JP2020087699A - Structure for preventing error assembly in bus bar - Google Patents

Abstract

To provide a structure for preventing an error assembly in a bus bar capable of preventing an assemble procedure error between the bus bars.SOLUTION: A structure for preventing an error assembly in a bus bar comprises: a pre-assembly bus bar 19 and a post-assemble bus bar 21, in which overlapping parts which include a pre-assembly overlapping part 23 and a post-assembly overlapping part 37 and have been overlapped in a prescribed lamination order are commonly fastened with a bolt 15 penetrating these overlapping parts; an error assemble prevention piece 13 that is formed in a part of the pre-assembly bus bar 19, and is hooked at a portion overlapped with the post-assemble bus bar 21 erroneously assembled on a lower side in a lamination order different from the prescribed lamination order; and a releasing part 51 that is provided to an assemble part 17 in which the pre-assembly bus bar 19 and the post-assemble bus bar 21 are assembled, and the error assemble prevention piece 13 of the pre-assembly bus bar 19 assembled in the lower side as a prescribed lamination order is accepted.SELECTED DRAWING: Figure 1

Description

The present invention relates to a busbar misassembly preventing structure.

2. Description of the Related Art A terminal block is known in which overlapping portions of a plurality of cables, which are wiring members, are connected together by tightening them with bolts or the like (see, for example, Patent Document 1). In this terminal block, the first plus cable on the battery side and the second plus cable on the junction board side are fastened together on the plus terminal, and the first minus cable on the battery side and the second minus cable on the junction board side are fastened together. Tighten together on the negative terminal.
Further, Patent Document 2 discloses an assembled battery in which a plurality of stages each having different terminals are provided on an auxiliary machine pedestal. According to this battery pack, by changing the height of the plurality of terminals, for example, the distinguishability of the GND terminal is improved, so that incorrect wiring can be easily prevented when the battery pack is mounted on a vehicle.

JP, 2014-222568, A JP, 2017-130312, A

However, when the wiring member is a bus bar (plate-shaped conductor) having a thin plate thickness, the bus bar is easily deformed if the assembly procedure of the bus bars is wrong. Therefore, there are cases where the user does not notice that the assembly is wrong. The bus bar mis-assembled in this manner causes a loss in the fastening axial force, and therefore may loosen over time and cause abnormal heat generation.

The present invention has been made in view of the above situation, and an object thereof is to provide a busbar erroneous assembly preventing structure capable of preventing an erroneous assembly procedure between busbars.

The above object according to the present invention is achieved by the following configurations.
(1) A plurality of plate-shaped wiring members that are fastened together by fastening members that pass through the overlapping portions An erroneous assembly preventing piece that is formed on a part of the plate-shaped wiring member to be assembled and that hangs down at a position overlapping with the upper plate-shaped wiring member that is erroneously assembled on the lower side in a stacking order different from the predetermined stacking order. And a relief for receiving the erroneous assembly prevention piece of the lower plate-shaped wiring member that is provided in an assembly portion to which the plurality of plate-shaped wiring members are assembled and is assembled on the lower side in the predetermined stacking order. A structure for preventing misassembly of a bus bar, which comprises:

According to the busbar erroneous assembly preventing structure having the above configuration (1), the erroneous assembly preventing piece is formed on a part of the plate-like wiring member (busbar) assembled on the lower side. The erroneous assembly preventing piece may be a portion that is bent and extended from a part (for example, one side of the overlapping portion) of the plate-shaped wiring member. When the overlapping portion of the plate-like wiring members to be assembled on the lower side is stacked and assembled in a predetermined stacking order, the mis-assembly preventing piece is directed downward from the plate-like wiring members to be assembled on the upper side. Since it hangs, it does not interfere with the plate-like wiring member assembled on the upper side. Further, since the erroneous assembly preventing piece formed on the plate-like wiring member to be assembled on the lower side is housed in the relief portion of the assembly portion, it is possible to avoid the erroneous assembly preventing piece from interfering with the assembly portion. ..
On the other hand, the erroneous assembly prevention piece is a plate that is supposed to be assembled on the upper side when the overlapping portions of the plate-like wiring members which are supposed to be assembled on the lower side are stacked in a stacking order different from the predetermined stacking order. Is arranged on the wiring member. In other words, if the plate-shaped wiring member that should be assembled on the lower side is already assembled on the plate-shaped wiring member that should be assembled on the upper side, It interferes and it becomes impossible to assemble. As a result, the busbar erroneous assembly preventing structure can physically prevent an erroneous assembly procedure for fastening the plate-shaped wiring members. As a result, it is possible to prevent human mistakes in the assembly procedure and prevent the outflow of defective products.
In addition, in the busbar misassembly prevention structure, the misassembly prevention piece formed on the plate-like wiring member to be assembled on the lower side is housed in the relief part of the assembly part. You can avoid interfering with.

