Road construction machines for milling roadways

The invention relates to a road construction machine for processing Of roadways, eg of concrete, Asphalt or the like. According to the preamble of claim 1.

Such street construction machines are used, for example, as Cold milling for roadway decking.

DE-A-23 44 877 discloses a device for milling Of road covers, in which pivoted support wheels Are fixed to a height-adjustable milling drum. The The support wheel is pivoted about a vertical axis. The support wheel is likewise height-adjustable.

The pivoting position of the support wheel can be adjusted by means of bolts Can be arrested. These support wheels are used to measure the milling depth Of the milling drum. you are not And do not carry the gear supported by the landing gear Machine weight.

In the case of new-type milling (FR-A-2642773) is an all-wheel drive So that also the normally in height of the milling drum axis Are also driven. The support wheels are telescopic by means of hydraulic cylinders And carry the machine weight. The milling drum Is arranged at the rear end of the machine frame and Reaches with its one end face up close to the so - called Zero side, in which the end face of the milling drum Almost flush with the side edge of the machine frame . The milling drum is thus approximately flush and Parallel to the rear of the machine frame. Because of the direct adjustability of the milling depth The support wheels are located at the level of the roller axis of the milling drum. For edge-to-edge milling on the zero side The supporting wheel arranged on the zero side, which in the Normal first end position laterally across the zero side , Pivots inward relative to the machine frame So that it can be worked close to the edges. The pivoting of the support wheel is performed by a vertical movement The supporting wheel being located at two points of the machine frame With a large vertical spacing, To provide sufficient stability to support the machine weight to achieve. The single-axle bearing of the pivoting device Is opposite the zero side, so that although A close-to-work is possible, but not one Flush approach to a house wall.

The driving position is on the machine frame above the Milling drum. For edge - to - edge milling on the Zero side and hinders the support wheel and the single axis Vertical support wheel bearing a clear view of the Work area in front of the milling drum, both in the swung out As well as in particular in the swiveled-in state. Due to the fact that the pivoting device has a lot of space Is required to place a cabin on the driving position not possible. Furthermore, the ascent and descent of the From the rear Safety is disadvantageous. A further disadvantage exists In that, by the pivoting of the support wheel, Direction. As a result, a rotation direction switching Of the hydraulic drive for the support wheel Or the support wheel must be rotatable in the Lifting column, then an additional locking device necessary is.

The object of the invention is to provide a road construction machine Of the type mentioned at the outset, In such a way that when the machine is pivoted on the zero side of the machine Support the free view of the working area in front of the Work equipment for edge-tight work becomes.

The features of the claim serve to achieve this object 1.

The invention provides advantageously that the Pivotable support wheel over one in a horizontal plane Which is coupled to a drive device From the first outer end position into the inner end position End position. Through the horizontal position Of the gearbox is the vertical space requirement for the Pivoting device of the supporting wheel is considerably reduced, so That the supporting wheel with the pivoting device has a better View of the working area in front of the work equipment Both in the swung out and also in the swiveled State.

The pivotable support wheel is maintained while maintaining the direction of travel The supporting wheel being movable into the inner Parallel-displaced end position. The Maintaining the running direction has the advantage that the Drive for the support wheel not in its direction of rotation Must be switchable. For example, in the cross-section Rectangular or square lifting columns Which are more favorable with regard to directional stability are. This is not necessary for lifting columns with a round cross section Twisting of the support wheel by 180 °.

The transmission can advantageously be arranged in a lower position Which are located at the driving position, so that An unobstructed observation of the working area before the Work device by the vehicle driver. The arrangement of the transmission also enables a cabin To the driving stand, whereby a direct access To the driver's position from the side.

The transmission preferably consists of a steering drive. Such a transmission can be operated in spite of the low vertical Extent to absorb high vertical forces, as it can affect Each have two horizontally spaced vertical bearings Can be supported.

The steering drive is coupled to a drive device, So that the pivoting of the support wheel of FIG The vehicle operator on the driving position on a control panel Can be caused.

The steering gear can be made of a four - shaft gearbox with Four vertical articular axes and two in a horizontal Level swiveling handlebars. At a The supporting load is distributed at the Frame and on the support wheel in each case on two vertical supports Articulated axles so that the weight of the machine is increased Stability also with shortened vertical extent of the Pivoting means.

The machine-side joints are located in the machine frame And are not opposite the zero side. On This way it is possible to work not only close to the edge, But also flush to a house wall. Opposite to a single-axis version of the pivoting device A smaller lateral stroke results Between the two end positions of the support wheel, so that There is less space for the outer end position of the support wheel Which does not unnecessarily widen the machine becomes.

The working device can consist of a milling roller, One end face of which is approximately flush with the zero side . The milling drum axis extends orthogonally To the direction of travel of the road construction machine.

Preferably, the working means is at the rear end Of the machine frame and closes approximately flush With this. In this way, it is possible to use the Work equipment not only close to the edge, But into corners.

The rear support wheels are for adjusting the working depth Of the working device.

In this case, the rear support wheels and / or the at least one rear support wheel can be provided A support wheel of the front landing gear axle is driven be.

