CN110233403B

CN110233403B - Brush holder

Info

Publication number: CN110233403B
Application number: CN201910420491.8A
Authority: CN
Inventors: 倪鑫根
Original assignee: Hangzhou Duobao Electronics Co ltd
Current assignee: Hangzhou Duobao Electronics Co ltd
Priority date: 2019-05-20
Filing date: 2019-05-20
Publication date: 2020-07-21
Anticipated expiration: 2039-05-20
Also published as: CN110233403A

Abstract

The invention provides a brush holder, comprising: the middle part of the brush holder support is provided with a wiring groove which runs through the front surface and the back surface; the conducting circuit sheet is embedded in the brush frame support; the brush holder support is made of insulating materials and is integrally formed with the conducting circuit sheet through injection molding; the brush yoke support surface is equipped with a plurality of constant head tanks of moulding plastics, the bottom of the constant head tank of moulding plastics has the plastics bottom plate of moulding plastics formation. The plastic bottom plate is arranged at the bottom of the injection molding positioning groove, the conductive circuit sheet is not exposed on the outer surface, the conductive circuit sheet is effectively prevented from being exposed on the outer surface, and the non-welding part of the conductive circuit sheet positioned on the injection molding positioning groove is not corroded.

Description

Brush holder

Technical Field

The invention relates to the field of automobile parts, in particular to a brush holder.

Background

At present, a brush holder assembly of an automobile generator comprises a brush holder and a regulator connected to the brush holder, wherein the brush holder comprises a metal circuit board and an injection molding shell injected on the surface of the metal circuit board. In the injection molding process of the brush yoke, the ejector pin is required to be used for propping the conductive circuit sheet, so that the injection molding positioning groove is formed after injection molding, the conductive circuit sheet of the injection molding positioning groove is exposed on the outer surface, and the non-welding part is positioned on the injection molding positioning groove conductive circuit sheet and is easily corroded.

For example, in the prior art, as disclosed in patent document 1: CN201120529834.3, the utility model provides a brush holder assembly of an automobile generator, which comprises a plastic part, a metal circuit sheet injected into the plastic part, and an adjuster arranged on the plastic part, wherein the adjuster is covered with a protective cover connected with the plastic part. In some cases, the metal wiring board is likely to be burred or deformed in the punching step. Its in-process of moulding plastics that has the brush yoke, need withhold the conducting wire piece with the thimble for it forms the constant head tank of moulding plastics after moulding plastics, and the conducting wire piece of the constant head tank of should moulding plastics exposes at the surface outward, makes the defect that the constant head tank conducting wire piece is corroded easily that is located of non-welded part.

Disclosure of Invention

Technical problem to be solved

The invention aims to provide a brush holder, wherein a brush holder support is made of an insulating material and is integrally formed with a conductive circuit sheet through injection molding; the surface of the brush holder support is provided with a plurality of injection molding positioning grooves, and the bottoms of the injection molding positioning grooves are provided with plastic bottom plates formed by injection molding; the problem of present conducting wire piece of the constant head tank of moulding plastics expose at the external surface for non-welded part be located the easy defect that is corroded of constant head tank conducting wire piece of moulding plastics.

Another object of the present invention is to provide a brush holder, wherein the first member and the second member on both sides of the first punching groove are provided with stamped and formed arched reinforcing ribs protruding outward from the front surface of the brush holder support, so as to solve the problem that the metal circuit board of the existing brush holder assembly is easy to generate burrs or deform in the punching process.

(II) technical scheme

In order to solve the above technical problem, the present invention provides a brush holder, including:

the middle part of the brush holder support is provided with a wiring groove which runs through the front surface and the back surface; the conducting circuit sheet is embedded in the brush frame support; the brush holder support is made of insulating materials and is integrally formed with the conducting circuit sheet through injection molding; the brush yoke support surface is equipped with a plurality of constant head tanks of moulding plastics, the bottom of the constant head tank of moulding plastics has the plastics bottom plate of moulding plastics formation. The plastic bottom plate is arranged at the bottom of the injection molding positioning groove, the conductive circuit sheet is not exposed on the outer surface, the conductive circuit sheet is effectively prevented from being exposed on the outer surface, and the non-welding part of the conductive circuit sheet positioned on the injection molding positioning groove is not corroded.

