EP4071302A1 - Self-propelled ground milling machine - Google Patents
Self-propelled ground milling machine Download PDFInfo
- Publication number
- EP4071302A1 EP4071302A1 EP22163953.7A EP22163953A EP4071302A1 EP 4071302 A1 EP4071302 A1 EP 4071302A1 EP 22163953 A EP22163953 A EP 22163953A EP 4071302 A1 EP4071302 A1 EP 4071302A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- milling machine
- hydraulic
- crankshaft
- hydraulic tank
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000003801 milling Methods 0.000 title claims abstract description 104
- 238000002485 combustion reaction Methods 0.000 claims abstract description 32
- 239000003381 stabilizer Substances 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 8
- 230000001427 coherent effect Effects 0.000 claims description 5
- 230000008719 thickening Effects 0.000 claims description 4
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 241000380131 Ammophila arenaria Species 0.000 claims 1
- 239000003570 air Substances 0.000 description 38
- 238000012423 maintenance Methods 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000110 cooling liquid Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/08—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades
- E01C23/085—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades using power-driven tools, e.g. vibratory tools
- E01C23/088—Rotary tools, e.g. milling drums
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/065—Recycling in place or on the road, i.e. hot or cold reprocessing of paving in situ or on the traffic surface, with or without adding virgin material or lifting of salvaged material; Repairs or resurfacing involving at least partial reprocessing of the existing paving
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/12—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/12—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor
- E01C23/122—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with power-driven tools, e.g. oscillated hammer apparatus
- E01C23/127—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with power-driven tools, e.g. oscillated hammer apparatus rotary, e.g. rotary hammers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/10—Guiding or ducting cooling-air, to, or from, liquid-to-air heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/18—Arrangements or mounting of liquid-to-air heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/18—Arrangements or mounting of liquid-to-air heat-exchangers
- F01P2003/185—Arrangements or mounting of liquid-to-air heat-exchangers arranged in parallel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
- F01P2005/025—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers using two or more air pumps
Definitions
- the invention relates to a self-propelled ground milling machine, in particular a road cold milling machine, a stabilizer or a recycler.
- Generic ground milling machines in particular road cold milling machines, stabilizers or recyclers are, for example, from the DE102014008749A1 , DE102006062129A1 , DE102005044211A1 , EP1855899B1 and DE102014019168A1 known.
- Such ground milling machines are often used in road and path construction and for subsoil stabilization.
- Your working device is typically a milling device with, for example, a hollow-cylindrical milling drum that is equipped with a large number of milling tools on its outer lateral surface.
- the milling drum is arranged inside a milling drum box that is open towards the ground.
- the milling drum is set in rotation, usually about a horizontal axis of rotation running transversely to the forward direction of the ground milling machine, and is thereby lowered into the ground until a desired milling depth is reached.
- the soil milling machine then moves in the forward or working direction and continues to mill soil material.
- the ground to be processed or, for example, an asphalt surface of a road to be processed is broken up and crushed.
- the resulting milled material is conveyed, for example, via a discharge belt either in or against the working direction of the floor milling machine onto a transport vehicle and transported away by it.
- the floor milling machine usually includes a machine frame, which represents the main supporting structure of the floor milling machine. Furthermore, one or more front and rear travel devices are present, which can be connected to the machine frame via lifting devices, in particular lifting columns. All driving devices can be connected to the machine frame via lifting devices. To operate the ground milling machine, a control station is provided, which is usually arranged above the milling device.
- Such a self-propelled ground milling machine is driven in particular via a primary drive unit, in particular a diesel internal combustion engine.
- a primary drive unit in particular a diesel internal combustion engine.
- this often drives numerous other consumers, such as one or more hydraulic pumps for supplying hydraulic actuators, such as in particular traction motors, actuators for side plates, for example, a scraper blade, a hold-down device, a drive motor for a conveyor belt, a steering actuator, actuators for the positioning of a transport conveyor belt, lifting devices connecting the machine frame with driving devices, etc.
- hydraulic pumps for supplying hydraulic actuators, such as in particular traction motors, actuators for side plates, for example, a scraper blade, a hold-down device, a drive motor for a conveyor belt, a steering actuator, actuators for the positioning of a transport conveyor belt, lifting devices connecting the machine frame with driving devices, etc.
- the pump transfer case is often connected to the crankshaft of the primary drive unit, for example with a clutch being interposed.
- a floor milling machine of this type thus includes extensive components that are necessary for the operation of the floor milling machine and must be carried along with it. At the same time, it is desirable to make such a ground milling machine as compact as possible in order to be able to meet transport regulations more easily and to be able to offer the operator located on the operator's stand comparatively good visibility. With a compact design, ideally one or more of the aforementioned operating components should be easily accessible, ideally from outside the machine.
- the invention relates to a self-propelled ground milling machine, in particular a road cold milling machine, stabilizer or recycler, comprising a milling device for milling the subsoil in a milling depth, a machine frame supported by front and rear travel devices, a primary drive unit arranged on the machine frame, in particular an internal combustion engine, and a hydraulic system with at least two hydraulic pumps, a pump transfer case and a hydraulic tank.
- the ground milling machine also has a control station from which the self-propelled ground milling machine is operated.
- the hydraulic tank is arranged at least partially in a vertical extension of the pump distributor gear above the pump distributor gear.
- this means that the hydraulic tank is positioned so that it overlaps, viewed from the pump transfer case in the vertical direction.
- the advantage of this arrangement is that the hydraulic tank is positioned very close to the hydraulic pumps arranged on the pump transfer case and the hydraulic fluid required to supply the at least two hydraulic pumps is therefore stored in practically the immediate vicinity of the hydraulic pumps. In this way, the length of the connecting paths or the hydraulic hoses and/or pipelines required for the tubing between the hydraulic tank and the individual hydraulic pumps can be significantly reduced.
- the hydraulic tank is arranged essentially directly above the pump transfer case, particularly preferably only spatially separated by a part of a mounting frame, as explained in more detail below for a functional unit.
- the hydraulic tank and also the pump distributor gear regularly have a smaller extension in the vertical direction. This makes it possible to arrange the pump distributor gear and the hydraulic tank stacked on top of one another in the vertical direction, with the package of pump distributor gear and hydraulic tank then preferably having a maximum vertical extent which essentially corresponds to the maximum vertical extent of the primary drive unit, in particular including supply lines, or is even smaller is.
- the hydraulic tank is arranged completely in front of an engine block of the internal combustion engine in the axial direction of the crankshaft of the internal combustion engine, in particular on its main output side.
- the hydraulic tank extends in the axial direction of the crankshaft above the crankshaft over the preferably complete pump transfer case and/or over a clutch and/or a drive roller of a traction drive.
- the components mentioned are usually arranged in a row in the axial direction of the crankshaft and, overall, above them can represent an optimal accommodation space for the hydraulic tank with regard to the most compact overall structure possible.
- the hydraulic tank can be at the same height in the axial direction of the crankshaft as at least one air filter, preferably at least two air filters, particularly one air filter each on both sides of the hydraulic tank.
- the two air filters are ideally followed by a particularly V-shaped air merging system running towards the internal combustion engine.
- the at least one air filter can be arranged relatively high in terms of its intake opening and at the same time relatively close to the primary drive unit in the ground milling machine.
- the hydraulic tank is preferably arranged in the axial direction of the crankshaft at the level of several hydraulic pumps, in particular several tandem arrangements of hydraulic pumps.
- at least two hydraulic pumps are connected in series in the axial direction one behind the other on a common connecting flange to the pump transfer case.
- the hydraulic tank is now preferably designed in such a way that it extends at least partially, preferably completely, in the axial direction of the crankshaft over at least one, in particular several and very particularly over all hydraulic pumps flanged to the pump transfer case.
- the hydraulic tank extends in the axial direction of the crankshaft completely above and, in relation to a virtual horizontal projection plane, within a drive train arranged in succession in the axial direction, comprising, preferably in this order, a clutch flanged to the internal combustion engine, a pump transfer case , a clutch and a drive roller of a traction mechanism.
- These components can all be designed and arranged with a relatively small vertical height radially to the axial direction of the axis of rotation of the crankshaft, so that a sufficiently large and at the same time compact accommodation compartment for accommodating the hydraulic tank can be obtained.
- Optimized arrangements of the hydraulic tank relative to other components are also possible with regard to the arrangement of individual components in a plan view of the axis of rotation of the crankshaft.
