JP7364366B2 - Current interrupting structure - Google Patents

Description

The present invention relates to a current interrupting structure that interrupts a circuit when an overcurrent flows.

A first conventional example is shown in FIGS. 7 and 8 (see Patent Document 1). The current interrupting structure of this first conventional example has a cartridge fuse (not shown) with a small melting current value and a blade fuse 60 with a large melting current value, and uses the blade fuse 60 to connect the cartridge fuse (not shown) This enables the replacement of

That is, in the first conventional example, a cartridge fuse accommodating portion 51 provided in a junction box main body 50 of an electrical junction box, a housing 52 having the same shape as a cartridge fuse (not shown), and a cartridge fuse accommodated in the housing 52. and a blade fuse 60 connected to the pair of relay terminals 53.

The pair of relay terminals 53 includes a press-contact blade terminal portion 53a that connects the two blade fuses 60 in parallel, and a female terminal portion 53b that connects to the pair of input/output terminals 61. By connecting two blade fuses 60 in parallel, the total melting current value can be changed. Two blade fuses 60 are used to replace a cartridge fuse (not shown) by having a modified fusing current value equal to or near the fusing current value of the cartridge fuse (not shown). be able to. In other words, the melting current value of the current interrupting structure can be changed.

A second conventional example is shown in FIG. 9 (see Patent Document 2). The current interrupting structure of this second conventional example includes three tab terminals 70, 71, 72, two fuses 73 connected to the tab terminals 70, 71, 72, and a joint terminal connecting between the two fuses 73. 75. Each fuse 73 has a bus bar 74 having two terminal portions 74a and a fusing portion 74b connecting the two terminal portions 74a. By connecting the two fuses 73 in parallel through the joint terminal 75, the melting current value of the current interrupting structure is changed.

Japanese Patent Application Publication No. 2010-108787 Japanese Patent Application Publication No. 2002-190246

However, in the first conventional example, since the housing 52 and the relay terminal 53 are required, the number of parts increases and the configuration becomes complicated. Furthermore, since the housing 52 that houses the blade fuse 60 is used, the electrical connection box becomes larger.

In the second conventional example, a joint terminal 75 is separately required as a component. Further, when changing the melting current value, the work of assembling the joint terminal 75 increases.

Therefore, the present invention has been made to solve the above-mentioned problems, and provides a current interrupting structure that allows capacity changes without increasing the number of parts, complicating the configuration, and increasing the work required to assemble parts. The purpose is to provide.

The present invention provides an element mounting member having a cutoff element that cuts off current when an overcurrent is applied, a cutoff element accommodating portion capable of accommodating a plurality of the cutoff elements, and the cutoff element accommodated in the cutoff element accommodation portion. The present invention is a current interrupting structure characterized by comprising a pair of terminals connected to an element and connected in parallel when there are a plurality of interrupting elements.

According to the present invention, the capacity of the current interrupting structure can be changed without increasing the number of parts, complicating the structure, or increasing the work required to assemble parts.

FIG. 1 is an exploded perspective view of a current interrupting structure, showing one embodiment of the present invention. One embodiment of the present invention is shown, in which (a) is a perspective view of a blocking element, and (b) is a front view of a bus bar within the blocking element. One embodiment of the present invention is shown, in which (a) is a sectional view taken along the line AA in FIG. 1, and (b) is a sectional view taken along the line BB in FIG. 1 shows an embodiment of the present invention, in which (a) is a sectional view showing a state in which one blocking element is accommodated in a blocking element accommodating portion, and (b) is an equivalent circuit diagram thereof. An embodiment of the present invention is shown, in which (a) is a cross-sectional view showing a state in which two blocking elements are accommodated in a blocking element accommodating portion, and (b) is an equivalent circuit diagram thereof. An embodiment of the present invention is shown, in which (a) is a sectional view showing a state in which three blocking elements are accommodated in a blocking element accommodating portion, and (b) is an equivalent circuit diagram thereof. FIG. 2 is an exploded perspective view of a current interrupting structure, showing a first conventional example. FIG. 2 is a perspective view showing a first conventional example in which two blade fuses are housed in a housing. FIG. 7 is a perspective view of a current interrupting structure, showing a second conventional example.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 to 6 show one embodiment of the present invention. As shown in FIG. 1, the first embodiment is applied to a current interrupting structure A of an electrical junction box mounted on a vehicle. The current interrupting structure A is connected to the interrupting element 1, the interrupting element accommodating part 11 which can accommodate three interrupting elements 1, and the interrupting element 1 accommodated in the interrupting element accommodating part 11, and the interrupting element 1 is connected to the interrupting element 1 accommodated in the interrupting element accommodating part 11. In some cases, a pair of terminals 20 are provided which are connected in parallel.

The blocking element 1 is a fusible link, as shown in FIGS. 1 and 2. The blocking element 1 includes a bus bar 2 and an insulating resin portion 5 covering most of the bus bar 2. The bus bar 2 has two pressure contact blade terminal parts (terminal parts) 3 and a fusing part 4 that connects them. The insulating resin portion 5 is a rectangular parallelepiped, but has slits 5a formed at two locations. Parts of the two pressure contact blade terminal portions 3 are exposed through these two slits 5a. In the cutoff element 1, when an overcurrent exceeding a specified value is applied, the fusing portion 4 blows out and cuts off the current supply.

