ROAD PAVER

Abstract

A road paver for producing a pavement layer made of a paving material conveyable in a direction opposite to a paving direction of travel of the road paver to a transverse distributor assembly and distributable by way of the transverse distributor assembly transverse to the paving direction of travel substantially over a working width of a screed. The road paver comprises an exchangeable component configured to contact the paving material at least during operation of the road paver, an attachment unit for the attachment of the exchangeable component to a work assembly or to a chassis of the road paver, and a wear protection for the attachment unit. The wear protection comprises a sacrificial body for mounting onto the attachment unit and/or a protective body with a protective section which is formed to be ramp-shaped or curved at least in sections to guide the paving material over the attachment unit.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims foreign priority benefits under 35 U.S.C. § 119 (a)-(d) to European patent application number EP 23185195.7, filed Jul. 13, 2023, which is incorporated by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to a road paver.

Road pavers are intended for producing a pavement layer from a paving material such as asphalt and generally comprise a chassis as well as work assemblies, such as a material storage, a screed, a conveyor device, a transverse distribution assembly, arranged on the chassis. Road pavers have exchangeable components, each of which is attached in a releasable manner directly to the chassis and/or to the work assemblies by way of a screw connection or several screw connections, that can wear out, and thereafter are exchanged at the end of their service life.

Screw connections generally comprise a screw with a screw head and/or a screw nut. The screw head and/or the screw nut typically have a drive, for example, a hexagon profile or a hexagonal outer or inner profile which can be driven with a wrench to release the screw connection. The problem is that the abrasiveness of the asphalt or other paving materials, such as gravel, can cause the screw heads and/or screw nuts that come into contact with the asphalt to abrade over time. This causes loss of material and shape at the surfaces of the screw connections. The outer contours of the screw connections or the screw heads and/or of the screw nuts lose their angular shape and become rounded so that they can no longer be gripped by commercially available tools (e.g., socket wrenches, ring spanners, open-end wrenches, ratchets with socket attachment). This makes it considerably more difficult to replace the components at the end of their service life. If the attachment elements are so worn/abraded, the components have to be separated from the work assembly or chassis in a laborious manner using an angle grinder.

BACKGROUND

DE 102022102095 A1 describes an asphalt paver with a distributor auger for distributing asphalt forward of a screed. One or more auger segments are coupled to an auger shaft by way of several attachment elements (bolts with bolt head and nut). DE 102022102095 A1 furthermore discloses that the auger segment has a U-shaped receptacle for the attachment elements. The side walls of the receptacle extend straight from the body and define a recess or a U-shaped recess, respectively. DE 102022102095 A1 discloses that the bolt heads and the nuts of the attachment elements are countersunk in their respective recesses. According to DE 102022102095 A1, such an assembly can prevent wear at the attachment elements, since the side walls of the receptacles can provide abrasion protection (wear protection) for the attachment elements from potentially abrasive road surface material or paving material, respectively. However, the attachment elements are surrounded by side walls of the receptacles such that access for a wrench is cumbersome. Even if the attachment element could be released with a two-part tool, for example, with a wrench socket and a socket wrench, such two-part tools are more difficult to use than a single-part wrench. In addition, paving material can accumulate within the recess and cure there, which makes replacing the auger segments even more difficult. Due to the side walls of the U-shaped recess extending straight from the body, the paving material accumulates on the walls of the recess when the auger rotates and leads to an accumulation and entrainment of asphalt into the recess. The asphalt accumulated in the recess must then first be removed for a removing tool to be able to reach the attachment element to release it, which significantly increases the effort involved in exchanging the auger segment.

SUMMARY

An object of the present disclosure is to increase the service life of the attachment units for connecting exchangeable components at road pavers and to simplify the assembly/disassembly of the exchangeable components. This object is satisfied by features according to the disclosure.

The disclosure relates to a road paver for producing a pavement layer made of a paving material that is conveyed in a direction opposite to a paving direction of travel of the road paver from a material storage of the road paver to a transverse distributor assembly of the road paver and distributed by way of the transverse distributor assembly transverse to the paving direction of travel of the road paver substantially over a working width of a screed of the road paver, wherein the road paver comprises an exchangeable component that comes into contact with the paving material at least during the operation of the road paver and at least one attachment unit for the attachment of the exchangeable component to a work assembly or to a chassis of the road paver, wherein a wear protection for the attachment unit is provided at the road paver. The wear protection according to the disclosure has a sacrificial body for mounting onto the attachment unit and/or a protective body with a protective section which is formed to be ramp-shaped or curved at least in sections and guides the paving material over the attachment unit. The attachment unit can have an outer contour, in particular an angular outer contour.