- a V-shaped arrangement has proven to be particularly optimal.
- provision can be made in particular for the axis of rotation of the crankshaft, at least two hydraulic pumps lying opposite one another as seen in the forward direction of the floor milling machine, and at least two air filters lying opposite one another to be arranged essentially in a V-shape, as seen in the axial direction of the crankshaft, with in particular in the two V-legs starting from the base point of the V-shaped arrangement formed by the axis of rotation of the crankshaft, there is in each case a hydraulic pump and in each case an air filter positioned above it in the vertical direction.
- the two V-legs open up a free space in between, which is ideal for accommodating the hydraulic tank, especially in the middle.
- An outstanding advantage of this specific arrangement lies in the fact that hydraulic pumps are positioned in the vertical direction below the hydraulic tank on both sides, horizontally offset to the axis of rotation of the crankshaft and in this way on the one hand a comparatively large number of hydraulic pumps with extremely short connection paths from the hydraulic tank to the individual hydraulic pumps is possible. In this level, the hydraulic tank sits directly above and in the middle of the pumps.
- a further preferred development of the invention consists in that at least one air filter is arranged in front of and/or behind and/or next to the hydraulic tank in the longitudinal direction of the ground milling machine and/or horizontally and transversely to the axis of rotation of the crankshaft, the at least one air filter being in particular in a vertical extension a hydraulic pump arranged on the pump transfer case.
- the air filter or filters are therefore ideally positioned at least partially in the vertical direction in the area of the hydraulic tank.
- the hydraulic tank, at least two air filters, the pump transfer case and at least two hydraulic pumps can be arranged essentially symmetrically to one another, in particular simultaneously in a V-shape, in particular in relation to a mirror plane running vertically and along the axis of rotation of the crankshaft .
- at least two hydraulic pumps arranged on the pump transfer case, at least one air filter positioned next to the hydraulic tank and the hydraulic tank can also be arranged above the axis of rotation of the crankshaft in relation to a horizontal reference plane.
- the hydraulic tank is preferably mirror-symmetrical with respect to a vertical reference plane running along the axis of rotation of the crankshaft. This can make assembly easier.
- a functional unit or a coherent construction module comprising the hydraulic tank, the pump transfer case and at least two hydraulic pumps as well as at least one air filter and preferably additionally at least one of the elements “coupling between the internal combustion engine and pump transfer case” and/or “Shifting clutch between pump transfer case and a traction drive roller” and/or “another air filter with air ducting to the combustion engine”, which is designed as a coherent preassembled assembly that can be moved separately from the combustion engine or can be mounted on it as a coherent assembly, in particular comprising a mounting frame that is independent of the machine frame.
- the functional unit is to be understood in particular in the structural sense to the effect that this entirety is designed to be removable from the ground milling machine as a whole.
- the assembly frame describes an inherently rigid support structure that allows the individual components mentioned to be preassembled and/or interchangeable in a stationary relative position to one another independently of the machine frame.
- the functional unit is thus preferably designed in such a way that it can be removed as a whole from the ground milling machine and, in particular, has at least one separate connection device for System or intervention for an external lifting device.
- a lifting device can be, for example, a forklift that lifts the functional unit or a crane device that pulls up the functional unit. This can facilitate the transport and/or the installation and removal of the functional unit on the ground milling machine.
- a connection device for example designed in one piece with the mounting frame, is also present as part of the functional unit.
- connection device is positioned and designed on the functional unit in such a way that the functional unit is essentially balanced in contact with the lifting device, in particular simultaneously when it is filled with operating fluids and when it is empty with regard to the operating fluids.
- the machine frame can have a bearing mount for mounting the internal combustion engine and/or the functional unit and/or the pump transfer case. It is then preferred if the machine frame in the axial extension of the crankshaft away from the primary drive unit comprises a frame recess, in particular a frame tapering such that the upper side of the machine frame extends in the vertical direction below the internal combustion engine and/or the functional unit and/or the pump transfer case and/or the Clutch, in particular a clutch cover or clutch bell of the clutch, is lowered or deepened.
- the frame recess facilitates assembly and maintenance work, since one or more of the aforementioned components can be moved or removed in the axial direction of the crankshaft across the frame through the frame recess in the axial direction.
- the frame depression does not create a weak point in the machine frame at the same time.
- the frame recess is formed on the upper side of the machine frame in the horizontal extension of the crankshaft in such a way that the machine frame is formed with a substantially constant cross-sectional profile in this area which is temporarily drawn downwards.
- the frame recess forms a frame projection on the opposite underside of the machine frame.
- the machine frame in the area of the frame recess in particular the frame narrowing, can also be designed in such a way that the underside runs horizontally in a straight line at the same height as the area of the machine frame adjoining the frame recess, in particular on both sides, and/or the machine frame has additional stabilization in the area of the frame recess, in particular thickening of the material.
- the additional application of material in the area of the frame depression preferably leads to a transitional and vertical direction along the longitudinal extension of the machine frame. and decreasing material thickness of the machine frame and thus compensates for structural weaknesses associated with the deepening in this area.
- a floor milling machine of the generic type has a cooling air duct with at least one of the features described in more detail below.
- Significant heating phenomena can occur during use of such ground milling machines, for example naturally on the internal combustion engine, in the hydraulic oil circuit, etc.
- Ground milling machines therefore typically include a cooling system with an engine cooling device and a hydraulic fluid cooling device.
- the engine cooling device can have a first fan and a cooling circuit with an engine heat exchanger.
- a cooling liquid, for example, is circulated in this cooling circuit, via which the internal combustion engine can be cooled during operation. The heat absorbed by the cooling liquid is given off to the air at the heat exchanger.
- the hydraulic fluid cooling device can be set up in such a way that it enables the hydraulic fluid that heats up during operation to be cooled, again often also with the aid of a heat exchanger and a fan assigned to it.
- One or more cooling air ducts can be present for cooling, which are designed in such a way that ambient air is sucked in from the outside environment by one or more fans and fed to the respective heat exchanger. The cooling air can also be sucked through an engine compartment.
- the invention preferably provides for at least one suction fan to be present in the rear area of the floor milling machine, which is arranged in such a way that it blows heated cooling air out of the floor milling machine in an oblique direction upwards and backwards.
- the heated cooling air is blown out in the rear area counter to the direction of travel, specifically diagonally upwards counter to the direction of travel.
- figure 1 shows a ground milling machine 1 of the road cold milling machine type (central rotor milling machine) with a driver's platform 2 and a machine frame or chassis 3.
- the ground milling machine 1 is self-propelled and has driving devices 6 for this purpose, for example chain drives or wheels.
- driving devices 6 for this purpose, for example chain drives or wheels.
- the ground milling machine 1 moves in the working direction a over the ground 7 to be processed.
- the ground milling machine 1 mills the ground 7 to a milling depth with a milling drum 9 mounted in a milling drum box 8 so that it can rotate about the axis of rotation 10 on a milling device 20.
- the removed milled material can, for example, be loaded onto a transport vehicle (not shown) and transported away by it via a discharge device 5, for example a transport conveyor belt, in the working direction a.
- the floor milling machine 1 includes a drive train 13.
- a cooling air supply is provided as part of a cooling system, which is designed in such a way that supply air 11 is supplied on the top of the floor milling machine 1 in a working direction a lying behind the control stand 2 of the ground milling machine 1 sucks.
- the exhaust air 12 is blown out at the rear of the ground milling machine 1 arranged exhaust air openings against the working direction a to the rear and obliquely upwards (for example through corresponding guide vanes in the outlet area).
- FIG. 2 An exemplary drive train 13 of the ground milling machine 1, in particular for a road cold milling machine, is shown in figure 2 shown roughly schematically. It comprises an internal combustion engine 14 as the primary drive unit, for example a diesel engine, the crankshaft of which rotates about the axis of rotation D. The crankshaft can be connected to a clutch 15 . A pump transfer case 16 can be connected to the clutch in the axial direction of the axis of rotation. A plurality of units 18, such as in particular one or more hydraulic pumps, also in a tandem arrangement, of a hydraulic system can be flanged onto distributor shafts of the pump distributor gear 16 and driven by the latter.
- an internal combustion engine 14 as the primary drive unit, for example a diesel engine, the crankshaft of which rotates about the axis of rotation D.
