JP2017093064A - DC motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a DC motor including a structure for increasing the capacity of a choke coil, as a noise prevention element, while reducing the load on the choke coil and the wires.SOLUTION: A brush holder 12 includes a power supply terminal 50 for supplying power to a brush 27, a conductive unit 70 for connecting the power supply terminal 50 and brush 27 electrically. The conductive unit 70 is constituted to have a choke coil 72 wound spirally around the core material, power supply side linear parts 171a, 171b for connecting the choke coil 72 and power supply terminal 50 electrically, and brush connection side linear parts 172a, 172b for connecting the choke coil 72 and brush 27 electrically. A wire holder 40 is provided to face the brush holder 12, and the choke coil 72 is placed while directing the axial direction in the axial direction of the motor.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a DC motor, and more particularly to a DC motor that performs rectification with a brush.

In general, modern automobiles are equipped with various mechanisms in order to provide a comfortable interior space and efficient driving. One of them is, for example, ABS (Anti-lock braking system). Is installed.
As a driving source of this ABS, of course, a driving force may be obtained directly from the engine, but generally a DC motor is often used.
For example, when mounted on an ABS, the rotational force of such a DC motor is converted into a linear reciprocating motion of a piston of a hydraulic pump, whereby the hydraulic pressure is controlled, thereby controlling the braking force of the brake disc. It is configured to be.

Patent Document 1 discloses a motor device that can convert a motor rotational force into a linear reciprocating motion of a plunger (piston).
The motor disposed in the motor unit is assembled to the pump unit and serves as a power source for the ABS.
The motor unit includes a motor, a cup-shaped yoke housing that surrounds the motor and magnets are attached to the inner wall surface, a bearing that rotatably supports the rotating shaft of the motor, a commutator that performs commutation, and the commutator. And a brush holder for holding the brush.
The rotating shaft of the motor is supported at both ends by a non-output side bearing attached to the yoke housing and an output side bearing held by a holding portion arranged at the center of the brush holder. is there.
Further, a brush holder that accommodates a brush that is in sliding contact with the commutator is formed integrally with the end plate on the surface on the opposite side of the end plate that constitutes the motor unit.
This brush is urged toward the opening side, that is, the commutator side by a spring disposed at the bottom side of the brush holder.
The motor unit configured in this manner is attached to the pump unit in the axial direction.
At the time of these attachments, the output-side bearing is held in the holding part, and is in contact with the opening part of the pump part (the opening part of the rotating shaft housing part which is a cup-like recess opening to the motor side). It will be held on the surface.

JP 2006-115612 A

As described above, in the technique such as Patent Document 1, a structure for holding the brush that is in sliding contact with the commutator is employed.
On the other hand, in the motor that performs rectification by the brush as described above, the brush is connected to the power supply terminal by the wire, and current is supplied to the brush from the outside.
However, there is a problem that electromagnetic noise is generated due to switching of the direction of current during rectification and unstable tracking of the contact portion between the brush and the commutator. In order to reduce this, it is common to place a noise prevention element such as a choke coil or a capacitor between the power supply terminal and the brush.
Thus, when arranging the noise prevention element, a wire coil in which a power supply terminal, a brush, a choke coil and the like are integrated with a wire material is used, and the number of parts and cost are reduced. It is arranged in a state of being horizontally placed on a base such as a brush holder (a state in which the axis of the choke coil is along a direction perpendicular to the axial direction). And a wire rod part is hold | maintained at the wire rod holder arrange | positioned with a fixed clearance gap between a brush holder and an axial direction.
On the other hand, there is a demand for increasing the electromagnetic noise reduction effect in the choke coil, and in order to realize such a demand, it is necessary to increase the capacity of the choke coil.
As a method of increasing the capacity of the choke coil, there is a method of adding an iron core to the choke coil (a method of winding a wire around the iron core in a spiral manner to make a choke coil with a core). Increases weight.
However, the choke coil placed horizontally on the brush holder vibrates due to the operation of the motor. However, as the weight of the choke coil increases, there is a problem that the load on the wire coil increases due to this vibration.
Under such circumstances, there has been a demand for development of a technique for increasing the capacity of the choke coil, effectively preventing vibration, and reducing the burden on the choke coil and the wire.

  An object of the present invention is to solve the above-described problems, and has a structure capable of increasing the capacity of a choke coil that is a noise prevention element and reducing the physical burden on the choke coil and the wire. It is to provide a DC motor.

