JP2012070603A - Circuit structure and electric connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circuit structure 10 where heat generation from a bus bar connected to a fuse is suppressed and to provide an electric connection box 11.SOLUTION: The circuit structure 10 includes: a fuse block 13 which has a surface and a rear face and on which the fuse is installed from the surface; a connector block 14 with which an opposite-side connector is engaged; an electric wire 15 connecting the fuse block 13 and the connector block 14; and an electric wire routing member 17 in which a holding portion 16 holding the electric wire 15 is arranged and the electric wire 15 is routed. One end of a fuse bus bar 18 connected to the fuse is disposed in the fuse block 13, and the other end of the fuse bus bar 18 is connected to a relay mounting substrate 20 on which a first relay 19 is mounted, and the relay mounting substrate 20 is installed along the rear face of the fuse block 13.

Description

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

  Conventionally, the thing of patent document 1 is known as an electrical junction box in which the circuit structure was accommodated in the case. An inner bottom is formed in the box body of the electric junction box. There is a bus bar on the bottom. One end of the bus bar is arranged in the fuse block and connected to the fuse. A relay connection terminal is provided at the other end of the bus bar. This relay connection terminal is accommodated in the relay cavity. A small relay is connected to the relay cavity.

Japanese Patent Laid-Open No. 11-27829

  In the prior art, the relay cavity is located away from the fuse block. For this reason, the wiring path of the bus bar connecting the fuse block and the relay cavity is relatively long. As a result, there is a problem that when the relay is energized, the amount of heat generated from the bus bar connecting the fuse block and the relay cavity increases. This is a particular problem because a relatively large current flows through the fuse.

  This invention is completed based on the above situations, Comprising: It aims at providing the circuit structure body and electrical junction box with which the heat_generation | fever from the bus bar connected to a fuse was suppressed.

  The present invention is a circuit configuration body having a front surface and a back surface, a fuse block to which a fuse is mounted from the front surface side, a connector block to which a mating connector is fitted, the fuse block, and the connector block And an electric wire routing member in which the electric wire is routed and a holding portion for holding the electric wire is provided, and the fuse block has one of fuse bus bars connected to the fuse. And the other end of the fuse bus bar is connected to a relay mounting board on which a first relay is mounted, and the relay mounting board extends along the back surface of the fuse block. Are arranged.

  Moreover, this invention is an electrical junction box which accommodates the said circuit structure in a case.

  According to the present invention, since the relay mounting board is arranged along the back surface of the fuse block, the fuse block and the relay mounting board can be arranged relatively close to each other. Thereby, the length of the bus bar for fuses connecting between the fuse block and the relay mounting board can be made relatively short. As a result, heat generation from the fuse bus bar during energization can be suppressed.

As embodiments of the present invention, the following embodiments are preferable.
A circuit board is arranged opposite to the electric cable arrangement member, and the relay mounting board is substantially perpendicular to the electric cable arrangement member and the circuit board at a side of the electric cable arrangement member and the circuit board. Preferably, the relay mounting board and the circuit board are connected by a relay terminal.

  According to said aspect, the relay mounting board | substrate is distribute | arranged with the attitude | position substantially perpendicular | vertical with respect to the electric wire wiring member and a circuit board in the side of an electric wire wiring member and a circuit board. Thereby, compared with the case where a relay mounting board is arranged in the position of the side of an electric wire arrangement member and a circuit board in parallel to an electric wire arrangement member and a circuit board, a board of an electric wire arrangement member and a circuit board The circuit structure can be downsized in the direction parallel to the surface.

  The lead terminal of the first relay and the bus bar for the fuse are inserted through a through hole formed in the relay mounting board from a surface facing the back surface of the fuse block of the relay mounting board, and the relay It is preferable that flow soldering is performed from the surface opposite to the facing surface of the mounting substrate.

  According to the above aspect, the lead of the first relay and the fuse bus bar can be simultaneously flow soldered, so that the manufacturing process of the circuit structure can be shortened.

  It is preferable that the 2nd relay is arrange | positioned in the space between the said electric wire wiring member and the said circuit board on the surface at the said circuit board side among the said electric wire wiring members.

  According to said aspect, since a 2nd relay is arrange | positioned also in the space between an electric wire wiring member and a circuit board, the wiring density of a circuit structure body can be improved.

  The current value energized in the first relay is preferably larger than the current value energized in the second relay.

  According to the above aspect, a larger current flows in the first relay than in the second relay. As a result, the amount of heat generated from the fuse bus bar connecting the fuse and the first relay becomes relatively large. The present invention is particularly effective because heat generation from the fuse bus bar can be suppressed when the value of the current supplied to the first relay is relatively large.

