JPH06203717A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To provide an electromagnetic relay which is composed of a less number of components, allows sealing uniformly, and presents a high locational accuracy of the terminals. CONSTITUTION:Terminals 13a, 22a, 21a, 23a, 13a are protruding at the confronting side faces of an electromagnet block 10. By means of outsert molding, split base pieces 24, 25 are formed in such a way that the middle parts of these terminals are coupled. The end faces of the base pieces 24, 25 are butted by folding the terminals 13a-13a at their base parts, and thereby a base 26 is formed.

Description

Detailed Description of the Invention

The present invention relates to an electromagnetic relay, and more particularly to an assembly structure thereof.

[0002]

2. Description of the Related Art Conventionally, as an assembly structure of an electromagnetic relay, for example, Japanese Patent Laid-Open No. 4-18 has been proposed.
There is an electromagnetic relay described in Japanese Patent No. 8530. That is,
A second base block is arranged between the coil block and the movable block, and the movable block is driven based on the excitation and demagnetization of the coil block to open and close the contacts.

However, since the electromagnetic relay requires separate first and second base blocks and has a large number of parts, the number of assembling steps is large and the assembling accuracy is low. In particular, since the common terminal and the fixed contact piece are provided on the different first and second base blocks, variations in operating characteristics are likely to occur. Further, in the electromagnetic relay, after engaging the terminal portion of the fixed contact piece with the protrusion provided on the side end surface of the first base block, the case is fitted to the first base block,
A sealant is injected, solidified and sealed. Therefore, it is difficult to provide a uniform seal due to the unevenness on the side end surface of the first base block. Further, since the fixed contact piece is insert-molded on the second base block, while the common terminal is insert-molded on the first base block, the positional accuracy, especially the pitch accuracy, of each terminal portion easily varies, and There is a problem that it takes time to mount on a board.

In view of the above problems, it is an object of the present invention to provide an electromagnetic relay which has a small number of parts, can be uniformly sealed, and has a high position accuracy of a terminal portion.

[0005]

In order to achieve the above object, the electromagnetic relay according to the present invention is outsert-molded so as to connect the intermediate portions of the terminal portions projecting laterally from the opposite side surfaces of the electromagnet block. The divided base pieces are formed by bending the terminal portions from their bases to abut each other to form a base. Further, the side end surface of the divided base piece facing the abutting surface may be a flat surface. Further, a guide groove may be provided on a side surface of the electromagnet block projecting from the terminal for fitting and positioning the bent terminal.

[0006]

Therefore, according to the first aspect of the present invention, since the base can be formed by the split base piece which is outsert-molded so as to connect the intermediate portions of the terminal portions, the number of parts is reduced as compared with the conventional example. It will be. Further, according to the second aspect, since the side end surface of the base formed by the divided base piece is not uneven, the sealing agent flows into and solidifies into a more uniform gap than in the conventional example. Further, according to the third aspect, the position of the bent terminal portion is regulated in the guide groove portion of the electromagnet block to be fitted.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an electromagnetic relay according to the present invention will be described with reference to the accompanying drawings of FIGS. As shown in FIGS. 1 to 9, the electromagnetic relay according to the first embodiment generally comprises an electromagnet block 10, a permanent magnet 30, a movable block 40, and a case 50.

In the electromagnet block 10, the lead frame 20 is insert-molded in the electromagnet portion 11 by the secondary molding, and at the same time, the divided base pieces 24 and 25 forming the base 26 are outsert-molded in the lead frame 20. .

That is, as shown in FIG. 5, the electromagnet portion 11 comprises a spool 14 formed by insert molding coil terminals 13, 13 connected by a substantially U-shaped iron core 12 and a connecting portion 13b. Is tsuba 1 at both ends
The first coil winding portion 14a and the second coil winding portion 14b are partitioned by a central flange portion 17 which has five and sixteen and which is provided in the central portion. Further, the inwardly facing surfaces of the bent and raised portions 12c and 12d located at both ends of the iron core 12 and the collar portion 1 of the spool 14
Voids 15a and 16a are respectively formed between the outward facing surfaces of 5 and 16 (the right void 16a is not shown in FIG. 2).