- the crankshaft can be connected to a clutch 15 .
- a pump transfer case 16 can be connected to the clutch in the axial direction of the axis of rotation.
- the hydraulic system can, for example, be designed in such a way that hydraulic motors are driven via hydraulic pumps, which are used, for example, to drive the running gear 6 or to drive the conveying device 5 of the ground milling machine 1 .
- Other actuators such as linear actuators, can also be supplied with hydraulic drive energy in this way, for example for blade control of the milling device 20, for adjusting the conveyor device 5, etc.
- All the hydraulic pumps required for the ground milling machine 1 can be coupled to the pump distributor gear 16 and supplied with energy by it.
- a clutch 19 in the axial Direction of the axis of rotation which connect, which in turn is in drive connection with a drive roller 21 of a traction mechanism 22 driving the milling drum 9 .
- the axis of rotation D can run parallel to the axis of rotation 10 of the milling drum and thus horizontally and perpendicularly to the forward direction A.
- a hydraulic tank 23 which, as in figure 2 shown above the pump transfer case 16 and in the direction of the axis of rotation which is arranged between the internal combustion engine and the traction mechanism 22.
- the arrangement can also have two air filters 26 which are arranged at the level of the hydraulic tank 23 in front of and behind the hydraulic tank 23 as seen in the forward direction A.
- feed lines 27 lead from the air filters 26, which according to the plan view figure 2 converge to form a common air supply line 28 at the level of the internal combustion engine.
- FIG. 2 makes it clear that the hydraulic tank 23 extends with respect to its extent in the direction of the axis of rotation via the clutch 15, the pump transfer case 16 and the clutch 19. Furthermore, in a vertical top view, the hydraulic tank overlaps pumps 18, in particular all of the hydraulic pumps 18 connected to the pump transfer case 16.
- the Figures 3 and 4 show a concrete design of the in figure 2 schematically indicated functional components of the drive system of the ground milling machine 1.
- the pumps 18 are arranged on the right and left above the crankshaft and an air filter 26 is arranged above them.
- the hydraulic tank 23 is arranged in the vertical direction above that of the pump transfer case 16 and the shifting clutch 19 in the free space between the two V-legs of this arrangement projecting from the axis of rotation D.
- the hydraulic tank 23 does not protrude in the vertical direction from the internal combustion engine 14 including the supply lines.
- figure 4 makes it clear that the functional unit 28 consisting of clutch 15, pump transfer case 16, clutch 19, traction roller 21, hydraulic tank 23 and air filters 26 is almost flush with the side boundary of the in figure 4 indicated machine frame 3 and even partially protrudes in this direction along the axis of rotation over the machine frame 3 in the axial direction. This makes possible optimal access to these components from outside the machine despite the overall compact arrangement.
- the Figures 3 and 4 also illustrate the combination of the clutch 15, the pump distributor gear 16, the clutch 19, the traction pulley 21, the pumps 18, the air filter 26 and the hydraulic tank 23 to form a coherent functional unit 28 which, in particular via the clutch 15, can be flanged to the primary drive unit can.
- This functional unit 28 or this functional module comprises an assembly frame 29 which, in particular in conjunction with the individual components, represents a supporting structure separate from the machine frame 3 and which enables the functional unit 28 to be pre-assembled.
- the functional unit 28 can be replaced relatively easily as a whole on the ground milling machine 1 in this way.
- the functional unit 28 includes strap-like connection devices 30, which in the present case can be formed by the mounting frame 29 or, for example, a housing of the pump distributor gear to 16.
- a recess 31 shows an axial extension of the axis of rotation D in the machine frame 3.
- the upper side of the machine frame 3 seen in the forward direction A is level with the clutch 15, the pump distributor gear 16 and/or the shift clutch 19 in the vertical direction V offset below that it is seen in the axial direction of the axis of rotation D overlap freely with these components.
- the recess 31 is preferably lowered to such an extent that a free space is obtained in the vertical direction between the upper side of the machine frame 3 in this area and these components. This also makes it easier to access this part of the drive train from the outside.
- a clutch bell of the clutch 19 can be easily pulled off along the axis of rotation without colliding with the machine frame 3 .
- the machine frame 3 thus has a material taper in the vertical direction in this area, there are additional material thickenings 32 which span the depression 31 in the longitudinal direction of the machine frame 3 .
- the extent of the thickening of the material in 32 essentially correlates to the respective extent of the recess 31 over the course of the recess 31 in the longitudinal extent of the machine frame 3, so that overall a constant carrying capacity across the recess is ensured.
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Abstract
Selbstfahrende Bodenfräsmaschine, insbesondere Straßenkaltfräse, Stabilisierer oder Recycler, umfassend eine Fräseinrichtung zum Auffräsen des Bodenuntergrundes in einer Frästiefe, einen von vorderen und hinteren Fahreinrichtungen getragenen Maschinenrahmen, einen in einem Motorraum angeordneten Verbrennungsmotor, ein Hydrauliksystem mit wenigstens zwei Hydraulikpumpen, einem Pumpenverteilergetriebe und einem Hydrauliktank, und einen Fahrstand, wobei der Hydrauliktank wenigstens teilweise in vertikaler Verlängerung des Pumpenverteilergetriebes oberhalb des Pumpenverteilergetriebes angeordnet ist.Self-propelled ground milling machine, in particular road cold milling machine, stabilizer or recycler, comprising a milling device for milling the ground in a milling depth, a machine frame carried by front and rear driving devices, an internal combustion engine arranged in an engine compartment, a hydraulic system with at least two hydraulic pumps, a pump distributor gear and a hydraulic tank, and a driver's station, wherein the hydraulic tank is arranged at least partially in a vertical extension of the pump transfer case above the pump transfer case.
Description
Die Erfindung betrifft eine selbstfahrende Bodenfräsmaschine, insbesondere eine Straßenkaltfräse, einen Stabilisierer oder einen Recycler.The invention relates to a self-propelled ground milling machine, in particular a road cold milling machine, a stabilizer or a recycler.
Gattungsgemäße Bodenfräsmaschinen, insbesondere Straßenkaltfräsen, Stabilisierer oder Recycler, sind beispielsweise aus der aus der
Vom Grundaufbau her umfasst die Bodenfräsmaschine üblicherweise einen Maschinenrahmen, der die wesentliche Tragstruktur der Bodenfräsmaschine darstellt. Ferner sind ein oder mehrere vordere und hintere Fahreinrichtungen vorhanden, die über Hubeinrichtungen, insbesondere Hubsäulen, mit dem Maschinenrahmen verbunden sein können. Es können alle Fahreinrichtungen mit dem Maschinenrahmen über Hubeinrichtungen verbunden sein. Zur Bedienung der Bodenfräsmaschine ist ein Fahrstand vorgesehen, der üblicherweise über der Fräseinrichtung angeordnet ist.In terms of the basic structure, the floor milling machine usually includes a machine frame, which represents the main supporting structure of the floor milling machine. Furthermore, one or more front and rear travel devices are present, which can be connected to the machine frame via lifting devices, in particular lifting columns. All driving devices can be connected to the machine frame via lifting devices. To operate the ground milling machine, a control station is provided, which is usually arranged above the milling device.
