Electrically driven truck mixer

Abstract

The invention relates to a truck mixer (1) comprising a chassis (2) and an arrangement (3), wherein the chassis (2) has at least one drive axle (5) driven by a chassis drive (4) for the travelling forward movement of the truck mixer (1), and wherein the arrangement (3) has a mixer drum (7) rotationally driven by a drum drive (6). The object of the invention is to provide an improved truck mixer which allows for a significant reduction or prevention of waste gases during the travelling of the truck mixer and when filling and emptying the mixer drum. According to the invention, the chassis drive (4) and the drum drive (6) are electrical drives, wherein a high-voltage battery (8) of the truck mixer (1) is designed to supply both the chassis drive (4) and the drum drive (6) with electrical energy, wherein the truck mixer (1) has a low-voltage battery (9) associated with the arrangement (3), which is provided to supply auxiliary consumers (14, 15, 16, 17, 18, 19, 20, 21, 22) of the arrangement (3) with electrical energy, wherein the truck mixer (1) has a DC / DC voltage converter (10) which is connected to the high-voltage battery (8) on the input side and to the low-voltage battery (9) and the auxiliary consumers (14, 15, 16, 17, 18, 19, 20, 21, 22) on the output side, and which is designed to charge the low-voltage battery (9) with electrical energy from the high-voltage battery (8).

Description

[0001] Electrically driven truck mixer

[0002] The invention relates to a truck mixer with a chassis and a body, wherein the chassis has at least one drive axle driven by a chassis drive for the traveling movement of the truck mixer, and wherein the body has a mixer drum driven in rotation by a drum drive.

[0003] Such a truck mixer has been known for some time. Until now, the chassis drive of such a truck mixer has usually been equipped with an internal combustion engine. The drum drive of such a truck mixer is usually a hydraulic drive, which in turn is powered by the internal combustion engine. A 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.

[0004] It is therefore an object of the invention to provide an improved truck mixer which enables a significant reduction or avoidance of exhaust gases during the travel of the truck mixer and during filling and emptying of the mixer drum.

[0005] This object is achieved by a truck mixer having the features of claim 1.

[0006] Because the chassis drive and drum drive are electric drives, with a high-voltage battery of the truck mixer being designed to supply both the chassis drive and the drum drive with electrical energy, a significant reduction or elimination of exhaust gases can be achieved while the truck mixer is moving and during filling and emptying of the mixer drum. The chassis drive can be a fully electric drive, which completely eliminates exhaust gases during operation of the truck mixer. However, 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 the body's auxiliary consumers with electrical energy.By supplying the auxiliary consumers of the body, numerous functions of the truck mixer can be driven electrically very easily using a low-voltage power supply. The truck mixer according to the invention advantageously 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 made available 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 body does not have its own high-voltage battery, i.e. one assigned to the body, for electrically supplying the drum drive.In addition, the auxiliary consumers can be supplied by the body's low-voltage battery, at least temporarily, independently of the high-voltage battery. Furthermore, the auxiliary consumers can be supplied permanently, independently of the chassis's low-voltage power supply. The permanent supply of the drum drive and the auxiliary consumers via the chassis's high-voltage battery makes connecting the body very easy. In the event of a malfunction of the chassis' high-voltage battery, the auxiliary consumers of the body 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 enclosing the supporting chassis and the body being mounted on the supporting chassis of the truck.The truck mixer can also be designed as a semi-trailer combination, whereby the semi-trailer combination consists of a tractor unit comprising the chassis and a semi-trailer comprising the body.

[0007] Advantageous embodiments and further developments of the invention emerge 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 expedient manner, thus revealing further embodiments of the invention.

[0008] According to an advantageous embodiment of the invention, the DC / DC voltage converter is also designed to supply the auxiliary loads with electrical energy from the high-voltage battery. The direct supply of the auxiliary loads with electrical energy from the DC / DC voltage converter makes it possible to operate the auxiliary loads of the body with electrical energy from the chassis's high-voltage battery, i.e., independently of the capacity of the low-voltage battery.

[0009] Particularly preferred is an embodiment in which an inverter assigned to the chassis is connected on the input side to the high-voltage battery and on the output side to the chassis drive. The inverter assigned to the chassis serves to supply the chassis drive with alternating voltage, which is converted from the direct voltage of the high-voltage battery in the inverter.

[0010] A particularly advantageous embodiment of the invention relates to an inverter assigned to the structure, which is connected on the input side to the high-voltage battery and on the output side to the drum drive. The inverter assigned to the structure serves 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 a 400VDC / 400VAC converter.

