JP3401625B2 - Method of manufacturing cylindrical body having slit and method of manufacturing commutator of micromotor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a cylindrical body having a slit and a method of manufacturing a commutator of a micromotor.

[0002]

2. Description of the Related Art In recent years, with the progress of computerization, there is a tendency that parts and equipment are downsized as compared with conventional ones. For example, in order to make it easy to carry something that you carry, such as a pager,
A smaller one is desired. Therefore, a smaller micromotor is also used as a motor built in a pager and for generating a vibration to notify a call.

A commutator, which is in sliding contact with a brush for supplying electric power to an armature coil, is integrally fixed to the shaft portion of the rotor of this micromotor, that is, the armature rotation shaft. Conventionally, a commutator is formed by integrally mounting a rectangular metal plate, which is rounded along the outer circumference of a rotary shaft, on the rotary shaft so that the concave portions thereof face each other. By bringing the brush into contact with the outer peripheral surface of the commutator, electric power is supplied to the armature coil. The mounting of this commutator will be described below.

First, an outline of the armature will be briefly described with reference to FIGS. 16 and 17. The figure shows an armature 1 of a micromotor. The armature 1 is roughly constituted by a cylindrical armature coil 2 and an armature rotating shaft 3 provided on the axis of the armature coil 2.

A commutator 4 is fixed to the outer peripheral surface of the armature rotating shaft 3 projecting from the coil portion of the armature coil 2. The commutator 4 is connected to the terminals of the armature coil 2 and commutated. A brush 6 to which an electric wire 5 is connected is in sliding contact with the outer peripheral surface of the child 4.

The commutator 4 is attached to the outer periphery of a synthetic resin member 7 formed integrally with the outer peripheral surface of the armature rotary shaft 3. Since the armature 1 of this micromotor is equipped with three coils, the commutator 4 which is also composed of the commutator pieces 4a divided into three along the outer circumference of the armature rotation shaft 3 is also included in the armature rotation shaft 3. Is installed. Further, an insulating member (not shown) is interposed between the synthetic resin member 7 and the armature rotating shaft 3.

The commutator piece 4a is attached to the synthetic resin member 7 by bending a thin metal plate material into an arc shape by a press machine and forming a bent portion on one side, which is attached to the armature rotary shaft 3. Press-fit groove 8 of synthetic resin member 7 molded integrally
(See FIG. 18), it was inserted along the axis of the armature rotary shaft 3.

Into the press-fitting groove 8, three curved commutator pieces 4a are inserted one by one. The commutator piece 4a is inserted into a cylindrical shape with the concave portions facing each other. FIG. 17 shows the insertion of one commutator piece 4a, and FIG. 18 shows the insertion of three commutator pieces 4a. When inserted, this curved portion becomes the commutator piece 4a, and the bent portion is the electric wire 5A of the armature coil 2.
Becomes the terminal portion 4b to which is connected.

Since this commutator 4 is used in a micromotor, each commutator piece 4a is very small (length is about 4 mm, bent portion is about 0.8 mm, and thickness is about 0.13 mm
In addition, the press-fitting groove 8 of the synthetic resin member 7 is also a commutator piece.
Since it is small corresponding to 4a, the insertion work was done manually by the operator while looking at the magnifying glass.

[0010]

In the prior art described above, the operator inserts small commutator pieces one by one into the small press-fitting grooves formed in the synthetic resin member.
The insertion work became complicated and the work efficiency was very poor. Therefore, only a limited amount can be formed, and mass production is difficult.

The present invention has been made in order to solve the above-mentioned conventional problems, and a commutator attached to an armature rotating shaft of a micromotor is formed by a diaphragm to avoid complications caused by manual work. An object of the present invention is to provide a method of manufacturing a cylindrical body having a slit with improved efficiency and a method of manufacturing a commutator of a micromotor.

[0012]

As a means for solving the above-mentioned problems, a method for manufacturing a cylindrical body having a slit according to the present invention comprises punching a metal thin plate material, and elongating the thin metal plate material. The step of forming a radial connecting plate radially connected to each other and the step of gradually squeezing the central portion of the radial connecting plate between the male mold and the female mold are repeated a plurality of times to close the tip, A step of forming a cylindrical body having a slender metal plate as a peripheral wall, and a flange formed by each slender metal plate in a state of being bent in a direction orthogonal to the axis of the cylinder at the rear end of the cylindrical body. A step of cutting at a position and separating the cylindrical body from the thin plate material.

