JP3449576B2 - Commutator motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commutator motor.

[0002]

2. Description of the Related Art In recent years, commutator motors have been required to be able to be automatically assembled due to lack of manpower and cost reduction in the market, and the demand for water resistance is increasing year by year.

A first conventional example of a brush holding structure for automatic assembly of a commutator motor will be described with reference to FIG.

In FIG. 6, 101 is a brush box and 101
a is a hole in the brush box, 102 is a brush spring, 103 is a brush, 103a is a hole in the brush, 104 is a brush holder, 1
Reference numeral 05 is a commutator, and 106 is a temporary fastening needle.

At the time of assembling these, as shown in FIG. 6, the brush 103 and the brush spring 102 are attached to the brush box 1.
01, push the brush 103 into the brush box 101 against the force of the brush spring 102, align the hole 101a of the brush box with the hole 103a of the brush, and temporarily fix them through the temporary fixing needle 106, In this state, the brush holder 104 is installed in the commutator motor, the temporary holding needle 106 is removed, and the brush 103 is replaced with the commutator 105.
Is in contact with.

As a second conventional example disclosed in Japanese Patent Laid-Open No. 60-35794, a pigtail provided on a brush is locked to a projection or a recess for temporary locking so that the brush does not contact the commutator. A method is known in which the pigtail is disengaged from the convex portion or the concave portion for temporary locking after mounting on the armature.

No. 3 disclosed in Japanese Patent Laid-Open No. 5-49205
A conventional example will be described with reference to FIG.

In FIG. 7, 201 is a brush box and 202
Is a brush spring, 203 is a brush, 204 is an amateur,
Reference numeral 205 is a commutator, and 206 is a temporary brush stopper.

Then, the brush temporary fixing stopper 20.
6 is a brush box 201 and a brush 203 and a brush spring 20.
When 2 and is incorporated, the force of the brush spring 202 temporarily stops the brush 203 from protruding from the brush box 201,
When the commutator 205 is inserted, the commutator 205 hits and is broken.

When assembling these, a brush 203 and a brush spring 202 are attached to a brush box 201 in FIG.
Insert and include. At this point in time, the temporary brush fixing stopper 206 suppresses and temporarily holds the brush 203 that is about to project due to the force of the brush spring 202.

In this state, when the commutator 205 is inserted between the brush boxes 201, 201 in which the brush 203 is temporarily fixed by the temporary brush fixing stopper 206, the commutator 205 is fixed by the temporary brush fixing stopper 206, 206
At the time of contact, the brush temporary stoppers 206, 20
6 is broken off, and the brush 20 is attached to the inserted commutator 205.
3, 203 contact.

[0012]

However, the above-mentioned first,
In the second and third conventional examples, after the brush is attached, the temporary holding needle is pulled out, the temporary holding of the convex portion or the concave portion for temporary locking is released, and the broken brush temporary holding stopper is taken out. And the need for space, it is difficult to automatically perform these tasks, and in the case of a water resistant structure for the commutator motor, in the conventional example, the above-mentioned operations are performed after the brush section is attached. It is necessary, and there is a problem in that it is necessary to perform water resistance treatment again in a process different from the step of attaching the brush part.

It is an object of the present invention to solve the above problems and to provide a commutator motor which can be easily assembled automatically.

[0014]

In order to solve the above problems, a commutator motor according to the present invention has a rotor having a commutator and a winding portion, and a stator facing the winding portion of the rotor. A bracket provided with a magnet, a brush that slides on the commutator, a brush box that inserts the brush and a brush spring and presses the brush biased by the brush spring onto the commutator, and the brush box. In a commutator motor comprising a brush box retainer which is held and assembled in the opening of the bracket, a pigtail is provided on a side surface of the brush, and the brush is locked by locking the pigtail. A pigtail locking protrusion that locks at a position slightly protruding from the brush sliding position is provided on the brush box, and the brush box holder and the bracket are connected to each other.
It is characterized in that a sealing material is interposed on the mating surface .

In the commutator motor of the present invention, in order to solve the above-mentioned problems, the brush box holder can hold two brush boxes within one brush box holder at a predetermined angle. It is suitable.

In order to solve the above-mentioned problems, the commutator motor of the present invention has a fitting portion for correctly positioning the brush at the sliding position on the commutator simply by fitting the brush box holder to the bracket. Is preferably provided at the joint between the brush box cage and the bracket, and the fitting portion is a linear insertion type fitting portion for positioning the brush toward the center of the commutator, and the brush. It is desirable that it is composed of a semicircular fitting portion that positions the distance between the box and the commutator.

