JPH11111355A - Connecting structure of terminal and bus bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost, while fitting a terminal to a bus bar by bolting without the use of a nut by forming a bus bar with a screw hole with pressing, and passing a screw part of a bolt into a hole of a terminal, and threading the screw part with the screw hole. SOLUTION: In connecting an LA terminal to a first layer bus bar 21 of an electrical connection box 10, an LA terminal 31 is overlapped with a bus bar 21 exposed in the inside of a terminal connecting part 13, and a screw part of a bolt 3 is threaded with a screw hole 21a formed in the first layer bus bar 21. With this structure, the LA terminal 31 can be surely connected to the first layer bus bar 21. A nut for fastening a bolt is eliminated, and a structure for preventing turning of nut is eliminated in a lower cover 11 side. The lower cover 11 side can be formed by merely providing a space for receiving a screw part of the bolt 3. As a material for the bolt, material having high conductivity such as brass is desirably used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a terminal having holes (hereinafter referred to as an LA terminal) and a bus bar.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Laid-Open Publication No. Hei 6-62466, generally, when an LA terminal is connected to a bus bar set in an electric junction box, FIG.
As shown in (b), the LA terminal 2 is superimposed on the bus bar 1,
The shaft of the bolt 3 is passed through the hole 2 a of the LA terminal 2 and the hole 1 a of the bus bar 1, and is connected by screwing to a nut 4 behind the bus bar 1. In this case, as the nut 4 previously set behind the bus bar 1, an insert nut integrated at the time of molding the housing of the electric connection box, or an outsert nut incorporated later is used.

[0003]

However, if the nut 4 is used as a fastening partner of the bolt 3 as in the prior art, the cost of the nut alone is increased, the rotation of the nut is required, and the housing of the electric connection box is required. The structure becomes complicated,
There is a problem that the molding cost increases.

[0004] The present invention has been made in view of the above circumstances, and has as its object to provide a connection structure between a terminal and a bus bar which can reduce costs by eliminating a nut.

[0005]

According to a first aspect of the present invention, in a structure in which a terminal having a hole is connected to a bus bar using a bolt, a screw hole is formed in the bus bar by pressing, and a bolt hole is formed in the hole of the terminal. The terminal is connected to the bus bar by screwing the screw portion into the screw hole through the screw portion.

In this structure, the terminal can be bolted to the bus bar without using a nut by forming the screw hole together with the bus bar during press working.

According to a second aspect of the present invention, in the first aspect, the screw hole is formed by a punched hole except a plurality of projecting pieces which engage with the screw groove of the bolt on the inner peripheral edge. And

In this structure, a plurality of protrusions are left on the peripheral edge of the through-hole at the time of punching by a press, so that screws can be screwed. Therefore, it can be processed by simple punching.

According to a third aspect of the present invention, in the first or second aspect, a plurality of the busbars are stacked, and a screw portion of the bolt is screwed into the screw hole formed in each busbar, thereby forming an interlayer connection between the busbars. Is performed.

In this structure, the bus bars are connected at the same time by the bolts connecting the terminals to the bus bars. Therefore, a dedicated terminal or the like for interlayer connection is not required, and the connection of the terminal and the interlayer connection of the bus bar circuit can be performed at the same place, so that the structure can be simplified.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the bolt is made of a brass material.

In this structure, since the conductivity of the bolt is good, circuit connection through the bolt can be effectively performed.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

First, the connection structure of the first embodiment will be described with reference to FIGS. FIG. 1 shows a configuration of an electric junction box to which the connection structure of the first embodiment is applied, where (a) is a plan view,
(B) is a sectional view taken along the line Ib-Ib in (a). FIG.
(A), (b) is sectional drawing which shows the procedure of connection of LA terminal.

As shown in FIG. 1, the housing of the electric junction box 10 includes a lower cover 11 and an upper cover 12, and has a first layer bus bar 21 and a second layer bus bar 22 therein.
Are stored in a stacked state. A terminal connection portion 13 with a protective wall is provided at a predetermined position of the upper cover 12, and a screw hole 21 is provided at a corresponding position of the first-layer bus bar 21.
a is formed. This screw hole 21a is
And a plurality of sheets (4 in this example) engaged with the screw groove of the bolt on the inner peripheral edge at the same time as the press forming.
).

The first layer bus bar 21 of the electric junction box 10 has L
To connect the A terminal, as shown in FIG.
The terminal 31 is placed on the bus bar 21 exposed in the terminal connecting portion 13 and the screw portion of the bolt 3 is passed through the hole of the LA terminal 1 from above as shown in FIG. Then, the screw portion is screwed into a screw hole 21 a formed in the first layer bus bar 21. Thereby, the LA terminal 31 can be reliably connected to the first-layer bus bar 21.

Therefore, a nut for tightening the bolt is not required, and the structure for preventing the nut from rotating is provided by the lower cover 11.
It is not necessary to provide it on the side. A space for simply receiving the screw portion of the bolt 3 may be provided on the lower cover 11 side. In this case, the second-layer bus bar 22 has a non-contact relationship with the bolt 3.

