JP2002141220A - Iron core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent burrs from being produced, when an iron core is integrally molded together with a molding material. SOLUTION: An iron core 10 is equipped with a center piece 1 and opposed pieces 2 and 2, which are counterposed to each other and provided to the center piece 1, extending from the ends of the center piece 1 in the direction vertical to the axial direction of the center piece 1, where at least one of the opposed pieces 2 and 2 is tapered so that its tip becomes thinner than its root, so that the counterposed piece 2 is provided with a inclined outer side surface 2a, forming an angle with the center piece 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an iron core used for an electromagnet such as an electromagnetic relay.

[0002]

2. Description of the Related Art Conventionally, there is an iron core 101 of this type shown in FIGS. This is the central piece 10
1a, two opposing pieces 101b, 101b extending from both ends of the central piece 101a in a direction orthogonal to the axial direction of the central piece 101a and facing each other are formed in a substantially U-shape.

[0003] As shown in Figs. 6 and 7,
The two opposing pieces 101 are provided in the arrangement space 200a inside the mold 200.
b and 101b are inserted and arranged from the tip. The metal mold 200 is provided with two opposing pieces 10 of the inner surface and the iron core 101.
1b, 101b, both opposing pieces 101b, 101b
The installation space 200a is formed a little larger so that a slight gap g is formed from the front end in the extending direction to the extending base, and the two opposing pieces 101b, 101b of the iron core 101 are easily inserted. Like that. And this iron core 101
The two opposing pieces 10 are placed in the arrangement space 200a inside the mold 200.
1b and 101b are arranged and molded together with the resin material, so that the central piece 101b is formed as shown in FIG.
The molded body 102 formed by curing the resin molding material is integrated so as to surround the vicinity of the extension base of the a and the opposing pieces 101b, 101b.

[0004]

The above-mentioned conventional iron core 1
In the case of No. 01, in the state where it is arranged in the arrangement space 200a inside the mold 200, a slight gap g is formed from the leading end in the extending direction of both opposing pieces 101b, 101b to the extending base. For this reason, when the resin molding material enters into the gap g and cures, as shown in FIG. 8, as shown in FIG. Scraps will be formed.

As described above, when the burrs are formed when the iron core 101 is integrally formed with the resin molding material, as shown in FIG. 9, a body formed by integrally forming the iron core 101 and the molded body 102 is formed. When the block 103 is a component of the electromagnetic relay, the molded body 102 of the body block 103 is used.
The bobbin block 104 mounted next to the device may not be mounted as designed due to the burr A, which may hinder assembly of the electromagnetic relay.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide an iron core in which burrs are not easily formed when integrally formed with a molding material.

[0007]

According to a first aspect of the present invention, there is provided an iron core extending from a central piece and both ends of the central piece in a direction perpendicular to the axial direction of the central piece. And at least one of the two opposing pieces is inclined with respect to the central piece from near the extension base to the tip so as to make the tip side thinner. The surface is provided outside.

According to a second aspect of the present invention, in the iron core according to the first aspect, the facing piece provided with the inclined surface is a facing surface facing the other facing piece or a side opposite to the facing surface. The inclined surface is provided on at least one of the opposite surfaces, and an adjacent surface adjacent to the opposing surface is orthogonal to the central piece.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An iron core 10 according to a first embodiment of the present invention.
Will be described below with reference to FIGS. This iron core 1
0 is used for an electromagnetic relay.

Reference numeral 1 denotes a central piece, and both opposing pieces 2 and 2 opposing each other extend in a direction perpendicular to the axial direction from both ends in the axial direction which is the longitudinal direction. Due to the central piece 1 and the opposing pieces 2 and 2, the entire shape of the iron core 10 is substantially U-shaped.

Both of the opposing pieces 2 and 2 extend from the vicinity of the extension base to the tip end, that is, slightly from the tip end to the tip end so as to make the tip end side in the extending direction thinner. An inclined surface 2a inclined with respect to the central piece 1,
2a are provided on four outer surfaces, namely, an opposing surface 2b opposing the other opposing piece 2, an opposing surface 2c opposite to the opposing surface 2b, and an adjacent surface 2d adjacent to the opposing surface 2b.

The iron core 10 has the inclined surfaces 2a, 2a provided on both opposing pieces 2, 2, so that the opposing pieces 2, 2 are inserted into the installation space 100a inside the mold 100 from the tips thereof. 1 and 2, a slight gap G is formed between the inclined surface 2a and the inner surface of the mold 100, as shown in FIGS. Installation space 10
0a is easy to insert.

