JP4070623B2 - Shielded cable - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wire harness routed in an automobile or the like, and more particularly, to a ground connection structure for drain wires of shielded cables when a plurality of shielded cables are routed in an engine room or the like of an automobile. It is.
[0002]
[Prior art]
In general, a wire harness is an electrical wiring system in which a predetermined circuit is configured by a plurality of cables and electronic components and connectors connected to the plurality of cables. Among these, a shielded cable is used as an in-vehicle electrical component that is particularly required to shield noise, as a cable that connects this to an electronic component. This shielded cable includes a sheath that is a cable jacket, which includes a plurality of signal lines and one drain line via a shield layer such as a shield tape, and is normally conducted to the shield layer. The drain line must be connected to earth.
[0003]
An example of the configuration of a wire harness using a plurality of such shielded cables is shown in FIG. In this case, various sensors 21 in an automobile engine room and an indoor control circuit 22 are connected by a plurality of shielded cables 23.
[0004]
As shown in the figure, the end of each shielded cable 23 is stripped to expose the internal signal line Wa and drain line Wd. In this case, for the ground connection of the drain line Wd of each shield cable 23, the lead wire 25 is connected to the end of each drain line Wd on the indoor side by the crimp terminal 24, and the terminal 26 attached to the end of the lead wire 25 is connected. Is inserted into the joint connector 27, and the three drain lines Wd are centrally connected by the joint terminal 28 in the joint connector 27. By attaching the ground terminal 30 connected to one end of the ground wire 29 connected to the joint terminal 28 to the vehicle body panel or the like, the drain wire Wd of the shield cable 23 is grounded.
[0005]
In this case, since the peeled length of the sheath and shield layer at the end of the shield cable 23 is usually about 80 mm, the length of the exposed signal line Wa and drain line Wd is also 80 mm. In addition, the length of the lead wire 25 may be 200 to 1000 mm because of the relationship with the installation location of the joint connector 27.
[0006]
[Patent Document 1]
JP 2000-268893 A [Problems to be solved by the invention]
[0007]
However, when a joint connector is used for grounding a plurality of drain wires as described above, it may be difficult to secure a space for installing the joint connector. Moreover, since parts such as lead wires, joint connectors, and terminals are required and there are terminal crimping and connector connection, there is a problem that the number of work steps for wiring is large. Further, since the peeled portion becomes an unshielded portion, there is a problem that if the peeled length is long, sufficient shielding effect, which is the intended purpose of the shielded cable, cannot be achieved at the terminal portion. The problem to be solved by the present invention is to provide a shielded cable that can eliminate the need for such a joint connector for a plurality of drain line concentrated connections.
[0008]
[Means for Solving the Problems]
Shielded cable according to the present invention for solving this problem, a plurality of shielded cables comprising a signal line and the shield layer for shielding of the signal line and the conductive drains lines and their shielding layer is coated with a sheath A drain wire exists over the entire length of each shielded cable, the drain wire exposed from the end of each shielded cable is connected to the drain wire of another shielded cable, and the drain wire of each shielded cable is connected to one another. The gist is that it is configured as a continuous line.
[0009]
According to the shielded cable having the above configuration, the drain wire exists over the entire length of each shielded cable of the plurality of shielded cables, and the drain wire exposed from the end of each shielded cable is the drain of the other shielded cable. Since the drain line of each shielded cable is connected as a continuous line, for example, the drain line exposed from the right end of the first shield cable is exposed from the right end of the second shield cable as well. The drain line that is connected to the drain line and exposed from the left end of the second shield cable is further connected to the drain line that is exposed from the same left end of the third shield cable. Is a continuous line state.
[0010]
Thus, since the drain line of each shielded cable is configured as one drain line connected as one continuous line as a whole, an earth terminal is attached to one of the exposed portions of the drain line. If connected, the ground connection can be easily performed collectively. That is, a joint connector for concentrated connection as in the prior art is not required, and accordingly, the number of parts is reduced and workability is improved.
[0011]
In this case, the drain line cuts only the signal line and shield layer of the shield cable together with the sheath when cutting one long shield cable into a plurality of shield cables of a predetermined size, and the drain line is cut. If it is configured as a continuous line that is exposed from the sheath without being connected, the drain lines of each shielded cable will be connected in a state where there is no connection portion, so it is necessary to connect the drain lines separately. There is no processing or work, it is simple, and since it is a continuous line with no connection part, connection reliability is high.
