JP2019125489A - Electric wire and cable - Google Patents

Abstract

To provide an electric wire and a cable, which are capable of improving bending durability of a conductor.SOLUTION: An electric wire includes a conductor 2 composed of a plurality of conductor wires 2a, and an insulating layer 3 disposed on an outer periphery of the conductor 2. A hollow part S is disposed between the conductor 2 and the insulating layer 3. The conductor 2 is not in contact with the insulating layer 3 in the electric wire 1 when matching a center of the conductor 2 with a center of the hollow part S in a cross-sectional view.SELECTED DRAWING: Figure 3

Description

  The present invention relates to electric wires and cables used, for example, in automobiles.

  In recent years, electrically driven braking devices are being widely used in automobiles. As an electric braking device, an electro-mechanical brake (EMB) and an electric parking brake (EPB) are known. The EMB and the EPB operate by supplying current through a cable wired from a vehicle-body-side device provided in the vehicle body to a wheel-side device provided in the wheel.

  As a cable used for EMB and EPB, there is a cable as described in Patent Document 1, for example. The cable described in Patent Document 1 is provided on a periphery of a plurality of electric wires including a plurality of electric wires having a conductor formed of a plurality of conductor wires and an insulating layer provided in contact with the entire periphery of the conductor. And the sheath layer being

JP, 2017-201579, A

  By the way, the cable used for EMB and EPB is repeatedly bent by the up-and-down movement (bound and rebound) of the wheel and the side-to-side movement (steering) of the wheel during traveling. For this reason, the cable used in EMB and EPB is required to have an improvement in durability (flexing durability) against repeated bending of the conductor constituting the electric wire.

  Then, this invention is made in view of the said situation, and it aims at provision of the electric wire and cable which can improve the bending | flexion durability of a conductor.

  In order to solve the above-mentioned subject, the present invention has a conductor formed of a plurality of conductor strands, and an insulating layer provided on the outer periphery of the conductor, and the conductor and the insulating layer And a hollow portion is provided, and the electric conductor and the insulating layer do not contact when the center of the conductor and the center of the hollow portion coincide with each other in a cross sectional view.

  In addition, the present invention has a first conductor formed of a plurality of conductor strands and a first insulating layer provided on the outer periphery of the first conductor, for the purpose of solving the above-mentioned problems. A plurality of first electric wires and a sheath provided on the outer periphery of the plurality of first electric wires are provided, and a hollow portion is provided between the first conductor and the first insulating layer. There is provided a cable in which the first conductor and the first insulating layer do not contact when the center of the first conductor and the center of the hollow portion coincide with each other in a sectional view.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the electric wire and cable which can improve the bending | flexion durability of a conductor.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the structure of the vehicle using the cable 10 which has the electric wire (1st electric wire 1) which concerns on embodiment of this invention. It is a sectional view of cable 10 which has an electric wire (the 1st electric wire 1) concerning an embodiment of the invention. It is an expanded sectional view of the electric wire (the 1st electric wire 1) concerning an embodiment of the invention. It is an expanded sectional view when the center of the 1st conductor 2 of the electric wire (1st electric wire 1) which concerns on embodiment of this invention, and the center of hollow part S are made to correspond. (A) It is sectional drawing of the conventional electric wire. (B) It is sectional drawing at the time of the conventional electric wire bending. It is sectional drawing at the time of the electric wire (1st electric wire 1) which concerns on this Embodiment being bent.

Embodiment
Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

<Description of the vehicle to which the cable 10 is applied>
FIG. 1 is a block diagram showing a configuration of a vehicle using a cable 10 having a wire (first wire 1) according to the present embodiment.

  As shown in FIG. 1, a vehicle 100 is provided with an electric parking brake (hereinafter referred to as EPB) 101 as an electric braking device.

  The EPB 101 includes an EPB electric motor 101 a and an EPB control unit 101 b.

  The EPB electric motor 101 a is a wheel-side device mounted on the wheel 102 of the vehicle 100. The EPB control unit 101 b is mounted on an ECU (Electronic Control Unit) 103 which is a vehicle body side device mounted on a vehicle body 105 of the vehicle 100. The EPB control unit 101b may be mounted on a control unit other than the ECU 103, or may be mounted on a dedicated hardware unit.

