JPH0945205A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress contact rebounce and contact bounce by forming an energizing spring part which is in contact with a base and energizes it in the direction of break of the contact before a mobile contact touches a fixed contact. SOLUTION: For one mobile piece 4b, a mobile contact 4d touches a fixed contact 1b, slowing down the collision speed, while it is energized in the opening direction of a contact by an energizing spring member 4e abutting on the abutting projection 1g of a base 1 first. On the other hand, for the other mobile piece 4a, a mobile contact 4c moves off from the fixed contact 1a, increasing the opening speed, while it is energized in the opening direction of the contact by the energizing spring part 4e abutting on the abutting projection 1g. Hereby, the occurrence of the contact rebounce and the contact bounce is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called balanced armature type electromagnetic relay in which an armature is swingably supported and movable in a central portion.

[0002]

2. Description of the Related Art As this type of electromagnetic relay, there is one having a structure shown in FIGS. This one is base A
And an iron core B wound around a coil (not shown) mounted on the base A, and both ends C ₁ and C ₂ of the iron core B attracted and released around the center as a fulcrum. _The armature C, which is arranged to face ₁ and B ₂ , and the central portion of which is integrally fixed to the armature C, and both ends C ₁ and C of the armature C from the central portion
Movable contacts that come into contact with and separate from fixed contacts A ₁ and A ₂ provided on the base A at the tips of both movable pieces D ₁ and D ₂ that extend in _two directions.
A contact spring D provided with D ₃ and D ₄ and a common terminal piece A ₃ provided on the base A extending from the contact spring D so as to swingably support the central portion of the armature C. Support piece
It consists of E and.

More specifically, the magnetic pole portions B ₁ and B at both ends of the iron core B
Between ₂ is a permanent magnet F is interposed to both ends magnetized central portion of different polarity the same polarity, armature on the central portion of the permanent magnet F
The central part of C is mounted swingably. At this time, the permanent magnets F ₂ magnetize the magnetic poles B ₁ and B ₂ at both ends of the iron core B to the both ends of the permanent magnet F ₁ , and the armature C to the central portion of the permanent magnet F 1 to the same polarity.

The contact springs D are integrally molded and fixed to the armature C with the insulator C ₃ so that two central springs are arranged side by side on both sides of the armature C in a flat plate shape. Both movable pieces D ₁ and D ₂ extending from the central part have insulators at the base end.
It is fixedly supported by C _3, and movable contacts D ₃ and D ₄ are attached to the forked tip.
Are provided respectively.

The supporting piece E extends from one movable piece D ₁ which is eccentrically located from the center of the contact spring D, and is led out from an insulator C ₃ to which the movable piece D ₁ is fixed and its tip end. The portion is electrically connected and fixed to a fixing portion A ₄ which is an exposed portion at one end of the common terminal piece A ₃ provided on the base A.

The operation of this electromagnetic relay is such that when the coil is energized in the specified direction, the permanent magnet F
The armature C magnetized to the same polarity as that of the central part of the armature oscillates with the central part supported by the supporting piece E as a fulcrum, because one end C ₁ is attracted to the magnetic pole part B ₁ of the iron core A. Move. Then, when the coil is de-energized, the supporting piece E becomes a contact spring.
Since it extends eccentrically from the center of D, the support piece E
The return spring force including the spring force of becomes larger than the suction holding force by the magnetic flux of the permanent magnet F, and the armature C reversely oscillates and returns to the original state.

In this way, this electromagnetic relay has an armature C
Is a so-called balanced armature type, which is swingably movable around the central portion as a fulcrum. Then, when the armature C swings, each of the two contact springs D becomes a supporting piece.
While electrically connected to the common terminal strip A ₃ via E,
The movable contacts D ₃ and D _{4 of} both the movable pieces D ₁ and D ₂ have two so-called 1C-type contact configurations in which the movable contacts D ₃ and D ₄ come into contact with and separate from the fixed contacts A ₁ and A ₂ , respectively _One of the movable contacts ₁ , D ₂ is, for example, when returning, as shown in FIG.
In the figure (a), the normally open side, that is, the movable contact D ₃ of the movable piece D ₁ on the NO side.
Before the contact opens (OFF) from the fixed contact A ₁ , the other normally closed side, that is, the movable contact D ₄ of the movable piece D ₂ on the NC side of the same figure (b) abuts (ON) the fixed contact A _2. It also has a so-called MBB type contact structure.