When the iron core 10 is installed in the installation space 100a inside the mold 100, the two opposing pieces 2, 2 on the base side extending from the inclined surface 2a and the inner surface of the mold 100. There is hardly any gap between them. Accordingly, when the iron core 10 is molded together with the resin material in a state where the two opposing pieces 2 and 2 are disposed in the arrangement space 100a inside the mold 100, the iron core 10 and the two opposing pieces 2 and 2 Between the central piece 1 and the opposed base pieces 2 and 2 without the molding resin material entering between the inner surface of the base material 100 and
The molded body 11 formed by curing the resin molding material is integrated.

In such an iron core 10, the two opposing pieces 2, 2 are inserted into the installation space 100 a inside the mold 100 from the tip so as to be integrally formed with the resin molding material. In this case, a slight angle is formed between the inclined surface 2a provided on the opposed pieces 2 and 2 and the inner surface of the mold 100 from the vicinity of the extension base to the tip so as to make the tip end side thinner. Since the gap G is formed, the disposing space 10 inside the mold 100 is formed such that a gap is formed between the opposing pieces 2 and 2 in the extending direction and the inner surface of the mold 100 from the extending end to the extending base.
0a without increasing the size of the iron core 10,
2 It can be easily inserted from the tip. Also, the mold 10 extends from the leading end of the opposing pieces 2 and 2 in the extending direction to the extending base.
Since there is no need to enlarge the disposing space 100a inside the mold 100 so that a gap is formed between the resin molding material and the inner surface of the mold 100, there is no gap into which the resin molding material enters, and the excess resin molding material hardens. In this case, no forming waste called burrs is formed.

Therefore, the iron core 10 and the molded body 1 of this embodiment
In the case where the body block 30 formed as a single unit is used as a component of the electromagnetic relay, the dimensional accuracy between the molded body 11 of the body block 30 and another block mounted adjacent to the body block 30 may be increased. Therefore, other blocks can be mounted as designed, and the assembly of the electromagnetic relay is not hindered.

Next, an iron core 10 according to a second embodiment of the present invention will be described below with reference to FIGS. In addition, the same code | symbol is attached | subjected to the substantially same part as the iron core 10 of 1st Embodiment, and only the part different from the iron core 10 of 1st Embodiment is described. The iron core 10 of the present embodiment is basically the same as the iron core 10 of the first embodiment, but both of the opposing pieces 2 are opposite to the opposing surface 2 b opposing the other opposing piece 2 and the opposite opposing face 2 b. Face 2
c, the inclined surface 2a is provided only on the center piece 1 without providing the inclined surface 2a on the adjacent surface 2d adjacent to the facing surface 2b.
And orthogonal.

In the iron core 10, in addition to the effects of the first embodiment, both opposing pieces 2, 2 have an opposing surface 2 b opposing the other opposing piece and a side opposite to the opposing surface 2 b. Since the inclined surface 2a is provided only on the opposite surface 2c, the adjacent surface 2d adjacent to the opposing surface 2b is kept perpendicular to the central piece 1, so that the central piece 1 and the two opposing pieces 2 are provided. ,
With the 2 placed on the same surface, the inclined surface 2a can be easily provided on the iron core 10 by, for example, a die cutting process by press working.

However, in this embodiment, since the inclined surface 2a is not provided on the adjacent surface 2d of the opposing piece, the iron core 10
Block 30 formed integrally with the molded body 11
In the case, the burr may be formed at the boundary between the adjacent surface 2d of the opposing pieces 2 and the molded body 11, and when the body block 30 is used as one component of the electromagnetic relay together with the other blocks, It is desired to design such that the mating surface 2d and other blocks do not come into close contact.

Next, an iron core 10 according to a third embodiment of the present invention will be described below with reference to FIG. Note that the same reference numerals are given to substantially the same portions as the iron core 10 of the first embodiment,
Only different points from the iron core 10 of the first embodiment will be described. The iron core 10 of the present embodiment is basically the iron core 1 of the first embodiment.
0, but the opposite surface 2c of the one opposing piece 2 adjacent to the later-described bobbin block 30 and the two adjacent mating surfaces 2d, 2
Only d has an inclined surface 2a.

