JPH04363830A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To provide an electromagnetic relay having simple constitution and permitting easy assembly, while having stable electromagnetic characteristics and compact design. CONSTITUTION:A yoke body is constituted of the roughly J-shaped first yoke 2, and the roughly L-shaped second yoke 3. The first yoke 2 has a projection 2c for press fitting, while the second yoke 3 has a hole 3c for press fitting. Both yokes 2 and 3 are pressed and coupled to each other via the projection and hole 2c and 3c, thereby forming a horse shoe type yoke body. According to this construction, an armature 4 is attracted at the time of power supply to a coil bobbin 1 to perform desired selective operation.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small electromagnetic relay having approximately the same size and shape as an IC.

0002

[Prior Art] Conventional electromagnetic relays of this type have an armature housed in a through hole of a coil bobbin in order to reduce the size of the relay.
There is an electromagnetic relay disclosed in the above publication. An exploded side view of the driving portion of this electromagnetic relay is shown in FIG. 8(a).

The coil bobbin 30 on which the coil is wound is provided with a through hole and a guide groove, and substantially U-shaped yokes 31 and 32 are press-fitted into the guide grooves from opposite directions, respectively. After the yokes 31 and 32 are press-fitted, the armature 36 to which the hinge spring 33 is fixed in advance to one end is inserted into the through hole, and the other end of the hinge spring 33 is fixed to the yoke 31. Thereafter, as shown in FIG. 8(b), it is combined with the contact block to complete the assembly. In the assembled state, the assembled body of the yokes 31 and 32 forms a horseshoe shape, and the armature 36 is attracted to the magnetic gap 35 by energizing the coil wound around the coil bobbin 30, and the contact block 40 allows various A switching operation can be performed.

0004

[Problem to be Solved by the Invention] However, the strength of the magnetism in the magnetic gap 35, which is one of the factors that influences the operation of the armature that determines the performance of such an electromagnetic relay, is Strict dimensional accuracy is required because it is inversely proportional to the power. However, since it is located within the guide groove 30a of the coil bobbin and cannot be seen from the outside, it cannot be adjusted visually. Moreover, since the yoke 31 and the magnetic pole piece 32, that is, the two yokes constituting the magnetic circuit, are overlapped on the outside of the coil bobbin 30 by press fitting and are fixed to the coil bobbin 30, as shown in FIG.
As shown, the relative positional relationship between the yoke 31 and the magnetic pole piece 32 depends on how horizontal forces H1 and H2 are applied during press-fitting, and is extremely unstable.

Moreover, another factor that increases the magnetic resistance is the overlapping portion A between the yoke 31 and the magnetic pole piece 32. The front surfaces of this overlapping portion A are not in close contact with each other in a plan view. In the first place, there are manufacturing variations in each yoke itself and manufacturing variations in the coil bobbin made of molded material, and because these different materials with manufacturing variations are press-fitted together while sliding, it is not a surface contact but a line contact state. Or it becomes a point contact state. Therefore, the magnetic resistance increases also in this overlapped portion A, and the electromagnetic force of the entire magnetic circuit decreases, which hinders the increase in the operating speed of the electromagnetic relay.

Furthermore, since the two yokes are fixed to the coil bobbin only by press-fitting, if the armature is operated more than tens of thousands of times, there is a risk that a positional shift will occur between the two yokes, resulting in malfunction.

For this reason, this electromagnetic relay is shown in FIG.
As shown in the dashed lines inside, yokes 31 and 32 before assembly.
It is also possible to apply a pressing force to the contact surface between the yokes by applying special bending process to the yokes, but there is a limit to the pressing force that can be applied to the coil bobbin, which is made of a molded material that is weaker in strength than metal materials. Yes, it does not go from a line contact state to a surface contact state. Furthermore, bending or processing the yoke or coil bobbin with high dimensional accuracy significantly increases the cost of parts and is not economical.

