JP2002184287A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suitably fix a terminal part in a terminal hole of a base with an adhesive. SOLUTION: A base 12 is provided with press-fitting recess parts 18a, 18b, a terminal hole 19 and an auxiliary terminal hole 20 passing through from the press-fitting recess parts 18a, 18b to a bottom surface. Terminal parts 35, 39 passing through the terminal hole 19 and auxiliary terminal parts 36, 40 provided in the auxiliary terminal hole 20 are formed on press-fitting parts 33, 38 of contact pieces 30, 31 press-fitted in the press-fitting recess parts 18a, 18b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic relay, a terminal portion of a contact piece is press-fitted into a terminal hole formed in a base to protrude from a bottom surface, and an adhesive is injected into the press-fit portion from the bottom side of the base and fixed. There is something that I did.

[0003]

However, in most cases, the protruding position of the terminal portion from the base is laterally shifted from the center because the relation of the printed circuit board to be mounted is taken into consideration. That is, the terminal portion is formed at a position that is unbalanced with respect to the contact opening / closing position. For this reason, when stress acts on the terminal portion due to shrinkage when the adhesive cures, the contact piece is displaced, which may directly adversely affect operating characteristics such as a distance between contacts.

Accordingly, an object of the present invention is to provide an electromagnetic relay capable of properly fixing a terminal portion to a terminal hole of a base with an adhesive.

[0005]

According to the present invention, as a means for solving the above-mentioned problems, there is provided a base having a press-fitting recess formed from an upper surface and a terminal hole penetrating from the press-fitting recess to a lower surface. A press-fit portion to be press-fit into the press-fit recess of the base,
A contact portion extending upward from the press-fit portion and having a contact provided at a tip thereof; and a contact portion extending downward from one side edge of the press-fit portion and penetrating through a terminal hole of the base. In an electromagnetic relay comprising a piece and fixing a terminal portion by injecting an adhesive into a terminal hole from the lower surface side of the base, the contact piece has an auxiliary terminal portion on the other side edge of the press-fit portion. And forming an auxiliary terminal hole through which the auxiliary terminal portion is inserted in the press-fit recess of the base.

According to this configuration, not only the terminal portion but also the auxiliary terminal portion can be fixed to the base by injecting an adhesive into not only the terminal hole but also the auxiliary terminal hole from the lower surface of the base. Therefore, even if the base is made thin, the contact piece can be firmly and well-balanced. It is preferable that at least two terminal holes formed in the base be communicated with a concave portion for injecting the adhesive, since the operation of injecting the adhesive can be simplified.

It is preferable that the base is constituted by a flange portion of a spool of an electromagnet, because the size can be further reduced.

[0008]

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

FIGS. 1 and 2 show an electromagnetic relay according to this embodiment. The electromagnetic relay is configured to drive a contact switching mechanism 4 via a movable iron piece 2 and a card 3 by exciting and demagnetizing an electromagnet 1, and these are covered by a case 5.

The electromagnet 1 is formed by winding a coil 8 around a core 6 via a spool 7, as shown in FIG. The iron core 6 is made of a columnar ferrite, and one end of a substantially L-shaped yoke 9 is caulked and fixed to the lower end thereof. The other end of the yoke 9 is a support portion 10 extending to the side of the suction portion 6a at the upper end of the iron core 6. The spool 7 is formed of a synthetic resin material in a substantially cylindrical shape. A donut-shaped flange 11 is formed at the upper end of the spool 7. Spool 7
Has a base portion 12 extending laterally. The base portion 12 includes a bottom surface portion 13 and a pedestal portion 14 inside the upper surface portion. The base 12 has a rectangular hole 15 through which the yoke 9 penetrates, a coil terminal hole 17 into which the coil terminal 16 is press-fitted, and a press-fit recess 18 into which a movable contact piece 30 and a fixed contact piece 31 described later are press-fitted.
a and 18b are formed respectively. As shown in FIG. 4, a terminal hole 19 and an auxiliary terminal hole 20 are formed at both ends of each of the press-fit recesses 18a and 18b.
In the press-fitting concave portion 18 a, ridges are formed in three rows, so that even the movable contact piece 30 which is thinner than the fixed contact piece 31 can be properly press-fitted. Further, on the lower surface of the base portion 12 (bottom portion 13), for example, as shown in FIG. 4A or 4B, concave portions 21 communicating two adjacent terminal holes 19 are respectively formed. . This recess 2
1 is used for simultaneously filling each terminal hole 19 with an adhesive, as described later. A groove 22 having a substantially arc-shaped cross section is formed in the width direction substantially at the center of the upper surface of the base portion 12 (pedestal portion 14), and a locking groove 23 (locking groove 2) is formed near the groove 22.
A protrusion similar to the press-fitting recess 18a is also formed on the inner surface of No. 3. ) Is provided. Further, the pedestal portion 14
An engagement projection 24 is formed at the center of both side surfaces and at two places on both end surfaces. The coil 8 has both ends wound around the upper end of a coil terminal 16 press-fitted into the base portion 12. The lower surface 4 of the base portion 12
Standoffs 12a are protrudingly provided at the center of the side edge, so that a gap can be secured between the printed board and the bottom surface of the base section 12 when mounted on a printed board or the like.

