JP2012231571A - Brush holding device for motor and steering device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brush holding device for a motor that can suppress noise caused by vibration of a brush.SOLUTION: In this brush holding device, a brush holder 40 comprising a rectangular cylindrical body for storing a brush and a coil spring that energizes the brush comprises: a holder body 60 having a U-shaped cross section; and a holder stay 70 disposed on inner sides of both side walls 61, 62 of the holder body 60 and closing a bottom of the holder body 60. The brush is held by the brush holder 40. The holder stay 70 includes two pairs of extension portions 73-76 which extend from a base portion 71 to outer sides of the side walls 61, 62 of the holder body 60, respectively and are bent to nip and press outer faces of the side walls 61, 62 from both sides, respectively.

Description

  The present invention relates to a motor brush holding device and a vehicle steering device using the motor brush holding device.

  Conventionally, a motor with a brush is used as a drive source in a vehicle steering apparatus. This motor has a structure in which a brush is slidably pressed against a commutator that rotates integrally with the armature, and is driven by supplying power from the brush to the armature via the commutator. Conventionally, for example, an apparatus described in Patent Document 1 is known as an apparatus for holding a brush in such a motor.

  As shown in FIG. 10, in this brush holding device, a holder body 80 and a holder stay 90 constitute a brush holder 100 made of a rectangular cylinder, and a brush is accommodated therein. Then, after engaging portions 85 and 86 formed on the bottom of the holder main body 80 are inserted into the through holes 102 and 103 formed on the substrate 101, their tips are bent, so that the brush holder 100 is mounted on the substrate 101. Fixed to. In addition, at the four corners of the bottom of the holder main body 80, protrusions 81 to 84 to be inserted into the recesses 91 to 94 formed in the holder stay 90 are formed. As shown in FIG. 11, in this brush holding device, the protrusions 82 and 84 are in contact with the inner surfaces of the recesses 92 and 94, respectively. Thereby, since the spread to the outer side of the holder main body 80 is regulated, a desired gap can be secured between the inner surface of the holder main body 80 and the brush. Therefore, even if the brush accommodated in the brush holding device vibrates with the rotation of the commutator, it becomes difficult for the brush to come into contact with the holder main body 80, so that the generation of noise due to the vibration of the brush can be reduced. It becomes like this.

JP 2003-88051 A

  By the way, the brush holding device illustrated in FIGS. 10 and 11 is designed so that the protrusions 82 and 84 can be inserted into the recesses 92 and 94 in consideration of the dimensional tolerances of the holder main body 80 and the holder stay 90. Is done. Specifically, the protrusions 82 and 84 having the maximum dimensional tolerance of the plate thickness H can be inserted into the recesses 92 and 94 having the minimum dimensional tolerance of the width C shown in FIG. The design is done. However, in such a design, when the protrusions 82 and 84 having the minimum dimensional tolerance of the plate thickness H are inserted into the recesses 92 and 94 having the maximum dimensional tolerance of the width C, the holder A large gap is formed between the main body 80 and the holder stay 90. When such a gap is formed, the variation in the width of the holder main body 80 increases, and the gap between the brush and the brush holder 100 is too wide or narrower than the desired gap. As a result of this vibration, the brush holder 100 is likely to vibrate and abnormal noise is generated.

  The present invention has been made in view of such circumstances, and an object of the present invention is to use a brush holding device for a motor capable of suppressing the generation of noise caused by vibration of the brush, and the brush holding device for this motor. The object is to provide a vehicle steering system.

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a brush holder comprising a rectangular cylindrical body that accommodates a brush of a motor and a biasing means for biasing the brush includes a biasing direction of the brush. The brush holder is formed by a holder main body having a U-shaped cross-section in a direction orthogonal to the holder main body, and a holder stay disposed inside the opposite side walls of the holder main body and closing the opening of the holder main body. In the brush holding device of the motor configured to hold the brush by the above, the holder stay extends from the base portion disposed inside the both side walls of the holder body to the outside of the both side walls of the holder body. The gist is that a pair of pressing portions bent so as to sandwich and press the outer surfaces of both side walls from both sides are provided.