In order to increase the press-fitting strength of the coil bobbin, it is conceivable to increase the wall thickness by making the bobbin larger, or to increase the wall thickness by reducing the width and height of the guide groove 30a.
Increasing the size of the coil bobbin goes against the purpose of miniaturization, and reducing the width and height of the guide groove means that the yoke to be press-fitted becomes smaller, increasing magnetic resistance.
Both have their limits and are incompatible.

For this reason, it is conceivable to use an elastic band or perform special post-processing such as welding on the overlapped portion A, but this method increases the number of steps and also requires the press-fitting of a yoke with a coil wound thereon. Performing such processing after the process has been performed increases the risk of component damage and reduces yield. Furthermore, if the two yokes 31 and 32 are not properly fitted, the relative positional relationship between the yokes and the contact block will shift in the direction of the arrow in FIG. 8(b).
There was also the risk of touching the card 38 and causing contact malfunction.

Furthermore, the yokes 31 and 32 become larger by the total thickness at the joint A, which is contrary to the purpose of miniaturization. For example, if the overlap part A of yokes 31 and 32
It is also possible to reduce the thickness by cutting or crushing the material, but there is a restriction that the thickness cannot be reduced below that required for the bending process, and a predetermined thickness is required, and the thinned part cannot be made thinner. Magnetic resistance increases. At this time, there is no problem if the overlapping portion A is in perfect surface contact, but if force is applied after the coil is inserted into the bobbin wound, the coil etc. will be damaged, so it is impossible to press the coil, etc. Similar points arise, and new problems arise, such as having to come into contact with each other.

In any case, the dimension L0 after assembly due to the relative positional relationship between the yoke 31, the magnetic pole piece 32, and the coil bobbin 30 depends on the dimensional accuracy of the coil bobbin 30 made of molding material and the horizontal force H1 during press-fitting. , the point determined by the way H2 is applied, the yoke 31 and the magnetic pole piece 32
There is a fundamental problem in that a force V in the lateral direction is applied to the coil bobbin when or after the coil bobbin is inserted, and the magnetic resistance is influenced by this force.

Next, FIG. 9(a) shows the
FIG. 4 is a front view of the electromagnetic relay disclosed in Publication No. 4. As shown in the exploded front view of the electromagnet part in FIG. 9(b), this electromagnetic relay 41 has a substantially U-shaped yoke 42 in a guide groove 41a, and pieces 42a and 43a of a magnetic pole piece 43, as in the conventional example.
is press-fitted and fixed. The guide groove 41a is shown in FIG.
As shown in the side view of the coil bobbin in c), a through hole 44a passing through the coil bobbin 44 is partially enlarged in diameter to about the width of the pieces 42a and 43a of the yoke 42 and the magnetic pole piece 43. Further, in order to bring the yoke 42 covering the outside of the coil bobbin 44 into closer contact with the end face of the magnetic pole piece 43, the yoke 42 side is bent in advance at a slightly acute angle as shown by the dotted line in the figure. Therefore, during assembly, both the yoke 42 and the magnetic pole pieces 43 are arranged with respect to the pieces 42a and 43a inserted into the guide groove 41a.
The free end portion of No. 2 obtains a restoring force on the coil side and presses against the end face of the magnetic pole piece 43 to form a horseshoe-shaped magnetic circuit.

However, in this electromagnetic relay 41, the free end of the yoke 42 receives a restoring force on the coil side and is pressed against the end face of the magnetic pole piece 43.As in the conventional example, the free end of the yoke 42 and the magnetic pole piece 43 The state of contact between the guide groove 41a and the pieces 42a, 43a varies greatly depending on the machining accuracy of the guide groove 41a and the pieces 42a, 43a, and the dimensional tolerance between the guide groove 41a and the pieces 42a, 43a, and it is difficult to obtain stable contact. It may not be possible. In this case, the contact portion between the free end of the yoke 42 and the end face of the magnetic pole piece 43 had to be specially treated by welding, scissoring, etc.

