JP2002233097A - Motor-driven power steering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assembling by reducing the number of the parts of an electric motor in a motor-driven power steering device. SOLUTION: In the motor-driven power steering device 10 having the electric motor 30, the yoke 52 of the electric motor 30 is made a both end-open cylindrical body, a brush holder 62 and a power supply connector 63 are made an integral molding, one end part of the yoke 52 is connected to a housing 11B, and the brush holder 62 is connected to the lower end open part of the yoke 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an electric power steering apparatus.

[0002]

2. Description of the Related Art An electric power steering apparatus is disclosed in
As described in JP-A-9-84300, an electric motor is fixed to a housing, an assist shaft of a steering device is supported on the housing, and the assist shaft is connected to a rotating shaft of the electric motor.

As described in Japanese Patent Application Laid-Open No. 8-205433, the electric motor includes a cylindrical yoke, a magnet holder having a magnet housing section formed on the inner periphery of the yoke, and a magnet housing section of the magnet holder. And a stator having a magnet to be mounted. Further, the electric motor
It has a rotor that is inserted inside the stator and fixed to the rotating shaft, a brush that is brought into contact with a commutator of the rotor, a brush holder that holds the brush, and a power supply connector that is connected to the brush.

[0004]

The prior art has the following problems. Since the yoke, the magnet holder, the brush holder, the power supply connector, and the like that constitute the electric motor are formed as separate parts, the number of parts is large, and the number of assembly steps is also large.

[0005] To connect the power supply connector to the brush,
External wiring is required, and there is difficulty in managing the power supply circuit.

[0006] Since the brush holder for holding the brush and the magnet holder for positioning the magnet of the stator are separated, a phase shift occurs in the arrangement of the brush with respect to the arrangement of the magnet of the stator, and the rotational characteristics of the motor are correct. There is a difference between the reverse direction and the reverse direction, and there is a possibility that the performance is reduced. In order to eliminate the difference between the rotation performance of the electric motor in the forward direction and the reverse direction, a performance test is performed after the electric motor is assembled, and based on the result, the brush holder is rotated to arrange the brushes. Needs to be readjusted, which impairs productivity.

Since the end plate of the electric motor is fixed by bolts in order to fix the electric motor to the housing, it is essential that the electric motor has an end plate and fixing bolts.
Large number of parts and heavy weight.

An object of the present invention is to reduce the number of parts of an electric motor in an electric power steering device and improve the assembling property.

An object of the present invention is to improve the productivity of assembling an electric motor and improve the rotation performance in an electric power steering apparatus.

An object of the present invention is to reduce the number of parts of an electric motor and reduce the weight of the electric power steering apparatus.

[0011]

According to a first aspect of the present invention, an electric motor is fixed to a housing, an assist shaft of a steering device is supported on the housing, and the assist shaft is connected to a rotating shaft of the electric motor. An electric motor, a stator including a cylindrical yoke, a magnet holder forming a magnet housing section on the inner periphery of the yoke, a magnet housed in the magnet housing section of the magnet holder, and inserted inside the stator. An electric power steering device including a rotor fixed and fixed to a rotating shaft, a brush contacting a commutator of the rotor, a brush holder for holding the brush, and a power supply connector connected to the brush. , The yoke is a cylindrical body with both ends open, the brush holder and the power supply connector are integrally formed, and one end of the yoke is connected to the housing. Combined, in which as formed by bonding the brush holder to the other end opening of the yoke.

According to a second aspect of the present invention, an electric motor is fixed to a housing, an assist shaft of a steering device is supported on the housing, and an assist shaft is connected to a rotating shaft of the electric motor. A stator having a yoke, a magnet holder forming a magnet housing section on the inner periphery of the yoke, and a magnet housed in the magnet housing section of the magnet holder, and inserted inside the stator and fixed to the rotating shaft Rotor, and a brush that is brought into contact with a commutator of the rotor, a brush holder that holds the brush, and a power supply connector that is connected to the brush.
The yoke is a cylindrical body having both ends open, the brush holder, the magnet holder and the power supply connector are integrally formed, one end of the yoke is connected to the housing, and the brush holder is connected to the other end of the yoke. Things.

According to a third aspect of the present invention, in the first or second aspect, a commutator is provided on an end face of the rotor opposite to the housing, and a power supply connector is formed on an end face of the brush holder. Things.