(2) The escape portion has a concave inner surface that is recessed in a side wall of the assembly portion parallel to the axis of the fastening member and that faces both end surfaces of the misassembly preventing piece. The structure for preventing wrong assembly of the bus bar according to (1) above.

According to the busbar erroneous assembly prevention structure of the above configuration (2), the inner surface of the recess of the relief portion faces both end surfaces of the incorrect assembly prevention piece, and the erroneous assembly prevention piece is in the recess of the relief portion. By contacting the side surface, it is positioned with respect to the assembly portion.
Therefore, when the plate-shaped wiring member provided on the lower side provided with the misassembly preventing 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 to be assembled on the lower side tries to rotate in the tightening direction together with the axis of the fastening member as a center, but the side end surface of the misassembly preventing piece is located on the inner surface of the recess of the relief portion. It comes into contact and receives torque. As a result, the plate-shaped wiring member mounted on the lower side is prevented from rotating together even when a strong torque is applied. Furthermore, since the side end surface of the erroneous assembly preventing piece comes into contact with the inner surface of the recess of the relief portion, it is difficult to deform even if a strong torque is applied.
Further, the plate-like wiring member to be assembled on the lower side provided with the erroneous assembly preventing piece is positioned with respect to the assembly portion, so that the insertion hole of the overlapping portion through which the fastening member penetrates can be minimized. You can As a result, the contact area between the plate-shaped wiring members can be increased and the electrical resistance can be reduced.

(3) The busbar erroneous assembly prevention structure according to (1) or (2), 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 erroneous assembly prevention structure of the above configuration (3), 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 has a strong torque on the overlapping portion. Even if a load is applied, co-rotation is prevented, so that it is possible to suppress a load on the terminal mounting portion (electrical connection portion on the side opposite to the overlapping portion).

(4) A whirl-stop piece formed on a part of the plate-like wiring member to be assembled on the upper side, and a whirl-stop piece provided on the assembling portion for locking the whirl-stop piece around the upper plate-like wiring member. The busbar misassembly preventing structure according to any one of the above (1) to (3), further comprising: a whirl stop portion for stopping.

According to the busbar erroneous assembly preventing structure having the above configuration (4), when the plate-like wiring member provided on the upper side with the whirl-stop piece is fastened together with the plate-like wiring member assembled on the lower side, Torque is applied to the overlapping part. At this time, the overlapping portion of the plate-shaped wiring member assembled on the upper side tries to rotate in the tightening direction together around the axis of the fastening member, but the anti-rotation piece receives torque by the anti-rotation portion. As a result, the plate-shaped wiring member assembled on the upper side is prevented from rotating together even when a strong torque is applied.

According to the busbar erroneous assembly prevention structure of the present invention, it is possible to physically prevent an erroneous assembly procedure between the busbars.

The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter, referred to as “embodiment”) with reference to the accompanying drawings. ..

It is an exploded perspective view of an electric junction box provided with a bus bar wrong assembly prevention structure concerning a 1st embodiment of the present invention. It is an assembly perspective view of the electric junction box shown in FIG. FIG. 3 is a plan view of FIG. 2. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. It is a principal part disassembled perspective view of the electric connection box provided with the bus-bar misassembly prevention structure which concerns on a comparative example. FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5, (a) is a cross-sectional view of a bus bar co-fastened in a predetermined stacking order, and (b) is a co-fastened in a stacking order different from the predetermined stacking order. It is sectional drawing of a bus bar. It is a disassembled perspective view of the electric connection box provided with the bus-bar misassembly prevention structure which concerns on 2nd Embodiment of this invention. FIG. 8 is an assembly plan view of the electrical junction box shown in FIG. 7.

