JP6630489B2 - Electronic component unit and wire harness - Google Patents

Description

  The present invention relates to an electronic component unit and a wire harness.

  2. Description of the Related Art A vehicle such as an automobile is equipped with an electronic component unit for energizing and disconnecting (so-called, on / off) various electronic devices to be mounted. This type of electronic component unit may use, for example, a circuit board on which electronic components are mounted, a case for housing the circuit board, an external connection portion exposed outside the case, and solder or the like housed in the case for the circuit board. And a conductive bus bar having a board connection portion fixed by attachment. In this type of electronic component unit, a terminal fitting or the like attached to an end of an electric wire is fixed to an external connection portion with a bolt.

JP 2005-19434 A JP-A-11-346418 JP-A-10-336850 JP-A-2002-374607 JP 2006-325356 A JP-A-2012-235693

  Incidentally, in the above-described electronic component unit, when a terminal fitting or the like is fixed to the external connection portion of the bus bar, an external force from a bolt or the like may act on the bus bar. In this case, there is a possibility that an external force acts on the board connecting portion of the bus bar. In particular, in the electronic component unit, when the board connection portion is fixed to the circuit board by brazing using solder or the like, it is desired that the external force acting on the board connection portion be suppressed.

  The present invention has been made in view of the above circumstances, and has as its object to provide an electronic component unit and a wire harness that can suppress an external force acting on a board connecting portion of a bus bar fixed to a circuit board. And

In order to achieve the above object, an electronic component unit according to the present invention includes a circuit board on which electronic components are mounted, a case accommodating the circuit board, an external connection portion exposed outside the case, A conductive bus bar having a board connection portion accommodated therein and fixed to the circuit board, wherein the bus bar has a case fixing portion fixed to the case, and the case fixing portion is provided on the case. The busbar is a rough surface formed on the facing surface, and is fixed to the case by being formed integrally with the case by insert molding .

  In the electronic component unit, at least a part of the case fixing portion may be provided between the external connection portion and the board connection portion.

  In the electronic component unit, the case may include a radiation fin protruding from an outer surface.

In order to achieve the above object, a wire harness according to the present invention includes a circuit board on which electronic components are mounted, a case for accommodating the circuit board, an external connection part exposed outside the case, and a case accommodated in the case. An electronic component unit including a conductive bus bar having a board connection portion fixed to the circuit board, and an electric wire electrically connected to the bus bar, wherein the bus bar is connected to the case. Having a case fixing portion to be fixed, the case fixing portion is a rough surface formed on a surface facing the case, and the bus bar is integrally formed with the case by insert molding , It is characterized by being fixed to the case .

  The electronic component unit according to the present invention includes a case fixing portion where the bus bar is fixed to the case. Accordingly, the electronic component unit is fixed to the case by the case fixing portion even when an external force acts on the external connection portion of the bus bar, so that the external force can be suppressed from being transmitted to the board connection portion. As a result, the electronic component unit has an effect that an external force acting on the board connecting portion of the bus bar fixed to the circuit board can be suppressed.

FIG. 1 is a perspective view illustrating a schematic configuration of an electronic component unit according to the embodiment. FIG. 2 is an exploded perspective view illustrating a schematic configuration of the electronic component unit according to the embodiment. FIG. 3 is a perspective view illustrating a schematic configuration of a bus bar of the electronic component unit according to the embodiment. FIG. 4 is a perspective view illustrating a part of the electronic component unit according to the embodiment in a cross section. FIG. 5 is an enlarged perspective view showing a portion V in FIG. FIG. 6 is a perspective view illustrating another part of the electronic component unit according to the embodiment in a cross section. FIG. 7 is an enlarged perspective view showing a portion VII in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited by the embodiment. The components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same.

[Embodiment]
FIG. 1 is a perspective view illustrating a schematic configuration of an electronic component unit according to the embodiment. FIG. 2 is an exploded perspective view illustrating a schematic configuration of the electronic component unit according to the embodiment. FIG. 3 is a perspective view illustrating a schematic configuration of a bus bar of the electronic component unit according to the embodiment. FIG. 4 is a perspective view illustrating a part of the electronic component unit according to the embodiment in a cross section. FIG. 5 is an enlarged perspective view showing a portion V in FIG. FIG. 6 is a perspective view illustrating another part of the electronic component unit according to the embodiment in a cross section. FIG. 7 is an enlarged perspective view showing a portion VII in FIG.

