JP2017189010A - Armature and DC motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an armature and a DC motor in which contact of a coil and an armature core can be avoided effectively, by modifying the structure of an insulator.SOLUTION: An insulator 29 includes an insulator bottom 29A, an insulator sidewall 29B extending from the insulator bottom 29A along both lateral faces of a tooth body 22a in the circumferential direction, an insulator extension wall 29C extending from the radial outside end of the insulator sidewall 29B so as to cover the surface of a tooth piece 22b facing the radial center side, and an insulator tip wall 29D extending from the insulator extension wall 29C along the radial end of the tooth piece 22b. Circumferential distance between the insulator sidewalls 29B, 29B facing each other while sandwiching the tooth body 22a is set smaller on the insulator bottom 29A side than on the axial end side.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a direct current motor, and more particularly to an armature in which an insulator for insulation is mounted on an armature core and a direct current motor including the armature.

In general, a motor is used as a power source for various mechanisms.
In such a motor, for example, a coil is regularly applied to the armature core to form an armature, and the direction of the current flowing through the coil is switched, so that the rotor side is rotated by the interaction with the field magnet. It is configured.
Generally, an armature core is formed by laminating a plurality of core sheets that are plate bodies. The core sheet has, for example, a configuration in which a plurality of substantially T-shaped plates are radially extended from an annular portion in a radial direction, and in a state where the core sheets are stacked, a plurality of substantially T-shaped plates are formed. Plates are stacked to form a plurality of teeth.
The coil is wound around the teeth so as to cross an axially extending gap (slot) formed between the teeth.

However, when the coil is wound around the teeth as described above, it is necessary to insulate the coil from the teeth (armature core).
As described above, Patent Document 1 discloses a technique that can easily insulate a tooth and a coil (armature core).
Patent Document 1 discloses an insulator for insulating a coil and a tooth (armature core).
Insulators in this technology are respectively inserted into respective slots of the armature core, a cylindrical portion that is inserted into the rotating shaft, a core end surface insulating portion that is formed in the same shape as the end surface (axial end surface) of the laminated core. A slot insulator.
The slot insulating portion is disposed so as to cover the inner wall surface of the slot, and insulates the coil disposed in the slot from the armature core.

JP 2001-286085 A

As described above, in the technique such as Patent Document 1, it is possible to interpose the insulator between the armature core slot and the coil to insulate the portion.
However, in the technique of Patent Document 1, when the coil slightly protrudes from the inside of the slot, it may come into contact with the tip portion of the tooth and cause a short circuit.
That is, after the coil end is formed, the coil may slightly spread to the outer peripheral side, and at this time, there is a concern that it may come into contact with the tip portion of the tooth.
For this reason, in order to reduce the defect rate and reduce the number of rework steps, improvement of the insulator has been demanded.
Further, in the conventional technique, the shape of the insulator is complicated, the installation work is complicated, and improvement of this has been demanded. At the same time, it has been a problem to avoid the deterioration of the fixing property to the armature core and to improve the fixing property.

An object of the present invention is to solve the above problems, and includes an armature that can modify the structure of the insulator and effectively avoid contact between the coil and the armature core, and the armature. It is to provide a direct current motor.
Another object of the present invention is to provide an armature in which the workability and fixing property of an insulator to an armature core are improved and a DC motor including the armature.

  According to the DC motor according to the present invention, the above-mentioned problem is provided with an armature including a cylindrical core base having a rotation shaft inserted through the center, and a plurality of teeth portions projecting radially from the core base. A core, a plurality of insulators covering the armature core from both sides in the axial direction, and a coil wound around the teeth portion with the insulator interposed between the slots between the adjacent tooth portions. The tooth portion includes a teeth body portion extending in a radial direction from the core base body, and teeth pieces respectively protruding in both circumferential directions from an end portion of the teeth body portion. The insulator is aligned with the shape of the axial end face of the armature core, the insulator bottom covering the axial end face, and the insulator main body from the bottom of the insulator. An insulator side wall extending along both side surfaces in the direction, an insulator extending wall extending from the radially outer end of the insulator side wall so as to cover a surface facing the radial center of the teeth piece, and the insulator extension An insulator tip wall extending along the radial end of the tooth piece from the exit wall, and the circumferential distance between the insulator side walls facing each other with the teeth main body interposed therebetween is closer to the insulator bottom side. This is solved by being configured to be smaller than the end portion in the axial direction.