[0008]

In the conventional balanced armature type electromagnetic relay described above, when the armature C oscillates about the central portion as a fulcrum, for example, at the time of returning, the contact shown in FIG. When the movable contact D ₃ of the movable piece D ₁ on the NO side is separated (OFF) from the fixed contact A _1, contact rebounce occurs due to the vibration of the movable piece D ₁ , or the movable side of the NC side of the same figure (b) moves. Piece D ₂
When the movable contact D ₄ of contacts the fixed contact A ₂ (ON),
As a contact bounce occurs due to the collision of D ₄ itself, as the MBB type contact structure, the movable contact D ₄ on the NC side is first contacted until the movable contact D ₃ on the NO side is completely opened. Within the MBB time t, the time during which both the NC side and NO side contacts are in the ON state is shortened, and stable M
It may be difficult to secure the BB state.

Further, even in the case of the MBB type contact structure as described above, contact rebounce and contact bounce occur, and contact reliability and welding resistance of the contact are deteriorated.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a balanced amateur type electromagnetic relay capable of suppressing the occurrence of contact rebounce and contact bounce.

[0011]

In order to solve the above-mentioned problems, according to a first aspect of the present invention, a base, an iron core around which a coil is wound and mounted on the base, and both ends are fulcrum points at the center. And the armature disposed opposite to the magnetic poles at both ends of the iron core to be attracted and released respectively, and the central part is integrally fixed to the armature and extends from the central part toward both ends of the armature. The contact springs are provided with movable contacts that come in contact with and separate from fixed contacts provided on the base at the tip of both movable pieces, and the bases are extended from the contact springs to swingably support the central part of the armature. A support piece fixed to a common terminal piece provided in the movable relay, the movable pieces contact the base before the movable contact contacts the fixed contact, and in the contact opening direction. The biasing spring part that biases the It is the respective formed configuration.

According to a second aspect of the present invention, in the first aspect, the biasing spring portion is formed by cutting and raising from the movable piece in the contact abutting direction.

According to a third aspect of the present invention, in the first aspect of the present invention, the contact convex portion with which the biasing spring portion abuts is provided on the base.

According to a fourth aspect of the present invention, in the first and second movable pieces, before the movable contact of one of the movable pieces separates from the fixed contact, the other movable contact of the movable piece contacts the movable piece. It is configured to abut the fixed contact.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes a base, which is formed into a rectangular parallelepiped by integrally molding a later-described iron core 2 around which a coil (not shown) is wound and a permanent magnet 21 with a synthetic resin. The fixed contacts 1a, 1b are formed at the corners, and the fixed portions 1c, 1c are provided at the centers on both sides in the longitudinal direction.The fixed contacts 1a, 1b, the coil, the contact terminal pieces 1d respectively connected to the fixed portion 1c, The coil terminal piece 1e and the common terminal piece 1f are integrally formed and led out from both sides in the longitudinal direction.

Reference numeral 2 denotes an iron core, which is made of a magnetic material and has a central piece and both leg pieces formed in a substantially U-shape. A coil is wound around the central piece via a coil bobbin, and a permanent magnet is provided between the both leg pieces.
21 is sandwiched. The permanent magnet 21 has N poles with the same poles at both ends and a S pole with different poles at the center.
Both leg pieces are magnetized to the N pole by the permanent magnets 21 as the magnetic pole portions 2a and 2b at both ends.

