JPH08180783A - Electromagnetic relay - Google Patents

Abstract

PURPOSE: To provide an electromagnetic relay which has a contact point frame united with a spool, whose contact mechanism can be composed highly precisely and at the same time simplified, and which can be miniaturized and assembled easily. CONSTITUTION: Guide grooves 21b, 21c are formed in a through hole 21a of a contact point frame 21 formed unitedly with a spool 2 in the lower part and flat plate parts 84, 101 of fixed terminal pieces 8, 10 are inserted in the grooves mutually from reverse directions. A fixed a-contact point 9 and a fixed b-contact point 11 are installed in the flat plate parts 84, 101 and a movable contact point 7 attached to the tip end of a movable contact point spring 6 is set between the fixed contact points. A connection part 82 extended from the flat plate part 84 downward is formed in the fixed terminal piece 8 and an external terminal part 83 is formed through a supporting face part 81 having a horizontal face. The supporting face part 81 is brought into contact with a contact point frame 21 and the stress applied to the external terminal part 83 is supported on the contact point frame 21.

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 more particularly to a structure of an electric relay having a contact structure constructed by introducing a movable contact into a contact frame for fixing a fixed contact.

[0002]

2. Description of the Related Art A conventional electromagnetic relay has a spool around which a coil is wound, an iron core inserted through a center hole formed in the spool, a yoke connected to the iron core, and a hinge joint to the yoke. The movable piece, a movable contact spring elastically connecting the movable piece to the yoke and having a movable contact at its tip, and a pair of fixed terminal pieces having a fixed contact facing the movable contact. There is a hinge type electromagnetic relay.

There are various types of hinge-type electromagnetic relays, and among them, there is one in which a contact frame integrally formed with the spool is provided. The contact frame is formed on the collar portion of the spool, and the fixed contacts formed on the pair of fixed pieces are inserted and fixed in two stages, upper and lower. The tip of the movable contact spring is inserted between the pair of fixed contacts, and the movable contact formed at the tip is arranged between the pair of fixed contacts.

[0004]

In the above-mentioned conventional electromagnetic relay, in order to simplify the structure of the contact portion and facilitate the assembly, the electromagnetic relay is introduced from a side surface direction different from the introduction direction of the movable contact spring with respect to the contact frame. A fixed terminal piece was inserted, and one fixed contact was fixed by the base.
However, although these structures are convenient at the time of assembly, in the former method, since the fixed terminal pieces are attached to the sides, it is difficult to handle the coil terminal pieces and the like, and it is possible to achieve a sufficient miniaturization of the relay. There is a problem that it cannot be done, and the structure of the contact frame is complicated. Further, the latter method has a problem in that the operation test is difficult because the contact portion is not formed unless the base is attached, and the contact accuracy depends on the attachment accuracy of the base.

Further, in a relay having a structure in which a contact portion is provided on the base side of a coil, it is usually impossible to fix the terminal piece to a spool or the like. Therefore, the base fixes a part of the fixed contact and each terminal piece. It is necessary to crimp each terminal to the terminal hole formed in the base. However, such caulking fixing is a complicated work and hinders simplification of the manufacturing process, and it is difficult to secure strength against a high load, especially a load in the direction of inserting the terminal into the base, when fixing the terminal in the terminal hole. There is a problem that is.

Therefore, the present invention is to solve the above-mentioned problems, and an object thereof is to make it possible to obtain a contact structure of an electromagnetic relay which can be miniaturized and which can ensure the accuracy of a contact portion in an efficient manufacturing process. Therefore, it is preferable to realize a structure having high terminal strength without fixing each terminal piece to the base.

[0007]

Means for Solving the Problems The means taken by the present invention to solve the above-mentioned problems are a first and a second that are opposed to each other with a movable contact introduced between them on a spool around which a coil is wound. A contact frame for supporting and fixing the first fixed terminal piece having the first fixed contact and the second fixed terminal piece having the second fixed contact is integrally provided so as to arrange the fixed contact. In the electromagnetic relay, the contact frame is provided with first and second guide grooves extending in the introduction direction of the movable contact, and the first fixed terminal piece is provided with the first guide from a side opposite to the introduction direction. The second fixed terminal piece is inserted and fixed in the groove, and the second fixed terminal piece is inserted and fixed in the second guide groove from the introduction direction.

