JP2005229674A - Electrical junction box and vehicle attached with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable an electrical junction box to be arranged efficiently to a space restricted in a vehicle, while accommodating other control units, in addition to a power distribution unit and a junction block. <P>SOLUTION: The power distribution unit 20 and the junction block 30 are connected with an attitude which is approximately orthogonal. A junction block, holding part 53 for holding the junction block 30 and a control unit accommodating part 54, are provided in the lower case 50 as a common case for holding these units 20, 30 and the other control unit 40. The lower case 50 is formed so that the power distribution unit 20 is opened out of the case in a direction orthogonal to the direction of aligning the junction block holding part 53 and the control unit accommodating part 54 between this junction block holding part 53 and the control unit accommodating part 54. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electrical junction box provided in a vehicle such as an automobile and a vehicle to which the electrical junction box is attached.

  Conventionally, as a means for distributing power from a common in-vehicle power source to each electronic unit, a distribution circuit is configured by stacking a plurality of bus bar boards, and an electric junction box incorporating a fuse or relay switch is generally known. It has been.

  In recent years, in order to realize the miniaturization of such an electrical junction box and high-speed switching control, a device in which a semiconductor switching element such as an FET is interposed between an input terminal and an output terminal instead of the relay has been developed. Yes.

  However, since the switching element such as the relay or FET generates a relatively large amount of heat, the heat dissipation becomes a problem. As a countermeasure, a plurality of power distribution circuit forming bus bars are fixed on a heat dissipation member via an insulating layer having a high thermal conductivity to constitute a power distribution unit, and the switching element is mounted on the bus bar to generate heat. Is known to escape from the heat radiating member.

For example, in Patent Document 1, there is known an electrical junction box in which the power distribution unit and a junction block including a bus bar substrate that forms a power circuit on the downstream side thereof are coupled in a substantially orthogonal posture and integrated. Yes.
JP 2003-218562 A

  In many cases, the electrical junction box must be arranged in a limited space such as an engine room of a vehicle. For that purpose, it is necessary to efficiently utilize the entire shape of the electrical junction box and efficiently store it in the vehicle.

  For example, in the engine room, an electrical junction box as shown in Patent Document 1, that is, the power distribution unit and the junction block, is formed at a location where the case bottom wall and the side wall protrude greatly inward to form a tire house. In order to mount an electrical junction box that is coupled to each other in a substantially orthogonal posture, the junction block is positioned in a substantially horizontal posture above the protruding portion, and the power distribution unit is substantially lateral to the portion. It is effective to arrange the electrical junction box so that it is positioned in a standing posture. With this arrangement, in addition to being able to effectively use the limited space to install the electrical junction box, the cooling function for exposing the heat dissipating member of the power distribution unit in an upright position to the engine room Can be secured.

  On the other hand, as an issue of the electrical junction box, for the purpose of reducing the number of parts and simplifying the wiring, not only the power distribution unit and the junction block but also other control units are collectively accommodated in the case of the electrical junction box. There is a demand to do. In order to satisfy such requirements, it is necessary to form a part for accommodating the control unit in the case in addition to a part for holding the power distribution unit and the junction block.

  However, as described above, the installation space of the electric junction box is limited, and it is necessary to open the heat radiating member to the outside of the case in order to ensure the cooling performance of the heat radiating member. The major issue is how to secure the control unit accommodation section below. For example, in the electrical junction box attached to the projecting portion corresponding to the tire house as described above, in order to accommodate the control unit in the case while opening the heat dissipation member of the power distribution unit into the engine room, Although it is conceivable to form the control unit accommodating portion at the end opposite to the power distribution unit across the portion holding the junction block, the junction block is arranged at a position directly above the tire house. The outer end portion of the case holding the junction block is close to the side wall of the engine room, and there is no room for forming a control unit accommodating portion for accommodating the control unit at the outer end portion.

  In view of such circumstances, the present invention efficiently accommodates a limited space in a vehicle while accommodating other control units in addition to a power distribution unit and a junction block in a common case in an electrical junction box provided in the vehicle. It is another object of the present invention to provide a technique for ensuring the cooling function of the heat dissipating member provided in the power distribution unit.