Due to features according to the disclosure, a grinding effect between the attachment unit and the hot and abrasive paving material can advantageously be prevented entirely or reduced. This increases the service life of the attachment unit and protects its outer contour so that the attachment unit can be released by way of a single-piece tool, such as a wrench, and dismantling exchangeable components at the end of their service life or retooling of the road paver is easily possible. This in turn enables the attachment unit to be exchanged in a simple and time-saving manner.

Using a sacrificial body as a top piece on the attachment unit is particularly cost-effective and practical because a sacrificial body can be easily mounted on at least part of the attachment unit. In particular, the sacrificial body in the form of a cap can be mounted onto the part of the attachment unit that can be gripped using a tool, for example, onto a screw nut, in order to “sacrifice” itself to preserve the latter.

The ramp-shaped or curved protective section guides the paving material over the attachment unit, thus forming a guide to direct the paving material in a direction with a reduced grinding effect such that it is guided over the attachment unit to prevent its wear. The ramp-shaped or curved protective section can even accelerate the paving material guided therealong, making it easier to guide it past the attachment unit. In addition to its guiding function, the ramp-shaped or curved protective section can also act as a sacrificial body.

In comparison to the protective section according to the disclosure, however, a recess formed for the attachment unit with side walls arranged in parallel causes a congestion effect because the paving material slows down on the side walls that have just been erected and can therefore accumulate thereon. The paving material that has slowed down and accumulated at the side walls can then easily reach the attachment unit. A protective effect against wear, as achieved by the disclosure, is therefore only possible to a limited extent based on the known accommodation of an attachment unit within a recess. Instead, the known recess is used to secure the hexagon member received therein against rotation.

It would be conceivable to have the attachment unit, in particular a screw head formed thereon, for example, a hexagonal member, be received in a recess. This recess can be dimensioned such that the screw head received therein, in particular the hexagonal member, cannot rotate in the assembled state. The recess can be an integral part of the work assembly, for example, of a drive shaft. The recess is in particular a positive-fit receptacle for the attachment unit on an oppositely disposed side of the wear protection associated with the attachment unit. In addition to the positive effects of the wear protection described above, this also offers optimal locking of the exchangeable component.

The protective body, in particular the protective section, can be arranged only on a side of the attachment unit facing the paving material conveyed. This side can be referred to as the first side of the attachment unit and forms the flank facing a material flow direction at which the protective section is positioned in order to guide the paving material conveyed there towards over the attachment unit. Since the protective section is then erected as a protective shield forward of the attachment unit, i.e., extends only on this side of the attachment unit, a second side of the attachment unit opposite the first side is advantageously freely accessible for a removing tool, for example, for a wrench. This significantly simplifies the exchange of components, because the attachment unit can be released with a single-piece tool, for example, with a wrench.

The attachment unit can comprise a screw with a screw head and/or a screw nut and/or a screw connection composed of a screw and a screw nut, in particular a cap nut. The screw nut can be a hexagonal nut or a cap nut. The screw nut can be attached to the screw or to a screw pin of the screw, respectively. The screw nut and/or the screw head can have a hexagonal profile. The screw can comprise a bolt with a thread.

In particular, the sacrificial body and/or the protective body is configured for being attached to a screw nut.

The attachment unit can be the exchangeable component, for example, an auger blade of the transverse distribution device, with a work assembly, for example, a drive shaft, or another exchangeable component that can be connected in a releasable manner to the chassis of the road paver.

The sacrificial body can be configured such that the sacrificial body completely covers the screw head and/or the screw nut, in particular the cap nut, when the sacrificial body is mounted onto the attachment unit, for example, onto the screw. This allows the attachment unit to be reliably protected against the grinding effect of the abrasive paving material, for example, against frictional wear and heat.

The sacrificial body can comprise a wear-resistant composite material or several wear-resistant composite materials. This can extend the service life of the attachment unit.

The sacrificial body can be made of a wear-resistant composite material or several wear-resistant composite materials. This can extend the service life of the attachment unit.

The sacrificial body can comprise wear-resistant cast alloy or be made of wear-resistant cast alloy. This can extend the service life of the attachment unit. The wear-resistant cast alloy can be selected from the following group: Ni-Hard, EN-GJN-HV600, EN-GJN-HV600 (XCr18) or EN-GJN-HV600 (XCr23).

