Self-propelled concrete pump

Abstract

The invention relates to a truck-mounted concrete pump (1) with a hydraulically driven concrete pumping device (2), a first hydraulic pump (3), a second hydraulic pump (4), the first and second hydraulic pumps (3, 4) being provided for the joint hydraulic drive of the concrete pumping device (2), and a first drive motor (5) provided for the mechanical drive of the first and second hydraulic pumps (3, 4), which are connected to one another in a drive-force-transmitting manner. The first and second hydraulic pumps (3, 4) are connected in a drive-force-transmitting manner via a coupling (7), which is provided for selectively interrupting the drive-force-transmitting connection between the first hydraulic pump (3) and the second hydraulic pump (4). In a first variant of the invention, the first and second hydraulic pumps (3, 4) form a hydraulic pump train (6), which connects them in a drive-force-transmitting manner.In a second variant, the first and second hydraulic pumps (3, 4) are connected to each other via a transfer case (30) to transmit drive force.

Description

[0001] The invention relates to a truck-mounted concrete pump with a hydraulically driven concrete pumping device, a first hydraulic pump, a second hydraulic pump, wherein the first and the second hydraulic pump are provided for the common hydraulic drive of the concrete pumping device, and a first drive motor, provided for the mechanical drive of the first and the second hydraulic pump, which are connected in a drive force-transmitting manner.

[0002] Today, such a truck-mounted concrete pump is typically still powered by a diesel engine from a truck chassis, with the diesel engine driving a train of hydraulic pumps via an engine-dependent power take-off or via the cardan shaft of the wheel drive and a transfer case. A diesel engine used for this purpose typically has an output of approximately 200 to 400 kW, ensuring sufficient reserve power to drive the truck-mounted concrete pump, which requires a maximum output of 200 to 250 kW at full output. The simultaneous drive of all hydraulic pumps inevitably results in all hydraulic pumps—which, in addition to the concrete pumping device, also drive the articulated boom, the outriggers, the agitator, the concrete changeover valve or the pipe switch, and possibly other components of the superstructure—being driven at an identical, generally constant, speed.This alone results in power losses because the available power of the hydraulic pumps is not constantly drawn, even if adjustable hydraulic pumps can be switched to idle operation by adjusting the delivery rate.

[0003] It is therefore an object of the invention to provide an improved truck-mounted concrete pump which offers an effective way of reducing power losses.

[0004] This task is solved by a truck-mounted concrete pump with the features of claim 1.

[0005] By providing a clutch to selectively interrupt the drive-power transmission connection between the first hydraulic pump and the second hydraulic pump, it is possible to reduce power losses. The clutch allows the drive-power transmission connection to be separated, allowing the concrete pumping device to be driven independently by the first or second hydraulic pump. If the concrete pumping device's output is reduced, it may be sufficient to use only one of the two hydraulic pumps to drive the concrete pumping device.If the drive power transmission connection for one of the two hydraulic pumps is interrupted, the other of the two hydraulic pumps can continue to drive the concrete pumping device hydraulically, mechanically driven by the first drive motor. This can significantly reduce power losses if the set delivery capacity of the concrete pumping device is reduced compared to the maximum delivery capacity. The advantage of the invention is therefore that individual hydraulic pumps of a truck-mounted concrete pump, whose drive power is not required in certain operating situations, can be decoupled from the drive motor in order to avoid unnecessary drive energy being expended for the hydraulic pumps to rotate while idling.

[0006] 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.

[0007] According to a first advantageous variant of the invention, the first and second hydraulic pumps form a first hydraulic pump train, via which they are connected to one another in a drive-force-transmitting manner, with the clutch being assigned to the first hydraulic pump train. The clutch of the first hydraulic pump train can then be used to disconnect the drive-force-transmitting connection to the first drive motor for the other hydraulic pump. This is most easily accomplished via the clutch assigned to the first hydraulic pump train, because with this clutch, the drive-force-transmitting connection between the first hydraulic pump and the second hydraulic pump can be selectively interrupted.

[0008] According to an advantageous embodiment of the invention, the first drive motor is an internal combustion engine. The internal combustion engine can be a diesel engine with an output of 200 to 400 kW. This internal combustion engine preferably also serves as the drive for the chassis of the truck-mounted concrete pump, as this allows for long ranges when moving the truck-mounted concrete pump to construction sites.

[0009] Particularly preferred is an embodiment which provides a second drive motor, also for mechanically driving the first hydraulic pump train, wherein the coupling is arranged in the hydraulic pump train at a position between the first and the second drive motor. Via the second drive motor, the hydraulic pump, which can no longer be driven by the first drive motor due to interruption of the drive force transmitting connection by means of the coupling, can be driven independently of the other hydraulic pump by the second drive motor in order to hydraulically drive the concrete pumping device, for example when the first drive motor is switched off. If the drive force transmitting connection between the first hydraulic pump and the second hydraulic pump is severed, the first hydraulic pump can, for example, be driven by the first drive motor.The second hydraulic pump can then be driven by the second drive motor. This allows the hydraulic pumps to be driven independently of each other by the two drive motors if the drive-power transmission connection is interrupted by the clutch. The first clutch also simultaneously functions, for example, to decouple a power take-off drive shaft on the first drive motor.

[0010] By positioning it between the first and second hydraulic pumps, the first clutch has to transmit less power and can therefore be dimensioned smaller than, for example, a clutch directly on the power take-off of the first drive motor.

[0011] A particularly advantageous embodiment of the invention relates to the first hydraulic pump train comprising at least one third hydraulic pump, wherein the third hydraulic pump is provided to drive actuating elements of an articulated boom of the truck-mounted concrete pump and / or actuating elements of a support of the truck-mounted concrete pump and / or a pipe switch of the truck-mounted concrete pump and / or an agitator of the truck-mounted concrete pump and / or another auxiliary unit of the truck-mounted concrete pump. A plurality of third hydraulic pumps can also be provided in the first hydraulic pump train to drive the actuating elements, the pipe switch, and the agitator. Several of the components of the truck-mounted concrete pump can also be driven jointly or sequentially by a third hydraulic pump.

[0012] A particularly advantageous embodiment of the invention provides that the third hydraulic pump in the first hydraulic pump train is located at a position between the clutch and the second drive motor. At this position, the drive-force-transmitting connection between the first and second hydraulic pumps can be severed, for example, by engaging the clutch, while the third hydraulic pump can continue to be driven by the second drive motor.For example, the first drive motor and the first hydraulic pump in the first hydraulic pump line can be separated from the second and the third hydraulic pump in the first hydraulic pump line, wherein the second and the third hydraulic pump can continue to be driven via the second drive motor, for example to operate the concrete pumping device with a reduced delivery rate or to extend or retract the support of the truck-mounted concrete pump or to unfold or fold the articulated boom of the truck-mounted concrete pump or to operate the pipe switch or the agitator, in particular in each case independently of the first drive motor.

[0013] An advantageous embodiment of the invention provides a further clutch assigned to the first hydraulic pump train, which is designed to selectively interrupt the drive-force-transmitting connection between the third hydraulic pump and the first or second hydraulic pump. With the further clutch in the first hydraulic pump train, the third hydraulic pump can also be driven by the second drive motor independently of the second hydraulic pump. Furthermore, the first hydraulic pump and the second hydraulic pump can also be driven independently of the third hydraulic pump by the first drive motor if the further clutch assigned interrupts the drive-force-transmitting connection between the third hydraulic pump and the first or second hydraulic pump.With the additional coupling in the hydraulic pump line, the second hydraulic pump can also be separated from the hydraulic pump driven by it when the articulated boom is being folded out or in and when the outriggers are being extended or retracted. This enables efficient assembly and disassembly of the truck-mounted concrete pump using purely electric operation. In this case, the first and second hydraulic pumps in the hydraulic pump line can be separated from the third hydraulic pump via the additional coupling assigned to the first hydraulic pump line, meaning that they do not have to be moved. With an additional coupling between the third hydraulic pumps for driving the agitator and the pipe switch, the agitator can be operated, for example, during conveyor breaks with a full feed hopper, without the accumulator charging pump having to be dragged along in idle mode.

