JP2006254527A - Electric connection box for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a special case for storing a power distributer and make the bus bar of the power distributer and a bus bar to be fixed to an insulating board, using the same die. <P>SOLUTION: The power distributer, 100 where a bus bar 21 is fixed to the opposite side of a printed board 20 from a printed conductor, and the insulating plate 30, where the bus bar 31 of a bus bar stack 38 is fixed, are juxtaposed in the horizontal direction. The bus bar 21 fixed to the printed board 20 and the bus bar 31 fixed to the insulating board 30 are made, being punched out from the same conductive metal plate, and they are arranged continuously on the same plane. The power distributer 100 is stored in one common case consisting of an upper case 11 and the lower case 12 together with the insulating plate 30 where the bus bar 31 is fixed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrical junction box for automobiles, and more particularly, an electrical junction box that accommodates a power distributor having a bus bar fixed to a printed circuit board, the configuration of which is simplified.

In recent years, with the increase in functionality of automobiles, the number of in-vehicle electrical components has increased rapidly, and the number of electrical circuit systems in the vehicle has increased. Therefore, the density and size of the electrical junction box has been increased.
In response to this situation, a power distributor (PD) in which mounting relays such as semiconductor switching elements (FETs) and SMD relays are mounted on a printed circuit board, and a bus bar and a heat sink are mounted on the other side of the printed circuit board. Is incorporated into an electrical junction box.

  For example, in Japanese Patent Application Laid-Open No. 2004-72907 (Patent Document 1), as shown in FIG. 4, a circuit structure 3 in which a printed circuit board having a bus bar fixed to an insulating resin frame 2 is assembled in a vertical direction, and the bus bar is insulated. An electric connection box 1 is provided in which an internal circuit is provided with a fusible link block 4 and a relay block 5 in which a laminated body in which plates are laminated is accommodated in a horizontal direction, and these are assembled in a box 6.

However, since the circuit structure 3, fusible link block 4, and relay block 5 of the electrical junction box 1 are formed by accommodating the internal circuits in separate dedicated cases, a plurality of cases are required and the number of parts is reduced. There are increasing problems.
In addition, since the bus bars of the circuit structure 3, fusible link block 4, and relay block 5 are formed by punching separate conductive metal plates, separate molds are required, which increases the cost. is there.

JP 2004-72907 A

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and reduces the cost by eliminating a dedicated case for the power distributor, reduces the size of the electrical junction box, and fixes the bus bar to the power distributor bus bar and the insulating plate. It is an object to reduce costs by eliminating the need for individual molds for forming each of the above.

In order to solve the above problems, the present invention is a power distributor in which a bus bar is fixed to the surface opposite to the printed conductor side of the printed circuit board, and an insulating plate in which the bus bar is fixed are arranged in parallel in the horizontal direction.
The bus bar solidified on the printed circuit board and the bus bar fixed to the insulating plate are punched from the same conductive metal plate, and are continuously arranged on the same plane,
An electric junction box for an automobile is provided, wherein the power distributor is housed in one common case including an upper case and a lower case together with an insulating plate to which the bus bar is fixed.

The bus bar fixed to the insulating plate is the uppermost bus bar among the bus bar laminated products composed of blocks in which insulating plates and bus bars are alternately stacked, and the bus bar is connected to the power distributor bus bar and one conductive metal. It is provided by punching with a plate and arranged continuously.
The uppermost bus bar and the insulating plate for mounting and fixing the bus bar are arranged in parallel with the printed circuit board of the power distributor in the horizontal direction, but the lower bus bar and insulating board may be arranged below the power distributor. Alternatively, a lower-layer bus bar and an insulating plate may be laminated and disposed below the juxtaposed portion with the power distributor. Further, when the number of circuits is small, it may be constituted by a single insulating plate and a bus bar arranged in parallel with the power distributor.

  According to the configuration of the present invention, the bus bar fixed to the printed circuit board accommodated in the case of the electrical junction box and the bus bar fixed to the insulating plate are arranged on the same plane, so that it is insulated from the bus bar fixed to the printed circuit board. The bus bar fixed to the plate can be punched from one conductive metal plate. This eliminates the need to separately provide molds for punching the printed circuit board and the bus bar fixed to the insulating plate, thereby reducing the cost. In addition, the bus bar of the printed circuit board and the bus bar fixed to the insulating plate can be connected without a relay part by connecting the bus bar at an arbitrary position and processing.

  In addition, the power distributor and the insulating plate to which the bus bar is fixed are arranged in parallel in the horizontal direction, and the bus bar of the power distributor formed from one conductive metal plate and the bus bar to be fixed on the insulating plate are connected in a required circuit. For this reason, the power distributor is not accommodated in the dedicated case, but is accommodated in one common case composed of the upper case and the lower case. As a result, a dedicated case for the power distributor is not required, the number of parts and the number of assembling steps can be reduced, the cost can be reduced, and the electrical junction box can be downsized.

