JP2008234974A - Drain wire water-cutoff method and drain wire water-cut-off structure of shielded wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-cutoff method and structure for a drain wire capable of making a water-cutoff treatment part slim, lowering cost for water-cutoff treatment, and endowed with high shielding performance. <P>SOLUTION: A drain wire and a core wire are drawn out outside from a peeling end at a tip of the shielded wire, a hot-melt tube is covered on a peeling end side of the drain wire, non-waterproof heat-shrinkable tube is covered on a tip side, and further, a waterproof heat-shrinkable tube is covered at least on a part from a rear end of the non-waterproof heat-shrinkable over to a rear end of the hot-melt tube. Later, the non-waterproof heat-shrinkable tube and the waterproof heat-shrinkable tube are put under heating treatment to be thermally shrunk, and at the same time, a hot-melt with the hot-melt tube dissolved is filled in immersion in strands of the drain wire. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a drain wire waterproofing method and a drain wire waterproof structure for a shield wire, and in particular, in a shield wire that is wired in a wet area such as an engine room of a vehicle, the drain wire stopped from the end of the shield wire. The water structure is slimmed down.

Of the electric wires routed in the automobile, shielded wires are used particularly in places where shielding against noise is required. For example, as shown in FIG. 6 (A), the shield wire 1 includes an insulation covered electric wire (core wire) 2 serving as a plurality of signal wires and a drain wire 3 for grounding. A wire formed by sequentially covering the electric wire 2 with a shield layer 4 and a sheath 5 made of an insulating resin material is used (Patent Document 1).
The drain wire 3 is made of a large number of conductive strands and is not covered with an insulating coating, and is in contact with the shield layer 4 made of a metal braided tube or metal foil.

  In order to attach such a shielded wire 1 to the connector housing, it is necessary to process the end of the shielded wire 1 as shown in FIG. That is, the sheath 5 and the shield layer 4 are peeled over about 80 to 200 mm, the exposed end of the covered electric wire 2 is further peeled, the terminal fitting 7 is crimped, and the terminal 8 is crimped to the drain wire 3 in the same manner. After processing, the terminals 7 and 8 are inserted into the connector housing to enable mechanical connection with the counterpart device.

  In the case of connecting a terminal to an electric wire terminal wired in an area to be watered such as an engine room of a vehicle and connecting the terminal to a connector, for example, in Japanese Patent Application Laid-Open No. 2001-167821 (Patent Document 2), exposure of a core wire is performed. A water-stop method is disclosed in which molding is performed with a high-viscosity sealing resin so as to cover a terminal connection portion including a portion.

  When connecting the shielded wire to equipment in the engine room in the flooded area, the drain wire that is not insulated is drawn from the end of the shielded wire, so that water enters the inside of the equipment through the drain wire. It will be. Therefore, as shown in FIG. 7, after the insulation-coated electric wire 9 is added to the end of the drain wire 3, the core wire 9a of the insulation-coated electric wire 9 is spliced, and a water-stopping agent such as silicon is applied to the splice location. The tape is wound.

However, the outer diameter of the water stop splice is increased by silicon, tape, or the like, leading to enlargement of the outer diameter of the harness. The water stopping method disclosed in Patent Document 2 has the same problem. Further, in the structure in which the insulation-coated electric wire 9 is spliced to the end of the drain wire 3, the drain wire is longer than the core wire, so that the drain wire needs to be bent, and the harness outer diameter is enlarged. In particular, due to the recent electrification of automobiles and the like, the number of shielded wires is expected to increase, and countermeasures against the enlargement of the water stop splice part of the drain line are becoming increasingly important.
Further, since the insulated coated electric wire 9 is spliced to the drain wire 3 and the shielded wire is connected to the equipment (for example, ECU), there is a problem in that the processing cost is increased and the cost is increased.
Furthermore, the peeled length of the shielded electric wire is a length (150 to 200 mm) necessary for the splicing process, and there is a problem that the shielding performance is lowered due to the increased peeled length.

JP 2002-208321 A Japanese Patent Laid-Open No. 2001-167821

  The present invention has been made in view of the above problems, and can reduce the water stop treatment location, reduce the cost of the water stop treatment, and provide a drain water stop method and drain water stop with high shielding performance. The challenge is to provide a structure.

