JPH06124608A - Wire harness with shield - Google Patents

Abstract

PURPOSE:To provide a wire harness with a shield, which can easily cope with automation with fewer processes, while its finished external dimension is small. CONSTITUTION:A covered electric wire 30 with a shield is formed of a metal foil polyester laminated tape 42 covered with a covered electric wire 40 in such a way that the metal foil (an aluminum foil 42a) is exposed outside. A plurality of covered electric wires 30 with shields thus formed are mutually bundled, and an aluminum foil 42a of an electric wire 30a for grounding is electrically connected to a predetermined grounding circuit via a terminal 32. Accordingly, an aluminum foil 42a of an electric wire 30b for a signal and/or a power supply is electrically connected to the grounding circuit via the electric wire 30a for grounding, thereby exhibiting shielding effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielded wire harness, and more particularly to a shielded wire harness used in electronic devices, copying machines, facsimiles, automobiles and the like.

[0002]

2. Description of the Related Art Conventionally, in order to suppress the influence of noise generated inside electronic equipment, automobiles, etc. and noise from the outside, a terminal is crimped to the end of the covered electric wire 2 as shown in FIG. 14, for example. A wire harness with a shield is used in which a plurality of wire harnesses are bound together and then the whole is covered with a braided tape 4 and an insulating tape 6. In this shielded wire harness, the braided tape 4
A terminal 8 is attached to the end portion 4a of the and is electrically connected to a ground circuit (not shown).

In addition to the shielded wire harness, as shown in FIGS. 15 and 16, for example, the covered electric wire 2
There is also one using a shielded covered electric wire 12 provided with a shield 10 such as a braid or a horizontal winding shield. In this shielded covered electric wire 12, as shown in FIG.
Is covered with an insulator 16 and further covered with a shield 10. The entire shield 10 is covered with an insulating sheath 18 to form a shielded covered electric wire 12. At the end of the shielded covered electric wire 12,
As shown in FIG. 16, the sheath 18 is peeled off, a contraction tube 20 is attached to protect the end of the sheath 18, and a terminal 8 is crimped to each end of the exposed covered electric wire 2 and the shield 10. . The plurality of shielded wire harnesses thus formed are bundled together, and the terminals 8 attached to them are inserted into the connector 22 (FIG. 15).

[0004]

By the way, when manufacturing the shielded wire harness of FIG. 14, after forming a plurality of wire harnesses, those wire harnesses are woven into a tubular shape, for example, tin-plated copper wires. Braided tape 4
It is necessary to wind the wire and further to wind the whole with the insulating tape 6, which inevitably increases the number of processing steps. Further, since the braided tape 4 is a braided tin-plated copper wire as described above, the terminal crimping to the end 4a thereof is performed by an automatic cutting crimping device (a device for crimping the terminal 8 to the covered electric wire 2). I can't do it. As described above, the use of the braided tape 4 is a major obstacle to automation of manufacturing the shielded wire harness. Furthermore, the use of the braided tape 4 causes a problem that the finished external dimensions of the shielded wire harness become relatively large.

On the other hand, in the shielded wire harness of FIG. 16, although the above-mentioned problems hardly occur, it is necessary to connect the grounding terminal to the shield 10 of each shielded covered electric wire 12, so that the number of manufacturing steps of the shielded wire harness is increased. Will increase.

The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a shielded wire harness which has a small number of steps, can be easily adapted to automation, and has a small finished external dimension. To aim.

[0007]

According to a first aspect of the present invention, a plurality of shielded covered electric wires formed by covering a metal foil polyester laminated tape with a covered electric wire are exposed so that the metal foil is exposed to the outside. In order to achieve the above object, at least one of the plurality of shielded covered electric wires functions as a grounding electric wire, while the other shielded covered electric wire is a signal wire harness. The metal foil of the grounding wire is electrically connected to a predetermined grounding circuit while functioning as a power supply or power supply wire.

According to a second aspect of the present invention, one end of the ground wire is connected to the ground circuit, and the other end is bundled with a part of the signal or power wire.

According to a third aspect of the present invention, a shielded covered electric wire formed by covering a metal foil polyester laminated tape on a covered electric wire so that the metal foil is exposed to the outside, and a conductive drain wire are bound together. In order to achieve the above object, the drain wire is electrically connected to a predetermined ground circuit.