In this case, the first fixed terminal piece is inserted and fixed on the coil side of the movable contact, and the second fixed terminal piece is inserted and fixed on the opposite side of the movable contact to the coil side. Preferably.

Further, between the insertion portion of the first fixed terminal piece into the contact frame and the external terminal portion exposed to the outside, the contact is made in the extending direction of the external terminal portion with respect to the contact frame. It is preferable to provide a supporting surface portion that contacts.

[0010]

According to the first aspect of the present invention, by mounting both the first and second fixed terminal pieces on the contact frame, the positional accuracy of the fixed contact with respect to the spool can be defined by the structure of the contact frame. And a first fixed terminal piece and a second fixed terminal piece can be obtained.
Since the first and second guide grooves extending in the introduction direction of the movable contact are configured to be inserted and fixed in mutually opposite directions, the assembly of the contact frame can be facilitated without complicating the structure of the contact frame. You can

According to the second aspect, by inserting and fixing the first fixed terminal piece on the coil side and the second fixed terminal piece on the non-coil side, the second fixed terminal piece is attached after the movable contact is mounted. Even if there is, it can be easily installed from the side opposite the coil,
It is possible to simplify the mounting structure of the second fixed terminal piece that is introduced from the same direction as the movable contact, or to simplify the step of mounting the second fixed terminal piece.

According to the third aspect, by providing the support surface portion between the insertion portion of the first fixed terminal piece and the external terminal portion, the support surface portion can be formed even when stress is applied to the external terminal portion during assembly or the like. Since it is supported by the contact frame, stress is less likely to be transmitted to the insertion portion inserted in the contact frame, and deformation of the contact portion is prevented.

[0013]

Embodiments of the electromagnetic relay according to the present invention will now be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing the structure of the electromagnetic relay of this embodiment, including a spool 2 around which the electromagnetic coil 1 is wound, an iron core 3 through which the spool 2 is inserted, and a yoke 4 connected to the iron core 3. A movable contact spring 5 made of an elastic plate having one end attached to the yoke 4, a movable piece 6 attached to the movable contact spring 5, and a contact frame 21 having a square cross section formed integrally with the spool 2. Two fixed terminal pieces 8 and 10 inserted and fixed inside the contact frame 21 and a coil terminal piece 12 connected to the electromagnetic coil 1 are provided.

Not shown in FIG. 1 are the other coil terminal piece 16 shown in FIG. 5 and the common terminal piece 17 attached to the yoke 4. The movable contact 7 is attached to the tip of the movable contact spring 5, the fixed a terminal 9 is attached to the fixed terminal piece 8, and the fixed b terminal 11 is attached to the fixed terminal piece 10. The fixed terminal pieces 8 and 10 are inserted into the guide grooves 21b and 21c formed on the inner surface of the through hole 21a provided in the contact frame 21 so that the fixed a terminals 9 and 11 face the movable contact 7. , Fixed in place.

After these parts are assembled together, a box-shaped cover member 13 made of synthetic resin and a base member 14 attached to the cover member 13 so as to insert the above-mentioned five terminals are hermetically sealed. To be done. In order to prevent the deformation of each terminal piece due to the stress generated at the time of inserting the base member 14, the fixed terminal piece 8 is provided with a support surface portion 81 that abuts the convex surface portion 22 formed on the bottom surface of the contact frame 21, The support surface portion 81 is formed between a connection arm portion 82 that connects the support surface portion 81 and the mounting surface of the fixed a contact 9 in a U-shape, and an external terminal portion 83 that extends downward. Further, the coil terminal piece 12 can be opposed to the stress applied from the outside in the same manner as above by contacting the lower end portion of the support rod portion 23 extending vertically downward from the lower collar portion 2c of the spool 2. It has become.

FIG. 2 shows a spool 2 in a state in which the electromagnetic coil 1 of this embodiment is wound. It has a center hole 2a formed so as to vertically penetrate therethrough and the iron core 3 is inserted therethrough, and a spool. It has flange parts 2b and 2c formed above and below the formed electromagnetic coil 1. A concave portion 24 for fitting the yoke 4 is formed on the surface of the flange portion 2b formed on the upper portion, and the end portion of the electromagnetic coil 1 is connected to the coil terminal piece 12,
A pair of coil pins 15, 15 attached to 16 are inserted and fixed from the side surfaces thereof.