  According to this configuration, the both side walls of the holder main body are sandwiched and pressed by the pair of pressing portions, so that the both side walls of the holder main body are held in contact with the base portion of the holder stay located inside them. . For this reason, the distance between both side walls of the holder body is regulated by the width of the base part, regardless of dimensional tolerances other than the base part of the holder body and the holder stay. Thereby, since the dimensional accuracy of the clearance gap between a brush and a brush holder is improved, generation | occurrence | production of the noise accompanying brush vibration can be suppressed now.

  According to a second aspect of the present invention, in the motor brush holding device according to the first aspect, the pressing portion has a portion extending outward from the side wall of the holder body from the base portion on the side wall of the holder body. A first bent portion formed by bending so as to face each other and a portion extending from the first bent portion are bent toward the side wall of the holder main body to apply a pressing force to the side wall. The gist is to have a second bent portion as a part.

  According to this configuration, since the second bent portion, which is a portion that applies a pressing force to the side wall of the holder body, is firmly held by the first bent portion, a sufficient pressing force can be applied to the side wall of the holder body. it can. Moreover, the force which presses the side surface of a holder main body can also be easily adjusted only by changing the shape of a 2nd bending part suitably. Therefore, since the dimensional accuracy of the gap between the brush and the brush holder can be further increased, the generation of abnormal noise can be more accurately suppressed.

And in this case, as in the invention according to claim 3,
-The width | variety of the said 1st bending part is set wider than the width | variety of the said 2nd bending part.
Or according to the invention according to claim 4,
The first bent portion is formed by being bent in a direction parallel to the side wall of the holder body or in a direction closer to the side wall of the holder body than parallel.
It is effective to adopt such a configuration, whereby the second bent portion can be firmly held by the first bent portion.

  According to a fifth aspect of the present invention, in the brush holding device for a motor according to any one of the second to fourth aspects, when the upper wall is a portion provided to connect the both side walls in the holder body. The second bent portion is formed by bending a portion extending from the first bent portion toward the upper wall of the holder main body toward the side wall of the holder main body.

  According to this configuration, the direction in which the holder main body is assembled to the holder stay matches the bending direction of the second bent portion. Therefore, when the holder main body is assembled to the holder stay, the second bent portion is caught by the holder main body. It becomes difficult. For this reason, the holder body can be easily assembled to the holder stay.

  According to a sixth aspect of the present invention, in the motor brush holding device according to any one of the second to fourth aspects, the second bent portion has a notch formed in the first bent portion as the holder. The gist is that it is formed by bending toward the side wall of the main body.

According to this configuration, the second bent portion can be formed simply by forming a notch in the first bent portion and bending the first notched portion, so that the formation becomes easy.
The gist of a seventh aspect of the present invention is that, in the brush holding device for a motor according to any one of the second to sixth aspects, the first bent portion is provided with a rib.

According to this configuration, the strength of the first bent portion can be increased, which is effective in holding the second bent portion more firmly.
And, according to the invention of claim 8, the present invention provides a vehicle steering apparatus in which a motor is used as a drive source, as a device for holding a brush of the motor, according to any one of claims 1 to 7. It is particularly effective to use a brush holding device for a motor, whereby it is possible to accurately suppress the occurrence of abnormal noise of the vehicle steering apparatus as well as the occurrence of abnormal noise of the motor. For this reason, it becomes possible to provide a vehicle steering apparatus that is excellent in quietness.

  According to the brush holding device of the motor and the vehicle steering device using the brush holding device of the motor according to the present invention, it is possible to suppress the generation of abnormal noise due to the vibration of the brush.

The schematic block diagram of the steering apparatus for vehicles. Sectional drawing which shows the cross-sectional structure about the motor of the steering apparatus for vehicles. The perspective view which shows the perspective structure about one Embodiment of the brush holding device of the motor concerning this invention. The perspective view which shows the disassembled perspective structure about the brush holding device of the motor of the embodiment. Sectional drawing which shows the cross-section about the brush holding device of the motor of the embodiment. The front view which shows the front structure of the holder stay about the brush holding device of the motor of the embodiment. The perspective view which shows the enlarged structure of the extension part periphery of the holder stay about the other example of the brush holding device of the motor concerning this invention. (A), (b) is the perspective view and front view which respectively show the perspective structure and front structure of the holder stay about the other example of the brush holding device of the motor concerning this invention. The perspective view which shows the perspective structure of the holder stay about the other example of the brush holding device of the motor concerning this invention. The perspective view which shows the disassembled perspective structure about the brush holding device of the conventional motor. The top view which shows the planar structure of the holder stay about the brush holding device of the conventional motor.

