JP2013123019A - Shield structure of electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield structure of an electric wire which enables simplification of earth connection processing of a shield wire and a shield layer.SOLUTION: One or a plurality of electric wires each formed by coating a core wire with an insulation coating layer are inserted to a metallic pipe and terminal portions of the electric wire are protruded from both ends of the metallic pipe, so as to form a pseudo shield wire in which the metallic pipe serves as a shield layer formation material and an armoring material. An end in the metallic pipe length direction of the pseudo shield wire is fitted to a ring portion installed in a shield bracket by caulking or screwing.

Description

  The present invention relates to a shield structure for an electric wire, and more particularly, to make a widely used electric wire whose core wire is covered with an insulating resin layer as a shielded electric wire and to easily connect the shield layer of the shielded electric wire to the ground. .

  In recent years, shield wires wired to automobiles have been increasing in order to shield noise generated from motors and sensors arranged in automobiles.

  The shield wire is formed by covering a metal wire with a metal braided tube or winding a metal foil tape around the outer periphery of one or a plurality of covered electric wires whose core wires are coated with an insulating resin layer, and the outer peripheral surface of the shield layer is insulated with an insulating resin. It is configured to be covered with an outer skin (sheath) made of layers. In other words, the production cost is high because the shielded layer and the sheath are covered with a widely used covered electric wire.

Further, since the shield layer needs to be grounded, conventionally, a lead wire is connected to the end of the shield layer, and the ground terminal connected to the end of the lead wire is bolted to the vehicle body panel. When grounding the shield layers of multiple shielded wires together, connect the terminal connected to the end of the lead wire to the ground joint connector, and connect the ground terminal connected to the ground joint connector to the vehicle body panel in the same way as above. It is bolted.
In the shield layer ground connection structure, it is necessary to connect a lead wire to the shield layer, and connect the terminal of the lead wire to the ground terminal or the terminal to be inserted and locked to the ground joint connector, which increases the number of parts and work. There is a problem to do.

A shield bracket that is electrically connected to the shield layer of the shield wire is provided to eliminate the need for the connection between the shield layer and the lead wire and the terminal connection of the lead wire terminal, and the shield bracket is bolted to the metal case or body panel of the device. Sometimes it stops.
Conventionally, in the shielded wire terminal connection structure described in Japanese Patent Application Laid-Open No. 2010-160957, a C-shaped base ring 101 is provided on the outer periphery of the sheath 100a of the shielded wire 100 as shown in FIGS. The metal braided tube 100b of the shield layer of the shielded electric wire 100 is folded and covered on the outer peripheral side of the base ring 101, and the crimping ring 102 is crimped and crimped to the outer peripheral surface of the folded metal braided tube. . At that time, the C-shaped base ring 101 cannot receive the caulking force in the gap between the tips, and there is a problem that the holding of the metal braided tube is not stable. For this reason, the caulking ring 102 is provided with a thick portion 102 a that is thicker than other portions, and the thick portion 102 a is projected toward the gap C between the end faces of the base ring 101.

JP 2010-160957 A

  In the ground connection structure of the shield layer of the shielded electric wire of Patent Document 1, there is a problem that many man-hours are required. That is, the step of peeling the sheath at the end of the shielded wire to expose the metal braided tube, the step of covering the base ring on the sheath, the step of folding the metal braided tube and covering the base ring, the metal braid of the portion covered by the base ring A process of covering the tube with the ring of the shield bracket and a process of crimping the ring are required. There are many management points, such as the need to manage the length dimension in the process, and there is a problem that the number of work steps is increased and the cost increases.

  Further, as the shielded electric wire, a shielded wire that is widely used is used in which the outer periphery of the core wire made of an insulation-coated electric wire is covered with a shield layer, and the shield layer is covered with a sheath, and the shielded electric wire itself tends to be enlarged. And expensive. As described above, when a shielded electric wire is used, there is a problem that the cost is increased because the conventional method requires many man-hours for grounding the shield layer and the shielded electric wire itself is expensive. In addition, the conventional shielded electric wire has a low protection function against external interference materials. Therefore, the shielded electric wire is covered with a corrugated tube made of a resin molded product, or a protector is formed in an area where the external interference material is located. It is necessary to pass through.

  The present invention has been made in view of the above problems, has a configuration in which the protection function of the shielded electric wire itself is increased and the cost is reduced, and the connection structure between the shield layer and the shield bracket is simplified, and the number of work steps is reduced. The challenge is to reduce costs.

