JP2011065911A - Shield wire having water-stopping section and method for forming water-stopping section of shield wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-stopping section which is excellent on water-stopping performance of a shield wire and hardly enlarges its outer diameter. <P>SOLUTION: In the shield wire 1 in which a plurality of core wires 2 are covered with shield layers 4 and the shield layer is covered with a sheath 5 made of an insulating resin outer cover, an intermediate cut 11 of the sheath 5 is set at a position separated at a designated dimension from a cutting position P1 for cover-peeling to a sheath remaining side, a melted water-stopping agent 15 is filled up from the intermediate cut to inside the shield wire, and an adhesive tape 12 with a narrow width is wound at half-lapped winding so as to cover an outer peripheral surface of the sheath where the intermediate cut is arranged, or an adhesive tape with a wide width is wound around the outer peripheral surface of the sheath. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

   The present invention relates to a shielded electric wire having a water stop and a method for forming the water stop of the shielded electric wire, and more particularly, a shielded electric cable routed from a water immersion area of a vehicle to a non-water immersion area such as a passenger compartment is shielded in the water immersion area. The water stop part which interrupts | blocks that the water which penetrate | invaded in the electric wire penetrates to the terminal side of a non-immersed area | region is provided.

  Among electric wires arranged in an automobile, shielded electric wires are used particularly in an arrangement region where shielding against noise is required. As shown in FIG. 6 (A), a shielded electric wire 100 is formed by covering a core wire 102 made of a plurality of insulated coated wires and a ground drain wire 103 with a shield layer 104 made of a metal foil or a metal mesh tube, The shield layer 104 is covered with a sheath 105 made of an outer layer of an insulating resin layer (see Japanese Patent Application Laid-Open No. 2002-208321).

As shown in FIG. 6 (B), the shielded electric wire 100 usually has terminal fittings 107 and 108 connected to both ends by crimping, and these terminal fittings 107 and 108 are inserted into connectors 109A and 109B. It fits into the connector housing, or is fitted and connected to a connector of another electric wire end.
At both ends of the shielded electric wire 1, the sheath 105 and the shield layer 104 are peeled over about 80 to 200 mm, and the exposed end of the core wire 102 is further peeled to crimp the terminal fittings 107 and 108. .

In the shielded electric wire 100, there are voids between the core wires 102, between the core wires 102 and the shield layer 104, and between the shield layer 104 and the sheath 105. Therefore, when the terminal to which the terminal fitting of the shielded electric wire 100 is connected is located in the flooded area, a waterproof measure is taken such that the connector connected to the terminal fitting is a waterproof connector.
However, there is a possibility that water is transmitted to the inside of the shielded electric wire 100 through the gap opened at the peeled end on the flooded region side, and the water is generated on the terminal side connected to the other end of the shielded electric wire 100. When the other end of the shielded electric wire 100 is wired in the non-water-immersed region, the terminal of the terminal is inserted into the non-waterproof connector, so that the water from the water-immersed region side of the shielded wire 100 reaches the terminal on the non-water-immersed region side. It is necessary to stop the water before.

  7A and 7B, a waterproofing agent 120 made of silicone is injected at the peeled position P of the shielded electric wire 100, and water is stopped in the gap of the shielded electric wire 100. In some cases, the water stop portion 122 is provided by filling the agent 120 and then winding the butyl pad 121 having a water stop function around the outer periphery of the core wire 102 exposed from the outer periphery of the sheath 105 with the peeling position P interposed therebetween. Many. The thickness of the butyl pad 121 is about 1.5 mm to 3 mm.

JP 2002-208321 A

When the water stop part 122 shown in FIG. 7 is provided, since the butyl pad 121 is thick, the outer diameter of the water stop part 122 is enlarged, and a wire harness in which a sensor system circuit having a large number of shielded electric wires 100 overlaps. Then, there exists a problem which this wire harness cannot accommodate in the corrugated tube of exterior material.
Moreover, if the water stop agent is cured at the cutting position of the sheath 105 of the shielded electric wire 100 to form the water stop portion, the water stop portion may be destroyed by thermal shock or vehicle vibration. In particular, due to the difference in thermal contraction rate between the sheath 105 and the core wire 102, there is a possibility that the water stop portion is displaced. This deviation increases due to the thermal shock and vehicle vibration, and there is a possibility that the water stoppage cannot be maintained.

