JP2010170890A - Fusible link - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fusible link for saving time for screwing by doing away with troubles of screwing and connector connection for connection to a base, contributing to reduction of assembling man-hour and downsizing of a product, and contributing to reduction of development cost and shortening of development time. <P>SOLUTION: The fusible link is structured of three components 10, 20, 30, each of which 10, 20, 30 includes conductor segments 11 to 13, 21 to 23, and 31 to 33, respectively, each constituting an H-letter shape in plane view, as well as power source terminal segments 14, 24, 25, 34 connected to either of the conductor segments. The component 20 includes a fuse element F fitted on its conductor segment, and that, the conductor segments 21, 23 making up both ends of the letter H are to be overlapped with either 13, 33 of the conductor segments making up both ends of the letter H, respectively, of the other two components 10, 30, in which state, resistance welding is carried out. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fusible link, and more particularly to a fusible link that can simplify the connection of a fusible link to a base (matrix).

<Conventional fuse 1 and its disadvantages>
Conventionally, a kit-cut fusible link (FL), a cartridge FL, or the like already exists as a separate fuse itself (Patent Document 1).
The fuse of FIG. 7 is an example thereof, and is composed of left and right connection terminals 71 and 72 having a fuse element F at the center of the conductor, and a connection hole is provided at the center of each terminal 71 and 72. When fuse elements F ′ having different ratings are used, connection terminals 710 and 720 for the fuse elements F ′ are designed.
In this way, the connection of the conventional fuse to the base (mother body) is screw tightening or connector connection, and the trouble of screw tightening and the size of the product become major issues, which become a barrier to assembly man-hours and downsizing of the product size. It was. Further, in response to a request for changing the fuse rating such as F to F ′, the press die frame and the die itself have to be changed.

<Conventional fuse 2 and its disadvantages>
On the other hand, it has also been proposed to connect the fuse to the base by welding (Patent Document 2).
However, since the fuse is manufactured by punching with a press die by a conventional method, the press die piece and the die itself have to be changed in response to a request for changing the fuse rating.
Moreover, the soluble body was exposed and had a problem in heat dissipation.
Moreover, the base on which the fuse is welded is specially designed for the fuse, and the versatility that can be appropriately selected according to the required fuse capacity has not been considered.

JP 2007-80709 A Japanese Utility Model No.3-1960

The present invention solves the above-mentioned problems, and it eliminates the need for screw tightening or connector connection to connect to a base such as a kit cut FL or cartridge FL, thereby eliminating the need for screw tightening and assembling man-hours and product size. The purpose is to provide a kit-cut fusible link that can contribute to the miniaturization of the product.
In addition, the kit-cut fusible link is divided into three parts, and each part is simplified as a simplified part to promote the generalization of fuse parts. This contributes to reducing development costs and development time, and reducing product size. The purpose is to provide a kit-cut fusible link that contributes to the realization of the system.

  In order to achieve the above object, a first invention is a fusible link constituted by three parts divided into three parts, wherein each of the parts constitutes an H-shape in plan view and the conductor segments A segment for a power supply terminal connected to one of them, one of the three parts has a fuse element on the conductor segment, and a conductor segment constituting both ends of the H-shaped ends of the H-shaped ends of the other two parts It is characterized in that it is resistance welded in a state where it is superposed on one of the conductor segments constituting the wire.

  According to a second aspect of the present invention, in the fusible link of the first aspect, the three parts are resin-molded, and at that time, the conductor segments constituting both ends of the H shape of the parts and the segment for the power supply terminal are exposed. It is characterized by this.

  A third invention is characterized in that, in the fusible link of the second invention, a window for visually recognizing the fuse element is formed at the time of resin molding on a part having the fuse element on a conductor segment. .

  According to a fourth aspect of the present invention, in the fusible link of the second aspect, a protrusion is formed on at least one of the conductor segments constituting both ends of the H-shape of each component.

  According to a fifth invention, in the fusible link of the fourth invention, the conductor segment is plated, and the plating is peeled off by the protrusion.

