drive unit

Abstract

Drive unit for a shunting drive (1) of a road-going vehicle trailer (3), wherein the drive unit (2) comprises a drive device (8) which includes a rotatably driven cylindrical drive roller (9) with a central roller axle (18) that can be positioned against a trailer wheel (7) of the vehicle trailer (3), a movable roller carrier (11) and a roller drive (10), wherein the roller drive (10) comprises a drive motor (21) and a transmission (23) connected to the drive roller (9) and arranged completely or at least predominantly within the drive roller (9), wherein the drive motor (21) is arranged outside and separately from the drive roller (9) and drives the drive roller (9) via an intermediate drive (27) coupled to the transmission (23), wherein the intermediate drive (27) is arranged on the roller carrier (11) and substantially outside the drive roller (9), wherein - the transmission (23) comprises several transmission stages and / or the transmission (23) is designed as an epicyclic gear transmission, in particular as a planetary gear transmission, - wherein the drive motor (21) and the gearbox (23) have parallel axes (22, 24) and the gearbox (23) has a gearbox axis (24) arranged concentrically to the roller axis (18), characterized in that the output from the gearbox (23) to the drive roller (9) is made via a planetary roller carrier, in particular a planet carrier, which is rigidly connected to the drive roller (9).

Description

[0001] The invention relates to a drive unit and a shunting drive for a road-going vehicle trailer with the features in the preamble of the main claim.

[0002] Such a drive unit is known from EP 2 138 387 A1. It comprises a drive device which includes a cylindrical drive roller with a central roller axle, which can be positioned against a trailer wheel of the vehicle trailer, a movable roller carrier, and a roller drive. The roller drive has a drive motor arranged outside and separately from the drive roller and a multi-stage gearbox connected to the drive roller and arranged completely or at least predominantly within the drive roller. The drive motor, the gearbox, and the drive roller have parallel axes.

[0003] Another drive unit is known from EP 2 208 661 A1. The gearbox of the roller drive is arranged in the hollow drive roller, with the drive motor being arranged coaxially to the gearbox and also being arranged completely or at least partially in the drive roller.

[0004] EP 3 552 932 A1 and DE 20 2018 10 1924 U1 disclose a different drive unit for a shunting drive of a road-going vehicle trailer, in which the drive motor of the roller drive and the gearbox are arranged essentially outside the drive roller, the drive roller having an integrally molded inner toothed ring with which an eccentrically arranged output pinion of the gearbox meshes.

[0005] In the drive unit of EP 1 394 024 A2, a gearbox is arranged directly on the drive motor, wherein the output shaft of the motor / gearbox unit, which is driven transversely to the motor orientation, on the one hand directly drives the spaced, thin friction roller via a chain drive and on the other hand rotates a cam disc which, through its spiral and worm shape, causes a feed of the drive unit by means of the rotation, supported on a bolt and against a return spring.

[0006] The object of the present invention is to demonstrate an improved drive unit for a shunting drive of a road-going vehicle trailer.

[0007] The invention solves this problem with the features in the independent claims.

[0008] The drive unit and the shunting drive have several advantages.

[0009] The claimed drive unit for a shunting drive of a road-legal vehicle trailer can have the basic design mentioned in the preamble. The drive unit can have at least one drive device comprising a rotating drive roller that can be positioned against a trailer wheel of the vehicle trailer, a movable roller carrier, and a roller drive. The roller drive can have a drive motor and a gearbox connected to the drive roller and arranged completely or at least predominantly within the drive roller.

[0010] The driven drive roller can engage with the trailer wheel, for example, with the tread of its tire, and thus rotate the trailer wheel. This enables motorized movement, particularly maneuvering, of the road-legal trailer. For this purpose, the drive roller can have a roller surface designed for optimal traction, such as one with external grooves. Alternatively or additionally, the drive roller can engage with another part of a trailer wheel, such as a rim or similar component.

[0011] The preferably electric and controllable drive motor, e.g., a DC motor, of the roller drive is arranged outside and separately from the drive roller and from the gearbox, which is located completely or at least predominantly inside the drive roller. This spatial separation has several advantages.

