Self-propelled large milling machine

Abstract

Self-propelled large milling machine, for milling a ground or traffic surface (8), with - a chassis comprising a steerable front axle (2) and a steerable rear axle (3) consisting of track drives (30) arranged under the machine frame (4) and connected to the machine frame (4) via lifting columns (32), - a machine frame (4) supported by the chassis with side outer walls (5a,5b) and a longitudinal central axis (52), - a milling drum (6) mounted on the machine frame (4) between the track drives (30) of the front axle (2) and the rear axle (3) at a distance from these, wherein the milling drum (6) extends with one end face to an outside of the machine frame (4) designated as the zero side (12) for edge milling, - a conveyor belt (48) that can swivel in height and sideways for removing the milled material at the front end of the large milling machine (1) and - a driver's cab (10) with a platform (15) for the driver above the milling drum, characterized in that the part of the machine frame (4) located on the zero side (12) is set back inwards in the direction of travel in front of the platform (15) for the driver in such a way that a recess (16) extending vertically, open to the outside as well as downwards and upwards, is formed in the machine frame (4), which extends downwards and forwards in the direction of travel.

Description

[0001] The invention relates to a self-propelled large milling machine, according to the preamble of claim 1 or 12.

[0002] Such road milling machines are already known in principle. For small milling machines where the milling drum is located at the level of the rear axle of the chassis and between the rear wheels, it is known to provide a recess on the zero side of the machine in the side outer wall, into which a rear support wheel or track drive can pivot.

[0003] Large milling machines, for example, road milling machines with a milling width exceeding 1200 mm, are referred to as large milling machines. These road milling machines are very heavy and are therefore usually supported by a chassis with tracked undercarriages. The milling drum is mounted on the machine frame between the tracked undercarriages of the front and rear axles, at a distance from them.

[0004] It is not common practice to include cutouts in the frame of large milling machines, as these machines do not have swiveling rear wheels or rear track systems. Therefore, there is no need to include a cutout in the machine frame of large milling machines.

[0005] Large milling machines have so far only been used for processing large areas, partly due to their limited maneuverability, although road curves with a large radius could also be processed depending on the road layout.

[0006] Especially during milling operations that curve inwards relative to the zero side, large milling machines present the problem that the operator cannot precisely follow a predetermined curve with a tight radius, as this is obscured by the machine frame. It is also difficult to follow a predetermined curve precisely, regardless of its direction, because the tracked undercarriage is located beneath the machine frame and does not allow for visual control of the steering angle.

[0007] DE 103 47 873 A1 describes a road milling machine with a driver's platform comprising a base plate and a steering device attached to the chassis of the road milling machine. The steering device has a console on which a steering wheel is mounted. According to the invention, one end of the console is attached laterally to the chassis, while the other end of the console is free. The console extends laterally above the base plate, forming an opening between the base plate and the console. Because an opening remains below the console, the driver can observe the road surface being milled without having to lean to the side, as is the case with conventional road milling machines where the side of the chassis obstructs the view due to the console's position.

[0008] US Patent 3,694,033 A discloses a machine for cutting grooves and intervening ridges in a roadway to accommodate reflective paint and act as a road divider. A self-propelled vehicle has a power transmission to rotate a cutter to cut the grooves to a predetermined depth as the vehicle moves along the roadway at a relatively slow speed. The cutting debris is flushed away by water from the road surface, which cools and cleans the cutter. A vacuum device draws the water and cutting debris from the road surface into a separation tank to separate air and mud. A mud pump transfers the mud into a container to further separate the cutting debris from the water.A drive motor and transmission, separate from the vehicle's normal drivetrain, can propel the vehicle at a relatively slow but variable speed during the cutting process, and at a higher speed when the vehicle's movement is reversed and the cutter is lifted from the road surface or otherwise detached. The separate drive motor and transmission are ineffective once the cutter is lifted from the road surface and the vehicle's normal drivetrain is engaged to allow the vehicle to travel on the highway at normal traffic speeds.

