JP2011050142A - Carbon brush and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably attach a lead wire to a brush body by a conductive powder stopper while preventing the breakdown of the brush body without causing a drop in fixing strength between the brush body and a lead wire or an increase in contact resistance. <P>SOLUTION: A carbon brush 10 includes the brush body 20, a barrel 30 which is arranged along the brim of a lead wire attaching hole 21 while being mated with a lead wire attaching hole 21 in the brush body 20 and is arranged so that the opposite end to the brush body 20 side may be flush with the edge around the lead wire attaching hole 21 of the brush body 20 or is arranged so that it may project from the edge around the lead wire attaching hole 21 in the brush body 20, a lead wire 40 which is arranged in the lead wire attaching hole 21 so as to pass inside the barrel 30, and a conductive powder 50 which is filled and pressurized between the lead wire 40 and the lead wire attaching hole 21. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a carbon brush used for an electric motor or the like and a manufacturing method thereof.

  Conventionally, when manufacturing a carbon brush, a lead wire for energization is attached to the brush body, and typically the lead wire is attached with a conductive powder stopper such as a copper powder stopper. . The lead wire is attached by fixing the copper powder by inserting the lead wire into the lead wire attachment hole formed in the brush body, filling the copper wire between the lead wire attachment hole and the lead wire in that state, and filling the filled copper powder. Is attached under pressure. Patent Documents 1 and 2 disclose attachment of lead wires by copper powder fastening.

JP 2008-154453 A JP 2006-50772 A

  By the way, when a lead wire is attached to a brush body of a small carbon brush with a copper powder stopper, the brush body may be damaged by the stress when the copper powder is pressed. In order to avoid this, it is conceivable to reduce the pressing force of the copper powder. However, if the pressing force of the copper powder is reduced, the fixing force between the brush body and the lead wire is reduced. Problems such as an increase in contact resistance occur. Therefore, there is a demand for a configuration in which the lead wire can be attached to the brush body with a conductive powder stopper while preventing the brush body from being damaged without causing a decrease in the adhesion force between the brush body and the lead wire and an increase in contact resistance. Yes.

  The present invention has been proposed in view of the above-mentioned problems, and it is possible to prevent the brush body from being damaged and to prevent the brush body from being damaged without causing a decrease in the adhesion force between the brush body and the lead wire and an increase in contact resistance. An object of the present invention is to provide a carbon brush capable of securely attaching a lead wire to a main body and a manufacturing method thereof.

The carbon brush of the present invention is a carbon brush provided with a lead wire for energization, and is fitted to the brush body and the lead wire mounting hole of the brush body, and is disposed along the periphery of the lead wire mounting hole, And the end opposite to the brush main body side is arranged so as to be flush with the end surface of the brush main body around the lead wire mounting hole, or protrudes from the end surface of the brush main body around the lead wire mounting hole. The cylinder disposed, the lead wire disposed in the lead wire mounting hole so as to pass through the cylinder, and the lead wire and the lead wire mounting hole are filled and pressurized. And a conductive powder.
In the said structure, the stress loaded on a brush main body when pressurizing electroconductive powder can be reduced with the cylinder arrange | positioned at the lead wire attachment hole of a brush main body. Therefore, it is possible to attach the lead wire to the brush body with the conductive powder stopper by applying necessary and sufficient pressure to the conductive powder while preventing the brush body from being damaged. A high-quality carbon brush having sufficient adhesion and low contact resistance can be stably obtained.

Further, in the carbon brush of the present invention, the cylindrical body is provided with a flange at an end opposite to the brush body side of the cylindrical body, and the flange is an end surface around the lead wire mounting hole of the brush body. And the end of the cylindrical body on the brush body side is disposed outside the bottom of the lead wire mounting hole.
In the above-described configuration, the end of the cylindrical body is arranged outside the bottom of the lead wire mounting hole and fixed with powder, thereby increasing the adhesion of the powder body, the cylindrical body, and the lead wire. Can do. Further, by placing the flange on the end surface around the lead wire mounting hole, the cylinder can be easily inserted into the lead wire mounting hole by a predetermined length. In addition, it is possible to eliminate the need for special processing inside the lead wire mounting hole when inserting the cylindrical body with a predetermined length.

