JP2019004619A - Brush motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brush motor capable of suppressing stress on a capacitor and suppressing damage to the capacitor. A brush motor 100 accommodates a brush 31 provided so as to come into contact with a rectifier 13, a capacitor 32 having a terminal 32b connected to a grounding lead wire 34, and the brush 31 and the capacitor 32. A brush holder 30 and a motor case 21 that fits with the brush holder 30 so as to cover the brush holder 30 are provided. Further, the capacitor 32 is grounded by a part of the grounding lead wire 34 being sandwiched between the fitted brush holder 30 and the motor case 21. The brush holder 30 includes a bottom portion 36a that supports a portion 34a that receives stress from the motor case 21 at the time of fitting in a direction opposite to the direction in which the motor case 21 moves. [Selection diagram] Fig. 4

Description

  The present invention relates to a brush motor, and more particularly to a brush motor including a capacitor connected to a grounding lead wire.

  Conventionally, a brush motor including a capacitor connected to a grounding lead is known (see, for example, Patent Document 1).

  The DC motor described in Patent Document 1 is coaxial with the armature, a magnet disposed in the circumferential direction, an armature disposed opposite to the magnet, a shaft inserted and fixed on the rotating shaft of the armature, and the armature. A commutator (commutator) attached to the shaft as described above, a pair of carbon brushes that contact the outer peripheral surface of the commutator, and a wiring that is used to supply power to the carbon brush. The DC motor includes a brush holder that houses a carbon brush, and a noise removing capacitor is disposed in the brush holder. The DC motor includes a metal case. The brush holder is disposed so as to be fitted in the metal case.

  Also, one end of the capacitor and the exposed portion of the wiring are connected by solder. A lead wire is wired from the other end of the capacitor. It is considered that the lead wire at the other end of the capacitor is grounded by being wired outside the brush holder and sandwiched between the fitted metal case and the brush holder.

JP 2012-70512 A

  However, in the DC motor described in Patent Document 1, the brush holder and the metal case are fitted while the lead wire of the capacitor is sandwiched between the brush holder and the metal case, whereby the metal case relative to the brush holder is relative to the lead wire. Stress is applied in the moving direction. For this reason, there is a problem that stress is applied to the capacitor connected to the lead wire, and the capacitor may be damaged.

  The present invention has been made in order to solve the above-described problems, and one object of the present invention is to suppress the stress on the capacitor and to prevent the capacitor from being damaged. Is to provide a simple brush motor.

  To achieve the above object, a brush motor according to one aspect of the present invention includes a rotor including a rotor core and a commutator, a brush provided so as to contact the commutator, and a power supply lead wire that supplies power to the brush. A capacitor having one terminal connected to the ground, and the other terminal connected to the ground lead, a holder for housing the brush and the capacitor, and a metal case fitted to the holder so as to cover the rotor and the holder The capacitor is grounded by sandwiching at least a part of the grounding lead wire between the fitted holder and the metal case, and the holder is used for fitting the metal case to the holder. The portion of the grounding lead wire that receives stress from the metal case is opposite to the direction in which the metal case moves relative to the holder when mated. We include a support portion for supporting the other side.

  In the brush motor according to one aspect of the present invention, as described above, when the holder is fitted with the metal case, the portion of the ground lead wire that receives stress from the metal case is the metal case during fitting. By including a support portion that is supported in the direction opposite to the direction in which the holder moves relative to the holder, the stress that the ground lead wire receives from the metal case is received by the support portion. It is possible to suppress the influence on the connected capacitor. As a result, it is possible to suppress the stress applied to the capacitor connected to the grounding lead wire and to suppress the capacitor from being damaged.

  In the brush motor according to the above aspect, the support portion preferably includes a support surface that extends in a direction orthogonal to a direction in which the metal case moves relative to the holder when fitted.

  With this configuration, stress from the metal case applied to the grounding lead wire can be received by the surface during fitting, effectively suppressing the stress applied to the capacitor connected to the grounding lead wire. can do.

  In the brush motor according to the above aspect, preferably, the holder is provided on the outer diameter side of the first wall portion and the first wall portion having an annular shape in which the capacitor is disposed on the inner diameter side, And a first hole portion into which an end opposite to the side connected to the other terminal of the capacitor is inserted, and the support portion includes a bottom portion of the first hole portion.