  The present invention has been made in view of the above problems, and does not enlarge the water stop portion, prevents the water stop portion from being destroyed by thermal shock or vehicle vibration, and can reliably maintain the sealing performance. It is an object to provide a shielded electric wire provided with

In order to solve the above problems, as a first invention, a shielded wire in which a plurality of core wires are covered with a shield layer, and the shield layer is covered with a sheath of an insulating resin layer,
The shield layer and sheath are peeled off at the terminal side of the shielded wire to expose the core wire, and there is an intermediate cut in the sheath at a position away from the skinned cutting position to the sheath remaining side by a required dimension. A thin adhesive tape is half-wrapped or widened to cover the outer peripheral surface of the sheath provided with the intermediate cut and filled with a water-stopping agent melted into the shielded electric wire from the intermediate cut. Provided is a shielded electric wire having a water stop portion, characterized in that the tape is wound around.
The intermediate cut may be a single slit having a required dimension continuous in the axial direction, or may be an elongated elliptical cut having a long axial direction. In the case of a slit, the water stop agent may be injected by expanding the slit.

Further, as a second invention, a shielded electric wire in which a plurality of core wires are covered with a shield layer, and the shield layer is covered with a sheath of an insulating resin layer,
The shield layer and the sheath are peeled off at the terminal side of the shielded wire to expose the core wire, and the sheath on the sheath residual side has a terminal notch from the skinned cutting position. The shield wire is filled with a molten water-stopping agent, and a thin adhesive tape is half-wrapped or a wide adhesive tape is sushi-wrapped from the outer peripheral surface of the sheath provided with the terminal cut to the cutting position. The shield electric wire provided with the water stop part characterized by this is provided.
The terminal incision may be a single slit having a prescription dimension continuous in the axial direction or a V-shaped incision. In the case of a slit, the water stop agent may be injected by expanding the slit.

As described above, in the first invention, the sheath is cut at a position away from the cutting position where the sheath is peeled off, and a molten water-stopping agent is injected into the sheath from the intermediate cut. .
When the shield layer is a metal mesh wire, it is not necessary to make a cut in the shield layer, and the molten water-stopper injected from the sheath cut may penetrate the gap on the core wire side through the shield layer mesh wire. it can. When the shield layer winds the metal foil tape without any gaps, the shield layer is also cut simultaneously with the cutting of the sheath.

The pressure-sensitive adhesive tape used in the present invention is a thin-walled tape such as a vinyl chloride tape, with a pressure-sensitive adhesive applied on one side, and has a wall thickness of about 0.1 mm to 0.2 mm. The thickness is about 1/10 of the thickness of a butyl pad of 1.5 mm to 3 mm, and the finished outer diameter is reduced to about 30 to 40%.
When a narrow adhesive tape is used as the adhesive tape, it may be half-wrapped, and when a wide adhesive tape is used, it may be a sushi roll. In any case, no gap is formed between the adhesive tapes in the wound area of the adhesive tape.

As described above, instead of covering the filling portion of the water-stopping agent with a butyl pad, the outer diameter of the water-stopping portion can be reduced by covering with a thin adhesive tape.
In addition, a water-stopping agent is injected into the sheath from the notch surrounded by the adhesive tape, and in the sheath, the gap between the core wires, the gap between the core wire and the shield layer, and the gap between the shield layer and the sheath It penetrates the injected water-stopping agent.
As described above, the water-stopping agent penetrates into the space between the sheath, the shield layer and the core wire and hardens on the inner side of the sheath of the shielded wire, not on the exposed core wire side. A water part is provided, and the water stop part is not exposed to the outer surface.
Therefore, even if cracks enter the cured water sealant due to the difference in shrinkage between the core wire and sheath in the thermal shock, it prevents the cured water sealant from peeling off and degrading the water stop performance. can do.
Moreover, since the total price of the pressure-sensitive adhesive tape and water-stopper used in the present invention is 80% to 70% of the butyl pad, the cost can be reduced.

  Examples of the water stopping agent used in the present invention include silicone and urethane acrylate (UV). In particular, a low viscosity silicone having a viscosity of about 4 to 6 Pa · s is preferably used in order to improve the permeability into the voids during filling.

  The number of the core wires is 2 to 6, and the dimension from the skinned cutting position to the exposed tip of the core wire is about 80 mm to 200 mm. Thus, it is better that the exposed area of the core wire is short in terms of the shielding function, but if the above-described dimensions are exposed, a terminal metal fitting is crimped to the end of the core wire, and a dimension capable of inserting and locking the terminal metal fitting to the connector is provided. Obtainable.

