JP2008147476A - Shielding member, and wire harness having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire harness having a shielding member that has a good shield performance and can be easily worked on. <P>SOLUTION: The wire harness 1 has an electric wire 2, a drain wire 3, and a shielding member 4. The shielding member 4 has an insulating reinforcing layer 8, a conductive shield layer 9 laminated on one side of the reinforcing layer 8 such that it is side by side in a width direction of the reinforcing layer 8, and an insulating adhesive layer 7. Like vinegared rice rolled in dried laver, i.e., norimaki, this shielding member 4 is formed such that the shield layer 9 and the reinforcing layer 8 are wrapped, with the former located within and the latter without, around the periphery of an electric wire bundle grouping the electric wire 2 and the drain wire 3. Further, the shield member 4 is made such that the adhesive layer 7 is wrapped over the reinforcing layer 8. The end surface of the shield layer 9 is not exposed at the joined part of the shielding member 4 rolled into a cylinder like this. Thus, the shield layer 9 never gathers noise from the joined part of the shielding member 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shield member that is wound around the outer periphery of an electric wire to prevent noise from entering the electric wire, and a wire harness that is formed by winding the shield member around the outer periphery of the electric wire.

  In a car as a moving body, a wire harness is routed to supply electric power from a power source such as a battery to a mounted electronic device such as various lamps and various motors or to send a control signal from a control device. ing. The wire harness includes a plurality of electric wires and terminal fittings attached to the ends of the electric wires. As the wire harness described above, for example, there is one having a noise shield function shown in FIGS. 4 to 6 (see, for example, Patent Document 1).

  The wire harness 101 illustrated in FIG. 4 includes a plurality of covered electric wires 102, one drain wire 103, and a shield member 104. The covered electric wires 102 each have a conductive core wire 106 and a covering portion 105 that covers the core wire 106. The core wire 106 has a round cross section and includes copper or a copper alloy. The covering portion 105 is made of an insulating synthetic resin. The drain line 103 has a round cross section and is made of a conductive metal such as copper or a copper alloy.

  As shown in FIG. 5, the shield member 104 includes a thin shield layer 109, a reinforcing layer 108 laminated on one surface side of the shield layer 109, and an adhesive layer laminated on the other surface side of the shield layer 109. 107, and is formed in a thin sheet shape. The shield layer 109 is made of a conductive metal such as copper, a copper alloy, or aluminum. The reinforcing layer 108 is made of an insulating synthetic resin. The adhesive layer 107 is made of a synthetic resin and has adhesiveness.

  As shown in FIG. 6, the shield member 104 covers all the covered electric wires 102 and the drain wires 103 and is in contact with the drain wires 103. Further, the shield member 104 is configured such that the other end portion is overlapped with one end portion in the width direction and the reinforcing layer 108 at the one end portion and the adhesive layer 107 at the other end portion are in contact with each other, so that the covered electric wire 102 and the drain wire 103 are formed. And covering.

In the wire harness 101 described above, when noise from the outside tries to enter the core wire 106 of each covered electric wire 102, this noise is transmitted to the shield layer 109. The noise is released outside the wire harness 101 via the drain wire 103. Thus, the shield member 104 prevents external noise from entering the core wire 106 of each covered electric wire 102.
JP 2004-362858 A

  However, in the above-described conventional wire harness 101, as shown in FIG. 6, the edge portion E located at one end portion in the width direction of the shield layer 109 is exposed at the mating portion of the shield member 104 wound in a cylindrical shape. Therefore, there is a possibility that the edge E touches the noise and the shielding performance is deteriorated. For this reason, an insulation process such as tape winding has to be performed so as to cover the edge portion E from above the shield member 104, and there is a problem that the number of processing steps increases.

  Therefore, an object of the present invention is to provide a shield member that can be easily processed and obtains good shielding performance, and a wire harness that covers an electric wire with the shield member.

