Road paver

Abstract

The invention relates to a road paver (1) for producing a paving layer (2) from a paving material (6) which is conveyed from a material silo (4) of the road paver (1) against a paving direction (R) of travel of the road paver (1) to a transverse distributor device (10) of the road paver (1), the paving material (6) is substantially distributed over a working width (B) of a paving screed (7) of the road paver (1) by means of a transverse distributor device (10) which is transverse to the paving travel direction (R) of the road paver (1), the invention relates to a road paver (1) having an exchangeable part (30) which is in contact with a paving material (6) at least during operation of the road paver (1) and at least one fastening unit (26) for fastening the exchangeable part (30) to a working unit (31) or a chassis (8) of the road paver (1), a wear protection device (27) for the fastening unit (26) being provided on the road paver (1), the wear protection device (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 in a ramp-shaped or curved shape and guides the paving material (6) away from the fastening unit (26).

Description

Technical Field

[0001] The invention relates to a road paver. Background Art

[0002] A road paver is provided for producing a paving layer from a paving material such as asphalt and generally comprises a chassis and a working unit arranged on the chassis, such as a material silo, a paving screed, a conveying device, a transverse distributor device. The road paver has replaceable components, each of which is releasably fastened directly to the chassis and / or the working unit by means of one or more screw connections, which replaceable components are subject to wear and therefore need to be replaced at the end of their service life.

[0003] Screw connections usually include a screw with a screw head and / or a nut. The screw head and / or the nut usually have a drive portion, such as a hexagonal profile or a hexagonal external or internal profile, which can be driven with a wrench to loosen the screw connection. The problem is that the abrasiveness of asphalt or other paving materials (such as gravel) can cause the screw head and / or nut in contact with the asphalt to wear over time. This can lead to a loss of material and shape on the surface of the screw connection. The outer contour of the screw connection or the screw head and / or the nut loses its angular shape and becomes rounded, so that it can no longer be clamped with the help of standard tools (such as socket wrenches, ring wrenches, open-end wrenches, ratchet wrenches with nut attachments). This makes it more difficult to replace the component at the end of its service life. If the fastening element is so worn / abraded, the component must be separated from the working unit or chassis in a complicated way using an angle grinder.

[0004] From DE 10 2022 102 095 A1, an asphalt road paver with a distributor screw for distributing asphalt in front of a paving screed is known. One or more screw segments are coupled to the screw shaft via a plurality of fastening elements (bolts with bolt heads and nuts). DE 10 2022 102 095 A1 also discloses that the screw segment has a U-shaped receptacle for the fastening element. The side walls of the receptacle extend straight from the body and define a groove or a U-shaped groove. DE 10 2022 102 095 A1 discloses that the bolt head and the nut of the fastening element enter into their respective grooves. According to DE 10 2022 102 095 A1, such an arrangement can prevent wear on the fastening element, because the side walls of the receptacle can provide the fastening element with abrasion protection (wear protection) from the potentially abrasive road material or paving material. However, the fastening element is surrounded by the side walls of the receptacle, making it difficult for a wrench tool to access. Even if a two-piece tool such as a nut and a socket wrench can be used to loosen the fastening element, such a two-piece tool is more difficult to use than a one-piece wrench. In addition, paving material can accumulate in the groove and harden therein, which further complicates the replacement of the screw segment. Since the side walls of the U-shaped groove extend straight from the body here, paving material accumulates on the walls of the groove when the screw rotates, resulting in the accumulation and entrainment of asphalt in the groove. The asphalt accumulated in the groove must then first be removed so that the replacement tool can reach the fastening element to loosen it, which significantly increases the workload of replacing the screw segment. Summary of the invention

[0005] The object of the present invention is to increase the service life of a fastening unit for connecting replaceable components on a road paver and to simplify the assembly / disassembly of the replaceable components.

[0006] The invention relates to a road paver for producing a paving layer with paving material, the paving material being conveyed from a material silo of the road paver to a transverse distributor device of the road paver counter to the paving travel direction of the road paver, and the paving material being distributed substantially over the working width of a paving screed of the road paver by means of the transverse distributor device transverse to the paving travel direction 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 chassis of the road paver, wherein a wear protection device for the fastening unit is provided on the road paver. According to the invention, the wear protection device has a sacrificial body for being placed on the fastening unit. And / or a protective body with a protective section which is at least partially ramp-shaped or curved and guides the paving material away from the fastening unit. The fastening unit can have an outer contour, in particular an angular outer contour.

