JPH06267390A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To provide an electromagnetic relay in which bouncing of a normally closed moving contact is reduced during restoring action by causing a division piece having a normally closed moving contact to abut to the edge of a moving contact terminal so that its position is regulated. CONSTITUTION:In an electromagnetic relay, a moving contact piece 24 secured to a moving contact terminal 22 at one end portion is laterally bifurcated at its free end portion into two division pieces 25, 26 and a normally closed moving contact 25a is provided at the free end portion of one of the division pieces (25) and a normally closed moving contact 26a is provided at the free end portion of the other division piece 26. The moving contact terminal 22 is provided with a position-regulating tongue portion 22a to which the division piece 25 provided with the normally closed moving contact 25a abuts when returning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay, and in particular, a make-before-break (Make-Before-B).
The present invention relates to an electromagnetic relay having a reak (hereinafter referred to as "MBB") contact mechanism.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic relay having an MBB contact mechanism, for example, as shown in FIGS. 12 to 22, a box base 10 having a substantially C-shaped cross section and formed on both sides of the upper surface of the box base 10. The contact mechanisms 20, 20, the electromagnet section 30, the movable iron piece 40 having a substantially V-shaped cross section, the hinge spring 50 for urging the movable iron piece 40, and the base 1
And a case 60 having an outer shape that can be fitted to zero.

The box-shaped base 10 has terminal holes 11, 12 and 13 on opposite side walls, and a cavity 14 having an opening on the side.

The contact mechanisms 20, 20 include a normally closed fixed contact terminal 21 having a fixed contact 21a, a movable contact terminal 22 having a movable contact piece 24, and a normally open fixed contact terminal 23 having a fixed contact 23a. Terminal holes 11, 1
It is formed by sequentially press-fitting into 2 and 13 and integrating them.

In particular, the movable contact piece 24 has a width of 2
It is composed of divided pieces 25 and 26 formed by dividing, and each of the divided pieces 25 and 26 is bent downward,
The divided piece 25 is largely bent downward.
The contact provided on the lower surface of the tip of the split piece 25 acts as a normally closed movable contact 25a, and the contact provided on the upper surface of the tip of the split piece 26 acts as a normally open movable contact 26a.

In the electromagnet section 30, an iron core 33 is inserted into a spool 32 around which a coil 31 is wound, one projecting end portion serves as a magnetic pole portion 33a, and the projecting other end portion 33b (FIG. 14) has a substantially L-shape. The bent yoke 34 is fixed to the vertical portion 35 by crimping. The lead wire of the coil 31 is twisted and soldered to the coil terminal 36 provided on the collar portion 32a of the spool 32. Then, the electromagnet portion 30 is press-fitted and fixed in the cavity portion 14 of the base 10 from the side.

The movable iron piece 40 is provided with a card 43 at the tip of a horizontal portion 41, and a projection 44 that abuts only the divided piece 26 is provided on the upper surface of the card 43.

The movable iron piece 40 is attached to the electromagnet section 30.
The inner surface corner portion is positioned at the horizontal tip edge portion of the yoke 34, and the hinge spring 50 having a substantially H-shaped front surface is attached to the receiving portions 15 and 15 of the case 60 and the collar portion 32a of the spool 32 of the electromagnet portion 30. By locking, the elastic tongue piece 51 extending from the central portion of the hinge spring 50 biases the outer surface corner portion of the movable iron piece 40, so that the movable iron piece 40 is rotatably supported.

Then, the case 60 is fitted to the base 10 and the sealant 61 is injected and solidified on the bottom surface of the base 10 to complete the assembly work.

Next, the operation of the electromagnetic relay according to the conventional example will be described. First, in the case of non-excitation, the movable contact piece 24
The horizontal tip portion 41 of the movable iron piece 40 is urged downward by the spring force, and the normally closed movable contact 25a is in pressure contact with the fixed contact 21a (FIGS. 14 and 19A).

Then, when a voltage is applied to the coil 31 of the electromagnet portion 30 to excite it, the magnetic pole portion 33a of the iron core 33 attracts the vertical portion 42 of the movable iron piece 40.
0 rotates about the tip edge of the upper surface of the yoke 34 as a fulcrum. Then, first, the protrusion 44 of the card 43 pushes up the divided piece 26, and the movable contact 26a comes into contact with the fixed contact 23a. Therefore, the movable contacts 25a and 26a are fixed to the fixed contacts 21a and 23.
Each of them simultaneously contacts a and forms an MBB contact mechanism (FIG. 19B). Further, when the movable iron piece 40 rotates, the movable contact 26a comes into pressure contact with the fixed contact 23a and the card 43 pushes up the divided piece 25, so that the movable contact 25a is separated from the fixed contact 21a (FIG. 19).
(C)).

