JPH06267392A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To provide an electromagnetic relay the component parts of which are easy to manufacture and the operating characteristics of which are uniform. CONSTITUTION:A positioning recessed portion 21c of roughly triangular cross section is formed by curving the center portion of an iron core 21 of roughly U-shaped cross section. A portion of the center portion 23a of a spool 23 with which the iron core 21 is insert molded is recessed 23c. A permanent magnet 22 of rectangular cross section is fitted into the recessed portion 21c of the iron core 21 which is located on the bottom face of the recessed portion 23c. An engagement groove 31 provided on the lower surface of a moving iron core 30 is engaged with the corner portion 22a of the permanent magnet 22 so that the moving iron piece 30 is rotatably supported.

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 mounting structure for a permanent magnet that constitutes a magnetic circuit.

[0002]

2. Description of the Related Art Conventionally, as a magnetic circuit of an electromagnetic relay,
For example, as shown in FIG. 7, the support protrusion 4 of the movable iron piece 3 is placed on the center portion of the upper surface of the permanent magnet 2 arranged in the center portion of the substantially U-shaped iron core 1 so as to be rotatably supported. By applying a voltage to the coil 5 wound around the iron core 1 to excite it, the movable iron piece 3 is rotated, and both ends 3a and 3b of the movable iron piece 3 are rotated.
There is one in which both ends 1a and 1b are alternately contacted and separated. In addition, since the above-mentioned electromagnetic relay is of a self-reset type, one end portion 1a of the iron core 1 is bent in the horizontal direction to make the attracting areas different and to disrupt the magnetic balance.

[0003]

However, in the above-described electromagnetic relay, one end portion 1a of the iron core 1 has to be bent accurately in the horizontal direction, which is troublesome to manufacture. In particular, there is a problem that the above-described bending process becomes extremely difficult as the size of the device becomes smaller, and the precision of parts tends to vary, which adversely affects the operating characteristics.

In view of the above problems, it is an object of the present invention to provide an electromagnetic relay whose component parts are easy to manufacture and whose operating characteristics are uniform.

[0005]

In order to achieve the above object, an electromagnetic relay according to the present invention is an electromagnetic relay in which a movable iron piece is rotatably supported by a permanent magnet having a rectangular cross section attached to an iron core. A movable iron piece is rotatably supported at a corner portion of a permanent magnet that is inclined with respect to the core. Further, the movable iron piece may be one in which an engaging groove provided on one surface thereof is engaged with a corner portion of the permanent magnet and is rotatably supported. Further, the iron core may be assembled by fitting the corner portion of the permanent magnet into a positioning recess having a substantially triangular cross section provided on one surface thereof. The movable iron piece may be rotatably supported via a thin material covering the corners of the permanent magnet.

[0006]

Therefore, according to the first aspect of the present invention, the movable iron piece rotates about the corner of the permanent magnet having a rectangular cross section as a fulcrum. Further, according to the second aspect, the movable iron piece is rotatably supported through the engaging groove that engages with the corner portion of the permanent magnet. Further, according to claim 3,
The permanent magnet is assembled in the iron core with a predetermined inclination in the positioning recess having a substantially triangular cross section. According to the fourth aspect, the movable iron piece is rotatably supported by the corner portion of the permanent magnet through the thin material.

[0007]

Embodiments of the present invention will now be described with reference to the accompanying drawings of FIGS. As shown in FIGS. 1 to 4, the electromagnetic relay according to the first embodiment generally includes a base 10, an electromagnet block 20, a movable iron piece 30 constituting a movable block 80, an insulating frame 40, a load spring 50, and It comprises a movable contact piece block 60 and a case 70.

The base 10 has a substantially rectangular shape in plan view, and the fixed contact terminals 11 and the common contact terminals 13 are symmetrically insert-molded in pairs, and a pair of fixed contact terminals 12 are press-fitted so as to face each other. (The contact terminals on the back side are not shown in FIG. 1), and the support columns 14a, 14b, 14b, 14a and 15a, 15b, near the edge on the short side.
15b and 15a are provided so as to face each other, and positioning support columns 16 and 16 are provided at intermediate positions between the support columns 14a and 15a, respectively.