[0007] The invention advantageously makes it possible to completely prevent or reduce grinding effects 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, so that the fastening unit can be loosened, for example, with the aid of a one-piece tool such as a wrench, and the replaceable part can be disassembled or replaced on the road paver without any problems at the end of its service life. This in turn makes it possible to easily and quickly replace the fastening unit.

[0008] The use of a sacrificial body as an attachment to the fastening unit is particularly cost-effective and practical, since the sacrificial body can be easily mounted on at least a portion of the fastening unit. In particular, the sacrificial body can be placed in the form of a cap on a portion of the fastening unit that can be gripped by means of a tool, for example on a nut, in order to "sacrifice" itself to protect it.

[0009] The ramp-shaped or curved protection segment guides the paving material away from the fastening unit, thereby forming a guide device to guide the paving material in a direction with reduced abrasive action, so that the paving material is guided on the fastening unit to prevent it from being worn. In this case, the ramp-shaped or curved protection segment can even accelerate the paving material guided along it, making it easier to pass through the fastening unit. In addition to its guiding function, the ramp-shaped or curved protection segment can also act as a sacrificial body.

[0010] On the other hand, the grooves formed for the fastening units with parallel side walls cause a blocking effect compared to the protective segment according to the invention, since the paving material slows down on the vertically erected side walls and can therefore accumulate thereon. The accumulated paving material slowed down at the side walls can then easily reach the fastening units. Therefore, due to the known accommodation of the fastening units in the grooves, the anti-wear protection effect achieved by the invention can only be achieved to a limited extent. On the contrary, the known grooves serve to fix the hexagons (Sechskant) accommodated therein to prevent twisting.

[0011] It is conceivable that the fastening unit, in particular a screw head (for example hexagonal) formed thereon, is accommodated in a recess. The recess can be dimensioned such that a screw head (in particular a hexagonal screw head) accommodated therein cannot rotate in the assembled state. The recess can be a one-piece component of the working unit (for example a drive shaft). The recess serves in particular as a form-fitting receptacle for the fastening unit on the opposite side of the wear protection device assigned to the fastening unit. In addition to the above-mentioned positive effects due to the wear protection device, this also provides an optimal locking of the replaceable component.

[0012] The protective body, in particular the protective segment, can only be arranged on the 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 a flank facing the material flow direction, on which the protective segment is positioned in order to guide the paving material conveyed towards it away from the fastening unit. Since the protective segment stands as a protective cover in front of the fastening unit, i.e., extends only on this side of the fastening unit, the second side of the fastening unit, which is opposite to the first side, is advantageously freely accessible to a replacement tool, such as a wrench. This significantly simplifies the replacement of components, since the fastening unit can be loosened with a one-piece tool, such as a wrench.

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

[0014] In particular, the sacrificial body and / or the protective body are configured to be attached to the nut.

[0015] The fastening unit may be a replaceable component, such as a screw blade of a transverse distributor device with a working assembly, such as a drive shaft, or another replaceable component which can be detachably connected to the chassis of the road paver.

[0016] The sacrificial body can be designed such that when the sacrificial body is placed on the fastening unit (e.g. on a screw), the sacrificial body completely covers the screw head and / or the nut (in particular the cap nut). The fastening unit can thereby be reliably protected from the grinding effects of the abrasive paving material, for example from frictional wear and heat.

[0017] The sacrificial body can comprise one or more wear-resistant composite materials, thereby making it possible to extend the service life of the fastening unit.

[0018] The sacrificial body can be composed of one or more wear-resistant composite materials, thereby extending the service life of the fastening unit.

[0019] The sacrificial body can include or consist of 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 working temperature of the plastic can exceed 150° C. The working temperature range of the plastic is 150° C. to 300° C. The sacrificial body can be made of polyetheretherketone, polyphenylene sulfide, polyethyleneimine, polytetrafluoroethylene, for example.

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

[0022] The sacrificial body may serve to prevent contact between the fastening unit and the paving material, preferably until the sacrificial body is at least partially worn away / abraded away.

