JP2758119B2 - 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 an electric junction box used for wiring in a vehicle.

[0002]

2. Description of the Related Art An electric junction box of an automobile houses components such as a fuse and a relay therein, and various electric wires are connected to these components directly or through a connector or the like.
It usually comprises a case and a cover that covers the opening.

[0003] In recent years, as the number of electrical components has increased, the installation density of components and wiring in the electrical junction box has also increased, and the problem of heat generation of components and the like has increased.

[0004] As an electric connection box to cope with this,
Conventionally, the one described in Japanese Utility Model Laid-Open Publication No. 3-83419 is known.

As shown in FIG. 5, one of the electric connection boxes described in this publication includes a main body 1, a lower cover 3 for closing a lower surface thereof, and an upper cover 5 for closing an upper surface opening thereof.
Consists of The main body 1 is engaged with the upper cover 5 and the lower cover 3 by engagement mechanisms 13 and 14 provided on the outer wall surface. Electrical components such as a relay 7 and a fuse 9 are disposed in the main body 1. In this electrical junction box, a ventilation hole 11 is opened in the side surface of the upper cover 5 to take in outside air and radiate internal heat.

In this case, the vent hole 11 is desirably provided on the upper surface because the warmed air inside the electric connection box rises. However, in this case, water easily enters from the outside. Therefore, it is provided on the side to prevent water from entering from the outside,
As shown in FIG. 6, the inside opening is set at a higher position than the outside opening of the ventilation hole 11.

In addition, as shown in FIG. 7, a ventilation hole 17 is provided on the upper surface of the upper cover 15 and a bent pipe 19 is provided outside the ventilation hole 17 to prevent water from entering. As shown in FIG. 8, a plurality of narrow air holes 27 are provided on the side surface of the upper cover 25, and as shown in FIG. Some are designed to prevent it.

[0008]

However, in the above-described conventional electric junction box, it has been difficult to achieve both prevention of water intrusion and improvement of ventilation efficiency.

The present invention has been made in consideration of the above circumstances, and has as its object to provide an electric junction box that can reliably prevent water from entering and improve ventilation efficiency.

[0010]

SUMMARY OF THE INVENTION According to the present invention, there is provided an electric connection box having a main body and an upper cover for closing an upper opening of the main body, wherein the upper surface of the upper cover is formed by an inclined surface, and a vent hole is formed on the top. While forming, on the upper part of the upper cover,
A waterproof cover having a ventilation hole is placed at a position shifted from the ventilation hole.

[0011]

In the electric junction box having the above structure, the heated air inside rises along the inclined upper surface of the upper cover and exits through the vent hole at the top. Then, the heat is radiated to the outside through the ventilation holes of the waterproof cover. On the other hand, when the water enters through the ventilation hole of the waterproof cover, the water does not reach the ventilation hole at the top of the upper cover, but flows down along the inclined upper surface and is discharged. Therefore, infiltration of water into the electric junction box is reliably prevented.

[0012]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of the electric junction box of the embodiment. The electric connection box includes a main body 1 and a lower cover 3,
An upper cover 50 that covers the upper opening of the main body 1 and a waterproof cover 52 that covers the upper portion of the upper cover 50 are provided. The main body 1 and the lower cover 3 are the same as the conventional one.

The upper cover 50 has a rectangular shape in plan view, and has an upper surface formed by an inclined surface which is inclined downward from one end in the longitudinal direction to the other end. A rectangular ventilation hole 54 long in the width direction is formed at the top, that is, at one end of the inclined upper surface. The main body 1, the lower cover 3, and the upper cover 50 are provided with a locking mechanism 1 as in the prior art.
3 and 14 are provided. As shown in FIG. 2, a downward concave groove 51 that fits into the opening edge of the main body 1 is formed in the peripheral edge of the side surface of the upper cover 50, and the packing 2 is disposed in the concave groove 51. Have been. In addition, a step portion 50a on which the lower edge of the side surface of the waterproof cover 52 rides is formed above the portion where the concave groove 51 is formed. An appropriate gap or drain hole is provided between the step 50a and the lower edge.

On the other hand, the waterproof cover 52 is formed such that the upper surface thereof is horizontal when the waterproof cover 52 is mounted on the upper cover 50. A long rectangular ventilation hole 56 is formed.

Next, the operation will be described with reference to FIG.

When the internal air is heated by the heat generated by the relays 7 and the fuses 9 of the electric connection box, the heated air rises, and the air holes 54 of the upper cover 50 and the prevention cover 5 are heated.
Through the second ventilation hole 56, follow the path A shown by the dotted line and go out of the electric junction box. On the other hand, ventilation holes 5
6 causes water to enter through the ventilation holes 56, but the water falls on the inclined upper surface of the upper cover 50, flows down along the inclination, and goes out along the path B shown by a solid line. . Therefore, water does not enter the main body 1 covered with the upper cover 50.

FIG. 3 is a perspective view showing an upper cover 60 and a waterproof cover 62 according to another embodiment of the present invention. The upper surface of the upper cover 60 of this embodiment has a rectangular upper surface inclined downward from one end in the width direction to the other end, and a vent hole 64 is provided at the top, that is, at one end. On the other hand, a ventilation hole 66 is provided on the end opposite to the ventilation hole 64 on the prevention cover 62 side.

FIG. 4 is a perspective view showing an upper cover 70 and a waterproof cover 72 according to still another embodiment of the present invention. In the upper cover 70 of this embodiment, the center of the upper surface is highest, and the upper surface of the upper cover 70 is formed by an inclined surface that is inclined downward from the apex to four sides. A vent hole 74 is formed at the central apex. On the other hand, the waterproof cover 72 side has ventilation holes 7 at peripheral positions, ie, four corners, which are separated from the central ventilation hole 74.
6 are provided.

In these embodiments, the same effects as in the above embodiment can be obtained.

[0021]

As described above, according to the present invention,
Since the air is radiated to the outside by using the rise of the warm air, the ventilation efficiency is improved. Further, even if water enters through the ventilation holes of the waterproof cover, the water does not reach the ventilation holes of the upper cover, so that there is no possibility that water will enter the main body from the ventilation holes. Therefore, both improvement of ventilation efficiency and reliable waterproofing can be achieved.

[Brief description of the drawings]

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

FIG. 2 is a side sectional view used for describing the operation of one embodiment of the present invention.

FIG. 3 is a perspective view showing an upper cover and a waterproof cover according to another embodiment of the present invention.

FIG. 4 is a perspective view showing an upper cover and a waterproof cover according to still another embodiment of the present invention.

FIG. 5 is a perspective view of a conventional electric junction box.

FIG. 6 is a detailed sectional view of a main part of FIG. 5;

FIG. 7 is a perspective view showing another conventional upper cover.

FIG. 8 is a perspective view showing still another conventional upper cover.

FIG. 9 is a sectional view of a main part of FIG.

[Explanation of symbols]

 1 Body 50, 60, 70 Upper cover 52, 62, 72 Waterproof cover 54, 64, 74 Ventilation holes 56, 66, 76 Ventilation holes

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02G 3/14 H01R 13/52 H02G 3/16 H05K 5/02

Claims (1)

(57) [Claims] 1. An electric connection box comprising a main body and an upper cover closing an upper opening of the upper cover, wherein an upper surface of the upper cover is formed by an inclined surface, and a vent hole is formed at a top portion of the upper cover. An electric connection box, wherein a waterproof cover having a ventilation hole is placed on an upper part thereof at a position shifted from the ventilation hole.