Further, the carbon brush of the present invention has a coil spring provided around the lead wire fixed to the brush body, and an end portion of the coil spring on the brush body side is disposed on an outer periphery of the flange portion. It is characterized by that.
In the said structure, the coil spring for energizing and sliding a carbon brush can be easily attached using a collar part. In addition, since the coil spring is attached, the boss processing applied to the position corresponding to the collar portion of the carbon brush becomes unnecessary, and the manufacturing cost of the carbon brush can be reduced.

The carbon brush of the present invention is characterized in that a resin that covers the powder is provided in a region formed by the end face of the powder and the inner peripheral surface of the flange.
In the said structure, resin, such as a phenol resin, can be stably apply | coated to a predetermined area | region using the formation area | region by a powder end surface and a collar inner peripheral surface, and powder can be coat | covered. Accordingly, it is possible to more reliably prevent the conductive powder from falling off and to further increase the lead wire pull-out strength.

In the carbon brush of the present invention, the end of the cylindrical body on the brush body side is in contact with a stepped surface projecting inward below the lead wire mounting hole, and the cylindrical body is connected to the lead. The brush body is fitted into a wire mounting hole, and an end of the cylindrical body on the brush body side is disposed outside a bottom portion of the lead wire mounting hole.
In the above-described configuration, the end of the cylindrical body is arranged outside the bottom of the lead wire mounting hole and fixed with powder, thereby increasing the adhesion of the powder body, the cylindrical body, and the lead wire. Can do. Further, by bringing the end of the cylinder into contact with the stepped surface, the cylinder can be easily inserted into the lead wire mounting hole by a predetermined length.

The carbon brush manufacturing method of the present invention is a method of manufacturing a carbon brush having a lead wire for energization, wherein a cylindrical body is fitted into a lead wire mounting hole of a brush body, and the cylindrical body is inserted into the lead wire mounting hole. And the end of the cylindrical body opposite to the brush body side is disposed so as to be flush with the end surface around the lead wire mounting hole of the brush body or the brush body. A step of inserting the lead wire into the lead wire attachment hole so as to protrude from the end surface around the lead wire attachment hole and passing through the cylinder; and between the lead wire and the lead wire attachment hole And a step of filling the powder with conductive powder and a step of pressing the filled powder to fix the lead wire to the main body.
In the said structure, the stress loaded on a brush main body when pressurizing electroconductive powder can be reduced with the cylinder arrange | positioned at the lead wire attachment hole of a brush main body. Therefore, it is possible to attach the lead wire to the brush body with the conductive powder stopper by applying necessary and sufficient pressure to the conductive powder while preventing the brush body from being damaged. A high-quality carbon brush having sufficient adhesion and low contact resistance can be stably obtained.

  Further, in the method of manufacturing a carbon brush according to the present invention, in the step of arranging the cylinder in the lead wire mounting hole, the flange provided on the end of the cylinder opposite to the brush body side is provided with the flange portion. It is mounted on the end surface around the lead wire mounting hole of the brush body. In the carbon brush manufacturing method of the present invention, a coil spring is provided around the lead wire fixed to the brush body, and an end of the coil spring on the brush body side is disposed on the outer periphery of the flange portion. A process is provided. In the carbon brush manufacturing method of the present invention, after the step of fixing the lead wire to the brush body, a resin is applied to a region formed by the end surface of the powder and the inner peripheral surface of the flange portion. A step of coating the powder is provided. Further, in the method of manufacturing the carbon brush of the present invention, in the step of arranging the cylinder in the lead wire mounting hole, the step of the cylindrical body on the step surface protruding inward below the lead wire mounting hole is provided. The cylindrical body is fitted and inserted until the end on the brush body side comes into contact. These manufacturing methods have the same effects as the carbon brush having the corresponding configuration.

The electric motor of the present invention includes the carbon brush of the present invention or the carbon brush produced by the manufacturing method of the present invention.
According to the present invention, the carbon brush of the present invention or the electric motor having the effects of the manufacturing method of the present invention can be configured.

  In the present invention, it is possible to reduce the stress applied to the brush body when pressurizing the conductive powder. Therefore, it is possible to securely attach the lead wire to the brush body with the conductive powder stopper by applying necessary and sufficient pressure to the conductive powder while preventing damage to the brush body. A high-quality carbon brush having sufficient adhesion strength and low contact resistance can be obtained stably.