[0014] Also, with respect to the guide groove 41a, pieces 42a,
Since both 43a are press-fitted, a large force is required during assembly, and a large force is applied to the coil bobbin 44, which may cause damage to the coil bobbin 44. Furthermore, since the contact state between the free end of the yoke 42 and the end face of the magnetic pole piece 43 can be confirmed for the first time after assembly, even if a defect is discovered after press-fitting, it cannot be disassembled again, and the contact state can be corrected. If a force is applied to the guide groove 41a, this force will be applied directly to the guide groove 41a, and there is a possibility that the guide groove 41a will be damaged as well.

The first object of the present invention is to solve the above-described drawbacks of the conventional electromagnetic relay, and to provide a compact electromagnetic relay similar to an IC that is highly accurate and easy to manufacture. A second object of the present invention is to provide an electromagnetic relay that does not apply excessive pressure to the coil bobbin when assembling the electromagnetic relay that achieves the above object, and that can be easily assembled.

[0016]

[Means for Solving the Problems] In order to achieve the above object, the electromagnetic relay of the present invention includes a coil bobbin in which a through hole is formed, one end side of each of the coil bobbins overlaps on the outside of the coil bobbin, and each of the coil bobbins has a coil bobbin formed with a through hole. two yokes inserted into the through-hole of the coil bobbin so that their other ends face each other with a gap in between; and at least a portion of the yokes are located within the through-hole and form a magnetic circuit together with the two yokes. In the electromagnetic relay comprising an armature 4 movably provided so as to form a contact block 10 having a contact body 10d driven by the armature 4, in the electromagnetic relay according to claim 1, the two yokes include: The first yoke 2 has a substantially J-shaped cross section and is provided with a press-fit protrusion 2c with a step 2e on one end side of a portion protruding outside the width of the coil bobbin 1; A second yoke 3 is provided with a press-fit hole 3c into which a press-fit protrusion 2c of the first yoke 2 is press-fitted in the outer part of the coil bobbin 1, and one end of the first yoke 2 and the second yoke 3 It is characterized in that it is fixed by press-fitting the press-fit protrusion 2c into the press-fit hole 3c on the side.

Further, in the second aspect of the present invention, a penetrating insertion hole 1ca is formed in the center of the coil bobbin 1, and the two yokes 2
, 3 has a substantially J-shaped cross section, and is provided with a press-fit protrusion 2c with a step 2e on one end side of the part that protrudes outside the coil bobbin 1 from the width of the part inserted into the insertion hole 1ca. In addition, the first yoke 2 has engagement grooves 2d, 2d formed at a substantially central position of the bent base piece 2a, and the first yoke 2 has a substantially L-shaped cross section and a portion protruding outside the coil bobbin 1. A second yoke 3 is provided with a press-fit hole 3c into which a press-fit protrusion of the first yoke 2 is press-fitted. A recess with a width approximately equal to the width of the portion of the first yoke 2 is formed, and an engaging projection 10g that engages with the engaging groove 2d of the first yoke 2 is formed on both sides 10f, 10f of the recess.
10g, and the first yoke 2 and the contact block 10 are positioned in the horizontal direction by engagement between the engagement groove 2d and the engagement protrusion 10g.

Furthermore, in claim 3, the first coil bobbin 15 has a substantially J-shaped cross section and is provided with a press-fit protrusion 20c with a step 20e on one end side of a portion protruding outside the width of the coil bobbin 15.
a yoke 20 and a coil bobbin 15 having a substantially L-shaped cross section;
A press-fitting protrusion 20 of the first yoke 20 is attached to the outside part of the first yoke 20.
The second yoke 23 is provided with a press-fit hole 23c into which the coil bobbin 15 is press-fitted, and the through-hole of the coil bobbin 15 is
a hole 15c into which the bent piece 23b of the yoke 23 is loosely fitted;
Width L3 and thickness L of the bent piece 20b of the first yoke 20
The first yoke 20 is press-fitted into the insertion hole 15ca, and the first yoke 20 is press-fitted into the insertion hole 15ca. 23 is located in the hole 15c,
It is characterized in that the first yoke 20 and the second yoke 23 are fixed by press-fitting a press-fit protrusion 20c into a press-fit hole 23c at one end side.