[0012]
Further, a slit having a predetermined length along the length direction is cut in the cut portion of the sheath, and after the drain wire is taken out of the slit, only the signal line and the shield layer are put together with the sheath in the middle portion of the slit. If the configuration is made such that the drain wire is left as a continuous continuous line without being cut, it is easy to leave the drain wire without being cut, and the slit is used to remove the stripped portion of the shield cable. The length can be shortened, and the exposed length of the signal line can be shortened, so that the shielding property is improved.
[0013]
Further, if the shielded cable is a one-core type cable having one signal line, a one-core type shielded cable having a shield layer on the outer periphery of the signal line and a drain line positioned on the outer side thereof, The drain line can be exposed only by peeling off the sheath, and it becomes easy to cut only the signal line together with the sheath without cutting the drain line. Further, since the signal line still has the shield layer even if the sheath is peeled off, the shielding performance is maintained even when the signal line is exposed, and the shielding performance is not deteriorated due to the stripping.
[0014]
Similarly, the shield cable is intended multi-core comprising a plurality of signal lines, a configuration in which the drain line is located outside each of the plurality of signal lines has a shield layer on the outer periphery, a plurality of If any multi-core shielded cable with a shield layer on the outer periphery of the signal lines and a drain line on the outside is used, the drain line can be exposed simply by peeling off the sheath. It becomes easy to cut only the signal line together with the sheath without cutting the drain line. Further, since the signal line still has the shield layer even if the sheath is peeled off, the shielding performance is maintained even when the signal line is exposed, and the shielding performance is not deteriorated due to the stripping.
[0015]
In this case, the drain line is not twisted with the signal line, and if a shielded cable configured at a predetermined position in the sheath is used, the position of the drain line can be easily understood, and the sheath is peeled off. or exposing the line, working or to eject the only drain line outside is facilitated leading the sheath by a slit. Furthermore, if the marking is provided on the outer surface of the sheath of the shielded cable to indicate the position of the drain wire in the shielded cable, the workability is further improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a shielded cable according to the present invention will be described in detail with reference to the drawings. The wire harness 10 shown in FIG. 1 is composed of a bundle of a plurality of shield cables (three in this embodiment), and is a position for cutting one long shield cable 1A shown in FIG. Two slits 2 and 3 having a predetermined length along the length direction are cut in, and the drain lines Wd-1 and Wd-2 are taken out from the slits 2 and 3, respectively. The signal line Wa is cut together with the sheath Wb in the middle, and the drain lines Wd-1 and Wd-2 are processed so as to remain as a continuous line without being cut.
[0017]
Cie over shielded cables 1A used in the wire harness 10 in which having a sectional structure as shown in FIG. 3, the shield tape We are electrically connected to the signal line Wa wound on the outer circumference and shielding tape We in its outer position The drain line Wd is included in the sheath Wb.
[0018]
A cable processing procedure will be described with reference to FIGS. First, slits 2 and 3 having a predetermined length are cut and formed in the cable length direction from the outside of the sheath Wb at the two cutting positions of the long shielded cable 1A with a blade jig or the like. Only the drain lines Wd-1 and Wd-2 are taken out (see FIG. 2A), and the signal line Wa and the shield tape We are cut together with the sheath Wb in the middle of the slits 2 and 3 (FIG. 2B). reference).
[0019]
When the shield cables 1A-1, 1A-2, 1A-3 cut into three are arranged as shown in FIG. 2C, the three shield cables 1A-1, 1A-2, 1A-3 are arranged. Each of the drain lines Wd becomes a continuous line connected by the exposed drain lines Wd-1 and Wd-2. That is, as shown in the drawing, the drain line Wd-1a exposed from the right end slit 2a of the first shield cable 1A-1 is exposed from the right end slit 2b of the second shield cable 1A-2. The drain line Wa-2a is connected to the drain line Wd-1b without any break, and is exposed from the left end slit 3a of the second shield cable 1A-2. The drain line Wa-2a is also from the left end slit 3b of the third shield cable 1A-3. The drain lines Wd of the shielded cables 1A-1, 1A-2, 1A-3 are connected to each other without any breaks, such as being connected to the exposed drain lines Wd-2b without breaks.
[0020]
As described above, since the drain lines of the shielded cables are connected as one continuous line as a whole, the grounding is completed when any of the exposed drain lines is grounded. In the case of FIG. 1, the drain line Wd-3 exposed from the left end of the first shield cable 1A-1 is directly connected to the ground terminal 4.
