JP2015233402A - Electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motor which enables improvement of the assemblability of a wiring member in a brush holder stay.SOLUTION: An electric motor includes: a brush 31 which slidably contacts with a commutator of an armature fixed to a rotary shaft and supplies electric power to the armature; a brush holder stay 33 which supports the brush 31 through a brush holder 41; a noise-prevention element 110 electrically connected with the brush 31; and a terminal 130 and a jumper wire 141 which electrically connect the brush holder 41 with the noise-prevention element 110. A first connection part, in which the noise-prevention element 110 and the terminal 130 are connected, and a second connection part, in which the terminal 130 and the jumper wire 141 are connected, are disposed only on a first surface S1 of the brush holder stay 33.

Description

  The present invention relates to an electric motor.

  2. Description of the Related Art Conventionally, as a wiper motor for an automobile, a three-brush electric motor that can switch 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 in order to ensure energization of each brush. And caulking and resistance welding are used for electrical connection of these wiring members.

JP 2004-229419 A

  However, in the conventional electric motor, the electrical connection portions 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.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an electric motor capable of improving the assembling property of a wiring member in a brush holder stay.

In order to solve the above problems, the following means are adopted.
An electric motor according to the present invention is electrically connected to a brush that supplies power by sliding contact with an armature commutator fixed to a rotating shaft, a brush holder stay that supports the brush via a brush holder, and the brush. And a plurality of terminals and a plurality of jumper wires for electrically connecting the brush and the noise preventing element, and a plurality of first connection portions for connecting the noise preventing 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.

  With this configuration, only the first surface of the brush holder stay is provided with 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). Established. 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.

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

  By comprising in this way, a noise prevention element, a terminal, a terminal, and a jumper line are each connected by irradiating a laser beam only from the direction which the 1st surface of a brush holder stay faces.

  In the electric motor according to the present invention, 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.

  By comprising in this way, the error of the distance (focal point) from the laser irradiation port of a laser welding machine to a connection location (a 1st connection part, a 2nd connection part) can be made into 4 mm or less. 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.

  In the electric motor according to the present invention, the terminal has a flat seat portion that is in close contact with the brush holder stay, a terminal that protrudes from the seat portion in a direction in which the first surface faces, and a lead wire of the noise prevention element. A protrusion that is inserted to become the first connection part, and a holding claw part that protrudes from the seat part in a direction in which the first surface faces and holds the jumper wire and becomes the second connection part. It is characterized by that.

  By comprising in this way, a seat part closely_contact | adheres to a brush holder stay, the top part of a protrusion becomes a 1st connection part, and the top part of a holding nail | claw part becomes a 2nd connection part, Therefore A 1st connection part and 2nd The position of the connecting portion in the thickness direction of the brush holder stay can be kept constant.

  The electric motor according to the present invention is characterized in that a dimension between the top of the protrusion and the root of the holding claw is set within 1.5 mm.

  By comprising in this way, since the error of the position in the thickness direction of the brush holder stay of the 1st connection part and the 2nd connection part can be made as small as possible, the assembly nature of a noise prevention element, a terminal, and a jumper line is further Can be improved.

  Moreover, the electric motor according to the present invention is characterized in that 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. .

  With this configuration, when the lead wire is inserted into the protrusion, the lead surface can be smoothly inserted into the protrusion with the tapered surface serving as a guide. For this reason, the assembling property of the noise prevention element and the terminal can be further improved.

  Further, in the electric motor according to the present invention, the brush holder stay has a plurality of holdings for accommodating and holding the terminal while exposing the plurality of first connection parts and the plurality of second connection parts to the first surface. It has a hole, and 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.

  By comprising in this way, a terminal can be hold | maintained easily and reliably by a 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.

  The electric motor according to the present invention includes an insulator that holds the anti-noise element and is disposed so as to overlap the second surface, and the terminal is sandwiched between the insulator and the brush holder stay.

  With this configuration, it is possible to reliably prevent the terminal from being displaced or dropped.

  In the electric motor according to the present invention, the noise prevention element is disposed on a surface of the insulator opposite to the brush holder stay, and a lead of the noise prevention element is disposed on the brush holder side surface of the insulator. When the insulator is overlaid on the second surface, a lead wire of the noise prevention element is inserted into a through hole formed in the terminal.

  By comprising in this way, the lead wire of a noise prevention element is arrange | positioned at a terminal only by arrange | positioning an insulator on the 2nd surface of a brush holder stay, Therefore 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.

