JP2015089279A - Electric connection box with built-in electronic control unit, and electric connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save space.SOLUTION: An electric connection box 1 with a built-in electronic control unit comprises: an electric connection box 2 as a semi-assy component; a control substrate 40 installed to the electric connection box 2; and a cover part 50 which is attached to an upper surface side of the electric connection box 2 and covers the control substrate 40. The electric connection box 2 houses an internal circuit 20 inside a case part 10. The case part 10 has a plurality of bosses 19 which extend upward and penetrate an upper case housing 12, and the internal circuit 20 and the control substrate 40 are respectively positioned to the case part 10 and the substrate installing part 16 by a plurality of boss insertion holes 28, 43 which are formed so as to be fitted with the bosses 19. The internal substrate 20 and the control substrate 40 are connected to each other by soldering connection terminals 24 penetrating connection holes 44.

Description

  The present invention relates to an electronic control unit mounting type electric junction box and an electric junction box on which an electronic control unit such as an ECU is mounted.

  Conventionally, as an electronic control unit mounting type electric connection box that can be mounted on the upper part of the case portion of the electric connection box, such as an ECU, it is mounted on the electronic control unit, for example, on a tab terminal extending from the internal circuit of the electric connection box An electrical connection box (see Patent Document 1 below) is known in which an internal circuit and a circuit of an electronic control unit are electrically connected by connecting the connected connectors.

JP 2002-58134 A

  However, the electronic control unit mounting type electric connection box of the prior art disclosed in Patent Document 1 connects the internal circuit of the electric connection box and the circuit of the electronic control unit via a tab terminal and a connector. There is a problem that a space for arranging the connector is required, and it is difficult to save the space of the entire electronic control unit mounting type electric junction box.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic control unit mounting type electric junction box and an electric junction box which can solve the above-described problems caused by the prior art and can save space.

  An electronic control unit mounting type electric junction box according to the present invention includes an inner circuit including a lower case housing, a case portion including an upper case housing having a substrate mounting portion on an upper surface, and a bus bar accommodated in the case portion. An electrical connection box provided; an electronic control unit comprising a control board mounted on the board mounting portion of the upper case housing and connected to the internal circuit; and the control board mounted on the board mounting portion of the upper case housing. A cover portion attached to the case portion so as to cover, the lower case housing having a plurality of positioning protrusions extending upward and penetrating the upper case housing, and the internal circuit and the control board are There are a plurality of positioning holes that fit into the positioning protrusions, and the positioning protrusions and the positioning holes fit together, Each of the connection terminals that are positioned with respect to the case portion and extend upward from the internal circuit through the upper case housing passes through a connection hole formed in the control board and is soldered to the control board Thus, they are connected to each other.

  According to the electronic control unit mounting type electrical connection box according to the present invention, the control board mounted on the board mounting portion is soldered to the connection terminal extending upward from the internal circuit, passing through the lower case housing and penetrating the connection hole. As a result, since the internal circuit and the control circuit board are connected to each other, a connector for connecting the internal circuit and the control board is not required, and the space for connection can be saved.

  In addition, the internal circuit and the control board are positioned in the case portion by a plurality of positioning holes that are formed in the lower case housing and extend upward and fit into a plurality of positioning protrusions that penetrate the lower case housing. For this reason, it is possible to reliably align the connection location by soldering between the connection terminal and the control board without applying a mechanical burden due to the displacement of the internal circuit or the control board.

  In one embodiment of the present invention, the board mounting part includes a support part that supports the control board from the lower surface side, and a terminal hole part through which the connection terminal is inserted from the inside of the case part onto the board mounting part. The support portion is formed in a shape that supports the vicinity of the outer peripheral edge portion of the control board along the outer periphery, except for the side surface side of the case portion in the vicinity of the formation position of the terminal hole portion.

  Further, in another embodiment of the present invention, the positioning protrusion is formed in a tapered shape such that the outer diameter of the horizontal section gradually increases from the upper tip side toward the bottom surface side of the lower case housing, The positioning hole has a hole diameter that matches the outer diameter of the horizontal section of the positioning protrusion at the positioning position with respect to the case portion and the substrate mounting portion of each of the internal circuit and the control board.

