JPS5821374B2 - electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic relay that is easy to assemble and economical.

A conventionally widely used electromagnetic relay is shown in Fig. 1, where 1 is an iron core, 2 is a yoke, 3 is a cover guide, 4 is an armature, 5 is a hinge spring, 6 is a coil, and 7 is a Card 8 is a balance spring.

FIG. 2 shows the contact parts of the electromagnetic relay shown in FIG. 1 in detail; 9 is a break contact spring, 10 is a break contact, 11 is a make contact spring, 12 is a make contact, 13, 1
3' is a fixed contact.

When a voltage is applied to the coil 6 in such an electromagnetic relay, a magnetic attraction force is generated in the iron core 1, and the portion of the armature 4 facing the iron core 1 is attracted.

At this time, the hinge spring 5 serves as a hinge when the armature 4 rotates by a certain angle.

Further, the card 7 is attached to the tip of the arm of the armature 4 and moves by being pushed by the armature 4.

Break contact spring 9 and make contact spring 11 are card 7
When a voltage is applied to the coil 6, the card 7 moves upward, the break contact spring 9 is pushed up, and the break contact 10 and the fixed contact 13 are separated.

At the same time, the make contact spring 11 moves upward, and the make contact 1
2 is closed to the fixed contact 13', and the contact set is switched.

When the voltage across the coil 6 is removed, the equilibrium spring 8 in FIG.
The spring force causes the part of the armature 40 that is in contact with the iron core 1 to separate, and the card 7 attached to the armature 4 returns to its original position. As the card 7 moves downward in FIG. 2, the break contact is activated. 10 and fixed contact 13 are closed, and make contact 12 and fixed contact 13' are opened and returned to their original state.

In such a conventional electromagnetic relay, the hinge spring 5 has one end welded or caulked to the opposite side of the armature 40 facing the iron core 1, and the other end is similarly attached to the cover guide 3.

In particular, the latter connection between the cover guide 3 and the hinge spring 5 is not done in the last step of the assembly process, but the assembled parts must be connected to each other, which takes time and is a factor that hinders price reduction. It had become.

Furthermore, recent electromagnetic relays are increasingly being used in close connection with electronic circuits, and there is a demand for low-height shapes suitable for mounting on printed boards.

In view of the current situation, the present invention aims to improve the above-mentioned drawbacks in assembling the hinge spring and provide a low-cost electromagnetic relay when realizing a low-height electromagnetic relay.

3 is a schematic explanatory diagram of the electromagnetic relay of the present invention, and FIG. 4 is a schematic explanatory diagram showing the relationship between the contact spring set and the armature of the electromagnetic relay of FIG. 3. In FIG. 3, 14 is an iron core; 15 is a yoke part of the iron core, 16 is a magnetic pole piece part of the iron core, 17 is an armature,
18 is a hinge spring, 19 is a coil, 20 is a card, 21
is a balanced spring.

Further, in FIG. 4, 22 is a break contact spring, 23 is a fixed contact bar, and 24 is a make contact spring.

As is clear from both figures, the electromagnetic relay of the present application has an iron core 14 with a U-shaped cross section, and in order to reduce the height, a coil 19,
A switching contact spring set consisting of a break contact spring 22, a fixed contact bar 23, and a make contact spring 24 is arranged in a space surrounded by the yoke part 15 and the magnetic pole piece part 16, and the armature 17 has a U-shaped cross section. A yoke part 1 is attached to the opening of the shaped iron core 14.
5 and the magnetic pole piece part 16.

The operation of such an electromagnetic relay is basically the same as the relay shown in FIG.

That is, as shown in FIG. 3, when a voltage is applied to the coil 19, the armature 17 is attracted to the magnetic pole piece 16 of the iron core by the magnetic attraction force and comes into contact with the magnetic pole piece 16 of the iron core.

Further, in FIG. 4, the armature 17 drives the card 20, and the card 20 moves the break contact spring 22 and the make contact spring 24, thereby switching the contact set.

