JP5400348B2 - Fusible link unit - Google Patents

Description

  The present invention relates to a fusible link unit for a chain type large current having a fuse circuit structure in which terminal portions via fusible members are connected in a chain.

  There exists a thing shown by patent document 1 as a conventional fusible link unit. The fusible link unit includes a first fuse circuit structure, a second fuse circuit structure, and a housing in which these fuse circuit structures are incorporated.

  The first fuse circuit component has a battery connection connected to the battery, and the second fuse circuit component has an alternator connection connected to the alternator. These first fuse circuit structure and second fuse circuit structure have a connecting plate, and a plurality of terminal portions are formed in a chain on the connecting plate via a branch soluble body.

  The first fuse circuit structure and the second fuse circuit structure are accommodated in the housing so as to be parallel to each other. These fuse circuit structures have a common terminal portion, and the first fuse circuit When the structural body and the second fuse circuit structural body are accommodated in the housing, these common terminal portions are fastened together by bolts. Thus, the first fuse circuit configuration body and the second fuse circuit configuration body are electrically connected, and a desired fuse circuit is configured by the first fuse circuit configuration body and the second fuse circuit configuration body.

The terminals of the mating connector are connected to the plurality of terminal portions of the first fuse circuit structure and the second fuse circuit structure. In this case, loads are connected to the terminals of the mating connector via cables, respectively, and power from the battery is distributed and supplied to these loads via the fuse circuit. When a predetermined current or more is passed through the branch fusible body due to a short circuit accident or the like on each load side, the branch fusible body melts due to heat generation, and an accident based on overcurrent is prevented.
JP 2004-127698 A

  In recent years, miniaturization of fusible link units has been demanded as the vehicle space has decreased, and in all cases, battery connection parts, alternator connection parts, and common terminal parts that have large current flows and generate large amounts of heat are close to each other. Yes. In addition, the clearance between the first and second fuse circuit components and the housing is reduced by downsizing. As a result, heat easily accumulates in the housing, the temperature in the housing rises more than necessary, and there is a problem that, for example, the branched fusible body is inadvertently blown out.

  Therefore, an object of the present invention is to provide a fusible link unit capable of suppressing a temperature rise in the housing without heat trapping in the housing.

A fusible link unit according to a first aspect of the present invention includes a battery connection portion connected to a battery, a first fuse circuit configuration body in which a plurality of terminal portions are formed in a chain through each branch soluble body, and an alternator. A plurality of terminal portions are formed in a chain through the connected alternator connecting portion and each branch fusible body, and the second fuse circuit constituent body is connected via the first fuse circuit constituent body and the alternator fusible body. And a fusible link unit formed by a housing in which the first fuse circuit component and the second fuse circuit component are mounted, wherein the first fuse circuit component is a long plate-like connection A plurality of terminal portions are formed in a chain on the plate through a plurality of branched fusible bodies, a battery terminal portion is formed on one end side of the connection plate, and the second fuse circuit In the adult, a plurality of terminal portions are formed on a long plate-like connecting plate via a plurality of branch soluble bodies, an alternator terminal portion is formed on the other end side of the connecting plate, and the battery terminal portion is The first fuse circuit component and the second fuse circuit component are arranged side by side in the housing so as to be located on one side of the housing, and the alternator terminal portion is located on the other side of the housing, and the housing the opening is formed in the upper, from said opening first, second fuse circuit structure is mounted in the housing, the opening is covered with the cover, one side and the other side of the cover A taper portion is provided as a guide portion for guiding and discharging the hot air in the housing outward.

  According to the present invention, the battery connection part of the first fuse circuit structure is disposed on one side of the housing, the alternator connection part of the second fuse circuit structure is disposed on the other side of the housing, and further the first fuse circuit structure Since the alternator fusible body for connecting the body and the second fuse circuit constituting body is arranged at a position separated from these connecting portions, even if a large current flows through them, thermal interference due to heat generation can be reduced. For this reason, heat does not accumulate in the housing, and the temperature rise in the housing can be suppressed.

  Hereinafter, the present invention will be described in detail with reference to embodiments illustrated in the drawings. 1 to 3 show an embodiment of the present invention, FIG. 1 is a plan view, a front view and a right side view of a fusible link unit for a chain type large current, and FIG. M line sectional drawing and FIG. 3 are the expanded sectional views of the principal part.

