JP2000223857A - Moisture-proof structure of box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the moisture-proof structure of a box by which the moisture-proofness can be improved and high moisture-proof effect can be obtained. SOLUTION: A moisture-proof structure has an annular sealing material 4 which is provided in a junction between a cover 3 and a box main part 2 and tightly seals the junction when the upper opening of the box main part 2 is covered with the cover 3. An annular protrusion 9 which presses approximately the whole lower surface of the sealing material 4 is formed on the part of the box main part 2 which is joined with the cover 3. As the annular protrusion 9 presses approximately the whole lower surface of the sealing material 4 to compress the sealing material 4 when the upper opening of the box main part is closed by the cover, a sealing area is substantially increased and high moisture-proof effect can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for various boxes mounted on a vehicle such as an automobile, for example, a waterproof box provided in an engine room for accommodating an electric connection box and the like.

[0002]

2. Description of the Related Art As a conventional waterproof structure for a box, for example, one disclosed in Japanese Utility Model Laid-Open No. 1-58983 is known. In this waterproof structure, FIGS.
As shown in FIG. 2, when the upper opening of the box body 20 is closed with the cover 21 and the both are fixed, the annular sealing material 2 fixed in the groove frame 22 extending along the outer periphery of the lower end of the cover 21.
The box 3 is sealed by being pressed and compressed by the upper end 25 of the outer wall 24 of the box body 20.

[0003]

In the conventional waterproof structure of the box, the upper end 25 of the outer wall 24 of the box body 20 is used.
The box is sealed by pressing a part of the sealing material 23 with the outer wall 24.
The position where the upper end 25 of the seal member 23 compresses the sealing material 23 and the amount of compression may vary, and the waterproof effect of the sealing material 23 may be reduced. Further, since the sealing material 23 is compressed at the upper end 25 of the narrow outer wall 24, the sealing area, that is, the contact area between the upper end 25 and the sealing material 23 is small, and a high waterproof effect cannot be obtained.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a waterproof structure of a box which can improve waterproofness and obtain a high waterproof effect.

[0005]

According to a first aspect of the present invention, when an upper opening of a box body is closed with a cover, an annular seal interposed at a joint portion between the cover and the box body. It is a waterproof structure of a box sealed with a material, and one of the joints of the cover and the box body,
An annular projection is provided for pressing substantially the entire surface of the annular seal material. According to this configuration, when the upper opening of the box body is closed by the cover, the annular protrusion provided on one of the joining portions of the cover and the box body presses and compresses substantially the entire surface of the annular sealing material. Therefore, the sealing area, that is, the contact area between the sealing material and the annular projection is greatly increased as compared with the conventional example, and a high waterproof effect is obtained.

The invention according to claim 2 is characterized in that the other of the joints between the cover and the box body is an annular recess having a shape substantially matching the annular projection. According to this configuration, when the upper opening of the box body is closed with the cover, both surfaces of the sealing material are pressed by the annular projection and the annular recess, respectively, so that one surface of the sealing material that comes into contact with the annular projection. A large sealing area is obtained not only on the side but also on the other side of the sealing material that comes into contact with the annular concave portion, and the waterproof property is improved by that much.

According to a third aspect of the present invention, the annular projection has a central flat portion pressing a central portion in the width direction of one surface of the sealing material,
It is characterized by having inner and outer inclined surface portions extending inclining from both ends of the central plane portion, respectively. According to such a configuration, the annular protrusion presses and compresses the sealing material at the three positions of the central flat surface and the inner and outer inclined surfaces, so that the waterproofness is further improved. Also, since the sealing portion where the sealing material and the annular projection come into contact is bent in a maze shape,
Water is more difficult to infiltrate, and the waterproofness is further improved.

The invention according to claim 4 is characterized in that the annular projection has:
Furthermore, an inner and outer flat portion extending from the inner and outer inclined surfaces, respectively, is provided. According to this configuration, the annular projection presses and compresses the sealing material not only at the three locations but also at the inner and outer flat portions, so that the waterproofness is further improved.

