JP6230187B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electrical junction box that is mounted on an automobile and mainly performs power distribution.

  There are various electrical connection boxes mounted on automobiles. For example, a structure with a waterproof structure that prevents water from entering the case 301, such as the electrical connection box 310 shown in FIG. (For example, refer to Patent Document 1).

  The case 301 of the electrical junction box 310 shown in FIG. 5 includes a case main body 302 that houses electronic components, and a cover 303 that covers the opening 320 of the case main body 302. The case main body 302 has a case main body side peripheral wall 322 that surrounds the opening 320 and an opposing wall 305 that is disposed outside the case main body side peripheral wall 322 and faces the case main body side peripheral wall 322. The cover 303 has a cover-side peripheral wall 332, and the end of the cover-side peripheral wall 332 is composed of double walls 306 and 307.

  In the state where the cover 303 is positioned at the closed position covering the opening 320, the end of the opposing wall 305 is positioned between the double walls 306 and 307, and the end portion of the opposing wall 305 is located between the opposing wall 305 and the case body side peripheral wall 322. A heavy wall inner wall 306 is positioned.

  In such an electrical junction box 310, when water enters the case 301 from a joint portion between the opposing wall 305 and the double wall outer wall 307, the water is separated from the opposing wall 305 and the case as indicated by an arrow G1. It progresses to the space between the main body side peripheral wall 322, falls in the space by its own weight, and is discharged out of the case 301.

JP 2013-034320 A

  However, the electrical junction box 310 may be fixed to the vehicle body sideways as shown in FIG. In other words, the electrical junction box 310 may be fixed to the vehicle body in such a direction that the joint portion between the opposing wall 305 and the double wall outer wall 307 is located on the upper surface of the case 301. In that case, water that has entered the case 301 from the joint between the opposing wall 305 and the double wall outer wall 307 and has entered the space between the opposing wall 305 and the case body side peripheral wall 322, or the opposing wall 305. The water that has entered the case 301 from between the end portion away from the cover 303 and the case body side peripheral wall 322 passes between the double wall inner wall 306 and the case body side peripheral wall 322 as indicated by an arrow G2. There is a problem that the electronic component may reach a space in which the electronic component is accommodated.

  Therefore, the present invention provides an electrical junction box that can prevent water from reaching the space in which the electronic component is housed even when the cover and the case body are fixed to the vehicle body in a direction in which the mating portion is located on the upper surface. For the purpose.

  The invention described in claim 1 includes a case main body that accommodates an electronic component, and a cover that covers an opening of the case main body, the case main body surrounding the opening, and a case main body side peripheral wall; And an opposing wall disposed opposite to the case main body side peripheral wall, the cover has a cover side peripheral wall, and the end of the cover side peripheral wall has two ends. An electrical junction box that is formed of a heavy wall, the end of the opposing wall is positioned between the double walls, and the inner wall of the double wall is positioned between the opposing walls and the case body side peripheral wall The electrical connection box is characterized in that an end of the case main body side peripheral wall facing the facing wall is folded back in a U shape, and the folded portion overlaps the inner wall of the double wall.

  According to a second aspect of the present invention, in the first aspect of the present invention, the cover-side peripheral wall is fixed to the vehicle body in such a direction that the one surface of the cover side peripheral wall is an upper surface, and the folded-back to the inner wall of the double wall located on the upper surface. The parts overlap each other.

  According to the first and second aspects of the invention, the end portion of the case body side peripheral wall facing the opposing wall is folded in a U shape, and the folded portion overlaps the inner wall of the double wall. Even if water enters the space between the facing wall and the case body side peripheral wall and the water travels along the case body side peripheral wall toward the cover side, the water is returned to the opposite side of the cover by the folded portion. , It cannot proceed to the cover side from the folded portion. Therefore, even when the electrical junction box is fixed to the vehicle body in such a direction that the mating portion of the cover and the case main body is located on the upper surface, it is possible to prevent water from reaching the space in which the electronic component is accommodated.

