JP2007184172A - Grounding structure of shield wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ground a shield wire with the small number of components without lowering a shielding property thereof. <P>SOLUTION: A cover of a sheath wire 13 is peeled off with a minimum length L by which a grounding terminal 20 can be crimped to a terminal part of a drain wire 14. In case of grounding a plurality of shield wires 10A to 10C arranged in parallel with each other, the length La to Lc of the cover peeled off from sheath wires 13A to 13C are set in minimum length by which grounding terminals 21A to 21C can be crimped to the terminal part of drain wires 14A to 14C, and a plurality of crimped terminals 21A to 21C can be directly combined. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shield wire ground connection structure, and in particular, in a shield wire ground connection structure arranged in an automobile, the sheath peeling length is shortened to improve the shield performance.

  Conventionally, a shielded wire in which a plurality of wires or one electric wire (core wire) is passed through a braided tube or metal foil made of metal fiber and the metal braided tube or metal foil is covered with a sheath (insulating coating) is shielded. The metal braid or metal foil must be grounded.

In the shielded electric wire shielded by using the metal braided tube, as a technique for grounding the metal braided tube, as shown in FIG. 8, the end of the sheath 1a of the shield wire 1 is peeled to expose the metal braid. At the same time, it is turned into a drain wire 1b, the drain wire 1b and the grounding wire 3 are connected via a terminal 2, and the terminal 3a at the end of the grounding wire 3 is connected to a joint connector (not shown). Is grounded to the vehicle body panel etc.
Alternatively, as shown in FIG. 9, the terminal 4 is directly connected to the tip of the drain wire 1b without using the grounding wire, and the terminal 4 is inserted into a connector (not shown) to connect the connector (not shown). There is also a method of grounding to the vehicle body panel etc. via

  Further, there is a permanent connection technique such as resistance welding (see Japanese Patent Application Laid-Open No. 2000-268893 (patent document)). Specifically, as shown in FIG. 10, the stripping positions P1 of the drain wires 5a to 5f of the plurality of shield wires 5A to 5F are aligned, and the drain wires 5a to 5f and the grounding wire 6 are both tape 7. The drain wires 5a to 5f and the ground core wire 6a that are bound and exposed from the tip of the tape 7 are subjected to concentrated resistance welding, and the ground terminal 6b connected to the other end of the ground wire 6 is grounded to the vehicle body panel or the like. is doing.

  The drain wire is wired together with the core wire, the metal foil is wound around the core wire, the drain wire is connected to the metal foil, and the shield wire in which the metal foil is insulated with the sheath is also connected to the drain by grounding. As in the case of using a braided tube, the sheath is peeled to expose the drain wire, and a crimp terminal is connected to the tip of the drain wire to connect to the terminal of the ground wire terminal. Similarly to the case of using the metal braid, when a terminal crimped to the tip of the drain wire is connected to the joint connector, the drain wire and the ground wire may be subjected to terminal concentration welding.

  Of the three methods, the method using the grounding wire 3 is a method suitable for the case where the connection destination (device) of the core wire 1c is separated from the ground point. However, a plurality of shield wires are connected to the ground. In this case, grounding wires and connection terminals are required for the number of shield wires, which increases the component cost and processing cost. Further, since the sheath 1a is peeled from the terminal to the branch position of the drain wire 1a, the exposed length of the core wire 1c and the drain wire 1a is also increased when the peeling length dimension is increased for convenience of wiring design. Decrease in shielding performance becomes a problem.

  In the method of directly connecting the grounding terminal 4 to the tip of the drain wire 1b without using the grounding wire, the sheath 1a is used to lengthen the drain wire 1b when the connection destination of the core wire 1c is away from the ground point. It is also necessary to lengthen the skin length, and the deterioration of the shielding performance becomes more remarkable.

  The permanent connection method eliminates the need for a connector even when a plurality of shield wires are grounded, and has advantages such as a reduction in the number of components and effective use of a wiring harness wiring space. However, since a plurality of drain wires 5a to 5f are bundled and connected using dedicated equipment, the number of man-hours in the harness assembling process is increased, and due to equipment requirements, the stripping length dimension is required to be 100 mm or more as work dimensions, There is still room for improvement in shielding performance.