  The invention according to claim 1 is a power distribution unit that distributes and outputs input power to a plurality of output units, a junction block that configures a power circuit that connects the output unit of the power distribution unit and an external circuit, and the like. An electrical connection box that is held in a common case and mounted in a vehicle, wherein the power distribution unit includes a heat dissipation member having a circuit fixing surface, and a circuit fixing of the heat dissipation member. A circuit forming body fixed to the surface so as to be capable of transferring heat, and the junction block includes a bus bar substrate including a plurality of bus bars constituting the power circuit, and the direction of the bus bar substrate and the circuit in the power distribution unit The power distribution unit and the junction block are connected so that the directions of the fixing surfaces are substantially orthogonal to each other. A junction block holding unit that holds a junction block, and a control unit that holds the control unit at a position opposite to the junction block across the power distribution unit connected to the junction block held by the junction block holding unit And the heat dissipation member of the power distribution unit is opened between the junction block holding part and the control unit housing part in a direction substantially orthogonal to the direction in which the junction block holding part and the control unit housing part are arranged outside the case. It has a shape.

  According to a second aspect of the present invention, in the electrical junction box according to the first aspect, the end of the power distribution unit or the vicinity thereof and the end of the junction block or the vicinity thereof are connected to each other, An opening between the end of the power distribution unit opposite to the side connected to the junction block is inserted into the portion between the junction block holding portion and the control unit housing portion of the case. The power distribution unit projects out of the case from the opening, and the heat radiating member of the power distribution unit is opened to the outside of the case.

  According to a third aspect of the present invention, in the electrical junction box according to the second aspect, the junction block holding portion of the case holds the junction block from a direction opposite to a direction in which the power distribution unit is inserted into the opening. It is comprised so that it may do.

  According to a fourth aspect of the present invention, in the electrical junction box according to the third aspect, the junction block and the junction block holding portion of the case are fitted to each other as the power distribution unit is inserted into the opening. Thus, a connector for connecting the power circuit of the junction block to an external circuit is provided.

  According to a fifth aspect of the present invention, in the electrical junction box according to the fourth aspect of the present invention, a wiring for connecting the connector and an external circuit is connected to the connector on the junction block holding portion side of the connector. The block holding part is provided with a wiring holding part for holding the wiring.

  The invention according to claim 6 is the electrical junction box according to claim 4 or 5, wherein the junction block and the junction block holding portion of the case are mutually connected in a direction parallel to a direction in which the connectors are fitted. Guide means for guiding the junction block in the same direction by fitting is provided.

  According to a seventh aspect of the present invention, in the electrical junction box according to any one of the first to sixth aspects, the outer surface of the junction block holding portion has a shape corresponding to the shape in the vehicle at the case mounting location. It is what.

  The invention according to claim 8 is the electrical junction box according to claim 7, wherein the case mounting location is a location in the engine room that protrudes inward corresponding to the shape of the tire house. The lower outer surface of the junction block holding portion that holds the junction block in a substantially horizontal posture above the protruding portion has a shape corresponding to the shape of the protruding portion.

  The invention according to claim 9 is a vehicle having a protrusion in the vehicle, and the case of the electrical junction box according to any one of claims 1 to 8 is formed from the same case as the junction block holding portion. The power distribution unit is attached so as to cover the projecting portion with the power distribution unit projecting to the outside.

  According to a tenth aspect of the present invention, in the vehicle to which the electrical junction box according to the ninth aspect is attached, the case of the electrical junction box is a part in the engine room corresponding to the shape of the tire house. The junction block holding part is mounted on the protruding portion so that the junction block holding portion is positioned on the protruding portion and the power distribution unit is positioned on the inner side in the vehicle width direction.

  According to an eleventh aspect of the present invention, in the vehicle to which the electric junction box according to the ninth or tenth aspect is attached, a space between the junction block holding portion and the control unit housing portion of the electric junction box is the front and rear of the vehicle. The case of the electrical junction box is attached so as to open in the direction.

  According to the first aspect of the present invention, the power distribution unit and the junction block are connected so that the direction of the bus bar substrate in the junction block and the direction of the circuit fixing surface in the power distribution unit are substantially orthogonal to each other, and the power distribution unit is sandwiched between In addition to the power distribution unit and the junction block, other control units are accommodated in a common case in a compact manner, and the electrical connection box is provided. Can be arranged in a limited space using a structure in which the power distribution unit and the junction block are connected so as to be substantially orthogonal to each other.

