JP2014035878A - Fuse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive fuse with a degree of freedom in design of a fusible part enlarged.SOLUTION: A fuse 11 comprises: a fuse element 13 in which respective outside expansion parts of a pair of expansion terminal parts connected via a fusible part 19 are folded and overlaid on inside expansion parts into a pair of flat-plate terminal parts; an outside notch 23 formed at the outside expansion part of one expansion terminal part; an inside notch formed at the inside expansion part of the other expansion terminal part; a pair of insulation housings 15 holding the fuse element 13 from top and rear face sides to cover an inner edge 57 and an upper edge 59 of each of the flat-plate terminal parts 17 and the fusible part 19, and nipped by the fuse element 13 by locking a locking claw 39 and a lock engaging part 37 provided one of the housing with the lock engaging part 37 and the locking claw 39 of the other housing; and element fixing protrusions 49 projecting on respective nipping faces 47 of the pair of insulation housings 15, and engaged with the outside notches 23 or the inside notches of the opposed flat-plate terminal parts 17.

Description

  The present invention relates to a fuse in which a fuse element including a pair of flat terminal portions connected via a fusible portion is covered with an insulating housing.

For example, Patent Document 1 discloses a fuse in which a fuse element including a pair of flat plate terminal portions connected via a fusible portion is covered with an insulating cover.
As shown in FIG. 9, the fuse 501 includes a fuse element 509 in which a fusible portion 507 is provided between inner edges 505 of a pair of parallel plate terminal portions 503, an inner edge 505 and an upper end of the plate terminal portion 503. A substantially T-shaped insulating housing 513 covering the edge 511 and the fusible portion 507. The fusible portion 507 extends from the connecting portion with the inner edge 505 of the flat plate terminal portion 503 toward the lower end edge side, and then bends toward the upper end edge side. It comprises a connecting part 517 that connects the upper ends of the parts 515 to each other. The insulating housing 513 is extended from the upper edge side toward the lower edge side along the inner edge 505 of the flat terminal portion 503, thereby extending the extending portion 515 of the fusible portion 507 and the inner edge 505 of the flat terminal portion 503. Insulating partition walls 519 for partitioning between them are provided.

  The fuse element 509 has a plate thickness that matches the specifications of the connection counterpart, such as a fuse box, and the fusible portion 507 is made of a thin material by thinning plastic working such as cutting or forging. In addition, the fuse element 509 is fixed to the insulating housing 513 by being inserted into the insulating housing 513 and then heat-welding the through hole at the round hole 521 of the insulating housing 513.

  According to the fuse 501, since the extending portion 515 of the fusible portion 507 extends toward the lower end edge 523, the space between the fusible portion 507 and the insulating partition 519 is wider than in the conventional case, and the heat generation of the fusible portion 507. Can be less affected by The insulating partition 519 can extend the tip portion to a connection point with the inner edge 505 of the extending portion 515 and extend the creeping distance between the flat plate terminal portions 503 by the insulating partition 519 to improve insulation. In addition, the holding strength of the fuse element 509 can be improved.

JP 2003-317604 A

  However, the fusible part 507 of the fuse 501 has a shape restriction because it is made by thinning a thick material necessary for the flat terminal part 503 by thinning plastic processing such as cutting or forging. There was a problem that the degree of freedom was low. Furthermore, the fixing structure of the insulating housing 513 and the fuse element 509 by heat welding requires a heat welding machine, which causes equipment costs, which causes an increase in manufacturing cost.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide an inexpensive fuse in which the degree of freedom in designing the fusible portion is expanded.

The above object of the present invention is achieved by the following configuration.
(1) A fuse element in which each outer developed part of a pair of developed terminal parts connected via a fusible part is folded into an inner developed part to form a pair of flat plate terminal parts, and one of the developed terminal parts An outer notch formed in the outer developed part, an inner notch formed in the inner developed part of the other developed terminal part, an inner edge and an upper edge of each flat terminal part, and the fusible part. A pair of insulating housings sandwiched between the fuse elements by sandwiching the fuse elements from the front and back sides, and locking the lock claws and lock engagement portions provided on the fuse elements to the counterpart lock engagement portions and lock claws. And an element fixing protrusion that protrudes from each sandwiching surface of the pair of insulating housings and engages with an outer notch or an inner notch of the flat plate terminal portion facing each other. fuse.

