EP3498916A1 - Road finisher with pivotable material deflector - Google Patents

Abstract

The invention relates to a road paver (1) with a chassis (5) with two traction tracks (83). The road finisher (1) further comprises a chassis (3), a gut bunker (7) mounted on the chassis (3) with respect to a direction of installation (F) on the front of the paver (1) for receiving material and a direction of installation (F) on the rear of the paver (1) provided screed (17) for compacting paving. This is attached by Zugholme (9) on the chassis (3). The paver (1) also comprises a lifting device (29) which is designed to lift the chassis (3) relative to the chassis (5) at least in a rear region of the paver (1). The invention is characterized in that a material deflector (71), which is pivotable relative to the chassis (3), is arranged between the two traction tracks (83).

Description

The present invention relates to road pavers with a liftable at least in a rear region of the paver chassis relative to the chassis.

Known road pavers include with respect to a Einbaufahrtrichtung the front of the paver a Gutbunker for receiving built-in. From the Gutbunker the paving material is conveyed during installation via a suitable longitudinal conveyor in a rear area of the paver. There, the built-in material is distributed by means of a distribution auger transversely to the installation direction and so evenly submitted to a trailed by the paver screed for compacting the paving.

It is for example from the DE 2 140 058 A1 known to provide shielding in the field of auger, which support the distribution of the paving. From the GB 1 355 620 A It is known to provide a hinge in such shielding plates, so that a part of the sheet can yield when collided with objects in a folding movement.

It is known from practice to mount the auger height adjustable on the chassis of the paver. By adjusting the height of the auger with respect to the chassis, the paver can be adapted for the installation of different layer thicknesses. For example, the auger can be raised relative to the chassis to accommodate greater layer thicknesses.

A disadvantage of such a system is that for the installation of very thick layers, the position of the distribution screw relative to the chassis is changed significantly upwards. This may lead to the situation that the distributor screw at least partially blocks a material outlet of the longitudinal conveyor. As a result, the throughput of built-in material for screed is reduced, which is particularly disadvantageous for large layer thicknesses, since an increased amount of paving material is required for this.

From the EP 0 849 398 A1 is a paver known whose rear area is raised to install large layer thicknesses. This is achieved by means of a hydraulic adjusting cylinder height-adjustable vertical guide between a crawler chassis and a chassis of the paver in the rear of the paver. In a front region, the chassis is rotatably mounted on the crawler chassis. A disadvantage of this system are the high loads on the hydraulic actuating cylinder, which is the weight of the chassis essentially completely wear. For a height adjustment correspondingly high forces are needed. In addition, the stability of the paver suffers.

Other road pavers with a liftable at least in a rear chassis are from the US 4,801,218 A and the US 3,901,616 A known. Again, high forces act on hydraulic actuator cylinders, which carry the weight of the chassis substantially completely.

From the brochure "CR600 SERIES PAVERS & MTV" from BOMAG is known under the name "Frame Raise System" another system for lifting the chassis relative to the chassis in a rear area of a paver. In this system, a large circular disc in the installation direction of the paver is arranged vertically aligned with the chassis. The disc is rotatably mounted on the chassis along its circumference. Thus, the disc is rotatable about a running through its center, transverse to the installation direction of rotation main axis of rotation. Eccentrically to the main axis of rotation is provided on an outer surface of the disc a rotatable about a direction transverse to the direction of insertion minor axis connection to the chassis of the paver. The disc can be rotated in its storage on the chassis by means of a hydraulic cylinder. As the disk rotates, due to the eccentricity of the connection between the disk and the chassis, the mutual height relationship between the chassis and the chassis changes in a rear area of the paver. Although in this system the weight of the chassis does not have to be borne entirely by the hydraulic cylinder, it still has to apply high forces to rotate the disk when lifting the chassis. Even when holding the chassis in a certain height position, high loads act on the hydraulic cylinder.

Raising the chassis increases the distance between the chassis and the ground, creating a space where the product can penetrate. This can increase the time it takes to cool down the build-in material under the chassis before it is compacted by the screed. In addition, segregations may occur. Both can lead to a deterioration in the quality of the laid asphalt surface.

It is an object of the invention to improve paver with a liftable in the rear chassis by structurally simple as possible measures such that the quality of the installed asphalt layer is increased.

This object is achieved by a paver with the features of claim 1. Advantageous developments are specified in the dependent claims.

The paver according to the invention comprises a chassis with two tracks of traction and a chassis. It further comprises a respect to a direction of incorporation on the front of the paver mounted on the chassis Gutbunker for receiving items and with respect to the direction Aufaufahrtrichtung behind the paver provided screed for compacting built-in, which is attached by Zugholme to the chassis. In addition, it comprises a lifting device, which is designed to lift the chassis relative to the chassis at least in a rear region of the paver. The paver according to the invention is characterized in that between the two traction tracks a movable, in particular pivotable Materialabweiser is arranged relative to the chassis.

