JPH06267393A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To maintain and enhance the operating characteristics of an electromagnetic relay by ensuring that a moving block is smoothly rotated. CONSTITUTION:A bearing recessed portion 16a is provided on the upper surface of each column portion 16 which is projected from a base 10 in such a manner as to locate on each side of an electromagnet block 20. A roughly U-shaped support 80 is provided on the inner surface of the bearing recessed portion 16a. Shaft portions 44 projected from the opposite outside faces of a moving block 70 are fitted into the bearing recessed portion 16a via the linear support 80 and are 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 support structure for a movable block which rotates based on excitation and demagnetization of an electromagnet block.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic relay having a movable block that rotates based on excitation and demagnetization of an electromagnet block, there is, for example, one described in Japanese Patent Application No. 4-70797. That is, the electromagnet block 20 provided on the base 10
A pair of support pillars 16, 16 are provided on the upper surface of the base 10 so as to face each other with the movable block 8 in a recess 16a which is a bearing provided on the upper end surface of the support pillar 16.
Shafts 44 projecting on the same axis from the outer side surfaces of 0 facing each other
Is rotatably supported by fitting from above.

[0003]

However, in the above-mentioned electromagnetic relay, the rotating shafts 44, 44 of the movable block 80 are provided.
Is in surface contact with the recess 16a, which is a bearing provided on the pillars 16, 16 of the base 10, so that the frictional force is large,
It is difficult to obtain a smooth turning motion. In particular, as the attracting force of the electromagnet block 20 becomes smaller as the size of the device becomes smaller, the frictional force becomes relatively larger and the operating characteristics deteriorate. Therefore, it is possible to increase the attraction force of the electromagnet block 20, but there is a problem that power consumption increases.

In view of the above problems, it is an object of the present invention to provide a low power consumption type electromagnetic relay capable of ensuring a smooth pivoting operation of a movable block and maintaining and improving its operating characteristics.

[0005]

In order to achieve the above-mentioned object, an electromagnetic relay according to the present invention has a movable block rotatably mounted on the upper surface of an electromagnet block provided on a base for exciting the electromagnet block. In an electromagnetic relay that opens and closes contacts with the movable block that rotates based on degaussing, a substantially U-shape that is located on both sides of the electromagnet block and that is made of a linear material on the inner surface of a bearing recess provided on the upper surface of the base. And a shaft portion projecting from the opposing outer surface of the movable block is fitted into the bearing concave portion via the linear receiving member so as to be rotatably supported. . Further, the receiving member may be formed of a linear spring material, and at least one end portion thereof may be provided with an elastic arm portion that comes into pressure contact with a protruding portion protruding from an outer surface of the movable block.
Further, the distance from the shaft portion projecting on the movable block to the plurality of projections projecting on the movable block may be different. The receiving member is provided with an elastic arm portion having a substantially J-shape in plan view at least at one end, and the tip end portion of which is brought into pressure contact with a protruding portion protruding from the outer surface of the movable block. May be. Alternatively, the receiving member has at least one end an elastic arm portion having a substantially J-shaped front surface and alternately press-contacting an intermediate portion and a folded portion protrudingly provided on an outer surface of the movable block. It may be provided.

[0006]

Therefore, according to the first aspect of the present invention, the shaft portion of the movable block is supported by the linear receiving member of the bearing recess in a line contact state. Further, according to claim 2, the elastic arm portion of the linear receiver acts as a load spring,
Action force and restoring force are applied to the movable block.
Further, according to claim 3, the distance between the fulcrums of the elastic arms is different. Particularly, according to the fourth aspect, the substantial distance between the fulcrums of the elastic arms becomes long. Further, according to claim 5, one elastic arm portion has a substantially different distance between fulcrums.
A receiver with two elastic arms is obtained.

[0007]

Embodiments of the present invention will now be described with reference to the accompanying drawings of FIGS. As shown in FIGS. 1 to 3, 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 70, an insulating frame 40, a load spring 50, and Movable contact piece block 60, receiver 80, case 9
It consists of zero.

