JPH011442A - Carbon brush retainer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a carbon brush retainer, and particularly to improving the workability of equipment having a commutator, such as a commutator type motor.

[Conventional technology]

Conventionally, a device for temporarily storing carbon brushes in a brush holder during transportation and handling was developed by the Special Publication Corporation in 1983.
As described in Japanese Patent No. 35794, a pigtail with one end fixed to a carbon brush is locked to a locking protrusion or recess provided nearby, and when the carbon brush is temporarily stored in a brush holder. It had become. However, it is difficult to handle flexible pigtails,
The work of locking the pigtail and the work of removing the pigtail when releasing the lock must be done manually, and no consideration has been given to workability.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology does not give consideration to workability when temporarily storing the carbon brush in the brush holder and when releasing the storage, and there is a problem in that workability deteriorates.

An object of the present invention is to provide a carbon brush holder with the work of locking and locking the carbon brush in order to temporarily store the carbon brush in the brush holder, against a brush spring that biases the carbon brush. The objective is to improve the workability of the release work.

[Means for solving problems]

The above object is to provide a carbon brush with a convex portion or a concave portion and a brush holder facing the convex portion with a hole, to penetrate through the hole and engage the convex portion or concave portion.

A carbon brush lock that has a locking piece that elastically bends only in the storage direction of the carbon brush when it comes into contact with the carbon brush sliding inside the brush holder, and that presses the locking piece toward the inside of the brush holder. This can be achieved by attaching the body to the brush holder.

[Effect]

When the carbon brush is pushed into the brush holder against the brush spring and stored, the carbon brush hits the locking piece that protrudes inside the brush holder, but the locking piece bends in the direction in which the carbon brush is stored. is stored. At this time, the locking piece returns to its original shape due to its elasticity and engages or fits with the protrusion or four parts of the carbon brush. At this time, since the locking piece did not bend in the direction of the biasing force of the brush spring, the carbon brush was temporarily locked. It is stored in the brush holder.

Further, the locking can be released simply by moving the locking piece in the removal direction.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is used for vacuum cleaners, etc. It is a longitudinal cross-sectional view of an example applied to an electric blower.

The electric motor 1 is composed of a housing 3 and an end bracket 4, and a blower section 2 is constructed on the end bracket 4 side. The airflow discharged from the blower section 2 flows into the motor section 1 through the window 4' of the end bracket 4, cools the motor section 1, and then flows out through the housing window 3'.

The electric motor section 1 includes an end bracket 4 and a housing 3.
A rotor 6. having a commutator 9 is supported by two bearings 10, 10' held in the rotor 6. A carbon brush 20 that rotates and slides in contact with the stator 7 and commutator 9 that are press-fitted into the housing 3 and a carbon brush holder 40 that holds them.
It is made up of.

2 and 3 show the carbon brush 20 and carbon brush holder 40. FIG. Brush holder 24 is fixed to insulator 25. When this is fixed, the hole 24a of the brush holder 24.

24a' and the holes 25a, 25a' of the insulator 25 are provided at positions that coincide with each other. brush holder 24
A brush spring 21 for biasing the carbon brush 20 in one direction is inserted inside, and then the carbon brush 20
is inserted. The pigtail 28 of the carbon brush 20 passes through the inner diameter of the brush spring 21, emerges from the rear opening 29 of the insulator 25, and is connected and fixed to the terminal 23 or 23' by welding, soldering, or the like. Terminal 23゜23'
are attached and fixed to protrusions 30° and 30' provided on the insulator 25, respectively. The carbon brush locking body 26 is a locking piece 27.27 that is integrally molded from resin or the like and has elasticity.
' have. When the carbon brush locking body 26 is attached to the insulator 25, the locking pieces 27 and 27' fit into the holes 25a of the insulator 25.

25a' and the hole 24a of the brush holder 24.

24a' and protrudes into the interior of the brush holder 24.

At this time, since the carbon brush locking body 26 is attached so as to sandwich the insulator 25, the locking pieces 27 and 27' are biased toward the inside of the brush holder 24.

The carbon brush 20 is provided with protrusions 20a and 20a' on the sliding surface with the brush holder 24, and as shown in FIG. 4, which shows the carbon brush holder 40 after being assembled, the brush holder 24 is 20a.

Since a relief portion 24' is provided on the opposing surface of 20a' so as not to come into contact with the carbon brush 20, the carbon brush 20 can be inserted therein.

5 to 8 sequentially show the state in which the carbon brush 20 is temporarily locked in the brush holder 24 until it is released from the lock. In FIG. 5, in the assembled carbon brush retainer 40, the carbon brush retaining body 2
The locking pieces 27, 27' of 6 are connected to the holes 25a, 25 of the insulator 25.
a' and holes 24a, 24a' of the brush holder 24
It penetrates through and projects into the space of the relief part 24'. Therefore, if you push the carbon brush 20 in the direction of the arrow in Figure 1,
As shown in FIG. 6, the protrusions 20a and 20a' provided on the carbon brush 20 abut against the locking pieces 27.27', but the elastic locking pieces 27.27' When the convex portions 20a and 20a' have overcome the bending, the seventh
It returns to the original state as shown in the figure. At this time, carbon brush 2
0, the carbon brush 20 receives the biasing force of the brush spring 21 in the direction of the arrow in FIG. The locking piece 27.27
The carbon brush 20 can be locked in the brush holder 24 against the bias of the brush spring 21 by the engagement of the protrusions 20a and 20a'. Next, regarding the release of the above locking, as shown in FIG.
．． By pushing 33' in the direction of the arrow in the figure, the insulator 25
The locking pieces 27, 27' move as shown in the figure using the fulcrum portions 34, 34' provided at the fulcrums 34, 34' as fulcrums to release the locking described above. At this time, since the locking pieces 27 and 27' are integrally formed with the carbon brush locking body 26, there is no problem of them being lost or getting into the motor section 1.