  Here, the power distribution unit is held at a position sandwiched between the junction block holding portion and the control unit housing portion of the case, and the case includes the junction block holding portion and the control unit housing. The heat radiating member of the power distribution unit is open to the outside of the case in a direction substantially perpendicular to the direction in which the junction block holding portion and the control unit housing portion are arranged. It can be brought into direct contact with external air, thereby ensuring the cooling function of the heat dissipating member.

  According to the second aspect of the present invention, since the end of the power distribution unit or the vicinity thereof and the end of the junction block or the vicinity thereof are connected to each other, the power supply unit is connected to the junction block of the power distribution unit. Most of the portions other than the portion that is present can be projected out of the case from the opening formed in the case, and the cooling function of the heat dissipation member of the power distribution unit can be made more efficient.

  According to the invention of claim 3, the junction block is placed at a position where the junction block is held by the junction block holding portion by a series of operations of inserting the power distribution unit connected to the junction block into the opening and a series of operations. Can be set.

  According to the invention which concerns on Claim 4 and 5, the connector provided in the junction block connected with the said power distribution unit by the operation | work which inserts the said power distribution unit into the said opening, and the connector provided in the junction block holding part Are connected to each other, so that the power circuit of the junction block and the external circuit can be connected simultaneously by the above insertion operation.

  According to the invention which concerns on Claim 6, when the said junction block guides by the guide means provided in each at the junction block and the junction block holding | maintenance part at the time of the said insertion operation | work, the said connectors are connected. It can be fitted more smoothly.

  According to the invention which concerns on Claim 7, when the outer surface of the said junction block holding | maintenance part becomes a shape corresponding to the shape in the vehicle in a case attachment location, the space of the part by which this electrical junction box is arrange | positioned is effective. It is possible to arrange an electric junction box by utilizing it.

  According to the invention which concerns on Claim 8, the outer surface of the lower part of the said junction block holding part which hold | maintains the said junction block in a substantially horizontal attitude | position protrudes inward corresponding to the shape of the tire house especially in an engine room. By forming the electrical connection box so that it has a shape corresponding to the shape of the protruding portion, the space in the engine room is relatively difficult to be placed and the space directly above the tire house is effectively utilized. And the degree of freedom of layout in the engine room can be improved.

  According to the invention of claim 9, the case of the electrical junction box is covered at a portion where the protruding portion in the vehicle is present, and the protruding portion is covered with the junction block holding portion and the power distribution unit protruding outside from the case. By mounting in a simple posture, the space around the protruding portion can be effectively utilized to store the electrical junction box in a space-saving manner.

  According to the tenth aspect of the present invention, the electrical connection box can be stored in a space-saving manner by effectively utilizing the space above the portion protruding inward corresponding to the tire house in the engine room. In addition, since the control unit accommodating portion is provided on the opposite side of the junction block holding portion across the power distribution unit, even when the junction block holding portion is installed at a position close to the side wall of the engine room, the control unit accommodating portion is controlled. The case can be mounted satisfactorily without causing interference with the unit accommodating portion.

  According to the eleventh aspect of the invention, since the electrical junction box is attached so that the space between the junction block holding portion of the electrical junction box and the control unit housing portion opens in the front-rear direction of the vehicle, The traveling wind of the vehicle can be efficiently applied to the heat dissipating member of the power distribution unit that is open to the outside of the case in the space, so that the air can be cooled more efficiently.

  The best mode for carrying out the present invention will be described with reference to the drawings.

  In FIG. 1, a state in which the electrical junction box 10 of the present invention is disposed at a location in the engine room of the vehicle and above the location 70 projecting inward corresponding to the shape of the tire house is indicated by a two-dot chain line. Show. The electrical junction box 10 of the present invention can be arranged by effectively utilizing the space above and laterally from the protruding portion 70.

  An exploded perspective view of the electrical junction box 10 is shown in FIG. The electrical junction box 10 includes a power distribution unit 20 that distributes and outputs input power to a plurality of output units, a junction block 30 that configures a power circuit that connects the output unit of the power distribution unit 20 and an external circuit, Another control unit 40 and a case for holding and housing these units 20, 30, 40 are provided, and this case is constituted by a lower case 50 and an upper case 60. In the present specification, for convenience of explanation, the front side in FIG. 2 is assumed to be the front side, and the height direction is assumed to be the vertical direction.

  The junction block 30 is disposed in a substantially horizontal posture, and the power distribution unit 20 is disposed in a posture substantially orthogonal to the junction block 30, and a portion near the end of the power distribution unit 20 and an end of the junction block 30 are arranged. Are connected to each other.