[0021]
Then, in order to expose the signal line Wa, the sheath Wb at the end of each shielded cable is removed and the connector terminal 5 is connected (see FIG. 1). In the case of the shielded cable 1A used in this embodiment, even if the sheath Wb is removed, the signal line Wa is in a state where the shield tape We is wound, so that the shield property of the wound portion is maintained even if it is exposed. The reduction in shielding performance due to the exposure of the signal line is reduced.
[0022]
When the three shielded cables are bundled, for example, the remaining part of the drain line Wd-2 exposed from the slits 3a and 3b may be fixed to the cable with the tape 6 as shown in FIG.
[0023]
In the above-described embodiment, the drain line is left without being cut, so that the continuous line is connected. However, as shown in FIG. 5, the long shielded cable 1A is connected to the drain line Wd as usual. The drain lines Wd-1a, Wd-1b, Wd-2a, and Wd-2b are exposed by removing the sheath Wb at the ends of the cables 1A-1, 1A-2, and 1A-3, respectively. Therefore, a configuration in which the drain lines exposed so that the drain lines Wd become a continuous continuous line as a whole may be connected by the crimp terminal 7 may be used. In the embodiment of FIG. 5, the crimp terminal 7 is required, but a junction connector as in the prior art is not required.
[0024]
One or a plurality of signal lines Wa and drain lines via a shield tape We in a sheath Wb, such as a single-core shielded cable 1B or a multi-core shielded cable 1C having a cross-sectional structure shown in FIG. Of course, it is possible to apply the drain line connection structure as in the embodiment shown in FIGS. 1 and 5 to a shielded cable including Wd. In addition, it is easier to expose the drain line from the cable by using a signal line including a signal line having a shield layer on the outer periphery and a drain line located outside the signal line.
[0025]
In particular, a shielded cable 1D as shown in FIG. 7 is preferably used. This is a single-core type having one signal line Wa, and a shield tape We is wound around the signal line Wa and the drain line Wd is not twisted with the signal line Wa on the outside, so that a predetermined position in the sheath Wb is obtained. It is composed of.
[0026]
Further, shielded cables 1E and 1F as shown in FIG. 8 are suitable as a similar multi-core shielded cable. This is a multi-core type flat cable having a plurality of signal lines Wa. In FIG. 8A, the shield tape We is wound around each of the plurality of signal lines Wa, and the drain line Wd is located outside thereof. The structure shown in FIG. 8B has a structure in which a plurality of signal lines Wa are bundled together and a shield tape We is wound around and a drain line Wd is positioned outside the shield tape We.
[0027]
If a single-core or multi-core shielded cable having a structure in which the drain line is located outside the shield layer is used, the drain line is exposed only by peeling off the sheath, or a slit is cut to form the drain line. or to Eject is easily performed in the prone position of the drain line is recognized. In this case, as shown in FIGS. 7 and 8, it is more preferable that the marking 8 indicating the position of the drain line Wd is provided on the outer surface of the sheath Wb.
[0028]
Further, since the shielded cable having such a structure is in a state where the shield tape We is still wound around the signal line Wa even if the sheath Wb is peeled off, the signal line Wa is shielded even in the exposed state. Therefore, there is little decrease in shielding performance due to the stripping, and the shielding performance of the cable terminal is improved as compared with the prior art.
[0029]
As described in detail above, in the connection between the drain lines exposed from the ends of the shielded cables of the plurality of shielded cables, the drain line exposed from one end of the first shielded cable is the same as that of the second shielded cable. Similarly, the drain line that is connected to one end and exposed from the other end of the second shield cable is connected to the drain line that is exposed from one end of the third shield cable. By connecting the drain lines of the shielded cables sequentially to form a continuous line, if the ground terminal is connected to one of the exposed portions, the ground connection can be easily performed collectively. That is, since joint connectors and lead wires for concentrated connection as in the prior art are not required, the number of parts is reduced accordingly, and workability is improved.
[0030]
In addition, a slit of a predetermined length along the length direction is formed in the sheath of the cut portion of the long shield cable, the drain line is taken out of the slit, and then the signal line and the shield layer in the middle portion of the slit By cutting only the cable together with the sheath and leaving the drain line as an unbroken continuous line, the drain lines of each shielded cable can be connected to each other simply by cutting. There is no processing or work to do, and since it is a continuous continuous line, connection reliability is high. Furthermore, the process of leaving the drain line without cutting is facilitated, and the length of the stripped portion of the shield cable can be shortened by the slit, so that the shielding property is improved.