[0017]

[0018]

In the commutator motor of the present invention, a pigtail is provided on the side surface of the brush, and the brush is slightly protruded from the normal brush sliding position in the brush box in which the brush and the brush spring are inserted. A pigtail locking projection is provided that locks the pigtail in position. The pigtail and the pigtail locking projection do not contact each other after the commutator motor assembly is completed, and the pigtail locking projection itself becomes unnecessary. The stop projection facilitates the work of all processes from the work of inserting the brush and the brush spring into the brush box to the completion of the brush installation. That is, when the brush and the brush spring are inserted into the brush box, the pigtail provided on the side surface of the brush is locked by the pigtail locking projection, and the brush is moved from the brush box to a regular brush slide. It will be in a locked state at a position that protrudes slightly beyond the moving position. The brush box in this state can be easily attached to the brush box holder. Then, even when the brush box retainer with the brush box attached is assembled to the opening of the bracket, the brush box retainer is attached to the opening of the bracket while pressing the tip of the brush onto the commutator. If assembled, the tip of the brush can be positioned while retreating to the regular sliding position in almost one operation, and it is a simple operation that no other work is required. This simple operation of almost one operation can be easily automated. And the present invention is a brush box holding
A sealing material is placed on the joint surface between the container and the bracket.
Therefore, the process of attaching the brush and the water-resistant process can be performed simultaneously.
Can be done

Further, in the commutator motor of the present invention, if the brush box holder is configured to hold the two brush boxes at a predetermined angle, the assembling operation of the single brush can be completed.

Further, in the commutator motor of the present invention, the brush box retainer and the bracket are provided with a fitting portion for correctly positioning the brush at the sliding position on the commutator only by fitting the brush box retainer to the bracket. If it is provided at the joint portion with, the positioning work when assembling the brush box holder to the opening portion of the bracket becomes easy. Further, a linear insertion type fitting part for positioning the fitting part with the brush facing the center of the commutator, and a semi-circular fitting part for positioning the distance between the brush box and the commutator. Then, the work is easier and the reliability is improved.

[0021]

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a commutator motor and its assembling method according to the present invention will be described with reference to FIGS.

The rotor 9 of the rotating portion of the commutator motor has a commutator 8 and a winding portion 9a composed of a plurality of coils. The rotor 9 is rotatably supported by bearings 10 and 10. There is. Reference numeral 11 denotes a metal first bracket, which is an annular magnet 12 facing one surface of the winding portion 9a of the rotor 9.
Is equipped with.

Reference numeral 7 denotes a brush box holder made of synthetic resin, which itself serves as an insulator. A pair of metal brush boxes 16 are attached to the brush box holder 7 by metal brush box fixing legs 17, and the metal brush box fixing legs 17 are electrically connected to the power supply lead wires 18. ing. Then, as shown in FIGS. 2 and 5, the power supply lead wire 18 has the power supply lead wire retainer 23 and the power supply lead wire 18
A portion where the power supply lead wire 18 is fixed to the brush box holder 7 by inserting the power supply lead wire 18 into the power supply lead wire fixing holes 22 and 22 and the power supply lead wire 18 is electrically connected to the metal brush box fixing leg 17. Further, reliability is ensured by preventing tension from acting on the power supply lead wire 18.
In this case, if the power lead wire fixing hole 22 is provided with the taper portion 22a, the folded portion 23a of the power lead wire retainer 23 can be inserted up to the taper portion 22a and temporarily fixed, and the commutator motor is automatically assembled. In the above, the folded portion 23a of the power lead wire retainer 23 is replaced with the tapered portion 22a.
The automatic assembling method in which the wire retainer 23 is inserted, temporarily fixed, and then the wire retainer 23 is pushed in is possible, which improves productivity and reduces cost.

The brush 13 is placed in the brush box 16.
And the brush spring 15 are inserted, but the brush 13
A pigtail 14 is attached to the side surface of the brush box 16, and the brush box 16 has a pigtail window 16 for moving the pigtail 14 out and moving it in the length direction of the brush box 16.
b and the pigtail welding portion 16a for welding the tip of the pigtail 14 protruding outside and the tip of the brush projecting side at the tip of the brush protruding side, the brush which tries to project by the bias of the brush spring 15 by locking the pigtail 14 A pigtail locking projection 24 for temporarily fixing 13 to the end of assembly and a brush box fixing leg 17 for fixing the brush box 16 to the brush box holder 7 are provided.

Therefore, when the brush 13 and the brush spring 15 are inserted into the brush box 16, the brush 1
The pigtail 14 attached to the side surface of the brush box 3 has a pigtail locking projection 24 on the tip side of the brush box 16.
, The brush 13 in the front portion of the portion where the pigtail 14 is attached protrudes from the brush box 16, and the brush 13 in the rear portion of the portion where the pigtail 14 is attached is the brush box 16
It will be left in the inside. In this case, the pigtail 14
Since the thin copper wire is bundled by knitting or the like and is flexible, even if the tip of the pigtail 14 is welded to the pigtail welding portion 16a, within a range in which the length of the pigtail 14 has a margin, the brush 13 can move in the brush box 16 while being biased by the brush spring 15. In this state, the brush box 16 in which the brush 13 and the brush spring 15 are inserted is attached to the brush box holder 7 by the brush box fixing legs 17.

Since the present embodiment relates to a 6-pole electric motor, as shown in FIG. 1, the brush box holder 7 is attached to the brush box holder 7 with two brush boxes 16 at an interval of 60 °.
The front halves of 3 and 13 are protruding.

