JP2024051300A - Composite Cable - Google Patents

Abstract

[Problem] To provide a composite cable that can enhance flexibility while suppressing increases in cost. [Solution] A composite cable (2) has first and second power lines (3A, 3B) and first and second signal lines (4A, 4B). Each of the first and second power lines (3A, 3B) has a power line conductor (30) and an insulator (300) that covers the outer periphery of the power line conductor (30). The power line conductor (30) is formed by twisting together a plurality of bunched strands (31-37), each of which is made up of a plurality of metal strands (310, 320, 330, 340, 350, 360, 370), and among the plurality of bunched strands (31-37), a strand diameter D10 of the metal strands (310) of a central bunched strand (31) located at the center of the power line conductor (30) is smaller than each strand diameter D20 of the metal strands (320, 330, 340, 350, 360, 370) of the other peripheral bunched strands (32-37). [Selected figure] Figure 3

Description

The present invention relates to a composite cable having multiple power lines and multiple signal lines.

The applicant has proposed a composite cable described in Patent Document 1 as a composite cable for connecting, for example, the wheel side and the body side of a vehicle. This composite cable includes a twisted pair wire formed by twisting together a pair of first electric wires, each of which has a first conductor covered by a first insulator, a pair of power lines, each of which has a second conductor with a larger cross-sectional area than the first conductor covered by a second insulator, and a sheath that collectively covers the twisted pair wire and the pair of power lines. The first conductor is formed by twisting together multiple metal wires, and the second conductor is formed by twisting together multiple bunched wires, each of which has multiple metal wires twisted together.

JP 2019-140006 A

As mentioned above, the composite cable connecting the wheel side and the vehicle body side is required to have high flexibility so that it can bend flexibly in response to the vertical movement of the wheel relative to the vehicle body. In order to increase flexibility, it is effective to reduce the wire diameter of the metal wires, but reducing the wire diameter increases manufacturing costs.

Therefore, the present invention aims to provide a composite cable that can increase flexibility while suppressing increases in costs.

To achieve the above object, the present invention provides a composite cable having a plurality of power lines and a plurality of signal lines, each of the plurality of power lines having a power line conductor and an insulator covering the outer circumference of the power line conductor, the power line conductor being constructed by twisting together a plurality of bunched strands each of which is made by twisting together a plurality of metal strands, and the strand diameter of each of the plurality of metal strands of at least one bunched strand located at the center of the power line conductor among the plurality of bunched strands is smaller than the strand diameter of each of the plurality of metal strands of other bunched strands surrounding the at least one bunched strand among the plurality of bunched strands.

The composite cable of the present invention makes it possible to increase flexibility while suppressing increases in costs.

1A is an external view showing a vehicle to which a composite cable according to an embodiment of the present invention is attached, and FIG. 1B is a configuration diagram showing the periphery of one wheel. FIG. 2 is an explanatory diagram for explaining a configuration of a composite cable. 3 is a cross-sectional view of the composite cable taken along line AA in FIG. 2. FIG. 2 is a cross-sectional view showing central bunched strands and peripheral bunched strands in a power line conductor, spaced apart from each other. 1A is a cross-sectional view showing a power supply line according to a first modified example, and FIG. 1B is a cross-sectional view showing a power supply line according to a second modified example. 13 is a cross-sectional view showing a configuration of a composite cable according to a modified example.

[Embodiment]
(Vehicle configuration)
Fig. 1(a) is an external view showing a vehicle 1 to which a composite cable 2 according to an embodiment of the present invention is attached. Fig. 1(b) is a configuration diagram showing the periphery of one of a plurality of wheels 10 of the vehicle 1. The composite cable 2 has a plurality of power lines and a plurality of signal lines. In this embodiment, a case will be described in which the composite cable 2 has two power lines and two signal lines, but the number of power lines and signal lines is not limited thereto.