As an alternative to a swiveling design, a displaceable material deflector is also conceivable. Such can be designed as a sliding plate. A movable plate can, for. B. be slidably received in a recess on or in the chassis and pushed out of this to extend the Materialabweiser. It should be clear to the person skilled in the art that pivotable material deflectors on the one hand and extendable material deflectors on the other hand can have different advantages and technical effects. In the following, the terms "unfolded" and "extended / retracted" as well as "extend / retract" and "expand / collapse" are used interchangeably, although the variants are not obvious equivalents.

As traction tracks can be considered areas that extend substantially in the direction of travel and in which traction elements of the chassis of the paver are in engagement with the ground to ensure the propulsion and directional fidelity of the paver. The chassis can be designed as a chain or wheel chassis and carry the chassis. Due to the arrangement of the material deflector between the traction tracks, penetration of built-in material into the space between the traction tracks or between the chassis and the ground can be prevented. Due to the movable design of the material deflector, on the one hand, it can be ensured that its arrangement can be adapted to different lifting heights of the chassis. On the other hand, the Materialabweiser when not in use, for example, when completely lowered chassis, in a folded position continue to be carried on the paver. As a result, disassembly after lowering as well as mounting during or before lifting can become superfluous.

It is advantageous if an actuator unit is provided which is configured to move the material deflector relative to the chassis, in particular to pivot.

It is also conceivable a sensor unit which is configured to detect a distance of the chassis from a ground and / or an appendage between the chassis and the chassis and / or the distance of a lower edge of the Materialabweisers to the ground. This allows monitoring, control or regulation of the lifting process and / or the pivoting process of the material deflector.

It is particularly advantageous if the actuator unit is configured to move the material deflector based on signals generated by the sensor unit, in particular to pivot it. In this way, the (swivel) position of the material deflector can be adapted to one or more of the above-mentioned, detectable by the sensor unit parameters. It is conceivable, for example, that the distance between the lower edge of the material deflector and the substrate is detected continuously and can be kept constant by regulating the (pivoting) position of the material deflector even when the chassis is raised.

It is particularly favorable if a distance between the ground and a lower edge of the material deflector is always the same or greater than the minimum ground clearance of the road finisher.

In various variants, the actuator unit may comprise an electric, hydraulic, electro-hydraulic or pneumatic actuator.

In further variants, the sensor unit may have a laser sensor, a radar sensor or an ultrasonic sensor.

It is advantageous if the lifting device comprises a rocker which is mounted rotatably about a chassis rotation axis on a chassis-side bearing surface and is rotatably mounted about a chassis rotation axis on a chassis side bearing surface. In the chassis-side bearing surface may be a bearing surface that is part of the chassis or at least firmly connected to the chassis. The chassis-side bearing surface can be a bearing surface that is part of the chassis or at least firmly connected to the chassis.

Preferably, the chassis rotation axis and the chassis rotation axis are parallel to each other and in particular each extend in a horizontal plane and perpendicular to the installation direction, ie in a transverse direction of the paver. In particular, the chassis rotation axis and the chassis rotation axis is not identical. Preferably, the chassis rotation axis and the chassis rotation axis are offset parallel to each other.

It is particularly favorable if the lifting device also comprises a variable-length adjusting element which connects a chassis-side linkage point to a rocker-side linkage point and is configured to change a distance between the chassis-side linkage point and the rocker-side linkage point by changing its length and thus face the chassis either raise or lower the suspension. The chassis-side pivot point can be a pivot point that is part of the chassis or at least firmly connected to the chassis. The rocker-side articulation point can be an articulation point, which is part of the rocker or at least firmly connected to the rocker.

In particular, the variable-length adjusting element can each be pivotally connected to the chassis-side pivot point and the rocker-side pivot point. Preferably, a first end of the variable-length adjustment member is pivotally connected to the chassis-side pivot point and a second end of the variable-length adjustment member hingedly connected to the rocker-side pivot point. However, it is also conceivable that the variable-length adjusting element extends on one side or on both sides beyond the respective articulation point.

In another variation, the paver may include a coupling mechanism configured to pivot the material deflector relative to the chassis when the lift raises the chassis relative to the chassis. By such a coupling mechanism, the pivot position of the material deflector can be automatically adjusted to the height of the chassis.

In an advantageous variant of the coupling mechanism may comprise a lever which is rotatably mounted on the chassis.

It is conceivable that the coupling mechanism comprises a control or control unit which is connected to the sensor unit and the actuator unit, wherein the control or control unit actuates the actuator unit in response to signals received from the sensor unit.

It is further conceivable that a chassis protection is provided, which is arranged in the installation direction behind one of the traction tracks. As a result, it can be prevented that built-in material reaches traction elements of the paver and there, for example, their Traction properties can adversely affect. In addition, disadvantages, such as those described above with respect to under the chassis reaching property can be avoided.