  According to the pump motor device of the present invention, the above-described problem is a rotor that is rotationally driven, a rotary shaft that passes through the rotor in the axial direction, a commutator fixed to the output side of the rotary shaft, A direct current motor including at least a brush that is in sliding contact with a commutator and a brush holder that supports the brush, wherein the brush holder is connected to an external power source to supply power to the brush; and A conductive unit that electrically connects the power supply terminal and the brush. The conductive unit electrically connects the choke coil and the power supply terminal that are spirally wound around a core material. A power supply side linear portion that is a wire to be connected electrically, and a brush connection side linear portion that is a wire to electrically connect the choke coil and the brush. The choke coil further includes a wire rod holder disposed so as to face the brush holder in the axial direction of the rotating shaft, and the choke coil is in a state where the core material extends between the wire rod holder and the brush holder. This is solved by arranging the axial direction of the choke coil in a direction along the axial direction of the rotating shaft.

Thus, in the present invention, the choke coil is wound around the core material, thereby increasing the capacity. And this core material is arrange | positioned toward the direction in which the axial direction of a choke coil follows the axial direction (axial direction of a DC motor) of a rotating shaft in the state ranging between the wire rod holder and the brush holder.
That is, since the core material is sandwiched between the wire material holder and the brush holder, the core material and the choke coil are prevented from vibrating, thereby reducing the burden on the choke coil and the wire material.
In other words, in order to increase the capacity of the choke coil, the core material may be provided, but this increases the weight and increases the energy received by the choke coil and the wire due to vibration.
However, in the present invention, by devising the arrangement direction and arrangement structure of the core material, it is effectively prevented that the core material and the choke coil wound around the core material vibrate. The load due to the physical force applied to the wire (load due to vibration energy) can be effectively reduced.
In addition, as a core material, it is good to use the round bar-shaped thing comprised with magnetic materials, such as an iron core.

  At this time, as described in claim 2, in the brush holder, a brush holder-side recess that is a recess with which one end of the core material engages, or the core on the surface facing the wire holder A claw portion for gripping one end portion of the material is formed, and in the wire material holder, on the surface facing the brush holder, the wire material holder side recessed portion that is a recessed portion with which the other end portion of the core material is engaged Alternatively, it is preferable that a claw portion for holding the other end portion of the core material is formed.

As described above, when the concave portion and the claw portion are formed in the brush holder and the wire rod holder so as to hold both ends of the core material, the core material and the choke coil wound around the core material vibrate more reliably. Therefore, the load on the choke coil and the wire due to vibration can be effectively reduced.
The recess may be any hole, groove, or the like that can fit the end of the core material, and the claw portion may be any protrusion that can grip the end of the core material. Also good.

Further, at this time, as described in claim 3, the wire holder is attached to the brush holder, and a groove is formed on a surface of the wire holder facing the brush holder. It is preferable that at least a part of the brush connection side linear portion is stored and held in the groove portion.
If comprised in this way, a choke coil will be hold | maintained more firmly by holding | maintaining the brush connection side linear part in a groove part.

  Moreover, at this time, as described in claim 4, when the power supply side linear portion, the choke coil, and the brush connection side linear portion are integrally configured by a single wire, The number of points can be reduced and the cost can be reduced.

According to the present invention, in order to increase the capacity, the choke coil is wound around the core material, and the core material extends between the wire material holder and the brush holder, and the axial direction of the choke coil is It arrange | positions toward the direction along the axial direction (axial direction of a DC motor) of a rotating shaft.
For this reason, it is prevented that a core material and a choke coil vibrate, Thereby, the burden concerning a choke coil and a wire is reduced.
In addition, the choke coil is more reliably formed by forming recesses and claw portions for holding both ends of the core material, or holding the wire material for electrically connecting the choke coil and the brush in the groove formed in the wire material holder. And the vibration of a core material is prevented and the said effect is show | played more effectively.
Further, by integrally configuring the choke coil and the wire for connecting the brush and the power supply terminal, the number of parts can be reduced and the cost can be reduced.
As described above, according to the present invention, it is possible to increase the capacity of the choke coil, which is a noise prevention element, to cut electromagnetic noise more effectively, and to reduce the physical burden on the choke coil and the wire.

It is a schematic block diagram of the motor apparatus for pumps concerning one Embodiment of this invention. It is explanatory drawing which shows the brush holder which concerns on one Embodiment of this invention. It is the schematic diagram which expand | deployed the winding state and brush arrangement position of the motor which concern on one Embodiment of this invention in planar shape. It is explanatory drawing which shows the connection state of the electroconductive unit and brush which concern on one Embodiment of this invention. It is a circuit diagram which shows the electrical connection of the noise prevention element which concerns on one Embodiment of this invention. It is explanatory drawing which shows the arrangement | positioning state of the choke coil which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Note that the configuration described below does not limit the present invention and can be variously modified within the scope of the gist of the present invention.
This embodiment can increase the capacity of the choke coil used as a noise prevention element to cut electromagnetic noise more effectively and improve the holding direction of the choke coil to reduce the burden on the wire. It relates to the motor.