  The shielded electric wire of the present invention is routed in a vehicle, and the terminal side provided with the water stop portion is routed in the vehicle interior of the non-immersed area, and the terminal connected to the terminal on the opposite side is disposed in the flooded area. It is most preferably used in the case where water entering from the side of the flooded area is blocked by the water stop portion.

As a third invention, there is provided a method for forming a water stop portion of the shielded electric wire according to the first and second inventions. The method
At the end of the shielded wire, the shield layer and the sheath are peeled off to expose the core wire,
Then, the terminal cut or intermediate cut is made in the sheath,
Next, the shielded electric wire is horizontally arranged, and the viscosity of 3 to 7 Pa. s low-viscosity silicone is injected into the terminal cut or intermediate cut,
Next, the method includes a method for forming a water stop portion of a shielded wire in which the adhesive tape is wound so as to cover the terminal cut or the intermediate cut.

  Thus, when an upward cut is provided in the sheath with an opening on the upper surface and the water-stopping agent is injected from the cut, the water-stopper is stored inside the sheath, and the injected water-stopper can be prevented from dripping down. Therefore, a fixed amount of water stopping agent can be supplied at a time, and workability can be improved.

As described above, in the shielded electric wire of the present invention, the water-stopping portion filled with the water-stopping agent is covered with a thin adhesive tape rather than a thick butyl pad, so that enlargement of the water-stopping portion can be suppressed. . Therefore, in a wire harness in which a large number of shielded electric wires are converged, even if the water stop portion is concentrated, extreme enlargement can be prevented and the exterior can be covered with a corrugated tube.
Further, a cutout is provided inside the sheath on the sheath remaining side across the cutting position of the sheath, and a molten water-stopping agent is injected and cured, and the cutout is covered with the adhesive tape to provide a waterstop portion. . As described above, since the waterproofing agent is provided inside the sheath of the shielded wire, the waterproofing part provided inside the sheath remaining side is not displaced or destroyed by thermal shock or vehicle vibration, and the waterproofing performance is maintained. Can be increased.
Furthermore, when the water-stopping agent is injected horizontally with the notch provided in the sheath facing upward, the water-stopping agent can be stored inside the sheath, so that the water-stopping agent can be injected efficiently and at the same time to increase productivity. be able to.

(A) is sectional drawing of a shielded electric wire, (B) is the schematic which shows the wiring position in the vehicle of a shielded electric wire, (C) is an enlarged view which shows the seal peeling position of the terminal of a shielded electric wire. (A)-(D) are drawings which show the formation process of the water stop part of 1st Embodiment. It is sectional drawing of the water stop part of the shield electric wire of 1st Embodiment. It is drawing which shows the modification of 1st Embodiment. (A)-(C) are drawings which show the formation process of the water stop part of 2nd Embodiment. A prior art example is shown, (A) Sectional drawing of a shield wire, (B) is the schematic which shows the wiring state of a shield wire. (A) is sectional drawing of the water stop part of the conventional shield electric wire, (B) is BB sectional drawing of (A).

Hereinafter, the embodiment of the shielded electric wire provided with the water stop part of the present invention is described.
As shown in FIG. 1, the basic structure of the shielded electric wire 1 is the same as that shown in FIG. In the shielded electric wire 1, 2 to 6 (6 in the present embodiment) core wires 2 and a ground drain wire 3 are covered with a shield layer 4 made of a metal foil tape or a metal mesh tube. Is covered with a sheath 5 made of an outer skin of an insulating resin layer. In this embodiment, the shield layer is a metal net tube.
The core wire 2 is a covered round electric wire in which a core wire obtained by twisting a large number of copper-based wires is covered with an insulating resin layer.

In the shielded electric wire 1, terminal fittings 7 and 8 are crimped and connected to both ends as in FIG. The shielded cable 1 is routed from the flooded area (X) of the engine room to the non-immersed area (Y) of the vehicle interior, and the terminal fitting 7 is connected to one end of the shielded cable 1 positioned in the flooded area, The terminal fitting 8 is connected to the other end of the shielded electric wire 1 positioned in the non-water-immersed region and the terminal fitting 8 is inserted and connected to the non-waterproof connector 9B.
At both ends of the shielded electric wire 1, the sheath 5 and the shield layer 4 are peeled over about 80 to 200 mm, and the exposed end of the core wire 2 is further peeled to crimp the terminal fittings 7 and 8. .

