WO2015174449A1

WO2015174449A1 - Electric motor

Info

Publication number: WO2015174449A1
Application number: PCT/JP2015/063751
Authority: WO
Inventors: 夏海田村; 朋生飯島; 哲平時崎; 敏田村
Original assignee: 株式会社ミツバ
Priority date: 2014-05-13
Filing date: 2015-05-13
Publication date: 2015-11-19

Abstract

This electric motor is provided with brushes (31) that make sliding contact with and feed power to a commutator for an armature affixed to a rotating shaft, a brush-holder stay (33) that supports the brushes (31) via a brush holder (41), a noise-prevention element (110) that is electrically connected to the brushes (31), and a terminal (130) and a jumper wire (141) that electrically connect the brush holder (41) and the noise-prevention element (110). A first connection point where the noise-prevention element (110) and the terminal (130) are connected and a second connection point where the terminal (130) and the jumper wire (141) are connected are provided on a first surface (S1) of the brush-holder stay (33) only.

Description

Electric motor

The present invention relates to an electric motor.
The present application is filed on May 13, 2014, Japanese Patent Application No. 2014-099400 filed in Japan, May 8, 2015, Japanese Patent Application No. 2015-095921 filed in Japan, and May 8, 2015. Furthermore, priority is claimed based on Japanese Patent Application No. 2015-095609 filed in Japan, the contents of which are incorporated herein by reference.

Conventionally, as a wiper motor for an automobile, a 3-brush type electric motor capable of switching the rotation speed is sometimes used. In this type of electric motor, a plurality of magnets are arranged at intervals in the circumferential direction on the inner peripheral surface of a bottomed cylindrical yoke, and an armature is rotatably arranged inside these magnets.

The armature includes an armature core that is externally fixed to the rotary shaft, an armature coil that is wound around the armature core, and a commutator that is externally fixed to the rotary shaft so as to be adjacent to the armature core.
The commutator is arranged in the circumferential direction in a state where a plurality of segments are insulated from each other, and an end portion of an armature coil is connected to each of the segments.
A plurality of brushes are slidably contacted with each segment at intervals in the circumferential direction, and power is supplied to each armature coil through these brushes.

Each brush is composed of a low-speed brush and a high-speed brush, and a common brush used in common with these brushes, and each brush is held by a brush holder stay via a brush holder. The low speed brush and the common brush are arranged at positions 180 degrees apart in electrical angle (mechanical angle x number of pole pairs), and the high speed brush is arranged at a predetermined angle in the circumferential direction with respect to the low speed brush. Is done. The speed of the electric motor can be switched by selectively switching the energization to the low speed brush and the high speed brush.

In the holder unit, wiring members such as terminals and jumper wires are used to ensure energization of each brush. And caulking and resistance welding are used for electrical connection of these wiring members.

JP 2004-229419 A

In the conventional electric motor, the electrical connection points of the wiring members in the brush holder stay exist at a plurality of locations on both the front and back surfaces. For this reason, the assembly | attachment property of a wiring member is bad, and an assembly man-hour will start many. Therefore, there is a problem that the cost of the electric motor is increased. In addition, there is a problem in assembly management because the number of assembly steps varies greatly depending on the skill level of the operator.

An object of the present invention is to provide an electric motor capable of improving the assembling property of a wiring member in a brush holder stay.

According to a first aspect of the present invention, an electric motor includes a brush that slidably contacts an armature commutator fixed to a rotating shaft to supply power, a brush holder stay that supports the brush via a brush holder, A noise prevention element electrically connected to a brush, and a plurality of terminals and a plurality of jumper wires for electrically connecting the brush and the noise prevention element, and connecting the noise prevention element and the terminal The plurality of first connection portions and the plurality of second connection portions connecting the terminal and the jumper wire are respectively disposed only on the first surface of the brush holder stay.

By configuring as described above, only the first surface of the brush holder stay has a connection portion between the noise prevention element and the terminal (first connection) and a connection portion between the terminal and the jumper wire (second connection portion). Arranged. For this reason, in the connection work of a noise prevention element, a terminal, and a jumper wire, it can be assembled without performing the work of turning the brush holder stay over. Therefore, the assembling property of the noise prevention element, the terminal, and the jumper wire is improved.

According to the second aspect of the present invention, in the electric motor according to the first aspect of the present invention, the plurality of first connection portions are formed by laser welding the anti-noise element and the terminal. The plurality of second connection portions are formed by laser welding the terminal and the jumper wire.

With the above configuration, the anti-noise element and the terminal, and the terminal and the jumper wire are connected by irradiating the laser beam only from the direction in which the first surface of the brush holder stay faces.

According to the third aspect of the present invention, in the electric motor according to the second aspect of the present invention, the first connection portion and the second connection portion are within 4 mm in the thickness direction of the brush holder stay. Placed at a distance.

By configuring as described above, the error of the distance (focal point) from the laser irradiation port of the laser welding machine to the connection location (first connection portion, second connection portion) can be within 4 mm. For this reason, a 1st connection part and a 2nd connection part are formed only by making it scan along the surface direction of a brush holder stay, without making a laser welding machine scan in the direction orthogonal to the surface direction of a brush holder stay. can do. For this reason, the assembling property of the noise prevention element, the terminal, and the jumper wire can be further improved.

According to the fourth aspect of the present invention, in the electric motor according to any one of the first aspect to the third aspect of the present invention, the terminal is a flat surface in close contact with the brush holder stay. A seat portion, a projection projecting in a direction in which the first surface faces from the seat portion and a lead wire of the anti-noise element is inserted to become the first connection portion, and the first surface from the seat portion And a holding claw portion that holds the jumper wire and serves as the second connection portion.

By configuring as described above, the seat portion is in close contact with the brush holder stay, the top portion of the protrusion is the first connection portion, and the top portion of the holding claw portion is the second connection portion. The position of the two connection portions in the thickness direction of the brush holder stay can be kept constant.

According to the fifth aspect of the present invention, in the electric motor according to the fourth aspect of the present invention, the dimension between the top of the protrusion and the root of the holding claw is 1.5 mm. Is set within.

By configuring as described above, the position error in the thickness direction of the brush holder stay of the first connection portion and the second connection portion can be reduced as much as possible, so that the assembling property of the noise prevention element, the terminal, and the jumper wire can be reduced. Further improvement can be achieved.

