JPH10174254A - Electrical connection structure of electrical connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a fusible link and a busbar in a junction box without any electric wire. SOLUTION: A fusible link housing part 24 is provided on the upper surface of the case of a junction block 20 that is housed by laminating a busbar in horizontal direction inside, a fusible link with a pair of terminals 27A and 27B that are horizontally opened in separating horizontal directions is engaged to the fusible link housing part 24, a pair of horizontally open terminals 27A-1 and 27B-1 of the fusible link are brought into contact with the upper surfaces of upstream busbar and downstream busbar that are housed in the above case, and a bolt is passed into holes 27A-2 and 27B-2 that are formed at the horizontally open terminals 27A-1 and 27B-1 and the above busbar from an upper part for clamping to a nut for fixing into the above case for electrical connection. The above upstream busbar is connected to a terminal connected to the terminal of a power supply side electric wire 35 via a connector 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric connection structure of an electric connection box for an automobile, and more particularly, to an internal circuit of an electric connection box such as a junction block disposed in an engine room of an automobile through a fusible link from a power supply. In the electrical connection structure for supplying power to the power supply, the structure of the connection between the power supply and the fusible link and the connection between the fusible link and the internal circuit of the junction block are simplified.

[0002]

2. Description of the Related Art Conventionally, a junction block and a fusible link block disposed in an engine room are formed as separate members, and are connected via thick electric wires.
That is, the power source and the fusible link are connected via a thick wire, and the fusible link and the bus bar in the junction block are also connected via the thick wire, and the bus bar branches to each load.

More specifically, as shown in FIGS. 7 to 9,
A terminal 2 having a round hole 2a is crimp-connected to a terminal of the electric wire w1 connected to the power supply 1, and the terminal 2 is connected to one terminal 5 of a fusible link 4A housed in a fusible link block 3, and a bolt 6 is connected thereto. In this case, the nut (not shown) fixed in the fusible link block 3 is screwed and fixed through the round hole 2a of the terminal 2 and the round hole of the terminal 5.

The other terminal 7 of the fusible link 4A is connected to the terminal 8 connected to the terminal of the electric wire w2 connected to the alternator by bolting in the same manner as described above. One terminal of the fusible link 4B juxtaposed with the fusible link 4A is connected to the terminal 7 with a bus bar,
The terminal 7 is connected to the terminal 9 connected to one end of the electric wire w3 by bolting. A crimp terminal (not shown) is connected to the other end of the electric wire w3, the crimp terminal is inserted and fixed in the connector 10, and the connector 10 is fitted into a connector insertion portion provided in the junction block 11 to form a junction. A tab provided on a bus bar housed in the block 11 is inserted into the connector 10 and connected to a crimp terminal. The other terminal of the fusible link 4B is connected to a round terminal via a connector and an electric wire by bolting, similarly to the bus bar in the junction block 11.

The allowable current of the fusible link 4A is 100 amps, and the allowable current of the fusible link 4B connected to the downstream side of the fusible link 4A is 60 amps. Configuration.

As described above, the power source and the fusible link are connected to each other by bolting the terminals via the thick wire, and the fusible link and the bus bar in the junction block are connected to the fusible link via the thick wire. Are connected to each other by bolts, and the bus bar side is connected to a connector.

[0007]

In the connection structure described above, first, the connection between the fusible link and the power supply side and the junction block side is connected to the end of the electric wire, and the round hole terminal is connected to the end of the fusible link by bolting. However, after the bolts are tightened, the wires are U-turned and the terminals are pushed up for wiring, so that the terminals are easily deformed as shown in FIG. 10 and the bolts are easily loosened. As a result, the reliability of the electrical connection is reduced. There is a problem of decline. further,
Since the bolt is tightened from the side to the terminal of the fusible link in the vertical direction, there is also a problem that it is difficult to tighten the bolt and it takes time and effort.

