DE102022124425A1 - Electrically driven truck mixer - Google Patents

Abstract

The invention relates to a truck mixer (1) with a chassis (2) and a structure (3), the chassis (2) having at least one drive axle (5) driven by a chassis drive (4) for moving the truck mixer (1). and wherein the structure (3) has a mixer drum (7) driven in rotation by a drum drive (6). It is the object of the invention to provide an improved truck mixer which enables a significant reduction or avoidance of exhaust gases while the truck mixer is moving and when filling and emptying the mixer drum. For this purpose, the invention proposes that the chassis drive (4) and the drum drive (6) are electric drives, with a high-voltage battery (8) of the truck mixer (1) being set up to drive both the chassis drive (4) and the drum drive (6). to supply electrical energy, the truck mixer (1) having a low-voltage battery (9) assigned to the structure (3), which is intended to supply additional consumers (14, 15, 16, 17, 18, 19, 20, 21, 22) of the structure (3) with electrical energy, the truck mixer (1) having an input side with the high-voltage battery (8) and an output side with the low-voltage battery (9) and the auxiliary consumers (14, 15, 16, 17, 18, 19, 20 , 21, 22) connected DC/DC voltage converter (10), which is designed to charge the low-voltage battery (9) with electrical energy from the high-voltage battery (8).

Description

The invention relates to a truck mixer with a chassis and a structure, wherein the chassis has at least one drive axle driven by a chassis drive for moving the truck mixer, and wherein the structure has a mixer drum driven in rotation by a drum drive.

Such a truck mixer has been known for a long time. Until now, the chassis drive of such a truck mixer has usually been provided with an internal combustion engine. The drum drive of such a truck mixer is usually a hydraulic drive, which in turn is driven by the internal combustion engine. The disadvantage of such a truck mixer is the significant emission of exhaust gases by the internal combustion engine while the truck mixer is moving and when filling and emptying the mixer drum.

It is therefore the object of the invention to provide an improved truck mixer which enables a significant reduction or avoidance of exhaust gases while the truck mixer is moving and when filling and emptying the mixer drum.

This task is solved by a truck mixer with the features of claim 1.

Because the chassis drive and the drum drive are electric drives, with a high-voltage battery of the truck mixer being set up to supply both the chassis drive and the drum drive with electrical energy, a significant reduction or avoidance of exhaust gases can be achieved while the truck mixer is moving and when filling and emptying the mixer drum. The chassis drive can be a fully electric drive, which results in a complete avoidance of exhaust gases during operation of the truck mixer. The chassis drive can also be partially electric in the form of a hybrid drive, i.e. an electric drive in combination with an internal combustion engine. The truck mixer advantageously has a low-voltage battery assigned to the body, which is intended to supply auxiliary consumers of the body with electrical energy. By supplying the body's auxiliary consumers, numerous functions of the truck mixer can easily be powered electrically with a low-voltage power supply. Advantageously, the truck mixer according to the invention has a DC/DC voltage converter, which is connected on the input side to the high-voltage battery and on the output side to the low-voltage battery and the auxiliary consumers. The electrical energy provided by the high-voltage battery via the input of the DC/DC voltage converter is used at the output of the DC/DC voltage converter after a voltage conversion to the low-voltage range to charge the low-voltage battery. This makes it possible to realize a particularly simply constructed truck mixer with electric drives. In particular, the structure does not have its own high-voltage battery, i.e. assigned to the structure, for the electrical supply of the drum drive. In addition, the secondary consumers can be supplied by the body's low-voltage battery, at least temporarily, independently of the high-voltage battery. Furthermore, the supply of the auxiliary consumers is possible permanently independent of a low-voltage voltage supply to the chassis. The permanent supply of the drum drive and the auxiliary consumers via the high-voltage battery of the chassis makes connecting the structure very easy. If there is a malfunction in the chassis' high-voltage battery, the body's auxiliary consumers can temporarily continue to be supplied with electrical energy from the body's low-voltage battery. This makes the truck mixer particularly safe in the event of a high-voltage battery failure.