Reference numeral 3 denotes an armature, which is formed of a magnetic material in a flat plate shape, and a central portion provided with a ridge (not shown) in the lateral direction is swingable to the central portion of the permanent magnet 21. Both ends 3a, 3b in the longitudinal direction are supported by a support piece 5 described later.
Are arranged so as to oppose the magnetic pole portions 2a and 2b at both ends of the iron core 1. At this time, the armature 3 is magnetized to the S pole magnetized in the central portion of the permanent magnet 21.

Reference numeral 4 denotes a contact spring, which is made of a thin plate spring material such as a copper alloy and is formed integrally with the armature 3 with an insulator 31 at its center so that two pieces are arranged side by side on both sides of the armature 3. Both movable pieces 4 that are fixed and extended from the center
a and 4b are fixedly supported by the extending portions 31a of the insulator 31 whose base end portions are extended to both sides of the armature 3 and fixed contacts 1a and 1b are provided on one side of the bifurcated tip portion. Movable contacts 4c and 4d that come into contact with and separate from each other are provided.

As shown in FIG. 4, both movable pieces 4a and 4b are shear-cut on the three sides and fold on the one side at the base end portion derived from the extending portion 31a of the insulator 31. A bent tongue-shaped urging spring portion 4e is formed by cutting and raising to one surface side which is the contact abutting direction, and this urging spring portion 4e has movable contacts 4c and 4d, as will be described later. Before contacting the fixed contacts 1a, 1b respectively, the contact contacts 1a, 1b are brought into contact with contact contact projections 1g provided on the base 1 to urge them in the contact opening direction.

Reference numeral 5 denotes a support piece, which extends from the base end portion of the one movable piece 4a of the two contact springs 4, and extends the insulator 31 for fixing and supporting the base end portion of the one movable piece 4a. It is derived from the opposite side of the part 31a. Therefore, this support piece 5 extends from the side of the movable piece 4a, which is eccentric to the central swing axis of the swinging armature 3, and is folded back in the middle to form a U-shape. Has been formed.

Both ends of the two support pieces 5 are welded and fixed to the fixing portions 1c provided at the centers of both sides of the base 1 in the longitudinal direction, so that the armature 3 is provided at the central portion as described above. The ridge is swingably supported at the center of the permanent magnet 21, and both ends 3a, 3b are both magnetic poles 2a, 2b of the iron core 1.
The two contact springs 4 are electrically connected to the common terminal piece 1f through the support piece 5 and are in contact with the fixed contacts 1a and 1b, which are the movable contacts 4c and 4d, respectively. It is arranged at a position where it can be separated.

Reference numeral 6 denotes a case, which is made of a synthetic resin and is formed in a box shape with a bottom, one end of which is opened. The inner surface and the outer surface of the bottom portion of the case are so-called roughened to be roughened. Then, the base 1 is fitted from the opening side.

Next, the operation will be described. When the coil is energized in the specified direction, the magnetic pole portion 2a at one end of the iron core 2 is the N pole, and the magnetic pole portion at the other end 2b
When it is excited so that it becomes the S pole, the armature 3 is swingably supported by the central ridge of the permanent magnet 21 which is magnetized by the S pole of the permanent magnet 21 and magnetized by the S pole. The one end portion 3a is attracted to the one end magnetic pole portion 2a, and the other end portion 3b repels and is released from the other end magnetic pole portion 2b, and swings around the ridge as a fulcrum. Then, the one movable piece 4a of the contact spring 4 is, as shown in FIG.
First, the biasing spring portion 4e contacts the contact protrusion 1g of the base 1 and is biased in the contact opening direction, while the movable contact 4c slows the collision speed and contacts the fixed contact 1a.

Next, when the coil is de-energized, the supporting piece is
Since 5 extends eccentrically with respect to the central swing axis of the armature 3, the return spring force including the spring force of the support piece 5 becomes larger than the adsorption holding force due to the magnetic flux of the permanent magnet 21. ,
The armature 3 swings in reverse and returns.

