JPH0629870Y2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of the Invention> The present invention relates to an electromagnetic relay having a substantially L-shaped movable iron piece.

<Prior Art and Problems Thereof> An electromagnetic relay of this type is disclosed in, for example, Japanese Utility Model Publication No. 59-7715.

The configuration of the relay is such that a hinge spring is fixed to an iron core frame on which an electromagnetic coil is mounted, the movable iron piece is positioned and locked to the iron core frame at one end of the hinge spring, and the other end of the hinge spring is engaged. A stop spring piece is formed, and the locking spring piece is locked to the base end portion of the movable iron piece, while the driving force when the movable iron piece is attracted to the iron core is transmitted to the movable contact piece via the card. It is a thing.

According to the above configuration, since the movable iron piece is driven to return by the spring force of the locking spring piece, it is not necessary to separately provide a return drive spring, and the structure of the relay is simplified.

However, in the above-mentioned configuration, since a separate card is mounted between the movable iron piece and the movable contact piece, the number of parts increases and the assembling work is troublesome.

Further, in general, the electromagnetic relay is inspected to operate within a predetermined operating voltage range after assembly, and if the electromagnetic relay is out of that range, the movable contact piece is bent to operate within the above predetermined voltage range. Is adjusted.

However, when the movable contact piece is bent, the contact angle between the movable contact provided on the movable contact piece and the fixed contact opposite to the movable contact piece changes, and the contact gear tape and the contact follow change, resulting in contact. The increase in resistance causes heat generation, which shortens the contact life due to contact welding and wear.

On the other hand, in the above-described conventional electromagnetic relay, even if an attempt is made to bend the locking spring piece so as to operate it within the range of the predetermined voltage, a card is interposed between the movable contact piece and the movable iron piece. Therefore, its fine adjustment is extremely difficult.

Further, since the card is made of an electrically insulating material, the contact opening / closing mechanism and the electromagnet block are thermally cut off by the card. Therefore, when heat is generated due to an increase in the contact resistance between the movable contact and the fixed contact, the heat generation more easily causes welding and wear of the contact, which shortens the contact life. <Purpose of the Invention> It was made to solve the above problems,
An object of the present invention is to provide an electromagnetic relay that has a long contact life, a simple structure, a small number of parts, and can be downsized.

<Structure and effect of device> In the electromagnetic relay according to the present invention, a bent portion is formed at one end of the movable iron piece, and the bent portion is locked to the free end portion of the movable contact piece, while It is characterized in that the locking spring pieces of the hinge spring are locked.

According to the above configuration, since the movable contact piece can be directly driven by the movable iron piece, it is not necessary to separately provide a component such as a card and the number of components can be reduced.

Further, since the locking spring piece of the hinge spring is locked to the bent portion of the movable iron piece and is driven to return, a space for installing a spring member such as a coil spring is unnecessary, and the electromagnetic relay can be miniaturized.

Further, the locking spring piece integrally formed at the other end of the hinge spring is locked to the bent portion at the other end of the movable iron piece, and this bent portion is directly attached to the free end of the movable contact piece. Since they are brought into contact with each other and locked, the locking spring piece can be bent and finely adjusted to operate within a predetermined voltage range without bending the movable contact piece.

That is, since it is not necessary to bend the movable contact piece as in the conventional case, the contact gear cup and the contact follow do not change, and the welding and wear of the contact can be effectively prevented and the life of the contact can be extended.

Moreover, the contact opening / closing mechanism on the side of the movable contact and the electromagnet block on the side of the movable iron are relatively fixed by bringing the bent portion of the movable iron piece into direct contact with the free end of the Kato contact piece to lock the movable iron piece. Is thermally coupled with a metal member having good thermal conductivity.

Therefore, the heat generated between the movable contact and the fixed contact is transmitted to the iron core frame through the movable contact piece, the movable iron piece and the hinge spring, and the iron core frame can achieve the function as the heat dissipation fin. .

Therefore, the welding and wear of the contacts can be further prevented, and the life of the contacts can be extended from this point as well.

<Description of Embodiments> FIG. 1 shows an example of an electromagnetic relay according to the present invention.

In the figure, 10 is a case, 11 and 12 are cases 10.
One of the terminal pieces 12 is fixed to the first terminal piece 12 and constitutes a fixed contact piece. Reference numeral 13 denotes an L-shaped iron core frame fixed to the case 10. An iron core 14 is fixed to one piece of the iron core frame 13, and an electromagnetic coil 16 is wound around the iron core 14 via a coil spool 15. There is. 17 and 18 are 1
It is a pair of coil terminals. Reference numeral 19 denotes a substantially L-shaped movable iron piece pivotally supported on one end side of the iron core frame 13, and a bent portion 19a is formed at the base end thereof, and the bent portion 19a is fixed to the terminal piece 11. It is locked to the free end of the movable contact piece 20. Reference numerals 21 and 22 are contacts fixed to the fixed and movable contact pieces 12 and 20, respectively.

