JPH07123626A - Motor - Google Patents

Abstract

PURPOSE:To obtain a motor at low cost with high reliability, by outsert-molding in a body the respective annular frames of a plurality of brackets in the state wherein each bracket is connected with a metallic plate via the webs provided in its edge parts opposed radially to each other, in the case of the press-molding of the brackets. CONSTITUTION:In the case of the press-molding of a bracket 10, it is in the state wherein its parts opposed radially to each other are connected respectively with a metallic plate via webs 11, 12, and a plurality of brackets 10 are press- molded simultaneously out of the comparably large metallic plate. Further, in the brackets 10 press-molded out of the metallic plate, their respective annular frames 14 are molded in a body by an outsert-mold in the state wherein each bracket 10 is connected with the metallic plate. Thereafter, the webs 11, 12 of each bracket 10 are cut off from the metallic plate, and concurrently, two brushes are so mounted on groove parts 15, 16 provided in the upper and lower edge parts of the annular frame 14 that they are protruded respectively toward the insides of the grooves 15, 16, and thereby, the manufacture of the bracket 10 is completed. As a result, an excellent motor with a high reliability is obtained at low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly to a structure of a bracket for closing an open end of a case surrounding a rotor.

[0002]

2. Description of the Related Art Conventionally, a motor is constructed, for example, as shown in FIG. That is, in FIG.
Is a case 2 whose one end (the right end in the case shown) is open, and a bracket 3 which closes the open end of the case 2,
A rotor 4 rotatably supported in the center of the case 2.
And a permanent magnet 5 arranged around the inside of the case 2.

The rotating shaft 4a of the rotor 4 is pivotally supported by a bearing 2a provided on the left end surface of the case 2 in the drawing and a bearing 3a provided on the bracket 3, and the rotating shaft 4a is supported by the bearing 3a. A yoke around which a plurality of coils provided around the central portion of 4a at equal angular intervals is wound, and near one end of the rotating shaft 4a (in the illustrated case, the right end portion),
And a commutator 4b mounted around it.

Each commutator 4b is electrically insulated from each other by providing a gap with another commutator adjacent to each other, and the winding ends of two coils adjacent to each other are connected to each other. There is.

The bracket 3 has an annular frame 6 on its inner surface, and is provided with two brushes 7 mounted so as to project inward from opposite sides of the frame 6. The brush 7 is a bracket 3
Is electrically connected to the external connection terminal 8 provided on the end surface of the.

As a result, the coil is energized by supplying power from the external connection terminal 8 through the brush 7 to the adjacent commutator 4b.

Here, as shown in FIG. 5, the bracket 3 is formed by press molding from a flat metal plate, and the annular frame 6 made of resin is attached to the bracket 3 thus formed. It is designed to be attached by heat welding.

According to the motor 1 thus constructed,
Corresponding to the angular position of the rotor 4, the two brushes 7 are always in contact with any two commutators 4b among the commutators 4b arranged around the rotation shaft 4a at equal angular intervals. It will be. Thereby, with respect to the two commutators 4b,
Power is supplied from the external connection terminal 8 through the brush 7. Therefore, one coil, both ends of which are connected to the two commutators 4b, is energized, and the magnetic field generated in the coils is applied to the permanent magnet provided inside the case 2 via the associated yoke. By acting on 5, the rotational force is applied to the rotor 4. Thus, the rotor 4 can be driven to rotate by rotating the rotor 4 around the rotation shaft 4a and repeating the above operation.

[0009]

However, in the motor 1 constructed as described above, the annular frame 6 is attached to the single bracket 3 formed by press molding by heat welding. Therefore, it is necessary to individually attach the annular frame 6 to each bracket 3. Therefore, the workability is poor, the production efficiency is relatively low, and the cost is high.

Further, since the annular frame 6 is attached to the bracket 3 by heat welding, it may be easily detached from the bracket 3 and there is a problem in reliability.

In view of the above points, an object of the present invention is to provide a motor of low cost and high reliability because the annular frame can be easily and reliably attached to the bracket. There is.

