JP2009290976A - Power distribution box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve radiation property of heat generation in a power distribution box. <P>SOLUTION: In the power distribution box, a fuse relay block 3 where a terminal of a power line terminal connected to a fuse and a relay is inserted and restrained from one end side and the fuse and the relay are inserted/connected from the other end side, and an electronic control unit 5 storing a power distribution control substrate 4 in the case are stored inside the box 2. The electronic control unit 5 and the fuse relay block 3 are connected by a relay wiring material 10 of high heat dissipation, which is formed of aluminum etc., and the relay wiring material 10 is wired inside the box 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power distribution box, and more particularly, to achieve heat dissipation of heat generated in an electronic control unit that houses a control board for power distribution mounted on an automobile and a fuse / relay block.

Conventionally, in many cases, a power distribution box mounted in an engine room of an automobile accommodates an electronic control unit that accommodates a control board for power distribution and a fuse / relay block.
In the power distribution box, since heat is generated from the elements mounted on the control board in the electronic control unit and the inside of the unit is easily heated, it is necessary to dissipate heat. In addition, the fuse / relay block also needs to dissipate heat because heat is likely to be generated particularly in the relay.

As a means for radiating heat, various ideas such as attaching a metal heat radiating plate to the side surface of the box have been made.
Further, in Japanese Patent Laid-Open No. 2000-91778, as shown in FIG. 11, a wiring board 103 in which a fuse 101 and a relay 102 are mounted on the front surface is housed in a box 100 and connected to the back surface of the wiring board 103. The wire bundle 105 is drawn out from the box 100 to the outside, and the heat cooling element 107 of the cooling means 106 is brought into contact with the wire bundle 105 to absorb heat.

  When the wire bundle 105 drawn out from the box 100 is absorbed by the cooling means 106 provided outside the box, the heat can be radiated through the wire bundle, but it is necessary to provide the cooling means 106 as a separate component from the box 100. There is. Therefore, there is a problem that the cost is increased and the installation space for the cooling means 106 is required, resulting in an increase in size.

JP 2000-91778 A

  The present invention solves the heat dissipation of the power distribution box inside the box without providing a cooling means separate from the box, does not increase the cost, suppresses the enlargement of the power distribution box, and is installed. The problem is to prevent an increase in space.

In order to solve the above-mentioned problems, the present invention is a fuse in which a terminal of a power line terminal connected to a fuse and a relay is inserted and locked from one end side and the fuse and relay are inserted and connected from the other end side inside the box.・ Contains the relay block and the electronic control unit that houses the control board for power distribution in the case.
An in-vehicle power distribution box is provided, wherein the electronic control unit and the fuse / relay block are connected by a high heat dissipation relay wiring material, and the relay wiring material is wired inside the box. Yes.

In the present invention, in the power distribution box, the heat generated on the electronic control unit side and the fuse relay are connected by connecting the fuse / relay block and the electronic control unit for power distribution with a relay wiring material having high heat dissipation. Both the heat generated on the block side is radiated through the connection path by using a highly heat radiating wiring material as a wiring material for connecting them.
As described above, since heat is dissipated inside the power distribution box, it is not necessary to provide a cooling means outside as in the above-mentioned patent document, and it is possible to suppress an increase in the size of the power distribution box and to reduce the cost. It can be prevented from becoming high.

As the high heat dissipation relay wiring material, a flat wiring material in which conductors made of aluminum or copper are parallel-wired and covered with an insulating film is used.
Since aluminum and copper have good thermal conductivity and are only covered with an insulating film, when the conductor of the electronic control unit and one end of the relay wiring material are connected, the heat of the electronic control unit is relayed. Heat can be dissipated through the material. Similarly, by connecting the other end of the relay wiring material to the fuse and relay block fuse and the wiring on the output side of the relay, heat generated by the relay and fuse can be radiated through the flat wiring material.
In particular, as the flat wiring material, from the viewpoint of heat dissipation, a flat conductor made of aluminum or a conductor made of a braided wire of aluminum wire is preferably used.

