JPH08111967A - Motor - Google Patents

Abstract

PURPOSE: To improve the heat radiating property of a motor while its brush holder stay is positioned and the alignment between its commutator and brush holder is secured. CONSTITUTION: A plus-side brush holder 52 and minus-side brush holder 53 are formed of a conductive material having thermal conductivity and a bottomed cylindrical insulator 17 formed of an insulating material is put in the brush holder housing chamber 16 of a housing 2. In addition, a brush holder stay 32 which holds both brush holders in an insulating state is fixed ire the pipe of the insulator 17. A plus-side terminal member 62 and minus-side terminal member are formed of a conductive material having thermal conductivity and passed through the insulator 17 so that the members can be insulated from the housing 2. Therefore, the heat generated from brushes and commutator can be efficiently radiated, because the heat is conducted to each lead wire through both brush holders and both terminal members and further conducted to the housing 2 through the stay 32 and insulator 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly,
The present invention relates to an improvement in the structure around a brush holder and, for example, to a technique effectively applied to an on-vehicle DC motor that is driven in forward and reverse rotation.

[0002]

2. Description of the Related Art In an on-vehicle DC motor, in order to improve productivity, it is common to integrally mold a brush holder and a brush holder stay for supporting the brush holder stay using an insulating resin. Have been implemented. In this case, in order to prevent the brush holder and the brush holder stay from being deformed by heat generated between the brush and the commutator and between the brush and the commutator, it is necessary to use a resin having high heat resistance. Therefore, generally, a structure is considered in which the brush holder and the brush holder stay are each made of metal, and the brush holder stay is supported by being floated in the motor housing so as to secure an insulating gap.

[0003]

However, in the structure in which the brush holder stay is supported in a floating state on the motor housing, the heat transfer coefficient between the brush holder stay and the motor housing is lowered, so that the heat radiation performance is reduced. It not only lowers the position of the brush holder stay,
There is a problem that it is not possible to ensure the alignment of the commutator and the brush holder.

An object of the present invention is to provide a motor capable of enhancing the heat radiation performance while ensuring the positioning of the brush holder stay and the alignment of the commutator and the brush holder.

[0005]

A motor according to the present invention comprises:
The plus-side brush holder and the minus-side brush holder are made of materials with good thermal conductivity, and the brush holder housing is made of an insulating material and has a bottomed cylindrical shape. An insulator is fitted in, and a brush holder stay that supports the plus side brush holder and the minus side brush holder in an insulated state from each other is fixed in the cylinder of the insulator, and further, the plus side terminal member and the minus side The terminal members are each formed of a conductive material having a good thermal conductivity, and are penetrated through the insulator while being insulated from the housing.

[0006]

According to the above-mentioned means, the heat generated between the brush and the commutator and between the brush and the commutator is generated by the plus-side brush holder and the terminal member and the minus-side brush holder and the terminal member, which have good thermal conductivity. The heat is conducted to each of the lead wires via the lead wire, so that it is released very efficiently.

On the other hand, since the brush holder stay is fixed to the bottomed tubular insulator fitted in the housing and is supported without floating in the housing, the brush holder stay is positioned with respect to the housing, and the commutator and the brush. The alignment with the holder will be ensured.

[0008]

1 is a vertical sectional view showing a motor according to an embodiment of the present invention. FIG. 2 shows an assembly of the brush holder stay, (a) is a plan view, (b) is (b) of (a).
-B is a sectional view taken along line b, FIG. 3A is a bottom view thereof, and FIG.
FIG. 3 is a sectional view taken along line III-III in FIG. FIG.
Shows an insulator, (a) is a plan view,
5B is a sectional view taken along line bb of FIG. 5A, FIG. 5A is a bottom view thereof, and FIG. 5B is a sectional view taken along line VV of FIG. 4A.