The truck mixer can be designed as a truck, with the truck comprising the supporting chassis and the body being built on the supporting chassis of the truck. The truck mixer can also be designed as a tractor-trailer, with the tractor-trailer being made up of a tractor unit comprising the chassis and a semitrailer comprising the body.

Advantageous refinements and further developments of the invention result from the dependent claims. It should be noted that the features listed individually in the claims can also be combined with one another in any technologically sensible manner and thus show further refinements of the invention.

According to an advantageous embodiment of the invention, it is provided that the DC/DC voltage converter is also intended to supply the auxiliary consumers with electrical energy from the high-voltage battery. The direct supply of the auxiliary consumers with electrical energy from the DC/DC voltage converter makes it possible to operate the auxiliary consumers of the body with electrical energy from the high-voltage battery of the chassis, i.e. independently of the capacity of the low-voltage battery.

Particularly preferred is an embodiment which provides that an inverter assigned to the chassis is connected to the high-voltage battery on the input side and to the high-voltage battery on the output side Chassis drive is connected. The inverter assigned to the chassis is used to supply the chassis drive with alternating voltage, which is converted from the direct voltage of the high-voltage battery in the inverter.

A particularly advantageous embodiment of the invention relates to the fact that an inverter assigned to the structure is connected to the high-voltage battery on the input side and to the drum drive on the output side. The alternating fuse assigned to the structure is used to supply the drum drive with alternating voltage, which is converted from the direct voltage of the high-voltage battery in the inverter. The inverter is preferably a 750VDC/400VAC converter or 400VDC/400VAC converter.

A particularly advantageous embodiment of the invention provides that the inverter assigned to the structure and the DC/DC voltage converter are connected to the high-voltage battery via the same high-voltage connection. The high-voltage connection for connecting the inverter assigned to the body and the DC/DC voltage converter offers a simple way to electrically connect the body to the chassis. When manufacturing the truck mixer, prefabricated chassis from established manufacturers that offer a high-voltage connection can be used. The DC/DC voltage converter preferably converts the DC voltage of, for example, 400 or 750 V provided by the high-voltage battery into 24 V DC for the low-voltage range. The high-voltage connection can be monitored via HV interlock. In addition, an input signal from a control device of the body can be detected via relays, which indicates that the chassis is in operation. In addition to the high-voltage connection, a CAN data bus can also be provided so that the chassis and the structure of the truck mixer can communicate with each other.

• - Scheinwerfer,
• - Wasserpumpe,
• - Aktor einer Auslaufschurre,
• - Aktor eines Einfüll-Schwenktrichters,
• - Aktor eines Trommelverschlussdeckels,
• - Kühlvorrichtung, eingerichtet zur Kühlung des Trommelantriebs,
• - Steuereinrichtung,
• - Bedieneinrichtung und
• - elektrisch betätigbare Bremse zum Abbremsen der Drehbewegung der Mischertrommel sind.

An advantageous embodiment of the invention provides that one or more additional consumers of the structure from the group

• - headlights,
• - Water pump,
• - Actuator of an outlet chute,
• - actuator of a filling swivel funnel,
• - actuator of a drum closure lid,
• - Cooling device, set up to cool the drum drive,
• - control device,
• - Control device and
• - Electrically actuated brake for braking the rotational movement of the mixer drum.

The headlight of the body can be work lights that illuminate the area around the truck mixer for safe work in the dark. The headlight, as an additional consumer of the body, can easily be supplied with electrical energy in the low-voltage range from the low-voltage battery assigned to the body or the DC/DC voltage converter. This can be done directly by the low-voltage battery or the DC/DC voltage converter or via the body's control device. The headlight preferably has a maximum input power in the range of 75-100 watts.

The body's water pump is used to generate the required water pressure in a body's water system. The water system in the body serves, on the one hand, to clean the truck mixer after use and, on the other hand, to improve the flowability of the mixed material in the mixer drum by adding water if necessary. The water pump can simply be connected to the low-voltage battery or the DC/DC voltage converter via an inverter. The inverter for controlling the water pump can therefore be supplied directly with 24 V from the low-voltage battery and controlled by the body control device via a CAN data bus.