  In order to achieve the above object, the invention described in claim 1 is composed of a reinforcing layer made of an insulating synthetic resin and formed in a strip shape, and a conductive metal foil, and the width thereof is The shield layer is formed in a strip shape smaller than the width of the reinforcing layer, and the shield layer is laminated on one side of the reinforcing layer, and is arranged on the one side of the reinforcing layer along with the shield layer along the width direction of the reinforcing layer. And a laminated adhesive layer.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, an end in the width direction of the shield layer and an end in the width direction of the adhesive layer are in contact with each other. To do.

  Invention of Claim 3 is a wire harness which has an electric wire, a drain wire, and the shield member of Claim 1 or Claim 2, Comprising: The said shield member has the said shield layer inside. The wire harness is characterized by being wound around an outer periphery of the electric wire so that the adhesive layer located at one end portion in the width direction overlaps the reinforcing layer.

  According to the first aspect of the present invention, when the shield member is wound around the outer periphery of the object to be shielded in a laver shape, the end portions of the shield member are positioned so that the end portion on the side where the adhesive layer is provided is located outside. Since the shield layer is not exposed at the mating portion of the shield member wound in a cylindrical shape, the conventional insulation treatment of the exposed portion of the shield layer can be omitted. It is possible to provide a shield member that is easy and has good shielding performance. Moreover, since the tape etc. which were used for the said insulation process can be abbreviate | omitted, and the contact bonding layer is provided only in the one end part of the shield member, the material to be used can be made minimum necessary.

  According to the second aspect of the present invention, the width direction end of the shield layer and the width direction end of the adhesive layer are in contact with each other. Can be.

  According to the invention described in claim 3, when the shield member is wound around the outer periphery of the electric wire in a laver shape, the shield layer is disposed on the inner side and the adhesive layer located at one end in the width direction and the other in the width direction. By winding so that the reinforcing layer located at the end overlaps, the shield layer is not exposed at the mating portion of the shield member wound in a cylindrical shape, so insulation of the exposed portion of the shield layer that has been conventionally performed Processing can be omitted, and therefore, a wire harness having a shield member that can be easily processed and has good shielding performance can be provided. Moreover, since the tape etc. which were used for the said insulation process can be abbreviate | omitted, and the contact bonding layer is provided only in the one end part of the shield member, the material to be used can be made minimum necessary.

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

  As shown in FIGS. 1 and 2, the wire harness 1 includes an electric wire 2, a drain wire 3, and a shield member 4 wound around the outer periphery of the electric wire 2 and the drain wire 3.

  The electric wire 2 is formed in a round cross section having a core wire 6 and a covering portion 5 that covers the core wire 6. The core wire 6 is formed by twisting a plurality of conductive wires made of a conductive metal such as copper or copper alloy, and has a round cross section. That is, the core wire 6 is a stranded wire. Moreover, the coating | coated part 5 consists of a synthetic resin which has insulation, and coat | covers the core wire 6 keeping an insulation state. In the present embodiment, only one electric wire 2 is provided. However, in the present invention, a plurality of electric wires 2 may be provided.

  The drain line 3 has a round cross section and is made of a conductive metal such as copper or a copper alloy. Further, wiring terminal fittings (not shown) are attached to both ends of the drain wire 3 and the electric wire 2.

  As shown in FIGS. 2 and 3, the shield member 4 includes a reinforcing layer 8, a shield layer 9, and an adhesive layer 7. The reinforcing layer 8 is made of a synthetic resin having insulating properties such as polyvinyl chloride (PVC) and is formed in a strip shape. The shield layer 9 is made of a conductive metal foil containing aluminum, an aluminum alloy, or the like, and is formed in a strip shape. The reinforcing layer 8 is made of an insulating synthetic resin such as a hot-melt adhesive and is formed in a band shape. Further, the dimension in the width direction of the shield layer 9 is formed smaller than the dimension in the width direction of the reinforcing layer 8, and the dimension in the width direction of the adhesive layer 7 is formed smaller than the dimension in the width direction of the shield layer 9. ing. The dimension in the width direction of the reinforcing layer 8 is formed to be equal to the sum of the dimension in the width direction of the shield layer 9 and the dimension in the width direction of the adhesive layer 7.