According to a fourth aspect of the present invention, one end of the drain wire is connected to the ground circuit and the other end is bundled with a part of the shielded covered electric wire.

[0011]

According to the first aspect of the invention, the metal foil polyester laminated tape has a structure in which the metal foil is exposed to the outside.
A covered electric wire with a shield is formed by being covered with the covered electric wire. The plurality of shielded covered electric wires thus formed are bundled together, and the metal foil of the shielded covered electric wire that functions as a grounding electric wire is electrically connected to a predetermined ground circuit. Therefore, the metal foil of the shielded covered electric wire that functions as a signal or power supply electric wire is electrically connected to the earth circuit via the earth electric wire, and exhibits a shielding effect.

According to the second aspect of the present invention, one end of the ground wire is connected to the ground circuit, and the other end is bundled with a part of the signal or power wire. A region in which only the power supply wires are bundled is formed, and the finished external dimensions in that region are smaller.

According to the third aspect of the present invention, the shielded covered electric wire is formed by covering the covered electric wire with the metal foil polyester laminated tape so that the metal foil is exposed to the outside. The shielded covered electric wire thus formed is bundled with the drain wire, and the drain wire is electrically connected to a predetermined ground circuit. Therefore, the metal foil of the shielded covered electric wire is electrically connected to the ground circuit via the drain wire,
Exhibits a shield effect.

According to the invention of claim 4, one end of the drain wire is connected to the earth circuit, and the other end is bundled with a part of the shielded covered electric wire.
A region where only the shielded covered electric wires are bundled is formed,
The finished external dimensions in that area are smaller.

[0015]

【Example】

A. First Embodiment FIG. 1 is a sectional view showing a first embodiment of a shielded wire harness according to the present invention. FIG. 2 shows A-A of FIG.
It is a line sectional view. This shielded wire harness includes a plurality of shielded covered electric wires 30 configured as described below.
After forming the wire harness by crimping the terminal 32 to the end of the wire harness, a plurality of wires are bundled, and the central part thereof is, for example, the insulating tape
Insulated and fixed in 4. Here, for convenience of description of the embodiment, before describing the configuration of the shielded wire harness according to the first embodiment, the configuration of the shielded covered electric wire 30 that forms the shielded wire harness will be described first.

The shielded covered electric wire 30 has a core wire 36.
A covered electric wire 40 obtained by covering the insulator 38 with a metal foil polyester laminate tape 42 is covered. That is, metal foil polyester laminated tape 4
Reference numeral 2 denotes a metal foil, for example, an aluminum foil 42a laminated with a polyester tape 42b. The aluminum foil 42a is vertically attached to the covered electric wire 40 so as to be exposed to the outside. Thus, as shown in FIGS. 1 and 2, the shielded covered electric wire 30 whose surface is shielded by the aluminum foil 42a is produced.

Next, the shielded wire harness according to the first embodiment will be described. As shown in FIG. 2, this shielded wire harness includes, for example, four shielded covered electric wires 30. One of these four shielded covered electric wires 30 functions as a grounding electric wire, while the other shielded covered electric wires functions as a signal electric wire (or a power supply electric wire) for transmitting an electric signal. Therefore, in the following description, in order to clearly distinguish the two, the former is referred to as the “grounding electric wire 30a” and the latter is referred to as the “signal or power supply electric wire 30b”.

The grounding electric wire 30a is obtained by cutting the shielded covered electric wire 30 at a predetermined position (cutting position) by the electric wire cutting and peeling device shown in FIG. 3, and further, by a constant distance L1 from the cutting position, the insulator 38 shown in FIG. And the metal foil polyester laminated tape 42 are peeled off. That is, in the electric wire cutting and stripping device, a pair of cutting cutters 44 for cutting the shielded covered electric wire 30 on the electric wire arranging line X and front and rear sides of the cutting cutter 44 are arranged respectively. Insulator 3 shown
8 and a pair of cutting cutters 46 and 48 for cutting the metal foil polyester laminate tape 42. Further, a drive mechanism (not shown) is connected to the cutters 44, 46, 48, and the cutters 44, 46, 48 are opened and closed in synchronization with each other by operating the drive mechanism.

