CONSTRUCTION MACHINE, IN PARTICULAR A TANDEM ROLLER, AND A METHOD FOR CONVERSIONING A CONSTRUCTION MACHINE

Abstract

The invention relates to a construction machine, in particular a tandem roller, comprising a main machine and an attachment drive module connectable to the main machine. The invention further relates to a method for converting a construction machine with a primary drive unit into a construction machine with a primary drive unit and a secondary drive unit by means of an attachment drive module.

Description

[0001] The invention relates to a construction machine, in particular a tandem roller, and to a method for converting a construction machine.

[0002] Construction machinery, particularly tandem rollers, is extensively described in the prior art, for example in EP4074894A1. Construction machinery can, for instance, include an internal combustion engine that drives one or more pumps of a hydraulic system, for example to provide drive power and / or drive power to one or more working units, as disclosed, for example, in DE 10 2017 011 476 A1. Due to steadily increasing emission limits during the operation of such construction machinery, it is also already known to electrify such machinery, as described, for example, in DE 10 2019 002 439 A1. This can include fully electrified construction machinery, which is exclusively powered by electric motors and may even lack an internal combustion engine. Electrohydraulic drive concepts are also described in the prior art.Construction machinery without combustion engines offers the advantage of being virtually emission-free. The disadvantage is that, in these cases, the user is typically reliant on an electrical power supply as the primary drive energy source, for example, a battery.

[0003] To enable the optional operation of a construction machine in both internal combustion engine and electric motor drive modes, so-called hybrid machines are already known in the prior art. These typically comprise both an internal combustion engine and an electric motor, both of which can be used individually or in combination as primary drive sources, as disclosed, for example, in EP2353956B1. The disadvantage of these machines is that they are comparatively expensive simply due to the dual primary drive sources.

[0004] Currently, users only have the option of using a construction machine with an exclusively combustion engine as its primary drive, which increasingly conflicts with legal requirements and / or stipulations from construction project tenders; using a construction machine with an exclusively electric motor, which usually means purchasing a new construction machine and comes with the disadvantages of fully electrified drive systems, such as the comparatively limited range; or, also usually as a new purchase, using a hybrid machine, which can be comparatively expensive to purchase and complex to maintain.

[0005] Based on this, the object of the invention is to provide a method that allows an operator of a construction machine to selectively operate the machine using either an internal combustion engine or an electric motor as the primary drive source, while simultaneously being comparatively cost-effective. It is particularly desirable if conventional construction machines, currently typically powered solely by internal combustion engines, could also be operated, at least temporarily, from an electric motor as the primary drive source, bypassing the internal combustion engine.

[0006] The problem is solved using a construction machine and a method according to the independent claims. Preferred embodiments are specified in the dependent claims.

[0007] A first aspect of the invention relates to a construction machine, in particular a road construction machine and / or soil compaction machine, especially a tandem roller. The construction machines relevant here can be, in particular, self-propelled construction machines. Such construction machines thus include their own drive system and generate the drive energy required for travel and operation themselves. Road construction machines are construction machines used in road and path construction, for example, in the construction and / or rehabilitation of roads, paths, and runways. Typical road construction machines can be, for example, road milling machines, asphalt pavers, and soil compaction machines such as rollers.Soil compaction machines can be, for example, so-called roller trains used in general subsurface work, particularly soil compaction, or tandem rollers and / or pneumatic tire rollers used especially for compacting asphalt. These road and / or soil compaction machines can have one or more drive systems. These can be in the form of wheels and / or tracks, but in the case of soil compaction machines, they can also be in the form of one or more roller drums, particularly those that are essentially drum-shaped and hollow cylindrical. Such construction machines can include one or more working units, such as vibrators, a milling drum, a screed, etc. Therefore, in addition to the drive system, these machines can include one or more additional drive motors that, for example, power the working unit(s).

[0008] According to the invention, the construction machine comprises a main machine and an attached drive module.

[0009] The main machine can be considered a fully functional unit in its own right and can operate independently, even without the attached drive module, performing its intended work function, such as compaction or milling. The main machine is therefore a fully functional construction machine in its own right, although it cannot be driven by a secondary drive unit of the attached drive module, as explained in more detail below. The secondary drive unit is not to be understood as hierarchically subordinate to the primary drive unit, but rather as an optional, fully functional drive unit that can be used to drive the main machine at will.The term "secondary drive unit" thus indicates that the secondary drive unit of the main machine, along with the primary drive unit (which is usually permanently installed and therefore not intended for regular removal), was added later by incorporating an add-on drive module, described in more detail below. The main machine may include a machine frame. This frame is the essential supporting structure of the construction machine. The machine frame can be a single piece. However, for articulated construction machines, it is also possible to design the machine frame in two parts: a front frame and a rear frame. In this case, the front and rear frames can be connected to each other via an articulated joint.

[0010] The main machine can include one or more drive units. These can be one or more roller drums, wheels, and / or tracked carriages. It may be provided that one or more of the drive units each have a hydraulic motor that drives a rotary motion of the respective drive unit.

[0011] The main machine may further comprise, in particular, a primary drive unit. The primary drive unit may be an internal combustion engine, in particular a diesel internal combustion engine. The primary drive unit may be designed in such a way as to provide the drive energy required for the travel and operation of the construction machine. In particular, it may be provided that the primary drive unit drives an output shaft forming an output of the primary drive unit, which can be used for driving one or more downstream units. This may, for example, be a power take-off (PTO) shaft. The output shaft may comprise a crankshaft.

[0012] The main machine may include a hydraulic system. In this context, the hydraulic system refers specifically to all components that store, move, and / or direct hydraulic fluid carried by the main machine. The main machine's hydraulic system may include one or more hydraulic fluid tanks, hydraulic fluid lines, hydraulic pumps, and hydraulic motors. It may also include other components, such as hydraulic fluid coolers and / or filters, and / or one or more valves.

[0013] Specifically, the hydraulic system of the main machine may be designed to have a first hydraulic circuit with a first hydraulic pump and a first hydraulic motor, and a second hydraulic circuit with a second hydraulic pump and a second hydraulic motor. The first and / or second hydraulic fluid circuits may be designed as open and / or closed hydraulic fluid circuits. Within each hydraulic fluid circuit, hydraulic fluid, pumped by the respective hydraulic pump, can drive the respective hydraulic motor. Hydraulic fluid pumped within each hydraulic circuit has no effect on the other hydraulic circuit. The first and second hydraulic circuits can therefore be functionally separated from each other with regard to the respective hydraulic motor driven and the functional components of the construction machine driven by it.be assigned individually and independently to the respective hydraulic pump and hydraulic motor.

[0014] However, it may be provided that the first hydraulic pump and the second hydraulic pump are drive-connected to each other via a coupling device and can be driven together by the primary drive unit via a primary drive train. The coupling device may, in particular, be designed such that the first and the second hydraulic pump are directly and, in particular, exclusively mechanically drive-connected to each other and / or are in a drive connection together with an output, in particular the output shaft, especially the power take-off shaft, of the primary drive unit.

[0015] It is also possible to have one or more distribution stages, such as a pump distribution gearbox, between the primary drive unit, the first hydraulic pump, and / or the second hydraulic pump. The first and second hydraulic pumps can also be configured in a tandem arrangement or as a tandem pump.

[0016] The construction machine according to the invention can, in addition to the main machine, which is already fully functional on its own and has a primary drive unit, have an add-on drive module, or such a module can be connected to the main machine and subsequently carried along by it. The add-on drive module can represent a hybridization unit, through which an external drive source in the form of the secondary drive unit is available to the main machine. This secondary drive unit can optionally be carried along by the main machine and enables an alternative drive for the main machine to the primary drive unit. The add-on drive module is thus a unit that can be handled separately from the main machine and can be optionally connected to and detached from the main machine. It is therefore an add-on or interchangeable unit.It is preferred that the add-on drive module, when connected to the main machine, is located outside the main machine's outer surface. The add-on drive module may include a secondary drive unit and a hydraulic pump driven by the secondary drive unit. The secondary drive unit, like the primary drive unit, is a device that provides the drive energy required for at least partial operation of the construction machine, either as a supplement to or alternative to the primary drive unit, as explained in more detail below. It is preferred that the secondary drive unit is not an internal combustion engine, but rather a different type of drive unit, particularly one that produces fewer emissions than an internal combustion engine.

[0017] It may be provided that a separable hydraulic connection interface exists between the main machine and the attachment drive module. The separable hydraulic connection interface thus refers in particular to an interface between the main machine and the attachment drive module, through which hydraulic fluid can flow from the attachment drive module to the main machine and, in particular, simultaneously in reverse, to maintain a hydraulic circuit. The hydraulic connection interface can therefore comprise at least two or more passages for hydraulic fluid. Furthermore, the assembly of the main machine and the attachment drive module, referred to here as construction machinery, can be designed in such a way that the attachment drive module is removable from the main machine.For this purpose, the hydraulic connection interface can be designed to be separable, for example, via one or more hose connections with one or more hose couplings or similar devices, in particular one or more self-closing hose couplings or similar devices, i.e., hose couplings that close automatically when one or more connected hose coupling sections are removed. "Separable" thus means, in particular, that a line connection is present that can be separated and reconnected without damage. The separable hydraulic connection interface can therefore, in particular, designate a transition area in which hydraulic fluid passes from the main machine to the attachment drive module and vice versa.