According to a fourth aspect of the present invention, the yoke is further press-fitted into the housing in any one of the first to third aspects of the invention.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the yoke is further screwed to the housing.

According to a sixth aspect of the present invention, the brush holder is further press-fitted into the yoke according to any one of the first to fifth aspects.

According to a seventh aspect of the present invention, in addition to any one of the first to fifth aspects, the brush holder is screwed to the yoke.

[0018]

According to the first aspect of the invention, there are the following operations (1) and (2). (1) Since the brush holder and the power supply connector constituting the electric motor are integrally formed, the number of parts can be reduced and the assembling property can be improved.

(2) Since the power supply connector is formed integrally with the brush holder, it is not necessary to draw out the wiring for connecting the power supply connector to the brush, so that the layout of the power supply circuit can be simplified and the sealing property is good.

According to the second aspect of the present invention, there are the following effects (3) to (5). (3) Since the brush holder, the magnet holder and the power supply connector constituting the electric motor are integrally formed, the number of parts can be reduced and the assembling property can be improved.

(4) Since the power supply connector is formed integrally with the brush holder, it is not necessary to draw out the wiring for connecting the power supply connector to the brush, so that the layout of the power supply circuit can be simplified and the sealing property is good.

(5) Since the magnet holder and the brush holder are integrally formed, there is no phase shift of the brush held by the brush holder with respect to the magnet of the stator positioned by the magnet holder, and the rotation performance of the motor is in the normal rotation direction. There is no difference in the reverse direction, and there is no decrease in performance. Accordingly, it is not necessary to adjust the phase of the brush arrangement at the assembly stage, and the productivity can be improved.

According to the third aspect of the present invention, the following operation (6) is provided. (6) Since the power supply connector is formed on the end face of the brush holder coupled to the other end opening of the yoke constituting the electric motor,
Compared to those that form a power supply connector on the outer periphery of the yoke,
The external shape of the electric motor including the power supply connector can be made compact.

According to the invention of claim 4, there is the following operation (7). (7) Since the yoke is press-fitted into the housing as a structure for fixing the electric motor to the housing, the electric motor does not require an end plate or fixing bolts for the end plate, thereby reducing the number of parts and reducing the weight. it can.

According to the fifth aspect of the invention, there is the following operation (8). (8) Since the yoke is screwed into the housing as a structure for fixing the electric motor to the housing, the electric motor does not require an end plate or a fixing bolt for the end plate, thereby reducing the number of parts and reducing the weight. Can be

According to the invention of claim 6, there is the following operation (9). (9) Since the brush holder is fixed to the yoke by press-fitting the brush holder into the yoke, a fixing component for the brush holder is not required and the weight can be reduced.

According to the seventh aspect of the invention, there is the following operation (10). (10) Since the brush holder is screwed to the yoke as a structure for fixing the brush holder to the yoke, the fixing parts for the brush holder are unnecessary, and the weight can be reduced.

[0028]

1 is a partially cutaway front view of an electric power steering apparatus according to a first embodiment, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 4 is a sectional view showing a modification of the electric power steering device, FIG. 5 is a sectional view showing a modification of the electric power steering device, and FIG. 6 is a sectional view showing a modification of the electric power steering device. 7 is a sectional view showing an electric power steering device according to a second embodiment, FIG. 8 is a sectional view showing a modification of the electric power steering device, FIG. 9 is a cross section showing a modification of the electric power steering device, FIG. 10 is a cross section showing a modification of the electric power steering device.

(First Embodiment) (FIGS. 1 to 6) As shown in FIGS. 1 and 2, an electric power steering apparatus 10 is a gear housing made of an aluminum alloy and fixed to a body frame or the like by a bracket (not shown). 11 (first to third
Gear housings 11A to 11C). And
Steering shaft 12 to which the steering wheel is connected
A pinion shaft 14 is connected to the pinion shaft 13 via a torsion bar 13, a pinion 15 is provided on the pinion shaft 14, and a rack shaft 16 having a rack 16A meshed with the pinion 15.
Is supported by the first gear housing 11A so as to be movable left and right. A steering torque detector 17 is provided between the steering shaft 12 and the pinion shaft 14. The steering shaft 12 and the pinion shaft 14 are formed by bearings 12A, 14A, 14B.
Through the gear housing 11.

