JPH0446545A - Assembly method for motor and temporarily brush holding structure - Google Patents

Abstract

PURPOSE:To facilitate an assembly operation and to improve an assembly accuracy by holding a brush at the same position as a brush position in a completely assembled state by a jig, and then moving a jig by pressing a yoke and a housing in an approaching direction. CONSTITUTION:Brushes 44A, 44B, 44C, 44D are temporarily held by using jigs 80, 82. Thus, the brushes are temporarily held at the same positions as the brush position in a completely assembled motor state. Then, a yoke 24 is sequentially pressed together with a brush board 40 toward a pump housing 16 while maintaining the coincident axial state of an armature shaft 14 coupled in coincidence with the axis with the jig 82 and the jig 82. Thus, when the jig 82 moves axially in the jig 80 and further the jig 82 is moved to be advanced, a commutator 22 disposed in the same axis as the jig 82 is brought into pressure contact with the brushes instead of the jig 82 to hold it.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for assembling a motor in which one end of the rotating shaft of a rotor is cantilevered by a housing, and a structure for temporarily holding brushes when assembling the motor. Regarding.

[Prior Art] As an electric pump motor for driving a fluid pump that pumps fluid such as oil, a rotating 2. Description of the Related Art There is known an electric pump motor in which one end of a child's rotating shaft is cantilevered by a pump housing.

In this type of electric pump motor, a brush board is disposed corresponding to the other end of the rotating shaft of the rotor, which is supported in a cantilever by the pump housing. This brush substrate holds a four-pole brush.

When assembling an electric pump motor, temporarily attach the brush board to the end of the yoke while touching each brush to the commutator assembled on the rotor, and then attach the end plate together with the brush board to the yoke. After attaching to the end, the yoke was fixed by caulking.

[Problems to be Solved by the Invention] By the way, each brush is naturally in pressure contact with the commutator when the assembly is completed, so in the conventional method of assembling an electric pump motor, each brush is not brought into contact with the commutator. The task of temporarily attaching the brush substrate to the end of the yoke while making contact with it was complicated. Further, the relative position between each brush and the commutator tends to be inaccurate, and the assembly accuracy is also low.

The present invention takes the above-mentioned facts into account, and aims to provide a motor assembly method and a brush temporary holding structure that can be assembled with high precision and improve assembly ease.

[Means for Solving the Problems] A method for assembling a motor according to the invention according to claim (1) is such that one end of a rotating shaft of a rotor is supported in a cantilever manner by a housing, and one end of the rotating shaft of the rotor is supported on a side opposite to the housing. A method for assembling a motor in which a brush that is always energized on an assembled commutator is fixed to a yoke accommodating the rotor and attached to a brush board, the outer diameter of the commutator The brush attached to the brush board is temporarily brought into contact with the outer peripheral surface of a jig formed to have an outer diameter equal to or larger than Then, while maintaining a state in which the axis of rotation of the commutator side of the rotor and the axis of the jig coincide with each other, the jig is pushed into the jig while sequentially pushing the yoke and the housing toward each other. The commutator is moved in the axial direction with respect to the yoke, and the outer periphery of the commutator is brought into pressure contact with the brush instead of the jig to assemble the commutator.

In the motor brush temporary holding structure of the invention according to claim (2), one end of the rotating shaft of the rotor is cantilever-supported by the housing, and the rotating shaft is always attached to a commutator assembled on the opposite side of the housing. A brush temporary holding structure for assembling a motor in which the brush in an energized state is attached to a brush board fixed to a yoke that accommodates the rotor,
The yoke has a cylindrical shape with a bottom, and a through hole is formed in the bottom of the yoke. The brush attached to the brush base plate is temporarily brought into contact with the outer circumferential surface of the jig, and the brush is held at approximately the same position as the brush in the assembled state.

[Function] In the motor assembly method according to claim (1), the brush that is always energized by the commutator is initially held by the jig at approximately the same position as the brush position in the completed assembly state. By simply pushing the yoke and the housing toward each other, the brushes are held in pressure contact with the commutator instead of using a jig, and the brushes are in the assembled state. In this way, the assembly is completed by simply pushing and moving the yoke or housing, which simplifies the assembly work, and also improves the accuracy of assembly as the relative position of the brush and commutator becomes accurate. .

