Milling drum

Abstract

The invention relates to a milling drum (50) with a milling drum tube (51), particularly for a road milling machine, wherein lower parts (10) of tool systems are projecting onto the surface (52) of the milling drum tube (51), wherein at least some of the lower parts (10) are spaced apart from one another in the circumferential direction of the milling drum tube (51), and wherein infill elements (60) are arranged in the space between at least some of adjacent lower parts (10), which are each welded to the lower part (10) arranged in front of and behind the filler element (60) in the circumferential direction of the drum and to the surface (52) of the milling drum tube (51). According to the invention, for improved load-bearing capacity of the tool systems and filler elements mounted on the milling drum, at least some of the filler elements (60) have a base body (60).1) has at least one radially outwardly projecting projection (65, 67) formed on it, and that the projection (65, 67) is welded to the rear side (13.2) of the circumferentially forward lower part (10) or to the front side (13.1) of the feed-direction rear lower part (10).

Description

[0001] The invention relates to a milling drum with a milling drum tube for a soil milling machine, wherein lower parts of tool systems are attached to the surface of the milling drum tube in a projecting manner, wherein at least a part of the lower parts are arranged spaced apart from each other in the circumferential direction of the milling drum tube, wherein in the spaced area between a part of the circumferentially spaced lower parts, filling elements are arranged, which are each welded to the lower part arranged in the circumferential direction in front of and behind the filling element in the circumferential direction of the drum and to the surface of the milling drum tube.

[0002] Milling drums according to the invention are used in soil cultivation machines to remove the soil being worked. Road milling machines, for example, are used to mill the surface of a roadway. The milling drum is guided over the road surface. Tool systems projecting radially outwards are attached to the milling drum. These tool systems can, for example, have a lower part and a chisel holder that is interchangeably mounted therein. The chisel holder can accommodate a chisel that is either interchangeable or non-interchangeable. The chisel, for example a round-shank chisel, can be used to work and remove the road surface. Such milling drums are described, for example, in EP 2 411 581 B1 or EP 3 162 959 B1.

[0003] On milling drums according to the invention, the tool systems can be at least partially attached and arranged such that they form parts of a clearing and loading screw. For this purpose, the tool systems are arranged helically one behind the other on the surface of the milling drum tube. Preferably, several clearing and loading screws can be formed on the surface of the milling drum tube. In the channel areas between the clearing and loading screw(s), the removed soil material is conveyed, for example, towards the axial center of the milling drum tube. Ejectors can be arranged in this area. The ejectors throw the soil material out of the working area of ​​the milling drum, for example, onto a conveyor belt.

[0004] In the context of this document, "radial" refers to a relationship to the rotational axis of the milling drum. However, "radial" does not necessarily mean that a component must be arranged exactly perpendicular to the rotational axis of the milling drum. Rather, it also describes an essentially perpendicular orientation.

[0005] In the context of this document, "axial" refers to a relationship to the rotational axis of the milling drum. However, "axial" does not necessarily mean that a component must be arranged exactly axially to the rotational axis of the milling drum. Rather, it also describes a generally axial orientation.

[0006] "In the circumferential direction" in the context of this document refers to the rotational axis of the milling drum. However, "in the circumferential direction" does not necessarily mean that a component must be arranged exactly in the direction of rotation of the milling drum. Rather, it also describes an arrangement that is essentially aligned in the direction of rotation.

[0007] From JP H 083919 A, a milling drum is known on whose surface helical ridges are attached. Interchangeable tool holder systems, namely a combination consisting of a tool holder and a tool, can be mounted on these ridges.

[0008] Similar to JP H 083919 A, DE 37 08 520 C1 describes a milling drum on whose surface a comb in the form of a helical helix is ​​applied to form a transport screw. Tool holders can be attached to the comb. DE 37 08 520 C1 additionally describes a variant embodiment in which a metal plate is screwed onto the milling drum between the tool holders. The metal plates, projecting radially beyond the surface of the milling drum, bridge the gap between adjacent tool holders to enhance the conveying effect.

[0009] Systems are also known in the prior art in which the gap between two tool holders is bridged by means of a cuboid-shaped filler element to form the broaching and loading screw. This filler element is welded to the surface of the milling drum tube and the two adjoining tool holders. High-performance milling machines are sometimes subjected to extremely high loads, which can lead to damage of the filler element.

[0010] It is therefore an object of the invention to provide a milling drum of the type mentioned at the outset in which the load-bearing capacity of the tool systems and the filling elements on the milling drum is improved.

[0011] This problem is solved by having at least some of the filling elements have a base body to which at least one radially outwardly projecting projection is formed with respect to the axis of rotation of the milling drum, and by welding the projection to the rear of the lower part which is forward in the circumferential direction or to the front of the lower part which is rear in the feed direction.

[0012] The inventors recognized that during machining, the connection between the filler element and the adjacent tool holder is subjected to high stress. This connection is formed by a weld material. This weld material is relatively brittle and not very ductile. If extremely high loads are introduced into the tool systems, these loads are transferred to the lower parts. The lower parts are then elastically deformed, which in extreme cases can lead to damage of the weld.

[0013] To counteract this, the invention provides a projection that extends beyond the base body of the filler element. This projection is welded to the adjacent lower part. The projection introduces elasticity into the filler element, as it can deform elastically relative to the base body. Under extreme load conditions, the weld connecting the projection to the lower part is not subjected to excessive stress; instead, the material stresses are dissipated into the base body via the projection. This prevents failure of the weld between the lower part and the filler element. Overall, a milling drum according to the invention is therefore characterized by higher load-bearing capacity, leading to an increase in the milling drum's performance.

