JP2006339067A - Electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a relay provided with a fuse capable of visually confirming whether the fuse is blown out or not, and preventing a circuit from short-circuit caused by fusion dust generated when the fuse is blown out. <P>SOLUTION: It is made possible to visually confirm whether the fuse is blown out or not, and a current conducting circuit is prevented from short-circuit caused by the fusion dust generated when the fuse is blown out by arranging the fuse 24 outside relay cases 11, 12. An installation space of the fuse 24 is reduced by forming the fuse 24 into a plate shape, and by welding the fuse 24 to a second terminal 13 and a movable terminal 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electromagnetic relay that opens and closes an energization circuit, and is suitable for an electromagnetic relay mounted on a vehicle.

Conventionally, as an electromagnetic relay with a fuse (hereinafter referred to as a relay), a movable connecting piece that can be opened and closed between two fixed contacts and an electromagnetic coil that drives the movable connecting piece are provided, and a part of the movable connecting piece is a fuse. A relay has been proposed (see, for example, Patent Document 1).
JP 2002-324478 A

  However, in the relay described in Patent Document 1, since the movable connecting piece that also serves as a fuse is housed in a relay case together with the electromagnetic coil that drives the relay, it is possible to visually check whether or not the fuse has melted. In addition, the circuit could be short-circuited by blown dust when the fuse was blown.

  In view of the above points, the present invention makes it possible to visually check whether or not a fuse is blown in a relay with a fuse and to prevent a short circuit of a circuit due to blown dust when the fuse is blown. Objective.

  In order to achieve the above object, according to the first aspect of the present invention, the relay case (10, 11) and the electromagnetic coil (14) that is housed in the relay case (10, 11) and generates electromagnetic force when energized. And a first terminal (12) whose one end protrudes from the relay case (10, 11) and is connected to the electric load, and a second terminal (13) whose one end protrudes from the relay case (10, 11) and is connected to the power source. ) And the first terminal (12) and the second terminal (13), and is housed in the relay case (10, 11) and attracted by the electromagnetic force of the electromagnetic coil (14). The movable contact (22) constitutes an energization circuit, and the energization circuit constitutes a fixed contact (21) that is housed in the relay case (10, 11) and contacts the movable contact (22). More than the value The fuse (24) is blown when the current flows, and the fuse (24) is disposed outside the relay case (10, 11) and is connected to the other component parts (13, 20) constituting the energizing circuit. It is characterized by being joined.

  According to this, since the fuse is disposed outside the relay case, it can be easily confirmed visually whether or not the fuse has melted.

  Moreover, since the fuse is disposed outside the relay case, it is possible to prevent a short circuit of the energization circuit due to blown dust when the fuse is blown.

  Moreover, since the fuse is joined to other components, the space for installing the fuse can be reduced as compared with the case where the fuse is fitted to the fuse terminal.

  According to a second aspect of the present invention, the relay according to the first aspect further includes a fuse case (25) attached to the relay case (10, 11) and covering the fuse (24). According to this, foreign matter intrusion into the relay case from the fuse side can be prevented.

  The invention according to claim 3 is the relay according to claim 2, wherein the fuse case (25) is made of a transparent material. According to this, it is possible to visually confirm whether or not the fuse has melted while the fuse case is mounted on the relay case.

  According to a fourth aspect of the present invention, in the relay according to any one of the first to third aspects, the first terminal (12) and the second terminal (13) are arranged from one end side of the relay case (10, 11). The fuse (24) protrudes and is arranged on the other end side of the relay case (10, 11).

  According to this, since the fuse is disposed on the opposite side of the surface to be mounted on the counterpart member (for example, relay box), it is easy to visually confirm whether or not the fuse has blown.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

  An embodiment of the present invention will be described. 1 is a front sectional view of a relay according to an embodiment of the present invention, FIG. 2 is a left side sectional view of the relay of FIG. 1, FIG. 3 is a plan sectional view of the relay of FIG. 5 is an exploded front cross-sectional view of the relay of FIG. 1, FIG. 6A is a front view of a fuse in the relay of FIG. 1, and FIG. 6B is a left side of the fuse of FIG. FIG. 6C is a plan view of the fuse of FIG. In addition, the up-down direction in a figure has shown the attitude | position in the state mounted in the vehicle etc.

