JPH0982196A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate automation of the manufacture of a doubly-encased electromagnetic relay adapted for silencing. SOLUTION: A first case 11 in which an electromagnetic relay main body is enclosed is enclosed in a second case 12 having an opening in a part of it, and the opening in the second case 12 is closed by a terminal board 13 to close the second case 12. A rigid conductive member 14 is coupled to the terminal part 15 of the electromagnetic relay main body. The end of the conductive member 14 is exposed to the outside via the terminal board 13 to serve as an external terminal. The portion of the conductive member 14 between the terminal part 15 of the electromagnetic relay main body and the terminal board 13 is covered with a damping member 16. By securing the rigid conductive member 14 to the terminal board 13, the first case 11 is supported inside the second case 12 without making contact with the second case 12 and the terminal board 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay that produces a quiet operating noise.

[0002]

2. Description of the Related Art In an electromagnetic relay, when a coil is energized, a predetermined plurality of contacts come into contact with each other by attracting an excited armature of an iron core. An operating sound is generated.

[0003] The operating noise is annoying depending on the environment in which the electromagnetic relay is used, and when the electromagnetic relay is mounted on a printed circuit board, the operating noise is transmitted to the printed circuit board via external terminals, and the operating noise is increased. Since there is a problem, an electromagnetic relay in which the operation noise is reduced has been conventionally provided. As shown in Japanese Utility Model Publication No. 3-12198, the applicant of the present application has also disclosed this type of silent electromagnetic relay. Is provided.

The silent electromagnetic relay provided earlier by the applicant of the present application has a double case structure as shown in FIG.

That is, in FIG. 6, reference numeral 1 is a first case in which the electromagnetic relay main body is housed. Two
Is a terminal portion of the electromagnetic relay main body, which protrudes outside the first case 1.

[0006] Reference numeral 3 denotes a second case partially open, and the first case 1 is housed in the second case 3. Reference numeral 4 denotes a terminal plate for closing the opening of the second case with the terminal plate 4 to seal the inside of the second case 3. Reference numeral 5 denotes an external terminal, which penetrates the terminal plate 4, one end and the other end of which are inside and outside the second case 3.

Then, an elastic member 7 made of, for example, sponge is put on the outer wall of the first case 1 except for the surface from which the terminal portion 2 of the electromagnetic relay main body projects, and in that state, the terminal portion 2 of the electromagnetic relay main body is placed. And the inside of the second case of the external terminal 5 is connected by a flexible lead wire 6. Further, an elastic member 8 made of, for example, a sponge is placed on the surface of the electromagnetic relay main body from which the terminal portion 2 projects, and the elastic member 8 is interposed between the flexible lead wire 6 and the inner wall of the second case 3. In this state, the first case 1 is housed in the second case 3, and the terminal plate 4 seals the second case 3.

According to the electromagnetic relay having the structure shown in FIG.
The first case 1 accommodating the main body of the electromagnetic relay is supported by the second case 3 with the elastic members 7 and 8 interposed so as not to contact the terminal plate 4 in the second case 3. Therefore, the operation noise is reduced, and the operation noise is less likely to be transmitted to the printed circuit board via the external terminal 5.

[0009]

However, in the structure of FIG. 6, the flexible lead wire 6 is provided between the terminal portion 2 and the external terminal 5 of the electromagnetic relay body after the elastic member 7 is covered on the first case 1. There is a problem in that the electromagnetic relay is relatively complicated to manufacture because it has to be connected, and it is not suitable for automation of the manufacturing process.

Further, it is necessary to keep the non-contact state between the first case 1 accommodating the main body of the electromagnetic relay, the second case 3 and the terminal board 4 and suppress the transmission of the operation sound to the external terminal 5. In order to maintain the non-contact state, the elastic member 7,
8 is indispensable, and there is a problem that the number of parts increases and the manufacturing process becomes complicated accordingly.

In view of the above points, an object of the present invention is to provide a silent electromagnetic relay which has a simple structure and is easy to manufacture including automation.

