JPH10256032A - Electromagnet device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the fixing state by caulking a core and a yoke. SOLUTION: In this electromagnet device 12, a coil 16 is wound between the flange parts on both ends of a spool 15 having a core 14 inside, and an almost U-shaped caulking part 21, formed on one end of a yoke 17, is fixed by caulking on one end of the core 14 projecting from one flange 15a. A press part 18 is formed on one end of the core 14, and the positional deviation to the plate thickness direction of the yoke 17 is prevented by the press part 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet device,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet device having a displacement prevention structure for a yoke fixed to an iron core.

[0002]

2. Description of the Related Art Conventionally, as an electromagnet device, for example, FIG.
As shown in FIG. 2, there is a type in which a yoke 4 is caulked and fixed to an iron core 3 protruding from one flange portion 2 of a spool 1. The swaged portion of the yoke 4 is formed in a U-shape, and is swaged from the side so as to hold the iron core 3. This is because when the opposite side of the spool 1 is formed of resin or when a complicated structure is employed, the caulking operation in the plate thickness direction (axial direction of the iron core 3) is impossible.

[0003]

However, in the conventional electromagnet apparatus, the yoke 4 is caulked and fixed from the side, and the position in the thickness direction (axial direction of the iron core 3) orthogonal to the caulking direction. Since the regulation cannot be performed, there is a problem that the yoke 4 is displaced in the plate thickness direction when an impact force acts, for example, when the yoke 4 is dropped by mistake. The yoke 4 has a function of adsorbing a movable iron piece (not shown), and the above-described positional shift causes deterioration of the operation characteristics.

[0004] Therefore, an object of the present invention is to provide an electromagnet device capable of stabilizing a fixed state of caulking between an iron core and a yoke.

[0005]

In order to achieve the above object, according to the present invention, a coil is wound between both end flanges of a spool having an iron core therein, and an end of the iron core protruding from one of the flanges. In the electromagnet device, a substantially U-shaped caulking portion formed at one end of the yoke is caulked and fixed, and a holding portion is formed at one end of the core, and the holding portion allows the yoke to move along the axis of the iron core. This is to prevent displacement in the direction.

According to this configuration, when the impact force acts, the yoke is prevented from being displaced in the axial direction of the iron core by the pressing portion.

The pressing portion may be formed by forming the core into a plate shape and bending the end of the core at a substantially right angle in the plate thickness direction. In this case, if the iron core is bent in the plate thickness direction, the pressing portion can be formed easily and with high precision.

Further, the pressing portion may be formed by forming the iron core into a rod shape having a circular cross section, and forming the end portion of the iron core into a flange shape.

Preferably, a plurality of protrusions are formed on the end face of the flange of the spool. The protrusion may be constituted by a plurality of protrusions formed so as to be crushed by deformation when the caulking portion is crimped, or may be constituted by protrusions formed in a plurality of rows.

According to this configuration, the core is held between the pressing portion of the iron core and the protrusion formed on the end face of the flange portion of the spool (the flange portion when crushed), and is accurately positioned.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of an electromagnetic relay to which the electromagnet device according to the present invention is applied. This electromagnetic relay is provided with an electromagnet device 12 and a contact opening / closing mechanism 13 on a base 11.

As shown in FIG. 2, a coil 16 is wound around a spool 15 having an iron core 14 and a yoke 17 is fixed to one end of the iron core 14 by caulking.

The iron core 14 has a plate shape. A pressing portion 18 is formed at one end of the iron core 14 by being bent at a substantially right angle in a direction (plate thickness direction) orthogonal to the axial direction. The bending direction of the holding portion 18 is not necessarily limited to the thickness direction, and may be a direction perpendicular to the thickness direction. However, bending in the thickness direction is easier to process and can be formed with high precision. At the other end of the iron core, a suction portion 19 bent in a direction perpendicular to the thickness direction is formed.
The pressing part 18 and the suction part 19 are formed simultaneously when the iron core 14 is pressed into a plate shape.

