JP2604534B2 - 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 a small electromagnetic relay mounted on a printed circuit board.

[0002]

2. Description of the Related Art In order to make an electromagnetic relay small and thin, it is known to arrange a contact portion in a space surrounded by a U-shaped magnetic circuit portion (Japanese Patent Publication No. 57-13090). The electromagnetic relay includes a magnetic circuit portion formed in a U-shape by an iron core and yokes provided at both ends of the iron core, an exciting coil wound around the iron core of the magnetic circuit portion, and a yoke of the magnetic circuit portion. Armature, a contact portion including a fixed contact spring and a movable contact spring disposed in a space surrounded by the U-shaped magnetic circuit portion, and turns on and off an exciting coil wound around the iron core. When the armature is attracted to and released from the yoke, the movable contact spring is driven to open and close the contact. According to such an electromagnetic relay, the contact portion is arranged in a space surrounded by the U-shaped magnetic circuit portion, so that it can be made small and thin.

[0003]

As described above, in the small and thin electromagnetic relay, the electrical insulation between the fixed contact spring and the movable contact spring at the contact portion and the exciting coil and the coil terminal of the exciting coil is provided. Therefore, it is necessary to provide an appropriate insulation distance between them, so that it is difficult to reduce the size while ensuring electrical insulation. SUMMARY OF THE INVENTION An object of the present invention is to obtain a small and thin electromagnetic relay by securing electrical insulation between a fixed contact spring and a movable contact spring, an exciting coil and a coil terminal of the exciting coil.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a substrate made of an insulating member, a plate-shaped fixed core having legs fixed to an end of the substrate, and a fixed core supported by the fixed core. A bobbin having a terminal portion integrally formed with the bobbin portion along the flat surface of the leg portion of the fixed core along with the bobbin portion on which the exciting coil is wound, and a leg portion of the fixed core portion at the terminal portion of the bobbin frame 2 attached along the flat surface of
A fixed contact spring and a movable contact spring, each of which has a fixed contact and a movable contact on an opposing surface located inside the fixed iron core, and the respective contact terminals are fixed to the substrate, A flat armature abutting on the rear surface of the movable contact spring and being arranged along the flat plate surface of the fixed core and swingably supported at an end of the substrate, and a case covered by the substrate, The operating member is characterized in that it has an overhanging piece covering the fixed contact spring and the movable contact spring.

[0005]

[Function] By arranging flat fixed iron cores and armatures in a stack, and arranging fixed contact springs and movable contact springs inside the fixed iron core, the thickness of the electromagnetic relay becomes extremely thin, and the vertical and horizontal lengths are reduced. The dimensions can also be kept close to the outer dimensions of the fixed core, and the fixed contact spring and the movable contact spring are covered by the projecting piece of the operating member attached to the armature, so that the fixed contact spring, the movable contact spring and the exciting coil In addition, the insulation distance between the coil terminal of the exciting coil and the coil terminal can be ensured.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 (A) is an exploded perspective view of the armature, FIG. 1 (B) is a perspective view of the armature of FIG. 1 (A) viewed from the opposite side, and FIG. 1 (C) is FIG.
FIG. 2B is a sectional view taken along the line CC, and FIG. 2 is an exploded perspective view of an electromagnetic relay using the armature of FIG. First, in FIG. 2, reference numeral 1 denotes a substrate made of a molded resin, on which a fixed contact spring 3 having a fixed contact 2 and a movable contact spring 5 having a movable contact 4 are fixed. 6 and 7
Are contact terminals integral with the fixed contact spring 3 and the movable contact spring 5, respectively.

Reference numeral 8 denotes a gate-shaped fixed iron core punched from a flat iron plate, and tips 8a and 8b of both leg pieces are pressed into mounting holes 9 and 10 of the substrate 1, respectively, and are supported on the substrate 1. The body of the fixed core 8 is made of molded resin,
A winding frame 11 having a winding drum portion around which an exciting coil 12 is wound is attached. A terminal portion 11A to which the coil terminals 13 and 14 are attached is formed integrally with the winding frame 11. Both ends of the winding of the exciting coil 12 are connected to coil terminals 13 and 14 attached to the terminal portion 11A of the winding frame 11, respectively. When the fixed iron core 8 is attached to the substrate 1, the coil terminals 13 and 14 are inserted into holes 15 and 16 formed in the substrate 1, respectively, and their tips protrude from the bottom surface of the substrate 1.

An armature 17 is also punched from a flat iron plate, and is arranged along the side surface of the fixed core 8 so as to bridge both legs of the fixed core 8 as shown in the figure. The armature 17 has a support shaft 18 at a lower end of the substrate 1.
And supported by the substrate 1 so as to be pivotable about the support shaft 18. At that time, the leg piece 20 at the lower end of the other end
Is fitted into the square hole 21 of the substrate 1 via a gap, so that the turning range of the armature 17 is regulated.
An operating piece 22 as an operating member made of an insulating material is elastically fitted into the body of the armature 17. The operation piece 22 comes into contact with the rear surface of the movable contact spring 5 in a state where the armature 17 is supported by the substrate 1.

