JP2011124033A - Fuse and fuse mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuse that can be formed almost without material loss, and can be miniaturized, and to provide a fuse mounting structure using the fuse. <P>SOLUTION: The fuse 1A includes a conductive fuse element 2 which has a pair of connector parts 2a that are formed by bending both end sides of conductive wire rod so as to be in parallel and a fusible part 2b that is formed between the pair of connector parts 2a with the cross-section area made smaller than that of the other part, and an insulating shape-holding member 3 which is fixed to the fuse element 2 and holds the shape of the fuse element 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fuse for preventing supply of overcurrent and a fuse mounting structure for mounting the fuse.

  As shown in FIGS. 9A and 9B, a conventional fuse 50 includes a fuse element 51 having a pair of connection terminal portions 51a and a fusible portion 51b disposed therebetween, and a pair of connection terminals. The shape holding member 52 covers the outer periphery of the fuse element 51 only by exposing a part of the portion 51 a and holds the shape of the fuse element 51. The fuse element 51 is formed by punching a flat plate of a conductive material with a press.

  FIG. 10 shows a conventional in-vehicle junction box 60 in which such a fuse 50 is mounted (see Patent Document 1). The in-vehicle junction box 60 has a circuit board 61 that forms a branch circuit for branching the power source from the battery or alternator to various loads, and is fixed to the circuit board 61, and is connected to the battery or alternator side or connected to various loads. Connectors 62 and 63 for fixing, and a fuse mounting portion 64 which is fixed to the substrate 61 and prevents overcurrent supply to each load.

  The fuse mounting portion 64 has a plurality of cavity chambers 65, and the fuse 50 is mounted in each cavity chamber 65. The width dimension W3 of the cavity chamber 65 is determined by the width W4 of the fuse 50 to be mounted.

JP 2006-333583 A

  However, the conventional fuse 50 has a problem that a large amount of material loss occurs because the fuse element 51 is formed by punching a flat plate with a press. Specifically, the region E in FIG. 9B is a material loss.

  In addition, since the conventional fuse 50 is connected to the both ends of the fusible portion 51b having a small cross-sectional area with the flat and wide connecting terminal portions 51a, the width of each connecting terminal portion 51a itself is increased. Accordingly, the shape holding member 52 that holds the shape of the fuse element 51, particularly the pair of connection terminal portions 51a, is also wide and complicated, and the dimension W4 of the fuse 50 is increased. For this reason, each cavity chamber 65 of the fuse mounting portion 64 becomes larger, which is a factor that increases the outermost shape of the in-vehicle junction box 60.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a fuse that can be formed with almost no material loss and can be reduced in size, and a fuse mounting structure using this fuse. And

  The invention of claim 1 is a fusible material formed by making the cross-sectional area smaller than other portions between a pair of connection terminal portions formed by bending both ends of a conductive wire and the pair of connection terminal portions. A fuse comprising: a conductive fuse element having a portion; and an insulating form holding member that is fixed to the fuse element and holds the form of the fuse element.

  A second aspect of the present invention is the fuse according to the first aspect, wherein the fusible portion of the fuse element has a bent shape.

  A third aspect of the invention is the fuse according to the first or second aspect, wherein the shape holding member has a locking portion that is locked by elastic deformation, and the fuse is accommodated using the locking portion. The fuse can be mounted in a box.

  According to a fourth aspect of the present invention, the fuse according to any one of the first to third aspects is housed in a fuse housing box having a plurality of cavity chambers partitioned by a partition wall. It is.

  According to the invention of claim 1, since the fuse element can be manufactured by cutting a conductive wire into a predetermined length and bending or crushing the cut wire, there is almost no material loss in the conductive wire. Can be made. Further, since the fuse element is a wire, the width of each connection terminal portion itself is narrow, the insulation holding member for holding the form of the fuse element may be narrow and simple, and the fuse can be miniaturized.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, a fuse having a low current value can be produced, and the width dimension of the fuse element can be further narrowed.

  According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, it can be securely attached to the fuse housing box so as not to fall off simply by inserting the fuse.

  According to the fourth aspect of the present invention, each fuse is small, and it is only necessary to form a small cavity chamber. Therefore, the fuse housing box can be downsized (low profile). Moreover, since the fuse accommodation box has a plurality of cavity chambers partitioned by a partition wall, high-density mounting can be achieved in combination with miniaturization of the fuse while preventing a short circuit of the fuse.