Then, the electromagnet portion 11 includes the spool 1
4, the connection portions 13b of the coil terminals 13, 13 insert-molded in the collar portions 15, 16 of 4 are cut off, and then,
Guide slits 1 provided on opposite side surfaces of the central collar portion 17
The coil 18 is continuously wound around the first coil winding portion 14a and the second coil winding portion 14b via 7a and 17b,
Furthermore, the coil terminal 13 with the lead wire left uncut,
It is manufactured by tangling and soldering the tang 13c located at the upper end of 13.

In this embodiment, the coil 18 is provided with guide slits 17a, 1a provided on the opposite side surfaces of the central collar portion 17.
Since the wires are routed through 7b, unlike the conventional case where the coils are routed so as to intersect through the intersecting guide groove portions provided on the upper end surface of the central collar portion, a rare short circuit or secondary molding is performed. It is possible to prevent disconnection at the time of. Moreover, since the coil 18 can be passed more easily than when the coil 18 is wired along the pair of parallel guide groove portions provided on the upper end surface of the central collar portion, the work efficiency is improved. Further, in this embodiment, since the permanent magnet 30 described later is attached later,
There is an advantage that the iron core 12 can be easily positioned through the center hole 14c, and insert molding can be facilitated.

In the present embodiment, the case where the iron core 12 having a substantially U-shaped cross section is used has been described. However, the present invention is not limited to this, and the present invention is applied when the substantially L-shaped iron core is used. May be.

In the electromagnet block 10, the electromagnet portion 11 around which the coil 18 is wound is positioned on the lead frame 20 shown in FIG. 7 which is formed by punching out the common terminal 21 and the fixed contact terminals 22 and 23 (FIG. 8). ) A coil 18 wound with a secondary-molded resin material is covered, the resin material is continuously injected and solidified in the voids 15a and 16a, and the coil terminals 13 and 13, the common terminal 21 and a fixed contact are provided. Each terminal portion 13a, 22a, 21a of the terminals 22, 23,
Split base piece 2 so as to connect the intermediate parts of 23a and 13a
After outsert molding 4, 25, the common terminal 21
It is manufactured by separating the fixed contact terminals 22 and 23 from the lead frame 20 (FIG. 9).

According to this embodiment, the coil 18 is covered with the resin material for secondary molding, and the voids 15a, 16a are formed.
Since the resin material is continuously poured and solidified, the adhesion area between the secondary molding portion and the spool 14 is increased as compared with the conventional example (shown by a thick solid line in FIG. 2). For this reason, not only is there a gap between the iron core 12 and the coil 18 due to heat shrinkage or the like, but even if a gap is created, the creepage distance is long, so that the gap between the iron core 12 and the coil 18 is long. The insulation does not drop sharply.

In FIG. 8, for convenience of explanation, the coil 1 is shown.
It shows a state in which the spool 14 before winding 8 is positioned on the lead frame 20. Fixed contacts 22b and 23b are provided on the lower surfaces of the free ends of the fixed contact terminals 22 and 23. Furthermore, instead of the secondary molding, if the secondary molded portion is fitted as a separate component, the insulating property similar to that described above can be obtained.

The permanent magnet 30 has a rectangular parallelepiped shape, and is inserted and fixed in a recess 17a formed by secondary molding on the lower surface of the central flange portion 17 (FIG. 2). Therefore, unlike the case where the permanent magnet 30 is integrated by insert molding, the permanent magnet 30 is not destroyed by the molding die, and the secondary molding is facilitated. Further, in this embodiment, since the permanent magnet 30 is attached later, the permanent magnet 30
If the product is defective, it can be easily replaced and the yield can be improved. Moreover, the operating characteristics can be easily adjusted by preparing several types of permanent magnets having different heights and arbitrarily selecting and assembling them. Furthermore, the permanent magnet 30 and the coil 1
8 has a merit that the creepage distance is long (shown by a thick solid line in FIG. 2) and the insulating property is improved.

Further, in this embodiment, since the magnetic balance is destroyed and the self-reset type is used, the movable block 40 described later is used.
The permanent magnet 30 is provided so that the rotation fulcrum and the axis of the permanent magnet 30 do not coincide with each other.