[0012] On the one hand, the dimensions, type, and positioning of the drive motor, preferably mounted on the roller carrier, can be selected and varied as needed. This allows for the accommodation of different requirements, such as varying drive torques and power outputs depending on the trailer weight and number of axles. On the other hand, thermal advantages arise. The heat generated by the drive motor can be absorbed and dissipated by the roller carrier. This keeps the motor heat away from the gearbox. Furthermore, the installation space within the hollow interior of the drive roller and on the roller carrier can be optimally utilized. The gearbox can be arranged concentrically to the cylindrical drive roller and preferably entirely within its interior.

[0013] Furthermore, advantages arise for the stable support and mounting of the rotating drive roller and the drive motor. In particular, the reaction forces exerted by the trailer wheel can be absorbed more effectively in the contact and driving position of the drive roller.

[0014] The motor shaft and the gearbox shaft are also arranged separately. They are coupled to each other via the intermediate drive. This offers structural advantages. The motor shaft and the gearbox shaft can be arranged parallel and with a lateral distance. Alternatively, a right-angled or oblique alignment of the motor and gearbox shafts is possible. The installation space in the preferably housing-like, hollow roller carrier can be optimally utilized.

[0015] The gearbox can provide a high reduction ratio between the high input speed of the drive motor and the low output speed of the drive roller. The gearbox can have one or more stages. The gearbox can be designed in various ways. A planetary gearbox, in particular, is advantageous. Alternatively, other gearbox designs are possible. The gearbox can be self-locking or non-self-locking.

[0016] The intermediate drive can be arranged on the roller carrier. It can be located essentially outside the drive roller. The intermediate drive can be designed in various ways. A belt drive is advantageous. This can be a friction-driven or, preferably, a positive-locking belt drive, in particular a toothed belt drive. The intermediate drive, especially in its belt drive configuration, offers advantages for vibration decoupling between the drive motor and the gearbox. A belt can also have damping properties.

[0017] The small size of the required installation space is also advantageous. The intermediate drive, in particular the belt drive, can be housed in a space-saving manner in the preferably housing-like roller carrier, especially in a support arm. It is also advantageous that the output element of the intermediate drive, e.g., a pulley or a gear, can have a smaller diameter than the drive roller, which is preferably arranged coaxially with it. The drive roller can project radially beyond the roller carrier and its preferably forked support arms in the feed direction. As a result, the roller carrier has no interfering contour when the drive roller is fed to the trailer wheel.

[0018] The drive unit can include a controllable braking device with a holding function for the drive roller. This offers particular advantages when the gearbox is designed without self-locking. The drive roller can be fixed in its contact position with the trailer wheel and, through the holding function, acts as a brake element, preventing unwanted rotation of the trailer wheel. The braking device can be located at a suitable point between the gearbox and the drive motor. An advantageous arrangement is between the gearbox and the intermediate drive. The braking device can also be located within the hollow drive roller.

[0019] The drive roller can be mounted and supported on the roller carrier by at least one roller bearing, e.g., a rolling bearing or a plain bearing. The drive roller can also be internally rotatable on a support tube fixed to the carrier. The drive roller bearing can be designed such that an intermediate stage of the transmission can be rotationally fixed to the roller carrier, particularly to the support tube.

[0020] The roller carrier can comprise a hollow support housing. The drive motor and preferably also the intermediate drive can be arranged within the support housing. A design of the roller carrier with fork-like support arms, between which the drive roller is arranged, is advantageous. It can also be advantageously rotatably mounted via the fork-like support arms and supported against reaction forces from the trailer wheel.

[0021] The drive unit can include a positioning device that moves the drive mechanism and positions it, along with the drive roller, against the trailer wheel, and can press it down if necessary. The positioning movement and direction can be translational and / or rotational. The drive mechanism can be moved back and forth between a retracted rest position and the driving position against the trailer wheel. This can be done manually, by foot, or by means of a motorized or other positioning drive.

[0022] A linear delivery function and design of the delivery device are advantageous. Equipping the delivery device with its own delivery drive is also beneficial. Alternatively, the delivery drive can be derived from the drive motor of the traction unit. The delivery device can include a console on which the roller carrier is adjustable in one delivery direction with suitable kinematics, preferably linear. The roller carrier can be coupled to the delivery drive in various ways. The delivery drive can be located in or on the console or in or on the traction unit. The delivery drive can, for example, include a controllable electric drive motor, particularly a DC motor.

