JPH06276643A - Waterproof resin tube for wire harness - Google Patents

Abstract

PURPOSE:To make a wire harness waterproof simply and surely. CONSTITUTION:A flexible waterproof resin tube 15 having specified wall thickness is provided, and it has openings 15a and 15b at its longitudinal both ends for inserting a wire harness 10. And the wire harness 10 is inserted, and the tube 15 is fixed to the wire harness by winding a tape 16 at least on to the peripheral surfaces of the openings at its both ends. And a weep hole 19 is provided in the peripheral surface of the waterproof resin tube at a position to be the lowest end at the time of wire harness laying.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof resin cylinder for a vehicle wire harness.

In a vehicle, there are cases where a wire harness is wired at a position where water drops directly hit. For example,
As shown in FIG. 6, the wire harness W goes out from the cabin side through the dash panel P1 to the outside above the tire house P4 between the front fender P2 and the front fender apron P3, and passes over the tire house P4. The wiring is provided inside the engine room R through a wiring hole provided in the apron P3. Tire house P above
Because the upper part of 4 is a drainage passage for water from the windshield,
Water droplets will be directly applied to the wire harness W wired in this portion. Therefore, the wire harness W to be wired in the portion is provided with a waterproofing means, and a grommet is attached to a wiring hole penetrating the vehicle body panel to prevent water from entering.

As a waterproofing means for the wire harness W, as shown in FIG. 7, usually, an adhesive tape 2 is wound around the outer peripheral surface of a large number of bundled electric wires 1 by double half-wrap winding. The double half-wrap winding is a winding in which the half 2a of the tape 2 in the width direction is overlapped on the upper surface of the tape which has been previously wound, and this half-wrap winding is performed twice by the single layer A and the double layer B on the outer surface. Is going. By performing the double half-wrapping in this way, a gap is not generated between the tapes 2, and water droplets pass through the gaps between the tapes 2 and the electric wire 1.
I try not to flood between the lines.

[0004]

However, since the worker winds the tape by hand, the overlapping of the tapes is not constant, uneven winding is likely to occur, and unwrapped portions may occur. If the tape is not wrapped,
Water may enter between the wires even from a slight gap between the tapes. Further, even if the tape is wrapped, if the wrapped portion is not firmly adhered, water will be generated from the wrapped gap. Furthermore, the tapes usually used are deteriorated due to aging and are easily scratched, and sometimes they are torn by interfering with burrs and edges of the vehicle, and water is also generated from the torn parts.

As described above, when water is generated between the wires of the electric wire 1 through the gap of the tape 2, water is transmitted to the connector connected to the electric wire 1 and a short circuit occurs at the connector portion. .

As described above, waterproofing cannot be assured only by winding the tape 2 and the tape 2 is easily broken. Therefore, when a corrugated tube (not shown) is fitted on the tape 2 after the tape 2 is wound. There is also. However, if the corrugated tube is further attached after the tape 2 is wound, there is a problem that it is troublesome and the cost becomes high.

Further, as shown in FIG. 8, in the engine room or the like, the winding end portion X1 of the tape 2 in the portion W-1 to be wired in the vertical direction of the wire harness W, the branch point X2 of the wire harness, and the upward direction of the connector. Water droplets 3 may infiltrate between the wires 1 through the opening X3. In this case, the water droplets 3 flooded between the lines cannot be discharged to the outside by the tape 2 wound around the outer peripheral surface. Therefore, there is a risk that the wire 4 may be dropped along the electric wire 1 downwardly, and further may reach the connector 4 at the tip end along the wire to cause a short circuit in the connector 4.

The present invention has been made in view of the above problems, and it is possible to reliably prevent water from entering between wires of an electric wire, to prevent the electric wire from tearing more easily than a tape, and to attach the electric wire to the electric wire very easily. And to provide a waterproofing means capable of discharging the water that has been infiltrated before it reaches the tip of the wire harness connected to the connector when water is infiltrated between the wires from the unwaterproofed part of the wire harness. I am trying.

[0009]

In order to achieve the above object, the present invention provides a flexible waterproof resin tube having a required wall thickness and having openings at both ends in the length direction. Through the wire harness, at least the outer peripheral surface of the opening at both ends is taped to be fixed to the wire harness, and the peripheral surface of the waterproof resin cylinder, which is the lowest end position when wiring the wire harness, is wet. It is intended to provide a waterproof tube for a wire harness, which is provided with a hole.

