JP4948940B2 - Waterproof cover structure of electrical junction box - Google Patents

Description

  The present invention relates to a waterproof cover structure for an electrical junction box which prevents water from entering from the joint between the covers against water from above.

  Generally, an electrical junction box includes electrical components such as a wiring board, a fuse, a relay, and a connector. For example, an electrical junction box mounted on an automobile may be installed in an engine room, and is moved to an engine room by car washing or the like. In order to prevent short circuit of electrical components such as a wiring board against the ingress of water, waterproofing measures are taken (for example, see Patent Document 1).

  As shown in FIGS. 4 and 5, the electrical junction box 101 disclosed in Patent Document 1 is provided with an inner wall 104 and an inclined wall 105 following the inner wall through a gap inside the wall portion 103 of one cover 102. The wall 107 of the other cover 106 is inserted into the gap along the inner wall 104 so that the tip 107a of the wall 107 of the other cover 106 is positioned above the inclined wall 105.

  When the two covers 102 and 106 are assembled, the wall portion 107 of the other cover 106 is inserted into the gap between the wall portion 103 and the inner wall 104 of one cover 102, and the tip of the wall portion 107 of the other cover 106 is located on the inner wall 104. And is located above the inclined wall 105. The inclined wall 105 is located below the tip of the wall portion 107 of the other cover 106. Then, the water flooded on the electrical junction box 101 passes between the wall portion 103 of the one cover 102 and the wall portion 107 of the other cover 106, and reaches the surface of the inclined wall 105 from the tip of the wall portion 107. It falls and is discharged to the outside along the inclined wall 105.

JP 2004-166362 A

  However, in the waterproof cover structure of the electrical junction box disclosed in Patent Document 1, the gap between the wall portion 103 of one cover 102 and the wall portion 107 of the other cover 106 is relatively narrow, and the interval is also constant. Therefore, water stays in the gap between the wall portion 103 of one cover 102 and the wall portion 107 of the other cover 106 due to capillarity or the like. There is a risk of returning to the inside.

  The present invention has been made in view of the above-described circumstances, and its purpose is to quickly discharge water droplets against water from above and reliably prevent water from entering the electrical junction box. The object is to provide a waterproof cover structure for an electrical junction box.

  The above object is achieved by the waterproof cover structure for an electrical junction box of the following (1) to (4) according to the present invention.

(1) In a waterproof cover structure for an electrical junction box comprising a rectangular cylindrical inner cover and an outer cover having a frame-shaped peripheral wall formed around a covering wall that closes an opening facing the horizontal direction of the inner cover ,
A downward slope wall connection have base end portion in a horizontal inner wall and the inner wall face each other with a parallel gap positioned inside the upper wall portion of the peripheral wall of the outer cover is connected to said cover wall in the outer cover Provided,
Inserting the upper wall portion of the inner cover into the gap along the inner wall, and projecting the tip of the upper wall portion of the inner cover to the outside in the insertion direction from the inner wall to be positioned above the inclined wall;
The inner wall of the outer cover is in contact with the inner surface of the upper wall portion of the inner cover,
A waterproof cover for an electrical junction box, characterized in that a concave groove extending from the distal end of the upper wall portion of the outer cover to the base end is provided on the inner surface of the upper wall portion of the outer cover that overlaps the outer surface of the upper wall portion of the inner cover. Construction.
(2) The waterproof cover structure for an electrical junction box according to (1), wherein the upper wall portion of the outer cover and the inclined wall are connected by a rib.
(3) The waterproof cover structure for an electrical junction box according to (1) or (2), wherein a locking projection is provided on the inner cover, and an engagement wall for the locking projection is provided on the outer cover.

With the configuration of (1) above, the upper wall portion of the inner cover is inserted into the gap between the upper wall portion and the inner wall of the outer cover peripheral wall when both covers are assembled, and the tip of the upper wall portion of the inner cover passes over the inner wall. Located above the inclined wall. Then, the water covered on the electric junction box falls between the upper wall portion of the outer cover and the upper wall portion of the inner cover, and falls from the tip of the upper wall portion of the inner cover onto the surface of the inclined wall. Are discharged to the outside. And, the inner surface of the upper wall portion of the outer cover that overlaps the outer surface of the upper wall portion of the inner cover is provided with a concave groove extending from the distal end of the upper wall portion of the outer cover to the base end, thereby widening the interval between the upper wall portions of both covers. Thus, it is possible to prevent water from remaining in the gap between the upper wall portions of both covers due to a capillary phenomenon or the like, and it is possible to reliably prevent water from entering the electrical junction box.