  Although not shown, the EPB electric motor 101a is provided with a piston to which a brake pad is attached. The piston is moved by the rotational drive of the EPB electric motor 101a. The EPB 101 is configured such that when the piston moves, the brake pad is pressed against the disc rotor of the wheel 102 and a braking force is generated on the wheel 102. A pair of first electric wires 1 (electric wires according to the present embodiment) is connected to the EPB electric motor 101a as a power supply line for supplying a drive current to the EPB electric motor 101a.

  The EPB control unit 101b outputs a drive current to the EPB electric motor 101a for a predetermined time (for example, 1 second) when the parking brake operation switch 101c is operated from the off state to the on state when the vehicle 100 is stopped. The brake pad is pressed against the disk rotor of the wheel 102, and the wheel 102 is configured to generate a braking force. The EPB control unit 101b also outputs a driving current to the EPB electric motor 101a when the parking brake operation switch 101c is operated from the on state to the off state, or when the accelerator pedal is depressed. The pad is configured to be separated from the wheel disc rotor to release the braking force on the wheel 102. That is, the operating state of the EPB 101 is configured to be maintained until the parking brake operating switch 101c is turned off or the accelerator pedal is depressed after the parking brake operating switch 101c is turned on. The parking brake operating switch 101c may be a lever type or pedal type switch.

  Further, an ABS device 104 is mounted on the vehicle 100. The ABS device 104 includes an ABS sensor 104a and an ABS control unit 104b.

  The ABS sensor 104 a is a rotational speed detection sensor that detects the rotational speed of the running wheel 102, and is mounted on the wheel 102. The ABS control unit 104 b controls the braking system based on the output of the ABS sensor 104 a so as to prevent the wheel 102 from being locked at the time of a sudden stop, and controls the braking force of the wheel 102. A pair of second electric wires 6 is connected to the ABS sensor 104a as a signal line.

  A cable 10 is obtained by collectively covering the first electric wire 1 and the second electric wire 6 with a sheath 5 (see FIG. 2). The cable 10 extended from the wheel 102 side is connected to the wire group 107 in the relay box 106 provided on the vehicle body 105, and is connected to the ECU 103 and a battery (not shown) via the wire group 107.

  Although only one wheel 102 is shown in FIG. 1 for simplification of the drawing, the EPB electric motor 101a and the ABS sensor 104a may be mounted on each wheel 102 of the vehicle 100, for example, It may be mounted only on the front wheels of the vehicle 100 or only on the rear wheels.

<Description of Cable 10>
FIG. 2 is a cross-sectional view of a cable 10 having a wire (first wire 1) according to the embodiment of the present invention. FIG. 3: is an expanded sectional view of the electric wire (1st electric wire 1) which concerns on embodiment of this invention. FIG. 4: is an expanded sectional view at the time of making the center of the 1st conductor 2 of the electric wire (1st electric wire 1) which concerns on embodiment of this invention, and the center of hollow part S correspond. In addition, in this specification, a "cross section" is a cross section at the time of cut | disconnecting in the direction orthogonal to the longitudinal direction of the cable 10. FIG.

  As shown in FIG. 2, the cable 10 includes a pair of first electric wires 1, a pair of second electric wires 6, and a sheath 5 provided on the outer periphery of the pair of first electric wires 1 and the pair of second electric wires 6. ,have. Further, the sheath 5 is spirally wound in contact with the outer periphery of the pair of first electric wires 1 and the pair of second electric wires 6 between the sheath 5 and the pair of first electric wires 1 and the pair of second electric wires 6. A tape member 4 is provided.

  In the present embodiment, the pair of first electric wires 1 is a power supply line for supplying a driving current to the electric motor 101 a for the EPB 101 mounted on the wheel 102 of the vehicle 100. Further, in the present embodiment, the pair of second electric wires 6 are signal lines for the ABS sensor 104 a mounted on the wheel 102.

(1st wire 1)
The 1st electric wire 1 has the 1st conductor 2 and the 1st insulating layer 3 provided in the perimeter of the 1st conductor 2, as shown in FIG.

