JP2012115052A - Electric connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connection box in a new structure, which allows a soldered part of a connection terminal covered with a bus bar to be viewed with more excellent visibility while securing the heat dissipation of the bus bar, in the electric connection box provided with the connection terminal and the bus bar on a printed board.SOLUTION: A bus bar 26 including an upper wall part 34 covering the upper part of connection terminals 28, 30, 32 and a rear wall part 36 covering the rear part is disposed on an insulating plate 20. Also, while an external terminal 50a is formed at an end edge part 48 on the side of the upper wall part 34, a flat plate part 38 bent from the lower end of the rear wall part 36 and extended onto the insulating plate 20 is formed, a peep hole 64 is formed in a through-hole shape at an end edge part on the side of the flat plate part 38 at the rear wall part 36, and a soldered part 114 of the connection terminals 28, 30, 32 covered with the bus bar 26 is made visible through the peep hole 64.

Description

  The present invention relates to an electrical junction box provided with a printed circuit board, and more particularly to an electrical junction box in which electrical components are connected to a connection terminal provided on the printed circuit board and an external terminal of a bus bar from the side of the printed circuit board. is there.

  2. Description of the Related Art Conventionally, an electrical connection box is known in which connection terminals and bus bars provided on a printed circuit board can be connected to external electrical components such as fuses and relays. In such an electrical junction box, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2009-153319 (Patent Document 1), a connection terminal or an external terminal for connecting to an external electrical component in a bus bar is provided. There is one that protrudes to the side of the printed circuit board.

  In such an electrical junction box, as shown in FIG. 3 of Patent Document 1, the connection terminals and bus bars are bent in an L shape so that electrical components can be connected from the side of the printed circuit board. Has been. And since the bus bar is put on the upper side of the connection terminal, the soldered portion of the connection terminal to the printed circuit board may be difficult to visually recognize.

  In view of this, the present applicant disclosed in Japanese Patent Application Laid-Open No. 2008-193773 (Patent Document 2) an electric connection box in which a window portion is provided in a bus bar so that a soldered portion of a connection terminal can be visually recognized through the window portion. Proposed.

  However, in the structure described in Patent Document 2, the bus bar has a window portion formed at the leading end protruding from the printed circuit board, and the distance between the window portion and the soldering portion is large. In some cases, it was difficult to visually recognize the portion. In addition, the portion where the external terminal is formed in the bus bar is likely to become high temperature due to energization. Therefore, when the window portion is formed in the vicinity of the external terminal, the surface area of the proximity portion of the external terminal is reduced, which may reduce the heat dissipation effect of the bus bar.

JP 2009-153319 A JP 2008-193773 A

  The present invention has been made in the background of the above-mentioned circumstances, and the solution to the problem is that in the electric connection box in which the connection terminals and the bus bar are provided on the printed circuit board, while ensuring the heat dissipation of the bus bar, It is an object of the present invention to provide an electrical junction box having a novel structure capable of visually recognizing a soldered portion of a covered connection terminal with better visibility.

  In the first aspect of the present invention, a side connection part for connecting an electrical component from the side to the printed circuit board is provided, and a plurality of connection terminals are soldered to the printed circuit board at each one end. A bus bar having an upper wall portion covering the upper side of the plurality of connection terminals and a rear wall portion covering the rear side is provided on the printed circuit board while each other end portion is disposed in the side connection portion. In the electrical connection box disposed on the insulating plate placed on the side wall, the external terminal is formed on the edge portion on the side of the upper wall portion of the bus bar and disposed in the side connection portion, A flat plate portion that is bent from the lower end of the rear wall portion of the bus bar and extends on the insulating plate is formed, and a viewing window is formed in a through hole shape at an edge portion of the rear wall portion on the flat plate portion side. And the pre-connection of the connection terminal covered with the bus bar. That soldered portions of the bets substrate is visible through the viewing window, characterized.

  According to the present invention, the bus bar that covers the connection terminal is bent at the boundary portion between the upper wall portion and the rear wall portion, and has a crank shape that is bent at the boundary portion between the rear wall portion and the flat plate portion. A viewing window is provided at the edge of the rear wall portion on the flat plate portion side. Thereby, in the bus bar, a viewing window is formed at the base end portion rising from the flat plate portion, and the viewing window is positioned as close as possible to the soldering portion of the connection terminal. As a result, the soldered portion of the connection terminal can be visually recognized with good visibility through the viewing window.