According to the sixth aspect of the present invention, in the electric motor according to the fourth aspect or the fifth aspect of the present invention, the surface of the protrusion that receives the lead wire is inserted into the lead wire. The taper surface is tapered so as to taper toward the direction.

By configuring as described above, when the lead wire is inserted into the projecting portion, the lead surface can be smoothly inserted into the projecting portion by using the tapered surface as a guide. For this reason, the assembling property of the noise prevention element and the terminal can be further improved.

According to the seventh aspect of the present invention, in the electric motor according to any one of the first aspect to the sixth aspect of the present invention, the brush holder stay includes the plurality of first connections. A plurality of holding holes for accommodating and holding the terminal while exposing the first portion and the plurality of second connection portions to the first surface, the terminal facing away from the first surface of the brush holder stay It accommodates toward the said holding hole from the direction which a 2nd surface faces.

By configuring as described above, the terminal can be easily and reliably held by the brush holder stay. Moreover, since the terminal is accommodated from the same direction with respect to the brush holder stay, the assembling property of the terminal is improved.

According to an eighth aspect of the present invention, an electric motor according to the seventh aspect of the present invention includes an insulator that holds the anti-noise element and is disposed so as to overlap the second surface. The terminal is clamped by the brush holder stay.

This configuration makes it possible to reliably prevent terminal displacement and dropout.

According to the ninth aspect of the present invention, in the electric motor according to the eighth aspect of the present invention, the anti-noise element is disposed on the surface of the insulator opposite to the brush holder stay, When the lead wire of the noise prevention element protrudes from the surface of the insulator on the brush holder side, and the insulator is superimposed on the second surface, the lead wire of the noise prevention element is inserted into a through hole formed in the terminal. Plugged in.

By configuring as described above, the lead wire of the noise prevention element can be arranged at the terminal only by superposing the insulator on the second surface of the brush holder stay, so that, for example, laser welding can be performed as it is. Therefore, the assembling property of the noise prevention element, the terminal, and the jumper wire can be further improved.

According to the above electric motor, it is possible to improve the assembling property of the noise preventing element, the terminal and the jumper wire in the brush holder stay. And the assembly man-hour can be reduced without being influenced by the skill level of the operator. Therefore, the cost of the electric motor can be reduced.

It is a perspective view of the wiper motor in the embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. It is a disassembled perspective view of the wiper motor in the embodiment of the present invention. It is the holder unit in embodiment of this invention, Comprising: It is the perspective view seen from the 1st surface side. It is the holder unit in embodiment of this invention, Comprising: It is the perspective view seen from the 2nd surface side. It is the B section enlarged view of Drawing 4A. It is a disassembled perspective view of the holder unit in embodiment of this invention. It is a disassembled perspective view of the holder unit in embodiment of this invention. It is the perspective view which looked at the insulator in the embodiment of the present invention from the 2nd surface side. It is the C section enlarged view of FIG. 8A. It is the perspective view which looked at the insulator in the embodiment of the present invention from the 1st surface side. It is a perspective view of the 1st terminal in the embodiment of the present invention. It is sectional drawing of the 1st terminal in embodiment of this invention. It is a figure which shows the state after the laser welding of the 1st terminal in embodiment of this invention. It is explanatory drawing which shows the connection operation | work of the 2nd terminal and brush holder in embodiment of this invention. It is explanatory drawing which shows the connection operation | work of the 2nd terminal and brush holder in embodiment of this invention. It is explanatory drawing which shows the connection operation | work of the 2nd terminal and brush holder in embodiment of this invention. It is explanatory drawing which shows the connection operation | work of the 2nd terminal and brush holder in embodiment of this invention. It is a figure which shows the 1st modification among the modifications of the terminal in embodiment of this invention. It is a figure which shows the 2nd modification among the modifications of the terminal in embodiment of this invention. It is a disassembled perspective view of the modification of the holder unit in embodiment of this invention. It is the perspective view which showed the modification of the holder unit in embodiment of this invention, and looked at the modification of the insulator on the 2nd surface side. It is the expansion perspective view which showed the modification of the insulator in embodiment of this invention, and was seen from the 2nd surface side. It is a figure which shows the wiring process of the modification of the jumper wire in embodiment of this invention. It is a figure which shows the disconnection process of the modification of the jumper wire in embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<Wiper motor>
FIG. 1 is a perspective view of a wiper motor 1 according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
The wiper motor 1 drives, for example, a front wiper (not shown) that wipes the front window of the vehicle.

As shown in FIGS. 1 and 2, the wiper motor 1 includes an electric motor 2, a speed reduction mechanism 4 connected to the rotating shaft 3 of the electric motor 2, and a gear that houses the speed reduction mechanism 4 and a part of the electric motor 2. And a housing 5. The wiper motor 1 is configured to transmit the driving force of the electric motor 2 to the front wiper via an output shaft 95 described later after being decelerated by the speed reduction mechanism 4.

In the following description, the axial direction of the rotating shaft 3 is referred to as a rotating shaft direction O1. Of the rotation axis direction O1, the electric motor 2 (armature 6) side is referred to as a proximal end side, and the speed reduction mechanism 4 (worm 91) side is referred to as a distal end side.
The rotation axis direction O1 coincides with the thickness direction of the holder unit 32 (brush holder stay 33).

<Electric motor>
FIG. 3 is an exploded perspective view of the wiper motor 1.
As shown in FIGS. 2 and 3, the electric motor 2 includes a bottomed cylindrical yoke 7 and an armature 6 rotatably provided in the yoke 7.

In the yoke 7, a plurality of (for example, four) magnets 12 are arranged on the inner peripheral surface of the cylindrical portion 11 along the circumferential direction around the rotation shaft 3.
Of the bottom wall 15 of the yoke 7, a boss portion 13 that protrudes outward in the rotation axis direction O 1 is formed in the center in the radial direction, and the base end portion of the rotation shaft 3 is pivotally supported in the boss portion 13. A bearing 14 is provided.
A plurality of concave portions 16 that are recessed toward the base end side are formed at the opening edge of the cylindrical portion 11 at intervals in the circumferential direction.

The armature 6 includes an armature core 21 fitted and fixed to the rotary shaft 3, an armature coil 22 wound around the armature core 21, and a commutator disposed on the tip side with respect to the armature core 21 along the rotational axis direction O1. 23.
The armature core 21 is formed by laminating magnetic plate materials punched by pressing or the like in the rotation axis direction O1. The armature core 21 is formed with a plurality of teeth 21a around which the armature coil 22 is wound in a radial pattern.

