阅读说明：本技术 马达 (Motor with a stator having a stator core ) 是由 小柳尚久 仓惠子 于 2019-10-24 设计创作，主要内容包括：本发明提供托架与刷之间的不必要的空间较少的马达。本发明的马达的托架(40)固定于具有开口端部的有盖筒状的铁制的马达壳体的开口端部。刷基体的开口端部从马达壳体的外部固定于托架(40)。刷基体具有形成于刷基体的有底筒状的内侧的刷基体空间部(53),该刷基体空间部(53)经由托架的贯通孔(41)与马达壳体的内部空间部连通。在刷基体空间部(53)固定有刷。(The invention provides a motor with less unnecessary space between a bracket and a brush. A bracket (40) of a motor is fixed to an open end of a motor case made of iron and having a cover cylindrical shape with an open end. The open end of the brush base body is fixed to a bracket (40) from the outside of the motor case. The brush base body has a brush base body space part (53) formed on the inner side of the brush base body in a bottomed cylindrical shape, and the brush base body space part (53) is communicated with the inner space part of the motor housing through the through hole (41) of the bracket. A brush is fixed in the brush base space (53).)

1. A motor is provided with:

a motor housing having a cover cylindrical shape and having an open end;

a drive magnet fixed to an inner peripheral surface of the motor case;

a rotor having a copper wire, disposed to face an inner peripheral surface of the driving magnet;

a rotating shaft having a commutator and fixed to the rotor;

a hollow plate-shaped bracket having a through hole through which the rotating shaft passes;

the brush is connected with the commutator;

a bottomed cylindrical resin brush base body having an opening end portion; and

bearings fixed to the motor housing and the brush base body, respectively, for axially supporting the rotary shaft,

the bracket is fixed to an open end of the motor case,

the open end of the brush base is fixed to the bracket,

the brush base body has a brush base body space portion formed inside the bottomed tubular shape of the brush base body, the brush base body space portion communicating with the internal space portion of the motor housing via the through hole of the bracket,

the brush is fixed to the brush base body space.

2. The motor of claim 1,

a motor case stepped portion having a diameter larger than that of an inner peripheral surface of the motor case is formed on an inner peripheral surface of the opening end portion of the motor case,

the outer peripheral surface of the bracket is formed to be the same as the inner peripheral surface of the stepped portion of the motor housing,

the outer peripheral surface of the bracket is in contact with the inner peripheral surface of the stepped portion of the motor housing,

the outer peripheral surface of the brush base body is formed smaller than the outer peripheral surface of the bracket,

the opening end of the motor case is riveted to the outer peripheral surface of the bracket, and the bracket is fixed to the opening end of the motor case.

3. The motor of claim 1,

the brush protrudes from the brush base body to the outside of the outer circumferential surface of the motor housing in the radial direction,

the upper end of the brush is disposed below the opening end of the motor case.

4. The motor of claim 1,

a brush base body stepped portion which is lowered downward is formed at an opening end portion of the brush base body,

a brush groove part for fixing the brush is formed on the brush base body step part,

the brush is fixed on the brush groove part,

the upper end of the brush is below the upper end of the brush slot portion.

5. The motor of claim 4,

the brush protrudes from the brush base body to the outside of the outer circumferential surface of the motor housing in the radial direction,

the upper end of the brush groove portion is disposed below the opening end portion of the motor case.

6. The motor of claim 1,

a space part inside the opening end of the motor housing is formed between the bracket and the driving magnet in the axial direction,

a brush base fixing through hole for fixing the brush base is formed in the holder,

a brush base fixing protrusion for insertion into the brush base fixing through hole is formed at an opening end portion of the brush base,

the brush base fixing protrusion is inserted into the brush base fixing through hole, protrudes toward the space inside the opening end of the motor housing, and is fixed to the brush base fixing through hole.

7. The motor of any one of claims 1 to 6,

a space part inside the opening end of the motor housing is formed between the bracket and the driving magnet,

a magnet supporting through hole for supporting the driving magnet is formed in the bracket,

a magnet supporting protrusion for inserting the magnet supporting through hole is formed at an opening end portion of the brush base,

the magnet supporting protrusion is inserted into the magnet supporting through hole, protrudes into the space inside the opening end of the motor case, and contacts the driving magnet.