In order to solve the above problems, the present invention draws a drain wire and a core wire from the peeled end of the shield wire tip,
Cover the hot melt tube on the peeled end side of the drain wire, and cover the non-waterproof heat shrinkable tube on the tip side,
Furthermore, covering the waterproof heat-shrinkable tube from at least the rear end of the non-waterproof heat-shrinkable tube to the rear end of the hot melt tube,
Thereafter, heat treatment is performed to heat-shrink the non-waterproof heat-shrinkable tube and the waterproof heat-shrinkable tube, and the hotmelt obtained by melting the hotmelt tube is infiltrated and filled between the strands of the drain wire. A drain wire waterproofing method for the shielded wire is provided.
The hot melt tube is a tube formed of a hot-melt adhesive, and has a cylindrical shape at a low temperature (normal temperature), but is heated and melted at a temperature of about 130 ° C.

According to the drain wire waterproofing method of the shield wire of the present invention, the drain wire itself is insulated with the non-waterproof heat shrinkable tube and the waterproof heat shrinkable tube. And since the hot melt which melted and solidified the hot melt tube was filled between the strands of the drain wire, even if the drain wire is flooded, it is possible to stop the flooding to the terminal side by the hot melt. .
As described above, in the present invention, the hot melt tube is covered with the drain wire, and the hot melt tube is melted and filled between the strands of the drain wire, so that the water-stopping agent is dropped onto the required portion of the drain wire. This is unnecessary, and the hot melt filling operation can be facilitated. Moreover, since the hot-melt melted by the waterproof shrinkable tube placed on the hot-melt tube is pressurized from the outer peripheral side during heating, the hot-melt can be easily permeated between the strands of the drain wire.
In addition, hot melt is filled between the strands of the drain wire at the position where the waterproof heat-shrinkable tube is covered, but the increase in the outer diameter of the water-stop portion is very small, and silicon is applied as in the conventional case. Compared to the water-stopping method in which the resin is molded with resin, the water-stopping location can be greatly reduced.

The outer diameter of the waterproof heat-shrinkable tube is larger than the outer diameter of the non-waterproof heat-shrinkable tube that does not have a water-stopper on the inner peripheral surface. Since it coat | covers, the enlargement of the drain wire by having coat | covered the waterproof heat shrinkable tube can be suppressed, and slimming can be achieved.
Further, by covering the drain wire with a non-waterproof heat-shrinkable tube to form a pseudo-covered electric wire, the conventional splice connection between the general electric wire and the drain wire becomes unnecessary. Thereby, member costs, such as an electric wire and a terminal, and processing cost can be reduced. Furthermore, since no splice connection is required, the length of the shield wire at the tip can be reduced to 40 mm, and the shield performance can be improved by shortening the skinning section.
In addition, by not connecting a general electric wire to the drain wire, the length of the drain wire and the core wire can be made the same, and it is not necessary to bend the drain wire, so that further enlargement of the harness can be suppressed and slimming can be achieved. it can.

  A non-waterproof heat-shrinkable tube is further covered on the skinned end side of the drain wire than the hot-melt tube, the hotmelt tube is positioned between two non-waterproof heat-shrinkable tubes, and at least the tip side non-waterproof It is preferable that the waterproof heat-shrinkable tube is covered from the rear end of the heat-shrinkable tube to the tip of the non-waterproof heat-shrinkable tube on the peeled end side, and the waterproof heat-shrinkable tube is covered over the entire hot melt tube.

  According to the above configuration, since the non-waterproof shrinkable tube is covered on both sides of the position where the hot melt is filled between the strands of the drain wire, and the waterproof heat shrinkable tube is covered over the entire hot melt filling position, the waterproof heat shrinkable tube is provided. The water-stopping agent applied to the inner peripheral surface can reduce water intrusion between the drain wires.

The drain wire is composed of a stranded wire obtained by twisting a plurality of strands. The drain wire is untwisted at the position where the hot melt tube is covered, and the hot melt melted by heating is infiltrated between the strands and filled. It is preferable.
According to the said structure, since the twist of the hot melt tube coating position of the drain wire is returned, the hot melt melted by heating can be easily penetrated between the strands and filled.