  The electronic component unit 1 shown in FIG. 1 according to the present embodiment is mounted on a vehicle such as an automobile, and energizes and disconnects (so-called, on / off) various electronic devices mounted on the vehicle. Here, as shown in FIG. 1, the electronic component unit 1 is incorporated in a wire harness 150, a terminal fitting 152 constituting a connection processing component such as an electric wire 151 is attached, and various electronic components 11 are placed inside the electronic component unit 1. To accommodate. The electronic component unit 1 is installed at a predetermined position of a vehicle, for example, and is connected between a power supply such as a battery and various electronic devices mounted in the vehicle.

  As shown in FIGS. 1 and 2, the electronic component unit 1 includes a circuit board 10 on which various electronic components 11 are mounted, a case 20 for housing the circuit board 10, and a conductive bus bar 30. In the electronic component unit 1, the circuit board 10 is assembled inside the case 20, and the bus bar 30 connects the terminal fitting 152 attached to the end of the electric wire 151 to the electronic component 11 mounted on the circuit board 10.

  The circuit board 10 is formed in a rectangular plate shape, and has an insulating substrate 12 made of an insulating synthetic resin, and a conductive wiring pattern (not shown) formed in a predetermined pattern on the surface of the insulating substrate 12 or the like. ). The circuit board 10 mounts various electronic components 11 on the surface of the insulating substrate 12 or the like. In the circuit board 10, the terminals of the electronic component 11 are fixed to the wiring pattern by brazing (corresponding to welding) using solder or the like. Further, the circuit board 10 is provided with a bus bar fixing portion 13 for fixing the terminal 33 a of the bus bar 30. The bus bar fixing portion 13 is constituted by a through hole 13a (shown in FIG. 5 and the like) penetrating the circuit board 10. The bus bar fixing portion 13 passes the terminal 33a of the bus bar 30 into the through hole 13a, and fixes the end 33a of the bus bar 30 to the wiring pattern by brazing (corresponding to welding) using solder or the like. The wiring pattern of the circuit board 10 electrically connects the bus bar 30 and the electronic component 11.

  The electronic component 11 mounted on the circuit board 10 is an element that performs various functions. Each terminal of the electronic component 11 is fixed to the wiring pattern of the circuit board 10 by brazing using solder or the like. The electronic component 11 of the present embodiment is, for example, a semiconductor relay. That is, the electronic component unit 1 of the present embodiment is a relay unit module. In the present embodiment, six semiconductor relays as electronic components 11 are mounted on the circuit board 10. These six semiconductor relays are provided three by three in the short side direction of the circuit board 10 along the long side direction. In other words, the semiconductor relays are arranged in two rows. In addition, on the circuit board 10, elements such as a relay resistor are mounted in addition to the six semiconductor relays as the electronic component 11.

  The case 20 has a base case 21 as a base part and a bottom case 22 as a lid part, as shown in FIGS. The case 20 has a two-part structure divided into a base case 21 and a bottom case 22. The base case 21 is to which the circuit board 10 is assembled. The bottom case 22 covers the circuit board 10 mounted on the base case 21 from the side opposite to the base case 21. The base case 21 and the bottom case 22 are formed of an insulating synthetic resin.

  Specifically, the base case 21 is a flat box-shaped (tray-shaped) member as shown in FIG. The base case 21 is configured to include a rectangular frame-shaped portion 21a formed in a substantially rectangular shape and a ceiling portion 21b closing the rectangular frame-shaped portion 21a. The ceiling part 21b is formed in a rectangular plate shape having the same shape as the circuit board 10. The rectangular frame part 21a is formed so as to surround the edge of the ceiling part 21b. The ceiling 21b is formed integrally with the rectangular frame 21a at the upper end of the rectangular frame 21a in FIG. The rectangular frame portion 21a is integrally provided with a fixing bracket portion 21c for fixing the case 20, that is, the electronic component unit 1 to a vehicle body. In the present embodiment, the base case 21 is formed of engineering plastic having a thermal conductivity of about 0.2 or a high thermal conductive resin of about 1 to 10.