  According to the fuse having the configuration (1), the element fixing protrusion formed on the insulating housing is engaged with the outer notch and the inner notch formed on the fuse element, and the pair of flat plate terminal portions are sandwiched from the front and back sides. The pair of insulating housings are supported and fixed with high strength without rattling. Thereby, the stress applied to the fusible part is suppressed when the fuse is inserted and removed or when the vehicle vibrates, and deformation of the fusible part is prevented. Further, it is not necessary to fix the fuse element to the insulating housing by post-processing by heat welding. Further, the outer developed part of the pair of developed terminal parts connected via the fusible part is folded on the inner developed part to form a flat terminal part, and the outer notch and the inner notch are pressed by the developed terminal part. Since it can be stamped, it can be easily molded, cutting or thickness reduction is not required, and the design freedom of the fusible part can be expanded. And since heat welding, cutting, or thickness reduction processing becomes unnecessary, manufacturing cost can be reduced.

(2) The fuse having the configuration of (1), wherein the fuse elements are formed in line symmetry, and an outer notch formed in one of the flat plate terminal portions and an inner cutout formed in the other flat plate terminal portion, Is disposed on the opposite side of each of the pair of flat plate terminal portions.

  According to the fuse having the above configuration (2), the outer notch and the inner notch are located on the left and right sides on the front and back surfaces of the fuse elements facing the front and back insulating housings. Element fixing protrusions that engage with the inner notch can be formed on the left and right sides of the sandwiching surface of the insulating housing. As a result, it is possible to use insulating housings having the same shape on the front and back sides of the fuse element, and the manufacturing cost can be reduced.

  According to the fuse of the present invention, it is possible to prevent the fusible part from being deformed and to increase the design freedom of the fusible part and to reduce the cost.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

1 is an overall perspective view of a fuse according to an embodiment of the present invention. It is a disassembled perspective view of the fuse shown in FIG. FIG. 3 is an overall perspective view of the fuse element shown in FIG. 2. (A) And (b) is the front view and back view of a fuse element which were shown in FIG. FIG. 4 is a developed plan view of the fuse element shown in FIG. 3 before bending. It is the perspective view which looked at the insulating housing shown in FIG. 2 from the clamping surface side. (A) is a front view of the fuse shown in FIG. 1, (b) is an AA sectional view of the fuse shown in (a). It is BB sectional drawing of the fuse shown in FIG.7 (b). (A) is the whole perspective view of the conventional fuse, (b) is sectional drawing of the fuse shown to (a).

Embodiments according to the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, the fuse 11 according to the present embodiment is roughly divided into a fuse element 13 and an insulating housing 15.

  The fuse element 13 is die-formed by press working using a conductive metal base plate as a material, and then formed into a shape shown in FIG. 3 by bending. The fuse element 13 after being formed is connected to the pair of flat plate terminal portions 17 via the fusible portion 19. The fusible part 19 is connected to the left and right flat-plate terminal parts 17 by a pair of connection bars 21 formed in a substantially circular shape and extending from both ends in the diameter direction. The fuse element 13 is provided with a U-shaped outer notch 23 in one flat terminal portion 17 (left side in FIG. 3) in the front view shown in FIG. 4A, and in the rear view shown in FIG. 4B. A U-shaped inner notch 25 is provided on the other flat terminal portion 17 (right side in FIG. 3).

  The outer notch 23 and the inner notch 25 are not limited to one place as in the present embodiment, and the extension structure of the fusible portion 19 can be extended. That is, the outline of the connection bar 21 may be continuous with the U-shaped outline of the outer notch 23 and the inner notch 25. In the present embodiment, the outer notch 23 and the inner notch 25 are formed as U-shaped notches, but the outer notch 23 and the inner notch 25 may be formed as closed holes.

