JP5242326B2 - Waterproof structure of electrical junction box - Google Patents

Description

  The present invention relates to a waterproof structure for an electrical junction box that isolates water that has entered from the side opening of the electrical junction box so as not to enter the electrical component portion.

  FIG. 7 shows one form of the waterproof structure of the conventional electrical junction box.

  This waterproof structure is provided with upper and lower openings 55 and 56 through which two upper and lower wire harnesses (a plurality of electric wires) 53 and 54 are inserted into a synthetic resin frame 52 of the electrical junction box 51, and the upper sub-wire harness 53. Is covered with a pair of upper and lower split-type synthetic resin side covers 57 and 58 in the upper opening 55 for waterproofing.

  The sub-wire harness 53 is a lead-out wire for a connector or the like (not shown) disposed on the upper portion of the frame 52. The side covers 57 and 58 are attached to the rectangular openings 55 in a sliding manner from above. The lower opening 56 communicates with the lower cover (not shown) of the electrical junction box, and the lower main wire harness 54 is provided in the lower cover as a lead wire for relays, fuses, etc. (not shown) in the frame 52. Routed. An upper cover (not shown) is attached to the upper opening of the frame 52. The electrical junction box 51 is disposed in the engine room of the automobile.

  As a waterproof structure (not shown) of the electrical junction box similar to FIG. 7, for example, in Patent Document 1, the lower semi-annular portion is integrated with a vertically long opening for harness lead of a synthetic resin junction box body. It is described that the semi-annular portion of the side cover is joined to the upper side of the semi-annular portion, and Patent Document 2 describes that the lower semi-annular portion is formed in the vertically long opening for harness extraction of the synthetic resin junction box body. It is described that it is provided integrally, the lower half-annular portion of the block is joined to the upper side of the half-annular portion, and the semi-annular portion of the second block is joined to the upper side of the upper half-annular portion of the block.

  FIG. 8 shows another form of a waterproof structure of a conventional electrical junction box (see Patent Document 3).

  In this waterproof structure, a waterproof wall 63 is raised and formed on the bottom wall of the lower case 62 of the electrical junction box 61, the interior of the lower case 62 is partitioned by the waterproof wall 63, and left and right storage chambers 64 and 59 are provided, and the left storage chamber The electronic control unit 65 is arranged at 64, a wire harness 66 is connected to the lower part of the electronic control unit 65 with a connector 67, and the wire harness 68 in the middle of the electronic control unit 65 in the height direction passes through the upper end of the waterproof wall 63 to the right side. The relay block 70 is led out to the outside from the opening 72 at the bottom of the storage chamber 69, the relay block 70 is arranged at the top of the right storage chamber 69, and the wire harness 71 of the relay block 70 is led out from the opening 72.

An upper case 73 is attached to the lower case 62. Even if water enters the lower case from the opening 72 at the bottom of the lower case 62, the waterproof wall 63 prevents water from entering the connector portion 67 of the electronic control unit 65. Reference numeral 74 denotes a drain hole at the bottom.
Japanese Patent Laying-Open No. 2006-121878 (FIG. 3) Japanese Patent Laying-Open No. 2007-14054 (FIG. 1) Japanese Patent Laid-Open No. 2000-349452 (FIG. 1)

  However, the conventional waterproof structure shown in FIG. 7 requires a pair of upper and lower side covers 57 and 58 for waterproofing, which increases the cost and increases the amount of assembly of the two side covers 57 and 58. There was a problem of requiring a lot of man-hours. Further, in the waterproof structure of FIG. 8, for example, when water droplets fall from the relay block 70 and adhere to the upper surface of the wire harness 68 in the right storage chamber 69, the water droplets are waterproof due to the inclination of the vehicle or the like. There is a concern that the electronic control unit 65 may be penetrated beyond the wall 63.

  In view of the above points, the present invention can reduce the cost and assembly man-hours associated with the use of the upper and lower side covers, and that water infiltrates the main part in the electrical junction box along the wire harness. An object of the present invention is to provide a waterproof structure for an electrical junction box that can be reliably prevented.

