Fuse Unit

Abstract

To provide a fuse unit having an excellent extendability while suppressing increase in a size.SOLUTION: There is provided a fuse unit 100 comprising: a bus bar 10 that has a plurality of terminal connection parts; and a housing 30 that accommodates the bus bar 10. The bus bar 10 has: a main body part 11; first terminal connection parts 12 formed at one side part of the main body part 11 in parallel; a second terminal connection part 14 formed at the other side part of the main body part 11; and fusible parts 13 respectively provided between the plurality of first terminal connection parts 12 and the main body part 11, connecting between the main body part 11 and the first terminal connection parts 12. At the other side part of the main body part 11, a fuse terminal part 66 with which a fuse 63 can be connected is provided. A translucent cover 50 covering the fusible parts 13 is fitted to the housing 30.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a fuse unit. [Background technology]

[0002] Patent Document 1 discloses a multiple fuse that includes a bus bar and a housing that covers the bus bar, with a fuse connection terminal and a terminal provided via a melting portion formed on one side of the bus bar. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-10768 A Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, in a multiple fuse in which a bus bar having various terminals formed on only one side is covered with a housing, it is difficult to increase the number of terminals to expand the fuse function. Therefore, when expanding the fuse function, the fuse function must be supplemented with another power supply block, etc., which leads to an increase in the size of the power supply block.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a fuse unit that is excellent in expandability while preventing an increase in size. [Means for solving the problem]

[0006] In order to achieve the above object, the fuse unit according to the present invention comprises the following features (1) to ( 3 ) is its feature. (1) A fuse unit including a bus bar having a plurality of terminal connection portions and a housing that accommodates the bus bar, The bus bar includes: A main body portion, a first terminal connection portion formed in parallel on one side of the main body portion; a second terminal connection portion formed on the other side of the main body portion; a fusible portion provided between at least one of the plurality of first terminal connection portions and the main body portion to connect the main body portion and the first terminal connection portion; having a fuse terminal portion to which a fuse can be connected is provided on the other side of the main body portion; A light-transmitting cover that covers the fusible portion is fitted into the housing. R, the fuse terminal portion is integrally formed on the other side portion of the body portion of the bus bar, The housing includes a first housing and a second housing that sandwich and accommodate the bus bar, The first housing and the second housing are each provided with a cover portion corresponding to a position of the fuse terminal portion, When the first housing and the second housing are combined, a fuse cavity in which the fuse terminal portion is accommodated is formed by the cover portions of the first housing and the second housing. Fuse unit.

[0007] According to the fuse unit having the above configuration (1), a fuse terminal is provided on the other side of the body of the bus bar. Therefore, a fuse function can be easily added by connecting a fuse to this fuse terminal. This makes it possible to omit a fuse circuit of a power block separate from the fuse unit and reduce the size. In addition, the fuse terminal can be provided on one side of the main body where the multiple first terminal connection parts are provided, and the fuse terminal can be provided on the other side opposite to the one side of the main body, thereby limiting the increase in size due to the addition of fuses, and easily expanding the functionality while achieving overall miniaturization. Furthermore, by integrally forming the fuse terminal portion on the other side of the bus bar, it is possible to improve expandability while suppressing an increase in costs due to an increase in the number of parts.

[0008] (2) A fuse unit comprising: a bus bar having a plurality of terminal connection portions; and a housing that accommodates the bus bar, The bus bar includes: A main body portion, a first terminal connection portion formed in parallel on one side of the main body portion; a second terminal connection portion formed on the other side of the main body portion; a fusible portion provided between at least one of the plurality of first terminal connection portions and the main body portion to connect the main body portion and the first terminal connection portion; having a fuse terminal portion to which a fuse can be connected is provided on the other side of the main body portion; A light-transmitting cover that covers the fusible portion is fitted into the housing, The fuse terminal portion is formed on a separate extension bus bar, the extension bus bar has a joint portion that sandwiches and connects the other side portion of the main body portion of the bus bar, Fuse Unit .

[0009] According to the fuse unit having the configuration (2) above, a separate extension bus bar selected according to the required number and type of fuses can be connected to the main body of the bus bar, thereby making it possible to standardize the extension bus bar and reduce costs.

[0010] (3) A plurality of the extension bus bars are connectable to the other side of the main body of the bus bar. The fuse unit according to (2) above.

