JP6815820B2 - Manufacturing method of electromagnetic shield tube, electric wire with electromagnetic shield tube, and electric wire with electromagnetic shield tube - Google Patents

Description

The present invention relates to, for example, an electromagnetic shield tube through which an electric wire is inserted, an electric wire with an electromagnetic shield tube through which an electric wire is inserted through the electromagnetic shield tube, and a method for manufacturing an electric wire with an electromagnetic shield tube.

For example, electric wires connecting devices such as inverter devices and motors in hybrid vehicles and electric vehicles may be laid under the floor of the vehicle body according to the shape of the vehicle body, and it is necessary to prevent damage due to flying stones and the like. is there. It is also necessary to prevent the mounted electronic devices from malfunctioning due to noise by blocking the radiation of noise generated from the electric wire and the intrusion of noise from the outside.

Therefore, for example, Patent Document 1 proposes an electromagnetically shielded tube made of a metal tube through which an electric wire can be inserted. By grounding the metal tube, noise from the electric wire inserted inside can be generated to the outside. It is said that it can prevent radiation and noise from the outside to the inside. Further, it is said that it is possible to prevent the electric wire passing through the inside of the electromagnetic shield tube made of a strong metal tube from being damaged by flying stones or the like.

However, since this electromagnetic shield tube is made of metal, there is a problem that it tends to be heavy. It is thought that weight reduction can be achieved by reducing the wall thickness of the metal pipe to deal with such problems. However, if the metal pipe with a thin wall thickness is bent according to the shape of the vehicle body, the bent pipe portion is bent. The wire may be crushed and the cross section may be flattened or damaged, resulting in damage or exposure of the electric wire inserted inside the electromagnetic shield tube.

Japanese Unexamined Patent Publication No. 2004-171952

In view of the above-mentioned problems, the present invention has an electromagnetic shield tube, an electric wire with an electromagnetic shield tube, and an electric wire with an electromagnetic shield tube, which can be made lighter and can protect the electric wire inserted inside even if bent. It is an object of the present invention to provide the manufacturing method of.

In the present invention, a tubular metal pipe through which an electric wire is inserted, a resin inner layer formed on the inner circumference of the metal pipe, an inner peripheral surface of the metal pipe, and an outer peripheral surface of the inner layer. The adhesive layer is provided with an adhesive layer for adhering and integrating the metal tubes, and the outer diameter of the metal tube is 25 times or more and 100 times or less the wall thickness of the metal tube, and the adhesive layer is similar to the thermoplastic inner layer body. The adhesive layer composed of the above composition material and melted under pressure has an anchor effect, and the adhesive strength between the inner peripheral surface of the metal pipe and the outer peripheral surface of the inner layer by the adhesive layer is 3 MPa or more. It is characterized by being a shielded tube.

The metal tube shall include, for example, a metal tube such as an aluminum tube or a copper tube, a metal tube formed of a metal mesh plate, and a metal tube combining these. Further, it includes a metal tube in which ends are butted to form a tubular shape, a metal tube in which ends are overlapped to form a tubular shape, or a seamless metal tube.

The term "resin" means that the resin is formed of a resin having the required performance required as the inner layer for protecting the electric wire such as desired wear resistance, and specifically, it is made of a synthetic resin such as polyethylene. As expected.

The adhesive strength between the inner peripheral surface of the metal tube and the outer peripheral surface of the inner layer body by the above-mentioned adhesive layer is the adhesive strength of the entire inner peripheral surface of the metal tube and the outer peripheral surface of the inner layer body, or total adhesion. It shall include the value obtained by dividing the strength by the inner circumference of the metal pipe, or the adhesive strength per unit area.

The above-mentioned similar composition material refers to a material in which the main component is composed of the same composition. For example, the composition component of the resin constituting the inner layer is a polyethylene-based resin, and the composition component of the adhesive layer. Includes the case where is a polyethylene-based hot melt adhesive.

According to the present invention, the weight of the electromagnetically shielded tube can be reduced, and the electric wire that is inserted inside can be protected even if it is bent.
More specifically, when the outer diameter of the metal pipe is less than 25 times the wall thickness of the metal pipe, that is, when the wall thickness is larger than 1/25 with respect to the metal pipe having a predetermined outer diameter, the outer diameter On the other hand, since the wall thickness becomes thicker, it is not possible to sufficiently reduce the weight.

On the other hand, when the outer diameter of the metal pipe is larger than 100 times the wall thickness of the metal pipe, that is, when the wall thickness is less than 1/100 of the metal pipe having a predetermined outer diameter, the outer diameter is adjusted. On the other hand, the wall thickness becomes too thin. Therefore, the metal tube may be damaged and cracked, and the shielding performance for blocking noise may be deteriorated.

Further, when the metal pipe is bent, the cross section of the electromagnetic shield pipe may be flattened or damaged due to the bending load. In this case, the electric wire passing through the inside may be compressed and damaged. There is also.

On the other hand, by setting the outer diameter of the metal tube to 25 times or more and 100 times or less the wall thickness of the metal tube, the wall thickness of the metal tube can be reduced to reduce the weight of the electromagnetic shield tube and the shield. Sex can be ensured.

Further, since the adhesive strength of the adhesive layer for adhering the inner layer body and the metal tube is 3 MPa or more, even when the electromagnetic shield tube is bent, the inner layer adhered to the metal tube. It is possible to prevent the body from peeling off from the inner peripheral surface of the metal tube, and the inner layer body can internally support the metal tube on which a bending load acts. As a result, it is possible to prevent the metal pipe in the curved pipe portion from being crushed and the cross section being flattened or damaged. Therefore, it is possible to reliably protect the electric wire passing through the inside, and it is possible to prevent the radiation of noise generated from the electric wire and the intrusion of noise from the outside.

Further, since the adhesive layer is composed of a composition material similar to that of the thermoplastic inner layer body, the inner layer body can be reliably adhered by the metal tube, and a desired thickness as the inner layer body can be secured. Therefore, the electric wire can be protected more reliably and can be internally supported.

In detail, a more reliable adhesive for the inner layer material and said adhesive layer is composed of cognate forming member, said inner member by dissolving by heating the adhesive layer to the metal tube The metal pipe in the curved pipe portion can be more reliably internally supported by the inner layer body.

Further, since the inner layer body having a desired thickness is adhered to the metal tube by an adhesive layer whose layer thickness is difficult to be constant, a resin layer equal to or more than the thickness of the inner layer body is surely formed on the inner surface of the metal tube. can do. Therefore, the electric wire can be protected more reliably, and the inner layer body can more reliably support the inner peripheral surface of the metal pipe in the metal pipe in the curved pipe portion, so that the metal pipe in the curved pipe portion can be supported. It is possible to more reliably prevent the cross section from being crushed and flattened or damaged.

Further, as compared with the case where an adhesive layer having high thermal conductivity is used inside the metal tube, the inner layer body arranged via the adhesive layer is not melted by heating, so that the inner layer body is inside the inner layer body. Since the peripheral surface does not become uneven, that is, a smooth inner peripheral surface is formed, the electric wire can be inserted inside without being caught by the inner peripheral surface, and work efficiency can be improved.