  In still another embodiment of the present invention, the plurality of positioning protrusions have different outer diameters at the same height.

  An electrical junction box according to the present invention includes a case portion composed of a lower case housing and an upper case housing, and an internal circuit for electrical connection accommodated in the case portion, and the upper case housing is disposed at an upper portion thereof. It has a board mounting part for mounting an electronic control unit comprising a control board connected to the internal circuit, and the upper case housing can be attached with a cover part covering the control board mounted on the board mounting part The lower case housing has a plurality of positioning protrusions extending upward and penetrating the upper case housing, and the plurality of positioning protrusions are formed on the internal circuit and the control board, respectively. The internal circuit and the control board are positioned by fitting with a positioning hole, and the internal circuit passes through the upper case housing and is The connection terminal extends through a connection hole formed in the control board, and is soldered to the control board to connect the internal circuit and the control board. It is characterized by being.

  According to the electrical junction box according to the present invention, the internal circuit can be accommodated in the case part to be a semi-assembled component, and the control board is mounted on the board mounting part and extends upward from the internal circuit to connect to the connection hole. Therefore, a connector for connecting the internal circuit and the control board is not required, and the space of the connection portion can be saved.

  According to the present invention, space saving can be achieved.

It is a perspective view which shows the external appearance of the electronic control unit mounting-type electrical junction box which concerns on one Embodiment of this invention. It is a disassembled perspective view which shows the whole structure of the electronic control unit mounting-type electric junction box. It is a disassembled perspective view which shows the whole structure of the electrical junction box of the same electronic control unit mounting type electrical junction box. It is a perspective view which shows the external appearance of the same electrical junction box. It is a perspective view which shows the state which mounted | wore the same electrical junction box with the control board. It is A arrow directional view of FIG.

  Hereinafter, an electronic control unit mounting type electric junction box and an electric junction box according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing an external appearance of an electronic control unit mounting type electric junction box according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing an entire configuration of the electronic control unit mounting type electric junction box. FIG. 3 is an exploded perspective view showing the overall configuration of the electrical connection box of the electronic control unit mounting type electrical connection box, and FIG. 4 is a perspective view showing the appearance of the electrical connection box. 5 is a perspective view showing a state in which the control board is mounted on the electrical junction box, and FIG. 6 is a view taken in the direction of arrow A in FIG.

  As shown in FIGS. 1 to 3, an electronic control unit mounting type electric connection box (hereinafter referred to as “ECU mounting electric connection box”) 1 according to the present embodiment is mounted on a vehicle such as an automobile, for example, and is semi-assembled. An electrical connection box 2 as a component, an electronic control unit (hereinafter referred to as “control board”) 40 composed of a control board mounted on the electrical connection box 2, and a control mounted on the upper surface side of the electrical connection box 2. The cover part 50 which covers the board | substrate 40 is provided and comprised. The electrical junction box 2 is configured by accommodating an internal circuit 20 inside a rectangular case portion 10. The case part 10 and the cover part 50 consist of a resin molding member, for example.

  The case portion 10 includes, for example, a lower case housing 11 disposed on the bottom surface side of the electrical junction box 2 and an upper case housing 12 attached above the lower case housing 11. Both case housings 11 and 12 are detachably engaged with each other by a known lock mechanism 13 including engagement protrusions formed at positions corresponding to each other on each side surface and engagement grooves into which the protrusions fit. The case portion 10 is formed by combining.

  The lower case housing 11 is formed with a connector portion 15 (see FIG. 6) for external connection projecting downward from the bottom surface, and a plurality of terminal accommodating chambers 17 for accommodating various terminals of the internal circuit 20 and the like. ing. The lower case housing 11 is formed with a plurality of positioning bosses 19 extending upward from the bottom surface by a predetermined length and penetrating the upper case housing 12. Furthermore, the lower case housing 11 is formed with a screw hole 49 in which a screw to be screwed and fixed to the upper case housing 12 is screwed at a predetermined position.

  On the other hand, on the upper case housing 12, a connector portion 14 to which an external connector (not shown) is fitted and connected, and a control board 40 to be described later that is mounted on the case portion 10 and covered with a cover portion 50 are placed. A substrate mounting portion 16 is provided. The board mounting portion 16 is formed in a flat shape without a so-called peripheral wall on the upper surface of the upper case housing 12 constituting the upper surface of the case portion 10.