1 is a perspective view of a fuse according to a first embodiment of the present invention. 1A is a front view of a fuse element, FIG. 1B is a plan view of the fuse element, and FIG. 1C is a right side view of the fuse element. It is a disassembled perspective view which shows 1st Embodiment of this invention and shows the process of mounting | wearing with a fuse storage box. 1 is a perspective view of a fuse housing box in which a fuse is housed according to a first embodiment of the present invention. FIG. FIG. 5 shows the first embodiment of the present invention and is a cross-sectional view taken along line AA of FIG. 4. FIG. 5 shows the first embodiment of the present invention and is a cross-sectional view taken along line BB in FIG. 4. It is a front view of a fuse, showing a second embodiment of the present invention. FIG. 6 is a perspective view of a fuse, showing a third embodiment of the present invention. (A) is a perspective view of a conventional fuse, and (b) is an exploded perspective view of the conventional fuse. It is a perspective view of the vehicle-mounted junction box in which the fuse of a prior art example is mounted | worn.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1 shows a first embodiment of the present invention, FIG. 1 is a perspective view of a fuse 1A, FIG. 2 (a) is a front view of a fuse element 2, FIG. 2 (b) is a plan view of the fuse element 2, and FIG. (C) is a right side view of the fuse element 2, FIG. 3 is an exploded perspective view showing a process of mounting the fuse 1A in the fuse housing box 10, and FIG. 4 is a perspective view of the fuse housing box 10 in which the fuse 1A is housed. 5 is a cross-sectional view taken along line AA in FIG. 4, and FIG. 6 is a cross-sectional view taken along line BB in FIG.

  As shown in FIG. 1, the fuse 1 </ b> A includes a fuse element 2 formed of a conductive and highly rigid wire, and a synthetic resin form holding member 3 fixed to the fuse element 2. ing.

  As shown in detail in FIGS. 2A to 2C, the fuse element 2 is made of, for example, a zinc alloy, and is formed of a wire having a substantially cross-sectional shape. The fuse element 2 has a pair of connection terminal portions 2a formed by bending both ends of a wire cut to a predetermined dimension in parallel, and a cross-sectional area smaller than other portions between the pair of connection terminal portions 2a. The fusible part 2b is formed in a substantially U shape.

  The soluble part 2b is formed to have a smaller cross-sectional area than other parts by crushing. The cross-sectional area and length of the fusible portion 2b are appropriately adjusted based on the allowable current value. A press-fit locking portion 2c in which a minute protrusion protrudes from the surface is formed at an intermediate position of each connection terminal portion 2a. The distal end portion of each connection terminal portion 2a is formed into a tapered portion 2d that becomes narrower toward the distal end by being crushed.

  As shown in FIG. 1, the shape holding member 3 has an elongated rectangular block portion 3a having a size slightly larger than the width of the fuse element 2, and outward from both ends of the bottom surface of the block portion 3a. The latching | locking part 3b is each protrudingly provided. The pair of locking portions 3b are elastically deformed by an external force from below so as to be within the width dimension of the block portion 3a.

  The shape holding member 3 is fixed by press-fitting the pair of connection terminal portions 2a of the fuse element 2 to the block portion 3a up to the position of the press-fitting locking portion 2c. The form-holding member 3 that has been press-fitted and fixed does not easily fall off due to the strong locking force of the press-fitting locking portion 2c. The form holding member 3 holds the form of the fuse element 2. As a result, the fuse element 2 is held in a form so as not to be deformed such that the space between the pair of connection terminal portions 2a expands or narrows.

  Next, the fuse accommodation box 10 in which a large number of fuses 1A configured as described above are accommodated will be described.

  As shown in FIGS. 3 and 4, the fuse housing box 10 is disposed on the base plate 12 with a space between the square frame 11, the base plate 12 disposed on the bottom surface of the frame 11, and the base plate 12. A plurality of partition walls 13 are provided. The frame body 11, the base plate 12, and the partition walls 13 are all formed of an insulating resin material.

  In the fuse housing box 10, a plurality of (10 chambers in this embodiment) cavity chambers 14 partitioned by a partition wall 13 are formed in a horizontal row. The width dimension W2 of each cavity chamber 14 is set slightly larger than the width W1 of the fuse 1A. However, since the fuse 1A itself is narrow, it is set to be narrower than the conventional cavity chamber.

  Terminal insertion holes 12 a (shown in FIGS. 5 and 6) are formed at positions corresponding to the respective cavity chambers 14 of the base plate 12. The width dimension of the terminal insertion hole 12a is set to a width dimension through which the pair of connection terminal portions 2a of the fuse 1A pass but the block portion 3a does not pass.

  When the fuse 1A is inserted into the cavity chamber 14, the pair of connection terminal portions 2a enter the terminal insertion holes 12a, and then the locking portions 3b of the shape holding member 3 abut against the peripheral ends of the terminal insertion holes 12a. When the fuse 1A is further inserted from this position, the pair of locking portions 3b are elastically deformed to allow insertion into the terminal insertion hole 12a. At the same time as the pair of locking portions 3b pass through the terminal insertion hole 12a, the block portion 3a of the shape maintaining member 3 abuts against the base plate 12, and the pair of locking portions 3b are elastically deformed to be opposite to the terminal insertion hole 12a It is locked to the peripheral edge on the side. Thereby, as shown in FIG. 4, the fuse 1 </ b> A is mounted in the cavity chamber 14 of the fuse accommodating box 10.