Further, spring receiving projections 19a and 19b are respectively provided between the pillar portion 16 and the pillar portions 14a and 15a located on the front side in FIG.
Bearing support recesses 16a are formed on the upper end surfaces of the pillars 16, 16.
16a is provided.

Further, the upper end of the fixed contact terminal 11 is electrically connected to the fixed contact 11a provided on the upper end surface of the support 14a through a lead frame (not shown), and the upper end of the fixed contact terminal 12 is supported by the support 15a. Is electrically connected to a fixed contact 12a provided on the upper end surface of the.

Further, the common contact terminal 13 has an upper end portion divided into two, one of which is electrically connected to a fixed contact 13a provided on the upper end surface of the column portion 14b through a lead frame (not shown), and the other is not shown. Support part 1 through the frame
It is electrically connected to a fixed contact 13b provided on the upper end surface of 5b.

Insulating walls 17 are provided between the pillars 14a and 15a. In addition,
18a is a coil terminal hole.

In the electromagnet block 20, as shown in FIG. 4, a central concave portion of an iron core 21 having a substantially U-shaped cross section is bent to form a positioning concave portion 21c having a substantially triangular cross section, which is insert-molded on a spool 23. The recess 21c of the iron core 21 located on the bottom surface of the recess 23d provided in the central collar portion 23a.
The permanent magnet 22 having a rectangular cross section is fitted and assembled to the spool 23.
While protruding from the upper surface of the central collar portion 23a of the iron core 21, the left magnetic pole portion 21a of the iron core 21 is exposed from the upper surface of the collar portion 23b of the spool 23, and the right magnetic pole portion 2 of the iron core 21 is exposed.
1b is exposed from the upper surface of the collar portion 23c of the spool 23.

Frame portions 24a and 24b are integrally formed on the outer surfaces of the collar portions 23b and 23c, respectively, and coil terminals 25 and 25 are insert-molded to the frame portion 24a. Then, the lead wires of the coil 26 wound around the spool 23 are respectively twisted to the twisted portion 25a of the coil terminal 25 in FIG. 4 (the twisted portion on the front side is not shown), and soldered. It is attached. In this embodiment, since the barbed portion 25a projects from the inside of the frame portion 24a, there is an advantage that it does not become an obstacle when the electromagnet block 20 is assembled.

Although the thickness of the iron core 21 is constant, the left magnetic pole portion 21a and the right magnetic pole portion 21b are wide, and the adsorption area is wide.

When the electromagnet block 20 is positioned above the base 10 and the coil terminal 25 is press-fitted into the coil terminal hole 18a and temporarily fixed, the frame portions 24a and 2a are formed.
Struts 14b, 14b and 15b, 15b respectively project from 4b.

The movable iron piece 30 has an outer shape of a substantially rectangular plane, and constitutes a movable block 80 by an insulating frame 40, a load spring 50, and a movable contact piece block 60, which will be described later. An engagement groove 31 serving as a dynamic fulcrum is provided (FIG. 4), and the lower surfaces of both end portions 32a and 32b are tapered surfaces. Further, the movable iron piece 30 has two caulking holes 33 provided so as to face each other with the engagement groove 31 in between.

The insulating frame 40 has a box shape capable of covering the movable iron piece 30, and has loose fitting holes 4 at both ends which can be loosely fitted in the support columns 14b and 15b of the base 10, respectively.
1, 42 are formed, and a caulking projection (not shown) is formed on the lower surface thereof at a position corresponding to the caulking hole 33 of the movable iron piece 30.
And a pair of caulking projections 4 on its upper surface.
3,43 are projected. Further, the insulating frame body 40 is provided with shaft portions 44, 44 in the central portion of the opposing outer side surfaces. Then, the caulking protrusions (not shown) of the insulating frame 40 are inserted into the caulking holes 33, 33 of the movable iron piece 30, respectively, and heat caulking is performed, whereby the both are integrated.