Technical Field

The present invention relates to a small motor.

Background

As such a motor, for example, patent document 1 describes a blower fan driving motor including: a case body (motor case) formed of a steel plate or the like into a cylindrical shape; a rear end plate (brush base body) made of synthetic resin and engaged with an opening end portion on the rear end side of the housing main body; a brush fixed to the rear end plate; a metal front end plate fixed to the front end side of the case main body; a rotary drive shaft (rotary shaft) rotatably supported by bearings fixed to the rear end plate and the front end plate; a rotor having a coil (copper wire) fixed to the rotation driving shaft; and a permanent magnet stator (driving magnet) fixed to the inner peripheral surface of the housing main body and facing the outer peripheral surface of the rotor.

In this motor, a reinforcing ring (bracket) of a steel plate is pressed into the inner circumferential surface of the housing body from the rear end side of the housing body in proximity to the stator. Therefore, the motor is less likely to deform the portion of the housing to which the stator is fixed, through the reinforcing ring.

Disclosure of Invention

Problems to be solved by the invention

However, in the motor described in patent document 1, in order to make the housing main body portion to which the stator is fixed less likely to deform, the reinforcing ring is pushed in from the opening end portion on the rear end side of the housing main body to approach the stator, and an unnecessary space is enlarged between the reinforcing ring and the brush in the housing main body.

Accordingly, the present invention provides a motor that reduces unnecessary space for a reinforcing ring and a brush in a housing main body.

Means for solving the problems

The motor of the present invention comprises:

a motor housing having a cover cylindrical shape and having an open end;

a drive magnet fixed to an inner peripheral surface of the motor case;

a rotor having a copper wire, disposed to face an inner peripheral surface of the driving magnet;

a rotating shaft having a commutator and fixed to the rotor;

a hollow plate-shaped bracket having a through hole through which the rotating shaft passes;

the brush is connected with the commutator;

a bottomed cylindrical resin brush base body having an opening end portion; and

bearings fixed to the motor housing and the brush base body, respectively, for axially supporting the rotary shaft,

the bracket is fixed to an open end of the motor case,

the open end of the brush base is fixed to the bracket,

the brush base body has a brush base body space portion formed inside the bottomed tubular shape of the brush base body, the brush base body space portion communicating with the internal space portion of the motor housing via the through hole of the bracket,

the brush is fixed to the brush base body space.

Effects of the invention

Since the bracket of the motor of the present invention is fixed to the opening end of the motor case, the bracket can be disposed closer to the brush in the brush base body, and the motor case portion to which the driving magnet is fixed can be made less likely to deform without enlarging an unnecessary space between the bracket and the brush, as compared with the configuration of the conventional example.

Drawings

Fig. 1 is a sectional view of a finished motor according to a first embodiment of the present invention.

Fig. 2 is an assembled sectional view of the motor according to the first embodiment of the present invention.

Fig. 3 is an exploded perspective view of a motor according to a first embodiment of the present invention.

Fig. 4 is another exploded perspective view of the motor according to the first embodiment of the present invention.

Fig. 5 is a sectional view of a finished motor according to a second embodiment of the present invention.

Fig. 6 is a sectional view showing a modified example of the motor according to the second embodiment of the present invention.

Description of the reference numerals

1 Motor

10 Motor casing

10a motor case

10b inner peripheral surface of motor case

11 cylindrical part of motor housing

11a open end of motor housing

11b step part at the opening end of the motor case

11ba is located on the inner peripheral surface of the stepped portion of the opening end portion of the motor case

11c motor case open end inner space part

12 upper cover of motor casing

13 inner space part of motor casing

16 radial bearing

18 magnet for driving

20 rotor

21 armature core

22 copper wire

30 rotating shaft

31 commutator

40 bracket

40a outer peripheral surface of the bracket

40b lower surface of the bracket

41 through hole of bracket

42 through hole for supporting magnet on bracket

43 through hole for fixing brush base on bracket

50 brush base

50a brush base body outer peripheral surface

Cylindrical part of 51 brush base

51a brush base body

51b brush base step part

Inner bottom surface of step part of 51ba brush base

51c formed in the brush groove portion of the brush base step portion

51d magnet supporting projection formed at the opening end of brush base

51e formed on the opening end of the brush base

52 brush base bottom cover

53 Brush base space portion of Brush base

56 radial bearing

57 brush

57a end of brush

57b brush end (Power supply terminal)

