JPH0731033A - Electric joint box - Google Patents

Abstract

PURPOSE:To enhance sealing performance without using any rubber packing by a simple structure where the gap between the cover and the box body is eliminated through grinding of inclining faces. CONSTITUTION:An inclining face 22 is formed on the end face of a protrusion 20 provided at the end of the side wall 1a of a box body 1. An inclining face 24 abutting on the inclining face 22 is formed on the inner side face of the outer side wall 10b at a recess 10 in a cover 3. The inclining face 24 is formed steeper than the inclining face 22. When the end of the side wall 1a is inserted into the recess 10, the inclining face 22 abuts at first, at the lower end thereof, on the inclining face 24 which is then pushed to the outside by the inclining face 22 thus opening the wall 11b outward and bringing the inclining faces 22, 24 into tight contact. The side wall 1a is brought, at the forward end face thereof, into tight contact with the rear wall of the recess 10 thus ensuring the sealing performance. Since the inclining faces 22, 24 are brought into tight contact while imparting force to each other, backlash is eliminated in the inserting direction and the direction perpendicular thereto and the sealing performance is sustained positively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric junction box mounted on an automobile or the like.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional electric junction box disclosed in Japanese Utility Model Laid-Open No. 62-51917. This electrical junction box includes a box body 1 having a side wall 1a, and a side wall 1 of the box body 1.
a and a cover 3 which has a side wall 3a whose ends are aligned with each other and closes the opening of the box body 1, and the cover 3 which covers the box body 1
And a lock mechanism 5 that locks in the closed state.

The tip of the side wall 3a on the cover 3 side (lower end in the figure)
As shown in FIG. 5, there is formed a recess 10 into which the tip of the side wall 1a of the box body 1 is inserted. Out of the facing walls 10a and 10b forming the recess 10, the outer wall 10b.
The inner wall surface of the abutment wall 12 orthogonal to the surface direction of the side wall 1a.
A step portion 12 having a is formed. Also, the recess 10
A groove 14 having a constant width for receiving the tip of the side wall 1a on the side of the box body 1 is formed in the inner part of the box, and a rubber packing 16 is inserted in the innermost part of the groove 14.

On the other hand, the box body 1 inserted in the recess 10
An outward flange 18 is formed at the tip of the side wall 1a so as to contact the abutting wall 12a. The position of the collar 18 and
The position of the tip of the side wall 1a of the box body 1 is set so that the upper surface of the flange 18 contacts the abutting wall 12a and the tip of the side wall 1a presses the rubber packing 16 when the cover 3 is closed. There is. In addition, a clearance is secured between the tip of the side wall 1a and the groove 14 so that the tip of the side wall 1a can be easily inserted into the groove 14, and the outer peripheral end of the collar portion 18 and the recess 10 are formed.
Clearance is also secured between the inner surface of and.

In such an electric connection box, when the cover 3 is closed, the rubber packing 16 is mainly used.
The space between the box body 1 and the box body 1 is sealed.

In the example of FIG. 5 described above, the rubber packing 16 is used for sealing, but it is also possible not to use the rubber packing 16. In this case, as it is, as shown in FIG. 6, there is a large space between the tip of the side wall 1a and the groove 14, so that the tip of the side wall 1a is formed by the groove 14 as shown by the chain double-dashed line in FIG. It is better to extend it until it hits the inner wall of the.

[0007]

By the way, since the one shown in FIG. 5 uses the rubber packing 16, the waterproof property is good, but the cost is high.

On the other hand, the one shown in FIG. 6 is a rubber packing 1.
Since 6 is not used, it is advantageous in terms of cost, but
Instead, the clearances at a plurality of locations as shown by A, B, and C in the figure must be managed with high accuracy, which is disadvantageous in terms of manufacturing cost. In particular, as shown in FIG.
A gap P is easily formed between the flange portion 18 and the abutment wall 12a due to the returning action of the lock mechanism, and if the clearance is too large, rattling occurs at this portion. After all, there is a problem that the rattling becomes large depending on the accuracy of the clearance and the sealing performance cannot be sufficiently exhibited.

In view of the above circumstances, it is an object of the present invention to provide an electric junction box which has a simple structure and can improve the sealing property without using rubber packing.

[0010]

The present invention comprises a box body having a side wall, and a cover having a side wall whose tip is aligned with the side wall of the box body and closing the opening of the box body. In the electrical junction box in which a recess is formed in one of the side walls of the cover and the tip of the other side wall is formed, the tip of the other side wall is inclined downward toward the tip side with respect to the surface direction of the side wall. A protrusion having an inclined surface is provided, and one of the opposing walls of the recess is made a flexible wall, an inclined surface that abuts the inclined surface of the protrusion is provided on the inner side surface, and the inclined surface of the protruding portion is set to be smaller than the inclined surface of the recessed portion. It is characterized by being formed in a steep slope.

