JP3527799B2 - Cylindrical coreless vibration motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an ultra-fine cylindrical coreless vibration motor having a diameter of 3 mm, so that a large motor torque can be obtained even if the diameter is reduced. A cylindrical coreless vibration motor that uses a cylindrical field magnet instead of a cylindrical field magnet, and that does not cause shaft bending even if an efficient eccentric weight is used to generate large vibrations. , Pager (calling device), vibration alarm device such as massager, and other devices that require a vibration source.

[0002]

2. Description of the Related Art For example, in a pager (so-called pager), in order to notify that a telephone call is made, in recent years, a vibration method is used instead of sound. In a pager that causes this vibration, generally, a semi-circular vibration generating eccentric weight is fixed to the shaft of a cylindrical coreless motor with an outer diameter size of 6 mm or more. When the shaft rotates, the eccentric weight is partially circled. Since it rotates eccentrically, its vibration is transmitted to the motor housing of the cylindrical coreless motor. Therefore, the vibration propagates to the casing of the pager equipped with this cylindrical coreless vibration motor with eccentric weight, and the pager is worn on the body. By sensing the vibration, he can know that there is a telephone call.

[0003]

In this cylindrical coreless vibration motor using the conventionally used cylindrical coreless motor, the eccentric weight is attached only to the shaft slightly protruding from one end of the cylindrical motor housing. Therefore, in order to obtain an ultra-fine cylindrical coreless vibration motor with a diameter of 3 mm, of course, if the diameter is made small, the motor torque will naturally be small and large vibration cannot be obtained. ， It becomes impractical.

Here, in order to obtain a large motor torque, the conventional cylindrical coreless vibration motor has a structure in which a cylindrical field magnet is used and a shaft is passed through the cylindrical field magnet. , The cylindrical space magnet is no longer used because the structural space of the motor is limited and a larger one cannot be used (conversely, a smaller one with a weaker magnetic force must be used). Cannot generate a large magnetic force (strong magnetic force), so the motor torque cannot be increased. As a result, a heavy eccentric weight cannot be used to obtain a large vibration, and a large vibration is generated. It is impossible to obtain a cylindrical coreless vibration motor.

Since the outer shape of the motor becomes smaller, many of the constituent elements of the motor need to be made smaller accordingly, but the number of rotations is increased in order to obtain the same vibration as that of the conventional 6 mm motor. If this is done, the shaft must also have a very small outer diameter size, and the shaft will bend, causing damage to the cylindrical coreless vibration motor.

Although the eccentric weight is naturally reduced as the cylindrical coreless vibration motor becomes smaller, a large vibration cannot be obtained if the conventional eccentric weight is used as it is. Considering the entire motor structure including the eccentric weight. , If it is not organically combined, it will not be possible to support a small cylindrical coreless vibration motor with an outer diameter of 3 mm or 4 mm, and the higher the ultra-fine shape, the higher the precision required and the difficulty in assembly and mass productivity. Has the disadvantage of not being excellent.

That is, according to the present invention, even in a small cylindrical coreless vibration motor having an outer diameter size of 3 mm or 4 mm, a strong magnetic force is obtained, a large torque is generated, and a large vibration is generated efficiently. Even if the eccentric weight is used to rotate at high speed, shaft bending does not occur,
The challenge was to obtain an ultrafine cylindrical coreless vibration motor that has stable quality accuracy, is easy to assemble, and can generate large vibrations.

[0008]

The object of the present invention is as follows.
A cylindrical field magnet (2) is concentrically fixedly built into the other end of the cylindrical coreless vibration motor body (1), and a cylindrical metal bearing (3) is provided at one end of the cylindrical coreless vibration motor body above the one end. Commutation with the upper end fixed to the other end of the shaft (7) so as to be rotatably supported in the radial air gap between the cylindrical coreless vibration motor body and the field magnet. The cylindrical coreless armature (6) is fixed to the commutator hub (5) side having the child (4), one end of the shaft (7) is projected from the metal bearing, and the shaft protruding from the metal bearing is fixed. Reverse L at one end
The attachment base (8) of the eccentric weight (8) for generating a V-shaped vibration
The motor casing is fixed to a), and the eccentric weight portion (8b) of the eccentric weight is rotated while being eccentric and eccentric to the side surface outer peripheral portion of the metal bearing via a radial gap.
Of the end cap (16) attached to one end of (14)
A through hole (18) is formed in the center of the field magnet.
Taper-shaped projections (2
a) is press-fit into the through hole (18) of the end cap (16)
This can be achieved by providing a cylindrical coreless vibration motor characterized by being fixed .

Further, in order to further improve the cylindrical coreless vibration motor, the metal bearing can be mounted in a bearing house formed so as to project long above one end of the coreless vibration motor body.