As an aspect of the present invention, the wall thickness of the inner layer body may be 1.5 times or more the wall thickness of the metal tube.
According to the present invention, since the inner layer body has a sufficient thickness with respect to the metal tube, the electric wire can be sufficiently protected, and the metal tube and the inner layer body are integrated, so that the appearance is apparent. An electromagnetic shield tube having high cross-sectional rigidity can be configured.

Further, when a bent pipe portion that has been bent is formed in the metal pipe, the inner layer body internally supports the metal pipe on which a bending load acts due to the bending process from the inner surface side, so that the curved pipe portion is formed. It is possible to reliably prevent the metal tube from being crushed and the cross section being flattened or damaged.

Further, as an aspect of the present invention, the thickness of the adhesive layer may be 0.05 mm or more and 0.50 mm or less.
According to the present invention, the inner layer body can be reliably and firmly adhered to the metal pipe, and flattening or damage to the cross section of the metal pipe can be prevented.

More specifically, when the thickness of the adhesive layer is less than 0.05 mm, the adhesive layer is thin and melts by heating to form spots on the adhesive layer, which are not adhered to the adhesive portion between the inner layer body and the metal tube. Part may occur. Further, since the thickness of the adhesive layer is thin, the connecting layer side of the inner layer may be melted by heating in the bonding step of adhering the metal tube and the inner layer, and the predetermined thickness required for the inner layer may not be maintained. There is.

On the contrary, when the thickness of the adhesive layer is made larger than 0.50 mm, a portion where the adhesive layer cannot be melted by heating is formed, and the adhesion between the metal tube and the inner layer body is uneven, and the curved tube portion is described. In the metal tube, the inner layer body may be easily peeled off, and the inner layer body may not be able to internally support the flattening of the cross section of the curved tube portion.

On the other hand, by configuring the thickness of the adhesive layer to be 0.05 mm or more and 0.50 mm or less, the adhesive layer can be reliably melted, and the metal pipe and the inner layer body can be reliably connected via the adhesive layer. And it can be firmly adhered. Therefore, the inner layer body does not peel off from the metal layer in the curved tube portion, the electric wire can be protected more reliably, and the metal tube is reliably internally supported against deformation in which the cross section is flattened by bending. can do.

Further, as an aspect of the present invention, the inner diameter of the inner layer body may be 1.1 times or more the outer diameter of the electric wire to be inserted into the metal tube.
The outer diameter of the electric wire may be the outer diameter of one electric wire or the apparent outer diameter of a wire harness or the like in which a plurality of electric wires are collectively configured.

According to the present invention, the electric wire can be inserted through the metal pipe in the curved pipe portion without contacting the inner layer body, and even when the metal pipe has a flat cross section, the inserted electric wire is prevented from being damaged. it can.

More specifically, by adhering the inner layer body and the metal pipe, it is possible to prevent or suppress flattening of the cross section of the metal pipe in the curved pipe portion, but depending on the degree of bending of the metal pipe, the inner layer The body will be partially biased inward. If the inner diameter of the inner layer is less than 1.1 times the outer diameter of the electric wire to be inserted into the metal pipe, the inner layer presses the electric wire through which the metal pipe is inserted at the curved pipe portion, and the electric wire is pressed. There is a risk of damaging the wires.

On the other hand, by configuring the inner diameter of the inner layer body to be 1.1 times or more the outer diameter of the electric wire to be inserted into the metal tube, even if the metal tube is bent, the inside of the inner layer body is formed. Since a penetrating space having a desired size is formed, the electric wire can be inserted without abutting with the inner layer body biased inward, and the electric wire can be prevented from being damaged in the curved pipe portion.
Further, even if the cross section of the metal pipe is slightly flattened by the bending process, it is possible to prevent the inserted electric wire from being pressed against the inner surface of the metal pipe and being damaged.

The present invention is also characterized in that it is an electric wire with an electromagnetic shield tube composed of the above-mentioned electromagnetically shielded tube and an electric wire inserted through the metal tube.
Furthermore, the present invention relates to an electromagnetic shield tube composed of a tubular metal tube, a resin inner layer body bonded to the inner circumference of the metal tube, and an adhesive layer adhering the metal tube and the inner layer body. The bonding step of adhering and integrating the inner layer body with the metal tube and the insertion step of inserting an electric wire into the inside of the metal tube are performed in this order, and the adhesive layer is similar to the thermoplastic inner layer body. In the bonding step, an inner layer body extrusion process in which a resin inner layer body is extruded to a predetermined thickness and an adhesive layer in which an adhesive layer is extruded and formed on the outer peripheral surface of the inner layer body are formed. An extrusion step, a metal tube forming step of forming a metal tube on the outer peripheral surface of the adhesive layer, and heat bonding in which the inner layer body and the metal tube are integrated via the adhesive layer by heating at a predetermined temperature. The steps are carried out in this order, and the pressure-melted adhesive layer has an anchor effect, and the outer diameter of the metal tube is formed to be 25 times or more and 100 times or less the wall thickness of the metal tube, and the adhesion is performed. It is a method for manufacturing an electric wire with an electromagnetically shielded tube that forms an adhesive strength between the metal tube and the inner layer body by a layer of 3 MPa or more.

The electric wire may be one or more electric wires alone, or may be a wire harness in which a plurality of electric wires are put together.
Rutowa to form the metal tube, and the case of forming the metal tube of the tubular against the facing ends of the metal plate, if by overlapping ends of the metal plate to form the metal tube of a tubular such as including.
The heating at the predetermined temperature includes, for example, heating from the outside of the metal tube formed on the outer peripheral surface of the adhesive layer with a heater or the like, ultrasonic heating of the metal tube, and the like.
According to the present invention, the electromagnetic shield tube can be made lighter, and bending can be performed even if the wall thickness of the metal tube is reduced, the shielding performance can be ensured, and the electric wire inserted inside can be reliably protected. can do.

Further, in the prior SL bonding process, the inner layer body extrusion forming extruded to the inner layer of the resin becomes a predetermined thickness, and the adhesive layer extrusion process for extruding forming an adhesive layer on the outer circumferential surface of the inner layer member, The metal tube forming step of forming a metal tube on the outer peripheral surface of the adhesive layer and the heat bonding step of heating at a predetermined temperature to integrate the inner layer body and the metal tube via the adhesive layer are performed in this order. in line Utame, the inner member, while maintaining a desired thickness can be adhered to the inner peripheral surface of the metal tube. Therefore, the inner layer body and the metal tube can be integrated via the adhesive layer.

Further, as an aspect of the present invention, the electromagnetically shielded tube is composed of at least one straight tube portion extending in a predetermined direction and at least one curved tube portion bent with respect to the straight tube portion. The electric wire may be attached, or after the bonding step and the insertion step, a bending step of bending the electric wire with an electromagnetically shielded tube according to the arrangement of the electric wire may be performed.
According to the present invention, it is possible to construct the electromagnetically shielded electric wire having a desired shape according to the wiring path.

INDUSTRIAL APPLICABILITY According to the present invention, there is provided a method for manufacturing an electromagnetic shield tube, an electric wire with an electromagnetic shield tube, and an electric wire with an electromagnetic shield tube that can protect the electric wire that is inserted inside even if bent while reducing the weight. can do.

