JP2920996B2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] An electromagnetic relay has an iron core and a yoke, and has a purpose of preventing buckling even if the height of the iron core is adjusted by crushing. Is made of a magnetic material that generates a magnetic field, has a core head at one end, a coil wound around an intermediate portion, and a core bottom surface at the other end, and the core is an iron core. The bottom surface has a support protrusion and a radial or concentric adjustment protrusion, and the yoke is made of a magnetic material having a substantially L shape in a side view, and has a hole at one end and a hole at the other end. When the support protrusion is inserted into the hole of the yoke in a substantially U-shape when viewed from the side, the adjustment protrusion can adjust the height difference between the iron core head and the hinge portion. It is constituted so that it may be crushed.

[Industrial applications]

The present invention relates to an electromagnetic relay, and more particularly to a structure of an iron core capable of obtaining high assembly accuracy.

2. Description of the Related Art In recent years, with the progress of electronics centering on semiconductor ICs, general electronic components have been forced to change greatly.

In general, electromagnetic relays, which are called electromagnetic relays and are distinguished from semiconductor relays, are no exception, and various improvements have been made.

Since an electromagnetic relay involves a mechanical operation, the operation time is orders of magnitude slower than a so-called semiconductor relay using a semiconductor as a switching element. However, there are features such as the ability to intermittently handle large currents, the impedance becoming infinite when disconnected, and the polarized electromagnetic relay incorporating a permanent magnet that has a self-holding function. On the other hand, demand and applications are expanding and mass production is taking place.

On the other hand, since the electromagnetic relay is a mechanical component that can be mechanically assembled, the variation in characteristics largely depends on the manufacturing technology of the assembly.

From these things, how to automatically assemble the electromagnetic relay,
Moreover, it is important to stabilize the performance by increasing the assembly accuracy.

[Conventional technology]

In general, electromagnetic relays are classified into various forms according to applications, but basic components are an electromagnet, a spring, and an electric contact.

 FIG. 4 is a basic configuration diagram of the electromagnetic relay.

In the figure, 1 is an iron core, 2 is a yoke, 3 is an armature, 4a is a movable spring, 4b is a fixed spring, and 10 is an electromagnet.

The iron core 1 is made of a magnetic material, and has an iron core head 1a at one end,
It has a coil 1b wound around an intermediate portion and a core bottom 1c at the other end. Thus, the electromagnet 10 is configured.

This coil 1b has a configuration wound directly around the iron core 1,
There is a configuration in which a winding wound in a cylindrical shape in advance is inserted into the iron core 1.

The electromagnet 10 applies a current to the coil 1b to magnetize the iron core 1 to obtain a magnetic attractive force. Many electromagnets operate by direct current, but there are also electromagnets that are combined with a rectifier to cause alternating current.

The yoke 2 has, for example, an L-shape in a side view and is made of a magnetic rod or plate, and has a hole 2a at one end.
A support protrusion 11 provided on the iron core bottom surface 1c is inserted into the hole 2a so as to be substantially U-shaped when viewed from the side. The other end is a so-called hinge portion 2b provided with a hinge.

The armature 3 is made of, for example, a magnetic body shaped like a letter when viewed from the side. The armature 3 is rotatably supported by the hinge 2b of the yoke 2 around a middle bent portion, and one end of the armature 3 is attached to the iron core head 1a. They approach and retreat.

The spring 4 includes, for example, a movable spring 4a and a fixed spring 4b. A contact 5 is provided at one end of each of the contacts 5 so as to face each other. The other end of each of the contacts 5 is supported via an insulating material.

Since the other end of the armature 3 is pressed by the movable spring 4a, the one end is constantly urged away from the iron core head 1a, and a load P is applied.

In the electromagnetic relay having such a configuration, when a current flows through the coil 1b, the iron core 1 becomes a magnet, and one end of the armature 3 is attracted to the iron core 1 against the load P and hits the iron core head 1a.

As a result, a magnetic circuit is formed between the iron core 1, the yoke 2, and the armature 3.

In this way, since the armature 3 is supported by the hinge 2b of the yoke 2 as a fulcrum, the movable spring 4a is pressed by the other end of the armature 3 and the contact points of the movable spring 4a and the fixed spring 4b 5 comes into contact and closes, and the electromagnetic relay is closed.

When the current flowing through the coil 1b is cut off, the armature 3 is pushed back to the movable spring 4a having the load P, so that the movable spring 4a
And the respective contacts 5 of the movable spring 4a are opened, the armature 3 is separated from the core head 1a, and the electromagnetic relay is opened.

Here, the electromagnetic relay called a non-polar type has been described. However, the respective contact points 5 of the movable spring 4a and the fixed spring 4b once stably come into contact with each other and maintain a closed state. Also, some electromagnetic relays are self-holding, as in the case of a so-called polarized electromagnetic relay with a permanent magnet, where the contacts remain closed even when the current flowing through the coil of the electromagnet is cut off. Some types of electromagnetic relays are also available.

