JP2008198577A - Shield wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable connection of an earth terminal by drawing out a drain wire from both ends of a shield wire. <P>SOLUTION: The drain wire 12 extending over the whole length is inserted between a core wire 11 and a braided sleeve 13 having electromagnetic shield property, the drain wire 12 is bent by forming a zigzag folding 15 over the whole length or bent in a spiral form in advance, the length of the drain wire 12 at the time of extension is made to have an extra length by making it longer than the whole length L of the shield wire 10 having a surplus length, and it is made possible to draw out both ends of the drain wire 12 from the both ends of the shield wire 10 measured and cut at a prescribed length. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shielded wire, and in particular, improves electromagnetic shielding performance of a shielded wire into which a drain wire is inserted.

As a signal line routed in an automobile, a shield line is used at a place where shielding against noise is required. As the shield wire 1, a braided shield wire shown in FIG. 8 is usually used. The braided shield wire includes an insulation-coated electric wire (core wire) 2 covered with a braided tube 3 having a shielding function, and the braided sleeve 3 is covered with a jacket 4.
The processing procedure of the braided shield wire 1 is as follows. After adjusting and cutting, as shown in FIG. 9 (A), the outer sleeve 4 and the core wire 2 are exposed by cutting the outer jacket 4 by a required dimension from the tip. Next, as shown in FIG. 9 (B), the braided sleeve 3 is cut in the axial direction to draw out the core wire 2, and as shown in FIG. 9 (C), the terminal T1 is crimped and connected to the tip of the core wire 2. At the same time, the braided tube 3 is twisted, and a terminal T2 is connected to the tip of the braided tube 3 by crimping. (See JP-A-7-45311, etc.)

JP 7-45311 A

However, according to the above processing method, there is a problem that it takes time to manually draw the core wire 2 from the braided sleeve 3, and since the braided sleeve is used as a ground wire, there is a portion without a shield, and the shield performance There is a problem that decreases.
Also, depending on the type of noise, effective shielding may be achieved by grounding the shield layer from both ends in the length direction of the shield wire. In this case, the braided sleeve is connected to the ground wire. If there is a portion where there is no shield at both ends, there is a problem that the shield performance deteriorates at both ends.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a shielded wire having excellent electromagnetic shielding performance without easily degrading the shielding performance at both ends while being able to easily connect to ground at both ends of the shielding layer. .

In order to solve the above problems, as a first invention, there is provided one or a plurality of core wires whose core wires are covered with an insulating coating layer, and a braided sleeve having electromagnetic shielding properties which covers the core wires. In the shielded wire
A drain wire extending over the entire length is inserted between the core wire and the braided sleeve, and the drain wire is refracted into a spiral fold or bent in a spiral shape over the entire length, and the length when the drain wire is extended The shield wire is characterized in that it is longer than the entire length of the shield wire and has a surplus length so that the drain wire can be pulled out from both ends of the shield wire.

  In the case of the shielded wire, even if the drain wire is pulled out from one end side, the extra length portion is extended so that the drain wire is not pulled in at the other end side. Therefore, since the drain wire can be easily pulled out from the other end side in the same manner, it is possible to connect the ground to both ends of the drain wire, and the electromagnetic shielding performance can be effectively enhanced.

  It is preferable to set the surplus length provided by folding the drain wire so that the length of the drain wire at the maximum extension is 120% to 200% with respect to the total length of the shield wire. If it is less than 120%, the surplus length is too short, and the other end side may be pulled in when the drain wire is pulled out from one end side, and if it exceeds 200%, the surplus length part becomes bulky, This is because the diameter of the shield wire is increased.

Further, as a second invention, in a shielded wire having one or more core wires covering the core wire with an insulating coating layer, and a braided sleeve having electromagnetic shielding properties covering the core wire,
A linear first drain line and a second drain line are inserted between the core line and the braided sleeve, and the first drain line from one end of the shield line and the second drain from the other end. Provided is a shield wire characterized in that the wire can be drawn out.

  By inserting two non-continuous drain lines in this way, even if the first drain line is drawn from one end side, the second drain line is not affected, and the second drain line is connected to the other end. It can be easily pulled out from the side. Therefore, it is possible to ground the shield wire from two places on both ends, and the electromagnetic shielding performance can be effectively enhanced.