[0009] US 6,210,071 B1 describes a method and apparatus for cutting rumble strips into the surface of a roadway. The apparatus is a self-propelled machine comprising a frame and a drive mechanism mounted on the frame for advancing the machine across the roadway surface. The machine also includes a generally cylindrical cutting drum mounted on the frame for rotation about an axis generally parallel to the roadway surface. Several cutting teeth are mounted on the outer surface of the drum in a predetermined pattern, and a mechanism is provided for rotating the cutting drum about its axis.The drum is held in a predetermined position relative to the road surface, allowing the cutting teeth to cut a relatively constant, predetermined depth into the surface as the drum is rotated around its axis while the machine is advanced along the road surface. As the drum rotates around its axis while remaining in the predetermined position relative to the road surface, the cutting teeth cut a series of parallel, spaced rumble strips into the road surface. This improved machine is capable of performing a smooth and continuous cutting operation while being advanced along the road surface at a higher speed and without the vibrations characteristic of other known machines.

[0010] The underlying task is to create a self-propelled large milling machine that is more universally applicable and has improved maneuverability.

[0011] The features of claim 1 and 12 serve to solve this problem.

[0012] The invention advantageously provides that the part of the machine frame located on the zero side is set back inwards in the direction of travel in front of the platform for the driver, such that a recess extending vertically, open to the outside as well as downwards and upwards, is formed in the machine frame, which widens downwards and forwards in the direction of travel.

[0013] The invention enables improved maneuverability in road milling machines where the milling drum is arranged between the tracks or wheels of the front and rear axles, particularly when traveling in left-hand directions, when the zero side is located on the right side of the machine with respect to the direction of travel. The recess, which widens downwards and forwards in the direction of travel, makes it possible not only to follow a tight inward turning radius but also to directly observe the steering angle of the front axle, independent of the direction of travel.

[0014] The recess, which widens downwards and forwards in the direction of travel, has the advantage of minimizing the machine's overall volume in front of the driver's cab. This is important because the front structure typically houses a water tank, and the recess reduces the tank's volume as much as possible. For example, the downward-sloping, forward-facing section of the recess is positioned so that the driver, whether seated or standing, can still see the steering position of the front track or wheel.

[0015] The wall section defining the recess therefore follows the operator's line of sight. This ensures that, on the one hand, the operator has improved visibility, leading to better maneuverability of the road milling machine, and on the other hand, the tank volume is not unnecessarily reduced.

[0016] Previously, tighter curve radii could hardly be achieved with road milling machines with a milling width exceeding 1000 mm, meaning that such curve radii, frequently encountered in roundabouts, for example, had to be machined with a different, specialized road milling machine. The invention now makes it possible to significantly improve the maneuverability of road milling machines with a milling width exceeding 1000 mm, so that different road milling machines no longer need to be used for specific road construction projects. The invention is particularly advantageous for road milling machines with a milling width between 1000 and 2200 mm, preferably between 1200 mm and 1500 mm, and expands their range of applications.

[0017] According to a further development of the invention, it is advantageously provided that the driver's seat is aligned with the side outer wall above the milling roller arranged in the direction of travel between the axles and at a distance from them, such that the driver's seat partially projects laterally over at least the front part of the side outer wall.

[0018] Positioning the operator's seat in this outward position improves visibility of the area in front of the milling drum and of the track assembly of the front axle on the zero side. The design of the recess allows a marker line extending inwards from the zero side to be followed for a considerable distance, enabling precise steering of the road milling machine along this line. Maneuverability is further enhanced by the simultaneous monitoring of the steering position of the front axle.

[0019] The driver's seat can be positioned with its vertical central plane running in the direction of travel in the plane of the side outer wall, or essentially parallel to it with a small lateral distance.

[0020] The recess has an inner wall section in its horizontal cross-section that runs essentially parallel to the direction of travel.

[0021] Alternatively, the inner wall section can also run diagonally to the direction of travel, starting from the front edge diagonally to the point of the roller box that lies on the zero side in the vertical plane of the end face of the milling roller or to the rear outer wall.