  With this configuration, by supporting the ground lead wire by the bottom of the first hole, it is possible to prevent stress from being applied to the capacitor connected to the ground lead wire, and to connect the ground lead. By inserting the end of the wire into the first hole, movement of the end of the grounding lead wire in the direction orthogonal to the direction in which the first hole extends can be restricted.

  In the brush motor according to the above aspect, the holder preferably includes an annular second wall portion on which the capacitor is disposed on the inner diameter side, and the upper end surface of the second wall portion includes a pair of notches, Including a protrusion provided between the pair of notches and on the inner diameter side of the outer diameter edge of the second wall, and the grounding lead wire is connected to the capacitor from one of the notches, the protrusion The second wall portion is wired on the inner diameter side of the second wall portion through the upper end surface of the second wall portion on the outer diameter side and the other of the pair of notches, and the support portion is connected to the outer diameter side of the projection portion. 2 The upper end surface of a wall part is included.

  If comprised in this way, it will suppress that a capacitor | condenser connected to the grounding lead wire is stressed by supporting the grounding lead wire by the upper end surface of the second wall portion on the outer diameter side of the protrusion. be able to. Further, compared to the case where the support portion is provided on the outer diameter side of the second wall portion, the ground lead wire can be supported by the support portion at a position relatively close to the capacitor, so that stress is applied to the capacitor. Can be more effectively suppressed.

  In this case, preferably, the holder includes a second hole portion provided on the inner diameter side of the second wall portion and into which an end portion of the grounding lead wire opposite to the side connected to the capacitor is inserted.

  If comprised in this way, while the said edge part side of a grounding lead wire can be wired to the internal-diameter side of a 2nd wall part, it is orthogonal to the direction where a 2nd hole part is extended by a 2nd hole part. The movement of the end portion of the grounding lead wire in the direction can be restricted.

  In the brush motor in which the holder includes the second wall portion, preferably, the length in the radial direction of the upper end surface of the second wall portion on the outer diameter side of the projecting portion is the length of the second wall portion of the grounding lead wire. It is larger than the length in the radial direction of the portion protruding from the outer diameter edge to the outer diameter side.

  If comprised in this way, the part currently supported by the upper end surface of the 2nd wall part by the side of the outside diameter of a projection part among the parts which receive stress from a metal case among the lead wires for grounding at the time of fitting will be explained. , Larger than the portion not supported by the upper end surface of the second wall portion. As a result, at the time of fitting, the upper end surface of the second wall portion can more stably support the portion of the ground lead wire that receives stress from the metal case. As a result, stress applied to the capacitor connected to the ground lead can be more reliably suppressed, and damage to the capacitor can be more reliably suppressed.

  In the present application, the following configuration is also conceivable in the brush motor according to the above aspect.

(Additional item 1)
That is, in the brush motor in which the holder includes the second hole portion, preferably, the holder includes a third wall portion provided between the second wall portion and the capacitor, and the second hole portion is the third wall portion. Is provided.

  If comprised in this way, while it can control that a capacitor | condenser moves to the 2nd wall part side with a 3rd wall part, a 2nd hole part is provided by the 2nd hole part provided in the 3rd wall part. The movement of the end of the grounding lead wire in the direction orthogonal to the direction in which the wire extends can be restricted. As a result, the number of parts can be reduced as compared with the case where the movement of the capacitor and the movement of the end portion of the grounding lead wire are regulated by separate members.

(Appendix 2)
In the brush motor in which the holder includes the first wall portion, the holder is preferably provided on the outer peripheral surface of the first wall portion and extends in a direction in which the metal case moves relative to the holder when fitted. A portion of the grounding lead wire that is sandwiched between the fitted holder and the metal case is disposed in the groove portion.

  With this configuration, when the ground lead wire is sandwiched between the holder and the metal case, the groove lead portion moves the ground lead wire in the direction intersecting the direction in which the groove portion extends (the circumferential direction of the holder). Can be regulated.

(Additional Item 3)
In the brush motor in which the holder includes a groove portion, the first hole portion is preferably provided in the vicinity of the root of the first wall portion, and the groove portion extends to the inner side surface of the first hole portion. Note that the vicinity of the root of the first wall includes both the position of the root of the first wall and the vicinity of the position of the root of the first wall.

  If comprised in this way, the edge part of the grounding lead wire will move to the direction which cross | intersects the direction where a groove part extends by the groove part in a 1st hole part by the groove part extending to the inner surface of a 1st hole part. Can be regulated. As a result, the stress that the grounding lead wire receives from the metal case can be more effectively received by the support portion.

