JP2003079109A - Brush holder and electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brush holder which can be standardized for use irrespective of the existence of a choke coil. SOLUTION: This brush holder 8 is formed integrating its holder body 17 with a power supply portion 15 and a uniting portion 18. Inside the engaging recess 15a of the power supply portion 15, power terminals 16 are formed exposed. The bottom portion 17d of the holder body 17 is equipped with connector terminals which continue from the power terminals 16 via the medium of the uniting portion 18, and brush-housing portions 17e and housing portions 20 are formed. The housing portions 20 are provided with wall portions 20a and elastic pieces 20b, and protrusions 20c are formed in the wall portions 20a. Holes are formed in the bottom parts of the housing portions 20, and parts of the connector terminals are exposed by the holes and form exposed portions 19a. In the exposed portions 19a, the holes are formed. The housing portions 20 are formed so as to be able to house choke coils 23 or terminal boards 29 connected to brushes 7 via pigtails 7a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush holder attached to an electric motor and an electric motor.

[0002]

2. Description of the Related Art Generally, in an electric motor, electric noise is generated by sliding contact between a brush and a commutator. Therefore, when an electronic device is arranged around the motor, the electronic device may be adversely affected. Therefore, there has been a device that suppresses the generation of electric noise by assembling an electric element such as a choke coil or a capacitor with the brush holder.

[0003]

However, in order to arrange electric elements such as a choke coil and a capacitor, a structural component separate from the brush holder is provided, or
It was necessary to secure a space for arrangement in the brush holder, and a brush holder in which electric elements could be arranged had to be specially designed. Further, even for a motor that does not require an electric element, a brush holder that does not have an electric element must be specially designed. That is, since the brush holder is designed according to the presence or absence of the electric element, the design is complicated.

The present invention has been made in view of the above circumstances, and a first object thereof is to provide a brush holder which can be standardized and used regardless of the presence or absence of a choke coil. The second purpose is to provide an electric motor having the brush holder.

[0005]

In order to achieve the first object, in the invention according to claim 1, a holder main body having a brush accommodating portion for slidably holding the brush toward the commutator, A brush holder made of resin integrally formed with a power feeding unit for holding a power feeding terminal for feeding power to the brush, wherein the brush holder can accommodate a conductive member connected to the brush via a lead wire. A terminal continuously formed from the power feeding section is insert-molded while the accommodation section is formed, a part of the terminal is exposed in the accommodation section, and the brush is exposed in the accommodation section. It can be energized through the conductive member that engages with a part of the terminal.

According to the present invention, when the conductive member connected to the brush via the lead wire is accommodated in the accommodating portion, the conductive member is insert-molded so as to be continuous from the power feeding portion, and the accommodating portion is accommodated. The part of the terminal exposed at the position is engaged, and the brush can be supplied with power. Therefore, even if the type of the conductive member is changed, the energization path is secured, and the structure of the brush holder is simplified.

According to a second aspect of the present invention, in the first aspect of the invention, the accommodating portion is formed along the axial direction of the rotary shaft that is inserted into the commutator. According to the present invention, since the accommodating portion is formed along the axial direction of the rotary shaft, even if the holding space for the electrical component is small in the radial direction of the brush holder, the conductive member having a long length can be attached to the rotary shaft. Can be arranged along the axial direction of.
Therefore, the conductive member is securely held in the accommodating portion.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the holding portion is formed with a holding portion that holds the conductive member and that protrudes inward.

According to the present invention, the conductive member is held in the housing portion by the holding portion. Therefore, even if the pulling load when shaping the lead wire so as to be on the side opposite to the commutator in order to prevent the lead wire from contacting the commutator, even if the conductive member acts on the conductive member via the lead wire, Securely held in.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the conductive member is a choke coil. According to the present invention, radio noise is surely reduced.

According to a fifth aspect of the present invention, in the invention according to any one of the first to third aspects, the conductive member is a terminal plate and is press-fitted and fixed to the accommodating portion.

According to the present invention, the terminal plate is press-fitted and fixed in the accommodating portion, so that the terminal plate is securely held by simple assembly. In order to achieve the second object, the invention according to claim 6 includes the brush holder according to any one of claims 1 to 5. According to this invention, the same effects as those of the invention described in any one of claims 1 to 5 can be obtained.

According to a seventh aspect of the invention, in the invention of the sixth aspect, the brush holder is sandwiched and held between the gear housing and the motor housing. According to the present invention, since the brush holder is sandwiched and held between the gear housing and the motor housing, the brush holder can be easily held even when the brush holder does not fit in the yoke housing side.

According to an eighth aspect of the invention, in the seventh aspect of the invention, the conductive member is accommodated in a state of intersecting a contact surface between the gear housing and the motor housing.

