JP2003143731A - Waterproof structure of wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely make waterproof a section where a wire harness branches in a submergible area in an engine room. SOLUTION: Waterproof structure for a wire harness which is arranged in a submergible area in the engine room of an automobile and in which a branch line is branched into T-shape from a trunk line and which prevents the occurrence of submersion from the T-shaped branch position to the side of the trunk line, and a leaf of rectangular waterproof sheet where an adhesive agent is applied on the rear is used, and both sides are wound around the external surface of the trunk line in the condition with the center of the waterproof sheet being positioned at the downside of the trunk line in the T-shaped branch position, and also both flanks extended from the top end of the trunk-winding section are stuck to each other, catching the root of the brunch line into a sealed water state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a wire harness, and more specifically, in a wire harness arranged in an engine room of an automobile, a branch line branches upward or upward in a flooded area from a trunk side. It is intended to prevent the intrusion of water from the branched portion to the main line side with a simple structure at a portion where there is a portion.

[0002]

2. Description of the Related Art Conventionally, a wire harness (referred to as an engine room harness or a front harness) for connecting a battery mounted in an engine room of an automobile to a junction box arranged on the indoor side is arranged in a vehicle length direction. There is. The main line of this wire harness is branched so that the branch line rises upward and connected to a relay box or the like.

As shown in FIG. 4, a portion where the trunk line W / H-1 of the above-mentioned wire harness branches so that the branch line W / H-2 rises upward is a flooded region. From this T-shaped branch position In order for the water that travels along the branch line to flow into the main line and further infiltrate indoors, it is necessary to take waterproofing measures at the position where the branch line branches.

Conventionally, as a waterproof measure, a tape T is half-wrapped around the wire group of the trunk line W / H-1 and the branch line W / H-2 to prevent the wire from being exposed to the outside, and the branch line is branched. Avoid the position, as shown in Figure 5,
Protective sheets S are wrapped around the trunk lines on both sides of the trunk line, respectively, and are adhered to each other with the adhesive 2 applied to the tip.

[0005]

The tape T is half-wrapped around the wire group of the branch line. However, if water is vigorously applied when washing the car, water cannot be prevented from entering through the gap between the tapes. Further, the protection sheet S wound around the main line blocks water from the branch line. However, since the protection sheet S is not wound around the root of the branch line, the main line is likely to be flooded from this part. In that case, the protective sheets S wrapped around both sides are useless. further,
Since the protective sheets S are respectively wound around both sides of the trunk line that straddles the branch lines, two protective sheets S are required, and it is necessary to separately attach the protective sheets S, which causes a problem of poor workability.

The present invention has been made in view of the above problems, and it is an object of the present invention to surely prevent the occurrence of water infiltration from a T-shaped branch position by a simple operation.

[0007]

In order to solve the above-mentioned problems, the present invention is arranged in a flooded area in the engine room of an automobile, and a branch line branches off from the main line in a T-shape. A waterproof structure of a wire harness for preventing water from entering the main line side, wherein a rectangular waterproof sheet having an adhesive applied to the back surface is used, and the central portion of the waterproof sheet is located at the T-shaped branch position. Wires are wound on both sides of the main line while being positioned on the underside of the main line, and both sides extending from the upper end of the main line winding part are stuck together with the root part of the branch line sandwiched in a sealed state. We provide a waterproof structure for harnesses.

As described above, in the present invention, the waterproof sheet, which has been conventionally used as two sheets, is replaced with one waterproof sheet.
At the T-shaped branch position, the waterproof sheet is wound so as to be sandwiched from both sides in the circumferential direction from the trunk line portions on both sides in the horizontal direction to the branch lines in the vertical direction, and both ends thereof are bonded together. In this way, with a single waterproof sheet, both the trunk line and the branch line at the T-shaped branch position can be wrapped around by exposing the electric wire and sealing the water, so that the occurrence of water intrusion from the branch position can be ensured. Can be prevented.

The branch line is branched in a direction in which the branch line rises upward from the main line, and in the vicinity of the left and right ends of the waterproof sheet, the joints on the left and right sides of the branch line are wound from the outer peripheral surface of the winding part of the main line. The tape is wound, and the tape is wound from the tip of the portion sandwiching the branch line to the branch line.

A vinyl chloride sheet having a required thickness is used as the waterproof sheet, and an adhesive material is previously applied to the back surface thereof.
Therefore, when the waterproof sheet is wound around the main line and the branch line, the outer peripheral surfaces of these lines can be brought into close contact with each other. If you completely eliminate the gap that occurs in, you can achieve a more waterproof function.

The front end side of the waterproof sheet wound around the T-branch position of the wire harness is housed inside a protector penetrating the trunk of the wire harness.
As described above, when the tip of the waterproof sheet wound around the main line is located inside the protector attached to the main line, it is possible to more reliably prevent the occurrence of water intrusion from the tip of the waterproof sheet.
The tape need not be wrapped around the tip of the waterproof sheet located inside the protector.

[0012]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The wire harness shown in FIG. 1 is arranged in the engine room of an automobile in the same manner as in FIG. 4, and a trunk line W / H-1 branches off into a T-shaped branch line W / H-2. The branched branch line W / H-2 rises upward. This branch position corresponds to the flooded area, and therefore, when water is vigorously splashed from above during car washing or the like, the water is transmitted to the main line W / H-1 side along the upward branch line W / H-2. The right side of the trunk line W / H-1 in the figure extends to the passenger compartment, and the protector 13 is provided at a position close to the T-shaped branch position to prevent the interference with an external interference material.
It is attached to H-1.

