JP3130221B2 - Electromagnetic relay - Google Patents

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 formed 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 for winding a coil, an iron core inserted into a center hole formed in the spool, a yoke connected to the iron core, and hingedly connected to the yoke. A movable piece, a movable contact spring elastically connecting the movable piece to the yoke and having a movable contact at a tip thereof, and a pair of fixed terminal pieces having fixed contacts opposed to the movable contact. There is a hinge type electromagnetic relay.

[0003] There are various types of hinge type electromagnetic relays, some of which include a contact frame integrally formed with the spool. The contact frame is formed on a flange portion of the spool, and is configured to insert and fix fixed contacts formed on a pair of fixed pieces in two upper and lower stages. 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 movable contact spring is introduced from the side different from the direction of introduction of the movable contact spring with respect to the contact frame. A fixed terminal piece is inserted, and one fixed contact is fixed by a base.
However, these structures are convenient at the time of assembling.However, in the former method, since the fixed terminal pieces are attached to the side, it is difficult to arrange the coil terminal pieces and the like, and a sufficiently small relay can be achieved. There is a problem that the contact frame cannot be formed, and the structure of the contact frame is complicated. Also, the latter method has a problem that the operation test is difficult because the contact portion is not formed unless the base is attached, and the contact accuracy is affected by the attachment accuracy of the base.

Further, in a relay having a structure in which a contact portion is provided on the base side with respect to the coil, a terminal piece cannot be normally fixed to a spool or the like. Therefore, a part of the fixed contact and each terminal piece are fixed by the base. It is necessary to caulk and fix each terminal to a terminal hole formed in the base. However, such fixing by caulking is a complicated operation and hinders simplification of the manufacturing process, and it is difficult to secure a strength against a high load, particularly a load in a direction of inserting the terminal into the base, by fixing the terminal in the terminal hole. There is a problem that is.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to make it possible to obtain a contact structure of an electromagnetic relay, which can be reduced in size and secure the accuracy of the contact portion, through an efficient manufacturing process. It is desirable to realize a structure having high terminal strength without fixing each terminal piece to the base.

[0007]

Means taken by the present invention for solving the above-mentioned problems are as follows: a first and a second opposed to each other with a movable contact inserted therebetween on a spool wound with a coil. A contact frame for supporting and fixing the first fixed terminal piece provided with the first fixed contact and the second fixed terminal piece provided with the second fixed contact is provided integrally so as to dispose the fixed contact. In the electromagnetic relay, the contact frame is provided with first and second guide grooves extending in a direction in which the movable contact is introduced, and the first fixed terminal piece is connected to the first guide from a side opposite to the direction in which the movable contact is introduced. And inserting and fixing the second fixed terminal piece into the second guide groove from the introduction direction.

In this case, the first fixed terminal piece is inserted and fixed on the coil side with respect to the movable contact, and the second fixed terminal piece is inserted and fixed on the opposite side with respect to the movable contact with the coil side. Is preferred.

[0009] Further, between the portion of the first fixed terminal piece inserted into the contact frame and the external terminal portion exposed to the outside, the first fixed terminal piece contacts the contact frame in the extending direction of the external terminal portion. It is preferable to provide a supporting surface portion that is in contact.

[0010]

According to the first aspect, since the first and second fixed terminal pieces are attached to the contact frame together, the positional accuracy of the fixed contact with respect to the spool can be defined by the structure of the contact frame, so that high accuracy is achieved. Can be obtained, and the first fixed terminal piece and the second fixed terminal piece are
The first and second guide grooves, which extend in the direction of introduction of the movable contact, are inserted and fixed in opposite directions, thereby facilitating assembly without complicating the structure of the contact frame. Can be.

According to the second aspect, the first fixed terminal piece is inserted and fixed on the coil side, and the second fixed terminal piece is inserted and fixed on the opposite side of the coil. Even if there is, it can be easily installed from the opposite side of the coil,
The mounting structure of the second fixed terminal piece introduced from the same direction as the movable contact can be simplified, or the mounting process of the second fixed terminal piece can be simplified.

According to the third aspect of the present invention, the support surface portion is provided between the insertion portion of the first fixed terminal piece and the external terminal portion, so that the support surface portion is provided 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 hardly transmitted to the inserted portion inserted into the contact frame, and deformation of the contact portion is prevented.

[0013]

Next, an embodiment of an electromagnetic relay according to the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing the structure of the electromagnetic relay according to the present embodiment, in which a spool 2 around which an 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 are shown. 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 formed integrally with the spool 2 and having a rectangular cross section. 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.