[0011] A particularly advantageous embodiment of the invention provides that the inverter assigned to the body 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. During production of 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 direct voltage provided by the high-voltage battery, for example 400 or 750 V for the low-voltage range, into 24 V direct voltage. The high-voltage connection can be monitored via an HV interlock. In addition, an input signal from a control device of the body can be detected via relays, indicating 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 body of the truck mixer can communicate with each other.

[0012] An advantageous embodiment of the invention provides that one or more auxiliary consumers of the structure from the group

[0013] Headlights, water pumps, actuators for discharge chutes, actuators for swiveling filling hoppers, actuators for drum closure lids, cooling devices for cooling the drum drive, control devices, operating devices, and electrically operated brakes for slowing the rotation of the mixer drum. The headlights of the body can be work lights that illuminate the area around the truck mixer for safe work in the dark. As an auxiliary power source of the body, the headlights can be easily supplied with low-voltage electrical energy from the low-voltage battery or DC / DC converter assigned to the body. This can be done directly via the low-voltage battery or DC / DC converter, or via the body's control device. The headlights preferably have a maximum power consumption in the range of 75-100 watts.

[0014] The body's water pump is used to generate the required water pressure in the body's water system. The body's water system serves, on the one hand, to clean the truck mixer after use and, on the other hand, to improve the flowability of the mixing material in the mixer drum by adding water as needed. The water pump can be easily connected to the low-voltage battery or the DC / DC 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's control unit via a CAN data bus.

[0015] The discharge chute actuator is used to flexibly adjust the discharge chute, ensuring easy access to the hoppers of truck-mounted concrete pumps or concrete silos for filling with mixed material from the mixer drum. For electrical adjustment of the discharge chute, the actuator is powered by electrical energy from the low-voltage battery or DC / DC converter. The discharge chute actuator preferably has a maximum power consumption of 300 watts.

[0016] The actuator for the swivel hopper is used to flexibly adjust the swivel hopper, simplifying the filling of the mixer drum with mixed material. For electrical adjustment of the swivel hopper, the actuator is powered in the low-voltage range by electrical energy from the low-voltage battery or the DC / DC converter. The actuator for the swivel hopper preferably has a maximum power consumption of 300 watts, or two times 300 watts in the case of two closure actuators.

[0017] The drum cover actuator can be used to electrically close the mixer drum cover. To close the mixer drum, the drum cover is moved by the actuator, which is powered by electrical energy from the low-voltage battery or the DC / DC converter. The actuator for the drum cover preferably has a maximum power consumption of 300 watts.

[0018] Another auxiliary load, supplied with low-voltage power from the body's low-voltage battery or the DC / DC converter, is the cooling device, which cools the drum drive and other components. The cooling device preferably has a maximum power consumption of 600 watts.

[0019] Furthermore, the body's control unit can also be operated as an auxiliary consumer with low voltage from the body's low-voltage battery or the DC / DC converter to control the truck mixer's functions. The control unit itself can provide a low-voltage power supply for other auxiliary consumers of the body. The body's low-voltage battery ensures the control of the body's auxiliary consumers via the control unit. Furthermore, the voltage supply from the low-voltage battery provides electrical energy to drive the auxiliary consumers.

[0020] Another auxiliary consumer of the body can be the control unit for operating the truck mixer. This control unit 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 power from the body's low-voltage battery or the DC / DC voltage converter. The control unit preferably has a maximum power consumption of 24 watts per input and output unit. The body's low-voltage battery preferably supplies all auxiliary consumers of the body with a low-voltage voltage of 24 volts. Auxiliary consumers such as the actuators for the discharge chute, the swiveling filling hopper, the drum closure lid, and the cooling device are preferably supplied directly with 24 V from the body's low-voltage battery and controlled by an I / O interface of the control unit via relays on the respective auxiliary consumer.The low-power worklight is preferably supplied with power directly from the control unit and thus controlled. The auxiliary loads can be supplied via the DC / DC voltage converter and the low-voltage battery in parallel or alternatively.

[0021] 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 be reliably stopped via the low-voltage battery of the body even in the event of a failure of the high-voltage battery of the chassis.