It is a perspective view of the electrical junction box concerning one embodiment of the present invention. It is a cross-sectional perspective view along the AA line in FIG. FIG. 3 is an enlarged view of the vicinity of an opposing wall shown in FIG. 2. It is explanatory drawing for demonstrating the effect | action of the waterproof structure shown by FIG. It is sectional drawing of the conventional electrical junction box. It is sectional drawing which shows the state which the electric junction box shown by FIG. 5 rotated 90 degree | times.

  An “electric connection box” according to an embodiment of the present invention will be described with reference to FIGS. The electric junction box 10 shown in FIGS. 1 and 2 is mounted on an automobile and mainly performs power distribution.

  The electrical junction box 10 includes a case 1 that includes a case main body 2 and a cover 3 that covers an opening 20 of the case main body 2. The case body 2 and the cover 3 are connected by a hinge portion 4. The cover 3 opens and closes the opening 20 by rotating in the direction of arrow B in FIG. Further, the case 1 is provided with a plurality of lock portions 11 and lock receiving portions 12 for maintaining the state in which the cover 3 is positioned at the closed position. The case body 2, the cover 3, and the hinge portion 4 are integrally formed of synthetic resin.

  The case main body 2 is formed in a box shape having a plate portion 21 and a case main body side peripheral wall 22 which stands from the outer edge of the plate portion 21 and surrounds the opening 20. An electric wire insertion hole 23 is formed in the surface 22 d of the case body side peripheral wall 22. The case body 2 includes brackets 24 and 25 that are bolted to the vehicle body. The case body 2 accommodates a plurality of electronic components 13 and 14 such as relays and fuses. The plurality of electronic components 13 and 14 are accommodated in the case body 2 in a state of being mounted on the blocks 15 and 16. The blocks 15 and 16 are locked to the inner surface of the case body 2.

  The cover 3 includes a plate portion 31 that faces the plate portion 21 of the case body 2 in a state where the cover 3 is positioned at a closed position that covers the opening portion 20, and a cover-side peripheral wall 32 that is erected from the outer edge of the plate portion 31. ing. In the closed state of the case 1, the end of the cover side peripheral wall 32 and the end of the case main body side peripheral wall 22 are overlapped with each other.

  Such an electrical junction box 10 is fixed to the vehicle body in such a direction that the surface 32c of the cover side peripheral wall 32 and the surface 22c of the case main body side peripheral wall 22 become the upper surface of the case 1. Furthermore, the electrical junction box 10 includes a waterproof structure that prevents water from entering the case 1. Hereinafter, this waterproof structure will be described.

  An end of the cover side peripheral wall 32 on the case body 2 side is constituted by a double wall including an inner wall 6 and an outer wall 7. The double walls 6 and 7 are formed over the entire circumference of the cover side peripheral wall 32.

  The case main body 2 has an opposing wall 5 that is disposed outside the surface 22c of the case main body side peripheral wall 22 and faces the surface 22c. The opposing wall 5 is spaced from the surface 22c. The facing wall 5 is connected to the surface 22 c by a plurality of connecting ribs 26. The end of the facing wall 5 on the cover 3 side is positioned between the double walls 6 and 7. As shown in FIG. 3, a convex portion 51 that protrudes toward the outer wall 7 of the double wall is provided at the end of the facing wall 5 on the cover 3 side. The outer wall 7 of the double wall is provided with a stepped portion 71 that comes into contact with the convex portion 51. The space between the facing wall 5 and the surface 22c communicates with the outside of the case 1 at the end of the facing wall 5 on the side away from the cover 3.

  The surface 22c of the case main body side peripheral wall 22 is provided with a waterproof groove portion 9 formed in a groove shape opened to the plate portion 21 side.

  A double wall inner wall 6 is positioned between the opposing wall 5 and the surface 22c of the case main body side peripheral wall 22. The end of the case main body side peripheral wall 22 facing the opposing wall 5 is folded back in a U shape, and the folded portion 8 overlaps the inner wall 6 of the double wall. Further, as shown in FIG. 3, a first portion 81 that is bent at a substantially right angle toward the facing wall 5 at the end portion of the case body side peripheral wall 22 on the cover 3 side, and the cover 3 from the end portion of the first portion 81. And the second portion 82 bent at a substantially right angle to the opposite side are referred to as a “folded portion 8”. The second portion 82 overlaps the double wall inner wall 6.

