JPS61105808A - Electromagnetic device - Google Patents

Abstract

PURPOSE:To need no fitting screw for a device and simplify a fitting work by embedding this embedding projection into a concave portion of a top face of a fitting boss in a device body through providing both sides of insulating protective case with the embedding projection. CONSTITUTION:When a coil 2 is wound on a coil bobbin 1 in which a terminal pin 3 is fixed in a body and soldered to the terminal pin 3, an iron core 4 of silicon steel plate is installed and a transformer body A is assembled, and then, this transformer body A is accommodation-fixed to an insulating protective case 9 of resin molding and the terminal pin 3 is vertically projected from a bottom face of the insulating protective case 9. After fitting pieces 9a are built 8in both sides of the bottom of the insulating protective case 9, a projection 9b is built in the fitting piece 9a in a backward direction of the terminal pin 3. The projection 9b is embedded in a concave portion 12b of a top face of a fitting boss 12a built in an inside face of a device body 12. Therefore, it is fixed to the device body 12 without any fitting screw, a fitting work is simplified and a cost of the device is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to electromagnetic devices such as transformers used in consumer and industrial electronic equipment, and relates to their implementation.

Conventional structure and problems In recent years, small and lightweight transformers using the pin terminal method are made to stand on their own on the wiring board and are fixed by soldering. ◇; A large load is concentrated on the pin terminal, and a local load is placed on the printed wiring board, which may cause wire breakage in the transformer or lifting or peeling of the copper foil on the printed wiring board. As a countermeasure against these problems, the transformer body has conventionally been housed in an insulated protective case made of a molded product, and this insulated protective case has been fixed to the equipment using fastening screws.

Hereinafter, a conventional transformer will be explained based on the drawings. 7th
The figure is an exploded perspective view of a conventional transformer, FIG. 8 is a perspective view of the assembled state, and FIG. 9 is a front view of the equipment.

As shown in FIGS. 7 and 8, a winding 2 is wound around a coil bobbin 1 to which a terminal pin 3 is integrally fixed, and a winding 2 is connected to the terminal pin 3 by soldering, and an iron core 4 made of a silicon steel plate is attached. This constitutes a transformer body 8, and this transformer body Δ is housed and fixed in an insulating protective case 5 made of a resin molded product.

This insulating protection case 5 has the terminal pins 3 protruding from the bottom, and has a recessed piece 5 on both sides of the bottom.
a is provided in a protruding manner, and the mounting piece 5a is provided with a through hole 5b. Note that FIG. 10 shows another example of the insulation protection case 5.

As shown in FIG. 9, this transformer is mounted on a mounting boss 8a of the main body 8 of the device via the printed wiring board 6, with the terminal pins 3 placed on the printed wiring board 6 soldered to copper foil. It is fixed to the main body 8 of the device by screwing the screw 7 into the mounting boss 8a through the piece 5a.

However, such a conventional transformer requires fastening screws 7 to be fixed to the device body 8, and also requires work to tighten the screws 7, which has the disadvantage of increasing the cost of the device. .

Purpose of the Invention The purpose of the present invention is to provide an electromagnetic device that does not require screws for attachment to equipment, can simplify the installation work, and can reduce the cost of the equipment. The electromagnetic device includes a main body of the electromagnetic device, which is composed of a coil bobbin to which a terminal pin is integrally fixed, a winding wound around the coil bobbin, and an iron core attached to the coil bobbin. A mounting device comprising: an insulating protective case from which a terminal pin protrudes vertically; and fitting protrusions protruding from both sides of the insulating protective case in parallel with the terminal pins, the fitting protrusions protruding from the inner surface of the device body. It is designed to fit into the recess at the top of the service boss.

In this way, by providing fitting protrusions on both sides of the insulation protection case and fitting the fitting protrusions into the four parts on the top surface of the removal boss on the device body, it is possible to eliminate the need for screws on the device body. This simplifies the installation process and reduces equipment costs.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is an exploded perspective view of the embodiment, FIG. 2 is a perspective view of the assembled state, and FIG. 3 is a front view of the mounted state.