Then, at a predetermined timing, as shown in FIG. 3, a cutting cutter 44 and cutting cutters 46, 48 are provided.
Are closed synchronously, the shielded covered electric wire 30 is cut by the cutting cutter 44 at the cutting position, and the metal foil polyester laminate tape 42 on the outer periphery of the shielded covered electric wire 30 on both sides of the cutting position and the insulation shown in FIG. Body 38
Are cut by the cutting cutters 46 and 48, respectively. Further, in this cut state, the shielded covered electric wire 30 is moved in the directions P and Q, respectively, as shown in FIG. 4, and as a result, the length L1 from the cut portion in the P direction and the Q direction.
Only the insulator 38 and the metal foil polyester laminated tape 42 shown in FIG. 1 are peeled off to expose the core wire 36 and form the core wire portion 50.

Further, the terminal crimping process is performed on the grounding electric wire 30a, which has been cut and stripped as described above, by a conventionally known terminal crimping device. That is, the core wire connecting portion 3 of the terminal 32 is connected to the core wire portion 50 of the ground wire 30a.
2a is crimped, and the covering grip portion 32 of the terminal 32 is formed.
b is pressure-bonded so as to grip the end portion of the metal foil polyester laminated tape 42 (FIG. 1). Thus, the terminal 32 is fixed to the grounding electric wire 30a, and the aluminum foil 42a of the grounding electric wire 30a is electrically connected to the terminal 32.

On the other hand, the signal or power wire 30b is
For example, it is formed by the electric wire cutting and peeling device shown in FIG. In this wire cutting and stripping device, in addition to the cutting cutter 44 and the cutting cutters 46, 48 provided in the device of FIG. A pair of cutting cutters 52, 5 for cutting only the tape 42
4 are provided.

Then, as shown in FIG. 5, when the cutting cutter 44 and the cutting cutters 46, 48, 52, 54 are closed synchronously, the shielded covered electric wire 30 is cut by the cutting cutter 44 at the cutting position. At the same time, the metal foil polyester laminate tape 42 and the insulator 38 on the outer periphery of the shielded covered electric wire 30 are cut by the cut cutters 46 and 48 on both sides of the cutting position, and only the metal foil polyester laminate tape 42 is cut cutter 5.
It is cut by 2, 54 respectively. Further, in this cut state, the shielded covered electric wire 30 is moved in the directions P and Q, respectively, as shown in FIG. 6, and as a result, in the P direction and the Q direction, the insulator 38 is cut by the length L1 from the cut portion. Also, the metal foil polyester laminated tape 42 is peeled off to expose the core wire 36 to form the core wire portion 50, and the metal foil polyester laminated tape 42 is further peeled off from the core wire portion 50 by a predetermined length L2 to form an insulator. Three
8 is exposed and a coated gripping area 56 is formed.

Further, the terminal crimping process is performed on the signal or power source electric wire 30b, which has been cut and stripped as described above, by a conventionally known terminal crimping device. That is, the core wire connecting portion 32a of the terminal 32 is crimped to the core wire portion 50 of the signal or power supply wire 30b, and the coating gripping portion 32b of the terminal 32 is crimped so as to grip the coating gripping area 56 (FIG. 1). In this way, the terminal processing for the signal or power wire 30b is performed.

In this embodiment, the ground wire 30 is used.
Although the cutting and peeling processing for the a and the signal or power supply wire 30b are performed by different devices, respectively, they may be performed by the same device (FIG. 5). That is, by using the device of FIG.
In order to perform the peeling process, the cutting cutters 52 and 54 provided in the device of FIG.
46 and 48 may be operated as described above.

The ground wire 30a and the signal or power wire 30b, which have been thus terminated, are arranged in parallel with each other, and the terminal 32 attached to the ground wire 30a is connected to a ground circuit (not shown). The terminals 32 attached to the signal or power supply wires 30b are respectively inserted into predetermined positions of the connector 22 so as to be connected and capable of transmitting a desired electric signal (FIG. 7). Then, as shown in FIG. 8, an insulating tape 34 is wound around the center of the grounding electric wire 30a and the signal or power electric wire 30b to form a shielded wire harness.

