WO2018180603A1

WO2018180603A1 - Wire harness

Info

Publication number: WO2018180603A1
Application number: PCT/JP2018/010491
Authority: WO
Inventors: 武史清水; 裕隆馬場
Original assignee: 株式会社オートネットワーク技術研究所; 住友電装株式会社; 住友電気工業株式会社
Priority date: 2017-03-27
Filing date: 2018-03-16
Publication date: 2018-10-04
Also published as: JP2018163840A

Abstract

A coaxial electrical wire (20) for this wire harness comprises: a center conductor (21) located at the center; an outer conductor (23) provided outside and coaxially with the center conductor (21) and insulated from the center conductor (21); and a cylindrical protective member (26) provided outside and coaxially with the center conductor (21) and consisting of insulative reinforcement fibers.

Description

Wire harness

The present invention relates to a wire harness.

A vehicle such as a hybrid vehicle or an electric vehicle includes a motor that is a power source for driving the vehicle, an inverter connected to the motor, and a high-voltage battery that supplies power to the inverter. The inverter and the high-voltage battery are positive and negative. Are connected to each other by a wire harness including the two high-voltage conductors (see, for example, Patent Documents 1 and 2).

In such a wire harness, for example, a central conductor that works as one of a positive pole conductor and a negative pole conductor, and a positive pole conductor and a negative pole conductor provided outside the center conductor in a state insulated from the central conductor. A cylindrical outer conductor serving as the other. That is, the plus pole conductor and the minus pole conductor are arranged coaxially (concentrically). Space saving is achieved by such a configuration.

In other wire harnesses, for example, a high-voltage conductor and a low-voltage conductor are arranged coaxially to save space.

JP 2012-151056 A JP 2014-35964 A

By the way, in the above wire harness, there exists a possibility of the short circuit of the conductors arrange | positioned coaxially (concentric circle) by the impact at the time of a vehicle collision.
This invention is made | formed in order to solve the said subject, Comprising: The objective is to provide the wire harness which can suppress the short circuit of conductors.

A wire harness that solves the above problems, a central conductor located in the center, an outer conductor that is located outside the central conductor, coaxially with the central conductor, and insulated from the central conductor; A cylindrical protection member that is at least outside the central conductor and is coaxial with the central conductor and made of insulating reinforcing fibers.

According to this configuration, the cylindrical protective member made of insulating reinforcing fibers is provided at least outside the central conductor, so that the impact resistance is improved, and as a result, between the central conductor and the outer conductor. Short circuit, that is, short circuit between conductors can be suppressed.

In the wire harness, it is preferable that the protective member is provided outside the outer conductor.
According to this configuration, the protective member is provided outside the outer conductor, thereby preventing the outer conductor from being exposed to the outside and preventing the outer conductor from being damaged.

In the wire harness, the outer conductor is a braided member formed by braiding conductive wires, and the outer conductor is inserted through the gap between the strands constituting the outer conductor. It is preferable that the conductor and the central conductor are branched.

According to this configuration, the center conductor and the outer conductor can be branched by inserting the center conductor through the gap between the strands of the outer conductor made of the braided member (that is, leading out through the gap).
In the wire harness, the outer conductor is a braided member formed by braiding conductive wires, and the outer peripheral portion on the end side in the longitudinal direction of the outer conductor is insulated with a hard pipe interposed therebetween. It is preferable that it is covered with a covering material.

According to this configuration, the outer peripheral portion of the outer conductor on the side in the longitudinal direction is covered with the insulating covering material with the hard pipe interposed. Here, since the outer conductor made of a braided member has flexibility, it is easy to be deformed when other members are fitted from the outside, and it is difficult to realize a waterproof structure by molding a connector part, a rubber tube, or the like. . In this respect, by providing a hard pipe between the covering material and the outer conductor, a predetermined outer shape can be maintained by the hard pipe, in other words, deformation of the outer conductor can be suppressed. Therefore, it is possible to achieve a waterproof structure by molding the connector part, rubber tube, or the like.