100 motor

140 bracket

140a outer peripheral surface of the bracket

150 brush base

150a brush base body

200 motor

240 bracket

240a outer peripheral surface of the bracket

250 brush base body

250a brush base body outer peripheral surface

K riveting punch

Moving direction of KA riveting punch

Detailed Description

In the present description, in fig. 1 or 2, a direction parallel to the rotary shaft 30 of the motor is referred to as an "axial direction", a radial direction about the rotary shaft 30 is simply referred to as a "radial direction", and a rotational direction of the rotary shaft 30 is simply referred to as a "circumferential direction". In fig. 1 and 5, the upward direction is simply referred to as "up" and "upward", and the downward direction is simply referred to as "down" and "downward".

The vertical direction does not indicate a positional relationship or a direction when the device is incorporated into an actual apparatus.

Hereinafter, embodiments of the present invention will be described exemplarily based on the drawings.

(first embodiment example)

Fig. 1 to 4 are views for explaining the brush motor 1 of the present example. The motor 1 is a cored radial gap type motor.

The motor 1 includes a motor housing 10, a bracket 40, a driving magnet 18, a rotor 20, a rotary shaft 30, a commutator 31, a brush base 50, and a brush 57.

The motor case 10 is formed of a rigid magnetic iron material, and is formed in a covered cylindrical shape having a cylindrical portion 11 and an upper cover 12 integrally formed at an upper end of the cylindrical portion 11. A through hole is formed in the center of the upper cover 12, and the radial bearing 16 is press-fitted into the through hole. The motor case 10 has conductivity.

A motor housing step portion 11b having a slightly larger diameter than the inner peripheral surface 10b of the motor housing is formed on the entire inner peripheral surface of the motor housing near the opening end. A bracket 40 is fixed to the motor case stepped portion 11 b.

The bracket 40 is formed of a rigid magnetic iron material, and is formed in a thin hollow plate shape having a through hole 41 through which the rotary shaft 30 passes. The lower surface 40b of the bracket becomes a plane. The bracket 40 has conductivity.

The shape of the bracket 40 is a ring shape such that the outer diameter and the inner diameter are the same center.

The outer peripheral surface 40a of the bracket is formed to have the same size as the inner peripheral surface 11ba of the motor case step portion.

The axial height of the bracket 40 is slightly smaller than the axial height of the motor housing step portion 11 b.

When the bracket 40 is fixed to the motor case stepped portion 11b, the opening end portion 11a of the motor case slightly protrudes in the axial direction from the lower surface 40b of the bracket.

The driving magnet 18 has a cylindrical shape, and is formed of a cylindrical shape in which N poles and S poles are alternately magnetized in the circumferential direction. In the driving magnet 18, a cylindrical magnet is fixed to the inner peripheral surface 10b of the cylindrical portion of the motor case by an adhesive, or a rectangular rubber plastic is magnetically bent into a cylindrical shape.

The rotor 20 includes an armature core 21 formed by laminating a plurality of thin steel sheets , and a copper wire 22 spirally wound around the armature core 21.

The rotary shaft 30 has a commutator 31 and is fixed to the center of the armature core 21 of the rotor 20.

The commutator 31 is electrically connected to the copper wire 22.

The rotor 20 rotates integrally with the rotation shaft 30.

The brush base 50 is formed of a nonmagnetic hard resin material, is formed of a bottomed cylindrical shape having a cylindrical portion 51 and a bottom cover 52 integrally formed at the lower end of the cylindrical portion 51, and has a brush base space portion 53 formed inside the bottomed cylindrical shape.

A circular recess is formed in the center of the bottom cover 52 of the brush base, and the bottom surface of the recess serves as a thrust bearing. A radial bearing 56 is press-fitted into the recess.

The rotary shaft 30 is inserted through the radial bearing 16 fixed to the motor housing 10 and is rotatably supported. One end of the rotation shaft protrudes from the motor housing 10. The other end of the rotating shaft is supported by the radial bearing 56 fixed to the brush base body 50 and the thrust bearing described above.