As described above, in this embodiment, a plurality of shielded covered electric wires 30 constituting the shielded wire harness are bundled, and one of the shielded covered electric wires 30 is bundled.
Since the book is used as the grounding electric wire 30a and is electrically connected to a predetermined grounding circuit, each electric wire for signal or power supply 30b is used.
The aluminum foil 42a of is the aluminum foil 42 of the ground wire 30a.
It is directly or indirectly contacted with a and electrically connected to the earth circuit through the earth wire 30a, so that a desired earth effect can be obtained. As described above, according to the shielded wire harness of the present embodiment, the tape winding step (the step of winding the shield tape) is not required, and the number of signal or power supply wires 30b is eliminated. , The terminal treatment for grounding is the grounding wire 30a
It is only necessary to perform the above, and the shielded wire harness can be manufactured in a small number of steps.

Further, since the terminal treatment of the grounding electric wire 30a can be performed by a conventionally known device, the manufacturing of the shielded wire harness can be easily automated.

Furthermore, without using a braided tube,
Since the shielded wire harness is formed, the finished external dimensions are smaller than that of the shielded wire harness using the braided tube (FIG. 14), and the shielded wire harness can be made compact.

B. Second Embodiment FIG. 9 is a sectional view showing a second embodiment of the shielded wire harness according to the present invention. This second embodiment is largely different from the first embodiment described above. As the grounding electric wire 30a, the shielded covered electric wire 30 is used in the first embodiment, whereas the second embodiment is made of a conductive material. A drain line 58 is used, and other configurations are almost the same.

That is, as described above, the shielded covered electric wire 30 is subjected to a predetermined end treatment to form the signal or power supply electric wire 30b, while the drain wire 5 is formed.
An insulating contracting tape 60 is inserted into the end portion of 8, and a grounding terminal 32 is crimped to connect the grounding electric wire 30.
a is formed. Then, the grounding electric wire 30a and the signal or power supply electric wire 3 which are terminal-treated in this manner
0b are arranged in parallel, and the ground wire 3
So that the grounding terminal 32 attached to the terminal 0a can be connected to a grounding circuit (not shown), and the terminal 32 attached to the signal or power supply wire 30b can transmit a desired electric signal. After being inserted into the connector 22 at predetermined positions, the insulating tape 34 is wound around the central portions of the ground wire 30a and the signal or power wire 30b to form a shielded wire harness.

As described above, in this embodiment, the signal or power wire 30b is the ground wire (drain wire) 3
0a and are electrically connected to each other, and the ground wire 30a is electrically connected to a predetermined ground circuit to obtain a desired ground effect. In this way, the shielded wire harness according to this embodiment can also achieve the same effects as those of the first embodiment.

C. Third Embodiment FIG. 10 is a view showing a third embodiment of the shielded wire harness according to the present invention. In this embodiment, a short ground wire 62 is used as the ground wire 30a. The short ground electric wire 62 may be one obtained by crimping the terminal 32 to one end of the shielded covered electric wire 30 as in the first embodiment, or the drain wire 58 as in the second embodiment.
You may use what crimped the terminal 32 to the one end.

Specifically, as shown in FIG. 11, short earth wires 62 are arranged in parallel at both ends of the signal or power wire 30b formed as described above.
Further, the grounding terminal 32 attached to the short earth wire 62 is connected to an earth circuit (not shown), and the terminal 32 attached to the signal or power wire 30b transmits a desired electric signal. So that each of them can be inserted into the connector 22 at a predetermined position, the insulating tape 34 is wound around the other end of the short ground wire 62 and the central part of the signal or power wire 30b to form a shielded wire harness. Has been formed.

In the shielded wire harness thus formed, as shown in FIG.
Is a bundle of only the signal or power wire 30b, and the ground wire 30a and the signal or power wire 30
The finished external dimensions are smaller than those of the above embodiment (FIG. 8) in which b is bundled. Therefore, the shielded wire harness can be finished more compactly.

Further, in this shielded wire harness, a short ground electric wire 62 having a fixed length from the terminal 32, for example, about 80 mm can be used regardless of the entire length. Therefore, the short ground wire 62 can be standardized regardless of the entire length of the shielded wire harness.

D. Other Embodiments In the third embodiment described above, the short ground electric wires 62 that function as the ground electric wires 30a are provided at both ends of the shielded wire harness. However, as shown in FIG. 12, they may be connected to one end. You may

In the above embodiment, the ground wire 30 is used.
Although the terminal 32 attached to a is inserted into a predetermined position of the connector 22, as shown in FIG.
2 may be exposed to the outside and directly connected to a suitable earth circuit. The shape / type of the terminal 32 is not particularly limited.

