JP2894144B2 - 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 passes through the dash panel P1 to the outside above the tire house P4 between the front fender P2 and the front fender apron P3 from the passenger compartment side, passes through the tire house P4, and passes through the front fender. 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 causes water to enter between the wires. In addition, even if the tape is wrapped, if the wrapped portion is not securely adhered, water may be generated from the wrapped gap. In addition, the tapes normally used deteriorate with aging and are easily scratched,
In some cases, the vehicle may break due to interference with burrs or edges of the vehicle, and water is also generated from the broken portion.

As described above, when water is introduced into the space between the wires 1 through the gap between the tapes 2, the water is transmitted into the vehicle cabin along the lines, and then into a connector (not shown) connected to the end of the wire 1. And a short circuit occurs at the connector.

[0006] As described above, since the waterproofing is not ensured only by wrapping the tape 2, and the tape 2 is easily broken, the corrugated tube may be further fitted after the tape 2 is wrapped. However, when a corrugated tube is further mounted on the tape winding, there is a problem that it takes time and cost.

Further, as shown in FIG. 10A, when the wire harness W has a branch portion W-1, the tape 2 is hardly wound at the branch point P, and a gap C is easily generated at the joint of the tape 2. Water is generated from the gap C. Therefore, FIG.
As shown in (2), the branch point P may be detoured to a position where water droplets do not directly fall. However, when the branch part W-1 is detoured in this way, the electric wire is not long,
There has been a problem that the number of windings of the tape on the elongated electric wire increases, or the necessity of attaching an exterior tube arises, so that the cost is increased and the number of operations is increased.

The present invention has been made in view of the above-mentioned problems, and it is possible to reliably prevent infiltration of an electric wire between lines, to make it less likely to be broken than a tape, and to make it extremely easy to mount the electric wire. It is intended to be. further,
It is an object of the present invention to ensure that when a wire harness has a branch, waterproofing can be achieved without bypassing the branch.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a waterproof resin cylinder having both a required thickness and rigidity that is resistant to tearing and having both ends opened and having flexibility. The present invention provides a waterproof structure of a wire harness in which a tube is externally fitted over the entire length of a wire harness for wiring in a flooded area, and at least both ends are taped and tightly fixed to the outer peripheral surface of the wire harness. is there.

[0010] The waterproof resin cylinder has a simple cylindrical shape when the wire harness to be externally fitted has no branch portion and is linear, while when the wire harness has a branch portion,
The branch cylindrical portion is formed so as to continuously protrude from a required position of the cylindrical shape, and the branch portion of the wire harness is externally fitted by one continuous waterproof resin cylinder.

In the case where a wire harness is made to penetrate a grommet mounted in a wiring hole of a vehicle body panel, an end of an opening of the waterproof resin cylinder may be closely fixed to an outer peripheral surface of the grommet.

Further, an outwardly bent portion is provided in the opening at the tip end of the waterproof resin cylinder, and the tip outer peripheral surface of the folded portion is tape-wrapped and fixed to the outer peripheral surface of the wire harness or the outer peripheral surface of the grommet attached to the wire harness. Along with
The folded portion having a substantially V-shaped cross section by the tape winding may be used as a drainage guide portion that receives water droplets transmitted along the outer peripheral surface of the waterproof resin cylinder and then discharges the discharged water droplets.

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. Also, the diameter is set slightly larger than the outer diameter of the wire harness so that the wire harness can be easily inserted into the inside.

[0014]

According to the present invention, it is only necessary to insert the waterproof resin tube into the wire harness, wrap both ends and, if it is long, a required portion of the intermediate portion with a tape and tightly fix it to the wire harness. The wire harness can be waterproofed extremely easily as compared with winding.

Further, since the tape is cylindrical, it is possible to reliably prevent water from infiltrating. Moreover, since the tape is harder than a conventional tape and is less likely to be torn, it may interfere with burrs and edges of the vehicle body. Not easy to break.

Further, for a wire harness having a branch portion, a waterproof resin tube having a branch tube portion is used.
It is not necessary to divert the branch to a position where no water drops are applied. Further, since the branch portion is integrally formed, the disadvantage that water is flooded from the branch point as in the related art can be eliminated.

Further, a case where a drainage guide portion having a V-shaped cross section is provided by folding the open end of the waterproof resin cylinder outward and fixing the tip end thereof tightly to the outer peripheral surface of the wire harness or grommet by tape winding. Since the water droplets flowing along the outer peripheral surface of the waterproof resin cylinder can be drained to the outside after being received by the drain guide section, it is possible to reliably prevent water droplets from entering between the lines from the opening end of the waterproof resin cylinder.

[0018]

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 3 show a first embodiment. A wire harness 10 in which a large 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 11 provided in the front fender apron P3. The wire harness 10 has a grommet 13 attached to a portion penetrating through the wiring hole 12 of the dash panel P1 and a connector 14 connected to a tip on the indoor side. Engine room R
A connector 14 'is also connected to the end on the 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 a cylindrical shape with both ends opened, and has a connector 14 and a grommet 13 attached to the wire harness 10, and has one end opening 15a in the length direction.
The diameter is set so that it can be more easily inserted.

The waterproof resin tube 15 is formed of vinyl chloride and has a thickness of 100 to 200 μm so that it does not easily break even when it hits a burr or an edge of a vehicle body and is easily bent along the inserted wire harness 10.

