JP2002152943A - Electrical connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrical connection box, wherein electrical components are prevented from being electrically short-circuited to water that has collected in the electrical connection box. SOLUTION: A wiring board 1 with a fuse housing 3 installed thereon is attached to the electrical connection box so that the fuse housing installation face of the wiring board is substantially perpendicular. Drain grooves 10a and 10b and a water stop wall 11 are formed on the fuse housing 3, and a drainage ditch 12a running from the fuse housing 3 to the side end of the wiring board 1 is formed on the wiring board 1.

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 provided with a wiring board and electric parts such as fuses, relays and connectors, and used for automobiles and the like.

[0002]

2. Description of the Related Art In recent years, an electric junction box having a circuit portion formed of a wiring board has been used for the purpose of reducing the size and weight.
The electric connection box is mounted so that the wiring board 1 stands vertically in the lower case 8 as shown in FIG. A fuse housing 3 is attached to the wiring board 1, and a plurality of fuse terminals 2 are attached to the fuse housing 3. And fuse 4
Are inserted into the fuse terminals 2 in parallel with the surface of the wiring board 1 through the fuse holder 5 attached to the upper case 6. The upper case 6 is covered with an upper cover 7. Reference numeral 9 denotes an electric component such as a relay.

[0003] This type of electric junction box is mounted in an engine room or the like. However, incomplete fitting of the upper cover 7 and the upper case 6 or replacement of the upper cover 7 caused by fuse replacement or the like. Therefore, water may enter the electrical junction box. However, in the above electrical junction box, since the wiring board 1 is mounted vertically, the water that has entered flows down along the surface of the wiring board 1 and does not stay on the surface of the wiring board 1.

[0004]

However, the above-mentioned electric junction box has the following problems. 1) Although water does not stay on the surface of the wiring board 1, the electric component 9 is mounted on the lower side of the fuse housing 3 on the wiring board 1, and the water flowing down from the fuse housing 3 9, the electrical component 9 may be electrically short-circuited.

[0005] 2) When water flowing down from the fuse housing 3 stays at the bottom of the electric connection box and a connector is mounted on the lower end of the wiring board 1, the staying water causes electrical connection between the terminals of the connector. Short circuit may occur.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and the invention according to claim 1 is to dispose a wiring board on which a fuse housing is mounted so that its surface is substantially vertical. In the mounted electric junction box, a groove for drainage and a wall for stopping water are provided in the fuse housing.

According to a second aspect of the present invention, in the electrical junction box according to the first aspect, a drainage channel is provided on the wiring board for guiding water drained from the fuse housing to a side end of the wiring board. It is characterized by having.

According to a third aspect of the present invention, in the electrical junction box according to the first aspect, a drain passage is provided on the wiring board for guiding water drained from the fuse housing to a central portion of the wiring board. It is characterized by the following.

According to a fourth aspect of the present invention, in the electrical junction box according to any one of the first to third aspects, a duct for discharging water drained from the fuse housing to the outside of the electrical junction box is provided. Is what you do.

[0010] Further, the invention according to claim 5 is based on claim 4.
The electric junction box according to claim 1, further comprising a guide rib for guiding water discharged from the fuse housing to the duct.

According to the first aspect of the present invention, since the groove for drainage and the wall for stopping water are provided in the fuse housing, water on the fuse housing does not flow around the fuse housing by the wall. Flows along the grooves.

Further, according to the invention of claim 2 or 3,
Since a drainage channel for guiding the water drained from the fuse housing to the side end or the center of the wiring board is provided, the water on the fuse housing flows along the groove, and further, the wiring board along the drainage channel. It reaches the side edge or center of the, and flows down. Therefore, since water on the fuse housing does not flow below the fuse housing along the wiring board surface, it is possible to prevent an electric component mounted below the fuse housing 3 from being electrically short-circuited by water. it can.

According to the fourth aspect of the present invention, since there is provided a duct for discharging the water drained from the fuse housing to the outside of the electric junction box, water does not accumulate at the bottom of the electric junction box. Even if the connector is mounted on the lower end of the wiring board, no electrical short circuit occurs between the terminals of the connector.

Further, according to the fifth aspect of the present invention, since there is provided a guide rib for guiding water discharged from the fuse housing to the duct, the water discharged from the fuse housing is supplied to the duct even when the vehicle is inclined. Guiding can be performed reliably, and water can be prevented from staying in the electric junction box.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a main part of a wiring board used in an embodiment of an electric junction box according to the present invention. In FIG. 1, a wiring board 1 is mounted substantially vertically in an electric junction box, and a fuse housing 3 in which fuse terminals 2 are assembled in two rows is mounted on the wiring board 1.

The present invention is characterized in that drain grooves 10a and 10b and a water stop wall 11 are provided on the upper surface of the fuse housing 3, and a drain passage 12a is provided on the wiring board 1.
The groove 10a is provided on the upper surface of the fuse housing 3 in the wiring board 1.
It is provided so as to be parallel to the surface and inclined to the lower left in FIG. The grooves 10 a are provided at three places between the wiring board 1 and the fuse terminals 2, between the fuse terminals 2, and between the fuse terminals 2 and the wall 11. Groove 10a
Is provided so that the bottom surface is inclined to one side in the longitudinal direction as shown in FIG. 2A, and is provided so that the width direction is also inclined to one side as shown in FIG. 2B. , Even a small amount of water flows well. Also, the groove 10b
Are provided between the fuse terminals 2 so as to be orthogonally connected to the three parallel grooves 10a. In other words, the grooves 10a and 10b are provided so as to form a grid.

The wall 11 is set up so as to surround the periphery of the upper surface of the fuse housing 3. Further, in FIG. 1, the drainage channel 12a is provided with a drainage channel member 12 mounted on the wiring board 1 adjacent to the fuse housing 3 and is lowered leftward from the left side of the fuse housing 3 to the left end of the wiring board 1. It is provided in.

In the above-described wiring board 1, since the upper surface of the fuse housing 3 is surrounded by the wall 11, the water accumulated on the upper surface of the fuse housing 3 does not flow down from the periphery of the fuse housing 3 and the groove 10a. , 10b
Gather in Further, since the groove 10a is provided so as to be inclined downward to the left in FIG. 1, the water collected in the groove 10a flows in the groove 10a in one direction to the left, and flows down from the end of the groove 10a to the drainage channel 12a. Then, the water is guided to the left end of the wiring board 1 by the drainage channel 12a, and flows down there.

As described above, in the wiring board 1 of the present embodiment, the water accumulated in the fuse housing 3 is guided to the side end of the wiring board 1 and flows down there, so that it is mounted below the fuse housing 3. Water does not touch the electric parts 9. Therefore, it is possible to prevent the electric component 9 from being electrically short-circuited by water that has entered the electric connection box.

In the above embodiment, the drain groove 10a provided parallel to the surface of the wiring board 1 is formed so as to flow to one end of the wiring board 1, but the groove 10a is
As shown in FIGS. 3 (a) and 3 (b), it may be inclined so as to descend from the center in both longitudinal directions. In this case, drainage channels are provided on both sides of the fuse housing 3, and water collected on the upper surface of the fuse housing 3 is guided to both side ends of the wiring board 1 and flows down.

Next, another embodiment will be described. As shown in FIG. 4 (a), the drain groove 10a adjacent to the fuse housing 3 in parallel with the surface of the wiring board 1 is inclined such that the bottom surface is the lowest at the center and is directed downward toward the center. And a through hole 13 is provided. FIG.
(B) shows a state in which the fuse housing 3 is attached to the wiring board 1 (for simplicity, fuse terminals are not shown). A pair of drainage members 14 are attached below the center of the fuse housing 3. The pair of drainage members 14 has an inclined drainage portion 14a that is inclined so that the central portion is lowered, and a vertical drainage portion 14b that is provided vertically, and is attached to form a Y-shape. I have. Then, a pair of opposed vertical drainage channels 14b
Form a vertical groove below the through hole 13.

The pair of drainage channel members 14 are arranged such that the inclined drainage channel 14a guides water to the center, and the opposed vertical drainage channel 1
The groove between 4b forms the drainage channel 15 which guides water downward. The water accumulated on the upper surface of the fuse housing 3 flows through the groove 10 a to the central portion, falls through the through hole 13, and further falls along the drain passage 15. in this way,
In the wiring board 1 of the present embodiment, the water collected in the fuse housing 3 is guided to the central portion of the wiring board 1,
Water does not come into contact with the electrical components 9 mounted below the fuse housing 3 and on both sides of the drainage channel 15.

FIGS. 5 (a) and 5 (b) are a perspective view and a sectional view of a main part of still another embodiment. In the present embodiment, a duct 16 is provided vertically inside the side wall of the lower case 8. The duct 16 is provided such that the upper end is located immediately below the end of the drainage channel 19 provided in the fuse housing 3. In the present embodiment, the water drained from the fuse housing 3 passes through the drainage channel 19 and passes through the duct 1
6 and is discharged out of the lower case 8. Therefore, an electrical short circuit does not occur between the terminals of the connector 17 mounted on the lower end of the wiring board 1.

FIG. 6 shows the embodiment shown in FIG.
FIG. 9 is a cross-sectional view of an embodiment in which a guide rib 18 extending vertically along the inner surface of the side wall of the upper case 6 is provided. The guide rib 18 is in contact with or slightly away from the drainage channel 19 in a state where the upper case 6 is placed on the lower case 8, and the guide rib 18 is provided such that the distal end portion 18 a is located in the duct 16. In the present embodiment, even if the vehicle is inclined, the water drained from the fuse housing 3 passes through the drainage channel 19, travels along the guide rib 18, and falls down the duct 16 without fail and is discharged to the outside of the lower case 8. You.

The present invention is not limited to the above embodiment. For example, as shown in FIG. 7, the guide rib 18 may be provided on the inner surface of the duct 16 provided on the side wall of the lower case 8 in the vertical direction so as to be in contact with the drainage channel 19. In addition, as shown in FIG. 8, the duct 16 may be provided vertically at the end of the fuse housing 3 as a single unit.
Furthermore, the duct 16 does not need to be installed at the lateral end of the vertically arranged wiring board 1, and may be at the center.

[0026]

As described above, according to the first to third aspects of the present invention, it is possible to prevent an electric component mounted below the fuse housing from being electrically short-circuited by water accumulated on the fuse housing. There is an excellent effect that can be. According to the fourth and fifth aspects of the invention, it is possible to prevent water from staying at the bottom of the electric connection box, and to electrically short-circuit the terminals of the connector even if the connector is mounted on the lower end of the wiring board. There is an excellent effect that the occurrence of phenomena can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a wiring board used in an embodiment of an electric junction box according to the present invention.

FIGS. 2A and 2B are a longitudinal sectional view and a transverse sectional view, respectively, of a drain groove provided in a fuse housing in the embodiment.

FIGS. 3A and 3B are a longitudinal sectional view and a transverse sectional view of another embodiment of a drain groove provided in a fuse housing, respectively.

FIGS. 4A and 4B are a cross-sectional view of a drain groove provided in a fuse housing according to another embodiment and a plan view of a state where the fuse housing is attached to a wiring board.

FIGS. 5A and 5B are a perspective view and a longitudinal sectional view, respectively, of a main part of another embodiment.

FIG. 6 is a longitudinal sectional view of still another embodiment.

FIG. 7 is a longitudinal sectional view of still another embodiment.

FIG. 8 is a longitudinal sectional view of still another embodiment.

FIG. 9 is an exploded perspective view of a conventional electric junction box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wiring board 2 Fuse terminal 3 Fuse housing 4 Fuse 5 Fuse holder 6 Upper case 7 Upper cover 8 Lower case 9 Electric parts 10a, 10b Groove 11 Wall 12, 14 Drainage channel member 12a, 15, 19 Drainage channel 13 Through hole 14a Inclined drainage Road 14b Vertical drainage 16 Duct 17 Connector 18 Guide rib

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshitaka Hara 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd. (72) Inventor Shigetaro Mukai 2-6-1 Marunouchi, Chiyoda-ku, Tokyo F-term in Furukawa Electric Co., Ltd. (reference) 4E360 AB12 AB31 EA03 ED17 ED27 GA29 GB93 GB94 5G361 BA01 BB01 BB03 BC01

Claims (5)

[Claims] 1. An electric connection box in which a wiring board on which a fuse housing is mounted is mounted so that its surface is substantially vertical, wherein the fuse housing is provided with a groove for drainage and a wall for water stoppage. An electrical junction box. 2. The electric junction box according to claim 1, wherein a drainage channel is provided on the wiring board for guiding water drained from the fuse housing to a side end of the wiring board. 3. The electrical junction box according to claim 1, wherein a drainage channel is provided on the wiring board for guiding water drained from the fuse housing to a central portion of the wiring board. 4. The electric junction box according to claim 1, further comprising a duct for discharging water discharged from the fuse housing to outside the electric junction box. 5. The electric junction box according to claim 4, further comprising a guide rib for guiding water discharged from said fuse housing to said duct.