When the excitation is released, the divided pieces 25,
The card 43 is pushed down by the spring force of 26, and the movable iron piece 40 rotates. Therefore, the normally closed movable contact 25a comes into contact with the fixed contact 21a, and the movable contacts 25a and 26a come into contact with the fixed contacts 21a and 23a at the same time to form an MBB contact mechanism (FIG. 21 (b)). Further, when the movable iron piece 40 rotates, the normally closed movable contact 25a comes into pressure contact with the fixed contact 21a, and the movable contact 26a separates from the fixed contact 23a and returns to the original state (FIG. 21 (c)).

[0013]

However, in the electromagnetic relay according to the conventional example, the movable contact 25 is provided at the time of operation and restoration as shown in the time charts of FIGS.
Bouncing is likely to occur in a and 26a. In particular, during operation, the card 43 presses the movable contact piece 24 to regulate its position, so that bouncing is suppressed and it is easy to converge, but when returning, the divided piece 25 is in a so-called free state. Moreover, as shown in FIGS. 16 and 17, the split piece 25 returns at the distance l ₂ between the fulcrums, so that the bouncing is very large. Therefore, desired opening / closing performance cannot be obtained, and the electrical life is short. Further, as shown in the B zone of FIG. 20 and the F zone of FIG. 22, it is difficult to obtain a stable MBB characteristic and contact noise is likely to occur, which causes a problem that the electric circuit is adversely affected.

In view of the above problems, it is an object of the present invention to provide an electromagnetic relay in which the bouncing of the movable contact, particularly the bouncing of the normally closed movable contact at the time of restoration is small.

[0015]

In order to achieve the above-mentioned object, the present invention forms a divided piece by dividing the free end of a movable contact piece whose one end is fixed to a movable contact terminal into two in the width direction, An electromagnetic relay in which a normally closed movable contact is provided at the free end of one of the divided pieces and a normally open movable contact is provided at the free end of the other divided piece, in which the normally closed movable contact is provided at the movable contact terminal. The configuration is such that a position regulating tongue portion is provided that abuts when the divided pieces return. Also, of the divided pieces formed by dividing one end side of the movable contact piece into two in the width direction, a normally closed movable contact is provided at the free end of one divided piece, and the normally open contact is provided at the free end of the other divided piece. While the movable contact is provided, the other end of the movable contact piece is fixed to the movable contact terminal on the axis of the divided piece provided with the normally closed movable contact, and when the divided piece provided with the normally closed movable contact returns, The movable contact terminal may be in contact with the edge portion of the movable contact terminal to regulate the position. Further, a normally closed movable contact is provided at the free end of one of the divided pieces, and a normally open movable contact is provided at the free end of the other divided piece. The divided parts are sandwiched, the base of each divided piece is fixed to the movable contact terminal, and the divided piece provided with the normally closed movable contact comes into contact with the edge of the movable contact terminal to regulate the position when returning. May be. Of the divided pieces formed by dividing one end side of the movable contact piece into two in the width direction, one of the divided pieces is provided with a normally-closed movable contact at the free end, while the other free end is provided with an extending portion. Alternatively, the normally open movable contact may be provided at a portion of the extending portion located on the extension line of the axis of the divided piece provided with the normally closed movable contact.

[0016]

Therefore, the first to fourth aspects of the present invention are provided.
According to this, when the divided piece having the normally-closed movable contact returns, it comes into contact with the edge portion of the movable contact terminal and its position is regulated.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an electromagnetic relay according to the present invention will be described with reference to the accompanying drawings of FIGS. The electromagnetic relay according to the present embodiment is the same as the above-described conventional example except for the contact mechanism 20, so only different contact mechanisms will be illustrated and described for convenience of description.

As shown in FIGS. 1 to 3, the first embodiment is substantially the same as the above-mentioned conventional example, except that the movable contact piece 24 is supported by the movable contact terminal 22.

That is, one end of the movable contact piece 24 is fixed to the upper end surface of the movable contact terminal 22 by crimping, and the position regulating tongue portion is in contact with the lower surface of the split piece 25 from the upper end of the movable contact terminal 22. 22a projects laterally.

Therefore, when the movable iron piece 40 is rotated by exciting the electromagnet portion 30 and the divided pieces 25 and 26 are pressed by the card 43, the divided piece 25 has a distance l ₁ between fulcrums from the card 43 to the base of the caulking portion. And the divided piece 26 also rotates with the same fulcrum distance l ₃ .

When the movable iron piece 40 is returned by releasing the excitation of the electromagnet portion 30, the divided piece 25 contacts the tip edge portion of the position regulating tongue portion 22a, so that the fulcrum distance becomes l _2. On the other hand, since the split piece 26 abuts on the edge of the upper end surface of the movable contact terminal 22, the distance between fulcrums is l ₄ .

