JP2007259594A - Electrical connection box and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical connection box where space saving of a positioning structure can be attained, while enhancing the flexibility in design, and to provide its manufacturing method. <P>SOLUTION: Three members of a frame 30, a circuit constituent 10 and a heat dissipating plate 20 are positioned with high accuracy by positioning means provided at two positions. If the positioning means is to be provided at one position between every other two members as conventionally, the positioning means must be provided at at least four positions in total. However, since three members can be positioned by a positioning means provided at one position, the positioning means need to be provided at only two positions. Consequently, flexibility is increased in the design, as compared with prior art, and space saving of a positioning structure can be attained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electrical junction box and a manufacturing method thereof.

The thing of patent document 1 is known as an electrical junction box mounted in a motor vehicle etc. The electrical junction box includes a circuit structure having a plurality of bus bars bonded to the lower surface, a frame that surrounds the circuit structure, and a heat sink that is attached so as to close the opening of the frame from below. Yes. Some of the bus bars bonded to the circuit structure are extended from the circuit structure so as to be bent along the upper surface of the frame. A boss protruding upward is provided on the upper surface of the frame, and a through-hole through which the boss can penetrate is formed at a position corresponding to the boss in the extended portion of the bus bar. And positioning of a frame and a circuit structure is performed by letting a boss penetrate to a penetration hole. In addition, a recess corresponding to the heat sink is formed in the portion corresponding to the heat sink on the lower surface of the frame body. Thereby, positioning with a frame and a heat sink is performed.
JP 2005-304105 A

  However, in the structure as described above, positioning by two members is performed by one positioning means, that is, in order to perform positioning of the three members of the circuit component, the frame, and the heat sink. Locating means must be provided in at least two locations, one for each member. For this reason, there has been a problem that the degree of freedom in design is low and it is difficult to save the space for the structure related to positioning. In particular, in order to increase the positioning accuracy, if positioning is to be performed at a plurality of positions between the respective members, for example, at two positions between the respective members, positioning means must be provided at least at a total of four positions. There was a problem that the restriction of increased.

  The present invention has been completed based on the above circumstances, and provides an electrical junction box and a manufacturing method thereof that can increase the degree of freedom in design and can save space in the structure related to positioning. With the goal.

  As means for achieving the above-mentioned object, the invention of claim 1 is a circuit structure in which a bus bar is stacked on an insulating circuit board, a heat dissipation member that is stacked on one surface of the circuit structure, A frame body disposed on the other surface of the circuit structure body and fixed to the heat dissipation member in a state where the circuit structure body is sandwiched between the circuit structure body and the circuit structure in the surface direction of the circuit structure body An electrical junction box comprising: a body, a heat radiating member, and a positioning means for positioning the frame body, wherein the positioning means is a portion of the circuit component that is sandwiched between the heat radiating member and the frame body A through hole penetrating the circuit component in the thickness direction, a positioning projection provided on one of the heat radiating member and the frame, and the heat radiating member. And the frame body Characterized by the convex portion provided in the other where having a recess for positioning fittable.

  According to a second aspect of the present invention, in the first aspect of the present invention, the through hole of the positioning means is formed in a positioning plate made of the same material as the bus bar in the circuit structure. Have

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the shape of the cross section of the convex portion, the concave portion, and the through hole in the surface direction of the circuit structure is non-circular. Has characteristics.

  According to a fourth aspect of the present invention, the positioning means according to any one of the first to third aspects is provided at a plurality of locations, and the convex portion, the concave portion and the through-hole according to at least one of the positioning means. The shape of the cross section of the hole in the surface direction of the circuit structure is characterized by a circular shape.

  According to a fifth aspect of the present invention, in the device according to any one of the first to fourth aspects, the circuit configuration body is disposed with respect to the other of the heat dissipation member provided with the recess and the frame body. The connector is attached from the side opposite to the side, and the concave portion is configured to penetrate the other of the heat dissipation member and the frame body in the protruding direction of the convex portion, and the convex portion is the concave portion And the tip of the positioning member protrudes from the other of the heat radiating member and the frame to the side opposite to the side where the circuit component is disposed. It is characterized in that it has a fitting portion that is provided and can be fitted to the tip of the convex portion.

  According to a sixth aspect of the present invention, a circuit configuration body in which a bus bar is stacked on an insulating circuit board, a heat dissipating member superimposed on one surface of the circuit configuration body, and the other surface of the circuit configuration body are arranged. And a frame body fixed to the heat dissipation member in a state where the circuit structure body is sandwiched between the circuit structure body and the circuit structure body, the heat dissipation member and the frame body in the surface direction of the circuit structure body Positioning means for performing the positioning, and the positioning means is provided in a portion sandwiched between the heat radiating member and the frame body in the circuit configuration body, and a through-hole penetrating the circuit configuration body in the thickness direction. The positioning projection provided on one of the heat radiating member and the frame and capable of penetrating the through hole, and the projection provided on the other of the heat radiating member and the frame can be fitted to the projection. A recess for positioning, A method of manufacturing an electrical junction box, wherein one of the heat dissipating member provided with the convex portion and the frame body is installed in a posture in which the protruding direction of the convex portion is directed upward; and A first positioning step in which the circuit component is overlaid from above one of the heat dissipation member and the frame body while passing the through hole through the convex portion; and the concave portion is fitted to the tip of the convex portion. However, the circuit component is sandwiched between the heat dissipating member and the frame, and a second positioning step in which the other of the heat dissipating member and the frame provided with the recess is overlapped from above the circuit component. It has the characteristic in the place which performs the fixing process which fixes the said heat radiating member and the said frame in a state.