Embodiments according to the present invention will be described below with reference to the drawings.
1 and 2 are an exploded perspective view and an assembled perspective view of an electric junction box 11 having a busbar misassembly preventing structure according to a first embodiment of the present invention, and FIG. 3 is a plan view of a main part of FIG. 4 is a sectional view taken along the line IV-IV in FIG. In this embodiment, the up, down, front, back, left, and right directions follow the up, down, front, back, left, and right arrow directions shown in FIG. 1.
The busbar misassembly preventing structure according to the first embodiment can be suitably used for the electrical junction box 11, for example. In addition, the busbar misassembly preventing structure can be used for a terminal block or the like for electrically connecting the battery assembly and a control device such as an inverter.

The busbar misassembly preventing structure according to the first embodiment is a preassembly busbar 19 and a postassembly busbar 21 which are plate-shaped wiring members, a misassembly prevention piece 13 formed on the preassembly busbar 19, and a fastening member. And a bolt 15 that is a main component. Further, the busbar misassembly preventing structure further includes an assembly part 17 in the electrical junction box 11.

The pre-assembled bus bar 19 and the post-assembled bus bar 21 as the plate-shaped wiring member according to the first embodiment include a pre-assembled lap portion 23 and a post-assembled lap portion 37, which are lap portions, respectively. The pre-assembled bus bar 19 and the post-assembled bus bar 21 are fastened together by a bolt 15 penetrating the pre-assembled lap portion 23 and the post-assembled lap portion 37, which are stacked in a predetermined predetermined stacking order.

The mis-assembly preventing piece 13 is formed on a part of the pre-assembled bus bar 19 which is assembled on the lower side, and is arranged on the lower side in the stacking order of the rear assembly stacking section 37 and the previous assembly stacking section 23 different from the predetermined stacking order. It is arranged so as to hang down at a position overlapping with the path of the incorrectly assembled upper rear assembled bus bar 21.

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

An erroneous assembly preventing piece 13 is provided on a part of the pre-assembled bus bar 19 assembled on the lower side. A part 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 penetrates is formed in the center of the pre-assembled overlapping portion 23.

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

The mis-assembly preventing piece 13 is bent from the front side portion of the pre-assembled overlapping portion 23 and hangs down. The misassembly preventing 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 mis-assembly preventing piece 13 has a rectangular plate piece shape that is long in the left-right direction. The misassembly preventing piece 13 is formed with a height h in the hanging direction.

The prefabricated bus bar 19 has an intermediate upright portion 29 that is bent upward and is continuously provided on the right side portion of the preassembled overlapping portion 23. At the upper end of the intermediate standing portion 29, a horizontal connecting portion 31 extending rightward and bent obliquely forward at the right end is continuously provided. A terminal mounting portion 33 bent upward is continuously provided at a tip end of the horizontal connecting portion 31 in the extending direction. That is, the prefabricated bus bar 19 has the prefabricated overlapping portion 23 at one end and the terminal mounting portion 33 at the other end.

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

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

An important requirement of the busbar misassembly preventing structure according to the first embodiment is that the misassembly preventing piece 13 of the preassembled busbar 19 is misassembled on the lower side in a stacking order different from the predetermined stacking order. It is to hang down at a position overlapping with the route of the rear assembled bus bar 21. In the first embodiment, the predetermined stacking order is a stacking order in which the pre-assembled stacking portion 23 of the pre-assembled bus bar 19 is on the lower side and the rear assembled bus bar 21 is on the upper side.