According to the present embodiment, the partitioning piece 40 arranged in a comb-like shape to form the loose fitting hole 41 (42) of the insulating frame 40.
a (FIG. 2), fixed contacts 11a, 13a and 12a, 1
Since 3b is divided respectively, the insulating property is high.

Moreover, since the tip of the partition piece 40a is connected and integrated by the connecting portion 40b, it is difficult to deform. However, the continuous portion 40b is not always necessary as long as it is only for obtaining desired insulation characteristics.

Further, the insulating frame body 40 is used as the electromagnet block 2.
0 and the movable iron piece 30 are replaced by movable contact pieces 62, 6 described later.
3 and the fixed contacts 13a and 13b, the insulation distance is long and the insulation characteristics are good.

Particularly, the ridge 40c (FIG. 3) provided on the upper end surface of the partition piece 40a located at the center is fixed contacts 13a, 1
Since 3a, 13b and 13b are respectively partitioned, the insulation characteristics after operation and after restoration are good.

The load spring 50 is formed by punching and bending a plate-shaped spring material, and has a pair of elastic arm portions 5 extending in opposite directions.
1, 52 are spring receiving projections 19 a, 1 of the base 10.
9b, respectively, while the insulating frame 40
The caulking hole 5 is provided at a position corresponding to the caulking protrusions 43, 43 of
It has 3,53. The elastic arm portion 52 is wider than the elastic arm portion 51.

The movable contact piece block 60 is formed by insert-molding two movable contact pieces 62 and 63 each having a substantially U-shaped plane in the front and rear of the insulating base 61 into a total of four pieces (FIG. 2). The insulating frame 4 is provided at the center of the insulating base 61.
The crimping holes 64 are provided at positions corresponding to the crimping protrusions 43 of 0,
64 is provided.

Both ends of the movable contact piece 62 are divided into two in the width direction, and a movable contact 62a is provided on the lower surface of one end and a movable contact 62b is provided on the lower surface of the other end. Further, the movable contact piece 63 is also provided with movable contacts 63a and 63b on the lower surface of the end portion thereof similarly to the movable contact piece 62.

Then, the protrusions 43, 4 of the insulating frame 40
3, the caulking holes 53, 53 of the load spring 50 and the insulating base 6
The caulking holes 64, 64 of No. 1 are sequentially inserted, and the protruding end portions of the projecting portions 43, 43 are thermally caulked, whereby the insulating frame 40 in which the movable iron piece 30 is integrated, the load spring 50, and the movable contact piece block. 60 together form a movable block 80.

Next, when this is positioned above the base 10 and the shaft portion 44 of the insulating frame body 40 is fitted into the recess portion 16a provided in the column portion 16 of the base 10, the corner portion 22a of the permanent magnet 22 is fitted. The engaging groove 31 of the movable iron piece 30 is engaged, the movable iron piece 30 is rotatably supported, and the movable contact 6
2a, 62b and 63a, 63b are fixed contacts 11a,
It opposes 13a and 12a, 13b so that it can contact and separate, respectively.

In the assembled state (FIG. 3),
The corner portion 22a of the permanent magnet 22 and the engaging groove 31 of the movable iron piece 30
Since the elastic arms 51 and 52 of the hinge spring 50 are located on substantially the same plane, an extra bending moment is not applied and a smooth operation can be obtained.

Further, according to the present embodiment, the movable contacts 62a, 62 are provided more than the ends 32a, 32b of the movable iron piece 30.
Since b and 63a, 63b are in the positions projecting further forward, the radius of gyration of the movable contact pieces 62, 63 is long. Therefore, even if the rotation angle of the movable iron piece 30 is small, the contacts can be sufficiently opened and closed. As a result, there is an advantage that an electromagnetic relay having high sensitivity and low power consumption and a large contact gap can be obtained. In the present embodiment, the permanent magnet 22
The upper surface of the short side is closer to the movable iron piece 30 than the upper surface of the long side, and the left and right magnetic balance with respect to the movable iron piece 30 is lost.

