JP3404459B2 - Waterproof 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 waterproof structure for an electric connection box for housing electric components of a vehicle such as an automobile.

[0002]

2. Description of the Related Art FIG. 3 is an assembly sectional view showing a waterproof structure of an electric junction box described in Japanese Patent Laid-Open No. 8-322124. In this case, the present invention relates to a waterproof structure of an electric connection box 1 mounted in an engine room of an automobile, and has a box-shaped box body 2 for accommodating various electric components, and the box body 2 is covered by a lid body 6 at an upper portion. It is blocked. The bottom portion 3 of the box body 2 is provided with a draining slope that is inclined toward the center thereof, and the drain hole 4 is provided at the center of the lower portion of the inclination. The water drain hole 4 communicates with the external environment outside the vehicle body by a drain pipe (not shown) or the like.
The electric connection box 1 having such a shape is mounted and fixed to the mounting wall surface 7 on the vehicle body side via the mounting bracket 5.

[0003]

By the way, in the waterproof structure of the electric junction box shown in FIG. 3, the box main body 2 is used.
Since the water drainage hole 4 provided in the bottom portion 3 of the vehicle directly communicates with the external environment outside the vehicle body, rainwater or the like may flow back from the external environment and enter the box body 2 through the water drainage hole 4. As a result, there is an inconvenience that the electrical components housed in the box body 2 are adversely affected.

Therefore, an object of the present invention is to provide a waterproof structure which can be suitably used especially in an electric connection box mounted on a vehicle and which can prevent backflow of rainwater and the like to protect the electrical components housed therein from infiltration water. Especially.

[0005]

A waterproof structure for an electric junction box according to a first aspect of the present invention has a box main body which is mounted on a substantially vertical wall surface of a mounting body and accommodates various electric components. In an electrical connection box comprising a bottom plate whose box body is closed by a lid and four side walls, one of the four side walls of the box body is a drainage space which is provided outside the wall surface and communicates with the outside of the mounting machine body. The bottom plate is formed so as to be attachable to the wall surface of the attachment machine body through a portion, and the bottom plate is formed with a draining slope by a downward inclined surface toward a side wall attached to the wall surface, and a corner portion of a boundary between the side wall and the bottom plate And a drain hole communicating with the drainage space is provided.

With this structure, the drainage hole provided in the box body is indirectly communicated with the outside of the mounting machine body by the drainage space outside the wall surface, that is, it is not directly communicated with the outside of the mounting machine body. It is possible to prevent rainwater or the like from flowing back from the outside environment and intrude into the box body through the water drain hole, and protect the electrical components housed in the box body from infiltration water.

According to a second aspect of the present invention, there is provided a waterproof structure for an electrical junction box, wherein the drainage space is formed by enclosing plates provided on the upper, lower, left and right sides of one of the side walls so as to surround the drainage hole from the outside. is doing.

With this construction, the enclosure plate protects the drain hole by covering it from the outside, so that water such as rainwater does not directly enter the drain hole from the outside of the mounting machine body.

Further, in the waterproof structure of the electrical junction box according to the present invention, the bottom portion forming the drainage space portion is located lower than the drainage hole, and backflow water from the outside of the mounting machine body is provided. Can be prevented from penetrating into the box body through the drain hole through the bottom of the drainage space.

With such a structure, the backflow of rainwater from the external environment that has entered the bottom of the drainage space does not go over the drainage hole on the box body side, and backflow can be prevented.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a waterproof structure for an electric connection box according to the present invention will be described in detail with reference to the drawings. 1 and 2 are an assembly perspective view and an assembly side cross-sectional view showing the structure of the present embodiment. In this case, the electric junction box 10 is attached and fixed to the attachment wall surface 20 in the engine room of the vehicle body such as an automobile.

The box body 11 of the electric junction box 10 has four side walls 13 standing vertically from the bottom plate 12, and the lid body 14 can be dropped and closed at the upper end opening of the four side walls 13. The bottom plate 12 is formed so as to have a water draining slope with an appropriate downward inclination angle θ toward the mounting wall surface 20. At the corner of the boundary between the lowermost part of the bottom plate 11 which is inclined downward and the lowermost end of one of the four side walls 13 (hereinafter referred to as the mounting side wall 13A for convenience), the mounting side wall 13A is moved from the inside to the outside. Through drain hole 15
Is provided.

Further, a space between the mounting side wall 13A and the mounting wall surface 20 facing the mounting side wall 13A is formed as a narrow passage-shaped drainage space portion 16 communicating with the external environment outside the vehicle body. The mounting side wall 13A is provided on the outside of the wall surface with an enclosing plate formed of an upper top plate 13a, a lower bottom plate 13b, and left and right side plates 13c so as to project outward from the upper, lower, left, and right sides. The water drain hole 15 is covered from the outside by the surrounding plate so that water such as rainwater does not directly reach the water drain hole 15 from the outside of the vehicle body. Further, each of the left and right side plates 13c is provided with a mounting flange 13d bent at a right angle. The entire electric junction box 10 is fixed to the vehicle body side mounting wall surface 20 by the left and right mounting flanges 13d. Therefore, the drainage space 16
Is the width of the top plate 13a protruding outside the mounting side wall 13A.
And the length of the bottom plate 13b overhang.

Further, the bottom plate 1 in the drainage space portion 16
As is clear from the figure, 3b is formed with a slope so that the water drain hole 15 is located at a higher position. Therefore, rainwater or the like from the external environment that has flowed back from the drainage space 16 to the bottom plate 13b can never flow back up into the inside of the box body 11 over the upper drainage holes 15.

On the contrary, in order to prevent water and water droplets from staying inside the box body 11, the water and water droplets are discharged from the water draining hole 15 to the drainage space 16 through the inclined surface provided as the water draining slope of the bottom plate 12. From here, it is drained to the outside environment outside the vehicle body by a drainage tube or the like. Therefore, in the box body 11, the stored electrical components are protected from being adversely affected by the retention of water and water droplets.

[0016]

As described above, in the waterproof structure of the electrical junction box according to the present invention, the water drain hole provided in the box body is indirectly communicated with the outside of the mounting body such as the vehicle body through the drainage space. As in the conventional case, it is possible to prevent rainwater or the like from flowing back through the drain hole and entering the box body, and protect the stored electrical components.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a waterproof structure for an electrical junction box according to the present invention.

FIG. 2 is an assembled side sectional view of the same embodiment.

FIG. 3 is an assembled side sectional view showing a waterproof structure of a conventional electrical junction box.

[Explanation of symbols]

10 electrical junction box 11 box body 12 Bottom plate 13 side walls 13A mounting side wall 14 Lid 15 Drainage hole 16 Drainage space 20 Mounting wall surface of vehicle body

Continuation of the front page (56) Reference JP-A-10-224948 (JP, A) JP-A-9-93757 (JP, A) Actual opening 3-34618 (JP, U) Actual opening 5-53106 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02G 3/16 H01R 13/52 H02G 3/08

Claims (5)

(57) [Claims] 1. An electrical junction box having a box body mounted on a substantially vertical wall surface of a mounting body for accommodating various electrical components, the box body being composed of a bottom plate closed by a lid and four side walls. In, while forming one of the four side walls of the box body so as to be attachable to the wall surface of the mounting machine body via a drainage space portion that communicates with the outside of the mounting machine body provided outside the wall surface,
The bottom plate is formed with a downward draining slope toward the side wall attached to this wall surface, and a drain hole communicating with the drainage space is provided at a corner of a boundary between the side wall and the bottom plate. The waterproof structure of the electrical junction box is characterized by 2. The electricity according to claim 1, wherein the drainage space portion is formed by enclosing plates provided on the upper, lower, left and right sides of one wall surface of the side wall so as to surround the drain hole from the outside. Waterproof structure of junction box. 3. The water generated in the box body or the invaded water can be discharged to the outside of the mounting machine body through the drainage space through the drainage hole. The waterproof structure of the electrical junction box according to 1 or 2. 4. The bottom portion forming the drainage space is located lower than the drainage hole, and backflow water from the outside of the mounting body passes through the bottom of the drainage space to form the drainage hole. 4. The waterproof structure for an electrical junction box according to claim 1, wherein the waterproof structure can prevent the intrusion into the box body. 5. The electrical junction box according to claim 4, wherein the drainage space is provided at the bottom thereof with a draining slope by a downward slope with the drainage hole side as an upstream side and a downstream side. Waterproof structure.