(A) is a front view of the carbon brush of 1st Embodiment by this invention, (b) is a longitudinal cross-sectional view of the carbon brush of the figure (a). The perspective view of the cylinder in the carbon brush of 1st Embodiment. The front view which shows the state which attached the coil spring and the cap to the carbon brush of 1st Embodiment. (A) is a front view of the carbon brush of 2nd Embodiment by this invention, (b) is a longitudinal cross-sectional view of the carbon brush of the figure (a). The perspective view of the cylinder in the carbon brush of 2nd Embodiment.

[Carbon Brush of First Embodiment and Manufacturing Method Thereof]
The carbon brush and the manufacturing method thereof according to the first embodiment of the present invention will be described. 1 is a front view and a longitudinal sectional view of a carbon brush according to a first embodiment of the present invention, FIG. 2 is a perspective view of a cylindrical body of the carbon brush according to the first embodiment, and FIG. 3 is a carbon brush according to the first embodiment. It is a front view which shows the state which attached the coil spring and the cap to.

  The carbon brush 10 of the first embodiment is used for an electric motor or the like, and is manufactured by kneading and hardening graphite powder with a binder such as a thermosetting resin, as shown in FIGS. 1 and 3. A brush body 20, a cylindrical body 30 fitted and disposed in a lead wire mounting hole 21 formed in the brush body 20, an energization lead wire 40 disposed in the lead wire mounting hole 21, A conductive powder 50 filled and pressed between the lead wire 40 and the lead wire attachment hole 21 and a resin 60 covering the powder 50 are provided.

The brush body 20 has a substantially rectangular parallelepiped shape, and a bottomed lead wire mounting hole 21 having a substantially circular shape in plan view is formed at a substantially central position of the end face 22 located on the upper side in FIG. The brush main body 20 in the present embodiment is a small-sized one having an end surface 22 as an attachment surface of the lead wire 40 having an area of about 25 mm ² or less. The present invention is more effective when applied to a small carbon brush 10 having the area or less, but can be applied to other carbon brushes.

  As shown in FIG. 2, the cylindrical body 30 has a substantially cylindrical main body 31, and a flange portion 32 is formed on one end in the axial direction of the main body 31 so as to protrude outward. 32 is provided at the end of the cylindrical body 30 opposite to the brush body 20 side. The collar portion 32 of the present embodiment is formed by bending the end portion of the main body 31 outward, and in the illustrated example, it is formed to be slightly curved, but an annular member as another member is fixed to the end portion of the main body 31. It is also possible to provide them.

  As shown in FIG. 2, the cylindrical body 30 is fitted in the lead wire mounting hole 21 of the brush body 20, is disposed along the periphery of the lead wire mounting hole 21, and is at the end opposite to the brush body 20 side. The flange portion 32 positioned at the portion is placed on the end surface 22 around the lead wire attachment hole 21 and is disposed so as to protrude outward from the end surface 22. The length of the main body 31 is shorter than the depth of the lead wire mounting hole 21, and the end of the main body 31, which is the end of the cylindrical body 30 on the brush main body 20 side, is connected to the lead wire mounting hole 21. It arrange | positions outside a bottom part, and is arrange | positioned in the depth of about the middle of the lead wire attachment hole 21 in the example of illustration.

  The vicinity of the tip of the lead wire 40 is inserted into the lead wire attachment hole 21 so as to pass through the cylindrical body 30, and is arranged in the lead wire attachment hole 21. The conductive powder 50 is filled into the lead wire mounting hole 21 through the cylindrical body 30 and filled and pressurized so as to contact the lead wire 40, the lead wire mounting hole 21 and the cylindrical body 30. The lead wire 40 is fixed to the brush body 20 by this filling and pressurization. The conductive powder 50 can be copper powder, graphite powder, iron powder, or the like.

  The resin 60 is, for example, a phenol resin, and is provided by being applied to a region formed by the end surface 51 of the powder 50 and the inner peripheral surface of the flange portion 32 so as to cover the end surface 51 of the powder 50. Yes.

  The carbon brush 10 of the present embodiment is provided with a coil spring 71 and a cap 72 as shown in FIG. The coil spring 71 is provided around the lead wire 40 fixed to the brush body 20, can be expanded and contracted in the axial direction of the lead wire 40, and slidably contacts the lower surface of the drawing by biasing the carbon brush 10. Is in contact with the commutator. The end portion of the coil spring 71 on the brush body 20 side is disposed on the outer periphery of the flange portion 32, while the end portion on the opposite side to the brush body 20 side is disposed in contact with the cap 72.