[0022] Adjacent to this inner wall section at the front, the recess can have at least one wall section running diagonally downwards from the driver's seat in the direction of travel, which leads towards the zero side into the plane of the lateral outer wall.

[0023] The adjacent wall section can also run diagonally forwards with respect to a vertical plane running in the direction of travel.

[0024] A steering console with a steering wheel can be mounted laterally on the machine frame in front of the operator's seat. The operator's seat can be height-adjustable and / or movable laterally to the direction of travel within the operator's platform.

[0025] In an alternative embodiment, the rear chassis axle can be formed by only a single track assembly.

[0026] The driver's platform is preferably located above the axis of the milling drum.

[0027] In a further development of the invention, a mirror can be arranged in the area of ​​the recess, allowing observation of a marking for the vertical plane of the zero-side end face of the milling drum, e.g., on the front of the drum housing, even when the operator is seated in the driver's seat. A marking, e.g., one or two vertical lines, indicating the position of the zero-side end face of the milling drum, is provided near the zero-side end of the drum housing or on another machine part within the recess, which may also be connected to the side panel. The manually or motor-adjustable mirror enables the operator, while seated in the driver's seat, to observe this marking and / or the area of ​​the ground or traffic surface in front of the drum housing.

[0028] Simultaneously, the recess is designed so that the front, zero-side running gear can still be seen even when seated. Preferably, the mirror is adjustable so that the driver, in a seated position, can observe both the front edge of the roller housing and the marking lines on the road surface. The running gear facing the zero side is also directly visible when seated. According to a preferred embodiment, the mirror, preferably arranged on the front wall section of the recess, intersects the vertical plane of the zero-side end face of the milling drum and has markings, preferably marking lines, which can be aligned with a predetermined marking line on the ground or road surface via a sighting device.

[0029] The aiming device consists preferably of linear devices, in particular cables or rods, running parallel to the ground or traffic surface, which run in the vertical plane of the zero-side end face of the milling drum preferably between the outer wall sections or enclose this vertical plane between themselves.

[0030] Using the mirror and sighting device, the operator can check whether the current steering position of the road milling machine follows the designated marking line on the ground. To do this, he must align the markings in the mirror with the marking line on the ground using the sighting device and can then determine whether the road milling machine is on the designated milling track.

[0031] A further development of the road milling machine involves a projection device that projects a light marking onto the ground or road surface. This marking, aligned with a predetermined line on the road surface, indicates the current path of the milling edge on the zero-side face of the milling drum in the direction of travel, in front of the drum housing, depending on the position of the machine frame. No sighting device is required, as the marking on the ground or road surface and the light marking are in the same plane. The markings on the ground or road surface can be directly compared using a mirror while seated or standing.

[0032] A preferred embodiment of the further development consists in the light marking indicating the further course of the milled edge as a function of the current steering angle of the chassis. For this purpose, a computer calculates the course of the milled edge as a function of the steering angles of the rear and front chassis and displays this on the ground or traffic surface via the projection device.

[0033] A sensor device can detect the position of the light marking in relation to the specified marking line, whereby a control system can automatically regulate the steering of the chassis depending on the signals from the sensor device.

[0034] The projection device is preferably located on or below the driver's seat or platform.

[0035] In the following, exemplary embodiments of the invention are explained in more detail with reference to the drawings.

[0036] They show: Fig. 1 a partial view of a large milling machine according to the invention, Fig. 2 a top view of the driver's platform of the large milling machine, and Fig. 3 an embodiment with a direction finding device and / or projection device.

[0037] Fig. Figure 1 shows a road milling machine 1, in particular a large milling machine with a machine frame 4 and a chassis with a steerable front axle 2, as well as with a rear axle 3 that is also steerable. The chassis is connected to the machine frame 4 via lifting columns 32, with the help of which the distance of the machine frame 4 from a ground or traffic surface 8 can be adjusted.

[0038] At the front end of the road construction machine, a conveyor belt 48, which can be swivelled in height and sideways, is arranged for the removal of the milled material.