It is sectional drawing which shows the whole structure of the brush motor by 1st and 2nd embodiment. It is a top view which shows the structure of the holder by 1st Embodiment. FIG. 3 is a partially enlarged view of the vicinity of the capacitor in FIG. 2. It is sectional drawing along the 200-200 line | wire of FIG. It is a perspective view of the vicinity of the 1st hole and groove part by a 1st embodiment. It is a top view of the vicinity of the 1st hole and groove part by a 1st embodiment. It is a top view which shows the structure of the holder by 2nd Embodiment. It is the elements on larger scale of the vicinity of the projection part of FIG. 7, and a pair of notch part. It is sectional drawing along the 400-400 line | wire (line along radial direction) of FIG. FIG. 10 is a partially enlarged view of FIG. 9.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
With reference to FIGS. 1-6, the structure of the brush motor 100 by 1st Embodiment is demonstrated. In the present specification, the “rotation axis direction” means the rotation axis direction (Z direction) of the brush motor 100. The “radial direction” means the radial direction (radial direction) of the rotor 10.

  The brush motor 100 is used to drive a hydraulic pump or the like of a vehicle. The application of the brush motor 100 is not limited to this.

  As shown in FIG. 1, the brush motor 100 includes a rotor 10. The rotor 10 includes a rotor core 11, a winding 12 (for example, enameled wire) wound around the rotor core 11, and a commutator 13. The rotor core 11 is fixed to a rotating shaft 14 (indicated by a broken line). A commutator 13 is also attached to the rotating shaft 14. The one end side and the other end side of the rotating shaft 14 are supported by bearings 15a and 15b, respectively. The rotor 10 includes an insulator 16 (for example, resin) that covers the rotor core 11. The insulator 16 is provided to insulate the rotor core 11 and the winding 12 from each other.

  Further, the brush motor 100 is provided with a permanent magnet (stator) 20 disposed so as to face the rotor core 11. The permanent magnet 20 is provided on the outer diameter side of the rotor core 11.

  Further, the brush motor 100 includes a metal motor case 21 having a cylindrical shape. The permanent magnet 20 is disposed on the inner surface of the motor case 21. The motor case 21 is disposed so as to cover the rotor 10 and a brush holder 30 described later. Further, the motor case 21 is configured to be fitted with the brush holder 30. The brush holder 30 and the motor case 21 are examples of a “holder” and a “metal case” in the claims, respectively.

  As shown in FIG. 2, the brush motor 100 includes a brush holder 30 that houses a brush 31 and a capacitor 32 described later. The brush holder 30 is formed of resin. In addition, the brush motor 100 includes a brush 31 provided so as to come into contact with the commutator 13. Two brushes 31 are provided, and the two brushes 31 are configured as a pair. Note that a capacitor 32, a power supply lead wire 33, a ground lead wire 34, an inductor 106, and a torsion spring 107, which will be described later, are also configured in a pair so as to correspond to the brush 31. In the following, only one of the pair of members described above will be described in detail, but the same applies to the other member.

  The brush 31 is configured to supply power to the commutator 13. Specifically, power is supplied from the brush 31 to the commutator 13 when the end portion on the inner diameter side of the brush 31 contacts the commutator 13.

  Further, the brush holder 30 is provided with a commutator arrangement portion 101 in which the commutator 13 (see FIG. 1) is arranged. The commutator arrangement portion 101 is provided on the inner diameter side of the brush 31. Further, a rotation shaft hole 102 for inserting the rotation shaft 14 (see FIG. 1) is provided on the inner diameter side of the commutator arrangement portion 101.

  In addition, the brush motor 100 includes a capacitor 32 that is provided to remove electrical noise from the brush motor 100. The capacitor 32 has a terminal 32 a (see FIG. 3) connected to a power supply lead wire 33 that supplies power to the brush 31. The capacitor 32 has a terminal 32b (see FIG. 3) connected to a ground lead 34 for grounding the capacitor 32. The terminals 32a and 32b are examples of “one terminal” and “the other terminal” in the claims, respectively.

  A wall 103 is provided in the vicinity of the capacitor 32. The wall 103 has an L shape when viewed from the rotation axis direction. The wall portion 103 is provided so as to face a portion on the inner diameter side of the capacitor 32 and a portion of the capacitor 32 on the side opposite to the capacitor 104 side described later.