[0014] According to a preferred embodiment of the invention, a front and a rear projection are integrally formed on the base body, spaced apart from each other in the circumferential direction, and the circumferentially front projection is welded to the front lower part and the rear projection to the rear lower part. The fact that both lower parts connected to the filling element are each connected by a projection further improves the load-bearing capacity. In particular, each projection can be individually adapted to the load-bearing state of the adjacent front or rear lower part. It has been found that significantly different stress conditions occur in the connection area of ​​the front projection to the front lower part and in the connection area of ​​the rear projection to the rear lower part.

[0015] To avoid harmful stress concentrations on the molded part, such a design may include the following features: the base body is radially bounded on the outside by a finishing surface; the front projection, arranged circumferentially at the front of the base body, has a rear transition section, and the rear transition section and the finishing surface are joined by a rounded transition; and / or the rear projection, arranged circumferentially at the rear of the base body, has a front transition section, and the front transition section and the finishing surface are joined by a rounded transition. Preferably, the rounded transition(s) may also be designed to increase the cross-section of the projection in the area where it connects to the base body. This increases the section modulus against bending.

[0016] If it is intended that the rear transition section and the end surface and / or the front transition section and the end surface are tangentially transitioned into each other, then discontinuities that can lead to notch stresses are avoided in the transition area between the base body and the projection.

[0017] One possible embodiment of the invention is such that the end surface is convex and / or concave, at least in a partial area. Such curvature allows for targeted influence on the cross-section of the base body and thus its bending and tensile strength. A concave curvature leads to a reduction in the cross-section, while a convex curvature leads to an increase. By using curvatures rather than stepped sections, continuous cross-sectional transitions are created, which improve the load-bearing capacity.

[0018] Another preferred embodiment of the invention may be such that the front and / or rear projection has a radially outer head region which is coupled to the base body via a foot region, and that the projection in the foot region has a lower resistance moment against bending about an axis parallel to the axis of rotation of the milling drum than the part of the head region of the front and / or rear projection adjoining the foot region.

[0019] One embodiment of the invention is characterized in that the front projection has a front longitudinal edge at its radially outer end region, the front longitudinal edge extending in the direction of the rotation axis of the milling drum, and the front longitudinal edge being connected to the front lower part by means of a weld. Additionally or alternatively, it can also be provided that the rear projection has a rear longitudinal edge at its radially outer end region, the rear longitudinal edge extending in the direction of the rotation axis of the milling drum, and the rear longitudinal edge being connected to the rear lower part by means of a weld. The front and rear longitudinal edges are arranged far from the surface of the milling drum. This improves the support of the filler element against the adjacent lower part. The welded joint in the area of ​​the longitudinal edges allows for better transmission of the bending forces.

[0020] A particularly preferred embodiment of the invention is such that the front projection has front transverse edges on its opposite sides, which are spaced apart from each other in the direction of the rotation axis of the milling drum, and that the front transverse edges are welded to the front lower part, and / or that the rear projection has rear transverse edges on its opposite sides, which are spaced apart from each other in the direction of the rotation axis of the milling drum, and that the rear transverse edges are welded to the rear lower part. The inventors have recognized that a three-axis stress state occurs during machining, in which torsional loads also arise, in particular, in the transition area between the lower part and the filling element. To take this into account, the projection according to the invention is welded to the adjacent lower part on its opposite sides in the area of ​​the front and rear transverse edges.This significantly increases the torsional strength of the connection.

[0021] It is preferably provided that the distance between the front and / or rear transverse edges in the direction of the rotation axis of the milling drum and in the connection area of ​​the filler element to the surface of the milling drum is at least 0.4 to 1.0 times the width of the associated lower part in this direction and in the connection area of ​​the lower part to the surface of the milling drum. Such a design is particularly suitable for use of the milling drum in road milling machines. Manufacturing the milling drum is particularly simple if, in this case, the distance between the front and / or rear transverse edges corresponds essentially (preferably with a deviation of no more than 10%) to the width of the associated lower part in the connection area of ​​the lower part to the surface of the milling drum.

[0022] Preferably, the distance between the front and rear transverse edges in the direction of the milling drum's axis of rotation is equal. In this case, the filler element can be easily manufactured as a forged part. Alternatively, the filler element can be easily manufactured as a stamped part from a sheet metal blank or as a flame-cut part from a sheet metal blank.

[0023] Preferably, the distance between the front and / or rear transverse edges in the direction of the rotation axis of the milling drum is at least 30 mm and at most 80 mm. A design in which the distance between the front and / or rear transverse edges is at least 55 mm and at most 60 mm has proven to be particularly durable.

[0024] Additionally or alternatively, the length of the filling element may be at least 40 mm and at most 140 mm. Preferably, the length of the filling element may be at least 55 mm and at most 75 mm.

[0025] The length of the filling element is understood to be the extent of the filling element in the circumferential direction of the milling drum.

[0026] According to a preferred embodiment of the invention, at least one of the projections may be limited on its side facing away from the milling drum by a cover section, and the extent of the cover section in the circumferential direction of the milling drum may be at least 15 mm. In this way, a sufficient width of the weld seam can be achieved in the area of ​​the cover section for the purpose of a stable connection of the projection in the area of ​​the cover section to the adjoining lower part.

[0027] Preferably, the weld seam extends over the entire length of the cover section running in the circumferential direction of the milling drum. This results in a stress-optimized transition between the projection and the adjoining lower section.