  Further, the viewing window is formed at the bent portion distal to the external terminal at two bent portions of the crank-shaped bus bar. As a result, in the bent portion proximal to the external terminal that is likely to become high temperature due to energization, the surface of the bus bar is sufficiently secured without forming a viewing window, and the heat from the external terminal is cooled to reduce the thermal effect. By forming the viewing window at the bent portion, excellent visibility can be obtained while ensuring a sufficient heat dissipation effect.

  The viewing window is formed with a through-hole shape. The through-hole shape in the present invention means that an intermediate portion between the edge portions of the bus bar penetrates and the outer periphery is surrounded by the metal plate of the bus bar over the entire circumference without being opened to the edge portion of the bus bar. The hole shape. Thereby, ensuring the strength of the bus bar is also achieved efficiently. That is, the lower end edge portion of the rear wall portion is ensured with high strength at the flat plate portion, so that it is possible to avoid a significant decrease in strength of the bus bar even if a viewing window is formed. Moreover, since the observation window is formed in the shape of the through-hole instead of the notch shape opened at the edge of the bus bar, the strength reduction of the bus bar due to the formation of the observation window can be more effectively suppressed.

  According to a second aspect of the present invention, in the one described in the first aspect, the insulating plate is formed with a vertical wall portion rising from a support portion that supports the flat plate portion, and the vertical wall portion is In addition to being disposed between a rear wall portion and the connection terminal, a communication portion is provided through the vertical wall portion, and the soldering portion is visible through the observation window and the communication portion. It is what.

  According to this aspect, even when the insulating plate is interposed between the rear wall portion of the bus bar and the connection terminal, the soldered portion of the connection terminal can be visually recognized through the communication portion of the insulating plate and the observation window of the bus bar. In addition, the communication part formed in an insulating board is not limited to the through-hole shape enclosed by the substance of the insulating board over the perimeter of the outer periphery, The notch shape open | released at the edge part of the insulating board Etc.

  According to a third aspect of the present invention, in the first or second aspect, the insulating plate is integrally formed with a support pedestal that supports the side connection portion with respect to the printed circuit board. In addition, an insertion opening through which the plurality of connection terminals are inserted is provided between the support pedestal and the support, and the soldering portion is visible through the viewing window and the insertion opening. It is what is said.

  According to this aspect, the side connection portion can be more stably supported with respect to the printed board using the insulating plate. And the insertion opening part has a large opening through which the plurality of connection terminals can be inserted. Thereby, the soldering part of a connection terminal can be easily visually recognized through an insertion opening part and the observation window of a bus bar.

  According to a fourth aspect of the present invention, in the one described in any one of the first to third aspects, the viewing window is formed with a through hole shape straddling the rear wall portion and the flat plate portion, Positioning protrusions formed on the support portion of the insulating plate are fitted into through-hole portions in the flat plate portion of the viewing window.

  According to this aspect, the flat plate portion of the bus bar can be positioned on the support portion of the insulating plate by fitting the positioning protrusion of the insulating plate and the through hole of the flat plate portion of the bus bar. Thereby, the observation window of the bus bar can be used as a positioning mechanism on the insulating plate.

  According to the present invention, the bus bar having the upper wall portion covering the upper side of the plurality of connection terminals soldered to the printed circuit board and the rear wall portion covering the rear is disposed on the insulating plate, and the upper wall portion of the bus bar. While forming the external terminal at the edge of the side wall, it forms a flat plate part that bends from the lower end of the rear wall part and extends on the insulating plate, and penetrates the viewing window through the edge part of the rear wall part on the flat plate part side It was formed with a hole shape, and the soldering portion of the connection terminal covered with the bus bar was made visible through the viewing window. As a result, the viewing window can be positioned close to the soldering portion, and excellent visibility can be obtained. As a result, it is possible to improve the solder quality by shortening the visual time of the soldering portion and making the soldering portion visible when adjusting the solder state. Furthermore, by forming a viewing window in a portion of the bus bar away from the external terminal and securing a surface area of the portion close to the external terminal, the viewing window can be formed while ensuring a sufficient heat dissipation effect of the bus bar. I can do it.

The disassembled perspective view of the electrical-connection box as one Embodiment of this invention. The perspective view of the principal part of the printed circuit board shown in FIG. III-III sectional drawing in FIG. FIG. 3 is an exploded perspective view of the fuse module shown in FIG. 2. The perspective view of the bus-bar shown in FIG. The rear view of the insulating board shown in FIG. The top view of the insulating board shown in FIG. The perspective view of the connecting terminal shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, FIG. 1 shows an exploded perspective view of an electrical junction box 10 as an embodiment of the present invention. The electrical junction box 10 has a structure in which a printed circuit board 16 constituting an internal circuit is accommodated between an upper case 12 and a lower case 14 made of synthetic resin. In the following description, unless otherwise specified, “upper” means the upper case 12 side, and “lower” means the lower case 14 side.