1 to 6 show an embodiment of the present invention. FIG. 1 is a schematic configuration diagram of a pump motor, FIG. 2 is an explanatory diagram showing a brush holder, and FIG. 3 is a winding state of a motor and a brush. FIG. 4 is an explanatory diagram showing the connection state of the conductive unit and the brush, FIG. 5 is a circuit diagram showing the electrical connection of the anti-noise element, and FIG. 6 is the arrangement of the choke coil. It is explanatory drawing which shows a state.
First, as a specific application example of a DC motor (referred to as “motor 10”) according to the present invention, a configuration example of a pump motor device S will be briefly described.
The illustrated pump motor device S is a device that is preferably used in an anti-lock braking system, and is configured by combining a motor unit 1 and a pump unit 2.
Note that the output side of the motor 10 is a side to which the power of the motor 10 is transmitted, and in this embodiment is a side toward the pump unit 2. Further, the base end side refers to the opposite side along the axial direction L1 of the rotating shaft 21.

<About the motor unit>
The motor 10 constituting the motor unit 1 is a direct current motor, and is a so-called pump motor in the present embodiment.
FIG. 1 is an explanatory diagram for explaining a schematic configuration of the pump motor device S according to the present embodiment. For the sake of explanation, the internal shape is shown in a partially cut-out portion (preload application portion).

As shown in FIG. 1, the motor 10 is surrounded by a bottomed cylindrical yoke housing 11 as a case member of the motor 10 of the present embodiment, and an opening (disposed on the output side) of the yoke housing 11. Has a basic structure closed with a brush holder 12.
A field magnet 13 is fixed to the inner peripheral surface of the cylindrical portion of the yoke housing 11. In the present embodiment, the magnet 13 has six magnetic poles. A bearing holding portion 11a is formed in the center of the bottom of the yoke housing 11 so as to project inward in a cylindrical shape. A rear bearing 14 is press-fitted into the inner peripheral surface of the bearing holding portion 11a. A rotor 20 is rotatably accommodated inside the magnet 13, and a base end portion of a rotating shaft 21 of the rotor 20 is supported by a rear bearing 14.

  The rotor 20 includes a rotating shaft 21, a rotor core 22 assembled to the rotating shaft 21 so as to be integrally rotatable, a coil 23 wound around the rotor core 22, and a rectification fixed to the rotating shaft 21 and electrically connected to the coil 23. And a child 24.

Although illustration is omitted, the rotor core 22 according to the present embodiment is configured by a plurality of parts divided in the axial direction L1. For example, the rotor core 22 is composed of four parts in the axial direction L1.
In this case, the first core block A, the second core block B, the third core block C (not shown), and the fourth core block D (not shown) are sequentially arranged from the base end side (rear bearing 14 side) of the motor 10. )). The first to fourth core blocks A to D are configured by laminating a plurality of core sheets made of a magnetic metal plate in the axial direction L1, and the coil 23 is wound around the outer peripheral side at equal intervals in the circumferential direction. Eighteen teeth are provided. The core sheets of the first to fourth core blocks A to D are connected to each other before and after lamination in the axial direction L1 by caulking fixing portions that are appropriately provided in the annular portion.
In the present embodiment, the number of salient poles on the rotor 20 side is set to “18” with respect to the number of magnetic poles “6” of the magnet 13. In addition, each teeth part is comprised in the same shape by 1st-4th core block AD.

  On the inner peripheral side of the rotor core 22, the base ends of the teeth portions are connected to each other in an annular shape, but the first and fourth core blocks A and D, the second core block B, and the third core block C The annular shape of the core sheet which comprises each block is varied. In this embodiment, the outer diameter of the annular shape of the core sheet constituting each block is made the same, and the inner diameter is made different.

  For example, in the third core block C, the hole on the inner peripheral side is a shaft hole for press-fitting the rotary shaft 21, and the third core block C press-fits the rotary shaft 21 into the shaft hole. As a result, the rotary shaft 21 is fixed. The first core block A is fixed to the second core block B, the second core block B is fixed to one side of the third core block C, and the fourth core block D is fixed to the third core block C. It is fixed to the other side. That is, the first, second, and fourth core blocks A, B, and D are not directly fixed to the rotating shaft 21 but are indirectly fixed to the rotating shaft 21 through the third core block C.

The inner diameter of the second core block B is smaller than the inner diameter of the inner peripheral hole of the first core block A. For this reason, the second core block B has a base end side. A space is formed by this surface and the side surface of the hole on the inner peripheral side of the first core block A, and this space is referred to as “preloading member disposition space H1”.
The hole of the fourth core block D is used to accommodate a part of the commutator 24.

As described above, the rotor core 22 including the first to fourth core blocks A to D is inserted into the shaft hole of the third core block C so that the rotation shaft 21 is press-fitted to the rotation shaft 21. The 3-core block C is directly fixed, and the first, second, and fourth core blocks A, B, and D are indirectly fixed.
The base end portion of the rotating shaft 21 is rotatably supported by the rear bearing 14, and the outer ring of the rear bearing 14 is press-fitted into the bearing holding portion 11a of the yoke housing 11, whereas the rotating shaft 21 is loosely fitted to the inner ring. Has been. That is, the rotating shaft 21 (the rotor 20) is supported so as to be movable in the axial direction L1.