JP 2000-268893 A

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a shield wire ground connection structure that has high shielding performance, a small number of parts, and good workability.

In order to solve the above problems, the present invention is a ground connection structure of a shield wire,
The sheath of the shield wire is peeled off, and a ground terminal is directly crimped and connected to the end of the drain wire formed by pulling out the metal braid or the drain wire connected to the metal foil. The dimensions are set to the shortest length that allows the ground terminal to be crimped and connected to the drain wire end, and the ground terminal is fixed with the bolts and nuts of the vehicle body to provide a ground connection structure for the shielded wire. Yes.

  Thus, by setting the skin peeling length dimension of the sheath to the shortest length, the lengths of the core wire and the drain wire exposed from the sheath can be shortened, and a decrease in shielding performance can be suppressed as much as possible. Therefore, it is possible to achieve both high shield performance and work dimensions for crimping and connecting the terminal to the drain wire terminal. Moreover, the grounding wire can be made unnecessary by directly crimping and connecting the grounding terminal to the drain wire.

  The shortest peeling length of the sheath is about 50 mm in consideration of the working size when crimping and connecting the terminal to the drain wire end, and is about half that of 100 mm required for resistance welding or the like. it can.

Further, the present invention is a ground connection structure of the shield wire,
The shield wire consists of a plurality of parallel wires. The sheath of the shield wire is peeled off, and the ground terminal is directly crimped to the drain wire formed by pulling out the metal braid or the drain wire connected to the metal foil. Connected
The sheath peeling length dimension is set to the shortest length in which the ground terminal can be crimped and connected to each drain wire terminal, and a plurality of these grounded terminals can be directly combined, and the combined plural A ground connection structure for a shielded wire is provided, wherein the ground terminal is fixed to the vehicle body with bolts and nuts and can be connected to the ground.

With the above configuration, even when a plurality of shielded wires connected in parallel are connected to the ground, the exposed portions of the core wires and drain wires can be minimized, and a reduction in shield performance can be suppressed as much as possible. Work dimensions for connecting terminals to wires can also be secured.
Furthermore, if multiple drain wires are combined and grounded to the vehicle body with a single bolt and nut, multiple ground connection operations can be performed once, joint connectors are not required, and the number of parts can be reduced. Costs can be reduced and workability is reduced with fewer man-hours.

If the bolt hole cannot be set on the side of the vehicle body to be connected to the ground terminal directly connected to the terminal of the drain wire, that is, if the ground point is separated, the ground terminal connected to the drain wire by crimping is connected to the ground terminal. A terminal connected to one end of the wire is connected, a ground terminal is connected to the other end of the ground wire, and it is fixed to the vehicle body with bolts and nuts so that it can be connected to the ground.
That is, a ground wire is further connected to the ground terminal of the drain wire terminal to extend to the ground point. In this case, it is preferable that the terminal on the ground wire side connected to the ground terminal of the drain wire terminal is also connected as a terminal with a round hole by fastening with bolts and nuts.

In this way, if the length of the ground wire connected to the drain wire is set to be as long as the drain wire is the shortest length, even if the connection point of the core wire is far away from the ground point, the ground performance is not reduced. Connection is possible, and the freedom of wiring design can be secured.
Further, it is possible to connect the drain wires and connect the drain wire and the ground wire in the harness assembling process, and the wiring workability can be improved.

As described above, according to the present invention, the sheath of the shield wire is peeled off and the length of the drain wire formed by pulling out the metal braid, or the sheath which is peeled by wiring with the core wire in contact with the metal foil The length of the drain wire that is drawn out is the shortest dimension that can be crimped and connected to the crimp terminal, so that the length of the core wire that is not shielded by the metal braid or metal foil can be minimized, and it has high shielding performance. can do. Further, since the ground terminal of the terminal of the drain wire can be directly connected to the vehicle body, the ground wire can be dispensed with.
Further, when connecting a plurality of shielded wires wired in parallel to each other, according to the present invention, when ground terminals connected to the terminals of a plurality of drain wires are overlapped and connected to the vehicle body by bolts and nuts, a plurality of ground wires are connected. Connection work can be performed simultaneously. Therefore, the number of work steps and the number of parts can be reduced, and the cost can be reduced.