According to a fifth aspect of the present invention, the cover has a peripheral wall having an annular groove fitted to the peripheral wall so as to cover at least an inner surface and an outer surface near the upper end of the peripheral wall of the box main body. And the upper end of the peripheral wall of the box body constitutes the above-mentioned joining portion joined via a sealing material. According to this configuration, when the upper opening of the box main body is closed with the cover, the annular groove of the peripheral wall of the cover is fitted to the peripheral wall of the box main body so as to cover at least the inner surface and the outer surface near the upper end of the peripheral wall of the box main body, Moreover, since the sealing material is compressed between the upper end of the annular groove at the highest position of the fitting portion of the both peripheral walls and the upper end of the peripheral wall of the box body, water does not easily enter the sealing portion formed by the sealing material, and is waterproof. The properties are further improved.

In the invention according to claim 6, the peripheral wall of the cover is
It is characterized in that it extends to the vicinity of the lower end of the peripheral wall of the box main body and is fitted to the peripheral wall of the box main body so as to cover the entire inner surface and outer surface thereof. According to such a configuration, the fitting length between the peripheral wall of the cover and the peripheral wall of the box main body is increased, and water is less likely to permeate.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a waterproof structure of a box according to an embodiment of the present invention, FIG. 2 is a partial sectional view showing an enlarged part of FIG. 1, and FIG. 3 is shown in FIG. FIG. 4 is a sectional view taken along line AA of FIG. 3 of the sealing material used for the box.

In the waterproof structure of the box according to the present embodiment, as shown in FIG. 1, the upper opening of the box body 2 of the box 1 is closed with the cover 3 of the box 1 so that the cover 3 and the box body 2 are not closed. When the box 1 is fixed with the fixing tool shown in the figure, the box 1 is hermetically sealed by an annular sealing member 4 (see FIG. 3) interposed at the joint between the box body 2 and the cover 3.

The cover 3 is provided with a peripheral wall 7 having an annular groove 6 fitted to the peripheral wall 5 so as to cover the inner and outer surfaces near the upper end of the peripheral wall 5 of the box body 2. The peripheral wall 7 comprises an outer wall 7a and an inner wall 7b, and the two walls 7a, 7b
Upper end of annular groove 6 formed between peripheral wall 5 of box body 2
And an upper end thereof form a joining portion to be joined via an annular sealing material 4. On the outer surface near the upper end of the peripheral wall 5 of the box body 2, an annular stopper 8 is provided to lock the lower end of the outer wall 7a and position the cover 3 when the cover 3 is fixed to the box body 2. Have been.

The upper end of the peripheral wall 5 of the box body 2 (cover 2)
An annular projection 9 that presses almost the entire lower surface (one surface) of the annular sealing material 4 is provided on one of the joining portions of the annular sealing member 4 and the box body 1.
Is provided. As shown in FIG. 2, the projecting portion 9 has a central flat portion 9 that presses the central portion in the width direction of the lower surface of the sealing material 4.
a, and an inner inclined surface portion 9b and an outer inclined surface portion 9c that extend inclining from both ends of the central flat portion 9a, respectively, and are formed in a trapezoidal shape. The projection 9 further includes
An inner flat surface portion 9d and an outer flat surface portion 9e extending from the inner inclined surface portion 9b and the outer inclined surface portion 9c, respectively, are provided.

The upper end of the annular groove 6 of the cover 3 (the other of the joining portions) is formed as an annular concave portion 10 having a shape substantially matching the annular protrusion 9. That is, the recess 10
Are the central flat portion 9a of the annular protrusion 9 and the inner inclined surface portion 9b.
And a trapezoidal concave portion composed of an inner inclined surface portion 10b and an outer inclined surface portion 10c, and a central flat portion 10a opposed to the outer inclined surface portion 9c, and an inner planar portion 9d and an outer planar portion 9e of the annular projection 9. It has an inner flat portion 10d and an outer flat portion 10e facing each other.