Reference numeral 23 denotes a case which covers the substrate 1 on which the fixed iron core 8 and the armature 17 are mounted, and has two grooves 24 provided on both sides of the substrate 1 and a corresponding case 23.
Is fixed by engagement with the projection 23a. In such a configuration, when a DC exciting current is applied to the exciting coil 12, the armature 17 turns around the support shaft 18 and is attracted to the fixed core 8. At this time, the movable contact spring 5 is pressed via the operation piece 22 to close the gap between the fixed contact 2 and the movable contact 4. When the excitation of the excitation coil 12 is released, the armature 17 returns to the illustrated state by the spring force of the movable contact spring 5.

FIG. 1 shows the armature 17 in detail. In FIG. 1, the operating piece 22 has a U-shaped cross-section so as to hold the armature 17 on both side walls, and a pair of ridges 25 that are engaged with the back surface of the armature 17 are formed at the ends of the both side walls. A hole 26 of the armature 17 is provided on a surface of the operation piece 22 facing the armature 17.
A columnar projection 27 is formed which is densely inserted into the projection.
A non-magnetic thin plate 28 is sandwiched between the armature 17 and the operation piece 22. The non-magnetic thin plate 28 is shown in FIG.
And (C), the operating piece 22 and the armature 1
7, the tip of the armature 17 is adapted to cover the contact surface 17 a of the armature 17. When the armature 17 is attracted to the fixed core 8, the fixed core 8 and the armature 17 are separated from each other. A gap corresponding to the thickness of the non-magnetic thin plate 28 is generated between the contact surface 17a and the contact surface 17a, so that the holding force of the electromagnet decreases and the return voltage increases. The non-magnetic thin plate 28 may be attached as needed.

The operating piece 22 attached to the armature 17 is provided with a projecting piece 22a. The projecting piece 22a of the operating piece 22 is L-shaped and formed so as to cover the fixed contact spring 3 and the movable contact spring 5. The vertical portion of the projecting piece 22a of the operating piece 22 is
Also, the insulation distance between the tip of the movable contact spring 5 and the coil terminals 13 and 14 of the exciting coil 12 is ensured. The horizontal portion of the projecting piece 22a of the operating piece 22 is
In addition, an insulation distance between the movable contact spring 5 and the exciting coil 12 is ensured. Further, the overhanging piece 22a of the operating piece 22 prevents the contact scattered matter due to the arc caused by the opening and closing of the fixed contact 2 and the movable contact 4 from adhering to the exciting coil 12, the armature 17, or the contacting surface of the fixed iron core 8, and exciting. The contact scattered matter adheres to the surface of the coil 12 to degrade insulation, or the contact scattered matter adheres to the contact surface and the fixed core 8 of the armature 17.
It prevents that the adsorption to is prevented.

[0012]

According to the present invention, the electromagnetic relay is made small and thin by arranging fixed iron cores and armatures formed in a plate shape so as to be laminated, and arranging fixed contact springs and movable contact springs inside the fixed iron core. Can be configured in shape. The insulation distance between the fixed contact spring and the movable contact spring and the exciting coil and the coil terminal of the exciting coil in the small and thin electromagnetic relay is determined by an operating piece attached to the armature to push the movable contact spring. Can be secured by the overhanging piece provided on the working piece, and the overhanging piece provided on the operating piece can prevent contact flying objects generated by the arc caused by opening and closing of the fixed and movable contacts from the surface of the exciting coil and the contact surface of the fixed iron core. This has the effect that it can be prevented from adhering to the surface.

[Brief description of the drawings]

1A and 1B show an embodiment of the present invention, wherein FIG. 1A is an exploded perspective view of an armature, FIG. 1B is a perspective view of the armature of FIG. 1A viewed from the opposite side, and FIG. C-C
It is sectional drawing which follows a line.

FIG. 2 is an exploded perspective view of an electromagnetic relay using the armature of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 3 Fixed contact spring 5 Movable contact spring 8 Fixed iron core 11 Reel 11a Terminal part 12 Exciting coil 13 Coil terminal 14 Coil terminal 17 Armature 22 Operating member 22a Overhanging piece

Claims (1)

(57) [Claims] 1. A board made of an insulating member, a flat fixed core having leg pieces fixed to an end of the board, a winding drum supported by the fixed core and having an exciting coil wound thereon, and legs of the fixed core. A winding frame having a terminal portion integrally formed with the winding drum along the flat surface of the piece, and attached to the terminal portion of the winding frame along the flat surface of the leg piece of the fixed core and inserted through the substrate. 2
A fixed contact spring and a movable contact spring, each of which has a fixed contact and a movable contact on an opposing surface located inside the fixed iron core, and the respective contact terminals are fixed to the substrate, A flat armature abutting on the rear surface of the movable contact spring and being arranged along the flat plate surface of the fixed core and swingably supported at an end of the substrate, and a case covered by the substrate, An electromagnetic relay, wherein the actuating member has a projecting piece covering the fixed contact spring and the movable contact spring.