JP3178379B2 - Electrical junction box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric connection box connected to a wire harness for an automobile. More specifically, the present invention relates to a bus bar housed inside an electric connection box and a terminal of a fuse to be attached to the electric connection box. In particular, a pair of tabs of a bus bar connected to a pair of terminals of a fuse can be disposed so as to face the same layer.

[0002]

2. Description of the Related Art As shown in FIG. 6, a bus bar housed in an electric junction box of this type is connected to a fuse.
Is bent to form a tab 1a, which is connected to a terminal 3a of the fuse 3 via a female-female type relay terminal 2.

When bus bars are alternately stacked and accommodated in an electric junction box and are accommodated in an insulating plate, the bus bars arranged in the same layer are formed of one conductive plate, and one conductive plate is punched into a required pattern. After that, the tab 1a is formed by bending with a press.

[0004]

The electrical junction box is usually
A large number of fuse accommodating portions are formed in parallel. As shown in FIG. 6, a plurality of fuses 3A and 3B are mounted in parallel and connected to the tabs 1a to 1d of the bus bars 1A to 1D of the internal circuit. . In this case, the bus bar provided with the tabs 1a to 1d cannot be formed from one conductive plate.

That is, as shown in FIG. 7, the tabs 1a to 1d
In the unfolded state, the tip of the tab 1c overlaps the base of the tab 1a, and similarly, the tip of the tab 1d overlaps the base of the tab 1b. Therefore, the bus bars 1A and 1B respectively provided with the tabs 1a and 1b connected to the fuse 3A can be formed of the same conductive plate, and similarly, the bus bars 1C and 1D provided with the tabs 1c and 1d respectively connected to the fuse 3B. Can be formed from the same conductive plate, but the bus bars 1A and 1B and the bus bar 1C1D need to be formed from different conductive plates.

As shown in FIG. 8, bus bars 1A,
When tabs 1a and 1b are formed by bending the tip of 1B vertically, tabs 1a and 1b overlap in an expanded state.
The bus bars 1A and 1B cannot be punched from one conductive plate. That is, a bus bar having a tab connected to one fuse must also be formed from another conductive plate.

The bus bars formed of the above-mentioned different conductive plates are arranged in different layers, or one of them is arranged in the same layer as a post-insert bus bar.

As described above, when the bus bar having the tabs connected to the juxtaposed fuses is formed of another conductive plate, there is a problem that the yield of the conductive plate is reduced and the cost is increased. Also, if busbars with tabs to connect to juxtaposed fuses are arranged in different layers, circuit design will be severely restricted, high-density wiring inside the electrical junction box will not be possible, and the electrical junction box will be large. Easy to convert. On the other hand, when the post-insertion bus bar is used, there is a problem that the number of steps for assembling the electric connection box increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an improved relay terminal for connecting a tab formed on a bus bar to a terminal plate of a fuse, and has a tab for connecting to a terminal of a juxtaposed fuse. It is an object of the present invention to form a bus bar from a single conductive plate by punching, and to be able to face the same layer in the same layer.

[0010]

In order to solve the above-mentioned problems, the present invention is directed to a first aspect of the present invention, wherein a bus bar housed in a case and a fuse fitted to a fuse mounting portion formed on the outer surface of the case are relayed. In the electric connection box connected by using the terminal, the relay terminal is provided on the upper and lower sides of the vertical board portion, the first female terminal portion for fitting the terminal of the fuse and the second tab for fitting the tab formed on the bus bar. A female terminal portion is formed, and a direction in which the fuse terminal is fitted to the first female terminal portion is set to a direction orthogonal to a direction in which the tab is fitted to the second female terminal portion, and The width of the female terminal portion is larger than the width of the terminal plate of the fuse, and the center line in the width direction of the terminal of the fuse fitted to the first female terminal portion and the tab of the bus bar fitted to the second female terminal portion are fitted. Offset with the combined line And widening the gap of the bus bar tab that, and a fuse that connects with the bus bar provides the electrical connection box, characterized in that in parallel two or more.

Specifically, a pair of curled portions bent from the both sides to the inner side are provided below the board portion of the relay terminal, and a tab insertion space is provided between the board portion and the curled portions on both sides. While the second female terminal portion is provided, the upper end of the pair of bent portions is bent downward from the direction in which the upper ends of the pair of bent portions approach each other after being bent to the inner surface side from both side edges of the board at the upper portion of the board portion. A folded portion is provided, and a first female terminal portion having a tab insertion portion between the folded portions is formed, and the first female terminal portion has a tab fitting direction orthogonal to the second female terminal portion. Item 2).