  1 to 5, a bottomed cylindrical case 11 made of resin is fitted to a plate-like base 10 made of resin, and a space (hereinafter referred to as an internal space) is formed between the base 10 and the case 11. ) 10a is formed. The base 10 and the case 11 constitute a relay case of the present invention.

  One end of the base 10 protrudes from the base 10 and is connected to an electric load (not shown). The first terminal 12 is made of conductive metal, and one end protrudes from the base 10 and is connected to a power source (not shown). A metal second terminal 13, one end projecting from the base 10, two coil terminals 15 and 16 connected to the electromagnetic coil 14, and a yoke 17 are press-fitted and fixed.

  The electromagnetic coil 14 generates an electromagnetic force when energized, and a fixed iron core 18 made of a magnetic material is disposed in a central hole portion thereof. The electromagnetic coil 14 is fixed to the yoke 17.

  The yoke 17 is made of a magnetic material and has a conductivity. The yoke 17 forms a magnetic path of magnetic flux induced by the electromagnetic coil 14 and holds a conductive metal leaf spring 19 and a conductive metal movable terminal 20. To do.

  A fixed contact 21 made of conductive metal is caulked and fixed to an end portion of the first terminal 12 on the inner space 10a side. A movable contact 22 made of conductive metal is disposed opposite to the fixed contact 21.

  The movable contact 22 is caulked and fixed to the leaf spring 19, and the leaf spring 19 applies an elastic force to the movable contact 22 so that the movable contact 22 is separated from the fixed contact 21. A movable iron piece 23 made of a magnetic material attracted to the fixed iron core 18 is caulked and fixed to the leaf spring 19.

  Among the above components, the electromagnetic coil 14, the yoke 17, the fixed iron core 18, the leaf spring 19, the fixed contact 21, the movable contact 22, and the movable iron piece 23 are arranged in the internal space 10a. On the other hand, the 1st terminal 12, the 2nd terminal 13, and the two coil terminals 15 and 16 penetrate the base 10, and a part protrudes outside the internal space 10a. Further, the second terminal 13 and the movable terminal 20 pass through the wall surface of the case 11 on the side opposite to the base, and a part of the second terminal 13 and the movable terminal 20 protrudes from the internal space 10a.

  The second terminal 13 and the movable terminal 20 are connected outside the internal space 10a by a fuse 24 that blows when a current of a predetermined value or more flows. The fuse 24 is obtained by punching a conductive metal plate into a predetermined shape and bending it into a predetermined shape (details will be described later), and is joined to the second terminal 13 and the movable terminal 20 by welding or the like. Thereby, the second terminal 13 is electrically connected to the movable contact 22 via the fuse 24, the movable terminal 20, the yoke 17, and the leaf spring 19.

  On the opposite side of the case 11, a bottomed cylindrical fuse case 25 made of a transparent resin is fitted so as to cover the fuse 24.

  Next, the fuse 24 will be described with reference to FIG.

  One end of the fuse 24 has a first joint 241 joined to the second terminal 13, and the first joint 241 extends in the vertical direction in parallel with the second terminal 13. And a first support plate portion 2412 that is bent vertically from the lower end of the first joint plate portion 2411 and extends in the horizontal direction.

  The other end of the fuse 24 has a second joint 242 joined to the movable terminal 20, and the second joint 242 extends in the vertical direction in parallel with the movable terminal 20. 2421 and a second support plate portion 2422 that is bent vertically from the lower end of the second joint plate portion 2421 and extends in the horizontal direction.

  The first joint portion 241 and the second joint portion 242 are connected by a connecting portion 243 punched into an S shape in plan view. The current capacity of the fuse 24 is set by adjusting the plate thickness, width, and length of the connecting portion 243.

  When the fuse 24 is joined, first, the first joint 241 is in contact with the second terminal 13 and the second joint 242 is in contact with the movable terminal 20 so that the fuse 24 is connected to the case 11. The first joint plate portion 2411 and the second terminal 13 are welded by projection welding or the like, and the second joint plate portion 2421 and the movable terminal 20 are welded.

