JPH08235988A - Electromagnetic relay - Google Patents

Abstract

PURPOSE: To provide an electromagnetic relay with no dispersion of operating characteristics, and easy to automate forming work, the manufacture of a forming die, and assembly. CONSTITUTION: A flat, almost U-shaped insulating wall 11 is integrally formed in the upper center of a base 10. An electromagnet 20 formed by winding a coil 25 around an iron core 30 is arranged on the upper surface of the base 10 so that its one end is surrounded by the insulating wall 11. A contact mechanism 50 is arranged on the upper one side of the base 10 partitioned from one end of the electromagnet 20 with the insulating wall 11. An insulating cover 60 is fit to the upper opening end of the insulating wall 11 for fixing and covering. The contact mechanism 50 is driven with a card 70 which reciprocates in the axial center direction in the upper part of the insulating cover 60, based on the excitation and demagetization of the electromagnet 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay having excellent insulation characteristics, and more particularly to an electromagnetic relay in which other components can be assembled on a base from above.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic relay having excellent insulation characteristics, for example, as shown in FIG. 16, a cylindrical frame 1a having one side closed is integrally formed at a substantially central portion of a base 1. The electromagnet part 2 having the movable iron piece 2b assembled through the hinge spring 2a is inserted into the hollow portion 1b of the body 1a from the lateral side along the axial center, and is fixed to one side of the base 1 partitioned by the frame body 1a. The contact terminals 5, 6 and the movable contact terminal 7 are press-fitted and fixed from the side, and then one end 8a of the card 8 is engaged with the upper end 2c of the movable iron piece 2b, while the other end 8b is movable. Elastic contact piece 7c forming the contact terminal 7
There is one that is supported by the upper end portion 7d of the above so as to be capable of reciprocating (Japanese Patent Laid-Open No. 5-325760). In addition, 9 is a case having a box shape that can be fitted to the base 1,
The fixed contact terminals 5, 6 and the movable contact terminal 7 are provided with fixed contacts 5b, 6b and a movable contact 7b at high positions apart from the respective terminal portions 5a, 6a and 7a.

Then, when the movable iron piece 2b is attracted to and separated from the iron core 2d of the electromagnet portion 2 based on the excitation and demagnetization of the electromagnet portion 2, the card 8 is reciprocally moved by this, and the other end portion 8b. Presses and releases the upper end 7d of the elastic contact piece 7c, so that the movable contact 7b is fixed to the fixed contacts 5b and 6b.
The circuit is opened and closed by alternately connecting and disconnecting.

[0004]

However, in the above-mentioned electromagnetic relay, the cavity 1b of the frame 1a provided on the base 1 is provided.
The electromagnet portion 2 is inserted laterally along the axis, and the fixed contacts 5b and 6b and the movable contact 7b partitioned by the frame 1a are arranged in front of the insertion direction. Therefore, although the assembly accuracy of the electromagnet portion 2 with respect to the base 1 directly affects the movement amount of the card 8, the base 1
Since it is not easy to assemble the electromagnet section 2 with high accuracy, the operating characteristics tend to vary. Further, since the base 1 needs to integrally mold the frame 1a and has a complicated shape, the molding is not easy and
It is difficult to manufacture molding dies. Further, since it is necessary to insert the electromagnet portion 2 into the base 1 from the lateral side along the axis, which is different from the assembling direction of other components, the arrangement of the automatic assembling machine in the assembling line becomes complicated, and the assembling is automated. There is a problem in that it takes time.

In view of the above problems, it is an object of the present invention to provide an electromagnetic relay which does not cause variations in operating characteristics and facilitates automation of molding work, manufacturing of a molding die and assembly.