An enlarged perspective view of one end of the electromagnetic shield tube. Schematic cross-sectional view of the electromagnetic shield tube. Schematic perspective view of a harness with a shield tube. Schematic flow chart of a manufacturing method of a harness with a shield tube. Explanatory drawing of bending process of harness with shield tube. Explanatory drawing about the inner support of the inner layer body in a harness with a shield tube. An enlarged perspective view of one end of an electromagnetically shielded tube of another embodiment. Schematic cross-sectional view of an electromagnetically shielded tube of another embodiment. The schematic perspective view of the harness with a shield tube of another embodiment. The schematic flow chart of the manufacturing method of the harness with a shield tube of another embodiment.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows an enlarged perspective view of one end of the electromagnetic shield tube 10, FIG. 2 shows a schematic cross-sectional view of the electromagnetic shield tube 10, and FIG. 3 shows a wire harness 1 with an electromagnetic shield tube (hereinafter, with a shield tube). A schematic perspective view of the harness 1) is shown, FIG. 4 shows a schematic flow diagram of a method for manufacturing the harness 1 with a shield tube, FIG. 5 shows an explanatory view of bending of the harness 1 with a shield tube, and FIG. 6 shows a shield. An explanatory view of the inner support of the inner layer body 12 in the harness 1 with a tube is shown.

More specifically, FIG. 1 is an enlarged perspective view of one end of the electromagnetic shield tube 10, and in order to clarify the layer structure, the metal tube 11, the inner layer body 12, and the adhesive layer 13 are on the front side in the circumferential direction. A part is shown in a transparent state. In FIGS. 1 and 2, the wire harness 20 that is inserted into the metal tube 11 to form the harness 1 with a shield tube is shown by a broken line.

Further, FIG. 5A shows a schematic view of a state in which a linear harness with a shield tube 1 is arranged on the bender device 100 in order to form a curved tube portion 3 of the harness 1 with a shield tube, and FIG. ) Shows a schematic view of a state in which the harness 1 with a shield tube is started to be bent by the bender device 100, and FIG. 5 (c) shows a schematic view of a state in which the bent tube portion 3 is formed by bending the harness 1 with a shield tube by the bender device 100 at a predetermined angle. ing.

Further, FIG. 6A shows a cross-sectional view of the harness 1 with a shield tube in the bent tube portion 3 that has been bent, and FIG. 6B shows an enlarged view of each portion in FIG. 6A. .. Note that FIG. 6 assumes bending in the left-right direction on the drawing, and FIG. 6A shows a cross section flattened by bending with a broken line.

The electromagnetically shielded tube 10 is composed of a tubular metal tube 11, an inner layer body 12 arranged on the inner circumference of the metal tube 11, and an adhesive layer 13 for adhering the metal tube 11 and the inner layer body 12.
The metal tube 11 is a cylindrical metal tube that prevents the radiation of noise generated from the wire harness 20 inserted therein and the intrusion of noise into the inside. In the present embodiment, the wall thickness t11 is about 0. It is made of 5 mm aluminum and is formed in a cylindrical shape having an outer diameter X11 of 24.5 mm.

Further, the metal tube 11 forms the above-mentioned cylindrical shape by butt-welding the ends of aluminum strips having a thickness of about 0.5 mm and a predetermined width to each other, but the ends are overlapped with each other to form the above-mentioned cylindrical shape. Or a seamless tube made of aluminum may be used.

The inner layer body 12 constituting the electromagnetic shield tube 10 is a thermoplastic resin having the required performance required for protecting the wire harness 20 such as desired wear resistance, and is equal to or more than the wall thickness t11 of the metal tube 11. The wall thickness is t12, and an internal space 12a through which the wire harness 20 can be inserted is formed inside. The inner diameter X12 of the inner layer body 12 forming the internal space 12a is 1.1 times or more the apparent outer diameter X20 of the wire harness 20 described later.

In the present embodiment, the inner layer body 12 is a crystalline thermoplastic resin, and is preferably polyethylene. Here, it is made of low-density polyethylene (LDPE), which is also called soft polyethylene, and has a wall thickness t12 thicker than the wall thickness t11 (0.5 mm) of the metal tube 11 of 1.2 mm. Further, the inner diameter X12 of the inner layer body 12 is formed to be 21 mm, and is formed to be about 1.1 times the apparent outer diameter X20 (19 mm) of the wire harness 20 described later.

The inner layer body 12 configured in this way dissolves and pressurizes the adhesive layer 13 made of an adhesive which is a similar material to the inner layer body 12 on the inner surface of the metal tube 11 to obtain a so-called anchor effect. It is fixed and integrated by the accompanying adhesion.

The adhesive layer 13 in the present embodiment using the inner layer 12 made of low density polyethylene (LDPE) has a polyethylene hot melt adhesive having a composition similar to that of the low density polyethylene (LDPE) in which the main component constitutes the inner layer 12. It is composed of an agent, and the adhesive strength of the adhesive layer 13 for adhering the metal tube 11 and the inner layer 12 is 10 MPa per unit area, and the layer thickness t13 is 0.2 mm. There is.
Here, the adhesive strength per unit area of the adhesive layer 13 is preferably 3 MPa or more, more preferably 7 MPa or more, and not limited to 10 MPa.

Further, the harness 1 with a shield tube can be configured by inserting the wire harness 20 into the internal space 12a of the inner layer body 12 in the electromagnetic shield tube 10 configured in this way.

The wire harness 20 inserted into the internal space 12a is composed of a plurality of coated electric wires 21 in which a conductor made of a copper alloy is coated with an insulating coating. More specifically, the wire harness 20 of the present embodiment comprises two large-diameter electric wires 21a and two small-diameter electric wires 21b. The large-diameter electric wire 21a is a 20 sq-coated copper wire having an outer diameter of φ9.6 mm, and the small-diameter electric wire 21b is a 3 sq-coated copper wire. Therefore, the apparent outer diameter X20 of the wire harness is 19 mm.

Further, as shown in FIG. 3, the harness 1 with a shield tube formed by inserting the wire harness 20 into the internal space 12a of the electromagnetic shield tube 10 is formed by the straight tube portion 2 and the curved tube portion 3 in a three-dimensional shape. ing.
The harness 1 with a shield tube of the present embodiment shown in FIG. 3 has a first straight tube portion 2a, a first curved tube portion 3a, and a second straight tube portion 2b on which the ground contact portion 16 is formed from the front side in FIG. , The second curved pipe portion 3b, the third straight pipe portion 2c, the third curved pipe portion 3c, the fourth straight pipe portion 2d, the fourth curved pipe portion 3d, and the fifth straight pipe portion 2e are arranged in this order. It is configured to have a three-dimensional shape, and both ends of the wire harness 20 project from both ends.

Next, a method of manufacturing the harness 1 with a shield tube configured in this way will be described with reference to FIG.
First, the resin constituting the inner layer body 12 is extruded and molded, and the diameter is fixed (inner layer extrusion / diameter constant step: step s1). In the inner layer extrusion / sizing step (step s1) in the present embodiment, the diameter is stipulated by the vacuum sizing to the above-mentioned predetermined thickness and the outer diameter corresponding to the inner diameter of the metal tube 11.

Subsequently, an adhesive layer extrusion step (step s2) of extruding and molding the adhesive constituting the adhesive layer 13 is performed on the outer peripheral surface of the inner layer 12 having a fixed diameter, and the adhesive is adhered to the outer peripheral surface of the inner layer 12. The layer 13 is formed.

