JPS59224025A - Electromagnetic relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field to Which the Invention Pertains] This invention particularly relates to a small electromagnetic relay. When this type of electromagnetic relay is mounted on a printed circuit board, for example, it is desired that the installation area be small in order to increase the mounting density of various electronic components arranged on the printed circuit board.

[Prior art and ranking points]

This type of conventional electromagnetic relay is shown in FIGS. 1 and 2, with 1v4 being a longitudinal sectional view and FIG. 2 being a perspective view. In FIG. 1 and FIG. 2, 1 is the winding trunk 2 of the coil bobbin 2.
An electromagnetic coil is wound around a, and an iron core 3 is inserted through the center hole of the pobbin 2.

A magnetic path is formed by this iron core 3, a yoke 4 that is in close contact with the flange, and a movable iron piece 5. The movable iron piece 5 is swingably supported by the yoke 4 at one end thereof, and is attached by a movable contact spring 6a and a caulking 6A, which are bent approximately at right angles to a plate spring 6 fixed to the yoke 4. Movable contacts 7a and 7b are provided on the upper and lower surfaces of the extended end of the contact spring 6. 8a and 8b are movable contacts 7a
and 7b are fixed contacts provided at positions facing each other.

The fixed contact terminal plates 9 and 10 to which the fixed contacts 8a+8b are attached are attached to the upper flange 2b of the coil bobbin 2.
The connection terminal portions 9a and 10a at the tips of these terminal plates 9 and 10 protrude downward from the bottom of the case 12. 13 and 14 are coil terminal plates, and these coil terminal plates are fitted into the grooves of the lower flange 2e of the coil bobbin 2 and fixed, and the electromagnetic coil 10
It is composed of lead wire connection parts 13m and 14m at the start and end of winding, and external connection terminals 13b and 14b. The external connection terminal parts 13b and 14b of the coil terminal plates 13 and 14 installed in this way are attached to the case 1.
It protrudes downward from the bottom of 2. Note that 6c is an external connection terminal provided by extending the lower end of the plate ridge 6 downward from the bottom of the case 12. fcllFi case 12
It is a cover that can be placed over the

Next, the operation of the electromagnetic relay described above will be explained. 1st
The figure shows the demagnetized state of the electromagnetic coil 1. In this state, the movable iron piece 5 is separated from the iron core 3 by the spring force of the return spring 6b, and the movable contact 7b is placed on the fixed contact 8b side of the contact terminal plate 10. are in contact. When the electromagnetic coil 1 is excited, the movable iron piece 5 is attracted to the iron core 3, the movable contact spring 6a of the plate spring 6 is attracted against the spring force of the return spring 6b, and the contact 7b is separated from the contact 8b. Contact 7a contacts contact 8a. That is, by energizing or demagnetizing the electromagnetic coil 1 in this manner, a relay operation can be performed.

However, the conventional electromagnetic relay configured as described above has the following drawbacks. That is, using the bending force of the movable contact spring 6a, the movable contact 7a+ 7
b and the fixed contacts 8a+8b, so in order to obtain this bending force, it is necessary to
a needs to have an appropriate length.

Furthermore, K11l: The return spring 6b that demagnetizes the magnetic coil and returns the movable iron piece 5 during running is the first when the load i on the movable iron piece 5 is released.
Since the longer the distance A shown in the figure is, the smaller the force for returning the movable iron piece 5 can be, so the return spring 6b also needs to have an appropriate length. Therefore, it was necessary to extend the plate spring 6 in the longitudinal direction and install the contact part in a part of the upper part of the coil bobbin 2 that further protrudes from the flange part 2b. Moreover, since the return spring 6b and the movable contact spring 6a are connected in series, the longitudinal dimension of the relay becomes large, resulting in a disadvantage that the installation area of the relay becomes large.

[Purpose of the invention]

The present invention aims to eliminate the above-mentioned drawbacks, reduce the installation area of the relay as much as possible, and provide an inexpensive electromagnetic relay with a small installation area to increase the mounting density of electronic components on a printed circuit board. do.

[Key points of the invention]

In this invention, one end of a return spring bent at a substantially right angle is fixed to a yoke, a meandering folded part is formed at the other end of the return spring, and the folded part is fixed to a movable iron piece.
By fixing the movable contact spring at one end to the yoke side that supports the movable iron piece, the other end of the movable contact spring is fixed to the yoke side that supports the movable iron piece.
The return spring and the movable contact spring can be configured so that they do not protrude from the coil bobbin, and the installation area of the electromagnetic relay can be reduced.