According to this embodiment, by changing the position of the recess 17a into which the permanent magnet 30 is inserted by secondary molding,
Since the magnetic balance and operating characteristics can be changed, there is an advantage that not only the design becomes easy, but also the shape of the iron core becomes simple and its processing becomes easy.

In the movable block 40, movable contact pieces 42, 42 are arranged in parallel on both sides of a movable iron piece 41 and integrated by a central support portion 43. Twin contact points are provided on the upper surfaces of both ends of the movable contact piece 42. Structured movable contacts 42a and 42b are provided respectively, and a substantially T-shaped connecting portion 42c protruding from the side surface of the central support portion 43 from the central portion of the movable contact piece 42.
Has been extended.

The one end 41b of the movable iron piece 41
After fixing the magnetic shield 44 to the upper surface of the
The protrusion 41c of the movable iron piece 41 exposed from the central recess 43a is positioned on the end face of the permanent magnet 30, and then the permanent magnet 30 is magnetized to adjust the operating characteristics.
The connecting portion 42c of the movable contact piece 42 is connected to the common terminal 21.
It is integrated by welding with the welded portion 21b. In addition, since the movable block 40 is of a self-returning type because the magnetic balance is lost, the protrusion 41c serving as a rotation fulcrum is arranged at a position deviated from the axis of the permanent magnet 30 (FIG. 2).

Further, the terminal portions 13a, 22a, 21a, 23a,
13a is bent downward from the base part thereof, and the terminal part 13a
13a to guide grooves 10a to 10 of the electromagnet block 10.
e and the side ends of the split base pieces 24 and 25 are abutted against each other to form the base 26, and then the box-shaped case 50 is fitted to the bottom surface of the base 26.
After 1 is injected, solidified and sealed, gas is vented from the gas vent hole 52 of the case 50 and heat sealed to complete the assembly.

According to this embodiment, the terminal portions 13a to 13a are fitted into the guide grooves 10a to 10e of the electromagnet block 10 and the positions thereof are regulated.
-13a The mutual positioning accuracy is high, and mounting on a printed circuit board does not take time. Moreover, the side end surfaces of the divided base pieces 24, 25 that form the base 26 by abutting with each other are flat surfaces, and a uniform gap is formed between the divided base pieces 24, 25 and the inner side surface of the case 50. The sealant 51 is injected and solidified in this gap. Therefore, there is an advantage that a uniform seal can be provided.

Next, the operation of the electromagnetic relay of this embodiment will be described. As shown in FIG. 2, since the protrusion 41c of the movable iron piece 41, which serves as the fulcrum of rotation, is not located on the axis of the permanent magnet 30 and is positioned at an eccentric position, the magnetic balance is lost. Therefore, in the case of non-excitation, the movable iron piece 41
One end portion 41a of the movable contact 42a is attracted to the magnetic pole portion 12a of the iron core 12, and the movable contact 42a is in contact with the fixed contact 22b, while the movable contact 42b is separated from the fixed contact 23b.

Then, when a voltage is applied to the coil 18 so as to cancel the magnetic flux of the permanent magnet 30 to excite it,
The other end 41b of the movable iron piece 41 is the magnetic pole portion 12b of the iron core 12.
Since the movable iron piece 41 is attracted to and is rotated against the magnetic force of the permanent magnet 30, the entire movable block 40 is rotated accordingly, and the movable contact 42a is separated from the fixed contact 22b. While contacting the fixed contact 23b, the other end 41b of the movable iron piece 41 is attracted to the magnetic pole portion 12b of the iron core 12 via the magnetic shield 44.

Then, when the excitation is released, the magnetic balance is lost as described above. Therefore, the movable block 40 is reversed by the spring force of the movable contact piece 42 and the magnetic force of the permanent magnet 30 to return to the original state. To do.

In the second embodiment, as shown in FIGS. 10 to 12, the first embodiment described above is a case where the terminal portions 13a to 13a are inserted into the through holes of the printed circuit board for mounting. This is a case where the bent terminal portions 13a to 13a are surface-mounted on the printed board. Note that 50a to 50e
Is a notched concave portion for fitting the terminal portions 13a to 13a, respectively. With these, the terminal portions 13a to 13
There is an advantage that the positioning accuracy of a is further improved.