[0014] A particularly advantageous embodiment is one in which the second drive motor is an electric motor. The electric second drive motor enables emission-free operation of the truck-mounted concrete pump on the construction site, since the electric motor allows the concrete pumping device to be operated at a reduced output when the first drive motor is switched off. With the disconnection of the drive-force connection between the first hydraulic pump and the second hydraulic pump, only the second hydraulic pump, driven by the electric second drive motor, is available for the hydraulic drive of the concrete pumping device.The third hydraulic pumps in the first hydraulic pump line can then be used to extend or retract the outriggers of the truck-mounted concrete pump, unfold or fold the articulated boom of the truck-mounted concrete pump, or drive the transfer valve or agitator without emitting exhaust gases from the second drive motor. Particularly when driving the hydraulic pumps via an electric motor, the drive power of which is limited, for example, by space restrictions or restrictions on the electrical connection power on a construction site, it is particularly advantageous to disengage unused hydraulic pumps via a clutch. When operating a truck-mounted concrete pump electrically, a drive power of approximately 80-90 kW can be expected with a 125 A construction site power connection. If only a 63 A power connection is available on the construction site, the drive power will be correspondingly lower.For electric operation of the truck-mounted concrete pump, only one of the two hydraulic pumps is required to drive the concrete pumping device, and this can be disengaged from the first drive motor and the other hydraulic pump via the coupling according to the invention for electric operation. The coupling, which is required anyway to disconnect the drive shaft to the combustion engine when operating with the electric motor, is arranged according to the invention between the two hydraulic pumps that drive the differential cylinders of the concrete pumping device. When the truck-mounted concrete pump is operated with a combustion engine, the clutch is engaged, and the combustion engine drives the first and second hydraulic pumps. This enables high-performance concrete delivery, since the combustion engine typically delivers more than 200 kW.In electric mode of the truck-mounted concrete pump, however, the first or second hydraulic pump is decoupled via the first clutch, so that the electric motor, which already has less power than the combustion engine, does not have to drive the decoupled hydraulic pump even when idling. Furthermore, the still-driven hydraulic pump operates over a wide swivel angle range with significantly greater efficiency, ensuring optimal drive of the concrete pumping device. This means that in combustion mode of the truck-mounted concrete pump, for example, all hydraulic pumps can be driven by the first drive motor, which is a combustion engine. In electric mode of the truck-mounted concrete pump, for example, a 190 cm 3 -Hydraulic pump is not rotated by the electric motor and the concrete pumping device is, for example, only driven by a 130 cm 3 -Hydraulic pump. The now better utilized 130 cm 3The hydraulic pump is thus also operated in a higher swivel angle range with very good efficiency, so that the drive energy used by the electric motor is converted particularly effectively into delivery power. Should a little more drive power be available, or it turns out that the unnecessary rotation of the second, other hydraulic pump saves so much drive power that the 190 cm 3 -Hydraulic pump can be used to drive the concrete pumping device, the position of the first and second hydraulic pumps could also be swapped and the 190 cm 3 -Hydraulic pump can be used for the electric drive.

[0015] An advantageous embodiment provides that the electric motor can be driven by the first drive motor via the first hydraulic pump train as a generator. For example, an accumulator of the truck-mounted concrete pump can be charged via the generator, wherein the accumulator is designed to supply the second drive motor with electrical energy when the first drive motor is switched off, so that the concrete pumping device can be operated with reduced delivery rate and the support of the truck-mounted concrete pump can be extended or retracted or the articulated boom of the truck-mounted concrete pump can be unfolded or folded in or the pipe switch or the agitator can be operated when the combustion engine is switched off and the drive force-transmitting connection between the first hydraulic pump and the second hydraulic pump is separated by the first clutch.

[0016] According to a preferred embodiment of the invention, at least one second hydraulic pump train is provided, which comprises at least one further hydraulic pump, wherein the further hydraulic pump is provided to drive actuating elements of an articulated boom of the truck-mounted concrete pump and / or actuating elements of a support of the truck-mounted concrete pump and / or a pipe switch of the truck-mounted concrete pump and / or an agitator of the truck-mounted concrete pump and / or another auxiliary unit of the truck-mounted concrete pump, wherein a further electric motor is provided for the mechanical drive of the further hydraulic pump train. The division of the hydraulic pumps of the truck-mounted concrete pump into several hydraulic pump trains has the advantage that the further hydraulic pump train can be driven only with electrical energy. This allows the second hydraulic pump train to be operated independently of the first hydraulic pump train, which, for example,enables the first drive motor to be switched off, thus enabling efficient, emission-free operation of the truck-mounted concrete pump when extending or retracting the outriggers or when folding or unfolding the articulated boom of the truck-mounted concrete pump or when driving the pipe switch or the agitator. The first hydraulic pump line preferably comprises the first and second hydraulic pumps and a third hydraulic pump for driving the actuating elements of the outriggers and articulated boom. This first hydraulic pump line is advantageously driven alternately by an internal combustion engine and an electric motor. Furthermore, the further hydraulic pumps in the second hydraulic pump line can then drive the agitator and the pipe switch. The second hydraulic pump line is then preferably driven by the further electric motor.Because the second hydraulic pump train is only electrically operated, this variant can also be used in combustion engine operation and would also have a certain savings effect with a truck-mounted concrete pump powered solely by a combustion engine, since the speed of the additional electric motor can be optimally adjusted to the hydraulic pumps of the second hydraulic pump train.

[0017] A particularly advantageous embodiment provides that the electric motor, driven by the first drive motor as a generator via the first hydraulic pump train, supplies the additional electric motor with power. This allows the second hydraulic pump train, which is driven solely by electrical energy, to also be supported by the first drive motor. This is possible, for example, if an accumulator in the truck-mounted concrete pump no longer supplies sufficient electrical energy for the second hydraulic pump train. In combustion mode of the truck-mounted concrete pump, the second drive motor, driven by the first drive motor, operates in generator mode and generates power to drive the additional electric motor, which drives the second hydraulic pump train.

[0018] A particularly advantageous embodiment of the invention provides that at least one of the clutches is designed as a freewheel or a switchable clutch. With the freewheel as a clutch, the drive-force-transmitting connection can be easily interrupted for the other direction of rotation by transmitting torque only in one direction of rotation. With a switchable clutch, on the other hand, the drive-force-transmitting connection can be interrupted regardless of the direction of rotation.

[0019] According to a second advantageous variant of the invention, the first drive motor is connected to a first transmission input of a transfer case in a drive-transmitting manner, with the first hydraulic pump being connected to a first transmission output of the transfer case, and the second hydraulic pump being connected to a second transmission output of the transfer case in a drive-transmitting manner. Because the first hydraulic pump and the second hydraulic pump are connected to different transmission inputs of a transfer case in a drive-transmitting manner, the drive-transmitting connection of the hydraulic pumps can be very easily interrupted by means of the clutch.

[0020] Advantageously, the clutch is associated with the transfer case. By associating the clutch with the transfer case, the clutch can be very easily positioned between the first and second hydraulic pumps to selectively interrupt the connection. The clutch can advantageously be integrated into the transfer case, resulting in a simple and compact drive for the concrete pump with a transfer case.

