Road finisher

Abstract

A road paver (1) for producing a paving layer (2) from a material hopper (4) of the road paver (1) conveyed in the opposite direction of paving (R) of the road paver (1) to a transverse distributor arrangement (10) of the road paver (1) and distributed by means of the transverse distributor arrangement (10) transversely to the paving direction (R) of the road paver (1) substantially over a working width (B) of a screed (7) of the road paver (1), wherein the road paver (1) has a replaceable component (30) that comes into contact with the paving material (6) at least during operation of the road paver (1) and at least one fastening unit (26) for fastening the replaceable component (30) to a working unit (31) or to a chassis (8) of the road paver (1), wherein a wear protection (27) for the fastening unit (26) is provided on the road paver (1),wherein the wear protection (27) comprises a sacrificial body (32) for placement on the fastening unit (26) and / or a protective body (42) with a protective section (42) that is at least partially ramp-shaped or curved and guides the installation material (6) over the fastening unit (26).

Description

[0001] The present invention relates to a road paver according to the preamble of claim 1.

[0002] Road pavers are designed to produce a paving layer from a paving material such as asphalt and typically comprise a chassis and work units mounted on the chassis, such as a material hopper, a paving screed, a conveyor system, and a cross-distribution system. Road pavers have replaceable components, each of which is detachably attached directly to the chassis and / or the work units by means of one or more bolted connections. These components are subject to wear and therefore need to be replaced at the end of their service life.

[0003] Bolted connections usually consist of a bolt with a bolt head and / or a bolt nut. The bolt head and / or the bolt nut usually have a drive, for example a hexagon profile or a hexagonal outer or inner profile, which can be driven with a wrench to loosen the bolt connection. The problem is that the abrasiveness of the asphalt or other paving materials such as gravel can cause the bolt heads and / or bolt nuts that come into contact with the asphalt to wear out over time. This causes material loss and shape loss on the surfaces of the bolt connections. The outer contours of the bolt connections or the bolt heads and / or bolt nuts lose their angular shape and become rounded, meaning they can no longer be gripped using commercially available tools (e.g. socket wrenches, ring wrenches, open-end wrenches, ratchets with nut attachment).This significantly complicates the replacement of components at the end of their service life. When the fasteners are so worn / abraded, the components must be laboriously removed from the working unit or chassis using an angle grinder.

[0004] DE 10 2022 102 095 A1 discloses an asphalt paver with a spreading auger for distributing asphalt in front of a paving screed. One or more auger segments are coupled to an auger shaft via several fastening elements (bolts with a bolt head and a nut). DE 10 2022 102 095 A1 further discloses that the auger segment has a U-shaped receptacle for the fastening elements. The side walls of the receptacle extend straight from the body and define a recess and a U-shaped recess, respectively. DE 10 2022 102 095 A1 discloses that the bolt heads and nuts of the fastening elements are countersunk into their respective recesses. According to DE 10 2022 102 095 A1, such an arrangement can prevent wear on the fasteners, since the side walls of the receptacles can provide abrasion protection (wear protection) for the fasteners against potentially abrasive road surface material or paving material.However, the fasteners are surrounded by side walls of the receptacles in such a way that access with a wrench is difficult. Even if the fastener could be loosened with a two-piece tool, such as a socket and a ratchet wrench, such two-piece tools are more difficult to use than a one-piece wrench. In addition, paving material can accumulate and harden within the recess, which makes replacing the auger segments even more difficult. Because the side walls of the U-shaped recess extend straight out from the body, the paving material accumulates on the walls of the recess when the auger rotates, leading to the accumulation and entrainment of asphalt in the recess.The asphalt that has accumulated in the recess must then be removed so that a changing tool can reach the fastener to loosen it, which significantly increases the effort required to change the auger segment.

[0005] The object of the present invention is to increase the service life of fastening units for connecting replaceable components on road pavers and to simplify the assembly / disassembly of the replaceable components. This object is achieved by the features of claim 1.

[0006] The invention relates to a road paver for producing a paving layer from paving material which is conveyed counter to a paving direction of travel of the road paver from a material hopper of the road paver to a transverse distribution arrangement of the road paver and distributed by means of the transverse distribution arrangement transversely to the paving direction of travel of the road paver essentially over a working width of a paving screed of the road paver, wherein the road paver has a replaceable component which comes into contact with the paving material at least during operation of the road paver and at least one fastening unit for fastening the replaceable component to a working unit or to a chassis of the road paver, wherein wear protection for the fastening unit is provided on the road paver.According to the invention, the wear protection comprises a sacrificial body for placement on the fastening unit and / or a protective body with a protective section that is at least partially ramp-shaped or curved and guides the installation material over the fastening unit. The fastening unit can have an outer contour, in particular an angular outer contour.

