EP4450707A1 - Screed assembly with functional coupling between a height adjustment device and a tilting device - Google Patents

Abstract

A screed assembly (7) for a road paver (1) comprises a main screed (15) and a secondary screed (17). The main screed (15) comprises a main screed screed plate (23) for contact with paving material. The secondary screed (17) comprises a screed plate carrier (27) and a secondary screed screed plate (21) for contact with the paving material. The secondary screed screed plate (21) is attached to the screed plate carrier (27) so as to be tiltable about a tilting axis (41). The screed assembly (7) comprises a height adjustment device (31) which is configured to lower or raise the screed plate carrier (27) relative to the main screed (15). The screed arrangement (7) comprises a tilting device (45) which is configured to change a tilting angle of the secondary screed screed plate (21) about the tilting axis (41). The height adjustment device (31) and the tilting device (45) are functionally coupled in such a way that when the screed plate support (27) is lowered or raised relative to the main screed (15) by the height adjustment device (31), the tilting device (45) is automatically actuated to change the tilting angle of the secondary screed screed plate (21) about the tilting axis (41). Alternatively or additionally, the height adjustment device (31) and the tilting device (45) are functionally coupled such that when the tilting angle of the secondary screed screed plate (21) is changed about the tilting axis (41) by the tilting device (45), the height adjustment device (31) is automatically actuated to lower or raise the screed plate carrier (27) relative to the main screed (15).

Description

The invention relates to a screed arrangement for a road paver.

From the EP 2 199 467 A1 A paving screed for a road finisher is known, which comprises a base screed and extending screeds. The extending screeds can be moved in a direction relative to the base screed to change the working width. The extending screeds are each supported by an extending guide structure on a guide fixed to the base screed. Smoothing plates are arranged at the bottom of the base screed and the extending screeds. The extending screed comprises a frame having the extending screed smoothing plate. Between the extending guide structure and the frame of the extending screed, vertical adjustment devices that can be actuated via a drive are provided for adjusting a height of the frame relative to the extending guide structure.

Other screeds with a base screed and extendable screeds that can be moved relative to the base screed are, for example, from the EP 1 031 660 A1 , the EP 2 199 466 A1 and the EP 2 218 824 A1 known.

According to one aspect of the invention, a screed assembly for a road paver is provided. The screed assembly comprises a main screed and a secondary screed. The main screed comprises a main screed screed plate for contacting paving material. The secondary screed comprises a screed plate carrier and a secondary screed screed plate. The secondary screed plate is configured for contacting the paving material. The secondary screed plate is attached to the screed plate carrier so as to be tiltable about a tilt axis. The screed assembly comprises a height adjustment device and a tilting device. The height adjustment device is configured to lower or raise the screed plate carrier relative to the main screed. The tilting device is configured to change a tilt angle of the secondary screed plate about the tilting axis. According to a first variant, the height adjustment device and the tilting device are functionally coupled in such a way that the tilting device is automatically actuated to change the tilting angle of the secondary screed screed plate about the tilting axis when the screed plate support is lowered or raised relative to the main screed by the height adjustment device. According to a second variant, the height adjustment device and the tilting device are functionally coupled in such a way that the height adjustment device is automatically actuated to lower or raise the screed plate support relative to the main screed when the tilting angle of the secondary screed screed plate about the tilting axis is changed by the tilting device. The functional coupling of the height adjustment device and the tilting device can be designed according to the first variant and/or the second variant.

The screed assembly can be configured to form a road paver together with a towing vehicle. The screed assembly can be attachable to the towing vehicle in order to be towed by the towing vehicle. The screed assembly can be configured to be towed behind the towing vehicle in the paving direction of travel.

The screed arrangement can be configured to compact paving material, in particular bituminous paving material, on a subgrade. The screed arrangement can be configured to smooth paving material, in particular bituminous paving material, on a subgrade.

A transverse direction is defined as a direction extending in a horizontal plane and perpendicular to the installation direction of travel. A lateral direction or a width direction may be a direction parallel to the transverse direction.

The tilting axis can run transversely to the installation direction. The tilting axis can run parallel to the transverse direction.

The secondary screed screed plate may extend at least partially laterally outside the main screed screed plate. The secondary screed may be configured to provide a paving width that is larger than the paving width of the main screed.

The secondary screed can be designed to be displaceable along the transverse direction relative to the main screed. The secondary screed can be designed as an extension part which can be extended outwards from the main screed in the transverse direction to widen the overall paving width of the paving screed arrangement. The paving screed arrangement can comprise a paving width adjustment which is configured to move the secondary screed in the transverse direction relative to the main screed.

As an alternative to a secondary beam that can be moved transversely relative to the main beam, the secondary beam can be attached to the main beam so that it cannot be moved transversely. At least part of the secondary beam can be rigidly connected to the main beam.

The secondary screed can be arranged completely or partially in front of the main screed in relation to the paving direction. The secondary screed can be arranged completely or partially behind the main screed in relation to the paving direction. The secondary screed can extend beyond the main screed along the paving direction. The secondary screed can extend beyond the main screed against the paving direction.

The secondary screed screed can be arranged completely or partially in front of the main screed screed in relation to the direction of travel. The secondary screed screed can be arranged completely or partially behind the main screed in relation to the direction of travel. The main screed and the secondary screed can be arranged strictly one behind the other (without overlap) or with an overlap along the direction of travel. The secondary screed can be arranged directly to the Connect the main screed screed plate. A distance between the main screed screed plate and the secondary screed screed plate along the paving direction can be, for example, less than 50 cm, or less than 20 cm, or less than 10 cm, or less than 5 cm, or between 15 cm and 90 cm. In particular, a distance between the main screed screed plate and the secondary screed screed plate along the paving direction can be, for example, 20 cm or 40 cm or 55 cm or 85 cm.

