JPH0629378U - Brush mounting structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a brush mounting structure capable of inspecting the amount of wear without taking out a brush from a rotating machine such as a DC motor, and easily inspecting anyone in a short time. [Structure] A brush 3 in contact with a commutator 20, a brush mounting terminal 13 for biasing the brush 3 toward the commutator 20 via a spring 11, and a brush cap for housing the brush mounting terminal 13 in a housing 40. In the brush mounting structure including 9, the brush cap 9 and the brush mounting terminal 13 are provided.
The wear amount of the brush 3 is inspected from the reduction amount in appearance of the portion where the check rod 7 projects from the housing 40 by being provided with insertion holes 9a and 13a through which the check rod is inserted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a brush mounting structure used in a rotating machine, and more particularly to a brush mounting structure capable of inspecting a brush wear amount.

[0002]

[Prior art]

 As is well known, as shown in FIGS. 4 and 5, the DC motor 101 includes a commutator 120 and an armature 130 centering on the rotating shaft 110, and these are housed in a housing 140. Further, the commutator 120 is provided with a brush 103 for passing a current. In order to attach the brush 103, the DC motor 101 is provided with a brush insertion hole 105 provided in the housing 140 into which the brush 103 is inserted, a male screw-shaped brush cap 107 serving as a lid of the brush insertion hole 105, and the brush 103 being worn. Accordingly, a spring 109 for urging the brush 103 toward the commutator 120 and a dish-shaped brush mounting terminal 111 provided with a guide claw 111a extending toward the commutator 120 to support the spring 109, and the brush 103. And a brush holder 113 for holding

The brush 103 is worn because it contacts the rotating commutator 120. Therefore, the brush 103 must be replaced according to the amount of wear of the brush 103, and the amount of wear of the brush 103 must be regularly inspected.

Conventionally, in order to inspect the wear amount of the brush 103, the brush cap 107 is removed from the housing 140, the brush attachment terminal 111 and the spring 109 inserted in the brush insertion hole 105 are taken out, and then the brush is attached. It is performed by pulling 103 out of the brush insertion hole 105 and actually measuring the length with a ruler or the like.

[0005]

However, in the conventional brush mounting structure, the brush 103 has to be pulled out from the brush insertion hole 105, so that there is a problem that the inspection takes time. In particular, when one DC motor 101 has a plurality of brushes, it takes more work. Further, when the DC motor 101 is installed inside the machine, it is very difficult to remove the brush 103 from the brush insertion hole 105. In some cases, the DC motor 101 may be removed from the machine body. There must be.

The present invention has been made in view of the above circumstances, and an object thereof is to inspect the amount of wear without taking out a brush from a rotating machine such as a DC electric motor. Further, anyone can easily and quickly perform the inspection. The purpose is to provide a brush mounting structure that allows the wear amount to be inspected.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a brush that contacts a commutator, a brush mounting terminal that biases the brush toward the commutator through a spring, and a rotating machine that rotates the brush through the brush mounting terminal. A brush mounting structure having a brush cap housed in a housing is characterized in that an inspection hole is formed through the brush cap and the brush mounting terminal, into which a rod for brush wear amount inspection is inserted. There is.

[0008]

[Action]

 According to the above structure, the rod for inspecting the amount of brush wear is inserted into the rotary housing through the inspection hole provided through the brush cap and the brush mounting terminal. In this brush wear amount inspection rod, the portion protruding from the housing becomes shorter in appearance due to the wear of the brush, and thus the wear amount of the brush can be inspected by the reduced amount.

[0009]

【Example】

 1 and 2 show a first embodiment of a brush mounting structure according to the present invention.

As shown in FIGS. 1 and 2, the DC motor 1 is provided with a commutator 20 and an armature 30 around a rotary shaft 10, and these are housed in a housing 40. In addition, the commutator 20 is provided with a brush 3 for passing an electric current. In order to attach the brush 3 with the brush attachment structure according to the present invention, the DC motor 1 includes a brush insertion hole 5 provided in the housing 40, into which the brush 3 is inserted, and a check rod 7 for inspecting the wear amount of the brush 3. A brush cap 9 that serves as a lid for the brush insertion hole 5, a spring 11 that biases the brush 3 toward the commutator 20 in response to wear of the brush 3, and a dish-shaped brush mounting terminal 13 that supports the spring 11. , A brush holder 15 for holding the brush 3, and a pigtail 17.

The brush insertion hole 5 is provided with an internal thread on the inner peripheral surface of the brush insertion hole 5, and a support portion 5 a for supporting the brush mounting terminal 13 is provided at the inner rear end portion of the brush insertion hole 5. (See Figure 2).

At the tip of the check rod 7, there is formed a dish portion 7 a that is slightly larger than the diameter of the spring 11. The dish 3a and the spring 11 urge the brush 3 and the check bar 7 toward the commutator 20 side. Further, the dish portion 7a is provided with an insertion hole (not shown) into which the pigtail 17 for passing a current to the commutator 20 is inserted. Further, the length of the check rod 7 attached to the DC motor 1 is equal to the length (M) of the check rod 7 protruding from the housing 40 and the wear limit length (L) of the brush 3. Length (see Fig. 2).

The brush cap 9 and the brush mounting terminal 13 are provided with insertion holes 9 a and 13 a, respectively, into which the check bars 7 are inserted, and the female screw portion of the brush insertion hole 5 is provided on the outer peripheral portion of the brush cap 9. A male screw corresponding to is formed.