The spool 15 has flanges 15a, 15b at both ends.
have. The flange portions 15a and 15b are connected to each other by connecting portions (not shown) along both sides of the iron core 14. A pair of coil terminals 20a and 20b are press-fitted and integrated with one flange portion 15a, and a suction portion 19 of the iron core 14 protrudes from a side surface. A pressing portion 18 of the iron core 14 protrudes from an end face of the other flange portion 15b, and a gap h1 having a predetermined dimension is formed between the two.

The coil 16 is provided with a flange 15 of the spool 15.
a and 15b. Both ends of the coil 16 are wound around the coil terminals 20a and 20b, respectively.

The yoke 17 has a substantially L-shaped cross section. A substantially U-shaped caulking portion 21 is formed at one end by a cutout groove 21a, and the other end is a suction portion 22. The interval h2 between the notched grooves 21a of the caulking portion 21 is substantially the same as the plate thickness of the iron core 14. The thickness of the caulked portion 21 is the same as that of the iron core 1.
4, a gap h formed between the holding portion 18 and the flange portion 15a.
It is almost the same as 1.

The electromagnet device 12 is formed as follows.

That is, the pressing portion 18 and the suction portion 19 are formed in the iron core 14 by press working in advance. Then, the iron core 14 is insert-molded to form the spool 15. Next, the coil terminals 20a and 20b are pressed into the flange 15a of the spool 15. At this time, when winding the coil 16, a part of the coil terminals 20a and 20b is bent so as not to hinder the automatic winding. After the coil 16 is wound between the flange portions 15a and 15b, both ends of the coil 16 are wound around part of the coil terminals 20a and 20b, respectively, to return to the original position. The yoke 17 presses the caulked portion 21 from the side into a gap h1 formed between the pressing portion 18 of the iron core 14 and the flange portion 15a. Then, the caulked portion 21 of the yoke 17 is caulked from the side and fixed. The yoke 17 is sandwiched between the upper and lower surfaces of the caulking portion 21 by the pressing portion 18 of the iron core 14 and the flange portion 15a of the spool 15, and is displaced in the thickness direction even if an impact force is applied. There is no.

The contact opening / closing mechanism 13 is, as shown in FIG.
Fixed contact piece 23 and movable contact piece 24 facing each other at a predetermined interval
And a movable iron piece 26 that drives the movable contact piece 24 via a card 25. A fixed contact 23a and a movable contact 24a are integrated with the upper ends of the contact pieces 23 and 24, respectively. The movable iron piece 26 is disposed so as to be rotatable around a lower end portion of the iron core 14 located near the suction portion 19. When the electromagnet device 12 is excited, the movable iron piece 26 is attracted at its upper end by the suction part 22 of the yoke 17 and rotates around the lower end.

In the electromagnetic relay having the above structure, the electromagnetic device 1
2 is excited, the movable iron piece 26 is pulled into the suction portion 22 of the yoke 17.
And rotate around the lower end. And iron core 1
4. A magnetic circuit is formed by the yoke 17 and the movable iron piece 26. The pressing portion 18 of the iron core 14 is in contact with the upper surface of the caulking portion 21 of the yoke 17, and a predetermined contact area is maintained. Therefore, the magnetic resistance does not increase in this portion, and an appropriate magnetic flux density can be maintained. Further, with the rotation of the movable iron piece 26, the movable contact piece 24 is driven via the card 25, and the movable contact 24a comes into contact with the fixed contact 23a. Next, when the electromagnet device 12 is demagnetized, the movable contact piece 24 returns to the original position by the spring force. Further, the movable iron piece 26 rotates to the original position via the card 25 by the return operation of the movable contact piece.

In the above-described embodiment, the iron core 14 is formed in a plate shape, and the pressing portion 18 is formed by bending the tip thereof. However, as shown in FIG. 3, the iron core 14 is formed in a rod shape having a circular cross section. A flange-shaped pressing portion 18 may be formed at the tip. The holding portion 18
Can be easily produced by pressing.