According to the present embodiment, after the sealing material is injected, solidified and assembled as in the conventional example, the intermediate portion of the terminal portion protruding downward is not bent sideways using a jig. Since the terminal portion has already been bent to the side before sealing, the upper surface of the terminal portion is in the vicinity of or in contact with the lower surface of the opening edge portion of the case (Fig. 12), and the upper surface of the terminal portion and the opening edge portion of the case Since there is almost no gap between them, there is an advantage that a short electromagnetic relay can be obtained.

In this embodiment, the terminal portions 13a, 22a, 2
Although the secondary molding is performed in a state in which the tips of the steps 1a, 23a and 13a provided with the steps are bent and bent, the shape is not necessarily limited to this, and the terminal portions 13a and 22 are similar to the first embodiment described above.
The tips of a, 21a, 23a, and 13a may be secondarily formed without bending and then stepped, and then bent and bent.

In the above embodiment, the case of the self-reset type is explained, but the present invention is not limited to this, and for example, by making the axis of the permanent magnet and the pivot of the movable block coincide with each other, It may be a holding type.

[0030]

As is apparent from the above description, according to the electromagnetic relay of the first aspect of the present invention, the base is formed by the divided pieces which are outsert-molded so as to connect the intermediate portions of the terminal portions. The number of parts and the number of assembling steps are reduced as compared with the conventional example, which is less laborious, the assembling accuracy is improved, and the operation characteristics are not varied. Moreover, claim 2
According to the above, since the side end surface of the base composed of the divided base pieces becomes a flat surface, the gap formed between the side surface of the base and the inner side surface of the case becomes more uniform than in the conventional example, and uniform sealing is achieved by injecting the sealing agent. can get. Further, according to claim 3, the terminal portion is fitted into the guide groove portion of the electromagnet block and the position of the terminal portion is regulated. The terminal portions facing each other are not displaced from each other, and the positional accuracy of the terminal portion is high. The effect is that it is easy to implement.

[Brief description of drawings]

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

FIG. 2 is a front cross-sectional view showing an electromagnetic relay according to the first embodiment.

FIG. 3 is a side sectional view showing an electromagnetic relay according to the first embodiment.

FIG. 4 is a bottom cross-sectional view showing the electromagnetic relay according to the first embodiment.

FIG. 5 is a perspective view showing a spool of the electromagnetic relay according to the first embodiment.

FIG. 6 is a perspective view from a different angle in FIG.

FIG. 7 is a perspective view showing a lead frame of the electromagnetic relay according to the first embodiment.

FIG. 8 is a perspective view showing an assembly process of the electromagnetic relay according to the first embodiment.

FIG. 9 is a perspective view showing an electromagnet block of the electromagnetic relay according to the first embodiment.

FIG. 10 is an exploded perspective view showing an electromagnetic relay according to a second embodiment.

FIG. 11 is a front sectional view showing an electromagnetic relay according to a second embodiment.

FIG. 12 is a side sectional view showing an electromagnetic relay according to a second embodiment.

[Explanation of symbols]

10 ... Electromagnet block, 10a-10e ... Guide groove,
13 ... Coil terminal, 21 ... Common terminal, 22, 23 ... Fixed contact terminal, 13a, 21a, 22a, 23a ... Terminal part,
24, 25 ... Disassembled base piece, 26 ... Base.

Claims (3)

[Claims] 1. A split base piece, which is outsert-molded so as to connect an intermediate portion of a terminal portion protruding laterally from opposite side surfaces of an electromagnet block, is abutted to each other by bending the terminal portion from its base portion. An electromagnetic relay characterized by forming a base. 2. The electromagnetic relay according to claim 1, wherein a side end surface of the split base piece facing the abutting surface is a flat surface. 3. A guide groove portion for fitting and positioning the bent terminal portion is provided on a side surface of the electromagnet block projecting from the terminal portion.
Electromagnetic relay described in.