[0028] A particularly preferred embodiment of the invention may be such that the ratio of the length of the filling element in the circumferential direction of the milling drum, preferably in the connection area of ​​the filling element to the surface of the milling drum, to the length of the lower part in the circumferential direction of the milling drum, preferably in the connection area of ​​the lower part to the surface of the milling drum, is selected in the range between 0.4 - 1.4, preferably in the range between 0.55 - 0.75.

[0029] Within the scope of the invention, it can also be provided that the radial projection of the front projection over the base part is greater than the radial projection of the rear projection over the base part. This results in a load-optimized design.

[0030] If it is provided that the front and / or the rear longitudinal edge is arranged radially offset from the radially outer end of the projection in order to form a chamfer running in the direction of rotation in the form of a weld preparation, then the production of a high-strength weld is simplified.

[0031] The invention will be explained in more detail below with reference to an embodiment illustrated in the drawings. The drawings show: Figure 1 A partial perspective view of a milling drum for a road milling machine Figure 2 In side view, a tool system with a base and a chisel holder, Figure 3 the tool system according to Figure 1 in a perspective view from behind, Figure 4 a chisel holder in perspective front view, Figure 5 the lower part of the tool system according to the Figures 1-3 in perspective side view, Figure 6 the lower part according to Figure 5 in perspective view from behind, Figure 7 a partial representation of the milling drum according to Figure 1 in enlarged view, Figure 8 the representation according to Figure 7 from a changed perspective, Figure 9 a filling element for the milling drum according to Figure 1 in perspective front view and Figure 10 a variant of a filling element for the milling drum according to Figure 1 in side view.

[0032] Figure 1 Figure 1 shows a milling drum 50 for a road milling machine in a perspective partial view. As the illustration shows, the milling drum 50 has a milling drum tube 51. Tool systems are attached to the surface 52 of the milling drum tube 51. The tool systems preferably comprise at least a lower part 10 and a tool holder 30. Preferably, the tool holder 30 is detachably attached to the lower part 10.

[0033] The lower parts 10 are arranged helically relative to each other on the surface 52 in the circumferential direction, forming a cutting and reaming helix. The lower parts 10 are fastened to the surface 52 by means of welded connections.

[0034] Advantageously, at least one ejector 53 is arranged in the area of ​​the center of the milling drum tube 51. The cutting and reaming helixes are helically wound around the circumference of the surface 52 towards the ejectors 53. The material removed by the tool holders 30 during machining is transported by the cutting and reaming helixes to the ejectors 53. The ejectors 53 convey the material from the working area of ​​the milling drum 50, for example, onto a conveyor belt (not shown).

[0035] The gaps between the individual tool systems can be at least partially filled by means of filler elements 60. Figure 1For clarity, three tool systems are shown, connected in series by means of 60 filler elements.

[0036] Of course, several or all tool systems on the milling drum 50 can also be connected by means of filling elements 60.

[0037] In the present embodiment, the milling drum 50 is equipped with so-called corner rings at its longitudinal ends. A plurality of tool systems are arranged one behind the other in these corner rings. The remaining tool systems attached to the milling drum 50, or at least a large proportion of these tool systems, in particular those forming a clearing and loading screw, are preferably spaced apart from one another and connected to filling elements 60.

[0038] The design and arrangement of the filler elements 60 will be discussed in more detail later.

[0039] The Figure 1 and 2show a tool system with a base 10 and a chisel holder 30 attached to it.

[0040] The lower part 10 has a connection side 11, which may have a contact surface, preferably concavely curved. By means of this connection side 11, the lower part 10 can be placed onto the convex surface 52 of the Figure 1 The milling drum tube 50 shown is placed on it and the lower part 10 is attached to it in a suitable manner, for example by means of a welding connection.

[0041] The lower part 10 may be provided with lateral recesses 12 in the transition area to the connection side 11. These recesses 12 can be used to receive welding material to form a tack weld.

[0042] The base body 13 of the lower part 10 forms the lower connection side 11. This base body 13 has a front face 13.1 facing forward in the feed direction V and a rear face 13.2 facing backward in the feed direction V. The lower part 10 is bounded laterally by side surfaces. The feed direction V runs in Figure 2 from left to right. This feed direction V results from the intended use of the chisel holder 30 or the tool system.

[0043] It may be provided that at least one paragraph 13.3 is present in the area of ​​at least one of the side surfaces in order to form a material drainage area.

[0044] According to the Figure 5The lower part 10 may have a holder receptacle 14. The holder receptacle 14 has front support surfaces 15.1, 15.2, which are arranged at least partially in front of a plug receptacle 18. The plug receptacle 18 may be formed as a through-hole or as a recess in the base body 13 of the lower part 10.

[0045] Preferably, a recess 15.3 is arranged between the two front support surfaces 15.1, 15.2 in the area in front of the plug receptacle 18. The two front support surfaces 15.1, 15.2 are arranged at an angle to each other, as is particularly evident Figure 6 This angle opens towards the top of the lower part 10.

[0046] It is also possible that the lower part 10 has at least one rear support surface 16.1, 16.2 in its area facing the rear side 13.2. In the present embodiment, two rear support surfaces 16.1, 16.2 are used. The rear support surfaces 16.1, 16.2 are aligned with each other, so that they are arranged on the same plane. However, it is also conceivable that the two rear support surfaces 16.1, 16.2 are at an angle to each other, preferably forming an obtuse angle.

