric weight 3 made of a material having a large specific gravity is attached. Vibration occurs due to the eccentric weight 3 rotating as the motor rotates. Here, as the deformation preventing structure, a cylindrical portion 3a which is not eccentric is attached to the tip portion of the eccentric weight 3.
Is provided. The size (diameter) of the cylindrical portion 3a is
The four gaps 4 closest to the holders 5 and 6 are
It is set so as to be equal to or smaller than the dimension of the elastic deformation region of the material of the rotating shaft 2.

In the first embodiment having such a structure,
Even if the rotary shaft 2 is deformed due to an impact caused by dropping or the like, when the motor is rotated to generate vibration, the cylindrical portion 3a that rotates together with the rotary shaft 2 and the weight 3 hits the holders 5 and 6 and is restricted. Since the deformation of the rotating shaft 2 is suppressed to the deformation in the elastic deformation region based on the gap 4, the rotating shaft 2 returns to the original state and is prevented from being permanently deformed.

In the weight 3, the cylindrical portion 3a is provided at the tip of the weight 3, and the cylindrical portion 3a is attached so as to be farthest from the root of the rotary shaft 2. By doing so, the slight deformation of the rotary shaft 2 causes the cylindrical portion 3 to move.
Since a large displacement appears in a, the restriction caused by hitting the holders 5 and 6 is applied at an early point, and as a result, the deformation of the rotating shaft 2 can be suppressed to a small level.

FIG. 2 shows a second embodiment of the present invention,
(A) is a perspective view and (b) is a side view.

In FIG. 2, the components of the motor outer case 1, the rotary shaft 2, the weight 3, the cylindrical portion 3a and the gap 4 are exactly the same as those of the first embodiment, except that the tubular pipe 7 is different. It is provided. That is, since the holders 5 and 6 described above can secure the gap 4 with the cylindrical portion 3a of the weight 3, the holders 5 and 5 can be provided as in the second embodiment.
Instead of 6, a cylindrical pipe 7 having a gap 4 with the cylindrical portion 3a may be attached to the motor outer peripheral case 1 and integrated with the vibration generating motor. The rotating cylindrical portion 3a may be cylindrical. The rotating shaft 2 is regulated by hitting the pipe 7 of
Is prevented from being deformed.

FIG. 3 shows a third embodiment of the present invention,
(A) is a perspective view, (b) is a side view, (c) is a front view.

In the third embodiment, the height h of the holder 10 is set to be at least half or more of the motor outer peripheral case 1 so as to secure the gap 4 between the weight 3 and the cylindrical portion 3a, and the holder 10 is fixed. The structure is integrated with the portable device housings 8 and 9. In this case as well, the rotating cylindrical portion 3a is restricted by hitting the holder 10 and the portable device housings 8 and 9, and the rotation shaft 2 is prevented from being deformed.

According to the configuration of the embodiment of the present invention as described above, the gap 4 between the holders 5, 6, 10 and the weight 3 is restricted to be small, so that the rotary shaft 2 is deformed by an impact such as dropping. Also, the cylindrical portion 3a of the weight 3 is attached to the holders 5, 6 and 10.
The deformation is restored and the rotation does not stop.

Further, although a part of the weight 3 is a cylindrical portion 3a, the original eccentric amount of the weight 3 can be secured in a portion other than the cylindrical portion 3a, so that the vibration amount does not decrease.

[0018]

As described above, according to the present invention, a part of the eccentric weight is formed in a cylindrical shape and the gap between the weight and the holder is regulated. Since it can be secured and suppressed, and the diameter of the rotating shaft can be reduced accordingly, there is an effect that the size can be reduced. Further, by adopting a motor configuration in which the weight is outside the outer case, the assembling property is better and the cost can be reduced as compared with the motor in which the weight is inside the outer case. Therefore, it is possible to provide a small vibration generating motor that is inexpensive and strong against impact.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, (a) is a side view and (b) is a front view.

FIG. 2 shows a second embodiment of the present invention, (a) is a perspective view and (b) is a side view.

FIG. 3 shows a third embodiment of the present invention, (a) is a perspective view, (b) is a side view, and (c) is a front view.

FIG. 4 shows a conventional vibration generating motor (a).
Is a first example, and (b) is a perspective view of a second example.

5A is a side view and FIG. 5B is a front view showing details of a conventional example.

[Explanation of symbols]

 1 Motor Outer Case 2 Rotating Shaft 3,13 Weight 3a Cylindrical Part 4 Gap 5,6,10 Holder 7 Cylindrical Pipe 8,9 Portable Device Case

Claims (4)

(57) [Claims] 1. A vibration generating motor in which a weight rotates to generate vibration as the motor rotates, a part of the weight having a large specific gravity attached to a rotation shaft of the motor and having an eccentric shape. Vibration generation characterized in that a cylindrical portion which is not eccentric is provided on the shaft, and the gap between the holder for holding the motor and the cylindrical portion of the weight is set to be equal to or less than the elastic deformation region of the rotating shaft. Motor deformation prevention structure. 2. The vibration preventing motor deformation preventing structure according to claim 1, wherein the holder is integrated with a motor outer peripheral case having the motor built therein. 3. The vibration generating motor deformation preventing structure according to claim 1, wherein the holder is integrated with a portable device housing that houses the vibration generating motor. 4. The vibration-generating motor deformation preventing structure according to claim 1, wherein the cylindrical portion is provided at a tip portion of the weight.