By the way, the electromagnetic relay is evaluated by various characteristics such as a moving current flowing through the coil 1b when the contact 5 operates and a holding current when the contact 5 keeps a stable closed state. The factor that determines the life of the contact 5 is related to the behavior when the contact 5 makes contact.

That is, when one end of the armature 3 is attracted to the iron core head 1a, the contact 5 rotates about the hinge 2b of the yoke 2, and
The other end first presses the movable spring 4a and urges it in the direction of the fixed spring 4b, so that the respective contacts 5 come into contact with each other. This contact 5
The so-called operation time from the open state to the closed state is at most several seconds to several tens of milliseconds. At this time, the contacts 5 slide on each other on the contact surfaces.

The surfaces of the contacts 5 must be clean because they are electrically contacted, but the sliding between the contacts 5 functions to peel off the surface of the contacts 5 to make them electrically clean. In addition, the degree of the sliding is more effective when the contact pressure of a so-called contact that presses the movable spring 4a against the movable spring 4a is larger.

That is, the larger the contact pressure of the contact, the more stable the electrical contact state between the contacts 5 and the longer the life.

However, since the movable spring 4a is pressed by the other end of the armature 3, the contact pressure of the contact point goes back to the distance between the iron core head 1a and one end of the armature 3, that is, the variation of the armature path L. It depends. In addition, the armature 3 is pivotally supported by the hinge 2b of the yoke 2 to rotate.

Therefore, the armature path L is affected by the variation in the height difference H between the iron core head 1a and the hinge portion 2b of the yoke 2, and it is desired that the height difference H be adjusted to a range of ± 0.02 mm. .

Conventionally, the adjustment of the height difference H is performed, for example, by finishing the components in advance with a high processing accuracy or during the assembly process.
And the hinge portion 2b of the yoke 2 is crushed by, for example, a press.

However, since the core head 1a and the hinge portion 2b are displaced and the buckling occurs frequently unlike the case where the distance between the opposing surfaces is adjusted, the adjustment of the height difference H is very troublesome.

[Problems to be solved by the invention]

As described above, the variation in the contact pressure related to the life of the electromagnetic relay is greatly affected by the variation in the distance between the iron core head and the armature, that is, the distance of the armature path L.

Conventionally, in order to suppress the variation of the armature path L, it is necessary to raise the processing accuracy of each component or to crush the iron core head and the hinge part of the yoke, and to adjust the height between the iron core head and the hinge part of the yoke. He said he would adjust the difference H.

However, for example, increasing the processing accuracy of the sheet metal processing of the yoke has a problem in that the manufacturing cost becomes abnormally high.

On the other hand, the height difference H
The method of adjusting the temperature has a problem in that buckling occurs frequently in the iron core and the yoke, resulting in a failure.

Therefore, an object of the present invention is to provide an electromagnetic relay made of an iron core that does not buckle even if the height of the iron core head is adjusted by crushing during the assembly process.

[Means for solving the problem]

The above-described subject has an iron core and a yoke, and the iron core is made of a magnetic material that generates a magnetic field, and has an iron core head at one end and a coil wound around an intermediate part. The other end has a core bottom surface. The core has a support protrusion and a radial or concentric adjustment protrusion on the core bottom surface, and the yoke has a substantially L-shaped magnet in side view. A core having a hole at one end and a hinge at the other end, wherein the iron core is inserted into the hole of the yoke in a substantially U-shape in side view. In addition, the problem is solved by an electromagnetic relay configured such that the adjustment protrusion is crushed so that the height difference between the iron core head and the hinge part can be adjusted.

(Operation)

If the core head or yoke is crushed to adjust the height difference H between the core head and the yoke hinge corresponding to the armature path L of the electromagnetic relay, buckling may occur conventionally. In contrast to this, in the present invention, buckling does not occur even when the iron core head is pressed.

That is, in the present invention, the adjustment protrusions are provided radially or concentrically on the bottom surface of the iron core, separately from the support protrusions inserted into the holes of the yoke.

This adjustment projection is what should be called a crushing allowance (a margin). The shape of the adjustment projection is determined by the size of the iron core, the pressing force,
The height difference is determined as appropriate. And in any case, in a state where the adjustment protrusion is not crushed,
The iron core head is located within the range of the height difference H.

When adjusting the height difference H, when the support protrusion is inserted into the yoke 2 and the iron core head is pressed, the adjustment protrusion is crushed moderately so that a predetermined height difference H is obtained. Then, when the predetermined height difference H is reached, for example, the tip of the support protrusion is crushed and pushed open so that the core and the yoke are inserted.

In this case, even if the iron core head is pressed to adjust the height difference H, the adjusting projections which are the crushing allowances are crushed and an abnormal compressive force is not applied to the iron core itself, so that the iron core never buckles. In addition, the height difference H can be finely adjusted.

〔Example〕

FIG. 1 is a partially cutaway side view showing one embodiment of the present invention;
FIG. 2 is an enlarged bottom perspective view of the main part of FIG. 1, and FIG. 3 is an enlarged bottom perspective view of the main part showing another embodiment of the present invention.