  The cap 72 covers the end of the coil spring 71 opposite to the brush body 20 side, and an insertion hole through which the lead wire 40 can be inserted is formed at the center of the cap 72.

  Next, the manufacturing method of the carbon brush 10 of 1st Embodiment is demonstrated. First, the lead wire mounting hole 21 of the lead wire 40 for energization is formed in the brush body 20. The lead wire attachment hole 21 can be formed when the brush body 20 is molded. Next, by inserting the cylinder 30 into the lead wire mounting hole 21 of the brush body 20, the main body 31 of the cylinder 30 is disposed inside the lead wire mounting hole 21 along the periphery of the lead wire mounting hole 21. The flange portion 32 of the cylindrical body 30 is disposed so as to protrude from the end surface 22 around the lead wire mounting hole 21 of the brush body 20. Thereafter, the lead wire 40 is inserted into the lead wire mounting hole 21 so as to be inserted through the cylindrical body 30.

  Then, the conductive powder 50 is filled between the lead wire 40 and the lead wire mounting hole 21, and the powder 50 is pressed to fix the lead wire 40 to the brush body 20. Further, the resin 60 is applied to the region formed by the end surface 51 of the powder 50 and the inner peripheral surface of the flange portion 32 of the cylindrical body 30 to cover the end surface 51, and thus the carbon brush 10 of the first embodiment is manufactured. Is completed.

  In the carbon brush 10 of the first embodiment, the stress or local load applied to the brush body 20 when the conductive powder 50 is pressed by the cylindrical body 30 disposed in the lead wire mounting hole 21 of the brush body 20. Stress concentration can be reduced. Therefore, it is possible to attach the lead wire 40 to the brush body 20 with the conductive powder 50 stopped by applying necessary and sufficient pressure to the conductive powder 50 while preventing the brush body 20 from being damaged. Further, a high-quality carbon brush having a sufficient fixing force between the brush body 50 and the lead wire 40 and a low contact resistance can be obtained stably.

  Further, by arranging the end portion of the cylindrical body 30 outside the bottom portion of the lead wire mounting hole 21 and fixing the powder, the brush body 50 made of the powder 50, the cylindrical body 30, and the lead wire 40 can be combined. The fixing force can be increased. Further, by placing the flange portion 32 of the cylindrical body 30 on the end surface 22 around the lead wire mounting hole 21, the cylindrical body 30 can be easily inserted into the lead wire mounting hole 21 by a predetermined length. Further, it is possible to eliminate the need for special processing inside the lead wire mounting hole 21 when inserting the cylindrical body 30 into a predetermined length. Further, the coil spring 71 for biasing and sliding the carbon brush 10 can be easily attached using the flange portion 32 of the cylindrical body 30. Further, since the coil spring 71 is attached, the boss processing applied to the position corresponding to the flange portion 32 of the carbon brush 10 becomes unnecessary, and the manufacturing cost of the carbon brush 10 can be reduced.

  Further, the resin 60 covers the region formed by the end surface of the powder 50 and the inner peripheral surface of the flange 32, so that the powder 50 can be reliably prevented from falling off and the pulling strength of the lead wire 40 can be increased. Can do.

[Carbon Brush of Second Embodiment and Manufacturing Method Thereof]
Next, the carbon brush of 2nd Embodiment and its manufacturing method are demonstrated. 4 is a front view and a longitudinal sectional view of a carbon brush according to a second embodiment of the present invention, and FIG. 5 is a perspective view of a cylindrical body in the carbon brush according to the second embodiment.

  As shown in FIG. 4, the carbon brush 10a according to the second embodiment includes a brush body 20a, a cylindrical body 30a that is placed in a lead wire mounting hole 21a formed in the brush body 20a, and a lead wire. 40, a conductive powder 50a filled and pressed between the lead wire 40 and the lead wire mounting hole 21a, and a resin 60a covering the powder 50a. Here, about the same structure as the carbon brush of 1st Embodiment, the same code | symbol is provided and detailed description is abbreviate | omitted.

  The brush body 20a has a cylindrical shape having a step, and an end surface 22a, which is an upper surface in FIG. 4 and serves as a mounting surface of the lead wire 40, is formed with a reduced diameter. A bottomed lead wire mounting hole 21a having a substantially circular shape in plan view is formed at a substantially central position of the end surface 22a, and a step surface 23a protruding inward is formed below the lead wire mounting hole 21a. Yes.