[0006]

In order to achieve the above-mentioned object, an electromagnetic relay according to the present invention comprises a base integrally formed with a substantially U-shaped planar insulating wall at the center of the upper surface, and a coil wound around an iron core. An electromagnet portion formed on the upper surface of the base so as to surround one end side with the insulating wall; and a contact mechanism portion disposed on one side of the upper surface of the base partitioned from the one end side of the electromagnet portion by the insulating wall. An insulating cover fitted and fixed to the upper opening edge portion of the insulating wall to cover the insulating wall, and reciprocally moves above the insulating cover in the axial direction based on the excitation and demagnetization of the electromagnet portion to form the contact mechanism. It is composed of a card to be driven.

The insulating cover has a substantially V-shaped cross section, and its vertical portion covers at least the center outer surface of the insulating wall to divide the electromagnet portion and the contact mechanism portion into two layers. Alternatively, a pair of protrusions may be provided on the lower surface of the insulating cover for sandwiching the end side surface of the iron core exposed from the electromagnet portion.

At least one protrusion may be provided on the upper surface of the insulating cover to abut and support the ceiling surface of the case to secure the reciprocating movement of the card.

Further, the electromagnet part may be pressed against the base to be positioned by the insulating cover having a protrusion on the upper surface which is in pressure contact with the ceiling surface of the case fitted to the base.

At least one guide protrusion for guiding the reciprocating movement of the card may be provided on the upper surface of the insulating cover, or the upper surface of the insulating cover may be brought into contact with the card when returning. You may provide the protrusion part which regulates a position.

[0011]

Therefore, according to the first aspect of the present invention, the electromagnet portion can be assembled from above on the upper surface of the base partitioned by the insulating wall. Therefore, the electromagnet portion can be positioned with higher assembly accuracy with respect to the contact mechanism portion than in the conventional example, and variations in the amount of movement of the card do not occur, so variations in operating characteristics are eliminated. Further, since it is not necessary to integrally form the tubular frame body on the base as in the conventional example,
The shape of the base is simpler than that of the conventional example, and the molding of the base and the manufacturing of the molding die are facilitated. Further, like the other components, the electromagnet portion can be assembled to the base from above, so that the automatic assembly machine can be arranged easily and the assembly line can be easily automated.

According to the second aspect, since the electromagnet portion and the contact mechanism portion are doubly partitioned, the creepage distance between them is increased, and the insulation characteristic is further improved.

According to the third aspect of the present invention, the pair of protrusions provided on the insulating cover hold the side surfaces of the end portions of the iron core to regulate the position of the electromagnet portion. Therefore, rattling in the width direction of the electromagnet portion can be prevented, and the assembling can be prevented. Accuracy is improved.

According to the fourth aspect, the projection provided on the upper surface of the insulating cover abuts and supports the ceiling surface of the case. Therefore, even if an external force is applied to the case, the projecting portion receives the external force and prevents the ceiling surface of the case from coming into contact with the card, thereby ensuring the reciprocating movement of the card.

According to the fifth aspect of the present invention, the electromagnet portion is pressed and positioned by the insulating cover having an upper surface having a protrusion that comes into pressure contact with the ceiling surface of the case fitted to the base. Therefore, the position of the electromagnet portion is regulated in the vertical direction, rattling does not occur in the vertical direction, and highly accurate assembly becomes possible.

According to the sixth aspect, the card is brought into contact with the guide projection provided on the upper surface of the insulating cover to regulate the position of the card. Therefore, there is no variation in operating characteristics, and the card does not fall off the insulating cover.

According to the seventh aspect, the card stops at a predetermined position when returning. Therefore, the movement amount of the card is stable, the movement amount of the movable contact does not vary, and the operation characteristics are uniform.

[0018]

Embodiments of the present invention will be described below with reference to the accompanying drawings of FIGS. The electromagnetic relay according to the first embodiment, as shown in FIGS.
It is composed of a base 10, an electromagnet section 20 in which a movable iron piece 40 is assembled via a hinge spring 45, a contact mechanism section 50, an insulating cover 60, a card 70, and a case 80.