A length of the main screed screed along the paving direction may differ from a length of the secondary screed screed along the paving direction. The length of the secondary screed screed along the paving direction may be smaller than the length of the main screed screed along the paving direction. The length of the secondary screed screed along the paving direction may be a maximum of 80%, or a maximum of 70%, or a maximum of 60%, or a maximum of 50% of the length of the main screed screed along the paving direction. The length of the secondary screed screed along the paving direction may be at least 20%, or at least 30%, or at least 40%, or at least 50% of the length of the main screed screed along the paving direction. The length of the secondary screed screed along the paving direction may be between 30% and 70%, or between 40% and 60%, or between 45% and 55% of a length of the main screed screed along the paving direction. The length of the secondary screed screed along the paving direction may be at least substantially 50% of the length of the main screed screed along the paving direction.

The length of the main screed screed along the paving direction may at least substantially correspond to the length of the secondary screed screed along the paving direction.

The length of the main screed screed along the paving direction may be smaller than the length of the secondary screed screed along the paving direction.

The secondary screed can be configured to be inclined overall about an axis extending parallel to the paving direction. The secondary screed can be configured to be inclined relative to the main screed about an axis extending parallel to the paving direction. By inclining the secondary screed about an axis extending parallel to the paving direction, for example, the installation of a roof profile or an inclined road surface can be simplified.

The screed assembly may be configured to be tiltable as a whole about an overall axis extending parallel to the transverse direction. A tilting position of the screed assembly as a whole about the overall axis may determine an angle of attack of the main screed screed plate relative to a horizontal plane. The angle of attack of the main screed screed plate can influence the degree of compaction by the main screed. A larger angle of attack of the main screed screed plate can result in a greater degree of compaction.

If the screed arrangement tilts around the overall axis, a height offset can occur between a rear edge of the main screed screed plate and a rear edge of the secondary screed screed plate. Such a height offset can lead to an undesirable step in the installed surface during paving. A height offset between a rear edge of the main screed screed plate and a rear edge of the secondary screed screed plate can be compensated for by lowering or raising the secondary screed screed plate support relative to the main screed using the height adjustment device.

When the screed plate support is lowered or raised by the height adjustment device, the tilting axis can be lowered or raised along with it. When the screed plate support is lowered or raised by the height adjustment device, the secondary screed plate can be lowered or raised along with it. The height adjustment device can be configured to lower or raise the screed plate support, the secondary screed plate, and the tilting axis together relative to the main screed. The height adjustment device can be configured to lower or raise the screed plate support, the secondary screed plate, and the tilting axis together as a unit relative to the main screed.

A height difference between a front edge of the main screed screed plate and a rear edge of the main screed screed plate may be referred to as the main screed retraction height. A height difference between a front edge of the secondary screed screed plate and a rear edge of the secondary screed screed plate may be referred to as the secondary screed retraction height.

For example, if the screed arrangement tilts around the overall axis and/or if the screed plate support is raised or lowered relative to the main screed using the height adjustment device, the retraction height of the secondary screed screed plate may differ from the retraction height of the main screed screed plate. This may undesirably lead to the paving material being compacted to different degrees in the area of the main screed and in the area of the secondary screed.

The tilting device can be configured to change an angle of attack of the secondary screed screed by changing the tilting angle of the secondary screed screed about the tilting axis. The tilting device can be configured to change a retraction height of the secondary screed screed by changing the tilting angle of the secondary screed screed about the tilting axis, in particular to match a retraction height of the main screed screed. The tilting device can be configured to change an angle of attack of the secondary screed screed and thus also a retraction height of the secondary screed screed by changing the tilting angle of the secondary screed screed about the tilting axis.

By coupling the height adjustment device with the tilting device, the adjustment process of the secondary screed during operation can be simplified. By coupling the height adjustment device and the tilting device, operating errors can be avoided or reduced.

The height adjustment device and the tilting device can be coupled in such a way that the lowering or raising of the screed support relative to the main screed by the height adjustment device and the associated change in the tilt angle of the secondary screed screed by the tilting device take place simultaneously. The height adjustment device and the tilting device can be coupled in such a way that the change in the tilt angle of the secondary screed screed by the tilting device and the associated lowering or raising of the screed support relative to the main screed by the height adjustment device take place simultaneously. If the lowering or raising of the screed support relative to the main screed and the change in the tilt angle of the secondary screed screed about the tilting axis take place simultaneously, the time required for an adjustment process for the secondary screed screed can be shortened, which can in particular lead to an improved paving result.

The height adjustment device and the tilting device can be coupled in such a way that the lowering or raising of the screed support relative to the main screed by the height adjustment device is in a fixed ratio to the changing of the tilting angle of the secondary screed screed about the tilting axis by the tilting device. The fixed ratio can be suitably selected based on a geometry of the main screed and the secondary screed and a mutual arrangement of the main screed and the secondary screed.

The height adjustment device and the tilting device can be coupled in such a way that when the screed plate support is lowered or raised relative to the main screed by the height adjustment device, the tilting device is automatically actuated to change the tilting angle of the secondary screed screed plate about the tilting axis in such a way that a difference between a retraction height of the main screed screed plate and a retraction height of the secondary screed screed plate is partially or completely compensated.