Reference numeral 1 denotes a metal second bracket, which is an annular magnet 19 facing the other surface of the winding portion 9a of the rotor 9.
In addition, the brush box holder 7 is assembled in the opening 3, and the brush 13 is brought into contact with the commutator 8.

In this embodiment, in order to facilitate the positioning when the brush box holder 7 is assembled in the opening 3 of the second bracket 1, a portion around the opening 3 is shown in FIG. The brush retainer is provided with a positioning protrusion 2 that correctly positions the brushes 13 and 13 toward the center of the commutator 8, and an arcuate positioning protrusion 4 that positions the distance between the brush box 16 and the commutator 8. As shown in FIG. 4, a linear insertion type positioning hole 20 for correctly positioning the brushes 13 and 13 shown in FIG. An arcuate positioning recess 21 for positioning the brush box 16 and the commutator 8 by fitting the arcuate positioning projection 4 is provided.

Then, by fitting these positioning means as described above, the brush 13 as described above is provided.
Is correctly positioned toward the center of the commutator 8, and at the same time, the distance between the brush box 16 and the commutator 8 is correctly positioned so that the screw holes 5 and 5 of the second bracket 1 can be positioned.
In addition, the screw insertion holes 5a, 5a of the brush box holder 7 can be accurately aligned and screwed. Then, a seal material 6 shown in phantom in FIG. 1 is interposed on the joint surface between the brush box cage 7 and the opening 3, and the seal material 6 has a semi-kneaded gasket, for example, When a urethane-based sealing material is used, the urethane-based sealing material has elasticity and a thick film is hardened by moisture, so that excellent dustproof performance, water resistance performance, and airtight performance can be obtained. Incidentally, as described above, the brush box holder 7 is operated by the positioning means.
Can be correctly positioned on the second bracket 1 without laterally shifting and correcting the position.
It does not make the other parts dirty by over-protruding.

[0031]

According to the commutator motor of the present invention, the brush box retainer can be easily assembled and the brush is attached.
That step a water treatment process and can be performed simultaneously Rutotomoni, since the post-processing work on releasing the brush tacked was required in the prior art is not required, suitable for automated assembly, the improvement of productivity and reliability Can be achieved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional plan view showing a brush box holder of an embodiment of a commutator motor of the present invention.

FIG. 2 is a sectional view of an example of a commutator motor of the present invention.

FIG. 3 is a front view and a side view of the brush box of the embodiment of the commutator motor of the present invention.

FIG. 4 is a perspective view of the positioning means of the brush box holder of the embodiment of the commutator motor of the present invention.

FIG. 5 is a partial cross-sectional side view of the power supply lead wire retainer and the power supply lead wire fixing hole of the embodiment of the commutator motor of the present invention.

FIG. 6 is a diagram showing a brush holder of a conventional commutator motor.

FIG. 7 is a diagram showing a brush attachment mechanism of another conventional commutator motor.

[Explanation of symbols]

1 second bracket 2 Positioning protrusion 3 openings 4 Circular positioning protrusion 5 screw holes 5a screw insertion hole 6 sealing material 7 Brush box holder 8 commutator 9 rotor 9a Winding part 10 bearings 11 First bracket 12 ring magnet 13 brushes 14 pigtails 15 brush spring 16 brush boxes 16a Pigtail welding part 16b pigtail window 17 Brush box fixed leg 18 power supply lead wire 19 ring magnet 20 Positioning hole 21 Arc-shaped positioning recess 22 Power lead fixing hole 23 Power lead wire holder 24 Pigtail locking protrusion

Continuation of the front page (56) References Showa 58-145062 (JP, U) Showa flat 5-39156 (JP, U) Showa flat 3-7638 (JP, U) Showa flat 4-25451 (JP , U) Actual development Sho 63-179756 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 5/14 H02K 13/00

Claims (4)

(57) [Claims] 1. A rotor having a commutator and a winding portion, a bracket having a stator magnet facing the winding portion of the rotor, a brush sliding on the commutator, and the brush. Rectification comprising: a brush box into which a brush spring is inserted to press the brush urged by the brush spring onto the commutator; and a brush box retainer that holds the brush box and is installed in the opening of the bracket. In the slave electric motor, a pigtail is provided on a side surface of the brush, and a pigtail locking protrusion that locks the brush at a position slightly protruding from a regular brush sliding position by locking the pigtail is provided on the brush box. Provide the above
Apply sealant to the joint surface between the box holder and the bracket.
A commutator motor characterized by being interposed . 2. The commutator motor according to claim 1, wherein the brush box holder holds the two brush boxes at a predetermined angle. 3. A fitting portion for correctly positioning the brush at a sliding position on the commutator by simply fitting the brush box cage to the bracket is provided at a joint portion between the brush box cage and the bracket. The commutator motor according to claim 1. 4. The fitting part includes a straight insertion type fitting part for positioning the brush toward the center of the commutator, and an arc-shaped fitting part for positioning the distance between the brush box and the commutator. The commutator motor according to claim 3, wherein