JPH06267391A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To provide an electromagnetic relay whose operating characteristics are not deteriorated even if the number of times of operation is increased. CONSTITUTION:A moving block 60 is rotatably placed on the upper surface of an electromagnet block 20 provided on a base 10. Shaft portions 44 projected from the opposite outside faces of the moving block 60 are each fitted with a bearing portion 16a provided in the base 10 and are rotatably supported. A load spring 70, having elastic arm portions 71, 72 which are alternately pressed into contact with respective projecting portions 45, 46 projected from the outside faces of the moving block 60, is provided at the bearing portion 16a of the base 10.

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 load spring thereof.

[0002]

2. Description of the Related Art Conventionally, an electromagnetic relay having a load spring is disclosed, for example, in Japanese Patent Application No. 4-70797. That is, the load spring 50 is sandwiched between the movable contact piece block 60 and the upper surface of the insulating frame body 40 in which the movable iron piece 30 is caulked and fixed to the lower surface, and the projection 43 of the insulating frame body 40 is held.
The movable block 80 formed by crimping is rotated based on the excitation and demagnetization of the electromagnet block 20 provided on the base 10 to open and close the contacts.

[0003]

However, in the above-mentioned electromagnetic relay, the load spring 50 is sandwiched between the insulating frame body 40 and the insulating base 61 of the movable contact piece block 60 and fixed by caulking, so that the electromagnet block is fixed. Each time the movable block 80 rotates due to the excitation and demagnetization of 20, the bending moment acts on the load spring 50, and this acts on the caulking portion. Therefore, there is a problem that the caulking portion is deformed, the gap between the insulating frame body 40 and the insulating base 61 becomes large, the load spring 50 and the movable contact piece block 61 rattle, and the operating characteristics deteriorate.

In view of the above problems, it is an object of the present invention to provide an electromagnetic relay in which the operating characteristics do not deteriorate even if the number of operations and restorations increases.

[0005]

In order to achieve the above-mentioned object, an electromagnetic relay according to the present invention mounts a movable block on an upper surface of an electromagnet block provided on a base so as to be rotatable, and opposes the movable block. In an electromagnetic relay in which a shaft portion projecting on an outer surface of the movable block is rotatably supported by being fitted to a bearing portion provided on the base, an elastic arm portion press-contacting the projection projecting on the outer surface of the movable block. The load spring having the above is provided in the bearing portion of the base. Further, the load spring may have a retaining tongue that is retained by the shaft portion of the movable block to prevent the retaining spring from coming off. Further, the load spring may have a cantilevered elastic arm portion that alternately comes into pressure contact with a plurality of protrusions provided on the outer surface of the movable block. Further, the load spring may have a substantially J-shaped elastic arm portion in a plan view having a folded portion that comes into pressure contact with a protrusion provided on the outer surface of the movable block.

[0006]

Therefore, according to the first aspect of the present invention, the elastic arm portion of the load spring is brought into pressure contact with the protrusion of the movable block, and the moving force and the restoring force are applied to the movable block. Further, according to the second aspect, the tongue piece for preventing the load spring from coming off prevents the shaft portion of the movable block from coming off and prevents rattling. Furthermore, according to claim 3, the cantilevered elastic arms of the load spring are alternately pressed against the plurality of protrusions of the movable block. Further, according to the fourth aspect, the folded-back portion of the elastic arm portion having a substantially J-shape in a plane comes into pressure contact with the protrusion of the movable block.

[0007]

Embodiments of the present invention will be described below 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 that constitutes a movable block 60, an insulating frame 40, and a movable contact piece block. 50, a load spring 70, and a case 80.

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.

Bearing support recesses 16a, 16a are provided on the upper end surfaces of the support columns 16, 16.

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.

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 wider attracting area.

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 has an insulating frame 40 and a movable contact piece block 5 which will be described later.
The movable block 60 is constituted by 0, and the protrusion 31 serving as a rotation fulcrum is formed in the center of the lower surface by the protrusion process (FIG. 3), and the lower surfaces of the both ends 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 protrusion 31 in between.

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 at the central portions of the opposing outer surfaces, and projecting portions 45 and 46 are provided on both sides of the shaft portion 44.

Then, the caulking projections (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 to integrate them.

According to the present embodiment, the partition piece 40a arranged in a comb-like shape to form the loose fitting holes 41, 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 portion 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 40 is used as the electromagnet block 2.
0 and the movable iron piece 30 are replaced by movable contact pieces 52, 5 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 at the center partitions the fixed contacts 13a, 13a and 13b, 13b, respectively, the insulation characteristics after operation and after restoration are good.