According to the present invention, since the conductive member is arranged on both sides of the gear housing side and the motor housing side with respect to the contact surface, the conductive member having a sufficient size can be used even if the motor housing is downsized. Can be placed inside.

According to a ninth aspect of the invention, in the seventh or eighth aspect of the invention, the terminal is exposed from the bottom of the accommodating portion. According to the present invention, the conductive member is simply attached along the forming direction of the accommodating portion,
Easy to connect.

In a tenth aspect of the invention, a holder main body having a brush accommodating portion for slidably holding the brush toward the commutator and a power feeding portion for holding a power feeding terminal for feeding the brush are integrally formed. An electric motor having a resin brush holder sandwiched and held between a gear housing and a motor housing, wherein the brush holder accommodates a conductive member connected to the brush via a lead wire. A possible accommodating portion is formed, a terminal continuously formed from the power feeding portion is insert-molded, a part of the terminal is exposed in the accommodating portion, and the brush is exposed in the accommodating portion. Further, the accommodating portion that is configured to be energizable via the conductive member that engages with a part of the terminal and that is integrally molded with the brush holder is It is formed so as to intersect the plane containing the clamped portion of a plane perpendicular to the rotating shaft holding formed in the brush holder.

According to the present invention, the conductive member is arranged on both sides of the gear housing side and the motor housing side with respect to the sandwiched portion. Therefore, even if the motor housing is downsized, the conductive member having a sufficient size can be used. Can be placed inside.

According to the invention of claim 11, claims 7 to
11. The invention according to claim 10, wherein the opening and the bottom of the accommodating portion are arranged in an axial direction of a rotating shaft of the electric motor with respect to a held portion for holding formed on the brush holder. It is located on both sides.

According to the present invention, when the conductive member is attached along the forming direction of the accommodating portion, the conductive member is arranged on both sides of the gear housing side and the motor housing side with respect to the sandwiched portion, so that the size is sufficiently large. A conductive member such as a choke coil can be positioned and held in the motor and held.

According to the twelfth aspect of the invention, the sixth to sixth aspects are provided.
In the invention according to any one of claims 8 and 10, the accommodation portion is a through hole. According to the present invention, since the conductive member is attached to the brush holder while penetrating the accommodating portion, it is possible to easily increase the size of the conductive member such as the choke coil.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. In addition, FIG.
Is a schematic front view of a state in which a part of the motor is broken,
FIG. 3B is a schematic side view showing a state where the power feeding portion of the motor is viewed from the right side in FIG.

As shown in FIG. 3A, the motor unit 2 as a drive source of the motor 1 with a reduction mechanism has a yoke housing 3 as a motor housing made of a metal material, and a rotor 5 having a rotary shaft 4. , Magnet 6 and brush 7
And a brush holder 8 for supporting.

The yoke housing 3 is formed into a substantially flat cylindrical shape with a bottom, and a bearing 9 is fixed to the bottom 3a thereof, and the bearing 9 rotatably supports the base end of the rotary shaft 4.
A gear housing 10 made of a resin material is attached to the opening of the yoke housing 3 with a screw 11 so as to cover the rotary shaft 4 protruding from the opening. In FIG. 3, the contact surface S between the yoke housing 3 and the gear housing 10 is shown.
1 is shown.

The gear housing 10 is formed in a predetermined shape capable of accommodating a part of the rotary shaft 4 arranged therein, the worm wheel 12, and the like. Gear housing 10
Two bearings 13 and 14 are fixed inside the bearings 13 and 1
4 rotatably supports a central portion and a tip portion of the rotary shaft 4. A worm 4 a is formed between the bearings 13 and 14 of the rotary shaft 4, and the worm 4 a and the worm wheel 12 are formed.
By engaging with and, the rotational force is transmitted in the direction orthogonal to the rotating shaft 4.

The opening portion of the yoke housing 3 and the fixing portion 10 of the gear housing 10 for fixing the yoke housing 3
A brush holder 8 is interposed between the brush holder 8 and a. Next, the brush holder 8 will be described. Note that FIG.
3A and 3B are plan views of the brush holder, and FIG.
The motor shown in (a) corresponds to the state viewed from the right side in FIG. Further, FIG. 1A shows a state where the brush holder accommodates the terminal plate, and FIG. 1B shows a state where the brush holder accommodates the choke coil.
Further, a fitting recess 15a described later is configured such that the yoke housing 3 side is opened in the configuration of FIG. 1A and the gear housing 10 side is opened in the configuration of FIG. 1B.

