JP2002324478A - Electromagnetic relay with fuse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify and miniaturize the structure of an electromagnetic relay with fuse. SOLUTION: This electromagnetic relay comprises first terminals 12a connected to the power source side, second terminals 12b connected to the load side, a movable connection piece 17 for enabling connection or disconnection between these terminals and an electromagnetic coil 16 for actuating connection or disconnection by the movable connection piece 17, and a part of the movable connection piece 17 is formed of a fuse part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay with a fuse, and its structure is simplified and downsized.

[0002]

2. Description of the Related Art Conventionally, in an electric wiring of an automobile, as shown in FIG. 4, an electromagnetic relay 3 for controlling power supply to the load 2 is provided between a battery 1 and a load 2 composed of various electric devices. And a fuse 4 for preventing the electric wiring and the load 2 from being damaged by an overcurrent. Since the fuse 4 and the electromagnetic relay 3 are formed of separate electric components, the electric connection box accommodating these electric components is also a factor for increasing the size.

In order to reduce the size by integrating the electromagnetic relay 3 and the fuse 4 into one electric component, Japanese Patent Application Laid-Open No. Sho 60-1480 discloses an electronic component.
An electromagnetic relay 5 described in Japanese Patent Publication No. 23 is known. As shown in FIGS. 5A and 5B, the electromagnetic relay 5 has a first
The terminal 6 and the second terminal 7, one end of which is fixed to the connection path of the second terminal 7, a movable connection piece 8 made of a spring piece, and the first terminal 6 An electromagnetic coil 9 is provided to allow the two terminals 7 to be connected to and separated from each other. The electromagnetic relay 5 has a structure in which a fuse function is also used by interposing a fuse portion 7a that blows at a required current value in an intermediate portion of the second terminal 7.

[0004]

The above-mentioned electromagnetic relay 5 has a structure in which a fuse function is also used. However, as a fuse portion 7a, a portion provided in a conventional fuse is added to the second terminal 7. Therefore, the second terminal 7 itself becomes large, and an extra space is required as a whole.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide an electromagnetic relay with a fuse having a fuse function without increasing or increasing the number of components as an electromagnetic relay. I have.

[0006]

In order to solve the above-mentioned problems, the present invention provides a first terminal connected to a power supply, a second terminal connected to a load, and the first and second terminals. A movable connection piece that can be opened and closed, and an electromagnetic coil that opens and closes the movable connection piece.
An electromagnetic relay with a fuse provided with a fuse that blows at a required current value or more in a connection path of a terminal, wherein a part of the movable connection piece is configured by a fuse portion. providing.

According to the above configuration, since only a part of the movable connection piece is constituted by the fuse portion, the movable connection piece itself does not become large due to the presence of the fuse portion, and is indispensable as an electromagnetic relay. An electromagnetic relay with a fuse can be configured using only the necessary components without increasing the number of components for the fuse section. Therefore,
The fuse function can be incorporated without increasing the size as compared with a normal electromagnetic relay, and the electric connection box does not increase in size even when housed in the electric connection box.

More specifically, the movable connection piece includes two first and second contacts at both ends thereof that can be connected to and separated from the first terminal and the second terminal, respectively. The parts are swingably held by spring pieces, respectively,
The fuse section is provided between the second contacts.
If the movable connection piece is a two-point contact type as described above, the intermediate portion having the fuse portion does not require a spring property, so that the fuse portion can be made of a normal zinc alloy without using a special material. .

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway front view of an electromagnetic relay with a fuse 11 according to the present invention. The electromagnetic relay with a fuse 11 includes a terminal portion 12, a switch portion 13, and a fuse 1.
4. The case 15 is provided. The terminal section 12 includes a first terminal 12a connected to the power supply side A, a second terminal 12b connected to the load side B, and a pair of coil terminals 12 connected to an electromagnetic coil 13a constituting the switch section 13.
c and 12d, both of which are fixed at required positions on an insulating substrate 15a forming the bottom of the case portion 15.

The switch unit 13 includes a coil terminal 12c,
An electromagnetic coil 16 connected and supported on both sides of the upper end of 12d;
It comprises a movable connection piece 17 operated by the magnetic force of the electromagnetic coil 16, and a first contact 12 a 1 and a second contact 12 b 1, the connection path of which is opened and closed by the contact of the movable connection piece 17. First terminal 12 introduced into case portion 15
a, the upper ends of the second terminals 12b are bent inward so as to be opposed to each other at positions near the electrodes at both ends of the electromagnetic coil 16 so as to be bent inward and separated on the same plane.
The first contact 12a1 and the second contact 12b1 protrude from the lower surfaces of the plane portions 12a2 and 12b2, respectively.