In order to solve the above-mentioned problem, the present invention inserts one or a plurality of electric wires whose core wires are covered with an insulating coating layer into a metal pipe and projects end portions of the electric wires from both ends of the metal pipe, Provide a pseudo shielded electric wire with the metal pipe as a shield layer forming material and an exterior material,
A wire shield structure is provided in which the end portion in the length direction of the metal pipe of the pseudo shielded electric wire is swaged or screwed with a ring portion provided on a shield bracket.

As described above, in the present invention, a generally used insulated wire is used instead of a commonly used shielded wire, and the wire serves as a shield layer, a sheath, and an exterior protective material. Pseudo shielded electric wire is passed through the pipe made. If the pseudo shielded electric wire needs to be bent according to the wiring area, the pipe is bent after passing the electric wire through the metal pipe.
In this way, since a widely used electric wire is passed through a metal pipe as a pseudo shielded electric wire, the shielded electric wire itself can be made cheaper than the conventional one, and an exterior material such as a corrugated tube is not required. The number of points and work man-hours can be reduced.

  In addition, since the shield layer is formed of a metal pipe, the shield layer can be easily secured simply by fixing the metal pipe to a shield bracket formed from a metal plate and fixing the shield bracket to a metal case or body panel of the device. Can be grounded. That is, it is only necessary to crimp and screw the ring portion provided integrally with the shield bracket onto the metal pipe, so that the work process can be greatly reduced as compared with Patent Document 1. And since the shield layer which consists of metal pipes has rigidity, the coupling | bonding force with the ring part provided in a shield bracket can be improved.

When the ring portion protruding from the shield bracket is a caulking ring, the caulking ring is externally fitted to the outer peripheral surface of the metal pipe and caulked.
Since the caulking ring is provided integrally with a shield bracket made of a metal plate, the metal plate is bent to have a cylindrical shape with a slit. The caulking ring is fitted to the outer periphery of the end of the metal pipe and caulked. At that time, since the metal pipe is annular, it is possible to receive the caulking force, and the caulking ring can be firmly crimped to the metal pipe of the pseudo shielded electric wire. Therefore, the holding stability of the pseudo shielded electric wire by the shield bracket is enhanced, and the electrical connection reliability can be enhanced.
In addition, the ring part provided in a shield bracket may be inserted and inserted from the end part of the metal pipe, and the end part of the metal pipe may be crimped and crimped to the internally fitted ring part.

Alternatively, the ring portion protruding from the shield bracket causes a spiral protrusion to protrude on the outer peripheral surface, while providing a spiral groove on the inner peripheral surface of the metal pipe, and inserting the ring portion into the metal pipe. Screwed.
The ring portion protruding integrally with the shield bracket made of the metal plate has an end-cylinder shape, but the rear outer peripheral surface is cut to project the spiral protrusion. On the other hand, the inner peripheral surface on the terminal side of the metal pipe is also cut to provide a spiral groove. The helical groove and the protrusion are preferably screwed by rotating the shield bracket side.
When the ring portion of the shield bracket and the metal pipe of the pseudo shielded electric wire are fixed by screwing as described above, the caulking work using the caulking tool can be omitted, and the work can be simplified. A spiral groove is provided on the inner peripheral surface of the ring portion provided on the shield bracket, a spiral protrusion is provided on the outer peripheral surface of the metal pipe, and the ring portion of the shield bracket is externally fitted to the metal pipe and screwed together. May be.

  Connect the terminal connected to the wire end protruding from the tip of the metal pipe to the connector, fix the connector to the shield bracket, and insert it into the connector fitting part provided in the equipment to which the shield bracket is fixed It is preferable to do. The shield bracket may be fixed to the vehicle body panel.

It is preferable that the metal pipe is made of an aluminum-based metal and is arranged in an engine room of an automobile, and the metal pipe is bent according to the arrangement form.
The metal pipe is not limited to an aluminum-based metal, but is advantageous in that it is lightweight and has good workability. Further, the wiring area is not limited to the engine room, but since the equipment is densely arranged in the engine room, the pseudo-shielded electric wire of the present invention is wired from the viewpoint of shielding properties and protective functions, and the metal pipe It is preferable to form a shield layer and a protective layer.

  As described above, in the present invention, since a general-purpose electric wire having a core wire covered with an insulating coating layer is passed through a metal pipe as a pseudo shielded electric wire, the required number of core wires and the required length of the pseudo shielded electric wire are simple and inexpensive. Can be obtained. In addition, since the metal pipe of the pseudo shielded electric wire can be coupled by crimping or screwing with a ring portion provided on the shield bracket, the ground connection work process of the shield layer can be greatly simplified as compared with the conventional case.

