JPH1080040A - Grounding structure of electrical connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the production cost and improve insulating capability of a grounding side bus bar. SOLUTION: An electrical connection box is made up of a Junction Block(J/ B) body 7, a connector block 8 to be jointed to the J/B body 7 and a lower casing 10 which stores the block 8 to be fitted to the J/B body 7. A positive side circuit 6 is provided on the J/B body 7, a grounding side bus bar 9 is provided on the block 8 and a second bus bar 11 to be connected to the first bust bar 9 is provided on the lower casing 10. A screw stand 54 and a bus bar passing hole 59 are provided on the lower casing 10, the one end 57 of the second bus bar 11 is inserted into the lower casing through the passing hole and then, the second bus bar, the first bus bar and the block 8 are unitedly fixed with a screw onto the screw stand. A mounting part 62 for one end 70 of the second bus bar 11 and a bus bar crossarm 76 that can freely be opened and shut are provided on the mounting bracket 60 of the lower casing 10. By forming a biting protrusion for a mounting panel on the other end of the second bus bar, the painting of the mounting panel may be omitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to reduce the cost and improve the electrical insulation of the ground bus bar by dividing the ground bus bar and arranging it separately from the plus side circuit. The present invention relates to an earth structure of an electric connection box.

[0002]

2. Description of the Related Art FIGS. 8 and 9 show a conventional earth structure of an electric junction box described in Japanese Patent Application Laid-Open No. 7-272607. The electric connection box 91 includes a junction block main body (J / B main body) 93 having a plurality of connector portions 92 and a bus bar 9 mounted on the J / B main body 93.
4, a relay (not shown) fitted to the connector portion 92, and an upper cover and a lower cover (not shown) for the J / B body 93.

The bus bar 94 includes a substantially L-shaped ground portion 96 connected to one end of a main body 95 extending in the horizontal direction.
The main body 95 includes a plurality of joint terminals 97 provided at equal intervals. The ground portion 96 is disposed on the outer surface of the mounting bracket 98 of the J / B main body 93, and is connected and fixed to a vehicle body panel or the like with a bolt (not shown). Further, the joint terminal 97 is located in the connector portion 92,
Connect to the relay. The plurality of relays are jointed by a bus bar 94, and the grounding is performed at a ground portion 96.

However, in the above-mentioned conventional earth structure of the electric junction box, the bus bar 94 is large and complicated in shape, so that the yield is low and the cost is high. Also,
The mounting workability to the J / B main body 93 was also poor. Furthermore, since the joint absorbing portion (97) of the bus bar 94 and the vehicle mounting portion (96) are integrated, the blank type of the bus bar 94 can be changed depending on the type of the vehicle or when the mounting portion on the vehicle side is changed. Significant design changes with changes were required.

FIG. 10 shows a ground structure of another conventional electric connection box. A plus circuit 101 of a bus bar and a ground circuit 102 are arranged in parallel on a laminated circuit board 100 via an insulating wall 103. . The plus circuit 101 is a fusible link upstream circuit, a fuse load side circuit, or the like.

In this structure, the plus circuit 101 and the earth circuit 102 are insulated by the insulating wall 103.
For example, when used in an engine room or the like, there is a high risk of short-circuiting if not sufficiently waterproofed, and this structure alone is insufficient for insulation.

[0007]

SUMMARY OF THE INVENTION In view of the above, the present invention can reduce the cost of the bus bar for grounding, improve the workability of mounting the bus bar, and can easily change the mounting side of a vehicle or the like. It is an object of the present invention to provide a grounding structure of an electric connection box which can cope with the above and can improve the electric insulation.

[0008]

To achieve the above object, the present invention provides a J / B main body, a connector block joined to the J / B main body, and a housing for accommodating the connector block. In the electric connection box composed of a lower case fitted to the main body, a circuit on the plus side is arranged on the J / B main body,
A grounding structure is basically provided in which a first busbar on the ground side is provided in the connector block, and a second busbar connected to the first busbar is provided in the lower case. A screw base and a busbar insertion hole are provided in the lower case, and one end of the second busbar is inserted into the lower case from the busbar insertion hole, and the second busbar and the second busbar are inserted on the screw base. One bus bar and the connector block are integrally fixed by screws. Further, the mounting bracket for the lower case is provided with a mounting portion for the other end of the second bus bar and a bus bar presser that can be opened and closed. Further, a biting projection for the mounting-side panel may be formed at the other end of the second bus bar so that the painting of the mounting-side panel can be eliminated.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of a ground structure of an electric junction box according to the present invention.