Therefore, when the stacking order different from the predetermined stacking order, that is, when the rear assembly stacking portion 37 of the rear assembly bus bar 21 is on the lower side and the previous assembly stacking portion 23 of the pre-assembled bus bar 19 is stacked on the upper side, the misassembly preventing piece is attached. 13 hangs down at a position overlapping the path of the rear assembled bus bar 21 that is erroneously assembled on the lower side. That is, the erroneous assembly preventing piece 13 hits the rectangular plate portion 39 of the rear assembled bus bar 21 from above and interferes with it. Therefore, the pre-assembled bus bar 19 cannot be physically assembled later.

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

The relief portion 51 of the first embodiment is recessed in the side wall 55 of the assembly portion 17 that is parallel to the axis 53 of the bolt 15, and the width W in the direction (left-right direction) orthogonal to the axis 53 is incorrect. 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 gap d is a clearance that allows the misassembly preventing piece 13 to be smoothly assembled to the escape portion 51 when the preassembled bus bar 19 is assembled to the assembly portion 17.

The escape portion 51 is formed as a rectangular recess whose upper side is open by notching the upper end of the inner side wall 55 formed in the assembly portion 17. The escape portion 51 has a thickness in the front-rear direction set to be slightly larger than the plate thickness of the misassembly preventing piece 13. The right side end surface 59a of the misassembly preventing piece 13 inserted into the escape portion 51 faces the recess inner side surface 61a on the right side of the escape portion 51. The left side end surface 59 of the misassembly preventing piece 13 faces the recess inner side surface 61b on the left side of the escape portion 51.

The assembling part 17 is formed with a seat part 63 on which the stacked pre-assembled stacking part 23 and the post-assembled stacking part 37 are placed. The seat portion 63 is formed on the upper surface of the prismatic portion 65 integrally formed with the assembling 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. In addition, a metal terminal plate may be provided on the upper surface of the seat portion 63 so as to be electrically connected to the pre-assembled overlapping portion 23. The terminal plate may be electrically connected to a predetermined circuit of the assembling unit 17.

It should be noted that the seat portion 63 may be provided in advance with a stud bolt 69 as a fastening member at a position corresponding to the bolt fixing hole 67. In this case, the pre-assembled overlapping portion 23 and the post-assembled overlapping portion 37 are fastened together by the nut 71 after the studs 69 are penetrated.

A mounting surface 73 and a seat portion 75 having a predetermined step 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 form the assembly portion 17.

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

Next, the operation of the busbar misassembly preventing structure according to the first embodiment described above will be described.
In the busbar misassembly preventing structure according to the first embodiment, the misassembly preventing piece 13 is formed on a part of the preassembled busbar 19 that is assembled on the lower side. The mis-assembly preventing piece 13 is a portion that is bent and extended from a part of the pre-assembled bus bar 19 (one side of the pre-assembled overlapping portion 23). When the pre-assembled stacking portion 23 of the pre-assembled bus bar 19 that is assembled to the lower side is stacked and assembled in a predetermined stacking order, the mis-assembly preventing piece 13 is routed to the upper assembly bus bar 21 that is assembled to the upper side. Since it hangs downward, it does not interfere with the rear assembled bus bar 21 assembled on the upper side. Further, the misassembly preventing piece 13 formed on the preassembled bus bar 19 assembled to the lower side is housed in the relief section 51 of the assembly section 17, so that the misassembly preventing piece 13 interferes with the assembly section 17. Can be avoided.

On the other hand, when the pre-assembled stacking portion 23 of the pre-assembled bus bar 19 which is supposed to be assembled on the lower side is stacked and assembled in a stacking order different from the predetermined stacking order, the mis-assembly preventing piece 13 is assembled on the upper side. It is arranged in the path of the rectangular plate portion 39 of the rear assembled bus bar 21 that should be installed. In other words, the pre-assembled bus bar 19 that should be assembled on the lower side has the rear assembled bus bar 21 that should be assembled on the upper side when the rear assembled bus bar 21 that is supposed to be assembled on the upper side is already assembled. It interferes with and becomes impossible to assemble.

