JP7182129B2 - Busbar incorrect assembly prevention structure - Google Patents

Description

The present invention relates to a busbar incorrect assembly prevention structure.

2. Description of the Related Art A terminal block is known in which overlapped portions of a plurality of cables, which are wiring members, are connected by fastening together with bolts or the like (see, for example, Patent Document 1). This terminal block connects the first plus cable on the battery side and the second plus cable on the junction board side together on the plus terminal, and connects the first minus cable on the battery side and the second minus cable on the junction board side. Tighten together on the negative terminal.
Further, Patent Document 2 discloses an assembled battery in which a plurality of stages each provided with a different terminal are formed on an accessory pedestal. According to this assembled battery, by changing the heights of the plurality of terminals, for example, the identification of the GND terminal is enhanced, so that incorrect wiring can be easily prevented when the assembled battery is mounted on a vehicle.

JP 2014-222568 A JP 2017-130312 A

However, when the wiring member is a thin busbar (plate-shaped conductor), the busbar is easily deformed if the assembly procedure of the busbars is wrong. For this reason, there are cases in which the wrong assembly is not noticed. A bus bar that is erroneously assembled in this manner causes a loss in fastening axial force, resulting in loosening over time and possibly causing abnormal heat generation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a busbar erroneous assembly prevention structure capable of preventing an erroneous assembly procedure between busbars.

The above objects of the present invention are achieved by the following configurations.
(1) A plurality of plate-like wiring members, each of which has an overlapped portion and is laminated in a predetermined stacking order, is fastened together by a fastening member penetrating the overlapped portion; An incorrect assembly prevention piece formed on a part of the plate-like wiring member to be assembled and hanging down at a portion overlapping with the upper plate-like wiring member incorrectly assembled on the lower side in a stacking order different from the predetermined stacking order. and a relief provided in an assembly portion where a plurality of the plate-shaped wiring members are assembled, for receiving the erroneous assembly prevention piece of the lower plate-shaped wiring member assembled in the predetermined stacking order. and a portion, wherein the relief portion is recessed in a side wall of the assembly portion parallel to the axis of the fastening member and has recess inner side surfaces facing both side end surfaces of the incorrect assembly prevention piece, The plate-shaped wiring member assembled on the lower side is fastened together with the plate-shaped wiring member assembled on the upper side, and the overlapped portion of the plate-shaped wiring member assembled on the lower side is common around the axis of the fastening member. Incorrect assembly of the bus bar, wherein one side end face of the both side end faces of the incorrect assembly prevention piece abuts against the inner side face of the recess facing the one side end face when the piece is about to rotate in the tightening direction. prevention structure.

According to the busbar incorrect assembly prevention structure of the configuration (1) above, the incorrect assembly prevention piece is formed on a part of the plate-shaped wiring member (busbar) assembled on the lower side. The erroneous assembly prevention piece can be a portion bent and extended from a part of the plate-like wiring member (for example, one side of the overlapping portion). When the overlapped portions of the plate-shaped wiring member to be assembled on the lower side are stacked in a predetermined order of stacking, the incorrect assembly prevention piece extends downward from the plate-shaped wiring member to be assembled on the upper side. Since it hangs down, it does not interfere with the plate-shaped wiring member assembled on the upper side. Furthermore, since the erroneous assembly prevention piece formed on the plate-like wiring member assembled on the lower side is accommodated in the relief portion of the assembly portion, it is possible to avoid interference of the erroneous assembly prevention piece with the assembly portion. .
On the other hand, the erroneous assembly prevention piece prevents the plate-like wiring member that is supposed to be assembled on the upper side when the overlapping portions of the plate-like wiring members that are supposed to be assembled on the lower side are stacked and assembled in a stacking order different from the predetermined stacking order. It is arranged on a shaped wiring member. In other words, if the plate-like wiring member that should be attached to the lower side has already been attached to the plate-like wiring member that should be attached to the upper side, the erroneous assembly prevention piece is attached to the plate-like wiring member that is to be attached to the upper side. Interference makes assembly impossible. As a result, the busbar erroneous assembly prevention structure can physically prevent an assembly procedure error in the fastening of the plate-like wiring members. As a result, it is possible to prevent human error in the assembly procedure and prevent the outflow of defective products.
Further, in the bus bar erroneous assembly prevention structure, the erroneous assembly prevention piece formed on the plate-shaped wiring member assembled on the lower side is accommodated in the relief portion of the assembly portion, so that the erroneous assembly prevention piece avoid interfering with