A wave washer W1 is arranged in the preload member arrangement space H1.
The wave washer W1 is stretched so as to be interposed between the base end side surface of the second core block B and the output side surface of the rear bearing 14 in the preload member disposition space H1, and in the axial direction L1. This preload is applied. That is, the wave washer W1 uses the output side surface of the rear bearing 14 as a fulcrum, and exerts its urging force on the end surface (base end side end surface) of the second core block B so that the rotor 20 moves to the front end side (output side). ).

Further, as shown in FIG. 1, a commutator 24 is fixed to the distal end side of the rotating shaft 21. As shown in FIG. 1, a plurality of segments 24a are fixed to the outer peripheral surface of the commutator 24, and the terminal wire of the coil 23 wound around the teeth portion of the rotor core 22 is connected to the corresponding segment 24a. It is connected. A tip portion of the rotating shaft 21 protruding from the commutator 24 is an output portion 21a.
The output portion 21a includes a coaxial portion 121a that is coaxial with the rotary shaft 21, and an eccentric portion 121b that has an axis at a position shifted from the axis of the rotary shaft 21 (an eccentric position).
A front bearing 17 is disposed on the outer periphery of the coaxial portion 121a, and an output bearing 121d is disposed on the outer periphery of the eccentric portion 121b. In this example, a needle bearing is used as the output bearing 121d.
The front bearing 17 is disposed in the pump housing 31 that constitutes the pump portion 2, and the outer peripheral portion of the output bearing 121 d is disposed so as to contact the piston 32 that constitutes the pump portion 2.

Further, as described above, the rotor 20 has 18 teeth portions, and the commutator 24 has 18 segments 24a (18 slots and 18 segments). Moreover, in this embodiment, the magnet 13 arrange | positioned at the yoke housing 11 which is a stator is comprised so that it may become 6 magnetic poles.
In this embodiment, for example, the pressure equalization line is designed to be 120 ° connection.

The brush holder 12 is attached to the opening of the yoke housing 11 that houses the rotor 20 and the like configured as described above. From the insertion hole 12a provided at the center of the brush holder 12, an output portion 21a provided at the tip of the rotating shaft 21 protrudes to the outside.
In the present embodiment, the insertion hole 12a is composed of three portions having different diameters.
That is, a commutator disposition hole G1 having a diameter that matches the diameter of the commutator 24 is formed on the base end side, and the output side of the commutator disposition hole G1 is slightly smaller than the diameter of the rotary shaft 21. A rotation shaft disposing hole G2 having a large diameter is formed. Further, a bearing arrangement hole G3 having a diameter that matches the maximum diameter of the front bearing 17 is formed on the output side of the rotation shaft arrangement hole G2.
Thus, in the state where the rotation shaft 21 is disposed in the rotation shaft arrangement hole G2, the base end side of the brush holder 12 (the commutator arrangement hole G1) has a base of the commutator 24. A part on the end side is disposed, and a part on the base end side of the front bearing 17 is disposed on the output side (rotary shaft disposing hole G2).

A brush device 25 is formed on the side surface of the base end portion of the brush holder 12.
In the present embodiment, six brush devices 25 are formed.
The brush device 25 has a rectangular cylindrical covering portion 26, and a rectangular parallelepiped brush 27 is accommodated in the covering portion 26 so as to be able to advance and retreat in the radial direction. The brush 27 is configured such that its rear end surface receives the urging force of the spring 28 and presses against the segment 24 a on the outer peripheral surface of the commutator 24. Then, power is supplied to the coil 23 of the rotor 20 through the brush 27 and the commutator 24, and a magnetic field for rotation is generated in the rotor 20.
The brush holder 12 includes a power supply terminal 50 for supplying power from the outside, a capacitor 60, a conductive unit 70 for electrically connecting the brush 27 and the power supply terminal 50, and the like.
The conductive unit 70 is provided with a choke coil 72 that functions as a noise prevention element.
Further, a wire rod holder 40 is provided on the proximal end side of the brush holder 12 so as to be spaced apart in the axial direction L1.
Note that the structure of the brush holder 12 and the arrangement of each member mounted thereon are the main components of this embodiment, and will be described in detail later.

  Further, in the vicinity of the insertion hole 12a formed in the brush holder 12, a brush holder holding portion 12b is integrally formed so as to protrude from the output side surface of the brush holder 12 to the axial direction L1 output side. Embedded in the brush holder holding portion 12b is a wiring / use plate 12c having one end electrically connected to the brush 27. The brush holder 12 has a brush holder holding portion 12 b fixed to the pump housing 31.