In the present embodiment, the motor according to the present invention is configured as an on-vehicle DC motor (hereinafter referred to as a motor) 1 which is driven to rotate in forward and reverse directions, and has a substantially cylindrical housing 2 whose both end surfaces are closed. Is equipped with. The housing 2 is made of a steel plate or the like and is integrally formed into a cylindrical shape having one end opened by press working, and the end is integrally formed into a short cylindrical shape of which one end is opened by die casting using aluminum or the like. A bracket (hereinafter referred to as a bracket) 4 is provided, and the bracket 4 is put on the opening end of the yoke 3 to form a housing 2 as a hermetic container. York 3
Further, bearing housing chambers 5 and 6 are concentrically arranged on the closing wall of the bracket 4 and are bulged into a cylindrical shape. Rolling bearings 7 and 8 are fitted into both bearing chambers 5 and 6, respectively. Has been done. The bearing 7 fitted in the bearing accommodating chamber 5 of the yoke 3 is prevented from falling off by the stopper plate 9.

The motor 1 is provided with a shaft 10 as an output shaft that rotates in the normal and reverse directions. A commutator 11 and an armature 12 are fixedly mounted on the shaft 10 so as to be adjacent to each other in order from one end. Shaft 10 is a commutator 1
One end is fitted in the bearing 8 of the bracket 4 and the other end is fitted in the bearing 7 of the yoke 3 and rotatably supported by the housing 2. The end of the shaft 10 on the yoke 3 side penetrates through an insertion hole 14 formed in the bottom wall of the yoke 3 and is projected to the outside. A pinion 13 for cooperating with a vehicle-mounted load is provided at the projecting end. Has been formed. The commutator 11 is arranged in the brush holder storage chamber 16 formed by the hollow cylinder portion of the bracket 4, and the armature 12 is arranged in the hollow cylinder portion of the yoke 3.
A plurality of magnets 15 as field poles are fixed to the inner peripheral surface of the yoke 3 so as to surround the armature 12 at intervals in the circumferential direction.

In the brush holder accommodating chamber 16, a bottomed cylindrical insulator 17 integrally formed by using an insulating resin is fitted with its bottom side facing the bottom side of the accommodating chamber 16. . Closure wall 18 of insulator 17
The insertion holes 19 are concentrically arranged and integrally formed therewith, and the male seal cage coupling portion 20 is provided on the opening edge of the insertion hole 19 so as to project outward in the axial direction. The male inro cage connecting portion 20 is concentrically arranged on the inner surface of the closing wall of the bracket 4 and is inrobe coupled to the female inro cage connecting portion 21 which is provided so as to project inward in the axial direction. The female stamp joint 21 is formed in the same circle by cutting together with the bearing housing 6 of the bracket 4. Therefore, the insulator 17 is accurately aligned with the bearing 8, and the insulator 17 and the shaft 10 are aligned with each other.

A pair of terminal member insertion holes 22 are arranged in the closing wall 18 of the insulator 17 at positions 180 degrees apart from each other and are opened in the axial direction, and both insertion holes 22 and 22 close the bracket 4. The terminal member insertion holes 23 formed in the respective parts are opposed to each other. Further, a pair of through bolt insertion holes 24 are formed in the closing wall 18 of the insulator 17 and are separated from each other by 180 degrees,
Moreover, the through holes 24, 24 are respectively provided at positions 90 degrees apart from the terminal member insertion holes 22, 22 and are opened in the axial direction. The through holes 24, 24 are through bolts respectively opened at the closed portions of the bracket 4. The insertion holes 25 are opposed to each other.

The height of the cylindrical wall 26 of the insulator 17 is set higher than the height of the cylindrical wall of the bracket 4, and an outer step portion 27 is formed on the outer peripheral surface of the cylindrical wall 26 at the height of the cylindrical wall of the bracket 4. It is formed at the corresponding position.
When the bracket 4 is placed over the opening of the yoke 3, the tip end surface of the cylindrical wall 26 of the insulator 17 is in a state of being close to the end surface of the magnet 15 fixed to the inner peripheral surface of the yoke 3.

At positions corresponding to both through bolt insertion holes 24, 24 in the cylindrical wall 26 of the insulator 17,
Each guide tube portion 28 is integrally formed.
A through bolt (not shown) for fixing the motor 1 to the vehicle body or the like is passed through the insertion hole 25 of the bracket 4 and the insertion hole 24 of the insulator 17, and the through bolt insertion hole 29 opened in the closed portion of the yoke 3. When it is inserted into the through hole 29, the guide tube portion 28 is easily inserted into the insertion hole 29 on the yoke side by guiding the through bolt.