[0019]

[Operation] In the first embodiment, the first yoke 2 has a substantially J-shaped cross section.
The bent pieces 2b and 3b at the other end of the second yoke 3, which has a substantially L-shaped cross section, are inserted into the insertion hole 1ca of the coil bobbin 1 from opposing directions.

After insertion, the press-fit protrusion 2c of the first yoke 2 is press-fitted into the press-fit hole 3c of the second yoke 3 and fixed, so that the two are completely connected mechanically and magnetically.
There is no increase or decrease in magnetic resistance at the press-fitting point, and the magnetic gap formed by both is set regardless of the force at the time of press-fitting, and a stable C-shaped magnetic circuit is formed.

In the second embodiment, the bent piece 20b of the first yoke 20 is press-fitted into the insertion hole 15ca of the coil bobbin 15. The second yoke 23 is loosely fitted into the hole 15c. After insertion, the press-fit protrusion 20c of the first yoke 20 is press-fitted into the press-fit hole 23c of the second yoke 23 and fixed, thereby mechanically and magnetically joining and forming a magnetic circuit. Further, no overpressure is applied to the coil bobbin 15 during press fitting.

The yoke assembly including the first yoke and the second yoke moves the armature 4 by energizing the coils wound around the coil bobbins 1 and 15, and causes the leaf spring 5 to return the armature 4 in a non-energized state. , a desired switching operation is performed by this movement of the armature 4.

[0023]

Embodiment FIG. 1 is an exploded perspective view showing a first embodiment of the electromagnetic relay of the present invention, FIGS. 2(a) and 2(b) are a side view and a plan view of the first yoke, and FIG. and (d) are a side view and a rear view of the second yoke.

The coil bobbin 1 is provided with terminals 1a and 1b connected to the windings, and is supplied with power for operation. This coil bobbin 1 has a hole 1c formed therethrough, and an armature 4, which will be described later, is movably arranged in the hole 1c in an assembled state. Furthermore, this hole 1
A somewhat large diameter insertion hole 1ca is opened in c. Further, on the opposite side of the terminals 1a, 1b, engaging pieces 1d, 1
d is formed protrudingly.

The first yoke 2 is bent into a substantially J-shape and has a base portion 2a and a bent portion 2b, and the bent portion 2b is inserted into the insertion hole 1ca of the coil bobbin 1. Then, on one end side of the base piece part 2b, a press-fit protrusion 2c having a step 2e and a tapered tip is formed protrudingly in a part protruding outside the coil bobbin 1 from the width of the part to be inserted into the insertion hole. , an engagement groove 2 for positioning is provided at approximately the center position.
d, 2d are formed.

The second yoke 3 is formed into a substantially L-shape and has a base portion 3a and a bent portion 3b. The bent portion 3b is inserted into the insertion hole 1ca of the coil bobbin 1. These bent portions 2b, 3 of each yoke inserted into the insertion hole 1ca
The end faces of b face each other with a predetermined magnetic gap D between them. A press-fit hole 3c into which a press-fit protrusion of the first yoke is press-fitted is formed in the base piece 3a at a portion that protrudes to the outside of the coil bobbin.

The base piece 3a of this approximately L-shaped second yoke 3
The base end 5a of the leaf spring 5 is fixed to the base end 5a of the leaf spring 5, and the other end 5b of the leaf spring 5 is fixed to the base end 4a of the armature 4, so that the leaf spring 5 acts as a return means for the armature 4. . Further, the free end portion 4b of the armature 4 is engaged and fixed to the engaging portion 6a of the card 6.

