JPH11154451A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide desired insulation between a contact switching mechanism and a coil block even though the device is small sized. SOLUTION: A base block 21 has a rectangular flat plate shape wherein fixed terminals 22 is formed by insert molding so that fixed contacts are exposed to a top surface. An electromagnet block 40 is constituted so that an armature block 51 is mounted on a coil block 41, and the electromagnet block 40 is disposed on the base block 21. An insulating plate 31 is disposed between contact switching mechanism 22, 23 of the base block 21 and the electromagnet block 30, then the insulating plate 31 and the side edge of the base block 21 cover the top and bottom and width direction of the contact switching mechanism 22, 23. while protrusions 31a of both ends of the insulating plate 31 are set longitudinally long for insulation.

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 very small electromagnetic relay.

[0002]

2. Description of the Related Art Conventionally, in order to reduce the size of an electromagnetic relay, a configuration in which a contact opening / closing mechanism is provided on the upper surface of a base and an electromagnet block is further provided thereon has been considered. For example, see JP-A-64-89129).

[0003]

In general, electromagnetic relays require a predetermined insulating property between the contact opening / closing part and the electromagnet block. However, in the above-mentioned type of electromagnetic relay, such a desired insulating property is required. The structure to obtain is not adopted.

[0004] Therefore, an object of the present invention is to provide an electromagnetic relay capable of obtaining desired insulation even if it is small.

[0005]

According to the present invention, as a means for solving the above-mentioned problems, a fixed terminal is insert-molded on an electromagnetic relay so that the fixed contact is exposed on an upper surface, and the electromagnetic relay is connected to and separated from the fixed contact. A flat base block with a contact opening / closing mechanism with a movable contact piece with a movable contact, and a hinge spring integrated with the movable iron piece above a coil block with a coil wound around an iron core provided on a spool The movable contact piece is formed by mounting a converted armature block, is disposed above the base block, and rotates the movable iron piece based on the excitation and demagnetization of the coil block to thereby move the movable contact piece through a card. An electromagnet block for driving the contact opening / closing mechanism is disposed between the electromagnet block and the contact opening / closing mechanism of the base block. Covers the width direction is obtained by a structure in which an insulating plate to increase the longitudinal direction of the insulating distance protruding portions at both ends.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show an example of an electromagnetic relay according to the present invention, and are exploded perspective views seen from above and below, respectively. This electromagnetic relay generally includes a base block 20, an insulating block 30, and an electromagnet block 40.
And a case 60.

The base block 20 comprises a base 21 having a first fixed terminal 22 and a movable contact piece 23 as a contact opening / closing mechanism.
In addition, the common terminal 24 is integrated.

The base 21 is formed in a substantially rectangular plate shape in a plan view. As shown in FIGS. 5 and 6, a rib 33 having a substantially U-shape in a plan view is protruded from one end side edge. Also, rib 3
In the vicinity of 3, the first fixed terminals 22 are arranged side by side at four places in the width direction and integrated. Each first fixed terminal 22 includes a first fixed contact 22 a exposed on the upper surface of the base 21 and first terminal portions 22 b protruding from both lower surfaces of the base 21.
Each first fixed contact 22a extends in the width direction of the base 21,
A creepage distance is provided between each of them by a groove 26 formed in the base 21. Thereby, the density of the first fixed contact 22a is increased. Further, on both side edges of the base 21, a locking relief portion 27 adjacent to both ends of the rib 25 and an insertion hole 28 located near the locking relief portion 27 are formed.

