JP2017033738A - Jumper cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jumper cable with flexibility which can satisfy appointed standard for a long term even if the cable receives repeated flexing.SOLUTION: A jumper cable 1 comprises: multiple insulated wires 4 in which the periphery of a conductor 2 is coated with an insulator 3 with Shore A hardness of 70 or more and 90 or less; and a sheath 8 which is provided around the multiple insulated wires 4 and has the Shore A hardness of lower than that of the insulator 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a jumper wire.

  Jumper wires used for movable parts as twisted pair cables for LANs place importance on flexibility, so the insulator covering the conductor, the central inclusion, and the outermost sheath are made of a relatively soft material. (For example, refer to Patent Document 1).

  In the twisted pair cable described in Patent Document 1, a pair of core wires are formed by twisting two core wires in which a compression twisted wire conductor is covered with a foamed cross-linked polyethylene and a non-foamed layer. Two pairs are twisted together with inclusions interposed between them, and a sheath made of polyvinyl chloride resin is provided on the outermost layer.

JP 2009-230911 A

  However, in the conventional twisted pair cable, since the insulator is made of a relatively soft material, when the cable is bent, the distance between the conductors changes due to the change in the thickness of the insulator, resulting in transmission characteristics. May decrease. For example, a twisted pair cable used for a crossover between railway vehicles is required to have the characteristics of the standard (CAT5E: enhanced category 5) by the American Telecommunications Industry Association (TIA) and the Electronic Industries Association of America (EIA). With twisted pair cables, it is difficult to satisfy the characteristics of the standard.

  Accordingly, an object of the present invention is to provide a jumper wire having a bending resistance capable of satisfying a predetermined standard over a long period of time even when subjected to repeated bending.

[1] A plurality of insulated wires whose outer periphery of the conductor is coated with an insulator having a Shore A hardness of 70 to 90, and an outer periphery of the plurality of insulated wires, and the Shore A hardness is greater than the Shore A hardness of the insulator. Jumper wire with a lower sheath.
[2] The jumper wire according to [1], wherein the insulator of the insulated wire is made of polyethylene.
[3] The conductor according to [1] or [2], wherein the conductor includes a plurality of tension members arranged in the center and a plurality of conductive wires arranged in a twisted manner around the plurality of tension members without being compressed. Jumper wire as described in
[4] The jumper wire according to [3], wherein a ratio (P / PD) of a twisted pitch (P) and a twisted outer diameter (PD) of the conductor is 15 to 20.

  ADVANTAGE OF THE INVENTION According to this invention, even if it receives repeated bending, the jumper wire provided with the bending resistance which can satisfy a predetermined standard over a long term can be provided.

FIG. 1 is a cross-sectional view of a jumper line according to an embodiment of the present invention. FIG. 2 is a partially enlarged view showing details of a conductor of the jumper wire shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, about the component which has the substantially same function, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

[Embodiment]
FIG. 1 is a cross-sectional view of a jumper line according to an embodiment of the present invention.

  The jumper wire 1 includes a plurality of insulated wires 4 in which the outer periphery of the conductor 2 is covered with an insulator 3 and a pressing tape 6 wound around the centers and the periphery of the plurality of insulated wires 4 with inclusions 5A and 5B interposed therebetween. The shield layer 7 provided on the outer periphery of the pressing tape 6 and the sheath 8 provided on the outer periphery of the shield layer 7 are provided.

  The plurality of insulated wires 4 are arranged in a twisted manner. The insulated wire 4 transmits a signal of 1 MHz to 100 MHz, for example. As the insulated wire 4, one set or two or more sets of twisted pair wires that transmit differential signals may be used. This embodiment shows two sets of twisted pair wires. The configuration of the conductor 2 will be described later.

  As a material of the insulator 3 of the insulated wire 4, a material having a Shore A hardness of 70 or more and 90 or less, for example, non-foamed polyethylene, fluorine resin or the like can be used.

  As the pressing tape 6, for example, a resin tape made of a resin such as polyethylene terephthalate (PET) or polypropylene resin can be used.

  The shield layer 7 is formed, for example, by braiding a conducting wire and connected to the ground. The shield layer 7 may be one in which a tape with a conductor is wound.

  As the material of the sheath 8, a material having a Shore A hardness lower than that of the insulator 3, such as a polyolefin elastomer and chloroprene can be used.

  As the central inclusion 5A, a material having a Shore A hardness of 70 to 90, such as polyethylene, can be used. For the inclusion 5B arranged around, a general material such as glass fiber can be used, for example.

(Construction of conductor)
FIG. 2 is a sectional view showing a detailed configuration example of the conductor 2 of the insulated wire 4 of the jumper wire 1 shown in FIG. The conductor 2 includes a plurality of (for example, three) tension members (high tension wires) 20 disposed at the center and a plurality of conductors 21 disposed around the tension member 20 without being compressed and twisted together.

  As the tension member 20, for example, a high-tensile steel wire (for example, a piano wire), a steel wire, a fiber reinforced plastic (FRP) wire, or the like can be used. Of these wires, a piano wire having a high tensile strength is preferable. The plurality of tension members 20 are twisted and arranged. Thereby, bending resistance improves.

  For example, a tinned annealed copper wire can be used as the conductive wire 21. The ratio (P / PD) of the twisting pitch (P) and the twisting outer diameter (PD) of the conductor 21 is preferably in the range of 15-20. The reason why the P / PD is set to 15 or more is that if it is less than 15, the transmission characteristics (for example, characteristic impedance) may not satisfy the CAT5E standard. The reason why P / PD is set to 20 or less is that when it exceeds 20, the kink resistance rapidly decreases.

(Operation and effect of the present embodiment)
According to the present embodiment, the following operations and effects are achieved.
(1) Since the insulator 3 of the insulated wire 4 is formed from a material having a relatively high hardness and the sheath 8 is formed from a material having a relatively low hardness, the insulator is used even when the cable is used in a portion where bending is applied. Therefore, the accuracy of the distance between the conductors 2 can be improved, and the deterioration of transmission characteristics can be suppressed.
(2) Since the pitch of the conducting wire 21 is set to an optimum value, the cross-sectional shape of the conductor 2 becomes close to a perfect circle, and the transmission characteristics of the CAT5E standard can be satisfied.
(3) Since the tension member 20 is disposed at the center of the conductor 2, even if subjected to repeated bending, bending resistance capable of satisfying the CAT5E standard for a long time can be obtained.
(4) The jumper wire 1 can be used as a LAN cable in a portion that repeatedly undergoes bending, for example, a connecting wire between railway vehicles.

  Next, examples of the present invention will be described. This example corresponds to the above embodiment. In this example, polyethylene was used for the insulator 3 and polyethylene was used for the central inclusion 5A. Moreover, the tension member 20 which comprises the conductor 2 of the insulated wire 4 used the piano wire with an outer diameter of 0.26 mm. Moreover, the conducting wire 21 arrange | positioned 12 tin plating annealed copper wires with an outer diameter of 0.18 mm in the inner layer, and 18 in the outer layer. The twisting pitch of the conducting wire 21 was 20 mm, and P / PD was 17. As a result, the characteristic impedance was 85 to 115Ω (1 MHz to 100 MHz).

The embodiments of the present invention are not limited to the above-described embodiments, and various embodiments are possible.

  Further, it is possible to omit or change some of the constituent elements of the above-described embodiment within a range not changing the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Jumper wire, 2 ... Conductor, 3 ... Insulator, 4 ... Insulated electric wire, 5A, 5B ... Inclusion,
6 ... Pressing tape, 7 ... Shield layer, 8 ... Sheath, 20 ... Tension member,
21 ... Conductor

Claims (4)

A plurality of insulated wires in which the outer periphery of the conductor is coated with an insulator having a Shore A hardness of 70 to 90,
A sheath provided on the outer periphery of the plurality of insulated wires and having a Shore A hardness lower than the Shore A hardness of the insulator;
Jumper wire with The insulator of the insulated wire is formed from polyethylene,
The jumper wire according to claim 1.   3. The jumper wire according to claim 1, wherein the conductor includes a plurality of tension members arranged at a center and a plurality of conductors arranged to be twisted around the plurality of tension members without being compressed.   4. The jumper wire according to claim 3, wherein a ratio (P / PD) of a twist pitch (P) and a twist outer diameter (PD) of the conductor is 15 to 20.

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