The wire harness preferably has an electromagnetic shield member that is located on the same axis as the center conductor and is provided outside the center conductor and the outer conductor, and is formed of a tubular braided member.

According to this configuration, the wire harness is provided coaxially with the center conductor, provided outside the center conductor and the outer conductor, and has an electromagnetic shield member made of a tubular braided member. Thereby, electromagnetic waves generated by energizing the central conductor and the outer conductor can be prevented from leaking to the outside. Here, for example, when the voltage applied to the center conductor and the outer conductor is relatively high, noise may be exerted on the low-voltage wire, but the electromagnetic shield member is provided as described above. Thus, electromagnetic shielding is achieved and leakage of electromagnetic waves that cause noise to the outside can be suppressed.

According to the wire harness of the present invention, a short circuit between conductors can be suppressed.

1 is a schematic configuration diagram of a vehicle according to an embodiment. The schematic block diagram of the coaxial electric wire of the wire harness of the same form. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. Explanatory drawing for demonstrating the edge part process structure of the coaxial wire of the form. Explanatory drawing for demonstrating the edge part process structure of the coaxial wire of the form.

Hereinafter, an embodiment of a wire harness will be described with reference to the drawings. In each drawing, a part of the configuration may be exaggerated or simplified for convenience of explanation. Further, the dimensional ratio of each part may be different from the actual one.

A vehicle V shown in FIG. 1 includes a high voltage battery 11 and an inverter 12 that are electrically connected by a wire harness 10. In this example, an inverter 12 is provided at the front of the vehicle V, and a high voltage battery 11 is provided at the rear of the vehicle V. For example, the wire harness 10 is routed so as to pass under the floor of the vehicle. The inverter 12 is connected to a wheel driving motor (not shown) serving as a power source for vehicle travel, generates AC power from DC power of the high voltage battery 11, and supplies the AC power to the motor. The high voltage battery 11 is a battery capable of supplying a voltage of several hundred volts.

As shown in FIGS. 1 and 2, the wire harness 10 includes a coaxial wire 20 and connector portions C1 and C2 (only C1 is shown in FIG. 2) provided at both ends of the coaxial wire 20. In addition, it is good also as a structure provided with the exterior member (protection member) which does not illustrate which covers the outer periphery of the coaxial cable 20, and accommodates and protects. Here, a metal or resin pipe material, a corrugated tube, etc. are employable as an exterior member.

As shown in FIG. 3, the coaxial cable 20 includes a center conductor 21, a first coating 22, an outer conductor 23, a second coating 24, an electromagnetic shield member 25, a protection member 26, and a third coating 27. Have

The center conductor 21 is arranged at the approximate center of the coaxial cable 20 and is constituted by a single substantially cylindrical conductor. The center conductor 21 is made of, for example, aluminum or an aluminum alloy. The center conductor 21 of this example is connected to, for example, the plus terminal of the high voltage battery 11 and functions as a plus pole conductor. The outer side of the center conductor 21 is covered with a first coating 22.

The first coating 22 is insulative and is in close contact with the outer peripheral surface of the center conductor 21 by, for example, shrinking a heat-shrinkable tube with heat. An outer conductor 23 is provided outside the first coating 22.

The outer conductor 23 is a cylindrical braided member that is arranged coaxially with the central conductor 21 and is configured by braiding conductive wires. Since the outer conductor 23 is a tubular braided member, for example, when compressed in the axial direction (longitudinal direction), the diameter increases, and when pulled to both sides in the axial direction, the diameter decreases. Thereby, it is possible to attach the first coating 22 so as to be in close contact with the first coating 22 while facilitating the insertion of the first coating 22.

Further, the outer conductor 23 is connected to, for example, the negative terminal of the high voltage battery 11 and functions as a negative electrode conductor. That is, the current passing through the outer conductor 23 is opposite to the current passing through the center conductor 21. As a result, electromagnetic waves (magnetic fields) generated in both

conductors

21 and 23 cancel each other.