The pseudo shield electric wire of the present invention is shown, (A) is a perspective view of the electric wire, (B) is a perspective view showing the electric wire and the metal pipe, and (C) is a state in which the electric wire is inserted into the metal pipe to make the pseudo shield electric wire. It is a perspective view shown. (A) is a front view which shows the state which connected the terminal to the terminal of the said pseudo shield electric wire, (B) is the schematic which shows the state which connected the said terminal to the connector. It is drawing which shows the ground connection state of a pseudo shield electric wire while connecting the connector connected to the said pseudo shield electric wire to an apparatus. (A), (B) is a perspective view of a shield bracket. (A) is a perspective view which shows the state which crimped and crimped the metal pipe of the pseudo shield electric wire to the crimping ring part of a shield bracket, (B) is a BB sectional drawing of (A). It is the schematic which shows 2nd Embodiment. It is the schematic which shows 3rd Embodiment. (A) (B) is drawing which shows a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
All of the following embodiments are directed to shielded wires that are routed in an engine room in an automobile.

1 to 5 show a first embodiment.
As shown in FIG. 1, a single electric wire 1 in which a core wire 1a made of a twisted copper metal wire is covered with an insulating coating layer 1b made of an insulating resin is inserted into a metal pipe 2 made of an aluminum metal, The pseudo shielded electric wire 10 is used. The metal pipe 2 has three functions of a shield layer, a sheath (sheath) of a conventional shielded electric wire that is widely used, and an exterior protective material that fits outside the shielded electric wire such as a corrugated tube. The pseudo shielded electric wire 10 is bent when the electric wire 1 is inserted into the metal pipe 2 and needs to be bent according to the routing route. In addition, although the magnitude | size of the hollow part of the metal pipe 2 is made into the magnitude | size which can penetrate the electric wire 1 smoothly, it is set as the dimension which does not open an excessive clearance gap between the outer peripheral surface of the electric wire 1, and the inner peripheral surface of the metal pipe 2. . Therefore, a shield layer made of a metal braided tube is provided on the outer periphery of the conventional core wire, the shield layer is covered with a sheath, and the outer diameter of the pseudo shielded electric wire 10 is made larger than the outer diameter of the shielded wire covered with a corrugated tube It is thin.

  At both ends in the length direction of the pseudo shielded electric wire 10, as shown in FIG. 2, the required length of the electric wire 1 is projected from the metal pipe 2, and the insulation coating layer 1b is peeled off at the end of the electric wire 1, The terminal 3 is crimped and connected to the exposed core wire 1a and is inserted and locked to the connector 5.

  As shown in FIG. 3, the connector 5 is fitted to a connector fitting portion of a device 12 having a metal case 12a to which a shield bracket 11 made of a metal plate is bolted. As shown in FIG. 4, the shield bracket 11 fixes a bolt hole 11 a provided in the substrate 11 b to the metal case 12 a of the device 12 with a bolt B, and a connector fitting portion provided with the connector 5 inside the device 12. To be connected to.

  As described above, the shield bracket 11 is provided with the bolt holes 11a in the rectangular substrate 11b, bent at 90 degrees from a portion protruding from one end of the substrate 11b, and then bent into an annular shape. A caulking ring portion 11r having a cylindrical shape (a shape having a slit in the cylindrical portion) is provided.

  As shown in FIG. 5, the tip of the metal pipe 2 of the pseudo shielded electric wire 10 is passed through the caulking ring part 11 r of the shield bracket 11, and the caulking ring part 11 r located on the outer peripheral surface of the metal pipe 2 is caulked and crimped. Since the metal pipe 2 has an endless annular shape having rigidity during the caulking, the caulking force applied by the caulking ring portion 11r can be sufficiently received and the caulking can be firmly crimped. In this manner, one end side of the pseudo shielded electric wire 10 is fixedly held on the shield bracket 11 via the metal pipe 2 and connected to the metal pipe 2.

  After the metal pipe 2 of the pseudo shielded electric wire 10 is caulked and fixed via the shield bracket 11 and the caulking ring portion 11r, the electric wire 1 protruding from one end of the metal pipe 2 is connected to the connector 5 as shown in FIG. Then, the connector 5 is set on the shield bracket 11. Thereafter, the connector 5 is fitted into a connector fitting portion 12b provided inside the device 12, and the shield bracket 11 is bolted to the metal case 12a of the device 12. Thus, the metal pipe 2 that functions as the shield layer of the pseudo shielded electric wire 10 is grounded by fixing the metal pipe 2 of the pseudo shielded electric wire 10 to the metal case 12a of the device 12 through the shield bracket 11. Can do. In addition, one end side of the pseudo shielded electric wire 10 can be fixed to the device 12 via the shield bracket 11.