The electric junction box 1 includes a junction block main body (J / B main body) 7 to which fusible links (FL) 2 and 3, a fuse 4, a relay 5, and a bus bar 6 as a plus side circuit are mounted. / B main body 7, a connector block (relay block) 8 which is integrated from below, a first bus bar 9 for grounding mounted on the connector block 8, and the connector block 8 are housed therein.
And a second bus bar 11 for grounding, which is attached to the lower case 10 and is connected to the first bus bar 9.

The J / B body 7 is formed of an insulating resin, and has a short relay bus bar 14 connected to one terminal 12 of the power supply FL 2 and a long positive bus bar 6 connected to the other terminal 13. It has. Relay bus bar 14
Is formed with a bolt hole 15 for connecting a power supply line, and a hollow guide hole 16 is formed below the bolt hole 15. The bus bar 6 on the positive side is an example for a joint, and a positive circuit other than the bus bar 6 can be configured.

As shown in FIG. 2, the bus bar 6 on the positive side has a connecting portion 17 for the terminal 13 of the FL 2, a connecting portion 19 for the connector portion 18 of the connector block 8, and a plurality of fusible links 3 and fuses 4. It has connection parts 20 and 21 for each one terminal (not shown).
In the J / B main body 7, insertion holes 22 for a plurality of relays 5 are formed, and a plurality of split connectors 23 are formed in the insertion holes 22. The guide rails 2 on the side walls 24 and 25 of the lower case 10 are provided at the lower part of the J / B main body 7.
6 and a locking arm 29 for the engaging projection 28 are formed.

The connector block 8 includes a board portion 31 made of insulating resin and a connector portion 1 erected on the board portion 31.
8, 32 to 34. Each connector section 18,3
Terminals (not shown) are accommodated in 2 to 34, and the terminals are connected to electric wires 36, and the electric wires 36 are bundled to form a wire harness 37. A power supply line 38 is routed in the wire harness 37. The connector parts 33 and 34 are J /
It is connected to the other terminal of FL 3 and fuse 4 on B body 7 side (terminals not on bus bar 6 side). In addition, connector part 3
2 is combined with the split connector 23 to constitute each connector for the relay 5.

The first bus bar 9 includes a connector block 8
Is mounted on the back surface side of the substrate portion 31 of the first embodiment. A female-female terminal 40 is accommodated in the connector portion 32, and a concave cutout groove 41 and a central bolt insertion hole 43 in a bottom wall 42 of the cutout groove 41 are formed on the surface side of the substrate portion 31. .

The first bus bar 9 has female-to-female terminals 40.
A male tab terminal 44 for connection to the notch is provided upright, and a substantially rectangular connecting terminal portion 45 in the horizontal direction is formed on the back side of the bottom wall 42 of the cutout groove 41. The connection terminal portion 45 has a bolt insertion hole 46 formed therein. The connecting terminal portion 45 is connected to a substantially U-shaped bus bar main body 47 by a step portion 48.
And the connection terminal 45 is joined to the back surface of the bottom wall 42 in a state where the bus bar main body 47 is joined to the back surface of the board portion 31.

The notch groove has a depth such that the bolt head does not protrude beyond the surface of the substrate after the bolt is tightened, and has a shape that facilitates picking up of the tool according to the external shape of a tightening tool such as a box wrench. It is formed.

The male tab terminal 44 of the first bus bar 9 is female-
The female terminal 40 is connected to a ground terminal such as the relay 5 on the J / B main body 7 side. The shape of the first bus bar 9 is not limited to the shape shown in FIG. 1, and is appropriately set according to the position of the relay 5, the FL3, and the like. Note that it is also possible to integrally form the female-female terminals on the first bus bar 9 and abolish the female-female terminals 40 in the connector portion 32. The board portion 31 has a slide engagement portion 49 for the guide rail 26 of the lower case 10 and a guide hole 52 for the bolt pedestal 50.

The lower case 10 is formed of an insulating resin, and the bottom wall 53 is provided with the columnar bolt pedestal 50 and the columnar nut pedestal (screw pedestal) 54 for the connection terminal portion 45 of the first bus bar 9. Have been. The bolt pedestal 50 is connected to each of the guide holes 52, 1 of the connector block 8 and the J / B body 7.
6, the bolt 51 at the tip is connected to the hole 1 of the relay bus bar 14.
5 and the bolt 51 is connected to the terminal 5 of the power line 38.
7 is fixed with a nut 58, and the power supply line 38 is connected to the FL 2 via the relay bus bar 14.

The nut pedestal 54 is integrally formed so as to protrude from the bottom wall 53, and has a nut 55 embedded in the upper center. In the side wall 24 of the lower case 10, a horizontal slit-shaped bus bar insertion hole 59 into which the second bus bar 11 can be inserted is formed along the upper end surface 54a of the nut base 54.

