JP2001314017A - Box construction having built-in electric component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect electric components inside a box from water, without increasing the number of required components and assembling man hours, even when high water pressure is applied like in jet cleaning, etc. SOLUTION: In a part of an upper cover 4 near its joining part to a lower cover 1, a leakage water lead-out portion 21 which leads out water having entered to the side of the internal surface of the lower cover 1, and discharges the water into the lower cover 1 is formed. In a inside part further than the lead-out portion 21, a water preventing wall 22 which is formed integrally as the peripheral wall of a relay box and a connection box body 2, and prevents entry of water into these, is formed. Besides, the upper cover 4 is provided with a peripheral wall portion 23 which covers the peripheral surface 20b of the brim portion 20 of the opening of the lower cover 1, and the peripheral surface of the lower cover 1 is provided with a touching protrusion 24 which the lower end surface 23a of the wall portion 23 touches.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a box structure for protecting a built-in electric component from water.

[0002]

2. Description of the Related Art For example, in an electric junction box mounted on an automobile, it is necessary to protect internal electric components from water. Conventionally, the outer periphery of the electric connection box is almost completely covered by the upper cover and the lower cover, and packing is interposed at the joint between the upper cover and the lower cover. That is, the intrusion of water from the mating portion between the upper cover and the lower cover is prevented by the close contact structure of the packing, thereby protecting the built-in electric components from the water.

[0003]

However, when packing is used as in the prior art, the number of parts and the number of assembling steps are increased accordingly. Further, when a water pressure exceeding the sealing force of the packing acts, the water penetrates, so it is difficult to completely prevent water from entering during high-pressure washing.

Accordingly, the present invention has been made to solve the above-mentioned problem, and is intended for a case where the number of parts and the number of assembling steps do not increase and a large water pressure acts such as high pressure washing. Another object of the present invention is to provide a box structure capable of protecting built-in electric components from water.

[0005]

According to a first aspect of the present invention, there is provided a lower cover having an opening at an upper portion, an electric component housed in the lower cover, and an upper cover for closing the opening of the lower cover. In the box structure in which the electric component is incorporated, the upper cover is disposed between an inner peripheral surface of an opening edge of the lower cover and an outer periphery of the electric component, and a joining portion of the upper cover and the lower cover is provided. A water infiltration portion for guiding water intruded from the inner surface of the lower cover to discharge water into the lower cover, and further inside the water inflow portion is integrally formed as an outer peripheral wall of the electric component. Further, a water intrusion prevention wall for preventing water from entering the electric component is provided.

In the box structure in which the electric parts are built in, the water that has entered from the portion where the upper cover and the lower cover are joined is guided by the flooded lead-out portion, guided to the inner surface side of the lower cover, and discharged into the lower cover. Therefore, even if water scatters in the direction of the electrical component due to vibration or the like at the time of discharging water from the lower end of the flooded outlet, the outer periphery of the electrical component is covered with the flood prevention wall. Therefore, the electric parts will not be flooded.

According to a second aspect of the present invention, there is provided a box structure including the electric component according to the first aspect, wherein the upper cover covers an outer peripheral surface of the opening edge of the lower cover, and the water is led out. An outer peripheral wall portion is provided so as to sandwich the opening edge of the lower cover between the lower cover portion and a contact protruding portion with which a lower end surface of the outer peripheral wall portion abuts on the outer peripheral surface of the lower cover. And

[0008] In the box structure incorporating the electric parts, in addition to the operation of the first aspect of the present invention, when water intrudes from the joint portion of the upper cover and the lower cover,
It is necessary to pass between the lower end surface of the outer peripheral wall of the upper cover and the abutting projection of the lower cover, and between the inner surface of the outer peripheral wall of the upper cover and the outer surface of the opening edge of the lower cover. Is prevented as much as possible.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show a case where a box structure incorporating an electric component of the present invention is applied to an electric junction box.
Is a sectional view of a main part of a box structure applied to an electric connection box, FIG. 2 is an exploded perspective view of the electric connection box, FIG. 3 is a cross-sectional view of the electric connection box, and FIG. 4 is a plan view of the electric connection box with an upper cover removed. FIG. 5 is an exploded perspective view of the connection box main body.

2 to 4, an electric connection box A includes a lower cover 1 having an opening 1a at an upper part, a connection box main body 2 and a relay box 3, which are electric components housed in the lower cover 1, and a lower part. Are opened 4a, and the upper cover 4 that closes the opening 1a of the lower cover 1, and the two connector frames 5, 6 attached to the lower cover 1 so as to close the opening 1b formed on the side surface of the lower cover 1.
It is mainly composed of The lower cover 1 and the upper cover 4 are made of synthetic resin, and the upper cover 4 has no holes other than the lower opening 4a. Although a drain hole 8 is provided at the lowest position where the water that has flowed down by its own weight, the structure is such that water does not enter as much as possible. The structure of the joining portion between the lower cover 1 and the upper cover 4 will be described below.

As shown in FIG. 5, the connection box body 2 has a main cover 10 having a large number of component mounting portions 10a on which components and the like are mounted on an upper surface, and an under cover that covers a lower surface of an inner space below the main cover 10. 11, a relay terminal 12 arranged in these internal spaces, and a wiring board 15 assembled with a bus bar 13 and an insulating plate 14 also arranged in the internal spaces. The relay box 3 is provided with a large number of component mounting portions 3a on its upper surface, and a component such as a relay is mounted on each of the component mounting portions 3a.

Next, the lower cover 1 and the upper cover 4
The structure of the matching portion will be described. As shown in detail in FIG. 1, the entire periphery of the lower end of the upper cover 4 is disposed between the inner peripheral surface 20a of the opening edge 20 of the lower cover 1 and the outer periphery of the junction box body 2 and the relay box 3. A water immersion lead-out portion 21 is provided for guiding water that has entered from a portion where the upper cover 4 and the lower cover 1 are joined to the inner surface side of the lower cover 1 and discharging the water into the lower cover 1. Further inside the inundation outlet 21, there is a connection box main body 2.
And integrally formed as an outer peripheral wall of the relay box 3,
In addition, an inundation prevention wall 22 for preventing ingress of water into the connection box main body 2 and the relay box 3 is provided.

The lower cover 1 covers the entire outer periphery 20b of the lower edge of the lower cover 1 around the lower end thereof. An outer peripheral wall portion 23 is provided so as to sandwich the outer peripheral wall portion 23. A contact projection 24a with which the lower end surface 23a of the outer peripheral wall portion 23 abuts is provided all around the lower cover 1 slightly below the opening edge portion 20. .

In the above configuration, the water that has entered from the portion where the upper cover 4 and the lower cover 1 are joined is guided by the flooded lead-out portion 21, guided to the inner surface side of the lower cover 1, and discharged into the lower cover 1. The connection box main body 2 and the relay box 3 are not flooded, and when the water is discharged from the lower end of the flooded lead-out portion 21, water is directed further inward of the lower cover 1, that is, the connection box main body. Even if the connection box body 2 and the relay box 3 are scattered in the direction, the connection box body 2 and the relay box 3 are not flooded because the outer peripheries of the connection box main body 2 and the relay box 3 are covered with the water blocking wall 22. The water that has entered the lower cover 1 evaporates or is eventually discharged to the outside through the drain hole 8 or the like.

That is, according to the above box structure, no packing is used (no packing), so that the number of parts and the number of assembling steps are reduced as compared with the structure using packing as in the conventional example. Also, since it is packing-less, water easily penetrates from the joint portion of the upper cover 4 and the lower cover 1 as compared with a structure using packing, and is particularly suitable for a case where a large water pressure acts such as high pressure washing. Water infiltrates. However, as described above, the built-in connection box main body 2 and the relay box 3 are not flooded by the water that has entered. As described above, the number of parts and the number of assembling steps are not increased, and the built-in connection box main body 2 and the relay box 3 can be protected from water even when a large water pressure acts such as high-pressure washing.

Also, in the box structure of the above embodiment,
The upper cover 4 covers the outer peripheral surface 20 b of the opening edge 20 of the lower cover 1, and the outer peripheral wall portion 23 sandwiches the opening edge 20 of the lower cover 1 between the upper cover 4 and the flooded lead-out portion 21.
Is provided on the outer peripheral surface of the lower cover 1, and a contact protruding portion 24 is provided on the lower peripheral surface 23 a of the outer peripheral wall portion 23, so that when water intrudes from a joint portion between the upper cover 4 and the lower cover 1. Passes between the lower end surface 23a of the outer peripheral wall 23 of the upper cover 4 and the contact protruding portion 24 of the lower cover 1, and between the inner surface of the outer peripheral wall 23 of the upper cover 4 and the opening edge 20 of the lower cover 1. Since it is necessary to pass between the outer surface and the water itself, the infiltration of water itself is prevented as much as possible, so that the connection box body 2 and the relay box 3 can be more reliably protected than water.

According to the above embodiment, the electric connection box A
Although the description has been given of the case where the connection box main body 2 and the relay box 3 are built in as the electric components to be built in the device, the types of the built-in electric components are of course not limited.

[0019]

As described above, according to the first aspect of the present invention, the upper cover is provided with a flooded lead-out portion for guiding the water that has entered into the inner surface side of the lower cover and discharging the water into the lower cover. Further, a water-intrusion prevention wall for preventing water from entering into the electric components is provided further inside the water-inflow outgoing portion, so that water intruding from a joint portion between the upper cover and the lower cover is guided to the water-inflow outflow portion and is guided to the lower inflow-out portion. Electric components are not flooded because they are guided into the inner surface of the cover and are discharged into the lower cover.Water scatters in the direction of the electric components due to vibration or other reasons when water is discharged from the lower end of the flooded outlet. Even if this is done, since the outer periphery of the electric component is covered with the flood prevention wall, the electric component will not be flooded, so the number of parts and the number of assembling steps will not be increased, and a large water pressure such as high pressure washing The internal electrical components even when the acting can be protected from water.

According to a second aspect of the present invention, there is provided a box structure incorporating the electric component according to the first aspect, wherein the upper cover has an outer peripheral wall portion covering an outer peripheral surface of the opening edge of the lower cover. The lower cover is provided with a contact projection on the outer peripheral surface of the lower cover, the lower end of the outer peripheral wall abutting on the outer peripheral wall. In this case, it passes between the lower end surface of the outer peripheral wall of the upper cover and the contact protrusion of the lower cover, and passes between the inner surface of the outer peripheral wall of the upper cover and the outer surface of the opening edge of the lower cover. Need
Since the permeation of water itself is prevented as much as possible, the electric components can be more reliably protected than water.

[Brief description of the drawings]

FIG. 1 shows one embodiment of the present invention and is a cross-sectional view of a main part of a box structure applied to an electric junction box.

FIG. 2 is an exploded perspective view of the electric junction box, showing one embodiment of the present invention.

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

FIG. 4 is a plan view of the electric junction box according to the embodiment of the present invention, from which an upper cover is removed.

FIG. 5 is an exploded perspective view of the connection box main body, showing one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Lower cover 1 a Opening 2 Connection box body (electrical component) 3 Relay box (electrical component) 4 Upper cover 4 a Opening 20 Opening edge 20 a Inner peripheral surface 20 b Outer peripheral surface 21 Inundation outlet 22 Inundation prevention wall 23 Outer peripheral wall 23 a Lower End face 24 Contact protrusion

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4E360 AB02 AB14 AB31 AB54 BC05 BD03 CA08 EA03 EA18 EA24 EA27 EC12 ED02 ED27 EE02 FA08 FA09 GA29 GB93 GB94 GC08 5G361 AA06 AB09 AC01 AC04 AC13 AE01

Claims (2)

[Claims] 1. A box structure in which an electric component including a lower cover having an open upper portion, an electric component housed in the lower cover, and an upper cover closing the opening of the lower cover is built in, wherein the upper The cover is disposed between an inner peripheral surface of an opening edge of the lower cover and an outer periphery of the electric component, and water entering from a joint portion of the upper cover and the lower cover is provided on an inner surface side of the lower cover. A lower part of the lower cover is provided integrally with an outer peripheral wall of the electric component, and water is introduced into the lower part. A box structure with built-in electrical components, characterized by providing a flood prevention wall for preventing water leakage. 2. The box structure incorporating the electric component according to claim 1, wherein the upper cover covers an outer peripheral surface of the opening edge of the lower cover, and is provided between the upper cover and the flooded lead-out portion. An electric component, wherein an outer peripheral wall portion is provided so as to sandwich the opening edge portion of the lower cover, and a contact protruding portion is provided on an outer peripheral surface of the lower cover with which a lower end surface of the outer peripheral wall portion abuts. Built-in box structure.