Furthermore, according to the busbar erroneous assembly prevention structure having the configuration ( 1 ) above, the inner side surfaces of the concave portion of the relief portion face both side end surfaces of the erroneous assembly prevention piece, and the erroneous assembly prevention piece is located on the relief portion. By contacting the inner side surface of the recess, it is positioned with respect to the assembly portion.
Therefore, when the plate-shaped wiring member assembled on the lower side provided with the erroneous assembly prevention piece is fastened together with the plate-shaped wiring member assembled on the upper side, torque is applied to the overlapping portion. At this time, the overlapping portion of the plate-like wiring member assembled on the lower side tries to rotate in the co-tightening direction about the axis of the fastening member, but the side end face of the mis-assembly prevention piece touches the inner side surface of the recess of the relief portion. It abuts and receives torque. As a result, the plate-like wiring member assembled on the lower side is prevented from rotating together even when a strong torque is applied. Furthermore, since the side end surfaces of the erroneous assembly prevention pieces abut against the inner side surfaces of the recesses of the relief portions, they are less likely to deform even when a strong torque is applied.
In addition, the plate-like wiring member to be assembled on the lower side where the erroneous assembly prevention piece is provided is positioned with respect to the assembly portion, so that the insertion hole of the overlapping portion through which the fastening member penetrates is of a minimum size. can be done. As a result, the contact area between the plate-shaped wiring members can be increased, and the electrical resistance can be reduced.

( 2 ) The busbar incorrect assembly prevention structure according to (1) above, wherein a terminal mounting portion is provided at the other end of the plate-shaped wiring member having the overlapping portion at one end.

According to the busbar mis-assembly prevention structure having the configuration ( 2 ) above, when the terminal mounting portion is provided at the other end of the plate-shaped wiring member, the plate-shaped wiring member assembled on the lower side exerts a strong torque on the overlapping portion. Co-rotation is prevented even if a load is applied, so that the load on the terminal attachment portion (the electrical connection portion on the side opposite to the overlapping portion) can be suppressed.

( 3 ) A detent piece formed on a portion of the plate-shaped wiring member assembled on the upper side, and a detent piece provided on the assembly portion to lock the detent piece so as to rotate the plate-shaped wiring member on the upper side. A bus bar incorrect assembly prevention structure according to the above (1) or (2), further comprising: a detent portion for detent.

According to the busbar incorrect assembly prevention structure of the configuration ( 3 ) above, when the plate-shaped wiring member assembled on the upper side provided with the anti-rotation piece is fastened together with the plate-shaped wiring member assembled on the lower side, Torque is applied to the overlapping part. At this time, the overlapped portion of the plate-like wiring member assembled on the upper side tries to rotate in the co-fastening direction around the axis of the fastening member, but the anti-rotation piece receives the torque by the anti-rotation portion. As a result, the plate-shaped wiring member assembled on the upper side is prevented from co-rotating even when a strong torque is applied.

According to the busbar erroneous assembly prevention structure according to the present invention, it is possible to physically prevent erroneous assembly procedures between busbars.

The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading the following detailed description of the invention (hereinafter referred to as "embodiment") with reference to the accompanying drawings. .

1 is an exploded perspective view of an electric connection box provided with a busbar erroneous assembly prevention structure according to a first embodiment of the present invention; FIG. FIG. 2 is an assembled perspective view of the electrical junction box shown in FIG. 1; FIG. 3 is a plan view of FIG. 2; FIG. 4 is a cross-sectional view taken along IV-IV in FIG. 3; FIG. 10 is an exploded perspective view of a main part of an electrical junction box having a busbar erroneous assembly prevention structure according to a comparative example; FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 5, where (a) is a cross-sectional view of busbars fastened together in a predetermined stacking order, and (b) is a cross-fastened busbar in a stacking order different from the predetermined stacking order. It is a sectional view of a bus bar. FIG. 10 is an exploded perspective view of an electric connection box provided with a busbar erroneous assembly prevention structure according to a second embodiment of the present invention; FIG. 8 is an assembled plan view of the electrical junction box shown in FIG. 7;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 are an exploded perspective view and an assembled perspective view of an electric connection box 11 having a structure for preventing incorrect assembly of busbars according to a first embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. In this embodiment, the directions of up, down, front, back, left, and right follow the arrow directions of up, down, front, back, left, and right shown in FIG.
The busbar incorrect assembly prevention structure according to the first embodiment can be suitably used for the electrical junction box 11, for example. In addition, the busbar incorrect assembly prevention structure can be used for a terminal block or the like for electrically connecting a battery assembly and a control device such as an inverter.

The busbar erroneous assembly prevention structure according to the first embodiment includes a pre-assembled bus bar 19 and a rear-assembled bus bar 21 which are plate-shaped wiring members, an erroneous assembly prevention piece 13 formed on the pre-assembled bus bar 19, and a fastening member. and a bolt 15 as a main configuration. In addition, the busbar erroneous assembling prevention structure further includes an assembling portion 17 in the electric junction box 11 .