Furthermore, the coreless vibration motor body is provided with a brush holder in which power supply connector terminals electrically connected to the positive power supply terminal side and the negative power supply terminal side for supplying power to the two brushes are led out to the outside. Attached to the side of
This is possible by bringing the brush into sliding contact with the commutator.

[0011]

In the cylindrical coreless vibration motor of the present invention, a cylindrical field magnet 2 is built in the cylindrical coreless vibration motor body 1. Therefore, the cylindrical field magnet 2
Since it is not necessary to provide a hole for passing the shaft 7 in the center of the field magnet as in the case of a conventional cylindrical field magnet, the manufacturing cost of the field magnet is low and the field magnet is cylindrical. Since the magnet volume becomes large and a large magnetic flux can be generated, a sufficiently large practical motor torque can be generated and a stable rotation speed can be obtained even if the outer diameter size is as small as 3 mm or 4 mm. As a result, the efficiency does not drop compared to the conventional 6 mm size cylindrical coreless vibration motor,
That is, the efficiency is good and the performance is stable.

The eccentric weight 8 is formed to be long in the axial direction in order to secure the weight of the eccentric weight whose outer diameter size is reduced and to increase the vibration in order to construct the ultra-fine cylindrical coreless vibration motor. I am using one. For this reason, it is necessary to form the shaft 7 having a smaller outer diameter size so as to project further at one end (upper end) of the cylindrical coreless vibration motor body 1, and the shaft 7 is eccentric due to partial circular motion of the eccentric weight 8 due to centrifugal force. The rotation causes the shaft to bend. As a result, the shaft 7 is prevented from bending and the lower end of the eccentric weight 8 is axially moved in order to prevent rotation failure, start failure, etc. due to friction with the upper end of the cylindrical coreless vibration motor body 1 (bearing fixing end cap 13). The long cylindrical bearing house 9 is attached to the upper end of the coreless vibration motor body 1 (bearing fixing end cap 13).
The cylindrical metal bearing 3 is mounted in a bearing house 9 which is fixed to one end of the shaft, and is formed above the shaft so as to project long in the axial direction, and the shaft 7 is rotatably supported, thereby eliminating the above-mentioned drawbacks. it can.

Further, in the case of a superfine cylindrical coreless vibration motor, since the outer diameter size of the shaft 7 is small as described above, the cylindrical coreless vibration motor is dropped, or the pager incorporating it is dropped or shocked. In the same manner as above, bending of the shaft 7 occurs, and the lower end of the eccentric weight 8 rubs against the upper end of the cylindrical coreless vibration motor body 1 (end cap 13 for fixing the bearing), which causes poor rotation and startup. It causes defects. In order to prevent this from happening, the cylindrical coreless vibration motor of the present invention is
The weight of the eccentric weight 8 is reduced without reducing the vibration amount. That is, the vibration generating eccentric weight 8 is formed in an inverted L shape unlike the conventional general shape, and the attachment base portion 8a of the eccentric weight 8 is fixed to one end of the shaft 7 projecting from the metal bearing 3 and the eccentric weight is formed. Eccentric weight part 8 of weight 8
Since b is rotated around the outer periphery of the side surface of the metal bearing 3 while being eccentric and eccentric through the radial gap, the eccentric weight 8 is light in weight, and the cylindrical coreless vibration motor is used. It is possible to generate a large vibration even if is an ultrafine shape with a small outer diameter size.

Further, the brush holder 12 is simply mounted in the through hole 15 for mounting the brush holder formed on the side surface of the cylindrical motor casing 14 constituting the cylindrical coreless vibration motor main body 1 against the elastic force. Sliding contact between the commutator 4 and the brushes 10-1 and 10-2, which has been troublesome in the past, can be easily performed. Moreover, the cylindrical coreless vibration motor can be easily installed in the pager simply by mounting the power supply connector terminals 11-1 and 11-2 of the brush holder 12 in the socket provided on the electronic component mounting board in the pager. Can be installed and built-in. Therefore, there are less troubles as compared with the conventional one using the power supply lead wire, and a conductor such as gold plating on the inner surface of the motor casing is compared with the one having the power supply terminal at both ends. Since it does not need to be processed, it is structurally easy and can be formed at low cost. Further, such a measure as the brush holder 12 does not allow the shaft 7 to pass through the field magnet 2 as in the cylindrical coreless vibration motor of the present invention, and the shaft 7 is simply one metal bearing 3. Because it is supported by the bearing metal 3
Since there is no conventional brush holder between the commutator hub 5 and the commutator hub 5, the cylindrical coreless vibration motor of the present invention can be easily assembled and the centering of the shaft can be facilitated. Since there is no conventional brush holder at such a position, there is nothing that becomes an alien substance when the brush holder 12 is mounted, and thus a particularly useful measure can be configured.