As shown in FIG. 3, the movable iron piece 2 is formed by bending a magnetic plate material such as ferrite at a predetermined angle, and is rotatably supported by a support portion 10 of the yoke 9. An opening 25 is formed in the bent portion of the movable iron piece 2, and a leaf spring 26 fixed near the support of the yoke 9 is locked therein. At one end of the movable iron piece 2 is formed a concave pressing portion 27 that gradually becomes thinner toward the tip.

As shown in FIG. 3, the card 3 is formed by molding a synthetic resin material into a substantially rectangular plate shape, and is provided at its lower end with a cylindrical support shaft 28 projecting to both sides. The first and second protrusions 29a and 29a are provided on both upper surfaces of the card 3.
b are formed respectively. As shown in FIG.
The projection 29a contacts the pressing portion 27 of the movable iron piece 2, and the second projection 29b contacts a movable contact piece 30 described later.

As shown in FIGS. 6 and 7, the contact opening / closing mechanism 4 is provided with a movable contact piece 30 opposed to the base at a predetermined interval.
And the fixed contact piece 31. An upper end of the movable contact piece 30 is bent in a substantially rectangular shape, and a movable contact 32 is fixed by caulking below the lower side. At the lower end side of the movable contact piece 30, a press-fit portion 33 that is press-fit into the press-fit recess 18 a of the base portion 12 is formed. A pair of press-fit projections 34 are formed on both sides of the press-fit portion 33 by a press or the like. A terminal portion 35 and an auxiliary terminal portion 36 are formed from an edge near the press-fitting protrusion 34.
And extend downward. As shown in FIG. 8, the terminal portion 35 penetrates the terminal hole 19 of the base portion 12, and the auxiliary terminal portion 36 is located in the auxiliary terminal hole 20. The fixed contact piece 31 is fixed to the upper end portion by a fixed contact 37 which is opposed to the movable contact 32 so as to be able to contact and separate therefrom. The lower end is formed of a press-fit portion 38, a terminal portion 39, and an auxiliary terminal portion 40, as in the case of the movable contact piece 30.
Is formed with a pair of press-fit projections 41.

As shown in FIG. 3, the case 5 has a substantially box shape with an open lower surface, and an engagement hole into which an engagement protrusion 24 of the base portion 12 of the electromagnet 1 is engaged. 42 are drilled. Further, as shown in FIG. 9, an extension portion 43 is formed downward from the ceiling surface of the case 5.
The tip of the extension 43 is split into two branches, one of which is the card 3
A holding portion 44 for preventing the support shaft 28 from falling off from the groove portion 22 of the base portion 12, and a locking portion 45 locked to the locking groove 23 of the base portion 12. A guide portion 46 is formed at the base of the extending portion 43 along the bent portion of the movable iron piece 2 and is pressed against the distal end surface thereof by the distal end of the leaf spring 26 to prevent the movable iron piece 2 from being displaced. In addition, the mounting state of the case 5 on the base portion 12 is improved.

Next, a method of assembling the electromagnetic relay will be described.

First, the coil terminal 16 is press-fitted into the coil terminal hole 17 formed in the base portion 12, and the coil 8 is wound via the spool 7. Then, a leaf spring 26 provided on the yoke 9 is inserted through the opening 25, and one end of the yoke 9 is caulked and fixed to the lower end of the iron core 6. Thus, the electromagnet 1 is completed. Subsequently, both ends of the coil 8 are wound around the coil terminals 16 respectively. Further, the movable contact piece 30 and the fixed contact piece 31 are press-fitted into the terminal holes 19 and 20 formed in the base portion 12 of the electromagnet 1 so that each terminal portion 35 projects from the lower surface. Thereafter, the movable iron piece 2 is arranged between the upper end 10 of the yoke 9 and the leaf spring 26, and is supported rotatably.

Next, the support shaft 28 of the card 3 is arranged in the groove 22 of the base portion 12, the first projection 29a is brought into contact with the pressing portion 27 of the movable iron piece 2, and the second projection is
Contact. Thereby, the elastic force of the movable contact piece 30 acts on the movable iron piece 2 via the card 3, and the movable iron piece 2
One end is separated from the suction part 6a of the iron core 6, and the position is regulated. Further, since the pressing portion 27 is formed in a concave shape that gradually becomes thinner toward the tip, even before the electromagnet 1 is excited, the upward movement of the first protrusion 29a, that is, the card 3 is prevented.

Here, the electromagnet 1 is excited to check the operation characteristics. In this case, when the movable iron piece 2 rotates, the pressing portion 2
7, the first protrusion 29a of the card 3 is pressed.
Since the pressing portion 27 has the above-described shape, a force acts to press the card 3 toward the base portion 12. Therefore, the displacement of the support shaft 28 of the card 3 from the groove 22 of the base does not occur, and the inspection of the operation characteristics can be appropriately performed.