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

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

[0025] In an alternative embodiment, the wear protection device, in particular the sacrificial body, can be a multi-piece construction device. The multi-piece construction device can be detachably attached to the wear protection device, for example by means of a screw connection. Thus, if the wear protection device has not been 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 should be loosened for this purpose), the wear protection device can be removed from the fastening unit in an advantageous manner. The multi-piece construction device can have two shells or half shells that are separated from each other or two shells that are rotatably connected to each other around an axis of rotation. After the two parts or two shells of the multi-piece construction device have been attached to the fastening unit, the two parts can be connected to each other and / or to the fastening unit by means of one or two screw connections. It is conceivable that the wear protection device can be formed on the fastening unit in the form of a clamp that is detachably attached to the fastening unit.

[0026] The sacrificial body can be attached to the fastening unit in a force-fitting manner, whether it is one-piece or multi-piece. Due to the force-fitting connection, the protection unit can be firmly mounted on the fastening unit, or even completely prevented from moving the protection unit relative to the fastening unit. This in turn prevents friction between the sacrificial body and the fastening unit. The force-fitting connection between the fastening unit and the sacrificial body can be detachable or non-detachable. The force-fitting connection between the fastening unit and the sacrificial body can be achieved by screwing or pressing the sacrificial body onto the edge of the screw head and / or nut. The force-fitting 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 edge of the screw head and / or nut.

[0027] Alternatively, the sacrificial body can be attached to the fastening unit in a form-fitting manner. The form-fitting connection between the sacrificial body and the fastening unit can be detachable or non-detachable. The form-fitting connection can be a snap-on / snap-in connection. For the form-fitting 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 have a negative contour and a positive contour, respectively. The negative contour and the positive contour can mesh with each other, thereby preventing the movement of the sacrificial body relative to the fastening unit.

[0028] Alternatively, the sacrificial body can be connected to the fastening unit in a materially bonded manner. The materially bonded connection can be a welded connection, a soldered connection or an adhesive connection.

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

[0030] The sacrificial body can be cut from the metal sheet.

[0031] The protection body (particularly its protection segment) may be inclined toward the fastening unit. When the protection segment is inclined toward the fastening unit, the inner surface of the protection segment and the outer wall of the nut are not parallel to each other. When the protection body or the protection segment is formed to be inclined toward the fastening unit, the imaginary angle between the inner surface of the protection body or the protection segment and the outer wall of the nut is less than 90 degrees. The protection segment may extend over the entire height of the screw head and / or the nut.

[0032] The protective section can be inclined toward the fastening unit so that (particularly in the relative flow direction of the paving material) contact between the fastening unit and the paving material is prevented, at least no abrasive contact occurs, which could lead to wear of the fastening unit.

[0033] The protection segment may substantially have the shape of a half shell. The thickness / width of the half shell can be the same along the length or thickness direction.

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

[0035] On the inner side of the half shell there can be a recess for accommodating the entire screw head and / or the entire nut.

[0036] The protective segment can essentially be designed in the form of a protective hood.

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

[0038] The protection segment may extend radially from a lower end of the protection segment to an upper end of the protection segment.

[0039] The lower end of the protection section can be connected to the outer surface of the working unit.

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

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

[0042] The protection body, in particular the upper end of the protection segment, may extend to the upper end of the fastening unit, in particular the screw head or the nut. The protection body, in particular the upper end of the protection segment, may extend beyond the fastening unit, in particular the screw head or the nut.

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

[0044] The protective body can comprise one or more wear-resistant composite materials, thereby making it possible to extend the service life of the fastening unit.

[0045] The protective body can be composed of one or more wear-resistant composite materials, thereby extending the service life of the fastening unit.

[0046] The protective body can have or consist of 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 the conveying route of the paving material in the conveying direction, the paving material can be conveyed through a plurality of fastening units, for example from a material silo to a paving screed through a material channel in a tractor of a road paver. The sacrificial body can be placed on all or some of the fastening units. The protective body can be arranged next to all or some of the fastening units.

[0048] A protective body may be provided for each or two adjacent fastening units.

[0049] The transverse distributor device may have a shaft. The transverse distributor device may have a distributor screw which is detachably coupled to the shaft by means of a fastening unit. The distributor screw may have a body placed on the shaft. The distributor screw may have helical screw blades extending from the body and running around the shaft. The distributor screw, at least some of the segments of which are in contact with the paving material, may be a replaceable component of a road paver, in particular a transverse distributor device of a road paver.