As shown in FIG. 3, the first conductor 2 is formed of a plurality of conductor strands 2a. More specifically, the first conductor 2 is formed of a plurality of (seven in the present embodiment) child strands formed by twisting a plurality of conductor strands 2a. The first conductor 2 is formed of a single stranded strand formed by further twisting the plurality of child stranded wires. In the present embodiment, the child stranded wire is formed by collective twisting, and the parent stranded wire is formed by concentric twisting. In the present embodiment, the diameter of the first conductor 2, that is, the diameter of a circle C (circle drawn by a broken line in FIG. 4) formed by the plurality of conductor strands 2a is about 1.8 mm. In this case, the area of the circle C is about 2.5 mm ² . In the present embodiment, since the first conductor 2 is formed by concentric twisting a plurality of child stranded wires, the circle C is a circle that is in contact with the outer periphery of the plurality of child stranded wires.

  The conductor wire 2a is made of a metal of good conductivity such as copper or aluminum. More specifically, the conductor wire 2a is made of a soft wire, a silver-plated soft wire, a hard copper wire, a tin-plated soft wire, a copper alloy wire, a tin-plated copper alloy wire, a tin-containing copper alloy wire or the like. The conductor wire 2a preferably has a conductor diameter of 0.01 mm or more and 0.30 mm or less. When the conductor diameter of the conductor wire 2a is less than 0.01 mm, sufficient mechanical strength can not be obtained, and the bending durability may be reduced. In addition, when the conductor diameter of the conductor wire 2a is larger than 0.30 mm, the flexibility of the first electric wire 1 may be reduced, and furthermore, the flexibility of the cable 10 having the first electric wire 1 may be reduced. .

  The first insulating layer 3 is made of insulating resin and is provided on the outer periphery of the first conductor 2. More specifically, the first insulating layer 3 is provided on the outer periphery of the first conductor 2 so as to cover the entire outer periphery of the first conductor 2. That is, the first insulating layer 3 is formed in a cylindrical shape covering the first conductor 2. The first insulating layer 3 preferably has a Shore D hardness of 35 or more and 85 or less. In the present embodiment, the first insulating layer 3 is made of crosslinked polyethylene (XLPE). In addition, as the first insulating layer 3, an insulating resin such as polyethylene, tetrafluoroethylene-ethylene copolymer (ETFE), or a fluorine resin can be used. The first insulating layer 3 preferably has a thickness of 0.2 mm or more and 3.0 mm or less. If the thickness of the first insulating layer 3 is less than 0.2 mm, the insulation may be degraded. In addition, when the thickness of the first insulating layer 3 is larger than 3.0 mm, the flexibility of the first electric wire 1 may be reduced, and furthermore, the flexibility of the cable 10 having the first electric wire 1 may be reduced. is there.

  Here, as shown in FIG. 2 and FIG. 3, the hollow portion S is provided in the first electric wire 1. More specifically, a hollow portion S is provided between the first conductor 2 and the first insulating layer 3 in the first electric wire 1. By so doing, it becomes possible to improve the bending durability of the first conductor 2 in the first electric wire 1 as described later with reference to FIGS.

  The hollow portion S is formed inside the cylindrical first insulating layer 3 and is formed in a circular shape in cross section. The first electric wire 1 has a hollow portion S between the first conductor 2 and the first insulating layer 3 by inserting the first conductor 2 into the first insulating layer 3 formed in advance in a cylindrical shape by extrusion molding or the like. Are formed in the state provided. In the present embodiment, the first conductor 2 is disposed in the hollow portion S so as to be in contact with the first insulating layer 3, and as shown in FIG. 3, in the normal state, the first conductor 2 is 2 is in contact with the first insulating layer 3 by its own weight.