  When the fuse 24 is placed on the upper surface of the case 11, the position and posture of the fuse 24 are maintained by the first support plate portion 2412 and the second support plate portion 2422, so that the fuse 24 can be easily welded. .

  The relay having the above-described configuration is used by being mounted on, for example, a relay box. In this case, the first terminal 12, the second terminal 13, and the two coil terminals 15 and 16 are inserted into the female terminals of the relay box. .

  When the electromagnetic coil 14 is energized, the movable iron piece 23 is attracted to the fixed iron core 18 by the electromagnetic attraction force, and the movable contact 22 comes into contact with the fixed contact 21, so that the first terminal 12 and the second terminal 13 are connected. The energizing circuit to be connected is closed. On the other hand, when the energization of the electromagnetic coil 14 is interrupted, the movable contact 22 is separated from the fixed contact 21 by the elastic force of the leaf spring 19, so that the energization circuit connecting the first terminal 12 and the second terminal 13 is opened.

  In the present embodiment, since the fuse 24 is disposed outside the internal space 10a, that is, outside the case 11, it can be easily confirmed visually whether or not the fuse 24 has melted.

  Further, since the fuse 24 is disposed outside the case 11, it is possible to prevent a short circuit of the energization circuit due to blown dust when the fuse 24 is blown.

  Further, since the fuse 24 is covered with the fuse case 25, it is possible to prevent foreign matter from entering the case 11 from the fuse 24 side.

  Further, since the transparent fuse case 25 is used, it can be visually confirmed whether or not the fuse 24 is blown with the fuse case 25 attached to the case 11.

  Further, since the fuse 24 is arranged on the opposite side of the surface to be mounted on the counterpart member (for example, the relay box), it is easy to visually check whether or not the fuse 24 is blown.

  In addition, since the fuse 24 is a plate material and the fuse 24 is welded to the second terminal 13 and the movable terminal 20, the installation space for the fuse 24 is smaller than when the fuse is fitted to the fuse terminal. can do. Therefore, an increase in the dimension of the relay in the height direction when the fuse 24 is integrated with the relay can be reduced.

It is front sectional drawing of the relay which concerns on one Embodiment of this invention. FIG. 2 is a left side cross-sectional view of the relay of FIG. 1. FIG. 2 is a plan sectional view of the relay of FIG. 1. It is a bottom view of the relay of FIG. It is front sectional drawing which decomposes | disassembles and shows the relay of FIG. (A) is a front view of the fuse in the relay of FIG. 1, (b) is a left side view of the fuse of (a), and (c) is a plan view of the fuse of (a).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Base which comprises a relay case, 11 ... Case which comprises a relay case, 12 ... 1st terminal, 13 ... 2nd terminal, 14 ... Electromagnetic coil, 21 ... Fixed contact, 22 ... Movable contact, 24 ... Fuse.

Claims (4)

Relay cases (10, 11);
An electromagnetic coil (14) housed in the relay case (10, 11) and generating electromagnetic force when energized;
A first terminal (12) having one end protruding from the relay case (10, 11) and connected to an electric load;
A second terminal (13) having one end protruding from the relay case (10, 11) and connected to a power source;
The energization circuit connecting the first terminal (12) and the second terminal (13) is configured, and is housed in the relay case (10, 11) and is attracted by the electromagnetic force of the electromagnetic coil (14). Movable contact (22),
A fixed contact (21) that constitutes the energization circuit and is housed in the relay case (10, 11) and contacts and separates the movable contact (22);
A fuse (24) that constitutes the energization circuit and blows when a current of a predetermined value or more flows;
The electromagnetic relay, wherein the fuse (24) is disposed outside the relay case (10, 11) and joined to other components (13, 20) constituting the energization circuit. The electromagnetic relay according to claim 1, further comprising a fuse case (25) attached to the relay case (10, 11) and covering the fuse (24). The electromagnetic relay according to claim 2, wherein the fuse case is made of a transparent material. The first terminal (12) and the second terminal (13) protrude from one end side of the relay case (10, 11),
The electromagnetic relay according to any one of claims 1 to 3, wherein the fuse (24) is disposed on the other end side of the relay case (10, 11).

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