JP7228105B2 - Communication cable for moving part - Google Patents

Description

The present invention relates to a communication cable for movable parts.

2. Description of the Related Art Conventionally, jumper wires for communication that connect railway vehicles are known (see, for example, Patent Document 1). In a communication cable for a movable part used as such a jumper wire, a tension member is used in which metal wires such as steel wires are twisted together in order to suppress the load applied to the signal wire.

JP 2004-173127 A

With the increase in communication capacity in recent years, there is a demand for communication cables for movable parts that are compatible with high-speed communication such as 1 Gbps. In order to support high-speed communication, even if a tension member made of twisted metal wires is used, the communication cable for moving parts suppresses the influence of the tension member on communication and achieves stable transmission characteristics. is required.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a communication cable for a movable part that is capable of obtaining stable transmission characteristics in high-speed communication even when a tension member made of twisted metal wires is used.

In order to solve the above problems, the present invention has a tension member provided at the center of a cable and configured by twisting a plurality of metal wires together, and an insulator covering the circumference of the tension member. A tension member unit, a plurality of twisted pair wires formed by twisting a pair of insulated wires, and a cable core formed by twisting the plurality of twisted pair wires around the tension member unit are provided to cover the periphery of the cable core. Provided is a communication cable for a movable part, comprising a shield layer and a sheath covering the shield layer.

According to the present invention, it is possible to provide a communication cable for a movable part that can obtain stable transmission characteristics in high-speed communication even when a tension member made of twisted metal wires is used.

1 is a cross-sectional view showing a cross section perpendicular to the longitudinal direction of a communication cable for movable parts according to an embodiment of the present invention; FIG. It is a figure explaining a shield layer.

[Embodiment]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing a cross section perpendicular to the longitudinal direction of the communication cable for movable parts according to the present embodiment. The movable part communication cable 1 is, for example, a jumper wire for communication connecting between railroad vehicles. Not limited to this, the movable section communication cable 1 may be wired across the movable section and the swing section in, for example, an industrial robot or the like.

As shown in FIG. 1, a movable section communication cable 1 includes a tension member unit 2 provided at the center of the cable, a plurality of twisted pair wires 3 and intervening wires 4 twisted around the tension member unit 2, and a tension member A shield layer 6 provided so as to cover the periphery of a cable core 5 in which a plurality of twisted pairs 3 and intervening wires 4 are twisted around a unit 2, and a sheath 7 provided so as to cover the periphery of the shield layer 6. , is equipped with

(Tension member unit 2)
The tension member unit 2 is provided at the center of the cable and has a tension member 21 formed by twisting a plurality of metal wires and an insulator 22 covering the circumference of the tension member 21. - 特許庁

The tension member 21 bears a tensile force so as not to apply a load to the twisted pair wire 3 when the movable section communication cable 1 is installed between railroad cars or the like. As the metal wire used for the tension member 21, for example, a high tension steel wire such as a piano wire or a steel wire can be used. By twisting a plurality of metal wires together, it is possible to improve the tensile strength and bending resistance of the tension member 21 . In this embodiment, the tension member 21 is constructed by twisting three piano wires with high tensile strength.

The insulator 22 separates the twisted pair 3 and the tension member 21 to prevent the tension member 21 from affecting the transmission characteristics, and also serves to keep the outer diameter of the cable circular. 3 and fill the space surrounded by each interposition 4 . Further, the tension member 21 is deformed according to the bending when the movable section communication cable 1 is bent, and also serves as a cushioning material that reduces the load applied to each twisted pair wire 3 . The outer diameter of the insulator 22 is larger than the outer diameter of the twisted wire pair 3 and the intervening wire 4 .

The insulator 22 may be made of a rubber-based material, such as polyolefin elastomer or chloroprene. Note that the insulator 22 is not limited to a rubber-based material, and can be made of, for example, PE (polyethylene) or the like.

(Twisted pair wire 3)
The twisted wire pair 3 is used for transmitting differential signals, and is configured by twisting a pair of insulated wires 31 together. In this embodiment, four twisted pair wires 3 are used, and a total of eight insulated wires 31 are used. Note that the number of twisted pair wires 3 used in the communication cable 1 for movable part is not limited to this. The insulated wire 31 has a conductor 311 made of a twisted conductor made by twisting metal wires made of tin-plated annealed copper wires or the like, and an insulator 312 covering the conductor 311 . As the insulator 312, for example, one made of polyethylene or fluorine resin can be used.

In order to suppress crosstalk between the twisted wire pairs 3, the twist pitches of the twisted wire pairs 3 are preferably set differently. Here, the twist pitch of the twisted pair wire 3 is the distance along the longitudinal direction of the twisted pair wire 3 at which the positions of the arbitrary insulated wires 31 in the circumferential direction are the same. Further, the twisting direction of each twisted pair wire 3 is the same direction. Here, the twist direction of the twisted pair wire 3 is the direction in which the insulated wire 31 rotates from the other end to the one end when viewed from one end of the twisted pair wire 3 .