The pre-assembled bus bar 19 and the rear-assembled bus bar 21 as the plate-shaped wiring member according to the first embodiment have a pre-assembled overlapping portion 23 and a rear-assembled overlapping portion 37, respectively. In the pre-assembled busbar 19 and the rear-assembled busbar 21, the pre-assembled overlapping portion 23 and the rear-assembled overlapping portion 37, which are laminated in a predetermined stacking order, are fastened together by bolts 15 passing through them.

The incorrect assembly prevention piece 13 is formed on a portion of the pre-assembled bus bar 19 that is assembled on the lower side. It is arranged so as to hang down at a portion overlapping the path of the incorrectly assembled upper rear-assembled bus bar 21 .

In this embodiment, the case where the plate-like wiring member is a thin plate-like bus bar made of metal (conductive metal such as copper or aluminum) will be described as an example. Therefore, the plate-like wiring member assembled on the lower side in the stacking direction is referred to as pre-assembled busbar 19 , and the plate-like wiring member attached to the upper side in the stacking direction is referred to as post-assembled busbar 21 .

An incorrect assembly prevention piece 13 is provided on a part of the pre-assembled bus bar 19 assembled on the lower side. A portion of the pre-assembled bus bar 19 according to the first embodiment is the pre-assembled overlapping portion 23 . The pre-assembled overlapping portion 23 is formed in a substantially square shape. A bolt insertion hole 25 through which the bolt 15 passes is formed in the central portion of the pre-assembled overlapping portion 23 .

In the first embodiment, a flanged hexagonal bolt having a flange portion 27 is used as the bolt 15 . Note that the bolt 15 is not limited to a flanged hexagonal bolt. A general hexagon bolt without the flange portion 27 may be used.

The incorrect assembly prevention piece 13 is bent from the front side portion of the pre-assembled overlapping portion 23 and hangs down. The incorrect assembly prevention piece 13 is formed at a position where the distance R from the center of the bolt insertion hole 25 is larger than the radius of the flange portion 27 . The hanging erroneous assembly prevention piece 13 has a rectangular plate shape elongated in the left-right direction. The incorrect assembly prevention piece 13 is formed with a height h in the hanging direction.

The pre-assembled bus bar 19 has an upwardly bent intermediate upright portion 29 connected to the right side of the pre-assembled overlapping portion 23 . A horizontal connecting portion 31 extending rightward and bent obliquely forward at the right end is continuously provided at the upper end of the intermediate standing portion 29 . A terminal attachment portion 33 bent upward is continuously provided at the tip of the horizontal connection portion 31 in the extending direction. That is, the pre-assembled bus bar 19 has the pre-assembled overlapping portion 23 at one end and the terminal mounting portion 33 at the other end.

The rear assembled bus bar 21 assembled on the upper side has a rear assembled overlapping portion 37 having a bolt insertion hole 35 formed at the rear end of a rectangular plate portion 39 extending with a length L in the front-rear direction. The length L of the rectangular plate portion 39 is set larger than the distance R of the pre-assembled overlapping portion 23 (R<L). The rear assembling portion 37 has an upright side plate portion 41 that is vertically bent and extends rightward from the front side portion of the rectangular plate portion 39 . On the right side of the upright side plate portion 41, a right end upright portion 43 that is bent rearward at a right angle and stands up is continuously provided. A fastening piece portion 47 extending to the right and having a bolt insertion hole 45 through which a stud bolt 69 penetrates is connected to the upper end of the right end upright portion 43 .

Note that the pre-assembled bus bar 19 of the first embodiment includes the intermediate standing portion 29, the horizontal connecting portion 31, and the terminal mounting portion 33 as an example. In the pre-assembled bus bar 19, the intermediate standing portion 29, the horizontal connecting portion 31, and the terminal mounting portion 33 may be formed in other shapes. Further, the rear assembled bus bar 21 of the first embodiment is formed with the standing side plate portion 41, the right end standing portion 43, and the fastening piece portion 47 as an example. In the rear assembled busbar 21, the upright side plate portion 41, the right end upright portion 43, and the fastening piece portion 47 may be formed in other shapes.

An important requirement of the busbar erroneous assembly prevention structure according to the first embodiment is that the erroneous assembly prevention piece 13 of the pre-assembled busbar 19 is incorrectly assembled on the lower side in a stacking order different from the predetermined stacking order. That is, it hangs down at a location that overlaps with the path of the post-assembled bus bar 21 . In the first embodiment, the predetermined stacking order is a stacking order in which the pre-assembled overlapping portion 23 of the pre-assembled bus bar 19 is on the lower side and the rear-assembled overlapping portion 37 of the post-assembled bus bar 21 is on the upper side.