  Moreover, this invention provides the drain wire water stop structure of the shield wire manufactured by the said method.

Furthermore, the present invention provides a drain wire and a core wire drawn from the peeled end of the shield wire tip,
A non-waterproof heat-shrinkable tube that is heated and shrunk over the leading end of the drain wire drawn out;
Hot melt filled and solidified between the strands of the drain wire on the skinned end side of the non-waterproof heat shrinkable tube,
Provided is a drain wire waterproof structure for a shield wire, comprising a waterproof heat-shrinkable tube that is heated and shrunk at least from the rear end of the non-waterproof heat-shrinkable tube to the hot melt filling position. .

A waterproof rubber stopper is attached to the end of the drain wire, and the terminal is crimped.
Thus, if a rubber stopper is attached to the terminal connection side of the non-waterproof heat shrinkable tube, it is possible to completely prevent water from entering the terminal connection side end surface of the non-waterproof heat shrinkable tube.
In addition, since the drain wire is covered with a non-waterproof heat shrink tube and a waterproof heat shrink tube to create a pseudo-covered wire, it is harder to bend compared to the drain wire alone, and the drain wire end terminal is inserted into the connector. Thus, straightness can be maintained when connected to the mating terminal, and connector connection work can be facilitated.

The shielded wire is wired in a wetted region in the vehicle, and the terminal connected to the terminal of the drain wire is connected to a device arranged in the wetted region together with the terminal connected to the terminal of the core wire. The
For example, the terminal of the drain wire terminal is inserted and locked into the waterproof connector together with the terminal connected to the terminal of the other core wire, and the waterproof connector is fitted into the connector fitting portion of the ECU mounted in the engine room. Yes.
Thereby, it is possible to prevent water from penetrating into the device through the drain wire, and it is possible to prevent the device from occurring.

As described above, according to the present invention, the drain wire is covered with a non-waterproof heat-shrinkable tube to make the drain wire a pseudo-covered electric wire, and the hot melt tube is melted and solidified between the drain wires. Therefore, even if the drain wire is submerged, the hot melt can stop the submersion. Thus, hot melt is filled between the strands of the drain wire at the position where the waterproof heat-shrinkable tube is covered, but the increase in the outer diameter of the water-stop portion is very small. Compared to the water-stop method for molding, the water-stop location can be greatly reduced.
In addition, since the hot melt tube over the drain wire is melted and filled between the strands of the drain wire, there is no need to dripping a water-stopping agent on the drain wire, facilitating hot melt filling work. Can do.

  Furthermore, compared to the water-stopping process that spliced the insulation-coated electric wire used in the conventional water-stopping process to the drain wire and then molded the splice part with silicon etc., the number of parts can be reduced. Can also be reduced. In addition, the length of the sheath peeled from the end of the shielded wire does not require the length necessary for splicing (150 mm or more) and can be the shortest dimension that can be crimped and connected to the terminal. As a result, the shield A reduction in the shielding performance of the wire can be suppressed.

Embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of the present invention.
The shield wire 10 according to the present embodiment is wired in a wet area of an engine room of an automobile, and an end of the shield wire 10 is connected to a connector 30 and the connector 30 is disposed in the wet area. ) Is fitted into a connector housing portion of an ECU (not shown).
The drain wire drawn from the peeled terminal of the shield wire 10 is subjected to a water stop treatment.

As shown in FIG. 2, the shield wire 10 includes an insulation-coated electric wire 12 (hereinafter referred to as a core wire 12) that becomes two signal wires and a drain wire 11, and the drain wire 11 and the core wire 12 are connected to each other. The shield layer 13 and the sheath 14 made of metal foil are sequentially covered, and the drain wire 11 is brought into contact with the shield layer 13 to conduct.
The shield wire 10 cuts and peels the sheath 14 and the shield layer 13 with the shortest dimension L of about 40 mm from the tip, and draws the drain wire 11 and the core wire 12.

