JP3490415B2 - Wiring harness branch section protection 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 wire harness in which a plurality of electric wires are bundled, and in particular, a branch part of a wire harness having a branch part in which some of the electric wires branch and extend outward. Regarding protection structure.

[0002]

2. Description of the Related Art In a wire harness in which a plurality of electric wires are bundled, when a part of the electric wires has a branching portion which branches and extends outward, the branching portion is arranged in the vicinity. When the member comes into contact with the member, there is a possibility that disconnection may occur at the branch portion due to this contact. In particular, in wire harnesses used in passenger cars that use metal frames and brackets, these frames and brackets have many parts that affect the electric wires, such as burrs, edges, and various welding marks. The environment is prone to For this reason, conventionally, a wire has been used to make a detour to avoid such a portion.

However, in some cases, due to the arrangement space, it may not be possible to run a wire so as to avoid the above-mentioned portion, and if the degree of freedom for passing a wire is low in this way, for example, Japanese Patent Laid-Open No. 11-215640. As shown, a protector is provided so as to cover the wire harness, and for electric wires that branch from the wire harness and extend laterally, a structure in which a guide piece projects from the protector and is protected by this guide piece, As disclosed in Japanese Unexamined Patent Publication No. 2000-166054, a structure in which a wire harness is covered with a corrugated tube and an electric wire branched from the wire harness and extended laterally is protected by an annular member fitted to the corrugated tube. Etc. have been adopted.

[0004]

However, in any of the electric wire protection structures described in these publications, a dedicated protection member matching the position and shape of the branch portion is required, which causes an increase in cost. was there.

Therefore, according to the present invention, even when the degree of freedom for passing wires is low, the reliability against disconnection is ensured, and the dedicated protective member is not required, thereby significantly reducing the cost. An object of the present invention is to provide a wire harness branching portion protection structure that can be used.

[0006]

In order to achieve the above object, the branch portion protection structure for a wire harness according to claim 1 of the present invention is a trunk line on one side connected to a meter side harness.
And a trunk line on the other side, a part of the electric wire (for example, the branch branch line 19 in the embodiment) branches as a branch branch line and extends outward (for example, the branch part 21 in the embodiment). have a, the branches line instrument panel center frame
Above the edge of the
A structure for protecting the branched portion of the wire harness (for example, the wire harness 14 in the embodiment) that is guided to the outside and connected to the air-conditioner-side wire harness, and has a cushioning property (for example, the embodiment). The tape material (for example, the cushion tape 22 in the embodiment) provided with the cushion layer 31 in the above embodiment and the wear resistant coating layer having the wear resistance (for example, the wear resistant coating layer 32 in the embodiment) is wound. By doing so, the branch portion is covered with the tape material, and the trunk line on the other side is covered.
Attach it to the instrument panel center frame and attach the branch
It is characterized by being attached to the instrument panel center frame .

In this way, the branch portion of the wire harness is
Since a tape material provided with a cushion layer having a cushioning property and a wear-resistant coating layer having wear resistance is wound and protected by the tape material, a metal plate or the like in which this branch portion is arranged in the vicinity Even if it contacts the member, it is possible to prevent the disconnection occurring at the branch portion. Therefore, even when the degree of freedom for passing the wire is low, the reliability against the disconnection can be ensured. Moreover, since the branch portion of the wire harness is protected by this tape material by winding a tape material having a cushion layer having cushioning properties and an abrasion resistant coating layer, it is highly versatile and dedicated. No need for a protective member. Therefore, the cost can be significantly reduced.

According to a second aspect of the present invention, there is provided a wire harness branching portion protection structure, wherein the wear-resistant coating layer is a polyethylene laminate layer.

As described above, since the wear resistant coating layer is the polyethylene laminate layer, it is possible to obtain sufficient wear resistance at a lower cost. Therefore, it is possible to reliably prevent the disconnection that occurs at the branch portion and further reduce the cost.

[0010]

[0011]

The wire harness branching part protection structure according to claim 3 of the present invention is the wire harness branching structure according to claim 1 or 2 , wherein the cushion layer is a non-woven fabric layer (for example, the non-woven fabric layer 33 in the embodiment) and an adhesive layer. (For example, the adhesive layer 34 in the embodiment) is laminated.

Thus, since the cushion layer is formed by laminating the non-woven fabric layer and the adhesive layer, sufficient cushion performance can be obtained. Therefore, it is possible to reliably prevent the disconnection that occurs at the branch portion, and it is possible to secure higher reliability against the disconnection.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A branch portion protecting structure for a wire harness according to an embodiment of the present invention will be described below with reference to FIGS.

The wire harness branching portion protecting structure of the present embodiment is applied to the wire harness branching portion arranged in the vicinity of the mounting portion of the instrument panel of a passenger car.

