JPS6213420Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a commutator device for a small motor, in particular, a narrow part in the terminal part of the commutator piece so that the cross-sectional area in the direction perpendicular to the longitudinal direction is smaller than other parts. A small motor is provided in which the terminal portion is bent in the narrow portion, the lead wire of the armature winding is clamped, and the lead wire and the terminal portion are welded by resistance welding. This invention relates to a commutator device.

In general, the armature windings and commutator pieces in a small motor are connected at terminals provided on the commutator pieces. One of the connection methods is a soldering method. Although this soldering method has a relatively reliable connection, the insulating cylinder on which the commutator piece is attached is generally made of synthetic resin that is weak against heat, so it is difficult to solder. Heat causes deformation, which reduces the dimensional accuracy of the commutator arrangement and adversely affects motor performance. Further, there are drawbacks such as poor workability and the need for skill, and the fact that the inside of the motor is contaminated by scattering solder resin, resulting in problems in terms of workability, quality, cost, etc. Therefore, consideration has been given to connecting the armature windings and commutator pieces by a fusing method, which is a type of resistance welding. However, this fusing method also has the following drawbacks.

Fig. 1 shows an example of a commutator device and an armature in a small motor, and Fig. 2 A shows an arrow A shown in Fig. 1.
- A front view of the conventional commutator device in the direction A, FIG. 2B is a side sectional view taken along arrow B-B in FIG. 2A, and FIG. 2C is a perspective view of the commutator piece in FIGS. 2A and B. It shows. And, code 1 in the figure
is a commutator device, 2 is a commutator piece, 3 is a commutator part, 4
5 is a terminal portion, 5 is an armature, 6 is an armature winding, 7 is a lead wire, 8 is an insulating cylinder, 9 is an insulating collar portion, and 10 is an insulating washer.

In the conventional commutator device 1, as shown in FIGS. 2A and 2B, the commutator piece 2 shown in FIG. It is constructed so that it is fixed by fitting it into 3. Then, the terminal portion 4 is bent into a U-shape, the lead wire 7 drawn out from the armature winding 6 is inserted between the terminal portions 4 as shown in FIG. 1, and the terminal portion 4 is pressed from above with an electrode rod (not shown). Apply voltage at . Due to the voltage application, a current flows through the terminal portion 4, so that the terminal portion 4
generates fever. This heat destroys the insulation coating on the surface of the lead wire 7, causing the lead wire 7 to
With the core wire exposed, the lead wire 7 and the terminal portion 4 are welded together. As a result, the lead wire 7 is held in a pinched state by the terminal portion 4 as shown in FIG.
The terminal portion 4 and the lead wire 7 are electrically connected.

The connection method described above is called the fusing method, and while this method has the advantage of being able to be automated by machines, it is important to ensure that the terminal portion 4 is sufficiently bent in terms of electrical continuity. Since this method is difficult, it has the disadvantage of being less reliable than the soldering method described above. The cause of poor continuity in the fusing method described above is that it is difficult to bend the terminal portion 4 in the shape described above sufficiently, so that the contact between the core wire of the lead wire 7 and the terminal portion 4 is not complete. It lies in what is not done. Therefore, in order to eliminate the causes of the above-mentioned defects, it is considered to increase the value of the current flowing through the terminal portion 4 and to strengthen the pressing force of the electrode rod against the terminal portion 4. As a result, as shown in FIG. As shown in the figure, not only the insulating cylinder 8, the insulating collar 9, etc. are deformed, but also undesirable conditions such as breakage of the lead wire 7 occur. Furthermore, various attempts have been made to improve the drawbacks of the above fusing method. In other words, it goes without saying that efforts have been made to find the optimal values for the pressing force and current value of the electrode rod against the terminal portion 4, and other efforts have been made to improve the shape of the electrode rod, but since the electrode rod wears out rapidly, However, there is a problem that its maintenance and management is troublesome.

The purpose of this invention is to solve the drawbacks and problems in the fusing method as described above.
The terminal part can be easily bent by partially narrowing the width or reducing the thickness of the part of the terminal part where the lead wire is pressed, thereby creating a part with high electrical resistance. Not only that, but the desired heat generation can be obtained even with a small current value, and the heat generation range can be locally suppressed.
It is possible to provide a commutator device for a small motor that can prevent poor conduction between a terminal portion and a lead wire, and can also prevent deformation of an insulating cylinder due to heat. This will be explained below with reference to the drawings.

FIG. 4 is a developed view for explaining one embodiment of the commutator piece used in the commutator device of the present invention, and FIG. 5 is a front view of one embodiment of the commutator device of the present invention (shown in FIG. 2A). (corresponding to the front view), and FIG. 6 is a side sectional view (corresponding to FIG. ) is shown. Among the reference numerals in the drawings, the same reference numerals as those shown in FIGS. 1 to 3 correspond to the reference numerals, and 11 represents a narrow portion.

