JP2011159423A - Fuse - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuse preventing melting of a housing resulting from heat generation of a fuse body as much as possible while preventing secondary short circuit. <P>SOLUTION: The fuse 1 includes a housing 10 with a pair of terminal parts 3, a fuse body 2 equipped with a coupling part 4 coupling between the pair of terminal parts 3 and having a fusible part 5 and a pair of lance parts 6, a housing chamber 11 housing the fuse body 2, a partitioning wall 12 partitioning between the pair of the terminals 3 housed in the housing chamber 11, and a pair of lance locking parts 13 engaged to either side of the partitioning wall 12 and with each lance part 6 locked. Between the fuse body 2 and an inner wall surface 14 of the housing chamber 11, a gap 15 which does not come in contact with the inner wall surface 14 is provided along a whole area of an outer surface of either side of the fuse body 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fuse that is detachable from a pair of mating terminals.

  As this type of fuse, there is one disclosed in Patent Document 1. As shown in FIG. 9A, the fuse 50 includes a fuse body 51, a housing 60 that houses the fuse body 51, and a lid body 70 that closes an opening 60 a of the housing 60. The fuse body 51 includes a pair of terminal portions 52, a connecting portion 53 that connects them and has a fusible portion 54, and a pair of lance portions 55 that protrude from each terminal portion 52 toward the inner surface side. Has been. The pair of terminal portions 52, the connecting portion 53, and the pair of lance portions 55 are formed by press-molding a metal plate. Each terminal portion 52 is a female terminal.

  The housing 60 has a storage chamber 61 whose one end surface is opened by an opening 60a. The fuse body 51 is accommodated in the accommodation chamber 61. The accommodation chamber 61 is partly partitioned by a partition wall 62. A pair of terminal portions 52 are arranged in a region partitioned by the partition wall 62. The housing 60 has a terminal entrance 60 b that opens to the pair of terminal portions 52. A pair of mating terminals 71 enter from the pair of terminal entrances 60b.

  A pair of lance locking portions 63 are provided on both sides of the partition wall 62. The lance portions 55 are locked to the pair of lance locking portions 63. When each lance portion 55 is locked, the fuse body 51 is prevented from being displaced from a predetermined position in the accommodation chamber 61 by an insertion force from the mating terminal 71 or the like.

  Protruding walls 64 are provided on the inner wall surfaces on both sides of the housing chamber 61 of the housing 60 and near each terminal entrance 60b. The outer surfaces of the terminal portions 52 are in contact with the pair of protruding walls 64.

  In the above configuration, when an overcurrent is passed through the fuse 50 attached to the pair of mating terminals 71, the fusible portion 54 is blown. When the fusible portion 54 is melted, the fuse body 51 is divided into two. In the pair of segment pieces 51A and 51B (shown in FIG. 9B), the outer surface side of each terminal portion 52 abuts against the projecting wall 64, and due to the action of the elastic restoring force of each lance portion 55, FIG. As shown in b), the pair of fractional pieces 51A and 51B shift in the outward opening direction and are separated from each other. Thereby, a secondary short circuit can be prevented.

JP-A-9-171766

  However, in the conventional fuse 50, since the pair of terminal portions 52 of the fuse body 51 are in contact with the projecting walls 64 of the housing 60, the contact area between the fuse body 51 and the housing 60 increases, and the housing 60 The fuse body 51 is easily affected by heat generation. Therefore, there is a high possibility that the housing 60 is melted by heat generated by the fuse body 51.

  Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fuse capable of preventing melting of the housing due to heat generation of the fuse body as much as possible while preventing a secondary short circuit. .

  According to a first aspect of the present invention, there is provided a fuse body having a pair of terminal portions arranged at intervals, a pair of terminal portions connected to each other, a connecting portion having a fusible portion, and a pair of lance portions. A housing chamber in which the fuse body is housed, a partition wall for partitioning the pair of terminal portions housed in the housing chamber, and provided on both sides of the partition wall. A fuse having a housing having a pair of lance locking portions, the inner wall surface extending over the entire outer surface of the fuse body between the fuse body and the inner wall surface of the receiving chamber. A gap that does not come into contact with is provided.

  A second aspect of the invention is the fuse according to the first aspect, wherein the pair of lance locking portions are provided at positions that do not overlap each other in the width direction of the partition wall.