  As shown in FIGS. 1 to 3, the fusible link unit 1 includes a first fuse circuit structure 2 that is a bus bar, a second fuse circuit structure 3 that is also a bus bar, and these fuse structures 2 and 3. And a housing 4 made of synthetic resin.

  As shown in FIGS. 2 and 3, the first fuse circuit component 2 includes a long plate-like connecting plate 11 having a substantially rectangular shape, and a branch fusible body 12 in the short direction of the connecting plate 11. A plurality of female terminal portions 13 connected in a chain manner, a screw-fixing terminal portion 14 connected via a branch soluble body 12 in the short direction of the connection plate 11, and one longitudinal direction of the connection plate 11. And a battery terminal portion 15 connected to the side (right side).

  The branched fusible body 12 has a narrow crank shape, and a low melting point metal is caulked and fixed in the middle of the crank shape, and is blown when a current of a predetermined value or more is supplied to each of them. It is like that. Adjacent ones of the plurality of female terminal portions 13 are arranged in a chain via the partition wall 31 of the housing 4.

  A battery connecting portion 17 is connected to the battery terminal portion 15. The battery connection part 17 protrudes from the outer surface of the housing 4 as shown in FIG. 1, and is connected to a vehicle-mounted battery via a harness (not shown).

  As shown in FIGS. 2 and 3, the second fuse circuit component 3 includes a long plate-like connection plate 21 having a substantially rectangular shape, and a fusible body 22 branched in the short direction of the connection plate 21. A plurality of female terminal portions 23 connected in a chain form via the screw, a screw-fixing terminal portion 24 connected via a branch soluble body 22 in the short direction of the connection plate 21, and the longitudinal direction of the connection plate 21. And an alternator terminal portion 25 connected to the other side (left side).

  The branch fusible body 22 has a narrow crank shape like the branch fusible body 12 of the first fuse circuit component 2, and a low melting point metal is caulked and fixed in the middle of the crank shape. When a current of a predetermined value or more is supplied to each of them, they are blown out. Similar to the first fuse circuit component 2, adjacent female terminal portions 23 are arranged in a chain via the partition walls 32 of the housing 4.

  An alternator connecting portion 27 is connected to the alternator terminal portion 25. As shown in FIG. 1, the alternator connecting portion 27 protrudes from the outer surface of the housing 4 and is connected to an in-vehicle generator via a harness that is not shown.

  The first fuse circuit component 2 and the second fuse circuit component 3 are connected via an alternator fusible member 7. The alternator soluble body 7 is formed of a soluble body having a predetermined width. Further, the alternator fusible body 7 extends in the vertical direction between the connecting plate 11 and the connecting plate 21, and one end (lower end) is integrated with the connecting plate 11 of the first fuse circuit constituting body 2. The end (upper end) is integrated with the connection plate 21 of the second fuse circuit component 3. In such a structure, the connection plate 11 of the first fuse circuit component 2 having the branch fusible body 12, the connection plate 21 of the second fuse circuit component 3 having the branch fusible member 22, and the alternator fusible member 7. Is integrally formed by pressing a conductive and 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 placed in the housing 4. Contained in parallel.

  In the middle of the alternator fusible body 7 in the length direction, a low melting point metal is caulked and fixed. Therefore, when a current of a predetermined value or more is passed through the alternator fusible body 7, it is blown out.

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

  As shown in FIG. 1, the housing 4 is formed in a substantially rectangular parallelepiped shape, the battery connecting portion 17 projects laterally from one side (right side), and the alternator connecting portion 27 from the other side (left side). Projecting forward.

  As shown in FIGS. 2 and 3, the housing 4 is formed therein with a circuit body accommodation chamber 34 having an opening 33 on the upper side. A connector housing portion 35 and a terminal support portion 37 are provided below the circuit body accommodation chamber 34. The opening 33 accommodates the first fuse circuit component 2 and the second fuse circuit component 3 in the housing 4. The terminal support part 37 supports the screw terminal part 14 of the first fuse circuit structure 2 and the screw terminal part 24 of the second fuse circuit structure 3. A transparent cover 38 is attached above the housing 4, and the opening 33 is blocked by the cover 38.

  The cover 38 is attached so as to cover the opening 33 along the longitudinal direction of the housing 4. A tapered portion 41 is formed on one side portion (right side portion) of the cover 38 in the longitudinal direction on the connecting plate 11 side. That is, the taper portion 41 is formed at a position close to the battery terminal portion 15. The tapered portion 41 is formed so as to incline upward from the upper end of the housing 4. Further, 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. The tapered portion 43 is formed so as to incline upward from the upper end of the housing 4 similarly to the tapered portion 41. Such inclined taper portions 41 and 43 serve as guide portions that guide and discharge the hot air in the housing 4 outward.