  The fuse element 13 is obtained by bending a developed base plate punched into the outer shape shown in FIG. The unfolded base plate is formed with a connecting bar 21 on the left and right sides with a fusible portion 19 at the center, and a developing terminal portion 27 connected to the connecting bar 21. As for each expansion | deployment terminal part 27, the outer side becomes the outer side expansion part 29, and the inner side connected to the connection bar 21 becomes the inner side expansion part 31. FIG. The fuse element 13 is bent tightly so that each outer developed portion 29 of the pair of developed terminal portions 27 is double-folded on the inner developed portion 31 via the fusible portion 19, and the pair of the fuse elements 13 shown in FIG. The flat plate terminal portion 17 becomes.

  Here, an outer notch 23 is formed in the outer developed part 29 of one of the developed terminal parts 27, and an inner notch 25 is formed in the inner developed part 31 of the other developed terminal part 27. As shown in FIG. 4, the fuse element 13 is formed symmetrically with respect to the left and right with a center line 33 passing through the center of the fusible part 19. In this line symmetrical shape, the outer notch 23 formed in one flat terminal portion 17 and the inner notch 25 formed in the other flat terminal portion 17 are opposite to the front and back surfaces of the pair of flat terminal portions 17. Is arranged.

A pair of insulating housings 15 are sandwiched between the fuse element 13 from the front and back sides. The insulating housing 15 is integrally formed of a translucent insulating synthetic resin having a predetermined color and has a substantially T shape in front view covering the inner edge 57, the upper edge 59 and the fusible part 19 of each flat terminal portion 17. .
As shown in FIG. 6, lock engagement portions 37 are provided on one side of the left and right ends of the insulating housing upper portion 35, and lock claws 39 are provided on the other side. In other words, the pair of insulating housings 15 sandwich the pair of flat plate terminal portions 17 from the front and back sides, and engage the lock claws 39 and the lock engagement portions 37 provided on the respective sides with the lock engagement portions 37 and the lock claws 39 on the other side. The fuse element 13 is clamped.

  In the present embodiment, a boss 43 is further provided on one of the left and right sides of the insulating housing lower portion 41, and a boss receiving hole 45 is provided on the other left and right. The pair of insulating housings 15 are sandwiched between the fuse elements 13 without misalignment with each other by press-fitting and fixing the bosses 43 and the boss receiving holes 45 when sandwiched.

  As shown in FIG. 6, an element fixing projection 49 is provided on each clamping surface 47 of the pair of insulating housings 15. As shown in FIG. 8, the element fixing projection 49 engages with the outer notch 23 or the inner notch 25 of the flat plate terminal portion 17 facing each other. When the outer notch 23 and one element fixing projection 49 are engaged, and the inner notch 25 and the other element fixing projection 49 are engaged, the insulating housing 15 and the fuse element 13 are moved in the vertical direction in FIG. Relative movement is restricted.

  As shown in FIG. 6, the pair of insulating housings 15 has a fuse housing space 51 formed at the center. The fusible portion 19 formed in the fuse element 13 is disposed in the fuse accommodating space 51. The fusible part 19 covered with the translucent insulating housing 15 can be easily visually recognized from the outside in terms of connection / melting.

  As shown in FIG. 1, the insulating housing upper portion 35 has a jig engaging step 55. The jig engaging step portion 55 is a portion to which a fuse removal jig (not shown) is engaged when the fuse 11 attached to a fuse attachment portion (not shown) is removed.

  In the fuse 11 of this embodiment, the inner edge 57 and the upper edge 59 of each flat terminal portion 17 are covered with the insulating housing 15 together with the fusible portion 19. As a result, the fuse element 13 has a portion that largely protrudes outward from the insulating housing 15, and the fuse 11 itself has a substantially rectangular shape when viewed from the front. In this way, the fuse element 13 in which the flat terminal portions 17 projecting from the insulating housing 15 are reduced is difficult to contact with each other even when a plurality of fuses 11 are in contact with each other at the time of transportation or the like. Therefore, it is possible to prevent the flat terminal portion 17 itself from being damaged or the external force from being applied to the fusible portion 19 from being deformed or damaged.