Next, the base 1 constituting the contact block 10
0a is formed with a recess having a width approximately equal to the width of the portion of the first yoke 2 that protrudes outside the coil bobbin, and through holes 10b and 10b are formed at the end positions corresponding to the coil terminals 1a and 1b, respectively.
10b is provided, and engagement holes 10c, 10c are provided corresponding to the engagement pieces 1d, 1d.

Engagement pieces 10g, 10g are provided on both sides 10f, 10f of the recess of the base 10a corresponding to the width of the first yoke 2, corresponding to the engagement grooves 2d, 2d of the first yoke 2, respectively.
is provided.

Further, in this contact block 10, a contact body 10d for various switching is provided at the position of the operating piece 6b at the lower end of the card 6, and the switching state of the contact body 10d is taken out to the outside via a terminal 10e. It is.

Next, the assembly of the electromagnetic relay having the above structure will be explained. First, the bent portions 2b and 3b of the first yoke 2 and the second yoke 3 are inserted from opposing positions of the insertion hole 1ca of the coil bobbin 1 in the directions shown by arrows B and C in FIG. 1, respectively, and assembled. At this time, arrow B in Figure 2
, C is applied to the press-fit hole 3c of the second yoke 3.
The press-fit protrusion 2c of the first yoke 2 is press-fitted into. As shown in FIG. 3, the relative positional relationship between the first yoke 2 and the second yoke 3 with respect to the coil bobbin 1 is such that the horizontal dimension L1 is defined by the position of the step 2e of the first yoke, and the vertical dimension L2 is defined by the position of the press-fit hole 3c of the second yoke 3, and since these can be assembled with dimensional accuracy during each molding, there is no overpressure against the side of the coil bobbin 1.

As a result, the first and second yokes 20 and 23 form a yoke assembly consisting of a C-shaped magnetic circuit. At the press-fit fixing location, the metal materials are completely mechanically and magnetically joined to each other, so there is no increase in magnetic resistance at the press-fit location.

[0033] Also, the horizontal dimension L1 of the yoke assembly
is positioned at a dimension defined by the stepped portion 2e of the first yoke 2, and vertically positioned at a dimension defined by the position of the press-fit hole 3c of the second yoke 3. Therefore,
Even when manufacturing variations are considered, the magnetic gap D is accurately set to a predetermined dimension. Furthermore, while using a coil bobbin, which is a conventional molded member, the yoke assembly can be assembled with sufficiently high precision in both horizontal and vertical dimensions.

The components such as the yoke assembly, the armature 4, and the card 6 are assembled to the coil bobbin 1 as shown in FIG.
After the electromagnet shown in is created, the contact block 10 is integrated into this electromagnet. That is, the terminals 1a and 1b of the coil bobbin 1 are inserted into the through holes 10b and 10b of the contact block 10 in the direction of the arrow in FIG.
, 1d into the engagement holes 10c, 10c, the coil bobbin 1 and the yoke assembly are positioned on the contact block 10.

Furthermore, the first yoke 2 has both side portions 10
f, 10f, and the engagement grooves 2d, 2d engage with the engagement pieces 10g, 10g of the contact block 10.
The relative positional relationship between the yoke assembly and the contact block 10 can also be accurately determined. With the above assembly, Figure 1
An electromagnetic relay with the shape shown below is assembled.

003
6] By supplying power to the terminals 1a and 1b of the assembled electromagnetic relay, the first yoke 2 and the second yoke 3
In the gap between them, the armature 4 is attracted toward the yoke assembly, and the actuating piece 6b of the card 6 moves toward the contact body 10d to switch and operate the contact body 10d, thereby closing the terminal 10.
Perform the electrical switching operation of e.

When the power supply to the terminals 1a, 1b is cut off, the armature 4 is returned to its original state by the leaf spring 5, and the operating piece 6b of the card 6 is thereby separated from the contact body 10d and returned to its initial state.