The outside of the outer conductor 23 is covered with the second coating 24.
The second coating 24 has insulating properties, and is in close contact with the outer peripheral surface of the outer conductor 23 by, for example, shrinking a heat-shrinkable tube with heat. An electromagnetic shield member 25 is provided outside the second coating 24.

The electromagnetic shield member 25 is a cylindrical braided member that is arranged coaxially with the central conductor 21 and is configured by braiding a plurality of metal strands. The electromagnetic shield member 25 is grounded by being electrically connected to the vehicle body, for example. Thereby, the electromagnetic shield member 25 can electromagnetically shield electromagnetic waves (magnetic field) generated by the central conductor 21 and the outer conductor 23 inside thereof.

Protective member 26 has a cylindrical shape and covers the outer periphery of electromagnetic shield member 25. The protective member 26 is configured by weaving reinforcing fibers excellent in insulation and shear resistance, and has flexibility. The protection member 26 is provided over substantially the entire length of each of the

conductors

21 and 23. Specifically, the protective member 26 is provided over the entire portion of the

conductors

21 and 23 other than a predetermined range at both ends exposing the

conductors

21 and 23 for connection.

Examples of reinforcing fibers include, for example, para-aramid fibers, polyarylate fibers, PBO (polyparaphenylene benzobisoxazole) fibers, PET (polyethylene terephthalate) fibers, ultrahigh molecular weight polyethylene fibers, PEI (polyetherimide) fibers, Examples thereof include glass fiber and ceramic fiber. And it is preferable to use one or more of these according to the physical properties required for the protective member 26. The protection member 26 of the present embodiment is composed of one type of para-aramid fiber. The outer side of the protection member 26 is covered with a third coating 27.

The third coating 27 has insulating properties, and is in close contact with the outer peripheral surface of the protection member 26 by, for example, shrinking the heat shrinkable tube with heat.
As shown in FIG. 4, the

conductors

21 and 23 of the coaxial cable 20 configured as described above are branched on one end side of the

conductors

21 and 23. More specifically, since the outer conductor 23 is a tubular braided member formed by braiding conductive wires, the central conductor 21 and the first coating 22 are exposed to the outside from the gaps between the strands. The outer conductor 23 and the center conductor 21 are branched at the branch portion X by being inserted through the outer conductor 23, that is, leading out of the outer conductor 23. At this time, not only the central conductor 21 but also the first covering 22 is branched at the branch portion X by being inserted so as to be exposed to the outside through the gaps between the strands. Insulation with the outer conductor 23 is maintained. The outer conductor 23 is arranged in such a manner that one end exposed from the second coating 24 has a substantially cylindrical shape, and the outer conductor 23 is exposed from the second coating 24 by a fourth coating 28 different from the second coating 24. Of the one end portion, a portion excluding the tip and the branched portion X is covered from the outside. The fourth coating 28 has insulating properties, and is in close contact with the outer peripheral surface of the outer conductor 23 by, for example, shrinking a heat-shrinkable tube with heat.

The branch portion X of the outer conductor 23 is covered with a fifth coating 29 provided so as to straddle the second coating 24 and the fourth coating 28. The fifth coating 29 has insulating properties, and is in close contact with the outer peripheral surface of the outer conductor 23 by, for example, shrinking the heat shrinkable tube with heat. As a result, the exposure of the outer conductor 23 at the branch portion X is suppressed.

As shown in FIG. 5, one end portion of the outer conductor 23 is provided with a hard pipe 30 between the outer conductor 23 and the fourth coating 28 to insert the outer conductor 23. The hard pipe 30 has a cylindrical shape with both ends opened, and is more rigid than the outer conductor 23 made of a plurality of strands. In this example, substantially half of the hard pipe 30 is covered with the fourth coating 28, and the remaining substantially half is exposed from the fourth coating 28. By adopting such a configuration, a predetermined outer shape can be maintained by the hard pipe 30, in other words, deformation of the outer conductor 23 can be suppressed. Therefore, for example, a waterproof structure using a rubber tube G or the like can be achieved between the connector part C1 and the connector part C1. In addition, illustration of the hard pipe 30 is abbreviate | omitted in FIG.

