WO2019244873A1

WO2019244873A1 - Motor

Info

Publication number: WO2019244873A1
Application number: PCT/JP2019/024044
Authority: WO
Inventors: 康介山浦; 祥祈松下; 和人木藤
Original assignee: 株式会社デンソー
Priority date: 2018-06-20
Filing date: 2019-06-18
Publication date: 2019-12-26

Abstract

This motor comprises a yoke housing (12), a brush holder (21), a housing case (41) and a circuit board (72). The brush holder holds a power supply brush (22) and power supply terminals (23, 24). The housing case has a board containing recess (46) into which front end portions of the power supply terminals are inserted. The circuit board has terminals (73, 74) which are electrically connected to the power supply terminals within the board containing recess. The power supply terminals have terminal connection parts (23a, 24a) which linearly extend and are arranged in the board containing recess. The terminals are fork terminals which are electrically connected to the terminal connection parts. With respect to the terminal connection parts, portions closer to the base ends than terminal connected positions (23b, 24b), where the terminals are connected, are covered by noise reduction member (81, 82) for reducing noise.

Description

motor

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2018-117191 filed on June 20, 2018 and Japanese Application No. 2018-218277 filed on November 21, 2018, and the contents thereof are described herein. Invite.

The present disclosure relates to a motor.

Conventional motors generate noise when the power supply brush slides against the commutator. As a countermeasure against noise in such a motor, there is a technique in which a ferrite core as a noise reduction member that covers the external cable for power supply connected to the motor is provided (for example, see Patent Document 1).

JP 2007-5751 A

However, in the above-described configuration, there is a problem that a ferrite core and a ferrite core holder for fixing the ferrite core are provided outside the motor, and a mounting space of the device including the ferrite core is increased.

An object of the present disclosure is to provide a motor capable of reducing a mounting space.
To achieve the above object, a motor according to one embodiment of the present disclosure includes a yoke housing (12), a brush holder (21), a housing case (41), and a circuit board (72). The yoke housing has a bottomed cylindrical shape in which a rotor (11) is accommodated inside. The brush holder holds a power supply brush (22) for supplying power to the rotor and power supply terminals (23, 24) electrically connected to the power supply brush, and is fitted into an opening of the yoke housing. The housing case has a substrate housing recess (46) into which the tip of the power supply terminal is inserted, and houses a speed reduction mechanism (31) for reducing the rotation of the rotor, and is connected to the opening of the yoke housing. You. The circuit board has terminals (73, 74) that are electrically connected to the power supply terminals inside the board housing recess, and is housed in the board housing recess. The power supply terminal has terminal connection portions (23a, 24a) that extend linearly and are arranged in the substrate receiving recess. The terminal is a forked terminal that is electrically connected to the terminal connecting portion from a direction that intersects a direction in which the terminal connecting portion extends. A portion of the terminal connection portion closer to the base end than the terminal connection position (23b, 24b) to which the terminal is connected is covered with a noise reduction member (81, 82) for reducing noise.

According to the configuration, the terminal connection portion is covered with the noise reduction member on the base end side of the terminal connection position where the terminal of the circuit board is connected. Therefore, the overall mounting space can be reduced in size as compared with the case where the noise reduction member is provided outside the motor. Further, it is possible to suppress the noise generated on the power supply brush side from propagating to the circuit board.

The above object and other objects, features, and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. The drawing is
FIG. 1 is a front view of a motor according to an embodiment. FIG. 2 is an exemplary front view of the motor according to the embodiment in a partially disassembled state; FIG. 3 is an enlarged view of a housing case in the motor according to the embodiment. FIG. 4 is an enlarged view of a housing case and a power supply terminal in the motor according to the embodiment. FIG. 5 is a side view of the motor according to the embodiment in a partially disassembled state. FIG. 6 is a partial cross-sectional view of a power supply terminal and a noise reduction member according to one embodiment. FIG. 7 is an enlarged view of a housing case in another example of the motor. FIG. 8 is an enlarged view of a housing case and a power supply terminal in another example of the motor. FIG. 9 is an enlarged view of a housing case and a power supply terminal in another example of the motor. FIG. 10 is a partial cross-sectional view for explaining another example of a power supply terminal and a circuit component. FIG. 11 is a partial cross-sectional view illustrating another example of a power supply terminal and a circuit component. FIG. 12 is a side view of another example of a circuit component. FIG. 13 is a partial cross-sectional view illustrating another example of a power supply terminal and a circuit component.

Hereinafter, an embodiment of the motor will be described.
As shown in FIG. 1, the motor 10 has a bottomed cylindrical yoke housing 12 (hereinafter, referred to as a yoke 12) in which a rotor 11 is housed. The yoke 12 has a flange portion 12 a extending radially outward from an opening of the yoke 12. The magnet 13 is fixed to the inner peripheral surface of the yoke 12, and the rotor 11 is rotatably arranged inside the magnet 13.