[0007] The invention advantageously allows for the complete prevention or reduction of any abrasive action between the fastening unit and the hot and abrasive paving material. This increases the service life of the fastening unit and protects its outer contour, allowing the fastening unit to be removed using a one-piece tool, such as a wrench, for example, and allows for the easy disassembly of replaceable components at the end of their service life or for the conversion of the road paver. This, in turn, enables simple and time-efficient replacement of the fastening unit.

[0008] Using a sacrificial body as an attachment on the fastening unit is particularly cost-effective and practical, as a sacrificial body can be easily mounted on at least part of the fastening unit. In particular, the sacrificial body can be placed in the form of a cap on the part of the fastening unit that can be grasped with a tool, for example, on a screw nut, in order to "sacrifice" itself for its preservation.

[0009] The ramp-shaped or curved protective section guides the paving material over the fastening unit, thus forming a guide to direct the paving material in one direction with reduced dragging effect, so that it is guided over the fastening unit and prevents wear. The ramp-shaped or curved protective section can even accelerate the paving material guided along it, allowing it to be channeled even more effectively past the fastening unit. In addition to its guiding function, the ramp-shaped or curved protective section can also act as a sacrificial body.

[0010] In contrast, compared to the protective section according to the invention, a recess formed for the fastening unit with parallel side walls creates a blocking effect because the paving material slows down on the newly erected side walls and can therefore accumulate there. The paving material slowed down and accumulated on the side walls can then easily reach the fastening unit. A protective effect against wear, as achieved by the invention, is therefore only possible to a limited extent with the known accommodation of a fastening unit within a recess. Rather, the known recess is used to secure the hexagon accommodated therein against twisting.

[0011] It would be conceivable for the fastening unit, in particular a screw head formed thereon, for example a hexagon, to be accommodated in a recess. This recess can be dimensioned such that the screw head accommodated therein, in particular the hexagon, cannot rotate when assembled. The recess can be an integral part of the working unit, for example a drive shaft. The recess is provided in particular as a form-fitting receptacle for the fastening unit on an opposite side of the wear protection assigned to the fastening unit. In addition to the positive effects of the wear protection described above, this also offers optimal locking of the replaceable component.

[0012] The protective body, in particular the protective section, can be arranged only on a side of the fastening unit facing the conveyed paving material. This side can be referred to as the first side of the fastening unit and forms the flank facing a material flow direction, on which flank the protective section is positioned in order to guide the paving material conveyed towards it over the fastening unit. Since the protective section is thus constructed as a protective shield in front of the fastening unit, i.e. extends only on this side of the fastening unit, a second side of the fastening unit opposite the first side is advantageously freely accessible for a changing tool, for example a wrench. This considerably simplifies the replacement of components because the fastening unit can be loosened using a one-piece tool, for example a wrench.

[0013] The fastening unit can comprise a screw with a screw head and / or a screw nut and / or a screw connection consisting of a screw and a screw nut, in particular a cap nut. The screw nut can be a hexagon nut or a cap nut. The screw nut can be attached to the screw or to a screw pin of the screw. The screw nut and / or the screw head can have a hexagonal profile. The screw can comprise a bolt with a thread.

[0014] In particular, the sacrificial body and / or the protective body is configured for attachment to a screw nut.

[0015] The fastening unit can be the replaceable component, for example a screw flight of the transverse distribution device, with a working unit, for example a drive shaft, or another replaceable component that can be detachably connected to the chassis of the road paver.

[0016] The sacrificial body can be designed such that it completely covers the screw head and / or the screw nut, in particular the cap nut, when the sacrificial body is placed on the fastening unit, for example, on the screw. This allows the fastening unit to be reliably protected from the grinding effect of the abrasive installation material, for example, from frictional wear and heat.

[0017] The sacrificial body can comprise one or more wear-resistant composite materials. This can extend the service life of the fastening unit.

[0018] The sacrificial body can be made of one or more wear-resistant composite materials. This can extend the service life of the fastening unit.

[0019] The sacrificial body can be made of a wear-resistant cast alloy or a wear-resistant cast alloy. This can extend the service life of the fastening 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).