(Intervention 4)
The interposition 4 plays a role of separating the twisted pair wires 3 to suppress crosstalk between the twisted pair wires 3, and a role of making the external shape of the communication cable 1 for a movable part closer to a circular shape. The intervention 4 is made of an insulating resin such as polyethylene. Interpositions 4 are arranged between twisted pair wires 3 adjacent in the circumferential direction. In other words, the interpositions 4 are arranged so as to sandwich each twisted pair wire 3 in the circumferential direction.

The interposition 4 is formed in a linear shape having a circular cross section perpendicular to the longitudinal direction, and the outer diameter of the interposition 4 is equal to the outer diameter of the twisted pair wire 3 (twice the outer diameter of the insulated wire 31). It is set to be approximately equal. More specifically, the outer diameter of the intervention 4 is preferably 90% or more and 110% or less of the outer diameter of the twisted pair wire 3 . As a result, the outer diameter of the movable section communication cable 1 can be made closer to a circular shape, and a good appearance can be obtained. Although the interposition 4 is solidly formed here, the interposition 4 may be tubular.

(Cable core 5)
In the cable core 5, a plurality of twisted pair wires 3 and a plurality of intervening wires 4 are helically twisted around the tension member unit 2 so that the twisted pair wires 3 and interposed interposers 4 are alternately arranged in the circumferential direction. configured together. In order to prevent the twisting of the twisted pair 3 from becoming unstable and adversely affecting the transmission characteristics when the twisted pair 3 and the intervening wire 4 are twisted together, the twisting direction of the cable core 5 is the same as the twisting direction of the twisted pair 3. preferably in the same direction. By making the twisting direction of the cable core 5 and the twisting direction of the twisted pair wire 3 the same direction, it is also possible to improve flexibility of the communication cable 1 for the movable part. Here, the twisting direction of the cable core 5 is the direction in which the twisted wire pair 3 and the interposition 4 rotate from the other end to the one end of the cable core 5 when viewed from one end.

In addition, in order to suppress a load from being applied to the twisted pair 3 when the twisted pair 3 and the intermediate 4 are twisted together, the twist pitch of the cable core 5 is set equal to or greater than the twist pitch of the twisted pair 3 (each twisted pair 3 twist pitches or more). Here, the twist pitch of the cable core 5 is the distance along the longitudinal direction of the twisted wire pairs 3 at which the positions of the arbitrary twisted wire pairs 3 or intervening wires 4 are the same in the circumferential direction.

In this embodiment, four twisted pair wires 3 and four intervening wires 4 are used. are placed in Therefore, in a cross section perpendicular to the longitudinal direction of the cable, a square is drawn by connecting the center positions of the four twisted pair wires 3 . In other words, the four twisted pairs 3 are arranged so that the central position is located at the vertex of the square in the cross section perpendicular to the longitudinal direction of the cable. Similarly, in a section perpendicular to the longitudinal direction of the cable, a square is drawn by connecting the center positions of the four interventions 4 .

(Holding winding tape 8 and holding sheath 9)
Around the cable core 5, a pressing winding tape 8 is helically wound to hold the twisted pair of wires 3 and the intervening wire 4 and maintain their shape. The pressing tape 8 is made of a resin tape such as PET (polyethylene terephthalate). Each twisted wire pair 3 is in contact with two intermediates 4 adjacent to the twisted wire pair 3 in the circumferential direction, the outer surface of the tension member unit 2 (the outer surface of the insulator 22 ), and the inner surface of the pressure winding tape 8 . Each interposition 4 is in contact with two twisted wire pairs 3 adjacent to the interposition 4 in the circumferential direction, the outer surface of the tension member unit 2 (the outer surface of the insulator 22 ), and the inner surface of the pressure winding tape 8 .

In order to prevent the winding tape 8 from unraveling during cable manufacture, the circumference of the winding tape 8 is covered with a restraining sheath 9. - 特許庁The pressing sheath 9 is made of an insulating resin such as polyethylene. The hold-down sheath 9 is preferably formed to have a thickness sufficient to hold the hold-down tape 8, and is formed thinner than an inner sheath 71 and an outer sheath 73, which will be described later.

(Shield layer 6)
The shield layer 6 is for shielding noise from the outside, and is provided so as to cover the periphery of the cable core 5 . In this embodiment, a braided shield layer 62 is used as the shield layer 6 in order to improve flexibility. However, since the braided shield layer 62 alone may not provide sufficient shielding performance, the first metal tape layer 61 further wound with a metal tape is used in order to improve the shielding performance. Furthermore, in order to improve bending durability, the shield layer 6 has a three-layer structure in which a braided shield layer 62 is sandwiched between a first metal tape layer 61 and a second metal tape layer 63 . Thus, in this embodiment, the shield layer 6 is constructed by sequentially providing the first metal tape layer 61 , the braided shield layer 62 and the second metal tape layer 63 around the pressing sheath 9 .

