JP5432833B2 - Distribution board component mounting structure - Google Patents

Description

  The present invention relates to a component mounting structure for a power distribution board in which electronic components and the like are mounted in a space-saving manner in a power distribution board accommodated in, for example, an electric junction box for automobiles.

  Conventionally, in order to mount large parts such as a plurality of terminals and relays on the surface of the distribution board and to mount small parts such as resistors, capacitors and diodes, various parts mounting structures for the distribution board have been proposed. .

  For example, in Patent Document 1, a plurality of L-shaped terminals having a plurality of relays mounted in parallel in the longitudinal direction of the board in the center in the width direction of the surface of the power distribution board and having a longitudinal intermediate portion fixed to the terminal holder. Each base end is soldered to both sides in the width direction of the surface of the distribution board, the terminal holder is fixed to the distribution board by screwing, and small parts such as resistors are mounted on the remaining part of the surface of the distribution board. The board assembly is configured, the distribution board assembly is housed in a cover made up of a main cover and a sub cover made of insulating resin, and the front end side of each clamping terminal on one side of the distribution board is housed in the housing of the main cover The fuse connection part is configured, the tip side of each tab terminal on the other side of the power distribution board is accommodated in each housing of the sub cover, the connector is configured, and the electrical connection box is configured by the power distribution board assembly and the cover It is described to do.

  Further, in Patent Document 2, the base end portions of a plurality of L-shaped terminals are respectively solder-connected to the three end portions of the power distribution board, and one terminal is accommodated in the housing to constitute a fuse connection portion. The other two terminals are housed in the housing to form a connector, the fuse connecting part is placed on the relay connected to the power distribution board, and the connector housing protrudes outward from the end of the power distribution board. It has been described that.

Japanese Patent Laying-Open No. 2008-295261 (FIG. 1) JP 2006-6079 A (FIGS. 1 and 3)

  However, in the conventional component mounting structure of the power distribution board, for example, as shown in FIG. 8, the power distribution board 29 has a configuration in which the base ends of the terminals are connected to both sides 30 and 31 in the width direction of the power distribution board 29. In order to form a local flow solder portion around each terminal insertion hole 62 on both sides in the width direction of the back surface of the substrate, portions 30 and 31 surrounded by a chain line in FIG. In particular, the number of small components such as resistors, capacitors, and diodes that can be mounted is reduced. To prevent this, the power distribution board 29 is enlarged, and the cover that accommodates the wiring board assembly is also enlarged.

The present invention is capable of downsizing the power distribution board as long view of the above, the mounting number of parts can be increased such as resistors and capacitors, diodes, etc. on the power distribution board, or mounted in the same quantity It aims at providing the component mounting structure of a power distribution board.

In order to achieve the above object, the component mounting structure for a power distribution board according to claim 1 of the present invention is provided with a plurality of rows of terminal insertion holes in the center in the width direction of the power distribution board, on both sides of the power distribution board in the width direction. One and the other L-shaped terminals are arranged toward each other, the bases of the one and the other terminals are inserted into the terminal insertion holes, and the distribution board is combined with the one and the other terminals. The housing is provided on one and the other side of the cover and spaced apart from the power distribution board in the board thickness direction, and the electrical contact portions of the one and the other terminals are on both sides in the width direction of the power distribution board. housed in the housing of the hand and the other, a gap for component placement is provided between the said one and / or the other of the housing of the rear face該配conductive substrate surface, in該配conductive substrate within the gap It is characterized by the parts being mounted.

With the above configuration, a plurality of rows of terminal insertion holes are provided not at both sides in the width direction of the distribution board but at the center in the width direction. The area of the solder region that connects the base of the penetrating terminal, that is, the component mounting prohibited region is reduced (because the overlapping of the solder regions on both sides is not necessary), and the component mountable region on the back surface of the board is expanded. In addition, in the gap between the rear surface of the housing and the surface of the distribution board, either the surface on either side of the distribution board in the width direction or one of the surfaces in the width direction is an area where components can be mounted. Electronic components such as diodes are mounted (surface mounted). Since the components are arranged in one or both of the distribution board in the width direction, that is, outside, the cooling performance (heat dissipation) of the components is enhanced. The combined type (divided type) cover includes, for example, a main cover and a sub cover. The components mounted on the surface of the power distribution board are accommodated in a gap between the back surface of the housing and the surface of the power distribution board.

Component mounting structure of the power distribution board according to claim 2, in the component mounting structure of the power distribution board as claimed in claim 1, wherein an end portion of the power distribution board into the slit provided in said cover, characterized in that the engagement.

With the above structure, the power distribution board in the cover of the slit Ru is positioned in engagement with the sliding.

  The component mounting structure for a power distribution board according to claim 3 is the component mounting structure for a power distribution board according to claim 1 or 2, wherein a gap for mounting the component is provided between the rear surface of the power distribution board and the back wall of the cover. Is formed.

  With the above configuration, the components mounted (mounted) on the back surface of the power distribution board are accommodated in a gap between the back surface of the power distribution board and the wall portion on the back side of the cover.

The distribution board component mounting structure according to claim 4 is the distribution board component mounting structure according to any one of claims 1 to 3, wherein a plate-like terminal holder for holding each of the one and the other terminals is the distribution board. A pair is arranged near the center of the substrate, and the components are arranged outside the terminal holder.

  With the above configuration, the base of each terminal is solder-connected to the circuit on the back surface of the central portion of the distribution board inside the pair of terminal holders, and the heat is generated even if the solder connection part generates heat during actual use of the distribution board. It is difficult to propagate to the parts on the board surface.

  The distribution board component mounting structure according to claim 5 is the distribution board component mounting structure according to any one of claims 1 to 4, wherein a tip of an electrical contact portion of each of the one and the other terminals is the distribution board. It is arranged within the width.

  With the above configuration, the housing of the cover that accommodates the electrical contact portion of the terminal is arranged so as not to protrude as far as possible from the end of the distribution board, the cover is downsized in the width direction, the terminal, the distribution board, each component, and the cover The electrical junction box is made compact in the width direction. By concentrating the terminal insertion hole at the center in the width direction of the power distribution board, even if the length of the electrical contact part of the terminal with the base inserted in the terminal insertion hole is set to a necessary and sufficient length, the tip of the terminal Located within the width dimension of the distribution board.

  According to the first aspect of the present invention, by providing each terminal insertion hole at the center in the width direction of the distribution board, compared to the case where each terminal insertion hole is provided on both sides in the width direction of the distribution board, By expanding the component mountable area, components can be mounted with high density. In addition, since the gap between the cover housing and the surface of the power distribution board is utilized as a component mounting space, components can be mounted with high density. As a result, the number of components mounted can be increased as compared to the conventional case, and the power distribution board and the cover that accommodates the power distribution board can be reduced in size if the number of parts mounted is the same. Moreover, the heat dissipation of a component can be improved by arrange | positioning components in the outer side of a power distribution board.

  According to the second aspect of the present invention, it is possible to securely form the gap for mounting components by fixing the power distribution board with the slit of the cover without misalignment.

  According to invention of Claim 3, many components can be efficiently mounted in the back surface of a power distribution board using the clearance gap between the wall part of the back side of a cover, and the back surface of a power distribution board.

  According to the fourth aspect of the present invention, the terminal holders block the heat generation of the solder connection portion at the center of the board, thereby preventing the heating of the parts on both sides of the board and preventing the malfunction of the parts due to the heating.

  According to the fifth aspect of the present invention, the case can be made compact in the width direction by preventing the position of the housing for accommodating the terminals from protruding outward from the power distribution board as much as possible.

It is a disassembled perspective view which shows one Embodiment of the electrical-connection box containing the components mounting structure of the power distribution board which concerns on this invention. It is a schematic front view which shows a power distribution board explanatory. It is a perspective view which shows one form of a power distribution board assembly formed by assembling terminals and the like on the power distribution board. It is a perspective view which shows one form of the undercover which assembles a power distribution board. It is a top view which similarly shows an undercover. It is a schematic sectional drawing which shows the state which mounted components between the housing of the undercover, and the power distribution board. It is a perspective view which shows one form of the electrical junction box which completed the assembly. It is a schematic front view which shows the conventional power distribution board explanatory.

  1 to 7 show an embodiment of a component mounting structure for a power distribution board according to the present invention.

  As shown in FIG. 1, in the power distribution board 1 of this embodiment, a plurality of types (a plurality of groups) of terminal insertion holes 4 to 10 are concentrated and provided in a plurality of rows in the central portion 3 in the width direction instead of the two sides 2a and 2b in the width direction. It has been. Since the power distribution board 1 of this example is used with the width direction set up vertically, it has an upper end 11 and a lower end 12 in the width direction, and has a left end 13 and a right end 14 in the longitudinal direction. The power distribution board 1 is made of an insulating resin, has a printed circuit (not shown) and an insulating film on the front and back surfaces 1a and 1b, and may have a thin plate-like metal core circuit (not shown) in the middle in the thickness direction. .

  The terminal insertion holes 4 to 10 are arranged in four rows along the substrate longitudinal direction. A plurality of large box-shaped relays 15 are provided in parallel in the vertical direction on the left end side of the distribution board 1, and are located near the right end 14 of the distribution board 1 and the right end of the relay 15 in the vicinity of the central portion 3 of the distribution board 1. In addition, a pair of upper and lower (left and right) screw insertion holes 20 for screwing and fixing the terminal holders 18 and 19 of the upper and lower terminal assemblies 16 and 17 are provided, and between the pair of left and right screw insertion holes 20 4, four rows of terminal insertion holes 4 to 10 are arranged.

  The bottom row terminal insertion holes 7 and 8 are provided on the left half side of the power distribution board 1, the small diameter terminal insertion holes 7 are arranged in parallel on the left half of the bottom row, and the medium diameter terminal insertion holes 8 are arranged on the right half. They are arranged in parallel. The terminal insertion holes 7 to 10 in the second row from the bottom are the terminal insertion holes 7 and 8 having the same size as the terminal insertion holes 7 and 8 in the lowermost row disposed on the left half side of the distribution board 1, and the distribution board 1 and large-diameter terminal insertion holes 9 and 10 arranged on the right half side. Base portions 21a to 24a of the L-shaped terminals 21 to 24 in the lower terminal assembly 16 are inserted (penetrated) into the terminal insertion holes 7 to 10 in the first row and the second row from the bottom.

  The third row of terminal insertion holes 4 to 6 are a large-diameter terminal insertion hole 4 arranged on the left half side of the distribution board 1 and a medium-diameter terminal insertion arranged on the right half side of the distribution board 1. It consists of holes 5 and 6. As with the third row from the bottom, the uppermost terminal insertion holes 4 to 6 are composed of a large-diameter terminal insertion hole 4 on the left half side and medium-diameter terminal insertion holes 5 and 6 on the right half side. Yes. Base portions 25a to 27a of the L-shaped terminals 25 to 27 in the upper terminal assembly 17 are inserted into the terminal insertion holes 4 to 6 in the third row and the uppermost row from the bottom. The four rows of terminal insertion holes 4 to 10 are arranged at an equal pitch P in the vertical direction. The terminal insertion holes in each row 4 to 10 are arranged at equal pitches in the left-right direction for each group (type).

  As shown in a schematic diagram of the power distribution board 1 in FIG. 2, the terminal insertion holes 4 to 10 are concentrated on the central portion 3 in the width direction of the power distribution board 1. The width W1 of the region 28 for forming the flow solder portion around the terminal insertion holes 4 to 10 on the back surface 1b of the distribution board 1 is equal to the width W2 of the two regions 30 and 31 of the conventional distribution board 29 of FIG. Compared to the sum, the size is reduced to about 2/3, and the component mountable area increases (when the size of each of the power distribution boards 1 and 29 in FIGS. 8 and 2 is the same). If the component mounting area is the same, the distribution board 1 can be made smaller than before.

  That is, in the component mounting prohibited area 28 in the center of the power distribution board 1 in FIG. 2, a part of the portion corresponding to the two upper and lower component mounting prohibited areas 30 and 31 of the conventional power distribution board 29 in FIG. 8 overlaps. Therefore, the component mounting prohibited area 28 is smaller than the total area of the two conventional component mounting prohibited areas 30 and 31. Since the four rows of terminal insertion holes 4 to 10 of the power distribution board 1 in FIG. 2 are arranged at equal pitches P in the vertical direction, the width of the component mounting prohibited area 28 is equal to the two component mounting prohibited areas 30 in FIG. , 31 is narrowed by the overlapping width of the portion corresponding to.

  In FIG. 1, each of the terminals 21 to 24 of the lower terminal assembly 16 includes a male terminal 21 having a pin-shaped horizontal base portion 21a in two upper and lower rows in the left end group and a second group from the left. A male terminal 22 having a pin-shaped horizontal base portion 22a with two middle diameters in the upper and lower rows, a male terminal 23 having a third row of large-diameter pin-shaped horizontal base portions 23a from the left, and a group at the right end And a male terminal 24 having a pin-shaped horizontal base 24a with a large diameter in one row. Each of the male terminals 21 and 22 in the first and second groups from the left has pin-like downward vertical electrical contact portions 21b and 22b in two front and rear rows, and each electrical contact portion 21b and 22b and each base portion. The male terminals 23, 24 at the third and right ends from the left have tab-like downward vertical electrical contact portions 23b, 24b, and the electrical contact portions 23b, 24b It continues to a plurality of parallel bases 23a, 24a.

  Each of the terminals 25 to 27 of the upper terminal assembly 17 includes a sandwiching terminal 25 having two large rows of pin-shaped horizontal bases 25a in the upper and lower rows of the left half group and a second (center) group from the left. A male terminal 26 having a pin-like horizontal base portion 26a with two upper and lower rows of medium diameters, and a male terminal 27 having a pin-like horizontal base portion 27a with two upper and lower rows in the right end group. . The left half group of clamping terminals 25 has vertical electric contact portions 25b that are formed of a pair of left and right clamping pieces in two front and rear rows, and the male terminals 26 and 27 in the second and rightmost groups from the left are , The pin-shaped upward vertical electrical contact portions 26b and 27b are arranged in two front and rear rows, and the base portions 25a to 27a of the terminals 25 to 27 of each group are in one-to-one correspondence to the respective electrical contact portions 25b to 27b. .

  The upper and lower terminals 21 to 27 are respectively fixed to terminal holders 18 and 19 made of insulating resin. That is, the intermediate portion of the vertical portion of each terminal 21 to 27 (in place of reference numerals 21b to 27b) is press-fitted and fixed in the holes of the horizontal plate portions 18a and 19a of the terminal holders 18 and 19. Each terminal holder 18, 19 has bosses 18 b, 19 b with tapped holes at the left and right ends of the plate parts 18 a, 19 a, and bolts (small screws) are passed through the screw insertion holes 20 from the back surface 1 b of the power distribution board 1. By screwing into each tap hole, each terminal holder 18, 19 is fixed to the surface 1 a of the power distribution board 1 as shown in FIG. 3.

  As shown in FIG. 3, the base end portions 21 a to 27 a of the terminals 21 to 27 are inserted (penetrated) into the terminal insertion holes 4 to 10 (FIG. 1) of the power distribution board 1, and the back surface 1 b of the power distribution board 1 is not shown. The solder is connected and fixed to a circuit (not shown) of the power distribution board 1. The tips of the electrical contact portions 21b to 27b of the upper and lower terminals 21 to 27 are located on the inner side without protruding outward from the upper and lower ends 11 and 12 of the power distribution board 1, and the upper and lower terminal holders 18 and 19 are located in parallel. doing. Terminal assemblies 16 and 17 are constituted by the terminals 21 to 27 and the terminal holders 18 and 19, and the distribution board assembly is constituted by the terminal assemblies 16 and 17, the distribution board 1 and each mounted component (relay 15 and small parts). 32 is configured.

  In FIG. 1, the vertical electrical contact portions 21 b to 24 b of the lower terminals 21 to 24 are accommodated in the respective housings 34 to 37 of the lower insulating resin undercover (sub cover or cover) 33. Configure each connector. As shown in FIG. 4, the under cover 33 is connected to the four housings 34 to 37 arranged in parallel in the left and right direction (substrate longitudinal direction) and the lower ends of the housings 34 to 37 in the left and right and front and rear directions. An extended horizontal lower wall portion 38, and standing on the lower wall 38, are lowered along the front and right sides of the two housings 36 and 37 on the right half side and the rear sides of the four housings 34 to 37. A bottom wall extension 40 comprising a frame wall 39, 39 ′ disposed and a vertical portion 40 a and a horizontal portion 40 b that are bent up from the lower wall 38 in a substantially L shape on the left side of the leftmost housing 34. A frame wall 41 that surrounds the bottom wall extension 40 following the rear (back) frame wall (wall) 39 ′ and reaches the front wall (substitute with reference numeral 34) of the leftmost housing 34; 38 and 42 for the stopper provided around the bottom wall extension 40 , In which and a locking projection 43 provided on the frame wall 39, 39 'and front wall 35, and the like.

  Each of the housings 34 to 37 accommodates the lower terminals 21 to 24 (FIG. 1), a connector fitting chamber for fitting a mating connector (not shown) from the opening of the lower wall 38, and a connector fitting. Front and rear peripheral walls surrounding the chamber (substitute with reference numerals 34 to 37), and an upper wall (bottom wall) 34b having rectangular or slit-shaped holes 34a to 37a for inserting the terminals 21 to 24 into the connector fitting chamber. To 37b. The under cover 33 can also be called a connector block.

  In this example, the vertical rear walls 34c and 35c forming the peripheral walls of the first and second housings 34 and 35 from the left are more than the rear walls 36c and 37c of the third and rightmost housings 36 and 37 from the left. A large gap (space) 44 shown in FIG. 5 is provided between the frame wall (wall portion) 39 ′ on the front side and the rear side (back side). As shown in FIG. 5, the left and right frame wall portions 39a are vertically provided with slits 45 in order to insert the power distribution board 1 in the vicinity of the rear frame wall 39 '.

  As shown in FIG. 5, with the distribution board 1 inserted into the slit 45, the surface (front surface) 1a of the distribution board 1 is in contact with the rear walls 36c and 37c of the first and second housings 36 and 37 from the right. A relatively large gap (space) 44 exists between the rear walls 34c and 35c of the first and second housings 34 and 35 from the left. As shown in a schematic diagram in FIG. 6, a component (electronic component) 46 such as a resistor, a capacitor, or a diode is mounted (surface mounted) on the surface 1 a of the power distribution board 1 using the gap 44.

FIG. 6 is a schematic cross-sectional view of the power distribution board assembly 32 shown in FIG. 3 with the under cover 33 attached and the power distribution board 1 viewed from the left direction. The power distribution board 1 is positioned between the housings 34 to 37 , and the base portions 21 a to 24 a of the L-shaped terminals 21 to 24 protruding from the upper walls 34 b to 37 b of the housings 34 to 37 are distributed via the terminal holder 18. A component 46 is disposed in a gap 44 on the power distribution board 1 between the terminal holder 18 and the lower walls 38 of the housings 34 and 35 by soldering to a circuit (not shown) on the back surface 1 b of the board 1.

  Components 46 and electronic relays 47 are also mounted (mounted) on the back surface 1 b of the power distribution board 1. The parts 46 and 47 on the back side are covered and protected by the rear wall 49 of the main cover (cover) 48 (FIG. 1) locked to the frame walls 39 and 39 ′ of the under cover 33. A gap 63 for mounting components between the frame wall 39 ′, which is the rear wall, and the rear surface 1b of the power distribution board 1, and between the rear wall (back wall portion) 49 of the main cover 48 and the rear surface 1b of the power distribution board 1, respectively. (FIGS. 5 and 6) are formed.

  The parts 46 and 47 on the back side are larger than conventional parts in a wide area portion (upper part mounting area is larger than the conventional example of FIG. 8) except for the central part 3 in the width direction of the power distribution board 1 in FIG. Can be installed. If the quantity of the parts 46 and 47 is the same, the power distribution board 1 can be reduced in size.

  A component 46 (FIG. 6) mounted on the surface 1 a of the lower portion 2 a of the power distribution board 1 in FIG. 2 is disposed between the rear walls 34 c and 35 c of the housings 34 and 35 in FIG. . In FIG. 5, the thicknesses of the first and second housings 36 and 37 from the right are reduced, and the rear walls 36c and 37c of the housings 36 and 37 are arranged behind the first and second housings 34 and 35 from the left. It is also possible to form a component mounting space 44 between the rear walls 34c to 47c of all four housings 34 to 37 and the power distribution board 1 by being positioned on the same plane as the walls 34c and 35c. In FIG. 5, the component 46 is also mounted on the surface 1 d of the power distribution board 1 on the left side of the leftmost housing 34.

  The under cover 33 in FIG. 6 is actually combined with the main cover 48 in a state where the power distribution board assembly 32 (FIG. 3) is accommodated in the main cover 48 as shown in FIG. The engaging protrusion 43 of the under cover 33 in FIG. 1 engages with the engaging holes 51 in the front and rear walls 49 and 50 of the main cover 48, and the stopper collar 42 (FIG. 4) is the lower end of the main cover 48. Abut. The slit 45 on the side wall 39 a of the under cover 33 in FIG. 5 is waterproofed by being housed inside the main cover 48.

  A component 46 is mounted on the surface 1a of the upper portion 2b of the power distribution board 1 in FIG. 2 as follows. That is, as shown in FIG. 1, the upper wall 52 of the main cover 48 is provided with three housings 53 to 55 in the left-right direction near the front wall 50, and the two housings 54, 55 on the right side are between the cover rear wall 49. The housing 53 on the left side (center of the upper wall 52) has a small gap 57 between the cover rear wall 49 and the upper portion 2b of the power distribution board 1 on the inner surface of the cover rear wall 49. A gap (space) 56 for component mounting is formed between the outer surface (rear surface or rear surface) of the right two housings 54, 55 and the front surface 1 a of the power distribution board 1. The outer surface (rear surface) is in contact with the front surface 1a of the power distribution board 1 and is positioned without a gap, or between the outer surface (rear surface or rear surface) of the left housing 53 and the front surface 1a of the power distribution board 1, a narrow gap for mounting components. (Space) It is made.

  Thus, by utilizing the space 56 on the back side of the housings 54 and 55, a component 46 (see FIG. 6) such as a resistor, a capacitor, or a diode is mounted (surface mounted) on the surface 1a of the upper portion 2b of the power distribution board 1. . As described above, the space 56 on the back side of the housings 54 and 55 of the main cover 48 is basically the same as the space 44 on the back side of the housings 34 and 35 of the under cover 33. Inside the left and right wall portions 58 of the main cover 48, vertical slits (grooves not shown) for guiding the upper both sides 13 and 14 of the power distribution board 1 are provided.

  The two housings 54, 55 on the right side of the main cover 48 accommodate the two terminal groups 26, 27 on the right side of the upper terminal assembly 17 to form a connector, and the left terminal group 25 in the left housing 53. Is housed to form a fuse connection. The left and right wall portions 58 of the main cover 48 are provided with rails 59 and locking projections 60 for slidingly fitting into a large electric connection box main body (relay box main body) (not shown). The small electrical connection box 61 in the assembled state of FIG. 7 functions as power integration for integrating power and distributing power.

  In the distribution board assembly 32 of FIG. 3, components 46 such as resistors, capacitors, and diodes are mounted on the top surface 1 a of the distribution board 1 except for the center and on the back surface 1 b of the distribution board 1 on the top and bottom except for the center. A plurality of electronic relays 47 (FIG. 6) are mounted in parallel in the left-right direction, and components 46 such as resistors, capacitors, and diodes are mounted around the electronic relay 47 (mainly outside).

  Since the mounted components 46 and 47 are concentrated not on the center (inside) of the distribution board 1 but on the upper and lower sides, that is, on the outer side of the distribution board 1, the heat of the parts 46 and 47 easily escapes to the outside. Is prevented. Further, since it is only necessary to perform flow soldering at only one central portion of the power distribution board 1, soldering is ensured, and the base portions 21a of the terminals 21 to 27 of the upper and lower terminal assemblies 16, 17 (FIG. 3). In a state in which ˜27a are all inserted into the respective terminal insertion holes 4 to 10 of the power distribution board 1, the terminal base portions 21a to 27a can be soldered once.

  In the above embodiment, the electrical connection box 61 is arranged vertically, and the vertical direction is defined. However, when the electrical connection box 61 is arranged horizontally, the vertical direction is the longitudinal direction. Needless to say.

  Moreover, in the said embodiment, the components 46 are arrange | positioned in the clearance gaps 44 and 56 between the housings 34, 35, 54, and 55 of each cover 33 and 48 and the power distribution board 1 in the width direction both sides 2a and 2b of the power distribution board 1. However, for example, the housing 34, 35 or 54, 55 of any cover 33 or 48 and the power distribution board only on one side (for example, the lower side 2a) in the width direction of the power distribution board 1 or only on the other side (for example, the upper side 2b). It is also effective to place the component 46 in the gap 44 or 56 between the two.

  In the above embodiment, the upper and lower terminal holders 18 and 19 are arranged in the vicinity of the central portion 3 of the power distribution board 1, and component mounting spaces are provided below the lower terminal holder 18 and above the upper terminal holder 19. 44 and 56 are divided to make it difficult for the heat of the solder portion of the substrate central portion 3 to be transmitted to the upper and lower components 46, and the base portions 21 a to 27 a of the terminals 21 to 27 are collectively connected to the terminal insertion holes of the distribution board 1. 4 to 10 are inserted, but the terminals 21 to 27 can be inserted into the terminal insertion holes 4 to 10 of the power distribution board 1 one by one without using the terminal holders 18 and 19.

  The power distribution board component mounting structure according to the present invention increases the component mounting area of the power distribution board, or downsizes the power distribution board and the cover for housing the power distribution board, for example, power integration accommodated in an electrical junction box for automobiles. It can be used for high-density mounting and miniaturization of electronic components such as (small electrical junction box) and similar junction blocks.

DESCRIPTION OF SYMBOLS 1 Power distribution board 1a Front surface 1b Back surface 2a, 2b Width direction both sides 3 Center part 4-10 Terminal insertion hole 18, 19 Terminal holder 21-27 Terminal 21a-27a Base 21b-27b Electric contact part 33 Under cover (cover)
34-37, 53-55 Housing 39 ', 49 Rear wall (back side wall)
44, 56 Clearance 45 Slit 46 Parts 48 Main cover (cover)
63 Clearance

Claims (5)

Terminal insertion holes are provided in a plurality of rows in the widthwise central portion of the power distribution board, it is arranged the terminals of one and the other L-shaped toward both sides in the width direction of the該配conductive substrate, the one and the other of the terminals The base is inserted into the terminal insertion hole, the power distribution board is housed in a united cover together with the one and the other terminals, and is separated from the power distribution board in the thickness direction of the board on one side and the other side of the cover. each housing is provided, said the one and the other of the housing to the hand and the other in each housing at both sides in the width direction of the該配conductive substrate electrical contact portions of the terminals, and the back side of the one and / or the other of the housing A component mounting structure for a power distribution board, wherein a gap for component placement is provided between the surface of the power distribution board and the component is mounted on the power distribution board within the gap. Component mounting structure of the power distribution board as claimed in claim 1, wherein the end portion of the power distribution board into the slit provided in said cover, characterized in that the engagement.   The component mounting structure for a distribution board according to claim 1, wherein a gap for mounting the component is formed between a back surface of the distribution board and a wall portion on the back side of the cover.   2. A plate-like terminal holder for holding each of the one and the other terminals is disposed in a pair near the center of the power distribution board, and the components are disposed outside the terminal holder. The component mounting structure of the distribution board in any one of -3. Component mounting structure of the power distribution board according to any one of claims 1 to 4, characterized in that the tip of the electrical contacts of the terminals of said one and the other are arranged within the width of the power distribution board.

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