JPS592165B2 - electromagnetic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the structure of an electromagnetic device in which a coil device in which a coil is wound around a molded bobbin is inserted into an iron core.

In conventional electromagnetic devices of this type, after the iron core is inserted into the bobbin, the iron core is fixed using a clamper or the like to prevent it from collapsing before assembly.

However, the clamper is completely unnecessary as an electromagnetic device, and the cost and installation work are not only wasted, but also makes it difficult to install the clamper if the terminal block is integrated with the bobbin. There is a problem. In view of these circumstances, the present invention provides a structure for attaching an iron core made of laminated iron plates to a bobbin without using a clamper, and will be described in detail below using embodiments shown in the drawings.

In Figures 1 to 5, 1 is an I-shaped central leg core;
A molded bobbin 2.2 made of synthetic resin is inserted.

Reference numeral 3 denotes a side leg iron core that is attached from the side, and the leg portions 31.3 sandwich the flange portion 21.22 of the forming bobbin 2 from the outside.
It has an E shape with 2.

Reference numeral 23 designates a terminal block that projects horizontally from the outside of one flange portion 22, is integrally molded, and has a terminal 24 implanted therein.

This terminal block 23 is effective for automatic assembly of this type of coil device. Reference numeral 33 denotes a pair of locking claws formed as hook-shaped protrusions at opposite positions of the leg parts 31 and 32 of the side leg core 3, which are formed by stepped parts provided on the outside of the flange parts 21 and 22 of the forming bobbin 2. It engages with the engaging portion 25.

A coil 4 is wound around the forming bobbin 2, and its lead wire is connected to a terminal 24, although not shown.

A method of assembling an electromagnetic device having such a configuration will be explained.

First, a formed bobbin 2 wound with a predetermined coil 4 is inserted into the center leg core 1 which is also stacked to a predetermined thickness. At this time, the terminal block 23 of the forming bobbin 2 is positioned on the outside. Next, the side leg cores 3, which are also stacked to a predetermined thickness, are attached from the side. At this time, the flange portions 21 and 22 of the forming bobbin 2 are sandwiched from the outside by the opposing legs 31 and 32, and the positional relationship between the two forming bobbins 2 and 2 is fixed. The locking portions 33 provided on the legs 31 and 32 are hook-shaped with tapered surfaces, and the engaging portions 25 formed on the flanges 21 and 22 are also configured as stepped portions with tapered surfaces. , both tapered surfaces slide, and the flange portion 21
Due to the J22 trigram and the slight elasticity of the legs 31 and 32, pressing engagement is possible relatively easily. This engagement relationship is not easily disengaged, and the side leg core 3 and the forming bobbin 2 are locked to each other. Also, although not shown in the figure, the center leg iron core 1
If both ends of the center leg core 3 are made thinner and the outer leg portions 31 of the side leg cores 3 are lengthened accordingly, the center leg core 1 is held by the side leg cores 3, making it easier to handle. Furthermore, the flange portion 2
1 and 22, the leg portion 31. of the side leg core 3 as shown in FIG.
It is advantageous to provide upper and lower step portions 26, 26 that fit and support 32 in the stacking direction, as this will stabilize the installation. In this way, an electromagnetic device consisting of a combination of the molded bobbin 2 with the coil 4 wound thereon and the iron core is temporarily assembled, and then caulked with metal fittings for fixing the entire assembly together.

Conventionally, since the side leg core 3 could not be attached to the bobbin, both ends had to be temporarily secured with a clamper, but with the present invention, the clamper itself can be omitted, making it possible to reduce the cost. There are configurable effects. Moreover, when the terminal block 23 is provided integrally with the molded bobbin 2, the terminal block 23 is located in the place where the clamper was conventionally mounted, as shown in FIG. 2, making it virtually impossible to mount the clamper. There is a strong possibility. Therefore, the present invention is particularly effective when using the molded bobbin 2 provided with the terminal block 23. Regarding the punching of the side leg core 3, as shown in Fig.
This is convenient because it can be cut into a shape that corresponds to the back of the core, and the punching process is no different from that of conventional side leg cores. As explained in detail above, the present invention consists of a central leg core into which a molded bobbin with a terminal block protruding from the outside of the flange portion is inserted, and a side leg core which is mounted from the sides so as to sandwich the molded bobbin. A locking pawl is formed on at least one pair of legs of the side leg core, and a flange portion of the molded poppin is provided with a stepped portion into which the side leg core fits and an engaging portion with which the locking pawl engages. be.

Therefore, according to the present invention, the iron core and the forming bobbin can be temporarily fixed to each other by simply inserting the iron core into the forming bobbin, and the iron core is maintained in the attached state at least in the horizontal state.
Materials and processes for temporarily fixing the core such as clampers are not required. Moreover, since the molded bobbin and the iron core are attached by a pair of locking claws and an engaging portion, there is an advantage that the positional relationship can be determined reliably.

[Brief explanation of drawings]

The drawings all show embodiments of the present invention; FIG. 1 is a plan view showing a method of punching out the side leg core of the first embodiment;
The figure is a plan view showing the forming bobbin attached to the center leg core, Figure 3 is a plan view of the main part showing the side leg core being attached to the forming bobbin, and Figure 4 is a plan view of the main part in the attached state. FIG. 5 is a perspective view showing an embodiment of a forming bobbin. 1 shown in the figure is a central leg core, 2 is a molded bobbin, 21, 2
2 is a flange portion, 25 is an engaging portion, 3 is a side leg core, 31,
32 is a leg portion, and 33 is a locking claw.

Claims (1)

[Claims] 1. In an electromagnetic device comprising an iron core formed by laminating iron plates and a molded bobbin with a terminal block protruding outside the flange portion attached to the iron core, the core is a central leg iron core into which the molded bobbin is inserted. , a side leg core that is attached from the sides so as to sandwich the molding bobbin with its legs, a locking pawl is formed on at least one pair of legs of the side leg core, and the side leg core is provided on the outside of the flange of the molding bobbin. An electromagnetic device characterized in that a stepped portion is formed to fit and support the leg portion of the leg core in a stacking direction, and an engaging portion is provided with which the locking pawl engages.