Next, a second embodiment of the electromagnetic relay of the present invention will be described. Hereinafter, in this embodiment, the changed parts of the electromagnet will be explained, and the explanation of the same parts as in the previous embodiment will be omitted. FIG. 5 shows a coil bobbin according to the second embodiment, in which (a) is a side sectional view of the coil bobbin, (b) is a view taken along line B-B in (a), and (c) is a side sectional view of the coil bobbin. teeth,(
It is a CC arrow view of a).

A hole 15c is formed through the coil bobbin 15, and the armature 4 is movably disposed in the hole 15c in an assembled state. As shown in FIG. 5(c), the holes 15c are formed in such a manner that the upper edge of the quadrangular side has an inclined opening so that the upper edge 15cb has a width L5 and the lower edge 15cc has a width L3 (L3>L5). It is what was done. The inclined piece part 15cd is formed on the upper part of the side piece part 15ce that is formed upright at a right angle to the lower edge part 15cc, and is connected to the upper edge part 15cb. Furthermore, this hole 15c
As shown in FIG. 5(b), an insertion hole 15ca having a slightly large diameter is opened from one end of the coil bobbin 15 to a substantially central position. This insertion hole 15ca is formed to have a width L3 and a thickness L3' approximately equal to the bending portion 20b of the first yoke 20, which will be described later. In addition, the insertion hole 15
The thickness L3' of ca is shorter than the length L6 of the inclined piece portion 15cd formed in the hole 15c (L3'<L6).

A first yoke 20 and a second yoke 23 shown in FIG. 6 are inserted into the coil bobbin 15, respectively. 1st
The yoke 20 has a base portion 20a and a bent portion 20b, which are bent into a substantially J-shape with a width L3 and a thickness L3'. On one end side of the base piece 20a, a press-fit protrusion 20c having a step 20e on the outside of the coil bobbin 15 and a tapered tip is formed protrudingly, and a press-fit protrusion 20c with a tapered tip is formed on the one end side of the base piece 20a. Engagement piece 10g, 10
Engagement grooves 20d, 20d for positioning at positions corresponding to g
is formed.

The second yoke 23 is formed into a substantially L-shape with a width L4 and a thickness L4', and has a base portion 23a and a bent portion 23b. The bent portion 23b is formed by the hole 15 of the coil bobbin 15.
inserted into c. A coil bobbin 15 is attached to the base piece 23a.
A press-fitting hole 23c into which the press-fitting protrusion 20c of the first yoke is press-fitted is formed in the outwardly extending portion of the yoke.

Next, the assembly of the electromagnet having the above structure will be explained. FIG. 7 shows the assembled state of the electromagnet, with the first yoke 20 and the second yoke 23
Unlike the first embodiment, it is assembled upside down. Assembling begins with the bent portion 20b of the first yoke 20.
is inserted through the insertion hole 15ca at one end of the coil bobbin 15. In this state, the base piece 20a is attached to the coil bobbin 1.
5, and the press-fit protrusion 20c
is located at the upper part of the other end of the coil bobbin 15. Next, the bent portion 23b of the second yoke 23 is attached to the coil bobbin 15.
It is inserted into the hole 15c on the other end side. When inserting this,
The second yoke is loosely fitted into the hole 15c,
No force is applied to the hole 15c. After that, the press-fit protrusion 20c of the first yoke 20 is inserted into the press-fit hole 23c of the second yoke 23.
Press in. During this assembly, after the bent portion 20b of the first yoke 20 is positioned by press-fitting into the insertion hole 15ca, the bent portion 23b of the second yoke 23 can be freely inserted into the hole 15c, and the bent portion 23b of the second yoke 23 can be freely inserted into the hole 15c. No overpressure is applied to the hole 15c.

After assembly, the first and second yokes 20, 23
A yoke assembly consisting of a C-shaped magnetic circuit is thus formed. At the press-fit fixing location, the metal materials are completely mechanically and electrically connected to each other, so there is no increase in magnetic resistance at the press-fit location. The yoke assembly also includes a first
Since the yoke 20 is positioned and fixed in the insertion hole 15ca, the second yoke 23 also has the same position as the first yoke 2.
Since they are connected at the press-fit holes 20c and 23c, which are the joint parts between the two parts, they can be positioned in the same way.

