JP2792381B2 - Wire harness waterproof 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 waterproof structure for a wire harness for a vehicle, and more particularly, to a wire harness which is wired at a position where water drops are directly applied.

[0002] In a vehicle, a wire harness may be wired at a position directly hit by a water drop. For example,
As shown in FIG. 8, the wire harness W exits above the tire house P4 between the front fender P2 and the front fender apron P3 from the vehicle compartment side through the dash panel P1, and passes through the front fender through the tire house P4. The wiring is provided inside the engine room R through a wiring hole provided in the apron P3. The above tire house P
4 is a drainage passage for water from the windshield,
Water drops are directly applied to the wire harness W wired in this portion. Therefore, the wire harness W to be wired to the relevant portion is provided with a waterproofing means, and a grommet is attached to a wiring hole penetrating through the vehicle body panel to prevent flooding.

As a waterproofing means for the wire harness W, as shown in FIG. 9, an adhesive tape 2 is usually wound around the outer peripheral surfaces of a large number of bundled electric wires 1 by double half-wrap winding. The double half-wrap winding is performed by winding the half 2a in the width direction of the tape 2 on top of the previously wound tape while winding the half-wrap twice with the single layer A and the double layer B on the outer surface thereof. Is going. By performing the double half-wrap winding in this manner, a gap is not generated between the tapes 2, and water droplets are discharged from the gap of the tape 2 to the electric wire 1.
Between the lines.

[0004]

However, since the above-mentioned tape winding is performed manually by an operator, the tape overlap is not constant, and uneven winding is apt to occur, and a portion that is not wrapped may occur. If the tape is not wrapped,
Even a slight gap between the tapes can cause water to enter between the wires. In addition, even if the tape is wrapped, if the wrapped portion is not firmly adhered, water is generated from the wrapped gap. Further, the tape normally used is deteriorated due to aging, is easily damaged, and sometimes breaks due to interference with burrs and edges of a vehicle. Water is also generated from the broken part.

[0005] As described above, when water infiltrates between the wires of the electric wire 1 from the gap of the tape 2, the water is transmitted through the space to the connector connected to the electric wire 1, and a short circuit occurs in the connector portion. .

As described above, the waterproofing is not ensured only by wrapping the tape 2, and the tape 2 is easily torn. Therefore, as shown in FIG. 10, after the tape 2 is further wrapped, the corrugated tube 3 is removed. Sometimes it fits. However, if the corrugated tube 3 is further attached after the tape 2 has been wound, there is a problem that it takes time and costs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is possible to reliably prevent infiltration between wires of an electric wire, to be less likely to be torn than a tape, and to make it extremely easy to mount the electric wire. It is intended to be.

[0008]

In order to achieve the above object, the present invention uses a waterproof resin cylinder having a required thickness and flexibility and having both ends opened and having a diameter larger than the outer diameter of the wire harness. The waterproof resin cylinder is externally fitted in a state of being tightly attached to the outer peripheral surface over the entire length direction of a wire harness for wiring in a flooded area above an automobile tire house, and one end of the waterproof resin cylinder is connected to the wire. The surplus portion of the waterproof resin tube is overlapped with the grommet to be attached to the harness, and the excess portion is folded back and wound three times around the wire harness. In this state, the opening portions at both ends of the waterproof resin tube are wound with tape. And a waterproof structure of the wire harness fixed to the outer peripheral surface of the wire harness.

[0009] It is preferable that the waterproof resin cylinder is welded by superimposing an excess portion in a state of being in close contact with the outer peripheral surface of the wire harness. In this case, the diameter of the waterproof resin cylinder having a large diameter can be reduced in accordance with the outer diameter of the wire harness, and the reduced diameter portion can be securely adhered to the outer peripheral surface of the wire harness.

[0010] It is preferable that the winding by the surplus portion is performed over the entire periphery of the portion that is in close contact with the outer peripheral surface of the wire harness. That is, the surplus portion is a state in which two sheets of the waterproof resin tube are stacked, and thus, when the surplus portion is wound around the entire circumference, three sheets are added to the sheet that is in close contact with the outer peripheral surface of the wire harness. Is wound, so that the waterproof resin tube is less likely to be torn, and the protection function for the wire harness increases. still,
The winding of the surplus portion may be one or more rounds, two rounds or three rounds, and the multiplexing improves the protection function.

In the case where the wire harness has a branch portion, the waterproof resin tube has a shape in which a branch portion is formed by continuously projecting the cylindrical portion from a required position of the cylindrical main portion, and the branch portion of the wire harness is also provided. One continuous waterproof resin tube is used for external fitting, and the surplus portions of the main portion and the branch portion are overlapped and wound.

In the case where the wire harness is passed through the grommet mounted in the wiring hole of the vehicle body panel, the opening end of the waterproof resin tube may be fixed to the outer peripheral surface of the grommet.

