JP4394042B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box mounted on a vehicle such as an automobile.

  In general, vehicles such as automobiles are equipped with various electrical components such as lamps such as head lamps and tail lamps, motors such as starter motors and motors for air conditioners, and batteries and alternators are mounted on these electrical components. An electrical junction box is used to distribute power from a power source.

  In the electrical junction box, the current supplied from the power source is broadly divided into systems such as lamps and motors. On the upstream side of each system circuit, fusible links with larger rated capacities than ordinary fuses are installed. When an excessive current flows, the fusible link first melts and the fusible link is blown. Circuits downstream of the link are protected.

  Downstream of the fusible link, for example, the lamp system circuit is branched into circuits individually connected to the headlamp, tail lamp, etc., and the motor system circuit is individually connected to the starter motor, the air conditioner motor, etc. Branches to a connected circuit. Each of the branched circuits is provided with a fuse. When an excessive current flows, the fuse is blown to protect circuits and electrical components downstream of the fuse.

  Conventionally, in order to facilitate replacement of fusible links and fuses, such an electrical junction box has a wire harness that is a modularized block in which various electronic parts such as fusible links, fuses, and other relays are aggregated by type. Are connected to each other (see, for example, Patent Document 1).

  As shown in FIG. 2, the electrical junction box 1 disclosed in Patent Document 1 is fixed to a partition wall between an engine room and a vehicle compartment of an automobile, and an electrical junction box portion 2 disposed on the engine room side, And an electrical junction box portion 3 disposed on the vehicle compartment side. The fusible link 4 and the fuse 5 are integrated in the electric connection box portion 2 on the engine room side, and electronic components such as a relay 6 and an ECU (electronic control unit) 7 are provided in the electric connection box portion 3 on the vehicle compartment side. It has been aggregated. And the electrical junction box part 2 on the engine room side and the electrical junction box part 3 on the vehicle compartment side are connected by a wire harness 8 routed over both.

JP 2003-219538 A

  In recent years, with the increase in functionality of vehicles such as automobiles, the number of electrical components mounted on the vehicle tends to increase. Accordingly, the number of circuits branched in the electrical junction box also tends to increase. As described above, when blocks in which various electronic components such as fusible links, fuses, and other relays are aggregated by type are connected to each other with wire harnesses, the number of wires bundled with the wire harness increases as the number of circuits increases. There is a risk that the wiring space for the wire harness may be expanded.

  Here, since a relatively large current flows through the fusible link and its heat generation is also large, the fusible link block in which these fusible links are aggregated is aggregated with other blocks, especially various electronic components such as relays. It is preferable to arrange it apart from the block. The wire harness that connects the blocks may have to be bent and routed due to the circumstances of the routing route, but since a relatively large current flows through the fusible link, it is connected to the fusible link. A thick wire is used as the electric wire. These thick wires are difficult to bend, so that the wiring harness connected to the fusible link block may have a particularly large wiring space coupled with an increase in the number of circuits.

  Such an expansion of the wiring harness wiring space is not preferable for reducing the size of the electrical junction box.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an electrical junction box that is miniaturized and further takes measures against heat from a fusible link or the like. .

The above object is achieved by the following electrical connection boxes (1) to ( 4 ) according to the present invention.

(1) A fusible link block containing a plurality of fusible links, a fuse block containing a plurality of fuses arranged in a branch circuit downstream of the fusible link, the fusible link block and the fuse block And a circuit board on which various electronic components are mounted, wherein the fuse block is placed on the circuit board, the fusible link block is stacked on the fuse block, and the fuse The electrical connection box , wherein the bullink block and the fuse block are connected to each other by a bus bar forming the branch circuit.

( 2 ) The fuse block is placed on the edge of the circuit board, and the fusible link block is stacked on the fuse block in a stepped manner so as to protrude from the edge of the circuit board. ( 1 ) The electrical junction box characterized by the above-mentioned.

( 3 ) The circuit body disposed upstream of each fusible link is routed in parallel to the board surface of the circuit board, and a partition plate is provided between the circuit body and the circuit board. ( 1 ) or the electrical junction box as described in ( 2 ) characterized by these.

( 4 ) The fusible link is a screw-type fusible link that is screwed to the mounting portion of the fusible link block together with the bus bar and the terminal portion of the circuit body, and the mounting portion is the fusible link (4) The electrical junction box according to (4), wherein the electrical connection box is provided in a portion of the link block that protrudes from an edge of the circuit board.

