ROAD CONSTRUCTION MACHINE AND BUILT-IN TRAIN WITH ROAD CONSTRUCTION MACHINE AND MOBILE SERVICING MACHINE

Description

[0001] The invention relates to a road construction machine in the form of a road paver or a feeder for conveying paving material to a road paver, as well as to a paving train comprising a road construction machine and a mobile supply machine, to a method for operating the paving train and to the use of an interface of a road construction machine.

[0002] Such a road paver is known from EP 1 118 714 B1 and such a feeder is known from EP 2 110 341 A1.

[0003] EP 4 098 479 A1 concerns service vehicles for road construction sites and road construction machines that can dock to a service vehicle.

[0004] US 2021 / 008997A1 shows an installation system that includes a control system configured to control the refueling and / or reloading of various machines.

[0005] Conventional road construction machines typically use diesel fuel as their energy source. The chemical energy of the diesel fuel is converted into mechanical energy by a diesel engine, which powers actuators. These actuators then usually perform rotary or translational movements. The road construction machine uses these movements to carry out its work and subtasks. For a paver, this would include, for example, driving, steering, conveying material, distributing material, leveling, and compacting material. For a material handler, it would include, for example, driving, steering, and conveying material. Rotary movements are implemented, for example, using hydraulic motors, while translational movements are achieved, for example, by hydraulic cylinders. For the screed heating system of a paver, mechanical energy is converted into electrical energy by a generator, which is then converted into heat.The disadvantages of this drive mechanism are the use of fossil fuels (e.g. diesel fuel) and the associated exhaust emissions.

[0006] In contrast, the reduced range of the paving train is problematic for electrified road construction machines. Current diesel-powered pavers are designed to operate for approximately 10 hours on a single tank of fuel, achieving a certain range. This assumes high to maximum utilization of the paver. Using an energy storage system for an electric paver, such as a battery or accumulator as the energy source and an electric drive train, would require significantly larger and heavier energy storage units to achieve similar ranges, due to the lower energy density of a battery compared to diesel fuel. Since this can only be implemented to a limited extent without drastically increasing the size of the paver, the consequence is a significant reduction in operating time.The amount of work a paver can perform with a single energy storage charge is limited. Therefore, the battery would need to be replaced or recharged once or several times due to the reduced range of an electric paver powered by a battery. Alternatively, the paver with an empty battery would have to be driven away from the construction site so that another paver with a charged battery could be used as a replacement. Consequently, the construction site would have to be interrupted, either temporarily or for an extended period. Interrupting the construction site is not only detrimental to energy efficiency (e.g., the screed and material conveyors have to be reheated after the interruption), but also to paving quality. Interruptions can potentially lead to starting marks, segregation, temperature drops in the mix, compaction problems, and even the cooling and hardening of the paving material within the paver.

[0007] The object of the present invention is to eliminate or at least reduce the aforementioned disadvantages.

[0008] This task is solved by the road construction machine according to claim 1 or the installation train according to claim 7 or the method according to claim 11 or the use according to claim 14.

[0009] The invention relates to a road construction machine in the form of a paver or a feeder vehicle for conveying paving material to a paver, wherein the road construction machine is self-propelled and has a primary drive, a material hopper, at least one electrical consumer, and at least one energy medium tank. The road construction machine can be connected to the mobile supply unit, in particular to a connection unit of the mobile supply unit, via an interface for transferring energy medium, preferably fuel, diesel, natural gas, hydrogen, or liquids required for operating the galvanic cells. The interface is arranged at a docking end of the road construction machine, preferably at a pusher unit of the road construction machine. The invention enables the creation of a local construction site where the road construction machines can be operated exclusively with alternative energy sources.This allows exhaust emissions on the construction site to be reduced or completely eliminated. Such construction sites are particularly desirable in city centers, tunnels, or buildings. A further advantage of the invention is the extension of the operating time and range of a mobile road construction machine, as road construction operations do not have to be stopped when the machine runs out of power. The invention can also reduce interruptions in the paving process and thus improve the paving quality. The interface allows the road construction machine to be mechanically connected to the mobile supply unit. The road construction machine can then push the mobile supply unit in one direction of travel, for example, in the paving direction, via this mechanical connection.During a joint journey between the road construction machine and the mobile supply vehicle, materials and energy can be transferred from the mobile supply vehicle to the road construction machine. Energy can be transferred from the mobile supply vehicle's energy tank to the road construction machine's energy tank via the mobile supply vehicle's interface. The energy can be transferred via a pipeline or a corrosion-resistant pipeline. One of the pipeline's inlets can be connected to the interface, and the other to the connection unit. The pipeline can run beneath the material bunker to an energy tank.