As shown in FIGS. 1 and 2, one end of each of the

conductors

21 and 23 is connected to the inverter 12 via a connector portion C1.
The other end portions of the

conductors

21 and 23 are branched in the same manner as the one end portions of the

conductors

21 and 23. That is, most of the

conductors

21 and 23 are arranged coaxially with each other, including the middle part thereof, but are separated from each other without being arranged coaxially with each other. Since the other end portions of the

conductors

21 and 23 have the same configuration as the one end portion of the

same conductors

21 and 23, detailed description thereof is omitted. The other end portions of the

conductors

21 and 23 are connected to the high voltage battery 11 via the connector portion C2.

Next, the operation of this embodiment will be described.
The coaxial cable 20 of the wire harness 10 of this embodiment has a structure in which a plurality of

conductors

21 and 23 and a plurality of

coatings

22 and 24 are laminated on the same axis. Further, the coaxial cable 20 includes a cylindrical protective member 26 provided on the outer side (outer peripheral side) than the

conductors

21 and 23. The

conductors

21 and 23 are collectively covered with a protective member 26 having excellent impact resistance (particularly shear resistance) knitted from reinforcing fibers made of para-aramid fibers. For this reason, even when there is an impact at the time of a vehicle collision, it is possible to prevent the

conductors

21 and 23 from directly contacting each other or from being short-circuited via other components. In addition, since the protective member 26 has insulating properties, the

conductors

21 and 23 are prevented from conducting through the protective member 26.

Next, the effect of this embodiment will be described.
(1) Impact resistance is improved by providing the cylindrical protective member 26 made of insulating reinforcing fiber on the outside of the central conductor 21, and as a result, between the central conductor 21 and the outer conductor 23. , That is, the short circuit between the

conductors

21 and 23 can be suppressed.

(2) Since the protective member 26 is provided outside the outer conductor 23, the outer conductor 23 is suppressed from being exposed to the outside, and the outer conductor 23 is prevented from being damaged.
(3) The center conductor 21 and the outer conductor 23 can be branched by inserting the center conductor 21 through the gap between the strands of the outer conductor 23 made of a braided member (that is, leading out through the gap).

(4) Since the outer conductor 23 made of a braided member has flexibility, it can be easily deformed when other members are fitted from the outside, and a waterproof structure can be realized by molding the connector portion, a rubber tube, or the like. difficult. On the other hand, in the present embodiment, the outer peripheral portion of the outer conductor 23 on the end side in the longitudinal direction is covered with the fourth coating 28 having insulation properties with the hard pipe 30 interposed. By providing the hard pipe 30 between the fourth coating 28 and the outer conductor 23 in this way, the predetermined outer shape can be maintained by the hard pipe 30, in other words, the deformation of the outer conductor 23 can be suppressed. Can do. Therefore, it is possible to achieve a waterproof structure by molding the connector portion C1, rubber tube G, or the like.

(5) The wire harness 10 is provided coaxially with the center conductor 21 and provided outside the center conductor 21 and the outer conductor 23, and has an electromagnetic shield member 25 made of a grounded tubular braided member. Thereby, it is possible to suppress leakage of electromagnetic waves generated by energizing the central conductor 21 and the outer conductor 23 to the outside. Here, for example, when the voltage applied to the center conductor 21 and the outer conductor 23 is relatively high, noise may be exerted on the low-voltage electric wire. By having 25, electromagnetic shielding is achieved and leakage of electromagnetic waves that cause noise to the outside can be suppressed.

(6) Since the outer conductor 23 acting as a negative pole conductor covers the central conductor 21 acting as a positive pole conductor, magnetic fields generated by energization cancel each other, and an electromagnetic shielding effect can be expected.

