JPH10341514A - Electric connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connection box which can protect electrical equipment by, even if water invades the electric connection box, suppressing the electrical equipment from being brought into contact with water. SOLUTION: An electric connection box 11 is provided with a taking-out opening 20 for taking out wiring to the outside, and a lower case 14 whose upper surface is open and formed into a box shape, an electrical equipment storage block 13 formed with relay mounting parts 15 which are stored in the lower case 14 and used so as to mount relays 16, and an upper cover 12 of box shape which is fitted on the lower case 14 whose lower surface is open. The taking-out opening 20 is disposed lower than the position of a connection part 17 in such a condition as the electrical equipment storage block 13 may be stored in the lower case 14. The lower end of the upper cover 12 is disposed lower than the position of the connection part 17 in such a condition as the upper cover 12 is fitted on the lower case 14.

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 disposed in, for example, an engine room of an automobile.

[0002]

2. Description of the Related Art Conventionally, this type of electric junction box accommodates various electric components such as an electric circuit and a relay for an automobile, and is arranged in an engine room of the automobile as a connection branch point of wiring such as a wire harness. It is installed and used.

[0003] In general, a junction box (J / B) as such an electric connection box includes a lower case, an electric component housing block housed in the lower case, and an upper cover fitted to the lower case. It is composed of Then, the electric connection box is waterproofed by fitting the upper cover to the lower case.

[0004]

However, the lower case is provided with an outlet for taking out wiring such as a wire harness to the outside. For this reason, a gap is generated between the inner peripheral surface of the outlet and the wiring, and the waterproofness of the electric connection box is limited. Also, since the upper cover is merely fitted to the lower case, there is a limit to the waterproofness of the electric connection box as described above. As a result, water may enter the electrical junction box, and at that time, electrical components such as relays mounted on the electrical component housing block may become conductive, for example, activating a starter or the like of an automobile. Was. When the starter or the like operates without permission, a battery as a power source is consumed, and for example, there is a possibility that a power window or the like of an automobile may not operate.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an electric connection box capable of suppressing contact of water with electric components and protecting the electric components. Is to do.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, there is provided an electric connection box provided with an outlet for taking out a wiring and having a box-shaped upper surface opened. A lower case, an electric component housing block accommodated in the lower case and provided with an electric component mounting portion for mounting electric components, and a box-like shape fitted to the lower case and having an open lower surface. The gist is that the outlet is arranged lower than the position of the connection portion with the electrical component mounted on the electrical component mounting portion.

According to the second aspect of the present invention, in the electrical junction box according to the first aspect, the lower end of the upper cover is moved from the position of the connection portion in a state where the upper cover is fitted to the lower case. The gist is that it is placed low.

According to a third aspect of the present invention, in the electrical junction box according to the first or second aspect, the gist is that the connection portion is displaced laterally from above the outlet.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an electric junction box according to an embodiment of the present invention. As shown in FIGS. 1 and 3, the electric connection box 11 includes the upper cover 1.
2. It is composed of an electrical component storage block 13 and a lower case 14. The upper cover 12 has a box shape with an open lower surface. The lower case 14 has a box shape with an open upper surface, and is formed so that the upper cover 12 can be fitted thereon.

As shown in FIGS. 1 to 3, the electric component housing block 13 is formed in a substantially rectangular parallelepiped shape that can be housed in the lower case 14, and has a wire harness (not shown) as a wiring. In addition, an electric circuit and the like constituted by a bus bar and the like are housed in the electric component housing block 13.

As shown in FIGS. 1 and 3, on the upper surface of the electrical component housing block 13, there are provided a plurality of relay mounting portions 15 as electrical component mounting portions. A relay 16 is mounted. In this case, the upper surface of the relay mounting portion 15 and the relay mounting portion 15
The contact portion with the relay 16 attached to the connector 17 becomes the connection portion 17. Note that the relay mounting portion 15 is
3 and is integrally formed with the electrical component housing block 13.

As shown in FIGS. 1 and 2, the lower case 1
A mounting arm 18 protrudes from the side surface of 4, and a bolt insertion hole 19 is formed in the mounting arm 18. The electric connection box 11 is fixed to the engine room by inserting a bolt (not shown) into the bolt insertion hole 19 of the mounting arm 18 and screwing the bolt to the inner wall of the engine room of the automobile. Further, a bottom wall of the lower case 14 is provided with a pair of outlets 20 which form a circular hole, and the wire harness is exposed to the outside from the outlet 20.

Next, a characteristic portion of the present embodiment will be described. As shown in FIG. 3, in the present embodiment, in a state where the electrical component accommodation block 13 is accommodated in the lower case 14,
The outlet 20 is arranged so as to be lower than the position of the connection part 17. Further, from above, the upper cover 1 is attached to the lower case 14 while the upper cover 12 is fitted to the lower case 14.
2 are arranged so that the lower end thereof is lower than the position of the connection portion 17. Further, as shown in FIGS. 1 and 2, on the upper surface of the electrical component storage block 13, the relay mounting portion 15 is disposed so as to be displaced laterally from above a pair of outlets 20 provided in the lower case 14, The relay 16 is mounted at a position away from the outlet 20.

The operation and effect of this embodiment will be described below. In the present embodiment, as shown in FIGS. 4 and 5, even if the water 21 enters the electrical connection box 11 from the outlet 20,
An air space is secured in the electric connection box 11. Therefore, the air layer secured in the electrical junction box 11 can prevent water from contacting the connection portion 17 with the relay 16 mounted on the relay mounting portion 15 and protect the relay 16. As a result, since the water 21 does not come into contact with the connection portion 17, it is possible to prevent the starter of the automobile from operating without permission and the battery as the power supply from being consumed without permission. As a result, it is possible to prevent the power window and the like of the automobile from being inoperative. In particular, as shown in FIG. 5, even when the water level outside the electric connection box 11 is higher than the lower end of the upper cover 12, the pressure of the air layer inside the electric connection box 11 is high, so that the lower cover 12 Water 21 does not easily enter the electric connection box 11 from the portion fitted to the case 14. Therefore,
Even in the state shown in FIG. 5, the same operation and effect as those in the state shown in FIG. Further, in the state shown in FIG. 5, since the lower end of the upper cover 12 is located below the connecting portion 17, even if water invades from between the upper cover 12 and the lower case 14, Water can be suppressed from reaching the connection portion 17. -In addition, even when the electric connection box 11 is inclined with respect to the water surface, since the connection portion 17 is located at a position separated from the upper side of the outlet 20 to the side, the water 21 is supplied to the connection portion 17. Difficult to contact.

The present invention is not limited to the above-described embodiment, but may be implemented as follows, with a part of the configuration being appropriately changed without departing from the spirit of the invention. As shown by a two-dot chain line in FIG. 3, the height of the upper cover 12 is made higher than that of the above-described embodiment, and the height of the electrical component housing block 13 is made higher correspondingly. Since the electric connection box 11 is provided in the engine room, the height of the upper cover 12 may be increased as long as the electric connection box 11 is large enough to be accommodated in the engine room. . In the electric connection box 11, the lower case 1
At least one of the upper cover 4 and the upper cover 12 is provided with a fixing means. In the electric connection box 11, a seal packing is provided between the upper cover 12 and the lower case 14. In addition, a seal packing is provided between the outlet 20 and the wire harness. With this configuration,
The airtightness of the electric connection box 11 can be improved. In the above embodiment, the outlet 20 is connected to the lower case 14.
However, it may be formed on the side surface of the lower case 14.

[0016] The "electric junction box" referred to in this specification is:
It means all aspects of the intervening existence provided for housing various electrical components and connecting them to wiring such as a wire harness, and is not limited to a so-called junction block (J / B). Absent.

[0017]

Since the present invention is configured as described above, it has the following effects. According to the first aspect of the present invention, since the outlet is provided at a position lower than the position of the connection portion, even if water enters the electric connection box,
It is easy to secure an air space above the connection in the electrical junction box. Therefore, when water enters the electric connection box, the air layer secured in the electric connection box can prevent water from contacting the electrical components and protect the electrical components.

According to the invention of claim 2, according to claim 1,
In addition to the effects of the invention described in the above, since the lower end of the upper cover is disposed lower than the position of the connection portion, even if water enters the electrical connection box from the portion where the upper cover is fitted to the lower case, It is easy to secure an air space above the connection in the electrical junction box.

According to the invention of claim 3, according to claim 1,
Or, in addition to the effects of the invention described in 2, since the connecting portion is disposed so as to be displaced laterally from above the outlet, even if the electric connection box is inclined, water contacts the connecting portion. Can be suppressed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an electric connection box of the present invention.

FIG. 2 is a plan view showing a state in which an upper cover has been removed from the electric junction box.

FIG. 3 is a partial cross-sectional view showing one embodiment of the electric junction box of the present invention.

FIG. 4 is a partial cross-sectional view showing the operation of the electric junction box according to one embodiment.

FIG. 5 is a partial sectional view showing the operation of the electric junction box in one embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Electric connection box, 12 ... Upper cover, 13 ... Electrical component accommodation block, 14 ... Lower case, 15 ... Relay mounting part as electrical component mounting part, 16 ... Relay as electrical component, 17 ... Connection part, 20 ... Outlet, 21 ... water.

Claims (3)

[Claims] 1. A box-shaped lower case provided with an outlet for taking out wiring to the outside and having an open top surface, and an electric component mounting part for being accommodated in the lower case and for mounting electric components. An electrical component housing block provided with: an upper cover in the form of a box fitted to the lower case and having an open lower surface, at a position of a connection portion with the electrical component mounted on the electrical component mounting portion. On the other hand, an electric connection box in which the outlet is arranged low. 2. The electric junction box according to claim 1, wherein a lower end of the upper cover is disposed lower than a position of the connection portion in a state where the upper cover is fitted to the lower case. 3. The electric junction box according to claim 1, wherein the connection portion is disposed so as to be displaced laterally from above the outlet.