Therefore, when returning, the split piece 25 has a shorter fulcrum distance than the split piece 26, so that the spring constant becomes large and bouncing hardly occurs.

In the second embodiment, as shown in FIGS. 4 to 6, the movable contact piece 24 having the divided pieces 25 and 26 is fixed to the movable contact terminal 22 by caulking on the axis of the divided piece 25. is there.

Therefore, when operating, the divided piece 2
5 is the distance l between the fulcrums from the card 44 to the base of the caulking part
_While the divided piece 26 operates as ₁ , the divided piece 26 operates from the protrusion 44 of the card 43 to the base of the divided piece 26 as the inter-fulcrum distance l ₄ .

When returning from the operating state,
Divided pieces 25 while returning from the fixed contact 21a to the distal end portion of the movable contact terminal 22 as the fulcrum distance l _2,
Divided piece 26 returns up its base as a fulcrum distance l ₄ from the fixed contact 21a.

Therefore, since the distance l ₂ between the fulcrums of the split piece 25 when returning is shorter than that of the split piece 26, the spring constant becomes large and bouncing is unlikely to occur.

In the third embodiment, as shown in FIGS. 7 to 9, the movable contact terminal 22 is provided between the movable contact pieces 24 having a substantially U shape.
It is the case where it is attached by inserting the upper end of the. In particular, in this embodiment, the split piece 25 is used as the movable contact terminal 2.
The divided pieces 26 are arranged on the lower surface of the upper end of the movable contact terminal 22, while the divided pieces 26 are arranged on the upper surface of the upper end of the movable contact terminal 22.

Therefore, according to the present embodiment, when operating, the dividing piece 25 operates with the distance from the card 43 to the base of the caulking portion as the fulcrum distance l ₁ , while the dividing piece 2 operates.
6 operates from the protrusion 44 of the card 43 to the tip edge of the movable contact terminal 22 with the inter-fulcrum distance l ₃ .

When returning, the split piece 25 returns from the fixed contact 21a to the edge of the upper end of the movable contact terminal 22 with the inter-fulcrum distance l ₂ while the split piece 2 returns.
6 returns from the fixed contact 21a to the base of the caulking portion as a fulcrum distance l _4.

Therefore, since the distance l ₂ between the fulcrums of the divided pieces 25 when returning is shorter than the distance l ₄ between the fulcrums of the divided pieces 26, bouncing is reduced as in the above-described embodiment.

In the fourth embodiment, as shown in FIGS. 10 and 11, in the above-described embodiments, the split pieces 25 and 26 have the same total length, but the total length is different. Is.

That is, the extending portion 27 is provided at the tip end portion to form the substantially L-shaped divided piece 26, and the normally closed movable contact 25a of the divided piece 25 and the normally open portion provided on the extended portion 27 of the divided piece 26. The movable contact 26a is located on the axis of the divided piece 25.

According to this embodiment, the fulcrum distances l ₁ and l ₂ of the split piece 25 when operating and returning are shorter than the fulcrum distances l ₃ and l ₄ of the split piece 26, respectively, and the spring constant is constant. Is large, so bouncing is reduced.

Moreover, the movable contacts 25a and 26a overlap the upper surface of the fixed contact 21a, and there is no case where the movable contacts 25a and 26a partially contact the fixed contact 21a unlike the so-called crossbar contact of the conventional example. Therefore, there is an advantage that the movable contact 25a is not partially worn, the contact life is extended, and the contact reliability is improved.

[0035]

As is apparent from the above description, according to the first to fourth aspects of the present invention, when the divided piece provided with the normally-closed movable contact is restored, the movable contact terminal has an edge portion. Since the position is abutted and regulated, the distance between the fulcrums when the divided pieces return is short. For this reason, when the divided piece provided with the normally closed movable contact returns, the spring constant becomes larger than that in the case where it operates, and the bouncing is reduced. As a result, desired opening / closing performance is obtained and the electrical life is extended.
Moreover, stable MBB characteristics are obtained and contact noise is prevented from occurring, so that adverse effects on the electric circuit can be prevented.
In particular, according to the present invention, the movable contact piece and the movable contact terminal have a simple shape, and the structure of the press die is simple, so that the productivity can be maintained and the production cost does not increase. Further, according to claim 4, since both the normally closed movable contact and the normally opened movable contact entirely overlap the upper surface of the fixed contact, like a conventional so-called crossbar contact,
Part of the movable contact does not come into contact with the fixed contact.
For this reason, the movable contacts are not partly worn, so that the life of the contacts is extended and the contact reliability is improved.

