JPH0633635Y2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] In this invention, a pair of fixed terminal pieces having contacts arranged to face each other are fixed to an insulator, and a movable contact piece is brought into contact with and separated from each contact. It relates to an electromagnetic relay.

[Prior Art and its Problems] An example of an electromagnetic relay of this type will be described with reference to FIG. In the figure, the upper collar portion 2 of the coil spool 1 is shown.
In arranging the contacts 13, 13 of the pair of fixed terminal pieces 35, 35 so as to face each other, a pair of insulators 20, 20 for supporting the terminals are integrally formed at both ends of the collar portion 2, It is known that the contact portions 36 are press-fitted into the terminal grooves 21 formed in each of the insulators 20 (see, for example, Japanese Patent Publication No. 55-30647).

However, according to the above configuration, as shown in FIG. 6, since the contact portions 36, 36 are fixed to the insulators 20, 20, respectively, the fixed terminal piece 35 is formed by the wall thickness D1 of the insulator 20. , 3
The contact interval H1 of 5 is regulated. Since the contact distance H1 cannot be set to a value equal to or less than a certain value in order to obtain the withstand voltage, the wall thickness D1 of the insulator 20 also increases. Therefore, the thickness of the insulator 20 is increased, and there is a drawback that it is not suitable for using a thin electromagnetic relay.

Moreover, if the contact distance H1 is to be changed according to the application of the electromagnetic relay, it is necessary to change the wall thickness D1 of the insulator 20 and the distance between the terminal grooves 21, 21. Therefore, it is necessary to prepare a plurality of types of coil spools 1 having the insulators 20 having different wall thicknesses, which has a drawback of increasing the manufacturing cost.

Conventionally, as means for improving this, the insulators 20 and 20 which are separated and opposed to each other are integrally formed on the collar portion 2 of the coil spool 1, and the contact portion 36 of one fixed terminal piece 35 is insulated by the above-mentioned insulation. It is pressed against the upper surface of the body 20,20 and the other fixed terminal piece 35
The contact portion 36 is pressed against the lower surfaces of the insulators 20 and 20, and the L-shaped corner portions of the fixed terminal pieces 35 and 35 and the L-shaped projections protruding from the corner portions ( It is known that (not shown) is pressed into the grooves formed in the insulators 20 and 20 (see Japanese Utility Model Laid-Open No. 57-119443).

However, according to the above configuration, since the corner portions and the protrusions of the fixed terminal pieces 35, 35 are press-fitted into the grooves of the insulators 20, 20, the press-fitting area is wide and the press-fitting resistance is large. Poor manufacturing and assembly.

In addition, most of the fixed terminal pieces 35, 35 are connected to the insulators 20, 20.
Since it is press-fitted into the groove, the coil spool becomes large, which hinders downsizing or thinning of the electromagnetic relay.

Furthermore, according to the above configuration, most of the fixed terminal pieces 35, 35 are press-fitted into the grooves of the insulators 20, 20, so that the contact area is wide and the arc generated between the contacts 13, 13 is large. Most of the heat is transferred to the insulators 20 and 20, and harmful gases that corrode the contact portions 36 and 36 are generated from the insulators 20 and 20 and the collar portion 2a of the coil spool 1 which are made of synthetic resin. , Has a short life.

This is almost the same even if the contact portions 36, 36 of the fixed terminal pieces 35, 35 are bent in the direction away from each other by using the means disclosed in Japanese Utility Model Laid-Open No. 59-214125. There are challenges.

[Purpose of device]

This invention was made to solve the above problems,
It is easy to manufacture and assemble, and can be made smaller or thinner.
The purpose is to provide a long-life electromagnetic relay.

[Constitution and effect of device]

In the electromagnetic relay according to the present invention, the tip end of the protrusion protruding from the corner portion of the fixed terminal piece bent into the L shape is bent into the L shape, and the tip portion is projected onto the coil spool. In addition to being fixed to the outer wall of the insulator, each contact portion of the fixed terminal piece is bent in a direction away from each other at a lateral position of the outer wall of the insulator.

In such a configuration, since the protrusion integrally formed on the fixed terminal piece is fixed to the insulator, the thickness of the insulator may be such that the protrusion can be fixed. It is not necessary to increase the thickness of the insulator. Therefore, it is possible to reduce the thickness of the terminal device by setting the thickness of the insulator smaller than the contact distance.

Further, since the contact portions of the pair of fixed terminal pieces are bent in a direction in which they are separated from each other in a state where they are not fixed to the insulator, the contact spacing can be set to an arbitrary value regardless of the thickness of the insulator. Can be set to. Therefore, it is possible to deal with the change in the contact distance with one type of insulator, and the manufacturing cost of the insulator can be reduced.

Further, according to the above configuration, since most of the fixed terminal pieces are arranged at the lateral positions of the outer wall of the insulator, it is difficult for the arc heat generated between the contacts to be transmitted to the insulator, and the fixed terminal piece is made of synthetic resin. Even with such an insulator, the generation of harmful gas that corrodes the contact portion can be suppressed as much as possible, and the life of the insulator can be extended.

Moreover, according to the above configuration, since the corner portion of each fixed terminal piece is not press-fitted into the insulator, the press-fitted area is small only by the protrusion and the press-fitting resistance is small, so that the manufacturing and assembling property is good.

[Description of Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view showing an example of an electromagnetic relay according to an embodiment of the present invention.

This electromagnetic relay is roughly classified into a base 6 and an electromagnet block.
It is composed of 40, a terminal device 50, and a case 18.