[0015]

1 is an external perspective view of a cylindrical coreless vibration motor of the present invention, FIG. 2 is a longitudinal sectional view of the same motor, and FIG. 3 is an exploded perspective view of the same motor. FIG. 4 is an exploded perspective view in which FIG. 3 is further partially disassembled. A cylindrical coreless vibration motor as an embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

Outer diameter 3 mm made of magnetic material, thickness 0.5
End caps 1 for fixing a bearing in which both ends of a cylindrical motor casing 14 of about mm are formed of resin or the like.
3. The cylindrical coreless vibration motor body 1 is configured by mounting the field magnet fixing end cap 16.
The end caps 13 and 16 each have a through hole 1 at the center thereof.
7 and 18 are formed, and the through hole 18 of the end cap 16 is formed in the end cap 16 for fixing the field magnet.
The protrusion 2 formed on the lower end of the cylindrical field magnet 2
An adhesive is used for a and is attached and fixed to the through hole 18 against the elasticity of the through hole 18. As a result, the cylindrical field magnet 2 is mounted and fixed to the lower end (the other end) of the motor casing 1 and arranged and fixed concentrically in the motor casing 1. The field magnet 2 is much cheaper if it has a cylindrical shape compared to a cylindrical field magnet, and since the magnet volume increases, a large (strong) magnetic force is generated to generate a large motor torque. it can. The cylindrical field magnet 2 is a two-pole magnet having magnetic poles of N pole and S pole in the circumferential direction, and in order to generate a sufficiently large torque in a cylindrical coreless vibration motor. ，
It is formed using a magnet with strong magnetic properties such as neodymium, boron and iron.

A cylindrical coreless armature 5 constituting a rotor is interposed in a radial gap between the motor casing 14 and the field magnet 2 and is rotatably supported by the means described later at that position. . The cylindrical coreless armature 5 has a hexagonal winding in this embodiment, and an adhesive tape (not shown) is wound around the center of the outer circumference.

The cylindrical coreless armature 5 is fixed to the outer periphery of the lower end portion of the commutator hub 5 by using a means such as an adhesive.
The commutator hub 5 is made of resin, and the commutator 4 including a commutator piece group is provided on the outer periphery of the upper end portion thereof.

One end (lower end) of a shaft 7 is fixed to the commutator hub 5, and the shaft 7 is provided above the cylindrical coreless vibration motor body 1 through a through hole formed in a bearing fixing end cap 13. It has a long projection. The other end of the cylindrical bearing house 9 is fixed to the through hole formed in the bearing fixing end cap 13 attached to one end of the motor casing 14, and the bearing house 9 is placed above the bearing fixing end cap 1. The protrusion is formed to be long in the axial direction. A cylindrical metal bearing 3 is mounted in the bearing house 9 to rotatably support the shaft 7. In addition, metal bearing 3
Is formed such that the central portion of the shaft through hole formed extending in the axial direction is dented in the outer diameter direction, and only the inner circumferences of both end portions thereof are in sliding contact with the shaft 7. A retaining ring 19 and a liner 20 are provided between the commutator hub 5, the bearing housing 9 and the metal bearing 3.

The shaft 7 protruding from one end of the metal bearing 9 is fixed at one end thereof to an attachment base 8a of a vibration generating eccentric weight 8 made of a metal having a high specific gravity such as a tungsten alloy having an inverted L-shaped vertical section. Eccentric weight portion 8 of the eccentric weight 8
The eccentric weight 8 is rotated while eccentric and eccentric to the outer peripheral surface of the bearing housing 9 formed on the outer periphery of the metal bearing 3 through a radial gap.
A liner -21 is interposed between the lower surface of the attachment base portion 8a of the eccentric weight 8 and the upper ends of the bearing housing 9 and the metal bearing 3.

At the upper end of the motor casing 14, there is a through hole 1 such as a notch having a shape substantially matching the shape of a protrusion 22 formed on the inner surface of a brush holder 12 made of resin.
5 is formed, and the brush holder 12 is attached to the side surface of the motor casing 14 by inserting the projection 22 into the through hole 15 against the elasticity (or together with an adhesive). . This makes the brush holder 1
Brushes 10-1 and 10-2 made of a conductor formed to project on the inner surface of 2 for connecting to the positive and negative power sources are in sliding contact with the commutator 4. The brushes 10-1 and 10-2 are electrically connected to the power supply connector terminals 11-1 and 11-2, which are formed to project on the outer surface of the brush holder 12 through a terminal made of a conductor in the brush holder 12. It is connected to the.

