JP2571616Y2 - Case seal structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for a case such as an electric junction box or a sensor, and more particularly to a sealing structure for a case capable of more reliably waterproofing and sealing.

[0002]

2. Description of the Related Art FIG. 7 is an exploded perspective view showing a conventional case sealing structure described in Japanese Utility Model Laid-Open No. 1-58983.
FIG. 8 is a longitudinal sectional view of a main part showing the assembled state. In these drawings, reference numeral 25 denotes a synthetic resin case body accommodating the connector portion 26; 27, a synthetic resin cover joined to the case body 25 by locking means 28, 29;
Denotes a rubber waterproof packing provided between the cover 27 and the case body 25.

[0003] As shown in FIG. 8, the packing 30 has a rectangular cross section and is fitted into a peripheral portion 31 of the cover 27.
By being pressed against and tightly attached to the opening-side end surface 32 of the case body 25, intrusion of water from the outside is prevented.

[0004]

However, in the conventional case sealing structure described above, when the case body 25 and the cover 27 are assembled, the case body 25 is attached to the packing 30.
Even if the opening side end surface 32 is pressed, the packing 30
Only the pressing force (vertical direction in FIG. 8) of the opening side end face 32 in the joining direction acts, and the pressing force in the direction orthogonal to the joining direction (FIG. 8).
(Lateral direction) hardly acts.

For this reason, the adhesion between the peripheral portion 31 of the cover 27 and the packing 30 is reduced. In particular, when the circumferential length of the packing 30 is long, unevenness occurs in the pressing force of the opening side end face 32,
There is a problem that the sealing performance between the case body 25 and the cover 27 is deteriorated.

[0006] The present invention has been made in view of the above problems, and can improve the adhesion of the packing.
It is an object of the present invention to provide a case sealing structure that can exhibit good sealing performance even when the overall length of the packing is long.

[0007]

In order to achieve the above object, a case seal structure according to the present invention is a case seal structure in which a case body and a cover are joined via a packing. And / or a peripheral groove having a constant groove width is provided on the joint surface with the cover, and a tapered fitting ridge is press-fitted into the peripheral groove of the packing around the case body and / or the cover. And a pressing surface corresponding to a side surface of the packing is formed, and preferably, a groove width of a peripheral groove of the packing is set to a value of a tip of a fitting ridge of the case body and / or the cover. The packing has substantially the same width, and further, an engagement hole is formed in the packing on the side opposite to the pressing contact surface of the case body and / or the cover, and a projection inserted into the engagement hole is formed. ,Before A structure projecting from the case body and / or the cover.

[0008]

According to the case seal structure of the present invention having such a configuration, when the case body and the cover are assembled, the tapered fitting ridge provided on the case body and / or the cover is formed. The packing is press-fitted into a circumferential groove having a constant groove width, and the packing is pressed in a joining direction of the fitting ridge and is spread in a direction orthogonal to the joining direction. That is, a pressing force acts on the packing in a joining direction of the fitting protrusions and in a direction orthogonal to the joining direction. Thereby, almost the entire circumference of the packing is positively pressed against the case body and the cover, and firmly adheres to each other, so that a good sealing effect can be obtained.

Also, if the fitting ridge is pressed into the circumferential groove even a little, the packing expands and the sealing force works, so that even if the entire length of the packing is long, good sealing properties can be exhibited. it can.

Further, a predetermined engaging hole is formed in the packing, and a projection inserted into the engaging hole is formed so as to protrude from the case body and / or the cover. It can be easily performed, and the packing is limited in its expansion in the joining direction of the fitting ridge, and in a direction orthogonal to the joining direction.
It is possible to further improve the adhesion of the packing when assembling the case body and the cover.

In addition, when the width of the peripheral groove of the packing is substantially equal to the width of the tip of the fitting ridge of the case body and / or the cover, the fitting ridge is It is easy to enter the circumferential groove of the packing, and the packing can be sufficiently expanded in the direction orthogonal to the joining direction of the fitting ridges.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a case sealing structure according to the present invention; FIG. 1 is a side view showing a case with a built-in airbag sensor of an automobile in which the case sealing structure of the present invention is implemented. FIG. 2 is a front view as viewed from an arrow A in FIG. 1 with a cover removed, and FIG. 3 is a front view showing the cover (inner side).

In FIG. 1, a case 1 is composed of a synthetic resin case main body 2 having an open upper part and a cover 3, and a sensor 5 held by a bracket 6 is housed in the case main body 2. I have. The sensor 5 is sealed and fixed in the case main body 2 by an epoxy resin agent 8 injected and filled from a bracket hole 7, and the sensor 5 is provided with a connector terminal 4. The cover 3 is fixed by the epoxy resin agent 8 in a state where the cover 3 is joined to the case main body 2.

Therefore, the joint 9 between the case body 2 and the cover 3 needs to be waterproof and hermetically sealed with respect to the injected resin agent 8. For this purpose, the present embodiment employs the following seal structure.

FIGS. 4, 5 and 6 are enlarged views of a main part showing the seal structure of the present embodiment. In these drawings, the joint surface 10 of the case body 2 has tapered surfaces 11a,
A fitting ridge 11 having a peripheral groove 12 having a constant groove width d corresponding to the fitting ridge 11 is provided on the cover 3 for the case body 2. is there.

At the end of the peripheral wall 14 of the cover 3, a joining surface 15 for the packing 13 and an outer edge 16 projecting perpendicular to the joining surface 15 are formed.
A plurality of packing fixing projections 17 are provided adjacent to 5 (see FIG. 3).

