JPH0770282B2 - Electromagnetic relay - Google Patents

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 a size and shape approximately the same as an IC.

[0002]

2. Description of the Related Art As a conventional electromagnetic relay of this type, an armature is housed in a through hole of a coil bobbin in order to reduce the size of the electromagnetic relay, for example, Japanese Patent Publication No. 63-29813.
There is an electromagnetic relay disclosed in the publication. A side view of the disassembled drive portion of this electromagnetic relay is as shown in FIG.

A coil bobbin 30 around which a coil is wound is provided with a through hole and a guide groove, and substantially U-shaped yokes 31 and 32 are press-fitted and arranged in the guide groove from opposite directions. After press-fitting the yokes 31 and 32, an armature 36 having a hinge spring 33 fixed in advance at one end is inserted into the through hole to fix the other end of the hinge spring 33 to the yoke 31. After that, as shown in FIG. 8B, the contact block is united and the assembly is completed. In the assembled state, the assembly of the yokes 31, 32 has a horseshoe shape, and the armature 36 is attracted to the magnetic gap 35 portion by energization of the coil wound around the coil bobbin 30, and various contact block 40 portions are used. A switching operation can be performed.

[0004]

However, the magnetic strength in the magnetic gap 35, which is one of the factors that influence the operation of the amateur that influences the performance of such an electromagnetic relay, is 2 times this gap (distance). Since it is inversely proportional to the power, strict dimensional accuracy is required. However, since it is in 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 pieces 32, that is, the two yokes, which form the magnetic circuit, are overlapped with each other outside the coil bobbin 30 by press fitting and fixed to the coil bobbin 30, FIG.
As shown in, the relative positional relationship between the yoke 31 and the magnetic pole pieces 32 depends on how to apply the horizontal forces H1 and H2 at the time of 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 pole piece 32. The front surface of the overlapping portion A is not in close contact with each other in a plan view. In the first place, there are variations in the manufacture of each yoke itself, variations in the manufacture of coil bobbins made of molding material, and different materials with these variations in manufacturing are
Since they are press-fitted together while sliding, they do not make surface contact but line contact or point contact. for that reason,
Also in the overlapping portion A, the magnetic resistance increases, and the electromagnetic force of the entire magnetic circuit decreases, which hinders the increase in the operating speed of the electromagnetic relay.

Further, since the two yokes are fixed to the coil bobbin only by press-fitting, if the number of times the armature is operated exceeds tens of thousands of times, there is a risk of misalignment between the two, resulting in a malfunction.

Therefore, this electromagnetic relay is shown in FIG.
As shown by the alternate long and short dash line, the yokes 31 and 32 before assembly
On the other hand, it is conceivable to perform a special bending process in advance to apply a pressing force to the contact surface between the yokes, but there is a limit to the pressing force that can be applied to the coil bobbin made of a molding material that is weaker in strength than a metal material. Yes, it cannot go from line contact to surface contact. Further, it is not economical to bend or process the yoke and the coil bobbin with high dimensional accuracy, because the cost of parts is significantly increased.

In order to increase the press-fitting strength of the coil bobbin, it is considered that the bobbin is enlarged to increase the wall thickness, or the width and height of the guide groove 30a are reduced to increase the wall thickness.
Increasing the coil bobbin is against the purpose of downsizing, and decreasing the width and height of the guide groove reduces the press-fitted yoke and increases the magnetic resistance. Not compatible.

For this reason, it is conceivable that a special post-treatment such as using an elastic band or welding is performed on the overlapping portion A, but this method increases the number of steps, and presses the coil-wound yoke. Performing such a processing after performing increases the risk of damage to parts and deteriorates the yield. Furthermore, when the two yokes 31 and 32 are fitted in a halfway state, the relative positional relationship between the yoke and the contact block is displaced in the direction of the arrow in FIG. There is also a risk of touching and causing contact failure.