The main line W / H-1 and the branch line W / H-2
The tape T is preliminarily half-wrapped around the electric wire group constituting the above, so that the electric wire group is not exposed to the outside.

The T-shaped branch portion is made of vinyl chloride,
One rectangular waterproof sheet 10 is wound from the main line W / H-1 side to the branch line W / H-2 side, and both ends thereof are bonded together. The waterproof sheet 10 has a thickness of 0.3 mm, and since the tape for half-wrapping is 0.1 mm, the waterproof sheet 10 has a triple thickness. Also, the waterproof sheet 1
At least 0, the adhesive 11 is applied to the peripheral portion of the back surface so that the adhesive portions adhere to each other and the outer peripheral surfaces of the trunk line and the branch line. The adhesive may be applied to the entire back surface of the waterproof sheet 10.

Specifically, as shown in FIG. 2, both side portions 10a and 10b are connected to the main line W / H with the central portion in the width direction of the waterproof sheet 10 being positioned on the lower surface of the main line at the T-shaped branch position.
-1 is wound around the outer peripheral surface, and both side portions 10a1 and 10b1 extending from the upper end of the trunk winding portion are connected to the branch line W / H-2.
The root parts of the are sandwiched and sealed to each other to attach them to each other. In this embodiment, the length of the portion extending from the main line portion is about 10 mm.

In this state, both side portions 10a1 and 10b1 of the waterproof sheet 10 are adhered to the outer peripheral surface of the wire group on the outer peripheral surface of the branch line W / H-1 via the adhesive 11 on the back surface,
Water drops will not enter. The tip surfaces of both side portions 10a1 and 10b1 extending from the contact portion to the wire group to the left and right sides, and the left and right end edges are also adhered to each other via the adhesive 11 on the back surface.

Further, in order to ensure waterproofness, as shown in FIG. 3, the left and right ends 10c of the waterproof sheet 10,
In the vicinity of 10d, the tape 15 is wrapped around the outer peripheral surface of the trunk winding portion so as to wrap the left and right bonded portions of the branch line, respectively, and the left and right bonded portions of the waterproof sheet 10 are also sealed. Moreover, the tape 16 is provided from the tip of the portion sandwiching the branch line W / H-20 to the branch line.
To completely prevent water droplets from entering from the upper end of the branch portion of the branch line W / H-2.

Waterproof sheet 1 on the right side of the main line W / H-1 in the figure
The front end portion of the winding position of 0 is arranged in the protector 13.

As described above, using one waterproof sheet 10, the trunk line W / H-1 to the branch line W / H at the T-shaped branch position.
-2 is sandwiched between the waterproof sheet 10 and the adhesive 1 in a state where the tip surfaces of the waterproof sheet 10 are closely attached to the outer peripheral surface of the branch line.
If they are pasted together via 1, it is possible to reliably prevent the water droplets falling downward along the branch line W / H-2 from infiltrating into the branch position. Furthermore, since the tape 16 is wound around this portion, the waterproof sheet 10 does not separate from the branch line W / H-2.

[0020]

As is apparent from the above description, according to the present invention, at the T-shaped branch position in the flooded area, 1
The use of a single waterproof sheet, winding both sides of the waterproof sheet from the main line side to the branch line side, and simply sticking the ends together can surely prevent the infiltration of water into the wire group. In particular, when the branch line branches upward, water drops are likely to occur from the side of the branch line due to the drop of water droplets. Therefore, it is possible to effectively prevent the occurrence of inundation from the branch line side. Further, when the root portion at the branch position shown in FIGS. 4 and 5 is not covered with a waterproof sheet, it is not possible to prevent water from entering from an oblique direction, but in the present invention, the root portion is also completely waterproof sheet. Since it is covered with, it is possible to prevent water from entering from an oblique direction.

Further, conventionally, two waterproof sheets were required, but the present invention requires only one sheet, and since only the work of attaching one waterproof sheet is required, the workability is improved. is there.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a method of attaching a waterproof sheet.

FIG. 3 is a view showing tape winding performed after attaching the waterproof sheet.

FIG. 4 is a perspective view showing a conventional example.

FIG. 5 is a view showing a conventional work of attaching a protective material.

[Explanation of symbols] W / H-1 main line W / H-2 branch line 10 tarpaulin 11 Adhesive 13 protector 15, 16 tape T tape

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Claims (3)

[Claims] 1. A waterproof structure for a wire harness, which is arranged in a waterlogged area in an engine room of an automobile and has a T-shaped branch line branching from a trunk line to prevent the occurrence of waterlogging from the T-shaped branching position to the trunk line side. There is one rectangular waterproof sheet with an adhesive applied on the back side, and both sides are the outer circumference of the trunk line with the central part of the waterproof sheet positioned on the lower surface of the trunk line at the T-shaped branch position. A waterproof structure for a wire harness that is wound around a surface and has both sides that extend from the upper end of the main line winding part sandwiched by the root part of the branch line and sealed together in a water-tight state. 2. The branch line is branched in a direction in which the branch line rises upward from the main line, and in the vicinity of both left and right ends of the waterproof sheet, the sticking portions on both the left and right sides of the branch line are respectively wound from the outer peripheral surface of the main line winding portion. 2. The waterproof structure for a wire harness according to claim 1, wherein the tape is wound as described above, and the tape is wound from the tip of the portion sandwiching the branch line to the branch line. 3. The wire harness according to claim 1 or 2, wherein the tip of the waterproof sheet wound around a T-shaped branch position of the wire harness is housed inside a protector penetrating a trunk line of the wire harness. Waterproof structure of wire harness.