  In the shielded electric wire 1, water entering the inside of the shielded electric wire 1 from the cut end of the sheath 5 on the submerged area (X) side flows to the non-submerged area (Y) side and is transmitted to the terminal fitting 8, and the non-waterproof connector 9B. In order to prevent corrosion from occurring inside, a water stop portion 10 described later is provided on the connection side with the terminal fitting 8.

The shielded electric wire 1 which provided the water stop part 10 of 1st Embodiment in FIG. 2 and FIG. 3 is shown.
The water stop part 10 of 1st Embodiment is formed in the process shown in FIG. That is,
First, on the terminal side of the non-immersed area (Y) of the shielded electric wire 1, the sheath 5 and the shield layer 4 are cut by making an annular cut at a position 80 mm from the tip P2. After the cutting, as shown in FIG. 2 (A), the sheath and the shield layer cut from the cutting position P1 toward the tip P2 are moved and cut off, and the core wire 2 and the drain wire 3 are exposed.

  Next, as shown in FIG. 2 (B), a required dimension (in this embodiment, 20 mm away from the cutting position P1 to the sheath remaining side, an elongated elliptical shape having a long axis in the axial direction from the outer peripheral surface of the sheath 5. The intermediate cut 11 has an axial dimension of 8 mm to 12 mm, and the intermediate cut 11 is provided on the upper surface side in a state where the shielded electric wire 1 is horizontally disposed.

Next, as shown in FIG. 2 (C), a nozzle 18 for injecting water from above is disposed in the intermediate notch 11 opened upward, and a water-stopping agent made of silicone 15 melted from the nozzle 18. Is injected into the sheath 5. At that time, the silicone 15 injected from the intermediate notch 11 is accumulated in the sheath 5 and then penetrates into the gap inside the sheath 5. In this way, since the intermediate notch 11 of the sheath 5 is provided and the lower surface is a closed portion, a predetermined amount of silicone can be continuously injected into the inside of the sheath 5 and the silicone 15 injection operation is facilitated. it can.
Silicone 15 has a relatively low viscosity of 5 pa · s. Therefore, the silicone 15 injected from the intermediate cut 11 flows in the axial direction from the position of the intermediate cut 11, and the silicone 15 penetrates to a position close to the cutting position P1.

  When the molten silicone 15 is injected from the intermediate cut 11, it penetrates into the core wire 2 side through the mesh space of the shield layer 4 made of a metal mesh tube. Therefore, within the space surrounded by the sheath 5, the silicone 15 is present in the gaps between the inner peripheral surface of the sheath 5 and the shield layer 4, between the shield layer 4 and the core wire 2 and the drain wire 3, and between the core wires. Penetrate and fill.

  After injecting a predetermined amount of silicone 15, as shown in FIG. 2D, the outer peripheral surface of the sheath 5 having the intermediate cut 11 of the shielded wire 1 is attached to the adhesive tape 12 so as to close the upper opening of the intermediate cut 11. Cover with half wrap. In this embodiment, a vinyl chloride tape is used as the adhesive tape 12, and the thickness is 0.1 mm to 0.2 mm, and the thickness is 0.2 mm to 0.4 mm even when two sheets are overlapped by half wrap winding.

As described above, after the silicone 15 is injected, the silicone 15 is allowed to stand for a required time, and the injected silicone 15 is naturally cured.
As a result, the shielded electric wire 1 has a water stop 10 formed inside the intermediate cut 11 around which the adhesive tape 12 is wound at a position at least about 20 mm away from the cutting position P1 of the sheath. In addition, since the silicone 15 injected from the intermediate notch 11 flows and penetrates to some extent in the axial direction inside the sheath 5, the position close to the cutting position P1 also becomes the water stop portion 10 on the cutting position P1 side.

The shielded electric wire 1 provided with the water blocking portion 10 does not have a configuration in which a thick butyl pad is wound around the outer periphery of the sheath sandwiching the cutting position P1 of the sheath 5, and a thin adhesive tape 12 is cut in the middle of the sheath. 11 is merely wound around the outer periphery of the outer periphery of the water stop portion 10, so that the outer diameter of the water stop portion 10 can be reduced by about 30% compared to the case where a butyl pad is used.
Moreover, since the water stop part 10 is provided in the sheath 5 inside the sheath remaining side from the cutting position P1 of the sheath 5, the influence of thermal shock and vehicle vibration is suppressed, and between the sheath 5 and the core wire 2 It is possible to prevent generation of cracks and displacement of the filled and cured silicone. Therefore, the sealing property set in the durability test in the thermal shock can be ensured.

