KR100990876B1 - Brush Plate and Brush Card and Manufacturing Method of Brush Card for DC Motor - Google Patents

Abstract

The present invention relates to a brush plate.

According to the present invention, a brush plate having a through hole having a predetermined size in a center thereof and formed radially around the through hole includes a first plate and a second plate, wherein the first plate and the second plate Provided is a brush plate, which is integrally formed via a separation scheduled portion.

According to the present invention, by adopting a method of cutting the brush plate after insert molding so that the brush plate and the brush card are integrally formed, the effect of speeding up the assembly process of the brush card and the hole for fixing the brush holder are formed in the brush plate. This is effective in preventing thermal deformation of the brush card.

DC motor, brush, brush plate, brush holder, brush card

Description

Brush plate and brush card and manufacturing method of brush card for dc motor

1 is a cross-sectional view of a DC motor according to the prior art,

2 is a cross-sectional view taken along the line AA ′ of FIG. 1;

3 is a cross-sectional view taken along the line BB ′ of FIG. 1;

4 is a cross-sectional view of a brush plate according to the first embodiment of the present invention;

5 is a partial cutaway sectional view of a brush card for a direct-current motor according to a second embodiment of the present invention;

6 is a flowchart illustrating a method of manufacturing a brush card for a DC motor according to a third embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

117: brush holder 121: brush plate

301: hole for fixing the brush holder 401: through hole

403: first plate 405: second plate

407: separation plan 601: insert molding step

602: mold 603: plate separation step

604: resin

The present invention relates to a method of manufacturing a brush plate and a brush card for a direct current motor. More specifically, the brush plate and the inside of the mold are disposed inside the mold for insert molding the brush plate and the brush card, which are easy to place inside the mold by forming the first plate and the second plate integrally through the separation scheduled portion. The present invention relates to a method of manufacturing a brush card more easily by adopting a method of cutting a brush plate after injecting a resin into the brush plate and the brush card so as to be integrally formed.

In general, an electric power assisted steering device of a vehicle detects a torque applied to a steering wheel and outputs an electric signal proportional to the detected torque, and an electronic device that generates a control signal based on an electric signal transmitted from the torque sensor. An electronic control unit (ECU) and a motor for generating an auxiliary power based on a control signal transmitted from the electronic control device are included. Usually, a DC motor is used as the motor.

1 is a cross-sectional view of a DC motor according to the prior art, FIG. 2 is a cross-sectional view in the A-A 'direction of FIG. 1, and FIG. 3 is a cross-sectional view in the B-B' direction of FIG.

 As shown in FIGS. 1 to 3, the DC motor according to the prior art includes a motor housing 101 made of metal, a plurality of magnets 103 formed on an inner circumferential surface of the motor housing 101, and a magnet 103. The armature (Armature) 105 is provided to be rotatable inside the radial direction of the, and the thrust bearing 109 and the radial bearing 111 for supporting the rotation shaft 107 of the armature 105 to be rotatable.

Further, a commutator 113 is provided at one end of the armature 105, and a brush 115 is circumscribed to the commutator 113.

The brush 115 is supported by a brush support member (not shown) under pressure in the direction of the outer circumferential surface of the commutator 113 and provided to be slidable inside the brush holder 117. The brush 115 is made of a carbon material having electrical conductivity to supply a current to the commutator 113. In addition, the brush 115 is connected to the brush plate 121 through the connection wire 203 receives a current.

Brush card 119 is made of a resin (Resin) having a disk shape having a rotating shaft through-hole 201 in the center and insulating. Since the brush holder fixing hole 301 having a predetermined interval is formed in the circumferential direction of the brush card 119, the brush holder 117 is formed on the upper surface of the brush card 119 through the brush holder fixing hole 301. Is mounted. In addition, a brush plate 121 of a metal material is embedded inside the brush card 119, and a current supply line 123 is connected to one side of the brush plate 121 to supply current to the brush 115.

In the DC motor according to the prior art having such a configuration, the two brush plates 121 are insert molded into the brush card 119 while being spaced apart from each other. Insert molding is a process of placing the brush plate 121 in the mold and then injecting resin into the mold. According to the related art, when the brush plate 121 is disposed in the mold, the two brush plates 121 are disposed. Care must be taken not to contact each other, so there is a problem that the process is delayed.

