JP2015049998A - Cable for electric power source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable for electric power sources which enables improvement of bending and twisting resistances of the cable.SOLUTION: In a cable for electric power sources including conductor parts composed of a plurality of metal element wires, a composite conductor part composed of a plurality of the conductor parts twisted together and an insulator, a shield layer and/or an outer layer covering the composite conductor part, among the conductor parts constituting the composite conductor part, at least one conductor part has, on it, a coating-provided conductor part applied with a sliding material. In the coating-provided conductor part, the sliding material is tape winding with a fluororesin, and the winding direction of the tape winding is the same as the twisting direction of the conductor part.

Description

The present invention relates to a power supply cable that is used as a power supply cable and is excellent in bending resistance and twisting resistance suitable for use in a movable part.

  As a conventional power supply cable, a cable in which an insulator is provided on a composite conductor obtained by twisting a plurality of conductors and then twisting them is generally used. Although this structure is simple, it can be manufactured at low cost, but in environments where bending and twisting conditions such as moving parts are severe, loads are concentrated locally in the cable at the bent part, and fatigue breakage of the metal wire is caused. Occur.

  Patent Document 1 includes a composite twisted wire conductor that is excellent in flexibility and has a plurality of strands that are twisted together as a composite twisted wire conductor for energization. A composite stranded wire conductor composed of an assembly stranded wire (5) and a first layer composite stranded wire (11) in which a plurality of first layer assembly stranded wires (9) are twisted around the assembly stranded wire (5). ) Is 8 to 70 times the core diameter of the central assembly strand (5), and the twist pitch of the first layer composite strand (11) is that of the first layer composite strand (11). 8-30 times the layer core diameter, the twist angle of the central assembly strand (5), the twist angle of the first layer assembly strand (9), and the twist angle of the first layer composite strand (11) The difference between the sum and the wire is 15 degrees or less, and the strand is a composite stranded wire conductor made of aluminum or aluminum alloy having an elongation of 2% or more. It has been. However, when used in movable parts, twisted parts, vibrating parts, etc. instead of fixed wiring, conventional power cables are prone to problems, and further improvements in bending resistance and twisting resistance are desired. ing.

JP 2006-156346 A

An object of the present invention is to provide a power supply cable that is further improved in the conventional power supply cable and has excellent bending resistance and twist resistance.

As a result of intensive studies, the inventor has sought to eliminate the problems of conventional bending resistance and twist resistance by applying a sliding material on at least one conductor portion.

The power supply cable provided by the present invention includes a conductor portion obtained by twisting a plurality of metal strands, a composite conductor portion obtained by twisting a plurality of the conductor portions, an insulator and / or on the composite conductor portion. In a power cable coated with a shield layer and / or an outer layer, a coated conductor in which a sliding material is applied on at least one of the plurality of conductor portions constituting the composite conductor portion It has the part.
Further, in the coated conductor portion, the sliding material is tape winding with a fluororesin, and the winding direction of the tape winding is the same direction as the twist direction of the conductor portion.

Further, in the present invention, in the plurality of conductor portions constituting the composite conductor portion, the covered conductor portion to which the sliding material is applied and the conductor portion to which the sliding material is not applied are adjacent to each other. And is twisted in the same direction as the twist direction of the conductor portion.
This is because even if the sliding material is not applied to all the conductor parts, the friction between adjacent conductor parts can be reduced if the sliding material is applied to one of the conductor parts, and the bending resistance and the twisting resistance can be improved. This is to contribute. Also, at the time of bending, in one conductor part that does not have a sliding material, each strand constituting the conductor moves freely and moves to the gap, so that it acts as a cushioning material in the composite conductor part, resulting in bending resistance. In addition, the twisting resistance is improved.

Furthermore, by further unifying the twisting direction of the conductor part and the composite conductor part and the tape winding direction of the sliding material, further improvement in bending resistance and twisting resistance can be expected.

Further, the present invention is characterized in that a restraining sliding material is provided between the composite conductor portion and the insulator. Since the friction between the insulator and the composite conductor portion is reduced by covering the composite conductive portion with the sliding material, further improvement in bending resistance and twist resistance can be expected due to a synergistic effect with the structure.