As shown in FIG. 2, the first metal tape layer 61 is made of a metal tape having a first metal layer 611 provided on one surface of a first resin tape 612. (upper side in FIG. 2) is spirally wound around the cable core 5 (here, around the holding sheath 9). As the metal tape used for the first metal tape layer 61, for example, a first metal layer 611 made of aluminum is provided on one surface of a first resin tape 612 made of PET, and an aluminum tape that is lightweight and easy to handle. (tape with aluminum foil) can be used.

The braided shield layer 62 is provided around the first metal tape layer 61 so as to be in contact with the first metal layer 611 . In the present embodiment, the braided shield layer 62 is composed of a mixed braided shield in which metal wires made of metal and resin wires made of resin are woven together. Here, as the braided shield layer 62, a mixed braided shield in which tin-plated annealed copper wires and staple fiber yarns (staple fiber yarns) are woven together is used. By configuring the braided shield layer 62 with a mixed braided shield, it is possible to reduce the weight and improve flexibility of the communication cable 1 for the movable section.

The second metal tape layer 63 is made of a metal tape in which the second metal layer 631 is provided on one surface of the second resin tape 632, and the metal tape is placed so that the second metal layer 631 is inside (lower side in FIG. 2). It is wound around the braided shield layer 62 so as to be in contact with the adjacent braided shield layer 62 . As the metal tape used for the second metal tape layer 63, for example, a second metal layer 631 made of aluminum is provided on one surface of a second resin tape 632 made of PET, and an aluminum tape that is lightweight and easy to handle. (tape with aluminum foil) can be used. Although aluminum tapes having the same structure are used for the first metal tape layer 61 and the second metal tape layer 63 here, different metal tapes may be used.

By sandwiching the braided shield layer 62 between the metal tape layers 61 and 63, the electrical resistance of the shield layer 6 can be reduced and the shielding ability can be improved. In addition, even if the communication cable 1 for a movable part is repeatedly bent, the braided shield layer 62 is sandwiched between the metal tape layers 61 and 63. It is possible to suppress the influence of abrasion of the metal layers 611 and 631 due to sliding and improve bending durability.

(Sheath 7)
The sheath 7 covers the shield layer 6 and serves to protect the shield layer 6 and the cable core 5 . In this embodiment, the sheath 7 has a two-layer structure with a resin tape 72 interposed therebetween so that the sheath 7 can be easily peeled off so as to correspond to the structure of the connector when the terminal is processed. More specifically, the sheath 7 includes an inner sheath 71 covering the circumference of the shield layer 6, a resin tape 72 wound around the inner sheath 71, and an outer sheath covering the circumference of the resin tape 72. a sheath 73;

The inner sheath 71 and the outer sheath 73 are made of the same material. As the inner sheath 71 and the outer sheath 73, polyolefin elastomer or a rubber material such as chloroprene can be used. The resin tape 72 is made of PET, PP, or the like, for example. The outer diameter of the sheath 7 (that is, the outer diameter of the movable section communication cable 1) is, for example, about 17 mm.

(Actions and effects of the embodiment)
As described above, in the movable section communication cable 1 according to the present embodiment, the tension member 21 is provided at the center of the cable and configured by twisting a plurality of metal wires, and the tension member 21 is covered with a tension member unit 2 having an insulator 22, a plurality of twisted wire pairs 3 formed by twisting a pair of insulated wires 31, and a plurality of twisted wire pairs 3 twisted around the tension member unit 2. A shield layer 6 provided to cover the periphery of a cable core 5 and a sheath 7 covering the periphery of the shield layer 6 are provided.

By arranging the tension member 21 in the center of the cable and providing an insulator 22 around the tension member 21, the tension member 21 is separated from the twisted pair wire 3, and the tension member 21 affects transmission characteristics. can be suppressed, and stable transmission characteristics can be obtained in high-speed communication. As a result, a communication cable 1 for moving parts compatible with 1 Gbps high-speed communication required in Category 6 specified by the Telecommunications Industry Association of America (TIA), the Electronics Industry Association of America (EIA), and the International Electrotechnical Commission (IEC) can be realized.

(Summary of embodiment)
Next, technical ideas understood from the embodiments described above will be described with reference to the reference numerals and the like in the embodiments. However, each reference numeral and the like in the following description do not limit the constituent elements in the claims to the members and the like specifically shown in the embodiment.

