JP2003197042A - Shielded wire harness structure and manufacturing method of shielded wire harness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shielded wire harness structure and a manufacturing method of an inexpensive shielded wire harness not becoming bulky even when it is bundled and capable of reducing noise interference in respective electric wires. <P>SOLUTION: A conductive sheet 25 comprised by forming a conductive face in one face of an insulation sheet is fit around along each outer circumference of a plurality of parallel electric wires 27 arranged side by side with intervals. Both end rims 25a and 25b of the conductive sheet 25 in parallel with the electric wires 27 are overlapped and joined. A drain wire 29 in continuity with the conductive face is held between the joined end rims 25a and 25b. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield wire harness structure for electromagnetically shielding each of thin electric wires and a method for manufacturing the shield wire harness.

[0002]

2. Description of the Related Art Conventionally, in order to avoid noise interference in a wire harness, for example, a coaxial shielded electric wire as shown in FIG. 8 has been used. In FIG. 8, 1 is a drain wire, and on the left side thereof, a plurality of insulating wire cores 7 in which the outer periphery of the conductor 3 is extrusion-coated with the insulator 5 are arranged. Reference numeral 9 denotes a shield tape, which is vertically formed so as to wrap the drain wire 1 and the left insulated wire core 7, and is integrated by a jacket 11 provided in the outermost layer. Jacket 11
Is coated with heat-resistant vinyl or the like by extrusion coating.

However, since the shielded electric wire thus constructed is obtained by surrounding the insulating wire core 7 with the shield tape 9 and molding it, and then extruding and covering the outermost layer with the jacket 11, a large manufacturing apparatus is required. There was a disadvantage that the cost became high. Also, this shielded wire is effective for wiring in a narrow path, but when bundled with another wire harness in a wide space, the knots of the jacket (the bulging portion covering the insulating wire core 7) may be rounded firmly. Because it will be difficult
On the contrary, there was a problem that it became thick and hindered space saving.

Therefore, conventionally, vinyl chloride 13 and polyethylene terephthalate (PET) 1 as shown in FIG. 9 are used.
5. Aluminum laminated sheet 19 consisting of aluminum foil 17
By using, to bundle and wind a plurality of electric wires, and connect a drain wire to the aluminum layer of the aluminum laminate sheet 19, a bundle of electric wires is shielded at one time, and measures are taken to reduce noise interference with other wire harnesses. Was there.

[0005]

However, the shielded wire harness structure in which the above-mentioned conventional aluminum laminate sheet is wound around the electric wire bundle is inexpensive and effective in saving space as compared with the shielded electric wire covered with the jacket. However, for a recent wire harness in which a video signal (for example, a video signal for each of R (red), G (green), and B (blue)) is present for each insulated wire core, a bundle of electric wires is If you wind it and shield it, you can
There was a possibility of causing crosstalk from the upper and lower wire harnesses. Further, the aluminum laminate sheet is made of vinyl chloride, polyethylene terephthalate, and aluminum foil. Particularly, since the thickness of vinyl chloride is 200 μm and the thickness of aluminum foil is 18 μm, it is not possible to individually coat thin electric wires. The present invention has been made in view of the above circumstances, is inexpensive, does not become thick even when bundled, and
An object of the present invention is to provide a shielded wire harness structure and a method for manufacturing a shielded wire harness, which can reduce noise interference in individual electric wires.

[0006]

A shield wire harness structure according to claim 1 according to the present invention for achieving the above object comprises a conductive sheet having a conductive surface formed on one surface of an insulating sheet, A plurality of parallel electric wires arranged at intervals are surrounded and attached along the outer periphery of each of the electric wires, and both ends of the electric wire of the conductive sheet in the parallel direction are overlapped and bonded, It is characterized in that a drain wire is sandwiched between the both edges so as to be electrically connected to the conductive surface.

In this shielded wire harness structure,
Apply the conductive sheet along each of the wires,
Since the drain wire is sandwiched between the joints of the both edges of the conductive sheet to establish continuity with the conductive surface, it is possible to independently shield thin electric wires with a simple structure. In addition, since a thin conductive sheet is used, it does not become thicker when used by being bundled with other wires, as compared with the conventional shielded wire covered with a jacket. This makes it possible to reduce the cost of the shielded wire harness, reduce noise interference, and save space.