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

After these components are assembled with each other, they are sealed by a box-shaped cover member 13 made of synthetic resin and a base member 14 attached to the cover member 13 so that the five terminals can be inserted therethrough. Is done. In order to prevent the deformation of each terminal strip due to the stress generated when the base member 14 is inserted, the fixed terminal strip 8 is provided with a support surface portion 81 which comes into contact with the convex surface portion 22 formed on the bottom surface of the contact frame 21; The support surface 81 is formed between a connection arm 82 that connects the support surface 81 and the mounting surface of the fixed a-contact 9 in a U-shape, and an external terminal 83 that extends downward. In addition, the coil terminal strip 12 abuts on the lower end of the support rod 23 extending vertically downward from the lower flange 2c of the spool 2 so as to be able to oppose the externally applied stress as described above. It has become.

FIG. 2 shows a spool 2 in a state in which the electromagnetic coil 1 of this embodiment is wound. The spool 2 has a center hole 2a which penetrates vertically and is formed so that the iron core 3 is inserted therethrough. And a flange portion 2b, 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 at the top, and the ends of the electromagnetic coil 1 are connected to the coil terminal pieces 12,
A pair of coil pins 15, 15 attached to 16 are inserted and fixed from the side surfaces thereof.

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

FIG. 3 shows the shapes of the fixed terminal pieces 8 and 10. The fixed terminal piece 8 includes a flat plate portion 84 carrying the fixed a contact 9, the connecting arm portion 82, the support surface portion 81, and the external terminal portion 83. A pair of left and right engaging step portions 84a and 84b is formed on the side surface of the flat plate portion 84.
Is pressed into the guide groove 21b of the contact frame 21 so as to engage with the inner surface of the guide groove 21b so that the fixed terminal piece 8 can be firmly fixed to the contact frame 21.

When the fixed terminal piece 8 is press-fitted into the guide groove 21b, the horizontally formed support surface portion 81 comes into contact with the convex portion 22 formed on the bottom surface of the contact frame 21 shown in FIG. The portion 83 is supported in the extension direction. Here, the stress applied to the external terminal portion 83 is
1 and the convex 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 mounted and the external terminal portion 83. However, since the peripheral opening of the through hole 21a of the contact frame 21 is not closed, In addition, as described above, in order to minimize the transmission of the stress applied to the external terminal portion 83 to the flat plate portion 84, it is formed to be narrow. The peripheral side opening of the through hole 21a is
It is necessary to perform the operation test of the contact portion and the measurement of the contact pressure at the time when the assembly with the terminal pieces is completed.

On the other hand, the fixed terminal piece 10 is
And a flat plate portion 101 configured to be pressed into the guide groove 21 c of the contact frame 21 and a flat plate portion 101.
And an external terminal portion 102 that bends vertically from and extends downward. An extruded portion 103 is formed on the flat plate portion 101 and protrudes downward in a rectangular shape beside the mounting position of the fixed b terminal 11. The extruded portion 103 is formed by press working so as to form a rectangular hill projecting from the bottom surface of the flat plate portion 101 by a predetermined thickness.

When the flat plate portion 101 is pressed into the guide groove 21c, an engaging step 101 formed on the side surface of the flat plate portion 101 is formed.
a and 101b are engaged 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 a predetermined position in the contact frame 21, the side surface of the extruded portion 103 on the side of the fixed b contact 11 collides with the opening edge of the through hole 21 a of the contact frame 21, as shown in FIG. The fixed b contact 11 is reliably 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 with respect to the contact frame 21, respectively. The contact 11 is fixed in a state where it is opposed to the contact. In this case, as shown in FIG.
The movable contact 7 formed at the tip of the fixed a contact 9 and the fixed b
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 opposite side to the electromagnetic coil 1, so that it is attached to the contact frame 21. If the above operation is performed in the order of the movable contact spring 5 and the fixed terminal strip 10, the assembly is easy without mutual interference.

FIG. 5 shows the shape of the other coil terminal piece 16 and common terminal piece 17 not shown in FIG. Coil pin 15
A connecting portion 121 connected to the connecting portion by solder or the like, an upper piece portion 122 formed slightly wider than the connecting portion 121,
It comprises a horizontal piece 123 connected to the upper piece 122 and extending horizontally, and an external terminal 124 connected to the horizontal piece 123 and extending downward through the bent portion 12a. The horizontal piece portion 123 of the coil terminal piece 12 has a cover member 13 formed by abutting the support rod portion 23 on the upper surface thereof and the projecting portion 12b formed on the lower surface thereof abutting on the inner surface of the base 14. And is fixed in the horizontal direction inside the case body composed of the base member 14. The base of the external terminal portion 124 has a parallel protrusion 12
c is formed, and the parallel projection 12c is
In a state where the external terminal portion 124 is projected from the base member 14, the coil terminal piece 12 is fixed to the base member 14 from the outside by caulking against the base member 14.