  As shown in FIG. 5, the cylindrical body 30a has a substantially cylindrical shape, and is fitted into the lead wire mounting hole 21a of the brush body 20a, whereby the lead wire mounting hole 21a is formed along the periphery of the lead wire mounting hole 21a. Placed inside. The cylindrical body 30a is inserted into the lead wire mounting hole 21a until the end of the brush body 21a contacts the stepped surface 23a projecting inward below the lead wire mounting hole 21a. The end of the body 30a on the brush body 21a side is disposed outside the bottom of the lead wire mounting hole 21a. In addition, due to the contact with the stepped surface 23a, the end of the cylindrical body 30a opposite to the brush main body 20a is disposed so as to be flush with the end surface 22a around the lead wire mounting hole 21a of the brush main body 20a. ing.

  The conductive powder 50a is filled in the lead wire mounting hole 21a through the cylindrical body 30a, and is filled and pressurized so as to contact the lead wire 40, the lead wire mounting hole 21a, and the cylindrical body 30a. The lead wire 40 is fixed to the brush body 20a by this filling and pressing. The conductive powder 50a can be copper powder, graphite powder, iron powder, or the like.

  The resin 60a is provided so as to cover at least the end face 51a of the powder 50a. In the second embodiment, the resin 60a is provided so as to cover the end face 22a, the end face of the cylindrical body 30a, and the end face 51a of the powder 50a. .

  Next, the manufacturing method of the carbon brush 10a of 2nd Embodiment is demonstrated. First, the lead wire mounting hole 21a of the lead wire 40 for energization is formed in the brush body 20a. The lead wire attachment hole 21a can be formed when the brush body 20a is molded. Next, by inserting the cylinder 30a into the lead wire mounting hole 21a of the brush body 20a, the cylinder 30a is disposed inside the lead wire mounting hole 21a along the periphery of the lead wire mounting hole 21a. At this time, the end of the cylinder body 30a on the brush body 21a side contacts the stepped surface 23a projecting inwardly below the lead wire mounting hole 21a, so that the cylinder body 30a is opposite to the brush body 20a side. Is arranged so as to be flush with the end surface 22a around the lead wire mounting hole 21a of the brush body 20a of the cylindrical body 30a. Next, the lead wire 40 is inserted into the lead wire mounting hole 21 so as to be inserted through the cylindrical body 30a.

  Then, the conductive powder 50a is filled between the lead wire 40 and the lead wire mounting hole 21a, and the powder 50a is pressurized to fix the lead wire 40 to the brush body 20a. Further, a resin 60a is applied to a region formed by the end surface 51a of the powder 50a and the inner peripheral surface of the main body 31a of the cylinder 30a to cover at least the end surface 51a. In the second embodiment, the end surface 22a and the cylinder 30a are covered. The end face 51a and the end face 51a are covered to complete the manufacture of the carbon brush 10a.

  The carbon brush 10a of the second embodiment reduces the stress applied to the brush body 20a when the conductive powder 50a is pressurized by the cylinder 30a disposed in the lead wire mounting hole 21a of the brush body 20a. be able to. Therefore, it is possible to attach the lead wire 40 to the brush body 20a with the conductive powder 50a stopped by applying necessary and sufficient pressure to the conductive powder 50a while preventing the brush body 20a from being damaged. In addition, a high-quality carbon brush having a sufficient adhesion force between the brush body 20a and the lead wire 40 and a low contact resistance can be stably obtained.

  In addition, by arranging the end of the cylinder 30a outside the bottom of the lead wire mounting hole 21a and fixing the powder, the brush body 20a, the cylinder 30a and the lead wire 40 made of the powder 50a The fixing force can be increased. Further, since the end of the cylindrical body 30a abuts on the stepped surface 23a of the lead wire mounting hole 21a, the cylindrical body 30a can be easily inserted into the lead wire mounting hole 21a by a predetermined length. The end opposite to the brush body 20a side can be flush with the end surface 22a around the lead wire mounting hole 21a of the brush body 20a, and appropriate pressing of the powder 50a can be easily performed.

  Further, by covering the region formed by at least the end surface 51a of the powder 50a with the resin 60a, such as covering the end surface 22a of the brush body 20a, the end surface of the cylindrical body 30a, and the end surface 51a, the powder 50a The drop-out can be reliably prevented, and the pull-out strength of the lead wire 40 can be increased.

