JP5633725B2 - Circuit structure and electrical junction box - Google Patents

Description

  The present invention relates to a circuit structure and an electrical junction box.

  A metal bus bar is used as a conductive path in the circuit structure and electrical connection box provided in the path for distributing power supplied from the power source to the load, but when the load current increases, the area of the bus bar increases. There was a problem of increasing the size.

  On the other hand, it is conceivable to reduce the size by increasing the bus bar thickness to reduce the area, but the manufacturing cost increases, and a large current is passed through the inside, so that heat generation increases and heat dissipation efficiency deteriorates. There is a problem.

  Therefore, as shown in Patent Document 1, a method of using an electric wire routed in a wiring module for connection between a terminal of a connector block and a terminal of a power block, which conventionally used a bus bar, has been considered. In this method, since the electric wire having the covering insulation can be arranged three-dimensionally, it is expected to reduce the size and improve the workability.

JP 2005-51878 A

  By the way, in the structure of patent document 1, when connecting the electric wire to another connector block, since a height position differs from the above-mentioned connector block, an electric wire cannot be directly connected to the terminal of a connector block, and an electric wire A bus bar is used for the connection between the terminal and the terminal. The bus bar has one end connected to the terminal of the connector block and the other end, and the other end is bent upward, and a press contact terminal provided at the tip of the bus bar is connected to the electric wire to be connected to the electric wire.

  However, when connecting to the electric wire through the bus bar in this way, it is necessary to bend the bus bar in order to change the height position thereof, so that the bus bar shape and arrangement are restricted, and the circuit structure and the electrical junction box May be an obstacle to downsizing.

  This invention is completed based on the above situations, Comprising: It aims at size reduction of a circuit structure body and an electrical junction box.

A conductive path according to the present invention, a circuit board having a through hole connected to the conductive path, a wire holding member having a wire holding part for holding an electric wire and arranged to face the circuit board, and one end of the circuit board A relay terminal that connects the electric wire of the wire routing member and the conductive path of the circuit board by being inserted into the through hole of the circuit board, and a tip of the relay terminal provided on the circuit board to the through hole And a guide portion for guiding, wherein the wire routing member has a predetermined distance from the circuit board when the wire routing member is assembled to the circuit board. have a plurality of struts to hold said plurality of struts are provided on the edges and the middle portion of the surface of the circuit board side of the wire routing element (unit 1).

According to the configuration of the means 1, since the electric wire of the electric cable routing member and the conductive path of the circuit board are connected by the relay terminal, the electric connection can be made without using a bent bus bar in the circuit configuration body. Can be ensured, and the circuit structure can be reduced in size.
Here, when attaching the electric wire routing member to the circuit board, there is a possibility that the alignment accuracy is not uniform in the step of inserting the tip end portion of the relay terminal into the through hole, resulting in poor insertion. However, according to the means 1, since the guide portion for guiding the tip of the relay terminal is provided, the tip of the relay terminal can be easily inserted into the through hole. Therefore, the workability of attaching the wire routing member to the circuit board can be improved.

In addition to the configuration of the means 1, the relay terminal is a press contact terminal having an insertion portion inserted into the through hole of the circuit board at one end and a press contact blade pressed against the electric wire at the other end. (Means 2).
If it is made the structure of the means 2, the structure of a relay terminal can be simplified.

In addition to the configuration of the means 1 or 2, the guide portion may be provided with a visual recognition hole for visually recognizing the inside (means 3).
According to the structure of the means 3, it can test | inspect whether the soldering of the relay terminal inserted in the through hole is performed appropriately by visually recognizing an inside from a visual recognition hole.

  An electric junction box comprising the circuit structure according to any one of means 1 to means 3 and a case in which the circuit structure is accommodated (means 4).

  According to the present invention, the circuit structure and the electrical junction box can be reduced in size.

The top view showing the circuit composition object concerning Embodiment 1. Front view showing the circuit structure AA sectional view showing a circuit structure Left side view showing the circuit structure BB sectional view showing circuit structure Plan view showing a circuit board Perspective view showing guide part Front view showing the state before assembling the wiring board to the circuit board AA sectional view showing the state before the assembly of the electric cable wiring board to the circuit board Left side view showing the state before the wiring board is assembled to the circuit board BB sectional view showing the state before assembly of the electric cable wiring board to the circuit board

<Embodiment 1>
Embodiment 1 of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the circuit structure 10 according to the first exemplary embodiment is connected between a power source such as a battery and in-vehicle electrical components such as a headlamp and a wiper as an electrical connection box 50 housed in the case 12. Thus, power supply to various on-vehicle electrical components, control of supplied power, and the like are performed. Hereinafter, the vertical direction will be described with reference to FIG. 4, with the right side of FIG. 4 being the front and the left side being the rear.