The pivotable support wheel can be pivoted in its respective End positions with the aid of a locking device will. A simple mechanical locking device Consists, for example, of bolts which are formed by parts of the Transmission and the machine frame.

On the pivotable supporting wheel the joints or the Articulated axles of the steering drive on at least one rotationally fixed Attached to the lifting column. The joints on the support plate on the Machine frame. The support plate Ensures a stable guidance of the support wheel.

The driving device for the steering gear Can be made from a push rod with linear drive and two Handlebars. By actuating the linear drive The pivoting movement of the supporting wheel can then be carried out will.

In another embodiment, it can be provided, That the rear support wheels are steerable.

Referring now to the drawings, FIG EXEMPLARY EMBODIMENT OF THE INVENTION

Show it:<dl tsize="9" compact="compact"><dt>FIG</dt><dd>A schematic side view of the road construction machine,</dd><dt>FIG</dt><dd>12 a top view of the road construction machine according to FIG Figures 1,</dd><dt>Fig. 3a</dt><dd>A support wheel in an outer end position,</dd><dt>3b</dt><dd>The support wheel in an intermediate position, and</dd><dt>3c</dt><dd>The support wheel in the inner end position.</dd></dl>

FIG. 1 shows a road construction machine for milling off Roadways with a self-propelled chassis From a steerable front chassis axle 6 with two with A hydromotor driven support wheels 12 and two Independent rear support wheels 14, 16. The Chassis carries a machine frame 8, on which a Driver's position 4 on the so-called zero side 24 of the road construction machine At the level of the axles of the support wheels 14, 16 As shown in FIG. The rear support wheels 14, 16 are With the aid of a lifting column 48, in order to adjust the height Working depth of a working device consisting of a milling drum 20 can be set.

The milling drum 20 is nearly at its one end Flush with the zero side 24 of the machine frame, so that On the zero side of the road construction machine Work is possible. For this purpose, the support wheel 16 turns off An outer end position 26 beyond the zero side plane Inwards into a recess 18 of the machine frame , So that the outer edge of the supporting wheel 16 Flush with the zero side 24.

The support wheels 14, 16 are driven by a hydromotor. The milling drum axis runs as shown in FIG. 1, in the same vertical plane as the Axes of the support wheel 14 and the support wheel 16 in the Outer end position.

The engagement circle of the milling roller ends in the vicinity of the Rear end of the machine frame 8 so as to extend into corners Can be milled close to the edge.

The pivoting device for the support wheel 16 consists of A steering drive 30 with four vertical articulated axles , With two joints in one Horizontal plane pivotable handlebars 44,46. Two Joints 40, 41 are stationary on the machine frame 8 and Two joints 42, 43 are attached to the pivotable support wheel 16 Each in two vertically spaced support plates 38, Provided.

Joints 56,58,60,62 are coaxial with the vertical Articular axes.

The link rod 46 is provided with its one end around the axis defined in the Which are supported on the machine frame 8 And at its other end with the vertical between two Spaced support plates 38, 39 Articulated.

The link 44 is machined around the link pin 58 Which is mounted in the machine frame 8, and FIG On the side of the support wheel 16 with the link pins 60 Which is arranged between the support plates 38, 39 Is stored.

The connecting rods 44, 46 thus move between the vertical Spaced support plates 38,

FIGS. 3a to 3c show the pivoting process in which the Support wheel 16 from its outer end position 26 into the inner End position 28 by means of a drive device 34 is moved.

The drive device 34 consists of a hydraulic drive Piston cylinder unit 33 with a push rod 35 and two Handlebar arms 36,37. The link arm 37 is two-armed Lever, the one end being attached to the machine frame 8 and the other end is connected to the second Arm arm 36 is hinged. The other end of the Second link arm 36 is connected to the link 44 of the pivoting device connected.

The push rod 35 can be actuated by the vehicle operator on the Driving station 4. In the retracted position Of the push rod 35, the support wheel 16 is located in its Outer end position which exceeds the zero side 24 26. In the extended state of the push rod 35, Steering gear 30, so that the supporting wheel 16 can be rotated in the direction indicated by the arrow The inner end position 28 can be moved. Before the The supporting wheel 16 is pivoted using the lifting column 48, so that the support wheel 16 is without ground contact Can be pivoted.

In the respective end positions 26, 28 of the support wheel, The steering gear 30 by means of one in the drawings Not shown, which is formed by corresponding locking holes Is fixed. For Is the outer end position 26 of the support wheel according to FIG A locking hole 50 is provided in the machine frame 8, Which is provided with a through-opening 52 in the guide 44 in FIG Of the end position 26. The bolt can then pass through Both openings 50, 52 are inserted and thus the Lock the steering gear 30.

In the inner end position 28 the locking of the Steering gear 30 with the aid of locking holes 54 in FIG The support plates 38, 39. The bolt is passed through the Upper support plate 38, through the through-opening 52 in the Handlebars 44 and through the lower support plate 39. In the end position 28, neither the support wheel 16 is located Nor any transmission element of the steering drive The zero side 24.

As can be seen from FIGS. 3a to 3c retains the support wheel 16 its direction of rotation and is relative to the external End position in forward direction and inwards direction In parallel.