The wheel 10 is supported by the suspension device 12 on the vehicle body 11 so as to be movable in the vertical direction. The suspension device 12 is composed of an upper arm 121, a lower arm 122, a shock absorber 123, and a suspension spring 124. One end of each of the upper arm 121 and the lower arm 122 is connected to the knuckle 13, and the other end is connected to the vehicle body 11. The upper arm 121 is connected to the upper mounting part 131 of the knuckle 13 together with the shock absorber 123, and the lower arm 122 is connected to the lower mounting part 132 of the knuckle 13. The suspension spring 124 is arranged coaxially on the outer periphery of the shock absorber 123, and expands and contracts in response to the vertical movement of the vehicle body 11 relative to the road surface.

The knuckle 13 is fitted with a hub unit 14, an electric brake device 15, and a rotational speed sensor 16. Hereinafter, the part closer to the wheel 10 than the suspension spring 124 is referred to as the "unsprung part," and the part closer to the vehicle body 11 is referred to as the "sprung part." The unsprung part includes the wheel 10, the suspension device 12, the knuckle 13, the hub unit 14, the electric brake device 15, and the rotational speed sensor 16. The sprung part includes the vehicle body 11 and a wheel house 111 that is fixed to the vehicle body 11 and surrounds the wheel 10.

The hub unit 14 has an outer ring 141 fixed to the knuckle 13 by a number of bolts 140, and a hub ring 142 supported so as to be freely rotatable relative to the outer ring 141. A wheel mounting flange 142a is provided on the hub ring 142, and the wheel 10 and brake rotor 17 are attached to the wheel mounting flange 142a by a number of hub bolts 143. The electric brake device 15 presses brake pads 151 against the brake rotor 17 to generate frictional force and brake the wheel 10. The rotational speed sensor 16 is fixed to the outer ring 141 and detects the magnetic field of a magnetic encoder that rotates integrally with the hub ring 142.

The vehicle 1 is equipped with a control device 100 that controls the electric brake device 15, and the control device 100 is electrically connected to the electric brake device 15 and the rotation speed sensor 16 via a composite cable 2. The composite cable 2 may be electrically connected to the control device 100 via a relay component such as a terminal block on the vehicle body side.

The composite cable 2 is fixed to the sprung and unsprung parts at multiple points by fasteners. FIG. 1(b) shows a bracket 18 on the vehicle body side and a bracket 19 on the wheel side as fasteners. The bracket 18 on the vehicle body side is attached to the wheel housing 111. The bracket 19 on the wheel side is attached to the upper mounting portion 131 of the knuckle 13. The composite cable 2 is suspended in the air between the bracket 18 on the vehicle body side and the bracket 19 on the wheel side. In other words, both ends of the portion of the composite cable 2 suspended in the air are fixed to the vehicle body side and the wheel side by the bracket 18 on the vehicle body side and the bracket 19 on the wheel side, respectively.

(Composite cable configuration)
Fig. 2 is an explanatory diagram for explaining the configuration of the composite cable 2. Fig. 3 is a cross-sectional view of the composite cable 2 taken along line AA in Fig. 2.

The composite cable 2 has first and second power wires 3A, 3B and first and second signal wires 4A, 4B. The first and second signal wires 4A, 4B are twisted together to form a twisted pair wire 40. In this embodiment, the twisted pair wire 40 is covered with an internal sheath 400, and the twisted pair wire 40 and the internal sheath 400 form the signal line cable 4. The internal sheath 400 is made of, for example, urethane resin. The first and second power wires 3A, 3B and the signal line cable 4 are twisted together to form an assembly 20.