The movable iron piece 19 is positioned and locked to the pivotal support portion 13a of the iron core frame 13 by one end bent portion 23a of a hinge spring 23 that is caulked to the outer surface of the other piece of the iron core frame 13. As shown in FIG. 2, a locking spring piece 24 is cut and raised at the other end 23b of the hinge spring 23. The tip of the locking spring piece 24 is engaged with the bent portion 19a of the movable iron piece 19. It is designed to stop and gain a return force. Reference numeral 25 denotes a movable iron piece through hole formed on the one end 23a side of the hinge spring 23, and 2
Reference numerals 6 and 26 are caulking pin insertion holes.

In the above structure, the electromagnetic coil 16 is energized to generate an attracting force on one end surface of the iron core 14, and the movable iron piece 19 is rotationally displaced counterclockwise against the spring force of the locking spring piece 24.
By this rotational displacement, the free end of the movable contact piece 20 is driven, and the movable contact 22 and the fixed contact 21 are closed. When the energization of the electromagnetic coil 16 is released, the movable iron piece 19 pulls the movable contact piece 20 by the spring force of the stop spring piece 24 and returns to the original position, and the movable contact 22 and the fixed contact 21 are opened.

According to the above-mentioned configuration, since the bent portion 19a of the movable iron piece 19 is locked to the movable contact piece 20, the movable iron piece 19 can directly drive the movable contact piece 20, so that it is not necessary to separately provide a component such as a card. The points are reduced.

Further, the locking spring piece 24 of the hinge spring 23 is replaced with the movable iron piece 19
The core frame 13 is locked to the bent portion 19a of the
A space for arranging a coil spring for return drive on the outside of the is not required, and downsizing can be achieved.

Further, the locking spring piece 24 of the hinge spring 23 is attached to the movable iron piece 1.
Since the bent portion 19a is locked to the bent portion 19a at the other end of the movable member 9 and the free end portion of the movable contact piece 20 is locked, the movable contact piece 20 is not bent.
The locking spring piece 24 can be bent and finely adjusted to operate within a predetermined voltage range.

That is, since it is not necessary to bend the movable contact piece 20 as in the conventional case, the contact gear cup and the contact follow do not change, the welding and wear of the contacts 21 and 22 are effectively prevented, and the life of the contact is extended. be able to.

Moreover, the bent portion 19a of the movable iron piece 19 is brought into direct contact with the free end portion of the movable contact piece 20 and locked, whereby the contact opening / closing mechanism on the movable contact piece 20 side and the electromagnet on the movable iron piece 19 side. The block and the block are thermally coupled with each other by a metal member having a relatively high thermal conductivity.

Therefore, the heat generated between the movable contact 22 and the fixed contact 21 is transmitted to the iron core frame 13 through the movable contact piece 20, the movable iron piece 19 and the hinge spring 23, and the iron core frame 1
3 can achieve the function as a heat dissipation fin.

Therefore, it is possible to further prevent the contacts 21 and 22 from being welded or worn, and also from this point, the life of the contacts can be extended.

As described above in detail, according to the present invention, it is possible to provide an electromagnetic relay having a long contact life, a simple structure, a small number of parts, and a small size.

[Brief description of drawings]

FIG. 1 is a front view showing an example of an electromagnetic relay according to the present invention, and FIG. 2 is a perspective view of a hinge spring. 13 ... iron core frame, 13a ... pivotal support, 14 ... iron core, 1
6 ... Electromagnetic coil, 19 ... Movable iron piece, 19a ... Bent portion, 20 ... Movable contact piece, 23 ... Hinge spring, 23a
...... One end part, 23b ...... The other end part, 24 ...... Locking spring piece.

Claims (1)

[Scope of utility model registration request] 1. An iron core around which an electromagnetic coil is wound, an iron core frame to which the iron core is fixed, and one end of the iron core supported by one end of the iron core frame by energizing and disconnecting the electromagnetic coil. A substantially L-shaped movable iron piece that is attracted to and separated from the iron core frame; and a hinge spring whose substantially central portion is fixed to the outer surface of the iron core frame and which positions and locks the movable iron piece on the pivotal support portion of the iron core frame at one end side. A locking spring piece for return drive integrally formed with the other end of the hinge spring and locked by directly contacting the other end of the movable iron piece, and the other end of the movable iron piece are bent. And a bent portion that is locked by directly contacting the free end of the movable contact piece, and turning the movable iron piece against the spring force of the locking spring piece by energizing the electromagnetic coil. Then, the movable contact piece is directly displaced, and the movable contact provided on the movable contact piece is closed. To the fixed contact disposed opposite to the movable contact piece, and the movable iron piece is restored by the spring force of the locking spring piece and the movable contact piece due to the disconnection of the electromagnetic coil, so that the movable contact provided on the movable contact piece is An electromagnetic relay characterized by being configured to be opened from the fixed contact.