JPH07245841A - Water preventive structure of wire harness - Google Patents

Abstract

PURPOSE:To prevent water, which has penetrated from the tip of the armor material of a wire harness, from entering the inside. CONSTITUTION:A waterproof sheet 13 is wound, at a required interval to terminal mounts, around a plurality of cables W, where terminals to be connected to a connector 7 are attached to the tips, and butyl adhesive 14A, which is stuck beforehand along the edge of the top on terminal mounting side of the waterproof sheet 13 is bonded without space to the periphery of the cables, and also by the butyl adhesive 14A, the fellow edges on top side of the sheet 13 are bonded to each other in the condition of being wound. Besides, the fellow edges of the waterproof sheet are bonded in longitudinal direction by the butyl adhesive 14B being stuck to the waterproof sheet 13 in the longitudinal direction of the cables.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure of a wire harness for wiring in a water-exposed position such as an engine room of an automobile where water is liable to splash. In the case where the terminal is attached and the terminal is attached to the connector, and the exterior material is not attached up to the tip of the electric wire at the terminal attachment position, and water is generated from the part, it is possible to reliably prevent the water from being generated. To do.

[0002]

2. Description of the Related Art In a vehicle, a wire harness wired between an engine room or a tire house and a vehicle room is easily splashed with water on the engine room side and the tire house side. At the same time, a negative pressure is generated in the passenger compartment, and this negative pressure causes water that has infiltrated into the wire harness to reach the passenger compartment, causing corrosion on the connector connected to the passenger compartment and dripping water into the passenger compartment. Occur. Further, if there is a splice portion that connects the electric wires to each other in the wire harness, there is a problem that corrosion occurs in the connection terminal of the splice portion.

Various waterproof measures have been taken for the wire harness which is laid in the above-mentioned water-prone portion, for example, as shown in FIG.
The branch line 2 branched from the main line 1 is covered with a round tube 3 such as a vinyl tube, the main line 1 is wound with a tape, and further covered with a corrugated tube 4.
Further, a grommet 5 is attached to the wire harness W / H between the vehicle compartment side X and the engine room side Y, and the grommet 5 is attached to a through hole provided in the partition wall 6 so that the vehicle can be installed from the through portion of the wire harness. Prevents water from entering the room X.

The round tube 3 attached to the branch line 2 is
As shown in FIG. 7 (A), the terminal 6 is passed through from the tip end side and covered up to a position reaching the main line 1. At that time, since the terminal 6 attached to each electric wire W is larger than the electric wire W, the round tube 3 to be put through the terminal 6 must have an inner diameter larger than the sum of the diameters of the plural electric wires W to be passed inside. In order to smoothly pass the electric wire group, a material is used in which a gap is formed between the inner peripheral surface of the round tube 3 and the electric wire group. The length of the round tube 3 is set so that the tip 3a of the round tube 3 is located at a required distance S from the terminal 6. As shown in FIG. 7B, the spacing S is necessary for gripping the electric wire W when the terminal 6 is inserted into the connector 7 later, and the terminal 6 is dispersed in the terminal accommodating chamber of the connector 7. It is necessary for the insertion of the round tube, and the tip of the round tube cannot be positioned up to the position where it abuts the connecting portion with the connector.

As mentioned above, after the branch tube 2 is covered with the round tube 3, the connector 7 is attached to the terminal 6 protruding from the round tube 3. At this time, as mentioned above,
The gap C is inevitably formed between the connector 7 and the tip 3a of the round tube 3. In addition, as described above, the tape 5 is wound around the trunk line 1, further covered with the corrugated tube 4, and the trunk line side of the round tube 3 is put inside the corrugated tube 4 through the slit 4a of the corrugated tube 4, Prevents the occurrence of inundation from the branch.

[0006]

As described above, in a wire harness for wiring a water-exposed portion such as an engine room where water is likely to splash, a round tube 3 is attached to a branch line and a corrugated tube 4 is attached to a trunk line for waterproofing. As shown in FIG. 6, there is a gap C between the tip 3a of the round tube 3 and the connector 4, and the wire W to be inserted inside is provided in the opening of the tip 3a of the round tube 3. As described above, a gap is inevitably formed between the and, and, so to speak, the mouth of the round tube is open.

Therefore, water infiltrates into the inside of the round tube 3 through the opening of the tip of the round tube 3 and infiltrates into the passenger compartment through the main line 1 and reaches the connector connection portion in the passenger compartment. As a result, there is a problem that the connector connected to the passenger compartment side is corroded and water is dripped into the passenger compartment. Furthermore, since the main wire 1 of the wire harness is wound with a tape and is covered with a corrugated tube,
The splice portion on the main line 1 is often a non-waterproof splice as shown in FIG. Therefore, branch line 2
When the water from the water reaches the main line 1 and water is applied to the splice portion, there is a problem that the electric wire connecting terminal 8 in the splice portion is corroded.