Der Antrieb einer solchen selbstfahrenden Bodenfräsmaschine erfolgt insbesondere über ein Primärantriebsaggregat, insbesondere einen Dieselverbrennungsmotor. Dieser treibt neben einem Antriebsstrang für die Fräswalze häufig zahlreiche andere Verbraucher an, wie beispielsweise eine oder mehrere Hydraulikpumpen zur Versorgung hydraulischer Aktoren, wie insbesondere Fahrmotoren, Stellglieder für beispielsweise Seitenschilde, ein Abstreifschild, einen Niederhalter, einen Antriebsmotor für ein Transportförderband, einen Lenkaktor, Stellglieder für die Positionierung eines Transportförderbandes, den Maschinenrahmen mit Fahreinrichtungen verbindende Hubeinrichtungen etc. Es ist bekannt, bei Bodenfräsmaschine mehrere Hydraulikpumpen an einem Pumpenverteilergetriebe anzuordnen. Das Pumpenverteilergetriebe schließt sich häufig, beispielsweise unter Zwischenschaltung einer Kupplung, an die Kurbelwelle des Primärantriebsaggregates an. Ferner ist es bekannt, im Antriebstrang zur Fräswalze hin, insbesondere in Kraftübertragungsrichtung vor einem Zugmittelgetriebe, eine Schaltkupplung anzuordnen, mit der die Übertragung verschiedener Drehzahlen und/oder die wahlweise Unterbrechung der Antriebsverbindung ermöglicht wird. Um das Primärantriebsaggregat mit Verbrennungsluft zu versorgen, ist ferner die Nutzung wenigstens eines Luftfilters mit entsprechender Verbrennungsluftführung hin zum Primärantriebsaggregat üblich. Gattungsgemäße Bodenfräsmaschinen umfassen somit häufig ein umfangreiches Hydrauliksystem. Zur Versorgung der einzelnen hydraulischen Verbraucher ist in der Regel zur Bevorratung und Sammlung von Hydraulikfluid ein Hydrauliktank an der Bodenfräsmaschine vorgesehen.Such a self-propelled ground milling machine is driven in particular via a primary drive unit, in particular a diesel internal combustion engine. In addition to a drive train for the milling drum, this often drives numerous other consumers, such as one or more hydraulic pumps for supplying hydraulic actuators, such as in particular traction motors, actuators for side plates, for example, a scraper blade, a hold-down device, a drive motor for a conveyor belt, a steering actuator, actuators for the positioning of a transport conveyor belt, lifting devices connecting the machine frame with driving devices, etc. It is known to arrange several hydraulic pumps on a pump distributor gear in ground milling machines. The pump transfer case is often connected to the crankshaft of the primary drive unit, for example with a clutch being interposed. It is also known to arrange a clutch in the drive train to the milling drum, in particular in front of a traction mechanism in the direction of power transmission, with which the transmission of different speeds and/or the optional interruption of the drive connection is made possible. In order to supply the primary drive assembly with combustion air, it is also common to use at least one air filter with a corresponding combustion air duct to the primary drive assembly. Generic ground milling machines thus often include an extensive hydraulic system. To supply the individual hydraulic consumers, a hydraulic tank is generally provided on the ground milling machine for storing and collecting hydraulic fluid.
Eine gattungsgemäße Bodenfräsmaschine umfasst somit umfangreiche Komponenten, die zum Betrieb der Bodenfräsmaschine erforderlich sind und mit dieser mitgeführt werden müssen. Gleichzeitig ist es wünschenswert, eine solche Bodenfräsmaschine so kompakt wie möglich auszubilden, um einerseits Transportregularien leichter erfüllen zu können und andererseits dem auf dem Fahrstand befindlichen Bediener vergleichsweise gute Sichtverhältnisse bieten zu können. Bei kompakter Bauart soll gleichzeitig im Idealfall eine gute Zugänglichkeit einer oder mehrerer der vorstehend genannten Betriebskomponenten, im besten Fall von außerhalb der Maschine, möglich sein.A floor milling machine of this type thus includes extensive components that are necessary for the operation of the floor milling machine and must be carried along with it. At the same time, it is desirable to make such a ground milling machine as compact as possible in order to be able to meet transport regulations more easily and to be able to offer the operator located on the operator's stand comparatively good visibility. With a compact design, ideally one or more of the aforementioned operating components should be easily accessible, ideally from outside the machine.
Hiervon ausgehend ist es die Aufgabe der Erfindung, eine Möglichkeit zur Unterbringung verschiedener Betriebskomponenten der Bodenfräsmaschine in möglichst kompakter Weise anzugeben, wobei gleichzeitig einzelne oder mehrere dieser Komponenten zu Wartungsarbeiten idealerweise gut zugänglich sein sollen.Proceeding from this, it is the object of the invention to provide a way of accommodating various operating components of the ground milling machine in the most compact manner possible, while at the same time one or more of these components should ideally be easily accessible for maintenance work.
Die Lösung der Aufgabe gelingt mit einer selbstfahrenden Bodenfräsmaschine, insbesondere Straßenkaltfräse, Stabilisierer oder Recycler, gemäß dem unabhängigen Anspruch. Bevorzugte Weiterbildungen sind in den abhängigen Ansprüchen angegeben.The task is solved with a self-propelled ground milling machine, in particular a road cold milling machine, stabilizer or recycler, according to the independent claim. Preferred developments are specified in the dependent claims.
Die Erfindung betrifft eine selbstfahrende Bodenfräsmaschine, insbesondere Straßenkaltfräse, Stabilisierer oder Recycler, umfassend eine Fräseinrichtung zum Auffräsen des Bodenuntergrundes in einer Frästiefe, einen von vorderen und hinteren Fahreinrichtungen getragenen Maschinenrahmen, ein am Maschinenrahmen angeordnetes Primärantriebsaggregat, insbesondere ein Verbrennungsmotor, und ein Hydrauliksystem mit wenigstens zwei Hydraulikpumpen, einem Pumpenverteilergetriebe und einem Hydrauliktank. Die Bodenfräsmaschine weist ferner einen Fahrstand auf, von dem aus die Bedienung der selbstfahrenden Bodenfräsmaschine erfolgt.The invention relates to a self-propelled ground milling machine, in particular a road cold milling machine, stabilizer or recycler, comprising a milling device for milling the subsoil in a milling depth, a machine frame supported by front and rear travel devices, a primary drive unit arranged on the machine frame, in particular an internal combustion engine, and a hydraulic system with at least two hydraulic pumps, a pump transfer case and a hydraulic tank. The ground milling machine also has a control station from which the self-propelled ground milling machine is operated.
Es ist erfindungsgemäß vorgesehen, dass der Hydrauliktank wenigstens teilweise in vertikaler Verlängerung des Pumpenverteilergetriebes oberhalb des Pumpenverteilergetriebes angeordnet ist. Dies bedeutet in anderen Worten, dass der Hydrauliktank vom Pumpenverteilergetriebe aus in vertikaler Richtung gesehen dieses überlappend positioniert ist. Der Vorteil dieser Anordnung liegt darin, dass der Hydrauliktank räumlich sehr nah zu den am Pumpenverteilergetriebe angeordneten Hydraulikpumpen positioniert ist und damit das für die Versorgung der wenigstens zwei Hydraulikpumpen benötigte Hydraulikfluid in praktisch unmittelbarer Nähe zu den Hydraulikpumpen bevorratet ist. Auf diese Weise kann die Länge der Verbindungswege beziehungsweise der für die Verschlauchung erforderlichen Hydraulikschläuche und/oder Rohrleitungen zwischen dem Hydrauliktank und den einzelnen Hydraulikpumpen deutlich reduziert werden. Bevorzugt ist es vorgesehen, dass der Hydrauliktank im Wesentlichen unmittelbar oberhalb des Pumpenverteilergetriebes angeordnet ist, besonders bevorzugt lediglich räumlich getrennt durch einen Teil eines Montagerahmens, wie nachstehend zu einer Funktionseinheit noch näher dargestellt. Gegenüber dem Primärantriebsaggregat weisen ferner der Hydrauliktank und auch das Pumpenverteilergetriebe regelmäßig eine geringere Erstreckung in vertikaler Richtung auf. Dadurch ist es möglich, das Pumpverteilergetriebe und den Hydrauliktank in vertikaler Richtung gestapelt aufeinander anzuordnen, wobei das Paket aus Pumpenverteilergetriebe und Hydrauliktank dann vorzugsweise eine maximale vertikale Erstreckung aufweist, die im wesentlichen der maximalen vertikalen Erstreckung des Primärantriebsaggregates, insbesondere inklusive Versorgungsleitungen, entspricht oder sogar kleiner ist.It is provided according to the invention that the hydraulic tank is arranged at least partially in a vertical extension of the pump distributor gear above the pump distributor gear. In other words, this means that the hydraulic tank is positioned so that it overlaps, viewed from the pump transfer case in the vertical direction. The advantage of this arrangement is that the hydraulic tank is positioned very close to the hydraulic pumps arranged on the pump transfer case and the hydraulic fluid required to supply the at least two hydraulic pumps is therefore stored in practically the immediate vicinity of the hydraulic pumps. In this way, the length of the connecting paths or the hydraulic hoses and/or pipelines required for the tubing between the hydraulic tank and the individual hydraulic pumps can be significantly reduced. It is preferably provided that the hydraulic tank is arranged essentially directly above the pump transfer case, particularly preferably only spatially separated by a part of a mounting frame, as explained in more detail below for a functional unit. Furthermore, compared to the primary drive unit, the hydraulic tank and also the pump distributor gear regularly have a smaller extension in the vertical direction. This makes it possible to arrange the pump distributor gear and the hydraulic tank stacked on top of one another in the vertical direction, with the package of pump distributor gear and hydraulic tank then preferably having a maximum vertical extent which essentially corresponds to the maximum vertical extent of the primary drive unit, in particular including supply lines, or is even smaller is.