Preferably, the middle part of the brush holder support is provided with a wiring groove which runs through the front surface and the back surface; the conductive circuit sheet comprises a first part and a second part which are disconnected with each other, one ends of the first part and one ends of the second part are integrated and exposed in the wiring groove, a first punching groove is formed between the parts, exposed in the wiring groove, of the first part and the second part in a punching mode, and arch-shaped reinforcing ribs protruding outwards towards the front face of the brush holder support are formed on the first part and the second part on two sides of the first punching groove in a punching mode. The metal circuit board of the existing brush holder assembly is easy to generate burrs or deform in the punching process. The invention provides a reinforcing rib near the punched parts of the first part and the second part of the conductive circuit sheet, which improves the strength of the connecting bridge of the first part and the second part and effectively prevents the connecting bridge of the first part and the second part from generating burrs or deforming in the punching process.

Preferably, the conductive trace piece further comprises a third member disconnected from the first member and the second member, one end of the third member is integrated with and exposed in the wiring groove, and the part of the third member exposed in the wiring groove is positioned on one side of the part of the second member exposed in the wiring groove and away from the part of the first member exposed in the wiring groove. The invention further integrates the third component in the wiring slot, and the welding spots of the third component are concentrated, so that the management is convenient.

Preferably, a second punching groove is formed by punching between the parts of the second part and the third part, which are exposed in the wire connecting groove, and an arched reinforcing rib which is formed by punching and protrudes to the front surface of the brush holder support is also arranged on the third part at one side of the second punching groove; the reinforcing ribs on the two sides of the first punching groove and the second punching groove are positioned on the same extension straight line. The third member of the present invention on the side where the second cut-off groove is provided is similarly provided with an arched reinforcing rib which is formed by punching and protrudes outward toward the front face of the holder support, and the arched reinforcing rib is easy to manufacture, and the strength of the connecting bridge of the second member and the third member is improved, which effectively prevents the connecting bridge of the second member and the third member from being burred or deformed during the punching process.

Preferably, the other end of the first component is fixedly connected with a first wiring end, the second component is fixedly connected with a second wiring end, the brush holder support is provided with two carbon brushes on one side of the wiring groove, brush holes penetrating through two ends of the carbon brushes are formed in the carbon brushes, the brush holes of the two carbon brushes are mutually isolated, and the first wiring end and the second wiring end are embedded into one end of the carbon brushes. According to the invention, the other end of the first component is fixedly connected with a first wiring end, the second component is fixedly connected with a second wiring end, the brush frame support is provided with two carbon brushes at one side of the wiring groove, the carbon brushes are internally provided with brush holes penetrating through two ends of the carbon brushes, the brush holes of the two carbon brushes are mutually isolated, the first wiring end and the second wiring end are embedded into one end of the carbon brushes, and the positions of the carbon brushes are relatively fixed, so that a plug can be conveniently and directly inserted into the first wiring end and fixed.

Preferably, the second component is an arched bending sheet with two ends positioned at the same side, the second terminal is provided with an arch back area of the bending sheet, and the second terminal is provided with a first welding ring; a first welding fixing groove matched with the first welding ring is formed in the brush holder support, so that the upper surface and the lower surface of the first welding ring are partially exposed; one end of the bending sheet, which is far away from the wiring groove, is provided with a first connecting sheet contact part; the inner side of the arch belly of the bending piece is provided with a convex first contact piece, the inner side of the second part is also provided with a convex transverse contact piece, the transverse contact piece is provided with a height position different from that of the first breaking groove, and two ends of the transverse contact piece are embedded in the wiring groove. The second component is an arched bending sheet with two ends positioned at the same side, the second terminal is provided with an arch back area of the bending sheet, and the second terminal is provided with a first welding ring; a first welding fixing groove matched with the first welding ring is formed in the brush holder support, so that the upper surface and the lower surface of the first welding ring are partially exposed; one end of the bending sheet, which is far away from the wiring groove, is provided with a first connecting sheet contact part; the bending piece is characterized in that a convex first contact piece is arranged on the inner side of the arch belly of the bending piece, a convex transverse contact piece is further arranged on the inner side of the second component, the transverse contact piece is provided with a height position different from that of the first breaking groove, two ends of the transverse contact piece are embedded in the wiring groove, the structure is ingenious, and the multiple components are integrated inside the bending piece, so that the size of the whole body is reduced, and the installation is facilitated. Preferably, a limiting supporting block is further arranged in the wiring groove, the limiting supporting block is located between the cross contact piece and the first punching groove, and the limiting supporting block is used for supporting and fixing the brush holder to enable the brush holder not to be prone to shifting.