FIGS. 3A and 3B show the structure of an electric junction box to which the connection structure of the second embodiment is applied, wherein FIG. 3A is a plan view, and FIG. 3B is a sectional view taken along the line IIIb-IIIb of FIG. Also,
FIGS. 4A and 4B are cross-sectional views showing the procedure for connecting the LA terminals.

In the electric connection box 10 B of this embodiment, the first layer bus bar 2 is provided between the lower cover 11 and the upper cover 12.
1, a second-layer bus bar 22 and a third-layer bus bar 23 are accommodated in a stacked state. In the third layer bus bar 23, at the same position as the screw hole 21 a of the first layer bus bar 21,
A screw hole 23a having a projection 23b is formed in a similar manner.

In order to connect the LA terminals to the first-layer bus bar 21 and the third-layer bus bar 23 in the electric connection box 10B, as shown in FIG. 4b, the screw portion of the bolt 3 is passed through the hole of the LA terminal 1 as shown in FIG. It is screwed into a screw hole 21 a formed in the layer bus bar 21 and further screwed into a screw hole 23 a of the third layer bus bar 23. Thereby, the LA terminal 31 is connected to the first layer bus bar 21 and the third layer bus bar 21.
Can be connected to the layer bus bar 23,
The layer bus bar 21 and the third layer bus bar 23 can be interconnected. In this case, the LA terminal 3
1 and the third-layer bus bar 23 are electrically connected, and the first-layer bus bar 21 and the third-layer bus bar 23 are electrically connected. Therefore, the material of the bolt 3 is a material having high conductivity such as a brass material. It is desirable to adopt.

In the case of this embodiment, a nut for connecting the LA terminal 31 to the bus bars 21 and 23 can be eliminated, and a dedicated terminal for connecting the bus bars 21 and 23 between layers can be eliminated. can do.

[0022]

As described above, according to the first aspect of the present invention, since the terminal can be bolted to the bus bar without using a nut, the cost can be reduced because the nut is not used. In addition, since the structure for preventing the rotation of the nut is not required, the structure of the housing can be simplified, and the molding cost of the housing can be reduced.

According to the second aspect of the present invention, the following effect can be obtained in addition to the effect of the first aspect of the present invention. That is, since a screw hole corresponding to a nut is formed by punching with a press, it can be easily processed at the time of forming a bus bar.

According to the invention of claim 3, according to claim 1 or 2,
The following effects are obtained in addition to the effects of the present invention. That is, since the bus bars are connected at the same time by the bolts connecting the terminals to the bus bar, a dedicated terminal for interlayer connection is not required, and the terminal connection and the interlayer connection of the bus bar circuit are performed at the same place. Can be. Therefore, the structure can be simplified and the cost can be reduced.

According to the invention of claim 4, in addition to the effect of any one of claims 1 to 3, the following effect is obtained. That is, since the conductivity of the bolt is good, electrical connection through the bolt can be effectively performed. Therefore, when the terminal and the bus bar cannot be directly overlapped, particularly when the bus bar is connected between layers by bolts, the connection loss can be reduced.

[Brief description of the drawings]

1A and 1B are configuration diagrams of an electric junction box to which a first embodiment of the present invention is applied, wherein FIG. 1A is a plan view and FIG.
It is Ib arrow sectional drawing.

FIGS. 2A and 2B are explanatory views of the first embodiment of the present invention, in which FIG. 2A is a cross-sectional view showing a state where an LA terminal is about to be connected to a bus bar in the electric connection box of FIG. 1, and FIG. It is sectional drawing which shows the state which performed.

3A and 3B are configuration diagrams of an electric junction box to which the second embodiment of the present invention is applied, where FIG. 3A is a plan view and FIG. 3B is a diagram III in FIG.
It is b-IIIb arrow sectional drawing.

FIGS. 4A and 4B are explanatory views of a second embodiment of the present invention, wherein FIG. 4A is a cross-sectional view showing a state where an LA terminal is about to be connected to a bus bar in an electric connection box, and FIG. FIG.

5A is a perspective view of a conventional example, and FIG. 5B is a cross-sectional view of the conventional example.

[Explanation of symbols]

 3 Bolt 21, 23 Bus bar 21a, 23a Screw hole 21b, 23b Inclined protruding piece 31 LA terminal

Claims (4)

[Claims] In a structure for connecting a terminal with a hole to a bus bar using a bolt, a screw hole is formed in the bus bar by pressing, and a screw portion of a bolt is passed through the hole of the terminal, and the screw portion is connected to the screw hole. A terminal connected to the bus bar by screwing the terminal into the bus bar. 2. The connection structure between a terminal and a bus bar according to claim 1, wherein said screw hole is formed by punching out an inner peripheral edge of the terminal hole, leaving a plurality of protrusions engaged with a screw groove of a bolt. A connection structure between a terminal and a bus bar, comprising: 3. The connection structure between a terminal and a bus bar according to claim 1, wherein a plurality of the bus bars are stacked, and a screw portion of the bolt is screwed into the screw hole formed in each bus bar. A connection structure between the terminal and the bus bar, wherein the bus bar is connected between layers. 4. The connection structure between a terminal and a bus bar according to claim 1, wherein the bolt is made of a brass material.