The drain wire 11 drawn out from the end of the shield wire 10 is formed of a stranded wire obtained by twisting a plurality of strands. As shown in FIG. 3, the drain wire 11 has a non-waterproof heat shrink on the end side and the peeled end side. The tubes 15A and 15B are covered and thermally contracted, and the hot melt tube 16 is heated and melted between the strands of the drain wire 11 between the non-waterproof heat shrinkable tubes 15A and 15B to fill and solidify. I am letting.
Further, the waterproof heat-shrinkable tube 17 is put on the drain wire 11 from the non-waterproof heat-shrinkable tube 15A on the terminal side to the non-waterproof heat-shrinkable tube 15B on the peeled end side so as to cover the entire filling position of the hot melt 16 ′. Shrink. A heat-meltable water-stopping agent 18 (hereinafter referred to as “water-stopper 18”) is applied in advance to the inner peripheral surface of the waterproof heat-shrinkable tube 17, and the water-stopper 18 is melted at the time of heat shrinkage. The hot melt 16 ′ is filled in the outer periphery on both the filling position and both axial sides thereof.
In addition, the drain wire 11 of the location filled with hot-melt 16 'returns the twisted wire so that the hot-melt 16' can easily penetrate between the strands.

  A rubber plug 21 is attached to the boundary portion between the tip of the non-waterproof heat shrinkable tube 15 </ b> A and the crimping portion of the terminal 20. The rubber plug 21 is also attached to the boundary portion between the other core wire 12 and the terminal 20.

Next, a water stopping method for the drain wire 11 having the water stopping structure will be described.
First, the shield wire 10 is cut from the tip, as described above, the sheath 14 and the shield layer 13 made of metal foil with the shortest dimension L, and so-called skinning is performed, as shown in FIG. The core wire 12 and the drain wire 11 are drawn out from the end of the shield wire 10 at the end.

Next, as shown in FIG. 4B, a non-waterproof heat shrink tube 15B made of an insulating resin, a hot melt tube 16, and a non-waterproof heat shrink tube 15A are passed through the drain wire 11 in this order.
Next, as shown in FIG. 4C, a waterproof heat-shrinkable tube 17 is covered so as to cover the entire hot melt tube 16 covered with the drain wire 11, and heat treatment is performed at once. By this heat treatment, the non-waterproof heat-shrinkable tubes 15A and 15B and the waterproof heat-shrinkable tube 17 are heat-shrinked, and hot-melt 16 'melted by the hot-melt tube 16 penetrates and fills the strands of the drain wire 11. Furthermore, the water-stopping agent 18 of the waterproof heat-shrinkable tube 17 is melted and filled in the hot melt filling position and the outer circumferences on both sides thereof.
Next, a tape is wound around the peeled end of the shield wire 11 surrounded by a broken line in FIG. 1 to protect the bare drain wire 11.

  After the water stop treatment described above, a waterproof rubber stopper 21 is placed on the front end side boundary position of the non-waterproof heat-shrinkable tube 15 </ b> A covering the front end side of the drain wire 11, and the terminal 20 is crimped and connected to the front end of the drain wire 11.

  As shown in FIG. 1, a rubber plug 21 is also attached to the ends of the two core wires 12, and the terminals 20 are crimped and connected.

According to the above-described configuration, even if water is generated between the strands of the drain wire 11, the water can be blocked by the hot melt 16 ′ filled between the strands.
In this way, hot melt 16 'is filled between the strands of the drain wire 11, but the increase in the outer diameter of the water stop portion is insignificant, compared to a water stop method in which silicon is applied or molded with resin. Thus, the water stop point can be significantly slimmed.
In addition, since the hot melt tube 16 covered with the drain wire 11 is melted and filled between the strands of the drain wire 11, there is no need to add a water-stopping agent to the drain wire 11, and the hot melt 16 'is filled. Work can be facilitated.

Furthermore, by covering the drain wire 11 with the non-waterproof heat-shrinkable tube 15 to form a pseudo electric wire, the splice connection between the drain wire 11 and the insulation-coated electric wire becomes unnecessary. Accordingly, the material cost and the processing cost can be reduced, and the sheath stripping length L of the shield wire 10 can be set to 40 mm necessary for terminal crimping, and the shielding performance of the shield wire 10 can be reduced by minimizing the stripping length L. Can be greatly suppressed.
Moreover, since the splice connection between the drain wire 11 and the insulated wire is not required, the length of the drain wire 11 and the core wire 12 can be made uniform, and the drain wire 11 and the core wire 12 are connected to the same connector 30. However, there is no extra length in the drain line 11. Thereby, it is not necessary to bend the drain wire 11, and further, the enlargement of the harness can be suppressed and slimmed.