As shown in FIG. 4, the circuit component 10 includes a circuit board 20 on which the electronic component 11 is mounted, and an electric wire routing board 30 (on which the electric wire W is routed, arranged opposite to the upper side of the circuit board 20. An example of a “wire routing member” that is a configuration of the present invention, and is arranged between the circuit board 20 and the wire routing board 30, and connects the conductive path of the circuit board 20 and the electric wire W of the wire routing board 30. And a relay terminal 40.
As the electric wire W, a covered electric wire in which a single core wire is covered with an insulating coating is used.

As shown in FIG. 6, the circuit board 20 has a rectangular shape, and has a plurality of printed wiring paths, a large number of through holes 21 that penetrate the circuit board 20, and a tip when the relay terminal 40 is inserted. And a guide unit 24 for guiding.
The through hole 21 has a terminal insertion hole 22 through which a large number of terminals of the fuse block 29A and the connector block 29B are inserted, and a relay insertion hole 23 through which the relay terminal 40 is inserted and positioned below the guide portion 24 (see FIG. 9). With.
The terminal insertion holes 22 are circular through holes, and are formed in a large number at positions near the peripheral edge of the circuit board 20.

  A large number of relay insertion holes 23 are provided in the region of the circuit board 20 where the electric cable routing plates 30 are overlapped, and are connected to the corresponding conductive paths, so that the leading end of the relay terminal 40 can be inserted. It is a circular through-hole having a size.

As shown in FIG. 7, the guide portion 24 is made of metal and has a cylindrical shape having an insertion hole 25 through which the relay terminal 40 is inserted. The insertion hole 25 and the relay insertion hole 23 are concentrically communicated with each other. In addition, it is attached to the upper surface of the circuit board 20.
Specifically, the guide portion 24 has a large opening at the upper end of the insertion hole 25, and from the lower end of the guiding portion 26 and a guiding portion 26 in which the hole diameter decreases in a tapered shape (conical shape) downward from there. The insertion portion 27 has a constant diameter that allows the tip of the relay terminal 40 to be inserted. The insertion portion 27 is formed up to about 2/3 of the height of the guide portion 24, and the diameter of the insertion portion 27 is substantially the same as the diameter of the relay insertion hole 23.

  A viewing hole 28 that penetrates the guide portion 24 in the radial direction is formed in a portion of the guide portion 24 having the insertion portion 27. The visual recognition hole 28 has a circular shape with a constant diameter, and is opened so as to pass through the axis of the guide portion 24, whereby the visual recognition hole 28 communicates with the internal insertion hole 25.

  And this guide part 24 orient | assigns the guidance part 26 upward, and the visual recognition hole 28 is distribute | arranged to the direction (angle) which can be visually recognized from the side (gap between the circuit board 20 and the electric wire wiring board 30). The relay insertion hole 23 on the upper surface of the circuit board 20 in such a direction (so that the visual recognition hole 28 faces in the left-right direction in this embodiment) and the relay insertion hole 23 and the insertion hole 25 of the guide portion 24 are continuous. It is bonded to the peripheral part of the film using an adhesive or the like. In addition, it is also possible to attach the guide part 24 to the circuit board 20 by solder reflow mounting without using an adhesive or the like.

Further, as shown in FIG. 1, a large number of electronic components 11 such as switching elements (FETs, etc.) are mounted on the upper surface of the circuit board 20, and the terminals of the electronic components 11 are connected to corresponding conductive paths. ing.
A fuse block 29A and a connector block 29B are attached to the peripheral edge of the circuit board 20, as indicated by broken lines in FIG.
The connector block 29B includes a plurality of connector portions arranged side by side, and each connector portion has a hood-like connector housing and a connector terminal that penetrates the back wall portion of the connector housing. One end side of the connector terminal is inserted into the terminal insertion hole 22 of the circuit board 20.
A plurality of attachment holes 29 </ b> D for attaching to the case 12 are provided on the peripheral edge of the circuit board 20.

  A power supply terminal 29C protrudes from the rear end of the circuit board 20. The power terminal 29 </ b> C overlaps the circuit board 20 and extends forward, and is connected to the power terminal portion 38 that extends from the wire wiring board 30.

The electric wire routing board 30 is made of synthetic resin (for example, PBT), and as shown in FIG. 4, a flat plate portion 31 on which the electric wires W are arranged, and a number of electric wire holding protrusions that hold the electric wires W. A portion 32 (an example of an “electric wire holding portion” that is a configuration of the present invention) and a support column portion 37 that holds the circuit board 20 at a predetermined distance.
Each electric wire holding convex part 32 protrudes on the upper surface of the flat plate part 31, and the pressure contact blades 42 such as the relay terminals 40 are accommodated therein, and as shown in FIG. A press-contacting recess 34 is provided in the inner side of the pair of upright walls 33.