The electromagnet block 40 includes a coil spool 1, a rod-shaped iron core 4, and an L-shaped yoke 3. The coil spool 1 has a central hole made of synthetic resin.
Collar portions 2a and 2b are formed on both sides of a shaft portion 1b having 1a. The iron core 4 is inserted into the center hole 1a of the coil spool 1, and the base end 3a of the yoke 3 is fixed to the lower end of the iron core 4 by caulking or the like. A movable iron piece 5 is cantilevered on the upper end portion 3b of the yoke 3, and the movable iron piece 5 is attracted to the magnetic pole surface 4a of the iron core 4 when an electromagnetic coil (not shown) wound around the coil spool 1 is excited. When demagnetized, the elastic force of the hinge spring 7 separates it from the magnetic pole surface 4a.

A pair of insulators 11, 11 for supporting terminals are integrally formed on both ends of the upper flange portion 2a of the coil spool 1. Each insulator 11 for supporting terminals opened on the outer wall 11a side. Press-fit hole 1
9 are formed respectively.

Reference numeral 16 is a coil terminal, and the terminal piece 16a is fitted in the terminal hole 25 of the base 6.

Next, the terminal device 50 is composed of a movable contact piece 9 having a movable contact 9a at its tip and fixed terminal pieces 12, 12a having contacts 13 arranged opposite to each other at its tip.

The fixed terminal pieces 12 and 12a include 41 at the bases of the contact portions 15 and 15a.
Terminal-fixing protrusions 14, 14 are integrally formed on the respective terminals. As shown in FIG. 2, the protrusion 14 is bent in an L shape and has a press-fitting portion 14a at its tip. Press-fitting part 1 above
4a is press-fitted or insert-molded into the press-fitting hole 19 of the insulator 11, whereby the protrusions 14 are fixed to the insulators 11 and 11, respectively, as shown in FIG.

On the other hand, the contact portions 15 and 15a of the fixed terminal pieces 12 and 12a are not in contact with the insulator 11 and the flange portion 2a of the coil spool 1 and are in directions away from each other as shown in FIG. It has been folded. That is, the one contact portion 15 is bent in a substantially L-shape below the press-fitting portion 14a so that the movable contact 9
The movable contact is disposed at a position lower than a, and the other contact portion 15a is bent in a substantially L shape to the upper side of the press-fitting portion 14a and has a contact distance H2 with the contact portion 15. It is located above 9a.

In the above structure, as shown in FIG. 3, the fixed terminal piece 1
Since only the protrusions 14 integrally formed on the 2, 12a are fixed to the insulator 11, the thickness D2 of the insulator 11 is the above-mentioned protrusion.
It is enough to fix 14 and it is not necessary to increase the wall thickness D1 of the insulator 20 according to the contact distance H1 as in the conventional case. Therefore, set the thickness D2 of the insulator 11 to the contact spacing.
It is possible to make the terminal device thinner by setting it thinner than H2, and it can be optimally used for thin electromagnetic relays.

Further, each of the contact portions 15 and 15a is configured to be bent in a direction in which they are separated from each other in a state where they are not fixed to the insulators 11 and 11, so that the contact distance H2 is set regardless of the wall thickness D2 of the insulator 11. It can be set to any value. Therefore, it is possible to deal with the change of the contact distance H2 without changing the thickness of the insulator 11, and the manufacturing cost of the coil spool 1 having the insulator 11 can be reduced.

Further, since the contact portions 15 and 15a have no portions that respectively contact the insulator 11 and the flange portion 2a of the coil spool 1,
The arc heat generated between the contacts 13, 13 becomes difficult to be transferred to the insulator 11 and the coil spool 1. Therefore, even when the insulator 11 and the coil spool 1 made of synthetic resin are used, contact corrosion gas is prevented from being generated from the insulator 11 and the coil spool 1 due to the arc heat as much as possible. It is possible to eliminate the adverse effect on the contact points 15, 15a.

Moreover, according to the above configuration, since the corner portions of the fixed terminal pieces 12 and 12a are not press-fitted into the insulators 11 and 12a, the press-fitting area is small only in the press-fitting portion 14a at the tip of the protrusion 14, and the press-fitting area is small. Since the resistance is small, the manufacturing and assembling property is good.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an example of an electromagnetic relay according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a fixed terminal piece and an insulator, and FIG. 3 is a perspective view near a contact portion of the fixed terminal piece. , 4th
The drawing is a view taken along the line IV-IV in FIG. 3, FIG. 5 is a perspective view showing an example when applied to a conventional electromagnetic relay, and FIG. 6 is an enlarged view of the vicinity of the contact portion shown in FIG. FIG. 1 ... Coil spool, 11a ... Outer wall, 14a ... Tip of protrusion (press-fitting portion), 9 ... Movable contact piece, 11 ... Insulator,
12,12a …… Fixed terminal piece, 13 …… Contact, 14 …… Protrusion, 15,1
5a ... contact part, 50 ... terminal device.

Claims (1)

[Scope of utility model registration request] 1. A pair of L-shaped fixed terminal pieces each having a contact point disposed opposite to each other at their tip portions are fixed to an insulator protruding from a coil spool and wound around the coil spool. In an electromagnetic relay provided with a movable contact piece that comes into contact with and separates from each of the contacts by excitation of an electromagnetic coil, a tip of a protrusion protruding from an L-shaped corner of the fixed terminal piece is L-shaped. And the tip of the fixed terminal piece is fixed to the outer wall of the insulator, and the contact portions of the fixed terminal piece are bent in the lateral direction of the outer wall of the insulator so as to be separated from each other. An electromagnetic relay characterized by.