  The invention according to claim 7 is arranged on a circuit structure in which a bus bar is stacked on an insulating circuit board, a heat radiation member superimposed on one surface of the circuit structure, and the other surface of the circuit structure. And a frame body fixed to the heat radiating member in a state where the circuit structural body is sandwiched between the heat radiating member and the side opposite to the side where the circuit structural body is disposed with respect to the heat radiating member or the frame body And a positioning means for positioning the circuit configuration body, the heat radiating member, the frame body and the connector in the surface direction of the circuit configuration body, and the positioning means of the circuit configuration body A through hole provided in a portion sandwiched between the heat radiating member and the frame body and penetrating in the thickness direction of the circuit component; and the through hole provided in one of the heat radiating member and the frame body; The other of the heat radiating member and the frame body can be penetrated, and the front end thereof protrudes from the other of the heat radiating member and the frame body to the side opposite to the side on which the circuit component is disposed. A positioning convex portion, a positioning concave portion provided on the other of the heat dissipation member and the frame body so that the convex portion can pass therethrough, and a convex portion provided on the connector. And a fitting part that can be fitted to the tip part, wherein one of the heat dissipating member provided with the convex part and the frame body is projected in the protruding direction of the convex part. And a first positioning step of overlapping the circuit component from above one of the heat radiating member and the frame body while passing the through hole through the convex portion, Let the concave part penetrate the convex part. A second positioning step in which the other of the heat dissipating member and the frame body provided with the dent is overlapped from above the circuit structure, and the fitting portion is fitted to the tip of the convex portion A third positioning step of placing a connector on the other of the heat radiating member and the frame body from above; and the heat radiating member and the heat radiating member in a state where the circuit component is sandwiched between the heat radiating member and the frame body And a fixing step of fixing the frame and the connector.

<Invention of Claim 1>
According to the first aspect of the present invention, the positioning of the three members of the circuit structure, the heat radiating member, and the frame can be performed by the positioning means provided at one place. Space saving of the structure related to positioning can be achieved. Further, when it is necessary to provide a positioning means for every two members as in the prior art, in order to increase the positioning accuracy, for example, when trying to position each member at two locations, Positioning means must be provided at two places at intervals, that is, a total of four places. However, according to the configuration of the present invention, the positioning of the three members can be performed by one positioning means. Therefore, when trying to position each member at two places, it is only necessary to provide the positioning means at two places in total. That's it.

<Invention of Claim 2>
According to the invention of claim 2, the through hole of the circuit structure is formed in the positioning plate made of the same material as the bus bar, and is electrically separated from the bus bar. Thus, it is possible to reliably prevent electrical leakage between the circuit structure and the heat dissipation member. Further, since the positioning plate is made of the same material as the bus bar, it can be formed at the same time as the bus bar is formed.

<Invention of Claim 3>
According to invention of Claim 3, since the shape of the cross section of a convex part, a crevice, and a penetration hole has made non-circularity, a circuit constituent object, with positioning means constituted from this convex part, a crevice, and a penetration hole, The frame body and the heat radiating member are positioned in a state in which the frame body and the heat radiating member are unlikely to be displaced from each other in the rotational direction.

<Invention of Claim 4>
According to the invention of claim 4, the circuit component, the frame body and the heat radiating member rotate with respect to each other about the axis of the convex portion by the positioning means comprising the convex portion, the concave portion and the through hole having a circular cross section. Positioning is possible in a state that can be displaced in the direction. Accordingly, positioning means are provided at a plurality of locations, and even if a molding error occurs in any of them, the molding error is adjusted by shifting the respective members in the rotational direction at least at the location where the positioning device is provided. be able to. Thereby, it becomes difficult to fit the positioning means due to the molding error, and it is possible to avoid the deterioration of the assembling workability.

<Invention of Claim 5>
According to the invention of claim 5, the positioning of the four members of the circuit component, the heat radiating member, the frame, and the connector can be performed by the positioning means provided at one place. Therefore, compared to the case where positioning means are provided at one location every two members, that is, at least three locations in the four members of the circuit component, the heat radiating member, the frame and the connector, the degree of freedom of design is increased and the structure relating to positioning Can be saved.

<Invention of Claim 6>
According to the invention of claim 6, when assembling the electric junction box, after installing one of the heat dissipation member provided with the convex portion and the frame body in a posture with the convex portion facing upward, The circuit component is stacked from above while penetrating the through hole in the convex portion, and then the other of the heat dissipation member and the frame body provided with the concave portion is stacked from above while the concave portion is fitted to the tip of the convex portion. Thereby, positioning of three members, a circuit structure, a heat radiating member, and a frame, can be performed simultaneously. As described above, since the three members can be positioned by simply stacking the circuit structure, the heat radiating member, and the frame from above, the work flow is good, and the workability related to assembly is improved.

<Invention of Claim 7>
According to the invention of claim 7, when assembling the electrical junction box, after installing one of the heat dissipation member provided with the convex portion and the frame body in a posture with the convex portion facing upward, The circuit component is overlapped from above while penetrating the through hole in the convex portion, and then the other of the heat dissipation member and the frame body provided with the concave portion is overlapped from above while penetrating the concave portion in the convex portion. Next, the connector is placed on the other of the heat radiating member and the frame body from above while fitting the fitting portion at the tip of the convex portion, so that the circuit component, the heat radiating member, the frame body, and the connector 4 The members can be positioned simultaneously. As described above, since the four members can be positioned by simply stacking the circuit component, the heat radiating member, the frame, and the connector from above, the work flow is good and the workability related to assembly is improved.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2 are an external perspective view and a side sectional view of the electrical junction box in the present embodiment.
The electrical junction box of the present embodiment is arranged on the substantially same plane as a power distribution board (not shown), accommodated in a casing, and used by being mounted on a vehicle. And the circuit structure 10 with which the electrical-connection box was equipped is connected to a power distribution board. Hereinafter, in each component member, the upper side in FIG. 1 will be described as the front side, and the lower side will be described as the back side.

  As shown in FIG. 1, the circuit structure 10 includes an insulating circuit board 11 having a rectangular plate shape as a whole, and a conductor pattern (not shown) constituting a control circuit is formed on the surface thereof. In addition, an electrical component 12 such as a relay is mounted. A plurality of bus bars 13 are affixed to the back surface of the circuit board 11 via an insulating thin adhesive sheet (not shown).