[0044] Then, the horizontal dimension L of the yoke assembly
7 is positioned in a dimension defined by the stepped portion 20e of the first yoke 20, and vertically aligns with the press-fit hole 2 of the second yoke 23.
3c, and the magnetic gap D is accurately set to a predetermined dimension. In addition, while using a coil bobbin, which is a conventional molded member,
The yoke assembly can be assembled with sufficient precision in both horizontal and vertical dimensions. This prevents excessive pressure from being applied to the side of the coil bobbin 1 during assembly.

After this, as in the previous embodiment, the coil bobbin 1
5, components such as the yoke assembly, the armature 4, and the card 6 are assembled to create an electromagnet, and the contact block 10 is integrated with this electromagnet to create an electromagnetic relay.

[0046]

As described above, according to the present invention, a step is provided in the first yoke having a substantially J-shaped cross section to provide a press-fit protrusion, and a press-fit hole is provided in the second yoke having a substantially L-shaped cross section. Provided,
The yoke assembly can be fixed to the coil bobbin by press-fitting the press-fit protrusion of the first yoke into the press-fit hole of the second yoke while inserting both into the coil bobbin, which not only improves the dimensional accuracy of the yoke assembly but also ensures the accuracy of the electromagnet. The relative positioning accuracy of the yoke assembly and coil bobbin is significantly improved compared to conventional products, and no error occurs due to the pressure applied when the yoke is press-fitted.

Furthermore, a recess with a width approximately equal to the width of the portion of the first yoke protruding outside the coil bobbin is formed in the base of the contact block, and the engaging groove of the first yoke is formed on both sides of the recess. If the structure is provided with an engaging protrusion that engages with the electromagnet, the electromagnet and the contact block can be assembled with high horizontal dimensional accuracy.

Furthermore, the through hole portion of the coil bobbin is
Since the structure includes an insertion hole into which the yoke is press-fitted and a hole into which the second yoke is loosely fitted, assembly of the electromagnet can be facilitated, and this assembly can be performed without damaging the coil bobbin.

In addition, the dimensional accuracy required for each part is lower than that of conventional products, it is easy to assemble, there is no need to apply excessive force to the coil bobbin, and there is little manufacturing variation, making it economically possible to mass produce. It is.

Furthermore, there is no fear that the positional relationship of the yoke assembly, armature, and contact block will change due to high-speed operation or aging, so it is durable and reliable despite being small and about the same size as the IC. It is possible to obtain a high electromagnetic relay.

[Brief explanation of the drawing]

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

[Fig. 2] (a) and (b) are the first electromagnetic relay of Fig. 1.
A side view and a top view of a yoke, (c) and (d) a side view and a rear view showing a second yoke.

FIG. 3 is a schematic cross-sectional view showing how the electromagnet of the electromagnetic relay shown in FIG. 1 is assembled into a contact assembly block.

FIG. 4 is a schematic cross-sectional view of the electromagnetic relay of the first embodiment after the electromagnet is assembled.

5(a) is a side cross-sectional view showing a coil bobbin according to a second embodiment of the present invention; FIG. 5(b) is a view taken along line BB in FIG. 5(a); FIG. A view taken along the line C-C in (a).

FIG. 6 is a plan view showing a first yoke and a second yoke according to the second embodiment.

FIG. 7 is a side sectional view of the electromagnetic relay according to the second embodiment after the electromagnet is assembled.

FIG. 8(a) is an exploded side view showing a driving part of a conventional electromagnetic relay, and FIG. 8(b) is a side view of the conventional electromagnetic relay in an assembled state.

FIG. 9 (a) is a front view showing another conventional electromagnetic relay; (b) is an exploded front view showing the electromagnet of the same electromagnetic relay;
(c) is a side view of the coil bobbin of the same electromagnetic relay.