  ADVANTAGE OF THE INVENTION According to this invention, the assembly | attachment property of the noise prevention element in a brush holder stay, a terminal, and a jumper wire can be improved. 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. It is sectional drawing which follows the AA line of 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: (a) is the perspective view seen from the 1st surface side, (b) is the perspective view seen from the 2nd surface side. It is the B section enlarged view of Drawing 4 (a). 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. BRIEF DESCRIPTION OF THE DRAWINGS It is the insulator in embodiment of this invention, Comprising: (a) is the perspective view seen from the 2nd surface side, (b) is the C section enlarged view of Fig.8 (a), (c) is the perspective view seen from the 1st surface side. FIG. It is a figure which shows the 1st terminal in embodiment of this invention, Comprising: (a) is a perspective view, (b) is sectional drawing, (c) is a figure which shows the state after laser welding. It is a figure which shows the modification of the terminal in embodiment of this invention, Comprising: (a) shows a 1st modification, (b) shows a 2nd modification. The modification of the holder unit in embodiment of this invention is shown, (a) is a disassembled perspective view, (b) is the perspective view which looked at the 2nd surface side of the modification of an insulator. 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 modification of the jumper line in embodiment of this invention, Comprising: (a) is a wiring process, (b) shows a disconnection process.

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.
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 <b> 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 a laminate of magnetic material punched by pressing or the like in the rotational axis direction O1, and a plurality of teeth 21a around which the armature coil 22 is wound are formed radially.

  The commutator 23 is externally fitted and fixed to the rotary shaft 3, and a plurality of segments 24 made of a conductive material are attached to the outer peripheral surface thereof. The segments 24 are made of plate-like metal pieces that are long in the rotation axis direction O1, and are fixed in parallel at equal intervals along the circumferential direction in a state of 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, and is routed between the commutator 23 and the armature core 21.

  A brush 31 is in sliding contact with the segment 24 of the commutator 23. The brush 31 is in sliding contact with the segment 24 so as to supply current to the armature coil 22 via 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>
4A and 4B show the holder unit 32, where FIG. 4A is a perspective view seen from the first surface S1 side, and FIG. 4B is a perspective view seen from the second surface S2 side. FIG. 5 is an enlarged view of a portion B in FIG. 6 and 7 are exploded perspective views of the holder unit 32. FIG.
As shown in FIGS. 4 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 O <b> 1. 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 which will be described later, thereby positioning the holder unit 32 with respect to the frame portion 61 along the rotation axis direction O1.
The inner diameter of the holder base portion 36 is set to a size that allows the commutator 23 to be inserted, and 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 <b> 2). The second surface S2 is a surface facing away from the first surface S1.
The detailed configuration of the insulator 100 will be described later.

  Brush holders 41 are fixed to the second surface S2 of the brush holder stay 33 at three locations in the circumferential direction. The brush holder 41 is made of a conductive material, has a leaf spring shape extending along the rotation axis direction O1, and is urged toward the inner side in the radial direction. Specifically, the base end portion of the brush holder 41 is fixed to the holder base portion 36, and is inclined toward the inner side in the radial direction toward the distal end portion. The brush 31 is provided at the front end of the brush holder 41 so as to protrude inward in the radial direction.

  Each brush 31 has a triangular shape in a side view in which the width in the rotation axis direction O1 is gradually tapered toward the inner side in the radial direction, and the base end portion (the outer end portion in the radial direction) is fitted to the distal end portion of the brush holder 41. The tip portion (the inner end portion in the radial direction) is in sliding contact with the segment 24 of the commutator 23. As a result, 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), and the common brush 31c is the commutator 23 (rotation axis direction O1). Is disposed on the connector 34 side.

  The bridge portion 35 has a plate shape with the rotation axis direction O1 as the thickness direction, and extends from a part in the circumferential direction of the holder base portion 36 toward the outside in the radial direction. On the second surface S <b> 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 O <b> 1 and penetrates the connector base portion 51. The power terminal 55 protrudes toward the inside of the connector receiving portion 52 to function as a connector terminal, and the distal end side is exposed on the second surface S2 side of the connector base portion 51.
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. Similar to the power terminal 55, the contact plate 56 has a plate shape extending along the rotation axis direction O <b> 1 and penetrates the connector base portion 51. The contact plate 56 protrudes toward the inside of the connector receiving portion 52 to function as a connector terminal, and the contact plate 56 extends toward a worm wheel 92 described later while being bent in a crank shape.
The ground plate 57 is a ground terminal and 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 an end portion is connected to the brush holder 41 corresponding to the common brush 31c.

<Insulator>
8A and 8B are perspective views of the insulator 100, wherein FIG. 8A is a perspective view seen from the second surface T2 side, FIG. 8B is an enlarged view of a portion C in FIG. 8A, and FIG. It is the perspective view seen from the one surface T1 side.
As shown in FIGS. 8A, 8B, and 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.
The insulator 100 holds the noise prevention element 110 on the second surface T <b> 2 side opposite to the brush holder stay 33. In the insulator 100, two choke coils 111 and two capacitors 112 are disposed on the second surface T2.