  The fuse storage box 10 to which the fuse 1A is attached is attached to, for example, a fuse attachment structure of a power supply holder of an in-vehicle junction box.

  As described above, the fuse 1A has a cross-sectional area between the pair of connection terminal portions 2a and the pair of connection terminal portions 2a formed by bending both ends of the conductive wire so as to be parallel to each other. A conductive fuse element 2 having a fusible portion 2 b formed in a small size and an insulating form holding member 3 that is fixed to the fuse element 2 and holds the form of the fuse element 2 are provided. Therefore, since the fuse element 2 can be produced by cutting a conductive wire into a predetermined length and bending or crushing the cut wire, the conductive wire can be produced with almost no material loss. In particular, cutting, crushing, and bending of conductive wires can be performed with a single facility and can be manufactured at a very low cost.

  In addition, since the fuse element 2 is a wire rod, the width of each connection terminal portion 2a itself is narrow, and the shape holding member 3 for holding the shape of the fuse element 2 may be narrow and simple, so that it can be compared with the conventional example. The fuse 1A can have a narrow width W1. That is, the fuse 1A can be downsized.

  The shape holding member 3 is fixed to the fuse element 2 by press-fitting the fuse element 2. Therefore, since it is only necessary to press-fit the fuse element 2 into the configuration holding member 3, the fuse 1A can be easily manufactured.

  The shape holding member 3 has a locking portion 3b that is locked by elastic deformation. Since the fuse 1A is mounted in the fuse housing box 10 using the locking portion 3b, the fuse 1A is simply inserted. The fuse housing box 10 can be securely mounted so as not to fall off.

  The fuse 1 </ b> A is accommodated in a fuse accommodation box 10 having a plurality of cavity chambers 14 partitioned by a partition wall 13. Since each fuse 1A is small as described above, and it is only necessary to form the cavity chamber 14 to be small accordingly, the fuse housing box 10 can be miniaturized (low profile). Further, since the fuse housing box 10 has a plurality of cavity chambers 14 partitioned by the partition wall 13, it can be mounted at high density in combination with the miniaturization of the fuse 1A while preventing a short circuit between the fuses 1A. Since the fuse housing box 10 can be reduced in size (reduced in height) as described above, the thickness of the power supply holder can be reduced, and the resin material for the on-vehicle junction block can be reduced.

  Further, since the fuse 1A can change the width of the fuse element 2 by changing the bending position of the wire rod, the thickness of the power supply holder can be reduced by this, and the resin material of the in-vehicle junction block can be reduced. it can.

(Second Embodiment)
FIG. 8 is a front view of a fuse 1B according to the second embodiment of the present invention.

  As shown in FIG. 8, the fuse 1B of the second embodiment is formed in a shape in which the fusible portion 2b of the fuse element 2 is bent into a wave shape. The curved shape of the soluble part 2b is produced by bending.

  The other configuration is the same as that of the first embodiment, and a duplicate description is omitted. In addition, the same code | symbol is attached | subjected to the same structure location of drawing, and it aims at clarification.

  Thus, since the fusible portion 2b of the fuse element 2 is bent, the fuse 1B having a low current value can be created, and the width dimension W1 of the fuse element 2 can be further narrowed.

(Third embodiment)
FIG. 9 is a front view of a fuse 1C according to the third embodiment of the present invention.

  As shown in FIG. 9, in the fuse 1C of the third embodiment, the fuse element 2 is formed of a plate-shaped wire.

  The other configuration is the same as that of the first embodiment, and a duplicate description is omitted. In addition, the same code | symbol is attached | subjected to the same structure location of drawing, and it aims at clarification.

  Thus, since the fuse element 2 is plate-shaped, the fuse 1C is strong in strength. The mating terminal can be a tuning fork-shaped terminal.

  In the present invention, the fuse element 2 only needs to be able to be bent or crushed, and the cross-sectional shape may be a wire other than a square or plate.

DESCRIPTION OF SYMBOLS 1A, 1B, 1C Fuse 2 Fuse element 2a Connection terminal part 2b Soluble part 3 Form holding member 3b Locking part 10 Fuse storage box 13 Partition wall 14 Cavity chamber

Claims (4)

Conductive wire having a pair of connecting terminal portions formed by bending both ends of the conductive wire and a soluble portion formed between the pair of connecting terminal portions with a smaller cross-sectional area than other portions. A fuse element;
A fuse having an insulating form holding member fixed to the fuse element and holding the form of the fuse element. The fuse according to claim 1,
The fusible portion of the fuse element has a bent shape. A fuse according to claim 1 or claim 2, wherein
The shape holding member has a locking portion that is locked by elastic deformation, and can be mounted in a fuse housing box using the locking portion.   4. The fuse mounting structure according to claim 1, wherein the fuse according to any one of claims 1 to 3 is housed in a fuse housing box having a plurality of cavity chambers partitioned by a partition wall.

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