In addition, you may change the said embodiment as follows.
In the above embodiment, the protective member 26 is provided outside the center conductor 21, the outer conductor 23, and the electromagnetic shield member 25, but this is not a limitation.

For example, a configuration in which the protective member 26 is provided inside the electromagnetic shield member 25 and outside the center conductor 21 and the outer conductor 23 may be employed.
Further, a configuration in which the protective member 26 is provided inside the electromagnetic shield member 25 and the outer conductor 23 and outside the center conductor 21 may be adopted.

As described above, by providing the protective member 26 at least on the outer side of the central conductor 21, the same effect as in the above embodiment can be obtained.
In the above embodiment, the center conductor 21 and the one outer conductor 23 are provided. However, the present invention is not limited to this. It is good also as a structure which arrange | positions and covers a several outer conductor on the coaxial of the center conductor 21. FIG. As an example, for example, a high voltage circuit is formed by the center conductor 21 and the outer conductor 23 on the outer side thereof, and another outer conductor is provided on the outer side to form a low voltage circuit having a lower voltage than the high voltage circuit. Conceivable. In this case, by interposing the electromagnetic shield member 25 between the high-voltage circuit and the low-voltage circuit, the electromagnetic shield is achieved and the influence on the low-voltage circuit can be suppressed.

In the above embodiment, the coaxial cable 20 constituting the wire harness 10 connects the high voltage battery 11 and the inverter 12 and is used for a DC circuit, but is not limited thereto. For example, a coaxial cable may be used to electrically connect the inverter 12 and the wheel driving motor. That is, the coaxial cable 20 may be used as a part of the AC circuit. In such a configuration, for example, when the wheel driving motor is driven by three-phase AC, the coaxial cable further includes another outer conductor in addition to the center conductor 21 and the outer conductor 23. The other outer conductors are arranged outside the center conductor 21 and the outer conductor 23, and each conductor is insulated.

Moreover, you may employ | adopt the structure arrange | positioned mutually coaxially in the state in which both the conductors of the direct current circuit and the alternating current circuit were insulated in one coaxial electric wire.
In the above embodiment, the electromagnetic shield member 25 is provided, but the electromagnetic shield member 25 may be omitted.

-In above-mentioned embodiment, although the center conductor 21 was comprised with the cylindrical one conductor, you may change into a strand wire, a braided member, etc.
-You may combine the said embodiment and each modification suitably.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the technical concept thereof. For example, some of the parts described in the embodiment (or one or more aspects thereof) may be omitted, or some parts may be combined. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

DESCRIPTION OF SYMBOLS 10 ... Wire harness 20 ... Coaxial electric wire 21 ... Center conductor 23 ... Outer conductor 25 ... Electromagnetic shielding member 26 ... Protection member 29 ... Covering material 30 ... Hard pipe

Claims

A central conductor located in the center;
An outer conductor located outside the central conductor and coaxially with the central conductor and provided insulated from the central conductor;
A cylindrical protective member made of a reinforcing fiber that is at least outside the central conductor and coaxially with the central conductor, and has insulating properties;
A wire harness comprising:
The wire harness according to claim 1,
The wire harness according to claim 1, wherein the protective member is provided outside the outer conductor.
In the wire harness according to claim 1 or 2,
The outer conductor is a braided member formed by weaving conductive wires.
The wire harness, wherein the outer conductor and the center conductor are branched by inserting the center conductor through a gap between the strands constituting the outer conductor.
The wire harness according to any one of claims 1 to 3,
The outer conductor is a braided member formed by braiding conductive wires, and the outer conductor on the end side in the longitudinal direction of the outer conductor is covered with an insulating covering material with a hard pipe interposed. Wire harness characterized by being broken.
The wire harness according to any one of claims 1 to 4,
A wire harness comprising an electromagnetic shield member made of a tubular braided member, which is provided coaxially with the center conductor and provided outside the center conductor and the outer conductor.