Composite cable

Abstract

To provide a composite cable that is hard to be broken.SOLUTION: In a composite cable 1, a cable core 4 in which a plurality of signal lines 2 where a central conductor part 21 is coated by an insulation coating layer 22, and a plurality of power source lines 3 where a central conductor part 31 is coated by an insulation coating layer 32 are integrated is coated by a sheath 5. The sheath 5 has a plurality of resin layers (a first resin layer 5a, a second resin layer 5b, a third resin layer 5c) laminated with the cable core 4 as an approximate center, and is constituted such that the minimum peel strength out of peel strengths between any of resin layers of the plurality of resin layers is 20 to 70 [N / cm].SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a composite cable. [Background technology]

[0002] BACKGROUND ART Conventionally, for example, in the field of vehicles such as automobiles, a composite cable in which the outer peripheries of a plurality of power lines and a plurality of signal lines are collectively covered with a sheath has been used as a cable for an electric parking brake (EPB). A composite cable is known in which the sheath of the composite cable has a two-layer structure consisting of an inner sheath layer and an outer sheath layer (see, for example, Patent Document 1). The peel strength between the inner sheath layer and the outer sheath layer in this two-layer sheath structure is generally 2.5 to 15 [N / cm]. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 087505 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of the composite cable of Patent Document 1, the peel strength between the inner sheath layer and the outer sheath layer is 15 [N / cm] or less, so when a strong force is applied to the composite cable, the two layers of the sheath will peel off entirely, and there is a risk that the composite cable itself will break. Furthermore, if the peel strength is too high, when a strong force is applied to a composite cable, the two layers of the sheath do not peel away and the force is not dispersed, which can lead to the power or signal lines breaking where the force is concentrated.In particular, in the case of a composite cable in which power and signal lines coexist, the cross-sectional structure of the cable has low symmetry, so force tends to be concentrated in specific areas.

[0005] SUMMARY OF THE INVENTION An object of the present invention is to provide a composite cable that is less susceptible to breakage. [Means for solving the problem]

[0006] In order to solve the above problems, the invention described in claim 1 is as follows: A composite cable in which a cable core, in which a plurality of signal wires each having a central conductor covered with an insulating coating layer and a plurality of power wires each having a central conductor covered with an insulating coating layer are integrated, is covered with a sheath, the sheath has a plurality of resin layers laminated with the cable core substantially at the center, The adhesive sheet is characterized in that the minimum peel strength between any of the resin layers among the plurality of resin layers is 20 to 70 [N / cm].

[0007] The invention described in claim 2 is the composite cable described in claim 1, The sheath is characterized by having a two-layer structure including a first resin layer that is the innermost layer of the sheath and a second resin layer that is in close contact with the outer peripheral surface of the first resin layer.

[0008] The invention described in claim 3 is the composite cable described in claim 1, The plurality of signal lines and the plurality of power supply lines are twisted together. In the case of a signal line pair (twisted signal line) in which a plurality of signal lines are twisted together, the signal line pair and a plurality of power lines are twisted together.

[0009] The invention described in claim 4 is the composite cable according to any one of claims 1 to 3, The plurality of power supply lines may include a power supply line for controlling a brake of a vehicle.

[0010] The invention described in claim 5 is the composite cable according to any one of claims 1 to 3, The plurality of power supply lines include a power supply line that supplies power from a control device of an electric parking brake to an actuator, and the plurality of signal lines include a signal line that transmits a signal from a sensor of an anti-lock brake system to the control device. [Effects of the Invention]

[0011] According to the present invention, a composite cable that is less susceptible to breakage can be obtained. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is an explanatory diagram illustrating an example of a composite cable. [Figure 2] 1 is a cross-sectional view showing the configuration of a composite cable of a first embodiment. [Figure 3] FIG. 6 is a cross-sectional view showing the configuration of a composite cable of a second embodiment. [Figure 4] FIG. 10 is a cross-sectional view showing the configuration of a composite cable of a third embodiment. [Figure 5] FIG. 10 is a cross-sectional view showing the configuration of a composite cable of a fourth embodiment. [Figure 6] FIG. 10 is a cross-sectional view showing the configuration of a composite cable of a fifth embodiment. [Figure 7] 1 is a table showing the material components of each resin layer constituting the sheaths of Examples and Comparative Examples, and the evaluation results of Examples and Comparative Examples. [Figure 8] FIG. 1 is a schematic view of a test device for a bending resistance test, viewed from the axial direction of a mandrel. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the composite cable according to the present invention will be described in detail with reference to the drawings. However, although the embodiments described below are subject to various limitations that are technically preferable for carrying out the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples. In the following description, "numeric value A to numerical value B" refers to a range of "numerical value A or more and numerical value B or less."