FIG. 4 shows a modification of the first embodiment.
In the modification, a wide width is used as the adhesive tape 12A, and the sushi roll is wound around the outer peripheral surface of the sheath 5 of the shield wire 1 so as to cover the intermediate cut 11.

FIG. 5 shows a second embodiment.
The second embodiment is different from the first embodiment in that the notch for injecting the molten water-stopping agent made of silicone 15 is the terminal notch 20 provided from the cutting position P1 of the sheath. Other configurations and operational effects are the same as those of the first embodiment.

  As shown in FIG. 5, a V-shaped end cut 20 is provided in the sheath 5 on the sheath remaining side from the cutting position P <b> 1 of the sheath 5. The length of the terminal notch 20 in the axial direction is 8 mm to 12 mm.

In the second embodiment, as shown in FIG. 5A, the sheath 5 is cut and removed by a length of 80 mm from the tip of the shielded electric wire 1 to form a V-shaped end cut 20 from the cutting position P1.
Next, as shown in FIG. 5 (B), the silicone 15 melted from the terminal cut 20 is injected from the nozzle 18, and then, as shown in FIG. 12 is half-wrapped.

As in the second embodiment, even when a terminal cut is made at the end of the sheath 5 from the cutting position P1 of the sheath, the gap in the sheath 5 can be filled with the silicone 15 without any gap, and a highly reliable water stop portion. 10 can be formed.
Other functions and effects are the same as those of the first embodiment, and thus description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 Shield electric wire 2 Core wire 4 Shield layer 5 Sheath 10 Water stop part 11 Intermediate cut 12 Adhesive tape 15 Silicone
20 Terminal cutting P1 Cutting position

Claims (5)

A shielded wire in which a core wire is covered with a shield layer, and the shield layer is covered with a sheath of an insulating resin layer,
The shield layer and sheath are peeled off at the terminal side of the shielded wire to expose the core wire, and there is an intermediate cut in the sheath at a position away from the skinned cutting position to the sheath remaining side by a required dimension. A thin adhesive tape is half-wrapped or widened to cover the outer peripheral surface of the sheath provided with the intermediate cut and filled with a water-stopping agent melted into the shielded electric wire from the intermediate cut. A shielded electric wire with a water stop, characterized in that the tape is wound around. A shielded wire in which a plurality of core wires are covered with a shield layer, and the shield layer is covered with a sheath of an insulating resin layer,
The shield layer and the sheath are peeled off at the terminal side of the shielded wire to expose the core wire, and the sheath on the sheath residual side has a terminal notch from the skinned cutting position. The shield wire is filled with a molten water-stopping agent, and a thin adhesive tape is half-wrapped or a wide adhesive tape is sushi-wrapped from the outer peripheral surface of the sheath provided with the terminal cut to the cutting position. A shielded electric wire provided with a water stop part.   The said water-stopping agent is silicone, the said core wire is 2-6, The dimension to the front-end | tip of the exposed core wire from the said skinning cutting position is 80 mm-200 mm, Any of Claim 1 thru | or 3 A shielded electric wire provided with the water stop part according to claim 1.   The terminal side provided in the vehicle and provided with the water stop portion is routed in the vehicle interior of the non-immersed area, and the terminal connected to the terminal on the opposite side is connected to a connector arranged in the flooded area, The shield electric wire provided with the water stop part of any one of the Claims 1 thru | or 3 which interrupted | blocked the water which permeates from the water immersion area side by the said water stop part. It is a formation method of the water stop part of a shield electric wire according to any one of claims 1 to 4,
At the end of the shielded wire, the shield layer and the sheath are peeled off to expose the core wire,
Then, the terminal cut or intermediate cut is made in the sheath,
Next, the shielded wire is horizontally arranged, and the viscosity is 3 to 7 Pa. With the cut end cut or intermediate cut upward. s low-viscosity silicone is injected into the terminal cut or intermediate cut,
Subsequently, the formation method of the water stop part of the shield electric wire which has wound the adhesive tape so that the above-mentioned terminal cut or intermediate cut may be covered.

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