  As shown in FIG. 2, the case main body 2 further includes a waterproof wall 27 and a connecting portion 28 provided on the entire circumference except for the surface 22 c of the case main body side peripheral wall 22. The waterproof wall 27 is disposed outside the case main body side peripheral wall 22 and faces the end of the case main body side peripheral wall 22 on the cover 3 side. The connecting portion 28 connects the end portion of the waterproof wall 27 away from the cover 3 and the case body side peripheral wall 22. The waterproof wall 27 is positioned between the double walls 6 and 7. A double wall inner wall 6 is positioned between the waterproof wall 27 and the case body side peripheral wall 22.

  The electrical junction box 10 having the waterproof structure described above is particularly likely to be splashed with water on the upper surface of the case 1 in a state of being fixed to the vehicle body. However, the electrical junction box 10 can prevent water from reaching the space in which the electronic components 13 and 14 are accommodated as follows due to the waterproof structure described above.

  As shown by an arrow F1 in FIG. 4, when water enters the case 1 from a joint portion between the opposing wall 5 and the outer wall 7 of the double wall, the water is separated from the opposing wall 5 and the case main body side peripheral wall 22. It goes to the space between and is discharged out of the case 1 from the opposite side of the cover 3. In addition, in the upper surface part of case 1, since the said convex part 51 and step part 71 are provided, it becomes difficult for water to enter into case 1 from the joint part of the opposing wall 5 and the outer wall 7 of a double wall. ing.

  Further, as indicated by an arrow F2 in FIG. 4, water enters the space between the opposing wall 5 and the case main body side peripheral wall 22 from the opposite side of the cover 3, and the water travels along the case main body side peripheral wall 22. Even if it goes to the cover 3 side, the water is returned to the opposite side of the cover 3 by the folded-back portion 8 and cannot go to the cover 3 side rather than the folded-back portion 8. This water is later discharged out of the case 1 from the opposite side of the cover 3.

  Furthermore, as indicated by an arrow F3 in FIG. 4, the water traveling toward the cover 3 side along the surface 22c of the case body side peripheral wall 22 is returned to the opposite side of the cover 3 by the waterproof groove 9, so that from the opposite side of the cover 3 It is difficult for water to enter the space between the facing wall 5 and the case body side peripheral wall 22.

  Further, in the above-described embodiment, the example in which the electric junction box 10 is fixed to the vehicle body in the lateral direction in which the surface 32c of the cover side peripheral wall 32 and the surface 22c of the case main body side peripheral wall 22 are the upper surface of the case 1 has been described. The connection box 10 may be fixed to the vehicle body in a vertical orientation in which the surface 32c of the cover side peripheral wall 32 and the surface 22c of the case main body side peripheral wall 22 are the side surfaces of the case 1.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

2 Case body 3 Cover 5 Opposite wall 6 Double wall inner wall 7 Double wall outer wall 8 Folded portion 10 Electrical junction box 20 Opening portion 22 Case body side peripheral wall 32 Cover side peripheral wall

Claims (2)

A case main body that houses the electronic component, and a cover that covers the opening of the case main body,
The case body has a case body side peripheral wall surrounding the opening, and an opposing wall disposed on the outside of at least a part of the case body side peripheral wall and facing the case body side peripheral wall;
The cover has a cover side peripheral wall, and an end portion of the cover side peripheral wall is constituted by a double wall,
In the electrical junction box, the end of the opposing wall is positioned between the double walls, and the inner wall of the double wall is positioned between the opposing wall and the case body side peripheral wall.
An electrical junction box, wherein an end of the case body side peripheral wall facing the opposing wall is folded back in a U shape, and the folded portion overlaps the inner wall of the double wall. The electrical junction box according to claim 1, wherein one surface of the cover side peripheral wall is fixed to the vehicle body in such a direction that the upper surface is an upper surface, and the folded portion overlaps an inner wall of a double wall located on the upper surface.

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