  Further, the length of the flat wiring material is longer than the shortest dimension between the electronic control unit and the fuse / relay block, and the flat wiring material is bent, detoured, or bent and meandered. In order to increase heat dissipation, the length may be increased. As described above, when the flat wiring material having high heat dissipation is lengthened, the volume in the box has a margin.

Inside the box, the electronic control unit and the fuse / relay block are arranged in parallel in the horizontal direction, and connectors are connected to both ends of the flat wiring member. One connector is a conductor of the power distribution board of the electronic control unit. It is preferable that the connected board-mounted power input connector is fitted and connected, and the other connector is connected to the power output connector provided in the fuse / relay block.
With this configuration, the electronic control unit and the fuse / relay block can be connected to the relay wiring material made of a flat wiring material in a one-touch manner. Therefore, after the electronic control unit and the fuse / relay block are accommodated and locked in the power distribution box, it is only necessary to connect the flat wiring member to the connector, and the assembly work of the power distribution box can be simplified.

The electronic control unit includes a board-mounted load-side connector connected to an output end of a conductor of the power distribution board, and the load-side connector is fitted with a connector connected to a terminal of an external harness.
Since heat dissipation in the electric control unit is performed by the relay wiring material having the high heat dissipation property, it is not necessary to cool the wire group connected to the electronic control unit and drawn to the outside as in Patent Document 1, and the external harness In this respect, the connection structure between the power distribution box and the wire harness can be simplified.

In the control board for power distribution in the electronic control unit, the power circuit provided on the insulating board is preferably formed with a thick or / and wide conductor pattern.
The conductor of the control board in the electronic control unit is connected to the relay wiring material through the power input connector, and the heat from the fuse / relay block is transmitted, so that the conductor can be conducted by increasing the volume or area of the conductor itself. The generated heat can be dissipated. In particular, a conductor serving as an earth circuit can be effectively used as a heat dissipating material if it has a wide area covering the substrate surface as much as possible.

  As described above, in the power distribution box of the present invention, the electronic control unit and the fuse / relay block are wired with a high heat dissipation relay wiring material, and heat is radiated by the relay wiring material at the time of relay connection. It is not necessary to provide a cooling means or the like outside the battery, and heat generated by the electronic control unit and the fuse / relay box can be radiated easily and efficiently.

Hereinafter, an embodiment of a power distribution box of the present invention will be described with reference to the drawings.
1 to 7 show a power distribution box according to the first embodiment.

  The power distribution box 1 is mounted in the engine room of the automobile. As shown in FIGS. 1 and 2, the power distribution box 1 includes a partition wall 2b inside a peripheral wall 2a, and a fuse / relay block 3 and a power distribution in the frame-shaped box 2 whose upper and lower surfaces are open. And an electronic control unit 5 containing the electronic control board 4 for use. The fuse / relay block 3 and the electronic control unit 5 are connected to each other via a relay wiring material 10 made of a flexible flat harness (flat wiring material) having a high heat dissipation wiring conductor. Housed in box 2.

  The fuse / relay block block 3 and the electronic control unit 5 are accommodated in the accommodating portions A and B surrounded by the peripheral wall 2a and the partition wall 2b, respectively. The housed fuse / relay block 3 and the electronic control unit 5 are fixed by locking the lock portion 2c provided on the inner surface of the peripheral wall 2a and the partition wall 2b with the lock portion 5a provided on the outer peripheral surface of the electronic control unit 5. Yes. As shown in FIG. 3, the fuse / relay block 3 is similarly provided with a lock portion 3c and fixed to the peripheral wall 2a and the partition wall 2b with the lock 2c.

  As shown in FIGS. 1 and 2, the fuse / relay block 3 includes a relay mounting portion 3 a disposed on the left side of the box 2 and a fuse mounting portion 3 b disposed along the back side of the box 2. It is L-shaped in plan view. As shown in FIG. 4, the relay mounting portion 3a and the fuse mounting portion 3b are each provided with a plurality of terminal accommodating chambers 13c. In these terminal accommodating chambers 13c, the terminal Wt of the terminal of the power supply line W1 is inserted and locked from the lower end, and the terminals of the fuse 6 and the relay 7 are inserted and connected from the upper end.