The composite cable 2 also has a tape member 5 wound in a spiral shape around the assembly 20, and a sheath 6 covering the outer circumference of the tape member 5. The sheath 6 is made of, for example, urethane resin. As the tape member 5, it is preferable to use a material that is easily slippery against the first and second power lines 3A, 3B and the signal line cable 4 and has a small coefficient of friction, and for example, a strip-shaped material made of nonwoven fabric, paper, or resin can be used. However, the tape member 5 may be omitted. In this case, when the composite cable 2 is bent, the first and second power lines 3A, 3B and the signal line cable 4 slide on the inner surface of the sheath 6. In order to make this sliding smooth, a lubricant such as talc may be placed between the first and second power lines 3A, 3B and the signal line cable 4 and the sheath 6.

An interposer 7 is disposed in the gap between the assembly 20 and the tape member 5. The interposer 7 is, for example, polypropylene yarn, spun yarn (rayon staple fiber), aramid fiber, nylon fiber, etc. However, the interposer 7 does not have to be disposed between the assembly 20 and the tape member 5. Note that the interposer 7 is not shown in FIG. 2.

The first and second power lines 3A, 3B and the first and second signal lines 4A, 4B have one end connected to the vehicle body side and the other end connected to the wheel side. In this embodiment, one end of the first and second power lines 3A, 3B is connected to the control device 100, and the other end of the first and second power lines 3A, 3B is connected to the electric brake device 15. In addition, one end of the first and second signal lines 4A, 4B is connected to the control device 100 and the other end is connected to the rotational speed sensor 16.

The connection target of one end of each of the first and second power lines 3A, 3B and the first and second signal lines 4A, 4B is not limited to the control device 100, but may be any on-board device mounted on the vehicle body side. The connection target of the other end of the first and second power lines 3A, 3B is not limited to the electric brake device 15, but may be, for example, an electronically controlled shop absorber whose damping force can be adjusted by electronic control. Furthermore, the connection target of the other end of the first and second signal lines 4A, 4B is not limited to the rotational speed sensor 16, but may be, for example, an actuator on the wheel side such as the electric brake device 15 or the electronically controlled shop absorber as described above. In this case, the first and second signal lines 4A, 4B transmit control signals for the actuators. The connection target of the other end of the first and second signal lines 4A, 4B may be a sensor for detecting the state of the wheel 10, such as an air pressure sensor.

The first and second power supply lines 3A and 3B supply operating power from the control device 100 to the electric brake device 15 for operating the electric brake device 15. The first and second signal lines 4A and 4B send a signal indicating the rotational speed of the wheel 10 from the rotational speed sensor 16 to the control device 100.

The first and second signal lines 4A and 4B each have a signal line conductor 41 and an insulator 42 that covers the outer circumference of the signal line conductor 41. The signal line conductor 41 is a twisted wire in which a plurality of metal strands 410 are twisted together. The metal strands 410 may be made of, for example, copper or a copper alloy. The surface of the metal strands 410 may also be plated with tin, nickel, silver, zinc, or the like. The insulator 42 is made of an insulating resin, for example, cross-linked polyethylene.

The first and second power lines 3A and 3B each have a power line conductor 30 and an insulator 300 that covers the outer circumference of the power line conductor 30. The insulator 300 is made of an insulating resin such as cross-linked polyethylene. The conductor cross-sectional area of the power line conductor 30 is larger than the conductor cross-sectional area of the signal line conductor 41, and the wire diameter of the first and second power lines 3A and 3B is larger than the wire diameter of the first and second signal lines 4A and 4B.

The power line conductor 30 is composed of multiple (seven in this embodiment) bunched strands 31-37 twisted together. Of the multiple bunched strands 31-37, one bunched strand 31 is located at the center of the power line conductor 30, and the other bunched strands 32-37 are twisted in a spiral shape around the outer periphery of the one bunched strand 31. Hereinafter, the one bunched strand 31 located at the center of the power line conductor 30 will be referred to as the central bunched strand 31, and the other bunched strands 32-37 will be referred to as the peripheral bunched strands 32-37.