In order to achieve the above object, a waterproof structure for an electrical junction box according to claim 1 of the present invention comprises a side opening of a junction box body, a plate portion perpendicular to an obliquely upward protector portion, and a notch hole for inserting a harness. And a water intrusion permitting space is provided inside the junction box body in communication with the cutout hole, and the wire harness extends from the protector portion along the plate portion into the water intrusion permitting space. And a waterproof wall that projects obliquely downward in the water permissible space along the outer surface of the bent portion of the wire harness .

  With the above configuration, the wire harness is introduced from the cutout hole (side opening) into the inside of the junction box body (within the water permeation allowable space) along the inner surface of the protector portion and the inner surface of the plate portion, and below the protector portion. The notch hole is exposed and water enters the junction box body through the gap between the notch hole and the outer peripheral surface of the wire harness, but the water that has entered the water permissible space along the wire harness It cannot rise along the vertical rising part of the bent part of the wire harness along the line, and falls by its own weight and is discharged to the outside from the bottom part of the electric junction box.

In addition , when water spouts into the junction box body from the gap between the cutout hole of the side cover and the outer peripheral surface of the wire harness, the water hits the slanted bottom surface of the waterproof wall and splashes downward to enter the water. It falls to the lower side of the allowable space and is discharged to the outside. The water adhering to the inclined upper surface of the waterproof wall quickly falls along the inclined upper surface. If the tip of the waterproof wall is brought into contact (contact) with the outer peripheral surface of the wire harness, the water rising along the outer surface of the wire harness can be rebounded by the waterproof wall.

The waterproof structure of the electrical junction box according to claim 2 is the waterproof structure of the electrical junction box according to claim 1 , wherein the waterproof wall is provided with an arc-shaped recess along the outer peripheral surface of the wire harness. And

  By the said structure, the clearance gap between the outer peripheral surface of a wire harness and the front-end | tip of a waterproof wall is prescribed | regulated as small as possible. If the outer peripheral surface of the wire harness is brought into contact with the recess, the gap can be completely eliminated.

The waterproof structure of the electrical junction box according to claim 3 is the waterproof structure of the electrical junction box according to claim 1 or 2 , wherein the waterproof junction structure is provided on a lower side of the waterproof wall in the water intrusion allowable space, on a side portion of the waterproof wall. The following sub-waterproof wall is provided vertically.

  With the above configuration, water that has entered from the cutout hole of the side cover is received by the secondary waterproof wall and falls, and water that falls from the waterproof wall (main waterproof wall) is guided along the secondary waterproof wall smoothly and reliably. Fall.

The waterproof structure of the electrical junction box according to claim 4 is the waterproof structure of the electrical junction box according to any one of claims 1 to 3 , wherein a band mounting portion is provided on the plate portion, The bent portion of the wire harness is bound by a band.

  With the above configuration, the wire harness is bound and fixed to the band attachment part, and the water that is going to rise along the rising part of the bent part of the wire harness hits the band and falls, so that water enters above the band. (Progress) is blocked.

The waterproof structure of the electrical junction box according to claim 5 is the waterproof structure of the electrical junction box according to claim 4 , characterized in that a harness guide wall is provided on the plate portion above the band mounting portion.

  With the above configuration, the rising portion of the wire harness is stably supported by the harness guide wall, and the rising direction of the wire harness is accurately defined. Moreover, since the outer peripheral surface of the wire harness is in close contact with the harness guide wall, the water is prevented from rising along the rising portion of the wire harness similarly to the band.

  According to the first aspect of the present invention, an arrangement portion (such as an electrical component other than the water intrusion allowance space) is provided by naturally dropping water into the water intrusion allowance space of the junction box body along the rising portion of the wire harness. It is possible to prevent water from entering the main part. In addition, it is safe to enter water from the side cover into the water entry permissible space of the junction box body, so the side cover can be simplified and reduced in cost, and the number of steps for assembling the side cover can be reduced. .

In addition , the water sprayed obliquely upward from the cutout hole of the side cover is received by the downwardly inclined waterproof wall and surely dropped, so that the momentum to the main part of the electrical junction box due to splashing while driving the vehicle etc. Good water can be reliably prevented from entering.