  The shield wire includes a jacket made of an insulating resin that covers the braided sleeve.

In addition, a terminal for ground connection is connected to each end of the drain wire drawn from both ends of the shield wire.
Alternatively, a ground terminal may be connected to the terminal of the drain wire drawn from one end, and a terminal to be inserted into the connector may be connected to the terminal of the drain wire drawn from the other end, and connected to another ground wire.

The core wire drawn out from the shield wire together with the drain wire protrudes in a state in which the outer cover is peeled off at the end in the length direction of the shield wire and the braided sleeve is exposed, and after the terminal connection to the end, the core wire It is preferable that the protrusion is covered with a braided sleeve.
Specifically, the drain wire and the core wire are exposed by pulling the braided sleeve exposed from the jacket, and the braided sleeve is returned to the original state after the end processing of the drain wire and the core wire. It can be covered with a braided sleeve up to near the root of the wire.
Thereby, the core wire exposed from the braided sleeve having electromagnetic shielding performance can be minimized, and the deterioration of the electromagnetic shielding performance can be suppressed.

As described above, according to the first invention, even if the drain line is pulled out from one end side of the shield wire, the extra length portion of the drain line only extends, so that the drain line can be pulled out from the other end side. it can.
Also in the second invention, since the two drain wires are inserted over the entire length of the shield wire, even if one drain wire is pulled out from one end of the shield wire and the other end is drawn into the shield wire. Since the tip of the other drain wire is located at the other end of the shield wire, the other drain wire can be drawn out from the other end of the shield wire.
Accordingly, since it becomes possible to draw a drain wire from both ends of the shield wire and take a ground, the electromagnetic shielding performance can be effectively enhanced.
In addition, by covering the exposed portion of the core wire protruding from the jacket with the braided sleeve, the exposed portion from the shield layer can be reduced, and a decrease in electromagnetic shielding performance can be suppressed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment.
As shown in FIG. 1, the shield wire 10 is formed by covering two core wires 11 and one drain wire 12 with a metal braided sleeve 13 having electromagnetic shielding properties, and insulating the outer periphery of the braided sleeve 13. It is covered with a jacket 14 made of resin.
The core wire 11 is an insulation-coated electric wire in which the core wire 11a is covered with an insulation coating layer 11b.
The drain wire 12 is a single core wire not covered with insulation, and is inserted between the core wire 11 and the braided sleeve 13 so as to extend over the entire length, as shown in FIG. Is in contact with.

  The drain wire 12 is processed in advance so as to be a crease 15 over the entire length. The total length of the drain wire 12 in a state where the hook fold 15 is extended to the maximum is set to be in a range of 120% to 200% with respect to the total length L of the shield wire 10.

Next, the terminal processing procedure of the shielded wire 10 will be described.
First, the jacket 14 at one end 10a of the shielded wire 10 cut to a predetermined length shown in FIG. 3A is peeled to a required length as shown in FIG.
Next, as shown in FIG. 3C, the braided sleeve 13 protruding from the outer jacket 14 is shrunk toward the outer jacket 14 while being contracted, and the core wire 11 and one end 12 a of the drain wire 12 from the tip of the braided sleeve 13 To protrude.
Next, the core wire 11 is pulled out to a required dimension, and as shown in FIG. 3D, a connector connection terminal 21 is crimped to the end of the core wire 11 and the ground terminal 22 is connected to one end 12a of the drain wire 12. Crimp the connection.

  As shown in FIG. 4 (A), the drain wire 12 drawn out from one end 10a of the shield wire 10 for connection to the ground terminal 22 is extended by a hook fold 15 extending in the drawing direction. Therefore, the other end 12b of the drain wire 12 is positioned at the other end 10b of the shield wire 10.

  Also at the other end 10b of the shield wire 10, as shown in FIG. 3E, the same processing as the one end 10a is performed to connect the connector connection terminal 21 to the end of the core wire 11, and the drain wire 12 The ground terminal 22 is connected to the other end 12b. At that time, as shown in FIG. 4B, the drain fold 15 can be extended at the other end side so that the other end 12 b of the drain wire 12 can be pulled out.

  As described above, the core wire 11 drawn from both ends of the shield wire 10 and connected to the terminal 21 is stretched and returned to the original braided sleeve 13 as shown in FIG. The braided sleeve 13 covers the exposed portion of the core wire 11.