The annular concave portion 10 of the cover 3 is
And the annular sealing material 4 shown in FIG. 4 is fixed.
The sealing material 4 is made of rubber, elastomer, rubber sponge, or the like. Further, the sealing material 4 includes the projection 9 and the recess 1.
0, the central seal portion 4a compressed between the central flat portions 9a, 10a, and the inner inclined surface portions 9b, 9b,
10b, the inner inclined seal portion 4b compressed between
And an outer inclined seal portion 4c compressed between the outer inclined surface portions 9c and 10c of the concave portion 10, and an inner circular seal having a circular cross section compressed between the protrusion 9 and the inner flat surface portions 9d and 10d of the concave portion 10. A portion 4d and an outer circular sealing portion 4e having a circular cross section compressed between the outer flat portions 9e and 10e of the protrusion 9 and the recess 10 are formed. The central seal portion 4a is thicker than the inner and outer inclined seal portions 4b and 4c and has a substantially uniform thickness.

In the waterproof structure of the box according to the present embodiment having the above structure, the peripheral wall 7 of the cover 3 is fitted to the peripheral wall 5 of the box body 2 and the upper opening of the box body 2 is closed with the cover 3. When the box body 2 is fixed with a fixture (not shown) (see FIG. 1), the annular projection 9 of the peripheral wall 5 presses substantially the entire lower surface of the annular sealing material 4 fixed to the annular concave portion 10 of the peripheral wall 7. (See FIG. 2). Therefore, the sealing area, that is, the contact area between the annular sealing member 4 and the annular projection 9 is significantly increased as compared with the conventional example shown in FIGS. Therefore, according to this example,
Due to the variation due to the tolerance of the peripheral wall 5 of the box body 2,
The waterproofing effect of the sealing material 4 does not decrease, and a high waterproofing effect can be obtained by improving the waterproofness.

Further, the upper end of the annular groove 6 of the peripheral wall 7 of the cover 3 is formed as an annular concave portion 10 having a shape substantially matching the annular projection 9 of the box main body 2, so that the upper opening of the box main body 2 is opened. Is closed by the cover 3, both surfaces of the sealing material 4 are pressed by the annular projection 9 and the annular recess 10 at three points indicated by arrows in FIG. That is, the central sealing portion 4a of the sealing material 4 is compressed between the central flat portions 9a, 10a of the projection 9 and the concave portion 10, and the inner inclined seal portion 4b is formed of the inner inclined surface portions 9b, 10b of the projecting portion 9 and the concave portion 10.
And the outer inclined seal portion 4c is
And between the outer inclined surface portions 9c, 10c of the concave portion 10. Therefore, a large sealing area can be obtained not only on the lower surface side of the sealing material 4 in contact with the projection 9 but also on the upper surface side of the sealing material 4 in contact with the concave portion 10, and the waterproof property is improved by that much. Moreover, since the sealing portion where the sealing material 4 and the projection 9 are in contact with each other and the sealing portion where the sealing material 4 and the concave portion 10 are in contact with each other are bent in a maze (trapezoidal shape), water is less likely to permeate. And the waterproofness is further improved.

In addition to the above-mentioned three locations, the inner and outer circular seal portions 4d and 4e of the sealing member 4 are also provided on the inner and outer flat portions 9d and 9e. Since the compression is performed by pressing each between, the waterproofness is further improved.

The center seal portion 4a of the seal member 4 is compressed between the central flat portions 9a and 10a of the protrusion 9 and the concave portion 10, so that a part of the center seal portion 4a is formed into the inner and outer inclined seal portions. It is pushed out to the 4b, 4c side, and further to the inner and outer circular seal portions 4d, 4e side. Therefore, the waterproofness of each of the inner and outer inclined seal portions 4b and 4c and the inner and outer circular seal portions 4d and 4e is improved.

When the upper opening of the box body 2 is closed by the cover 3, the annular groove 6 of the peripheral wall 7 of the cover 3 is fitted to the peripheral wall 5 so as to cover the inner and outer surfaces near the upper end of the peripheral wall 5 of the box body 2. And the recess 10 at the upper end of the annular groove 6 at the highest position of the fitting portion between the two peripheral walls 5 and 7.
Since the sealing material is compressed between the projection 9 at the upper end of the peripheral wall 5 of the box body 7, water hardly permeates into the sealing portion formed by the sealing material 4, and the waterproofness is further improved.

