JP2002142327A - Shielding structure for electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve terminal crimping by improving the shielding structure of an electric wire. SOLUTION: A tube 10 made of highly conductive resin is provided. Inside this tube, a plurality of electric wires W1, W2 are passed so that groups of these electric wires are shielded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield structure of an electric wire, and more particularly to an improvement of a shield structure of an electric wire routed to an automobile.

[0002]

2. Description of the Related Art Conventionally, as an electric wire which needs to block noise due to electromagnetic waves, a shielded wire whose outer peripheral surface is covered with a shielding metal foil has been used. As shown in FIG. 4, this type of shielded wire is composed of a plurality of electric wires (core wires) 2 in which a conductive wire 2a is covered with an insulating resin coating and a drain wire 3 for grounding, which are bundled in this state. Wire 2 and drain wire 3 are shielded metal foil (or metal mesh)
4 and the outer periphery of the shielding metal foil 4 is further covered with an insulating resin sheath 5. The shielded wire is designed to cut off noise to the internal electric wire by the shielding metal foil 5.

[0003] When the shield wire is connected to the vehicle body ground or the like, first, as shown in FIG. 5 (A), the insulating resin sheath 5 and the shielding metal foil 4 of the terminal are peeled, and the inner electric wire 2 and the inner wire 2 are connected. The drain wire 3 is exposed, an earth terminal 6 is connected to the end of the drain wire 3, and the earth terminal 6 is fixed to a mounting hole 1 a of the vehicle body 1 with a bolt B. When the shielded electric wire is to be locked to the vehicle body, as shown in FIG. 5B, a corrugated tube 9 is attached to a protective exterior material, and a corrugated clamp 9 is fitted and fixed to the corrugated tube 8. It is fixed to the vehicle body via a corrugated clamp 9.

[0004]

The above-mentioned shielded wire has a plurality of electric wires and a single drain wire 3 twisted with respect to these electric wires inside the metal foil for shielding 4, so that the terminal connection is made. At the time of ground connection, it is necessary to perform these untwisting operations, and it is also difficult to peel the sheath 5 and the metal foil 4 by an automatic machine, resulting in poor workability. In addition, it is necessary to attach a corrugated tube to protect the shielded wire, and further attach a corrugated clamp to the corrugated tube to lock the corrugated tube to the vehicle body.

[0005] The present invention has been made in view of the above problems, and has as its object to improve the shielding structure of an electric wire to improve the workability of terminal connection and ground connection.

[0006]

In order to solve the above problems, the present invention provides a tube made of a highly conductive resin,
A wire shield structure is provided in which a plurality of wires are passed through the tube to shield these wire groups.

[0007] According to the above structure, a tube formed of a highly conductive resin is provided as an exterior material of the electric wire, and the tube is passed through the electric wire, so that the electric wire has a shielding function. Therefore, it is not necessary to use the electric wire itself as a shielded electric wire, and a shielded structure can be obtained simply by covering a normal electric wire with a tube. This eliminates the need for stripping the shielding metal foil and insulating resin sheath and untwisting the internal wires, which were necessary when shielded wires were used, thus reducing the number of terminal connection processes. Can be. In addition, in the case of crimping terminals to general electric wires that are scattered one by one from the beginning, an automatic cutting and crimping machine can be used, and the burden on the operator can be greatly reduced.

Further, in the present invention, the above-mentioned tube is used as a corrugated tube, and at the same time, the corrugated tube is provided with a function of protecting the electric wire. And the vehicle body is grounded via the corrugated clamp.

By connecting the vehicle body to the ground with the above configuration, a drain wire required when a shielded wire is used becomes unnecessary, the number of parts can be reduced, and a terminal crimping step to the drain wire is also omitted when crimping the terminal. Therefore, the workability can be improved and the cost can be reduced.

That is, the corrugated tube can provide both the function of shielding the electric wire and the function of protecting the electric wire, and can simultaneously perform the ground connection of the shield layer and the locking of the vehicle body.