In the motor brush temporary holding structure according to claim (2), the brush substrate is integrally fixed to the yoke, and the brush attached to the brush substrate and always urged in the direction of the commutator is mounted on a jig. The brush is held at approximately the same position as the brush in the assembled state. That is, the yoke, the brush base plate, and the brush are integrally held at approximately the same position as in the assembled state. Therefore, these parts can be transported within the factory in a state where they are separated from the rotor and the housing, and even if they are transported in a separated state, the assembly positions of brushes and the like will not shift.

[Example 1] FIG. 1 shows an overall sectional view of an electric pump motor 10 for a vehicle that is assembled using the motor assembly method according to the present invention. Further, FIG. 2 shows a sectional view of the assembled state of the electric pump motor 10 to which the assembly method and brush temporary holding structure according to the present invention are applied.

In the electric pump motor 10, an armature shaft 14 of an armature (rotor) 12 is supported by a bearing 18 in a pump housing 16.
The end portion of is connected to the pump section 20. A commutator (commutator) 22 is provided at the other end of the armature shaft 14.
are assembled, and brushes 44A, 44B, 44C, and 44D attached to a brush base plate 40, which will be described in detail later, are in contact with each other. The pump housing 16 also includes an armature 12 and brushes 44A, 44B, and 44C.

A yoke 24 is fixed to accommodate the 44D1 brush board 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 portion 26 of the yoke 24 has a substantially conical shape, and as shown in FIG. 6, a through hole 28 is formed in the center. Near the through hole 28, a pair of left and right through holes 30.32 are formed as insertion portions through which electrode terminals 60.70, which will be described later, are inserted. 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. 7, 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. 5(A) to 5(C), the brush board 40 is formed of an insulator 41 and wiring plates 50, 52, and has a thin plate shape, with a yoke 2 in the center.
A through hole 42 corresponding to the through hole 28 of No. 4 is formed. A four-pole brush 4 is provided on one side (front side) of the insulator 41.
4A, 44B.

44C144D are arranged radially at equal intervals in the circumferential direction,
Each of the claw portions 46 is enlarged and fixed to the insulator 41 by caulking. These brushes 44A, 44B, 44C, and 44D are always biased toward the center of the through hole 42, and are in the state before motor assembly (
When simply attached to the insulator 41), each tip of each brush projects radially inward from the periphery of the through hole 42. Further, each brush has a pin-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)
A pair of wiring plates 50 and 52 are fixed to the back side). As shown in detail in FIG. 5(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 a connection part 56, 58 that is exposed on the front side (each brush side) without being shielded by the insulator 41, and the pigtail 48 of the brush 44B is welded and connected to the connection part 56. The connecting portion 58 is connected to the blank 44D.
A pin tail 48 is welded and connected. That is,
The wiring plate 50 is connected to each of the brushes 44B and 44D on substantially the same plane.

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 60 corresponds to one of the through holes 30 of the yoke 24, and is disposed so as to protrude outward from the yoke 24 after being inserted through the through hole 30. Further, near the periphery of the wiring plate 50, three through holes 62 are formed at equal intervals. These through holes 62 correspond to the convex portions 36 formed on the yoke 26, and 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 caulked after the plurality of claws 64 penetrate the insulator 41, thereby preventing short circuits with the wiring plate 50. It is integrally fixed to the insulator 41. That is, the wiring plate 50 and the 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. This wiring plate 5
2 is a connecting portion 66, 68 that is exposed on the front side (each brush side) without being shielded by the insulator 41, and the pigtail 4 of the brush 44A is connected to the connecting portion 66.
8 are welded and connected, and the pigtail 48 of the brush 44C is welded and connected to the connecting portion 68. That is, the wiring plate 52 is connected to each of the brushes 44A and 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
4, and is disposed so as to protrude outward from the yoke 24 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. 8(A) to 8(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, a jig 8 used when assembling the electric pump motor 10
0 and the jig 82 will be explained.