As shown in FIG. 2, the steering torque detector 17 includes two detection coils 17A surrounding a cylindrical core 17C engaged with the steering shaft 12 and the pinion shaft 14,
17B is provided in the third gear housing 11C. The core 17C is provided with a vertical groove 17E that engages with the guide pin 17D of the pinion shaft 14 so as to be movable only in the axial direction, and has a spiral groove 17G that engages with the slider pin 17F of the steering shaft 12. As a result, the steering torque applied to the steering wheel is applied to the steering shaft 12, and when a relative displacement in the rotational direction occurs between the steering shaft 12 and the pinion shaft 14 due to the elastic torsional deformation of the torsion bar 13, the steering shaft 12 The displacement of the pinion shaft 14 in the rotation direction causes the core 17C to be displaced in the axial direction, and the displacement of the core 17C changes the inductance of the detection coils 17A and 17B due to magnetic changes around the detection coils 17A and 17B. . That is, when the core 17C moves toward the steering shaft 12, the inductance of the detection coil 17A closer to the core 17C increases, and the inductance of the detection coil 17B closer to the core 17C decreases. Can be detected.

The rack shaft 1 in the first gear housing 11A
As shown in FIG. 2, a rack guide 19 is built in a cylinder portion 18 provided at a portion opposed to the pinion 15 with one end of the bush 6 interposed therebetween.
9A) is repelled toward the rack shaft 16 by a spring 21 supported on the back surface by a cap 20 attached to the cylinder portion 18 to press the rack 16A of the rack shaft 16 against the pinion 15 and to connect one end of the rack shaft 16 to the pinion 15. It is slidably supported. The other end of the rack shaft 16 is supported by a bearing 22. In the middle part of the rack shaft 16, left and right tie rods 23A, 23 are connected by connecting bolts 22A, 22B.
B is connected.

As shown in FIG. 3, a motor case 31 of an electric motor 30 is fixed to the second gear housing 11B, and a torque limiter 8 is mounted on a rotating shaft 32 of the electric motor 30.
0 is connected to the assist shaft 33,
Are supported at both ends of the second gear housing 11B by bearings 34 and 35 such as ball bearings. The inner ring of the bearing 34 is held by a stopper ring 36A, and the outer ring is held by a lock nut 36B. A worm gear 37 is integrally provided at an intermediate portion of the assist shaft 33, and a worm wheel 38 meshing with the worm gear 37 is connected to the pinion shaft 14.
It is fixed to the middle part of. The torque generated by the electric motor 30 is applied to the rack shaft 16 as a steering assist force via the engagement between the worm gear 37 and the worm wheel 38 and the engagement between the pinion 15 and the rack 16A. To assist the steering force.

Here, the electric motor 30 is configured as follows. That is, the electric motor 30 includes a cylindrical yoke 52 formed of a magnetic material such as iron, and a magnet formed of an insulating resin material forming a magnet housing section 53 </ b> A at a plurality of circumferential positions on the inner periphery of the yoke 52. Holder 5
3 and the magnet storage section 53 of the magnet holder 53
A magnet 54 housed in A and positioned and held;
There is provided a stator 51 including a magnet cover 55 formed of an ultra-thin plate of a nonmagnetic material which is press-fitted inside a magnet 54 positioned and held by a magnet holder 53. One end of the magnet cover 55 is an enlarged diameter flange 5
5A and press-fitted into the inner periphery of the yoke 52.

The electric motor 30 has a rotor 56 inserted inside the stator 51 and fixed to the rotating shaft 32. The rotor 56 includes an amateur core 57 and a commutator 58 provided on the outer periphery of the rotating shaft 32.

The electric motor 30 has a brush 61 which is brought into contact with the commutator 58 of the rotor 56, and a brush holder 62 made of an insulating resin material for positioning and holding the brush 61. The electric motor 30
Is a brush 61 positioned and held by a brush holder 62.
And a power supply connector 63 integrally formed of an insulating resin material having the connection terminal 63A built therein.

When electric power is supplied to the electric motor 30 from the brush 61 via the commutator 58 of the rotor 56, the magnetic lines of force of the armature 57 are applied to the stator 51.
By cutting off the magnetic field generated by the magnet 54, the rotor 56 rotates.