Next, the iron core 10 and the molded body 11 of this embodiment
An electromagnetic relay will be described in which a body block 30 formed integrally with a component is a component.

The molded body 11 is formed integrally with the iron core 10 so as to surround the central piece 1 and the opposing pieces 2 and 2 of the iron core 10 and to be in close contact with the opposing surfaces 2b of the opposing pieces 2 and 2. In this state, the body block 30 is formed together with the iron core 10. The molded body 11 has a substantially rectangular shape in a plan view, and a substantially flat base 11a surrounding the iron core 10 is provided with a center standing portion 11b substantially at the center, and side standing portions 11c standing on both sides. Have been.

In the molded body 11, a fixed contact 11d and a supporting portion 11e for supporting a hinge spring 14b, which will be described later, by spot welding are provided on the side standing portions 11c, 11c on both sides, respectively. The connected fixed terminal plate 11f and the fixed terminal plate 11g connected to the support portion 11e are integrally formed with the iron core 10. Further, the molded body 11 is provided with a coil terminal 18 described later.
A hole-shaped permanent magnet arranging portion 11j for arranging a permanent magnet 12 to be described later is provided in a base portion 11a.
Are provided on the central standing portion 11b.

Numeral 12 denotes a permanent magnet, which is formed in a substantially rectangular parallelepiped shape, and whose both ends are magnetized to different polarities, and whose one end is an iron core 1.
The molded piece 11 is disposed on the above-described permanent magnet disposing portion 11j so as to be located at the central portion of the central piece 1 of the "0".

Reference numeral 13 denotes an armature made of a magnetic material, and is formed into a substantially rectangular flat plate shape so that both ends in the longitudinal direction of the magnetic pole can face the tip of the opposing piece 2 of the iron core 10 as the magnetic pole. A supported portion (not shown) that is formed and is swingably supported by the permanent magnet 12 so as to perform a seesaw operation is provided at the center of the back surface.

Reference numeral 14 denotes a movable spring, which is formed in a strip shape from a thin plate spring material such as a copper alloy.
4a, and is bent into a U-shape so that the other end is a hinge spring 14b. This hinge spring 14b
Is spot-welded to the above-described support portion 11e of the molded body 11, and is connected to the fixed terminal plate 11g. This movable spring 1
The center part 4 is integrally formed with the center part of the armature 13 so as to be fixed to the integrally formed insulator 15 and is provided side by side substantially parallel to the longitudinal direction of the armature 13. .

Reference numeral 16 denotes a coil bobbin.
A flange 16b is provided at both ends in the axial direction of the winding drum having a through hole 16a.
The coil 17 is wound around the winding drum portion. The coil bobbin 16 has an engagement protrusion 16c for engaging and supporting an insulating plate 19, which will be described later, having one flange portion 16b.
It is provided in. The coil bobbin 16 has a coil terminal 18 connected to the coil 17 integrally formed therewith.
A bobbin block 40 is formed together with the coil 17 and the coil terminal 18. The bobbin block 40 has one of the opposing pieces 2 of the iron core 10 inserted into a through hole 16 a penetrating through the winding drum portion of the coil bobbin 16, and the coil terminal 18.
Is disposed adjacent to the molded body 11 of the body block 30 so as to penetrate the above-described coil through hole 11h of the molded body 11.

Reference numeral 19 denotes an insulating plate, which is formed in a frame shape by a ceiling portion 19b having an opening portion 19a and walls 19c provided around three sides of the ceiling portion 19b, and two wall portions 19c opposed to each other. Is provided with an engagement piece 19e having an engagement hole 19d which is engaged and supported by the engagement protrusion 16c of the coil bobbin 16. The insulating plate 19 is mounted on the coil bobbin 16 so that the engaging projection 16c is engaged with the engaging hole 19d, and the coil 17 and the contacts 11d, 14
a.

Reference numeral 20 denotes a case, which is formed in a box shape having a ceiling, and the ceiling is provided with a through hole 20a communicating with the inside. The case 20 is covered with the molded body 11 so as to surround the above-described members, that is, the armature 13, the movable spring 14, the insulating plate 19 and the like. The case 20 is sealed by closing a through hole 20a provided to communicate with the inside.