  Hereinafter, an embodiment in which a brush holding device of a motor according to the present invention is applied to a motor of a vehicle steering device will be described with reference to FIGS. First, an outline of a vehicle steering apparatus will be described with reference to FIG.

  As shown in FIG. 1, in this vehicle steering apparatus, a steering shaft 2 fixed to a steering 1 is connected to a rack shaft 4 via a rack and pinion mechanism 3. The rotation of the steering shaft 2 accompanying the operation of the steering 1 is converted into a reciprocating linear motion of the rack shaft 4 by the rack and pinion mechanism 3. The steering shaft 2 is formed by connecting a column shaft 2a, an intermediate shaft 2b, and a pinion shaft 2c. The reciprocating linear motion of the rack shaft 4 accompanying the rotation of the steering shaft 2 is transmitted to a knuckle (not shown) via tie rods 5 connected to both ends of the rack shaft 4, whereby the steering angle of the steered wheels 6, That is, the traveling direction of the vehicle is changed.

  In this vehicle steering device, an assist force for assisting the operation of the steering 1 is applied from the actuator 10 to the steering system. The actuator 10 is configured as a so-called column type actuator in which a motor 11 as a driving source is drivingly connected to a column shaft 2 a via a speed reduction mechanism 12. The motor 11 is a DC motor with a brush. The actuator 10 decelerates the rotation of the motor 11 and transmits it to the column shaft 2a, thereby applying the motor torque as an assist force to the steering system.

Next, the configuration of the motor 11 will be described with reference to FIG.
As shown in FIG. 2, the motor 11 includes a stator 22 in which a permanent magnet 21 is fixed to the inner periphery of a yoke 20 having a substantially bottomed cylindrical shape, and an armature that is rotatably supported inside the permanent magnet 21. 23 and a brush motor provided with a brush 24 for supplying power to the armature 23.

  More specifically, the armature 23 includes a core 26 and a commutator 27 that are fixed to the rotating shaft 25 and rotate integrally with the rotating shaft 25. The rotating shaft 25 is disposed along the axis of the yoke 20 by being supported by bearings 29a and 29b provided on the housing 28 that closes the bottom 20a of the yoke 20 and the opening end 20b of the yoke 20, respectively. Yes. As a result, the armature 23 is rotatably accommodated in the yoke 20 with the core 26 disposed at the axial position corresponding to the permanent magnet 21.

  More specifically, the core 26 has a plurality of teeth 30 provided radially extending outward in the radial direction, and windings (motor coils) 31 are wound around the teeth 30. ing. A plurality of magnetic poles are formed along the circumferential direction of the permanent magnet 21 facing the core 26 on the stator 22 side.

  On the other hand, the commutator 27 is formed by fixing a plurality of segments 33 on the peripheral surface of the cylindrical body 32 fixed to the rotating shaft 25. Specifically, the cylindrical body 32 is disposed in the yoke 20 on the opening end 20 b side (lower side in FIG. 2) from the core 26, and each segment 33 is arranged on the circumferential surface of the cylindrical body 32. Are arranged at predetermined intervals along the line. Each segment 33 is connected to a part of the winding 31 wound around each tooth 30.

  Further, the motor 11 has a plurality of brushes 24 arranged along the circumferential direction so as to surround the commutator 27 on the radially outer side of the commutator 27. Each brush 24 is housed in a plurality of brush holders 40 fixed to the substrate 50, so that its position is maintained. Thus, in this embodiment, the brush holding device 13 that holds the brush 24 is configured by the substrate 50 and the brush holder 40. Further, each brush 24 is energized by a coil spring 34 as an energizing means housed in the brush holder 40, thereby causing each segment 33 disposed on the peripheral surface of the commutator 27 to The tip is in sliding contact.