However, the electric motor 30 has the following characteristic configuration. (1) In the electric motor 30, the yoke 52 is a cylindrical body with both ends opened, and the yoke 52 is the motor case 31.
Further, the brush holder 62 and the power supply connector 63 are integrally formed. One end of the yoke 52 is connected to the housing 11B, and the brush holder 62 is connected to the other end of the yoke 52.

(2) The electric motor 30 is provided with a commutator 58 on the end surface of the rotor 56 on the side opposite to the housing 11B, and
The brush holder 62 is connected to the opening on the 1B side. The brush holder 62 has a base portion 62A that forms an end surface that closes the opening of the yoke 52 on the side opposite to the housing 11B, and a short portion extending from the outer edge of the base portion 62A so as to be pressed into the opening of the yoke 52 on the side opposite to the housing 11B. A cylindrical portion 62B is provided, and a brush holding portion 62C is formed at a plurality of circumferential positions on the inner periphery of the short cylindrical portion 62B. The spring 64 and the brush 61 are housed in the brush holding portion 62C. The brush 61 is pressed against the commutator 58 on the end face of the rotor 56 in a direction along the axial direction of the rotor 56. In the electric motor 30, a power supply connector 63 is formed on a base portion 62A (end surface) of the brush holder 62.

(3) One end of the yoke 52 constituting the motor case 31 of the electric motor 30 is pressed into the housing 11B and fixed. That is, the first
A second spigot portion 72 externally attached to the yoke 52 (magnet holder 53, brush holder 62) constituting the motor case 31 is spigot-coupled to the spigot portion 71,
Both were tightly fixed by press-fitting at their spigot joints. At this time, between the axially intermediate portion of the first spigot portion 71 and the axially intermediate portion of the second spigot portion 72, an annular groove provided in the second spigot portion 72 (or the first spigot portion 71) is mounted. The inserted O-ring 73 is interposed.

(4) The brush holder 62 is pressed into the other end of the yoke 52 and fixed. That is, the fourth spigot part 75 provided outside the brush holder 62 was spigot-coupled to the third spigot part 74 provided inside the yoke 52, and both were press-fitted at the spigot connection part to be tightly fixed. At this time, the fourth spigot part 7 is provided between the axial middle part of the third spigot part 74 and the axial middle part of the fourth spigot part 75.
An O-ring 76 mounted on an annular groove provided in the fifth (or third spigot portion 74) is interposed.

(5) The rotary shaft 32 of the electric motor 30 and the assist shaft 33 are connected by a torque limiter 80 that slides at an impact torque exceeding a certain limit torque. The torque limiter 80 is configured by pressing a driving-side member that rotates integrally with the rotating shaft 32 and a driven-side member that rotates integrally with the assist shaft 33 by a pressing member such as a disc spring. And
Inside the torque limiter 80, for example, the fitting shaft (or fitting hole) at the tip of the rotating shaft 32 can be relatively rotated with the fitting hole (or fitting shaft) at the tip of the assist shaft 33. The rotating shaft 32 and the assist shaft 33 are made coaxial by, for example, spigot coupling, and as a result, the rotating shaft 32 is
Bearing 44 made of a ball bearing, etc.
, And is not supported at the end of the rotating shaft 32 on the assist shaft 33 side, thereby eliminating the need for a bearing. The bearing 44 can be assembled at the center of the base 62A of the brush holder 62 constituting the motor case 31.

Hereinafter, the operation of the electric power steering apparatus 10 will be described. (1) When the steering torque detected by the steering torque detecting device 17 is lower than a predetermined value, no steering assist force is required, and the electric motor 30 is not driven.

(2) When the steering torque detected by the steering torque detector 17 exceeds a predetermined value, the electric motor 30 is driven because a steering assist force is required. The torque generated by the electric motor 30 is transmitted from the rotor 56 to the worm gear 37, the worm wheel 38, the pinion 15, and the rack 16A via the rotating shaft 32, and serves as a steering assist force for the wheels linked to the rack shaft 16.

Therefore, according to the electric power steering apparatus 10 of the present embodiment, the following operations are provided.

Since the brush holder 62 and the power supply connector 63 constituting the electric motor 30 are integrally formed, the number of parts can be reduced and the assembling property can be improved.

Since the power supply connector 63 is formed integrally with the brush holder 62, it is not necessary to draw out the wiring for connecting the power supply connector 63 to the brush 61, so that the layout of the power supply circuit can be simplified and the sealing property is good.

