JPH08148856A - Sealing structure of box etc - Google Patents

Abstract

PURPOSE: To improve sealing structure of a box, etc., in a simple structure. CONSTITUTION: A packing 29 is integrally provided on the side wall outer peripheral surface 27 of an aperture part 3 of the first cover 1, next, an opposing inner wall 33 engaging with the side wall inner peripheral surface 31 of the upper two part 3 of the first cover 1 and another opposed outer wall 35 engaging with the side wall outer peripheral surface 27 are provided, next, a warp correcting rib 37 extending in the front and rear directions of the engagement is provided on the inner wall 33, finally, the gap between the warp correction rib 37 and the outer wall 35 is made smaller than the thickness between the side wall inner peripheral surface 31 of the aperture part 3 of the cover 1 and a packing outer end 29c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure for boxes used for electric connection boxes and the like.

[0002]

2. Description of the Related Art As a conventional seal structure for boxes, for example, an electric connection box, there is one shown in FIGS. 5 and 6 (see Japanese Utility Model Laid-Open No. 1-58983). The sealing structure of this electric junction box is performed by covering the opening 3 of the lower cover 1 which is the first cover with the opening 7 of the upper cover 5 which is the second cover via the packing 9. Further, the lower cover 1 is provided with a metal fitting lock 10a, and the upper cover 5 is provided with a lock receiver 10b. FIG. 6 shows a cross section of the seal structure between the openings 3 and 7 through the packing 9. As shown in FIG. 6, the opening 3 of the lower cover 1 is provided with a contact portion 11 for sealing. The inner wall 13 is formed in the opening 7 of the upper cover 5.
A packing accommodating portion 17 is provided by the outer wall 15 and the outer wall 15. The packing accommodating portion 17 accommodates the packing 9 made of, for example, an elastomer.

The opening 3 of the lower cover 1 having the above structure
The upper cover 5 is covered with the opening 7 and the contact portion 11 of the lower cover 1 is brought into contact with the packing 9. Then, the metal fitting lock 10a is engaged with the lock receiver 10b so that the lower cover 1
The upper cover 5 and the upper cover 5 are connected to each other to secure the sealing performance by the contact portion 11 and the packing 9.

[0004]

However, in the above structure, the contact portion 11 of the lower cover 1 must be continuously applied to the packing 9 of the upper cover 5 with a constant abutting force, and the metal fitting lock 10a is It is mandatory. Therefore, the structure is complicated by the need for the metal fitting lock 10a and the lock receiver 10b. Also hit part 1
The metal fitting lock 10a must also have a corresponding locking force because it must abut the packing 9 with a constant abutment force, and this locking force allows the operator to lock the metal fitting lock 10a with the lock receiver 10b. There is a risk that it will take time and effort to engage with and the assembly will be complicated. On the other hand, FIG. 7 shows a case where a CR packing 19 formed of chlorobrene rubber (CR) is used as the packing, and the separate CR packing 19 is housed in the packing housing portion 17. The CR packing 19 also has the same problems as those using the elastomer packing 9. 8 and 9
As described above, the CR packing 19 has the following problems. That is, when the CR packing 19 is accommodated in the packing accommodating portion 17 of the upper cover 5, the CR packing 19 is accommodated in the corner portion 21 of the packing accommodating portion 17.
However, due to the tension, the shape is not sufficiently aligned with the packing accommodating portion 17, and there is a possibility that the gap 23 is generated. Therefore, in the corner portion 21, the contact portion 11 is CR as shown in FIG.
There is a risk that the packing 19 cannot be crushed sufficiently and the sealing function becomes insufficient.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sealing structure for a box or the like which has a simple structure and is easy to assemble and can surely seal.

[0006]

In order to solve the above-mentioned problems, the invention of claim 1 is a box-type seal in which the opening of the first cover is covered with the opening of the second cover via packing. In the structure, the packing is integrally provided on the outer peripheral surface of the side wall of the opening of the first cover, and the opening is fitted to the inner peripheral surface of the side wall of the opening of the first cover. And an outer wall that is fitted to and faces the inner wall and the outer peripheral surface of the side wall that face each other, and a warp correction rib that extends in the front-rear direction of the fitting is provided on the inner wall. And the outer wall are smaller than the thickness of the inner peripheral surface of the side wall of the opening of the first cover and the outer end of the packing.