The brush mounting terminal 13 is provided with an insertion hole 13 a into which the check rod 7 is inserted, and a guide claw 13 b extending toward the commutator for supporting the spring 11.

Next, a specific method of attaching the brush 3 and an operation of inspecting the abrasion amount of the brush 3 when the brush attaching structure of this embodiment is applied to the DC motor 1 will be described with reference to FIGS. 1 and 2. .

In order to attach the brush 3 to the DC motor 1, first, the brush 3 is inserted from the brush insertion hole 5 into the brush holder 15 inside the housing 40 until it comes into contact with the rectifier 20. Then, the check rod 7 is inserted into the brush insertion hole 5 from the side of the dish 7a, the tip of the pigtail 15 is inserted into the pigtail insertion hole of the dish 7a, and attached to the side surface of the brush holder 15 (see FIG. 2). . Then, the spring 11 and the brush mounting terminal 13 are inserted into the check rod 7 from the opposite side of the dish 7a in this order. After that, the brush cap 9 is inserted into the check rod 7, and the brush cap 9 is screwed into the brush insertion hole 5. In this way, the brush 3, the check bar 7, the spring 11, and the brush mounting terminal 13 are attached to the DC motor 1.

Next, the operation of inspecting the amount of wear of the brush 3 attached to the DC motor 1 as described above will be described.

When the brush 3 wears, the check rod 7 is biased toward the commutator 20 side by the spring 11, so that the portion (M) of the check rod 7 projecting from the housing 40 becomes shorter in appearance. The amount of wear of the brush 3 is visually inspected based on this reduction amount. Further, since the protruding portion (M) is equal to the wear limit length (L) of the brush 3, it is time to replace the brush 3 when the protruding portion (M) becomes invisible.

As described above, according to the present embodiment, the check rod 7 is urged toward the commutator 20 side by the spring 11 as the brush 3 is worn, and thus the portion (M) protruding from the housing 40. Gradually becomes shorter. Therefore, without removing the brush 3 from the brush insertion hole 5, it is possible to visually inspect the wear amount of the brush 3 from the reduced amount of the check rod 7 even in a small installation place. Further, since it is the time to replace the brush 3 when the check bar 7 becomes invisible, it is easy for anyone to confirm the replacement time in a short time. Further, even in the conventional DC motor, the brush mounting structure of the present invention can be realized only by forming the insertion holes 9a and 13a in the brush cap 9 and the brush mounting terminal 13 and adding the check rod 7, respectively. Is possible.

FIG. 3 is a block diagram showing a second embodiment of the present invention.

The brush mounting structure shown in this figure is different from the first embodiment shown in FIGS. 1 and 2 in that the first embodiment is mounted with the check rod 7 always inserted in the brush insertion hole 5. While the brush 3 is worn away and is urged toward the commutator 20 side by the spring 11 as the brush 3 wears, in the present embodiment, the plate portion 7a provided on the check rod 7 is eliminated and the brush 3 wears. Only when inspecting the amount, the check rod 7 is inserted through the insertion hole 9a of the brush cap 9, the insertion hole 13a of the brush mounting terminal 13, and the spring 11 to the position where it abuts on the brush 3.

In this case as well, the portion of the check rod 7 protruding from the housing becomes shorter in appearance due to wear of the brush. The amount of wear of the brush 3 can be visually inspected from this reduced amount.

As described above, also in the present embodiment, it is possible to visually inspect the wear amount of the brush 3 from the visually reduced amount of the check bar 7 as in the first embodiment. Also, the wear amount of the plurality of brushes 3 can be inspected with one check rod 7.

In each of the embodiments, the wear amount of the brush 3 is inspected based on the external reduction amount of the portion (M) where the check rod 7 projects from the housing 40. You may put a mark. As a result, the amount of wear of the brush 3 can be accurately determined, so that abnormal wear of the brush 3 can be known, and it is also possible to detect abnormalities such as a mounting error of the brush 3.

Further, in each of the embodiments, a DC motor is described as an example, but the present invention is not limited to this, and any device may be used as long as it uses a brush in a rotating machine such as a DC machine or an AC machine. It is possible to apply.

[0026]

[Effect of device]

 As described above, according to the present invention, it is possible to visually inspect the wear amount of the brush without removing the brush from the rotating machine such as the DC motor, so that anyone can easily and easily inspect the brush in a short time. It is possible to provide the structure.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a brush mounting structure according to the present invention.

2 is a cross-sectional view of the brush mounting structure shown in FIG.

FIG. 3 is a schematic view showing a second embodiment of the brush mounting structure according to the present invention.

FIG. 4 is a configuration diagram showing a conventional brush attachment structure.

5 is a cross-sectional view of the attachment mechanism of the brush shown in FIG.

[Explanation of symbols]

 1 DC Motor 3 Brush 5 Brush Insertion Hole 7 Check Rod 9 Brush Cap 9a Insertion Hole (Inspection Hole) 11 Spring 13 Brush Attachment Terminal 13a Insertion Hole (Inspection Hole) 13b Guide Claw 15 Brush Holder 17 Pigtail

Claims (1)

[Scope of utility model registration request] 1. A brush in contact with a commutator, a brush mounting terminal for urging the brush toward the commutator via a spring, and a brush cap for housing the brush in a rotary machine housing via the brush mounting terminal. A brush mounting structure comprising: a brush mounting structure having an inspection hole penetrating the brush cap and the brush mounting terminal, into which a rod for brush abrasion amount inspection is inserted.