During this recovery, as shown in FIG. 3, there is a state in which both the movable contacts 4c and 4d are in contact with the fixed contacts 2a and 2b, respectively. That is, as shown in FIG.
Before the movable contact 4c of the normally open side, ie, NO side movable piece 4a in (a) is separated (OFF) from the fixed contact 2a, the normally closed side, ie, NC side movable piece 4b in FIG. Contact 4d contacts fixed contact 2b
It has a so-called MBB type contact structure that turns on.

In the movable piece 4b on the NC side, the urging spring portion 4e first contacts the abutting convex portion 1g of the base 1 to urge the movable contact 4d while urging in the contact opening direction. Slow the speed to contact the fixed contact 1b, and the other movable piece on the NO side
The movable contact 4c is separated from the fixed contact 1a by increasing the opening speed while being urged in the contact opening direction by the urging spring portion 4e contacting the contact protrusion 1g.

As described above, this electromagnetic relay has the armature 3
Is a so-called balanced armature type in which the armature is swingably movable about the central portion, and when the armature 3 swings, each of the two contact springs 4 has a common terminal via a support piece 5. There are two so-called 1C type contact configurations in which the movable contacts 4c, 4d of both movable pieces 4a, 4b come into contact with and separate from the fixed contacts 1a, 1b in a state of being electrically connected to the piece 1f, and The movable pieces 4a and 4b have a so-called MBB type contact structure in which the movable contact of one of the movable pieces contacts the fixed contact before the movable contact of the other movable piece separates from the fixed contact.

In such an electromagnetic relay, as described above, when the armature 3 oscillates about the central portion as a fulcrum, for example, at the time of returning, the movable contact 4b on the NC side in FIG. 5B is used.
When contacting (ON) the fixed contact 1b, the biasing spring portion 4e formed by cutting and raising integrally before contacting the fixed contact 1b
The contact speed of the movable contact 4b with the fixed contact 1b is slowed down because the movable contact 4b is urged in the contact opening direction by being abutted against the contact protrusion 1g.
The contact bounce of the movable contact 4b itself is less likely to occur, and when the NO side movable contact 4c in the figure (a) is separated (OFF) from the fixed contact 1a, the contact spring is opened by the biasing spring portion 4e. Since the opening speed of the movable contact 4c is increased by being urged in the separating direction, contact rebounce due to the vibration of the movable piece 4a is less likely to occur. Therefore, as the MBB type contact structure, the movable contact 4b on the NC side is first. In the MBB time t from when the contact on the NO side to the movable contact 4c on the NO side is completely opened, both the NC side contact and the NO side contact are in the contact state for a long time, and a stable MBB state is maintained. Can be secured.

The urging spring portion 4e is formed by cutting and raising the movable pieces 4a, 4b in the contact abutting direction.
Since the movable pieces 4a, 4b are not integrated with each other and are provided separately, or extended from the movable pieces 4a, 4b in the direction orthogonal to the contact direction, no extra space is required, so that the size can be reduced.

Further, since the biasing spring portion 4e is positioned and abuts against the abutting convex portion 1g provided on the base 1 without being flat, the biasing force is stable.

Further, since the case 6 has a roughened surface by being textured on the outer surface of the bottom, when the marking is displayed on the outer surface, the marking ink enters the rough uneven portion,
The marking is hard to disappear, and when the case 6 is molded with a die, the inner surface is also textured to make it rough, so the outer side is rough due to the rough uneven parts. There's no such thing as cutting into a mold and releasing it.

Although the MBB type contact structure is used in the present embodiment, a normal 1C type contact structure, that is,
Even after the movable contact of one of the movable pieces is separated from the fixed contact, even if the movable contact of the other movable piece comes into contact with the fixed contact, contact bounce and contact rebounce are less likely to occur, Needless to say, the contact reliability and welding resistance of the contacts are improved.

Further, in this embodiment, the contact convex portion 1g with which the biasing spring portion 4e abuts is provided on the base 1. However, for example, when there is no space in the abutting direction, the abutment is not necessarily abutted. The convex portion 1g may not be provided.