In the power cable of the present invention, the excellent effects described below can be expected.
(1) By applying a sliding material to the conductors, contact and friction between the conductors is reduced, so fatigue breakage does not occur between the conductors at the time of bending, and bending resistance and twist resistance are improved. improves.
(2) When fluororesin tape winding is applied as a sliding material, by unifying the twisting direction of the conductor part and the composite conductor part and the twisting direction of the tape winding, the twisted wire is twisted back by bending, and the direction of tightening Because they are the same, fatigue disconnection due to wear can be prevented.
(3) The coated conductor portion to which the sliding material is applied and the conductor portion to which the sliding material is not applied are arranged so as to be adjacent to each other, and are twisted in the same direction as the twisting direction of the conductor portion, Inexpensive without giving excessive specifications, and each strand of one conductor part that does not give a sliding material plays a role as a cushioning material, effectively improving the bending resistance and twisting resistance. it can.
(4) By applying a restraining sliding material between the composite conductor portion and the insulator, the friction between the insulator and the composite conductor portion is reduced, and the bending resistance and twist resistance are further improved.

An example of sectional drawing in the cable for power supplies of the present invention is shown. The other example of sectional drawing in the cable for power supplies of this invention is shown. An example of the sectional view in the conventional power cable is shown. The side view of a flexibility test apparatus is shown. The side view of a twist test apparatus is shown.

Hereinafter, the basic configuration of the present invention will be described with reference to the accompanying drawings.
In the power cable 1 of FIGS. 1 and 2, a conductor portion 2 in which a plurality of metal wires are twisted together, a conductor portion 4 with a sheath in which the conductor portion 2 is covered with a sliding material 3, a conductor portion 2 and / or (slip A composite conductor portion 5 in which a plurality of coated conductor portions 4 (covered with a material 3) are twisted together, a buffer material 6 in the center of the composite conductor portion 5, a sliding material 7 for restraining on the composite conductor portion 5, an insulator 8, The shield layer 9 and the outer layer 10 are applied on concentric circles.

  The configuration of the conductor portion 2 is a twisted wire such as a collective twist or a concentric twist. The material is preferably tin-plated annealed copper wire, silver-plated annealed copper wire, or the like. From the viewpoint of bending resistance and twisting resistance, it is preferable that the twisting direction is unified to the composite conductor portion 5 and the like.

  The material of the sliding material 3 is preferably a fluororesin such as PTFE from the viewpoint of sliding properties. Specifically, in order to provide flexibility, the tape winding of the fluororesin is preferable, and the twisting direction of the conductor portion 2 and the tape winding direction of the sliding material 3 are preferably the same. This is because by making the twisting direction and the tape winding direction the same, the friction between the conductor portion 2 and the tape winding overlap (unevenness) of the sliding material 3 is alleviated, and wear of the conductor portion can be prevented.

  A conductor portion 2 and / or a conductor portion 4 with a coating (covered with a sliding material 3) is bundled and twisted and called a composite conductor portion 5. A buffer material 6 is applied to the central portion of the composite conductor portion 5 in order to reduce the impact caused by bending. The direction in which the composite conductor portion 5 is twisted is preferably the same as that of the conductor portion 2.

A restraining structure such as a sliding material 7 may be provided on the composite conductor portion 5. The material of the restraining sliding material 7 is preferably a fluororesin like the sliding material 3, and a tape winding structure is preferable from the viewpoint of flexibility. In that case, the tape winding direction is preferably the same as that of the conductor portion 2 and the composite conductor portion 5.

  An insulator 8 is applied on the composite conductor portion 5 and the restraining sliding material 7. The material of the insulator 8 is not particularly limited, but from the viewpoints of bending resistance and twisting resistance, polyethylene, soft fluororesin, and the like that are excellent in flexibility are preferred.

The structure of the shield layer 9 is not particularly limited, but a braided structure excellent in noise and shielding properties is suitable. Regarding the material, in addition to tin-plated annealed copper wire and silver-plated annealed copper wire, from the viewpoint of bending resistance and twist resistance Therefore, a copper alloy wire is used.

  The material of the outer layer 10 is not particularly limited, but a polyethylene resin, a polyester elastomer, and the like that are excellent in flexibility are preferable from the viewpoints of flex resistance and twist resistance. The thickness and other dimensions are not particularly limited, and are applicable to general cables.

Example 1 which is the aspect of FIG. 1 of the cable 1 for power supplies of this invention is shown.
PTFE fired tape is wound around the conductor part 2, which is a tin-plated annealed copper wire with an outer diameter of 7.3 mm (7/95 / outer diameter of φ0.08 mm, S twist), with S twist as a sliding material 3 The conductor part 4 is produced. Three conductor portions 4 with covering and three conductor portions 2 (not provided with the sliding material 3) are alternately arranged around the buffer material 6 to produce the composite conductor portion 5. On the composite conductor portion 5, as a sliding material 7 made of PTFE tape and an insulator 8, a soft fluororesin is formed by extrusion so as to have a thickness of 0.65 mm and an outer diameter φ8.7 mm. Further, as the braided shield 9, a copper alloy braid was applied at 16 strokes / 8 pieces / outer diameter φ0.24 mm to obtain an outer diameter φ9.9 mm. Finally, a polyester elastomer is applied as an outer layer 10 by extrusion molding to a thickness of 0.75 mm to produce a power cable 1 having an outer diameter of 11.5 mm.

Example 2 which is the aspect of FIG. 2 of the cable 1 for power supplies of this invention is shown.
In the second embodiment, the configuration of the composite conductor portion 5 of the power cable 1 of the first embodiment is the covered conductor portion 4. That is, it consists of a composite conductor portion 5 in which six covered conductor portions 4 are arranged around a buffer material 6.

The cited example 1 is composed of the composite conductor part 5 in which the sliding material 3 is not used at all in the power supply cable 1 of the example 1, and the six conductor parts 2 are arranged around the buffer material 6.

About Example 1, 2 and the cited example 1, the test of bending resistance and twisting resistance was done, and the result is shown in Table 1.

  For reference, a side view of the flexibility test apparatus 11 is shown in FIG. The test condition is that the power supply cable 1 with a load 14 of 1 kg is lightly sandwiched between R50 mm mandrels 12 and bent 90 degrees to the left and right at a speed of 30 times / minute. Bend 90 degrees to the left and right to make one time, and check the number of bendings until complete disconnection and no continuity.

  Further, a side view of the torsional property testing apparatus 15 is shown in FIG. As test conditions, one end of a cable with a load 14 of 500 g is twisted 45 degrees left and right at a speed of 30 times / minute. The distance 16 between the twisted portion and the fixed portion is 300 mm. Twist 45 degrees left and right to make one turn, and check the number of turns until complete disconnection and no continuity.

As shown in Table 1, in Examples 1 and 2, the effects of bending resistance and twist resistance can be confirmed as compared with Reference Example 1. Moreover, it can be said that Example 1 is superior to Example 2.

The above example is merely an example of the present invention, and various modifications and applications are possible as long as they are within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Power supply cable 2 Conductor part 3 Sliding material 4 Covered conductor part 5 Composite conductor part 6 Cushioning material 7 Restraining sliding material 8 Insulator 9 Shield layer 10 Outer layer 11 Bending test device 12 Mandrel 13 Rotating plate 14 Load 15 Torsion test Device 16 Distance between twisted part and fixed part 17 Twisted part

Claims (4)

A conductor part in which a plurality of metal strands are twisted, a composite conductor part in which a plurality of conductor parts are twisted, and an insulator and / or shield layer and / or outer layer coated on the composite conductor part In the cable, a power supply cable having a covered conductor portion coated with a sliding material on at least one of the plurality of conductor portions constituting the composite conductor portion . 2. The coated conductor portion according to claim 1, wherein the sliding material is a tape winding with a fluororesin, and a winding direction of the tape winding is the same direction as a twist direction of the conductor portion. Power cable. In the plurality of conductor portions constituting the composite conductor portion, the covered conductor portion to which the sliding material is applied and the conductor portion to which the sliding material is not applied are arranged adjacent to each other, and The power cable according to claim 1, wherein the power cable is twisted in the same direction as the twist direction of the conductor portion. The power cable according to claim 1, further comprising a sliding material for restraining between the composite conductor portion and the insulator.

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