According to the electrical connection box described in the above (1), the fusible link block and the fuse block are stacked and mounted on the circuit board, so that it is easy to connect them with the bus bar. And a wire harness is reduced by connecting a fusible link block and a fuse block with the bus bar which forms a branch circuit, and, thereby, size reduction of an electrical junction box can be achieved.
In addition, since the fusible link blocks are stacked on the fuse block mounted on the circuit board, the fusible link generating relatively large heat is disposed away from the circuit board. Thereby, the influence which the heat from a fusible link has on the various electronic components of a circuit board can be reduced.

According to the electrical connection box described in ( 2 ) above, the fusible link block protruding from the edge of the circuit board causes the fusible link generating a relatively large amount of heat to be arranged further away from the circuit board. Thereby, the influence which the heat from a fusible link has on the various electronic components of a circuit board can be reduced further.

According to the electrical connection box described in ( 3 ) above, the fusible link block is stacked on the fuse block and arranged away from the circuit board, and the circuit body disposed upstream of the fusible link is provided. By being arranged in parallel to the circuit board, a gap is provided between the circuit body and the circuit board, and a partition plate is provided in this gap. Here, a relatively large current flows through the circuit body upstream of the fusible link as in the fusible link. Therefore, the circuit body generates a large amount of heat. The influence of the heat from the body on the various electronic components of the circuit board can be reduced.
In addition, it is possible to leave a gap between the circuit body and the circuit board by simply arranging the circuit body in parallel with the circuit board without bending the circuit body away from the circuit board. There is no extra bending wrinkle and heat dissipation is excellent.

According to the electrical connection box described in ( 4 ) above, the attachment portion is provided in the portion that protrudes from the edge of the circuit board in the fusible link block. A working space is secured when the fusible link is screwed to the mounting portion. Thereby, the screwing operation of the fusible link can be facilitated.

  According to the present invention, it is possible to provide an electrical junction box that is reduced in size and that takes measures against heat from a fusible link or the like.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an embodiment of an electrical junction box according to the present invention.

  As shown in FIG. 1, the electrical junction box 10 of the present embodiment includes a bottomed cylindrical case body 11, an upper cover 12 attached to the upper portion of the case body 11 so as to cover the upper opening of the case body 11, A lower cover 13 attached to the bottom of the case body 11 is provided so as to cover the output connector 14 provided on the bottom surface of the case body 11.

  In the case body 11, a fusible link block 15 containing a plurality of fusible links, a fuse block 16 containing a plurality of fuses, and various electronic devices such as the fusible link block 15, the fuse block 16 and a relay. A circuit board 18 on which a component 17 is mounted is accommodated.

  Here, the circuit configuration of the electrical junction box 10 will be briefly described. First, the current supplied from the power source to the electrical junction box 10 is roughly divided into several systems. Fusible links are respectively arranged on the upstream side of the circuits of each system, and these fusible links are accommodated in the fusible link block 15 and aggregated. When an excessive current flows in the circuits of each system, the fusible link is first melted to protect the downstream circuit of the fusible link.

  The circuits of each system are branched downstream of the fusible link. Each of the branched circuits is provided with a fuse, and these fuses are accommodated in a fuse block 16 and integrated. When an excessive current flows through each branched circuit, the fuse is blown to protect the circuit downstream of the fuse.

  Referring to FIG. 1 again, the circuit board 18 is arranged in a standing state with respect to the bottom surface of the case body 11, and the fusible link block 15 and the fuse block 16 are mounted on the circuit board 18 adjacent to each other. Yes. More specifically, the fuse block 16 is placed on the upper edge 18 a of the circuit board 18 facing the upper opening of the case body 11, and the fusible link block 15 is located above the upper edge 18 a of the circuit board 18. The protrusions are stacked on the fuse block 16 and mounted on the circuit board 18 so as to protrude.

  The upstream circuit of the fusible link is formed of a circuit body 19 such as an electric wire or a bus bar, for example, and the circuit body 19 is arranged in parallel to the circuit board 18 and is connected to the bottom of the case body 11 from the fusible link block 15. It is connected to a connector (not shown) that extends toward the power source and leads to a power source. A branch circuit branching downstream of the fusible link is formed by a bus bar 20, and the fusible link block 15 and the fuse block 16 are directly connected by the bus bar 20.

  The fusible link block 15 is stacked on the fuse block 16 so as to be spaced apart from the circuit board 18, and is arranged parallel to the circuit board 18 from the fusible link block 15 toward the bottom of the case body 11. There is a gap between the circuit body 19 and the circuit board 18. A partition plate 23 erected on the bottom surface of the case body 11 is disposed in the gap.

  In the present embodiment, the fusible link is a screwed fusible link that is screwed to the attachment portion 15 a of the fusible link block 15 together with the terminal portion 19 a of the circuit body 19 and the terminal portion 20 a of the bus bar 20. The mounting portion 15a is provided in a portion of the fusible link block 15 that is disposed so as to protrude above the upper edge portion 18a of the circuit board 18, and in the vicinity of the screw insertion hole 15b formed in the mounting portion 15a. Sufficient work space is secured.