[0023] The bracket can be attached to the vehicle trailer, particularly to its chassis, and can be designed accordingly. Attaching the bracket to a longitudinal member of the chassis, especially to a vertical center web of the longitudinal member, is advantageous. Alternatively or additionally, the bracket can be attached to a cross member, which in turn can be securely connected to the longitudinal member(s) in a suitable manner. A cross member can be positioned below the longitudinal members. It can also be inserted through the vertical center webs of the longitudinal members. In both cases, the cross member can project beyond the longitudinal members on both sides. In another variant, the cross member can be positioned between the longitudinal members and, via end plates, rest against a vertical center web of the longitudinal member and be securely connected to the bracket, particularly by bolting.

[0024] The drive unit can have a communication interface designed for communication with at least one controller and / or a remote control of the shunting drive. Communication can be wired and / or wireless. The at least one controller can be a central controller for the shunting drive or a distributed controller with control modules on the drive units of the shunting drive. The controller can actuate the drive motor and, if applicable, the drive unit's own delivery drive. The drive unit can also include one or more sensors, such as temperature sensors, speed sensors, displacement sensors, force sensors, or the like. These can also communicate with the at least one controller. The controller can control and, if necessary, regulate the direction and speed of travel of the drive unit.

[0025] The claimed drive unit can be part of a shunting drive. The shunting drive can comprise two or more, in particular four, drive units. These can include one or more left and one or more right drive units, each capable of acting on a left and a right trailer wheel of a single-axle or multi-axle road-legal trailer. The control system can, according to operator specifications, individually control and, if necessary, regulate the directions and speeds of the shunting drive units, as well as their relative positions, so that the shunting drive moves the trailer forward / backward, straight ahead, and in a selectable curve, and, if necessary, enables it to turn while stationary.

[0026] The described and claimed device features can be advantageously used in the claimed method. Conversely, the described and claimed method features can also be advantageously used in the claimed device(s).

[0027] The claimed drive unit and method can have the following configurations, each of which can be used individually or in combination.

[0028] The drive unit can have at least one drive mechanism. This mechanism can be controlled and movable, and can be positioned towards a trailer wheel. The drive mechanism can comprise a rotating drive roller that can be positioned towards a trailer wheel, a movable roller carrier, and a roller drive. The roller drive can include a drive motor and a gearbox connected to the drive roller and arranged completely or at least predominantly within the drive roller. The movable roller carrier can be positioned towards a trailer wheel.

[0029] The drive mechanism, particularly the roller drive, can comprise several gear stages. The drive mechanism, particularly the roller drive, can be designed as a planetary gear system. The planetary gear system can have one or more gear stages. Several gear stages can be arranged within the drive roller.

[0030] The drive motor and the gearbox of the drive unit, in particular the roller drive, can have parallel axes. The drive motor and the intermediate drive can also have parallel axes.

[0031] The braking device of the drive mechanism, in particular of the roller drive, can be arranged inside the drive roller.

[0032] The invention is illustrated in the drawings by way of example and partly schematically. Specifically, the drawings show: Fig. 1: A side view of a road trailer with a shunting drive and a drive unit, Fig. 2: A truncated top view of the trailer chassis and drive unit of Fig. 1 and Fig. 3: a truncated schematic representation of the drive unit.

[0033] The invention relates to a drive unit (2) for a shunting drive (1) of a road-legal vehicle trailer (3). The invention also relates to the shunting drive (1) and the road-legal vehicle trailer equipped therewith.

[0034] Fig. Figure 1 shows a side view of the vehicle trailer (3) with a drive unit (2) of a shunting drive (1).

[0035] The vehicle trailer (3) comprises a chassis (4) with one or more vehicle axles (36) and trailer wheels (7) on both sides. For example, in Fig. The vehicle axle (36), shown in abbreviated form, is designed, for example, as a trailing arm axle and comprises an axle tube extending across the width of the trailer with rotatable wheel links at the ends, each supporting a trailer wheel (7) at its free end. The trailer axle can be designed, for example, as the trailing arm axle shown or as a semi-trailing arm axle. It can also be designed as a stub axle or half axle, which is arranged multiple times on the chassis (4).

[0036] The chassis (4) comprises two or more longitudinal beams (5) with a front drawbar and a trailer coupling located at the front end of the drawbar. The longitudinal beams (5) are, for example, designed as thin-walled and bent sheet metal with an upright central web and a horizontally arranged upper and / or lower chord. The one or more vehicle axles (36) are attached to the longitudinal beams (5). The chassis (4) may also include one or more cross members (6). Any type of superstructure may be mounted on the chassis (4). The forward direction of travel of the vehicle trailer (3) is in Fig. 1 and Fig. 2 marked with an arrow.