The actuator of the outlet chute is used to movably adjust the outlet chute so that filling hoppers of truck-mounted concrete pumps or concrete silos for filling with mixed material from the mixer drum are easily accessible. To electrically adjust the outlet chute, the actuator in the low-voltage range is supplied with electrical energy from the low-voltage battery or the DC/DC voltage converter. The actuator of the outlet chute preferably has a maximum input power of 300 watts.

The actuator for the swivel filling funnel is used for the movable adjustment of the swivel filling funnel, which simplifies the filling of the mixer drum with mixing material. For the electrical adjustment of the swivel filling funnel, the actuator in the low-voltage range is supplied with electrical energy from the low-voltage battery or the DC/DC voltage converter. The actuator for the swivel filling funnel preferably has a maximum input power of 300 watts, in the case of two closure actuators twice 300W.

The sealing lid of the mixer drum can be electrically closed via the drum closure lid actuator. To close the mixer drum, the drum closure lid is moved over the actuator, which is supplied with electrical energy from the low-voltage battery or the DC/DC voltage converter in the low-voltage range. The actuator for the drum closure lid preferably has a maximum input power of 300 watts.

Another auxiliary consumer, which is supplied with low-voltage voltage from the body's low-voltage battery or the DC/DC voltage converter, represents the cooling device, which takes over the cooling of the drum drive and other components. The cooling device preferably has a maximum input power of 600 watts.

Furthermore, as an additional consumer, the control device of the body can also be operated with low-voltage voltage from the low-voltage battery of the body or the DC/DC voltage converter in order to control the functions of the truck mixer. The control device itself can provide a voltage supply in the low-voltage range for other auxiliary consumers in the body. The body's low-voltage battery ensures that the body's auxiliary consumers are controlled via the control device. In addition, the voltage supply from the low-voltage battery provides electrical energy to drive the auxiliary consumers.

Another auxiliary consumer of the structure can be the operating device for operating the truck mixer. This operating device can be formed by input and output units at the rear, in the driver's cab or by remote controls and can be easily supplied with low-voltage voltage from the low-voltage battery of the body or the DC/DC voltage converter. The operating device preferably has a maximum input power of 24 watts per input and output unit.

The low-voltage battery of the body preferably supplies all of the auxiliary consumers of the body with a low voltage of 24 volts. Auxiliary consumers such as the actuators for the discharge chute, the swivel filling funnel and the drum cover as well as the cooling device are preferably supplied directly with 24V from the low-voltage battery of the body and controlled by an I/O interface of the control device via relays on the respective auxiliary consumer. The work light with a low power consumption is preferably supplied with voltage directly from the control device and thus controlled. The auxiliary consumers can be supplied via the DC/DC voltage converter and the low-voltage battery in parallel or optionally.

Of particular advantage is the supply of an electrically operated brake for slowing down the rotary movement of the mixer drum with low voltage from the low-voltage battery of the body, because the rotary movement of the mixer drum can thus be reliably stopped via the low-voltage battery of the body even if the high-voltage battery of the chassis fails.

Particularly advantageous is an embodiment which provides that the possible instantaneous electrical input power of a single auxiliary consumer or several of the auxiliary consumers together exceeds the maximum electrical output power of the DC/DC voltage converter, the low-voltage battery being intended and designed to cover the difference between the possible instantaneous To provide the input power of the additional consumer(s) and the maximum output power of the DC/DC voltage converter over a limited period of time. The short-term maximum input power of an additional electrical consumer can exceed the maximum output power of the DC/DC voltage converter. At least temporarily, the low-voltage battery can then make the difference between the maximum input power of the electrical auxiliary consumer and the maximum output power of the DC/DC voltage converter available to the auxiliary consumer. The maximum input power of several auxiliary consumers operated at the same time can also exceed the maximum output power of the voltage converter. In this way, the low-voltage battery can make the difference between the maximum input power of the auxiliary consumers and the maximum output power of the DC/DC voltage converter available to the simultaneously operated auxiliary consumers. The additional consumers can be, for example, a work light with a low power consumption or a water pump with a power consumption of up to 4 kW. The low-voltage battery thus serves as an energy buffer storage in order to be able to provide sufficient energy during peaks in the power consumption of the additional consumers and thus avoid malfunctions. This also applies in situations in which the drum drive requires all or almost all of the output power available from the high-voltage battery. In these situations, no (sufficient) electrical energy can be provided from the high-voltage battery via the DC/DC voltage converter. However, the additional consumers continue to be safely supplied from the low-voltage battery.