The flange 2c formed in the lower portion of the spool 2 is integrally formed with the contact frame 21 below the flange 2c, and a guide groove extending horizontally is formed in the upper and lower inner surface portions of the through hole 21a therein. 21b and 21c are formed. A pair of split groove portions 25, 25 are formed on both side surfaces of the contact frame 21,
The intermediate portions of the coil terminal pieces 12 and 16 are inserted and fixed here. Further, a pair of left and right support rods 23, 23 is formed below the bottom surface of the collar portion 2c on the side opposite to the position where the contact frame 21 is formed, and one support rod 2 is formed.
3 (shown in FIG. 1) is the coil terminal piece 12 as described above.
And the other support rod 23 (shown in FIG. 2) abuts the overhanging portion 17a of the common terminal piece 17 shown in FIG.
The common terminal piece 17 is adapted to be supported against the stress in its extension direction.

FIG. 3 shows the shape of the fixed terminal pieces 8 and 10. The fixed terminal piece 8 is provided with a flat plate portion 84 that carries the fixed a-contact 9, a connecting arm portion 82, a support surface portion 81, and an external terminal portion 83. A pair of left and right engaging step portions 84a and 84b are formed on the side surface of the flat plate portion 84, and the flat plate portion 84
When is pressed into the guide groove 21b of the contact frame 21, the fixed terminal piece 8 can be firmly fixed to the contact frame 21 by engaging with the inner surface of the guide groove 21b.

When the fixed terminal piece 8 is press-fitted into the guide groove 21b, the horizontally formed supporting surface portion 81 abuts on the convex surface portion 22 formed on the bottom surface of the contact frame 21 shown in FIG. The portion 83 is adapted to be supported in its extension direction. Here, the stress applied to the external terminal portion 83 is equal to the supporting surface portion 8
Since it is received between 1 and the convex surface portion 22, the stress is not transmitted to the flat plate portion 84 via the connecting arm portion 82.

The connecting arm portion 82 electrically connects the flat plate portion 84 to which the fixed a terminal 9 is attached and the external terminal portion 83, but it does not close the peripheral side opening of the through hole 21a of the contact point frame 21. Further, as described above, the stress applied to the external terminal portion 83 is transmitted to the flat plate portion 84 as little as possible, so that it is formed in a narrow width. The opening on the peripheral side of the through hole 21a is the spool 2
It is necessary to perform the operation test of the contact part and the measurement of the contact pressure at the time when the assembling of each of the terminal pieces and each terminal piece is completed.

On the other hand, the fixed terminal piece 10 has a fixed b-contact 11
And a flat plate portion 101 configured to be pressed into the guide groove 21c of the contact frame 21
And an external terminal portion 102 that is bent vertically and extends downward. The flat plate portion 101 is formed with a push-out portion 103 protruding downward in a rectangular shape next to the mounting position of the fixed b terminal 11. The extruded portion 103 is formed by pressing so as to have a rectangular hill shape protruding from the bottom surface of the flat plate portion 101 by a predetermined thickness.

When the flat plate portion 101 is press-fitted into the guide groove 21c, the engaging step 101 formed on the side surface of the flat plate portion 101.
The a and 101b engage with the inner surface of the guide groove 21c so that the fixed terminal piece 10 can be firmly fixed to the contact frame 21. When the fixed terminal piece 10 is press-fitted to the predetermined position in the contact frame 21, the side surface of the push-out portion 103 on the fixed b contact 11 side collides with the opening edge of the through hole 21a of the contact frame 21, as shown in FIG. The fixed b-contact 11 is surely positioned.

As shown in FIG. 4, the fixed terminal pieces 8 and 10 are press-fitted into the guide grooves 21b and 21c from the left and right opposite sides of the contact frame 21, respectively, and fixed a contact 9 and fixed b are attached to the guide grooves 21b and 21c, respectively. The contacts 11 are fixed in a state of being arranged opposite to each other. In this case, as shown in FIG.
The movable contact 7 formed at the tip of the
Although it is arranged between the contacts 11, the fixed b contact 11 introduced from the same side as the movable contact 7 with respect to the contact frame 21 is arranged on the side opposite to the electromagnetic coil 1, and therefore is attached to the contact frame 21. If the moving contact spring 5 and the fixed terminal piece 10 are carried out in this order, the assembly is easy without being interfered with each other.