[0037] The shunting drive (1) comprises two or more drive units (2), each assigned to a trailer wheel (7). In the illustrated embodiment of a single-axle vehicle trailer (3), a pair of two drive units (2) is provided, arranged on the left and right sides of the chassis (4). In a multi-axle vehicle trailer (3), with, for example, a tandem axle, one, two, or more pairs of drive units (2) may be provided.

[0038] The drive units (2) each have a drive device (8) and preferably also a delivery device (12).

[0039] The driving device (8) comprises a drive roller (9) that can be positioned against a trailer wheel (7), a movable roller carrier (11), and a roller drive (10) that rotates the drive roller (9). The roller drive (10) comprises a drive motor (21) and a gearbox (23) connected to the drive roller (9).

[0040] The drive motor (21) is, for example, a controllable electric drive motor, in particular a DC motor. It can also have any other suitable configuration. The drive unit can have one or more drive motors (21).

[0041] The transmission (23) is arranged completely or at least predominantly within the drive roller (9) in its hollow interior (19). The drive mechanism (8), and in particular the drive roller (9), is moved towards the trailer wheel (7) in the direction indicated by arrows. The movement and direction of movement are preferably translational and, in particular, linear.

[0042] The drive mechanism (8) and the drive roller (9) are moved between a rest position released from and retracted from the trailer wheel (7) according to Fig. 1 and Fig. 2 and a drive position on the vehicle wheel (7) according to Fig. 3 moved back and forth. In the driving position, the drive roller (9) is brought into driving contact with the trailer wheel (7), in which the rotational movement of the drive roller (9) can be transferred to the trailer wheel (7) and it rotates accordingly.

[0043] In the embodiment shown, the drive roller (9) is arranged according to Fig. 3. The drive roller (9) is pressed forcefully against the tread of a pneumatic tire of the trailer wheel (7). To transmit the rotary motion, the drive roller (9) has a suitably designed roller shell (17), which, for example, has a surface conducive to driving and friction. This surface can, for example, consist of axial ribbing or other projections and recesses for the preferably positive and non-positive transmission of the driving forces and movements from the rotating drive roller (9) to the trailer wheel (7). The drive roller (9) has, for example, a cylindrical shape and rotates about a central roller axis (18). The hollow drive roller (9) can be open at one end.

[0044] The transmission (23) can have any configuration. It can be single-stage or multi-stage. In the embodiment shown, it is configured as a planetary gear transmission, in particular as a planetary gear transmission. The transmission (23) can have a transmission shaft (24), which is preferably arranged concentrically to the roller shaft (18).

[0045] The transmission (23) is driven on its input side by a shaft (26), on which the input gear, in particular the sun gear, of the transmission (23) may also be arranged or formed. The shaft (26) can be rotatably mounted and supported by means of bearings (32) on the roller carrier (11) and in the drive roller (9), e.g., in a support tube fixed to the carrier. The output from the transmission (23) to the drive roller (9) can be via a planetary gear carrier, in particular a planet carrier, which is fixedly connected to the drive roller (9). Another part of the planetary gear set, in particular a planetary gear set, e.g., a ring gear, can be fixedly and rotationally supported on the roller carrier (11). For this purpose, a support tube (not shown) can be attached to the roller carrier (11), which projects into the hollow drive roller (9) at its end face and accommodates the transmission (23).The driven roller carrier, in particular a planet carrier, can be connected to an end plate of the drive roller (9), which is also coupled to an adjacent roller bearing (20) for rotatable support of the drive roller (9). The drive roller (9) can also be rotatably mounted and supported at its other end on the support tube.

[0046] The roller carrier (11) accommodates the drive roller (9) and the gearbox (23) on one side and the drive motor (21) on the other. The drive motor (21) is located externally and separately from the drive roller (9) on the roller carrier (11), and at a distance, e.g., laterally offset. The roller carrier (11) can have a hollow carrier housing (16) in the interior of which the drive motor (21) is protected.