  The shield bracket 11 may be fixed to a metal body panel, and the metal pipe 2 of the pseudo shielded electric wire 10 may be grounded to the body panel.

  As described above, since the pseudo shielded electric wire 10 simply passes the commonly used electric wire 1 through the metal pipe 2, the outer diameter can be reduced and the diameter can be reduced. In addition, since the metal pipe that also serves as the shield layer of the pseudo shielded electric wire 10 has an endless annular shape having rigidity, the end crimped ring portion provided integrally with the shield bracket 11 can be firmly crimped and fixed. By fixing the shield bracket 11 to the metal case or body panel of the device, the terminal treatment process for grounding the shield layer made of the metal pipe 2 of the pseudo shielded electric wire 10 can be simplified as compared with the prior art, and the cost can be reduced. Can be achieved.

FIG. 6 shows a second embodiment.
In the second embodiment, instead of providing a caulking ring portion on the shield bracket 11, the outer peripheral surface of the ring portion 11c of the end tube portion is cut to provide a thread 11m made of a spiral protrusion. . On the other hand, a thread groove 2m is provided on the inner peripheral surface of one end of the metal pipe 2 of the pseudo shielded electric wire 10. The metal pipe 2 and the shield bracket 11 are fixed by inserting the ring portion 11c of the shield bracket 11 into the metal pipe 2 and aligning the thread 11m with the thread groove 2m and rotating the shield bracket 11.
Other configurations and operational effects are the same as those of the first embodiment, and thus description thereof is omitted.

  In the second embodiment, a caulking operation using a caulking tool is not required, and it is only necessary to screw the metal pipe 2 of the pseudo shielded electric wire 10 and the ring portion 11c of the shield bracket 11 together. Therefore, there is an advantage that the ground connection work of the shield layer of the pseudo shielded electric wire 10 can be greatly simplified.

FIG. 7 shows a third embodiment.
Although the pseudo shielded electric wire 10 of the first and second embodiments has one electric wire 1 inserted through the metal pipe 2, the pseudo shielded electric wire 10B of the third embodiment has two or more (four). The electric wire 1 is inserted into one metal pipe 2 to form a pseudo shielded electric wire having a large number of electric wires. Similar to the first embodiment, the metal pipe 2 of the pseudo shielded electric wire 10B is crimped and crimped to a crimping ring provided on the shield bracket.
In addition, since the other configurations are the same as those of the first embodiment, such as inserting and locking the terminals respectively connected to the terminals of the plurality of wires 1 of the pseudo shielded wire 10B to the connector set on the shield bracket, the description is omitted. To do.

DESCRIPTION OF SYMBOLS 1 Electric wire 1a Core wire 1b Insulation coating layer 2 Metal pipe 5 Connector 10 Pseudo shield electric wire 11 Shield bracket 11c Ring part 11r Clamping ring part 12 Equipment

Claims (5)

One or a plurality of electric wires whose core wires are covered with an insulating coating layer are inserted into a metal pipe, and end portions of the electric wires are projected from both ends of the metal pipe, so that the metal pipe is shield layer forming material and exterior material Provide a pseudo shielded wire,
The shield structure of the electric wire which carries out the caulking fitting or screwing of the end part of the metal pipe of the said pseudo shield electric wire in the length direction with the ring part provided in the shield bracket.   The wire shield structure according to claim 1, wherein the ring portion protruding from the shield bracket is a caulking ring, and is externally fitted to the outer peripheral surface of the metal pipe and caulked.   The ring portion protruding from the shield bracket causes a spiral protrusion to protrude on the outer peripheral surface, while a spiral groove is provided on the inner peripheral surface of the metal pipe, and the ring portion is inserted into the metal pipe and screwed. The electric wire shield structure according to claim 1.   The structure is configured such that the end of the metal pipe is abutted against the shield bracket, and a terminal connected to a terminal portion of the electric wire protruding from the end of the metal pipe is inserted into a connector coupled to the shield bracket for connection. The shield structure according to any one of claims 1 to 3.   5. The metal pipe according to claim 1, wherein the metal pipe is made of an aluminum-based metal, and is arranged in an engine room of an automobile, and the metal pipe is bent according to the arrangement form. 6. Wire shield structure.

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