DE102018003724A1 - Coaxial line, in particular for a motor vehicle - Google Patents

Abstract

The invention relates to a coaxial line (10) for conducting electric current, comprising an inner conductor (12) which has a first cross section (14) with a first surface area (A1) and with a plurality of outer cables (26) which extend in the circumferential direction (22 ) of the inner conductor (12) over its circumference are arranged distributed exactly single layer, each having an outer conductor (20) and a respective outer conductor (20) sheathing insulator (28) and via their respective own insulators (28) in the circumferential direction (22) directly abut each other, wherein the respective outer conductor (20) has a second cross section (24) with a relation to the first surface area (A1) smaller second area (A2), and the second area (A2) in total the first area (A1) correspond.

Description

The invention relates to a coaxial line, in particular a high-current coaxial line.

The object of the present invention is to provide a particularly advantageous coaxial line.

This object is achieved by a coaxial cable having the features of patent claim 1. Advantageous embodiments with expedient developments of the invention are specified in the remaining claims.

The coaxial line according to the invention for conducting electrical current is characterized by an inner conductor, which has a first cross section with a first surface area. Furthermore, the coaxial line according to the invention comprises a plurality of outer cables, which are arranged distributed in the circumferential direction of the inner conductor over the circumference exactly one layer. Furthermore, the outer cables each have at least or exactly one outer conductor and a separate insulator formed, for example, from a plastic, with which the respective outer conductor of the respective outer cable is encased. In addition, the outer cables are on their respective own insulators in the circumferential direction of the inner conductor or the coaxial cable total directly to each other, so that the insulators each touch directly in the circumferential direction. In this case, the respective outer conductor has a second cross section with a smaller surface area compared to the first surface area. In addition, it is provided that the second area contents in total correspond to the first area. In other words, if the sum of the second area contents is formed by adding all the second area contents of all outer conductors, the sum corresponds to the first area area. This means, in particular, that the sum is at most 5 Percent, especially at most 3 Percent of the first area of this deviates. The coaxial cable can be produced particularly cost-effectively, because individual cables designed as standard cables can be used for producing the coaxial cable and a mesh that is conventionally used can be dispensed with. This means that the outdoor cables can be designed as individual cable designed as a standard cable. In addition, the coaxial line can be contacted more easily than a conventional cable with a mesh.

The coaxial line according to the invention can be used particularly advantageously as a high-current axial line for an electrified motor vehicle and thus for a hybrid vehicle or for an electric vehicle, since particularly high electrical currents can be transmitted in a particularly advantageous manner by means of the coaxial line according to the invention. At the same time, the coaxial cable according to the invention can be produced in a particularly simple and cost-effective manner and can be installed particularly cost-effectively in the motor vehicle. In this case, the invention is based on the finding that electrical performances in electrified motor vehicles are increasing steadily. This steadily increasing electrical performance in electrified vehicles lead to a cable for transmitting electrical currents to ever-increasing interference and EMC problems. In order to be able to compensate interference fields, for example, the inner conductor is preferably designed as a forward conductor, which can be traversed in a first direction by electric current or through which it flows. By contrast, all outer conductors are designed as return conductors, which can be flowed through or flowed through by electrical current in a second direction opposite to the first direction. Furthermore, the coaxial line according to the invention has a discrete and thus particularly cost-effective design. The inner conductor is, for example, a central conductor, which is surrounded by the outer outer conductor and thus, for example, formed as a cable outer conductors. The respective outer conductor is thinner than the inner conductor, wherein the outer conductors are connected in parallel, for example. According to the invention, it is now provided that the sum of the second cross sections or the second area contents is equal to the first cross section or the first area.
Preferably, the inner conductor is encased with its own, for example, formed from a plastic insulator. The respective insulator is also referred to as insulation. Preferably, a respective, in particular in the radial direction of the inner conductor or the respective outer conductor extending thickness of the respective insulator is selected so that the outer conductor surround the inner conductor at least substantially completely. It is envisaged that insulators of the outer cable in the circumferential direction of the inner conductor directly and thus rest against each other and thus touch each other.

The coaxial cable according to the invention can be constructed from inexpensive standard cables, so that the coaxial cable according to the invention can be produced inexpensively. In addition, a particularly high bending flexibility and small bending radii can be realized because the outer conductor and the inner conductor can move against each other, which is particularly advantageous for thick high-current cables. In addition, standard methods of contacting the coaxial line with at least one other line may be used. In such a Standard methods are, for example, the crimping of cable lugs. Such standard methods can be used, in particular, for the outer conductors formed, for example, as outer shielding cables, since complicated contacting of a shielding braid in conventional coaxial cables can be avoided.

Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the figure description and / or alone in the single figure can be used not only in the respectively indicated combination but also in other combinations or alone, without the frame to leave the invention.

The drawing shows in the single FIGURE is a schematic cross-sectional view of a coaxial line according to the invention for conducting electrical current for a motor vehicle.

The single FIGURE shows a schematic cross-sectional view of a coaxial line 10 for conducting electrical power. The coaxial line 10 has exactly one inner conductor 12 on which a first cross-section 14 with a first surface area A1 having. The inner conductor 12 is a forward conductor and thus can be traversed by the electric current in a first direction. In other words, the electric current in the first direction through the inner conductor 12 stream. The inner conductor 12 is for example a vein or a soul of an inner cable 16 which is the inner conductor 12 and a first insulation also called insulator 18 may include. The inner conductor 12 is with the first insulation 18 encased and thus by means of insulation 18 electrically isolated. The first cross section 14 has a first radius c1 on. The inner cable 16 is also referred to as a central cable.

The coaxial line 10 also includes several outer conductors 20 , which in the circumferential direction of the inner conductor 12 are arranged distributed over its circumference exactly single layer. Thus, the outer conductors form only one layer or only one layer is provided, in which the outer conductor 20 are arranged. The circumferential direction of the inner conductor 12 is in the figure by an arrow 22 illustrated. As can be seen particularly clearly from the figure, the respective outer conductor has 20 a respective second cross section 24 with a respective second area A2 on. The respective second content A2 is smaller or smaller than the first surface area A1 , The area contents A2 are equal. Furthermore, the respective outer conductor 20 For example, part of a respective outer cable 26 , which the respective outer conductor 20 and a respective second insulation, also referred to as a second insulator 28 may include. Here is the respective outer conductor 20 with their own insulation 28 jacketed. As a result, the respective outer conductor 20 by means of the respective own isolation 28 electrically isolated. The respective insulation 18 respectively 20 is formed for example of a plastic. The inner conductor 12 and / or the respective outer conductor 20 may be formed of a metallic material, in particular copper or aluminum. Furthermore, the inner conductor 12 and / or the respective outer conductor 20 be designed as a strand or solid.

From the Fig. It can be seen that the respective outer conductor 20 a respective second radius c2 having. The inner cable 16 has a third radius d1 on, which in particular when the insulation 18 is provided, larger than the first radius c1 is. Is the insulation 18 not provided, for example, corresponds to the third radius d1 the first radius c1 ,

The respective outdoor cable 26 has a fourth radius d2 which is larger than the respective second radius c2 is. As can be seen from the figure, the third radius extends d1 of the inner cable 16 of which with the center of the inner conductor 12 coinciding center to an outer peripheral side surface of the optionally provided insulation 18 , Accordingly, the respective fourth radius extends d2 of the respective outer cable 26 of which with the center of the respective outer conductor 20 coinciding center to an outer peripheral side surface of the insulation 28 , The first radius c1 however, extends from the center of the inner conductor 12 to its outer peripheral side surface. Accordingly, the respective second radius extends c2 from the center of the respective outer conductor 20 up to its outer peripheral side surface. It is envisaged that the second area contents A2 in sum the first area A1 correspond. The outer conductors 20 have the same diameter the same diameter. In other words, the outer conductors 20 the same thickness.

$$\text{i}2=\text{d}2-\text{c}2$$

wobei i2 die in radialer Richtung des jeweiligen Außenkabels 26 verlaufende Dicke der jeweiligen Isolierung 28 bezeichnet. Dabei ergibt sich i2 zu: $$\text{i}2=\frac{d1}{\sqrt{\frac{\pi }{n-1}}}-\frac{c1}{\sqrt{n}}$$

Preferably, the outside cables 26 in the circumferential direction of the inner cable 16 arranged evenly distributed over its circumference, the outer cable 26 , especially about their insulation 28 , abut directly against each other in the circumferential direction and thus touch each other. This means that the outside cables 26 in the circumferential direction abut each other gapless and thus the inner cable 16 completely surrounded. For an integer, compared to 0 larger number n of example acting as a shielding cable outdoor cable 26 applies, if these lie without gaps in the circumferential direction of the central cable: $$\text{c}2=\text{c1 /}\sqrt{n}$$

$$\text{i}2=\text{d}2-\text{c}2$$

in which i2 in the radial direction of the respective outer cable 26 running thickness of the respective insulation 28 designated. This results i2 to: $$\text{i}2=\frac{d1}{\sqrt{\frac{\pi }{n-1}}}-\frac{c1}{\sqrt{n}}$$

At d1 = c1 the maximum possible number of shielding cables is n = 15, if d2 = 1.0043 * c2.

At d1 = 1.15 * c1 the maximum possible number n = 18 is at d2 = 1.0059 * c2 or for example n = 10 at d2 = 1.1981 * c2.

From the Fig. Is also particularly well recognizable that the inner cable 16 (Central cable) and the respective outdoor cable 26 respective individual cables, in particular standard cables, are from which the coaxial line 10 is constructed or assembled. Thus, the coaxial line 10 particularly simple and therefore inexpensive to build or manufacture.

LIST OF REFERENCE NUMBERS

10

coaxial

12

inner conductor

14

first cross-section

16

indoor cables

18

first insulation

20

outer conductor

22

double arrow

24

second cross section

26

outdoor cable

28

second insulation

A1

first area

A2

second area

c1

first radius

c2

second radius

d1

third radius

d2

fourth radius

Claims (3)

A coaxial line (10) for conducting electrical current, comprising an inner conductor (12) having a first cross-section (14) with a first area (A1) and a plurality of outer cables (26) extending in the circumferential direction (22) of the inner conductor (12). 12) are arranged distributed over the circumference exactly one layer, each having an outer conductor (20) and a respective outer conductor (20) sheathing insulator (28) and over their respective own insulators (28) in the circumferential direction (22) directly abut each other, wherein the respective outer conductor (20) has a second cross section (24) with a smaller second area (A2) than the first area (A1), and the second area contents (A2) in total correspond to the first area (A1). Coaxial line (10) to Claim 1 , characterized in that the inner conductor (12) with an insulator (18) is sheathed. Coaxial line (10) to Claim 1 or 2 , characterized in that the outer conductors (20) have the same diameter.

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