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, this bearing recess 16
The inner surface of a is provided with a notch groove 16b (FIG. 3) into which a receiving member 80 described later is press-fitted.

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.

The common contact terminal 13 is divided into two upper ends,
One is a column 14b via a lead frame (not shown).
Is electrically connected to the fixed contact 13a provided on the upper end surface of the column, and the other is electrically connected to the fixed contact 13b provided on the upper end surface of the column portion 15b via a lead frame (not shown).

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

The electromagnet block 20 is formed by inserting a permanent magnet 22 into an iron core 21 having a substantially U-shaped cross section to form a substantially E-shaped cross section, and insert-molding this into a spool 23. Center collar part 2 of spool 23
While exposed from the upper surface of 3a, the left magnetic pole portion 2 of the iron core 21
1a is exposed from the upper surface of the collar portion 23b of the spool 23, and the right magnetic pole portion 21b of the iron core 21 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 entangled in the entangled portions 25a of the coil terminals 25 (the entangled portion on the front side is not shown) in FIG. It is attached. In the present embodiment, since the barbed portion 25a projects inside 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 is wider than the right magnetic pole portion 21b and has a large attracting area, so that the left and right magnetic balances are broken. .

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 the movable block 70 by an insulating frame 40, a load spring 50, and a movable contact piece block 60, which will be described later. Projection 3 which is the fulcrum
1 (FIG. 3), and the lower surfaces of both end portions 32a and 32b are tapered surfaces. Further, the movable iron piece 30 has two caulking holes 3 provided so as to face each other with the protrusion 31 interposed therebetween.
Have three.

The insulating frame 40 has a box shape capable of covering the movable iron piece 30, and has the base 10 at both ends.
Loose fitting holes 4 that can be loosely fitted to the pillars 14b and 15b
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 partition piece 40a arranged in a comb-like shape to form the loose fitting holes 41 and 42 of the insulating frame 40.
(Fig. 2), fixed contacts 11a, 13a and 12a, 13
Since each b is partitioned, the insulation characteristics are 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, since the protrusion 40c provided on the upper end surface of the partition piece 40a located in the center partitions the fixed contacts 13a, 13a and 13b, 13b, respectively, 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 protruding portions 43, 43 are thermally caulked, whereby the insulating frame body 40 in which the movable iron piece 30 is integrated, and the load spring 50.
And the movable contact piece block 60 are integrated with each other to form the movable block 70.

The receiving member 80 is made of a linear material having a substantially U-shaped front surface, and is fixed by being press-fitted into a notch groove 16b provided in the bearing recess 16a of the supporting column 16.

The movable block 70 is attached to the base 1
When the shaft portion 44 of the insulating frame body 40 is positioned above 0 and is fitted into the receiving member 80 that is press-fitted into the bearing recessed portion 16a of the column portion 16, the protrusion 31 of the movable iron piece 30 is attached to the magnetic pole portion 22a of the permanent magnet 22. The movable iron piece 30 abuts and is rotatably supported, and the movable contacts 62a, 62b and 63a, 6
3b opposes the fixed contacts 11a, 13a and 12a, 13b so that they can come into contact with and separate from each other.

In the assembled state (FIG. 3),
The magnetic pole surface 22a of the permanent magnet 22 and the protrusion 31 of the movable iron piece 30
Since the elastic arms 51 and 52 of the load 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 this 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.

The case 90 has a substantially box shape that can be fitted to the base 10 and has position regulating projections 91, 91 at its inner corners.
Is protruding.

Then, when the case 90 is fitted to the base 10, the projections 91 and 91 are loosely fitted to the notch recesses 65 and 65 of the movable contact piece block 60, respectively, and the movable block 70 is lifted upward. regulate. Then,
After the sealant 92 is injected into the recess formed by fitting the case 90 to the base 10 and solidified, the internal gas is released from a gas vent hole (not shown) of the base 10 and the gas vent hole is melted by heat. The assembly work is completed by sealing.