Therefore, when the stacking order is different from the predetermined stacking order, that is, when the rear-assembled overlapping portion 37 of the rear-assembled bus bar 21 is stacked on the lower side and the pre-assembled overlapping portion 23 of the pre-assembled bus-bar 19 is stacked on the upper side, the erroneous assembly prevention piece is formed. 13 hangs down at a location that overlaps with the path of the rear-assembled bus bar 21 that has been incorrectly assembled. That is, the erroneous assembly prevention piece 13 hits and interferes with the rectangular plate portion 39 of the rear-assembled bus bar 21 from above. Therefore, the pre-assembled bus bar 19 cannot be physically assembled later.

The electrical connection box 11 according to the first embodiment is integrally molded with an insulating synthetic resin. The electrical connection box 11 is formed with an assembly portion 17 for accommodating a plurality of wiring members in addition to the pre-assembled busbar 19 and the post-assembled busbar 21 inside the outer wall portion 49 . The assembling portion 17 is provided with a relief portion 51 for receiving the erroneous assembly prevention piece 13 of the pre-assembled bus bar 19 assembled on the lower side in a predetermined stacking order.

The escape portion 51 of the first embodiment is recessed in the side wall 55 of the assembly portion 17 parallel to the axis 53 of the bolt 15 and has a width W in the direction perpendicular to the axis 53 (horizontal direction). It is formed larger than the width C of the sticking prevention piece 13 in the same direction by the minimum gap d. The minimum clearance d is a clearance for assembling the erroneous assembly prevention piece 13 to the relief portion 51 smoothly when the pre-assembled bus bar 19 is assembled to the assembly portion 17 .

The escape portion 51 is formed as a rectangular recess with an open top by cutting out the upper end of the inner side wall 55 formed in the assembly portion 17 . The thickness of the escape portion 51 in the front-rear direction is set slightly larger than the plate thickness of the incorrect assembly prevention piece 13 . The right side end surface 59 a of the incorrect assembly prevention piece 13 inserted into the escape portion 51 faces the right concave inner surface 61 a of the escape portion 51 . The left side end face 59 of the erroneous assembly prevention piece 13 faces the left recess inner side face 61 b of the relief portion 51 .

The assembly portion 17 is formed with a seat portion 63 on which the pre-assembled overlapping portion 23 and the rear-assembled overlapping portion 37 are placed. The seat portion 63 is formed on the upper surface of a prismatic portion 65 integrally formed with the assembly portion 17 . A bolt fixing hole 67 into which the bolt 15 is screwed is provided in the center of the seat portion 63 . A nut may be insert-molded inside the bolt fixing hole 67 . A metal terminal plate electrically connected to the pre-assembled overlapping portion 23 may be provided on the upper surface of the seat portion 63 . The terminal board may be conductively connected to a predetermined circuit of the assembly portion 17 .

A stud bolt 69 as a fastening member may be provided in advance in the seat portion 63 at a position corresponding to the bolt fixing hole 67 . In this case, the pre-assembled portion 23 and the post-assembled portion 37 are tightened together by a nut 71 after the stud bolt 69 is passed through.

A mounting surface 73 and a seat portion 75 having a predetermined level difference with respect to the seat portion 63 are formed in the assembly portion 17 .
The relief portion 51 , the seat portion 63 , the mounting surface 73 and the seat portion 75 constitute the assembly portion 17 .

The mounting surface 73 is formed according to the horizontal connecting portion 31 of the pre-assembled bus bar 19 assembled on the lower side. The fastening piece portion 47 of the rear assembled bus bar 21 assembled on the upper side is placed on the seat portion 75 . A stud bolt 69 to which the nut 71 is screwed is provided in the center of the seat portion 75 . A metal terminal plate electrically connected to the fastening piece portion 47 is provided on the upper surface of the seat portion 75 . The terminal board is conductively connected to a predetermined circuit of the assembly portion 17 .
The mounting surface 73 and the seat portion 75 are formed by assembling the pre-assembled overlapping portion 23 and the rear-assembling overlapping portion 37 to the seat portion 63 in a predetermined stacking order, so that the horizontal connection portion 31 and the fastening piece portion 47 are placed in parallel. It is set with a step that allows it to be placed.

Next, the operation of the busbar erroneous assembly prevention structure according to the first embodiment will be described.
In the busbar erroneous assembly prevention structure according to the first embodiment, the erroneous assembly prevention piece 13 is formed on a part of the pre-assembled busbar 19 assembled on the lower side. The erroneous assembly prevention piece 13 is a portion bent and extended from a portion of the pre-assembled bus bar 19 (one side portion of the pre-assembled overlapping portion 23). When the pre-assembled overlapping portions 23 of the pre-assembled bus bar 19 assembled on the lower side are stacked and assembled in a predetermined stacking order, the erroneous assembly prevention piece 13 prevents the path of the post-assembled bus bar 21 assembled on the upper side. Since it hangs downward, it does not interfere with the rear assembled bus bar 21 assembled on the upper side. Furthermore, since the erroneous assembly prevention piece 13 formed on the pre-assembled bus bar 19 assembled on the lower side is accommodated in the relief portion 51 of the assembly portion 17 , the erroneous assembly prevention piece 13 interferes with the assembly portion 17 . can be avoided.