The movable connection piece 17 is a component of the switch section 13 and is also used as a component of the fuse section 14. That is, the movable connection piece 17 has a thin plate shape, and an intermediate portion constituting a part thereof is made of a zinc alloy, and is constituted by the fuse portion 14 that is blown when an overcurrent of a required current value or more is applied. Like that. The first contact 12a1 is provided on the upper surface of both ends of the movable connection piece 17.
Contact 17 that is opposed to the second contact 12b1
a and 17b are projected from each other. As shown in FIG. 2, a free end of a spring piece 18 fixed to both ends of the electromagnetic coil 16 is connected to both ends of the movable connection piece 17 to form the electromagnetic coil 1.
6, when the movable contacts 17a, 1
7b is elastically held in a state where it is slightly separated from the first contact point 12a1 and the second contact point 12b1. The switch unit 13 and the fuse unit 1 configured as described above
4 is a cover 15b fitted around the insulating substrate 15a.
It is covered with.

Next, the operation of the electromagnetic relay with fuse 11 having the above-described configuration will be described. As shown in FIG. 3, the first terminal 12a and the second terminal 12b are connected to the power supply side A and the load side B, respectively. Have been. When the electromagnetic coil 16 is not operated, the first contact 12a1 and the second contact 12a1 are actuated by the action of the spring piece 18 as shown in FIGS.
The movable contact 17a of the movable connection piece 17 with respect to the contact 12b1,
17b is in a separated state. Next, when power is supplied to the electromagnetic coil 16 to supply power to the load side B, FIG.
As shown in (A) and (B), the movable connecting piece 17 is drawn toward the electromagnetic coil 16 by the action of the electromagnetic force. As a result, the movable contacts 17a and 17b of the movable connection piece 17 contact the first contact 12a1 and the second contact 12b1, and the first terminal 12a and the second terminal 12b are connected via the movable connection piece 17. It is energized.

Here, if a trouble such as a short circuit occurs in the wiring path including the above-mentioned fused electromagnetic relay 11 and an overcurrent exceeding the set value of the fuse portion 14 occurs in the wiring path, the movable connection piece 17 Fuse section 14
Is blown, and the overcurrent is cut off. As described above, according to the present invention, the function of the relay and the function of the fuse are used together, so that the electromagnetic relay 11 with a fuse as a single component is used.
Thus, it is possible to perform an opening / closing operation of a circuit and an interruption operation when an overcurrent occurs. In addition, since the fuse portion 14 is included in a part of the movable connection piece 17 used for a normal relay, the number of components and the size of the main body itself are increased due to the combined use of functions as compared with a general relay. Nor.

In the above embodiment, the fuse 14
As an example, a zinc alloy is used. However, if the fuse portion is made of a material that can be blown off by heat and has a spring property, as a movable connection piece that connects the first terminal and the second terminal, A cantilevered switch structure in which one end is fixed to one of the terminals may be employed. When the fuse section is used under the condition of 30 A or more, the fuse section may be provided with a heat sink section.

[0015]

As is apparent from the above description, according to the present invention, since a part of the movable connecting piece is constituted by the fuse portion, the electromagnetic member provided with the fuse can be formed only by the components of a general relay. A relay can be configured. Therefore, the structure does not become complicated and the main body itself does not increase in size as the number of components increases.

[Brief description of the drawings]

1A is a partially cutaway front view of an electromagnetic relay with a fuse of the present invention, and FIG. 1B is a partially cutaway side view.

FIGS. 2A and 2B are diagrams showing an operation state of a movable connection piece.

FIG. 3 is a circuit diagram showing a use state of an electromagnetic relay with a fuse.

FIG. 4 is a circuit diagram showing a conventional example.

FIGS. 5A and 5B are diagrams showing a conventional electromagnetic relay with a fuse.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Electromagnetic relay with a fuse 12a 1st terminal 12a1 1st contact 12b 2nd terminal 12b1 2nd contact 14 Fuse part 16 Electromagnetic coil 17 Movable connection piece 18 Spring piece Power supply side A Load side B

Claims (2)

[Claims] 1. A first terminal connected to a power supply side, a second terminal connected to a load side, a movable connection piece capable of opening and closing the first terminal and the second terminal, and the movable connection piece. And an electromagnetic coil for opening and closing the first terminal and the second terminal.
An electromagnetic relay with a fuse provided with a fuse that blows at a required current value or more in a connection path of a terminal, wherein a part of the movable connection piece is configured by a fuse portion. 2. The movable connection piece includes two first and second contacts that can be respectively connected to and separated from the first terminal and the second terminal at both ends, and a portion of the first and second contacts is a spring piece. The electromagnetic relay with a fuse according to claim 1, wherein the fuse is held so as to be swingable, and the fuse portion is provided between the first and second contacts.