  2 and 3 show the main part of the printed circuit board 16. A fuse module 18 is provided at one end of the printed circuit board 16. As conventionally known, various electrical components (not shown) such as relays and connectors are mounted on the printed circuit board 16 together with the fuse module 18. As shown in FIG. 4, the fuse module 18 includes an insulating plate 20, a fuse base 22, a fuse case 24, a bus bar 26, a plurality of first output terminals 28 as connection terminals, an input terminal 30, and a second output. A terminal 32 is included.

  FIG. 5 shows the bus bar 26. The bus bar 26 is formed of a metal plate such as copper punched by press working. Note that the bus bar 26 of the present embodiment is configured by two bus bars 26a and 26b that are separated from each other. However, in the following description, when there is no need to distinguish between the two, the 2 One bus bar 26 will be described as one bus bar 26a and 26b.

  The bus bar 26 has a crank shape, an upper wall portion 34 having a substantially flat plate shape, a rear wall portion 36 that is bent perpendicularly from the upper wall portion 34 and extends downward perpendicularly to the upper wall portion 34, A flat plate portion 38 that is bent perpendicularly from the lower end of the rear wall portion 36 and extends perpendicularly to the rear wall portion 36 is provided. As a result, the first bent portion 40 is formed at the boundary portion between the upper wall portion 34 and the rear wall portion 36, while the second bent portion 42 is formed at the boundary portion between the rear wall portion 36 and the flat plate portion 38. Has been. An upper wall portion 34 and a flat plate portion 38 are extended from the upper and lower end edge portions of the rear wall portion 36 to the opposite sides perpendicular to the rear wall portion 36.

  A tab-shaped power connection terminal 44 and a plurality of (four in the present embodiment) fusible links (hereinafter referred to as FL) connections smaller than the power connection terminal 44 are connected to the flat plate portion 38. Terminals 46 are respectively cut and raised to be integrally formed.

  On the other hand, a plurality of tuning fork terminals 50a as external terminals are integrally formed in parallel on the end edge portion 48 on the upper wall portion 34 side. The tuning fork terminals 50a have the same shape. The tuning fork terminal 50a has a base portion 52 that protrudes from the end edge portion 48 and a pair of press contact blades 54 and 54 that protrude further from the base portion 52 and are spaced apart from each other. Then, a tab-shaped connection terminal of a fuse (not shown) is press-fitted between the press contact blades 54, 54. Further, engagement notches 56 and 56 are formed at both ends of the base portion 52 in the width direction. The engagement notches 56 of one base portion 52 adjacent in the parallel direction and the engagement notches 56 of the other base portion 52 are formed. Are opposed to each other.

  A plurality of connection terminal portions 60 that are connected to the printed circuit board 16 are integrally formed on the edge portion 58 on the flat plate portion 38 side. Each connection terminal portion 60 is bent substantially perpendicularly at the end edge portion 58, and is a projecting piece that extends vertically downward with respect to the flat plate portion 38. Further, a plurality of locking pieces 62 are integrally formed on the end edge 58. The locking piece portion 62 is a protruding piece that has a projecting dimension smaller than that of the connection terminal portion 60 and extends in the same direction as the connection terminal portion 60.

  In the bus bar 26, a plurality of (a total of three viewing windows 64, one for the bus bar 26 a and two for the bus bar 26 b) are provided in the second bent portion 42 which is a boundary portion between the rear wall portion 36 and the flat plate portion 38. Is formed. The viewing window 64 is formed with a substantially rectangular through-hole shape that penetrates the metal plate constituting the bus bar 26 in the thickness direction. Thereby, the outer periphery of the observation window 64 is surrounded by the metal plate which is the substantial part of the bus bar 26 over the entire periphery. In particular, the viewing window 64 in the present embodiment has a through-hole shape straddling the rear wall portion 36 and the flat plate portion 38, and is formed at the edge portion of the rear wall portion 36 on the flat plate portion 38 side. 38 is also formed with a through-hole shape at the edge on the rear wall 36 side. Such a viewing window 64 is formed, for example, after a substantially rectangular through hole straddling the second bent portion 42 is punched out by pressing or the like on the metal plate before the second bent portion 42 is bent. The two bent portions 42 are bent to form a through hole shape straddling the rear wall portion 36 and the flat plate portion 38.