  As described above, the first conductor 2 is disposed in the hollow portion S so as to be in contact with the first insulating layer 3, but as shown in FIG. When the center of the portion S is aligned, the first conductor 2 and the first insulating layer 3 are not in contact with each other. At this time, the distance D from the first conductor 2 (circle C) to the inner surface 3a of the first insulating layer 3 is preferably 0.05 mm or more and 5.0 mm or less. That is, the ratio of the area of the circle C to the cross-sectional area of the hollow portion S (the area of the circle C / the cross-sectional area of the hollow portion S) is preferably 0.02 or more and 0.90 or less. When the distance D from the first conductor 2 to the inner surface 3a of the first insulating layer 3 is less than 0.05 mm, when the first electric wire 1 is bent, the first insulating layer 3 is on the outer periphery of the first conductor 2 in cross section. There is a possibility that the contacting part may be large. Moreover, when the distance D from the 1st conductor 2 to the inner surface 3a of the 1st insulating layer 3 is larger than 5.0 mm, there exists a possibility that the diameter of the 1st electric wire 1 may be enlarged. In addition, since the first conductor 2 and the first insulating layer 3 can move relative to each other in cross sectional view, when the distance D from the first conductor 2 to the inner surface 3a of the first insulating layer 3 is larger than 5.0 mm, When the first electric wire 1 vibrates due to the vibration of the vehicle 100, the first conductor 2 and the inner surface 3a of the first insulating layer 3 may strongly collide with each other. In addition, while suppressing the possibility that the part in which the 1st insulating layer 3 contacts the perimeter of the 1st conductor 2 becomes large in a cross sectional view from a viewpoint of controlling a diameter increase of the 1st electric wire 1 more, It is more preferable that the distance D between 2 and the inner surface 3a of the first insulating layer 3 be 0.1 mm or more and 1.3 mm or less. That is, the ratio of the area of the circle C to the cross-sectional area of the hollow portion S (the area of the circle C / the cross-sectional area of the hollow portion S) is preferably 0.16 or more and 0.80 or less.

  Here, the meaning of “providing the hollow portion S between the first conductor 2 and the first insulating layer 3” will be described below with reference to FIGS. Fig.5 (a) is sectional drawing of the conventional electric wire 21, FIG.5 (b) is sectional drawing at the time of the conventional electric wire bending. FIG. 6 is a cross-sectional view when the first electric wire 1 according to the present embodiment is bent.

  First, the conventional electric wire 21 will be described with reference to FIG. 5 (a). The electric wire 21 has a conductor 22 composed of a plurality of conductor strands 22 a and an insulating layer 23 provided in contact with the entire outer periphery of the conductor 22. The conductor 22 is formed by further twisting a plurality of child stranded wires formed by twisting a plurality of conductor strands 22a, as in the present embodiment.

  When the electric wire 21 is bent, as shown in FIG. 5B, the insulating layer 23 is deformed. In the structure of the conventional electric wire 21 illustrated in FIG. 5A, the deformation of the insulating layer 23 when the electric wire 21 is bent is considered to be minute, but in FIG. 5B, the insulating layer 23 is The deformation of the is exaggerated.

  When the insulating layer 23 is deformed by the bending of the electric wire 21, as shown in FIG. 5B, since the insulating layer 23 is provided in contact with the entire outer periphery of the conductor 22, the pressure from the insulating layer 23 to the conductor 22 is P is applied. For this reason, each time the electric wire 21 is bent, the plurality of conductor strands 22a rub against each other in a state where the pressure P is applied to the conductor 22. Therefore, when the electric wire 21 is repeatedly bent, the plurality of conductor strands 22 a are worn, which leads to a decrease in bending durability of the conductor 22.

  On the other hand, as shown in FIG. 4, the first electric wire 1 according to the present embodiment is provided with the hollow portion S between the first conductor 2 and the first insulating layer 3, and the first electric wire 1 in the cross sectional view When the center of the conductor 2 matches the center of the hollow portion S, the first conductor 2 and the first insulating layer 3 are not in contact with each other. With such a configuration, as shown in FIG. 6, when the first electric wire 1 is bent, the first insulating layer 3 is deformed in a shape that has a smaller number of portions contacting the outer periphery of the conductor than the conventional electric wire 21 in cross section. Do. For this reason, even if the first insulating layer 3 is deformed by the bending of the first electric wire 1, the pressure applied from the first insulating layer 3 to the first conductor 2 is relaxed by the space S more than in the prior art. Therefore, even if the first electric wire 1 is repeatedly bent, the wear of the plurality of conductor strands 22a is suppressed, which leads to the improvement of the bending durability of the first conductor 2.

(Second wire 6)
The 2nd electric wire 6 has the 2nd conductor 7 and the 2nd insulating layer 8 provided in the perimeter of the 2nd conductor 7, as shown in FIG.

