JPH0357057Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention [Industrial field of application] The present invention relates to electrical junction boxes used for wiring in automobiles, etc., and particularly relates to the connection between the tabs of busbars constituting internal circuits and external connection terminals. This prevents leakage current from occurring due to water intrusion.

[Conventional technology]

The conventional electrical junction box, as shown in Figures 4 and 5,
A laminated wiring board A consisting of a plurality of bus bars 1, 1' and insulating substrates 2, 2' is mounted on an upper case (or cover) 3.
is housed in the lower case 4, and 5 groups of tabs connected upright to the bus bar 1 are made to protrude from connector housings 6A, 6B, 6C, etc. provided in both cases 3, 4, and electrical components such as fuses, relays, etc. It is configured to be connected to the connector of the wire harness terminal.

As the first waterproofing measure, the waterproof cover 7
is assembled to the lower case 3 using lock members 8, 8'.

As a second waterproofing measure, busbars 1 and 1' are
The first-layer insulating substrate 2 is disposed on both the front and back surfaces of the first-layer insulating substrate 2' to prevent water from directly splashing onto the first-layer bus bar 1.

FIG. 5 shows the structure of the connecting portion between the tab of the bus bar and the external connection terminal. That is, a seat 10 (FIG. 6) having a tab through hole 9 is provided on the first layer insulating substrate 2 on which no bus bar is provided, and a female-female connector is attached to the tab 5 rising from the lower layer through the tab through hole 9. Relay terminal 1
The relay terminal 11 is housed in, for example, a connector housing 6A, and the fuse terminal 12 is inserted through the tab through hole 9' of the top plate 6a.

Furthermore, as a third measure against water intrusion into the electrical connection box, as shown in FIG. 12 is provided, and water falling from this is drained from a drain port 13 provided in the bottom plate 4a of the case 4.

[Problem that the invention attempts to solve]

As mentioned above, various waterproofing measures have been taken for conventional electrical junction boxes, but they are not perfect; for example, water can enter from the lock part of an electrical junction box placed in the engine room when washing the car with high-pressure water. or
Condensation occurs inside the waterproof cover 7 due to air conditioner use, etc.
Water droplets adhere to the inner surface of the cover.

Therefore, the top plate 6 of the connector housing 6A
The water that adheres to or falls on the tab a through the tab through hole 9' flows through the relay terminal 11 as shown by the arrow P in FIGS. 5 and 6.
It flows through the back surface of the tab through-hole 9 from between the seat 10 and the seat 10 by capillary action, spreads over the first layer busbar circuit, and generates a leakage current between the busbars 1 where there is a potential difference.

An object of the present invention is to provide an electrical connection box that can prevent leakage current between busbars caused by water intrusion from the joint between the tab of the busbar and the external connection terminal.

Structure of the invention [Means for solving the problems] In order to achieve the above-mentioned object, the electrical junction box of the invention has tabs 5 and 5, as shown in FIGS. 1 to 3.
A wiring board A consisting of busbars 1, 1' and insulating substrates 2, 2', and a case 3 for housing the same,
4, and the uppermost insulating substrate 2 has a tab through hole 9.
In the electrical connection box, a seat 10 having a seat 10 is set upright, and one end of a relay terminal 11 for connecting an external terminal is inserted into a tab rising from a lower layer through the tab through hole 9, and is seated on the seat 10. It is characterized in that a water collection groove 14 is recessed in the outer wall surface of the catch seat 10.

In the above structure, the water collection groove 14 is formed in the shape of a funnel with an open upper end, and is provided on the back side of the receiver 10, particularly the relay terminal 11, but it is preferable to provide it on both sides as shown in FIG. In addition, the insulating substrate 2
It is preferable to provide an edge 2a that surrounds the lower insulating substrate 2', and to provide a drainage groove 15 that communicates with the water collection groove 14 at one end and has an opening 15a at the other end at the edge 2a. The drain groove 15 may be provided in each seat 10, or some of the drain grooves 15 may be grouped together.

Note that the explanation of the waterproof cover 7 of the electrical connection box and other structural members that are the same as the conventional ones will be omitted with reference to FIGS. 4 to 7.

[Effect]

According to the electrical connection box of the present invention, as shown in FIG.
4 by capillary action, almost no water enters the internal busbar circuit from the tab through hole 9, and leakage current is prevented from occurring. And water collection groove 1
The water collected on the outside of the seat 10 by the drain groove 15 is discharged to the outside of the insulating substrate 2 by the drain groove 15. In addition, from the opening 14a of the drain groove 15, the lower case 4
The water that fell into the drain port 1 was caused by the vibration of the car, etc.
3 is discharged to the outside.

Effects of the invention As explained above, according to the invention, in a conventional electrical connection box, water intrusion and leakage into the inside of the wiring board can be prevented by simply providing a water collection groove in the seat on which the relay terminal is seated and its insulating board. Generation of current can be prevented.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the main parts of an electrical junction box showing an embodiment of the present invention, Fig. 2 is an enlarged perspective view of the catch portion of Fig. 1, and Fig. 3 shows the operating state of Fig. 2. 4 is an exploded perspective view of a conventional electrical connection box, FIG. 5 is a vertical sectional view of the connector housing 6A shown in FIG. 4, and FIG. 6 shows the seat and relay terminal shown in FIG. 4. FIG. 7 is a longitudinal sectional view of the end of the electrical connection box shown in FIG. 4. A...Wiring board, 1, 1'...Bus bar, 2,
2'... Insulating board, 3... Upper case, 4... Lower case, 5... Tab, 9... Tab through hole, 10
...Socket, 14...Water collection ditch, 15...Drainage ditch.

Claims (1)

[Scope of utility model registration request] It includes a wiring board consisting of a plurality of busbars having tabs and an insulating board, and a case for storing the wiring board,
A seat having a tab through hole is provided upright on the uppermost insulating substrate, and one end of a relay terminal for external terminal connection is inserted into the tab rising from the lower layer through the tab through hole, and is seated on the seat. An electrical connection box, characterized in that a water collection groove is recessed in the outer wall surface of the catch.