The brush base 50 is fixed to the bracket 40. A flat surface is formed at an opening end 51a at the upper end of the cylindrical portion 51 of the brush base. The flat surface of the open end 51a of the brush base is directly in contact with and fixed to the flat surface of the lower surface 40b of the holder. The brush base 50 is in non-contact with the opening end 11a of the motor case.

When the brush base 50 is fixed to the bracket 40, the brush base space 53 communicates with the internal space 13 of the motor housing via the through hole 41 of the bracket. The internal space portion 13 of the motor case and the brush base space portion 53 are closed from the outside of the motor.

The outer peripheral surface 50a of the brush base is formed slightly smaller than the outer peripheral surface 40a of the holder.

In the brush base space 53, a pair of brushes 57 are provided so as to be in sliding contact with the commutator 31 and to flow a current. As shown in fig. 4, the pair of brushes 57 are disposed opposite to each other with the rotation shaft interposed therebetween inside the bracket 40.

The brush 57 is made of a rigid conductive material such as copper or a copper alloy, and is formed into a substantially thin flat plate shape having a flat surface and a side surface. The plane is broad relative to the side, which is narrow relative to the plane.

Next, a method of fixing the brush 57 will be described.

As shown in fig. 4, a brush base stepped portion 51b that is lowered one step below the opening end 51a of the brush base in the axial direction is formed at the opening end 51a of the brush base.

A brush groove portion 51c for fixing the brush 57 is formed in the brush base stepped portion 51b in the axial direction.

The upper end of the brush groove portion 51c is disposed axially below the opening end portion 11a of the motor case.

When the brush 57 is pressed into the brush groove portion 51c, the upper end of the brush is equal to or lower than the upper end of the brush groove portion 51 c.

Specifically, the brush 57 is press-fitted into the brush groove portion 51c by a not-shown brush press-fitting jig, and the brush press-fitting jig comes into contact with the inner bottom surface 51ba of the brush base stepped portion, thereby completing the brush press-fitting. In this example, the upper end of the brush 57 is the same as the upper end of the brush groove portion 51 c.

When the brush 57 is pressed into the brush groove portion 51c, the one end 57a of the brush is disposed at a position where it can come into contact with the commutator 31 fixed to the rotating shaft 30.

In addition, the brush 57 protrudes from the brush base 50 in the radial direction. The protruding portion of the brush 57 is disposed radially outward beyond the outer peripheral surface 10a of the motor case, and serves as the other end 57b of the brush and a power supply terminal for the motor from the outside. The power supply terminal 57b is formed to protrude in a radial direction of the motor, i.e., to protrude in a lateral direction, and one end 57a of the brush and the power supply terminal 57b are formed of the same member without a slit.

An open-end inner space 11c (see fig. 1) of the motor case is formed between the bracket 40 and the driving magnet 18 in the axial direction.

A brush base fixing through hole 43 for fixing the brush base 50 is formed in the bracket 40.

The brush base fixing through-holes 43 are formed at a plurality of locations with the same diameter at equal intervals in the circumferential direction around the rotation shaft 30.

A brush base fixing protrusion 51e inserted into the brush base fixing through hole 43 is formed at the opening end 51a of the brush base.

The brush base fixing protrusions 51e are formed with the same diameter at a plurality of locations at equal intervals in the circumferential direction around the rotation shaft 30.

The outer diameter of the brush base fixing protrusion 51e is slightly smaller than the inner diameter of the brush base fixing through hole 43.

The brush base fixing protrusion 51e is inserted through the brush base fixing through hole 43 and protrudes toward the inner space 11c of the opening end of the motor case. The brush base fixing protrusion 51e is fixed to the brush base fixing through hole 43 by, for example, being pressed by heat at the tip.

Further, a magnet support through hole 42 for supporting the drive magnet 18 is formed in the bracket 40.

The magnet support through-holes 42 are formed at equal intervals in the circumferential direction at a plurality of locations with the same diameter around the rotary shaft 30.

A magnet supporting protrusion 51d for insertion into the magnet supporting through hole 42 is formed at the opening end 51a of the brush base.

The magnet supporting protrusions 51d are formed with the same diameter at a plurality of locations at equal intervals in the circumferential direction around the rotation shaft 30.

The outer diameter of the magnet supporting protrusion 51d is slightly smaller than the inner diameter of the magnet supporting through hole 42.