Next, the operation of the electromagnetic relay having the above construction will be described. In the case of no excitation, the left end 32a of the movable iron piece 30 is attracted to the wide left magnetic pole 21a of the iron core 21 by the magnetic flux of the permanent magnet 22 to close the magnetic circuit (FIG. 3). Therefore, the movable contact 6 of the movable contact piece 62
2a and 62b are in contact with the fixed contacts 11a and 13a, while the movable contacts 63a and 63b are in contact with the fixed contacts 12a and 13a.
and the elastic arm portion 51 is separated from the protrusion b of the base 10.
Is pressed against.

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 uses the protrusion 31 as a fulcrum to move the movable block 70.
The shaft portion 44 of the movable iron piece 30 rotates while making line contact with the receiving member 80 of the bearing recess 16a, and the left end portion 32a of the movable iron piece 30 moves to the iron core 2.
After separating from the left magnetic pole portion 21a of No. 1, 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, 62 of the movable contact piece 62 are
After b is separated from the fixed contacts 11a and 13a, the movable contacts 63a and 63b of the movable contact piece 63 are fixed to the fixed contacts 12a and 1a.
The elastic arm portion 52 is brought into pressure contact with the protrusion portion 19b of the base 10 while being in contact with 3b.

When the excitation of the coil 26 is released,
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 left magnetic pole portion 21 of the iron core 21.
Due to the imbalance of the magnetic force between the a and the right magnetic pole portion 21b, the movable iron piece 30 returns to its 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 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 addition, in this embodiment, the receiving member 80 does not necessarily need to have a spring property.

In the second embodiment, as shown in FIGS. 4 to 6, the elastic arms 51, 51 of the load spring 50 of the first embodiment described above are used.
While the operating force and the restoring force are obtained by 52, the operating force and the like are obtained by the receiving member 80 made of a metal linear spring material. That is, the receiver 80 has elastic arms 81 and 82 extending from both ends in a substantially horizontal direction. The elastic arms 81 and 82 are movable blocks 70.
The projections 45, 46 projecting from the opposing outer surfaces of the two are pressed against each other. The other points are the same as those in the above-described first embodiment, and the description thereof will be omitted. The distances between the fulcrums from the shaft portion 44 to the protrusions 45 and 46 do not necessarily have to be the same, and may be different as necessary to obtain a desired load curve.

According to this embodiment, since the receiving member 80 is also used as the load spring, the number of parts and the number of assembling steps are reduced.

The third embodiment is a case where, as shown in FIGS. 7 and 8, the receiving member 80 is constituted by the elastic arms 81 and 82 whose both ends extend straight as in the second embodiment. On the other hand, one end is a substantially J-shaped elastic arm portion 83 in the plane and the other end is a straight elastic arm portion 84.

According to this embodiment, since the tip end of the elastic arm portion 83 is pressed against the protrusion 45 of the movable block 70, the distance between the fulcrums of the elastic arm portion 83 is substantially smaller than that of the elastic arm portion 84. long. Therefore, there is an advantage that a desired load curve can be easily obtained, and matching with the suction force curve can be further facilitated.

In the fourth embodiment, as shown in FIGS. 9 to 11, the receiving member 80 of the above-mentioned second and third embodiments has two elastic arm portions, but one receiving member is provided. Elastic arm 8
5 is a case where the operation force and the restoring force are obtained. That is, the receiving member 80 has a substantially J-shaped front elastic arm 8 extending to one side.
5, the elastic arm portion 85 is provided as shown in FIG.
The intermediate portion and the tip of the folded-back portion 86 alternately come into pressure contact with the protrusion 46 provided on the movable block 70.

According to the present embodiment, since the distance between the fulcrums of the elastic arms 85 can be increased by the folded-back portions 86 of the elastic arms 85, there is an advantage that the load curve can be easily matched with the attraction force curve of the electromagnet block 20. .

In the above embodiment, the case where the shaft portion 44 is integrally formed with the insulating frame 40 has been described, but the present invention is not limited to this, and insert molding may be performed using a metal round bar as the shaft portion. Therefore, there is an advantage that the frictional force is further reduced and the rotating operation becomes smoother.

