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.
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; 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 a section to guide the paving material over the attachment unit.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0059] The disclosure shall be explained in more detail according to the following figures by use of embodiments, where:
[0060] FIG. 1 shows a side view of a road paver for producing a pavement layer;
[0061] FIG. 2 shows a perspective illustration of the road paver with a screed;
[0062] FIG. 3 shows a top view of the screed with laterally retracted extension members;
[0063] FIG. 4 shows the screed from FIG. 3 with laterally extended extension members;
[0064] 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;
[0065] FIG. 6 shows a perspective illustration of a transverse distributor assembly of the road paver;
[0066] FIG. 7 shows schematic illustration of embodiments of the attachment unit;
[0067] 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;
[0068] FIG. 9 shows a schematic illustration of a single-piece embodiment of the sacrificial body;
[0069] FIG. 10 shows a schematic illustration of a multi-piece embodiment of the sacrificial body;
[0070] 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;
[0071] FIG. 12 shows a perspective illustration (partial view) of the transverse distributor assembly with an integrally formed protective body;
[0072] FIG. 13 shows a schematic illustration (partial view) of the transverse distributor assembly with the integrally formed protective body; and
[0073] FIG. 14 shows a perspective illustration (partial view) of the transverse distributor assembly with a separately formed protective body.
DETAILED DESCRIPTION
[0074] 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.
[0075] 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.
[0076] 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.
[0077] 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.
[0078] 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.
[0079] 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.
[0080] 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.
[0081] 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.
[0082] 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.
[0083] The disclosure provides a wear protection 27 for attachment units 26 which shall be described in more detail with reference to FIGS. 8-15.
[0084] FIG. 7 shows an embodiment of an attachment unit 26 used at road paver 1.
[0085] 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.
[0086] 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.
[0087] 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).
[0088] 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.
[0089] 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.
[0090] 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.
[0091] FIG. 11 shows a perspective illustration (partial view) of transverse distributor assembly 10.
[0092] 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.
[0093] 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.
[0094] 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.
[0095] 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.
[0096] 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.