According to a second aspect of the present invention, in the box-like sealing structure according to the first aspect, a guide surface for abutting the opening of the first cover to guide the fitting is provided on the warp correction rib. It is characterized by being provided.

A third aspect of the present invention is the box-like seal structure according to the first or second aspect, wherein the packing is provided so as to cover the protrusion formed on the outer peripheral surface of the side wall. It is characterized by

According to a fourth aspect of the present invention, there is provided the box-like sealing structure according to the third aspect, wherein the protrusion has a cross section that is enlarged in a direction away from the outer peripheral surface of the side wall. The invention according to claim 5 is the sealing structure for a box according to claim 1 or 2, wherein the outer wall 35 is longer than the inner wall 33.

[0010]

According to the first aspect of the present invention, when the opening 3 of the first cover 1 is covered with the opening 7 of the second cover 5, the side wall of the opening 3 of the first cover 1 becomes the second side. Enter the inner and outer walls of the cover 5. As a result, the warp of the side wall of the opening 3 of the first cover 1 is forcibly corrected by the warp correction rib of the second cover 5. At the same time, the gap between the edge in the height direction with respect to the inner wall of the warpage straightening rib and the outer wall is formed smaller than the thickness between the inner peripheral surface of the side wall of the opening 3 of the first cover 1 and the outer end of the packing. The outer end is brought into pressure contact with the inner surface of the outer wall of the second cover 5 to perform a sealing function.

According to the second aspect of the invention, in addition to the operation of the first aspect of the invention, the second cover 5 is provided in the opening 3 of the first cover 1.
When the opening 7 of the first cover 1 is covered, the second opening 3 of the first cover 1 is covered.
The guide surface provided on the warp correction rib on the cover side of the first cover 1 is abutted and guided, and by fitting both covers with a predetermined pressure, the side wall of the opening 3 of the first cover 1 becomes the second cover 5. It fits easily between the inner and outer walls of the opening 7. Therefore, the packing can be pressed against the inner peripheral surface of the outer wall on the second cover side.

According to the third aspect of the invention, in addition to the action of the first or second aspect of the invention, the packing is provided so as to cover the protrusion formed on the outer peripheral surface of the side wall of the opening 3 of the first cover 1. It can be installed firmly.

According to the invention of claim 4, in addition to the effect of the invention of claim 3, the packing can be more firmly attached by the protrusion having the enlarged cross section in the direction away from the outer peripheral surface of the side wall.

According to the invention of claim 5, in addition to the operation of the invention of claim 1 or 2, when the opening 3 of the first cover 1 is covered with the opening 7 of the second cover 5, first the first cover 1 is formed. The packing 29 of the first opening 3 hits the outer wall, then the packing 29 is crushed by the outer wall 35, and the packing 29 moves along the inner surface of the outer wall 35. After this movement, the first cover 1
The side walls 25 of the second cover 5 are further moved while the warpage is corrected by the warpage correction ribs 37.
It is inserted between 5. Therefore, the packing 29 is first crushed, and then the side wall 25 of the first cover 5 is inserted between the inner and outer walls 33, 35 of the second cover 5.

[0015]

Embodiments of the present invention will be described below. The same components as those in FIGS. 5 and 6 are designated by the same reference numerals for the description, and the duplicated description will be omitted.

The boxes in this embodiment are also used for an electric connection box similar to that shown in FIG. 5, for example. Figure 1 shows the first
3 is an enlarged cross-sectional view of a main part in a state in which the opening 3 of the lower cover 1 which is the cover of FIG.
As shown in FIG. 1, packing 29 is integrally provided on the outer peripheral surface 27 of the side wall 25 of the opening 3 of the lower cover 1.

In the opening 7 of the upper cover 5, an inner wall 33 fitted and opposed to the inner peripheral surface 31 of the side wall 25 in the opening 3 of the lower cover 1 and an outer wall 35 fitted and opposed to the outer peripheral surface 27. Is provided. The outer wall 35 is the inner wall 33
It is formed slightly longer than the above, and a slope 35a is formed in the lower part. The inner wall 33 is fitted in the front-back direction (see FIG. 1).
A warp correction rib 37 extending in the vertical direction) is provided. A guide surface 39 formed by a slope is provided at the lower end of the warp correction rib 37. Inner wall 33 of the sled straightening rib 37
Edge portion 37a in the height direction with respect to the inner wall surface 35b of the outer wall 35
The distance H between the side wall 25 and the opening 25 of the lower cover 1 is
The inner peripheral surface 31 and the outer end of the packing 29 (the outer end in the free packing state) are formed to have a smaller thickness.
This point will be described later.