The sacrificial body can be manufactured from plastic material having high wear resistance and/or heat resistance. The operating temperature of the plastic material can be above 150° C. The operating temperature of the plastic material can vary from 150° C. to 300° C. The sacrificial body can be manufactured from, for example, polyetheretherketone, polyphenylene sulfide, polyethyleneimine, polytetrafluoroethylene.

The sacrificial body can be manufactured from steel having a hardness of at least 50 to 300 HBW, preferably 100 to 150 HBW.

The sacrificial body can have the effect of preventing contact between the attachment unit and the paving material, preferably until the sacrificial body is worn/abraded at least in part.

The sacrificial body can have a reception region with an inner contour that is configured to receive the outer contour of the screw head and/or of the screw nut.

In one embodiment, the wear protection, in particular the sacrificial body, can be a single-piece component. Advantageously, a single-piece component can be easier to handle and/or assemble. The single-piece component can be attached onto the attachment unit without the need for an additional screw connection, for example, by pressing the component onto the attachment unit. Such a component can have approximately the shape of a cap nut that can be mounted onto the screw nut, in particular the cap nut, of the attachment unit.

In an alternative embodiment, the wear protection, in particular the sacrificial body, can be a multi-part construction device. A multi-part construction device can be attached in a releasable manner to the wear protection, for example, by way of a screw connection. This allows the wear protection to be removed from the attachment unit in an advantageous manner if the wear protection is not yet completely worn/abraded at the end of the service life of the exchangeable component (when the component is to be exchanged and the attachment unit is to be released for this purpose). A multi-part construction device can comprise two shells or half-shells, respectively, that are separate from one another or that are connected to one another such that they can rotate about an axis of rotation. After the two components or the two shells, respectively, of the multi-part construction device have been attached onto the attachment unit, the two components can be connected to one another and/or to the attachment by way of one screw connection or two screw connections. It would be conceivable for the wear protection at the attachment unit to be configured in the form of a clamp that is attached thereto in a releasable manner.

The sacrificial body can be attached to the attachment unit in a force-fit manner, regardless of being present as a single-part or a multi-part. Due to the force-fit connection, the protective unit can be firmly mounted on the attachment unit or even completely prevent any movement of the protective unit relative to the attachment unit. This in turn prevents friction between the sacrificial body and the attachment unit. A force-fit connection between the attachment unit and the sacrificial body can be releasable or non-releasable. A force-fit connection between the attachment unit and the sacrificial body can be created by screwing or pressing the sacrificial body onto the edges of the screw head and/or the screw nut. A force-fit connection between the attachment unit and the sacrificial body can be created by elastic and/or plastic deformation of the sacrificial body, in particular at the edges of the screw head and/or the screw nut.

Alternatively, the sacrificial body can be attachable to the attachment unit in a positive-fit manner. A positive-fit connection between the sacrificial body and the attachment unit can be releasable or non-releasable. The positive-fit connection can be a snap/click connection. For the positive-fit connection between the sacrificial body and the attachment unit, the inner contour of the sacrificial body and the outer contour of the attachment unit can respectively have a negative profile and a positive profile. The negative profile and the positive profile can engage with one another such that a motion of the sacrificial body relative to the attachment unit is prevented.

Alternatively, the sacrificial body can be connected to the attachment unit in a positive substance-fit manner. The positive substance-fit connection can be a welded connection, a soldered connection, or an adhesive connection.

The sacrificial body can be in particular a cast member.

The sacrificial body can be cut out of sheet metal.

The protective body, in particular its protective section, can be inclined towards the attachment unit. If the protective section is inclined towards the attachment unit, an inner surface of the protective section and the outer walls of the screw nut are not parallel to one another. If the protective body or the protective section, respectively, is formed to be inclined towards the attachment unit, then an imaginary angle between an inner surface of the protective body or the protective section, respectively, and the outer walls of the screw nut is less than 90 degrees. The protective section can extend over an entire height of the screw head and/or the screw nut.

The protective section can be inclined towards the attachment unit such that contact between the attachment unit and the paving material, in particular in a relative flow direction of the paving material, is prevented, at least no grinding contact leading to wear of the attachment unit occurs.

The protective section can have substantially the shape of a half-shell. A thickness/width of the half-shell can be the same along a length or a thickness.

The protective section can have an inner and an outer side. A distance between the inner side of the protective section and the attachment unit can vary along the inner side.

A recess for receiving the entire screw head and/or the entire screw nut can be present on the inner side of the half-shell.