[0050] The fastening unit may extend perpendicularly to the axis of rotation of the shaft.

[0051] The protective body can extend in a curvature direction opposite to the direction of rotation of the screw blades. As a result, the protective body extends in the relative flow direction of the paving material being conveyed by the rotation of the screw blades. This in turn can reduce the forces caused by the conveyed paving material that cause abrasion on the protective body and protect the protective body itself from wear.

[0052] The protective body can be designed in one piece with the distributor screw (in particular with the main body) as a casting. In this way, the work required for additionally assembling the protective body on the transverse distributor device can be avoided.

[0053] Alternatively, the protective body can be designed as a separate component from the distributor screw. The protective body can thus be replaced independently of the distributor screw. This also makes the manufacturing cost of the distributor screw lower.

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

[0055] The protection body may be fastened to the shaft. Preferably, a base portion of the protection body extends along the circumference of the shaft. The protection segment is preferably arranged at a predetermined angle to the base portion.

[0056] A material silo, a conveying device of a road paver for conveying paving material from the material silo to a transverse distributor device, a transverse distributor device or a paving screed plate can be a working unit of a road paver. The replaceable component can be a widened portion of a paving screed plate for fastening to a screed plate base of a paving screed plate. The replaceable component can be a pre-scraper for fastening to a screed plate base of a paving screed plate. The replaceable component can be a channel plate for fastening to a chassis. As described above, the replaceable component can in particular be a distributor screw of a transverse distributor device.

[0057] The wear protection device according to the invention can be used essentially for those fastening units which are attached to a road paver and which serve for detachable fastening of components and which can come into contact with the road paver during operation of the road paver with regard to material movements caused on the road paver. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The present invention is explained in more detail with reference to the following embodiments of the drawings. The drawings show:

[0059] Figure 1 shows a side view of a road paver for producing a paving layer,

[0060] Figure 2 shows a perspective view of a road paver with a paving screed,

[0061] Figure 3 shows a top view of a paving screed with a laterally retracted pull-out section,

[0062] Figure 4 Shows Figure 3 A paving screed with a pull-out section extending laterally,

[0063] Figure 5 A paving screed is shown with an extended pull-out section and with widening parts fastened laterally to the paving screed for producing the required working width,

[0064] Figure 6 shows a perspective view of a transverse distributor device of a road paver,

[0065] Figure 7 shows a schematic diagram of an embodiment of a fastening unit,

[0066] Figure 8 shows a perspective view (partial view) of a transverse distributor device with a protective unit in the form of a sacrificial body for the fastening unit,

[0067] Fig. 9 A schematic diagram showing a one-piece embodiment of the sacrificial body,

[0068] Fig.10 A schematic diagram showing a multi-part embodiment of a sacrificial body,

[0069] Fig.11 shows a perspective view (partial view) of a transverse distributor device with a wear protection device in the form of a protection body for a fastening unit,

[0070] Fig.12 shows a perspective view (partial view) of a transverse distributor device with an integral protective body,

[0071] Fig.13 A schematic diagram (partial view) of a transverse distributor device with an integral protective body is shown, and

[0072] Fig.14 A perspective view (partial view) of a transverse distributor device with an individually designed protective body is shown. DETAILED DESCRIPTION

[0073] Figure 1 A road paver 1 for producing a paving layer 2 on a foundation 3 is shown. The road paver 1 has a material silo 4 at the front in the paving travel direction R, and paving material 6 contained in the material silo 4 is transported to a paving screed 7 of the road paver 1 by means of a longitudinal conveying device 5, opposite to the paving travel direction R of the road paver 1. The longitudinal conveying device 5 is arranged in 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 portion 9a and a right scraper belt portion 9b. The paving material 6 is transferred from the scraper belt 9 of the longitudinal conveying device 5 to a transverse distributor device 10, which is positioned in front of the paving screed 7. The transverse distributor device 10 is designed to distribute the paving material 6 in front of the paving screed 7 transversely to the paving travel direction R.

[0074] Figure 2 The road paver 1 is shown in a perspective view. The paving screed 7 has a screed base body 11 and a laterally extendable pull-out part 12 in order to set the desired working width B of the produced paving layer 2. By widening the paving screed 7 in this way, a larger working width B can be produced for the newly produced paving layer 2.