Further, in the method for manufacturing a cylindrical body having slits according to the present invention, the radial connecting plate formed on the thin plate member
It is characterized in that it is formed in a radial connecting plate of 9 to 9 directions.

The method of manufacturing a commutator for a micromotor according to the present invention further comprises a step of punching a metal thin plate material to form a radial connecting plate in which elongated metal plates are radially connected to the thin plate material, A step of gradually narrowing the central portion of the radial connecting plate between a male mold and a female mold is repeated a plurality of times to form a cylindrical body having a tip closed and a peripheral wall of each of the elongated metal plates. , A flange formed by each of the elongated metal plates at the rear end of the cylindrical body bent in a direction orthogonal to the axis of the cylindrical body is cut at an appropriate position, and the cylindrical body is cut from the thin plate material. After the step of separating, the cylindrical body is fitted to the armature rotating shaft of the micromotor, and the armature rotating shaft, the cylindrical body and one end surface of the armature coil are integrally molded with a synthetic resin material. , Cutting the closed side of the cylindrical body

[0015]

As described above, according to the present invention, a thin plate material is punched to form a radial connecting plate in which thin metal plates are radially connected to each other, and the center of the radial connecting plate is a male type and a female type. Since the step of gradually squeezing was repeated a plurality of times by and, a cylindrical body having a slit with the end closed and each elongated metal plate as a wall is formed in the center of the radial connecting plate.

Further, it becomes possible to use a slender metal plate, which is bent in a direction orthogonal to the axis of the cylindrical body at the rear end of the cylindrical body and remains unthrottled, as a flange of the cylindrical body.

Since the flange is cut midway, the cylindrical body can be separated from the thin plate material.

By fitting the separated cylinder into the armature rotating shaft of the micromotor and integrally molding the metal cylinder and the synthetic resin member, the cylinder can be fixed to the armature rotating shaft. become.

After that, if the closed end portion of the cylindrical body is cut, the elongated metal plates are independently attached to the armature rotating shaft.
It is possible to use the commutator piece with which the brush slides on the outer peripheral surface of the cylindrical body and the flange for the terminal portion to which the electric wire of the coil portion is connected.

Further, according to the present invention, a radial radial connecting plate formed on a thin plate member is formed into a radial connecting plate of 3 to 9 directions, and the center of the radial connecting plate of 3 to 9 directions is narrowed to form a cylinder. By forming a body and separating it from the thin plate material, it becomes possible to form a cylindrical body having 3 to 9 slits.

Then, by fitting the cylindrical body to the armature rotating shaft and integrally molding the cylindrical body and the synthetic resin member, the metal cylindrical body can be fixed to the armature rotating shaft. . After that, by cutting the closed side portion of the tip of the cylindrical body, it becomes possible to form a commutator for a 3-coil or 9-coil micromotor.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The members described in FIGS. 16 to 18 are designated by the same reference numerals, and the description thereof will be omitted. FIG. 1 shows a radial connecting plate 11 in which elongated metal plates 10 are radially connected to the surface of a thin metal plate member 9, that is, a radial connecting plate in three directions.
Formed 11.

The radial connecting plates 11 in the three directions are thin plates 9
Is punched into three fan shapes arranged at equal intervals. The fan shape is punched with its main part facing the center of the circle and the arc side facing outward.

Next, as shown in FIG. 2, two cut circles 12A and 12B having different diameters are provided on the outer circumference of the radial connecting plate 11. However, the cutting circle 12A of the smaller diameter is such that the inner part of the arc located between the elongated metal plates 10 forming the radial connecting plate 11 and the metal plate 10 is point-joined 12a at the intermediate position. It is cut. Therefore, three spot junctions 12a are formed inside the cut circle 12A.

Further, the large diameter cutting circle 12B is cut so as to be point-joined 12b at a position inside the extended portion of the elongated metal plate 10. Three points of this point junction 12b are also formed inside the cut circle 12B.