[0012]

According to the present invention, the above object is to provide a case whose one end is open, a metal bracket which closes the open end of the case, the case end face and the bracket in the case. A rotor rotatably supported by a bearing provided on the bracket, a resin-made annular frame attached to the inner surface of the bracket, and a rotor arranged so as to project inward from the annular frame. In a motor in which electric power is supplied to the rotor through the brush and the commutator, the bracket is radially opposite when the metal plate is press-molded. It is connected to the metal plate through a web provided on the side edge, and in this state, the annular frame is outsert-molded integrally with the bracket. And, by the motor is achieved.

[0013]

According to the above construction, since the annular frame is integrally formed with the bracket by the outsert molding, the annular frame can be securely attached without coming off from the bracket. Therefore, the reliability can be improved, and since the annular frame is formed in the state where the bracket is connected to the metal plate, once the bracket is connected to the metal plate, the bracket is connected once to the metal plate. Since the annular frame can be integrally formed with each of the plurality of brackets by the outsert molding, the workability can be improved and the cost can be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiments shown in the drawings. 1 and 2 show a bracket in an embodiment of a motor to which the present invention is applied,
The motor itself is configured similarly to the conventional motor 1 shown in FIG. 4, except for the bracket.

1 and 2, the bracket 10
Has a structure similar to that of the conventional bracket 3 shown in FIG. That is, in FIG. 1, the bracket 10 is formed by press-molding a flat metal plate.

Here, the bracket 10 is on the opposite side in the radial direction (at the left and right ends in the drawing) during press forming.
Is connected to the metal plate through the webs 11 and 12. At that time, as shown in FIG. 3, a plurality of brackets 10 are simultaneously formed from a relatively large metal plate 13 by press molding.

In this case, preferably, as shown in the figure, the plurality of brackets 10 are provided with respect to the metal plate 13.
They are arranged in a staggered pattern. As a result, the metal plate 13 can be effectively used.

In the bracket 10 thus press-molded from the metal plate 13, the annular frame 14 is integrally molded by outsert molding while being connected to the metal plate 13. After that, the webs 11 and 12 of each bracket 10 are cut, and the groove portions 15 and 16 provided at the upper and lower edges of the annular frame 14 in the drawing.
By attaching two brushes (not shown) so as to project inward, the bracket 10 shown in FIGS. 1 and 2 is completed.

The motor according to the embodiment of the present invention is constructed as described above. The annular frame 14 is attached to the bracket 10 by integrally molding the press-formed bracket by outsert molding. It can be done easily.

Further, since the bracket 10 is connected to each other in a state where a plurality of brackets are aligned with the metal plate 13, it is possible to perform the outsert molding once.
An annular frame 1 for a plurality of brackets 10 at the same time
Four attachments could be made.

[0021]

As described above, according to the present invention, since the annular frame can be easily and reliably attached to the bracket, the cost is low and the motor is highly reliable. Will be provided.

[Brief description of drawings]

FIG. 1 is a view from inside showing a bracket to which an annular frame is attached in an embodiment of a motor according to the present invention.

FIG. 2 is a view of the bracket of FIG. 1 as viewed from the outside.

FIG. 3 is a schematic view when molding a plurality of brackets of FIG. 1 from a metal plate.

FIG. 4 is a schematic sectional view showing an example of a conventional DC motor.

5 shows a bracket to which an annular frame is attached in the DC motor of FIG. 4, (A) being a view from the inside and (B) being a view from the outside.

[Explanation of symbols]

 10 bracket 11 and 12 web 13 metal plate 14 annular frame 15 and 16 groove

Claims (1)

[Claims] 1. A case, one end of which is open, a metal bracket which closes the open end of the case, and a bearing which is provided in the case end surface and the bracket, and is rotatably supported in the case. A rotor, a resin-made annular frame attached to the inner surface of the bracket, and a brush disposed so as to project inward from the annular frame and contacting a commutator of the rotor, In a motor in which electric power is supplied to the rotor through a brush and a commutator, the bracket is formed by pressing a metal plate through a web provided on an edge portion on a radially opposite side of the bracket. A motor connected to a metal plate, and in this state, an annular frame is outsert-molded integrally with the bracket.