JP2005149963A - Shielding sleeve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible shielding sleeve that surely shields a wire. <P>SOLUTION: The shielding sleeve comprises a narrow width conductive thin film, laterally wound in the periphery of an elastic core member or a cylindrically braided sleeve made by braiding shielding wires. The elastic core member is preferably composed of polyurethane or rubber. The shielding sleeve has superior flexibility and shield property so that the shielding sleeve comprises a knit and set shield wire, whose periphery is covered with a conductive thin film. The shielding sleeve itself has elasticity so that the shielded wire has elasticity. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a shield sleeve, and more particularly to a shield sleeve suitable for electromagnetic shielding of electric wires used in vehicle wire harnesses, electrical / electronic devices, robots, and the like.

  In recent years, many electric and electronic devices have been used mainly in automobiles, etc. When electric signals including noise signals due to electromagnetic waves are input into these electric and electronic devices, troubles such as malfunctions may occur. Are known. A large number of motors are also used, and these are conversely a source of noise and are known to cause malfunctions such as malfunctions in electrical and electronic equipment. For this reason, the electric wires responsible for the connection between these electric and electronic devices are required to have a shielding performance in order to prevent interference caused by electromagnetic waves.

  As shown in FIG. 9, the electric wire having the shielding performance includes core wires 100a and 100b for inputting and outputting signals, and a mesh-like metal element is provided outside the insulating inner sheath 101 covering the core wires 100a and 100b. A shielded electric wire 104 is known in which a braid 102 made of a wire is wound and an outer sheath 103 is coated on the outer side of the braid 102.

  In order to connect the terminal to such a shielded electric wire 104, for example, as shown in FIG. 10A, the jacket 103 is peeled off to take out the braid 102, and the braid 102 is twisted to twist the twisted wire 105. After the shield breaker wire 106 is connected to the stranded wire 105, the terminals 107a, 107b and 107c are crimped to the respective ends of the core wires 100a and 100b and the shield breaker wire 106 by a terminal crimping machine or the like.

  Then, as shown in FIG. 10 (b), the cap 108 is fitted to separate the shield cutoff line 106 and the core wires 100a and 100b, and contact between these is prevented, and then shown in FIG. 10 (c). As described above, the terminals 107a, 107b, and 107c of the core wires 100a and 100b and the shield cutoff line 106 are mounted in the terminal accommodating chamber 110 of the connector 109 (see Patent Document 1).

Japanese Patent Laid-Open No. 10-41020

  However, when connecting a terminal to a shielded electric wire as described above, in order to ensure the safety of the operator when crimping the terminal and not to deteriorate the work efficiency, the outer sheath and the braid of the shielded electric wire are usually braided. It is necessary to remove about 80 to 200 mm.

  Therefore, even if a shielded wire with excellent shielding performance is used, the braid serving as a shield is removed at the end of the shielded wire, and the core wire is exposed. There was a problem that I couldn't.

  Further, since the braid of the shielded electric wire is made of a metal strand, the shielded electric wire using the braid is not flexible or flexible. Therefore, in some cases, unshielded electric wires that give priority to flexibility or flexibility and eliminate the braiding may be used. However, there is a strong demand for shielding such an unshielded electric wire so as not to impair flexibility or flexibility.

  The present invention has been made in view of such circumstances, and a problem to be solved by the present invention is to provide a shield sleeve capable of reliably shielding an electric wire and having excellent flexibility or flexibility. .

  In order to solve the above-described problems, the shield sleeve according to the present invention is formed by braiding a shield wire formed by horizontally winding a thin conductive foil-like member on the outer periphery of an elastic core material into a tubular shape. To do.

  When the conductive foil member is horizontally wound around the elastic core member, a gap having a width shorter than the width of the conductive foil member is formed in the shield wire so that the conductive foil member does not overlap. It is preferable.

  The gist of the shield sleeve according to the present invention is that a shield wire formed by braiding a thin conductive foil-like member on the outer periphery of an elastic core is braided into a cylindrical shape.