  The brush holder 30 is provided with a capacitor 104. Similar to the capacitor 32, the capacitor 104 is provided to remove electrical noise from the brush motor 100. The capacitor 104 is disposed between the two capacitors 32. The capacitor 104 is connected to the power supply lead wire 33 of each of the two capacitors 32. A wall portion 105 is provided in the vicinity of the capacitor 104.

  In addition, the brush holder 30 is provided with an inductor 106 constituted by a power supply lead wire 33. The inductor 106 is provided as a measure against electric noise of the brush motor 100. The inductor 106 is disposed between the capacitor 32 and the brush 31.

  The brush holder 30 is provided with a torsion spring 107. The torsion spring 107 is disposed in the vicinity of the outer diameter side end of the brush 31. One end of the torsion spring 107 is in contact with the outer diameter end of the brush 31. Thereby, since the brush 31 is pressed to the inner diameter side by the torsion spring 107, even if the brush 31 is worn and shortened, the brush 31 and the commutator 13 can be reliably brought into contact with each other.

  Further, the brush holder 30 is provided with a power terminal 108 for supplying power to the power supply lead wire 33. The power from the power terminal 108 is supplied to the power supply lead wire 33 via the wiring 108a (see FIG. 1) (shown by a broken line) inside the brush holder 30.

  The brush holder 30 includes an annular wall portion 35. The wall 35 is provided on the flat surface 109 of the brush holder 30 so as to extend in the Z direction. Each of the brush 31, the capacitor 32, the power supply lead wire 33, the inductor 106, and the torsion spring 107 is disposed on the inner diameter side of the wall portion 35. The power terminal 108 is disposed on the outer diameter side of the wall portion 35. The grounding lead wire 34 is wired from the capacitor 32 disposed on the inner diameter side of the wall portion 35 to the outer diameter side of the wall portion 35. The wall 35 is an example of the “first wall” in the claims.

  As shown in FIG. 3, the upper end surface 35a of the wall part 35 contains the notch part 35b. The grounding lead wire 34 is wired from the inner diameter side to the outer diameter side of the wall portion 35 through the notch portion 35b. Specifically, the ground lead 34 includes a portion extending from the capacitor 32 to the wall portion 35, a portion extending in the Z direction along the inner surface of the wall portion 35, a portion passing through the notch portion 35b, and the wall portion 35. Part extending in the Z direction along the outer peripheral surface 35c (see FIG. 5). In FIG. 3, the motor case 21 is indicated by a broken line.

  The capacitor 32 has a portion 34 a (see FIG. 4) of the ground lead 34, which is wired on the outer diameter side of the wall portion 35, and a portion between the brush holder 30 and the motor case 21. It is grounded by being sandwiched between. When the motor case 21 is fitted to the brush holder 30, the motor case 21 is moved in the Z2 direction, so that the motor case 21 applies stress to the portion 34a in the Z2 direction. The portion 34a is provided so as to extend in the Z direction.

  Further, as shown in detail in FIG. 4, the brush holder 30 includes a hole 36 provided in the flat surface 109. The hole 36 is provided on the outer diameter side of the wall 35 and in the vicinity of the base of the wall 35. Further, an end portion 34b (the end portion on the Z2 direction side of the portion 34a) of the ground lead wire 34 opposite to the side connected to the terminal 32b of the capacitor 32 is inserted into the hole portion 36. Moreover, the hole part 36 has circular shape (refer FIG. 6) seeing from the rotating shaft direction. FIG. 4 is a schematic diagram, and members unnecessary for description are not shown for the sake of simplicity. The hole 36 is an example of the “first hole” in the claims.

  Here, in the first embodiment, the bottom portion 36 a of the hole 36 is fitted with a portion 34 a that receives stress from the motor case 21 in the ground lead 34 when the motor case 21 is fitted to the brush holder 30. The motor case 21 is configured to be supported in a direction opposite to the direction in which the motor case 21 moves (relative to the brush holder 30). The bottom portion 36a is a flat surface. The bottom portion 36a is an example of the “support portion” and “support surface” in the claims.