[0014] The composite cable 1 can be used as a cable for electronic control of various machines or devices, such as industrial machines, industrial robots, vehicles, and the like. In the following, a case will be described in which the multiple power supply lines in the composite cable include a power supply line for vehicle brake control, but the present invention is not necessarily limited to this case. Specifically, as shown in FIG. 1, the multiple signal lines 2 of the composite cable 1 include a signal line for transmitting a signal from a sensor 81 of an antilock brake system to a control device 80, and the multiple power supply lines 3 include a power supply line for supplying power from a control device 90 of an electric parking brake to an actuator 91. However, the use of the composite cable 1 is not limited to this case.

[0015] [Embodiment 1] In the composite cable 1 of this embodiment, for example, as shown in FIG. 2, a cable core 4 in which a plurality of signal lines 2 and a plurality of power lines 3 are integrated is collectively covered with a sheath 5. Specifically, the composite cable 1 of this embodiment includes two power wires 3, a signal twisted wire 20 formed by twisting together two signal wires 2, a pressure wrap 6 that covers the outer periphery of a cable core 4 formed by twisting together two power wires 3 and the signal twisted wire 20, and a sheath 5 that covers the outer periphery of the cable core 4 via the pressure wrap 6. This composite cable 1 has a four-core structure with two signal lines 2 and two power lines 3 .

[0016] The signal wire 2 is thinner than the power wire 3 , and the twisted signal wire 20 formed by twisting two signal wires 2 together is designed to have a thickness equivalent to that of the power wire 3 . For example, the outer diameter of the signal line 2 is approximately 1.2 mm to 1.6 mm, and the outer diameter of the power line 3 is approximately 2.4 mm to 3.2 mm. 2, the dashed circle including the pair of signal lines 2 indicates that the two signal lines 2 are twisted together, and shows the circumscribing circle of the two twisted signal lines 2.

[0017] The signal wire 2 has a central conductor portion 21 and an insulating coating layer 22 that coats the outer periphery of the central conductor portion 21. The central conductor portion 21 of the signal wire 2 is formed by twisting together a plurality of wires. The power line 3 has a central conductor portion 31 and an insulating coating layer 32 that coats the outer periphery of the central conductor portion 31. The central conductor portion 31 of the power line 3 is formed by twisting together a plurality of wires.

[0018] The cross-sectional area of ​​the central conductor portion 31 of the power line 3 is 0.5 to 4.0 mm 2 The diameter of the wire constituting the central conductor portion 31 is 0.05 to 0.5 mm, and the tensile strength of the wire is 350 to 900 MPa.

[0019] The wires constituting the central conductor portion 21 of the signal line 2 and the central conductor portion 31 of the power line 3 are metal wires made of, for example, a copper alloy or an aluminum alloy. The insulating coating layer 22 of the signal line 2 and the insulating coating layer 32 of the power line 3 are made of a resin material such as polyethylene. The pressure wrap 6 is, for example, a tape member made of paper or nonwoven fabric, and is wrapped around the cable core 4.

[0020] The sheath 5 contains an insulating resin material. Resin materials used for this sheath 5 include, for example, ester-based thermoplastic polyurethane elastomer (TPU), ether-based polyurethane, ethylene-vinyl acetate copolymer resin (EVA), low-density polyethylene (LLDPE), and very-low-density polyethylene (VLDPE). Further, the sheath 5 may contain a flame retardant or an antioxidant such as a metal hydrate, a bromine-based flame retardant, or antimony trioxide.

[0021] The sheath 5 has two or more resin layers laminated approximately at the center of the cable core 4. The multiple resin layers laminated approximately at the center of the cable core 4 are formed in a manner overlapping each other in a substantially concentric manner.

