JPH0553045U - Flexible cable - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a bending resistant cable capable of improving bending resistance without being particular about the shape of a conductor in an insulated core wire. A flex-resistant cable comprising a core having at least one flex-resistant insulating core wire provided with a jacket, wherein a conductor 2 of the flex-resistant insulating core wire is provided around a high tensile strength fiber thread 12 with a copper alloy. It was formed by a copper alloy foil thread 11 formed by horizontally winding a foil tape 13.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a cable such as a cable for a robot and a cable for a sensor which requires bending resistance, and more particularly to a bending resistance cable in which an outer cover is provided on a core having one or more bending resistance insulation core wires.

[0002]

[Prior Art]

 The bending resistance of this type of cable is determined by factors such as the method of twisting the insulated core wires, the selection of the insulator material for the insulated core wires, the selection of the conductor material for the insulated core wires, and the method of twisting together. Various studies have been conducted to improve the bending resistance for each of the above factors.

Among the above-mentioned factors, regarding the method of twisting the conductors in the insulated core wire, the bending resistance can be improved by using a conductor obtained by collectively twisting thin wires and a conductor obtained by twisting the composite wires. It has been said to be obtained.

Further, regarding the selection of the material of the conductor in the insulating core wire, the Fe-P-Zr.In-based high strength copper alloy as disclosed in JP-A-60-75541 and JP-A-62-214146 is used. Also, two kinds of Fe-P-In-Sn-Pb-Sb-Zr-based high-strength and high-conductivity copper alloys have been proposed, as disclosed in JP-A-62-214145. It was premised on conductors twisted together.

[0005]

[Problems to be solved by the device]

 However, the bending resistance required for this type of cable has become more severe as the usage conditions of the cable for robots have become severer and the diameter of sensor cables have become smaller. Therefore, the conventional twisted conductors and the copper alloys based on them have reached the limit of improvement in bending resistance.

The present invention has been made in view of the above problems of the prior art, and the object thereof is to reach a collective twisted wire conductor and a composite twisted wire conductor of high strength copper alloy. It is to provide a flexible cable having a high degree of flexible resistance that has not existed.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the flex-resistant cable of the present invention is a flex-resistant cable comprising a core having one or more flex-resistant insulating core wires and a jacket provided on the core. The above-mentioned conductor is formed by a copper alloy foil yarn formed by horizontally winding a copper alloy foil tape around a high tensile strength fiber yarn.

In the copper alloy foil tape, the Fe content is 0.02 to 0.7% by weight, the P content is 15 to 80% by weight with respect to Fe, and the Zr content and the In content are 0.01 to 0.7% by weight. 0. A high-strength copper alloy containing 5% by weight and the balance being copper is preferable. Further, the copper alloy foil tape has two kinds selected from the group consisting of 0.02 to 0.7% by weight of Fe, 15 to 80% by weight of P relative to Fe, and In, Sn, Pb, Sb. And a high-conductivity copper alloy containing Zr in a total amount of 0.01 to 0.5% by weight with the balance being copper, but the present invention is not limited to these and mechanically. A high-strength copper alloy having excellent characteristics, especially bending resistance may be used.

[0009]

[Action]

 Since the bend-resistant cable of the present invention is formed by the copper alloy foil yarn in which the conductor of the bend-resistant insulated core wire is wound around the high-tensile strength fiber yarn with the copper alloy foil tape horizontally, the copper alloy foil yarn is It expands and contracts according to the expansion and contraction of each core wire, and maintains excellent flex resistance in combination with the characteristics of high tensile strength fiber yarns.

Then, the copper alloy foil tape is made of Fe—P—Zr · In-based high-strength copper alloy or Fe—P—In · Sn · Pb / Sb of the above-described specific composition-Zr-based high-strength / high strength. When made of conductive copper alloy, the bending resistance is particularly excellent due to the synergistic effect of the form and material of the copper alloy foil tape.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings and tables. FIG. 1 is a structural diagram of a conductor of a bending-resistant insulated core wire in the bending-resistant cable of the present invention. FIG. 2 is a cross-sectional view of a bending resistant cable using this conductor. First, the entire flex-resistant cable will be described with reference to FIG. 2, and then the structure of the conductor will be described with reference to FIG.