[0012]

In order to solve the above-mentioned problems, an electromagnetic relay according to the present invention has a first case 11 in which an electromagnetic relay main body is housed, in correspondence with an embodiment of FIG. 1 described later. A part of the second case 12 for accommodating the first case and the second case 12 for closing the second case 12 and closing the opening of the second case. A conductive member 14 that is coupled to the terminal plate 13 and the terminal portion 15 of the electromagnetic relay body, and has an end exposed to the outside through the terminal plate to form an external terminal 18.
A damping member 16 for covering a portion of the conductive member between the terminal portion of the electromagnetic relay main body and the terminal plate in the second case; and the first case for the second case and Supporting means for supporting the terminal board in the second case in a non-contact state is provided.

In the above structure, noise is reduced by the double case structure, and the conductive member 14 is connected to the terminal portion 15 of the electromagnetic relay main body from the connecting portion 17 to the external terminal portion 18 exposed to the outside. Provided through 13
Since the portion of the conductive member 14 inside the second case 12 is covered by the vibration damping member 16, the vibration energy of the operation sound is absorbed by the friction between the vibration damping member 16 and the conductive member 14. Therefore, the operation sound of the electromagnetic relay body is prevented from being propagated to the external terminal portion, and the operation sound is less likely to be transmitted to the printed circuit board via the external terminal.

Further, since it can be manufactured simply by connecting one end side of the conductive member to the terminal of the electromagnetic relay body, the manufacturing is easy, and the number of parts is reduced, so that the structure can be inexpensively constructed.

Further, the conductive member is made of a rigid member, and the supporting member is constituted by fixing the rigid conductive member at the portion of the terminal plate, thereby further simplifying the structure and simplifying the manufacturing. Can be converted.

Further, the supporting means may be configured to support the first case with a second case via an elastic member.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of an electromagnetic relay according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of an electromagnetic relay according to the present invention.
It is a partial cross-sectional view of an embodiment of. In FIG. 1, 11
Is a first case in which the main body of the electromagnetic relay is housed. Reference numeral 12 denotes a second case, a part of which is an opening, and has a size to accommodate the first case 11 therein. A terminal plate 13 closes the opening of the second case 12 to seal the second case.

Reference numeral 14 is a conductive member having rigidity. Fifteen
Is a terminal portion of the electromagnetic relay body protruding from the first case 11. Reference numeral 16 is a damping member that covers the conductive member 14, and is made of, for example, a molding resin such as an epoxy resin.

FIG. 2 shows a specific structure of the conductive member 14 to which the vibration damping member 16 is added. FIG. 2 is a view showing a state where the conductive member 14 is stretched flat. As shown in FIG. 2, the conductive member 14 includes a connecting portion 17 with the terminal portion 15 of the electromagnetic relay body, and the terminal plate 13 is provided.
And an external terminal portion 18 penetrating through and projecting to the outside. The damping member 16 covers the conductive member 14 between the coupling portion 17 and the external terminal portion 18 with a molding resin.

Then, as shown in FIG.
The coupling part 17 and the terminal part 15 of the electromagnetic relay body are
For example, the conductive member 14 is connected to the first member by soldering.
Fixed to the case of.

The bending position 14a shown in FIG.
Then, as shown in FIG. 1, the conductive member 14 is bent at a substantially right angle so that the conductive member 14 extends along the side surface of the first case 11. At this time, the bending position 14a is such that the damping member 16 is located along the side surface of the first case 11 and a space is formed between the damping member 16 and the side surface of the first case 11. Has been done. That is, the side surface of the first case 11, the bent portion of the conductive member 14 and the vibration damping member 16 are configured so as not to contact with each other.

The tip of the bent portion of the conductive member 14 penetrates the terminal plate 13 to form an external terminal portion 18. Then, at the terminal board position 14b shown in FIG. 2, the conductive member 14 is fixed to the terminal board 13 with, for example, an adhesive or the like. At this time, as shown in FIG. 1, the conductive member 1 is arranged so that the terminal plate 13 and the first case 11 are not in contact with each other.
4 is fixed to the terminal board 13. This conductive member 14
By fixing the first case 11 to the terminal plate 13, the first case 11 fixed to the conductive member 14 is fixed to the terminal plate 13 in a non-contact state.