[0022] Here, some definitions regarding the resin layer of the cable core 4 will be given. Even if the resin layers are made of the exact same material, if they are molded in multiple steps, they are considered to be multiple resin layers. (For example, if they are molded in two steps, they are considered to be two layers (double extrusion, etc.).) In addition, even if multiple layers are molded simultaneously, if different materials are extruded, it is considered multiple resin layers (for example, if two different materials are extruded (common extrusion), it is considered two layers). The different materials mentioned above are materials that differ in one or more of their material properties, such as composition, melting point, molecular weight distribution, etc. (Materials that differ in one or more of their material properties, such as composition, melting point, molecular weight distribution, etc., are considered to be different materials.) In particular, materials with different compositions are considered to be dissimilar materials within the preferred range in this embodiment. In this embodiment, materials having the same composition but different melting points are considered to be different materials that are not within the preferred range.

[0023] The sheath 5 of the composite cable 1 shown in Figure 2 has a two-layer structure including a first resin layer 5a located on the innermost layer side of the sheath 5 and a second resin layer 5b in close contact with the outer surface of the first resin layer 5a. The first resin layer 5a of the sheath 5 is formed to a thickness of 0.6 mm, and the second resin layer 5b is formed to a thickness of 0.6 mm. The minimum peel strength between the resin layers in the sheath 5 is set to 20 to 70 [N / cm]. That is, the peel strength between the first resin layer 5a and the second resin layer 5b in the sheath 5 is set to 20 to 70 [N / cm]. A more preferable peel strength is 20 to 50 [N / cm].

[0024] [Embodiment 2] The composite cable 1 shown in Figure 2 is provided with a pressure wrap 6, and a two-layer sheath 5 made of a first resin layer 5a and a second resin layer 5b is provided through the pressure wrap 6. However, for example, as shown in Figure 3, the composite cable 1 may not be provided with a pressure wrap 6 that covers the cable core 4, and instead has a two-layer sheath 5 made of a first resin layer 5a and a second resin layer 5b that directly covers the cable core 4. The second resin layer 5b of the sheath 5 in the composite cable 1 of the second embodiment shown in FIG. 3 is formed to a thickness of 0.6 mm. The peel strength between the first resin layer 5a and the second resin layer 5b in the sheath 5 is 20 to 70 [N / cm], and more preferably 20 to 50 [N / cm].

[0025] [Embodiment 3] The composite cable 1 shown in Figure 2 has a two-layer sheath 5 made of a first resin layer 5a and a second resin layer 5b, with a pressure wrap 6 between them. However, the composite cable 1 may also have a three-layer sheath 5 made of a first resin layer 5a, a second resin layer 5b, and a third resin layer 5c, with a pressure wrap 6 between them, as shown in Figure 4, for example. In the composite cable 1 of embodiment 3 shown in Figure 4, the first resin layer 5a of the sheath 5 is formed to a thickness of 0.4 mm, the second resin layer 5b is formed to a thickness of 0.4 mm, and the third resin layer is formed to a thickness of 0.4 mm. In addition, the smaller of the peel strength between the first resin layer 5a and the second resin layer 5b in this sheath 5 and the peel strength between the second resin layer 5b and the third resin layer 5c is set to 20 to 70 [N / cm], more preferably 20 to 50 [N / cm].

[0026] [Embodiment 4] The composite cable 1 shown in Figure 4 is provided with a pressure wrap 6, and a three-layer sheath 5 made up of a first resin layer 5a, a second resin layer 5b, and a third resin layer 5c is provided through the pressure wrap 6. However, for example, as shown in Figure 5, the composite cable 1 may not be provided with a pressure wrap 6 covering the cable core 4, and instead, a three-layer sheath 5 made up of a first resin layer 5a, a second resin layer 5b, and a third resin layer 5c is provided to directly cover the cable core 4. In the composite cable 1 of the fourth embodiment shown in FIG. 5, the second resin layer 5b of the sheath 5 is formed to a thickness of 0.4 mm, and the third resin layer is formed to a thickness of 0.4 mm. In addition, the smaller of the peel strength between the first resin layer 5a and the second resin layer 5b in this sheath 5 and the peel strength between the second resin layer 5b and the third resin layer 5c is set to 20 to 70 [N / cm], more preferably 20 to 50 [N / cm].