  The control unit 40 is disposed so as to be substantially upright at a position opposite to the junction block 30 with the power distribution unit 20 in between. The control unit 40 constitutes an electric circuit different from the power circuit for power distribution constituted by the power distribution unit 20 and the junction block 30. The control unit 40 is connected to a connector 90 accommodated in the lower case 50 and the upper case 60 by wiring (not shown). Furthermore, wiring (not shown) from the outside is connected to the connector 90, and the control unit 40 is connected to an external circuit via the connector 90.

  The control unit 40 only needs to be arranged for a vehicle other than the power distribution unit 20 and the junction block 30, and corresponds to, for example, a front controller that controls an electric device mounted in the vehicle.

  The lower case 50 and the upper case 60 are made of an insulating material such as synthetic resin, and the case according to the present invention is constituted by these.

  The lower case 50 has a shape that opens upward as a whole, and includes a junction block holding portion 53 that holds the junction block 30 in a substantially horizontal posture, and a control unit housing portion 54 that houses the control unit 40. I have. The junction block holding portion 53 and the control unit accommodating portion 54 both have a bottomed container shape that opens upward, and are arranged side by side at a predetermined interval.

  The upper case 60 has a bottomed container shape that opens downward, and is mounted so as to close the opening of the lower case 50.

  The bottom wall of the lower case 50 has a shape that connects the upper end portion of the junction block holding portion 53 and the upper end portion of the control unit accommodating portion 54, and an opening 55 is provided in this connecting portion. The opening 55 has a shape in which the end of the power distribution unit 20 opposite to the side connected to the junction block 30 can be inserted from the lower case 50. The junction block holding portion 53 holds the junction block 30 from the direction opposite to the direction in which the power distribution unit 20 is inserted into the opening 55 (from the lower side in the illustrated example).

  By setting the holding direction of the junction block holding portion 53 to the above-described direction, the junction block 30 is inserted and inserted in a series of operations to insert the power distribution unit 20 connected to the junction block 30 into the opening 55. The junction block 30 can be set at a position where the junction block holding portion 53 is held.

  A space 534 sandwiched between the junction block holding portion 53 and the control unit housing portion 54 is secured below the opening 55, and the space 534 is secured to the junction block holding portion 53 and the control unit housing portion 54. Are open in a direction substantially perpendicular to the direction in which the two are arranged (in the example shown in the figure, the front-rear direction of the vehicle). Therefore, as shown in FIGS. 3 and 4, most of the power distribution unit 20 inserted into the opening 55 faces the space 534 and is opened in the front-rear direction of the vehicle with respect to the outside of the case. ing.

  Further, as shown in FIGS. 5 and 6, the outer surface of the lower portion of the junction block holding portion 53 corresponds to the shape of the portion 70 protruding inward corresponding to the shape of the tire house described above in the engine room. It has a shape and has an arc shape so that its depth gradually decreases from the front side to the rear side, and as it goes from the outer side in the width direction of the vehicle (from the right side to the left side in the figure) It has an arc shape so that the depth gradually increases.

  As the power distribution unit 20 is inserted into the opening 55, a direction parallel to the insertion direction of the lower surface of the junction block 30 and the bottom wall of the junction block holding portion 53 of the lower case 50 (vertical direction in the illustrated example). ) Are provided with connectors 36 and 56 for connecting the power circuit of the junction block 30 to an external circuit. Of the connectors 36 and 56, the connector 56 on the junction block holding portion 53 side is connected to wiring (not shown) for connecting the connector 56 and an external circuit. The wiring enters the lower case 50 through the wiring holding portion 58 formed by cutting out the front side of the outer surface of the junction block holding portion 53 and is held by the wiring holding portion 58.

  On the other hand, on the rear side of the lower case 50, the outer surface of the lower case 50 is notched to form a wiring holding portion 59, and the above-described external wiring enters the lower case 50 through the wiring holding portion 59 and is described above. It is connected to a connector 90 for the control unit 40.

  Further, the lower surface of the junction block 30 and the bottom wall of the junction block holding portion 53 of the lower case 50 are joined in the same direction by being fitted to each other in a direction parallel to the direction in which the connectors 36 and 56 are fitted. Guide means for guiding the block 30 is provided. The guide means includes a guide pin 37 protruding downward from the lower surface of the junction block 30 and a guide member 57 protruding upward from the bottom wall of the junction block holding portion 53. 37 is inserted.

