JP2006067709A - Drainage structure for electrical junction box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drainage structure for electrical junction boxes, wherein moisture in an electrical junction box can be drained to the outside and the ingress of external moisture, mud, and the like into an electrical junction box can be prevented more surely. <P>SOLUTION: The drainage structure for electrical junction boxes includes an drain hole 15, having a substantially funnel-shaped portion 13 that is formed at the bottom wall 2 of an electric junction box 1 and whose base is narrowed as going downward, and a cylinder 14 whose lower end connecting to the substantially funnel-shaped portion 13 has the same inner shape as that of the lowermost end of the substantially funnel-shaped portion 13; and a reflecting member 16 installed at the substantially funnel-shaped portion 13 of the drain hole 15. The reflecting member 16 includes a cone-shaped recess 17, that is open at the bottom and widens going downward, and a fixed flange 18 that is fixed on the substantially funnel-shaped portion 13 of the drain hole 15. The fixed flange 18 is provided with an effluence 19, through which the moisture in the electrical junction box 1 can flow out of the electrical junction box 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement in the drainage structure of an electrical junction box mounted on a vehicle such as an automobile.

For example, in an electrical junction box for automobiles, if water or mud splashed from the road surface enters the electrical junction box while the automobile is running, the electrical equipment in the electrical junction box gets wet, short-circuits, or corrosion occurs. There is a problem of progress.
Therefore, various devices have been conventionally made so that moisture inside the electric junction box can be drained to the outside, and moisture is prevented from entering the electric junction box from the outside.
As an example, for example, Patent Document 1 discloses a drainage structure as shown in FIGS.
In the drainage structure disclosed in Patent Document 1, as shown in FIGS. 4 and 5, the drainage port 3 provided in the bottom wall 2 of the electrical junction box 1 is provided with a plate portion 5 and a central portion of the plate portion 5. The clamp 4 having the provided support column 6 and two elastically deformable blades 7 and 7 extending from the tip of the support column 6 to the vicinity of the plate part 5 connects the blades 7 and 7 from the drain port 3 to the electrical junction box. It is inserted into 1 and assembled.

Further, a guide surface 8 that is slidably fitted to the inner peripheral surface of the drainage port 3 and the inner edge of the drainage port 3 at a position where the clamp 4 is lowered by its own weight are respectively attached to the tip portions of the blades 7 and 7. A stepped portion 9 is provided.
When the clamp 4 is lowered, a gap 10 is formed between the outer surface of the bottom wall 2 and the plate portion 5 so that moisture can escape from the inside of the electrical junction box 1 to the outside as shown in FIG. When an upward external force is applied to the plate portion 5, the plate portion 5 is in the bottom wall with the guide surfaces 8 of the blade portions 7 and 7 fitted to the inner peripheral surface of the drain port 3 as shown in FIG. 2 is in close contact with the outer surface, so that moisture and the like do not enter the electrical junction box 1 from the outside.

  According to the drainage structure of the electrical junction box 1 described in Patent Document 1 as described above, since there is no recess on the lower side of the drainage port 3, the drainage port 3 is not clogged even if mud is applied to the plate part 5. The effect that can be expected.

JP 2001-95129 A

  However, in the drainage structure of the electrical junction box shown in FIGS. 4 to 6, mud actually enters the upper surface of the plate portion 5, that is, the surface that contacts the outer surface of the bottom wall 2 of the electrical junction box 1, or dust or the like When the external force acts upward on the plate portion 5 as shown in FIG. 6, the plate portion 5 cannot be brought into close contact with the outer surface of the bottom wall 2 as shown in FIG. Therefore, there is a problem that moisture or the like cannot be completely prevented from entering the electrical junction box 1.

  In view of the above problems, an object of the present invention is to drain the moisture in the electrical junction box to the outside, and to more reliably prevent moisture, mud and the like from entering the electrical junction box from the outside. Is to provide.

  In order to achieve the above object, a drainage structure for an electrical junction box according to claim 1 of the present invention comprises a substantially funnel-shaped portion which is provided on the bottom wall of the electrical junction box and which has a base end portion that contracts downward. A drain port composed of a cylindrical portion having a lower end following the funnel-shaped portion having the same inner shape as the innermost shape of the lowermost end of the substantially funnel-shaped portion, and a reflective member installed in the substantially funnel-shaped portion of the drain port The reflection member has a mortar-shaped concave portion that opens downward and expands downward, and a fixing hook portion that is fixed to a substantially funnel-shaped portion of the drainage port. And the outflow part which the water | moisture content in the said electrical-connection box can flow out of the electrical-connection box is provided in this fixed collar part, It is characterized by the above-mentioned.