[0010] Preferably, the road construction machine has an additional interface. This interface allows the road construction machine to be connected to the mobile power supply unit, or to an additional connection unit of the mobile power supply unit, for the transmission of electrical energy. The additional interface allows the road construction machine to dock with the mobile power supply unit, or vice versa. The additional interface allows the road construction machine to be mechanically and / or electrically connected to the mobile power supply unit. The road construction machine can push the mobile power supply unit in a direction of travel, for example, in the direction of paving, via the mechanical connection. During a joint journey of the road construction machine and the mobile power supply unit, paving material and energy or electrical energy can be transported from the mobile power supply unit to the road construction machine.An electrical circuit can be connected at the other interface. An electrical line connected at this interface can be connected to the energy storage device and / or to one of the electrical loads. The electrical line can be routed under the material bunker to an energy storage device or one of the electrical loads in an insulating sleeve.

[0011] An energy source can be an energy carrier. Energy sources can be transferred from the mobile supply unit to the road construction machine. An energy source can be a fluid required for energy generation in galvanic cells, for example, an electrolyte. An energy source can be a fuel for fuel cells, for example, hydrogen. The primary drive of the road construction machine can be a hydrogen combustion engine. Hydrogen as an energy source can be transferred from the mobile supply unit to the road construction machine. An energy source can be a fuel such as gasoline or diesel. The primary drive of the road construction machine can be a hybrid drive, comprising, for example, an electric motor and a diesel engine. Diesel can be transferred as an energy source from the mobile supply unit to the road construction machine. The energy storage device can be a battery or accumulator (rechargeable battery).be a lithium-ion battery.

[0012] By connecting the interface to the connection unit, the road construction machine can transmit power to the mobile power supply unit. The interface of the road construction machine can be an electromechanical component. The connection unit of the mobile power supply unit can be an electromechanical component. The interface and the connection unit can be related electromechanical units. The electromechanical component can have at least one mechanical component. The electromechanical component can have at least one electrical conductor. The electromechanical component can be at least partially covered on its outer surface with an insulating sheath.An electrical circuit can be closed or opened by connecting the interface of the road construction machine and the connection unit of the mobile power supply machine. The electromechanical component can have a male part, or plug. The electromechanical component can have a female part, or socket. The interface of the road construction machine can have a locking mechanism to mechanically secure the interface and the connection unit together, at least during power transmission and / or energy transfer. The connection unit of the mobile power supply machine can have a locking mechanism to mechanically secure the connection unit and the interface together, at least during power transmission and / or energy transfer.

[0013] Preferably, the road construction machine can be loaded with paving material from the mobile supply vehicle. The material bunker of the road construction machine can be at least partially filled with paving material supplied by the mobile supply vehicle. The mobile supply vehicle can be, for example, a material delivery vehicle or a delivery truck. The mobile supply vehicle can have a material hopper or a receiving container, preferably a tipping storage bunker, to transport paving material to the road construction machine. The advantage of this is the mobility of the delivery truck outside the construction site and its interchangeability within the construction site without interrupting the construction process. Using a delivery truck as a mobile supply vehicle can also offer the following advantages: A delivery truck can travel between a construction site and a mixing plant, for example.The mobile supply unit shuttles between an electric charging station (it is also possible that an electric charging station is located at the mixing plant) while the road construction machine or paver continuously lays material, or a feeder vehicle continuously transports paving material to the paver. This allows the road construction machine to be loaded with paving material while it is being electrically recharged. The mobile supply unit can have an electric motor and at least one rechargeable and replaceable energy storage device, thus making the construction site free of exhaust emissions. The energy storage device can be a battery or accumulator (rechargeable battery), a lithium-ion battery, or a capacitor. Furthermore, the mobile supply unit can supply the road construction machine with preheated paving material.It is conceivable that the installation material in the mobile supply machine, for example during a journey between a mixing plant and the construction site, is already warmed up, preferably to a temperature between 30°C and 250°C, and more preferably to a temperature between 60°C and 120°C.

