JP2003317604A - Fuse - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a good-quality fuse capable of improving an insulation property while being miniaturized. <P>SOLUTION: The fuse 20 is provided with a fuse element 25 with a soluble part 22 fitted between inner side edges 21a of a pair of flat terminal parts 21, 21 and an insulation housing 23 of nearly a T shape covering the inner side edges 21a, top end edges 21b and the soluble part 22 of each flat terminal part 21. The soluble part 22 consists of a pair of extended parts 27, 27 formed in curving toward a top end edge side after being extended from a linking place with the inner side edges 21a of each flat terminal part 21, and a linking part 28 linking the top ends of the extended parts 27, 27. The insulation housing 23 is provided with an insulating partition wall 24c partitioning between the extended parts 27 of the soluble part 22 and the inner side edges 21a of each flat terminal part 21 by being extended from the top end side toward a lower end side along the inner side edges 21a of each flat terminal part 21. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuse, and more particularly, to a fuse element in which a fusible portion is provided between a pair of parallel plate terminal portions in an insulating housing. It relates to the attached blade type fuse. 2. Description of the Related Art The voltage value of electric power transmitted through a power transmission line of a vehicle is 14V (volt) for a general passenger car, and 14 × for a large vehicle such as a bus or truck.
2 = 28V (both effective voltage values) has been the mainstream so far, but in passenger cars in particular, higher voltage values than ever before (due to demands for improving the drive efficiency of the load and driving at the optimum efficiency for each load) The adoption of a power supply system for supplying 42V) has started. In addition, in the above-described power transmission line, an electrical connection box (for example, a fuse block) in which a large number of fuses can be inserted and removed is used in order to protect electrical circuits of various electrical components. Yes. As the fuse used in the electrical junction box, for example, the fuse 1 shown in FIG.
There is zero. The fuse 10 illustrated in FIG. 4 is a low profile type in which a fuse element 15 having a fusible portion 12 provided between a pair of parallel flat terminal portions 11 and 11 is housed in an insulating housing 13. This is a blade type fuse.
Each of the flat terminal portions 11 has a substantially rectangular shape, and the inner edges 11 of the flat terminal portions 11 and 11 that face each other.
The soluble portion 12 is provided with a predetermined cross-sectional area so as to be laid across between a and 11a. The soluble part 12
Is a pair of extending portions 1 that are bent from the connecting portion with the inner edge 11a of each flat terminal portion 11 toward the upper edge side.
7 and 17 and a connecting portion 18 for connecting the upper ends of the extending portions 17 and 17 to each other. The insulating housing 13 includes a pair of housing main bodies 14a and 14a having a substantially T-shape and an upper wall portion 14b for connecting the upper ends of the housing main bodies 14a and 14a to each other. The fuse element 15 inserted from the slit opening is accommodated and held in a state where the inner edge 11a, the upper end edge 11b, and the fusible portion 12 of each flat plate terminal portion 11 are covered. Further, the upper wall portion 1 of the insulating housing 13 is used.
In 4b, a pair of insulating partition walls 14c and 14c are extended from the upper end edge 11b side toward the lower end edge 11e side along the inner edge 11a of each flat plate terminal portion 11, and each of the soluble portions 12 is The extending portion 17 and the inner edge 1 of each flat terminal portion 11
1a is partitioned by these insulating partition walls 14c and 14c. That is, the fuse element 15 of the fuse 10 has a region other than the front and back regions extending from the outer edge 11d and lower end edge 11e of each flat terminal portion 11 to the intermediate portion 11f located on the side of the fusible portion 12. Covered by an insulating housing 13. And the intermediate part 11f of each said flat terminal part 11 is electrically connected to this other party terminal by being pinched and fixed to the other party terminal of the fuse mounting part in the electrical connection box which is not shown in figure. Further, the fuse 10 has a pair of insulating partition walls 14c and 14c provided in the insulating housing 13 to extend the creeping distance between the parallel flat terminal portions 11 and 11, thereby improving the insulation. At the same time, the holding strength of the fuse element 15 is ensured. Further, the fuse 10 is prevented by the insulating partition walls 14c and 14c from causing the fusible portion 12 melted by overcurrent to be scattered into the insulating housing 13 and causing a secondary short circuit. Incidentally, the fuse 10 as shown in FIG. 4 is desired to be further reduced in size in accordance with the reduction in size and weight of the electrical junction box. The size tends to be smaller. Therefore, a pair of insulating partition walls 14c and 14c provided in the insulating housing 13 is provided.
Is close to the soluble part 12, the soluble part 1 during energization
2 may be melted by heat generation, and each insulating partition 14
The inner edge 11 that is the base of each of the extending portions 17 is the tip of c.