Further, in this embodiment, the urging spring portion 4e is
It is formed by cutting and raising from the movable pieces 4a, 4b in the contact abutting direction.However, for example, when there is a space in the direction orthogonal to the contact direction, it extends from the movable pieces 4a, 4b in the orthogonal direction. It may be provided and formed.

Further, in the present embodiment, since the permanent magnet 21 is used, it is a so-called polarized type electromagnetic relay that energizes the coil in a specified direction, but the armature 3 swings in the central portion. The permanent magnet 21 is not always required as long as it is a balance amateur type that is supported and moved freely.

[0037]

According to the first aspect of the present invention, in the movable piece, when the movable contact comes into contact with the fixed contact, the urging spring portion integrally formed before the contact comes into contact with the base. The contact bounce of the movable contact itself is less likely to occur because the collision speed of the movable contact with the fixed contact is slowed down by being urged in the contact opening direction, and when the movable contact separates from the fixed contact, The biasing spring biases the contact opening direction to accelerate the opening speed of the movable contact, making it difficult for contact rebounce to occur due to the vibration of the movable piece, which in turn improves contact reliability and welding resistance. improves.

According to a second aspect of the invention, in addition to the effect of the first aspect, the biasing spring portion formed by cutting and raising the movable piece in the contact abutting direction extends in the direction orthogonal to the abutting direction. Since it does not require space, it can be made compact.

According to the third aspect of the invention, in addition to the effect of the first aspect of the invention, the biasing spring portion surely positions and abuts not the flat surface but the abutting convex portion provided on the base. , Its bias is stable.

According to a fourth aspect of the present invention, both movable pieces have a so-called MBB type contact structure in which one of the movable contacts comes into contact with the fixed contact before the other movable contact is separated from the fixed contact. Since contact bounce and contact rebounce are unlikely to occur, the time during which both contacts are in contact with each other becomes long within the MBB time, and a stable MBB state can be secured.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a front view showing a state in which the coil of the above is energized.

FIG. 3 is a front view showing the process of returning to a state where the coil of the same is deenergized.

FIG. 4 is a partially enlarged perspective view showing a main part of the above.

FIG. 5 is a diagram showing a contact waveform of the same.

FIG. 6 is a perspective view showing a conventional example.

FIG. 7 is a diagram showing a contact waveform of the same.

[Explanation of symbols]

 1 Base 1a, 1b Fixed contact 1f Common terminal piece 1g Abutting convex part 2 Iron core 2a, 2b Both ends magnetic pole part 3 Armature 3a, 3b Both ends 4 Contact springs 4a, 4b Both movable pieces 4c, 4d Moving contact 4e Energizing Spring part 5 Support piece

Claims (4)

[Claims] 1. A base, an iron core wound around a coil and mounted on the base, and armatures whose both ends are respectively disposed opposite to the magnetic poles at both ends of the iron core which are respectively sucked and released around the central portion as a fulcrum. , The central portion is integrally fixed to the armature, and the movable contacts that come in contact with and separate from the fixed contact provided on the base are provided at the tip portions of both movable pieces extending from the central portion toward both ends of the armature. Contact springs provided respectively, and support pieces extending from the contact springs for swingably supporting the central portion of the armature and fixed to a common terminal piece provided on the base,
In the electromagnetic relay provided with, both of the movable pieces are integrally formed with an urging spring portion that abuts against the base and urges in the contact opening direction before the movable contact comes into contact with the fixed contact. Electromagnetic relay characterized by being done. 2. The electromagnetic relay according to claim 1, wherein the biasing spring portion is formed by cutting and raising from the movable piece in a contact abutting direction. 3. An abutting convex portion with which the biasing spring portion abuts,
The electromagnetic relay according to claim 1, wherein the electromagnetic relay is provided on the base. 4. The movable piece of any one of the movable pieces contacts the fixed contact of the other movable contact before the movable contact of one of the movable pieces separates from the fixed contact. Electromagnetic relay.