According to invention of Claim 2 , the water stop by a waterproof wall can be improved by making the clearance gap between the outer peripheral surface of a wire harness and a waterproof wall small.

According to the third aspect of the present invention, the water falling from the waterproof wall can be smoothly and reliably discharged by guiding the water in the drop direction by the auxiliary waterproof wall.

According to the fourth aspect of the present invention, water entering the bent portion of the wire harness is received by the band and dropped, thereby reliably preventing water from entering the main part of the electrical junction box. Can do.

According to the invention described in claim 5 , it is possible to accurately define the direction of introduction of the wire harness upward with the harness guide wall and reliably drop water from the rising portion of the wire harness to the lower part of the water intrusion allowable space. it can.

  1 to 6 show an embodiment of a waterproof structure for an electrical junction box according to the present invention.

As shown in FIGS. 1 to 3, this waterproof structure has a synthetic resin having a protector portion 5 that is obliquely upward in a side opening 3 for leading out a harness of a synthetic resin frame (junction box body) 2 of an electrical connection box 1. The side cover 4 made of metal is attached only on the upper side, and the wire harness 7 is bent upward in a substantially U shape into the water intrusion-allowing empty space 8 following the side opening 3 of the frame 2 along the side cover 4. Furthermore, an obliquely downward waterproof wall 10 is protruded from the inner wall 9 of the water intrusion-allowable space 8 so as to face the side opening 3, and the tip 10 a of the waterproof wall 10 is brought close to the outer peripheral surface of the wire harness 7. Is.

  The water intrusion vacant chamber 8 is surrounded by four vertical wall portions 9 and 11 to 13 including the side openings 3 and has a rectangular cross section, and as shown in FIGS. The bottom part opens in a rectangular shape (the bottom part opening is indicated by reference numeral 14) and penetrates to the lower end of the frame 2. As shown in FIG. 1, a lower cover 15 made of synthetic resin is attached to the lower end of the frame 2, and a drain hole (not shown) is provided at the bottom of the lower cover 15. As shown by the arrow in FIG. 4, the water that has entered the permissible water vacant space 8 is discharged to the outside from the bottom opening 14 of the permissible water vacant space 8 through the drain hole of the lower cover 15.

  As shown in FIGS. 1 and 2, the side opening 3 is provided on one side wall (outer wall) 11 of the frame 2, and another side wall (outer wall) 12 orthogonal to the one side wall 11 and one inner wall 9 orthogonal to the other side wall 12. The three inner wall portions (peripheral walls) 9, 12, 13 of the water intrusion-accepting vacant space are configured in a substantially U shape in plan view with the other inner wall 13 parallel to the other side wall 12 and perpendicular to the one side wall 11. . Each inner wall 9, 13 has the same height as the upper end of the frame 2. The side opening 3 is cut out in a substantially vertically long rectangular shape downward from the upper end of the one side wall 11.

  As shown in FIG. 4, another large side opening 16 having a substantially rectangular shape is cut out to the lower end of the frame 2 below the side opening 3, and a main wire harness (not shown) is formed in the other side opening 16. The auxiliary wire harness 7 is inserted into the upper side opening 3. The connection of each wire harness 7 in or outside the electrical junction box 1 is the same as in FIG.

  As shown in FIGS. 1 and 2, each connector 17, fuse mounting part (fuse block) 18 and relay mounting part (relay block) 19 are inserted into the frame 2 from below on the outside of the inner walls 9 and 13 of the water intrusion-allowable vacant space 8. Worn. The upper sub-wire harness 7 is composed of an upward electric wire led out from the connector 17 and the like, and the lower main wire harness (not shown) is composed of a downward electric wire connected to the fuse 18a, the relay 19a and the like. Is done. The upward wire harness portion 7a in the water intrusion-allowable space 8 is isolated from the electric and electronic parts such as the relay 19a, the fuse 18a, the connector 17 and the like by the inner walls 9 and 13 of the water-intrusion-allowable space 8.

