DE102019203527A1 - Device for inductive energy transmission for a truck - Google Patents

Abstract

The invention relates to a device (12) for inductive energy transmission between a traction battery (10) and an electric motor (8) of a truck (2) with a truck (4) and with a trailer (6), the truck (4) the traction battery (10) or the electric motor (8). The device has a trailer coupling (18) with a coupling pin (22) and a first transformer winding (24), and a trailer drawbar (14) with a towing eye (20) for the coupling pin (22) and one in the trailer drawbar (14) ) integrated second transformer winding (26), wherein the towing eye (20) is wrapped by the second transformer winding (26), and wherein the coupling bolt (22) forms a first ferromagnetic core for the second transformer winding (26) when it is in the towing eye (20) is included. The invention also relates to such a truck (2), a truck (4) and a trailer (6).

Description

The invention relates to a device for inductive energy transmission between a traction battery and an electric motor of a truck with a truck and with a trailer, the truck having the traction battery or the electric motor.

A truck trailer is a combination of a truck and a trailer for the truck. For the mechanical coupling of the truck to the trailer, a trailer coupling with a coupling pin is typically attached to the truck, which is received in a receptacle, called a towing eye, of a trailer drawbar of the trailer.

A truck-trailer combination driven by an electric motor has a traction battery which provides the electrical energy required to drive the truck-trailer combination for an electric motor. Here, for example, the trailer can have the traction battery and the truck the electric motor or vice versa. It is therefore necessary to transfer the electrical energy required to operate the electric motor, and thus to drive the truck, from the trailer to the truck.

For the electrical energy to be transmitted to drive the truck by means of a power cable, it would have to have a comparatively large cross section and, as a result, a comparatively large dead weight. Furthermore, a corresponding tensile load would act on such a power cable in the event of a relative movement of the trailer and the truck, for example in the course of a steering movement. Because of this, the disadvantage of such a power cable would be a risk of a cable break and the associated risk of a short circuit and / or a fire being comparatively high.

For example, from the US 6,222,443 B1 a system for inductive transmission of energy and data between a passenger car and a trailer is known. For this purpose, a first coil is integrated in a ball head of a trailer coupling of the passenger vehicle, which is designed as a ball head coupling, and a second coil is integrated in a ball socket arranged on the drawbar of the trailer. By means of the coils, electrical energy and signals for lighting or for electrical braking systems are inductively transmitted from the passenger car to the trailer.

The invention is based on the object of specifying a suitable device for a truck, by means of which energy can be transmitted inductively from a traction battery to an electric motor of the truck. In particular, the greatest possible power should be able to be transmitted inductively. Furthermore, such a truck with such a device, as well as a trailer and a truck of such a truck are to be specified.

With regard to the device, the object is achieved according to the invention by the features of claim 1. With regard to the trailer, the object is achieved with the features of claim 8, with regard to the truck with the features of claim 9 and with regard to the truck with the features of claim 10. Advantageous refinements and developments are the subject of the dependent claims. The statements made in connection with the device also apply accordingly to the truck, truck and trailer, and vice versa.

For this purpose, the device for inductive energy transfer between a traction battery and an electric motor of a truck is provided and set up. In particular, the electric motor is provided to drive the truck. Furthermore, the truck has a truck and a trailer, either the truck having the traction battery and the trailer having the electric motor, or alternatively the truck having the electric motor and the trailer having the traction battery. The traction battery is also referred to below as the battery for short. If the trailer has the electric motor, the trailer is used in addition to a further drive train of the truck to accelerate the truck.

The device has a trailer coupling, in particular designed as a jaw coupling, for the truck. The trailer coupling comprises a coupling bolt and a first transformer winding. Furthermore, the device has a trailer drawbar for a (truck) trailer with a drawbar eye for the coupling bolt and with a second transformer winding. This is integrated into the trailer drawbar. In particular, the second transformer winding is arranged in the trailer drawbar. In addition, the towing eye is wrapped around by the second transformer winding, in other words, the second transformer winding includes the towing eye.