As shown in FIGS. 2 and 9, the jig 80 is formed in a cylindrical shape, and one end is a functional fitting portion 84 formed to correspond to the inner diameter dimension of the through hole 28 of the yoke 24. , can be fitted into the through hole 28 and fixed. Further, the inner diameter of the jig 80 corresponds to the outer diameter of the commutator 22, and is set to be equal to or slightly larger. Furthermore, a pair of protrusions 81 are formed on the outer circumferential surface of the jig 80 to engage with a pair of notches 29 formed in the through hole 28, and the jig 80 vibrates during transportation and rotates relative to the yoke 24. Prevents it from falling off.

On the other hand, the jig 82 is formed in a cylindrical shape, and its outer diameter corresponds to the inner diameter of the jig 80, that is, the outer diameter of the commutator 22. It can be slid.

A recess 86 is formed at one end of the jig 82 so as to coincide with the axis. The distal end of the armature shaft 14 that further protrudes from the commutator 22 can be fitted into the recess 86 .

Next, the operation of this embodiment will be explained together with the assembly procedure of the electric pump motor 10.

In the electric pump motor 10 having the above configuration, the brush 44A,
44B, 44C, and 44D, since the connecting portions 56.58 and 66.68 are directly connected to the wiring plate 50 or the wiring plate 52, respectively, connection (welding) work is sufficient at four locations.

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 fitting 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, as shown in detail in FIG. 2, the jig 80 and the jig 8
2 to temporarily hold the brushes 44A, 44B, 44C144D.

That is, the stepped fitting portion 84 of the jig 80 is fitted into the through hole 28 of the yoke 24 to be temporarily fixed. Further, a jig 82 is inserted into the jig 80, and the brushes 44A, 44B, 44C144D are temporarily held by this jig 82. As a result, the yoke 24, the brush base plate 40, and the brushes 44A, 44B, 44C, and 44D are integrally assembled with each other, and their respective tips are connected to the through holes.
The brushes that have been protruding radially inward from the circumferential edge of the motor 2 are temporarily held at their normal positions, which are the same as the brush positions in the motor assembly completion state.

Next, the armature 12 (armature shaft 14) supported by the pump housing 16 in a cantilever manner is attached to the yoke 24.
insert the tip of the armature shaft 14 into the jig 8.
It fits into the recess 86 of No. 2.

As a result, the armature shaft 14 is connected to the jig 82 with its axis aligned.

Furthermore, the yoke 24 is sequentially pushed into the pump housing 16 together with the brush base plate 40 while maintaining the alignment of the axes of the armature shaft 14 and the jig 82 . As a result, the jig 82 is moved along the axis within the jig 80, and as the jig 82 continues to move, the commutator 22 located on the same axis as the jig 82 replaces the jig 82. It comes into pressure contact with each brush and holds it.

After each brush is brought into pressure contact with the commutator 22 at a proper position, the open end of the yoke 24 is fixed to the pump housing 16. Furthermore, the jig 80 and the jig 8
2 is removed from the yoke 24, and a cover 79 is attached to the through hole 28 of the yoke 24, completing the assembly of the yoke 24 and each brush.

After the yoke 24 is assembled to the pump housing 16, the IJ-wires 78 are inserted into the communication portions 76 of each insulating member 72 and welded to the exposed electrode terminals 60 and 70, respectively.
This completes the assembly of the electric pump motor 10.

As described above, in the electric pump motor 10 and its assembly method, the through hole 62 of the brush board 40 (wiring plate 50)
The brush base plate 40 is fixed to the yoke 24 by simply engaging it with the protrusion 36 of the yoke 24, and is integrated with the yoke 24.
Each brush attached to the assembly is held by a jig 82 at the same position as the brush in the assembled state. That is, the yoke 24, the brush base plate 40, and each brush are integrally held in the same position as in the assembled state. Therefore, these parts can be carried separately from the armature 12 (armature shaft 14) and the pump housing 16, and even if they are carried separately, the assembly position of the brush etc. will not shift.