As shown in FIGS. 1A and 1B, the brush holder 8 is provided with a holder body 17, a power feeding portion 15, and a connecting portion 18 for connecting the holder body 17 and the power feeding portion 15. It is integrally formed of resin.

The outer shape of the holder body 17 is formed in a shape including a pair of straight line portions 17a parallel to each other and a pair of arcuate portions 17b connecting both ends of the straight line portion 17a, and abuts the opening of the yoke housing 3. Is configured. The connecting portion 18 is formed so as to connect the one arc portion 17b of the holder body 17 and the power feeding portion 15, and the power feeding portion 15 projects to the outside of the gear housing 10 as shown in FIG. Is formed.

A fitting recess 15a for connecting to an external connector (not shown) is provided in the power feeding portion 15 in parallel with the axial direction of the rotary shaft 4 as shown in FIG. As shown in FIGS. 1A and 3B, a power supply terminal 16 as a power supply terminal is insert-molded therein so as to be exposed.

As shown in FIGS. 1 (a), 1 (b) and FIGS. 7 (a), 7 (b), the holder main body 17 has an outer shape that fits inside the opening of the yoke housing 3. An annular fitting portion 17c formed to have substantially the same shape and a bottom surface portion 17d orthogonal to the fitting portion 17c are formed.
The bottom portion 17d of the holder body 17 has a structure shown in FIGS.
As shown in (a), from the power supply terminal 16 of the power feeding unit 15,
A connector terminal 19 as a terminal that is continuous via the connecting portion 18 is insert-molded.

As shown in FIG.
As shown in (b), two brush accommodating portions 17e are provided so as to face each other while extending in the longitudinal direction of the holder body 17. On both sides of the holder main body 17 in the width direction, a capacitor housing portion 17g and a circuit breaker housing a capacitor 21 and a circuit breaker 25 (illustrated in FIGS. 1A and 1B) connected to a circuit board (not shown), respectively. 17h of accommodation parts are provided in the position which opposes. Near both ends of the circuit breaker housing 17h,
The accommodating portions 20 each having a substantially bottomed cylindrical shape are formed, and the fixing portions 28 that fix the springs 27 are formed near both ends of the capacitor accommodating portion 17g.

As shown in FIGS. 2 (a) and 2 (b), near the center of the brush holder 8 in the height direction (axial direction of the rotary shaft 4), there is a flange shape protruding in the radial direction of the rotary shaft 4. A clamped portion 8a for holding is formed. Clipped part 8a
Is covered with a seal member 8b such as rubber.

The sandwiched portion 8a covered by the seal member 8b is sandwiched between the fixed portion 10a of the gear housing 10 and the abutting portion 3b of the yoke housing 3. The sandwiched portion 8a is sandwiched in this way and is held by the brush holder. 8 is retained.

In the fixed portion 10a of the gear housing 10,
An accommodating recess 10b for accommodating the sandwiched portion 8a covered by the seal member 8b is formed at a position corresponding to the linear portion 17a of the holder body 17.

At the portion corresponding to the linear portion 17a of the holder main body 17, the sandwiched portion 8 covered with the seal member 8b.
a is accommodated in the accommodation recess 10b, the fixing portion 10a
And the contact portion 3b. Seal member 8b
As a result, the held portion 8a and the contact portion 3 of the yoke housing 3 are
b and the clamped portion 8a and the fixed portion 10a of the gear housing 10 are sealed and waterproofed. The sandwiched portion 8a and the seal member 8b are located on the bottom surface portion 1 from the contact surface S1.
It is located on the 7d side. Further, at the location corresponding to the circular arc portion 17b of the holder main body 17, the held portion 8a covered by the seal member 8b is housed in the gear housing 10.

As shown in FIGS. 1A and 1B and FIGS. 2A and 2B, the accommodating portion 20 includes a wall portion 20a having an arcuate inner surface and an elastic piece 20b. As shown in FIGS. 2 (b) and 7 (b), two convex portions 20c forming a holding portion of the conductive member are formed on the inner surface of the portion 20a so as to extend along the longitudinal direction thereof. . As shown in FIGS. 2A and 2B and FIGS. 6 and 7B, a hole 20d is formed in the bottom of the housing portion 20, and the connector terminal 19
Is an exposed portion 19a, a part of which is exposed in the hole 20d.
Therefore, a hole 19b is formed in the exposed portion 19a. That is, the hole 20d and the hole 19b are configured to communicate with each other. As shown in FIGS. 1A and 1B, the accommodating portion 20 is configured to accommodate the terminal plate 29 and the choke coil 23. The elastic piece 20b and the convex portion 2
The holding portion is constituted by 0c.

