JPH0561738B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to an electromagnetic relay that turns on and off contacts by swinging an armature using a polarized electromagnetic block. (Prior art and its problems) Conventionally, as one of the above-mentioned electromagnetic relays, a permanent magnet is arranged approximately at the center of an iron core made of a substantially rectangular plate material, and a coil is wound around the iron core via a spool. The armature includes a pole electromagnetic block and an armature supported by the permanent magnet and having both ends facing both ends of the iron core with an action space, and the armature is oscillated by applying a current to the coil. A device with a contact that turns on and off was published in Japanese Patent Application Laid-Open No. 1987-
This is proposed in Publication No. 143235. In this device, a permanent magnet, an iron core, and an armature form a magnetic circuit, and in order to increase the magnetic efficiency of the magnetic circuit, the unique magnetic flux density of the iron core, permanent magnet, and armature must be maximized. It is desirable to utilize them as effectively as possible, and for that purpose, it is desirable that there be no difference in their respective magnetic flux densities. However, the magnetic flux density of the permanent magnet is significantly smaller than that of the iron core and the armature, partly because a working space is formed between the iron core and the armature. Therefore, in the electromagnetic relay, the magnetic flux density of the permanent magnet is increased by increasing the size of the permanent magnet in the direction of the coil winding axis (that is, the longitudinal direction of the iron core), so the number of turns of the coil is small, and the magnetic flux density of the permanent magnet is increased. The problem was that the magnetomotive force of the electromagnetic block was small. (Means for Solving the Problems) The present invention has been made to solve the above-mentioned problems, and consists of an iron core formed by bending both ends of a substantially rectangular plate upward to form opposing magnetic pole pieces. a polarized electromagnetic block in which a permanent magnet is arranged in the part and a coil is wound around the iron core via a spool, and the block is arranged swingably on the permanent magnet;
An electromagnetic relay comprising an armature whose both ends face opposite ends of the iron core with an operating space, and which swings the armature to turn on and off the contacts by switching the current applied to the coil. In this case, the part of the iron core facing the permanent magnet is widened in the width direction to form a widened part, and the permanent magnet and armature are widened correspondingly to the widened part. (Example) Hereinafter, the present invention will be described with reference to the accompanying drawings which are one example. 1 and 2 show an electromagnetic relay according to the present invention, and this electromagnetic relay generally includes a base 1, an electromagnetic block 2, an armature block 3, and a case 4.
It is made up of. Schematic configuration The configuration of each part will be explained below. (i) Base 1 The base 1 is made of insulating synthetic resin, and the base main body 10 is formed with a housing section 11 that is open upward, and grooves 1 are formed in the vertical direction on both outer sides in the long side direction.
0a, 10b, 10b, 10c, and 10c are formed, respectively. The grooves 10b and 10c are distributed symmetrically to the left and right with the groove 10a as the center.
Lead portions of a common terminal 12, a fixed contact terminal 13, and a coil terminal 14 are located at 0b and 10c, respectively. The upper part of each terminal 12, 13, 14 is the base body 1
0, and the tip contact portions 12a, 12a of the common terminal 12 are embedded in the main body 10.
The fixed contact 13 of the fixed contact terminal 13 is exposed on the upper surface of the recess 18 formed approximately in the center in the long side direction.
a are exposed on the upper surface of the base portion 15 formed at the four corners of the housing portion 11, and contact portions 14a of the coil terminal 14 are respectively exposed.
are formed on the inside of the base portion 15 in the short side direction and are exposed at the bottom of a recess 16 that is lower than the base portion 15, and the outside of the base body 10 is provided on the back surface of the coil terminal contact portion 14a. A guide portion 17 for inserting a welding electrode that leads to the welding electrode is formed. Note that the method for molding the base 1 will be described in detail later. (ii) Electromagnetic Block 2 The electromagnetic block 2 is roughly composed of an iron core 20, a spool 23, a coil 27, and a permanent magnet 28. As shown in FIG. 3, the iron core 20 is made of a substantially rectangular plate made of magnetic material with both ends bent upward to form magnetic pole pieces 21a and 21b facing both sides of the iron core body 22.