An inner step portion 30 is formed on the inner peripheral surface of the cylindrical wall 26 of the insulator 17 at a position facing the outer step portion 27, and a brush holder stay to be described later is fitted into the cylindrical wall 26 of the insulator 17. In this state, the step portion 30 is in a state of engaging with the outer peripheral edge of the one end surface of the brush holder stay. Also,
A pair of engaging claws 31 are provided on the inner peripheral surface of the cylindrical wall 26 of the insulator 17, and are arranged at 180 ° intervals in the circumferential direction at positions spaced apart from the inner step portion 30 by a predetermined distance so as to project radially inward. When the step portion 30 is engaged with the outer peripheral edge of the one end surface of the brush holder stay, each engaging claw 31 engages with the outer peripheral edge of the opposite surface of the brush holder stay, whereby the brush holder stay is engaged. Is held in cooperation with the step portion 30.

The brush holder stay 32 fitted and held in the hollow cylindrical portion of the insulator 17 is made of a resin having an insulating property and is integrally formed into a flat plate shape having a donut shape in plan view. A positive side conductive plate and a negative side conductive plate, which are formed by using a conductive thin plate and are respectively in contact with the second main surface of the base, are provided. A commutator insertion hole 34 is formed by the central hole of the base 33, and a plurality of caulking holes 35 for caulking the brush holder are formed around the commutator insertion hole 34 of the base 33 so as to be regularly arranged in the circumferential direction. ing. That is, a plurality of caulking holes 35 are arranged as one set, and each group is arranged at intervals of 90 degrees in the circumferential direction. The pair of caulking holes 35, 35 are formed by caulking claws of a brush holder described later. The openings are provided so as to be opposed to each other with a space therebetween and to extend in the radial direction.

A positive side terminal member insertion hole 36 and a negative side terminal member insertion hole 37 are provided 180 degrees apart from each other in the circumferential direction between the caulking holes 35 of two adjacent sets of the base 33. ing. In addition, a pair of positive side notches 38 are provided on the inner periphery of the commutator insertion hole 34 of the base 33 at positions that are 180 degrees apart from each other in the circumferential direction, and are 90 degrees apart from both terminal member insertion holes 36 and 37 in the circumferential direction. It is located in the open position and has a square shape. Further, a pair of minus side notches 39 are provided on the outer periphery of the base 33 at positions that are 180 degrees apart from each other in the circumferential direction and that are far from the terminal member insertion holes 36 and 37 so as not to interfere in the circumferential direction. It has been opened in a substantially square shape.

The positive-side conductive plate 40 is formed in a small-width large circular ring shape having an inner diameter substantially equal to the diameter of the commutator insertion hole 34 of the base 33 and an outer diameter sufficiently smaller than the outer diameter of the base 33. The second main surface of the base 33 is concentrically arranged and is in contact with the second main surface. A pair of substantially rectangular plus side brush holder connecting portions 41 are arranged on the outer circumference of the plus side conductive plate 40 at positions 180 degrees apart from each other in the circumferential direction and project outward in the radial direction. The two pairs of caulking holes 35 formed in the base 33 correspond to two sets and are inserted between the pair of caulking holes 35. A positive side terminal member connecting portion 42 is provided on the outer circumference of the positive side conductive plate 40 at a position corresponding to the positive side terminal member insertion hole 36 of the base 33 so as to project radially outward. The terminal member insertion hole 43 is opened so as to coincide with the insertion hole 36 of the base. Further, a plus side pigtail connecting portion 44 is formed at each position corresponding to each plus side cutout portion 38 of the base 33 in the plus side conductive plate 40, and each connection portion 44 has a pigtail in the cutout portion 38. Can be welded by spot welding.