Thus, in this invention, the structure which can coat | cover a teeth part effectively with an insulator was taken.
That is, in the insulator, the insulator tip wall was further extended from the insulator extension wall, and the insulation range was extended to the circumferential end of the teeth piece.
Thereby, even if it is a case where a coil spreads to a radial direction outer side from a slot, it can prevent effectively that a coil contacts the circumferential direction edge part of a teeth piece directly. That is, the portion can be insulated by the intervention of the insulator tip wall.
Therefore, it is possible to effectively avoid contact between the coil and the armature core.
Further, the circumferential distance between the insulator side walls facing each other with the teeth main body interposed therebetween is configured so that the insulator bottom portion side is smaller than the axial end portion side. As a result, since the interval on the insertion side (axial end portion side) is large, the workability of attaching the insulator to the tooth portion is improved, and further, the interval on the bottom side of the insulator is reduced, so that it is firmly fixed to the tooth portion. Since it was made to fix, the fixability to the teeth part of an insulator becomes good.

At this time, specifically, it is preferable that the thickness of the two insulator side wall portions facing each other with the teeth main body portion interposed therebetween is preferably as it decreases from the bottom of the insulator toward the tip. .
When configured in this way, the circumferential distance between the insulator side wall portions facing each other with the teeth main body interposed therebetween is simply configured so that the insulator bottom portion side is smaller than the axial end portion side. be able to.

Further, at this time, a circumferential width of a portion of the insulator bottom portion covering the axial end surface of the teeth main body portion is formed in a tapered shape so as to become narrower from the radial center side toward the distal end side. It is preferable.
When configured in this way, it is possible to reduce the stress by increasing the width on the radial center side where the maximum stress is applied, and to secure the fixability to the tooth portion by reducing the width on the tip side. it can. For this reason, it is possible to reduce the stress and prevent problems such as insulator cracking, and also improve the fixability of the insulator to the tooth portion.

At this time, it is preferable that the axial distances from the bottom of the insulators of the two insulator side walls facing each other with the teeth main body interposed therebetween are different.
If comprised in this way, since an insulator can be attached to an armature core using the insulator side wall portion on the side with a larger axial distance as a guide, the mounting workability is improved.
Furthermore, at this time, specifically, the armature core includes two insulators respectively disposed from the axial base end side and the output side, and one of the insulators from the bottom of the insulator is provided. The axial end of the insulator side wall on the side with the larger axial distance, and the axial end of the insulator side wall on the side with the smaller axial distance from the insulator bottom of the other insulator It is preferable that the two insulators are arranged in a state of being butted against each other.
When configured in this way, when two insulators are mounted on the armature core, the total length in the axial direction of the two insulator side walls becomes the same, and the axial distance between the insulator sidewalls on one side is reduced. The problem of the insulation range being reduced is eliminated.

  A DC motor according to the present invention includes a commutator fixed to the rotating shaft and electrically connected to the coil, a brush that is in sliding contact with the commutator and supplies power to the coil. The armature according to claim 5, and a field magnet disposed so as to face the armature.

According to the present invention, since the insulator tip wall is added and the insulation range is expanded to the circumferential end of the teeth piece, it is possible to effectively prevent the coil from directly contacting the circumferential end of the teeth piece, Reliability can be increased.
Moreover, in the insulator, the space | interval of the insertion side (axial direction edge part side) of the part which coat | covers a teeth part was enlarged, and the space | interval of the insulator bottom part side was made small. For this reason, the workability of attaching the insulator to the tooth portion is improved, and the fixing property of the insulator to the tooth portion is improved.
As described above, according to the present invention, the structure of the insulator can be modified to effectively avoid contact between the coil and the armature core, and both the mounting workability and the fixing property of the insulator are improved. be able to.