[0018] Ideally, a hybrid hydraulic circuit is maintained in the construction machine using the hydraulic connection interface. This can be achieved, for example, by connecting the attachment drive module to the first hydraulic circuit via a first line connection and a second line connection, both running through the separable hydraulic connection interface, to maintain a hybrid hydraulic circuit that extends at least partially through the attachment module's hydraulic pump and the first hydraulic fluid circuit, driving the first hydraulic pump and / or the first hydraulic motor. The hybrid hydraulic circuit can be defined as a hydraulic circuit that extends at least partially through the attachment module's hydraulic pump and the first hydraulic fluid circuit of the main machine. The hybrid hydraulic circuit runs...The hybrid hydraulic circuit thus extends partially on the side of the main machine and simultaneously partially on the side of the attachment drive module. When hydraulic fluid is moved within the hybrid hydraulic circuit, there is therefore always an exchange of hydraulic fluid between the attachment drive module and the main machine. It can be provided that the hybrid hydraulic circuit extends at least partially through the attachment module hydraulic pump, i.e., on the side of the attachment drive module, and the first hydraulic fluid circuit, i.e., on the side of the main machine. It can further be provided that the hybrid hydraulic circuit extends through the first hydraulic fluid circuit in such a way that the hydraulic fluid pumped by the attachment module hydraulic pump drives the first hydraulic pump and / or the first hydraulic motor of the first hydraulic circuit.This allows the first hydraulic motor and / or the first hydraulic pump to be driven not only by the primary drive unit of the main machine, but also, and especially alternatively, by the secondary drive unit of the add-on drive module. It can be specifically designed so that hydraulic fluid routed or pumped in the hybrid hydraulic circuit by the add-on module's hydraulic pump can exclusively drive one or more hydraulic pumps and / or one or more hydraulic motors of the first hydraulic circuit, and simultaneously cannot drive any hydraulic pump, hydraulic motor, and / or any other consumer of hydraulic drive energy in the second hydraulic circuit. The hybrid hydraulic circuit can thus be designed to be hydraulically separate from the second hydraulic circuit.As with the first hydraulic circuit of the main machine, the hybrid hydraulic circuit of the attachment drive module and the main machine can be designed to be hydraulically separated, in particular completely separate, from the second hydraulic circuit of the construction machine with regard to the transmitted hydraulic energy. For the actual exchange of hydraulic fluid or hydraulic drive energy between the attachment drive module and the main machine, it is possible for the attachment drive module, or its attachment module hydraulic pump, to be connected to the first hydraulic circuit via a first line connection running through the separable hydraulic connection interface and via a second line connection running through the separable hydraulic connection interface.The first and second line connections can therefore represent special line sections specifically designed for the exchange of hydraulic fluid between the add-on drive module and the main machine, and which, for example, are not needed and in particular do not need to be filled with hydraulic fluid if the first hydraulic pump is driven by the primary drive unit of the main machine instead of the secondary drive unit of the add-on drive module, especially also in the case of a main machine without an add-on drive module.

[0019] Because the add-on drive module is structurally a separate and external unit from the main machine, it is possible, for example, to supplement a conventionally powered main machine (driven by a combustion engine as the primary drive unit) with the add-on drive module to maintain the construction machine's functionality. This allows the resulting hybrid hydraulic circuit to drive one or more hydraulic motors and / or hydraulic pumps of the primary hydraulic circuit. This requires only the main machine to accommodate the add-on drive module and establish a hydraulic connection via the hydraulic interface. Conversely, by reversing these steps, the construction machine can be relatively easily disassembled into its separate units: the main machine and the add-on drive module.The add-on drive module can then be used, for example, on another main machine, and the original main machine can continue to be operated using the primary drive unit. The add-on drive module described above is therefore particularly suitable for retrofitting conventional main machines with a virtually permanently installed combustion engine as the primary drive unit, since the components essential for hybridization—specifically the secondary drive unit and the add-on module hydraulic pump driven by the secondary drive unit—can be provided externally via the add-on drive module.Furthermore, it is also possible to successively attach the single drive module to different main machines, thus enabling the operation of several main machines with sequential functions on a construction site using just one drive module. This single drive module is particularly lower in emissions compared to the primary drive unit. Therefore, a single drive module is sufficient for the comparatively lower-emission operation of various construction machines, eliminating the need to purchase a complete "hybrid fleet".

[0020] Furthermore, because the first and second hydraulic pumps can be interconnected via the coupling device, it is possible to indirectly drive the second hydraulic pump of the second hydraulic circuit via the secondary drive unit by driving the first hydraulic pump through the hybrid hydraulic circuit. This also allows the operation of the consumers driven by the hydraulic motor(s) of the second hydraulic circuit to be driven. This process involves a two-stage energy conversion. The hydraulic energy delivered in the hybrid hydraulic circuit is first converted into mechanical energy by the first hydraulic pump, ideally designed as a motor-pump unit (as described in more detail below). This mechanical energy is then transmitted, for example, via a shaft transmitting drive torque to the second hydraulic pump to drive it. In this case, the first hydraulic pump thus acts as a hydraulic motor.The second hydraulic pump, in this case mechanically driven by the first hydraulic pump, pumps hydraulic fluid in the second hydraulic circuit. This means that the mechanical energy received by the second hydraulic pump is converted back into hydraulic energy and made available as hydraulic energy in the second hydraulic circuit. Therefore, existing drive structures in the main machine can be used to drive the second hydraulic pump, eliminating the need for additional modifications within the main machine to drive the second hydraulic pump in the second hydraulic circuit, which is the desired hybridization of the construction machine achieved by adding the auxiliary drive module.

[0021] It is possible that the first hydraulic circuit is a, in particular a closed, drive hydraulic circuit, the first hydraulic pump is a drive hydraulic pump, and the first hydraulic motor is a drive hydraulic motor. In this case, the main machine thus comprises a drive hydraulic circuit that can be integrated, at least partially, into the hybrid hydraulic circuit via the hydraulic connection interface. The drive hydraulic circuit can also include two or more drive hydraulic motors, in particular arranged in parallel to each other within the first hydraulic system or first hydraulic circuit.

[0022] The second hydraulic circuit can be a vibration excitation hydraulic circuit, particularly a closed one; the second hydraulic pump can be a vibration excitation drive hydraulic pump; and the second hydraulic motor can be a vibration excitation drive hydraulic motor. Soil compaction machines can have one or more vibration excitation devices, for example, one or more unbalanced exciters, for carrying out dynamic compaction processes. These devices are particularly associated with the drive units designed as roller drums. The vibration excitation hydraulic circuit can also have two or more vibration excitation drive hydraulic motors, particularly arranged in series and / or parallel with each other in the second hydraulic system.

[0023] In addition to the first and second hydraulic circuits, the main machine may also have one or more further hydraulic circuits, each of which may include one or more hydraulic motors and / or hydraulic actuators and one or more hydraulic pumps. At least one of the hydraulic pumps of each of these further hydraulic circuits may be connected to the first and / or second hydraulic pump of the first and / or second hydraulic circuit via the coupling device and / or one or more further coupling devices and thus be driven indirectly by the secondary drive unit of the add-on drive module, as described above, with multiple, in particular two, energy conversions.

[0024] Regarding the specific design of the coupling device between the first and second hydraulic pumps, various preferred embodiments can be employed. For example, the coupling device can be designed as a direct mechanical torque transmission connection between the first and second hydraulic pumps. This can be, for instance, a connecting shaft, particularly within a tandem pump arrangement of the first and second hydraulic pumps. The mechanical torque transmission connection can additionally or alternatively be gearless and / or, in particular, have a 1:1 gear ratio from the first to the second hydraulic pump. Furthermore, additionally or alternatively, the coupling device can also be designed as a shaft extending between the first and second hydraulic pumps.The coupling device is designed as a shaft drive extending from the first hydraulic pump and passing through the second hydraulic pump. Additionally or alternatively, a pump distribution gearbox may also be provided for the mechanical transmission connection of two or more hydraulic pumps. The aforementioned preferred and exemplary embodiments of the coupling device may also be provided in this manner, either additionally or alternatively, for driving one or more hydraulic pumps of one or more further hydraulic circuits of the main machine and may be enclosed by the main machine.

[0025] The main machine may have one or more coupling devices, particularly in the area of ​​mechanical drive trains between the first hydraulic pump and the second hydraulic pump and / or between one or more hydraulic pumps of one or more further hydraulic circuits. The coupling device(s) may be designed, in particular, as a switching clutch to selectively activate or deactivate torque transmission between the respective hydraulic pumps.

[0026] The main machine may be provided with a receiving device designed for the detachable attachment of a soil cultivation unit. In this context, a receiving device refers in particular to a device designed for the at least partially positive-locking and non-destructively detachable receiving and / or storage of the soil cultivation unit. The receiving device may have a suitable receiving element, for example, a hook-shaped receiving element. A counter-element may be provided on the soil cultivation unit(s) designed for positive engagement with the receiving element of the main machine. The soil cultivation unit may, for example, be a grit spreader or a vibratory plate compactor.Ideally, the drive module is mounted on the main machine of the construction equipment via this mounting device, instead of the respective tillage unit. This eliminates the need for an additional mounting device on the main machine, further reducing the required conversion effort for the main machine. Specifically, the mounting device could be, for example, a bearing fork encompassed by the main machine, particularly one adjustable relative to the main machine's frame. More specifically, it could comprise two bearing or mounting arms spaced horizontally and transversely to the working or forward direction of the construction equipment, and / or extending at least partially horizontally and in and / or against the forward direction beyond the front or rear outer surface of the rest of the main machine.

