JP4253135B2 - Waterproof case - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waterproof structure of a waterproof case for housing electronic devices such as engine control electronic device modules installed in an engine room of an automobile, and more particularly to a waterproof structure sealed with a sealant.
[0002]
[Prior art]
Conventionally, in cases installed in places that receive water and mud during rainy weather driving, such as the engine room of automobiles, or high pressure water during car washing, waterproof packing and seals are provided to ensure the waterproofness of the case. A waterproof structure using an agent or the like is employed, and various grommets are used in the wire harness lead-out portion that is pulled out from the case.
[0003]
For example, a conventional example of the waterproof structure of this type of waterproof case is disclosed in Japanese Utility Model Laid-Open No. 5-45327.
[0004]
FIG. 6 is a perspective view showing a sealing structure of a waterproof case using a sealing agent according to a conventional example, and FIG. 7 is a cross-sectional view of a sealing agent reservoir in FIG.
[0005]
6 and 7, reference numeral 52 denotes a lower case that forms the main body of the waterproof case, and a filling groove 52-1 for preventing the sealant S from flowing out is provided at the upper end of the lower case.
[0006]
Reference numeral 51 denotes an upper case of the waterproof case, and ribs 51-1 are provided on the entire lower surface to form a filling groove 52-1 for the sealant of the lower case.
[0007]
The opening of the lower case 52 is fixed by fixing means (not shown) by setting the upper cover 51 from above after filling the sealing agent filling groove 52-1 with the sealing agent S.
[0008]
F is a sealant reservoir. When the sealant S is filled into the filling groove 52-1, the sealant S starts from the reservoir F of the sealant S and fills clockwise or counterclockwise and ends at this reservoir. This prevents the sealing agent from rising due to the overlapping of the sealing agent (FIG. 8).
[0009]
[Problems to be solved by the invention]
However, in the waterproof case using the sealing agent S of the conventional example, when the sealing agent S is filled in the filling groove 52-1, the sealing agent reservoir F is set to the sealing agent filling start point and end point. Therefore, there is no swell of the sealing agent due to the overlap of the sealing agent, but the volume of the seal reservoir is larger than that of other filling grooves, so that the filling groove 52-1 close to the reservoir F of the sealing agent S is obtained. In order to prevent this, the amount of the sealant S in the reservoir F needs to be strictly controlled in order to prevent this. There was a problem that it could not be used for products that slightly affected performance.
[0010]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a waterproof case with high sealing stability and easy sealing work.
[0011]
[Means for Solving the Problems]
A first configuration for achieving the above object is to provide a waterproof case having a sealing agent filling groove on the dividing surface and sealing with the sealing agent, and providing a widening portion in the filling groove, and the widening portion has a sealing direction. And a rib in parallel with each other, and a sealing agent filling start point and end point are outside the sealing surface of the widened portion.
[0012]
A second configuration is the first configuration, wherein the widened portion is provided at a position corresponding to a pressing surface of a grommet fitted and inserted into a side wall of the waterproof case, and a tip end portion of the rib is The pressing surface of the grommet is pressed.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
1 is an exploded perspective view of a waterproof case according to an embodiment of the present invention, FIG. 2 is an enlarged plan view of a widened portion of a sealing agent filling groove in FIG. 1, and FIG. 3 is a cross-sectional view along AA in FIG. .
[0014]
In FIG. 1, 2 is a lower case which is a main body of the waterproof case, and 1 is an upper case of the waterproof case, both of which are made of 66 nylon resin molded by an injection molding machine.
[0015]
The lower case 2 is formed of a bottom wall 2-1 and a side wall 2-2, and the side wall 2-2 is provided with an opening 2-3 for drawing the wire harness 3-4 from the inside of the lower case 2 to the outside. In the opening, a plurality of grooves 2-5 for improving the sealing function are provided, and a heat insulating sheet 2-4 is laid on the bottom wall 2-1.
[0016]
Reference numeral 4 denotes an electronic equipment module for engine control and the like stored in a metal case 4-1, and the lower case 2 is mounted via brackets 4-2, 4-3 and 4-4 attached to the case 4-1. It is fixed inside by a plurality of bolts 5.
[0017]
Reference numeral 3 denotes a rubber grommet, which includes a pressing surface 3-2, a plurality of protrusions 3-3 to be fitted in the groove 2-5 of the lower case, and a sleeve 3-1.
[0018]
A wire harness 3-4 for connecting the electronic device module 4 and a controlled device such as an engine ignition device is inserted inside the grommet 3, and a connector 3-5 is connected to a terminal of the wire harness 3-4. The connector 3-2 is engaged with the electronic device module 4-1 and is prevented from being detached by the bolt 8.
[0019]