When the inspection is completed, the case 5 is put on the base portion 12, the engaging protrusion 24 of the pedestal portion 14 is engaged with the engaging hole 42 of the case 5, and the bottom surface of the base portion 12 is sealed. Complete the electromagnetic relay. In this case, the sealant does not enter the support shaft 28 of the card 3 or the like. Also, the holding portion 44 of the extension portion 43 formed on the case 5 reliably prevents the support shaft 28 of the card 3 from dropping out of the groove 22 of the base. The position of the extending portion 43 itself is prevented by the locking portion 45 being locked in the locking groove 23.

Next, the operation of the electromagnetic relay will be described.

When the electromagnet 1 that does not energize the coil 8 is not excited, the movable contact piece 30 stands upright by its own elastic force, and the movable contact 32 faces the fixed contact 37 at a predetermined interval. In addition, the movable iron piece 2 is centered on the support portion 10 of the yoke 9 via the card 3 by the elastic force of the movable contact piece 30.
1 rotates clockwise in FIG. 1, and one end is separated from the suction part 6 a of the iron core 6.

When the coil 8 is energized to excite the electromagnet 1, one end of the movable iron piece 2 is attracted to the attracting portion 6a of the iron core 6, and the movable iron piece 2 is supported by the support 10 of the yoke 9 as a fulcrum in FIG. It rotates in the counterclockwise direction. Thus, the card 3 whose first protrusion 29 a is pressed by the pressing portion 27 of the movable iron piece 2 rotates clockwise in FIG. 1 around the support shaft 28 provided in the groove 22 of the base 12. The card 3 is pressed by the pressing portion 27 of the movable iron piece 2 into the base portion 1.
The support shaft 28 is rotated while being pressed to the side 2, and the support shaft 28 is formed by a pressing portion 44 formed on the case 5.
Is reliably prevented. Therefore, the card 3 is smoothly rotated by the excitation of the electromagnet 1, and the movable contact piece 30 is elastically deformed by the second protrusion 29 b to close the movable contact 32 to the fixed contact 37.

[0023]

As is apparent from the above description, according to the present invention, the auxiliary terminal portion is formed in the contact piece and the auxiliary terminal hole is formed in the base. It can be firmly fixed to the base in a well-balanced manner, and desired operating characteristics can be reliably obtained.

[Brief description of the drawings]

FIG. 1 is a front sectional view of an electromagnetic relay according to the present embodiment.

FIG. 2 is a perspective view without the case of FIG. 1;

FIG. 3 is an exploded perspective view of FIG. 2;

FIG. 4 shows an example of the bottom view of FIG.

FIG. 5 is an enlarged sectional view showing a portion near the card in FIG. 1;

FIG. 6 is a perspective view (a) and a front view (b) showing the movable contact piece of FIG. 1;

7A and 7B are a perspective view and a front view, respectively, showing the fixed contact piece of FIG.

FIG. 8 is a side sectional view of FIG. 2;

FIG. 9 is a partially cutaway perspective view of the case of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electromagnet 2 ... Movable iron piece 3 ... Card 4 ... Contact opening / closing mechanism 5 ... Case 7 ... Spool 9 ... Yoke 12 ... Base part 13 ... Bottom part 14 ... Pedestal parts 18a, 18b ... First and second press-fitting concave parts 19 ... Terminal Hole 20 ... Auxiliary terminal hole 21 ... Recess 22 ... Groove 27 ... Pressing part 28 ... Support shaft 29a, 29b ... First and second projections 30 ... Movable contact piece 31 ... Fixed contact piece 32 ... Movable contact 33, 38 ... Press-fit part 34, 41 ... press-fit projections 35, 39 ... terminals 36, 40 ... auxiliary terminals 37 ... fixed contacts

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroki Sanada 1110 Ojisugi, Yamaga-shi, Kumamoto Omron Kumamoto Co., Ltd.

Claims (3)

[Claims] 1. A base having a press-fitting recess formed from an upper surface and having a terminal hole penetrating from the press-fitting recess to the lower surface, a press-fitting portion press-fitted into the press-fitting recess of the base, and A contact portion that is extended and provided with a contact at the tip,
A contact portion extending downward from one side edge of the press-fitting portion and having a terminal portion penetrating through the terminal hole of the base; and In an electromagnetic relay adapted to fix a portion, an auxiliary terminal portion is formed on the other side edge of the press-fit portion on the contact piece, and an auxiliary terminal hole through which the auxiliary terminal portion is inserted into the press-fit recess of the base. An electromagnetic relay characterized by having a hole. 2. The electromagnetic relay according to claim 1, wherein at least two terminal holes formed in the base are communicated with a recess for injecting the adhesive. 3. The electromagnetic relay according to claim 1, wherein the base is formed by a flange of a spool of an electromagnet.