The minus side conductive plate 45 is a plus side conductive plate 4.
It is formed in a substantially circular ring shape having an inner diameter larger than the outer diameter of 0 and an outer diameter equal to the inner diameter of the inner stepped portion 30 of the insulator 17, and the plus-side conductive plate is formed on the second main surface of the base 33. Outside of 40, they are arranged concentrically and abutted. A pair of substantially rectangular minus side brush holder connecting portions 46 are provided on the inner circumference of the minus side conductive plate 45 at positions 180 degrees apart from each other in the circumferential direction, and the plus side conductive plate 4 is provided.
0 connecting portions 41, which are arranged at a position 90 degrees apart from the connecting portions 41, and project radially inward, and each connecting portion 46 corresponds to two sets of caulking holes 35 group formed in the base 33. Then, it is designed to be inserted between the pair of caulking holes 35, 35. At the position corresponding to the minus side terminal member insertion hole 37 of the base 33 on the inner circumference of the minus side conductive plate 45, a minus side terminal member connecting portion 47 is provided so as to project radially inward. Is formed such that the terminal member insertion hole 48 is aligned with the insertion hole 37 of the base. Furthermore, the negative side conductive plate 45
In the respective positions corresponding to the respective minus side notches 39 of the base 33 in FIG.
9 are formed respectively, and each connection part 49 has a cutout 3
The pigtails can be welded by spot welding within 9.

On the outer periphery of the minus side conductive plate 45, an escape recess 5 for escaping the guide cylinder 28 of the insulator 17.
A pair of 0s are arranged at positions 180 degrees apart from each other in the circumferential direction, and are formed inward in the radial direction in a substantially triangular shape. Further, similar escape recesses 51, 51 are formed respectively corresponding to both escape recesses 50, 50 of the base 33.

A pair of plus side brush holders 52 and minus side brush holders 53 are mounted on the brush holder stays 32 thus constructed. Since the plus side brush holder 52 and the minus side brush holder 53 have the same configuration, the configuration will be representatively described for the single brush holder 52.

The brush holder 52 is made of a conductive metal material and is integrally formed by press working, and has one end face (hereinafter referred to as the front face) and one side face (hereinafter referred to as the bottom face). It is provided with a main body 54 formed in a rectangular box shape having an opening. Caulking claws 55 project outward from the lower ends of the left and right side surfaces of the body 54, and the caulking claws 55 are formed so as to be inserted into the caulking holes 35 of the base 33. At least one of the left and right side surfaces of the main body 54 has a pigtail insertion hole 56.
Is formed in a long hole shape having an opening at the front end. The brush holder 52 is the brush holder stay 3
2, the lower surface of the main body 54 is brought into contact with the first main surface of the base 33, the respective caulking claws 55 are inserted into the respective caulking holes 35, and the respective caulking claws 55 are folded back on the second main surface of the base 33. It is fixed by that. A brush spring 57 and a brush 58 are accommodated in the brush holder main body 54 in order from the back side, and a pigtail 59 having one end thereof planted in the brush 58 is inserted through an insertion hole 56 and pulled out to the outside.

Since the caulking claw 55 comes into contact with the plus side brush holder connecting portion 41 in the caulked state, a pair of plus side brush holders 52,
52 is in a state of being electrically connected to each other through the positive side conductive plate 40. Further, since the caulking claw 55 is in a state of being in contact with the minus side brush holder connecting portion 46 in the state where the caulking process is performed, the pair of minus side brush holders 53, 53 are electrically connected to each other via the minus side conductive plate 45. It will be in the state of being. Furthermore, each caulking claw 55
Holds the connection portions 41, 46 and the base 33, so that the positive side conductive plate 40 and the negative side conductive plate 4 are
5, the base 33 and the brush holders 52 and 53 are relatively integrated.

The pigtails 59, 59 of the pair of plus-side brush holders 52 are electrically connected to the plus-side pigtail connecting portions 44, 44 of the plus-side conductive plate 40 by spot welding portions 60, 60 on the first main surface side of the base 33, respectively. Connected to each other. Further, the pigtails 59, 59 of the pair of minus side brush holders 53 are connected to the minus side pigtail connecting portions 49, 4 of the minus side conductive plate 45.
9, the spot welded portion 6 on the first main surface side of the base 33
1, 61 are electrically connected to each other.

In this way, the plus side terminal member 62 and the minus side terminal member 63 are fixed to the brush holder stay 32 on which the brush holders 52 and 53 are mounted. Since the plus side terminal member 62 and the minus side terminal member 63 have the same configuration, the configuration will be representatively described for the plus side terminal member 62.