[0047] The drive motor (21) drives the drive roller (9) via an intermediate drive (27), which is coupled to the drive motor (21) on one side and to the gearbox (23) on the other. The intermediate drive (27) is also located on the roller carrier (11), specifically in the carrier housing (16), and is substantially outside the drive roller (9). In the illustrated embodiment, the drive motor (21), which is located at a distance from the gearbox (23) on the roller carrier (11), and the gearbox (23) have parallel axes (22, 24) that are drivenly coupled to each other via the intermediate drive (27).

[0048] The intermediate drive is designed as a belt drive (28). Preferably, this is a positive-locking belt drive (28), in particular a toothed belt drive. The belt drive (28) comprises a driving pulley or gear (30) on the motor shaft or motor axle (22) and a driven pulley or gear (31) on the shaft (26) or the transmission axle (24). The pulleys or gears (30, 31) are coupled to each other by a belt (29), in particular a toothed belt. The intermediate drive (27) can have any suitable transmission ratio, e.g., a 1:1 ratio.

[0049] The drive roller (9) is mounted on the roller carrier (11) in a space between fork-like support arms (15). It can be rotatably supported on the roller carrier (11) via the aforementioned roller bearing (20), in particular on at least one support arm (15), and otherwise on the support tube.

[0050] The drive unit (2) can include a controllable braking device (25) with a holding function for the drive roller (9). When the drive roller (9) is in the driving position, the braking device (25) can lock the trailer wheel (7) and prevent the vehicle trailer (3) from rolling away.

[0051] The braking device (25) is arranged, for example, between the gearbox (23) and the intermediate drive (27). It can be located in the hollow interior (19) of the drive roller (9), in particular within the support tube. The braking device (25) can be designed in any suitable manner and can be controllable. It can, for example, be designed as a controllable magnetic brake. One braking element is supported in a manner fixed to the carrier and rotationally fixed to the roller carrier (11), in particular within the support tube, and another braking element is fixedly connected to the shaft (26) or the drive roller (9) or another rotatable part in or on the drive roller (9). A bearing (32) can be arranged in the drive roller (9) between the braking device (25) and the gearbox (23). The bearing (32) can, for example, be supported in a manner fixed to the carrier within the support tube. The other bearing (32) of the shaft (6) can be arranged differently from Fig. 3 also arranged in the support tube and supported rigidly by the beam.

[0052] The drive unit (8) is preferably moved translationally and linearly back and forth between the rest position and the drive position on the trailer wheel (7) by the aforementioned delivery unit (12). The delivery unit (12) can be designed and driven in any suitable manner.

[0053] In the illustrated embodiment, the delivery device (12) comprises a console and its own controllable delivery drive (14). The delivery drive (14) can be, for example, an electric motor or designed in another manner. The roller carrier (11) is preferably mounted on the console (13) so as to be linearly adjustable in the delivery direction and is coupled to the delivery drive (14). The delivery drive (14) can be arranged in the console (13) and / or in the drive unit (8), in particular in or on the roller carrier (11).

[0054] The console (13) can be attached to the vehicle trailer (3), in particular to its chassis (4), in a suitable manner. In the case of the Fig. In the embodiment shown in Figure 2, the console (13) is arranged and attached to the outside of an upright central web of the adjacent longitudinal beam (5). A supporting, preferably telescopic, crossbeam (6) can be arranged between the pair of left and right drive units (2). The crossbeam (6) can have end flange plates that bear against the inside of the upright central web of the longitudinal beams (5) and are firmly connected to the adjacent console (13) and said central web by means of screws or other fasteners.

[0055] In another and e.g. in Fig. In the embodiment shown in Figure 1, the crossbeam (6) can be arranged and attached to the underside of the longitudinal beams (5). In another embodiment, the crossbeam (6) can be inserted through openings in the upright central webs of the longitudinal beams (5) and attached to the surrounding central web wall via adapter plates or the like. In both embodiments, the crossbeam (6) can project outwards beyond the longitudinal beams (5) and be firmly connected at these points to a bracket of a delivery device (12).

[0056] The drive components of the drive unit (2), in particular the drive motor (21) and the feed drive (14), can be designed to be controllable. They can be equipped with at least one in Fig.1. The control unit (34) shown schematically is connected to the control unit. This can be, for example, a central control unit (34) to which several drive units (2) are connected. The drive units (2) can also include a single-part or multi-part sensor system (not shown), e.g., temperature sensors, speed sensors, force sensors, displacement sensors, and / or the like. The sensor system can also be connected to the control unit (34).