The bus bar fixed to the insulating plate and the bus bar fixed to the printed circuit board are provided with an external connection terminal to be connected to a relay, a fuse, and a connector, and the external connection terminal is a relay mounting portion provided in the upper case or / and the lower case, While the upper cover is attached to the upper case in a region surrounding the relay attachment portion, the fuse attachment portion, and the connector attachment portion, located in the fuse attachment portion and the connector attachment portion,
The relay mounted on the printed circuit board of the power distributor is disposed inside the upper wall of the upper case.

That is, in the placement area of the relay mounted on the printed circuit board, since the mounting relay is accommodated inside the case with the upper wall of the upper case as a closed wall, there is no need to attach an upper cover, but a plug-in relay, fuse, connector An upper cover is put on the area where the is attached.
The lower cover covers the entire area.

  As described above, according to the present invention, the bus bar fixed to the printed circuit board of the power distributor housed inside the case of the electrical junction box and the bus bar laminated product in which the bus bar and the insulating plate are alternately laminated are fixed to the insulating plate. By continuously arranging the uppermost bus bar on the same plane, the bus bar on the power distributor side and the bus bar fixed to the insulating plate can be punched from one conductive metal plate. Thereby, it is not necessary to separately provide molds for punching the bus bar on the power distributor side and the bus bar fixed to the insulating plate, and the mold cost for forming the bus bar can be reduced. In addition, the power distributor was previously housed in a special case and assembled in the electrical junction box. However, without providing the special case, the power distributor is housed in a common case together with other electrical components such as a laminated body of insulating plates and bus bars. Therefore, the manufacturing cost of the dedicated case can be reduced, and the electrical junction box can be downsized.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 to FIG. 3 show an embodiment of the present invention, inside a case constituted by an upper case 11 and a lower case 12 of an electrical junction box 10, on the left side in FIG. 2, a power distributor 100 (hereinafter referred to as PD 100). And the insulating plate 30 to which the bus bar 31 is fixed are arranged in parallel in the horizontal direction on the right side in FIG. The PD 100 is not housed in a dedicated case, and the printed circuit board 20 of the PD 100 is directly disposed inside the upper case 11 and the lower case 12, and the upper case 11 and the lower case 12 are used as a common case for housing the PD 100. .

  In the plan view of FIG. 1, a region S surrounded by an alternate long and short dash line indicates an arrangement region of the PD 100, and in this region S, the upper wall of the upper case 11 is a closed wall, but in FIG. In the L-shaped region, a fuse mounting portion 13, a relay mounting portion 19, a fusible link mounting portion 16, and a connector mounting portion 18 are provided in the upper case 11, and a fuse, a relay (plug-in relay), a connector, etc. are provided in these mounting portions. After fitting, the upper cover 60 is surrounded. On the other hand, the lower cover 61 is fitted and attached under the entire peripheral wall of the upper cover 11.

  A bus bar 21 is fixed to the lower surface of the printed circuit board 20 of the PD 100 horizontally disposed in the upper case 11 and the lower case 12, and a printed conductor (not shown) is provided on the upper surface. The terminals of the board relay 40 and the semiconductor relay 41 are soldered to the printed conductor of the printed circuit board 20 or are penetrated through through holes (not shown) provided in the printed circuit board 20 and soldered to the bus bar 21 to form the board relay. 40, the semiconductor relay 41 is mounted on the printed circuit board 20, and these mounting relays 40 and 41 are disposed below the upper closed wall of the upper case 11.

The bus bar 21 fixed to the lower surface of the printed circuit board 20 is formed by punching with one die from a bus bar 31 fixed to an insulating plate 30 arranged in parallel in the horizontal direction and one conductive metal plate. As shown in FIG. 2, the bus bar 21 fixed to the printed circuit board 20 and the bus bar 31 fixed to the insulating plate 30 are continuously arranged on the same plane. The bus bar 21 and the bus bar 31 are formed by a continuous required circuit.
Below the insulating plate 30, another bus bar 36 and insulating plate 37 are alternately laminated to form a bus bar laminated product 38.
The lower bus bar and the insulating plate may extend downward with a gap from the printed board 20.