Next, each drawing step of the radial connecting plate 11 will be described with reference to FIGS. These drawings are top views showing a partial shape change in the drawing process of the radial connecting plate 11. First, the tip 15a is closed by repeating the process of gradually squeezing the center of the radial connecting plate 11 between the male mold 13 and the female mold 14 (see FIG. 6) a plurality of times, and three elongated metal plates 10 are formed. A cylindrical body 15 having a wall portion is formed.

That is, as shown in FIG. 3, the male die 13 pushes the central portion of the radial connecting plate 11 to slightly squeeze the central portion, and a shallow cylindrical body 15 is formed in the central portion. (See FIG. 7 schematically showing the drawing step).

As the central portion of the radial connecting plate 11 is squeezed in this way, each elongated metal plate 10 is pulled to the center and the cut circle 12A of the smaller diameter is cut as shown by the arrow A in FIG. As a result, the notches widen and a gap 12C is formed at the outer edge of the elongated metal plate 10.

In FIG. 4, the diameter and length of the male mold 13 and the female mold 14 are changed and further squeezed, and the cylindrical body 15 is elongated compared to the initial squeezing. (See FIG. 8). In this case, the elongated metal plate 10 is also pulled toward the center, and the cut of the cut circle 12A having the smaller diameter is widened so that the gap 12C is further enlarged.

In FIG. 5, the diameter and length of the male mold 13 and the female mold 14 are further changed and squeezed, and the cylindrical body 15 in the central portion is further elongated (the drawing process is schematically shown. See FIG. 9). As a result, the notch of the notch 12 is further widened and the gap 12C is enlarged.

Next, the flange 10a formed by the elongated metal plate 10 left unsqueezed in the state of bending the rear end of the cylindrical body 15 in the direction orthogonal to the axis of the cylindrical body 15 is cut midway. Then, the cylindrical body 15 is separated from the thin plate material 9 (reference numeral B in FIG. 5 indicates a separation line).

10 and 11 show a cylindrical body 15 formed by squeezing a radial connecting plate 11 made of an elongated metal plate 10. Of these, FIG. 10 shows a cross-sectional view of the cylindrical body 15, and the two-dot chain line in the figure shows that the cylindrical body 15 is divided in three directions. FIG. 11 shows a side view of the cylindrical body 15. In this figure, reference numeral 15b is a cylindrical body
Shows 15 slits.

Next, in order to use the cylindrical body 15 as a commutator, the cylindrical body 15 is used as shown in FIG.
Fit to 16. At this time, the flange 10a of each elongated metal plate 10 bent in the direction orthogonal to the axis of the cylindrical body 15 is brought into contact with one end face of the armature coil 17 and fitted.

Then, the cylindrical body 15, the flange 10a, the armature rotating shaft 16, one side surface of the armature coil 17 and the synthetic resin member 18 are integrally molded.

After molding, as shown in FIGS. 13 and 14, if the portion of the cylindrical body 15 on the closed side of the tip 15a is cut, the elongated metal plates 10 are separated from each other and become independent. As a result, the brush 6 (Fig.
A commutator in which the flange 10a serves as a terminal portion to which the electric wire 19 of the armature coil 17 is connected is formed.

13 and 14, an insulating material (not shown) is interposed between the synthetic resin material 18 and the armature rotating shaft 16.

Then, as shown in FIG. 15, the micromotor 22 is formed by disposing the armature 20 formed as described above in the housing 21. Reference numeral 23 denotes a permanent magnet fixed to the outer periphery of a bearing member 24 that rotatably holds the armature rotating shaft 16.

In this embodiment, the radial connecting plates 11 in three directions formed on a thin plate material are formed into a cylindrical body 15 by drawing, and the cylindrical body 15 is fitted to the armature rotating shaft 16 of the micromotor to form a three-coil coil. Although the example in which the commutator of the micromotor 22 is formed has been described, the invention is not limited to this, and the radial connecting plates of 4 to 7 directions can be formed by the drawing process of the present embodiment. By doing so, it is possible to easily form a cylindrical body that can be used as a commutator of the 4-coil to 7-coil micromotor 22 and attach it to the armature rotary shaft 16 with good workability.