[0057] In another variant, not shown, the control system (34) can be distributed, with control components arranged at each drive unit (2) and communicating with each other. One of these control components can be configured as the master and the others as slaves.

[0058] The drive units (2) each have a communication interface (33). This interface can be used for communication with the at least one controller (34). The drive units (2) can also communicate with each other via the communication interfaces (33). Furthermore, communication with a preferably mobile remote control (35) of the shunting drive (1) is possible. The remote control (35) and the at least one controller (34) also have suitable communication interfaces (33'). Communication between the aforementioned communication interfaces (33, 33') can be wired and / or wireless, e.g., via radio, Bluetooth, infrared, or the like.

[0059] The shunting drive (1) may also include its own power supply (not shown), in particular an electric battery. The shunting drive (1) may also be connected to a trailer-side power supply, in particular an electric battery. REFERENCE MARK LIST 1 shunting drive 2 Drive unit 3 road-legal vehicle trailers 4 chassis 5 longitudinal beams 6 crossbeams 7 trailer wheel 8 Drive mechanism 9 drive roller 10 roller drive 11 roller carriers 12 Delivery equipment 13 console 14 Delivery drive 15 support arm 16 carrier housings 17 roller coat 18 roller axle 19 Interior 20 roller bearings 21 Drive motor 22 axle, motor axle 23 Gearboxes, planetary gearboxes 24 axle, gearbox axle 25 Brake system 26 wave 27 Intermediate shoot 28 Belt drive 29 Timing belts 30 gear 31 gear 32 storage areas 33 Communication interface 33' Communication interface 34 Control 35 Remote control 36 vehicle axle 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 2 138 387 A1

[0002] EP 2 208 661 A1

[0003] EP 3 552 932 A1

[0004] DE 20 2018 10 1924 U1

[0004] EP 1 394 024 A2

[0005]