On the other hand, a total of four common terminals 24 are provided at the other end of the base 21. Each common terminal 24
Has a welded portion 24a projecting from the upper surface of the base 21 and juxtaposed in the width direction, and terminal portions 24b projecting from both sides of the lower surface of the base 21. One end of the movable contact piece 23 is welded to each of the welding portions 24a. The free end of each movable contact piece 23 is bifurcated, and the movable contacts 23a and 23b are fixed respectively. The movable contact 23a is formed on the upper surface of the movable contact piece 23 located at two places on both sides. The movable contact 23b is formed on the lower surface of each movable contact piece. Further, positioning notches 23c are formed at the tips of the movable contact pieces 23 located at two places on both sides. A guide portion 29 protrudes upward from both edges of the other end of the base 21, and an insulating plate locking concave portion 29 a is formed therein. In addition, a coil block locking recess 21a is formed on the lower edge thereof (see FIG. 2). The base 21 has a recess 21b in a predetermined area including the protruding terminal portions 22b and 24b.
(See FIG. 18). This recess 21b
This is for suppressing the amount of the sealant used.

The insulating block 30 has a rectangular plate-like insulating plate 3.
1, a pair of second fixed terminals 32 are integrated.

As shown in FIG. 7, ribs 33 project upward from both side edges of the insulating plate 31, and a mounting portion 34 for mounting the second fixed terminal 32 downward is provided. , Insulating recess 2 for insulating plate of base 21
An engagement portion 35 that engages with 9a is protruded. The ribs 33 are connected to the respective contacts 22a, 23a, 32
This is for improving the insulation property by increasing the creepage distance between a and the coil 50. The mounting portion 34 has a rectangular hole 34a. In addition, protruding portions 31a are protruded from both ends of the insulating plate 31. Further, on the lower surface of the insulating plate 31, a portion adjacent to each mounting portion 34 is one step higher than other portions. Also, there is a bulge 3
6 (see FIG. 2). The bulging portion 36 has a fitting concave portion 36a that opens toward the rectangular hole 34a.

The second fixed terminal 32 has a rectangular plate shape, a second fixed contact 32a (see FIG. 2) formed on the lower surface, and a second terminal portion 32b extending downward. The second fixed terminal 32 includes the second terminal portion 32.
Notches 32c are formed on both sides of the base of b. The notch 32c allows the second fixed terminal 32 to be connected to the mounting portion 34.
Plays a role of generating a predetermined elastic force when pressed into the rectangular hole 34a. Further, the second fixed terminal 32 has a second
On the side opposite to the terminal portion 32b, a fitting projection 32d is formed to fit into the fitting concave portion 36a of the bulging portion 36 (see FIG. 7).

The electromagnet block 40 includes the coil block 4
1 and an armature block 51.

The coil block 41 has a core 42 provided on a spool 42 and a coil 50 (see FIG. 12) wound thereon.

As shown in FIG. 10, the spool 42 has a first flange 44 and a second flange 47 at both ends of a body 43, respectively. The body 43 has a plate shape, and the upper surface is depressed except for both side edges, and a locking projection 43a is formed inward at the center of both sides. The first flange portion 44 is provided with legs 45 projecting downward. An engagement claw 45a is formed on the front end facing surface of each leg 45 to engage with the locking relief portion 27 of the base 21. A guide recess 46 is formed at the center of the upper surface of the first flange 44, and guide protrusions 46a are formed on both sides thereof so as to be substantially U-shaped. On the other hand, guide walls 47a are erected at predetermined intervals on the second flange portion 47, and coil terminals 48 are press-fitted on both sides thereof. A window 47b (see FIG. 16) is provided below the second flange 47.
Are formed. A locking projection 47c is formed on the inner edge of the lower end forming the window 47b. Locking projection 47
c is a coil block locking recess 21 of the base 21.
a.

As shown in FIG. 10, the iron core 49 is formed by bending a magnetic plate material into a substantially U-shape and further bending both ends of the magnetic plate horizontally outward, thereby forming a suction portion (magnetic pole portion) 49 at one end.
a, an attracting portion (magnetic pole portion) 49b is formed on the other end side. The central portion of the iron core 49 is placed on the upper surface of the spool 42, and both sides thereof are supported by the projections 43a.
At this time, the suction part 49 a of the iron core 49 is guided by the guide recess 46 of the first flange part 44 of the spool 42. Also,
The suction portion 49b is guided by the guide walls 47a (both sides) of the second flange portion 47, and a gap (snap-fit portion A) is formed between the two (between the end surface of the spool 42 and the end surface of the suction portion 49b). (See FIG. 12).