  According to the present invention, heat generation from the fuse bus bar can be suppressed.

The front view which shows the electrical junction box which concerns on one Embodiment of this invention The top view which shows the circuit structure based on one Embodiment of this invention. Rear view showing the circuit structure Rear view showing relay mounting board Side view showing relay mounting board Plan view showing relay mounting board Rear view showing the state where the relay mounting board is arranged on the fuse block Side view showing the state where the relay mounting board is arranged on the fuse block A plan view showing a state in which a relay mounting board is arranged on a fuse block The perspective view which shows the state which connected the electric power bus bar and the control bus bar to the 2nd relay. Front view showing a state where the power bus bar and the control bus bar are connected to the second relay. Cutaway side view of the main part showing a state in which the second relay is disposed on the wire routing member

  An embodiment in which a circuit structure 10 according to the present invention is applied to an in-vehicle electrical junction box 11 will be described with reference to FIGS. The electrical junction box 11 according to the present embodiment includes a circuit structure 10 housed in a case 12 made of synthetic resin. The electrical junction box 11 is disposed between a power source (not shown) and in-vehicle electrical components (not shown) such as a wiper and a light, and executes on / off of power from the power source for the in-vehicle electrical components. To do. In the following description, the upper side in FIG. 1 is the upper side, and the lower side is the lower side. Further, the description will be made assuming that the lower part in FIG. 2 is the front and the upper part is the rear.

  The circuit component 10 includes a synthetic resin fuse block 13 to which a fuse (not shown) is attached, and a counterpart connector (not shown) connected to an in-vehicle electrical component or a power source via a wire harness (not shown). A synthetic resin connector block 14 to be fitted, an electric wire 15 for connecting the fuse block 13 and the connector block 14, and a holding portion 16 for holding the electric wire 15 are provided, and the electric resin 15 is routed. And an electric wire routing member 17 made of.

  The fuse block 13 has a flat block shape in the front-rear direction (left-right direction in FIG. 1, up-down direction in FIG. 2). The front surface of the fuse block 13 is a front surface 13A, and the rear surface is a back surface 13B. The fuse is mounted from the surface 13A side of the fuse block 13 in a fuse mounting portion (not shown).

  A fuse bus bar 18 is disposed on the back surface 13 </ b> B of the fuse block 13. The fuse bus bar 18 is formed by pressing a metal plate into a predetermined shape. One end of the fuse bus bar 18 is assembled to the fuse block 13 and disposed in the fuse mounting portion. The fuse bus bar 18 is electrically connected to the fuse mounted in the fuse mounting portion. One end portion of the fuse bus bar 18 is divided into two portions so that a fuse lead terminal (not shown) can be clamped. The other end of the fuse bus bar 18 protrudes rearward from the rear surface 13B of the fuse block 13.

  As shown in FIG. 9, a relay mounting board 20 on which the first relay 19 is mounted is disposed behind the fuse block 13 along the back surface 13 </ b> B of the fuse block 13. The relay mounting board 20 is arranged to face the back surface 13B of the fuse block 13 with a gap. As shown in FIG. 7, the relay mounting substrate 20 has a rectangular shape. Conductive paths (not shown) are formed on the front and back surfaces of the relay mounting board 20 by a printed wiring technique.

  A plurality of through holes 21 </ b> A are formed in the relay mounting substrate 20. The other end of the fuse bus bar 18 is inserted into the through hole 21 </ b> A from the facing surface 22 side facing the back surface 13 </ b> B of the fuse block 13 in the relay mounting board 20. The other end of the fuse bus bar 18 is flow soldered from the surface of the relay mounting board 20 opposite to the facing surface 22.

  As shown in FIG. 4, a plurality (five in this embodiment) of first relays 19 are mounted on the facing surface 22 of the relay mounting substrate 20. The first relays 19 are arranged side by side on the relay mounting board 20 at positions closer to the top. As shown in FIG. 5, the lead terminal 19 </ b> A of the first relay 19 is inserted into the through hole 21 </ b> A formed in the relay mounting substrate 20 from the facing surface 22 side (left side in FIG. 5). The lead terminal 19 </ b> A of the first relay 19 is flow soldered from the surface opposite to the facing surface 22 of the relay mounting substrate 20. Further, an electronic component 23 </ b> A such as a resistor is mounted on the facing surface 22 of the relay mounting substrate 20.

