JP2012165562A - Electromagnetic shield pipe, structure of shield cable, and bending of the electromagnetic shield pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic shield pipe and a shield cable which make corrosion and dent or the like on a surface less likely to be caused and achieve both high shield performance and shape retention.SOLUTION: A shield cable 1 is composed mainly of an electromagnetic shield pipe 3, terminals 7, and an electric wire 9. The electric wire 9 is inserted into the electromagnetic shield pipe 3. The terminals 7 are connected with both end parts of the electric wire 9 that is a coated wire. In this invention, the electric wire 9 connected with the terminals 7 is referred to as the shield cable. The electromagnetic shield pipe 3 is composed of a resin inner layer 11, a metal layer 13, and a resin outer layer 15. In the electromagnetic shield pipe 3, the inner layer 11 and the outer layer 15 are respectively formed as an innermost layer and an outermost layer, and the metal layer 13 is formed between the inner layer 11 and the outer layer 15.

Description

  The present invention relates to an electromagnetic shield tube through which an electric wire is passed, a shield cable structure using the same, and a method for bending an electromagnetic shield tube.

  Conventionally, metal pipes such as steel pipes and aluminum pipes and resin corrugated pipes have been used as cable protection pipes. At this time, the influence of noise generated from the cable accommodated in the protective tube or the influence of external noise on the internal cable may be a problem. For example, in a hybrid vehicle, in order to protect a cable that supplies a three-phase AC output from an inverter device to a drive motor, a protective tube is piped in accordance with the shape of the vehicle body at the lower part of the vehicle body. At this time, since noise enters the radio or the like due to noise generated from the cable, it is necessary to take measures against shielding.

  As such a protective tube, there is a metal tube which is made of metal and has an outermost layer as a stainless steel layer and another layer made of iron for improving durability (Patent Document 1).

  Moreover, there exists a corrugated pipe | tube which formed the metal layer by plating in the resin-made corrugated pipe | tube (patent document 2).

JP 2007-81158 A JP 9-298382 A

  However, the metal tube as in Patent Document 1 has a problem of weight because it is made of metal. If the thickness of the metal tube is reduced as a countermeasure, the bent portion is crushed and flattened when bent, making it difficult to secure a predetermined inner diameter. Further, since a certain thickness is required, a large processing machine is required for bending. For this reason, it cannot necessarily be said that the workability to a product shape is good.

  Moreover, when a metal tube is subjected to an impact with a stone splash or the like on its outer surface, there is a risk that a recess will be easily formed. Moreover, when stainless steel is used like patent document 1, it will become expensive. Also, such a protective tube may not only cause water adhesion from the outside but also moisture inside due to condensation, etc. Even if a stainless steel layer is formed only on the outermost layer, it is completely a problem of corrosion. Is not resolved.

  Moreover, in the method of forming a metal layer on a resin corrugated tube as in Patent Document 2 by using an electroless plating method, there is a limit to the thickness of the metal layer that exhibits shielding properties, and high shielding characteristics, It is difficult to achieve both adhesion between the resin layer and the resin layer. In addition, since the resin corrugated tube is usually flexible, it is necessary to fix the predetermined portion while positioning the corrugated tube at a predetermined position of the vehicle and fixing the position to the vehicle. . For this reason, many fixing parts are required and the workability of laying and fixing the corrugated pipe to the vehicle is inferior.

  Further, since the metal layer is attached to the resin corrugated pipe by plating, there are problems such as peeling of the plating and corrosion of the plating.

  The present invention has been made in view of such problems, and is unlikely to cause corrosion, surface dents, and the like, and has an electromagnetic shield tube, a shield cable structure, and an electromagnetic shield tube having high shielding properties and shape retaining properties. An object of the present invention is to provide a bending method.