  The bottom case 22 is a lid-shaped member as shown in FIG. The bottom case 22 is configured to include a rectangular frame-shaped portion 22a formed in a substantially rectangular shape and a bottom portion 22b for closing the rectangular frame-shaped portion 22a. The bottom part 22b is formed in a rectangular plate shape having the same shape as the circuit board 10 and the ceiling part 21b. The rectangular frame portion 22a is formed so as to surround the edge of the bottom portion 22b. The bottom portion 22b is formed integrally with the rectangular frame portion 22a at the lower end in FIG. 2 of the rectangular frame portion 22a.

  The bottom case 22 is assembled to the base case 21 so that the opening of the base case 21 and the opening of the bottom case 22 face each other. In the case 20, the bottom case 22 is locked to the base case 21 via various types of locking mechanisms 23. In FIGS. 1 and 2, the direction in which the base case 21 and the bottom case 22 are stacked (hereinafter, referred to as a stacking direction) is along the vertical direction. In some cases, the stacking direction has a predetermined angle with respect to the vertical direction depending on the state of installation in the vertical direction.

  The bus bar 30 is assembled to the case 20 and is formed of a conductive metal. For example, the bus bar 30 is formed in an elongated plate shape as a whole by press working or the like. In the present embodiment, two bus bars 30 are provided. As shown in FIG. 3, the bus bar 30 is bent from one end of the accommodated portion 31, which is arranged in the case 20 in parallel with the ceiling 21 b, the circuit board 10, and the bottom 22 b. It has an external connection part 32 penetrating the base case 21 and a board connection part 33 which is bent from both edges in the width direction of the accommodated part 31 in a direction opposite to the external connection part 32 and is directly connected to the circuit board 10.

  The external connection portion 32 is exposed outside the case 20, and is supported by a terminal support portion 21 d formed integrally with the base case 21. The external connection portion 32 is supported by the terminal support portion 21d in a state where the central portion is exposed, and a conductive terminal fitting 152 attached to the end of the electric wire 151 is fixed by a bolt 153 or the like. The external connection part 32 is electrically connected to the electric wire 151 via the terminal fitting 152 and the like.

  The board connection part 33 is housed in the case 20 and is directly fixed to the circuit board 10. The board connection part 33 includes a plurality of terminals 33a bent toward the circuit board 10 from both widthwise edges of the other end of the accommodation part 31 separated from the external connection part 32. The terminal 33a of the board connection part 33 is passed through the through hole 13a provided in the circuit board 10, and is fixed to the wiring pattern by brazing (corresponding to welding) using solder. The terminal 33a of the board connection part 33 is electrically connected to the wiring pattern of the circuit board 10.

  In the present embodiment, the bus bar 30 includes a case fixing portion 34 fixed to the case 20. Specifically, the case fixing portion 34 is provided on a surface 31 a of the case 20 of the accommodated portion 31 facing the ceiling portion 21 b of the base case 21. In the present embodiment, the case fixing portion 34 is a rough surface formed on the surface 31a by laser processing or the like. The case fixing portion 34 is formed by inserting the bus bar 30 into an insert molding die, injecting an insulating resin around the bus bar 30, and insert-molding the bus bar 30 integrally with the ceiling portion 21 b of the base case 21. It is fixed to the base case 21 of the case 20. In this embodiment, it is desirable that the case fixing portion 34 is a rough surface having a depth of irregularities of about 50 μm to 250 μm.

  In the present embodiment, the case fixing portion 34 is formed on the front surface 31 a over substantially the entire length of the accommodated portion 31, and at least a part is provided between the external connection portion 32 and the board connection portion 33. The case fixing portion 34 is fixed to the base case 21 of the case 20, and transmits heat generated by the electronic component 11 transmitted from the terminal 33 a to the base case 21.