It is conceivable that the undercarriage protection is concealed in a position of the chassis which is lowered at the maximum relative to the chassis by the latter to a rear side of the road paver and can be exposed by lifting the chassis. Such a configuration may have the advantage that no additional mechanism is needed to bring the undercarriage protection into a desired position. Rather, the undercarriage protection can be provided at a suitable position and used only when the chassis is raised.

In a further variant, the actuator unit and / or the coupling mechanism may comprise an elastic element. Such an elastic element can avoid damage to the actuator unit or the coupling mechanism, for example when the material deflector encounters or is blocked by objects when moving and / or pivoting or when driving the paver. The elastic element may be biased.

It is particularly advantageous if the elastic element is configured to be deflected when the movement and / or pivoting of the material deflector is blocked. Depending on the design of the elastic element, deflection may be understood to mean a change in length or, in general, a change in the dimensions, a torsion or a reversible deformation.

In the following, the distance between two axes or between an axis and a bearing surface can be defined as the respective minimum distance.

In one variant, a distance between the chassis rotation axis and the chassis rotation axis may be greater than a distance between the chassis rotation axis and the chassis-side bearing surface. This may mean that the chassis rotation axis lies outside the bearing of the rocker on the chassis. As a result, an improved power transmission when lifting or holding the chassis can be achieved. In addition, the lifting device can be made so compact.

Preferably, the variable-length adjustment member is configured to change the position of the rocker with respect to the chassis or the chassis by changing its length. Thus, by the position of the rocker clearly defined operating conditions can be provided, which can be adjustable, for example, as discrete settings, in particular even if the lifting device allows a stepless adjustment of the height of the chassis with respect to the chassis.

Preferably, the ratio of the amount of the portion of the connection vector between the rocker-side linkage point and the trolley rotation axis that is perpendicular to the longitudinal direction of the variable-length adjustment element is equal to the amount of the horizontal direction-extending portion of the linkage between the trolley axis of rotation and the chassis Rotation axis greater than 0.5, than 0.7, as 1, as 1.3, as 1.5 or as 2. Thus, a particularly good power transmission when lifting or holding the chassis is achieved by the variable-length adjustment due to a leverage. The ratio described above may be above one of the specified limits over the entire adjustment range of the chassis height. But it may also be sufficient if this is the case in a maximum lowered or a maximum angeho-benen state of the chassis or in at least one intermediate raising state of the chassis.

The variable-length adjustment member preferably extends at least substantially along a horizontal direction. Thus, the weight of the chassis acting at least substantially along a vertical direction is at least partially absorbed by the rocker or the chassis-side and the chassis-side bearing surface and does not have to be completely supported by the variable-length adjustment element. This contributes to the stability of the entire arrangement. The fact that the variable-length adjustment element extends at least substantially along a horizontal direction may mean that a horizontal component of the extension direction of the variable-length adjustment member is greater than a vertical component of the extension direction of the variable-length adjustment member, and / or an inclination angle between the variable-length adjustment member and a horizontal plane does not exceed 10 °, 15 °, 25 ° or 45 °.

Preferably, the chassis-side pivot point is at least in some operating positions with respect to the installation direction before or behind the chassis axis of rotation and / or the chassis axis of rotation. So a good power transmission can be achieved due to leverage.

A lower stop may be provided on the chassis, which is configured to secure the chassis in a maximally lowered state of the chassis by engagement with the rocker against further lowering. Thus, the variable-length adjustment is relieved in the maximum lowered state of the chassis. In addition, the maximum lowered Condition of the chassis firmly defined by the stop. The lower stop also serves as a backup in case of malfunction of the lifting device.

An upper stop may be provided on the chassis, which is configured to secure the chassis in a maximally raised state of the chassis by engagement with the rocker against further lifting. Such an upper stop serves as a safeguard against over-rotation of the lifting device.

The variable-length adjusting element may be a hydraulic cylinder. A hydraulic cylinder can be well integrated into a usually already provided on a paver hydraulics and allows the transfer of large forces. Alternatively, the variable-length adjusting element could also be a spindle drive. This could achieve a purely mechanical solution.

The paver may further comprise an actuator for varying the length of the variable length adjustment member. Such an actuator can be for example a hydraulic pump for actuating a hydraulic cylinder or a motor for actuating a spindle drive. In addition, a drive element for actuating the actuator for selectively raising or lowering the chassis relative to the chassis may be provided. The driver may allow a vehicle operator to adjust the height of the chassis by means of actuators.

Preferably, a locking element is provided, which is configured to mechanically lock the rocker in a defined relative position with respect to the chassis. Thus, the chassis can be mechanically held at a defined height and thus the variable-length adjustment can be relieved. The locking element can be designed to lock the rocker exclusively in a predetermined relative position with respect to the chassis, in particular in a position corresponding to a transport height of the chassis.