The base 10 has a fitting recess 12 formed by integrally molding a substantially U-shaped insulating wall 11 in the center of its upper surface. The fitting recess is formed in the center of the inner surface of the insulating wall 11. An engaging groove 13 communicating with 12 and capable of slidingly engaging an iron core 30 of the electromagnet portion 20 described later is provided in the up-down direction. Further, the base 10 has terminal holes 14 and 15 into which fixed contact terminals 51 and 52, which will be described later, can be press-fitted from above into a portion of the upper surface located outside the engagement groove 13.
In addition to these, terminal holes (not shown) which are adjacent to these via the partition wall 16 and into which the movable contact terminal 53 can be press-fitted from above are provided. Furthermore, base 1
Reference numeral 0 denotes a conveyance guide at the end of the upper surface of the upper surface located on the opposite side of the terminal holes 14 and 15, and a protrusion 17 for positioning an electromagnet portion 20 described later is provided. In addition, 18 and 18 are terminal holes of the coil terminal 28.

The electromagnet portion 20 has a coil 2 on a body portion 24 (see FIG. 4) of a spool 23 having collar portions 21 and 22 at both ends.
5 is wound, the one arm portion 31 of the iron core 30 bent in a substantially U-shaped cross section is inserted into the center hole 24a provided in the body portion 24, and the protruding tip portion is the magnetic pole portion 31a, and the tip of the remaining one arm portion 32. The portion is the magnetic pole portion 32a.

The spool 23 has a fall prevention projection 26 laterally projecting from the lower edge of the collar 21, and a terminal of a pedestal 27 provided at the lower edge of the collar 22. The coil terminal 2 is provided in the hole 27a (the terminal hole on the rear side is not shown).
8 is press-fitted and fixed, and a lead wire of the coil 25 is twisted and soldered to the upper end of the coil terminal 28. In addition, the protrusion 26 for preventing the depression
Prevents the collar portion 21 of the spool 23 from dropping and catching at the joint of the belt conveyor when the electromagnet portion 20 is conveyed by the belt conveyor in the assembly line,
The purpose is to prevent damage to the spool 23 and disconnection of the coil 25.

As shown in FIGS. 6 to 8, the iron core 30 is formed by punching out a hoop material 90 made of a thick band-shaped material, bending the hoop material 90 into a substantially U-shaped cross section, and then separating the hoop material. A pair of positioning ribs 34, 34 protrude from both side surfaces of the portion 33. It should be noted that, of the one arm portions 31 and 32 of the iron core 30, one of the one arm portions 32 has a widened tip, which reduces the magnetic resistance. Further, a shallow recessed portion 31b for locking a hinge spring 45 described later is formed near the magnetic pole portion 31a of the one-arm portion 31.

The movable iron piece 40 is formed by punching out a plate-shaped magnetic material and bending the lower end portion thereof toward the inward surface to form a taper surface 41, which is attracted to the wide magnetic pole portion 32a of the iron core 30. A wide portion 42 is formed as a portion, and a pair of cutout portions 43, 43 is provided on both upper end surfaces of the wide portion 42.

As shown in FIG. 4, the hinge spring 45 is made of a thin leaf spring material bent in a substantially V-shaped cross section, and its vertical portion 46 is fixed to the back surface of the movable iron piece 40. Then, the horizontal portion 47 of the hinge spring 45 is press-fitted into the gap between the inner peripheral surface of the center hole 24a provided in the spool 23 and the lower surface of the one arm portion 31 of the iron core 30, and the horizontal portion 47 of the hinge spring 45 is inserted into the horizontal portion 47. The elastic claw portion 48 formed by cutting and raising is locked to the shallow recessed portion 31b provided on the lower surface of the one arm portion 31,
The movable iron piece 40 is rotatably supported by being prevented from coming off.