It is a schematic block diagram of the motor apparatus for pumps concerning one Embodiment of this invention. It is the schematic diagram which expand | deployed the coil 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 side surface of the armature which concerns on one Embodiment of this invention. It is a top view of the armature concerning one embodiment of the present invention. It is a perspective view of an insulator concerning one embodiment of the present invention. It is explanatory drawing which shows a part of insulator which concerns on one Embodiment of this invention. It is explanatory drawing which shows the protection range of the insulator which concerns on one Embodiment of this invention. It is explanatory drawing which shows the size structure of the part in which the teeth part which concerns on one Embodiment of this invention is stored. It is explanatory drawing which shows the thickness of the insulator which concerns on one Embodiment of this invention. It is explanatory drawing which shows the size structure of the teeth main body coating | coated part 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.
The present embodiment relates to an armature configured to insulate between an armature core and a coil by using an insulator. The insulator is improved by improving the insulator.
And the motor apparatus for pumps which uses the direct current motor provided with this armature as a drive source is excited.

  FIGS. 1 to 10 show an embodiment of the present invention. FIG. 1 is a schematic configuration diagram of a pump motor device, and FIG. 2 is a schematic view in which a coil state of a motor and a brush arrangement position are developed in a planar shape. FIG. 3 is an explanatory view showing the side of the armature, FIG. 4 is a plan view of the armature, and FIG. 5 is a perspective view of the insulator. Note that FIG. 5A and FIG. 5B are views of the insulator viewed from different directions for the sake of explanation. 6 is an explanatory view showing a part of the insulator, FIG. 7 is an explanatory view showing the protection range of the insulator, FIG. 8 is an explanatory view showing the size configuration of the portion where the tooth portion is stored, and FIG. 9 is the meat of the insulator. FIG. 10 is an explanatory view showing the size structure of the teeth main body covering portion.

<Specific application example of motor>
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 suitably used in an antilock braking system. In this apparatus, the rotational force of the motor 10 is converted into the linear reciprocating motion of the piston 32 of the hydraulic pump, and the hydraulic pressure is controlled thereby, whereby the braking force of the brake disk is controlled. .
The configuration will be briefly described below.

The pump motor device S according to the present embodiment is configured by combining the motor unit 1 and the 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 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, an armature core 22 assembled to the rotating shaft 21 so as to be integrally rotatable, a coil 23 wound around the armature core 22, and fixed to the rotating shaft 21 and electrically connected to the coil 23. A commutator 24 to be connected and an insulator 29 attached to the armature core 22 are provided.

Although illustration is omitted, the armature core 22 according to the present embodiment is composed of a plurality of parts divided in the axial direction. For example, the armature core 22 is composed of four parts in the axial direction.
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 magnetic metal plates in the axial direction, and for winding the coil 23 on the outer peripheral side at equal intervals in the circumferential direction. Of 18 teeth 22B. The core sheets of the first to fourth core blocks A to D are connected to each other before and after the axial lamination by a caulking fixing portion that is 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, the component of each teeth part 22B is comprised in the same shape by 1st-4th core block AD.
In addition, the aggregate | assembly of the component of each teeth part 22B in the state which combined these 1st-4th core blocks AD becomes the teeth part 22B.
That is, although the teeth part 22B is a laminated body, when treating this as one piece, it is described as "the teeth part 22B".

  On the inner peripheral side of the armature core 22, the base end portions of the constituent elements of the tooth portions 22 </ b> B are connected to each other in an annular shape, but the first and fourth core blocks A and D and the second core block B are connected. The third core block C differs in the annular shape of the core sheet constituting each block. 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 armature core 22 including the first to fourth core blocks A to D is pressed into the shaft hole of the third core block C, so that the rotation shaft 21 is pressed against the rotation shaft 21. Thus, the third 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.

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 is axially extended. A 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 tooth portion 22B of the armature core 22 corresponds to the segment 24a. Connected to. 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 22B, and the commutator 24 has 18 segments 24a (18 slots and 18 segments).
FIG. 2 shows an example of the electrical connection state of the brush 27, the segment 24a, and the coil 23. FIG. 2 is an explanatory diagram in which the connection state is developed on a plane.
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.

An insulator 29 is attached to the armature core 22 constituting the rotor 20.
In the present embodiment, two insulators 29 are used, and are configured to be mounted on the armature core 22 from the axial output side end and the base end side end, respectively.
The insulator 29 is attached to the armature core 22 so as to cover all the portions where the coil 23 contacts, and the armature core 22 and the coil 23 are insulated by this intervention.
The detailed configuration of the insulator 29 is the main configuration of the present embodiment, and will be described in detail later.

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.

  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 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 a cylindrical shape with a bottom along the axial direction of the rotary shaft 21 in the pump housing 31, and the output bearing 121d. A space size is ensured so that the eccentric part 121b which is provided with the exterior can be eccentrically moved.
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.