  The board mounting section 16 includes a board support section 18 that supports the mounted control board 40 from its lower surface side, and a connection terminal 24 that extends upward from the internal circuit 20 from the inside of the case section 10 to the board mounting section 16. And a terminal hole portion 31 to be inserted through the terminal hole. Further, the board mounting portion 16 is formed with a boss insertion hole 32 at a corresponding position where the boss 19 of the lower case housing 11 is inserted.

  Further, a screw hole 48 is formed in a plane region of the board mounting portion 16 of the upper case housing 12 at a position corresponding to the screwing hole 49 of the lower case housing 11. Therefore, both the case housings 11 and 12 can be fixed by screwing with the screw 47 after being engaged by the lock mechanism 13 described above.

As a result, as shown in FIG. 4, in the ECU-equipped electrical junction box 1 according to this embodiment, the electrical junction box 2 in which the internal circuit 20 is accommodated in the case portion 10 is completed and provided as one semi-assy component. Is possible. That is, the internal circuit 20 side can be configured in advance as a completed electrical system, and by combining the control board 40 having electronic circuits of various circuit patterns in accordance with this, for example, it differs for each vehicle type or grade. An ECU-equipped electrical junction box 1 is provided.
And in the electrical junction box 2 of this embodiment, it becomes possible to implement | achieve extremely high versatility, without using the case part 10 which changes for every vehicle model or grade, for example.

  And since the connection terminal 24 of the internal circuit 20 is exposed from the terminal hole part 31 in the state which completed the electrical connection box 2 as a semi-assy component as mentioned above, not only an external appearance inspection but this exposed connection terminal Various tests such as a withstand voltage test for applying a voltage to the internal circuit 20 using 24 can be performed.

  The board support part 18 supports the vicinity of the outer peripheral edge of the control board 40 mounted on the board mounting part 16 along the outer periphery of the board except the side surface side of the case part 10 near the position where the terminal hole 31 is formed. It is formed in the shape to do. That is, the substrate support portion 18 is formed so that the side wall of the substrate mounting portion 16 is notched in the vicinity of the position where the terminal hole portion 31 is formed.

  In the internal circuit 20 accommodated in the case portion 10 thus configured, an electrical circuit for electrical connection (for power distribution) including electrical components such as a bus bar, a relay, and a fuse is formed. That is, the internal circuit 20 is designed in advance so that it can be applied without changing the circuit pattern of the internal circuit 20 in the case unit 10 even if the control board 40 mounted on the electrical junction box 2 is changed. It has been done.

  The internal circuit 20 is composed of a laminated substrate having a three-layer structure in which, for example, the lower layer substrate 21, the middle layer substrate 22, and the upper layer substrate 23 are superposed in the order close to the lower case housing 11, and mainly has a power distribution function in the electrical junction box 1. It is configured as a circuit. For example, a bus bar circuit including a bus bar 25 is formed on the lower layer substrate 21, and the middle layer substrate 22 and the upper layer substrate 23 are accommodated in a tab terminal 26 extending upward or in a terminal accommodating chamber 17 of the lower case housing 11 extending downward. A plurality of press contact terminals 27 are provided.

  Although not shown, a wiring layer to which the above-described electrical components 29 such as relays and fuses are connected is formed on the upper substrate 23, and the electrical components 29 are mounted on the intermediate substrate 22. Further, the middle layer substrate 22 plays a role as a relay substrate between the lower layer substrate 21 and the upper layer substrate 23. Further, a connection terminal 24 that is soldered through the connection hole 44 of the control board 40 mounted on the board mounting portion 16 is provided on a part of the side portion of the intermediate layer board 22.

  Therefore, the intermediate layer board 22 also serves as a relay board between the internal circuit 20 and the control board 40, and the connection terminal 24 functions as a relay terminal. Since the internal circuit 20 and the control board 40 are connected by soldering the connection terminals 24 that have passed through the connection holes 44, compared to the case where the internal circuit 20 and the control board 40 are connected by a connector. It is possible to easily connect at low cost while suppressing the height in the vertical direction and the width and length in the horizontal direction. The internal circuit 20 also has a boss insertion hole 28 through which the boss 19 described above is inserted at a predetermined location.