[0039]

Since the present invention is constructed as described above, a slit cylinder can be formed by drawing, and this cylinder can be fitted to the armature rotary shaft of a micromotor. For example, the cylindrical body can be used as a commutator. That is, since the commutator is formed of the cylindrical body with slits, it is possible to fit the commutator pieces to the armature rotating shaft without separating each of the commutator pieces while connecting one side. After fitting, the cylindrical body and the armature rotary shaft are integrally molded with a synthetic resin member, and then the tip side of the cylindrical body is cut, making it easy to attach the commutator piece to the armature rotary shaft in one operation. It can be mounted on and can easily automate the troublesome mounting work that has been done so far.

Further, according to the present invention, radial connecting plates in 3 to 9 directions are formed on a thin plate material, and the thin plate material is squeezed to form a cylindrical body. If resin molding is performed and the tip is cut, the commutator of the 3-coil to 9-coil micromotor can be easily attached to the armature rotation shaft. As a result, the workability of mounting the commutator can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

2 is a plan view of FIG. 1 with a cut circle.

FIG. 3 is a plan view showing a state where the center of FIG. 2 is drawn.

FIG. 4 is a plan view showing a further narrowed down version of FIG.

5 is a plan view showing a further narrowed down version of FIG. 4. FIG.

FIG. 6 is a sectional front view showing a state where the radial connecting plate of FIG. 2 is squeezed by a male die and a female die.

7 is a cross-sectional front view showing a portion of FIG. 3 being drawn.

FIG. 8 is a cross-sectional front view showing the drawing process of the one shown in FIG.

9 is a cross-sectional front view showing the drawing process of that of FIG.

FIG. 10D of FIG. 11 of a cylindrical body formed by drawing
It is sectional drawing which follows the -D line.

11 is a view on arrow C of the one in FIG.

FIG. 12 is a cross-sectional view showing a state where a cylindrical body is fitted to a rotary shaft of an armature and integrally molded.

13 is a cross-sectional view of the armature showing a state where the tip of the cylindrical body of FIG. 12 is cut.

FIG. 14 is a left side sectional view of the one shown in FIG.

FIG. 15 is a sectional front view of the micromotor in which the armature of the present embodiment is mounted in the housing.

FIG. 16 is a sectional view of a conventional armature.

FIG. 17 is an exploded view showing attachment of a conventional commutator piece.

FIG. 18 is a side view of the armature of FIG.

[Explanation of symbols]

9 Thin plate material 10 elongated metal plate 10a flange 11 Radial connecting plate 13 Male 14 female 15 cylindrical body 15b slit 16 Armature rotation axis 17 Armature coil 22 micro motor

Claims (3)

(57) [Claims] 1. A step of punching a metal thin plate material to form a radial connecting plate in which elongated metal plates are radially connected to the thin plate material, and a central portion of the radial connecting plate is a male type and a female type. In between, by gradually repeating the step of squeezing a plurality of times, the tip is closed to form a cylindrical body having the elongated metal plate as a peripheral wall, and the rear end of the cylindrical body, the axis of the cylinder. A cylinder having a slit characterized in that it comprises a step of cutting a flange formed of each of the elongated metal plates in a state of being bent in a direction orthogonal to each other at an appropriate position and separating the cylinder from the thin plate material. Body manufacturing method. 2. The method for manufacturing a cylindrical body having a slit according to claim 1, wherein the radial connecting plate formed on the thin plate material is formed on the radial connecting plate of 3 to 9 directions. 3. A step of punching a thin metal plate material to form a radial connecting plate in which thin metal plates are radially connected to the thin plate material, and a central portion of the radial connecting plate is a male type and a female type. In between, the step of gradually narrowing down is repeated a plurality of times to form a cylindrical body with the tip closed and each of the elongated metal plates as a peripheral wall, and the axis of the cylindrical body at the rear end of the cylindrical body. A step of cutting a flange formed of each of the elongated metal plates in a state of being bent in a direction orthogonal to the thin plate material at a proper position, and separating the cylindrical body from the thin plate material; Characterized in that the armature rotary shaft, the cylindrical body, and one end surface of the armature coil are integrally molded with a synthetic resin material by fitting the rotary shaft, and the closed side of the cylindrical body is cut. Method for manufacturing commutator of micro motor.