JPH0446547A - Motor - Google Patents

Abstract

PURPOSE:To obtain shorter motors and facilitate the assembly work by connecting terminal boards to brushes by the first and second wiring plates made of thin plate material, and by connecting each brush to above-mentioned each wiring plate directly. CONSTITUTION:Brushes 44A-44D for four poles are wired on one side of an insulators 41, and wiring plates 50, 52 made of thin plate material are fixed on the other side. And a wiring plate 50 is connected to each of the negative- electrode-side brushes 44B and 44D on the same surface, while the wiring plate 52 is connected to each of the positive-electrode-side brushes 44A and 44C. In this way, each wiring plate is made of thin plate material, fixed to the insulator into one united body, and connected to each brush on the same surface. Accordingly, the overall length of the motor can be shortened. Besides, each brush for the four poles is directly connected to a wiring plate and the wiring plates are connected to lead wires through the medium of electrode terminals 60, 70. Accordingly, the number of spots to be connected reduces and the assembly work can be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a motor in which a plurality of brushes are held on a brush substrate fixed to the inner bottom of an outer frame of the motor.

[Prior Art] Motors for electric pumps used to drive fluid pumps that forcefully pump fluids such as oil are designed to reduce the axial force dimension (overall length) or improve ease of assembly in narrow spaces. Therefore, one end of the rotating shaft of the rotor is cantilevered by the pump housing, and a brush board holding a brush that slides in contact with the commutator is disposed at the other end of the rotating shaft. This brush board is attached to the end of the yoke together with the end plate 1, and then fixed by caulking the yoke, and forms an outer frame that accommodates the rotor of the motor. Further, a four-pole brush is held on the brush substrate. Each brush is connected to a terminal plate that is fixed through the brush board, and each terminal plate is connected to two pairs of crossover wires that face each other. The configuration is such that each brush is energized via these crossover wires and terminal boards.

[Problems to be Solved by the Invention] Incidentally, in such a conventional motor, the terminal plate for supplying current to each of the four-pole (one pair two pairs) brushes is simply fixed by penetrating the brush board. Therefore, the terminal plate is disposed so as to protrude outward in the axial direction of the motor, and a gap with the end plate is essential to prevent a short circuit, resulting in an increase in the overall length of the motor. In addition, the pair of crossover wires connected to these terminal boards are
The structure was such that it was held by a grommet and pulled into the yoke, and then casually connected to the terminal board.
Both crossover wires are arranged to cross each other near the brush board in the yoke, which also causes the overall length of the motor to become longer.

Furthermore, with conventional motors, the work of connecting the brush and the terminal board and the work of connecting the terminal board and the crossover wire are complicated, and the ease of assembly is also poor when fixing the brush board to the yoke together with the end plate. There were drawbacks.

The present invention has been made in consideration of the above-mentioned facts, and an object of the present invention is to obtain a motor whose overall length can be shortened and whose ease of assembly is improved.

[Means for Solving the Problems] The motor of the invention according to claim (1) is a motor in which a plurality of brushes are held on a brush substrate fixed to the inner bottom of a yoke having a cylindrical shape with a bottom, a first wiring plate made of a thin plate material, integrally fixed to the brush substrate, and to which one of the brushes of the plurality of brushes is connected; a second wiring plate to which a brush of the other pole among the plurality of brushes is connected;
The brush is characterized in that a motor drive current is supplied to the brush via the wiring plate.

The motor of the invention according to claim (2) is the motor according to claim (1), wherein a convex portion that engages and holds the brush substrate is integrally formed on the bottom of the yoke, and the convex portion The negative electrode side wiring plate of the brush board is electrically connected to and fixed to the yoke.

The motor of the invention according to claim (3) is the motor according to claim (1) or claim (2), comprising: electrode terminals integrally formed to protrude from the first and second wiring plates, respectively; an insertion part formed at the bottom of the yoke corresponding to the electrode terminal and into which the electrode terminal is inserted; an insulating member that insulates the electrode terminal and the yaw and supports the electrode terminal in the insertion part; The present invention is characterized in that it comprises a connector portion for supplying electricity to the first and second wiring plates via the electrode terminals.

[Function] In the motor in which the brush board is fixed to the inner bottom of the bottomed cylindrical yoke according to claim (1), electricity is supplied to the plurality of brushes via the first and second wiring plates. Here, since each wiring plate connects the terminal plate and the brush using a thin plate material, the brush board does not require a space for accommodating the crossover wire, and has a thin dimension and shape as a whole in the motor axis direction. Therefore, the total length of the motor can be shortened.