<Details of armature>
Next, a portion deeply related to the present invention will be described with respect to the shape of the armature core 22 with reference to FIGS. In particular, the outer structure will be described. As described above, the armature core 22 according to the present embodiment is formed into a three-dimensional shape having a height in the axial direction by stacking a plurality of disk-shaped core sheets in the axial direction. Since the insulator 29 in this embodiment is installed with respect to the armature core 22 in which a plurality of core sheets are laminated and integrated, the armature core 22 will be described below as one component.

The armature core 22 according to the present embodiment includes a substantially cylindrical core base body 22A having an inner hole extending in the axial direction, and a plurality of tooth portions 22B extending radially outward from the outer surface of the core base body 22A. It is configured. As described above, in the present embodiment, 18 teeth portions 22B are formed. That is, they are arranged at equal intervals in the circumferential direction so as to be separated by a central angle of 20 °. The rotating shaft 21 is inserted into the inner hole (hole formed in the axial direction) of the core base body 22A. Since this shape is as described above, the description thereof is omitted.
The teeth portion 22B includes a substantially prismatic tooth main body portion 22a extending radially outward from the outer surface of the core base body 22A, and a tooth piece 22b extending in the circumferential direction from the tip of the tooth main body portion 22a. It is configured.
The teeth piece 22b is a wall extending along the circumferential direction from both sides in the circumferential direction of the distal end (side away from the center) of the teeth main body portion 22a, and is curved in an arc shape.
Therefore, in the axial plan view, the teeth portion 22B has a substantially T shape.
Between the adjacent tooth portions 22B and 22B, a space formed by the side wall of the teeth main body portion 22a facing each other and the inner side surface (surface facing the center direction side) of the tooth piece 22b is formed, and this space is the slot K1. It has become. The adjacent teeth pieces 22b and 22b are separated without contacting each other, and therefore the slot K1 is not a closed space.
In this way, the coil 23 is wound around the tooth main body 22a while crossing the slot K1 with respect to the armature core 22 thus configured (see FIG. 2 for the winding method). That is, the coil 23 is disposed in the slot K1 several times (see FIGS. 3 and 4). 3 and 4, the coils 23 are not illustrated one by one, and a plurality of coils 23 that run in the same place are illustrated together.

<Insulator configuration>
Next, the insulator 29 will be described with reference to FIGS. 3 to 5.
The insulator 29 according to the present embodiment is a resin insulating member, and two are used in the present embodiment.
That is, the insulators 29 and 29 are inserted into the armature core 22 from the axial base end side and the axial output side, respectively.
The insulator 29 includes an insulator bottom portion 29A that covers the axial end surface of the armature core 22, and an insulator side wall portion 29B and an insulator extension wall 29C that extend in the axial direction from the insulator bottom portion 29A. .

The insulator bottom portion 29 </ b> A is formed in a shape (substantially the same shape) that matches the end face shape of the armature core 22. That is, the T-shaped portion extends radially from the annular portion.
A portion of the insulator bottom portion 29 </ b> A that covers the end surface in the axial direction of the core base body 22 </ b> A constituting the armature core 22 is referred to as a “core base body covering portion 291”. Further, a portion covering the axial end surface of the tooth main body portion 22a is referred to as “teeth main body covering portion 292”, and a portion covering the axial end surface of the tooth piece 22b is referred to as “tooth piece covering portion 293”. In addition, the center side edge part of the edge | side which the adjacent teeth main body coating | coated parts 292 and 292 oppose is in contact with the core base coating | coated part 291 in a continuous part.

As shown in FIG. 6, the insulator side wall portion 29 </ b> B is a wall body extending along the axial direction from both sides extending in the radial direction and facing the radial direction in the teeth body covering portion 292, and similarly, the insulator extension wall 29C is a wall body that extends from the teeth piece covering portion 293 in the same direction as the direction in which the insulator side wall portion 29B extends along the axial direction. The insulator side wall 29B and the insulator extending wall 29C are continuous at the end.
Further, the insulator tip wall 29D is a wall body that extends from the radial end portion of the insulator extending wall 29C along the radial end portion of the tooth piece covering portion 293.
That is, the insulator side wall portion 29B extends outward (side away from the center) along the radial direction, and then the outer end (side away from the center) is continuous with the insulator extending wall 29C. 29C takes the structure extended along the inner surface (surface which faces a center side) of the teeth piece 22b. An insulator tip wall 29D that covers the radial end of the tooth piece covering portion 293 extends continuously from the radial end of the insulator extending wall 29C.