[0031]
Furthermore, if the shield cable has a shield layer with a shield layer on the outer periphery of the signal line and the drain line is positioned outside the signal line, the drain line can be exposed by simply peeling off the sheath. It becomes easy to cut only the signal line together with the sheath without cutting. Further, even if the sheath is peeled off, the signal line remains having the shield layer, so that the shielding performance is maintained even when the signal line is exposed, and the deterioration of the shielding property due to the stripping is reduced.
[0032]
If a shielded cable is used in which the drain line is configured at a predetermined position in the sheath, the position of the drain line is easy to understand, and the sheath is peeled off to expose the drain line, or the sheath is opened with a slit to open only the drain line. work or out to take on the outside becomes easy.
[0033]
In addition, this invention is not limited to such embodiment at all, Of course, it can implement with a various aspect in the range which does not deviate from the summary of this invention. For example, although the description has been made using a cable having a shield tape as a shield layer, it may be a shield such as a metal foil or a metal knitted wire, and the drain wire may be a plurality of strands or a single wire. Is applicable. Further, the drain line connection of three shielded cables has been described, but it goes without saying that the present invention can also be applied to shielded cables of a larger number.
[0034]
【The invention's effect】
According to the shielded cable according to the present invention, the drain wire exposed from the end of each shielded cable of the plurality of shielded cables is connected to the drain wire of the other shielded cable, and the drain wires of each shielded cable are connected continuously. Since it is configured as a wire, ground connection can be easily performed collectively by connecting a ground terminal to any of the exposed portions. That is, joint connectors and lead wires for concentrated connection as in the prior art are not required.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a connection structure of drain lines of a plurality of shielded cables according to an embodiment of the present invention.
FIG. 2 is a diagram showing a processing procedure for a plurality of shielded cables shown in FIG. 1;
FIG. 3 is a view showing a cross-sectional structure of a shielded cable preferably used in the present invention.
FIG. 4 is a view showing a state in which a remaining portion of the drain line is fixed to the cable by taping.
FIG. 5 is a view showing a modification of the embodiment of FIG. 1;
FIG. 6 is a diagram showing a cross-sectional structure of a conventional shielded cable applied to the present invention.
FIG. 7 is a view showing a cross-sectional structure of a shielded cable preferably used in the present invention.
FIG. 8 is a view showing a cross-sectional structure of a shielded cable that is also preferably used in the present invention.
FIG. 9 is a diagram showing a schematic configuration of a drain connection structure of a plurality of shielded cables generally used conventionally.
[Explanation of symbols]
1A, 1B, 1C, 1D, 1E, 1F Shielded cable 2, 2a, 2b Slit 3, 3a, 3b Slit 4 Ground terminal 5 Connector terminal 6 Tape 7 Crimp terminal 8 Marking 10 Wire harness Wa Signal line Wb Sheath Wd Drain line We Shield tape (shield layer)

Claims (7)

There is a drain line over the signal line to the total length of the shielded cables a plurality of shielded cables with shielding layer for shielding of the signal line and the conductive drains lines and their shielding layer formed by coating with a sheath A drain cable exposed from the end of each shielded cable is connected to a drain line of another shielded cable, and the drain line of each shielded cable is configured as a continuous line. .   When the drain line is cut into a plurality of shield cables of a predetermined size, a signal cable and a shield layer of the shield cable are cut together with a sheath, and the drain line is cut. The shielded cable according to claim 1, wherein the shielded cable is formed as a continuous line that is bare from the sheath.   A slit having a predetermined length along the length direction is formed in the cut portion of the sheath, and after the drain wire is taken out of the slit, only the signal line and the shield layer are cut together with the sheath in the middle portion of the slit. 3. The shielded cable according to claim 2, wherein the drain line is left as a continuous continuous line without being cut.   4. The shielded cable according to claim 1, wherein the shielded cable is of a single core type having one signal line, has a shield layer on the outer periphery of the signal line, and has a drain line positioned outside thereof. A shielded cable according to any one of the above.   The shielded cable is a multi-core type having a plurality of signal lines, each of the plurality of signal lines has a shield layer on the outer periphery, and a drain line is positioned outside thereof, and a plurality of signal lines The shielded cable according to any one of claims 1 to 3, wherein the shielded cable has any one of a configuration in which a shield layer is provided on the outer periphery thereof and a drain line is positioned on the outer side thereof.   The shielded cable according to any one of claims 1 to 5, wherein the drain line is configured at a predetermined position in the sheath without being twisted with the signal line.   The shield cable according to any one of claims 1 to 6, wherein a marking indicating a position of a drain wire in the shield cable is provided on a sheath outer surface of the shield cable.

Images