  In the electrical junction box 10 of the present invention, as described above, the connectors 36 and 56 that fit together in the same direction as the direction in which the power distribution unit 20 is inserted into the opening 55 and the guide means 53 that fits together in the same direction. , 57 are provided in the junction block 30 and the junction block holding portion 53, so that the operation of inserting the power distribution unit 20 into the opening 55 is provided in the junction block 30 connected to the power distribution unit 20. Since the connector 36 and the connector 56 provided in the junction block holding portion 53 are fitted, the power circuit of the junction block 30 and an external circuit can be connected simultaneously by the above insertion operation. In addition, when the insertion block 30 and the junction block holding portion 53 are fitted to each other, the guide means 53 and 57 are respectively fitted to each other so that the junction block 30 is guided, whereby the connectors 36 and 56 are connected to each other. Can be fitted more smoothly.

  Here, in order to explain in detail the structure in which the power distribution unit 20 and the junction block 30 are connected, and the power distribution unit 20 and the junction block 20, FIG. FIG.

  The power distribution unit 20 includes a heat dissipation member 22 and a circuit forming body 24. The heat dissipating member 22 is integrally formed of a material having high heat conductivity such as an aluminum alloy or a copper alloy, and one surface (inner surface) thereof is a flat circuit fixing surface 22a. The other surface (outer surface) is provided with a large number of heat radiation fins 22b. The circuit forming body 24 is fixed on the circuit fixing surface 22a of the heat radiating member 22 so that heat can be transferred. The circuit forming body 24 fixed to the circuit fixing surface 22a of the heat radiating member 22 is covered with a case 21 made of an insulating material such as synthetic resin.

  The circuit forming body 24 includes a control circuit in which a plurality of bus bars 24a constituting an input terminal to which power is input and an output terminal for distributing and outputting the input power are arranged on a substantially same plane. The substrate 24b is bonded via an insulating layer. The control circuit board 24b is disposed between the input terminal and the output terminal and controls driving of switching elements such as the FET 28 and the relay 26 which open and close the circuit. On the control circuit board 24b side of the circuit forming body 24, circuit components such as an IC chip constituting the control circuit are mounted. The bus bar 24a side of the circuit structure 24 is fixed to the circuit fixing surface 22a of the heat radiating member 22 with an adhesive or the like through an insulating layer having high thermal conductivity.

  In order to connect the input / output terminals in the power distribution unit 20 and the control circuit board 24b to an external circuit, the power distribution unit 20 is provided with a power connector 23 and a control circuit connector 25 at the end of the power distribution unit 20. It has been. The connector terminal 24c of the power connector 23 is formed by horizontally bending the end portion of the bus bar 24a constituting the input / output terminal. On the other hand, the control circuit connector 25 has a relay terminal 25a, and the relay terminal 25a is electrically connected to a control circuit formed on the control circuit board 24b by soldering or the like.

  The junction block 30 constitutes a power circuit that connects an input / output terminal of the power distribution unit 20 and an external circuit, and a bus bar layer composed of a plurality of bus bars 32 is formed into a plurality of layers via an insulating plate. A stacked bus bar substrate 34 is provided. The junction block 30 is entirely covered with a case 31 made of an insulating material such as a synthetic resin, and is a substantially plate-like body parallel to the direction of the bus bar substrate 34. On the lower surface side of the bus bar substrate 34 of the case 31, a connector 36 for connecting the power circuit of the junction block 30 to an external circuit and a guide pin 37 for guiding the junction block 30 are formed.

  Among the bus bars 32, there is also a control circuit bus bar 320 that does not constitute a power circuit but constitutes a circuit for connecting a control circuit formed on the control circuit board of the power distribution unit 20 and an external circuit. Existing.

  A predetermined bus bar 32 of the bus bars 32 is bent vertically downward to form a connector terminal 32d of the connector 36. In addition, a predetermined bus bar 32 of the bus bars 32 is bent vertically upward to form terminals 32b for connecting other electrical components and fuse connection terminals 32c. Further, a predetermined bus bar 32 is bent vertically upward near the left end portion of the bus bar substrate 34 to form a connection terminal 32 a for connecting to the power connector 23 of the power distribution unit 20.

  Of the above terminals, the fuse connection terminal 32c is not shown in the figure, but its tip is formed in a bifurcated fork shape so that a fuse can be press-fitted.