  As shown in FIGS. 1 to 4, a flat waterproof wall 10 protrudes obliquely downward on the inner surface of one inner wall 9 that faces the side opening 3 of the water intrusion-allowable space 8. The waterproof wall 10 has an inclined lower surface 10b, and acts to receive water (particularly water spouted up) from the side opening 3 and drop it downward. The inclined upper surface 10c of the waterproof wall 10 acts to quickly drop water droplets attached to the upper surface 10c.

  1 and 2, the right and left ends (side ends) of the waterproof wall 10 continue to intersect the other outer wall 12 and the other inner wall 13 side, and the waterproof wall 10 connects the other outer wall 12 and the other inner wall 13 side. Yes. As shown in FIG. 4, the base end (rear end) 10 d of the waterproof wall 10 is located at substantially the same height as the upper end of the cutout hole 20 of the side cover 4 and intersects the inner wall 9. The front end 10a is positioned at a substantially central height of the hole 20.

  As shown in FIG. 2, one side portion (left end portion) 10e of the waterproof wall 10 continues to cross the other outer wall 12, and the one side portion 10e is extended in a slanted plate-like shape toward the front and inclined downward (the extension portion is denoted by reference numerals). As shown in FIG. 4, the front end of the extension 10 e ′ is positioned substantially at the center height of the notch hole 20, and the vertical portion 10 f extending downward from the front end of the extension 10 e ′ is allowed to enter water. The rear surface of the vertical waterproofing wall 21 is integrally formed with the upper end of the vertical vertical waterproofing wall 21 on the lower side of the vacant space 8, and the rear surface of the vertical portion 10 f is continuous with the rear surface 21 a of the auxiliary waterproofing wall 21.

  The sub-waterproof wall 21 blocks water that has entered from the gap between the notch hole 20 and the outer peripheral surface of the wire harness 7 from the front half side of the water intrusion-allowable space 8 and drops it. It acts on the wall to guide the discharge smoothly downward.

  As shown in FIG. 2 and FIG. 4 to FIG. 5, the sub waterproof wall 21 has a forward-facing flange portion 21 b at the upper end, and at a substantially intermediate position between the parallel outer wall 11 and the inner wall 9 of the water intrusion-allowable space 8. It is formed vertically from the other outer wall 12 to the other inner wall 13. One side of the auxiliary waterproof wall 21 is orthogonal to the other outer wall 12, the other side of the auxiliary waterproof wall 21 is orthogonal to the other inner wall 13, and the auxiliary waterproof wall 21 connects the other outer wall 12 and the other inner wall 13.

  As shown in FIG. 4, the upper end of the sub-waterproof wall 21 is located slightly below the lower end of the side opening 3, and there is a slight gap from the lower end surface of the bent portion 7 b of the wire harness 7 as shown in FIG. 6. As shown in FIG. 4, the lower end of the sub-waterproof wall 21 is positioned slightly below the lower portion of the water intrusion-allowing empty space 8, that is, the lower end of the inner wall 13.

  As shown in FIG. 4, the lower end 3 a of the side opening 3 continues to the outer wall 11 and is curved in an arc shape along the outer peripheral surface of the wire harness 7, and the lower end 3 a of the side opening 3 and the cutout hole 20 of the side cover 4. And a substantially circular harness insertion hole. On the lower side of the side opening 3, the inclined upper wall 22 of the lower side opening 16 continues to the outer wall 11 so as to intersect the rear side, and the rear end of the upper wall 22 is lower than the lower end of the sub waterproof wall 21. Is also located slightly below.

  As shown in FIG. 2, at the front end of the main portion excluding the one side portion 10e of the waterproof wall 10, the rear portion of the U-shaped bent portion 7b of the wire harness 7 shown in FIGS. An arcuate concave portion 10a having a shape along the outer peripheral surface is cut out. As shown in FIG. 5, the arc-shaped recess 10 a is located close to the rear outer peripheral surface of the wire harness 7. The concave portion 10 a may be in light contact with the rear outer peripheral surface of the wire harness 7.

