EP2954537B1 - Hybrid cable, method for producing same, and use of such a hybrid cable - Google Patents

Description

The invention relates to an electrical line, also referred to as hybrid cable, with the features of the preamble of claim 1. Furthermore, the invention relates to a method for producing such an electrical line and its use.

Such a line is for example in the US 2013/0277087 A1 described.

Cables and electrical lines are often exposed to mechanical stress. This results in safety-critical applications, such as applications in motor vehicles, relatively high demands on the durability and reliability of the line. In particular, axle cabling such as signal lines for wheel speed sensors or power lines for powering brakes are usually subject to repeated bending-compressive and compressive loads. In addition, further loads often result from changing environmental conditions, in particular such that a line is exposed to different temperature ranges. In addition to the requirements during operation, certain requirements also arise in particular during the assembly of the line in the motor vehicle. Frequently, the line is provided in the course of installation with connecting elements, in particular connectors or there is an additional packaging of the line.

In the US 2013/0277087 A1 For example, a complex wiring harness is described in which an ABS sensor cable and a brake cable are sheathed with a common outer sheath. By integrating two cables with different functions in a common wiring harness, in particular, the space required by this is reduced. The ABS sensor cable also includes two cores, which are covered by a common inner sheath. In a further development, the outer and inner sheath are each made of a thermoplastic urethane. In order to avoid sticking of the two coats when applying the outer sheath, the inner sheath material is additionally crosslinked in a further development, in another development, however, the cross-linking is dispensed with and the inner sheath is surrounded by a separating layer. In a variant, both cables of the cable harness are jointly surrounded by a circular shield, which can also be designed as a separating layer, wherein the gusset formed by the cables are filled with an additional filler.

The EP 1 589 541 A1 describes a flexible electrical power and control line comprising two signal wires surrounded by an inner shield and two supply wires, wherein the overall interconnection is surrounded by another, outer shield. In this way, in particular good electrical transmission properties are achieved. The shields are each made of a metallized plastic fleece, which in particular is so slightly stretchable that the inner shield is pressed by the supply wires in the gusset formed by the signal wires. The outer shield is substantially round, which makes it possible to arrange in the remaining gaps Beilauflitzen to further improve the shielding effect.

Another flexible, electric line shows the EP 2 019 394 A1 wherein the conduit here comprises a core having a compressible shell with a sliding layer applied thereon.

The DE 102 42 254 A1 describes an electrical cable for the connection of movable electrical consumers, in which several wires from one

Surrounding insulation having an inner and an outer layer, wherein the inner layer is softer than the outer layer. The wires are in turn surrounded by a common inner jacket. Between the wires and the inner jacket, a separating layer of powder is further arranged, whereby the inner shell also fills the gusset formed by the wires. In particular, the separating layer ensures relative mobility between the wires and the inner jacket. Similar to the insulations, the inner sheath consists of an inner cored layer and an outer layer, the inner layer being softer than the outer layer. The construction of the inner sheath allows in particular a cable assembly such that only the outer layer is severed and the inner layer is then torn off.

The invention is based on the object to provide a line which is suitable for safety-critical applications and in particular satisfies high demands on their durability or robustness or reliability. In particular, the line in addition to these operational requirements should be as easy to assemble, that is in particular be as easy to assemble and be as easy to handle during assembly. Furthermore, it is an object of the invention to provide a suitable method for producing the conduit and a use thereof.

The object is achieved by an electrical line according to claim 1, a use of the line according to claim 14 and the method according to claim 15 Advantageous embodiments, developments and variants are the subject of the dependent claims. In this case, the embodiments and advantages mentioned in connection with the line apply mutatis mutandis to the use and for the method and vice versa.

The electrical line comprises at least three wires, each with a conductor surrounded by a wire jacket, wherein two of the wires are formed as signal wires and another of the wires is designed as a power wire. The signal wires form a first sub-line, in particular a signal line and the power line forms a second sub-line, in particular a power line. In operation, the two sub-lines in particular each fulfill different functions, which is why the electrical line is also referred to as a hybrid cable.