As shown in FIG. 3, an upward tab 33 is provided on the bus bar 31 of the bus bar laminated product 38, and the tab 33 is connected to the terminal 42 a of the fuse 42 fitted into the fuse mounting portion 13. On the other hand, the bus bar 21 fixed to the lower surface of the printed circuit board 20 is provided with an upward tab 22 extending toward the fuse mounting portion 13 as shown in FIG. It is connected to the terminal 42b. That is, the fuse 42 is interposed between the required circuit composed of the bus bar 31 of the bus bar laminate 38 and the required circuit composed of the bus bar 21 fixed to the printed circuit board 20. Since the bus bar 31 of the bus bar laminated product 38 and the bus bar 21 fixed to the printed circuit board 20 are connected through the fuse 42 as described above, the bus bars 21 and 31 are connected to one conductive metal. It can be punched from the board.
Although not shown, the tab 33 provided on the bus bar 31 of the bus bar laminate 38 is connected to the terminal 42a of the fuse 42, and the other tab 33 provided on the bus bar 31 is connected to the terminal 42b of the same fuse 42. There is also a circuit in which a fuse 42 is interposed in a required circuit in the bus bar laminated product 38.
Also, as shown in FIG. 3, a tab 23 to be inserted into a connector mounting portion 14 provided in the lower case 12 is provided on the bus bar 21 of the printed circuit board 20 and connected to a connector (not shown).

On the other hand, the bus bar 31 of the bus bar laminated product 38 is provided with a tuning fork-like relay connection terminal 32 as shown in FIG. 2, and the terminal accommodating chamber 19a of the relay mounting portion 19 provided with the relay connection terminal 32 in the upper case 11. And is connected to the plug-in relay 51 by fitting.
The bus bar 31 and the lower bus bar 36 extend to the fusible link mounting portion 16 shown in FIG. 1, the connector mounting portion 18, and the connector mounting portion 17 provided in the lower case 12 shown in FIG. The tabs 34 provided at the mounting portions are positioned at the mounting portions, and are connected to the output terminals 53 and connectors (not shown) of the fusible link 52, respectively. The input terminal 54 of the fusible link 52 is connected to a power supply line via another bus bar (not shown).

  According to the said structure, in order to arrange | position the bus-bar 21 fixed to the printed circuit board 20 of PD100 accommodated in the inside of the case of the electrical junction box 10, and the bus-bar 31 fixed to the insulating board 30 of the bus-bar laminated product 38 on the same plane. These bus bars 21 and 31 can be stamped from one conductive metal plate. Thereby, it is not necessary to separately provide molds for punching the bus bar 21 of the power distributor and the bus bar 31 fixed to the insulating plate 30, and the cost can be reduced.

In addition, the printed circuit board 20 of the PD 100 and the insulating plate 30 of the bus bar laminated product 38 are arranged in parallel in the horizontal direction, and the bus bar 21 and the bus bar 31 are formed of one conductive metal plate and are continuously formed in a required circuit. For this reason, the PD is not accommodated in the dedicated case, but is arranged inside one common case composed of the upper case 11 and the lower case 12.
Thereby, it becomes unnecessary to accommodate the PD 100 in the dedicated case, the number of parts and the number of assembling steps can be reduced, and the electrical connection box can be downsized.
Furthermore, it is not necessary to connect the circuit between the bus bar of the PD punched out from one conductive metal plate and the bus bar fixed to the insulating plate via a relay terminal.

It is a top view of the electrical junction box of the embodiment of the present invention. It is an AA line sectional view of an electric junction box. It is a BB line sectional view of an electric junction box. It is drawing which shows a prior art example.

Explanation of symbols

10 Electrical connection box 11 Upper case 12 Lower case 13 Fuse mounting part 14, 17, 18 Connector mounting part 19 Relay mounting part 20 Printed circuit board 21 Bus bar 22, 33, 34 Tab (external terminal connection part)
30 Insulating plate 31 Bus bar 32 Relay connection terminal 38 Bus bar laminated product 40 Substrate relay 41 Semiconductor relay 51 Plug-in relay 100 Power distributor (PD)
S Power distributor placement area

Claims (2)

A power distributor with a bus bar fixed to the surface opposite to the printed conductor side of the printed circuit board and an insulating plate with the bus bar fixed are arranged in parallel in the horizontal direction.
The bus bar solidified on the printed circuit board and the bus bar fixed to the insulating plate are punched from one conductive metal plate and continuously arranged on the same plane,
An electric junction box for automobiles, wherein the power distributor is housed in one common case including an upper case and a lower case together with an insulating plate to which the bus bar is fixed. From the bus bar fixed to the insulating plate and the bus bar fixed to the printed circuit board, an external connection terminal connected to a relay, a fuse, and a connector is provided, and the external connection terminal is a relay mounting portion provided in the upper case or / and the lower case, While the upper cover is attached to the upper case in a region surrounding the relay attachment portion, the fuse attachment portion, and the connector attachment portion, located in the fuse attachment portion and the connector attachment portion,
The electric junction box for automobiles according to claim 1, wherein the relay mounted on the printed circuit board of the power distributor is disposed inside the closed upper wall of the upper case.

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