JPS60180465A - Manufacture of commutator for flat motor - Google Patents

Abstract

PURPOSE:To facilitate the pressing of a connecting wire of an armature coil by bending the top of a connecting piece of each segment of a commutator to form at least a double structure, thereby improving the strength. CONSTITUTION:A segment 21 of a commutator has a sector-shaped brush slide contact piece 2 and a connecting piece 22 stood from the piece 2 and electrically integrated. The top of the piece 22 is bent, and formed in a reversed U-shaped section. A wiring groove 6 to which a connecting wire 8 of an armature coil is intruded is formed at the top.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method of manufacturing a commutator for a flat motor.

Recently, the first commutator 1 for flat motors,
As shown in Fig. 2, a plurality of segments 4 are made of a highly conductive material and have a fan-shaped brush sliding contact piece 2 and a connecting piece 3 rising from the brush sliding contact piece 2 and forming an electrically integrated unit. A cut groove 6 is installed in an annular shape, and the segments are insulated from each other by an insulating material 5, and a cut groove 6 is bored at the top of the connecting piece 3.
It has been proposed that the segment and the armature coil are connected by pushing the connection llA3 of the armature coil 7 into the armature coil.

However, this type of flat commutator 1 is difficult to manufacture and is therefore expensive. Therefore, traditionally,
For the purpose of cost reduction, it is manufactured through the following four steps shown in Figs. 3 to 6.

In the first step, as shown in FIG. 3, the inner peripheral portion of a disk 9 made of a highly conductive material is raised up by press drawing to form a cylindrical portion 10. The second step is shown in Figure 4.1J, sea urchin,
A connecting piece 3 is formed by cutting a slit 11 vertically into the cylindrical shape art 1o. In the third step, as shown in FIG. 15, resin as an insulation 15 is molded on the inner and outer peripheries of a disk 9 having a circular portion 10 formed on the upper portion, and an integrated insulation portion 12 is formed.
form.

In the fourth step, as shown in FIG.
are cut in opposite to the sleeves 1 to 11 in the cylindrical portion 10, and the exposed surfaces are used to form sector-shaped sliding contact pieces 2 divided into vi numbers, and these sliding contact pieces 2 are
The surface is defined as the brush sliding contact surface 14.

Thus, each of these sliding contacts 2 is connected to the connecting piece 3.
, and the adjacent ones are insulated from each other by the ribs 1 to 11.13, each independently forming one segment 4, and these segments 4 are annular in the radial direction. The slit 13 of the insulating integrated part 12 is not cut into the body part.

However, in the commutator 1 manufactured in this way, the wall thickness of the connecting piece 3 is almost the same as the plate thickness c7) 0.7 m
Since the length is approximately 1.0 mm, the strength is weak, and a strong force cannot be applied when connecting the armature coil 7.

For example, even if a current is applied to the coil 7 while applying pressure to connect the commutator 1 and the connection 18 by heat fusion, it is not possible to apply sufficient force, and the connection force is extremely weak.

Furthermore, since the melting point of solder is low, connection by soldering cannot be used for motors that are subject to high temperatures.

Furthermore, although there is no problem with the temperature when connecting wires by brazing, it is necessary to heat the funmutator 1 until the solder melts, and in that case, there are problems such as the resin of the insulating material 5 melting or the insulation film of the connecting wire 8 breaking. There is a 1fIi selection ()
Work 1 (I is also bad, resulting in a high loss.

The present invention has been made in view of the above-mentioned points, and has at least a double structure by bending the top of the connecting piece of each segment 1- constituting the commutator, thereby making it resistant to pressure even if some heat is applied to the connecting piece. J to right strength, sea urchin er4
The purpose of this invention is to easily manufacture the flat motor #''Funmiko Data, which makes it easy to push in the connecting wires of the aforementioned amateur coils.

Hereinafter, the method for manufacturing a commutator according to the present invention will be explained with reference to the drawings.

Figures 7 and 9 (the same reference numerals are given to the same members as in Figures 1 to 6) show an example of the same commutator 20, and the components of this commutator 2o are Segments 1 to 211; i, similar to segments 1 to 211 shown in FIG. However, it is made of a highly conductive material (for example, copper or a copper alloy). Note that the reference numeral 23 is a stopper piece to prevent removal during resin molding.