<About the pump unit>
Next, the pump unit 2 will be described.
As shown in FIG. 1, the pump unit 2 includes a pump housing 31, and a transmission chamber 31 a for storing an eccentric portion 121 b protruding from the motor unit 1 and an output bearing 121 d on a surface facing the motor unit 1. Is formed. The transmission chamber 31a is a hole bored so as to be recessed in the shape of a bottomed cylinder along the axial direction L1 of the rotary shaft 21 in the pump housing 31 along the axial direction L1 of the rotary shaft 21, and is an output bearing 121d. A space size is ensured so that the eccentric portion 121b that covers the outer wall can be moved eccentrically.
The bottom surface portion of the transmission chamber 31a bored in a substantially cylindrical shape is referred to as “transmission chamber bottom surface portion 311”, and the side surface portion is referred to as “transmission chamber side surface portion 312”.

  The pump housing 31 is formed with a piston accommodating portion 31b that extends radially outward from the transmission chamber 31a. The piston 32 housed in the piston housing part 31b is in contact with the output bearing 121d in the radial direction of the eccentric part 121b, and slides in the piston housing part 31b as the rotor 20 rotates. As the piston 32 slides, the fluid in the hydraulic chamber 31c communicating with the piston accommodating portion 31b is pressurized, and the hydraulic oil filled in the hydraulic chamber 31c is pumped.

<Assembly of motor part and pump part>
The motor unit 1 configured as described above is assembled to the pump unit 2.
At this time, the brush holder holding portion 12 b constituting the brush holder 12 is fixed to the pump housing 31.
In addition, the eccentric portion 121b on which the output bearing 121d is packaged is disposed inside the transmission chamber 31a. At this time, the outer wall of the output bearing 121 d is in contact with the end of the piston 32.
And the front bearing 17 is attached so that the opening end by the side of the motor part 1 arrangement | positioning in the transmission chamber 31a may be obstruct | occluded. That is, it is attached in the vicinity of the open end of the transmission chamber side surface portion 312 constituting the transmission chamber 31a.
More specifically, the front bearing 17 is mounted on the side surface portion 312 of the transmission chamber that constitutes the transmission chamber 31a in the state where the base end portion thereof is arranged in the bearing arrangement hole G3 formed in the brush holder 12. It is done.
Since the motor unit 1 is assembled to the pump unit 2, the rotating shaft 21 is rotatably supported by the rear bearing 14 and the front bearing 17, and in the transmission chamber 31 a. The eccentric part 121b and the output bearing 121d can be arranged to transmit the rotational force of the rotary shaft 21 to the eccentric part 121b and the output bearing 121d.
Thus, the output bearing 121d applies a driving force to the piston 32 via the eccentric portion 121b.

<About the brush holder and the members mounted on it>
Next, the arrangement of the brush holder 12 and members mounted thereon will be described with reference to FIGS.
FIG. 2 illustrates the brush holder 12 and is an explanatory view of the brush holder 12 viewed from the base end side. Note that members and the like that are not directly related to the present embodiment are omitted in order to emphasize the main parts of the present embodiment.
As described above, the brush holder 12 includes the base plate 12A, which is an annular plate having an insertion hole 12a formed at the center, and a plurality of brush devices 25 that protrude from the side surface of the base end of the base plate 12A. And as a basic configuration. In the present embodiment, six brush devices 25 are arranged. The six brush devices 25 are arranged radially from the center of the base plate 12A, and the adjacent brush devices 25, 25 are separated by a central angle of 30 °.
In the present embodiment, six brushes 27 are used to apply the arrangement of the brushes 27 and the segments 24a and the winding state as shown in FIG.

As shown in FIG. 2, the brush device 25 is configured to have a rectangular cylindrical covering portion 26, and a rectangular parallelepiped brush 27 is accommodated in the covering portion 26 so as to advance and retreat in the radial direction. The brush 27 has a rear end face pressed toward the commutator 24 by a spring 28 (not shown in FIG. 2).
From this brush 27, a pigtail P1 for power supply projects.
The brush holder 12 is mounted with a power supply terminal 50 for supplying power from the outside, a capacitor 60, a conductive unit 70 for electrically connecting these members, and the like.
The power supply terminal 50 is a long terminal and includes an anode power supply terminal 50A and a cathode power supply terminal 50B. The anode power supply terminal 50A and the cathode power supply terminal 50B are arranged in a state of passing through two through holes formed in the base plate 12A in the axial direction L1.

The conductive unit 70 includes a linear portion 71 and a choke coil 72.
In the present embodiment, the linear portion 71 and the choke coil 72 are integrally formed. In other words, the conductive unit 70 is configured by molding a single wire into a predetermined shape (coil shape and curved shape).
In the present embodiment, a conducting wire having a circular cross section is used as the wire. In addition, the outer periphery of the said conducting wire is coat | covered with the insulating film, and what is called a covered conducting wire (insulated electric wire) is used.
Thus, the choke coil 72 according to the present embodiment is configured by winding a wire in a spiral shape, and the choke coil 72 is formed in the conductive unit 70 from the linear portion 71 according to the present embodiment. A point other than the point where it is.