  In order to achieve the above-described object, the first invention is an electromagnetic shield tube through which an electric wire can be inserted. The resin inner layer, a metal layer formed on the outer periphery of the inner layer, and the metal layer A resin outer layer formed on an outer periphery, and the electromagnetic shield tube is a composite tube in which the inner layer, the metal layer, and the outer layer are integrally formed, and the electromagnetic shield tube After bending the shield tube, the rigidity after plastic deformation of the metal layer overcomes the restoring force accompanying the elastic deformation of the inner layer and the outer layer, thereby having a shape retaining property capable of maintaining a bent shape. It is an electromagnetic shielding tube characterized by.

  The metal layer may be formed by overlapping both ends of a metal belt-shaped member at a lap portion, and the opposing surfaces of the both ends of the belt-shaped member are not directly joined to each other in the wrap portion, and are cylindrical. Although it may be formed in a shape, it may be formed by joining a part of the wrap portion.

  It is desirable that at least one of the inner layer and the outer layer is thicker than the metal layer. It is desirable that the outer layer is thicker than the inner layer, or the outer layer and the inner layer have the same thickness. The metal layer is preferably made of aluminum.

  The outer layer contains an additive that improves at least one of flame retardancy and weather resistance, and a pigment intended for coloring may be added to the outer layer as necessary.

  According to 1st invention, since a metal layer is formed in an inside, a shielding property can be exhibited with respect to the electric wire penetrated inside. Moreover, since the inner and outer layers are made of resin and the metal layer is formed as an intermediate layer, the metal layer is not exposed on the inner and outer surfaces of the electromagnetic shield tube, and the electromagnetic shield tube is not corroded.

  Further, since the resin layer has a heat insulating property, it is difficult for condensation to occur in the pipe, and there is no problem such as dielectric breakdown of the internal electric wire due to the condensed water.

  Further, the metal layer may have a minimum thickness for ensuring shielding properties and shape retention, and is easy to bend as compared with the case where the whole is a metal layer, and is used for bending a metal tube. Without using such a large hydraulic bender or the like, bending can be performed with a simple device such as manual machining or a small manual bender.

  Also, rather than forming a metal layer by plating or the like on a resin like a conventional corrugated tube, the shape is maintained as a whole (when the composite tube is bent, the bent shape is maintained and the tube is plastically deformed. Therefore, the shape can be processed in advance in accordance with a fixed layout to the vehicle. Therefore, the laying workability of the electromagnetic shield tube is excellent.

  In particular, since the resin layer is provided on the inner and outer layers of the metal layer, the metal layer is not crushed and flattened at the bent portion. Moreover, since it consists of substantially resin as a whole, weight reduction can be achieved compared with what comprises the whole with a metal. In particular, by reducing the thickness of the metal layer and increasing the thickness of the inner layer or the outer layer, the effects as described above can be obtained more reliably.

  In addition, even if stones or the like collide with the outer periphery, the metal layer is not dented by the elastic resin outer layer.

  In addition, such a metal layer is easy to manufacture by forming a metal strip member in a circular shape. Further, the end portions of the belt-shaped members are brought into contact with each other or contacted, or a wrap portion is formed and at least a part of the wrap portion is brought into contact with each other, so that no noise leaks. In addition, since the metal layer is made of a metal thin strip member, it is excellent in bendability during bending. That is, the above-described flattening during bending can be prevented.

In addition, by adding an additive for enhancing flame retardancy, weather resistance, etc., only to the resin of the outer layer, the effect can be achieved with the minimum necessary amount compared to the case of adding to the entire pipe. Obtainable. Similarly, it is possible to distinguish whether the shield layer is for high pressure or low pressure by adding a pigment such as yellow or orange to only the resin of the outer layer.
Furthermore, the wrap portion of the metal layer of the outer resin layer can be colored for marking at the center of the wrap portion or the wrap portion of the metal layer of the outer layer resin during or after coloring. Here, when bending is performed so that the wrap portion (circumferential position of the wrap portion) is included in the bending surface (the plane formed by the processed portion of the bent shield tube), the metal layer eventually becomes two layers. Since the overlapped lap portion is bent as the outer periphery or inner periphery, the rigidity of the metal layer after bending can be increased. Therefore, when bending is performed, at least such a bent portion should be included. It is desirable to bend it.

