Road milling machine with steering device

p0001The present invention relates to a road milling machine having a platform, having a bottom plate and a fixed to the chassis of the construction machine steering device, comprising a console on which a steering wheel is arranged.

p0002There are road milling machines known to the chassis, a platform is provided. The operator's platform can accommodate the driver by a bottom plate is provided on the driver is. For most of driver's cabs are used, is on the bottom plate is additionally provided a seat for the driver, so that it can put in a longer processing the main traffic area.

p0003The steering device of the known road milling machines generally comprises a console on which the steering wheel is arranged. The console is facing on a cabin floor, closed exported side of the chassis arranged. The steering itself is usually done via a hydraulic.

p0004When processing a traffic area with a road milling machine, it is often necessary that the driver the road surface to be machined reserves closely. So the road milling machine has, for example, often a layer applied to the road surface marking followed so that the driver must always monitor the precise ride the road milling machine along the marking. Even when processing a traffic area along a boundary stone or a manhole cover around the driver must always monitor the position predetermined by the above obstacles limit the machined surface transport.

p0005The known road milling machines have the disadvantage that the monitoring and observation of the processed traffic area of ​​the operator's platform is difficult.

p0006From the <patcit id="pcit0001" dnum="US3895843A"><text>US 3895843</text></patcit> is a road milling machine is known whose milling tool is arranged in the direction of travel in front of the driver's cab. The milling tool is partially visible from the driver's cab through a recess in the base plate. A disadvantage is that the view of the console with the instruments and extending from the bottom plate upwardly extending steering column is hindered. In addition, the driver's leg is obstructed.

p0007In the<nplcit id="ncit0001" npl-type="s"><text> Brochure "Cold milling machine W 600 DC" May 2001 (2001-05, Wirtgen GmbH, Deutschl</text></nplcit>and, XP002383165) describes a cold milling machine that has a arranged at the rear of the router platform with a driver's seat and a base plate. In front of the driver's seat, a console is mounted above the base plate of the milling machine on the chassis, on which a steering wheel is arranged. The driver's seat and the steering wheel can adjust the driver of the milling machine to its height in order to always have the milling edge in sight. The steering device of the known milling machine is designed as a hydraulic steering system, which controls (hydraulic unit) are arranged within the chassis.

p0008The <patcit id="pcit0002" dnum="US3362247A"><text>US-A-3,362,247</text></patcit> describes the platform of an agricultural machine, comprising a driver's seat and an adjustable steering wheel in height. The steering wheel sitting on a steering housing which receives the hydraulic steering. The steering housing is connected via a bent steering column which is oriented substantially horizontally with a housing which accommodates the control elements. By twisting the bent steering column, the steering wheel can be adjusted in height.

p0009The present invention is based on the object to provide a road milling machine, which makes it easy and convenient observation of the processed traffic area of ​​the operator's platform.

p0010This object is inventively with the features of claim 1. An advantageous embodiment of the road milling machine according to the invention is the subject of the dependent claim.

p0011The road milling machine according to the invention comprises a platform, which is provided with a bottom plate. On this bottom board, the driver can stand or sit, unless a corresponding seat is mounted on the bottom plate. On the chassis of the road milling machine, a steering device is attached, which is used for steering, for example, a wheel, the wheels of one axle or chain drives on which a road milling machine is usually supported. The steering device includes a console and a steering wheel arranged thereon. Under a steering wheel is to be understood in this context, any manually operable steering means. According to the panel with one end secured side of the chassis. The term laterally refers here to the direction of travel. Starting from the fixed end extending the console above the bottom plate to form an opening between the base plate and the console to the side. above, the term is to be understood here is that the console is positioned higher than the bottom plate. An immediate arrangement of the console to the base plate is not required. The other end of the bracket forms a free end.

p0012Through the remaining under the bracket opening, the vehicle driver has the possibility to observe the to be processed traffic area, without having to stretch to the side must, as is the case with conventional road milling machines, in which the side of the chassis blocks the view, in which console is arranged. In addition, causes the one-sided mounting of the console, that a free end of the console is formed, which does not need to be supported downwardly relative to the chassis, so that no obstructing the view of supporting means is required at this end. Moreover, the opening below the console to the driver ensures greater legroom. The recess of the bottom plate through which the driver recognizes the road surface, can either extend only over a part or the entire length of the bottom plate.

p0013The console of the road milling machine according to the invention does not need to be arranged laterally on the outermost side wall of the chassis, but may also displaced inwards be arranged in the direction of travel behind a part of the chassis. In a particularly advantageous embodiment of the road milling machine, the console is offset inwardly, wherein the chassis in the direction of travel in front of the opening is recessed, that the road surface is visible. So a small overall width of the road milling machine is both achievable because the console does not protrude beyond the outermost side wall of the chassis, on the other hand, the road surface to be machined is still clearly visible.