It is preferable that the waterproof resin cylinder is externally fitted to a portion of the wire harness which is continuous with the wiring portion in the vertical direction, and is fixedly attached to the outer peripheral surface of the wire harness. In the vertical wiring part of the wire harness, water droplets may infiltrate from the winding end of the tape, but in this case, the water droplets that enter the inside of the waterproof tube along the wire will reach the bottom end position of the waterproof resin tube. Since the water drain hole is provided, the water is drained to the outside through the water drain hole.

Further, in the waterproof resin cylinder, the periphery of the drainage hole is colored so that the drainage hole is located at the lowermost position, or a line is formed along the lower end where the drainage hole is provided. It is colored linearly.

The waterproof resin cylinder is made of vinyl chloride, polyethylene or the like and has a wall thickness of about 100 to 200 μm. The waterproof resin cylinder is continuously molded and cut according to the length of the portion to be used.

[0013]

Since the waterproof resin cylinder of the present invention has an endless cylindrical shape in the circumferential direction, it is possible to surely prevent water from being infiltrated, moreover, it is hard to break as compared with the conventionally used tape and the body panel Even if it interferes with burrs or edges, it will not easily break.

Further, even if water is generated between the lines from the portion where the waterproof resin cylinder is not attached, the water drain hole is provided at the lowest end position inside the waterproof resin cylinder, so It is possible to reliably discharge the water that has been flooded between the wires, and it is possible to reliably prevent a short circuit from occurring at the connector that has reached the tip of the wire harness.

[0015]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. 1 (A) and 1 (B) show a waterproof resin cylinder 15 according to the present invention, and the waterproof resin cylinder 15 is similar to FIG.
And a wire harness 1 arranged in the flooded area shown in FIG.
It is attached to 0. That is, the wire harness 10 in which a large number of the electric wires 1 are bundled penetrates through the wiring hole 11 of the dash panel P1 as schematically shown in FIGS. 2 and 3, and the tire house between the front fender and the front fender apron P3. The wiring is provided so as to pass through the upper surface of P4 and enter the engine room through the wiring hole 12 provided in the front fender apron P3. In the wire harness 10, a grommet 13 is attached to a penetrating portion of the dash panel P1 with respect to the wiring hole 11, a connector 14 is connected to a tip on the indoor side, and a connector 14 'is also connected to a tip on the engine room side. ing.

A waterlogged area (shown by diagonal lines in FIG. 3) where water droplets may reach directly from the mounting position of the grommet 13 to the wiring hole 12 of the front fender apron P3.
The waterproof resin cylinder 15 is attached to the wire harness 10 located at. Therefore, the waterproof resin cylinder 15 has a length corresponding to the length of the portion to be wired in the water-immersed area.

The wire harness 10-1 entering the inside of the engine room through the wiring hole 12 provided in the front fender apron P3 is unlikely to be affected by water droplets in the engine room as much as the above-mentioned inundation area. The electric wire 1 is wrapped with a normal tape 18 to bind it,
A part of the wire harness 10-1 around which the tape 17 is wound is vertically wired as shown.

The waterproof resin cylinder 15 shown in FIGS. 1 (A) and 1 (B) is constructed so as to be able to cope with the case where water leaks from the wire harness 10-1 to the wire. That is, as shown in the figure, the waterproof resin cylinder 15 has a cylindrical shape having openings 15a and 15b at both ends, and one colored line mark 18A is provided along the length direction of the waterproof resin cylinder 15, and on the line mark 18A. A drain hole 19 is provided at a predetermined position (a position which is the lowermost position when the vehicle is mounted), and the drain hole 19 is provided.
A colored circle mark 18B is also applied to the outer peripheral portion of the.

The waterproof resin cylinder 15 is made of vinyl chloride and has a wall thickness of 100 to 200 μm so that it will not be easily broken even if it hits a burr or an edge of the vehicle body, and is easily bent along the inserted wire harness 10. .

The waterproof resin cylinder 15 is connected to the wire harness 10
In the work of attaching the waterproof resin tube 15 to the necessary portion of the wire harness 10 in a state in which the one end opening 15a is inserted from the connection side with the connector 14 and the other end opening 15b is positioned at the tip of the grommet 13. The entire flooded area will be covered when mounted on the vehicle.

In this state, the grommet 13 is provided with a protrusion (not shown) at the lower end position when the vehicle is mounted, so that the line mark 18A of the waterproof resin cylinder 15 is on the same line as the protrusion. To position. In this state, at least the outer peripheral surfaces of the openings of both ends of the waterproof resin cylinder 15 are wrapped with tapes 16 and 16, one end of the waterproof resin cylinder 15 is tightly fixed to the outer peripheral surface of the grommet 13, and the other end is the outer periphery of the wire harness 10. It is firmly fixed to the surface. still,
When the length of the waterproof resin cylinder 15 is large, the adhesive tape 16 is wound around an appropriate portion of the intermediate portion to be tightly fixed to the wire harness 10.