  As shown in FIGS. 1 and 2, in this example, the other side portion (right end portion) 10g of the waterproof wall 10 is located above the double wall 13a along the inner side of the other inner wall 13 along the other side. A narrow extension plate portion (not shown) hanging from the portion 10g is integrally connected to the upper end of the double wall 13a, and the inner surface of the extension plate portion is continuous with the inner surface of the double wall 13a. The right end of the sub-waterproof wall 21 also continues integrally perpendicularly to the double wall 13a. In this example, the double wall 13a is used to provide a locking arm (locking means) for the fuse block (FIG. 2) between the double wall 13a and the other inner wall 13, but the locking arm is unnecessary. In this case, it is possible to exclude the double wall 13a and make only the other inner wall 13. The double wall can be seen as a part of the other inner wall 13.

  As shown in FIGS. 1 to 3, at the front edge of the side opening 3 of the case 2, a pair of left and right vertical rail portions 23 are provided on the outer surface of the one outer wall 11, and at the rear edge of the side opening 3, A pair of left and right vertical rail portions 24 are provided on the inner surface so as to be narrower than the front rail portion 23. Locking projections (not shown) as locking means for the side cover 4 are provided inside the front rail portion 23.

  As shown in FIGS. 3 to 5, the side cover 4 stands up diagonally forward from the vertical plate portion 6, a substantially rectangular cutout hole 20 provided in the lower half center of the plate portion 6, and the periphery of the cutout hole 20. The protector portion 5 raised and the harness guide portion 25 provided on the rear surface side of the plate portion 6 are integrally configured.

  The plate portion 6 is composed of an intermediate wide portion 6a and front and rear narrow portions 6b and 6c. Both left and right side portions of the wide portion 6a are slide engaging portions with respect to the front rail portion 23. A locking projection (locking means) 26 that engages with a locking projection (not shown) in the rail portion 23 is provided at the lower portion.

  The front narrow portion 6b is positioned at the same height as the rail portion 23 between the pair of front rail portions 23, and the upper end portion of the wide portion 6a is thinned and protrudes upward from the rail portion 23. 2 is located at the same height as the upper step 27 for mounting the upper cover, the rear narrow portion 6c protrudes further upward, and both sides of the narrow portion 6c are a pair of rails on the inner side (rear side) of the frame. The portion 24 is slidably engaged.

  As shown in FIG. 1 and FIG. 3 to FIG. 5, the protector portion 5 is integrally projected on the outer surface of the narrow portion 6 b on the front side. The protector portion 5 is composed of a short horizontal portion 5a following the narrow portion 6b on the front side, and an inclined portion 5b that rises obliquely upward from the horizontal portion 5a. The horizontal portion 5a is a wall portion on the upper, left, and right sides. 5c is formed in a bowl shape with a substantially inverted concave shape in a longitudinal section, and the inclined portion 5b is formed in a substantially L shape in a longitudinal section by being surrounded by a wall on both the upper side and one side (left side), An outward flange portion 5d for winding a tape is formed at the tip of the inclined portion 5b.

  A harness guide portion 25 is integrally provided on the upper inner surface of the rear narrow portion 6c. The harness guide portion 25 has a curved shape having an arcuate surface (curved surface) 25a (FIG. 2) that contacts (adheres to) the outer peripheral surface of the vertical portion 7c of the bent portion 7b of the wire harness 7 in the water intrusion allowable space 8. Harness guide wall (substitute with reference numeral 25), and a band mounting wall (band mounting part) 25c provided integrally below the guide wall 25 and forming a horizontal hole 25b (FIG. 4) for band insertion It is comprised integrally with.

  The guide wall 25 includes a vertical side wall 25d on both the left and right sides and a curved wall portion (substitute with reference numeral 25a) connecting the both side walls 25d, and the both side walls 25d are formed on the rear surface of the rear narrow portion 6c. It is vertically suspended. The band mounting wall 25c is suspended in a curved shape from the central lower end of the curved wall portion 25a, and continues integrally with the rear surface of the narrow portion 6c.

  As shown in FIG. 5 and FIG. 6, the wire harness 7 is raised obliquely upward and upward along the protector portion 5 outside the side opening 3 of the frame 2, and the inclined portion 7 c is tape-wrapped by the tape winding 28. 5 is fixed in the engine room of the vehicle.