Figure 4 is a cross-sectional view showing the central bunched strand 31 and the peripheral bunched strands 32-37 of the power line conductor 30 at intervals. The central bunched strand 31 is composed of multiple metal strands 310 twisted together. The peripheral bunched strands 32-37 are each composed of multiple metal strands 320, 330, 340, 350, 360, 370 twisted together. The metal strands 310, 320, 330, 340, 350, 360, 370 can be made of, for example, copper or a copper alloy. The surfaces of the metal strands 310, 320, 330, 340, 350, 360, 370 may be plated with tin, nickel, silver, zinc, or the like.

The wire diameter _D10 of each of the multiple metal wires 310 in the central bunched strand 31 is smaller than the wire diameter _D20 of each of the multiple metal wires 320, 330, 340, 350, 360, 370 in the peripheral bunched strands 32-37. In this embodiment, this difference in wire diameter increases bendability while suppressing increases in costs. In other words, in general, a stranded wire made by twisting multiple metal wires together bends more flexibly and has higher bendability as the wire diameter decreases, but more processes are required to manufacture thin metal wires, which increases costs. Therefore, in this embodiment, the wire diameter _D10 of only one central bunched strand 31 located at the center of the power line conductor 30, which experiences the greatest bending strain when bent, is made smaller than the wire diameter _D20 of the other peripheral bunched strands 32-37, thereby significantly suppressing increases in costs compared to when the wire diameters of all the bunched strands 31-37 constituting the power line conductor 30 are made smaller.

Here, the peripheral bunched strands 32-37 are wound in a spiral shape around the central bunched strand 31, and the length of the peripheral bunched strands 32-37 per unit length of the first and second power lines 3A, 3B is longer than the length of the central bunched strand 31. For this reason, if all the bunched strands 31-37 had the same strand diameter, when the first and second power lines 3A, 3B were bent, the peripheral bunched strands 32-37 would have a higher tolerance to bending stress than the central bunched strand 31. For this reason, in this embodiment, only the strand diameter _D10 of the central bunched strand 31 is made smaller than the strand diameter _D20 of the other peripheral bunched strands 32-37, thereby improving bendability and bending durability while suppressing increases in costs.

It is desirable for the wire diameter _D10 of the metal wires 310 of the central bunched strand 31 to be 80% or less of the wire diameter _D20 of each of the metal wires 320, 330, 340, 350, 360, 370 of the peripheral bunched strands 32 to 37. By setting the wire diameter _D10 of the central bunched strand 31 to be 80% or less of the wire diameter _D20 of the peripheral bunched strands 32 to 37, the magnitude of bending strain of the central bunched strand 31 and the peripheral bunched strands 32 to 37 when bent is balanced, and a highly improved effect is obtained in terms of bendability and bending durability compared to a case in which the wire diameter _D10 of the central bunched strand 31 is the same as the wire diameter _D20 of the peripheral bunched strands 32 to 37.

Furthermore, it is desirable for the wire diameter _D10 of the metal wires 310 of the central bunched strand 31 to be 50% or more of the wire diameter _D20 of each of the metal wires 320, 330, 340, 350, 360, 370 of the peripheral bunched strands 32 to 37. If this ratio is less than 50%, it will be difficult to obtain an improvement in the flexibility and bending durability of the first and second power cords 3A, 3B that is commensurate with the increased cost due to the reduction in the diameter of the metal wires 310 of the central bunched strand 31.

In this way, it is desirable for the strand diameter _D10 of the metal strands 310 of the central bunched strand 31 to be 50% or more and 80% or less of the strand diameter _D20 of each of the metal strands 320, 330, 340, 350, 360, 370 of the peripheral bunched strands 32-37.