[0020] The sacrificial body can be made of a plastic with high wear resistance and / or heat resistance. The operating temperature of the plastic can exceed 150°C. The operating temperature of the plastic can vary from 150°C to 300°C. The sacrificial body can be made of, for example, polyetheretherketone, polyphenylene sulfide, polyethyleneimine, or polytetrafluoroethylene.

[0021] The sacrificial body can be made of a steel with a hardness of at least 50 to 300 HBW, preferably 100 to 150 H BW.

[0022] The sacrificial body may have the effect of preventing contact between the fastening unit and the installation material, preferably until the sacrificial body is at least partially worn / abraded.

[0023] The sacrificial body may have a receiving area with an inner contour designed to receive the outer contour of the screw head and / or the screw nut.

[0024] In one embodiment, the wear protection, in particular the sacrificial body, can be a one-piece component. Advantageously, a one-piece component can be easier to handle and / or install. The one-piece component can be attached to the fastening unit without the need for an additional screw connection, for example, by pressing the component onto the fastening unit. Such a component can have approximately the shape of a cap nut, which can be slipped onto the screw nut, in particular the cap nut, of the fastening unit.

[0025] In an alternative embodiment, the wear protection, in particular the sacrificial body, can be a multi-part structural device. A multi-part structural device can be detachably attached to the wear protection, for example by means of a screw connection. This allows the wear protection to be advantageously removed from the fastening unit if the wear protection is not yet completely worn / abraded at the end of the service life of the replaceable component (when the component is to be replaced and the fastening unit is to be removed for this purpose). A multi-part structural device can have two shells or half-shells that are separate from one another or two shells or half-shells that are connected to one another so that they can rotate about a rotation axis. After the two components orOnce the two shells of the multi-part structural assembly are mounted on the fastening unit, the two components can be connected to each other and / or to the fastening unit using one or two screw connections. It would be conceivable for the wear protection on the fastening unit to be designed in the form of a detachably attached clamp.

[0026] The sacrificial body, regardless of whether it is a single-piece or multi-piece, can be attached to the fastening unit in a force-locking manner. This force-locking connection allows the protective unit to be firmly mounted on the fastening unit, or even completely prevents movement of the protective unit relative to the fastening unit. This, in turn, prevents friction between the sacrificial body and the fastening unit. A force-locking connection between the fastening unit and the sacrificial body can be detachable or permanent. A force-locking connection between the fastening unit and the sacrificial body can be achieved by screwing or by pressing the sacrificial body onto the edges of the screw head and / or the screw nut.A force-locking connection between the fastening unit and the sacrificial body can be achieved by elastic and / or plastic deformation of the sacrificial body, in particular at the edges of the screw head and / or the screw nut.

[0027] Alternatively, the sacrificial body can be positively attached to the fastening unit. The positive connection between the sacrificial body and the fastening unit can be detachable or non-detachable. The positive connection can be a snap / click connection. For the positive connection between the sacrificial body and the fastening unit, the inner contour of the sacrificial body and the outer contour of the fastening unit can each have a negative profile and a positive profile. The negative profile and the positive profile can interlock in such a way that movement of the sacrificial body relative to the fastening unit is prevented.

[0028] Alternatively, the sacrificial body can be firmly bonded to the fastening unit. The bond can be a welded, soldered, or adhesive joint.

[0029] The sacrificial body can in particular be a cast part.

[0030] The sacrificial body can be cut out of a sheet of metal.

[0031] The protective body, in particular its protective section, can be inclined toward the fastening unit. If the protective section is inclined toward the fastening unit, an inner surface of the protective section and the outer walls of the screw nut are not parallel to each other. If the protective body or the protective section is formed inclined toward the fastening unit, an imaginary angle between an inner surface of the protective body or the protective section and the outer walls of the screw nut is less than 90 degrees. The protective section can extend over the entire height of the screw head and / or the screw nut.

[0032] The protective section can be inclined towards the fastening unit in such a way that contact between the fastening unit and the installation material, in particular in a relative flow direction of the installation material, is prevented, or at least no sliding contact occurs which leads to wear of the fastening unit.

[0033] The protective section may essentially have the shape of a half-shell. A thickness / width of the half-shell may be the same along a length or a thickness.

[0034] The protective section may have an inner and an outer side. The distance between the inner side of the protective section and the fastening unit may vary along the inner side.

[0035] On the inner side of the half-shell there may be a recess to accommodate the entire screw head and / or the entire screw nut.