Next, the operation of the fuse 11 having the above configuration will be described.
In the fuse 11 of the present embodiment, the element fixing protrusion 49 formed on the insulating housing 15 is engaged with the outer notch 23 and the inner notch 25 formed on the fuse element 13, and the pair of flat plate terminal portions 17 are sandwiched from the front and back. The pair of insulating housings 15 are supported and fixed with high strength without rattling. That is, as shown in FIG. 8, the relative movement in the vertical direction between the insulating housing 15 and the fuse element 13 is reliably restricted. As a result, when the fuse 11 is inserted and removed or when the vehicle vibrates, the stress applied to the fusible part 19 is suppressed, and deformation of the fusible part 19 is prevented.

In addition, according to the fuse 11 of the present embodiment, the pair of insulating housings 15 sandwich the fuse element 13 from the front and back sides so as to cover the pair of flat plate terminal portions 17, and the lock claws 39 and the lock members provided respectively. The portion 37 is engaged with the counterpart lock engagement portion 37 and the lock claw 39 and is sandwiched between the fuse elements 13. Therefore, it is not necessary to fix the fuse element 13 to the insulating housing 15 by post-processing by heat welding.
Further, the outer developed portion 29 of the pair of developed terminal portions 27 connected via the fusible portion 19 is double-folded on the inner developed portion 31 to form the flat plate terminal portion 17, and the developed terminal portion 27. In addition, since the outer notch 23 and the inner notch 25 can be stamped by a press, they can be easily formed, and cutting or thickness reduction is not required, and the design flexibility of the fusible portion 19 can be expanded. And since heat welding, cutting, or thickness reduction processing becomes unnecessary, manufacturing cost can be reduced.

  Furthermore, according to the fuse 11 of the present embodiment, the outer notch 23 and the inner notch 25 are located on the same left and right sides on the front and back surfaces of the fuse element 13 facing the front and back insulating housings 15. The element fixing protrusions 49 that engage with the outer notch 23 and the inner notch 25 can be formed on the left and right sides of the sandwiching surface 47 of the insulating housing 15. As a result, the insulating housing 15 having the same shape can be used on the front and back of the fuse element 13, and the manufacturing cost can be reduced by sharing the parts.

Therefore, according to the fuse 11 according to the present embodiment, it is possible to prevent the fusible part 19 from being deformed and to increase the design freedom of the fusible part 19 to be inexpensive.
The fuse of the present invention is not limited to the above-described embodiment, and can be appropriately modified and improved. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

DESCRIPTION OF SYMBOLS 11 ... Fuse 13 ... Fuse element 15 ... Insulating housing 17 ... Flat plate terminal part 19 ... Soluble part 23 ... Outer notch 25 ... Inner notch 27 ... Deployment terminal part 29 ... Outer deployment part 31 ... Inner deployment part 37 ... Lock engagement part 39 ... Lock claw 47 ... Clamping surface 49 ... Element fixing protrusion 57 ... Inner edge 59 ... Upper edge

Claims (2)

A fuse element in which each outer developed part of a pair of developed terminal parts connected via a fusible part is folded into an inner developed part to form a pair of flat terminal parts;
An outer notch formed in the outer developed part of one of the developed terminal parts,
An inner notch formed in the inner developed part of the other developed terminal part,
The fuse element is sandwiched from the front and back sides so as to cover the inner edge and upper edge of each flat terminal part and the fusible part, and the lock claw and the lock engaging part provided on each of the fuse elements are respectively connected to the lock engaging part and the lock on the other side. A pair of insulating housings that are latched by the claws and sandwiched between the fuse elements;
An element fixing protrusion that protrudes from each sandwiching surface of the pair of insulating housings and engages an outer notch or an inner notch of the flat plate terminal portion facing each other;
A fuse characterized by comprising. The fuse elements are formed in line symmetry,
An outer notch formed in one of the flat plate terminal portions and an inner cutout formed in the other flat plate terminal portion are disposed on the front and back opposite surfaces of each of the pair of flat plate terminal portions. The fuse according to claim 1.

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