Next, the operation will be described. When the coil 17 is energized, the armature 13 is attracted to the tip of one of the opposing pieces 2, which serves as a magnetic pole part, and swings so as to perform a seesaw operation on the permanent magnet 12 according to the direction of magnetization. Spring 1
The movable contact 14a provided at one end of the contact member 4 contacts the fixed contact 11d. Here, when the direction of current supply to the coil 17 is reversed, the armature 13 is attracted to the tip of the other opposing piece 2 which is the other end of the magnetic pole, and swings in the opposite direction, causing the movable contact 14a to open from the fixed contact 11d. Let go. When the power supply to the coil 17 is stopped, the state immediately before the stop is maintained.

This electromagnetic relay is a so-called latching type (magnetic holding type) in which the contacts 11d and 14a contact and separate the coil 17 according to the direction of energization. A so-called single stable type (current holding type) in which the contacts 11d and 14a come and go may be used.

In the iron core 10, like the iron core 10 of the first embodiment, no burr is formed at the boundary between the one opposing piece 2 having the inclined surface 2 a and the molded body 11.
The dimensional accuracy between the body block 30 and the bobbin block 40 in which the molded body 11 is integrally molded can be increased, and the molded body 11 can be mounted as designed, which may hinder assembly of the electromagnetic relay. Is gone.

The iron core 10 of the present embodiment has a configuration in which the inclined surface 2a is provided only on the opposite surface 2c of the one opposing piece 2 adjacent to the bobbin block 30 and on both adjacent surfaces 2d, 2d. For example, when manufacturing is easier when symmetrical, the opposite surface 2c of both opposing pieces 2 and 2 and both adjacent surfaces 2c
An inclined surface 2a may be provided on d and 2d.

[0033]

According to the first aspect of the present invention, in the state where the opposing piece is inserted into the installation space inside the mold from the front end thereof so as to be integrally formed with the resin molding material, the front end is formed. A small gap is formed between the inclined surface provided on the opposing piece and the inner surface of the mold so as to incline from the vicinity of the extension base to the tip end so as to make the side thinner, so that the opposing piece extends The iron core can be easily inserted from the tip of the opposing piece without increasing the space inside the mold so that a gap is formed between the tip in the installation direction and the inner surface of the mold from the extension base. it can.
In addition, since there is no need to increase the disposition space inside the mold so that a gap is formed between the opposing piece and the inner surface of the mold from the distal end in the extending direction to the extension base, the resin molding material is not necessary. There is no gap to enter, and it is difficult to form molding dust called so-called burrs, which is formed by hardening the excess resin molding material.

In the iron core according to the second aspect, in addition to the effect of the iron core according to the first aspect, the opposing piece has an opposing surface opposing the other opposing piece or an opposing surface opposite to the opposing surface. Since the inclined surface is provided only on at least one of the surfaces, and the adjacent surface adjacent to the opposing surface is kept orthogonal to the central piece, the central piece and both opposing pieces are placed on the same surface. In this state, the inclined surface can be easily provided on the iron core by, for example, a die cutting process by press working.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a positional relationship between a first embodiment of the present invention and a mold.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view showing a positional relationship between a second embodiment of the present invention and a mold.

FIG. 4 is a sectional view taken along line XX of FIG. 3;

FIG. 5 is an exploded perspective view of an electromagnetic relay including the third embodiment of the present invention.

FIG. 6 is a sectional view showing a positional relationship between a conventional example and a mold.

FIG. 7 is a sectional view taken along line XX of FIG. 6;

FIG. 8 is a perspective view of a block in which the above is integrally molded with a resin material.

FIG. 9 is an exploded perspective view of an electromagnetic relay including the above.

[Description of Signs] 1 Central piece 2 Opposing piece 2a Inclined surface 2b Opposed surface 2c Opposite surface 2d Adjacent surface 10 Iron core

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shunsuke Egashira 1048 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. F-term (reference) 5E048 AB04 AC05 AC06 AD18

Claims (2)

[Claims] 1. An iron core comprising: a central piece; and two opposing pieces extending from both ends of the central piece in a direction orthogonal to the axial direction of the central piece and facing each other, at least one of the two opposing pieces. The iron core is characterized in that an inclined surface is provided outwardly from the vicinity of the extending base to the distal end so as to be thinner on the distal end side with respect to the central piece. 2. The opposed piece provided with the inclined face, wherein the inclined face is provided on at least one of a facing face facing the other facing piece or an opposite face opposite to the facing face. The iron core according to claim 1, wherein adjacent adjacent surfaces are orthogonal to the central piece.