When the coupling bolt is received in the drawbar eye, i.e. in a closed position or in a closed state, the coupling bolt forms a (first) ferromagnetic core (magnetic core, iron core) for the second transformer winding. In this way, in the closed state, the second transformer winding includes the coupling bolt, also referred to for short as a bolt. In other words, the second transformer winding is around the Coupling bolt wound. Furthermore, the coupling bolt is expediently made of iron.

In particular, the second transformer winding has a winding axis (coil axis) which corresponds to a longitudinal axis of the coupling bolt. Thus, the second transformer winding is arranged concentrically to the coupling bolt forming the first ferromagnetic core. The first transformer winding is also referred to here and below for short as the first winding and the second transformer winding is also referred to as the second winding.

An inductive coupling is implemented by means of the two transformer windings, so that when the traction battery is connected to the device and the electric motor is connected to the device, energy can and expediently be transmitted inductively between them. Advantageously, no power cable is necessary for this, which electrically connects the trailer to the truck.

In summary, the coupling bolt fulfills a double function. On the one hand, the coupling bolt is used for mechanical coupling with the drawbar. On the other hand, it serves as a ferromagnetic core for the second transformer winding and thus for inductive energy transmission.

According to a first variant of the device, the first transformer winding is wound around the coupling bolt. In the closed state, the coupling bolt thus forms a (first) ferromagnetic core that is common to both transformer windings. A transformer with a rod-shaped core is thus formed by means of the two transformer windings and by means of the coupling bolt.

Due to the formation of a common transformer core by means of the coupling bolt, a comparatively high degree of efficiency can advantageously be achieved in the inductive energy transmission. Accordingly, a comparatively large electrical power can be transmitted inductively. Furthermore, this variant of the device is advantageously constructed in a comparatively simple and space-saving manner. For the inductive coupling, only the two transformer windings in the drawbar or around the coupling bolt are necessary.

According to a second variant of the device, the trailer coupling has a U-shaped (second) ferromagnetic core. The second core thus has two U-legs which are spaced apart from one another and run parallel to one another and a U-connecting leg connecting them. The first transformer winding is wound around the second core, preferably around the U-connecting leg.

In addition, the free end of the U-connecting legs, that is to say with their end facing away from the U-connecting leg, face the coupling bolt, in particular an axis defined by means of the coupling bolt. In particular, the two U-legs and the U-connecting leg span a plane which comprises the axis defined by means of the coupling bolt. As a result, a common transformer core for the two transformer windings is formed in the closed position by means of the U-shaped second core and by means of the coupling bolt. In particular, a closed magnetic circuit is implemented in this way.

The second core is arranged, for example, within a receiving space for the towing eye formed by a coupling mouth (pulling mouth) of the trailer coupling. Alternatively, the second core comprises the coupling mouth and is therefore arranged outside the receiving space formed by the coupling mouth.

Due to the formation of a common transformer core by means of the first core, that is to say the coupling bolt, and the second core, a comparatively high degree of efficiency can advantageously be achieved in inductive energy transmission. Accordingly, a comparatively large electrical power can be transmitted inductively.

According to an advantageous embodiment of the second variant, the second core is curved on its U-legs on the free-end side, i.e. at its ends facing the coupling bolt, in particular arcuate, preferably semicircular, inward, i.e. towards the U-connecting leg. Due to the rounding, a contact area between the first core and the second core is increased. In particular, in this way the formation of an (air) gap between the first core, that is to say the coupling bolt, and the second core is avoided or the extent of this gap is at least reduced. As a result, the formation of a magnetic stray field during operation of the device is avoided or at least greatly reduced and the efficiency of the device with regard to inductive energy transmission is thus advantageously improved.

According to a suitable development of the first and the second variant of the device, the device comprises a voltage converter. This is connected to the second transformer winding if the traction battery is intended for the trailer. Alternatively, provided the traction battery for the truck is provided, the voltage converter is connected to the first transformer winding. The voltage converter serves the purpose of converting the direct voltage provided by the traction battery or the direct current provided by the traction battery into the alternating voltage required for inductive transmission or the alternating current required for inductive transmission and / or the one with the traction -Battery connected transformer winding induced alternating voltage or the alternating current induced there into a, in particular for charging the traction battery suitable, to convert direct voltage or a corresponding direct current.