The protective section can be configured substantially in the form of a shield.

The protective section can comprise an upper end and a lower end. A first distance between the upper end of the protective section and the attachment unit can be shorter than a second distance between the lower end of the protective section and the attachment unit.

The protective section can extend radially from the lower end of the protective section to the upper end of the protective section.

The lower end of the protective section can be connected to an outer surface of a work assembly.

In one embodiment, the protective body can be configured as an extension of the component. This avoids additional work when mounting the protective body to the road paver or to a work assembly of the road paver.

In an alternative embodiment, the protective body can be attached separately from the component, i.e., as a separate component, to the road paver, preferably to a work assembly, in particular to a rotating work assembly, or to the chassis of the road paver. It is advantageous there that the protective body can be mounted/dismantled or exchanged separately from the component.

The protective body, in particular the upper end of the protective section, can extend to an upper end of the attachment unit, in particular of the screw head or of the screw nut. The protective body, in particular the upper end of the protective section, can extend beyond the attachment unit, in particular of the screw head or of the screw nut.

The protective body can be manufactured from steel having a hardness of at least 50 to 300 HBW, preferably 100 to 150 HBW.

The protective body can comprise one wear-resistant composite material or several wear-resistant composite materials. This can extend the service life of the attachment unit.

The protective body can be made of one wear-resistant composite material or several wear-resistant composite materials. This can extend the service life of the attachment unit.

The protective body can comprise wear-resistant cast alloy or be made of wear-resistant cast alloy. This can extend the service life of the attachment unit. The wear-resistant cast alloy can be selected from the following group: Ni-Hard, EN-GJN-HV600, EN-GJN-HV600 (XCr18) or EN-GJN-HV600 (XCr23).

Paving material can be conveyed along a conveying line of the paving material in the conveying direction past several attachment units, for example, out of the material storage through a material tunnel in a tractor of the road paver up to the screed. A respective sacrificial body can be mounted onto all or some of the attachment units. A respective protective body can be arranged next to all or some of the attachment units.

It would be possible to provide a respective protective body for each or for two adjacent attachment units.

The transvers distribution assembly can comprise a shaft. The transverse distributor assembly can comprise a distributor auger that is coupled in a releasable manner to the shaft by way of the attachment unit. The distributor auger can comprise a main body mounted onto the shaft. The distributor auger can comprise a helical auger blade that extends from the main body and extends around the shaft. The distributor auger, at least some segments thereof that come into contact with paving material, can be present as exchangeable components of the road paver, in particular of the transverse distributor assembly of the road paver.

The attachment unit can extend perpendicular to an axis of rotation of the shaft.

The protective body can extend along a direction of curvature that is opposite to the direction of rotation of the auger blade. As a result, the protective body extends in the relative flow direction of the paving material that is conveyed by a rotation of the auger blade. This can in turn reduce the abrasive forces acting upon the protective body caused by the conveyed paving material and protect the protective body itself against wear.

The protective body can be configured as a single piece with the distributor auger, in particular with the main body, in particular as a cast member. This avoids the effort required for additional assembly of the protective body at the transverse distributor assembly.

Alternatively, the protective body can be configured to be separate from the distributor auger as a separate component. As a result, the protective body can be exchanged independently of the distributor auger. The distributor auger can then be manufactured in a more cost-effective manner.

The protective body can surround at least part of the shaft. In other words, the protective body can extend radially around part of the shaft or extend around part of the shaft. As a result, the protective body provides wear protection not only for the attachment unit but also for the shaft.

The protective body can be attached to the shaft. Preferably, a base part of the protective body extends along a circumferential surface of the shaft. The protective section is preferably arranged at a predetermined angle relative to the base part.

The material storage, a conveyor device of the road paver for conveying the paving material from the material storage to the transverse distributor assembly, the transverse distributor assembly or the screed can each be a work assembly of the road paver. The exchangeable component can be a widening part of the screed for the attachment to a screed base body of the screed. The exchangeable component can be a pre-scraper for the attachment to a screed base body of the screed. The exchangeable component can be a channel plate for the attachment to the chassis. As stated above, the exchangeable component can be in particular the distributer auger of the transverse distributor assembly.