[0027] [Embodiment 5] The composite cable 1 shown in FIG. 3 has a four-core structure including two power wires 3 and a signal twisted wire 20 formed by twisting two signal wires 2 together, but the composite cable 1 may also have a six-core structure including two power wires 3 and two pairs of signal twisted wires 20, as shown in FIG. 6, for example. The composite cable 1 shown in FIG. 6 does not have a pressure wrap 6 that covers the cable core 4, but has a sheath 5 with a two-layer structure consisting of a first resin layer 5a and a second resin layer 5b that directly covers the cable core 4. The second resin layer 5b of the sheath 5 in the composite cable 1 of the fifth embodiment shown in FIG. 6 is formed to a thickness of 0.6 mm. The peel strength between the first resin layer 5a and the second resin layer 5b in the sheath 5 is 20 to 70 [N / cm], and more preferably 20 to 50 [N / cm].

[0028] [Other embodiments] The composite cable 1 having a six-core structure including two power lines 3 and two pairs of twisted signal lines 20 may be configured as follows. The composite cable 1 does not have a pressure wrap 6 covering the cable core 4, and has a sheath 5 with a three-layer structure consisting of a first resin layer 5a, a second resin layer 5b, and a third resin layer 5c that directly covers the cable core 4. The composite cable 1 is provided with a pressure wrap 6 covering a cable core 4, and a sheath 5 having a two-layer structure of a first resin layer 5a and a second resin layer 5b is provided through the pressure wrap 6. A composite cable (1) is provided with a pressure wrap (6) that covers a cable core (4), and a sheath (5) having a three-layer structure of a first resin layer (5a), a second resin layer (5b), and a third resin layer (5c) is provided through the pressure wrap (6).

[0029] In addition, the composite cable 1 having the above-mentioned four-core structure or the composite cable 1 having the six-core structure may also be a composite cable 1 having a signal twisted wire 20 provided with an inner sheath covering the outer periphery of a pair of signal wires 2.

[0030] [Example] The present invention will be specifically described below based on examples, but the present invention is not limited to these. FIG. 7 is a table showing the material components of the sheath 5 (first resin layer 5a, second resin layer 5b, third resin layer 5c) in the composite cables of Examples 1 to 9 and Comparative Examples 1 to 5, and the evaluation results of Examples 1 to 9 and Comparative Examples 1 to 5. The outer diameter of the four-core composite cables of Examples 1 to 8 and Comparative Examples 1 to 5 is 8 mm, and the outer diameter of the cable core is approximately 5.6 mm. The outer diameter of the six-core composite cable of the example is 9 mm, and the outer diameter of the cable core is approximately 6.6 mm.

[0031] Details of the material components of the sheath 5 (first resin layer 5a, second resin layer 5b, third resin layer 5c) shown in Fig. 7 are shown below: This sheath 5 is irradiated with an electron beam after extrusion molding. Silane-crosslinked VLDPE (*1): 100 parts of Dow's Engage 8100, 3 parts of KBM1003, and 0.1 parts of Perhexa 25B were added and melt-mixed in a BM mixer at 200°C for 5 minutes, and then 0.1 parts of Adeka Stab OT-1 was added during sheath extrusion to silane-crosslink the mixture. (Engage 8100 (trade name: VLDPE (very low density polyethylene), manufactured by Dow), KBM-1003 (trade name: trimethoxyvinylsilane, manufactured by Shin-Etsu Silicones), Perhexa 25B (trade name: 2,5-dimethyl-2,5-di-tert-butylperoxyhexane, decomposition temperature 154°C, manufactured by NOF Corporation), Adeka Stab OT-1 (trade name: dioctyltin dilaurate, manufactured by ADEKA Corporation) ET385-50 (product name), ether-based polyurethane, manufactured by BASF Resamine P-7000 (product name), TPU (thermoplastic polyurethane elastomer), manufactured by Dainichiseika Color & Chemicals Mfg. Co., Ltd. Resamine P-2288 (product name), TPU (thermoplastic polyurethane elastomer), manufactured by Dainichiseika Color & Chemicals Mfg. Co., Ltd. Evaflex EV360 (product name), EVA (ethylene-vinyl acetate copolymer resin), Manufactured by DuPont Mitsui Polychemicals Evaflex EV180 (product name), EVA (ethylene-vinyl acetate copolymer resin), Manufactured by DuPont Mitsui Polychemicals Evolue SP2520 (product name), LLDPE (linear low-density polyethylene), manufactured by Prime Polymer

[0032] The composite cable 1 of Example 1 is a configuration of Embodiment 1 (Figure 2), and has a sheath 5 with a two-layer structure, with Evaflex EV360 used for the first resin layer 5a and Rezamin P-2288 used for the second resin layer 5b.