As described above, the carbon brush 20 is attached to the brush holder 2.
The process of temporarily locking and storing the carbon brush 20 in the carbon brush 4 can be done by simply pushing the carbon brush 20 in one direction, and the lock can be released by simply pushing the extension part 33, 33'. Therefore, the work is very simple and can be automated.

In the above example, two locking pieces 27 and 27' are provided, but in reality, the carbon brush 20 can be locked by engaging at one place. 2Qa'
, holes 24a, 24a', 25a.

25a', locking pieces 27, 27' and extension part 33°33
It is only necessary to provide one each of ', and the structure and workability can be further simplified.

Furthermore, if the locking pieces 27 and 27' protrude into the brush holder 24 again after the locking is released, and this may impede the biasing of the brush spring 21, as shown in FIG. It is sufficient to provide a locking portion 36°36' such that when the locking piece 33' is locked, the locking between the locking piece 27, 27' and the convex portions 20a, 20a' is released. For example, the 9th
In the figure, a hook-shaped locking portion 36.36' is provided integrally with the insulator 25, and when the extension portion 33.33' is pushed in the direction of the arrow, the locking by the locking piece 27.27' is released. is,
The carbon brush 20 comes into contact with the commutator 9 due to the bias of the brush spring 21 . At the same time, since the extension portion 33.33' is locked to the locking portions 36, 36', the locking piece 27.27'
However, the problem that the brush spring 21 protrudes again into the inside of the brush holder 24 and prevents the brush spring 21 from being biased does not occur.

The carbon brush 20 can be locked with the locking pieces 27, 27' by the recesses instead of the projections 20a, 20a'. Fig. 10 shows the recesses 20b and 20b'.
An example is shown below. By fitting the locking pieces 27 and 27' into the recesses 20b and 20b' provided in the carbon brush 20, the carbon brush 20 can be locked against the bias of the brush spring 21.

As a result, the carbon brush 20, which is susceptible to damage such as cracking or breakage, can be temporarily locked in the brush holder 24 during transportation or assembly into the electric motor part l as shown in FIG. , damage can be prevented. Also,
During assembly, if the carbon brush 20 biased by the brush spring 21 comes out of the brush holder 24, the carbon brush holder 40 is moved against the brush spring 21 to the motor section 1.
Although it may make workability worse, such as attaching it to
As shown in Figure 1, the carbon brush 20 is attached to the brush holder 24.
When the rotor 6 is installed inside the
The carbon brush 20 can be assembled without hitting the bearing 10.

〔Effect of the invention〕

According to the present invention, the following effects can be obtained.

1. The carbon brush 20 includes locking pieces 27, 27' and convex parts 20a, 20a' or concave parts 20b.

Since the carbon brush holder 40 can be temporarily locked in the brush holder 24 by the carbon brush holder 20b', damage such as cracking or breakage can be prevented when the carbon brush holder 40 is transported or assembled to the motor section 1. can.

2. The work of locking the carbon brush 20 in the brush holder 24 can be done by simply pushing the carbon brush 20 in one direction, and the locking can be released by simply pushing the extensions 33° and 33'. It has very good workability and can be automated.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG.
FIG. 3 is a perspective view showing the assembly of the carbon brush holder 40, FIG. 4 is an external view of the brush holder, FIGS. 5 to 9 are sectional views of the carbon brush holder 40, and FIG. FIG. 11, a plan view including a partial cross section of a carbon brush retainer 40 showing another embodiment, is a longitudinal sectional view showing an assembled state of the electric motor section 1. 20... Carbon brush, 20a, 20a'... Convex portion, 20b, 20b'... Concave portion, 21... Brush spring, 24... Brush holder, 24a, 24a'...
- Hole, 26... Carbon brush locking body, 27, 27'
...In charge also 1 mouth 20.5 force - O, -77 "raso 24... Fratupa ruku 25,... Gekihi - all books I 1 - 40,... Sword - 7↑, ゛ infrastructure 8/I Atsushi Tatsujiki 4
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Claims (1)

[Claims] 1. A carbon brush holder that includes a carbon brush, a brush holder that holds the carbon brush, and a brush spring that is housed in the brush holder and biases the carbon brush. provided with a hole on the surface of the brush holder opposite to the convex portion or the concave portion, and an elastic locking piece that passes through the hole and is biased toward the carbon brush sliding surface,
A carbon brush holder, wherein the locking piece locks the carbon brush only in the biasing direction of the brush spring by engaging with the convex portion or the concave portion.