  On the other hand, as shown in FIG. 5, for example, an electronic circuit on which an electronic component 41 connected to the internal circuit 20 is mounted is formed on the control board 40 placed on the board mounting unit 16 and mounted on the case unit 10. Has been. The control board 40 is detachably attached to the case unit 10. For example, the type of the control board to be attached is changed according to a different control mode for each vehicle type or grade.

  A plurality of electronic components 41 are mounted on the control board 40, and a connector portion 42 that is disposed at a predetermined location on the board and is connected to an external connector of an external circuit (not shown) is mounted. Further, the control board 40 is provided with the connection holes 44 inserted into the connection circuit 24 provided in the internal circuit 20 and connected by soldering as described above, and the boss 19 extending from the lower case housing 11 is inserted. Boss insertion holes 43 are provided at predetermined locations.

  Further, a screw hole 45 corresponding to a screwing hole 18 a formed at a predetermined position of the board support portion 18 of the board mounting portion 16 is formed at a predetermined position of the outer peripheral edge portion of the control board 40. As a result, the control board 40 is mounted on the board mounting portion 16, and is then screwed and fixed to the case portion 10 with the screw 46.

  As shown in FIG. 6, the connection state of the connection terminal 24 of the internal circuit 20 and the control substrate 40 by the solder connection has no peripheral wall in the substrate mounting portion 16 and the substrate mounting in the vicinity of the position where the terminal hole portion 31 is formed. Since the side wall of the part 16 is cut out and the substrate support part 18 is formed on the back side of the terminal hole part 31 when viewed from the side, it is easily confirmed by visual recognition from the side surface of the case part 10. can do.

  The cover unit 50 is attached to the case unit 10 so as to entirely cover the control substrate 40 mounted on the substrate mounting unit 16. The cover portion 50 is formed with a screw hole 59 for inserting the screw 58 and stopping the cover portion 50 at a position corresponding to the screw hole 19a at the tip of the boss 19 extending from the lower case housing 11, for example. Thus, after the cover part 50 is attached to the case part 10, it is screwed and fixed by the screw 58, whereby the assembly of the electrical junction box 1 is completed.

  The cover portion 50 has an opening formed on the upper surface side, a connector mounting portion 51 on which a connector portion 42 provided on the control board 40 attached to the case portion 10 is disposed, and a lower side from the side end portion. A peripheral wall portion 52 that extends and surrounds the outer peripheral side of the control board 40 and is inserted into and fixed to a groove-shaped peripheral wall insertion portion 10a formed on the side surface of the upper case housing 12 of the case portion 10. Is provided.

  In the ECU-equipped electrical junction box 1 configured as described above, the internal circuit 20 and the control board 40 are soldered to the control board 40 mounted on the flat board mounting portion 16 and the connection terminal 24 of the internal circuit 20. Since no connection space for a connector or the like for connection is required, the space can be saved.

  Further, the internal circuit 20 and the control board 40 are connected to the case part 10 and the board mounting part 16 by a plurality of boss insertion holes 28 and 43 respectively formed so as to be fitted to the bosses 19 extending from the lower case housing 11. Since each is positioned, the internal circuit 20 and the control board 40 can be easily attached.

  In this embodiment, the boss 19 is positioned not only with the internal circuit 20 and the control board 40 but also with the lower case housing 11 through the boss insertion hole 32 of the upper case housing 12 and the cover portion 50 with respect to the case portion 10. In order to be used for positioning through the screw hole 59, it extends upward from the bottom surface with a predetermined length. The height of the boss 19 is set to be higher than at least the height of the connection terminal 24 that has passed through the connection hole 44.

  In addition, the boss 19 may be formed in a tapered shape such that the outer diameter of the horizontal section gradually increases from the front end side where the screw hole 19a is provided to the bottom surface side, for example. In this case, the boss insertion holes 28 and 43 coincide with the horizontal cross-section outer diameter of the boss 19 at the position of the internal circuit 20 and the control board 40 with respect to the case part 10 and the position of the board mounting part 16, for example. It may be formed with a hole diameter. In this way, the mounting positions of the internal circuit 20 and the boss 19 of the control board 40 in the length direction are determined, so that the positioning can be performed more reliably.