  The wire harness 7 is bent vertically upward along the harness guide portion 25 from the notch hole 20 of the side cover 4 in the side opening 3 of the frame 2, and the vertical portion 7 a is a synthetic resin band 29. It is fastened and fixed to the harness guide portion 25 and connected to the terminals of the connector 17 (FIG. 1) at the upper part of the frame 2.

  The band 29 is positioned above the inclined waterproof wall 10 and acts to receive and drop the water that has entered in the upward direction along the vertical portion 7a of the wire harness 7 as indicated by the arrow in FIG. It is also possible to arrange the band 29 below the waterproof wall 10.

  In this way, the waterproofing action of the waterproof wall 10, the sub-waterproof wall 21, and the band 29 compensates for a decrease in waterproofness due to the side cover 4 only on the upper side, and ensures that water that has entered through the cutout holes 20 of the side cover 4 is secured. The water can be dropped and discharged to the lower side of the water entry allowable space 8.

  When the momentum of water entering through the cutout hole 20 is weak, water drops naturally fall as indicated by the arrows in FIG. 5 from the vertical portion 7a of the bent portion 7b of the wire harness 7 without the waterproof wall 10 or the band 29. Discharged. Since the side cover 4 is only one on the upper side and a pair of upper and lower side covers as in the prior art (FIG. 7) is unnecessary, the cost of the side cover 4 and the number of steps for assembling to the frame 2 can be reduced. Become.

  In the above embodiment, the frame 2 is used as the connection box body using the frame 2, the upper cover (not shown), and the lower cover 15. However, for example, a bottomed lower case or lower cover (not shown) is used instead of the frame 2. 1) and an upper cover, and the above-mentioned waterproof structure can also be applied to an electrical junction box using a lower case or a lower cover as a junction box body.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view showing an embodiment of a waterproof structure for an electrical junction box according to the present invention (the circle is a perspective view of a main part). It is a whole top view which similarly shows the waterproof structure of an electrical junction box. It is a perspective view which cuts and shows the principal part of the waterproof structure of an electrical junction box. It is a principal part longitudinal cross-sectional view of the waterproof structure shown in the state which does not route a wire harness. It is a perspective view similarly changing the angle which looks at a waterproof structure. It is the side view made into the partial cross section which shows a waterproof structure similarly. It is a perspective view which shows one form of the waterproof structure of the conventional electrical junction box. It is a longitudinal cross-sectional view which shows the other form of the waterproof structure of the conventional electrical junction box.

Explanation of symbols

1 Electrical junction box 2 Frame (the junction box body)
DESCRIPTION OF SYMBOLS 3 Side part opening 4 Side cover 5 Protector part 6 Plate part 7 Wire harness 7b Bending part 8 Water permeation allowance space 10 Waterproof wall 10a Recess 10e Side part 20 Notch hole 21 Sub waterproof wall 25 Harness guide wall 25c Band attachment wall (band attachment) Part)
29 bands

Claims (5)

A side cover having a diagonally upward protector portion, a vertical plate portion, and a notch hole for inserting a harness is attached to the side opening of the junction box body, and the side cover communicates with the notch hole and has water inside the junction box body. An intrusion allowing space is provided, and the wire harness is bent and routed upward in the water intrusion allowing space along the plate portion from the protector portion, and the water intrusion allowing space is formed along the outer surface of the bent portion of the wire harness. A waterproof structure for an electrical junction box, characterized in that a waterproof wall that projects diagonally downwards is provided . Wherein the waterproof wall, waterproof structure of an electrical connection box according to claim 1, wherein the arc-shaped recesses along the outer peripheral surface of the wire harness is provided. The waterproof structure for an electrical junction box according to claim 1 or 2 , wherein a sub-waterproof wall following the side portion of the waterproof wall is provided vertically below the waterproof wall in the water permeation allowable space. . The electric connection box according to any one of claims 1 to 3 , wherein a band mounting portion is provided on the plate portion, and a bent portion of the wire harness is bound by a band in the water intrusion allowable space. Waterproof structure. The waterproof structure for an electrical junction box according to claim 4 , wherein a harness guide wall is provided on the plate portion above the band mounting portion.

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