Further, since the number of parts such as electric wires, terminals and connectors increases, and the fusible link is housed in the fusible link block, the fusible link block and the junction block are respectively covered. The fixing work needs to be fixed to the mounting member, and this fixing work requires a lot of trouble and also has a problem of taking up space.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problem, and uses a round terminal for connection between a fusible link, a power supply side, and a junction block side. It is an object to reduce the number of parts and the number of working steps by directly connecting the internal circuit without using an electric wire and a connector.

[0010]

In order to solve the above-mentioned problems, the present invention first provides a fusible link accommodating portion on a case upper surface of a junction block in which horizontal bus bars are stacked and accommodated therein. Is provided, the fusible link receiving portion is fitted with a fusible link having a pair of horizontally opened horizontally separated terminals that are separated from each other, and the pair of horizontally opened terminals of the fusible link are respectively placed in the case. The upper and lower busbars that are housed are brought into contact with the upper surfaces of the upper and lower busbars, and bolts are passed through holes formed in these laterally opened terminals and the busbars from above, and fastened to nuts fixed in the case. An electric connection structure of an electric connection box characterized by being electrically connected is provided.

Further, a terminal attached to a wire terminal connected to the power supply side is accommodated in a connector, and the connector is fitted in a connector fitting portion provided in a case of the junction block to form the upstream bus bar. 2. A tab is inserted into said connector and electrically connected to said terminal.
The electrical connection structure of the electrical connection box described in (1) is provided.

[0012] In the power supply connection structure of the electric junction box described above,
First, since the fusible link fitting portion is provided on the junction block and the fusible link is fitted and attached, as in the related art, a separate member including the junction block and the fusible link block is provided. There is no need for this, and only the junction block needs to be fixed to the mounting member in the engine room.

Conventionally, a fusible link and a bus bar in a junction block are connected via a thick wire.
In the present invention, the fusible link is directly attached to the junction block, and the laterally open terminal of the fusible link is horizontally inserted into the junction block. Is connected to the upper surface of the bus bar accommodated in the connector, and is directly electrically connected to the bus bar from above by bolting, so that connection by a thick electric wire can be eliminated. And,
The bolt connection from the side using the round terminal has been changed to a form in which the bolt is tightened from above to the hole provided in the horizontal opening terminal and the horizontal bus bar, so that the conventionally used round connection is used. The terminal can be eliminated, and the deformation of the terminal, which occurred when the round terminal was used, and the reduction in the reliability of the electrical connection caused by the deformation can be solved. In addition, the workability can be improved because the bolt is changed from being tightened from the side to being tightened from above.

Further, in connection with the power supply side, the round terminal is conventionally connected to the fusible link terminal by bolting from the side. By simply inserting the terminal attached to the end of the side wire into the connector and fitting the connector to the junction block, the terminal is electrically connected to the tab of the bus bar connected to the terminal of the fusible link. Therefore, the bolting work of the round terminal can be eliminated, the connection with the power supply side in the automobile assembly line can be easily performed, the workability can be improved, and the bolting of the round terminal has occurred. Further, it is possible to eliminate a decrease in reliability of the electrical connection.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

The junction block 20 disposed in the engine room includes an upper case 21 and a lower case 22.
A bus bar 23 in the horizontal direction is laminated and placed via an insulating plate in a case composed of: and a fusible link fitting portion 24 is provided on the upper surface of one side of the upper case 21;
Below the fusible link fitting portion 24, a horizontal upstream bus bar 23A and a downstream bus bar 23B in the bus bar 23, which are formed by bending from the lower bus bar, are arranged. These upstream bus bar 23A and downstream bus bar 23B have bolt mounting holes 23A-1 and 23B, respectively.
-1 is formed.

One fusible link 25 of a horizontal opening type is fitted in the fusible link fitting portion 24. The fusible link 25 accommodates the vertical portions of a pair of L-shaped terminals 27A and 27B in a housing 26 and connects them by a fusing portion (not shown).
A-1 and 27B-1 are projected in the horizontal direction away from each other, and bolt mounting holes 27A-2 and 27A-2
7B-2 is provided. Fusible link fitting part 24
In the state of being fitted to the upper side bus bar 23A, the laterally open portion 27A-1 abuts on each of the bolt mounting holes 27A.
-2 and 23A-1 communicate with each other, while the horizontal opening portion 27B
-1 abuts on the downstream side bus bar 23B, and the bolt mounting holes 27B-2 and 27B-1 communicate with each other.

Below the communicating portions of the bolt mounting holes on the upstream side and the downstream side, bolt insertion recesses 28 are formed in the lower case 22, respectively.
A, 28B are provided, and these bolt insertion recesses 28A, 28
The nuts 29A and 29B are press-fitted and fixed to B. The bolt 30A is passed through the bolt mounting holes 27A-2 and 23A-1 and tightened to the nut 29A to electrically connect the fusible link terminal 27A and the upstream bus bar 23A. Similarly, bolt mounting holes 27B-2 and 27B-
1 and a bolt 30B, and tightened to the nut 29B to electrically connect the terminal 27B of the fusible link to the downstream bus bar 23B. Also, the lower case 22
Below the fusible link fitting portion 24, a pair of connector fitting portions 3 protruding downward are provided.
1, 32 are protrudingly provided. Above one connector fitting portion 31, an upper portion 23A-2 that is bent upward from the upstream bus bar 23A and then extends in the horizontal direction is disposed, and protrudes downward from the upper portion 23A-2. The provided tab 23A-3 is projected into the connector fitting portion 31. Above the other connector fitting portion 32, an upper portion 23B-2 that is bent upward from the downstream bus bar 23B and then extends in the horizontal direction is disposed, and the upper portion 23B-2 faces downward from the upper portion 23B-2. Tab 23B-3 projecting from
Are projected into the connector fitting portion 32.

As shown in the circuit diagram of FIG. 6, a branch circuit portion 23B-4 is formed on the downstream bus bar 23B.
These partial circuit portions 23B-4 are connected to bus bars constituting a large number of circuits 23B-5 connected to the load side via fuses 33 attached to the junction block 20.

As shown in FIG. 5, a female terminal 36 is crimp-connected to the terminal of the electric wire 35 connected to the power supply, and the terminal 36 is housed and fixed in a connector 37. When the connector 37 is fitted into the connector accommodating portion 31 of the junction block 20, the tab 23A-3 of the upstream bus bar 23A is inserted into the female electrical connection portion 36a of the terminal 36 to be electrically connected. In addition, you may make it connect via a relay terminal.

Similarly, the electric wires 38 connected to the alternator
A female terminal (not shown) is crimped to the terminal, and the terminal is accommodated and fixed in the connector 39. The connector 39 is connected to the connector housing 32 of the junction block 20.
When fitted in the terminal, the terminal and the tab 2 of the downstream bus bar 23B
3A-3 is inserted and electrically connected.

As described above, the junction block 2
No. 0 connector fitting portion 31 is fitted with the power supply side connector 37 and connected to the upstream bus bar 23A.
By connecting 3 A to one terminal 27 A of the fusible link 25, the power supply and the fusible link 25 are connected. Further, by connecting the other terminal 27B of the fusible link 25 to the downstream bus bar 23B, the downstream bus bar 23B is connected to the load side circuit, so that power is supplied from the fusible link 25 to the load side circuit. Can supply. Further, the downstream bus bar 23B is connected to an alternator via a connector 39.

From the power supply side, the junction block 2
The power supply circuit to each load side through 0 and the circuit to the alternator are configured as shown in FIG. That is, in the present invention, a circuit in which two fusible links are conventionally attached to a fusible link block different from the junction block and connected to the bus bar on the junction block side via a thick wire is used in the present invention. By simply attaching one side-open fusible link 25 directly to the bus bar in the junction block 20, a circuit similar to the conventional circuit can be formed without the need for a thick electric wire.