The twist pitch of the metal wires 310 in the central bunched strand 31 is the same as or smaller than the twist pitch of the metal wires 320, 330, 340, 350, 360, 370 in the peripheral bunched strands 32 to 37. As an example, it is desirable that the twist pitch of the metal wires 310 in the central bunched strand 31 is 50% or more of the twist pitch of the metal wires 320, 330, 340, 350, 360, 370 in the peripheral bunched strands 32 to 37. Note that the twist pitch of the metal wires 310 in the central bunched strand 31 here refers to the longitudinal distance of the central bunched strand 31 at which any metal wires 310 in the outer periphery of the central bunched strand 31 among the multiple metal wires 310 are located at the same circumferential position of the central bunched strand 31. The same applies to the twist pitch of each of the metal wires 320, 330, 340, 350, 360, and 370 of the peripheral bundled strands 32 to 37.

Furthermore, in this embodiment, the number of metal wires 310 in the central bunched strand 31 is greater than the number of metal wires 320, 330, 340, 350, 360, 370 in each of the peripheral bunched strands 32-37, and the outer diameter _D1 of the central bunched strand 31 is equal to the outer diameter _D2 of each of the peripheral bunched strands 32-37. More specifically, the outer diameter _D1 of the central bunched strand 31 is 90% or more and 110% or less of the outer diameter _D2 of each of the peripheral bunched strands 32-37. This prevents large gaps from being generated between the central bunched strand 31 and the peripheral bunched strands 32-37, or between the peripheral bunched strands 32-37 themselves, and stabilizes the positional relationship between the central bunched strand 31 and the peripheral bunched strands 32-37.

In Fig. 4, the twist direction (child twist direction) of the metal wires 310 in the central bunched strand 31 and the twist direction (child twist direction) of each of the metal wires 320, 330, 340, 350, 360, 370 in the peripheral bunched strands 32-37 are indicated by arrow _A30 . In Fig. 3, the twist direction (parent twist direction) of the central bunched strand 31 and the peripheral bunched strands 32-37 in the first and second power wires 3A, 3B is indicated by arrow _A3 . In Fig. 3, the twist direction of the multiple metal wires 410 in the first and second signal wires 4A, 4B is indicated by arrow _A40 , and the twist direction of the first and second signal wires 4A, 4B in the twisted pair wire 40 is indicated by arrow _A4 . Furthermore, in Figures 3 and 2, the twisting direction of the first and second power lines 3A, 3B and the signal line cable 4 in the assembly 20 is indicated by arrow _A20 , and the winding direction of the tape member 5 around the outer periphery of the assembly 20 is indicated by arrow _A5 .

Here, the twisting direction refers to the rotation direction of each of the first and second power wires 3A and 3B, the metal wires 310, 320, 330, 340, 350, 360, and 370, the signal line cable 4, the first and second signal wires 4A and 4B, and the metal wire 410 when the composite cable 2 is viewed from one axial side (for example, the left side in FIG. 2) along its central axis. The same applies to the winding direction of the tape member 5. In the illustrated examples of FIG. 2 to FIG. 4, the twisting directions indicated by the arrows _A30 , _A3 , _A40 , _A4 , and _A20 and the winding direction of the tape member ₅ indicated by the arrow A5 are all counterclockwise.

By having the same twist direction in this way, the bending durability of the first and second power lines 3A, 3B in particular is improved. In other words, if the twist direction (child twist direction) of the metal strands 310, 320, 330, 340, 350, 360, 370 is opposite to the twist direction (parent twist direction) of the central bunched strand 31 and the peripheral bunched strands 32-37 in the first and second power lines 3A, 3B, when the first and second power lines 3A, 3B are bent, the metal strands 310 of the central bunched strand 31 and the metal strands 310, 320, 330, The surface pressure at the contact points where 340, 350, 360, and 370 intersect increases, making the wire surface more susceptible to damage. However, in this embodiment, because the twisting directions are the same, the metal wires 310 of the central bunched strand 31 and the metal wires 310, 320, 330, 340, 350, 360, and 370 of the peripheral bunched strands 32 to 37 are more likely to come into line contact, making it less likely that damage will occur to the wire surface due to reduced surface pressure.