[0039] The front axle 2 and the rear axle 3 of the chassis can each consist of two track assemblies 30 and / or two wheels.

[0040] The machine frame 4 has lateral outer walls 5a, 5b that run essentially vertically and parallel to the longitudinal center axis of the road milling machine 1. It is understood that the outer walls do not have to run strictly vertically and absolutely parallel to the longitudinal center axis of the road milling machine 1, but that minor deviations are possible. The outer wall is preferably manufactured in one piece, with the outer wall sections 5a, 5b preferably lying in one plane.

[0041] Between the track drives 30, a milling drum 6 with a milling drum axle 7 mounted on the machine frame 4 is arranged for milling the floor or traffic surface 8. The milling drum 6 extends with one end face to the outer side of the machine frame 4, designated as the zero side 12, while a drive unit for the milling drum 6 is arranged on the opposite outer wall of the machine frame 4.

[0042] On the end face of the milling roller 6 facing the zero side 12 and next to the roller box 41, a height-adjustable side plate 40 is arranged, which serves as edge protection.

[0043] The milling drum 6 is preferably arranged centrally between the front axle 2 and the rear axle 3.

[0044] Above the milling drum 6 is the driver's platform 10 with a seat 14 for the driver arranged on the zero side 12.

[0045] The seat 14 is preferably oriented towards the side outer wall 5a,5b in such a way that the seat 14 projects at least partially laterally towards the outer wall 5a,5b; this applies in particular to the front outer wall 5a if the latter should not be in a plane with the rear outer wall 5b.

[0046] Seat 14 is height-adjustable and can also be moved laterally to the direction of travel. Seat 14 can be positioned with its vertical central plane running in the direction of travel in the plane of the side outer wall 5a, 5b, or parallel to it with a small lateral gap.

[0047] If the road milling machine is moved along an obstacle with the zero side, e.g. a mast, the seat 14 with the armrest 42 and the control panel 44 can be moved inwards to allow milling as flush as possible past the obstacle.

[0048] Next to the driver's seat, towards the center of the machine, a control panel 34 and a device 36 for setting the machining parameters are provided.

[0049] A steering console 24 is rotatably mounted laterally on the machine frame 4 about a horizontal axis, so that the position of a steering wheel 26 can be adjusted. The driver's station 10 has a platform 15 as a standing surface for the operator, which is sloped towards the zero side and to the rear in order to improve the view of the roller housing 41 in front of the milling drum 6, in particular of the front 41a of the roller housing 41 surrounding the milling drum 6 on the zero side.

[0050] The roller box 41 can have a marking on the front 41a, e.g., consisting of one or two vertical lines, which indicates to the driver the position of the front edge of the milling roller 6 on the zero side.

[0051] In Fig. 2 The engagement area of ​​the milling drum 6 at a specific milling depth is shown by way of example by the hatched area.

[0052] The machine frame 5 indicates, at the height of the front outer wall 5a, how best to Fig. Figure 1 shows a recess 16, which is bounded to the inside of the road milling machine and to the front by wall sections 18 and 20. Fig. 1 shows the viewing angle that the driver has from his driver's seat 10.

[0053] Wall section 20 runs at an angle forward in the direction of travel and merges into outer wall 5a.

[0054] The recess 16 allows observation of the front right track assembly and thus observation of the current steering angle. The angle of inclination of the wall section 20, measured from above, to a vertical plane running transversely to the direction of travel can, for example, be between 20° and 50°, preferably 30° to 40°.

[0055] The inner wall section 18 runs essentially parallel to the longitudinal centerline of the road milling machine. Wall section 18 is preferably vertical, but can also be inclined inwards, for example, up to 20° from the vertical, when viewed towards the ground or traffic surface 8. The wall section 20 adjoining wall section 18 at the front can additionally run obliquely forwards with respect to the outer wall 5a, for example, at an angle of 120° ± 70°, preferably 120° ± 10°.

[0056] The recess 16 is further limited to the rear by a wall section 19, which extends essentially vertically from the platform 15 of the driver's cab 10 downwards to the roller box 41.