Therefore, in the pre-assembled bus bar 19 that should be assembled on the lower side, when the post-assembled bus bar 21 has already been assembled in a stacking order different from the predetermined stacking order, the misassembly preventing piece 13 is attached to the post-assembled bus bar 21. It interferes with and becomes impossible to assemble.
As a result, the busbar misassembly preventing structure according to the first embodiment physically prevents an assembly procedure error in fastening the preassembled busbar 19 and the postassembled busbar 21, which are plate-shaped wiring members. You can As a result, it is possible to prevent human mistakes in the assembly procedure and prevent the outflow of defective products.

Further, in the busbar misassembly preventing structure according to the first embodiment, the relief portion 51 is provided in the side wall 55 of the assembly portion 17 parallel to the axis 53 of the bolt 15, and the misassembly preventing piece 13 is provided. It has inner side surfaces 61a and 61b of the recess facing the both end surfaces 59a and 59b. Therefore, the recess inner side surfaces 61a, 61b of the escape portion 51 face the both side end surfaces 59a, 59b of the misassembly preventing piece 13, and the misassembly preventing piece 13 is disposed on the recess inner surface 61a, 61b of the escape portion 51. By abutting, it is positioned with respect to the assembly portion 17.

Therefore, when the pre-assembled bus bar 19 provided with the erroneous assembly preventing piece 13 is assembled 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 to be assembled to the lower side tries to rotate in the tightening direction around the axis 53 of the bolt 15 as a center, but the side end surface 59b of the misassembly preventing piece 13 is released. The inner surface 61b of the concave portion of the portion 51 is brought into contact with the inner surface of the concave portion 61 to receive the 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 abuts the recess inner surface 61b of the escape portion 51, the misassembly preventing piece 13 is unlikely to be deformed even when a strong torque is applied.

Further, the pre-assembled bus bar 19 to be assembled on the lower side provided with the erroneous assembly preventing piece 13 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 a minimum size. As a result, it is possible to increase the contact area between the pre-assembled bus bar 19 and the post-assembled bus bar 21, which are plate-shaped wiring members, and reduce the electric resistance.

Further, in the busbar misassembly preventing structure according to the first embodiment, the misassembly preventing piece is assembled from the preassembled busbar 19 that is assembled to the lower side of the preassembled stacking section 23 and the rear assembly stacking section 37 that are fastened together. Since the protrusion 13 is formed, the area of the preassembled bus bar 19 can be increased. As a result, the pre-assembled bus bar 19 can enhance the heat dissipation to the assembling portion 17 by heat conduction and the heat dissipation to the atmosphere (atmosphere) by heat transfer.

Further, in the busbar misassembly preventing structure according to the first embodiment, the width W of the escape portion 51 is formed larger than the width C of the misassembly preventing piece 13 by the minimum gap d. Therefore, while the erroneous assembly preventing piece 13 ensures good workability in assembling to the relief portion 51, both end surfaces 59a and 59b contact the recess inner side surfaces 61a and 61b of the relief portion 51 with a slight displacement. .. When the pre-assembled bus bar 19 provided with the misassembly preventing piece 13 is fastened together with the post-assembled bus bar 21, 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 tries to rotate in the tightening direction around the axis 53 of the bolt 15, but the side end surface 59b of the misassembly preventing piece 13 is inside the recess of the escape portion 51. It comes into contact with the side surface 61b and receives torque.

Further, in the busbar misassembly preventing structure according to the first embodiment, the other end of the prefabricated busbar 19 having the prefabricated stacking portion 23 at one end is fitted with the mating female terminal (not shown) at the terminal mounting portion 33. Is provided. The pre-assembled bus bar 19 to be assembled on the lower side is prevented from co-rotating even when a strong torque is applied to the pre-assembled stacking portion 23, so that the terminal mounting portion 33 (electrical connection on the side opposite to the pre-assembled stacking portion 23) is formed. (Part) 33 can be suppressed, and the electrical connectivity with the mating female terminal is not reduced.