[0011]

In the electric junction box having the above structure, the slope of the projection is steeper than the slope of the recess, so that when the projection is inserted into the recess, it is pushed by the slope of the projection. The wall surface of the recess is expanded. And as the protrusion is inserted,
Both slopes are brought into close contact with each other, and the close contact surface ensures the sealing property. At this time, since the inclined surfaces are in close contact with each other while exerting a force on each other, rattling in the insertion direction and the direction orthogonal to the insertion direction does not occur. Moreover, since the contact surfaces of both slopes are small at the beginning of insertion, the insertion is smoothly performed.
Further, since both slopes are brought into close contact with each other by rubbing the slopes together, sufficient sealability can be secured without strict control of accuracy.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

The external appearance of the electrical junction box of this embodiment is the same as that shown in FIG. 4, and the main parts thereof are constructed as shown in FIG. In the figure, 1a is a side wall of the box body 1, 3
a is a side wall of the cover 3. A recess 10 is formed at the tip of the side wall 3a of the cover, and a protrusion 20 is formed on the outer surface of the end of the side wall 1a of the box body inserted into the recess 10.

The front end surface of the side wall 1a is the inner wall 10 of the recess 10.
The width, length, etc. are set so as to come into contact with c.
A slope 22 is formed on the end surface of the protrusion 20.
The slope 22 is inclined downward to the tip side with respect to the surface direction of the side wall 1a. Here, Y represents the slope (inclination angle) of the slope 22 with respect to the inner surface of the side wall 1a.

Opposing walls 10a, 10 of the recess 10 of the cover 3
On the inner surface of the outer wall 10b of the inside b, a slope 24 is provided which abuts the slope 22. Other than this, no step or the like is provided and the shape is simplified. When the slope (inclination angle) of the slope 24 with respect to the inner surface of the facing wall 10a is represented by X, the slope 2 of the protrusion 20 described above.
The relationship of Y> X is set between the inclination angle Y of 2 and the inclination angle Y of 2. That is, the slope 24 of the recess 10 is formed to be steeper than the slope 22 of the protrusion 20.

The cover 3 having such a recess 10 is
When fitting into the box body 1 having the protrusion 20, the tip of the side wall 1 a of the box body 1 is inserted into the recess 10. Then, since the slope 24 of the protrusion 20 on the recess 10 side is steeper than the slope 22 of the protrusion 20, the lower end of the slope 22 of the protrusion 20 first moves toward the recess 10 as shown in FIG. Slope 24
Hit When it is further inserted, as shown in FIG. 3, the slope 22 of the protrusion 20 moves outward from the slope 24 on the side of the recess 10 by the arrow A.
As shown by, the wall 10b of the recess 10 is opened to the outside, and both slopes 22 and 24 are in close contact with each other.
Further, at this time, the tip end surface of the side wall 1a of the box body 1 is recessed 10
Adheres to the inner wall of the. The sealing property is secured by these contact surfaces.

In this state, since the slopes 22 and 24 are in close contact with each other while exerting a force on each other, there is no rattling in the insertion direction and the direction orthogonal thereto, and the reliable sealing performance is maintained. Further, at the beginning of insertion, as shown in FIG. 2, the lower end of the inclined surface 22 only hits the opposite inclined surface 24, and the contact surface is small, so that the insertion is smoothly performed. Furthermore, the slopes 22 and 24 are rubbed against each other to form both slopes 22 and 2.
Since 4 is in close contact, good adhesion can be maintained without strict control of accuracy.

[0018]

As described above, according to the present invention,
Since the gap between the cover and the box body is eliminated by rubbing on the slope,
It is possible to suppress rattling and maintain a reliable sealing property. In addition, since the insertion is smoothly performed by the guide of the slope, there is an advantage that the cover can be easily tightened. Further, the manufacturing cost is low because the structure is simple and the accuracy can be set gently.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of the present invention.

FIG. 2 is a main-portion cross-sectional view showing a state where the cover is being fitted to the box body in the embodiment of the present invention.

FIG. 3 is a cross-sectional view of essential parts showing a state after the cover is fitted to the box body in the embodiment of the present invention.

FIG. 4 is an external perspective view showing an example of a conventional electrical junction box.

FIG. 5 is a sectional view of a main part of a conventional electric junction box.

6 is a cross-sectional view showing a main part of a conventional electric junction box, showing a state in which a rubber packing is removed from the example shown in FIG.

FIG. 7 is a cross-sectional view of an essential part for explaining the problems of the conventional electrical junction box.

[Explanation of symbols]

 1 Box Main Body 1a Side Wall 3 Cover 3a Side Wall 10 Recesses 10a, 10b Opposing Wall 20 Projection 22 Slope 24 Slope

Claims (1)

[Claims] 1. A box main body having a side wall, and a cover having a side wall whose ends are aligned with the side wall of the box main body and closing an opening of the box main body, wherein the box main body and one of the side walls of the cover are provided. In an electrical junction box in which a concave portion into which the tip of the other side wall is inserted is formed, a protrusion having a slope inclined downward to the tip side with respect to the surface direction of the side wall is provided at the tip of the other side wall. , One of the opposing walls of the recess is a flexible wall, an inner surface thereof is provided with a slope contacting the slope of the projection, and the slope of the projection is formed to be steeper than the slope of the recess. And electrical junction box.