JP2700112B2 - How to change the busbar circuit - 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 junction box used for interconnecting wire harnesses and having a function of forming a branch circuit in a harness in a concentrated manner. The present invention relates to a method of changing a circuit configuration by using a relay terminal used for the above.

[0002]

2. Description of the Related Art As shown in FIG. 7, an electric junction box generally comprises a plurality of busbar wiring boards 33A, 33B and 33C stacked and accommodated in an upper case 31 and a lower case 32.
Each bus bar wiring board is formed by arranging a plurality of bus bars 34 having a desired pattern on one or both sides of an insulating plate 35, and a tab 36 erected and connected to each bus bar is provided on the upper case 31 (or the lower case 32). ) Are provided directly in various connectors such as a wire harness connector 37, a fuse connector 38, and a relay connector 39, or indirectly through a relay terminal (not shown).

The bus bar wiring boards 33A, 33B, 3
The bus bars 34, which are 3C internal circuit conductors, are integrally formed from a single conductive metal plate by pressing and bending in accordance with the vehicle interior circuit such as vehicle type, grade, and destination. If there is a circuit change such as addition of an optional circuit, the circuit design is re-designed for each bus bar group 34 in each layer, and a new press die is required, which is troublesome and costly.

Therefore, Japanese Patent Application Laid-Open No. 61-66386 discloses a method for simplifying a circuit change using a bus bar. This uses two independent bus bars 42A and 42B as shown in FIG. 8 when forming the two circuits (P) and (Q) shown in FIG. The bus bar 42A has a three-branch configuration having connection points 40A, 40B, and 40C, and the bus bar 42B has connection points 40A, 40C.
D, 40E, the connection point groups 40B, 40C and the connection point groups 40D, 40D,
40E is common to the two circuits P and Q and has a connection point 40E.
A is a connection point to the specified wire harness.

[0005] When forming a P circuit, the connection portion of the connection point 40A of one of the bus bar 42B is cut at position 44 ₂ disposed on the insulating plate 35 in combination with the other bus bar 42A, forming a Q circuit when the inverse to cut the connecting portion of the connection point 40A of the bus bar 42A at the position 44 _1, the combination similarly to the bus bars 42B, disposed.

In FIG. 9, reference numeral 41 denotes a relay, and 45 denotes a wire harness. In addition, each connection point 40A, 40
The tabs 36 are erected at B. Each tab is positioned so as to protrude through the same tab insertion hole (not shown) in the same connector (37, 38, 39).

[0007]

Problems to be Solved by the Invention FIGS. 8 and 9
In the circuit forming method shown in FIGS. 7A and 7B, two different circuits P and Q can be formed relatively easily by cutting one of the connection points 40A of the two bus bars 42A and 42B. Although there is an advantage, a step of manufacturing both of them separately and cutting one of them when assembling is required. Therefore, as described with reference to FIG. 7, it is not possible to adopt a process of arranging the bus bars 34 formed integrally from one conductive metal plate as one unit on the one insulating plate 35 as it is, In addition to the extra labor required for assembly, different types of press dies are still required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a method for changing the bus bar circuit very easily without cutting the bus bar or newly providing another bus bar. As an issue.

[0009]

According to a first aspect of the present invention, there is provided a busbar circuit changing method comprising the steps of: setting an input tab connected to a power supply side tab of a fuse; A first bus bar provided, a second bus bar provided with an output tab connected to the load side tab of the fuse, and a third bus bar provided with an output tab opposed to the output tab at a predetermined interval. A bus bar wiring board including a bus bar of
A relay terminal provided with an electric contact portion for electrically connecting tabs inserted from opposite directions to each other, and the electric contact portion further from the electric contact portion via a connecting piece having a length corresponding to the predetermined interval. An input tab of the first bus bar and a second relay terminal using a branch relay terminal having opposing tab receiving portions;
The relay terminals are connected to the output tabs of the bus bars, respectively, and a fuse is interposed between the relay terminals, or the relay terminals are connected to the input tabs of the first bus bar; The branch relay terminal is connected to the output tab of the bus bar, the output tab of the third bus bar is connected to the tab receiving portion of the branch relay terminal, and a fuse is provided between the branch relay terminal and the relay terminal. By inserting, two types of circuits are formed alternatively.

[0010]

According to the method of the present invention, two different circuit configurations can be obtained by selectively connecting a normal relay terminal or a branch relay terminal to the output tab of the second bus bar. Therefore, cutting a part of the busbar,
It is not necessary to use a bus bar of another pattern, and no extra equipment or man-hour is required for assembling the bus bar wiring board, and the circuit can be changed quickly.