Then, the inner layer body 12 having the adhesive layer 13 formed on the outer peripheral surface is bent into aluminum strips having a predetermined thickness and a predetermined width, and the ends are butt-welded to form a tubular metal tube forming. (Metal tube forming step: step s3), heating is performed, and a heat welding step (step s4) of passing a diameter-reducing die to reduce the diameter is performed to manufacture the electromagnetic shield tube 10.

In this heat-bonding step (step s4), the metal tube 11 is heated from the outside of the metal tube 11 formed on the outer peripheral surface of the adhesive layer 13 by a heater and is reduced in diameter by passing the reduced-diameter die. The adhesive layer 13 melted by heating is pressurized by the pressure from the outer diameter to the inner diameter, and an adhesive state capable of exerting the above-mentioned anchor effect can be obtained.
In the heat-bonding step (step s4), the adhesive layer 13 is melted by heating from the outside of the metal tube 11. For example, the adhesive layer 13 is melted by ultrasonically heating the metal tube 11. The heating method may be changed as appropriate.

The electromagnetic shield tube 10 manufactured in this manner is linear, and a wire harness 20 having a predetermined length is inserted into the internal space 12a of the linear electromagnetic shield tube 10 to form a harness 1 with a shield tube (electric wire). Insertion step: Step s5). Further, when the harness 1 with a shield tube has a shape having a straight tube portion 2 and a curved tube portion 3, the linear harness with a shield tube 1 is bent (bending step: step s6). If the harness 1 has a linear shield tube, the bending step (step s6) is unnecessary.

In this bending process (step s6), the bent tube portion 3 is formed with respect to the linear harness with a shield tube 1 by using the bender device 100 as shown in FIG.
The bender device 100 that forms the curved tube portion 3 with respect to the harness 1 with a shield tube has mainly a clamp die 101 and a vent die 102 for bending the harness 1 with a shield tube, and a pressure that constitutes a reaction force. There is a die 103.

Specifically, the clamp die 101 and the vent die 102 that grip the harness 1 with a shield tube on the bending side (harness 1 with a shield tube on the left side in FIG. 5), and the harness 1 with a shield tube on the bending side (the shield on the right side in FIG. 5). A pressure die 103 that constitutes the reaction force of the harness 1) with a tube and applies a tensile force to the harness 1 with a shield tube on the bent side in the direction opposite to the direction in which the tube travels (the direction indicated by the arrow a in FIG. 5). I have.

The bent die 102 can rotate about the rotation center 102a, and is composed of a straight portion 102b and an arc portion 102c.
The clamp die 101 is a clamp material that grips the harness 1 with a shield tube on the bending side by approaching the straight portion 102b of the vent die 102 by sandwiching it with the straight portion 102b.

The pressure die 103 is arranged outside the diameter in the bending direction of the harness 1 with a shield tube on the bendable side, presses the harness 1 with a shield tube toward the vent die 102, and is in the direction opposite to the direction in which the tube travels (arrow in FIG. 5). It is configured to apply a tensile force in the direction indicated by a).

A groove (not shown) having an arcuate cross section in which the electromagnetic shield tube 10 is fitted is formed in a portion of the clamp die 101, the vent die 102, and the pressure die 103 facing the harness 1 with a shield tube. In particular, the groove formed in the arc portion 102c of the bent die 102 is formed by a groove having a curvature corresponding to the curvature of bending the harness 1 with a shield tube.

In order to form the curved tube portion 3 with respect to the harness 1 with a linear shield tube using the bender device 100 configured in this way, first, as shown in FIG. 5A, a linear shield is formed. The harness 1 with a tube is set in the bender device 100. At this time, the pressure die 103 is arranged outside the bending direction diameter (upper side in the drawing in FIG. 5) of the harness 1 with a shield tube on the bending side, and the harness 1 with a shield tube on the bending side is connected to the straight portion 102b of the vent die 102. It is sandwiched between the clamp die 101 and fixed.

Then, as shown in FIG. 5B, the clamp die 101 and the vent die 102 are rotated around the rotation center 102a together with the harness 1 with a shield tube that is sandwiched and fixed, and the harness 1 with a shield tube is bent. .. At this time, the pressure die 103 presses the harness 1 with a shield tube on the bendable side toward the vent die 102, and also applies a pulling force in the direction of arrow a (opposite to the tube traveling direction) shown in FIG. 5 (b) to the shield tube. Attached to the attached harness 1.

In this way, the harness 1 with a shield tube on the side bent by the pressure die 103 is pressed against the vent die 102, and a pulling force in the direction of arrow a (opposite to the tube traveling direction) shown in FIG. 5 (b) is applied. Since the harness 1 with a shield tube is fixed to the bent die 102 by the clamp die 101, the harness 1 is wound around the arc portion 102c according to the curvature of the arc portion 102c of the bent die 102 as the vent die 102 rotates. Bending is formed, and as shown in FIG. 5C, a bent tube portion 3 having a desired bending shape is formed on the harness 1 with a shield tube, and the harness 1 with a shield tube having a desired shape as shown in FIG. 4 is formed. Can be configured.

In this way, the tubular metal tube 11, the resin inner layer 12 formed on the inner circumference of the metal tube 11, the inner peripheral surface of the metal tube 11 and the outer peripheral surface of the inner layer 12 are adhered and integrated. The outer diameter X11 of the metal tube 11 is 25 times or more and 100 times or less the wall thickness t11 of the metal tube 11, and the inner peripheral surface and inner layer body 12 of the metal tube 11 by the adhesive layer 13 are provided. The electromagnetic shield tube 10 having an adhesive strength of 3 MPa or more with the outer peripheral surface of the metal tube 10 can be reduced in weight, and a wire harness that allows the inside to be inserted even if the electromagnetic shield tube 10 having a thin metal tube 11 with a thin wall thickness t11 is bent. 20 can be protected.

More specifically, when the outer diameter X11 of the metal tube 11 is less than 25 times the wall thickness t11 of the metal tube 11, that is, the wall thickness is larger than 1/25 with respect to the metal tube 11 having a predetermined outer diameter X11. In this case, since the wall thickness is thicker than the outer diameter X11, sufficient weight reduction cannot be achieved.

On the other hand, when the outer diameter X11 of the metal tube 11 is larger than 100 times the wall thickness t11 of the metal tube 11, that is, when the wall thickness is less than 1/100 of the metal tube 11 having a predetermined outer diameter X11. , The wall thickness is too thin for the outer diameter X11. Therefore, the metal tube 11 may be damaged and cracked, and the shielding performance for blocking noise may be deteriorated.

Further, when the metal tube 11 is bent, the cross section of the electromagnetic shield tube 10 may be flattened or damaged due to the bending load. In this case, the wire harness 20 to be inserted inside is pressed. It may be damaged.

On the other hand, by making the outer diameter X11 of the metal tube 11 25 times or more and 100 times or less the wall thickness t11 of the metal tube 11, the wall thickness t11 of the metal tube 11 is thinned and the electromagnetic shield tube 10 is made lighter. At the same time, the shielding property of the electromagnetic shield tube 10 can be ensured.

Further, since the adhesive strength of the adhesive layer 13 for adhering the inner layer body 12 and the metal tube 11 is 3 MPa or more, the inner layer body adhered to the metal tube 11 even when the electromagnetic shield tube 10 is bent. It is possible to prevent the 12 from peeling off from the inner peripheral surface of the metal tube 11, and the inner layer 12 can internally support the metal tube 11 on which the bending load acts.