Hinsichtlich der konkreten Anordnung des Hydrauliktanks sind weiter bevorzugte Anordnungsalternativen, in alternativer und auch in ergänzender Kombination zueinander, möglich. Vorteilhaft ist es beispielsweise, wenn der Hydrauliktank in Axialrichtung der Kurbelwelle des Verbrennungsmotors, insbesondere auf dessen Hauptabtriebsseite, vollständig vor einem Motorblock des Verbrennungsmotors angeordnet ist. Weiter ergänzend oder alternativ kann es vorgesehen sein, dass sich der Hydrauliktank in Axialrichtung der Kurbelwelle oberhalb der Kurbelwelle über das, vorzugsweise komplette, Pumpenverteilergetriebe hinweg, und/oder über eine Schaltkupplung und/oder eine Antriebsrolle eines Zugmittelgetriebes erstreckt. Die genannten Komponenten sind üblicherweise in axialer Richtung der Kurbelwelle aneinandergereiht angeordnet und können insgesamt oberhalb von ihnen einen hinsichtlich eines möglichst kompakten Gesamtaufbaus optimalen Aufnahmeraum für den Hydrauliktank darstellen. Weiter ergänzend oder alternativ kann der Hydrauliktank in Axialrichtung der Kurbelwelle auf gleicher Höhe mit wenigstens einem Luftfilter, bevorzugt wenigstens zwei Luftfiltern, ganz besonders jeweils einem Luftfilter beidseits des Hydrauliktanks, angeordnet sein. In diesem Fall schließt sich an die beiden Luftfilter idealerweise eine zum Verbrennungsmotor hin verlaufende, insbesondere V-förmige, Luftzusammenführung an. Auf diese Weise kann der wenigstens eine Luftfilter hinsichtlich seiner Ansaugöffnung vergleichsweise hochliegend und gleichzeitig verhältnismäßig nah am Primärantriebsaggregat in der Bodenfräsmaschine angeordnet werden.With regard to the specific arrangement of the hydraulic tank, further preferred arrangement alternatives are possible, in an alternative and also in a supplementary combination to one another. It is advantageous, for example, if the hydraulic tank is arranged completely in front of an engine block of the internal combustion engine in the axial direction of the crankshaft of the internal combustion engine, in particular on its main output side. In addition or as an alternative, it can be provided that the hydraulic tank extends in the axial direction of the crankshaft above the crankshaft over the preferably complete pump transfer case and/or over a clutch and/or a drive roller of a traction drive. The components mentioned are usually arranged in a row in the axial direction of the crankshaft and, overall, above them can represent an optimal accommodation space for the hydraulic tank with regard to the most compact overall structure possible. In addition or as an alternative, the hydraulic tank can be at the same height in the axial direction of the crankshaft as at least one air filter, preferably at least two air filters, particularly one air filter each on both sides of the hydraulic tank. In this case, the two air filters are ideally followed by a particularly V-shaped air merging system running towards the internal combustion engine. In this way, the at least one air filter can be arranged relatively high in terms of its intake opening and at the same time relatively close to the primary drive unit in the ground milling machine.
Der Hydrauliktank ist bevorzugt in Axialrichtung der Kurbelwelle auf Höhe mehrerer Hydraulikpumpen, insbesondere mehrerer Tandemanordnungen von Hydraulikpumpen, angeordnet. Bei einer Tandemanordnung sind wenigstens zwei Hydraulikpumpen in axialer Richtung hintereinander in Serie auf einem gemeinsamen Anschlussflansch an das Pumpenverteilergetriebe angeschlossen. Der Hydrauliktank ist nun bevorzugt derart gestaltet, dass er sich in axialer Richtung der Kurbelwelle über wenigstens eine, insbesondere mehrere und ganz besonders über alle am Pumpenverteilergetriebe angeflanschten Hydraulikpumpen wenigstens teilweise, vorzugsweise vollständig, erstreckt.The hydraulic tank is preferably arranged in the axial direction of the crankshaft at the level of several hydraulic pumps, in particular several tandem arrangements of hydraulic pumps. In a tandem arrangement, at least two hydraulic pumps are connected in series in the axial direction one behind the other on a common connecting flange to the pump transfer case. The hydraulic tank is now preferably designed in such a way that it extends at least partially, preferably completely, in the axial direction of the crankshaft over at least one, in particular several and very particularly over all hydraulic pumps flanged to the pump transfer case.
Es kann auch vorteilhaft sein, wenn sich der Hydrauliktank in Axialrichtung der Kurbelwelle vollständig oberhalb und, in Bezug auf eine virtuelle horizontale Projektionsebene, innerhalb eines in Axialrichtung aufeinanderfolgend angeordneten Antriebsstrangs erstreckt, umfassend, bevorzugt in dieser Reihenfolge, eine am Verbrennungsmotor angeflanschte Kupplung, ein Pumpenverteilergetriebe, eine Schaltkupplung und eine Antriebsrolle eines Zugmittelgetriebes. Diese Komponenten können allesamt mit einer radial zur axialen Richtung der Drehachse der Kurbelwelle vergleichsweise geringen vertikalen Bauhöhe ausgestaltet und angeordnet werden, sodass hierdurch ein ausreichend großes und gleichzeitig kompaktes Aufnahmekompartiment zur Unterbringung des Hydrauliktanks erhalten werden kann.It can also be advantageous if the hydraulic tank extends in the axial direction of the crankshaft completely above and, in relation to a virtual horizontal projection plane, within a drive train arranged in succession in the axial direction, comprising, preferably in this order, a clutch flanged to the internal combustion engine, a pump transfer case , a clutch and a drive roller of a traction mechanism. These components can all be designed and arranged with a relatively small vertical height radially to the axial direction of the axis of rotation of the crankshaft, so that a sufficiently large and at the same time compact accommodation compartment for accommodating the hydraulic tank can be obtained.
Auch hinsichtlich der Anordnung einzelner Komponenten bei einer Draufsicht auf die Drehachse der Kurbelwelle sind optimierte Anordnungen des Hydrauliktanks relativ zu weiteren Komponenten möglich. In diesem Zusammenhang hat sich insbesondere eine V-förmige Anordnung als besonders optimal herausgestellt. Dazu kann es insbesondere vorgesehen sein, dass die Drehachse der Kurbelwelle, wenigstens zwei in Vorwärtsrichtung der Bodenfräsmaschine gesehen einander gegenüberliegende Hydraulikpumpen und wenigstens zwei einander gegenüberliegende Luftfilter in Axialrichtung der Kurbelwelle gesehen im Wesentlichen V-förmig angeordnet sind, wobei insbesondere in den beiden V-Schenkeln vom durch die Drehachse der Kurbelwelle gebildeten Fußpunkt der V-förmigen Anordnung ausgehend jeweils eine Hydraulikpumpe und jeweils ein in Vertikalrichtung darüber positionierter Luftfilter vorhanden sind. Die beiden V-Schenkel spannen einen dazwischen liegenden Freiraum auf, der optimal zur, insbesondere mittigen, Aufnahme des Hydrauliktanks ist. Ein herausragender Vorteil dieser konkreten Anordnung liegt insbesondere darin, dass Hydraulikpumpen in vertikaler Richtung unterhalb des Hydrauliktanks beidseitig horizontal verschoben zur Drehachse der Kurbelwelle positioniert sind und auf diese Weise einerseits eine vergleichsweise große Anzahl von Hydraulikpumpen bei gleichzeitig äußerst kurzen Verbindungswegen vom Hydrauliktank zu den einzelnen Hydraulikpumpen möglich ist. In dieser Ebene sitzt der Hydrauliktank somit unmittelbar oberhalb und mittig zu den Pumpen.Optimized arrangements of the hydraulic tank relative to other components are also possible with regard to the arrangement of individual components in a plan view of the axis of rotation of the crankshaft. In this context, a V-shaped arrangement has proven to be particularly optimal. For this purpose, provision can be made in particular for the axis of rotation of the crankshaft, at least two hydraulic pumps lying opposite one another as seen in the forward direction of the floor milling machine, and at least two air filters lying opposite one another to be arranged essentially in a V-shape, as seen in the axial direction of the crankshaft, with in particular in the two V-legs starting from the base point of the V-shaped arrangement formed by the axis of rotation of the crankshaft, there is in each case a hydraulic pump and in each case an air filter positioned above it in the vertical direction. The two V-legs open up a free space in between, which is ideal for accommodating the hydraulic tank, especially in the middle. An outstanding advantage of this specific arrangement lies in the fact that hydraulic pumps are positioned in the vertical direction below the hydraulic tank on both sides, horizontally offset to the axis of rotation of the crankshaft and in this way on the one hand a comparatively large number of hydraulic pumps with extremely short connection paths from the hydraulic tank to the individual hydraulic pumps is possible. In this level, the hydraulic tank sits directly above and in the middle of the pumps.