The rotor 11 has a rotation shaft 14 arranged at the center of the yoke 12. The base end of the rotating shaft 14 is supported by a bearing 15 provided at the center of the bottom of the yoke 12. An armature core 16 radially opposed to the magnet 13 is fixed to the rotating shaft 14 so as to be integrally rotatable, and an armature coil 17 is wound around the armature core 16. A commutator 18 to which an armature coil 17 is electrically connected is fixed to a portion of the rotating shaft 14 closer to the distal end side than the armature core 16 so as to be integrally rotatable with the rotating shaft 14. The tip of the rotating shaft 14 protrudes from the opening of the yoke 12 to the outside of the yoke 12 (toward a housing case 41 described later).

ブラシ As shown in FIGS. 1 and 2, a brush holder 21 is fitted into the opening of the yoke 12. The brush holder 21 of the present embodiment is formed of an insulating resin material. The rotating shaft 14 has a portion closer to the tip side than the commutator 18 penetrates the brush holder 21 and is supported by a bearing (not shown) held by the brush holder 21. The brush holder 21 holds a plurality of power supply brushes 22 that are in sliding contact with the commutator 18.

(4) The brush holder 21 holds a pair of

power supply terminals

23 and 24. In the present embodiment, the

power supply terminals

23 and 24 are insert-molded in a resin brush holder 21. Each of the

power supply terminals

23 and 24 is formed by pressing a conductive metal plate material, and is embedded in the brush holder 21 so as to be partially exposed to the outside of the brush holder 21. The tip of each of the

power supply terminals

23 and 24 is exposed to the outside of the brush holder 21 at a position radially displaced from the rotary shaft 14 (a position shifted downward from the rotational axis L1 of the rotary shaft 14 in FIG. 2). ing. A portion exposed to the outside of the brush holder 21 on the tip end side of each of the

power supply terminals

23 and 24 is linearly formed on a side opposite to the yoke 12 in parallel with a rotation axis L1 of the rotation shaft 14 (hereinafter, referred to as a rotation axis L1). Extends. In each of the

power supply terminals

23 and 24, this portion extending parallel to the rotation axis L1 is a

terminal connection portion

23a or 24a. A power supply brush 22 is electrically connected to a portion of each of the

power supply terminals

23 and 24 closer to the base end than the

terminal connection portions

23a and 24a and exposed from the brush holder 21.

The motor 10 includes a resin housing case 41 that houses the speed reduction mechanism 31 that reduces the rotation of the rotor 11 and is connected to the yoke 12. The housing case 41 includes a fixing portion 42 for fixing the housing case 41 and the yoke 12 at a position (an end on the right side in FIG. 2) facing the yoke 12 in the direction of the rotation axis L1. The fixing portion 42 has a shape overlapping the flange portion 12a of the yoke 12 and the brush holder 21 in the direction of the rotation axis L1. The fixing portion 42 is provided with a concave portion (not shown) for accommodating a portion of the brush holder 21 projecting from the yoke 12. The housing case 41 is connected to the yoke 12 by fixing the flange portion 12 a of the yoke 12 to the fixing portion 42 with the screw 43 while the brush holder 21 is held between the fixing portion 42 and the yoke 12. ing.

The housing case 41 has a worm housing portion 44 extending from the fixed portion 42 to the side opposite to the yoke 12 in the direction of the rotation axis L1. The worm housing portion 44 houses the worm 32 in the form of a screw tooth that rotates integrally with the rotating shaft 14. Further, the housing case 41 has a worm wheel housing 45 provided integrally with the worm housing 44 on the side (upper side in FIG. 2) of the worm housing 44. A worm wheel 33 having a substantially disk shape is rotatably housed in the worm wheel housing 45. In the present embodiment, the speed reduction mechanism 31 is a worm speed reduction mechanism including the worm wheel 33 and the worm 32. An output shaft 34 extending in the axial direction of the worm wheel 33 is provided at a radially central portion of the worm wheel 33 so as to be integrally rotatable with the worm wheel 33. The output is output from the output shaft 34.

The housing case 41 has a substrate accommodating concave portion 46 at a position adjacent to the fixing portion 42 in the direction of the rotation axis L1. The substrate accommodating concave portion 46 is a concave portion provided in a direction perpendicular to the rotation axis L1 and parallel to the rotation axis of the output shaft 34 (perpendicular direction in FIG. 2). The substrate accommodating concave portion 46 of the present embodiment has a rectangular shape that is long in the direction of the rotational axis L1 when viewed from the opening 46a of the substrate accommodating concave portion 46 in a direction orthogonal to the rotation axis L1. ing.