In FIG. 2, the flex-resistant cable 1 is formed by extruding an insulator 3 such as tetrafluoroethylene-ethylene copolymer (ETFE) onto a conductor 2 by extrusion to form an insulating core wire 4. 2 cores are twisted together to form a pair 5, and a plurality of the pairs 5 (4 pairs in the illustrated example) are assembled to form a cable core 6 and a holding tape 7 is applied with a paper tape or the like. 8 is applied, and an outer cover 9 such as a polyurethane elastomer is extrusion-coated.

In FIG. 1A, the conductor 2 is formed by twisting seven copper alloy foil threads 11. Then, in FIG. 1 (b), each copper alloy foil yarn 11 is obtained by horizontally winding a copper alloy foil tape 13 around a high tensile strength fiber yarn 12.

As the high tensile fiber yarn 12, a polyester synthetic fiber such as Tetron (trade name of Teijin Ltd.), or an aromatic polyamide fiber such as Kepler (trade name of Du Pont), other carbon fiber, ceramic fiber Etc. are used.

As the copper alloy foil tape 13, an Fe—P—Zr · In-based high strength copper alloy as disclosed in JP-A-62-214146, that is, 0.02 to 0.7% by weight of Fe, A high-strength copper alloy containing 15 to 80% by weight of P and 0.01 to 0.5% by weight of Zr and In individually or in a total amount of 0.01 to 0.5% by weight and the balance being copper is used. Here, Fe is mainly added to improve the mechanical strength, and if it exceeds 0.7% by weight, the decrease in conductivity becomes large, while if it is less than 0.02% by weight, the repeated bending strength, tensile strength and The effect of improving heat resistance decreases. Further, by setting the P content to be 15 to 80% by weight of the Fe content in the copper alloy, it is possible to further improve the above-mentioned various properties by the addition of Fe, and if the content is less than the lower limit of the above range. If the effect of adding P is not exhibited, on the other hand, if the amount exceeds the upper limit, the conductivity of the copper alloy is rather deteriorated. The preferable content of P is about 28% by weight of Fe. Further, Zr has an effect of enhancing the heat resistance of the copper alloy, and if In is added to this and coexists, the effect is further enhanced. The total content of Zr and In is 0.01 to 0.5% by weight, and if it is less than 0.01% by weight, the heat resistance improving effect is small, while if it exceeds 0.5% by weight, the copper content is increased. The conductivity of gold cannot be maintained.

As another copper alloy foil tape 13, two kinds of Fe—P—In.Sn.Pb.Sb as disclosed in JP-A-62-214145-Zr-based high strength / high conductivity copper Alloy, that is, 0.02 to 0.7% by weight of Fe, 15 to 80% by weight of P relative to Fe, and two kinds selected from the group consisting of In, Sn, Pb, and Sb, and the total amount of Zr In this case, a high strength and high conductivity copper alloy containing 0.01 to 0.5% by weight and the balance being copper is used. Here, the reason for adding Fe and P and the reason for limitation are the same as above. Zr has the effect of increasing the heat resistance of the copper alloy, and the effect is further enhanced by adding two kinds selected from the group consisting of In, Sn, Pb, and Sb to this. If the total amount is less than 0.01% by weight, the effect of improving heat resistance is small, while if it exceeds 0.5% by weight, the conductivity of the copper alloy cannot be maintained.

Next, concrete combination examples of Comparative Examples 1, 2 and 3 as well as Examples 1 and 2 as shown in Table 1 and Table 2 and flex resistance thereof will be described while comparing Examples and Comparative Examples. Suru Here, regarding the conductive portion of the cross-sectional area of the conductor, the cross-sections of Examples 1 and 2 and Comparative Example 1 are smaller than those of Comparative Examples 2 and 3, but the outer diameter is slightly larger. The thickness of the cable was adjusted so that the cable outer diameters would match. The specific composition of the copper alloy A or copper alloy B used for the sample is as follows, and the structure of the copper alloy foil yarn is as shown in Table 3. Copper alloy A (corresponding to claim 2) Fe: 0.22 wt% P: 0.081 wt% In: 0.012 wt% O: <0.0005 wt% or less Copper alloy B (corresponding to claim 3) Fe: 0.11 wt% P: 0.03 wt% Sn: 0.15 wt% Pb: 0.11 wt% Zr: 0.05 wt% O: <0.0005 wt% or less