[0022] A particularly advantageous embodiment provides that the possible instantaneous electrical input power of an individual auxiliary load or several of the auxiliary loads together exceeds the maximum electrical output power of the DC / DC voltage converter, wherein the low-voltage battery is provided and designed to provide the difference between the possible instantaneous input power of the auxiliary load(s) and the maximum output power of the DC / DC voltage converter over a limited period of time. Thus, the short-term maximum input power of an auxiliary electrical load 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 auxiliary electrical load and the maximum output power of the DC / DC voltage converter available to the auxiliary load.The maximum power consumption of several simultaneously operated auxiliary devices can also exceed the maximum output of the voltage converter. The low-voltage battery can therefore make the difference between the maximum power consumption of the auxiliary devices and the maximum output of the DC / DC voltage converter available to the simultaneously operated auxiliary devices. The auxiliary devices could 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 therefore serves as an energy buffer to provide sufficient energy during peaks in the power consumption of the auxiliary devices and thus prevent 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, the DC / DC converter cannot provide sufficient electrical energy from the high-voltage battery. However, the auxiliary loads continue to be reliably supplied from the low-voltage battery.

[0023] The potential instantaneous electrical input power of a single auxiliary load or several of them together can therefore exceed the maximum electrical output power of the DC / DC voltage converter, which allows the use of a weaker, i.e., smaller, DC / DC voltage converter. This is because the difference between the potential instantaneous input power of the auxiliary load(s) and the maximum output power of the DC / DC voltage converter can be provided by the low-voltage battery for a limited period of time. This allows higher inrush currents of the auxiliary loads to be absorbed in the low-voltage power supply of the vehicle.

[0024] The auxiliary loads are usually only run for short periods, preferably less than 10 minutes, so the DC / DC converter can recharge the low-voltage battery during the breaks. Suitable DC / DC converters deliver an output power of 3 kW to 6.5 kW.

[0025] An advantageous embodiment provides that the low-voltage battery is designed to supply at least one of the body's auxiliary loads with electrical energy even in the event of a failure of the DC / DC voltage converter and / or the high-voltage battery. This allows the auxiliary loads of the body to be operated independently of the chassis' high-voltage battery and the DC / DC voltage converter, providing additional safety for the truck mixer.

[0026] According to a preferred embodiment of the invention, the at least one auxiliary consumer is an electrically actuated brake for decelerating the rotational movement of the mixer drum. The brake is energized by the low-voltage battery to open it and closes automatically if the brake power supply fails or is switched off. The low-voltage battery of the body can thus reliably stop the rotational movement of the mixer drum even if the high-voltage battery of the chassis fails, even if the DC / DC voltage converter no longer supplies low-voltage voltage.

[0027] For example, it can be planned that when the chassis' high-voltage battery reaches a minimum charge level, the power output to the truck mixer body is reduced or interrupted so that the chassis' drive energy is still sufficient to reach a charging station to recharge the high-voltage battery. Even in this situation, the low-voltage battery still supplies sufficient energy for the auxiliary consumers.

[0028] A particularly advantageous embodiment provides that none of the body's auxiliary consumers are supplied with electrical power via a low-voltage power supply assigned to the chassis. The independent supply of the body's auxiliary consumers makes the electrical connection of the body flexible for different chassis. Eliminating the use of the chassis's low-voltage power supply for the body's auxiliary consumers eliminates the need for modifications to the chassis in the area of ​​the low-voltage power supply. Furthermore, the different potentials of a low-voltage power supply for the chassis and that of the body, which could lead to complex problems, are irrelevant.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 provide sufficient energy via the high-voltage connection to operate the drum drive on the body.

[0029] Further features, details, and advantages of the invention will become apparent from the following description and the drawings, which show an exemplary embodiment of the invention. Corresponding objects or elements are provided with the same reference numerals in all figures. They show:

[0030] Figure 1 truck mixer according to the invention,

[0031] Figure 2 Power supply of the truck mixer, and

[0032] Figure 3 Control lines of the truck mixer.

[0033] In Figure 1, designated by reference numeral 1, there is shown an inventive

[0034] Truck mixer shown. Such a truck mixer 1 is used in particular for transporting concrete from the concrete mixing plant to the construction site. The truck mixer 1 shown here is designed as a truck, wherein the truck comprises a supporting chassis 2 and a body 3 which is mounted on the supporting chassis 2 of the truck. However, the truck mixer can also be designed as a semitrailer combination, wherein the semitrailer combination is formed from a tractor comprising the chassis and a semitrailer 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 the moving forward movement of the truck mixer 1. The body 3, on the other hand, has a mixer drum 7 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 drum 7. 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 (Figs. 2 and 3) assigned to the chassis 2, which is connected on the input side to the high-voltage battery 8 and on the output side to the chassis drive 4. The body 3 is also assigned an inverter 12 (Figs. 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 is assigned a low-voltage battery 23 (Fig. 2 and 3), which supplies the secondary components, such as the control 24 (Fig.2 and 3) of the chassis, the radio and the air conditioning system for the driver's cab 25, as well as the headlights 26 and taillights of the chassis 2, etc., are supplied with electrical energy in the low-voltage range, preferably 24V. The truck mixer 1 according to the invention also has a low-voltage battery 9 assigned to the body 3. This low-voltage battery 9 is intended to supply various auxiliary consumers 14, 15, 16, 17, 18, 19, 20, 21, 22 of the body 3 with electrical energy.