[0036] The protective section can essentially be designed in the form of a shield.

[0037] The protective section may have an upper end and a lower end. A first distance between the upper end of the protective section and the fastening unit may be smaller than a second distance between the lower end of the protective section and the fastening unit.

[0038] The protective section may extend radially from the lower end of the protective section to the upper end of the protective section.

[0039] The lower end of the protective section may be connected to an outer surface of a working unit.

[0040] In one embodiment, the protective body can be designed as an extension of the component. This avoids additional work when mounting the protective body on the road paver or on a working unit of the road paver.

[0041] In an alternative embodiment, the protective body can be attached to the road paver separately from the component, i.e., as a separate component, preferably to a working unit, in particular to a rotating working unit, or to the chassis of the road paver. It is advantageous here that the protective body can be mounted / dismounted or replaced separately from the component.

[0042] The protective body, in particular the upper end of the protective section, can extend to an upper end of the fastening unit, in particular the screw head or the screw nut. The protective body, in particular the upper end of the protective section, can extend beyond the fastening unit, in particular the screw head or the screw nut.

[0043] The protective body can be made of a steel with a hardness of at least 50 to 300 HBW, preferably 100 to 150 H BW.

[0044] The protective body can be made of one or more wear-resistant composite materials. This can extend the service life of the fastening unit.

[0045] The protective body can be made of one or more wear-resistant composite materials. This can extend the service life of the fastening unit.

[0046] The protective body can be made of a wear-resistant cast alloy or a wear-resistant cast alloy. This can extend the service life of the fastening 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).

[0047] Along a conveyor line for paving material in the conveying direction, paving material can be conveyed past several fastening units, for example, from the material hopper through a material tunnel in a tractor unit of the road paver to the paving screed. A sacrificial body can be placed on all or some of the fastening units. A protective body can be arranged next to all or some of the fastening units.

[0048] It would be possible to provide one protective body for each or for two adjacent fastening units.

[0049] The transverse distributor assembly may include a shaft. The transverse distributor assembly may include a distributor auger detachably coupled to the shaft by means of the fastening unit. The distributor auger may include a main body mounted on the shaft. The distributor auger may include a helical auger blade extending from the main body and extending around the shaft. The distributor auger, and at least some segments thereof that come into contact with paving material, may be replaceable components of the road paver, in particular of the transverse distributor assembly of the road paver.

[0050] The fastening unit can extend perpendicular to a rotation axis of the shaft.

[0051] The protective body can extend along a curvature opposite to the direction of rotation of the screw flight. This allows the protective body to extend in the relative flow direction of the paving material conveyed by the rotation of the screw flight. This, in turn, can reduce the abrasive forces acting on the protective body caused by the conveyed paving material and protect the protective body itself against wear.

[0052] The protective body can be formed integrally with the auger, particularly with the main body, particularly as a single cast part. This avoids the effort required for additional assembly of the protective body to the cross-distributor assembly.

[0053] Alternatively, the protective body can be designed as a separate component from the auger. This allows the protective body to be replaced independently of the auger. This also makes the auger more cost-effective to manufacture.

[0054] The protective body can surround at least part of the shaft. In other words, the protective body can extend radially around a portion of the shaft or run around a portion of the shaft. Thus, the protective body provides wear protection not only for the fastening unit but also for the shaft.

[0055] The protective body can be attached to the shaft. Preferably, a base portion of the protective body extends along a circumferential surface of the shaft. The protective section is preferably arranged at a predetermined angle to the base portion.

[0056] The material hopper, a conveying device of the road paver for conveying the paving material from the material hopper to the transverse distribution arrangement, the transverse distribution arrangement, or the screed can each be a working unit of the road paver. The replaceable component can be a widening part of the paving screed for attachment to a screed base body of the paving screed. The replaceable component can be a pre-scraper for attachment to a screed base body of the paving screed. The replaceable component can be a channel plate for attachment to the chassis. As explained above, the replaceable component can in particular be the auger of the transverse distribution arrangement.

[0057] The wear protection according to the invention can generally be used for attachment to those fastening units of the road paver which are used for the detachable fastening of a component and which can come into contact with the component during operation of the road paver due to the material movement caused thereon.