The packing 13 has an abutting surface 18 for the joining surface 15, a contact surface (side surface) 19 for the inner surface (pressing surface) 16 a of the outer edge 16 orthogonal to the abutting surface 18, and the projection 17. And an engaging hole 20 with respect to. The peripheral groove 12 is formed on the contact surface 21 of the case main body 2 facing the joint surface 10 near the contact surface 19. It is set to be as small as the width D. Such packing 13
For example, it is formed of oil-impregnated rubber or the like.

According to the case sealing structure of the present embodiment having the above-described structure, as shown in FIG.
When the cover 3 is assembled, the tapered fitting ridge 11 provided on the case body 2 is press-fitted into the circumferential groove 12 having a constant groove width d of the packing 13, and the packing 13 is joined in the joining direction ( While being pressed in the directions indicated by arrows a and b), it is spread in the direction perpendicular to the joining direction (direction indicated by arrows b and b). That is, a pressing force acts on the packing 13 in the joining direction of the fitting protrusion 11 and in a direction orthogonal to the joining direction.

As a result, the contact surfaces 18 and 21 on the front and back sides of the packing 13 and the contact surfaces 19 on the sides are joined to the joint surfaces 15 and 10 of the cover 3 and the case body 2 and the inner surface 1 of the outer edge of the cover 3.
6a is positively pressed against and tightly adheres, and good sealing properties are exhibited.

Also, if the fitting ridge 11 is pressed into the circumferential groove 12 even a little, the packing 13 expands and the sealing force works, so that even if the entire length of the packing 13 is long, good sealing performance is exhibited. be able to

Further, a predetermined engaging hole 20 is formed in the packing 13.
The packing 13 can be easily mounted by projecting the projection 17 to be inserted into the engagement hole 20 from the cover 3, and the packing 13 can be easily fitted with the fitting ridge 1.
Since the expansion is restricted in the joining direction of 1 and the direction orthogonal to the joining direction, the adhesion of the packing 13 can be further improved.

In addition, the groove width d of the peripheral groove 12 of the packing 13 is set to be substantially the same as the width D of the leading end of the fitting ridge 11, so that the fitting ridge 11 It is easy to enter, and the packing 13 can be sufficiently expanded in the direction orthogonal to the joining direction of the fitting ridges 11.

The case seal structure of the present invention is not limited to the above-described embodiment. For example, the tapered fitting ridge 11 having the tapered surface 11a may be provided on the cover 3 side, or may be provided on both the case body 2 and the cover 3. Further, the seal structure of the case of the present invention is not limited to the case 1 with a built-in sensor, and can be applied to the case of the electric junction box as shown in the conventional example.

[0024]

As described above, according to the case sealing structure of the present invention, the width of the fitting ridge protruding from the case body and / or the cover is made larger than the width of the circumferential groove provided on the packing. Due to this, at the time of assembling the case main body and the cover, pressing force acts on the packing in two directions, a joining direction of the fitting ridge and a direction orthogonal to the joining direction, and the packing is substantially The entire circumference can be positively pressed against the case body and the cover, and the adhesion of the packing at the time of assembling the case body and the cover can be improved. In addition, since a predetermined engagement hole is formed in the packing and a projection inserted into the engagement hole is formed to protrude from the case body and / or the cover, the packing can be easily attached. Further, since the packing is restricted in its expansion in the joining direction of the fitting ridge, and in a direction orthogonal to the joining direction, the packing of the case body and the cover at the time of assembling the cover can be performed. The adhesion can be further improved. In addition, when the groove width of the peripheral groove of the packing is substantially the same as the width of the tip of the fitting ridge, the fitting ridge easily enters the peripheral groove, and The packing can be sufficiently expanded in a direction perpendicular to the joining direction of the fitting ridges. As described above, since the adhesion of the packing is improved and a good sealing effect can be obtained, even when the entire length of the packing is long, it is possible to surely prevent water from entering or leakage of the filler in the case. And the packing can be easily attached.

[Brief description of the drawings]

FIG. 1 is a cutaway side view showing a main part of an airbag sensor built-in case to which a case sealing structure according to the present invention is applied.

FIG. 2 is a front view as viewed in the direction of arrow A in FIG. 1 with the cover removed.

FIG. 3 is a front view showing a cover (inner side surface).

FIG. 4 is an exploded perspective view of a main part showing a seal structure of a case.

FIG. 5 is a plan view as viewed from an arrow B in FIG. 4;

FIG. 6 is a plan view similarly showing an assembled state.

FIG. 7 is an exploded perspective view showing a conventional example.

FIG. 8 is a longitudinal sectional view of a main part showing the assembled state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Case main body 3 Cover 11 Fitting ridge 12 Peripheral groove 13 Packing 16a Inner surface (press contact surface) 18, 21 Joining surface 19 Contact surface (side surface) d Groove width

Claims (2)

(57) [Scope of request for utility model registration] 1. A case sealing structure for joining a case body and a cover via a packing, wherein a peripheral groove having a constant groove width is provided on a joint surface of the packing with the case body and / or the cover, The case body and / or the cover are provided with a tapered fitting ridge that is press-fitted into a peripheral groove of the packing, and a pressing contact surface corresponding to a side surface of the packing is formed. The case body and / or the front
An engagement hole is formed on the opposite side of the cover
A projection inserted into the engagement hole;
And / or a case seal structure protruding from the cover . 2. The case sealing structure according to claim 1, wherein the width of the peripheral groove of the packing is substantially equal to the width of the tip of the fitting ridge of the case body and / or the cover.