The packing 29 of the lower cover 1 is provided all around the outer peripheral surface 27 of the side wall 25 as shown in FIG. The packing 29 is made of elastomer. As the elastomer used for the packing 29, urethane-based, styrene-based, olefin-based, ester-based, amide-based, or the like having excellent heat-curing resistance is used. To fix the packing 29 to the side wall 25, the lower cover 1 is resin-molded by an upper mold and a lower mold (not shown) by, for example, a conneback method, and then an elastomer is placed in a gap formed by sliding a part of the lower mold. By injecting, double molding can be performed with the same mold, and the outer surface of the side wall 25 can be fixed by welding. Further, the elastomer molding does not require a post-treatment step such as a rubber packing due to a vortex flow, which significantly improves the productivity. A sectional view of the side wall 25 at the packing 29 portion is as shown in FIG. That is, the outer peripheral surface 27 of the side wall 25
The protrusion 41 is provided on the. The protrusions 41 may be provided along the outer peripheral surface 27 of the side wall 25 at predetermined intervals or may be provided continuously. The cross section of the protrusion 41 is the side wall 2
5 has an enlarged cross section in the direction away from the outer peripheral surface 27. Therefore, the packing 29 can be firmly attached to the side wall 25. The packing 29 is provided so as to cover the protrusion 41. The cross section of the packing 29 is composed of upper and lower slopes 29a and 29b, and the packing outer end 29c.
Is the top of the triangular cross section. The gap H is smaller than the thickness h between the inner peripheral surface 31 of the side wall 25 and the packing outer end 29c.

When fitting the lower cover 1 and the upper cover 5, first, the opening 7 of the upper cover 5 is aligned with the opening 3 of the lower cover 1 as shown in FIG. As a result, the side wall 25 of the lower cover 1 contacts the guide surface 39 on the upper cover 5 side, and the packing outer end 29c of the packing 29 contacts the inner peripheral surface of the outer wall 35 on the upper cover 5 side. At this time, due to the existence of the inclined surface 35a, the packing outer end 29c is smoothly guided to the inner surface 35b of the outer wall 35. When the lower cover 1 and the upper cover 5 are fitted together with a predetermined force, the side wall 25 on the lower cover 1 side moves between the inner and outer walls 13, 15 on the upper cover 5 side while being guided by the guide surface 39. As a result, the packing 29 slides while contacting the inner surface 35b of the outer wall 35 on the upper cover 5 side.
Next, the packing 29 is crushed by the outer wall 35, and the packing 29 moves along the inner surface of the outer wall 35. After this movement, the side wall 25 of the lower cover 1 is further moved while the warp is corrected by the warp correction rib 37, and is inserted between the inner and outer walls 33, 35 of the upper cover 5. Therefore, the packing 29 is first crushed and then the side wall 25 of the lower cover is inserted between the inner and outer walls 33 and 35 of the upper cover 5. In this way, since the outer wall 35 is longer than the inner wall 33, when the lower cover 1 is covered with the upper cover 5, the packing 29 is first crushed and then the side wall 25 is inserted, so that the insertion force can be reduced. . That is, the change in the force at the time of insertion is such that the force α for crushing the packing 29 first appears, and after this force α shows a peak, the force when the packing 29 slides along the inner wall of the outer wall 35. β
Descend to. After that, the sliding force γ between the warp correction rib 37 and the side wall 25 increases with respect to the force β. On the other hand, when the outer wall 35 is not longer than the inner wall 33, the force γ first appears and then the packing crushing force α appears, so the peak value is (γ +
α). Therefore, the peak value α of the embodiment of the present invention
Is lower than when the outer wall 35 is not long. When the side wall 25 is fitted between the inner and outer walls 33, 35, the warpage S of the side wall 25 is corrected by the relationship of the dimension difference h-H, and the packing 29 is crushed with a predetermined pressure as shown in FIG. Demonstrate the sealing function.

