JP3052807B2 - Drainage structure of 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 a drainage structure for an electric connection box mounted in an engine room or the like of an automobile, and more particularly to a structure for surely preventing water from leaking from a drain hole opened in a bottom wall of a case of the electric connection box. It is.

[0002]

2. Description of the Related Art In an electrical junction box such as a junction box mounted in an engine room of an automobile, when heavy rain falls or when the automobile is washed with high-pressure washing water, water may be generated inside the electrical junction box. Therefore, when the lower case or the lower cover of the electric connection box is covered, a drain hole is provided in the bottom wall of the lower cover, and water that has flooded the inside of the electric connection box is discharged to the outside from the drain hole, and the electric connection box is This prevents water from accumulating in the interior and corroding metal parts such as bus bars.

[0003] Various types of drain holes provided in the electric junction box have been proposed in the prior art.
No. 5 provides a drainage structure shown in FIGS. In each of the above-mentioned electric connection boxes, a waterproof plate 4 is provided at a required interval on the inside of the case opposite to the drain hole 2 opened in the case bottom wall 1, and arrows are provided from both left and right sides of the waterproof plate 4 to the drain hole 2. As shown by X1, drainage is configured. The waterproof plate 4 is provided with both ends in the front-rear direction continuously from the bottom wall 1 via a vertical wall.

[0004]

FIG. 5 (A) and FIG. 5 (B)
In the drainage structure shown in FIG. 5, the waterproof plate 4 faces the drain hole 2 at an interval, and the waterproof plate 4 is not continuous with the drain hole 2.
As shown by arrow X2, there is a problem that the inside of the case is flooded through the left and right drainage gaps as shown by arrow X2. Normally, water does not flow upward,
Although water does not infiltrate from the drain hole provided in the bottom wall of the electrical junction box, when washing a car with high-pressure washing water, the washing water may flow upward into the electrical junction box due to water pressure, The above problem may occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a drainage structure for an electric junction box which can reliably prevent infiltration of high-pressure washing water or the like from a drainage hole opened in a case bottom wall. It is an object.

[0006]

In order to achieve the above object, according to the present invention, a drain hole wall is protruded from a case bottom wall of an electric connection box, and a pair of lower ends of the drain hole wall is provided. The waterproof lid locking portions are protruded so as to face each other, and locking claws are protruded inward at the lower ends of the waterproof lid locking portions, and the waterproof lid is placed by holding both ends by the locking claws. The waterproof lid is provided by a water pressure from below to provide a drainage structure of the electric junction box, which is configured to close the lower end opening of the drainage hole wall.

According to the above drainage structure, water that has entered the inside of the electrical junction box from above falls into the bottom wall of the case inside the electrical junction box, flows down the slope of the bottom wall of the case, flows into the drain hole, and drains. It flows out from the lower end opening through the internal drain hole of the hole wall, and is discharged from between the pair of discharge lid locking portions.

On the other hand, when washing water flows upward from below the electric junction box due to water pressure when the automobile is washed, the water first comes into contact with the waterproof lid placed on the locking claw. . Thereby, the waterproof lid rises along the waterproof lid locking portion by water pressure, closes the lower end opening of the drain hole wall with the waterproof lid, and prevents the inside of the electric connection box from being flooded.

According to a second aspect of the present invention, a guide groove is provided in one of the pair of waterproof lid locking portions and the waterproof lid, and the other of the waterproof lid and the waterproof lid locking portion is engaged with the guide groove. Guide projections are provided.
According to the drainage structure, the waterproof lid can be reliably moved along the waterproof lid locking portion, and the waterproof lid can reliably close the lower end opening of the drain hole wall.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 shows a lower case 10 of an electric junction box that houses and mounts a bus bar, a fuse, a relay, and the like, and a bottom wall 11 of the lower case 10 is inclined downward toward a central portion so that the central portion is the lowest. You have set. The lower case 10 and the upper case (not shown) which are combined with the lower case to form an electric connection box are integrally formed of resin using a mold.

As shown in FIGS. 2 (A), 2 (B), 2 (C) and 3, a rectangular drain hole 12 is opened in the center of the lower case bottom wall 11. As shown in FIG. On the case bottom wall 11,
A rectangular cylindrical drain hole wall 13 protrudes from the peripheral edge of the drain hole 12, and a pair of waterproof lid engaging portions 14, 14 protrudes from the lower end of the drain hole wall 13. At the lower ends of the waterproof lid locking portions 14, 14, locking claws 14a, 14a project inward, respectively.
Both ends of the separate waterproof lid 15 are placed by 14a.

The pair of waterproof lid locking portions 14 and 14 has an outer frame portion 14b having the same width as the inner drainage hole portion 13a of the drainage hole wall 13, and a pair of sides protruding from both ends of the outer frame portion 14b. It has a U-shaped cross section composed of the frame portions 14c, 14c, and the locking claw 14a protrudes from its lower end to close the lower end. Further, the outer frame portion 14b and both side frame portions 14c, 14c
Are defined as guide grooves 17. The drain hole wall 13 is provided with a concave groove continuous with the guide groove 13.

The waterproof lid 15 has a rectangular shape having the same outer shape as the drain hole wall 13, and is provided at a position opposed to the pair of waterproof lid locking portions 14 so as to penetrate the waterproof lid locking portion 14.
a is provided. Guide projections 18 and 18 are formed on the inner surface of the recess 15a so as to be engaged with the guide groove 17 and to be locked on the upper surface of the locking claw 14a. It can move up and down along. The guide projections 18, 18 are provided with inclined surfaces 15c, 15c inclined downward toward the outside.

While the guide groove is provided on the waterproof cover 15,
A guide projection may be provided on the waterproof lid locking portion 14. Also,
The structure for guiding and holding the vertical movement of the waterproof lid 15 is not limited to the guide groove and the guide protrusion, but may be any configuration that allows the vertical movement of the waterproof lid 15 along the waterproof lid locking portion 14.

A waterproof lid 15 separate from the lower case 10
Are molded by resin, and then pushed from below between a pair of waterproof lid locking portions 14 and assembled.
In the assembled state, the guide projections 18 of the waterproof lid 15 are movably mounted on the upper surface of the locking claw 14a of the waterproof lid locking portion 14, and the assembled state is maintained.

According to the electric junction box having the drainage structure, the water immersed in the electric junction box is not covered by the case bottom wall 11.
To the drain hole 12 along the inclination of the case bottom wall 11.
Through the inner drain hole 13a of the drain hole wall 13 to the outside through the lower end opening 13b.
It is discharged from the opening between 4 and 14.

On the other hand, if the washing water rises from below the electric junction box due to the water pressure when the automobile is washed, the water is first supplied to the waterproof lid 15 placed on the locking claw 14a.
Abut. Thereby, as shown in FIGS. 4A and 4B, the waterproof lid 15 is raised along the waterproof lid locking portion 14 by water pressure, and the waterproof lid 15 closes the lower end opening 13b of the drain hole wall 13. And prevent the inside of the electrical junction box from being flooded.

Water that is not subjected to pressure due to rain or the like does not enter the electric connection box through the drain hole 12 provided at the lower end of the electric connection box.

As described above, in the drainage structure for an electric junction box according to the present invention, water that has entered the interior of the electric junction box from above can be dropped downward and discharged to the outside through the drain holes 12 and can enter from below. Water can be prevented from entering by the waterproof lid 15, so that it is possible to prevent water from accumulating inside the electric connection box and corrode metal parts such as bus bars housed inside the electric connection box.

[0020]

As is apparent from the above description, in the drainage structure for an electric junction box according to the first aspect of the present invention, the waterproof lid is moved upward by water pressure to close the lower end opening of the drain hole wall. Therefore, when washing a car, etc., even if water tries to enter through the drain hole at the lower end of the electrical connection box,
Intrusion of water can be reliably prevented. Also, at normal times, the waterproof lid is held on the locking claws and the lower end of the drain hole wall is opened, so that water entering from above the electrical connection box is discharged from the drain hole through the drain hole. It can be reliably discharged to the outside of the connection box. Therefore, it is possible to prevent inconveniences such as corrosion of metal parts such as bus bars housed inside the electric connection box.

In the drainage structure for an electric junction box according to the second aspect, since the guide groove and the guide protrusion guide the vertical movement of the waterproof lid, the lower end opening of the drain hole wall is closed by the waterproof lid. Thus, intrusion of water can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a front view of a lower case of an electric junction box according to the present invention.

FIG. 2 shows a drainage structure provided in a lower case of FIG. 1,
(A) is a bottom view, (B) is a II sectional view of (A),
(C) is a II-II sectional view of (A).

FIG. 3 is a perspective view showing a cross section of a part of a drainage structure provided in a lower case.

FIGS. 4A and 4B are cross-sectional views showing a moving state of a waterproof lid.

FIGS. 5A and 5B are cross-sectional views showing a conventional drainage structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lower case 11 Bottom wall 12 Drain hole 13 Drain hole wall 13b Lower end opening 14 Waterproof lid locking part 14a Locking claw 15 Waterproof lid 17 Guide groove 18 Guide projection

Continuation of the front page (56) References JP-A-8-178101 (JP, A) JP-A-3-34618 (JP, A) JP-A-8-322124 (JP, A) JP-A-63-131519 (JP) , U) Fully open 1988-172215 (JP, U) Fully open 60-127170 (JP, U) Fully open 55-144661 (JP, U) Fully open 2-1114320 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 3/08-3/20

Claims (2)

(57) [Claims] 1. A drain hole wall protrudes from a case bottom wall of an electric junction box, and a pair of waterproof lid locking portions is protruded from a lower end of the drain hole wall so as to face each other. At the lower end of the wall, a locking claw is protruded inward, and the waterproof claw is placed with the both ends held by the locking claw, and the waterproof lid is raised by water pressure from below to open the lower end of the drain hole wall. The drainage structure of the electrical junction box, which is configured to close off. 2. A guide groove is provided in one of the pair of waterproof lid locking portions and the waterproof lid, and a guide engaging with the guide groove is formed in one of the waterproof lid and the waterproof lid locking portion. The drainage structure for an electric junction box according to claim 1, wherein a projection is provided.