The wear protection according to the disclosure can basically be used for the attachment to those attachment units of the road paver that are used for the releasable attachment of a component and that can come into contact therewith during operation of the road paver with regard to the material movement that is caused there.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure shall be explained in more detail according to the following figures by use of embodiments, where:

FIG. 1 shows a side view of a road paver for producing a pavement layer;

FIG. 2 shows a perspective illustration of the road paver with a screed;

FIG. 3 shows a top view of the screed with laterally retracted extension members;

FIG. 4 shows the screed from FIG. 3 with laterally extended extension members;

FIG. 5 shows the screed with the extension members extended as well as the widening parts attached thereto at the side to create a desired working width;

FIG. 6 shows a perspective illustration of a transverse distributor assembly of the road paver;

FIG. 7 shows schematic illustration of embodiments of the attachment unit;

FIG. 8 shows a perspective illustration (partial view) of the transverse distributor assembly with a protective unit in the form of a sacrificial body for the attachment unit;

FIG. 9 shows a schematic illustration of a single-piece embodiment of the sacrificial body;

FIG. 10 shows a schematic illustration of a multi-piece embodiment of the sacrificial body;

FIG. 11 shows a perspective illustration (partial view) of the transverse distributor assembly with wear protection in the form of a protective body for the attachment unit;

FIG. 12 shows a perspective illustration (partial view) of the transverse distributor assembly with an integrally formed protective body;

FIG. 13 shows a schematic illustration (partial view) of the transverse distributor assembly with the integrally formed protective body; and

FIG. 14 shows a perspective illustration (partial view) of the transverse distributor assembly with a separately formed protective body.

DETAILED DESCRIPTION

FIG. 1 shows a road paver 1 for producing a pavement layer 2 on a substrate 3. Road paver 1 comprises a material storage 4 (e.g., hopper) in paving direction of travel R at the front, from which a paving material 6 received therein is transported in the direction opposite to paving direction of travel R of road paver 1 to a screed 7 of road paver 1 by way of a longitudinal conveyor device 5. Longitudinal conveyor device 5 is arranged within a chassis 8 of road paver 1 and comprises a scraper belt 9 (see FIG. 4). Scraper belt 9 comprises a scraper belt section 9a on the left-hand side and a scraper belt section 9b on the right-hand side. Paving material 6 is transferred from scraper belt 9 of longitudinal conveyor device 5 to a transverse distributor assembly 10 which is positioned forward of screed 7. Transverse distributor assembly 10 is configured to distribute paving material 6 forward of screed 7 transverse to paving direction of travel R.

FIG. 2 shows road paver 1 in a perspective illustration. Screed 7 comprises a screed base body 11 and laterally extendable extension members 12 for adjusting a desired working width B of pavement layer 2 produced. By widening screed 7 in this way, a longer working width B can be produced for newly produced pavement layer 2.

FIG. 3 shows a schematic illustration of screed 7 of road paver 1. Paving material 6 deposited by scraper belt 9 forward of screed base body 11 of screed 7, as shown by arrows P, is distributed by transverse distributor assembly 10 along a front side 13 of screed base body 11. A rear wall 14 of chassis 8 of road paver 1 together with front side 13 of screed base body 11 form a transverse distributor channel 15 for transverse distributor assembly 10. This transverse distributor channel 15 can be further expanded laterally in accordance with a widening of screed 7. This is shown in FIG. 4.

FIG. 4 shows screed 7 in a schematic top illustration with extension members 12 extended. By widening screed 7 in this way, a longer working width B can be produced for newly produced pavement layer 2. FIG. 4 shows that transverse distributor channel 15 is extended laterally beyond screed base body 11. Paving material 6 deposited by scraper belt 9 can be transported along widened transverse distributor channel 15 up to the outer sides of extension members 12. Transverse distributor assembly 10 arranged within transverse distributor channel 15 in FIG. 4 is likewise extended.

Transverse distributor channel 15 installed forward of screed 7 is formed at its outer regions to be transverse to paving direction R by way of channel plates 16 supported on chassis 8 of road paver 1 and by way of pre-scrapers 17 attached laterally of screed base body 11. Depending on working width B set, channel plates 16 and pre-scraper 17 can be further extended sideways in order to extend transverse distributor channel 15. The same applies analogously to transverse distributor assembly 10.

FIG. 5 shows screed 7 with extended extension members 12 and widening parts 18 attached laterally thereto for creating a very long working width B for pavement layer 2. FIG. 5 shows that transverse distributor channel 15 is formed along screed base body 11, extension members 12, as well as along widening parts (attachments) 18 attached thereto transverse to paving direction of travel R. In accordance with working width B, further channel plates 16 as well as pre-scrapers 17 were mounted in order to further expand transverse distributor channel 15.

