JPH0514662Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a technology for draining water accumulated inside an electrical connection box to the outside.

[Conventional technology]

FIG. 3 shows conventional examples of electrical connection boxes such as junction boxes and relay boxes. In the figure, the electrical junction box consists of a main body 2 and a lower cover 1, and the main body 2 includes a relay connector housing 5,
In addition, a multi-pole connector housing 6 is integrally formed on the lower cover 1. The main body 2 and the lower cover 1 are fixed by the locking projections 3 locking into the locking holes 4.

These electrical junction boxes are then fitted with waterproof covers (not shown) to prevent a small amount of water from entering inside. However, if the conditions of use are poor, for example when the device is used for electrical wiring in the engine compartment of a car, water or steam may enter through the terminal holes 5a of the connector housing 5 due to rainwater or temperature changes. There are also cases where it liquefies. Such water droplets stay on the inner bottom surfaces 1a and 1b, touch conductive wiring circuits such as bus bars inside the lid, and generate leakage current, causing trouble. Alternatively, the accumulated moisture may evaporate again due to heat generation inside the electrical junction box, touch a conductive branch circuit such as a bus bar inside the lid, become water droplets, adhere to it, and generate a leakage current. This may cause circuit failure.

In order to prevent this, the inner bottom surface is
Either make it slope downward from one end to the other as shown in 1b, or make it slope downward from one side to the other as shown in 1b, and drill a drainage hole 7 in the corner that is the lower end of the inner bottom surface to collect water. This allows water to drain easily to the outside.

[Problem that the invention attempts to solve]

However, the rib 8 reinforcing the locking protrusion 3
Figure 4 a and b are detailed views of section A' in Figure 3.
As shown in Fig. 2, since the pipe is erected at right angles to the arrow mark C indicating the flow of water, there is a drawback that water tends to accumulate in the part B'.

The present invention aims to eliminate the drawbacks of the prior art described above, and aims to provide a drainage structure for an electrical connection box in which water does not accumulate in the reinforcing rib portion.

[Means for solving problems]

In order to achieve the above object, the present invention provides a lower cover that is locked to the electrical junction box body by a locking member, and has an inclined inner bottom surface and a connector housing that is integrally formed with the lower cover. and a drainage hole penetrating the lower end of the slope of the inner bottom surface, the reinforcing rib of the locking member standing upright between the slopes of the inner bottom surface, It is configured to face diagonally downward from the inner bottom surface.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing one embodiment of the present invention, and is an exploded perspective view of an electrical connection box. Figure 2 a is Figure 1 A
b is a top view.

On the lower side of the electrical junction box body 2, in a place that does not appear in the diagram, there is a conductive branch circuit board such as a bus bar circuit board formed on both the front and back sides. The terminals are protruding. These tab terminals are inserted into the terminal accommodation chambers of the plurality of relay connector housings 5, 5... provided on the main body 2 and the multi-pole connector housing 6 on the lower cover 1 side, and are connected to male and female terminals for connection in the accommodation chambers. Connected. Opposed connector housings 10 are fitted into the multi-pole connector housing 6, and relays (not shown) are fitted into the relay connector housings 5, 5, respectively, to connect the electrical component side and the power source side. It turns out. Since the multi-pole connector housings 6 and 10 have a large number of terminals, a large force is required for mating. Therefore, they are fitted by tightening with the force of a screw, and reference numeral 9 indicates a bolt hole through which a bolt is passed.

The inner bottom surface 1a of the lower cover 1 is designed so that water that has entered the electrical connection box through the terminal hole 5a of the connector housing 5 provided in the main body 2 can be easily discharged to the outside.
is sloped downward from left to right in the figure. The water accumulated inside the electrical connection box reaches the inner bottom surface of the lower cover, flows as indicated by arrow C, and is discharged from the electrical connection box main body through the drain hole 7.
The inclination angle of the inner bottom surfaces 1a and 1b is set to an angle of about 5 degrees or more so that water droplets on the slopes naturally flow downward.

The reinforcing ribs 8 of the locking protrusion 3 are erected not at right angles to the flow of water, but facing diagonally downward on the slope.
Therefore, water that flows from above the slope and reaches part B flows along the ribs 8 and is discharged from the drainage hole, and is no longer retained in part B.

[Effect of idea]

As described above, in the present invention, the lower cover that is locked to the branch junction box is provided with an inclined inner bottom surface, and the reinforcing rib of the locking member that is erected between the slopes of the inner bottom surface is provided with an inclined inner bottom surface. The structure is such that it faces diagonally downward on the bottom surface. Therefore, the water inside the electrical junction box body flows down the sloping inner bottom surface of the lower cover.
Water is drained to the outside through the drainage hole, and no water remains on the reinforcing ribs. Therefore, it is possible to prevent wiring troubles caused by water, such as leakage current flowing from a branch circuit, which is a special effect.

[Brief description of the drawings]

Fig. 1 is an exploded perspective view of an electrical junction box showing one embodiment of the present invention, Fig. 2 shows details of section A in Fig. 1, a is a perspective view, b is a top view, and Fig. 3 is a conventional An exploded perspective view of an electrical junction box showing an example, Figure 4 is Figure 3
Details of part A' are shown, with a being a perspective view and b being a top view. 1...Lower cover, 1a, 1b...Inner bottom surface, 2...
...Electrical connection box body, 3...Latching protrusion, 8...Reinforcement rib.

Claims (1)

[Claims for Utility Model Registration] A lower cover that is locked to the electrical junction box body by a locking member has an inclined inner bottom surface and a connector housing that is integrally formed with the lower cover, In the drainage structure of an electrical junction box in which a drainage hole penetrating the lower end of the slope of the inner bottom surface is formed, a reinforcing rib of the locking member erected between the slopes of the inner bottom surface A drainage structure of an electrical junction box characterized by facing diagonally downward.