[0011] According to the fuse unit having the above configuration (3), the number of extension bus bars to be connected to the main body of the bus bar can be appropriately adjusted depending on the required number and type of fuses. In other words, the number of common extension bus bars can be increased or decreased without preparing multiple types of extension bus bars, thereby reducing the manufacturing cost of the extension bus bars. Effect of the Invention

[0014] According to the present invention, it is possible to provide a fuse unit that is excellent in expandability while preventing an increase in size.

[0015] The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading the following description of the preferred embodiment of the present invention (hereinafter, referred to as "embodiment") with reference to the accompanying drawings. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a fuse unit according to a first embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the fuse unit according to the first embodiment. [Diagram 3] FIG. 3 is a perspective view of the fuse unit according to the first embodiment, which is provided with another fuse block. [Figure 4] FIG. 4 is an exploded perspective view of the fuse unit according to the first embodiment, which is provided with another fuse block. [Diagram 5] FIG. 5 is a perspective view of a fuse unit according to a reference example. [Figure 6] FIG. 6 is an exploded perspective view of a fuse unit according to a reference example. [Figure 7] FIG. 7 is a perspective view of the fuse unit according to the second embodiment. [Figure 8] FIG. 8 is an exploded perspective view of the fuse unit according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0018] (First embodiment) First, the first embodiment will be described. Fig. 1 is a perspective view of the fuse unit according to the first embodiment. Fig. 2 is an exploded perspective view of the fuse unit according to the first embodiment.

[0019] 1 and 2, a fuse unit 100 according to the first embodiment includes a bus bar 10 and a housing 30, and a light-transmitting cover 50 is attached to the housing 30. The fuse unit 100 is mounted on a vehicle such as an automobile and electrically connects a battery and an external load. The fuse unit 100 has a cutoff function that cuts off the electrical connection when a current exceeding a rated current flows between the battery and the external load.

[0020] The bus bar 10 is formed from a metal plate having electrical conductivity, such as copper or a copper alloy. The bus bar 10 is formed by pressing the metal plate. The housing 30 and the light-transmitting cover 50 are molded from an insulating synthetic resin, and the light-transmitting cover 50 is transparent or translucent. The fuse unit 100 is provided with a fuse block 60 on its upper portion, and the fuse block 60 is removable.

[0021] The bus bar 10 has a main body portion 11, a first terminal connection portion 12, a fusible portion 13, a second terminal connection portion 14, and a coupling portion 15.

[0022] The first terminal connection portions 12 are formed in parallel on one side of the body portion 11. In this example, the busbar 10 has six first terminal connection portions 12, and three of the first terminal connection portions 12 have fastening holes 12a.

[0023] A fusible portion 13 is provided between each of the first terminal connection portions 12 and the main body portion 11. These fusible portions 13 melt when a current exceeding the rated current flows, and cut off the electrical connection between the main body portion 11 and the first terminal connection portion 12.

[0024] The second terminal connection portion 14 is formed on the other side of the body portion 11 opposite to the side on which the first terminal connection portion 12 is formed. This second terminal connection portion 14 is formed on one end side of the body portion 11. This second terminal connection portion 14 has a fastening hole 14a. And, the portion of the other side of the body portion 11 other than the portion where the second terminal connection portion 14 is formed is made into a coupling portion 15.

[0025] The housing 30 is composed of a first housing 31 and a second housing 32, and the bus bar 10 is accommodated so as to be sandwiched between the first housing 31 and the second housing 32.

[0026] The first housing 31 has a long and narrow rectangular window portion 33. A connection portion 35 is provided below the window portion 33 in the first housing 31. This connection portion 35 has a plurality of (six in this example) accommodation portions 37 partitioned by a plurality of (seven in this example) partition walls 36. The three accommodation portions 37 near one end of the first housing 31 are formed with accommodation slit portions 38, and nuts 39 for fastening and connecting a terminal of a power line or the like to the first terminal connection portion 12 are inserted into the accommodation slit portions 38 from below.

[0027] The second housing 32 has an elongated rectangular window 41. One end of the lower portion of the window 41 in the second housing 32 is cut away, and the other end forms a cover 43.

