JPH05266777A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To suppress the leaking out of the crash noise made by a core and an armature and the vibrational noise transmitted to a terminal. CONSTITUTION:A relay main body 1 provided with a coil 2, a core 3, a yoke 4, an armature 5, a movable contact 7 or a fixed contact 8 or the like is covered with covers 10, 12 having the double-structure. A clearance between the covers 10, 12 is filled with the very low elastic resin 11, and is sealed by a bottom plate 14. Noise and vibrational noise to be generated by a collision of the armature 5 and the core 3 or a collision of the contacts is absorbed by the very low elastic resin 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hinge type electromagnetic relay, and more particularly to an electromagnetic relay having an improved cover structure for covering a relay body.

[0002]

2. Description of the Related Art Conventionally, such a hinge type electromagnetic relay, particularly an electromagnetic relay provided with an L-shaped yoke has a structure as shown in, for example, Japanese Patent Laid-Open No. 62-237631.

FIG. 5 is a perspective view showing a state in which the cover of the electromagnetic relay showing such a conventional example is removed. As shown in FIG. 5, a conventional electromagnetic relay has a spool around which a coil 2 is wound and a core (not shown) is mounted, an L-shaped yoke 4,
A hinge spring 6 having one end fixed to the yoke 4, an armature 5 supported by the hinge spring 6 at the tip of the yoke 4, and a hinge spring 6 which is continuous with the hinge spring 6
The relay body 1 includes a movable contact spring 7 having a movable contact 15 formed at the tip opposite to the side, a fixed contact spring 8 having fixed contacts 16a and 16b formed at the tip, and a terminal 13 and a boss 9. ing. Conventionally, it is formed by covering the relay body 1 with a cover (not shown) having a single structure.

In such an electromagnetic relay, the L-shaped yoke 4 is magnetically coupled to one end of a core whose one end is provided at the center of the coil 2. Also, the armature 5 is a yoke 4
Is supported by the hinge spring 6 connected to the core and is disposed opposite to the other end of the core. In such an electromagnetic relay, the armature 5 is attracted to or separated from the core by the excitation / non-excitation of the coil 2, and the movable contact 15 is brought into contact with or separated from the fixed contacts 16a and 16b through the movable contact springs interlocked with the armature 5, thereby turning ON-. It is being turned off.

[0005]

In the above-mentioned conventional electromagnetic relay, the core inserted in the center of the coil and the armature to be attracted and separated are both made of a metal material. Therefore, there is a drawback that a large impact sound is generated each time the core and the armature collide with or separate from each other in response to the excitation or non-excitation of the coil.

It is an object of the present invention to provide an electromagnetic relay that absorbs the impact sound of the core and armature generated in response to the excitation or non-excitation of the coil and makes the state almost silent to the outside.

[0007]

The electromagnetic relay of the present invention comprises:
A spool around which a coil is wound, a core is mounted, an L-shaped yoke, a hinge spring connected to and fixed to the yoke, an armature supported by the hinge spring and facing the magnetic pole surface of the core, and a movable contact. A relay body having a movable contact spring formed at the tip and interlocking with the armature and a fixed contact spring having a fixed contact formed at the tip; a first cover covering the relay body; the relay body; Second cover for covering the cover and a part of the terminal, an extremely low elastic resin made of a non-magnetic material injected between the first and second covers and at the bottom of the relay body, and at the bottom of the relay body. Arranged and said second
And a bottom plate that covers the relay body.