[0033] The composite cable 1 of Example 2 is a configuration of Embodiment 1 (Figure 2), and has a sheath 5 with a two-layer structure, with Evaflex EV180 used for the first resin layer 5a and Rezamin P-2288 used for the second resin layer 5b.

[0034] The composite cable 1 of Example 3 is a form of Embodiment 1 (FIG. 2), and has a sheath 5 with a two-layer structure, with Evolue SP2520 used for the first resin layer 5a and Rezamin P-2288 used for the second resin layer 5b.

[0035] The composite cable 1 of Example 4 is a configuration of Embodiment 2 (Figure 3), and has a sheath 5 with a two-layer structure, with Evaflex EV360 used for the first resin layer 5a and Rezamin P-2288 used for the second resin layer 5b.

[0036] The composite cable 1 of Example 5 is a form of Embodiment 2 (FIG. 3), and has a sheath 5 with a two-layer structure, with Evolue SP2520 used for the first resin layer 5a and Rezamin P-2288 used for the second resin layer 5b.

[0037] The composite cable 1 of Example 6 is a configuration of embodiment 3 (Figure 4) and has a three-layer sheath 5, with Evaflex EV360 used for the first resin layer 5a, Rezamin P-7000 used for the second resin layer 5b, and Rezamin P-2288 used for the third resin layer 5c. The peelability test for the composite cable 1 of Example 6 was carried out between the first resin layer 5a and the second resin layer 5b.

[0038] The composite cable 1 of Example 7 is a configuration of embodiment 3 (Figure 4), and has a three-layer sheath 5, with Evaflex EV180 used for the first resin layer 5a, Evaflex EV360 used for the second resin layer 5b, and Rezamin P-2288 used for the third resin layer 5c. The peeling test for the composite cable 1 of Example 7 was carried out between the second resin layer 5b and the third resin layer 5c.

[0039] The composite cable 1 of Example 8 is a configuration of embodiment 4 (Figure 5) and has a three-layer sheath 5, with Evaflex EV360 used for the first resin layer 5a, Rezamin P-7000 used for the second resin layer 5b, and Rezamin P-2288 used for the third resin layer 5c. The peeling test for the composite cable 1 of Example 8 was carried out between the first resin layer 5a and the second resin layer 5b.

[0040] The composite cable 1 of Example 9 is a form of embodiment 5 (Figure 6), and has a sheath 5 with a two-layer structure, with Evaflex EV360 used for the first resin layer 5a and Rezamin P-2288 used for the second resin layer 5b.

[0041] The composite cable 1 of Comparative Example 1 is of the same configuration as that of Embodiment 1 (Figure 2), and has a two-layer sheath 5, with the first resin layer 5a made of electron beam cross-linked Evolue SP2520 and the second resin layer 5b made of Resamine P-2288. The electron beam crosslinked Evolue SP2520 was obtained by crosslinking a non-crosslinked commercially available product (Evolue SP2520) by irradiating it with an electron beam.

[0042] The composite cable 1 of Comparative Example 2 is of the same configuration as that of Embodiment 1 (Figure 2), and has a two-layer sheath 5, with silane-crosslinked VLDPE (*1) used for the first resin layer 5a and ET385-50 used for the second resin layer 5b.

[0043] The composite cable 1 of Comparative Example 3 is of the same configuration as that of Embodiment 1 (Figure 2), and has a two-layer sheath 5, with the first resin layer 5a made of electron beam cross-linked Evaflex EV360 and the second resin layer 5b made of ET385-50. The electron beam crosslinked Evaflex EV360 is a commercially available non-crosslinked product (Evaflex EV360) that has been crosslinked by irradiating it with an electron beam.

[0044] The composite cable 1 of Comparative Example 4 is of the same configuration as that of Embodiment 1 (Figure 2), and has a two-layer sheath 5, with Resamine P-7000 used for the first resin layer 5a and Resamine P-2288 used for the second resin layer 5b.

[0045] The composite cable 1 of Comparative Example 5 is the same as that of Embodiment 1 (FIG. 2), and has a sheath 5 with a two-layer structure, with Evaflex EV360 used for the first resin layer 5a and Evaflex EV360 used for the second resin layer 5b.

[0046] When the composite cables 1 of Examples 1 to 9 and Comparative Examples 1 to 5 were formed, the sheaths 5 after extrusion were irradiated with electron beams.