In addition, according to the prior art, the brush holder fixing hole 301 is formed in the brush card 119. When the brush holder 117 made of metal contacts the brush 115 through which electric current flows, heat is generated. There is a problem that the brush card 119 made of resin causes thermal deformation.

Therefore, the present invention has been invented to solve the above problems, and by adopting a method of cutting the brush plate after insert molding so that the brush plate and the brush card is integrally formed to speed up the assembly process of the brush card. There is a main purpose.

In addition, the present invention has been invented to solve the above problems, the main purpose is to prevent the thermal deformation of the brush card by forming a brush holder fixing hole in the brush plate.

In order to achieve the above object, the present invention is provided with a through hole having a predetermined size in the center, and having a first plate and a second plate formed radially around the through hole, wherein the first plate and the second plate The first plate is provided with a brush holder fixing hole coupled with the brush holder to prevent thermal deformation of the molding part during molding, and the first plate and the second plate are cut after the molding to enable insulation. And a second plate is integrally formed via the separation scheduled portion.

In addition, in order to achieve the above object, the present invention is provided with a through hole having a predetermined size in the center, and provided with a first plate and a second plate formed radially around the through hole, the first plate and the first In the second plate, a brush holder fixing hole is formed to be coupled with the brush holder to prevent thermal deformation of the molding part during molding, and the first plate and the second plate are cut after the molding to enable insulation. The first plate and the second plate are integrally formed with a brush plate for a DC motor, which is integrally formed through the separation scheduled portion, and after the molding, the first and second plates are separated and built by cutting the separation scheduled portion. Provided is a brush card for a direct-current motor.

In addition, in order to achieve the above object, the present invention, in the manufacturing method of the brush card for DC motor, the first plate and the second plate via the separation scheduled portion in the mold for insert molding so that the brush plate is embedded in the brush card. An insert molding step of arranging a brush plate having an integrally formed shape, and injecting resin into the mold to integrally form the brush plate and a brush card; And a plate separation step of cutting the separation scheduled part so that the brush plate is separated into a first plate and a second plate to be embedded after the insert molding step is completed. To provide.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

4 is a cross-sectional view of the brush plate according to the first embodiment of the present invention.

As shown in FIG. 4, the brush plate according to the first embodiment of the present invention includes a through hole 401 having a predetermined size in a center thereof, and is radially formed around the through hole 401. 403 and a second plate 405, the first plate 403 and the second plate 405 are integrally formed via the separation scheduled portion 407.

The through hole 401 is formed in the center of the brush plate, the diameter of the through hole 401 may vary and the rotating shaft of the motor penetrates after the brush plate is embedded in the brush card to be described later.

The first plate 403 and the second plate 405 form a body of the brush plate and are for supplying current to each brush (not shown), and are made of a metal material having high electrical conductivity.

A brush holder fixing hole 301 is formed in the first plate 403 and the second plate 405 so that the brush holder (not shown) is directly fixed to the brush plate rather than the brush card (not shown). Accordingly, the problem of the prior art, in which a metal brush holder (not shown) is fixed to a brush card (not shown) made of a resin material, causes thermal deformation of the brush card (not shown).

Meanwhile, the first plate 403 and the second plate 405 are connected to each other by the separation plan part 407. Since the first plate 403 and the second plate 405 are supplied to different brushes (not shown), they must be in an electrically insulated state. After the brush plate of the present invention is completed, the separation scheduled portion 407 should be punched to separate the first plate 403 and the second plate 405 from each other.

However, in the step of insert molding the brush plate 121 to the brush card, since the first plate 403 and the second plate 405 are integrally formed with each other to form one brush plate 121, one brush Only the plate 121 needs to be insert molded.

Therefore, the problem of the prior art, in which two brush plates separated from each other have to be carefully placed so that the two brush plates do not come into contact with each other, is solved as described above. .

5 is a partial cutaway sectional view of a brush card for a direct-current motor according to a second embodiment of the present invention.

As shown in FIG. 5, the brush card for a direct-current motor according to the second embodiment of the present invention has a disc shape having a rotating shaft through hole 201 at the center thereof, and a brush extending from the inner brush plate 121 at the surface thereof. The holder fixing hole 301 is formed.