Further , when the two covers are assembled, the tip of the upper wall portion of the inner cover passes over the inner wall and is positioned above the inclined wall. The tip of the upper wall portion of the inner cover and the inner wall are horizontally spaced apart, the inner wall is located closer to the inner side of the electrical junction box, and the tip of the upper wall portion of the inner cover is located closer to the outer side of the electrical junction box. Then, the water covered on the electrical junction box surely falls on the surface of the inclined wall without returning from the tip of the upper wall portion of the inner cover to the inner wall, and is more smoothly discharged to the outside along the inclined wall. Is done.

With the above configuration (2), held in precise dimensions in ribs without a gap spreads largely between the upper wall and the inner wall of the outer cover, adhesion to the inner surface of the upper wall portion of the inner wall and the inner cover Rise. Thereby, waterproofness improves. Further, the mechanical strength structural gap around the outer cover is reinforced with ribs is up.

With the configuration ( 3 ) above, the locking projection and the engaging wall are engaged when the covers are assembled, and the covers are locked. The combination of the locking projection and the engaging wall does not use the penetrating engagement hole as the locking means, so that a problem that water enters the cover from the engagement hole is prevented.

  According to the present invention, it is possible to provide a waterproof cover structure for an electrical junction box that can quickly discharge water droplets from the top of the flooded water and reliably prevent water from entering the electrical junction box. it can.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of an embodiment of a waterproof cover structure for an electrical junction box according to the present invention, FIG. 2 is an enlarged perspective view showing an essential part of the waterproof cover structure for the electrical junction box in FIG. 1, and FIG. It is an expansion perspective view which shows the principal part of the waterproof cover structure of 1 electrical junction box in a cross section different from FIG.

  As shown in FIG. 1, an electrical junction box 1 includes a synthetic resin bottomed rectangular cylindrical inner cover 2 and a synthetic resin outer cover 3 that closes an opening 5 facing the horizontal direction of the inner cover 2. I have. In the inner cover 2, electrical components such as a wiring board, a fuse, a relay, and a connector (not shown) are accommodated. In the claims, the outer cover 3 is expressed as one cover, and the inner cover 2 is expressed as the other cover.

  A bracket 13 for attaching the electrical connection box 1 to a member (not shown) such as a vehicle panel (instrument panel) is provided at a corner of the inner cover 2 as a pair. Locking protrusions 14 are provided on the upper wall portion 9 a and the lower wall portion of the peripheral wall 9. Each locking projection 14 is for locking the outer cover 3.

  The outer cover 3 includes a rectangular plate-shaped cover wall 19 and a frame-shaped peripheral wall 20 formed around the cover wall 19. A slit-like opening 21 extending in the horizontal direction is provided at an upper edge portion of the cover wall 19 arranged vertically, and an inclined wall 17 extending obliquely upward from a lower edge of the opening 21 and a tip thereof. A horizontally extending inner wall 16 is integrally formed. The peripheral wall 20 covers the outer surface of the peripheral wall 9 of the inner cover 2.

  The inner wall 16 of the outer cover 3 is positioned parallel to the upper wall portion 20a of the peripheral wall 20 and is shorter than the upper wall portion 20a. The tip of the inner wall 16 is slightly inside the tip of the upper wall portion 20a. positioned. There is a gap between the inner wall 16 and the inclined wall 17 and the upper wall portion 20a.

  The base end portion of the inclined wall 17 connected to the covering wall 19 and the upper wall portion 20 are connected by a plurality of reinforcing ribs 24. The rib 24 is formed with a length that does not obstruct the insertion of the upper wall portion 9 a of the inner cover 2 into the gap between the inner wall 16 and the inclined wall 17 and the upper wall portion 20. The rib 24 is not always necessary.