When the magnet supporting protrusion 51d is inserted through the magnet supporting through hole 42, the magnet supporting protrusion 51d protrudes toward the inner space 11c of the opening end of the motor case and contacts the axial lower end of the driving magnet 18, thereby supporting the driving magnet 18 in the axial direction.

The magnet supporting projection 51d is formed higher than the brush base fixing projection 51e whose tip is flattened by heat.

The magnet support through-hole 42 is circumferentially displaced from the brush base body fixing through-hole 43, and is disposed at a position not overlapping when viewed in the axial direction.

The magnet supporting projection 51d is disposed at a position circumferentially displaced from the brush base fixing projection 51e and does not overlap when viewed in the axial direction.

As described above, the motor 1 of the present embodiment includes: a motor case 10 made of iron and having a cylindrical shape with a cover having an open end; a drive magnet 18 fixed to the inner peripheral surface of the motor case 10; a rotor 20 having a copper wire 22 disposed to face the inner peripheral surface of the driving magnet 18; a rotating shaft 30 having a commutator 31 fixed to the rotor 20; a hollow plate-shaped bracket 40 having a through hole through which the rotary shaft 30 passes; a brush 57 connected to the commutator; a bottomed cylindrical resin brush base 50 having an open end; and bearings 16 and 56 fixed to the motor housing 10 and the brush base 50, respectively, and supporting the rotary shaft 30.

The bracket 40 is fixed to a step portion 11b, and the step portion 11b is formed at an opening end portion 11a of the motor case.

The open end 51a of the brush base body is fixed to the bracket 40 from the outside of the motor housing 10.

The brush base body 50 has a brush base body space 53 formed inside the brush base body in a bottomed cylindrical shape, and the brush base body space 53 communicates with the internal space 13 of the motor housing via the through hole 41 of the bracket.

A brush 57 is fixed to the brush base space 53.

Thus, the bracket of the motor of the present example is fixed to the opening end portion of the motor case, and therefore, compared with the configuration of the conventional example, the bracket can be disposed close to the brush in the motor case, an unnecessary space between the bracket and the brush is not enlarged, and the motor case portion to which the driving magnet is fixed can be made less likely to deform.

Further, since a steel plate or the like is formed in a cylindrical shape in a case body of a motor as in the conventional example, it is difficult to process the steel plate or the like having a large plate thickness into a cylindrical shape, and the steel plate or the like has to be formed in a thin wall. Therefore, it is difficult for the rear end plate made of synthetic resin to obtain a large contact area in the radial direction with the opening end portion located on the rear end side of the case main body, and it is difficult to improve the fixing strength by engagement between the case main body and the rear end plate.

On the other hand, since the brush base body of this example is fixed to the hollow plate-shaped holder, the contact area with the holder in the radial direction can be increased as necessary by the resin brush base body. This makes it easy to improve the fixing strength between the brush base and the holder.

Further, a motor case stepped portion 11b having a larger diameter than the inner peripheral surface 10b of the motor case is formed on the inner peripheral surface of the opening end portion 11a of the motor case.

The outer peripheral surface 40a of the bracket is formed to be the same as the inner peripheral surface 11ba of the motor case step portion.

The outer peripheral surface 40a of the bracket is in contact with the inner peripheral surface 11ba of the stepped portion of the motor housing.

The outer peripheral surface 50a of the brush base is formed slightly smaller than the outer peripheral surface 40a of the holder.

The outer peripheral surface 40a of the bracket is caulked to the opening end 11a of the motor case, and the bracket 40 is fixed to the opening end 11a of the motor case.

Thereby, the bracket is easily caulked to the motor case.

That is, when the bracket 40 is fixed to the motor case 10, the outer peripheral surface of the brush base is formed slightly smaller than the outer peripheral surface of the bracket, and therefore, the caulking punch K having an inclined tip shown in fig. 2 moves from the axial direction (specifically, the moving direction KA of the caulking punch in fig. 2), the outer peripheral surface of the bracket is caulked to the opening end portion of the motor case, and the bracket is easily caulked to the motor case.

On the other hand, if the outer peripheral surface 50a of the brush base is formed larger than the outer peripheral surface 40a of the holder, the opening end of the motor case cannot be swaged inward when the swaging punch K having an inclined tip shown in fig. 2 moves in the axial direction.