The left and right terminals of the fuse are connected via the relay terminals to tabs protruding from the opposite end surfaces of the bus bars arranged to face the same layer and connected to the left and right terminals, respectively. Are offset to the outside of each of the left and right terminals via the relay terminal (claim 3).

In this manner, the relay terminal interposed between the tab of the bus bar and the terminal of the fuse is formed in the above-described shape, and the fitting direction of the relay terminal between the tab of the bus bar and the terminal of the fuse to the female terminal portion is orthogonal. By offsetting the position of the terminal of the fuse and the position of the tab of the bus bar, and increasing the distance between the tabs of the bus bar, the opposite bus bar tab can be prevented from overlapping in the expanded state. Therefore, it can be formed from one conductive plate, and can be opposed to the same layer.

[0014]

Further, according to the present invention, since the opposing tab of the bus bar can be formed by being bent perpendicularly from the end of the bus bar, the bus bar connected to the terminal of the fuse in parallel is punched out of one conductive plate in parallel. Can be.
Therefore, the bus bars connected to the parallel fuses can also be arranged on the same layer. As a result, the bus bars constituting the internal circuit of the electric connection box can be arranged at a high density, and the electric connection box can be downsized.

[0016]

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

As shown in FIG. 1, a pair of terminals 11 and 12 of the fuse 10 are connected via relay terminals 13 and 14, respectively.
The tab 16 of the bus bar 15 and the tab 18 of the bus bar 17 are connected. Similarly, a pair of terminal terminals 21 and 22 of the fuse 20 juxtaposed with the fuse 10 are connected to the tab 26 of the bus bar 25 and the tab 28 of the bus bar 27 via the relay terminals 23 and 24, respectively.

The relay terminals 13, 14, 23, and 24 have the same shape. Therefore, the shape of the relay terminal 13 will be described, and the terminals 14, 23, and 24 will be assigned the same reference numerals and description thereof will be omitted. I do.

As shown in FIG. 2, the vertical substrate portion 13
a second female member provided with a pair of curled portions 13b and 13c bent from the both sides to the inner surface side on the lower side of a, and a tab insertion space 13d between the substrate portion 13a and the curled portions 13b and 13c on both sides. A terminal portion 13e is provided. The tab 11 of the bus bar 10 is inserted into the second female terminal 13e from below.

On the other hand, bending portions 13f and 13g are provided on the upper side of the substrate portion 13a from both side edges of the substrate portion to the inner side, and the upper ends of the pair of bending portions 13f and 13g are bent downward from a direction approaching each other. Folded part 13h, 13
i, and a first female terminal portion 13j having a tab insertion portion 13k between the folded portions is formed. The terminal 11 of the fuse 10 is connected to the first female terminal portion 13j from above.
Is inserted, and the width W1 of the first female terminal portion 13j is set to be larger than the width W2 of the terminal 11 of the fuse 10 (W1).
> W2).

As described above, the upper first female terminal 13
The terminal 11 of the fuse 10 is inserted into j, and the fitting direction thereof is set in the X direction. Meanwhile, the tab 16 of the bus bar 15 is inserted into the second female terminal portion 13e, and the fitting direction is changed to Y.
As directions, the first female terminal portion 13j and the second female terminal portion 1
The tab fitting direction of 3e is orthogonal.

The first female terminal 13j is connected to the substrate 13a.
The center line L1 in the width direction of the terminal 11 of the fuse fitted with the first female terminal portion 3j because it protrudes more inward.
Is offset from the fitting line L2 of the tab 16 of the bus bar fitted along the inner surface of the substrate portion 13a as shown in FIG. 3, and the line L2 of the tab 16 of the bus bar has a dimension S
Will be located only outside.

Similarly, the other terminal 1 of the fuse 10
2, the tab 18 of the bus bar 17 is offset and located outside by the dimension S1. This dimension S1 is about 2 mm to 3 mm.

As a result, the terminals 11 and 12 of the fuse 10
The size S2 between the opposed tabs 16 and 18 connected to the fuse 10 via the relay terminals 13 and 14 is smaller than the size S3 between the terminals 11 and 12 of the fuse 10 by S1 × 2 (4 mm to 6 mm).
mm).

Therefore, the tab 16 of the bus bar 15 and the tab 18 of the bus bar 17 do not overlap in the expanded state, as shown in FIG. 4, and can be punched from one conductive plate 30.