By automatically activating the tilting device when lowering or raising the screed support relative to the main screed, the adjustment process of the secondary screed can be simplified during operation. Due to the coupling of the height adjustment device with the tilting device, lowering or raising the screed support relative to the main screed can always immediately change the tilting angle of the secondary screed screed around the tilting axis. A separate adjustment of the tilting angle of the secondary screed screed around the tilting axis can be omitted or simplified.

In particular, if the secondary screed screed plate is completely or partially located in front of the main screed screed plate along the paving direction, the height adjustment device and the tilting device can be coupled in such a way that lowering of the screed support by the height adjustment device actuates the tilting device for tilting the secondary screed screed about the tilting axis to increase an angle of attack of the secondary screed screed in relation to a subgrade. In particular, if the secondary screed screed is completely or partially located in front of the main screed screed along the paving direction, the height adjustment device and the tilting device can be coupled in such a way that raising of the screed support by the height adjustment device actuates the tilting device for tilting the secondary screed screed about the tilting axis to reduce an angle of attack of the secondary screed screed in relation to a subgrade.

In particular, when the secondary screed screed lies completely or partially behind the main screed screed along the paving direction of travel, the height adjustment device and the tilting device can be coupled in such a way that lowering the screed plate support by the height adjustment device actuates the tilting device to tilt the secondary screed screed about the tilting axis to reduce an angle of attack of the secondary screed screed in relation to a subgrade. In particular, when the secondary screed screed lies completely or partially behind the main screed screed along the paving direction of travel, the height adjustment device and the tilting device can be coupled in such a way that raising the screed plate support by the height adjustment device actuates the tilting device to tilt the secondary screed screed about the tilting axis to increase an angle of attack of the secondary screed screed in relation to a subgrade.

The height adjustment device and the tilting device can be coupled in such a way that when the tilting angle of the secondary screed screed plate is changed about the tilting axis by the tilting device, the height adjustment device is automatically actuated to lower or raise the screed plate support relative to the main screed in such a way that a height difference between a rear edge of the main screed screed plate and a rear edge of the secondary screed screed plate is partially or completely compensated.

By automatically activating the height adjustment device when changing the tilt angle of the secondary screed screed plate around the tilt axis, the adjustment process of the secondary screed can be simplified during operation. Due to the coupling of the height adjustment device with the tilt device, changing the tilt angle of the secondary screed screed plate around the tilt axis can always cause the screed plate support to be lowered or raised relative to the main screed. A separate lowering or raising of the screed plate support relative to the main screed can be omitted or simplified.

In particular, if the secondary screed screed plate is completely or partially located in front of the main screed screed plate along the paving direction, the height adjustment device and the tilting device can be coupled in such a way that the secondary screed screed plate cannot be tilted by the tilting axis actuates the height adjustment device for lowering the screed support in order to increase an angle of attack of the secondary screed screed in relation to a subgrade by means of the tilting device. In particular, if the secondary screed screed is completely or partially located in front of the main screed screed along the paving direction of travel, the height adjustment device and the tilting device can be coupled in such a way that tilting the secondary screed screed about the tilting axis actuates the height adjustment device for raising the screed support in order to reduce an angle of attack of the secondary screed screed in relation to a subgrade by means of the tilting device.

In particular, when the secondary screed screed lies completely or partially behind the main screed screed along the paving direction of travel, the height adjustment device and the tilting device can be coupled in such a way that tilting the secondary screed screed about the tilting axis to reduce an angle of attack of the secondary screed screed in relation to a subgrade by the tilting device actuates the height adjustment device for lowering the screed plate support. In particular, when the secondary screed screed lies completely or partially behind the main screed screed along the paving direction of travel, the height adjustment device and the tilting device can be coupled in such a way that tilting the secondary screed screed about the tilting axis to increase an angle of attack of the secondary screed screed in relation to a subgrade by the tilting device actuates the height adjustment device for raising the screed plate support.

Preferably, a region of the secondary screed screed plate located at the rear in the direction of installation is mounted on the tilting axis. For example, a connection between the tilting axis and the secondary screed screed plate can be provided at the rear 20%, or at the rear 10% or at the rear 5% of a length of the secondary screed screed plate in the direction of installation. The further back the secondary screed screed plate is mounted on the tilting axis, the less the height of the rear edge of the secondary screed screed plate changes when the tilting angle of the secondary screed screed plate changes around the tilting axis.

The tilting device can be configured to raise or lower an end of the secondary screed screed plate opposite the tilting axis in order to change the tilting angle of the secondary screed screed plate relative to the screed plate support. The end of the secondary screed screed plate opposite the tilting axis can be a front end of the secondary screed screed plate with respect to the paving direction. By raising or lowering the front end of the secondary screed screed plate, a degree of compaction achieved by the secondary screed can be changed.

The tilting device may comprise an actuating connection. The actuating connection may be connected to the secondary screed screed plate. The actuating connection may be configured to lower or raise the screed plate carrier by The height adjustment device automatically rotates the auxiliary screed screed around the tilting axis.

The actuating connection can be connected to a front region, in particular a front end, of the secondary screed screed plate with respect to the paving direction of travel.

A connection position between the secondary screed screed plate and the actuating connection can be spaced apart along or against the paving direction from a connection position between the secondary screed screed plate and the tilting axis, in particular by at least 80%, or at least 70%, or at least 50%, or at least 40%, or at least 30% of a length of the secondary screed screed plate along the paving direction. Due to a leverage effect, the spaced apart connection positions can promote a force transmission through the actuating connection to the secondary screed screed plate to change the tilting angle of the secondary screed screed plate about the tilting axis.

The height adjustment device and the tilting device can be coupled such that lowering or raising the screed support relative to the main screed by a support adjustment length actuates the tilting device to lower or raise a front end of the secondary screed screed relative to the screed support by a screed adjustment length.