[0047] [Evaluation test] The composite cables 1 of Examples 1 to 9 and Comparative Examples 1 to 5 were subjected to the following peelability test, bending test, and terminal processability test, and the evaluation results are shown in FIG.

[0048] [Peeling test] The composite cables 1 of Examples 1 to 9 and Comparative Examples 1 to 5 were subjected to a peeling test. Specifically, the composite cable 1 is cut into pieces of approximately 500 mm in length, and then cut longitudinally so that the cross-sectional area is approximately half. When cutting, the cable core is removed from the sheath. If peeling occurs between any of the multiple resin layers that make up the sheath at this time, the peel strength is less than 20 N / cm, which is low, and the peelability is considered to be "low." Next, the sheath is cut open and the resin layers are peeled off about 50 mm from the end of the sheet-like sheath piece. At this time, the peel strength between the resin layers that do not peel off exceeds 70 N / cm, which is strong and is considered to be "high" peelability. For those pieces in which the resin layers could be peeled off from the end of the sheet-shaped sheath piece by approximately 50 mm, one resin layer and the other resin layer were each gripped with a chuck, and the peel strength between the resin layers was measured in accordance with the 180° peel test described in JIS-K-6854-2 (1999). The peel strength was measured over a peel length of 300 mm, and the average peel strength over a 250 mm range excluding the first 25 mm and the last 25 mm was taken as the peel strength between the resin layers.

[0049] [Flexibility test] The composite cables 1 of Examples 1 to 9 and Comparative Examples 1 to 5 were subjected to a bending test. FIG. 8 is a schematic diagram of the test device used in this test, viewed from the axial direction of the mandrel. As shown in Figure 8, the testing device has two mandrels 61, 62 arranged horizontally and parallel to each other with a predetermined distance between them, and anti-vibration clamps 71, 72 arranged vertically below the mandrels 61, 62 with a predetermined distance between them. The composite cable 1 of Examples 1 to 9 or Comparative Examples 1 to 5 was placed vertically between the mandrels 61 and 62 and between the presser foot 71 and 72, and a weight W was attached to the lower end of the composite cable 1. In this state, the upper end of the composite cable 1 was repeatedly bent left and right so as to alternately contact the upper outer periphery of the left and right mandrels 61 or 62. The number of bends was counted as one bend when the composite cable 1 was bent so as to contact the outer periphery of either the left or right mandrel 61 or 62. The test conditions were as follows: the mandrel diameter was the same as the outer diameter, the left and right bending angle was 90°, and the speed was 120 bends / min. The weight was 2 kg, and the clearance between the cable and the mandrel was 1 mm. The length of the bend was adjusted so that the upper side of the composite cable 1 contacted the upper outer periphery of each mandrel 61 or 62, and the test was performed in an atmosphere of 25°C. The composite cables 1 were then connected in series in a loop shape, and current was applied to measure the number of bends until breakage occurred. That is, by connecting the ends of the conductor portions 21 of the signal lines 2 of the composite cable 1, or the ends of the conductor portions 31 of the power lines 3, or connecting the ends of the conductor portions 21 of the signal lines 2 and the ends of the conductor portions 31 of the power lines 3, the multiple signal lines 2 and the multiple power lines 3 were linked to form a single electric wire, and the wire was repeatedly bent while current was passed through both ends of the unified electric wire. The composite cable 1 was evaluated for pass / fail based on the number of times it could be bent until breakage occurred. "A" below indicates good (pass) and "B" indicates bad (fail). A: Over 100,000 times B: Less than 100,000 times

[0050] [Terminal workability test] The composite cables 1 of Examples 1 to 9 and Comparative Examples 1 to 5 were evaluated for stripping property (terminal workability) when stripping the sheath at 100 mm of the end portion. Specifically, a slit was made in the circumferential direction perpendicular to the axial direction (extension direction) of the composite cable 1 to a depth of 90% of the coating thickness (sheath thickness) of the composite cable 1. Next, a blade with a notch was placed between the outermost layer and the second outermost layer of the multiple resin layers that make up the sheath, and the sheath of one composite cable was grasped at the notch, and the other composite cable was pulled out. The composite cables thus drawn were subjected to a sheath termination processability test and evaluated for pass or fail according to the following criteria: "A" indicates good (passed), and "B" indicates bad (failed). A: When the cable you pulled out has no remaining sheath that should be pulled out. B: When the sheath that should have been pulled out remains in the pulled-out cable

[0051] [Test Results] The test evaluation results for Examples 1 to 9 and Comparative Examples 1 to 5 are shown in the table of FIG. Examples 1 to 9 were shown to have good flexibility and good terminal processability. Moreover, the peel strength of each of Examples 1 to 9 was in the range of 20 [N / cm] or more and 70 [N / cm] or less, which indicated that the peelability was appropriate.