On both sides of the side wall 24, mounting brackets 60, 61 for mounting to the vehicle body panel are integrally erected, and one bracket 60 has a mounting groove (in the height direction) for the second bus bar 11. A mounting portion 62 is formed. The bracket 60 has a seat 63 in contact with the vehicle body panel above the insertion groove 62, and a bolt hole 64 in the center of the seat 63. In addition, the reinforcing rib 65 continuous below the side wall 24 includes:
A horizontal slit-shaped notch 66 through which the second bus bar 11 can be inserted is formed.

The second bus bar 11 has a horizontal connecting terminal 67 which enters the lower case 10 through the insertion hole 59, and extends in a direction orthogonal to the connecting terminal 67, and is inserted into the notch 66 of the rib 65. A vertical portion 69 extending vertically from the horizontal portion 68 and engaging with the mounting groove 62 of the bracket 60, and a ground terminal portion 70 formed at the distal end of the vertical portion 69. Is done.

A bolt hole 71 for the nut 55 of the nut pedestal 54 is formed in the connecting terminal 67 so that the vertical
9 includes a step 72 with respect to the seat 63 of the bracket 60.
, And a bolt hole 73 of the ground terminal portion 70 is formed. The second bus bar 11, the connection terminal portions 67 and 45 of the first bus bar 9, and the bottom wall 42 of the notch groove 41 of the connector block 8 are fixed to the nut pedestal 54 with bolts 80.

At one end of the bracket 60, an integral lid-shaped bus bar retainer 76 is provided via a thin hinge 75 so as to be freely opened and closed. The bus bar retainer 76 is formed with a frame-shaped projection 77 that can be engaged with the mounting groove 62.
At 7, the vertical portion 69 of the second bus bar 1 can be pressed against the wall surface of the mounting groove 62. A locking frame piece 78 is formed at the side end of the bus bar retainer 76, and the locking frame piece 7 is attached to the bracket 60.
8 is formed with an engagement projection 79.

The second bus bar 11 is externally attached to the lower case 10 and is stably held by the bus bar retainer 76. With the bus bar retainer 76 locked by the locking means 78, 79,
The bolt hole 71 of the connection terminal 67 of the second bus bar 11 is located on the screw hole 56 of the nut 55 of the nut pedestal 54.
Bracket 60 and ground terminal 70 of second bus bar 11
Is fixed to the vehicle body panel with bolts 81.

A bolt pedestal (screw pedestal) (not shown) is provided in place of the nut pedestal 54, and bolts (not shown) of the bolt pedestal are inserted into the holes 71, 46 of the bus bars 11, 9 and the hole 43 of the connector block 8. And a structure in which the nut is inserted and fastened with a nut. In this case, the connection terminal portion 67 of the second bus bar 11 is inserted into the insertion hole 59 of the lower case 10 and then swings toward the bolt, and the hole 71 of the connection terminal portion 67 is rotated.
Bolts need to be inserted into In the case of the nut pedestal 54, the connecting terminal portion 67 is inserted into the insertion hole 59, and at the same time, the vertical portion 69 is engaged with the mounting groove 62, so that assembly is extremely easy.

FIGS. 3 and 4 show a state in which the connecting terminal 67 of the second bus bar 11 is connected to the connecting terminal 45 of the first bus bar 9 on the nut base 54 of the lower case 10.

That is, by inserting the connecting terminal 67 of the second bus bar 11 into the insertion hole 59 of the lower case 10 in FIG. 1, the connecting terminal 67 is joined to the upper end surface 54 a of the nut base 54. The first bus bar 9 is arranged along the back surface of the connector block 8, and its connection terminal 45 is joined to the connection terminal 67 of the second bus bar 11. Both connecting terminal portions 45,
67 is connected between the nut 55 and the bottom wall 42 of the cutout groove 41 of the connector block 8 by bolts 80. At the same time, the connector block 8 and the lower case 10 are joined and fixed by the bolts 80.

FIGS. 5 and 6 show a state in which the second bus bar 11 arranged on the bracket 60 of the lower case 10 is connected to a vehicle body panel (mounting side panel) 82. The vertical portion 69 of the second bus bar 11 is
And the ground terminal 70 is screwed into the bolt 81 and the nut 83 on the body panel 82 side so that the bracket 60 and the body panel 82
And is securely grounded to the body panel 82.

FIG. 7 shows a modification of the connection structure between the second bus bar 11 and the vehicle body panel 82.