In addition, the device according to this development comprises a converter which is connected to the second transformer winding, provided that the electric motor is provided for the trailer. Alternatively, if the electric motor is intended for the truck, the converter is connected to the first transformer winding. The converter serves the purpose of converting the alternating voltage or alternating current provided by the electric motor in the course of recuperation, in particular when braking the truck, into an alternating voltage or alternating current, the frequency of which for inductive transmission by means of the Transformer windings is suitable. This frequency is preferably constant and / or selected such that an efficiency of the inductive energy transmission is as high as possible in accordance with the configuration of the first transformer winding, the second transformer winding, the first core and the second core. Furthermore, the converter serves the purpose of converting the alternating voltage induced in the transformer winding connected to the electric motor or the alternating current induced there into an alternating voltage or a corresponding alternating current, particularly suitable for operating the electric motor.

In summary, the device has a battery-side voltage converter and a motor-side converter.

According to a suitable development of the device, it has two modulation / demodulation devices. One of these modulation / demodulation devices is connected to the first transformer winding and the other of the two modulation / demodulation devices is connected to the second transformer winding. In particular, by means of the primary-side of the two modulation / demodulation devices, i.e. by means of the modulation / demodulation device which is connected to that transformer winding to which an alternating current is applied to generate a corresponding induced current in the other transformer winding, data and / or signals are available the alternating current used can be modulated. The data and / or the signals can be extracted from the induced alternating current by means of the other (secondary) modulation / demodulation device, i.e. by means of the modulation / demodulation device which is connected to the transformer winding in which a voltage or current is induced (demodulable) and expediently also extracted. The extracted data / or signals can be fed to a control unit connected to the secondary-side modulation / demodulation devices, which are used, for example, to control the electric motor, a battery control system having the traction battery, or other components. The other components are, in particular, actuators, for example for a brake, or lights, such as taillights or turn signals, for example. For example, the inductively transmitted energy is also used to operate the other components.

In summary, when the device is in operation, a signal and / or data is modulated onto the (carrier) alternating current used for inductive transmission by means of the modulation / demodulation device on the primary side. By means of the modulated alternating current, a corresponding current is induced in the transformer winding on the secondary side, which is fed to the modulation / demodulation device on the secondary side. By means of this, the data and / or the signal are extracted (separated) from the induced current. The demodulated alternating current, i.e. the current resulting from the extraction of the data and / or signals from the induced current, is fed to the traction battery connected to the secondary transformer winding or to the electric motor connected to the secondary transformer winding, in particular via the voltage converter or via the converter .

In an advantageous embodiment, a trailer has a trailer drawbar for mechanical coupling with a trailer coupling of a truck. In particular, the trailer has a trailer drawbar of a device according to one of the variants presented above. At most, the trailer drawbar has a drawbar eye for receiving the coupling bolt of the trailer coupling, a (second) transformer winding being integrated into the trailer drawbar. This is wrapped around the towing eye.

If the trailer has a traction battery for an electric motor arranged on the truck, the second transformer winding, in particular between the second transformer winding and the traction Battery connected to a voltage converter. If the trailer has an electric motor which is or is to be supplied by a traction battery arranged on the truck, a converter is connected to the second transformer winding, in particular between the second transformer winding and the electric motor. Additionally or alternatively, a modulation / demodulation device is connected between the first transformer winding and the converter or the voltage converter.

Furthermore, according to an advantageous embodiment, a truck has a trailer coupling, preferably a trailer coupling of a device according to one of the variants shown above, with a coupling bolt for mechanical coupling with a towing eye of a trailer drawbar of a trailer, which trailer is in particular according to one of the variants shown above is trained. Either the trailer coupling has a (first) transformer winding, which is wound around the coupling bolt forming a ferromagnetic (first) core, or the trailer coupling has a U-shaped ferromagnetic (second) core, which is provided with the first transformer winding. The U-legs of the second core face the coupling bolt. In a closed position of the coupling bolt, in this second alternative, a transformer core is formed by means of the coupling bolt and by means of the ferromagnetic second core.

For example, a converter or a voltage converter and additionally or alternatively a modulation / demodulation device are connected to the first transformer winding in a manner analogous to the explanations presented above with regard to the trailer.