The shielded wire harness structure according to claim 2 is the shielded wire harness structure according to claim 1, wherein the conductive sheet is formed by sequentially laminating vinyl chloride, polyethylene terephthalate, and aluminum foil. Characterize.

In this shielded wire harness structure,
The conductive sheet is formed by laminating an aluminum foil with a sheet of vinyl chloride as a support, with polyethylene terephthalate interposed. Thereby, the conductive sheet has a predetermined strength while being flexible and thin, and
The entire surface of the sheet becomes a conductive surface.

A shield wire harness structure according to a third aspect of the present invention is the shield wire harness structure according to the second aspect, wherein the vinyl chloride layer has a thickness range of 50 to 100 μm and the aluminum foil has a thickness range of 5 to 13 μm. To do.

In this shielded wire harness structure,
The thickness of the vinyl chloride layer and the aluminum foil is within a predetermined range (vinyl chloride layer: 50 to 100 μm, aluminum foil: 5 to 13 μm).
m) makes the conductive sheet useful in flexibility, for example, a conventional conductive sheet (vinyl chloride layer: 200).
μm, aluminum foil: 18 μm), which can be applied to thin electric wires, which was not possible.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a shielded wire harness, comprising a conductive sheet having a conductive surface formed on one surface of an insulating sheet on a base jig having a plurality of parallel grooves. A step of placing, a step of deforming the conductive sheet to the inside of the concave groove to make a recess, a step of inserting an electric wire into each concave portion of the conductive sheet deformed following the concave groove, A step of simultaneously laminating and joining both ends of the electric wire in the parallel direction of the electric property sheet, and at the same time sandwiching the drain wire by electrically connecting to the conductive surface between the both ends of joining.

In this method for manufacturing a shielded wire harness, a conductive sheet is placed on a base jig having a plurality of recessed grooves, the conductive sheet is dented, and an electric wire is put in the dented portion to form the conductive sheet. Since the drain wire is sandwiched between both end edges to be joined at the same time as overlapping and joining both end edges of the shield wire harness, which is attached so as to surround a thin conductive sheet with individual thin electric wires, a large-scale device It can be easily manufactured by using only a jig having a simple structure without using.

According to a fifth aspect of the present invention, there is provided a shielded wire harness manufacturing method, wherein a conductive sheet is formed by forming a conductive surface on one surface of an insulating sheet on a base jig having a plurality of parallel concave grooves. A step of placing, a step of placing a plurality of electric wires on the conductive sheet along the respective recessed grooves,
A step of pressing each of the electric wires together with the conductive sheet into the inside of the groove by pressing the electric wires against the base jig; and joining both ends of the conductive sheet in the parallel direction in the parallel direction. At the same time, the step of electrically connecting to the conductive surface and sandwiching the drain wire between the both end edges to be joined is performed.

In this method of manufacturing a shielded wire harness, electric wires are placed on the conductive sheet along the concave grooves, and the electric wires are pressed against the base jig to push the electric wires together with the conductive sheet into the concave grooves. Since it is inserted, the step of forming a recess in the conductive sheet can be performed at the same time as the step of inserting the electric wire (that is, the step of forming a recess in the conductive sheet can be omitted), and moreover, the convex portion that makes the conductive sheet fit in the groove Since it is not necessary to use a jig having a wire, the work of attaching the conductive sheet to the electric wire can be performed more easily and efficiently.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the shield wire harness structure and the method for manufacturing a shield wire harness according to the present invention will be described in detail below with reference to the drawings. 1 is a cross-sectional view of a shield wire harness structure according to the present invention, FIG. 2 is a cross-sectional view of the conductive sheet of FIG. 1, FIG. 3 is a graph showing the correlation between the thickness of the conductive surface and the shield effect, and FIG. 1 is an enlarged cross-sectional view of a main part of FIG. 1, and FIG. 5 is a plan view of a wire harness having the shielded wire harness structure of FIG.