As shown in FIG. 3, when the wire harness 10 to which the waterproof resin cylinder 15 is attached is mounted on a vehicle, the waterproof resin cylinder 15 is attached to the entire flooded area occupied by diagonal lines and the water drainage is performed. The hole 19 is arranged at the lowermost position.

As described above, since the wire harness 10 arranged in the flooded area is covered with the waterproof resin cylinder 15, first,
It is possible to prevent water droplets directly applied to the wire harness from infiltrating between the wires. Further, as shown in FIG. 4, by wiring the wire harness 10-1 in the up-down direction in the engine room, the winding end X1, the branch point X2 of the tape 17 and the opening point X3 of the connector are connected to the wire harness 10-1. Even if the water droplets 3 infiltrate between the lines, when the water droplets 3 descend along the lines of the wire harness and enter the inside of the waterproof resin cylinder 15, they enter through the water drain hole 19 provided at the lowermost position thereof. The water droplets are discharged.

Further, as shown in FIG. 5 (A), the wire harness 10 is completed as a wire harness product with the connectors 14, 14 'and the grommet 13 attached and the waterproof resin cylinder 15 attached. When shipping and delivering to the
To house. At this time, if a large number of wire harness products are stacked and housed in the poly case 30, there is a possibility that the portion wound with the tape 17 may be broken at the edge of the connector connected to the wire harness or the like. The tape 17 may be broken due to fatigue caused by use. Even if the tape 17 is damaged in this way and water is generated from that portion, the water droplets that have soaked in the waterproof resin tube 1 along the electric wire.
When the portion 5 is reached, since the water drain hole 19 is provided at the lowermost position, the water droplets that have entered the inside of the waterproof resin cylinder can be reliably discharged from the water drain hole 19.

[0025]

As is clear from the above description, the waterproof resin cylinder according to the present invention is covered with the wire harness for wiring in the water-immersed area, and at least the end portion thereof is fixed with the tape winding. The wire harness can be easily and reliably waterproofed. In addition, since the water drain hole is provided at the lowermost position, even if water leaks between the wires of the wire harness from the portion that is not waterproofed by the waterproof resin cylinder, this water will be drained by the waterproof resin cylinder. Can be discharged from the hole. Therefore, the water can be drained before the water drops reach the connector connected to the tip of the wire harness.

Further, since the waterproof resin cylinder is simply covered with the wire harness and both ends thereof are fixed to the wire harness by the tape winding, the waterproof resin tube is extremely doubled in comparison with the conventional double-wrap winding. It can be done easily and efficiently.

[Brief description of drawings]

FIG. 1 shows a waterproof resin cylinder according to the present invention, (A) is a bottom view and (B) is a perspective view.

FIG. 2 is a fragmentary perspective view showing a state in which the wire harness to which the waterproof resin cylinder is attached is wired to a vehicle body.

FIG. 3 is a schematic front view showing a state in which the wire harness to which the waterproof resin cylinder is attached is wired to a vehicle body.

FIG. 4 is a perspective view showing a drainage action of the waterproof resin cylinder.

FIG. 5 (A) is a schematic perspective view showing a set of wire harness to which the waterproof resin cylinder is attached, and FIG. 5 (B) is a schematic view showing a state in which the wire harness shown in FIG. It is a perspective view.

FIG. 6 is a schematic diagram showing a wiring position of a wire harness that needs to be waterproofed.

FIG. 7 is a schematic cross-sectional view showing a conventional waterproofing method.

FIG. 8 is a perspective view showing a path through which water droplets enter a wire harness.

[Explanation of symbols]

 1 Electric Wire 10 Wire Harness 13 Grommet 14 Connector 15 Waterproof Resin Cylinder 16, 17 Tape 19 Drainage Hole

Claims (2)

[Claims] 1. A flexible waterproof resin cylinder having a required wall thickness is provided, and openings are provided at both ends in the length direction,
While penetrating the wire harness, at least the outer peripheral surfaces of the both end openings are taped to be fixed to the wire harness, and a drain hole is formed on the peripheral surface of the waterproof resin cylinder which is the lowermost position when wiring the wire harness. The waterproof resin cylinder for the wire harness, which is provided with. 2. The waterproof resin cylinder for a wire harness according to claim 1, wherein the waterproof resin cylinder is externally fitted and fixed to a portion that is continuous with a vertical wiring portion of the wire harness.