The brush 7 is formed in a substantially rectangular parallelepiped shape and is shown in FIG.
As shown in (a) and (b), in a state of being accommodated in the brush accommodating portion 17e, the spring 27 urges the commutator 5a side to supply electric power via the pigtail 7a as a lead wire. ing.

As shown in FIG. 4, the terminal plate 29 as a conductive member is bent into a substantially crank shape so that both ends near the center of the terminal plate 29 in the longitudinal direction are flush with each other in the same plane. , Substantially rectangular press-fitting portion 29a
Is provided. The width of the terminal plate 29 is formed to have a predetermined width so that the terminal plate 29 can be press-fitted and fixed to the housing portion 20 via the press-fitting portion 29a. A connection portion 29b is provided at one end of the terminal plate 29, and the connection portion 29b
b is a connector terminal 1 as shown in FIG.
It is configured so as to be soldered and fixed to the exposed portions 19a of each of the nine. As shown in FIG. 5, the other end of the terminal plate 29 is connected to one end of the pigtail 7a, and the other end of the pigtail 7a is connected to the brush 7.

The choke coil 2 as a conductive member
As shown in FIGS. 1 (b) and 2 (b), 3 is formed in a cylindrical shape with a core 23a inserted and fixed in the center.
One end of the choke coil 23 is configured to be soldered and fixed to the exposed portion 19a. The other end of the choke coil 23 is connected to one end of the pigtail 7a,
The other end of the pigtail 7a is connected to the brush 7.

Choke coil 23 and capacitor 21
Constitutes a noise prevention circuit for preventing the generation of electromagnetic noise between the brush 7 and the commutator 5a. The noise prevention circuit is provided between the brush 7 and a power supply terminal 16 that supplies power to the brush 7.

The accommodating portion 20 which is continuously formed integrally with the holder body 17 is formed so as to extend in the axial direction of the rotary shaft 4. The accommodating portion 20 is a surface orthogonal to the rotating shaft 4 of the motor 1 and is the sandwiched portion 8 formed in the brush holder 8.
It is formed so as to intersect the surface (formation surface) S2 including a. Therefore, the conductive member (the choke coil 23, the terminal plate 29) is held in the housing portion 20 while intersecting the formation surface S2. In addition, the forming surface S2
Is parallel to the contact surface S1.

The opening of the housing portion 20 and the hole 20d through which the exposed portion 19a of the connector terminal 19 is exposed are
It is arranged at both ends in the axial direction of the rotating shaft 4 around the sandwiched portion 8a. Therefore, the hole 20d through which the exposed portion 19a of the connector terminal 19 is exposed is arranged at the bottom of the accommodating portion 20, so that the connector terminal 19 can be accommodated only by accommodating the conductive member along the forming direction (longitudinal direction) of the accommodating portion 20.
Can be easily connected with.

Next, the operation of mounting the conductive member on the brush holder 8 having the above structure will be described. When the terminal plate 29 as the conductive member is housed in the housing part 20, as shown in FIG. 2A, the terminal plate 29 to which the brush 7 and the pigtail 7a are connected is the press-fitting part 29.
A is press-fitted and fixed to the inner wall surface of the housing portion 20, and the connection portion 29b is inserted into the hole 20d and the hole 19b. Then, the connecting portion 29b and the exposed portion 19a are fixed by soldering, and the brush 7 is accommodated in the brush accommodating portion 17e to be in the state shown in FIG. 1 (a).

It should be noted that the terminal plate 29 has the press-fitting portion 29a.
Thus, the holding force in the state of being press-fitted and fixed in the housing portion 20 prevents contact between the pigtail 7a and the commutator 5a, so that the holding force against the tensile load when shaping the pigtail 7a to the side opposite to the commutator 5a side. The size of the terminal plate 29 is set so as not to come off from the accommodating portion 20.

Also, the choke coil 2 as a conductive member
2 is accommodated in the accommodating portion 20, the choke coil 23 is urged toward the wall portion 20a by the urging force of the elastic piece 20b, as shown in FIG. Concavities and convexities on the outer peripheral surface of the are locked to the protrusions 20c. Then, one end of the choke coil 23 has holes 20d and 19
b, one end of the choke coil 23 and the exposed portion 1 are inserted.
9a and 9a are fixed by soldering, and the brush 7 is accommodated in the brush accommodating portion 17e to be in the state shown in FIG. 1 (b).

The choke coil 23 is replaced by the elastic piece 20.
The holding force in the state of being locked in the accommodating portion 20 by the b and the convex portion 20c is set to a size such that the choke coil 23 does not come off from the accommodating portion 20 against the tensile load when shaping the pigtail 7a. ing.

Therefore, either the terminal plate 29 or the choke coil 23 can be accommodated in the accommodating portion 20. Next, the brush holder 8 having the above configuration
The motor 1 using is described.

