CN101728138A - Blown fuse component - Google Patents

Abstract

The invention provides a fuse assembly that does not accumulate heat in the box and can suppress the temperature rise in the box. It mainly includes: a first fuse circuit constituting body (2) in which a plurality of terminal parts (13) are formed into a chain; an alternator connection part (27) connected to an alternator and each branch fusible body ( 22) A second fuse circuit structure (3) in which a plurality of terminal parts (23) are formed in a chain and simultaneously connected to the alternator fusible body (7) via the first fuse circuit structure (2) ; Install the first fuse circuit constituting body (2) and the box body (4) of the second fuse circuit constituting body (3). The storage battery connection part (17) is arranged on one side of the casing (4), and the alternator connection part (27) is arranged on the other side of the casing (4). The alternator connection part (27) is provided with an alternator fusible element (7).

Description

Fuse Assembly

technical field

The present invention relates to a chain-shaped high-current fuse assembly having a fuse circuit structure in which terminal parts are connected in a chain through a fusible body.

Background technique

As a conventional fuse unit, there is a product disclosed in Patent Document 1. This fuse unit includes a first fuse circuit configuration, a second fuse circuit configuration, and a case housing these fuse circuit configurations.

The first fuse circuit structure has a battery connection part connected to the battery, and the second fuse circuit structure has an alternator connection part connected to the alternator. The first fuse circuit configuration body and the second fuse circuit configuration body have a connecting plate on which a plurality of terminal portions are formed in a fusible chain via branches.

The first fuse circuit structure and the second fuse circuit structure are accommodated in the box in parallel to each other. These fuse circuit structures have a common terminal portion. The first fuse circuit structure and the second fuse circuit structure When the body is accommodated in the box, these common terminal parts are screwed together by bolts. Thereby, the first fuse circuit configuration body and the second fuse circuit configuration body are electrically connected, and a desired fuse circuit is formed by the first fuse circuit configuration body and the second fuse circuit configuration body.

The terminals of the corresponding side connectors are connected to the plurality of terminal portions of the first fuse circuit configuration body and the second fuse circuit configuration body. In this case, loads are respectively connected to the terminals of the corresponding side connector via cables, and the power supply from the storage battery is distributed and supplied to these loads via the fuse circuit. Furthermore, when a current exceeding a predetermined value is passed through the branch fusible element due to a short-circuit accident on each load side, the branch fusible element will be fused due to heat, thereby preventing an accident due to an overcurrent.

Patent Document 1: Japanese Patent Laid-Open No. 2004-127698

In recent years, with the reduction of vehicle space, miniaturization of the fuse assembly is required, and all the battery connection parts, alternator connection parts and common terminal parts that flow large currents and generate large amounts of heat are located close to each other. In addition, due to downsizing, the gap between the first fuse circuit configuration body and the second fuse circuit configuration body and the case becomes smaller. As a result, heat tends to accumulate in the box, and the temperature in the box rises above the required value, causing problems such as accidental melting of the branch fusible elements.

Contents of the invention

Therefore, an object of the present invention is to provide a fuse unit that can suppress temperature rise in the case without accumulating heat in the case.

The first aspect provides a fuse assembly, which mainly includes: a first fuse circuit constituting body in which a plurality of terminal parts are formed into a chain through a battery connection part connected to a battery and each branch fusible body; The alternator connecting part and each branch fusible body that is connected to the machine form a plurality of terminal parts in a chain shape, and at the same time, the second fuse circuit that is fusible connected to the alternator via the first fuse circuit constituent body A structure; a box for installing the first fuse circuit structure and the second fuse circuit structure, characterized in that the battery connection part is arranged on one side of the box, and The alternator connecting portion is disposed on the other side, and the alternator fusible body is disposed at positions away from the battery connecting portion and the alternator connecting portion.

In the second aspect, on the basis of the first aspect, there is provided a fuse assembly, wherein an opening is formed on the upper part of the box, and the first and second fuse circuit constituents are mounted on the opening from the opening. Inside the box, and the opening is covered with a cover; a guide part is provided on one side and the other side of the cover and the box to guide and discharge the hot air in the box.