The press-contact concave portion 34 is provided inside the pair of standing walls 33, is formed in a groove shape from the upper portion of the standing wall 33 to the base end portion, and further extends downward to penetrate the flat plate portion 31. It has become.
In this press contact recess 34, a relay terminal press-fitting hole (see FIG. 11) into which the relay terminal 40 is press-fitted from below and a shape different from the relay terminal press-in inlet, although not shown, There is a connection terminal press-fitting hole into which a connection terminal (not shown) connected to an electronic component (such as a relay switch) on the side is press-fitted from below.
The connection terminal is a terminal part bent at one end side so as to be along the back surface of the wire wiring board 30, the other end side has a press contact blade similar to the press contact blade 42, and the terminal part is soldered to a terminal of the electronic component 36. The other end side is press-fitted into the press-contact recess 34 by attaching or the like.
In addition, as shown in FIG. 1, the electric wire holding convex part 32 is arrange | positioned in the left-right direction at several places in the front-back direction.

  As shown in FIG. 2, the support column 37 is provided in plural on the edge and the middle of the back surface of the electric cable routing board 30, and the assembly of the electric cable routing board 30 to the circuit board 20 is provided. At the time of attachment, the distance between the electric cable routing board 30 and the circuit board 20 is set to a length and strength (thickness) that can be set to a predetermined dimension. The column portion 37 is integrated with the flat plate portion 31 and is formed integrally with the flat plate portion 31 and the electric wire holding convex portion 32.

As shown in FIG. 3, the relay terminal 40 has an insertion portion 41 that is inserted into the through hole 21 of the circuit board 20 at one end, and has a thin plate shape on the upper side. On the upper end side, there is a press contact terminal provided with a press contact blade 42 pressed against the electric wire W.
The insertion portion 41 is a portion that is inserted into the insertion hole 25 of the guide portion 24 and the relay insertion hole 23 of the circuit board 20 and soldered, and is thereby electrically connected to the conductive path of the circuit board 20.

The press contact blade 42 is accommodated in the press contact recess 34 and has a bifurcated shape. When the electric wire W is inserted between the press contact blades 42, the press contact blade 42 cuts the insulating coating portion. And it contacts the core wire inside the electric wire W and is electrically connected to the core wire.
The relay terminal 40 is assembled to the wire wiring board 30 by pressing the relay terminal 40 into the press-contact recess 34 of the wire wiring board 30 from below, but the relay terminal 40 is inserted into the mold in advance. It is also possible to use insert molding in which the resin is poured and then hardened.

  From the rear end portion of the wire wiring board 30, a power terminal portion 38 extending to a predetermined electric wire W is extended, bent downward at the rear of the wire wiring board 30, and extended to the circuit board 20. The power supply terminal 29C of the circuit board 20 is connected.

Next, a method for assembling the circuit structure 10 will be described.
After the fuse block 29A and the connector block 29B are attached to the circuit board 20, as shown in FIG. 9, the circuit board 20 and the electric cable routing board 30 are opposed to each other, and the leading end of the relay terminal 40 is connected to each guide of the circuit board 20. When the circuit board 20 and the electric cable routing board 30 are brought close to each other in accordance with the position of the portion 24, the insertion portion 41 of the relay terminal 40 is inserted into the insertion hole 25 of the guide portion 24. At this time, even if the axial center of the relay terminal 40 is slightly deviated from the axial center of the insertion hole 25 (even if the position of the insertion portion 41 is shifted from the axial center), the insertion portion 41 of the relay terminal 40 is inserted. Is guided by the guide part 26 of the guide part 24, and the position of the relay terminal 40 (position of the insertion part 41) is aligned with the axial center of the insertion part 27 and the relay insertion hole 23 (through hole 21).
And the electric wire W is press-contacted to the press-contacting blade 42 of the relay terminal 40 on the electric wire wiring board 30.

Next, flow soldering is performed so that the lower surface side of the circuit board 20 is immersed in the surface layer of the solder melted in the solder bath, and the relay terminals 40 and the terminals of the fuse block 29A and the connector block 29B are connected to the conductive paths of the circuit board 20. To do.
Thereby, the electric wire W on the electric cable wiring board 30 is electrically connected with the terminal of the corresponding connector block 29B, and the assembly | attachment of the circuit structure 10 is completed.

