JPS5854764Y2 - electromagnetic relay - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electromagnetic relay that is suitable for printed circuit boards and can be made smaller and thinner.

In the movable part of an electromagnetic relay, when a permanent magnet piece and a soft magnetic material piece (yoke) are brought into contact and magnetic flux is passed through the soft magnetic material piece, the cross-sectional area and the area of the contact surface are usually the same so that they are in perfect contact. I have to.

By the way, soft magnetic materials (e.g. 1% silicon steel plate,
Decarburized iron plates, etc.) are permanent magnets (e.g. ferrite, SmCO
5, etc.), it is not necessary to make the entire cross-sectional area of the soft magnetic material the same as that of the permanent magnet piece.

Focusing on the above, the present invention has been improved so that the shape of the soft magnetic piece can be made smaller while passing the same amount of magnetic flux from the permanent magnet piece, and it can be made smaller and thinner without reducing sensitivity. The purpose of this invention is to provide an electromagnetic relay with a

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

As shown in FIGS. 1 and 2, this electromagnetic relay is made up of an electromagnet section 100, a movable section 200, and a base 300 stacked one after another.

The electromagnet part 100 consists of an I-shaped core 110 that is insert-molded and covered with a synthetic resin 120.
A spool is formed in the center of this single character,
A coil 130 is wound.

The movable part 200 is insert-molded with a synthetic resin 240 to include two soft magnetic pieces 221 and 222 arranged so as to sandwich the permanent magnet piece 220, and the other soft magnetic piece 230. (shown with a chain line) so that they can rotate together as a unit.

That is, the soft magnetic material piece 2 whose rotating shaft is on the permanent magnet piece 220 side
21 and 222 and the center of the soft magnetic material piece 230, and this rotation axis is parallel to the center part of the 1-shaped core 110 (that is, parallel to the axis of the coil 130), and the core 11
It is positioned directly below the center of 0.

As shown in FIG. 3, eight convex portions 203 to 210 integrally molded from synthetic resin are provided in two rows on the back surface (the side not visible in FIG. 1) of the movable portion 200.

The base 300 is formed into a box shape of synthetic resin and includes a large number of terminal pieces 1a to 12a and 1b to 12b formed on a lead frame made of one copper plate.

The ends of each terminal piece extend into the inside of the base 300 and are exposed, and the movable contact piece 330 and the fixed contact 3
40 are attached alternately in opposite directions to the back side (the side not visible in FIG. 1).

That is, a movable contact piece 330 is provided at the inner end of the terminal piece 3a.
are spot welded, a fixed contact 340 is spot welded to the inner end of the terminal piece 3b, and similarly the terminal pieces 5a and 8a are spot welded.
.

A movable contact piece 330 is attached to the inner end of the terminal piece 5b.
, 8b, and 10b, fixed contacts 340 are spot welded to the inner ends thereof, respectively.

Also, the movable contact pieces 330 are spot-welded to the inner ends of the terminal pieces 4b, 6b, 7b, and 9b so that the movable contact pieces 330 face in the opposite direction to the above, and the movable contact pieces 330 are spot-welded to the inner ends of the terminal pieces 4a, 5a, and 7.
A fixed contact 340 is spot welded to the inner end of a, 8a.

Terminal pieces 3b and 4 on the side to which the fixed contact 340 is welded
Through holes 3c are adjacent to the inside of a, 5b, 6a, 7a, 8b, 9a, and 10b.

4C...10C are provided, and each of the convex parts 203 to 210 of the movable part 200 passes through each of the corresponding through holes 3C to 10C to form a movable contact piece 3.
You can now press 30.

In the movable part 200, the cross-sectional area of the permanent magnet piece 220 is larger than the cross-sectional area of the soft magnetic pieces 221, 222, and the protruding portions are sandwiched between the auxiliary soft magnetic pieces 223, 224.

In this state, the auxiliary soft magnetic pieces 223 and 224 are fixed to the soft magnetic pieces 221 and 222 and the permanent magnet piece 220.

The permanent magnet piece 220 is separated from the soft magnetic piece 221 to the soft magnetic piece 2.
22 is magnetized in the S-+N (or N-+S) direction.