The wires, in particular all the wires of the line are further surrounded by a separating sleeve, which in turn is surrounded by the common jacket of the electrical line. In other words, the two sub-lines are combined by the separating sheath and the common sheath applied thereto and thus form the electrical line.

The advantages achieved by the invention are, in particular, that the line has a particularly good flexural strength and a long service life, especially with repeated loading. The line and in particular the signal line itself is thus particularly robust, for example with regard to a bending, tensile, compression or compression load. The robustness of the signal line is particularly relevant in terms of their transmission characteristics. In this case, the signal cores are advantageously held immovably relative to one another or a relative movement of the signal cores to each other is at least greatly reduced, whereby in particular an error-free or at least reduced-error signal transmission is ensured. In particular, in the case of using the signal line in combination with a wheel speed sensor, a more accurate and robust transmission of a Raddrehzalsignals is ensured, which in turn a hereby carried out speed determination is improved.

The signal wires are surrounded by a common sub-line jacket, which in a preferred embodiment has an inner and an outer shell portion, wherein the outer shell portion is harder than the inner shell portion, that is made of a harder material than the inner shell portion. By this special selection of materials with respect to the different hardnesses of the shell sections of the sub-line jacket, the robustness of the signal line is improved. A particular further advantage of this choice of material also results in the overall composite of the line in that the outer, that is the harder shell section on the one hand, the inner signal wires in particular protects against the other elements of the line and on the other hand is also sufficiently hard to displace the out in the overall composite adjacent to the signal line power wires, in particular such that a selective pressure load of the signal wires is prevented by the power wires.

Under harder here and hereinafter understood in particular that the Shore hardness of the harder material is a higher value than that of the relatively softer material, the harder material is therefore a certain number of Shore hardnesses harder. The Shore hardness is suitably determined by a penetration test on the respective material by means of a spring-loaded pin. For example, the test is carried out according to the standards known for determining the degrees of hardness for elastomers and plastics, in particular by means of a so-called Shore D test, for determining the Shore D hardness. Preferably, then the outer shell portion is harder by at least two Shore D degrees of hardness than the inner shell portion.

The signal line itself is also particularly robust, in particular after assembly of the line, that is to say in particular after removal of the common jacket and exposure of the signal line over a specific length. Due to the harder outer shell portion of the exposed signal line is particularly protected, for example, with regard to shock and due to the softer inner shell portion at the same time particularly flexurally flexible.

In particular, the signal line serves to transmit an electrical signal, for example a sensor signal, while the power line serves to transmit an electrical power and to supply an electrical load. Therefore, the power wire typically has a larger conductor cross-section than the signal wires. Depending on how the consumer's ground connection is made, there may be a second line of power available; the power line then includes two wires. Especially in the automotive sector, however, it is known to use the body of a motor vehicle as a common mass; in this case only one power line is needed. in the Therefore, without restricting the general public, only one power supply is assumed below. In the case of a second power line then both power lines are in particular of a similar design.

Each of the wires comprises a conductor, which is preferably a stranded conductor made of a plurality of wires. Such stranded conductors are significantly more flexible in comparison to one-piece conductors with a similar cross-section and therefore contribute advantageously to the bending flexibility of the hybrid line. The conductor consists for example of copper, a copper alloy or aluminum and is surrounded by a wire jacket, which preferably consists of only one material, that is applied in a single layer. Such wires are particularly easy to manufacture and are provided in the manufacturing process of the hybrid cable, for example, as pre-assembled wires.

The signal wires are surrounded in particular for their protection by a sub-line jacket and form in this way the first sub-line. In the radial direction, the subcircuit jacket is divided into two jacket sections, namely an inner and an outer jacket section. These are made of different materials such that the inner shell portion is softer than the outer. In this case, the inner jacket section preferably extends approximately up to half of the total radius of the first partial line and the outer jacket section correspondingly over the remaining total radius. In particular, when bending the signal line thereby an improved balance between compression and compression zones is possible. In the context of the entire hybrid cable, the signal wires are also advantageously protected against mechanical stresses from the outside, for example against a pressure load by the usually solid power wires.