The case 70 has a substantially box shape that can be fitted into the base 10 and has position control projections 71, 71 at its inner corners.
Is protruding.

When the case 70 is fitted to the base 10, the protrusions 71, 71 are loosely fitted in the cutout recesses 65, 65 of the movable contact piece block 60, respectively, and the movable block 80 is lifted upward. regulate. Then,
After the sealant 81 is injected and solidified in the recess formed by fitting the case 70 to the base 10, the internal gas is released from a gas release hole (not shown) of the base 10, and the gas release hole is heat-melted. The assembly work is completed by sealing.

Next, the operation of the electromagnetic relay having the above configuration will be described. In the case of non-excitation, the magnetic balance with respect to the movable iron piece 30 is lost as described above,
Due to the magnetic flux of the permanent magnet 22, the left end 3 of the movable iron piece 30
2a is attracted to the wide left magnetic pole portion 21a of the iron core 21 to close the magnetic circuit (FIG. 3). Therefore, the movable contacts 62a and 62b of the movable contact piece 62 are fixed to the fixed contacts 11a and 13a.
While being in contact with a, the movable contacts 63a and 63b are separated from the fixed contacts 12a and 13b, and the elastic arm portion 51 is in pressure contact with the protrusion 19a of the base 10.

Next, when a voltage is applied to the coil 26 to excite it so that a magnetic flux that cancels the magnetic flux of the permanent magnet 22 is generated,
Since the right end 32b of the movable iron piece 30 is attracted to the right magnetic pole 21b of the iron core 21, it resists the magnetic force of the permanent magnet 22,
The movable iron piece 30 rotates about the corner 22a as a fulcrum, and the left end portion 32a of the movable iron piece 30 moves to the left magnetic pole portion 21a of the iron core 21.
After separating from, the right end portion 32b of the movable iron piece 30 is attracted to the right magnetic pole portion 21b of the iron core 21. Therefore, the movable contacts 62a, 62b of the movable contact piece 62 are fixed to the fixed contacts 11a,
After separating from 13a, the movable contact 63 of the movable contact piece 63
The a and 63b come into contact with the fixed contacts 12a and 13b, and the elastic arm portion 52 comes into pressure contact with the protruding portion 19b of the base 10.

Then, when the excitation of the coil 26 is released,
Since the restoring force based on the spring force of the movable contact pieces 63, 63 and the spring force of the elastic arm portion 52 and the short side upper surface of the permanent magnet 22 are closer to the movable iron piece 30 than the long side upper surface, the movable iron piece 30 is After returning to the original position, the movable contacts 62a, 62b and 63a, 63b are switched, and the original state is restored.

According to this embodiment, the movable contact pieces 62, 63 are
Has a substantially U-shaped plane and is a so-called double break type, so that the distance between the fixed contact 11a and the movable contact 62a can be half as compared with the so-called single break type. Therefore, the height of the electromagnetic relay can be saved and the device can be downsized.

Further, since the load spring 50 is composed of the elastic arm portions 51 and 52 which act separately at the time of operation and at the time of returning, it is easy to obtain a desired load curve by appropriately selecting the both. Therefore, the electromagnet block 20
It is easy to match the load curve of the load spring 50 with the substantially S-shaped suction force curve based on the above, and there is an advantage that the degree of freedom in design is large.

In the second embodiment, as shown in FIGS. 5 and 6, in the first embodiment, the corner portion 22a of the permanent magnet 22 is directly engaged with the engaging groove 31 of the movable iron piece 30 to rotate. In contrast to the case where it is supported so as to be possible, the corner portion 22a of the permanent magnet 22 is covered with the thin material 27, and the movable iron piece 30 is rotatably supported through the thin material 27.