  The power line W1 is connected to the battery, and is connected to the fuse 6 and the input terminals 6a and 7a of the relay 7 as shown in the electric circuit of FIG. The fuse 6 and the output terminals 6 b and 7 b of the relay 7 are connected to output lines 8 and 9, respectively, and these output lines 8 and 9 are connected to the power output connector 12. As shown in FIG. 6, the power output connector 12 is fitted and fixed to a connector mounting opening 2d provided in the partition wall 2b to form a standby connector.

The electronic control unit 5 accommodates and fixes a power distribution control board (printed circuit board) 4 shown in FIG. 7 in a case 17, and a conductor composed of a power distribution conductor 18a and a ground conductor 18b is formed on the upper surface thereof. In addition, the electronic component 19 is mounted on the conductor 18a.
At one end of the control board 4, a load-side connector 23 that is fitted and connected to the power input connector 21 and the connector 22 connected to the terminal of the external harness W2 is mounted. A terminal (not shown) solder-connected to the input end of the conductor 18a is inserted into the power input connector 21, while a terminal (not shown) solder-connected to the output end of the conductor 18a is inserted into the load side connector 23. ing.
The conductors 18a and 18b provided on the control board 4 are formed wide to enhance heat dissipation. In particular, the grounding conductor 18b has as large an area as possible and is used as a heat dissipation conductor. Further, since a large current flows through the power distribution conductor 18a, it is wide and thick.

  The connectors 30 and 31 provided at both ends of the relay wiring member 10 are fitted and connected to the power output connector 12 on the fuse / relay block 3 side and the power input connector 21 of the electronic control unit 5, respectively. .

  As shown in FIGS. 8A to 8C, the relay wiring material 10 is a wiring material in which a flat flat conductor 33 made of aluminum is wired in parallel and insulating resin films 34A and 34B are laminated on both front and back surfaces. Formed from. The connectors 30 and 31 are attached to both ends of the relay wiring member, both ends of the conductor 33 are exposed, and terminals 35 and 36 solder-connected to the conductors 33 are accommodated and locked in the connectors 30 and 31.

  The length of the relay wiring member 10 is larger than the shortest distance dimension connecting the power output connector 21 and the wire input connector 21, and the relay wiring member 10 is loosely arranged so that the connector 30 at one end is fitted to the power output connector 12. The connector 31 at the other end is inserted and fitted into the power input connector 21 of the electronic control unit 5.

  Since the power distribution box 1 is configured as described above, heat is generated in the fuse 6 and the relay 7 on the side of the fuse / relay block 3 connected to the power line W1, and heat is transmitted to the output lines 8 and 9, By connecting the output lines 8 and 9 to the conductor 33 of the relay wiring member 10 having high heat dissipation, heat is radiated in the electrical connection path. Therefore, heat transfer to the electronic control unit 5 side via the relay wiring member 10 can be suppressed. In addition, the heat generated in the electronic component 19 mounted on the control board 4 in the electronic control unit 5 is also connected to the conductor 33 of the relay wiring member 10 via the conductor 18a and the power input connector 21. Heat generated on the unit 5 side can also be radiated by the conductor 33 of the relay wiring member 10. In addition, since the conductors 18a and 18b of the control board 4 have a wide area, heat can be radiated from the conductors 18a and 18b.

As described above, the high heat dissipation relay wiring member 10 is provided in the power distribution box 1, and the fuse / relay block 3 and the power distribution electronic control unit 5 are connected via the relay wiring member 10. Thus, both the heat generated on the fuse / relay block 3 side and the heat generated on the electronic control unit 5 side can be radiated by the relay wiring material.
Thus, it is only necessary to use an aluminum conductor excellent in heat dissipation as the conductor of the relay wiring material, and it is not necessary to attach a heat radiating member to the box or to provide a cooling means for the electric wire outside the box. As a result, an increase in the size of the box can be suppressed, and costs can be reduced.