[0052] On the other hand, Comparative Examples 1 to 3 failed in the terminal processability, and Comparative Examples 4 and 5 failed in the flexibility. Furthermore, the releasability of Comparative Examples 1 to 3 was rated as "low," while the releasability of Comparative Examples 2 to 4 was rated as "high," indicating that Comparative Examples 1 to 5 had problems with releasability.

[0053] [Technical Effects of the Embodiments of the Invention] As with the composite cable 1 of the above embodiment, a composite cable 1 in which a cable core 4, in which a plurality of signal lines 2 and a plurality of power lines 3 are integrated, is covered with a sheath 5, and the sheath 5 has a plurality of resin layers (a first resin layer 5a, a second resin layer 5b, a third resin layer 5c), and the composite cable 1 is configured so that the minimum peel strength among the resin layers of the sheath 5 is 20 to 70 [N / cm], can achieve the effect of being less susceptible to breakage. Specifically, the peel strength between the resin layers constituting the sheath 5 of the composite cable 1 of this embodiment is 20 [N / cm] or more, so when a strong force is applied to the composite cable 1 and it is bent, peeling does not occur between the resin layers throughout the entire sheath 5, and the composite cable itself does not break as in the composite cables of conventional technology. Furthermore, even if the peel strength between any of the multiple resin layers that make up the sheath 5 of the composite cable 1 exceeds 70 [N / cm], there are at least resin layers between which the peel strength is 20 to 70 [N / cm]. Therefore, when a strong force acts on the composite cable 1 and it is bent, peeling will occur at one of the resin layers that make up the sheath 5, dispersing the force so that it does not become concentrated in one place, and the power line 3 or signal line 2 will not break as in the composite cables of the prior art.

[0054] As described above, the composite cable 1 of this embodiment has a sheath 5 having multiple resin layers (first resin layer 5a, second resin layer 5b, third resin layer 5c), and the minimum peel strength between the resin layers of the sheath 5 is 20 to 70 [N / cm].Therefore, when a strong force acts on the composite cable 1 and it is bent, the force can be dissipated appropriately, so the composite cable 1 will not be damaged. That is, the composite cable 1 of this embodiment can be suitably used as a composite cable with excellent bending resistance.

[0055] The application of the present invention is not limited to the above-described embodiment, and can be modified as appropriate within the scope of the present invention. [Explanation of symbols]

[0056] 1 composite cable 2 signal lines 20 Signal stranded wire 21 Center conductor 22 Insulating coating layer 3 Power line 31 Center conductor 32 Insulating coating layer 4 cable cores 5 Sheath 5a 1st resin layer 5b 2nd resin layer 5c 3rd resin layer 6 Pressing 61,62 Mandrel 71,72 Presser foot 80 Control Device 81 Sensors 90 Control Device 91 Actuator W weight

Claims

1. A composite cable in which a cable core, in which a plurality of signal wires each having a central conductor covered with an insulating coating layer and a plurality of power wires each having a central conductor covered with an insulating coating layer are integrated, is covered with a sheath, the sheath has a plurality of resin layers laminated with the cable core substantially at the center, A composite cable characterized in that the minimum peel strength between any of the resin layers in the plurality of resin layers is configured to be 20 to 70 [N / cm].

2. The composite cable according to claim 1, characterized in that the sheath has a two-layer structure comprising a first resin layer on the innermost side of the sheath and a second resin layer in close contact with the outer surface of the first resin layer.

3. 2. The composite cable according to claim 1, wherein the plurality of signal lines and the plurality of power lines are twisted together.

4. 4. The composite cable according to claim 1, wherein the plurality of power supply lines includes a power supply line for controlling a brake of a vehicle.

5. 4. The composite cable according to claim 1, wherein the plurality of power supply lines includes a power supply line for supplying power from a control device of an electric parking brake to an actuator, and the plurality of signal lines includes a signal line for transmitting a signal from a sensor of an antilock brake system to the control device.

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