By making the twisting directions the same as described above, when the composite cable 2 is twisted around the central axis of the composite cable 2 in the same direction as the twisting direction, the metal wires 310 of the central bunched strand 31 and the metal wires 310, 320, 330, 340, 350, 360, 370 of the peripheral bunched strands 32-37 are strongly pressed against each other, which may reduce the torsional durability. However, in this embodiment, as shown in Figure 1, both ends of the part of the composite cable 2 that is suspended in the air are fixed by the bracket 18 on the vehicle body side and the bracket 19 on the wheel side, respectively, so such twisting does not occur.

In addition, by making each twist direction the same as described above, there is a risk that the composite cable 2 may develop a tendency to bend. However, in this embodiment, this tendency is taken into consideration and the fixing position and fixing direction of the bracket 18 on the vehicle body side and the bracket 19 on the wheel side are adjusted, making it possible to prevent the part of the composite cable 2 suspended in the air from coming into contact with the vehicle components.

(Effects of the embodiment)
As described above, according to the present embodiment, the wire diameter _D10 of each of the multiple metal wires 310 in the central portion bunched strand 31 is smaller than the wire diameter _D20 of each of the multiple metal wires 320, 330, 340, 350, 360, 370 in the peripheral portion bunched strands 32-37, making it possible to increase bendability while suppressing increases in costs.

[Modification of power supply line]
Fig. 5(a) is a cross-sectional view showing a power line 8 according to a first modified example. Fig. 5(b) is a cross-sectional view showing a power line 9 according to a second modified example. In the above embodiment, the first and second power lines 3A and 3B are each composed of seven bunched wires, but in these modified examples, the power lines 8 and 9 are each composed of 19 bunched wires.

The power line 8 shown in FIG. 5(a) has a power line conductor 80 and an insulator 800 that covers the outer periphery of the power line conductor 80. The power line conductor 80 is composed of seven central bunched strands 81 and twelve peripheral bunched strands 82 that surround the central bunched strands. The central bunched strand 81 is composed of multiple metal strands 810 twisted together, and the peripheral bunched strand 82 is composed of multiple metal strands 820 twisted together. The strand diameter of the metal strands 810 of the central bunched strand 81 is smaller than the strand diameter of the metal strands 820 of the peripheral bunched strand 82. The strand diameter of the metal strands 810 of the central bunched strand 81 is 50% to 80% of the strand diameter of the metal strands 820 of the peripheral bunched strand 82.

The power line 9 shown in FIG. 5(b) has a power line conductor 90 and an insulator 900 that covers the outer circumference of the power line conductor 90. The power line conductor 90 is composed of one central bunched strand 91 and 18 peripheral bunched strands 92 that surround it in a double layer. The central bunched strand 91 is composed of multiple metal strands 910 twisted together, and the peripheral bunched strand 92 is composed of multiple metal strands 920 twisted together. The strand diameter of the metal strands 910 of the central bunched strand 91 is smaller than the strand diameter of the metal strands 920 of the peripheral bunched strand 92. The strand diameter of the metal strands 910 of the central bunched strand 91 is 50% to 80% of the strand diameter of the metal strands 920 of the peripheral bunched strand 92.

The materials of the metal strands 810, 820, 910, 920 and the insulators 800, 900 of the power lines 8, 9 are the same as those in the above embodiment. In addition, the twist direction (child twist direction) of the metal strands 810 in the central bunched strand 81 of the power line 8, the twist direction (child twist direction) of the metal strands 820 in the peripheral bunched strand 82, and the twist direction (parent twist direction) of the multiple central bunched strands 81 and the multiple peripheral bunched strands 82 in the power line conductor 80 are the same. Similarly, the twist direction (child twist direction) of the metal strands 910 in the central bunched strand 91 of the power line 9, the twist direction (child twist direction) of the metal strands 920 in the peripheral bunched strand 92, and the twist direction (parent twist direction) of the multiple central bunched strands 91 and the multiple peripheral bunched strands 92 in the power line conductor 90 are the same.