The coil 50 is provided with a core 4
9 is placed around the body 43 of the spool 42 and the center of the iron core 49, and both ends are wound around the coil terminals 48, respectively.

The armature block 51 is obtained by integrating a movable iron piece 52 with a hinge spring 53.

As shown in FIG. 11, the movable iron piece 52 has a reduced thickness on both sides at one end, a notch 52a is formed therein, and a pair of caulking projections 52b is formed on the upper surface at the other end. ing.

The hinge spring 53 is formed by bending an elastic plate made of a rectangular frame at a substantially right angle, and caulking the caulking projection 52b of the movable iron piece 52 to the through hole 53a at one end, and engaging the tongue at the other end. 54 are formed.

As shown in FIG. 1, the card 55 has a plate shape made of a synthetic resin, and has substantially C-shaped elastic locking portions 56 formed on both upper sides thereof, and is locked by the notch 52a of the movable iron piece 52. It has become so. Locking projections 57 project downward from both sides of the lower portion of the card 55 so as to be locked in the positioning notches 23c of the movable contact piece 23, respectively.

The case 60 has a box shape with an open bottom.
As shown in FIG. 2, a plurality of reinforcing ribs 61 are formed at the boundary between the ceiling wall and the side wall. On the inner surface of the lower opening, locking projections 62 that are locked to the lower surface edge of the base 21 are formed at positions facing each other.
Note that 60a shown in FIG. 15 is a gas vent hole, which is sealed after the completion of the electromagnetic relay.

Next, a method of manufacturing the electromagnetic relay having the above configuration will be described.

In the processing of the base block 20, a strip-shaped metal plate is punched out by press working to form a lead frame 70 (see FIG. 3). In this lead frame 70,
First positioning holes 72 formed in both side edges 71
The fixed terminal 22 and the common terminal 24 are respectively formed at predetermined positions. Further, by the press working, the portion B of the first fixed terminal 22 to which the first fixed contact 22a is welded and the welded portion 24a of the common terminal 24 are bent into a predetermined shape. Further, first alignment holes 74 are formed at a predetermined pitch in the first connection portion 73 connecting the welded portions 24a to each other.

Subsequently, the lead frame 70 is positioned in a mold (not shown) using the positioning holes 72, and the base 21 is formed by injection molding (see FIG. 4). Then, from the lead frame 70, the first fixed terminal 2
2 and the respective terminal portions 22b, 24b of the common terminal 24 are cut and bent downward (see FIG. 5).

On the other hand, the movable contact piece 23 is formed by press working (see FIG. 5). One end of each movable contact piece 23 is bent upward. In this case, the movable contact pieces 23 located on both sides are movable contact pieces 23 located at two central positions.
It bends so that the bending angle becomes large as compared with.

The movable contact piece 23 is punched out with the other end side connected by a second connecting portion 75, and the second connecting portion 75 has a second position corresponding to the first alignment hole 74. 2
An alignment hole 76 is formed.

Then, the welding portion 24a of the common terminal 24 and the movable contact piece 23 are positioned so that the positioning holes 74 and 76 communicate with each other, and are integrated by welding.
Cut (see FIG. 6).

In the processing of the insulating block 30, the insulating plate 31 is formed by injection molding. Further, the second fixed terminal 32 is formed by press working. Then, the second fixed terminal 32
Through the rectangular hole 34a formed in the mounting portion 34 of the insulating plate 31 (see FIG. 7). Fitting protrusion 32 of second fixed terminal 32
d fits into the fitting recess 36a of the insulating plate 31. The second fixed terminal 32 itself is elastically deformed by the notch 32c and is press-fitted into the rectangular hole 34a. Thereby, the second fixed terminal 32 is fixed to the insulating plate 31 (see FIG. 8).