Furthermore, the yokes 31 and 32 increase in the joint portion A of each other by the total thickness, which is against the purpose of downsizing. For example, the overlapping portion A of the yokes 31 and 32
Although it is possible to reduce the thickness by scraping or crushing, there is a constraint that it cannot be less than the thickness required for the bending process, and a predetermined thickness is required and Magnetic resistance increases. At this time, if the overlapping portion A is in a completely surface contact state, there is no problem, but if a force is applied after inserting the coil into the bobbin around which the coil is wound, the coil or the like will be damaged. Similarly, a new problem arises such that the contact state is inevitable.

In any case, the dimension L0 after assembly due to the relative positional relationship among the yoke 31, the pole piece 32, and the coil bobbin 30 is the dimensional accuracy of the coil bobbin 30 made of the molding material and the horizontal force H1 at the time of press fitting. , H2, the point determined by how to apply H2, yoke 31 and pole piece 32
There is a fundamental problem in that the force V in the short-side direction is applied to the coil bobbin during or after the insertion, and the magnetic resistance is influenced by the force.

Next, FIG. 9 (a) shows a Japanese Patent Publication No. 63-2981.
It is a front view of the electromagnetic relay disclosed by the 4th publication.
As shown in the exploded front view of the electromagnet portion of FIG. 9B, this electromagnetic relay 41 has a substantially U-shaped yoke 42 in the guide groove 41a and pieces 42a and 43a of the 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), the diameter of the through hole 44a penetrating the coil bobbin 44 is increased to about the width of the yoke 42 and the pieces 42a and 43a of the pole piece 43. Further, in order to make the contact state between the yoke 42 covering the outside of the coil bobbin 44 and the end surface of the pole piece 43 more closely, the yoke 42 side is previously bent at a slightly acute angle as shown by the dotted line in the figure. Therefore, at the time of assembly, the yoke 42 and the pole piece 43 are both guided by the guide groove 41a.
With reference to the pieces 42a and 43a inserted in, the free end of the yoke 42 obtains a restoring force on the coil side and presses against the end surface of the pole piece 43 to form a horseshoe-shaped magnetic circuit.

However, in this electromagnetic relay 41, the free end of the yoke 42 obtains a restoring force on the coil side and presses against the end face of the pole piece 43, as in the conventional example. The contact state with the end surface of the guide groove varies greatly depending on the machining accuracy of the guide groove 41a and the pieces 42a and 43a and the dimensional tolerance between the guide groove 41a and the pieces 42a and 43a, and stable contact can be obtained. Sometimes you can't. In this case, the contact portion between the free end portion of the yoke 42 and the end surface of the magnetic pole piece 43 must be subjected to special treatment such as welding and scissors.

Further, with respect to the guide groove 41a, the pieces 42a,
Since all 43a are press-fitted, a large force is required at the time of assembly and a large force is applied to the coil bobbin 44, which may damage the coil bobbin 44.
Further, since the contact state between the free end portion of the yoke 42 and the end surface of the pole piece 43 can be confirmed for the first time after assembly, even if a defect is found after press fitting, it cannot be disassembled again and the contact state is corrected. Therefore, when a force is applied, this force is directly applied to the guide groove 41a and there is a possibility that the guide groove 41a is similarly damaged.

A first object of the present invention is to solve the drawbacks of the conventional electromagnetic relay described above and to provide a small electromagnetic relay of high precision and easy to manufacture, which is of the same size as an IC. A second object of the present invention is to provide an electromagnetic relay in which an overpressure is not applied to the coil bobbin when the electromagnetic relay achieving the above object is assembled and the assembly is easy.