Furthermore, in the above embodiment, the shielded wire harness composed of the three signal or power supply wires 30b and one grounding wire 30a has been described, but the grounding wire 30a and the signal or power supply are also described. Electric wire 3
The number of 0b is not particularly limited.

[0039]

According to the first aspect of the present invention, the core wire is covered with an insulator, and the metal foil polyester laminate tape is covered with the insulator so that the metal foil is exposed to the outside. A shielded wire harness is configured by bundling a plurality of covered electric wires, and a metal foil of one of the plurality of shielded covered electric wires that functions as an earth electric wire is electrically connected to a predetermined earth circuit. Since it has a small number of steps, it is possible to easily cope with automation and reduce the finished external dimensions.

According to the second aspect of the present invention, one end of the ground wire is connected to the ground circuit and the other end is bundled with a part of the signal or power wire.
The finished external dimensions of the shielded wire harness can be made smaller.

According to the third aspect of the present invention, the shielded covered electric wire is obtained by covering the core wire with an insulator, and further covering the insulator with a metal foil polyester laminate tape so that the metal foil is exposed to the outside. And a conductive drain wire are bundled together to form a shielded wire harness, and the drain wire is electrically connected to a predetermined ground circuit. Therefore, the same effect as the invention of claim 1 is obtained. Is obtained.

According to the fourth aspect of the present invention, one end of the drain wire is connected to the ground circuit and the other end is bundled with a part of the signal or power supply wire. Therefore, the shielded wire harness is provided. The finished external dimensions of can be made smaller.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a shielded wire harness according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a diagram showing a cutting / peeling process for an electric wire for grounding.

FIG. 4 is a diagram showing a cutting / peeling process for an electric wire for grounding.

FIG. 5 is a diagram showing a cutting / peeling process for a signal or power wire.

FIG. 6 is a diagram showing a cutting / peeling process for a signal or power wire.

FIG. 7 is a diagram showing a manufacturing procedure of the shielded wire harness of FIG. 1.

FIG. 8 is a diagram showing a manufacturing procedure of the shielded wire harness of FIG. 1.

FIG. 9 is a sectional view showing a second embodiment of the shielded wire harness according to the present invention.

FIG. 10 is a view showing a third embodiment of the shielded wire harness according to the present invention.

11 is a diagram showing a manufacturing procedure of the shielded wire harness of FIG.

FIG. 12 is a diagram showing another embodiment of the shielded wire harness according to the present invention.

FIG. 13 is a view showing still another embodiment of the shielded wire harness according to the present invention.

FIG. 14 is a diagram showing a first conventional example of a shielded wire harness.

FIG. 15 is a view showing a second conventional example of a shielded wire harness.

16 is a partial cross-sectional view of FIG.

17 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 30 shielded covered electric wire 30a ground electric wire 30b signal or power supply electric wire 40 covered electric wire 42 metal foil polyester laminate tape 42a aluminum foil (metal foil) 62 short length ground electric wire

Claims (4)

[Claims] 1. A shielded wire harness formed by bundling a plurality of shielded covered electric wires, each of which is formed by coating a metal foil polyester laminated tape on a covered electric wire such that the metal foil is exposed to the outside. At least one of the plurality of shielded covered electric wires functions as a grounding electric wire, while the other shielded covered electric wire functions as a signal or power supply electric wire, and a metal foil of the grounding electric wire is predetermined. A wire harness with a shield, which is electrically connected to the ground circuit of. 2. The shielded wire according to claim 1, wherein one end of the ground wire is connected to the ground circuit and the other end is bundled with a part of the signal or power wire. Harness. 3. A shield formed by bundling a shielded covered electric wire, which is obtained by covering a covered electric wire with a metal foil polyester laminated tape so that the metal foil is exposed to the outside, and a conductive drain wire. A wire harness with a shield, wherein the drain wire is electrically connected to a predetermined ground circuit. 4. The shielded wire harness according to claim 3, wherein one end of the drain wire is connected to the ground circuit and the other end is bundled with a part of the shielded covered electric wire.