For the preparation, the two shell sections are suitably applied in a two-layer process, for example extruded. For this purpose, the inner shell portion is first applied to the two signal wires and fills in particular the gusset between the signal wires. The inner shell portion is also preferably applied with a circular outer contour. Subsequently, on the inner shell portion of the outer shell portion applied, which preferably also has a circular outer contour and is then formed a total of annular.

By the sub-line jacket and in particular by a suitable choice of the total radius in the production of the first sub-line and the distance of the signal line to the power line in the hybrid cable can be adjusted advantageously with respect to the electrical properties. In operation, a possible crosstalk between signal and power wires is then prevented or at least reduced due to the appropriately selected distance; the sub-line jacket then acts in particular as a spacer. This feature is particularly useful in those applications where the signal line and the power line may be operating simultaneously.

In a suitable alternative or in addition, it is possible to provide the entire line, one or both sub-lines or the respective wires with separate shields and in this way to improve the electrical transmission properties. If in operation, however, no simultaneous transmission by means of the signal and power line, it is preferred to dispense with such additional shields, whereby the hybrid cable is then overall easier and cheaper to manufacture.

In the overall composite of the electrical line, the specially constructed sub-line jacket thus fulfills, in particular, a plurality of functions: for the first, protection of the signal wires takes place both in the overall network and in the case of a separate routing of the signal line; Secondly, a particularly high bending flexibility of the signal wires is ensured; and third, it is possible to adjust the electrical properties of the overall composite advantageous.

The two sub-lines are summarized by the common jacket, which is also referred to as outer jacket. This has in particular a circular outer contour, which is also the outer contour of the entire hybrid cable at the same time. In other words, the outer surface of the common shell also forms the outer surface of the electrical conduit. The outer jacket is preferably extruded and single-layered, that is made of only one material. In order to improve the flexural flexibility of the hybrid cable, the outer sheath is expediently softer than the outer sheath portion of the partial sheath. As a result, in particular a displacement of the softer outer shell material is made possible by the harder material of the outer shell section. In a suitable embodiment, the entire jacket is softer than the outer shell section by at least ten Shore D degrees of hardness.

The sub-line jacket of the first sub-line and / or the common jacket of the electrical line is or are preferably formed of a thermoplastic polyurethane elastomer, also referred to as TPE-U. On the one hand, this material is particularly robust and, on the other hand, easy to process and is frequently also used to produce housings for functional elements, such as plugs. The formation of a respective shell of this material then advantageously allows a particularly durable molding of a housing to the hybrid cable or the signal line, that is, allows a particularly simple encapsulation of the respective jacket. In particular, the material is not cross-linked and therefore particularly suitable for being melted or overmoulded and encapsulated in a subsequent process step.

The connection between the housing and the jacket is also particularly dense, since the housing with the jacket during molding in particular cohesively and / or accurately connected. In operation, this advantageously avoids the penetration of dirt and moisture into the hybrid cable and / or the signal line. In a particularly suitable embodiment of the electrical line, therefore, a functional element is connected to the first part line, with a housing which is made of a material which is chemically and / or physically connectable to the material of the outer cover section. The housing here is, for example, a molded part, a connector housing or a spout.