FIG. 6 shows a perspective view of an embodiment of transverse distributor assembly 10. This transverse distributor assembly 10 is attached to the rear end of chassis 8 of a road paver 1. Transverse distributor assembly 10 comprises a distributor auger 19 or a distributor auger 19a on the right-hand side as well as a distributor auger 19b on the left-hand side (in the paving direction of road paver 1). Both distributor augers 19a, 19b are mounted centrally on an auger suspension 20. Disposed in the housing formed by auger suspension 20 is an auger drive (not shown) for driving both distributor augers 19a, 19b. Transverse distributor assembly 10 comprises a shaft 21. This can be two individual shafts 21 (right-hand shaft 21a, left-hand shaft 21b) or a common shaft 21 of both distributor augers 19a, 19b. Distributor auger 19a on the right-hand side is coupled in a releasable manner to shaft 21a. Distributor auger 19b on the left-hand side is coupled in a releasable manner to shaft 21b.

The outer end of each shaft 21a, 21b, i.e., the end facing away from auger suspension 20, is mounted in an auger bearing 22a, 22b. Each auger bearing 22a, 22b is mounted at the lower end of an auger bearing bracket 23a, 23b. These auger bearing brackets 23 there comprise a substantially vertically aligned tube 24a, 24b which is attached to chassis 8 of road paver 1 by way of an attachment plate 25.

Paving material 6 can comprise a cohesive mix, such as asphalt, and/or an unbound mix, such as gravel. The asphalt mix can consist of an aggregate mixture with a very high proportion of broken grains and preferably polymer-modified bitumen as a binding agent. Such paving materials 6 with hard grains rub against attachment units 26 of road paver 1 that come into contact with the paving material (see FIG. 7, left-hand side: screw-nut connection, FIG. 7, center: screw connection, FIG. 7, right-hand side: bolt-nut connection) and cause wear on attachment units 26 so that attachment units 26 cannot be easily released with a tool such as a wrench.

The disclosure provides a wear protection 27 for attachment units 26 which shall be described in more detail with reference to FIGS. 8-15.

FIG. 7 shows an embodiment of an attachment unit 26 used at road paver 1.

Attachment unit 26 connects exchangeable component 30 of road paver 1 to chassis 8 or to a work assembly 31 of road paver 1. Work assembly 31 can be, for example, material storage 4, longitudinal conveyor device 5, screed 7, or transverse distributor assembly 10. Exchangeable components 30, in particular those against which paving material 6 flowing from material storage 4 to transverse distributor assembly 10 rubs, are, for example, widening parts 18, channel plates 16, pre-scrapers 17, and/or distributor augers 19, 19a, 19b.

The design principle of embodiments of wear protection 27 for attachment units 26 shall be described by way of example using wear protection 27 employed at transverse distributor assembly 10. Such wear protection 27 can also be employed for other attachment units 26 of road paver 1, in particular for attachment units 26 of road paver 1 that come into contact with paving material 6.

FIG. 8 shows a perspective illustration of part of transverse distributor assembly 10. As described above, transverse distributor assembly 10 comprises a shaft 21 (right-hand shaft 21a or left-hand shaft 21b) and a distributor auger 19 coupled in a releasable manner onto shaft 21 by way of two attachment units 26. Distributor auger 19 comprises a main body 33 mounted onto shaft 21 and an auger blade 34 extending from main body 33 and running around shaft 21. Distributer auger 19, in particular main body 33 of distributer auger 19, is attached to shaft 21 of transverse distributor assembly 10 by way of attachment units 26. In FIG. 8, attachment unit 26 is present in the form of a screw-nut connection. Attachment unit 26 comprises a screw 28 with a hexagonal screw head 28a and a screw nut 29 or cap nut 29a, respectively, attached to the other end of screw 28 (see the illustration on the left-hand side in FIG. 7).

In this embodiment, wear protection 27 is configured as a sacrificial body 32 for mounting onto attachment unit 26. In FIG. 8, sacrificial body 32 sits on screw nut 29 or on cap nut 29a, respectively, of attachment unit 26 and covers it completely. It is also possible that sacrificial body 32 does not completely cover screw nut 29 or cap nut 29a of attachment unit 26. On the oppositely disposed side, a further sacrificial body could be mounted onto screw head 28a. Accordingly, sacrificial body 32 prevents contact and thereby friction between attachment units 26 and paving material 6 flowing around attachment units 26 (or sacrificial body 32) in the region of screw nut 29 or cap nut 29a, respectively. Distributor auger 19 or auger blade 34, respectively, rotates in a direction of rotation 35 during operation of transverse distributor assembly 10. Relative to this, paving material 6 moves in a flow direction 36 substantially in the direction opposite to direction of rotation 35 of distributor auger 19.

