JP2010074954A - Waterproof case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof case capable of unfailingly preventing water from permeating the inside. <P>SOLUTION: The waterproof case 1 configuring an electric connection box has: a case body 2; an upper cover 3 for covering an opening portion positioned on the upper part of the case body 2; a lower cover 4 for covering an opening portion positioned on the lower part of the case body 2; and a waterproof shield 5. The waterproof shield 5 includes a column portion 50 provided upright like a column from the case body 2, and a plate-like shield portion 55 continuing to the end of the column portion 50 and disposed on the outside of both a joint 6 between the case body 2 and the upper cover 3 and a joint 7 between the case body 2 and the lower cover 4. Also, in the waterproof shield 5, a plurality of surfaces 51, 52, 53 and 54 inclined in a direction of approaching the joints 6, 7 toward from a center 56 of the shield portion 55 toward the outer edge are provided on the surface of the shield portion 55 which is spaced from the joints 6, 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a waterproof case suitable for use in, for example, an electric junction box attached to an engine room of an automobile.

  A variety of electronic devices are mounted on automobiles. In order to supply electric power to these various electronic devices, an electric connection box is disposed in the vehicle at an appropriate location between a power source and the electronic device. This electrical junction box is composed of a plurality of electrical components such as connectors, relays, and fuses of a wire harness, and a waterproof case that houses these electrical components (see Patent Document 1).

  FIG. 4 is a perspective view showing a waterproof case constituting a conventional electrical junction box. FIG. 5 is an explanatory view for explaining the problems of the conventional waterproof case shown in FIG.

  A waterproof case 101 shown in FIGS. 4 and 5 is detachably attached to the case main body 102 so as to cover a case main body 102 formed in a cylindrical shape by a plurality of peripheral walls 121 and an opening located above the case main body 102. The upper cover 103 is attached, and the lower cover 104 is detachably attached to the case body 102 so as to cover the opening located below the case body 102. The case main body 102, the upper cover 103, and the lower cover 104 are made of an insulating synthetic resin and are formed by well-known injection molding.

  The upper cover 103 includes a ceiling wall 130 facing an opening located on the upper side of the case body 102, and a plurality of second peripheral walls 131 erected from the outer edge of the ceiling wall 130 and overlapping the plurality of peripheral walls 121, respectively. And a plurality of lock arms 132 respectively engaged with a plurality of lock projections 122 provided on the peripheral wall 121. Further, the overlapping portion of the peripheral wall 121 and the second peripheral wall 131, that is, the joint 106, has a stepped shape in order to prevent liquid from entering the waterproof case 101.

The lower cover 104 includes a bottom wall 140 facing an opening located on the lower side of the case main body 102, and a plurality of third peripheral walls 141 erected from an outer edge of the bottom wall 140 and overlapping the peripheral walls 121. And a plurality of lock portions 143 respectively engaged with a plurality of lock receiving portions 123 provided on the peripheral wall 121. Further, the overlapping portions of the peripheral wall 121 and the third peripheral wall 141, that is, the joint 107, have a stepped shape in order to prevent liquid from entering the waterproof case 101.
JP 2000-316219 A

  The above-described conventional waterproof case 101 has a stepped shape in the joints 106 and 107, so that the waterproof case is temporarily waterproof. However, when the vehicle is washed, as shown by an arrow W11 in FIG. , 107 when the liquid is directly sprayed on the gap between the peripheral wall 121 and the second peripheral wall 131, that is, the joint 106, and between the peripheral wall 121 and the third peripheral wall 141, that is, the joint 107. There is a problem that a gap is generated, and the liquid may enter the waterproof case 101 through the peripheral wall 121 as indicated by arrows W12 and W13.

  Therefore, an object of the present invention is to provide a waterproof case that can reliably prevent liquid from entering inside.

  In order to achieve the above object, the invention described in claim 1 is a waterproof case having a case main body and a cover that covers an opening of the case main body, from one of the case main body and the cover. Having a waterproof shield composed of a pillar portion standing in a column shape, and a plate-like shield portion arranged outside the joint of the case body and the cover, connected to the tip of the pillar portion; The surface of the shield part on the side away from the joint is provided with a plurality of surfaces inclined in a direction approaching the joint from the center of the shield part toward the outer edge. It is a waterproof case.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the column portion is formed to be elastically deformable.