On the other hand, if the pre-assembled overlapping portion 23 of the pre-assembled bus bar 19 that should be assembled on the lower side is assembled in a stacking order different from the predetermined stacking order, the erroneous assembly prevention piece 13 is attached to the upper side. It is arranged on the route of the rectangular plate portion 39 of the rear-assembled bus bar 21 that should be installed. In other words, if the pre-assembled busbar 19 that should be assembled on the lower side has already been assembled with the rear-assembled busbar 21 that should be attached on the upper side, the incorrect assembly prevention piece 13 should be attached to the rear-assembled busbar 21 that should be attached on the upper side. interference and assembly becomes impossible.

Therefore, if the pre-assembled bus bar 19 that is supposed to be assembled on the lower side has already been assembled with the post-assembled bus bar 21 in a stacking order different from the predetermined stacking order, the incorrect assembly prevention piece 13 will prevent the post-assembled bus bar 21 from interference and assembly becomes impossible.
As a result, the busbar erroneous assembly prevention structure according to the first embodiment physically prevents an erroneous assembly procedure for fastening the pre-assembled busbar 19 and the post-assembled busbar 21, which are plate-shaped wiring members. can be done. As a result, it is possible to prevent human error in the assembly procedure and prevent the outflow of defective products.

Further, in the busbar erroneous assembly prevention structure according to the first embodiment, the relief portion 51 is recessed in the side wall 55 of the assembling portion 17 parallel to the axis 53 of the bolt 15 , and the erroneous assembly prevention piece 13 It has recess inner side surfaces 61a and 61b facing both side end surfaces 59a and 59b. Therefore, the recess inner side surfaces 61a and 61b of the relief portion 51 are opposed to both side end surfaces 59a and 59b of the erroneous assembly prevention piece 13, and the erroneous assembly prevention piece 13 faces the recess portion inner side surfaces 61a and 61b of the relief portion 51. It is positioned with respect to the assembly part 17 by abutting it.

Therefore, when the pre-assembled bus bar 19 assembled on the lower side where the erroneous assembly prevention piece 13 is provided is tightened together with the post-assembled bus bar 21 assembled on the upper side, torque is applied to the pre-assembled overlapping portion 23 . At this time, the pre-assembled overlapping portion 23 of the pre-assembled bus bar 19 that is assembled on the lower side tries to rotate in the co-tightening direction about the axis 53 of the bolt 15, but the side end face 59b of the incorrect assembly prevention piece 13 escapes. It comes into contact with the recess inner side surface 61b of the portion 51 and receives torque. As a result, the pre-assembled bus bar 19 assembled on the lower side is prevented from rotating together even when a strong torque is applied. Furthermore, since the side end surface 59b of the erroneous assembly prevention piece 13 abuts against the inner side surface 61b of the recessed portion 51, it is difficult to deform even when a strong torque is applied.

Further, the pre-assembled bus bar 19 assembled on the lower side where the erroneous assembly prevention piece 13 is provided is positioned with respect to the assembly portion 17 so that the bolt insertion hole of the pre-assembled overlapping portion 23 through which the bolt 15 penetrates. 25 can be minimized. As a result, the contact area between the pre-assembled bus bar 19 and the post-assembled bus bar 21, which are plate-shaped wiring members, can be increased, and the electrical resistance can be reduced.

In addition, in the busbar erroneous assembly prevention structure according to the first embodiment, the erroneous assembly prevention piece is attached to the pre-assembled busbar 19 assembled on the lower side of the pre-assembled overlapping portion 23 and the rear-assembled overlapping portion 37 which are fastened together. Since the busbars 13 are formed to protrude, the area of the pre-assembled busbars 19 can be increased. As a result, the pre-assembled bus bar 19 can enhance heat dissipation to the assembly portion 17 by heat conduction and heat dissipation to the atmosphere (atmosphere) by heat transfer.

Further, in the busbar erroneous assembly prevention structure according to the first embodiment, the width W of the relief portion 51 is formed larger than the width C of the erroneous assembly prevention piece 13 by the minimum gap d. Therefore, the erroneous assembly prevention piece 13 ensures good assembly workability to the escape portion 51, while the both side end faces 59a and 59b abut against the recess inner side surfaces 61a and 61b of the escape portion 51 with a slight displacement. . When the pre-assembled bus bar 19 provided with the erroneous assembly prevention piece 13 is tightened together with the post-assembled bus bar 21, torque is applied to the pre-assembled overlapping portion 23. - 特許庁At this time, the pre-assembled overlapping portion 23 of the pre-assembled bus bar 19 tries to rotate in the co-tightening direction about the axis 53 of the bolt 15 , but the side end surface 59 b of the mis-assembly prevention piece 13 is inside the concave portion of the relief portion 51 . It comes into contact with the side surface 61b and receives torque.