In the shielded wire harness structure according to the present embodiment, as shown in FIG. 1, a plurality of conductive sheets 25 each having a conductive surface formed on one surface of an insulating sheet are arranged at intervals. The parallel electric wires 27 are surrounded and attached along the respective outer peripheries thereof. Further, both ends 25a, 25b of the electric wire 27 of the conductive sheet 25 in the parallel direction are overlapped and joined, and the joined ends 25a, 25b,
A drain wire 29 that is electrically connected to the conductive surface is sandwiched between 25b. As the drain wire 29, for example, a copper single wire, a twisted wire, a tin-plated copper single wire, a twisted wire, or the like can be used.

The conductive sheet 25, as shown in FIG.
Polyvinyl terephthalate 33 and aluminum foil 35 forming the conductive surface 23 on vinyl chloride 31 which is an insulating sheet.
And can be obtained by sequentially stacking. Thus, by laminating the aluminum foil 35 with the polyethylene terephthalate 33 interposed on the sheet having the vinyl chloride 31 as a support, the conductive sheet 25 has flexibility and is thin. It has a predetermined strength, and the entire surface of the sheet becomes the conductive surface 23.

In this case, it is particularly preferable that the conductive sheet 25 has a vinyl chloride 31 thickness of 50 to 100 μm and an aluminum foil 35 thickness of 5 to 13 μm.
By setting the thickness as described above, useful flexibility is generated in the conductive sheet 25, for example, for a video signal which cannot be achieved by a conventional conductive sheet (vinyl chloride layer: 200 μm, aluminum foil: 18 μm). It becomes possible to adhere to the thin electric wire 27.

By using such a thin conductive sheet 25, it is possible to obtain flexibility, while also having a shielding effect, as shown in FIG. You can get a shield effect.

The conductive sheet 25 is, for example, an aluminum foil 35.
However, it is attached to the electric wire 27 and the drain wire 29 so as to be the surface side after the attachment. Therefore, the adhered portions of the electric wire 27 and the drain wire 29 are as shown in FIG. That is, in the conductive sheet 25 having the lower surface of the aluminum foil 35, the electric wire 27 is surrounded by the recessed portion 37 formed by bringing the vinyl chloride 31 into contact with the electric wire surface, and then the left end edge 25a is bent. The upper surface of the left edge 25a is on the aluminum foil 35 side. The drain wire 29 is placed in contact with the aluminum foil 35. Then, the adhesive sheet 39 is interposed between the vinyl chloride 31 in the lowermost conductive sheet 25 and the surface of the bent left end edge 25a on the aluminum foil 35,
The adhesive sheet 39 joins the right end edge 25b of the conductive sheet 25 so as to be folded over the bent left end edge 25a. The drain wire 29 and the aluminum foil 35 may be connected not only by contact but also by ultrasonic connection.

As a result, as shown in FIG. 5, in the conductive sheet 25 attached to the plurality of electric wires 27, the aluminum foil 35 is exposed on the surface side and the individual electric wires 27 are shielded independently. There is. Further, the shielded wire harness structure can be adhered by the manufacturing method described below even after the electric wire 27 is connected to a connector for connecting electric wires (not shown). In the present embodiment, the aluminum foil 35
Although the conductive sheet 25 was applied so that the sheet was on the front side, the conductive sheet 25 can also be attached so that the aluminum foil 35 is placed on the inner side. In this case, it is necessary to use a covered electric wire for the electric wire 27, and the drain wire 29 is the right end edge 25b to be folded last.
Will be electrically connected to the aluminum foil 35 located on the lower surface of the.

In the shielded wire harness structure in which the aluminum foil 35 is applied inside, the aluminum foil 35
Is not exposed, the corrosion resistance of the aluminum foil 35 can be enhanced. Then, in the case of this configuration, the drain wire 29 can be arranged in the same manner as the electric wire 27 and independently wrapped.

In this embodiment, the case where the aluminum foil 35 is used for the conductive surface 23 will be described as an example.
Other than this, it may be formed using a copper foil. By using the copper foil, it is possible to enhance the corrosion resistance of the conductive surface 23 even when the conductive surface 23 is exposed particularly in the engine room.