[0075] Figure 3A schematic top view of a paving screed 7 of a road paver 1 is shown. Paving material 6 falls by means of a scraper belt 9 in front of a screed base 11 of the paving screed 7 and, as indicated by arrow P, is distributed along the front side 13 of the screed base 11 by means of a transverse distributor device 10. The rear wall 14 of the chassis 8 of the road paver 1 forms together with the front side 13 of the screed base 11 a transverse distributor channel 15 for the transverse distributor device 10. This transverse distributor channel 15 can be further expanded laterally to correspond to the widening of the paving screed 7. As shown in FIG. Figure 4 shown.

[0076] Figure 4 A schematic top view shows a paving screed 7 with an extended pull-out section 12. By widening the paving screed 7 in this way, a larger working width B can be produced for a newly produced paving layer 2. Figure 4 The transverse distributor channel 15 is shown to extend laterally beyond the screed base body 11. The paving material 6 falling from the scraper belt 9 can be transported along the widened transverse distributor channel 15 to the outside of the pull-out section 12. Figure 4 The transverse distributor device 10 arranged in the transverse distributor channel 15 is also expanded.

[0077] The transverse distributor channel 15 arranged in front of the paving screed plate 7 is formed on its outer area transverse to the paving travel direction R by means of a channel plate 16 supported on the chassis 8 of the road paver 1 and by means of a pre-scraper 17 fastened to the side of the screed base 11. Depending on the set working width B, the channel plate 16 and the pre-scraper 17 can be further expanded laterally to lengthen the transverse distributor channel 15. The same applies to the transverse distributor device 10.

[0078] Figure 5 A paving screed 7 is shown which has a projecting pull-out section 12 and a widened section 18 fastened laterally thereto in order to produce a very large working width B for the paving layer 2 . Figure 5 It is shown that the transverse distributor channel 15 is designed - along the screed base 11 , the pull-out part 12 and along the widening part (additional part) 18 fastened thereto - transversely to the paving travel direction R. Depending on the working width B, additional channel plates 16 and pre-scrapers 17 are installed to further enlarge the transverse distributor channel 15 .

[0079] Figure 6A perspective view of an embodiment of a transverse distributor device 10 is shown. The transverse distributor device 10 is fastened to the rear end of the chassis 8 of the road paver 1. The transverse distributor device 10 comprises a distributor screw 19 or a right distributor screw 19a and a left distributor screw 19b (in the paving travel direction of the road paver 1). Both distributor screws 19a, 19b are mounted in the center of a screw suspension 20. In the housing formed by the screw suspension 20, there is a screw drive (not shown) for driving the two distributor screws 19a, 19b. The transverse distributor device 10 comprises a shaft 21. Here, this can be two separate shafts 21 (right shaft 21a, left shaft 21b) or a common shaft 21 of the two distributor screws 19a, 19b. The right distributor screw 19a is detachably coupled to the shaft 21a. The left distributor screw 19b is detachably coupled to the shaft 21b.

[0080] The outer end of each shaft 21a, 21b, i.e. the end facing away from the screw suspension 20, is supported in a screw bearing 22a, 22b. Each screw bearing 22a, 22b is mounted at the lower end of a screw bearing support 23a, 23b. These screw bearing supports 23 here have essentially vertically aligned tubes 24a, 24b, which are fastened to the chassis 8 of the road paver 1 by means of a fastening plate 25.

[0081] The paving material 6 can have a viscous mixture (e.g. asphalt) and / or a non-viscous mixture (e.g. gravel). The asphalt mixture can consist of an aggregate mixture with a very high proportion of crushed particles and preferably a polymer-modified asphalt as a binder. This paving material 6 with hard particles rubs against the fastening unit 26 of the road paver 1 that is in contact with the paving material (see Figure 7 ,Left: Screw-nut connection; Figure 7 , Middle: Screw connection; Figure 7 , right: bolt-nut connection) and causes the fastening unit 26 to wear, so that the fastening unit 26 cannot be easily loosened with a tool such as a wrench.

[0082] The invention provides a wear protection device 27 for the fastening unit 26, which will be referred to in detail in Figures 8 to 14 Describe in more detail.

[0083] Figure 7 An embodiment of a fastening unit 26 for use on a road paver 1 is shown.