The thin material 27 of this embodiment is for protecting the corner portions 22a of the fragile permanent magnet 22 and for ensuring a smooth turning operation. As the thin material, for example, a non-magnetic material is used. Examples of the stainless steel plate and polyester film include

In this embodiment, since the central collar portion 23a of the spool 23 is higher than the other collar portions 23b and 23c to form the step, the rotation angle of the movable iron piece 30 is larger than that of the first embodiment. Also has the advantage that a large stroke can be obtained. Since the other points are almost the same as those in the first embodiment, the description thereof will be omitted.

In the above embodiment, the case where the shaft portion 44 is integrally molded with the insulating frame 40 has been described, but the invention is not limited to this, and the metal round bar may be insert molded as the shaft portion. . Further, the load spring 50 does not have to be fixed to the same side surface as the shaft portion 44 at one end thereof, but may be fixed to a different side surface, while the other end portion of the load spring 50 is
It goes without saying that not only the base 10 but also other fixed parts, for example, the electromagnet block 20 may be brought into contact.

[0041]

As is apparent from the above description, according to the first aspect of the present invention, since the permanent magnets are mounted on the iron core while being inclined, both upper surfaces of the permanent magnets that form the corners are movable. The attraction force to the iron piece becomes imbalanced and the magnetic balance is lost. Therefore, it is not necessary to bend one end of the iron core in the horizontal direction, and the manufacturing of the component is facilitated. In particular, even if the device is downsized, it is not necessary to bend one end of the iron core, so that there is no variation in operating characteristics due to variation in component accuracy as in the conventional example. Further, according to the second aspect, the engaging groove provided in the movable iron piece engages with the corner portion of the permanent magnet, the movable iron piece does not easily shift, and the movable iron piece does not rattle, so that the operation characteristics are stabilized. Further, according to the third aspect, since the corner portions of the permanent magnet are fitted and positioned in the concave portions having a substantially triangular cross section, the assembly is facilitated and the assembly accuracy is improved. Moreover, since the contact area between the iron core and the permanent magnet is large, the magnetic resistance is reduced, the leakage of magnetic flux is reduced, and the magnetic efficiency is improved. Further, according to claim 4, since the corners of the fragile permanent magnet are covered with the thin-walled material, the permanent magnet is less likely to be chipped, and not only the life is extended, but also the thin-walled material reduces the friction and the movable member. There is an effect that the rotation of the iron piece becomes smooth and the operating characteristics are further improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of an electromagnetic relay according to the present invention.

FIG. 2 is a plan sectional view showing a first embodiment of an electromagnetic relay according to the present invention.

FIG. 3 is a front sectional view showing a first embodiment of an electromagnetic relay according to the present invention.

FIG. 4 is an essential part exploded cross-sectional view showing a first embodiment of an electromagnetic relay according to the present invention.

FIG. 5 is an exploded perspective view showing a second embodiment of the electromagnetic relay according to the present invention.

FIG. 6 is an essential part exploded cross-sectional view showing a second embodiment of the electromagnetic relay according to the present invention.

FIG. 7 is a schematic cross-sectional view showing a magnetic circuit of an electromagnetic relay according to a conventional example.

[Explanation of symbols]

20 ... Electromagnet block, 21 ... Iron core, 21a, 21b ...
Magnetic pole portion, 21c ... Positioning concave portion, 22 ... Permanent magnet, 2
2a ... Corner, 30 ... movable iron piece, 31 ... engagement groove.

Claims (4)

[Claims] 1. An electromagnetic relay in which a movable iron piece is rotatably supported by a permanent magnet having a rectangular cross section attached to an iron core. An electromagnetic relay characterized by being supported by. 2. The electromagnetic relay according to claim 1, wherein an engaging groove provided on one surface of the movable iron piece is engaged with a corner portion of the permanent magnet to be rotatably supported. 3. The electromagnetic relay according to claim 1, wherein a corner of the permanent magnet is fitted in a positioning recess having a substantially triangular cross section provided on one surface of the iron core. 4. The electromagnetic relay according to claim 1, wherein the movable iron piece is rotatably supported via a thin material covering the corners of the permanent magnet.