  Of the fuse bus bar 18, the fuse bus bar 18 </ b> A connected to the power terminal (both input terminal and / or output terminal) of the first relay 19 is led out from the back surface 13 </ b> B of the fuse block 13 and then cranked. It is bent and connected to the relay mounting board 20 while avoiding interference with the first relay 19.

  The relay mounting board 20 is provided with a linear fuse bus bar 18B in the vicinity of the center in the vertical direction (vertical direction in FIG. 5). These fuse bus bars 18B are arranged in two stages in the vertical direction and arranged side by side. Below the fuse bus bars 18B, fuse bus bars 18C bent into a crank shape are arranged side by side.

  As shown in FIG. 5, at the position near the lower end portion of the relay mounting substrate 20, relay terminals 25 having an L shape when viewed from the side are arranged in two stages in the vertical direction and are arranged side by side. . The relay terminal 25 is disposed so as to penetrate through a synthetic resin pedestal 26 disposed on the facing surface 22 of the relay mounting substrate 20. The pedestal 26 has a substantially rectangular parallelepiped shape. One end of the relay terminal 25 is inserted into the through hole 21 </ b> A from the facing surface 22 side of the relay mounting substrate 20 and is flow soldered from the opposite side of the facing surface 22. The other end of the relay terminal 25 is bent at a right angle downward, inserted into a through hole 21B formed in the circuit board 27 described later, and flow soldered to the circuit board 27 from below. ing.

  The electric wire routing member 17 has a generally plate shape and is arranged in a posture substantially perpendicular to the back surface 13B of the fuse block 13. A plurality of holding portions 16 are formed on the upper surface of the wire routing member 17 so as to protrude upward. The holding part 16 is divided into two forks and can hold the electric wire 15. The electric wire 15 is formed by coating the outer surface of a single core wire (not shown) with an insulating coating (not shown).

  As shown in FIG. 12, the electric wire routing member 17 is provided with a power bus bar 29 having a press contact blade 28 to which the electric wire 15 is pressed. The power bus bar 29 is press-fitted or insert-molded with respect to the electric wire routing member 17. As described above, the end portion of the power bus bar 29 is formed with a press-contact blade 28 that protrudes upward and has a forked portion that can press-contact the electric wire 15. The press contact blade 28 is housed inside the holding portion 16 of the electric wire routing member 17. When the electric wire 15 is inserted into the holding portion 16, the press contact blade 28 cuts out the insulation coating, and the single core wire exposed from the insulation coating and the press contact blade 28 come into contact with each other, whereby the electric wire 15 and the power bus bar 29. Are electrically connected.

  As shown in FIG. 12, the power bus bar 29 is reflow soldered to the lead terminal 30 </ b> A of the second relay 30. Specifically, the lead terminals 30A and 30A corresponding to the input terminal and the output terminal of the second relay 30 are connected to the power bus bar 29, respectively.

  On the other hand, the coil terminal 30B of the second relay 30 is reflow soldered to the control bus bar 31. The control bus bar 31 is connected to the coil terminal 30 </ b> B of the second relay 30, extends to the side of the second relay 30, and then bent downward at a substantially right angle.

  A circuit board 27 is disposed below the wire routing member 17 so as to face the wire routing member 17. The circuit board 27 is arranged substantially parallel to the upper and lower sides at a distance from the wire routing member 17. Conductive paths (not shown) are formed on the upper and lower surfaces of the circuit board 27 by a printed wiring technique. On the upper surface of the circuit board 27, electronic components 23B such as a semiconductor relay and a microcomputer are mounted. A third relay 32 is mounted on the upper surface of the circuit board 27. Note that the relay mounting board 20 described above is disposed in a substantially vertical posture with respect to both the wire routing member 17 and the circuit board 27 at a position on the side of the wire routing member 17 and the circuit board 27.

  A through-hole 21B is formed in the circuit board 27. The through hole 21B is flow soldered to the conductive path of the circuit board 27 with the tip of the control bus bar 31 inserted therein.

  As shown in FIG. 3, the second relay 30 is disposed in the space between the electric wire routing member 17 and the circuit board 27. The second relay 30 is disposed above the third relay 32. That is, the second relay 30 and the third relay 32 are arranged side by side in the vertical direction.

  The power bus bar 29 described above is disposed so as to be exposed on the surface (lower surface) on the circuit board 27 side of the wire routing member 17, and the lead terminal 30 </ b> A of the second relay 30 is disposed on the lower surface of the power bus bar 29. Is connected. Note that the current value energized in the first relay 19 is set to be larger than the current value energized in the second relay 30.