  2nd invention uses the electromagnetic shielding pipe | tube concerning 1st invention, an electric wire is penetrated in the inside of the said electromagnetic shielding pipe, and the terminal part connected with the said electric wire is provided in the both ends of the said electromagnetic shielding pipe | tube. This is a shielded cable structure characterized by the following. A resin corrugated tube may be placed on the outer periphery of the electromagnetic shield tube.

According to the second invention, since the electromagnetic shield tube has shape retention, the shield cable can be easily laid.
The third invention is as follows. When bending an electromagnetic shield tube according to the invention described above, the bending method of the electromagnetic shield tube is characterized in that the bending is performed so that the lap portion of the metal layer is included in the bending surface.

  According to the present invention, it is possible to provide an electromagnetic shield tube, a shield cable structure, and a bending method for an electromagnetic shield tube that are unlikely to cause corrosion or surface dents and that have high shielding properties and shape retention.

The figure which shows the shielded cable 1. FIG. It is a figure which shows the electromagnetic shielding pipe | tube 3, (a) is a perspective view, (b) is sectional drawing. The figure which shows other embodiment of the shield pipe. The figure which shows the laying state of a shielded cable. The figure which shows the other laying state of a shielded cable. The figure which shows the example of the shielded cable in which the outer tube | pipe 21 was provided. (A) is a figure which shows the electromagnetic shielding pipe 3a, (b) is a figure which shows the electromagnetic shielding pipe 3b.

  Hereinafter, a shielded cable 1 according to an embodiment of the present invention will be described. FIG. 1 is a diagram showing a shielded cable 1. The shielded cable 1 is mainly composed of an electromagnetic shield tube 3, a terminal 7, an electric wire 9, and the like.

  An electric wire 9 is inserted into the electromagnetic shield tube 3. Terminals 7 are connected to both ends of the wire 9 that is a covered wire. In the present invention, a structure in which the terminal 7 is connected to the electric wire 9 is referred to as a shielded cable structure.

  2A and 2B are views showing the electromagnetic shield tube 3, in which FIG. 2A is a perspective view and FIG. 2B is a cross-sectional view. The electromagnetic shield tube 3 includes a resin inner layer 11, a metal metal layer 13, and a resin outer layer 15. The electromagnetic shield tube 3 is configured by forming an inner layer 11 as an innermost layer, an outer layer 15 as an outermost layer, and a metal layer 13 between the inner layer 11 and the outer layer 15.

  The resins constituting the inner layer 11 and the outer layer 15 may be the same resin or different resins. For example, it can be selected from polyolefin resins such as polypropylene and polyethylene, and thermoplastic resins such as polyamide and polybutylene terephthalate. The resin may be crosslinked or modified. For example, it may be cross-linked to improve heat resistance, or may be modified with maleic acid to improve adhesiveness. In addition, flame retardants such as halogen-based, phosphorus-based and metal hydrates may be added, and titanium oxide or the like may be added to improve weather resistance.

  Such a flame retardant and an additive for improving weather resistance may be added only to the resin constituting the outer layer 15. That is, it may not be added to the resin of the inner layer 11 that does not require flame retardancy and weather resistance.

  In addition, a pigment for the purpose of coloring may be added to the resin constituting the outer layer 15. Usually, when used as a high-voltage cable for automobiles or the like, it is necessary to distinguish from other general protective tubes and the like from the viewpoint of safety. For example, it is necessary to color only the protective tube of such a high voltage line. However, since there is a plating layer outside the cable protection tube, such coloring is difficult. For example, if the surface of a conventional protective tube is simply painted, the coating may be peeled off.

  In contrast, in the present invention, since the outermost layer is made of resin, the resin itself can be colored. Therefore, by coloring only the outer layer 15, it is excellent in appearance and can be distinguished from surrounding piping. Even in this case, the resin of the inner layer 11 need not be colored.

  The metal layer 13 may be made of copper or iron as long as the shielding effect can be obtained, but it is desirable to use aluminum (including an aluminum alloy) in consideration of weight reduction and cost.