According to this configuration, the caulked portion 2 of the yoke 17
1 is a core 14 having a circular cross section,
Can be assembled smoothly. Moreover, iron core 14
After caulking and fixing the yoke 17 to the
b guides a wide range evenly. In particular, since the pressing portion 18 of the caulking portion 21 of the yoke 17 also comes into contact with the upper surface on the suction portion 22 side, the yoke 17 moves in the direction of the arrow in FIG. Even if it is attempted, the movement can be effectively prevented.

A plurality of protrusions may be formed on the flange 15b of the spool 15. The protrusion is
When the caulking portion 21 of the yoke 17 is caulked, the caulked portion 21 is crushed by deformation in the thickness direction. Thereby, the caulked portion 21 is brought into contact with the end face of the flange portion 15b, and the positional accuracy can be improved.

Further, a plurality of ridges having a cross-sectional waveform may be formed instead of the protrusions. The ridge is a flange 15
By reinforcing a to make it difficult to deform and increasing the positional accuracy of the distal end portion, the caulked portion 21 of the yoke 17 can be accurately positioned. In this case, it is preferable to set the gap between the flange 15a of the iron core 14 and the ridge in consideration of the amount of deformation of the caulked portion 21 at the time of caulking.

[0026]

As is apparent from the above description, according to the electromagnet apparatus of the present invention, since the holding portion is formed at one end of the iron core, the yoke to be swaged is fixed in the axial direction of the iron core. Position can be reliably prevented. Therefore, even when an impact force or the like is applied, the yoke does not deviate in position and product characteristics can be reliably maintained.

Further, since the iron core is formed in a plate shape, and the end portion of the iron core is bent at a substantially right angle in the thickness direction to form the holding portion, processing is easy, and the iron core and the yoke can be formed easily. Can be increased. Therefore, it is possible to form a good caulked fixed state while suppressing the magnetic resistance to a small value.

Further, the iron core is shaped like a rod having a circular cross section,
Since the holding portion is formed by forming the end of the iron core into a flange shape, the contact area between the iron core and the yoke can be increased as described above, and the swaged portion of the yoke is inserted. Cheap. In addition, the range in which the yoke is held down by the holding portion is wide, and a stable caulking fixed state can be realized.

Further, since a plurality of projections are formed on the flange portion of the spool, the yoke can be caulked and fixed at an accurate position. Therefore, variations in operating characteristics among the electromagnet devices hardly occur.

[Brief description of the drawings]

FIG. 1 is a front view of an electromagnetic relay to which an electromagnet device according to the present invention is applied.

FIG. 2 is an exploded perspective view (a) and an assembled perspective view (b) showing a caulked portion of an iron core and a yoke of the electromagnet device of FIG.

FIG. 3 is a partially exploded perspective view (a) and a partially assembled perspective view (b) showing a caulked portion of an iron core and a yoke of another electromagnet device.

FIG. 4 is a partially exploded perspective view (a) and a partially assembled perspective view (b) showing a caulked portion of an iron core and a yoke of an electromagnet device according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Electromagnet apparatus 14 Iron core 15 Spool 15a Flange part 16 Coil 17 Yoke 21 Caulking part 21a Notch groove

Claims (4)

[Claims] 1. A substantially U-shaped caulking formed at one end of a yoke at an end of a core protruding from one of the flanges by winding a coil between both end flanges of a spool having an iron core therein. An electromagnet apparatus comprising: an electromagnet device having a crimped portion, wherein a pressing portion is formed at one end of the iron core, and the pressing portion prevents the yoke from being displaced in the axial direction of the iron core. apparatus. 2. The electromagnet device according to claim 1, wherein the iron core is formed in a plate shape, and the holding portion is formed by bending an end of the iron core at a substantially right angle in a plate thickness direction. 3. The electromagnet device according to claim 1, wherein the pressing portion is formed by forming the core in a rod shape having a circular cross section, and by forming an end of the core in a flange shape. 4. The electromagnet device according to claim 1, wherein a plurality of protrusions are formed on an end face of the flange of the spool.