FIG. 5 shows in detail the support part of the armature 17 to the yoke part 15 by the hinge spring 18 in such an electromagnetic relay, where 15 is the yoke part, 17 is the armature, and 25 is the V-shaped part. The groove 26 is a protrusion formed by cutting a portion of the hinge spring 18 inward.

FIG. 6 is a sectional view taken along the line A-A in FIG. 5, and shows the hinge spring 1.
The one end of the side without the protrusion 26 of No. 8 has a gap between its L-shaped bent portion and the end surface of the armature 17, and is placed in advance at the armature position a predetermined distance from the end surface of the armature. Joined by welding or caulking.

This work is simple because it involves joining two parts, the hinge spring 18 and the armature 17, and can be performed automatically by a machine.

In the final assembly of the electromagnetic relay, as shown in FIG.
Hook and install.

This attachment is extremely simple, as it is only necessary to simply hook the protrusion 26 into the V-shaped groove 25, and it is advantageous because the supporting position of the hinge spring after attachment can be accurately determined at the tip of the V-shaped groove.

In addition, the connection point between the hinge spring and the armature is located away from the end face of the armature, and a gap is provided between the end face of the armature and the bent part of the hinge spring as described above, so the support point of the hinge spring is Even if there is a manufacturing error in the dimensions from to the armature connection point, the effects of the frictional force from the hinge spring that is applied to the armature's operating fulcrum and the shift of the fulcrum are extremely small.
There is no need to worry about the fulcrum sliding during armature operation and the generation of abrasion particles that will degrade the performance of the relay.

Further, FIG. 7 shows another embodiment of the armature support portion using a hinge spring, and 27 is a case of a relay.

By pressing a portion of the hinge spring 18 near the support point against the yoke 1 with a protrusion provided on the inner wall of the case 27, the support of the hinge spring is strengthened.

FIG. 8 shows another embodiment of the armature support portion using a hinge spring, and FIG. 9 is a sectional view taken along the line A-A in FIG. 8, and both FIGS. In addition to the protruding portion 26, a similar cut-and-raised stop portion 28 is provided.

In FIG. 9a, the yoke part 15 of the iron core is clamped by the spring force acting between the protruding part 26 and the stop part 28, and in FIG. It is inserted into and held in a V-shaped groove 25' provided on the opposite surface to the groove 25.

By adopting such a structure, the displacement of the fulcrum that abuts the yoke at the end of the armature when the armature is operated is reduced compared to the case where the hinge spring 18 has only the protrusion 26 as shown in Fig. 6. This can be strongly prevented, and the hinge function of the hinge spring 18 has the effect of further ensuring the movement of the armature at a constant angle.

FIG. 10 shows still another embodiment of the armature support portion using a hinge spring, and FIG. 11 shows A of FIG. 10.
-A sectional view.

In this embodiment, the hinge spring 18 has a stop 28, a protrusion.

26 is the same as that shown in FIG. 9a, but a hinge spring 18 is inserted between the yoke 15 and the armature 17.

In this way, when the armature is operated, the yoke part 1 of the armature 17
Even if there is a slight sliding movement on the fulcrum in contact with 5, it is possible to almost eliminate the generation of abrasion powder.

The reason for this is that the iron core 14 and armature 17 are usually made of pure iron, and their surfaces are plated with nickel to prevent rust, but when they directly slide relative to each other, The plated surface may peel off and generate wear particles.

However, in the present invention, a spring made of 17-7PH stainless steel or the like is used for the hinge spring, and when it slides on pure iron or nickel-plated material, hardly any abrasion powder is generated.

17-7 pH stainless steel still has magnetism, and even if it is inserted between the yoke part 15 and the armature 17, the magnetic gap will not be increased and performance such as magnetic attraction force will deteriorate. There isn't.