[0014] Advantageously, the second interface is located at one end of the road construction machine. This allows both interfaces to be connected to a coupling unit located on one side of the chassis of the mobile supply unit, enabling the road construction machine to move the mobile supply unit during road surface construction. Advantageously, road surface construction can be carried out continuously while the road construction machine continuously installs material and is supplied with electrical power, energy, and / or installation material by the mobile supply unit.

[0015] Preferably, the interface and / or the further interface are arranged on a pusher unit of the road construction machine. The pusher unit can comprise at least one or more push rollers. The push rollers can be arranged on a chassis component, such as a crossbeam, which is mounted on the road construction machine. The pusher unit can be movably mounted by means of a spring-damper unit. The interface and / or the further interface can be arranged between two rotatably mounted push rollers. When the push rollers dock onto the tires of the mobile supply machine, the tires can deform elastically. This can prevent installation errors in the road surface.

[0016] Advantageously, the interface has at least one opening, the opening being suitable for receiving a connecting unit of the mobile supply vehicle. The connecting unit can extend from a chassis of the mobile supply vehicle in one direction of travel of the mobile supply vehicle. The interface can be designed as a coupling jaw with a pipe opening. The connecting unit can be designed as a spacer bar with a pipe opening.

[0017] Advantageously, the interface and / or the additional interface each have an opening for receiving a connection unit of the mobile supply unit. Advantageously, the additional interface has at least one opening, the opening being suitable for receiving another connection unit of the mobile supply unit. The additional interface may have several contact openings. The additional connection unit may have a pin header that can be received in at least the first opening. The additional connection unit may extend from a chassis of the mobile supply unit in one direction of travel of the mobile supply unit. The additional interface may be designed as a tow hook. The additional connection unit may be designed as a spacer bar.

[0018] Advantageously, the energy storage device can be at least partially recharged with electrical energy transferred from the mobile power supply unit. The mobile power supply unit can transfer an energy of 0.5 kWh to 25 kWh, preferably 1 kWh to 10 kWh, and more preferably 2 kWh to 5 kWh, to the road construction machine within a predetermined period. Advantageously, the primary drive of the road construction machine can be directly supplied with electrical energy transferred from the mobile power supply unit. For this purpose, a power supply path can electrically connect the additional interface directly to the primary drive of the road construction machine.

[0019] The road construction machine may have a control system. This control system may be configured to monitor the (electrical) charge level of the road construction machine's energy storage system. The control system may be configured to initiate a transfer of electrical energy from the mobile power supply unit to the road construction machine when the charge level is between 20% and 90%, preferably between 30% and 80%. The control system may include a charge controller. The charge controller may be connected to the energy storage system.

[0020] The invention further relates to a paving train comprising at least one road construction machine according to the invention, wherein the paving train has a mobile supply machine with at least one connecting unit, wherein the interface of the road construction machine can be connected to the connecting unit of the mobile supply machine for energy transfer.

[0021] The paving train can be used to construct a road surface. The paving train can include a paver and a mobile supply vehicle preceding the paver. Alternatively, the paving train can include a paver and a feeder vehicle preceding the paver, as well as a mobile supply vehicle preceding the feeder vehicle. Advantageously, the interface and the connection unit are integrated electromechanical components.

[0022] Advantageously, the mobile supply vehicle is a material delivery vehicle, specifically a material delivery vehicle for supplying paving material, e.g., a delivery truck. The mobile supply vehicle can have a material hopper or receiving container, preferably a tipping storage bunker, to transport paving material to the road construction machine. The mobility of the delivery truck outside the construction site and its interchangeability within the site can be advantageous. A delivery truck can shuttle between a construction site and a mixing plant and, for example, an electric vehicle charging station (it is also possible that an electric vehicle charging station is located at the mixing plant), while the road construction machine continuously installs material. The electrically charged delivery truck can connect to the road construction machine at the construction site and transfer paving material to the material bunker.The delivery truck can then leave the construction site to be recharged and / or refueled. The mobile supply unit of the paving train can be interchangeable. It is possible that several mobile supply units are present on the construction site to ensure uninterrupted construction work. It is possible that the mobile supply units are powered by an internal combustion engine or a hybrid engine when operating outside the construction site.