  More specifically, positive and negative voltages corresponding to the motor rotation are applied to each brush 24 through a pigtail 24a, with a pair of two spaced apart in the circumferential direction at a predetermined angle. Each brush 24 is in sliding contact with each segment 33 corresponding to the rotational position of the commutator 27, thereby energizing the windings 31 connected to each segment 33. In other words, in the motor 11, the segment 33 that is in sliding contact with each brush 24 is moved by the rotation of the armature 23, thereby switching (rectifying) the energization direction with respect to the winding 31 constituting the motor coil. The motor 11 generates motor torque based on electromagnetic force (electromagnetic attractive force and repulsive force) generated between the winding 31 and each magnetic pole formed on the stator 22 side by energizing the winding 31. It has a configuration that occurs.

Next, the structure of the brush holding device 13 will be described in detail with reference to FIGS.
As shown in FIG. 3, the brush holder 40 constituting the brush holding device 13 is formed as a rectangular cylindrical body whose front portion is opened and whose rear portion is closed. As shown in FIG. 4, the brush holder 40 includes a holder main body 60 having a U-shaped cross section perpendicular to the urging direction of the brush (the direction indicated by the arrow a in the figure), the bottom of the holder main body 60, and It is configured as a two-part split body such as an L-shaped holder stay 70 that closes the opening of the back. Thereby, the freedom degree and convenience at the time of manufacture and assembly | attachment of the brush holder 40 are improved.

  An insertion hole 69a serving as a portion through which the pigtail is inserted is formed in an upper wall 69 provided so as to connect both side walls 61 and 62 in the holder body 60. Engaging portions 67 and 68 extending downward are formed at the lower end portion of the holder body 60, and L-shaped leg portions 63 to 66 are formed so as to sandwich the engaging portions 67 and 68, respectively. Has been. Then, as shown in FIG. 5, after the engaging portions 67 and 68 are respectively inserted into the through holes 51 and 52 formed in the substrate 50, the distal end portions thereof are bent inward, whereby the holder main body 60. Is fixed to the substrate 50.

  On the other hand, as shown in FIG. 4, in the holder stay 70, each of the leg portions 63 to 66 of the holder main body 60 is provided on the right side surface and the left side surface of the base portion 71 that is a portion that closes the opening portion of the bottom portion of the holder main body 60. Corresponding to the positions, extending portions 73 to 76 extending outward from both side walls 61 and 62 of the holder main body 60 are formed. As shown in FIG. 5, when the holder main body 60 is fixed to the substrate 50, the extension portions 73 to 76 are sandwiched between the leg portions 63 to 66 and the substrate 50, so that the holder stay 70 is attached to the substrate. 50 is held in contact with 50. At this time, the base portion 71 is disposed inside the opposite side walls 61 and 62 of the holder main body 60, and the base portion 71 closes the opening at the bottom of the holder main body 60.

  Further, first bent portions 73a to 76a and second bent portions 73b to 76b are formed at the distal ends of the extending portions 73 to 76, respectively. The first bent portions 73a to 76a are formed by being bent in parallel to both side walls 61 and 62 of the holder main body 60 so as to face each other. The second bent portions 73b to 76b are formed by bending portions extending from the first bent portions 73a to 76a toward the upper wall 69 of the holder body 60 toward both side walls 61 and 62 of the holder body 60. Has been. As shown in FIG. 6, the front structure of the holder stay 70 before the holder main body 60 is assembled, the second bent portions 73 b to 76 b have their distal end portions on the outer surfaces of the side walls 61 and 62 of the holder main body 60. It is bent so as to be located inside. That is, the width w20 between the pair of second bent portions 73b and 75b and the pair of second bent portions 74b and 76b is narrower than the width w21 between the outer surfaces of the side walls 61 and 62 of the holder body 60. It has become. As shown in FIG. 4, in the present embodiment, each width (more specifically, the width in the direction indicated by the arrow a perpendicular to the bending direction) w <b> 10 of the first bent portions 73 a to 76 a is set to the second width. By making the widths of the bent portions 73b to 76b wider than the widths w11, the rigidity of the first bent portions 73a to 76a is enhanced.