The highly conductive resin used as the material for the tube and the corrugated clamp is disclosed in Japanese Unexamined Patent Publication No. 10-237331.
As disclosed in JP-A-11-342522, a thermoplastic resin mixed with metal fibers made of copper, nickel, iron or the like, lead-free solder (low melting point solder) and Cu powder And a conductive resin composition in which a low melting point alloy such as

Examples of the thermoplastic resin to which conductive metal fibers are blended include propylene, polyethylene, polystyrene, acrylonitrile / butadiene / styrene resin, modified polyphenylene oxide resin, polybutylene terephthalate resin, polyethylene terephthalate resin, polyamide resin, and aromatic resin. Polyamide resin, polyphenylene sulfide resin, liquid crystal polymer, polyetherimide,
Resins such as polybenzimidazole, polyetheretherketone, and polyethersulfone can be used alone or as a blend, and acrylonitrile-butadiene-styrene resin and polybutylene terephthalate resin are particularly preferably used.

As the low melting point alloy to be mixed and dispersed in the thermoplastic resin and bonded in a network, an alloy which has a melting point of 100 ° C. or more, preferably 200 ° C. or more and is melted in an injection molded product is used. Pb-based, Sn-Ag
-Pb system, Sn-Bi system, Sn-Bi-In system, Bi-
Pb-based, Bi-Sn-based, Sn-Cu-based, Sn-Cu-N
i-P system, Sn-Ag system, Sn-Bi-Pb system, Sn-
In-based materials may be mentioned.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

In the present embodiment, as shown in FIG. 1, a corrugated tube 10 made of the above-described highly conductive resin is provided, and a plurality of electric wires, in this embodiment, two general electric wires W1, are provided in the corrugated tube 10. Through W2, these wires W1 and W2 are provided with a shielding function. In addition, a corrugated clamp 11 also formed of a highly conductive resin is attached to the outer periphery of the corrugated tube 10, and the corrugated clamp 11 is locked in a locking hole 1 a formed in the vehicle body 1 in advance. Tube 1
The shield layer made of zero is grounded to the vehicle body.

As shown in FIG. 2, the corrugated tube 10 has a tubular shape in which valleys 11 and peaks 12 are alternately provided in the axial direction, and has a slit 13 along the axial direction. 13 is opened to cover the electric wires W1 and W2.

The corrugated clamp 20 is shown in FIG.
(A) As shown in (B), the configuration is the same as the conventional one except that it is formed of a highly conductive resin, and includes a pair of tube mounting portions 22 and 23 via a thin hinge 21.
As shown in FIG. 2 (B), a pair of ribs 22a, 22a fitted to the valleys 11 of the corrugated tube 10, respectively, are formed on the inner peripheral surfaces of the tube mounting portions 22, 23 formed of semicircular concave portions. , 23a, 23a protruding. A shaft portion 24 that is inserted into a mounting hole 1a formed in the vehicle body 1 protrudes from an outer peripheral surface of the one tube mounting portion 23, and a locking blade portion 25 is formed from an outer periphery of a distal end portion of the shaft portion 24. The locking blades 2 are projected in a folded shape, and the locking steps 2
5a is provided. In addition, these tube mounting portions 22,
A lock claw 26 and a claw locking portion 27 are provided at the tip of 23, and the lock claw 26 is inserted and locked into the claw locking portion 27 in a state of being fitted to the corrugated tube 10.

FIGS. 3A, 3B, 3C, 3D, and 3E are as follows.
2 shows a process of manufacturing a wire harness using the corrugated tube 10 and a process of connecting a ground to a vehicle body. First, as shown in FIG. 3 (A), terminals 6 are respectively applied to the conductors W1-c and W2-c, which are exposed by stripping the ends of the wires W1 and W2 using an automatic cutting and crimping machine (not shown). 3B, the terminal 6 is inserted and connected to the connector 7 as shown in FIG. 3 (B), and then the slit 13 of the corrugated tube 10 is opened to open the electric wires W1, W2 as shown in FIG. 3 (C).
As shown in FIG. 3 (D), a corrugated clamp 20 is attached to the outer periphery of the corrugated tube 10 and locked. At the time of wiring to the vehicle body, as shown in FIG. 3 (E), the locking blade portion 25 is inserted and locked into the mounting hole 1a of the vehicle body 1 and is connected to the ground.