[0016]

In order to achieve the above-mentioned object, the electromagnetic relay of the present invention has a coil bobbin having a through hole formed therein and one end side of each coil bobbin on the outer side of the coil bobbin overlapping with each other in the through hole. Of the two yokes inserted into the through holes of the coil bobbin so that the other ends thereof face each other with a gap, and at least a part of the yokes are located in the through holes to form a magnetic circuit with the two yokes. In order to form, in the electromagnetic relay provided with the armature 4 provided movably, and the contact block 10 having the contact body 10d driven by the armature 4, in claim 1, the two yokes are A first yoke having a substantially J-shaped cross section and provided with a press-fitting protrusion 2c having a step 2e on one end side of a portion extending outside the width of the coil bobbin 1. When, in cross section a substantially L-shaped, the press-fitting hole 3c that the first press-fit protrusion 2c of the yoke 2 is press-fitted in the portion out to the outside of the coil bobbin 1 is provided with 2
And a yoke 3, the first yoke 2 and the second yoke 3
Is fixed by press-fitting the press-fitting protrusion 2c into the press-fitting hole 3c at one end side thereof.

Further, in claim 2, a through-bore 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-fitting projection 2c having a step 2e on one end side of a portion which is outside the coil bobbin 1 from the width of the portion inserted into the insertion hole 1ca. A first yoke 2 having engaging grooves 2d, 2d formed at a substantially central position of the bent base piece 2a; and a first yoke 2 having a substantially L-shaped cross section and extending to the outside of the coil bobbin 1. 1 and a second yoke 3 provided with a press-fitting hole 3c into which the press-fitting projection of the yoke 2 is press-fitted.
The base 10a of No. 0 is formed with a recess having a width substantially equal to the width of the portion of the first yoke 2 that extends outside the coil bobbin 1, and the sides of the first yoke 2 are engaged with the recesses of the first yoke 2 on both sides 10f and 10f. Engaging projections 10g, 10 that engage with the mating grooves 2d, 2d
g, the engaging groove 2d and the engaging protrusion 10 are provided.
By engaging with g, the first yoke 2 and the contact block 10 are positioned in the horizontal direction.

Further, in claim 3, the first yoke 20 has a substantially J-shaped cross section, and a press-fitting protrusion 20c is provided on one end side of a portion protruding outward from the width of the coil bobbin 15 with a step 20e. , The coil bobbin 1 having a substantially L-shaped cross section
5, the press-fitting projection 2 of the first yoke 20 is provided on the outer side of the first yoke 20.
The second yoke 23 having the press-fitting hole 23c into which 0c is press-fitted and the through hole of the coil bobbin 15 are the holes 15c into which the bent pieces 23b of the second yoke 23 are loosely fitted.
And an insertion hole 15ca having a diameter corresponding to the width L3 and the thickness L3 ′ of the bent piece 20b of the first yoke 20 and formed from one end of the coil bobbin 15 to the central position. The first yoke 20 is press-fitted into the insertion hole 15ca, and the second yoke 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-fitting projection 20c into the press-fitting hole 23c at one end side.

[0019]

In the first embodiment, the first yoke 2 having a substantially J-shaped cross section is used.
And the bent pieces 2b, 3b on the other end side of each second yoke 3 having a substantially L-shaped cross section are inserted into the insertion hole 1ca of the coil bobbin 1,
Inserted from opposite directions.

After the insertion, the press-fitting protrusion 2c of the first yoke 2 is press-fitted and fixed in the press-fitting hole 3c of the second yoke 3, so that they are mechanically and magnetically completely joined,
There is no increase or decrease in the 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 and fixed in the insertion hole 15ca of the coil bobbin 15. The second yoke 23 is loosely fitted in the hole 15c. After the insertion, the press-fitting protrusion 20c of the first yoke 20 is press-fitted and fixed in the press-fitting hole 23c of the second yoke 23, thereby mechanically and magnetically joining to form a magnetic circuit.
Further, during press fitting, overpressure is not applied to the coil bobbin 15.

In the yoke assembly including the first and second yokes, the armature 4 is moved by energizing the coils wound around the coil bobbins 1 and 15, and the leaf spring 5 restores the armature 4 in the non-energized state. A desired switching operation is performed by the movement of the amateur 4.

[0023]

1 is an exploded perspective view showing a first embodiment of an electromagnetic relay of the present invention, FIGS. 2A and 2B are a side view and a plan view of a first yoke, and FIG. And (d)
[Fig. 6] is 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 operating power. The coil bobbin 1 is formed with a hole 1c penetrating therethrough, and an armature 4 to be described later is operably arranged in the hole 1c in an assembled state. Furthermore, this hole 1
A slightly larger diameter insertion hole 1ca is opened in c. Further, on the opposite side of the terminals 1a and 1b, the engaging pieces 1d and 1b are provided.
d is formed to project.