A composite cable constructed using a plurality of power wires 8, 9 according to these modified examples can increase flexibility while suppressing increases in cost, similar to the above embodiment. In other words, if the wire diameter of each of the plurality of metal wires in at least one of the plurality of bunched strands located at the center of the power line conductor is smaller than the wire diameter of each of the plurality of metal wires in the other bunched strands, it is possible to obtain the effect of increasing flexibility while suppressing increases in cost.

[Modifications of the composite cable configuration]
Fig. 6 is a cross-sectional view showing the configuration of a composite cable 2A according to a modified example. In the above embodiment, the twisted pair 40 formed by twisting the first and second signal wires 4A and 4B is covered with the inner sheath 400, and the twisted pair 40 and the inner sheath 400 form the signal line cable 4. In the modified example shown in Fig. 6, the twisted pair 40 is not covered with the inner sheath 400, and the twisted pair 40 is twisted with the first and second power wires 3A and 3B to form the assembly 20A. In addition, the interposer 7 is not disposed between the assembly 20A and the tape member 5. The other configurations are the same as those of the above embodiment, so the same reference numerals as those in Fig. 2 are used and repeated explanations are omitted.

As with the above embodiment, this modified composite cable 2A also makes it possible to increase flexibility while suppressing increases in cost.

(Summary of the embodiment)
Next, the technical ideas grasped from the above-described embodiment and modified examples will be described by using the reference numerals and the like in the embodiment and modified examples. However, the reference numerals and the like in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiment.

[1] A composite cable (2, 2A) having a plurality of power lines (3A, 3B, 8, 9) and a plurality of signal lines (4A, 4B), each of the plurality of power lines (3A, 3B, 8, 9) having a power line conductor (30, 80, 90) and an insulator (300, 800, 900) covering the outer periphery of the power line conductor (30, 80, 90), and the power line conductor (30, 80, 90) is made of a plurality of metal wires (310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 550, 560, 570, 580, 590, 600, 610, 620, 630, 640, 650, 660, 670, 680, 690, 700, 710, 720, 730, 740, 750, 760, 770, 780, 790, 80 ... The power supply line conductor (30, 80, 90) is configured by twisting together a plurality of bunched strands (31-37, 81, 82, 91, 92) each of which is formed by twisting together a plurality of bunched strands (31-37, 81, 82, 91, 92). The plurality of bunched strands (31-37, 81, 82, 91, 92) each have a strand diameter (D ₁₀ ) is smaller than the strand diameter (D20) of each of the plurality of metal strands (320, 330, 340, 350, 360, 370, 820, ₉₂₀ ) of other bunched wires (32-37, 82, 92) surrounding the at least one bunched wire (31, 81, 91) among the plurality of bunched wires (31-37, 81, 82, 91, 92).

[2] The composite cable (2, 2A) according to the above-mentioned [1], wherein a strand diameter ( _D10 ) of the plurality of metal strands (310, 810, 910) of the at least one bunched strand (31, 81, 91) is 80% or less of a strand diameter ( _D20 ) of the plurality of metal strands (320, 330, 340, 350, 360, 370, 820, 920) of the other bunched strands (32-37, 82, 92).

[3] The composite cable (2, 2A) according to [2] above, wherein a strand diameter ( _D10 ) of the plurality of metal strands (310, 810, 910) of the at least one bunched strand (31, 81, 91) is 50% or more of a strand diameter ( _D20 ) of the plurality of metal strands (320, 330, 340, 350, 360, 370, 820, 920) of the other bunched strands (32-37, 82, 92).

[4] The composite cable (2) according to the above-mentioned [1], wherein the power line conductor (30) is formed by twisting together seven of the bunched strands (31-37), and a strand diameter ( _{D10) of the plurality of metal strands (310) of one of the bunched strands (31) located at the center of the power line conductor (30} ) is smaller than a strand diameter ( _D20 ) of the plurality of metal strands (320, 330, 340, 350, 360, 370) of the other six of the bunched strands (32-37).