[0057] Wall section 19 can also be omitted if wall section 18 does not run parallel to the direction of travel from its front edge, but rather diagonally towards the marking on the front edge 41a of the roller box 41. Alternatively, wall section 18 can also terminate in the rear outer wall 5b in the area of ​​the roller box 41.

[0058] Lines 17a, 17b, and 17c represent markings on the ground or traffic surface 8 that indicate the desired route. Marking 17a indicates a straight-ahead route, while markings 17b and 17c indicate different curve radii when the road milling machine 1 is steered to the left and inwards, respectively. Fig. 2. It is evident that, due to the recess 16, the driver on the operator's platform 10 can observe the marking lines 17b and 17c to a much greater extent than if the recess 16 were not present and the machine frame 4 extended along the outer wall 5a to the platform 15 without the recess 16. It is understood that when cornering along the marking lines 17b or 17c, the track drive 30 is pivoted in such a way that it does not obscure the marking lines 17b or 17c. Furthermore, the recess 16 allows the driver to observe the steering angle of the front track drive 30, so that the road milling machine can be steered precisely according to the predetermined road alignment, with the driver, for example, guiding the marker on the front 41a of the roller box 41 along the marking lines 17a, 17b, or 17c.

[0059] The special design of the recess 16 not only allows an improved possibility to trace the marking lines 17b or 17c while simultaneously observing the steering angle of the front axle, but also ensures that the volume of the tank 50 located above the front axle is not unnecessarily reduced.

[0060] How, in turn, is the best way to proceed? Fig. As can be seen in Figure 1, the tank volume of tank 50 is only slightly reduced by the recess 16, particularly because of the sloping wall 20.

[0061] It is understood that the recess 16 can also be arranged in a corresponding manner on the side of the machine facing away from the zero side 12, in addition to the recess 16 provided on the zero side 12. The design of this additional recess 16 can be mirror-symmetrical to the recess 16 on the zero side, with respect to a longitudinal center axis 52 of the road milling machine 1.

[0062] Fig. Figure 3 shows an embodiment of a road milling machine 1, which may be equipped with a mirror 54, a sighting device 58 and / or a projection device 62.

[0063] The mirror 54, which can be arranged, for example, on a substantially vertical surface 64 in the area of ​​the recess 16, is manually or motor-adjustable and can also consist of a convex mirror. The mirror is arranged such that it projects beyond the plane of the end face of the milling drum 6 towards the zero side.

[0064] Out of Fig.Figure 3 schematically depicts the driver's field of vision when seated in the vehicle seat 14. The driver's field of vision then encompasses a wide area in the direction of travel in front of the roller housing 41 via the mirror 54. In particular, the driver can observe the marking on the front 41a of the roller housing 41 or on another machine element, which indicates the vertical plane of the end face of the milling drum 6. The mirror 54, which may also be convex, also allows the driver to observe the current marking lines 17a, 17b, or 17c on the road surface 8. For improved bearing, the mirror 54 may have markings 56, e.g.,a line running in the plane of the front face of the milling drum 6, or two parallel lines spaced apart from each other, running parallel to each other and taking up the vertical plane of the front face of the milling drum 6 between them, which the driver must align with a sighting device 58 and with one of the marking lines 17a, 17b or 17c on the ground and traffic surface 8 for sighting purposes.

[0065] The sighting device 58 can, for example, consist of two ropes stretched between the outer wall sections 5a, 5b, which run parallel to each other and hold the vertical plane of the end face of the milling drum 6 between them.

[0066] Alternatively, the sighting device 58 can also consist of a single cable running in the plane of the end face of the milling drum 6. The mirror 54, in combination with the sighting device 58, therefore allows the road milling machine 1 to be maneuvered from a seated position.

[0067] Independently of the mirror 54 and the sighting device 58, a projection device 62 can also be provided, which emits a light beam focused on the ground or traffic surface 8. This beam, in the form of a series of dots or a line, indicates the course of the zero-sided milling edge, preferably depending on the current steering setting. The projection device 62 thus operates in the manner of a laser pointer, generating a series of dots or a line. The light beam can be a laser beam.