Preferably, the brush holder further comprises a fourth part and a fifth part which are disconnected from the first part and the second part, wherein one end of each of the fourth part and the fifth part is integrated and exposed in the wiring groove, a third punching groove is formed between the parts, exposed in the wiring groove, of the fourth part and the fifth part, and the fourth part and the fifth part on two sides of the third punching groove are provided with arch-shaped reinforcing ribs which are formed by punching and protrude outwards towards the front face of the brush holder support. The fourth part and the fifth part which are arranged at two sides of the third punching groove are respectively provided with the punched arched reinforcing rib which protrudes outwards to the front side of the brush holder support, so that the strength of the connecting bridge of the fourth part and the fifth part is improved, and the connecting bridge of the fourth part and the fifth part is effectively prevented from generating burrs or deforming in the punching process.

Preferably, the other end of the fifth part is bent to bypass the wiring groove, extends to the end far away from the first welding ring and is fixedly connected with the second welding ring; a second welding fixing groove matched with the second welding ring is formed in the brush holder support, so that the upper surface and the lower surface of the second welding ring are partially exposed; a second connecting sheet contact part arranged opposite to the first connecting sheet contact part is further arranged on one side of the second welding ring; the brush holder support is provided with a connecting piece accommodating groove, the first connecting piece contact part and the second connecting piece contact part are locally installed in the connecting piece accommodating groove, and the front surface and the back surface of the connecting piece are at least locally exposed. The other end of the fifth part is bent to bypass the wiring groove, extends to the end far away from the first welding ring and is fixedly connected with the second welding ring; a second welding fixing groove matched with the second welding ring is formed in the brush holder support, so that the upper surface and the lower surface of the second welding ring are partially exposed; a second connecting sheet contact part arranged opposite to the first connecting sheet contact part is further arranged on one side of the second welding ring; the brush yoke support is provided with a connecting piece accommodating groove, the first connecting piece contact part and the second connecting piece contact part are locally installed in the connecting piece accommodating groove, and the front surface and the back surface of the first connecting piece contact part and the back surface of the second connecting piece contact part are at least locally exposed, so that the connecting piece part can be conveniently fixed and is not easy to shift.

Preferably, the other end of the third component is provided with an arc-shaped welding arc, the brush holder support is provided with a third welding fixing groove matched with the welding arc in the direction, and the welding arc is fixed in the third welding fixing groove and is partially exposed. According to the invention, the other end of the third component is provided with an arc-shaped welding arc, the brush holder support is provided with a third welding fixing groove which is matched with the welding arc in the direction, and the welding arc is fixed in the third welding fixing groove and is partially exposed, so that the welding fixing is facilitated.

Preferably, the other end of the fourth component extends towards the arch of the bending piece and is provided with a second contact piece arranged opposite to the first contact piece, and a fixing frame is arranged in the wiring groove and used for fixing the first contact piece and the second contact piece and enabling the upper surface and the lower surface of the first contact piece and the upper surface and the lower surface of the second contact piece to be partially exposed. According to the invention, the other end of the fourth component extends towards the arch of the bending sheet and is provided with the second contact sheet which is arranged opposite to the first contact sheet, the wiring groove is internally provided with the fixing frame for fixing the first contact sheet and the second contact sheet, so that the upper surface and the lower surface of the first contact sheet and the upper surface and the lower surface of the second contact sheet are partially exposed, and the wiring groove is convenient for welding parts such as wiring terminals and the like.

Preferably, be equipped with the welding between second part and the third part and have the wiring inserted sheet, the brush yoke support openly is equipped with the terminal cylinder of evagination, wiring inserted sheet end stretches into in the terminal cylinder of connecting. According to the invention, the wiring inserting sheet is welded between the second part and the third part, the convex wiring barrel is arranged on the front surface of the brush frame support, and the tail end of the wiring inserting sheet extends into the wiring barrel, so that a wiring head is conveniently and fixedly installed and is convenient to butt.

(III) advantageous effects

The brush holder provided by the invention has the following advantages:

1. the plastic bottom plate is arranged at the bottom of the injection molding positioning groove, the conductive circuit sheet is not exposed on the outer surface, the conductive circuit sheet is effectively prevented from being exposed on the outer surface, and the non-welding part of the conductive circuit sheet positioned on the injection molding positioning groove is not corroded.