The height adjustment device and the tilting device can be coupled such that lowering or raising a front end of the secondary screed screed plate relative to the screed plate carrier by a screed plate adjustment length actuates the height adjustment device to lower or raise the screed plate carrier relative to the main screed by a carrier adjustment length.

The screed plate adjustment length can be proportional to the carrier adjustment length.

A proportionality factor between the screed plate adjustment length and the beam adjustment length can be selected such that a retraction height of the secondary screed plate is adjusted to a retraction height of the main screed plate by lowering or raising the front end of the secondary screed plate when the screed plate beam is lowered or raised by the beam adjustment length by the height adjustment device.

A proportionality factor between the screed plate adjustment length and the beam adjustment length may be selected such that a height of a rear edge of the secondary screed plate is adjusted to a height of a rear edge of the main screed plate by lowering or raising the screed plate beam when the front end of the secondary screed plate is lowered or raised.

The proportionality factor between the beam adjustment length and the screed plate adjustment length may at least substantially correspond to a ratio between a length of the main screed screed plate in the direction of paving and a length of the secondary screed screed plate in the direction of paving. For example, if the length of the main screed screed plate in the direction of paving corresponds to twice the length of the secondary screed screed plate in the direction of paving, the beam adjustment length can correspond to twice the screed plate adjustment length. In this case, the secondary screed screed plate can directly connect to the main screed screed plate, particularly along the direction of paving.

The screed assembly may include a drive. The drive may be configured to lower or raise the screed carrier relative to the main screed. The drive may include, for example, a spindle drive.

The drive can be coupled to the tilting device. The drive can drive the tilting device. If the drive drives both the height adjustment device and the tilting device, the height adjustment device can be coupled to the tilting device in a particularly cost-effective, efficient and reliable manner.

The drive can be configured to drive the height adjustment device with a first gear ratio. The drive can be configured to drive the tilting device with a second gear ratio. The first gear ratio can differ from the second gear ratio. The first gear ratio and/or the second gear ratio can be adaptable, in particular adjustable. The first gear ratio and/or the second gear ratio can be adjustable according to installation conditions or default values.

The functional coupling of the height adjustment device and the tilting device can comprise a mechanical coupling. Alternatively or additionally, the functional coupling of the height adjustment device and the tilting device can comprise a non-mechanical coupling.

The functional coupling of the height adjustment device and the tilting device can comprise a coupling implemented in terms of control technology. A coupling implemented in terms of control technology can, for example, actuate the height adjustment device and additionally the tilting device based on a user input for controlling the height adjustment device. A coupling implemented in terms of control technology can, for example, actuate the tilting device and additionally the height adjustment device based on a user input for controlling the tilting device. A coupling implemented in terms of control technology can, for example, actuate both the height adjustment device and the tilting device based on a user input, in particular a single user input, in particular actuate them in a coordinated manner. Separate actuation of the height adjustment device and the tilting device by means of a separate user input can be omitted.

The functional coupling of the height adjustment device and the tilting device can comprise an electronic coupling or a hydraulic coupling.

The height adjustment device can be configured to increase a distance between a support frame and a support structure mounted at a fixed height with respect to the main screed by a first length in order to lower the screed support relative to the main screed and, in particular at the same time, to increase a distance between the support frame and the screed support by a second length. The height adjustment device can be configured to reduce a distance between the support frame and the support structure by a third length in order to raise the screed support relative to the main screed and, in particular at the same time, to reduce the distance between the support frame and the screed support by a fourth length. A ratio of the first length to the second length can correspond to a ratio of the third length to the fourth length.

The tilting device may comprise an actuating connection. The actuating connection may connect the support frame to the secondary screed screed plate.

The confirmation connection may be connected to the support frame at a first attachment point. The actuation connection may be connected to the secondary screed screed at a second attachment point. The actuation connection may connect the support frame to the secondary screed screed such that a distance between the first attachment point and the second attachment point is kept constant.

When the screed plate support is lowered relative to the main screed by the height adjustment device, the second attachment point can be raised relative to the screed plate support by a distance that corresponds to the second length. When the screed plate support is raised relative to the main screed by the height adjustment device, the second attachment point can be lowered by a distance that corresponds to the second length.

A ratio of the first length to the second length can be 1:1.

The screed arrangement can comprise a tilt adjustment device. The tilt adjustment device can allow the tilt angle of the secondary screed screed plate to be changed about the tilt axis without actuating the height adjustment device. The tilt adjustment device can allow the tilt angle of the secondary screed screed plate to be readjusted about the tilt axis, for example in order to adjust the angle of attack of the secondary screed screed plate relative to the subgrade. The tilt adjustment device can allow the setting of an offset of the tilt angle of the secondary screed screed plate about the tilt axis.

According to a further aspect of the present invention, a road finisher is provided. The road finisher comprises a towing vehicle and the described screed arrangement. The towing vehicle can comprise a material hopper for receiving paving material. The material hopper is preferably located at the front of the towing vehicle in the paving direction. The screed arrangement is preferably attached to the rear of the towing vehicle in the paving direction.

The road finisher can comprise a material transport device. The material transport device can be configured to transport paving material from the material hopper to the rear against the paving direction and to present it to the paving screed. The road finisher can comprise a transverse distribution device, in particular a distribution auger. The transverse distribution device can be configured to distribute paving material in front of the paving screed in the transverse direction.