[0058] The invention is explained in more detail using exemplary embodiments according to the following figures. They show: Figure 1 shows a side view of a road finisher for producing a paving layer, Figure 2 shows a perspective view of the road finisher with a paving screed, Figure 3 shows a top view of the paving screed with laterally retracted extension parts, Figure 4 shows the paving screed from Figure 3with laterally extended extension parts, Figure 5 the paving screed with extended extension parts and widening parts attached to the sides for producing a desired working width, Figure 6 a perspective view of a transverse distributor arrangement of the road paver, Figure 7 a schematic view of embodiments of the fastening unit, Figure 8 a perspective view (partial view) of the transverse distributor arrangement with a protective unit in the form of a sacrificial body for the fastening unit, Figure 9 a schematic view of a one-piece embodiment of the sacrificial body, Figure 10 a schematic view of a multi-part embodiment of the sacrificial body, Figure 11 a perspective view (partial view) of the transverse distributor arrangement with wear protection in the form of a protective body for the fastening unit, Figure 12 a perspective view (partial view) of the transverse distributor arrangement with an integral protective body,Figure 13 is a schematic representation (partial view) of the cross-distributor arrangement with the integral protective body, and Figure 14 is a perspective representation (partial view) of the cross-distributor arrangement with a separately formed protective body.

[0059] Figure 1 shows a road paver 1 for producing a paving layer 2 on a subsurface 3. The road paver 1 has a material hopper 4 at the front in the paving direction R, from which a paving material 6 held therein is transported to a paving screed 7 of the road paver 1 by means of a longitudinal conveyor device 5, counter to the paving direction R of the road paver 1. The longitudinal conveyor device 5 is arranged within a chassis 8 of the road paver 1 and has a scraper belt 9 (see Figure 4). The scraper belt 9 comprises a left scraper belt section 9a and a right scraper belt section 9b. From the scraper belt 9 of the longitudinal conveyor device 5, the paving material 6 is transferred to a transverse distribution arrangement 10, which is positioned in front of the paving screed 7. The transverse distribution arrangement 10 is designed to distribute the paving material 6 in front of the paving screed 7 transversely to the paving direction of travel R.

[0060] Figure 2 shows the road paver 1 in perspective. The paving screed 7 has a screed base body 11 and laterally extendable extension parts 12 for setting a desired working width B of the paving layer 2. By widening the paving screed 7 in this way, a larger working width B can be achieved for the newly paved layer 2.

[0061] Figure 3shows a schematic representation of a plan view of the paving screed 7 of the road paver 1. The paving material 6, which is discharged by the scraper belt 9 in front of the screed base body 11 of the paving screed 7, as shown by arrows P, is distributed by the transverse distribution arrangement 10 along a front side 13 of the screed base body 11. A rear wall 14 of the chassis 8 of the road paver 1, together with the front side 13 of the screed base body 11, forms a transverse distribution channel 15 for the transverse distribution arrangement 10. This transverse distribution channel 15 can be further expanded laterally in accordance with a widening of the paving screed 7. This shows the Figure 4 .

[0062] Figure 4 shows the paving screed 7 in a schematic plan view with extended extension parts 12. By widening the paving screed 7 in this way, a larger working width B can be created for the newly created paving layer 2. Figure 4shows that the cross-distribution channel 15 is extended laterally beyond the screed base body 11. Along the widened cross-distribution channel 15, the paving material 6 thrown by the scraper belt 9 can be transported to the outer sides of the extension parts 12. The Figure 4 arranged cross-distribution arrangement 10 is also extended.

[0063] The transverse distribution channel 15, located in front of the paving screed 7, is formed at its outer edges transversely to the paving direction R by channel plates 16 supported on the chassis 8 of the road paver 1 and by pre-scrapers 17 attached to the sides of the screed base body 11. Depending on the set working width B, the channel plates 16 and the pre-scraper 17 can be further extended laterally to extend the transverse distribution channel 15. The same applies analogously to the transverse distribution arrangement 10.

[0064] Figure 5shows the paving screed 7 with extended extension parts 12 and widening parts 18 attached to the sides to create a very large working width B for the paving layer 2. Figure 5 shows that the transverse distribution channel 15 is formed along the screed base body 11, the extension parts 12 and along the widening parts (attachments) 18 attached thereto, transversely to the paving direction of travel R. Depending on the working width B, additional channel plates 16 and pre-scrapers 17 were mounted to further expand the transverse distribution channel 15.