The commutator 23 is externally fixed to the rotary shaft 3 and a plurality of segments 24 formed of a conductive material are attached to the outer peripheral surface thereof. The segment 24 is made of a plate-shaped metal piece that is long in the rotation axis direction O1. The segments 24 are fixed in parallel at equal intervals along the circumferential direction while being insulated from each other.

In each segment 24, a riser 25 is integrally formed on the proximal end side, which is bent in a shape that is folded outward in the radial direction. A terminal portion of the armature coil 22 is wound around the riser 25 and fixed by fusing or the like. Thereby, the segment 24 and the armature coil 22 corresponding to this are electrically connected.
A connection line (not shown) is wound around the risers 25 corresponding to the segments 24 having the same potential, and the connection lines are fixed to the riser 25 by fusing. The connection line is for short-circuiting the segments 24 having the same potential. The connection line is routed between the commutator 23 and the armature core 21.

The brush 31 is in sliding contact with the segment 24 of the commutator 23. The brush 31 supplies a current to the armature coil 22 through the segment 24 by slidingly contacting the segment 24. The brush 31 is held by a brush holder stay 33 (holder unit 32) via a brush holder 41 described later.

<Holder unit>
FIG. 4A is a perspective view of the holder unit 32 as seen from the first surface S1 side. FIG. 4B is a perspective view of the holder unit 32 as seen from the second surface S2 side. FIG. 5 is an enlarged view of a portion B in FIG. 4A. 6 and 7 are exploded perspective views of the holder unit 32. FIG.
As shown in FIGS. 4A to 7, the holder unit 32 is disposed adjacent to the brush holder stay 33 in the radial direction, with the brush holder stay 33 disposed at a position overlapping the electric motor 2 in the rotation axis direction O1. The connector portion 34 and a bridge portion 35 that bridges the brush holder stay 33 and the connector portion 34 in the radial direction are integrally formed of a resin material or the like.

The brush holder stay 33 includes an annular holder base portion 36, and a positioning portion 37 projects from the outer peripheral edge of the holder base portion 36 toward the radially outer side. The distal end portion of the positioning portion 37 is engaged with a frame portion 61 described later. Thereby, positioning along the rotation axis direction O1 of the holder unit 32 with respect to the frame part 61 is performed.
The inner diameter of the holder base portion 36 is set to a size that allows the commutator 23 to be inserted. The commutator 23 is inserted inside the holder base portion 36.

In the brush holder stay 33, a wiring member 120 that electrically connects each brush 31 is disposed on a surface facing the base end side (hereinafter referred to as a first surface S1).
The wiring member 120 has three types of terminals 130 (130A, 130B, and 130C) and five jumper wires 141 to 145.
The detailed configuration of the wiring member 120 will be described later.

In the brush holder stay 33, the insulator 100 that holds the anti-noise element 110 is superimposed on a surface facing the tip side (hereinafter referred to as a second surface S 2). The second surface S2 is a surface facing away from the first surface S1.
Here, the holder unit 32 (the brush holder stay 33, the connector portion 34, and the bridge portion 35) is formed of a resin having a black color, while the insulator 100 is formed of a resin having a natural color. The detailed configuration of the insulator 100 will be described later.

The brush holder 41 is fixed to the second surface S2 of the brush holder stay 33 at three locations in the circumferential direction. The brush holder 41 is formed in a substantially L-shaped cross section by a conductive leaf spring material. More specifically, the brush holder 41 has a connecting portion 41A that contacts the second surface S2 of the brush holder stay 33 and a radially inner side from the radially inner end of the connecting portion 41A along the rotational axis direction O1. And a holder body 41B that bends and extends obliquely.

The connecting portion 41A is formed in a substantially rectangular shape in plan view, and two positioning holes 41C are formed. Positioning pins 33A project from the positions corresponding to the positioning holes 41C of the brush holder stay 33, respectively. The positioning of the brush holder 41 with respect to the brush holder stay 33 is performed by inserting the positioning pin 33A into the positioning hole 41C.

On the other hand, the brush 31 is held in the holder main body 41B.
Each brush 31 has a triangular shape in a side view in which the width in the rotation axis direction O1 gradually decreases as it goes inward in the radial direction. Each brush 31 is fitted with a holder main body 41 B of the brush holder 41 at the base end (outer end in the radial direction). On the other hand, the tip end portion (the inner end portion in the radial direction) is urged toward the commutator 23 by the brush holder 41 and is in sliding contact with the segment 24 of the commutator 23. Thereby, the electric power from a battery (not shown) can be supplied to the commutator 23 via the brush 31.

The brush 31 includes a low speed brush 31a and a high speed brush 31b connected to the anode side, and a common brush 31c connected to the cathode side and commonly used for the low speed brush 31a and the high speed brush 31b. Yes.
The low speed brush 31a is a brush 31 that is used when the front wiper is driven at a low speed by applying a voltage between the low speed brush 31a and the common brush 31c.
The high-speed brush 31b is a brush 31 that is used when driving the front wiper at a high speed by applying a voltage between the high-speed brush 31b and the common brush 31c.

Further, the low speed brush 31a and the common brush 31c have an electrical angle of 180 °, that is, a mechanical angle (the narrower angle (reduced angle side) of the central angles formed by the

brushes

31a and 31c with the rotation shaft 3 as the center). ) At 90 °. On the other hand, the high speed brush 31b is spaced apart by a predetermined angle in the circumferential direction with respect to the low speed brush 31a on the wider angle (dominant angle) side of the central angles formed by the

brushes

31a and 31c with the rotation shaft 3 as the center. (Advanced) is arranged.

In the holder base portion 36, the low speed brush 31a and the high speed brush 31b are arranged on the opposite side of the connector portion 34 with respect to the commutator 23 (rotation axis direction O1). The common brush 31c is disposed on the connector part 34 side with respect to the commutator 23 (rotational axis direction O1).

The bridge portion 35 has a plate shape whose thickness direction is the rotation axis direction O1. The bridge portion 35 extends from a part in the circumferential direction of the holder base portion 36 described above toward the outside in the radial direction. On the second surface S 2 of the bridge portion 35,

jumper wires

42 and 43 are routed toward the connector portion 34. A circuit breaker 44 is fixed to the second surface S2 of the bridge portion 35.