  As described above, when the internal circuit 20 and the control board 40 are connected by soldering the connection terminals 24 that have passed through the connection holes 44, the absolute connection portion is different from the conventional connector connection. There will be less play. In such a state, for example, if the mounting position of the control board 40 on the board mounting portion 16 is shifted, an excessive load is applied to the soldered portion of the control board 40 and the connection terminal 24. However, according to the structure of the electrical junction box 1 according to the present embodiment, since the boss 19 and the boss insertion holes 28 and 43 are provided, the soldering portion is not burdened and connection reliability is ensured. be able to.

  In addition, this invention is not limited to embodiment mentioned above. For example, the outer diameters at the same height of the plurality of bosses 19 are set to different outer diameters, and the boss insertion holes 28 and 43 formed in the internal circuit 20 and the control board 40 are adapted to the outer diameters of the respective bosses 19. If the outer diameter is used, it is possible to prevent the internal circuit 20 and the control board 40 from being assembled in the wrong direction.

1 Electronic control unit mounted electrical junction box (ECU mounted electrical junction box)
2 Electrical connection box 10 Case part 10a Peripheral wall insertion part 11 Lower case housing 12 Upper case housing 13 Lock mechanism 14 Connector part 15 Connector part 16 Board mounting part 17 Terminal accommodating chamber 18 Board support part 19 Boss 20 Internal board 21 Lower layer board 22 Middle layer Board 23 Upper layer board 24 Connection terminal 28 Boss insertion hole 31 Terminal hole 40 Electronic control unit (control board)
42 Connector part 43 Boss insertion hole 44 Connection hole 50 Cover part 51 Connector mounting part 52 Perimeter wall part

Claims (5)

An electric junction box including a lower case housing and a case portion comprising an upper case housing having a substrate mounting portion on the upper surface, and an internal circuit including a bus bar housed in the case portion;
An electronic control unit comprising a control board mounted on the board mounting portion of the upper case housing and connected to the internal circuit;
A cover part attached to the case part so as to cover the control board attached to the board attachment part of the upper case housing,
The lower case housing has a plurality of positioning protrusions extending upward and penetrating the upper case housing;
The internal circuit and the control board have a plurality of positioning holes that fit into the positioning protrusions, and are positioned with respect to the case portion by fitting the positioning protrusions and the positioning holes, respectively. The connection terminals extending upward from the internal circuit through the upper case housing pass through the connection holes formed in the control board and are soldered to the control board so as to be connected to each other. An electrical connection box with an electronic control unit. The substrate mounting part is
A support portion for supporting the control board from the lower surface side;
A terminal hole through which the connection terminal is inserted from the inside of the case portion onto the substrate mounting portion;
The support portion is formed in a shape that supports the vicinity of the outer peripheral edge portion of the control board along the outer periphery, except for the side surface side of the case portion in the vicinity of the formation position of the terminal hole portion. The electronic control unit mounting type electric junction box according to claim 1. The positioning projection is formed in a tapered shape such that the outer diameter of the horizontal section gradually increases from the upper tip side toward the bottom surface side of the lower case housing,
The positioning hole has a hole diameter that matches the outer diameter of the horizontal section of the positioning projection at a positioning position with respect to the case portion and the substrate mounting portion of each of the internal circuit and the control board. Or the electronic control unit mounting-type electric junction box of 2.   The electronic control unit mounting type electrical junction box according to any one of claims 1 to 3, wherein the plurality of positioning protrusions have different outer diameters at the same height. A case portion comprising a lower case housing and an upper case housing;
An internal circuit for electrical connection housed inside the case portion,
The upper case housing has a board mounting portion for mounting an electronic control unit including a control board connected to the internal circuit on the upper case housing,
The upper case housing is configured to be capable of attaching a cover part that covers the control board mounted on the board mounting part,
The lower case housing has a plurality of positioning protrusions extending upward and penetrating the upper case housing;
The plurality of positioning protrusions are fitted to a plurality of positioning holes respectively formed in the internal circuit and the control board to position the internal circuit and the control board,
The internal circuit has a connection terminal that extends upward through the upper case housing;
The connection terminal passes through a connection hole formed in the control board and is soldered to the control board, thereby connecting the internal circuit and the control board. Connection box.

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