Then, as described above, the first case 11 fixed to the terminal plate 13 is housed in the second case 12, and the second case 12 is sealed by the terminal plate 13, An electromagnetic relay having the structure of FIG. 1 is constructed.

According to the electromagnetic relay of the first embodiment, it has a double case structure, and the first case 11 is not in contact with the terminal board 13 in the second case.
Since the terminal plate 13 is supported by the conductive member 14, the operation noise can be reduced.

In this case, the terminal portion 15 of the main body of the electromagnetic relay is on the side opposite to the surface of the first case 11 facing the terminal plate 13, so that the conductive member 14 integral with the external terminal portion 18 is The vibration of the operating sound, which is relatively long and propagates through the conductive member 14 via the terminal portion 15, is attenuated and reduced until reaching the external terminal portion 18.

In addition, the portion of the conductive member 14 between the connecting portion 17 with the terminal portion 15 and the external terminal portion 18 is covered with the damping member 17 made of molding resin, so that the conductive member 14 propagates. The vibration energy of the operation sound is absorbed by the friction between the vibration damping member 17 and the conductive member 14, so that the vibration energy of the operation sound is hardly transmitted to the external terminal portion 18. Therefore, when the electromagnetic relay of FIG. 1 is mounted on a printed circuit board, the operation sound of the electromagnetic relay main body is hardly transmitted to the printed circuit board, and the operation sound is not amplified.

Incidentally, according to an experiment conducted by the inventor of the present application, in the case of the electromagnetic relay according to the first embodiment of FIG. 1, it is -10 dB as compared with an electromagnetic relay having no noise suppression measures such as a double case structure. 1 in a case where the conductive member 14 is not covered by the vibration damping member 16 as shown in FIG.
With respect to the electromagnetic relay configured as described above, the result of reducing the operating noise of -4 dB was obtained.

In the electromagnetic relay of the first embodiment, a part of the rigid conductive member 14 is used as the external terminal portion 18, and the conductive member 14 allows the terminal portion 15 and the external terminal portion 18 of the electromagnetic relay main body to be formed. Since and are electrically connected to each other, the flexible lead wire as in the case of the electromagnetic relay shown in FIG. 6 is unnecessary, the number of parts is reduced, and the manufacturing is facilitated. Therefore, there is a merit that the manufacturing of the electromagnetic relay can be automated and the electromagnetic relay can be manufactured at low cost.

Next, a second embodiment of the electromagnetic relay according to the present invention will be described. FIG. 3 is a partial cross-sectional view of the electromagnetic relay according to the second embodiment. In the second embodiment, the same components as those of the electromagnetic relay of the first embodiment are designated by the same reference numerals to simplify the description.

In the second embodiment, an elastic member 21 made of, for example, a foamed resin material is interposed between the terminal plate 13 and the first case 11 so that the terminal plate 13 and the first case 11 are connected to each other.
The non-contact with the case 11 is surely realized.

Further, an elastic member 22 made of, for example, a foamed resin material is covered on the surface where the conductive member 14, the vibration damping member 16 and the terminal portion 15 of the electromagnetic relay main body are present, and the first case 11 and the second case By inserting into the inside of 12 and manufacturing it, non-contact of the terminal part 15 of an electromagnetic relay main body and the 2nd case 12 is implement | achieved reliably. Otherwise, the configuration is exactly the same as that of the first embodiment.

According to the second embodiment, the sound insulation effect of the double case structure is provided by the elastic members 21 and 22.
Can be even higher.

According to the structure of the second embodiment, even if the conductive member 14 does not have the rigidity to support the first case 11 reliably, the conductive member 14 can be connected to the terminal plate 13 and the first case. It is possible to realize the non-contact of the above and the non-contact of the terminal portion 15 and the second case 12.