It was not possible to extend to the connection point with a. In particular, when the fuse 10 is used in a power transmission line to which high voltage power is supplied, the fusible portion 12 at the time of fusing scatters vigorously. It is necessary to further improve the insulation between the flat terminal portions 11 and 11 by the insulating partition wall 14c. Accordingly, an object of the present invention is to solve the above-described problems, and to provide a good fuse capable of improving insulation while reducing the size. The above object of the present invention is to provide a fuse element in which a fusible portion is provided between the inner edges of a pair of parallel plate terminal portions, and the inner edge of each plate terminal portion. And a substantially T-shaped insulating housing that covers the upper edge and the fusible part, wherein the fusible part extends from the connecting portion with the inner edge of each flat plate terminal part toward the lower edge. And a pair of extending portions that are bent toward the upper edge side, and a connecting portion that connects the upper ends of the extending portions to each other. It is provided with an insulating partition partitioning between the extending portion of the soluble portion and the inner edge of each flat plate terminal portion by extending from the upper end edge side toward the lower end edge side along the inner edge. Achieved by the featured fuse. According to the above configuration, each extending portion of the fusible portion of the fuse element covered by the insulating housing is
After extending toward the lower edge from the connection point with the inner edge of each flat terminal part, it is bent toward the upper edge, so it is provided in the insulating housing compared to the fusible part in the conventional fuse. The space between the insulating partition walls is widened, so that it is difficult to be affected by the heat generated by the soluble portion. Accordingly, each of the insulating partition walls can be extended to the connecting portion with the inner edge which is the base of each of the extending portions, and the creepage distance between the flat plate terminal portions by the insulating partition walls can be increased. It can be extended to improve insulation, and the holding strength of the fuse element can be improved. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fuse according to an embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an overall perspective view showing a fuse according to an embodiment of the present invention.
2 is a cross-sectional view of the fuse shown in FIG. 1, and FIG. 3 is an exploded view of the fuse shown in FIG. As shown in FIGS. 1 and 2, the fuse 20 of this embodiment has a pair of parallel flat terminal portions 21 and 21.
Fuse element 25 provided with a fusible part 22 between
Is a low-profile blade type fuse that is housed in an insulating housing 23. As shown in FIGS. 2 and 3, each of the flat terminal portions 21 has a substantially rectangular shape, and the inner edges 2 of the flat terminal portions 21 and 21 that face each other.
The fusible portion 22 is provided with a predetermined cross-sectional area so as to be laid between 1a and 21a. The fusible portion 22 includes the flat plate terminal portions 21.
A pair of extending portions 27, 27 that are bent toward the upper end edge side after being extended from the connecting portion with the inner edge 21a to the lower end edge side, and the upper ends of these extending portions 27, 27 are mutually connected. And a connecting portion 28 connected to the. The insulating housing 23 is a pair of housing main bodies 2 having a substantially T-shape.
4a, 24a and these housing bodies 24a, 24a
The upper wall part 24b which connects the upper end of each other is provided. The fuse element 25 inserted from the slit opening on the lower end side of the insulating housing 23 has the following structure:
A flap 24d connected to the lower end edge of one housing body 24a via a thin hinge is rotated, and the locking projection 1
The inner edge 21a, the upper end edge 21b, and the fusible part 22 of each flat plate terminal portion 21 are accommodated and held in a state covered with an insulating housing 23. Further, as shown in FIG. 1, a jig engaging step 24e is provided at a portion of the insulating housing 23 covering the upper edge 21b of each flat terminal portion 21. As shown in FIG.
The jig engaging step 24e is a portion to which a fuse removal jig (not shown) is engaged when the fuse 20 mounted on the fuse mounting section is removed. Furthermore, the upper wall 2 of the insulating housing 23 is provided.
4b, as shown in FIGS. 2 and 3, a pair of insulating partition walls 24c, 24c are formed along the inner edge 21a of each flat terminal portion 21 from the upper edge 21b toward the lower edge 21e.
The extending portions 27 of the fusible portion 22 and the inner edges 21a of the flat plate terminal portions 21 are partitioned by the insulating partition walls 24c and 24c. That is, as shown in FIG. 1, the fuse element 25 of the fuse 20 has an intermediate portion 21f located on the side of the fusible portion 22 from the outer edge 21d and lower end edge 21e of each flat terminal portion 21. The insulating housing 23 covers the areas other than the front and back surface areas. Therefore, according to the fuse 20 of this embodiment, as shown in FIG. 2, the inner edge 2 of each flat terminal portion 21 together with the fusible portion 22.
1a and the upper edge 21b are covered with the insulating housing 23, so that the fuse element 25 is connected to the insulating housing 2.
