GROUND MILLING MACHINE

Abstract

A ground milling machine comprising a machine frame, a driver's cab, a drive motor, movement means driven by the drive motor and a milling unit for milling up ground material, wherein the driver's cab has a protection roof and a front window device through which an operator located in the driver's cab can look forward in a forward direction of the ground milling machine.

Claims

1. A ground milling machine comprising: a machine frame; a driver's cab; a drive motor; movement means driven by the drive motor; and a milling unit for milling up ground material, wherein: the driver's cab has a protection roof and front window device through which an operator located in the driver's cab can look forward in a forward direction of the ground milling machine, wherein: the front window device comprises at least two front windows which in an operating position of the driver's cab are adjustable relative to each other along a linear thrust axis, running horizontally and transversely to the forward direction of the ground milling machine and are arranged overlapping each other in the forward direction of the ground milling machine.

2. The ground milling machine according to claim 1, wherein the at least two front windows are arranged one behind the other in the forward direction of the ground milling machine.

3. The ground milling machine according to claim 1, wherein at least one of the at least two front windows has a width: which corresponds to the maximum width of the ground milling machine or is smaller, in particular smaller than 90%, most particularly smaller than 80% of the maximum ground milling machines; and/or which corresponds to at least a width of 40%, in particular at least a width of 50% and very particularly at least a width of 60% of the maximum width of the ground milling machine.

4. The ground milling machine according to claim 1, wherein the at least two front windows can be adjusted relative to the rest of the driver's cab between a transport position and an extended position, wherein the maximum width of the front window device in the extended position is preferably greater than the minimum width of the front window device by at least a factor of 1.3, in particular by at least a factor of 1.4, and/or by at most a factor of 1.8, in particular by at most a factor of 1.7.

5. The ground milling machine according to claim 1, wherein the front window device has at least one of the following features: it comprises exactly two front windows, which are both adjustable relative to each other and/or relative to the rest of the machine frame, are linearly displaceable relative to each other, especially along an adjustment axis running horizontally and transversely to the forward direction; it comprises at least one front window arranged in a stationary manner in the operating position of the driver's cab; it comprises at least three front windows arranged at least partially next to one another, as seen in the forward direction of the ground milling machine, wherein the central front window in relation to the width of the machine is stationary in the operating position of the driver's cab.

6. The ground milling machine according to claim 1, wherein the front window arrangement has at least one of the following features: a sealing device is arranged between the at least two front windows; there is an adjustment path limiter in the form of an adjustment stop, with which the adjustment range of the at least two front windows relative to each other is limited; a locking device is provided, by means of which the at least one front window adjustable relative to the machine frame and/or relative to the at least one other front window can be locked relative to the machine frame and/or relative to the at least one other front window.

7. The ground milling machine according to claim 1, wherein the front window arrangement has at least one of the following features: a linear guide in the form of at least one or two guide rails, is provided, along which at least one adjustable front window can be displaced; a suspension guide is provided running along the vertical upper edge of the at least two front windows on a protection roof or on a supporting frame of a protection roof.

8. The ground milling machine according to claim 1, wherein the driver's cab has at least one of the following features: a protection roof is provided, wherein the protection roof preferably has at least one protection roof element which can be extended towards the side of the ground milling machine, wherein the protection roof element is preferably adjustable independently of the at least one adjustable front window; the driver's cab is adjustable between the operating position and a transport position with a reduced vertical height relative to the machine frame as compared to the operating position, wherein a safety device is provided which is designed in such a way that an adjustment into the transport position is only possible when the at least two front windows are in a defined fixed position or are at least free of protrusion relative to a protection roof and/or the machine frame; the driver's cab comprises at least one rear window, wherein the rear window is adjustable relative to the machine frame independently of the at least two front windows; the driver's cab comprises driver's cab extensions which can be extended to the side of the ground milling machine in a manner projecting beyond the outside of the machine frame, wherein at least one of the two front windows is adjustable relative to the machine frame independently of the driver's cab extensions.