  The plurality of bus bars 13 attached to the back surface of the circuit board 11 are formed by punching a metal plate excellent in conductivity, and form a predetermined conductive path that becomes a power circuit. Each bus bar 13 extends from the peripheral edge of the circuit board 11, and the bus bar extending part 13 </ b> A extending from one side edge of both long side edges of the circuit board 11 is a power distribution board. To be connected to. Each bus bar extending portion 13 </ b> A has a shape in which a tip is bent upward in a portion extending from the side edge portion of the circuit board 11.

  A large number of through holes 14 are arranged at one end in the longitudinal direction of the circuit structure 10 so as to penetrate the circuit structure 10 in the front and back direction (the thickness direction of the circuit board 11). A plurality of through holes 14 are arranged in the short direction of the circuit structure 10 and are arranged in two stages in the longitudinal direction. A terminal fitting 41 of a connector 40 described later is inserted into the through hole 14.

  A heat radiating plate 20 (corresponding to a heat radiating member of the present invention) is attached to the back surface of the circuit structure 10 (that is, the back surface of the bus bar 13) via an insulating adhesive (not shown). The heat radiating plate 20 is made of a metal such as aluminum having high thermal conductivity, and radiates heat generated from the electrical component 12 such as a relay and the bus bar 13 mounted on the circuit board 11. The heat radiating plate 20 is formed to be slightly larger than the outer shape of the circuit board 11 and has a substantially rectangular plate shape covering almost the entire surface excluding the front end portion of the bus bar extending portion 13A. In addition, a case for housing the circuit structure 10 is configured.

  As shown in FIG. 2, the heat radiating plate 20 is opened at a position corresponding to the through hole 14 of the circuit structure 10 so as to penetrate the heat radiating plate 20 in the front and back direction (the plate thickness direction of the heat radiating plate 20). An opening 21 is formed. The opening 21 is formed in a rectangular shape surrounding an area where the plurality of through holes 14 are arranged. When the heat sink 20 is attached to the back surface of the circuit component 10, the opening 21 is interposed through the opening 21. The through hole 14 is opened behind the heat sink 20.

In addition, as shown in FIGS. 3 and 4, the heat sink 20 is provided with through screw holes 24 at a total of six locations. The through screw holes 24 are formed at four corner portions in the peripheral portion of the heat radiating plate 20 (a portion corresponding to a frame body 30 described later) and at approximately two central positions in the longitudinal direction. Each through screw hole 24 is formed so as to penetrate the heat radiating plate 20 in the front and back direction (plate thickness direction), and the cross-sectional shape in the horizontal direction (the plate surface direction of the heat radiating plate 20) is circular.
In addition, the attachment piece 22 is formed in the attitude | position which escaped diagonally back from the edge on the opposite side to the side in which the opening part 21 in the longitudinal direction of the heat sink 20 was provided.

  As shown in FIG. 1, a frame body 30 having a substantially rectangular frame shape into which the circuit board 11 can be fitted almost tightly is provided at the periphery of the circuit structure 10. The frame 30 is formed of an insulating material such as a synthetic resin so as to be along the peripheral edge of the heat sink 20. The frame body 30 is arranged on the front side of the portion of the bus bar 13 that extends from the peripheral portion of the circuit board 11, and the extended portion is connected to the back surface of the frame body 30 and the surface of the heat sink 20. It is in a state of being sandwiched between. Further, the side frame portion corresponding to the bus bar extending portion 13A in the frame 30 is arranged closer to the circuit board 11 than the bus bar extending portion 13A. Insulating ribs 31 projecting outward are provided on the outer side surfaces of the side frame portions, and are respectively inserted between the bus bar extending portions 13A. In addition, a connecting portion 32 in a form in which both side frame portions on the long side of the frame body 30 are connected is formed at a substantially central position in the longitudinal direction of the frame body 30.

Further, as shown in FIG. 3, screw holes 35 are provided in the frame 30 at positions corresponding to the through screw holes 24 of the heat radiating plate 20 in a total of six locations. Specifically, the screw holes 35 are formed at four corners of the frame body 30 and at two substantially central positions in the longitudinal direction (positions corresponding to both ends of the connecting portion 32). As shown in FIG. 2, each screw hole 35 is formed so that a screw S can be screwed from the back surface side (the heat radiating plate 20 side) of the frame body 30. The cross-sectional shape in the horizontal direction of the screw hole 35 is circular as in the case of the through screw hole 24 of the heat sink 20. The screw hole 35 overlaps with the through screw hole 24 of the heat radiating plate 20 on a coaxial line when the frame 30, the circuit component 10, and the heat radiating plate 20 are positioned. One screw S inserted from the back side into the through screw hole 24 of the heat radiating plate 20 is screwed into the screw hole 35.
Note that a cover (not shown) is placed on the surface side of the frame 30.

  A connector 40 is attached to the back side of the opening 21 of the heat sink 20. As shown in FIG. 2, the connector 40 is obtained by attaching a terminal fitting 41 to a housing body 42 made of synthetic resin. The housing main body 42 has a slightly horizontally long block shape, and is open to the back. A plurality of terminal insertion holes 43 through which the terminal fittings 41 are inserted are formed in the ceiling wall 42A. The terminal insertion hole 43 is provided corresponding to the through hole 14 of the circuit structure 10.

  The terminal fitting 41 is formed into an elongated rectangular bar shape as a whole by pressing a metal plate. Each terminal fitting 41 is held by the housing main body 42 in such a posture that one end protrudes into the opening of the housing main body 42 and the other end protrudes from the ceiling wall 42A to the front side. The end portions of the terminal fittings 41 protruding from the ceiling wall 42A are inserted into the through holes 14 from the back side and are connected by soldering on the surface side thereof so as to be electrically connected to the control circuit.

  As shown in FIG. 2, a pair of mounting legs 44 are provided at the upper end of the housing body 42. The pair of mounting legs 44 are configured to rise upward from both end edges in the longitudinal direction of the housing main body 42 and project outward, respectively, and span the frame 30 across the lateral direction as a whole. It has become a length.

  The opening 21 of the heat sink 20 and the housing main body are formed by the surfaces of the mounting legs 44 facing each other and the surface of the housing main body 42 sandwiched between both surfaces (the surface facing the opening 21 of the heat sink 20). A window portion 45 communicating with the outside of 42 is formed. A liquid coating material (not shown) is poured into the opening 21 through the window 45, and the coating material prevents moisture due to condensation from entering through the through hole 14. Has been.