The coil terminal strip 16 is disposed in front of the external terminal section 83 of the fixed terminal strip 8 in the state shown in FIG. A connection portion 161 connected by solder or the like, an upper piece 162 formed to be slightly wider following the connection 161 and extending downward, and an external terminal portion extending downward from the upper piece 162 via the bent portion 16a 163
And The lower part of the upper piece 162 is inserted into the split groove 25 provided on the spool 2, and at this time, the bent portion 16 a is formed on the convex portion 26 formed on the bottom surface of the contact frame 21 as shown in FIG. 2. It will be in contact. Therefore, even if the external terminal portion 163 receives the 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 strip 17 is arranged on the near side of the external terminal section 124 of the coil terminal strip 12 in the state shown in FIG. 1, and has a side surface formed on a projection (not shown) formed on the yoke 4 shown in FIG. A mounting portion 171 having a fitting hole 17d fitted from the side and fixed by caulking;
It has an upper piece 172 that extends downwardly following 71 and an external terminal 173 connected to the upper piece 172 via a bent portion 17b. The projecting portion 17a described above is formed below the upper piece portion 172, and a parallel projection 17c is provided at the base of the external terminal portion 173. The parallel projection 17c is for caulking and fixing to the base member 14, similarly to the parallel projection 12c.

In this embodiment constructed as described above, the fixed terminal pieces 8 and 10 are both inserted and fixed in the contact frame 21 so that the fixed contacts 9 and 11 to the spool 2 are fixed.
Position accuracy can be defined by the structure of the contact frame 21, so that a high-precision contact structure can be obtained, and the fixed terminal strips 8 and 10 are extended in the guide groove 21b extending in the introduction direction of the movable contact 7. , 21c are inserted and fixed in opposite directions, so that the structure of the contact frame 21 can be simplified and the assembly can be facilitated.

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

In this embodiment, since all the terminal pieces are fixed to the spool 2 as described above,
The mounting of the base member 14 does not change the actual configuration of the electromagnetic relay, and has an advantage that an operation test, a durability test, and the like can be performed effectively. In particular, the base member 14
In contrast, there is almost no need to perform the caulking fixation conventionally performed, and the sealing process of the terminal pieces becomes easy. 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 stable quality products.

Further, by providing a support 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 during assembly or the like, the support surface portion 81 is supported by the contact frame 21, so that stress is not easily 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 strips 12 are supported by the support rods 23 which are in contact with the horizontal strips 123, and the coil terminal strips 16 are in contact with the contact frames 2 which are in contact with the bent portions 16a.
Due to the one convex surface portion 26, the common terminal strip 17 further improves the rigidity against the stress applied to the external terminal portions 124, 163, 173 by the other supporting rod portion 23 abutting on the overhang portion 17 a. Since each of these terminal pieces including the fixed terminal piece is attached to the spool 2 and an auxiliary supporting portion is also made to the spool 2, most of the parts depending on the case body are provided. Instead, it succeeded in significantly increasing the rigidity against external stress.

[0032]

As described above, according to the present invention, the following effects can be obtained. According to the first aspect, since the first and second fixed terminal pieces are attached to the contact frame together, the positional accuracy of the fixed contact with respect to the spool can be defined by the structure of the contact frame. So that the first fixed terminal piece and the second fixed terminal piece are inserted and fixed from opposite directions to the first and second guide grooves extending in the direction of introduction 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, the first fixed terminal piece is inserted and fixed on the coil side, and the second fixed terminal piece is inserted and fixed on the opposite side of the coil. Even if there is, it can be easily installed from the opposite side of the coil,
The mounting structure of the second fixed terminal piece introduced from the same direction as the movable contact can be simplified, or the mounting process of the second fixed terminal piece can be simplified.

According to the third aspect of the present invention, the support surface portion is provided between the insertion portion of the first fixed terminal piece and the external terminal portion, so that the support surface portion is provided 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 hardly transmitted to the inserted portion inserted into the contact frame, and deformation of the contact portion is prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the 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 embodiment.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic coil 2 Spool 3 Iron core 4 Yoke 5 Movable contact spring 6 Movable piece 7 Movable 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 DESCRIPTION OF SYMBOLS 21 Contact frame 21a Through hole 21b, 21c Guide groove 22 Convex surface 81 Support surface

Claims (3)

(57) [Claims] A first fixed contact provided with a first fixed contact so that first and second fixed contacts facing each other with a movable contact inserted therebetween are disposed on a spool around which a coil is wound. An electromagnetic relay integrally provided with a fixed terminal piece and a contact frame for supporting and fixing the second fixed terminal piece provided with the second fixed contact, wherein the contact frame is extended in an introduction direction of the movable contact. First and second guide grooves are provided, and the first fixed terminal piece is inserted and fixed in the first guide groove from a side opposite to the introduction direction, and the second fixed terminal piece is inserted from the introduction direction. The second
An electromagnetic relay characterized in that it is inserted and fixed in a guide groove. 2. The 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 characterized by: 3. The external terminal portion according to claim 1, wherein the external terminal portion is provided between the insertion portion of the first fixed terminal piece into the contact frame and an external terminal portion exposed to the outside. An electromagnetic relay, comprising a support surface portion abutting in a stretching direction.