According to this embodiment, the tapered surface 41 of the movable iron piece 40 is always in line contact with the lower edge of the end surface of the magnetic pole portion 31a. Therefore, even if the movable iron piece 40 rotates, the rotation fulcrum does not move, and the operation characteristics are stable. As a result, it is not necessary to form a difficult-to-process tapered surface on the end surface of the magnetic pole portion 31a of the iron core 30, which is advantageous in that the iron core 30 can be easily manufactured.

Then, the electromagnet portion 20 assembled with the movable iron piece 40 via the hinge spring 45 is fitted into the fitting concave portion 12 of the base 10 from above, and at the same time, the spool 2
3 and the ribs 34, 34 of the iron core 30 are sequentially fitted into the engaging groove 13 and assembled. According to the present embodiment,
The ribs 34, 34 provided on the bent portion 33 of the iron core 30 are slidably engaged with the engagement groove 13 of the spool 23 from above, which is advantageous in that the electromagnet portion 20 can be assembled to the base 10 with high accuracy.

The contact mechanism section 50 includes a pair of fixed contact terminals 5
1, 52 and the movable contact terminal 53, the fixed contacts 51a, 52a of the fixed contact terminals 51, 52 are
It is provided at a low position near each of the terminal portions 51b and 52b.

On the other hand, as shown in FIG. 9, the movable contact terminal 53 has a separate gate-shaped elastic contact piece 54 fixed by caulking to the upper end of the terminal portion 53b. The elastic contact piece 54 comprises an elastic base portion 54a, an elastic upper side portion 54b and an elastic vertical portion 54c. The elastic upper side portion 54b
The whole is bent horizontally, while the elastic vertical portion 54c is provided with a fixed contact 53a and a through hole 53c. According to the present embodiment, since the elastic vertical portion 54c can be rotated from its base, the effective length of the elastic vertical portion 54c is long and easily deformed even when the height dimension is limited. . Therefore, it is possible to obtain an electromagnetic relay that can open and close the contacts by driving the elastic vertical portion 54c with a relatively small pressing force. Further, since the effective length of the elastic contact piece 54 is long, the exposed area is large and the heat dissipation is excellent. The movable contact terminal 53 is obtained. Further, the elastic contact piece 54
Since the overall effective length is long and the desired spring constant is easily obtained, the plate thickness of the elastic contact piece 54 can be increased. Therefore, there is an advantage that the elastic contact piece 54 is not deformed during the work such as caulking and the work is easy.

The movable contact piece 53 is not limited to the one described above. For example, as shown in FIG. 10, only the front edge portion of the elastic upper side portion 54b of the elastic contact piece 54 is horizontally bent to be vertical. By forming the portion 54d, the elastic upper side portion 54b may have a substantially V-shaped cross section. According to this, since the rigidity of the elastic upper side portion 54b is large, the elastic vertical portion 54c is less likely to be twisted, and the elastic vertical portion 5b.
4c can be rotated at an accurate angle. Further, there is an advantage that a complicated stress is not generated in the elastic vertical portion 54c and the contact can be opened and closed by driving the elastic contact piece 54 with a relatively small pressing force. Others are the same as those of the movable contact piece 53 described above, and thus the description thereof will be omitted.

Then, the terminal portions 51b and 52b of the fixed contact terminals 51 and 52 and the terminal portion 53b of the movable contact terminal 53.
Are press-fitted into the terminal holes 14 and 15 provided in the base 10 (the terminal holes of the movable contact terminal 53 are not shown), so that the movable contact 53a is formed between the fixed contacts 51a and 52a facing each other at a predetermined interval. It is located so that it can come in and out. According to this embodiment, the fixed contacts 51a and 52a and the movable contact 53a are provided.
Are arranged in the vicinity of the respective terminal portions 51b, 52b and 53b and are at a low position, so that the fixed contacts 51a, 52a
And the movable contact 53a is located near the upper surface of the base 10. Therefore, for example, even if the fixed contact terminals 51, 52 and the movable contact terminal 53 are tilted due to thermal deformation of the base 10, the fixed contacts 51a, 52a and the movable contact 53a.
There is an advantage that the fluctuation of the operating characteristics can be prevented by the deviation of the fixed contacts 51a, 52a and the movable contact 53a from each other.

