JP2001189575A - Seal structure of water-proof case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure water-tightness between a lower case and an upper case constituting a water-proof case when the lower case and the upper case are fit to each other without deteriorating fitting operativity between both the cases. SOLUTION: A raised opening peripheral edge 9 is provided to the circumference of a lower case 1, and a water proof packing fitting groove 17 consisting of a pair of side walls 14A, 14B whereto the edge 9 is loosely fit, a top wall 15 formed between both the side walls and a recessed groove 16 formed in a central part of the top wall 15 is provided to an inner side of an upper case. A protrusion 20 which is closely fitted into the recessed groove 16 is formed, and an opening peripheral fitting groove 22 tapered to have an opening width which is larger than the thickness width of the edge 9 of the lower case 1 and to be narrow gradually toward the interior of a water-proof packing is formed in a central part of the lower surface 21.

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 use in a waterproof case for housing electronic equipment installed in a place which is susceptible to rainwater or moisture during car washing, for example, outside a vehicle compartment. The present invention relates to a sealing structure of a waterproof case which can ensure watertightness between the lower case and the upper case without interfering with the workability of fitting the lower case and the upper case constituting the case and when the lower case and the upper case are fitted. .

[0002]

2. Description of the Related Art The structure of a general waterproof case such as an electronic device storage case or an electrical connector storage case provided outside a vehicle compartment is composed of a lower case and an upper case fitted to an opening edge of the lower case. A waterproof sealing material is interposed between the lower case and the upper case, so that the lower case and the upper case are fitted and held in a waterproof manner.

As a conventional example of a waterproof seal structure used for such a waterproof case, for example, Japanese Utility Model Laid-Open No. 1-58983 is disclosed.
Is proposed in Japanese Patent Publication No. This conventional example is shown in FIG.
As shown in the figure, an elastomer or rubber packing (d) is fixed to a butt fitting portion (c) of the waterproof cover (b) fitted to the case body (a), and this packing (d)
And an engaging projection (e) provided on the case body (a).
And a waterproof seal is performed by the elastic pressure.

[0004]

However, the sealing surface between the case body (a) and the packing (d) in the above-mentioned conventional seal structure has an engaging projection (e) formed on the case body (a). ), Only the width of the protruding edge is insufficient, so that the sealing performance is lacking. For example, when high-pressure water is received during car washing or the like, it cannot withstand the high-pressure water. In order to prevent such intrusion of pressurized water, the engaging projection (e) and the packing (d) are used.
It is necessary to apply a strong pressing force between the case body and the case, and therefore, it is necessary to attach a locking metal fitting to both the case body (a) and the waterproof cover (b). There was a problem that an increase and an increase in cost occurred.

The present invention has been made in view of such a conventional problem, and is a waterproof case composed of a lower case and an upper case, wherein a waterproof packing is interposed between the lower case and the upper case. A first object of a waterproof case having a waterproof structure is to increase and maintain a contact pressure area between the lower case and the waterproof packing and a contact pressure area between the upper case and the waterproof packing to increase waterproofness of the waterproof case. .

Further, according to the present invention, when the lower case and the upper case are attached to and fitted to each other, the attachment and fitting of the two cases can be performed smoothly and easily.
A second object is to provide a waterproof case that ensures waterproofness between the two cases after the attached fitting.

[0007]

Means for Solving the Problems The first object and the second object are described.
According to a first aspect of the present invention, there is provided a seal structure of a waterproof case in which a lower case and an upper case are fitted via a waterproof packing, wherein the periphery of the lower case has an opening edge which stands up. On the inner side of the upper case, there are a pair of side walls in which the edges of the opening are loosely fitted, and a concave groove formed in the center of the top wall as well as the top wall formed between the two side walls. The waterproof packing has a waterproof packing fitting groove, and a cross-sectional shape of the waterproof packing fitted into the waterproof packing fitting groove is symmetrically positioned with the pair of side surfaces facing the pair of side walls and the top surface corresponding to the top wall. A lower end of the lower case, and a lower end of the lower case having a width larger than a thickness width of an opening edge of the lower case. Opening width,
It is characterized in that it is a seal structure of a waterproof case in which an opening edge fitting groove formed in a taper whose interval gradually narrows toward the inside of the waterproof packing is formed.