9 and 10 show a second embodiment.
In the second embodiment, instead of using an aluminum flat wire as the conductor 33 of the relay wiring member 10, a twisted aluminum wire is used as the conductor 33-1, and the conductor 33-1 is wired in parallel and laminated with an insulating film. is doing.
Thus, if the conductor 33 of the relay wiring member 10 is a stranded wire, the flexibility can be improved. Therefore, the relay wiring member 10 is bent and meandered, and the length of the relay wiring member 10 is increased. Thus, if the length of the relay wiring member 10 is increased, the heat dissipation can be further increased. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

The present invention is not limited to the first and second embodiments, and the conductor 33 of the relay wiring member 10 may use high conductivity copper. Also in that case, heat dissipation is improved by making the conductor 33 made of copper into a flat wire or a stranded wire and laminating with a thin insulating film.
In addition, the fuse / relay box does not have an integral structure, and separate fuse blocks and relay blocks are accommodated in the boxes, respectively, and these fuse blocks and relay blocks are respectively distributed through the high heat dissipation relay wiring member 10. It may be connected to the electronic control unit 5 for use.

It is a disassembled perspective view of the power distribution box which concerns on 1st embodiment of this invention. It is a schematic sectional drawing of the said power distribution box. It is a schematic plan view which shows the arrangement | positioning relationship of the fuse relay block accommodated in a power distribution box, and an electronic control unit. It is a partial expanded sectional view of a fuse relay block. It is the schematic which shows the electrical connection path | route of a fuse relay block, a relay wiring material, and an electronic control unit. It is sectional drawing which shows the attachment state of the power supply output connector connected to the fuse of a fuse relay block, and a relay. It is a perspective view of the control board accommodated in an electronic control unit. The relay wiring material is shown, (A) is a perspective view, (B) is a sectional view, and (C) is a sectional view of a connector connecting portion. It is a perspective view which shows the relay wiring material of 2nd Embodiment. It is a principal part enlarged view which shows the wiring form of the relay wiring material of 2nd Embodiment. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power distribution box 2 Box 2a Perimeter wall 2b Partition wall 2c Lock part 3 Fuse / relay block 3a Relay mounting part 3b Fuse mounting part 3c Lock part 4 Control board 5 Electronic control unit 6 Fuse 7 Relay 10 Relay wiring material 12 Power output connector 18 Conductor 19 Electronic component 21 Power input connector 22 Load side connector 31, 32 Connector for relay wiring material 33 Conductor for relay wiring material W1 Power supply line W2 External harness

Claims (5)

Inside the box, the terminal of the power line terminal connected to the fuse and relay is inserted and locked from one end side, and the fuse and relay block from which the fuse and relay are inserted and connected from the other end side, and the control board for power distribution And the electronic control unit housed in the case,
An in-vehicle power distribution box, wherein the electronic control unit and the fuse / relay block are connected by a high heat dissipation relay wiring material, and the relay wiring material is wired inside the box. The high heat dissipation relay wiring material is composed of a flexible flat wiring material in which conductors made of aluminum or copper are parallel-wired and covered with an insulating film,
The length of the flat wiring material is longer than the shortest dimension between the electronic control unit and the fuse / relay block, and the relay wiring material is bent, detoured, or meandered. Power distribution box for vehicles described in 1.   Inside the box, the electronic control unit and the fuse / relay block are arranged in parallel in the horizontal direction, connectors are connected to both ends of the flat wiring member, and one connector is a conductor of the control board accommodated in the electronic control unit. 3. The in-vehicle power distribution box according to claim 2, wherein the power supply input connector is mounted and connected to a connected board-mounted power input connector, and the other connector is connected to a power output connector provided in the fuse / relay block.   The electronic control unit includes a board-mounted load-side connector connected to an output end of a conductor of the control board, and the load-side connector is fitted with a connector connected to a terminal of an external harness. The in-vehicle power distribution box according to claim 3.   5. The vehicle-mounted vehicle according to claim 1, wherein a power supply circuit provided on an insulating substrate is formed with a thick or / and wide conductor pattern on the control board in the electronic control unit. Power distribution box.

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