When a terminal plate 29 is used as a conductive member when manufacturing a motor using the brush holder 8 of the present embodiment, the terminal plate 29 is housed in the housing portion 20. When the choke coil 23 is used as the conductive member, the choke coil 23 is housed in the housing portion 20. The brush holder 8 accommodating the terminal plate 29 or the choke coil 23 is interposed between the opening of the yoke housing 3 and the fixed portion 10a of the gear housing 10 with the rotary shaft 4 inserted therethrough. . At that time, the fitting portion 17c of the holder main body 17 is internally fitted in the opening portion, and the opening portion and the fixing portion 10a are fixed by the screw 11 to complete the motor 1 shown in FIG.

This embodiment has the following effects. (1) Since the housing portion 20 is formed so that the choke coil 23 or the terminal plate 29 can be housed regardless of which conductive member is used, power is supplied to the brush 7 regardless of the presence or absence of the choke coil 23. be able to. Therefore, even if the type of the conductive member is changed, the energization path can be secured, and the structure of the brush holder 8 can be simplified. Further, since the structure of the brush holder 8 is simplified, the motor 1 including the brush holder 8 can be manufactured as well.
It will be easy.

(2) Since the accommodating portion 20 is formed along the axial direction of the rotary shaft 4, even if the holding space for the electrical components is small in the radial direction of the brush holder 8, the conductive material having a long length is used. The member can be housed. Therefore, the conductive member can be securely held in the housing portion 20.

(3) Since the elastic piece 20b and the convex portion 20c are formed in the accommodating portion 20, even if the tensile load when shaping the pigtail 7a acts on the choke coil 23 via the pigtail 7a, the choke coil 23 is choked. Coil 23
Can be reliably held in the housing portion 20.

(4) When the choke coil 23 is accommodated in the accommodating portion 20 and is used as a motor, the choke coil 23 and the capacitor 21 constitute a noise prevention circuit to reliably reduce the radio noise. it can.

(5) The press-fitting portion 29a is attached to the terminal plate 29.
By forming the above, it can be easily press-fitted and fixed to the inner wall surface of the housing portion 20. Therefore, the terminal plate 29 can be securely held in the housing portion 20 with a simple assembly.

(6) Since the convex portion 20c is formed so as to extend along the inner surface of the wall portion 20a, the holder body 17
Die cutting is easy when molding. (7) Since the brush holder 8 is sandwiched and held between the yoke housing 3 and the gear housing 10,
Even if the brush holder 8 does not fit all over the yoke housing side, the brush holder 8 can be easily held.

(8) The conductive member (the choke coil 23, the terminal plate 29) is accommodated in the accommodating portion 20 in a state intersecting the contact surface S1 between the gear housing 10 and the yoke housing 3, so that the conductive member is abutted. It is arranged on both sides of the gear housing side and the motor housing side with respect to the contact surface S1. Therefore, even if the yoke housing 3 is downsized, a sufficiently large conductive member can be arranged in the motor.

(9) The opening and the bottom of the accommodating portion 20 are arranged on both sides in the axial direction of the rotary shaft 4 of the motor 1 with respect to the held portion 8a for holding formed on the brush holder 8. Therefore, a conductive member such as a choke coil having a sufficient size can be positioned and arranged and held in the motor.

The embodiment is not limited to the above, but may be modified as follows. The shape of the press-fitting portion 29a of the terminal plate 29 may be changed to a substantially triangular projection 29c as shown in FIG.
In this case, after the terminal plate 29 is press-fitted into the housing portion 20 with the same pressure input, when a force acts in the direction of pulling out the terminal plate 29 from the housing portion 20, the inner wall surface of the housing portion 20 with the protrusion 29c bent. The terminal plate 29 can be made difficult to come off by abutting against. The number of the protrusions 29c is not limited to two and may be one or three or more.

The press-fitting portion of the terminal plate is not limited to the above-described press-fitting portion 29a and the protrusion 29c, but may be formed so as to be deformable inside the terminal plate.
For example, as shown in FIG. 9A, the press-fitting portion 31 is formed as an elastic protrusion that extends obliquely outward toward the opposite side of the connecting portion 29b in the terminal plate, and a gap 32 is formed inside the press-fitting portion 31 in the terminal plate. To provide. The width of the press-fitting portion 31 and the width W of the gap 32 are substantially the same. The press-fitting portion 31 can bend inside the terminal plate by the amount of the gap 32.