The connector part 34 includes a connector base part 51 extending on the same plane as the brush holder stay 33 and the bridge part 35, and a connector receiving part 52 erected from the connector base part 51 toward the base end side. ing.

A plurality of power terminals 55 for power feeding, contact plates 56 for sensors, and ground plates 57 are embedded in the connector base 51 by insert molding or the like. Two power terminals 55, two contact plates 56, and one ground plate 57 are embedded, and are arranged at intervals in the connector base portion 51.

The power terminal 55 has a plate shape extending along the rotation axis direction O1. The power terminal 55 passes through the connector base portion 51. The power terminal 55 functions as a connector terminal by projecting the base end side into the connector receiving portion 52. Further, the power terminal 55 is exposed on the second surface S2 side of the connector base portion 51 at the tip end side.

Jumper wires

42 and 43 that are electrically connected to the low-speed brush 31a and the high-speed brush 31b are connected to the front end side of each power terminal 55, respectively.

The contact plate 56 is for detecting the rotation angle of a worm wheel 92 described later that constitutes the speed reduction mechanism 4. The contact plate 56 is shaped like a plate extending along the rotation axis direction O1 like the power terminal 55. The contact plate 56 passes through the connector base portion 51. The contact plate 56 functions as a connector terminal by projecting the proximal end side into the connector receiving portion 52. Further, the contact plate 56 extends toward a worm wheel 92 described later while the tip side is bent in a crank shape.
The earth plate 57 is a ground terminal. The ground plate 57 is formed in the same manner as the contact plate 56. An end of a circuit breaker 44 is connected to the ground plate 57.
The circuit breaker 44 is fixed to the second surface S2 of the bridge portion 35. And the edge part of the circuit breaker 44 is connected to the brush holder 41 corresponding to the common brush 31c.

<Insulator>
FIG. 8A is a perspective view of the insulator 100 as seen from the second surface T2 side. FIG. 8B is an enlarged view of a portion C in FIG. 8A. FIG. 8C is a perspective view of the insulator 100 as seen from the first surface T1 side.
As shown in FIGS. 6 and 8A to 8C, the insulator 100 is disposed so as to overlap the second surface S2 of the brush holder stay 33 (holder unit 32). The insulator 100 is formed in an annular flat plate shape that overlaps the holder base portion 36. On the second surface T2 of the insulator 100 opposite to the brush holder stay 33, a laser irradiation convex portion 101 is formed at a position corresponding to the connection portion 41A of the brush holder 41. The laser irradiation convex portion 101 is irradiated with laser light when laser welding the brush holder 41, the terminal 130, and the circuit breaker 44 (details will be described later).

Further, the laser irradiation convex portion 101 is formed with a concave portion 101A for receiving the positioning pin 33A at a position corresponding to the positioning pin 33A of the brush holder stay 33. Thereby, positioning with the brush holder stay 33 (holder unit 32) and the insulator 100 is performed.
Further, on the second surface T2 side of the insulator 100, two choke coils 111 and two capacitors 112, which are noise prevention elements 110, are held.

The two choke coils 111 are held by the insulator 100 so as to be disposed between the high speed brush 31b and the low speed brush 31a. The two capacitors 112 are held by the insulator 100 so as to be disposed between the common brush 31c and the high-speed brush 31b and between the common brush 31c and the low-speed brush 31a, respectively.

In the insulator 100, through holes 102 are formed at positions corresponding to the choke coil 111 and the capacitor 112, respectively, penetrating in the rotation axis direction O1. The lead wires 115 of the choke coil 111 and the capacitor 112 are inserted into the through holes 102. The lead wire 115 such as the choke coil 111 is inserted from the second surface T2 toward the first surface T1 with respect to the through hole 102 and protrudes from the first surface T1.

The through hole 102 is formed in a tapered hole shape that gradually decreases in diameter from the second surface T2 toward the first surface T1 that is the surface on the brush holder stay 33 side.
Since the through hole 102 is formed in a tapered hole shape, the tip of the lead wire 115 of the noise preventing element 110 is inserted along the slope of the through hole 102. Therefore, the wiring assembly of the noise preventing element 110 is easily performed only by disposing the noise preventing element 110 on the second surface T2 of the insulator 100. Then, it is connected to a terminal 130 (130A to 130C) disposed on the brush holder stay 33 side.

<Terminal>
FIG. 9A is a perspective view of the first terminal 130A. FIG. 9B is a sectional view of the first terminal 130A. FIG. 9C is a diagram illustrating a state after laser welding of the first terminal 130A.
The three types of terminals 130 (first terminal 130A, second terminal 130B, and third terminal 130C) are arranged in such a manner that they are arranged (sandwiched) between the brush holder stay 33 and the insulator 100.
The first terminal 130A is a conductive member that electrically connects the lead wire 115 of the noise preventing element 110 and the jumper wires 141 to 145. The second terminal 130B is a conductive member that electrically connects each brush holder 41 and the jumper wires 141 to 143. The third terminal 130C is a conductive member that electrically connects the jumper wires 144 to 145 and the

jumper wires

42 and 43.

The three types of

terminals

130A, 130B, and 130C have similar shapes.
130 A of 1st terminals are the seat part 131 closely_contact | adhered to the brush holder stay 33, the protrusion 132 which protrudes from the center of the seat part 131 to the base end side, and the holding part which protrudes from the side part of the seat part 131 to the base end side. 134.
The second terminal 130 B includes a seat part 131 and a holding part 134.
The third terminal 130 C includes a seat portion 131 and two holding portions 134.
Hereinafter, the shape of the first terminal 130A will be described in detail on behalf of the three types of terminals 130A to 130C.

As described above, the first terminal 130 A includes the seat portion 131, the protruding portion 132, and the holding portion 134.
The seat 131 is a circular or polygonal flat plate-like part. The thickness T1 of the seat 131 is set to about 1 mm, for example. The protrusion 132 is a portion protruding in a conical shape (tapered shape) from the center of the seat portion 131 toward the base end side. The protrusion height T2 of the protrusion 132 from the seat 131 is set to about 2 mm, for example.

A through hole 133 is formed in the center of the protrusion 132 along the rotation axis direction O1. The lead wire 115 of the noise preventing element 110 is inserted into the through hole 133. The back surface (front end side) of the protrusion 132 is formed in a conical hole shape. That is, the inner surface of the through-hole 133 becomes a tapered surface 133 a that gradually decreases in diameter as it goes in the protruding direction of the protrusion 132.