[0045]

As is apparent from the above description, according to the electromagnetic relay of the first aspect of the present invention, the shaft portion of the movable block is supported in line contact with the linear receiver provided in the bearing recess. Therefore, the frictional force is reduced, a smooth turning operation is obtained, and the operation characteristics are improved. In particular, even if the device is downsized and the attraction force becomes smaller, the frictional force does not become relatively large, so there is no need to increase the attraction force, and a low power consumption type electromagnetic relay can be obtained. Moreover, according to the second aspect, since the receiver functions as a load spring and it is not necessary to provide a separate load spring, the number of parts and the production man-hour do not increase, and the production management becomes easy. In particular, when compared with the conventional example, the load spring does not need to be provided between the insulating frame and the movable contact piece block, so the bending moment acting on the load spring as the movable block rotates causes the insulating frame to move. And the gap between the movable contact piece and the movable contact piece does not increase. As a result, the movable contact block does not rattle and the operating characteristics do not deteriorate. Further, according to the third aspect, since the desired load curve can be obtained by making the positions of the protrusions different, it is easy to match with the suction force curve, and the degree of freedom in design is increased. According to claim 4, the protrusion has a substantially flat surface J.
It comes into pressure contact with the V-shaped elastic arm and the substantial distance between the fulcrums of the elastic arm becomes longer, making it easier to obtain the desired load curve.
Matching becomes easier with the suction force curve. Further, according to the fifth aspect, since the operating force and the restoring force having different magnitudes can be obtained from one elastic arm portion, the receiver, particularly the metal receiver can be further downsized. Therefore, there is an effect that the insulating distance becomes long and the insulating characteristic is 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 exploded perspective view showing a second embodiment of the electromagnetic relay according to the present invention.

FIG. 5 is a plan sectional view showing a second embodiment of the electromagnetic relay according to the present invention.

FIG. 6 is a front sectional view showing a second embodiment of the electromagnetic relay according to the present invention.

FIG. 7 is an exploded perspective view showing a third embodiment of the electromagnetic relay according to the present invention.

FIG. 8 is a plan sectional view showing a third embodiment of the electromagnetic relay according to the present invention.

FIG. 9 is an exploded perspective view showing a fourth embodiment of the electromagnetic relay according to the present invention.

FIG. 10 is a plan sectional view showing a fourth embodiment of the electromagnetic relay according to the present invention.

FIG. 11 is a front sectional view showing a fourth embodiment of the electromagnetic relay according to the present invention.

[Explanation of symbols]

10 ... Base, 16 ... Strut part, 16a ... Bearing recess, 2
0 ... Electromagnetic block, 44 ... Shaft, 50 ... Load spring, 5
1, 52 ... Elastic arm portions, 70 ... Movable block, 80 ... Receiving device.

Claims (5)

[Claims] 1. An electromagnetic relay in which a movable block is rotatably mounted on an upper surface of an electromagnet block provided on a base, and contacts are opened and closed by the movable block that rotates based on excitation and demagnetization of the electromagnet block. Substantially U, which is located on both sides of the electromagnet block and is made of a linear material, on the inner surface of a bearing recess provided on the upper surface of the base.
A character-shaped receiver is provided, and a shaft portion projecting from an outer surface facing the movable block is fitted into the bearing recess via the linear receiver to rotatably support the electromagnetic member. relay. 2. The receiving member is made of a linear spring material, and at least one end portion thereof is provided with an elastic arm portion which comes into pressure contact with a protruding portion protruding from an opposing outer surface of the movable block. The electromagnetic relay according to claim 1. 3. The electromagnetic relay according to claim 2, wherein distances from a shaft portion protruding from the movable block to a plurality of protrusions protruding from the movable block are made different. 4. An elastic arm portion having at least one end portion of the receiving member, which has a substantially J-shape in a plan view, and which has a tip portion in pressure contact with a protrusion portion protruding from an outer surface of the movable block. The electromagnetic relay according to claim 2 or 3, characterized in that. 5. An elastic arm in which the receiving member has a substantially J-shaped front surface at least at one end, and alternately presses the intermediate portion and the folded portion to a protruding portion provided on the outer surface of the movable block. 5. A portion is provided, and the portion is provided.
The electromagnetic relay according to any one of 1.