JP2004210158A - Wire harness for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent water from leaking into a compartment caused by a wire harness penetrating a through hole. <P>SOLUTION: While a grommet 11 mounted to the wire harness 10 is fitted into the through hole H and wired from an engine room E into the compartment Y, a group of electric wires (w) are allowed to face down and then turned upward again at a wiring section at the side of the engine room E adjacent to the grommet mounting section, and a downward electric wire 13 at a U turn section 12 is exposed without taping. The U turn section 12 is inserted while being accommodated into one corrugate tube 16, and water entering the inside of the wire harness 10 in the engine room E is drained by fall caused by dead weight through a lower end opening 17 in the corrugate tube 16. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wire harness for an automobile, and more particularly to a wire harness that is routed from an engine room to a vehicle compartment to prevent water from flowing into the vehicle compartment.
[0002]
[Prior art]
When the wiring harness is routed from the engine room of the car to the vehicle room through the through hole of the body panel, water droplets adhering to the wiring harness in the engine room pass through the gap between the wires of the wire harness due to negative pressure during traveling, There is a problem that water leaks into the room through the through hole.
[0003]
For this reason, in Japanese Unexamined Patent Application Publication No. 7-105742 (Patent Document 1), as shown in FIGS. 5A and 5B, a tape is attached to a wire group W of a wire harness W / H arranged in an engine room X of an automobile. T is double-wound (half-wrapped) so that no water is generated.
[0004]
[Patent Document 1]
JP-A-7-105742 [0005]
[Problems to be solved by the invention]
However, even if the tape is wound half-wrapped around the wire group, the wire group is exposed at the lower part of the connector neck of the wire terminal connected to the connector, so that it is impossible to prevent flooding at this exposed position. There is a problem that the water that has entered under the connector neck infiltrates the gap between the tape-wrapped electric wires into the room due to the capillary phenomenon and the negative pressure during the traveling of the vehicle.
[0006]
The present invention has been made in view of the above problems, and has as its object to provide a wire harness for an automobile that can reliably prevent water from flowing from an engine room into a vehicle interior.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a wire harness that is routed from an engine room of an automobile to a vehicle room through a through hole of a body panel,
A grommet is attached to a portion to be inserted into the through hole, and the grommet is attached to the through hole and a wire harness is routed in the vehicle interior.
At the wiring part on the engine room side close to the grommet mounting part, the wires forming the wire harness are turned downward and then U-turned upwards. Expose and insert the U-turn portion in a state housed in one corrugated tube, and tape-fix the upper end of the corrugated tube to a wire harness,
An automobile wire harness is provided, in which water entering the wire harness in the engine room is drained from the group of wires in the corrugated tube through the lower end opening of the corrugated tube by its own weight.
[0008]
With the above configuration, the wire group on the engine room side is tape-wrapped to prevent water infiltration, and a U-turn portion having a folded portion at the lowermost portion is formed at an outdoor routing portion before reaching the grommet. Since the U-turn portion is housed in one corrugated tube without winding the tape around the wire group, water in the wire group can be dropped by its own weight in the corrugated tube and drained to the outside. Even if water is generated from the upper opening of the corrugated tube in the U-turned electric wire group in the corrugated tube, it can be drained from the lower opening of the corrugated tube. As a result, it is possible to reliably eliminate inundation in a group of electric wires extending into the vehicle interior through the grommet.
[0009]
Except for the above-mentioned U-turn part, the wire group of the wiring part in the engine room is half-wrapped with tape and waterproof as in the past, and the upward part of the U-turn part is also half-wrapped with tape. Is preferred.
That is, although the water droplets in the wire group can be reliably discharged by the weight drop in the downward portion of the U-turn portion, the tape portion is wound half-wrapped in the upward portion continuous to the grommet side, so that the wire group in the corrugated tube can be removed. It is possible to reliably prevent water that has been flooded from flowing into the grommet side.
[0010]
In the case where the corrugated tube is a corrugated tube having a slit in which a slit extends in the axial direction, the outer periphery of the corrugated tube is half-wrapped with tape. This can prevent water from entering through the slit of the corrugated tube and adhering to the electric wire.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Each of the embodiments described below is applied to a wire harness that is routed from an engine room X of an automobile to a vehicle room Y through a through hole H of a vehicle body panel P, similarly to the conventional example.
[0012]
FIGS. 1 to 3 show a wire harness 10 according to a first embodiment of the present invention. The wire harness 10 has a grommet at a portion inserted into a through hole H of a vehicle body panel P that separates an engine room X and a vehicle room Y. The grommet 11 is mounted in the through hole H and routed to the vehicle compartment Y. At the wiring site on the engine room E side close to the grommet mounting portion, the wire group w constituting the wire harness 10 is turned downward and then turned upward to form a U-turn portion 12.
[0013]
In the above-mentioned U-turn part 12, the downward electric wire 13 is exposed without winding the tape including the folded part 15, while the upward electric wire 14 is half-wrapped with the tape 21. It is inserted while being housed in the tube 16. The outer peripheral edge of the upper end of the corrugated tube 16 is wound around and fixed to the wire harness 10 with a tape 22, and the lower end 12 a of the U-turn portion 12 is positioned inside the vicinity of the lower end opening 17 of the corrugated tube 16.