The substrate housing recess 46 has a terminal insertion portion 48 provided by partitioning a portion adjacent to the fixing portion 42 in the substrate housing recess 46 by a partition wall 47. The partition wall 47 is provided in the substrate accommodating concave portion 46 at a position separated from the fixed portion 42 in the direction of the rotation axis L1 and protrudes from the bottom surface 46b of the substrate accommodating concave portion 46 toward the opening 46a of the substrate accommodating concave portion 46. ing. When viewed from the opening 46a of the substrate housing recess 46 (see FIG. 2), the partition wall 47 extends from the worm housing 44 to the side wall 46c of the substrate housing recess 46 along a direction orthogonal to the direction of the rotation axis L1. ing. The side wall portion 46c is a peripheral wall that stands upright along the outer periphery of the substrate housing concave portion 46.

As shown in FIGS. 2 and 3, the housing case 41 has a pair of

terminal insertion ports

51, 52 that penetrate the fixing part 42 in the direction of the rotation axis L <b> 1 and open inside the terminal insertion part 48. The

terminal insertion ports

51 and 52 communicate the terminal insertion portion 48 with the concave portion (not shown) for accommodating the brush holder 21 provided in the fixing portion 42. The

terminal insertion openings

51 and 52 are separated from each other in the direction perpendicular to the direction of the rotation axis L1 at the same interval as the interval between the terminal connecting

portions

23a and 24a when viewed from the recessed direction of the substrate accommodating recess 46 (that is, the state shown in FIG. 2). are doing.

As shown in FIG. 4, the

power supply terminals

23 and 24 are inserted into terminal insertion ports 48 from terminal ends of the

power supply terminals

23 and 24, and are inserted into the terminal insertion portions 48. , 24a are arranged inside the terminal insertion portion 48 (inside the substrate accommodating recess 46). The

terminal connection portions

23a and 24a arranged in the terminal insertion portion 48 extend in parallel with the rotation axis L1 and are parallel to each other. The

terminal connecting portions

23a and 24a are separated from each other in a direction perpendicular to the direction of the rotation axis L1 when viewed from the direction in which the substrate accommodating recess 46 is provided. Further, the ends of the

terminal connection portions

23 a and 24 a (the ends of the power supply terminals 23 and 24) reach the partition wall 47.

制御 As shown in FIGS. 1 and 5, a control device 71 for controlling driving of the motor 10 is housed in the substrate housing recess 46. The control device 71 has a circuit board 72 on which a plurality of electronic components are mounted. The circuit board 72 has a rectangular flat plate shape that is slightly smaller than the opening 46 a of the board housing recess 46. The circuit board 72 is housed in the board housing recess 46 so as to substantially close the opening 46a of the board housing recess 46. The circuit board 72 is parallel to the direction of the rotation axis L1 (so that the direction perpendicular to the direction of the rotation axis L1 is the thickness direction of the circuit board 72), and the rotation axis of the output shaft 34 and the circuit board 72. Is accommodated in the substrate accommodating recess 46 so that the thickness direction of the substrate is parallel to the thickness direction. The circuit board 72 is accommodated in the board accommodating recess 46 such that the direction in which the board accommodating recess 46 is provided coincides with the thickness direction of the circuit board 72.

2 and 5, the circuit board 72 includes a pair of

terminals

73 and 74 that are electrically connected to the

power supply terminals

23 and 24. The

terminals

73 and 74 are erected on a portion of the circuit board 72 that overlaps with the terminal insertion portion 48. Each of the

terminals

73 and 74 is a bifurcated terminal erected at a right angle with respect to the circuit board 72, and has a pair of clamping pieces 75 branched in a bifurcated shape at the distal end. The

terminals

73 and 74 are provided so as to be separated from each other in the direction (vertical direction in FIG. 5) orthogonal to the direction of the rotation axis L1 by the same distance as the distance between the

terminal connection portions

23a and 24a. I have.