2. The invention provides a reinforcing rib near the punched parts of the first part and the second part of the conductive circuit sheet, which improves the strength of the connecting bridge of the first part and the second part and effectively prevents the connecting bridge of the first part and the second part from generating burrs or deforming in the punching process.

Drawings

Fig. 1 is a structure diagram of a conductive wiring sheet of embodiment 1 of the present invention;

FIG. 2 is a reverse perspective view of a brush holder according to embodiment 1 of the present invention;

FIG. 3 is a front view of a brush holder according to embodiment 1 of the present invention;

FIG. 4 is a side view of a brush holder according to example 1 of the present invention;

FIG. 5 is a front view of a brush holder according to embodiment 2 of the present invention;

FIG. 6 is a sectional view of a brush holder A-A according to example 2 of the present invention.

1. A first member, 2, a second member, 3, a third member, 4, a fourth member, 5, a fifth member, 6, a first punching groove, 7, a second punching groove, 8, a third punching groove, 9, a wiring groove, 10, a reinforcing rib, 11, a first terminal, 12, a second terminal, 13, a first welding ring, 14, a first welding fixing groove, 15, a first connecting piece contact portion, 16, a first contact piece, 17, a cross contact piece, 18, a second welding ring, 19, a second welding fixing groove, 20, a second connecting piece contact portion, 21, a connecting piece accommodating groove, 22, a welding arc, 23, a third welding fixing groove, 24, a second contact piece, 25, a wiring insertion piece, 26, a wiring barrel, 27, a rectangular frame body, 28, a carbon brush, 29, a brush hole, 30, a limit support block, 31, a wiring insertion post, 32, a wiring holder, 33, an injection molding positioning groove, 100, a brush holder support, 200. conductive circuit sheets.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; may be mechanically coupled, directly coupled, or indirectly coupled through an intermediary. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The front side of the brush holder is the side with the opening of the wiring cylinder facing upwards, and the reverse side is the reverse side.

Example 1

As shown in fig. 1, 2, 3 and 4, the present invention discloses a brush holder, including: the middle part of the brush holder support 100 is provided with a wiring groove 9 which runs through the front surface and the back surface; and a conductive circuit sheet 200 embedded in the brush holder support; the brush holder body and the brush holder support are made of insulating materials and are integrally formed with the conductive circuit sheet through injection molding; the brush yoke support surface is equipped with a plurality of constant head tanks 33 of moulding plastics, the bottom of the constant head tank of moulding plastics has the plastics bottom plate of moulding plastics formation.

The conductive trace sheet includes a first part 1, a second part 2, a third part 3, a fourth part 4, and a fifth part 5 which are disconnected from each other. The first part and the second part are provided with one ends which are integrated and exposed in the wiring groove, a first punching groove 6 formed by punching is arranged between the parts of the first part and the second part which are exposed in the wiring groove, and the first part and the second part on two sides of the first punching groove are provided with arch-shaped reinforcing ribs 10 which are formed by punching and protrude outwards towards the front side of the brush holder support. One end of the third component is integrated with and exposed in the wiring groove, and the part of the third component exposed in the wiring groove is positioned on one side of the part of the second component exposed in the wiring groove and is far away from the part of the first component exposed in the wiring groove. Wherein, a second breaking groove 7 formed by breaking is arranged between the parts of the second part and the third part exposed in the wiring groove, and an arched reinforcing rib which is formed by stamping and protrudes outwards to the front surface of the brush holder support is also arranged on the third part at one side of the second breaking groove; the reinforcing ribs on the two sides of the first punching groove and the second punching groove are positioned on the same extension straight line. The outer edges of the upper surface and the lower surface of the wiring slot are provided with protruding rectangular frames 27. Be equipped with the welding between second part and the third part and have wiring inserted sheet 25, the brush yoke support openly is equipped with the terminal cylinder 26 of evagination, wiring inserted sheet end stretches into in the terminal cylinder of connecting. The invention can also be provided without a wiring barrel and a wiring inserting sheet.

The fourth component and the fifth component are provided with one ends which are integrated and exposed in the wiring groove, a third punching groove 8 formed by punching is arranged between the parts, exposed in the wiring groove, of the fourth component and the fifth component, and the fourth component and the fifth component on two sides of the third punching groove are provided with arched reinforcing ribs formed by punching and protruding outwards towards the front face of the brush holder support.

