JP3211917B2 - 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 ultra-compact electromagnetic relay mounted on a printed board.

[0002]

2. Description of the Related Art Japanese Patent Publication No.
42766 is known. 4 to 6
FIG. 4 shows the electromagnetic relay again, FIG. 4 is a perspective view showing the insulating substrate portion and the operating electromagnet portion separated, and FIG. 5 is a perspective view showing a state where the operating electromagnet portion is assembled to the insulating substrate portion. 6 is a plan view of the insulating substrate portion. In these figures, the operation electromagnet 30 is formed by a plate-shaped portal iron core 31 in which an exciting coil 34 is wound around a body portion via a winding frame 32, and a plate-shaped armature 35 arranged along the plate surface. The gate-shaped iron core 31 is supported by being pressed into the insertion hole 13 of the insulating substrate 10 with both leg end portions thereof, and the coil terminal 33 fixed to one end of the winding frame 32 is provided on the insulating substrate 10 in contact with the gate-shaped iron core 31. Terminal hole 12a drilled in wall member 12
Is inserted. Also, the armature 35 is rotatably supported with one leg 35a at one end inserted into the receiving hole 14 of the insulating substrate 10 and pivotally supported at the other end of the armature 35 against the wall surface of the receiving groove 15 of the insulating substrate 10. The range is regulated.

A fixed contact 20 is provided on an insulating substrate 10 in parallel with the flat surface of a gate-shaped iron core 31 to form a fixed contact terminal 2 integral therewith.
1 and fixed by insert molding,
A fixed contact 22 is attached to the end located between the two legs. A movable contact terminal 23 is fixed to the insulating substrate 10 by insert molding, and one end of the movable contact terminal 23 is fixed to the free end of the movable leaf spring 24 which is cantilevered and supported by the movable contact 25 in opposition to the fixed contact 22. Is attached. The fixed contact terminal 21 and the movable contact terminal 23 are aligned on the same plane parallel to the flat surface of the portal iron core 31, but the movable leaf spring 24 has a portion 24a bent in a Z-shape outside the insulating substrate 10. The fixed contact 20
Is provided between the fixed contact 22 and the movable contact 25 to form a contact gap G (FIG. 6). An insulating barrier 11 a is formed integrally with the wall member 11 of the insulating substrate 10 between the gate iron core 31 and the movable leaf spring 24.

An armature 3 is provided on the back of the movable leaf spring 24.
The armature 35 is brought into contact with the armature 35 by the initial load force received via the operating piece 36 from the movable leaf spring 24 which has been given a certain preliminary deformation in a non-operating state. 31. In such an electromagnetic relay, the exciting coil 34
Is excited, the armature 35 is attracted to the portal iron core 31 and pushes the movable leaf spring 24 via the operating piece 36, which is elastically deformed to close the gap between the movable contact 25 and the fixed contact 22. .

[0005]

In the above-described electromagnetic relay, a portion 24a of the movable leaf spring 24 is bent in a Z shape outside the insulating substrate 10. However, since the bent portion 24a is apt to be out of shape, the contact gap G in the free state of the movable leaf spring 24, that is, in a state before the armature 35 is assembled, is left as it is.
(FIG. 6) has a large variation, and there is a problem that the adjustment work is troublesome. If the variation in the contact gap G is large, the variation in the load force of the movable leaf spring 24 on the operating electromagnet 30 will also be large, and the operating characteristics of the electromagnetic relay will not be constant.

FIG. 7 is a load characteristic diagram for explaining the variation of the load force due to the variation of the contact gap G. The horizontal axis represents the suction stroke of the armature 35, and the vertical axis represents the armature 3.
5 is the load force received from the movable leaf spring 24. In the figure, the load power increases as the armature 35 is attracted in view of the stroke S _0, soared load force between the movable contact 25 at the point of the stroke S ₁ is in contact with the fixed contact 22, is thereafter armature 35 Gate It increases until it is adsorbed by the core 31. In this case, if the contact gap G varies ΔG in the free state of the movable leaf spring 24, the load force varies ΔP.