In the third aspect, on the basis of the first or second aspect, there is provided a fuse assembly, characterized in that, the first fuse circuit constituent body is connected via a plurality of branched fusible links on the elongated plate-shaped connecting plate. A plurality of terminal portions are formed in a shape, and a terminal portion for a battery is formed on one end side of the connecting plate. The second fuse circuit structure is formed on the elongated plate-shaped connecting plate via a plurality of branch fusible elements. A plurality of terminal portions are formed, and a terminal portion for a generator is formed on the other end side of the connecting plate, and the terminal portion for the battery is located on one side of the case, and the terminal portion for the alternator is located at the side of the case. In the form of the other side of the case, the first fuse circuit configuration and the second fuse circuit configuration are housed in parallel in the case.

According to the present invention, the battery connection part of the first fuse circuit structure is arranged on one side of the box, and the alternator connection part of the second fuse circuit structure is arranged on the other side of the box. The alternator fusible elements of the first fuse circuit structure and the second fuse circuit structure are arranged away from these connection parts, so even if a large current flows through these connection parts, heat generation can be reduced. caused by thermal interference. Therefore, heat does not accumulate in the box, and a rise in temperature in the box can be suppressed.

Description of drawings

1 shows a fuse assembly according to an embodiment of the present invention, (A) is a plan view, (B) is a front view, and (C) is a right side view;

Fig. 2 is the sectional view of M-M line in Fig. 1;

Fig. 3 is a sectional view showing main parts.

Symbol Description

1 fuse assembly

2 The first fuse circuit structure

3 The second fuse circuit structure

4 cabinets

7 Generator Fusible

11, 21 connecting plate

12, 22 branch fusible body

13, 23 female terminal part

14, 24 screw fastening terminal part

15 Terminal part for storage battery

17 Battery connection part

25 Alternator Terminals

27 alternator connection

33 opening

34 circuit body containment room

38 caps

Detailed ways

Hereinafter, the present invention will be specifically described based on the illustrated embodiments. Figures 1 to 3 show an embodiment of the present invention, Figure 1 is a plan view, a front view and a right side view of a fuse assembly for a chain-like high current, Figure 2 is a cross-sectional view of the M-M line in Figure 1, and Figure 3 is a Enlarged cross-sectional view of main parts.

As shown in FIGS. 1 to 3 , the fuse assembly 1 includes: a first fuse circuit structure 2 serving as a bus bar, a second fuse circuit structure 3 also serving as a bus bar, and these fuse structure bodies 2 and 3 are housed. The casing 4 made of synthetic resin.

As shown in FIG. 2 and FIG. 3 , the first fuse circuit structure 2 includes: a substantially rectangular long plate-shaped connection plate 11 connected in a chain via branch fusible elements 12 in the short side direction of the connection plate 11 . A plurality of female terminal portions 13 in the shape of a screw fastening terminal portion 14 connected via a branch fusible body 12 in the short side direction of the connection plate 11, and a terminal portion 14 connected to one side (right side) of the long side direction of the connection plate 11. The battery terminal part 15.

The branch fusible elements 12 have a narrow crank shape, and a low-melting point metal is riveted and fixed in the middle of the crank shape, and they are fused when a current exceeding a predetermined value is supplied to each of them. Among the plurality of female terminal portions 13 , female terminal portions adjacent to each other are arranged in a chain with the partition wall 31 of the case 4 interposed therebetween.

The battery connection portion 17 is connected to the battery terminal portion 15 . The battery connection portion 17 protrudes from the outside of the case 4 as shown in FIG. 1 , and is connected to the on-vehicle battery via an unillustrated wire harness.

As shown in FIG. 2 and FIG. 3 , the second fuse circuit structure 3 includes: a substantially rectangular long plate-shaped connection plate 21 , which is connected in a chain via branch fusible elements 22 in the short side direction of the connection plate 21 . A plurality of female terminal portions 23 in the shape of a screw fastening terminal portion 24 connected via a branch fusible body 22 in the short side direction of the connecting plate 21, and the other side (left side) in the long side direction of the connecting plate 21 ) to the terminal part 25 for the alternator connected.