In addition, since the separation plan part (not shown) was cut | disconnected in the brush plate 121 inside, the 1st plate 403 and the 2nd plate 405 are in an electrically insulated state with each other. The current supply line 123 is connected to one side of the brush plate 121 to supply current to the brush (not shown).

6 is a flowchart illustrating a method of manufacturing a brush card for a DC motor according to a third embodiment of the present invention.

As shown in FIG. 6, the method for manufacturing a brush card for a direct-current motor according to the third embodiment of the present invention includes an insert molding step 601 and a plate separating step 603.

In the insert molding step 601, the brush plate 121 is placed inside the mold 602 for insert molding the brush card, and the resin 604 is injected into the mold 602 to insert the brush plate 121 and the brush. The card is integrally formed.

The brush plate 121 used herein includes a first plate 403 and a second plate 405 as mentioned in the first embodiment of the present invention, wherein the first plate and the second plate 405 are separated. It is formed integrally via the predetermined part 407.

On the other hand, when the insert molding step 601 is completed, the brush plate 121 is to be embedded in the brush card, the step of forming a brush holder fixing hole on the surface of the brush plate 121 or the separation scheduled portion 407 to the outside The exposing step may further be included. In addition, the steps of forming the brush holder fixing hole and exposing the separation plan part 407 to the outside may be changed.

The plate separating step 603 is a step of cutting the brush plate 121 and dividing the first plate 403 and the second plate 405 after the insert molding step 601 is completed. That is, the punching separation part 407 connecting the first plate 403 and the second plate 405 is punched to make the first plate 403 and the second plate 405 electrically insulated from each other. Step.

According to the manufacturing method of the brush card for a DC motor according to the third embodiment of the present invention having such a configuration, in the insert molding step, the process is delayed by paying attention not to contact the two separated brush plates. The problem of the technology is solved.

The above description is merely illustrative of the present invention, and those skilled in the art will appreciate that various modifications and variations can be made without departing from the essential features of the present invention. Accordingly, the embodiments disclosed herein are not intended to limit the present invention but to describe the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

As described above, according to the present invention, by adopting a method of cutting the brush plate after insert molding so that the brush plate and the brush card are integrally formed, there is an effect of speeding up the brush card assembly process.

Further, according to the present invention, there is an effect of preventing thermal deformation of the brush card by forming the brush holder fixing hole in the brush plate.

Claims (5)

It is provided with a through hole of a predetermined size in the center, and provided with a first plate and a second plate formed radially around the through hole, In the first plate and the second plate, a brush holder fixing hole coupled with the brush holder is formed to prevent thermal deformation of the molding part during molding. The brush plate for the DC motor, characterized in that the first plate and the second plate are integrally formed through the separation scheduled portion so that the first plate and the second plate can be insulated after molding. A through hole having a predetermined size is provided at a center thereof, and a first plate and a second plate are formed radially around the through hole, and the first plate and the second plate have thermal deformation of a molding part during molding. A brush holder fixing hole is formed to be coupled to the brush holder, and the first plate and the second plate are separated from each other through the separation scheduled portion so that the first plate and the second plate can be insulated after molding. A brush card for a DC motor, which is integrally formed with a brush plate for a DC motor, wherein the first plate and the second plate are separated and built by cutting the separation scheduled part after molding. In the manufacturing method of the brush card for DC motors, Inside the mold for insert molding so that the brush plate is embedded in the brush card, a brush plate in which the first plate and the second plate are integrally formed through a separation scheduled portion is disposed, and resin is injected into the mold to form the brush plate. And an insert molding step of integrally forming the brush card. And After the insert molding step is completed, the separation plate to cut the separation part to be separated into the first plate and the second plate plate embedded step Method for producing a brush card for a direct-current motor comprising a. The method of claim 3, wherein After the insert molding step further comprises the step of exposing the separation scheduled portion to the outside of the brush card manufacturing method of a brush card for a DC motor. The method of claim 4, wherein The plate separating step is a manufacturing method of a brush card for a DC motor, characterized in that for punching (Punching) the separation scheduled portion.

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