The locking element may be a locking bolt provided on the chassis, which is extendable for locking engagement with a locking structure, for example an opening or a depression, of the rocker. In particular, the locking element can be horizontally, in particular perpendicular to the installation direction, extendable.

The chassis may be pivotally mounted to the landing gear at the front of the paver, so that when the chassis is lifted asymmetrically along the direction of installation, there is no tension between the chassis and the chassis.

To avoid stresses, the chassis may be longitudinally slidably mounted on the landing gear in a forward portion of the paver with respect to the direction of installation travel.

Preferably, the paver comprises a distribution auger for distributing built-in material in front of the screed transverse to the installation direction. The paver may further comprise a conveyor for conveying putty from the hopper to the auger. The auger may be fixedly attached to the chassis in a fixed relative position to the chassis. Since the chassis is liftable relative to the chassis, it is possible to dispense with a height adjustability of the auger with respect to the chassis and thus achieve greater stability. When lifting the chassis with the auger mounted thereon as a whole, the mutual spatial relationship between auger and a material outlet of the conveyor is not changed. There is no blocking of the material outlet when lifting the chassis to achieve large installation thicknesses.

Figur 1

eine schematische Seitenansicht eines Straßenfertigers gemäß einer Ausführungsform;

Figur 2

eine schematische Perspektivansicht des Chassis und des Fahrwerks des Straßenfertigers gemäß der Ausführungsform;

Figur 3

eine schematische Perspektivansicht auf die Wippe einer Anhebeeinrichtung des Straßenfertigers gemäß der Ausführungsform;

Figur 4A

eine schematische Seitenansicht auf das Fahrwerk und das Chassis des Straßenfertigers gemäß der Ausführungsform in einer maximal abgesenkten Position des Chassis;

Figur 4B

eine schematische Seitenansicht auf das Fahrwerk und das Chassis des Straßenfertigers gemäß der Ausführungsform in einer maximal angehobenen Position des Chassis; und

Figur 5

eine schematische Perspektivansicht auf einen in Fahrtrichtung vorne an dem Straßenfertiger gemäß der Ausführungsform gelegenen rechten Verbindungsbereich zwischen Fahrwerk und Chassis.

Figur 6A

eine schematische Perspektivansicht auf ein Chassis gemäß einem Ausführungsbeispiel mit einem ausgeklappten Materialabweiser und einem Koppelmechanismus.

Figur 6B

die Ansicht aus Figur 6A mit eingeklapptem Materialabweiser.

Figur 7A

eine schematische Rückansicht eines Chassis mit zwei Fahrwerken gemäß dem Ausführungsbeispiel aus den Figuren 6A und 6B in einer angehobenen Position des Chassis.

Figur 7B

die Ansicht aus Figur 7A in einer abgesenkten Position des Chassis.

Figur 8

eine schematische Darstellung eines eine Regel- oder Steuereinheit aufweisenden Koppelmechanismus gemäß einem Weiteren Ausführungsbeispiel.

Figur 9A

eine schematische Seitenansicht eines abgesenkten Chassis mit Fahrwerk gemäß einem Ausführungsbeispiel mit Fahrwerkschutz.

Figur 9B

die Ansicht aus Figur 9A mit gegenüber dem Fahrwerk angehobenem Chassis.

In the following, the invention will be explained in more detail by means of embodiments with reference to the figures. Show

FIG. 1

a schematic side view of a paver according to an embodiment;

FIG. 2

a schematic perspective view of the chassis and the chassis of the road paver according to the embodiment;

FIG. 3

a schematic perspective view of the rocker of a lifting device of the paver according to the embodiment;

FIG. 4A

a schematic side view of the chassis and the chassis of the paver according to the embodiment in a maximum lowered position of the chassis;

FIG. 4B

a schematic side view of the chassis and the chassis of the paver according to the embodiment in a maximum raised position of the chassis; and

FIG. 5

a schematic perspective view of a front in the direction of travel on the paver according to the embodiment located right connection region between the chassis and chassis.

FIG. 6A

a schematic perspective view of a chassis according to an embodiment with an unfolded Materialabweiser and a coupling mechanism.

FIG. 6B

the view FIG. 6A with folded material deflector.

FIG. 7A

a schematic rear view of a chassis with two suspensions according to the embodiment of the FIGS. 6A and 6B in a raised position of the chassis.

FIG. 7B

the view FIG. 7A in a lowered position of the chassis.

FIG. 8

a schematic representation of a control or control unit having a coupling mechanism according to another embodiment.

Figure 9A

a schematic side view of a lowered chassis with chassis according to an embodiment with chassis protection.

FIG. 9B

the view Figure 9A with the chassis raised above the chassis.