The holding portion 134 is a flat plate-like portion protruding from the side portion of the seat portion 131 toward the proximal end side.
The holding part 134 is formed so as to protrude from the seat part 131 by about 3 to 4 mm, for example. A U-shaped notch 135 is formed at the top of the holding part 134, and a bifurcated holding claw part 134a is provided at the tip. The dimension T3 between the root of the holding claw 134a (the bottom of the notch 135) and the top of the protrusion 132 is set to about 1.5 mm. Jumper wires 144 to 145 are inserted into the notch 135. In other words, the jumper wires 144 to 145 are held by the holding claw portion 134a.

As shown in FIGS. 6 and 7, the terminal 130 is housed and held in a holding hole 151 formed in the brush holder stay 33. The holding hole 151 is a stepped through hole, and a step portion facing the tip side is provided on the inner periphery.
The outer shape of the holding hole 151 is formed in substantially the same shape as the seat portion 131 of the first terminal 130A. The step portion of the holding hole 151 is formed to a depth of about 1 mm from the second surface S2. That is, it is formed to have the same length (depth) as the thickness of the seat portion 131.

When the first terminal 130A is accommodated in the holding hole 151, the first terminal 130A is inserted from the second surface S2 side (the direction in which the second surface S2 faces) of the brush holder stay 33. Then, the protrusion 132 and the holding part 134 are inserted into the holding hole 151 and the seat part 131 is brought into contact with the stepped part.
Thereby, the protrusion 132 and the holding part 134 are exposed from the holding hole 151 opened in the first surface S 1 of the brush holder stay 33. On the other hand, the tapered hole-shaped through hole 133 is exposed from the holding hole 151 that opens in the second surface S 2 of the brush holder stay 33.
Then, the first terminal 130 A is sandwiched between the brush holder stay 33 (holder unit 32) and the insulator 100 by overlapping the insulator 100 on the second surface S 2 of the brush holder stay 33.

Similarly, the terminals 130 B and 130 C are held and held in the holding holes 151 of the brush holder stay 33, and the terminal 130 is sandwiched between the brush holder stay 33 (holder unit 32) and the insulator 100.
Note that the brush holder 41 is disposed in close contact with the distal end side of the second terminal 130B. That is, the second terminal 130 B and the brush holder 41 are sandwiched between the brush holder stay 33 and the insulator 100.

As shown in FIG. 6, when the insulator 100 is stacked on the holder unit 32 (brush holder stay 33), the lead wire 115 protruding from the first surface T 1 of the insulator 100 and the penetration exposed on the second surface S 2 of the brush holder stay 33. The holes 133 are opposed to each other.
For this reason, when the brush holder stay 33 and the insulator 100 are brought into close contact with each other, the lead wire 115 of the noise preventing element 110 is inserted into the through hole 133 of the first terminal 130A. Since the inner surface of the through hole 133 is a tapered surface 133 a, the tip of the lead wire 115 of the noise preventing element 110 is inserted along the slope of the through hole 133. The lead wire 115 protrudes from the top of the seat 131 to the second surface S2 side.
Therefore, the wiring assembly of the noise preventing element 110 is easily performed only by stacking the insulator 100 on the brush holder stay 33.

As shown in FIG. 4A, the jumper wires 141 to 145 are bridged over the holding portion 134 exposed on the first surface S1 of the brush holder stay 33. That is, the jumper wires 141 to 145 are held between the holding claws 134 a of the holding unit 134.
The end portions of the jumper wires 141 to 145 are held by the holding portion 134 (holding claw portion 134a) of the first terminal 130A. Further, intermediate portions of the jumper wires 141 to 143 are sandwiched between the holding portion 134 (holding claw portion 134a) of the second terminal 130B. Further, the end portions of the

jumper wires

144 and 145 are sandwiched between the holding portion 134 (holding claw portion 134a) of the third terminal 130C.
The jumper wires 143 to 145 are also sandwiched by the holding claw 152 formed on the first surface S1 of the brush holder stay 33 (holder unit 32).

Here, as shown in FIG. 9C, the seat portion 131 and the lead wire 115 protruding from the seat portion 131 are connected by laser welding to form a first connection portion 161 that is electrically connected.
The first connection portion 161 is formed by irradiating laser light from the first surface S1 side of the brush holder stay 33 (holder unit 32).
The jumper wires 141 to 145 spanned between the holding portion 134 and the holding claw portion 152 of the holding portion 134 are connected by laser welding to form a second connecting portion 162 that is electrically connected. The second connection portion 162 is formed by irradiating laser light from the first surface S1 side of the brush holder stay 33.
The color of the brush holder stay 33 is preferably a natural color. By setting to such a color, connection workability by laser welding can be improved.

In this way, the first connection portion 161 and the second connection portion 162 are formed by irradiating the laser light from the first surface S1 side of the brush holder stay 33. That is, the first connection portion 161 and the second connection portion 162 are formed by irradiating laser light from the same direction.
Here, each of the terminals 130A to 130C has a dimension T3 between the base portion of the holding claw portion 134a (the bottom portion of the notch 135) and the top portion of the protrusion 132, which is set to about 1.5 mm. The portion 161 and the second connecting portion 162 are arranged in a range where the distance H in the rotation axis direction O1 (thickness direction of the brush holder stay 33) is within 4 mm. For this reason, since the focal length of the laser beam hardly changes, the first laser beam is not scanned in the thickness direction of the brush holder stay 33 by a laser welding machine (not shown), but is only scanned along the surface direction of the brush holder stay 33. The connection part 161 and the second connection part 162 can be formed.

Next, based on FIG. 4B, FIG. 7, and FIGS. 10A to 10D, the second terminal 130B is connected to the two brush holders 41 holding the low-speed brush 31a and the high-speed brush 31b, and common. A connection operation between the brush holder 41 holding the brush 31c and the circuit breaker 44 will be described.
FIGS. 10A to 10D are explanatory views showing a connection operation between the second terminal 130B and the two brush holders 41 holding the low speed brush 31a and the high speed brush 31b.

