JPH0773795A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To prevent the generation of contact bounce due to a bounce of a card by utilizing a bounce of a card at the time of collision of the card with a yoke to secure a clearance between the card and a movable spring even in the case where a distance between one side surface of one piece of a yoke and the movable spring is small without increasing the shape in the clearance direction, namely, height of a device. CONSTITUTION:Since a recessed part 3d is formed at a contact/separating part of a card 5 of a yoke 3, a clearance S between the card 5 and a movable spring 6 is enlarged by the depth thereof. Consequently, even in the case where a distance between the outside surface of the other piece 3b of the yoke 3 and the movable spring 6 is small, a clearance S between the card 5 and the movable spring 6 for preventing the collision of the card 5 with the movable spring 6 due to a bounce of the collision of the card 5 with the yoke 3 can be secured. Generation of contact bounce to be generated by a bounce at the time of collision of the card 5 with the yoke 3 is thereby prevented without increasing the shape in the clearance S direction, namely, height of a device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay in which an armature is rotatably supported by a yoke.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic relay of this type, FIG.
And, there is a configuration shown in FIG. This is composed of an iron core 1, a coil 2 wound around the iron core 1, a yoke 3 fixed to the iron core 1, one piece 4a and the other piece 4b and formed into a substantially L shape, and the inside thereof. Hinge spring 4 at the corner of yoke 3
The armature 4 which is rotatably supported by c and whose one piece 4a is sucked and released to the iron core 1 and the other piece 4b of the armature 4 which is fixed to the armature 4 and is brought into contact with and separated from the flat contact and separation portion of the yoke 3. And a movable spring 6 provided with a normally-closed movable contact 6a that is separated from the normally-closed fixed contact 6b by being pressed by the card 5 driven in a direction away from the yoke 3. , And are configured.

The operation of this device will be described below. Coil 2
When a current is applied, a magnetic flux penetrating the iron core 1 is generated, and one piece 4a of the armature 4 is attracted to the iron core 1 so as to form a closed magnetic circuit,
By rotating the armature 4 while being supported by the hinge spring 4c, the card 5 fixed to the other piece 4b of the armature 4 is driven to move away from the flat contact and separation portion of the yoke 3. The card 5 driven in a direction away from the yoke 3 presses the movable spring 6 so that the normally closed movable contact 6
a is opened from the normally closed side fixed contact 6b.

When the coil 2 is de-energized, the magnetic flux penetrating the iron core 1 is erased, the one piece 4a of the armature 4 is released from the iron core 1, and the armature 4 is rotated with the hinge spring 4c supporting it. By moving, the card 5 fixed to the other piece 4b of the armature 4 is driven so as to come into contact with the flat contact and separation portion of the yoke 3. Then, when the card 5 comes into contact with the contacting / separating portion of the yoke 3, the normally-closed side movable contact 6a becomes the normally-closed side fixed contact 6b with a predetermined contact pressure by its own spring force. While abutting, the card 5 faces the movable spring 6 with a gap S so as not to hit the movable spring 6.

[0005]

In the conventional electromagnetic relay described above, when the card 5 is in contact with the contact / separation portion of the yoke 3, the gap S is provided so as not to hit the movable spring 6. If the gap S is small and the contact 4 is released from the iron core 1 and the card 5 comes into contact with the yoke 3 when the amount of rebound due to a collision becomes larger than the gap S, the card 5 When the movable spring 6 hits the movable spring 6, the normally-closed movable contact 6
So-called contact bounce in which a separates from the normally closed fixed contact 6b is likely to occur. Therefore, if the gap S is increased, the outer shape in that direction, that is, the height is increased.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electromagnetic relay capable of preventing contact bounce without enlarging the outer shape.

[0007]

In order to solve the above-mentioned problems, an electromagnetic relay of the present invention comprises an iron core, a coil wound around the iron core, a yoke fixed to the iron core, and An armature in which one piece and the other piece are formed in a substantially L-shape and whose inner corner is rotatably supported by the end of the yoke, and one piece is sucked and released by the iron core, and the other piece of the armature. Movable with a card that is fixed and driven to move toward and away from the yoke, and a normally-closed movable contact that opens from the normally-closed fixed contact when pressed by a card that is driven away from the yoke In the electromagnetic relay provided with a spring, the yoke has a structure in which a concave portion is formed in a contacting / separating portion of the card.

[0008]

According to the above-described electromagnetic relay of the present invention, since the yoke has the concave portion formed in the contacting / separating portion of the card, the gap between the card and the movable spring is increased by the depth of the concave portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. Members having substantially the same functions as those of the conventional example are designated by the same reference numerals.

This electromagnetic relay comprises an iron core 1, a coil 2, a yoke 3, an armature 4, a card 5, a movable spring 6, a base 7 and a cover 8.