FIG. 5 shows a modification of the waterproof structure of the box according to the above example. In this modification, the peripheral wall 7 ′ of the cover 3 extends to near the lower end of the peripheral wall 5 of the box body 2, and covers the entire peripheral wall 5 of the box body 2.
Is fitted. Other configurations are the same as those in the above example. According to this modification, the fitting length between the peripheral wall 7 ′ of the cover 3 and the peripheral wall 5 of the box body 2 is increased, and water is less likely to permeate. That is, even if water enters between the peripheral wall 7 ′ and the peripheral wall 5 of the box body 2 from the lower end side of the peripheral wall 7 ′, since the height from the lower end of the peripheral wall 7 ′ to the position where the sealing material 4 is located is large, Water is less likely to reach the sealing material 4 through the gap between the peripheral walls 5, 7 '. Therefore, a very high waterproof effect can be obtained.

In each of the above examples, FIGS.
Instead of the above-mentioned annular sealing material 4, an annular sealing material 11 having a rectangular cross section as shown in FIG. 6 may be used. By using the sealing material 11, the manufacturing cost can be reduced. In the above example shown in FIG. 1 and the modification shown in FIG. 5, an annular projection 9 is provided on the box body 2 side and an annular recess 10 is provided on the cover 3 side.
7, an annular projection 9A having the same shape as the annular projection 9 is provided on the cover 3 side, and an annular recess 10 having the same shape as the annular recess 10 is provided on the box body 2 side, as shown in FIG.
A may be provided. In this case, the annular sealing member 4 shown in FIGS. 3 and 4 is used upside down as shown in FIGS. According to this modification, the same effects as those of the above examples can be obtained.

In the above example shown in FIG. 1 and the modification shown in FIG. 5, an annular projection 9B having a semicircular cross section is provided on the side of the box body 2 as shown in the modification shown in FIG. An annular concave portion 10B having a semicircular cross section may be provided on the third side. The annular protrusion 9B is provided with inner and outer flat portions 9d and 9e similar to the annular protrusion 9. In the modified example shown in FIG. 9, the annular sealing material 11 shown in FIG. 6 is used. According to this modification, similarly to the above example, the annular projection 9B provided on the box body 2 side.
Presses and compresses substantially the entirety of the sealing material 11 with the annular concave portion 10B provided on the cover 3 side, so that the sealing material 1 is deformed due to the tolerance of the peripheral wall 5 of the box body 2.
1, the waterproof effect is not reduced, and a high waterproof effect can be obtained by improving the waterproof property.

In the above example shown in FIG. 1 and the modified example shown in FIG. 5, like the modified example shown in FIG.
An annular concave portion 1 having a semicircular cross section on the box body 2 side and a trapezoidal cross section on the cover 3 side.
0C may be provided. Also in this modified example, similarly to the above example, the annular projection 9B provided on the box body 2 side presses and compresses almost the entire seal material 11 between the annular projection 9B provided on the cover 3 side and the annular concave portion 10C. Therefore, the sealing material 11 may vary due to the tolerance of the peripheral wall 5 of the box body 2 due to tolerance.
, The waterproof effect is not reduced, and a high waterproof effect can be obtained by improving the waterproof property.

Further, in the above example shown in FIG. 1, the peripheral wall 7 of the cover 3 is eliminated, and an annular projection 9 and an annular sealing material 4 provided at the upper end of the peripheral wall 5 of the box body 2 are provided on the outer periphery of the cover 3. An annular joint having the same shape as the annular concave portion 10 may be provided, and the seal member 4 may be compressed by the joint and the annular protrusion 9. With this configuration also, a high waterproof effect can be obtained by improving the waterproofness.

[0028]

As described above, according to the first aspect of the present invention, a high waterproof effect can be obtained by improving the waterproofness.

According to the second aspect of the present invention, in addition to the effect obtained by the first aspect of the present invention, the seal contacting not only the one surface side of the sealing material contacting the annular projection but also the annular recess. A large sealing area can be obtained on the other side of the material,
The waterproofness is improved by that much.