  Specifically, the bottom portion 36a is provided on the Z2 direction side of the portion 34a (end portion 34b) of the grounding lead wire 34. Before the motor case 21 is fitted, an interval of a predetermined size (for example, 1 mm) is provided between the end portion 34b and the bottom portion 36a. By fitting the motor case 21, the end portion 34b moves to the bottom 36a side and abuts against the bottom 36a. Thereby, the part 34a (end part 34b) is supported by the Z1 direction side by the bottom part 36a.

  In the first embodiment, the bottom 36a extends in a direction orthogonal to the direction in which the motor case 21 moves (relative to the brush holder 30) when the motor case 21 and the brush holder 30 are fitted. It is configured. Specifically, the bottom portion 36a is provided so as to be orthogonal to the direction in which the portion 34a of the grounding lead wire 34 extends. The bottom 36a is provided along the direction in which the flat surface 109 of the brush holder 30 extends.

  As shown in FIG. 5, the brush holder 30 is provided on the outer peripheral surface 35 c of the wall portion 35, and the motor case 21 (relative to the brush holder 30) when the motor case 21 and the brush holder 30 are fitted together. A groove portion 37 extending in the moving direction is included. That is, the groove portion 37 is provided so as to extend in the Z direction. Further, in the groove portion 37, a portion of the grounding lead wire 34 that is sandwiched between the fitted brush holder 30 and the motor case 21 is disposed. Further, as shown in FIG. 6, the groove portion 37 has an arc shape when viewed from the rotation axis direction. In FIGS. 5 and 6, members unnecessary for description are not shown for simplicity.

  As shown in FIGS. 5 and 6, the groove portion 37 extends to the inner side surface 36 b of the hole portion 36. That is, the groove portion 37 is provided so as to extend from the outer peripheral surface 35 c of the wall portion 35 to the inside of the hole portion 36.

(Effect of 1st Embodiment)
In the first embodiment, the following effects can be obtained.

  In the first embodiment, as described above, when the brush holder 30 fits the motor case 21 to the brush holder 30, the portion 34a of the ground lead 34 that receives stress from the motor case 21 is fitted. The brush motor 100 is configured so as to include a bottom portion 36a that is supported on the side opposite to the direction in which the motor case 21 sometimes moves (relative to the brush holder 30). Thereby, since the stress which the grounding lead wire 34 receives from the motor case 21 is received by the bottom part 36a, it can suppress affecting the capacitor | condenser 32 connected to the grounding lead wire 34. FIG. As a result, it is possible to prevent stress from being applied to the capacitor 32 connected to the grounding lead wire 34 and to prevent the capacitor 32 from being damaged.

  Further, in the first embodiment, as described above, the brush motor 100 is such that the bottom 36a extends in a direction orthogonal to the direction in which the motor case 21 moves (relative to the brush holder 30) during fitting. Configure. Thereby, when the motor case 21 and the brush holder 30 are fitted, the stress from the motor case 21 applied to the grounding lead wire 34 can be received by the surface, so that the stress is applied to the capacitor 32 connected to the grounding lead wire 34. Can be effectively suppressed.

  In the first embodiment, as described above, the brush holder 30 is provided on the outer diameter side of the wall portion 35 and the annular wall portion 35 in which the capacitor 32 is disposed on the inner diameter side. The brush motor 100 is configured to include a hole 36 into which an end 34b of the wire 34 opposite to the side connected to the terminal 32b of the capacitor 32 is inserted. Thus, by supporting the ground lead wire 34 by the bottom portion 36a of the hole 36, it is possible to suppress the stress applied to the capacitor 32 connected to the ground lead wire 34, and to connect the ground lead wire. By inserting the end portion 34 b of the hole 34 into the hole portion 36, the movement of the end portion 34 b of the grounding lead wire 34 in the direction orthogonal to the direction in which the hole portion 36 extends can be restricted.

  In the first embodiment, as described above, the brush holder 30 is provided on the outer peripheral surface 35c of the wall portion 35, and the motor case 21 is attached to the brush holder 30 when the motor case 21 and the brush holder 30 are fitted together. A groove 37 extending in the direction of movement (relatively), and a portion of the grounding lead wire 34 sandwiched between the fitted brush holder 30 and the motor case 21 is disposed in the groove 37. Thus, the brush motor 100 is configured. Thereby, when the grounding lead wire 34 is sandwiched between the brush holder 30 and the motor case 21, the grounding lead in the direction (the circumferential direction of the brush holder 30) intersects the direction in which the groove 37 extends by the groove 37. The movement of the line 34 can be restricted.