  As described above, the shield wire 10 is formed with the crane fold 15 on the drain wire 12, so that the shield wire 10 can be pulled out from both ends by utilizing the extension of the crease fold 15, and the ground terminal to both ends of the drain wire 12. Can be connected, and the electromagnetic shielding performance can be effectively enhanced.

  Further, the end of the braided sleeve 13 that is a shield layer is not peeled off as in the conventional case, and the drain wire 12 and the core wire 11 are protruded by hand, and the braided sleeve 13 is returned to the original after connecting the terminal to the end. The exposed portion of the core wire 11 can be covered in a wider range.

FIG. 5 shows a modification of the first embodiment.
As a method of providing an extra length for the drain wire 12, the drain wire 12 is bent spirally over the entire length to form a so-called curled electric wire. Also in this case, since the drain wire 12 can be pulled out from both ends by utilizing the extension of the spiral portion, the drain wire 12 can be pulled out from both ends of the shield wire 10 and connected to the ground terminal.

6 and 7 show a second embodiment of the present invention.
In the second embodiment, two drain wires composed of two core wires 11 and a first drain wire 12-1 and a second drain wire 12-2 are inserted into the braided sleeve 13.

  Each of the first drain wire 12-1 and the second drain wire 12-2 is a straight single core wire, and is inserted between the core wire 11 and the braided sleeve 13 over the entire length of the shield wire 10, and both are braided. It is in contact with the sleeve 13.

As shown in FIG. 7, the first drain wire 12-1 is drawn from one end 10 a of the shield wire 10, and the ground terminal 22 is connected to the terminal. At this time, the first drain wire 12-1 is drawn and shortened on the other end side, but the terminal of the second drain wire 12-2 is shielded without being affected by the drawing of the first drain wire 12-1. The line 10 remains trimmed to the position of the other terminal 10a. Thereby, the second drain wire 12-2 can be easily pulled out from the other end 10b of the shield wire 10, and the ground terminal 22 can be connected to the other terminal.
In FIG. 7, the configuration in which the core wire 11 is pulled out from the shield wire 10 and the terminal is connected to the terminal is the same as that in the first embodiment, and the illustration is omitted.

  As described above, also in the present embodiment, the drain wires 12-1 and 12-2 can be drawn out from both ends of the shield wire 10 and the terminals 22 can be connected to the respective ends. It is possible to ground from two places.

It is a perspective view of the shield wire concerning a first embodiment of the present invention. It is sectional drawing of the shield wire of FIG. (A)-(F) is a figure which shows the terminal processing procedure of the shield wire shown in FIG. (A) (B) is drawing which shows a state when a drain wire is pulled out. It is sectional drawing which shows the modification of 1st embodiment. It is sectional drawing which shows the shield wire of 2nd embodiment. It is sectional drawing of the state which connected the terminal to the drain wire of the shield wire of 2nd embodiment. It is drawing which shows the conventional braided shield wire. It is drawing which shows the process sequence of (A)-(C) braided shield wire.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Shield wire 10a, 10b End part 11 Core line 12 Drain line 12a One end 12b Other end 13 Braided sleeve 14 Outer cover 15 Folding 16 Heat shrinkable tube 21 Terminal 22 Ground terminal

Claims (4)

In a shielded wire comprising one or more core wires covering the core wire with an insulating coating layer, and a braided sleeve having electromagnetic shielding properties covering the core wire,
A drain wire extending over the entire length is inserted between the core wire and the braided sleeve, and the drain wire is refracted into a spiral fold or bent in a spiral shape over the entire length, and the length when the drain wire is extended The shield wire is characterized in that the shield wire is longer than the entire length of the shield wire and has a surplus length so that the drain wire can be pulled out from both ends of the shield wire. In a shielded wire comprising one or more core wires covering the core wire with an insulating coating layer, and a braided sleeve having electromagnetic shielding properties covering the core wire,
A linear first drain line and a second drain line are inserted between the core line and the braided sleeve, and the first drain line from one end of the shield line and the second drain from the other end. A shielded wire characterized in that the wire can be pulled out.   The shield wire according to claim 1, further comprising an outer sheath made of an insulating resin that covers the braided sleeve.   The shield wire according to any one of claims 1 to 3, wherein a terminal for ground connection is connected to each end of the drain wire drawn from both ends of the shield wire.

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