The conductive unit 70 is also provided with two types of anode conductive unit 70A connected to the anode power supply terminal 50A and cathode conductive unit 70B connected to the cathode power supply terminal 50B.
Hereinafter, members constituting the anode conductive unit 70A are referred to as “anode linear portion 71A” and “anode choke coil 72A”, and similarly, members constituting the cathode conductive unit 70B are referred to as “cathode use”. The linear portion 71B ”and the“ cathode choke coil 72B ”will be described.
The anode-side brush 27 is referred to as “anode brush 27A”, and the cathode-side brush 27 is referred to as “cathode brush 27B”.
The anode choke coil 72A and the cathode choke coil 72B are wound around the cores 72a and 72a, which are core materials, so that the magnetic flux is increased and the capacity is increased.

The configuration of the conductive unit 70 will be described with reference to FIG.
Since the anode conductive unit 70A and the cathode conductive unit 70B have the same configuration, only the anode conductive unit 70A will be described in order to avoid duplication of description.
As shown in FIG. 4, the anode power supply terminal 50A is electrically connected to the end of the anode linear portion 71A extending from one end of the anode choke coil 72A (hereinafter referred to as anode power supply terminal 50A). The anode linear portion 71A extending to the side is referred to as “anode connection side linear portion 171a”).
In the connection portion, the insulating coating covering the outer periphery of the anode linear portion 71A is peeled off, and the internal conductor and the anode power supply terminal 50A are connected.
An anode linear portion 71A (hereinafter referred to as “anode other end side linear portion 172a”) extending from the other end portion side of the anode power supply terminal 50A is curved in a partial circumferential shape, and includes three pieces. The ends of three pigtails P1 projecting from the anode brush 27A are connected. As for the connection portion, the internal conductor and the pigtail P1 are connected in the same manner as described above.
Due to such a configuration, the anode power supply terminal 50A and the three anode brushes 27A are electrically connected.
On the cathode side, a portion corresponding to “anode connection side linear portion 171a” is referred to as “cathode connection side linear portion 171b”, and a portion corresponding to “anode other end side linear portion 172a” is referred to as “cathode other end side linear portion 172a”. Side linear portion 172b ".
Further, as shown in FIG. 2, a capacitor 60 is electrically connected to the anode power supply terminal 50A.
Similarly, in the cathode conductive unit 70B, the cathode power supply terminal 50B and the three cathode brushes 27B are electrically connected, and the capacitor 60 is also electrically connected to the cathode power supply terminal 50B. ing.

Next, the configuration of the wire holder 40 will be described with reference to FIG.
The wire rod holder 40 according to the present embodiment has a semi-annular plate body made of an insulating synthetic resin material as a basic configuration.
This wire rod holder 40 covers the top surfaces of the four brush devices 25 other than the brush devices 25, 25 arranged so as to sandwich the power supply terminal 50 (the surface disposed on the base end side is the top surface). It is provided and is divided into two in the radial direction.
That is, the wire rod holder 40 is configured by combining the first wire rod holder 40A and the second wire rod holder 40B.
In the present embodiment, the second wire rod holder 40B has an outer diameter such that the outer circumference follows the outer circumference of the base plate 12A, and the inner diameter extends from the central axis to the radial intermediate position of the brush device 25 arranged radially. It is a member of a partial annular shape set to the length of.
The first wire rod holder 40 </ b> A has a partially annular shape in which the outer diameter is set to be the same as the inner diameter of the second wire rod holder 40 </ b> B, and the inner diameter is set to the length to the inner end position in the radial direction of the brush device 25. It is a member.

Near the central portion of the inner periphery of the first wire rod holder 40A, a first wire rod holder cutout portion 141a cut into a U-shape is formed, and at both ends of the first wire rod holder cutout portion 141a, Restriction protrusions 25a and 25a formed so as to protrude from the inner end portion of the top surface of the adjacent brush devices 25 and 25 toward the base end portion are engaged.
The restricting protrusions 25a, 25a are adjacent to each other at the center of the four brush devices 25 other than the brush devices 25, 25 arranged so as to sandwich the power feeding terminal 50, The first wire rod holder 40A is fixed by engaging these restricting protrusions 25a, 25a with both ends of the first wire rod holder notch portion 141a in the circumferential direction.
Further, a first wire rod holder groove 142a formed along the circumference is formed on a surface facing the output side of the first wire rod holder 40A (a surface facing the base plate 12A), and this first wire rod holder groove portion is formed. 142a stores and holds the other end side linear portion 172a for the anode.