[0035] Figure 2 shows a schematic overview of the power supply of the truck mixer 1 according to Figure 1. The components 4, 11, 8, 27 and the auxiliary components 23, 24 of the chassis 2 are combined in a single block. The consumers and auxiliary consumers of the body 3 are also combined in a single block. The chassis 2 and the body 3 are connected to one another via a high-voltage connection 13. A disconnect switch 27 is provided on the chassis 2 at the high-voltage connection 13 to disconnect the connection to the body 3. The body 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 body 3.The truck mixer 1 has a DC / DC voltage converter 10 connected on the input side to the high-voltage battery 8 and on the output side to the low-voltage battery 9 and the auxiliary consumers 14, 15, 16, 17, 18, 19, 20, 21, 22. This DC / DC voltage converter 10 serves to charge the low-voltage battery 9 with electrical energy from the high-voltage battery 8. This makes it possible to create a particularly simply constructed truck mixer 1 with electric drives, since the body 3 does not need to have its own high-voltage battery 8 to electrically supply the drum drive 6. In addition, the supply to the auxiliary consumers 14, 15, 16, 17, 18, 19,.

[0036] 20, 21, 22 is temporarily possible via the low-voltage battery 9 of the body 3, independently of the high-voltage battery 8. Furthermore, a permanent supply of the auxiliary consumers 14, 15, 16, 17, 18, 19, 20, 21, 22 is possible independently of a low-voltage power supply 23 of the chassis 2. Therefore, no modifications to the chassis 2 are necessary 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 body 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 power consumption of a single auxiliary load 14, 15, 16, 17, 18, 19, 20, 21, 22 or several simultaneously operated auxiliary loads 14, 15, 16, 17, 18, 19, 20,

[0037] 21, 22 together provide the maximum electrical output power of the DC / DC voltage converter 10, the low-voltage battery 9 of the structure 3 can provide 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 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 maximum electrical output power that 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 body 3 can supply the auxiliary consumers 14, 15, 16, 17, 18, 19, 20, 21, 22 of the body 3 with electrical energy even if the DC / DC voltage converter 10 fails and / or if the high-voltage battery 8 fails, for example due to a low state of charge.

[0038] An auxiliary consumer can be an electrically actuated brake 22 for braking the rotational movement of the mixer drum 7. The rotational 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 energized 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 be closed too quickly during normal operation so that the entire 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, e.g. when driving uphill, the mixer drum 7 could rock due to the drum contents without a powered drum drive 6.The brake 22 would then at least hold the mixer drum 7 in position, thereby calming the contents of the mixer drum 7.

[0039] Other auxiliary consumers of the body 3 can be headlights 14, a water pump 15, an actuator for the discharge chute 16, an actuator for the swiveling filling funnel 17, or an actuator for the drum closure lid 18. Another auxiliary consumer is the control device 20 of the body 3. The headlight 14, as an auxiliary consumer of the body 3, is simply supplied with electrical energy in the low-voltage range by the low-voltage battery 9 assigned to the body 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 indicated in Figure 3, 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 with 24 V directly from the low-voltage battery 9 and controlled by the control device 20 of the body 3 via a CAN data bus 33 (Fig. 3). Furthermore, a cooling device 19 for cooling the drum drive 6 can be provided as an auxiliary consumer. Another auxiliary consumer of the body 3 can be the operating device 21 for operating the truck mixer 1. This operating device 21 can be formed by input and output units on the rear 30 (Fig. 1 ), driver's cab 25 (Fig. 1 ) or by remote controls. The operating device 21 as an auxiliary consumer can also be supplied by the DC / DC voltage converter 10 or the low-voltage battery 9 of the body 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.

[0040] The control device 20 can itself provide a low-voltage power supply for other auxiliary consumers of the body, as shown in Figure 3. Auxiliary consumers with low power consumption, such as the coolant pump of the cooling device 19 or the work lights 14, are advantageously supplied with power directly by the control device 20 and thus controlled. The auxiliary consumers, such as the actuators for the discharge chute 16, the swivel filler funnel 17, and the drum closure cover 18, are preferably supplied with 24 V via relay 32 from the low-voltage battery 9 of the body 3, and the power supply is controlled from an I / O interface 31 of the control device 20 to the respective auxiliary consumer via relay 32. The relays 32 are part of the safety technology for safely shutting off the auxiliary consumers 16, 17, and 18; these auxiliary consumers are controlled via a CAN data bus connection.

[0041] - List of reference symbols -

[0042] List of reference symbols

[0043] truck mixer

[0044] chassis

[0045] Construction

[0046] Chassis drive

[0047] drive axle

[0048] Drum drive

[0049] Mixer drum

[0050] High-voltage battery

[0051] Low-voltage battery (body) - voltage converter

[0052] First inverter (chassis)

[0053] Second inverter (structure)

[0054] High-voltage connection

[0055] Headlight 15 Water pump

[0056] 16 Actuator of a discharge chute

[0057] 17 Actuator of a filling swivel hopper

[0058] 18 Actuator of a drum closure cover 19 Cooling device

[0059] 20 Control device

[0060] 21 Control device

[0061] 22 Brake

[0062] 23 Low-voltage battery (chassis) 24 Control (chassis)

[0063] 25 Driver's cab

[0064] 26 headlights

[0065] 27 circuit breakers

[0066] 28 Power Distribution Unit (high voltage) 29 Pump motor

[0067] 30 rear

[0068] 31 I / O interface

[0069] 32 relays

[0070] 33 CAN data bus Third inverter (water pump) Power distribution unit (low voltage)

[0071] - Patent claims -

Claims

Patent claims 1. A truck mixer (1) with a chassis (2) and a body (3), wherein the chassis (2) has at least one drive axle (5) driven by a chassis drive (4) for the traveling movement of the truck mixer (1), and wherein the body (3) has 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, wherein a high-voltage battery (8) of the truck mixer (1) is designed to supply both the chassis drive (4) and the drum drive (6) with electrical energy, wherein the truck mixer (1) has a low-voltage battery (9) assigned to the body (3), which is intended to supply auxiliary consumers (14, 15, 16, 17, 18, 19, 20, 21, 22) of the body (3) with electrical energy,wherein the truck mixer (1) has a DC / DC voltage converter (10) connected on the input side to the high-voltage battery (8) and 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).

2. Truck mixer (1) according to claim 1, characterized in that the DC / DC voltage converter (10) is also provided to supply the secondary consumers (14, 15, 16, 17, 18, 19, 20, 21, 22) with electrical energy from the high-voltage battery (8).

3. Truck mixer (1) according to claim 1 or 2, characterized in that an inverter (11) assigned to the chassis (2) is connected on the input side is connected to the high-voltage battery (8) and on the output side to the chassis drive (4).

4. Truck mixer (1) according to one of the preceding claims, characterized in that an inverter (12) assigned to the body (3) is connected on the input side to the high-voltage battery (8) and on the output side to the drum drive (6).

5. Truck mixer (1) according to claim 4, characterized in that the inverter (12) assigned to the body (3) and the DC / DC voltage converter (10) are connected to the high-voltage battery (8) via the same high-voltage connection (13).

6. Truck mixer (1) according to one of the preceding claims, characterized in that one or more auxiliary consumers of the body (3) are selected from the group Headlight (14), water pump (15), actuator of a discharge chute (16), actuator of a filling swivel funnel (17), actuator of a drum closure lid (18), cooling device (19) designed to cool the drum drive (6), control device (20), operating device (21) and electrically actuated brake (22) for braking the rotary movement of the mixer drum (7).

7. Truck mixer (1) according to one of the preceding claims, characterized in that the possible instantaneous electrical input power of an individual 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), wherein the low-voltage battery (9) is provided and designed to compensate the difference between the possible current input power of the auxiliary consumer(s) (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.

8. 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 secondary consumer (14, 15, 16, 17, 18, 19, 20, 21, 22) of the body (3) with electrical energy even in the event of failure of the DC / DC voltage converter (10) and / or the high-voltage battery (8).

9. Truck mixer (1) according to claim 8, characterized in that the at least one auxiliary consumer is the electrically actuated brake (22) for braking the rotary movement of the mixer drum (7). 10 Truck mixer (1) according to one of the preceding claims, characterized in that none of the secondary consumers (14, 15, 16, 17, 18, 19, 20, 21, 22) of the body (3) is connected to the chassis (2) via a Low-voltage power supply is supplied with electrical energy. - Summary -

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