  In addition, the magnitude | size of the observation window 64 is not specifically limited, A width dimension (dimension of the extension direction of the 2nd bending part 42) and a height dimension (from the 2nd bending part 42 toward the 1st bending part 40) Any of the directions (vertical dimensions) can be set arbitrarily. The height dimension of the observation window 64 may be set to 1/2 or less, more preferably 1/3 or less of the height dimension of the rear wall part 36 in order to ensure the strength of the rear wall part 36. preferable.

  On the other hand, a plurality of (four in total, one for the bus bar 26a and three for the bus bar 26b) are formed in the first bent portion 40 so as to penetrate therethrough. The lightening hole 66 has a rectangular through-hole shape that is sufficiently smaller than the observation window 64, and reduces the cross-sectional area at the first bent portion 40 to such an extent that the heat dissipation effect of the bus bar 26 is not impaired. The bending portion 40 can be easily bent with a small force.

  Such a bus bar 26 is placed on the insulating plate 20. 6 and 7 show the insulating plate 20. The insulating plate 20 is an integrally molded product formed from a non-conductive synthetic resin. A flat support 68 is formed on the insulating plate 20. The support portion 68 is formed with an insertion hole 70 through which the connection terminal portion 60 of the bus bar 26 is inserted and a locking recess 72 into which the locking protrusion 62 is inserted. In addition, a vertical wall portion 74 that rises perpendicular to the support portion 68 is formed at one end edge portion of the support portion 68. In the support portion 68, a peripheral wall 76 protrudes from the outer peripheral edge portion excluding the vertical wall portion 74.

  In the vertical wall portion 74, a communication portion 78 is formed at a position overlapping the viewing window 64 of the bus bar 26. As shown in FIGS. 3 and 6, the communication portion 78 has a rectangular shape having a size substantially equal to the viewing window 64 in the rear wall portion 36 of the bus bar 26 and is formed through the vertical wall portion 74. Further, as shown in FIG. 7, a positioning projection 80 is formed at a portion where the communication portion 78 is formed in the end edge portion of the support portion 68 on the vertical wall portion 74 side. The positioning projection 80 protrudes upward from the support portion 68 and has a U-shape opening in the vertical wall portion 74 side in a plan view, and has the same width dimension as the communication portion 78 (the lateral dimension in FIG. 7). The rib shape extends along the edge of the support portion 68.

  A terminal insertion portion 82 is integrally formed at the protruding edge portion of the vertical wall portion 74 from the support portion 68. As shown in FIGS. 3 and 7, the terminal insertion portion 82 has a bottom plate portion 84 (see FIG. 3) that extends in the width direction of the insulating plate 20 (the left-right direction in FIG. 7). In the bottom plate portion 84, a plurality of first insertion holes 86 and a plurality of second insertion holes 88 are formed side by side in the width direction of the insulating plate 20, and the first insertion holes 86 and the second insertion holes 88 are formed. They are formed side by side in a direction orthogonal to the width direction of the insulating plate 20 (left and right direction in FIG. 3). Such a terminal insertion portion 82 is formed above the communication portion 78 so as to be supported by the vertical wall portion 74.

  Further, a support pedestal 90 is integrally formed on the insulating plate 20 on the opposite side of the support portion 68 with the terminal insertion portion 82 sandwiched in plan view (see FIG. 7). A plurality of third insertion holes 92 are provided in the support base 90, and the plurality of third insertion holes 92 are aligned in a straight line in the width direction of the insulating plate 20 (left and right direction in FIG. 6). Is formed. The first insertion hole 86, the second insertion hole 88, and the third insertion hole 92 in the terminal insertion portion 82 are orthogonal to the width direction of the insulating plate 20 in plan view (see FIG. 6). (Up and down direction) are formed in a straight line. Further, a plurality of support pins 94 are formed in parallel on the support base 90 so as to be positioned closer to the edge of the insulating plate 20 than the third insertion hole 92. The support pin 94 has a substantially square bar shape protruding upward from the support base 90. The support pins 94 are positioned between the third insertion holes 92 in the width direction of the insulating plate 20.

  The support pedestal 90 is connected to the support portion 68 by a pair of connecting ribs 95, 95 extending from both edges in the width direction of the support portion 68. Thereby, between the support part 68 and the support base 90, it is enclosed by these support parts 68, the support base 90, and a pair of connecting ribs 95 and 95, and the insertion opening part which penetrates the insulating board 20 to an up-down direction 96 is formed. The insertion opening 96 is a through hole that extends over substantially the entire width of the insulating plate 20 in the width direction (the left-right direction in FIG. 6). The terminal insertion portion 82 is positioned above the insertion opening 96. Further, the terminal insertion portion 82 is connected to the support base 90 by a vertical connection rib 97 at the end opposite to the vertical wall portion 74. Thereby, at both ends in the longitudinal direction of the insulating plate 20, a lighting window 99 that is surrounded by the support portion 68, the support pedestal 90, the connecting rib 95, and the terminal insertion portion 82 and opened to the outside in the longitudinal direction is formed. .