  A lock portion 25 is formed to bulge outward on the upper wall portion 20a and the lower wall portion of the outer cover 3, and this lock portion 25 serves as an engagement wall for the locking projection 14 of the inner cover 2.

  The outer cover 3 is attached to the inner cover 2 in a state where electrical components and the like are accommodated in the inner cover 2. The peripheral wall 20 of the outer cover 3 covers the outer side of the peripheral wall 9 of the inner cover 2, and the lock portion 25 rides over the locking projection 14 and locks the locking projection 14 inside thereof.

  2 and 3, the inner surface of the upper wall portion 20a of the outer cover 3 is in contact with the outer surface of the upper wall portion 9a of the inner cover 2 (there may be a slight gap), and the inner wall 16 of the outer cover 3 is It is in contact with the inner surface of the upper wall portion 9a of the inner cover 2 (preferably in close contact). The inner surfaces of the lower wall and the left and right side walls of the outer cover 3 are in close contact with the outer surface of the peripheral wall 9 of the inner cover 2, or the tip of the peripheral wall 9 of the inner cover 2 is in close contact with the inner surface of the cover wall 19 of the outer cover 3. It is preferable to make it.

  The upper wall portion 20a of the outer cover 3 is in contact with the upper wall portion 9a of the inner cover 2 deeper than the inner wall 16, and the inner wall 16 is in contact with the upper wall portion 9a of the inner cover 2 within the depth of the upper wall portion 20a. Yes. The tip of the upper wall portion 9 a of the inner cover 2 passes through the proximal end of the inner wall 16 connected to the inclined wall 17 and protrudes outward, and is positioned above (in the upper side) of the intermediate portion of the inclined wall 17 following the inner wall 16. The base end of the upper wall portion 20a of the outer cover 3, that is, the cover wall 19, is located outside the tip of the upper wall portion 9a. That is, the tip of the upper wall portion 9 a of the inner cover 2 is located in the gap between the inner wall 16 and the inclined wall 17 and the upper wall portion 20.

  The water covered on the electrical junction box 1 falls from the tip of the upper wall portion 9a through a gap between the upper wall portion 9a of the inner cover 2 and the upper wall portion 20a of the outer cover 3, and the outer cover 3 is inclined. It is discharged outside along the outer surface of the wall 17.

  Here, on the inner surface of the upper wall portion 20a of the outer cover 3 that is in contact with the upper wall portion 9a of the inner cover 2 or opposed with a slight gap, the upper wall portion of the inner cover 2 extends from the tip of the upper wall portion 20a. A concave groove 26 reaching a position overlapping the tip of 9a is provided. In the illustrated example, the concave groove 26 is formed in a rectangular cross section, but may be a triangular cross section, a semicircular cross section, or the like.

  The groove 26 widens the space between the upper wall portion 9a of the inner cover 2 and the upper wall portion 20a of the outer cover 3, and water remains in the gap between the upper wall portions 9a and 20a of the covers 2, 3 due to capillary action or the like. The water on the upper wall portion 9a of the inner cover 2 is quickly discharged.

  As described above, according to the waterproof cover structure of the electrical junction box 1 of the present embodiment, the upper cover 20 is placed in the gap between the upper wall portion 20a of the outer cover 3 and the inner wall 16 when the covers 2 and 3 are assembled. The wall 9 a is inserted, and the tip of the upper wall 9 a of the inner cover 2 passes over the inner wall 16 and is located above the inclined wall 17. The inclined wall 17 is located below the tip of the upper wall portion 9a of the inner cover 2. Then, the water flooded on the electrical junction box 1 passes between the upper wall portion 20a of the outer cover 3 and the upper wall portion 9a of the inner cover 2 and then the inclined wall 17 from the tip of the upper wall portion 9a of the inner cover 2. Fall on the surface of the water and discharged to the outside along the inclined wall 17. A concave groove 26 is provided on the inner surface of the upper wall portion 20a of the outer cover 3 so as to reach a position overlapping the tip of the upper wall portion 9a of the inner cover 2 from the tip of the upper wall portion 20a. By widening the space between 9a and 20a, it is possible to prevent water from staying in the gap between the upper wall portions 9a and 20a of the covers 2 and 3 due to capillarity or the like, and to ensure the ingress of water into the electrical junction box 1 Can be prevented.