As a result, it is possible to prevent the metal pipe 11 in the curved pipe portion 3 from being crushed and the cross section being flattened or damaged. Therefore, the wire harness 20 that is inserted inside can be reliably protected, and the radiation of noise generated from the wire harness 20 and the intrusion of noise from the outside can be prevented.

More specifically, as shown by the broken line in FIG. 6A, when the harness 1 with a shield tube is bent by using the bender device 100 in order to form the curved tube portion 3, the shield tube has a circular cross section. The attached harness 1 attempts to flatten in a direction intersecting the bending direction. As described above, FIG. 6 shows a cross-sectional view of the curved pipe portion 3 whose bending direction is the left-right direction on FIG. Therefore, by bending, the circular cross section is crushed in the left-right direction and tries to be deformed into a vertically long flat shape.

When trying to deform into a vertically long flat shape, among the harness 1 with a shield tube having a circular cross section, the metal tube 11 having the upper part of the cross section shown in part a, the lower part of the cross section shown in part b, and the outer diameter of the cross section shown in part c , As shown in FIG. 6B, it tries to deform outward. However, since the outer peripheral surface of the inner layer body 12 arranged inside the metal tube 11 and the inner peripheral surface of the metal tube 11 are bonded by the adhesive layer 13 having an adhesive strength of 3 MPa or more, the upper part of the cross section, the lower part of the cross section and When the metal tube 11 having an outer cross-sectional diameter tries to be deformed outward, it tries to be deformed outward together with the inner layer 12 via the adhesive layer 13, that is, with respect to the outward deformation of the metal tube 11. The inner layer body 12 can resist the deformation of the metal tube 11.

Further, the metal tube 11 inside the cross-sectional diameter shown in the d portion tends to be deformed inward in the cross section. However, since the inner layer body 12 is arranged on the inner surface side of the metal tube 11 having the inner cross-sectional diameter to be deformed inward, the inner layer body 12 is subjected to the inward deformation of the metal tube 11 having the inner cross-sectional diameter. Against this, the deformation of the metal tube 11 can be supported internally.

In this way, the electromagnetic shield tube 10 provided with the metal tube 11 whose outer diameter X11 of the metal tube 11 is 25 times or more and 100 times or less of the wall thickness t11 of the metal tube 11 and whose wall thickness is thin enough to reduce the weight. Even if there is, since the metal tube 11 and the inner layer body 12 are bonded by the adhesive layer 13 having an adhesive strength of 3 MPa or more, the inner layer body 12 internally supports the cross-sectional deformation of the metal tube 11 and the harness with a shield tube. It is possible to prevent the cross section of 1 from being flattened.

Further, since the wall thickness t12 of the inner layer body 12 is 1.5 times or more the wall thickness t11 of the metal tube 11, that is, because the inner layer body 12 has a sufficient thickness with respect to the metal tube 11, the wire Since the harness 20 can be sufficiently protected and the metal tube 11 and the inner layer body 12 are integrated, the electromagnetic shield tube 10 having a high apparent cross-sectional rigidity can be formed.

Therefore, when the curved pipe portion 3 is formed in the metal pipe 11 (harness 1 with a shield pipe), the inner layer body 12 internally supports the metal pipe 11 to be bent as described above from the inner surface side. , The metal pipe 11 in the curved pipe portion 3 can be surely prevented from being crushed and the cross section being flattened or damaged.

Further, since the inner layer body 12 made of low density polyethylene (LDPE), which is also called soft polyethylene, and the adhesive layer 13 which is a polyethylene hot melt adhesive have the same composition as the main components, the inner layer body 12 is made of a metal tube 11. As a result, the wire harness 20 can be more reliably protected and the inner layer body 12 can have a desired thickness, so that the wire harness 20 can be more reliably protected and internally supported.

More specifically, since the inner layer 12 and the adhesive layer 13 are made of the same composition material, the inner layer 12 and the metal tube 11 can be more reliably bonded by heating and melting the adhesive layer 13. The metal tube 11 in the curved tube portion 3 can be more reliably internally supported by the inner layer body 12.

Further, the inner layer body 12 secures a desired thickness as the inner layer body 12, and the inner layer body 12 having the desired thickness secured is adhered to the metal tube 11 by the adhesive layer 13 whose layer thickness (t13) is difficult to be constant. A resin layer having a wall thickness of t12 or more can be reliably formed on the inner surface of the metal tube 11.

Therefore, the wire harness 20 can be protected more reliably, and the inner layer body 12 can more reliably support the inner peripheral surface of the metal tube 11 in the metal tube 11 in the curved tube portion 3, and the metal tube 11 can be bent. It is possible to more reliably prevent the cross section from being crushed and flattened or damaged.

Further, in the metal tube 11, the inner layer 12 arranged via the adhesive layer 13 is not melted by heating as compared with the case where the adhesive layer having high thermal conductivity is used, so that the inner layer 12 is not melted. Since the inner peripheral surface does not become uneven, that is, a smooth inner peripheral surface is formed, the wire harness 20 can be inserted inside without being caught by the inner peripheral surface, and the work efficiency can be improved. it can.

Further, since the layer thickness t13 of the adhesive layer 13 is set to 0.2 mm, which is 0.05 mm or more and 0.50 mm or less, the inner layer body 12 can be reliably and firmly adhered to the metal tube 11, and the metal tube 11 can be firmly and firmly adhered. It is possible to prevent flattening and damage of the cross section.

More specifically, when the layer thickness t13 of the adhesive layer 13 is less than 0.05 mm, uneven adhesive layer 13, that is, the adhesive layer 13 is uneven, and the inner layer body 12 and the metal tube 11 are not adhered to each other. Part may occur. Further, since the layer thickness t13 of the adhesive layer 13 is thin, the connecting layer side of the inner layer body 12 is melted by heating in the heat bonding step (step s4) for adhering the metal tube 11 and the inner layer body 12, and the inner layer body 12 is required. It may not be possible to maintain the specified thickness.

On the contrary, when the layer thickness t13 of the adhesive layer 13 is made larger than 0.50 mm, a portion where the adhesive layer 13 cannot be melted by heating occurs, and unevenness is formed in the adhesion between the metal tube 11 and the inner layer body 12, and the curved tube portion. In the metal tube 11 of No. 3, the inner layer body 12 is likely to be peeled off, and the inner layer body 12 may not be able to provide the inner support as described above for the flattening of the cross section of the metal tube 11 in the curved tube portion 3.

On the other hand, by forming the layer thickness t13 of the adhesive layer 13 to 0.2 mm, which is 0.05 mm or more and 0.50 mm or less, the adhesive layer 13 can be reliably melted, and the metal tube 11 and the inner layer body 12 can be separated. It can be firmly and firmly adhered through the adhesive layer 13. Therefore, in the curved tube portion 3, the inner layer body 12 does not peel off from the metal tube 11, the wire harness 20 can be protected more reliably, and the metal tube 11 is surely inside against deformation in which the cross section is flattened by bending. Can be supported.

Further, since the inner diameter X12 of the inner layer body 12 is formed to be 21 mm, which is 1.1 times or more the apparent outer diameter X20 of the wire harness 20 to be inserted into the metal pipe 11, the metal pipe 11 in the curved pipe portion 3 The wire harness 20 can be inserted without contacting the inner layer body 12, and even when the metal tube 11 has a flat cross section, the inserted wire harness 20 can be prevented from being damaged.