Next, a method of manufacturing the shield wire harness having the above structure will be described. FIG. 6 is a process explanatory view showing the manufacturing procedure of the shielded wire harness of FIG. 1 in (a) to (e), and FIG. 7 is a process explanatory view showing a modified example of FIG. 6. In order to manufacture a shield wire harness, as shown in FIG. 6A, the conductive sheet 25 described above is placed on a base jig 43 having a plurality of parallel recessed grooves 41 formed therein.
Is placed so that the aluminum foil 35 is on the lower surface side.

Next, as shown in FIG. 6B, the concave groove 41 is formed.
Using the pressing jig 47 having the convex portion 45 corresponding to, the conductive sheet 25 is deformed to the inside of the concave groove 41 to be concave.
Next, as shown in FIG. 6C, the electric wire 2 is inserted into each of the recessed portions 37 of the conductive sheet 25 that has been deformed following the recessed groove 41.
Enter 7.

Next, as shown in FIG. 6 (d), the left edge 25a of the conductive sheet 25 is bent, and the drain wire 2 is placed on the aluminum foil 35 which is the upper surface of the bent left edge 25a.
Place 9. Next, the adhesive sheet 39 (broken line portion in FIG. 6) having substantially the same width as that of the base jig 43 is covered, and as shown in FIG. 6 (e), the adhesive sheet 39 is sandwiched between the right edge of the conductive sheet 25. 25b is the bent left edge 25
Fold it over a. This completes the manufacture of the shield wire harness 51.

In the above manufacturing procedure, the pressing jig 47 is used.
Although the case where the electric wire 27 is inserted after forming the recessed portion 37 in the conductive sheet 25 by using, the manufacturing method of the shielded wire harness 51 is shown in FIG.
As shown in (b) and (c), a plurality of electric wires 27 are placed on the conductive sheet 25 along the respective recessed grooves 41, and the electric wires 27 are pressed by using a pressing jig 47a.
Each electric wire 27 together with the conductive sheet 25 is provided with a groove 41.
You may push it inward.

According to this modification of the manufacturing method, the step of forming a recess in the conductive sheet 25 can be performed at the same time as the wire insertion step (that is, the step of forming a recess in the conductive sheet 25 can be omitted). Since it is not necessary to use the pressing jig 47 having the convex portion 45 for aligning the conductive sheet 25 with the concave groove 41, the work of attaching the conductive sheet to the electric wire 27 can be performed more easily and efficiently. You will be able to do it.

As described above, according to the above-mentioned shield wire harness structure, the thin electric wires 27 can be individually shielded with a simple structure, and in particular, the crosstalk from the left and right and the top and bottom in the video signal line can be prevented. Can be suppressed. Also, the characteristic impedance can be made stable. Further, since the thin conductive sheet 25 is used,
Compared with the case of a shielded electric wire with a conventional jacket, the joints between the electric wires are not so hard that the wire does not become thick when used in a bundle with other electric wires. This also has the effect of enabling the use of a corrugated tube having a smaller diameter than before.

Further, according to the above-described method for manufacturing the shield wire harness, the conductive sheet 25 is placed on the base jig 43 having the plurality of recessed grooves 41, and after the conductive sheet 25 is recessed, the recesses are formed. Insert the wire 27 into the part 37,
Since both ends 25a and 25b of the conductive sheet 25 are superposed and joined together, and the drain wire 29 is sandwiched between the joined ends 25a and 25b, the thin conductive sheet 25 is formed.
Can be easily manufactured by using only the jigs 43 and 47 having a simple structure, without using a large-scale device, and the shield wire harness 51 attached so as to individually surround the thin electric wires 27. .

In the above embodiment, the conductive surface 23
In the above description, the aluminum foil 35 or the copper foil is used as an example, but the conductive surface may be formed by applying conductive metal particles. Also, shield wire harness 5
In the manufacturing method of No. 1, the example in which the conductive sheet 25 is adhered using the adhesive sheet 39 has been described.
An adhesive layer may be formed in advance on the vinyl chloride surface 31a of No. 5, and with such a configuration, the workability in manufacturing the shield wire harness 51 can be further enhanced.

