JPH1141748A - Electric connection case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the intrusion of water and to improve strength, by providing the correspondence between a top part provided at a lower cover and a concave part provided at an upper cover so that the upper part is closed, and arranging the inner lower end of the upper cover lower than each connecting part of an electric device. SOLUTION: At the outer upper part of the surrounding wall of a lower cover 11, a flange 14 and a step difference 15 are formed at the upper and lower sides. At the upper-end outside, a slant surface 16 is formed. At the outer wall of the lower cover 11, a plurality of hooks are formed as a unitary body. At the surrounding edge part of an upper cover 13, a skirt part 22 is formed along the outer surface. A coupling groove 23 wherein the upper part is closed and the lower part is opened, is provided at the part between the upper cover 13 and the skirt part 22. A step difference 24 in correspondence with the step difference 15 is formed at the skirt part 22. A slant surface 25 is formed at the lower-end outside of the upper cover 13. An engaging part is formed as a unitary body at the position in correspondence with a hook 17 formed at the upper cover 13 at the outer wall of the skirt part 22. Then, the upper closed part of the coupling groove 23 of the upper cover 13 is in contact with the upper end of the surrounding wall of the lower cover. The step difference 24 is in contact with the step difference 15. The lower end of the skirt part 22 is in contact with the flange 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical junction box for housing electrical components, and more particularly to an electrical junction box having improved strength and waterproof performance.

[0002]

2. Description of the Related Art Hitherto, various electric connection boxes have been proposed for accommodating various electric components such as junction boxes, relay boxes, fusible link boxes, and electronic control units used in electric circuits of automobiles. Then, in each of the above-mentioned electric connection boxes, it is necessary to prevent water from entering the inside and causing a short circuit or the like.

[0003]

However, when an electric junction box made of a synthetic resin or the like is placed in an engine room or the like, it may be deformed due to a high temperature.
Then, there is a possibility that a gap may be generated in the fitting portion between the lower cover and the upper cover that constitute the electric connection box due to this deformation.

In addition, during maintenance of the engine room, since the electric connection box has a flat upper surface, a heavy object such as a battery may be placed thereon. Also at this time, the electric connection box may be deformed and damaged by the load, or a gap may be formed in the fitting portion. When water enters through these gaps, a short circuit or the like may occur.

[0005] The present invention has been made to solve the above problems, and an object of the present invention is to provide an electric junction box in which water is prevented from entering and whose strength is improved.

[0006]

According to a first aspect of the present invention, there is provided a lower cover having an open upper surface, a connection stand disposed in the lower cover, to which electric components are connected, and upper surfaces of the lower cover and the connection stand. In the electrical connection box having an upper cover that covers the upper and lower covers, the convex portion provided on the lower cover and the concave portion having an upper portion closed on the upper cover correspond to each other in a concave-convex fitting relationship, and the connection portion of the electrical component Also, the gist is that the lower end inside the upper cover is arranged downward.

According to a second aspect of the present invention, in the electrical junction box according to the first aspect, an upper end of the convex portion formed on the lower cover is located above a connecting portion of the electrical component. Make a summary.

According to a third aspect of the present invention, there is provided a lower cover having an open upper surface, a connection table disposed in the lower cover and connected to an electrical component, and an upper cover for covering the lower cover and the upper surface of the connection table. In the electrical junction box having, the convex portion provided on the connection stand and the concave portion having an upper part closed on the upper cover correspond to each other in a fitting relationship of concave and convex,
The gist is that the inner lower end of the upper cover is disposed below each connection portion of the electrical component.

According to a fourth aspect of the present invention, in the electrical junction box according to the third aspect, an upper end of the convex portion formed on the connection stand is located above a connection portion of the electrical component. This is the gist.

The gist of the invention described in claim 5 is that the outer lower end of the upper cover is located at substantially the same height as the inner lower end.

[Detailed Description of the Invention]

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

The electric connection box 1 is composed of a lower cover 11 made of synthetic resin and having an open upper surface, a connection base 12 and an upper cover 13. Lower cover 11
A flange 14 and a step 15 are formed up and down on the outer upper portion of the peripheral wall. A slope 16 is formed outside the upper end of the peripheral wall of the lower cover 11. A plurality of hooks 17 are integrally formed on the outer wall of the lower cover 11.