More specifically, by adhering the inner layer body 12 and the metal tube 11, it is possible to prevent or suppress flattening of the cross section of the metal tube 11 in the curved tube portion 3, but the inner layer depends on the degree of bending of the metal tube 11. The body 12 will be partially biased inward. If the inner diameter X12 of the inner layer 12 is less than 1.1 times the apparent outer diameter X20 of the wire harness 20 to be inserted into the metal tube 11, the wire through which the inner layer 12 is inserted into the curved tube 3 The harness 20 may be pressed and the wire harness 20 may be damaged.

On the other hand, by forming the inner diameter X12 of the inner layer body 12 to be 1.1 times or more the apparent outer diameter X20 of the wire harness 20 to be inserted into the metal tube 11, the inner layer is formed even if the metal tube 11 is bent. Since a penetration space of a desired size is formed inside the body 12, the wire harness 20 can be inserted without abutting against the inwardly biased inner layer body 12, and the wire harness 20 is damaged in the curved pipe portion 3. Can be prevented.
Further, even if the cross section of the metal tube 11 is slightly flattened, it is possible to prevent the inserted wire harness 20 from being pressed against the inner surface of the metal tube 11 and being damaged.

Further, in the method for manufacturing a harness 1 with a shield tube composed of the electromagnetic shield tube 10 and the wire harness 20 inserted through the metal tube 11, the resin inner layer 12 is extruded to a predetermined thickness. An inner layer extrusion / diameter reduction step (step s1) to be formed, an adhesive layer extrusion step (step s2) to extrude an adhesive layer 13 on the outer peripheral surface of the inner layer body 12, and a metal tube 11 on the outer peripheral surface of the adhesive layer 13. The metal tube forming step (step s3) to be formed and the heat bonding step (step s4) in which the inner layer body 12 and the metal tube 11 are integrated via the bonding layer 13 by heating at a predetermined temperature are performed in this order. As a result, the inner layer body 12 can be adhered to the inner peripheral surface of the metal tube 11 while maintaining the desired thickness. Therefore, the inner layer body 12 and the metal tube 11 can be integrated via the adhesive layer 13.

Further, after the heat bonding step (step s4) and the electric wire insertion step (step s5), a bending process (step s6) is performed in which the harness 1 with a shield tube is bent according to the wiring of the wire harness 20. It is composed of at least one straight pipe portion 2 extending in a predetermined direction and at least one curved pipe portion 3 bent with respect to the straight pipe portion 2, and has a shield pipe having a desired shape according to the wiring route. The harness 1 can be configured.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment, the electric wire of the present embodiment corresponds to the wire harness 20.
Similarly below
The metal tube corresponds to the metal tube 11
The inner layer corresponds to the inner layer 12,
The adhesive layer corresponds to the adhesive layer 13 and
The outer diameter corresponds to the outer diameter X11, and the wall thickness of the metal tube corresponds to the wall thickness t11.
The wall thickness of the inner layer corresponds to the wall thickness t12,
The thickness of the adhesive layer corresponds to the layer thickness t13,
The electromagnetic shield tube corresponds to the electromagnetic shield tube 10.
The inner diameter corresponds to the inner diameter X12,
The outer diameter of the wire corresponds to the apparent outer diameter X20,
The electric wire with electromagnetic shield tube corresponds to the harness 1 with shield tube.
The straight pipe part corresponds to the straight pipe part 2,
The curved pipe part corresponds to the curved pipe part 3,
The bonding process corresponds to the inner layer extrusion / diameter reduction process (step s1) to the heat bonding process (step s4).
The insertion process corresponds to the wire insertion process (step s5).
The inner layer extrusion process corresponds to the inner layer extrusion / diameter reduction process (step s1).
The adhesive layer extrusion process corresponds to the adhesive layer extrusion process (step s2).
The metal tube forming step corresponds to the metal tube forming step (step s3).
The heat bonding step corresponds to the heat bonding step (step s4).
Although the bending process corresponds to the bending process (step s6), the bending process is not limited to the above embodiment.

For example, in the above description, an aluminum tube is used as the metal tube 11, but a copper tube may be used, or a metal tube formed of a metal mesh plate may be used.
Further, an inner layer body 12 made of low density polyethylene (LDPE), which is also called soft polyethylene, was used, and a polyethylene hot melt adhesive having a composition similar to that of the inner layer body 12 was used as the adhesive layer 13, but it was composed of another resin. May be good. Further, the shape and thickness of the metal tube 11, the inner layer body 12 or the adhesive layer 13 are not limited to the above-described embodiment, and an appropriate size and shape may be used.

Further, the adhesive strength of the adhesive layer 13 may be configured to be an appropriate strength. Although the adhesive strength per unit area was used as the adhesive strength between the inner peripheral surface of the metal tube 11 and the outer peripheral surface of the inner layer body 12 by the adhesive layer 13, the inner peripheral surface of the metal tube 11 and the outer peripheral surface of the inner layer body 12 were used. The adhesive strength as a whole with the surface or the value obtained by dividing the total adhesive strength by the inner peripheral length of the metal tube 11 may be set as the adhesive strength.

Further, although the wire harness 20 in which a plurality of covered electric wires 21 are put together is inserted into the electromagnetic shield tube 10 to form the harness 1 with a shield tube, the number and diameter of the coated electric wires 21 constituting the wire harness 20 to be inserted inside are formed. Is not limited to this, and a wire harness 20 may be formed by collectively forming covered electric wires 21 having an appropriate number and diameter, or a shield tube by inserting a plurality of or one covered electric wire 21 instead of the wire harness 20. A harness may be configured.

Further, in the above description of the harness 1 with a shield tube, the wire harness 20 is inserted into the internal space 12a of the electromagnetic shield tube 10 to form the harness 1 with a shield tube. As shown in FIGS. 7 to 10, A harness 1a with a shield tube may be used, which is provided on the outer periphery of the metal tube 11 and uses an electromagnetic shield tube 10a provided with a resin outer layer 14 integrated with the metal tube 11.

As shown in FIGS. 7 to 10, the harness 1a with a shield tube is provided with an outer layer 14 on the outer surface of the electromagnetic shield tube 10a in which the wire harness 20 is inserted into the internal space 12a.

7 is an enlarged perspective view of one end of the harness 1a with a shield tube, FIG. 8 is a schematic cross-sectional view of the harness 1a with a shield tube, and FIG. 9 is a schematic perspective view of the harness 1a with a shield tube. FIG. 10 shows a schematic flow chart of a method for manufacturing a harness 1a with a shield tube.

More specifically, FIG. 7 is an enlarged perspective view of one end of the harness 1a with a shield tube, and in order to clarify the layer structure, a part of the electromagnetic shield tube 10a on the front side in the circumferential direction is shown in a transparent state. Shown.
The metal tube 11, the inner layer 12, the adhesive layer 13, and the wire harness 20 in the electromagnetic shield tube 10a constituting the harness 1a with the shield tube are the same as the electromagnetic shield tube 10 and the wire harness 20 of the harness 1 with the shield tube described above. Since the configuration is the same, the description thereof will be omitted.