Since the power supply connector 63 is formed on the end face of the brush holder 62 connected to the other end opening of the yoke constituting the electric motor 30, the power supply is provided as compared with the case where the power supply connector 63 is formed on the outer periphery of the yoke 52. The outer shape of the electric motor 30 including the connector 63 can be made compact.

As a structure for fixing the electric motor 30 to the housing 11B, the yoke 52 is press-fitted into the housing 11B. Therefore, the electric motor 30 does not require an end plate or a fixing bolt for the end plate, and the number of parts is reduced. Reduce and
Can be reduced in weight.

The structure for fixing the brush holder 62 to the yoke 52 is such that the brush holder 62 is press-fitted into the yoke 52, so that the fixing parts for the brush holder 62 are unnecessary and the weight can be reduced.

Further, in the present embodiment, a structure is adopted in which the rotating shaft 32 and the assist shaft 33 of the electric motor 30 are coaxially formed by, for example, spigot-coupling inside the torque limiter 80. Only the bearing 44 is supported, and the other end of the rotating shaft 32 is not supported. Thereby, the number of bearings used for the rotating shaft 32 can be reduced, and the weight can be further reduced.

The electric power steering apparatus 10 shown in FIG. 4 is different from the electric power steering apparatus 10 shown in FIGS. 1 to 3 in that one end of a yoke 52 constituting the motor case 31 of the electric motor 30 is screwed to the housing 11B. Is fixed. That is, the side of the first spigot portion 71 of the housing 11B and the yoke 5 forming the motor case 31
Screw portions 71A and 72A were provided on the sides of the second spigot portion 72 in 2, respectively, and both were spigot-joined and fastened by screwing.

The electric power steering device 10 shown in FIG. 5 differs from the electric power steering device 10 shown in FIGS. 1 to 3 in that the brush holder 62 is screwed into the opening at the other end of the yoke 52. That is, screw portions 74A and 75A are provided on the side of the third spigot portion 74 of the yoke 52 and on the side of the fourth spigot portion 75 of the brush holder 62, respectively. , Tied up.

The difference between the electric power steering device 10 of FIG. 6 and the electric power steering device 10 of FIG.
The brush holder 62 is screwed and fixed to the other end opening of the yoke 52. That is, the side adjacent to the third spigot portion 74 of the yoke 52 and the fourth spigot portion 7 of the brush holder 62.
By providing screw portions 74A and 75A on each side of 5, and spigot-connecting the two,
Fixed tight.

(Second Embodiment) (FIGS. 7 to 10) The difference between the electric power steering device 10 of FIG. 7 and the electric power steering device 10 of FIGS. 1 to 3 is that a brush holder 62 and a power supply connector 63 are further provided. The magnet holder 53 is also integrated, and the portion of the brush holder 62 which is an integrally formed body of the magnet holder 53, the brush holder 62, and the power supply connector 63 is connected to the other end opening of the yoke 52.

Therefore, according to the electric power steering apparatus 10 of the present embodiment, the following operations are provided.

Since the brush holder 62, the magnet holder 53, and the power supply connector 63 which constitute the electric motor 30 are integrally formed, the number of parts can be reduced and the assembling property can be improved.

Since the power supply connector 63 is formed integrally with the brush holder 62, it is not necessary to draw out the wiring connecting the power supply connector 63 to the brush 61, so that the layout of the power supply circuit can be simplified and the sealing property is improved.

Magnet holder 53 and brush holder 6
2 are integrally formed, so that the phase of the brush 61 held by the brush holder 62 does not deviate from the phase of the brush 54 held by the brush holder 62 with respect to the magnet 54 of the stator 51 positioned by the magnet holder 53, and the rotational performance of the motor 30 is different between the normal rotation direction and the reverse rotation direction. And no performance degradation. This eliminates the need to adjust the phase of the arrangement of the brushes 61 during the assembling stage, thereby improving productivity.

The difference between the electric power steering device 10 of FIG. 8 and the electric power steering device 10 of FIG.
A magnet holder 53 is further integrated with the brush holder 62 and the power supply connector 63.
The brush holder 62 and the power supply connector 63 are integrally formed with the brush holder 62 at the other end thereof.