According to a second aspect of the present invention, in addition to the first aspect, each corner formed by the upper surface of the waterproof packing and both side surfaces of the ridge protruding from the center of the upper surface is formed by a rounded corner. In addition, it is characterized in that it is a sealing structure of a waterproof case in which an inducing taper is formed at the corner of the tip of the ridge.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, the overall configuration of the waterproof case will be described with reference to FIG. 1. Reference numeral 1 denotes a lower case having a bottom wall 2 and a side wall 3 standing up around the bottom wall 1. A wire harness 4 is provided in the lower case 1 from inside the lower case 1 to outside thereof. A wire harness outlet 5 for drawing out is formed. Reference numeral 6 denotes an electronic device module housed and fixed in the lower case 1, and the wire harness 4 is connected to the electronic device module 6 via a connector 7.

Reference numeral 8 denotes an annular waterproof packing formed of an elastic material such as rubber and engaged with an opening edge 9 of the side wall 3 formed on the lower case 1. The upper case 10 is attached in a waterproof state via the waterproof packing 8 described above. A waterproof grommet 13 is fitted into the wire harness 4, and a filler is injected and solidified into a sleeve 11 integrally formed with the waterproof grommet 13, and a vertical opening edge of a wire harness outlet 5 formed in the lower case is formed. 12 and upper case 1
The area between 0 and 0 is watertightly closed via the waterproof grommet 13.

Therefore, the waterproof packing 8 is attached to the lower case 1.
Specifically, the thickness of the opening edge 9 formed in the lower case 1 is set to a width (W). Also, inside the upper case 10, a pair of side walls 14A and 14B into which the opening edges of the lower case 1 are loosely fitted, a top wall 15 formed between the two side walls, and a central portion of the top wall 15 The fitting groove 17 is formed continuously in the circumferential direction of the upper case 10 in the waterproof packing composed of the concave groove 16 formed in the upper case 10.

The cross-sectional shape of the waterproof packing 8 fitted (fitted) into the waterproof packing fitting groove 17 is such that each of the side walls 14A. 14
B, an upper surface 19 facing the top wall 15 of the upper case 10,
9, a projecting ridge 20 which is fitted into a concave groove 16 formed in the upper case 10 and a central portion of a lower surface 21 of the waterproof packing 8, and which is formed in the center of the lower case 1. An opening edge fitting groove 22 into which the opening edge 9 formed in the hole is fitted is formed.

The opening groove width (R) of the opening edge fitting groove 22 formed in the waterproof packing 8 is set to be larger than the thickness width (W) of the opening edge 9 and the opening edge fitting groove. 22
The tapered groove is formed such that its groove width becomes substantially equal to the thickness width of the opening side edge 9 toward the inside. A corner formed between the upper surface 19 formed on the waterproof packing 8 and both side surfaces 20A of the ridge 20 is formed with a corner radius 23, and the tip corner of the ridge 20 has the protrusion. The ridge 20 is formed in an inducing taper 24 for facilitating fitting into the concave groove 16.

Next, the waterproof action when the upper case 10 is attached to the lower case 1 via the waterproof packing 8 will be described. First, the waterproof packing 8 is fitted into the waterproof packing fitting groove 17 formed in the circumferential direction inside the upper case 10. When the waterproof packing is fitted, the ridges 20 formed on the waterproof packing 8 are fitted. The waterproof packing fitting groove 1 formed in the upper case 10
7 is tightly fitted into the groove 16. At this time, since the lug taper 24 is formed at the corner of the tip of the ridge 20, it is easy to press-fit the ridge 20 into the groove 16 of the upper case 10.

After the waterproof gasket 8 is fitted and held (set) in the waterproof gasket fitting groove 17 of the upper case 10, the upper case 10 is put on the lower case 1. The waterproof gasket 8 fitted and held in the upper case 10 is formed with a flared opening margin fitting groove 22 due to the taper, so that the upper case 10 is covered on the lower case 1. During operation, the opening edge 9 formed in the lower case 1 can be smoothly fitted into the opening edge fitting groove 22 of the waterproof packing 8 (see FIG. 5).

After the opening edge 9 of the lower case 1 is fitted into the opening edge fitting groove 22 of the waterproof packing 8, if the lower case 1 and the upper case 10 are further fitted, the fitting is enhanced.
At the tip of the opening edge 9 formed in the lower case 1, the waterproof packing 8 is fitted with the waterproof packing fitting groove 1 of the upper case 10.
7, and the corner 25, which is the intersection of the top wall 15 of the upper case 10 and the side surface of the concave groove 16,
Both the rounded corners 23 formed on the waterproof packing 8 are bitten, and the opening margin fitting grooves 22 formed on the waterproof packing 8 are elastically deformed (see FIG. 6) in a direction to reduce the groove width. The tapered surfaces on both sides of the opening margin fitting groove 22 are pressed against the both sides of the opening periphery 9.