  A plurality (two in this embodiment) of connector blocks 14 are attached to the peripheral edge of the circuit board 27. The connector block 14 is formed with a hood portion 14A that can be mated with a mating connector (not shown), and a terminal fitting 33 is disposed inside the hood portion 14A. The terminal fitting 33 is bent upward or downward through the hood portion 14A. The terminal fitting 33 bent downward is inserted into a through-hole 21 </ b> B formed in the circuit board 27 and is flow soldered to the conductive path of the circuit board 27. The terminal fitting 33 that is bent upward is disposed on the connector wiring board 34.

  The connector wiring board 34 is made of a synthetic resin material. A holding portion 35 protrudes from the upper surface of the connector wiring board 34. The holding portion 35 is formed by being divided into two forks so that the electric wire 15 can be clamped. Inside the holding portion 35, an end portion of the terminal fitting 33 arranged on the connector wiring plate 34 is accommodated. At the end of the terminal fitting 33 accommodated in the holding part 35, a press contact blade 36 that is divided into two forks and can hold the electric wire 15 is formed. When the electric wire 15 is inserted into the holding portion 35, the press contact blade 36 cuts out the insulation coating, and the single core wire exposed from the insulation coating and the press contact blade 36 come into contact with each other. Are electrically connected.

  Further, on the rear surface 13B of the fuse block 13, a fuse wiring board 37 made of synthetic resin is disposed at a position near the upper end so as to face the rear surface 13B of the fuse block 13. A holding portion 38 is formed to protrude from the back surface of the fuse wiring board 37. The holding portion 38 is divided into two forks and can hold the electric wire 15. The other end portion of the fuse bus bar 18 is accommodated in the holding portion 38. At the end of the fuse bus bar 18 accommodated in the holding portion 38, a press contact blade 39 that is divided into two forks and can hold the electric wire 15 is formed. When the electric wire 15 is inserted into the holding portion 38, the press contact blade 39 cuts out the insulation coating, and the single core wire exposed from the insulation coating and the press contact blade 39 come into contact with each other, whereby the electric wire 15 and the fuse bus bar 18. Are electrically connected.

  Then, the effect | action and effect of this embodiment are demonstrated. According to this embodiment, since the relay mounting board 20 is arranged along the back surface 13B of the fuse block 13, the fuse block 13 and the relay mounting board 20 can be arranged relatively close to each other. . As a result, the length of the fuse bus bar 18 connecting the fuse block 13 and the relay mounting board 20 can be made relatively short. As a result, heat generation from the fuse bus bar 18 during energization can be suppressed.

  In addition, according to the present embodiment, the circuit board 27 is arranged to face the electric cable arrangement member 17, and the relay mounting board 20 is arranged on the side of the electric cable arrangement member 17 and the circuit board 27. The relay mounting board 20 and the circuit board 27 are connected to each other by a relay terminal 25. As a result, the relay mounting board 20 is arranged in a substantially vertical posture with respect to the wire routing member 17 and the circuit board 27 on the side of the wire routing member 17 and the circuit board 27. Thereby, compared with the case where the relay mounting board | substrate 20 is arrange | positioned in parallel with respect to the electric wire wiring member 17 and the circuit board 27 in the position of the side of the electric wire wiring member 17 and the circuit board 27, an electric wire wiring member. The circuit structure 10 can be downsized in the direction parallel to the plate surfaces of the circuit board 17 and the circuit board 27.

  Further, according to the present embodiment, the lead terminal 19 </ b> A of the first relay 19 and the fuse bus bar 18 are formed on the relay mounting substrate 20 from the facing surface 22 facing the back surface 13 </ b> B of the fuse block 13 in the relay mounting substrate 20. The relay mounting board 20 is flow soldered from the surface opposite to the facing surface 22. According to the above configuration, since the lead terminal 19A of the first relay 19 and the fuse bus bar 18 can be simultaneously flow soldered from the surface opposite to the facing surface 22 of the relay mounting board 20, the circuit component 10 manufacturing processes can be shortened.

  Further, according to the present embodiment, the second relay 30 is disposed in the space between the wire routing member 17 and the circuit board 27 on the surface of the wire routing member 17 on the circuit board 27 side. . Thereby, since the 2nd relay 30 is arrange | positioned also in the space between the electric wire wiring member 17 and the circuit board 27, the wiring density of the circuit structure 10 can be improved.

  Further, according to the present embodiment, a current larger than that of the second relay 30 flows through the first relay 19. As a result, the amount of heat generated from the fuse bus bar 18 connecting the fuse and the first relay 19 becomes relatively large. The present invention is particularly effective because the heat generation from the fuse bus bar 18 can be suppressed when the current value supplied to the first relay 19 is relatively large.