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

[0014]

[Function] The waterproof resin cylinder through which the wire harness passes has a connector connected to the tip of the wire harness and a large-diameter grommet mounted at a required position, so its diameter is more indispensable than the outer diameter of the wire harness. Become larger. In the present invention, positively utilizing the fact that the diameter of the waterproof resin cylinder is larger than the outer diameter of the wire harness, and after adhering to the outer periphery of the wire harness, overlapping the surplus portion, further,
It is wrapped around the outer peripheral surface of the part in close contact. In this way, by wrapping the resin tube around the outer peripheral surface of the wire harness in multiple layers, the function of protecting the wire harness can be improved. That is, the same function as when the corrugated tube is externally fitted can be achieved.

[0015] Further, because of the cylindrical shape, infiltration can be reliably prevented, and since it is wound in multiple layers by using the surplus portion as described above, it is hard to tear and interferes with burrs and edges of the vehicle body panel. Not easy to break.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. FIGS. 1 to 5 show a first embodiment, in which a wire harness 10 in which a number of electric wires 1 are bundled passes through a wiring hole 11 of a dash panel P1 and a front fender P2 and a front fender apron P3 as in FIG. The wiring is made to pass through the upper surface of the tire house P4 and to enter the engine room R through the wiring hole 12 provided in the front fender apron P3. The wire harness 10 has a grommet 13 attached to a portion penetrating through the wiring hole 11 of the dash panel P1 and a connector 14 connected to a tip on the indoor side. Further, a connector 14 'is also connected to the end on the engine room R side.

A waterproof resin tube 15 is attached to the wire harness 10 located in a flooded area where a water drop from the attachment position of the grommet 13 to the wiring hole 12 of the front fender apron P3 may be directly applied. Therefore, the waterproof resin tube 15 has a length corresponding to the length L of a portion to be wired in the above-mentioned flooded area.

The waterproof resin tube 15 has openings 15a, 15 at both ends.
The diameter is set such that the connector 14 and the grommet 13 can be inserted through the one end opening 15a in the longitudinal direction in a state where the connector 14 and the grommet 13 are attached to the wire harness 10. Specifically, the size has a circumference approximately twice as large as the circumference of the wire harness.

The waterproof resin tube 15 is formed of vinyl chloride, has a thickness of 100 to 200 μm, and does not easily break even when hitting a burr or an edge of a vehicle body, and easily bends along the inserted wire harness 10. It has nature.

The waterproof resin tube 15 is connected to the wire harness 10
The work of attaching the wire harness 10 to the required portion of the wire harness 10 is performed in a state where the one end opening 15a is inserted into the one end opening 15a from the connection side with the connector 14 and the other end opening 15b is positioned at the tip of the grommet 13. Therefore, it is covered over the entire inundation area at the time of attachment to the vehicle.

In this state, as shown in FIGS. 3A and 3B,
A part of the inner peripheral portion of the waterproof resin tube 15 is brought into close contact with the outer peripheral surface of the wire harness 10. That is, a small-diameter cylindrical portion 15 that makes a part of the waterproof resin cylinder 15 adhere to the entire outer peripheral surface of the wire harness 10.
As c, the remaining surplus portion 15d is protruded to the side.

The surplus portion 15d is superposed from the cylindrical state, and the two sheets 15d-1 and 15d-2 are folded as one thick sheet as shown in FIG. The small-diameter cylindrical portion 15c is wound in close contact with the outer peripheral surface. Therefore, three sheets, that is, one sheet forming the small diameter portion 15c and two sheets of the surplus portion 15d, are wound around the outer peripheral surface of the wire harness 10.

After the outer peripheral surface of the waterproof resin tube 15, that is, the outer peripheral surface of the wound surplus portion 15 d is wound around the outer peripheral surface of the wire harness 10, as shown in FIG. Adhesive tapes 16 and 16 are wrapped around the outer peripheral surface to fix one end of the waterproof resin tube 15 to the outer peripheral surface of the grommet 13 and to connect the other end to the wire harness 1.
0 is closely fixed to the outer peripheral surface. In addition, the waterproof resin tube 15
When the length is large, the adhesive tape 16 is wound around an appropriate portion of the intermediate portion, and is tightly fixed to the wire harness 10.

FIG. 6 shows a second embodiment, in which a waterproof resin tube 15 is provided.
A part of the small diameter cylindrical portion 15c is formed by closely adhering to the outer peripheral surface of the wire harness 10, and a boundary portion between the small diameter cylindrical portion 15c and the excess portion 15d in a state where the surplus portion 15d is protruded to the side, that is, The opening of the small-diameter cylindrical portion 15c is completely closed by welding 20 as shown by hatching in the figure.