  In addition, if the drain wire is shortened and the ground terminal is connected to the drain wire terminal to leave the ground point on the vehicle body side, the ground wire is connected to the ground terminal of the drain wire terminal to separate the ground wire. Connection to points is also possible, and the degree of freedom in wiring design can be secured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In any of the embodiments, the present invention is applied to the ground connection structure of the shielded wire arranged in the automobile, and the drain wire is grounded to the vehicle body panel.

1A and 1B show a first embodiment of the present invention and show a ground connection structure of one shielded wire.
The shield wire 10 passes a plurality of core wires 11 connected to an in-vehicle device (not shown) through a metal braided tube 12, and the outer periphery of the metal braided tube 12 is covered with a sheath 13. The end of the shielded wire 10 forms a drain wire 14 with the metal braided tube 12 exposed by peeling off the sheath 13.
The skin peel length L of the sheath 13 is set to 50 mm, which is the shortest length that allows the ground terminal 20 to be crimped to the end of the drain wire 14. The ground terminal 20 is a round terminal in which a crimping barrel 20a is caulked and crimped to a drain wire 14, and a bolt hole 20c is provided in the center of a round electric connecting portion 20b projecting from a forming portion of the crimping barrel 20a.

  The ground terminal 20 which is directly crimped and connected to the end of the drain wire 14 is arranged by connecting the bolt hole 20c of the ground terminal 20 to the bolt hole 41a of the vehicle body 41 after routing the shield wire 10 to the vehicle body. Bolts 37 through bolt holes 41a and 20c are screwed and fixed to nuts 38 welded to the back side, and are connected to ground.

  According to the ground connection structure, since the skin peeling length L is the shortest length, a work space for crimping and connecting the terminal 20 to the end of the drain wire 14 can be secured, and the sheath 13 can be peeled off. Thus, the lengths of the drain wire 14 and the core wire 11 drawn out can be minimized, and a reduction in shield performance of the shield wire 10 can be suppressed as much as possible.

2A and 2B show the second embodiment. The difference from the first embodiment is that the shielded wire 10 'is shielded by using a metal foil 12' instead of shielded by using a metal braid. A drain wire 14 ′ that is not covered with insulation is wired together with the core electric wire 11 to the metal foil 12 ′, and the drain wire 14 ′ is brought into contact with the metal foil 12 ′. That is, the shielding metal foil 12 ′ is wound around the outer peripheral surfaces of the core wire 11 and the drain wire 14 ′, and the outer peripheral surface is covered with the sheath 13.
Also in the shielded electric wire 10 ′, as in the first embodiment, the sheath 13 is peeled off by the shortest dimension capable of crimping the ground terminal 20 to the end of the drain wire 14 ′.
Other configurations and operational effects are the same as those of the first embodiment, and thus description thereof is omitted.

3 (A) and 3 (B) show a third embodiment. As in the first embodiment, a shielded wire shielded with a metal braid is used as an object, and a ground terminal 20 connected to the end of a drain wire 14 is connected to the vehicle body side. In this case, a ground wire 30 that can be extended to the ground point is connected.
That is, the ground terminal 31 connected to one end of the ground wire 30 by crimping is connected to the ground terminal 20 of the drain wire terminal with a bolt 33 and a nut, and the ground terminal 32 connected to the other end of the ground wire 30 is used as the ground point of the vehicle body. It is fixed with bolts and nuts.
Since the ground terminals 20 and 31 connected to each other are not directly connected to the vehicle body, they serve as round terminals that are fastened with bolts and nuts. Therefore, it is good also as a structure which carries out the fitting connection within a connector as a male terminal and a female terminal by which a male-female fitting is carried out instead of the round terminal fastened with a volt | bolt and a nut.