FIG. 9 shows a schematic illustration of a single-piece embodiment of sacrificial body 32′. Sacrificial body 32′ is configured as a single-piece component 32a (single-piece sacrificial body 32′). Single-piece sacrificial body 32′ comprises a reception region 37 with an inner contour 38 which is configured to receive screw head 28a or screw nut 29 or cap nut 29a, respectively. Reception region 37 is provided as an opening of sacrificial body 32′. Single-piece sacrificial body 32′ can be arranged/attached in a force-fit manner on hexagonal screw nut 29 or cap nut 29a, respectively, or on hexagonal screw head 28a.

FIG. 10 shows a schematic illustration of a multi-part embodiment of sacrificial body 32″. Sacrificial body 32″ is configured as a multi-part or two-part construction device 32b (two-part sacrificial body 32″). Two-part sacrificial body 32″ comprises a reception region 37′ with an inner contour 38′ which is configured to receive screw head 28a or screw nut 29 or cap nut 29a, respectively. Reception region 37′ is provided as an opening of sacrificial body 32″. Two-part sacrificial body 32″ comprises two half-shells 40a, 40b. Once half-shells 40a, 40b have each been applied onto attachment unit 26, they can be attached to one another by way of screw connections 41a, 41b.

FIG. 11 shows a perspective illustration (partial view) of transverse distributor assembly 10.

In the embodiment shown in FIG. 11, wear protection 27 is configured in the form of a protective body 42 for attachment unit 26. Protective body 42 is arranged only on a first side 43 of attachment unit 26 facing conveyed paving material 6 and shields attachment unit 26 from the side so that it does not come into contact with paving material 6 or at least comes into contact only to a very small extent. A side (second side) 44 of attachment unit 26 arranged opposite side 43 facing conveyed paving material 6 is free, for example, from a further protective body 42. As a result, attachment unit 26 is freely accessible from the second side 44, for example, for a wrench, and can therefore be easily dismantled. FIG. 11 also shows that main body 33 comprises a recess 39 for receiving hexagonal screw head 28a of attachment unit 26, i.e., on the oppositely disposed side of cap nut 29a (see FIG. 13) which receives screw head 28a in a positive-fit manner so that it cannot rotate.

In FIG. 11, protective body 42 is configured as an integrally formed component of distributor auger 19 or of removable auger blade 34, respectively, for protecting cap nuts 29a of attachment units 26. FIG. 11 shows that distributor auger 19 is assembled from several segments A, B, i.e., several auger blades 34, that are mounted next to one another.

FIG. 12 shows a perspective illustration (partial view) of transverse distributor assembly 10 with the integrally formed protective body 42 for attachment unit 26. It can be seen there that protective body 42 comprises a ramp-shaped or arcuated protective section 45 inclined towards attachment unit 26. Protective body 42 or protective section 45, respectively, extends from main body 33 of segment A of distributor auger 19. Protective body 42 or protective section 45, respectively, is formed integrally with distributor auger 19. Protective body 42 extends over an entire height 46 of screw nut 29 or cap nut 29a, respectively. Protective section 45 is formed in the shape of a half-shell body 47. Relative flow direction 36 of paving material 6 and direction of rotation 35 of distributor auger 19 are indicated.

FIG. 13 shows a perspective illustration (partial view) of transverse distributor assembly 10 with protective body 42 for attachment unit 26. In this embodiment, protective section 45 does not extend over an entire height 46 of screw nut 29 or cap nut 29a, respectively. Protective section 45 comprises an inner side 48 and a distance 49 between inner side 48 of protective section 45 and attachment unit 26 varies along a length 50 of inner side 48. Direction of rotation 35 of distributor auger 19 is indicated. Protective body 42, in particular protective section 45, extends along a direction of curvature K that is opposite to direction of rotation 35 of auger blade 34.

FIG. 14 shows a schematic illustration (partial view) of transverse distributor assembly 10 with a different embodiment of protective body 42. Protective body 42 is attached to shaft 21 as a separate component and comprises a base part 51 that extends along a circumferential surface 52 of shaft 21. Protective section 45 of protective body 42 extends in an arcuate manner from base part 51 to an upper end 54 of cap nut 29a. Protective section 45 encloses a predetermined angle with base part 51.