When the small-diameter cylindrical portion 15c is completely cylindrical by the welding 20, the small-diameter cylindrical portion 15c can be securely brought into close contact with the outer peripheral surface of the wire harness 10, and the surplus portion 15d is connected to the small-diameter cylindrical portion. When wound around the outer peripheral surface of the portion 15c, the small-diameter cylindrical portion 15c can be smoothly wound without expanding. The other configuration is the same as that of the first embodiment, and the description is omitted.

FIG. 7 shows a third embodiment, which is intended for a case where the wire harness 10 'has a branch portion 10'-2 branched from the main portion 10'-1.
, A waterproof resin tube 15 'is attached. The waterproof resin tube 15 'is a cylindrical branch tube portion 15'-continuously extending from a predetermined position on the peripheral surface of the linear cylindrical portion 15'-1.
2, and the branch tubular portion 15'-2 corresponds to the branch portion 10'-2 of the wire harness 10 '.

The main portion 10'-1 of the wire harness 10 'is passed through the linear cylindrical portion 15'-1 of the waterproof resin tube, and the branch portion 10'-2 is connected to the branch cylindrical portion. 15 '
-2. Then, similarly to the first and second embodiments,
A portion of the straight cylindrical portion 15'-1 and a portion of the branch tubular portion 15'-2 are respectively brought into close contact with the main portion 10'-1 and the branch portion 10'-2 of the wire harness 10 ', and a surplus portion is brought into close contact with the portion. It is folded and wound on the outer peripheral surface.

Incidentally, the branch tube portion 15'-2 of the waterproof resin tube 15'-2.
Cannot be completely adhered to the wire harness, but at a position farther from this branch point, it can be partially adhered to the outer peripheral surface of the wire harness, and the remaining surplus portion can be overlapped and folded and wound I can do it.

After the waterproof resin tube 15 'is attached to the wire harness 10', the tape 16 is wound around the opening at the distal end of the waterproof resin tube 15 'and fixedly adhered to the wire harness 10' in the first and second embodiments. Is the same as

[0030]

As is apparent from the above description, according to the present invention, the waterproof harness for covering the wire harness to be wired in the flooded area is covered with the waterproof resin tube over the entire length of the flooded area, and at least the end is fixed by tape winding. Therefore, it is possible to extremely easily and reliably waterproof the wire harness.

The diameter of the waterproof resin tube externally fitted to the wire harness is larger than the outer diameter of the wire harness.
In addition to allowing the wire harness to pass easily, after passing the wire harness, a part of the large-diameter waterproof resin cylinder was brought into close contact with the outer peripheral surface of the wire harness, and the surplus portion was overlapped and further adhered. Since it is wound around the outer peripheral surface of the waterproof resin cylinder, as a result, the thickness of the waterproof resin cylinder wound around the wire harness can be increased.

As described above, since the resin sheet is wound on the outer peripheral surface of the wire harness in a multi-layered state, the resin sheet is very hard to be torn, and is not damaged even if it comes into contact with a burr or an edge of a vehicle body panel, and is protected against interference. Function increases. That is, the same protective function as when the corrugated tube is fitted can be provided.

Furthermore, the waterproof resin tube can be covered with the wire harness, a part thereof can be adhered to the wire harness, and the excess portion can be further wound. Can be performed very easily and efficiently as compared with the case where the tape is wound in double half-wrap.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a state in which a wire harness having a waterproof structure according to the present invention is attached to a vehicle.

FIG. 2 is an exploded perspective view of the first embodiment.

FIGS. 3A and 3B are a perspective view and a side view showing a step of attaching the waterproof resin tube of the first embodiment to a wire harness.

FIG. 4 is a side view showing a step of attaching the waterproof resin tube of the first embodiment to a wire harness.

FIG. 5 is a perspective view showing a state in which the waterproof resin cylinder of the first embodiment is attached to a wire harness.

FIG. 6 is a perspective view of a second embodiment.

FIG. 7 is an exploded perspective view of the third embodiment.

FIG. 8 is a schematic diagram showing a wiring position of a wiring harness that needs to be subjected to a waterproofing process.

FIG. 9 is a schematic sectional view illustrating a conventional waterproofing method.

FIG. 10 is an exploded perspective view when a corrugated tube, which is one of the conventional waterproofing methods, is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric wire 10 and 10 'Wire harness 13 Grommet 14 Connector 15 Waterproof resin cylinder 15c Small diameter cylinder part 15d Excess part

Claims (1)

(57) [Claims] 1. A waterproof resin cylinder having a required thickness and a flexible opening at both ends and having a diameter larger than the outer diameter of a wire harness is used. The wire harness to be wired to the outside is fitted over the entire outer surface of the wire harness in the longitudinal direction, and one end of the waterproof resin tube is positioned continuously with the grommet attached to the wire harness, and The surplus portion of the resin cylinder is overlapped and folded back and wound around the wire harness in three layers, and in this state, the waterproof opening of both ends of the waterproof resin cylinder is fixed to the outer peripheral surface of the wire harness by tape winding. Construction.