According to such a configuration, since parts can be connected by resistance welding, screw tightening or connector connection is not used for connection to the base of the kit cut FL, cartridge FL, etc., and therefore the labor of screw tightening can be omitted. This can contribute to assembly man-hours and product size reduction.
In addition, because the kit-cut fusible link is divided into three parts and each part is made into a simplified simplified part, the generalization of fuse parts is promoted, the development cost is shortened, the development time is shortened, and the product size is reduced. Can contribute to

The perspective view of the conductor which divided and divided the kit cut fusible link concerning the present invention into three parts, respectively, (a) is the base side 1st connection part, (b) is the fuse part, (c) is the base side It is a 2nd connection part. It is a perspective view explaining the external shape of each component of the kit cut fusible link divided into three, (a) base side first connection part, (b) fuse part, (c) base side second connection part. It is the front view and top view for demonstrating the height of the conductor of the 3 divided parts which concern on this invention, and the magnitude | size of a connection part. It is the front view and top view of 3 divided parts as a finished product which covered each conductor of Drawing 3 with resin. 4 is a front view of a kit-cut fusible link in which three parts are integrated by sliding and welding the conductor 20 of the fuse portion in FIG. 4 below the conductor 10 of the base-side first connection portion and the conductor 30 of the base-side second connection portion. It is a figure and a top view. It is a figure explaining the procedure of welding, (1) Before slide insertion, (2) is each sectional drawing after slide insertion. (3) is a perspective view explaining how to apply voltage. It is an example of the conventional fuse provided with the connection terminal at both ends.

Hereinafter, a kit-cut fusible link according to the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a conductor divided into three parts of a kit-cut fusible link according to the present invention, wherein (a) is a base-side first connection portion, (b) is a fuse portion, and (c). Is a base-side second connecting portion. Below, each conductor of a base side 1st connection part, a fuse part, and a base side 2nd connection part is demonstrated.

<Conductor of base side first connection part>
In FIG. 1 (a), reference numeral 10 denotes a conductor of the first base-side connecting portion constituting the kit-cut fusible link according to the present invention.
The conductor 10 of the base side first connection portion has an H-shape in a plan view including straight conductor segments 11 and 13 placed in parallel to each other and a straight conductor segment 12 connecting the midpoints of the straight conductor segments 11 and 13. Further, it is composed of a strip segment 14 that extends in parallel to the straight conductor segments 11 and 13 from the middle of the straight conductor segment 12.
And the conductor 10 of this base side 1st connection part is partially covered with resin K10 shown with a dotted line by insert molding. In the figure, the portion covered with the resin K10 is indicated by hatching, and the portion exposed without being covered is indicated by white. According to this, since the straight conductor segment 11 is a part welded to the base side, it is not covered with the resin K10. Further, the lower portion of the straight conductor segment 13 is a portion welded to the conductor 20 of the fuse portion, and therefore is not covered with the resin K10. Furthermore, since the strip segment 14 is a terminal to which a welding power source is applied, only the portion serving as the terminal is not covered with the resin K10. Other portions are protected because they are covered with the resin K10.

<Fuse conductor>
In FIG.1 (b), 20 is a conductor of the fuse part which comprises the kit cut fusible link which concerns on this invention.
The conductor 20 of the fuse portion has an H shape in a plan view including straight conductor segments 21 and 23 placed in parallel to each other and a straight conductor segment 22 that connects the midpoints of the straight conductor segments 21 and 23. A fuse element is formed by fixing a fusible element F to a portion 26 having a smaller cross-sectional area at the center of the conductor segment 22.
Further, a strip segment 24 extending in parallel with the straight conductor segment 21 at a position near the straight conductor segment 21 in the middle of the straight conductor segment 22, and a straight conductor segment 23 at a position near the straight conductor segment 23 in the middle of the straight conductor segment 22. And a strip segment 25 extending in parallel with each other.
And the conductor 20 of this fuse part is partially covered with resin K20 shown with a dotted line by insert molding. In the figure, a portion covered with the resin K20 is indicated by hatching, and a portion exposed without being covered is indicated by white. According to this, since the straight conductor segment 21 is a part welded to the conductor 10 of the base side first connection portion, it is not covered with the resin K20. Further, since the straight conductor segment 23 is also a portion welded to the conductor of the base-side second connection portion 30, it is not covered with the resin K20. Further, since the strip segment 24 is a terminal to which a welding power source is applied, only the portion of the terminal is not covered with the resin K20. Similarly, since the strip segment 25 is a terminal to which the welding power is applied, only the portion of the terminal is not covered with the resin K20. Other portions are covered with the resin K20 and have a protective function, and the fusible body is not exposed, so that heat dissipation is improved.