The first yoke 2 is bent in a substantially J shape and has a base piece 2a and a bent portion 2b.
Is inserted into the insertion hole 1ca of the coil bobbin 1. Further, on one end side of the base piece portion 2b, a stepped portion 2e is formed in a portion protruding outside the coil bobbin 1 from a width of a portion to be inserted into the insertion hole, and a press-fitting protrusion 2c having a tapered tip is formed to project. The engaging grooves 2d, 2d for positioning are formed at the substantially central position.

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

The base piece 3a of the second yoke 3 having the substantially L shape.
Has a base end 5a of the leaf spring 5 fixed thereto, 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. . The free end portion 4b of the armature 4 is fixedly engaged with the engaging portion 6a of the card 6.

Next, the base 1 constituting the contact block 10
A recess having a width substantially equal to the width of the portion of the first yoke 2 extending outside the coil bobbin is formed in 0a, and the through hole 10b corresponding to the coil terminals 1a, 1b is formed at the end position.
10b is provided, and engaging holes 10c, 10c are provided corresponding to the engaging pieces 1d, 1d.

On both sides 10f, 10f corresponding to the width of the first yoke 2 of the recess of the base 10a, engaging pieces 10g, 10g corresponding to the engaging grooves 2d, 2d of the first yoke 2, respectively.
Is provided.

Further, in the 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 the terminal 10e. Has been.

Next, the assembly of the electromagnetic relay having the above structure will be described. First, the bent portions 2b and 3b of the first yoke 2 and the second yoke 3 are inserted from the facing positions of the insertion holes 1ca of the coil bobbin 1 and assembled in the directions shown by arrows B and C in FIG. At this time, in FIG. 2, arrow B,
A force in the direction indicated by C is applied to press-fit the press-fitting protrusion 2c of the first yoke 2 into the press-fitting hole 3c of the second yoke 3. First yoke 2
As for the relative positional relationship between the coil and the second yoke 3 with respect to the coil bobbin 1, as shown in FIG. 3, the horizontal dimension L1 is defined by the position of the step 2e of the first yoke, and the vertical dimension L2 is the second dimension. It is defined by the position of the press-fitting hole 3c of the yoke 3, and these can be assembled with the dimensional accuracy at the time of molding, so there is no overpressure on the side of the coil bobbin 1.

As a result, the first and second yokes 20 and 23 form a yoke assembly composed of a C-shaped magnetic circuit. Since the press-fitting fixed portion is a state in which the metal materials are completely mechanically and magnetically joined to each other, the magnetic resistance at the press-fitted portion does not increase at all.

The horizontal dimension L1 of the yoke assembly is also
Is positioned to a size defined by the step portion 2e of the first yoke 2, and is vertically positioned to a size defined by the position of the press-fitting hole 3c of the second yoke 3. for that reason,
The magnetic gap D is accurately set to a predetermined dimension even in consideration of manufacturing variations. Further, the yoke assembly can be assembled with sufficiently high accuracy in both horizontal and vertical dimensions while using a coil bobbin which is a conventional molding member.

Each component such as the yoke assembly, the armature 4 and the card 6 is assembled to the coil bobbin 1 and the structure shown in FIG.
After the electromagnet shown in (1) is created, the contact block 10 is integrated with 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 arrow direction of FIG.
The coil bobbin 1 and the yoke assembly are positioned on the contact block 10 by engaging the holes d, 1d with the engaging holes 10c, 10c.