  In the shield sleeve according to the present invention, the elastic core member is preferably made of polyurethane or rubber.

  Since the shield sleeve according to the present invention is formed by braiding a shield wire in which the outer periphery of the elastic core member is covered with a conductive foil-like member, the shield sleeve has both flexibility or flexibility and shielding performance.

  Moreover, since the said shield strand has a stretching property, the shielding sleeve itself which concerns on this invention also has a stretching property. Therefore, the sleeve diameter can be increased, and the shield including the connector as well as the electric wire can be reliably shielded. Further, the electric wire can be easily drawn into the sleeve. Moreover, since it does not depend on the magnitude | size of the diameter of the electric wire to shield, it is easy to adapt to an electric wire. Furthermore, it is excellent in flexibility and flexibility.

  In addition, when the conductive foil-shaped member is horizontally wound around the elastic core member, if a gap having a width shorter than the width of the conductive foil-shaped member is formed so that the conductive foil-shaped member does not overlap, it is further possible. Excellent flexibility or flexibility.

  Hereinafter, a shield sleeve according to the present embodiment (hereinafter also referred to as “the present shield sleeve”) will be described in detail with reference to the drawings.

  FIG. 1 is a view schematically showing the shield sleeve, and FIG. 2 is an enlarged view of the shield sleeve.

  As shown in FIGS. 1 and 2, this shield sleeve 10 basically uses a known braiding device such as a braider, and braids a filamentary shield wire 11 or a shield wire 12 to be described later into a tubular shape. Is formed.

  In the shield sleeve 10, the sleeve diameter is not particularly limited, and is arbitrarily determined in consideration of the number of electric wires inserted into the cylinder, the electric wire diameter, the size of the connector, and the like. Further, the length of the shield sleeve in the longitudinal direction is not particularly limited, and is arbitrarily determined in consideration of the length of the electric wire inserted into the cylinder.

  FIG. 3 is a diagram schematically showing a shield wire constituting the shield sleeve.

  In FIG. 3, the shield wire 11 is formed by horizontally winding a conductive foil-like member 14 on the outer periphery of an elastic core member 13.

  Here, when the conductive foil-like member 14 is horizontally wound around the elastic core member 13, it is preferable that the conductive foil-like member 14 is horizontally wound so that a gap 15 having a width shorter than the width of the conductive foil-like member 14 is formed. If the gap 15 becomes too narrow, the conductive foil members 14 tend to overlap and the flexibility or bendability of the shield wire 11 tends to deteriorate, and if the gap 15 is too wide, the shielding performance tends to be impaired. Because there is. In addition, the horizontal winding may be any of right-handed winding and left-handed winding, and is not particularly limited.

  The elastic core member 13 is an elastic body formed in a thread shape and does not have electrical conductivity. Specific examples of the material of the elastic core member 13 include elastic materials such as polyamide fibers such as polyurethane, rubber, and nylon, aramid fibers, acrylic fibers, and polyester fibers. Preferably, polyurethane is suitably used from the viewpoint of excellent stretchability and heat resistance.

  The thickness of the elastic core member 13 is preferably in the range of 500 to 1000 denier. This is because if the thickness of the elastic core material 13 is thinner than 500 denier, the flexibility tends to be lacking, and if it is thicker than 1000 denier, the shield sleeve tends to be thick, stiff, and lacking in flexibility.

  The conductive foil member 14 is formed by forming a conductive member into a foil shape and having a narrow width. Specific examples of the conductive member include copper, tin-plated copper, nickel-plated copper, nickel-containing copper alloy, and silver-containing copper alloy.

  The thickness of the conductive foil member 14 is preferably in the range of 21 to 49 μm. If the thickness of the conductive foil-like member 14 is less than 21 μm, there is a tendency that the strength during horizontal winding and the shielding performance are lowered, and if it is thicker than 49 μm, the flexibility tends to be lacking. It is.