[0047] The two rear support surfaces 16.1, 16.2 are each formed by support sections 19.3. The support sections 19.3 may form parts of a projection 19.2. Preferably, the two projections 19.2, each forming a support section 19.3, are spaced apart from each other transversely to the feed direction V.

[0048] Figure 5This illustrates that the two rear support surfaces 16.1, 16.2 can also be connected to each other by a transition section 16.3. It is possible that the transition section 16.3 is then also used to support the chisel holder 30.

[0049] Evidentiously Figure 5 On both sides of the lower part 10, a front support surface 15.1, 15.2 transitions into a rear support surface 16.1, 16.2. Advantageously, recesses 17, which can be groove-like, are provided between the front support surfaces 15.1, 15.2 and the associated rear support surfaces 16.1, 16.2. Thus, the front support surfaces 15.1, 15.2 are spatially separated from the rear support surfaces 16.1, 16.2 to form defined support areas.

[0050] Figure 10This shows that the socket 18 can be equipped with an insertion extension 18.1 at its upper end. This insertion extension 18.1 serves to facilitate the insertion of a plug-in end 44 of the chisel holder 30 (see figure). Figure 5 ).

[0051] An overload support area 18.4 can be provided in the area of ​​the plug receptacle 18. This overload support area 18.4 preferably has two clamping surfaces 18.5, 18.6, which are arranged at an angle to each other. The two laterally arranged clamping surfaces 18.5, 18.6 can be connected by means of a locking surface 18.7. The locking surface 18.7 also extends at an angle to the clamping surfaces 18.5, 18.6. Preferably, each clamping surface 18.5, 18.6 forms the same angle with the locking surface 18.7, which is preferably obtuse.

[0052] With the chisel holder 30 mounted, at least a part of the functional surfaces and functional sections of the lower part 10, in particular the clamping surfaces 18.5, 18.6, the front support surfaces 15.1 15.2, the rear support surfaces 16.1, 16.2 etc., the insertion extension 18.1 and / or the shank support surface 18.2 described below, can be arranged symmetrically to a central longitudinal plane of the chisel holder 30.

[0053] Preferably, the overload support area 18.4 with its clamping surfaces 18.5 and 18.6 and the securing surface 18.7 is formed by the insertion extension 18.1, or is arranged in the area of ​​the insertion extension 18.1, in order to achieve a compact design.

[0054] The Figures 5 and 6The figures further show that a front shaft support surface 18.2 facing the front face 13.1 is formed within the socket 18. The front shaft support surface 18.2 may be interrupted by a recess 18.3, so that partial surfaces of the front shaft support surface 18.2 are formed on both sides of the recess 18.3. The recess 18.3 may, in particular, be groove-shaped. The recess may extend from the underside, in particular the connection side 11, of the base body 13 in the direction of the longitudinal extent of the socket 18. A shaped element (not shown), in particular a clamping sleeve, a dowel pin, or the like, may be received in the recess 18.3.

[0055] A screw receptacle 19 is provided on the reverse side of the base body 13 of the lower part 10. A fastening screw, in particular a pressure screw 20, can be screwed into the screw receptacle 19, as shown. Figure 2 shows.

[0056] Preferably, access to the screw receptacle 19 is protected in the area between the two projections 19.2 (see Figure 2 It is possible that the screw receptacle 19 is incorporated here into a surface section 19.1 that extends transversely between the two projections 19.2. The projections 19.2 are bounded by boundary surfaces 19.4 facing the screw receptacle 19. This shows Figure 2 .

[0057] Figure 4 This illustrates the structure of the chisel holder 30. As this illustration shows, the chisel holder 30 has a support body 35.

[0058] As described below, the support body 35 has a tool holder 32 with a central longitudinal axis M on the machining side and a socket 44 with a socket longitudinal axis 44.2 on an opposite socket end. As shown in the exemplary embodiment, the central longitudinal plane of the tool holder 30 can be defined by the central longitudinal axis M and the socket axis 44.2.

[0059] A support section 33 is integrally formed on the support body 35 in the area of ​​one machining side. This support section 33 is preferably designed in the form of a projection or may have a projection. The support section 33 forms at least part of the tool holder 32. Preferably, the tool holder 32 is designed as a bore and has the central longitudinal axis M. The position of the central longitudinal axis M of the tool holder 32 is determined by Figure 2shown and is formed by the bore axis. Alternatively, a cutting tip can also be provided, in particular attached, to the support body 35 on the machining side.

[0060] At its free end, the support section 33 forms a bearing surface 31, which preferably extends radially to the central longitudinal axis M of the chisel holder 32. The bearing surface 31 is particularly preferably formed circumferentially.

[0061] The support surface 31 serves to support a wear-resistant disc of a (not shown) round-shank chisel. Such a round-shank chisel is inserted with its chisel shank into the chisel holder 32 of the chisel holder 30. The wear-resistant disc is arranged between the support surface 31 and a head of the round-shank chisel and is freely rotatable about the central longitudinal axis M of the chisel holder 32.

[0062] A centering projection 31.1 can be formed in the area of ​​the bearing surface 31. This centering projection 31.1 can, for example, be designed as a circumferential bead. The centering projection 31.1 serves to center the wear protection disc described above on the bearing surface 31. For this purpose, the wear protection disc can be provided with a circumferential groove on its underside, on the side facing the bearing surface 31. The centering projection 31.1 engages in this circumferential groove, while the underside of the wear protection disc rests on the bearing surface 31.