By chemically connectable is meant in particular a cohesive connection of the two materials. Particularly preferred here is a Embodiment in which the housing and the corresponding sheath are made of the same material. By physically connectable on the other hand is understood in particular a precisely fitting mounting of the housing, wherein the housing is held on the respective shell, in particular by static friction. For example, the housing is provided as a finished part, expanded by compressed air and placed on the line or one of the sub-lines. After switching off the compressed air, the housing is positively around the corresponding line around and is held by the additional static friction of the two physically connectable materials to each other particularly firm. Particularly in the case of the signal line, the particularly circular design of the subcircuit jacket due to the applied two-layer method contributes to the physical connection, since in this way a particularly accurate fit between housing and jacket is achieved. In particular, the first sub-line is therefore suitable for tightly and firmly attaching a housing for a molding element. However, the concepts described here are not limited to the first sub-line, but is advantageously also correspondingly a chemical and / or physical connection of a housing in particular with the entire jacket of the hybrid cable or a jacket of the second sub-line possible.
In the case of thermoplastic polyurethane elastomer, moreover, the degree of hardness can be adjusted in a simple manner by selecting the material composition and is therefore particularly suitable for forming the subcable jacket with differently hard jacket sections. The sub-line jacket then consists of a total of several, in particular only two materials, although different hardness, but both are thermoplastic polyurethane elastomers and in the manufacture of the sub-line jacket in particular firmly, that is cohesively connect together. In this way, a sub-line jacket is provided, which although in the radial direction has a varying hardness, but in the assembly of the first sub-line, that is removable in particular in the stripping in one piece. The material selection described thus offers both advantages in the operation of the hybrid cable as well as its handling during assembly, in particular during assembly.

In an advantageous embodiment, the core jacket of the wire designed as a power core is softer than the outer shell portion. Similar to the softer common jacket described above, this results in the advantage that the core jacket of the power line evades with a mechanical load on the signal line, which in turn protects the signal wires. Conveniently, in addition, the signal wires are also each surrounded in a similar manner with a wire jacket, which is softer than the outer shell portion, in particular for all wire coats, the same material is used.

At least one vein jacket, expediently all vein coats are preferably made of polyethylene, in particular of a cross-linked polyethylene. The latter is also referred to as XLPE. This material is easy to process, has an advantageous sliding action and is also available in particular in a hardness, which is preferably between the respective hardness of the inner and the outer shell portion. Thus, the core coats of the signal wires are relatively hard with respect to the surrounding inner shell portion and the core jacket of the power wire is relatively soft against the voltage applied to this outer shell portion. This makes it possible in particular to use the same material for all vein coats and at the same time to ensure a correspondingly improved bending flexibility.

In order in particular to permit residue-free stripping of at least one of the wires, preferably all the wires, the respective wire is designed such that a wire-separating layer formed as a heat-sealing layer is arranged between its conductor and its wire jacket. The particular heat-sealing layer applied in particular delimits the conductor jacket against the conductor and advantageously has improved sliding properties relative to the conductor material, so that stripping is possible in a particularly simple manner and with reduced expenditure of force. In the production of the wire, the heat-sealing layer is first applied in particular as a film on the conductor. Subsequently, the jacket is extruded, wherein the heat-sealing layer connects to the jacket material such that it is advantageously removed without residue during stripping.

The sub-lines form a sub-line bundle which is surrounded by the separating sleeve, wherein in a preferred embodiment this is adapted to the outer contour of the sub-line bundle. In this case, it is understood in particular that the release film in the cross section of the hybrid cable follows the contour formed by the sub-line bundle and rests correspondingly in the interstices of the sub-line bundle. In this case, it is advantageous to dispense with an additional filler material, whereby a corresponding additional process step is avoided, in particular during production.

In a suitable embodiment, the separating sleeve is a plastic fleece or a plastic foil, that is to say in particular generally a separating foil which is manufactured from a plastic. In contrast to a powder coating, a release film can be removed without residue during stripping in a particularly simple manner, thus simplifying the assembly of the cable. A residue-free removal is also particularly important in a subsequent Anformung of functional elements of importance. In the case of a powder separating layer, before the encapsulation of the respective conduit, it would first have to be cleaned of remaining powder. In a preferred embodiment, the sub-lines are therefore carried out without a release agent, that is not provided on the outer sides with a release agent, especially not with a powdery or pasty release agent. This eliminates the need for additional cleaning. Rather, when using a release film, this particular removable together with the common coat and advantageously removable without residue. In general, any continuous film or layer material is suitable as a release liner, for example a nonwoven material, a paper material, a textile material or a combination thereof. However, particularly preferred is a plastic material, which in particular is metallised, since this at the same time in particular has a suitable tear-off behavior as well as a good stability and bending flexibility.