On the other hand, the guide portion 12b is integrally formed on the wall member 12 of the insulating substrate 10, and the insulating substrate 10 of the portal iron core 31 is formed.
At the time of press-fitting, the one leg portion is guided by the guide portion 12b to facilitate assembly. However,
Conventionally, since the guide portion is provided on only one side, the guide function at the time of assembly has not been sufficient. SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic relay in which the shape of a movable leaf spring is made accurate to suppress variations in contact gaps. Another object of the present invention is to make it easier for the electromagnetic relay to assemble the portal iron core to the insulating substrate.

[0008]

SUMMARY OF THE INVENTION In order to suppress the variation in the contact gap, the present invention provides a movable leaf spring which is bent in a Z-shape near an end joined to a movable contact terminal. The bent portion is embedded in the insulating substrate by insert molding. Similarly, in order to suppress the variation of the contact gap, the present invention joins a movable leaf spring to a movable contact terminal bent in a Z-shape, and further includes a joint portion of the movable leaf spring and a bent portion of the movable contact terminal. Is embedded in the insulating substrate by insert molding. In addition, in order to facilitate the assembling of the portal iron core, the present invention provides a guide portion for guiding both legs of the portal iron core on the insulating substrate.

[0009]

According to the present invention, a Z-shaped bent portion of a movable leaf spring or a movable contact terminal for providing an interval between the fixed contactor is embedded in the insulating substrate by insert molding, and is movable outside the insulating substrate. The leaf spring can be kept straight. As a result, the bent portion that is likely to be out of order is completely restrained by the mold resin in the insulating substrate,
Variations in the contact gap are reduced. In addition, a guide portion for guiding both legs of the portal core is provided on the insulating substrate to enhance a guiding function when the portal core is inserted into the insulating substrate.

[0010]

1 and 2 show a first embodiment of the present invention. FIG. 1 is a plan view of an insulating substrate to which a fixed contact and a movable leaf spring are attached, and FIG. It is a perspective view which shows the portal iron core inserted in this. Note that the same reference numerals are used for the portions corresponding to the conventional example.
In the figure, the movable leaf spring 24 is bent in a Z-shape in the vicinity of an end 24b joined to the movable contact terminal 23 in order to provide a predetermined interval between the movable contact spring 23 and the fixed contact 20. Both the bent portion 24b and the bent portion 24a are embedded in the wall member 11 of the insulating substrate 10 by insert molding, and the movable leaf spring 24 has a straight shape outside the insulating substrate 10. The wall member 11 is integrally formed with a guide portion 11b for guiding the insertion of the portal iron core 31 so as to form a pair with the guide portion 12b of the wall member 12.

FIG. 3 is a plan view of an insulating substrate portion showing a second embodiment of the present invention. In this embodiment, in order to provide a predetermined interval between the fixed contact 20 and the movable leaf spring 24, the end 24a of the movable contact terminal 23 to which the end 24b of the movable leaf spring 24 is joined and the terminal portion are used. The intermediate portion 23c of the terminal portion 23b protruding from the bottom surface of the insulating substrate 10 is bent in a Z-shape, and the joint portion 24b of the movable leaf spring 24 and the bent portion 23c of the movable contact terminal 23 are formed by insert molding into the wall of the insulating substrate 10. It is embedded in the member 11. Thus, the movable leaf spring 24 has a straight shape.
The wall member 11 is integrally formed with a guide part 11b for guiding the insertion of the portal iron core 31 so as to form a pair with the guide part 12b of the wall member 12. In this embodiment, the positional relationship between the receiving hole 14 into which the leg portion 35a of the armature 35 is inserted and the receiving groove 15 for restricting the movement of the projecting portion 35b is opposite to the left and right in the first embodiment. Functionally, there is no special difference.