  According to the drainage structure of the electrical junction box according to claim 1, the moisture in the electrical junction box can be reliably drained to the outside from the outflow portion provided in the fixed flange portion of the reflecting member, Moisture, mud, and the like to enter from the outside of the connection box are cut off from the intrusion path by the mortar-shaped recess provided in the lower part of the reflecting member, and cannot easily enter the electrical connection box.

  The drainage structure for an electrical junction box according to claim 2 of the present invention is the drainage structure for electrical junction box according to claim 1, wherein the inner edge of the base end portion and the inner edge of the lower end portion of the cylindrical portion of the drainage port are formed in a diagonal shape. All the extended lines of the straight line are connected to any position of the inner surface of the mortar-shaped recess of the reflecting member.

  According to the drainage structure for an electrical junction box according to claim 2, the base end inner edge and the lower end inner edge of the cylindrical portion are diagonally connected to each other in the cylindrical portion at the lower end of the drain outlet. It is formed so that all the straight extension lines tied in a shape collide with any position of the inner surface of the mortar-shaped recess of the reflecting member, so that it jumps off the road surface while driving and tries to enter the electric junction box. Moisture, mud, etc. that surely collide with the inner surface of the mortar-shaped recess provided in the lower part of the reflecting member, are blocked, and are formed between the fixed flange provided in the reflecting member and the drain outlet It becomes difficult to enter the outflow part which is a passage of moisture. Therefore, it is possible to more reliably prevent moisture from entering the electrical junction box from the outside through the drain port.

  As described above, according to the present invention, the drainage structure of the electrical junction box can drain the moisture in the electrical junction box to the outside and can more reliably prevent moisture and mud from entering the electrical junction box from the outside. Can be provided.

Hereinafter, the drainage structure of the electrical junction box of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a longitudinal sectional view showing an embodiment of a drainage structure for an electrical junction box according to the present invention. FIG. 2 is a perspective view showing a state where the reflecting member in FIG. 3 is a longitudinal sectional view for explaining the operation of the drainage structure of the electrical junction box of the present invention.

As shown in FIG. 1, in the drainage structure for an electrical junction box according to the present invention, a substantially funnel-shaped portion 13 that contracts toward the bottom wall 2 of the electrical junction box 1 as the base end portion goes downward, and the substantially funnel-shaped configuration. A drain port 15 is provided in which a lower end portion following the portion 13 is formed of a cylindrical portion 14 having the same inner shape as the innermost shape of the lowermost end of the substantially funnel-shaped portion 13, and the substantially funnel shape of the drain port 15 is further provided. A reflection member 16 is installed in the portion 13.
Here, having an inner shape that is the same shape as the innermost shape of the lowermost end of the substantially funnel-shaped portion 13 has an inner shape that is substantially equal in shape and size to the inner shape of the lowermost end of the substantially funnel-shaped portion 13. means.

The reflecting member 16 has a mortar-shaped concave portion 17 that opens downward and expands downward, and a fixing hook portion 18 that is fixed to the substantially funnel-shaped portion 13 of the drain port 15. The fixed flange 18 is provided with an outflow portion 19 through which moisture in the electric connection box 1 can flow out of the electric connection box 1.
Incidentally, in this embodiment, as shown in FIG. 2, the fixed flange 18 is composed of three flanges separated in the circumferential direction, and a gap between the flanges is moisture in the electrical connection box 1. Is an outflow part 19 for allowing the electric connection box 1 to flow out to the outside.
By the way, as this outflow part 19, the through-hole connected from the inside of the electrical junction box 1 to the exterior at an appropriate space | interval in the circumferential direction of the circular fixed collar part 18, for example can be provided, and this can also be used as the outflow part 19. In any case, the shape of the outflow portion 19 is not limited as long as it connects the inside and the outside of the electrical junction box 1 and allows moisture to escape from the inside of the electrical junction box 1 to the outside.

  Thus, in the drainage structure of the electrical junction box 1 shown in FIGS. 1 and 2, as shown in FIG. 3, an arbitrary position 14 a of the inner edge of the base end of the cylindrical portion 14 of the drain outlet 15 and the inner edge of the lower end are provided. The length of the cylindrical portion 14 and the size of the cross section are set so that all the straight extension lines A connecting the arbitrary positions 14b diagonally collide with any position on the inner surface of the mortar-shaped recess 17 of the reflecting member 16. If it is determined and formed, moisture or mud that jumps up from the road surface while the automobile is running and enters linearly from the lowermost end of the cylindrical portion 14 is surely mortar-shaped recess 17 as indicated by the tip of the extension line A. It is extremely difficult to hit the inner surface of the mortar-like recess 17 or adhere to the inner surface of the mortar-shaped recess 17 and then drop and enter the inside of the electrical junction box 1 through the gap of the outflow portion 19.