  In the first embodiment, as described above, the hole 36 is provided near the base of the wall 35, and the brush motor 100 is configured so that the groove 37 extends to the inner surface 36 b of the hole 36. Configure. As a result, the groove portion 37 extends to the inner side surface 36b of the hole portion 36, whereby the groove portion 37 in the hole portion 36 moves the end portion 34b of the grounding lead wire 34 in a direction crossing the extending direction of the groove portion 37. Can be restricted. As a result, the stress received by the ground lead wire 34 from the motor case 21 can be more effectively received by the bottom portion 36a.

[Second Embodiment]
Next, the configuration of the brush motor 300 according to the second embodiment will be described with reference to FIGS. 1 and 7 to 10. In the second embodiment, unlike the configuration of the first embodiment, the ground lead wire 42 is wired so that the end 42 b of the ground lead wire 42 is disposed on the inner diameter side of the wall portion 41. In the drawing, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. The grounding lead wire 42 is configured as a pair so as to correspond to the brush 31. Hereinafter, only one of the pair of grounding lead wires 42 will be described in detail, but the same applies to the other.

  As shown in FIG. 7, the brush motor 300 (see FIG. 1) includes a brush holder 40 that houses the brush 31 and the capacitor 32. The brush holder 40 includes an annular wall 41. The wall 41 is provided on the flat surface 109 of the brush holder 40 so as to extend in the Z direction. Further, each of the brush 31, the capacitor 32, the feeding lead wire 33, the inductor 106, and the torsion spring 107 is disposed on the inner diameter side of the wall portion 41. The power terminal 108 is disposed on the outer diameter side of the wall portion 41. The brush holder 40 and the wall portion 41 are examples of the “holder” and the “second wall portion” in the claims, respectively.

  As shown in FIG. 8, the upper end surface 41a of the wall 41 includes a pair of notches 41b. Further, the upper end surface 41 a of the wall portion 41 includes a protruding portion 41 c provided between the pair of cutout portions 41 b and on the inner diameter side of the outer diameter edge of the wall portion 41. Specifically, the outermost diameter portion of the protruding portion 41 c is located on the inner diameter side with respect to the outer diameter edge of the wall portion 41. In FIG. 8, the motor case 21 is indicated by a broken line.

  The ground lead 42 is connected to the capacitor 32 from one of the pair of notches 41b, the upper end surface 41a (see FIG. 9) of the outer diameter side wall 41 of the protrusion 41c, and the pair of notches 41b. It is wired on the inner diameter side of the wall 41 through the other. That is, the grounding lead wire 42 is wired through the pair of notches 41b by being bent into a U shape when viewed from the rotation axis direction.

  The capacitor 32 includes a brush holder 40 (projection 41c) and a motor in which a portion 42a of the ground lead 42 that is disposed on the upper end surface 41a of the wall 41 on the outer diameter side of the projection 41c is fitted. It is grounded by being sandwiched between the case 21. When the motor case 21 is fitted to the brush holder 40, the motor case 21 is moved in the Z2 direction, so that the motor case 21 applies stress to the portion 42a in the Z2 direction.

  The brush holder 40 includes a wall portion 43 provided between the wall portion 41 and the capacitor 32. That is, the wall 43 is provided so as to face the outer diameter side portion of the capacitor 32. The wall 43 is arranged such that the outer surface 43 a of the wall 43 is in contact with the wall 41.

  Here, in the second embodiment, the brush holder 40 includes a hole 44 provided on the inner diameter side of the wall 41. An end portion 42 b (see FIG. 9) of the grounding lead wire 42 on the side opposite to the side connected to the capacitor 32 is inserted into the hole portion 44. The hole 44 is provided in the wall 43. Specifically, the hole 44 is provided so as to be recessed from the upper end surface 43 b of the wall 43 to the Z2 direction side. Moreover, the hole 44 has a circular shape when viewed from the rotation axis direction. The hole 44 is an example of the “second hole” in the claims.

  Moreover, in 2nd Embodiment, as shown in FIG. 9, when fitting the brush holder 40 and the motor case 21, the upper end surface 41a of the wall part 41 by the side of the outer diameter of the protrusion part 41c is Z1 direction. It is comprised so that it may support to the side. Specifically, the upper end surface 41a of the wall 41 on the outer diameter side of the protrusion 41c is configured to extend in a direction orthogonal to the Z direction. The upper end surface 41a is an example of the “support portion” and “support surface” in the claims. FIG. 9 is a schematic diagram, and members unnecessary for description are not shown for the sake of simplicity.