In addition, in the busbar erroneous assembly prevention structure according to the first embodiment, the terminal mounting portion 33 to which the mating female terminal (not shown) is fitted is fitted to the other end of the pre-assembled busbar 19 having the pre-assembled overlapping portion 23 at one end. is provided. The pre-assembled bus bar 19 assembled on the lower side is prevented from co-rotating even if a strong torque is applied to the pre-assembled overlapped portion 23, thereby preventing the terminal mounting portion 33 (electrical connection on the side opposite to the pre-assembled overlapped portion 23). 33 can be suppressed, and electrical connectivity with the mating female terminal is not degraded.

Further, the assembly portion 17 of the busbar erroneous assembly prevention structure according to the first embodiment is formed with a seat portion 63 on which the pre-assembled overlapping portion 23 and the rear-assembled overlapping portion 37 are placed. Further, the mounting portion 17 is formed with a mounting surface 73 and a seat portion 75 having a predetermined level difference with respect to the seat portion 63 . The mounting surfaces 73 and the seat portions 75 are respectively formed at heights corresponding to the pre-assembled busbars 19 and the rear-assembled busbars 21 in which the pre-assembled overlapping portions 23 and the rear-assembled overlapping portions 37 are stacked in a predetermined stacking order. be done. That is, the pre-assembled busbars 19 and the rear-assembled busbars 21 each have a contact portion 81 (see FIG. 1) that contacts the mounting surface 73 and the seat portion 75 when the pre-assembled overlapping portion 23 and the rear-assembled overlapping portion 37 are stacked in a predetermined stacking order. 1) are in parallel contact with the mounting surface 73 and the seat portion 75 . The pre-assembled bus bar 19 and the post-assembled bus bar 21 are placed on the placement surface 73 and the seat portion 75 to eliminate a step corresponding to a different plate thickness at the stacking position, thereby suppressing deformation.

FIG. 5 is an exploded perspective view of essential parts of an electric junction box having a busbar misassembly prevention structure according to a comparative example, and FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 4B is a cross-sectional view of the pre-assembled bus bar 83 and the rear-assembled bus bar 85 that are fastened together in order, and FIG. .

In the busbar erroneous assembly prevention structure according to the comparative example shown in FIG. In this case, if the pre-assembled overlapping portion 23 and the post-assembled overlapping portion 37 are assembled in a predetermined stacking order, as shown in FIG. And the contact portion 81 of the rear-assembled bus bar 85 and the mounting surface 88 are in parallel contact with each other.

On the other hand, in the bus bar erroneous assembly prevention structure according to the comparative example, if the pre-assembled portion 23 and the post-assembled portion 37 are assembled in a stacking order different from the predetermined stacking order (procedure in the direction of arrow a in FIG. False), as shown in FIG. 6B, the pre-assembled bus bar 83 and the post-assembled bus bar 85, which are thin bus bars, are easily deformed.

On the other hand, in the busbar erroneous assembly prevention structure according to the first embodiment, erroneous assembly procedures are physically prevented. Deformation of the pre-assembled bus bar 19 and the post-assembled bus bar 85 caused by not being placed parallel to the seat portion 75 can be reliably prevented.

Next, a busbar erroneous assembly prevention structure according to a second embodiment of the present invention will be described.
7 and 8 are an exploded perspective view and an assembled plan view of an electric connection box 11A having a busbar misassembly prevention structure according to a second embodiment of the present invention. In the second embodiment, the same reference numerals are given to the same constituent members as those of the busbar erroneous assembly prevention structure of the first embodiment, and detailed description thereof will be omitted.

The busbar erroneous assembly prevention structure according to the second embodiment includes a pre-assembled bus bar 19A and a rear-assembled bus bar 21A, which are plate-like wiring members, an erroneous assembly prevention piece 13A formed on the pre-assembled bus bar 19A, and a post-assembled bus bar 19A. Principal components include a detent piece 77 formed on the bus bar 21A and a bolt 15 as a fastening member. In addition, the busbar erroneous assembly prevention structure further includes an assembly portion 17A in the electric junction box 11A.

The erroneous assembly prevention piece 13A is formed on a part of the pre-assembled bus bar 19A assembled on the lower side (the rear side portion of the pre-assembled overlapping portion 23), and the post-assembled overlapping portion 37 and the pre-assembled portion 37 differ from the predetermined stacking order. In the stacking order with the overlapping portion 23, it is arranged so as to hang down at a position overlapping with the rear assembled overlapping portion 37, which is the path of the upper rear assembled bus bar 21A that is incorrectly assembled on the lower side.