In an expedient embodiment, a truck has a truck in one of the variants presented above and a trailer in one of the variants presented above. The trucks and the trailer are mechanically and inductively coupled to one another by means of the trailer coupling and by means of the coupling bolt.

In a first operating mode, which is used to drive the truck, the transformer winding connected to the traction battery, i.e. the first or the second transformer winding, depending on the design of the truck, has a voltage between 0 V and 1500 V and / or a current with a current intensity between 0 A and 1500 A flows through it. A voltage with an amount between 0 V and 1500 V or a current with a current with an amount between 0 A and 1500 A is or will be induced on the second or first transformer winding connected to the electric motor.

Additionally or alternatively, in a second operating mode, which is used for recuperative charging of the traction battery, the first or second transformer winding connected to the electric motor has a voltage between 0 V and 1500 V applied to it and / or a current with a current strength with an amount between 0 A and 1500 A. At the second or first transformer winding connected to the traction battery, a voltage between 0 V and 1500 V or a current with a current strength between 0 A and 1500 A is induced.

In particular, the device is designed to transmit energy, data and / or control signals both from the trailer to the truck and from the truck to the trailer.

In summary, the electric motor can be supplied with electrical energy by means of inductive energy transmission for driving the truck. For example, the electric motor only uses the inductively transmitted energy to drive the truck. Alternatively, the truck has a further, second traction battery connected to the electric motor, which is arranged in the truck if the electric motor is arranged in the truck, or which is arranged in the trailer if the electric motor is arranged in the truck. In this case, the inductively transmitted energy supports the second traction battery. In other words, the inductively transmitted energy is used to operate the electric motor in addition to an energy provided by the second traction battery, in particular when the truck is accelerating.

• 1 in einer schematischen Seitenansicht einen Lastzug mit einem Anhänger und mit einem Lastkraftwagen, wobei der Anhänger eine Anhängerdeichsel einer Vorrichtung aufweist, welche mit einer Anhängerkupplung der Vorrichtung für den Lastkraftwagen mechanisch gekoppelt ist, und wobei der Anhänger und die Anhängerkupplung eine zweite Transformatorwicklung bzw. eine erste Transformatorwicklung aufweisen, mittels welchen eine Traktions-Batterie des Anhängers mit einem Elektromotor des Lastkraftwagen induktiv gekoppelt sind,
• 2a schematischen in einer perspektivischen Ansicht die Vorrichtung gemäß einer ersten Variante, wobei ein Kupplungsbolzen der Anhängerkupplung in einer Zugöse der Anhängerdeichsel aufgenommen ist, und wobei der Kupplungsbolzen einen gemeinsamen ferromagnetischen Kern für eine um die Zugöse gewickelte zweite Transformatorwicklung der Anhängerdeichsel und für eine erste Transformatorwicklung der Anhängerkupplung bildet,
• 2b schematischen in einer Seitenansicht die erste Variante der Vorrichtung mit Kupplungsmaul der als Maulkupplung ausgebildeten Anhängerkupplung,
• 3a schematisch in einer Seitenansicht die Vorrichtung gemäß einer zweiten Variante, gemäß welcher die Anhängerkupplung einen U-förmigen zweiten Kern aufweist, der mit der ersten Transformatorwicklung versehen ist, wobei dessen U-Schenkel dem Kupplungsbolzen zugewandt sind, und
• 3b schematisch in einer Draufsicht die Vorrichtung gemäß der zweiten Variante.

Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. Show in it:

• 1 a schematic side view of a truck with a trailer and a truck, the trailer having a trailer drawbar of a device which is mechanically coupled to a trailer coupling of the device for the truck, and wherein the trailer and the trailer coupling have a second transformer winding and a first Have transformer winding, by means of which a traction battery of the trailer is inductively coupled to an electric motor of the truck,
• 2a Schematic in a perspective view of the device according to a first variant, wherein a coupling bolt of the trailer coupling is received in a drawbar eye of the trailer drawbar, and wherein the coupling bolt has a common ferromagnetic core for a second transformer winding of the trailer drawbar wound around the drawbar eye and for a first transformer winding of the trailer coupling forms,
• 2 B a schematic side view of the first variant of the device with the coupling mouth of the trailer coupling designed as a mouth coupling,
• 3a schematically in a side view the device according to a second variant, according to which the trailer hitch has a U-shaped second core which is provided with the first transformer winding, the U-legs of which face the coupling bolt, and
• 3b schematically in a plan view the device according to the second variant.

Corresponding parts and sizes are always provided with the same reference symbols in all figures.

In the 1 is a truck 2 with a truck 4th and with a trailer 6th shown. To drive the truck 2 instructs the truck 4th an electric motor 8th on which from a traction battery 10 of the trailer 6th is supplied with electrical energy. For the inductive transmission of electrical energy from the traction battery 10 of the trailer 6th to the electric motor 8th instructs the truck 2 a device 12 on.

The device 12 includes a trailer drawbar 14th , which on a (frame) chassis 16 of the trailer is attached, and a trailer coupling 18th which on the truck 4th is mounted.

The trailer drawbar 14th has a towing eye 20th on, in which a coupling bolt 22nd the trailer coupling 18th is recorded ( 2a to 3b) so that the trailer 6th by truck 4th is mechanically coupled.

The trailer coupling also has a first transformer winding 24 which to the electric motor 8th and the trailer drawbar 14th a second transformer winding 26th on which to the traction battery 10 connected. By means of the two transformer windings 24 and 26th is therefore an inductive transfer of electrical energy from the traction battery 10 to the electric motor 8th enables. So are the electric motor 8th and the traction battery 10 by means of the two transformer windings 24 and 26th inductively coupled to one another.

In the 2a , 2 B and 3a , 3b two variants of the devices are shown. These two variants are in the 1 summarized schematically as a transformer, with first transformer winding 24 the trailer coupling 18th and the second transformer winding 26th the trailer drawbar 14th assigned.

As continued in the 1 is shown, the device 12 furthermore a voltage converter 28 on that to the second transformer winding 26th and to the traction battery 10 connected. This converts to drive the truck 2 those from the traction battery 10 DC voltage provided or that of the traction battery 10 provided direct current into an alternating voltage necessary for inductive transmission or the alternating current necessary for inductive transmission. In addition, the voltage converter converts 28 in the course of a recuperation in the second transformer winding 26th induced alternating voltage or the alternating current induced there in a for charging the traction battery 10 suitable direct voltage or a corresponding direct current.

The device also includes 12 a converter 30th attached to the first transformer winding 24 connected. This converts the from the electric motor 8th alternating voltage or alternating current provided in the course of recuperation into an alternating voltage or alternating current, the frequency of which for the inductive transmission of energy by means of the transformer windings 24 and 26th suitable is. The converter continues to convert 30th to drive the truck 2 those in the first transformer winding 24 induced alternating voltage or the alternating current induced there into one for operating the electric motor 8th suitable alternating voltage or a corresponding alternating current.

In summary, the device 12 a battery-side voltage converter 28 and a motor-side converter 30th on.

Between the second transformer winding 26th and the voltage converter 28 as well as between the first transformer winding 24 and the converter 30th is a modulation / demodulation device 32 switched. By means of the modulation / demodulation devices 32 data and / or signals can be modulated onto the alternating current used for inductive energy transmission. By means of the primary side of the two modulation / demodulation devices 32 , are so Data and / or signals can be modulated onto the alternating current used. By means of the other (secondary) modulation / demodulation device 32 , the data and / or the signals are extracted.

An example is in the 1 a control unit 34 of the truck 4th shown which with the one with the first transformer winding 24 connected modulation / demodulation device 32 connected is. The means of this modulation / demodulation device 32 extracted data / and or signals are sent to the control unit 34 supplied, and are used, for example, to control the electric motor 8th .

In a first operating mode for driving the truck trailer 2 , which is also referred to as the drive mode, is the one on the traction battery 10 connected second transformer winding 26th A voltage with an amount between 0 V and 1500 V is applied and / or a current with an amperage with an amount between 0 A and 1500 A flows through it. On the one on the electric motor 8th connected first transformer winding 24 a voltage with an amount between 0 V and 1500 V or a current with a current with an amount between 0 A and 1500 A is induced.

In a second operating mode for recuperative charging of the traction battery 10 is the one to the electric motor 8th connected first transformer winding 24 A voltage with an amount between 0 V and 1500 V is applied and / or a current with an amperage with an amount between 0 A and 1500 A flows through it. On the one on the traction battery 10 connected second transformer winding 26th a voltage with an amount between 0 V and 1500 V or a current with a current with an amount between 0 A and 1500 A is induced.

In summary, the trailer points 6th the trailer drawbar 14th the device 12 and the truck 4th the trailer hitch 18th the device 12 on.

According to an alternative embodiment of the device, not shown further 12 and the truck 2 the trailer instructs 6th the electric motor 8th and the truck 4th the traction battery 10 on. The remarks on the device 12 , to the truck 2 , to the trailer 6th and to the truck 4th apply analogously to the variant shown above, with the exception of the following. According to this alternative embodiment, the voltage converter is 28 between the first transformer winding 24 and the traction battery 10 and the converter 30th between the second transformer winding 26th and the electric motor 8th of the trailer 6th switched.

In the 2a and 2 B is the first variant of the device 12 shown. Here is the first transformer winding 24 around the coupling bolt 22nd wrapped. In other words, it is the coupling bolt 22nd with the first transformer winding 24 Mistake. The coupling bolt protrudes 22nd via a coupling jaw 36 the trailer coupling designed as a so-called jaw coupling 18th out ( 2 B) . The first transformer winding 24 is outside one of the coupling jaws 36 the trailer coupling 18th formed receiving space for the towing eye 20th arranged. According to an alternative not shown further, the first transformer winding 24 around the coupling bolt 22nd wrapped, but within the coupling jaw 36 the trailer coupling 18th formed receiving space for the towing eye 20th arranged.

In a closed position of the coupling bolt 22nd , so when this is received in the drawbar eye, the coupling pin forms 22nd a common (first) ferromagnetic core for both transformer windings 24 and 26th . The first transformer winding 24 and the second transformer winding 26th are along the longitudinal direction (extension direction) of the coupling bolt 22nd arranged one behind the other, their winding axes (coil axes) being the same.

In the 3a and 3b is the second variant of the device 12 shown. Here, the trailer coupling 18th a U-shaped second ferromagnetic core 38 on. The short as the second core 38 designated second ferromagnetic core 38 thus has two spaced apart and parallel U-legs 40 and a U-connecting leg connecting them 42 on. The first transformer winding 24 is around the U-connecting leg 42 wrapped.

Furthermore, the U-legs are 40 on the free end of the coupling bolt 22nd facing, wherein in a closed position of the coupling bolt 22nd by means of this and by means of the second ferromagnetic core 38 a transformer core is formed. The coupling bolt is in the closed position 22nd from the second transformer winding 26th the trailer drawbar 14th includes. A longitudinal axis of the coupling bolt 22nd is in one by means of the two U-legs 40 and by means of the U-connecting legs 42 arranged on the spanned plane.

The coupling bolt 22nd is designed as a circular cylinder. To avoid or at least reduce a magnetic stray field at the free ends of the U-legs 40 are these on the free-end, inward, i.e. towards the U-connecting leg 42 , arched. The curvature is semicircular, so that a contact surface between the Coupling bolt 22nd and the (free) ends of the U-legs 40 is enlarged.

In the 3a and 3b is for the purpose of better visibility of the coupling bolts 22nd dotted that of the coupling jaw 36 concealed section of the trailer drawbar 14th dash-dotted lines and in the 3a the second core 38 shown in dashed lines.

The invention is not restricted to the exemplary embodiment described above. Rather, other variants of the invention can also be derived from this by the person skilled in the art without departing from the subject matter of the invention. In particular, all of the individual features described in connection with the exemplary embodiment can also be combined with one another in other ways without departing from the subject matter of the invention.

List of reference symbols

2

articulated lorry

4th

Trucks

6th

pendant

8th

Electric motor

10

Traction battery

12

contraption

14th

Trailer drawbar

16

chassis

18th

trailer hitch

20th

Towing eye

22nd

Coupling bolt / first ferromagnetic core

24

first transformer winding

26th

second transformer winding

28

Voltage converter

30th

Converter

32

Modulation / demodulation device

34

Control unit

36

Coupling jaw

38

second ferromagnetic core

40

U-leg

42

U-connecting leg

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 6222443 B1 [0005]

Claims (9)

Device (12) for inductive energy transfer between a traction battery (10) and an electric motor (8) of a truck (2) with a truck (4) and with a trailer (6), the truck (4) having the traction battery (10) or the electric motor (8) having - a trailer coupling (18) with a coupling bolt (22) and with a first transformer winding (24), - A trailer drawbar (14) with a drawbar eye (20) for the coupling bolt (22), and with a second transformer winding (26) integrated into the trailer drawbar (14), the drawbar eye (20) being wrapped by the second transformer winding (26) , and wherein the coupling bolt (22) forms a first ferromagnetic core for the second transformer winding (26) when this is received in the drawbar eye (20). Device (12) after Claim 1 , characterized in that the first transformer winding (24) is wound around the coupling bolt (22). Device (12) after Claim 1 , characterized in that the trailer coupling (18) has a U-shaped second ferromagnetic core (38) around which the first transformer winding (24) is wound, and whose U-legs (40) face the coupling bolt (22), wherein in a closed position of the coupling bolt (22) by means of this and by means of the second ferromagnetic core (38) a transformer core is formed. Device (12) after Claim 3 , characterized in that the ferromagnetic core (38) on its U-legs (40) is curved inward on the free-end side, in particular in an arcuate, preferably semicircular manner. Device (12) according to one of the Claims 1 to 4th , characterized by - a voltage converter (28) which is connected to the first transformer winding (24) if the traction battery (10) is provided for the truck (4), or which is connected to the second transformer winding (26), if the traction battery (10) is provided for the trailer (6), and - a converter (30) which is connected to the first transformer winding (24) if the electric motor (8) is provided for the truck (4) , or which is connected to the second transformer winding (26), provided that the electric motor (8) is provided for the trailer (6). Device (12) according to one of the Claims 1 to 5 , characterized by two modulation / demodulation devices (32) which are connected to the first transformer winding (24) and to the second transformer winding (26), wherein by means of the modulation / demodulation devices (32) data and / or signals to the AC current used inductive energy transmission can be modulated. Trailer (6) with a trailer drawbar (14), in particular a device (12) according to one of the Claims 1 to 6th , for mechanical coupling to a trailer coupling (18) of a truck (4), the trailer drawbar (14) having a towing eye (20) for a coupling bolt (22) of the trailer coupling (18), and wherein the trailer drawbar (14) has a transformer winding (26) is integrated, which is wrapped around the drawbar eye (20). Lorry (4) with a trailer coupling (18), in particular a device (12) according to one of the Claims 1 to 6th , with a coupling bolt (22) for mechanical coupling with a drawbar eye (20) of a trailer drawbar (14), - wherein the trailer coupling (18) has a transformer winding (24) which is wound around the coupling bolt (22), or - wherein the Trailer coupling (18) has a U-shaped ferromagnetic core (38) around which the transformer winding (24) is wound, the U-legs (40) of the ferromagnetic core (38) facing the coupling bolt (22), and wherein in a closed position of the coupling bolt (22) is formed by means of this and by means of the ferromagnetic core (38) a transformer core. Truck (2) with a truck (4) after Claim 8 as well as with a trailer (6) Claim 7 , wherein the truck (4) and the trailer (6) are mechanically and inductively coupled to one another by means of the trailer coupling (18) and by means of the trailer drawbar (14), - in a first operating mode for driving the truck (2) the traction -Battery connected transformer winding (24 or 26) with a voltage with an amount between 0 V and 1500 V and / or with a current with a current with an amount between 0 A and 1500 A flowing through it, whereby the to the electric motor ( 8th) connected transformer winding (26 or 24) a voltage with an amount between 0 V and 1500 V or a current with a current with an amount between 0 A and 1500 A is induced or is, and / or - wherein in a second operating mode for recuperative charging of the traction battery (10), the transformer winding (24 or 26) connected to the electric motor (8) is charged with a voltage with an amount between 0 V and 1500 V and / or with a current with a current intensity with an amount between 0 A and 1500 A is flowing through, whereby on the transformer winding (26 or 24) connected to the traction battery (10) a voltage with an amount between 0 V and 1500 V or a current with an amperage with an amount between 0 A and 1500 A is or will be induced.

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