The insulating cover 60 is a resin-molded product having a substantially V-shaped cross section, and is for insulating the contact mechanism section 50 from the electromagnet section 20. Projection 6 for restricting the return position
1. A protrusion 62 for ensuring the reciprocating movement of the card 70 is provided, and a guide protrusion 63 for guiding the card 70 to prevent the card 70 from falling off is provided at the corner of the upper surface of the horizontal portion 60a. Further, as shown in FIG.
On the lower surface of the horizontal portion 60a, a pair of projecting portions 64, 64 for sandwiching the bent portion 33 of the iron core 30 and a projection 65 for press-contacting the upper surface of the one arm portion 32 of the iron core 30 are provided.

Then, when the insulating cover 60 is fitted and fixed to the insulating wall 11 of the base 10 incorporating the electromagnet portion 20, the protruding portions 64, 64 of the insulating cover 60 hold the bent portion 33 of the iron core 30, and The ribs 34, 34
While pushing down to regulate the position,
The one arm 31 of 0 is pressed against the upper surface of the one arm 31 to prevent coming off.

According to this embodiment, since the vertical portion 60b of the insulating cover 60 overlaps the insulating wall 11 of the base 10 to form a double wall structure, the creeping distance between the electromagnet portion 20 and the contact mechanism portion 50 becomes long. The advantage is that the insulation characteristics are further improved.

The slide type card 70 is a synthetic resin molded product having a substantially rectangular shape in plan view, and has a rectangular fitting hole 71 in the center thereof. And the sliding card 70 is
The long tongue piece 72 extends downward from the center of one of the tip surfaces,
A fitting protrusion 73 and a pressing protrusion 74 are provided on the lower side thereof, while a drive projection 75 is provided at the center of the other end surface, and a pair of elastic engagement legs 76, 76 are provided from both sides thereof.
Is protruding.

Further, the card 70 is provided with a guide rail projection 77 on the lower surface thereof along the width direction. The ridges 77 prevent the cards 70 from falling off when the cards 70 are slid along a guide rail (not shown), and are aligned in the same direction, but are not necessarily limited to this. , 70 may be provided on the upper surface of the card 70, or two protrusions may be provided on the same straight line and substituted. According to this embodiment, at least one of the long tongue piece 72 and the ridge 77 is locked to the edge of the guide rail, and the cards 70 are automatically aligned in the same direction. The advantage is that the automation of the assembly becomes even easier.

Then, while the fitting projection 73 of the slide type card 70 is inserted into the through hole 53c of the movable contact terminal 53, the movable iron piece 4 is inserted between the pair of elastic engaging leg portions 76, 76.
The card 70 is supported so as to be capable of reciprocating by positioning 0, pushing it, and engaging the notches 43, 43. According to this embodiment, the long tongue piece 72 extends downward from the center of the end surface of the card 70, and the fitting projection 73 and the pressing projection 74 are provided on the lower side, so that vibration and impact force from the outside can be prevented. Even if added, the long tongue piece 72 absorbs and relaxes. Therefore, the long tongue piece 72 prevents malfunction due to vibration or the like, resulting in high reliability. In addition, the contact mechanism unit 50
Since the structure of is not limited, there is an advantage that the degree of freedom in design is large.

As shown in FIG. 2, the case 80 has a box shape that can be fitted to the base 10, has a gas vent hole 81 at one side edge portion of its ceiling surface, and is generated during use. Protrusions 82 are provided that can be broken off to remove a nitric acid gas to form a gas vent hole.