Now, when the coil 130 is excited so that the soft magnetic pieces 221 and 222 are magnetized to opposite polarities, the movable part 200 moves to the second
As shown in the figure, the side of the permanent magnet piece 220 is repelled and tilted.

At this time, the convex portions 204, 206, .
207 and 209 push the movable contact piece 330, and the terminal piece 4a
-4b, 6 a -6b, 7 a -7b, 9 a
-9b opens.

When the coil 130 is turned off, the permanent magnet piece 220 side is attracted, so that the protrusions 203, 205, .
208 and 210 push the movable contact piece 330 1 and the terminal piece 3
a-3b, 5 a-5b, 8 a-8b, 10
a-10b is developed.

Generally, a larger cross-sectional area of the permanent magnet piece is required to obtain a larger amount of magnetic flux.

Therefore, in this embodiment, a permanent magnet piece 220 with a larger cross-sectional area is used, and both sides of the permanent magnet piece 220 are surrounded by soft magnetic pieces 220.
21, 222 and the auxiliary soft magnetic pieces 223, 224 are used to make the auxiliary soft magnetic pieces 223, 234
is short, and the yoke consists of only the soft magnetic pieces 221 and 222, and the cross-sectional area is also smaller than the auxiliary soft magnetic pieces 223 and 2.
The part where the magnets 24 are stacked is the same as the permanent magnet piece 220, but the part where only the soft magnetic pieces 221 and 222 are made is smaller.

However, as described above, the soft magnetic pieces 221 and 222 have a higher magnetic flux density than the permanent magnet piece 220, so a small cross-sectional area is sufficient.

That is, the upper part of the permanent magnet piece 220 (coil 130
223) is open, so the cross-sectional area of the permanent magnet piece 220 is increased and the auxiliary soft magnetic piece 223°224
By arranging the electromagnetic relay, the amount of magnetic flux is increased and the sensitivity is increased without increasing the external size of the electromagnetic relay.

In other words, when using a permanent magnet piece 220 with a large cross-sectional area as shown in FIG. Since it is only necessary to arrange the auxiliary soft magnetic pieces 223 and 224, space can be saved.

According to the present invention, a permanent magnet is sandwiched between a pair of soft magnetic pieces, and an auxiliary magnetic piece is smaller than the soft magnetic pieces and has one side in contact with the soft magnetic piece and the other side in contact with the permanent magnet. Since the sum of the contact area of the soft magnetic material piece that contacts the magnetic pole surface of the permanent magnet and the contact area of the auxiliary magnetic material piece is approximately equal to the magnetic pole surface area of the permanent magnet, the magnetic flux of the permanent magnet can be directly transmitted. The magnetic flux can be effectively utilized by flowing it through the soft magnetic material piece via the auxiliary magnetic material piece, and the movable part can be made lighter and smaller.

As a result, a compact and lightweight electromagnetic relay can be provided.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of one embodiment, Fig. 2 is a longitudinal sectional view of the same,
FIG. 3 is a perspective view of the back surface of the movable part 200. 100...Electromagnet part, 110...Core, 130...Coil, 200...Movable part, 220...Permanent magnet piece, 221 .222,
223゜224.230... Soft magnetic piece, 30
0... Base, 330... Movable contact piece, 340... Fixed contact, 500... Bottom plate.

Claims (1)

[Claim for Utility Model Registration] A base formed by insert molding a terminal piece made of a single metal plate with good conductivity using synthetic resin, a contact circuit section provided on this base, an electromagnet section, and this electromagnet. and a movable part that is pivotally supported between a part and the base and drives the contact circuit part, wherein the movable part includes a pair of soft magnetic pieces and a permanent part held between the soft magnetic pieces. A soft magnetic piece that comes into contact with the magnetic pole face of a permanent magnet, consisting of a magnet and a pair of auxiliary magnetic pieces that are smaller than the soft magnetic piece and have one side in contact with the soft magnetic piece and the other side in contact with a permanent magnet. An electromagnetic relay characterized in that the sum of the contact area of the auxiliary magnetic material piece and the contact area of the auxiliary magnetic material piece is approximately equal to the magnetic pole surface area of the permanent magnet.