FIG. 1 shows the vicinity of a mounting portion of an instrument panel of a passenger car. In FIG. 1, reference numeral 11 indicates
Reference numeral 12 denotes a steering hanger beam arranged along the left-right direction, reference numeral 12 denotes an instrument panel center frame, reference numeral 1
Reference numeral 3 denotes an instrument panel upper bracket connected to the upper portion of the instrument panel center frame, and reference numeral 14 denotes a wire harness arranged substantially along the steering hanger beam 11, respectively. The instrument panel center frame 12 and the instrument panel upper bracket 13 are shown. An instrument panel (not shown) is attached.

The wire harness 14 includes a trunk line 16 on one side.
Is connected to a meter side harness (not shown), and the trunk line 17 on the other side is branched into a plurality of branch branch lines 18 to be connected to an assistant door harness, a floor harness, a radio / navigation device, and the like. A branch branch line 19 that branches from between the trunk lines 16 and 17 is connected to the air-conditioner-side wire harness.

In the present embodiment, a branch portion 21 in which a branch branch wire 19 formed of a plurality of electric wires is branched and extends outward for connection to the air-conditioner-side wire harness.
The branch portion protection structure of the present embodiment is applied to.

That is, as shown in FIG. 2, at least a branch portion 21 constituted by both branch lines 19 side of both trunk lines 16 and 17 of the wire harness 14 and both trunk lines 16 and 17 side of the branch branch line 19 is provided. , A long cushion tape (tape material) 22 so as to cover all of these outsides without gaps.
Is affixed by being wound with the adhesive layer on the inside.
Are covered and protected.

Specifically, the two main lines 16 and 17 of the wire harness 14 are PV on the outside on the side of each branch branch line 19.
The cushion tape 22 is covered with protective tubes 24 and 25 such as a C tube, and the cushion tape 22 includes the branch portion 21 so as to cover substantially the entire length of the main line 16 including the protective tube 24 and the branch of the protective tube 25 of the main line 17. A part of the branch line 19 side and both trunk lines 16 and 17 between the protection tubes 24 and 25
And a substantially full-length range of the branch branch line 19 that branches outward from the trunk lines 16 and 17 and extends (the cushion tape 22 has a winding range shown in FIG.
And shown in bold in FIG. 2). 1 and 2, the trunk lines 16 and 17 and the branch line 1
Although the cushion tape 22 and the protective tube 25 are shown in a partially broken manner in order to illustrate 9, the cushion tape 22 and the protective tube 25 are actually present in this portion as well.

Here, the cushion tape 22 of the main line 16
Band clips 27, 28, and 29 are attached at predetermined positions on the outer side of, the outer side of the protective tube 25 of the main line 17, and the outer side of the cushion tape 22 of the branch branch line 19, respectively.

The cushion tape 22 has a cushion layer 31 having a cushioning property, as shown in the cross section of FIG.
And a wear-resistant coating layer 32 having wear resistance, and the cushion layer 31 is formed by laminating a non-woven fabric layer 33 and an adhesive layer 34 for sticking. Here, a PE (polyethylene) laminate layer is used as the abrasion resistant coating layer 32, and the adhesive layer 3 of the nonwoven fabric layer 33 is used.
4 is formed on the opposite side .

Then, the wire harness 14 in the state in which the branch portion 21 is covered with the cushion tape 22 as described above.
Is attached to the instrument panel upper bracket 13 with the band clip 27 wound around the main line 16 along the steering hanger beam 11.
Band clip 2 with its trunk line 17 wrapped around it
It attaches to the instrument panel center frame 12 by 8.

Further, the branch line 19 is cut and raised above the instrument panel center frame 12 to form an edge portion 3.
The instrument panel center frame 1 is guided by the band clip 29, which is guided downwards so as to exceed 6 and is wound around this.
Attach it to 2 and connect the tip side to the wire harness on the air conditioner side.

In the wire harness 14 thus mounted, the branch portion 21 having a structure in which the branch branch line 19 extends from between the trunk lines 16 and 17 has the instrument panel center frame 1
Since it is arranged on the edge portion 36 cut and raised above 2, the branch portion 21 may come into contact with or rub against the edge portion 36 due to vibration or the like during traveling. The portion 21 includes the cushion layer 31 having the above-mentioned cushioning property and the wear-resistant coating layer 3 having wear resistance.
Since the cushion tape 22 provided with 2 and 3 is wound, it is protected by this cushion tape 22.

As described above, according to this embodiment, the branch portion 21 of the wire harness 14 is provided with the cushion layer 31 having the cushioning property and the wear-resistant coating layer 32 having the wear resistance. Since the cushion tape 22 is protected by winding the tape 22,
Even if the branch portion 21 comes into contact with the edge portion 36 of the instrument panel center frame 12 arranged in the vicinity thereof, it is possible to prevent disconnection that occurs in the branch portion 21. Therefore, even in the case where the wire is not allowed to avoid the edge portion 36 and the degree of freedom for the wire connection is low, the reliability against the wire breakage can be ensured.