The outer layer 14 provided on the outer periphery of the electromagnetically shielded tube 10a, that is, the outer periphery of the metal tube 11, has the required performance required for protecting the metal tube 11 such as desired durability, weather resistance, cushioning property, and elasticity. At the same time, the wall thickness t14 is made of resin having a wall thickness of 0.2 mm or more and 0.8 mm or less, and is formed in orange, which is a caution color.

In the present embodiment, the outer layer 14 provided on the outer periphery of the cylindrical metal tube 11 having an outer diameter X11 of 24.5 mm is made of cross-linked polyethylene (crosslinked PE) having a wall thickness t14 of about 0.45 mm. Has been done. The outer layer body 14 may be made of general polyethylene (PE).

In addition, cross-linked polyethylene is an ultra-high molecular weight polyethylene having a three-dimensional network structure in which chain-structured polyethylene molecules as thermoplastics are dispersedly bonded to each other, and is lightweight, flexible, corrosion-resistant, impact-resistant, and low-temperature. In addition to the performance of polyethylene itself, which is excellent in properties and electrical properties, it is characterized by improved environmental stress fracture resistance, creep performance, chemical resistance, and heat aging resistance.

The metal tube 11 and the outer layer body 14 configured in this way are integrated by intermolecular bonds between the outer surface of the metal tube 11 and the inner surface of the outer layer body 14.
More specifically, aluminum oxide (Al ₂ O ₃ ) is formed on the outer surface of the aluminum metal tube 11, and aluminum oxide (Al ₂ O ₃ ) has polarity, so that the moisture in the atmosphere There is a portion where the terminal becomes a hydroxyl group (OH group) due to the hydration reaction by. By hydrogen bonds (intermolecular bonds), the hydroxyl groups (OH groups) in the aluminum oxide (Al ₂ O ₃ ) and the hydroxyl groups (OH groups) in the cross-linking agent in the hydrolyzed outer layer 14 are bonded by a condensation reaction. The outer surface of the metal tube 11 and the inner surface of the outer layer 14 are bonded to each other, and the metal tube 11 and the outer layer 14 are integrated.

Although this hydrogen bond (intermolecular bond) has a lower adhesive force than a chemical bond such as an ionic bond, it is bonded by adsorption due to the force of attracting atoms to each other, so that the metal tube 11 and the outer layer 12 are 0. It is integrated with a bond strength of 5.5 MPa or more and 4.0 MPa or less.

In this way, the metal tube 11 and the outer layer 14 are integrated by the intermolecular bond between the outer surface of the metal tube 11 and the inner surface of the outer layer 14 to form the electromagnetic shield tube 10a. Then, at least one of the ends of the electromagnetic shield tube 10a is formed with an earth contact portion 16 in which the outer layer body 14 having a predetermined length is not present and the metal tube 11 is exposed.

Further, the harness 1a with a shield tube can be configured by inserting the wire harness 20 into the internal space 12a of the inner layer body 12 in the electromagnetic shield tube 10a configured in this way.

Next, a method of manufacturing the harness 1a with a shield tube configured as described above will be described with reference to FIG.
The same applies to the heat bonding step (step s4) in the method for manufacturing the harness 1 with a shield tube described above. After the heat bonding step (step s4), a resin layer having a predetermined thickness is extruded from the outer peripheral side of the metal tube 11 reduced in diameter to a desired diameter to form an outer layer body 14 (outer layer extrusion step: step). s41), The end outer layer peeling step of peeling the outer layer 14 formed on the outer periphery at the end of the metal tube 11 by a predetermined length and exposing the metal tube 11 of the predetermined length to form the earth contact portion 16. (Step s42) is performed.

In this state, since the metal tube 11 and the outer layer 14 formed on the outer peripheral side are not integrated, the outer layer 14 is crosslinked, and as described above, the outer surface of the metal tube 11 and the inner surface of the outer layer 14 are crosslinked. The electromagnetically shielded tube 10a is manufactured by performing a heating cross-linking step (step s43) in which the metal tube 11 and the outer layer 14 are integrated by intermolecular bonding.

Since the post-process for manufacturing the harness 1a with a shield tube is the same as steps s5 and s6 in the method for manufacturing the harness 1 with a shield tube for the electromagnetic shield tube 10a manufactured in this manner, the description thereof is omitted. To do.

As described above, the inner layer body 12 bonded by the adhesive layer 13 is provided with the resin outer layer body 14 provided on the outer periphery of the tubular metal tube 11 arranged inside, and the metal tube 11 and the outer layer body 14 are combined. The electromagnetic shield tube 10a having an outer layer 14 having a thickness of 0.2 mm or more and 0.8 mm or less and the harness 1a with a shield tube in which the wire harness 20 is inserted into the electromagnetic shield tube 10a are the harness 1 with a shield tube described above. In addition to the effect of the above, the wire harness 20 inserted into the internal space 12a can be more reliably protected.

More specifically, when the thickness of the outer layer body 14 is less than 0.2 mm, it is necessary to exhibit the required performance required as the outer layer body for protecting the metal tube 11 such as durability, weather resistance, cushioning property and elasticity. The thickness cannot be secured due to, for example, chipping due to flying stones, changes in thickness due to bending, and thinning due to heat, and the outer layer 14 is damaged to expose the metal tube 11 to protect the metal tube 11. May not be possible.

On the contrary, when the thickness of the outer layer body 14 is 0.8 mm or more, the curvature of the bent portion of the electromagnetic shield tube 10a is significantly changed between the outer surface and the inner surface of the outer layer body 14, and the inside of the outer layer body 14 is changed. Will generate a large amount of stress. Therefore, wrinkles and the like may occur in the outer layer body 14, which may cause bending buckling due to an external force. Alternatively, it becomes a fatigue fracture factor due to wrinkles and the like.

On the other hand, as an outer layer body that protects the metal tube 11 by integrating the outer layer body 14 provided on the outer periphery of the metal tube 11 through which the wire harness 20 is inserted and having a thickness of 0.2 mm or more and 0.8 mm or less. Since the required performance can be exhibited, it is possible to prevent the metal pipe 11 from being dented or damaged by contact with flying stones or the like, and further to prevent the metal pipe 11 from being corroded. Therefore, the shielding performance can be ensured, and the wire harness 20 inserted in the internal space 12a can be more reliably protected.

Further, since the hardness of the outer layer body 14 is shore D40 or more and 60 or less, the electromagnetic shield tube 10a can be bent and damage to the outer layer body 14 can be prevented more reliably.
More specifically, by setting the hardness of the outer layer 14 to shore D40 or higher, it is possible to prevent chipping from occurring in the outer layer 14 due to flying stones or the like, and by setting the hardness of the outer layer 14 to shore D60 or lower, it is easy. Can be bent.

Further, since the bonding strength between the outer peripheral surface of the integrated metal tube 11 and the inner peripheral surface of the outer layer body 14 is 0.5 MPa or more and 4.0 MPa or less, the outer layer body 14 is formed when the electromagnetic shield tube 10a is bent. The outer layer body 14 can be made to follow the bending of the metal tube 11 without causing problems such as wrinkles, and the outer layer body 14 can be appropriately peeled off from the metal tube 11.