The anti-rotation piece 77 is formed upright on a portion of the rear-assembled bus bar 21A assembled on the upper side (the rear side portion of the rear-assembled overlapping portion 37). The upright anti-rotation piece 77 has a rectangular plate shape elongated in the left-right direction, and is formed so as to be adjacent to the outer wall portion 49 .

Further, in the assembling portion 17A of the busbar erroneous assembling prevention structure according to the second embodiment, the escaping portion 51 in the assembling portion 17 of the busbar erroneous assembling preventing structure according to the first embodiment is replaced with a relief. A portion 51A is provided.
The escape portion 51A of the second embodiment has a rectangular shape with an open top by protruding a pair of vertically extending ribs 61A and 61B inside the outer wall portion 49 formed in the assembly portion 17A. It is formed as a recess. In the relief portion 51A, the height of the ribs 61A and 61B in the front-rear direction is set slightly larger than the plate thickness of the incorrect assembly prevention piece 13A. The right side end surface 59a of the incorrect assembly prevention piece 13A inserted into the escape portion 51A faces the inner surface of the right rib 61A of the escape portion 51A. The left side end surface 59b of the erroneous assembly prevention piece 13A faces the inner surface of the left rib 61B of the relief portion 51A.

Further, the pair of ribs 61A and 61B in the relief portion 51A of the second embodiment abut on the left and right side end surfaces 79a and 79b of the anti-rotation piece 77, thereby forming the anti-rotation portion 62 for anti-rotation of the rear assembled bus bar 21A. Also serves as.

Therefore, according to the busbar erroneous assembly prevention structure according to the second embodiment described above, the erroneous assembly prevention piece 13A is arranged such that the pre-assembled overlapping portion 23 of the pre-assembled bus bar 19A assembled on the lower side is arranged in a predetermined stacking order. When they are stacked and assembled, they hang downward from the route of the rear-assembled busbar 21A assembled on the upper side, so that they do not interfere with the rear-assembled busbar 21A assembled on the upper side. Furthermore, since the erroneous assembly prevention piece 13A formed on the pre-assembled bus bar 19A assembled on the lower side is accommodated in the relief portion 51A of the assembly portion 17A, the erroneous assembly prevention piece 13A interferes with the assembly portion 17A. can be avoided.

On the other hand, if the pre-assembled overlapping portion 23 of the pre-assembled bus bar 19A, which should be assembled on the lower side, is stacked in a stacking order different from the predetermined stacking order, the erroneous assembly prevention piece 13A is assembled on the upper side. It is arranged in the rear-assembled overlapping portion 37 of the rear-assembled bus bar 21A. In other words, if the pre-assembled bus bar 19A, which should be assembled on the lower side, has already been assembled with the rear-assembled bus bar 21A, which should be attached on the upper side, the incorrect assembly prevention piece 13A should be attached on the rear-assembled bus bar 21A. interference and assembly becomes impossible.

Therefore, if the pre-assembled bus bar 19A, which is supposed to be assembled on the lower side, has already been assembled with the post-assembled bus bar 21A in a stacking order different from the predetermined stacking order, the incorrect assembly prevention piece 13A will not be attached to the post-assembled bus bar 21A. interference and assembly becomes impossible.
As a result, the busbar erroneous assembly prevention structure according to the second embodiment is similar to the busbar erroneous assembly prevention structure according to the first embodiment described above. 21A can be physically prevented from making a mistake in the assembly procedure. As a result, it is possible to prevent human error in the assembly procedure and prevent the outflow of defective products.

Furthermore, according to the busbar misassembly prevention structure according to the second embodiment, the rearwardly assembled busbar 21A assembled on the upper side where the anti-rotation piece 77 is provided is fastened together with the pre-assembled busbar 19A assembled on the lower side. At this time, torque is applied to the rear assembled portion 37 . At this time, the rear assembled overlapping portion 37 of the rear assembled bus bar 21 A that is assembled on the upper side tries to rotate in the co-tightening direction about the axis 53 of the bolt 15 , but the anti-rotation piece 77 is stopped by the anti-rotation portion 62 . torque will be received. As a result, the rear-mounted bus bar 21A, which is mounted on the upper side, is prevented from rotating together even when a strong torque is applied.

In the busbar erroneous assembly prevention structure according to the second embodiment, the pair of ribs 61A and 61B locks the escape portion 51A for receiving the erroneous assembly prevention piece 13A of the pre-assembled busbar 19A and the anti-rotation piece 77. It also serves as a detent portion 62 for detenting the rear assembly bus bar 21A. Of course, the present invention is not limited to this. A configuration consisting of the anti-rotation piece 77 and the anti-rotation portion 62 of the rear assembled bus bar 21A may be provided separately.