Also, a second wire rod holder notch portion 141b cut out in a U-shape is formed in the vicinity of the center of the outer periphery of the second wire rod holder 40B. The second wire rod holder notch portion 141b includes a base plate. A restricting plate 12e is formed so as to protrude from 12A so as to stand up toward the base end.
Further, a second wire rod holder groove 142b formed along the circumference is formed on a surface facing the output side of the second wire rod holder 40B (a surface facing the base plate 12A), and this second wire rod holder groove portion is formed. 142b stores and holds the cathode other end side linear portion 172b.

The wire rod holder 40 configured as described above holds the anode other end side linear portion 172a and the cathode other end side linear portion 172b, and is arranged in four other than the brush devices 25 and 25 arranged so as to sandwich the power supply terminal 50 therebetween. While being placed on the individual brush devices 25, the restricting projections 25a, 25a are engaged with the first wire holder notch 141a, and the restricting plate 12e is fitted with the second wire holder notch 141b. As a result, the brush holder 12 is attached.
Therefore, as shown in FIG. 5, the choke coil 72 and the capacitor 60, which are noise prevention elements, are electrically connected to the pair of brushes 27 and 27.

Next, a method of attaching the choke coil 72 to the brush holder 12 and the wire rod holder 40 configured as described above will be described with reference to FIGS.
As shown in FIG. 2, the wire material holder side recesses 143 are formed at both ends in the circumferential direction of the wire material holder 40. This wire material holder side recessed part 143 is a recessed part (hole) bored from the surface facing the output side of the wire material holder 40 toward the base end side in the axial direction L1, and the inner diameter thereof is substantially equal to the outer diameter of the iron core 72a. It is comprised so that it may become the same.
One side (anode side) of the wire holder side recess 143 formed at both ends in the circumferential direction is referred to as “anode wire holder side recess 143a”, and the other side (cathode side) is “cathode wire holder side recess 143b”. ".

In addition, two brush holder-side recesses 12 f that are drilled toward the output side are formed on the surface of the brush holder 12 that faces the base end side.
Of these two brush holder side recesses 12f, the side formed immediately below the anode wire holder side recess 143a (directly below in the axial direction L1) is referred to as “anode brush holder side recess 1201a”, and the cathode wire holder The side formed immediately below the side recess 143b (immediately below in the axial direction L1) is referred to as “cathode brush holder side recess 1201b”.
The length of the iron core 72a in the longitudinal direction is the distance between the anode wire holder side recess 143a and the anode brush holder side recess 1201a (between the cathode wire holder side recess 143b and the cathode brush holder side recess 1201b). The distance is also the same).

In the present embodiment, the anode wire holder side recess 143a and the cathode wire holder side recess 143b are formed on the first wire holder 40A side, but the present invention is not limited to this. It may be formed on the two wire rod holder 40B side, or may be formed on each of the first wire rod holder 40A and the second wire rod holder 40B. That is, the selection may be made appropriately in consideration of the arrangement balance with other components.
In the present embodiment, the anode wire holder side recess 143a, the cathode wire holder side recess 143b, the anode brush holder side recess 1201a, and the cathode brush holder side recess 1201b are formed as recesses. Any configuration may be used as long as both ends of the core 72a as the core material can be held.
For example, it is good also as a structure which hold | grips the both ends in the axial direction L1 of the iron core 72a by protrudingly providing the nail | claw part for holding | grip.

As shown in FIG. 6, the choke coil 72 has a wire rod holder with both ends of the iron core 72a inserted through the choke coil 72 inserted into the wire rod holder side recess 143 and the brush holder side recess 12f, respectively. It will be fixed in the state spanned between the side recessed part 143 and the brush holder side recessed part 12f.
In other words, the choke coil 72 has the axial line L2 oriented in the direction along the axial direction L1 of the motor 10 and the both ends of the iron core 72a inserted through the choke coil 72 are connected to the wire holder side recess 143 and the brush holder. It is fixed between the brush holder 12 and the wire rod holder 40 by being inserted into the side recess 12f.
As described above, in the present embodiment, two choke coils 72 are provided for the anode and the cathode, and therefore the anode choke coil 72A includes the anode wire holder side recess 143a. The cathode choke coil 72B is fixed so as to be sandwiched between the anode brush holder side recess 1201a, and the cathode choke coil 72B is fixed so as to be sandwiched between the cathode wire holder side recess 143b and the cathode brush holder side recess 1201b. .