The present invention has been made in view of the above problems. Instead of the round tube covering the branch line, an exterior material that does not create a gap with the electric wire is attached, and an exterior material of the electric wire and a connector attaching portion are provided. The purpose is to eliminate the occurrence of water ingress into the wire harness from the gap.

[0009]

In order to achieve the above object, the present invention provides a terminal mounting portion and a required space for a plurality of electric wires having a terminal to be connected to a connector at a tip thereof according to claim 1. A waterproof sheet is wrapped around the waterproof sheet, and a butyl-based adhesive that is pre-attached along the edge of the waterproof sheet on the terminal mounting side is adhered to the outer peripheral surface of the electric wire without any gaps. The end edges of the sheet are adhered to each other in a wound state by the butyl-based adhesive that is pre-attached to the waterproof sheet along the length direction of the electric wire. (EN) A waterproof structure for a wire harness, which is characterized in that it is adhered in the length direction.

It is preferable that the waterproof sheet is wound around the electric wire while sandwiching the electric wire and being laminated. (Claim 2) However, the invention is not limited to the above-mentioned pasting method, and may be spirally wound around the electric wire of the waterproof sheet.

In the waterproof structure in which the above-mentioned waterproof sheet is wound and the butyl-based adhesive which has been previously adhered to the waterproof sheet is adhered to the electric wire without a gap, since water is more likely to be generated than the connector mounting portion at the tip of the branch line, the wire harness It is preferable to apply the branch line branching from the main line. (Claim 3) However, the waterproof sheet is not limited to the branch line, and the waterproof sheet may be wound around the trunk line to be used as a waterproof structure for the trunk line.

A rectangular insulating resin sheet made of vinyl, polyethylene or polypropylene is used as the waterproof sheet, and the butyl adhesive is preliminarily attached along at least one side wound around the terminal side and one side orthogonal to the side. I'm wearing it. (Claim 4) However, the material that becomes the waterproof sheet is not limited to the resin, and any material having waterproofness, insulation and strength can be suitably used. Also, the butyl adhesive is not limited to being attached to the above two sides, and it may be attached to the four sides of the waterproof sheet or to the entire one side. The necessary waterproofing is provided and the sheet itself can be held in a state of being wrapped around the electric wire.

[0013]

According to the waterproof structure of the wire harness of the above-mentioned claim 1, even if the waterproof sheet is wound around the electric wire with a gap from the terminal mounting portion, the electric wire is adhered to the front end of the waterproof sheet by the butyl adhesive. Since there is no gap between the waterproof sheet and the waterproof sheet, it is possible to prevent water from entering the waterproof sheet from the tip of the waterproof sheet. In addition, since the waterproof sheet has its end edges adhered to each other along the length direction of the electric wire with a butyl-based adhesive, no water will be generated from the winding end of the waterproof sheet.

As described in claim 2, when the waterproof sheet is wound around the electric wire while sandwiching the electric wire, the waterproof sheets are pressed so as to adhere to each other. The adhesives can be firmly adhered to each other, and can be adhered to the outer peripheral surface of the electric wire without any gap, and the butyl-based adhesive can be filled into the gap between adjacent electric wires without any gap. Moreover, the cross-sectional area can be reduced by laminating them together.

As described in claim 3, when the waterproof sheet is wound around the branch line branching from the main line of the wire harness to form a waterproof structure, the water leakage conventionally generated from the connector mounting portion at the tip of the branch line is prevented. It can be surely prevented.
In particular, if all the branch lines constituting the wire harness have the waterproof structure, the entire wire harness can have the waterproof structure.

When a rectangular insulating resin sheet made of vinyl, polyethylene or polypropylene is used as the waterproof sheet as described in claim 4, it can be attached to the electric wire without waste and with good workability. Also,
If the butyl-based adhesive is attached in advance along one side that is wound around the terminal side of the waterproof sheet and one side that is orthogonal to the side, it is possible to achieve reliable waterproofing with the minimum necessary,
It is possible to prevent the cross-sectional area of the waterproof wire harness from increasing.

[0017]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. The wire harness 10 of FIG. 1 according to the present invention.
In the same manner as the wire harness shown in FIG. 6, the main wire 11 of the wire harness 10 is wired from the passenger compartment of the automobile through the upper part of the tire house into the engine compartment.
A part of the wire harness is shown in FIG. The wire harness 10 is provided with a branch line 12 branched from a trunk line 11, and an exterior material made of a waterproof sheet 13 is attached to the branch line 12 for waterproofing. As in the conventional case, the main line 11 is wound with a tape and is covered with the corrugated tube 4.