[0018]

[Table 1]

[0019]

[Table 2]

[0020]

[Table 3]

As for the number of times of bending in Table 2, as shown in FIG. 3, the cable B is put in the guide rolls A and A having a bending radius (R) of 5 mm, the weight W of 1 kg is attached to the lower end, and the upper end is left and right. It was swung by 90 degrees, and the number of times of bending until all the wires of the conductor 1 were broken was measured. However, one-sided bending was counted as one time. In addition, in each of Examples 1 and 2 and Comparative Examples 1, 2, and 3, five samples are measured, and the average value, the maximum value, and the minimum value range are shown. Here, the display of "greater than or equal to" in the average value and the range indicates that some samples did not break even after exceeding 5 million times.

As is clear from the results of Tables 1 and 2, the copper alloys A and B were used to form the strands by twisting 7 pieces of foil yarn (Examples 1 and 2). The number of times of bending is improved several times as compared with the case where the strands are formed by collective twisting using (1) (Comparative Examples 2 and 3). Moreover, although the number of bendings is improved in Comparative Example 1 in which the strand is formed by twisting 7 pieces of foil yarn using normal soft copper, it is far from Examples 1 and 2. It does not reach. This indicates that the synergistic effect of the foil yarn and the copper alloy is particularly excellent in bending resistance.

[0023]

[Effect of the device]

 The flex-resistant cable of the present invention is formed by forming a conductor of a flex-resistant insulated core wire with a copper alloy foil thread formed by horizontally winding a copper alloy foil tape around a high tensile strength fiber thread. The robot expands and contracts in response to the expansion and contraction of each core wire when the cable is bent, and maintains excellent flex resistance in combination with the characteristics of high tensile strength fiber threads, so a robot that requires severe flex resistance Suitable for cables for sensors and cables for sensors.

The copper alloy foil tape is made of Fe—P—Zr · In-based high-strength copper alloy having a specific composition or Fe—P—In—Sn · Pb / Sb-two types—Zr-based high-strength / high strength. By using a conductive copper alloy, it is possible to maintain particularly excellent bending resistance by the synergistic effect of the morphological surface and the material surface of the copper alloy foil tape.

[Brief description of drawings]

FIG. 1 is a structural diagram of a conductor in a bending resistant cable of the present invention.

FIG. 2 is a cross-sectional view of a flexible cable using this conductor.

FIG. 3 is a diagram showing a bending resistance test.

[Explanation of symbols]

 1 Bend-resistant cable 2 Conductor 4 Insulating core wire 6 Core 9 Outer sheath 11 Copper alloy foil yarn 12 High tensile strength fiber yarn 13 Copper alloy foil tape

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobuhiro Fujio Inventor Nobuhiro Fujio 2-3-1, Iwata-cho, Higashiosaka-shi, Osaka Within Tatsuta Electric Wire Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. A flex-resistant cable comprising a core having at least one flex-resistant insulating core wire and a jacket provided on the core, wherein the conductor of the flex-resistant insulating core wire is made of a copper alloy around a high tensile strength fiber thread. A bend-resistant cable, which is formed by a copper alloy foil thread formed by horizontally winding a foil tape. 2. The copper alloy foil tape contains 0.02% Fe.
~ 0.7 wt%, P to Fe 15 to 80 wt%,
Zr and In are used individually or in a total amount of 0.01 to 0.
The flex-resistant cable according to claim 1, which is made of a high-strength copper alloy containing 5% by weight and the balance being copper. 3. The copper alloy foil tape contains 0.02% Fe.
~ 0.7 wt%, P to 15 to 80 wt% with respect to Fe, and 2 selected from the group consisting of In, Sn, Pb, Sb 2
Containing 0.01 to 0.5% by weight of seeds and Zr in total,
The flex-resistant cable according to claim 1, wherein the balance is made of a high-strength and high-conductivity copper alloy made of copper.