The upper end of one of the magnetic pole pieces 21a is bent further outward to form a horizontal portion 21c parallel to the core body 22. The permanent magnet 28 has a rectangular shape with magnetic poles formed on the upper and lower sides, and is arranged approximately at the center of the core body 22. The spool 23 is integrally formed with the core 20 so as to cover the core body 22, and has flanges 24, 24 formed at both ends, and a holding portion that also serves as the flanges between them. 29 is formed,
The holding portion 29 integrally holds the permanent magnet 28 with its upper portion exposed, and the holding portion 29
On the upper surface of 9 and on both end sides of the iron core 20, there are iron cores 2
Concave grooves 29a, 29 each having a semicircular cross section in the longitudinal direction of 8.
a is formed. The coil 27 is wound between the flanges 24, 24 and the holding portion 29, and the ends thereof are electrically connected to the coil winding portions 26 of the relay terminals 25 integrally formed with the flanges 21, 21. It is connected. By the way, the spool 23 has an iron core 20 on which a permanent magnet 28 is placed in a mold that is divided into upper and lower halves.
and the relay terminal 25 are housed in a predetermined position, and resin is injected into a mold to form an integral part. At this time, if the resin is injected from below, the permanent magnet 28 will be pressed against the upper mold by the injection pressure, and the gap between the upper surface of the permanent magnet 28 and the groove 29a of the holding part 29 will be closed. can be defined accurately. Note that, although this results in a gap between the lower surface of the permanent magnet 28 and the upper surface of the iron core 22, this gap is only small and does not pose a problem. Further, the upper surfaces of the magnetic pole pieces 21a and 21b are held with a small gap between the upper mold and the armature 30.
is received around the upper surfaces of the magnetic pole pieces 21a and 21b, the armature 30 and the magnetic pole piece 21
The gap between a and 21b during adsorption is maintained at the minute gap. Therefore, a magnetic shield plate is not required. (iii) Armature block 3 The armature block 3 is composed of an armature 30, movable contact pieces 31, 31, and a support portion 36. The armature 30 is a substantially rectangular plate made of magnetic material,
The movable contact piece 31 is provided with a so-called twin structure contact mechanism on both ends, each having a movable contact 32, and its central part extends laterally to form a lead-out part 34, and its tip is connected to the armature 30. The movable contact piece 31 is arranged parallel to both sides of the armature 30 in the long side direction, and is made of synthetic resin. The armature 30 is
is integrated into. However, in the integrated state, the T-shaped connecting portion 33 protrudes from the side of the supporting portion 36. On both sides of the lower surface of the support part 36, corresponding to the grooves 29a, 29a of the electromagnetic block 2, there are protrusions 37, 37 (see FIG. ) is formed, and its height is the same as that between the protrusions 37, 37 and the grooves 29a,
29a, the armature central part 30a
A slight gap is created between the lower surface and the upper surface of the permanent magnet 28. (iv) Case 4 The case 4 is made of synthetic resin and has a box shape that can be attached to the base 1. Assembly The assembly of the electromagnetic relay with the above configuration will be explained. First, in FIG. 2, the electromagnetic block 2 is attached to the accommodating portion 11 of the base 1 formed by a method to be described in detail later. In this state, the relay terminal 25 of the electromagnetic block 2 is located on the coil terminal connecting portion 14a exposed on the bottom surface of the recess 16 of the base 1, as shown in FIG. However, in this embodiment, as shown in FIG. 3, the height h ₁ from the bottom surface of the spool collar 24 to the bottom surface of the relay terminal 25 is equal to the height h 1 from the bottom surface of the accommodating section 11 to the top surface of the coil terminal contact section 14a. Since the height is set slightly higher than _h2 , the relay terminal 25 and the contact portion 14a are separated from each other. Therefore, one electrode of a welding machine (not shown) is inserted upward from the guide part 17 and comes into contact with the lower surface of the coil terminal contact part 14a, and the other electrode is pressed against the upper surface of the relay terminal 25, Relay terminal 25
is pressed against the coil terminal contact portion 14a, and the two are welded and integrated. Therefore, due to the restoring force of the relay terminal 25 itself, the electromagnetic block 2 is firmly fixed while being pressed against the base 1. Note that the relay terminal 25 and contact portion 14a are
When welding them together, the terminal 25 and the contact portion 14a are overlapped with the electromagnetic block 2 mounted on the base 1. Further, the guide section 17 is not necessary. Next, as shown in FIG.