The plus-side terminal member 62 has a body 64 formed in a rod shape, and male screw portions 65 and 66 are formed on both ends of the body 64, respectively. Body 6
4 is formed with a double-sided width portion 67 at the base end portion of one of the male screw portions 65. The male screw portion 65 is inserted into the terminal member insertion holes 36 and 43 of the brush holder stay 32 on the first main surface side of the base 33. Has been inserted from. Male screw part 6 inserted
A nut 68 is screwed to the No. 5 on the second main surface side of the base 33 via a washer 69. In this way, the terminal member 62 is fixed to the brush holder stay 32 by being sandwiched between the nut 68 and the washer 69 and the two-face width portion 67.

Since the nut 68 and the washer 69 of the plus side terminal member 62 and the width across flats 67 sandwich the plus side terminal member connecting portion 42 of the plus side conductive plate 40, the plus side terminal member. 62 is in a state of being electrically and thermally conductively connected to the positive side conductive plate 40. Also, the nut 68 and the washer 69 of the minus side terminal member 63 and the width across flat 67
Since and are sandwiching the minus side terminal member connecting portion 47 of the minus side conductive plate 45, the minus side terminal member 63 is electrically and thermally conductively connected to the minus side conductive plate 45. ing.

In this way, the plus side terminal member 6
2 and the minus side terminal member 63 are assembled to the brush holder stay 32 in the insulator 17,
Both terminal members 62 and 63 are inserted and accommodated in both terminal member insertion holes 22 and 22, respectively. In this housed state, the outer peripheral surface of the minus-side conductive plate 45 of the brush holder stay 32 is the cylindrical wall 2 of the insulator 17.
6, the outer peripheral edge of the brush holder stay 32 is engaged with the inner step portion 30, and the outer peripheral edge of the engaging claw 31 is engaged. Is in a state of being positioned and centered on the insulator 17.

The insulator 17 to which the brush holder stay 32 is assembled is fitted in the opening of the yoke 3 with the outer circumference of the cylindrical wall 26 abutting against the inner circumference of the yoke 3. The bracket 4 is accommodated in the opening of the yoke 3 into which the insulator 17 is fitted, the insulator 17 is accommodated in the brush holder accommodating chamber 16, and the plus side terminal member 62 and the minus side terminal member 63.
Are covered so as to be inserted into both insertion holes 23, 23.

The terminal member holders 70 are fitted and mounted in the insertion holes 23 of the bracket 4, respectively, to the plus side terminal members 62 and the minus side terminal members 63 projecting from the insertion holes 23 to the outside. 70
Is in a state in which both terminal members 62 and 63 are insulated and held from the bracket 4. That is, the terminal member holder 70 is integrally formed by using an insulating resin and has a main body 71 formed in a substantially cylindrical shape. One end of the main body 71 (hereinafter referred to as the lower end)
A disk-shaped portion 72 is formed so as to close the lower end surface, and an insertion hole 73 through which the terminal member is inserted is formed at the center of the disk-shaped portion 72. Disk shaped part 72
A positioning protrusion 74 fitted into the insertion hole 23 of the bracket 4 is provided on the lower surface of the above so as to project in a circular ring shape around the insertion hole 73. The housing portion 75 is formed by the hollow cylindrical portion of the main body 71.

Then, in the accommodation portion 75 of the terminal member holder 70, the nuts for fastening lead wires (not shown) to the male screw portions 66, 66 of the plus side terminal member 62 and the minus side terminal member 63. 7
6 are screwed together via respective washers 77.

Here, in the assembling work of the insulator 17 and the bracket 4 to the yoke 3, there is a period from the assembling of the insulator 17 to the yoke 3 until the nuts 76 and 76 are screwed into the terminal members 62 and 63. The insulator 17 may fall into the yoke 3. However, when the cylindrical wall 26 of the insulator 17 is set to a predetermined height, the tip end surface of the cylindrical wall 26 comes into contact with the facing end surface of the magnet 15 of the yoke 3, so that both terminal members 62, 63 are attached to the bracket 4. The protruding state from both insertion holes 23, 23 can be maintained. Then, both terminal members 62 and 63 are attached to the nut 7.
When tightened by 6, 76, the insulator 1
7 is pulled toward the bracket 4, and the outer step portion 27 of the insulator 17 is engaged with the opening end surface of the bracket 4, so that the insulator 17, the bracket 4,
Both terminal member holders 70 and both terminal members 6, 63 are in a relatively integrated state.

