JPS6112650Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a coil winding element which can be applied to, for example, inductance elements and small transformers, and which facilitates suitable coil winding terminal processing and cap insertion, and which can further automate this type of element. Regarding improvements.

Conventionally, the coil terminal of a small wire-wound electric element that requires a lead terminal is made by winding a coil 2 around a core 1 manually or using an automatic winding machine, and applying adhesive or a terminal to that part, as shown in Fig. 1, for example. The coil terminal 2a is temporarily fixed by twisting or the like, and then the coil terminal 2a is wound around the lead terminal 3. Moreover, the winding of the coil terminal 2a relies almost entirely on manual labor, which is extremely inefficient, and even if it were automated, the automatic machine would be even more complicated to perform such coil winding and terminal processing all at once. ,
The current situation is that productivity is not always as expected. Furthermore, when it comes to adjusting the number of turns, most automatic machines are single-function machines, and if it is necessary to change the number of coil turns in accordance with electrical characteristics requirements, the machine itself must be replaced, which is disadvantageous. be. Particularly, half-winding of the coil cannot be automated at present and must be done manually, making productivity even worse.

In order to withstand the tensile strength of the lead terminal 3, as shown in FIG. 1, a structure is adopted in which both the core 1 and the lead terminal 3 are fixed with a resin embedding agent 4. However, using resin consumes time to dry the resin, which harms productivity.Furthermore, the presence of resin causes deterioration of electrical characteristics, which worsens yield, and measures to prevent pollution due to the handling of resin. It has various drawbacks. Furthermore, if resin is used, uneven drying will cause uneven spacing between the lead terminals 3, impairing directionality, and making it impossible or significantly impeded to use it in an automatic placement machine, which is unreasonable.

In view of these points, the present invention fundamentally changes the structure of conventional elements of this type, simplifies coil terminal processing, facilitates automation, and integrates lead terminals, cores, coils, and caps without using resin. The main objective is to achieve technical solutions such as improvement of yield and stabilization of electrical characteristics, thereby significantly improving the productivity of this type of device.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is an enlarged vertical sectional view of a coil winding element showing an example of the present invention. 6 is a core, 7 is a coil, 8 is a lead terminal, and 9 is a protective cap. The core 6 is a cylindrical body with a small diameter portion at the center, and two opposing groove portions 6a into which the lead terminals 8 can be partially inserted are formed on the lower side thereof. Each lead terminal 8
is composed of a head portion 8a and a leg portion 8b which are held between a groove portion 6a, and the head portion 8a has a protrusion portion 8c that is slightly larger than the outer diameter of the core 6 and a cut groove for pinching the end portion 7a of the coil 7. 8d is formed. The protrusion 8c is provided with an engagement recess 8e to facilitate engagement with the protective cap 9, while the lower part of the cap 9 is provided with an engagement protrusion 9a that engages with the recess 8e. It is set up accordingly. The length of the cut groove 8d is about half from the lower side of the protrusion 8c, and the groove is tapered so that the entrance is wide and gradually narrows. The lead terminal 8 is made of a good conductor and is formed by punching a thin plate. Therefore, the two leg portions 8b protrude as a pair from the continuous base material 8f. After assembling each component, the leg portion 8b is cut to a desired length to complete the electrical element.

The protective cap 9 is molded from synthetic resin, and its upper part is formed to follow the outer diameter of the core 6, and the lower part is formed to follow the shapes of the core 6 and lead terminals 8, as shown in FIG. . and protrusion 9
a The mutual spacing l is formed to be slightly narrower than the spacing between the valleys of each recessed portion 8e of each lead terminal 8, and when the cap 9 is covered, the core 6, the lead terminal 8, and the protective cap 9 are separated by the elastic force of the cap 9. We aim to fix this. In this case, the core 6 and each lead terminal 8 are fixed with adhesive, but the protrusion 9a of the cap 9
In order to prevent a force from acting on each terminal 8 inwardly if the pressure is large, the position of the protrusion 9a is made as close to the core 6 side as possible.

FIG. 4 is a sectional view showing another example of the present invention. The shape of the core 6 and the terminal treatment of the coil 7 are constructed in the same manner as in the example shown in FIG. 9 is a serrated recess 9b
By doing so, the structure is designed to achieve an engaged state. The specific number and dimensions of the peaks can be selected as appropriate. Further, the above-mentioned engagement configuration is merely an example, and other engagement configurations may also be adopted. Furthermore, the number of lead terminals may be three or more.

It goes without saying that the present invention is applicable not only to inductance elements or transformers, but also to other electrical elements having coils wound thereon.

As described above, according to the present invention, there is a coil wound around a core, and at least two coils engaged with the coil.
The lead terminal includes a head and a leg formed at one end of the core, and the head includes a protrusion with a diameter larger than the outer diameter of the core and an end of the coil. A cut groove is formed to sandwich the core coil, and the protrusion is provided with an engaging recess for engaging with a protective cap that covers the core coil, and the protective cap has an engaging recess that engages with the engaging recess. A mating projection is provided corresponding to the lead terminal, and the engaging projection of the protective cap, the engaging recess of the head of the lead terminal, and the groove of the core are configured to be integrally fixed. Since the above lead terminals and core can be assembled without using resin to fix them, the drying process of the resin can be omitted, the deterioration of the electrical characteristics of this type of parts can be eliminated, and the pollution caused by the use of resin can be eliminated all at once. It is possible to significantly improve productivity through simplification, labor saving, and resource saving.

Further, according to the present invention, the number of turns of the coil can be adjusted by first holding one end of the coil under pressure in the cut groove, and then winding it around the protruding head of the lead terminal after winding the coil half way. This can be done more easily, and the requirements for desired electrical characteristics can be quickly met.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing an example of a conventional element;
The figure is an enlarged cross-sectional view of a coil winding element showing an example of the present invention, and FIG. 3 is a cross-sectional view along the line shown in FIG.
FIG. 4 is a cross-sectional view showing another example of the present invention, and FIG. 5 is a cross-sectional view taken along the line -- in FIG. 6...core, 7...coil, 8...lead terminal, 8a...head, 8b...leg, 8c...protrusion, 8d...cut groove, 8e...engaging recess, 9 ……
Protective cap, 9a...engaging protrusion.

Claims (1)

[Scope of utility model registration request] Consisting of a coil wound around a core and at least two lead terminals engaged with the coil,
The lead terminal is composed of a head and a leg formed at one end of the core, and the head is formed with a protrusion having a diameter larger than the outer diameter of the core and a cut groove for sandwiching the end of the coil. The above core is attached to the protrusion.
An engagement recess is provided for engagement with a protective cap covering the coil, and the protection cap is provided with an engagement protrusion corresponding to the lead terminal that engages with the engagement recess. A coil winding element characterized in that the engaging protrusion of the lead terminal, the engaging recess of the head of the lead terminal, and the groove of the core are integrally fixed to each other.