The protruding strip 37 is located in the concave groove 29a of the electromagnet block 2, and the armature block 3 is placed between the concave groove 29 and the protruding strip 37.
It is supported so as to be able to swing in the directions of arrows a and a' using the contact point as a fulcrum. Here, as described above, when molding the spool 23 of the electromagnetic block 2, the distance between the upper surface of the permanent magnet 28 and the groove 29a is accurately defined, so the contact supported by the groove 29a is A minute gap is precisely formed between the lower surface of the pole element 30 and the upper surface of the permanent magnet 28. Both ends of the armature 30 face the upper surfaces of the magnetic pole pieces 21a and 21b of the electromagnetic block 2, and working spaces S and S are formed between them. , iron core 2
0, a magnetic circuit connecting the armature 31 is formed. The T-shaped connecting portion 33 of the movable contact piece 31 has its wing portions 35, 35 connected to the common terminal contact portions 12a, 12, respectively.
The movable contact 32 is located above the fixed contact 13a, and as shown in FIG. Movable contact 32 and fixed contact 13a
contact points 32 and 1 on the left (right side)
3a are separated from each other to form a working space S. Next, the wing parts 35, 3 in the T-shaped connection part 33
5 are welded to the connecting portions 12a, 12a, respectively, to electrically connect the two. In addition, in the T-shaped connection part 33, the derivation part 34
is thin and a semicircular notch 36 (see Figure 1) is formed at the root of the wing 35, so the torsional resistance of the lead-out portion 34 and the bending rigidity of the root of the wing 35 are small. , the swinging motion of the armature block 3 can be performed smoothly. Finally, the case 4 is mounted on the base 1 with the internal components mounted thereon as described above, and the space between the base 1 and the case 4 is filled with resin 5 and sealed. Operation The operation of the electromagnetic relay formed as described above will be explained. In a non-excited state where no current is applied to the coil terminal 14, the magnetic pole pieces 21a and 2 of the iron core 20
1b, the magnetic pole piece 21a has a larger opposing area with the armature 31 and the left and right magnetic balance is disrupted, so the armature 31 moves in the direction of the arrow a and the third
Maintain the state shown in the figure. The left and right coils 27, 2 are connected via the coil terminal 14.
By applying a current to 7 and switching its direction to excite the iron core 20, the armature block 3 forms a concave groove 29a and a convex line 37, as shown in FIG.
The movable contact 32 moves toward and away from the fixed contact 13a by swinging in the direction of the arrow a or a' using the contact point with the movable contact 13a as a fulcrum. Furthermore, even if the concave groove 29a and the convex line 37 come into frictional contact with each other as the armature block 3 swings, the generation of abrasion powder and the like is reduced because both are made of synthetic resin. In addition, the lower surface of the armature central portion 30a and the permanent magnet 2
Since a predetermined cap is held between the upper surface of the holder 8 and the upper surface of the holder 8, there is no possibility that the two will come into contact with each other and impede the swinging operation. Moreover, since the cap is minutely defined, the magnetic efficiency of the permanent magnet 28 is not significantly reduced, and stable operation can be maintained. Method for molding the base and terminals Next, the method for molding the base 1 and the terminals 12, 13, and 14 that are integrally molded thereon will be described in the fifth section.