In these embodiments, both the bent portion 24a of the movable leaf spring 24 and the bent portion 23c of the movable contact terminal 23, which are likely to be out of order, together with the joint portion 24b of the movable leaf spring 24 are formed in the wall member 11 of the insulating substrate 10. The movable leaf spring 24 has a straight shape on the outside thereof. As a result, even when the molding of the insulating substrate 10 is completed, the variation in the contact gap G is sufficiently small, and subsequent adjustment is almost unnecessary. Further, since the insulating substrate 10 is provided with the guide portions 11b and 12b on both sides, the gate-shaped iron core 31 press-fitted into the insertion hole 13 is guided by both legs to correct the inclination, thereby improving workability. In both cases, the assembly accuracy is improved.

[0013]

According to the present invention, the variation of the contact gap is suppressed, the adjustment work is simplified, and the assembling work of the portal iron is facilitated, so that the number of assembling steps can be reduced and the assembling accuracy can be reduced. The operation characteristics of the electromagnetic relay are stabilized.

[Brief description of the drawings]

FIG. 1 is a plan view of an insulating substrate portion showing a first embodiment of the present invention.

FIG. 2 is a perspective view of an insulating substrate portion of FIG. 1 and a portal iron core inserted therein.

FIG. 3 is a plan view of an insulating substrate portion according to a second embodiment of the present invention.

FIG. 4 is a perspective view showing an insulating substrate portion and an operation electromagnet portion of a conventional electromagnetic relay separately.

5 is a perspective view showing an assembled state of an insulating substrate portion and an operation electromagnet of FIG. 4;

FIG. 6 is a plan view of an insulating substrate part of FIG. 4;

FIG. 7 is a load characteristic diagram of a movable leaf spring for explaining a variation in a contact gap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Insulating board 11b Guide part 12b Guide part 20 Fixed contact 21 Fixed contact terminal 23 Movable contact terminal 23c Bent part 24 Movable leaf spring 24a Bent part 24b Joint part 31 Portal iron core 34 Excitation coil 35 Armature

Continuation of the front page (56) References JP-A-1-302631 (JP, A) JP-A-62-103933 (JP, A) JP-A-62-103935 (JP, A) JP-A-4-55742 (JP) , U) Japanese Utility Model Showa 50-10639 (JP, U) Japanese Utility Model Showa 61-132668 (JP, U) Japanese Patent Publication No. 58-23686 (JP, B2) Japanese Patent Publication No. 52-24224 (JP, B1) Japanese Public Showa 52-12903 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 45/00-51/36

Claims (3)

(57) [Claims] An exciting coil is wound around a body, and a flat gate-shaped core is supported on an insulating substrate at the ends of both legs, and the insulating substrate is fixed via fixed contact terminals in parallel with the flat surface of the gate-shaped core. A fixed contact having a fixed contact attached to an end located between both legs of the portal iron core, and a fixed contact at a free end supported at one end by a movable contact terminal fixed to the insulating substrate. And a movable leaf spring having a movable contact attached thereto, wherein the movable leaf spring is connected to the movable contact terminal in the vicinity of an end portion thereof.
An electromagnetic relay, wherein the electromagnetic relay is bent in a letter shape, and the joint and the bent portion are embedded in an insulating substrate by insert molding. 2. A flat-plate-shaped iron core having an exciting coil wound around a body portion and supported by an insulating substrate at the ends of both legs, and said insulating substrate being fixed via a fixed contact terminal in parallel with the flat surface of said gate-shaped iron core. A fixed contact having a fixed contact attached to an end located between both legs of the portal iron core, and a fixed contact at a free end supported at one end by a movable contact terminal fixed to the insulating substrate. And a movable leaf spring having a movable contact attached thereto, wherein the movable leaf spring is joined to a movable contact terminal bent in a Z-shape, and a joint of the movable leaf spring and the movable An electromagnetic relay, wherein a bent portion of a contact terminal is embedded in an insulating substrate by insert molding. 3. The insulated substrate is provided with guide portions for guiding both legs of the gate-shaped iron core.
Electromagnetic relay as described.