9. The ground milling machine according to claim 1, wherein a lower body guard is provided, which is arranged in the forward direction of the ground milling machine approximately at the level of the front window arrangement and which, together with the front window, can be adjusted between a stowed position which is substantially free of protrusion relative to the rest of the ground milling machine and a raised position projecting to the side of the rest of the ground milling machine in such a way that it adjoins the at least one front window downwards in the vertical extension of at least one of the two front windows and preferably extends downwards to the driver's cab floor.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The invention will be explained in more detail below with reference to the exemplary embodiments detailed in the figures, which show schematically:

[0031] FIG. 1 a side view of a ground milling machine of the type in question;

[0032] FIG. 2A a perspective oblique view of a driver's cab with a window arrangement in the position pushed together;

[0033] FIG. 2B the view from FIG. 2A with the protection roof elements extended out and the front windows pulled apart from one another;

[0034] FIG. 2C the view from FIGS. 2A and 2B with the protection roof elements extended out and the front windows pushed together;

[0035] FIGS. 3A to 3C a plan view of a window arrangement with 2 front windows;

[0036] FIGS. 4A and 4B a plan view of a window arrangement with 3 front windows;

[0037] FIG. 5 an adjustment position corresponding to FIG. 2B with the lower body guard in the extended position;

[0038] FIG. 6A an enlarged detail of the cross-sectional region I from FIG. 5 with the protection roof in the operating position or pivoted up; and

[0039] FIG. 6B an enlarged detail of the cross-sectional region I from FIG. 5 with the protection roof in the transport position or pivoted down.

DETAILED DESCRIPTION

[0040] Like components are denoted in the figures with like reference signs, wherein not every component repeated in the figures is marked separately.

[0041] FIG. 1 shows a ground milling machine 1 of the type in question, specifically of the road milling type. The ground milling machine shown is a machine with a milling drum box arranged between the front and rear movement means 6 in the longitudinal direction or forward direction A, i.e. a so-called center-rotor machine. However, the invention is also applicable in particular to machines in which the milling drum box is positioned in the rear region of the machine. Essential elements of the ground milling machine are a driver's cab 2, from where an operator can control the ground milling machine, a machine frame 3, a drive motor 4, movement means 6 driven by the drive motor, specifically crawler tracks (although wheels can also be used), and a milling drum 9 (indicated by dashed lines) located in a milling drum box 7 and rotatable about a rotation axis 10 running horizontally and transversely to the working direction a, for milling up ground material of the ground surface 8. In working operation, the self-propelled ground milling machine 1 travels in the working direction a over the ground surface 8, dips with the milling drum 9 into the ground surface 8 with a milling depth and thereby mills up ground material in a manner known per se from the prior art. The milled-up ground material, i.e. the milled material, collects in the milling drum box 7 and is transported away during working operation by a conveying device 12 in a conveying direction F to a discharge point 15, preferably substantially continuously. From the discharge point 15, the milled material is then deposited on the ground surface, for example, or is loaded into a transport vehicle, in this case a vehicle travelling ahead.

[0042] The driver's cab 2 comprises a driver's cab floor 20, which is the standing surface for an operator located inside the driver's cab 2. The driver's cab 2 further comprises a protection roof 21, a front window arrangement 22 and preferably a rear window arrangement 23. The protection roof 21 together with the front window arrangement 22 and the rear window arrangement 23 can be lowered vertically downwards from the operating position shown in FIG. 1, for example for transport purposes. Further details, in particular regarding the structure of the front window arrangement 22, will become clear from the following figures.

[0043] FIGS. 2A to 2C all relate to an exemplary embodiment. Firstly, it can be seen that the front window arrangement 22 comprises a first front window 23 and a second front window 24. Together, these form an overall front window surface through which the driver located in the driver's cab 2 can look in the forward direction A. The two front windows 23 and 24 can be substantially the same size, in particular of identical design. The two front windows 23 and 24 are adjustable relative to each other in the horizontal direction and transversely to the forward direction A in the arrow direction B. This means that the total width of the two front windows 23 and 24 together can be varied. This is illustrated by a comparison of FIG. 2A, in which the two front windows are in a position substantially in line with the width of the driver's cab floor, and the positioning in FIG. 2B, in which the two front windows are in a position projecting sideways beyond the driver's cab floor or at least beyond the machine frame part located in front of the driver's cab. The two front windows 23 and 24 have thus been moved in the opposite direction to each other in the arrow direction B in each case towards their outer side. In the center, they are still positioned as before, overlapping each other.