  At least one of the inner layer 11 and the outer layer 15 is formed thicker than the metal layer 13. For example, as illustrated, both the inner layer 11 and the outer layer 15 can be made thicker than the metal layer 13. By doing so, it is possible to prevent the shield tube 3 from being flattened particularly during bending. That is, by making the inner layer 11 sufficiently thick, the metal layer 13 can be prevented from being flattened inward, and by making the outer layer 15 sufficiently thick, the metal layer 13 can be prevented from being flattened. Can do. For example, when the metal layer 13 is bent, the outer periphery of the bent portion of the metal layer is crushed, the diameter that matches the bending surface direction of the metal layer decreases, and the diameter in the direction orthogonal to the bending surface direction increases. Even if the outer layer 15 is to be flattened, the outer layer 15 can impart an action to return to the circular shape before bending to the metal layer 13, thereby preventing the metal layer 13 from being flattened.

  In addition, the thickness of the metal layer 13 can obtain necessary shield characteristics, and when the electromagnetic shield tube 3 formed with the inner layer 11 and the outer layer 15 is bent, the rigidity of the metal layer 13 in the bent state is The inner layer 11 and the outer layer 15 are set to be larger than the restoring force for returning to the original state. That is, when the electromagnetic shield tube 3 is bent, the inner metal layer 13 is plastically deformed, and the inner layer 11 and the outer layer 15 are elastically deformed by their own flexibility. On the other hand, if the rigidity of the metal layer 13 in the bent state is larger than the restoring force accompanying the elastic deformation of the inner layer 11 and the outer layer 15, the flexible tube 3 retains the shape in the bent state. Can do.

  Next, a method for manufacturing the electromagnetic shield tube 3 will be described. First, a resin tube that becomes the inner layer 11 is manufactured by extrusion or the like. Next, a thin metal plate (including a metal sheet) that is a band-shaped member constituting the metal layer 13 is formed into a tubular shape on the outer periphery of the resin tube of the inner layer 11 so as to partially wrap while forming. Thus, the metal layer 13 is formed on the outer periphery of the resin tube of the inner layer 11. Furthermore, the outer layer resin is extrusion coated on the outer periphery of the metal layer 13 to complete the electromagnetic shield tube 3.

  By manufacturing in this way, a wrap portion 17 is formed on a part of the metal layer 13 as shown in FIG. In addition, since the wrap part 17 is pressed from the outside when the outer layer 15 is covered, the ends of the metal thin plates of the wrap part are in contact with each other. Therefore, in the cross section shown in the figure, no gap is formed in the metal layer 13 forming the shield layer.

  Note that at the wrap portion 17, at least a part of the wrap portion 17 may be joined by butt welding, ultrasonic welding, or the like before covering with the outer layer 15. It can also be in the state. Alternatively, a part of the wrap portion 17 may be brought into direct contact and the other part may be bonded with an adhesive. In any method, it is desirable that the metal layer 13 is continuous (conductive) in the circumferential direction. By doing in this way, shield property can be ensured reliably.

  Further, butt welding may be performed as shown in FIG. 3 without forming the wrap portion 17. In this case, the metal thin plate is formed into a cylindrical shape, the ends of the metal thin plate (butting portion 18) are butted together, and the butting portion 18 may be joined by welding. Even in this case, since the metal layer 13 is continuous in the circumferential direction, the shielding property can be ensured reliably. In order to ensure electromagnetic shielding, it is desirable that the end of the metal strip is joined or in contact at any position in the circumferential direction. Are not necessarily in contact.

  If the end portions of the thin metal plates are only in contact with each other without joining the wrap portion 17, the ends of the wrap portion 17 are slid on the contact surfaces at the time of bending of the electromagnetic shield tube 3. Can move. That is, the wrap portion 17 can be slightly opened or closed in the circumferential direction along with the bending deformation, so that the deformation can be absorbed and flattening of the metal layer 13 can be prevented. The wrap length of the wrap portion 17 may be set within a range in which the wrap portion 17 is opened and no gap is generated in the metal layer 13 by bending at the maximum bending portion (minimum bending radius portion) of the electromagnetic shield tube 3.