[Modifications of Embodiment, etc.]
In addition to the configurations of the inventions and embodiments, the invention disclosed in the present specification is specified by changing these partial configurations to other configurations disclosed in the present specification within the applicable range, or these Including those specified by adding other configurations disclosed in this specification, or those obtained by deleting these partial configurations to the extent that partial effects can be obtained, These modifications are also included.

  For example, in the first embodiment, the collar portion 32 is provided on the cylindrical body 30, but the end portion on the opposite side of the brush body 20 of the cylindrical body 30 is attached to the lead wire of the brush main body 20 without providing the collar portion 32. A configuration that protrudes from the end surface 22 around the hole 21 may be used. Further, in the second embodiment, without forming the stepped surface 23a in the lead wire mounting hole 21a, the length of the cylindrical body 30a is substantially the same as the depth of the lead wire mounting hole 21a, and the cylindrical body 30a is replaced with the lead wire mounting hole 21a. The end of the cylindrical body 30a opposite to the brush body 20a side may be configured to be flush with the end surface 22a around the lead wire mounting hole 21a of the brush body 20a.

  Further, the inner wall or the outer wall of the cylinders 30 and 30a or both of them are formed into a rough surface by forming fine irregularities or the like, or through holes are formed at appropriate portions of the main body 31 and the cylinder 30a of the cylinder 30. Alternatively, it is possible to form a slit from the end on the brush main body 20 or 20a side to the middle, and make the powder enter the through hole or slit to increase the fixing force.

  The present invention can be used for, for example, a carbon brush or an electric motor including the carbon brush.

DESCRIPTION OF SYMBOLS 10, 10a ... Carbon brush 20, 20a ... Brush main body 21, 21a ... Lead wire attachment hole 22, 22a ... End surface 23a ... Step surface 30, 30a ... Cylindrical body 31 ... Main body 32 ... Gutter 40 ... Lead wire 50, 50a ... Powder 51, 51a ... End face 60, 60a ... Resin 71 ... Coil spring 72 ... Cap

Claims (7)

A carbon brush having a lead wire for energization,
The brush body,
An end surface of the brush body around the lead wire mounting hole is fitted into the lead wire mounting hole of the brush body, arranged along the periphery of the lead wire mounting hole, and the end opposite to the brush body side A cylinder that is arranged so as to be flush with the cylindrical body, or arranged so as to protrude from an end surface around the lead wire mounting hole of the brush body,
A lead wire disposed in the lead wire mounting hole so as to pass through the cylindrical body,
A carbon brush comprising: conductive powder filled and pressed between the lead wire and the lead wire mounting hole. The cylindrical body is provided with a collar at the end opposite to the brush body side of the cylindrical body,
The flange is placed on an end surface around the lead wire mounting hole of the brush body,
The carbon brush according to claim 1, wherein an end portion of the cylindrical body on the brush body side is disposed outside a bottom portion of the lead wire attachment hole. A coil spring provided around the lead wire fixed to the brush body;
The carbon brush according to claim 2, wherein an end portion of the coil spring on the brush main body side is disposed on an outer periphery of the flange portion.   The carbon brush according to claim 2 or 3, wherein a resin that covers the powder is provided in a region formed by an end face of the powder and an inner peripheral surface of the flange. The cylindrical body is fitted and inserted into the lead wire mounting hole so as to abut the end of the cylindrical body on the brush body side with a stepped surface projecting inward below the lead wire mounting hole,
The carbon brush according to claim 1, wherein an end portion of the cylindrical body on the brush body side is disposed outside a bottom portion of the lead wire attachment hole. A method for producing a carbon brush comprising a lead wire for energization,
A cylindrical body is fitted into the lead wire mounting hole of the brush body, the cylindrical body is disposed along the periphery of the lead wire mounting hole, and the end of the cylindrical body opposite to the brush body side is the brush. The lead is disposed so as to be flush with the end surface around the lead wire mounting hole of the main body, or is disposed so as to protrude from the end surface around the lead wire mounting hole of the brush main body, and passes through the cylinder. Inserting a lead wire into the wire mounting hole;
Filling a conductive powder between the lead wire and the lead wire mounting hole;
Pressing the filled powder to fix the lead wire to the body;
A method for producing a carbon brush comprising:   An electric motor comprising the carbon brush according to claim 1.

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