As shown in FIGS. 4 and 5, these

terminals

73 and 74 are electrically connected to the

terminal connection portions

23a and 24a from a direction intersecting the direction in which the

terminal connection portions

23a and 24a extend. More specifically, the one terminal 73 is connected to the terminal connecting portion 23a from a direction perpendicular to the direction of the rotation axis L1 so that the terminal connecting portion 23a of the one power supply terminal 23 is inserted between the pair of holding pieces 75. The terminal connection portion 23a is disposed between the pair of holding pieces 75. As a result, the terminal 73 is connected to the terminal connection portion 23a in a direction orthogonal to the direction of the rotation axis L1 and in a direction in which the circuit board 72 is attached to the housing case 41. Similarly, the other terminal 74 is arranged from the direction orthogonal to the rotation axis L1 direction with respect to the terminal connection portion 24a so that the terminal connection portion 24a of the other power supply terminal 24 is inserted between the pair of holding pieces 75. The terminal connecting portion 24a is held between the pair of holding pieces 75. Thus, the terminal 74 is connected to the terminal connection portion 24a in a direction orthogonal to the direction of the rotation axis L1 and in a direction in which the circuit board 72 is attached to the housing case 41. The position where the terminal 73 is connected in the terminal connection part 23a is the terminal connection position 23b, and the position where the terminal 74 is connected in the terminal connection part 24a is the terminal connection position 24b. In the present embodiment, the terminal connection position 23b in the terminal connection portion 23a and the terminal connection position 24b in the terminal connection portion 24a are on a straight line orthogonal to the direction of the rotation axis L1 when viewed from the recessed direction of the substrate housing concave portion 46 ( 4 (located on a straight line L2 shown by a dashed line).

As shown in FIGS. 1 and 5, the circuit board 72 is provided with a connector portion (not shown) to which an external connector (not shown) electrically connected to an external power supply device is connected. . This connector portion is exposed to the outside of the housing case 41 from a cutout portion 53 provided in a side wall portion 46c of the board accommodating concave portion 46. The connector section is electrically connected to the

terminals

73 and 74 on the circuit board 72.

As shown in FIGS. 3 and 4, the terminal insertion portion 48 has a direction in which the

terminal connecting portions

23 a and 24 a protrude from the bottom surface 46 b of the board housing recess 46 toward the opening 46 a of the board housing recess 46 and extend (this embodiment). In this case, projecting

walls

54a, 54b, and 54c are provided in a direction orthogonal to the rotation axis L1). The protruding

walls

54a, 54b, 54c are located closer to the base end of the power supply terminals 23, 24 (the right side in FIG. 4) than the distal ends of the terminal connection positions 23b, 24b. And inside the terminal insertion part 48, the protruding wall 54a is located between the worm housing part 44 and the terminal connecting part 23a, and the protruding wall 54b is located between the terminal connecting part 23a and the terminal connecting part 24a. The projecting wall 54c is located between the terminal connecting portion 24a and the side wall portion 46c.

分離 Further, the partition wall 47 is provided with

separation grooves

47a and 47b recessed from the distal end to the base end of the partition wall 47 at two locations separated in a direction orthogonal to the direction of the rotation axis L1. By providing the

separation grooves

47a and 47b, the partition wall 47 is divided into three portions, namely, the divided

walls

55a, 55b and 55c. The tip of one power supply terminal 23 is arranged in one separation groove 47a, and the tip of the other power supply terminal 24 is arranged in the other separation groove 47b. Therefore, the divided

walls

55a, 55b, and 55c are aligned with the

terminal connection portions

23a and 24a in a direction (vertical direction in FIG. 4) orthogonal to the direction in which the

terminal connection portions

23a and 24a extend.

Inside the substrate accommodating recess 46, the dividing wall 55a is located between the worm accommodating portion 44 and the terminal connecting portion 23a, and the dividing wall 55b is located between the terminal connecting portion 23a and the terminal connecting portion 24a, The division wall 55c is located between the terminal connection part 24a and the side wall part 46c. Accordingly, when viewed from the opening 46a of the substrate accommodating recess 46 (as viewed from the direction in which the substrate accommodating recess 46 is provided), the protruding

walls

54a, 54b are orthogonal to the terminal connecting portion 23a and the direction in which the terminal connecting portion 23a extends. It is provided on both sides of the direction. The dividing

walls

55a and 55b are provided on both sides of the terminal connecting portion 23a in a direction orthogonal to the direction in which the terminal connecting portion 23a extends. The protruding

walls

54a, 54b and the dividing

walls

55a, 55b are located on both sides in the direction in which the terminal connection portion 23a extends with respect to the terminal connection position 23b of the terminal connection portion 23a. Also, when viewed from the opening 46a of the substrate accommodating recess 46, the protruding

walls

54b and 54c are provided on both sides of the terminal connecting portion 24a in a direction orthogonal to the direction in which the terminal connecting portion 24a extends. The dividing

walls

55b and 55c are provided on both sides of the terminal connecting portion 24a in a direction orthogonal to the direction in which the terminal connecting portion 24a extends. The protruding

walls

54b and 54c and the dividing

walls

55b and 55c are located on both sides in the direction in which the terminal connection portion 24a extends with respect to the terminal connection position 24b of the terminal connection portion 24a.

The tips of the protruding

walls

54a, 54b, 54c and the partition walls 47 (ie, the divided

walls

55a, 55b, 55c) (the ends opposite to the bottom surface 46b of the substrate accommodating recess 46) are closer to the substrate than the

terminal connection portions

23a, 24a. It is located closer to the opening 46a of the housing recess 46 (on the near side in FIG. 4).