<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) In the present embodiment, the electric wire routing member 17 is configured to be provided with the second relay 30, but the second relay 30 may be omitted as necessary. Further, the third relay 32 can be omitted if necessary.
(2) In the present embodiment, the lead terminal 19A of the first relay 19 is configured to be flow soldered to the relay mounting board 20, but the present invention is not limited to this, and the lead terminal 19A of the first relay 19 is the relay mounting board. It is good also as a structure reflow-soldered to the land formed in the surface of 20. FIG.
(3) In the present embodiment, the first relay 19 and the fuse bus bar 18 are configured to be inserted into the through hole 21 from the surface of the relay mounting substrate 20 facing the fuse block 13, but the present invention is not limited thereto. Instead, the first relay 19 and the fuse bus bar 18 may be inserted into the through hole 21 from different surfaces of the relay mounting board 20 and connected to the conductive path of the relay mounting board 20.
(4) In this embodiment, the relay mounting board 20 is arranged vertically with respect to the wire routing member 17 and the circuit board 27. However, the present invention is not limited to this, and the relay mounting board 20 is not limited to the wire routing board. The wiring member 17 and the circuit board 27 may be arranged parallel to each other, or may be stacked with an interval from the wire wiring member 17 and the circuit board 27, and arranged at an arbitrary position as necessary. Can be set.
(5) In the present embodiment, the five first relays 19 are mounted on the relay mounting board 20. However, the present invention is not limited to this, and one or two to four relay mounting boards 20 are provided. Or it is good also as a structure by which the 6 or more 1st relay 19 is mounted.
(6) In the present embodiment, the second relay 30 is disposed on the lower surface of the wire routing member 17. However, the present invention is not limited to this, and the second relay 30 is disposed on the upper surface of the wire routing member 17. It may be configured to be provided.
(7) In this embodiment, although the electric wire 15 was routed on the upper surface of the electric wire routing member 17, the present invention is not limited to this, and the electric wire 15 is routed on the lower surface of the electric wire routing member 17. In addition, it may be configured to be routed on both the upper surface and the lower surface.
(8) Although the electrical junction box according to the present embodiment has been described with reference to the vertical direction in FIG. 1, the electrical junction box according to the present embodiment is arranged in a posture with the fuse block 14 facing downward, for example. It can be arranged in any posture as necessary.

DESCRIPTION OF SYMBOLS 10 ... Circuit structure 11 ... Electrical junction box 12 ... Case 13 ... Fuse block 14 ... Connector block 15 ... Electric wire 16 ... Holding part 17 ... Electric wire routing member 18 ... Bus bar for fuses 19 ... 1st relay 19A ... Lead terminal 20 ... Relay mounting board 21 ... through hole 22 ... opposite surface 27 ... circuit board 25 ... relay terminal 30 ... second relay

Claims (6)

A fuse block having a front surface and a back surface, to which a fuse is mounted from the front surface side, a connector block to which a mating connector is fitted, an electric wire connecting the fuse block and the connector block, and holding the electric wire A holding part to be provided and an electric wire routing member in which the electric wire is routed,
One end of a fuse bus bar connected to the fuse is disposed in the fuse block, and the other end of the fuse bus bar is connected to a relay mounting board on which a first relay is mounted. And
The relay mounting board is a circuit configuration body arranged along the back surface of the fuse block. A circuit board is arranged opposite to the electric cable arrangement member, and the relay mounting board is substantially perpendicular to the electric cable arrangement member and the circuit board at a side of the electric cable arrangement member and the circuit board. The circuit structure according to claim 1, wherein the circuit mounting body is arranged in a posture, and the relay mounting board and the circuit board are connected by a relay terminal. The lead terminal of the first relay and the bus bar for the fuse are inserted through a through hole formed in the relay mounting board from a surface facing the back surface of the fuse block of the relay mounting board, and the relay The circuit structure according to claim 1, wherein the circuit board is flow soldered from a surface opposite to the facing surface of the mounting substrate. 4. The second relay according to claim 2, wherein a second relay is disposed in a space between the electric wire arrangement member and the circuit board on the surface of the electric wire arrangement member on the circuit board side. 5. Circuit construct. The circuit configuration body according to claim 4, wherein a current value energized in the first relay is larger than a current value energized in the second relay. An electrical junction box comprising: the circuit structure according to any one of claims 1 to 5; and a case for housing the circuit structure.

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