Further, the seat portion 63 on which the stacked front assembly portion 23 and rear assembly portion 37 are placed is formed in the assembly portion 17 of the busbar misassembly preventing structure according to the first embodiment. Further, the mounting surface 73 and the seat portion 75 having a predetermined step with respect to the seat portion 63 are formed in the assembly portion 17. The respective mounting surfaces 73 and the seat portions 75 are formed at heights corresponding to the pre-assembled bus bar 19 and the post-assembled bus bar 21 on which the pre-assembled stacking portion 23 and the post-assembled stacking portion 37 are stacked in a predetermined stacking order. To be done. That is, in each of the pre-assembled bus bar 19 and the post-assembled bus bar 21, when the pre-assembled stacking section 23 and the post-assembled stacking section 37 are stacked in a predetermined stacking order, the contact section 81 that contacts the mounting surface 73 and the seat section 75 (see FIG. 1) comes into contact with the mounting surface 73 and the seat portion 75 in parallel. The pre-assembled bus bar 19 and the post-assembled bus bar 21 eliminate the step difference due to the plate thickness that differs at the stacking position by being mounted on the mounting surface 73 and the seat portion 75, and the deformation is suppressed.

FIG. 5 is an exploded perspective view of an essential part of an electrical junction box having a busbar misassembly preventing structure according to a comparative example, FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5, and (a) shows a predetermined stacking. FIG. 11B is a cross-sectional view of the pre-assembled bus bar 83 and the post-assembled bus bar 85 that are co-tightened in order, and FIG. 9B is a cross-sectional view of the pre-assembled bus bar 83 and the post-assembled bus bar 85 that are co-fastened in a stacking order different from a predetermined stacking order. ..

In the busbar misassembly preventing structure according to the comparative example shown in FIG. 5, a plurality of mounting surfaces 86 and 88 having a predetermined step with respect to the seat portion 84 are formed. In this case, if the pre-assembled stacking section 23 and the post-assembly stacking section 37 are assembled in a predetermined stacking order, as shown in FIG. 6A, the contact section 81 of the pre-assembled bus bar 83 and the mounting surface 86, 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 busbar misassembly preventing structure according to the comparative example, if the pre-assembled stacking section 23 and the post-assembly stacking section 37 are assembled in a stacking order different from the predetermined stacking order (the procedure in the direction of arrow a in FIG. 5). By mistake), 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 structure for preventing wrong assembly of the bus bar according to the first embodiment, an incorrect assembly procedure is physically prevented. Therefore, the contact portions 81 of the pre-assembled bus bar 19 and the post-assembled bus bar 85 are placed on the mounting surface 73 and the mounting surface 73, respectively. It is possible to reliably prevent the deformation of the pre-assembled bus bar 19 and the post-assembled bus bar 85 due to not being placed parallel to the seat portion 75.

Next, a busbar misassembly preventing structure according to the second embodiment of the present invention will be described.
7 and 8 are an exploded perspective view and an assembly plan view of an electrical junction box 11A having a busbar misassembly preventing structure according to a second embodiment of the present invention. Note that, in the second embodiment, the same members as those of the busbar misassembly preventing structure of the first embodiment are denoted by the same reference numerals and detailed description thereof will be omitted.

The busbar misassembly preventing structure according to the second embodiment is a preassembly busbar 19A and a postassembly busbar 21A which are plate-shaped wiring members, a misassembly assembly piece 13A formed on the preassembly busbar 19A, and a postassembly. The main components are a rotation stop piece 77 formed on the bus bar 21A and a bolt 15 as a fastening member. In addition, the structure for preventing incorrect assembly of the bus bar further includes an assembly portion 17A in the electrical junction box 11A as a configuration.

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

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

Further, in the assembly portion 17A of the busbar misassembly prevention structure according to the second embodiment, the escape portion 51 is replaced with the escape portion 51 of the busbar misassembly prevention structure according to the first embodiment. The section 51A is provided.
The relief portion 51A of the second embodiment has a rectangular shape whose upper side is opened by projecting 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 to be slightly larger than the plate thickness of the misassembly preventing piece 13A. The right side end surface 59a of the misassembly preventing piece 13A inserted into the relief portion 51A faces the inner side surface of the right rib 61A of the relief portion 51A. The left side end surface 59b of the misassembly preventing piece 13A faces the inner side surface of the left rib 61B of the relief portion 51A.