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

  In the above configuration, when a current greater than or equal to a predetermined value is applied to the branch fusible bodies 12 and 22 due to a short circuit accident or the like on the load side, the branch fusible bodies 12 and 22 are melted by heat generation, and an accident based on overcurrent is prevented. . When performing maintenance or inspection of the fusible link unit 1, the state of the inner branch fusible bodies 12, 22 (such as the presence or absence of fusing) is checked by looking into the housing 4 through the transparent cover 38. be able to.

  In the above structure, the battery terminal 15 connected to the battery connection 17 and the alternator terminal 25 connected to the alternator connection 27 generate heat because a large current flows. Moreover, since a large current flows through the alternator fusible body 7 that electrically connects the connecting plates 11 and 21, heat is generated. On the other hand, in this embodiment, the battery terminal 15 is disposed on one side of the housing 4, the alternator terminal 25 is disposed on the other side of the housing 4, and the alternator fusible body 7 is the battery. The terminal portion 15 and the alternator terminal portion 25 are arranged at positions separated from each other. For this reason, even if heat is generated from these parts, thermal interference can be suppressed, heat is not trapped in the housing 4, and temperature rise in the housing 4 can be suppressed.

  In this embodiment, the cover 38 covering the opening 33 of the housing 4 is formed with tapered portions 41 and 43 as guide portions. Moreover, since the taper portion 41 is formed at a position close to the battery terminal portion 15 and the taper portion 43 is formed at a position close to the alternator terminal portion 25, the heat from the battery terminal portion 15 and the alternator are used. Heat from the terminal portion 25 can be immediately discharged from the tapered portions 41 and 43 to the outside of the housing 4. In FIG. 3, the arrow Y indicates the movement of heat. Since heat is discharged from the housing 4 by such heat movement, it is possible to further suppress the temperature rise of the housing 4.

  Further, in this embodiment, the first fuse circuit component 2 and the second fuse circuit component 3 are connected via the alternator fusible member 7 and are housed in the housing 4 in a parallel state. Can do. For this reason, it is not necessary to house two circuit components individually in the housing 4 and to electrically connect them. Therefore, the fusible link unit 1 can be easily assembled.

The fusible link unit of one Embodiment of this invention is shown, (A) is a top view, (B) is a front view, (C) is a right view. It is the MM sectional view taken on the line in FIG. It is sectional drawing which shows the principal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fusible link unit 2 1st fuse circuit structure 3 2nd fuse circuit structure 4 Housing 7 Alternator soluble body 11, 21 Connection plate 12, 22 Branch soluble body 13, 23 Female terminal part 14, 24 Screw terminal part DESCRIPTION OF SYMBOLS 15 Battery terminal part 17 Battery connection part 25 Alternator terminal part 27 Alternator connection part 33 Opening part 34 Circuit body accommodation chamber 38 Cover

Claims (1)

A first fuse circuit configuration body in which a plurality of terminal portions are formed in a chain through a battery connection portion connected to a battery and each branch soluble body;
A plurality of terminal portions are formed in a chain through an alternator connecting portion connected to the alternator and each branch fusible body, and a second fuse circuit is connected to the first fuse circuit constituent body via the alternator fusible body. A construct,
A fusible link unit formed by a housing in which the first fuse circuit component and the second fuse circuit component are mounted,
In the first fuse circuit constituting body, a plurality of terminal portions are formed in a long plate-like connection plate via a plurality of branch soluble bodies, and a battery terminal portion is formed on one end side of the connection plate. ,
The second fuse circuit constituting body has a plurality of terminal portions formed on a long plate-like connecting plate via a plurality of branch soluble bodies, and an alternator terminal portion is formed on the other end side of the connecting plate,
The first fuse circuit component and the second fuse circuit component are disposed in the housing such that the battery terminal is located on one side of the housing and the alternator terminal is located on the other side of the housing. Housed side by side,
The housing is formed with an opening at the top, the first and second fuse circuit components are mounted in the housing from the opening, and the opening is covered with a cover,
Fusible link unit, wherein a tapered portion of a guide portion for guiding discharged to the outside of the hot air in the housing on one side and the other side of the cover is provided.

Images