As described above, in the electromagnetic relay of the present invention, the protrusion formed by cutting and raising a part of the L-shaped hinge spring that supports the armature on the yoke is inserted into the V-shaped groove of the yoke. The other end of the hinge spring is fixedly connected to the armature at a position a predetermined distance from the armature end, and a gap is provided between the bent portion of the L-shaped hinge spring and the armature end. The hinge spring can be attached to the yoke by simply inserting and hooking the protrusion into the V-shaped groove, which also determines the fulcrum of the hinge spring.

Therefore, it is possible to provide an electromagnetic relay that is extremely easy to assemble and can be completed in a short time, and is highly economical.It also eliminates the effects of frictional force from the hinge spring acting on the fulcrum of the armature when the armature is operated. This eliminates the generation of abrasion powder due to sliding of the armature with the yoke, which has the effect of improving the operating performance of the armature.

[Brief explanation of the drawing]

Figure 1 is a schematic explanatory diagram of a conventional electromagnetic relay, and Figure 2 is a schematic illustration of a conventional electromagnetic relay.
3 is a schematic explanatory diagram of the electromagnetic relay of the present invention; FIG. 4 is a schematic explanatory diagram showing the relationship between the contact spring set and the armature of the relay of FIG. 3; Fig. 5 is a diagram showing details of the hinge spring portion in the electromagnetic relay of the present invention, and is a partially cutaway perspective view showing the hinge spring attached to the armature and the yoke, and Fig. 6 is a view taken along line A-A in Fig. 5. 7 is a cross-sectional view showing another embodiment of the hinge spring portion in the electromagnetic relay of the present invention, and FIG. 8 is a cross-sectional view showing another hinge spring in the electromagnetic relay of the present invention attached to the armature and the yoke portion. FIG. 9 is a partially cutaway perspective view, FIG. 9 is a cross-sectional view taken along the line A-A in FIG. Figure 11 is the 10th
It is a sectional view taken along the line AA in the figure. 14...Iron core, 15...Yoke part, 16
...Magnetic pole piece, 17... Armature, 18
...Hinge spring, 19...Coil, 2
0...Card, 21...Equilibrium spring, 2
2... Break contact spring, 23... Fixed contact bar, 24... Make contact spring, 25...
...V-shaped groove, 26...Protrusion, 27
...Case, 28...), top part.

Claims (1)

[Scope of Claims] 1. A U-shaped iron core whose open end is formed by a yoke portion and a magnetic pole piece portion, and a U-shaped iron core configured to bridge between the yoke portion and the magnetic pole piece portion of the U-shaped iron core. In an electromagnetic relay comprising a disposed armature and an L-shaped hinge spring that supports the armature on the yoke part, a part of one side piece of the L-shaped hinge spring is moved inward. Insert the cut and raised protrusion into the V-shaped groove provided on the opposite side of the armature of the yoke, and further toward the magnetic pole piece from the end of the armature, which is arranged offset from the L-shaped bent part of the hinge spring so that there is a gap between the L-shaped bent part and the end face of the armature. An electromagnetic relay characterized in that the armature is fixedly connected to the position of the armature. 2. A U-shaped iron core whose open end is formed by a yoke portion and a magnetic pole piece portion, and an armature arranged to bridge between the yoke portion and the magnetic pole piece portion of the U-shaped iron core. and an L-shaped hinge spring that supports the armature on the yoke part, the electromagnetic relay is formed by cutting a part of one side piece of the L-shaped hinge spring inward. a protruding portion provided on a side surface of the yoke portion opposite to the side on which the armature is disposed facing the V;
A stop portion formed by inserting into the side piece and cutting and raising a portion of the side piece different from the protruding portion inward is attached to the yoke portion on the side opposite to the surface where the V-shaped groove is formed. The end of the other side piece of the L-shaped hinge spring is brought into contact with the surface, and the L-shaped bent portion of the hinge spring has a gap between the L-shaped bent portion and the end face of the armature. An electromagnetic relay characterized in that the armature is fixedly coupled to a position of the armature that is further closer to the magnetic pole piece than the end face of the armature that is arranged offset from the end face of the armature.