[0063] The support section 33 can be designed with one or more wear markings 33.1. If several wear markings 33.1 are used, they are preferably arranged spaced apart from each other in the direction of the central longitudinal axis M of the chisel holder 32, as shown. Figure 4This can be seen, for example, in the wear markings 33.1, which can be designed as grooves that are at least partially circumferential. This also shows Figure 4 .

[0064] The support section 33 is connected to the support body 35 via a transition section 34. Preferably, the transition section 34 widens the support section 33 in the direction of the support body 35, at least in some areas.

[0065] The support body 35 may have a skirt 35.1 on its front side, which is arranged at least partially in front of the support section 33. The skirt 35.1 may be equipped with recesses 35.2 to enable improved material transport and thus better wear resistance of the chisel holder 30.

[0066] For improved stiffness, the support section 33 may be coupled to the support body 35 by means of stiffening struts 35.3. The stiffening struts 35.3 can extend to both sides and / or along the rear side of the support section 33, as shown in the Figures 4 show.

[0067] The chisel holder 30 is bounded by side surfaces 35.4 in the area of ​​its sides, which extend from its front to its rear. The side surfaces 35.4 preferably have frontal chamfers 35.5 to taper the apron 35.1 in an arrow-like shape at the front. This improves material removal during operation. At the front, the support body 35 has a front piece 35.6, which preferably borders the apron 35.1 at the front.

[0068] Evidentiously Figure 3It is possible that the chisel holder 30 has an ejector receptacle 36 on its rear side. The ejector receptacle 36 preferably has two functions.

[0069] Firstly, the ejector receptacle 36 serves to hold an ejector tool, which provides access to the chisel receptacle 32. Using the ejector tool, a chisel held in the chisel receptacle 32 can then be driven out in the direction of the central longitudinal axis M of the chisel receptacle 32.

[0070] The second function of the ejector receptacle 36 is to remove debris material that has accumulated in the area of ​​the chisel receptacle 32 during operation. This debris material is conveyed radially outwards through the ejector receptacle 36.

[0071] How Figure 3As further illustrated, the ejector receptacle 36 is bounded by two side surfaces 36.1. Alternatively, the ejector receptacle 36 may be bounded on its top side by a cover section 36.3. Preferably, the ejector receptacle 36 is bounded by both side surfaces 36.1 and by the cover section 36.3.

[0072] Preferably, the deck section 36.3 is arranged parallel to the support surface 31 in order to achieve an improved discharge effect.

[0073] The side surfaces 36.1 of the ejector receptacle 36 can transition into the contour of the chisel receptacle 32 via transition sections.

[0074] Figure 3 illustrates that the extruder recording 36 starts from the one in Figure 4 the visible central longitudinal axis M of the chisel holder 32 is extended radially outwards.

[0075] How Figure 4As shown, the support body 35 has a support section 40 formed on the underside of the chisel holder 30. The support section 40 has two front cutting surfaces 41.1, 41.2. These front cutting surfaces 41.1, 41.2 are arranged on both sides of the central longitudinal plane of the chisel holder 30. Preferably, as illustrated in the drawings, the front cutting surfaces 41.1, 41.2 are each completely located on their respective side of the chisel holder 30, laterally adjacent to the central longitudinal plane, and do not penetrate the central longitudinal plane.

[0076] It is conceivable that the two front removal surfaces 41.1, 41.2 are connected to each other by means of a secondary surface 42. The secondary surface 42 penetrates the central longitudinal plane.

[0077] The front cutting surfaces 41.1, 41.2 enclose a transverse support angle α, as Figure 5This angle α is preferably in the range between 100° and 120°. The angle bisector of this angle α preferably lies in the central longitudinal plane.

[0078] As the drawings illustrate, a plug-in extension 44 is arranged on the underside of the chisel holder 30, preferably integrally formed. The front cutting surfaces 41.1, 41.2 are arranged at least partially in the feed direction in front of the plug-in extension 44. This illustrates Figure 4 .

[0079] The support section 40 further comprises at least one rear cutting surface 43.1, 43.2. In the illustrated embodiment, two rear cutting surfaces 43.1, 43.2 are used, which in this embodiment lie in one plane and are spaced apart from each other at least partially perpendicular to the central longitudinal plane. The two rear cutting surfaces 43.1, 43.2 are positioned at a longitudinal support angle to the front cutting surface 41.1, 41.2, each of which is assigned to one of the sides of the chisel holder 30.

[0080] Figure 2 shows that the front removal surfaces 41.1, 41.2 each transition via a sloping surface 42.1 into the rear removal surfaces 43.1, 43.2.

[0081] The inclined surfaces 42.1 may extend in the area between two transverse edges. The front transverse edge facing the front of the chisel holder 30 forms a transition between the front cutting surface 41.1, 41.2 and the inclined surface 42.1. The rear transverse edge facing the back of the chisel holder 30 forms a transition between the inclined surface 42.1 and the associated rear cutting surface 43.1, 43.2. The inclined surfaces 42.1 thus transition directly into the front cutting surfaces 41.1, 41.2 and the rear cutting surfaces 43.1, 43.2, respectively. However, an indirect transition is also conceivable, for example, by means of a rounded transition. According to the Figure 2It is possible that the inclined surfaces 42.1 form an obtuse angle with both the associated front cutting surface 41.1, 41.2 and the rear cutting surface 43.1, 43.2; it is particularly preferred that the inclined surfaces form the same angle with the front cutting surfaces 41.1, 41.2 and with the rear cutting surfaces 43.1, 43.2.