In addition, the pair of ribs 61A and 61B in the escape portion 51A of the second embodiment contacts the left and right end surfaces 79a and 79b of the anti-rotation piece 77 to prevent the anti-rotation portion 62 that anti-rotates the rear assembled bus bar 21A. Also serves as.

Therefore, according to the busbar misassembly prevention structure according to the second embodiment described above, the misassembly prevention piece 13A has the preassembled stacking portion 23 of the preassembled busbar 19A assembled on the lower side in the predetermined stacking order. When they are stacked and assembled, they hang downward from the path of the rear assembled bus bar 21A assembled on the upper side, and therefore do not interfere with the rear assembled bus bar 21A assembled on the upper side. Further, the misassembly preventing piece 13A formed on the preassembled bus bar 19A assembled on the lower side is housed in the relief section 51A of the assembly section 17A, so that the misassembly preventing piece 13A interferes with the assembly section 17A. Can be avoided.

On the other hand, the erroneous assembly preventing piece 13A is assembled on the upper side when the preassembled stacking portion 23 of the preassembled bus bar 19A which should be assembled on the lower side is stacked and assembled in a stacking order different from the predetermined stacking order. The rear assembly bus bar 21</b>A that is supposed to be installed is disposed in the rear assembly portion 37. In other words, the pre-assembled bus bar 19A that should be assembled to the lower side has the rear assembled bus bar 21A that should be assembled to the upper side when the rear assembled bus bar 21A that should be assembled to the upper side is already assembled. It interferes with and becomes impossible to assemble.

Therefore, in the pre-assembled bus bar 19A that should be assembled on the lower side, when the post-assembled bus bar 21A has already been assembled in a stacking order different from the predetermined stacking order, the misassembly preventing piece 13A has the post-assembled bus bar 21A. It interferes with and becomes impossible to assemble.
Accordingly, the busbar misassembly preventing structure according to the second embodiment is similar to the busbar misassembly preventing structure according to the first embodiment described above, in which the preassembled busbar 19A and the postassembled busbar, which are plate-shaped wiring members, are connected to each other. It is possible to physically prevent an error in the assembly procedure with respect to the fastening with 21A. As a result, it is possible to prevent human mistakes in the assembly procedure and prevent the outflow of defective products.

Further, according to the busbar misassembly preventing structure according to the second embodiment, the rear assembly busbar 21A, which is assembled on the upper side and provided with the whirl-stop piece 77, is tightened together with the preassembly busbar 19A, which is assembled on the lower side. When this happens, torque is applied to the rear assembly portion 37. At this time, the rear assembly busbar 21A rear assembly portion 37 to be assembled on the upper side tries to rotate in the tightening direction around the axis 53 of the bolt 15, but the anti-rotation piece 77 is locked by the anti-rotation portion 62. Torque will be received. As a result, the rear assembly bus bar 21A assembled on the upper side is prevented from rotating together even when a strong torque is applied.

In the busbar misassembly preventing structure according to the second embodiment, the pair of ribs 61A and 61B lock the escape portion 51A for receiving the misassembly preventing piece 13A of the preassembled busbar 19A and the rotation stopping piece 77. It also serves as a whirl-stop portion 62 for whirl-stopping the rear-assembled bus bar 21A. Of course, the present invention is not limited to this, and in addition to the configuration including the misassembly prevention piece 13 and the escape portion 51 of the preassembled busbar 19 in the busbar misassembly prevention structure according to the first embodiment, You may separately provide the structure which consists of the rotation stop piece 77 and rotation stop part 62 of the rear assembly bus bar 21A.

Therefore, according to the busbar erroneous assembly prevention structure of the present embodiment, it is possible to physically prevent an erroneous assembly procedure between the busbars.
The present invention is not limited to the above-described embodiments, and the configurations of the embodiments may be combined with each other, or may be modified and applied by those skilled in the art based on the description in the specification and well-known techniques. The invention is planned and is included in the scope of protection required.
For example, in the configuration example of the above embodiment, the case where the number of plate-shaped wiring members is two has been described, but the number of plate-shaped wiring members may be three or more, for example.