FIG. 5 shows a second embodiment of the present invention.
In this embodiment, the non-waterproof heat-shrinkable tube 15 </ b> B closer to the skinned end than the hot melt tube 16 is not covered with the drain wire 11, and the rear end of the hot melt tube 16 is abutted against the skinned end of the sheath 14. Yes. The waterproof heat-shrinkable tube 17 is covered from the front end to the peeled end slightly from the rear end of the non-waterproof heat-shrinkable tube 15 </ b> A that covers the leading end side of the drain wire 11.
As in the first embodiment, the non-waterproof heat-shrinkable tube 15A and the waterproof heat-shrinkable tube 17 are thermally contracted by heat treatment, and the hotmelt tube 16 is melted so that the hotmelt 16 ′ is interposed between the strands of the drain wire 11. Infiltrate and fill.

According to the above configuration, the drain wire 11 can be water-stopped as in the first embodiment, and the number of parts and work man-hours can be further reduced by eliminating the need for the non-waterproof heat-shrinkable tube 15B.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

It is drawing which shows the whole shield line by which the drain line of 1st Embodiment of this invention was water-stopped. It is a perspective view of a shield wire. (A) is a principal part expanded sectional view of a water stop process part, (B) is an AA sectional view, (C) is a BB sectional drawing. (A)-(C) are drawings which show the water stop method of a drain wire. It is drawing which shows the shield wire of 2nd Embodiment. It is drawing which shows a prior art example. It is drawing which shows another prior art example.

Explanation of symbols

10 Shielded wire 11 Drain wire 12 Insulated coated wire (core wire)
13 Shield layer 14 Sheath 15A, 15B Non-waterproof heat shrinkable tube 16 Hot melt tube 16 'Hotmelt 17 Waterproof heat shrinkable tube 18 Water stop agent 20 Terminal 21 Rubber stopper

Claims (6)

Pull the drain and core wires out of the peeled end of the shield wire,
Cover the hot melt tube on the peeled end side of the drain wire, and cover the non-waterproof heat shrinkable tube on the tip side,
Furthermore, covering the waterproof heat-shrinkable tube from at least the rear end of the non-waterproof heat-shrinkable tube to the rear end of the hot melt tube,
Thereafter, heat treatment is performed to heat-shrink the non-waterproof heat-shrinkable tube and the waterproof heat-shrinkable tube, and the hotmelt obtained by melting the hotmelt tube is infiltrated and filled between the strands of the drain wire. A drain wire waterproofing method for the shielded wire.   A non-waterproof heat-shrinkable tube is further covered on the skinned end side of the drain wire than the hot-melt tube, the hotmelt tube is positioned between two non-waterproof heat-shrinkable tubes, and at least the tip side non-waterproof The waterproof heat-shrinkable tube is covered from the rear end of the heat-shrinkable tube to the tip of the non-waterproof heat-shrinkable tube on the peeled end side, and the waterproof heat-shrinkable tube is covered over the entire hot melt tube. Drain wire waterproofing method for shielded wire.   The drain wire is composed of a stranded wire obtained by twisting a plurality of strands. The drain wire is untwisted at the position where the hot melt tube is covered, and the hot melt melted by heating is infiltrated between the strands and filled. A drain wire waterproofing method for a shielded wire according to claim 1 or 2.   A drain wire waterproof structure for a shielded wire manufactured by the method according to any one of claims 1 to 3. A drain wire and a core wire drawn from the peeled end of the shield wire tip,
A non-waterproof heat-shrinkable tube that is heated and shrunk over the leading end of the drain wire drawn out;
Hot melt filled and solidified between the strands of the drain wire on the skinned end side of the non-waterproof heat shrinkable tube,
A drain wire waterproof structure for a shield wire, comprising a waterproof heat-shrinkable tube that is heat-shrinked at least from the rear end of the non-waterproof heat-shrinkable tube to the hot melt filling position.   The drain wire waterproof structure for a shielded wire according to claim 4 or 5, wherein a waterproof rubber plug is attached to the end of the drain wire, and the terminal is connected by crimping.

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