• Fig. 1 zeigt eine schematische Seitenansicht eines Straßenfertigers mit einer Einbaubohlenanordnung gemäß einer Ausführungsform.
• Fig. 2 zeigt eine schematische Draufsicht auf eine Einbaubohlenanordnung gemäß einer Ausführungsform.
• Fig. 3 zeigt eine schematische Perspektivansicht einer Einbaubohlenanordnung gemäß einer Ausführungsform.
• Fig. 4 zeigt eine schematische Ansicht der Einbaubohlenanordnung der Ausführungsform aus Fig. 3 im Bereich der Nebenbohle in Blickrichtung entgegen der Einbaufahrtrichtung.
• Fig. 5 zeigt eine schematische Darstellung der Einbaubohlenanordnung der Ausführungsform aus Fig. 3 im Bereich der Nebenbohle in Blickrichtung seitlich auf die Einbaubohlenanordnung.
• Fig. 6 ist eine schematische Darstellung zur Erläuterung der Verstellvorgänge an einer Einbaubohlenanordnung gemäß einer Ausführungsform.
• Fig. 7 zeigt eine schematische Darstellung einer Einbaubohlenanordnung gemäß einer alternativen Ausführungsform in Blickrichtung entgegen der Einbaufahrtrichtung.
• Fig. 8 zeigt eine schematische Darstellung einer Einbaubohlenanordnung gemäß einer weiteren alternativen Ausführungsform in Blickrichtung entgegen der Einbaufahrtrichtung.
• Fig. 9 zeigt eine schematische Darstellung einer Einbaubohlenanordnung gemäß einer weiteren alternativen Ausführungsform in Blickrichtung entgegen der Einbaufahrtrichtung.
• Fig. 10 zeigt eine schematische Darstellung einer Einbaubohlenanordnung gemäß einer weiteren alternativen Ausführungsform.

In the following, the invention is explained in more detail using embodiments.

• Fig. 1 shows a schematic side view of a road paver with a screed arrangement according to an embodiment.
• Fig. 2 shows a schematic plan view of a screed arrangement according to an embodiment.
• Fig. 3 shows a schematic perspective view of a screed arrangement according to an embodiment.
• Fig. 4 shows a schematic view of the screed arrangement of the embodiment from Fig. 3 in the area of the secondary screed in the direction opposite to the paving direction.
• Fig. 5 shows a schematic representation of the screed arrangement of the embodiment from Fig. 3 in the area of the secondary screed, looking laterally towards the screed arrangement.
• Fig. 6 is a schematic representation for explaining the adjustment processes on a screed arrangement according to an embodiment.
• Fig. 7 shows a schematic representation of a screed arrangement according to an alternative embodiment, viewed opposite to the paving direction.
• Fig. 8 shows a schematic representation of a screed arrangement according to a further alternative embodiment, viewed opposite to the paving direction.
• Fig. 9 shows a schematic representation of a screed arrangement according to a further alternative embodiment, viewed opposite to the paving direction.
• Fig. 10 shows a schematic representation of a screed arrangement according to a further alternative embodiment.

Figure 1 shows a road finisher 1 according to an embodiment. The road finisher 1 comprises a towing vehicle 3 and a screed arrangement 7 pulled behind the towing vehicle 3 via tow bars 5. The screed arrangement 7 is in Figure 1 shown schematically and can be designed according to all described embodiments.

The towing vehicle 3 comprises a material hopper 11 located at the front with respect to the installation direction 9 for receiving installation material. The installation material is transported to the rear by a material transport device of the towing vehicle 3 against the installation direction 9 and the screed arrangement 7. A transverse distribution device 13 in the form of a distribution auger is provided at the rear of the towing vehicle 3, which distributes the paving material in front of the screed arrangement 7 along a transverse direction 14, which is parallel to a horizontal plane and perpendicular to the paving direction 9.

Figure 2 shows a schematic plan view of a screed arrangement 7 according to an embodiment. The screed arrangement 7 comprises a main screed 15 and two secondary screeds 17. In the embodiment shown, the screed arrangement 7 is designed as an extendable screed arrangement. The secondary screeds 17 can be moved along the transverse direction 14 relative to the main screed 15 in order to change an overall paving width of the screed arrangement 7. In Figure 2 the right-hand side screed 17, seen along the paving direction 9, is shown in a fully retracted state in which it does not increase the overall paving width of the screed arrangement 7. The left-hand side screed 17, seen along the paving direction 9, is shown in an extended state in which it increases the overall paving width of the screed arrangement 7. Intermediate states are also conceivable.

In the Figure 2 In the embodiment shown, the secondary planks 17 are positioned in front of the main plank 15 with respect to the paving direction 9. Alternatively, the secondary planks 17 could be positioned behind the main plank 15 with respect to the paving direction 9 or at least partially positioned next to the main plank 15.

Figure 3 shows a schematic perspective view of the screed arrangement 7 according to an embodiment in the direction opposite to the paving direction 9. The screed arrangement 7 is located in the Figure 2 shown configuration, i.e. the left side screed 17 seen along the paving direction 9 is extended to the side and the right side screed 17 seen along the paving direction 9 is not extended. In Figure 3 Sliding devices 19 are shown, with which the secondary beams 17 can each be moved along the transverse direction 14.

The secondary screeds 17 each comprise a secondary screed smoothing plate 21, which comes into contact with the paving material in order to compact and smooth it. Accordingly, the main screed 15 comprises a main screed smoothing plate 23, which comes into contact with the paving material in order to compact and smooth it. In the embodiment shown, a length of the main screed smoothing plate 23 in the paving direction 9 corresponds to twice the length of the secondary screed smoothing plate 21 in the paving direction 9.