  As such an electromagnetic shield tube, for example, an inner diameter of 20 mm, an inner layer 11 having a thickness of 0.5 mm, a metal layer 13 having a thickness of 0.5 mm, an outer layer 15 having a thickness of 1 mm, and an outer diameter of 24 mm may be used. it can. Such an electromagnetic shield tube 3 in which the inner layer 11 and the outer layer 15 are made of polypropylene and the metal layer 13 is made of aluminum can be easily bent by a manual vendor.

  Further, an adhesive layer or the like may be provided between the inner layer 11 and the metal layer 13 or between the metal layer 13 and the outer layer 15. Here, in the present invention, the metal layer formed on the outer periphery of the inner layer is not necessarily limited to the direct contact between the inner layer 11 and the metal layer 13, and another layer is provided between the inner layer 11 and the metal layer 13. The case where is formed is also included.

  Similarly, the resin outer layer formed on the outer periphery of the metal layer is not limited to the direct contact between the metal layer 13 and the outer layer 15, and another layer is provided between the metal layer 13 and the outer layer 15. The case where it is formed is also included.

  Moreover, the inner layer, the metal layer, and the outer layer are integrally formed means that not only the inner layer 11, the metal layer 13, and the outer layer 15 are in direct contact with each other, but also the inner layer 11 and the metal layer. Even when another layer is formed between the metal layer 13 and the metal layer 13 and the outer layer 15, it is included that the respective layers are integrated. For example, it includes what is integrated as a whole as in the case where an adhesive layer is provided between the inner layer 11 and the metal layer 13 or between the metal layer 13 and the outer layer 15.

  Next, a shielded cable laying structure using the shielded cable 1 of the present invention will be described. 4A is a view showing a shielded cable laying structure, and FIG. 4B is a cross-sectional view of the shielded cable 1. In addition, the form of the shielded cable to be laid is not limited to the illustrated example.

  The shielded cable 1 is laid in a predetermined layout, for example, at the lower part of an automobile, and is fixed to a vehicle body or the like at predetermined intervals. At this time, a predetermined portion of the shielded cable 1 is bent in advance with a predetermined curvature and partially fixed to the vehicle by the fixing member 19. In addition, such a bent part is not necessarily limited to the bending form as illustrated, and a bending angle and a bending radius are appropriately set according to the layout.

  For example, a high-voltage electric wire 9 is inserted into the shielded cable 1. In the illustrated example, an example in which two electric wires 9 are inserted is shown, but the present invention is not limited to this.

  As a shielded cable laying structure, for example, two 8 mm-diameter wires 9 are inserted into the above-described shielded cable (inner diameter 20 mm), one end (terminal) is connected to an inverter (not shown), and the other end The part (terminal) is connected to a motor (not shown) or the like. The metal layer 13 is electrically connected to a conductive shield case (not shown) in which the inverter is accommodated.

  Here, as a bending direction of the shield cable (electromagnetic shield tube), it is desirable that the wrap portion 17 is in contact with the bent surface. Here, it is desirable that the contact with the bent surface bend so that the lap portion is positioned on the outer peripheral portion or the inner peripheral portion of the bent portion of the electromagnetic shield tube when bent. By doing in this way, when an electromagnetic shielding pipe is bent, the rigidity of a bending part can be made high. For this reason, the shape maintenance property of a shield cable (electromagnetic shield tube) can be improved more.

  As mentioned above, according to this Embodiment, since the metal layer 13 is provided in an intermediate | middle layer, it has shielding properties. In addition, since the inner layer 11, the metal layer 13, and the outer layer 15 are integrally formed, their axial positions are not displaced and the inner metal layer does not fall off.

  Moreover, since the rigidity of the metal layer 13 is larger than the restoring force accompanying the elastic deformation of the inner layer 11 and the outer layer 15 which are other layers, the shape bent at the time of bending can be maintained. At this time, since the metal layer 13 is thinner than a conventional metal tube, processing is easy. Therefore, by bending in advance according to the laying shape of the shielded cable, the laying work of the shielded cable (electromagnetic shield tube) is excellent, and the number of fixing members 19 used in the vehicle is reduced compared with the flexible tube. can do.