[0011]

FIG. 1 is a perspective view of a branch relay terminal used in the present invention, FIG. 2 is a cross-sectional view of the used state, and FIG. 3 is a perspective view of the relay terminal used in the present invention. FIG.
In FIG. 2 and FIG. 2, A indicates a branch relay terminal, e indicates a fuse, and the branch relay terminal A is a branch connection between an electrical contact portion 1 for electrically connecting a tab inserted from the opposite side and another tab. Tab receiving portion 11 for connecting
Coupled by 0.

The electric contact portion 1 includes a fixed contact plate 2 and a first elastic contact plate 4 which is formed by bending one end of the electric contact portion to the other end through a rigid bending portion 3. 4
Is surrounded by an enclosing plate 6 formed via side plates 5 and 5 ′ on both sides of the fixed contact plate 2. A second elastic contact plate 8 is formed at an end of the enclosing plate 6 on the side of the rigid bending portion 3 via a curved portion 7 so as to be opposed to the first elastic contact plate 4.

The tab receiving portion 11 has a second fixed contact plate 12 opposed to the fixed contact plate 2 via the connecting piece 10 at the lower end thereof, and curls both sides thereof inwardly. The length of the connecting piece 10 is determined according to the distance between the pair of opposed tabs d, as will be described later. In the figure, 5a is a tying-fixing plate for holding down the embossed portion 6a recessed inside the enclosing plate 6 from outside,
6b is a tab for preventing erroneous insertion of a tab, and 8a is a second elastic contact plate 8.
The top 9 of the chevron is a regulating piece for preventing the second elastic contact plate 8 from being excessively bent.

As shown in FIG. 2, the branch relay terminal A is connected to the fuse connector b of the case a in the electric connection box.
The tab d of the bus bar c is inserted between the fixed contact plate 2 and the first elastic contact plate 4 from the lower open end, and the first elastic contact plate 4 and the first elastic contact plate 4 are inserted from the upper open end. A tab f, which is a power-supply-side terminal or a load-side terminal of the fuse e, is inserted between the two elastic contact plates 8 and two tabs d,
f can be electrically connected by the contact plates 2, 4, and 8. Further, by inserting a tab d of another bus bar c 'into another tab receiving portion 11, a branch connection becomes possible.

The relay terminal B shown in FIG.
The connection piece 10 and the tab receiving portion 11 are omitted, and the internal structure of the electric contact portion 1 is the same.

In FIGS. 4A and 4B, 14 ₁ , 1
4 _2, ... 14 _5, respectively show a first, second, ... fifth bus bar. The first bus bar 14 ₁ has a two-branch configuration having _two tabs 15A ₁ and 15A ₂ at both ends as connection points, and is disposed on an insulating plate (not shown) below the insulating plate 16. tab 15A ₁ of the projects from the tab insertion holes 16a on the insulating plate 16, as in the case arranged in the fuse connector 17 provided on the case outer surface of the electrical connection box J in FIG. 7, is housed, the other tabs 15A ₂ It is derived in a wire harness connector 18 _1.

The second bus bar 14 ₂ has three tabs 15
It has a three-branch configuration having B ₁ , 15B ₂ , and 15B _{3. The} tabs 15B ₁ are arranged in the same row as the tabs 15A _1, and the other two tabs 15B ₂ , 15B ₃ are connected to the connector 18 ₂ Is derived.

Third bus bar 14_ThreeIs a tab 15C₁,
15C_Two…, 15C_FiveAnd a tab 1
5C₁Is the second bus bar 14 on the insulating plate 16._Twoof
Tab 15B₁Are provided facing each other at a predetermined interval.
This interval is the length of the connecting piece 10 of the branch relay terminal A.
It corresponds to. Another tab 15C_TwoIs a tab 15C
₁Fifth busbar 1 in the same row as above and having a three-branch configuration
4_FiveTab E₁And the other three tabs 15C
_Three~ 15C_FiveIs the wiring harness connector 18 _ThreeDerived to
Have been.

Fourth bus bar 14_FourIs a tab 15D₁,
15D_Two, 15D_ThreeMulti-branch configuration with ..., fifth busbar
-14_FiveIs tab 15E₁~ 15E_ThreeWith a three-branch configuration
Yes, 18_FourAlso shows a connector for a wire harness. the above
In the configuration, the first and second busbars 14₁And 14_Twoof
Adjacent tab 15A₁, 15B₁To each normal relay
Terminal B is connected in the same manner as in FIGS.
A fuse e is connected between B and B. Similarly, the fourth and fifth
Busbar 14_Four, 14_FiveAdjacent tab 15D₁, 1
5E₁Also, the fuse e is connected via the relay terminal B.
In this case, the first bus bar 14₁Tab 15A₁The figure
Input tab for power supply side tab f of fuse e shown in FIG.
And the second bus bar 14 _TwoTab 15B₁Is Hugh
A tab for output with respect to the load side tab f of the position e. Tab 1
5D₁, 15E₁The same can be said for.