Thus, in the present embodiment, the insulator tip wall 29D extends along the circumferential end of the tooth piece covering portion 293, and therefore, contact between the coil 23 and the tooth piece 22b is effectively avoided. can do.
That is, as shown in FIG. 7, even if the plurality of coils 23 arranged in the slot K1 spread outward, the circumferential end of the teeth piece 22b is covered with the insulator tip wall 29D. 23 is not in direct contact with the circumferential end of the tooth piece 22b, but is insulated by a resin insulator tip wall 29D.
Therefore, insulation is improved by providing the teeth piece covering portion 293.

The insulator side wall 29B extends from both sides facing the circumferential direction of the teeth main body covering portion 292. Similarly, the insulator extending wall 29C extends radially in the teeth main body covering portion 292 and in the radial direction. These walls extend in the radial direction from the outer ends (sides away from the center) of both sides facing each other.
That is, two insulator side wall portions 29B, an insulator extending wall 29C, and an insulator tip wall 29D are formed for one tooth main body covering portion 292, but the axial lengths thereof are different. It is configured.
In other words, as shown in FIG. 8, in the teeth main body covering portion 292, the insulator side wall portion 29B, the insulator extending wall 29C, and the insulator tip wall formed on one of both sides extending in the radial direction and facing the circumferential direction. The length in the axial direction of a pair with 29D (referred to as “one pair”) and the pair of the insulator side wall 29B, the insulator extension wall 29C, and the insulator tip wall 29D formed on the other of the two sides (the other pair) The axial length of one set is large (hereinafter, this set is referred to as “large-length wall L1”), and the axial length of the other set is (Hereinafter, the pair on this side is referred to as “small length wall L2”).
When the lengths in the axial direction are different in this way, when the insulator 29 is inserted into the armature core 22, the large length wall L <b> 1 side can be inserted as a guide, so that the insertion arrangement is facilitated.

As described above, in this embodiment, the insulator 29 is inserted into the armature core 22 from the axial base end side and the output side. At this time, the insulator 29 inserted from one side is used. These two insulators 29 and 29 are inserted so that the small length wall L2 of the insulator 29 inserted from the other side is disposed at the place where the large length wall L1 is disposed.
That is, the axial length of the large wall L1 is t1, the axial length of the small wall L2 is t2, and the required axial length (the axial length of the side wall extending in the axial direction of the tooth portion 22B) is set. When t3, the following relationship is established.
t1 + t2≈t3
Therefore, the guide function of the insulator 29 can also be provided while securing the necessary length t3.

Furthermore, as shown in FIG. 9, in this embodiment, the circumferential distance between the insulator side walls 29B and 29B facing each other with the teeth main body 22a interposed therebetween is the circumferential distance t4 on the insulator bottom 29A side. It is comprised so that it may become smaller than the circumferential direction distance t5 of the axial direction edge part side.
That is, the insertion side (distance t5) of the armature core 22 is provided with a conventional opening width in order to prevent deterioration in assemblability, but the width (t4) on the insulator bottom 29A side is slightly small. It is made small and the insulator 29 is prevented from shifting by the force when winding the coil 23. As described above, since the insulator 29 is firmly fitted to the armature core 22, it is possible to effectively prevent the insulator 29 from being displaced and the winding former from being inserted and the coil work from being performed.

As shown in FIG. 9, in this embodiment, in order to change the radial width (distance t5) on the insertion side of the armature core 22 and the radial width (distance t4) on the insulator bottom 29A side, the insulator is changed. The thickness of the side wall portion 29B is changed.
That is, in this way, the thickness t6 on the insulator bottom portion 29A side of the insulator side wall portion 29B is changed to be tapered so that the wall thickness t7 on the end side (insertion side) is larger. Yes. In other words, the surface side facing the tooth main body 22a is a tapered surface, and the circumferential distance t4 on the insulator bottom 29A side is smaller than the circumferential distance t5 on the axial end side.