Eine weitere bevorzugte Weiterbildung der Erfindung besteht darin, dass in Längsrichtung der Bodenfräsmaschine und/oder horizontal und quer zur Drehachse der Kurbelwelle wenigstens ein Luftfilter vor und/oder hinter und/oder neben dem Hydrauliktank angeordnet ist, wobei der wenigstens eine Luftfilter insbesondere in vertikaler Verlängerung einer am Pumpenverteilergetriebe angeordneten Hydraulikpumpe positioniert ist. Der oder die Luftfilter sind dabei somit idealerweise zumindest teilweise in vertikaler Richtung gesehen im Bereich der Höhenerstreckung des Hydrauliktanks positioniert. Es ist ergänzend oder alternativ auch möglich, dass der Hydrauliktank, wenigstens zwei Luftfilter, das Pumpenverteilergetriebe und wenigstens zwei Hydraulikpumpen im Wesentlichen symmetrisch zueinander, insbesondere gleichzeitig V-förmig, angeordnet sind, insbesondere in Bezug auf eine vertikal und entlang der Drehachse der Kurbelwelle verlaufende Spiegelebene. Auch können ergänzend oder alternativ wenigstens zwei am Pumpenverteilergetriebe angeordnete Hydraulikpumpen, wenigstens ein neben dem Hydrauliktank positionierter Luftfilter und der Hydrauliktank in Bezug auf eine horizontale Bezugsebene oberhalb der Drehachse der Kurbelwelle angeordnet sein.A further preferred development of the invention consists in that at least one air filter is arranged in front of and/or behind and/or next to the hydraulic tank in the longitudinal direction of the ground milling machine and/or horizontally and transversely to the axis of rotation of the crankshaft, the at least one air filter being in particular in a vertical extension a hydraulic pump arranged on the pump transfer case. The air filter or filters are therefore ideally positioned at least partially in the vertical direction in the area of the hydraulic tank. In addition or as an alternative, it is also possible for the hydraulic tank, at least two air filters, the pump transfer case and at least two hydraulic pumps to be arranged essentially symmetrically to one another, in particular simultaneously in a V-shape, in particular in relation to a mirror plane running vertically and along the axis of rotation of the crankshaft . In addition or as an alternative, at least two hydraulic pumps arranged on the pump transfer case, at least one air filter positioned next to the hydraulic tank and the hydraulic tank can also be arranged above the axis of rotation of the crankshaft in relation to a horizontal reference plane.
Der Hydrauliktank ist bezüglich einer vertikalen und entlang der Drehachse der Kurbelwelle verlaufenden Bezugsebene bevorzugt spiegelsymmetrisch ausgebildet. Dies kann die Montage erleichtern.The hydraulic tank is preferably mirror-symmetrical with respect to a vertical reference plane running along the axis of rotation of the crankshaft. This can make assembly easier.
Das vorstehend beschriebene erfindungsgemäße Anordnungskonzept ermöglicht darüber hinaus hinsichtlich Herstellung und Wartung einer solchen erfindungsgemäßen Bodenfräsmaschine vielfältige bevorzugte Ausführungsformen. So eröffnet sich hierdurch beispielsweise die Möglichkeit, dass eine Funktionseinheit bzw. ein zusammenhängendes Baumodul vorhanden ist, umfassend den Hydrauliktank, das Pumpenverteilergetriebe und wenigstens zwei Hydraulikpumpen sowie wenigstens einen Luftfilter und vorzugsweise zusätzlich wenigstens eines der Elemente "Kupplung zwischen Verbrennungsmotor und Pumpenverteilergetriebe" und/oder "Schaltkupplung zwischen Pumpenverteilergetriebe und einer Zugmittelgetrieberolle" und/oder "ein weiterer Luftfilter mit Luftführung zum Verbrennungsmotor hin", die als eine zusammenhängende und separat zum Verbrennungsmotor bewegbare bzw. an diesen zusammenhängend anmontierbare Vormontagebaugruppe, insbesondere umfassend einen vom Maschinenrahmen unabhängigen Montagerahmen, ausgebildet ist. Funktionseinheit ist vorliegend insbesondere im baulichen Sinne dahingehend zu verstehen, dass diese Gesamtheit aus der Bodenfräsmaschine als Ganzes entnehmbar ausgebildet ist. Der Montagerahmen beschreibt eine in sich starre Tragstruktur, die es ermöglicht, dass die einzelnen der genannten Komponenten zueinander unabhängig vom Maschinenrahmen in einer ortsfesten Relativlage vormontierbar und/oder austauschbar sind.The arrangement concept according to the invention described above also enables a variety of preferred embodiments with regard to the manufacture and maintenance of such a ground milling machine according to the invention. This opens up the possibility, for example, that a functional unit or a coherent construction module is present, comprising the hydraulic tank, the pump transfer case and at least two hydraulic pumps as well as at least one air filter and preferably additionally at least one of the elements “coupling between the internal combustion engine and pump transfer case” and/or "Shifting clutch between pump transfer case and a traction drive roller" and/or "another air filter with air ducting to the combustion engine", which is designed as a coherent preassembled assembly that can be moved separately from the combustion engine or can be mounted on it as a coherent assembly, in particular comprising a mounting frame that is independent of the machine frame. In the present case, the functional unit is to be understood in particular in the structural sense to the effect that this entirety is designed to be removable from the ground milling machine as a whole. The assembly frame describes an inherently rigid support structure that allows the individual components mentioned to be preassembled and/or interchangeable in a stationary relative position to one another independently of the machine frame.
Die Funktionseinheit ist somit bevorzugt derart ausgebildet, dass sie als Gesamtheit aus der Bodenfräsmaschine entnehmbar ist und insbesondere wenigstens eine eigene Anbindungseinrichtung zur Anlage oder zum Eingriff für eine externe Hubeinrichtung aufweist. Eine solche Hubeinrichtung kann beispielsweise ein die Funktionseinheit hochhebender Gabelstapler oder eine die Funktionseinheit hochziehende Kraneinrichtung sein. Dies kann den Transport und/oder den Ein- und Ausbau der Funktionseinheit an der Bodenfräsmaschine erleichtern. Optimal ist es, wenn als Teil der Funktionseinheit gleichzeitig eine Anbindungseinrichtung, beispielsweise einstückig mit dem Montagerahmen ausgebildet, vorhanden ist. Ist dies der Fall, kann es vorteilhaft sein, wenn die Anbindungseinrichtung an der Funktionseinheit derart positioniert und ausgebildet ist, dass die Funktionseinheit im Kontakt mit der Hubeinrichtung im Wesentlichen ausbalanciert ist, insbesondere gleichzeitig im mit Betriebsfluiden befüllten Zustand und im hinsichtlich der Betriebsfluide Leerzustand.The functional unit is thus preferably designed in such a way that it can be removed as a whole from the ground milling machine and, in particular, has at least one separate connection device for System or intervention for an external lifting device. Such a lifting device can be, for example, a forklift that lifts the functional unit or a crane device that pulls up the functional unit. This can facilitate the transport and/or the installation and removal of the functional unit on the ground milling machine. It is optimal if a connection device, for example designed in one piece with the mounting frame, is also present as part of the functional unit. If this is the case, it can be advantageous if the connection device is positioned and designed on the functional unit in such a way that the functional unit is essentially balanced in contact with the lifting device, in particular simultaneously when it is filled with operating fluids and when it is empty with regard to the operating fluids.