  Here, in the present embodiment, the base case 21 of the case 20 includes a plurality of radiation fins 24. The radiating fins 24 radiate heat transmitted from the case fixing portion 34 of the bus bar 30 to the outside. A plurality of heat radiation fins 24 protrude from the outer surface of the ceiling portion 21 b of the base case 21 of the case 20 to the outside of the case 20 along the stacking direction of the base case 21 and the bottom case 22. The plurality of radiating fins 24 are formed linearly in parallel with the short side direction of the ceiling portion 21b of the base case 21, and are arranged at intervals. Further, the radiation fins 24 are provided at positions 21e overlapping the case fixing portions 34 of the bus bars 30 in the ceiling portion 21b along the stacking direction. In the present embodiment, the position 21e of the ceiling 21b where the radiation fins 24 are provided is formed so as to protrude toward the bottom 22b of the bottom case 22 from other positions of the ceiling 21b.

  In the electronic component unit 1 having the above-described configuration, the bus bar 30 and the base case 21 are integrally formed by insert molding. Then, the terminal 33 a of the board connection portion 33 of the bus bar 30 is fixed to the circuit board 10 on which the electronic component 11 is mounted by brazing using solder, and the bottom case 22 is attached to the base case 21 so as to close the opening of the base case 21. Assemble. Thus, the electronic component unit 1 is assembled.

  In the assembled electronic component unit 1, the terminal fitting 152 attached to the terminal of the electric wire 151 is fixed to the external connection portion 32 of the bus bar 30 by a bolt 153 or the like, and the fixed bracket portion 21c is fixed to the vehicle body and mounted on the vehicle. You. The electronic component unit 1 constitutes a wire harness 150 arranged in a vehicle such as an automobile, together with an electric wire 151 electrically connected to the bus bar 30 and the like. That is, the wire harness 150 includes the electronic component unit 1 and the electric wires 151 that are electrically connected to the bus bar 30 of the electronic component unit 1.

  When attaching the terminal fitting 152 to the external connection portion 32 with the bolt 153, an external force such as a rotation torque around the axis of the bolt acts on the external connection portion 32 from the bolt 153. This external force is transmitted from the case fixing portion 34 to the base case 21 of the case 20 and is supported by the base case 21 as shown by an arrow in FIG.

  Further, in the electronic component unit 1, the heat generated by the electronic component 11, such as a semiconductor relay, is transmitted to the base case 21 of the case 20 via the case fixing portion 34 of the bus bar 30, as indicated by an arrow in FIG. The heat is radiated to the outside via the radiating fins 24.

  According to the electronic component unit 1 described above, the bus bar 30 includes the case fixing portion 34 that is fixed to the base case 21 of the case 20. Thus, in the electronic component unit 1, even if an external force is applied to the external connection portion 32 of the bus bar 30 from the bolt 153 or the like, the case fixing portion 34 of the bus bar 30 is fixed to the case 20. It is transmitted to the base case 21 of the case 20 via the part 34. As a result, the electronic component unit 1 can suppress transmission of an external force acting on the external connection portion 32 to the board connection portion 33, and acts on the board connection portion 33 of the bus bar 30 directly fixed to the circuit board 10. An external force can be suppressed, and the effect of affecting the connection between the terminal 33a of the board connection portion 33 and the wiring pattern of the circuit board 10 can be suppressed.

  In the electronic component unit 1, a part of the case fixing portion 34 is provided between the external connection portion 32 and the board connection portion 33. Thus, the electronic component unit 1 can transmit the external force acting on the external connection portion 32 of the bus bar 30 to the base case 21 of the case 20 via the case fixing portion 34 without transmitting to the board connection portion 33. As a result, the electronic component unit 1 can suppress the transmission of the external force acting on the external connection portion 32 to the board connection portion 33, and the external force acting on the board connection portion 33 fixed to the circuit board 10 of the bus bar 30. Can be suppressed.

  In the electronic component unit 1, since the case 20 includes the plurality of heat radiation fins 24, the heat generated by the electronic component 11 mounted on the circuit board 10 is transmitted to the base case 21 of the case 20 via the case fixing portion 34. Can be. Further, the electronic component unit 1 is provided at a position where the heat radiation fins 24 overlap the case fixing portion 34 along the stacking direction of the base case 21 and the bottom case 22. As a result, the electronic component unit 1 can reliably transmit the heat generated by the electronic component 11 mounted on the circuit board 10 to the radiation fins 24 of the case 20, and generate the heat generated by the electronic component 11 mounted on the circuit board 10. Can be dissipated.