As described above, when the upper case 10 is attached to and fitted to the lower case 1, the two corners 25 formed on the upper case 10 are respectively formed on the waterproof packing 8. By being bitten into the inside, the waterproof sealing property between the upper case 10 and the waterproof packing 8 can be secured. In addition, its waterproof packing 8
Since the groove surface of the opening edge fitting groove 22 formed on the inner peripheral surface of the opening edge 9 is in contact with the inner and outer side surfaces of the opening edge 9 and the end surfaces thereof, the waterproof sealing property between the lower case 1 and the waterproof packing 8 can be secured. In addition, the waterproofness between the lower case 1 and the upper case 10 is improved.

In the embodiment shown in FIG. 7, a ridge 2 having a substantially semicircular cross section is formed on an end face of an opening edge 9 formed in a lower case.
6 was continuously formed. In this case, when the opening edge 9 is pressed into the opening edge fitting groove 22 of the waterproof packing 8, the ridge 26 is bitten into the waterproof packing 8, and the waterproof seal between the opening edge 9 and the waterproof packing 8 is formed. Properties can be further enhanced.

[0019]

As described above, according to the waterproof case seal structure of the present invention, when the lower case and the upper case are attached and fitted, the waterproof packing is placed at a desired position between the lower case and the upper case. The lower case and the upper case can be smoothly fitted because the waterproof packing is formed with an opening edge fitting groove that opens in a tapered shape without being displaced.

Further, according to the present invention, the sealing property between the lower case and the waterproof packing and the sealing property between the upper case and the waterproof packing are enhanced, and the waterproof case having a superior waterproof sealing property as compared with the conventional waterproof case structure is provided. Provision is possible.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a waterproof case according to the present invention.

FIG. 2 is a sectional view of a main part of an upper case according to the present invention.

FIG. 3 is a sectional view of a waterproof packing according to the present invention.

FIG. 4 is an explanatory sectional view of a main part of a waterproof case according to the present invention.

FIG. 5 is an explanatory diagram showing a state before the upper case and the lower case are fitted to each other.

FIG. 6 is an explanatory view after the upper case and the lower case are fitted.

FIG. 7 is an explanatory cross-sectional view of a main part of a waterproof case showing another embodiment of the present invention.

FIG. 8 is an explanatory view showing a seal structure in a conventional waterproof case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lower case 2 ... Bottom wall 3 ... Side wall 4 ... Wire harness 5 ... Wire harness outlet 6 ... Electronic equipment module 7 ... Connector 8 ... Waterproof packing 9 ... Opening edge 10 ... Upper case 11 ... Sleeve 12 ... Vertical opening edge 13 ... waterproof grommet 14A, 14B ... side wall 15 ... top wall 16 ... concave groove 17 ... waterproof packing fitting groove 18A, 18B ... side surface 19 ... upper surface 20 ... ridge 21 ... lower surface 22 ... opening edge fitting groove 23 ... square round 24 ... Invitation taper 25 ... corner 26 ... ridge

Claims (2)

[Claims] 1. A lower case (1) and an upper case (1).
In the seal structure of a waterproof case in which the lower case (1) is fitted through a waterproof packing (8), the lower case (1) has an opening edge (9) standing around the lower case (1), and inside the upper case, A pair of side walls (14A) and (14B) into which the opening edge (9) is loosely fitted, and a ceiling wall (15) formed between the two side walls, and a center part of the ceiling wall (15). Groove (1) formed by
7), and the cross-sectional shape of the waterproof packing (8) to be fitted into the waterproof packing fitting groove (17) has a pair of side faces (18) facing the pair of side walls (14A) and (14B).
A), (18B) and the upper surface (19) corresponding to the top wall (15) and the lower surface (2) symmetrically positioned with the upper surface (19).
1), and a ridge (20) is formed in the center of the upper surface (19) so as to be closely fitted in the concave groove (16), and the ridge (20) is formed in the center of the lower surface (21). An opening edge fitting groove (22) having an opening width larger than the thickness width of the opening edge (9) of the lower case (1), and having a taper whose interval gradually decreases toward the inside of the waterproof packing. A waterproof case seal structure, characterized by forming a seal. 2. An upper surface (19) of a waterproof packing (8);
Both sides (2) of the ridge (20) protruding at the center of the upper surface
A corner formed of a corner (0A) and (20B) is formed with a corner radius (23), and an inducing taper (24) is formed at a tip corner of the ridge (20). 2. The seal structure for a waterproof case according to 1.