Further, the first yoke 2 has both side portions 10
Since the engaging grooves 2d, 2d engage with the engaging pieces 10g, 10g of the contact block 10 while fitting into the f, 10f,
The relative positional relationship between the yoke assembly and the contact block 10 can also be accurately positioned. With the above assembly, FIG.
Assemble the electromagnetic relay shown in the bottom side

For the assembled electromagnetic relay, the terminals 1a,
By supplying power to 1b, the first yoke 2 and the second yoke 2
In the gap between the yokes 3, the armature 4 is attracted to this yoke assembly side, and the operating piece 6b of the card 6 is contacted with the contact body 10.
By moving in the direction d, the contact 10d is switched and the terminal 10e is electrically switched.

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

Next, a second embodiment of the electromagnetic relay of the present invention will be described. Hereinafter, in this embodiment, the changed portion of the electromagnet will be described, and the description of the same portions as those in the above embodiment will be omitted. FIG. 5 shows a coil bobbin according to the second embodiment. (A) is a side sectional view of the coil bobbin, (b) is a view taken along the line BB of (a), (c) of FIG. Is
It is a CC line arrow view of (a).

A hole 15c is formed through the coil bobbin 15 so as to penetrate therethrough, and the armature 4 is operably disposed in the hole 15c in an assembled state. As for the hole 15c, as shown in FIG. 5 (c), the upper edge 15cb has a width L.
5, the lower edge 15cc has a width L3 (L3> L5) 4
The upper edge of the side portion of the prism is formed so as to be inclined.
The inclined piece portion 15cd is formed on the upper side edge portion 15ce which is formed at a right angle with respect to the lower edge portion 15cc.
connected to cb. Further, as shown in FIG. 5B, an insertion hole 15ca having a slightly larger diameter is formed in the hole 15c from one end of the coil bobbin 15 to a substantially central position. The insertion hole 15ca has a width L3 and a thickness L3 ′ of a bent portion 20b of the first yoke 20, which will be described later.
Is formed. The thickness L of the insertion hole 15ca
3'is shorter than the length L6 of the inclined piece portion 15cd formed in the hole 15c (L3 '<L6).

The first yoke 20 and the second yoke 23 shown in FIG. 6 are inserted into the coil bobbin 15, respectively. First
The yoke 20 has a base piece portion 20a and a bent portion 20b, each of which has a width L3 and a thickness L3 'and is bent and formed into a substantially J shape. On one end side of the base piece 20a, a step 20e is formed in a portion protruding to the outside of the coil bobbin 15, and a press-fitting protrusion 20c having a taper is formed at the tip end thereof, and the contact block 10 is formed at a substantially central position. Engaging pieces 10g, 10
Positioning engaging grooves 20d, 20d at positions corresponding to g
Are formed.

The second yoke 23 is formed in a substantially L shape with a width L4 and a thickness L4 ', and has a base piece portion 23a and a bent portion 23b. The bent portion 23b has a hole 15 in the coil bobbin 15.
inserted in c. The coil bobbin 15 is provided on 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 a portion that is exposed to the outside.

Next, the assembly of the electromagnet having the above structure will be described. FIG. 7 shows a state in which the electromagnet is assembled. The first yoke 20 and the second yoke 23 are shown.
Is assembled upside down unlike the first embodiment. Assembling is first performed by the bent portion 20b of the first yoke 20.
Is inserted from the insertion hole 15ca portion on one end side of the coil bobbin 15. In this state, the base piece portion 20a has the coil bobbin 15
Of the press-fitting protrusion 20c
Is located above 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 portion on the other end side. At the time of this insertion,
The second yoke is loosely fitted in the hole 15c,
No force is applied to the holes 15c. After that, the press-fitting protrusion 20c of the first yoke 20 is inserted into the press-fitting hole 23c of the second yoke 23.
Press fit. At the time of 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 no overpressure is applied to the hole 15c.

After assembly, the first and second yokes 20 and 23
Thus, a yoke assembly composed of a C-shaped magnetic circuit is formed. Since the press-fitting fixing point is a state in which the metal materials are completely mechanically and electrically joined to each other, the magnetic resistance at the press-fitting point does not increase at all. Also, the yoke assembly is the first
Since the yoke 20 is positioned and fixed in the insertion hole 15ca, the second yoke 23 is also fixed to the first yoke 20.
Since they are joined at the press-fitting holes 20c and 23c, which are the joining portions between and, they can be similarly positioned.