Fig. 1 shows a schematic side view of a road paver 1 according to the invention according to one embodiment. The road paver 1 comprises a chassis 3 and a chassis 5, in the present case a tracked chassis. In installation direction F front a Gutbunker 7 is mounted on the chassis 3 for receiving built-in. With respect to the Einbaufahrtrichtrung F two lateral sides of the paver 1 each a pull arm 9 is held on the chassis 3 via a height-adjustable articulation point 11. The articulation point 11 is height adjustable by means of a articulated hydraulic cylinder 13 on the paver 1. At a rear side of the road paver 1, the traction arms 9 are again attached on both sides by means of height-adjustable rear hydraulic cylinders 15 on the chassis 3. At the rear end of the traction arms 9 with respect to the direction of installation F, a screed 17 is suspended for compacting paving material. During installation, the screed 17 is dragged by the pulling arms 9 on the body in a floating behind the paver 1. In the chassis 3, a conveyor 19 is provided for conveying built-in material from the Gutbunker 7 in a rear region of the paver 1. In the back of the paver 1 leaves the built-in the conveyor 19 through a material outlet 21 and arrives at a fixed to the chassis 3 distribution auger 23 for distributing built-in material in front of the screed 17 transverse to the installation direction F. The auger 23 and the material outlet 21 are in Fig. 1 covered, but in Fig. 2 shown. On the chassis 3 of the road paver 1, a control station 25 is provided, which provides space for an operator and control units 27 for making inputs for controlling the paver 1 includes.

Fig. 2 shows a schematic side view of the chassis 5 and the chassis 3 of the paver 1, wherein for reasons of clarity, various on the chassis 3 provided structures, components and panels are not shown. In a respect to the installation direction F rear portion of the chassis 3, a lifting device 29 is provided for lifting the chassis 3 relative to the chassis 5 in the rear of the paver 1. The lifting device 29 comprises on both lateral sides of the paver 1 each a rocker 31 and a variable-length adjustment member 33. In the following, the structure and operation of the lifting device 29 are described only for one side of the paver 1. The opposite side can be designed analogously.

The rocker 31 is rotatably mounted about a suspension axis of rotation A on a chassis-side bearing surface 35. As in Fig. 2 For this purpose, a crawler support 37 of the chassis 5 comprises a cylindrical recess 39, the inner wall of which forms the chassis-side bearing surface 35. In the recess 39 extending along the chassis axis of rotation A extending cylindrical extension 41 of the rocker 31 is rotatably received. Alternatively, it would also be conceivable that a corresponding recess in the rocker 31 is provided and a cylindrical extension of the track carrier 37 is rotatably received about the suspension axis of rotation A therein. In this case, the chassis-side bearing surface 35 would be formed by the peripheral surface of the extension.

The rocker 31 is also rotatably mounted about a chassis axis of rotation B on a chassis side bearing surface 43. As based on the in Fig. 3 illustrated schematic view of the in Fig. 2 visible inner surface of the rocker 31, this is a fixedly attached to the chassis 3 cylindrical member 45 rotatably received in a corresponding recess 47 of the rocker 31 about the chassis axis of rotation B. The chassis-side bearing surface 43 is provided by an outer periphery of the cylindrical member 45. Alternatively, it would also be conceivable that an extension of the rocker 31 is rotatably received in a corresponding recess of a chassis-fixed element about the chassis axis of rotation B. In this case an inner circumferential surface of the recess would provide the chassis side bearing surface 43.

The chassis rotation axis A and the chassis rotation axis B are parallel to one another and extend in a direction perpendicular to the installation direction F transverse direction.

As in Fig. 2 is shown, a first end of the variable-length adjustment member 33 is rotatably connected about a rotational axis E with a chassis-side pivot point 49. A second end of the variable-length adjustment member 33 is rotatably connected about a rotation axis G with a rocker-side pivot point 51. Thus, the variable-length adjustment member 33 connects the chassis-side pivot point 49 with the rocker-side pivot point 51. The rotation axis E and the rotation axis G are parallel to each other and to the chassis rotation axis A and the chassis axis of rotation B and extend in a direction perpendicular to the installation direction F transverse direction ,

In the embodiment shown, the variable-length adjusting element 33 is a hydraulic cylinder. But it would also be the provision of another variable-length adjustment member 33 conceivable, such as a spindle drive. The variable-length adjustment member 33 is actuated by means of an actuator 53 for changing its length. The actuator 53 can be controlled by means of a drive element 55, which is an operating element in the operating state 25 of the paver 1 in the embodiment shown, for changing the length of the variable-length adjustment member 33. This may in particular be based on user inputs of a paver driver.

By changing the length of the variable-length adjustment member 33 by means of the actuator 53, a distance between the chassis-side pivot point 49 and the rocker-side pivot point 51 is changed. As a result, the position of the rocker 31 is changed with respect to the chassis 5 and the chassis 3 and so the chassis 3 relative to the chassis 5 either raised or lowered.

The variable-length adjustment member 33 extends at least substantially along a horizontal direction. In the embodiment shown, the chassis-side pivot point 49 with respect to the installation direction F behind the chassis axis of rotation B and the chassis axis of rotation A. It would also be conceivable that the chassis-side pivot point 49 with respect to the mounting direction F in front of the chassis axis of rotation B and / or the chassis axis of rotation A is located.