[0024]

As is apparent from the above description, according to the electric connection structure of the electric junction box of the present invention, first, conventionally, two separate members, a junction block and a fusible link block, are required. On the other hand, in the present invention, since the fusible link is directly attached to the junction block, the fusible link block can be omitted, and as a result, only the junction block is fixed to the mounting member in the engine room. It will be good. As described above, the work of mounting the two separate members in the narrow engine room can be eliminated, so that the workability can be improved and there is an advantage that no space is required.

Further, conventionally, since the junction block and the fusible link block are formed as separate members, the connection between the fusible link and the circuit in the junction block is performed by using a thick wire, a round terminal and a connector. According to the present invention, since the fusible link is directly attached to the junction block and electrically connected by direct bolting, it is not necessary to use the conventionally required connection parts including the thick wire, the round terminal and the connector. it can. As a result, the number of parts can be significantly reduced, and a number of assembling steps can be eliminated, the number of operations can be drastically reduced, and as a result, a significant cost reduction can be achieved.

In addition, conventionally, the round terminal connected to the thick wire terminal is connected to the fusible link terminal and the bolt from the side for connecting the fusible link to the power supply side and connecting the fusible link to the bus bar of the junction block. Although the connection is made by tightening, in the present invention, the bolted connection by the round terminal of the thick wire terminal can be eliminated. Therefore, the conventional problem that the round terminal is deformed by the U-turn wiring of the thick wire or the bolt is loosened and the reliability of the electrical connection is reduced can be solved. In addition, in the present invention, the fusible link is of the laterally open type, so that the connection between the terminal of the fusible link and the bus bar can be performed by bolting from above, and the conventional case of performing bolting work from the side. In comparison, the bolting operation can be performed easily, and the operation efficiency can be improved.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the junction block of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a schematic exploded perspective view of a portion connecting the power supply-side electric wire terminal and the bus bar of the present embodiment via a connector.

FIG. 6 is a power supply circuit diagram of the present embodiment.

FIG. 7 is an exploded perspective view showing a conventional example.

FIG. 8 is a partially enlarged view of FIG. 7;

9 is a power supply circuit diagram of the conventional example of FIG.

FIG. 10 is a schematic view showing a conventional problem.

[Description of Signs] 20 Junction block 21 Upper case 22 Lower case 23 Bus bar 23A Upstream bus bar 23B Downstream bus bar 23A-1, 23B-1 Bolt mounting hole 23A-3, 23B-3 Tab 24 Fusible link fitting part 25 Huge Bull link 27A Upstream terminal 27B Downstream terminal 27A-1, 27B-1 Side opening 29A, 29B Nut 30A, 30B Bolt 31 32 Connector fitting part 35 Power supply connection wire 37, 39 Connector

Claims (2)

[Claims] A fusible link accommodating portion is provided on an upper surface of a case of a junction block in which horizontal bus bars are stacked and accommodated inside, and a pair of fusible link accommodating portions are horizontally opened apart from each other in a horizontal direction. The fusible link having the terminals of the fusible link is fitted, and the pair of laterally opened terminals of the fusible link are respectively brought into contact with the upper surfaces of the upstream busbar and the downstream busbar housed in the case, and these laterally opened terminals are opened. An electrical connection structure for an electrical connection box, wherein bolts are passed through holes formed in the terminal and the bus bar from above and fastened to a nut fixed in the case to be electrically connected. 2. A terminal attached to a wire terminal connected to a power supply side is accommodated in a connector, and the connector is fitted into a connector fitting portion provided in a case of the junction block to form the upstream bus bar. 2. The electrical connection structure for an electrical connection box according to claim 1, wherein a tab is inserted into said connector and electrically connected to said terminal.