[0084] The fastening unit 26 connects a replaceable component 30 of the road paver 1 to the chassis 8 or a working unit 31 of the road paver 1. The working unit 31 can be, for example, a material silo 4, a longitudinal conveying device 5, a paving screed 7 or a transverse distributor device 10. The replaceable component 30, in particular the component against which the paving material 6 flowing from the material silo 4 to the transverse distributor device 10 rubs, is, for example, a widening 18, a channel plate 16, a pre-scraper 17 and / or a distributor screw 19, 19a, 19b.

[0085] The construction principle of the embodiment of the wear protection device 27 for the fastening unit 26 is described by way of example with reference to the wear protection device 27 used on the transverse distributor device 10. Such a wear protection device 27 can also be used for other fastening units 26 of the road paver 1, in particular for fastening units 26 of the road paver 1 which come into contact with the paving material 6.

[0086] Figure 8 A perspective view of a portion of the transverse distributor device 10 is shown. As described above, the transverse distributor device 10 includes 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 body 33 placed on the shaft 21 and screw blades 34 extending from the body 33 and running around the shaft 21. The distributor screw 19 (particularly the body 33 of the distributor screw 19) is fastened to the shaft 21 of the transverse distributor device 10 by means of the fastening units 26. Figure 8 In the embodiment, the fastening unit 26 is presented as a screw-nut connection. The fastening unit 26 includes a screw 28 having a hexagonal screw head 28a and a nut 29 or a cap nut 29a fastened to the other end of the screw 28 (see Figure 7 , left figure).

[0087] In this embodiment, the wear protection device 27 is designed as a sacrificial body 32 for placement on the fastening unit 26. Figure 8 In the embodiment of the invention, the sacrificial body 32 is located on the nut 29 or the cap nut 29a of the fastening unit 26 and completely covers the fastening unit 26. The sacrificial body 32 may also not completely cover the nut 29 or the cap nut 29a of the fastening unit 26. On the opposite side, another sacrificial body can be placed on the screw head 28a. The sacrificial body 32 thus prevents contact and thus friction between the fastening unit 26 and the paving material 6 flowing around the fastening unit 26 (or the sacrificial body 32) in the area of ​​the nut 29 or the cap nut 29a. During operation of the transverse distributor device 10, the distributor screw 19 or the screw blades 34 rotate in a direction of rotation 35. In contrast, the paving material 6 moves in a flow direction 36 that is substantially opposite to the direction of rotation 35 of the distributor screw 19.

[0088] Fig. 9 A schematic diagram of a one-piece embodiment of a sacrificial body 32' is shown. 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 a screw head 28a or a nut 29 or a cap nut 29a. The receiving area 37 is provided as an opening of the sacrificial body 32'. The one-piece sacrificial body 32' can be arranged / fastened on the hexagonal nut 29 or a cap nut 29a or on the hexagonal screw head 28a in a form-fitting manner.

[0089] Fig.10 A schematic diagram of a multi-piece embodiment of a sacrificial body 32" is shown. The sacrificial body 32" is designed as a multi-piece or two-piece construction device 32b (two-piece sacrificial body 32"). The two-piece sacrificial body 32" has a receiving area 37' with an inner contour 38', which is designed to receive a screw head 28a or a nut 29 or a cap nut 29a. The receiving area 37' is provided as an opening of the sacrificial body 32". The two-piece sacrificial body 32" has two half shells 40a, 40b. After the half shells 40a, 40b have been applied to the fastening unit 26, the half shells 40a, 40b can be fastened to each other by means of threaded connections 41a, 41b.

[0090] Fig.11 A perspective view (partial view) of a transverse distributor device 10 is shown.

[0091] exist Fig.11 In the embodiment shown, the wear protection device 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 laterally shields the fastening unit 26 so that the fastening unit 26 does not come into contact with the paving material 6 or in any case only rarely comes into contact with the paving material 6. The side (second side) 44 of the fastening unit 26 arranged opposite the side 43 facing the conveyed paving material 6 is free, for example separated from the other protective body 42. Therefore, the fastening unit 26 can be freely approached (for example for a wrench tool) from the second side 44, so that disassembly is convenient. Fig.11 It is also shown that the body 33 has a recess 39 for accommodating the hexagonal screw head 28a of the fastening unit 26, namely on the opposite side of the cap nut 29a (see Fig.13 ), the groove 39 accommodates the screw head 28a in a form-fitting manner so that the screw head 28a cannot be twisted.