In the grommet 3, a plurality of protrusions 3-3 are fitted and inserted into the grooves 2-5 in the opening of the lower case to ensure waterproofness.
[0020]
The upper case 1 is fastened and fixed to the lower case 2 by a plurality of bolts 6 after the filling agent 1-9 is filled with the sealing agent S by a method described later.
[0021]
The upper case 1 is formed by an upper wall 1-1 and a side wall 1-2, and a protruding portion 1-3 is provided on the side wall 1-2 at a position corresponding to the grommet 3 to ensure a gap with the grommet 3. ing.
[0022]
Moreover, the filling groove | channel 1-9 of a sealing agent is provided in the peripheral part of the upper wall 1-1 orthogonal to the side wall 1-2, and the heat insulation sheet 1-4 is laid in the back surface of the upper wall 1-1. .
[0023]
2 and 3, reference numeral 1-8 denotes a rib for preventing the sealant from flowing out, and is provided over the entire periphery of the upper wall.
[0024]
G is a widened portion serving as a start point and an end point of the filling operation of the sealing agent S provided in the overhang portion 1-3.
[0025]
The widened portion G is provided with ribs 1-5, 1-6, and 1-7 to form a labyrinth.
[0026]
As shown in FIG. 4, the filling method of filling the sealing surface of the sealing agent S with the sealing agent filling groove 1-9 of the upper case 1 is started from the position P (FIG. 2) by a manual or automatic filling device M. It goes around once around the ribs 1-6 and 1-7, and ends at the filling start point P.
[0027]
When the sealant S is orthogonal, the sealant swells in the orthogonal part as shown in FIG. 5 (a). In the present embodiment, the widening part G of the sealant is provided to form the orthogonal part. Therefore, as shown in FIG. 5B, the sealing agent becomes flat and the sealing agent does not rise.
[0028]
However, when the sealant overlaps at the start point and the end point of the sealant, the sealant will rise. However, since this part is outside the seal surface, the seal performance is not affected.
[0029]
Moreover, even if the sealing agent may be insufficient at the starting point and the ending point of the sealing agent, there is a considerable distance from this point P to the sealing surface. Will not be affected.
[0030]
Further, the upper surface 3-2 of the grommet is not only pressed by the sealant S but also pressed from above by the two rows of ribs 1-6 and 1-5, so that the height of the ribs 1-6 and 1-5 is increased. By selecting the thickness, an appropriate pressing force matching the shape of the grommet 3 can be applied, and high reliability of waterproofing of the grommet portion can be ensured.
[0031]
【The invention's effect】
According to the first aspect of the present invention, the widening portion is provided in the filling groove of the sealing agent, and the starting point and the ending point of the sealing agent are provided outside the sealing surface. Even if the sealing agent is swelled or the sealing agent is insufficient, there is an effect that the sealing performance is not affected.
[0032]
Moreover, since the orthogonal part of the sealing agent is excluded, the sealing agent does not rise on the sealing surface, and the effect that the sealing performance is not affected is obtained.
[0033]
According to the invention which concerns on Claim 2, since the rib of a wide part presses the pressing surface of a grommet, the effect that reliable sealing performance can be ensured in a grommet part is acquired.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a waterproof case according to an embodiment of the present invention. FIG. 2 is an enlarged plan view of a widened portion of a sealing agent filling groove in FIG. FIG. 4 is an explanatory diagram for filling a sealant according to an embodiment of the present invention. FIG. 5 is an explanatory diagram of an orthogonal portion of the sealant according to an embodiment of the present invention. 7 is a cross-sectional view (cross-section BB) of a sealant reservoir in FIG.
FIG. 8 is a cross-sectional view of a seal portion (filling start point and end point) of a waterproof case according to another conventional example.
DESCRIPTION OF SYMBOLS 1: Upper case 1-1: Upper wall 1-2: Side wall 1-3: Overhang part 1-4: Thermal insulation sheet 1-5, 1-6: Horizontal rib 1-7: Vertical rib 1-8: Rib 1 -9: Filling groove 2: Lower case 2-1: Bottom wall 2-2: Side wall 2-3: Opening portion 2-4: Thermal insulation sheet 2-5: Groove 3: Grommet 3-1: Sleeve 3-2: Pressing Surface 3-3: Projection 3-4: Wire harness 3-5: Connector 4: Electronic device module 4-1: Case 4-2, 4-3, 4-4: Brackets 5, 6, 7, 8: Bolt S: Sealing agent P: Filling start point and end point F: Reservoir part G: Widening part 51: Upper case 51-1: Rib 52: Lower case 52-1: Filling groove

Claims (2)

In a waterproof case that has a sealing groove on the split surface and seals with the sealing agent,
A widened portion is provided in the filling groove, and the widened portion is provided with a rib parallel to the sealing direction and a rectangular rib,
And the waterproof case characterized by the filling start point and end point of a sealing agent being outside the sealing surface of the said widening part. The widened portion is provided at a position corresponding to a pressing surface of a grommet fitted and inserted into a side wall of the waterproof case;
The waterproof case according to claim 1, wherein a tip end portion of the rib presses a pressing surface of the grommet.

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