JPH04106829A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To plan to increase a withstand voltage between a coil and a contact by providing a slot portion in a coil terminal holding section around a coil terminal. CONSTITUTION:A coil assembly provided with a york, a coil bobbin and a contact spring driving body is mounted on a contact spring assembly whose base a fixing terminal and a movable spring terminal interpolated, and the whole body is covered and a slot portion 18 is formed in a part of a coil terminal holding section 7 held by a coil terminal 15. Accordingly the creeping distance from the coil terminal 15 and to a York 6 becomes longer by the depth of the slot 18, and a withstand voltage between the coil terminal 15 and the york is increased. Thereby the withstand voltage between a coil and a contact can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic relay, and particularly to an electromagnetic relay that improves dielectric strength.

[Conventional technology]

Conventionally, this type of electromagnetic relay includes a contact spring assembly, a coil assembly, and a contact spring driver. Further, the dielectric strength voltage, which determines one of the characteristics of such an electromagnetic relay, is determined by the creepage distance from the surface of the coil terminal holder holding the coil terminal to the contact portion.

FIG. 3 is an exploded perspective view of an electromagnetic relay showing an example of such a conventional electromagnetic relay.

As shown in FIG. 3, a conventional electromagnetic relay includes a contact spring assembly 8 in which terminals of a movable contact spring 12 and fixed terminals 11 are implanted in a base 10, an iron core 5 and a yoke on a coil bobbin around which a coil 13 is wound. 6, a contact spring driver 4 fixed to the contact spring assembly 8 and holding the permanent magnet 3 and the two magnetic pole plates 2a and 2b, and the cover 1.
and has. This coil assembly is fixed to a contact spring assembly 8, and also includes a permanent magnet 3 and two magnetic pole plates 2a.

The contact spring driver 4 holding the contact spring assembly 2b is also placed over the contact spring assembly 8 and covered with the cover 1.

Also, the coil bobbin has flanges 14A on both ends.

14B, and a coil terminal holding portion 7 for holding the coil terminal 15 around which the lead wire 16 drawn out from the coil 13 is wound is formed on the side surface. The front flange portion 14A of the coil terminal holding portion 7 has a holding portion 9 that swingably holds the contact spring driver 4. This contact spring driver 4 operates in a direction perpendicular to the axial direction of the iron core 5, so that the coil terminal holding portion 7 is fixed to the base 10 constituting the contact spring assembly 8 via the base fitting hole 17. The movable contact springs 12 located on both sides of the contact springs 12 are displaced to open and close the contacts.

Here, the dielectric strength voltage of the assembled electromagnetic relay is determined by the distance from the surface of the coil terminal holding portion 7 formed on the side surface of the coil bobbin from which the coil terminal 15 protrudes to the contact portion.

[Problem to be solved by the invention]

In the conventional electromagnetic relay described above, since the coil terminal protrudes from the surface of the coil terminal holding portion, the creepage distance between the coil terminal and the yoke is short. Therefore, it is not possible to obtain a high dielectric strength voltage between the coil terminal and the contact, so there is a drawback that the dielectric strength voltage between the coil and the contact cannot be increased.

An object of the present invention is to provide an electromagnetic relay that can improve the dielectric strength between the coil and the contacts.

[Means to solve the problem]

The electromagnetic relay of the present invention includes a contact spring assembly in which a fixed terminal and a movable spring terminal are embedded in a base, a coil assembly in which a yoke, a coil bobbin, and a contact spring driver are mounted, and the entire body is covered with a cover. In this electromagnetic relay, a groove portion along the coil terminal is formed in a part of the coil terminal holding portion through which the coil terminal passes.

〔Example〕

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

FIG. 1 is an enlarged perspective view of a coil terminal holding portion in an electromagnetic relay for explaining a first embodiment of the present invention.

As shown in FIG. 1, the overall configuration of this embodiment is similar to the exploded perspective view of FIG. 3 described above, and only the different parts are shown here.

That is, in this embodiment, in the electromagnetic relay shown in FIG.
A groove portion 18 is formed in a part of the coil terminal holding portion 7 in which the coil terminal 15 is held. As a result, the creepage distance between the coil terminal 15 and the yoke 6 becomes longer by the depth of the groove. Therefore, the dielectric strength between the coil terminal 15 and the yoke 6 is improved, and the dielectric strength between the coil and the contact point is increased.

Note that the other fitting holes 17 and the like of the coil terminal holding portion 7 with respect to the base 10 are the same as in the conventional example.

FIG. 2 is an enlarged perspective view of a coil terminal holding portion in an electromagnetic relay for explaining a second embodiment of the present invention.

As shown in FIG. 2, this embodiment has a large first groove 1 in the groove around the coil terminal 15 in the coil terminal holding part 7
By forming a small second groove 19 and providing a step, the creepage distance can be made longer than in the first embodiment described above. This improves the dielectric strength between the coil terminal 15 and the yoke 6, thereby increasing the dielectric strength between the coil and the contact.

〔Effect of the invention〕

As explained above, in the electromagnetic relay of the present invention, the creepage distance between the coil terminal and the yoke can be increased by providing a groove in the coil terminal holding portion around the coil terminal. This has the effect of improving breakdown voltage.

[Brief explanation of the drawing]

FIG. 1 is an enlarged perspective view of a coil terminal holder in an electromagnetic relay for explaining a first embodiment of the present invention, and FIG. 2 is a coil in an electromagnetic relay for explaining a second embodiment of the present invention. FIG. 3 is an exploded perspective view of an electromagnetic relay showing an example of a conventional electromagnetic relay. DESCRIPTION OF SYMBOLS 1...Cover, 4...Contact spring driver, 6...Yoke, 7...Coil terminal holding part, 8...Contact spring assembly, 10...Base, 12...Movable contact spring , 14A
, 14B...Flange, 15...Coil terminal, 17
...Base fitting hole, 18.19...Groove.

Claims (1)

[Claims] 1. A contact spring assembly in which a fixed terminal and a movable spring terminal are embedded in a base, a coil assembly including a yoke, a coil bobbin, and a contact spring driver is mounted on the contact spring assembly, and the whole is covered with a cover. An electromagnetic relay characterized in that a groove portion along the coil terminal is formed in a part of the coil terminal holding portion through which the coil terminal passes. 2. The electromagnetic relay according to claim 1, wherein a plurality of said groove portions are provided, and further, a step is formed such that the groove portion becomes smaller from the surface of the coil terminal holding portion toward the inside.