Figure 4 shows a schematic view of the screed arrangement 7 in the area of the extended secondary screed 17 in the direction opposite to the paving direction 9. The secondary screed 17 comprises a support structure 25 which is at a fixed height in relation to the main screed 15 is provided. In addition, the secondary screed 17 comprises a screed plate carrier 27. The secondary screed screed plate 21 is attached to the screed plate carrier 27. The screed plate carrier 27 is guided via a guide structure 29 so that its height can be adjusted relative to the support structure 25 and thus relative to the main screed 15. A height adjustment device 31 allows the screed plate carrier 27 to be raised and lowered relative to the support structure 25 and thus relative to the main screed 15. The height adjustment device 31 comprises a drive 33 in the form of a motor which drives two identical spindle arrangements 35 in a synchronized manner via chains. The drive 33 is provided on a support frame 37. The spindles 35 are each designed as spindles with opposing threads which connect the screed plate carrier 27 and the support structure 25 to one another.

To lower the screed support 27 with respect to the main screed 15, the drive 33 drives the spindles 35 to increase the distance between the screed support 27 and the support frame 37 and the distance between the support frame 37 and the support structure 25. When the distance between the support frame 37 and the support structure 25 is increased by a first length, the distance between the support frame 37 and the screed support 27 is increased by a second length. The ratio between the first length and the second length results from a thread ratio of the corresponding spindle sections and is 1:1 in the embodiment shown.

In order to raise the screed support 27 relative to the support structure 25 and thus relative to the main screed 15, the drive 33 drives the spindles 35 to reduce the distance between the support frame 37 and the support structure 25 and the distance between the support frame 37 and the screed support 27. If the distance between the support frame 37 and the support structure 25 is reduced by a third length, the distance between the support frame 37 and the screed support 27 is reduced by a fourth length. The ratio between the third length and the fourth length results from a thread ratio of the corresponding spindle sections and is 1:1 in the embodiment shown.

Figure 5 shows a schematic side view of the screed arrangement 7 looking along the transverse direction 14. As can be seen from Figure 5 As can be seen, the screed arrangement 7 can be tilted by means of a tilt adjustment 39 about an overall axis extending parallel to the transverse direction 14. The secondary screed screed plate 21 is attached to the screed plate support 27 so that it can be tilted about a tilting axis 41. The connection between the secondary screed screed plate 21 and the tilting axis 41 is located in a rear area of the secondary screed screed plate 21 with respect to the paving direction 9.

As from Figure 4 As can be seen, the support frame 37 and the secondary screed screed plate 21 are connected to each other by two identically designed actuating connections 43. In particular, a front area of the screed plate 21 with respect to the installation direction 9 is connected to the Actuating connections 43 are connected to the support frame 37. The actuating connections 43 represent a tilting device 45 with which the secondary screed screed plate 21 can be tilted about the tilting axis 41.

Because the actuating connection 43 is connected to the support frame 37, the height adjustment device 31 and the tilting device 45 are coupled.

When the screed support 27 is lowered by the height adjustment device 31, the support frame 37 moves downwards relative to the support structure 25 by the first length. Thus, the front area of the secondary screed screed 21, which is connected to the support frame 37 via the actuating connection 43, also moves downwards relative to the support structure 25 by the first length. The screed support 21 and the tilting axis 41, and thus also the rear end of the secondary screed screed 21 with respect to the paving direction 9, move downwards by the sum of the first length and the second length. This results in a relative lifting of the front end of the secondary screed screed 21 relative to the rear end of the secondary screed screed 21 by the second length. When the screed plate support 27 is lowered, this results in a simultaneous tilting of the secondary screed plate 21 about the tilting axis 41 in order to increase an angle of attack between the secondary screed plate 21 and a horizontal plane or a subgrade.

When the screed plate support 27 is raised by the height adjustment device 31, the support frame 37 moves upwards by the third length relative to the support structure 25. The front area of the secondary screed screed plate 21, which is connected to the support frame 37 via the actuating connection 43, therefore also moves upwards by the third length relative to the support structure 25. The screed plate support 21 and the tilting axis 41, and thus also the rear end of the secondary screed screed plate 21 with respect to the paving direction 9, however, move upwards by the sum of the third length and the fourth length. This results in a relative lowering of the front end of the secondary screed screed plate 21 relative to the rear end of the secondary screed screed plate 21 by the fourth length. When the screed plate support 27 is raised, this results in a simultaneous tilting of the secondary screed plate 21 about the tilting axis 41 in order to reduce an angle of attack between the secondary screed plate 21 and a horizontal plane or a subgrade.

Figure 6 is a schematic representation to explain the application of the invention in an installation process. In part A of Figure 6 the paving process runs in a state of equilibrium. Paving material is laid on a subgrade 47, whereby the paving surface behind the paving screed arrangement 7 has a height level 49. The height level 49 is defined by the height of the rear edge 51 of the main screed screed plate 23 and the height of the rear edge 53 of the secondary screed screed plate 21. The rear edge 51 of the main screed screed plate 23 and the rear edge 53 of the secondary screed screed plate 21 are in the area shown in part A of Fig. 6 shown equilibrium state at the same height. In part A of Figure 6 a front edge 55 of the main screed screed plate 23 and a front edge 57 of the secondary screed screed plate 21 are also at a common height level, the height level 59, so that in the area of the main screed 15 and in the area of the secondary screed 17 at least substantially the same compaction results.