Further, since each of the plurality of brushes is directly connected to the first and second wiring plates, the number of connection points is reduced compared to the conventional case, and therefore the assembly work efficiency is improved.

In the motor according to claim (2), the brush substrate can be fixed to the yoke by simply engaging the convex portion, and the negative electrode side wiring plate can be electrically connected to the yoke, thereby improving ease of assembly.

In the motor according to claim (3), the electrode terminal integrally formed on the wiring plate is directly pulled out of the yoke via the insertion portion. Therefore, there is no need for extra space for terminal boards or crossing wires as in the past, and the overall length of the motor can be shortened.

In addition, the number of parts and connection points are reduced compared to the conventional method, and assembly work efficiency is improved.

[Example] FIG. 1 shows a vehicle electric pump motor 10 according to the present invention.
A cross-sectional view of the whole is shown.

In the motor 10, an armature shaft 14 of an armature (rotor) 12 is supported by a pump housing 16 by a bearing 18, and a distal end of the armature shirt 14 is connected to a pump section 20. A commutator 22 is attached to the other end of the armature shaft 14, and brushes 44A, 44B, 44C, and 44D attached to a brush board 40, which will be described in detail later, come into contact with it.
ing. The pump housing 16 also has an armature 1.
2. Brushes 44A, 44B, 44C, 44D.

A yoke 24 is fixed while accommodating a brush substrate 40 and the like.

The yoke 24 is formed by drawing a metal plate made of a magnetic material into a cylindrical shape with a bottom, and its opening end is fixed to the pump housing 16.

On the other hand, as shown in FIG. 3, the bottom part 26 of the yoke 24 has a substantially conical shape, and as shown in FIG. A through hole 28 is formed. Near the through hole 28, a pair of left and right through holes 30 and 32 are formed as insertion portions. Further, near the radially outer end of the bottom portion 26,
A portion of the substantially conical bottom portion 26 is bent into a planar shape to form three planar portions 34 .

As shown in FIG. 6, each planar portion 34 is formed with a convex portion 36 that projects inward of the yoke 24. As shown in FIG. The brush substrate 40 is fixed by these protrusions 36.

As shown in FIGS. 2(A) to 2(C), the brush board 40 includes an insulator 41, a negative wiring plate 50 which is a first wiring plate, and a positive wiring plate 52 which is a second wiring plate. It has a thin plate shape, and a through hole 42 corresponding to the through hole 28 of the yoke 24 is formed in the center.

On one side (front side) of the insulator 41, four-pole brushes 44A, 44B, and 44C144D are arranged radially at equal intervals in the circumferential direction, and each claw part 46 is attached to the insulator 41.
1 and is fixed by being caulked. The tip portions of these brushes 44A, 44B, 44C144D each protrude inward in the radial direction from the periphery of the through hole 42. Further, each brush has a bottle-shaped pin tail 48 bent at a substantially right angle and extends from the side wall portion thereof.

On the other hand, the other side of the insulator 41 (the side opposite to each brush)
Wiring plates 50 and 52 made of thin plate material are fixed to the back side). As shown in detail in FIG. 2(C), the wiring plate 50 has a substantially ring shape, and is integrally fixed to the insulator 41 by having a plurality of claws 54 penetrate the insulator 41 and then caulking. A part of this wiring plate 50 is exposed on the front side (each brush side) without being shielded by the brush board 40 at connection parts 56 and 58.
The pigtail 48 of the brush 44B on the negative electrode side is welded and connected to the connecting portion 56, and the pintail 48 of the brush 44D on the negative electrode side is welded and connected to the connecting portion 58. That is, the insulator 4 is formed into a ring shape.
The negative side wiring plate 50 disposed on the periphery of the yoke 24 is connected to the negative side brush 44B and the negative side brush 44D on each of the negative side brushes 44B and 44D on approximately the same plane, and is connected to the convex portion 36 protruding from each flat portion 34 of the yoke 24. It has an electrical connection by being fixed and is body grounded.

Further, from a part of the wiring plate 50 near the brush 44D, an electrode terminal 60 is bent at a substantially right angle toward the front side of the insulator 41 and extends through the insulator 41.
are integrally formed.