In processing the electromagnet block 40, the spool 42 is formed by injection molding. And the second flange 47
The coil terminal 48 is press-fitted. Further, an iron core 49 bent into a predetermined shape from above is placed. Then, spool 4
2 around the body 43 and the intermediate part of the iron core 49.
, And both ends are wound around each coil terminal 48.

In the processing of the armature block 51, the movable iron piece 52 and the hinge spring 53 are formed by pressing. Then, a hinge spring 53 is swaged and fixed to the movable iron piece 52.

The case 60 is formed by injection molding.

In this way, each of the blocks 20, 30, 4
0 and the case 60 are completed, the base block 2
The insulating block 30 is assembled from above to 0 (see FIGS. 8 and 9). In this case, by engaging the engaging portion 35 of the insulating plate 31 with the insulating plate locking concave portion 29a of the base 21, the two are easily integrated. In this state, the base 21
The contact opening and closing mechanism provided in the base 21 except for the longitudinal direction
And the insulating plate 31. In the assembly, the second terminal portion 32b of the second fixed terminal 32 is connected to the base 2
1 protrudes downward through the insertion hole 28 formed therein.

Next, a coil block 41 is mounted on the insulating block 30 from above (see FIG. 12). In this case, the movable contact piece 23 welded to the welding portion 24a of the common terminal 24 is inserted into the window 47b formed on the second flange portion 47 of the coil block 41 from an obliquely upper side so as to be inserted. After the locking projection 47c is locked to the coil block locking recess 21a, the locking claw 45 of the leg 45 is locked.
a is locked to the locking relief portion 27 (see FIG. 12). In this state, as described above, the contact opening and closing mechanism is
1 and the insulating plate 31 cover the area other than the longitudinal direction, so that desired insulation between the coil block 41 and the coil block 41 can be maintained. Also, in the longitudinal direction of the contact opening / closing mechanism, the insulation distance is long due to the protruding portions 31a extending in the horizontal direction from both ends of the insulating plate 31, so that desired insulation can be maintained.

Subsequently, the armature block 51 is assembled from above the coil block 41. In this case, the locking tongue piece 54 of the hinge spring 53 is inserted into the snap-fit portion A formed between the guide wall 47a and the suction portion 49b of the iron core 49. As a result, the locking tongue piece 54 is inserted into the snap-fit portion A while being elastically deformed, then returns to its shape, and is locked to the lower edge of the suction portion 49b (FIG. 17).
reference). Therefore, the hinge spring 53 does not come into contact with the resin molded product such as the base 21 and does not damage the resin molded product due to the turning operation of the movable iron piece 52. In this case, since the hinge spring 53 is guided by the guide wall 47a, the locked state is not released.

Thereafter, the card 55 is assembled from obliquely above. The card 55 is assembled by inserting the locking projection 57 into the positioning notch 23c of the movable contact piece 23 and then locking the elastic locking part 56 to the notch 52a of the movable iron piece 52. However, the card 55 may be assembled to the movable iron piece 52 before the armature block 51 is assembled.

Thus, each of the blocks 20, 30, 4
0, the window 47b of the spool 42
By deforming one end of the movable contact piece 23 together with the welded portion 24a of the common terminal 24 via (see FIG. 16), the distance between the movable contact 23a and the fixed contacts 22a and 32a is adjusted. In this manner, by forming the window portion 47b, since the adjustment can be performed from the side after the assembly, the distance between the contacts can be adjusted easily and accurately.

Finally, cover the base 21 with the case 60,
The electromagnetic relay is completed by filling the recess 21b on the lower surface shown in FIG. 18 with a sealant.

Next, the operation of the electromagnetic relay will be described.