[0082] The plug-in connector 44 transitions into the support body 35 at its end facing the support body 35 via a shaft extension 44.1. The shaft extension 44.1 widens the cross-section of the plug-in connector 44 in the direction towards the support body 35 and radially to the plug-in connector's longitudinal axis 44.2, at least in certain areas. Preferably, the shaft extension 44.1 is formed circumferentially around the plug-in connector 44.

[0083] As the representations according to the Figures 4 As can be seen, the shaft widening 44.1 increases the cross-section of the plug socket 44.

[0084] To mount the chisel holder 30 to the base 10, the plug-in extension 44 is inserted with its free end into the plug-in receptacle 18. The insertion extension 18.1 facilitates the insertion of the plug-in extension 44.

[0085] The insertion movement of the plug-in end 44 into the plug-in receptacle 18 is limited by the front support surfaces 15.1, 15.2 and the rear support surfaces 16.1 and 16.2 of the lower part 10. The chisel holder 30 abuts these support surfaces 15.1, 15.2, 16.1, 16.2 with its front cutting surfaces 41.1, 41.2 and its rear cutting surfaces 43.1, 43.2.

[0086] The pressure screw 20 can be screwed into the screw receptacle 19 of the lower part 10. The pressure screw 20 then engages a screw pressure surface of a screw receptacle located on the rear of the plug-in extension 44. This draws the chisel holder 30 into the plug-in receptacle 18. The pressure screw 20 secures the chisel holder 30 in the lower part 10. In the assembled state, the shank extension 44.1 of the plug-in extension 44 is at least partially engaged in the insertion extension 18.1 of the lower part 10.

[0087] During machining, the machining forces are transferred from the tool holder 30 to the lower part 10. The force is transferred from the front cutting surfaces 41.1, 41.2 and the rear cutting surfaces 43.1, 43.2 of the tool holder 30 to the front support surfaces 15.1, 15.2 and the rear support surfaces 16.1, 16.2 of the lower part 10.

[0088] As the tool's usage time increases, the front cutting surfaces 41.1, 41.2 and the rear cutting surfaces 43.1, 43.2 and / or the front support surfaces 15.1, 15.2 and the rear support surfaces 16.1 and 16.2 may wear down. This causes the tool holder 30 to shift relative to the lower part 10. The use of the inclined surfaces 42.1, which face the lower part 10 in the area of ​​the recesses 17, provides a generous adjustment space (see Figure 2 ) created, which compensates for this wear. Thus, the chisel holder 30 can continue to be reliably and as intended supported on the front and rear support surfaces 15.1, 15.2, 16.1, 16.2 of the lower part 10.

[0089] As described above, adjacent tool systems can be connected to each other using filler elements 60. This is illustrated by the Figures 7 and 8 .

[0090] As the illustrations show, the tool systems are welded to the surface 52 of the milling drum 50 by means of their lower parts 10. For this purpose, weld seams 70 are applied in the transition area between the connection side 11 and the surface 52 of the milling drum tube 51. The weld seams 70 run along the sides of the lower parts 10.

[0091] The lower parts 10 are spaced apart from each other in the circumferential direction of the milling drum 50. A filling element 60 is arranged in the space between each pair of lower parts 10.

[0092] The design of the filler element 60 results from Figure 9As this illustration shows, the filler element 60 has a base body 60.1. The base body 60.1 has a lower contact surface 61. The contact surface 61 is preferably concave. The curvature of the contact surface 61 is preferably complementary to the curvature of the convex surface 52 of the milling drum tube 51.

[0093] However, it is also conceivable that the base body 60.1 has two or more spaced-apart support elements that rest on the surface 52 of the milling drum 50. Preferably, the filler element 60 is welded to the surface 52 of the milling drum 50 in the area of ​​these support elements. Particularly preferred are at least two support elements that project from the underside of the base body 60.1 opposite the projections 63, 68, and preferably the support elements extend over the entire width of the filler element 60 in the direction of the axis of rotation of the milling drum 50.

[0094] The base body 60.1 is bounded on its sides by side surfaces 64. When mounted on the milling drum 50, the side surfaces 64 extend substantially in the circumferential direction of the milling drum 50. Preferably, these side surfaces 64 are oriented radially or substantially radially to the axis of rotation of the milling drum tube 51, and in particular are arranged perpendicular to the surface 52.

[0095] In the transition area between the side surfaces 64 and the contact surface 61, base edges 61 are formed which are oriented in the circumferential direction of the milling drum 50.

[0096] How Figure 9 As illustrated, the filler element 60 has a front projection 65 in the region of its front surface 62. Preferably, a front boundary surface limits both the front surface of the base body 60.1 and the front surface of the projection 65. Preferably, this front boundary surface is designed as a flat surface, as shown. Figure 9illustrated.

[0097] The front projection 65 is integrally formed on the base body 60.1 and extends radially outwards beyond the base body 60.1.

[0098] In this context and in connection with the present patent application, "radial" does not mean that a component must be arranged exactly radially to the axis of rotation of the milling drum 50. Rather, it is intended to describe an essentially radial orientation.

[0099] The projection 65 is bounded at its radially outer end by a cover section 66. This cover section 66 forms a flat surface, preferably rectangular in shape, and has an extent in the direction of the axis of rotation of the milling drum 50 that is greater than the extent of the cover section 66 in the circumferential direction.

[0100] On its side facing the rear side 63 of the filling element 60, the projection 65 forms a rear transition section 69.3, which can be designed at least partially as a concave surface and form a rounded transition 69.5.