Further, the terminals 11 of one fuse 10
Tabs 16 and 18 of bus bars 15 and 17 connecting to 12
Are formed by directly bending vertically and projecting from the opposite ends of the bus bars 15 and 16, and as shown in FIGS. 6 and 7, after being bent in the horizontal direction, bending and projecting vertically. As shown in FIG. 4, the terminals 21 and 22 of the fuse 20 adjacent to the fuse 10 are not used.
Bus bar 25 with tabs 26 to connect to each other, tab 2
The bus bar 27 provided with 8 can also be formed by punching from the same one conductive plate 30 as the bus bars 15 and 17.

As described above, since the bus bars 15, 17, 25, and 27 can be punched from one conductive plate 30, the bus bars 15, 17, 25, and 27 can be electrically connected as shown in FIGS. They can be arranged on the same layer in the case of the junction box.

[0028]

As is apparent from the above description, according to the present invention, the shape of the relay terminal for connecting the terminal of the fuse and the tab of the bus bar is improved, and the first female terminal portions provided on both sides thereof are improved. Since the second female terminal portion is formed so as to be in the orthogonal direction, the fitting direction of the fuse terminal and the tab of the bus bar is set to the orthogonal direction, and the tab of the bus bar is offset from the fuse terminal at a position offset from the fuse terminal. it can. As a result, the interval between the tabs of the opposing bus bars can be increased, so that the bus bar having the opposing tabs can be stamped out of one conductive plate and arranged on the same layer in the electric junction box. .

As described above, the bus bars connected to a pair of terminals of one fuse can be arranged on the same layer, and the bus bars connected to the juxtaposed fuses can be arranged on the same layer. Wiring can be performed efficiently, high-density wiring can be performed, and the size of the electric junction box can be reduced.

Further, since a bus bar having a fuse connection tab can be formed from one conductive plate with high yield,
Cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

2A and 2B show the relay terminal shown in FIG. 1, wherein FIG. 2A is a perspective view seen from one side, and FIG. 2B is a perspective view seen from the other side.

FIG. 3 is a view showing a positional relationship between a tab of a bus bar and a terminal of a fuse connected via the relay terminal.

FIG. 4 is a development view of a bus bar connected to the fuse.

FIG. 5 is a cross-sectional view showing a state where a tab of a bus bar and a terminal of a fuse are connected via a relay terminal.

FIG. 6 is a perspective view showing a conventional example.

FIG. 7 is a development view of the bus bar shown in FIG. 6;

FIG. 8 is a development view of another conventional bus bar.

[Explanation of symbols]

 10, 20 Fuse 11, 12, 21, 22 Terminal 13, 14, 23, 24 Relay terminal 13a Substrate 13e Second female terminal 13j First female terminal 15, 17, 25, 27 Busbar 16, 18, 26, 28 tabs

Claims (3)

(57) [Claims] 1. An electric connection box for connecting a bus bar housed inside a case and a fuse fitted to a fuse mounting portion formed on an outer surface of the case using a relay terminal, wherein the relay terminal is a vertical board. On the upper and lower sides of the portion, a first female terminal portion for fitting the terminal of the fuse and a second female terminal portion for fitting the tab formed on the bus bar are formed, and the above-mentioned first female terminal portion is formed. Assuming that the fitting direction of the fuse terminal is a direction orthogonal to the fitting direction of the tab to the second female terminal, and the width of the first female terminal is larger than the width of the terminal plate of the fuse, the first female The center line in the width direction of the terminal of the fuse to be fitted to the terminal portion is offset from the fitting line of the tab of the bus bar to be fitted to the second female terminal portion, and the interval between the tabs of the opposed bus bar is increased .
Two or more fuses connected to the busbar are connected in parallel.
Electrical connection box, characterized in that is. 2. A pair of curled portions, which are bent from both sides to the inner surface side, are provided below the board portion of the relay terminal, and a tab insertion space is provided between the board portion and the curled portions on both sides. While the two female terminal portions are provided, the upper portion of the substrate is bent toward the inner surface side from both side edges of the substrate portion, and then a folded portion in which the upper ends of the pair of bent portions are curved downward from a direction closer to each other. 2. A first female terminal portion having a tab insertion portion formed between the folded portions, wherein the first female terminal portion has a tab fitting direction orthogonal to the second female terminal portion. Electrical junction box. 3. The left and right terminals of the fuse are connected via the relay terminals to tabs protruding from opposing tip surfaces of the bus bars disposed on the same layer and connected to the left and right terminals, respectively. The electric connection box according to claim 1 or 2, wherein the tabs of the bus bar are offset to the outside of the left and right terminals, respectively, via the relay terminal.