ハウジング Furthermore, the housing case 41 has a pair of restricting portions 63 inside the substrate accommodating recess 46. The pair of restricting portions 63 restrict the position of the portion of the terminal connecting portion 23a closer to the distal end than the terminal connecting position 23b in the direction (vertical direction in FIG. 4) orthogonal to the direction in which the terminal connecting portion 23a extends. The pair of regulating portions 63 are provided in the separation groove 47a, and are provided between the dividing wall 55a and the terminal connecting portion 23a and between the dividing wall 55b and the terminal connecting portion 23a, respectively. The pair of restricting portions 63 are integrally provided on the side surfaces of the divided

walls

55a and 55b near the terminal connecting portion 23a. Each of the restricting portions 63 faces a portion of the terminal connecting portion 23a closer to the tip end than the terminal connecting position 23b in a direction (vertical direction in FIG. 4) orthogonal to the direction in which the terminal connecting portion 23a extends. The side surface of each of the restricting portions 63 facing the terminal connecting portion 23a is a restricting surface 63a having a certain distance from the terminal connecting portion 23a. The restricting surface 63a of the restricting portion 63 and the restricting surface 63a of the other restricting portion 63 have a planar shape parallel to the direction of the rotation axis L1 and are parallel to each other. Therefore, the distance D1 between the restriction portions 63 on both sides of the terminal connection portion 23a (that is, the distance between the restriction surfaces 63a) has a constant value along the direction in which the terminal connection portion 24a extends (see FIG. 3). The distance D1 is a distance slightly longer than the thickness T1 of the terminal connection portion 23a. The distance D1 is set according to the size and shape of the pair of holding pieces 75 of the terminal 73 connected to the terminal connection portion 23a. That is, if the distal end portion of the terminal connecting portion 23a is disposed between the pair of regulating surfaces 63a, the distance D1 is set such that the terminal connecting portion 23a has a Is set so as to be inserted between the holding pieces 75.

As shown in FIGS. 3 and 4, the restricting portion 63 is an end of the restricting portion 63 on the opposite side to the tip of the power supply terminal 23 (the end near the terminal insertion port 51 and the right end in FIG. 4). Has an introduction portion 63b. The introduction portion 63b extends from the first end (the end opposite to the distal end of the power supply terminal 23) of the regulating portion 63 along the direction in which the terminal connection portion 23a extends to the distal end side of the power supply terminal 23. (The distance between the introduction portion 63b and the terminal connection portion 23a in the direction orthogonal to the direction in which the terminal connection portion 23a extends) is a portion formed so as to gradually become shorter. In the present embodiment, a portion adjacent to the terminal connecting portion 23a is formed in an arc shape at an end of the regulating portion 63 opposite to the tip of the power supply terminal 23, and this arc-shaped portion serves as the introduction portion 63b. ing. With the introduction portion 63b provided in the regulation portion 63, the ends of the regulation portions 63 on both sides of the terminal connection portion 23a, which are opposite to the tip of the power supply terminal 23, are located between each other as they approach the tip side of the power supply terminal 23. The width of the space is gradually narrowing.

ハウジング The housing case 41 has a pair of regulating portions 64 inside the substrate accommodating recess 46. The pair of restricting portions 64 restrict the position of a portion of the terminal connecting portion 24a closer to the distal end than the terminal connecting position 24b in a direction (vertical direction in FIG. 4) orthogonal to the direction in which the terminal connecting portion 24a extends. The pair of regulating portions 64 are provided in the separation groove 47b, and are provided between the dividing wall 55b and the terminal connecting portion 24a and between the dividing wall 55c and the terminal connecting portion 24a. The pair of restricting portions 64 are integrally provided on the side surfaces of the divided

walls

55b and 55c near the terminal connecting portion 24a. Each of the restricting portions 64 faces a portion of the terminal connecting portion 24a closer to the distal end than the terminal connecting position 24b in a direction perpendicular to the extending direction of the terminal connecting portion 24a (vertical direction in FIG. 4).

規制 The regulating portions 64 provided on both sides of the terminal connecting portion 24a have the same configuration as the regulating portions 63 provided on both sides of the terminal connecting portion 23a. In other words, the side surface of each of the restricting portions 64 facing the terminal connecting portion 24a is a restricting surface 64a having a certain distance from the terminal connecting portion 24a. The distance D2 between the restriction portions 64 on both sides of the terminal connection portion 24a (that is, the distance between the restriction surfaces 64a) has a constant value along the direction in which the terminal connection portion 24a extends. The distance D2 is a distance slightly longer than the thickness T2 of the terminal connection portion 24a. Further, the distance D2 is set according to the size and shape of the pair of holding pieces 75 of the terminal 74 connected to the terminal connection portion 24a. That is, if the distal end portion of the terminal connection portion 24a is arranged between the pair of regulating surfaces 64a, the distance D2 is set such that the terminal connection portion 24a is positioned in a pair by the R shape of the distal end of the holding piece 75 when the control device 71 is assembled. Is set so as to be inserted between the holding pieces 75.