[0101] Evidentiously Figure 9 Preferably, the filler element 60 has a rear projection 67 in the region of its rear side 63. Preferably, a rear boundary surface bounds both the rear side of the base body 60.1 and the rear side of the projection 67. This rear boundary surface is preferably designed as a flat surface, as shown. Figure 9 illustrated.

[0102] The rear projection 67 is integrally formed on the base body 60.1 and extends radially outwards beyond the base body 60.1.

[0103] The projection 67 is bounded at its radially outer end by a cover section 68. This cover section 68 forms a flat surface, preferably rectangular in shape, and has an extent in the direction of the axis of rotation of the milling drum 50 that is greater than the extent of the cover section 66 in the circumferential direction.

[0104] On its side facing the front 62 of the filling element 50, the rear projection 67 forms a front transition section 69.1, which can be designed at least partially as a concave surface and form a rounded transition 69.4.

[0105] How Figure 9 As shown, the two approaches 65 and 67 are spaced apart from each other. Preferably, the rear transition section 69.3 and the front transition section 69.1 face each other.

[0106] Evidentiously Figure 9The base body 60.1 can have a finishing surface 69.2 on its upper surface opposite the mounting surface 61. Preferably, the finishing surface 69.2 of the base body 60.1 is concave and can have or form a recess 69. Preferably, the upper finishing surface 69.2 of the base body 60 is concave. It is conceivable that the upper finishing surface 69.2 is designed in the form of a rounded edge. To ensure a stable structure, this rounded edge is preferably designed with a radius of at least 10 mm. The rear transition section 69.3 and / or the front transition section 69.1 merge into the finishing surface 69.2 via the rounded transition 69.5, 69.4.

[0107] The filler element 60 has, in the region of the longitudinal ends of the side surfaces 64, two front transverse edges 62.1 in the region of the front 62 and two rear transverse edges 63.1 in the region of the rear 63. The transverse edges 62.1 and 63.1 preferably extend radially outwards over the region of the projections 65 and 67, as shown. Figure 9 illustrated.

[0108] Furthermore, it can be the case that... Figure 9 Figure 1 shows that the front projection 65 has a front longitudinal edge 66.1 in the area of ​​its cover section 66. Additionally or alternatively, the rear projection 67 may have a rear longitudinal edge 68.1 in the area of ​​its cover section 68. The longitudinal edges 66.1 and 68.1 extend in the direction of the axis of rotation of the milling drum 50.

[0109] Figure 7 This illustrates that the filling element 60, with its front side 62, rests against the back side 13.2 of the lower part 10 arranged in front of the respective filling element 60.

[0110] Furthermore, the filling element 60 rests against the front 13.1 of the adjacent lower part 10 in the area of ​​its rear side 63. Material-bonded connections, preferably welded connections, are used to fasten the filling element 60.

[0111] To attach the filling element 60 to the surface 52 of the milling drum tube 51, the weld seam 70 is formed in the area of ​​the base edge 61.1, preferably continuously.

[0112] To attach the filler element 60 to the front lower part 10, welds are formed in the area of ​​the front longitudinal edge 66.1 and the two front transverse edges 62.1 between the lower part 10 and the filler element 60. The welds in the area of ​​the front transverse edges 62.1 extend as far as possible to the deck section 66. The weld in the area of ​​the front longitudinal edge 66.1 preferably extends over the entire width of the deck section 66.

[0113] To attach the filler element 60 to the rear lower part 10, welds are formed in the area of ​​the rear longitudinal edge 68.1 and the two rear transverse edges 63.1 between the lower part 10 and the filler element 60. The welds in the area of ​​the rear transverse edges 63.1 extend as far as possible to the deck section 68. The weld in the area of ​​the rear longitudinal edge 66.1 preferably extends over the entire width of the deck section 68.

[0114] In Figure 10 A variant of a filler element 60 is shown in side view. The same reference numerals denote different embodiments compared to the embodiment shown in the illustration. Figure 9 The components are the same. Therefore, to avoid repetition, reference can be made to the above explanations. The following will therefore only address the differences of the exemplary embodiment according to... Figure 10 received.

[0115] How Figure 10As shown, the base body 60.1 has a convexly curved end surface 69.2 opposite its contact surface 61, which extends between the two projections 65, 67. The convex curvature increases the cross-section of the base body 60.1 in the area between the two projections 65, 67.

[0116] Evidentiously Figure 10 It is possible that the front projection 65 and / or the rear projection 67 transitions into the upper end surface 69.2 via a rounded transition 69.5, 69.4. It is also possible that at least one of the projections 65, 67 is connected to the base body 60.1 by a foot section.

[0117] A head section adjoins the foot section. A cross-sectional weakening, for example by means of the rounded transition 69.5, can be provided in the area of ​​the foot section, as shown. Figure 10This shows that the cross-section in the base area is smaller than the cross-section in the head area. Accordingly, the projection 65 in the base area has a lower section modulus against bending than the head area. If a load is applied to the projection 65 via the head area, elastic deformation of the projection 65 occurs in the base area.

[0118] Evidentiously Figure 10 The two deck sections 66, 68, which terminate the projections 65, 67, are each provided with a chamfer following the front longitudinal edge 66.1 and the rear longitudinal edge 68.1, respectively. This chamfer forms a weld preparation for receiving welding material.