Then, when the case 80 is fitted to the base 10 incorporating the internal components such as the electromagnet section 20,
As shown in FIG. 4, the lower surface of the ceiling of the case 80 is pressed against the protrusion 62 of the insulating cover 60, and the protrusion 65 of the insulating cover 60 presses the one arm portion 32 of the iron core 30 to regulate the position. Then, the sealant 83 is injected into the bottom surface of the base 10, solidified and sealed, the internal gas is discharged from the gas vent hole 81, and the gas vent hole 81 is heat-melted and sealed to complete the assembly work. To do.

According to this embodiment, since the case 80 presses the iron core 30 via the protrusions 62 and the protrusions 65 of the insulating cover 60, the iron core 30 can be prevented from coming off and the ceiling surface of the case 80 can be prevented. Even if an external force is applied, the protrusion 62 and the protrusion 65 of the insulating cover 60 receive the external force, so that the ceiling surface of the case 80 is less likely to bend, and the reciprocating movement of the card 70 is not hindered.

The operation of the electromagnetic relay having the above configuration will be described. As shown in FIG. 4, when the electromagnet component 20 is non-excited, the spring force of the elastic contact piece 54 of the movable contact terminal 53 biases the card 70 toward the movable iron piece 40,
The inner surface of the fitting hole 71 is brought into contact with the protrusion 61 of the insulating cover to regulate the position, and the movable contact 53a is in contact with the fixed contact 51a.

When a voltage is applied to the coil 25 of the electromagnet portion 20 to excite it, the magnetic pole portion 32a of the iron core 30 attracts the movable iron piece 40, and the lower edge of the end face of the magnetic pole portion 31a of the iron core 30 is used as a fulcrum. The movable iron piece 40 is rotated to the wide portion 4 thereof.
2 is attracted to the magnetic pole portion 32a of the one arm portion 32. For this reason,
The movable iron piece 40 presses the driving projection 75 of the card 70, the card 70 slides toward the contact mechanism section 50 side against the spring force of the movable contact piece 54, and the pressing projection provided on the long tongue piece 72. 74 presses the elastic contact piece 54 of the movable contact terminal 53, and the movable contact 53a switches from the fixed contact 51a to the fixed contact 52a.

Next, when the excitation of the electromagnet portion 20 is released, the card 70 is pushed back by the spring force of the movable contact piece 54, and the wide portion 42 of the movable iron piece 40 causes the magnetic pole portion 32 of the iron core 30.
a to separate the card 70 from the protrusion 61 of the insulating cover 70.
The inner surface of the fitting hole 71 comes in contact with and returns to the original position, and the movable contact 53a switches to the fixed contact 51a to return to the original state.

According to the present embodiment, the position of the card 70 is regulated by the one protrusion 61 and the four guide protrusions 63 provided on the insulating cover 60, so that the operating characteristic does not vary and the insulating cover 60 falls off. do not do. Further, according to the present embodiment, since the tapered surface 41 is formed on the movable iron piece 40 in order to prevent the rotation fulcrum from moving, it is not necessary to form the tapered surface on the end surface of the magnetic pole portion 31a which is difficult to process. ,
There is an advantage that the iron core 30 can be easily manufactured.

In order to prevent the card 70 from falling off, it is not necessary to provide the projection 61 and the four projections 63, and only the projection 61 may be provided, or
The protrusion 61 and the two protrusions 63 may be provided.

Alternatively, a pair of facing guide protrusions may be provided on the upper surface of the horizontal portion 60a of the insulating cover 60, and the card 70 may be reciprocally disposed between these guide protrusions to open and close the contacts.

Further, the horizontal portion 60 of the insulating cover 60
By pressing the card 70 from above between the pair of opposing elastic claws protruding from the upper surface of a and mounting it, not only the horizontal direction but also the vertical position regulation may be performed at the same time.