<Conductor of base side second connection part>
In FIG.1 (c), 30 is a conductor of the base side 2nd connection part which comprises the kit cut fusible link which concerns on this invention.
The conductor 30 of the base-side second connection portion has an H-shape in a plan view including straight conductor segments 31 and 33 placed parallel to each other and a straight conductor segment 32 that connects the midpoints of the straight conductor segments 31 and 33. Further, it is composed of a strip segment 34 extending in parallel to the straight conductor segments 31 and 33 from the middle of the straight conductor segment 32.
And the conductor 30 of this base side 2nd connection part is partially covered with resin K30 shown with a dotted line by insert molding. In the figure, a portion covered with the resin K30 is indicated by hatching, and a portion exposed without being covered is indicated by white. According to this, since the straight conductor segment 31 is a portion welded to the base side, it is not covered with the resin K30. Further, the lower portion of the straight conductor segment 33 is a portion welded to the fuse portion 20 and is not covered with the resin K30. Furthermore, since the strip segment 34 is a terminal to which a welding power source is applied, only the portion serving as the terminal is not covered with the resin K30. Other parts are covered and protected with resin K30.

  FIG. 2 is a perspective view for explaining the outer shape of each part of the kit-cut fusible link divided into three parts: (a) a base-side first connection portion, (b) a fuse portion, and (c) a base-side second connection portion. is there.

<Outline of base side first connection part>
In FIG. 2A, most of the conductor 10 of the base side first connection portion is covered with a resin K10. What is not covered is a straight conductor segment 11 welded to the base side, a straight conductor segment 21 welded to the straight conductor segment 21 of the conductor 20 of the fuse portion, and a strip segment serving as a terminal to which welding power is applied. 14.
At the time of welding, since the straight conductor segment 21 of the conductor 20 of the fuse portion slides from the side directly below the straight conductor segment 13, the straight conductor just below the straight conductor segment 13 so that the straight conductor segment 21 can slide. The resin K10 is not formed by the thickness of the segment 21.

<Outline of fuse part>
In FIG. 2B, most of the conductor 20 in the fuse portion is covered with resin K20. What is not covered is a straight conductor segment 21 welded to the straight conductor segment 13 of the conductor 10 of the base side first connection portion and a straight line welded to the straight conductor segment 33 of the conductor 30 of the base side second connection portion. They are a conductor segment 23, strip segments 24 and 25 serving as terminals to which a welding power source is applied, and a visual recognition window 20h for confirming whether or not the fusible body F of the fuse element is blown.

<Outline of base side second connection part>
In FIG. 2 (c), most of the conductor 30 of the base-side second connection portion is covered with a resin K30. What is not covered is a straight conductor segment 31 welded to the base side, a straight conductor segment 33 welded to the straight conductor segment 23 of the conductor 20 of the fuse portion, and a strip segment serving as a terminal to which a welding power source is applied. 34.
At the time of welding, the straight conductor segment 23 of the conductor 20 of the fuse portion slides from the side directly below the straight conductor segment 33, so that the straight conductor segment 23 can be slid and straightly below the straight conductor segment 33. The resin K30 is not formed by the thickness of the conductor segment 23.