The branch fusible body 22 and the branch fusible body 12 in the first fuse circuit structure body 2 are also in the shape of a narrow crank, and the low-melting point metal is riveted and fixed in the middle of the crank shape, and when a current of a specified value or more is applied to each will fuse. The female terminal portion 23 is the same as the female terminal portion of the first fuse circuit structure 2 , and the female terminal portions adjacent to each other are arranged in a chain through the partition wall 32 of the case 4 .

The alternator connecting portion 27 is connected to the alternator terminal portion 25 . The alternator connecting portion 27 protrudes from the outside of the case 4 as shown in FIG. 1 , and is connected to the vehicle-mounted alternator through a wire harness (not shown).

The first fuse circuit configuration body 2 and the second fuse circuit configuration body 3 are connected via an alternator fusible body 7 . The alternator fusible body 7 is formed of a fusible body having a predetermined width. In addition, the alternator fusible body 7 extends in the vertical direction between the connection plate 11 and the connection plate 21, and one end (lower end) is integrated with the connection plate 11 of the first fuse circuit structure 2, and the other end (upper end) ) and the connecting plate 21 of the second fuse circuit structure 3 are integrated. In such a structure, the connecting plate 11 of the first fuse circuit constituent body 2 having the branch fusible body 12, the connecting plate 21 of the second fuse circuit constituent body 3 having the branch fusible body 22, the alternator fusible The body 7 is integrally formed by pressing a conductive flat plate material. That is, in this embodiment, the connection plates 11 and 21 are integrally connected via the alternator fusible body 7, whereby the first fuse circuit structure 2 and the second fuse circuit structure 3 are housed in parallel in the box. In body 4.

A low-melting-point metal is riveted and fixed in the middle of the long-side direction of the alternator fusible body 7 . Therefore, when a current exceeding a predetermined value passes through the alternator fusible element 7, it will fuse.

In the above structure, the battery terminal 15 connected to the battery connection 17 is disposed on one side of the case 4 , and the alternator terminal 25 connected to the alternator connection 27 is disposed on the case 4 . the other side of the In addition, the alternator fusible body 7 is provided between the connection plate 11 of the first fuse circuit structure body 2 and the connection plate 21 of the second fuse circuit structure body 3, and the alternator fusible body 7 is disposed on the The positions are separated from the battery terminal portion 15 (battery connection portion 17 ) and the alternator terminal portion 25 (alternator connection portion 27 ), respectively.

As shown in FIG. 1 , the case 4 is formed in a substantially rectangular parallelepiped shape, the battery connection portion 17 protrudes laterally from one side (right side), and the alternator connection portion 27 faces forward from the other side (left side). protrude.

As shown in FIGS. 2 and 3 , the box body 4 has a circuit body housing chamber 34 having an opening 33 on its inside. A connector box portion 35 and a terminal support portion 37 are provided below the circuit body housing chamber 34 . The opening 33 is configured to house the first fuse circuit configuration 2 and the second fuse circuit configuration 3 in the case 4 . The terminal support portion 37 supports the terminal portion 14 for screw fastening of the first fuse circuit assembly 2 and the terminal portion 24 for screw fastening of the second fuse circuit assembly 3 . A transparent cover 38 is attached above the box body 4 , and the opening 33 is blocked by the cover 38 .

The cover 38 is attached along the longitudinal direction of the case 4 so as to cover the opening 33 . A tapered portion 41 is formed on one side (right side) of the connecting plate 11 in the longitudinal direction of the cover 38 . That is, the tapered portion 41 is formed at a position close to the battery terminal portion 15 . The tapered portion 41 is formed to incline upward from the upper end of the case 4 . In addition, a tapered portion 43 is also formed on the other side portion (left side portion) on the connecting plate 21 side in the longitudinal direction of the cover 38 . The tapered portion 43 is formed at a position close to the alternator terminal portion 25 . Like the tapered portion 41 , the tapered portion 43 is formed to incline upward from the upper end of the case 4 . Such inclined tapered portions 41 and 43 serve as guide portions for guiding and discharging the hot air in the box 4 to the outside.