As described above, in the case where the bracket 40 of the present embodiment is caulked to the motor case 11 by the caulking punch K moved from the axial direction, the bracket 40 is easily caulked to the motor case 11.

The brush 57 has a flat plate shape and protrudes radially outward from the brush base 50 to the outer peripheral surface 10a of the motor housing.

The upper end of the brush 57 is disposed below the opening end 11a of the motor case.

That is, the brush is disposed at the opening end portion 11a of the motor housing with a space therebetween in the axial direction.

Thus, the bracket of the motor of the present example can be disposed close to the brush in the motor case, the unnecessary space between the bracket and the brush is not enlarged, and the power supply terminal is laterally protruded, and the space is formed between the brush and the opening end of the motor case, so that the conductive brush does not come into electrical contact with the conductive motor case, and the brush can be electrically insulated from the motor case.

The bracket 40 is made of iron.

A brush base stepped portion 51b that descends downward is formed at the opening end portion 51a of the brush base.

A brush groove 51c for fixing the brush 57 is formed in the brush base stepped portion 51 b.

The brush 57 is fixed to the brush groove portion 51 c.

The upper end of the brush 57 is equal to or lower than the upper end of the brush groove portion 51 c.

Since the bracket has magnetism, this example can improve the magnetic characteristics of the magnetic circuit between the drive magnet and the rotor, as compared with the case where the bracket is nonmagnetic.

In addition, the conductive brush does not electrically contact the conductive bracket, and the brush can be electrically insulated from the bracket.

That is, if a brush groove portion for fixing the brush is formed at the opening end portion of the brush base and the brush is fixed to the brush groove portion, the conductive brush may be in electrical contact with the conductive bracket and the brush may not be electrically insulated from the bracket in a case where the upper end of the brush is equal to or lower than the upper end of the brush groove portion.

On the other hand, in this example, a brush base stepped portion that descends downward is formed at the opening end portion of the brush base, and a brush groove portion that fixes the brush is formed at the brush base stepped portion. If the brush is fixed to the brush groove portion, the upper end of the brush is disposed below the upper end of the brush groove.

Therefore, a space is formed between the lower surface of the bracket and the brush, the conductive brush does not electrically contact the conductive bracket, and the brush can be electrically insulated from the bracket.

The brush 57 has a flat plate shape and protrudes radially outward from the brush base 50 to the outer peripheral surface 10a of the motor housing.

The upper end of the brush groove portion 51c is disposed below the opening end portion 11a of the motor case.

Thus, a space is formed between the opening end of the motor case and the brush, the conductive brush does not electrically contact the conductive motor case, and the brush can be electrically insulated from the motor case.

Further, an open-end inner space portion 11c of the motor case is formed between the bracket 40 and the driving magnet 18 in the axial direction.

A brush base fixing through hole 43 for fixing the brush base 50 is formed in the bracket 40.

A brush base fixing protrusion 51e for inserting the brush base fixing through hole 43 is formed at the opening end 51a of the brush base.

When inserted through the brush base fixing through-hole 43, the brush base fixing protrusion 51e protrudes toward the inner space 11c of the opening end of the motor case and is fixed to the brush base fixing through-hole 43.

Thus, the brush base can be reliably fixed to the bracket.

Further, an open-end inner space portion 11c of the motor case is formed between the bracket 40 and the driving magnet 18.

The bracket 40 is formed with a magnet support through-hole 42 for supporting the drive magnet 18.

A magnet supporting protrusion 51d for insertion into the magnet supporting through hole 42 is formed at the opening end 51a of the brush base.

The magnet supporting protrusion 51d protrudes toward the space 11c inside the opening end of the motor case and contacts the driving magnet 18 when inserted through the magnet supporting through hole 42.

Thus, in this example, the drive magnet can be supported so as not to move further in the axial direction in the motor case without providing any other member.

The driving magnet 18 has a cylindrical shape.

The magnet supporting projection 51d is formed to be higher than the brush base fixing projection 51e after the heat welding.

Thus, the magnet supporting projection can reliably support the driving magnet.

(second embodiment example)

Next, a structure of a motor 100 according to a second embodiment of the present invention will be described with reference to fig. 5.