p0014In the case of the road milling machine according to the invention the steering wheel can be pivoted about the longitudinal axis of the console. Thus the position of the steering wheel can be adjusted according to whether the driver the road milling machine operated standing or sitting.

p0015In addition, the steering wheel can be swiveled together with the console. Preferably more operating and / or display elements are arranged, their relative arrangement is retained to the steering wheel, so that the operation is simplified to the console.

p0016To ensure safe handling in different pivot positions of the steering wheel, the steering wheel can be locked in different pivot positions. Such locking can allow a stepwise or continuous adjustment of the pivot position.

p0017The road milling machine according to the invention comprises a hydraulic steering system, wherein the control elements of the hydraulic steering system within the panel are arranged and can be actuated via the steering wheel.

p0018In order to enable easy mounting of the road milling machine according to the invention as well as easy interchangeability of the steering means, the road-milling machine is designed such that the bracket is releasably secured to the chassis.

p0019In order to enable a particularly simple mounting or dismounting of the steering device, the console is to be plugged in the direction of its longitudinal axis on the chassis and fixed by means of a rotational movement of the panel about its longitudinal axis. Under attaching is understood in this context that the console does not move in the direction of its longitudinal axis and thus can be withdrawn. It can therefore also speak of a so-called bayonet lock.

p0020In the following the invention an exemplary embodiment will be explained referring to the attached figures in detail.

p0021Show it:<dl id="dl0001" compact="compact"><dt>Fig. 1</dt><dd>a schematic representation of an embodiment of the road milling machine according to the invention in the form of a rear loader road milling machine in side view,</dd><dt>Fig. 1A</dt><dd>a partial plan view of the road milling machine <figref idrefs="f0001">Fig. 1</figref>.</dd><dt>FIG. 2</dt><dd>a plan view of the console of <figref idrefs="f0001">Fig. 1</figref>Wherein the steering wheel is not shown,</dd><dt>Fig. 3</dt><dd>a section along the line AA of <figref idrefs="f0002">FIG. 2</figref>.</dd><dt>Fig. 4</dt><dd>a section along the line BB of <figref idrefs="f0002">FIG. 2</figref> and</dd><dt>Fig. 5</dt><dd>a section along the line BB of <figref idrefs="f0002">FIG. 2</figref>Wherein the chassis is not shown, so that only the console can be seen.</dd></dl>

p0022The road milling machine 2 comprises a chassis 4 which is supported in the present embodiment on three wheels 6, 6, 8, wherein the two rear wheels 6, 6 (only one in <figref idrefs="f0001">Fig. 1</figref> seen) laterally in the region of the rear end and the front wheel 8 is arranged centrally in the region of the front side of the road milling machine the second The rear wheels 6, 6 are adjustable in height by means of a hydraulic system, wherein the steering of the road milling machine 2 via the front wheel 8, which can be rotated about a vertical axis a. Alternatively, such a road milling machine 2 in place of the wheels 6, 6, 8 are also supported by chain drives. The number of planned wheels or chain drives may vary.

p0023Within the chassis 4 at least one drive motor for a milling drum and the wheels 6, 6, 8 and a hydraulic system is also provided. Further known from the prior art ancillaries are provided, to their representation omitted for clarity.

p0024The platform 10 is provided above the rear of the road milling machine 2, where, among other things, a seating 12 is for the driver, which is arranged on a base plate 14th The road milling machine 2 can be operated by the driver sitting on both the bottom plate 14 and standing on the seat 12th

p0025Below the driver's cab 10 is a roller housing 16. The cylinder housing 16 a downward, ie in the direction of the road surface 18, open housing in which a milling drum is located 20 wherein the longitudinal axis extends the milling drum 20 transversely to the direction of travel, which in <figref idrefs="f0001">Fig. 1</figref> is illustrated on hand of the arrow b. The milling roller 20 projects out of the cylinder housing 16 downwards towards the road surface 18 produced.

p0026At the b in the same direction rear end of the cylinder housing 16, a vertically adjustable stripping device 22 is provided. In the direction b after the stripping device 22, in turn, a transport device 24 is provided, via which the milled milled material can be supplied to an accompanying truck with a corresponding loading surface (not shown). Since the milled material on the rear of the road milling machine 2 fed to the truck, it is a so-called rear loader road milling machine. The road milling machine can also be a so-called front loading.

p0027In the area of ​​the driver's cab 10, a steering device 26 is further provided which comprises a bracket 28 and a bracket 28 arranged on the steering wheel 30th The console 28 is laterally secured at one end 32 to the chassis 4, while the other end of the bracket 28 is formed as a free end 34th The console 28 extends starting from its fixed end 32 transverse to the direction b to the side, wherein the console extends above the base plate 14 so that an opening 36 between the bottom plate 14 and the bracket 28 are formed.