  Moreover, according to the waterproof cover structure of the electrical junction box 1 of the present embodiment, the tip of the upper wall portion 9a of the inner cover 2 passes over the inner wall 16 of the outer cover 3 when the covers 2 and 3 are assembled, and the inclined wall 17 and located above 17. The tip of the upper wall portion 9a of the inner cover 2 and the inner wall 16 of the outer cover 3 are horizontally spaced, the inner wall 16 is located closer to the inner side of the electrical junction box 1, and the tip of the upper wall portion 9a of the inner cover 2 is electrically Located near the outside of the junction box 1. Then, the water covered on the electric junction box 1 surely falls on the surface of the inclined wall 17 without returning to the inner wall 16 from the tip of the upper wall portion 9 a of the inner cover 2, and along the inclined wall 17. More smoothly discharged to the outside.

  Further, according to the waterproof cover structure of the electrical junction box 1 of the present embodiment, the rib 24 that connects the lower end side of the inclined wall 17 and the upper wall portion 20 is provided between the upper wall portion 20a and the inner wall 16 of the outer cover 3. The gap between the inner wall 16 and the upper wall portion 9a of the inner cover 2 is enhanced. Thereby, waterproofness improves. Further, the mechanical strength of the outer cover 3 is also increased.

  Further, according to the waterproof cover structure of the electrical junction box 1 of the present embodiment, the locking projections 14 are engaged with the lock portions 25 simultaneously with the assembly of the covers 2 and 3, and the covers 2 and 3 are firmly attached. Locked. The combination of the locking protrusion 14 and the lock portion 25 does not use the penetrating engagement hole as the locking means, so that a problem that water enters the cover from the engagement hole is prevented.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

It is a disassembled perspective view of one Embodiment of the waterproof cover structure of the electrical junction box of this invention. It is an expansion perspective view which shows the principal part of the waterproof cover structure of the electrical junction box of FIG. It is an expansion perspective view which shows the principal part of the waterproof cover structure of the electrical junction box of FIG. 1 in a cross section different from FIG. It is a disassembled perspective view of the waterproof cover structure of the conventional electrical junction box. It is sectional drawing of the waterproof cover structure of the electrical junction box of FIG.

Explanation of symbols

1 Electrical junction box 2 Inner cover (the other cover)
3 Outer cover (one cover)
9 Inner cover peripheral wall 9a Upper wall (the wall of the other cover)
14 Locking projection 16 Inner wall 17 Inclined wall 20 Outer cover peripheral wall 20a Upper wall portion (wall portion of one cover)
24 rib 25 lock part (engagement wall)
26 Groove

Claims (3)

In a waterproof cover structure of an electrical junction box comprising a rectangular cylindrical inner cover and an outer cover having a frame-shaped peripheral wall formed around a covering wall that closes an opening facing the horizontal direction of the inner cover,
A downward slope wall connection have base end portion in a horizontal inner wall and the inner wall face each other with a parallel gap positioned inside the upper wall portion of the peripheral wall of the outer cover is connected to said cover wall in the outer cover Provided,
Inserting the upper wall portion of the inner cover into the gap along the inner wall, and projecting the tip of the upper wall portion of the inner cover to the outside in the insertion direction from the inner wall to be positioned above the inclined wall;
The inner wall of the outer cover is in contact with the inner surface of the upper wall portion of the inner cover,
A waterproof cover for an electrical junction box, characterized in that a concave groove extending from the distal end of the upper wall portion of the outer cover to the base end is provided on the inner surface of the upper wall portion of the outer cover that overlaps the outer surface of the upper wall portion of the inner cover. Construction.   The waterproof cover structure for an electrical junction box according to claim 1, wherein the upper wall portion of the outer cover and the inclined wall are connected by a rib.   The waterproof cover structure for an electrical junction box according to claim 1 or 2, wherein a locking projection is provided on the inner cover, and an engagement wall for the locking projection is provided on the outer cover.

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