  In the second embodiment, as shown in FIG. 10, the radial length L <b> 1 of the upper end surface 41 a of the wall portion 41 on the outer diameter side of the protrusion 41 c is the wall portion 41 of the ground lead wire 42. It is larger than the length L2 in the radial direction of the portion protruding from the outer diameter edge to the outer diameter side. That is, when viewed from the rotation axis direction, more than half of the portion 42a of the grounding lead wire 42 overlaps with the upper end surface 41a of the wall portion 41 on the outer diameter side of the protruding portion 41c. In addition, in FIG. 10, illustration of the motor case 21 is abbreviate | omitted for simplification.

  Other configurations of the second embodiment are the same as those of the first embodiment.

(Effect of 2nd Embodiment)
In the second embodiment, the following effects can be obtained.

  In the second embodiment, as described above, the grounding lead wire 42 is connected from the capacitor 32 to one of the pair of notches 41b, the upper end surface 41a of the wall portion 41 on the outer diameter side of the protruding portion 41c, and the pair The brush motor 300 is configured to be wired on the inner diameter side of the wall portion 41 through the other of the notches 41b. As a result, the ground lead wire 42 is supported by the upper end surface 41a of the wall portion 41 on the outer diameter side of the projecting portion 41c, thereby suppressing the stress applied to the capacitor 32 connected to the ground lead wire 42. be able to. Further, compared to the case where the ground lead 42 is supported on the outer diameter side of the wall portion 41, the ground lead 42 can be supported by the upper end surface 41 a at a position relatively close to the capacitor 32. It can suppress more effectively that stress is applied to.

  In the second embodiment, as described above, the brush holder 40 is provided on the inner diameter side of the wall portion 41, and the end of the grounding lead wire 42 opposite to the side connected to the capacitor 32. The brush motor 300 is configured to include the hole 44 into which 42b is inserted. Thereby, the end 42b side of the grounding lead wire 42 can be wired to the inner diameter side of the wall portion 41, and the grounding lead wire in the direction orthogonal to the direction in which the hole portion 44 is extended by the hole portion 44. The movement of the end 42b of 42 can be restricted.

  In the second embodiment, as described above, the radial length L1 of the upper end surface 41a of the wall 41 on the outer diameter side of the protrusion 41c is equal to the outside of the wall 41 of the grounding lead wire 42. The brush motor 300 is configured to be longer than the length L2 in the radial direction of the portion protruding from the diameter edge to the outer diameter side. As a result, when the motor case 21 and the brush holder 40 are fitted to each other, the upper portion of the wall 41 on the outer diameter side of the protruding portion 41c in the portion 42a of the grounding lead wire 42 that receives stress from the motor case 21. The portion supported by the end surface 41 a is larger than the portion not supported by the upper end surface 41 a of the wall portion 41. As a result, when the motor case 21 and the brush holder 40 are fitted, the upper end surface 41a of the wall portion 41 more stably supports the portion 42a that receives stress from the motor case 21 of the ground lead wire 42. be able to. As a result, it is possible to more reliably suppress stress from being applied to the capacitor 32 connected to the grounding lead wire 42, and it is possible to more reliably suppress damage to the capacitor 32.

  Further, in the second embodiment, as described above, the brush holder 40 includes the wall portion 43 provided between the wall portion 41 and the capacitor 32, and the hole portion 44 is provided in the wall portion 43. The brush motor 300 is configured. Thus, the wall 43 can restrict the capacitor 32 from moving toward the wall 41, and the hole 44 provided in the wall 43 in the direction orthogonal to the direction in which the hole 44 extends. The movement of the end 42b of the ground lead 42 can be restricted. As a result, the number of parts can be reduced as compared with the case where the restriction of the movement of the capacitor 32 and the restriction of the movement of the end portion 42b of the grounding lead wire 42 are performed by separate members.

  The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

[Modification]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first and second embodiments, the example in which the support portion (bottom portion 36a) that supports the portion that receives stress from the metal case (motor case 21) has a flat surface shape is shown. Not limited. For example, the support part (bottom part 36a) may be linear.