  On the other hand, as shown in FIGS. 3 and 4, the fuse pedestal 22 has a longitudinal block shape made of a non-conductive synthetic resin and having a width dimension substantially equal to that of the insulating plate 20. A plurality of support protrusions 98 are formed in parallel on the upper surface of the fuse base 22. A support protrusion 98 is inserted between adjacent bases 52 and 52 (see FIG. 5) of the tuning fork terminals 50a and 50a arranged in parallel with the bus bar 26, and is engaged with the respective engagement notches 56 and 56, thereby the fuse ( It is possible to support the tuning fork terminals 50a and 50a during press-fitting (not shown).

  Further, the fuse pedestal 22 has a plurality of first insertion holes 100, second insertion holes 102, and third insertion holes 104 that penetrate the fuse pedestal 22 in the front-rear direction (left-right direction in FIG. 3). 22 are formed side by side in the longitudinal direction. These first to third insertion holes 100, 102, 104 are formed in three stages in the vertical direction, and are arranged in the order of the first insertion hole 100, the second insertion hole 102, and the third insertion hole 104 from above. . Although not shown, the fuse pedestal 22 is formed with a plurality of insertion holes through which the support pins 94 formed in the insulating plate 20 are extended in the vertical direction.

  The fuse case 24 is made of a nonconductive synthetic resin. In the fuse case 24, a plurality of fuse accommodating portions 106 as side connection portions are formed in two rows in the vertical direction and in parallel in the longitudinal direction of the fuse case 24. The fuse housing portion 106 is a substantially rectangular recess, and an input terminal insertion hole 108 and an output terminal insertion hole 110 that penetrate the bottom wall portion 107 in the front-rear direction (left-right direction in FIG. 3) are provided in the fuse housing portion 106. It is formed at both upper and lower ends.

  The first output terminal 28, the input terminal 30, and the second output terminal 32 have substantially the same shape. In FIG. 8, the first output terminal 28, the input terminal 30, and the second output terminal 32 are punched from a metal plate such as copper and bent at a right angle, as shown by way of example of the first output terminal 28. It is made into a shape. Tuning fork terminals 50b to 50d having substantially the same shape as the tuning fork terminal 50a of the bus bar 26 are formed at one end of the first output terminal 28, the input terminal 30, and the second output terminal 32, respectively. At the end, a soldering portion 114 is formed which is inserted into the through hole 112 of the printed circuit board 16 and soldered. Further, in the first output terminal 28, the input terminal 30, and the second output terminal 32, notched concave portions 115, 115 are formed at both ends in the width direction at the base end portions of the tuning fork terminals 50 b to 50 d. .

  When assembling the fuse module 18, first, the second output terminal 32 is inserted into the lowermost third insertion hole 104 of the fuse base 22 from the tuning fork terminal 50 d side, and then the second insertion hole 102. Similarly, the input terminal 30 and the first output terminal 28 are similarly inserted into the first insertion hole 100. Next, the fuse pedestal 22 into which the terminals 28, 30, and 32 are inserted is superposed on the support pedestal 90 of the insulating plate 20, and each support pin 94 protruding from the support pedestal 90 is not shown in the fuse pedestal 22. The fuse base 22 is assembled to the insulating plate 20 by being inserted into the insertion hole. Thereby, the soldering portion 114 of the first output terminal 28 is inserted into the first insertion hole 86 and the insertion opening 96 of the terminal insertion portion 82 and protrudes below the insulating plate 20, and the solder of the input terminal 30. Similarly, the attaching portion 114 is inserted into the second insertion hole 88 and the insertion opening 96 and protrudes below the insulating plate 20. In particular, in the present embodiment, all the first output terminals 28 and the input terminals 30 inserted through the fuse base 22 are inserted through the insertion openings 96. Further, the soldering portion 114 of the second output terminal 32 is inserted into the third insertion hole 92 (see FIG. 7) of the support base 90 in the insulating plate 20 and protrudes below the insulating plate 20.