Part B of Figure 6 shows the situation after the screed arrangement 7 has been rotated as a whole about an overall axis extending parallel to the transverse direction 14. This can occur, for example, due to changing properties of the paving material or due to a changing paving thickness. Due to the overall tilting of the screed arrangement 7, the rear edge 51 of the main screed screed plate 23 and the rear edge 53 of the secondary screed screed plate 21 are no longer at the same height level. In the situation shown, the rear edge 51 of the main screed screed plate 23 is at a higher height level 61 than the height level 63 on which the rear edge 53 of the secondary screed screed plate 21 is located. This results in a gradation in the paving surface.

By operating the height adjustment device 31 to raise the screed plate support 27, the rear edge 53 of the secondary screed plate 21 can be brought to the height level 61 of the rear edge 51 of the main screed plate 23 in order to restore a level surface. As explained above, when the screed plate support 27 is raised, the secondary screed plate 21 is raised as a whole due to the coupling between the height adjustment device 31 and the tilting device 45 (arrow 65 in part B of Figure 6 ) and the secondary screed screed plate 21 are tilted about the tilting axis 41, so that the angle of attack of the secondary screed screed plate 21 is reduced compared to the subgrade 47 (arrow 67 in part B of Figure 6 ). The tilting axis 41 is located essentially in the area of the rear edge 53 of the secondary screed screed plate.

Part C of Figure 6 shows the situation after the screed support 27 has been raised by the height adjustment device 31. The rear edge 53 of the secondary screed screed 21 was raised to the height level 61 of the rear edge 51 of the main screed screed 23. At the same time, the secondary screed screed 21 was tilted about the tilting axis 41 so that the front edge 57 of the secondary screed screed 21 is at the same height level 69 as the front edge 55 of the main screed screed 23. This creates a flat surface again and with at least essentially constant compaction.

Figure 7 shows an alternative embodiment. The embodiment of Figure 7 In its function and structure, it essentially corresponds to that described in the Figures 3 to 5 For reasons of clarity, only differences to the embodiment shown in the Figures 3 to 5 In the embodiment according to Figure 7 is a tilt adjustment device 71 between the actuating connections 43 and the support frame 37. The inclination adjustment device 71 allows a height adjustment of the actuating connections 43 in relation to the support frame 37 via a threaded rod 72 and rockers 74. The inclination adjustment device 71 thus allows a particularly manual change of the tilt angle of the secondary screed screed plate 21 about the tilt axis 41 without actuating the height adjustment device 31. The inclination adjustment device 71 can be used, for example, to correct the angle of attack of the secondary screed screed plate 21.

Figure 8 shows another alternative embodiment. The embodiment of Figure 8 In its function and structure, it essentially corresponds to that in Figure 7 For reasons of clarity, only differences to the embodiment shown in Figure 7 The embodiment shown in the drawing is also discussed in the embodiment of Figure 8 A tilt adjustment device 71 is provided, which allows a manual change of the tilt angle of the secondary screed screed plate 21 about the tilt axis 41 without actuating the height adjustment device 31. In the embodiment of Figure 8 However, this is not done by adjusting the height of the actuating connections 43 in relation to the support frame 37, but by tilting the actuating connections 43 from a vertical orientation. The inclination adjustment device 71 comprises a threaded rod 72 which is mounted in bearings 76 for movement along the transverse direction 14. The actuating connections 43 are pivotally connected to the threaded rod 72 at articulation points 78 about axes extending parallel to the installation direction 9. When the threaded rod 72 moves along the transverse direction 14, the articulation points 78 move along the transverse direction 14, whereby the actuating connections 43 are inclined relative to a vertical direction and, due to the constant length of the actuating connections 43, a front region of the secondary screed screed plate 21 is raised or lowered relative to the support frame 37.

Figure 9 shows another alternative embodiment. The embodiment of Figure 9 In its function and structure, it essentially corresponds to that described in the Figures 3 to 5 For reasons of clarity, only differences to the embodiment shown in the Figures 3 to 5 In the embodiment according to Fig. 9 the actuating connections 43 between the support frame 37 and the front area of the secondary screed screed plate 21 are not present. Instead, an actuating connection 81 is provided which connects the front area of the secondary screed screed plate 21 to the support structure 25. The actuating connection 81 represents a tilting device 45. The actuating connection 81 comprises a lever arrangement 83 with a lever 85 hinged to the screed plate support 27. If a distance between the support structure 25 and the screed plate support 27 is changed by the height adjustment device 31 when the screed plate support 27 is lowered or raised, a position of the lever arrangement 83 changes so that the front area of the secondary screed screed plate 21 is raised or lowered. By designing the lever arrangement 83 to match the geometry of the screed arrangement 7, it is achieved that when the screed plate support 27 is lowered or raised relative to the main screed 15 by the height adjustment device 31, the tilting device 45 is automatically actuated to change the tilt angle of the secondary screed screed plate 21 about the tilting axis 41 in such a way that a difference between a retraction height of the main screed screed plate 23 and a retraction height of the secondary screed screed plate 21 is partially or completely compensated.

In the embodiments described above, the coupling between the height adjustment device 31 and the tilting device 45 is mechanical. Figure 10 shows schematically an alternative embodiment in which a height adjustment of the screed plate support 27 relative to the main screed 15 is non-mechanically coupled to an adjustment of the tilt angle of the secondary screed screed plate 21 about the tilt axis 41.

In the embodiment of Figure 10 a tilting device 45 with a drive 80 for changing the tilting angle of the secondary screed screed plate 21 about the tilting axis 41 is provided. In addition, a height adjustment device 31 with a drive 82 for lowering or raising the screed plate carrier 27 relative to the main screed 15 is provided. The drives 80, 82 are controlled by a control device 84. The control can be electronic or hydraulic, for example.