In the above configuration, the power supply from the battery or the alternator is distributed and supplied to each load via the fuse circuits 2 and 3 of the fuse unit 1 . In addition, when the power supply of the battery decreases, the battery is charged by supplying power to the battery from the alternator.

In the above configuration, when a current exceeding a predetermined value passes through the branch fusible elements 12, 22 due to a short-circuit accident on the load side, the branch fusible elements 12, 22 are fused by heat, thereby preventing accidents due to overcurrent. In addition, when performing maintenance or inspection of the fuse unit 1 , by peeping into the case 4 through the transparent cover 38 , the state of the internal branch fusible elements 12 and 22 (whether there is a fuse or not) can be checked.

In the above structure, the battery terminal portion 15 connected to the battery connection portion 17 and the alternator terminal portion 25 connected to the alternator connection portion 27 generate heat due to a large current flowing therethrough. Also, the alternator fuse 7 electrically connecting the connection plates 11 and 21 generates heat due to the flow of a large current. In contrast, in this embodiment, the terminal portion 15 for the battery is disposed on one side of the case 4, the terminal portion 25 for the alternator is disposed on the other side of the case 4, and the alternator is fusible. The body 7 is arranged at a position separated from these battery terminal portions 15 and generator terminal portions 25 . Therefore, even if there is heat generated from these parts, thermal interference can be suppressed, heat will not be accumulated in the box 4, and the temperature rise in the box 4 can be suppressed.

In addition, in this embodiment, taper portions 41 and 43 as guide portions are formed on the lid 38 covering the opening portion 33 of the box body 4 . Moreover, the tapered part 41 is formed at a position close to the battery terminal part 15, and the tapered part 43 is formed at a position close to the generator terminal part 25. Therefore, heat from the battery terminal part 15 and heat from the generator terminal part 15 can be absorbed. The heat of the terminal portion 25 is directly discharged to the outside of the case 4 through the tapered portions 41 and 43 . In Fig. 3, arrow Y indicates heat movement. Due to such heat transfer, the heat is discharged from the box 4 , so that the temperature rise of the box 4 can be further suppressed.

In addition, in this embodiment, the first fuse circuit configuration body 2 and the second fuse circuit configuration body 3 are in a state of being connected via the alternator fusible body 7 , and can be accommodated in a side-by-side state in the case 4 . Therefore, it is not necessary to separately house two circuit constituent bodies in the case 4 and to electrically connect them. Therefore, the assembly of the fuse unit 1 can be easily performed.

Claims (3)

1. A fuse assembly, which mainly includes: a first fuse circuit constitution body forming a plurality of terminal portions in a chain shape via a battery connection portion connected to the battery and each branch fusible body; A second fuse circuit configuration body that forms a plurality of terminal portions in a chain through an alternator connection portion connected to an alternator and each branch fusible body, and simultaneously, via the first A fuse circuit body is fusibly connected to the alternator; housings for installing the first fuse circuit constituting body and the second fuse circuit constituting body, It is characterized in that, The battery connection part is arranged on one side of the box body, and the alternator connection part is arranged on the other side part of the box body. The location of the part is configured with the generator fusible. 2. The fuse assembly according to claim 1, characterized in that, An opening is formed on the upper part of the box, and the first and second fuse circuit components are installed in the box through the opening, and the opening is covered with a cover; One side and the other side of the cover and the box body are provided with a guide portion for guiding and discharging the hot air in the box to the outside. 3. The fuse assembly according to claim 1 or 2, characterized in that, In the first fuse circuit structure, a plurality of terminal portions are formed on a long plate-shaped connecting plate via a plurality of branches in a chain shape of a fuse, and a terminal portion for a battery is formed on one end side of the connecting plate. , In the second fuse circuit structure, a plurality of terminal portions are formed on a long plate-shaped connecting plate via a plurality of branched fusible elements, and a terminal portion for an alternator is formed on the other end side of the connecting plate. the first fuse circuit structure and the second The fuse circuit components are housed in parallel in the case.

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