Specifically, when the bonding strength is less than 0.5 MPa, problems such as wrinkles occur in the outer layer 14 in which the metal tube 11 is displaced inside the bent portion of the electromagnetic shield tube 10a. Become.
In addition, the trouble such as wrinkles generated in the outer layer body 14 is caused between the arc portion 102c and the metal tube 11 in the vent die 102 of the bender device 100 that bends the electromagnetic shield tube 10a (harness 1 with the shield tube). It is sandwiched between the two, and an uneven shape is formed on the surface of the outer layer body 14.

On the other hand, by setting the bonding strength to 0.5 MPa or more, the outer layer body 14 can be made to follow the bending of the electromagnetic shield tube 10a, and problems such as wrinkles occur in the bending recesses of the outer layer body 14. This can be prevented, and the uneven shape can be prevented from being formed on the outer surface of the outer layer body 14.

Further, by setting the bonding strength to 4.0 MPa or less, the outer layer body 14 can be intentionally peeled off from the metal tube 11, and the metal tube 11 can be exposed without leaving a part of the outer layer body 14. .. Therefore, the end portion of the metal tube 11 can be intentionally exposed to a desired length.

Further, since the outer layer body 14 is colored orange, it is possible to form an orange electromagnetic shield tube 10a (harness 1a with a shield tube) having a desired color in appearance.
For example, when a high-pressure wire harness 20 is inserted into an electromagnetic shield tube 10a to form a harness 1a with a shield tube, the orange outer layer 14 which is the caution color can be visually confirmed, for example, for repair. It is possible to call attention so that the operator does not accidentally cut the electromagnetic shield tube 10a.

Further, for example, by changing the color of the outer layer body 14 not only in orange but also in accordance with the type of the wire harness 20 to be inserted, the connection destination, etc., the color of the outer layer body 14 is visually confirmed and the wire harness is used. It is possible to prevent mistakes in the 20 types and connection destination connections, and improve work efficiency.

Further, by grounding the metal pipe 11 via the ground contact portion 16 provided at the end of the metal pipe 11, noise is radiated to the outside from the wire harness 20 inserted into the internal space 12a of the inner layer body 12. It is possible to reliably prevent noise from entering the internal space 12a from the outside of the metal tube 11, and it is possible to more reliably prevent malfunction of electronic devices.

Further, as a method for manufacturing the harness 1a with a shield tube, an outer layer extrusion step (step s41) in which the outer layer body 14 is pressed and extruded together with the metal tube 11 so as to have a predetermined thickness, and extrusion processing is performed at the end of the metal tube 11. An end outer layer peeling step (step s42) in which the outer layer 14 is peeled off to a predetermined length, and a heating cross-linking step (step s42) in which the outer layer 14 is crosslinked by heating at a predetermined temperature to integrate the metal tube 11 and the outer layer 14. Since steps s43) are performed in this order, the outer surface of the metal tube 11 and the inner surface of the outer layer 14 can be integrated by intermolecular bonds.
Therefore, the metal tube 11 and the outer layer 14 can be integrated with a desired bonding strength without using another material such as an adhesive.

The outer layer 14 may be made of a resin other than cross-linked polyethylene (cross-linked PE). Further, the shape and thickness of the metal tube 11 and the outer layer 14 are not limited to the above-described embodiment, and an appropriate size and shape may be used.

Further, in the above-mentioned harness with a shield tube, the ground contact portion 16 is provided at one end of the electromagnetic shield tube 10a, but of course, the ground contact portion 16 may be provided at the opposite end, or at both ends. The ground contact portion 16 may be provided. If the metal tube 11 can be grounded by another means, the ground contact portion 16 may not be provided.

Furthermore, in the electromagnetic shield tube 10a, the metal tube 11 and the outer layer 14 are integrated by intermolecular bonds between the outer surface of the metal tube 11 and the inner surface of the outer layer 14, but the metal tube 11 and the outer layer are adhered to each other. The body 14 may be integrated, or may be integrated by friction between the outer surface of the metal tube 11 and the inner surface of the outer layer body 14.

1,1a ... Harness with shield tube 2 ... Straight tube part 3 ... Curved tube part 10, 10a ... Electromagnetic shield tube 11 ... Metal tube 12 ... Inner layer 13 ... Adhesive layer 20 ... Wire harness t11, t12 ... Wall thickness t13 ... Layer Thickness X11, X20 ... Outer diameter X12 ... Inner diameter s1 ... Inner layer extrusion / fixed diameter process s2 ... Adhesive layer extrusion process s3 ... Metal tube forming process s4 ... Heat bonding process s5 ... Electric wire insertion process s6 ... Bending process

Claims (8)

A tubular metal tube through which an electric wire is inserted and
A resin inner layer formed on the inner circumference of the metal tube and
An adhesive layer for adhering and integrating the inner peripheral surface of the metal tube and the outer peripheral surface of the inner layer body is provided.
The outer diameter of the metal pipe is 25 times or more and 100 times or less the wall thickness of the metal pipe.
The adhesive layer is composed of a composition material similar to the thermoplastic inner layer body.
The pressure-melted adhesive layer has an anchor effect, and the adhesive strength between the inner peripheral surface of the metal tube and the outer peripheral surface of the inner layer body by the adhesive layer is 3 MPa or more. The electromagnetic shield tube according to claim 1, wherein the wall thickness of the inner layer is 1.5 times or more the wall thickness of the metal tube. The electromagnetic shield tube according to claim 1 or 2, wherein the thickness of the adhesive layer is 0.05 mm or more and 0.50 mm or less. The electromagnetic shield tube according to any one of claims 1 to 3 , wherein the inner diameter of the inner layer is 1.1 times or more the outer diameter of the electric wire to be inserted into the metal tube. The electromagnetically shielded tube according to any one of claims 1 to 4 .
An electric wire with an electromagnetic shield tube composed of an electric wire inserted through the metal tube. The electromagnetic shield tube
At least one straight pipe extending in a predetermined direction,
The electric wire with an electromagnetic shield tube according to claim 5 , which is composed of at least one curved tube portion bent with respect to the straight tube portion. The inner layer in an electromagnetic shield tube composed of a tubular metal tube, a resin inner layer bonded to the inner circumference of the metal tube, and an adhesive layer adhering the metal tube and the inner layer to the metal. The bonding process of bonding and integrating with the pipe,
The insertion step of inserting the electric wire into the inside of the metal tube is performed in this order.
The adhesive layer is composed of a composition material similar to that of the thermoplastic inner layer.
In the bonding process,
An inner layer extrusion process that extrudes a resin inner layer to a predetermined thickness,
An adhesive layer extrusion step of extruding an adhesive layer on the outer peripheral surface of the inner layer body,
A metal tube forming step of forming a metal tube on the outer peripheral surface of the adhesive layer,
The heating and bonding step of heating at a predetermined temperature to integrate the inner layer body and the metal tube via the bonding layer is performed in this order.
The pressure-melted adhesive layer has an anchor effect and
With an electromagnetic shield tube that forms the outer diameter of the metal tube to be 25 times or more and 100 times or less the wall thickness of the metal tube, and forms the adhesive strength between the metal tube and the inner layer body by the adhesive layer to 3 MPa or more. How to manufacture electric wires. The method for manufacturing an electric wire with an electromagnetic shield tube according to claim 7 , wherein after the bonding step and the insertion step, a bending process is performed in which the electric wire with an electromagnetic shield tube is bent according to the arrangement of the electric wire.

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