In this structure, a plurality (four in this example, equally spaced) of projections 85 are formed on the body panel 82 on the periphery of the bolt hole 73 'of the ground terminal portion 70' of the second bus bar 11 '. In addition, the coating 82a on the surface of the body panel is shaved by the biting projection 85 so that a reliable electrical connection with the body panel 82 is performed. That is, bolt 8
As the nut 1 is screwed into the nut 83, the engagement protrusion 85
Is crushed and bites into the body panel 82, penetrating through the coating 82 a and coming into contact with the body panel 82.

As described above, according to the present embodiment, the first bus bar 9 serving as the ground circuit is provided on the connector block 8 and the second bus bar 11 is provided on the lower case 10 separately. The busbar is divided into two parts for miniaturization and simplification, reducing the cost of mold materials, etc.
The manufacturing cost can be reduced, the connection reliability can be improved, and the workability of mounting the bus bar can be improved. Further, when the mounting portion on the vehicle side is changed, only the shape and the like of the second bus bar 11 need be changed, so that the cost can be reduced. Further, since the bus bar 6 on the plus circuit side is provided on the J / B main body and is located far away from the bus bars 9 and 11 on the ground side, even if there is intrusion of rainwater or the like, both circuits 6 and 9, 11 is sufficiently maintained. Lower case 10
The busbar insertion hole 59 is slit-shaped, and almost no gap is formed after the insertion of the busbar, so that the intrusion of water is reliably prevented.

[0032]

As described above, according to the first aspect of the present invention, since the first bus bar and the second bus bar for grounding are divided, the shape of the bus bar is simplified, and the molding is facilitated to reduce the height. The cost is increased, and the assemblability to the connector block and the lower case is improved. In addition, since the ground side bus bar and the plus side circuit are arranged separately, insulation is improved. According to the second aspect, the connector block and the lower case are fixed at the same time as the connection between the first bus bar and the second bus bar, and the workability of assembling the electric connection box is improved. According to claims 2 and 3, one end of the second bus bar is inserted into the insertion hole, the other end is set in the mounting portion and the bus bar retainer is closed, so that the second bus bar can be easily inserted into the lower case. Can be installed. According to claim 3,
Even when the mounting side of the vehicle or the like is changed, it can be easily coped with by changing only the second bus bar. According to the fourth aspect, the mounting bracket is fixed to the mounting side panel by bolts, and at the same time, the biting projections of the second bus bar scrape off the coating on the mounting side panel, so that the electrical connection between the second bus bar and the mounting side panel is reduced. The contact is reliably performed, and the grounding performance is improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a grounding structure of an electric junction box according to the present invention.

FIG. 2 is a perspective view showing a bus bar on the plus circuit side mounted on the J / B main body.

FIG. 3 is a plan view showing a connection structure between a first bus bar and a second bus bar.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a front view showing a connection structure of a second bus bar to a mounting side panel.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

FIG. 7 is a longitudinal sectional view showing a modification of the connection structure of the second bus bar.

FIG. 8 is an exploded perspective view showing a conventional example.

FIG. 9 is a longitudinal sectional view showing the assembled state.

FIG. 10 is a perspective view of a main part showing another conventional example.

[Explanation of symbols]

 6 plus side bus bar 7 J / B body 8 connector block 9 first bus bar 10 lower case 11, 11 'second bus bar 43 bolt hole 45, 67 connecting terminal 54 nut pedestal (screw pedestal) 59 bus bar insertion hole 60 bracket 62 Mounting groove 70, 70 'Ground terminal part 76 Bus bar holder 82 Vehicle body panel (mounting side panel) 85 Engagement protrusion

Claims (4)

[Claims] 1. An electric connection box comprising a J / B main body, a connector block joined to the J / B main body, and a lower case that accommodates the connector block and fits into the J / B main body. , A plus side circuit is arranged in the J / B body,
A ground structure for an electric connection box, wherein a first bus bar on the ground side is disposed on the connector block, and a second bus bar connected to the first bus bar is disposed on the lower case. 2. A screw base and a bus bar insertion hole are provided in the lower case, and one end of the second bus bar is inserted into the lower case through the bus bar insertion hole, and the second bus bar is inserted on the screw base. The earth structure of an electric junction box according to claim 1, wherein said first bus bar and said connector block are integrally fixed by screws. 3. The mounting bracket for the lower case is provided with a mounting portion for the other end of the second bus bar and a bus bar presser that can be freely opened and closed.
Ground structure of the electrical junction box described. 4. The electrical connection according to claim 3, wherein a biting projection for the mounting-side panel is formed at the other end of the second bus bar so that the coating of the mounting-side panel can be eliminated. Box ground structure.