FIG. 5 shows the shapes of the coil terminal piece 12 and the other coil terminal piece 16 and common terminal piece 17 not shown in FIG. Coil pin 15
On the other hand, a connection part 121 connected by solder or the like, and an upper piece part 122 formed slightly wider than the connection part 121,
The horizontal piece 123 is connected to the upper piece 122 and extends horizontally, and the external terminal 124 is connected to the horizontal piece 123 and extends downward via the bent portion 12a. As for the horizontal piece 123 of the coil terminal piece 12, the supporting rod portion 23 abuts on the upper side surface thereof, and the projection 12b formed on the lower side surface thereof abuts on the inner surface of the base 14, whereby the cover member 13 is formed. Also, it is fixed in the horizontal direction inside the case body composed of the base member 14. The parallel protrusion 12 is formed on the base of the external terminal portion 124.
c is formed, and the parallel protrusions 12c are formed on the base member 14
With the external terminal portion 124 protruding from the outside, the coil terminal piece 12 is fixed to the base member 14 by being crimped from the outside to the base member 14.

The coil terminal piece 16 is arranged on the front side of the external terminal portion 83 of the fixed terminal piece 8 in the state shown in FIG. 1, and is different from the coil pin 15 attached to the collar portion 2b of the spool 2. A connecting portion 161 connected by solder or the like, an upper piece 162 that is formed slightly wider than the connecting portion 161 and extends downward, and an external terminal portion that extends downward from the upper piece 162 via the bent portion 16a. 163
Have and. The lower portion of the upper piece 162 is inserted into the above-mentioned split groove portion 25 provided on the spool 2, and at this time, the bent portion 16a thereof is formed on the convex surface portion 26 formed on the bottom surface of the contact frame 21 as shown in FIG. It comes into contact. Therefore, even if the external terminal portion 163 receives stress in the extension direction, the bent portion 16 a is supported by being in contact with the convex surface portion 26.

The common terminal piece 17 is arranged in front of the external terminal portion 124 of the coil terminal piece 12 in the state shown in FIG. 1, and has a side surface on a protrusion (not shown) formed on the yoke 4 shown in FIG. And a mounting portion 171 having a fitting hole 17d that is fitted from the side and fixed by caulking, and the mounting portion 1
An upper piece 172 that extends downward following 71 is provided, and an external terminal portion 173 that is connected to the upper piece 172 via the bent portion 17b. The above-mentioned overhanging portion 17a is formed in the lower portion of the upper piece 172, and the parallel protrusion 17c is provided at the base of the external terminal portion 173. The parallel protrusions 17c are for caulking and fixing to the base member 14 like the parallel protrusions 12c.

In the present embodiment constructed as described above, the fixed contacts 9 and 11 for the spool 2 are obtained by inserting and fixing the fixed terminal pieces 8 and 10 in the contact frame 21.
Since the position accuracy of the contact point can be defined by the structure of the contact frame 21, a highly accurate contact structure can be obtained, and the fixed terminal pieces 8 and 10 are extended in the guide direction 21b of the movable contact 7. , 21c are inserted and fixed in opposite directions to each other, the assembly can be facilitated without complicating the structure of the contact frame 21.

Further, the fixed terminal piece 8 is provided on the electromagnetic coil 1 side,
By inserting and fixing the fixed terminal piece 10 on the anti-electromagnetic coil side, the fixed terminal piece 10 can be easily attached from the anti-electromagnetic coil side even after the movable contact 7 is attached. The mounting structure of the fixed terminal piece 10 introduced from the direction can be simplified or the mounting process of the fixed terminal piece 10 can be facilitated.

In this embodiment, since all the terminal pieces are attached and fixed to the spool 2 as described above,
The attachment of the base member 14 does not change the actual configuration of the electromagnetic relay, and has an advantage that an operation test and a durability test can be effectively performed. In particular, the base member 14
On the other hand, there is almost no need to perform crimp fixing which has been conventionally performed, and the step of sealing the terminal piece is facilitated. Also, regarding the contact structure, since the position of the fixed contact does not change due to the attachment of the base member 14, the assembly is easy,
We can make products with stable quality.