  On the other hand, similarly to the control circuit bus bar 320, a predetermined control circuit bus bar 320 is bent upward to form a connection terminal 320a for connection to the control circuit connector 25 of the power distribution unit 20.

  The power distribution unit 20 and the junction block 30 are connected by a relay connector 80 so that the direction of the circuit fixing surface 22a in the power distribution unit 20 and the direction of the bus bar substrate 34 in the junction block 30 are substantially orthogonal to each other. .

  This relay connector 80 has a substantially U-shaped cross section extending in the front-rear direction, and has a connection port connected to the power connector 23 and the control circuit connector 25 of the power distribution unit 20 on the left side, and the above on the lower side. It has a connection port into which the connection terminals 32a and 320a of the junction block 30 are inserted. The relay connector 80 includes a relay terminal 81 that electrically connects the connector terminal 24c of the power connector 23 and the connection terminal 32a, a relay terminal 25a of the control circuit connector 25, and the connection terminal 320a. And a relay terminal 82 for electrical connection. These relay terminals 81 and 82 project into the respective connection ports, and are configured so that the terminals 24c, 25a, 32a, and 320a can be sandwiched between the side walls that form the connection ports. .

  Then, the connector terminal 24c and the relay terminal 25a of the power distribution unit 20 are inserted into the left connection port of the relay connector 80, and the connection terminals 32a and 320a of the junction block 30 are inserted into the lower connection port. The input / output terminals of the power distribution unit 20 and the bus bar 32 of the junction block 30 are electrically connected via the relay terminals 81 and 82 of the relay connector 80, and the control circuit board 24b of the power distribution unit 20 is connected. And the control circuit bus bar 320 of the junction block 30 are electrically connected to each other.

  In the state where the junction block 30 connected so as to be substantially orthogonal to the power distribution unit 20 is held by the junction block holding portion 53 described above, the power distribution unit 20 has an opening formed in the lower case 50 described above. Projecting out of the lower case 50 from 55, the heat radiating member 22 of the power distribution unit 20 is opened in a direction substantially orthogonal to the direction in which the junction block holding portion 53 and the control unit accommodating portion 54 are arranged outside the case.

  In addition, since the power distribution unit 20 and the junction block 30 are connected so as to be substantially orthogonal to each other, as shown in FIG. When the lower case 50 is mounted above the projecting portion 70, the junction block 30 is positioned in a substantially horizontal position above the projecting portion 70, and the power distribution unit 20 is positioned on the inner side in the vehicle width direction. By attaching the lower case 50, the space above the protruding portion 70 can be effectively used to store the electrical junction box 10 in a space-saving manner. In addition, since the control unit accommodating portion 54 is provided on the opposite side of the junction block holding portion 53 with the power distribution unit 20 interposed therebetween, the junction block holding portion 53 is installed at a position close to the side wall 75 of the engine room. However, the lower case 50 can be mounted satisfactorily without causing interference between the side wall 75 and the control unit housing portion 54.

  In this way, the power distribution unit 20 and the junction block 30 are substantially orthogonal, in other words, the direction of the bus bar substrate 34 in the junction block 30 and the direction of the circuit fixing surface 22a in the power distribution unit 20 are substantially orthogonal to each other. The power distribution unit 20 and the junction block 30 are connected to each other, and the other control unit 40 is accommodated on the opposite side of the junction block 30 with the power distribution unit 20 interposed therebetween. In addition to the block 30, the other control unit 40 is compactly accommodated in a common case 50, 60, and the electrical connection box 10 is connected so that the power distribution unit 20 and the junction block 30 are substantially orthogonal to each other. Limited use of structure It can be arranged in over the nest.

  Here, the power distribution unit 20 is held at a position sandwiched between the junction block holding portion 53 and the control unit housing portion 54 of the lower case 50. The lower case 50 is held at the junction block holding portion. A shape in which the heat radiating member 22 of the power distribution unit 20 is opened outside the case in a direction substantially orthogonal to the direction in which the junction block holding portion 53 and the control unit housing portion 54 are arranged between the portion 53 and the control unit housing portion 54. Therefore, the heat radiating member 22 can be brought into direct contact with the air outside the case, thereby ensuring the cooling function of the heat radiating member 22.