  The width of the conductive foil member 14 is preferably in the range of 0.1 to 0.6 mm. This is because when the width of the conductive foil-like member 14 is smaller than 0.1 mm, there is a tendency that the lateral winding cannot be performed, and when it is larger than 0.6 mm, flexibility tends to be lacking.

  FIG. 4 is a view schematically showing another shield wire constituting the shield sleeve.

  The shield strand 12 is different from the shield strand 11 in that a conductive foil-like member 14 is formed on the outer periphery of the elastic core member 13. Basically, the same member 14 as the shield wire 11 is used.

  Further, in manufacturing the shield wires 11 and 12, in order to horizontally wind the conductive foil-like member 14 around the elastic core material 13 or braid, so as not to lose the tension of the lateral winding or braid. Preferably, the elastic core member 13 is stretched under a predetermined tension. Further, when the elastic core member 13 is stretched by applying tension, the diameter of the elastic core member 13 is reduced. The balance between the thin elastic core member 13 and the thickness and width of the conductive foil member 14 is balanced. It is preferable to adjust the flexibility or flexibility. Further, when the conductive foil-like member 14 is wound horizontally or braided on the elastic core member 13 and then wound, it is preferably wound with a reduced tension.

  Next, a method for shielding the terminal portion of the shielded electric wire 16 using the shield sleeve 10 will be described. In the following description, the mating connector direction is assumed to be the front.

  FIG. 5 shows a view in which a shielded electric wire subjected to terminal processing is connected to a connector. As shown in FIG. 5, the shielded electric wire 16 is a two-core type shielded electric wire provided with core wires 17 a and 17 b, and the outer sheath 18 is stripped about 80 to 200 mm, and the taken out braid 19 is twisted. Then, it is inverted on the surface of the rear envelope 18.

  Further, terminals (not shown) are pressure-bonded (pressure-contacted) to the tips of the core wires 17a and 17b, and are mounted in a terminal accommodating chamber (not shown) of the connector 20 made of resin. The shielded electric wire 16 is a two-core type, but a multi-core type other than one, three or two cores may be used. Moreover, although the resin thing is used as the connector 20, you may use a shield connector.

  FIG. 6 is a view showing a state in which the end portion of the shielded wire shown in FIG. 5 is shielded by the shield sleeve. Specifically, the shield sleeve 10 is cut into an appropriate length, and then the shield sleeve 10 is inserted into the shield electric wire 16. Next, the rear end of the shield sleeve 10 is brought into conductive contact with the braid 19 of the shield electric wire 16, and the diameter of the front end of the shield sleeve 10 is increased by utilizing the stretchability of the shield sleeve 10. Cover the front edge. Next, the shield sleeve 10 and the connector 20 are fixed by the stopper 21, and the shield sleeve 10 and the shielded electric wire 16 are fixed by the stopper 22.

  As a result, the exposed portion 23 of the shielded electric wire 16 is covered with the shield sleeve 10 and reliably shielded. Further, when the resin connector 20 is used, it has been difficult in the past to easily shield the connector 20 portion. However, according to the above, since the outer periphery of the connector 20 can be covered completely with the shield sleeve 10, the connector 20. Even if it is not a shield connector, it can be shielded in a form including the connector 20. Even if the length of the shield sleeve 10 is shorter than the length of the exposed portion 23, the shield sleeve 10 is stretchable. The exposed portion 23 and the connector 20 can be covered.

  Next, a method for shielding the unshielded electric wires 24a and 24b using the shield sleeve 10 will be described.

  FIG. 7 shows a diagram in which a terminal-treated unshielded electric wire is connected to a connector. As shown in FIG. 7, the terminals (not shown) of the unshielded electric wires 24a and 24b are crimped (pressure-contacted) to the tips of the unshielded electric wires 24a and 24b, and are mounted in the terminal accommodating chamber (not shown) of the resin connector 20. . In the figure, two unshielded electric wires 24a and 24b are used, but a plurality of wires other than one, three, or two may be used. Moreover, although the resin thing is used as the connector 20, you may use a shield connector.