The embodiment according to Figure 10 can be operated such that the control device 84 receives an operator input for lowering or raising the screed plate carrier 27 relative to the main screed 15. According to the operator input, the control device 84 can control the height adjustment device 31. In addition, the control device 84 can control the tilting device 45 automatically and based on the same operator input for tilting the secondary screed screed plate 21.

According to another variant, the control device 84 can receive an operator input for adjusting the tilt angle of the secondary screed screed plate 21 about the tilt axis 41. The control device 84 can control the tilting device 45 based on the operator input to change the tilt angle. In addition, the control device 84 can control the height adjustment device 31 based on the same operator input to raise or lower the screed plate carrier 27 relative to the main screed 15.

A relationship between a change in the height of the screed support 27 with respect to the main screed 15 and a change in the tilt angle can be predefined, in particular changeably predefined.

Claims (15)

Screed assembly (7) for a road finisher (1), comprising: a main screed (15) with a main screed screed plate (23) for contact with paving material; and a secondary screed (17) with a screed plate support (27) and a secondary screed plate (21) for contact with the paving material; wherein the secondary screed screed plate (21) is attached to the screed plate carrier (27) so as to be tiltable about a tilting axis (41); wherein the screed assembly (7) comprises a height adjustment device (31) configured to lower or raise the screed plate carrier (27) relative to the main screed (15); wherein the screed assembly (7) comprises a tilting device (45) which is configured to change a tilting angle of the secondary screed screed plate (21) about the tilting axis (41); and wherein the height adjustment device (31) and the tilting device (45) a) are functionally coupled in such a way that when the screed plate carrier (27) is lowered or raised relative to the main screed (15) by the height adjustment device (31), the tilting device (45) is automatically actuated to change the tilting angle of the secondary screed screed plate (21) about the tilting axis (41), and/or b) are functionally coupled in such a way that when the tilting angle of the secondary screed screed plate (21) is changed about the tilting axis (41) by the tilting device (45), the height adjustment device (31) is automatically actuated to lower or raise the screed plate carrier (27) relative to the main screed (15). Screed arrangement according to claim 1, wherein the tilting axis (41) runs transversely to a paving travel direction (9). Screed arrangement according to one of the preceding claims, wherein lowering of the screed plate support (27) by the height adjustment device (31) actuates the tilting device (45) for tilting the secondary screed screed plate (21) about the tilting axis (41) to increase an angle of attack of the secondary screed screed plate (21) with respect to a subgrade (47) and/or wherein raising of the screed plate support (27) by the height adjustment device (31) actuates the tilting device (45) for tilting the secondary screed plate (21) about the tilting axis (41) to reduce an angle of attack of the secondary screed plate (21) with respect to a subgrade (47). Screed arrangement according to claim 1 or 2, wherein lowering of the screed plate support (27) by the height adjustment device (31) actuates the tilting device (45) for tilting the secondary screed screed plate (21) about the tilting axis (41) to reduce an angle of attack of the secondary screed screed plate (21) with respect to a subgrade (47) and/or wherein raising of the screed plate support (27) by the height adjustment device (31) actuates the tilting device (45) for tilting the secondary screed plate (21) about the tilting axis (41) to increase an angle of attack of the secondary screed plate (21) with respect to a subgrade (47). Screed arrangement according to one of the preceding claims, wherein a region of the secondary screed screed plate (21) located at the rear in the paving direction (9) is mounted on the tilting axis (41). Screed assembly according to one of the preceding claims, wherein the tilting device (45) is configured to raise or lower an end of the secondary screed screed plate (21) opposite the tilting axis (41) for changing the tilting angle of the secondary screed screed plate (21) relative to the screed plate carrier (27). Screed arrangement according to one of the preceding claims, wherein the tilting device (45) comprises an actuating connection (43) which is connected to the secondary screed screed plate (21), wherein the actuating connection (43) is configured to automatically rotate the secondary screed screed plate (21) about the tilting axis (41) when the screed plate carrier (27) is lowered or raised by the height adjustment device (31). Screed arrangement according to claim 7, wherein the actuating connection (43) is connected to a front region, in particular a front end, of the secondary screed screed plate (21) with respect to the paving travel direction (9). Screed assembly according to one of the preceding claims, wherein lowering or raising the screed plate carrier (27) by a carrier adjustment length relative to the main screed (15) actuates the tilting device (45) to lower or raise a front end of the secondary screed screed plate (21) relative to the screed plate carrier (27) by a screed plate adjustment length, wherein the screed plate adjustment length is proportional to the carrier adjustment length. Screed arrangement according to claim 9, wherein a proportionality factor between the carrier adjustment length and the screed plate adjustment length at least substantially corresponds to a ratio between a length of the main screed screed plate (23) in the paving direction (9) and a length of the secondary screed screed plate (21) in the paving direction (9). Screed assembly according to one of the preceding claims, wherein the screed assembly (7) comprises a drive (33) which is configured to lower or raise the screed support (27) relative to the main screed (15). Screed arrangement according to claim 11, wherein the drive (33) is coupled to the tilting device (45) and drives the tilting device (45). Screed assembly according to claim 12, wherein the drive (33) drives the height adjustment device (31) with a first gear ratio and drives the tilting device (45) with a second gear ratio different from the first gear ratio. Screed arrangement according to one of the preceding claims, further comprising an inclination adjustment device (71) which allows a change in the tilt angle of the secondary screed screed plate (21) about the tilt axis (41) without actuating the height adjustment device (31). Road paver (1), comprising: a towing vehicle (3) with a material bunker (11) located at the front in the installation direction (9) for receiving installation material, and a screed arrangement (7) according to one of the preceding claims, mounted at the rear of the towing vehicle (3) in the installation direction (9).

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