The second conductor 7 is formed by twisting a plurality of conductor strands (not shown). In the present embodiment, the second conductor 7 has a diameter smaller than that of the first conductor 2 and is formed to be about 1.0 mm. At this time, the cross-sectional area of the second conductor 7 is about 0.79 mm ² , which is smaller than the cross-sectional area of the circle C in the first conductor 2.

  The conductor wire that forms the second conductor 7 is, like the first conductor 2, made of a good metal such as copper or aluminum, and more specifically, soft conductor, silver-plated soft conductor, hard copper wire, tin-plated soft Conductor, copper alloy wire, tin-plated copper alloy wire, tin-containing copper alloy wire, etc. Moreover, it is preferable that the conductor diameter also consists of a thing of 0.01 mm or more and 0.30 mm or less similarly to the 1st conductor 2.

  The second insulating layer 8 is made of insulating resin and is provided on the outer periphery of the second conductor 7. More specifically, the second insulating layer 8 is provided on the outer periphery of the second conductor 7 in contact with the entire outer periphery of the second conductor 7 by, for example, extrusion molding. That is, no hollow portion is provided between the second conductor 7 and the second insulating layer 8 in the second electric wire 6. In the present embodiment, the second insulating layer 8 is made of crosslinked polyethylene (XLPE) as in the case of the first insulating layer 3. In addition, as with the first insulating layer 3, polyethylene, tetrafluoroethylene-ethylene copolymer (ETFE), fluorocarbon resin, etc. can be used as the second insulating layer 8.

  The pair of second electric wires 6 are twisted together, and the pair of second electric wires 6 twisted together are twisted together with the pair of first electric wires 1.

(Tape member 4)
The tape member 4 is provided on the outer periphery of the pair of first electric wires 1 and the pair of second electric wires 6. Further, the tape member 4 covers the pair of first electric wires 1 and the pair of second electric wires 6 at one time, and is in contact with the pair of first electric wires 1 and the pair of second electric wires 6. The tape member 4 is made of non-woven fabric, paper, resin or the like. The tape member 4 has a role of suppressing the frictional resistance between the sheath 5 and the pair of first electric wires 1 and the pair of second electric wires 6. That is, the tape member 4 is provided between the sheath 5 and the pair of first electric wires 1 and the pair of second electric wires 6 so that the pair of first electric wires 1 and the pair of second electric wires 6 It becomes easy to move relative.

  The tape member 4 is spirally wound around the outer circumference of the pair of first electric wires 1 and the pair of second electric wires 6 along the longitudinal direction of the cable 10. In the present embodiment, the winding direction of the tape member 4 is opposite to the twisting direction of the twisting unit formed by twisting the pair of second electric wires 6 and the pair of first electric wires 1 twisted together. .

(Sheath 5)
The sheath 5 is made of an insulating resin, and is provided on the outer periphery of the pair of first electric wires 1 and the pair of second electric wires 6. The sheath 5 is provided in contact with the entire outer periphery of the tape member 4 by, for example, extrusion molding. The sheath 5 is made of urethane, ethylene propylene diene rubber or the like. In the present embodiment, the cross-sectional shape of the sheath 5 is circular.

[Operation and effect of the embodiment]
(1) In the electric wire (the first electric wire 1) according to the present embodiment, the hollow portion S is provided between the first conductor 2 and the first insulating layer 3 and the center of the first conductor 2 in cross section The first conductor 2 and the first insulating layer 3 are not in contact with each other when the center of the hollow portion S coincides with the center of the hollow portion S. Thereby, even if the first insulating layer 3 is deformed due to the bending of the first electric wire 1, the pressure applied from the first insulating layer 3 to the first conductor 2 is relaxed by the space S more than in the prior art. Therefore, even if the first electric wire 1 is repeatedly bent, the wear of the plurality of conductor strands 22a is suppressed, which leads to the improvement of the bending durability of the first conductor 2.

(2) In the cable 10, the hollow portion S is provided in the first electric wire 1, but the hollow portion is not provided in the second electric wire 6. Since the second conductor 7 has a diameter smaller than that of the first conductor 2, when the same conductor wire as the first conductor 2 is used, bending durability is generally higher than that of the first conductor 2. Therefore, the hollow portion S is provided only between the first conductor 2 and the first insulating layer 3, and the second conductor 7 and the second insulating layer 8 having a smaller diameter and higher bending durability than the first conductor 2 are provided. There is no hollow in between. Thereby, the bending durability of the first conductor 2 can be improved, and the second electric wire 6 can be manufactured by extruding the second insulating layer 8 on the outer periphery of the second conductor 7, so that the manufacturing process Simplification of is possible.