[0023] Advantageously, the mobile supply machine is a material delivery vehicle, in particular a material delivery vehicle for the delivery of installation material, e.g. a delivery truck.

[0024] In one embodiment of the invention, an energy storage device of the mobile supply machine is interchangeable with, or replaces, the energy storage device of the road construction machine. The mobile supply machine can have at least one energy storage device, preferably two, and more preferably three to five, which can be individually interchangeable. A module with several energy storage devices of the mobile supply machine can be installed on a passenger seat on a chassis or running gear of the mobile supply machine. The energy storage devices of the mobile supply machine can be individually installed on a free passenger seat.

[0025] Preferably, the interface of the road construction machine and the connecting unit of the mobile supply machine are suitable for electromechanical coupling. Advantageously, the mobile supply machine can be moved away from the road construction machine in one direction of travel of the paving train, particularly during power transmission and / or energy transfer.

[0026] The invention further relates to a method for operating a paving train, comprising at least one road construction machine in the form of a paver or a feeder vehicle for conveying paving material to a paver, wherein the road construction machine is self-propelled and has a primary drive, a material hopper, at least one electrical consumer, and at least one energy medium tank, wherein the paving train includes a mobile supply unit, preferably a mobile supply unit with a material hopper for delivering paving material to the road construction machine. The method comprises connecting an interface of the road construction machine to a connection unit of the mobile supply unit for transferring energy medium, preferably fuel, diesel, natural gas, hydrogen, or liquids required for operating the galvanic cells, from the mobile supply unit to the road construction machine.The interface is located at a docking end of the road construction machine, preferably at a push device of the road construction machine.

[0027] The interface can be mechanically connected to the connection unit. The road construction machine can dock with the mobile supply unit. The mobile supply unit can be moved by the road construction machine in one direction of travel of the paving train, particularly during the transfer of electrical power. The method can include connecting another interface of the road construction machine to another connection unit of the mobile supply unit for the transfer of electrical power from the mobile supply unit to the road construction machine. The method can also include connecting an interface of the road construction machine to a connection unit of the mobile supply unit for the transfer of paving material from the mobile supply unit to the road construction machine.

[0028] The method may include the following process steps: monitoring the initial charge level of an energy storage device of the road construction machine, and transferring electrical energy from the mobile supply machine to the road construction machine when the initial charge level is between twenty percent and ninety percent, preferably between thirty percent and eighty percent.

[0029] The invention further relates to the use of an interface of a road construction machine for mechanical coupling with a connecting unit of a mobile power supply unit for energy transfer, wherein the road construction machine can be connected to the mobile power supply unit via an interface for the transfer of energy, preferably fuel, diesel, natural gas, hydrogen, or liquids required for operating the galvanic cells. The interface is arranged at a docking end of the road construction machine, preferably at a pusher unit of the road construction machine. All features and advantages disclosed in connection with the road construction machine can be used individually or together in the paving train, in the method, or in the application.All features disclosed in connection with the method may be used individually or in combination in the road construction machine, the paving train, or in the application. All features disclosed in connection with the paving train may be used individually or in combination in the road construction machine, the method, or in the application. All features disclosed in connection with the application may be used individually or in combination in the road construction machine, the method, or the paving train.

[0030] The following section explains background information and exemplary embodiments with reference to the figures. Fig. 1 a schematic perspective view of a road construction machine in the form of a road paver, Fig. 2a schematic perspective view of a road construction machine in the form of a feeder vehicle for conveying paving material to a road paver, Fig. 3 a schematic perspective view of a mobile supply machine, Fig. 4 a schematic representation of an installation train comprising the road construction machine and the mobile supply machine, Fig. 5 a schematic representation of the installation train of Figure 4 in a docking state, Fig. 6 a schematic representation of an installation train, comprising the road construction machine and the mobile supply machine, Fig. 7 a schematic representation of the installation train of Figure 6 in a docking state.

[0031] Only the Figures 6 and 7 show embodiments of the invention. Figures 1 to 5 These are for background information only.

[0032] Figure 1Figure 1 shows a perspective view from a slightly oblique front view of a road construction machine 1, which is a road paver 2 for producing a road surface ES. The road paver 2 is self-propelled, traveling in one direction R. The road paver 2 has a primary drive 3. The primary drive 3 of the road paver 2 is an electric motor 3a. The electric motor 3a is electrically supplied by an energy storage device E of the road paver 2. The road paver 2 further comprises a chassis 4, an operator's platform 5, a driver's roof 6, a material hopper 7 for receiving a paving material B (asphalt mix), a paving screed 8 mounted on the chassis 4 in a height-adjustable manner and towed in a direction of travel R, and a conveying unit 9 comprising a conveyor belt 9a to supply the paving material B from the material hopper 7 of the road paver 2 to the paving screed 8 by means of a transverse distributor 10 of the road construction machine 1.

[0033] The paver 2 has at least one electrical consumer 11. A first electrical consumer 11a is a light for illuminating the surroundings or the operator's station 5. A second electrical consumer 11b is a heater for heating the screed 8. The screed 8 comprises components such as compaction units (smoothing plates, tampers, and pressure bars (not shown)). The paving material B is compacted by the weight of the compaction unit. To prevent the paving material B from sticking to the components of the screed 8, heating devices (not shown) can be integrated into these components.

[0034] The road paver 2 includes a push device 12 for smooth docking, e.g. with a material delivery vehicle (not shown in the Figure 1A coupling device 13 is provided on the central section of the pusher 12, which can be directly connected to a material delivery vehicle (not shown). Docking elements 14 are also arranged on the pusher 12. The docking elements 14 are designed as rotatably mounted push rollers. When docking, the docking elements 14 come into contact with, for example, an approaching material delivery vehicle and enable the material delivery vehicle to be pushed forward smoothly.

[0035] A (first) interface 15 is provided on the coupling device 13. The interface 15 is an electromechanical unit suitable for electrical power transmission and mechanical coupling.

[0036] Figure 2Figure 1 shows a perspective view from a slightly oblique front view of a road construction machine 1, which is a feeder vehicle 18 for conveying paving material B to a following road paver 2. The feeder vehicle 18 is self-propelled and includes a primary drive 3'. The primary drive 3' of the road construction machine 1 is an electric motor 3a'. The electric motor 3a' is electrically supplied by an energy storage device E' of the feeder vehicle 18. The feeder vehicle 18 comprises a chassis 4', an operator's platform 5', a driver's roof 6', a material hopper 7' for receiving the paving material B, and a conveying unit 9' comprising a conveyor belt 9a' to transport the paving material B' from the material hopper 7' of the feeder vehicle 18 to the material hopper 7' of the road paver 2.

[0037] The feeder vehicle 18 has at least one electrical consumer 11'. A first electrical consumer 11a' is a light for illuminating the surroundings or the operator's station 5'. A second electrical consumer 11b' is a heating device for heating the conveyor belt 9a'.

[0038] The feeder vehicle 18 includes a pusher device 12' for smooth docking, e.g., to a material supply vehicle (not shown in the Figure 2 A coupling device 13' is provided on the central section of the pusher 12', which can be directly connected to a material delivery vehicle (not shown). Docking elements 14' are also arranged on the pusher 12'. The docking elements 14' are designed as rotatably mounted push rollers. When docking, the docking elements 14' come into contact with, for example, an approaching material delivery vehicle, and enable the material delivery vehicle to be pushed forward smoothly.

[0039] The coupling device 13' has an interface 15'. The interface 15' is an electromechanical unit suitable for electrical power transmission and mechanical coupling.

[0040] Figure 3Figure 1 shows a schematic perspective view of a mobile supply machine 19, or a material delivery vehicle 19a, in the form of a truck, a tipper truck, or a dump truck. The mobile supply machine 19 is self-propelled. It comprises a driver's control station 20, a chassis 21, and a primary drive 22. The primary drive 22 can be an electric motor, a hydrogen engine, an internal combustion engine, or a fuel cell or hydrogen combustion engine. The primary drive 22 can be a hybrid drive comprising at least two of the aforementioned different drives. The mobile supply machine 19 includes a material hopper 23 for transferring installation materials. The material hopper 23 is tiltable. The mobile supply machine 19 includes an energy storage device 24, which is replaceable and rechargeable.The energy storage device 24 can be arranged in an energy storage module 25, which comprises several energy storage devices 24. The energy storage device 24, or the energy storage module 25, is, for example, attached to a passenger-side position 26 of the driver's control station 20, so that the energy storage devices 24 are easily accessible and replaceable from a passenger-side entry direction (opposite a direction of travel R1 of the mobile supply machine 19).

[0041] Figure 4 Figure 1 shows a schematic representation of a paving train 27, comprising the road construction machine 1 in the form of the paver 2 or the feeder vehicle 18 and the mobile supply vehicle 19. The paving train 27 is movable in one direction R of travel of the paver 2. The mobile supply vehicle 19 is slowly driven backwards (against the direction of travel R) towards the road construction machine 1 and docked when the road construction machine 1 is supplied with paving material and / or electrical power.

[0042] A control system 28 of the road construction machine 1 monitors the (electrical) charge level 29 of the energy storage device E, E' of the road construction machine 1. When the charge level 29 is between twenty percent and ninety percent, electrical energy is supplied to the energy storage device E, E' of the road construction machine.

[0043] The road construction machine 1 comprises a first interface 15a at a docking end 30 or at the coupling device 13, 13'. The first interface 15a is an electromechanical unit suitable for electrical energy transmission. The first interface 15a, or electromechanical unit of the road construction machine 1, comprises a first opening 31 for receiving a connection unit 32, or a first connection unit 32a of the mobile power supply machine 19 for electrical energy transmission. The first connection unit 32a is an electromechanical unit. The first connection unit 32a is arranged at a docking side 33, or at a discharge end 34 of the mobile power supply machine 19. When the first connection unit 32a is connected to the first interface 15a, electrical energy is transferred from the energy storage device 24 of the mobile power supply machine 19 to the road construction machine 1.

[0044] Figure 5Figure 1 shows a schematic representation of the paving train 27 in a docking state 35, or energy transfer state, in which the mobile supply unit 19 is docked to the road construction machine 1. In this position, the mobile supply unit 19 is mechanically and electrically connected to the road construction machine 1. During docking, the docking elements 14, 14' are pressed against the tires (not shown) of the mobile supply unit 19. In the docking state 35, the energy storage units E, E' of the road construction machine 1 are electrically charged. Furthermore, the first interface 15a of the road construction machine 1 is mechanically connected to the first connecting unit 32a of the mobile supply unit 19. This allows the approaching road construction machine 1 to move the mobile supply unit 19 in the direction of travel R.

[0045] The energy storage device E, E' of the road construction machine 1 is connected to the first interface 15a of the road construction machine 1 via a first power supply path 36.

[0046] Two separate power supply paths 37, 38 lead away from the energy storage device E, E' of the road construction machine 1. In a second power supply path 37, the energy storage device E supplies the electric motor 3a, 3a' of the road construction machine 1. In a third power supply path 38, the energy storage device E, E' of the road construction machine 1 directly supplies the electrical consumer 11, 11' of the road construction machine 1 with current.

[0047] The first connection unit 32a of the mobile supply machine 19 is connected to the energy storage unit 24 of the mobile supply machine 19 via a fourth power supply path 39.

[0048] In docking state 35 it is also possible to bring the material hopper 23 of the mobile supply machine 19 into a tipping state and to load the material bunker 7, 7' of the road construction machine 1 with installation material B, B' (not shown).

[0049] Figure 6Figure 1 shows the installation train 27 in another embodiment. The road construction machine 1 comprises a second interface 15b at the docking end 30, or at the coupling device 13, 13'. The second interface 15b includes a second opening 40 for receiving energy medium 41 as well as fuel, diesel, natural gas, hydrogen, or liquids required for operating the galvanic cells, from the mobile supply unit 19. The mobile supply unit 19 comprises a second connection unit 32b for transferring energy medium 41 to the road construction machine 1. The second connection unit 32b is an electromechanical unit. The second connection unit 32b is arranged at the docking side 33, or at the discharge end, of the mobile supply unit 19. The energy medium 41 is transported from the mobile supply unit 19 to the road construction machine 1 when the mobile supply unit 19 is in the docking state 35.The second interface 15b is connected to the second connection unit 32b to transfer energy 41 from the mobile supply machine 19 to the road construction machine 1. Energy 41 is supplied from an energy container 42 of the mobile supply machine 19 to the second connection unit 32b via a pipe 43. Energy 41 is then supplied via a line (pipe) 44 to an energy tank 45 of the road construction machine 1.

[0050] Figure 7Figure 1 shows the paving train 27 in a different embodiment. In this embodiment, the road construction machine 1 comprises two interfaces at the docking end 30, or at the coupling device 13, 13': the first interface 15a for energy transmission from the mobile power supply unit 19 and the second interface 15b for the transmission of energy medium 41 from the mobile power supply unit 19. Accordingly, the mobile power supply unit 19 comprises the first connection unit 32a and the second power supply unit 32b. The operation of these units is explained above.

Claims

1. Road-making machine (1) designed as a road finisher (2) or a loading vehicle (18) for supplying paving material (B, B') to a road finisher (2) wherein the road-making machine (1) is self-propelled and comprises a main drive (3, 3'), a hopper (7, 7') for materials, at least one electric load (11, 11') and at least one tank for propellant, wherein the road-making machine (1) can be coupled to a mobile supplying machine (19) via an interface (15b) for transferring a propellant (41), preferably fuel, diesel, natural gas, hydrogen or liquids required for operating galvanic cells, wherein via the interface (15b) propellant from a propellant tank of the mobile supplying machine can be transferred to the propellant tank off the road-making machine (1), characterized in that the interface (15b) is arranged at a docking end (30) of the road-making machine (1), preferably at a moving means (12, 12') of the road-making machine (1).

2. Road-making machine according to claim 1, characterized in that paving materials can be supplied to the road-making machine (1) by the mobile supplying machine (19).

3. Road-making machine according to claim 1 or claim 2, characterized in that the road-making machine can be coupled to the mobile supplying machine (19) via a further interface (15a) for transferring electric energy, wherein the road-making machine (1) includes at least one energy storage (E, E').

4. Road-making machine according to claim 3, characterized in that the further interface (15a) is arranged at a docking end (30) of the road-making machine (1), preferably at a moving means (12, 12') of the road-making machine (1).

5. Road-making machine according to any one of the preceding claims, characterized in that the road-making machine (1) can be mechanically coupled to the mobile supplying machine (19) via the further interface (15a) and / or the interface (15b) so that the road-making machine (1) can transfer power to the mobile supplying machine (19).

6. Road-making machine according to any one of the preceding claims, characterized in that the further interface (15a) and / or the interface (15b) each comprise a port (31, 40) for receiving a coupling unit of the mobile supplying machine (19).

7. Pave train (27) comprising at least one road-making machine (1) according to claim 1, wherein the pave train (27) includes a mobile supplying machine (19) having at least one coupling unit (32b), wherein the interface (15b) of the road-making machine (1) can be coupled to the coupling unit (32b) of the mobile supplying machine (19) for transferring a propellant.

8. Road-making machine according to claim 7, characterized in that the mobile supplying machine (19) is a vehicle (19a) for supplying material, in particular a vehicle (19a) for supplying paving material (B, B').

9. Pave train according to claim 7 or 8, characterized in that the interface (15b) and the coupling unit (32b) are the associated electromechanical units.

10. Pave train according to anyone of claims 7 through 9, characterized in that a further interface (15a) of the road-making machine (1) and a further coupling unit (32a) of the mobile supplying machine (19) can be coupled to each other for transferring electric energy.

11. Method for operating a pave train comprising at least one road-making machine (1) according to claim 1, wherein the pave train (27) includes a mobile supplying machine (19), preferably a mobile supplying machine (19) having a trough (23) for materials for supplying paving material (B, B') to the road-making machine, wherein the method comprises: - coupling the interface (15b) of the road-making machine (1) to a coupling unit (32b) of the mobile supplying machine (19) for transferring a propellant, preferably fuel, diesel, natural gas, hydrogen or liquids required for operating galvanic cells, from the mobile supply machine (19) to the road-making machine (1).

12. Method according to claim 11, further comprising - coupling a further interface (15a) off the road-making machine (1) to a further coupling unit (32a) of the mobile supplying machine (19) for transferring electric energy from the mobile supply machine (19) to the road-making machine (1).

13. Method according to claim 12, further comprising - monitoring the charge level (29) of an energy storage (E, E') of the road-making machine (1), - transferring electric energy from the mobile supply machine (19) to the road-making machine (1) when the charge level (29) is between 20% and 90%, preferably between 30% and 80%.

14. Use of an interface (15b) of a road-making machine (1) according to claim 1 for mechanically coupling to a coupling unit (31b) of a mobile supplying machine (19) for transferring a propellant.