The yoke 3 and the bracket 4 are integrated by a locking claw (not shown) formed by caulking a part of the opening end of the yoke 3. In this state, the end of the shaft 10 on the side of the bracket 4 is fitted into the bearing 8, and each brush 58 is attached to the commutator 11.
Is pressed against the predetermined position by the urging force of the brush spring 57.

Next, the heat radiation effect will be described. When the motor 1 configured as described above is operated, each brush 5
8 and commutator 11 and brush 58 and commutator 11
Fever between. All of these heat generations are positive and negative brush holders 52 and 53, pigtails 59 and 59, conductive plates 40 and 45, and terminal members 62, which are formed by using a conductive metal material having good thermal conductivity. , 63, and the heat is conducted to the plus side and the minus side lead wires respectively, so that it is released very effectively. Moreover, since the negative side conductive plate 45 is in direct contact with the insulator 17 and the positive side conductive plate 40 is in indirect contact with the insulator 17 via the base 33, the heat of the two conductive plates 45, 40 is heat. Since the heat is transferred to the housing 2 via the insulator 17 by conduction, the heat is radiated to the housing 2 with a higher heat transfer coefficient than in the conventional example in which an air layer is interposed.

According to the above embodiment, the following effects can be obtained. (1) Each brush 58, commutator 11 and brush 5
The heat generated between the commutator 11 and the commutator 11 is made of a conductive material having good thermal conductivity, and the brush holders 52 and 53 on the plus and minus sides, the conductive plates 40 and 45, and the terminals are formed. Since the heat is conducted to the plus and minus side lead wires via the members 62 and 63, respectively, and the heat of the conductive plates 45 and 40 also passes through the insulator 17, so that the housing 2 has a high heat transfer coefficient. Therefore, the heat dissipation performance of the motor as a whole can be greatly improved.

(2) The brush holder stay 32 is a bottomed cylindrical insulator 17 fitted in the housing 2.
By fixing the brush holder stay 32 to the housing 2 without being floated, the positioning of the brush holder stay 32 with respect to the housing 2 and the alignment of the commutator 11 and the brush holders 52, 53 can be secured. .

(3) Cylindrical wall 26 of the insulator 17
Since the guide cylinders 28 are integrally formed at positions corresponding to both through bolt insertion holes 24, 24 of the bracket 4, through bolts for attaching the motor 1 to the vehicle body or the like are formed in the insertion holes of the bracket 4. 25 and the insertion hole 24 of the insulator 17 and the through bolt insertion hole 29 opened in the closed portion of the yoke 3, the guide tube portion 28 guides the through bolt to insert the insertion hole 29 on the yoke side. Can be easily inserted.

(4) Cylindrical wall 26 of insulator 17
Is set to be larger than the depth of the bracket 4, so that the tip end surface of the cylindrical wall 26 is brought into contact with the end surface of the yoke 3 facing the magnet 15 when the insulator 17 and the bracket 4 are assembled to the yoke 3. Since it is possible to prevent the insulator 17 from falling into the yoke 3, both the terminal members 62,
The protruding state from both insertion holes 23 of the bracket 4 of 63 can be maintained.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the scope of the invention.

For example, in the above embodiment, the case where two plus side brush holders and two minus side brush holders are provided has been described. However, the present invention has one plus side brush holder and one minus side brush holder. Alternatively, it can be applied to the case of three or more. When there is one plus side brush holder and one minus side brush holder, the conductive plate can be omitted and each terminal member can be directly connected to each brush holder.

[0041]

As described above, according to the present invention,
While ensuring the positioning of the brush holder stay in the motor and the alignment of the commutator and brush holder,
The heat dissipation performance of the motor can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a motor according to an embodiment of the present invention.

2A and 2B show an assembly of the brush holder stay, wherein FIG. 2A is a plan view and FIG. 2B is a sectional view taken along line bb of FIG.

FIG. 3 (a) is a bottom view thereof, and FIG. 3 (b) is II of FIG. 2 (a).
It is sectional drawing which follows the I-III line.