Claims

[1] Drive unit for a shunting drive (1) of a road-going vehicle trailer (3), wherein the drive unit (2) comprises a drive device (8) which includes a rotatably driven cylindrical drive roller (9) with a central roller axle (18) that can be positioned against a trailer wheel (7) of the vehicle trailer (3), a movable roller carrier (11) and a roller drive (10), wherein the roller drive (10) comprises a drive motor (21) and a transmission (23) connected to the drive roller (9) and arranged completely or at least predominantly within the drive roller (9), wherein the drive motor (21) is arranged outside and separately from the drive roller (9) and drives the drive roller (9) via an intermediate drive (27) coupled to the transmission (23), wherein the intermediate drive (27) is arranged on the roller carrier (11) and substantially outside the drive roller (9), wherein - the transmission (23) comprises several transmission stages and / or the transmission (23) is designed as an epicyclic gear transmission, in particular as a planetary gear transmission, - wherein the drive motor (21) and the gearbox (23) have parallel axes (22, 24) and the gearbox (23) has a gearbox shaft (24) arranged concentrically to the roller shaft (18), characterized by , that the output from the gearbox (23) to the drive roller (9) is via a planetary roller carrier, in particular a planet carrier, which is firmly connected to the drive roller (9). [2] Drive unit according to the preamble of claim 1 or according to claim 1, characterized by , that a support tube is attached to the roller carrier (11), which projects into the hollow drive roller (9) at its end and accommodates the gearbox (23). [3] Drive unit according to the preamble of claim 1 or according to claim 1 or 2, characterized by, that the drive unit (2) has a controllable braking device (25) with a holding function for the drive roller (9), wherein the braking device (25) is arranged between the gearbox (23) and the intermediate drive (27). [4] Drive unit according to the preamble of claim 1 or according to claim 1, 2 or 3, characterized by , that the intermediate drive (27) is designed as a belt drive, preferably a positive-locking belt drive (28), in particular a toothed belt drive. [5] Drive unit according to the preamble of claim 1 or according to any one of claims 1 to 4, characterized by , that the drive unit (2) comprises a preferably linear delivery device (12) which is equipped with its own delivery drive (14) and which is designed to move the drive device (8) and deliver it to the trailer wheel (7). [6] Drive unit according to the preamble of claim 1 or according to any one of claims 1 to 5, characterized by, that the gearbox (23) is acted upon on the input side by a shaft (26) on which the input gear, in particular sun gear, of the gearbox (23) may also be arranged or formed, wherein the shaft (26) is rotatably mounted and supported by means of bearings (32) on the roller carrier (11) and in the drive roller (9), in particular in the support tube fixed to the carrier. [7] Drive unit according to one of the preceding claims, characterized by , that the driving roller carrier, in particular planet carrier, is connected to an end plate of the drive roller (9). [8] Drive unit according to one of the preceding claims, characterized by , that another part of the epicyclic gear system, in particular a planetary gear system, e.g. a ring gear, is supported on the roller carrier (11) in a manner that is fixed to the carrier and rotationally fixed. [9] Drive unit according to any one of the preceding claims, characterized by, that the drive roller (9) is mounted on the roller carrier (11) via at least one roller bearing (20). [10] Drive unit according to any one of the preceding claims, characterized by , that the end plate of the drive roller (9) is coupled to an adjacent roller bearing (20) for rotatable support of the drive roller (9). [11] Drive unit according to claims 2 and 10, characterized by , that the drive roller (9) is rotatably mounted and supported at the other end on the support tube. [12] Drive unit according to any one of claims 2 to 9, characterized by , that the drive roller (9) is internally rotatable on the support tube fixed to the support. [13] Drive unit according to claims 3 and 6, characterized by , that a bearing (32) is arranged in the drive roller (9) between the brake device (25) and the gearbox (23). [14] Drive unit according to claims 2 and 13, characterized by , that the bearing (32) is supported in the support tube in a beam-fixed manner. [15] Drive unit according to any one of claims 3 to 14, characterized by , that the braking device (25) in the driving position of the drive roller (9) on the trailer wheel (7) blocks the trailer wheel (7) and prevents the vehicle trailer (3) from rolling away. [16] Drive unit according to any one of claims 3 to 15, characterized by , that the braking device (25) is arranged inside the hollow drive roller (9). [17] Drive unit according to claims 2 and 16, characterized by , that the braking device (25) is arranged inside the support tube. [18] Drive unit according to any one of claims 3 to 17, characterized by , that the braking device (25) is designed as a controllable magnetic brake. [19] Drive unit according to any one of claims 3 to 18, characterized by, that a brake element is fixed to the carrier and rotationally fixed on the roller carrier (11), in particular in the support tube, and another brake element is fixedly connected to the shaft (26) or the drive roller (9) or to another rotatable part in or on the drive roller (9). [20] Drive unit according to any one of claims 4 to 19, characterized by , that the belt drive (28) comprises a driving pulley or gear (30) on the motor shaft or motor axle (22) of the drive motor (21) and a driven pulley or gear (31) on the shaft (26) or the transmission axle (24), wherein the pulleys or gears (30, 31) are coupled to each other by a belt (29), in particular a toothed belt. [21] Drive unit according to claim 20, characterized by , that the driven pulley or gear (31) has a smaller diameter than the coaxially arranged drive roller (9). [22] Drive unit according to any one of claims 5 to 21, characterized by, that the delivery drive (14) comprises a controllable electric drive motor, in particular a DC motor. [23] Drive unit according to any one of claims 5 to 22, characterized by , that the delivery device (12) comprises a console (13), wherein the roller carrier (11) is preferably linearly adjustable and mounted on the console (13) and coupled to the delivery drive (14), wherein the console (13) is