The possible current electrical input power of a single auxiliary consumer or several of the auxiliary consumers together can therefore be the maximum electrical output power of the DC/DC voltage converter, which enables the use of a weaker, ie smaller-sized DC/DC voltage converter. The difference between the possible current input power of the auxiliary consumer(s) and the maximum output power of the DC/DC voltage converter can be provided via the low-voltage battery over a limited period of time. In particular, this makes it possible to absorb higher inrush currents from the auxiliary consumers in the body's low-voltage power supply.

The auxiliary consumers usually only run for a short time, preferably less than 10 minutes, so that the DC/DC voltage converter can recharge the low-voltage battery in the breaks in between. Suitable DC/DC voltage converters deliver an output power of 3kW to 6.5kW.

An advantageous embodiment provides that the low-voltage battery is designed to supply at least one additional consumer of the structure with electrical energy even if the DC/DC voltage converter and/or the high-voltage battery fails. This means that the body's additional consumers can be operated independently of the chassis' high-voltage battery and the DC/DC voltage converter, which ensures additional safety for the truck mixer.

According to a preferred embodiment of the invention, it is provided that the at least one auxiliary consumer is an electrically actuated brake for braking the rotational movement of the mixer drum. The brake is powered by the low voltage battery to open it and closes automatically if the brake power supply fails or is switched off. The body's low-voltage battery can be used to reliably stop the rotation of the mixer drum even if the chassis' high-voltage battery fails, even if the DC/DC voltage converter no longer supplies low-voltage voltage.

For example, it can be provided that when a minimum charge state of the high-voltage battery of the chassis is reached, the power output to the structure of the truck mixer is reduced or interrupted so that the driving energy of the chassis is still sufficient to reach a charging station for charging the high-voltage battery. Even in this situation, the low-voltage battery still provides sufficient energy for the additional consumers.

A particularly advantageous embodiment is that none of the auxiliary consumers of the body is supplied with electrical energy via a low-voltage power supply assigned to the chassis. The independent supply of the body's additional consumers makes the body's electrical connection flexible for different chassis. The lack of use of the low-voltage power supply assigned to the chassis for the body's auxiliary consumers makes changes to the chassis in the area of the low-voltage power supply unnecessary. In addition, different potentials of a low-voltage voltage supply for the chassis and that of the body do not play a role, which could lead to complex problems. If both the inverter assigned to the body and the DC/DC voltage converter of the body are supplied with electrical energy from the high-voltage battery of the chassis via the same high-voltage connection, the chassis only needs to be able to supply sufficient energy via the high-voltage connection to operate the drum drive on the to provide structure.

• 1 erfindungsgemäßer Fahrmischer,
• 2 Spannungsversorgung des Fahrmischers, und
• 3 Steuerleitungen des Fahrmischers.

Further features, details and advantages of the invention emerge from the following description and from the drawings, which show an exemplary embodiment of the invention. Corresponding objects or elements are provided with the same reference numbers in all figures. Show it:

• 1 truck mixer according to the invention,
• 2 Power supply for the truck mixer, and
• 3 Control lines of the truck mixer.

In the 1 Designated by reference number 1, a truck mixer according to the invention is shown. Such a truck mixer 1 is used in particular to transport concrete from the concrete mixing plant to the construction site. The truck mixer 1 shown here is designed as a truck, the truck comprising a supporting chassis 2 and a structure 3 which is built on the supporting chassis 2 of the truck. The truck mixer can also be designed as a tractor-trailer, the tractor-trailer being formed from a tractor comprising the chassis and a semi-trailer comprising the body (not shown). In both cases, the chassis 2 has at least one drive axle 5 driven by a chassis drive 4 for moving the truck mixer 1. The structure 3, on the other hand, has a mixer drum 7 which is driven in rotation by a drum drive 6. According to the invention, the chassis drive 4 and the drum drive 6 are designed as electric drives, so that electrical energy is used to move the truck mixer 1 and to rotate the mixer flow mel 7 is used. For this purpose, a high-voltage battery 8 is provided in the truck mixer 1, which supplies both the chassis drive 4 and the drum drive 6 with electrical energy. This high-voltage battery 8 is assigned to the chassis 2 of the truck mixer 1. The truck mixer 1 also has an inverter 11 assigned to the chassis 2 ( 2 and . 3), which is connected to the high-voltage battery 8 on the input side and to the chassis drive 4 on the output side. The structure 3 also includes an inverter 12 ( 2 and . 3), which is connected on the input side to the high-voltage battery 8 and on the output side to the drum drive 6. In addition, the chassis 2 has a low-voltage battery 23 ( 2 and . 3) assigned, which contains the secondary components, such as the controller 24 ( 2 and . 3) of the chassis, the radio and the air conditioning for the driver's cab 25 as well as the headlights 26 and rear lights of the chassis 2, etc. are supplied with electrical energy in the low-voltage range of preferably 24V. The truck mixer 1 according to the invention also has a low-voltage battery 9 assigned to the structure 3. This low-voltage battery 9 is intended to supply various auxiliary consumers 14, 15, 16, 17, 18, 19, 20, 21, 22 of the structure 3 with electrical energy.

The shows this 2 a schematic overview of the power supply to the truck mixer 1 according to 1 . The components 4, 11, 8, 27 and the secondary components 23, 24 of the chassis 2 are combined here in one block. The consumers and auxiliary consumers of structure 3 are also combined into a block here. The chassis 2 and the body 3 are connected to one another via a high-voltage connection 13. A circuit breaker 27 is provided on the high-voltage connection 13 on the chassis 2 in order to be able to disconnect the connection to the body 3. The structure 3 has a power distribution unit 28 to distribute electrical energy from the high-voltage battery 8 of the chassis 2 from the high-voltage connection 13. The power distribution unit 28 preferably includes circuit breakers to protect the structure 3. The truck mixer 1 has an input side with the high-voltage battery 8 and an output side with the low-voltage battery 9 and the auxiliary consumers 14, 15, 16, 17, 18, 19, 20, 21, 22 connected DC/DC voltage converter 10. This DC/DC voltage converter 10 is used to charge the low-voltage battery 9 with electrical energy from the high-voltage battery 8. This makes it possible to implement a particularly simply constructed truck mixer 1 with electric drives, since the structure 3 does not have to have its own high-voltage battery 8 to supply the drum drive 6 with electricity. In addition, the supply of the additional consumers 14, 15, 16, 17, 18, 19, 20, 21, 22 via the low-voltage battery 9 of the structure 3 is possible temporarily independently of the high-voltage battery 8. In addition, a permanent supply of the auxiliary consumers 14, 15, 16, 17, 18, 19, 20, 21, 22 is possible independently of a low-voltage voltage supply 23 of the chassis 2. Therefore, no changes to the chassis 2 are necessary in order to supply the auxiliary consumers 14, 15, 16, 17, 18, 19, 20, 21, 22 of the body 3 with electrical energy. The DC/DC voltage converter 10 can also supply the auxiliary consumers 14, 15, 16, 17, 18, 19, 20, 21, 22 directly with electrical energy from the high-voltage battery 8. The inverter 12 assigned to the structure 3 and the DC/DC voltage converter 10 are connected to the high-voltage battery 8 via the same high-voltage connection 13. If the electrical input power of a single auxiliary consumer 14, 15, 16, 17, 18, 19, 20, 21, 22 or several auxiliary consumers 14, 15, 16, 17, 18, 19, 20, 21, 22 operated simultaneously exceeds the maximum electrical power Output power of the DC/DC voltage converter 10, the low-voltage battery 9 of the structure 3 can measure the difference between the current input power of the auxiliary consumer(s) 14, 15, 16, 17, 18, 19, 20, 21, 22 and the maximum output power of the Provide DC/DC voltage converter 10 over a limited period of time. In particular, higher inrush currents of the auxiliary consumers 14, 15, 16, 17, 18, 19, 20, 21, 22 can be absorbed in the low-voltage power supply of the structure 3, and a DC/DC voltage converter 10 can be used, which has a has maximum electrical output power, which is below the possible input power of the auxiliary consumer(s) 14, 15, 16, 17, 18, 19, 20, 21, 22. The low-voltage battery 9 of the structure 3 can also be used if the DC/DC voltage converter 10 fails and/or if the high-voltage battery 8 fails, for example due to a low charge level, the auxiliary consumers 14, 15, 16, 17, 18, 19, 20, 21, 22 of the structure 3 supply with electrical energy.

An additional consumer can be an electrically actuated brake 22 for braking the rotational movement of the mixer drum 7. The rotary movement of the mixer drum 7 can be reliably stopped using the brake 22 via the low-voltage battery 9 of the body, even if the high-voltage battery 8 of the chassis 2 fails. The brake 22 is powered by the low-voltage battery 9 to open it and closes automatically if the power supply fails or is switched off. The brake 22 should not close too quickly in regular operation so that the complete system does not wobble too much. Abruptly braking a fully loaded mixer drum 7 could cause the truck mixer 1 to tip over. If the high-voltage battery 8 hardly provides any energy in certain driving situations, for example when driving uphill, the mixer drum 7 could operate without the drum drive 6 being powered due to the contents of the drum. The brake 22 would then at least hold the mixer drum 7 in position, whereby the contents of the mixer drum 7 would be calmed.

Further auxiliary consumers of the structure 3 can be headlights 14, a water pump 15, an actuator for the outlet chute 16, an actuator for the filling swivel funnel 17 or an actuator for the drum closure lid 18. The control device 20 of the structure 3 represents a further auxiliary consumer. The headlight 14 as an auxiliary consumer of the structure 3 is simply supplied with electrical energy in the low-voltage range by the low-voltage battery 9 assigned to the structure 3 or the DC/DC voltage converter 10. This can be done directly by the low-voltage battery 9 or the DC/DC voltage converter 10 or, as in 3 indicated, via the control device 20, which provides a voltage supply in the low-voltage range. The pump motor 29 of the water pump 15 can be connected to the low-voltage battery 9 or the DC/DC voltage converter 10 via an inverter 34. The inverter 34 for controlling the water pump 15 can be supplied directly with 24 V from the low-voltage battery 9 and via a CAN data bus 33 ( 3 ) can be controlled by the control device 20 of the structure 3. Furthermore, a cooling device 19 for cooling the drum drive 6 can also be provided as an additional consumer. Another additional consumer of the structure 3 can represent the operating device 21 for operating the truck mixer 1. This operating device 21 can be operated by input and output units at the rear 30 ( 1 ), driver's cab 25 ( 1 ) or be formed by remote controls. The operating device 21 as an additional consumer can also be supplied by the DC/DC voltage converter 10 or the low-voltage battery 9 of the structure 3. It is provided that advantageously none of the auxiliary consumers 14, 15, 16, 17, 18, 19, 20, 21, 22 of the body 3 is supplied with electrical energy via a low-voltage power supply 23 assigned to the chassis 2.

The control device 20 can itself provide a voltage supply in the low-voltage range for other auxiliary consumers of the structure, as in 3 is shown. Additional consumers with a low power consumption, such as the coolant pump of the cooling device 19, or the work lights 14, are advantageously supplied with voltage directly by the control device 20 and thus controlled. The additional consumers, such as the actuators for the outlet chute 16, the filling swivel funnel 17 and the drum closure lid 18, are preferably supplied with 24V from the low-voltage battery 9 of the structure 3 via relay 32 and the power supply from an I / O interface 31 of the control device 20 controlled via relay 32 to the respective auxiliary consumer. The relays 32 are part of the safety technology for safely switching off the auxiliary consumers 16, 17 and 18; these auxiliary consumers are controlled via a CAN data bus connection.

Reference symbol list

1

truck mixer

2

chassis

3

Construction

4

Chassis drive

5

Drive axle

6

Drum drive

7

mixer drum

8th

High voltage battery

9

Low-voltage battery (structure)

10

DC/DC voltage converter

11

First inverter (chassis)

12

Second inverter (structure)

13

High-voltage connection

14

Headlight

15

water pump

16

Actuator of an outlet chute

17

Actuator of a filling swivel funnel

18

Actuator of a drum closure lid

19

Cooling device

20

Control device

21

Operating device

22

brake

23

Low-voltage battery (chassis)

24

Control (chassis)

25

Cab

26

Headlights

27

Circuit breaker

28

Power Distribution Unit (high voltage)

29

pump motor

30

Rear

31

I/O interface

32

relay

33

CAN data bus

34

Third inverter (water pump)

35

Power Distribution Unit (low voltage)

Claims (10)

Truck mixer (1) with a chassis (2) and a body (3), the chassis (2) having at least one drive axle (5) driven by a chassis drive (4) for the traveling movement of the truck mixer (1), and the body (3) having a mixer drum (7) driven in rotation by a drum drive (6), characterized in that the chassis drive (4) and the drum drive (6) are electric drives, a high-voltage battery (8) of the truck mixer (1) being designed to supply both the chassis drive (4) and the drum drive (6) with electrical energy, the truck mixer (1) having a low-voltage battery (9) assigned to the body (3), which is intended to supply secondary consumers (14, 15, 16, 17, 18, 19, 20, 21, 22) of the body (3) with electrical energy, the truck mixer (1) having an input side connected to the High-voltage battery (8) and DC/DC voltage converter (10) connected on the output side to the low-voltage battery (9) and the auxiliary consumers (14, 15, 16, 17, 18, 19, 20, 21, 22), which is designed to charge the low-voltage battery (9) with electrical energy from the high-voltage battery (8). Mixer truck (1). Claim 1 , characterized in that the DC/DC voltage converter (10) is also intended to supply the auxiliary consumers (14, 15, 16, 17, 18, 19, 20, 21, 22) with electrical energy from the high-voltage battery (8). take care of. Mixer truck (1). Claim 1 or 2 , characterized in that an inverter (11) assigned to the chassis (2) is connected on the input side to the high-voltage battery (8) and on the output side to the chassis drive (4). Truck mixer (1) according to one of the preceding claims, characterized in that an inverter (12) assigned to the structure (3) is connected on the input side to the high-voltage battery (8) and on the output side to the drum drive (6). Mixer truck (1). Claim 4 , characterized in that the inverter (12) assigned to the structure (3) and the DC/DC voltage converter (10) are connected to the high-voltage battery (8) via the same high-voltage connection (13). Truck mixer (1) according to one of the preceding claims, characterized in that one or more additional consumers of the structure (3) from the group - headlights (14), - water pump (15), - actuator of an outlet chute (16), - actuator of a filling - swivel funnel (17), - actuator of a drum closure cover (18), - cooling device (19), set up to cool the drum drive (6), - control device (20), - operating device (21) and - electrically actuated brake (22) for braking the rotational movement of the mixer drum (7). Truck mixer (1) according to one of the preceding claims, characterized in that the possible current electrical input power of a single auxiliary consumer (14, 15, 16, 17, 18, 19, 20, 21, 22) or several of the auxiliary consumers (14, 15, 16, 17, 18, 19, 20, 21, 22) together exceeds the maximum electrical output power of the DC/DC voltage converter (10), the low-voltage battery (9) being intended and designed to cover the difference between the possible instantaneous input power of the or the auxiliary consumers (14, 15, 16, 17, 18, 19, 20, 21, 22) and the maximum output power of the DC/DC voltage converter (10) over a limited period of time. Truck mixer (1) according to one of the preceding claims, characterized in that the low-voltage battery (9) is designed to supply at least one auxiliary consumer (14, 15, 16, 17, 18, 19, 20, 21, 22) of the structure (3) to supply electrical energy. Truck mixer (1) to Claim 8 , characterized in that the at least one secondary consumer is the electrically actuated brake (22) for braking the rotary movement of the mixer drum (7). Truck mixer (1) according to one of the preceding claims, characterized in that none of the auxiliary consumers (14, 15, 16, 17, 18, 19, 20, 21, 22) of the body (3) has a low voltage associated with the chassis (2). -Power supply is supplied with electrical energy.

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