Thus, by setting the length of the ground wire 30 to the extent that the length of the drain wire 14 is minimized, it is possible to connect to a ground point away from the in-vehicle device 42 to which the core wire 11 is connected. . That is, while the drain wire 14 is always set to the shortest dimension, by adjusting the length of the ground wire 30, it is possible to secure the degree of freedom of routing while providing high shielding performance.
In the case of a shielded wire using a metal foil as a shield, similarly, a case where the ground terminal 20 connected to the drain wire terminal cannot be connected to the ground point on the vehicle body side is shown. 30 is connected.

4 and 5 show a fourth embodiment of the present invention and show a ground connection structure of two shielded wires 10A and 10B wired in parallel.
As shown in FIG. 4, the terminals of the shield wires 10A and 10B are peeled off the sheaths 13A and 13B to form drain wires 14A and 14b. The terminals of these drain wires 14A and 14B are shown in FIG. Such combination earth ends 22 and 23 are crimped and connected.

The combination ground terminals 22 and 23 have the same shape as the combination ground terminal provided in Japanese Patent Application Laid-Open No. 2003-132970 related to the applicant's application.
That is, bolt holes 22b and 23b are provided in the electrical contact portions 22a and 23a of the ground terminals 22 and 23, and lock claws 22c and 23c and locking holes 22d and 23d which are locked to each other are provided at the peripheral portions. When these ground terminals 22 and 23 are overlapped, the lock claw 22c is locked to the locking hole 23d, and the lock claw 23c is locked to the locking hole 22d to be combined.

The sheath lengths La and Lb of the sheaths 13A and 13B are the shortest that the ground terminals 22 and 23 can be crimped and connected to the ends of the drain wires 14A and 14B, respectively. It is a length.
The vehicle body is fixed to the ground point by arranging the bolt holes 22b and 23b of the ground terminals 22 and 23 in communication with the bolt holes of the vehicle body and fastening and fixing with one bolt 37 and a nut as in the first embodiment. Yes.

6 and 7A to 7C show a fifth embodiment of the present invention.
In the fifth embodiment, ground terminals (round terminals) 21A to 21C are crimped and connected to the terminals of the drain wires 14A to 14C of the three shielded wires 10A to 10C arranged in parallel, and the three ground terminals 21A to 21C are connected to each other. The ground terminal 31 at one end of the ground wire 30 is overlapped and fastened with a bolt and a nut. The ground terminal 32 at the other end of the ground wire 30 is fixed to the ground point of the vehicle body with bolts and nuts.

Specifically, when overlapping the round terminals 21A to 21C, as shown in FIG. 6, the round terminals 21A and 21C connected to the terminals of the drain wires 14A and 14C wired at the left and right ends are wired in the center. Then, it is bent in the direction of a round terminal 21B with a bolt hole connected to the terminal of the drain wire 14B, and the electrical contact portions 21A-2 to 21C-2 of the terminals 21A to 21C are overlapped at the position of the terminal 21B. At this time, the electrical contact portions 21A-2 to 21C-2 are brought into surface contact with each other, and the positions of the crimping portions 21A-3 to 21C-3 of the terminals 21A to 21C are shifted from each other so as not to overlap.
In the present embodiment, the sheath peeling length dimensions La, Lb, and Lc of the drain wires 14A, 14B, and 14C are set to 50 mm in consideration of the shortest working dimension for terminal crimping.

  As shown in FIGS. 7A to 7C, the round terminals 31 connected to one end of the ground wire 30 are further overlapped with the round terminals 21 </ b> A to 21 </ b> C thus superposed on each other. Similarly to the round terminals 21A to 21C, the round terminal 31 is formed by continuously integrating an annular electrical contact portion 31-2 having a bolt hole 31-1 in the center thereof and a crimp portion for crimping connection 31-3 with the electric wire. Be prepared for. The crimping portion 31-3 is displaced in the circumferential direction from the crimping portions 21A-3 to 21C-3 of the other terminals 21A to 21C to be overlapped so as not to overlap each other.

