KR20110001374A - Electric motor with the one piece type brush holder - Google Patents

Abstract

PURPOSE: An electric motor including an integrated type brush holder is provided to have improved production capabilities by reducing the number of components required for the brush holder. CONSTITUTION: Through holes(211, 212) are formed at the bottom part of a cartridge housing(200). An upper guiding groove(220) is formed at the upper side of the cartridge housing. A brush holder is inserted into the upper guiding groove. A lower guiding groove is formed at the lower side of the cartridge housing. A lower expanding plate(150) is inserted through the through holes of the bottom part of the cartridge housing.

Description

ELECTRIC MOTOR WITH THE ONE PIECE TYPE BRUSH HOLDER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush-type electric motor, and more particularly, to an electric motor having an integrated brush holder in which a brush holder accommodating a brush is formed in a single body to reduce the number of parts and simplify the assembly process.

As shown in FIGS. 1 and 2, the brush-type permanent magnet motor includes a yoke assembly 10 having a permanent magnet 12 disposed inside the yoke 11 and a core of the rotating shaft 21. An armature coil (not shown) is wound on the arm 22 and an armature assembly 20 in which a commutator 24 is press-fitted to the tip thereof. After arranging the armature assembly 20, which is the rotor, while keeping the air gap inside the permanent magnet 12 of the yoke assembly 10, which is the stator, and applying a current to the armature coil, an electromagnetic force between the armature coil and the permanent magnet 12 This occurs and the armature assembly 20 is rotated to obtain power by Fleming's left hand law.

In addition, a brush cartridge assembly 30 for feeding the armature coil is provided. The brush cartridge assembly 30 includes a brush 31 in sliding contact with the outer circumference of the commutator 24, a brush holder 50 in which the brush 31 is housed, and a lead wire for feeding the brush 31. 60 is installed. The cover 70 is installed in front of the brush cartridge assembly 30.

3 shows the inner portion of a conventional brush cartridge assembly 30 in detail.

As shown in FIG. 3, in the conventional brush cartridge assembly 30, the brush holder 50 is assembled to the cartridge housing 40 made of plastic injection molding, and the brush 31 is accommodated in the brush holder 50. In the form of The brush 31 is electrically connected to the connector of the lead wire 60 by a pigtail wire 32.

However, since the brush holder 50 is divided into two parts, the upper casing 50a and the lower casing 50b, an unnecessary cost and time are required for parts management and procurement by increasing the number of parts. In addition, since the shape and structure of the upper casing 50a and the lower casing 50b are complicated, manufacturing costs are high, and at the same time, there is a closed end that the assembly process becomes complicated.

Specifically, in the upper casing 50a of the brush holder 50, the fixing leg 52a extends downward from the lower ends of both side plates 51a, and the insertion leg 53a is provided in the front and rear directions of both side plates 51a. ) Extends downward, and the support leg 54a extends outwardly between the fixing leg 52a and the insertion leg 53a. In addition, the lower casing 50b of the brush holder 50 has a blocking plate 52b extended upwardly at the rear of the bottom plate 51b, and insertion grooves 53b are formed at both front and rear sides of the bottom plate 51b, and the bottom thereof. Open grooves 54b are formed on both sides of the plate 51b. In addition, the cartridge housing 40 has a structure in which a through hole 41 is formed.

The conventional brush cartridge assembly 30 lowers the fixing leg 52a and the insertion leg 53a of the upper casing 50a while the lower casing 50b is positioned below the upper casing 50a. Only the upper casing 50a and the lower casing 50b are aligned through the complicated process of fitting the opening groove 54b and the insertion groove 53b of the casing 50b, so that the insertion leg 53a and the insertion groove 53b are aligned. Position is aligned by the bottom plate 51b and the blocking plate 52b of the lower casing 50b, and only the front (the direction toward the central axis of the cartridge assembly) of the upper casing 50a is opened. It is prevented, and the support leg 54a of the upper casing 50a is mounted on the upper surface of the lower casing 50b, so that the stability is maintained.

In addition, the upper and lower casings 50a and 50b are mounted on the inner surface of the cartridge housing 40 and the fixing leg 52a of the upper casing 50a is inserted into the through hole 41 of the cartridge housing 40. do. Then, as shown in FIG. 4, the fixing leg 52a of the upper casing 50a passes through the through hole 41 of the cartridge housing 40 and protrudes to the rear side. In this state, when the fixing leg 52a is bent inward, the assembly of the brush holder 50 is completed.

As such, in the conventional brush cartridge assembly, the brush holder 50 is divided into two structurally complex casings 50a and 50b, and the two casings 50a and 50b must be assembled through a complicated process. Due to the large number of parts, management costs and manufacturing costs are high, and the assembly process is complicated.

The present invention has been made to solve the above problems, by simplifying the structure of the brush holder to reduce the number of parts and assembly structure for the cartridge housing to reduce the cost and improve the productivity of the electric motor having an integrated brush holder The purpose is to provide a motor.

The object of the present invention described above is to supply a yoke assembly in which a permanent magnet is disposed inside the yoke, a rotation shaft around which the armature coil is wound and disposed inside the yoke assembly, a commutator press-fitted to the rotation shaft, and an armature coil. An electric motor comprising a brush for holding and a brush holder for housing the brush and assembled in a cartridge housing, wherein the brush holder has a single body having an upper plate, both side plates, a back plate, and a lower plate leaving an opening for inserting the brush. It consists of a structure in which the two downward extension plate is extended downward downward in a single body to the bottom of the lower plate, the upper plate, both side plates, the back plate, the lower plate and the two downward extension plate, each one or more adjacent plates Continuously bent from to form a body as a whole; The cartridge housing is achieved by providing an electric motor having a structure in which two through holes for passing two downwardly extending plates of the brush holder at the bottom thereof are formed.

In the above-described electric motor of the present invention, the downwardly extending plate of the brush holder is formed to be bent downward at the front and rear ends of the lower plate to extend; The through hole of the cartridge housing may include a first through hole formed by drilling a hole through which a downwardly extending plate on the rear side of the brush holder passes through a radially outer side of the cartridge housing, and a front side of the brush holder within the radial direction of the cartridge housing. The front surface through which the downward extension plate may pass may be formed as a second through hole of an open shape.

In the electric motor of the present invention, the side plate of the brush holder is composed of the left side plate and the right side plate bent downward from the left and right sides of the top plate; The lower plate is divided into a left lower plate which is bent and extended from the left side plate, and a right lower plate which is bent and extended from the right side plate. It is preferable to configure in the form divided into the right downward extension plate which is bent and extended.

In the above-described electric motor of the present invention, the upper surface of the cartridge housing to guide the mounting of the brush holder to form an upper guide groove for fitting the brush holder; The lower surface of the cartridge housing, it is preferable to form a lower guide groove for bending the downward extension plate of the brush holder protruding to the lower surface of the cartridge housing.

The electric motor according to the present invention has a simple structure even though the brush holder is composed of a single body, and implements a simple assembly structure by simply bending the downward extension plate of the brush holder into the through hole of the cartridge housing. Therefore, according to the electric motor of the present invention, the number of parts of the brush holder is reduced, cost reduction, parts management and procurement are smooth, and the productivity of the motor is improved.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

5 to 9 show a brush cartridge housing and a brush holder according to the present invention. FIG. 5 is an overall perspective view, FIG. 6 is a perspective view of only the brush holder viewed from different directions, and FIG. 7 is a perspective view from the bottom of FIG. 5. 8 is a cross-sectional view taken along the line AA of FIG. 5, and FIG. 9 is a cross-sectional view taken along the line BB of FIG. 5. Directional indications indicated by arrows in FIGS. 5 to 9 are set to facilitate understanding of the present invention, but are not directions in actual motors. The following description and claims are based on the directions shown in the drawings.

First, as shown in Figs. 5 and 6, the brush holder 100 according to the present invention, the upper plate 110, both side plates (left) leaving an opening 101 for inserting the brush 31 in the front ( 120, the back plate 130 and the lower plate 140 is made of a single body, the two downward extension plate 150 is formed of a structure extending downward in a single body below the lower plate 140. The top plate 110 is formed with a through hole 111 through which a pigtail wire 32 passes. As a result, the brush holder 100 is made of a single structure as a whole, it is a structure that only needs to be coupled to the cartridge housing 200.

In order to configure the brush holder 100 as a unit, each of the top plate 110, both side plates 120, the back plate 130, the bottom plate 140, and the two downwardly extending plates 150 may be adjacent to each other. It shall be bent and extended from the above plates to form a single unit as a whole.

The downward extension plate 150 of the brush holder 100 according to the present invention is bent at the front and rear ends of the lower plate 140 to extend downward. However, the downward extension plate 150 may be formed in the form of a downward extension plate 151 extending from both side plates 120 of the brush holder 100, as indicated by dashed lines in FIG. 5. In this case, the downwardly extending plate 150 is parallel to the side plate 120 on the left and right sides of the brush holder 100. In addition, the downward extension plate 150 on the rear side may be formed in a form in which the back plate 130 extends further downward than the lower plate 140, rather than being bent and extended from the lower plate 140.

The brush holder 100 according to the present embodiment may be manufactured by a method of bending a metal flat plate in a press and then bending the metal plate into a shape that can accommodate the brush 31.

As shown in FIGS. 5 and 7, the cartridge housing 200 is formed of a plastic injection product, and has a form in which the brush holder 100 described above is stably and easily fixed.

As shown in FIG. 5, the cartridge housing 200 according to the present invention includes a through hole 211 and 212 through which a downward extension plate 150 of the brush holder 100 penetrates a bottom portion 210 thereof. Is formed. The through holes 211 and 212 may be formed of a through hole 211 in which a hole is formed in the bottom portion 210 of the cartridge housing 200, and a through hole 212 in which one side is opened. It may be made of. In the present embodiment, the first through hole 211 in the form of a hole is formed on the rear extension plate 150 of the rear side (radial outer side of the cartridge housing) of the brush holder 100, and the front side (radial inner side of the cartridge housing). The bottom extension plate 150 has a configuration in which a second through hole 212 is formed in which an opening front face is opened. Opening through-hole 212 is easy to form or process.

In addition, the upper guide groove 220 for guiding the mounting of the brush holder 50 is formed on the upper surface of the cartridge housing 200. The brush holder 50 is fitted into the upper guide groove 220, and both left and right sides of the brush holder 50 are fitted into the guide groove 220 to be stably seated. The upper guide groove 220 is formed in the radial direction on the upper surface of the cartridge housing 200 while being formed in the upper and lower directions on the radially outer side. The upper guide groove 220 may be formed in the radial direction only on the upper surface of the cartridge housing 200, may be formed in the up, down direction only in the radially outer side, both as shown in the embodiment shown in the drawings You may form.

As shown in FIG. 7, a lower guide groove 230 for fitting the downward extension plate 150 of the brush holder 100 is formed in the lower surface of the cartridge housing 200. When the sheet is bent in a direction facing the downward extension plate 150 of the brush holder 100 protruding downward through the through holes 211 and 212 of the cartridge housing 200, the downward extension plate 150 is guided downward. It fits in the groove 230.

The present invention made as described above, while the brush holder 100 is composed of a single unit, but a simple structure, while the downward extension plate 150 of the brush holder 100 through holes 211, 212 of the cartridge housing 200 It is composed of a simple assembly structure that is simply inserted into and bent.

That is, as shown in FIG. 5, the brush holder 100 of the unit is taken, and the front and rear downward extension plates 150 of the brush holder 100 are passed through the holes 211 and 212 of the cartridge housing 200. When inserted into each, the downward extension plate 150 of the brush holder 100 passes through the bottom portion 210 of the cartridge housing 200 to protrude to the lower surface of the cartridge housing 200.

In this state, as shown in FIGS. 7 and 8, when the protruding portion of the downwardly extending plate 150 is bent and folded inwardly (in the opposite direction), the downwardly extending plate 150 surrounds the cartridge housing 200. It becomes the form, and fixing is completed simply.

In addition, the brush holder 100, as shown in Figures 5, 8 and 9, to maintain a state that is stably fitted in the upper guide groove 220 formed on the upper surface of the cartridge housing 200.

Similarly, as shown in FIGS. 5, 7 and 9, the downwardly extending plate 150 of the brush holder 100 is stably fitted in the lower guide groove 230 formed on the lower surface of the cartridge housing 200. Done.

The brush 31 (see FIG. 5) is assembled by assembling the brush holder 100 into the cartridge housing 200 as described above and then inserting the brush holder 100 through the front opening 101 of the brush holder 100.

10 to 12 show another embodiment of the brush holder of the present invention, a perspective view is shown in FIGS. 10 and 11, and a development view is shown in FIG. 12. This is an embodiment of a brush holder 100a of a type suitable for molding (punching and bending) in a press die. The same parts as those in the embodiment shown in Figs. 5 to 9 are given the same reference numerals.

10 and 11, the brush holder 100 according to the present embodiment, the lower plate 140 and the downward extension plate 150 is formed in a divided (divided) in both left and right.

That is, the lower plate 140 is divided into a left lower plate 141 and a right lower plate 142, and the downward extension plate 150 is divided into a left downward extension plate 151 and a right downward extension plate 152.

And the side plate 120 is composed of the left side plate 121 and the right side plate 122 bent downward from the left and right sides of the top plate 110, the back plate 130 is bent downward from the top plate 110. And separated from the side plate 120 (cut off).

As such, when the lower plate 140 and the downward extension plate 150 are divided to the left and right, a single brush holder 100 can be easily manufactured by punching and bending one plate.

12 is a developed view of such a brush holder 100a. After the plate is punched in the shape of FIG. 12 in the press die, the side plates 121 and 122 portions of both sides are bent based on the first bending line 301, and then again based on the second bending line 302. The lower plate 141, 142 and the downwardly extending plate 150 are bent, and then the downwardly extending plate 150 is bent based on the third bending line 303, and the rear surface is bent based on the fourth bending line 304. When the plate 130 is bent, the brush housing 100a of a single body can be easily manufactured.

As described above, in the electric motor according to the present invention, the brush holder housing is made of a simple unitary structure, and the assembly structure for the cartridge housing is also simplified.

Therefore, applying the present invention reduces the cost of the electric motor and implements an excellent electric motor with improved productivity.

In the above, specific embodiments of the present invention shown in the accompanying drawings have been described in detail, but these are merely illustrative of the preferred embodiments of the present invention, and the scope of protection of the present invention is not limited thereto. In addition, the embodiments of the present invention as described above can be variously modified and equivalent other embodiments by those of ordinary skill in the art within the technical spirit of the present invention, such modifications and equivalent other embodiments are It belongs to the appended claims of the invention.

1 is a cross-sectional view showing an example of a general electric motor.

FIG. 2 is a perspective view showing the appearance of FIG. 1. FIG.

3 is a perspective view showing an inner structure and a brush holder of a conventional brush cartridge assembly.

4 is a perspective view showing the outer side of a conventional brush cartridge assembly.

5 is a perspective view showing the structure of a brush cartridge housing and a brush holder according to the present invention.

6 is a perspective view of only the brush holder of FIG. 5 viewed from another direction.

FIG. 7 is a perspective view of the lower portion of FIG. 5.

8 is a cross-sectional view taken along the line A-A of FIG.

9 is a cross-sectional view taken along line B-B of FIG. 5.

10 is a perspective view showing another embodiment of the brush holder of the present invention.

FIG. 11 is a perspective view of FIG. 10 viewed from another direction.

12 is an exploded view of the brush holder of FIG. 10.

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

10: yoke assembly 11: yoke

12: permanent magnet 20: amateur assembly

21: shaft 22: core

24: commutator 31: brush

32: pigtail wire 60: lead wire

100: brush holder 101: opening

110: upper plate 111: through hole

120: side plate 121: left side plate

122: right side plate 130: back plate

140: lower plate 141: left lower plate

142: lower right plate 150: downward extension plate

151: left downward extension plate 152: right downward extension plate

200: cartridge housing 210: bottom

211: first through hole 212: second through hole

220: upper guide groove 230: lower guide groove

Claims (4)

A yoke assembly having a permanent magnet disposed inside the yoke, a rotating shaft wound with an armature coil disposed inside the yoke assembly, a commutator pressed into the rotating shaft, a brush for feeding the armature coil, and a brush An electric motor including a brush holder that is accommodated and assembled to a cartridge housing, The brush holder 100, the upper plate 110, both side plates 120, the back plate 130, the lower plate 140 is made of a single body, leaving the opening 101 for inserting the brush, the lower plate Two downwardly extending plates 150 downward of the 140 are formed in a unitary structure extending downwardly, wherein the top plate 110, both side plates 120, the back plate 130, the bottom plate 140 and Each of the two downwardly extending plates 150 is continuously extended from one or more adjacent plates to form one body as a whole. The cartridge housing (200) is an electric motor, characterized in that two through holes are formed in the bottom portion 210 through which two downwardly extending plates (150) of the brush holder (100) pass. The method of claim 1, The downward extension plate 150 of the brush holder 100 is formed in a form bent downwardly extended at the front, rear end of the lower plate 140, The through hole of the cartridge housing 200 has a first through hole formed by drilling a hole through which the downwardly extending plate 150 at the rear side of the brush holder 100 passes through the radially outer side of the cartridge housing 200. 211 and a second through hole 212 having a shape in which the front surface through which the downwardly extending plate 150 on the front side of the brush holder 100 passes is radially inward of the cartridge housing 200. Electric motor. The method of claim 1, The side plate 120 of the brush holder is composed of a left side plate 121 and a right side plate 122 bent downward from both left and right sides of the top plate 110, The lower plate 140 is divided into a left lower plate 141 extending from a left side plate 121 and a right lower plate 142 extending from a right side plate 122. The downward extension plate 150 is formed in a divided form into a left downward extension plate 151 extending from the left lower plate 141 and a right downward extension plate 152 extending from the right lower plate 142. An electric motor characterized by the above-mentioned. The method of claim 1, An upper guide groove 220 is formed on the upper surface of the cartridge housing 200 to guide the mounting of the brush holder 50 to which the brush holder 50 is fitted. On the lower surface of the cartridge housing 200, a lower guide groove 230 for bending and fitting the downward extension plate 150 of the brush holder 100 protruding to the lower surface of the cartridge housing 200 is formed Electric motor.

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