FIG. 3 is a front view and a plan view for explaining the height of the conductor and the size of the connecting portion of the three-part component according to the present invention.
In FIG. 3, reference numeral 10 denotes a conductor of the base side first connection part, 20 denotes a conductor of the fuse part, and 30 denotes a conductor of the base side second connection part. The conductor 10 of the base side first connection part and the conductor 30 of the base side second connection part are located at the same height, and protrusions 13t and 33t protruding downward are formed by a punch or the like from the opposite side of the conductor. These protrusions 13t and 33t serve as welding points in resistance welding.
On the other hand, the conductor 20 of the fuse portion is slightly lower than the height of the conductor 10 of the base-side first connection portion and the conductor 30 of the base-side second connection portion. The fuse portion conductor 20 is positioned so that the projections 13t and 33t protruding below the conductor 30 of the base side second connection portion and the upper surface of the fuse portion conductor 20 rub against each other during sliding.
In the plan view of FIG. 3, the conductor 10 of the base side first connection portion is composed of straight conductor segments 11 to 13 that form an H shape and strip segments 14 that function as terminals during welding.
The conductor 20 of the fuse portion is composed of straight conductor segments 21 to 23 that form an H shape and strip segments 24 and 25 that function as terminals during welding.
The conductor 30 of the base-side second connection portion is composed of straight conductor segments 31 to 33 that form an H shape, and a strip segment 34 that functions as a terminal during welding.
At the time of welding, the linear conductor segment 21 of the conductor 20 of the fuse portion is overlapped under the straight conductor segment 13 of the conductor 10 of the base side first connection portion, and voltage is applied to the strip segment 14 and the strip segment 24 to apply the base. The conductor 10 of the side first connection portion and the conductor 20 of the fuse portion are overheated and welded by the protrusion 13t, and are electrically connected.
Similarly, the linear conductor segment 23 of the conductor 20 of the fuse portion is overlapped below the straight conductor segment 33 of the conductor 30 of the base side second connection portion, and voltage is applied to the strip segment 25 and the strip segment 34 to apply the base side. The conductor 30 of the second connection portion and the conductor 20 of the fuse portion are overheated and welded by the protrusion 33t, and are electrically connected.

FIG. 4 is a front view and a plan view of a three-part product as a finished product in which each conductor of FIG. 3 is covered with a resin.
In FIG. 4, most of the conductor 10 of the base side first connection portion is covered with the resin K10, but what is not covered is the linear conductor segment 11 welded to the base side and the conductor 20 of the fuse portion. It can be seen that the straight conductor segment 21 is welded to the straight conductor segment 13 and the strip segment 14 is a terminal to which a welding power source is applied.
The conductor 20 of the fuse portion is mostly covered with the resin K20, but is not covered with the linear conductor segment 21 welded to the linear conductor segment 13 of the conductor 10 of the base side first connection portion, and the base. Whether or not the straight conductor segment 33 to be welded to the straight conductor segment 33 of the conductor 30 of the second side connection portion, the strip segments 24 and 25 serving as terminals to which the welding power is applied, and the fuse element fusible body F It can be seen that this is the window 20h for confirming.
The conductor 30 of the base side second connection portion is mostly covered with the resin K30, but is not covered with the straight conductor segment 31 welded to the base side and the straight line of the conductor 20 of the fuse portion. It can be seen that the conductor segment 23 is a straight conductor segment 33 to be welded and a strip segment 34 to be a terminal to which a welding power source is applied.

FIG. 5 shows that the conductor 20 of the fuse part in FIG. 4 is slid under the conductor 10 of the base side first connection part and the conductor 30 of the base side second connection part and placed directly below, and then welded to integrate the three parts. It is the front view and top view of a kit cut fusible link which made it.
When the conductor 20 of the fuse portion is slid under the conductor 10 of the base side first connection portion, the straight conductor segment of the conductor 20 of the fuse portion is projected by the protrusion 13t of the straight conductor segment 13 of the conductor 10 of the base side first connection portion. 21 is rubbed, the plating is peeled off, and it becomes conductive. By applying a voltage to the strip segment 14 and the strip segment 24, the conductor 10 of the base side first connection portion and the conductor 20 of the fuse portion are welded to the projection 13t. It becomes a point and is resistance-welded and electrically connected.
Similarly, the linear conductor segment 23 of the conductor 20 of the fuse portion is rubbed by the protrusion 33t below the linear conductor segment 33 of the conductor 30 of the base-side second connection portion, becomes conductive, and voltage is applied to the strip segment 25 and the strip segment 34. Is added, and the conductor 30 of the base-side second connection portion and the conductor 20 of the fuse portion are resistance-welded and electrically connected to obtain a kit-cut fusible link in which three components are integrated.