Moreover, as shown in FIG. 10, the width | variety (radial direction distance) of the teeth main body coating | coated part 292 of 29 A of insulator bottom parts is not constant.
That is, the width (circumferential distance) t8 on the core substrate covering portion 291 side of the teeth body covering portion 292 is configured to be larger than the width (circumferential distance) t9 on the radial end portion side.
By being configured in this way, the width (circumferential distance) of the portion where the maximum stress is applied is increased to reduce the stress burden, and the width on the radial end side (circumferential distance) is reduced as much as possible. The degree of adhesion to the main body 22a can be increased to prevent rattling.

As described above, it is preferable to adjust the sizes of t1, t2, t4, t5, t6, t7, t8, and t9 while balancing each part.
That is, the insulator 29 may be formed by changing the width, height, thickness, etc. so as to satisfy the above-described magnitude relationship.
As described above, since the insulator 29 according to the present embodiment includes the insulator tip wall 29D, the insulation protection range is widened. Therefore, even if the coil 23 spreads from the inside of the slot K1 to the outside when the coil 23 is wound, the coil 23 And the tooth piece 22b are not in direct contact with each other and are insulated by the insulator tip wall 29D.
Moreover, by satisfy | filling said magnitude relationship, while being able to improve the attachment property to the armature core 22 of the insulator 29, the firm fixing property after attachment can also be ensured.

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,
13 .... Magnet, 14 .... Rear bearing, 17 .... Front bearing,
20. Rotor,
22. Armature core,
22A..Core substrate,
22B ··· Teeth portion, 22a · · Teeth body portion, 22b · · Teeth piece,
23 .. Coil, A to D ... 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, 26..Coating part,
27..Brush, 28..Spring,
29. Insulator,
29A..Insulator bottom,
291 .. Core base covering part, 292 .. Teeth body covering part,
293 .. Teeth piece covering part,
29B..Insulator side wall, 29C..Insulator extension wall,
29D · · · insulator tip wall,
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,
H1 ·· Preloading member arrangement space, K1 ·· Slot,
L1 ... Long wall, L2 ... Long wall,
W1 wave washer

Claims (6)

An armature core comprising: a cylindrical core base having a rotation shaft inserted through the center; and a plurality of teeth portions protruding radially from the core base;
A plurality of insulators covering the armature core from both axial sides;
An armature configured to include a coil wound around the teeth portion with the insulator interposed between slots between adjacent teeth portions,
The teeth portion is configured to include a teeth main body portion extending in a radial direction from the core base body, and teeth pieces respectively protruding in both circumferential directions from an end portion of the tooth main body portion,
The insulator is aligned with the shape of the axial end face of the armature core, and covers an insulator bottom portion covering the axial end face, and insulator side wall portions extending from the insulator bottom portion along both circumferential side surfaces of the teeth body portion, An insulator extending wall extending from the radially outer end of the insulator side wall so as to cover a surface facing the radial center of the tooth piece; and from the insulator extending wall to the radial end of the tooth piece. An insulator tip wall extending along the
The armature is configured such that a circumferential distance between the insulator side walls facing each other with the teeth main body interposed therebetween is configured such that the insulator bottom portion side is smaller than the axial end portion side.   2. The armature according to claim 1, wherein a thickness of the two insulator side wall portions facing each other with the teeth main body portion therebetween decreases from the bottom of the insulator toward the tip.   Of the bottom of the insulator, the circumferential width of the portion covering the axial end surface of the teeth body is tapered so as to become narrower from the radial center side toward the tip side. The armature according to claim 1 or claim 2.   The axial distance from the said insulator bottom part of the two said insulator side wall parts which oppose on both sides of the said teeth main-body part differs, The Claim 1 thru | or 3 characterized by the above-mentioned. Armature. Two insulators each disposed from the axial base end side and the output side with respect to the armature core,
One end of the insulator in the axial direction of the side wall of the insulator on the side where the axial distance from the bottom of the insulator is large,
The two insulators are arranged in a state where the other end of the insulator is axially abutted with the axial end of the insulator side wall on the side where the axial distance from the bottom of the insulator is small. The armature according to claim 4, wherein 6. The commutator fixed to the rotating shaft and electrically connected to the coil, a brush that is in sliding contact with the commutator and supplies power to the coil, and the commutator according to claim 1. A DC motor comprising: the armature; and a field magnet disposed so as to face the armature.

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