[0028] The first housing 31 and the second housing 32 are assembled to each other via the bus bar 10. As a result, the bus bar 10 is accommodated in the housing 30 consisting of the first housing 31 and the second housing 32.

[0029] In this accommodated state of the busbar 10, the first terminal connection portion 12 having the fastening hole 12a is disposed in a position facing the nut 39 inserted into the accommodation slit portion 38 of the connection portion 35 of the first housing 31. The first terminal connection portion 12 without the fastening hole 12a is accommodated in the accommodation portion 37 of the first housing 31 and covered by the cover portion 43 of the second housing 32. Furthermore, the second terminal connection portion 14 and the coupling portion 15 are in a state of protruding from the upper portion of the housing 30. The fusible portion 13 of the busbar 10 is disposed in the positions of the windows 33, 41 of the first housing 31 and the second housing 32, respectively.

[0030] The light-transmitting cover 50 has a pair of plate-like portions 51 formed in an elongated plate shape. One end of each of these plate-like portions 51 is connected by a connecting portion 53. As a result, the light-transmitting cover 50 is formed in a U-shape with the plate-like portions 51 extending in parallel with each other at a distance from each other.

[0031] This light-transmitting cover 50 is fitted and assembled from one side of the housing 30 accommodating the busbar 10 at the positions of the window portions 33, 41 of the first housing 31 and the second housing 32. As a result, in the housing 30, the window portions 33, 41 of the first housing 31 and the second housing 32, where the fusible portion 13 is exposed, are covered by the plate-shaped portion 51 of the light-transmitting cover 50. The fusible portion 13 of the busbar 10 accommodated in the housing 30 is visible through the light-transmitting cover 50 with the window portions 33, 41 covered by the plate-shaped portion 51 of the transparent or translucent light-transmitting cover 50.

[0032] The fuse block 60 attached to the connecting portion 15 of the bus bar 10 includes an extension bus bar 61 , a fuse housing 62 , and a fuse 63 .

[0033] The extension busbars 61 are made of a conductive metal material, and in this example, the fuse block 60 includes three extension busbars 61. The extension busbars 61 have a joint 65 and a plurality of fuse terminals 66 each consisting of a bifurcated tuning fork terminal. The joint 65 has a plurality of legs 65a, which are alternately arranged at positions offset in the thickness direction along the longitudinal direction. The coupling portion 15 of the busbar 10 can be inserted between the legs 65a.

[0034] The fuse housing 62 is molded from insulating synthetic resin and formed into a box shape. The fuse housing 62 accommodates a plurality of extension bus bars 61 inserted from the bottom. An insertion hole 67 is formed in the top of the fuse housing 62, and the fuse 63 is inserted into the insertion hole 67. The fuse 63 is connected to the bifurcated fuse terminal portion 66 of the extension bus bar 61 by being inserted into the insertion hole 67 of the fuse housing 62.

[0035] The fuse block 60 is attached to the coupling portion 15 of the bus bar 10 that protrudes from the upper portion of the housing 30 of the fuse unit 100. When the fuse block 60 is attached to the coupling portion 15, the coupling portion 15 is inserted into the leg portion 65a of the joint portion 65 formed on the extension bus bar 61 of the fuse block 60, thereby connecting the extension bus bar 61 to the coupling portion 15. Then, by attaching the fuse block 60 to the coupling portion 15, the separate extension bus bar 61 is coupled to the main body 11 of the bus bar 10, and the circuit is expanded.

[0036] In the fuse unit 100 having the above configuration, for example, a power line from a battery or an external load is connected to the first terminal connection portion 12, and the second terminal connection portion 14 is fastened to, for example, a bus bar such as a power block. Also, the fuse unit 100 is expandable by the fuse block 60 attached to the coupling portion 15 of the bus bar 10.

[0037] Fig. 3 is a perspective view of the fuse unit according to the first embodiment, which includes another fuse block. Fig. 4 is an exploded perspective view of the fuse unit according to the first embodiment, which includes another fuse block.

[0038] As shown in FIGS. 3 and 4, the fuse unit 100 can be fitted with another fuse block 60A of a different type.

[0039] The fuse block 60A includes a plurality of (two in this example) extension bus bars 61 each having two plate-shaped fuse terminal portions 66, and these extension bus bars 61 are housed in a fuse housing 62. In addition, in the fuse block 60A, a large fuse 63 is inserted into an insertion hole 67 in the upper part of the fuse housing 62 and connected to the plate-shaped fuse terminal portions 66 of the extension bus bars 61.