[0021] Alternatively, the clutch can be located outside the transfer case between the second hydraulic pump and the second transmission output. This has the advantage, for example, that the size or dimensioning of the clutch can be easily adapted to the output of the second hydraulic pump without having to make any modifications to the transmission.

[0022] According to an advantageous embodiment, the second variant of the invention provides that the first drive motor is an internal combustion engine, which results in the same advantages as the first variant of the invention.

[0023] Advantageously, a second drive motor is arranged at a second transmission input of the transfer case, wherein the second drive motor is also provided for the mechanical drive of the transfer case, to which the first hydraulic pump and the second hydraulic pump are connected in a drive-force-transmitting manner, wherein the clutch is designed to selectively interrupt the drive-force-transmitting connection between the second hydraulic pump and the second drive motor. This arrangement makes it very easy to interrupt the power transmission between the second drive motor and the second hydraulic pump. The second drive motor then only drives the first hydraulic pump to drive the concrete device, resulting in the same advantages as described above in connection with the first variant of the invention.

[0024] Advantageously, the second drive motor is an electric motor. As already described above in connection with the first variant, the electric motor has a lower power output than the combustion engine of the truck-mounted concrete pump for various reasons. The advantages resulting from the use of an electric motor in the second variant of the invention are essentially the same as in the first variant of the invention presented above.

[0025] Advantageously, in the second variant of the invention, the electric motor can also be driven as a generator by the first drive motor via the transfer case. Here, too, the advantages correspond to those stated above in connection with the first variant of the invention.

[0026] In an advantageous embodiment of the second variant of the invention, the transfer case is connected to at least one third hydraulic pump via a third transmission output in a drive-force-transmitting manner, wherein the at least one third hydraulic pump is provided to drive actuating elements of an articulated boom of the truck-mounted concrete pump and / or actuating elements of a support of the truck-mounted concrete pump and / or a pipe switch of the truck-mounted concrete pump and / or an agitator of the truck-mounted concrete pump and / or another auxiliary unit of the truck-mounted concrete pump. By arranging at least one third hydraulic pump on the transfer case, in addition to the first and second hydraulic pumps for driving the concrete pumping device, further auxiliary working units of the truck-mounted concrete pump can be driven very easily by the first and / or second drive motor via the transfer case.

[0027] The transfer case can be assigned a further clutch, which is designed to selectively interrupt the drive-power transmission connection between the transfer case and the at least one third hydraulic pump. This allows the transmission of drive power to the at least one third hydraulic pump to be easily interrupted, allowing the concrete pumping device to be driven selectively by the first and / or the second hydraulic pump alone, thus avoiding power losses due to the drive of unnecessary auxiliary units.

[0028] In a further advantageous embodiment, the first hydraulic pump and the second hydraulic pump are designed for different (maximum) delivery volumes. The two hydraulic pumps are expediently designed as adjustable pumps, i.e., hydraulic pumps with an adjustable delivery volume, in order to be able to adapt the delivery volume to the performance requirements of the driven components. By appropriately designing the different (maximum) delivery volumes of the two hydraulic pumps, it can be ensured that, on the one hand, the hydraulic pump driven by the electric motor operates with high efficiency in electric mode at the maximum achievable electrical drive power, and, on the other hand, the desired maximum power can be achieved in combustion engine mode.

[0029] Further features, details, and advantages of the invention will become apparent from the following description and from the drawings, which show exemplary embodiments of the invention. Corresponding objects or elements are provided with the same reference numerals in all figures. They show: Fig. 1 truck-mounted concrete pump according to the invention, Fig. 2 View of a drive system of the first variant of the truck-mounted concrete pump, Fig. 3a further view of a drive system of the first variant of the truck-mounted concrete pump, Fig. 3b further view of a drive system of the first variant of the truck-mounted concrete pump, Fig. 4 further view of a drive system of the first variant of the truck-mounted concrete pump, and Fig. 5 further view of a drive system of the first variant of the truck-mounted concrete pump, Fig. 6 truck-mounted concrete pump according to the second variant of the invention in a first embodiment, Fig. 6 truck-mounted concrete pump according to the second variant of the invention in a second embodiment, Fig. 7 View of a drive system of the second variant of the truck-mounted concrete pump, Fig. 8 further view of a drive system of the second variant of the truck-mounted concrete pump, Fig. 9 further view of a drive system of the second variant of the truck-mounted concrete pump, Fig. 10 further view of a drive system of the second variant of the truck-mounted concrete pump, Fig. 11 further view of a drive system of the first variant of the truck-mounted concrete pump, Fig. 12 further view of a drive system of the second variant of the truck-mounted concrete pump, Fig. 13 further view of a drive system of the first variant of the truck-mounted concrete pump, Fig. 14 further view of a drive system of the second variant of the truck-mounted concrete pump, Fig. 15 View of a transfer case of the second variant of the truck-mounted concrete pump,

[0030] In the Fig. 1, designated by reference numeral 1, shows a truck-mounted concrete pump according to the invention. The truck-mounted concrete pump 1 has a hydraulically driven concrete pumping device 2 ( Fig. 2 to 4) for pumping liquid concrete. Furthermore, the truck-mounted concrete pump 1 has a first and a second hydraulic pump 2, 3 ( Fig. 2 to 4), wherein the first and second hydraulic pumps 2, 3 ( Fig. 2 to 4) for the common hydraulic drive of the concrete pumping device 2 ( Fig. 2 to 4). The truck-mounted concrete pump 1 has a first drive motor 5 ( Fig. 2 to 4), provided for the mechanical drive of a first hydraulic pump train 6 ( Fig. 2 to 4), through which the first and second hydraulic pumps 2, 3 ( Fig. 2 to 4) are connected to each other to transmit the drive force. The truck-mounted concrete pump 1 essentially comprises a concrete pump substructure with a support 14 with hydraulically driven adjusting elements 12 ( Fig. 2 to 4) and foldable or extendable support beams to increase the footprint on the construction site. Fig. 1, designated by reference numeral 13, is an articulated boom of the truck-mounted concrete pump 1. The articulated boom 13 is mounted on a turntable 22 which is rotatable about a vertical axis and which mounts the articulated boom 13 relative to the chassis 23 of the truck-mounted concrete pump 1 in a rotatable and pivotable manner via an articulated joint 24. The articulated boom 13 has several boom segments 25 which are pivotable in articulated joints about articulated axes relative to an adjacent boom segment 25 or the turntable 22. To pivot the boom segments 25, the articulated joints 24 are each assigned adjusting elements 12 in the form of hydraulic cylinders which effect the pivoting movement of the boom segments 25 in the articulated axes. Via this pivoting movement, the Fig. 1 folded articulated mast 13 can be unfolded. In the unfolded state of the articulated mast 13, liquid concrete can be fed via the feed hopper 26 by means of the concrete pumping device 2 ( Fig. 2 to 4) in the truck-mounted concrete pump 1 through the concrete delivery lines arranged on the articulated boom 13 within the reach of the articulated boom 13 to the place of use on the construction site.