Then, by visually recognizing the inside (solder) from the visual recognition hole 28 of the guide portion 24, it is inspected whether the relay terminal 40 inserted through the relay insertion hole 23 (through hole 21) is properly soldered. To do. If the soldering is properly performed, the circuit structure 10 is accommodated in the case 12 to form the electrical connection box 50 (see FIG. 1).
In addition, after attaching the electric wire wiring board 30 to the circuit board 20, after wiring the electric wire W to the electric wire wiring board 30 previously (pressure contact to the relay terminal 40 of the electric wire W), it does not wire. Alternatively, the electric cable routing board 30 and the circuit board 20 may be arranged opposite to each other and assembled.

According to this embodiment, the following effects can be obtained.
(1) Since the wire W of the wire routing board 30 (wire routing member) and the conductive path of the circuit board 20 are connected by the relay terminal 40, the bus bar bent or the like in the circuit component 10 is provided. Electrical connection can be ensured without use, and the circuit structure 10 can be downsized.
Here, when the electric cable routing board 30 is attached to the circuit board 20, the alignment accuracy is not uniform in the process of inserting the insertion portion 41 (tip portion) of the relay terminal 40 into the relay insertion hole 23 (through hole 21). There is a possibility that an insertion failure may occur. However, according to this embodiment, since the guide portion 24 guides the insertion portion 41 of the relay terminal 40, the insertion portion 41 of the relay terminal 40 can be easily inserted into the relay insertion hole 23. Therefore, the workability of attaching the electric cable routing board 30 to the circuit board 20 can be improved.

(2) The relay terminal 40 is a press contact terminal having an insertion portion 41 inserted into the relay insertion hole 23 of the circuit board 20 at one end and a press contact blade 42 pressed against the electric wire at the other end. The configuration can be simplified.

(3) Since the guide portion 24 is provided with a visual recognition hole 28 for visually recognizing the inside, by visually recognizing the inside from the visual recognition hole 28, the relay terminal 40 inserted into the relay insertion hole 23 can be soldered. It can be checked for proper operation.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) Although the guide portion 24 is made of metal, it is not limited to this, and may be made of synthetic resin, for example. For example, the guide portion may be attached to the circuit board 20 by solder reflow mounting. Moreover, although the guide part 24 was attached to the surface of the circuit board 20, it is not restricted to this, You may shape | mold integrally with the circuit board 20.

  (2) The relay terminal 40 is configured to be in pressure contact with the electric wire W by the press contact blade 42, but is not limited thereto, and may be press contact other than the press contact blade 42, or a connection method other than the press contact, for example, It may be connected by soldering or pressure bonding.

  (3) The direction of the circuit structure 10 (electrical connection box 50) is not limited to the structure in which the circuit structure 10 (electrical connection box 50) is placed horizontally (arrangement in which the surface of the circuit board 20 is horizontal) as in the above embodiment. The connection box 50) may be arranged vertically (arrangement in which the surface of the circuit board 20 is vertical).

  (4) The insertion hole 25 of the guide part 24 is provided with the guiding part 26 and the insertion part 27, but the insertion part 27 may not be provided. In this case, for example, the diameter of the insertion hole at the lower end of the guiding portion that is reduced in taper is set to the same size as the diameter of the relay insertion hole 23 so that the relay terminal 40 is guided to the relay insertion hole 23. .

DESCRIPTION OF SYMBOLS 10 ... Circuit structure 11 ... Electronic component 12 ... Case 20 ... Circuit board 21 ... Through hole 23 ... Relay insertion hole 24 ... Guide part 25 ... Insertion hole 26 ... Lead-in part 27 ... Insertion part 28 ... Visual hole 30 ... Electric wire wiring Board (electric wire routing member)
32 ... Electric wire holding convex part (electric wire holding part)
33 ... Standing wall 34 ... Concave portion for pressure welding 40 ... Relay terminal 41 ... Insertion portion 42 ... Pressure welding blade 50 ... Electrical junction box W ... Electric wire

Claims (4)

A circuit board having a conductive path and a through hole connected to the conductive path;
An electric wire routing member having an electric wire holding part for holding an electric wire and arranged to face the circuit board;
One end is inserted through the through hole of the circuit board to connect the electric wire of the electric wire routing member and the conductive path of the circuit board,
A guide portion provided on the circuit board for guiding the tip of the relay terminal to the through hole;
The wire routing member have a plurality of struts to hold a distance between the circuit board during assembly to the circuit board of the wire routing element to a predetermined distance,
The plurality of support columns are circuit components provided on an edge and an intermediate portion of the surface of the electric wire routing member on the circuit board side . 2. The circuit according to claim 1, wherein the relay terminal is a press contact terminal having an insertion portion inserted into a through hole of the circuit board at one end and a press contact blade pressed against the electric wire at the other end. Construct. The circuit structure according to claim 1, wherein the guide portion is provided with a visual recognition hole for visually recognizing the inside. An electrical junction box comprising the circuit structure according to any one of claims 1 to 3 and a case in which the circuit structure is accommodated.

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