The horizontal dimension L of the yoke assembly
7 is positioned to a dimension defined by the step portion 20e of the first yoke 20, and the press-fitting hole 2 of the second yoke 23 is arranged in the vertical direction.
The magnetic gap D is positioned at a dimension defined by the position of 3c, and the magnetic gap D is accurately set to a predetermined dimension. Also, while using the coil bobbin which is a conventional mold member,
The yoke assembly can be assembled with sufficient accuracy in both horizontal and vertical dimensions. This prevents overpressure on the side of the coil bobbin 1 during assembly.

Thereafter, the coil bobbin 1 is used as in the above embodiment.
Each component such as the yoke assembly, the armature 4 and the card 6 is assembled to 5 to form an electromagnet, and the contact block 10 is integrated with this electromagnet to form an electromagnetic relay.

[0046]

As described above, according to the present invention, the first yoke having a substantially J-shaped cross section is provided with the step and the press-fitting protrusion is provided, and the second yoke having the substantially L-shaped cross section is provided with the press-fitting hole. Provided,
Since the press-fitting protrusion of the first yoke is press-fitted into the press-fitting hole of the second yoke while the both are inserted into the coil bobbin so that the yoke assembly can be fixed to the coil bobbin, not only the dimensional accuracy of the yoke assembly but also the electromagnet can be improved. The relative positioning accuracy of each of the yoke assembly and the coil bobbin is significantly improved as compared with the conventional product, and an error does not occur due to the pressing force when the yoke is press-fitted.

Further, the base of the contact block is formed with a recess having a width substantially equal to the width of the portion of the first yoke extending outside the coil bobbin, and the engaging groove of the first yoke is formed on both sides thereof. If the engaging protrusion that engages with is provided, the electromagnet and the contact block can be assembled with high dimensional accuracy in the horizontal direction.

Further, the through hole portion of the coil bobbin is first
Since the insertion hole into which the yoke is press-fitted and the hole into which the second yoke is loosely fitted are configured, the assembly of the electromagnet can be facilitated and the assembly can be performed without damaging the coil bobbin.

Further, the dimensional accuracy required for each component is less than that of the conventional product, the assembly is easy, the coil bobbin is not damaged by applying excessive force, and the manufacturing variation is small, and the mass production is economical. Is.

Further, since there is no fear that the positional relationship between the yoke assembly, the armature, and the contact block will change due to high-speed operation and aging, it is durable and reliable even though the size is about the same as the IC size. It is possible to obtain a high electromagnetic relay.

[Brief description of drawings]

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

2 (a) and (b) are the first of the electromagnetic relays of FIG.
The side view and top view of a yoke, (c) and (d) are the side view and rear view which show a 2nd yoke.

FIG. 3 is a schematic cross-sectional view showing a state where the electromagnet of the electromagnetic relay in FIG. 1 is incorporated in 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.

5A is a side sectional view showing a coil bobbin according to a second embodiment of the present invention, FIG. 5B is a view taken along the line BB in FIG. 5A, and FIG. The CC line arrow view of (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 of the second embodiment after the electromagnet is assembled.

FIG. 8A is an exploded side view showing a driving portion of a conventional electromagnetic relay, and FIG. 8B is a side view showing a state in which the conventional electromagnetic relay is assembled.

9A is a front view showing another conventional electromagnetic relay, FIG. 9B is an exploded front view showing an electromagnet of the electromagnetic relay, and FIG. 9C is a side view of a coil bobbin of the electromagnetic relay.

[Explanation of Codes] 1,15 ... Coil bobbin, 1a, 1b ... Terminal, 1c, 1
5c ... hole, 1ca, 15ca ... insertion hole, 1d ... engaging piece,
2, 20 ... First yoke, 2c, 20c ... Press-fitting protrusion, 2d
... engagement groove, 3,23 ... second yoke, 3c, 23c ... press-fitting hole, 4 ... amateur, 5 ... leaf spring, 6 ... card, 6b ...
Operating piece, 10 ... Contact block, 10b ... Through hole, 10c
... engaging holes, 10d ... contact bodies, 10e ... terminals, 10f ... both sides, 10g ... engaging pieces.