[0065] Figure 6shows a perspective view of an embodiment of the transverse distributor assembly 10. This transverse distributor assembly 10 is attached to the rear end of the chassis 8 of a road paver 1. The transverse distributor assembly 10 comprises a distributor auger 19, or a right distributor auger 19a and a left distributor auger 19b (in the paving direction of travel of the road paver 1). Both distributor augers 19a, 19b are centrally mounted on a screw suspension 20. Located in the housing formed by the screw suspension 20 is a screw drive (not shown) for driving the two distributor augers 19a, 19b. The transverse distribution arrangement 10 comprises a shaft 21. This can be two individual shafts 21 (right shaft 21a, left shaft 21b) or a common shaft 21 of the two distribution augers 19a, 19b. The right distribution auger 19a is releasably coupled to the shaft 21a. The left distribution auger 19b is releasably coupled to the shaft 21b.

[0066] The outer end of each shaft 21a, 21b, i.e., the end facing away from the auger suspension 20, is mounted in a auger bearing 22a, 22b. Each auger bearing 22a, 22b is mounted at the lower end of a auger bearing bracket 23a, 23b. These auger bearing brackets 23 have a substantially vertically oriented tube 24a, 24b, which is attached to the chassis 8 of the road paver 1 by means of a mounting plate 25.

[0067] The paving material 6 may comprise a cohesive mix, such as asphalt, and / or unbound mix, such as gravel. The asphalt mix may consist of an aggregate mixture with a very high proportion of crushed grains and preferably polymer-modified bitumen as a binder. Such paving materials 6 with hard grains rub against the fastening units 26 of the road paver 1 that come into contact with the paving material (see Figure 7 , left: screw-nut connection, Figure 7 , Middle: screw connection, Figure 7 , right: bolt-nut connection) and cause wear on the fastening units 26, so that the fastening units 26 cannot be easily loosened with a tool such as a wrench.

[0068] The invention provides a wear protection 27 for the fastening units 26, which is determined by the Figure 8 - 15 is described in more detail.

[0069] Figure 7 shows an embodiment of a fastening unit 26 used on the road paver 1.

[0070] The fastening unit 26 connects the replaceable component 30 of the road paver 1 to the chassis 8 or to a working unit 31 of the road paver 1. The working unit 31 can be, for example, the material hopper 4, the longitudinal conveyor device 5, the paving screed 7, or the transverse distributor arrangement 10. Replaceable components 30, in particular those against which the paving material 6 flowing from the material hopper 4 to the transverse distributor arrangement 10 rubs, are, for example, the widening parts 18, the channel plates 16, the pre-scrapers 17, and / or the distribution augers 19, 19a, 19b.

[0071] The design principle of embodiments of the wear protection 27 for the fastening units 26 is described using the wear protection 27 used on the transverse distributor arrangement 10 as an example. Such wear protection 27 can also be used for other fastening units 26 of the road paver 1, in particular for the fastening units 26 of the road paver 1 that come into contact with the paving material 6.

[0072] Figure 8shows a perspective view of a portion of the transverse distributor assembly 10. As described above, the transverse distributor assembly 10 comprises a shaft 21 (right shaft 21a or left shaft 21b) and a distributor screw 19 detachably coupled to the shaft 21 by means of two fastening units 26. The distributor screw 19 has a main body 33 mounted on the shaft 21 and a screw blade 34 extending from the main body 33 and extending around the shaft 21. The distributor screw 19, in particular the main body 33 of the distributor screw 19, is fastened to the shaft 21 of the transverse distributor assembly 10 by means of the fastening units 26. In Figure 8 The fastening unit 26 is a screw-nut connection. The fastening unit 26 comprises a screw 28 with a hexagonal screw head 28a and a screw nut 29 or cap nut 29a attached to the other end of the screw 28 (see the left figure in the Figure 7 ).

[0073] In this embodiment, the wear protection 27 is designed as a sacrificial body 32 for placement on the fastening unit 26. The sacrificial body 32 is located in Figure 8on the screw nut 29 or on the cap nut 29a of the fastening unit 26 and covers them completely. It is also possible that the sacrificial body 32 does not completely cover the screw nut 29 or the cap nut 29a of the fastening unit 26. On the opposite side, another sacrificial body could be placed on the screw head 28a. Accordingly, the sacrificial body 32 prevents contact and thus friction between the fastening units 26 and the paving material 6 flowing around the fastening units 26 (or the sacrificial body 32) in the area of ​​the screw nut 29 or the cap nut 29a. The distribution screw 19 or the screw blade 34 rotates in a direction of rotation 35 during operation of the transverse distributor arrangement 10. Relative to this, the paving material 6 moves in a flow direction 36 essentially opposite to the direction of rotation 35 of the distribution screw 19.