The electrode terminal 6G corresponds to one of the through holes 30 of the yoke 24, and is disposed so as to protrude outward after being inserted through the through hole 30. Furthermore, a through hole 6 is provided near the periphery of the wiring plate 50.
2 are drilled in three locations at equal intervals. These through holes 6
2 corresponds to the convex portion 36 formed on the yoke 26,
The convex portions 36 can be fitted into each of them.

On the other hand, the wiring plate 52 has a substantially semicircular arc shape and is located inside the wiring plate 50 in the radial direction, and is short-circuited with the negative wiring plate 50 by being caulked after the plurality of claws 64 penetrate the insulator 41. It is integrally fixed to the insulator 41 without any problem. That is, the negative wiring plate 50 and the positive wiring plate 52 are integrally fixed on substantially the same surface on the other side of the insulator 41, and have a thin plate shape as a whole.

A part of this wiring plate 52 is a connection part 66 that is not shielded by the brush board 40 and is exposed on the front side (each brush side).
．． 68, the pigtail 48 of the brush 44A on the positive electrode side is welded and connected to the connecting portion 66, and the connecting portion 68
The pigtail 48 of the brush 44C on the positive electrode side is welded and connected to. That is, the positive wiring plate 52 is connected to each of the positive brush 44A and the positive brush 44C on substantially the same plane.

Further, from the tip of the wiring plate 52 near the brush 44A, an electrode terminal 7 is bent at a substantially right angle toward the front side of the insulator 41 and extends through the insulator 41.
0 is integrally formed. The electrode terminal 70 is connected to the yoke 2
It corresponds to the other through hole 32 of No. 4, and is arranged so as to protrude outward after being inserted through the through hole 32.

Insulating members 72 are fitted into the pair of left and right through holes 30 and 32 of the yoke 24, respectively. The insulating member 72 is made of synthetic resin, and is formed into a substantially cylindrical shape with an outer diameter corresponding to the through hole 30, 32, as shown in FIGS. 7(A) to 7(C), and as shown in FIG. As shown in FIG. 2, the yoke 24 is fitted into each through hole from the outside and fixed. A fitting groove 74 is formed along the axis in the center of the insulating member 72, and the aforementioned electrode terminals 60 and 70 are respectively fitted into this fitting groove 74. That is, the yoke 24 and the electrode terminal 60.70
In this configuration, an insulating member 72 is interposed between the two. Therefore, the electrode terminals 60, 70 and the yoke 24 are electrically insulated (
(non-short circuit) state. Furthermore, a communication portion 76 that communicates with the insertion groove 74 is formed in the side wall portion of the insulating member 72 .

Therefore, the electrode terminal 60.7 inserted into the insertion groove 74
0 are exposed to the outside via the communication portions 76, respectively.

Next, the operation of this embodiment will be explained together with the procedure for assembling the motor IO.

In the motor 10 having the above configuration, the brushes 44A, 44B, 4
4C, 44D are the connection part 56.58 and the connection part 66.6
8 is a wiring plate 50 or a wiring plate 52, respectively.
Since it is directly connected to the holder, only 4 connections (welding) are required.

After forming the brush substrate 40 in which the wiring plate 50 and the wiring plate 52 are integrally fixed to the insulator 41, the brush substrate 40 is fixed to the yoke 24 in advance. That is, the electrode terminals 60 of the wiring plate 50 and the electrode terminals 70 of the wiring plate 52 are respectively fitted into the insertion grooves 74 of the insulating member 72, and the yoke 24 is inserted into the plurality of through holes 62 formed in the wiring plate 50. The convex portion 36 is inserted.

Further, by caulking the tip of the convex portion 36, the brush substrate 40 to which the wiring plate 50 and the wiring plate 52 are integrally fixed is fixed to the yoke 24 (as shown in FIG. 3). In this case, the protrusion 36 may be fitted into the through hole 62 and then fixed by adhesive.

Next, the armature 12 (armature shaft 14) supported by the pump housing 16 in a cantilever manner is attached to the yoke 24.
Then, the open end of the yoke 24 is attached and fixed to the pump housing 16.

Further, the lead wires 78 are inserted into the communicating portions 76 of each insulating member 72 and welded to the exposed electrode terminals 60, 70, respectively, thereby completing the assembly of the motor 10. When welding the electrode terminals 60.70, each electrode terminal 60.7
0 is exposed to the outside from the communicating portion 76, so it can be connected simply by welding the lead wire 78, and since only two connections are required, workability is also good.