  In addition, since the inner layer 11 and the outer layer 15 are made of resin, the electromagnetic shield tube 3 is not corroded due to adhesion of water from the outside, intrusion of water into the inside, condensation, or the like. Moreover, since the inner layer 11 and the outer layer 15 have a heat insulation effect, internal condensation can be prevented.

  Further, by making the inner layer 11 and the outer layer 15 thicker than the metal layer 13, it is possible to prevent the metal layer 13 from being flattened (buckled) at the bent portion when the electromagnetic shield tube 3 is bent. .

  Moreover, since the metal layer 13 is comprised from a strip | belt-shaped member, manufacture of the electromagnetic shielding pipe | tube 3 is easy. In addition, while the wrap part is formed and the end parts of the belt-shaped member are in contact with each other at the wrap part, it is possible to ensure the shielding property and to be slidable without joining the contact surface. The flattening of the metal layer 15 can be suppressed.

  Further, for example, by adding an additive for the purpose of improving the flame resistance or weather resistance only to the outer layer, the characteristics of the electromagnetic shield tube 3 can be improved. Further, only the outer layer can be colored. At this time, the inner layer 11 does not require weather resistance and flame retardancy, and therefore no additive is required. Therefore, the amount of additive used can be reduced as compared with a resin tube or the like that is integrally formed as a whole.

  Next, another embodiment will be described. FIG. 5 is a diagram illustrating another laying structure of the shielded cable 1. In the following description, components having the same functions as those shown in FIGS. 1 to 4 are given the same reference numerals as in FIGS.

  The shielded cable laying structure shown in FIG. 5 is substantially the same as the shielded cable laying structure shown in FIG. 4, but differs in that an outer tube 21 is provided on the outer periphery of the shielded cable 1. The outer tube 21 is, for example, a resin corrugated tube. The outer tube 21 is used to protect the shielded cable 1 from the outside.

  FIG. 6 is a view showing a cross section of the shielded cable 1 provided with the outer tube 21. For example, as illustrated in FIG. 6A, an electric wire 9 a may be provided between the outer tube 21 and the shield cable 1. The electric wire 9a is a low-voltage electric wire, for example, and is a covered electric wire through which a weak current flows, such as a low-voltage power system or a signal cable.

  By doing in this way, the electric wire 9 (shield cable 1) which is a high voltage electric wire and the electric wire 9a which is a low voltage electric wire can be laid in a lump. Since the electric wire 9 is inserted into the electromagnetic shield tube 3, noise from the electric wire 9 is shielded. Therefore, the electric wire 9 a inserted through the gap between the electromagnetic shield tube 3 and the outer tube 21 is not affected by noise from the electric wire 9.

  Moreover, as shown in FIG.6 (b), the shielded cable 1 can also be made into a rectangle. Although not shown, the outer tube 21 may be substantially rectangular. That is, the electric wire 9a can be efficiently arranged inside by making at least one of the outer tube 21 and the electromagnetic shield tube 3 into a substantially rectangular shape. Further, by adopting a rectangular shape, installation is easy even in a narrow space under the automobile, and space saving can be achieved. In addition, although only one electric wire 9a inside the outer tube 21 is arranged, a plurality of electric wires can be arranged.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, the thicknesses of the inner layer 11 and the outer layer 15 can be appropriately set according to necessary characteristics. FIG. 7A is a view showing the electromagnetic shield tube 3a in which the inner layer 11 is made thinner and the outer layer 15 is made thicker. According to the electromagnetic shield tube 3a, it has extremely high damage resistance. That is, even when a stone or the like collides from the outside, the outer layer 15 is sufficiently thick, so that the metal layer 13 is not damaged. Further, it is possible to prevent the cross section from being flattened when the electromagnetic shield tube 3a is bent.