Claims

1. A road paver for producing a pavement layer made of a paving material that is conveyable in a direction opposite to a paving direction of travel of the road paver from a material storage of the road paver to a transverse distributor assembly of the road paver and distributable by way of the transverse distributor assembly transverse to the paving direction of travel of the road paver and relative to a working width of a screed of the road paver, wherein the road paver comprises an exchangeable component arrangeable to come into contact with the paving material at least during operation of the road paver, an attachment unit for attachment of the exchangeable component to a work assembly or to a chassis of the road paver, and a wear protection for the attachment unit, wherein the wear protection comprises a sacrificial body for mounting onto the attachment unit and/or a protective body with a protective section which is formed to be ramp-shaped or curved at least in sections and configured to guide the paving material over the attachment unit.

2. The road paver according to claim 1, wherein the wear protection comprises the protective body, and the protective body is arranged only on a side of the attachment unit configured to face the conveyed paving material.

3. The road paver according to claim 1, wherein the attachment unit comprises a screw with a screw head and/or a screw nut attached to the screw.

4. The road paver according to claim 3, wherein the attachment unit comprises the screw nut configured as a hexagonal nut or a cap nut.

5. The road paver according to claim 3, wherein the wear protection comprises the sacrificial body, and the sacrificial body is configured such that the sacrificial body completely covers the screw head and/or the screw nut when the sacrificial body is mounted onto the attachment unit.

6. The road paver according to claim 1, wherein the wear protection is a single-piece component or a multi-piece construction device.

7. The road paver according to claim 1, wherein the wear protection comprises two half shells.

8. The road paver according to claim 1, wherein the wear protection comprises the sacrificial body, and the sacrificial body is attached onto the attachment unit in a force-fit and/or positive-fit manner.

9. The road paver according to claim 1, wherein the wear protection comprises the sacrificial body, and the sacrificial body is connected to the attachment unit in a positive-fit and/or positive substance-fit manner.

10. The road paver according to claim 1, wherein the wear protection comprises the protective body with the protective section, and the protective section is inclined towards the attachment unit.

11. The road paver according to claim 10, wherein the attachment unit comprises a screw with a screw head and/or a screw nut attached to the screw, and wherein the protective section extends over an entire height of the screw head and/or of the screw nut.

12. The road paver according to claim 1, wherein the wear protection comprises the protective body with the protective section, and the protective section is configured in a form of a shield comprising an inner side, and a distance between the inner side of the protective section and the attachment unit varies along a length of the inner side.

13. The road paver according to claim 1, wherein the wear protection comprises the protective body, and the protective body is configured as an integrally formed extension of the exchangeable component or is attached separately from the exchangeable component as a separate component to a portion of the road paver.

14. The road paver according to claim 1, wherein the transverse distributor assembly comprises a shaft and a distributor auger attached in a releasable manner onto the shaft by way of the attachment unit, wherein the distributor auger comprises a main body mounted onto the shaft and an auger blade extending from the main body and running around the shaft, and wherein the exchangeable component comprises the distributor auger.

15. The road paver according to claim 14, wherein the wear protection comprises the protective body with the protective section, and the protective section extends along a direction of curvature that is opposite to a direction of rotation of the auger blade.

16. The road paver according to claim 14, wherein the protective body is formed integrally with the distributor auger.

17. The road paver according to claim 14, wherein the protective body is formed separately from the distributor auger as a separate component.

18. The road paver according to claim 14, wherein the wear protection comprises the protective body with the protective section, and the protective body is attached to the shaft as a separate component, and the protective body comprises a base part that extends along a circumferential surface of the shaft, and the protective section encloses a predetermined angle with the base part.

19. The road paver according to claim 1, wherein the exchangeable component comprises a widening part of the screed for attachment to a screed base body of the screed by way of the attachment unit and/or comprises a pre-scraper for attachment to a screed base body of the screed by way of the attachment unit, and/or is a channel plate for attachment to the chassis by way of the attachment unit.

20. A road paver for producing a pavement layer made of a paving material, the road paver comprising: a screed;a transverse distributor assembly configured to distribute the paving material in a direction transverse to a paving direction of travel of the road paver and relative to a working width of the screed;an exchangeable component that is arrangeable to come into contact with the paving material at least during operation of the road paver;an attachment unit configured to attach the exchangeable component to a portion of the road paver; anda wear protection for the attachment unit, wherein the wear protection comprises a sacrificial body for mounting onto the attachment unit and/or a protective body with a protective section which is formed to be ramp-shaped or curved at least in a section to guide the paving material over the attachment unit.