  A mounting plate 46 is provided at each of the projecting ends of the mounting legs 44. Each mounting plate 46 has a flat plate shape and is formed on the front edge of the mounting leg portion 44, that is, is provided so as to slightly protrude from the front edge of the mounting leg portion 44.

  Both mounting plates 46 are each provided with a through screw hole 49. Like the through screw hole 24 of the heat radiating plate 20, the through screw hole 49 is formed by penetrating each mounting plate 46 in the front and back direction (plate thickness direction) and in the horizontal direction (plate surface direction of the mounting plate 46). The cross-sectional shape is substantially the same as the through screw hole 24 of the heat sink 20. When the connector 40 is positioned, the through screw hole 49 overlaps with the through screw hole 24 of the heat radiating plate 20 and the screw hole 35 of the frame 30 on the same axis. One screw S inserted from the back side into the through screw hole 49 of the mounting plate 46 passes through the through screw hole 24 of the heat radiating plate 20 and is screwed into the screw hole 35 of the frame 30.

  In addition, protrusions 47 projecting from the front edge of the mounting leg portion 44 to the front side are provided at the ends of the pair of mounting leg portions 44 facing each other. Each protrusion 47 has a hemispherical shape, and its protruding end reaches the same position as the surface position of the mounting plate 46. The connector 40 is mounted in a state where only the front surfaces of both mounting plates 46 and the projecting ends of the protrusions 47 are in contact with the rear surface of the heat sink 20 locally and the housing body 42 is separated from the back of the heat sink 20. ing.

  A first boss 33A, a second boss 33B, and a third boss 33C are provided on the back surface of the frame 30 so as to protrude toward the back. Among these, the 2nd boss | hub 33B and the 3rd boss | hub 33C correspond to the convex part for positioning in this invention. FIG. 3 is an exploded perspective view showing a state in which the electrical junction box in the present embodiment is assembled, and FIG. 4 is a rear view of the electrical junction box in the present embodiment.

  As shown in FIG. 3, the second boss 33 </ b> B is provided on the side frame portion on the opposite side to the insulating rib 31 side in the both side frame portions on the long side of the frame body 30. The second boss 33B is arranged side by side with the screw hole 35 at the end of the side frame corresponding to the through hole 14 (the right side in FIG. 3), in other words, at the end where the connector 40 is attached. Has been. The second boss has a height capable of penetrating through a positioning plate 15A, which will be described later, the heat radiating plate 20, and the mounting plate 46 of the connector 40 in the front and back direction (thickness direction of each member). . Further, the cross-sectional shape of the second boss 33 </ b> B in the horizontal direction (the surface direction of the circuit structure 10) is non-circular, and has a substantially rectangular shape that is elongated in the direction along the short direction of the frame 30.

  The third boss 33C is provided on the side frame portion on the opposite side (left side in FIG. 3) to the side on which the second boss 33B is provided in the lateral frame portions of the frame body 30 in the short direction. Is disposed at a position closer to the end opposite to the insulating rib 31 side (a diagonal position with respect to the second boss). The third boss 33C has a height capable of penetrating a positioning plate 15B and a heat radiating plate 20, which will be described later, in the front and back direction (thickness direction), and is lower than the second boss 33B. The cross section of the third boss 33C in the horizontal direction (the surface direction of the circuit component 10) has a circular shape.

  33 A of 1st boss | hubs are provided in the side frame part facing the side frame part in which the 2nd boss | hub is provided in the edge part by which the connector 40 in the frame 30 is attached. The first boss 33A is arranged side by side in the screw hole 35 and has a positional relationship slightly shifted in the longitudinal direction from the second boss 33. The first boss 33A has substantially the same height as the second boss 33B. A positioning plate 15A, which will be described later, the heat radiating plate 20, and the mounting plate 46 of the connector 40 are arranged in the front-back direction (the thickness of each member In the vertical direction). And the cross-sectional shape of the horizontal direction (surface direction of the circuit structure 10) in the 1st boss | hub 33A is non-circular, and has comprised the substantially rectangular shape close | similar to a square.

  In the peripheral part of each boss 33A, 33B, 33C on the back surface of the frame body 30, there are formed relief recesses 34 that are formed in a substantially rectangular shape and are recessed in the outward direction substantially by the thickness of the bus bar 13. A part of a positioning plate 15 described later can be fitted into the escape recess 34.

  Positioning plates 15 </ b> A and 15 </ b> B made of the same material as the bus bar 13 are affixed to the back surface of the circuit board 11 while being electrically separated from the bus bar 13. The positioning plates 15A and 15B are formed by simultaneously punching the same metal plate on which the bus bar 13 is formed in the same punching process. Further, the positioning plates 15A and 15B are attached to the circuit board 11 in the same process by the same adhesive sheet to which the bus bar 13 is attached.

  The positioning plate 15A is affixed to an end portion on the through hole 14 side in the longitudinal direction of the circuit board 11, and an area corresponding to the plurality of through holes 14 is opened, and the through hole 14 is directed to the back side through the openings. I'm here. On the other hand, the positioning plate 15B is affixed to an end portion opposite to the positioning plate 15A side, and is disposed at a corner portion on the opposite side to the bus bar extending portion 13A side at the opposite end portion.

  The positioning plate 15A has a configuration in which portions corresponding to the first boss 33A and the second boss 33B of the frame body 30 extend in the horizontal direction (the plate surface direction of the circuit board 11) from the edge of the circuit board 11, Further, the positioning plate 15B has a configuration in which a portion corresponding to the third boss 33C similarly extends from the edge of the circuit board 11. The portions extending from the circuit board 11 each have a substantially rectangular shape that can be fitted into the relief recess 34 of the frame body 30, and are sandwiched between the frame body 30 and the heat radiating plate 20. The portions extending from the circuit board 11 include a first through hole 16A corresponding to the first boss 33A, a second through hole 16B corresponding to the second boss 33B, and a third corresponding to the third boss 33C. A through hole 16C is provided through each extending portion in the front and back direction (thickness direction). Among these, the 2nd through-hole 16B and the 3rd through-hole 16C correspond to the through-hole in this invention.