Here, the features of the embodiment of the busbar misassembly preventing structure according to the present invention described above will be briefly summarized and listed below in [1] to [4].
[1] Fastening members (bolts 15) that have overlapping portions (the pre-assembled overlapping portion 23 and the post-assembled overlapping portion 37) and that are overlapped in a predetermined predetermined stacking order pass through these overlapping portions. ) A plurality of plate-shaped wiring members (pre-assembled bus bars 19, 19A and rear-assembled bus bars 21, 21A), which are fastened together by
The plate-shaped wiring member on the upper side, which is formed on a part of the plate-shaped wiring member (the pre-assembled busbars 19 and 19A) to be assembled on the lower side, and is misassembled on the lower side in a stacking order different from the predetermined stacking order. (13, 13A) erroneous assembly preventing piece that hangs down at a position that overlaps with (reassembled busbars 21, 21A),
The erroneous assembly preventing piece of the lower plate-shaped wiring member, which is provided in an assembly portion (17, 17A) to which the plurality of plate-shaped wiring members are assembled and is assembled on the lower side in the predetermined stacking order. A relief unit (51, 51A) that accepts
A structure for preventing misassembly of a bus bar, which is characterized by including.
[2] The relief portion (51) is recessed in a side wall (55) of the assembly portion parallel to the axis line (53) of the fastening member, and both side end surfaces (59a, 59b) of the misassembly preventing piece. ). The busbar misassembly preventing structure according to the above [1], characterized in that it has an inner surface (61a, 61b) facing the recess.
[3] A terminal mounting part (33) is provided at the other end of the plate-shaped wiring member (pre-assembled bus bar 19, 19A) having the stack part (pre-assembled stack part 23) at one end. The structure for preventing wrong assembly of the bus bar according to [1] or [2].
[4] A whirl-stop piece (77) formed on a part of the plate-shaped wiring member (post-assembled bus bar 21A) assembled on the upper side,
A whirl stop portion (62) provided in the assembly portion (17A) for locking the whirl stop piece to prevent the upper plate-shaped wiring member from whirling.
The busbar erroneous assembly prevention structure according to any one of the above [1] to [3].

13... Mis-assembly preventing piece 15... Bolt 17... Assembly part 19... Pre-assembled bus bar (plate-shaped wiring member assembled to the lower side)
21... Rear assembled bus bar (plate-shaped wiring member assembled on the upper side)
23... Pre-assembled overlapping part (overlap part)
37... Rear assembled lapped part (lapped part)
51... Relief 53... Axis 55... Sidewall 63... Seat 73... Placement surface 75... Seat d... Minimum clearance

Claims (4)

Each of the stacked portions, each of which has a stacked portion and is stacked in a predetermined stacking order, is a plurality of plate-shaped wiring members that are fastened together by fastening members penetrating these stacked portions,
An erroneous assembly formed on a part of the plate-like wiring member to be assembled on the lower side, and hanging down at a position overlapping with the upper plate-like wiring member erroneously assembled on the lower side in a stacking order different from the predetermined stacking order. With a sticking prevention piece,
A relief portion provided in an assembly portion to which the plurality of plate-shaped wiring members are assembled, and receiving the erroneous assembly prevention piece of the lower plate-shaped wiring member that is assembled on the lower side in the predetermined stacking order. ,
A structure for preventing misassembly of a bus bar, which is characterized by including. 2. The relief portion is provided in a recess in a side wall of the assembling portion parallel to the axis of the fastening member, and has an inner surface of a recess facing both end surfaces of the misassembly preventing piece. Busbar mis-assembly prevention structure described in. 3. The busbar misassembly preventing structure according to claim 1, wherein a terminal mounting portion is provided at the other end of the plate-shaped wiring member having the overlapping portion at one end. A whirl-stop piece formed on a part of the plate-like wiring member assembled on the upper side,
A whirl stop portion provided in the assembly portion, which locks the whirl stop piece to prevent the upper plate-shaped wiring member from whirling.
The busbar misassembly preventing structure according to any one of claims 1 to 3, further comprising:

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