On the branch line 12, a waterproof sheet 13 made of rectangular vinyl chloride as shown in FIG.
The electric wire W of the book is sandwiched and folded in two to be stuck together. The waterproof sheet 13 extends from the branch end of the electric wire W (two electric wires W in the branch line of FIG. 1) forming the branch line 12 to the vicinity of the end of the terminal to which a terminal (not shown) is previously crimped. The waterproof sheet 13 is wound around. The space S (shown in FIG. 7) between the terminals is substantially the same as the conventional one, and a space is provided so that the terminal W can be inserted into the connector 7 by gripping the electric wire W protruding from the tip 13a of the waterproof sheet 13. ing.

As shown in FIG. 3, the waterproof sheet 13 has a side 13b on the inner side of the lamination, which is a terminal side, and one side 1 which is orthogonal to the side 13b and extends along the length direction of the electric wire W.
Butyl adhesive 14 (14A, 14B) having a predetermined width t1 and t2 is previously attached to 3c. Therefore, when the waterproof sheets 13 are stuck together with the electric wire W sandwiched therebetween and pressed so as to firmly adhere to each other, the tip 13a on the terminal mounting side is formed.
Then, as shown in FIG. 2 (A), the butyl-based adhesive 14A is adhered to the outer peripheral surfaces of the two electric wires W without any gap, and the butyl-based adhesive 14A is filled into the gap between the adjacent electric wires W. At the same time, the butyl-based adhesives 14A attached to the outside of the electric wires W are in a state of being adhered to each other. That is, there is no gap between the electric wire W and the waterproof sheet 3 where water will be generated by the butyl adhesive.

Further, as shown in FIG. 2B, from the terminal mounting side to the branch position with respect to the main line, the laminated edges of the waterproof sheet 13 are adhered to each other with the butyl adhesive 14B without any gaps. Water is not generated due to the bonded edges of the sheet 13. Figure 2 (B) above
The portion excluding the terminal mounting side tip shown in FIG. 2 may be adhered so that no gap is generated only at the laminated end of the waterproof sheet 13, and even if there is a gap between the waterproof sheet and the electric wire W, there is no problem of water infiltration, The sheet 13 and the electric wire W are not adhered by a butyl adhesive.

As described above, in the wire harness 10, after the waterproof sheet 13 is wound around the electric wire W of the branch line 12 by a machine or manually by an operator, the waterproof sheet 13 is wound.
The terminal of the tip of the electric wire W protruding from the tip of the waterproof sheet 13 is inserted into the connector 7 and assembled. Then, a tape (not shown in FIG. 1) is wound around the electric wire of the main line 11 connected to the branch line 12 to bind the electric wire, and then the corrugated tube 4 is externally covered. At that time, corrugated tube 4
The branch portion of the branch line 12 to which the waterproof sheet 13 is attached is housed inside the corrugated tube 4 through the slit 4a.

In the wire harness described above, in the branch line 12, there is a space C between the waterproof sheet 13 enclosing the electric wire W and the connector 7 attached to the tip of the wire. Even if an attempt is made, since no gap is formed between the waterproof sheet 13 and the electric wire W at the tip of the waterproof sheet 13 due to the butyl-based adhesive 14A, it is possible to reliably prevent generation of water from the tip. Further, also in the portion along the length direction of the branch line, since the edge edges of the prevention sheet 13 are adhered to each other with the butyl-based adhesive 14B without any gap, the occurrence of flooding from the adhered portion of the prevention sheet 13 is also prevented. It can be surely prevented.

The present invention is not limited to the above embodiment, and for example, as shown in FIG. 4 (A), the butyl adhesive 14 is provided on the four sides of the rectangular waterproof sheet 13 on the bonding surface side with respect to the waterproof sheet 13. The butyl adhesive on both ends of the terminal connection side and the branching side of the main line without any gaps, and at the same time along the length of the wire, attach the butyl adhesive. You can glue it. Furthermore, FIG.
As shown in (B), a butyl-based adhesive 14 is attached to the entire surface of the waterproof sheet 13 on the bonding surface side, and the branch line 12
The butyl-based adhesive may be adhered to the electric wire W without gaps throughout the electric wire W in the length direction.

However, as shown in FIG. 3, if the butyl adhesive is attached to the two sides of the waterproof sheet 13, the necessary portions can be bonded with the butyl adhesive, and the branch line 12
There is an advantage that waterproofing can be achieved without increasing the cross-sectional area.

Further, the waterproof sheet 13 is wound around the electric wire W in a spiral shape as shown in FIGS. May be. 5A and 5B show a state in which the waterproof sheet 13 shown in FIG. 3 is wound around the electric wire W.
Indicates the tip end portion on the terminal mounting side, and (B) indicates the other portion.