In addition, the restricting portion 64 is provided at the end of the restricting portion 64 opposite to the tip of the power supply terminal 24 (the end near the terminal insertion port 52 and the right end in FIG. 4) similar to the introduction portion 63b. It has an introduction portion 64b that forms a configuration. The introduction portion 64b extends from the first end (the end opposite to the tip of the power supply terminal 24) of the regulating portion 64 along the direction in which the terminal connection portion 24a extends toward the tip end of the power supply terminal 24. (The distance between the introduction portion 64b and the terminal connection portion 24a in the direction orthogonal to the direction in which the terminal connection portion 24a extends) is formed in an arc shape so as to gradually become shorter.

Here, as shown in FIG. 4, the

terminal connecting portions

23a and 24a have a noise reduction member 81 on the base end side of the terminal connection positions 23b and 24b to which the terminals 73 are connected for absorbing and reducing noise. Covered.

は Specifically, as shown in FIG. 6, the noise reduction member 81 covers the

terminal connection portions

23a and 24a while allowing the

terminal connection portions

23a and 24a to bend. The noise reduction member 81 of this embodiment is a rubber member having elasticity in which a ferrite powder as a noise absorbing material and a rubber material are mixed, and is provided in close contact with the

terminal connection portions

23a and 24a without any gap. ing.

ノイズ The noise reduction member 81 is shaped to be able to pass through the

terminal insertion ports

51 and 52. That is, the noise reduction member 81 is formed so as to be included in the outer shape of the

terminal insertion ports

51 and 52 when viewed from the direction in which the

terminal connection portions

23a and 24a extend. In the present embodiment, the brush holder 21 is inserted into the

terminal insertion ports

51, 52 while extending in the same direction as the

terminal connection portions

23a, 24a and holding the base end sides of the

terminal connection portions

23a, 24a. Holding portion 21a. The noise reduction member 81 has a width D3 in a direction perpendicular to the rotation axis L1 that is the same as the width D4 of the holding portion 21a when viewed from the recessed direction of the substrate housing recess 46 (see FIG. 4). The width is set slightly smaller than the width D5 of the

mouths

51 and 52. The width D3 of the noise reduction member 81 is set smaller than the width D6 between the adjacent protruding walls 54a to 54c.

As shown in FIGS. 1 and 2, in the above-described motor 10, the current supplied from the external connector connected to the control device 71 passes through the

terminals

73 and 74, the

power supply terminals

23 and 24, and the power supply brush 22. And supplied to the rotor 11. Then, the rotor 11 rotates. The rotation of the rotor 11 is reduced by the worm 32 that rotates integrally with the rotating shaft 14 and the worm wheel 33 that meshes with the worm 32, and is output from the output shaft 34.

Next, the operation of the present embodiment will be described.
As shown in FIG. 2, when connecting the yoke 12 and the housing case 41 at the time of assembling the motor 10, the yoke 12 with the brush holder 21 fitted in the opening is placed between the flange 12 a and the fixed part 42. Is attached to the housing case 41 so that the brush holder 21 is held therebetween. At this time, the

terminal connection portions

23a and 24a located on the tip side of the

power supply terminals

23 and 24 held by the brush holder 21 are inserted into the

terminal insertion ports

51 and 52, and the terminal insertion portions 48 of the substrate accommodating recess 46 are inserted. Inserted inside. Then, the

terminal connection portions

23a and 24a of the

power supply terminals

23 and 24 and the noise reduction member 81 are arranged inside the terminal insertion portion 48 of the board housing recess 46. In addition, the distal ends of the

power supply terminals

23 and 24 are arranged in the

restriction portions

63 and 64.

In this manner, the

power supply terminals

23 and 24 are arranged at positions where the

terminal connection portions

23a and 24a can be connected to the

terminals

73 and 74, and further, the positions of the parts closer to the distal end than the terminal connection positions 23b and 24b are regulated. The state is controlled by the

parts

63 and 64. In this state, the circuit board 72 is accommodated in the substrate accommodating recess 46 from a direction perpendicular to the direction of the rotation axis L1 (the same direction as the recessed direction of the substrate accommodating recess 46). That is, in a state where the terminal connection positions 23b and 24b are located at positions where the

terminals

73 and 74 inserted together with the circuit board 72 into the board accommodating recess 46 can be clamped, the

terminals

73 and 74 are placed in a direction perpendicular to the direction of the rotation axis L1. It is inserted into the terminal insertion part 48. The terminal 73 sandwiches the terminal connection portion 23a and the terminal 74 sandwiches the terminal connection portion 24a, so that the terminal 73 and the power supply terminal 23 are electrically connected. Are electrically connected.