[0074] Figure 9shows a schematic representation of a one-piece embodiment of the sacrificial body 32`. The sacrificial body 32` is designed as a one-piece component 32a (one-piece sacrificial body 32`). The one-piece sacrificial body 32` has a receiving area 37 with an inner contour 38, which is designed to receive the screw head 28a or the screw nut 29 or the cap nut 29a. The receiving area 37 is provided as an opening in the sacrificial body 32`. The one-piece sacrificial body 32` can be arranged / fastened in a form-fitting manner on the hexagonal screw nut 29 or cap nut 29a, or on the hexagonal screw head 28a.

[0075] Figure 10shows a schematic representation of a multi-part embodiment of the sacrificial body 32". The sacrificial body 32" is designed as a multi-part or two-part structural device 32b (two-part sacrificial body 32"). The two-part sacrificial body 32" has a receiving area 37' with an inner contour 38', which is designed to receive the screw head 28a or the screw nut 29 or the cap nut 29a. The receiving area 37' is provided as an opening in the sacrificial body 32". The two-part sacrificial body 32" has two half-shells 40a, 40b. After the half-shells 40a, 40b are each applied to the fastening unit 26, they can be fastened to one another by means of screw connections 41a, 41b.

[0076] Figure 11 shows a perspective view (partial view) of the cross distributor arrangement 10.

[0077] In the Figure 11In the embodiment shown, the wear protection 27 is designed in the form of a protective body 42 for the fastening unit 26. The protective body 42 is arranged only on a first side 43 of the fastening unit 26 facing the conveyed paving material 6 and shields the fastening unit 26 laterally, so that it does not come into contact with the paving material 6, or at least only very little. A side 44 of the fastening unit 26 arranged opposite the side 43 facing the conveyed paving material 6 (second side) is free, for example, from another protective body 42. As a result, the fastening unit 26 is freely accessible from the second side 44, for example for a wrench, and is therefore easy to disassemble. Further, Figure 11 that the main body 33 is designed to receive the hexagonal screw head 28a of the fastening unit 26, i.e. on the opposite side of the cap nut 29a (see Figure 13), has a recess 39 which positively receives the screw head 28a so that it cannot twist.

[0078] In Figure 11 the protective body 42 is designed as an integral component of the distribution screw 19 or the removable screw blade 34 in order to protect the cap nuts 29a of the fastening units 26. Figure 11 shows that the distribution screw 19 is assembled from several segments A, B mounted next to each other, ie several screw wings 34.

[0079] Figure 12shows a perspective view (partial view) of the transverse distributor arrangement 10 with the integral protective body 42 for the fastening unit 26. Here it can be seen that the protective body 42 has a ramp-shaped or curved protective section 45 inclined towards the fastening unit 26. The protective body 42 or the protective section 45 extends from the main body 33 of segment A of the distributor screw 19. The protective body 42 or the protective section 45 is formed integrally with the distributor screw 19. The protective section 42 extends over an entire height 46 of the screw nut 29 or the cap nut 29a. The protective section 45 is designed in the form of a half-shell body 47. The relative flow direction 36 of the paving material 6 and the direction of rotation 35 of the distributor screw 19 are indicated.

[0080] Figure 13shows a schematic representation (partial view) of the transverse distributor arrangement 10 with the protective body 42 for the fastening unit 26. In this embodiment, the protective section 45 does not extend over the entire height 46 of the screw nut 29 or cap nut 29a. The protective section 45 has an inner side 48, and a distance 49 between the inner side 48 of the protective section 45 and the fastening unit 26 varies along a length 50 of the inner side 48. The direction of rotation 35 of the distributor screw 19 is indicated. The protective body 42, in particular the protective section 45, extends along a direction of curvature K opposite the direction of rotation 35 of the screw blade 34.

[0081] Figure 14shows a schematic representation (partial view) of the transverse distributor arrangement 10 with another embodiment of the protective body 42. The protective body 42 is attached to the shaft 21 as a separate component and has a base part 51 that extends along a circumferential surface 52 of the shaft 21. The protective section 45 of the protective body 42 extends in an arc from the base part 51 toward an upper end 54 of the cap nut 29a. The protective section 45 forms a predetermined angle with the base part 51.