The choke coil 72 (the anode choke coil 72A and the cathode choke coil 72B) is wound around the iron cores 72a and 72a, thereby increasing the capacity.
And as shown in the said structure, the iron cores 72a and 72a are arrange | positioned so that it may stand along the axial direction L1 (from the base plate 12A to the base end part side) along with this, and in connection with this. The choke coils 72 (the anode choke coil 72A and the cathode choke coil 72B) are also arranged so that the direction of the axis L2 is along the same direction.
Since it is configured as described above, the choke coil 72 (the anode choke coil 72A and the cathode choke coil 72B) is reliably fixed between the brush holder 12 and the wire rod holder 40 via the iron core 72a. Vibration (especially vibration in the axial direction L1) is effectively suppressed.
Since vibration is suppressed in this way, even if the weight is increased by providing the iron core 72a, it is possible to effectively prevent a large load from being applied to the linear portion 71.
In addition, since the choke coil 72 (the anode choke coil 72A and the cathode choke coil 72B) is held with a simple configuration, it is advantageous in terms of both assembly work efficiency and cost.

S .... Pump motor device, 1 .... Motor part, 2 .... Pump part,
10. ・ Motor (DC motor),
11.Yoke housing, 11a ... Bearing holding part,
12 .... Brush holder, 12A ... Base plate,
12a .. insertion hole, G1 .. commutator arrangement hole, G2 .. rotation shaft arrangement hole, G3 .. bearing arrangement hole,
12b .. Brush holder holding part, 12c .. Wiring combined plate,
12e ・ ・ Regulation board,
12f..Brush holder side recess,
1201a ··· Brush holder side recess for anode, 1201b ··· Brush holder side recess for cathode,
13 .... Magnet, 14 .... Rear bearing, 17 .... Front bearing,
20 .. Rotor, 22 .. Rotor core, 23 .. Coil, AD, Core block,
21 .. Rotating shaft, 21a .. Output part, 121a .. Coaxial part, 121b .. Eccentric part,
121d .. Bearing for output,
24 .. Commutator, 24a .. Segment,
25 .. Brush device, 25a .. Restriction protrusion, 26 .. Cover part,
27 .. Brush, 27A .. Anode brush, 27B .. Cathode brush,
P1, Pigtail, 28, Spring,
31. Pump housing,
31a ··· transmission chamber, 311 ··· bottom portion of transmission chamber, 312 ·· side portion of transmission chamber,
31b..Piston housing part, 31c..Hydraulic chamber, 32..Piston,
40..Wire material holder,
143 .. Concave portion on the wire material holder side,
143a ··· Wire rod holder side recess for anode, 143b · · Wire rod holder side recess for cathode,
40A .. 1st wire rod holder,
141a ... first wire holder notch, 142a ... first wire holder groove (groove),
40B .. Second wire rod holder,
141b ··· second wire holder holder notch, 142b · · second wire holder groove (groove),
50 ... Power supply terminal
50A ... Feeding terminal for anode, 50B ... Feeding terminal for cathode,
60 .. Capacitor,
70 .. Conductive unit,
70A ... Conductive unit for anode, 70B ... Conductive unit for cathode,
71..Linear part,
71A .. Linear part for anode,
171a .. anode connection side linear part (feeding side linear part),
172a .. the other end side linear part for anode (brush connection side linear part),
71B .. Linear part for cathode,
171b .. Cathode connection side linear part (feeding side linear part),
172b .. the other end side linear part for cathode (brush connection side linear part),
72 .. Choke coil, 72a .. Iron core (core material),
72A ... Choke coil for anode, 72B ... Choke coil for cathode,
H1 ... Preloading member installation space,
W1 wave washer

Claims (4)

A rotor that is driven to rotate, a rotating shaft that passes through the rotor in the axial direction, a commutator fixed to the output side of the rotating shaft, a brush that is in sliding contact with the commutator, and a brush holder that supports the brush A DC motor comprising at least
The brush holder is provided with a power supply terminal that is connected to an external power source and supplies power to the brush, and a conductive unit that electrically connects the power supply terminal and the brush,
The conductive unit electrically connects a choke coil spirally wound around a core material, a power supply side linear portion that is a wire material that electrically connects the choke coil and the power supply terminal, the choke coil, and the brush. And a brush connection side linear portion that is a wire material to be connected in a connected manner,
A wire rod holder arranged to face the brush holder in the axial direction of the rotary shaft;
The choke coil is arranged such that the axial direction of the choke coil is in a direction along the axial direction of the rotating shaft, with the core material extending between the wire holder and the brush holder. DC motor characterized by In the brush holder, a brush holder side concave portion that is a concave portion with which one end portion of the core material engages or a claw portion that grips one end portion of the core material is formed on a surface facing the wire rod holder. And
In the wire rod holder, on the surface facing the brush holder, there is a wire rod holder side concave portion that is a concave portion with which the other end portion of the core material is engaged, or a claw portion that holds the other end portion of the core material. The direct current motor according to claim 1, wherein the direct current motor is formed. The wire holder is attached to the brush holder;
In the wire rod holder, a groove portion is formed on a surface facing the brush holder, and at least a part of the brush connection side linear portion is stored and held in the groove portion. The DC motor according to claim 1 or 2. 4. The power supply side linear portion, the choke coil, and the brush connection side linear portion are integrally configured by a single wire. 5. The described direct current motor.

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