In other words, even when moisture or mud goes straight from the bottom to the top in the cylindrical portion 14, it always hits any position on the inner surface of the mortar-shaped recess 17 of the reflecting member 16. The water or mud splashed at an angle smaller than this, that is, an angle close to vertical, naturally hits the inner surface of the mortar-shaped recess 17 of the reflecting member 16 and is bounced back.
Thus, according to the drainage structure of the electrical junction box of the present invention, it is possible to more reliably prevent moisture and mud from entering the electrical junction box 1 from the drain port 15 from the outside.

In addition, even if the invading mud remains attached to the inner surface of the substantially funnel-shaped portion 13 of the reflecting member 15, in the case of the drainage structure of the electric junction box of the present invention, there is no movable part. The mud adhering to the shaped part 13 does not help the moisture and mud entering from the lower end of the tubular part 14 to enter the electrical junction box 1.
Therefore, over time, the moisture and mud are not likely to enter the inside of the electrical junction box 1 from the outside via the cylindrical portion 14, and the electrical junction box 1 can be stably externally supplied over a long period of time. It is possible to reliably prevent moisture and mud from entering the inside.

Incidentally, in the drain port 15 shown in FIG. 1, a step 20 is provided in the middle of the substantially funnel-shaped portion 13, and the fixing flange portion 18 of the reflecting member 16 is fixed to the step 20. May be provided at the end 21 of the fixed flange 18 so that the fixed flange 18 is taper-fitted to the substantially funnel-shaped portion 13 of the drain port 15 and fixed.
Incidentally, in the present invention, the meaning of fixing the fixed flange 18 to the substantially funnel-shaped portion 13 of the drain port 15 means that the fixed flange 18 is attached to the substantially funnel-shaped portion 13 of the drain port 15 by, for example, ultrasonic welding, adhesive or The meaning of joining and fixing by caulking or the like, and as described above, the end 21 of the fixed flange 18 is inclined along the inclination of the substantially funnel-shaped portion 13, and the fixed flange 18 is connected to the substantially funnel of the drain port 15. The case where the taper is fitted so as to be tightly fitted without joining to the shape portion 13 is also included. In short, it is sufficient that the reflecting member 16 does not jump due to vibration or the like in the substantially funnel-shaped portion 13 of the drain port 15.

  Moreover, although the cross-sectional shape of the substantially funnel-shaped part 13 and the cylindrical part 14 of the drain outlet 15 is generally circular, in the present invention, not only the circular shape but also other shapes such as a square cross-section may be used. Good. Basically, if the cross-sectional shape of the lowermost end of the substantially funnel-shaped portion 13 and the cross-sectional shape of the cylindrical portion 14 are matched, it is preferable that moisture easily flows to the outside.

  As described above, according to the present invention, water in the electrical junction box can be drained to the outside, and drainage of the electrical junction box can be more reliably prevented from entering moisture, mud, and the like from the outside into the electrical junction box. Structure can be provided.

It is a longitudinal cross-sectional view which shows one Example of the drainage structure of the electrical junction box of this invention. It is a perspective view which shows the state which turned the reflection member used for the drainage structure of the electrical junction box of this invention shown in FIG. 1 upside down. It is a longitudinal cross-sectional view for demonstrating the effect | action of the drainage structure of the electrical junction box of this invention. It is a longitudinal cross-sectional view which shows an example of the drainage structure of the conventional electrical junction box. It is a perspective view of the clamp used in the drainage structure of the electrical junction box shown in FIG. It is a longitudinal cross-sectional view which shows operation | movement of the drainage structure of the conventional electrical junction box shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrical junction box 2 Bottom wall 13 Substantially funnel-shaped part 14 Tubular part 15 Drain outlet 16 Reflective member 17 Mortar-shaped recessed part 18 Fixed collar part 19 Outflow part

Claims (2)

  The bottom part of the electric junction box is provided with a substantially funnel-like part that is reduced in shape as the base end is lowered downward, and the lower end following the substantially funnel-like part is the same shape as the innermost shape of the lowermost part of the substantially funnel-like part. A drainage structure for an electrical junction box having a drain outlet formed of a cylindrical portion having an inner shape and a reflecting member installed at the substantially funnel-shaped portion of the drain outlet, the reflecting member opening downward and below A mortar-shaped concave portion that expands toward the bottom and a fixing hook portion fixed to the substantially funnel-shaped portion of the drain outlet, and moisture in the electric connection box is placed outside the electric connection box in the fixing hook portion. A drainage structure for an electrical junction box, characterized in that an outflow part capable of flowing out is provided.   The straight line extending diagonally between the inner edge of the base end and the lower edge of the cylindrical portion of the drain outlet hits any position on the inner surface of the mortar-shaped recess of the reflecting member. Item 3. A drainage structure for an electrical junction box according to Item 1.

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