  The cross-sectional shape of the second through-hole 16B is an elongated rectangular shape substantially along the outer shape of the second boss 33B, and the cross-sectional shape of the third through-hole 16C is a circle substantially along the outer shape of the third boss 33C. It has a shape. And the clearance of the horizontal direction (surface direction of the circuit structure 10) between the 2nd boss | hub 33B, the 2nd through-hole 16B, and the 3rd boss | hub 33C and the 3rd through-hole 16C is made very small, respectively. It can be fitted with no gap. Thereby, positioning with the frame 30 and the circuit structure 10 is made with high precision.

  The cross-sectional shape of the first through hole 16A is formed in a rectangular shape close to a square with a slight margin with respect to the outer shape of the first boss 33A, and the horizontal clearance between the second boss 33B and the second through hole 16B or larger than the horizontal clearance between the third boss 33C and the third through hole 16C. Thereby, it is prevented that it becomes difficult to fit due to a molding error of the first boss 33A and a processing error of the first through hole 16A.

  In this way, the bosses 33A, 33B, and 33C penetrate the through holes 16A, 16B, and 16C, and the circuit component 10 and the frame 30 are positioned in the horizontal direction (the surface direction of the circuit component 10).

  At positions corresponding to the first boss 33A, the second boss 33B, and the third boss 33C of the frame 30 in the heat radiating plate 20, a first fitting hole 23A, a second fitting hole 23B, and a third fitting hole 23C, respectively. Is provided. Among these, the 2nd fitting hole 23B and the 3rd fitting hole 23C correspond to the recessed part for positioning in this invention.

  Each fitting hole 23A, 23B, 23C is provided through the heat sink 20 in the front and back direction (plate thickness direction), and is arranged coaxially with each boss 33A, 33B, 33C and each through hole 16A, 16B, 16C. ing.

  The first fitting hole 23A, the second fitting hole 23B, and the third fitting hole 23C have substantially the same shape as the first through hole 16A, the second through hole 16B, and the third through hole 16C of the circuit structure 10, respectively. There is no. Then, the second boss 33B and the second fitting hole 23B and the third boss 33C and the third fitting hole 23C are fitted with almost no gap, and the positioning of the heat sink 20 and the frame body 30 is performed with high accuracy. . Further, the horizontal clearance between the first boss 33A and the first fitting hole 23A has a slight margin, and is caused by the molding error of the first boss 33A and the first fitting hole 23A. It is prevented that assembly is difficult.

  Thus, the first fitting hole 23A, the second fitting hole 23B, and the third fitting hole 23C pass through the first boss 33A, the second boss 33B, and the third boss 33C, respectively, and the heat sink 20 is a frame body. The back surface of 30 and the back surface of the circuit structure 10 are positioned with respect to the horizontal direction. In addition, the tip portions of the first boss 33 </ b> A and the second boss 33 </ b> B protrude rearward from the back surface of the heat sink 20.

As shown in FIG. 4, the pair of mounting plates 46 of the connector 40 are provided with a first mounting hole 48A and a second mounting hole 48B that can be fitted to the first boss 33A and the second boss 33B, respectively. Among these, the 2nd attachment hole 48B corresponds to the fitting part in this invention.
Each mounting hole 48A, 48B is provided in parallel with each through screw hole 49, and is formed through each mounting plate 46 in the front and back direction (plate thickness direction).

  The first mounting hole 48A has a cross-sectional shape substantially along the outer shape of the first boss 33A. Unlike the first through hole 16A of the circuit component 10 and the first fitting hole 23A of the heat sink 20, The horizontal clearance with the boss 33A is very small. Thus, the first mounting hole 48A and the first boss 33A are fitted with almost no gap.

  The second mounting hole 48B has substantially the same shape as the second through hole 16B of the circuit component 10 and the second fitting hole 23B of the heat sink 20, and similarly, the second mounting hole 48B is fitted to the second boss 33B with almost no gap. The

  Thus, the first mounting hole 48A and the second mounting hole 48B are fitted through the front ends of the first boss 33A and the second boss 33B protruding rearward from the heat radiating plate 20 with no gap therebetween, and the connector 40 is radiated. The back surface of the plate 20 is positioned with high accuracy.

  Thus, in the three members of the frame 30, the circuit component 10, and the heat sink 20, the second through hole 16B and the second fitting hole 23B are fitted to the second boss 33B, respectively, and the third boss 33C is fitted. On the other hand, the third through hole 16C and the third fitting hole 23C are fitted to each other so that positioning is performed at two locations. The connector 40 is positioned at both ends by fitting the first mounting hole 48A to the first boss 33A and fitting the second mounting hole 48B to the second boss 33B. Yes. Here, the second boss 33B also serves to position the frame 30, the circuit component 10, and the heat sink 20, and the positioning means for the second boss 33B constitutes positioning means for positioning the four members. Yes. The positioning means for the third boss 33 </ b> B constitutes positioning means for positioning the three members excluding the connector 40.

Next, a method for manufacturing the aforementioned electrical junction box will be described.
The electrical junction box manufacturing method includes an installation step of installing the frame body 30 in a posture in which the protruding directions of the bosses 33A, 33B, and 33C are directed upward, and the through holes 16A and 16B in the bosses 33A, 33B, and 33C. , 16C through the first positioning step of stacking the circuit component 10 from above the frame 30, and the heat sink 20 through the bosses 33A, 33B, 33C through the fitting holes 23A, 23B, 23C. A second positioning step for stacking the structure 10 from above, and a third positioning step for placing the connector 40 on the heat sink 20 from above while penetrating the mounting holes 48A, 48B at the tip portions of the bosses 33A, 33B, 33C. And a fixing step of fixing the circuit component 10, the heat sink 20, the frame 30, and the connector 40.