[0027] To facilitate the attachment of the drive module to the main machine, the mounting device can be adjustable between a receiving position and an operating position. The receiving position can be designed, in particular, to accommodate the drive module resting on the ground. The operating position, on the other hand, is ideally designed such that the drive module, held by the mounting device, is raised above the ground and can thus be carried by the main machine without contact with the ground. The mounting device can therefore be adjustable relative to the rest of the main machine, at least partially, in the vertical direction between the receiving position and the operating position, or be height-adjustable.The receiving device can be pivotably mounted on the rest of the main machine between the receiving position and the operating position, particularly about a horizontal pivot axis.

[0028] Additionally or alternatively, the main machine may also include a drive unit designed to drive the adjustment movement of the receiving device between the operating position and the receiving position. This may, in particular, be one or more linear actuators, especially hydraulic cylinders.

[0029] Additionally or alternatively, the main machine may include a locking device designed to secure the receiving device in the operating position and / or the receiving position. This could be, for example, a locking bolt or similar device.

[0030] Additionally or alternatively, the add-on drive module may also have an adjustable mounting device. This device can be adjustable and / or lockable, particularly between a mounting position and an operating position, especially when driven, as described above for the main machine.

[0031] The secondary drive unit of the add-on drive module can, in particular, consist of an electrical energy storage device and an electric motor driven by electrical energy from the electrical energy storage device. The electric motor is designed to drive, in particular directly drive, the add-on module's hydraulic pump. The electrical energy storage device can, in particular, be a rechargeable electrical energy storage device, especially one or more batteries.

[0032] The add-on drive module preferably comprises a support frame which, particularly independently of the main machine frame, can form, for example, the essential support structure of the add-on drive module. It is advantageous if the secondary drive unit, the electrical energy storage device, and the add-on module hydraulic pump are mounted on this support frame. It can be provided that the counter-structure is formed directly by the support frame or at least directly connected to it.

[0033] To further reduce the effort, particularly for the operational connection of the attachment drive module to the main machine, it is advantageous if the detachable hydraulic connection interface includes a connection valve assembly integrated with the main machine. Ideally, the connection valves included in the connection valve assembly can be adjusted, or be adjustable, at least between an open and a closed position. The connection valve assembly can be part of a valve block. The connection valve assembly can include connection openings, particularly for the connection valves, which are positioned in the outer surface of the construction machine, especially at the rear and / or front and / or top of the machine, or within the outer surface of the construction machine at a location that is relatively easily accessible from outside the machine, for example, behind a maintenance hatch or similar.

[0034] Ideally, the part of the hydraulic connection interface, in particular the connection valve assembly, should be located on the side of the main machine facing the attachment drive module and / or on a side of the main machine directly adjacent to the attachment drive module, in order to keep hydraulic lines between the main machine and the attachment drive module as short as possible.

[0035] The separable hydraulic connection interface can comprise an inlet or supply port on the main machine side, particularly as part of the first line connection, and a return port, particularly as part of the second line connection. These can be part of the connection valve assembly and / or the valve block. The add-on drive module can comprise an inlet line connectable to the supply port and a return line connectable to the return port, the inlet line and the return line being fluidly connected to each other via the add-on module hydraulic pump on the add-on drive module side. In this way, it is particularly possible to design the hybrid hydraulic circuit as a whole as a closed hydraulic circuit, which runs partly in the add-on drive module and partly in the main machine.

[0036] There are various possibilities regarding the specific arrangement of the first hydraulic pump and the first hydraulic motor in the hybrid hydraulic circuit, as well as regarding the positioning of an inlet and outlet point for hydraulic fluid circulating in and out of the first hydraulic circuit. It is advantageous if the hybrid hydraulic circuit is designed such that the first hydraulic pump and the first hydraulic motor, particularly on the side of the main machine, are connected in parallel within the hybrid hydraulic circuit.This can, in particular, lead to a reversal of the hydraulic fluid flow direction in a section of the first hydraulic circuit when the hydraulic fluid is supplied by the add-on module hydraulic pump driven by the secondary drive unit, compared to when the hydraulic fluid is supplied by the first hydraulic pump driven by the primary drive unit of the main machine. In other words, the hydraulic fluid flow in the first hydraulic circuit, which is normally delivered by the first hydraulic pump, can be changed to a fluid flow within the first hydraulic circuit via two or more parallel lines when the hydraulic fluid is supplied by the add-on module hydraulic pump. This involves the injection and discharge of hydraulic fluid into the first hydraulic circuit via, for example, the injection and discharge points.

[0037] In principle, it is possible for the first hydraulic circuit to include, in addition to the first hydraulic motor, at least one further hydraulic motor, which is also in a fluid-conducting connection with the first hydraulic pump. The first hydraulic motor and the at least one further hydraulic motor of the first hydraulic circuit can be arranged in series, but preferably in parallel to each other within the first hydraulic fluid circuit. It can also be provided, additionally or alternatively, that the hybrid hydraulic circuit is designed such that the first hydraulic motor and / or the at least one further hydraulic motor and the first hydraulic pump are connected in parallel to each other, and thus are not sequentially traversed by hydraulic fluid circulating in the hybrid hydraulic circuit.

[0038] It is also possible to design the hybrid hydraulic circuit in such a way that the first hydraulic motor and the at least one further hydraulic motor are arranged in parallel to each other, and the first hydraulic pump is arranged in series with the first hydraulic motor and / or with the at least one further hydraulic motor.

[0039] To further expand the functional range of the hybrid hydraulic circuit, it is particularly possible to design the first and / or second hydraulic pump and / or the auxiliary hydraulic pump as variable displacement hydraulic pumps. A variable displacement hydraulic pump is characterized by its variable displacement, meaning the volume of hydraulic fluid it delivers per revolution is variable. Ideally, one or more of these variable displacement hydraulic pumps should be designed to be adjustable from a maximum displacement down to zero displacement. At zero displacement, the hydraulic pump is still driven, but its displacement is reduced to zero, so that despite being driven, no hydraulic fluid is delivered by the pump.Conversely, the hydraulic pump set to zero flow volume can also be used, particularly when the hybrid hydraulic circuit is operated and the hydraulic pump is then operated as a hydraulic motor, to block one or more pipe sections of the first hydraulic circuit and / or to prevent torque transmission from the first hydraulic pump to the second hydraulic pump via the coupling device.

[0040] It is particularly advantageous if the first and / or the second hydraulic pump and / or the auxiliary hydraulic pump are designed as a pump-motor unit. A hydraulic pump designed as a pump-motor unit can be operated either as a hydraulic pump or as a hydraulic motor in a hydraulic circuit. In this way, for example, the first hydraulic pump designed as a pump-motor unit can be used particularly well to drive the second hydraulic pump via the coupling device in the operation of the hybrid hydraulic circuit.Additionally or alternatively, the attached hydraulic pump, designed as a pump-motor unit, can be used to operate the hybrid hydraulic circuit in generator mode to charge the electrical energy storage of the attached drive module. In this case, the electric motor of the attached drive module, operating as a generator, is driven by the attached hydraulic pump, which in this case acts as the hydraulic motor driving the generator. In this operating mode, the first hydraulic pump is driven directly, while the attached hydraulic pump, acting as a hydraulic motor, is driven indirectly via the hybrid hydraulic circuit through the primary drive unit of the main machine.

[0041] The construction machine, in particular the main machine, may include a control unit designed for, in particular at least partial, control of the first and / or second hydraulic pump and / or the auxiliary hydraulic pump. Specifically, the control unit may be designed to adjust and / or regulate one or more flow rates of the first and / or second hydraulic pump and / or auxiliary hydraulic pump, which in this case are ideally designed as variable displacement hydraulic pumps. For this purpose, the control unit may be connected to the first and / or second hydraulic pump and / or the auxiliary hydraulic pump via one or more suitable wireless and / or wired control signal transmission lines.

[0042] The construction machine can have one or more sensors connected to the control unit via one or more suitable wireless and / or wired sensor signal transmission lines. Using one or more of these sensors, various operating and / or condition parameters relevant to the operation of the construction machine can be recorded and transmitted to the control unit for controlling and / or regulating the adjustment positions or flow rates of the first and / or second hydraulic pump and / or auxiliary hydraulic pump, which may be configured as a variable displacement hydraulic pump and / or motor-pump unit.Such sensors can be, for example, a charge level sensor for determining the current charge level of the electrical energy storage of the add-on drive module and / or one or more speed sensors of the primary drive unit and / or the secondary drive unit and / or one or more of the hydraulic motors, in particular the first hydraulic motor and / or the second hydraulic motor and / or one or more of the at least one further hydraulic motor(s), one or more flow sensors and / or one or more pressure sensors for determining one or more hydraulic pressures within the first hydraulic circuit and / or the second hydraulic circuit and / or the hybrid hydraulic circuit, etc.

[0043] The aforementioned control unit is preferably integrated into the main machine. However, it may additionally or alternatively be provided that the add-on drive module has a module control unit that communicates with the control unit, particularly the main machine, via a signal transmission connection, for example, wirelessly and / or via cable, and exchanges control commands and / or sensor data with it. The module control unit can be specifically designed to control the charging process of the electrical energy storage device during generator operation. During normal operation of the construction machine, it is preferred that the driving and operational control is hierarchically superior to the module control unit and is handled by the control unit.However, it may be provided that the control unit includes a hierarchy change module, which is designed in such a way that the hierarchy order changes when the construction machine is operated in the generator mode already described above, and the module control unit is hierarchically superior to the control unit of the main machine.