  In addition, since the vicinity of the end of the power distribution unit 20 and the end of the junction block 30 are connected to each other, most of the power distribution unit 20 other than the part connected to the junction block 30 is formed in the lower case 50. It can be made to protrude out of the case from the formed opening 55, and the cooling function of the heat dissipation member 22 of the power distribution unit 20 can be made more efficient.

  Furthermore, in the electrical junction box 10 of the present invention, the outer surface of the lower portion of the junction block holding portion 53 that holds the junction block 30 in a substantially horizontal posture projects inward corresponding to the shape of the tire house in the engine room. The electric junction box is formed by having a shape corresponding to the shape of the protruding portion 70 to be used, so that the space directly above the tire house where the equipment in the engine room is relatively difficult to be arranged is effectively utilized. 10 can be arranged, and the degree of freedom of layout in the engine room can be improved.

  Further, as shown in FIG. 1, the lower case 50 is attached so that the space 534 between the junction block holding portion 53 and the control unit housing portion 54 of the lower case 50 opens in the front-rear direction of the vehicle. Further, it is possible to efficiently cool the air by efficiently applying the traveling wind of the vehicle to the heat radiating member 22 of the power distribution unit 20 that is open to the outside of the case in the space 534.

  The arrangement position of the electric junction box 10 of the present invention is not limited to the position above the portion 70 projecting inward corresponding to the shape of the tire house in the engine room as shown in FIG. Is possible. Moreover, the attitude | position which arrange | positions the electrical-connection box 10 can be variously changed by the form.

  For example, even when the electric junction box 10 is arranged in a protruding portion where the side wall of the vehicle protrudes in the horizontal direction, the power distribution unit 20 protruding outside from the junction block holding portion 53 of the lower case 50 and the lower case 50. If the lower case 50 is attached to the projecting part in such a posture as to cover the projecting part, the space around the projecting part can be effectively utilized to store the electrical junction box 10 in a space-saving manner.

  The electrical connection box 10 may have a posture in which, for example, the power distribution unit 20 is substantially upright on the side of the protruding portion, and the junction block 30 is in a substantially horizontal posture below the protruding portion. Alternatively, the power distribution unit 20 may be in a substantially horizontal posture above the protruding portion, and the junction block 30 may be substantially upright on the side of the protruding portion.

  In this case, by forming the outer surface of the junction block holding portion 53 in a shape corresponding to the shape of the protruding portion, the space of the portion where the electric connection box 10 is arranged can be effectively used to make an electric connection box. 10 can be arranged.

  The electrical junction box 10 of the present invention is not limited to the form shown in the present embodiment, and various modifications can be made without departing from the spirit of the electrical connection box 10. For example, the following changes are possible.

  As the guide means according to the present invention, the guide pin 37 or the guide member 57 constituting the above-mentioned guide means may be provided on either the junction block 30 side or the junction block holding portion 53 side, or other guide structure. It is also possible to adopt.

  The connection between the power distribution unit 20 and the junction block 30 is such that the end of the power distribution unit 20 and the vicinity of the end of the junction block 30 are connected to each other, such as the end of the power distribution unit 20 or the vicinity thereof. If the end part of 30 or its vicinity part is mutually connected, most parts of the power distribution unit 20 can be protruded out of a case, and the cooling function of the thermal radiation member 22 can be made efficient.

  Furthermore, the case according to the present invention does not need to be constituted by the lower case 50 and the upper case 60 divided vertically, and the fitting direction of the connectors 36, 56 and the guide means 37, 57 is the left-right direction. You may comprise by the case which is divided | segmented into right and left at the center of the opening 55. FIG.

It is a perspective view which shows the state in which the electrical junction box of this invention is attached above the location which protrudes corresponding to the shape of the tire house in an engine room. It is a disassembled perspective view of the electrical junction box of this invention, (a) is the figure seen from the upper side of the control unit accommodating part side, (b) is the figure seen from the upper part of the junction block holding | maintenance part side. It is a perspective view which shows the state by which the junction block, the power distribution unit, and the control unit were hold | maintained at the lower case among the cases which concern on this invention, (a) is the figure seen from the upper side of the control unit accommodating part side, (b ) Is a view from above of the junction block holding part side. It is a front view which shows the state by which the power distribution unit, the junction block, and the control unit were hold | maintained at the lower case among the cases which concern on this invention. It is II sectional drawing of the said figure. It is II-II sectional drawing of the said figure. It is a front sectional view in the state where a power distribution unit and a junction block concerning the present invention were connected. It is a principal part enlarged view of the said figure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electrical connection box 20 Power distribution unit 22 Heat radiation member 22a Circuit fixation surface 24 Circuit formation body 30 Junction block 32 Bus bar 34 Bus bar board 36 Connector 37,56 Guide pin 40 Control unit 50 Lower case 53 Junction block holding part 54 Control unit accommodating part 55 Opening 57 Guide member 58, 59 Wiring holding part 60 Upper case 70 Protruding part