In the figure, 1 is an iron core, 1a is an iron head, 1b is a coil, 1c is a bottom of the iron core, 2 is a yoke, 2a is a hole, 2b is a hinge portion, 11 is a support projection, and 12 is an adjustment projection.

The iron core 1 is, for example, a rod made of a magnetic material having a diameter of 3 mm or 6 mm, and has a core head 1 a at one end and a coil wound at an intermediate portion.
1b and an iron core bottom surface 1c at the other end.

A support protrusion 11 for inserting the iron core 1 into the yoke 2 and an adjusting protrusion 12 having, for example, a triangular cross section are provided on the core bottom surface 1c.

The yoke 2 has, for example, an L-shape in a side view and is made of a magnetic rod or plate, and has a hole 2a at one end.
A support protrusion 11 provided on the iron core bottom surface 1c is inserted into the hole 2a so as to be substantially U-shaped when viewed from the side. The other end is a hinge portion 2b provided with a hinge.

An armature (not shown) is pivotally supported by the hinge portion 2b of the yoke 2 so as to be rotatable, and one end of the armature approaches and retreats from the iron core head 1a.

In FIG. 2, for example, a height of 0.1 m
m adjustment projections 12 are provided concentrically.

When the support protrusion 11 is inserted into the hole 2a of the yoke 2 and the adjustment protrusion 12 abuts on the yoke 2, first, a height difference H between the iron core head 1a and the hinge portion 2b of the yoke 2 is measured. Next, the iron core head 1a is pressed by, for example, an air press so as to fall within the range of the predetermined height difference H.

Then, since the adjustment protrusion 12 is appropriately crushed, a predetermined height difference H can be obtained.

In this state, if the tip of the support projection 11 is pushed open, the adjustment projection 12 appropriately crushed is interposed between the iron core 1 and the yoke 2 like a spacer, and the height difference H is set within a predetermined range and fixed. You.

In FIG. 3, for example, a height of 0.1 m
Three adjustment protrusions 12 of m are protruded radially.

The manner of inserting the iron core 1 and the yoke 2 and adjusting the height difference H is the same as that of the concentric adjustment protrusion 12 described with reference to FIG.

Thus, the core head 1a and the yoke 2 are prevented from being buckled due to abnormal pressure being applied to the core 1 itself.
The height difference H with respect to the hinge portion 2b can be adjusted to a predetermined value.

The same effect can be obtained even if the adjusting projection is not continuous annular or linear, but has a mountain shape scattered intermittently.

The height of the adjustment protrusion is set so that the core head is located higher than the hinge portion of the yoke in a state where the core is not crushed, and the core head always enters a predetermined height difference H in the state where the core is crushed. .

However, various modifications can be made to the shape and arrangement of the adjustment projections due to, for example, the buckling strength due to the size of the iron core, the pressing force of the pressing means, the crushing allowance, and the like.

〔The invention's effect〕

As described above, the adjustment of the height difference between the iron core head and the hinge portion of the yoke, which is performed to adjust the contact pressure to a predetermined value, is conventionally performed by increasing the processing accuracy even if the cost increases. In contrast, the electromagnetic relay according to the present invention, on the other hand, was performed by forcibly pressing the iron core head or the hinge portion.
A fine adjustment projection is provided on the bottom surface of the iron core as a crushing allowance for height adjustment.

With this adjustment projection, not only can the subtle height difference be adjusted, but also there is no abnormal pressing on the iron core itself, so that there is no buckling of the iron core and, of course, the hinge portion is not touched at all.

Therefore, the present invention largely contributes to the efficiency of the manufacturing process of the electromagnetic relay and the improvement of the manufacturing yield.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing one embodiment of the present invention, FIG. 2 is an enlarged bottom perspective view of a main part of FIG. 1, and FIG. 3 is a main part showing another embodiment of the present invention. FIG. 4 is an enlarged bottom perspective view of FIG. 4, and FIG. In the figure, 1 is an iron core, 1a is an iron head, 1b is a coil, 1c is a bottom of the iron core, 11 is a support protrusion, 12 is an adjustment protrusion, 2 is a yoke, 2a is a hole, and 2b is a hinge.

Claims (1)

(57) [Claims] An iron core (1) and a yoke (2), wherein the iron core (1) is made of a magnetic material that generates a magnetic field, and has an iron core head (1a) at one end. A coil (1b) wound around an intermediate portion, and a core bottom surface (1c) at the other end portion. The core (1) has a support projection (1) on the core bottom surface (1c).
1) and a radial or concentric adjusting protrusion (12). The yoke (2) is made of a magnetic material having a substantially L shape in a side view, and has a hole (2a) at one end. ) And a hinge portion (2b) at the other end thereof. The iron core (1) is such that the support protrusion (11) is substantially U-shaped when viewed from the side thereof in the hole (2a) of the yoke (2). When inserted into
An electromagnetic relay, wherein the adjustment protrusion (12) is crushed so as to adjust a height difference between the iron core head (1a) and the hinge part (2b).