Next, the effect | action of the brush holding | maintenance apparatus 13 concerning this embodiment is demonstrated with reference to previous FIGS.
As shown in FIG. 4, in the brush holding device 13 of the present embodiment, the holder main body 60 is assembled from above the holder stay 70, so the direction in which the holder main body 60 is assembled to the holder stay 70 and the second bent portion 73 b. The bending direction of ˜76b matches. Therefore, when the holder main body 60 is assembled to the holder stay 70, the second bent portions 73b to 76b are not easily caught on the holder main body 60, so that the holder main body 60 can be easily assembled to the holder stay 70.

  When the holder stay 70 is assembled to the holder main body 60, the second bent portions 73b to 76b are moved from the positions illustrated in FIG. 6 (the positions indicated by broken lines in FIG. 5) by the side walls 61 and 62 of the holder main body 60. It is bent to the position of the solid line in FIG. Thus, the outer surfaces of the side walls 61 and 62 of the holder body 60 are sandwiched and pressed from both sides by the pair of second bent portions 73b and 75b and the pair of second bent portions 74b and 76b. That is, the second bent portions 73b to 76b function as leaf spring type pressing portions with respect to the side walls 61 and 62 of the holder body 60. Therefore, since both side walls 61 and 62 of the holder body 60 are held in contact with the side surfaces of the base portion 71 of the holder stay 70, the holder body is not affected by dimensional tolerances other than the holder body 60 and the base portion 71 of the holder stay 70. The width of the inner surfaces of both side walls 61 and 62 of 60 is restricted to the width w22 of the base portion 71. Thereby, since the dimensional accuracy of the clearance gap between the brush holder 40 and the brush accommodated in it can be raised, generation | occurrence | production of the noise accompanying brush vibration can be suppressed.

  As shown in FIG. 4, in this embodiment, the rigidity of the first bent portions 73 a to 76 a is set by making the width w10 of the first bent portions 73 a to 76 a wider than the width w11 of the second bent portions 73 b to 76 b. Therefore, the second bent portions 73b to 76b can be firmly held. Further, since the first bent portions 73a to 76a are formed substantially parallel to the side walls 61 and 62 of the holder main body 60, the second bent portions 73b to 76b are bent when the holder main body 60 and the holder stay 70 are assembled. Sometimes, the second bent portions 73b to 76b can be firmly held. And if the 2nd bending parts 73b-76b are hold | maintained firmly in this way, since pressing force can be correctly given to the both side walls 61 and 62 of the holder main body 60 from the 2nd bending parts 73b-76b, it is a brush. The dimensional accuracy of the gap between the holder 40 and the brush is further improved. Therefore, the generation of abnormal noise can be suppressed more accurately.

As described above, according to the motor brush holding device and the vehicle steering device according to the present embodiment, the following effects can be obtained.
(1) The holder stay 70 is bent so as to extend from the base portion 71 to the outside of the side walls 61 and 62 of the holder body 60 and to sandwich and press the outer surfaces of the side walls 61 and 62 from both sides. A pair of extending portions 73 to 76 are provided. Thereby, since the dimensional accuracy of the clearance gap between the brush holder 40 and a brush is raised, generation | occurrence | production of the noise accompanying brush vibration can be suppressed now.

  (2) The extending portions 73 to 76 include first bent portions 73 a to 76 a formed by bending so as to face both side walls 61 and 62 of the holder body 60, and the first bent portions 73 a to 76 a. The extended portions are provided with second bent portions 73 b to 76 b formed by bending the holder main body 60 toward both side walls 61 and 62. Thereby, the force which presses the both side walls 61 and 62 of the holder main body 60 can be easily adjusted only by changing suitably the bending angle, thickness, etc. of the 2nd bending parts 73b-76b. Therefore, since the dimensional accuracy of the gap between the brush and the brush holder 40 can be further increased, it is possible to more appropriately suppress the generation of abnormal noise.