  Further, the electronic component unit 1 is formed such that a position 21e of the ceiling 21b where the radiating fins 24 are provided protrudes toward the bottom 22b of the bottom case 22 from other positions of the ceiling 21b. Thereby, the electronic component unit 1 can suppress the thickness of the base case 21 and the bottom case 22 in the stacking direction even when the heat radiating fins 24 are provided on the base case 21 of the case 20, and the The efficiency of heat transfer to the case 20 can be improved.

  As described above, even when the bus bar 30 includes the external connection portion 32 and the board connection portion 33 that is directly fixed to the circuit board 10, the electronic component unit 1 applies the external force acting on the external connection portion 32 to the case fixing portion. By transmitting the signal to the case 20 via 34, an external force acting on the board connecting portion 33 can be suppressed.

  Since the wire harness 150 described above includes the electronic component unit 1, it is possible to suppress an external force acting on the board connecting portion 33 directly fixed to the circuit board 10 of the bus bar 30, and to reduce the external force. This has the effect of suppressing the influence on the connection with the wiring pattern of the circuit board 10.

  Note that the electronic component unit 1 according to the present invention is not limited to the above-described embodiment, and various changes can be made within the scope described in the claims. For example, the electronic component unit 1 according to the present invention does not integrally form the case fixing portion 34 of the bus bar 30 with the base case 21 of the case 20 by insert molding. May be fixed to the base case 21 of the case 20. Further, in the embodiment, the electronic component unit 1 has the case fixing portion 34 provided over substantially the entire length of the accommodated portion 31 of the bus bar 30, but in the present invention, the case fixing portion 34 is provided with the external connection portion of the bus bar 30. It may be provided only between 32 and the board connection part 33. In short, in the present invention, at least a part of the case fixing portion 34 may be provided between the external connection portion 32 and the board connection portion 33 in the electronic component unit 1.

  Further, in the present invention, the electronic component unit 1 may form the case fixing portion 34 without making the surface 31a of the accommodation portion 31 of the bus bar 30 rough. Further, in the present invention, the terminal fitting 152 attached to the terminal of the electric wire 151 may be fixed without using the bolt 153 for the external connection part 32, and the terminal or connector of another electronic component unit 1 may be fixed to the external connection part 32. May be fixed. In short, in the present invention, it is sufficient that an external force acts on the external connection portion 32 of the bus bar 30 including vibrations during running of the vehicle, for example, by attaching various articles to the external connection portion 32 of the bus bar 30. In the present invention, the electronic component unit 1 may fix the terminal 33a of the board connection portion 33 of the bus bar 30 to the circuit board 10 by various welding methods without being limited to brazing using solder. In the present invention, the case 20 may have a configuration other than the two-part structure of the base case 21 and the bottom case 22.

DESCRIPTION OF SYMBOLS 1 Electronic component unit 10 Circuit board 11 Electronic component 20 Case 24 Radiation fin 30 Bus bar 32 External connection part 33 Board connection part 34 Case fixing part 150 Wire harness 151 Electric wire

Claims (4)

A circuit board on which electronic components are mounted;
A case for housing the circuit board,
An external connection portion exposed outside the case, and a conductive bus bar having a board connection portion housed in the case and fixed to the circuit board,
The bus bar has a case fixing portion fixed to the case,
The case fixing portion is a rough surface formed on the surface facing the case, and that the bus bar is integrally formed by insert molding with respect to the casing, and characterized in that it is fixed to the casing Do
Electronic component unit. At least a part of the case fixing portion is provided between the external connection portion and the board connection portion,
The electronic component unit according to claim 1. The case,
Equipped with radiation fins protruding from the outer surface,
The electronic component unit according to claim 1. A circuit board on which electronic components are mounted, a case accommodating the circuit board, an external connection part exposed outside the case, and a board connection part housed in the case and fixed to the circuit board; An electronic component unit comprising: a bus bar;
And an electric wire electrically connected to the bus bar,
The bus bar has a case fixing portion fixed to the case,
The case fixing portion is a rough surface formed on the surface facing the case, and that the bus bar is integrally formed by insert molding with respect to the casing, and characterized in that it is fixed to the casing Do
Wire harness.

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