Since the terminal plate is accommodated in the accommodating portion 20, the value obtained by stacking the dimensional tolerance of the terminal plate and the dimensional tolerance of the accommodating portion 20 on the other side is the dimensional tolerance of the press-fitting margin. Since the tolerance width of the press-fitting margin is wide as described above, at the lower limit thereof, even if the terminal plate is inserted into the accommodating portion 20, the terminal plate is less likely to be press-fitted, and the terminal plate may easily vibrate in the accommodating portion 20. Further, when the tolerance width of the press-fitting margin is the upper limit, it may be difficult to insert the terminal plate into the housing portion 20, and it may be difficult to insert the terminal plate.

However, in the structure in which the press-fitting portion 31 and the gap 32 are provided, the press-fitting portion 31 has the gap 32 even if the protrusion amount of the press-fitting portion 31 in the width direction of the terminal plate is larger than that of the press-fitting portion 29a or the protrusion 29c. As a result, the width of the terminal plate at the press-fitting portion becomes narrower than that in the case where the press-fitting portion 29a and the like are provided. Therefore, the press-fitting portion 31 is formed large so that the terminal plate is press-fitted into the housing portion 20 even at the lower limit of the tolerance width of the press-fitting margin. Since there is the gap 32, even if the tolerance width of the press-fitting margin is the upper limit, the press-fitting portion 31 can be bent to the inside of the terminal plate by the gap 32, so that the terminal plate can be accommodated without being tight. Can be inserted into 20. Therefore, the terminal plate can be formed so as to correspond to the wide tolerance width of the press-fitting margin.

Further, since the press-fitting portion 31 extends obliquely outward toward the side opposite to the connecting portion 29b, the width of the terminal plate in the press-fitting portion 31 becomes narrower in the press-fitting direction, that is, toward the connecting portion 29b side. , Terminal board accommodating part 20
It is easy to insert into.

The gap 32 has a width W of, for example, 0.
Form to 5 mm. The width W of the gap 32 is not limited to being formed to 0.5 mm and may be formed to another value.

The structure for making the press-fitting portion deformable inside the terminal plate is not limited to the structure shown in FIG. 9 (a). For example,
A punching part is formed inside the terminal plate so as to allow the press-fitting part to bend inside the terminal plate. And
The press-fitting portion may be formed large so that the terminal plate is press-fitted into the housing portion 20 even at the lower limit of the tolerance width of the press-fitting margin.

For example, as shown in FIG. 9B, a pair of press-fitting portions 34 are formed on both side portions of the terminal plate, and a punching portion 35 is formed in the central portion of the terminal plate. In the punching portion 35, the terminal plate 29 is provided in the accommodating portion 20.
The press-fitting portion 34 is formed inside the terminal plate so as to be easily bent when it is inserted into the terminal plate. Punching part 35
Is longer than the press-fitting portion 34 in the longitudinal direction of the terminal plate, and has a size occupying most of the width in the width direction of the terminal plate.

The terminal plate is press-fitted into the accommodating portion 20 even at the lower limit of the tolerance width of the press-fitting margin.
4 is formed large. Due to the punched-out portion 35, even when the tolerance width of the press-fitting margin is at the upper limit, the press-fitting portion 34 bends inside the terminal plate, and the terminal plate can be inserted into the housing portion 20 without being tight.

Further, in order to easily insert the terminal plate into the accommodating portion 20, the press-fitting portion 34 is formed so that the width of the terminal plate in the press-fitting portion 34 becomes narrower toward the connecting portion 29b side.

When the punched portion is formed on the terminal plate, if the punched portion is formed so as to allow the press-fitting portion to bend inside the terminal plate, the punched portion is 1
The number is not limited to one, and a plurality may be formed. For example, two punched portions may be formed so as to extend in the longitudinal direction of the terminal plate. Also, three or more punched portions may be formed.

The number of the press-fitting portions 31 and the press-fitting portions 34 is not limited to two, and one or three or more may be formed on the terminal plate. -The convex portion 20c forming the holding portion in the housing portion 20 is
The wall 20a is not limited to be formed so as to extend along the longitudinal direction of the inner surface of the wall 20a, but may be formed locally, for example. For example, as shown in FIG. 10, the convex portion 36 may be formed on the inner surface of the wall portion 20a so as to be located at the center portion in the longitudinal direction thereof. Further, the convex portion 36 is not limited to be formed at the center portion in the longitudinal direction on the inner surface of the wall portion 20a, and may be formed at a plurality of locations.

The accommodating portion 20 is not limited to having a bottom portion, and may be, for example, a through hole. For example, as shown in FIG. 11, the holder body 17 has a through hole 40 as a housing portion.
Equipped with. The through hole 40 intersects the formation surface S2.

In addition, the connector terminal 19 has a distal end portion extended to form a terminal extension portion 41, and the terminal extension portion 41 is bent toward the brush 7 side to extend from the bottom surface portion 17d of the holder body 17 into the holder body 17. To expose.