[Explanation of symbols]

1, 15...Coil bobbin, 1a, 1b...Terminal, 1c, 1
5c...Vacancy, 1ca, 15ca...Insertion hole, 1d...Engagement piece, 2, 20...First yoke, 2c, 20c...Press-fit protrusion, 2
d... Engagement groove, 3, 23... Second yoke, 3c, 23c... Press-fit hole, 4... Armature, 5... Leaf spring, 6... Card, 6b
... Actuation piece, 10... Contact block, 10b... Through hole, 10
c...Engagement hole, 10d...Contact body, 10e...Terminal, 10f...
Both sides, 10g...Engagement piece.

Claims (3)

[Claims] 1. Two yokes (2, 3) provided on the coil bobbin such that one end side of each overlaps on the outside of the coil bobbin (1), and the other end faces each other with a gap in between within the coil bobbin. )
and at least a portion located within the coil bobbin,
so as to form a magnetic circuit together with the two yokes,
In an electromagnetic relay including a movably provided armature (4) and a contact block (10) having a contact body (10d) driven by the armature, the two yokes have a substantially J-shaped cross section. a first yoke (2) having a step (2e) and a press-fitting protrusion (2c) on one end side of a portion protruding outside the width of the coil bobbin; A press-fit hole (3
c), and the second yoke (3) is fixed by press-fitting the press-fit protrusion into the press-fit hole at one end side of the first yoke and the second yoke. Electromagnetic relay. 2. A coil bobbin (1) with a through-shaped insertion hole (1ca) formed in the center, one end side of each of the coil bobbin overlaps on the outside of the coil bobbin, and each other end has a gap with respect to the inside of the insertion hole. two yokes (2, 3) inserted facing each other with a distance between them, and movable so that at least a portion thereof is located in the insertion hole and forms a magnetic circuit together with the two yokes; In an electromagnetic relay comprising an armature (4) provided at , a step (2e
) and is provided with a press-fit protrusion (2c), and an engagement groove (2d, 2d) is formed approximately at the center of the bent base piece (2a). 2); and a second yoke (3) having a substantially L-shaped cross section and provided with a press-fit hole (3c) into which the press-fit protrusion of the first yoke is press-fitted in the portion protruding from the coil bobbin; The base (10a) of the contact block (10) is formed with a recess having a width approximately equal to the width of the portion of the first yoke (2) protruding outside the coil bobbin, and both sides (10f, 1
0f), the engagement grooves (2d, 2d) of the first yoke (2)
), and the first yoke and the contact block are positioned in the horizontal direction by engagement between the engagement groove and the engagement protrusion. An electromagnetic relay featuring: [Claim 3] A coil bobbin (1
5) and two yokes (20 ,23) and
An armature (4) movably provided such that at least a portion thereof is located within the through hole and forms a magnetic circuit together with the two yokes, and a contact body (10d) driven by this armature. Contact block with (
10) The electromagnetic relay has a substantially J-shaped cross section and is provided with a press-fit protrusion (20c) with a step (20e) on one end side of a portion protruding outside the width of the coil bobbin. a second yoke (20), and a second yoke (20) having a substantially L-shaped cross section and having a press-fit hole (23c) into which a press-fit protrusion of the first yoke is press-fit, in a portion that protrudes to the outside of the coil bobbin.
The through hole of the yoke (23) and the coil bobbin (15) has a hole (15c) into which the bent piece (23b) of the second yoke (23) is loosely fitted, and a hole (15c) of the first yoke (20). An insertion hole (15ca) having a diameter corresponding to the width (L3) and thickness (L3') of the bent piece (20b) and formed from one end of the coil bobbin to the central position, The first yoke is press-fitted into the insertion hole, and the second yoke is located in the hole, and is fixed by press-fitting the press-fit protrusion into the press-fit hole at one end side of the first yoke and the second yoke. An electromagnetic relay characterized by: