CN1551436B - Waterproofing structure for electric junction box - Google Patents

Abstract

An electric junction box. The first box body has a plurality of first side walls extending in a first direction that should enclose the inner space. The second-layer wall is provided on at least the side walls arranged on the upper side of the plurality of first side walls of the first box. By providing the first wall part and the second wall part, the side walls arranged on the at least upper side A groove is formed between the side wall and the second wall portion; the first wall portion extends from the side wall configured at least on the upper side in a second direction substantially perpendicular to the first direction, and the second wall A portion extends continuously in the first direction from the first wall portion. The second box has a plurality of second side walls extending in the first direction, and the interior is sealed by fitting the plurality of second side walls on the outer sides of the plurality of first side walls. space. A rib is continuously provided in the second side wall extending in the second direction from the front end of the side wall fitted into the groove.

Description

Waterproof structure of electrical junction box

technical field

The invention relates to a waterproof structure of an electric junction box.

Background technique

Generally, electrical junction boxes used for electric circuits of automobiles are often placed in the engine compartment, but they may also be placed in the vehicle. At this time, although the situation of directly spraying water is rare, when the current popular wet cleaning (washing) in the car, or when drinking or splashing the condensed water flowing from the air-conditioning duct when eating in the car, it is necessary It will be required to prevent water from entering the car.

The use of O-rings is considered for good waterproof performance, but this requires grooves corresponding to the O-rings to be formed on the body and cover parts. Thus, problems such as an increase in mold cost, an increase in the number of parts due to the use of the O-ring, and an increase in assembly man-hours are incurred.

In view of the above-mentioned problems, published on Japanese Utility Model Application Publication No. 55-129479, as shown in FIG. Watertight waterproof structure 103 (referring to first page, first figure) between.

That is, as shown in FIG. 7 , on the peripheral wall 101 a of the main body 101, an L-shaped frame body 104 is provided in cross section, and an annular groove 105 is formed between the frame body 104 and the peripheral wall 101 a of the main body 101, and at the same time, the cover member 102 is surrounded. A cover body 106 covering the frame body 104 is set around the frame body. Moreover, an appropriate space is formed between the frame body 104 and the upright root of the cover body 106 , and an inclined plate 107 whose front end is close to the peripheral wall 101 a of the main body 101 is provided on the edge end of the cover body 106 .

However, even in the above-mentioned electric junction box, due to deformation due to aging and the like after the formation of the main body 101 and the cover member 102, a gap will be generated between the main body 101 and the cover member 102, and water leakage may occur.

Here, Japanese Patent Application Laid-Open Publication No. 11-41748 discloses a waterproof structure as shown in FIG. 8 that should solve the above-mentioned problems (see pages 2 and 3, first figure).

That is, the electrical junction box 110 is constituted by an upper cover 111 and a lower cover 112, and a skirt 113 is formed on the outer peripheral lower portion of the upper cover 111, thereby forming a fitting groove 114 closing the upper portion. The upper cover 111 is placed on the lower cover 112 so that the peripheral wall 112 a at the upper end of the lower cover 112 is fitted into the fitting groove 114 . In this way, a three-layer wall is formed by the skirt portion 113 and the lower cover 112 to achieve waterproofing.

But, in described electrical connection box 110, finish the positioning and waterproofing to the lower cover 112 as main body and the upper cover 111 as cover parts simultaneously, thereby, when the lower cover 112 and upper cover 111 are deformed due to aging, as The upper peripheral wall 112a of the lower cover 112 shown in FIG. 18 is stuck on the step 113a in the middle of the skirt 113 of the upper cover 111, making mutual fitting very difficult.

Contents of the invention

An object of the present invention is to provide a waterproof structure of an electrical junction box capable of improving waterproofness with a simple structure.

To achieve the above object, the present invention provides an electrical junction box, which has: a main body, which has a main body wall extending along a first direction to enclose an internal space; a second layer of wall, which is arranged on the Among the plurality of body wall parts, at least the body wall part arranged on the upper side in the use state has an inner wall and an outer wall and a groove is formed between the outer wall and the inner wall; Among the body walls, at least a part of the body wall disposed on the upper side in the use state, the inner wall is continuous from the outer wall and extends along the first direction; a plurality of extended fitting edges for blocking the inner space by fitting the plurality of fitting edges on the outer side of the inner wall; ribs embedded in the plurality of fitting edges from the plurality of fitting edges The front end of the fitting edge in the groove is continuous and extends along a second direction perpendicular to the first direction, and the length dimension of the rib is larger than the size of the water droplet formed in the groove; the first direction is the fitting direction of the body and the cover member.

In the electrical junction box constructed in this way, water dripping from the second wall portion provided on the upper side of the electrical junction box in the use state flows through the outside of the second box body, so that water can be prevented from entering the electrical junction box.

In addition, the ribs can also prevent water from entering when water flows through the second box to the side of the first box and enters the second-layer wall, so water can be prevented from entering the inside of the electrical junction box. Also, it is possible to prevent water from infiltrating into the inner space by capillary phenomenon

The front ends of the ribs preferably contact the inner surface of the first outer wall.

In this way, the intrusion of water can be more reliably prevented by the ribs.

Said outer wall preferably has a length at least covering said rib.

In this way, since the rib is covered with the second-layer wall, it is possible to prevent water from entering over the rib.

Preferably, an engaging member for engaging at least one of the plurality of fitting end edges fitted in the groove into the groove is provided on the inner wall provided with the second wall portion.

In this way, since the engaging means is provided on the inner wall of the second-layer wall part, water can be prevented from infiltrating from the part where the engaging member is provided.

The length of the rib is preferably more than 1.5mm

FIG. 1 is an exploded perspective view showing a waterproof structure of an electrical junction box according to an embodiment of the present invention;

Description of drawings

Fig. 2 is the cross-sectional view of the outer two-story wall portion at the II-II position of Fig. 1;

Fig. 3 is the enlarged sectional view of part III in Fig. 2;

Fig. 4 is a sectional view showing the flow of water dripping from above in the electric junction box of the present invention;

5 is a schematic top view showing the flow of water dripping from the electrical junction box of the present invention;

Fig. 6 is a perspective view showing an example of a conventional electrical junction box;

Fig. 7 is the sectional view of XV II-XV II position of Fig. 6;

Fig. 8 is a perspective view showing another example of a conventional electrical junction box;

FIG. 9 is a cross-sectional view illustrating a problem of the electrical junction box of FIG. 8 .

Hereinafter, an embodiment of the waterproof structure of an electrical junction box according to the present invention will be described in detail with reference to the drawings.

Detailed ways

As shown in FIG. 1 , an electrical junction box 10 according to an embodiment of the present invention has a main body 20 with openings 21f and 21r on the front and rear sides, and a body 20 that covers and fits the outer sides of the front and rear openings 21f and 21r. A pair of cover members 30f, 30r. The main body 20, the cover members 30f, 30r, etc. are generally made of synthetic resin. This electrical junction box 10 is used, for example, in a state where both openings 21f and 21r of the main body 20 are substantially along a vertical plane.

The inside of the main body 20 is provided with a receiving and discharging device mounting part seat 22 for installing various electrical mounting parts, on the outer periphery of the main body 20, on the front and rear sides of the fitting direction (arrow direction in FIG. 1 ) of the cover parts 30f and 30r. A body wall portion 23 is provided. In the main body wall 23, at least the upper main body wall 23U in the use state of the electrical junction box 10 is provided with an outer wall 24a and an inner wall 24b constituting an outer inner two-layer wall in front and rear directions.

In addition, it is also possible to provide the outer wall 24a and the inner wall 24b around the entire circumference.

As shown in FIG. 2, the outer two-layer wall part composed of the outer wall 24a and the inner wall 24b provided on the main body 20 provides a predetermined gap 25 between the outer wall 24a and the inner wall 24b, and the lid members are respectively fitted in the gap 25. 30f, 30r is a structure including cover members 30f, 30r between the outer wall 24a and the inner wall 24b.

In addition, in the cover members 30f, 30r, inside the walls 32r and 32f (the lower side in FIG. 2 ), a support rib 37 for engaging the front end of the inner wall 24b of the body wall 23 protrudes inwardly. Thereby, the inner wall 24b is held, and the main body 20 and both cover members 30f and 30r can be reliably integrated.

In addition, on the inner side in the width direction of the outer surface outer wall 24a of the inner wall 24b that is the inner side of the outer two-layer wall portion, a locking protrusion 26 is provided to maintain the fitting state of the cover members 30f, 30r, and hold the cover members 30f, 30r. prevent shedding.

As shown in FIG. 1, the cover member 30r on the back side is to cover the opening 21r on the back side of the main body 20, and has a substantially rectangular substrate 31r. 31r is provided with a wall 32r. As shown in FIG. 2 , a rib 32 a is protruded toward the outer wall 24 a of the main body wall portion 23 at the front end of the wall 32 r serving as the fitting edge.

As shown in Fig. 3, the height of the rib 32a is ideal that its front end 32b just touches the inner surface 24d of the outer wall 24a, and at least the protruding dimension H of the rib 32a is above the diameter of the water drop, specifically above 1.5mm. Prevents water from penetrating due to capillary action.

Furthermore, the side surface 32c of the rib 32a is preferably in contact with the central side surface 32e of the body wall portion 23 . This prevents water from flowing toward the inside of the main body wall portion 23 and improves waterproofness. In addition, it is desirable that the length of the outer wall 24a is at least such that the front end surface 24c completely covers the rib 32a inside.

As shown in Figure 1, the wall 32r of the cover part 30r is provided with notches 33a, 33b according to different positions, so as to avoid interference with the installation bracket 34 provided on the electrical installation seat 22 of the main body 20, or to form an installation cover to be installed on the electrical installation. The connector cover of the connector on the component seat 22.

The rib 32a provided at the front end of the wall 32r is provided continuously along the notches 33a, 33b, etc. over the entire circumference in accordance with the shape of the wall 32r. Thus, water adhering to the outer surface of the cover member 30r is reliably prevented from penetrating into the inner side of the cover member 30r by the rib 32a.

In addition, the ribs 32a provided along the cutouts 33a, 33b, etc. are provided obliquely in the direction in which the cutouts 33a, 33b become narrower from the side of the main body 20 to the outside. That is, the rib 32a must be folded into an obtuse angle (θ in FIG. 1 ), so that the water flow along the rib 32a is smooth and water can be prevented from accumulating. In this way, waterproofness can be improved.

In addition, as shown in FIG. 1 , the front side cover member 30 f covers the front side opening 21 f of the main body 20 and is formed in the same shape as the rear side cover member 30 r described above. That is, on the outer periphery of the substrate 31f, a wall 32f is extended in the fitting direction, and the front end of the wall 32f is provided with the same rib 32a as the rib 32a provided on the rear side cover member 30r. In addition, on the cover member 30f, in order to avoid mutual interference with the electrical installation installed on the receiving and discharging device installation seat 22, a concave portion 35 or notches 36a, 36b are provided corresponding to the shape of the electrical installation.

In FIG. 4, the flow path of the water dripped from the upper side of the electrical junction box 10 is shown. The water dripped on the upper body wall 23U from above flows along the upper surface of the outer wall 24a to the front and rear (left and right in FIG. 4 ) both sides (arrow A in FIG. 4 ), and falls on the walls 32f and 32r of the cover members 30f and 30r. (arrow B). Once part of the water falling on the walls 32f, 32r flows inward (arrow C), it will be blocked by the ribs 32a provided on the walls 32f, 32r, flow to the outside of the cover members 30f, 30r, and then fall (arrow D).

In addition, as shown in FIG. 5, although a part of the water flowing inward indicated by the arrow C in FIG. 4 flows to the left and right along the rib 32a (arrow E in FIG. 5), since the rib 32a is continuously formed over the entire circumference , so it will not flow beyond the rib 32a to the inner wall 24b of the body wall portion 23 .

For example, even in the portion of the notch 33a provided in the cover member 30r on the rear side, since the rib 32a is continuously formed along the notch 33a, water flows down along the rib 32a (arrow F).

According to the above-mentioned waterproof structure of the electrical junction box, in the state of use, an outer two-layer wall portion composed of the outer wall 24a and the inner wall 24b is provided on the upper body 20, and the cover member 30f is fitted between the outer wall 24a and the inner wall 24b. , 30r, at the same time, since the front end of the wall 32f, 32r provided on the cover member 30f, 30r is erected with a rib 32a, the waterproof performance between the body 20 and the cover member 30f, 30r can be improved.

In addition, the waterproof structure of the electric junction box of this invention is not limited to the said embodiment, It can deform|transform and improve suitably.

For example, in the aforementioned embodiment, as shown in FIG. 1 , openings 21f, 21r are provided on the front and rear surfaces of the main body 20, and both openings 21f, 21r are covered by a pair of cover members 30f, 30r. In addition, the same applies to the configuration in which the opening 21 is provided only on the front (or rear) side of the main body 20 and the opening 21 is covered by one cover member 30 . At this time, an outer wall 24a and an inner wall 24b are extended on the front side of the main body 20 to form an outer inner double wall portion, and the end edge of the wall 32 of the cover member 30 is fitted into the gap 25 between the outer wall 24a and the inner wall 24b. .

Claims (5)

1. connection box, it has:

Body, this body have and surround the inner space and along body wall portion that first direction extends;

Two layers of wall portion, it is arranged on the body wall portion that is configured in upside in a plurality of body wall portion of described body at least under user mode, has inner and outer wall and be formed with groove between described outer wall and described inwall; Described outer wall is for being configured in the part of the body wall portion of upside at least under user mode in a plurality of body wall portion of described body, described inwall extends continuously and along described first direction from described outer wall;

Cover, this cover have a plurality of chimeric end limit of extending along described first direction, are entrenched in the outside of described inwall and inaccessible described inner space by making described a plurality of chimeric ends limit;

Rib, its leading section that is embedded in the chimeric end limit in the described groove from described a plurality of chimeric ends limit extends continuously and along the second direction perpendicular to described first direction, and the length dimension of described rib is bigger than the water droplet size that forms in described groove;

Described first direction is the chimeric direction of described body and described cover.

2. connection box as claimed in claim 1 is characterized in that, the inner face of the described outer wall of preceding end in contact of described rib.

3. connection box as claimed in claim 1 is characterized in that described outer wall has the length that covers described rib at least.

4. connection box as claimed in claim 1 is characterized in that, the engaging part that at least one the chimeric end checkpost in the described a plurality of chimeric ends limit that is embedded in the described groove is combined in this groove is arranged on the inwall of described two layers of wall portion.

5. connection box as claimed in claim 1 is characterized in that, the length dimension of described rib is more than the 1.5mm.

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