Further, each brush, which was initially held in the same position as in the assembled state by the jig 80 and the jig 82, is sequentially held in pressure contact with the commutator 22 instead of the jig 82 by simply pushing the yoke 24, and is then assembled. state. Therefore, since the assembly is completed by simply pushing and moving the yoke 24, the assembly work is facilitated, and the relative position between each brush and the commutator 22 is also accurate, improving the accuracy of assembly.

In this embodiment, a case has been described in which the jig 80 and the jig 82 are assembled separately, but the jig 80 and the jig 82 may be formed integrally. It may also be a configuration. Further, if the inner diameter of the through hole 28 of the yoke 24 is the same as the outer diameter of the commutator 22, the jig 80 does not need to be used. Even in these cases, each brush can be assembled with the yoke 24 easily and accurately.

Furthermore, although the above embodiment describes a motor for an electric pump, the present invention is not limited to this, and can be applied to any motor in which a commutator and brushes are arranged on the bottom side of a bottomed cylindrical yoke. .

[Effects of the Invention] As explained above, the motor assembly method and brush temporary holding structure according to the present invention enable highly accurate assembly of a motor in which a commutator and brushes are arranged on the bottom side of a bottomed cylindrical yoke. It has the excellent effect of being able to be assembled easily and improving ease of assembly.

[Brief explanation of the drawing]

FIG. 1 is an overall sectional view of an electric pump motor to which the motor assembly method and brush temporary holding structure according to the present invention are applied;
Figure 2 is a sectional view showing how the electric pump motor is assembled, Figure 3 is a sectional view of the yoke showing how the brush board is installed, and Figure 4 is the back side of the yoke showing the insulating member installed. 5(A) is a front view of the brush board, FIG. 5(A) is a front view of the brush board, and FIG.
B) is a side view of the brush substrate, FIG. 5(C) is a back view of the brush substrate, FIG. 6 is a bottom view of the yoke, FIG. ) is a front view of the insulating member, FIG. 8(B) is a side view of the insulating member, FIG. 8(C) is a back view of the insulating member, and FIG. 9 is a perspective view of the jig. DESCRIPTION OF SYMBOLS 10... Electric pump motor, 12... Armature (rotor), 14... Armature shaft, 16... Pump housing, 22... Commutator, 24... Yoke, 28... Through hole , 36... Convex portion, 40... Brush substrate, 41... Insulator, 44A, 44B, 44C, 44D... Brush, 50
．． 52... Wiring plate, 80... Jig, 82... Jig, 84... Functional insertion part, 86... Recessed part. Fig. 2 T skewer lever f'7 motor feeder 7-ma + palm 7 foot f'//pressure key, mitator yoke hole 368 hole 407 run base holder 44A, 44 B Frage 80 Numayo 825 Yu 84 J9 A size f enters β 86 concave

Claims (2)

[Claims] (1) One end of the rotating shaft of the rotor is cantilever-supported by the housing, and a brush that is always energized by a commutator assembled on the opposite side of the rotating shaft from the housing accommodates the rotor. A method for assembling a motor attached to a brush substrate fixed to a yoke, the motor being attached to the brush substrate on the outer peripheral surface of a jig formed to have an outer diameter equal to or larger than the outer diameter of the commutator. temporarily bring the brushes into contact with each other and hold the brushes at substantially the same position as the brushes in the assembled state, and then align the commutator-side rotation axis of the rotor with the axis of the jig. moving the jig in the axial direction with respect to the yoke while sequentially pushing the yoke and the housing toward each other while maintaining the state of A method for assembling a motor, characterized in that the motor is brought into an assembled state by being brought into pressure contact with a brush. (2) One end of the rotating shaft of the rotor is cantilever-supported by the housing, and a brush that is always energized by a commutator assembled on the opposite side of the rotating shaft from the housing accommodates the rotor. A temporary brush holding structure for assembling a motor attached to a brush board fixed to a yoke, the yoke having a cylindrical shape with a bottom, and a through hole formed in the bottom of the yoke, The brush attached to the brush substrate is temporarily brought into contact with the outer peripheral surface of a jig that is assembled into the through hole and formed to have an outer diameter equal to or larger than the outer diameter of the commutator. A temporary brush holding structure for a motor, characterized in that the brush is held at substantially the same position as the brush position in a completed state.