Next, a third embodiment and a fourth embodiment will be described. In the third and fourth embodiments, the structure is devised so as to increase the surface area of the portion of the conductive member 14 covered with the vibration damping member 16, and the vibration damping effect is further enhanced. The configuration of the entire electromagnetic relay may be the configuration of the first embodiment or the configuration of the second embodiment.

FIG. 4 shows an essential part of the third embodiment. FIG. 4A is a view of the conductive member 14 as seen from the end face direction thereof, and FIG. 4B shows the conductive member 14 at the first position. It is the figure seen from the said side surface direction of the case 11 of FIG. In FIG. 4, the damping member 16 is shown by a dotted line.

That is, in the third embodiment, the portion 1 of the conductive member 14 covered by the vibration damping member 16 is covered.
4c is made thin and the width is widened, and this portion 14c
Increase the surface area of.

FIG. 5 shows an essential part of the fourth embodiment. FIG. 5A is a view of the conductive member 14 as seen from the end face direction thereof, and FIG. 5B shows the conductive member 14 at the first position. It is the figure seen from the said side surface direction of the case 11 of FIG. In FIG. 5, the damping member 16 is shown by a dotted line.

In the fourth embodiment, the thickness of the portion 14c of the conductive member 14 covered by the damping member 16 is not changed, but the width of the portion 14c is increased and the width direction is divided into a plurality of parts. The surface area of this portion 14c is increased as a plurality of thin linear shapes.

In the fourth embodiment, the part 1
Of course, the thickness of 4c may be reduced as in the third embodiment.

According to the third and fourth embodiments, since the contact area where the vibration damping member 16 and the conductive member 14 generate friction increases, the vibration energy of the operation sound by the vibration damping member 16 is increased. The absorption effect is increased, and the transmission of the operation sound to the external terminal portion 18 can be further reduced.

[0042]

As described above, according to the present invention, it is possible to realize a silent type double case structure electromagnetic relay which has a small number of parts and is easy to manufacture including automation.

[Brief description of drawings]

FIG. 1 is a cross-sectional view for explaining a first embodiment of an electromagnetic relay according to the present invention.

FIG. 2 is a diagram for explaining a part of the first embodiment of the electromagnetic relay according to the present invention.

FIG. 3 is a sectional view for explaining a second embodiment of an electromagnetic relay according to the present invention.

FIG. 4 is a diagram showing a main part of a third embodiment of an electromagnetic relay according to the present invention.

FIG. 5 is a diagram showing a main part of a fourth embodiment of an electromagnetic relay according to the present invention.

FIG. 6 is a cross-sectional view illustrating a conventional electromagnetic relay.

[Explanation of symbols]

11 First Case 12 Second Case 13 Terminal Plate 14 Conductive Member 14c Part of Conductive Member 14 Covered by Damping Member 16 Terminal Part of Electromagnetic Relay Main Body 16 Damping Member 17 With Terminal Part 15 of Conductive Member 14 Coupling portion 18 External terminal portions 21 and 22 of the conductive member 14 Elastic member

Claims (3)

[Claims] 1. A first case in which an electromagnetic relay main body is housed, a second case in which a part is an opening and the first case is housed, and the opening in the second case is closed. Then, the terminal plate for hermetically sealing the second case and the terminal part of the electromagnetic relay body are coupled, and the end part is exposed to the outside through the terminal plate and the external terminal. A conductive member, a damping member that covers a portion of the conductive member between the terminal portion of the electromagnetic relay body and the terminal plate in the second case, and the first case is An electromagnetic relay comprising: a second case; and a support unit that supports the second case in a non-contact state with the terminal plate. 2. The conductive member is composed of a rigid member,
The electromagnetic relay according to claim 1, wherein the supporting means is configured by fixing the rigid conductive member at a portion of the terminal plate. 3. The electromagnetic relay according to claim 1, wherein the supporting means supports the first case with a second case via an elastic member.