JP2556394Y2 - 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 an electromagnetic relay, and more particularly, to an electromagnetic relay having an improved coil assembly.

[0002]

2. Description of the Related Art Conventionally, this type of electromagnetic relay has a coil assembly in which a coil winding, an iron core, and a yoke are mounted on a coil bobbin and a contact spring driving body is held, and a contact for press-fitting and fixing the coil assembly. It is constituted by providing spring assemblies and covering them with a cover.

FIG. 5 is an exploded perspective view of an electromagnetic relay showing an example of the related art. As shown in FIG. 5, the conventional electromagnetic relay includes a coil assembly 12 for holding a magnetic pole plate 16, a permanent magnet 17, and a contact spring driver 18, a contact spring assembly 19,
And a cover 24. Of these, coil assembly 1
Reference numeral 2 denotes a coil bobbin 1 having a first flange 2A on which an L-shaped holding portion 7 is formed and a second flange 2B on which a coil terminal 10 is implanted, and a coil winding 4 wound around the center of the coil bobbin 1. , A core 5 penetrating the center of the coil bobbin 1, and a yoke 6 arranged on the lower surface of the coil bobbin 1. The lead wire 8 of the coil winding 4 is wound around the coil terminal 10, and an insulating material is injection-molded from above the coil winding 4 or an insulating tape 15 is applied. In addition, the coil assembly 12 includes a contact spring 21
The contact spring terminal 22 and the contact terminal 23 to which are connected are fitted and joined to a contact spring assembly 19 implanted in the insulating block 20. The contact spring 21 of the contact spring assembly 19 includes a permanent magnet 17 and two magnetic pole plates 16 and is driven by a contact spring driver 18 held by the L-shaped holder 7 projecting from the flange 2A of the coil bobbin 1 described above. Driven.

FIG. 6 is an enlarged front view of a lead wire portion of the coil assembly shown in FIG. As shown in FIG. 6, the state before the insulating material is formed on the coil winding 4 is shown here, and the lead wire 8 is wound around the coil terminal 8 along the coil bobbin 1 on which the coil terminal 10 is implanted. . Thereafter, the injection molding of the insulating material is performed so as to cover the coil wire 4 and the lead wire 8 wound around the coil terminal 10.

[0005]

The above-mentioned conventional electromagnetic relay is performed by injection-molding an insulating material outside a coil winding when forming a coil assembly. In this case, the lead wire of the coil winding moves in the flow direction of the insulating material,
Since it is easily exposed to the outside, there is a disadvantage that the coil winding is disconnected due to resin pressure during injection molding. In addition, the coil assembly of such an electromagnetic relay has the disadvantage that the withstand voltage between the input and output is reduced because the coil lead wire is in direct contact with the terminal holding portion of the coil bobbin, and the insulation performance is significantly reduced.

An object of the present invention is to provide an electromagnetic relay which prevents disconnection of a coil winding forming a coil assembly and improves insulation performance.

[0007]

The electromagnetic relay according to the present invention is:
A coil bobbin having a first outer flange formed with an L-shaped holding portion and a coil terminal and having a second outer flange formed on a side opposite to the first outer flange, and wound around a center of the coil bobbin; And a coil wound around both ends of the coil terminal, an insulating coating covering the outer periphery of the coil winding and the coil terminal, an iron core passing through the center of the coil bobbin, and one end of the iron core, A coil assembly having a yoke disposed on a lower surface of the coil bobbin, the coil assembly holding an inner flange formed inside the second outer flange and a lead wire of the coil winding; For this purpose, a plate-shaped portion for connecting between the second outer flange and the inner flange is formed.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIGS. 1A and 1B are a perspective view of a coil assembly in an electromagnetic relay before and after injection molding, respectively, for explaining a first embodiment of the present invention. As shown in FIG. 1A, the present embodiment is different from the conventional example of FIG. 5 in that the coil assembly 12 is different, and the other components are the same. Therefore, the structure of the coil assembly 12 will be described below. First, the coil assembly 1
Reference numeral 2 denotes a coil bobbin 1 having a first outer flange 2A, a second outer flange 2B, and an inner flange 3, a coil winding 4 wound around the center of the coil bobbin 1, and a center of the coil bobbin 1. It has a core 5 and a yoke 6 fitted to one end of the core 5 and arranged on the lower surface of the coil bobbin 1. Further, an L-shaped holding portion 7 is formed on the outer flange 2A of the coil bobbin 1 constituting the coil assembly 12, as in the conventional example, and coil terminals 10 are implanted on both sides of the outer flange 2B. Moreover, a plate-like portion 9 is provided between the outer flange 2B and the inner flange 3. Therefore, when the lead wires 8 at both ends of the coil winding 4 are wound around the coil terminal 10, the lead wires 8 are supported by the plate-like portions 9. Next, as shown in FIG. 1 (b), the periphery of the coil winding 4 and the upper portions of the outer flange 2 </ b> B, the inner flange 3, and the coil terminal 10 are covered with the insulating coating 11 in the injection molding of the insulating material. As described above, the insulating coating 11 is formed on the outer periphery of the coil assembly 12 by injection molding.
Covers the coil terminal 10 and the plate-shaped portion 9, so that the lead wire 8 supported by the plate-shaped portion 9 does not move in the flow direction of the insulating material due to the injection molding of the insulating material. That is, exposure of the lead wire 8 can be prevented, and disconnection can be prevented.

FIG. 2 is an enlarged front view of a lead wire portion of the coil assembly shown in FIG. As shown in FIG. 2, a plate-like portion 9 arranged on a coil bobbin 1 forming a coil assembly
Forms a hollow portion 13 between the outer flange 2B and the inner flange 3. The hollow 13 improves the withstand voltage.

FIG. 3 is a perspective view of a coil assembly in an electromagnetic relay before injection molding for explaining a second embodiment of the present invention. As shown in FIG. 3, in the present embodiment, a projection 14 is formed on the plate-like portion 9 in addition to the first embodiment described above. By forming the projections 14, the lead wire 8 can be drawn to the coil terminal 10. Therefore, even if the lead wire 8 is subjected to the injection molding of the insulating material, the lead wire 8 does not move in the flow direction of the insulating material, thereby preventing the lead wire 8 from being exposed and the disconnection. Note that the state in which the insulating film 11 is formed on the coil winding 4 by injection molding is shown in FIG.
Since it is the same as (b), it is omitted.

FIG. 4 is an enlarged front view of a lead wire portion of the coil assembly shown in FIG. As shown in FIG. 4, in this case, the projection 14 is formed on the plate-like portion 9 and the hollow portion 1 is formed.
3 is formed in the same manner as in the first embodiment. Therefore, disconnection of the lead wire 8 can be prevented, and the withstand voltage can be improved.

[0013]

As described above, the electromagnetic relay of the present invention supports the inner flange and the lead wire of the coil winding on the coil bobbin on which the coil terminal is implanted and the coil winding is mounted to form a coil assembly. By forming the plate-shaped portion, the lead wire can be held even with the resin pressure at the time of injection molding, so that there is an effect that disconnection of the coil winding can be prevented. In addition, according to the present invention, the creepage distance can be increased by providing a plate-shaped portion in the coil assembly without changing the structure of the contact spring assembly, so that the insulation performance can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a coil assembly in an electromagnetic relay before and after injection molding for explaining a first embodiment of the present invention;

FIG. 2 is an enlarged front view of a lead wire portion of the coil assembly shown in FIG.

FIG. 3 is a perspective view of a coil assembly in an electromagnetic relay before injection molding for explaining a second embodiment of the present invention;

FIG. 4 is an enlarged front view of a lead wire portion of the coil assembly shown in FIG. 3;

FIG. 5 is an exploded perspective view of an electromagnetic relay showing an example of the related art.

FIG. 6 is an enlarged front view of a lead wire portion of the coil assembly shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coil bobbin 2A, 2B Outer flange 3 Inner flange 4 Coil winding 5 Iron core 6 Yoke 7 L-shaped holding part 8 Lead wire 9 Plate part 10 Coil terminal 11 Insulating coating 12 Coil assembly 13 Cut-out part 14 Projection 16 Magnetic pole plate 17 Permanent Magnet 18 Contact spring driver 19 Contact spring assembly 20 Insulation block 21 Contact spring 22 Contact spring terminal 23 Contact terminal

Claims (3)

(57) [Scope of request for utility model registration] A coil bobbin having a first outer flange on which an L-shaped holding portion is formed and a coil terminal implanted and having a second outer flange formed on a side opposite to the first outer flange; and the coil bobbin. A coil wound around the center of the coil and both ends of which are wound around the coil terminal; an insulating coating covering the outer periphery of the coil winding and the coil terminal; an iron core penetrating the center of the coil bobbin; A coil assembly having a yoke coupled to one end and disposed on a lower surface of the coil bobbin, the coil assembly including an inner flange formed inside the second outer flange; An electromagnetic relay, comprising: a plate-like portion that connects the second outer flange and the inner flange to hold a lead wire. 2. The electromagnetic relay according to claim 1, wherein the plate-shaped portion of the coil assembly has a projection formed on an upper surface. 3. The electromagnetic relay according to claim 1, wherein the plate-shaped portion of the coil assembly has a hollow portion formed on a lower surface.