This will be explained with reference to FIGS. First, the terminals 12, 13, and 14 are integrally formed with a lead frame 50 having the shape shown in FIG. 5 by punching out a conductive plate material constituting these terminals. Here, the terminals 12, 13, 14 are provided symmetrically inside the left and right bases 51, 51, respectively,
The fixed contact terminals 13 and the coil terminals 14 are distributed symmetrically in the vertical direction in the figure with the common terminal 12 as the center. In addition, fixed contact terminals 13, 13 located above and below
The tip of the coil terminal 14 is integrally connected to the coil terminal 14 without providing a blank between the terminals 14 and 14,
Coil terminal contact parts 14a, 14a located above and below
The distance between the upper and lower fixed contacts 13a, 13a is made as large as possible. Therefore, the distance between the movable contacts of the movable contact piece 31 can be increased, in other words, the length of the movable contact piece 31 can be increased, and the electromagnetic relay can obtain stable operating characteristics with small variations. be able to. Furthermore, it becomes possible to increase the distance between the spool flanges 24, 24, and it also becomes possible to increase the number of turns of the coils 27, 27 wound around the electromagnetic block 2 to obtain a larger magnetomotive force. Next, the lead frame 50 is transferred to a pressing process, where the contact terminal 13 and the coil terminal 14 are cut along the cut line 53 to separate them, and as shown in FIG. For the common terminal ₁₂ , fold it downward from _the plane of the paper at _the dotted line part , and further bend it parallel to the lead frame 50 at the dotted line Y ₂ to form the contact portions 12a, 12.
A is formed and processed into the shape shown in FIGS. 7 and 8.
As a result, the coil terminal 14 is connected to the fixed contact terminal 13.
It is set at a lower position than the previous one, so there is no chance that the two will intersect. Next, the lead frame 50 processed as described above is transferred to the next base molding process, and is fixed in a mold divided into upper and lower halves, and resin is injected into this mold to mold the base 1. . As a result, the tips of the terminals 12, 13, and 14 are integrally embedded in the base 1, as shown in FIG. The parts 12a, 13a, 14a are each
It is exposed at the recess 18 , the top surface of the platform 15 , and the bottom surface of the recess 16 . In this way, the tips of the terminals 12, 13, and 14 do not protrude significantly from the surface of the base 1, but merely expose the contacts or contact portions 12a, 13a, and 14a, so that when the upper and lower molds are assembled, There is no risk that the tips of the terminals 12, 13, 14 will come into contact with the mold and be bent. Therefore, it is possible to reduce processing costs by simplifying the structure of the mold, and it is also possible to increase production efficiency by increasing the assembly speed of the molds. Next, the common terminal 12 and the contact terminal 14 are cut at the connection part with the lead frame 50 as shown in FIG.
It is accommodated in 0c. However, the fixed contact terminal 1 is still
3 is connected to the lead frame 50, and it is moved to the next assembly process in this state, after the electromagnet block 2 and armature block 3 of the base 1 are installed as described above, and before the case 4 is installed. It is separated from the lead frame 50, bent downward at the root portion protruding from the base 1, and processed into the state shown in FIG. That is, the base 1 is transported through each assembly process while being held by the lead frame 50 as a carrier. Therefore, compared to the method in which all the terminals 12, 13, and 14 are separated from the lead frame 50 and transported through each assembly process in the state shown in FIG. 1, there are the following advantages. That is, it is not necessary to carry the base 1 on a platen, and the platen becomes unnecessary. Also, when transporting it on a platen,
During the conveyance process, this collides with the stopper and base 1
The base 1 is positioned and then the assembly work is performed, but the backlash that occurs when it collides with the stopper disturbs the position of the base 1, which may reduce the assembly accuracy. On the other hand, in the above method, since the lead frame 50 is used as a carrier, not only the lead frame 50 but also the base 1
can be positioned accurately, significantly improving assembly accuracy and improving quality. Furthermore, when performing a characteristic check during assembly,
The bottom surface of the base 1 has a common terminal 12 and a coil terminal 1.
4 protrudes, and the fixed contact terminals 13 are lined up between these terminals 12 and 14 and do not protrude.