Next, effects of the above embodiment will be described below.
(1) The

terminal connection portions

23a and 24a are covered by the noise reduction member 81 at positions closer to the base end than the terminal connection positions 23b and 24b where the

terminals

73 and 74 of the circuit board 72 are connected. Therefore, it is possible to suppress the noise generated by the power supply brush 22 from propagating to the circuit board 72 and an external power supply device. In addition, the overall mounting space can be reduced in size as compared with the case where the noise reduction member is provided outside the motor 10.

(2) The noise reduction member 81 covers the

terminal connection portions

23a and 24a while allowing the

terminal connection portions

23a and 24a to bend. Therefore, when connecting the

terminals

73 and 74 to the

terminal connection portions

23a and 24a, the

terminal connection portions

23a and 24a can be bent, and for example, the connection can be easily performed without increasing the dimensional accuracy. That is, if the noise reduction member is provided so as not to allow the

terminal connection portions

23a and 24a to bend, the

terminals

73 and 74 can be easily connected to the

terminal connection portions

23a and 24a unless the dimensional accuracy is made high. However, this can be avoided.

(3) The noise reduction member 81 has elasticity and is provided in close contact with the

terminal connection portions

23a and 24a. Therefore, bending of the

terminal connection portions

23a and 24a is allowed.
(4) The noise reducing member 81 is a rubber member in which ferrite powder as a noise absorbing material and a rubber material are mixed. Therefore, the

terminal connection portions

23a and 24a are easily bent.

(5) The housing case 41 has

terminal insertion ports

51 and 52 through which the

terminal connection portions

23a and 24a are inserted in the same direction as the direction in which the

terminal connection portions

23a and 24a extend. It has a shape that can pass through the

terminal insertion ports

51 and 52. Therefore, the brush holder 21 and the housing case 41 can be assembled with the noise reduction member 81 fixed to the

terminal connection portions

23a and 24a. Therefore, they can be easily assembled.

This embodiment can be implemented with the following modifications. The present embodiment and the following modifications can be implemented in combination with each other within a technically consistent range.
In the above embodiment, the noise reduction member 81 is elastic and provided in close contact with the

terminal connection portions

23a and 24a. However, the present invention is not limited to this. , And may be provided with a gap from the

terminal connection portions

23a and 24a.

Specifically, for example, it may be changed as shown in FIGS. 7 and 8. In this example, the noise reduction member 82 is fixed in advance in the substrate accommodating recess 46 before the

terminal connection portions

23a and 24a are inserted. The noise reduction member 82 has a cylindrical shape having a central hole into which the

terminal connection portions

23a and 24a can be loosely fitted, and is fixed between adjacent protruding walls 54a to 54c. The noise reduction member 82 has a gap S between the

terminal connection portions

23a and 24a when the

terminal connection portions

23a and 24a are inserted and arranged. With this configuration, for example, even if the noise reduction member 82 is a hard member that does not include a rubber material or the like, the

terminal connection portions

23a and 24a are allowed to bend.

In the above embodiment, the noise reduction member 81 covers the

terminal connection portions

23a and 24a while allowing the

terminal connection portions

23a and 24a to bend. However, the present invention is not limited to this. Is a hard member not containing a rubber material or the like, and may be provided in close contact with the

terminal connection portions

23a and 24a.

In the above embodiment, the noise reduction member 81 is a rubber member in which a ferrite powder as a noise absorbing material and a rubber material are mixed, but may be a member having elasticity other than rubber. For example, the noise reduction member may be an elastic resin member in which ferrite powder as a noise absorbing material and a soft resin material are mixed.

In the above embodiment, the noise reduction member 81 absorbs noise. However, any other noise reduction member may be used as long as it can reduce the propagation of noise to the outside.
For example, as shown in FIGS. 9 and 10, the noise reduction member may be a circuit component member 91 provided between the

terminal connection portions

23a and 24a arranged in parallel to increase mutual inductance and capacitance. .

Specifically, the circuit component 91 of this example is made of a bent metal plate. When viewed from the direction in which the

terminal connecting portions

23a and 24a extend (see FIG. 10), the circuit component 91 is formed into a substantially U-shape, and the press-fitting portion 91a into which the

terminal connecting portions

23a and 24a are press-fitted is formed. It has an extending portion 91b which is bent from one end of the press-fitting portion 91a and extends laterally and in a direction approaching each other, and an opposing portion 91c which is bent from the extending portion 91b and faces each other.