Thus, the tab terminal portion protruding greatly outward from 3 is eliminated, and the fuse 20 itself has a substantially rectangular shape in front view. Accordingly, the fuse element 25 having no tab terminal portion protruding from the insulating housing 23 is difficult to contact each other even when a plurality of fuses 20 are in contact with each other at the time of transportation or the like. Since it is difficult to receive external force, the flat terminal part 21 itself is damaged or the soluble part 2
2 can be prevented from being deformed or damaged by applying an external force. Further, according to the fuse 20 of this embodiment, as shown in FIG. 2, each extending portion 27 of the fusible portion 22 in the fuse element 25 covered by the insulating housing 23 is connected to each flat terminal. After extending toward the lower end edge 21e side from the connecting portion with the inner edge 21a of the portion 21, it is bent toward the upper end edge 21b side. there,
The fusible part 2 of the fuse element 25 in this embodiment.
2 is wider than the fusible part 12 in the conventional fuse 10 shown in FIG. 4, and the gap between the insulating partition walls 24 c provided in the insulating housing 23 is widened. It can be difficult to receive. That is, each of the insulating partitions 24c can be extended so that the front end portion is close to the connecting portion with the inner edge 21a that is the base of each of the extending portions 27. It can be longer than 14c. Therefore, according to the fuse 20 of the present embodiment, while improving the insulation by extending the creeping distance between the flat plate terminal portions 21 and 21 by the insulating partition 24c while reducing the size of the entire fuse, the fuse element 25 is held. The strength can be improved. It is needless to say that the structure of the fuse element and the insulating housing in the fuse of the present invention is not limited to the structure of the above-described embodiment, and can take various forms. According to the fuse of the present invention as described above, each extending portion of the fusible portion of the fuse element covered by the insulating housing is connected to the inner edge of each flat plate terminal portion. After extending toward the lower edge, it is bent toward the upper edge, so the distance between each insulating partition provided in the insulating housing is wider than the fusible part in the conventional fuse, It can be made less susceptible to the heat generated by the soluble part. Accordingly, each of the insulating partitions can be extended to the connecting portion with the inner edge which is the base of each of the extending portions, and the creepage distance between the flat plate terminal portions by the insulating partitions can be increased. It can be extended to improve insulation, and the holding strength of the fuse element can be improved. Therefore, it is possible to provide a good fuse capable of improving the insulation while reducing the size.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view showing a fuse according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the fuse shown in FIG. 3 is an exploded view of the fuse shown in FIG. 2. FIG. FIG. 4 is a cross-sectional view showing a conventional fuse. [Explanation of Symbols] 20 Fuse 21 Flat terminal 21a Inner edge 21b Upper edge 21d Outer edge 21e Lower edge 22 Soluble part 23 Insulating housing 24a Housing body 24b Upper wall part 24c Insulating partition wall 25 Fuse element 27 Extending part 28 Connecting part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Keiichi Ito             Toyota, Aichi Prefecture Toyota City 1 Toyota Toyota             Inside car company (72) Inventor Isao Yoneyama             Toyota, Aichi Prefecture Toyota City 1 Toyota Toyota             Inside car company (72) Inventor Satoshi Murakami             450, Sakaimachi, Ogaki-shi, Gifu Pacific Seiko Co., Ltd.             Within the company (72) Inventor Hideki Ando             450, Sakaimachi, Ogaki-shi, Gifu Pacific Seiko Co., Ltd.             Within the company (72) Inventor Norihiro Ohashi             204-1 Nunobikihara, Kashihara-cho, Kashihara-gun, Shizuoka Prefecture Yazaki             Parts Co., Ltd. (72) Inventor Hiroki Kondo             204-1 Nunobikihara, Kashihara-cho, Kashihara-gun, Shizuoka Prefecture Yazaki             Parts Co., Ltd. (72) Inventor Takayoshi Endo             204-1 Nunobikihara, Kashihara-cho, Kashihara-gun, Shizuoka Prefecture Yazaki             Parts Co., Ltd. (72) Inventor             159-1 Kaminokiri, Fukutake-machi, Toyota, Aichi Prefecture             Within Yazaki Corporation F-term (reference) 5G502 AA01 BA05 BB05 BB07 BC05                       BD09

Claims (1)

What is claimed is: 1. A fuse element having a fusible portion provided between inner edges of a pair of parallel plate terminal portions; an inner edge and an upper edge of each plate terminal portion; and the fusible portion. A fuse having a substantially T-shaped insulating housing that covers the inner edge of each of the flat plate terminal portions, the fuse portion extending toward the lower edge side, and then on the upper edge side. A pair of extending portions that are bent toward each other, and a connecting portion that connects the upper ends of these extending portions to each other, and the insulating housing extends from the upper edge side along the inner edge of each flat plate terminal portion. A fuse comprising an insulating partition that extends toward a lower end edge to partition between the extending portion of the fusible portion and the inner edge of each flat plate terminal portion.