Commutator piece 2 used in the commutator device of the present invention
As shown in a developed view of one embodiment of the present invention in FIG. 4, a narrow portion 11 having a narrow width is formed in a portion of the terminal portion 4 having a width indicated by the arrow dimension a. That is, the width b of the narrow portion 11 is equal to the width b of the narrow portion 11.
The other width a is smaller than the other width a. and,
Although not shown, the terminal portion 4 is bent at the dotted line portion in the figure so as to stand upright with respect to the commutator portion 3. Further, the terminal portion 4 is bent into a U-shape from the narrow portion 11 in the same manner as shown in FIG. 2C. In this case, it goes without saying that the commutator section 3 is curved in an arc shape along the surface of the insulating cylinder 8. The commutator device of the present invention is constructed by assembling in the same manner as described with reference to FIGS. 1 and 2. Incidentally, a front view of the commutator device of the present invention is shown in FIG. Then, the lead wire 7 is inserted into the narrow part 11 of the terminal part 4, and a current is applied by pressing an electrode rod (not shown) from above the terminal part 4, that is, by a fusing method, as shown in FIG. As shown, the connection between the lead wire 7 and the terminal portion 4 is the same as in the conventional example described with reference to FIGS. 1 to 3.

As explained above, in the commutator device of the present invention, since the narrow part 11 is formed in the terminal part 4 of the commutator piece 2, when current flows through the terminal part 4 by the above-mentioned fusing method, the The electrical resistance value in the narrow portion 11 is greater than in other portions.
Therefore, even if the current value in the above-mentioned fusing method is made smaller compared to the conventional example explained with reference to FIGS. 2 and 3, the above-mentioned fusing conditions can be improved by obtaining the desired heat generation. Become. That is, the insulating coating of the lead wire 7 is easily destroyed, and electrical contact with the terminal portion 4 can be improved. Further, by providing the narrow portion 11, it becomes possible to easily bend the terminal portion 4 into the U-shape described above, and the contact between the lead wire 7 and the terminal portion 4 is further improved. can be improved. Furthermore, by providing the narrow portion 11, the terminal portion 4 can be easily bent into a U-shape, so that the pressing force of the electrode rod against the terminal portion 4 described above can be reduced, and the terminal portion 4 can be easily bent.
The heating is concentrated in the narrow portion 11, resulting in a localized temperature rise, which also has the effect of preventing deformation of the insulating cylinder 8.

In the embodiments shown in FIGS. 4 to 6, the narrow portion 11 is narrower in width than other portions.
Although an embodiment is shown in which the terminal portion 4 is formed, the present invention is not limited to this, and although not shown, for example, a narrow portion may be formed so that the thickness is reduced in the width direction of the terminal portion 4. It is possible to achieve the same effect by doing so.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a commutator device and armature in a small motor, FIG. 2A is a front view of a conventional commutator device in the direction of arrow A-A shown in FIG. Fig. 2A is a side cross-sectional view taken along arrow B-B, Fig. 2C is a perspective view showing an example of a commutator piece used in a conventional commutator device, and Fig. 3 is a lead in a conventional commutator device. FIG. 4 is a side sectional view for explaining an example of a line connection state, FIG. 4 is an exploded view for explaining an embodiment of a commutator piece used in the commutator device of the present invention, and FIG. FIG. 6 is a front view of one embodiment of the child device, and a side sectional view for explaining the lead wire connection state in the present invention. In the figure, 1 is a commutator device, 2 is a commutator piece, 3 is a commutator part, 4 is a terminal part, 5 is an armature, 6 is an armature winding, 7 is a lead wire, 8 is an insulating cylinder, and 9 is 10 represents an insulating washer, and 11 represents a narrow portion.

Claims (1)

[Claims for Utility Model Registration] A commutator piece having a commutator section curved in an arc shape and a terminal section standing upright from the commutator section, and a small diameter section on which the commutator section is placed and the terminal section. is provided with an insulating cylinder having an insulating flange portion on which the commutator piece is placed, and the commutator piece is mounted on the small diameter portion of the insulating cylinder, and the terminal portion is bent so that the lead wire of the armature winding can be clamped. In the commutator device for a small motor configured, the terminal portion has a narrow portion whose cross-sectional area in a direction perpendicular to the longitudinal direction of the terminal portion is smaller than other portions, and in the narrow portion: A U-shaped forming part that is bent and clamps the lead wire is placed on the insulating flange, and the lead wire is welded to the U-shaped forming part of the terminal part by resistance welding. A commutator device for a small motor, characterized by: