JP5421470B2 - Junction block - Google Patents

Description

  The present invention relates to a junction block including a fuse connecting block, a circuit board, and a cover covering them.

  FIG. 14 shows an embodiment of a conventional junction block (see Patent Document 1).

  The junction block 71 includes a circuit board 73 on which various electronic components 72 are mounted, a connector block 75 connected to the left and right sides of the circuit board 73 with terminals 74, and a fuse block connected to the front side of the circuit board 73 with terminals 76. 77. The circuit board 73 and the blocks 75 and 77 are covered and protected by upper and lower covers (not shown) with the openings 75a and 77a side of the blocks 75 and 77 exposed.

  The connector block 75 includes an insulating resin connector housing (indicated by reference numeral 75) and a substantially L-shaped terminal 74 which is inserted into the connector housing at one end and soldered to the circuit board 73 at the other end. It is configured. The fuse block 77 has a substantially L-shaped terminal 76 which is inserted into an insulating resin fuse block main body (fuse holder) 78 and is soldered to the circuit board 73 at the other end. A conductive metal comb-shaped bus bar (not shown) inserted into the block main body 78 and a power input connector 80 accommodating one side of the bus bar.

  A plurality of blade-type fuses (not shown) are mounted on the fuse block main body 78 in two upper and lower stages and in parallel in the left-right direction. The fuse block main body 78 corresponds to a pair of upper and lower terminals in the upper and lower storage chambers 77a. Each tuning fork-like terminal portion (clamping terminal) between the pair of upper and lower terminals 76 and the pair of upper and lower bus bars is inserted. The connector 80 receives battery power and alternator power.

  In Patent Document 1, a separate terminal holder (not shown) is joined to the fuse block main body (fuse holder) 78, and each stage has an L-shaped terminal 76 (on the bus bar). A configuration example is also described in which a terminal is used instead. The circuit board 73 is provided with a copper core layer (not shown) in the middle in the thickness direction.

JP 2006-333583 A (FIGS. 6 and 1 to 2)

  However, in the conventional junction block 71, as the number of power supply circuits and the like increases according to the grade of the vehicle, it is necessary to newly manufacture a fuse block 77 having a different number of stages. In addition, as the number of fuse blocks 77 increases, there is a concern that the workability of assembling the fuse block (fuse connection block) 77 to the circuit board 73 and the cover is reduced.

  Further, when a fuse is inserted (especially when a plurality of fuses are simultaneously inserted into a plurality of fuse connection terminal portions of one terminal), a strong pressing force is applied to the terminals in the insertion direction, and solder connection of the circuit board 73 is performed. There was concern that it could adversely affect the department.

  In view of the above points, the present invention can improve the assembly of a block for connecting a fuse to a circuit board and a cover, and in addition, adverse effects on the board connecting portion of the bus bar and the terminal when the fuse is inserted. An object of the present invention is to provide a junction block that can prevent the above-described problem.

  In order to achieve the above object, a junction block according to claim 1 of the present invention includes a circuit board, one terminal connected to a circuit of the circuit board, and the other connected to a fuse. A connection block composed of a plurality of bus bars having terminal portions, and an insulating block body mounted on the upper side of the circuit board in a state where the plurality of bus bars are arranged, and an upper side of the connection block A cover for covering the circuit board and a plurality of the fuses connected to the other terminal portion of the connection block, and a hole is provided in the block body, and the hole is inserted into and engaged with the hole. A pin is provided in the cover, and a small hole for screwing a screw member into the pin is provided in the circuit board.

  With the above configuration, the connection block is constituted by an insulating block main body and a bus bar, and the bus bar mainly functions as a power bus bar and is connected to a conductive metal core layer or printed circuit of the circuit board.

  The connection block is positioned on the cover with pins, the circuit board is positioned and fixed to the pins by screwing, and the connection block and the circuit board are positioned. As a result, the board connection terminal portion of the bus bar of the connection block is smoothly inserted while being positioned in the small hole of the circuit board, and is connected to the circuit board by solder or the like. Since the board fixing part is also used for positioning the bus bar block, the junction block can be reduced in size.

  A junction block according to a second aspect is the junction block according to the first aspect, wherein the cover is provided with a rib that abuts the back surface of the bent portion of the bus bar of the connection block, and the rib provides an insertion force of the fuse. It is characterized by receiving.

  With the above configuration, when the fuse is inserted, that is, when the fuse is inserted into the terminal portion for connecting the fuse of the bus bar, the bus bar is pushed in the fuse insertion direction, but the bus bar contacts the rib of the cover, The rib receives the pressing force, prevents the force from being transmitted to the connection portion (solder portion) between the bus bar and the circuit board, and prevents an excessive stress load on the solder portion.

  The junction block according to claim 3 is the junction block according to claim 2, wherein the rib is formed in a stepped shape with a low protruding portion and a high protruding portion, and the low protruding portion supports the bus bar, and the high protruding portion. The portion is in contact with the back surface of the bent portion.

  From the above configuration, the protruding portion with the low rib supports the bus bar horizontally to prevent bending (bending) in the thickness direction of the bus bar, and the protruding portion with the rib abuts the vertical rear surface of the bus bar to insert the fuse ( Take the force of the bus bar in the horizontal direction.

  The junction block according to claim 4 is the junction block according to any one of claims 1 to 3, wherein one terminal portion soldered to the circuit of the circuit board and the other terminal portion connected to the fuse A plurality of terminals are inserted and held in the block main body of the terminal block, the terminal block is arranged so as to overlap with the connection block, and a rib is provided on the cover for contacting the back of the block main body of the terminal block. The rib receives the insertion force of the fuse.

  With the above configuration, when inserting the fuse, that is, when inserting the fuse into the terminal portion for connecting the fuse of the terminal, the terminal is pushed together with the terminal block body in the fuse insertion direction, but the terminal block body is covered. By abutting against the rib, the rib receives the pushing force and prevents the force from propagating to the connection part (solder part) between the terminal and the circuit board, thereby preventing excessive stress from being applied to the solder part. .

  According to the first aspect of the present invention, since the three parts of the cover, the connection block, and the circuit board are positioned relative to each other, the bus bar of the connection block can be smoothly and reliably connected to the circuit board without displacement. This increases the workability of assembling the three parts and at the same time increases the reliability of the electrical connection of the bus bar to the circuit board.

  According to the second aspect of the present invention, when the fuse is inserted, the bus bar of the connection block abuts against the rib of the cover, so that excessive stress is prevented from propagating to the circuit board, and the connection portion between the bus bar and the circuit board The quality of is maintained well.

  According to the invention described in claim 3, since the low protruding portion and the high protruding portion of the rib cooperate to reliably prevent the stress load on the bus bar when the fuse is inserted, the effect of the invention of claim 2 is achieved. Promoted.

  According to the fourth aspect of the present invention, when the fuse is inserted, the block main body of the terminal block comes into contact with the rib of the cover, so that excessive stress propagation to the circuit board is prevented, and the connection portion between the terminal and the circuit board The quality of is maintained well.

It is a disassembled perspective view which shows one Embodiment of the junction block which concerns on this invention. One form of the circuit board assembly for low grades is shown, (a) is a perspective view, (b) is a side view. 1A and 1B show a form of a high-grade circuit board assembly, in which FIG. It is a perspective view which shows one form of the bus bar block for high grades. It is a perspective view which shows one form of the circuit board assembly completed product for low grades. It is a perspective view which shows one form of the circuit board assembly finished product for high grades. It is a perspective view which shows one form of an inner cover. It is a perspective view of the state where the bus bar block is arranged on the inner cover. It is a top view of the state which has arrange | positioned the bus-bar block to a circuit board. It is a longitudinal cross-sectional view of the state which assembled | attached the circuit board assembly for high grades to the inner cover. It is a cross-sectional view of a state where a high-grade circuit board assembly is assembled to the inner cover. It is a top view of the state which has arrange | positioned the terminal block for low grades to an inner cover. It is sectional drawing of the state which has arrange | positioned the terminal block for low grades to an inner cover. It is a principal part perspective view which shows one form of the conventional junction block.

  FIG. 1 shows an embodiment of a junction block according to the present invention.

  The junction block 1 includes a printed circuit board 2 in which a copper core layer (not shown) is disposed in the middle in the thickness direction, a low-grade terminal block 3 connected to the front side of the circuit board 2, A high-grade bus bar block (connection block) 4 connected to the intermediate portion in the longitudinal direction of the circuit board 2 and disposed on the terminal block 3, and an assembly 5 of the terminal block 3 and the bus bar block 4 (FIG. 3) Insulation resin fuse holder 6 assembled in 3), a plurality of relays 7 mounted and connected to the circuit board 2, connector blocks 8 connected to the left and right sides of the circuit board 2, the terminal block 3 and the bus bar block 4, an insulating resin inner cover (cover) 9 that supports the connector block 8, the fuse holder 6, and the circuit board 2 on the opposite side of the inner cover 9 Those having a outer cover 10 made of an insulating resin.

  In FIG. 1, the bus bar block 4 is disposed on the lower side, the terminal block 3 is disposed thereon, and the circuit board 2 is disposed thereon, but these can also be used upside down. It is.

  In FIG. 1, a box-shaped electronic control unit (not shown) is disposed below the inner cover 9, and a connector portion 11 (FIG. 5) for connecting the electronic control unit is disposed on the rear end side of the circuit board 2. Is done. The inner cover 9 is fixed to the vehicle body or the like with a separate bracket (not shown). The fuse holder 6 has a lid 6a.

  In the specification, the directions of up, down, front, back, left, and right are for convenience of explanation, and do not necessarily coincide with the mounting direction of the junction block 1. In the specification, the vertical relationship will be described mainly in the form of vertically flipping FIG. The junction block 1 may be called a junction box or an electrical connection box. The inner cover 9 and the outer cover 10 may be referred to as one cover and the other cover.

  FIGS. 2A and 2B show a circuit board assembly 12 for low grade.

  The terminal block 3 includes a block main body (terminal holder) 13 made of an insulating resin and a substantially L-shaped (L) arranged in a plurality of stages (four stages in this example) on the block main body 13 in parallel in the left-right direction. Terminal 14 bent in a letter shape). The terminals 14 are, for example, one terminal each having a tuning fork-shaped sandwiching terminal portion (terminal portion) 14a from the bottom (board side) and the fourth layer having a plurality of sandwiching terminal portions 14a. It is a wide terminal, and a tab terminal 15 for power input is formed integrally with the wide terminal.

  Each terminal 14 is inserted into a vertical groove or vertical hole (not shown) of the block main body 13, and a horizontal portion 14 c in the vicinity of the intermediate bent portion of the terminal 14 is abutted and supported by a horizontal wall surface of the block main body 13. . It is also possible to integrally mold each terminal 14 to the block body 13. The block main body 13 of this example is composed of two parts, both parts 13a and 13b are joined by locking means, and the upper part 13b fixes each terminal 14 between the lower part 13a.

  The bottom surface of the block main body 13 is joined to the front surface 2a of the circuit board 2, one clamping terminal portion (fuse connecting portion) 14a of each terminal 14 protrudes from the front end of the block main body 13, and the other pin-shaped terminal of each terminal 14 The portion 14b is inserted into the through hole 16 of the circuit board 2 and connected to the printed circuit (not shown) on the front and back of the circuit board 2 or an intermediate copper core layer, and the tab terminal 15 for power input is on the block body 13 side. Protrudes from the edge. The copper core layer is located between the front and back insulating substrates.

  FIGS. 3A and 3B show a circuit board assembly 17 for high grade. The high-grade circuit board assembly 17 is configured by adding the high-grade bus bar block 4 to the low-grade circuit board assembly 12.

  As shown in FIG. 4, the bus bar block 4 includes a block main body 18 made of an insulating resin bent in a step shape in a substantially crank shape in a side view, and a plurality of bus bar blocks 4 arranged in two layers on the front and back surfaces of the block main body 18. It comprises a power bus bar 19 of books.

  The block body 18 includes a thick and horizontal upper plate-like wall portion 20 on the front side, a thin and horizontal lower plate-like wall portion 21, and a vertical plate that connects both wall portions 20 and 21. The lower wall portion 21 is extended along the bus bar 19 only in a portion 21 a where the upper and lower bus bars 19 are extended. The lower (fifth) bus bar 19 is short, and the upper (sixth) bus bar 19 is long. The upper-layer bus bar 19 is linearly arranged in various lengths in the longitudinal direction of the circuit board 2 (FIG. 3). Terminals 14 of each layer of the terminal block 3 are arranged in the first to fourth layers.

  Each bus bar 19 is bent in a substantially crank shape along the block main body 18, has a horizontal fuse connecting clamping terminal portion (terminal portion) 19 a on the front end side, and is a pin-shaped board connecting terminal perpendicular to the rear end side. It has a part 19b. The clamping terminal portion 19a continues on the same surface as the horizontal portion 19c, the horizontal portion continues to the vertical portion (bent portion) 19d, the vertical portion 19d continues to the lower horizontal portion 19e, and the horizontal portion 19e continues to the downward vertical portion 19f. The substrate connection terminal portion 19b extends from the vertical portion 19f.

  The board connection terminal portion 19b is solder-connected to an intermediate core layer of the circuit board 2 (FIG. 3) or a printed circuit (not shown) of the circuit board 2. The core layer is for distributing and supplying power. In this example, an upper layer bus bar 19 is insert-molded in the block body 18, and a lower layer bus bar 19 is fixed to the block body 18 by heat welding. Both bus bars 19 can be fixed by insert molding. Each bus bar 19 is prevented from being lifted by a rib 23 in the transverse direction of the block body 18.

  As shown in FIG. 3, the terminal portion of each bus bar 19 is in a state where the lower surface of the upper wall portion 20 of the high grade bus bar block main body 18 is in contact with the upper surface of the upper part 13b of the low grade terminal block main body 13. 19b is fixed to the circuit board 2 by soldering, and the pressing and holding of the terminal 14 by the component 13b on the upper side of the terminal block body 13 is ensured.

  FIG. 5 shows a circuit board assembly completed product 24 that forms a main part of a low-grade junction block, and FIG. 6 shows a circuit board assembly completed product 25 that forms a main part of a high-grade junction block.

  As shown in FIG. 5, the terminal block 3 is arranged at the front of the circuit board 2, the connector blocks 8 are arranged on the left and right sides of the circuit board 2, and a plurality of relays 7 are connected to the circuit board 2 between the left and right connector blocks 8. Then, the control unit connector 11 is disposed on the rear end side of the circuit board 2.

  As shown in FIG. 6, each bus bar 19 extending rearward from the bus bar block 4 passes horizontally over the terminal 26 and the relay 7 of the connector block 8 and uses the space between the terminal 26 and the relay 7 to make a circuit. It is inserted and connected to the hole 16 of the substrate 2.

  In FIG. 3, the block main body 13 of the terminal block 3 is formed of a synthetic resin material having high heat resistance, and the block main body 18 of the bus bar block 4 is formed of an inexpensive synthetic resin material having low heat resistance. Since the terminal block 3 is in direct contact with the circuit board 2 and is easily deformed by the heat effect of the solder, the bus bar block 4 is mounted on the terminal block 3 using a resin having high heat resistance. The block body 18 is not affected by heat, and an inexpensive resin material (for example, PP) having low heat resistance can be used. As the resin material having high heat resistance, for example, PPS, PSF, PES and the like generally known as super engineering plastics can be used.

  In FIG. 4, a rectangular (preferably square) hole 27 is provided in the lower wall portion 21 of the block main body 18 of the bus bar block 4 between the bus bars 19 that are largely separated from each other in the left and right directions. In this manner, the inner cover 9 is provided with a pin 28 protruding vertically in the hole 27. As shown in FIG. 8, the bus bar block 4 is accurately positioned on the inner cover 9 by inserting the pin 28 into the hole 27. The outer diameter of the pin 28 is set slightly smaller than the inner width of the hole 27. The pin 28 protrudes from the lower wall portion 21 (FIG. 4) of the bus bar block 14 in the protruding direction of the board connecting terminal portion 19 b of the bus bar 19.

  A female screw hole 29 is provided at the tip of the pin 18, and a small small hole 30 for screw insertion is provided in the circuit board 2 as shown in FIG. In FIG. 8, the circuit board 2 is supported at the tip of the pin 28, and in this state, the circuit board 2 is screwed and fixed to the pin 28 with a screw (male screw member) 31. The supporting pin 28 is also arranged at the rear part of the inner cover 9.

  In this example, there is only one hole 27 in the bus bar block 4 in FIG. 4. As an example, a plurality of holes are provided in parallel between the bus bars 19, and an integral connecting piece for connecting the bus bars 19 in the alignment direction ( It is preferable to use as a hole for cutting (not shown), and a large hole 27 for positioning is applied.

  As shown in FIG. 7, the inner cover 9 has a bulging portion 33 that is deeply dug on the front end side of the horizontal wide substrate portion 32 in accordance with the step shape of the bus bar block 4 (FIG. 4). The upper wall portion 20 (FIG. 4) of the bus bar block 4 is located at 33, and the lower wall portion 21 is located along the substrate portion 32 (see FIG. 8).

  The bulging portion 33 includes a vertical wall portion 34 (FIG. 7) that follows the front end of the substrate portion 32, a horizontal wall portion (second substrate portion) 35 that continues short forward from the vertical wall portion 34, and a horizontal wall portion 34. And a plurality of ribs 37 are erected in parallel on the inner surface of the horizontal wall portion 35, and a columnar portion 38 is erected along the vertical wall portion 34. The pin 28 is erected at the tip of the columnar portion 38.

  The rib 37 is composed of a low protruding portion 37a that extends long along the horizontal wall portion 35 and a short and high protruding portion (rib) 37b that continues across the vertical wall portion 34, and has a stepped shape on the low protruding portion 37a. Followed by a high protrusion 37b. The front end of the columnar portion 38 is located on the same plane as the front end of the high protruding portion 37b.

  As shown in FIGS. 10 to 11, when the high-grade circuit board assembly 17 (FIG. 3) is assembled to the inner cover 9, the vertical portion of each bus bar 19 on the upper layer (sixth layer) of the bus bar block 4 ( Since the rear end surface (back surface) of 19d is in contact with the front end of the protruding portion 37b having a high rib 37, the pressing force when the fuse 39 is inserted is received by the protruding portion 37b having a high rib 37, and the pressing force ( Stress) is prevented from being transmitted to the solder connection portion (in place of 19b) between the bus bar 19 and the circuit board 2, and the quality of the solder connection portion is ensured.

  The upper-layer bus bar 19 in this example is fixed to the block body 18 by insert molding, and it is difficult to transmit the fuse insertion force to the circuit board 2, but the connection quality with the circuit board 2 is more reliably improved by the above configuration.

  Since the rear end surface of the vertical portion 19d ′ of each bus bar 19 ′ in the lower layer (fifth layer) of the bus bar block 4 abuts on the front end surface of the vertical wall portion 22 of the block body 18, the fuse insertion force is applied to the vertical wall portion 22. And the propagation of the fuse insertion force to the circuit board 2 is blocked. The fifth layer means the fifth layer counted from the circuit board 2 side, and the terminals 14 of the terminal block 3 are arranged in the first to fourth layers.

  A synthetic resin fuse holder 6 is attached to the front end of each block body 13, 18 of the lower terminal block 3 and the upper bus bar block 4, and each fuse 39 in each cavity (accommodating chamber) of the fuse holder 6. As a result, the fuse block 40 is configured. In the specification, the lower layer refers to the side close to the circuit board 2.

  Each bus bar 19 in the upper layer (sixth layer) of the bus bar block 4 is in contact with the low protruding portion 37a of the rib 37, is supported integrally with the bus bar block 4, and cooperates with the high protruding portion 37b of the rib 37 when a fuse is inserted. The stress load on the bus bar 19 is prevented. Bending (bending) of the bus bar 19 in the plate thickness direction is prevented by the low protruding portion 37a. Further, each of the upper bus bars 19 is secured to a creeping distance for insulation between the lower protruding portion 37 a and the outer surface (upper surface) of the inner cover 9. The pair of upper and lower tab terminals 39 a of the fuse 39 are press-fitted and connected to the holding terminal portion 19 a of the bus bar 19. First and second-stage fuses 39 ′ are connected to the terminal portions 14 a of each layer of the terminal block 3.

  In FIG. 10, when the low-grade circuit board assembly 12 (FIG. 2) is used, the bus bar block 4 is not provided, so that the position of the bus bar block 4 is a space. The fuse holder 3 is commonly used for low and high. In FIG. 11, the fuses 41 on both the left and right sides are box-shaped fusible links, and are connected to the tab terminal portion instead of the clamping terminal portion 14 a of the terminal 14. Reference numeral 42 denotes a power input connector following the terminal block 3 or the fuse holder 6.

  12 to 13 show a low-grade specification fuse block in which the high-grade bus bar block 4 (FIG. 10) is not assembled. The vertical rear wall surface of the block body (holder) 13 of the terminal block 3 is shown in FIG. A protrusion (rib) 43 is provided on the left end side, and a rib 44 for abutting the protrusion 43 on the inner cover 9 is provided apart from the bus bar block abutting rib 37 (FIG. 10). . The rib 44 is bent in an L shape and continues to the side wall 36 side of the bulging portion 33 of the inner cover 8. Further, a rib 45 is provided on the right end side of the inner cover 9 so that the housing rear end face 42 a of the connector 42 integrated with the fuse holder 6 abuts.

  The terminal block main body 13 abuts against these ribs (at least the ribs 44), so that the fuse insertion is received by the ribs 44 even in the low grade specification, and the terminal block 3 and the terminal 14 and circuit associated therewith are tilted backward. An excessive stress load on the solder connection portion with the substrate 2 is prevented, and the quality of the solder connection portion is maintained.

  In FIG. 12, the terminal block body 13 is provided with a plurality of grooves 46 and through-holes 47 in the height direction in multiple layers (four layers in this example) in the front-rear direction and in parallel in the left-right direction. The vertical portion of each terminal 14 is inserted and held in the through hole 47, and the back surface of the vertical portion of the terminal 14 abuts on the back surface of the groove portion 46 or the through hole 47, so that the insertion force of the fuse 39 ′ is received. Yes. Therefore, the insertion force of the fuse 39 'can be received by receiving the block body 13 with the rib 44 as described above.

  In the above embodiment, the screw (screw member) 31 is screwed into the screw hole 29 of the pin 28 of the inner cover 9 and the circuit board 2 is fixed. It is also possible to fix the circuit board 2 with a nut (screw member) instead of 31.

  The junction block according to the present invention is used for enhancing the assembly of the block for connecting the fuse to the circuit board and the cover, and in addition to preventing the adverse effect on the board connecting portion of the bus bar and the terminal when the fuse is inserted. be able to.

1 Junction block 2 Circuit board 3 Terminal block 4 Bus bar block (block for connection)
9 Inner cover (cover)
13 Block body 14 Terminal 14a, 19a Holding terminal part (terminal part)
18 Block body 19 Bus bar 19d Vertical part (bent part)
27 hole 28 pin 31 screw (screw member)
30 Small hole 37 Rib 37a Low projecting part 37b High projecting part 39, 39 'Fuse 44 Rib

Claims (4)

A circuit board,
A plurality of bus bars having one terminal portion soldered to the circuit of the circuit board and the other terminal portion connected to the fuse, and mounted on the upper side of the circuit board with the plurality of bus bars arranged A connecting block composed of an insulating block main body,
A cover that covers the circuit board from above the connection block; and a plurality of the fuses that are connected to the other terminal portion of the connection block.
A hole is provided in the block main body, a pin that is inserted and engaged with the hole is provided in the cover, and a small hole for screwing a screw member into the pin is provided in the circuit board. Junction block.   The junction block according to claim 1, wherein a rib that abuts the back surface of the bent portion of the bus bar of the connection block is provided on the cover, and the rib receives an insertion force of the fuse.   The rib is formed in a step shape with a low protruding portion and a high protruding portion, the low protruding portion supports the bus bar, and the high protruding portion abuts against the back surface of the bent portion. The listed junction block.   A plurality of terminals having one terminal portion soldered to the circuit of the circuit board and the other terminal portion connected to the fuse are inserted and held in the block body of the terminal block, and the terminal block is connected to the connection block 4. The rib according to claim 1, wherein the cover is provided with a rib that contacts the back surface of the block body of the terminal block, and the rib receives an insertion force of the fuse. The listed junction block.

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