As shown in FIG. 7B, a bolt 39 is inserted into the bolt holes 21A-1 to 21C-1 in which the four round terminals 21A to 21C, 31 are overlapped and communicated with each other. As shown in FIG. 7 (C), the electrical contact portions 21A-2 to 21C-2 and 31-2 of the terminals 21A to 21C and 31 are brought into surface contact with each other and electrically connected to each other. .
A ground terminal 32 is connected to the other end of the ground wire 30, and the ground terminal 32 is fixed to the vehicle body panel 41 with bolts 37 and nuts 38 to be grounded.

In the present embodiment, since the sheath peeling lengths La to Lc of the shield wires 10A to 10C are minimized, the core wires 11A to 11C and the drain wires 14A to 14C are exposed as in the first embodiment. The amount is small and high shielding performance can be provided. In addition, since the ground connection can be made with only one ground wire 30 and two terminals 31 and 32 to the plurality of shield wires 10A to 10C, the number of ground wires and terminals used can be reduced, and the cost can be reduced. Workability is also improved. Furthermore, since a joint connector is not required and a connector installation space is available, a limited wire harness wiring space can be used effectively.
Furthermore, with this ground connection structure, the wiring assembly workability is improved because the harness assembly process can complete up to the point where the ground wire 30 is connected to the drain wires 14A to 14C.
Both the fourth and fifth embodiments have been described with the shield wire provided with the metal braid, but the metal foil is used as a shield, the shield wire is brought into contact with the metal foil, and the metal foil is insulated with the sheath. Of course, it can also be applied to shielded wires.

1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a plan view showing a ground connection structure of a shield wire, and FIG. 1B is a cross-sectional view of a ground connection portion with a vehicle body. A 2nd embodiment is shown, (A) is a top view showing the ground connection structure of a shield wire, and (B) is a BB line sectional view of (A). The third embodiment of the present invention is shown, (A) is a plan view showing a ground connection structure of a shield wire, (B) is a side view of the main part. It is a top view which shows the earth connection structure of the shield wire which concerns on 4th embodiment of this invention. (A) (B) (C) is a perspective view which shows the combination operation | work of the ground terminal used by 4th embodiment. It is a top view which shows the earth connection structure of the shield wire which concerns on 5th embodiment of this invention. (A) is a top view which shows the connection state of 5th embodiment, (B) is an exploded perspective view of a terminal connection part, (C) is a side view of a terminal connection part. It is a figure of a prior art example. It is a figure of another prior art example. It is a figure of another prior art example.

Explanation of symbols

10 (10A to 10C), 10 'shielded wire 13, 13A to 13C sheath 12 metal braid 12' metal foil 14 (14A to 14C), 14 'drain wire 20 ground terminal 21 (21A to 21C), 33 ground terminal 30 ground line
31 terminal 32 ground terminal

Claims (4)

A shielded wire ground connection structure,
The sheath of the shield wire is peeled off, and a ground terminal is directly crimped and connected to the end of the drain wire formed by pulling out the metal braid or the drain wire connected to the metal foil. The dimension is set to the shortest length that allows the ground terminal to be crimped and connected to the drain wire end, and the ground terminal is fixed with the bolts and nuts of the vehicle body so that the ground connection can be made. A shielded wire ground connection structure,
The shield wire consists of a plurality of parallel wires. The sheath of the shield wire is peeled off, and the ground terminal is directly crimped to the drain wire formed by pulling out the metal braid or the drain wire connected to the metal foil. Connected
The sheath peeling length dimension is set to the shortest length in which the ground terminal can be crimped and connected to each drain wire terminal, and a plurality of these grounded terminals can be directly combined, and the combined plural A ground connection structure for shielded wires, characterized in that the ground terminal can be fixed to the vehicle body with bolts and nuts and connected to the ground.   A configuration in which a terminal connected to one end of a ground wire is connected to the ground terminal crimped to the drain wire, a ground terminal is connected to the other end of the ground wire, and is fixed to the vehicle body with a bolt and a nut. The shield wire ground connection structure according to claim 1 or 2.   The shield wire ground connection structure according to any one of claims 1 to 3, wherein the sheath has a peeling length of 50 mm or less.

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