(3) In the cable 10, the winding direction of the tape member 4 is opposite to the twisting direction of the twisting combination in which the pair of second electric wires 6 and the pair of first electric wires 1 twisted together are twisted together. There is. As a result, when the sheath 5 is extruded and formed on the outer periphery of the tape member 4, the sheath 5 is formed between the pair of first electric wires 1 and the pair of first electric wires 1 and the pair of second electric wires by resin pressure of extrusion molding. It becomes possible to suppress entering between the wire 6 and the wire 6. As a result, when the sheath 5 is formed by extrusion on the outer periphery of the tape member 4, it is possible to reduce the crushing of the first insulating layer 3 due to the resin pressure of extrusion molding, and the bending of the first conductor 2 in the cable 10 It is possible to further improve the durability.

[Modification]
(1) In the above embodiment, the first conductor 2 is disposed in the hollow portion S so as to be in contact with the first insulating layer 3, but a press-wound tape or the like wound around the outer periphery of the first conductor 2 The first conductor 2 may be disposed in the hollow portion S in a state in which the first conductor 2 can not be in contact with the first insulating layer 3 due to the intervening portion. In this case, when the center of the first conductor 2 and the center of the hollow portion S coincide with each other in cross sectional view, it is preferable that the intervening portion and the first insulating layer 3 not be in contact with each other. By doing in this way, it is suppressed that the 1st insulating layer 3 (especially inner surface 31 of the 1st insulating layer 3) is worn out by the 1st conductor 2 and the 1st insulating layer 3 rubbing. It is possible.

(2) Between the tape member 4 and the pair of first electric wires 1 and the pair of second electric wires 6, it is also possible to provide inclusions composed of a plurality of linear bodies or the like. By providing the inclusions, the cross-sectional shape of the cable 10 can be easily formed into a circular shape. Furthermore, when the sheath 5 is formed by extrusion on the outer periphery of the tape member 4, crushing of the first insulating layer 3 due to the resin pressure of extrusion molding can be further reduced.

(3) It is also possible to provide a hollow portion between the second conductor 7 of the second electric wire 6 and the second insulating layer 8. This makes it possible to further improve the bending durability of the cable 10.

(4) In the above embodiment, in the cable 10, the pair of second electric wires 6 are twisted together, and the pair of second electric wires 6 twisted together are twisted together with the pair of first electric wires 1 ing. However, the present invention is not limited to this, and the cable 10 may not include the pair of second electric wires 6 and may be formed of the pair of first electric wires 1. In this case, it is preferable that the pair of first electric wires 1 be twisted together.

(5) The first electric wire 1 is applicable not only to the EPB but also to a power supply line such as an electromechanical brake (EMB) or an in-hole motor (IWM).

[Summary of the embodiment]
Next, technical ideas to be understood from the embodiments described above will be described by using the reference numerals and the like in the embodiments. However, each reference numeral or the like in the following description does not limit the constituent elements in the claims to the members or the like specifically shown in the embodiments.

[1] A conductor (first conductor 2) formed of a plurality of conductor strands (2a), and an insulating layer (first insulating layer 3) provided on the outer periphery of the conductor (first conductor 2) , And a hollow portion (S) is provided between the conductor (first conductor 2) and the insulating layer (first insulating layer 3), and the conductor (first conductor) in a sectional view The electric wire (1) which the said conductor (1st conductor 2) and the said insulating layer (1st insulating layer 3) do not contact, when making the center of 2) and the center of the said hollow part (S) correspond.

[2] From the conductor (first conductor 2) to the insulating layer (first insulating layer) when the center of the conductor (first conductor 2) matches the center of the hollow portion (S) in a cross sectional view The electric wire (1) as described in [1] whose distance (D) to the inner surface (3a) of 3) is 0.05 mm or more and 5.0 mm or less.

[3] The electric wire (1) according to [1] or [2], wherein the Shore D hardness of the insulating layer is 35 or more and 85 or less.