The other end of the first component is fixedly connected with a first wiring end 11, the second component is fixedly connected with a second wiring end 12, the brush holder support is arranged on one side of the wiring groove and is provided with two carbon brushes, brush holes penetrating through two ends of the carbon brushes are formed in the carbon brushes and are mutually isolated, and the first wiring end and the second wiring end are embedded into one end of each carbon brush.

The second component is an arched bending sheet with two ends positioned at the same side, a second terminal is provided with an arch back area of the bending sheet, and the second terminal is provided with a first welding ring 13; a first welding fixing groove 14 matched with the first welding ring is formed in the brush holder support, so that the upper surface and the lower surface of the first welding ring are partially exposed; one end of the bending sheet, which is far away from the wiring groove, is provided with a first connecting sheet contact part 15; the inner side of the arch belly of the bent piece is provided with a convex first contact piece 16, the inner side of the second part is also provided with a convex transverse contact piece 17, the tail end of the transverse contact piece is provided with a height position different from that of the first breaking groove, and two ends of the transverse contact piece are embedded in the wiring groove.

The other end of the third component is provided with an arc-shaped welding arc 22, the brush holder support is provided with a third welding fixing groove 23 matched with the welding arc in the direction of the welding arc, and the welding arc is fixed in the third welding fixing groove and is partially exposed.

The other end of the fourth component extends towards the arch of the bent sheet and is provided with a second contact sheet 24 arranged opposite to the first contact sheet, and a fixing frame is arranged in the wiring groove and used for fixing the first contact sheet and the second contact sheet and enabling the upper surface and the lower surface of the first contact sheet and the upper surface and the lower surface of the second contact sheet to be partially exposed.

The other end of the fifth part is bent to bypass the wiring groove, extends to the end far away from the first welding ring and is fixedly connected with a second welding ring 18; a second welding fixing groove 19 matched with the second welding ring is formed in the brush holder support, so that the upper surface and the lower surface of the second welding ring are partially exposed; a second connecting sheet contact part 20 is arranged on one side of the second welding ring and is opposite to the first connecting sheet contact part; the brush yoke support is provided with a connecting sheet accommodating groove 21, the first connecting sheet contact part and the second connecting sheet contact part are locally installed in the connecting sheet accommodating groove, and the front surface and the back surface of the connecting sheet contact part are at least locally exposed. And a limiting support block 30 is further arranged in the wiring groove, is positioned between the cross contact piece and the first punching groove and is used for supporting and fixing the brush holder to enable the brush holder not to be prone to shifting.

In this embodiment, a metal circuit board of an integrated structure is stamped in a first step, where the metal circuit board includes a first component, a second component, a third component, a fourth component, and a fifth component that are connected together by a connecting bridge; secondly, forming an injection molding inner layer which fixes the first part, the second part, the third part, the fourth part and the fifth part together on the metal circuit board in an injection molding way, wherein only one side of the metal circuit board in the thickness direction is arranged in the injection molding inner layer; thirdly, the connecting bridge is broken, so that the first part, the second part, the third part, the fourth part and the fifth part are broken to be fixed together only by the injection molding inner layer; welding the binding post and the connecting sheet; when the conductive circuit board is injected, the ejector pin is abutted against the conductive circuit board, part of plastic is injected into the mold cavity, and the ejector pin is withdrawn while glue injection is continued, so that the withdrawn ejector pin is continuously filled with the plastic, and a pin hole is not exposed.

Example 2

As shown in fig. 5 and 6, embodiment 2 differs from embodiment 1 in that a terminal post 31 is welded between the second member and the third member, and a convex terminal holder 32 is provided on the front surface of the brush holder support and fixed in the terminal holder.