  The downstream of the fuse is connected to a circuit formed on the circuit board 18 via a circuit body 21 such as an electric wire, a bus bar, or a lead terminal of the fuse, and is connected to the output connector 14 through various electronic components 17. . Further, the downstream of some fusible links having a small rated capacity is also connected to a circuit formed on the circuit board 18 via the circuit body 22, and various electronic components 17 are relayed and connected to the output connector 14. .

  According to the electrical connection box 10 of the present embodiment, the fusible link block 15 and the fuse block 16 are mounted on the circuit board 18 adjacent to each other, so that it is easy to connect them with a bus bar. And the wire harness is reduced by connecting the fusible link block 15 and the fuse block 16 with the bus bar 20 which forms a branch circuit, and, thereby, size reduction of the electrical junction box 10 can be achieved.

  Further, according to the electrical connection box 10 of the present embodiment, the fuse block 16 is placed on the circuit board 18 facing the upper opening of the case body 11, and the fusible link block 15 is stacked on the fuse block 16. For this reason, the fusible link that generates a relatively large amount of heat is disposed away from the circuit board 18. Thereby, the influence which the heat from a fusible link has on the various electronic components 17 of the circuit board 18 can be reduced.

  Further, according to the electrical connection box 10 of the present embodiment, the fusible link block 15 protrudes from the upper edge portion 18a of the circuit board 18 so that the fusible link with relatively large heat generation is further separated from the circuit board 18. Are arranged. Thereby, the influence which the heat from a fusible link has on the various electronic components 17 of the circuit board 18 can be further reduced.

Further, according to the electrical junction box 10 of the present embodiment, the fusible link block 15 is stacked on the fuse block 16 and is disposed away from the circuit board 18 and is disposed upstream of the fusible link. Since the circuit body 19 is arranged in parallel with the circuit board 18, a gap is provided between the circuit body 19 and the circuit board 18, and a partition plate 23 is provided in this gap. Here, a relatively large current flows through the circuit body 19 upstream of the fusible link as in the fusible link. Therefore, although the circuit body 19 generates a large amount of heat, it is provided between the circuit body 19 and the circuit board 18. The partition plate 23 can reduce the influence of heat from the circuit body 19 on the various electronic components 17 of the circuit board 18.
Further, it is possible to leave a gap between the circuit body 19 and the circuit board 18 by simply arranging the circuit body 19 in parallel with the circuit board 18 without bending the circuit body 19 apart from the circuit board 18. Therefore, the circuit body 19 is not excessively bent and excellent in heat dissipation.

  Further, according to the electrical junction box 10 of the present embodiment, the mounting portion 15a is provided at a position protruding from the upper edge portion 18a of the circuit board 18 in the fusible link block 15, so that the bus bar 20 and the circuit body 19 are provided. A working space is secured when the fusible link is screwed to the mounting portion 15a together with the terminal portion. Thereby, the screwing operation of the fusible link can be facilitated.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

It is a schematic block diagram of one Embodiment of the electrical-connection box which concerns on this invention. It is a perspective view of the conventional electrical junction box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electrical junction box 11 Case main body 12 Upper cover 13 Lower cover 14 Output connector 15 Fusible link block 15a Mounting part 15b Screw insertion hole 16 Fuse block 17 Various electronic components 18 Circuit board 19 Circuit body 20 Busbar 21 Circuit body 22 Circuit body 23 Partition Board

Claims (4)

A fusible link block containing a plurality of fusible links;
A fuse block containing a plurality of fuses disposed in a branch circuit downstream of the fusible link;
A circuit board on which the fusible link block, the fuse block, and various electronic components are mounted;
An electrical junction box comprising:
The fuse block is mounted on the circuit board;
The fusible link block is stacked on the fuse block;
Electrical connection box, characterized in that said fusible link block and the fuse block are connected to each other by a bus bar which forms the branch circuit. The fuse block is mounted on an edge of the circuit board;
The electrical connection box according to claim 1, wherein the fusible link block is stacked on the fuse block in a stepped manner so as to protrude from an edge of the circuit board. A circuit body disposed upstream of the fusible link is routed parallel to the circuit board,
The electrical junction box according to claim 1, wherein a partition plate is provided between the circuit body and the circuit board. The fusible link is a screw-type fusible link that is screwed to the mounting portion of the fusible link block together with the bus bar and the terminal portion of the circuit body,
The electrical connection box according to claim 3, wherein the attachment portion is provided at a portion of the fusible link block that is disposed so as to protrude from an edge portion of the circuit board.

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