Contacts for checking characteristics, etc. can be easily connected to the terminals 12 and 14, and adjustment can be performed in-line. Note that each fixed contact terminal 13 is in a conductive state via the lead frame 50, but there is no problem even in this state because the characteristics necessary for adjusting the relay can be measured. V Shape of iron core, etc. Next, iron core 20, permanent magnet 28, and armature 3
The shape of 0 will be explained with reference to FIG. The main body 22 of the iron core 20 has widened parts 22a, 22a by partially widening both sides of its substantially central part laterally, and similarly, the armature 30 has widened parts 22a, 22a on both sides of its substantially central part 30a. and widened portions 22a, 22
The distance ₁ between the end faces of a is set to be slightly less than twice the width ₂ of the core body 22, the same as the longitudinal width ₃ of the permanent magnet 28, and the same as the width ₄ of the armature central portion 30a. , the width b ₁ of the widened portion 22 a is the same as the width b ₂ of the permanent magnet 28 . By forming the above shape, the permanent magnet 28
is the core widened portion 22a, 22 which has almost the same width as this.
Since the end surfaces of a and the armature 30 are aligned, the iron core 20, the permanent magnet 28, and the armature 3
The magnetic efficiency of the magnetic circuit formed with zero can be improved. Furthermore, by reducing the main body width _b2 of the permanent magnet 28, the number of turns of the coil 27 wound around the main body 22 and the magnetomotive force of the electromagnetic block 2 can be increased accordingly, and the thickness of the permanent magnet 28 can be reduced. By making it smaller, the bulk of the electromagnetic block 2 can be reduced, and the electromagnetic relay can be made more compact. In addition, when the permanent magnet 28 is integrally molded on the holding portion 29 of the spool 23 as in the above embodiment,
The permanent magnets 28 may be installed in the widened portions 22a, 22a with their end faces aligned, and the permanent magnets 28 can be molded in a state where they are precisely positioned with respect to the iron core 20. Countermeasures against resin inflow When the case 4 is attached to the base 1 and the outer periphery of the base 1 is filled with resin 5, the filled resin 5 flows into the grooves 10a, 10b, and 10c on the outside of the case 1, especially when As in the embodiment, when the T-shaped connecting portion 33 of the armature block 3 is located on the recess 18 formed on the upper surface of the outer wall of the case, the resin 5 enters between the lead-out portion 34 and the base 1 due to capillary action. If it solidifies between the two, the swinging of the armature block 3 will be inhibited and the desired characteristics will not be obtained. Therefore, in this embodiment, as shown in FIGS. 13, 14, and 15, the tip of the common terminal 12 is formed into a T-shape, which is bent upward, and then bent horizontally. Contact part 12a, 1
2a, and by embedding the base 12b between the contact portions 12a, 12a in the case 1, a partition wall 18a is formed thereon, and a space S ₀ located between the lead-out portion 34 and the case 1 is formed inside the partition wall 18a. is formed. Therefore, the resin 5 flowing through the groove 10a is first blocked by the partition wall 18a, and the amount of resin 5 flowing into the partition wall 18a is extremely small. In addition, the resin 5 trying to flow over the partition wall 18a
The capillarity is impaired due to the void S ₀ and the partition wall 18a
The case 1 and the lead-out part 34 are not solidified in an integrated state between the case 1 and the lead-out part 34. For this reason, the T-shaped connecting portion 3 of the movable connecting piece 31
The attractive force of the electromagnetic block 2 is increased by increasing the distance between the tips of the magnets 3 and 33 to a width equivalent to the width of the base 1, and increasing the width of the armature 30, the permanent magnet 28 facing it, and the iron core magnetic pole pieces 21a and 21b in the short side direction. It can be made larger. Shape of the magnetic pole piece Next, as shown in FIG. 12, the magnetic pole piece 21a having the horizontal part 21c is in a dotted line state when simply bent, and the area of the flat part of the upper surface is very small, and there is no contact with the armature 30. The magnetic efficiency between the two is poor. Therefore, in this embodiment, after applying a force to the magnetic pole piece 21a from the direction of the arrow β to reduce the curvature of the R portion 21d, the upper part of the horizontal portion 21c is struck from the α direction to increase the flat area of the upper surface. be. Therefore, the end face of the magnetic pole piece 21a can be moved further inward (in the direction of arrow b), the length in the long side direction of the iron core 20 can be reduced, and the electromagnetic relay can be made more compact. By increasing the area facing 30, leakage of magnetic flux can be prevented and magnetic efficiency can be improved. In addition, magnetic pole piece 2
The upper surface of 1a may be flattened by shaving and cutting. In the above embodiment, the horizontal portion 21c was formed only on the magnetic pole piece 21a, but in the case of a latching type, the left and right magnetic pole pieces 21a, 2
1b may have the same shape. Other Embodiments In the embodiment described above, the armature block 3 is attached to the holding part 2.