  In the shield member 4, a shield layer 9 and an adhesive layer 7 are laminated on one side of a reinforcing layer 8, and the shield layer 9 and the adhesive layer 7 are arranged along the width direction of the reinforcing layer 8. . Further, the end portion in the width direction of the shield layer 9 and the end portion in the width direction of the adhesive layer 7 are in contact with each other. The end surface of the adhesive layer 7 away from the shield layer 9 is flush with the one end surface in the width direction of the reinforcing layer 8 and the end surface of the shield layer 9 away from the adhesive layer 7 is The reinforcing layer 8 is formed flush with the other end surface in the width direction.

  Such a shield member 4 is wound in a laver shape around the outer periphery of a bundle of electric wires 2 and a drain wire 3 with the shield layer 9 positioned on the inner side and the reinforcing layer 8 positioned on the outer side. The shield member 4 is wound so that the adhesive layer 7 overlaps the reinforcing layer 8. The adhesive layer 7 is bonded to the reinforcing layer 8 by being heated.

  Further, the end surface of the adhesive layer 7 is exposed at the mating portion of the shield member 4 wound in a cylindrical shape in this manner, and the end surface of the shield layer 9 is not exposed. For this reason, the shield layer 9 does not pick up noise from the mating portion of the shield member 4.

  In such a wire harness 1, the drain wire 3 and the shield layer 9 are in contact with each other, and the drain wire 3 in contact with the shield layer 9 is connected to a desired ground circuit or the like. Such a wire harness 1 allows noise that is about to enter the core wire 6 of the electric wire 2 to escape outside the ground circuit, that is, the wire harness 1 through the shield layer 9 and the drain wire 3 that is in contact with the shield layer 9.

  According to the present embodiment, when the shield member 4 is wound around the outer periphery of the electric wire 2 in a laver winding shape, the shield layer 9 is arranged on the inner side and the adhesive layer 7 located at one end in the width direction and the other end in the width direction Since the shield layer 9 is not exposed at the mating part of the shield member 4 wound in a cylindrical shape by being wound so as to overlap the reinforcing layer 8 positioned at the part, the exposed part of the shield layer that has been conventionally performed Therefore, it is possible to provide the wire harness 1 having the shield member 4 that can be easily processed and can obtain good shielding performance. Moreover, since the tape etc. which were used for the said insulation process can be abbreviate | omitted and the adhesive layer 7 is provided only in the one end part of the shield member 4, the material to be used can be made into the minimum required.

  Further, since the end in the width direction of the shield layer 9 and the end in the width direction of the adhesive layer 7 are in contact with each other, the dimension in the width direction of the shield member 4 can be minimized.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

It is a perspective view which shows the wire harness which has a shield function concerning one embodiment of this invention. It is sectional drawing which follows the AA line in FIG. It is a perspective view which shows the shield member which comprises the wire harness shown by FIG. 1, and is a figure which shows the state expand | deployed from the state of FIG. It is a perspective view which shows the wire harness which has the conventional shield function. It is sectional drawing for demonstrating the shield member of the wire harness shown by FIG. It is sectional drawing which follows the BB line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wire harness 2 Electric wire 3 Drain wire 4 Shield member 7 Adhesive layer 8 Reinforcement layer 9 Shield layer

Claims (3)

A reinforcing layer formed of an insulating synthetic resin and formed in a strip shape;
A shield layer formed of a conductive metal foil and having a width smaller than the width of the reinforcing layer and laminated on one side of the reinforcing layer;
An adhesive layer laminated on the one side of the reinforcing layer so as to be aligned with the shield layer along the width direction of the reinforcing layer;
The shield member characterized by having.   The shield member according to claim 1, wherein an end in the width direction of the shield layer and an end in the width direction of the adhesive layer are in contact with each other. A wire harness having an electric wire, a drain wire, and the shield member according to claim 1 or 2,
The wire harness, wherein the shield member is wound around an outer periphery of the electric wire so that the shield layer is arranged on the inner side and the adhesive layer located at one end in the width direction overlaps the reinforcing layer.

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