  According to the first aspect of the present invention, a column portion standing in a columnar shape from one of the case main body and the cover, and a joint between the case main body and the cover are connected to the tip of the column portion. Since a waterproof shield composed of a plate-shaped shield part arranged outside the liquid crystal is provided, even if liquid is sprayed toward the joint, the liquid hits the shield part to cause the joint to Even if there is a gap between the case body and the cover, i.e., the joint, due to the water pressure of the liquid that hits the shield, there is no direct contact. It is possible to prevent the liquid from entering the inside. In addition, since the surface of the shield part on the side away from the joint is provided with a plurality of surfaces inclined in a direction approaching the joint as it goes from the center of the shield part to the outer edge, the liquid can be The impact on the shield when hitting multiple surfaces can be reduced compared to the case where the side away from the joint of the shield is flat and the liquid is received from the front by the flat surface, The amount of bending of the case body or the cover can be reduced. By these things, the waterproof case which can prevent reliably that a liquid penetrate | invades inside can be provided.

  According to the second aspect of the present invention, since the column portion is formed to be elastically deformable, when the liquid is sprayed from an oblique direction toward the joint, the portion to which the water pressure of the shield portion is applied is pushed. As a result, the pillar portion is bent, and the shield portion can be tilted at a more advantageous angle to waterproof the joint. In addition, the inclination angle of the plurality of surfaces is changed by the inclination of the shield portion, and the direction of the liquid that strikes the surfaces can be changed to an angle that avoids the joint.

  Hereinafter, a waterproof case according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing a waterproof case according to an embodiment of the present invention. FIG. 2 is an explanatory diagram for explaining the operational effect when liquid is ejected to the waterproof case shown in FIG. FIG. 3 is an explanatory view for explaining the operational effect when the liquid is ejected from the oblique direction to the waterproof case shown in FIG.

  The waterproof case 1 according to the present embodiment accommodates a plurality of electrical components such as a wire harness connector, a relay, a fuse, and an electronic control unit on the inside to constitute an electrical junction box. The electrical junction box is attached to an engine room of a car and supplies power to various electronic devices mounted on the car.

  In addition, the term “waterproof” as used in the present invention is not limited to preventing the entry of water, but means that it effectively acts on all liquids including water, oil, alcohol, etc. The description will be made using “waterproof” widely used as a name.

  As shown in FIG. 1, the waterproof case 1 is formed in a cylindrical shape by a plurality of peripheral walls 21, and a case main body 2 in which the plurality of electrical components are mounted inside, and an opening positioned above the case main body 2. An upper cover 3 as a cover that is detachably attached to the case body 2 in a manner that covers the part, and a lower cover as a cover that is detachably attached to the case body 2 in a form that covers the opening located below the case body 2 4 and a waterproof shield 5 provided integrally with the case main body 2. Further, the case body 2, the upper cover 3, the lower cover 4, and the waterproof shield 5 are made of an insulating synthetic resin and are formed by well-known injection molding.

  The upper cover 3 includes a ceiling wall 30 facing an opening located on the upper side of the case body 2, and a plurality of second peripheral walls 31 that stand from the outer edge of the ceiling wall 30 and overlap the peripheral walls 21. And a plurality of lock arms 32 respectively engaged with a plurality of lock projections 22 provided on the peripheral wall 21. Further, the overlapping portions of the peripheral wall 21 and the second peripheral wall 31, that is, the joints 6, are stepped to prevent liquid from entering the waterproof case 1.

  The lower cover 4 is erected from the outer wall of the bottom wall 40 (see FIG. 2) facing the opening located on the lower side of the case body 2 and overlaps the plurality of peripheral walls 21. A plurality of third peripheral walls 41 and a plurality of lock portions 43 respectively engaged with the plurality of lock receiving portions 23 provided on the peripheral wall 21 are provided. In addition, the overlapping portions of the peripheral wall 21 and the third peripheral wall 41, that is, the joint 7, have a stepped shape in order to prevent liquid from entering the waterproof case 1.

  As shown in FIGS. 1 and 2, the waterproof shield 5 is connected to a column part 50 erected in a column shape from one peripheral wall 21 of the case body 2, and to the tip of the column part 50, and the case body 2 and the upper cover 3. And a plate-like shield portion 55 disposed outside both the joint 7 of the case body 2 and the lower cover 4. Further, the waterproof shield 5 has a plurality of inclined surfaces in the direction of approaching the joints 6 and 7 toward the outer edge from the center 56 of the shield part 55 on the surface of the shield part 55 away from the joints 6 and 7. Surfaces 51, 52, 53, 54 are provided. Such a shield part 55 has a rhombus shape in plan view.