In this way, the packing 2 can be obtained by simply fitting the lower cover 1 and the upper cover 5 with each other with a predetermined pressure.
Since 9 contacts the outer wall 35 with a constant pressure, the sealing function can be achieved by simple assembly. Further, the packing 29 is pressed against the outer wall 35 while correcting the warp of the side wall 25 by the warp correction rib 37.
The sealing function of can be reliably achieved. further,
The insertion force of the side wall 25 between the inner and outer walls 33, 35 is reduced,
The insertion work becomes easy. Further, the metal fitting lock as described above is not necessarily required to exert the sealing function of the packing 29, and the structure is simple and the assembling work becomes extremely easy.

[0021]

As is apparent from the above, according to the first aspect of the present invention, the opening 3 of the first cover 1 is provided in the second cover 5.
Of the first cover 1 and the side wall of the opening 3 of the first cover 1 is fitted between the inner and outer walls of the opening 7 of the second cover 5 so that the packing abuts on the inner surface of the outer wall with a constant pressure. Can be made. Moreover, the warp correction rib corrects the warp of the side wall of the opening 3 of the first cover 1. Therefore, the packing properly presses against the inner surface of the outer wall, and a sufficient sealing function can be achieved. Moreover, a metal fitting lock or the like is not necessarily required to achieve the sealing function, and the structure is simple and the assembly is extremely easy.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the opening 3 of the first cover 1 can be easily guided between the inner and outer walls of the opening 7 of the second cover 5 by the guide surface. Therefore, the assembling work can be performed more easily.

According to the third aspect of the invention, in addition to the effect of the first or second aspect of the invention, the packing can be firmly attached due to the presence of the protrusion.

According to the invention of claim 4, in addition to the effect of the invention of claim 3, the packing can be more firmly attached by the enlarged cross-sectional shape of the protrusion.

According to the invention of claim 5, in addition to the effect of the invention of claim 1 or 2, in addition to making the outer wall 35 longer than the inner wall 33, the opening 3 of the first cover 1 becomes larger than that of the second cover 5. The opening 7 can be easily guided between the inner and outer walls with a low insertion force, and the assembling work can be performed more easily.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part according to an embodiment of the present invention.

FIG. 2 is a perspective view of a lower cover.

FIG. 3 is a sectional view of a main part of a lower cover.

FIG. 4 is an operation explanatory view.

FIG. 5 is an exploded perspective view of a conventional electrical junction box.

FIG. 6 is a sectional view of a main part.

FIG. 7 is a cross-sectional view of a main part according to another conventional example.

FIG. 8 is a plan view of relevant parts for explaining a gap between a packing accommodating portion and a CR packing.

9 is a sectional view taken along line IX-IX of FIG.

[Explanation of symbols]

 1 Lower cover (first cover) 3 Opening 5 Upper cover (second cover) 7 Opening 25 Side wall 27 Outer peripheral surface 29 Packing 31 Inner peripheral surface 33 Inner wall 35 Outer wall 37 Sledding correction rib 39 Guide surface 41 Protrusion

Claims (5)

[Claims] 1. A box-like sealing structure in which an opening of a second cover is covered with an opening of a first cover via a packing, wherein the outer peripheral surface of a side wall of the opening of the first cover is formed. A packing is integrally provided, and an inner wall fitted to and opposed to a side wall inner peripheral surface of the opening of the first cover and an outer wall fitted to and opposed to a side wall outer peripheral surface of the opening of the second cover. A warp correction rib extending in the front-rear direction of the fitting is provided on the inner wall, and a distance between an edge portion in the height direction with respect to the inner wall of the warp correction rib and an outer wall is defined by a side wall of the opening of the first cover. A box-like sealing structure characterized by being made thinner than the thickness between the inner peripheral surface and the outer end of the packing. 2. The box-like seal structure according to claim 1, wherein the warp-correcting rib is provided with a guide surface that abuts an opening of the first cover to guide the fitting. Characteristic box type seal structure. 3. The box-like seal structure according to claim 1, wherein the packing is provided so as to cover a protrusion formed on the outer peripheral surface of the side wall. Sealing structure for boxes. 4. The box-like seal structure according to claim 3, wherein the protrusion has an enlarged cross section in a direction away from the side wall outer peripheral surface. 5. The box seal structure according to claim 1, wherein the outer wall is longer than the inner wall.