In a suitable development, the separating sleeve, in particular separating foil, is applied in a longitudinally running manner onto the two partial lines. Such a longitudinally-shrinking release film has a particularly favorable tear-off behavior, whereby in turn, a packaging of the hybrid cable is simplified. Since a long-running application has a significantly higher process speed than, for example, a banding, such a hybrid cable is particularly fast to produce, that is also in a correspondingly higher number of pieces per time.

To apply the separating sleeve, it is preferably laid around the partial line bundle as a band with a specific longitudinal seam overlap and in a suitable width. Preferably, the longitudinal inlet is spiraled. In this case, the separating sleeve is applied to each other in particular during the twisting of the sub-lines and also entrecht applied with a rotation such that the longitudinal seam follows the twisted course of the partial lines in a spiral. This means, in particular, that the longitudinal seam extends longitudinally along the sub-lines, in contrast to a banding, which is usually carried out separately and thus process-consuming. In a suitable alternative, the separating sleeve is applied only after the sub-lines have been combined, before or while the common jacket of the hybrid cable is being applied. In this case, the longitudinal seam extends straight in the longitudinal direction of the hybrid cable. Subsequently, the common jacket is applied, preferably extruded. The insertion of the release film in the gusset is then preferably by the contact pressure during application of the common jacket. The Längsnahtüberlapp is then chosen in particular such that the remaining after application of the common jacket Längsnahtüberlapp is minimized.

The conductors of the signal wires, ie in particular their wires are preferably made of a copper alloy, which has an improved sliding behavior compared to pure copper and thus contributes to the bending flexibility of the signal line. However, since significantly more conductor material is required for the production of the power wire due to the larger compared to the signal wires cross section, the conductor is preferably made of copper and thus at least cheaper than a copper alloy. In order nevertheless to achieve a likewise improved sliding behavior for the power wires, their wires are expediently stranded together by a special method to a thigh strand: this the wires of the wire are first grouped into several bundles and each of the bundles is twisted in a thigh stroke direction into a leg. These legs are in turn twisted to a thigh strand. In this case, one of the legs is a central limb, whose thigh stroke direction is opposite to the thigh stroke direction of the other leg surrounding it and around which these other limbs are stranded in the opposite direction to the thigh stroke direction.

For example, the conductor comprises seven legs in a 1 + 6 stranding. Here, the wires of the inner leg, that is the central leg, are twisted in the opposite direction to the wires of the respective outer bundles. In the area of contact between the outer legs and the central leg, the wires then advantageously extend crosswise, thereby avoiding slippage when bending the wire. The stranding of the outer legs takes place in response to the thigh impact direction of these bundles, whereby the bending flexibility of the wire is improved, in particular because the individual wires are straighter compared to a straight-cut version. Overall, a vein formed as a thigh strand according to the above method thus shows an improved mechanical behavior and improved positional compensation of the wires under combined load.

By combining this special stranding with copper as the conductor material, it is then possible, in particular in the case of the power core, to produce a core with particularly good sliding and bending behavior from copper which is inexpensive compared to a copper alloy. In addition, the special stranding is also suitable in principle for the signal wires, which, however, as described above, are preferably manufactured from a copper alloy as a result of weighing the production outlay against the material costs, and then in particular stranded in a conventional manner. In this case, the signal wires preferably each have a conductor configured as a stranded conductor, wherein the conductors are formed with a common strand striking direction. The signal wires are then preferably twisted in the same direction with respect to this Litzenschlagrichtung, resulting in particularly advantageous electrical transmission properties.

To further improve the mechanical properties of the respective wire twisting the wires of this wire is suitably carried out with a lay length of at least 60 mm and at most 150 mm, preferably about 100 mm. The diameter of a wire is approximately between 0.05 mm and 0.11 mm. The diameter of a respective sub-line is then in particular approximately between 3 mm and 11 mm.

In particular, to achieve a stress-free stranding of the wires of a respective leg, the legs are stranded to each other with reverse rotation. The corresponding unwinding coils are not held in the stranding, but rotated counter to the direction of rotation of the stranding basket, whereby the individual legs and in particular their wires in the composite advantageously present with reduced torsion.

In the overall composite of the electrical line, according to a preferred embodiment, the cores of the first sub-line are twisted together and subsequently twisted with the power line of the second sub-line. In particular, in the case of multiple power cores, they are first twisted together and finally the first subline is twisted with the second subline.

After applying the common jacket, which is in particular the outermost jacket of the line, the line preferably has an outer diameter of 7 mm to 11 mm. As a result, the line is particularly suitable for use in the automotive sector. The first sub-line is expediently used as a signal line and is connected to a wheel speed sensor in the motor vehicle and the second sub-line serves as a power line and is connected to an electric brake actuator, in particular a parking brake of the motor vehicle.

The twisting and triple stranding described above advantageously ensures an interference immunity such that at the same time by means of the signal line a signal and by means of the power line an electrical power for the supply of a Actuator is transferable. This makes it possible to use the electric parking brake as an emergency brake. In other words, the power line is not only used in a resting state, for example, when standing or parking the motor vehicle for power transmission, but advantageously also, if necessary, in a driving dynamic state.

Instead of a packaging and molding of functional elements only when mounting the electrical line, it is also possible to make them already complete with attached functional elements. In a particularly suitable embodiment, a functional element is then connected to one end of the first part of the line, in particular a speed sensor, with a housing, which is materially connected to the outer shell portion. In a suitable development, in addition, the other end of the first part line and / or the ends of the second part line are each provided with a plug.

Fig. 1

eine elektrische Leitung im Querschnitt,

Fig. 2

ausschnittsweise die Leitung gemäß Fig. 1 in einer Seitenansicht, und

Fig. 3

eine als Schenkellitze ausgebildete Ader der Leitung gemäß Fig. 1.

An embodiment of the invention will be explained in more detail with reference to a drawing. In each case schematically show:

Fig. 1

an electrical line in cross section,

Fig. 2

Sectionally the line according to Fig. 1 in a side view, and

Fig. 3

a vein of the line designed as a thigh strand according to Fig. 1 ,

In the Fig. 1 is an electrical line 2 is shown in cross-section, which is designed as a hybrid line and to two sub-lines 4, 6 comprises. Here, the first sub-line 4 is here a signal line having two signal wires 8, which are surrounded by a common sub-line jacket 10. By contrast, the second sub-line 6 is designed here as a power line and for this purpose comprises two power cores 12 with a larger cross-section than the signal cores 8 and without a common sub-line jacket. The wires 8, 12 each include a conductor 8a, 12a and a respective surrounding wire core 8b, 12b. In order in particular to facilitate a separation of the respective core jacket 8b, 12b, is between this and the associated conductor 8a, 12a, a core separating layer 13 is arranged, which is designed here as a heat-sealing layer and is connected to the respective core jacket 8b, 12b cohesively.

The sub-line jacket 10 of the first sub-line 4 is here formed in two layers, wherein initially an inner jacket portion 10a surrounds the two signal wires 8 and thereby fills the gusset formed between the signal wires 8. This inner shell portion 10a also has a circular outer contour. In the radial direction adjoins the inner shell portion 10a an outer shell portion 10b, which is here in particular annular. Here, the outer shell portion 10b made of a harder material than the inner shell portion 10a and materially connected thereto.

In the embodiment shown here, both shell sections 10a, 10b are made of a thermoplastic polyurethane elastomer, wherein the material composition is varied such that the outer shell section 10b is harder. The transition from the inner to the outer shell portion 10a and 10b is in Fig. 1 indicated by a dashed line. It is clear that the outer shell portion 10b extends approximately over half the total radius R of the signal line 4 and at the same time also serves as a spacer between the signal wires 8 and the power cores 12.

The two sub-lines 4, 6 are surrounded by a common separating sleeve 14, which in the Fig. 1 and 2 is shown as a reinforced line. This separating sleeve 14 is a separating film made of a plastic, which is guided around the partial lines 4, 6 in a longitudinally running manner and in this case rests in the gussets formed by the two partial lines 4, 6. On additional filling elements between the sub-lines 4, 6 and the separating sleeve 14 was omitted. Both partial lines 4, 6 are finally combined by a common jacket 16, which is applied to the common separating sleeve 14. In this case, the separating sleeve 14 makes it possible, in particular, for the common jacket 16 and the subcircuit jacket 10 to be made of the same material and nevertheless to be easily separable from one another during assembly. The common jacket 16 continues to have a circular outer contour, with a diameter of about 10 mm here, which also corresponds to the outer diameter D of the electrical line 2. The common jacket 16 is thus also an outermost jacket of the line. 2

In the Fig. 2 is a section of the line 2 according to Fig.1 shown in a page presentation. Clearly visible are the two signal wires 8 with the surrounding sub-line jacket 10 and the two power cores 12. In addition, a dashed line indicates a housing 18 of a functional element, for example, a speed sensor. The power cores 12, however, for example, provided with a suitable connector and connected to a brake actuator not shown here. The housing 18 is here made of the same material as the signal line 4, in the variant shown in particular of a thermoplastic polyurethane polymer, and also integrally formed integrally on the sub-line jacket 10, whereby the connection is particularly dense and robust. The common jacket 16 has been stripped so far that the two sub-lines 4, 6 protrude partially and can be laid and connected as separate lines to different locations. In particular, the harder shell portion 10b ensures particularly good stability of the separately routed signal line 4.

It is clearly recognizable in Fig. 2 also the separating sleeve 14 shown, which was separated without residue during stripping of the common jacket 16. Since consequently no residues remain on the sub-line jacket 10, the formation of the housing 18 on the sub-line 4 is particularly simplified.

The conductors 8a of the signal wires 8 are each made in the embodiment shown here from a plurality of wires, each consisting of a copper alloy. In contrast, the conductors 12a of the power line 6 are made of copper and formed by means of a special Verseilprozesses as thigh strands.

To clarify the construction of the conductors 12a of the power cores 12, an embodiment of one of the conductors 12a in FIG Fig. 3 shown. This is as a thigh strand shown with seven legs 20, 22 in an exemplary 1 + 6 stranding. The centrally arranged leg 20 represents a central leg, around which the remaining legs 22 are stranded.

Each of the legs 20, 22 includes a plurality of wires 24 that are twisted together in a respective leg striking direction S1, S2. The thigh striking direction S1 of the central leg 20 corresponds to the opposite direction of the thigh striking direction S2 of the outer leg 22. The stranding of these outer legs 22 about the central leg 20 also takes place in the opposite direction to the thigh striking direction S2 and thus in the direction of thigh striking direction S1 of the central leg 20th This results in the intermediate region Z, in which a respective leg 22 rests against the central leg 20, a crossing course of the respective wires 24. Furthermore, results from the backlash of the outer leg 22 with respect to their respective thigh strike direction S2 a largely straight course of the corresponding wires 24. The trained in this way power wire 12 then has a particularly high bending flexibility.

LIST OF REFERENCE NUMBERS

2

electric cable, hybrid cable

4

first sub-line (signal line)

6

second sub-line (power line)

8th

Vein (signal wire)

8a

ladder

8b

core sheath

10

Part cable sheath

10a

inner jacket section

10b

outer shell section

12

Vein (power line)

12a

ladder

12b

core sheath

13

Core Interface

14

separator envelope

16

common coat

18

Housing (of a functional element)

20

central leg

22

leg

24

wire

D

outer diameter

R

Total radius of the first sub-line

S1, S2

Leg impact direction

Z

intermediate area

Claims (15)

1. Electrical line (2), comprising at least three cores (8, 12) each halving a conductor (8a, 12a) surrounded by a core coating (8b, 12b), wherein

   - two of the cores (8) are formed as signal cores and form a first partial line (4), in particular signal line, with a mutual partial line coating (10) surrounding these,

   - a further one of the cores (12) is formed as a power core and forms a second partial line (6), in particular power line, characterised in that

   - the two partial lines (4, 6) are surrounded by a mutual separating shell (14) which is in turn surrounded by a mutual coating (16) of the electrical line (2).
2. Line according to the preceding claim,
   characterised in that
   the partial line coating (10) has an inner coating section (10a) as well as an outer coating section (10b) and the outer coating section (10b) is harder than the inner coating section (10a).
3. Line (2) according to one of the preceding claims,
   characterised in that
   the mutual coating (16) is softer than the outer coating section (10b).
4. Line (2) according to one of the preceding claims,
   characterised in that
   a functional element is connected to the first partial line (4), having a housing (16) which is produced from a material which is able to be connected chemically and/or
   physically to the material of the outer coating section (10b).
5. Line (2) according to one of the preceding claims,
   characterised in that
   the core coating (12b) of the core (12) formed as a power core is softer than the outer coating section (10b).
6. Line (2) according to one of the preceding claims,
   characterised in that
   at least one core coating (8b, 12) is formed from polyethylene, in particular from a cross-linked polyethylene.
7. Line (2) according to one of the preceding claims,
   characterised in that
   at least one of the cores (8, 12) is formed in such a way that a core separating layer (13) formed as a heat seal layer is arranged between the conductor (8a, 12a) thereof and the core coating (8b, 12b) thereof.
8. Line (2) according to one of the preceding claims,
   characterised in that
   the partial lines (4, 6) form a partial line bundle which is surrounded by the separating shell (14), wherein this is adapted to the outer contour of the partial line bundle.
9. Line (2) according to one of the preceding claims,
   characterised in that
   the separating shell (14) is a plastic fleece or a plastic film.
10. Line (2) according to one of the preceding claims,
    characterised in that
    the two partial lines (4, 6) are designed to be free of separating means.
11. Line (2) according to one of the preceding claims,
    characterised in that
    the separating shell (14) is applied to the two partial lines (4, 6) to shrink longitudinally, in particular in a spiral.
12. Line (2) according to one of the preceding claims,
    characterised in that
    the cores (12) of the second partial line (6) each comprise several wires (24), the wires (24) of a respective core (12) are firstly combined into several bundles, each bundle is twisted in a limb lay direction (S1, S2) into a limb (20, 22) and the limbs (20, 22) are twisted into a limb braid, wherein one of the limbs (20, 22) is a centrally guided limb (20), the limb lay direction (S1) of which is opposed to the limb lay direction (S2) of the remaining limbs (22) surrounding this, and around which these remaining limbs (22) are twisted in the opposite direction to the limb lay direction (S2) thereof.
13. Line (2) according the preceding claim,
    characterised in that
    the limbs (20, 22) are twisted with respect to each other using reverse twisting.
14. Use of a line (2) according to one of the preceding claims,
    characterised in that the first partial line (4) is connected to a wheel speed sensor in a motor vehicle as a signal line, and the second partial line (6) is connected to an electrical brake actuator, in particular an electrical parking brake of the motor vehicle, as a power line.
15. Method for the production of an electrical line (2), in particular a line (2) according to one of claims 1 to 13, wherein, for the formation of the line (2)

    - two cores (8) are combined, in particular twisted, into a first partial line (4),

    - a partial line coating (10) is applied mutually to the two cores (8) by an inner coating section (10a) firstly being applied and an outer coating section (10b) then being applied which is harder than the inner coating section (10a),

    - at least one further core (12) forms a second partial line (6),

    - the two partial lines (4, 6) are combined, in particular twisted, and are surrounded with a mutual separating shell (14), and

    - a mutual coating (16) is then applied to the separating shell (14).

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