4A and 4B show an insulator, FIG. 4A is a plan view, and FIG. 4B is a sectional view taken along line bb of FIG.

5A and 5B show an insulator, in which FIG. 5A is a bottom view and FIG. 5B is a cross-sectional view taken along the line VV of FIG.

[Description of sign]

1 ... In-vehicle DC motor (motor), 2 ... Housing, 3
... Yoke, 4 ... End bracket, 5, 6 ... Bearing accommodating chamber, 7, 8 ... Rolling bearing, 9 ... Stopper plate, 10
… Shaft, 11… Commitator, 12… Armature,
13 ... Pinion, 14 ... Insertion hole, 15 ... Magnet, 1
6 ... Brush holder storage chamber, 17 ... Insulator, 18
... Blocking wall, 19 ... Insertion hole, 20 ... Male inro cage connecting part, 21 ...
Female cage joint part, 22 ... Terminal member insertion hole, 23 ... Terminal member insertion hole, 24 ... Through bolt insertion hole, 25
... Through bolt insertion hole, 26 ... Cylindrical wall, 27 ... Outer step portion, 28 ... Guide tubular portion, 29 ... Through bolt insertion hole, 3
0 ... inner step, 31 ... engaging claw, 32 ... brush holder stay, 33 ... base, 34 ... commutator insertion hole, 35 ...
Caulking hole, 36 ... Positive side terminal member insertion hole, 37
... minus side terminal member insertion hole, 38 ... plus side cutout part, 39 ... minus side cutout part, 40 ... plus side conductive plate, 41 ... plus side brush holder connection part, 42 ... plus side terminal member connection part, 43 ... terminal Member insertion hole, 44 ... Plus side pigtail connection part, 45 ... Negative side conductive plate, 46 ... Minus side brush holder connection part, 47
… Minus side terminal member connection part, 48… Terminal member insertion hole, 49… Minus side pigtail connection part, 5
0, 51 ... Escape recess, 52 ... Plus side brush holder, 5
3 ... Minus side brush holder, 54 ... Main body, 55 ... Caulking claw, 56 ... Pigtail insertion hole, 57 ... Brush spring, 58 ... Brush, 59 ... Pigtail, 60 ... Spot weld, 61 ... Spot weld, 62 ... Plus Side terminal member, 63 ... Minus side terminal member, 64 ... Main body, 65, 66 ... Male screw portion, 67 ... Width across flat portion, 68 ... Nut, 69 ... Washer, 70 ... Terminal member holder,
71 ... Main body, 72 ... Disk shaped portion, 73 ... Insertion hole, 74 ...
Positioning convex portion, 75 ... accommodation portion, 76 ... nut, 77 ... washer.

Front page continuation (72) Inventor ▲ Kuwa ▼ Masami Hara 1-2681 Hirosawa-cho, Kiryu-shi, Gunma Stock Company Mitsuba Electric Manufacturing Co., Ltd. (72) Inventor Yoshihiro Sudo 1261 Hirosawa-cho, Kiryu-shi Company Mitsuba Electric Mfg. Co., Ltd. (72) Inventor Akira Sasaki 1-2681 Hirosawa-cho, Kiryu-shi, Gunma Stock Mitsuba Electric Mfg. Co., Ltd.

Claims (1)

[Claims] 1. A commutator is fixed to the outer periphery of a shaft rotatably supported by a housing, and a plus side brush and a minus side brush are provided in a brush holder accommodating chamber formed so as to surround the commutator in this housing. In the motor in which each of the brush holders held by the brush holder is disposed, and the brush holder is electrically connected to the plus-side terminal member and the minus-side terminal member and is drawn out of the housing, The brush holder and the minus side brush holder are each formed of a material having good thermal conductivity, and the brush holder accommodating chamber is made of an insulating material and is formed into a bottomed cylindrical shape. Is inserted in the cylinder of this insulator. A brush holder stay supporting the brush holder and the minus side brush holder in an insulated state is fixed, and the plus side terminal member and the minus side terminal member are made of a conductive material having good thermal conductivity. A motor that is formed respectively and penetrates through the insulator while being insulated from the housing.