As shown in FIGS. 1 and 3, the blocking element accommodating portion 11 is provided in the junction box body 10, which is an element mounting member. The blocking element accommodating portion 11 is provided with two partition ribs 12 extending in the vertical direction on opposing sides. The blocking element accommodating portion 11 is partitioned into three sections by a pair of partitioning ribs 12 at two locations, and is formed to be able to accommodate three blocking elements 1 in a parallel state. The pair of partition ribs 12 serve as an insertion guide when the blocking element 1 is accommodated in the blocking element accommodating portion 11, and also position the accommodated blocking element 1.

The entire top surface of the blocking element accommodating portion 11 is open to the outside, and the bottom surface is covered with a bottom wall 13. The blocking element 1 is inserted into the blocking element accommodating portion 11 from the top opening. Terminal slits 14 are formed in two locations on the bottom wall 13. Each terminal slit 14 is formed across three sections of the interrupting element accommodating portion 11 .

The pair of terminals 20 are an input side terminal and an output side terminal of the current interrupting structure A, as shown in FIGS. 1 and 4 to 6. Each terminal 20 has an electric wire connection part 21 that connects the electric wire W by crimping, and an element contact part 22 that connects to the interrupting element 1. The element contact portion 22 has a flat plate shape. The element contact portion 22 is inserted into the interrupting element accommodating portion 11 through the terminal slit 14 . The element contact portion 22 is formed to have a width dimension D1 to be connected to the press-contact blade terminal portions 3 of all the cut-off elements 1 accommodated in the cut-off element accommodating portion 11 . In the case of a plurality of blocking elements 1, the plurality of blocking elements 1 are connected in parallel.

In the current interrupting structure A having the above configuration, the number of interrupting elements 1 accommodated in the interrupting element accommodating portion 11 can be selected from one to three. Specifically, it is possible to select between accommodating one blocking element 1 (the state shown in FIG. 4), accommodating two blocking elements 1 (the state shown in FIG. 5), and accommodating three blocking elements 1 (as shown in FIG. 6). . Therefore, when the entire melting current value of the current interrupting structure A is the same as the melting current value of a single interrupting element 1, one interrupting element 1 is accommodated in the interrupting element accommodating portion 11 (state in FIG. 4). . Moreover, when the melting current value is changed, two or three interrupting elements 1 are accommodated in the interrupting element accommodating portion 11. Thereby, it is possible to respond to design changes in the overall melting current value of the current interrupting structure A. For example, in a current interrupting structure A equipped with interrupting elements 1 that are being mass-produced, it is possible to respond to changes in the design of the melting current value of the current interrupting structure A without changing the design of the interrupting elements 1 that are being mass-produced.

As explained above, the current interrupting structure A includes the interrupting element 1 , the junction box body 10 having the interrupting element accommodating part 11 that can accommodate a plurality of interrupting elements 1 , and the interrupting element accommodated in the interrupting element accommodating part 11 . 1, and a pair of terminals 20 that are connected in parallel when there are a plurality of interrupting elements 1. Therefore, the capacity can be changed by providing the blocking element accommodating part 11 in the junction box body 10 and changing the number of blocking elements 1 accommodated in the blocking element accommodating part 11. Therefore, since the casing and relay terminals as in the first conventional example are not required, the number of parts does not increase, the configuration does not become complicated, and the work for assembling parts does not increase. Furthermore, there is no need for a joint terminal as in the second conventional example. As described above, the capacity of the current interrupting structure A can be changed without increasing the number of parts, complicating the configuration, or increasing the work required to assemble parts.

The blocking element accommodating portion 11 is formed so that three blocking elements 1 are arranged in parallel. Therefore, the structure of the pair of terminals 20 is simple because the element contact portion 22 may be formed into a flat plate shape. Further, when the number of the blocking elements 1 to be accommodated is changed, the design can be easily changed by simply changing the width dimension D1 of the element contact portions 22 of the pair of terminals 20.

In the embodiment described above, the blocking element accommodating portion 11 is formed to accommodate three blocking elements 1, but may accommodate two blocking elements 1, four or more blocking elements 1, etc. It may be something that you do.

In the embodiment described above, the width dimension D2 of the three blocking elements 1 is all the same, but the blocking elements 1 may have different width dimensions. In that case, the configuration of the blocking element accommodating portion 11 is changed depending on the width dimension and number of blocking elements 1 to be accommodated. Furthermore, the partition rib 12 may be omitted.

In the embodiment described above, the cutoff element 1 is a fusible link that blocks energization by blowing out the fusing part 4, but any element may be used as long as it prevents the energization of an overcurrent exceeding a specified value.

In the above embodiment, the present invention is applied to the current interrupting structure A of an electrical junction box, but it can be applied to a current interrupting structure A other than an electrical junction box.

A Current interrupting structure 1 Interrupting element 10 Connection box body (element mounting member)
11 Breaking element accommodating part 20 Terminal

Claims (2)

a cutoff element that cuts off current when an overcurrent is applied;
an element mounting member having a blocking element accommodating portion capable of accommodating a plurality of the blocking elements;
a pair of terminals connected to the blocking element accommodated in the blocking element housing section and connected in parallel when there are a plurality of blocking elements;
The entire upper surface of the blocking element housing part is open to the outside,
The blocking element is inserted through the upper opening of the blocking element accommodating part and housed in the blocking element accommodating part ,
The blocking element accommodating portion is provided with partition ribs extending in the vertical direction on mutually opposing sides,
Terminal slits are formed at two locations on the bottom wall that covers the bottom of the blocking element accommodating portion,
The current interrupting structure is characterized in that the pair of terminals are inserted into the interrupting element accommodating portion through the terminal slit and connected to the interrupting element . The current interrupting structure according to claim 1,
The current interrupting structure is characterized in that the interrupting element accommodating portion is formed such that a plurality of the interrupting elements are arranged in parallel.

Images