When the choke coil 23 is inserted into the through hole 40 as shown in FIG. 11, the choke coil 23 is inserted.
The choke coil 23 is connected to the connector terminal 19 by soldering the connection portion 42 as one end of the terminal extension portion 41. The choke coil 23 intersects the forming surface S2. Further, when the terminal plate 29 is inserted in the through hole 40, the connection portion 29b of the terminal plate 29 is bent toward the terminal extension portion 41 side and the connection portion 29b is soldered to the terminal extension portion 41, so that the terminal plate 29 is removed. Connect to the connector terminal 19.

Motors of this type tend to be smaller and lighter year by year, and under these circumstances, there is an increasing demand for motors that prevent electromagnetic noise. Therefore, there arises a problem of how to store a conductive member such as a choke coil in a limited area in the motor.

If the yoke housing is relatively large,
The brush holder and the conductive member are all housed in the yoke housing. Originally, that is electromagnetic noise removal (EMC)
Preferred for. However, when the yoke housing is downsized along with the downsizing of the motor as a whole, the brush holder and the conductive member cannot be fully accommodated in the yoke housing.

Therefore, a conductive member such as a choke coil is inserted into the through hole 40, and the conductive member such as the choke coil is brushed in a state where the conductive member such as the choke coil is intersected with the contact surface (matching surface) S1 between the yoke housing 3 and the gear housing 10. Hold on. By holding in this way, the miniaturized motor can be equipped with a conductive member such as a choke coil having a sufficient capacity (size).

Further, since the accommodating portion is the through hole, the conductive member such as the choke coil is attached to the brush holder in a state of penetrating the accommodating portion, so that the conductive member such as the choke coil can be easily increased in size.

The clamped portion 8a of the brush holder 8 is clamped by the contact portion 3b of the yoke housing 3 and the fixed portion 10a of the gear housing 10 not only in the straight portion 17a of the holder body 17, but also in an arc shape. You may pinch in the part 17b. Further, the clamped portion 8a may be clamped by the contact portion 3b of the yoke housing 3 and the fixed portion 10a of the gear housing 10 over the entire circumference of the holder body 17.

The clamped portion 8a is not limited to be formed over the entire circumference of the holder body 17, but may be, for example, the linear portion 17a.
It is formed only on a, and the linear portion 17a is provided on the contact portion 3b of the yoke housing 3 and the fixed portion 10a of the gear housing 10.
It may be sandwiched by and.

The brush holder 8 is not limited to be held by the motor 1 by being held by the yoke housing 3 and the gear housing 10 in the held portion 8a, and may be held by the motor 1 by another attachment method. .

The brush holder is not limited to being a separate body from the gear housing 10, and the brush holder and the gear housing may be integrally formed. -In the above-mentioned embodiment, although storage part 20 was arranged in a position shown in Drawing 7 (b), it may change so that storage part 20 may be arranged in a corner on a diagonal, respectively.

In the above embodiment, the accommodating portion 20 has a substantially bottomed cylindrical shape, but the shape of the accommodating portion 20 is not limited to this, and may be, for example, a polygonal cylinder such as a square cylinder. . In the above embodiment, two brushes 7 are provided, but the number of brushes 7 is not limited to this.

In the above-described embodiment, the motor 1 with a reduction mechanism is used, but it may be changed to a configuration used for a motor having another configuration, for example, a motor having no reduction mechanism.

Next, the technical idea that can be understood from the above-described embodiment will be described below. (1) In the invention according to any one of claims 3 or 4 and 6, the conductive member is a choke coil, and the holding portion is a convex portion capable of engaging with the choke coil and elastic. Equipped with a piece.

(2) In the invention of claim 5 or 6, a press-fitting portion is formed in the terminal plate. (3) In the invention described in (2), the press-fitting portion is formed so as to be deformable inside the terminal plate.

(4) In the invention described in (3), the press-fitting portion is formed as an elastic protrusion extending obliquely outward toward the side opposite to the press-fitting direction of the terminal plate into the accommodating portion, and the terminal is provided. A gap is provided inside the press-fitting portion of the plate.

(5) In the invention described in (3), a punching portion is formed in the terminal plate so as to allow the press-fitting portion to bend inside the terminal plate.

[0086]

As described above in detail, according to the inventions of claims 1 to 5, the brush holder can be standardized and used regardless of the presence or absence of the choke coil. According to the inventions of claims 6 to 12, the electric motor can be easily manufactured even when the conductive member mounted on the brush holder is different.