Hereinafter, this process will be described step by step.
(1) Installation Step of Frame 30 First, as shown in FIG. 3, the back surface of the frame 30 (the surface on which the bosses 33A, 33B, and 33C are projected) is directed upward and the frame 30 is substantially The frame body 30 is installed in a posture in which the protruding ends of the bosses 33A, 33B, and 33C face upward so as to be in a horizontal state. Next, the sealing material 36 is applied to a portion where the circuit component 10 overlaps on the rear surface of the frame 30 (the surface facing the upper side in the installed state).

(2) First Positioning Step Next, the circuit component 10 is positioned with respect to the frame body 30.
First, the back surface of the circuit structure 10 (the surface on which the bus bar 13 is disposed) is directed upward (the electrical component 12 is at the lower side), and the first through hole 16A and the second through hole of the positioning plate 15A. The circuit component 10 is aligned so that the hole 16B and the third through hole 16C of the positioning plate 15B correspond to the first boss 33A, the second boss 33B, and the third boss 33C of the frame 30, respectively. Then, the circuit component 10 is gradually approached to the frame 30 from above, and the through holes 16A, 16B, 16C are passed through the bosses 33A, 33B, 33C. Then, the second through hole 16B and the third through hole 16C are fitted into the second boss 33B and the third boss 33C with almost no gap. Further, since there is a relatively large clearance between the first through hole 16A and the first boss 33A, the first through hole 16A penetrates smoothly, and the frame 30 even if some molding error occurs in these. There is no obstacle in the positioning operation between the circuit structure 10 and the circuit structure 10. When the circuit component 10 is overlapped on the back surface of the frame body 30, the sealing material 36 disposed on the back surface of the frame body 30 enters the gap between the bus bar 13 and the positioning plates 15A and 15B and the frame body 30, Seal the gap. In addition, the portions of the positioning plates 15A and 15B where the through holes 16A, 16B, and 16C are provided are in a state of being fitted into the recesses 34. And the circuit structure 10 is overlaid on the back surface of the frame 30 in a state of being positioned with high accuracy by fitting the second through hole 16B and the second boss 33B and the third through hole 16C and the third boss 33C. The positioning is performed with respect to the horizontal direction (the surface direction of the circuit structure 10).

(3) 2nd positioning process Next, the heat sink 20 is accumulated on the back surface of the circuit structure 10, and it positions.
First, an adhesive is applied to the surface of the heat radiating plate 20 (the surface to be bonded to the circuit component 10), and this surface is directed downward, and the opening 21 is connected to the through hole 14 side of the circuit component 10. Orient the heat sink 20 so that Next, the first fitting hole 23A, the second fitting hole 23B, and the third fitting hole 23C of the frame body 30 projecting upward through the through holes 16A, 16B, 16C of the circuit component 10, respectively. The heat radiating plate 20 is positioned so as to correspond to the first boss 33A, the second boss 33B, and the third boss 33C, and is brought close to the circuit component 10 from above. And each fitting hole 23A, 23B, 23C is penetrated to each boss | hub 33A, 33B, 33C. Then, the second fitting hole 23B and the third fitting hole 23C are fitted into the second boss 33B and the third boss 33C with almost no gap. Further, since there is a sufficient clearance between the first fitting hole 23A and the first boss 33A, these penetrate smoothly. Then, when the heat sink 20 is overlapped on the back surface of the circuit structure 10 from above, the through hole 14 of the circuit structure 10 faces upward via the opening 21 of the heat sink 20. Further, the screw holes 35 of the frame 30 and the through screw holes 24 of the heat sink 20 are arranged coaxially. Thus, the heat radiating plate 20 is positioned on the back surface of the circuit component 10 in a state of being positioned with high accuracy by fitting the second fitting hole 23B and the second boss 33B, and the third fitting hole 23C and the third boss 33C. Overlaid via adhesive. At this time, the tip ends of the first boss 33A and the second boss 33B protrude upward from the back surface of the heat sink 20. Note that the third boss 33 </ b> C does not protrude from the third fitting hole 23 </ b> C of the heat radiating plate 20 to the back side, and is in a substantially retracted state.

(4) 3rd positioning process Next, the connector 40 is mounted in the back surface of the heat sink 20, and it positions.
First, the mounting leg portion 44 of the connector 40 is set in a downward orientation, and the first mounting hole 48A and the second mounting hole 48B are protruded upward from the back surface of the heat sink 20, respectively. The connector 40 is aligned so as to correspond to the two bosses 33B. When the connector 40 is brought close to the heat sink 20 and the mounting holes 48A and 48B are passed through the bosses 33A and 33B, the mounting holes 48A and 48B are fitted into the bosses 33A and 33B with almost no gap. . Thus, the connector 40 is positioned at both ends (positions of the mounting holes 48A and 48B) and placed on the back surface of the heat sink 20. At this time, the through screw holes 49 of the connector 40 are connected to the screw holes 35 of the frame 30 and the through screw holes 24 of the heat sink 20 in a coaxial line (see FIG. 2). Further, the housing main body 42 of the connector 40 faces the through hole 14 of the circuit component 10 through the opening 21 of the heat sink 20, and the terminal fitting 41 is inserted into the through hole 14. In this way, the connector 40 is placed on the back surface of the heat sink 20 in a state of being accurately positioned by fitting the mounting holes 48A and 48B with the bosses 33A and 33B of the frame body 30.

(5) Fixing process Next, the positioning work of the frame body 30, the circuit structure 10, the heat sink 20, and the connector 40 which were positioned is performed.
First, a screw S is inserted from above into the through screw hole 49 of the mounting plate 46 of the connector 40 and the through screw hole 24 disposed in the portion of the heat sink 20 where the connector 40 is not overlapped, and is connected coaxially. The through screw holes 24 and 49 are threaded into the screw holes 35 of the frame body. Thereby, the connector 40, the heat sink 20, and the frame 30 or the heat sink 20 and the frame 30 are penetrated by one screw S and fixed at each location. At this time, the circuit component 10 that is sandwiched and positioned between the heat sink 20 and the frame 30 is also fixed.
In addition, before mounting the connector 40 on the back surface of the heat sink 20, the heat sink 20 and the frame body 30 may be partially screwed at a portion where the connector 40 is not disposed.