In fig. 5, the same components as those in fig. 1 to 4 are given the same reference numerals, and the description thereof is omitted.

In the second embodiment, the method of fixing the motor housing 10 to the bracket 40 is different from that of the first embodiment. That is, in the first embodiment, since the opening end 11a of the motor housing is caulked to the outer peripheral surface 40a of the bracket, the outer peripheral surface 50a of the brush base is slightly smaller than the outer peripheral surface 40a of the bracket, and the outer peripheral surface 40a of the bracket is slightly smaller than the outer peripheral surface 10a of the motor housing.

On the other hand, in the second embodiment, the outer peripheral surface 10a of the motor housing, the outer peripheral surface 140a of the bracket, and the outer peripheral surface 150a of the brush base body are formed to have the same size, and the opening end of the motor housing and the outer peripheral surface of the bracket are welded and fixed.

In the second embodiment, the unnecessary space between the bracket and the brush can be prevented from being enlarged, the motor case portion to which the driving magnet is fixed can be made less likely to be deformed, and the outer peripheral surface of the motor case, the outer peripheral surface of the bracket, and the outer peripheral surface of the brush base body have the same size, so that the mountability to the mounting device to which the motor is mounted can be improved.

While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

In the above description of the embodiment, the brackets 40 and 140 are made of an iron material having a rigid magnetic body, but the present invention is not limited thereto. For example, the bracket may be formed of a rigid resin material having magnetic properties.

For example, the bracket may be made of a rigid, nonmagnetic iron material or a rigid, nonmagnetic resin material. In this case, although the magnetic path between the driving magnet and the rotor is slightly lowered, the above-described operational effects can be obtained.

In the above description of the embodiment, the holder 40, 140 is formed with the brush base fixing through hole 43 and the magnet supporting through hole 42, and the brush base 50, 150 is formed with the brush base fixing protrusion 51e and the magnet supporting protrusion 51d, but the present invention is not limited thereto.

For example, only the brush base fixing through-hole may be formed in the holder, only the brush base fixing protrusion may be formed in the brush base, and the brush base fixing protrusion and the brush base fixing through-hole may be combined.

For example, only the magnet supporting through-hole may be formed in the bracket, only the magnet supporting through-hole may be formed in the brush base, and the magnet supporting through-hole and the magnet supporting protrusion may be combined. In this case, an adhesive or the like is used for fixing the holder to the brush base.

In the above description of the embodiment, the brush 57 protrudes from the brush base 50 in the radial direction to form the power supply terminal protruding in the lateral direction, but the power supply terminal is not limited to this form.

For example, the power supply terminal may be modified in shape so as to protrude from the brush base in the longitudinal direction in which the power supply terminal protrudes downward in the axial direction of the motor, instead of protruding in the lateral direction.

In the above description of the embodiment, the brush base stepped portion 51b that descends downward is formed at the opening end portion 51a of the brush base, the brush groove portion 51c that fixes the brush 57 is formed at the brush base stepped portion 51b, the brush 57 is fixed to the brush groove portion 51c, and the upper end of the brush is not more than the upper end of the brush groove 51c, but the present invention is not limited thereto.

For example, the brush groove portion may be formed directly on the plane of the opening end of the brush base without forming the brush base stepped portion. In this case, when the brush is fixed to the brush groove portion, the upper end of the brush is arranged at a position not reaching the upper end of the brush groove. That is, the brush is pressed deeper into the brush groove portion. In this case, the conductive brush is not in electrical contact with the conductive holder, and the brush can be electrically insulated from the brush base.

In the above description of the embodiment, the driving magnet 18 has a cylindrical shape, but the present invention is not limited to this. The driving magnet 18 may be a divided shape in which a plurality of predetermined gaps are provided in the circumferential direction.

In the second embodiment, the outer peripheral surface 10a of the motor housing, the outer peripheral surface 40a of the bracket, and the outer peripheral surface 50a of the brush base body have the same size, but the present invention is not limited thereto.

For example, as in the motor 200 shown in fig. 6, the outer peripheral surface 240a of the bracket and the outer peripheral surface 250a of the brush base may be slightly larger than the outer peripheral surface 10a of the motor housing (first modification). In this case, the outer peripheral surface 240a of the bracket is the same size as the outer peripheral surface 250a of the brush base.