JP2556646Y2 - Electric junction box with heat pipe - 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 with a heat pipe used for wiring inside a vehicle.

[0002]

2. Description of the Related Art An electric connection box for an automobile is one in which a busbar, a connector, a fuse, a relay and the like for forming a predetermined electric circuit are incorporated in a plastic case. In recent years, the following problems have occurred in such an electrical junction box with the increase in the number of automotive electrical components.

That is, the size of the electric junction box is limited due to the space of the installation place. Under such restrictions, when the number of electric components of the automobile increases, the number of parts such as fuses and relays increases, and the electric junction box increases. The density of the connection circuit inside becomes high. As a result, the number of heat-generating portions such as components and conductor connection portions increases, and the overall temperature rises as a result, so that local overheating easily occurs in the components and connection portions. When such local overheating occurs, the case may be melted or thermally deformed, and there is a problem in reliability.

Therefore, in order to dissipate the heat in the electric junction box to the outside, the electric junction box is provided with a heat pipe having a heat pipe attached so that a heat absorbing portion is located inside the case and a heat radiating portion is located outside the case. It has been proposed (3-9
No. 7318).

[0005]

However, in the electric junction box disclosed in the above publication, the heat radiating portion of the heat pipe is located in a space outside the case. Normally, the electrical junction box is installed in the engine room, and the temperature inside the engine room becomes high. The temperature is high and the heat dissipation efficiency is not sufficient.

[0006]

SUMMARY OF THE INVENTION The present invention provides an electric connection box with a heat pipe, which solves the above-mentioned problems. The electric connection box has a heat absorbing portion in a case and a heat radiating portion in a case. In the electrical junction box with a heat pipe in which the heat pipe is attached so as to be located outside the case, the heat radiating portion of the heat pipe is arranged in the washer liquid of the washer tank.

[0007]

Since the temperature inside the washer tank is the lowest in the engine room, the heat radiation efficiency of the heat pipe can be increased by disposing the heat radiating portion of the heat pipe therein. In addition, since heat is released into the washer liquid, the temperature of the washer liquid increases, and when frost or ice adheres to a window glass or a light in winter, the heat can be used for thawing.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. The electrical connection box 11 includes a case body 17 incorporating components such as a fuse 13 and a relay 15, an upper case 19, and a lower case 21.
It is composed of A wire harness 23 is connected to the case body 17.

A heat pipe 25 is provided in the upper case 19.
Is attached. In the heat pipe 25, the heat absorbing portion 25a is located in the case, and the heat radiating portion 25b is located in the washer liquid 29 of the washer tank 27 in a state where the electric connection box 11 is installed at a predetermined position in the engine room. So that it is attached.

In this manner, the heat generated in the electric junction box 11 is absorbed by the heat absorbing portion 25a of the heat pipe 25, transported by the heat pipe 25 with little loss, and
From 25b, it is discharged into the washer fluid 29 having a low temperature.
As a result, efficient heat radiation can be performed, and the electrical junction box
It is possible to efficiently suppress the temperature rise in 11.

In the above embodiment, the heat pipe is attached to the upper case. However, the heat pipe can be attached to the case body or the lower case. In short, the heat absorbing portion of the heat pipe may be arranged in a portion of the electric junction box where the temperature is most likely to rise.

FIG. 2 shows another embodiment of the present invention. Although the electric connection box is not shown in FIG. 2, the heat radiating portion 25 b of the heat pipe 25 whose heat absorbing portion is located in the electric connection box is inserted from below the washer tank 27 and positioned in the washer liquid 29. Things. In this case, naturally, it is necessary to provide the seal 31 at the penetrating portion of the washer tank 27. Raising the heat radiating portion of the heat pipe 27 from the bottom in this way improves the heat radiating efficiency. FIG. 2 also shows a state in which the washer liquid 29 supplied by the pipe 33 is sprayed on the window glass 35 and the light 37.

The arrangement of the heat radiating portion of the heat pipe is not limited to the above embodiment. For example, the heat radiating portion may be inserted laterally from the side of the washer tank. Further, the heat radiating portion of the heat pipe may be assembled to a washer tank, and the heat absorbing portion may be inserted into the electric connection box.

By the way, as a method of using the heat pipe, the heat absorbing portion is attached to a heat-generating auxiliary device (motor, actuator, etc.) in the engine room, and the heat radiating portion is arranged in the washer tank to reduce the temperature rise of the auxiliary device. It is also conceivable to suppress them.

[0015]

As described above, according to the present invention, since the heat radiating portion of the heat pipe attached to the electric junction box is arranged in the washer fluid in the washer tank having the lowest temperature in the engine room, heat is radiated. The heat radiation efficiency from the part is increased, and the temperature rise in the electric connection box can be suppressed efficiently. Further, the washer liquid whose temperature has been raised by heat radiation can be effectively used to melt frost and ice attached to window glass, lights and the like in winter.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of an electric junction box with a heat pipe according to the present invention.

FIG. 2 is an explanatory view showing another embodiment of the present invention.

[Explanation of symbols]

11: Electrical connection box 13: Fuse 15: Relay 17: Case body 19: Upper case 21: Lower case 25: Heat pipe 25a: Heat absorbing section 25b: Heat radiating section 27: Washer tank 29: Washer liquid

Claims (1)

(57) [Scope of request for utility model registration] An electric connection box having a heat pipe attached to an electric connection box such that a heat absorbing portion is located inside a case and a heat radiating portion is located outside the case, wherein the heat radiating portion of the heat pipe is connected to a washer tank. An electric connection box with a heat pipe, which is arranged in a washer fluid.