[5] The composite cable (2, 2A) described in [1] above, in which the twist direction of the plurality of metal wires (310, 320, 330, 340, 350, 360, 370, 810, 820, 910, 920) of the power line conductor (30, 80, 90) is the same as the twist direction of the plurality of bunched strands (31-37, 81, 82, 91, 92).

[6] The composite cable described in [1] above, in which the signal lines (4A, 4B) are twisted together to form a twisted pair (40), and the power lines (3A, 3B, 8, 9) and the twisted pair (40) are twisted together.

[7] The composite cable (2, 2A) described in [6] above, in which the twisting direction of the plurality of power lines (3A, 3B, 8, 9) and the twisted pair wire (40), the twisting direction of the plurality of metal wires (310, 320, 330, 340, 350, 360, 370, 810, 820, 910, 920), and the twisting direction of the plurality of bunched strands (31-37, 81, 82, 91, 92) are the same.

[8] The composite cable (2, 2A) described in [1] to [7] above, in which the plurality of power supply lines (3A, 3B, 8, 9) and the plurality of signal lines (4A, 4B) have one end connected to the vehicle body (11) side and the other end connected to the wheel side (10) of the vehicle.

Although the embodiments and modifications of the present invention have been described above, the above-described embodiments and modifications do not limit the invention as claimed. It should also be noted that not all of the combinations of features described in the embodiments are necessarily essential to the means for solving the problems of the invention.

Reference Signs List 1...vehicle 10...wheel 11...vehicle body 2, 2A...composite cable 30...power line conductors 300, 800, 900...insulators 31-37...bundled stranded wires 310, 320, 330, 340, 350, 360, 370...metal strands 3A, 3B...first and second power lines 40...twisted pair wire 410...metal strands 42...insulators 4A, 4B...second signal line 8, 9...power line 80, 90...power line conductors 81, 91...central bunched stranded wires 810, 820, 910, 920...metal strands 82, 92...peripheral bunched stranded wires _D10 , _D20 ...strand diameter

Claims (8)

A composite cable having a plurality of power lines and a plurality of signal lines,
Each of the plurality of power lines includes a power line conductor and an insulator that covers an outer periphery of the power line conductor,
the power supply line conductor is configured by twisting together a plurality of bunched strands each made by twisting together a plurality of metal wires,
a wire diameter of each of the multiple metal wires of at least one of the multiple bunched strands located at a center of the power line conductor is smaller than a wire diameter of each of the multiple metal wires of other bunched strands surrounding the at least one bunched strand among the multiple bunched strands,
Composite cable. a wire diameter of the metal wires of the at least one bunched strand is 80% or less of a wire diameter of the metal wires of the other bunched strands;
The composite cable of claim 1. a wire diameter of the metal wires of the at least one bunched strand is 50% or more of a wire diameter of the metal wires of the other bunched strands;
The composite cable of claim 2. the power supply line conductor is formed by twisting together seven of the bunched stranded wires,
a strand diameter of the metal strands of one of the bunched strands located at a center of the power line conductor is smaller than strand diameters of the metal strands of the other six of the bunched strands;
The composite cable of claim 1. The power line conductor has a twist direction of the plurality of metal strands and a twist direction of the plurality of bunched strands that are the same.
The composite cable of claim 1. the plurality of signal lines are twisted together to form a twisted pair;
The plurality of power lines and the twisted pair wire are twisted together.
The composite cable of claim 1. the twisting direction of the plurality of power wires and the twisted pair wire is the same as the twisting direction of the plurality of metal wires and the twisted pair wire; and
The composite cable of claim 6. One end of each of the plurality of power supply lines and the plurality of signal lines is connected to a vehicle body side of the vehicle, and the other end of each of the plurality of power supply lines and the plurality of signal lines is connected to a wheel side of the vehicle.
A composite cable according to any one of claims 1 to 7.

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