As described above, the first and second bus bars 14
₁, 14_TwoFuse connection by the relay terminal B of
Fourth and fifth busbar 14_Four, 14_FiveSimilar fuse tie
In some cases, the rotation as shown by the solid line in FIG.
The path L is obtained. In this circuit L, the third bus bar 14
_ThreeIs independent of other busbars and has three tabs 15C _Three
~ 15C_FiveWire harness connector 18_ThreeIs
A branch connector that absorbs branch connections in the wire harness
Used as

Next, as shown in FIG. 5A, the tab 15B ₁ of the _second bus bar 142 and the third bus bar 15C ₁
Are connected by the electrical contact portion 1 of the branch relay terminal A and the tab receiving portion 11 in accordance with the connection method of FIG. 2, and then fuse-bonded in the same manner as described above to obtain a circuit M as shown in FIG. Can be

In contrast to FIG. 5A, the third bus bar 14 ₃
5th bus bar 14 using another tab 15C ₂ of
₅ and Tab 15D ₁ in connected with the branch relay terminal A, when the fuse bonds, circuit N shown in FIG. 6 (B) is formed.
In the circuit M or circuit N, since the third bus bars 14 ₃ is connected to a different power supply system fuse e is interposed (first or fourth bus bar 14 _1, 14 _4), the connector wire harness 18 ₃ Is used for electric wiring for each vehicle type and additional wiring for optional circuits.

[0023]

As described above, according to the present invention,
Two different circuits can be formed alternatively using the fuse connection part of the bus bar, which is the internal circuit conductor of the electrical junction box, and the branch relay terminal, and the circuit can be easily changed without changing the pattern of the bus bar itself. Will be

[Brief description of the drawings]

FIG. 1 is a perspective view of a branch relay terminal used in the present invention.

FIG. 2 is a longitudinal sectional view showing a use state of the above.

FIG. 3 is a perspective view of a relay terminal used in the present invention.

FIG. 4A is a perspective view of a bus bar used for forming a circuit according to one embodiment of the present invention, and FIG. 4B is a circuit configuration diagram thereof.

FIGS. 5A and 5B are perspective views showing a circuit changing method using the bus bar of FIG. 3A;

FIGS. 6A and 6B are FIGS. 3A and 3B, respectively.
FIG. 3 is a circuit configuration diagram due to the circuit change of FIG.

FIG. 7 is an exploded perspective view showing an example of a conventional electric junction box.

FIG. 8 is a perspective view of a bus bar used for forming a conventional circuit.

9 (A) and 9 (B) are circuit configuration diagrams obtained by two bus bars of FIG. 7, respectively.

[Description of Signs] A Branch relay terminal B Relay terminal J Electrical connection box L, M, N circuit e Fuse 1 Electrical contact part 2 Fixed contact plate 4 First elastic contact plate 8 Second elastic contact plate 11 Tab receiving Part 14 ₁ First bus bar 14 ₂ Second bus bar 14 ₃ Third bus bar 15 A ₁ , 15 B ₁ Tab 16 Insulating plate 17 Fuse connector 18 ₁ , 18 ₂ Wire harness connector

Claims (1)

(57) [Claims] A first bus bar provided with an input tab connected to a power supply side tab of the fuse; a second bus bar provided with an output tab connected to a load side tab of the fuse; A busbar wiring board including an output tab and a third busbar provided with an output tab facing at a predetermined interval;
A relay terminal provided with an electrical contact portion for electrically connecting tabs inserted from opposite directions to each other, and the electrical contact portion further from the electrical contact portion via a connecting piece having a length corresponding to the predetermined interval. A branch relay terminal having opposing tab receiving portions, wherein the relay terminal is connected to the input tab of the first bus bar and the output tab of the second bus bar, and a fuse is provided between the relay terminals. Or the relay terminal is connected to an input tab of the first bus bar, the branch relay terminal is connected to an output tab of the second bus bar, and a tab receiving portion of the branch relay terminal is connected. An output tab of the third bus bar is connected to a bearing portion, and a fuse is interposed between the branch relay terminal and the relay terminal to form two types of circuits alternatively. How to change the busbar circuit.