Der Maschinenrahmen kann eine Lageraufnahme zur Lagerung des Verbrennungsmotors und/oder der Funktionseinheit und/oder des Pumpenverteilergetriebes aufweisen. Es ist dann bevorzugt, wenn der Maschinenrahmen in axialer Verlängerung der Kurbelwelle vom Primärantriebsaggregat weg eine Rahmenvertiefung, insbesondere eine Rahmenverjüngung derart umfasst, dass die Oberseite des Maschinenrahmens bis in Vertikalrichtung unterhalb des Verbrennungsmotors und/oder der Funktionseinheit und/oder des Pumpenverteilergetriebes und/oder der Schaltkupplung, insbesondere einer Kupplungsabdeckung bzw. Kupplungsglocke der Schaltkupplung, abgesenkt bzw. vertieft ist. Dies ermöglicht, dass der Verbrennungsmotor und/oder die weiteren vorstehend genannten Komponenten in vertikaler Richtung vergleichsweise niedrig am Maschinenrahmen von oben kommend positioniert werden können. Die Rahmenvertiefung erleichtert in diesem Fall Montage- und Wartungsarbeiten, da eine oder mehrere der vorstehend genannten Komponenten in axialer Richtung der Kurbelwelle über den Rahmen hinweg durch die Rahmenvertiefung in axialer Richtung hindurch bewegbar bzw. abziehbar sind.The machine frame can have a bearing mount for mounting the internal combustion engine and/or the functional unit and/or the pump transfer case. It is then preferred if the machine frame in the axial extension of the crankshaft away from the primary drive unit comprises a frame recess, in particular a frame tapering such that the upper side of the machine frame extends in the vertical direction below the internal combustion engine and/or the functional unit and/or the pump transfer case and/or the Clutch, in particular a clutch cover or clutch bell of the clutch, is lowered or deepened. This allows the internal combustion engine and/or the other components mentioned above to be positioned in the vertical direction comparatively low on the machine frame, coming from above. In this case, the frame recess facilitates assembly and maintenance work, since one or more of the aforementioned components can be moved or removed in the axial direction of the crankshaft across the frame through the frame recess in the axial direction.
Es ist erstrebenswert, wenn durch die Rahmenvertiefung jedoch nicht gleichzeitig eine Schwachstelle im Maschinenrahmen geschaffen wird. Um dies zu umgehen, kann es vorgesehen sein, dass die Rahmenvertiefung auf der Oberseite des Maschinenrahmens in horizontaler Verlängerung der Kurbelwelle derart ausgebildet ist, dass der Maschinenrahmen mit im wesentlichen konstantem Querschnittsprofil in diesem Bereich übergangsweise nach unten gezogen ausgebildet ist. In diesem Fall bildet sich die Rahmenvertiefung auf der gegenüberliegenden Unterseite des Maschinenrahmens als Rahmenvorsprung ab. Ergänzend oder alternativ kann jedoch der Maschinenrahmen im Bereich der Rahmenvertiefung, insbesondere der Rahmenverjüngung, auch dahingehend ausgebildet sein, dass die Unterseite horizontal gradlinig auf gleicher Höhe wie der sich an die Rahmenvertiefung, insbesondere zu beiden Seiten, anschließende Bereich des Maschinenrahmens, verläuft und/oder der Maschinenrahmen im Bereich der Rahmenvertiefung eine zusätzliche Stabilisierung, insbesondere Materialverdickung, aufweist. Der im Bereich der Rahmenvertiefung vorhandene zusätzliche Materialauftrag führt in diesem Fall vorzugsweise zu einer übergangsweisen und in vertikaler Richtung entlang der Längserstreckung des Maschinenrahmens zu- und abnehmenden Materialstärke des Maschinenrahmens und gleicht dadurch mit der Vertiefung in diesem Bereich einhergehende Strukturschwächungen aus.It is desirable if the frame depression does not create a weak point in the machine frame at the same time. In order to avoid this, it can be provided that the frame recess is formed on the upper side of the machine frame in the horizontal extension of the crankshaft in such a way that the machine frame is formed with a substantially constant cross-sectional profile in this area which is temporarily drawn downwards. In this case, the frame recess forms a frame projection on the opposite underside of the machine frame. Additionally or alternatively, however, the machine frame in the area of the frame recess, in particular the frame narrowing, can also be designed in such a way that the underside runs horizontally in a straight line at the same height as the area of the machine frame adjoining the frame recess, in particular on both sides, and/or the machine frame has additional stabilization in the area of the frame recess, in particular thickening of the material. In this case, the additional application of material in the area of the frame depression preferably leads to a transitional and vertical direction along the longitudinal extension of the machine frame. and decreasing material thickness of the machine frame and thus compensates for structural weaknesses associated with the deepening in this area.
Ein zur vorstehenden Erfindung eigenständiger aber auch mit dieser kombinierbarer Aspekt der Erfindung besteht darin, dass eine gattungsgemäße Bodenfräsmaschine eine Kühlluftführung mit wenigstens einem der nachfolgenden noch näher beschriebenen Merkmale aufweist. Während des Einsatzes solcher Bodenfräsmaschinen können erhebliche Erwärmungserscheinungen auftreten, beispielsweise naturgemäß am Verbrennungsmotor, im Hydraulikölkreislauf etc. Typischerweise umfassen Bodenfräsmaschinen daher ein Kühlsystem mit einer Motorkühleinrichtung und einer Hydraulikfluidkühleinrichtung. Die Motorkühleinrichtung kann einen ersten Lüfter und einen Kühlkreislauf mit einem Motorwärmetauscher aufweisen. In diesem Kühlkreislauf wird beispielsweise eine Kühlflüssigkeit zirkuliert, über die der Verbrennungsmotor im Betrieb gekühlt werden kann. Die von der Kühlflüssigkeit aufgenommene Wärme wird dabei am Wärmetauscher an Luft abgeben. Die Hydraulikfluidkühleinrichtung kann dagegen in der Weise eingerichtet, dass sie eine Abkühlung des sich während des Betriebs erwärmenden Hydraulikfluids ermöglicht, abermals häufig ebenfalls mithilfe eines Wärmetauschers und eines diesem zugeordneten Lüfters. Zur Kühlung können ein oder mehrere Kühlluftkanäle vorhanden sein, die derart ausgebildet sind, dass aus der Außenumgebung durch einen oder mehrere Lüfter Umgebungsluft angesaugt und den jeweiligen Wärmetauscher zugeführt wird. Dabei kann die Kühlluft auch durch einen Motorraum gesaugt werden. Für eine gattungsgemäße Bodenfräsmaschine sieht die Erfindung hiervon ausgehend bevorzugt vor, dass im Heckbereich der Bodenfräsmaschine wenigstens ein Sauggebläse vorhanden ist, das derart angeordnet ist, dass es erwärmte Kühlluft in Richtung nach schräg oben und hinten aus der Bodenfräsmaschine ausbläst. In Bezug auf die Vorwärts- bzw. Fräsrichtung wird die erwärmte Kühlluft somit entgegen der Fahrrichtung im Heckbereich ausgeblasen, konkret entgegen der Fahrrichtung nach schräg oben. Dies hat den Vorteil, dass kein Staub vom Boden durch die aus der Bodenfräsmaschine austretende Kühlluftströmung aufgewirbelt wird. Optimal kann es sein, wenn speziell für diese Anordnung zu dem ein Abgasauslass in Förderrichtung hinter dem Sauggebläse, d.h. ebenfalls im Heckbereich, derart angeordnet, dass aus dem Abgasauslass austretende Abgase direkt in den Kühlluftförderstrom austreten, wobei hierzu eine Auslassöffnung des Abgasauslasses bevorzugt in Förderrichtung der Kühlluft auf Höhe eines Lüfterrades des Sauggebläses angeordnet ist.An aspect of the invention that is independent of the above invention but can also be combined with it is that a floor milling machine of the generic type has a cooling air duct with at least one of the features described in more detail below. Significant heating phenomena can occur during use of such ground milling machines, for example naturally on the internal combustion engine, in the hydraulic oil circuit, etc. Ground milling machines therefore typically include a cooling system with an engine cooling device and a hydraulic fluid cooling device. The engine cooling device can have a first fan and a cooling circuit with an engine heat exchanger. A cooling liquid, for example, is circulated in this cooling circuit, via which the internal combustion engine can be cooled during operation. The heat absorbed by the cooling liquid is given off to the air at the heat exchanger. The hydraulic fluid cooling device, on the other hand, can be set up in such a way that it enables the hydraulic fluid that heats up during operation to be cooled, again often also with the aid of a heat exchanger and a fan assigned to it. One or more cooling air ducts can be present for cooling, which are designed in such a way that ambient air is sucked in from the outside environment by one or more fans and fed to the respective heat exchanger. The cooling air can also be sucked through an engine compartment. For a floor milling machine of this type, the invention preferably provides for at least one suction fan to be present in the rear area of the floor milling machine, which is arranged in such a way that it blows heated cooling air out of the floor milling machine in an oblique direction upwards and backwards. In relation to the forward or milling direction, the heated cooling air is blown out in the rear area counter to the direction of travel, specifically diagonally upwards counter to the direction of travel. This has the advantage that no dust is whirled up from the floor by the flow of cooling air exiting the floor milling machine. It can be optimal if, especially for this arrangement, an exhaust gas outlet is arranged behind the suction fan in the conveying direction, i.e. also in the rear area, in such a way that exhaust gases emerging from the exhaust gas outlet exit directly into the cooling air conveying flow, with an outlet opening of the exhaust gas outlet preferably being in the conveying direction of the Cooling air is arranged at the level of a fan wheel of the suction fan.