To manufacture such a commutator, as shown in FIG. 3, first, the inner peripheral portion of a disk 9 made of a highly conductive material is raised up by press drawing to form a cylindrical portion 10. At the same time or after that, the cylindrical portion 10
Fold the top part inward to form an inverted U-shaped top part. Next, from the top of the inverted U-shaped cross section to the cylindrical part 1
A plurality of connection pieces 22 are formed by cutting into the sleeve 1 at regular intervals on the circumference toward the base of the sleeve 1 (see FIG. 9).

Next, resin as the insulating material 5 is molded on the inner and outer peripheries of the disk 9 on which the cylindrical portion 10 has been formed, thereby forming an integrated insulating portion. As shown in FIGS. 7 and 8, a plurality of radial slits 13 are formed at the lower end of the disk exposed from the lower end surface of the integrated insulation part.
・ A plurality of fan-shaped sliding contact pieces are installed radially on the lower end of this disc by making cuts facing each other, and as shown in FIG. A cutting groove 6 for wire connection is formed.

If the commutator is manufactured in this way, the connecting wire 8
The connecting part is a double layer of plates with a thickness of 7mm to 1.0mm, and these are arranged in a ring with an insulating material in between, so it looks like a reinforcing ring is attached to the top of the commutator. The strength when connecting the connecting wire 8 is significantly improved.

If the strength of the top of the commutator 20 is increased in this way, it can withstand high temperatures, so it is more preferable to use the so-called hot steak method. That is, in this hot steak method, a high temperature chip heated to a predetermined level is used to connect the connecting wire 8 and the steak. This is a method in which the utator 2o is heated and the connecting wire 8 is pushed into the cut groove 6 using the high-temperature tip.

In this way, the connection wire, which has been softened to some extent by heating, is pushed into the kerf 6 of the commutator 2o, thereby making it possible to make a strong connection.

In this case, since the top of the commutator 2o has sufficient pressure resistance, there is no risk of deformation of the commutator itself unlike in the conventional case, and quick work is possible.

In the above-mentioned embodiment, the top of the connecting piece 22 is folded inward, but the point is that the top of the mutator may have at least a double structure, and can be folded outward or bent inward, etc. Needless to say, there are several possible methods.

As is clear from the above description, according to the present invention, the top of the connecting piece is bent or folded to form at least a double structure; The strength of the commutator is improved,
It is now possible to use the so-called hot steak method, and the connection between the commutator and the amateur coil can be made extremely firmly and quickly.In addition, it is possible to connect the commutator with the amateur coil very firmly and quickly, and it is also possible to use the 0-metal in brazing and the solder in soldering. It is also cost-effective because it does not require the use of materials. Particularly, when used in mass production production lines such as those used to improve automobile production, bottlenecks in the process are eliminated and an inexpensive commutator for flat motors can be obtained using a simple WJIJ manufacturing method.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing a conventional flat motor armature, FIG. 2 is a perspective view showing one segment of a commutator of the same armature, and FIGS. 3 to 6 are diagrams showing the manufacturing process of the same commutator. FIG. 7 is a perspective view showing an example of a segment of a commutator according to the present invention, FIG. 8 is a plan view of a fun mutator in which the same segments are combined, and FIG. 9 is a sectional view taken along line H-IX in FIG. 8. . 2... Brush sliding contact piece, 5... Insulating material, 6... Cut groove, 8... Connection wire, 11.1-3... Slit, 20
...Commutator, 21...Segment, 22.
・Connection piece. Patent applicant: Nippon Radiator Co., Ltd. iUgJ Figure 2

Claims (1)

[Claims] (a) A cylindrical portion is formed by raising the inner circumferential portion of a J-made disk made of a good conductive material by press drawing, (b)
At the same time or after that, the top of the cylindrical portion is bent inward or outward to form an inverted U-shaped top in cross section; (C) from the inverted U-shaped top to the base of the cylindrical portion; A plurality of connection pieces are formed by cutting sulin 1- at regular intervals on the circumference. (d) molding resin as an insulating material on the inner and outer peripheries of the disc forming the cylindrical part to form an integrated insulation part; (e) a disc exposed from the lower end surface of the integrated insulation part; A plurality of radial slits are cut into the cylindrical portion at the lower end of the disc, facing each other, and a plurality of fan-shaped sliding contact pieces are arranged radially at the lower end of the disc. f) A method for manufacturing a commutator for a flat moat, characterized in that a connection groove is formed at the top of each connection piece having an inverted U-shaped cross section.