p0028As from <figref idrefs="f0001">Fig. 1A</figref> be seen, the bracket 28 is secured to an inwardly recessed side wall of the chassis. 4 To the driver (not shown) to enable free on the platform 10 visibility through the opening 36 on the road surface 18, the road milling machine 2 or the chassis 4 of the road milling machine 2 in the embodiment shown, in the direction of travel B is cut out in front of the opening 36th This means that in front of the opening 36 a recess 38 is in the direction b, which extends in the illustrated embodiment, over the entire height of the chassis. 4 When the driver sits, he can 38 look at the road surface 18, for example, through the opening 36 and the recess. When the driver is, but leans forward, he can, for example, look directly through the recess 38th

p0029The steering wheel 30 can be pivoted about the longitudinal axis 40 of the console 28, whereby, advantageously, the console 28 is rotated together with the steering wheel 30 about the axis 40th This makes it possible to optimally adjust the position of the steering wheel according to whether the driver is standing or sitting. An adaptation to the size of the driver is thus possible. In special applications, the pivoting of the steering wheel is also advantageous insofar as by pivoting the steering wheel, the view is released from different angles. For illustration are in<figref idrefs="f0001">Fig. 1</figref> the driver different angles by arrows c, d, e, f in. The arrows show that depending on the position of the steering wheel one way or another viewing direction is released. For the driver, it can certain driving situations be useful to tilt the steering wheel regardless of the ergonomic aspects so that the view is not obstructed on the road from the steering wheel.

p0030The steering wheel 30 can be locked in different pivot positions. Further, the console 28 is releasably secured to the chassis 4, it being the console 28 placed for easy mounting on the chassis 4 and secured by a rotational movement about the longitudinal axis 40 of the console 28th As the above-mentioned features may be implemented by a particular embodiment of panel 28 and chassis 4, Issues The following is with reference to the<figref idrefs="f0002 f0003 f0004">FIGS. 2-5</figref> described.

p0031The console 28 comprises a substantially cylindrical housing 42, the wall of the housing 42 is formed in a region as a flat surface 44, on which the steering wheel 30 is fixed, on whose representation in the <figref idrefs="f0002 f0003 f0004">FIGS. 2-5</figref> is omitted for reasons of clarity. At the free end 34 of the console 28, the housing is open to easy accessibility to the control means (not shown) to ensure the hydraulic steering. Nevertheless, the console should be 28 protected by a cover 46, in reference to the dotted line<figref idrefs="f0003">Fig. 3</figref> is shown.

p0032The wall of the housing 42 has several openings 61 for mounting to the planar surface 44 in <figref idrefs="f0002">FIG. 2</figref> Operating not illustrated and / or display elements 62, 63 which are arranged on the top of the console of the steering wheel (<figref idrefs="f0001">Fig. 1A</figref>). The supply lines for the operating and display elements, not shown in the figures can be circulated together with the hydraulic lines, also not shown along the longitudinal axis 40 through the tubular axle 54 in the chassis side cavity 56th Since the lines are of sufficient length, the lines can twist when swiveling the console, without being damaged.

p0033On the chassis 4 facing the end 32, the console 28 a connecting plate 48, which in particular in <figref idrefs="f0004">Fig. 5</figref> in more detail. The connecting plate 48 has a connecting port 50 which is elongated. In addition, several stopper holes 52 are provided in the connecting plate 50, which are all the same distance from the center 55 of the connecting plate 50th

p0034Chassis side a fixed, tubular axle 54 is provided, which opens into a chassis side cavity 56, hydraulic lines may extend through it. On the axle 54 are a pair of flanges 57, 58 provided, whereby the console facing flange 58 is substantially elongated and formed in a specific pivoting position of the connecting plate 48 can be passed through the communication opening 50th The chassis 4 facing flange 57 is arranged on the flange 58 spaced so that 60 forms therebetween an outwardly facing, annular groove. Further, the flanges 57, 58 sliding or sealing means 66 are provided in the form of sliding or sealing rings on the mutually facing sides.

p003528 to connect the console to the chassis 4, it is pushed in a swiveling position on the axis 54, in which the elongate flange 58 may be passed through the communication opening 50th Subsequently, the bracket is rotated about its longitudinal axis 40, so that the edge of the connection opening 50 in the groove 60 between the two flanges 57, 58 rests. A removal of the console 28 in the direction of the longitudinal axis 40 in this position is no longer possible, so that the bracket 28 is fixed. This is known as a so-called bayonet lock. To lock the console 28 in a specific pivot position, such as a biased pin can be (not shown) is pushed into a locking hole 64 in the fixed flange 57 and the stopper holes 52nd A further rotation of the bracket 28 and the steering wheel attached thereto (not shown) is inhibited thereby.