[0031] The Fig. 2 shows a schematic view of an embodiment of the drive system in a first variant of the truck-mounted concrete pump 1 according to the invention ( Fig. 1). As can be seen in the schematic diagram, the truck-mounted concrete pump 1 ( Fig. 1) via a hydraulically driven concrete pumping device 2, typically in the form of a two-cylinder piston pump, as is generally known and customary in the art. For this purpose, a first hydraulic pump 3 and a second hydraulic pump 4 are provided, wherein the first hydraulic pump 3 and the second hydraulic pump 4 are configured for the joint hydraulic drive of the concrete pumping device 2. The truck-mounted concrete pump 1 ( Fig. 1) has a first drive motor 5 for mechanically driving a hydraulic pump train 6, through which the first and second hydraulic pumps 3, 4 are connected to each other in a drive-force-transmitting manner. The first drive motor 5 is preferably designed as an internal combustion engine and advantageously also serves as the drive for the chassis 23 ( Fig. 1) of the truck-mounted concrete pump 1, as this allows for long ranges when moving the truck-mounted concrete pump 1 to the construction sites. Fig. 2 also shows a second drive motor 8 arranged opposite the first drive motor 5 with respect to the hydraulic pump train 6, which second drive motor 8 mechanically drives the hydraulic pump train 6. This second drive motor 8 is preferably designed as an electric motor. The hydraulic pump train 6 shown has a third hydraulic pump 9, which controls the actuating elements 12 ( Fig. 1) of the articulated mast 13 ( Fig. 1) of the truck-mounted concrete pump 1 and / or the adjusting elements 12 of a support 14 ( Fig. 1) of the truck-mounted concrete pump 1. In addition, a further, third hydraulic pump 10 is provided in the hydraulic pump line 6, which drives the pipe switch 15 of the truck-mounted concrete pump 1 ( Fig. 1). Furthermore, the hydraulic pump train 6 comprises a further, third hydraulic pump 11, which drives the agitator 16 of the truck-mounted concrete pump 1 ( Fig. 1) in the feed hopper 26 ( Fig. 1). The distribution of the hydraulic pumps 9, 10, 11 can also be selected differently and other auxiliary units of the truck-mounted concrete pump 1 can also be driven, in particular by further hydraulic pumps in the hydraulic pump line 6. The truck-mounted concrete pump 1 ( Fig. 1) is characterized by a clutch 7 assigned to the hydraulic pump train 6. This clutch 7 is provided to selectively interrupt the drive force transmitting connection between the first hydraulic pump 3 and the second hydraulic pump 4. The clutch 7 is, for example, a switchable clutch that is automatically controlled by the (not shown) control of the hydraulic pump train 6 depending on the operating state. This makes it possible to reduce power losses. By interrupting the drive force transmitting connection by the clutch 7, the first hydraulic pump 3 can be driven by the first drive motor 5 independently of the second hydraulic pump 4. If the delivery capacity of the concrete pumping device 2 is reduced, it may be sufficient to use only the first hydraulic pump 3 to drive the concrete pumping device 2. The second hydraulic pump 4 can then be stationary and does not have to be driven.The advantage is that hydraulic pumps of a hydraulic pump train 6 of a truck-mounted concrete pump 1 (. Fig. 1), whose drive power is not required in certain operating situations, can be decoupled from the drive motor 5 in order to avoid unnecessary drive energy being used for the hydraulic pumps 4, 9, 10, 11 to rotate when idling. The clutch 7 is advantageously arranged in the hydraulic pump train 6 at a position between the first drive motor 5 and the second drive motor 8. Thus, the second hydraulic pump 4, which is no longer driven by the first drive motor 5 due to the interruption of the drive force-transmitting connection by means of the clutch 7, can be driven by the second drive motor 8 independently of the first hydraulic pump 3 in order to continue hydraulically driving the concrete pumping device 2. In this case, for example, the first drive motor 5 can also be switched off.If the second drive motor 8 is designed as an electric motor, emission-free electric operation of the truck-mounted concrete pump 1 (. Fig. 1). This is because the clutch 7 advantageously also has the function of decoupling from a power take-off drive shaft on the first drive motor 5. Thanks to the positioning of the clutch 7 between the first hydraulic pump 3 and the second hydraulic pump 4, the clutch 7 has to transmit less power and can therefore be dimensioned smaller than, for example, a clutch directly on the power take-off 27 of the first drive motor 5. The electric second drive motor 8 enables emission-free operation of the truck-mounted concrete pump 1 ( Fig. 1) is possible on the construction site, since the concrete pumping device 2 can continue to be operated with reduced delivery capacity via the electric motor 8. The interruption of the drive force-transmitting connection between the first hydraulic pump 3 and the second hydraulic pump 4 results in only the second hydraulic pump 4, which is driven by the preferably electric drive motor 8, being available for the hydraulic drive of the concrete pumping device 2. At least one third hydraulic pump is provided in the hydraulic pump train 6. However, several third hydraulic pumps 9, 10, 11 can also be provided. The third hydraulic pumps 9, 10, 11 in the hydraulic pump train 6 can then also be used to support the support 14 ( Fig. 1) the truck-mounted concrete pump is extended or retracted or the articulated boom ( Fig. 1) of the truck-mounted concrete pump can be unfolded or folded in, or the pipe switch 15 or the agitator 16 can be driven by the second drive motor 8 without the emission of exhaust gases. The third hydraulic pumps 9, 10, 11 are advantageously located in the first hydraulic pump train 6 at a position between the coupling 7 and the second drive motor 8. When driving the hydraulic pumps 4, 9, 10, 11 via an electric motor 8, whose drive power is generally lower than that of the combustion engine 5, the decoupling of the unused hydraulic pump 3 offers a great advantage, since it does not have to run idle. If, for example, 125 A or only 63 A are available at a construction site power connection 28, the usable electrical drive power of the truck-mounted concrete pump 1 ( Fig. 1). For the electrical operation of the truck-mounted concrete pump 1 ( Fig. 1), only the second hydraulic pump 4 is advantageously used to drive the concrete pumping device 2. In this case, the first hydraulic pump 3 can be decoupled together with the first drive motor 5 via the clutch 7 for electric operation. In combustion operation of the truck-mounted concrete pump 1 ( Fig. 1), however, the clutch 7 is engaged and the combustion engine 5 drives both the first hydraulic pump 3 and the second hydraulic pump 4. High-performance concrete delivery is then still possible, since the combustion engine 5 typically delivers more than 200 kW of drive power. This allows, for example, all hydraulic pumps to be driven by the first drive motor 5, which is designed as a combustion engine. In electric operation of the truck-mounted concrete pump 1, however, a 190 cm 3-Hydraulic pump as the first hydraulic pump 3 is not rotated by the electric motor 8 and the concrete pumping device 2 is, for example, only driven by a 130 cm 3 -hydraulic pump is driven as a second hydraulic pump 4. The second hydraulic pump 4, which is thus better utilized, is operated in a higher swivel angle range with a very good degree of efficiency, so that the drive energy used by the electric motor 8 is converted particularly effectively into delivery power. If somewhat more drive power is available, or it should turn out that the unnecessary rotation of the first hydraulic pump 3 saves so much drive power that even a 190 cm 3 -Hydraulic pump for the electro-based drive of the concrete pumping device 2 can be used sensibly, a 190 cm 3 -Hydraulic pump can be used as a second hydraulic pump 4. In this case, a 130 cm 3-hydraulic pump can be used as the first hydraulic pump 3. This illustrates that it can be useful to design the two hydraulic pumps differently in terms of their delivery volume in order to achieve the most efficient operation possible without having to accept limitations in the possible maximum performance. An important aspect is that only one of the two hydraulic pumps 3, 4 is used to drive the concrete pumping device 2 in the electric mode of the truck-mounted concrete pump 1 ( Fig. 1). The drive force transmission connection to the first drive motor 5 can then be separated for the other hydraulic pump via the coupling 7 of the hydraulic pump train 6. This is most easily accomplished via the coupling 7 assigned to the hydraulic pump train 6, because with this coupling 7, the drive force transmission connection between the first hydraulic pump 3 and the second hydraulic pump 4 can be very easily closed for combustion operation or interrupted for electric operation.