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.
The insulator 100 is formed with a through hole 102 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 hole 102. The lead wire 115 such as the choke coil 111 is inserted into the through hole 102 from the second surface T2 toward the first surface T1, 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. And it connects to the terminal 130 (130A-130C) arrange | positioned at the brush holder stay 33 side.

<Terminal>
9A and 9B are views showing the first terminal 130A, where FIG. 9A is a perspective view, FIG. 9B is a cross-sectional view, and FIG. 9C is a view showing a state after laser welding.
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 130 </ b> B is a conductive member that electrically connects each brush holder 41 and the jumper wires 141 to 143. The third terminal 130 </ b> C 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> B includes a seat part 131 and a holding part 134.
The third terminal 130 </ b> 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 </ b> 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 is 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 <b> 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 <b> 2 of the brush holder stay 33.
Then, the first terminal 130 </ b> 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 <b> 2 of the brush holder stay 33.

Similarly, the terminals 130 </ b> B and 130 </ b> 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> 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 <b> 1 of the insulator 100 and the penetration exposed on the second surface S <b> 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 S <b> 1 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 sandwiched between the holding portion 134 (holding claw portion 134a) of the first terminal 130A. Moreover, the intermediate part of the jumper wires 141-143 is clamped by the holding part 134 (holding claw part 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 portion 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).
Further, 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 become a second connection 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, since each terminal 130A-130C is set to about 1.5 mm in 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 part 132, the first connection 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.

<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, and 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. As a result, the front wiper is activated so that dust, raindrops, and the like attached to the windshield can be wiped off.
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 performing the work of turning over. . 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, the top portion of the protrusion 132 becomes the first connection portion 161, and the top portion of the holding portion 134 becomes the second connection portion 162. The position of the two connection parts 162 can be kept constant.

Further, the brush holder stay 33 has a holding hole 151 that accommodates and holds the terminal 130 while exposing the first connection portion 161 and the second connection portion 162 to the first surface S1, and the terminal 130 extends from the second surface S2 side. Housed in the holding hole 151.
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.

The wiper motor 1 also includes an insulator 100 that holds the noise prevention element 110 and is superimposed on the second surface S2, and the terminal 130 is sandwiched 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 <b> 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 such 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, 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. Therefore, the assembly property of the wiring member 120 can be further improved.

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

<Variation of terminal>
FIG. 10 is a diagram illustrating a modification of the terminal 130, where (a) illustrates a first modification and (b) illustrates a second modification.
The notch 135 formed at the top of the holding part 134 is not limited to a U-shape. As shown in FIG. 10A, 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. 10B, a pair of bent portions 137 obtained by bending a part of the seat portion 131 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. 11 shows a modified example (holder unit 232) of the holder unit 32, (a) is an exploded perspective view, and (b) is a perspective view of the modified example (insulator 300) of the insulator 100 as seen from the second surface side.
FIG. 12 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 FIGS. 11 and 12, 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. 13 is a diagram illustrating a modification of the jumper wires 141 to 145, where (a) a wiring process and (b) a disconnection process.
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 sandwiched between the holding claws 134 a 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 about an increase in the number of parts and a deterioration in assembly efficiency.
Therefore, the process shown in FIG. 13 may be adopted.

First, as shown in FIG. 13A, one jumper line 140 is prepared. Jumper wire 140 is sufficiently longer than the combined length of jumper wires 141-145. 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. 13B, unnecessary portions (sections) of the jumper wire 140 are cut (disconnected). Thereby, 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 the wiper motor 1 is used for driving a rear wiper or the like, You may use it.

  In addition, in the range which does not deviate from the meaning of this invention, it is possible to replace suitably the component in the embodiment mentioned above by the known component, and you may combine the modification mentioned above suitably.

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
102 ... Through hole 110 ... Miscellaneous element 115 ... Lead wire 120 ... Wiring member 130 ... Terminal 130A ... First terminal 130B ... Second terminal 130C ... Third terminal 131 ... Seat 132 ... Projection
133 ... Through-hole 133a ... Tapered surface 134 ... Holding part 134a ... Holding claw part 135 ... Notch 140 ... Jumper wires 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 (9)

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 characterized by being made. 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 disposed at a distance of 4 mm or less in a 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, wherein the electric motor is provided.   5. The electric motor according to claim 4, wherein a dimension between a top portion of the protruding portion and a root portion of the holding claw portion is set within 1.5 mm.   6. The electric motor according to claim 4, wherein a surface of the projecting portion that receives the lead wire is 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,
7. The terminal according to claim 1, wherein the terminal is accommodated toward the holding hole from a direction in which a second surface facing the first surface of the brush holder stay faces. The electric motor described. 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.

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