  According to the invention of claim 1, since the contact area between the fuse body and the housing is reduced by the gap, the housing is hardly affected by the heat generated by the fuse body, and the housing is prevented from being melted due to the heat generated by the fuse body as much as possible. it can. Then, when the fusible part melts and the fuse body is divided into two parts, the movement to the partition wall side is regulated by each lance part, and there is a gap on the opposite side. Shifts away from the piece. As described above, it is possible to prevent melting of the housing due to heat generation of the fuse body as much as possible while preventing secondary short circuit.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the distance between the pair of terminals is the same, and the pair of partition walls on which the lance locking portions are formed are made thin without reducing the thickness. Since the lance locking portion can be provided, the strength of the partition wall can be prevented from being lowered without increasing the distance between the pair of terminals.

1 is a perspective view of a fuse, showing an embodiment of the present invention. 1A is a plan view of a fuse, FIG. 1B is a front view of the fuse, and FIG. 3C is a bottom view of the fuse. FIG. 3A is a cross-sectional view taken along line AA of FIG. 2A, and FIG. 4B is a cross-sectional view of the fuse when the fuse body is blown. FIG. 3 is a cross-sectional view taken along the line BB in FIG. 1 is a perspective view of a fuse body according to an embodiment of the present invention. 1 is an exploded perspective view of a fuse body according to an embodiment of the present invention. FIG. 4 is a perspective view showing the embodiment of the present invention before the bus bar is bent. FIG. 3 is a perspective view of the spring-shaped member before bending, showing an embodiment of the present invention. A conventional example is shown, (a) is a sectional view of a fuse, (b) is a sectional view of a fuse when a fuse body is blown.

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

  1 to 8 show an embodiment of the present invention, FIG. 1 is a perspective view of the fuse 1, FIG. 2 (a) is a plan view of the fuse 1, FIG. 2 (b) is a front view of the fuse 1, and FIG. (C) is a bottom view of the fuse 1, FIG. 3 (a) is a cross-sectional view taken along line AA of FIG. 2 (a), FIG. 3 (b) is a cross-sectional view of the fuse 1 when the fuse body 2 is blown, 4 is a cross-sectional view taken along line BB in FIG. 2B, FIG. 5 is a perspective view of the fuse body 2, FIG. 6 is an exploded perspective view of the fuse body 2, and FIG. 7 is a perspective view before the bus bar A is bent. FIG. 8 is a perspective view of the spring-shaped member B before bending.

  As shown in FIGS. 1 to 4, the fuse 1 includes a fuse body 2, a housing 10 in which the fuse body 2 is accommodated, and a lid 20 attached to the housing 10.

  As shown in detail in FIGS. 5 and 6, the fuse body 2 includes a pair of terminal portions 3, a connection portion 4 that connects the pair of terminal portions 3, and has a fusible portion 5, and each terminal portion. 3 and a pair of lances 6 projecting inward from each other. Each terminal portion 3 is a female terminal.

  The fuse body 2 is configured by assembling three members, a bus bar A and two spring-shaped members B. The bus bar A is formed by press-molding the metal plate of FIG. The bus bar A forms a fixed terminal plate portion 3 a of the connecting portion 4 and the pair of terminal portions 3. The connecting portion 4 is provided with a caulking portion 5a. The fusible portion 5 is configured by caulking and fixing the low melting point metal 5b to the caulking portion 5a. Each spring-shaped member B is formed by press-molding the metal plate of FIG. 8 while being engaged with each fixed terminal plate portion 3a of the bus bar A. Each spring-shaped member B forms a frame body 3 b, an elastic terminal portion 3 c, and a lance portion 6 of each terminal portion 3. That is, each terminal portion 3 is formed by the bus bar A and the spring-shaped member B. The pair of lances 6 are arranged at positions shifted so as not to overlap each other, that is, at alternate positions.

  The housing 10 has a storage chamber 11. One end surface side of the storage chamber 11 is opened by an opening 10 a of the housing 10. The fuse body 2 is accommodated in the accommodation chamber 11 using the opening 10a. Part of the storage chamber 11 is partitioned by a partition wall 12. A pair of terminal portions 3 are respectively arranged in regions partitioned by the partition wall 12. In the housing 10, terminal entrances 10 b that open to the pair of terminal portions 3 are formed. A pair of mating terminals 21 enter from the pair of terminal entrances 10b. Each counterpart terminal 21 is a male terminal.