[0032] In Fig. 3a is a schematic view of a further embodiment of the drive system in the first variant of the truck-mounted concrete pump 1 according to the invention ( Fig. 1). The only difference to the execution according to Fig. 2 is that the second drive motor 8 is not arranged at the end of the hydraulic pump train 6, but between the coupling 7 and the second hydraulic pump 4. The second drive motor 8 is therefore arranged between the first hydraulic pump 3 and the second hydraulic pump 4. The second drive motor 8 can also be arranged at a different position between the coupling 7 and one of the hydraulic pumps 4, 9, 10, 11. In the Fig. 2 and Fig. 3, the electric motor 8 can be driven by the first drive motor 5 via the hydraulic pump train 6 as a generator. For example, an accumulator (not shown here) of the truck-mounted concrete pump 1 ( Fig. 1). This accumulator can be used to supply the second drive motor 8 with electrical energy when the first drive motor 5 is switched off, so that the concrete pumping device 2 can be operated with reduced output and the support 14 ( Fig. 1) the truck-mounted concrete pump 1 ( Fig. 1) can be extended or retracted or the articulated mast 13 ( Fig. 1) the truck-mounted concrete pump 1 ( Fig. 1) can be unfolded or folded in or the pipe switch 15 or the agitator 16 can be operated when the combustion engine 8 is switched off and the drive force transmitting connection between the first hydraulic pump 3 and the second hydraulic pump 4 is separated by the clutch 7. In the Fig. 2 and Fig. 3, at least one further coupling (not shown here) associated with the hydraulic pump train 6 can also be provided, which is designed to selectively interrupt the drive force transmitting connection between a third hydraulic pump 9, 10, 11 and the second hydraulic pump 4. With such a further coupling in the hydraulic pump train 6, for the embodiment according to Fig. 2 at least one third hydraulic pump 9, 10, 11 can also be driven independently of the second hydraulic pump 4 by the second drive motor 8. For the embodiment according to Fig. 3, the second hydraulic pump 4 can be operated independently of the third hydraulic pumps 9, 10, 11.

[0033] In the Fig. 3b is a variant of the execution of the Fig. 3a, in which the electric motor 8 is not directly integrated into the hydraulic pump train 6, but is connected to the hydraulic pump train 6 via a suitable mechanical connection 35, for example a bevel gear connection, toothed belt, chain or similar, from the outside in a way that transmits the drive force. This has the advantage that the electric motor 8 can be arranged at a different position on the truck-mounted concrete pump 1, and on the other hand, this arrangement makes the hydraulic pump train 6 shorter and can therefore also be installed in smaller truck-mounted concrete pumps 1. Otherwise, the Fig. 3b shown variant of the design according to Fig. 3a.

[0034] The Fig. 4 shows a schematic view of a further embodiment of the drive system in the first variant of the truck-mounted concrete pump 1 according to the invention ( Fig. 1). A difference to the statements according to the Fig. 2 and Fig. 3 is that, in addition to the first hydraulic pump line 6, a second hydraulic pump line 18 is provided. Here, in the first hydraulic pump line 6, the first hydraulic pump 3, the second hydraulic pump 4 and a third hydraulic pump 9 for driving the actuating elements 12 of the articulated boom 13 ( Fig. 1) and support 14 ( Fig. 1) from the first drive motor 5 or the second drive motor 8, as in the embodiments according to the Fig. 2 and Fig. 3. The second hydraulic pump train 18 comprises in the embodiment according to Fig. 4, however, the two further hydraulic pumps 10, 11, which are intended to pump the pipe switch 15 of the truck-mounted concrete pump 1 ( Fig. 1) and the agitator 16 of the truck-mounted concrete pump 1 ( Fig. 1). In the embodiment shown, a further electric motor 19 is provided for the mechanical drive of the further hydraulic pump train 18. The electric motor 8, driven by the first drive motor 5 via the first hydraulic pump train 6 as a generator, can supply the further electric motor 19 with power via an electrical line. Thus, the second hydraulic pump train 18, which is driven only by electrical energy, can still be supported by the first drive motor 5. For example, it is also possible to connect an accumulator 21 of the truck-mounted concrete pump 1 ( Fig. 1) via the generator, provided that no construction site power connection 28 is available. The accumulator 21 can be used to supply the second drive motor 8 and the further electric motor 19 with electrical energy when the first drive motor 5 is switched off, so that the concrete pumping device 2 can be operated with reduced output and the support 14 ( Fig. 1) the truck-mounted concrete pump 1 ( Fig. 1) can be extended or retracted or the articulated mast 13 ( Fig. 1) the truck-mounted concrete pump 1 ( Fig. 1) can be unfolded or folded in or the pipe switch 15 or the agitator 16 can be operated. In combustion operation of the truck-mounted concrete pump 1 ( Fig. 1), the second drive motor 8, driven by the first drive motor 5, operates in a generator mode and generates electricity to drive the further electric motor 19, via which the second hydraulic pump train 18 is driven. As in Fig. 4, the first hydraulic pump train 6 and the second hydraulic pump train 18 have separate hydraulic tanks 29. This makes the structural arrangement of the hydraulic pump trains 6, 18 on the truck-mounted concrete pump 1 ( Fig. 1) more flexible and shortens the required hydraulic lines.

[0035] In Fig. 5 is a schematic view of a further embodiment of the drive system in the first variant of the truck-mounted concrete pump 1 according to the invention ( Fig. 1). This version differs from the version according to Fig. 4 merely in that a further clutch 17 is provided in the first hydraulic pump line 6 between the second hydraulic pump 4 and the third hydraulic pump 9. The further clutch 17 is designed to selectively interrupt the drive force transmitting connection between a third hydraulic pump 9 and the second hydraulic pump 4 in the first hydraulic pump line 6. With such a further clutch 17 in the first hydraulic pump line 6, at least a third hydraulic pump 9 can also be driven independently of the second hydraulic pump 4 by the second drive motor 8. In addition, a further clutch 20 is provided between the further hydraulic pumps 10 and 11 in the second hydraulic pump line 18. Via this clutch 20, the further hydraulic pump 11 can drive the agitator 16 without the further hydraulic pump 10 running at idle when the pipe switch 15 is not actuated.

[0036] In Fig. Figure 6 shows a first embodiment of a truck-mounted concrete pump 1 according to the second variant of the invention. In this second variant, a transfer case 30 is arranged between the longitudinal members of the truck chassis or the body of the truck-mounted concrete pump 1. The first drive motor 5, i.e., the internal combustion engine of the truck chassis for the drive, is connected via a first partial cardan shaft 33a to a first transmission input a (see Fig. 8) of the transfer case 30. Another partial cardan shaft 33b leads from the transmission output z to the drive axle of the truck chassis ( Fig. 8). Thus, the first drive motor 5 can, on the one hand, drive the wheels by simply passing the drive force through the transfer case 30; on the other hand, the first drive motor 5 can, in stationary operation, drive the transfer case 30 and thus the hydraulic pumps (3, 4, 9, 10, 11) coupled to its transmission outputs w, x, y for driving the truck-mounted concrete pump 1.

[0037] In the Fig. 7 shows a second embodiment of the second variant of the truck-mounted concrete pump according to the invention, in which the transmission input x of the distribution gearbox 30 is not, as in the Fig. 8, is not connected to the cardan shaft 33 of the wheel drive, but via a cardan shaft to the power take-off (PTO) 27 of the internal combustion engine 5. This second embodiment is usually selected when a sufficiently powerful power take-off is available for the truck, because then no further interventions in the drive train of the truck, ie disconnecting the cardan shaft to the rear wheels, are necessary.

[0038] In the Fig. Figure 8 shows a view of a drive system of the second variant of the truck-mounted concrete pump 1. The first drive motor 5, which is also provided as an internal combustion engine for the travel drive of the truck-mounted concrete pump 1, is connected to a first transmission input a of a transfer case 30 in a drive-force-transmitting manner and is provided for the mechanical drive of the first hydraulic pump 3 and the second hydraulic pump 4, wherein the first hydraulic pump 3 is connected to a first transmission output w of the transfer case 30 and the second hydraulic pump 4 is connected to a second transmission output x of the transfer case 30 in a drive-force-transmitting manner, wherein the first hydraulic pump 3 and the second hydraulic pump 4 are connected to one another via the transfer case 30 in a drive-force-transmitting manner. The first hydraulic pump 3 and the second hydraulic pump 4 are provided for the joint hydraulic drive of the concrete pumping device 2, which in the Fig. 8 is not shown for reasons of clarity. A power transmission arrangement 31, for example consisting of suitably arranged, optionally switchable, gears, chains, belts or the like, serves to transmit the drive force between the transmission inputs a, b and the transmission outputs w, x, y, z. The first and second hydraulic pumps 3, 4 are connected to one another via the power transmission arrangement 31 in a drive force-transmitting manner as long as the clutch 7 is closed. A clutch 7 is provided on the transfer case 30 at the second transmission output x in order to selectively interrupt the drive force-transmitting connection between the first hydraulic pump 3 and the second hydraulic pump 4. The clutch 7 is assigned to the transfer case 30 and can, as shown in the Fig. 8, outside the transfer case 30 between the second hydraulic pump 4 and the second transmission output x, but the clutch 7 could also be integrated into the transfer case 30. In the Fig. 8 drives, analogous to the Fig. 6, the internal combustion engine 5 also drives the wheel drive of the truck-mounted concrete pump 1. For this purpose, a first partial cardan shaft 33a leads from the internal combustion engine 5, or from the drive transmission, to the transmission input a, and a further partial cardan shaft 33b leads from the transmission output z to the rear wheels of the truck chassis of the truck-mounted concrete pump 1. Using the clutches 32a and 32b or other suitable switching devices, the power flow from the internal combustion engine 5 can be directed either to the transmission outputs w, x, y for driving the concrete pump body or to the transmission output z for the drive. A second drive motor 8 is arranged at a second transmission input b of the transfer case 30, which is also intended for the mechanical drive of the transfer case 30, to which the first hydraulic pump 3 and the second hydraulic pump 4 are connected in a drive-force-transmitting manner, the clutch 7 being arranged between the second hydraulic pump 4 and the second drive motor 5.

[0039] The second drive motor 8 is, for example, an electric motor 8, which usually has a lower drive power than the combustion engine 5. This arrangement allows the combustion engine 5, which has a comparatively high drive power compared to the electric motor 8, to drive the concrete pumping device 2 via the first hydraulic pump 3 and the second hydraulic pump 4 with a correspondingly high power when the clutch 7 is closed. When operated with the electric motor 8, the clutch 7 is opened and only the first hydraulic pump 3 is driven by the electric motor 8. This has the advantage that the hydraulic pump 4, which is not required to drive the concrete pumping device 2 anyway due to the lower drive power of the electric motor 8, no longer has to be "dragged along" when idling.The first hydraulic pump 3, which is usually designed as an axial piston pump, can, however, be operated with a large swivel angle, which is particularly advantageous because operating an axial piston pump with small swivel angles results in high hydraulic losses. This allows the already lower drive power of the electric motor 8 to be optimally used to drive the concrete pumping device 2. For example, the hydraulic pump 9 for driving the articulated boom 13 and the support 14, the hydraulic pump 10 for the pipe switch 15, the hydraulic pump 11 for the agitator 16, and possibly other hydraulic pumps are connected to a gearbox output y. These hydraulic pumps are shown here as a combined hydraulic pump train, but could also be driven in any other configuration via the transfer case 30.For example, one of the transmission outputs w or y could be dispensed with and the hydraulic pumps 3, 9, 10, 11 could be combined to form a hydraulic pump train or connected to the transfer case 30 in any other way. The electric motor 4 can, for example, also be driven as a generator by the first drive motor 5 via the transfer case 30. This would make it possible, for example, to drive one or more of the hydraulic pumps 9, 10, 11 completely separately from the transfer case 30 with one or more additional electric motors (not shown) or to charge an accumulator (not shown) during operation of the combustion engine 5, so that in addition to a construction site power supply, electrical drive energy is available for electric operation, which can be used, for example, to absorb power peaks that could overload the external power grid.

[0040] The arrangement of the clutch 7 with the second hydraulic pump 4 and the first hydraulic pump 3 on the transmission outputs w and x of the transfer case 30 can also be reversed as in Fig. 8. Thus, when the clutch 7 on the transmission output w is disengaged, the electric motor 8 drives only the first hydraulic pump 3 located on the transmission output x directly through the transfer case 30, practically bypassing the power transmission arrangement 31. This reduces losses in the electric drive of the concrete pumping device 2 because the electric motor 8 is connected virtually directly to the drive shaft of the hydraulic pump 3.

[0041] The Fig. 9 shows another view of a drive system of the second variant of the truck-mounted concrete pump 1. The only difference to the drive system of the Fig. 8 is that it is not the cardan shaft 33a of the drive that is connected to the transmission input a of the transfer case 30, but the auxiliary drive 27 of the combustion engine 5 via its cardan shaft 34, as also in the Fig. 7. The cardan shaft 34 of the power take-off 27 is decoupled from the transfer case 30 via the clutch 32 when driving the transfer case 30, provided that the power take-off 27 may not be rotated when the combustion engine is switched off, which is usually the case.

[0042] The Fig. 10 shows a further view of a drive system of the second variant of the truck-mounted concrete pump 1. In this variant, the third hydraulic pump 9, which is intended to drive the articulated boom 13 and the outrigger 14, is connected to the transfer case 30 via the gearbox output y and a further clutch 36. The hydraulic pumps 3, 10, 11 are combined to form a hydraulic pump train and arranged at the gearbox output w. With this arrangement, it is possible, particularly in electric operation, to drive only the hydraulic pumps 3, 10, 11 that are necessary for the concrete pumping process without having to accept power losses due to the operation of the hydraulic pump 9. This is particularly advantageous when the truck-mounted concrete pump 1 is operated without the articulated boom 13. For this purpose, the concrete delivery line is led directly to the construction site via a hose or pipe connection, for example, instead of to the articulated boom 13.This also reduces the pumping losses caused by conveying the concrete along the articulated boom 13 via numerous pipe deflections. Of course, it would also be possible to drive the hydraulic pumps 3, 4, 10, and 11 alone when operating with the combustion engine 5, and to decouple only the hydraulic pump 9 for the articulated boom 13.

[0043] The Fig. 11 shows how the Fig. 8, 9 and 10, a drive system with a transfer case 30. The first hydraulic pump 3 and the second hydraulic pump 4 here form a hydraulic pump train 6 in the sense of the first variant of the invention, which is connected to the transmission output x of the transfer case 30. A clutch 7 is arranged between the first hydraulic pump 3 and the second hydraulic pump 4, with which the drive force-transmitting connection between the hydraulic pumps 3, 4 can be selectively interrupted. Thus, when the clutch 7 is engaged, the combustion engine 5 can drive the first hydraulic pump 3 and the second hydraulic pump 4, which jointly drive the concrete pumping device 2, via the transfer case 30. For drive with the electric motor 8, the clutch 7 is opened so that the electric motor 8 only drives the first hydraulic pump 3, thus avoiding losses due to the central rotation of the second hydraulic pump 4 when idling.The third hydraulic pump 9 is arranged at the transmission output w and the third hydraulic pumps 10, 11 are arranged as a second hydraulic pump line at the transmission output y.

[0044] The arrangement of the hydraulic pumps 3, 4, 9, 10, 11 and the clutch 7 at the outputs w, x, y of the transfer case 30 is highly variable. For example, the third hydraulic pumps 9, 10, 11 can be partially or completely integrated into the first hydraulic pump train 6, so that the transmission outputs w, y are not required or are simply left open. However, a symmetrical or even distribution of the hydraulic pumps 3, 4, 8, 9, 10 has proven practical, for example, taking into account the drive power and the size of the hydraulic pumps on the transfer case 30.

[0045] The Fig. Figure 12 shows a drive system for a truck-mounted concrete pump 1 with a differently constructed transfer case 30, which is driven by the combustion engine 5 via the power take-off 27 and the cardan shaft 34 at the transmission input a. The transfer case 30 of the Fig. 12 has two transmission inputs a and b and two transmission outputs x and y. The electric motor 8 is arranged at the transmission input b, which is arranged on the same side of the transfer case 30 as the transmission input a. The first hydraulic pump 3 and the hydraulic pumps 9, 10, 11, which are connected to form a hydraulic pump train, are arranged at the transmission output x, which is arranged opposite the transmission input b with the electric motor 8. The second hydraulic pump 4 is arranged at a transmission output y opposite the transmission input a. The drive force-transmitting connection between the first hydraulic pump 3 and the second hydraulic pump 4 can be selectively interrupted by means of a clutch 7 arranged in the transfer case 30 upstream of the transmission output y.Thus, in combustion operation, the combustion engine 5 can drive all hydraulic pumps 3, 4, 9, 10, 11 and in electric operation, the electric motor 8 drives directly through the transfer case only the first hydraulic pump 3 and the third hydraulic pumps 9, 10, 11, but not the second hydraulic pump 4.

[0046] The Fig. 13 shows a drive system for a truck-mounted concrete pump 1 with a transfer case 30 that is driven by the internal combustion engine 5 via the partial cardan shaft 33a for the wheel drive via the transmission input a. Accordingly, the transfer case 30 has a transmission output z opposite the transmission input a to the partial cardan shaft 33b for the wheel drive. The clutch 7 with the second hydraulic pump 4 is arranged on the transmission output w, which here is arranged, for example, on the same side of the transfer case 30 as the transmission input a. A hydraulic pump train consisting of the hydraulic pumps 3, 9, 10, 11 is arranged on the transmission output x and can be separated using the clutch 7. The hydraulic pump train is driven by the electric motor 8, which is arranged between the clutch 7 and the first hydraulic pump 3. In combustion operation, the internal combustion engine 5 drives all hydraulic pumps 3, 4, 9, 10, 11 when the clutch 7 is engaged, and the electric motor 8 runs at idle.When driven by the electric motor 8, the clutch 7 is opened, so that the drive force-transmitting connection between the first hydraulic pump 3 and the second hydraulic pump 4 is interrupted, and the electric motor 8 only drives the hydraulic pump train with the first hydraulic pump 3 and the third hydraulic pumps 9, 10, 11. Alternatively, the clutch 7 could also be arranged at the transmission output w in order to interrupt the connection to the second hydraulic pump 4 there.

[0047] The boundary between the first and second variant of the invention presented here becomes blurred in the drive system of the Fig. 13, because in principle, the first and second hydraulic pumps 3, 4 also form a first hydraulic pump train 6 via the transfer case 30, in which they are connected to transmit drive force, and the clutch 7 is assigned to this first hydraulic pump train in the sense of the first variant. The first drive motor 5 is connected to a first transmission input a of the transfer case 30 to transmit drive force, and the first hydraulic pump 3 is connected to a first transmission output x of the transfer case 30 to transmit drive force, and the second hydraulic pump 4 is connected to a second transmission output w of the transfer case 30 to transmit drive force. In this respect, many further combinations of the first and second variants of the invention presented are conceivable.

[0048] The Fig. Figure 14 shows a drive system for a truck-mounted concrete pump 1 of the second variant of the invention. The arrangement of the first and second hydraulic pumps 3, 4 and the drive by the combustion engine 5 correspond to the illustration of Fig. 8. The electric motor 8 operates as a generator when the transfer case 30 is driven by the combustion engine 5, driven via the transfer case 30, i.e. in principle as in connection with the Fig. 4 and Fig. 5. The transmission input a thus becomes the transmission output. The electric motor 8, used as a generator, produces electrical power, which in this exemplary embodiment is used, for example, to drive the electric motors 19a and 19b when no construction site power connection for purely electric operation is available on the construction site. The electric motor 19a here, for example, drives the third hydraulic pumps 10, 11 for a pipe switch 14 and an agitator 15. The electric motor 19b could, for example, be used for the direct electrical drive of a fan motor for cooling the hydraulic oil or the coolant of the electrical components. The hydraulic pump 9 for driving the articulated mast 13 and the support 14 is arranged at the transmission output y. The advantage of this drive system is that not all hydraulic pumps 3, 4, 9, 10, 11 are driven simultaneously and at the same speed.For example, it may be useful to flexibly adjust the speed of the hydraulic pump 10 driving the pipe switch 15 to the concrete delivery rate—for example, the pumping frequency of the concrete pumping device 2, which is designed as a two-cylinder piston pump—via the second electric motor 19a, thereby increasing the efficiency of the overall system. By directly driving a fan, for example, with the electric motor 19b, losses due to the hydraulic system can be completely avoided.

[0049] One of the basic ideas of the invention for both variants presented and their possible combinations is that the internal combustion engine 5 generally drives the first hydraulic pump 3 and the second hydraulic pump 4 simultaneously to drive the concrete pumping device 2, and by opening the clutch 7 during electrical operation, only the first hydraulic pump 3 is driven by the electric motor 8 to drive the concrete pumping device 2 in order to increase efficiency in electrical operation.

[0050] Particularly in the presented variants of the invention with the transfer case 30 and the clutch 7, it is also possible, for example, to have the combustion engine 5 drive only the first hydraulic pump 3 and to keep the clutch 7 to the second hydraulic pump 4 open, depending on the current concrete delivery rate of the concrete pumping device 2, especially when the concrete delivery rate is low. Only as the concrete delivery rate increases is the second hydraulic pump 4 activated by closing the clutch 7 to drive the concrete pumping device 2. The reason for this is that, in terms of efficiency, it is disadvantageous to operate two hydraulic pumps, which are usually designed as axial piston pumps, simultaneously with small swivel angles. By driving only one hydraulic pump, for example the first hydraulic pump 3, it can be operated with a large swivel angle, which leads to a significant increase in efficiency.

[0051] In the Fig. 15 is a spatial view of a drive system of the second variant according to the Fig.8 of the truck-mounted concrete pump 1. The electric motor 8, designed, for example, as a liquid-cooled synchronous motor, is flanged directly to the gearbox input b. The transfer case 30 can also be referred to as a transfer box due to the connection and disconnection of individual inputs and / or outputs. The entire unit has a very compact design, particularly compared to the first variant, and is relatively short, and can therefore be used in particular for truck-mounted concrete pumps 1 where only a limited installation space is available. In particular, the gearbox input b and the gearbox outputs w, x, y could, for example, have the same connection diagrams.Provided that the power flow transmission 31 within the transfer case 30 does not have to be adjusted or can be adjusted accordingly if necessary, the arrangement of the electric motor 8, the hydraulic pumps 3, 4, 8, 9, 10 and the clutch 7 on the transfer case 30 can then be handled very flexibly. List of reference symbols 1 truck-mounted concrete pump 2 concrete pumping device 3 first hydraulic pump 4 second hydraulic pump 5 first drive motor (combustion engine) 6 first hydraulic pump train 7 first clutch 8 second drive motor (electric motor) 9 third hydraulic pump (for articulated mast and outriggers) 10 third or additional hydraulic pump (for pipe switch) 11 third or additional hydraulic pump (for agitator) 12 control elements 13 articulated mast 14 Support 15 pipe switch 16 agitator 17 Second clutch 18 Second hydraulic pump train 19 Additional electric motor, 19a additional electric motor, 19b additional electric motor 20 Third clutch 21 Accumulator 22 turntables 23 Chassis 24 Articulated joint 25 mast segment 26 feed hoppers 27 Power take-off (PTO) 28 Construction site power connection 29 Hydraulic tank 30 transfer cases 31 Power transmission arrangement 32 Drive-side couplings, 32a first drive-side coupling, 32b second drive-side coupling 33 Cardan shaft wheel drive 33a first partial cardan shaft, 33b further partial cardan shaft 34 Cardan shaft (power take-off) 35 Connection 36 additional clutch a first transmission input b second transmission input w first transmission output x second transmission output y third transmission output z fourth transmission output

Claims

[1] Truck-mounted concrete pump (1) with - a hydraulically driven concrete pumping device (2), - a first hydraulic pump (3), - a second hydraulic pump (4), wherein the first and the second hydraulic pump (3, 4) are provided for the joint hydraulic drive of the concrete pumping device (2), and - a first drive motor (5) provided for mechanically driving the first hydraulic pump (3) and the second hydraulic pump (4) which are connected to transmit the drive force, characterized by a clutch (7) provided to selectively interrupt the drive force transmitting connection between the first hydraulic pump (3) and the second hydraulic pump (4). [2] Truck-mounted concrete pump (1) according to claim 1, characterized bythat the first and the second hydraulic pump (3, 4) form a first hydraulic pump train (6) in that they are connected to one another in a drive force-transmitting manner, wherein the clutch (7) is assigned to the first hydraulic pump train (6). [3] Truck-mounted concrete pump (1) according to claim 1 or 2, characterized by that the first drive motor (5) is an internal combustion engine. [4] Truck-mounted concrete pump (1) according to one of claims 1 to 3, characterized by a second drive motor (8), also provided for mechanically driving the first hydraulic pump train (6), wherein the coupling (7) is arranged in the hydraulic pump train (6) at a position between the first and the second drive motor (5, 8). [5] Truck-mounted concrete pump (1) according to claim 4, characterized byin that the first hydraulic pump train (6) comprises at least one third hydraulic pump (9, 10, 11), wherein the third hydraulic pump (9, 10, 11) is provided to drive adjusting elements (12) of an articulated boom (13) of the truck-mounted concrete pump (1) and / or adjusting elements (12) of a support (14) of the truck-mounted concrete pump (1) and / or a pipe switch (15) of the truck-mounted concrete pump (1) and / or an agitator (16) of the truck-mounted concrete pump (1) and / or another auxiliary unit of the truck-mounted concrete pump (1). [6] Truck-mounted concrete pump according to claim 5, characterized by that the third hydraulic pump (9, 10, 11) in the first hydraulic pump train (6) is located at a position between the clutch (7) and the second drive motor (8). [7] Truck-mounted concrete pump (1) according to claim 6, characterized bya further coupling (17) associated with the first hydraulic pump train (6), designed to selectively interrupt the drive force transmitting connection between the third hydraulic pump (9, 10, 11) and the first or the second hydraulic pump (3, 4). [8] Truck-mounted concrete pump (1) according to one of claims 4 to 7, characterized by that the second drive motor (8) is an electric motor. [9] Truck-mounted concrete pump (1) according to claim 8, characterized by that the electric motor (8) can be driven as a generator by the first drive motor (5) via the first hydraulic pump train (6). [10] Truck-mounted concrete pump (1) according to one of the preceding claims, characterized byat least one second hydraulic pump train (18) comprising at least one further hydraulic pump (10, 11), wherein the further hydraulic pump (10, 11) is provided to drive actuating elements (12) of an articulated boom (13) of the truck-mounted concrete pump (1) and / or actuating elements (12) of a support (14) of the truck-mounted concrete pump (1) and / or a pipe switch (15) of the truck-mounted concrete pump (1) and / or an agitator (16) of the truck-mounted concrete pump (1) and / or another auxiliary unit of the truck-mounted concrete pump (1), wherein a further electric motor (19) is provided for the mechanical drive of the further hydraulic pump train (18). [11] Truck-mounted concrete pump (1) according to claims 9 and 10, characterized by that the electric motor (8) driven as a generator by the first drive motor (5) via the first hydraulic pump train (6) supplies the further electric motor (19) with power. [12] Truck-mounted concrete pump (1) according to one of the preceding claims, characterized bythat at least one of the clutches (7, 17, 20) is designed as a freewheel or as a switchable clutch. [13] Truck-mounted concrete pump (1) according to claim 1, characterized by in that the first drive motor (5) is connected to a first transmission input (a) of a transfer case (30) in a drive-force-transmitting manner, wherein the first hydraulic pump (3) is connected to a first transmission output (w) of the transfer case (30) and the second hydraulic pump (4) is connected to a second transmission output (x) of the transfer case (30) in a drive-force-transmitting manner. [14] Truck-mounted concrete pump (1) according to claim 13, characterized by that the clutch (7) is assigned to the transfer case (30). [15] Truck-mounted concrete pump (1) according to claim 14, characterized by that the clutch (7) is integrated into the transfer case (30). [16] Truck-mounted concrete pump (1) according to claim 14, characterized bythat the clutch (7) is arranged outside the transfer case (30) between the second hydraulic pump (4) and the first transmission output (x). [17] Truck-mounted concrete pump (1) according to one of claims 13 to 16, characterized by that the first drive motor (5) is an internal combustion engine. [18] Truck-mounted concrete pump (1) according to one of claims 13 to 17, characterized by a second drive motor (8) arranged at a second transmission input (b) of the transfer case (30), also provided for mechanically driving the transfer case (30), via which the second drive motor (8) and the second hydraulic pump (4) are connected in a drive-force-transmitting manner, wherein the clutch (7) is designed for selectively interrupting the drive-force-transmitting connection between the second hydraulic pump (4) and the second drive motor (5). [19] Truck-mounted concrete pump (1) according to claim 18, characterized by that the second drive motor (8) is an electric motor. [20] Truck-mounted concrete pump (1) according to claim 19, characterized by that the electric motor (8) can be driven as a generator by the first drive motor (5) via the transfer case (30). [21] Truck-mounted concrete pump (1) according to one of claims 13 to 20, characterized by in that the transfer case (30) is connected to at least one third hydraulic pump (9, 10, 11) via a third transmission output (y) in a drive-force-transmitting manner, wherein the at least one third hydraulic pump (9, 10, 11) is provided to drive actuating elements (12) of an articulated boom (13) of the truck-mounted concrete pump (1) and / or actuating elements (12) of a support (14) of the truck-mounted concrete pump (1) and / or a pipe switch (15) of the truck-mounted concrete pump (1) and / or an agitator (16) of the truck-mounted concrete pump (1) and / or another auxiliary unit of the truck-mounted concrete pump (1). [22] Truck-mounted concrete pump (1) according to claim 21, characterized bya further clutch (17) associated with the transfer case (30) for selectively interrupting the drive force transmitting connection between the transfer case (30) and the at least one third hydraulic pump (9, 10, 11). [23] Truck-mounted concrete pump (1) according to one of the preceding claims, characterized by that the first hydraulic pump (3) and the second hydraulic pump (4) are designed for different delivery volumes.

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