  As described above, according to the present embodiment, the three members, that is, the frame body 30, the circuit component 10, and the heat radiating plate 20, are positioned at two locations by the positioning means provided at two locations. Here, when it is necessary to provide a positioning means for every two members as in the prior art, when trying to position each member at two locations as in the present embodiment, Positioning means must be provided in at least four places, two places each. However, in this embodiment, since the three members can be positioned by the positioning means provided at one place, it is only necessary to provide the positioning means at two places, that is, the positioning means is half that of the prior art. Since it only needs to be provided at the location, the degree of freedom in design is increased and the space for the positioning structure can be saved.

  Moreover, the electrical connection box of this embodiment is provided with a connector 40, and the connector 40 is positioned at two locations. That is, in this embodiment, the four members obtained by adding the connector 40 to the frame 30, the circuit structure 10, and the heat sink 20 are positioned at two positions respectively by positioning means provided at a total of three positions. Here, when it is necessary to provide positioning means for each member as in the prior art, it is necessary to provide at least six positioning means in total when positioning each of the four members at two locations. However, in the present embodiment, since the positioning means is only half of the three positions, the space for the positioning structure can be saved. In particular, the electrical junction box is generally used by being stored in a narrow space, and thus it is very effective to increase the degree of freedom of design and to save space.

  In addition, the horizontal cross-sectional shape of the second boss 33B, the second through hole 16B, the second fitting hole 23B, and the second mounting hole 48B has a horizontally long shape, and by the positioning means according to the second boss 33B, The circuit component 10, the frame 30, the heat sink 20, and the connector 40 are positioned in a state in which they are unlikely to be displaced from each other in the rotational direction. The cross-sectional shapes of the first boss 33A and the first mounting hole 48B are also slightly horizontally long, and the connector 40 is positioned with high accuracy at both ends.

  In addition, since the horizontal cross-sectional shapes of the third boss 33C, the third through hole 16C, and the third fitting hole 23C are circular, the positioning means according to the third boss 33C includes the circuit component 10. The frame 30 and the heat radiating plate 20 are positioned in a state where they can be displaced from each other in the rotational direction. As a result, even if a slight molding error occurs in the positioning means related to the second boss 33B, the error is adjusted by shifting the respective members in the rotational direction in the positioning means related to the third boss 33C. Therefore, it is difficult to fit the positioning means due to the molding error, and it is possible to avoid the deterioration of the assembling workability, and the electric junction box can be assembled without any problem.

  Moreover, since each through-hole 16A, 16B, 16C of the circuit structure 10 is formed in the positioning plates 15A, 15B electrically separated from the bus bar 13, a circuit is provided at each through-hole 16A, 16B, 16C position. It is possible to reliably prevent electrical leakage between the structure 10 and the heat sink 20. Further, since the positioning plates 15A and 15B are made of the same material as the bus bar 13, they can be formed in the same process as the bus bar 13 and attached to the back surface of the circuit board 11 in the same process.

  Further, when assembling the electrical junction box, the frame 30 provided with the first boss 33A, the second boss 33B, and the third boss 33C is installed with the bosses 33A, 33B, 33C facing upward. Thereafter, the circuit component 10 is overlapped from above while passing through the first through hole 16A, the second through hole 16B, and the third through hole 16C through the bosses 33A, 33B, and 33C, and then the bosses 33A, 33B, and 33C are The heat sink 20 is stacked from above while passing through the first fitting hole 23A, the second fitting hole 23B, and the third fitting hole 23C. Then, the connector 40 is mounted on the back surface of the heat radiating plate 20 while penetrating the first mounting holes 48A and the second mounting holes 48B through the tip ends of the first boss 33A and the second boss 33B protruding upward from the heat radiating plate 20, respectively. By positioning, the four members of the circuit component 10, the heat sink 20, the frame 30, and the connector 40 can be positioned simultaneously. As described above, since the four members can be positioned by simply stacking the circuit component 10, the heat sink 20, the frame 30, and the connector 40 from above, the work flow is good.

  In addition, since the four members including the circuit component 10 are fixed by fixing the heat radiating plate 20, the frame body 30, and the connector 40 after positioning as described above, the workability related to the assembly can be improved. .

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) In the above embodiment, the heat sink 20 having a plate shape as the heat radiating member is bonded to the back surface of the circuit component 10, but the heat radiating member does not necessarily have to have a plate shape. The member may be provided with a plurality of fins.

  (2) In the above embodiment, the positioning plates 15A and 15B are attached to the back surface of the circuit board 11 separately from the bus bar 13, and the positioning plates 15A and 15B are provided with the through holes 16A, 16B and 16C, respectively. However, it is not always necessary to do this. For example, the through hole may be passed through a circuit board, a bus bar, or a portion where the circuit board and the bus bar overlap.

  (3) In the above embodiment, the three members of the frame body 30, the circuit component 10, and the heat sink 20 are positioned by positioning means provided at two locations, and the positioning accuracy is improved, but this is not limitative. Instead, the positioning may be performed only by positioning means provided at one place.

  (4) In the above-described embodiment, the positioning means according to the second boss 33B and the third boss 33C has a horizontal cross-sectional shape of a rectangular shape and a circular shape. Both of the cross-sectional shapes may be horizontally long or circular.

  (5) In the said embodiment, although the connector 40 is provided in the back side of the heat sink 20, it is not restricted to this, The connector may be provided in the front side of the frame. At this time, the positioning convex portion according to the present invention may be provided on the heat radiating plate side, the positioning concave portion may be provided on the frame body, and the tip portion of the convex portion may protrude from the concave portion of the frame body to the front side.

  (6) In the above embodiment, the connector 40 is positioned by the mounting holes 48A and 48B that can be fitted to the bosses 33A and 33B of the frame 30, but the connector 40 is positioned by a positioning means provided separately. You may do it. In this case, since the positioning recess (second fitting hole 23B of the heat sink 20 in the above embodiment) according to the present invention only needs to be able to be fitted to the protrusion, the member as in the above embodiment. It does not have to be in the form of penetrating through.

