JP3454459B2 - Waterproof structure of electrical junction box - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for an electric junction box. 2. Description of the Related Art In FIG. 4, an electric connection box 1 has a box body 2 and a cover 3 formed by pressing an iron plate.
Consisting of Inside the box main body 2, electric components (not shown) such as fuses and relays and a bus bar wiring board are accommodated in a state where they are electrically connected. The box body 2 is open at the top and has a front wall cut out to form an opening 2a. Abutment surface 4 for the cover 3 is formed around the opening 2a. The surface 4 is provided with a plurality of screw insertion holes 5. Abutment surface 6 of cover 3 against box body 2
, A screw insertion hole 7 corresponding to the screw insertion hole 5 is formed. [0005] As shown in FIG. 5, the electric junction box 1 is formed by interposing a gel-like sealing material 8 between the butting surfaces 4 and 6 and tightening and fixing them with bolts 9 and nuts 10. , With a waterproof seal. In the above prior art, the upper part of the box body 2 is opened and the front wall is cut out to form an opening 2a over a wide area. The range of application is wide. In addition, since the sealing material 8 interposed between the butting surfaces 4 and 6 is gel-like, it is very difficult to tighten the bolts 9 so that a uniform waterproof seal is achieved. That is, in some places, the sealing material 8 is excessively pressed, so that the butt surfaces 4 and 6 rise as shown by phantom lines in FIG. 5, and the sealing material 8 protrudes. As a result, there is a problem that the waterproof sealing property becomes uneven and the reliability of the waterproof structure is reduced. The present invention has been made to solve the above-mentioned problems, and therefore, even if a gel-like sealing material is interposed between a mating surface of a cover of a box main body and a mating surface of a cover, the entirety of the present invention is provided. An object of the present invention is to provide a highly reliable waterproof structure of an electric junction box in which a uniform waterproof seal is formed. In order to achieve the above object, according to the present invention, a plurality of screw insertion holes are formed in a mating surface of a box body and a cover, and a plurality of screw holes are formed between the mating surfaces. In a waterproof structure of an electric junction box, which is tightened and fixed with a gel-like sealing material interposed therebetween, and waterproofly sealed, the mating surface of the box main body is convex toward the cover and the upper portion is
When butt surface of the cover and abuts store the sealing member
In both cases, a configuration is provided in which a weir-shaped seal reservoir that surrounds the entire circumference of the screw insertion hole is provided. An embodiment of the present invention will be described below with reference to the drawings. 1 is an exploded perspective view of the electric junction box, FIG. 2 is an enlarged view of a seal reservoir provided between the mating surfaces in FIG. 1, and FIG. 3 shows a state where a sealing material is interposed between the mating surfaces in FIG. It is sectional drawing. The same components as in the conventional example are denoted by the same reference numerals, and description thereof is omitted. In FIG. 1, an electric connection box 1 includes a box body 2 and a cover 3 thereof.
Are provided with a plurality of screw insertion holes 5 and 7. Also,
An upper case 11 and a busbar wiring board 1 are provided inside the box body 2.
2 are housed in an electrically connected state. In the upper case 11, connectors 13a, 13b... (To be collectively referred to as a connector 13) to which electric components (not shown) such as a fuse, a relay, a voltage sensor, and a voltage detector are assembled are arranged on a substrate 14. . Busbars 15 are disposed on the upper and lower surfaces of the busbar wiring board 12, and tabs 15a and 15b of each busbar project upward and downward. The connector 13 is electrically connected to the tab 15a via a female-female relay terminal (not shown). The above configuration is the same as that of the conventional example. However, according to the present invention, as shown in FIGS. 1 to 3, a weir shape for storing the sealing material 8 on the mating surface 4 on the box body 2 side. A plurality of seal reservoirs 16 are provided. Each seal reservoir 16 is provided around the screw insertion hole 5 and formed in a wall shape protruding toward the butting surface 6 on the cover 3 side. The seal reservoir 16 is formed by stamping out the screw insertion hole 5 and stamping out the circle when the butting surface 4 is pressed.
The launch height is appropriately set in consideration of the sealing property of the sealing material 8. In the above configuration, a gel-like sealing material 8 is applied to the abutting surface 4 of the box body 2, and the sealing material 16 is also filled with the sealing material 8. Match each other. Next, the bolt 9 is inserted from the screw insertion hole 7 on the cover 3 side, and is inserted through the sealing material 8 into the screw insertion hole 5 on the box body 2 side. When the bolt 9 is tightened with the nut 10, as shown in FIG. 3, the butting surface 6 on the cover 3 abuts on the upper part of the seal reservoir 16, and the box body 2 and the cover 3 are firmly fixed. Therefore, even if the bolt 9 is tightened with the nut 10, the distance between the butting surfaces 4 and 6 is kept constant by the contact between the butting surface 6 on the cover 3 and the upper part of the seal reservoir 16. The sealing material 8 interposed between the butting surfaces 4 and 6 is made uniform. This prevents the sealing material 8 from protruding due to excessive tightening. In addition, since the seal material 8 is also stored inside the seal reservoir 16, intrusion of water from the screw insertion holes 5 and 7 is reliably prevented. It is preferable that a gel is used for the above-mentioned sealing material. According to the present invention, as described above, a plurality of screw insertion holes are formed in the abutting surface of the box body and the cover, and a gel-like sealing material is interposed between the abutting surfaces. In the waterproof structure of the electrical junction box, which is tightened and fixed, and waterproofly sealed, the sealing material is stored on a butt surface of the box body,
Since it is provided with a weir-shaped seal reservoir that engages with the butt surface of the cover, even if the bolt is tightened with a nut,
The contact between the butted surface on the cover side and the upper part of the seal reservoir keeps the distance between the two butted surfaces constant, so that the sealing material can be made uniform. As a result, it is possible to prevent the sealing material from protruding due to excessive tightening. [0017] the entire circumference of the previous Symbol seal reservoir the screw insertion hole
Is to besieged . Since the seal material is also stored inside the seal reservoir, it is possible to reliably prevent water from entering through the screw insertion hole. In addition, since the sealing material can be uniformly stored around the screw insertion hole, the sealing performance is stabilized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing an embodiment of a waterproof structure of an electric junction box according to the present invention. FIG. 2 is an enlarged view of A in FIG. 1; FIG. 3 is a cross-sectional view showing a state where a sealing material is interposed between the butting surfaces in FIG. 1; FIG. 4 is a perspective view showing a waterproof structure of a conventional electric junction box. FIG. 5 is a cross-sectional view showing a state where a sealing material is interposed between the butting surfaces in FIG. 4; [Description of Signs] 1 Electrical connection box 2 Box body 3 Covers 4, 6 Butt surfaces 5, 7 Screw insertion holes 8 Seal material 9 Bolts 10 Nuts 16 Seal reservoir

Claims (1)

(57) [Claims 1] A plurality of screw insertion holes are formed in the abutting surface of the box body and the cover, and a gel-like sealing material is interposed between the abutting surfaces and tightened. In the waterproof structure of the electric connection box, which is fixed and waterproof-sealed, the electric connection box is formed so as to protrude toward the cover on the mating surface of the box body .
One top in contact with the abutting surface of the cover sump the sealant Rutotomoni, electrical connection, characterized in that a reservoir <br/> weir-like sealing surrounding the entire circumference of the screw insertion hole Box waterproof structure.