  Moreover, since the electromagnetic shield tube 3 has a long distance from the outer periphery to the metal layer 13, even when water penetrates into the resin from the outside, corrosion of the metal layer 13 can be further prevented. If the inner layer 11 does not affect the shape retainability and the like, the metal layer 13 is not exposed even if the inner layer 11 is thinned, so that an effect on corrosion resistance and the like can be obtained.

  Further, as shown in FIG. 7B, an electromagnetic shield tube 3b in which the inner layer 11 is thickened and the outer layer 15 is thinned may be used. According to the electromagnetic shield tube 3b, it is possible to more reliably prevent the metal layer 13 from being flattened by bending the outer peripheral surface of the bent portion closer to the inner peripheral surface. Therefore, the inner diameter at the bent portion is not reduced. Therefore, the inner diameter is not reduced even at the bent portion, and the wire insertion workability is excellent.

  Further, since the electromagnetic shield tube 3b has a thin outer layer 15, as described above, even when an additive or a pigment is added only to the outer layer, the amount of resin constituting the outer layer can be reduced. The amount of additives and pigments used can be reduced. If the outer layer 15 does not affect the shape retention and the damage resistance, the metal layer 13 is not exposed even if the outer layer 15 is thinned, so that an effect on the corrosion resistance and the like can be obtained.

1, 1a ......... Shielded cables 3, 3a, 3b ......... Electromagnetic shield tube 7 ......... Terminals 9, 9a ...... Wire 11 ......... Inner layer 13 ......... Metal layer 15 ......... Outer layer 17 ... ... Lap part 19 ......... Fixing member 21 ......... Outer tube

Claims (11)

An electromagnetic shield tube through which an electric wire can be inserted,
A resin inner layer,
A metal layer formed on the outer periphery of the inner layer;
A resin outer layer formed on the outer periphery of the metal layer;
Comprising
The electromagnetic shield tube is a composite tube in which the inner layer, the metal layer, and the outer layer are integrally formed,
The electromagnetic shield tube may maintain a bent shape by bending the electromagnetic shield tube and then the rigidity after plastic deformation of the metal layer overcomes the restoring force accompanying the elastic deformation of the inner layer and the outer layer. An electromagnetic shield tube characterized by having a possible shape retention.   The electromagnetic shield tube according to claim 1, wherein the metal layer is formed by overlapping both ends of a metal belt-shaped member at a lap portion.   3. The electromagnetic shield tube according to claim 2, wherein opposed surfaces of both end portions of the belt-shaped member are not directly joined to each other but are formed in a cylindrical shape in the wrap portion. The thickness of at least one of the inner layer and the outer layer is
The electromagnetic shield tube according to any one of claims 1 to 3, wherein the electromagnetic shield tube is thicker than the metal layer.   The electromagnetic shield tube according to any one of claims 1 to 4, wherein the outer layer is thicker than the inner layer, or the outer layer and the inner layer have the same thickness.   The electromagnetic shield tube according to claim 1, wherein the metal layer is made of aluminum.   The outer layer contains an additive that improves at least one of flame retardancy and weather resistance, and a pigment for coloring is added to the outer layer as needed. The electromagnetic shield pipe according to claim 6.   7. The mark according to any one of claims 2 to 6, wherein a mark continuous in the tube axis direction is provided at a position corresponding to the wrap portion or the center of the wrap portion of the metal layer of the outer layer of the electromagnetic shield tube colored with a pigment. The electromagnetic shielding tube according to Crab.   The electromagnetic shield tube according to any one of claims 1 to 8, wherein an electric wire is inserted into the electromagnetic shield tube, and terminal portions connected to the electric wire are provided at both ends of the electromagnetic shield tube. A shielded cable structure characterized by that.   10. The shield cable structure according to claim 9, wherein a corrugated pipe made of resin is placed on an outer periphery of the electromagnetic shield pipe.   Bending of an electromagnetic shield tube according to any one of claims 1 to 8, wherein when bending the electromagnetic shield tube, bending is performed so as to include the lap portion of the metal layer in the bending surface. Processing method.

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