As shown in FIGS. 1 and 2, this transformer consists of a coil bobbin 1 with a terminal pin 3 fixed thereon, a winding 2 wound around the coil bobbin 1, which is connected to the terminal pin 3 by soldering, and an iron core 4 made of a silicon steel plate. The transformer body A is attached to an insulating protective case 9 made of a resin molded product.
The terminal pin 3 protrudes perpendicularly from the bottom surface of the insulation protection case 9.

The insulating protective case 9 has a protruding piece 9a on both sides of the bottom, and a protrusion 9b on the mounting piece 9a for connecting the terminal pin 3.
It protrudes in the opposite direction.

As shown in FIG. 3, this transformer is mounted on a printed wiring board 6 with terminal pins 3 soldered to copper foil, and is installed at the top of a mounting boss 12a that protrudes from a device body 12 made of a molded product. It is fixed to the device main body 12 by fitting the protrusion 9h into the recess 12b of the surface.

As described above, in this embodiment, fitting protrusions 9b are provided on both sides of the insulating protection case 9 that accommodates and fixes the transformer main body A, and the protrusions 9b are attached to the mounting bosses 12a that protrude from the inner surface of the device main body 12. Since it is fitted into the recess 12b on the top surface, it can be fixed to the device main body 12 without the need for fastening screws, which simplifies the installation work and reduces the cost of the device. can.

Another embodiment of the invention will be described based on FIGS. 4 to 6. FIG. 4 is a perspective view of the insulation protection case, FIG. 5 is a perspective view of the transformer in an assembled state, and FIG. 6 is a perspective view of the transformer installed in a device.

This transformer is similar to the previous embodiment except that the protrusion 9b is provided in the opposite direction to that of the previous embodiment, that is, in the same direction as the terminal pin 3 protruding direction.

As shown in FIG. 6, this transformer is mounted on a printed wiring board 6 with the terminal pins 3 and protrusions 9b passing through the printed wiring board 6, and the terminal pins 3 are soldered to copper foil.
In this state, when the protrusion 9b is fitted into the recess on the top surface of the mounting boss 13a on the inner surface of the device body 13, the boss 13c provided on the inner surface of the device body 13 presses the protrusion 9a. It is fixed at 13.

The effects of this embodiment are similar to those of the previous embodiment.

Although the above embodiments have been described with respect to transformers, the present invention can be applied to various electromagnetic devices such as choke coils in addition to transformers.

Effects of the Invention The electromagnetic device of the present invention has fitting protrusions on both sides of the insulating protection case, and these fitting protrusions are fitted into the recesses on the top surface of the mounting boss of the device body. It can be fixed without the need for screws, which simplifies installation work and reduces equipment costs. Furthermore, since no screws are used, both the device body side and the transformer side are made of molded parts, resulting in high dimensional accuracy and a highly reliable mounting structure.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a transformer according to an embodiment of the present invention.
Fig. 2 is a perspective view of the assembled state, Fig. 3 is a front view of the state installed in the equipment, Fig. 4 is a perspective view of the insulation protection case in another embodiment of the present invention, and Fig. 5 is the assembly of the transformer. Figure 6 is a front view of the transformer installed in the equipment, Figure 7 is an exploded perspective view of a conventional transformer, Figure 8 is a perspective view of the assembled transformer, and Figure 9 is the transformer installed in the equipment. front view of,
FIG. 10 is a perspective view of another insulation protection case. A...Transformer body (electromagnetic device body), ■...Coil bobbin, 2...Winding, 3...Terminal bin, 4...
Iron core, 9...Insulation protection case, 9a...Protrusion piece, 9b
...NiJ! ! Hole, 12...Device body, 12a...
・Mounting boss, 12b... recess = 31

Claims (1)

[Claims] An electromagnetic device main body is composed of a coil bobbin with a terminal pin integrally fixed thereto, a winding wound around the coil bobbin, and an iron core attached to the coil bobbin. an insulating protective case that protrudes from the terminal pin; and a fitting protrusion that protrudes from both sides of the insulating protective case in parallel with the terminal pin; An electromagnetic device that fits into a recess.