In Fig. 4A the chassis 3 is shown in a relation to the chassis 5 maximum lowered position. In the embodiment shown this corresponds to a minimum length of the variable-length adjustment member 33. In the maximum lowered position of the chassis 3, the chassis 3 is secured against further lowering by engagement of the rocker 31 with a provided on the chassis 3 lower stop 57. Will from the in Fig. 4A shown increases the length of the variable-length adjustment member 33 by means of the actuator 53, the distance between the chassis-side pivot point 49 and the rocker-side pivot point 51 increases Fig. 4A shown rotated clockwise about the suspension axis of rotation A, which in the plane of the drawing passes centrally through the extension 41 of the rocker 31. As a result, due to the rotatable about the chassis axis of rotation B storage of the rocker 31 on the chassis side bearing surface 43, the chassis 3 is raised.

With continued extension of the length of the variable-length adjustment member 33 is finally in Fig. 4B shown state reached. Fig. 4B shows a maximum raised state of the chassis 3 relative to the chassis 5. In this state, the rocker 31 engages with an upper stop 59 provided on the chassis 3, which further extends the length of the variable-length adjusting element 33 and thus further pivoting of the rocker 31st prevents the suspension axis A rotation.

By further reducing the length of the variable-length adjustment member 33, the chassis 3 of the in Fig. 4B be lowered out again shown position. Preferably, the chassis 3 is continuously adjustable in height between the minimally raised state and the maximum raised state by suitably adjusting the variable-length adjustment member 33. But it would also be the provision of several discrete settings conceivable.

As in Fig. 3 shown, in the embodiment shown, a locking element 61 designed as a locking bolt for mechanically locking the rocker 31 in a defined relative position with respect to the chassis 3 is provided. The locking element 61 is provided on the chassis 3 and laterally extendable in a horizontal plane perpendicular to the installation direction F, in order to engage in a deployed position with a locking structure 63 of the rocker 31. In the embodiment shown, the locking structure 63 of the rocker 31 is formed as a recess. By a locking engagement of the locking element 61 with the locking structure 63 of the rocker 31, the rocker 31 is set against changing its relative position with respect to the chassis 3 and the chassis 5. So can the chassis 3 in a defined height adjustment, for example, in a transport position for transporting the paver 1 between construction sites, are mechanically secured.

As in others in the FIGS. 4A and 4B can be seen, a distance d between the chassis axis of rotation B and the chassis axis of rotation A is greater than a distance e between the chassis axis of rotation B and the chassis side bearing surface 43. The chassis axis of rotation A is therefore outside the storage of the rocker 31 on the Chassis 3. As a result, an improved power transmission when lifting the chassis 3 is achieved. In addition, the lifting device 29 can be seen to be made compact.

In the FIGS. 4A and 4B is the amount f of perpendicular to the longitudinal direction of the variable-length adjustment member 33 portion of the connection vector between the rocker-side pivot point 51 and the chassis rotation axis A shown schematically constructed. In addition, the amount x of the proportion of the connection vector between the chassis rotation axis A and the chassis rotation axis B which extends in a horizontal direction is illustrated schematically. Preferably, the ratio of these amounts, as f / x is greater than 0.5, as 0.7, as 1, as 1.3, as 1.5 or as 2. Thus, due to a leverage a particularly good power transmission in Raising or holding the chassis 3 achieved by the variable-length adjustment member 33.

In the embodiment shown, the chassis 3 is pivotally mounted on the chassis 5 in a front area of the road finisher 1 with respect to the installation direction F, and longitudinally displaceable with respect to the installation direction F. Thus, the chassis 3 can be raised or lowered in the rear area of the road paver 1 relative to the chassis 5, without generating stresses in the front region of the road paver 1. An asymmetrical lifting of the chassis 3 is possible such that the chassis 3 is raised further in the rear area of the road finisher 1 than in the front area of the road finisher 1. Fig. 5 shows a schematic side view of a detail located on the right side of the paver 1 attachment region 65 between the chassis 5 and the chassis 3. On the left side of the paver 1 could be an analogously formed mounting portion 65 is present. The chassis 5 is pivotally mounted and with respect to the installation direction F longitudinally displaceable on a bearing block 67 of the chassis 3. In particular, the chassis 5 may be mounted on the bearing block 67 by means of a spherical plain bearing 69 with integrated sliding bearing.

The view in FIG. 6A shows a chassis 3 of a paver 1 according to an embodiment with a Materialabweiser 71. This can be moved, for example as shown Embodiment pivoted to be provided on the chassis 3. The material deflector 71 has a lower edge 73. For moving, ie in the present embodiment for pivoting, the material deflector 71, a coupling mechanism 75 is provided. As in the present exemplary embodiment, this may be a mechanical coupling mechanism, in particular a purely mechanical coupling mechanism. In the present embodiment, the coupling mechanism comprises a deflection lever 77 which is rotatably mounted on the chassis 3. This can be connected to a rod 79, which in turn can be connected to the lifting device 29, in the present embodiment, with the rocker 31. The rod 79 may be configured to transmit a movement of the lifting device 29, in particular a rotation of the rocker 31 on the lever 77. In this case, the reversing lever 77 can be set in rotation.

The rod 79 may have a thread through which the length of the rod 79 is adjustable. This may allow adjustment of the coupling mechanism 75, e.g. B. to compensate for game and / or tolerances. A targeted adjustment of the pivoting range of the material deflector 71 can be made possible by such a thread.

The reversing lever 77 may further be connected to an elastic member 81. The elastic element 81 in turn may be connected to the material deflector 71 in such a way that a movement or deflection, for example an expansion or compression, of the elastic element 81 causes a movement, in particular a pivoting, of the material deflector 71. The components mentioned can cooperate in such a way that a movement of the lifting device 29 displaces the rod 79, as a result of which the deflection lever 77 can be rotated. The rotation of the reversing lever 77 can in turn move the elastic element 81, whereby the Materialabweiser 71 moves, in particular can be pivoted.

The elastic member 81 may be provided on a strut 82. This can serve to prevent kinking of the elastic element 81. The strut 82 may be telescopically configured to allow deflection of the resilient member 81. Similar to the rod 79, the strut 82 may have a thread through which the length of the strut 82 is adjustable. This can provide a further adjustment possibility of the coupling mechanism 75, for. B. to compensate for game and / or tolerances. A targeted adjustment of the pivoting range of the material deflector 71 can be made possible by such a thread. The coupling mechanism 75 may also include a strut 82 without providing an elastic member 81 thereon. Then any designs are conceivable, the are not telescopic. However, a thread can also be advantageous in variants without elastic element 81.

The FIG. 6A shows the lifting device 29 in a position in which the chassis 3 is raised relative to the chassis 5. Due to the position of the rocker 31, the material deflector 71 was moved by cooperation of the rod 79, the reversing lever 77 and the elastic member 81 in a deployed position. FIG. 6B shows the lifting device 29 in a position in which the chassis 3 with respect to the chassis 5 is arranged in a fully lowered position. In this case, as also in the FIG. 6B to recognize the Materialabweiser 71 arranged in a folded position.

In the in FIG. 7A shown schematic view, the chassis 3 and the chassis 5 can be seen from behind. By the trolleys 5 Traction tracks 83 are defined. Between the traction tracks 83 of the material deflector 71 is arranged. In FIG. 7A the chassis is raised relative to the trolleys 5 and the material deflector 71 is unfolded. The lower edge 73 is arranged at a distance g from a substrate 85. The distance h is defined between the chassis 3 and the ground 85.

In FIG. 7B is the chassis 3 with respect to the chassis 5 to a lifting i compared to in FIG. 7A lowered position shown. The distance g between the lower edge 73 and the ground 85 is opposite FIG. 7A stayed the same.

FIG. 8 is a schematic representation of the coupling mechanism 75 according to another embodiment. In this embodiment, the coupling mechanism 75 comprises a control unit 87. Alternatively, however, a control unit may be provided. Furthermore, the coupling mechanism 75 according to this embodiment may include a sensor unit 89. This may be configured to measure or determine the distance g between the lower edge 73 and the ground 85 and / or the lift i and / or the distance h between the chassis 3 and the ground 85. The sensor unit 89 may be connected to the control unit 87 in order to transmit measured or detected values to the control unit 87.

The coupling mechanism 75 according to the in FIG. 8 illustrated embodiment may further comprise an actuator unit 91. This may be connected to the control unit 87 to receive control signals. In cases where a control unit is provided, the actuator unit 91 may also be connected thereto to receive control signals. The actuator unit 91 may include an actuator 93. This can be configured to to move the material deflector 71, in particular to pivot. Actuator 93 may be any suitable actuator known to those skilled in the art. In particular, electrical, hydraulic, electro-hydraulic or pneumatic actuators are conceivable, for example an electric or servomotor, or a hydraulic cylinder. Accordingly, it may be at the control unit 87 z. B. to act an electrical, hydraulic, electro-hydraulic or pneumatic control unit.

For regulating or controlling the movement of the material deflector 71, various possibilities are conceivable. For example, it is conceivable that the sensor unit 89 detects the distance g between the lower edge 73 of the material deflector 71 and the substrate 85 and transmits this to the control unit 87. The control unit 87 may then be configured to transmit control signals to the actuator unit 91 based on the received distance, causing the actuator unit 91 to drive the actuator 93 such that the distance g between the lower edge 73 and the ground 85 remains constant ,

Alternatively, the sensor unit 89 can detect the approach i and transmit it to the control unit 87. Based on the lifting height i, the latter can determine a desired position of the material deflector 71, which is assigned to the detected lifting height i. An assignment of a lifting height i to a position of the material deflector 71 can be made by mathematical formulas or tables. It is conceivable that the control unit 87 transmits the desired position to the actuator unit 91 and independently controls or regulates the actuator 93 such that the material deflector 71 assumes the received desired position. However, it is also conceivable that the control unit 87 itself comprises a controller, and transmits only control signals to the actuator 91.

In Figure 9A is a side view of a chassis 5 of a road paver 1 shown according to another embodiment. In this embodiment, a chassis protection 95 is provided. This can for example, as shown in the embodiment, be attached to the crawler support 37. In the in Figure 9A illustrated configuration, the chassis 3 is completely lowered relative to the chassis 5. In this configuration, the undercarriage 95 is hidden behind the chassis 3 as seen in the direction of travel. In this configuration, the chassis 3 prevents the built-in material from entering the area of the chassis 5.

In FIG. 9B the chassis 3 is raised relative to the chassis 5. As a result, as in the present exemplary embodiment, the chassis protection 95 can be exposed. In this configuration, the undercarriage 95 can prevent the vehicle from entering the area of the chassis 5. It can also be seen that without the undercarriage 95 between the lower Edge of the chassis 3 and the substrate would be significantly more space that would allow the built-in to get into the area of the chassis.

Claims (15)

Road paver (1) with
a chassis (5) with two tracks (83);
a chassis (3);
a gut bunker (7) attached to the chassis (3) with respect to a direction of installation (F) at the front of the paver (1) for the purpose of receiving objects;
a screed (17) provided with respect to the direction of installation (F) at the rear of the paver (1) for compacting paving material which is attached to the chassis (3) by means of drawbars (9); and
a lifting device (29) which is designed to lift the chassis (3) relative to the chassis (5) at least in a rear region of the paver (1),
characterized,
in that a material deflector (71) which is movable relative to the chassis (3) and is in particular pivotable is arranged between the two traction tracks (83). Road paver according to claim 1, characterized by an actuator unit (91) which is configured to move, in particular to pivot, the material deflector (71) relative to the chassis (3). Road paver according to one of the preceding claims, characterized by a sensor unit (89) which is configured, a distance of the chassis (3) from a substrate (85) and / or an attachment (i) between the chassis (3) and the chassis (5) and / or to detect the distance (g) of a lower edge (73) of the material deflector (71) to the substrate (85). Road paver according to claims 2 and 3, characterized in that the actuator unit (91) is configured to move, in particular to pivot, the material deflector (71) based on signals generated by the sensor unit (89). Road paver according to claim 2 or 4, characterized in that the actuator unit (91) comprises an electric, hydraulic, electro-hydraulic or pneumatic actuator (93). Road paver according to claim 3 or 4, characterized in that the sensor unit (89) comprises a laser sensor, a radar sensor or an ultrasonic sensor. Paver according to one of the preceding claims, characterized in that the lifting device (29) comprises a rocker (31) which is mounted on a chassis rotation axis (A) rotatably mounted on a chassis-side bearing surface (35), and about a chassis axis of rotation ( B) is rotatably mounted on a chassis-side bearing surface (43). Road paver according to claim 7, characterized in that the lifting device (29) further comprises a variable-length adjustment member (33) which connects a chassis-side pivot point (49) with a rocker-side pivot point (51), and is configured by a distance by changing its length to change between the chassis-side pivot point (49) and the rocker-side pivot point (51) and thus selectively raise or lower the chassis (3) relative to the chassis (5). Road paver according to one of the preceding claims, characterized by a coupling mechanism (75) which is configured to pivot the material deflector (71) relative to the chassis (3) when the lifting device (29) engages the chassis (3) relative to the chassis (3). 5) lifts. Road paver according to claim 9, characterized in that the coupling mechanism (75) comprises a reversing lever (77) which is rotatably mounted on the chassis (3). Road paver according to claim 2, 3 and 9, characterized in that the coupling mechanism (75) comprises a control or control unit (87) which is connected to the sensor unit (89) and the actuator unit (91), wherein the control unit (87) actuates the actuator unit (91) in response to signals received from the sensor unit (89). Paver according to one of the preceding claims, characterized by a chassis protection (95), which is arranged in the installation direction (F) behind one of the traction tracks (83). Road paver according to claim 12, characterized in that the undercarriage guard (95) is concealed in a position of the chassis (3) which is lowered at the maximum relative to the chassis (5) by the latter to a rear side of the paver (1) and by raising the chassis (3 ) is exposable. Road paver according to one of the preceding claims, characterized in that the actuator unit (91) and / or the coupling mechanism (75) have an elastic element (81). Road paver according to claim 14, characterized in that the elastic element (81) is configured to be deflected when the movement and / or pivoting of the material deflector (71) is blocked.

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