[0119] As the foregoing explanations clarify, the invention relates to a milling drum 50 with a milling drum tube 51, wherein lower parts 10 of tool systems are attached to the surface 52 of the milling drum tube 51. At least some of the lower parts 10 are spaced apart from one another in the circumferential direction of the milling drum tube 51. In the spaced area thus obtained, the filler element 60 is arranged between at least some of the adjacent lower parts 10. This filler element 60 is welded to the lower part 10 located in front of and behind the filler element 60 in the circumferential direction of the drum and to the surface 52 of the milling drum tube 51. At least some of the filler elements 60 have the base body 60.1, onto which at least one radially outwardly projecting projection 65, 67 is formed. The projection 65, 67 is connected to the rear 13.2 of the circumferentially forward lower part 10 or to the front 13.1 of the rear lower part 10 is welded in the feed direction.

Claims

1. Milling drum (50) with a milling drum tube (51), in particular for a road milling machine, wherein lower parts (10) of tool systems are attached to the surface (52) of the milling drum tube (51), wherein at least a part of the lower parts (10) are spaced apart from each other in the circumferential direction of the milling drum tube (51), wherein in the space between at least a part of the circumferentially spaced lower parts (10) filler elements (60) are arranged, which are each welded to the lower part (10) arranged in the circumferential direction in front of and behind the filler element (60) in the circumferential direction of the drum and to the surface (52) of the milling drum tube (51), characterized by thatat least part of the filling elements (60) has a base body (60.1) to which at least one radially outwardly projecting projection (65, 67) is formed with respect to the axis of rotation of the milling drum (50), and that the projection (65, 67) is welded to the rear side (13.2) of the circumferentially forward lower part (10) or to the front side (13.1) of the feed-direction rear lower part (10).

2. Milling roller (50) according to claim 1, characterized by the fact that a front and a rear projection (65, 67) are formed on the base body (60.1), which are spaced apart from each other in the circumferential direction, and that the circumferentially front projection (65) is welded to the front lower part (10) and the rear projection (67) is welded to the rear lower part (10).

3. Milling roller (50) according to claim 2, characterized by the fact thatthe base body (60.1) is radially externally bounded by a termination surface (69.2), that the front projection (65) arranged circumferentially at the front of the base body (60.1) has a rear transition section (69.3), and that the rear transition section (69.3) and the termination surface (69.2) are transitioned into each other via a rounded transition (69.5) and / or that the rear projection (67) arranged circumferentially at the rear of the base body (60.1) has a front transition section (69.1), and that the front transition section (69.1) and the termination surface (69.2) are transitioned into each other via a rounded transition (69.4).

4. Milling roller (50) according to claim 3, characterized by the fact that the rear transition section (69.3) and the end surface (69.2) and / or the front transition section (69.1) and the end surface (69.2) are tangentially transitioned into each other.

5. Milling roller (50) according to one of claims 1 to 4, characterized by the fact thatthe end surface (69.2) is concave and / or convex in at least a partial area.

6. Milling roller (50) according to one of claims 1 to 5, characterized by the fact that the front and / or rear projection (65, 67) has a radially outer head region which is coupled to the base body (60.1) via a foot region, and that the projection (65, 67) in the foot region has a lower resistance moment against bending about an axis parallel to the axis of rotation of the milling drum (50) than the part of the head region of the front and / or rear projection (65, 67) adjoining the foot region.

7. Milling roller (50) according to one of claims 1 to 6, characterized by the fact thatthe front projection (65) has a front longitudinal edge (66.1) at its radially outer end region, wherein the front longitudinal edge (66.1) extends in the direction of the axis of rotation of the milling drum (50) and that the front longitudinal edge (66.1) is connected to the front lower part (10) by means of a weld, and / or that the rear projection (67) has a rear longitudinal edge (68.1) at its radially outer end region, wherein the rear longitudinal edge (68.1) extends in the direction of the axis of rotation of the milling drum (50) and that the rear longitudinal edge (68.1) is connected to the rear lower part (10) by means of a weld.

8. Milling roller (50) according to one of claims 1 to 7, characterized by the fact thatthe front projection (65) has front transverse edges (62.1) on its opposite sides, spaced apart from each other in the direction of the axis of rotation of the milling drum (50), and that the front transverse edges (62.1) are welded to the front lower part (10), and / or that the rear projection (67) has rear transverse edges (63.1) on its opposite sides, spaced apart from each other in the direction of the axis of rotation of the milling drum (50), and that the rear transverse edges (63.1) are welded to the rear lower part (10).

9. Milling drum (50) according to claim 8, wherein the distance of the front and / or the rear transverse edges (62.1, 63.1) in the direction of the axis of rotation of the milling drum (50) and in the connection area of ​​the filling element (60) to the surface (52) of the milling drum (50) is at least 0.4 times to 1.0 times the width of the associated lower part (10) in this direction and in the connection area of ​​the lower part (10) to the surface (52) of the milling drum (50).

10. Milling drum according to one of claims 1 to 9, characterized by the fact that at least one of the projections (65, 67) is limited on its side facing away from the milling drum (50) by a cover section (66, 68), and that the extent of the cover section in the circumferential direction of the milling drum (50) is at least 15 mm.

11. Milling roller (50) according to one of claims 1 to 10, characterized by the fact thatthe radial projection of the front projection (65) over the base part (60.1) is greater than the radial projection of the rear projection (67) over the base part (60.1).

12. Milling roller (50) according to one of claims 7 to 11, characterized by the fact that the front and / or the rear longitudinal edge (66.1 and / or 68.1) are arranged radially offset from the radially outer end of the projection (65, 67) to form a chamfer extending in the direction of rotation in the form of a weld preparation.

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