[Brief description of drawings]

FIG. 1A is a schematic plan view of a brush holder with a terminal plate attached, and FIG. 1B is a schematic plan view of a brush holder with a choke coil attached.

FIG. 2A is a partial schematic cross-sectional view showing a state where the terminal plate is accommodated in the accommodating portion, and FIG. 2B is a partial schematic cross-sectional view showing a state where the choke coil is accommodated in the accommodating portion.

FIG. 3A is a partially cutaway schematic front view of a motor, and FIG.
Is a partial schematic right side view of the power feeding unit.

FIG. 4 is a schematic perspective view showing a terminal plate.

FIG. 5 is a schematic diagram showing a relationship between a terminal plate, a brush, and a pigtail.

FIG. 6 is a schematic bottom view of the brush holder.

7A is a schematic front view of a brush holder, and FIG. 7B is a schematic plan view of the same.

FIG. 8 is a schematic plan view showing another example of the terminal plate.

9A is a schematic plan view showing another example of the terminal plate, and FIG. 9B is a schematic plan view showing another example of the terminal plate.

FIG. 10 is a partial schematic cross-sectional view of a housing portion including a protrusion according to another example.

FIG. 11 is a partial schematic cross-sectional view of a housing portion of another example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric motor, 3 ... York housing as a motor housing, 4 ... Rotating shaft, 5a ... Commutator, 7 ... Brush, 7a ... Pigtail as a lead wire, 8 ... Brush holder, 8a ... Clamping part, 10 ... Gear housing 1
5 ... power feeding part, 16 ... power source terminal as power feeding terminal, 17 ...
Holder body, 17e ... Brush accommodating portion, 19 ... Connector terminal as terminal, 19a ... Exposed portion, 20 ...
Storage part, 20b ... Elastic pieces, 20c, 3 constituting a holding part
6 ... Similarly convex part, 23 ... Choke coil as conductive member, 29 ... Similarly terminal plate, 29a, 31, 34 ...
Press-fitting part, 40 ... Through hole, 41 ... Terminal extension part, S1
... Abutment surface of gear housing and motor housing, S2
... A surface (formation surface) that is orthogonal to the rotation axis of the electric motor and that includes the held portion formed on the brush holder.

Claims (12)

[Claims] 1. A resin brush holder integrally formed with a holder main body having a brush accommodating portion for slidably holding a brush toward a commutator and a power feeding portion for holding a power feeding terminal for feeding power to the brush. Then, the brush holder is formed with an accommodating portion capable of accommodating a conductive member connected to the brush via a lead wire, and a terminal continuously formed from the power feeding portion is insert-molded, Part of the terminal is exposed in the housing, and the brush is configured to be energizable via the conductive member that engages with a part of the terminal exposed in the housing. And brush holder. 2. The brush holder according to claim 1, wherein the accommodating portion is formed along an axial direction of a rotary shaft that is inserted into the commutator. 3. The brush holder according to claim 1, wherein the holding portion is formed with a holding portion that holds the conductive member and that protrudes inward. 4. The brush holder according to claim 1, wherein the conductive member is a choke coil. 5. The brush holder according to claim 1, wherein the conductive member is a terminal plate and is press-fitted and fixed in the housing portion. 6. An electric motor comprising the brush holder according to any one of claims 1 to 5. 7. The electric motor according to claim 6, wherein the brush holder is sandwiched and held between a gear housing and a motor housing. 8. The electric motor according to claim 7, wherein the conductive member is accommodated in a state where the conductive member intersects with a contact surface between the gear housing and the motor housing. 9. The electric motor according to claim 7, wherein the terminal is exposed from a bottom portion of the accommodating portion. 10. A holder main body having a brush accommodating portion for slidably holding a brush toward a commutator, and a power feeding portion holding a power feeding terminal for feeding power to the brush are integrally formed, and a gear housing and a motor housing are provided. An electric motor comprising a resin brush holder that is sandwiched and held between, and a housing portion that can house a conductive member connected to the brush via a lead wire is formed in the brush holder. In addition, a terminal continuously formed from the power feeding portion is insert-molded, a part of the terminal is exposed in the accommodating portion, and the brush is a part of the terminal exposed in the accommodating portion. The accommodating portion that is configured to be energizable through the engaging conductive member and is integrally formed with the brush holder is a surface that is orthogonal to the rotation axis of the electric motor. An electric motor which is formed so as to intersect a surface including a held portion for holding formed on the brush holder. 11. An opening and a bottom portion of the accommodating portion are arranged on both sides in an axial direction of a rotating shaft of an electric motor with respect to a held portion for holding formed on the brush holder. The electric motor according to any one of claims 7 to 10. 12. The electric motor according to claim 6, wherein the housing portion is a through hole.