  Although detailed illustration is omitted, the support pins 94 of the insulating plate 20 are inserted into the fuse base 22 by assembling the fuse base 22 to the insulating plate 20. The support pins 94 are inserted into the recesses 115 of the second output terminal 32, the input terminal 30, and the first output terminal 28 that are arranged side by side in the vertical direction, and are adjacent in the longitudinal direction of the fuse base 22. The pair of second output terminals 32 and 32, the input terminals 30 and 30, and the first output terminals 28 and 28 are inserted into the recesses 115 and 115, respectively. Thus, the first output terminal 28, the input terminal 30, and the second output terminal 32 can be supported when a fuse (not shown) is press-fitted.

  Subsequently, the bus bar 26 is overlapped on the upper surfaces of the insulating plate 20 and the fuse base 22. Accordingly, the flat plate portion 38 of the bus bar 26 is overlapped with the support portion 68 of the insulating plate 20, and the connection terminal portion 60 protruding from the flat plate portion 38 is inserted into the insertion hole 70 of the support portion 68 and below the insulating plate 20. Protruding. Further, the upper wall portion 34 of the bus bar 26 is overlaid on the upper surface of the fuse base 22.

  Then, the fuse case 24 is overlaid on the front surface 116 of the fuse pedestal 22, and lock frames 118 (see FIG. 4) formed on both ends of the fuse case 24 and lock claws 120 formed on both ends of the fuse pedestal 22 are provided. Engage with each other. Thus, the tuning fork terminal 50a of the bus bar 26 protruding from the front surface 116 of the fuse base 22 and the tuning fork terminal 50b of the first output terminal 28 are inserted into the input terminal insertion hole 108 and the output terminal insertion of the upper fuse accommodating portion 106a. The holes 110 are inserted through the holes 110 so as to face each other in the fuse accommodating portion 106a. Similarly, the tuning fork terminal 50c of the input terminal 30 and the tuning fork terminal 50d of the second output terminal 32 projecting from the front surface 116 of the fuse base 22 are inserted into the input terminal insertion hole 108 and the output terminal insertion of the lower fuse housing portion 106b. The holes 110 are inserted through the holes 110 so as to face each other in the fuse accommodating portion 106b. In this manner, the insulating module 20, the fuse base 22, the fuse case 24, the bus bar 26, the input terminal 30, the first and second output terminals 28 and 32 are assembled with each other to form the integrated fuse module 18. Is done.

  In the fuse module 18, the flat plate portion 38 of the bus bar 26 is overlapped with the support portion 68 of the insulating plate 20 in an assembled state to the insulating plate 20. Then, the rear wall portion 36 of the bus bar 26 is overlapped with the vertical wall portion 74 of the insulating plate 20, and the observation window 64 formed in the rear wall portion 36 is overlapped with the communication portion 78 formed in the vertical wall portion 74. Communicated. Further, the flat plate portion 38 of the bus bar 26 is surrounded by a peripheral wall 76 and a vertical wall portion 74 formed at the peripheral edge portion of the support portion 68 while the locking piece portion 62 enters the locking recess 72 of the support portion 68. Thus, the positioning is performed on the support portion 68. Further, the positioning projection 80 of the support portion 68 is fitted into the through hole of the viewing window 64 formed in the flat plate portion 38. Thereby, the flat plate portion 38 is positioned more accurately on the support portion 68, and the alignment between the observation window 64 formed in the rear wall portion 36 and the communication portion 78 formed in the vertical wall portion 74 is also achieved. This is easier and more reliable.

  Such a fuse module 18 is placed on one side end of the printed circuit board 16. When the fuse module 18 is placed on the printed circuit board 16, the connection terminal portion 60 of the bus bar 26 protruding from the insulating plate 20, and the soldering portions 114 of the first output terminal 28, the input terminal 30, and the second output terminal 32. Are respectively inserted into through holes 112 penetrating the printed circuit board 16. And the screw cylinder part 122 provided in the longitudinal direction both ends of the fuse base 22 is screwed. Further, the connection terminal portion 60 of the bus bar 26 inserted through the through hole 112 and the soldering portions 114 of the terminals 28, 30 and 32 are mounted on the same surface as the fuse module 18 on the printed circuit board 16, such as a relay (not shown). For example, it is soldered together with the electric parts by flow soldering or the like. In this way, the fuse module 18 is disposed and fixed to the side of the printed circuit board 16, and the bus bar 26, the first output terminal 28, the input terminal 30, and the second output terminal 32 are provided on the printed circuit board 16. It is electrically connected to the printed wiring (not shown).