FIGS. 6A and 6B are diagrams for explaining the welding procedure. FIG. 6A is a cross-sectional view of the structure before (1) before slide insertion and (2) after slide insertion. (3) is a perspective view explaining how to apply voltage.
6 (1), in a state before the straight conductor segment 21 of the conductor 20 of the fuse portion is slid and inserted under the straight conductor segment 13 of the conductor 10 of the first base connection portion (FIG. 4), the resin K20 The exposed linear conductor segment 21 has a plated layer M on copper (Cu), and the exposed linear conductor segment 13 from the resin K10 has a plated layer M on copper (Cu). Has been. Further, the straight conductor segment 13 has a protrusion 13t formed by punching on the straight conductor segment 21 side.
6 (2), after the linear conductor segment 21 of the conductor 20 of the fuse portion is slid and inserted under the linear conductor segment 13 of the conductor 10 of the base side first connection portion (FIG. 5), the linear conductor On the segment 21, the plating layer M is peeled off by the projection 13t of the straight conductor segment 13, and the copper (Cu) of both the straight conductor segments 21 and 13 are exposed and in contact with each other. In this state, resistance welding shown in FIG. 6 (3) is performed.
In FIG. 6 (3), the plating layer M between the straight conductor segment 21 of the conductor 20 of the fuse portion and the straight conductor segment 13 of the conductor 10 of the base-side first connection portion has already been peeled off by the protrusions 13 t, and both the straight conductor segments 21. , 13 are exposed and in contact with each other. When a voltage is applied between the terminal 14 and the terminal 24, the route indicated by the dotted line indicates that the terminal 14 → the segment 12 → the segment 13 → the segment 21 → the segment 22 → Electricity flows in the segment 24 (or vice versa depending on the polarity of the voltage), and vice versa in the next half cycle for alternating current. As a result, since the resistance at the projection 13t is large, this becomes a welding point and overheats to perform resistance welding. Other parts are not overheated, so there is no damage. In addition, it is good to design a fusible body considering the resistance value after welding of each connection part.
The same applies to the case of welding the straight conductor segment 23 of the conductor 20 of the fuse portion and the straight conductor segment 33 of the conductor 30 of the base-side second connection portion (see FIG. 5).

<Other side effects>
The terminal used when welding can then function as a radiator.
Further, unlike the conventional bare soluble material, in the present invention, the heat dissipation is improved because it is covered with resin.
Further, a secondary effect that a cover is unnecessary is obtained.

As described above, according to the present invention, since screw tightening or connector connection is not used for connection to the base of the kit cut FL, it is possible to eliminate the trouble of screw tightening and contribute to the reduction in assembly man-hours and product size. .
In addition, the kit-cut fusible link is divided into three parts to make each part independent and simplified, and the fuse itself is separated into several kinds, and is appropriately selected according to the required fuse capacity and divided into three parts. Since it may be combined with other parts and resistance welding is performed, it is possible to promote the generalization of fuse parts, contribute to shortening development costs and development time, and contributing to reducing the product size. Since the connection is welded after assembling, it is possible to eliminate the trouble of screw tightening and reduce the number of assembling steps.
Further, since the connection can be made with a small area for resistance welding, the conventional large connection terminal is not required, leading to a reduction in product size.

DESCRIPTION OF SYMBOLS 10 Conductor of base side 1st connection part 11-13 Linear conductor segment of base side 1st connection part 13t 33t Protrusion 14 Strip segment of base side 1st connection part K10 Resin 20 which covers conductor of base side 1st connection part Fuse Conductors 21 to 23 Linear conductor segments 24, 25 Fuse strip segments 20h Viewing window K20 Resin 30 covering the fuse conductors Base side second connection part 31-33 Base side second connection part 34 Linear segment of base-side second connecting portion K30 Resin F covering fuse of base-side second connecting portion M Fuseable element M Plating layer

Claims (5)

A fusible link comprising three parts divided into three parts, each of the parts comprising an H-shape in plan view and a segment for a power supply terminal connected to one of the conductor segments Prepared,
One of the three parts is provided with a fuse element on a conductor segment, and a conductor segment constituting both ends of the H-shape is superposed on one of the conductor segments constituting both ends of the H-shape of the other two parts. A fusible link characterized by resistance welding.   2. The fusible link according to claim 1, wherein the three parts are resin-molded, and at that time, a conductor segment and a segment for the power supply terminal constituting both ends of the H-shape of each part are exposed.   3. The fusible link according to claim 2, wherein a window for visually recognizing the fuse element is formed when resin molding is performed on a part having the fuse element on a conductor segment.   3. The fusible link according to claim 2, wherein a protrusion is formed on at least one of the conductor segments constituting both ends of the H-shape of each part.   The fusible link according to claim 4, wherein the conductor segment is plated, and the plating is peeled off by the protrusion.

Images