  A pair of lance locking portions 13 is provided on both sides of the partition wall 12. The pair of lance locking portions 13 are provided at positions that do not overlap each other in the width direction of the partition wall 12 (see FIGS. 2C and 4). Each lance portion 6 is locked to the pair of lance locking portions 13. Each lance portion 6 is locked so that the fuse body 2 is not displaced from a predetermined position of the storage chamber 11 by an insertion force from the mating terminal 21 or the like.

  Between the fuse body 2 and the inner wall surfaces 14 on both sides of the housing chamber 11 of the housing 10, a gap 15 that does not contact the inner wall surface 14 is provided over the entire outer surface on both sides of the fuse body 2.

  The lid 20 closes the opening 10 a of the housing 10.

  In the above configuration, when the fuse 1 is attached to the pair of mating terminals 21 and an overcurrent is passed through the fuse 1, the fusible portion 5 is blown. When the fusible portion 5 is blown, the fuse body 2 is divided into two. The pair of partial pieces 2A and 2B of the fuse body 2 is restricted from moving toward the partition wall 12 by the lances 6 and there is a gap 15 on the opposite side, so that it is shown in FIG. As shown in FIG. In particular, when the elastic restoring force of each lance portion 6 acts on each of the partial pieces 2A and 2B, the piece is surely shifted in the outward opening direction. Thereby, a secondary short circuit can be prevented.

  Between the fuse body 2 and the inner wall surface 14 of the housing chamber 11, a gap 15 that does not contact the inner wall surface 14 is provided over the entire outer surface on both sides of the fuse body 2. Since the contact area between 10 is less than the conventional example due to the gap 15, the housing 10 is less susceptible to the heat generated by the fuse body 2, and the housing 10 is prevented from being melted due to the heat generated by the fuse body 2 as much as possible. As described above, it is possible to prevent melting of the housing 10 due to heat generation of the fuse body 2 as much as possible while preventing secondary short circuit.

  The pair of lance locking portions 13 are provided at positions that do not overlap each other in the width direction of the partition wall 12. Therefore, the distance between the pair of terminals is the same, and the pair of lance locking portions 13 can be provided without reducing the thickness of the partition wall 12 where the lance locking portion 13 is formed. It is possible to prevent the strength of the partition wall 12 from being reduced without increasing the distance between the pair of terminals. In other words, when a pair of lance locking portions 13 are provided at the same position in the width direction of the partition wall 12, in order to ensure a predetermined thickness of the partition wall 12 where the lance locking portions 13 are formed. In this case, it is necessary to increase the thickness of the partition wall 12, and in this way, the distance between the pair of terminals is increased. On the other hand, if it is going to set the distance between a pair of terminals to be the same, the thickness of the partition wall 12 must be reduced, and in this way, the strength of the partition wall 12 is weakened. Such a problem is solved by providing a pair of lance locking portions 13 at positions where the partition walls 12 do not overlap each other in the width direction.

  The fuse body 2 is configured by assembling three members, that is, a bus bar A and a pair of spring-shaped members B, and each spring-shaped member B is provided with a lance portion 6. Therefore, since it is not necessary to provide the lance part 6 in the bus bar A, the bus bar capacity at the time of energization can be increased as compared with the conventional example.

DESCRIPTION OF SYMBOLS 1 Fuse 2 Fuse main body 3 Terminal part 4 Connection part 5 Soluble part 6 Lance part 10 Housing 11 Storage chamber 12 Partition wall 13 Latch latching part 14 Inner wall surface 15 Crevice

Claims (2)

A fuse body having a pair of terminal portions arranged at intervals, a pair of the terminal portions, a connecting portion having a fusible portion, and a pair of lance portions;
A housing chamber in which the fuse body is housed, a partition wall that partitions the pair of terminal portions housed in the housing chamber, and provided on both sides of the partition wall, and the lance portions are respectively locked. A fuse having a housing having a pair of lance locking portions,
A fuse is provided between the fuse main body and the inner wall surface of the housing chamber so as not to contact the inner wall surface over the entire outer surface of the fuse main body. The fuse of claim 1,
A pair of the lance locking portions are provided at positions that do not overlap with each other in the width direction of the partition wall.

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