[0040] Here, a fuse unit according to a reference example will be described. Fig. 5 is a perspective view of a fuse unit according to a reference example, and Fig. 6 is an exploded perspective view of the fuse unit according to the reference example.

[0041] 5 and 6, the fuse unit 1 according to the reference example has a plate-shaped bus bar 2, and a plurality of first terminal connection portions 4 extend downward from a main body 3 of the bus bar 2. A second terminal connection portion 5 having a fastening hole 5a is provided on the bus bar 2 on the side of the main body 3 opposite to the first terminal connection portions 4. Resin housings 6, 7 are overlapped on both sides of the main body 3 of the bus bar 2, and a U-shaped light-transmitting cover 8 is inserted from one end. As a result, the bus bar 2 is covered by the housings 6, 7, and the fusible portions 9 formed on the bus bar 2 are covered and visible through the light-transmitting cover 8.

[0042] In the fuse unit 1 according to this reference example, the busbar 2 has a first terminal connection portion 4 on one side thereof, and a single second terminal connection portion 5 on the other side thereof. However, it is difficult to add a fuse function to the portion of the busbar 2 that is covered by the housings 6, 7 other than the portion on the other side where the second terminal connection portion 5 is provided. Therefore, in order to expand the fuse function, the added fuse function must be supplemented by another power supply block or the like, which leads to an increase in the size of the power supply block.

[0043] In contrast, according to the fuse unit 100 of this embodiment, a fuse terminal portion 66 is provided on the other side portion of the body portion 11 of the busbar 10. Therefore, a fuse function can be easily added by connecting a fuse 63 to this fuse terminal portion 66. This allows the fuse circuit of a power supply block separate from the fuse unit 100 to be omitted, making the unit more compact.

[0044] Furthermore, the fuse terminal portion 66 can be provided on the other side opposite to one side of the main body portion 11 on which the plurality of first terminal connection portions 12 are provided, and can be effectively utilized. Therefore, the increase in size due to the addition of the fuse 63 can be limited, and the function can be easily expanded while the overall size is reduced.

[0045] The fuse terminal portion 66 is formed on a separate extension bus bar 61, and the extension bus bar 61 has a joint portion 65 that clamps and connects to the other side portion of the body portion 11 of the bus bar 10. Therefore, the fuse block 60, 60A including the extension bus bar 61 selected according to the required number and type of fuses 63 can be attached to the body portion 11 of the bus bar 10 to connect the extension bus bar 61 to the bus bar 10. This allows the extension bus bar 61 to be standardized, reducing costs.

[0046] Furthermore, a plurality of extension bus bars 61 can be connected to the other side of the main body 11 of the bus bar 10. Therefore, the number of extension bus bars 61 connected to the main body 11 of the bus bar 10 can be appropriately adjusted according to the required number and types of fuses 63. In other words, since the number of shared extension bus bars 61 used can be increased or decreased, the manufacturing cost of the extension bus bars 61 can be reduced.

[0047] Second embodiment Next, a fuse unit according to a second embodiment will be described. The same structural parts as those in the first embodiment are given the same reference numerals and the description thereof will be omitted. Fig. 7 is a perspective view of the fuse unit according to the second embodiment, and Fig. 8 is an exploded perspective view of the fuse unit according to the second embodiment.

[0048] As shown in FIGS. 7 and 8, in a fuse unit 200 according to the second embodiment, a plurality of fuse terminal portions 66 each consisting of a bifurcated tuning fork terminal are integrally formed on the other side of a bus bar 10.

[0049] In the fuse unit 200, the first housing 31 and the second housing 32 constituting the housing 30 are formed with cover portions 45, 46, respectively. By combining the first housing 31 and the second housing 32, a fuse cavity 47 that covers and accommodates a plurality of fuse terminal portions 66 of the busbar 10 is formed in the housing 30. A fuse 63 is inserted from above into the fuse cavity 47 formed in the housing 30. The fuse 63 inserted into the fuse cavity 47 is connected to the fuse terminal portions 66 formed on the busbar 10.