Claims

1. Road paver (1) for producing a paving layer (2) from paving material (6) conveyed counter to a paving direction of travel (R) of the road paver (1) from a material hopper (4) of the road paver (1) to a transverse distribution arrangement (10) of the road paver (1) and distributed by means of the transverse distribution arrangement (10) transversely to the paving direction of travel (R) of the road paver (1) essentially over a working width (B) of a paving screed (7) of the road paver (1), wherein the road paver (1) has a replaceable component (30) which comes into contact with the paving material (6) at least during operation of the road paver (1) and at least one fastening unit (26) for fastening the replaceable component (30) to a working unit (31) or to a chassis (8) of the road paver (1), wherein a wear protection (27) for the fastening unit (26) is provided on the road paver (1). is intended, characterized in thatthe wear protection (27) has a sacrificial body (32) for placement on the fastening unit (26) and / or a protective body (42) with a protective section (45) which is at least partially ramp-shaped or curved and guides the installation material (6) over the fastening unit (26).

2. Road construction machine according to claim 1, characterized in that the protective body (42) is arranged only on a side (43) of the fastening unit (26) facing the conveyed installation material (6).

3. Road construction machine according to claim 1 or 2, characterized in that the fastening unit (26) comprises a screw (28) with a screw head (28a) and / or a screw nut (29) fastened to the screw (28), in particular a hexagon nut (29b) or a cap nut (29a).

4. Road construction machine according to claim 3, characterized in thatthe sacrificial body (32) is designed such that the sacrificial body (32) completely covers the screw head (28a) and / or the screw nut (29), in particular a cap nut (29a), when the sacrificial body (32) is placed on the fastening unit (26).

5. Road construction machine according to one of claims 1 to 4, characterized in that the wear protection (27), in particular the sacrificial body (32), is a one-piece component (32a) or a multi-piece structural device (32b), preferably comprising two half-shells (40a, 40b).

6. Road construction machine according to one of the preceding claims, characterized in that the sacrificial body (32) is fastened to the fastening unit (26), in particular to a cap nut (29a) of the fastening unit (26), in a force-fitting and / or form-fitting manner.

7. Road construction machine according to one of the preceding claims, characterized in that the sacrificial body (32) is positively and / or materially connected to the fastening unit (26).

8. Road construction machine according to one of the preceding claims, characterized in that the protective section (45) is inclined towards the fastening unit (26) and preferably extends over an entire height (46) of the screw head (28a) and / or the screw nut (29), in particular the cap nut (29a).

9. Road construction machine according to one of the preceding claims, characterized in that the protective section (45) is designed substantially in the form of a shield, and preferably has an inner side (48) and a distance (49) between the inner side (48) of the protective section (45) and the fastening unit (26) varies along a length (50) of the inner side (48).

10. Road construction machine according to one of the preceding claims, characterized in thatthe protective body (42) is designed as an integral extension of the replaceable component (30) or is fastened separately from the replaceable component (30) as a separate component to the road finisher (1), preferably to a working unit (31) of the road finisher (1).

11. Road construction machine according to one of the preceding claims, characterized in that the transverse distributor arrangement (10) has a shaft (21) and at least one distributor auger (19) detachably fastened to the shaft (21) by means of the fastening unit (26), wherein the distributor auger (19) has a main body (33) placed on the shaft (21) and a screw blade (34) extending from the main body (33) and running around the shaft (21), wherein the distributor auger (19) is a replaceable component (30) of the road finisher (1), in particular of the transverse distributor arrangement (10) of the road finisher (1).

12. Road construction machine according to claim 11, characterized in thatthe protective body (42), in particular the protective section (45) extends along a direction of curvature (K) opposite to the direction of rotation (35) of the screw blade (34).

13. Road construction machine according to claim 11 or 12, characterized in that the protective body (42) is formed in one piece with the distribution screw (19), in particular with the main body (33), or is formed separately from the distribution screw (19) as a separate component.

14. Road construction machine according to one of claims 11 to 13, characterized in that the protective body (42) is fastened to the shaft (21) as a separate component, and preferably a base part (51) of the protective body (42) extends along a circumferential surface (52) of the shaft (21) and the protective section (45) encloses a predetermined angle with the base part (51).

15. Road construction machine according to one of the preceding claims, characterized in thatthe replaceable component (30) is a widening part (18) of the screed (7) for fastening to a screed base body (11) of the screed (7) by means of the fastening unit (26) and / or a pre-scraper (17) for fastening to a screed base body (11) of the screed (7) by means of the fastening unit (26), and / or a channel plate (16) for fastening to the chassis (8) by means of the fastening unit (26).

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