According to the third aspect of the present invention, in addition to the effects obtained by the first or second aspect of the present invention, the annular projections are formed of sealing materials at three places: a central plane portion and inner and outer inclined surfaces. Is pressed and compressed, so that the waterproofness is further improved. In addition, since the sealing portion where the sealing material and the annular projection contact each other is bent in a maze, water is more difficult to enter, and the waterproofness is further improved.

According to the fourth aspect of the present invention, in addition to the effects obtained by the third aspect of the present invention, the annular projection presses the sealing material not only at the three places but also at the inner and outer flat parts. Because of the compression, the waterproofness is further improved.

According to the invention of claim 5, claim 1,
In addition to the effects obtained by the invention according to 2, 3, or 4,
The upper end of the annular groove which is fitted to the peripheral wall of the box main body so that the annular groove of the peripheral wall of the cover covers at least the inner surface and the outer surface near the upper end of the peripheral wall of the box main body, and the highest position of the engagement between the two peripheral walls. Since the sealing material is compressed between the sealing member and the upper end of the peripheral wall of the box body, water hardly permeates into the sealing portion formed by the sealing material, and the waterproof property is further improved.

According to the sixth aspect of the invention, in addition to the effect obtained by the fifth aspect of the invention, the fitting length between the peripheral wall of the cover and the peripheral wall of the box body is increased, and water is accordingly reduced. It is difficult to penetrate.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a waterproof structure of a box according to an example of an embodiment of the present invention.

FIG. 2 is an enlarged partial cross-sectional view of a part of FIG.

FIG. 3 is a plan view of a sealing material used for the box shown in FIG. 1;

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a longitudinal sectional view showing a modification of the example shown in FIG. 1;

FIG. 6 is a sectional view similar to FIG. 4 showing a modified example of the sealing material shown in FIG. 4;

FIG. 7 is a diagram showing another modification of the example shown in FIG. 1;
FIG.

8 is a view showing a sealing material used in the modification shown in FIG. 7, and is a sectional view similar to FIG. 4;

9 is a diagram showing another modification of the example shown in FIG. 1; FIG.
FIG.

10 is a view showing still another modified example of the example shown in FIG. 1, and is a partial sectional view similar to FIG. 2;

FIG. 11 is an exploded perspective view showing a waterproof structure of a conventional box.

FIG. 12 is a partial cross-sectional view showing a structure of a seal portion in the conventional example shown in FIG.

[Explanation of symbols]

1 ………………………… Box 2 ………………………… Box body 3 ……………………… ……… Cover 4,11 ………………………………………………………………………………………………………………………………………. ……………………………………………………………………………………………………………………………………. ……………………………………………………………………… Central plane part 9b ………………………. Surface 9c ………………………………………………………………………………………………………………………………………………………………………… Inner plane 9e ………………. ……………………………………………………………………………….

Claims (6)

[Claims] When the upper opening of a box body is closed with a cover, the box is sealed with an annular sealing material interposed at a joint between the cover and the box body. A waterproof structure for a box, characterized in that an annular projection is provided on one of the joints of the above, for pressing substantially the entire surface of the annular sealing material. 2. The waterproof structure for a box according to claim 1, wherein the other of the joining portion between the cover and the box body is an annular recess having a shape substantially matching the annular projection. 3. The annular projection has a central flat portion for pressing a central portion in the width direction of one surface of the sealing material, and inner and outer inclined surface portions extending from both ends of the central flat portion so as to be inclined. The waterproof structure for a box according to claim 1 or 2, wherein 4. The waterproof structure for a box according to claim 3, wherein the annular projection further includes inner and outer flat portions extending from the inner and outer inclined surfaces, respectively. 5. A peripheral wall having an annular groove fitted to the peripheral wall so as to cover at least an inner surface and an outer surface near an upper end of the peripheral wall of the box main body, the upper end of the annular groove and the box. The waterproof structure for a box according to claim 1, 2, 3, or 4, wherein the upper end of the peripheral wall of the main body is the joining portion joined via the sealing material. 6. The peripheral wall of the cover extends to near the lower end of the peripheral wall of the box main body, and is fitted to the peripheral wall so as to cover the entire inner and outer surfaces of the peripheral wall of the box main body. 5. The waterproof structure of the box according to 5.