The waterproof resin tube 15 is connected to the wire harness 10
The opening 15a is positioned up to the tip of the inundation area with the other end opening 15b positioned at the tip of the grommet 13 from the connection side with the connector 14 while the other end opening 15b is positioned at the tip of the grommet 13. Is externally fitted to the wire harness 10.

In this state, adhesive tapes 16 are wound around the outer peripheral surfaces of the openings 15a and 15b at both ends, and the waterproof resin tube 1
One end of 5 is fixedly attached to the outer peripheral surface of the grommet 13, and the other end is fixedly attached to the outer peripheral surface of the wire harness 10. When the length of the waterproof resin tube 15 is large, an adhesive tape 16 is wound around an appropriate portion of the intermediate portion to be tightly fixed to the wire harness 10.

FIGS. 4 and 5 show a second embodiment, in which a wire harness 10 'branches off from a main portion 10'-1.
This is intended for a case where the wire harness 10 ′ is provided, and a waterproof resin tube 15 ′ is attached to the wire harness 10 ′. The waterproof resin tube 15 'is a straight cylindrical portion 15'
-1, a cylindrical branch tube portion 15'-2 is continuously provided from a predetermined position on the peripheral surface of the wire harness 10 '. I correspond.

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. Next, the tape 16 is wound around both ends of the linear cylindrical portion 15'-1 to be tightly fixed to the wire harness 10 ', and the tape 16 is also wound around the tip opening side of the branch tubular portion 15'-2 to form the branch portion 10'. -2.

If the wire harness has a large number of branch portions, the branch tubular portion may be provided continuously from the linear cylindrical portion, which is the main tubular portion, in accordance with the position and number of the branch portions.

FIGS. 6 (A), 6 (B) and 7 show a third embodiment, in which a waterproof resin tube 15 "is provided with an outwardly bent portion 15" at the tip opening.
-3 is provided, and the outer peripheral surface of the leading end of the folded portion 15 "-3 is wrapped around the tape 16 to be tightly fixed to the grommet 13. The hatched portion represents the tape 16 in FIG.

When the leading end of the folded portion 15 "-3 is wrapped with the tape 16, the folded portion 15" -3 has a V-shaped cross section as shown in the figure, and as shown by an arrow in FIG. After the water droplets 20 flowing along the outer peripheral surface are stored in the folded portion 15 "-3, they are discharged outward along the outer wall. In this way, the folded portion 15 "-3 can function as a drainage guide portion, and water droplets flowing along the outer peripheral surface of the waterproof resin tube 15" are separated from the line from the open end of the longitudinal end of the waterproof resin tube. Inundation can be reliably prevented.

[0029]

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.

Further, the waterproof resin tube externally fitted to the wire harness has a required wall thickness, is hard to be broken, and has flexibility so as to bend along the wire harness. The wiring can be flexed so as not to hit the burrs or edges of the vehicle body panel, and even if it hits the burrs or edges, it will not be easily broken.

Furthermore, the waterproofing process can be performed only by covering the waterproof resin tube with the wire harness and fixing both ends of the wire harness with the tape. It can be done easily and efficiently.

In addition, for a wire harness having a branch portion, by using a waterproof resin tube having a branch tube portion, it is not necessary to detour and branch to a position that does not correspond to a flooded area as in the conventional case. Can be shortened, and the inundation from the branch position can be reliably prevented.

Further, a folded portion is provided on the opening end side at the longitudinal end of the waterproof resin tube, and the outer peripheral surface of the folded portion is tape-wrapped and fixed tightly to a wire harness or a grommet. A guide can be formed, and there are various advantages such that water droplets flowing along the outer peripheral surface of the waterproof resin tube can be drained to the outside without being immersed between the lines.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a first embodiment.

FIG. 2 is a perspective view in which the waterproof resin cylinder of the first embodiment is attached to a wire harness.

FIG. 3 is a plan view showing a wiring state of a wire harness having a waterproof structure according to the first embodiment.

FIG. 4 is an exploded perspective view of the second embodiment.

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

FIG. 6A is a front view of the third embodiment, and FIG. 6B is a cross-sectional view.

FIG. 7 is a perspective view showing the operation 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.

FIGS. 10A and 10B are schematic diagrams showing a conventional waterproofing process for a wire harness having a branch portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric wire 10, 10 'Wire harness 10'-2 Branch part 13 Grommet 14 Connector 15, 15', 15 "Waterproof resin cylinder 15'-2 Branch cylinder part 15" -3 Folding part 16 Tape

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 63-172213 (JP, U) Japanese Utility Model Sho 63-24919 (JP, U) Japanese Utility Model Sho 54-34097 (JP, U) Japanese Utility Model Sho 59- 103510 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02G 3/00-3/04

Claims (1)

(57) [Claims] 1. A flexible end having a required thickness.
Use a waterproof resin cylinder with an opening and place the waterproof resin cylinder in the flooded area.
External fitting over the entire length of the wire harness to be wired
At least both ends are taped, and the wire harness is
Waterproofing of the wire harness that is tightly fixed to the outer peripheral surface of the nest
In the structure, the waterproof resin cylinder
A folded part is provided, and the outer peripheral surface of the tip of the folded part is wound with a tape.
Connect to the outer surface of the wire harness or the wire harness.
Attach it tightly to the outer surface of the grommet
Waterproof resin for the folded part that has a substantially V-shaped cross section
Drainage guide that discharges after receiving water droplets traveling on the outer peripheral surface of the cylinder
The waterproof structure of the wire harness used as a part.