Claims (3)

[Claims] 1. Two yokes (2, 3) provided on the coil bobbin so that one end portions of the coil bobbin overlap each other outside the coil bobbin (1) and the other ends of the coil bobbin face each other with a gap therebetween. )
And at least a part of which is located in the coil bobbin,
To form a magnetic circuit with the two yokes,
In an electromagnetic relay provided with an movably provided armature (4) and a contact block (10) having a contact body (10d) driven by the amateur, the two yokes have a substantially J-shaped cross section. First yoke (2) in which a press-fitting protrusion (2c) having a step (2e) is provided on one end side of a portion protruding outward from the width of the coil bobbin.
And a second yoke (3) having a substantially L-shaped cross section and provided with a press-fitting hole (3c) into which a press-fitting protrusion of the first yoke is press-fitted in a portion protruding to the outside of the coil bobbin. An electromagnetic relay, wherein the first yoke and the second yoke are fixed by press-fitting the press-fitting projections into the press-fitting holes at one end side thereof. 2. A coil bobbin (1) having a penetrating insertion hole (1ca) formed in the center thereof, and one end sides of the coil bobbin overlap outside the coil bobbin, and the other end of the coil bobbin has a gap. And two yokes (2, 3) inserted so as to face each other and movable so that at least a part thereof is located in the insertion hole and forms a magnetic circuit together with the two yokes. In an electromagnetic relay provided with an armature (4) provided in a 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 press-fitting protrusion (2c) having a step (2e) is provided on one end side of a portion protruding to the outside of the coil bobbin with respect to the width of the portion to be inserted into the insertion hole, and the bent base piece is formed. Department ( Engaging groove in a substantially central portion position of a) (2
d, 2d) is formed on the first yoke (2), and the first yoke (2) is formed on a portion having a substantially L-shaped cross section and protruding outside the coil bobbin.
The second yoke (3) is provided with a press-fitting hole (3c) into which the press-fitting protrusion of the yoke is press-fitted, and the base (10a) of the contact block (10) has the first yoke (2). Is formed with a recess having a width substantially equal to the width of the portion of the coil bobbin protruding to the outside of the coil bobbin.
f), the engaging groove (2d, 2d) of the first yoke (2)
Engagement protrusions (10g, 10g) for engaging with are provided, and the first yoke and the contact block are positioned in the horizontal direction by the engagement between the engagement groove and the engagement protrusion. A characteristic electromagnetic relay. 3. A coil bobbin (1) having a through hole formed therein.
5) and two yokes (20) which are inserted into the through holes of the coil bobbin so that one end portions of the coil bobbin overlap each other and the other ends of the coil bobbin face each other with a gap in the through hole. , 23),
An armature (4), at least a part of which is located in the through hole and is movably provided so as to form a magnetic circuit with the two yokes, and a contact body (10d) driven by the armature. An electromagnetic relay having a contact block (10) having a stepped portion (20e) having a step (20e) at one end of a portion that is substantially J-shaped in section and extends outside the width of the coil bobbin. And a second yoke having a substantially L-shaped cross section and a press-fitting hole (23c) into which a press-fitting projection of the first yoke is press-fitted in a portion that is outside the coil bobbin. The yoke (23) and the through hole of the coil bobbin (15) have a hole (15c) into which the bent piece (23b) of the second yoke (23) is loosely fitted, and a first yoke (20). Of the bent piece (20b) (L3) and a diameter corresponding to the thickness (L3 ′), and an insertion hole (15ca) formed from one end of the coil bobbin to a central position thereof. The first yoke serves as an insertion hole. The electromagnetic relay is press-fitted, the second yoke is located in the hole, and is fixed by press-fitting the press-fitting projection into the press-fitting hole at one end side of the first yoke and the second yoke. .