JP2002142401A - Manufacturing method for motor part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for motor parts that allows reduction in the scale of the manufacturing facilities therefor and thus capable of reducing the manufacturing cost thereof. SOLUTION: A supporting boss 28 is formed out of brush holder molding resin injected through resin injection holes 19 formed around the boss portion 8 of an end frame body 5. More specifically, when 'out-sert' molding is performed with the end frame body 5 with the resin injection holes 19 formed therein, an brush holder and the supporting boss 28 are simultaneously formed out of the brush holder molding resin injected through the resin injection holes 19. When 'out-sert' molding is performed with the end frame body 5 with no resin injection holes 19 formed therein, brush holder molding resin is not injected because of absence of the resin injection holes 19, and thus an end frame 4 without a supporting boss 28 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a motor component.

[0002]

2. Description of the Related Art Conventionally, an end frame of a motor is fitted into one side opening of a bottomed cylindrical core, accommodates an armature together with the core, and extends cylindrically from an outer surface thereof. It has a boss in which a bearing for rotatably supporting the rotating shaft of the armature is fitted. The end frame is provided with a brush holder. In general, the end frame main body is formed by deep drawing of an iron plate, and the brush holder is formed of a synthetic resin since insulation properties are required. As one method of manufacturing such an end frame, there is a method of outsert molding a brush holder made of a synthetic resin on an iron plate end frame main body.

[0003]

However, in the above-mentioned motor, the boss portion may be used as it is as a support portion (attachment portion) of the motor, or may be combined with the boss portion depending on the restriction of the motor attachment portion for each user. There are two types of cases where a support portion (attachment portion) of a predetermined shape made of resin is integrally connected or integrally formed and the motor is supported by the support portion. Conventionally, these are manufactured on separate manufacturing lines. I was trying to do it. Therefore, there is a problem that the equipment becomes large-scale and the manufacturing cost increases.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for manufacturing a motor component capable of reducing the scale of equipment and reducing the manufacturing cost. It is in.

[0005]

According to the first aspect of the present invention, a brush holder is formed by outsert molding with a molding resin made of an insulating material on an end frame body having a boss portion forming a bearing housing portion. A method of manufacturing a motor component, wherein a resin introduction hole is formed on an outer surface around a boss portion of the end frame main body, and at the time of outsert molding,
A supporting boss is formed on the outer peripheral surface of the boss portion through the resin introduction hole using a resin for forming a brush holder.

According to a second aspect of the present invention, in the method for manufacturing a motor component according to the first aspect, a plurality of the end frame bodies are continuously formed on the hoop material by drawing. The brush holder is formed by outsert molding with respect to the end frame body before separation.

(Operation) According to the first aspect of the present invention,
The support boss is formed of a brush holder molding resin introduced through a resin introduction hole formed around the boss portion of the end frame body. That is, when the end frame main body in which the resin introduction hole is formed is outsert molded, the brush holder and the support boss are formed simultaneously with the brush holder by the brush holder molding resin introduced through the resin introduction hole. on the other hand,
When outsert molding is performed on an end frame body having no resin introduction hole in the end frame body, the brush holder molding resin is not introduced because there is no resin introduction hole, and an end frame without a supporting boss is formed. That is, an end frame having a supporting boss and an end frame having no supporting boss can be formed by one mold. As a result, it is possible to manufacture on the same manufacturing line, so that the scale of the equipment can be reduced and the manufacturing cost can be reduced.

According to the second aspect of the present invention, a plurality of end frame bodies are continuously formed on the hoop material by drawing, and the brush holder is out of the end frame body before being cut off. It is formed by sert molding. Therefore, compared to the case where the brush holder is outsert molded after the end frame main body is separated, the positioning of the end frame main body at the time of the molding is easier, thereby shortening the manufacturing time and reducing the number of manufacturing steps. Can be. In addition, since the brush holder can be formed for a plurality of end frame bodies at once, the manufacturing time and the number of manufacturing steps can be further reduced, and the manufacturing cost can be reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an external perspective view of a small DC motor. In FIG. 1, a motor 1
The motor housing 2 is composed of a yoke housing 3 and an end frame 4, and an armature is rotatably accommodated in a space formed by the yoke housing 3 and the end frame 4.

The end frame 4 has a cup shape as a whole, and as shown in FIG. 2, comprises an iron end frame body 5 and a brush holder 6 made of a synthetic resin made of an electrically insulating material. The end frame body 5 is, as shown in FIG.
A tubular boss 8 is formed at the center of the outer surface 7. As shown in FIG. 1, the boss portion 8 is provided with a bearing 10 for supporting the rotating shaft 9 of the armature inside the boss portion 8.

The end frame body 5 has a semi-cup shape in which one side is cut out to form a notch 11, and a bent piece 12 extends from a central portion of a notch edge 11a of the notch 11. Is formed. The bent piece 12 has a triangular base 13 and a tip 14 extending from the tip of the base 13. The base 13 of the bent piece 12 is formed to extend so as to be flush with the outer side surface 7. The distal end 14 of the bent piece 12 is bent downward from the base 13. In addition, cuts 15 are formed on both sides of the cut edge 11a of the cut portion 11, respectively. The cut 15 forms a rectangular space. The entrance of the cut 15
A projecting portion 16 is formed to extend so as to narrow the space.

Outer side surface 7 of protrusion 16 and its surrounding portion
Is recessed to form a first recess 17. In addition, the outer side surface 7 on the outer peripheral edge portion of the cut 15 on the side opposite to the first concave portion 17 is also concavely formed to form the second concave portion 18. Therefore, in FIG. 3 and FIG.
The surfaces of the second concave portions 17 and 18 are one step lower than the outer surface 7.

A resin introduction hole 19 is formed through the outer surface 7 of the end frame body 5 at a position opposite to the boss 8. Also, a pair of resin introduction holes 1
A jig insertion hole 20 is formed at a position adjacent to 9.

Next, the brush holder 6 formed on the end frame main body 5 will be described. The brush holder 6
It is formed on the notch 11 side of the end frame body 5. The base end of the brush holder 6 has the notch 1
A side wall 21 is formed to extend forward from the notch edge 11a and then extend downward. The bent piece 12 extending from the notch 11 is provided inside the side wall 21. At this time, as shown in FIG. 8, the side wall portion 21 includes a distal end portion 14 bent downward from the base portion 13 of the bent piece 12. The side wall portion 21 is formed such that its upper side surface 22 is flush with the outer side surface 7 of the end frame main body 5.

An upper wall portion 23 is formed on both upper side portions of the side wall portion 21 so as to extend to the cut 15 side. The outside of the upper wall 23 closes the cut 15 and embeds the first and second recesses 17 and 18, and the outer surface 24 of the upper wall 23 is flush with the outer surface 7 of the end frame body 5. It is formed to become. The inside of the upper wall portion 23 cooperates with a buried portion in which the first and second concave portions 17 and 18 are buried, around the cut 15 and the projecting portion 16.
Is to be sandwiched. Therefore, the connection of the brush holder 6 having the side wall portion 21 and the upper wall portion 23 to the end frame main body 5 in the up-down direction and the front-rear direction at the central portion becomes strong due to the presence of the bent pieces 12. The connection in both the vertical direction and the front-rear direction with respect to the end frame main body 5 on both sides of the brush holder 6 is performed by enclosing the embedded portion in which the first and second concave portions 17 and 18 are embedded, the cut 15 and the projection 16. Makes it stronger.

As shown in FIG. 6, a terminal accommodating portion 25 is formed between the inside of the upper wall portion 23 and the inside of the side wall portion 21. The terminal accommodating portion 25 accommodates a terminal integrally formed with a brush spring for holding a brush. In the terminal accommodating portion 25, a male terminal through hole 26 penetrating the upper wall portion 23 and a female terminal through hole 27 penetrating the side wall portion 21 are formed.

A support boss 28 is formed on the outer periphery of the boss 8 of the end frame body 5. The support boss 28 is formed due to the restriction of the mounting position of the motor 1, and is formed in the present embodiment in order to enlarge the outer shape of the boss portion 8 to facilitate the support. In the present embodiment, the support boss 28 is formed of the same material as the brush holder 6, and is formed simultaneously when the brush holder 6 is formed. That is, the support boss 28 is connected to the brush holder 6 through the resin introduction hole 19 as shown in FIGS.
When the brush holder 6 is formed by outsert molding described later, the resin is fed through the resin introduction hole 19 to form the support boss 28. Therefore, in this case, since the brush holder 6 is connected to the supporting boss 28 via the resin introduction hole 19, the brush holder 6 is more strongly connected to the end frame main body 5.

Next, a method of manufacturing the end frame 4 will be described. In FIG. 15, a hoop member 31 is a strip-shaped iron plate member, and a plurality of end frame bodies 5 and yoke housings 3 are formed at regular intervals in the longitudinal direction. The plurality of end frame bodies 5 and the yoke housing 3 formed on the hoop material 31 are formed by deep drawing by a press machine. Then, the one hoop material 31 is transferred to an outsert molding process for forming the brush holder 6 on the end frame body 5 formed on the hoop material 31.

The outsert molding is performed on each end frame body 5 formed on the hoop material 31, and a mold for that purpose is prepared. FIG. 17 shows that the mold is
1 shows a cross section of a main part of a mold cut in a longitudinal direction of FIG.
Reference numeral 8 denotes a main part front section of the mold, which crosses the mold in a direction perpendicular to the longitudinal direction of the hoop material 31.

The mold 32 includes a lower mold 33 and an upper mold 34. The lower mold 33 is disposed below the hoop material 31 and has a convex portion 35 for supporting the end frame body 5. The lower mold 33 includes the side wall portion 21, the upper wall portion 23,
A concave portion 36 for forming the brush holder 6 is formed from the terminal accommodating portion 25 and the like, and the supporting boss 28 is formed from the terminal accommodating portion 25 through the resin introduction hole 19.
A communication passage 37 is formed in order to form.

On the other hand, the upper mold 34 is disposed above the hoop material 31 and has a recess 38 for supporting the end frame body 5. The upper die 34 has a concave portion 39 for forming the brush holder 6 and a concave portion 40 for forming the support boss 28. And the convex part 35, each concave part 36,38,3
The cavities 9 and 40 and the communication passage 37 serve as cavities 41 and 42 when the brush holder 6 and the support boss 28 are formed.

As shown in FIG. 17, the runner 43 formed by the lower mold 33 and the upper mold 34 is formed from the gate 44 to the hoop material 31 so that a part of the hoop material 31 is interposed. . The upper mold 34 has the runner 4
3 is formed, and a resin is injected from the injection device through the introduction path 45.

Therefore, the resin injected through the introduction path 45 is filled into the cavity 41 for forming the brush holder 6 through the runner 43 and the gate 44. As shown in FIG. 18, a part of the resin filled in the cavity 41 is passed through the communication passage 37 and the resin introduction hole 19 to form the support boss 2.
8 is filled in the cavity 42 when molding.

Then, the resin filled in the cavities 41 and 42 is cured. Thereby, as shown in FIG. 16, each end frame main body 5 formed on the hoop material 31 is formed.
Then, the brush holder 6 and the supporting boss 28 are simultaneously outsert molded. At this time, the gate 44 and the runner 4
The connecting body 46 connecting the side wall 21 of the brush holder 6 and the hoop material 31 is formed by the resin cured in the inside 3.

As described above, when the brush holder 6 is formed on each end frame body 5 of the hoop material 31 by outsert molding, the hoop material 31 is transferred to the next assembling process by a transport device such as a transport belt. You will be guided. Then, in the assembling process, assembling parts and the like are assembled to each end frame main body 5 (end frame 4) on which the yoke housing 3 of the hoop material 31 and the brush holder 6 are formed. That is, an armature is attached to each yoke housing 3, and a terminal to which a brush is attached is attached to the end frame 4. Then, the end frame 4 is cut off from the hoop material 31, and the cut end frame 4 is crimped to the yoke housing 3 on the hoop material 31. Finally, the yoke housing 3 is separated from the hoop material 31.
Are cut off to complete the motor 1 shown in FIG.

Further, the end frame 4 can be used when the support boss 28 is not required due to the restriction of the mounting position of the motor 1.
In order to form the (motor 1), when processing a plurality of end frame bodies 5 on the hoop material 31 with a press machine,
The end frame main body 5 in which the resin introduction hole 19 is not formed is processed. In this case, when the brush holder 6 is outsert-molded, since there is no resin introduction hole 19, the support boss 28 is not provided.
No resin is supplied to the cavity 42 for molding
8). Therefore, it is possible to manufacture the end frame 4 which does not require the support boss 28 as shown in FIG. 14 while using the mold 32 for molding the support boss 28 described above.

Next, the features of the embodiment configured as described above will be described below. (1) The mold 32 of the present embodiment is the end frame body 5
The resin is introduced into the cavity 42 of the support boss 28 through the resin introduction hole 19 formed in the above. Therefore, when the end frame main body 5 having the resin introduction hole 19 formed therein is outsert molded, the resin for forming the brush holder 6 is introduced into the cavity 42 of the support boss 28 through the resin introduction hole 19, as shown in FIG. The support boss 28 is formed at the same time as the brush holder 6. On the other hand, when the end frame body 5 having no resin introduction hole 19 in the end frame body 5 is outsert molded, the resin introduction hole 1 is formed.
9, the cavity 42 for molding the supporting boss 28
No resin is supplied to the support boss 2 as shown in FIG.
An end frame 4 without 8 is formed. In other words, in this embodiment, the support boss 2 shown in FIG.
Thus, the end frame 4 having the support 8 and the end frame 4 without the support boss 28 shown in FIG. 14 can be formed.
As a result, it is possible to manufacture on the same manufacturing line, so that the scale of the equipment can be reduced and the manufacturing cost can be reduced. Also, since only one mold 32 is required for both end frames 4, the cost of the mold can be reduced.

(2) In the present embodiment, the brush holder 6 is formed by outsert molding with respect to the plurality of end frame bodies 5 which are continuously formed by drawing on the hoop material 31. Therefore, as compared with the case where the brush holder 6 is outsert molded after the end frame main body 5 is separated, the positioning of the end frame main body 5 at the time of the molding is easier, so that the manufacturing time and the number of manufacturing steps are reduced. Can be achieved. In addition, since the brush holder 6 can be formed on a plurality of end frame bodies 5 at one time, the manufacturing time and the number of manufacturing steps can be further reduced.
Manufacturing costs can be reduced.

(3) In the present embodiment, a bent piece 12 is formed that extends from the notch edge 11a of the notch section 11 of the end frame body 5 and is bent, and the tip end 14 of the bent piece 12 is used as a brush holder. 6 in the side wall 21. Therefore, the connection between the central portion of the brush holder 6 and the end frame body 5 is firmly connected to the vertical and front-rear forces.

(4) In this embodiment, the outside of the upper wall 23 of the brush holder 6 is formed by the cut 1 of the end frame body 5.
5, the first and second recesses 17 and 18 are buried, and the inside of the upper wall 23 cooperates with the buried portion in which the first and second recesses 17 and 18 are buried. 16 was inserted. Therefore, the connection between the both sides of the brush holder 6 and the end frame main body 5 is firmly connected to the vertical and front-rear forces.

(5) In this embodiment, since the brush holder 6 and the support boss 28 are formed integrally through the resin introduction hole 19, the connection between the brush holder 6 and the end frame main body 5 is further strengthened. Linked to

(6) In this embodiment, although the brush holder 6 is formed by outsert molding, the upper surface 22 of the side wall 21 and the outer surface 24 of the upper wall 23 constituting the brush holder 6. Was formed so as to be flush with the outer surface 7 of the end frame body 5. That is, since the brush holder 6 does not protrude outward from the outer surface 7 of the end frame main body 5, the size of the motor 1 can be reduced.

The embodiment of the present invention is not limited to the above embodiment, but may be implemented as follows. In the above embodiment, the yoke housing 3 is formed together with the hoop material 31, but the hoop material 31 may be implemented using a hoop material in which only the end frame main body 5 is formed. In this case, the same effects as those of the above embodiment can be obtained.

The numbers of the yoke housings 3 and the end frame bodies 5 formed on the hoop member 31 of the above embodiment are not particularly limited, and may be changed as appropriate.
Further, the hoop material 31 does not have to have a finite length, and may have a band shape wound in a roll shape.

[0035]

As described in detail above, according to the present invention,
It is possible to provide a method for manufacturing a motor component that can reduce the scale of equipment and reduce the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a motor for describing one embodiment.

FIG. 2 is a perspective view of an end frame.

FIG. 3 is a perspective view of an end frame main body.

FIG. 4 is a plan view of an end frame.

FIG. 5 is a front view of the end frame.

FIG. 6 is a bottom view of the end frame.

FIG. 7 is a front sectional view of the end frame.

FIG. 8 is a side sectional view of the end frame.

FIG. 9 is a plan view of an end frame main body.

FIG. 10 is a front view of an end frame main body.

FIG. 11 is a bottom view of the end frame main body.

FIG. 12 is a front sectional view of the end frame main body.

FIG. 13 is a side sectional view of the end frame main body.

FIG. 14 is a perspective view of an end frame without a supporting boss.

FIG. 15 is a perspective view of a hoop material before forming a brush holder.

FIG. 16 is a perspective view of a hoop material after a brush holder is formed.

FIG. 17 is a side sectional view of a main part for describing a brush holder forming die.

FIG. 18 is a front sectional view of a main part for explaining a brush holder forming die.

[Explanation of symbols]

5: End frame body, 6: Brush holder, 7: Outside surface, 8: Boss, 19: Resin introduction hole, 28: Supporting boss, 31: Hoop material.

Claims (2)

[Claims] 1. A motor component having a brush holder (6) formed by outsert molding with a molding resin made of an insulating material on an end frame body (5) having a boss (8) forming a bearing accommodating portion. A manufacturing method, comprising: forming a resin introduction hole (19) in an outer surface (7) around a boss (8) of the end frame body (5); A method for manufacturing a motor component, wherein a supporting boss (28) is formed on the outer peripheral surface of the boss portion (8) with a brush holder molding resin via (19). 2. The method for manufacturing a motor component according to claim 1, wherein a plurality of the end frame bodies (5) are continuously formed on the hoop material (31) by drawing. The method for manufacturing a motor component, wherein the brush holder (6) is formed by outsert molding with respect to the end frame body (5) before separation.