[0033]

As described in detail above, according to the shield wire harness structure of the present invention, the conductive sheet is attached along the outer circumference of each of the plurality of parallel electric wires, and Since both ends of the conductive sheet are overlapped and joined, and the drain wire is sandwiched between the joined ends to make it conductive with the conductive surface, thin wires can be individually shielded with a simple structure. In addition, since the thin conductive sheet is used, it does not become thick even when bundled with other electric wires. As a result, the cost of the shielded wire harness can be reduced, noise interference can be reduced, and space can be saved at the same time.

According to the method for manufacturing a shielded wire harness according to the present invention, a conductive sheet is placed on a base jig having a plurality of parallel recessed grooves, and the conductive sheet is placed inside the recessed grooves. Deform, put the wire in the recess,
Since the drain wire is sandwiched between the both edges to be joined at the same time when the both edges of the electrically conductive sheet are overlapped and joined, a shielded wire harness in which a thin electrically conductive sheet is attached so as to surround each thin electric wire is provided. It can be easily obtained by using a jig having a simple structure without using a large-scale device.

[Brief description of drawings]

FIG. 1 is a sectional view of a shield wire harness structure according to the present invention.

2 is a cross-sectional view of the conductive sheet of FIG.

FIG. 3 is a graph showing the correlation between the thickness of the conductive surface and the shield effect.

FIG. 4 is an enlarged cross-sectional view of a main part of FIG.

5 is a plan view of a wire harness having the shielded wire harness structure of FIG. 1. FIG.

6A to 6E are process explanatory views showing the manufacturing procedure of the shielded wire harness of FIG. 1 in (a) to (e).

FIG. 7 is a process explanatory view showing a modified example of FIG.

FIG. 8 is a cross-sectional view of a conventional shielded wire having a jacket covered by extrusion.

FIG. 9 is a cross-sectional view of a conventional aluminum laminate sheet.

[Explanation of symbols]

23 Conductive surface 25 Conductive sheet 25a, 25b both edges 27 electric wire 29 Drain wire 31 Vinyl chloride (insulation sheet) 33 Polyethylene terephthalate 35 Aluminum foil 37 Recess 41 groove 43 Base jig

Claims (5)

[Claims] 1. A conductive sheet formed by forming a conductive surface on one surface of an insulating sheet is surrounded and attached along each outer periphery of a plurality of parallel electric wires arranged at intervals. ,
A shield wire harness structure is also characterized in that the opposite ends of the electric wire of the conductive sheet in the parallel direction are overlapped and joined to each other, and a drain wire is sandwiched between the joined both ends so as to be electrically connected to the conductive surface. . 2. The shield wire harness structure according to claim 1, wherein the conductive sheet is formed by sequentially laminating vinyl chloride, polyethylene terephthalate, and aluminum foil. 3. The shielded wire harness structure according to claim 2, wherein the vinyl chloride layer has a thickness in the range of 50 to 100 μm and the aluminum foil has a thickness in the range of 5 to 13 μm. 4. A step of placing a conductive sheet having a conductive surface formed on one surface of an insulating sheet on a base jig having a plurality of parallel grooves formed therein, A step of deforming the groove to the inside of the groove, a step of inserting an electric wire into each concave portion of the conductive sheet deformed following the groove, and paralleling both end edges of the electric wire of the conductive sheet. A method of manufacturing a shielded wire harness, comprising the steps of superposing and joining, and at the same time, sandwiching a drain wire by electrically connecting to the conductive surface between the both end edges to be joined. 5. A step of placing a conductive sheet having a conductive surface on one surface of an insulating sheet on a base jig having a plurality of parallel concave grooves, and the conductive sheet, Placing a plurality of electric wires along each of the recessed grooves, and pressing each of the electric wires together with the conductive sheet into the inside of the recessed grooves by pressing the electric wires against the base jig, A shielded wire comprising: a step of overlapping and joining both ends of the electric wire of the conductive sheet in the parallel direction, and at the same time, electrically connecting the conductive surface to sandwich the drain wire between the both ends of the joining. Harness manufacturing method.