[0050] According to the fuse unit 200 according to the second embodiment, the fuse terminal portion 66 is integrally formed on the other side portion of the bus bar 10, thereby making it possible to improve extensibility while suppressing an increase in costs due to an increase in the number of parts.

[0051] The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, etc. In addition, the material, shape, size, number, arrangement location, etc. of each component in the above-described embodiment are arbitrary as long as the present invention can be achieved, and are not limited.

[0052] Here, the features of the fuse unit according to the embodiment of the present invention described above will be briefly summarized and listed in the following [1] to [4]. [1] A fuse unit (100, 200) including a bus bar (10) having a plurality of terminal connection portions and a housing (30) that accommodates the bus bar (10), The bus bar (10) is A main body portion (11), a first terminal connection portion (12) formed in parallel on one side of the main body portion (11); a second terminal connection portion (14) formed on the other side of the main body portion (11); a fusible portion (13) provided between at least one of the plurality of first terminal connection portions (12) and the main body portion (11) and connecting the main body portion (11) and the first terminal connection portion (12); having A fuse terminal portion (66) to which a fuse (63) can be connected is provided on the other side portion of the body portion (11), A light-transmitting cover (50) that covers the fusible portion (13) is fitted into the housing (30). Fuse unit.

[0053] [2] The fuse terminal portion (66) is formed on a separate extension bus bar (61), The extension bus bar (61) has a joint portion (65) that clamps and connects the other side portion of the main body portion (11) of the bus bar (10). 1. The fuse unit according to claim 1.

[0054] [3] A plurality of extension bus bars (61) are connectable to the other side of the main body portion (11) of the bus bar (10). The fuse unit according to [2] above.

[0055] [4] The fuse terminal portion (66) is integrally formed on the other side portion of the body portion (11) of the bus bar (10), The housing (30) is formed with a fuse cavity (47) in which the fuse terminal portion (66) is accommodated. 1. The fuse unit according to claim 1. [Explanation of symbols]

[0056] 10 Bus bar 11 Main body 12 First terminal connection part 13 Soluble part 14 Second terminal connection 14a Fastening hole 15 Joint 30 Housing 31 1st Housing 32 Second Housing 33 Window 35 Connection 36 Bulkhead 37 Storage unit 38 Storage slit 39 Nut 47 Fuse Cavity 50 Translucent cover 60,60A Fuse Block 61 Expansion bus bar 62 Fuse housing 63 Fuse 65 Joint 66 Fuse terminal 100,200 Fuse unit

Claims

1. A fuse unit comprising: a bus bar having a plurality of terminal connection portions; and a housing that accommodates the bus bar, The bus bar includes: A main body portion, a first terminal connection portion formed in parallel on one side of the main body portion; a second terminal connection portion formed on the other side of the main body portion; a fusible portion provided between at least one of the plurality of first terminal connection portions and the main body portion to connect the main body portion and the first terminal connection portion; having a fuse terminal portion to which a fuse can be connected is provided on the other side of the main body portion; A light-transmitting cover that covers the fusible portion is fitted into the housing, the fuse terminal portion is integrally formed on the other side portion of the body portion of the bus bar, the housing includes a first housing and a second housing that sandwich and accommodate the bus bar, The first housing and the second housing are each provided with a cover portion corresponding to a position of the fuse terminal portion, When the first housing and the second housing are combined, a fuse cavity in which the fuse terminal portion is accommodated is defined by the cover portions of the first housing and the second housing. Fuse unit.

2. A fuse unit comprising a bus bar having a plurality of terminal connection portions and a housing for accommodating the bus bar, The bus bar includes: A main body portion, a first terminal connection portion formed in parallel on one side of the main body portion; a second terminal connection portion formed on the other side of the main body portion; a fusible portion provided between at least one of the plurality of first terminal connection portions and the main body portion to connect the main body portion and the first terminal connection portion; having a fuse terminal portion to which a fuse can be connected is provided on the other side of the main body portion; A light-transmitting cover that covers the fusible portion is fitted into the housing, The fuse terminal portion is formed on a separate extension bus bar, the extension bus bar has a joint portion that sandwiches and connects the other side portion of the main body portion of the bus bar, Fuse unit.

3. a plurality of extension bus bars are connectable to the other side of the main body of the bus bar; The fuse unit according to claim 2 .

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