  (3) The width w10 in the direction orthogonal to the bending direction of the first bent portions 73a to 76a is made wider than the width w11 in the direction orthogonal to the bending direction of the second bent portions 73b to 76b. Further, the first bent portions 73 a to 76 a are bent in parallel to the side walls 61 and 62 of the holder body 60. Thereby, since the 2nd bending parts 73b-76b can be hold | maintained firmly, a pressing force can be reliably provided to the both side walls 61 and 62 of the holder main body 60 from the 2nd bending parts 73b-76b. Therefore, the generation of abnormal noise can be more accurately suppressed.

  (4) Bending portions of the second bent portions 73b to 76b extending from the first bent portions 73a to 76a toward the upper wall 69 of the holder body 60 toward both side walls 61 and 62 of the holder body 60 It was decided to form. Thereby, when the holder main body 60 is assembled to the holder stay 70, the second bent portions 73b to 76b are not easily caught on the holder main body 60, so that the holder main body 60 can be easily assembled to the holder stay 70.

  (5) The brush holding device 13 of the motor according to the present invention is applied to the motor of the vehicle steering device. Thereby, not only the generation of abnormal noise of the motor but also the generation of abnormal noise of the vehicle steering apparatus can be suppressed accurately. For this reason, it becomes possible to provide a vehicle steering apparatus that is excellent in quietness.

In addition, the said embodiment can also be implemented with the following forms which changed this suitably.
-As shown in FIG. 7, you may provide reinforcement structures, such as the rib 77, in the 1st bending parts 73a-76a. Thereby, since the rigidity of the 1st bending parts 73a-76a can be improved, the 2nd bending parts 73b-76b can be hold | maintained still more firmly.

  In the above embodiment, the holder stay 70 is provided with the two pairs of extending portions 73 to 76, but the pair of them can be omitted. Further, the holder stay 70 may be provided with three or more pairs of extending portions.

  In the above embodiment, the first bent portions 73 a to 76 a are bent so as to be parallel to the side walls 61 and 62 of the holder body 60. Instead of this, for example, bending may be performed in a direction closer to or away from the side walls 61 and 62 of the holder body 60 than in parallel. In order to firmly hold the second bent portions 73b to 76b, the first bent portions 73a to 76a are parallel to the side walls 61 and 62 of the holder main body 60 or to the side walls 61 and 62 of the holder main body 60 rather than parallel. It is desirable to bend in the adjacent direction. Moreover, about 1st bending part 73a-76a, not only a bending angle but those plate thickness, a shape, etc. may be changed suitably, for example.

  -Also about 2nd bending part 73b-76b, you may change those plate | board thickness, shape, bending angle, etc. suitably. Specifically, for example, as shown in FIG. 8A, the second bent portion is formed by bending notches formed in the first bent portions 73 a to 76 a toward both side walls 61 and 62 of the holder body 60. The portions 73c to 76c may be formed. As shown in FIG. 8B, the second bent portions 73 c to 76 c are bent so that the tip side portions are located inside the outer surfaces of the side walls 61 and 62 of the holder body 60. . With such a structure, when the holder stay 70 is assembled to the holder main body 60, the second bent portions 73c to 76c are bent to the positions indicated by broken lines in the drawing, and both side walls of the holder main body 60 are formed by the second bent portions 73c to 76c. The outer surfaces of 61 and 62 are sandwiched and pressed from both sides. For this reason, the effect according to the effect by the said 1st Embodiment can be acquired. Moreover, since the 2nd bending parts 73c-76c can be formed only by forming a notch in the 1st bending parts 73a-76a and bending this, formation of a 2nd bending part becomes easy.

  As shown in FIG. 9, the end portions of the extending portions 73 to 76 are bent toward the side walls 61 and 62 of the holder main body 60, and the side walls 61 and 62 of the holder main body 60 are bent by the extending portions 73 to 76. The outer surface may be sandwiched and pressed from both sides. According to such a configuration, since it is not necessary to provide the first bent portion and the second bent portion in the extending portions 73 to 76, it is possible to simplify the structure of the extending portion, and thus manufacture the holder stay 70. Becomes easy.