designed to be attached to the vehicle trailer (3), in particular to its chassis (4). [24] Drive unit according to claim 23, characterized by , that the console (13) is designed to be attached to a longitudinal beam (5), in particular to an upright central web of the longitudinal beam (5), and / or to a crossbeam (6). [25] Drive unit according to claim 24, characterized by , that a crossbeam (6) is arranged below the longitudinal beams (5) and projects beyond the longitudinal beams (5) on both sides. [26] Drive unit according to claim 24, characterized by , that a crossbeam (6) is inserted through the upright central webs of the longitudinal beams (5) and projects beyond the longitudinal beams (5) on both sides. [27] Drive unit according to claim 24, characterized by , that a crossbeam (6) is arranged between the longitudinal beams (5) and rests against an upright central web of the longitudinal beams (5) via end plates and is firmly connected to the console (13), in particular by screws. [28] Drive unit according to any one of claims 5 to 27, characterized by , that the delivery drive (14) preferably comprising a controllable electric drive motor, in particular a DC motor, is located in or on the drive unit (8). [29] Drive unit according to any one of the preceding claims, characterized by, that the preferably electric and controllable drive motor (21), e.g. DC motor, of the roller drive (10) is arranged at a distance from the gearbox (23) on the roller carrier (11). [30] Drive unit according to one of the preceding claims, characterized by , that the roller carrier (11) comprises a hollow carrier housing (16) in which the drive motor (21) and preferably the intermediate drive (27) is arranged. [31] Drive unit according to one of the preceding claims, characterized by , that the roller carrier (11) comprises fork-like support arms (15) between which the drive roller (9) is arranged. [32] Drive unit according to one of the preceding claims, characterized by , that the drive unit (2) includes one or more sensors, e.g. temperature sensors, speed sensors, displacement sensors, force sensors or the like. [33] Drive unit according to one of the preceding claims, characterized by, that the drive unit (2) has a communication interface (33) which is designed for communication with at least one controller (34) and / or a preferably mobile remote control (35) of the shunting drive (1). [34] Drive unit according to claim 33, characterized by , that the control system (34) is distributed, with control components arranged at each drive unit (2) and communicating with each other. [35] Drive unit according to claim 34, characterized by , that one of the control components is configured as a master and the others are configured as slaves. [36] Drive unit according to claim 33, 34 or 35, characterized by that communication takes place via wired and / or wireless means. [37] Maneuvering drive for a road-legal vehicle trailer (3), wherein the maneuvering drive (1) comprises several drive units (2) that can be delivered to a trailer wheel (7) of the vehicle trailer (3), characterized by, that the drive units (2) are designed according to one of claims 1 to 36. [38] Shunting drive according to claim 37, characterized by , that the shunting drive (1) has at least one control unit (34). [39] Shunting drive according to claim 38, characterized by , that the at least one control (34) is a central control of the shunting drive (1) or a distributed control with control components on the drive units (2) of the shunting drive (1). [40] Shunting drive according to claim 38 or 39, characterized by , that the at least one control (34) supplies the drive motor (21) and the own delivery drive (14) of the respective drive unit (2). [41] Shunting drive according to claim 38, 39 or 40, characterized by , that the shunting drive (1) has a remote control (35) which preferably communicates wirelessly with the at least one control unit (34). [42] Shunting drive according to one of claims 38 to 41, characterized by, that the at least one control unit (34) according to operator specifications controls and, if necessary, regulates the directions of travel and travel speeds of the drive units (2) of the shunting drive (1) individually and also in relation to each other, so that the shunting drive (1) moves the vehicle trailer (3) in the desired direction of travel forwards / backwards, straight ahead and in selectable curve travel, and, if necessary, enables turning while stationary. [43] Shunting drive according to any one of claims 39 to 42, characterized by , that the shunting drive (1) includes its own power supply, in particular an electric battery. [44] Road-legal vehicle trailer comprising a chassis (4) with one or more vehicle axles (36) and trailer wheels (7) on both sides, and a shunting drive (1) with two or more drive units (2), each assigned to a trailer wheel (7), characterized by , that the shunting drive (1) is designed according to one of claims 37 to 43. [45] Vehicle trailer according to claim 44, characterized by , that in the case of a single-axle vehicle trailer (3) a pair of two drive units (2) are present and are arranged on the left and right sides of the chassis (4) or in the case of a multi-axle vehicle trailer (3) one, two or more pairs of drive units (2) are present. [46] Vehicle trailer according to claim 44 or 45, characterized by , that the chassis (4) comprises two or more longitudinal beams (5) with a front drawbar and a trailer coupling arranged at the front end of the drawbar. [47] Vehicle trailer according to claim 44, 45 or 46, characterized by that the one or more vehicle axles (36) are attached to the longitudinal beams (5). [48] ​​Vehicle trailer according to any one of claims 44 to 47, characterized by, that the longitudinal beams (5) are designed as thin-walled and bent sheets with an upright central web and a horizontally arranged upper chord and / or lower chord. [49] Vehicle trailer according to claim 48, characterized by , that the consoles (13) of the drive units (2) are arranged and fastened on the outside of the upright central web of the adjacent longitudinal beam (5). [50] Vehicle trailer according to claim 48 or 49, characterized by , that between a pair of left and right drive units (2) a supporting, preferably telescopic, crossbeam (6) is arranged, which has end flange plates which each bear against the inside of the upright central web of the longitudinal beams (5) and are firmly connected to the adjacent console (13) and the central web by means of screws or other fastening means.

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