Further, by providing the supporting surface portion 81 between the flat plate portion 84 of the fixed terminal piece 8 and the external terminal portion 83,
Even when stress is applied to the external terminal portion 83 at the time of assembly or the like, the support surface portion 81 is supported by the contact frame 21, so that the stress is difficult to be transmitted to the flat plate portion 84 inserted into the contact frame 21, and the contact portion is deformed. Is prevented.

In the above embodiment, the coil terminal piece 12 is contacted to the horizontal piece 123 by the support rod 23, and the coil terminal piece 16 is contacted to the bent portion 16a.
The first convex portion 26 further improves the rigidity of the common terminal piece 17 with respect to the stress applied to the external terminal portions 124, 163, 173 by the other support rod portion 23 that abuts the projecting portion 17a. Since each of these terminal pieces including the fixed terminal piece is attached to the spool 2 and an auxiliary supporting portion is also provided to the spool 2, most of the terminal piece depends on the case body. It has succeeded in significantly increasing the rigidity against external stress.

[0032]

As described above, the present invention has the following effects. According to the first aspect, by mounting both the first and second fixed terminal pieces on the contact frame, the positional accuracy of the fixed contact with respect to the spool can be defined by the structure of the contact frame. Therefore, a highly accurate contact structure. In addition, the first fixed terminal piece and the second fixed terminal piece can be inserted and fixed from the opposite directions to the first and second guide grooves extending in the introduction direction of the movable contact. With this configuration, the assembly can be facilitated without complicating the structure of the contact frame.

According to the second aspect, by inserting and fixing the first fixed terminal piece on the coil side and the second fixed terminal piece on the non-coil side, after the second fixed terminal piece is attached to the movable contact. Even if there is, it can be easily installed from the side opposite the coil,
It is possible to simplify the mounting structure of the second fixed terminal piece that is introduced from the same direction as the movable contact, or to simplify the step of mounting the second fixed terminal piece.

According to the third aspect, by providing the support surface portion between the insertion portion of the first fixed terminal piece and the external terminal portion, the support surface portion can be formed even if stress is applied to the external terminal portion during assembly or the like. Since it is supported by the contact frame, stress is less likely to be transmitted to the insertion portion inserted in the contact frame, and deformation of the contact portion is prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a structure of an embodiment of an electromagnetic relay according to the present invention.

FIG. 2 is a perspective view showing a shape of a spool in the embodiment.

FIG. 3 is a perspective view showing a shape of a pair of fixed terminal pieces in the embodiment.

FIG. 4 is an explanatory view showing a method of attaching a pair of fixed terminal pieces to a contact frame in the same embodiment.

FIG. 5 is a front view showing the shapes of a coil terminal piece and a common terminal piece in the embodiment.

[Explanation of symbols]

 1 Electromagnetic Coil 2 Spool 3 Iron Core 4 Yoke 5 Moving Contact Spring 6 Moving Piece 7 Moving Contact 8, 10 Fixed Terminal Piece 9 Fixed a Contact 11 Fixed b Contact 12, 16 Coil Terminal Piece 13 Cover Member 14 Base Member 17 Common Terminal Piece 21 contact frame 21a through hole 21b, 21c guide groove 22 convex surface portion 81 supporting surface portion

Claims (3)

[Claims] 1. A first coil having a first fixed contact so that a spool wound with a coil is provided with first and second fixed contacts that face each other with the introduced movable contact interposed therebetween. In an electromagnetic relay integrally provided with a fixed terminal piece and a contact frame for supporting and fixing the second fixed terminal piece having the second fixed contact, the contact frame extending in the introduction direction of the movable contact. First and second guide grooves are provided, the first fixed terminal piece is inserted and fixed in the first guide groove from the side opposite to the introducing direction, and the second fixed terminal piece is inserted from the introducing direction. The second
An electromagnetic relay characterized by being inserted and fixed in the guide groove of. 2. The first fixed contact according to claim 1, wherein the first fixed contact is fixed to the coil side with respect to the movable contact, and the second fixed contact is fixed to a side opposite to the coil side with respect to the movable contact. An electromagnetic relay that is characterized by 3. The method according to claim 1, wherein the external terminal portion is provided with respect to the contact frame between the insertion portion of the first fixed terminal piece into the contact frame and the external terminal portion exposed to the outside. An electromagnetic relay comprising a support surface portion that abuts in a stretching direction.