[4] The electric wire (1) according to any one of [1] to [3], wherein the insulating layer (first insulating layer 3) is made of any of polyethylene, crosslinked polyethylene, urethane, polypropylene, and fluorine resin. .

[5] Any one of [1] to [4], wherein the conductor (first conductor 2) is a master strand wire in which a child strand wire in which the plurality of conductor strands (2a) are twisted is further twisted Wires described in (1).

[6] A plurality having a first conductor (2) formed of a plurality of conductor strands (2a) and a first insulating layer (3) provided on the outer periphery of the first conductor (2) A first electric wire (1) and a sheath (5) provided on the outer periphery of the plurality of first electric wires (1), the first conductor (2) and the first insulating layer (3) And a hollow portion (S) between the first conductor (2) and the hollow portion (S) in cross section. Cable (10) in which a conductor (2) and said 1st insulating layer (3) do not contact.

[7] It has a tape member (4) wound around the outer circumference of the plurality of first electric wires (1) and disposed between the plurality of first electric wires (1) and the sheath (5) , The cable described in [6].

[8] The plurality of first electric wires (1) are twisted together, and the tape member (4) is spirally wound around the outer periphery of the plurality of first electric wires (1), and the plurality of first electric wires (1) are wound. The cable according to [7], wherein the twisting direction of the first electric wire (1) and the winding direction of the tape member (4) are opposite to each other.

[9] Further, a second conductor (7) having a diameter smaller than that of the first conductor (2) formed of a plurality of conductor strands, and a second conductor (7) provided on the outer periphery of the second conductor (7) A plurality of second electric wires (6) having two insulating layers (8), and a hollow portion is provided between the second conductor (7) and the second insulating layer (8) Not, The cable in any one of [6] thru | or [8].

DESCRIPTION OF SYMBOLS 1 1st electric wire 2 1st conductor 2a Conductor wire 3 1st insulating layer 3a Inner surface 4 Tape member 5 Sheath 6 2nd wire 7 2nd conductor 8 2nd insulation layer 10 Cable S Hollow part C By a plurality of conductor wires 2a The circle D formed The distance from the first conductor 2 to the inner surface 3a of the first insulating layer

Claims (9)

A conductor formed of a plurality of conductor strands,
An insulating layer provided on the outer periphery of the conductor;
Have
A hollow portion is provided between the conductor and the insulating layer,
When making the center of the conductor and the center of the hollow portion coincide in cross sectional view, the conductor and the insulating layer do not contact each other. The distance from the conductor to the inner surface of the insulating layer is 0.05 mm or more and 5.0 mm or less when the center of the conductor and the center of the hollow portion coincide with each other in a cross sectional view.
The electric wire according to claim 1. The Shore D hardness of the insulating layer is 35 or more and 85 or less.
The electric wire according to claim 1 or 2. The insulating layer is made of any of polyethylene, cross-linked polyethylene, urethane, polypropylene and fluorine resin.
The electric wire according to any one of claims 1 to 3. The conductor comprises a parent strand wire in which a plurality of child strand wires into which the plurality of conductor strands are twisted are further twisted.
The electric wire according to any one of claims 1 to 4. A plurality of first electric wires having a first conductor formed of a plurality of conductor strands and a first insulating layer provided on an outer periphery of the first conductor;
A sheath provided on an outer periphery of the plurality of first electric wires;
Have
A hollow portion is provided between the first conductor and the first insulating layer,
The cable in which the said 1st conductor and the said 1st insulating layer do not contact when the center of the said 1st conductor and the center of the said hollow part are made to correspond in a cross sectional view. It has a tape member which is wound around the outer circumference of the plurality of first electric wires, and is disposed between the plurality of first electric wires and the sheath.
The cable according to claim 6. The plurality of first electric wires are twisted together,
The tape member is spirally wound around the outer circumferences of the plurality of first electric wires.
The twisting direction of the plurality of first electric wires and the winding direction of the tape member are reverse directions,
The cable according to claim 7. Furthermore, a plurality of second electric wires having a second conductor smaller in diameter than the first conductor formed of a plurality of conductor strands and a second insulating layer provided on the outer periphery of the second conductor Have
No hollow portion is provided between the second conductor and the second insulating layer.
A cable according to any of claims 6-8.

Images