  (7) In the above embodiment, the horizontal cross-sectional shape of the second boss 33B is substantially rectangular, and it is difficult to shift in the rotational direction at this position, but in order to make it difficult to shift in the rotational direction. The cross-sectional shape may be any shape as long as it is non-circular, for example, it may be triangular.

External perspective view of electrical junction box in this embodiment Side sectional view of the electrical junction box in the present embodiment The exploded perspective view which shows a mode that the electric junction box in this embodiment is assembled | attached. Rear view of electrical junction box in this embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Circuit structure 11 ... Circuit board 13 ... Bus-bar 15A, 15B ... Positioning plate 16B ... 2nd through-hole (through-hole)
16C ... 3rd through-hole (through-hole)
20 ... Radiating plate 23B ... Second fitting hole (concave for positioning)
23C ... Third fitting hole (concave for positioning)
30 ... Frame (one member)
33B ... 2nd boss (convex part for positioning)
33C ... Third boss (positioning convex part)
40 ... Connector 48B ... Second mounting hole (fitting part)

Claims (7)

Between a circuit structure formed by stacking bus bars on an insulating circuit board, a heat dissipation member superimposed on one surface of the circuit structure, and the heat dissipation member disposed on the other surface of the circuit structure A frame body fixed to the heat dissipation member with the circuit structure sandwiched therebetween, and positioning means for positioning the circuit structure body, the heat dissipation member and the frame body in a surface direction of the circuit structure body. An electrical junction box with
The positioning means includes a through-hole provided in a portion sandwiched between the heat dissipation member and the frame body in the circuit structure body and penetrating the circuit structure body in a thickness direction, and the heat dissipation member and the frame body. A positioning convex portion provided on one of them and penetrating the through hole, and a positioning concave portion provided on the other of the heat radiating member and the frame and fitted on the convex portion. An electrical junction box characterized by that. The electrical connection box according to claim 1, wherein the through hole of the positioning means is formed in a positioning plate made of the same material as the bus bar in the circuit structure. 3. The electrical junction box according to claim 1, wherein a shape of a cross section of the convex portion, the concave portion, and the through hole in a surface direction of the circuit configuration body is a non-circular shape. The positioning means is provided at a plurality of locations, and the cross-sectional shape of the convex portion, the concave portion, and the through-hole in the surface direction of the circuit constituent body according to at least one positioning means is circular. The electrical junction box according to any one of claims 1 to 3, wherein the electrical junction box is characterized. A connector is attached to the other of the heat dissipation member provided with the recess and the other side of the frame body from the side opposite to the side where the circuit component is disposed,
The concave portion is configured to penetrate the other of the heat dissipation member and the frame body in the protruding direction of the convex portion,
The convex portion penetrates the concave portion, and its tip protrudes from the other of the heat radiating member and the frame to the side opposite to the side where the circuit component is disposed,
The electrical connection box according to any one of claims 1 to 4, wherein the positioning means includes a fitting portion that is provided on the connector and can be fitted to a tip portion of the convex portion. Between a circuit structure formed by stacking bus bars on an insulating circuit board, a heat dissipation member superimposed on one surface of the circuit structure, and the heat dissipation member disposed on the other surface of the circuit structure A frame body fixed to the heat dissipation member with the circuit structure sandwiched therebetween, and positioning means for positioning the circuit structure body, the heat dissipation member and the frame body in a surface direction of the circuit structure body. Prepared,
The positioning means includes a through-hole provided in a portion sandwiched between the heat dissipation member and the frame body in the circuit structure body and penetrating the circuit structure body in a thickness direction, and the heat dissipation member and the frame body. A positioning convex portion provided on one of them and penetrating the through hole, and a positioning concave portion provided on the other of the heat radiating member and the frame and fitted on the convex portion. A method of manufacturing an electrical junction box,
An installation step of installing one of the heat dissipation member and the frame body provided with the convex portion in a posture in which the protruding direction of the convex portion is directed upward;
A first positioning step of overlapping the circuit component from above one of the heat radiating member and the frame while penetrating the through hole in the convex portion;
A second positioning step in which the other of the heat dissipating member and the frame body provided with the concave portion is overlapped from the upper side of the circuit configuration body while the concave portion is fitted to the tip portion of the convex portion;
A method of manufacturing an electrical junction box, comprising: a fixing step of fixing the heat radiating member and the frame body in a state where the circuit component is sandwiched between the heat radiating member and the frame body. Between a circuit structure formed by stacking bus bars on an insulating circuit board, a heat dissipation member superimposed on one surface of the circuit structure, and the heat dissipation member disposed on the other surface of the circuit structure A frame that is fixed to the heat dissipation member with the circuit structure sandwiched therebetween, a connector that is attached to the heat dissipation member or the frame body from a side opposite to the side on which the circuit structure is disposed, and Positioning means for positioning the circuit component, the heat radiating member, the frame, and the connector in the surface direction of the circuit component;
The positioning means includes a through-hole provided in a portion sandwiched between the heat dissipation member and the frame body in the circuit structure body and penetrating the circuit structure body in a thickness direction, and the heat dissipation member and the frame body. One of the through holes, the heat radiating member, and the other of the frame body can be penetrated, and the tip portion thereof is arranged from the other of the heat radiating member and the frame body. A positioning convex portion that protrudes to the opposite side of the side, and a positioning concave portion that is provided on the other of the heat dissipating member and the frame body so that the convex portion can pass therethrough. A fitting portion provided in the connector and capable of being fitted to a tip portion of the convex portion, and a method of manufacturing an electrical junction box,
An installation step of installing one of the heat dissipation member and the frame body provided with the convex portion in a posture in which the protruding direction of the convex portion is directed upward;
A first positioning step of overlapping the circuit component from above one of the heat radiating member and the frame while penetrating the through hole in the convex portion;
A second positioning step in which the other of the heat dissipating member and the frame body provided with the recess is overlapped from above the circuit component while passing the recess through the protrusion;
A third positioning step of placing the connector on the other of the heat radiating member and the frame body from above while fitting the fitting portion to the tip of the convex portion;
And a fixing step of fixing the heat radiating member, the frame and the connector in a state where the circuit component is sandwiched between the heat radiating member and the frame. Method.

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