Moreover, by wrapping the cushion tape 22 having the cushion layer 31 having cushioning property and the abrasion resistant coating layer 32 having abrasion resistance, the branch portion 21 is protected by this cushion tape 22. Therefore, the versatility is high and a dedicated protective member is unnecessary. Therefore, the cost can be significantly reduced.

Further, since the abrasion resistant coating layer 32 is a polyethylene laminate layer, sufficient abrasion resistance can be obtained at a lower cost. Therefore, this branch portion 21
It is possible to reliably prevent the disconnection of the wire, to ensure higher reliability against the disconnection, and to further reduce the cost.

Further, the JIS C of the wear-resistant coating layer 32 is
The abrasion resistance test result according to 3406 is 309 cm to 42.
Since it is 2 cm, necessary and sufficient abrasion resistance can be obtained. Therefore, it is possible to reliably prevent the disconnection that occurs in the branch portion 21 with necessary and sufficient performance, ensure higher reliability against the disconnection, and further reduce the cost.

In addition, the cushion layer 31 is the nonwoven fabric layer 3
Since 3 and the adhesive layer 34 are laminated, sufficient cushioning performance can be obtained. Therefore,
It is possible to reliably prevent the disconnection occurring in the branch portion 21, and it is possible to secure higher reliability against the disconnection.

[0031]

As described in detail above, the first aspect of the present invention
According to the branch part protection structure of the wire harness described above, the branch part of the wire harness is wound by winding a tape material including a cushion layer having a cushioning property and a wear-resistant coating layer having wear resistance. Since it is protected by the tape material, even if the branch portion comes into contact with a member such as a metal plate disposed in the vicinity thereof, it is possible to prevent disconnection that occurs at the branch portion. Therefore, even when a wire that avoids a member such as a metal plate cannot be run and the degree of freedom for running the wire is low, reliability against disconnection can be ensured. Moreover, since the branch portion of the wire harness is protected by this tape material by winding a tape material having a cushion layer having cushioning properties and a wear resistant coating layer having wear resistance, It has high performance and does not require a dedicated protective member. Therefore, the cost can be significantly reduced.

According to the branch portion protecting structure of the wire harness of the second aspect of the present invention, since the abrasion-resistant coating layer is the polyethylene laminate layer, sufficient abrasion resistance can be obtained at a lower cost. Therefore, it is possible to reliably prevent the disconnection that occurs at the branch portion and further reduce the cost.

[0033]

According to the branching part protection structure of the wire harness of the third aspect of the present invention, since the cushion layer is formed by laminating the non-woven fabric layer and the adhesive layer, sufficient cushion performance can be obtained. . Therefore, it is possible to reliably prevent the disconnection that occurs at the branch portion, and it is possible to secure higher reliability against the disconnection.

[Brief description of drawings]

FIG. 1 is a perspective view showing the vicinity of a mounting portion of an instrument panel of a passenger car to which a wire harness branching portion protection structure according to an embodiment of the present invention is applied. A part is broken and shown.

FIG. 2 is a perspective view showing a wire harness to which a branching portion protection structure for a wire harness according to an embodiment of the present invention is applied, in which a cushion tape and a protection tube are partially cut away.

FIG. 3 is an enlarged cross-sectional view of a cushion tape used in the branch portion protection structure for the wire harness according to the embodiment of the present invention.

[Explanation of symbols]

14 wire harness 21 Branch 22 Cushion tape (tape material) 31 cushion layer 32 Wear-resistant coating layer 33 Nonwoven layer 34 Adhesive layer

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Claims (3)

(57) [Claims] 1. The one side connected to the meter side harness
From the trunk line to the other side, some of the wires branch
To have a branch portion extending outwardly diverge, the branches
The line was cut and raised above the instrument panel center frame.
The air conditioner side wa
A protective structure for the branch portion of a wire harness connected to an ear harness, comprising winding a tape material comprising a cushion layer having cushioning properties and a wear-resistant coating layer having wear resistance, the tape being wound. together when formed by coating the bifurcation by wood
The other side of the main line to the instrument panel center frame.
Attach the branch wire to the instrument panel center frame
A protective structure for the branch part of the wire harness that is characterized by the following. 2. The structure for protecting a branched portion of a wire harness according to claim 1, wherein the wear-resistant coating layer is a polyethylene laminate layer. Wherein the cushion layer, according to claim 1 or 2, characterized in that formed by laminating a nonwoven fabric layer and adhesive layer
Branch wire protection structure for the described wire harness.