The iron core 1 is formed of a magnetic material into a substantially round bar shape with one end 1a having a large diameter.

The coil 2 has an iron core 1 through a coil frame 21.
It is wound around. More specifically, the coil frame 21 is made of a molding material such as plastic and is formed into a substantially cylindrical shape with the flange portions 21b at both ends of the winding drum portion 21a.
Is wound around the winding drum portion 21a. Then, the iron core 1 is inserted into the cylindrical hole of the coil frame 21 from the other end 1b side so that the one end 1a and the other end 1b respectively project from both openings.

The yoke 3 is made of a magnetic material and is formed by bending the one piece 3a and the other piece 3b into an L shape. The length of the one piece 3a is substantially equal to the diameter of the flange portion 21b of the coil frame 21, and the fitting hole 3c of the iron core 1 is penetrated through substantially the center thereof, and the other piece 3b has the length of iron. The core 1 is substantially the same as the core 1, and on the outer surface thereof, a groove-shaped recess 3d extending in the width direction is formed at a contact / separation portion of a card 5 described later. And
The fitting hole 3c of the one piece 3b is fitted into the other end 1b of the iron core 1 so that the other piece 3b is parallel to the iron core 1 and the coil frame 2
It is caulked and fixed in close contact with the first collar portion 21b.

The armature 4 is made of a magnetic material and is made of a piece 4a.
And the other piece 4b are bent to form an obtuse L-shape, and the inside corners of the bent portion are rotatable with the end of the other piece 3b of the yoke 3 abutted. Hinge spring 4c
Therefore, the outer corner of the bent portion is pressed and supported. At this time, the one piece 4a faces the one end 1a of the iron core 1, and the pressing force of the hinge spring 4c acts so as to bias the other piece 4b toward the other piece 3b of the yoke 3.

The card 5 covers the tip of the other piece 4b of the armature 4 with a molding material such as plastic and drives the drive section 5
a is formed, and the outer side surface is fixed to the vicinity of the bent portion by integral molding. Then, as described above, when the other piece 4b of the armature 4 is biased by the hinge spring 4c, the drive portion 5a fits into the recess 3d provided in the yoke 3.

The movable spring 6 is formed of a thin plate spring material such as a copper alloy in a long shape, and its base end is fixed to a movable spring support plate 7a arranged on a base 7 described later. A normally-closed movable contact 6a that comes into contact with and separates from the normally-closed fixed contact 6b is provided on one side of the substantially center thereof, and a normally-open side movable contact 6c that comes into contact with and separates from the normally-open fixed contact 6d on the other side of the tip. Are fixed respectively. The drive portion 5a of the card 5 faces the one surface of the movable spring 6 slightly closer to the front end than the normally-closed movable contact 6a with a gap S.

The base 7 is formed of a molding material such as plastic into a substantially flat plate shape, and on its inner surface side, a movable spring support plate 7a, a fixed contact plate 7b to which a normally closed fixed contact 6b is fixed, and a normally open side. The fixed contact plate 7c to which the fixed contact 6d is fixed is disposed, and the external connection terminals 7d, 7e, 7f and the coil terminal 7g are led out to the other surface side. Then, the box-shaped cover 8 is fitted on the base 7.

The operation of this device will be described below. When the coil 2 is energized in the state of FIG. 3 (a), a magnetic flux penetrating the iron core 1 is generated, and one piece 4a of the armature 4 is attracted to the one end 1a of the iron core 1 so as to form a closed magnetic circuit. , The inner corner of the bent portion is brought into contact with the end of the other piece 3b of the yoke 3, and the outer corner of the bent portion is rotated by the hinge spring 4c while being rotated. As shown in b),
The card 5 fixed to the other piece 4b of the armature 4 is the yoke 3
The movable spring 6 is pressed by the drive portion 5a of the card 5 which is driven away from the yoke 3 and is driven to move away from the groove-shaped recess 3d formed in the contact / separation portion of the outer surface of the other piece 3b. As shown in FIG. 3C, the movable spring 6
The normally closed side movable contact 6a fixed to the
The normally open side movable contact 6c fixed to the movable spring 6 contacts the normally open side fixed contact 6d.

When the coil 2 is de-energized, the magnetic flux penetrating the iron core 1 is erased, the one piece 4a of the armature 4 is released from the one end 1a of the iron core 1, and the armature 4 is supported by the hinge spring 4c. By rotating the coil 2 in the opposite direction to when the coil 2 is energized, the drive portion 5a of the card 5 fixed to the other piece 4b of the armature 4 is formed at the contact / separation portion of the yoke 3. The normally open side movable contact 6c, which is driven to come into contact with the groove-shaped recess 3d and is fixed to the movable spring 6, is separated from the normally open side fixed contact 6d, and subsequently, the normally closed side movable contact 6a is fixed to the movable spring 6. Is brought into contact with the normally closed side fixed contact 6b by a predetermined contact pressure by its own spring force, and the drive portion 5a of the card 5 is
When is in contact with the recess 3d of the yoke 3, the drive unit 5a faces the movable spring 6 with a gap S so as not to hit the movable spring 6.