The connection base 12 is housed inside the lower cover 11, and a connection portion 18 is provided on the upper surface thereof. By inserting the terminals 21 of various electrical components 20 such as relays into connection holes 19 provided in the connection portion 18, the various electrical components 20 are inserted.
Is mounted on the connection table 12. Upper cover 13
Is located at a position lower than the connecting portion 18. The upper end of the lower cover 11 is located at a position higher than the connection portion 18.

A skirt portion 22 is formed on the periphery of the upper cover 13 along the outer periphery. A fitting groove 23 is formed between the upper cover 13 and the skirt 22 with the upper part closed and the lower part opened.

A step 24 corresponding to the step 15 is formed in the skirt portion 22. A slope 25 is formed outside the lower end of the upper cover 13. Skirt 2
An engaging portion 26 is integrally formed on the outer wall of the second portion at a position corresponding to the hook 17 formed on the upper cover 13.

When closing the upper opening of the lower cover 11 with the upper cover 13, the slope 16 of the lower cover 11 moves the skirt portion 22 to the outside of the lower cover 11.
The slope 25 of the upper cover 13 guides the peripheral wall of the upper cover 13 to the inside of the lower cover 11. Therefore, the upper cover 13 can be easily and reliably covered on the lower cover 11.

In this state, the upper cover 13
The upper closed portion of the fitting groove 23 contacts the upper end of the peripheral wall of the lower cover 11, the step 24 contacts the step 15, and the lower end of the skirt portion 22 contacts the flange 14. Therefore, as in the case where a heavy object is placed on the upper surface of the upper cover 13, it is possible to firmly withstand the downward and opening loads on the upper cover 13.

The lower cover 11 enters the fitting groove 23, and the lower cover 11, the upper cover 13, and the skirt 22 form a triple wall. Therefore,
Deformation of the two covers 11, 13 due to high temperature or the like is unlikely to occur, and a gap is unlikely to occur. Further, it is possible to prevent water from entering the lower cover 11 from between the lower cover 11 and the upper cover 13.

Moreover, the skirt portion 22 comes into contact with the upper surface of the step 15 and the upper surface of the flange 14, and the peripheral wall of the upper cover 13 extends downward from the upper end of the peripheral wall of the lower cover 11. The length of the route is longer, and water intrusion can be more reliably prevented. In the event that water enters the lower cover 11, the connecting portion 18 to which the electrical component 20 is connected is located higher than the lower end of the upper cover 13. And the connection 18 is very unlikely to be exposed to water. In addition, since the upper end of the lower cover 11 is located higher than the connection portion 18, the possibility of water entering the connection portion 18 is extremely low.

(Second Embodiment) Next, a second embodiment of the present invention will be described. In the electric connection box 2 of the second embodiment, the upper cover 13 is attached to the connection base 31. The specific configuration will be described below. Also, members having the same configuration as in the first embodiment have the same reference numerals, and detailed description thereof will be omitted.

The electric connection box 2 according to the second embodiment also includes a lower cover 32, a connection base 31, and an upper cover 13 formed of a synthetic resin. In connection stand 31,
Similarly to the connection base 12 of the first embodiment, a connection part 18 having a connection hole (not shown) is provided on the upper surface thereof, and various electric components 20 can be mounted on the connection base 31.
A step 37 is formed on the upper part of the lower cover 32, and the connection table 31 is placed on the step 37.

Further, from the side wall of the connection base 31, a fitting wall 3 is formed.
4 protrudes upward. Outside the fitting wall 34, a flange 33 and a step 35 are formed vertically. A slope 36 is formed outside the upper end of the fitting wall 34. The lower surface of the fitting wall 34 is
Is in contact with the upper end surface of the

Since the structure of the upper cover 13 is the same as that of the first embodiment, a detailed description thereof will be omitted. The step 24 formed on the skirt portion 22 is the same as the step 3
5 is supported.

When the upper cover 13 is mounted on the connection base 31 to which the lower cover 32 is mounted, the slope 36 of the connection base 31 moves the skirt portion 22 outside the fitting wall 34 and the slope 25 of the upper cover 13 moves. The peripheral wall of the upper cover 13 is guided inside the fitting wall 34. Therefore, the upper cover 13 can be easily and reliably covered on the connection base 31.

At this time, the lower end of the peripheral wall of the upper cover 13 is located lower than the connecting portion 18. The upper end of the fitting wall 34 is located higher than the connection portion 18.

In this state, the upper cover 13
The upper closed portion of the fitting groove 23 is at the upper end of the fitting wall 34, the step 24 is at the step 35, and the lower end of the skirt portion 22 is the flange 3.
3 respectively. Therefore, the upper cover 13
Can firmly withstand a load in a downward direction and an opening direction with respect to.

The fitting wall 34 enters the fitting groove 23, and the fitting wall 34, the upper cover 13, and the skirt 22
Form a triple wall. Therefore, deformation of the connection base 31 and the upper cover 13 due to a high temperature or the like hardly occurs, and a gap is hardly generated. Further, it is possible to prevent water from entering the electric connection box 2 from between the fitting wall 34 and the upper cover 13.

Further, the skirt portion 22 comes into contact with the upper surface of the step 35 and the upper surface of the flange 33, and the peripheral wall of the upper cover 13 extends downward from the upper end of the fitting wall 34. The path leading to the water is longer, and the intrusion of water can be more reliably prevented.
If water intrudes into the connection base 31, the electrical components 2
Since the connecting portion 18 to which the “0” is connected is disposed at a position higher than the lower end of the upper cover 13, the intruded water flows downward along the inner wall of the fitting wall 34, and the connecting portion 18 may be covered with water. Is extremely small. In addition, since the upper end of the fitting wall 34 is located higher than the connecting portion 18, the possibility of water entering the connecting portion 18 is extremely low.

The above embodiments may be modified as described below, and the same operation and effect can be obtained in such a case. -It may be used for an electrical junction box such as an outdoor switchboard.

Although the embodiments have been described above, technical ideas other than the claims that can be grasped from the embodiments will be described below together with their effects. The electrical junction box according to any one of claims 1 to 5, wherein a fitting portion between the lower cover or the connection base and the upper cover has a step that engages with each other.

A flange is provided on the outer side of the peripheral wall of the lower cover or the connection stand, and a lower end of the upper cover is in contact with an upper surface of the flange.
Electrical connection box according to the paragraph.

With this configuration, the upper cover 1
3 becomes strong against the downward load applied thereto, and the entry path from the outside to the inside of the electric connection boxes 1 and 2 becomes long, so that water does not easily enter.

[0034]

As described above in detail, according to the first and third aspects of the present invention, it is possible to prevent the electric junction box from being deformed and to prevent water from entering the inside thereof. It can be made strong against a load from above.

According to the second and fourth aspects of the present invention, it is possible to prevent water from splashing on the connection parts of the electrical components. According to the fifth aspect of the present invention, the fitting of the upper cover and the lower cover or the connection stand can be made stronger, and the water intrusion path can be lengthened to prevent the intrusion of the water.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a first embodiment.

FIG. 2 is a sectional view of a main part of the first embodiment.

FIG. 3 is a sectional view of a main part of a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric junction box, 11, 32 ... Lower cover, 13 ... Upper cover, 18 ... Connection part, 20 ... Electrical components, 22 ... Skirt part, 31 ... Connection stand.

Claims (5)

[Claims] 1. An electric connection box comprising: a lower cover having an open upper surface; a connection base disposed in the lower cover, to which electric components are connected; and an upper cover covering the upper surface of the lower cover and the connection base. The projection provided on the lower cover and the recess closed on the upper provided on the upper cover are made to correspond to each other in a fitting relationship of projections and depressions, and an inner lower end of the upper cover is arranged below each connection part of the electrical component. Electrical junction box. 2. The electrical connection box according to claim 1, wherein an upper end of the projection formed on the lower cover is located above a connection portion of the electrical component. 3. An electrical junction box comprising: a lower cover having an open upper surface; a connection table disposed in the lower cover, to which electrical components are connected; and an upper cover for covering the upper surface of the lower cover and the connection table. The protrusion provided on the connection stand and the recess closed on the upper provided on the upper cover are made to correspond to each other in a concave-convex fitting relationship, and the lower end inside the upper cover is arranged below each connection part of the electrical component. Electrical junction box. 4. The electrical connection box according to claim 3, wherein an upper end of the projection formed on the connection base is located above a connection portion of the electrical component. 5. The electric junction box according to claim 1, wherein an outer lower end of the upper cover is located at substantially the same height as an inner lower end.