FIG. 5 is an exploded perspective view of a cylindrical coreless vibration motor showing another embodiment of the present invention, and FIG. 6 is a longitudinal sectional view of the cylindrical coreless vibration motor. This cylindrical coreless vibration motor will be described with reference to FIG. 6, except that the bearing house 9 and the cylindrical motor casing 14 are used instead of the magnetic body in which they are integrated. Naru bearing house and motor housing 23
To form a cylindrical coreless vibration motor body 1 ',
The number of parts to be assembled is reduced to enable mass production at low cost. Others have been described in the above embodiments, so refer to the above description.

[0023]

[Effect] According to the cylindrical coreless vibration motor of the present invention,
Since a columnar field magnet with a strong magnetic force is used, the performance of rotation speed and torque can be stably obtained, and large vibration can be obtained, even though it has a small outer diameter size. In addition, in order to construct an ultra-fine cylindrical coreless vibration motor, in order to secure the weight of the eccentric weight with a smaller outer diameter size and to increase the vibration, the eccentric weight formed long in the axial direction is used. Even if the shaft is not bent and the eccentric weight is made longer in the axial direction according to the ultra-fine shape of the motor, the shaft is not bent due to the eccentric rotation due to the eccentric weight, and the cylindrical coreless vibration motor rotates. It is possible to prevent defects and start-up defects and to obtain a highly reliable cylindrical coreless vibration motor.

Further, even if the outer diameter of the shaft 7 is small, the shaft 7 has a structure for protecting the shaft. Therefore, when the cylindrical coreless vibration motor is dropped, or the pager incorporating it is dropped or shocked. Even if there is, shaft bending does not occur, the cylindrical coreless vibration motor performs stable rotation, and the desired large vibration can be generated.

Furthermore, because of the simplicity of the structure of this cylindrical coreless vibration motor, the brush can be very easily slidably contacted with the commutator in order to energize the armature by sliding contact with the commutator. There is an effect that mass production assembly can be performed very easily without adopting the conventionally troublesome method for assembly and mounting.

[Brief description of drawings]

FIG. 1 is an external perspective view of a cylindrical coreless vibration motor showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the motor.

FIG. 3 is an exploded perspective view of the motor.

FIG. 4 is a perspective view when the thing of FIG. 3 is further disassembled.

FIG. 5 is an external perspective view of a cylindrical coreless vibration motor showing another embodiment of the present invention.

FIG. 6 is a vertical sectional view of the motor.

[Explanation of symbols]

1,1 'Cylindrical coreless vibration motor body 2 Cylindrical field magnet 2a protrusion 3 metal bearings 4 commutator 5 commutator hub 6 Cylindrical coreless armature 7 shaft 8 Eccentric weight 8a Mounting base 8b Eccentric weight part 9 bearing house 10-1, 10-2 brush 11-1, 11-2 Power supply connector terminal 12 brush holder 13 Bearing fixing end cap 14 Cylindrical motor casing 15 Through hole for brush holder installation 16 Field magnet fixing end cap 17,18 through hole 19 retaining ring 20,21 liner 22 Projection 23 Bearing housing and motor housing

Claims (3)

(57) [Claims] 1. A cylindrical coreless vibration motor main body (1) has a cylindrical field magnet (2) concentrically fixedly incorporated in the other end thereof, and the cylindrical coreless vibration motor main body (1) has a cylindrical shape at one end above the one end. A metal bearing (3) is formed so as to project long, and an upper end is provided at the other end of the shaft (7) so as to be rotatably supported in a radial air gap between the cylindrical coreless vibration motor body and the field magnet. The cylindrical coreless armature (6) is fixed to the side of the commutator hub (5) having the commutator (4) whose part is fixed, and one end of the shaft (7) is projected from the metal bearing, One end of the shaft protruding from the shaft is fixed to the attachment base portion (8a) of the inverted L-shaped vibration generating eccentric weight (8), and the eccentric weight portion (8) of the eccentric weight is fixed.
b) is rotated around the outer peripheral portion of the side surface of the metal bearing while having an eccentricity and an eccentricity via a radial gap.
The end cap (1 attached to one end of the thing (14)
A through hole (18) is formed in the center of 6),
Tapered protrusion formed on the end of the magnet (2)
(2a) in the through hole (18) of the end cap (16)
A cylindrical coreless vibration motor characterized by being press-fitted and fixed . 2. The cylindrical coreless vibration motor according to claim 1, wherein the metal bearing is mounted in a bearing house (9) formed so as to project long above one end of the coreless vibration motor body. 3. A power supply connector terminal (11-) electrically connected to the positive power supply terminal side and the negative power supply terminal side for supplying power to the two brushes (10-1, 10-2), respectively.
1, 11-2) is a brush holder (1
The cylindrical shape according to claim 1 or 2, wherein 2) is mounted on a side surface of the coreless vibration motor body, and the brushes (10-1, 10-2) are slidably contacted with a commutator. Coreless vibration motor.