  As shown in FIG. 3, the insulating plate 20 is placed on the printed circuit board 16 via a plurality of legs 123 that are formed to protrude downward at appropriate positions. Thereby, the support part 68 is spaced apart and located above the printed circuit board 16. The flat plate portion 38 of the bus bar 26 is supported by the support portion 68. Further, the fuse base 22 is assembled to the support base 90 of the insulating plate 20, and the fuse case 24 is assembled to the fuse base 22, so that the fuse housing portion 106 formed in the fuse case 24 by the support base 90 is printed circuit board. 16 is supported.

  Further, in a fixed state to the printed circuit board 16, the input terminal 30, the first and second output terminals 28 and 32 are in an area surrounded by the printed circuit board 16, the upper wall portion 34 and the rear wall portion 36 of the bus bar 26. It is arranged. As a result, the upper side of the input terminal 30, the first and second output terminals 28, 32 is covered with the upper wall part 34, and the rear side opposite to the protruding direction of the tuning fork terminals 50 b to 50 d is covered with the rear wall part 36. Is called. Further, a vertical wall portion 74 of the insulating plate 20 is interposed between the rear wall portion 36 and the first output terminal 28 to ensure mutual insulation.

  Further, as shown in FIG. 2, a fusible link (hereinafter referred to as “FL”) terminal 124 that is soldered to the printed circuit board 16 in a state where the fuse module 18 is mounted on the printed circuit board 16 is connected to the insulating plate 20. This is inserted into the insertion hole penetrating the support portion 68 and the punching hole formed around the FL connection terminal 46 before being cut and raised in the flat plate portion 38 of the bus bar 26, and protrudes on the support portion 68. Thereby, the FL connection terminal 46 of the bus bar 26 and the FL terminal 124 projecting from the printed circuit board 16 are opposed to each other on the support portion 68 so that a fusible link (not shown) can be connected.

  The printed circuit board 16 having such a structure is accommodated between the upper case 12 and the lower case 14, and the upper case 12 and the lower case 14 are assembled to each other, whereby the electrical junction box 10 is configured. The fuse case 24 of the fuse module 20 is disposed in the side openings 126 a and 126 b of both cases 12 and 14 in a state of being accommodated in both cases 12 and 14. As a result, the fuse housing portion 106 of the fuse case 24 is opened to the side of the electrical junction box 10, and an unillustrated fuse as an electrical component can be inserted into each fuse housing portion 106 from the side of the printed circuit board 16. It is said that. Then, the connection terminal of the fuse inserted into the fuse housing portion 106a is press-fitted into the tuning fork terminal 50a of the bus bar 26 and the tuning fork terminal 50b of the first output terminal 28, and is inserted into the fuse housing portion 106b. The connection terminals of the fuses are press-fitted into and connected to the tuning fork terminal 50c of the input terminal 30 and the tuning fork terminal 50d of the second output terminal 32.

  According to the electrical junction box 10 in the present embodiment, the soldering portions 114 of the input terminal 30 and the first and second output terminals 28 and 32 covered by the upper wall portion 34 and the rear wall portion 36 of the bus bar 26 are provided on the rear side. It can be visually recognized from the outside through the observation window 64 penetrating the wall 36, the communication part 78 penetrating the insulating plate 20, and the insertion opening 96 provided in the insulating plate 20. In particular, since the observation window 64 and the communication portion 78 are formed at the proximal end portion protruding from the flat plate portion 38 of the rear wall portion 36 and are close to the soldering portion 114, each solder has excellent visibility. The attaching part 114 can be made visible.

  Further, the insertion opening 96 is a large opening through which the plurality of first output terminals 28 and the input terminals 30 are inserted, and a sufficient opening space is formed around the first output terminal 28 and the input terminals 30. . That is, for example, when the formation portion of the insertion opening 96 is plate-shaped and only the insertion holes for inserting the plurality of first output terminals 28 and the input terminals 30 one by one are formed, each terminal Since the resin material of the insulating plate 20 exists around the 28, 30 and 32 and the line of sight is blocked, it is difficult to visually recognize the soldered portion 114. On the other hand, according to the present embodiment, the large insertion opening 96 is formed so that the soldered portions 114 of the terminals 28, 30, and 32 are visually recognized with good visibility through the insertion opening 96. It is possible. Furthermore, by providing the terminal insertion portion 82 above the insertion opening 96, the positioning accuracy of the first output terminal 28 and the input terminal 30 with respect to the insulating plate 20 is ensured. In particular, since the terminal insertion portion 82 is formed above the viewing window 64 and the communication portion 78, the positioning accuracy of the first output terminal 28 and the input terminal 30 is improved while ensuring the visibility of the soldering portion 114. It is possible to secure. Furthermore, since both sides in the longitudinal direction of the insulating plate 20 are formed and opened with the daylighting windows 99, a larger amount of light is taken into the position closer to the center in the longitudinal direction of the insulating plate 20 through the daylighting windows 99. The soldering portion 114 can be visually recognized more easily.