[0092] exist Fig.11 In the embodiment, the protective body 42 is designed as an integral part of the distributor screw 19 or the detachable screw blade 34 in order to protect the cap nut 29 a of the fastening unit 26 . Fig.11It is shown that the distributor screw 19 is assembled from a plurality of segments A, B (ie a plurality of screw blades 34) mounted adjacent to each other.

[0093] Fig.12 A perspective view (partial view) of a transverse distributor device 10 with an integral protective body 42 for a fastening unit 26 is shown. It can be seen here that the protective body 42 has a protective section 45 which is inclined, ramp-shaped or arched towards the fastening unit 26. The protective body 42 or the protective section 45 extends from the body 33 of the section A of the distributor screw 19. The protective body 42 or the protective section 45 is formed in one piece with the distributor screw 19. The protective section 45 extends over the entire height 46 of the nut 29 or the cap nut 29a. The protective section 45 is in the form of a half shell 47. The relative flow direction 36 of the paving material 6 and the rotation direction 35 of the distributor screw 19 are shown.

[0094] Fig.13 A schematic diagram (partial view) of a transverse distributor device 10 with a protective body 42 for a fastening unit 26 is shown. In this embodiment, the protective section 45 does not extend over the entire height 46 of the nut 29 or cap nut 29a. The protective section 45 has an inner side 48, and the distance 49 between the inner side 48 of the protective section 45 and the fastening unit 26 varies along the length 50 of the inner side 48. The direction of rotation 35 of the distributor screw 19 is shown. The protective body 42, in particular the protective section 45, extends along a curvature direction K opposite to the direction of rotation 35 of the screw blades 34.

[0095] Fig.14 A schematic diagram (partial view) of a transverse distributor device 10 of another embodiment with a protective body 42 is shown. The protective body 42 is fastened to the shaft 21 as a separate component and has a base portion 51 extending along a circumferential surface 52 of the shaft 21. A protective segment 45 of the protective body 42 extends in an arcuate shape from the base portion 51 toward an upper end 54 of the cap nut 29a. The protective segment 45 encloses a predetermined angle with the base portion 51.

Claims

1. A road paver (1) for producing a paving layer (2) with paving material (6), the paving material (6) being conveyed from a material silo (4) of the road paver (1) to a transverse distributor device (10) of the road paver (1) in the opposite direction to the paving travel direction (R) of the road paver (1), and the paving material (6) being distributed over a working width (B) of a paving screed (7) of the road paver (1) by means of a transverse distributor device (10) transverse to the paving travel direction (R) of the road paver (1), wherein: The road paver (1) has a replaceable component (30) which is in contact with the paving material (6) at least during the 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 a chassis (8) of the road paver (1), wherein a wear protection device (27) for the fastening unit (26) is provided on the road paver (1), characterized in that the wear protection device (27) has a sacrificial body (32) for being placed on the fastening unit (26) and / or a protective body (42) with a protective section (45), which is at least partially constructed in a ramp-shaped or curved manner and guides the paving material (6) away from the fastening unit (26).

2. The road paver according to claim 1, characterized in that: The protective body (42) is arranged only on a side (43) of the fastening unit (26) that faces the conveyed paving material (6).

3. The road paver according to claim 1, characterized in that: The fastening unit (26) includes a screw (28) having a screw head (28a) and / or a nut (29) fastened to the screw (28).

4. The road paver according to claim 3, characterized in that: The nut (29) is a hexagonal nut (29b) or a cap nut (29a).

5. The road paver according to claim 2, characterized in that: The fastening unit (26) includes a screw (28) having a screw head (28a) and / or a nut (29) fastened to the screw (28).

6. The road paver according to claim 5, characterized in that: The nut (29) is a hexagonal nut (29b) or a cap nut (29a).

7. The road paver according to claim 3, characterized in that: When the sacrificial body (32) is placed on the fastening unit (26), the sacrificial body (32) is designed such that the sacrificial body (32) completely covers the screw head (28a) and / or the nut (29).

8. The road paver according to claim 7, characterized in that: The nut (29) is a cap nut (29a).

9. The road paver according to claim 5, characterized in that: When the sacrificial body (32) is placed on the fastening unit (26), the sacrificial body (32) is designed such that the sacrificial body (32) completely covers the screw head (28a) and / or the nut (29).