As shown in FIGS. 10A and 10B, each brush holder 41 is arranged on the second surface S 2 side of the brush holder stay 33 from the terminal 130 A to 130 C attached to the brush holder stay 33. At this time, since the positioning pins 33A are formed in the brush holder stay 33 and the positioning holes 41C are formed in the brush holder 41, the positioning of the brush holder 41 with respect to the brush holder stay 33 can be easily performed. it can. This also ensures that the seat 131 of the second terminal 130B and the connection 41A of the brush holder 41 overlap.
Further, as shown in FIGS. 4B and 7, the terminal 44a of the circuit breaker 44 is overlaid on the connecting portion 41A of the brush holder 41 holding the common brush 31c.

Next, as illustrated in FIGS. 10C and 10D, the insulator 100 is overlaid on the second surface S 2 of the brush holder stay 33. Accordingly, the seat portion 131 of each terminal 130 and the connection portion 41 A of each brush holder 41 are sandwiched between the brush holder stay 33 and the insulator 100.
Here, the laser irradiation convex portion 101 of the insulator 100 is formed with a concave portion 101A for receiving the positioning pin 33A at a position corresponding to the positioning pin 33A of the brush holder stay 33. For this reason, positioning with the brush holder stay 33 and the insulator 100 can be performed easily.

And as shown to FIG. 10D, the laser beam L is irradiated from the laser irradiation convex part 101 of the insulator 100. FIG. Here, the insulator 100 is formed of a resin having a natural color. On the other hand, the holder unit 32 (brush holder stay 33, connector part 34, bridge part 35) is formed of a resin whose color is black. Natural colors are said to have good heat transfer (transmittance of laser light L). On the other hand, black is said to have good heat absorption.

For this reason, the heat by the laser beam L is efficiently transmitted to the connection part 41A of each brush holder 41, the seat part 131 of the second terminal 130B, and the terminal 44a of the circuit breaker 44 via the laser irradiation convex part 101. The Therefore, the seat part 131 of the second terminal 130B and the connection part 41A of the brush holder 41 are laser-welded. Further, the terminal 44a of the circuit breaker 44 and the connecting portion 41A of the brush holder 41 are laser-welded.

Furthermore, positioning pins 33A of the brush holder stay 33 are inserted into the laser irradiation convex portion 101. The positioning pin 33A (brush holder stay 33) is made of resin. For this reason, the heat by the laser beam L is transmitted to the positioning pin 33 A through the laser irradiation convex portion 101. Thereby, the positioning pin 33A is melted, and the laser irradiation convex portion 101 and the positioning pin 33A are welded. Then, the holder unit 32 and the insulator 100 are fixed.

<Gear housing>
As shown in FIGS. 1 and 2, the gear housing 5 includes an aluminum die-cast frame portion 61 formed in a bottomed cylindrical shape, and a resin bottom plate 62 that closes an opening 61 a of the frame portion 61. It is equipped with.
The inside of the frame portion 61 is defined by a speed reduction mechanism storage portion 65 that stores the speed reduction mechanism 4 and a holder unit storage portion 66 that is connected to a part of the peripheral wall portion 64 and stores the holder unit 32. .

<Deceleration mechanism>
As shown in FIGS. 2 and 3, the speed reduction mechanism 4 includes a worm 91 connected to the rotating shaft 3 of the electric motor 2 and a worm wheel 92 that meshes with the worm 91.
The base end side of the worm 91 is connected to the rotating shaft 3 in the speed reduction mechanism housing portion 65, and the distal end side is rotatably supported in the speed reduction mechanism housing portion 65 by a bearing (not shown). Further, a portion of the worm 91 that is connected to the rotating shaft 3 (a tip portion of the rotating shaft 3) is rotatably supported by a rolling bearing 93 disposed in the frame portion 61.

The worm wheel 92 is housed in the speed reduction mechanism housing portion 65 and is configured to rotate as the worm 91 rotates. A boss portion 94 that protrudes toward the bottom plate 62 is formed at the central portion (hub portion) of the worm wheel 92. A base end portion of the output shaft 95 is press-fitted into the boss portion 94 from the frame portion 61 side.
The distal end portion of the output shaft 95 protrudes outside the frame portion 61 through the sleeve 82 of the frame portion 61. An external mechanism for driving a front wiper (not shown) is connected to the protruding portion. Further, the output shaft 95 is rotatably supported by the above-described sliding bearing 83 in the sleeve 82.

In the wiper motor 1 configured as described above, when a wiper switch (not shown) is switched from the OFF position to the LOW position, a drive current is supplied from the battery to the low speed brush 31a of the electric motor 2. Thereby, the electric motor 2 starts driving in the low speed operation mode. Specifically, when the electric motor 2 is driven, the driving force is decelerated by the speed reduction mechanism 4 and then transmitted to the external mechanism of the front wiper via the output shaft 95. Thereby, a front wiper operates and it can wipe away the dust, raindrops, etc. which adhered to the windshield.
On the other hand, when the wiper switch is switched to the HIGH position, a driving current is supplied from the battery to the high-speed brush 31b of the electric motor 2. As a result, the electric motor 2 starts driving in the high-speed operation mode that is faster than the low-speed operation mode described above.

As described above, in the wiper motor 1 of the present embodiment, the first connection portion 161 that connects the anti-noise element 110 and the terminal 130 and the second connection portion 162 that connects the terminal 130 and the jumper wire 141 and the like are respectively connected to the brush holder stay. 33 (holder unit 32) is disposed only on the first surface S1. For this reason, when performing the connection work between the noise prevention element 110 and the terminal 130 and the connection work between the terminal 130 and the jumper wire 141, the brush holder stay 33 (holder unit 32) can be assembled without being turned over. it can. Therefore, the assembling property of the wiring member 120 is improved, and the number of manufacturing steps and the manufacturing cost can be reduced.

Further, the terminal 130 has a flat seat 131 that is in close contact with the brush holder stay 33, and a protrusion 132 that protrudes toward the base end side (the direction in which the first surface S1 faces) and through which the lead wire 115 of the noise prevention element 110 is inserted. And a holding portion 134 that protrudes toward the base end side and holds the jumper wire 141 and the like.
For this reason, the seat portion 131 is in close contact with the brush holder stay 33, and the top portion of the protruding portion 132 becomes the first connecting portion 161. Further, the top of the holding portion 134 becomes the second connection portion 162. Therefore, the positions of the first connection part 161 and the second connection part 162 can be kept constant.