When the coil block 41 to which the coil 50 is not energized is not excited, as shown in FIG. 17A, the movable iron piece 52 is moved by the elastic force of the hinge spring 53 and the movable contact pieces 23 located on both sides. Energized, iron core 49
Is separated from the suction part 49a. Thereby, each movable contact piece rotates upward via the card 55.
Each movable contact 23a on the lower surface is separated from each first fixed contact 22a exposed on the upper surface of the base 21. Further, the movable contact 23a on the upper surface side of the movable contact piece 23 located on both sides is closed to the second fixed contact 32a.

Here, when the coil 50 is energized by energizing the coil 50, the suction force of the iron core 49 at the suction part 49 a exceeds the elastic force, and one end of the movable iron piece 52 is connected to the suction part 49 a of the iron core 49. It is sucked. As a result, each movable contact piece 23 rotates downward via the card 55, and each movable contact 23a on the lower surface side is connected to each first fixed contact 2 of the base 21.
Close to 2a. When the coil block 41 is demagnetized by cutting off the current supply to the coil 50, the movable contact piece 23 returns to its original position by its own elastic force. Therefore, the movable contact 23b is separated from the first fixed contact 22a,
The movable contact 23a closes to the second fixed contact 32a.

[0043]

As is apparent from the above description, according to the electromagnetic relay of the present invention, not only the insulating plate and the base block cover the contact opening / closing mechanism in the vertical and width directions, but also extend from both ends of the insulating plate. Since the length of insulation in the longitudinal direction (creeping distance) can be increased by the provided protrusions, sufficient insulation between the contact opening / closing mechanism and the coil block can be obtained even in a small size.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electromagnetic relay according to an embodiment viewed from above.

FIG. 2 is an exploded perspective view of the electromagnetic relay according to the embodiment as viewed from below.

FIG. 3 is a perspective view of a lead frame.

FIG. 4 is a perspective view showing a state in which a case is formed on the lead frame of FIG. 3 by injection molding.

FIG. 5 is an exploded perspective view of a base block.

FIG. 6 is a perspective view of a base block.

FIG. 7 is an exploded perspective view of an insulating block.

FIG. 8 is an exploded perspective view of a base block and an insulating block.

FIG. 9 is a perspective view showing a state where an insulating block is assembled to a base block.

FIG. 10 is an exploded perspective view of a coil block.

FIG. 11 is an exploded perspective view of the armature block.

FIG. 12 is a perspective view showing a state where the coil block is assembled in FIG. 9;

FIG. 13 is a perspective view showing a state where the armature block is assembled in FIG.

FIG. 14 is a perspective view showing a state where the card is assembled in FIG.

FIG. 15 is a perspective view showing a state in which a case is put on FIG. 14;

FIG. 16 is a perspective view showing a state where FIG. 15 is viewed from different angles.

17 is a sectional view taken along line II of FIG. 16 (a) and a partially enlarged view thereof (b).

FIG. 18 is a perspective view showing a state where FIG. 15 is viewed from the bottom surface side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Base block 22 1st fixed terminal 22a 1st fixed contact 23 Movable contact piece 23a Movable contact 31 Insulating plate 31a Projection 40 Electromagnetic block 51 Armature block

Claims (1)

[Claims] 1. A flat plate provided with a contact opening / closing mechanism having a fixed contact formed by insert molding a fixed terminal so that a fixed contact is exposed on an upper surface thereof and having a movable contact piece having a movable contact which comes into contact with and separates from the fixed contact. A base block and a coil block formed by winding a coil around an iron core provided on a spool, and an armature block in which a hinge spring is integrated with a movable iron piece are mounted above the coil block, and are disposed above the base block. An electromagnet block that drives the movable contact piece through a card by rotating a movable iron piece based on excitation and demagnetization of the coil block; and a contact opening / closing mechanism of the base block and an electromagnet block. An insulating plate that covers the top and bottom and the width direction of the contact opening / closing mechanism with the side edge of the base block, and increases the longitudinal insulation distance at the protrusions at both ends. Electromagnetic relay characterized by comprising.