[0044] Furthermore, the protection roof 21 comprises protection roof elements 25 and 26 which can be extended out to the side. These are pushed in towards the longitudinal center of the machine in FIG. 2A and extended to the side in FIGS. 2B and 2C. FIGS. 2A to 2C show that the two front windows 23 and 24 can be adjusted independently of the protection roof elements 25 and 26. However, they can also be functionally coupled.

[0045] FIGS. 3A to 5B are plan views in the vertical direction from above the driver's cab in highly simplified representation and show different variants of the front window arrangement 22. FIGS. 3A to 3C show an exemplary embodiment of the window arrangement 22 with a total of exactly two front windows 24 and 23. In FIG. 3A, the two front windows 24 and 23 are arranged so as to completely overlap each other when viewed in the forward direction A. They are also centered with respect to the width of the driver's cab floor 20. In FIG. 3B the two front windows 24 and 23 are shown in their maximum laterally extended position. Viewed in the forward direction A, a strip 27 acting as a sealing device and adjustment stop is provided between the two front windows 24 and 23. This strip may be stationary in relation to the machine frame or to one or both of the windows. FIG. 3C illustrates that a possibility for adjustment can also be provided so that both front windows 22 and 23 can be displaced to the same side.

[0046] In the exemplary embodiment according to FIGS. 4A and 4B, a front window arrangement 22 comprising a total of three front windows 23, 24 and 28 is illustrated. The two front windows 23 and 24 are arranged next to each other as seen in forward direction A. The front window 28 can be arranged in front of the two front windows 23 and 24 as seen in the forward direction A. It is also possible to position the front window 28 behind the two front windows 23 and 24, as illustrated in FIG. 4A with the reference sign 28′. In principle, all of the three or more front windows can also be arranged one behind the other in the forward direction A. One of the front windows can be stationary relative to the driver's cab floor 20 (at least in the operating position of the driver's cab). This is the case for the front window 28 in FIG. 4B.

[0047] Lastly, FIG. 5 corresponds substantially to the positioning of the individual elements according to FIG. 2B. In contrast to this, there is additionally provided a lower body guard 29, which, for example, adjoins the front window 24 vertically downwards. This guard can be adjustable together with or also independently of the front window 24. The guard is likewise preferably made of a transparent material, particularly preferably a break-proof plastic.

[0048] Starting from the cross-section detail indicated by “I” in FIG. 5, FIGS. 6A and 6B illustrate another optional but preferred design feature. Essential here is a shaft 31 (position indicated by dashed lines in FIG. 5), which extends linearly and horizontally from the right to the left side and thus perpendicularly to the forward direction A. On the one hand, this shaft acts as a linear guide device. For this purpose, each of the two windows 23 and 24 is suspended via a bearing bush 32 on this shaft 31 in the upper region of the corresponding window 23/24 in the vertical direction and can thus be displaced along the longitudinal axis of the shaft 31. At the same time, however, the bearing bush 32 can also be rotated about the longitudinal axis of the shaft 31 since the shaft 31 has a circular cross-section in the present case. This allows the shaft 31 and the bearing bushing 32 to simultaneously cooperate together also as a pivot joint about which the windows 23/24 can be rotated between the operating position of the protection roof 21 according to FIG. 6A and the pivoted-down transport position of the protection roof 21 according to FIG. 7B. Other arrangements can also be used here, such as a separate pivot joint between the bearing bush 32 and the corresponding front window 23/24. Such an articulation of the window on the protection roof 21 can also be selected for one or more rear windows of the ground milling machine.