[0008]

An embodiment of the present invention will be described with reference to the drawings. 1 is a vertical cross-sectional view of an electromagnetic relay showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view seen from the direction A in FIG. As shown in FIGS. 1 and 2, this embodiment has a relay body 1 and a coil 2 wound around a spool.
, The core 3 and the L-shaped yoke 4 are mounted, and the coil 2
One end of the core 3 provided at the center of is connected to the yoke 4. An armature 5 is supported by a hinge spring 6 fixed to the yoke 4, and is arranged opposite to the other end of the core 3. A movable contact spring 7 fixed to the armature 5 by a boss 9 has a movable contact 15 at its tip. This movable contact 15 is a fixed contact provided at the tip of a fixed contact spring 8 planted in the relay body 1. It is arranged between 16a and 16b. The relay body 1 has a double-structured first cover 10
And the second cover 12, and the extremely low elastic resin 11 is interposed between them. The bottom of the body 1 is sealed with the substrate 14. In this relay body 1, the coil 2 is excited by energizing the coil terminal 13, and the armature 5 is attracted to the core 3. When the armature 5 collides with the core 3, a shock wave is transmitted to the terminal 13 and a vibration sound is generated. Further, a collision sound at the time of collision is also generated from the inside. However, in this embodiment, since the extremely low-elasticity resin 11 is put in the entire gap between the first cover 10 and the second cover 12, the vibration noise and the collision noise leaking to the outside can be reduced.

FIG. 3 is a vertical sectional view of an electromagnetic relay showing another embodiment of the present invention. As shown in FIG. 3, in the present embodiment, the relay body 1 and the first and second covers 10 and 12 are the same as those in the above-described embodiment, but the first cover 1
It is different that the extremely low-elasticity resin 11 is applied to the upper part of the gap between the 0 and the second cover 12 and the lower part on the terminal 13 side.
Also in this embodiment, the vibration noise and the collision noise can be made extremely small as compared with the conventional case.

FIG. 4 is a characteristic diagram of vibration and collision noise of the electromagnetic relay shown in FIGS. 1 and 3. As shown in FIG. 4, here, sound pressure (dB) comparisons are made between the conventional example in which the cover has a single structure and the example in which the cover has a double structure, and the solid line and the dotted line represent two types of relays. According to this, in the present embodiment, noise and vibration noise can be reduced by 20 to 30% compared to the conventional example.

[0011]

As described above, since the electromagnetic relay of the present invention is provided with the extremely low elastic resin in the gap of the double cover, the collision noise between the armature and the core generated in response to the excitation and de-excitation of the coil. About 20 ~ vibration noise transmitted to the terminals
There is an effect that it can be reduced by 30%.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an electromagnetic relay showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view seen from the direction A in FIG.

FIG. 3 is a vertical cross-sectional view of an electromagnetic relay showing another embodiment of the present invention.

4 is a characteristic diagram of vibration and collision noise of the electromagnetic relay shown in FIGS. 1 and 3. FIG.

FIG. 5 is a perspective view of a conventional example in which an electromagnetic relay cover is removed.

[Explanation of symbols]

 1 relay body 2 coil 3 core 4 yoke 5 armature 6 hinge spring 7 movable contact spring 8 fixed contact spring 10, 12 cover 11 extremely low elastic resin 14 bottom plate 15 movable contact 16a, 16b fixed contact

Claims (3)

[Claims] 1. A spool around which a coil is wound, a core is mounted, an L-shaped yoke, a hinge spring connected and fixed to the yoke, and a magnetic pole surface of the core supported by the hinge spring and fixed to the spool. An armature and a movable contact formed at the tip and a movable contact spring interlocking with the armature, and a fixed contact spring having a fixed contact formed at the tip, a first cover for covering the relay body, and the relay A main body, a second cover that covers the first cover and a part of the terminal, an extremely low elastic resin made of a non-magnetic material injected between the first and second covers and at the bottom of the relay main body, An electromagnetic relay, comprising: a bottom plate that is arranged at the bottom of the relay body and covers the relay body together with the second cover. 2. The extremely low elasticity resin is the first and second
The electromagnetic relay according to claim 1, wherein the electromagnetic relay is formed so as to cover the entire circumference of the relay body between the covers. 3. The extremely low elasticity resin is the first and second
The electromagnetic relay according to claim 1, wherein the electromagnetic relay is formed so as to cover an upper portion and a lower portion of the relay body, excluding an intermediate portion, between the covers.