  The bus bar 26 has a crank shape having a first bent portion 40 and a second bent portion 42, and a viewing window 64 is formed in the second bent portion 42 distal from the tuning fork terminal 50a. As a result, the first bent portion 40 proximal to the tuning-fork-shaped terminal 50a has a sufficient surface area to ensure heat dissipation, and a viewing window 64 is formed in the second bent portion 42 that is less affected by heat. Can be ensured. Further, since the observation window 64 is formed in the second bent portion 42, the bending of the second bent portion 42 can be easily performed with a small force.

  Furthermore, since the viewing window 64 is formed at the edge of the rear wall portion 36 on the flat plate portion 38 side, the strength of the bus bar 26 can be secured by the flat plate portion 38. Further, the observation window 64 is formed with a through-hole shape, and the outer periphery of the observation window 64 is surrounded by the metal plate of the bus bar 26 over the entire periphery. As a result, for example, the observation window 64 has a cutout shape that opens to the edge of the bus bar 26, and the strength of the bus bar 26 is prevented from being reduced. The soldering portion 114 is secured while ensuring the strength of the bus bar 26. Can be ensured.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the specific shape of the bus bar is not limited to that of the above embodiment, and the external terminal connected to the electrical component is not limited to the tuning fork terminal to which the fuse as in the embodiment is connected, A tab-shaped terminal or the like to which the connector is connected may be used, and the connection terminal portion 60 in the embodiment is not necessarily required, and the bus bar may not be soldered to the printed board.

  The shape of the viewing window is not limited to a rectangle, and various shapes such as a circle including an ellipse and other polygonal shapes can be appropriately employed. And when forming the communicating part which overlaps with a viewing window in an insulating plate, the specific shape of a communicating part can also be changed suitably, and it does not necessarily need to be made into the similar shape corresponding to a viewing window. Further, in the present invention, the vertical wall portion of the insulating plate and the communication portion formed on the insulating plate are not necessarily required. For example, the insulating plate may be a flat plate and only the rear wall portion of the bus bar may protrude from the insulating plate. good.

10: electrical connection box, 16: printed circuit board, 20: insulating plate, 26: bus bar, 28: first output terminal (connection terminal), 30: input terminal (connection terminal), 32: second output terminal (connection terminal) , 34: upper wall portion, 36: rear wall portion, 38: flat plate portion, 48: edge portion (upper wall portion side), 50: tuning fork terminal (external terminal), 64: viewing window, 68: support portion, 74: vertical wall portion, 78: communication portion, 80: positioning protrusion, 90: support base, 96: insertion opening portion, 106: fuse housing portion (side connection portion), 114: soldering portion

Claims (4)

Side connection portions for connecting electrical components from the side to the printed circuit board are provided, and a plurality of connection terminals are soldered to the printed circuit board at each one end, and the other end is connected to the other end. A bus bar having an upper wall portion covering the upper side of the plurality of connection terminals and a rear wall portion covering the rear is disposed on the insulating plate placed on the printed circuit board while being disposed in the side connection portion. In the electrical connection box in which an external terminal is formed at an end edge portion on the upper wall portion side of the bus bar and disposed in the side connection portion,
A flat plate portion that is bent from the lower end of the rear wall portion of the bus bar and extends on the insulating plate is formed, and a viewing window is formed in a through hole shape at an edge portion of the rear wall portion on the flat plate portion side. An electrical connection box, wherein a soldered portion of the connection terminal covered with the bus bar to the printed circuit board is visible through the viewing window. The insulating plate is formed with a vertical wall portion that rises from a support portion that supports the flat plate portion, the vertical wall portion is disposed between the rear wall portion and the connection terminal, and the vertical wall The electrical connection box according to claim 1, wherein a communication part is provided through the part, and the soldering part is visible through the observation window and the communication part. The insulating plate is integrally formed with a support pedestal that supports the side connection portion with respect to the printed circuit board, and a plurality of the connection terminals are inserted between the support pedestal and the support portion. The electrical connection box according to claim 1, wherein an insertion opening portion is formed, and the soldering portion is visible through the viewing window and the insertion opening portion. The viewing window is formed with a through-hole shape straddling the rear wall portion and the flat plate portion, and a positioning projection formed on the support portion of the insulating plate is fitted into the through-hole portion in the flat plate portion of the viewing window. The electrical junction box according to any one of claims 1 to 3, wherein the electrical junction box is placed.

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