The difference between the electric power steering device 10 of FIG. 9 and the electric power steering device 10 of FIG.
A magnet holder 53 is further integrated with the brush holder 62 and the power supply connector 63.
The brush holder 62 and the power supply connector 63 are integrally formed with the brush holder 62 at the other end thereof.

The electric power steering apparatus 10 shown in FIG.
6 is different from the electric power steering apparatus 10 shown in FIG. 6 in that a brush holder 62 and a power supply connector 63 are further integrated with a magnet holder 53, and the brush holder of the magnet holder 53, the brush holder 62 and the power supply connector 63 are integrally formed. That is, the portion 62 is connected to the other end of the yoke 52.

The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and changes in design and the like can be made without departing from the gist of the present invention. The present invention is also included in the present invention.

[0063]

As described above, according to the present invention, in an electric power steering apparatus, the number of parts of an electric motor can be reduced, and assemblability can be improved. Further, according to the present invention, in the electric power steering device, it is possible to improve the productivity of assembling the electric motor and improve the rotational performance. Further, according to the present invention, in the electric power steering device, the number of parts of the electric motor can be reduced and the weight can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of an electric power steering apparatus according to a first embodiment.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a sectional view showing a modification of the electric power steering device.

FIG. 5 is a sectional view showing a modification of the electric power steering device.

FIG. 6 is a sectional view showing a modification of the electric power steering device.

FIG. 7 is a sectional view showing an electric power steering device according to a second embodiment.

FIG. 8 is a sectional view showing a modification of the electric power steering device.

FIG. 9 is a cross section showing a modification of the electric power steering device.

FIG. 10 is a sectional view showing a modification of the electric power steering device.

[Explanation of symbols]

 Reference Signs List 10 electric power steering device 11B gear housing (housing) 30 electric motor 31 motor case 32 rotation shaft 33 assist shaft 51 stator 52 yoke 53 magnet holder 53A magnet storage section 54 magnet 56 rotor 57 amateur core 58 commutator 61 brush 62 brush holder 63 power supply connector 71, 72 spigot 71A, 72A screw 80 torque limiter

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 3D033 CA02 CA03 5H605 AA07 AA08 BB05 BB09 CC02 CC03 CC06 CC10 DD09 EA21 EB16 EC05 GG04 GG18 5H613 AA02 BB27 BB38 GA13 GB02 GB17 KK01 PP02 5H623 AA10 BB07 GG06

Claims (7)

[Claims] An electric motor is fixed to a housing, an assist shaft of a steering device is supported on the housing, and an assist shaft is coupled to a rotation shaft of the electric motor. The electric motor comprises: a cylindrical yoke; A stator including a magnet holder that forms a magnet housing section on the inner periphery of the yoke, and a magnet housed in the magnet housing section of the magnet holder; and a rotor that is inserted inside the stator and fixed to the rotating shaft. An electric power steering apparatus comprising: a brush that is brought into contact with a commutator of a rotor; a brush holder that holds the brush; and a power supply connector that is connected to the brush. One end of the yoke is connected to the housing, and the other end of the yoke is An electric power steering device characterized by combining a brush holder. 2. An electric motor is fixed to a housing, an assist shaft of a steering device is supported on the housing, and an assist shaft is connected to a rotating shaft of the electric motor. The electric motor comprises: a cylindrical yoke; A stator including a magnet holder that forms a magnet housing section on the inner periphery of the yoke, and a magnet housed in the magnet housing section of the magnet holder; and a rotor that is inserted inside the stator and fixed to the rotating shaft. An electric power steering apparatus comprising: a brush that is brought into contact with a commutator of a rotor; a brush holder that holds the brush; and a power supply connector that is connected to the brush. The brush holder, magnet holder, and power supply connector are integrally formed, and one end of the yoke is connected to the housing. An electric power steering device comprising a brush holder connected to an opening of the other end of the work. 3. The electric power steering apparatus according to claim 1, wherein a commutator is provided on an end surface of the rotor opposite to the housing, and a power supply connector is formed on an end surface of the brush holder. 4. The electric power steering apparatus according to claim 1, wherein the yoke is press-fitted into the housing. 5. The electric power steering apparatus according to claim 1, wherein the yoke is screwed to the housing. 6. The electric power steering apparatus according to claim 1, wherein the brush holder is press-fitted into the yoke. 7. The electric power steering apparatus according to claim 1, wherein the brush holder is screwed to the yoke.