In the above embodiment, the width w10 of the first bent portions 73a to 76a is made wider than the width w11 of the second bent portions 73b to 76b, but these widths may be the same.
In the above embodiment, the bottom and back opening portions of the holder body 60 are closed by the L-shaped holder stay 70. Instead of this, for example, the holder stay may be formed in a flat plate shape, and only the opening at the bottom of the holder body 60 may be closed by the holder stay. In this case, one end of the coil spring 34 shown in FIG. 2 may be brought into contact with the inner wall of the housing 28. In the present embodiment, the brush holding device of the motor according to the present invention is applied to the motor of the vehicle steering device. However, the motor brush holding device may be applied to a motor used for purposes other than the vehicle steering device. .

  DESCRIPTION OF SYMBOLS 1 ... Steering, 2 ... Steering shaft, 2a ... Column shaft, 2b ... Intermediate shaft, 2c ... Pinion shaft, 3 ... Rack and pinion mechanism, 4 ... Rack shaft, 5 ... Tie rod, 6 ... Steering wheel, 10 ... Actuator, DESCRIPTION OF SYMBOLS 11 ... Motor, 12 ... Deceleration mechanism, 13 ... Brush holding device, 20 ... Yoke, 20a ... Bottom part, 20b ... Open end, 21 ... Permanent magnet, 22 ... Stator, 23 ... Armature, 24 ... Brush, 24a ... Pigtail, 25 ... Rotating shaft, 26 ... Core, 27 ... Commutator, 28 ... Housing, 29a ... Bearing, 29b ... Bearing, 30 ... Teeth, 31 ... Winding, 32 ... Cylindrical body, 33 ... Segment, 34 ... Coil spring, 40 , 100 ... brush holder, 50, 101 ... substrate, 51, 52, 102, 103 ... through hole, 60, 80 ... e DA main body 61, 62 ... Side wall, 63-66 ... Leg part, 67, 68 ... Engagement part, 69 ... Upper wall, 69a ... Insertion hole, 70, 90 ... Holder stay, 71 ... Base part, 73-76 ... Extension Installation part, 73a-76a ... 1st bending part, 73b-76b, 73c-76c ... 2nd bending part, 77 ... Rib, 81-84 ... Projection part, 85, 86 ... Engagement part, 91-94 ... Recessed part.

Claims (8)

A brush holder made of a rectangular cylinder that accommodates a brush of a motor and a biasing means that biases the brush, a holder main body having a U-shaped cross-section in a direction perpendicular to the biasing direction of the brush, In the brush holding device of the motor, which is formed by a holder stay disposed inside the opposite side walls of the holder body and closing the opening of the holder body, and the brush is held by the brush holder.
The holder stay is bent so as to extend from the base portion disposed inside the both side walls of the holder main body to the outside of the both side walls of the holder main body and to sandwich and press the outer surfaces of the both side walls from both sides. A brush holding device for a motor, comprising: a pair of pressing portions. The pressing portion includes a first bent portion formed by bending a portion extending outward from the side wall of the holder body from the base portion so as to face the side wall of the holder body, and the first bent portion. 2. The motor according to claim 1, further comprising a second bent portion that is formed by bending a portion extending from the holder body toward the side wall of the holder body and serves as a portion that applies a pressing force to the side wall. Brush holding device. The brush holding device for a motor according to claim 2, wherein a width of the first bent portion is set wider than a width of the second bent portion. 4. The motor brush holding device according to claim 2, wherein the first bending portion is formed by bending in a direction parallel to the side wall of the holder body or in a direction closer to the side wall of the holder body than parallel. 5. . When a portion provided to connect the both side walls in the holder body is an upper wall, the second bent portion has a portion extending from the first bent portion toward the upper wall of the holder main body. The motor brush holding device according to any one of claims 2 to 4, wherein the brush holding device is formed by bending toward a side wall of the main body. 5. The motor according to claim 2, wherein the second bent portion is formed by bending a notch formed in the first bent portion toward a side wall of the holder main body. Brush holding device. The motor brush holding device according to any one of claims 2 to 6, wherein the first bent portion is provided with a rib. In a vehicle steering apparatus in which a motor is used as a drive source,
The motor brush holding device according to claim 1, wherein the motor brush holding device is used as a device for holding the brush of the motor.

Images