[0026]

As is apparent from the above description, when the waterproof structure of the wire harness according to claim 1 of the present invention is adopted, even if the waterproof sheet is wound around the electric wire with a gap from the terminal mounting portion, Since the butyl-based adhesive stuck to the tip side does not cause a gap between the electric wire and the waterproof sheet, it is possible to prevent water from being generated from the tip of the waterproof sheet into the waterproof sheet. In addition, since the waterproof sheet has its end edges adhered to each other along the length direction of the electric wire with a butyl-based adhesive, no water will be generated from the winding end of the waterproof sheet.

As described above, even if the waterproof sheet is attached to the terminal mounting portion of the electric wire with a space provided therebetween, the occurrence of water intrusion can be surely prevented, and thus the tip of the electric wire with the electric wire protruding from the waterproof sheet. The terminal attached to can be inserted into the connector with good workability and attached. Further, the work of winding the electric wire around the waterproof sheet is easier and the workability is better than the work of passing the electric wire through the conventional round tube.

Further, as described in claim 2 of the present invention, when the waterproof sheets are stuck together with the electric wire sandwiched therebetween, the waterproof sheets are pressed so as to be bonded to each other,
The butyl adhesive adhered to the inner surface of the sheet can be firmly adhered to each other, and can be adhered to the outer peripheral surface of the wire without any gap while keeping the cross-sectional area small, and the butyl adhesive can be applied to the gap between adjacent wires. Adhesive can be filled without gaps.

Further, as described in claim 3, when the waterproof sheet is wound around the branch line branching from the main line of the wire harness to form a waterproof structure, the water leakage that has conventionally occurred from the connector mounting portion at the tip of the branch line. Can be reliably prevented. In particular, if all the branch lines constituting the wire harness have the waterproof structure, the entire wire harness can have the waterproof structure. In particular, if the above waterproof structure is applied to a branch line of a wire harness that runs from the inside of the engine room of an automobile to the inside of the vehicle through the upper part of the tire house, it is possible to prevent the occurrence of water intrusion from the connector mounting portion at the end of the branch line. It is possible to prevent problems such as the water that has entered due to the negative pressure generated inside the vehicle interior being transmitted to the inside of the vehicle interior, causing corrosion in the connector inside the vehicle interior, and dripping water into the vehicle interior.
Further, since the intrusion of water from the branch line is reliably prevented, even if there is a non-waterproof splice portion on the main line portion, it is possible to prevent the problem that the terminals of the splice portion are corroded.

Further, as described in claim 4,
When a rectangular insulating resin sheet made of vinyl, polyethylene, or polypropylene is used as the waterproof sheet, it can be attached to the electric wire without waste and with good workability. Further, if the butyl-based adhesive is attached in advance along one side that is wound around the terminal side of the waterproof sheet and one side that is orthogonal to the side, it is possible to achieve reliable waterproofing with the minimum necessary. This has an advantage that the cross-sectional area of the structured wire harness can be prevented from increasing.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a wire harness of the present invention.

2A is a sectional view taken along the line AA of FIG. 1, and FIG. 2B is a sectional view taken along the line BB of FIG.

FIG. 3 is a development view of the waterproof sheet of FIG.

4A and 4B are development views showing a modified example of the waterproof sheet.

5 (A) and 5 (B) are cross-sectional views showing modified examples in which the waterproof sheet is wound by another method.

FIG. 6 is a perspective view of a main part of a conventional wire harness.

7A and 7B are process diagrams of the conventional wire harness shown in FIG.

FIG. 8 is a schematic view showing a splice portion provided on a trunk line of the wire harness of FIG.

[Explanation of symbols]

 W Electric wire 4 Corrugated tube 6 Terminal 7 Connector 10 Wire harness 11 Main line 12 Branch line 13 Waterproof sheet 13a Tip 14, 14A, 14B Butyl adhesive

Claims (4)

[Claims] 1. A waterproof sheet is wound around a plurality of electric wires having terminals to be connected to a connector attached at their tips with a required gap from a terminal attachment portion, and the waterproof sheet is attached to a tip edge of a terminal attachment side of the waterproof sheet. A butyl-based adhesive that has been previously adhered along with is adhered to the outer peripheral surface of the electric wire without any gap, and the butyl-based adhesive adheres the end edges of the sheet in a wound state, and A waterproof structure for a wire harness, characterized in that the edges of the waterproof sheet are adhered to each other in the length direction of the electric wire by a butyl-based adhesive that has been previously attached to the waterproof sheet along the length direction. 2. The waterproof structure according to claim 1, wherein the waterproof sheet is wound around the electric wire while sandwiching the electric wire between the waterproof sheet and the electric wire. 3. The waterproof structure according to claim 1, wherein a branch line of the wire harness is branched from a trunk line, and the waterproof sheet is wound around the branch line. 4. The waterproof sheet is a rectangular insulating resin sheet made of vinyl, polyethylene, and polypropylene, and the butyl adhesive is preliminarily attached along at least one side wound around the terminal side and one side orthogonal to the side. The waterproof structure according to claim 1, which is worn.