[Brief description of drawings]

FIG. 1 is an enlarged plan view of essential parts showing a first embodiment of an electromagnetic relay according to the present invention.

FIG. 2 is an enlarged front view of essential parts showing a first embodiment of an electromagnetic relay according to the present invention.

FIG. 3 is an enlarged front view of an essential part showing the first embodiment of the electromagnetic relay according to the present invention.

FIG. 4 is an enlarged plan view of an essential part showing a second embodiment of the electromagnetic relay according to the present invention.

FIG. 5 is an enlarged front view of essential parts showing a second embodiment of the electromagnetic relay according to the present invention.

FIG. 6 is an enlarged front view of an essential part showing a second embodiment of the electromagnetic relay according to the present invention.

FIG. 7 is an enlarged plan view of an essential part showing a third embodiment of the electromagnetic relay according to the present invention.

FIG. 8 is an enlarged front view of essential parts showing a third embodiment of the electromagnetic relay according to the present invention.

FIG. 9 is an enlarged front view of essential parts showing a third embodiment of the electromagnetic relay according to the present invention.

FIG. 10 is an enlarged plan view of essential parts showing a fourth embodiment of the electromagnetic relay according to the present invention.

FIG. 11 is an enlarged side view of essential parts showing a fourth embodiment of the electromagnetic relay according to the present invention.

FIG. 12 is an exploded perspective view showing an electromagnetic relay according to a conventional example.

FIG. 13 is a plan sectional view showing an electromagnetic relay according to a conventional example.

FIG. 14 is a front sectional view showing an electromagnetic relay according to a conventional example.

FIG. 15 is a side sectional view showing an electromagnetic relay according to a conventional example.

FIG. 16 is an enlarged plan view of an essential part showing an electromagnetic relay according to a conventional example.

FIG. 17 is an enlarged front view of an essential part showing an electromagnetic relay according to a conventional example.

FIG. 18 is an enlarged front view of essential parts showing an electromagnetic relay according to a conventional example.

FIG. 19 shows the operation of the electromagnetic relay according to the conventional example,
(A) is a recovery state, (b) is a state in the middle of operation, (c) is an enlarged side view of the main parts showing after the operation is completed.

FIG. 20 is a time chart diagram showing an operation state from a return state of the electromagnetic relay according to the conventional example.

FIG. 21 shows an operation of an electromagnetic relay according to a conventional example,
(A) is an operation | movement state, (b) shows the state in the middle of return, (c) is a principal part expanded side view which shows after completion | finish of return.

FIG. 22 is a time chart diagram showing a return state from an operating state of the electromagnetic relay according to the conventional example.

[Explanation of symbols]

21, 23 ... Fixed contact terminal, 21a, 23a ... Fixed contact, 22 ... Movable contact terminal, 22a ... Position regulating tongue part, 2
4 ... Movable contact piece, 25, 26 ... Division piece, 25a ... Normally closed movable contact, 26a ... Normally open movable contact piece, 43 ... Card, 44
… Protrusion.

Claims (4)

[Claims] 1. A movable contact piece whose one end is fixed to a movable contact terminal is divided into two pieces in a width direction to form a divided piece,
While providing a normally closed movable contact at the free end of one of the divided pieces,
In an electromagnetic relay having a normally open movable contact at the free end of the other segment, the movable contact terminal is provided with a position regulating tongue that abuts when the segment provided with the normally closed movable contact returns. Electromagnetic relay characterized by the following. 2. A normally closed movable contact is provided at the free end of one of the split pieces formed by splitting one end of the movable contact piece in the width direction and the free end of the other split piece. In addition to the normally open movable contact, the other end of the movable contact piece is fixed to the movable contact terminal on the axis of the divided piece provided with the normally closed movable contact.
An electromagnetic relay, characterized in that when a segmented piece provided with a normally-closed movable contact is restored, the divided piece comes into contact with an edge of the movable contact terminal and is regulated in position. 3. A movable contact between substantially U-shaped movable contact pieces in which a normally closed movable contact is provided at a free end of one divided piece and a normally open movable contact is provided at a free end of the other divided piece. The upper end of the terminal is sandwiched, the base of each divided piece is fixed to the movable contact terminal, and the divided piece provided with the normally-closed movable contact comes into contact with the edge of the movable contact terminal to regulate its position. Electromagnetic relay characterized by the following. 4. A normally-closed movable contact is provided at the free end of one of the split pieces formed by splitting one end of the movable contact piece in the width direction, while extending to the other free end. An electromagnetic relay, characterized in that an existing portion is provided, and a normally open movable contact is provided at a portion of the extended portion that is located on an extension line of the axis of the divided piece provided with the normally closed movable contact.