As described above, since the corrugated tube 10, which is an exterior material, is formed of a highly conductive resin and has a shielding function, the general wires W1, W2 can be used without using a conventional shielded wire covered with a shield layer. Terminal 6
Can be shielded by crimping in advance and inserting and connecting the connector to the connector, and then fitting the corrugated tube 10 outside. Therefore, unlike the case where the shielded electric wire is used, the terminal is crimped by using the automatic cutting and crimping machine from the first step without stripping the outer coating such as the metal foil or the sheath and performing the work of returning the electric wire. Therefore, the number of steps and work load can be reduced, and workability can be greatly improved.

Further, since the corrugated clamp 20 attached to the outer periphery of the corrugated tube 10 is also formed of a highly conductive resin, the corrugated tube 10 forming the shield layer is locked by engaging the vehicle body via the corrugated clamp 20. Can be grounded to the vehicle body. Therefore, the conventionally required drain wire becomes unnecessary,
The number of parts can be reduced, cost can be reduced, and troublesome terminal crimping work can be reduced. In this respect, workability can be improved.

The present invention is not limited to the above embodiment, and the vehicle body locking structure of the corrugated clamp is
A tab-shaped locking plate protruding from the vehicle body may be inserted and locked in a locking hole provided in the corrugated clamp.

[0022]

As is apparent from the above description, according to the present invention, since a tube to be covered on the outer periphery of the electric wire is formed of a highly conductive resin as a sheathing material and has a shielding function, it is passed through the inside. The wires need not be shielded wires,
General electric wires can be used. Therefore, the work of stripping the outer covering such as the shielding metal foil and the insulating resin sheath, which is required when the shielded electric wire is used, becomes unnecessary, and the number of terminal crimping steps can be reduced. In addition, since the terminals are crimped to individual general wires, an automatic cutting and crimping machine can be used, unlike the case of multiple shielded wires, greatly reducing the burden of cumbersome terminal crimping work. Workability can be improved.

Further, the above-mentioned tube is used as a corrugated tube, and a corrugated clamp similarly formed of a highly conductive resin is attached to the outer periphery of the corrugated tube, and the vehicle body is locked through the corrugated clamp.
The vehicle body can be grounded. Therefore, the conventional drain wire becomes unnecessary, the number of parts can be reduced, and the operation of crimping the terminal to the drain wire becomes unnecessary, so that the cost can be reduced and the workability can be improved.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a first embodiment of the present invention.

2A is a perspective view showing a corrugated tube and a corrugated clamp, and FIG. 2B is a schematic cross-sectional view of a main part showing a state where the corrugated clamp is attached to the corrugated tube.

3 (A), (B), (C), (D), and (E) are work process diagrams showing steps of terminal crimping and ground connection.

FIG. 4 is a diagram showing a shielded electric wire of a conventional example.

FIGS. 5A and 5B are work process diagrams showing a conventional terminal crimping and ground connection process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 1a Locking hole 6 Terminal 10 Corrugated tube 20 Corrugated clamp 25 Locking wing W1, W2 Electric wire

Claims (2)

[Claims] A tube made of a highly conductive resin is provided,
An electric wire shielding structure, wherein a plurality of electric wires are passed through the tube to shield these electric wire groups. 2. A corrugated tube as the tube, a corrugated clamp formed of a highly conductive resin for locking the vehicle body, and the corrugated clamp is attached to the corrugated tube. The electric wire shield structure according to claim 1, wherein the electric wire shield structure is configured to be connected.