9, but it may be supported by permanent magnets 28. (Effects of the Invention) As is clear from the above description, the present invention has a permanent magnet arranged approximately at the center of an iron core formed by bending both ends of a substantially rectangular plate upward to form opposing magnetic pole pieces. , a polarized electromagnetic block in which a coil is wound around the iron core via a spool, and an armature that is swingably disposed on the permanent magnet and has both ends opposed to both ends of the iron core with a working space. In the electromagnetic relay that swings the armature to turn on and off the contacts by switching the current applied to the coil, the part of the iron core facing the permanent magnet is widened in the width direction. The width of the permanent magnet and the armature are widened to correspond to the widened portion. That is, the permanent magnet and the armature are disposed with their end surfaces aligned in the widened portion of the core body. Therefore, by increasing the magnetic flux density of the permanent magnet,
The magnetic efficiency of the magnetic circuit formed by the iron core, permanent magnet, and armature can be increased. In addition, by reducing the width of the permanent magnet body, the number of turns of the coil wound around the body and the magnetomotive force of the electromagnetic block can be increased accordingly.
By reducing the vertical thickness of the permanent magnet, the bulk of the electromagnetic block can be reduced, and the electromagnetic relay can be made more compact. Furthermore, when the permanent magnet is integrally molded onto the spool, the permanent magnet may be installed with its end surfaces aligned with the widened portion, and the permanent magnet can be molded while being precisely positioned with respect to the iron core.

[Brief explanation of drawings]

1 to 4 show an electromagnetic relay according to the present invention, FIG. 1 is a plan view, FIG. 2 is an exploded perspective view,
Figure 3 is a sectional view taken along the - line in Figure 1, and Figure 4 is a cross-sectional view of Figure 1.
5 and 6 are plan views of the lead frame, FIG. 7 is a sectional view taken along the - line in FIG. 6, FIG. 8 is a sectional view taken along the - line in FIG. 6, and FIG. ，
Figure 10 is a perspective view showing the molding process of the base.
Figure 1 is a perspective view of the main part of Figure 1, Figure 12 is a side view of the magnetic pole piece, Figure 13 is a partially enlarged plan view of the electromagnetic relay, and Figures 14 and 15 are partially enlarged sectional views of the electromagnetic relay. be. 1...Base, 10...Base body, 11...
Accommodating part, 12... common terminal, 12a... contact part,
13...Fixed contact terminal, 13a...Fixed contact, 1
4...Coil terminal, 14a...Contact part, 15...
Base part, 16... recess, 17... guide groove, 18...
Recessed portion, 2...Electromagnetic block, 20...Iron core, 2
1a, 21b...Magnetic pole piece, 22...Iron core body, 2
3... Spool, 24... Flange, 25... Relay terminal, 26... Coil winding part, 27... Coil, 2
8... Permanent magnet, 29... Holding part, 29a... Concave groove, 3... Armature block, 30... Armature, 3
1...Movable contact piece, 32...Fixed contact, 33...
Connection part, 34... Derivation part, 35... Wing part, 36...
...Support part, 37...Protrusion, 4...Case, 5...
Resin, 50...Lead frame, 51...Base,
53...Cut line.

Claims (1)

[Claims] 1. A polarized electromagnetic block in which a permanent magnet is arranged approximately in the center of an iron core with both ends of a substantially rectangular plate bent upward to form opposing magnetic pole pieces, and a coil is wound around the iron core via a spool. and an armature that is swingably disposed on the permanent magnet and has both ends opposed to both ends of the iron core with a working space, and the armature is arranged so as to be able to swing freely on the permanent magnet. In electromagnetic relays that turn the contacts on and off by swinging the poles,
The part of the iron core facing the permanent magnet is widened in the width direction to form a widened part, and corresponding to the widened part,
An electromagnetic relay characterized in that the permanent magnet and the armature are widened.