[0044] A primary drive coupling may be present between the first and / or second hydraulic pump and the primary drive unit. In a disengaged state, this coupling disconnects torque transmission in the primary drive train from the primary drive unit to the first and / or second hydraulic pump. The primary drive coupling can thus be designed as a position-adjustable coupling, or as a switching coupling, between an engaged, torque-transmitting position and a disengaged, non-torque-transmitting position, for example, as a friction or jaw coupling or similar. This makes it possible to disengage the primary drive unit from the primary drive train during operation of the hybrid hydraulic circuit or when driving the construction machine via the secondary unit of the attachment drive module, so that it does not have to be dragged along during this operating phase.This can increase the efficiency of the construction machine's drive via the secondary drive unit.

[0045] Another aspect of the invention relates to a method for retrofitting a construction machine, in particular a construction machine according to the invention, as described above. In this respect, details of the construction machine according to the invention are hereby expressly and optionally referenced in connection with the method according to the invention.

[0046] The construction machine to which the method relates comprises a main machine with a primary drive unit, in particular an internal combustion engine, and a hydraulic system. The hydraulic system has a first hydraulic circuit with a first hydraulic pump and a first hydraulic motor. The hydraulic system of the main machine may also include a second hydraulic circuit with a second hydraulic pump and a second hydraulic motor. The first hydraulic pump and the second hydraulic pump can be connected to each other via a coupling device, in particular directly mechanically, and can be driven together by the primary drive unit via a primary drive train. For further possible features of the main machine, reference is made to the preceding descriptions of the main machine of the construction machine according to the invention.

[0047] For the method according to the invention, it is now provided in step a) that an add-on drive module is picked up, specifically that the add-on drive module is picked up by the main machine. In other words, in this step the add-on drive module is connected to the main machine in such a way that, after being picked up, the main machine carries the add-on drive module along during travel. With regard to further possible features of the add-on drive mode, reference is made to the preceding information on the add-on drive module of the construction machine according to the invention.

[0048] The method according to the invention further comprises, in step b), the creation of fluid-conducting connections, in particular via a first pipe connection and via a second pipe connection with the first hydraulic circuit, between the add-on drive module and the main machine, such that a hybrid hydraulic circuit is obtained which extends or runs at least partially through an add-on module hydraulic pump of the add-on drive module and the first hydraulic fluid circuit and drives the first hydraulic pump and / or the first hydraulic motor. By integrating the add-on drive module into the main machine, and thus by creating the construction machine as a whole consisting of the main machine and the add-on drive module, an additional hybrid hydraulic circuit is obtained compared to the isolated main machine, which extends beyond the main machine and also through the add-on drive module.The hybrid hydraulic circuit also partially runs through at least parts of the first hydraulic circuit of the main machine. Regarding further possible features of the construction machine, reference is made to the preceding information on the construction machine according to the invention.

[0049] In step c), it is now provided that the attachment module's hydraulic pump is driven by a secondary drive unit encompassed by the attachment drive module, thereby pumping hydraulic fluid in the hybrid hydraulic circuit to drive the first hydraulic pump and / or the first hydraulic motor of the first hydraulic circuit. In this case, the drive source responsible for pumping hydraulic fluid through at least parts of the first hydraulic circuit is thus no longer solely provided by the primary drive unit of the main machine, but at least additionally, and in particular exclusively, by the secondary drive unit of the attachment drive module. Ideally, the pumping of hydraulic fluid in at least parts of the first hydraulic circuit is based exclusively on drive energy generated by the secondary drive unit, and the primary drive unit is, for example, deactivated.It is particularly preferred if, in step c), the drive energy required for operating the hydraulic units of the construction machine necessary for driving and / or working is generated exclusively by the secondary drive unit, and the primary drive unit is completely deactivated or in a state in which it does not generate any drive energy. It can also be decoupled from a primary drive train via a clutch in a disengaged position.

[0050] Ideally, in step c), the hydraulic pump of the add-on module is driven electrically by an electric motor on the side of the add-on drive module. Electric motors have the advantage over combustion engines that they can be operated virtually emission-free, in this case, in particular, by drawing electrical energy from an electrical energy storage device of the add-on drive module. In this case, the method according to the invention thus enables a comparatively simple and, above all, rapid change of the drive source from the primary drive unit to the secondary drive unit by integrating and connecting the add-on drive module to the main machine. This allows, for example, a change from a combustion engine drive (if the primary drive unit is a combustion engine) to an electric motor drive (if the secondary drive unit is an electric motor).

[0051] The add-on drive module is thus designed as a self-contained, manageable unit, for example, comprising its own support frame. In practical use of the main machine or construction machine, it can be advantageous to minimize the equipment required to convert the main machine into the complete unit consisting of the main machine and the add-on drive module. It is therefore also preferred if the main machine does not require an additional lifting vehicle, such as a forklift or crane, to accommodate the add-on drive module. To enable this, it can be provided that the add-on drive module is picked up by the main machine using a receiving device, in particular the main machine, that is adjustable between a receiving position and an operating position.The pickup position refers specifically to a position of the pickup device in which it mechanically contacts the add-on drive module resting on the ground and from which it can lift the add-on drive module resting on the ground. The operating position, on the other hand, refers, for example, to a position of the pickup device in which the add-on drive module it holds is held against the ground on the main machine and can be carried along by the machine during operation. Adjusting the pickup device between the pickup position and the operating position can, for example, involve a linear and / or curved relative movement of the pickup device with respect to the machine frame of the main machine, and thus a shifting and / or pivoting of the pickup device relative to the machine frame of the main machine.The adjustment of the receiving device can also be driven by a drive device, for example by means of a linear actuator, in particular a hydraulic cylinder.

[0052] Preferably, in step a) the receiving device is first moved into the receiving position to receive the add-on drive module and then into the operating position together with the add-on drive module, wherein the movement from the receiving position to the operating position particularly includes lifting and / or pivoting the add-on drive module. In this way, for example, it is possible for the main machine to first move itself into a position to receive the add-on drive module relative to the add-on drive module and then to lift it itself.

[0053] Additionally or alternatively, it is also possible that the add-on operating module comprises a receiving device adjustable between a receiving position and an operating position by means of a receiving device, and that the main machine has a counter-form designed to support the receiving device. In this case, in step a), preferably when the main machine with its counter-form is in a suitable relative position to the receiving device of the add-on operating module, the receiving device is first adjusted to the receiving position on or side of the add-on operating module and then adjusted to the operating position on or side of the add-on operating module, wherein in this case the add-on operating module preferably drives itself to lift and / or pivot upwards relative to the main machine.

[0054] The operation of the components within the hybrid hydraulic circuit can also vary. For example, in step c), it may be provided that parallel driving of at least two or more components within the hybrid hydraulic circuit is carried out simultaneously by hydraulic fluid supplied by the add-on module hydraulic pump. Specifically, it is possible, for instance, that the first hydraulic pump, particularly as a pump-motor unit, and / or the first hydraulic motor, and / or at least one further hydraulic motor, are driven or supplied with hydraulic energy by the add-on module hydraulic pump within the hybrid hydraulic circuit.In particular, for the first hydraulic pump, which is preferably designed as a pump-motor unit, this can also mean a reversal of the torque transmission direction compared to a drive by the primary drive unit, or a reversal of the function of the first hydraulic pump from a pump function when driven by the primary drive unit to a motor function when driven by the secondary drive unit.

[0055] This can mean, in particular, that in step c), a coupling device can be used to drive at least the second hydraulic pump in the second hydraulic circuit by means of a torque transmission, preferably direct and / or exclusively mechanical, via the coupling device between the first hydraulic pump and the second hydraulic pump. In other words, it can be provided that the first hydraulic pump in the hybrid hydraulic circuit functionally acts as a motor for the second hydraulic pump of the second hydraulic circuit on the side of the main machine. Overall, the second hydraulic pump is then no longer driven by the primary drive unit, but indirectly by the secondary drive unit.However, the second hydraulic circuit and the functional components integrated within it, such as the second hydraulic pump and the second hydraulic motor, remain fully and, in particular, unchanged operational thanks to the coupling device, preferably both in drive operation by the primary drive unit of the main machine and in drive operation by the secondary drive unit of the attachment drive module.

[0056] It can therefore also be provided in particular that the method according to the invention relates to a first hydraulic circuit designed as a drive hydraulic circuit and a second hydraulic circuit designed as a working function circuit, in particular a hydraulic circuit for driving one or more vibration exciters, or that the construction machine is designed in this way.

[0057] Ideally, the add-on module hydraulic pump and / or the first hydraulic pump (especially if designed as a pump-motor unit) and / or the second hydraulic pump should be designed as variable displacement hydraulic pumps. Variable displacement hydraulic pumps are characterized by the fact that their displacement volume is controllable and / or adjustable, particularly by means of a control unit. Based on this, it can now be provided that in step c) one or more operating parameters of the add-on module hydraulic pump and / or the first hydraulic pump are controlled, particularly by the control unit. Such an operating parameter could, for example, be the current displacement volume and / or the current speed of the add-on module hydraulic pump and / or the first hydraulic pump and / or the second hydraulic pump.

[0058] The secondary drive unit is preferably an electric motor. The electric motor can, in particular, be connected to an electrical energy storage device of the add-on drive module for the transmission of electrical energy. For this arrangement, it can be provided that, in generator mode, the hybrid hydraulic circuit drives the add-on hydraulic pump, designed as a motor-pump unit, to charge the energy storage device of the add-on drive module. The drive energy required for this can be generated via the primary drive unit of the main machine. Thus, the primary drive train between the primary drive unit and the first hydraulic pump can drive the flow of hydraulic fluid in the hybrid hydraulic circuit, thereby driving the add-on module hydraulic pump, which in this case acts as a motor.This can then, for example via a coupling device, drive the electric motor of the add-on drive module (which in this case acts as a generator) to produce electrical energy. The electrical energy generated can be stored in the add-on drive module's electrical energy storage system. The construction machine is thus able to recharge its own electrical energy storage.

[0059] The construction machine and / or method described above are characterized by the fact that, if any modifications are required at all to accommodate the add-on drive module and to commission the secondary drive for powering the construction machine, only minimal interventions in the hydraulic architecture of the main machine are necessary. The construction machine and / or method according to the invention are therefore particularly suitable for retrofitting a construction machine or a main machine with an add-on drive module, and thus for converting a conventional construction machine with only one combustion engine as the primary drive unit into a hybrid construction machine that can alternatively obtain the drive energy required for propulsion from the secondary drive unit. The method according to the invention can therefore also be used, in particular, as a method for retrofitting a construction machine or a main machine with an add-on drive module.The main machine is further developed with an attached drive module, in particular a road construction machine, especially a tandem roller, ideally to obtain a construction machine according to the invention.

[0060] The starting point of this process can initially be the main machine with a soil cultivation unit designed to be detachable from the main machine. The soil cultivation unit could, for example, be a vibratory plate compactor or a grit spreader. Starting with such a main machine and soil cultivation unit, it can be provided that, prior to step a), the soil cultivation unit is removed from the main machine, for example, by adjusting a receiving device as described above from its operating position to the receiving position for setting down the soil cultivation unit. In step a), the attached drive module is then picked up and stored using the receiving device's bearings, on which the soil cultivation unit was previously mounted.In this way, the interchangeable connection of the tillage unit and the drive module is achieved via the same bearings on the main machine. While this may mean that simultaneous mounting of both the tillage unit and the drive module is not possible, this potential disadvantage is outweighed by the minimal conversion effort required and the alternative drive option provided by the drive module.

[0061] It may be necessary for control data to be exchanged between a control unit of the construction machine and a module control unit of the attachment drive module during operation. For this purpose, one or more signal transmission links between the main machine and the attachment drive module may be provided. These links can be wireless and / or wired, for example. Additionally or alternatively, it is also possible for the main machine and the attachment drive module to identify and / or authorize each other unilaterally and / or mutually. This can be achieved, for example, by exchanging suitable authorization codes and / or similar means.

[0062] The invention is explained in more detail below with reference to the embodiments shown in the figures. The figures schematically show: Fig. 1 a side view of a main machine with a soil cultivation unit; Fig. 2 a side view of a construction machine with a main machine and an attached drive unit; Fig. 3 a schematic view of a drive system of a construction machine in a first embodiment; Fig. 4 a schematic view of a drive system of a construction machine in a second embodiment; Fig. 5 an operating state of a drive system of a construction machine in a drive state when driven via a primary drive unit; Fig. 6 an operating state of a drive system of a construction machine in a drive state when driven via a secondary drive unit; Fig. 7 an operating state of a drive system of a construction machine in an extended drive state when driven via a secondary drive unit; Fig. 8 a drive system of a construction machine in a generator operating state; Fig. 9 a flowchart of a method according to the invention; and Fig. 10. Schematic diagram illustrating the functionality of the control unit.

[0063] Identical or similarly functioning components are designated with the same reference numerals in the figures. Repeating components are not necessarily designated separately in each figure.

[0064] Fig. Figure 1 shows a construction machine 1 with a main machine 2 and a soil cultivation unit 3, for example a grit spreader, carried by the main machine 2. The main machine 2 can have a machine frame 4, drive mechanisms 5 and a primary drive unit 6. The machine frame 4 can form a significant supporting structure of the main machine 2 and can, for example, be manufactured in one piece, as in the embodiments according to the Fig. 1 and Fig. 2, or also as an articulated machine frame in two parts with a front frame and a rear frame connected to it via an articulated joint. The driving devices 5 can be wheels and / or track drives, but in particular rolling drums, as in the Fig. 1 and Fig. 2 shown as an example. The main machine 2 can be specifically designed as a self-propelled tandem roller.

[0065] The primary drive unit 6, encompassed by the main machine 2, can be, for example, an internal combustion engine, in particular a diesel engine. The primary drive unit 6 can be designed to generate the drive energy required for the operation of the main machine 2, for example, for the drive system and the drive of one or more auxiliary devices, such as one or more vibration exciters, etc. The main machine 2, on its own and especially even without the soil cultivation unit 3, constitutes a fully functional, in particular self-propelled, working machine.

[0066] The soil cultivation unit 3 can be mounted on the main machine 2 via a mounting device 7. The mounting device 7 can be positioned between one mounting position (in the Fig. 1 and Fig. 2 (shown as dashed lines) and an operating position (in the Fig. 1 and Fig. The tillage unit 3 (shown with a solid line) can be adjusted. It is possible to attach the tillage unit 3 to the main machine 2 via the mounting device 7. One or more interacting positive locking devices can be provided between the mounting device 7 and the tillage unit. In the mounting position, the main machine 2 can thus automatically pick up the tillage unit 3, which is resting on, for example, the ground, raise it into the operating position by adjusting it, and carry it along in the operating position. In the dashed line diagram, the tillage unit 3 is resting on the ground, and in the diagram with a solid line, it is raised so that it can be carried along by the main machine 2.

[0067] Further elements of the main machine 2 can be an operator's workstation, in particular designed as a driver's cab or operator's cabin 8, and a control unit 9, in particular a machine control unit. The control unit 9 can, for example, receive operating inputs from an operator and / or from one or more sensors and transmit control commands to one or more motor and / or pump units as well as to the primary drive unit 6. The main machine 2 can also include a hydraulic system 11 with a first hydraulic circuit 12 and a second hydraulic circuit 13. The first hydraulic circuit 12 can, for example, be a travel drive hydraulic circuit. The second hydraulic circuit 13 can, for example, be a working fluid hydraulic circuit, in particular a vibration exciter drive hydraulic circuit. The main machine 2 can also include further hydraulic circuits. Each of the two hydraulic circuits has a [missing information - likely a specific component or component] in the Fig. 1 hydraulic pump (not shown in detail) assigned to the primary drive unit, which is driven or can be driven directly or indirectly by the primary drive unit.

[0068] Starting from construction machine 1 in the Fig. For example, it is possible for the main machine 2 to detach (dashed line) the soil cultivation unit 3 and separate from it. At the resulting free mounting point on the mounting device 7, it can now pick up an attachment drive module 10 instead of the soil cultivation implement 3. In particular, it can be provided that the main machine 2 itself lifts the drive attachment module 10, which is standing on the ground with the mounting device 7 in the picking position, into the operating position by adjusting it, and then carries the attachment drive module 10 along. The entire assembly consisting of the attachment drive module 10 and the main machine 2 is referred to here as "construction machine 1", whereby the main machine 2 alone is also a fully functional construction machine in terms of its range of functions and applications.Alternatively or additionally, the drive module 10 obviously does not have to be located on the main machine 1 at a point where a tillage unit or similar attachment was previously located. A separate or independent mounting point can also be provided for this purpose.

[0069] Fig. Figure 2 illustrates a construction machine 1 comprising the main machine 2 and the attached drive module 10. The attached drive module 10 can be connected to the main machine 2 via the receiving device 7. In the dashed line representation, the attached drive module 10 is placed on the ground, and in the solid line representation, it is raised so that it can be carried by the main machine 2.

[0070] The add-on drive module 10 can include a secondary drive unit 14. This can, for example, comprise an electric motor 15 and an electrical energy storage device 16. The add-on drive unit 10 can also include an add-on module hydraulic pump 17, which will be described in more detail below. Furthermore, the add-on drive module 10 can include a support frame 35, which can form the support structure of the add-on drive module 10, particularly independently of the machine frame 4 of the main machine 2. The add-on module hydraulic pump 17 of the add-on drive module 10 can pump hydraulic fluid for drive purposes in a hybrid hydraulic circuit, which extends through the add-on drive module and the main machine and will be described in more detail below.In this way, drive energy generated by the secondary drive unit 14 can be used to power the first and / or second hydraulic circuit, and at least parts thereof, instead of drive energy generated by the primary drive unit 6. For this purpose, a line assembly 18 can be provided between the add-on drive module 10 and the main machine 2, comprising a first line connection 19 (described in more detail below) and a second line connection 20. Since the add-on drive module 10 is designed to be attached to and detached from the main machine 2, a hydraulic connection interface 21 can be provided in the line assembly 18, or the hybrid hydraulic circuit can extend through the hydraulic connection interface 21.In this case, the hydraulic connection interface 21 thus represents a separation point in the hybrid hydraulic circuit, at which the hybrid hydraulic circuit is separated when the attachment drive module 10 is removed from the main machine 2, or at which the hybrid hydraulic circuit between the main machine 2 and the attachment drive module is closed when the attachment drive module 10 is connected to the main machine 2.

[0071] The add-on drive module 10 may also include a module control unit 22. The module control unit 22 may be configured to control one or more of the components of the add-on drive module 10, in particular the electric motor 15 and / or the electrical energy storage device 16 and / or the secondary drive unit 14 and / or the add-on module hydraulic pump 17. The add-on drive module 10 may include a communication device 23, which communicates with a communication device 25 of the main machine 2 via a signal transmission link 24. The signal transmission link 24 may be wired and / or wireless. Control and / or sensor data, for example, can thus be exchanged between the main machine 2 and the add-on drive module 10 using the signal transmission link 24.

[0072] Fig. Section 3 discloses further details of a possible design of the hydraulic system of construction machine 1, in particular construction machine 1 of the Fig. 2. The first hydraulic circuit 12 comprises a first hydraulic pump 26 and a first hydraulic motor 27. The second hydraulic circuit 13 comprises a second hydraulic pump 28 (or at least one hydraulic pump) and a second hydraulic motor 29 (or at least one hydraulic motor).

[0073] It is possible that the main machine 2 includes, in addition to the first hydraulic circuit 12 and the second hydraulic circuit 13, one or more further hydraulic circuits 30, each of which may have one or more hydraulic pumps 31 and / or hydraulic motors 32.

[0074] For clarity, the second hydraulic circuit 13 and at least one further hydraulic circuit 30 are shown in the Fig. Figure 3 (and also the following figures) only shows parts, specifically the respective pump and motor. These can be designed identically or similarly to the first hydraulic circuit 12. They can be designed as open and / or closed hydraulic circuits.

[0075] Additionally or alternatively, it may also be provided that each hydraulic circuit includes two or more hydraulic motors, particularly in a parallel connection. This is the case for the first hydraulic circuit according to... Fig. 3 For example, it is possible that in addition to the first hydraulic motor 27, it also has another hydraulic motor 33.

[0076] The main machine 2 can have a primary drive train 34 extending from the primary drive unit 8, for example, an output shaft designed as an output of the primary drive unit 8, in particular a power take-off shaft, via which one or more of the hydraulic pumps 26, 28 and / or 31 can be driven. In particular, it can be provided that at least the first hydraulic pump 26 and the second hydraulic pump 28 are drive-connected to each other via a coupling device 36, in particular directly mechanically, for example via a connecting drive shaft, a through-drive shaft or the like. Drive-connected means that one hydraulic pump can transmit drive energy to the other hydraulic pump, in particular directly mechanically, and vice versa. This can be achieved, for example, by a tandem arrangement of the first hydraulic pump 26 and the second hydraulic pump 28.Furthermore, one or more additional hydraulic pumps 31 may be provided, which are also directly connected to the first and / or the second hydraulic pump 26 / 28. It is possible that the first hydraulic pump 26 and / or the second hydraulic pump 28 and / or the one or more additional hydraulic pumps 31 are directly mechanically driven via the primary drive train or are connected to it if the first hydraulic pump 26, the second hydraulic pump 28 and / or the one or more additional hydraulic pumps 31 are driven by the primary drive unit of the main machine 2.

[0077] The one in Fig. The drive system shown in Figure 3 also allows at least part of the first hydraulic circuit 12 to be driven by the secondary drive unit 14 of the attachment drive module 10, particularly independently of the primary drive unit 8. For this purpose, a hybrid hydraulic circuit 37 can be included by the construction machine 1 and extend both via the attachment drive module 10 and via the main machine 2 of the construction machine 1. In contrast to the drive of the hydraulic circuits 12, 13 and / or 30 via the primary drive unit, where hydraulic fluid is moved exclusively on the side of the main machine 2, when the hydraulic circuits 12, 13 and / or 30, in particular the first hydraulic circuit 12, are driven via the secondary drive unit, an exchange of hydraulic fluid takes place between the attachment drive module 20 and the main machine 2.

[0078] In the Fig. In the embodiment shown in Figure 3, the hydraulic pump 17 of the drive module 10 can be connected to the first hydraulic circuit 12 via the first line connection 19 and the second line connection 20 of the line assembly 18. For this purpose, the line connections 19 and 20 can extend through the hydraulic connection interface 21 and, for example, have an inlet port 38 and a return port 39. An inlet line 40 can be provided within the main machine 2, connecting the first hydraulic circuit 12 to the inlet port 38 via a suitable feed point, for example, in the form of a valve not shown in detail in the figures. A return line 41 can also be provided, connecting the first hydraulic circuit 12 to the return port 39.The terms "inlet" and "return" refer to the direction of movement of the hydraulic fluid from the main machine 2 to the attachment drive module 10 or away from it. It is understood that these directions can obviously change during the operation of the construction machine 1.

[0079] With the aid of the hybrid hydraulic circuit 37, it is possible to use fluid supplied by the secondary drive unit 16 via the add-on module hydraulic pump 17 to drive one or more of the hydraulic motors 27 and / or 33 of the first hydraulic circuit on the side of the main machine 2. It may also be possible, additionally or alternatively, to drive the first hydraulic pump 26, designed as a motor-pump unit as described in more detail below, via the fluid supplied by the add-on module hydraulic pump 17, and thereby indirectly drive, via the coupling device 36, the second hydraulic pump 28 of the second hydraulic circuit 13 and / or the hydraulic pumps 31 of the other hydraulic circuit(s) 30, using the secondary drive unit 16 as the primary drive source. This will be explained in more detail in the following figures.

[0080] Part of the main machine 2 can also be an auxiliary consumer 42 driven, for example, via a power take-off of the primary drive unit 8, such as a feed pump and / or similar device. Such a feed pump can, for example, be designed to supply hydraulic fluid to one or more closed hydraulic circuits, in particular to compensate for leakage losses and / or for cooling purposes, which is described in the Fig. However, for the sake of clarity, number 3 is not shown.

[0081] Fig. 4 illustrates this in comparison to Fig. 3 alternative embodiments provide further details on a possible design of the hydraulic system of construction machine 1, in particular construction machine 1 of the Fig. 2, whereby the existing differences are essentially discussed below, and otherwise the explanations of the exemplary embodiment according to the Fig. 3. Reference is made to this.

[0082] Differences exist in the design of the primary drive train 34. This can include a coupling device 43 and a distribution device 44, for example in the form of a pump distribution gearbox.

[0083] The coupling device 43 can, in particular, be a switching coupling. This coupling can be adjusted between a torque-transmitting position and a non-torque-transmitting switching position and can be arranged within the primary drive train. Several such coupling devices 43, in particular in the form of one or more switching couplings, can also be included by the main machine 2, in particular by the primary drive train 34. Ideally, the coupling device 43 is designed as a primary drive coupling. With regard to the power flow, a primary drive coupling is a coupling device 43 that, on the output side to the primary drive unit 6, disconnects it from the primary drive train 34, in particular from the first hydraulic pump 26 and the second hydraulic pump 28 and / or one or more further hydraulic pumps 31, and especially from all hydraulic pumps, of the main machine 2.This makes it possible for the driving and working components of the main machine 2 to be fully driven when the construction machine 1 is driven by the secondary drive unit 14, thus ensuring the full functionality of the main machine 2. At the same time, the primary drive unit 6 does not need to be dragged along when it is decoupled from the other primary drive train 34.

[0084] The distributor 44 can, for example, be a pump distributor gearbox to which several hydraulic pumps, such as the auxiliary pump 42, are connected simultaneously. The other hydraulic pumps mentioned above, for example the first hydraulic pump 26, the second hydraulic pump 28 and / or one or more additional hydraulic pumps 31, can also be connected to the distributor 33.

[0085] Both the first hydraulic circuit 12 and the second hydraulic circuit 13, as well as the hybrid hydraulic circuit (either additionally or alternatively), can be designed as closed hydraulic circuits.

[0086] In particular, the first hydraulic pump 26 and / or the second hydraulic pump 28 and / or the add-on module hydraulic pump 17 and / or one or more additional hydraulic pumps 31 can be designed as a pump-motor unit and thus be operated both as a hydraulic pump and as a hydraulic motor. In the Fig. 3 and Fig. Figure 4 illustrates this with examples of the first hydraulic pump 26 and the add-on module hydraulic pump 17. Operating the add-on module hydraulic pump 17 as a feed pump enables the practically emission-free delivery of hydraulic fluid to the main machine 2 in the first hydraulic circuit 12 (or at least parts thereof) for driving the main machine 2, driven by the electric motor 15. In contrast, operating the add-on module hydraulic pump 17 as a hydraulic motor enables the electric motor 15 to be driven via the hybrid hydraulic circuit 37, thus allowing the electric motor 15 to be used as a generator to charge the electrical energy storage device 16. Using the first hydraulic pump 26 as a feed pump enables the first hydraulic motor 27 and / or the other hydraulic motor(s) 33 in the first hydraulic circuit to be driven via the primary drive unit 8.In contrast, using the first hydraulic pump 26 as a hydraulic motor enables the second hydraulic pump 28 (and / or the other hydraulic pumps 31) to also be driven via the secondary drive unit 14 through the existing coupling of the first hydraulic pump 26 with the second hydraulic pump 28 via the coupling device 36 (and / or a corresponding coupling to the other hydraulic pump(s)). The first hydraulic pump 26 can also additionally or alternatively have a blocking function within the first hydraulic circuit, thereby blocking one or more sections of the first hydraulic circuit 12 from flowing hydraulic fluid.

[0087] The Fig. Figures 5 to 8 illustrate various possible operating states using the example in the Fig. 3. The structure already described.

[0088] Fig. 5 relates to a conventional drive of the main machine 2 via the primary drive unit, Fig. 6 a drive of hydraulic motors arranged in the first hydraulic circuit via the secondary drive unit, Fig. 7 a drive of the first and second hydraulic circuits via the secondary drive unit and Fig. 8 a generator operation.

[0089] In the Fig. For the sake of clarity, numbers 5 to 8 do not include all of the items listed in the Fig. 3 and Fig. The four components are designated separately, and some are located in the... Fig. 3 and Fig. 4 included details not shown.

[0090] In conventional operation, as in the Fig. As illustrated in Figure 5, the primary drive unit 6 of the main machine 2 drives the individual hydraulic pumps 26, 28 and 31 (and possibly others, such as 42 from the) via the primary drive train. Fig. 3 and Fig. 4) The auxiliary drive module 10 is neither required for this purpose nor does it need to be carried by the main machine 2 for operation in this operating state. The first hydraulic pump 26 acts as a driven feed pump in the first hydraulic circuit 12.

[0091] In the operating conditions according to the Fig. 6 and Fig. 7 In contrast, the provision of drive energy for the operation of one or more of the hydraulic motors of the main machine 2 is no longer carried out by the primary drive unit 6, but by the secondary drive unit 14, which can be connected to the main machine 2 as described above.

[0092] In Fig. In section 6, the first hydraulic circuit 12 is partially integrated into the hybrid hydraulic circuit 37. The first hydraulic pump 26, which can be designed, for example, as a motor-pump unit with adjustable displacement, is set to a locked or zero position, for example, by the control unit 9 of the main machine 2 or the module control unit 22. In this case, no hydraulic fluid is pumped in the pipe section between the two connection points 45 (inlet) and 46 (return) of the first hydraulic circuit 12 and extending through the first hydraulic pump 26; in this case, the first hydraulic pump 26 acts as a shut-off valve in this pipe section. However, hydraulic energy provided by the add-on module hydraulic pump 17 is used to drive the first hydraulic motor and / or at least one other hydraulic motor 33.These can be arranged in parallel to each other or hydraulically connected in the first hydraulic circuit. The hybrid hydraulic circuit 37 can be configured such that the connection of the first line connection 19 and the second line connection 20 to the first hydraulic circuit 12 can be such that all of the hydraulic motors 27 and 33 of the first hydraulic circuit are arranged in parallel to the first hydraulic pump 26 in the hybrid hydraulic circuit 37. If the first hydraulic circuit 12 is thus a drive hydraulic circuit and the first hydraulic motor 27 and the at least one further hydraulic motor 33 are drive hydraulic motors, then in the operating state according to the... Fig. 6. Driving operation of the construction machine 1 bypassing the primary drive unit 6 and solely from the drive energy provided via the secondary drive unit 14 of the attachment drive module 10 can be achieved.

[0093] In the Fig. 7 will be opposite the Fig. Figure 6 illustrates an extended drive state in which, in addition to the hydraulic motors of the first hydraulic circuit, further hydraulic motors of other hydraulic circuits are now also driven by the secondary drive unit 14. The primary drive unit is still not used. In this case, the first hydraulic pump 26 in the hybrid hydraulic circuit 37 acts as a hydraulic motor. The drive is provided by hydraulic fluid supplied by the add-on module hydraulic pump 17. Via the coupling device 36, the hydraulic pump 26 drives, in particular mechanically, and especially directly mechanically, for example via a part of the primary drive train 34 or the primary drive train 34 itself, the second hydraulic pump 28 and / or at least one and / or further hydraulic pumps 28. The primary drive unit 6 can, for example, be connected via a coupling device 43, as shown in the Fig. As shown in Figure 4, the primary drive train 34 is decoupled, so that the primary drive unit does not have to be towed. In this operating state, the construction machine 1 is thus fully functional with respect to the main machine 2. Consumers driven via the second hydraulic circuit or the second hydraulic pump 28 of the second hydraulic circuit and / or via one of the further hydraulic pumps 31 in one or more further hydraulic circuits 30 can in this way be driven via the secondary drive unit 14 of the attachment drive module 10, without any significant modifications or adaptations to the main machine 2 being required.

[0094] Fig. Figure 8 illustrates a generator operating state of the construction machine 1. This can be used, for example, to charge the electrical energy storage device 16 by operating the electric motor 15 as a generator. In this case, the primary drive unit 6 drives the first hydraulic pump 26 via the primary drive train 34. This pump then acts as a delivery pump, but in the hybrid hydraulic circuit 37. It can be provided that the first hydraulic motor 27 and / or the at least further hydraulic motor(s) 33 of the first hydraulic circuit are set to a zero position in this case, so that hydraulic fluid does not pass through them. Additionally or alternatively, it can be provided that the first hydraulic motor 27 and / or the at least further hydraulic motor(s) 33 of the first hydraulic circuit can be locked in a position by means of a parking brake.It is also possible, additionally or alternatively, that the other hydraulic circuits, such as the second hydraulic circuit with the second hydraulic pump 28 and / or one or more of the other hydraulic circuits with one or more of the other hydraulic pumps 31, are decoupled from the primary drive train 34 or, in the case of variable displacement hydraulic pumps, are adjusted to a position in which they do not pump any hydraulic fluid in the respective hydraulic circuit.

[0095] Fig. Figure 9 illustrates the steps of a method 51 for converting a construction machine 2 or a main machine 2 into a construction machine 1 with an attached drive module 10, in particular as shown in the preceding figures. The main machine 2 can have a primary drive unit 6 and a hydraulic system 11 with a first hydraulic circuit 12 comprising a first hydraulic pump 26 and a first hydraulic motor 27, and with a second hydraulic circuit 13 comprising a second hydraulic pump 28 and a second hydraulic motor 29, wherein the first hydraulic pump 26 and the second hydraulic pump 28 are connected to each other via the coupling device 36 and can be driven together by the primary drive unit 6 via a primary drive train 34.

[0096] Starting from this, in step a) it can be provided that the main machine 2 receives 47 the add-on drive module 10. Furthermore, in step b) fluid-conducting connections 48, 19 between the add-on drive module 10 and the main machine 2 can be established such that a hybrid hydraulic circuit 37 is obtained, extending at least partially through the add-on module hydraulic pump 17 of the add-on drive module 10 and the first hydraulic fluid circuit 12, and driving the first hydraulic pump 26 and / or the first hydraulic motor 27. In step c) the add-on module hydraulic pump 17 is then driven 49 by a secondary drive unit 14 encompassed by the add-on drive module 10, thereby pumping hydraulic fluid in the hybrid hydraulic circuit 37 to drive the first hydraulic pump 26 and / or the first hydraulic motor 27. The sequence of these steps can vary.In particular, it is also possible for steps a) and b) to be performed in reverse order. This can be especially useful if a lifting device is included in the attachment drive module 10, which adjusts the relative position of the attachment operating mode 10 relative to the main machine 2 between a pickup position and an operating position, as explained in more detail below.

[0097] The mounting 47 of the attachment drive module can be carried out using a mounting device adjustable between a receiving position and an operating position, as already described in more detail above, wherein for this purpose the mounting device can first be adjusted into the receiving position to receive the attachment drive module and then into the operating position together with the attachment drive module, wherein the adjustment from the receiving position to the operating position can in particular include lifting and / or pivoting up the attachment drive module.

[0098] The procedure can include, prior to steps 47 to 49, the removal 50 of a tillage unit 3. It is then possible for the picking up 47 of the attachment drive module 10 to take place at exactly the same location and via the same bearing devices on which the tillage unit was previously mounted.

[0099] The main machine 2 and the attached drive unit 10 can each include a control unit 9, 22, which can exchange control and / or sensor data with each other via the signal transmission link 24, as shown in the schematic diagram of the Fig. Figure 10 illustrates this in more detail, explaining the operation of the control unit 9. For controlling the construction machine 1, and particularly for initiating step 49, the module control unit 22 may first query whether a connection to a main machine 2 exists. This can be done, for example, using a connection sensor 52 and / or by means of a status input from an operator. Furthermore, the module control unit 22 can query the current state of charge of the electrical energy storage device 16. The module control unit 22 communicates with the control unit 9 of the main machine 2 via the signal transmission line 24 and can transmit, for example, the data determined above or simply a release message indicating that the attachment drive module 10 could be used.The final decision as to whether the construction machine 1 is driven via the primary drive unit 6 (in the . Fig. 10 this state is designated with “(6)”) or the secondary drive unit 14 (in the Fig. If this state (10) is designated with “(14)”, the control unit 9 can make a decision based on a defined decision catalog 53. In particular, the control unit 9 can also transmit control commands to the first hydraulic pump 26 and / or the attachment module hydraulic pump 17, designed as a variable displacement hydraulic pump and / or motor-pump unit, especially for their operation as a pump or as a motor, depending on the currently specified operating state. Reference symbol list: 1 construction machine 2 Main engine 3 soil cultivation units 4 machine frames 5 Driving equipment 6 Primary drive unit 7 Reception facility 8 Driver's cab 9 Control unit 10 Add-on drive module 11 Hydraulic system 12 first hydraulic circuit 13 second hydraulic circuit 14 Secondary drive unit 15 Electric motor 16 electrical energy storage devices 17 Add-on module hydraulic pump 18 Management equipment 19 first line connection 20 second line connection 21 hydraulic connection interface 22 Module control unit 23 Communication device 24 Signal transmission link 25 Communication device 26 first hydraulic pump 27 first hydraulic motor 28 second hydraulic pump 29 second hydraulic motor 30 additional hydraulic circuits 31 Hydraulic pump 32 Hydraulic motor 33 more hydraulic motors 34 Primary drivetrain 35 support frames 36 Coupling device 37 Hybrid hydraulic circuit 38 Inlet connection 39 Return connection 40 Inlet pipe 41 Return line 42 secondary consumers 43 Clutch assembly, primary drive clutch 44 Distribution device 45 Junction 46 Junction 47 Recording 48 Manufacturing 49 Drive 50 Remove 51 procedures 52 Connection sensor 53 Decision Catalogue QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 4074894A1

[0002] DE 10 2017 011 476 A1

[0002] DE 10 2019 002 439 A1

[0002] EP 2353956B1

[0003]

Claims

[1] Construction machine (1), in particular tandem roller, with a) a main engine (2) comprising a machine frame (4), - Driving equipment (5), - a primary drive unit (6), - a hydraulic system (11) with - a first hydraulic circuit (12) with a first hydraulic pump (26) and a first hydraulic motor (27) - a second hydraulic circuit (13) with a second hydraulic pump (28) and with a second hydraulic motor (29), wherein the first hydraulic pump (26) and the second hydraulic pump (28) are connected to each other via a coupling device (36) and can be driven together by the primary drive unit (6) via a primary drive train (34), and b) an attachment drive module (10) comprising a secondary drive unit (14) and an attachment module hydraulic pump (17) driven by the secondary drive unit (14), - wherein a separable hydraulic connection interface (21) is provided between the main machine (2) and the attachment drive module (10), - wherein the attachment drive module (10) is connected to the first hydraulic circuit (12) via a first line connection (19) passing through the separable hydraulic connection interface (21) and via a second line connection (20) passing through the separable hydraulic connection interface (21) in order to maintain a hybrid hydraulic circuit (37) extending at least partially through the attachment module hydraulic pump (17) and the first hydraulic fluid circuit and driving the first hydraulic pump (26) and / or the first hydraulic motor (27). [2] Construction machine (1) according to claim 1, characterized by, that the first hydraulic circuit (12) is a, in particular closed, drive hydraulic circuit, the first hydraulic pump (26) is a drive hydraulic pump and the first hydraulic motor (27) is a drive hydraulic motor. [3] Construction machine (1) according to one of the preceding claims, characterized by , that the second hydraulic circuit (13) is a, in particular closed, vibration excitation hydraulic circuit, the second hydraulic pump (28) is a vibration excitation drive hydraulic pump and the second hydraulic motor (29) is a vibration excitation drive hydraulic motor. [4] Construction machine (1) according to one of the preceding claims, characterized by , that the coupling device (36) between the first hydraulic pump (26) and the second hydraulic pump (28) has at least one of the following features: - it is designed as a direct mechanical torque transmission connection between the first (26) and the second (28) hydraulic pump; - it is designed as a shaft drive extending between the first (26) and the second (28) hydraulic pump; - it includes a coupling device (43). [5] Construction machine (1) according to any one of the preceding claims, characterized by , that the main machine (2) has a receiving device (7) designed for the detachable receiving of a soil cultivation unit, and that the attachment drive module (10) is mounted on the main machine (2) of the construction machine (1) via the receiving device (7). [6] Construction machine (1) according to one of the preceding claims, characterized by , that the attachment drive module (10) has an adjustable receiving device (7). [7] Construction machine (1) according to one of claims 5 or 6, characterized by, that the receiving device (7) is adjustable between a receiving position and an operating position, in particular height-adjustable. [8] Construction machine (1) according to one of the preceding claims, characterized by , that the secondary drive unit (14) has an electrical energy storage device (16) and an electric motor (15) driven by electrical energy from the electrical energy storage device (16), which drives the attachment module hydraulic pump (17). [9] Construction machine (1) according to any one of the preceding claims, characterized by , that the attachment drive module (10) comprises a support frame (35) on which the secondary drive unit (14) and the attachment module hydraulic pump (17) are mounted. [10] Construction machine (1) according to any of the preceding claims, characterized by , that the separable hydraulic connection interface (21) has a connection valve assembly encompassed by the main machine (2). [11] Construction machine (1) according to one of the preceding claims, characterized by , that the separable hydraulic connection interface (21) on the side of the main machine (2) comprises at least one inlet port (38) and at least one return port (39), and that the attachment drive module (10) has an inlet line (40) connectable to the at least one inlet port (38) and a return line (41) connectable to the at least one return port (39), wherein the inlet line (40) and the return line (41) are fluidly connected to each other via the attachment module hydraulic pump (17) on the side of the attachment drive module (10). [12] Construction machine (1) according to any one of the preceding claims, characterized by , that the hybrid hydraulic circuit (37) is designed such that the first hydraulic pump (26) and the first hydraulic motor (27) are connected in parallel to each other. [13] Construction machine (1) according to any one of the preceding claims, characterized by , that the first hydraulic circuit (12) has at least one further hydraulic motor (33) in addition to the first hydraulic motor (27), and that the hybrid hydraulic circuit (37) is designed such that - the first hydraulic motor (27) and / or - which at least one further (33) hydraulic motor and the first hydraulic pump (26) are connected in parallel to each other. [14] Construction machine (1) according to any one of the preceding claims, characterized by , that the first and / or the second hydraulic pump (26, 28) and / or the attached hydraulic pump (17) are designed as variable displacement hydraulic pumps. [15] Construction machine (1) according to any one of the preceding claims, characterized by , that the first and / or the second hydraulic pump (26, 28) and / or the attached hydraulic pump (17) are designed as a pump-motor unit. [16] Construction machine (1) according to any of the preceding claims, characterized by, that a control unit (9) is included by the construction machine (1), in particular by the main machine (2), which is designed to control the first (26) and / or the second (28) hydraulic pump and / or the attached hydraulic pump (17). [17] Construction machine (1) according to any one of the preceding claims, characterized by , that the add-on drive module (10) has a module control unit (22) which communicates with the control unit (9) in particular via a signal transmission link (24). [18] Construction machine (1) according to any one of the preceding claims, characterized by , that a primary drive coupling (43) is provided between the first hydraulic pump (26) and / or the second hydraulic pump (28) and the primary drive unit (6), which in a disengaged state disconnects a torque transmission in the primary drive train (34) from the primary drive unit (6) to the first hydraulic pump (26) and / or to the second hydraulic pump (28). [19] Method (51) for retrofitting a construction machine (1), in particular a construction machine (1) according to one of the preceding claims, the construction machine (1) comprising: - a main machine (2) with a primary drive unit (6) and a hydraulic system (11) with a first hydraulic circuit (12) with a first hydraulic pump (26) and a first hydraulic motor (27) and with a second hydraulic circuit (13) with a second hydraulic pump (28) and with a second hydraulic motor (29), wherein the first hydraulic pump (26) and the second hydraulic pump (28) are drive-connected to each other via a coupling device (36) and can be driven together via a primary drive train (34) from the primary drive unit (6), comprising the steps: a) Picking up (47) an add-on drive module (10), b) Establishing (48) fluid-conducting connections between the attachment drive module (10) and the main machine (2) such that a hybrid hydraulic circuit (37) is obtained which extends at least partially through an attachment module hydraulic pump (17) of the attachment drive module (10) and the first hydraulic fluid circuit (12) and drives the first hydraulic pump (26) and / or the first hydraulic motor (27); c) Driving (49) the attachment module hydraulic pump (17) by means of a secondary drive unit (14) encompassed by the attachment drive module (10) and thereby pumping hydraulic fluid in the hybrid hydraulic circuit (37) to drive the first hydraulic pump (26) and / or the first hydraulic motor (27). [20] Method (51) according to claim 19, characterized by , that the picking up (47) of the attachment drive module (10) is carried out using a picking device (7) that is adjustable between a picking position and an operating position. [21] Method (51) according to one of claims 19 or 20, characterized by , that in step a) the receiving device (7) is first adjusted into the receiving position to receive the attachment drive module (10) and then into the operating position together with the attachment drive module (10), wherein the adjustment from the receiving position to the operating position includes in particular lifting and / or pivoting up the attachment drive module (10). [22] Method (51) according to any one of claims 19 to 21, characterized by , that in step c) parallel driving within the hybrid hydraulic circuit (37) is carried out by hydraulic fluid supplied by the attachment module hydraulic pump (17) of at least two of the following units: - the first hydraulic pump (26) designed as a pump-motor unit, - the first hydraulic motor (27), - at least one additional hydraulic motor (33). [23] Method (51) according to any one of claims 19 to 22, characterized by , that in step c) using a coupling device (36) at least the second hydraulic pump (28) in the second hydraulic circuit (13) is driven by a torque transmission via the coupling device (36) between the first hydraulic pump (26) and the second hydraulic pump (28). [24] Method (51) according to any one of claims 19 to 23, characterized by , that the attachment module hydraulic pump (17) and / or the first hydraulic pump (26), in particular designed as a pump-motor unit, are designed as a variable displacement hydraulic pump, and that in step c) one or more operating parameters of the attachment module hydraulic pump (17) and / or first hydraulic pump (26) and / or second hydraulic pump (28) are controlled. [25] Method (51) according to any one of claims 19 to 24, characterized by, that the secondary drive unit (14) has an electric motor (15), and that the hybrid hydraulic circuit (37) in a generator operating state drives the attached hydraulic pump (17) designed as a motor-pump unit to charge the energy storage (16) of the attached drive module (10). [26] Method (51) according to any one of claims 19 to 25, characterized by , that the method (51) is further developed into a method for retrofitting a construction machine (1), in particular a construction machine (1) according to one of claims 1 to 17, comprising first the main machine (2) with a soil cultivation unit (3) designed to be detachable from the main machine (2) and starting from this, prior to step a) a removal of the soil cultivation unit (3) and in step a) the receiving and storage of the attachment drive module (10) via bearing devices of the receiving device (7) on which the soil cultivation unit (3) was formerly stored. [27] Method (51) according to claim 26, characterized by , that first the receiving device (7) is moved from the operating position to the receiving position for setting down the soil cultivation unit (3).

Images