Claims (11)

  A power distribution unit that distributes and outputs input power to a plurality of output units, a junction block that configures a power circuit that connects the output unit of the power distribution unit and an external circuit, and another control unit are provided. Is an electric junction box that is mounted in a vehicle while being held in a common case, and the power distribution unit is fixed to a heat dissipation member having a circuit fixing surface and to the circuit fixing surface of the heat dissipation member so that heat can be transferred. The junction block includes a bus bar substrate including a plurality of bus bars constituting the power circuit, and the direction of the bus bar substrate and the direction of the circuit fixing surface in the power distribution unit are substantially the same. The power distribution unit and the junction block are connected so that they are orthogonal to each other. A junction block holding portion, and a control unit housing portion for housing the control unit at a position opposite to the junction block with the power distribution unit connected to the junction block held by the junction block holding portion interposed therebetween. The heat dissipation member of the power distribution unit is opened between the junction block holding portion and the control unit housing portion outside the case in a direction substantially perpendicular to the direction in which the junction block holding portion and the control unit housing portion are arranged. An electrical junction box characterized by that.   2. The electrical junction box according to claim 1, wherein an end portion of the power distribution unit or the vicinity thereof and an end portion of the junction block or the vicinity thereof are connected to each other, and the junction block holding portion and the control unit of the case are connected to each other. In the portion between the housing portion, an opening is formed in which the end portion of the power distribution unit opposite to the side connected to the junction block is inserted from the case. An electrical junction box configured so that the power distribution unit protrudes outside the case and a heat radiating member of the power distribution unit is opened to the outside of the case.   The electrical junction box according to claim 2, wherein the junction block holding portion of the case is configured to hold the junction block from a direction opposite to a direction in which the power distribution unit is inserted into the opening. Features an electrical junction box.   The electric junction box according to claim 3, wherein the junction block and the junction block holding portion of the case are fitted to each other as the power distribution unit is inserted into the opening, whereby the power circuit of the junction block is provided. An electrical connection box, characterized in that a connector is provided for connecting to the external circuit.   5. The electrical junction box according to claim 4, wherein a wiring for connecting the connector and an external circuit is connected to the connector on the junction block holding portion side of the connector, and the wiring is held in the junction block holding portion. An electrical junction box provided with a wiring holding portion.   6. The electrical junction box according to claim 4 or 5, wherein the junction block and the junction block holding portion of the case are joined in the same direction by fitting each other in a direction parallel to a direction in which the connectors are fitted. An electrical junction box provided with guide means for guiding the block.   The electrical junction box according to any one of claims 1 to 6, wherein an outer surface of the junction block holding portion has a shape corresponding to a shape inside the vehicle at a case mounting location. .   8. The electrical junction box according to claim 7, wherein the case mounting portion is a portion in an engine room that protrudes inward corresponding to a shape of a tire house, and the junction is located above the protruding portion. An electrical junction box, wherein an outer surface of a lower portion of the junction block holding portion that holds the block in a substantially horizontal posture has a shape corresponding to the shape of the protruding portion.   A vehicle having a protruding portion in the vehicle, wherein the case of the electrical junction box according to any one of claims 1 to 8 includes the junction block holding portion and a power distribution unit protruding outward from the case. A vehicle to which an electrical junction box is mounted, characterized in that the vehicle is mounted in a posture so as to cover the protruding portion.   The vehicle to which the electrical junction box according to claim 9 is attached, the case of the electrical junction box projects to a location in the engine room that projects inward corresponding to the shape of the tire house. A vehicle having an electrical junction box attached thereto, wherein the junction block holding portion is located above the location and the power distribution unit is located inside the vehicle width direction.   In the vehicle to which the electrical junction box according to claim 9 or 10 is attached, the space between the junction block holding portion and the control unit accommodating portion of the electrical junction box is opened toward the front-rear direction of the vehicle. A vehicle having an electric junction box attached thereto, wherein a case of the electric junction box is attached.

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