Further, the brush holder stay 33 has a holding hole 151 for accommodating and holding the terminal 130 while exposing the first connection portion 161 and the second connection portion 162 to the first surface S1. Then, the terminal 130 is accommodated in the holding hole 151 from the second surface S2 side.
For this reason, the terminal 130 can be easily and reliably held by the brush holder stay 33 (holder unit 32). Moreover, since the terminal 130 is accommodated with respect to the brush holder stay 33 from the same direction, the assembling property of the wiring member 120 (terminal 130) can be improved.

Further, the wiper motor 1 includes an insulator 100 that holds the noise prevention element 110 and is disposed so as to overlap the second surface S2. The terminal 130 is held between the insulator 100 and the brush holder stay 33 (holder unit 32). For this reason, it is possible to surely prevent the terminal 130 from being displaced or dropped.
When the insulator 100 is arranged so as to overlap the second surface S 2, the lead wire 115 of the noise preventing element 110 is inserted into the tapered through hole 133 formed in the protrusion 132. For this reason, the lead wire 115 of the noise prevention element 110 is disposed on the seat portion 131 of the terminal 130 simply by superimposing the insulator 100 on the second surface S2 of the brush holder stay 33, so that laser welding can be performed as it is. it can. Therefore, the assembling property of the wiring member 120 can be further improved.

Further, each of the terminals 130A to 130C is formed so that a dimension T3 between the base part of the holding claw part 134a (the bottom part of the notch 135) and the top part of the protrusion 132 is about 1.5 mm. The first connecting portion 161 and the second connecting portion 162 are arranged in a range where the distance H in the rotation axis direction O1 (thickness direction of the brush holder stay 33) is within 4 mm. For this reason, since the focal length of the laser beam hardly changes, a laser welding machine (not shown) is not scanned in the thickness direction of the brush holder stay 33. And the 1st connection part 161 and the 2nd connection part 162 can be formed only by making it scan along the surface direction of the brush holder stay 33. FIG. Therefore, the assembly property of the wiring member 120 can be further improved.

Further, the holder unit 32 has a seat portion 131 of each terminal 130 (130A, 130B, 130C) and a connection portion 41A of the brush holder 41 between the brush holder stay 33 (holder unit 32) and the insulator 100. ing. For this reason, the assembly of the terminals 130 and the brush holder 41 to the holder unit 32 is completed only by sandwiching the seat portion 131 and the connecting portion 41 A between the brush holder stay 33 and the insulator 100. For this reason, the assembly work of each terminal 130 and the brush holder 41 can be simplified.

Also, the color of the resin forming the insulator 100 is set to a natural color that is considered to have good heat transfer (transmittance of the laser light L). That is, the whole insulator 100 is configured as an easy heat transfer unit. For this reason, if the laser beam L is irradiated from above the laser irradiation convex portion 101 of the insulator 100, the seat portion 131B of the second terminal 130B and the connection portion 41A of the brush holder 41 are laser-welded. Further, the terminal 44a of the circuit breaker 44 and the connecting portion 41A of the brush holder 41 are laser-welded. Therefore, it is not necessary to perform caulking or resistance welding in the connection work process of the terminal 130, the brush holder 41, and the circuit breaker 44, and the connection process can be facilitated.

Also, the color of the resin forming the holder unit 32 (brush holder stay 33, connector portion 34, bridge portion 35) is set to black, which is considered to absorb heat well. For this reason, the heat of the laser beam L irradiated from the insulator 100 can be efficiently absorbed by the brush holder stay 33. Therefore, the connection work process of the terminal 130, the brush holder 41, and the circuit breaker 44 can be performed more efficiently.

Furthermore, a positioning hole 41C is formed in the connecting portion 41A of each brush holder 41. On the other hand, the brush holder stay 33 is provided with a positioning pin 33A that can be inserted into the positioning hole 41C. For this reason, the brush holder 41 can be easily positioned with respect to the brush holder stay 33, and the number of assembling steps can be simplified.

Further, the laser irradiation convex portion 101 of the insulator 100 is formed with a concave portion 101A for receiving the positioning pin 33A of the brush holder stay 33. For this reason, positioning with the brush holder stay 33 (holder unit 32) and the insulator 100 can be performed easily, and an assembly man-hour can further be simplified. In addition, since the positioning pin 33A is made of resin, the laser irradiation convex portion 101 and the positioning pin 33A can be welded by the laser light L. For this reason, the fixing process of the holder unit 32 and the insulator 100 can be completed simultaneously with the connection work process of the terminal 130, the brush holder 41, and the circuit breaker 44. Therefore, the assembly man-hour can be further simplified.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

<Variation of terminal>
FIG. 11A is a diagram illustrating a first modification among the modifications of the terminal 130. FIG. 11B is a diagram illustrating a second modification among the modifications of the terminal 130.
The notch 135 formed at the top of the holding part 134 is not limited to a U-shape. As shown in FIG. 11A, a V-shaped notch 136 may be provided.
The protrusion 132 is not limited to the case where the protrusion 132 protrudes conically from the center of the seat 131. As shown in FIG. 11B, a pair of bent portions 137 in which a part of the seat portion 131 is bent may be provided. The bent portion 137 is formed so as to surround the through hole 133. In this case, the through hole 133 is formed not in a tapered hole shape but in a cylindrical shape.

<Modification of brush holder>
FIG. 12A is an exploded perspective view of a modified example (holder unit 232) of the holder unit 32. FIG. FIG. 12B is a perspective view of a modified example (insulator 300) of the insulator 100 as seen from the second surface side.
FIG. 13 is an enlarged perspective view showing a modified example (insulator 300) of the insulator 100 as seen from the second surface side.

In the holder unit 32 of the above-described embodiment, the brush 31 is not limited to being held by the brush holder stay 33 via the brush holder 41.
As shown in FIG. 13, the brush 231 may be held by the insulator 300.
The brush 231 is formed of a conductive material such as graphite and is held by the insulator 300 via a box-shaped brush holder 241. A spring member 245 fixed to the insulator 300 is disposed on the side of the brush holder 241.
The brush 231 is urged radially inward by the spring member 245 while being accommodated and held in the brush holder 241, and is in sliding contact with the segment 24 of the commutator 23.

The insulator 300 is formed with a through hole 102 penetrating in the rotation axis direction O1. A pigtail 231 s protruding from the brush 231 is inserted into the through hole 102.
The pigtail 231s of the brush 231 is inserted into the through hole 102 from the second surface T2 toward the first surface T1, and protrudes from the first surface T1.
Since the through hole 102 is formed in a tapered hole shape, the wiring of the pigtail 231s can be easily performed only by arranging the brush 231 on the second surface T2 of the insulator 300. The pigtail 231s is connected to the terminal 130 disposed on the brush holder stay 233 side.