The horizontal portion 60a of the insulating cover 60
One U-shaped protrusion of a front substantially gate shape is formed on the upper surface of the, or a plurality of U-shaped protrusions of a substantially front gate shape is formed on the upper surface of the horizontal portion 60a of the insulating cover 60 on the same straight line. By inserting the card in the protrusion, not only in the horizontal direction,
Vertical position regulation may be performed at the same time.

The position of the card 70 is not limited to the protrusion provided on the upper surface of the horizontal portion 60a of the insulating cover 60, but one or a plurality of protrusions provided on the ceiling surface of the case 80 may be used. Alternatively, one provided on the ceiling surface of the case 80 and the upper surface of the horizontal portion 60a of the insulating cover 60, or
The position may be regulated via a plurality of protrusions and projections.

In the second embodiment, as shown in FIG. 12, the first embodiment described above secures the reciprocating movement of the card 70 by the projection 62 provided on the upper surface of the horizontal portion 60a of the insulating cover 60. On the other hand, it is a case in which the reciprocating movement of the card 70 is ensured by the protrusion 61 that regulates the position of the card 70 at the time of return. The other points are the same as those in the above-described first embodiment, and the description thereof will be omitted.

In the third embodiment, as shown in FIG. 13, the card 70 can be assembled in one direction from above. That is, the long tongue piece 72 extends horizontally from the central portion of the front end surface of the card 70, and the fitting projection 73 is provided on the lower surface of the front end portion thereof while the through hole 53c is formed in the elastic upper side portion 54b of the movable contact terminal 53. It is provided. Then, when the card 70 is pushed down from above, the fitting protrusion 73 of the card 70 is fitted into the through hole 53c of the movable contact terminal 53, and the elastic engagement legs 76, 76 of the card 70 are notched in the movable iron piece 40. By engaging the parts 43, 43,
The card 70 is supported so as to be reciprocally movable. The other points are the same as those in the above-described first embodiment, and the description thereof will be omitted.

As shown in FIG. 14, the fourth embodiment is almost the same as the above-mentioned first embodiment, except that the card 7 is different.
The point is that the elastic base portion 54a of the elastic contact piece 54 is caulked to the mounting portion 53d of the terminal portion 53b so that the pressing force of 0 acts on the caulking member as a shearing force. According to the present embodiment, even if the elastic base portion 54a is a thin leaf spring material, the portion fixed by crimping is less likely to be plastically deformed, and the elastic contact piece 54 does not rattle, so that the rotation fulcrum of the elastic vertical portion 54c. Does not move, and the operating characteristics are stable.

In the fifth embodiment, as shown in FIG. 15, the first embodiment has a normally closed fixed contact terminal 51, but instead of this, a dummy fixed contact having no terminal portion is used. This is the case where the terminal 55 is provided. The dummy fixed contact terminal 55 has a dummy contact 55a formed by an extrusion process. According to this embodiment, the dummy fixed contact terminal 55
Since the electromagnetic relay having the fixed contact terminal 52 for normal opening can be obtained by using the other components except the above, there is an advantage that different kinds of electromagnetic relays can be manufactured with a small number of parts.

[Brief description of drawings]

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

2 is a perspective view showing a case of the electromagnetic relay shown in FIG. 1. FIG.

3 is a plan sectional view of the electromagnetic relay shown in FIG.

FIG. 4 is a front sectional view of the electromagnetic relay shown in FIG. 1.

5 is a partial rear cross-sectional view of the electromagnetic relay shown in FIG.

FIG. 6 is a plan view showing a hoop material obtained by punching out an iron core according to the first embodiment of the present invention.

7 is a plan view showing a hoop member obtained by bending the iron core of FIG.

8 is a sectional view taken along line VIII-VIII of FIG.

9A and 9B show a fixed contact terminal according to the first embodiment of the present invention, wherein FIG. 9A is a plan view, FIG. 9B is a left side view, FIG. 9C is a front view, and FIG. It is a side view.