[Embodiments of the invention]

(5) Examples of the present invention will be described below based on the drawings. Third
The figure is a side sectional view of an electromagnetic relay that is an embodiment of the present invention.
FIG. 4 is a front view with the case and cover removed, FIG. 5 is an external perspective view with the case and cover removed, and FIG. 6 is an exploded perspective view with the case and cover removed. 101 coil bobbin 10
An electromagnetic coil wound around the winding trunk 102a of No. 2,
In order to reduce the installation area of the relay, the cross-sectional area is smaller and the body length is smaller than that of the conventional structure. An iron core 103 is inserted through the center hole of the bobbin 102. A magnetic path is formed by this iron core 103, a yoke 104 that is in close contact with the iron core 103, and a movable iron piece 105. 106 is a plate ridge and a movable contact 107
It consists of a movable contact spring 106a for obtaining contact pressure with the fixed contact 108 and a return spring 106b for obtaining a return force of the movable iron piece 105. One end of the movable contact spring 106a is connected to a protrusion 105b provided on the movable iron piece 105. A movable contact 107 is provided at the other end of the movable contact spring 106a, which is engaged and fixed to the movable iron piece 105. One end of the bent return spring 106b bent at an almost right angle is connected to the movable iron piece 105.
The first end engages with the running projection 105C and is fixed to the movable iron piece 105(6), and the other end is formed into a serpentine shape, and the folded part engages with the projection 104b formed on the yoke 104 and is fixed to the movable iron piece 105(6). It is fixed at 104. The movable iron piece 105 is connected to the yoke 1 by the meandering folded end 106c of the return spring 106b.
It is fixed by pressing on the tip of 04. This spring 106m
, 106b have appropriate lengths to fulfill their respective functions, but they are not connected in series as in the conventional device, but are arranged in parallel as described above, and furthermore, the coil bobbin 102
The relay is configured so that it does not extend beyond the outer shape of the flange portions 102b and 102c, and care is taken to prevent the longitudinal dimension of the relay from increasing too much. 108 is a fixed contact provided at a position facing the movable contact 107, and a fixed contact terminal plate 109 to which the fixed contact 108 is attached is attached to the coil bobbin 1.
02 upper flange 102b, - lower flange 102c
Round square holes 102f and 103g are provided at the corners of the terminal board and
The cut and raised portions 109m and 109b of 109 are inserted and fixed. The external connection terminals 109c of the terminal board 109 are made to protrude downward from the bottom of the case 112. Reference numeral 110 denotes a pair of coil terminal plates, and the press-fit pieces 110b are fitted into the grooves of the lower flange 102C and fixed. It is connected and fixed with the upper half of the Nikarage wrapping. The external connection terminal 110c of the coil terminal plate 110 is made to protrude downward from the bottom of the case 112. 111
is a cover that is placed over the case 112. Also 102
d is a fixed contact pedestal projecting upward from the flange 102b at the top of the bobbin, and 102e is a stopper that restricts the return position of the movable iron piece 105.

104a is an external connection terminal obtained by cutting and raising one end of the yoke 104, but it may also be used as an external connection terminal by extending the return spring 106b.

In the above-described embodiment, the return spring 1 is operated by the leaf spring 106.
06b and the movable contact spring 106a are integrally formed, but the return spring 106b and the movable contact spring 106
a may be formed separately for each surface, and the meandering folded part of the return spring 106b is divided at the folded part, and each divided part engages with the protrusion 105C of the movable iron piece 105. It may be configured to be fixed to the movable iron piece 105.

〔Effect of the invention〕

In this invention, one end of a return spring bent at a substantially right angle is fixed to a yoke, a meandering folded part is formed at the other end of the return spring, and the folded part is fixed to a movable iron piece.
From K, the movable contact spring has a movable contact fixed to one end, and the other end is fixed to the yoke side of the movable iron piece that supports the movable iron piece.
The return spring and the movable contact spring can be configured so that they do not protrude beyond the flange of the coil bobbin, and the contact can also be positioned above the bobbin flange, making it possible to reduce the installation area of the relay. In addition, by fixing the coil terminal and contact block using the corners of the bobbin flange, the space created when forming a circular electromagnetic coil can be used effectively, which has the advantage of reducing the installation area. have

[Brief explanation of the drawing]

FIGS. 1 and 2 are a side sectional view and a perspective view of a conventional electromagnetic relay, respectively, FIGS. 3 to 6 each show an embodiment of the present invention, FIG. 3 is a side sectional view thereof, and FIG. The figure is a front view with the case and cover removed, FIG. 5 is an external perspective view (9) with the case and cover removed, and FIG. 6 is an exploded perspective view with the case and cup removed. 101: Electromagnetic coil, 103: Iron core, 104: Yoke, 1
05: Movable iron piece, 106a: Movable contact spring, 106b
:Return spring. (10)

Claims (1)

[Claims] 1) The nine cores, yoke, and movable iron piece are inserted into the coil bobbin around which the electromagnetic coil is wound, and the nine iron cores, the yoke, and the movable iron piece are magnetically coupled to form a magnetic path, and one end of the movable iron piece is returned to the tip of the yoke so that it can swing. A movable contact attached to a spring K and interlocked with a movable iron piece.In an electromagnetic relay of a structure in which a movable contact fixed to the tip of a spring contacts and separates from a fixed contact; one end of the return spring bent at a right angle is connected to the yoke. A meander-shaped folded part is formed at the other end of this return spring, and the folded part is fixed to the movable iron piece.The other end of the movable contact spring, which has a movable contact fixed to one end, An electromagnetic relay characterized by fixing a piece of iron to a yoke that supports it.