The movable contact piece block 50 is formed by insert-molding two movable contact pieces 52 and 53 each having a substantially U-shaped plane in front of and behind the insulating base 51, for a total of four insert moldings (FIG. 2). The insulating frame 4 is provided at the center of the insulating base 51.
The caulking hole 54, at a position corresponding to the caulking protrusion 43 of 0,
54 is provided.

Both ends of the movable contact piece 52 are divided into two in the width direction, and a movable contact 52a is provided on the lower surface of one end and a movable contact 52b is provided on the lower surface of the other end. Further, the movable contact piece 53 is also provided with movable contacts 53a and 53b on the lower surfaces of the end portions thereof, like the movable contact piece 52.

Then, the protrusions 43, 4 of the insulating frame 40
By inserting the caulking holes 54, 54 of the insulating base 51 into 3 and thermally caulking the tips of the projecting protrusions 43, 43, the insulating frame 40 in which the movable iron piece 30 is integrated, and the movable contact piece block The movable block 60 is configured by integrating with 50.

Next, when this is positioned above the base 10 and the shaft portion 44 of the insulating frame 40 is fitted into the recess 16a provided in the column portion 16 of the base 10, the magnetic pole portion 22a of the permanent magnet 22 is fitted. The protrusion 31 of the movable iron piece 30 comes into contact with the movable iron piece 30, so that the movable iron piece 30 is rotatably supported.
2a, 52b and 53a, 53b are fixed contacts 11a,
It opposes 13a and 12a, 13b so that it can contact and separate, respectively.

According to this embodiment, the end portion 3 of the movable iron piece 30 is
Since the movable contacts 52a, 52b and 53a, 53b are in a position projecting more forward than 2a and 32b, the radius of gyration of the movable contact pieces 52, 53 is longer. 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.

As shown in FIG. 4, the load spring 70 is formed by punching out and bending an elastic thin plate material and having elastic arm portions 71 and 72 having different width dimensions on both sides. Then, the locking claws 73, 73 facing inward are slid sideways into the locking grooves 16b of the support column 16 to lock the locking claws 73, and the retaining tongue pieces 75 prevent the shaft 44 of the movable block 60 from coming off. The locking claw 74 cut and raised from the partition wall 16 of the support 16
The attachment of the load spring 70 is completed by locking to c. As a result, the elastic arm portions 71 and 72 can alternately contact the protrusions 45 and 46 of the movable block 60, and the retaining tongue piece 75 prevents the shaft portion 44 from rattling and falling off.
The load spring 70 may be assembled from above.

The case 80 has a substantially box shape that can be fitted into the base 10. Then, after the sealant 91 is injected into the recess formed by fitting the case 80 to the base 10 and solidified, the internal gas is released from the gas vent hole (not shown) of the base 10, and the gas vent hole is melted by heat. Then, the assembly work is completed.

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 5 of the movable contact piece 52
2a and 52b are in contact with the fixed contacts 11a and 13a, while the movable contacts 53a and 53b are fixed contacts 12a and 13a.
The elastic arm 71 of the load spring 70 is in pressure contact with the protrusion 45 of the movable block 60.

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,
After the movable iron piece 30 rotates about the protrusion 31 as a fulcrum, the left end 32a of the movable iron piece 30 separates from the left magnetic pole portion 21a of the iron core 21, and then the right end 32b of the movable iron piece 30 moves to the iron core 2.
It is attracted to the right magnetic pole portion 21b of No. 1. Therefore, the movable contacts 52a and 52b of the movable contact piece 52 are fixed to the fixed contacts 11a and 1a.
After being separated from 3a, the movable contact 53 of the movable contact piece 53
The a and 53b come into contact with the fixed contacts 12a and 13b, and the elastic arm portion 72 of the load spring 70 comes into pressure contact with the protrusion 46 of the movable block 60.

When the excitation of the coil 26 is released,
Since the restoring force based on the movable contact pieces 53, 53 and the elastic arm portion 72 and the attraction area of the left magnetic pole portion 21a of the iron core 21 are wider than that of the right magnetic pole portion 21b, the movable iron piece 30 is returned to its original position. Upon return, the movable contacts 52a, 52b and 53a, 53b are switched to return to the original state.

According to this embodiment, the movable contact pieces 52, 53
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 52a may 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 70 is composed of the elastic arms 71 and 72 which act separately at the time of operation and at the time of returning, a desired load curve can be obtained by appropriately selecting the width dimension of the both. Easy to get. Therefore, it is easy to match the load curve of the load spring 70 with the substantially S-shaped attraction force curve based on the electromagnet block 20, and there is an advantage that the degree of freedom in design is large.