10A and 10B show a modification of the fixed contact terminal according to the present invention, in which FIG. 10A is a plan view, FIG. 10B is a left side view, FIG. 10C is a front view, and FIG. Is.

FIG. 11 is an exploded perspective view for explaining a method of assembling the insulating cover according to the present invention.

FIG. 12 is an exploded perspective view showing a second embodiment of the electromagnetic relay according to the present invention.

FIG. 13 is an exploded perspective view showing a third embodiment of the electromagnetic relay according to the present invention.

FIG. 14 is an exploded perspective view showing a fourth embodiment of the electromagnetic relay according to the present invention.

FIG. 15 is an exploded perspective view showing a fifth embodiment of the electromagnetic relay according to the present invention.

FIG. 16 is an exploded perspective view showing an electromagnetic relay according to a conventional example.

[Explanation of symbols]

10 ... Base, 11 ... Insulating wall, 12 ... Fitting recess, 13 ...
Engagement groove, 20 ... Electromagnet part, 21, 22 ... Tsuba, 23 ... Spool, 25 ... Coil, 26 ... Fall prevention projection, 30
... Iron core with substantially U-shaped cross section, 31, 32 ... One arm, 31a, 3
2a ... Magnetic pole part, 33 ... Bent part, 34 ... Rib, 40 ...
Movable iron piece, 41 ... Tapered surface, 45 ... Hinge spring, 50 ...
Contact mechanism section, 51, 52 ... Fixed contact terminal, 51a, 52
a ... Fixed contact, 51b, 52b ... Terminal part, 53 ... Movable contact terminal, 53a ... Movable contact, 53b ... Terminal part, 54 ... Elastic contact piece, 54a ... Elastic base part, 54b ... Elastic upper side part, 5
4c ... Elastic vertical part, 60 ... Insulation cover, 60a ... Horizontal part, 60b ... Vertical part, 61 ... Projection part, 62 ... Projection part, 63 ...
Guide protrusion, 64 ... Projection portion, 65 ... Protrusion, 70 ... Card, 72 ... Long tongue portion, 73 ... Fitting protrusion, 74 ... Pressing protrusion,
77 ... Ridge for guide rail.

Claims (7)

[Claims] 1. A base integrally formed with a substantially U-shaped insulating wall in the center of the upper surface, and a coil wound around an iron core. The base is disposed on the upper surface of the base so as to surround one end side with the insulating wall. An electromagnet section, a contact mechanism section arranged on one side of the upper surface of the base partitioned from one end side of the electromagnet section by the insulating wall, and insulation that is fitted and fixed to the upper opening edge of the insulating wall. Reciprocating in the axial direction above the insulating cover based on the excitation and demagnetization of the cover and the electromagnet section,
An electromagnetic relay comprising a card for driving the contact mechanism. 2. The insulating cover has a substantially V-shaped cross section, and a vertical portion thereof covers at least a central outer side surface of the insulating wall to divide the electromagnet portion and the contact mechanism portion into double layers. The electromagnetic relay according to claim 1, wherein: 3. The electromagnetic relay according to claim 1, wherein the insulating cover has a lower surface provided with a pair of projecting portions for sandwiching an end side surface of the iron core exposed from the electromagnet portion. 4. The upper surface of the insulating cover is provided with at least one protrusion that abuts and supports the ceiling surface of the case to secure the reciprocating movement of the card. The electromagnetic relay according to any one of 1. 5. The electromagnet part is positioned by pressing the electromagnet part against the base by the insulating cover having a protrusion on the top surface that is in pressure contact with the ceiling surface of the case fitted to the base. The electromagnetic relay according to any one of 1. 6. The electromagnetic relay according to claim 1, wherein at least one guide protrusion that guides the reciprocating movement of the card is provided on the upper surface of the insulating cover. 7. The electromagnetic relay according to claim 1, further comprising a protrusion provided on the upper surface of the insulating cover to restrict the position of the card when the card is restored.