Therefore, according to the busbar erroneous assembly prevention structure according to the present embodiment, it is possible to physically prevent erroneous assembly procedures between busbars.
The present invention is not limited to the above-described embodiments, and it is also possible for those skilled in the art to combine each configuration of the embodiments with each other, modify and apply based on the description of the specification and well-known technology. It is intended by the invention and falls within the scope for which protection is sought.
For example, in the configuration example of the above-described embodiment, the number of the plate-like wiring members is two, but the number of the plate-like wiring members may be three or more.

Here, the features of the embodiments of the busbar incorrect assembly prevention structure according to the present invention described above are briefly summarized in [1] to [4] below.
[1] Each of the overlapped portions (the pre-assembled overlapped portion 23 and the rear-assembled overlapped portion 37) and overlapped in a predetermined stacking order is a fastening member (bolt 15) passing through these overlapped portions. ), a plurality of plate-shaped wiring members (pre-assembled busbars 19, 19A and rear-assembled busbars 21, 21A) fastened together by
The upper plate-like wiring member that is formed in a part of the plate-like wiring member (pre-assembled busbars 19, 19A) assembled to the lower side and is incorrectly assembled to the lower side in a stacking order different from the predetermined stacking order. erroneous assembly prevention pieces (13, 13A) hanging down at locations overlapping with (rear-assembled busbars 21, 21A);
The erroneous assembly preventing piece for the lower plate-shaped wiring member assembled on the lower side in the predetermined stacking order, provided in the assembly portion (17, 17A) where the plurality of the plate-shaped wiring members are assembled. a relief portion (51, 51A) for receiving the
A bus bar incorrect assembly prevention structure, comprising:
[2] The escape portion (51) is recessed in the side wall (55) of the assembly portion parallel to the axis (53) of the fastening member, ), the busbar erroneous assembly prevention structure according to the above [1], characterized in that it has concave inner side surfaces (61a, 61b) facing ).
[3] A terminal mounting portion (33) is provided at the other end of the plate-like wiring member (pre-assembled busbars 19, 19A) having the overlapping portion (pre-assembled overlapping portion 23) at one end. The busbar incorrect assembly prevention structure according to [1] or [2].
[4] A detent piece (77) formed on a part of the plate-like wiring member (rear-mounted bus bar 21A) assembled on the upper side;
a detent portion (62) provided in the assembly portion (17A) for engaging the detent piece to detent the plate-like wiring member on the upper side;
The busbar erroneous assembly prevention structure according to any one of the above [1] to [3], characterized by comprising:

REFERENCE SIGNS LIST 13: Incorrect assembly prevention piece 15: Bolt 17: Assembly portion 19: Pre-assembled bus bar (platy wiring member assembled on the lower side)
21 . . . rear-mounted bus bar (plate-like wiring member mounted on the upper side)
23 ... pre-assembled overlapped portion (overlapped portion)
37 ... Rear assembly overlapping portion (overlapping portion)
51 Relief portion 53 Axis line 55 Side wall 63 Seat portion 73 Placement surface 75 Seat portion d Minimum gap

Claims (3)

a plurality of plate-shaped wiring members, each of which has an overlapping portion and is laminated in a predetermined stacking order, and the overlapping portions are fastened together by a fastening member penetrating the overlapping portions;
The misassembly is formed in a part of the plate-shaped wiring member assembled on the lower side, and hangs down at a portion overlapping with the upper plate-shaped wiring member incorrectly assembled on the lower side in a stacking order different from the predetermined stacking order. a sticking prevention piece;
a relief portion provided in an assembling portion where the plurality of plate-shaped wiring members are assembled, and receiving the erroneous assembly prevention piece of the lower plate-shaped wiring member assembled on the lower side in the predetermined stacking order; ,
with
the relief portion is recessed in a side wall of the assembly portion parallel to the axis of the fastening member, and has recess inner side surfaces facing both side end surfaces of the erroneous assembly prevention piece;
The plate-shaped wiring member assembled on the lower side is fastened together with the plate-shaped wiring member assembled on the upper side, and the overlapping portion of the plate-shaped wiring member assembled on the lower side is fastened together about the axis of the fastening member. A bus bar erroneous assembly prevention device, wherein one side end face of said both side end faces of said erroneous assembly prevention piece abuts against said one side end face of said concave inner side surface when said erroneous assembly prevention piece is about to rotate in a direction. structure. 2. The busbar incorrect assembly prevention structure according to claim 1 , wherein a terminal mounting portion is provided at the other end of the plate-like wiring member having the overlapping portion at one end . a detent piece formed on a part of the plate-shaped wiring member assembled on the upper side;
a rotation-stopping portion provided in the assembly portion for locking the rotation-stopping piece to stop the plate-like wiring member on the upper side from rotating;
The busbar incorrect assembly prevention structure according to claim 1 or 2, characterized by comprising :

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