The wire harness 10 is half-wrapped with a tape 20 around a group of wires except for the U-turn portion 12.
[0014]
In the wire harness 10 having the above-described configuration, the U-turn portion 12 is provided near the mounting portion of the grommet 11 in the engine room X in the flooded area, and the wire group is exposed without winding the tape around the downward wire 13. As shown in FIG. 3, the water infiltrating the wire group can be drained by dropping downward through the lower end opening 17 of the corrugated tube 16 by its own weight.
In this manner, the electric wire group of the U-turn portion 12 housed in the corrugated tube 16 is exposed to the downward portion and drained, and even if water is generated from the upper end opening in the corrugated tube 16, it goes to the grommet 11 side. Since the tape is wound in the upward portion, no water is generated, and no water is generated in the electric wire group of the wire harness that penetrates the grommet 11 and extends into the vehicle interior Y.
[0015]
Furthermore, by accommodating the U-turn portion 12 formed by folding the wire group w in one corrugated tube 16, the long wire group w can be housed in the short corrugated tube 16 and efficiently and compactly. It is possible to discharge the water droplets immersed in the group w.
[0016]
In addition, the electric wire of the above-mentioned U-turn part does not necessarily have to be wound with a tape in the upward electric wire group, and may be exposed without being wound with the tape. In this case, even if water is flooded from the upper end opening of the corrugated tube into the upward electric wire group, it can be drained from the lower end opening of the corrugated tube by its own weight, but the upward electric wire group is tape-wrapped because it is close to the grommet side. It is preferable to keep it from the viewpoint that the infiltration into the vehicle compartment can be surely shut off.
[0017]
FIGS. 4A and 4B show a second embodiment of the present invention, in which a U-turn portion 12 of an electric wire group w is accommodated in a slit corrugated tube 16 '.
[0018]
The corrugated tube 16 ′ with slits has a slit 16 a ′ extending in the axial direction as shown in FIG. 4A, and as shown in FIG. The outer circumference of the tube 16 ′ is half-wrapped with a tape 24. At the upper end of the corrugated tube 16 ′, the tape 24 is wound around and fixed to the wire harness 10, while the lower end is an opening 17 using the tape 24 as a stop.
The configuration other than the above is the same as that of the first embodiment, and thus the same reference numerals are given and the description is omitted.
[0019]
In the present embodiment, the use of the corrugated tube 16 'having a slit facilitates the mounting and replacement of the corrugated tube 16' to the U-turn portion 12. Further, by winding the outer periphery of the corrugated tube 16 ′ in a half-wrap manner with the tape 24, it is possible to prevent water from entering from the slit 16 a ′ and to ensure waterproofness. Further, the electric wire group w in the engine room E secures drainage by the downward electric wire 13 and the folded portion 15 in the corrugated tube 16 ′, while covering other wiring portions with the tape 21 or the tape 24. Therefore, the effect of preventing water droplets from adhering to the electric wire group w can be greatly increased.
[0020]
【The invention's effect】
As is apparent from the above description, according to the present invention, the U-turn portion is provided in the wire group on the engine room side near the grommet mounting portion and housed in the corrugated tube, and at least the downward portion of the wire in this corrugated tube is provided. Is exposed without being wound with a tape, so that water droplets immersed in the wire group can be drained down by gravity under the corrugated tube. Therefore, it is possible to easily and reliably prevent water from entering the vehicle interior through the grommet.
[Brief description of the drawings]
FIG. 1 is a perspective view of an essential part showing a state in which an automobile wire harness according to a first embodiment of the present invention is installed in a vehicle.
FIG. 2 is a front view of the automobile wire harness shown in FIG.
FIG. 3 is an enlarged perspective view of a main part of the automobile wire harness shown in FIG. 1; FIG. 4 shows a state where an automobile wire harness according to a second embodiment of the present invention is wired to a vehicle; Is a perspective view of a main part, and (B) is a front view.
FIG. 5 is a diagram of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Wire harness 12 U-turn part 13 Downward electric wire 14 Upward electric wire 15 Folding part 16, 16 'Corrugated tube 20-24, 23' Tape w Electric wire group X Engine room Y Car interior

Claims (3)

A wire harness that is routed from the engine room of the vehicle to the vehicle room through the through hole of the body panel,
A grommet is attached to a portion to be inserted into the through hole, and the grommet is attached to the through hole and a wire harness is routed in the vehicle interior.
At the wiring part on the engine room side close to the grommet mounting part, the wires forming the wire harness are turned downward and then U-turned upwards. Expose and insert the U-turn portion in a state housed in one corrugated tube, and tape-fix the upper end of the corrugated tube to a wire harness,
A wire harness for automobiles, wherein water that has entered the wire harness in the engine room is drained from the group of wires in the corrugated tube through the lower end opening of the corrugated tube by its own weight. 2. The automobile wire harness according to claim 1, wherein the wire group of the upwardly directed portion of the U-turn portion and the wire group of the wiring portion in the engine room excluding the U-turn portion are half-wrapped with tape to be waterproof. The automobile wire harness according to claim 1 or 2, wherein when the corrugated tube is a corrugated tube having a slit in which a slit extends in an axial direction, the outer periphery of the corrugated tube is half-wrapped with tape.

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