In this case, the mutual inductance and the capacitance can be increased in the circuit component member 91 to reduce the common mode noise. Further, since the circuit component 91 is made of a bent metal plate, it can be easily obtained by press working. Further, the circuit component 91 has a configuration in which the

terminal connection portions

23a and 24a have press-fit portions 91a into which the

terminal connection portions

23a and 24a can be press-fitted. be able to. In this configuration, for example, by preparing a plurality of types of circuit components 91, the facing area and facing distance of the facing portion 91c in the circuit components 91 can be easily changed, thereby reducing the mutual inductance and capacitance. It can be easily changed, and common mode noise can be easily and suitably reduced.

Further, the press-fitting portion 91a of the circuit component member 91 has a configuration in which the interval between the pair of parallel walls is set to an interval at which the

terminal connecting portions

23a and 24a can be press-fitted. If the press-fitting is possible, the press-fitting portion may have another configuration.

For example, as shown in FIGS. 11 to 13, the press-fit portion 91a is formed in a substantially U-shape when viewed from the direction in which the

terminal connecting portions

23a and 24a extend (see FIG. 10), and the pair of parallel press-fit portions 91a are formed in parallel. At least one of the walls may have a pressing portion 91d protruding inward. The pressing portion 91d functions so as to press the

terminal connecting portions

23a and 24a, so that the

terminal connecting portions

23a and 24a can be press-fitted into the press-fitting portion 91a. In this example, the pressing portion 91d is cut and raised from one of the parallel walls and protrudes inward. However, another configuration may be used as long as the pressing portion 91d functions similarly. Further, in this example, the pressing portion 91d is configured to be provided in a pair, but the number may be one or three or more. Further, the circuit component member 91 may be fixed to the

terminal connection portions

23a and 24a by a configuration other than the press-fitting portion 91a, for example, by caulking, welding, or screwing. In addition, the circuit component member 91 is made of a bent metal plate material, but is not limited to this, and may have another configuration such as a block-shaped member.

In the above embodiment, the noise reduction member 81 has a shape that can pass through the

terminal insertion ports

51 and 52, but is not limited thereto, and may have a shape that cannot pass through the

terminal insertion ports

51 and 52. . In this case, it is necessary to assemble the

terminal connecting portions

23a and 24a so that the

terminal connecting portions

23a and 24a also pass through the noise reduction member 81 while passing through the

terminal insertion openings

51 and 52.

Although the present disclosure has been described based on the embodiments, it is understood that the present disclosure is not limited to the embodiments and the structure. The present disclosure also encompasses various modifications and variations within an equivalent range. In addition, various combinations and forms, and other combinations and forms including only one element, more or less, are also included in the scope and spirit of the present disclosure.

Claims

A bottomed cylindrical yoke housing (12) containing a rotor (11) inside;
A brush holder (21) for holding a power supply brush (22) for supplying power to the rotor and power supply terminals (23, 24) electrically connected to the power supply brush, and fitted into an opening of the yoke housing; ,
A housing case (41) having a substrate housing recess (46) into which the tip end of the power supply terminal is inserted, and housing a reduction mechanism (31) for reducing the rotation of the rotor and connected to an opening of the yoke housing. )When,
A circuit board (72) having terminals (73, 74) electrically connected to the power supply terminal inside the board housing recess and housed in the board housing recess;
The power supply terminal has a terminal connection portion (23a, 24a) that extends linearly and is disposed in the substrate receiving recess.
The terminal is a forked terminal that is electrically connected to the terminal connection portion from a direction crossing a direction in which the terminal connection portion extends,
A motor in which a portion of the terminal connection portion closer to a base end than a terminal connection position (23b, 24b) to which the terminal is connected is covered with a noise reduction member (81, 82, 91) for reducing noise.
The motor according to claim 1, wherein the noise reduction member (81, 82, 91) covers the terminal connection portion while allowing the terminal connection portion to bend.
The motor according to claim 2, wherein the noise reduction member (81) has elasticity and is provided in close contact with the terminal connection portion.
The motor according to claim 3, wherein the noise reduction member is a rubber member in which a noise absorbing material and a rubber material are mixed.
The terminal connection is one of two terminal connections,
4. The noise reduction member (91) according to claim 1, wherein the noise reduction member (91) is a circuit component member provided between the terminal connection portions arranged in parallel to increase mutual inductance and capacitance. Motor.
The motor according to claim 5, wherein the circuit component is made of a bent metal plate.
The motor according to claim 5 or 6, wherein the circuit component has a press-fit portion (91a) into which the terminal connection portion can be press-fitted.
The housing case has a terminal insertion opening (51, 52) through which the terminal connection portion is inserted in the same direction as the direction in which the terminal connection portion extends,
The motor according to any one of claims 1 to 7, wherein the noise reduction member (81, 91) is provided in a shape capable of passing through the terminal insertion port.
The motor according to claim 2, wherein the noise reduction member (82) is fixed to the substrate housing recess and provided with a gap (S) with the terminal connection portion.