[0068] A computer 60 calculates the path of the milling edge in the direction of travel in front of the roller box 41 and controls the laser projection device 62 accordingly. The calculation is based on the steering angle of the front and / or rear chassis axle. It is understood that the chassis can also be steered in opposite directions to follow a specific, predetermined curve, as defined by the marking lines 17a, 17b, or 17c on the ground or road surface 8. The driver can determine whether the current steering angle follows the desired curve by comparing the projected laser light line with the applied marking lines 17a, 17b, or 17c.

[0069] A further development of this light projection device consists in a sensor device that detects the difference between the projected line and the predetermined marking line 17a, 17b or 17c, whereby the steering of the road milling machine 1 is automatically controlled by means of a control 66.

Claims

[1] Self-propelled large milling machine, for milling a ground or traffic area (8), with - a chassis having a steerable front axle (2) and a steerable rear axle (3) comprising tracked drives (30) arranged under the machine frame (4) and connected to the machine frame (4) via lifting columns (32), - a machine frame (4) carried by the chassis with lateral outer walls (5a, 5b) and a longitudinal central axis (52), - a milling drum (6) mounted on the machine frame (4) between the track drives (30) of the front axle (2) and the rear axle (3) at a distance therefrom, the milling drum (6) extending with a front side up to an outer side of the machine frame (4) designated as the zero side (12) for milling close to the edge, - a conveyor belt (48) which can be pivoted vertically and laterally for transporting the milled material away from the front end of the large milling machine (1) and - a driver's cab (10) with a platform (15) for the driver above the milling drum, characterized by ,that the part of the machine frame (4) located on the zero side (12) springs back inwards in front of the platform (15) for the vehicle driver in the direction of travel in such a way that a recess (16) running in the vertical direction, open towards the outside as well as downwards and upwards is formed in the machine frame (4), which widens downwards and forwards in the direction of travel. [2] Large milling machine according to claim 1, characterized by that the driver's cab (10) has a seat (14) for the driver, and that the driver's seat (14) is aligned with the lateral outer wall (5a, 5b) above the milling drum (6) arranged between the axles (2, 3) in the direction of travel and at a distance from these, in such a way that the driver's seat (14) partially projects laterally beyond at least the front part (5a) of the lateral outer wall (5a, 5b). [3] Large milling machine according to claim 2, characterized by that the driver's seat (14) runs with the vertical center plane of the seat (14) running in the direction of travel in the plane of the lateral outer wall (5a,5b) or with a small lateral distance parallel to it. [4] Large milling machine according to claims 1 to 3, characterized by that the recess (16) has, in horizontal cross-section, an inner wall section (18) running substantially parallel to the direction of travel. [5] Large milling machine according to claim 4, characterized by that the recess (16) has at least one adjacent wall section (20) which runs obliquely downwards from the driver's cab (10) in the direction of travel and which opens into the plane of the lateral outer wall (5a) towards the zero side. [6] Large milling machine according to claim 5, characterized by that the adjacent wall section (20) also extends obliquely forwards with respect to a vertical plane running in the direction of travel. [7] Large milling machine according to one of claims 2 to 6, characterized by that a steering console (24) with a steering wheel (26) is mounted laterally on the machine frame (4) in front of the driver's seat (14). [8] Large milling machine according to one of claims 1 to 7, characterized by that the rear chassis axle (3) is formed by only a single track drive (30). [9] Large milling machine according to one of claims 1 to 8, characterized by that the driver's cab (10) is arranged at a distance from the chassis axes (2,3) above the axis (7) of the milling drum (6). [10] Large milling machine according to one of claims 1 to 9, characterized by that the outer wall (5a) is provided on the outer side facing away from the zero side with a recess corresponding to the recess (16) substantially mirror-symmetrically relative to the longitudinal central axis (52). [11] Large milling machine according to one of claims 1 to 9, characterized bythat the outer wall (5a) is provided on the outer side facing away from the zero side with a recess corresponding to the recess (16) which is open towards the outside as well as downwards and upwards. [12] Self-propelled large milling machine (1) for milling a ground or traffic area (8) along marking lines (17a, 17b, 17c), with - a chassis having a steerable front axle (2) and a steerable rear axle (3) comprising tracked drives (30) arranged under the machine frame (4) and connected to the machine frame (4) via lifting columns (32), - a machine frame (4) carried by the chassis with lateral outer walls (5a, 5b) and a longitudinal central axis (52), - a milling drum (6) mounted on the machine frame (4) between the track drives (30) of the front axle (2) and the rear axle (3) at a distance therefrom, the milling drum (6) extending with a front side up to an outer side of the machine frame (4) designated as the zero side (12) for milling close to the edge, - a conveyor belt (48) which can be pivoted vertically and laterally for transporting the milled material away from the front end of the large milling machine (1) and - a driver's cab (10) with a platform (15) for the driver above the milling drum, characterized by,that the part of the machine frame (4) located on the zero side (12) springs back inwards in front of the platform (15) for the vehicle driver in the direction of travel in such a way that a recess (16) running in the vertical direction and open towards the outside as well as downwards and upwards is formed in the machine frame (4), wherein a mirror (54) is arranged in the region of the recess (16) which allows observation of a marking for the vertical plane of the zero-side end face of the milling drum (6) even when the vehicle driver is sitting on the driver's seat (14) in such a way that the large milling machine can be steered along the marking lines (17a, 17b, 17c) using the marking. [13] Large milling machine according to one of claims 2 to 11, characterized bythat a mirror (54) is arranged in the region of the recess (16), which allows observation of a marking for the vertical plane of the zero-side front side of the milling drum (6) even when the vehicle driver is sitting on the driver's seat (14). [14] Large milling machine according to claim 12 or 13, characterized by that the mirror (54) is adjustable such that the driver in the sitting position can observe both the front edge (41a) and a predetermined marking line (17) on the ground or traffic surface. [15] Large milling machine according to one of claims 12 to 14, characterized by that the mirror (54) arranged in the region of the recess (16) intersects the vertical plane of the zero-side end face of the milling drum (6) and has markings, preferably marking lines, which can be aligned with a predetermined marking line (17a, 17b, 17c) on the ground or traffic surface (8) via a direction-finding device (58). [16] Large milling machine according to claim 15, characterized by that the direction-finding device (58) consists of linear devices, in particular cables or rods, which preferably run parallel to the ground or traffic surface (8) and which run in the vertical plane of the zero-side end face of the milling drum (6) preferably between the outer wall sections (5a, 5b) or enclose them between them. [17] Large milling machine according to one of claims 1 to 16, characterized by that a projection device (62) projects a light marking onto the ground or traffic surface (8) which is to be aligned with a predetermined marking line (17) on the ground or traffic surface (8), which light marking linearly indicates the currently set future course of the milling edge on the zero-side end face of the milling drum (6) in the direction of travel in front of the drum box (41). [18] Large milling machine according to one of claims 1 to 16, characterized bythat a projection device (62) projects a light marking onto the ground or traffic surface (8) which is to be aligned with one of the predetermined marking lines (17a, 17b, 17c) on the ground or traffic surface (8), which light marking indicates the currently set future course of the milling edge on the zero-side end face of the milling drum (6) in the direction of travel in front of the drum box (41) as a function of the current steering angle of the chassis. [19] Large milling machine according to claim 18, characterized by that a computer (60) calculates the future course of the milling edge as a function of the steering angles of the rear and front wheel or chain drives (30) and displays it on the ground or traffic surface (8) via the projection device (62). [20] Large milling machine according to claim 18 or 19, characterized bythat a sensor device detects the position of the light marking in relation to one of the predetermined marking lines (17a, 17b, 17c) and that a controller (64) automatically regulates the steering of the chassis in dependence on the signals from the sensor device. [21] Large milling machine according to one of claims 18 to 20, characterized by that the projection device (62) is arranged on or below the driver's seat (14) or the platform (15).

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