10. The road paver according to claim 9, characterized in that: The nut (29) is a cap nut (29a).

11. The road paver according to any one of claims 1 to 10, characterized in that: The wear protection device (27) is a one-piece component (32a) or a multi-piece construction (32b).

12. The road paver according to claim 11, characterized in that: The wear protection device (27) is the sacrificial body (32).

13. The road paver according to claim 11, characterized in that: The multi-piece construction device (32b) comprises two half shells (40a, 40b).

14. The road paver according to any one of claims 1 to 10, characterized in that: The sacrificial body (32) is fastened to the fastening unit (26) in a force-fitting and / or form-fitting manner.

15. The road paver according to claim 14, characterized in that: The sacrificial body (32) is fastened to a cap nut (29a) of the fastening unit (26) in a force-fitting and / or form-fitting manner.

16. The road paver according to any one of claims 1 to 10, characterized in that: The sacrificial body (32) is connected to the fastening unit (26) in a form-fitting and / or materially bonding manner.

17. The road paver according to any one of claims 1 to 10, characterized in that: The protection section (45) is inclined toward the fastening unit (26).

18. The road paver according to claim 17, characterized in that: The protective section (45) extends over the entire height (46) of the screw head (28a) and / or the nut (29).

19. The road paver according to claim 18, characterized in that: The nut (29) is the cap nut (29a).

20. The road paver according to any one of claims 1 to 10, characterized in that The protective section (45) is designed in the form of a protective cover and 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).

21. The road paver according to any one of claims 1 to 10, characterized in that: The protective body (42) is designed as an integral extension of the replaceable component (30) or is separated from the replaceable component (30) and fastened to the road paver (1) as a separate component.

22. The road paver according to claim 21, characterized in that: The protective body (42) is fastened to the working unit (31) of the road paver (1) separately from the replaceable component (30) as a separate component.

23. The road paver according to any one of claims 1 to 10, characterized in that The transverse distributor device (10) has a shaft (21) and at least one distributor screw (19) which is detachably fastened to the shaft (21) by means of the fastening unit (26), wherein the distributor screw (19) has a body (33) placed on the shaft (21) and screw blades (34) extending from the body (33) and running around the shaft (21), wherein the distributor screw (19) is a replaceable component (30) of the road paver (1).

24. The road paver according to claim 23, characterized in that: The distributor screw (19) is a replaceable component (30) of a transverse distributor device (10) of the road paver (1).

25. The road paver according to claim 23, characterized in that: The protection body (42) extends along a curvature direction (K) opposite to the rotation direction (35) of the screw blade (34).

26. The road paver according to claim 25, characterized in that: The protection section (45) extends along a curvature direction (K) opposite to the rotation direction (35) of the screw blade (34).

27. The road paver according to claim 23, characterized in that: The protective body (42) is formed integrally with the distributor screw (19), or the protective body (42) is formed separately from the distributor screw (19) as a separate component.

28. The road paver according to claim 27, characterized in that: The protective body (42) is formed integrally with the main body (33), or the protective body (42) is formed separately from the distributor screw (19) as a separate component.

29. The road paver according to claim 25, characterized in that: The protective body (42) is formed integrally with the distributor screw (19), or the protective body (42) is formed separately from the distributor screw (19) as a separate component.

30. The road paver according to claim 28, characterized in that: The protective body (42) is formed integrally with the main body (33), or the protective body (42) is formed separately from the distributor screw (19) as a separate component.

31. The road paver according to claim 23, characterized in that: The protective body (42) is fastened to the shaft (21) as a separate component.

32. The road paver according to claim 31, characterized in that: The base portion (51) of the protection body (42) extends along the circumferential surface (52) of the shaft (21), and the protection segment (45) forms a predetermined angle with the base portion (51).

33. A road paver according to any one of claims 24 to 30, characterized in that The protective body (42) is fastened to the shaft (21) as a separate component.

34. The road paver according to claim 33, characterized in that: The base portion (51) of the protection body (42) extends along the circumferential surface (52) of the shaft (21), and the protection segment (45) forms a predetermined angle with the base portion (51).

35. A road paver according to any one of claims 1 to 10, characterized in that The replaceable component (30) is a widened portion (18) of the paving screed (7) for fastening to the screed base (11) of the paving screed (7) by means of the fastening unit (26), and / or a pre-scraper (17) for fastening to the screed base (11) of the paving 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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