[1] A tension member having a tension member (21) provided at the center of the cable and configured by twisting a plurality of metal wires together, and an insulator (22) covering the circumference of the tension member (21). A unit (2), a plurality of twisted pair wires (3) formed by twisting a pair of insulated wires (31), and a plurality of said twisted pair wires (3) twisted around said tension member unit (2). and a sheath (7) covering the circumference of the shield layer (6). Cable (1).

[2] A plurality of linear interpositions (4) are provided, and the cable core (5) is arranged such that the twisted pair wires (3) and the interpositions (4) are alternately arranged in the circumferential direction. The movable part communication cable (1) according to [1], which is configured by twisting a plurality of the twisted pair wires (3) and a plurality of the intervening wires (4) around the tension member unit (2). ).

[3] The communication cable for movable part (1) according to [2], wherein the outer diameter of the intervention (4) is 90% or more and 110% or less of the outer diameter of the twisted pair wire (3).

[4] The shield layer (6) is formed by providing a first metal layer (611) on one surface of a first resin tape (612), and the first metal layer (611) is positioned outside. A first metal tape layer (61) wound around the cable core (5) and a metal tape layer (61) provided around said first metal tape layer (61) in contact with said first metal layer (611) A braided shield layer (62) and a second metal layer (631) provided on one surface of a second resin tape (632), the second metal layer (631) being inside and the braided shield layer (62) a second metal tape layer (63) wrapped around the braided shield layer (62) so as to contact the Communication cable (1).

[5] The communication for moving parts according to [4], wherein the braided shield layer (62) is composed of a mixed braided shield in which metal wires made of metal and resin wires made of resin are woven together. Cable (1).

[6] The sheath (7) includes an inner sheath (71) covering the periphery of the shield layer (6), a resin tape (72) wound around the inner sheath (71), and the An external sheath (73) covering the periphery of the resin tape (72).

[7] A pressure winding tape (8) wound around the cable core (5) and a pressure sheath (9) covering the circumference of the pressure winding tape (8), wherein the shield layer (6 ) is provided so as to cover the periphery of the holding sheath (9), the communication cable for movable parts (1) according to any one of [1] to [6].

Although the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the scope of claims. Also, it should be noted that not all combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

Moreover, the present invention can be modified appropriately without departing from the gist thereof. For example, although the shield layer 6 has a three-layer structure in the above embodiment, it is not limited to this, and may be composed of only one metal tape layer wound with a metal tape, for example.

DESCRIPTION OF SYMBOLS 1... Communication cable for movable part 2... Tension member unit 21... Tension member 22... Insulator 3... Twisted pair wire 31... Insulated wire 4... Interposition 5... Cable core 6... Shield layer 61... First metal tape layer 611... Second First metal layer 612 First resin tape 62 Braided shield layer 63 Second metal tape layer 631 Second metal layer 632 Second resin tape 7 Sheath 71 Inner sheath 72 Resin tape 73 Outer sheath 8 Hold-down tape 9: Hold-down sheath

Claims (6)

a tension member unit provided at the center of the cable and having a tension member configured by twisting a plurality of metal wires; and an insulator covering the circumference of the tension member;
a plurality of twisted pair wires formed by twisting a pair of insulated wires;
a shield layer provided to cover the periphery of a cable core formed by twisting a plurality of the twisted pair wires around the tension member unit;
A sheath covering the periphery of the shield layer ,
The shield layer is
a first metal tape layer having a first metal layer provided on one surface of a first resin tape and wound around the cable core so that the first metal layer faces the outside;
a braided shield layer provided around the first metal tape layer and in contact with the first metal layer;
The second metal tape is provided with a second metal layer on one surface of a second resin tape, and is wound around the braided shield layer so that the second metal layer is on the inside and is in contact with the braided shield layer. having a layer and
Communication cable for moving parts. comprising a plurality of linear interventions,
The cable core is configured by twisting a plurality of the twisted pair wires and a plurality of the interpositions around the tension member unit such that the twisted pair wires and the interpositions are alternately arranged in the circumferential direction. has been
The communication cable for movable parts according to claim 1. The outer diameter of the interposition is 90% or more and 110% or less of the outer diameter of the twisted pair wire.
The communication cable for movable parts according to claim 2. The braided shield layer is composed of a mixed weave braided shield in which metal wires made of metal and resin wires made of resin are woven together,
The communication cable for movable parts according to claim 1 . The sheath is
an inner sheath surrounding the shield layer;
a resin tape wrapped around the inner sheath;
an outer sheath covering the periphery of the resin tape,
The communication cable for movable parts according to any one of claims 1 to 4 . a pressure winding tape wrapped around the cable core;
a holding sheath that covers the periphery of the holding tape,
The shield layer is provided so as to cover the periphery of the holding sheath,
The communication cable for movable parts according to any one of claims 1 to 5 .

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