  In the first and second embodiments, the example in which the support portion (bottom portion 36a) extends in the direction orthogonal to the direction in which the metal case (motor case 21) moves is shown, but the present invention is not limited thereto. Absent. For example, the support part (bottom part 36a) may have a curved shape with respect to the direction in which the metal case (motor case 21) moves.

  Moreover, in the said 1st and 2nd embodiment, although the metal case (motor case 21) was moved at the time of fitting with a metal case (motor case 21) and a holder (brush holder 30 (40)), the example was shown. The present invention is not limited to this. For example, the holder (brush holder 30 (40)) may be moved.

  Moreover, although the example which supports the part which receives the stress of the grounding lead wire by the bottom part of the 1st hole part (hole part 36) was shown in the said 1st Embodiment, this invention is not limited to this. . For example, the portion of the grounding lead wire that receives stress may be supported by the flat surface 109 without the end of the grounding lead wire being inserted into the first hole (hole 36).

  In the said 2nd Embodiment, although the 3rd wall part (wall part 43) was provided between the capacitor | condenser and the 2nd wall part (wall part 41), this invention is not limited to this. . For example, also in the first embodiment, a wall portion may be provided between the capacitor and the first wall portion (wall portion 35).

  In the said 2nd Embodiment, although the lead wire for grounding showed the example in which the upper end surface of a 2nd wall part (wall part 41) contains a pair of notch part, this invention is not limited to this. For example, the upper end surface of the second wall portion (wall portion 41) may include a cutout portion constituted by three or more cutouts.

10 rotor 11 rotor core 13 commutator 21 motor case (metal case)
30, 40 Brush holder (holder)
31 Brush 32 Capacitor 32a Terminal (one terminal)
32b terminal (the other terminal)
33 Lead wire for power feeding 34, 42 Lead wire for grounding 34a, 42a (Stress receiving part)
34b, 42b End portion 35 Wall portion (first wall portion)
35c outer peripheral surface 36 hole (1st hole)
36a Bottom part (support part) (support surface)
36b inner surface 37 groove part 41 wall part (2nd wall part)
41a Upper end surface (support part) (support surface)
41b Notch portion 41c Projection portion 43 Wall portion (third wall portion)
44 hole (second hole)
100, 300 Brush motor L1, L2 Length

Claims (6)

A rotor including a rotor core and a commutator;
A brush provided in contact with the commutator;
A capacitor having one terminal connected to a power supply lead wire for supplying power to the brush, and the other terminal connected to a ground lead wire;
A holder for accommodating the brush and the capacitor;
A metal case fitted to the holder so as to cover the rotor and the holder,
The capacitor is grounded by sandwiching at least a part of the grounding lead wire between the fitted holder and the metal case,
The holder moves a portion of the ground lead wire that receives stress from the metal case when the metal case is fitted to the holder, and the metal case moves relative to the holder when fitted. A brush motor including a support portion that supports a direction opposite to a direction in which to perform the operation.   The brush motor according to claim 1, wherein the support portion includes a support surface that extends in a direction orthogonal to a direction in which the metal case moves relative to the holder during the fitting. The holder is provided on the outer diameter side of the first wall portion with the annular first wall portion on which the capacitor is disposed on the inner diameter side, and the other terminal of the capacitor of the ground lead wire Including a first hole into which an end opposite to the connected side is inserted,
The brush motor according to claim 1, wherein the support portion includes a bottom portion of the first hole portion. The holder includes an annular second wall portion in which the capacitor is disposed on the inner diameter side,
The upper end surface of the second wall portion includes a pair of notches and a protrusion provided between the pair of notches and on the inner diameter side of the outer diameter edge of the second wall portion,
The grounding lead wire extends from the capacitor through one of the pair of notches, the upper end surface of the second wall portion on the outer diameter side of the protrusion, and the other of the pair of notches. Wired on the inner diameter side of the second wall,
The brush motor according to claim 1, wherein the support part includes an upper end surface of the second wall part on an outer diameter side of the protrusion part.   The said holder is provided in the internal diameter side of the said 2nd wall part, The 2nd hole part by which the edge part on the opposite side to the side connected to the said capacitor | condenser of the said grounding lead wire is inserted. 4. The brush motor according to 4. The length in the radial direction of the upper end surface of the second wall portion on the outer diameter side of the protruding portion is the portion of the ground lead wire that protrudes from the outer diameter edge of the second wall portion to the outer diameter side. The brush motor according to claim 4 or 5, wherein the brush motor is larger than a length in a radial direction.

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