In the second embodiment, as shown in FIGS. 5 to 7, the elastic arms 71, 71 of the load spring 70 of the first embodiment described above are used.
This is the case where the elastic arm portion 72 extends only on one side, while the portion 72 extends in the opposite direction. The extending elastic arm portion 72 can alternately come into contact with the protrusions 45 and 46 protruding from the outer surface of the movable block 60. Since the other points are almost the same as those in the first embodiment, the description thereof will be omitted.

According to this embodiment, since the total length of the elastic arm portion 72 is shorter than that of the first embodiment, there is an advantage that the insulating characteristic is improved.

In the third embodiment, as shown in FIGS. 8 to 10, the above-mentioned embodiment has a straight elastic arm portion, whereas the elastic arm portion 76 having a substantially J-shaped plane is provided. This is a case where the plurality of protrusions 45 and 46 are alternately contacted. In particular, since the folded-back portion 77 of the elastic arm portion 76 abuts on the protrusion 45, the distance between the fulcrums of the elastic arm portion 76 becomes substantially long.

Therefore, according to the present embodiment, the load curve becomes even closer to the substantially S-shaped attraction force curve based on the electromagnet block 20, and there is an advantage that matching is facilitated.

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. . The load spring 70 may be detachably attached. Further, by arbitrarily selecting the shape of the load spring 70 or the position of the protrusion of the movable block,
The load curve may be changed.

[0041]

As is apparent from the above description, according to the electromagnetic relay of the first aspect of the present invention, the load spring is attached to the bearing portion of the base, and the elastic arm portion is attached to the outer surface of the movable block. Press contact with the protruding part. For this reason,
Even if the movable block rotates, a force that increases the gap between the insulating frame and the movable contact block does not act unlike the conventional example. As a result, there is no rattling in the movable block as in the conventional example, and therefore the operating characteristics do not deteriorate. Moreover, according to the second aspect, since the retaining tongue piece engages with the shaft of the movable block to prevent the retaining, it is possible to prevent rattling and dropout of the movable block during assembly. For this reason, unlike the conventional example, it is not necessary to provide the position control projections at the corners of the inner surface of the case, so that there is no so-called sink mark on the surface of the case, and it is troublesome to print on the surface of the case. It does not take. Further, according to claim 3, since the elastic arm portion of the load spring is supported in a cantilever manner, the total length of the load spring is shortened, and the insulation characteristic is improved. Further, according to the fourth aspect, since the elastic arm portion of the load spring is formed into a substantially J shape in a plane and the folded portion is pressed against the protrusion of the movable block, the distance between the fulcrums of the elastic arm portion is long. Therefore, by appropriately selecting the position of the protrusion of the movable block, a desired load curve can be easily obtained, and it is easy to match the suction force curve.

[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 enlarged perspective view of essential parts showing a first embodiment of the 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 a plan sectional view showing a second embodiment of the electromagnetic relay according to the present invention.

FIG. 7 is a front sectional view showing a second embodiment of the electromagnetic relay according to the present invention.

FIG. 8 is an exploded perspective view showing a third embodiment of the electromagnetic relay according to the present invention.

FIG. 9 is a plan sectional view showing a third embodiment of the electromagnetic relay according to the present invention.

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

[Explanation of symbols]

10 ... Base, 16 ... Struts, 16a ... Bearings, 20
... electromagnet block, 30 ... movable iron piece, 40 ... insulating frame,
44 ... Shaft, 45, 46 ... Projection, 50 ... Movable contact piece block, 60 ... Movable block, 70 ... Load spring, 71, 7
2, 76 ... elastic arm portion, 75 ... retaining tongue piece.

Claims (4)

[Claims] 1. A movable block is rotatably mounted on an upper surface of an electromagnet block provided on a base, and a shaft portion projecting from an opposing outer surface of the movable block is fitted to a bearing portion provided on the base. In the electromagnetic relay rotatably supported together, a load spring having an elastic arm portion press-contacting a protrusion provided on an outer surface of the movable block is provided in a bearing portion of the base. Electromagnetic relay. 2. The electromagnetic relay according to claim 1, wherein the load spring has a retaining tongue that engages with the shaft of the movable block. 3. The load spring has a cantilevered elastic arm portion which alternately comes into pressure contact with a plurality of protrusions provided on the outer surface of the movable block.
Electromagnetic relay described in. 4. The load spring has an elastic arm portion having a substantially J-shaped plane and having a folded portion that is in pressure contact with a protrusion provided on the outer surface of the movable block. The electromagnetic relay according to any one of 3 above.