The above embodiments are only used for illustrating the present invention, and the structure, connection mode and the like of each component can be changed, and all equivalent changes and improvements made on the basis of the technical scheme of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A brush holder, comprising:

a brush holder support (100);

and a conductive circuit sheet (200) embedded in the brush holder support; the surface of the brush holder support is provided with a plurality of injection molding positioning grooves (33), and the bottoms of the injection molding positioning grooves are provided with plastic bottom plates formed by injection molding; the middle part of the brush holder support is provided with a wiring groove (9) which runs through the front surface and the back surface; the conductive circuit sheet comprises a first part (1) and a second part (2) which are disconnected with each other, one ends of the first part and one end of the second part are integrated and exposed in a wiring groove, a first punching groove (6) is formed between the parts, exposed in the wiring groove, of the first part and the second part, the first part and the second part on two sides of the first punching groove are respectively provided with an arched reinforcing rib (10) which is formed by punching and protrudes outwards towards the front face of the brush holder support, and the extending direction of the reinforcing rib is basically vertical to the extending direction of the first punching groove;

a second wiring end (12) is fixedly connected to the second component, the second component is an arched bending sheet with two ends positioned on the same side, the second wiring end is provided with an arch back area of the bending sheet, and the second wiring end is provided with a first welding ring (13); a first welding fixing groove (14) matched with the first welding ring is formed in the brush holder support, so that the upper surface and the lower surface of the first welding ring are partially exposed; one end of the bending sheet, which is far away from the wiring groove, is provided with a first connecting sheet contact part (15); a convex first contact piece (16) is arranged on the inner side of the arch belly of the bending piece, a convex transverse contact piece (17) is further arranged on the inner side of the second part, the transverse contact piece has a height position different from that of the first breaking groove, and two ends of the transverse contact piece are embedded in the wiring grooves; and a limiting supporting block is further arranged in the wiring groove and is positioned between the cross contact piece and the first punching groove.

2. A brush holder according to claim 1, wherein the conductive trace further comprises a third member (3) disconnected from the first member and the second member, the third member being integrated with and exposed in the wiring groove at one end thereof, the portion of the third member exposed in the wiring groove being located on the side of the portion of the second member exposed in the wiring groove and away from the portion of the first member exposed in the wiring groove; the second part and the third part are exposed between the parts of the wiring grooves and are provided with a second punching groove (7) formed by punching, and the third part at one side of the second punching groove is also provided with an arched reinforcing rib which is formed by punching and protrudes outwards towards the front side of the brush holder support; the reinforcing ribs on the two sides of the first punching groove and the second punching groove are positioned on the same extension straight line.

3. A brush holder according to claim 2, wherein the other end of the first member is fixedly connected to a first terminal (11), the brush holder support has two carbon brushes (28) at one side of the wiring groove, the carbon brushes have brush holes (29) formed therethrough, the brush holes of the two carbon brushes are spaced apart from each other, and the first terminal and the second terminal are embedded in one end of the carbon brushes.

4. A brush holder according to claim 3, further comprising a fourth part (4) and a fifth part (5) disconnected from the first and second parts, the fourth and fifth parts each having one end integral with and exposed in the wiring groove, and the fourth and fifth parts each having a third punched groove (8) formed by punching between the parts exposed in the wiring groove, the fourth and fifth parts on either side of the third punched groove each having a punched arched reinforcing rib projecting outwardly from the front face of the holder support.

5. A brush holder according to claim 4, wherein the other end of the fifth part is bent around the terminal groove to extend away from the first solder ring and is fixedly connected to a second solder ring (18); a second welding fixing groove (19) matched with the second welding ring is formed in the brush holder support, so that the upper surface and the lower surface of the second welding ring are partially exposed; a second connecting sheet contact part (20) is arranged on one side of the second welding ring and opposite to the first connecting sheet contact part; the brush yoke support is provided with a connecting piece accommodating groove (21), the first connecting piece contact part and the second connecting piece contact part are locally installed in the connecting piece accommodating groove, and the front surface and the back surface of the connecting piece are at least locally exposed.

6. A brush holder according to claim 2, 3, 4 or 5, characterized in that the other end of the third member is provided with an arc-shaped welding arc (22), and the holder base is provided with a third welding holder groove (23) adapted to the welding arc, in which third welding holder groove the welding arc is fixed and partly exposed.

7. A brush holder according to claim 4 or 5, wherein the other end of the fourth member extends towards the soffit of the bent piece and is provided with a second contact piece (24) arranged opposite the first contact piece, and the wiring groove is provided with a fixing frame for fixing the first contact piece and the second contact piece such that the upper and lower surfaces of the first contact piece and the second contact piece are partially exposed.

8. A brush holder according to claim 2, 3, 4 or 5, characterized in that a terminal lug (25) is welded between the second part and the third part, and the front side of the brush holder support is provided with a convex terminal barrel (26), and the terminal of the terminal lug extends into the terminal barrel.