  FIG. 8 is a view showing a state where the unshielded electric wire shown in FIG. 7 is shielded by the shield sleeve. Specifically, after the shield sleeve 10 is cut to an appropriate length, the shield sleeve 10 is inserted into the unshielded electric wires 24a and 24b. Next, the front end of the shield sleeve 10 is expanded using the stretchability of the shield sleeve 10, and the shield sleeve 10 is covered from the rear end to the front end of the connector 20. Next, the shield sleeve 10 and the connector 20 are fixed by the stopper 25.

  Thereby, since it can cover with this shield sleeve 10 in the form including not only the whole unshielded electric wires 24a and 24b but the connector 20, it shields reliably.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the case where the shield sleeve is formed using the shield strand 11 and the shield strand 12 has been described, but the shield strand 11 and the shield strand 12 are mixed in addition to the above. The shield sleeve may be formed to be not particularly limited.

Next, the shield sleeve according to the present invention will be described based on examples.
840 denier polyurethane fiber was stretched approximately 3 times, and a tin-plated copper foil with a foil thickness of 0.035 mm and a foil width of 0.3 mm was horizontally wound 1950 times per 1 m of polyurethane fiber, wound with reduced tension, and shielded I got a strand. In addition, the polyurethane fiber used for this shield strand 10cm was about 4.5cm, and the tin plating copper foil was about 19cm. Moreover, the expansion / contraction rate of the obtained shield strand was about 30 to 90%.

  Next, this shield wire was braided into a cylindrical shape with a number of 7 and a number of strikes of 24 using a braiding device to obtain a cylindrical shield sleeve having an inner diameter of about 10 cm.

It is the figure which showed typically the shield sleeve which concerns on one Embodiment of this invention. It is the figure which expanded the shield sleeve which concerns on one Embodiment of this invention. It is the figure which showed typically the shield strand which comprises the shield sleeve which concerns on one Embodiment of this invention. It is the figure which showed typically the other shield strand which comprises the shield sleeve which concerns on one Embodiment of this invention. It is the figure which showed a mode that the shield electric wire by which the terminal process was carried out was connected to the connector. It is the figure which showed a mode that the terminal part of the shield wire shown in FIG. 5 was shielded with the shield sleeve which concerns on one Embodiment of this invention. It is the figure which showed a mode that the non-shielded electric wire by which the terminal process was carried out was connected to the connector. It is the figure which showed a mode that the unshielded electric wire shown in FIG. 7 was shielded with the shield sleeve which concerns on one Embodiment of this invention. It is the figure which showed the internal structure of the shield wire known conventionally. It is the figure which showed a mode that the terminal crimped | bonded to the core wire was mounted | worn in the terminal storage chamber of a connector in the state in which the core wire of the shielded electric wire was exposed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Shield sleeve 11 Shield wire 12 Shield wire 13 Elastic core material 14 Conductive foil-like member 15 Clearance 16 Shielded wire 17a Core wire 17b Core wire 18 Jacket 19 Braided 20 Connector 21 Fastener 22 Fastener 23 Exposed portion 24a Unshielded wire 24b Unshielded electric wire 25 Fastener

Claims (4)

  A shield sleeve comprising a shield wire formed by horizontally winding a thin conductive foil-like member on an outer periphery of an elastic core material, and braided into a cylindrical shape.   2. The shield sleeve according to claim 1, wherein a gap having a width shorter than a width of the conductive foil-like member is formed in the shield wire so that the conductive foil-like member does not overlap. .   A shield sleeve comprising a shield wire formed by braiding a thin conductive foil-like member on an outer periphery of an elastic core material, and braided into a cylindrical shape.   The shield sleeve according to claim 1, wherein the elastic core member is made of polyurethane or rubber.

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