  In the waterproof case 1 having the above-described configuration, when liquid such as rain water or condensed water adheres to the surface, the liquid enters the inside of the joints 6 and 7 due to the stepped shape of the joints 6 and 7. Is prevented.

  In the present invention, when a car wash liquid or the like is sprayed toward the joints 6 and 7 as shown by an arrow W1 in FIG. When hitting 51, 52, 53, 54, the direction can be changed to an angle for opening the joints 6, 7 as indicated by arrows W 2, W 3. As a result, the liquid is prevented from directly hitting the joints 6, 7, and for this reason, the peripheral wall 21 is bent due to the water pressure of the liquid hitting the shield portion 55, and the case body 2 and the upper cover 3, Even when a gap is generated between the case body 2 and the lower cover 4, that is, at the joints 6, 7, the liquid is prevented from entering the waterproof case 1 from these gaps.

  Furthermore, in the present invention, the liquid indicated by the arrow W1 is received by the plurality of surfaces 51, 52, 53, 54 that are inclined in the direction approaching the joints 6, 7 from the center 56 of the shield portion 55 toward the outer edge. Therefore, when the liquid hits the plurality of surfaces 51, 52, 53, 54, the impact on the shield part 55 is made flat on the side away from the joints 6, 7 of the shield part 55. Thus, the liquid can be reduced by the flat surface as compared with the case where the liquid is received from the front, and the amount of bending of the peripheral wall 21 can be reduced. By these things, it can prevent reliably that a liquid penetrate | invades into the inside of the waterproof case 1. FIG.

  Further, in the present invention, as shown in FIG. 2 and FIG. 3, the column portion 50 is formed thin so as to be elastically deformable. Therefore, as shown by an arrow W4 in FIG. Is sprayed toward the joints 6 and 7 from an oblique direction, the portion of the shield portion 55 to which water pressure is applied is pushed, the column portion 50 is bent, and the shields 6 and 7 are waterproofed at a more advantageous angle. The part 55 can be tilted. In addition, the inclination angle of the plurality of surfaces 51, 52, 53, and 54 is changed by the inclination of the shield portion 55, and the directions of the liquids impinging on the plurality of surfaces 51, 52, 53, and 54 shown by the arrow W4 are aligned with each other. You can change the angle to avoid.

  Further, the inclination angle of the plurality of surfaces 51, 52, 53, 54 of the waterproof shield 5 and the thickness of the column 50 are determined depending on the actual mounting angle of the waterproof case 1, the expected liquid jetting direction, and the like. It can be set accordingly. Moreover, it is effective to provide such a waterproof shield 5 at a place where it is assumed that the sprayed liquid hits. In other words, the waterproof shield 5 according to the present invention is sufficient if the shield portion 55 is disposed outside at least a part of the joints 6 and 7.

  In the embodiment described above, the waterproof shield 5 is provided integrally with the case body 2. However, in the present invention, the waterproof shield 5 may be provided integrally with the upper cover 3 or the lower cover 4. In the present invention, the waterproof shield may be provided separately from the case body 2, the upper cover 3, and the lower cover 4 and attached thereto. Further, in this case, the pillar portion may be formed of urethane rubber or the like so that the pillar portion can be elastically deformed. Furthermore, in the present invention, a plurality of waterproof shields may be provided.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

It is a perspective view which shows the waterproof case which concerns on one embodiment of this invention. It is explanatory drawing explaining the effect when a liquid is injected with respect to the waterproof case shown by FIG. It is explanatory drawing explaining the effect at the time of the liquid being injected from the diagonal direction with respect to the waterproof case shown by FIG. It is a perspective view which shows the waterproof case which comprises the conventional electrical junction box. It is explanatory drawing explaining the problem of the conventional waterproof case shown by FIG.

Explanation of symbols

1 Waterproof case 2 Case body 3 Upper cover (cover)
4 Lower cover (cover)
5 Waterproof shield 6, 7 Joint 50 Column 51, 52, 53, 54 Face 55 Shield 56 Center

Claims (2)

In a waterproof case having a case body and a cover that covers the opening of the case body,
A column portion standing upright from one of the case main body and the cover, a plate-shaped shield portion connected to the tip of the column portion, and disposed outside the joint of the case main body and the cover; Having a waterproof shield composed of, and
A waterproof case characterized in that a plurality of surfaces inclined in a direction approaching the joint as it goes from the center of the shield to the outer edge are provided on the surface of the shield that is away from the joint. .   The waterproof case according to claim 1, wherein the column portion is formed to be elastically deformable.

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