In the electric pump motor 10 assembled in this way,
Electricity is supplied to the four-pole brushes 44A, 44B, 44C, and 44D via the wiring plates 50.52 on the negative and positive sides.

Here, each wiring plate 50, 52 is made of a thin plate material and is integrally fixed to the insulator 41, and is connected to each brush on substantially the same plane, so that the brush board 50.
0 is a thin dimension shape (thin wall shape) as a whole in the motor axis direction. Therefore, the total length of the motor 10 can be shortened.

Moreover, each brush 44A, 44B, 44C of 4 poles.

44D is directly connected to the wiring plate 50.52, and the wiring plate 50.52 is connected to the electrode terminals 60, 70.
Since it is configured to be connected to the lead wire 78 via the lead wire 78, it is sufficient to perform connection (welding) work at six locations in total. Therefore, the number of connection points is reduced compared to the conventional one, and therefore the assembly work efficiency is improved.

Further, in the motor 10, the through hole 62 of the brush substrate 40 (negative electrode side wiring plate 50) is simply engaged with the convex portion 36 of the yoke 24, and the yoke 24 is fixed to the yoke 24.
4, the body can be easily grounded, and the ease of assembly is improved.

Further, in the motor IO, the electrode terminals 60.70 integrally formed on the wiring plate 50.52 are connected to the through holes 30.32.
Since the motor 10 is directly pulled out of the yoke 24 through the insulating member 72 fitted to the
The total length of can be shortened. In addition, the number of connection points is reduced compared to the conventional method, and assembly work efficiency is improved.

In addition, in the above embodiment, the motor 1 for the electric pump
0, the present invention is not limited thereto, and can be applied to any motor in which a plurality of brushes are held on a brush board fixed to the inner bottom of the motor outer frame (yoke).

[Effects of the Invention] As explained above, the motor according to the present invention has the excellent effects of being able to shorten the overall length and improving ease of assembly.

[Brief explanation of drawings]

FIG. 1 is an overall sectional view of the motor according to the present invention, and FIG. 2 (A
) is a front view of the brush board, FIG. 2(B) is a side view of the brush board, FIG. 2(C) is a back view of the brush board, and FIG. 3 is a sectional view of the yoke showing the state in which the brush board is attached. Fig. 4 is a back view of the yoke showing the insulating member attached, Fig. 5 is a bottom view of the yoke, Fig. 6 is a partial sectional view of the yoke showing the convex portion, and Fig. 7 (A) is the insulating member. Front view, Figure 7 (
B) is a side view of the insulating member, and FIG. 7(C) is a back view of the insulating member. 10... Motor, 12... Armature (rotor), 14... Armature shaft, 16... Pump housing, 24... Yoke, 30. 32... Through hole (insertion part), 36 ...Convex portion, 40 ・ ・ 41 ・ ・ 4A1 48 ・ ・ 50 ・ ・ 52 ・ 56.5 60 ・ ・ 62 ・ 66.6 70 ・ ・ 72 ・ ・ Brush board, insulator, 4B, 44C, 44D・・・・・Brush, big technobe wiring plate, wiring plate, ・・connection part, electrode terminal, through hole, ・・connection part, electrode terminal, insulating material.

Claims (3)

[Claims] (1) A motor in which a plurality of brushes are held on a brush substrate fixed to the inner bottom of a yoke having a cylindrical shape with a bottom, the motor being made of a thin plate material, integrally fixed to the brush substrate, and the plurality of brushes a first wiring plate to which one of the brushes of one pole is connected; and a second wiring plate made of a thin plate material, integrally fixed to the brush board, and to which the brush of the other pole of the plurality of brushes is connected. A motor comprising: a wiring plate, wherein a motor drive current is supplied to the brush via the first and second wiring plates. (2) A convex portion that engages and holds the brush substrate is integrally formed on the bottom of the yoke, and the convex portion electrically connects the negative wiring plate of the brush substrate to the yoke. 2. The motor according to claim 1, wherein the motor is fixed in place. (3) electrode terminals integrally formed to protrude from the first and second wiring plates, and an insertion portion formed at the bottom of the yoke corresponding to the electrode terminals, into which the electrode terminals are inserted; an insulating member that insulates the electrode terminal and the yoke and supports the electrode terminal in the insertion portion, and constitutes a connector portion that conducts electricity to the first and second wiring plates via the electrode terminal. The motor according to claim (1) or claim (2), characterized in that: