Work vehicle for carrying out work operations on a track

Abstract

Work vehicle (2) for carrying out work operations on a track (39), comprising a vehicle frame (1) which is supported on rail bogies (11) and is movable on the track (39), a driver's cabin (21) which is connected to the vehicle frame (1), and various superstructures with associated functions for a work operation, characterized in that the superstructures are designed as self-supporting functional modules (12-22) with predefined interfaces (23) and are connected to the vehicle frame (1) and / or to each other by means of screw connections.

Description

Technical area

[0001] The invention relates to a work vehicle for carrying out work on a track, comprising a vehicle frame which is movable on the track supported on rail bogies, a driver's cab which is connected to the vehicle frame, and various superstructures with associated functions for a work operation. State of the art

[0002] A work vehicle of this type is known from AT 520 066 A1. The superstructures with assigned functions include a work platform and a crane with a work basket. During work, the vehicle is supplied with electrical energy from several energy storage modules (battery packs).

[0003] AT 16702 U2 discloses a similar work vehicle, which is also powered by energy storage modules. The body of the work vehicle is divided lengthwise into several sections. One of these sections is a walk-in operating compartment housing the energy storage modules. By varying the module arrangements, different control cabinet heights and thus different room heights can be achieved. This allows for a recess in the vehicle roof into which a work platform can be lowered when not in use. Description of the invention

[0004] The invention is based on the object of improving a work vehicle of the type mentioned at the outset in such a way that different superstructures can be arranged on the vehicle in an efficient manner.

[0005] According to the invention, this object is achieved by the features of independent claim 1. Dependent claims specify advantageous embodiments of the invention.

[0006] The superstructures are designed as self-supporting functional modules with predefined interfaces and are connected to the vehicle frame and / or to each other by means of screw connections. The functional modules are characterized by their inherent function, an input and an output, by system boundaries and the predefined interfaces, as well as by interactions with other functional modules and with an overall machine function. Such self-supporting functional modules are pre-assembled and thoroughly tested before installation in the work vehicle. If necessary, the module surfaces are also painted beforehand so that the vehicle is ready for use immediately after module assembly. The predefined interfaces enable the interconnection of different functional modules without further adaptations. The pre-performed tests are carried out using a diagnostic device with the same predefined interfaces.In particular, the diagnostic system includes universal measuring and testing devices and joining elements for mechanically fastening the respective self-supporting functional modules, as well as a control unit for controlling various functional modules. Module diagnostics and system testing prior to assembly optimize the time required for vehicle commissioning. All modules are continuously checked for their geometry and functions to ensure assembly during final assembly without the need for welding or adjustment processes.

[0007] The vehicle according to the invention exhibits a high level of operational reliability thanks to comprehensive module testing and any necessary corrections. Early error detection during module testing and system verification after module assembly minimize error costs. Furthermore, the application limits of the individual functional modules are specified and verifiable. The interactions between the module functions are also known in advance. The smaller number of component variants compared to known vehicle concepts further increases operational reliability.

[0008] If the configuration of functional modules changes, a one-time type test and declaration of conformity prior to the vehicle registration process leads to simplified subsequent approval. Using the declaration of conformity instead of multiple individual type tests and faster assembly reduce production lead times. New module combinations make it easy to expand the vehicle's operational functions and range of application with new functions.

[0009] In particular, the elimination of conventional mechanical assembly and the avoidance of welding during final assembly contribute to the prevention of errors. Overall, the modular design simplifies maintenance work and allows for easy retrofitting of technical modifications. At the end of the service life, the raw materials can be easily scrapped and recycled.

[0010] Advantageously, the predefined interfaces are designed as mechanical and electrical and / or hydraulic and / or pneumatic interfaces. The interfaces of the individual functional modules are connected directly to one another or via modular lines. These lines are positioned in defined channels and cable guides and fixed in position at the interfaces, which are designed, for example, as connectors, flanges, or quick-release fasteners. In particular, the interfaces serve for the attachment, power supply, communication, and diagnostics of the individual functional modules. A corresponding diagnostic device sensibly includes a universal interface for electrical, hydraulic, compressed air, fuel, water, oil, and various auxiliary materials (e.g., urea solution for combustion engines).

[0011] In a further improvement, the predefined interfaces include joining elements that enable adjustment of the respective functional module, particularly in two mutually orthogonal directions. This ensures precise positioning of the modules during final assembly. The mechanical interfaces and joining elements fit precisely and can be secured using screw connections. This eliminates the need for welding during final assembly. The joining connections compensate for volume and length dilation due to thermal expansion, etc. During final assembly, the individual functional modules are joined together step by step on the vehicle frame, which serves as a platform, with the defined mechanical interfaces serving as fastening. For example, fastening is achieved via a hole pattern with screw connections and elastic suspensions.Clear joining locations are assigned, which prevents collisions between components.

[0012] In a further development, the predefined interfaces include joining elements that have a unique geometric fit to each other. This ensures clear connections, preventing interface errors. Poka Joke principles are preferably applied, for example, shape coding to specify unique positions.

[0013] A vehicle frame with two lateral longitudinal members, whose upper edges span a vehicle floor, is advantageous, with at least one functional module arranged as an underfloor module beneath the vehicle floor. Thus, the vehicle floor can be considered a dividing plane between a space for above-floor installation of functional modules and a space for below-floor installation of functional modules. The size and shape of each installation space can be varied by the arrangement and dimensioning of the longitudinal members. The arrangement of cross members, which are rigidly connected to the longitudinal members, also influences the respective installation space.

[0014] Advantageously, each longitudinal member comprises a longitudinal member upper chord and a longitudinal member lower chord, which are connected to each other by several equally spaced connecting elements. The design of the lower chord determines the space for underfloor installation. Each lower chord is connected to the corresponding upper chord in a standardized manner via connecting elements (struts). This design increases the bending, tensile, compressive, and torsional rigidity of the frame without restricting the installation space for the functional modules.

[0015] In a useful development of the invention, an underfloor module is designed as a traction module, wherein the traction module comprises an internal combustion engine coupled to a generator and / or a pump distribution gear. Such a traction module for the movement of the vehicle also supplies the other functional modules with energy.

[0016] An advantageous arrangement is one in which at least one functional module is designed to be movable on guides relative to the vehicle frame. This allows the position of the vehicle's center of gravity to be shifted to optimize weight distribution on the rail bogies. For this weight adjustment, the corresponding functional module can be moved in stages or continuously in the longitudinal and transverse directions.

[0017] Preferably, a movable functional module such as a tank, a power pack, etc. is mounted on a subframe. The mounting position is varied in the transverse direction by lateral displacement of the respective functional module on the subframe.

[0018] In a further improvement of the invention, the vehicle frame is divided longitudinally into three sections, with the driver's cab located on one end section, a crane module or another cab located on the other end section, and additional functional modules mounted on the middle section. With this longitudinal modular concept, the assembly space for the assembly of the functional modules is fixed in width and variable in length and height. In particular, the middle section is variable in the longitudinal direction to allow the arrangement of different functional modules.

[0019] To ensure the optimal assembly of selected functional modules, the assembly space, defined by the dimensions of the vehicle frame and a required clearance profile, is divided into several vertical, longitudinal, and transverse segments. Preferably, four segments are arranged vertically (e.g., bogie, cab, roof superstructure, and underfloor arrangement), ten segments are arranged longitudinally (e.g., buffers and draw hooks, cab, crane, loading area, etc.), and three segments are arranged transversely (e.g., driver's cab, pilot's cab, etc.).

[0020] In a further improvement, modular control software is installed in a control system, with individual software modules assigned to different functional modules and each software module being separately activated. The modular concept of the control software conforms to the functional modules that can be selected from a predefined module catalog, and the control software can be adapted to the respective configuration of the machine functions.

[0021] In the work vehicle according to the invention, the vehicle frame is manufactured with dimensions adapted to selected functional modules, with each functional module initially pre-assembled as a self-supporting unit, and the pre-assembled functional modules being bolted to the vehicle frame and / or to each other. The vehicle frame serves as a platform that can be varied and scaled in width, length, and height according to defined standards.

[0022] The reduced number of component variants compared to conventional vehicle concepts offers further advantages. Manufacturing costs are reduced, and logistics are simplified by maintaining a minimum inventory of functional modules and modular components. A high level of detail enables easy understanding and clear assignment of assembly assemblies and individual parts. The assembly concept allows for a high number of repetitions, using identical parts with few standard part variants. In addition, CAD assembly tools (e.g., 3D representations of individual components in the assembled state, or virtual reality or augmented reality as assembly aids) enable simplified, standardized assembly.

[0023] In a further development, the respective pre-assembled functional module is commissioned using a diagnostic device before installation. This allows for a geometric and functional check of each functional module to eliminate potential errors or weak points before installation. Specifically, the module diagnosis is carried out using a test device for the quantitative measurement and assessment of the individual functional modules and the qualitative evaluation of the functional systems for final assembly. The resulting quality assurance and consistent validation using a rapid test procedure for the quantitative performance assessment of the functional units serves for evaluation and documentation for traceability and obsolescence management.

[0024] A further improvement involves modular control software installed in a control system that is adapted to the installed function modules. For each selected and installed function module, the corresponding part of the control software is activated and enabled. This facilitates structured programming of the machine control system. Furthermore, adaptations to changing requirements and legal requirements can be easily implemented by exchanging individual function modules and control components. Short description of the drawings

[0025] The invention is explained below by way of example with reference to the accompanying figures. They show schematically: Fig. 1 Vehicle frame in a top view Fig. 2 vehicle frames in a side view Fig. 3 Cross-section of the vehicle frame Fig. 4 Vehicle cross-section Fig. 5 Diagnostic device Fig. 6 Vehicle concept in a side view and a top view Fig. 7 different vehicle configurations Fig. 8 Vehicle configuration with crane and lifting platform Fig. 9 Traction module with generator Fig. 10 Traction module with pump distribution gear Description of the embodiments

[0026] The Fig. 1-3 show an exemplary vehicle frame 1 for a work vehicle 2 based on a modular system. The main elements of the vehicle frame 1 are two lateral longitudinal members 3, each having an upper chord 4 and a lower chord 5. The respective upper chord 4 and the corresponding lower chord 5 are connected by connecting elements (struts) 6, which are arranged at equal distances from one another in a vehicle longitudinal direction 7. This provides a standardized scaling of the vehicle frame 1, allowing it to be manufactured in different lengths.

[0027] The vehicle frame 1 is divided into two end sections 8 and an intermediate middle section 9. In each end section 8, the longitudinal members 3 are rigidly connected to a cross member 10. Pivot pins and supports for modular rail bogies 11 are arranged on these cross members 10. Optionally, a further cross member 10 is positioned in the middle section 8 as a support for a crane module 12. The position of this cross member 10 can be freely selected in the longitudinal direction 7 along the scale specified by the connecting elements 6. In particular, the respective bottom chord 5 is arranged only in the middle section 9.

[0028] According to the invention, the dimensions of the vehicle frame 1 are adapted to selected functional modules 11-22. This selection is derived from specified vehicle requirements. In a preliminary design phase, a module catalog is created in which each functional module 11-22 is defined with all functions and predefined interfaces 23. Subsequently, all possible functional modules 11-22 and their possible combinations are defined to meet the specifications. Positioning conditions and compliance with application limits (clearance profile, track gauge, route class, standards, and laws) are determined. Exclusion criteria for non-possible combinations are also defined. A corresponding algorithm is advantageously used in a computer-implemented module configurator.This allows functional modules 11-22 and machine functions to be combined automatically, taking into account the application limits, technical service life, and exclusion criteria. This automated module configuration also takes country-specific conditions into account. To provide a cost and pricing toolbox, the module configurator can be expanded with a cost calculation algorithm. In addition, a virtual configuration of vehicle 2 using a CAD algorithm for selecting module combinations from a module library is useful.

[0029] The standardized functional modules 11-22 can be combined with one another using a modular system and are partially scalable in size and functionality. In addition to a rail chassis module 11 and a crane module 12, a lifting platform module 13, a traction module (power pack) 14, a tank module 15, an overhead line and power supply module 16, a workshop module 17, a social cabin module 18, a technical room module 19, a loading area module 20, a driver's cabin 21, and various other modules 22 can be selected as functional modules. Modules 11-22 are scalable, particularly according to customer-specific requirements. For example, crane load capacities and boom reach can be varied.

[0030] Each of these functional modules 11-22 is designed as a self-supporting unit with predefined interfaces 23. A lightweight construction method is used to reduce vehicle weight and increase the number of attachable modules 11-22, taking into account the maximum permissible axle load and the respective route class. For example, cabins 17, 18, 19, and 21 are made of a wrought aluminum alloy. Laser-cut and folded aluminum sheets with a thickness of 5 mm to 10 mm are installed in a spade-type construction. Furthermore, the use of high-strength fine-grain structural steels reduces material thickness and vehicle weight.

[0031] Depending on the function of the respective module 11-22, the predefined interfaces 23 include mechanical, electrical, hydraulic, pneumatic, and other connections. In particular, data interfaces are provided for communication with other modules 11-22 and with a central control device 24. Individual modules, such as the traction module 14, are preferably mounted on a subframe 25. All relevant components for the respective functional unit are spatially compactly combined. The functional module 11-22 constructed in this way is easy to transport and can be positioned and installed using a crane or lifting device. A high level of design detail and the clear construction method enable prefabrication of the functional modules 11-22 at different production locations. Continuous change management ensures historical tracking.In addition, standardized retrofit and upgrade management is in place for ongoing technical updates and standard-compliant adaptation of existing vehicles to ensure long-term service life.

[0032] For a new vehicle 2, a basic type and drive concept are initially defined. For example, a choice is made between two single axles and two bogies as the basic rail bogies 11. A basic vehicle 2 consists of two rail bogies 11, the vehicle frame 1 with integrated modules for traction and driving operation, a driver's cab 21 with the vehicle control system and a standard-compliant workstation for the driver, as well as free space for functional modules 11-22. The minimum configuration of modules 11-22 for implementing the basic functions of driving and standing is also specified. All functional modules 11-22 can be used for both a two-axle and a four-axle platform.

[0033] The vehicle frame 1 serves as a platform on which the functional modules 11-22 selected from the modular system are assembled during final assembly. The upper chord 4 is a standardized main beam with defined interfaces in the longitudinal direction 7. On each side, there is a free space 26 for maintenance components between the upper chord 4 and the lower chord 5. Cable trays 27 are arranged externally along the entire length of the vehicle. The upper edges of the longitudinal beams 3 span a vehicle floor 28, which divides an assembly space into an upper and a lower section. As shown in Fig. As can be seen in Figure 3, there is a clearance 29 between the longitudinal members 3 for underfloor installation. The optional center cross member 10 and the connecting elements 6 have openings for cable routing. The cable routing is preferably positioned laterally in the area of ​​the lower chords and provides space for a cable harness and for hydraulic and pneumatic lines. The design of the standardized functional modules 11-22 allows for variable mounting locations on the base frame 1.

[0034] The assembly of the work vehicle 2 is carried out with reference to the Fig. 4-6. A distinction is first made between the underfloor assembly compartment 29 and an above-floor assembly compartment 30. The traction modules 14 for operating the vehicle 2 are preferably arranged below floor (e.g., bogies, power pack, transformer, accumulators, etc.). The traction module 14 comprises, for example, a motor, a generator, an electric drive, and, if necessary, a braking energy recuperator. Furthermore, the traction module 14 is coupled to overhead line power supply modules 16. Additional components, such as accumulators, fuel cells, and other new energy sources (solar systems), are also arranged.

[0035] The vehicle floor 28 accommodates, for example, the technical room 19, driver cabins 21, electrical control cabinets, crew cabins 18, the workshop 17, the crane 12, and the lifting platform 13. Buffers and coupling devices are provided at the front 31 and rear 32. These allow trailers to be coupled or several vehicles 2 to be coupled together. Furthermore, there is the option of attaching add-on modules 22 for special functions (snow removal equipment, measuring devices, etc.). The roof of the cabins 21 provides space for roof-mounted superstructures 16 (e.g., current collectors, braking resistors, cables, etc.).

[0036] In the vertical direction 33, the modules 11-22 are mounted one above the other in four segments. Starting from the bottom, the first segment includes, for example, rail bogies 11. The second segment, between the lower chord 5 and upper chord 4, serves, for example, to accommodate the traction module (power pack) 14, a transformer module, an accumulator module, and a tank module 15. Cabins 21, a crane module 12, and a lifting platform module 13 can be arranged in the third segment above the vehicle floor 28. The fourth segment on the roof includes, for example, current collectors, braking resistors, and various work equipment such as line pushers.

[0037] In the transverse direction 34, modules 11-22 are preferably installed in three segments. Maintenance shafts for cable routing, for example, are located on the left and right sides. A segment for the functional units is located between them.

[0038] In the longitudinal direction 7, the vehicle is divided into up to ten segments. These segments contain, for example, buffers and draw hooks, the driver's cabin 21, the staff cabin 18, the workshop cabin 17, the lifting platform 13, the loading area 20, a tool room, the crane 12, a crane cabin, and again buffers and draw hooks.

[0039] Fig. 6 shows a variation of the mounting position of a functional module 11-22 in the vertical direction 33, the longitudinal direction 7, and the transverse direction 34. For example, a tank module 15 is mounted on a subframe 25. Lateral displacement of the tank module 15 on the subframe 25 then enables a change in the mounting position in the transverse direction 34. A change in the mounting position in the longitudinal direction 7 is achieved by displacing the subframe 25 on the vehicle frame 1 along guides. In the vertical direction 33, a displacement of the module 15 along the connecting elements 6 between the upper and lower chords 4, 5 causes a change in the mounting position.

[0040] Before final assembly of modules 11-22, a module diagnosis is performed. Modules inspected in this way are assembled similarly to a modular principle and connected with positive and non-positive fit. The same applies to the assembly of cables and accessories. Orientation and positioning are clearly specified and enforced, for example, by coordinated shaping. Each joining process is checked using a checklist and approved and confirmed by a worker self-test. After joining modules 11-22 and the connecting cables, the system functions are checked and verified by a machine evaluation.

[0041] The module diagnostics include a quantitative measurement and assessment of the individual modules 11-22 and a qualitative evaluation of the functional systems for final assembly. For example, the following checks are performed on a traction module (power pack) 14: - Electrical input and output measurement - Electrical analysis of the signals - Checking the media flow: fuel, cooling water, additives, cooling air flow - Hot measurement of a combustion engine 37: Load-free speed run-up with current measurement (transient) - Test program for testing a control program (I / O check and actuator check) - Weight measurement and photo documentation - Scanning data matrix codes, etc. - Special measurement of vibration and noise emission and particle counter - Validation checklist for e.g. visual inspection and test procedure - Inspection marking (good / bad, rework)

[0042] A schematic in Fig. The universal diagnostic device 38 shown in Figure 5 is designed to test all modules 11-22. A setup station includes a delivery zone, a mobile transport device with module fastening, a lifting device, and assembly tools. The diagnostic device 38 itself is a universal measuring and testing device with mechanical fastening elements adapted to the mechanical interfaces of the modules 11-22, with its own power supply, with a universal interface for electrical, hydraulic, fuel, additives, water, air, and oil, with measuring devices for recording all electrical measured variables, with a control device 24 for generating and processing all control signals, with various media (e.g.Coriolis sensor from Danfoss), with sensors for time measurement, image capture, and force measurement, with a scanner for data matrix (batch and date), with traceability components (linking part numbers to date, batch, and evaluation), and with components for calibrating the measurement technology. The . Fig. The interfaces 23 of the diagnostic devices 38 indicated in 5 are coordinated with all predefined interfaces 23 of the modules 11-22 to be tested.

[0043] Advantageously, the diagnostic device 38 comprises an ERP interface for data acquisition, for conversion in a formatted database, for assignment of measurement data to part number, batch, date and order number, for data archiving in a database, for printing test reports as required, for statistical evaluations and generally for evaluation (good / bad).

[0044] A rework station includes a complete set of assembly tools, a workbench, media tanks, equipment for evaluating a fault, and equipment for troubleshooting. After such a fault correction, the system is returned to the measuring station for further testing using the diagnostic device 38.

[0045] All modules 11-22 that have been inspected and approved are assembled and screwed together step by step during final assembly. As with a modular assembly kit, all functional modules 11-22 are stacked on top of each other and connected to each other and / or to the vehicle frame 1. This assembly process preferably takes place from top to bottom. Alternatively, a bottom-to-top assembly process is also possible. By specifying the module arrangement, assembly sequence, and assembly positions, the vehicle 2 can be assembled quickly on track 39 using a mobile crane.

[0046] After module assembly and testing, the system functions are tested and verified. The main functions are activated in a manual or automated process, and the responses are measured. This allows both simple I / O processes and complex system functions to be tested and verified. The application limits are defined, and pass / fail evaluations can be performed in a standardized and automated manner.

[0047] With reference to Fig. 7 explains the common parts concept. The basis for all modules 11-22 is the same vehicle frame 1. The vehicles 2 shown differ in their construction due to the differently selected add-on modules 12-22. For example, the uppermost vehicle comprises a driver's cabin module 21, a social cabin module 18, a workshop module 17 with a platform, a technical room module 19, and another driver's cabin module 21. In the middle vehicle 2, the workshop module 17 is combined with a storage compartment. The lower vehicle 2 has a loading area module 20 instead of a social cabin 18. Control software for controlling the modules 11-22 is set up in the control device 24. A software module 40 is assigned to each selectable functional module 11-22. The software modules 40 are activated according to the functional modules 11-22 installed on the respective vehicle 2.

[0048] Fig. Figure 8 shows a fully assembled work vehicle 1 on track 39, with a crane module 12, a driver's cab / crane cabin 21, a social / workshop module 17, 18, a lifting platform module 13, an overhead line and power supply module 16, and another driver's cab 21 as above-floor modules. Additional modules 22 (e.g., various work units) are mounted on the roof. A traction module (power pack) 14, a tank module 15 for fuel, a tank module 15 for hydraulic oil, and various other modules 22 (e.g., a transformer module, cooling system module, braking resistor module, battery module with battery thermal management system) are arranged as underfloor modules.

[0049] Two alternative traction modules 14 are available in the Fig. 9 and Fig. 10. The conceptual structure is divided into a fixed area, a modular area 35, and an expandable area 36. The fixed area accommodates, for example, an internal combustion engine 37, a coolant cooler 41, a charge air cooler 42, an exhaust system 43, and a urea solution tank.

[0050] Different components are arranged in the modular area so that the traction module 14 can serve, for example, as a diesel-electric energy source, a hydrostatic energy source, or a hydrodynamic energy source. In the diesel-electric version in Fig. 9, the combustion engine 37 is coupled to a generator rotor 44 and hydraulic pumps 45. In the hydrostatic version in Fig. 10, the combustion engine 37 is coupled to a pump distribution gear 46. In the expandable area 36, ​​for example, there is an exhaust flap 47.

[0051] A support frame 48 with connecting bearings serves as predefined mechanical interfaces 23 to connect the individual components. If necessary, the support frame 48 is mounted on the vehicle frame 1 using a subframe 25. The complete unit can be easily disassembled for servicing. The described concept can also be applied to other modules, such as an accumulator module, a hydraulic module, a fuel tank module, a transformer module, or a cooling system module. QUOTES CONTAINED IN THE DESCRIPTION

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

[0000] AT 520 066 A1

[0002]

Claims

[1] Work vehicle (2) for carrying out work on a track (39), comprising a vehicle frame (1) which is movable on the track (39) supported on rail carriages (11), a driver's cabin (21) which is connected to the vehicle frame (1), and various superstructures with associated functions for a work operation, characterized by that the superstructures are designed as self-supporting functional modules (12-22) with predefined interfaces (23) and are connected to the vehicle frame (1) and / or to one another by means of screw connections. [2] Work vehicle (2) according to claim 1, characterized by that mechanical and electrical and / or hydraulic and / or pneumatic interfaces (23) are predefined. [3] Work vehicle (2) according to claim 1 or 2, characterized bythat the predefined interfaces (23) comprise joining elements which enable adjustment of the respective functional module (12-22) in particular in two mutually orthogonal directions. [4] Work vehicle (2) according to one of claims 1 to 3, characterized by that the predefined interfaces (23) comprise joining elements which have a unique geometric fit to one another. [5] Work vehicle (2) according to one of claims 1 to 4, characterized by that the vehicle frame (1) comprises two lateral longitudinal members (3), the upper edges of which span a vehicle floor (28) and that at least one functional module (11-15) is arranged as an underfloor module below the vehicle floor (28). [6] Work vehicle (2) according to claim 5, characterized bythat the respective longitudinal member (3) comprises a longitudinal member upper chord (4) and a longitudinal member lower chord (5), which are connected to one another by a plurality of connecting elements (6) arranged at equal distances from one another. [7] Work vehicle (2) according to claim 5 or 6, characterized by that an underfloor module is designed as a traction module (14) and that the traction module (14) comprises an internal combustion engine (37) which is coupled to a generator (44) and / or a pump distribution gear (46). [8] Work vehicle (2) according to one of claims 1 to 7, characterized by that at least one functional module (12-22) is designed to be displaceable on guides relative to the vehicle frame (1). [9] Work vehicle (2) according to claim 8, characterized by that the movable functional module (12-22) is mounted on a subframe (25). [10] Work vehicle (2) according to one of claims 1 to 9, characterized bythat the vehicle frame (1) is divided into three sections (8, 9) in the longitudinal direction (7), that the driver's cabin (21) is arranged on one end section (8), that a crane module (12) or a further cabin (21) is arranged on the other end section (8) and that further functional modules (12-22) are built on the middle section (9). [11] Work vehicle (2) according to one of claims 1 to 10, characterized by that an assembly space (29-32) predetermined by the dimensions of the vehicle frame (1) and by a clearance profile to be maintained is divided into several segments in the vertical direction (33), in the longitudinal direction (7) and in the transverse direction (34) for assembling the functional modules (12-22). [12] Work vehicle (2) according to one of claims 1 to 11, characterized bythat modular control software is set up in a control device (24), that different functional modules (12-22) are assigned their own software modules (40) and that the software modules (40) can be activated separately. [13] Work vehicle (2) according to one of claims 1 to 12, characterized by that the vehicle frame (1) is manufactured with dimensions adapted to selected functional modules (12-22), that each functional module (12-22) is initially pre-assembled as a self-supporting unit and that the pre-assembled functional modules (12-22) are screwed to the vehicle frame (1) and / or to one another. [14] Work vehicle (2) according to claim 13, characterized by that the respective pre-assembled functional module (12-22) is put into operation by means of a diagnostic device (38) before installation. [15] Work vehicle (2) according to claim 13 or 14, characterized bythat a modular control software installed in a control device (24) is adapted to the installed functional modules (12-22).

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