In such an electromagnetic relay, since the yoke 3 has the concave portion 3d formed in the contact / separation portion of the card 5, the gap S between the card 5 and the movable spring 6 is increased by the depth thereof. Therefore, the outer surface of the other piece 3b of the yoke 3 and the movable spring 6 are
Even if the distance between the movable spring 6 and the movable spring 6 does not collide with the movable spring 6 due to the rebound caused by the collision when the card 5 hits the yoke 3, a gap S with the movable spring 6 can be secured, and thus the direction of the gap S It is possible to prevent the contact bounce that occurs when the card 5 collides with the yoke 3 without increasing the outer shape, that is, the height.

Further, the armature 4 is rotated in a state where the inside corner of the bent portion is in contact with the end of the other piece 3b of the yoke 3, so that the worn iron from the contacting portion is rotated. Since the powder collects in the concave portion 3d of the contact / separation portion, it is possible to prevent the wear iron powder from entering the contact portion and stabilize the contact resistance of the contact.

A second embodiment of the present invention will be described below with reference to FIG. The members having substantially the same functions as those in the first embodiment are designated by the same reference numerals, and only the differences from the first embodiment will be described below.

In the first embodiment, the recess 3d has a groove shape, whereas in the present embodiment, the opening edge of the recess 3d has a distance from the outer edge of the yoke 3.

In such an electromagnetic relay, in addition to the same effect as in the first embodiment, since the cross-sectional area of the yoke 3 excluding the recessed portion 3d can be made large, the magnetic flux is generated by the yoke 3.
The magnetic flux generated in the coil 2 can be effectively used because the magnetic flux easily passes through the inside of the coil. Further, it is possible to effectively collect the wear iron powder from the abutting portion. That is, in the first embodiment, since the recess 3d is groove-shaped, the recess 3d
While the worn iron powder accumulated in the outer edge may overflow from the opening edge that is the outer edge, in the second embodiment, the opening edge of the recess 3d has a distance from the outer edge of the yoke 3. It is less likely that the worn iron powder collected in the recess 3d will overflow from the opening edge. Therefore, it is possible to prevent the wear iron powder from entering the contact portion more efficiently, and further stabilize the contact resistance of the contact.

[0025]

According to the first aspect of the present invention, since the yoke has the concave portion formed in the contact / separation portion of the card, the gap between the card and the movable spring is increased by the depth of the concave portion. Therefore,
Even if the distance between the outer surface of the other side of the yoke and the movable spring is small, it is possible to secure a gap between the movable spring and the movable spring so that the card does not collide with the movable spring due to the collision when the card hits the yoke. Therefore, it is possible to prevent the contact bounce caused by the rebound when the card collides with the yoke without increasing the outer shape in the gap direction, that is, the height.

Further, in addition to the effect of the first aspect, in the second aspect, since the opening edge of the recess is formed with a distance from the outer edge of the yoke, the yoke is formed. The area of the cross section excluding the concave portion can be increased, and the magnetic flux can easily pass through the inside of the yoke, and the magnetic flux generated by the coil can be effectively used.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention.

FIG. 2 is a perspective view of the yoke above.

FIG. 3 is a partial front sectional view showing an operating state of the above card.

FIG. 4 is a perspective view of a yoke according to a second embodiment of the present invention.

FIG. 5 is a vertical sectional view of a conventional example.

FIG. 6 is a perspective view of the yoke above.

[Explanation of symbols]

 1 Iron core 2 Coil 3 Yoke 3d Recess 4 Armature 4a One piece 4b The other piece 5 Card 6 Moving spring 6a Normally closed side movable contact 6b Normally closed side fixed contact

Claims (2)

[Claims] 1. An iron core, a coil wound around the iron core, a yoke fixed to the iron core, one piece and the other piece formed in a substantially L-shape, and an inner corner portion of the iron piece. The armature rotatably supported at the end, one piece of which is sucked and released to the iron core, the card fixed to the other piece of the armature and driven to come in and out of contact with the yoke, and separated from the yoke. A movable spring provided with a normally-closed movable contact that is separated from the normally-closed fixed contact by being pressed by a card driven in a direction, wherein the yoke is a contact / separation portion of the card. An electromagnetic relay, characterized in that a recess is formed in the. 2. The electromagnetic relay according to claim 1, wherein an opening edge of the recess is formed with a distance from an outer end of the yoke.