<Modification of jumper wire>
FIG. 14A is a diagram showing a wiring process of a modification of the jumper lines 141 to 145. FIG. FIG. 14B is a diagram showing a disconnection process of a modified example of the jumper wires 141 to 145.
The jumper wires 141 to 145 of the above-described embodiment are bridged over the holding portions 134 exposed on the first surface S1 of the brush holder stay 33, respectively. That is, the jumper wires 141 to 145 are respectively held by the holding claws 134a of the holding part 134.
As described above, when a plurality of jumper wires 141 to 145 are prepared for each section, there is a concern that the number of parts increases and assembly efficiency deteriorates.
Therefore, the steps shown in FIGS. 14A and 14B may be employed.

First, as shown in FIG. 14A, one jumper line 140 is prepared. The jumper wire 140 is sufficiently longer than the total length of the jumper wires 141 to 145. And the jumper wire 140 is spanned over all the holding parts 134, and laser welding is performed after that. At this time, all the holding parts 134 are connected (conducted) via the jumper wires 140.
Next, as shown in FIG. 14B, unnecessary portions (sections) of the jumper wire 140 are cut (disconnected). As a result, the jumper wires 141 to 145 remain.
By passing through such a process, an increase in the number of parts can be prevented or the assembling efficiency can be improved.

<Other variations>
In the above-described embodiment, the case where the 4-pole-3 brush electric motor 2 is employed has been described. However, the present invention is not limited to this, and a 6-pole or 8-pole-3 brush electric motor 2 may be employed. However, the low speed brush 31a and the common brush 31c need to be arranged with a mechanical angle of 60 ° in the case of 6 poles and 45 ° in the case of 8 poles.

Furthermore, in the above-described embodiment, the case where the brush holder stay 33 is formed in an annular shape has been described. However, the present invention is not limited thereto, and may be, for example, U-shaped as long as the commutator 23 can be inserted.
Moreover, although embodiment mentioned above demonstrated the case where the brush holder stay 33 and the connector part 34 were integrally formed as the holder unit 32, it is not restricted to this.

Furthermore, in the above-described embodiment, the configuration in which the wiper motor 1 of the present invention is used for driving the front wiper has been described. However, the present invention is not limited to this, and it may be used for driving a rear wiper or the like, or for a general motor other than the wiper motor 1.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

For example, in the above-described embodiment, the case where the color of the entire insulator 100 is set to the natural color of the resin has been described. However, the present invention is not limited to this, and at least the laser irradiation convex portion 101 may be formed to have a natural color. It is also possible to set the color of the insulator 100 to black and the color of the brush holder stay 33 (holder unit 32) to a natural color. In this case, the laser beam L is irradiated from the brush holder stay 33 side. Furthermore, you may set the color of both the insulator 100 and the brush holder stay 33 (holder unit 32) to a natural color.

Further, in the above-described embodiment, the case has been described in which the heat transfer portion having good heat transfer of the laser light L (transmittance of the laser light L) is configured by setting the color of the resin to a natural color. However, the present invention is not limited to this, and the heat transfer portion may be configured using a material having good heat transfer of the laser beam L (transmittance of the laser beam L) and insulating properties.

DESCRIPTION OF SYMBOLS 1 Wiper motor 2 Electric motor 3 Rotating shaft 6 Armature 23 Commutator 31 Brush 33 Brush holder stay 41 Brush holder 100 Insulator 1002 Through hole 110 Anti-noise element 115 Lead wire 120 Wiring member 130 Terminal

130A First terminal

130B Second terminal

130C Third terminal 131 Seat part 132 Projection part 133 Through-hole 133a Tapered surface 134 Holding part 134a Holding claw part 135 Notch 140 Jumper wire 141-145 Jumper wire 151 Holding hole 161 First connection part 162 Second connection part 231 Brush 231s Pigtail 233 Brush holder Stay 241 Brush holder 245 Spring member 300 Insulator S1 First surface S2 Second surface H Distance

Claims

A brush that slidably contacts an armature commutator fixed to the rotating shaft,
A brush holder stay for supporting the brush via a brush holder;
An anti-noise element electrically connected to the brush;
A plurality of terminals and a plurality of jumper wires for electrically connecting the brush and the anti-noise element;
With
A plurality of first connection portions that connect the noise prevention element and the terminal, and a plurality of second connection portions that connect the terminal and the jumper wire are respectively disposed only on the first surface of the brush holder stay. Electric motor.
The plurality of first connection portions are formed by laser welding the anti-noise element and the terminal,
The electric motor according to claim 1, wherein the plurality of second connection portions are formed by laser welding the terminal and the jumper wire.
The electric motor according to claim 2, wherein the first connection portion and the second connection portion are arranged at a distance of 4 mm or less in the thickness direction of the brush holder stay.
The terminal is
A flat seat closely contacting the brush holder stay;
A protrusion that protrudes in the direction in which the first surface faces from the seat and passes through the lead wire of the noise prevention element and becomes the first connection portion; and
A holding claw that protrudes in a direction in which the first surface faces from the seat and holds the jumper wire and becomes the second connection portion;
The electric motor according to claim 1, comprising:
The electric motor according to claim 4, wherein a dimension between a top portion of the protrusion and a root portion of the holding claw portion is set within 1.5 mm.
6. The electric motor according to claim 4 or 5, wherein a surface of the projecting portion that receives the lead wire has a tapered surface so as to be tapered toward the insertion direction of the lead wire.
The brush holder stay has a plurality of holding holes for accommodating and holding the terminal while exposing the plurality of first connection portions and the plurality of second connection portions to the first surface,
The electric motor according to any one of claims 1 to 6, wherein the terminal is accommodated toward the holding hole from a direction in which a second surface facing away from the first surface of the brush holder stay faces.
An insulator that holds the anti-noise element and is arranged to be superimposed on the second surface,
The electric motor according to claim 7, wherein the terminal is sandwiched between the insulator and the brush holder stay.
The anti-noise element is disposed on the surface of the insulator opposite to the brush holder stay, and the lead wire of the anti-noise element protrudes from the surface of the insulator on the brush holder side,
The electric motor according to claim 8, wherein when the insulator is arranged so as to overlap the second surface, a lead wire of the noise prevention element is inserted into a through hole formed in the terminal.