Nachstehend wird die Erfindung anhand der in den Figuren dargestellten Ausführungsbeispiele näher erläutert. Es zeigen schematisch:
Figur 1- eine Bodenfräsmaschine vom Typ Mittelrotorfräse in einer Seitenansicht;
Figur 2- eine schematische Draufsicht auf einzelne Komponenten der Bodenfräsmaschine aus
Figur 1 ; Figur 3- eine Draufsicht auf eine Antriebsbaugruppe in Axialrichtung der Kurbelwelle; und
- Figur 4
- eine Seitenansicht auf die
Antriebsbaugruppe aus Figur 3 .
- figure 1
- a center rotor type ground milling machine in a side view;
- figure 2
- shows a schematic plan view of individual components of the floor milling machine
figure 1 ; - figure 3
- a plan view of a drive assembly in the axial direction of the crankshaft; and
- figure 4
- a side view of the drive assembly
figure 3 .
Baugleiche oder funktionsgleiche Bauteile sind in Figuren mit gleichen Bezugszeichen gekennzeichnet, wobei nicht jedes sich in den Figuren wiederholende Bauteil separat bezeichnet sein muss.Components that are structurally identical or have the same function are identified in the figures with the same reference symbols, it not being necessary for every component that is repeated in the figures to be identified separately.
Ein beispielhafter Antriebsstrang 13 der Bodenfräsmaschine 1, insbesondere für eine Straßenkaltfräse, ist in
Teil des Hydrauliksystems ist ferner ein Hydrauliktank 23, der, wie in
Die
Insbesondere
Die
Die Funktionseinheit 28 umfasst schließlich laschenförmige Anbindungseinrichtungen 30, die vorliegend durch den Montagerahmen 29 oder beispielsweise ein Gehäuse des Pumpenverteilergetriebe bis 16 gebildet werden können.Finally, the
Claims (10)
dass der Hydrauliktank wenigstens teilweise in vertikaler Verlängerung des Pumpenverteilergetriebes oberhalb des Pumpenverteilergetriebes angeordnet ist.Self-propelled ground milling machine, in particular road cold milling machine, stabilizer or recycler comprising
that the hydraulic tank is arranged at least partially in a vertical extension of the pump distributor gear above the pump distributor gear.
dadurch gekennzeichnet,
dass der Hydrauliktank wenigstens gemäß einem der folgenden Merkmale angeordnet ist:
characterized,
that the hydraulic tank is arranged according to at least one of the following features:
dadurch gekennzeichnet,
dass die Drehachse der Kurbelwelle, wenigstens zwei einander gegenüberliegende Hydraulikpumpen und wenigstens zwei einander gegenüberliegende Luftfilter in Axialrichtung der Kurbelwelle gesehen im Wesentlichen V-förmig angeordnet sind, wobei insbesondere in den beiden V-Schenkeln vom durch die Drehachse der Kurbelwelle gebildeten Fußpunkt der V-förmigen Anordnung ausgehend jeweils eine Hydraulikpumpe und jeweils eine in Vertikalrichtung darüber positionierter Luftfilter vorhanden sind, wobei der Hydrauliktank zwischen den beiden Schenkeln, insbesondere mittig, angeordnet ist.Self-propelled ground milling machine according to any one of the preceding claims,
characterized,
that the axis of rotation of the crankshaft, at least two hydraulic pumps located opposite one another and at least two air filters located opposite one another are arranged essentially in a V-shape when viewed in the axial direction of the crankshaft, with the V-shaped Arrangement based on one hydraulic pump and one air filter positioned above it in the vertical direction, the hydraulic tank being arranged between the two legs, in particular in the middle.
dadurch gekennzeichnet,
dass der Hydrauliktank wenigstens gemäß einem der folgenden Merkmale angeordnet ist:
characterized,
that the hydraulic tank is arranged according to at least one of the following features:
dadurch gekennzeichnet,
dass der Hydrauliktank bezüglich einer vertikalen und entlang der Drehachse der Kurbelwelle verlaufenden Bezugsebene spiegelsymmetrisch ausgebildet ist.Self-propelled ground milling machine according to any one of the preceding claims,
characterized,
that the hydraulic tank is mirror-symmetrical with respect to a vertical reference plane running along the axis of rotation of the crankshaft.
dadurch gekennzeichnet,
dass Funktionseinheit als Gesamtheit aus der Bodenfräsmaschine entnehmbar ist und insbesondere wenigstens eine eigene Anbindungseinrichtung zur Anlage oder zum Eingriff für eine externe Hubeinrichtung aufweist, wobei die Anbindungseinrichtung an der Funktionseinheit bevorzugt derart positioniert ist, dass die Funktionseinheit im Kontakt mit der Hubeinrichtung im Wesentlichen ausbalanciert ist, insbesondere gleichzeitig im mit Betriebsfluiden befüllten Zustand und im hinsichtlich der Betriebsfluide Leerzustand.Self-propelled ground milling machine according to claim 6,
characterized,
that the functional unit can be removed as a whole from the ground milling machine and in particular has at least one separate connection device for contacting or engaging an external lifting device, the connection device on the functional unit preferably being positioned in such a way that the functional unit is essentially balanced when in contact with the lifting device, in particular simultaneously in the state filled with operating fluids and in the empty state with regard to the operating fluids.
dadurch gekennzeichnet,
dass der Maschinenrahmen eine Lageraufnahme zur Lagerung des Verbrennungsmotors und/oder der Funktionseinheit und/oder des Pumpenverteilergetriebes aufweist, wobei in axialer Verlängerung der Kurbelwelle vom Verbrennungsmotor weg eine Rahmenvertiefung, insbesondere eine Rahmenverjüngung derart vorhanden ist, dass die Oberseite des Maschinenrahmens bis in Vertikalrichtung unterhalb des Verbrennungsmotors und/oder der Funktionseinheit und/oder des Pumpenverteilergetriebes und/oder eine Schaltkupplung, insbesondere einer Kupplungsabdeckung der Schaltkupplung, abgesenkt ist.Self-propelled ground milling machine according to any one of the preceding claims,
characterized,
that the machine frame has a bearing mount for mounting the internal combustion engine and/or the functional unit and/or the pump transfer case, with a frame recess, in particular a frame tapering, being present in the axial extension of the crankshaft away from the internal combustion engine such that the upper side of the machine frame extends vertically below the Internal combustion engine and / or the functional unit and / or the pump transfer case and / or a clutch, in particular a clutch cover of the clutch, is lowered.
dadurch gekennzeichnet,
dass der Maschinenrahmen im Bereich der Rahmenvertiefung, insbesondere der Rahmenverjüngung, wenigstens eines der folgenden Merkmale aufweist:
characterized,
that the machine frame has at least one of the following features in the area of the frame recess, in particular the frame narrowing:
dadurch gekennzeichnet,
dass eine Kühlluftführung mit wenigstens einem der folgenden Merkmale vorhanden ist:
characterized,
that there is a cooling air duct with at least one of the following features:
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DE102021001760 | 2021-04-06 | ||
DE102021118786.9A DE102021118786A1 (en) | 2021-04-06 | 2021-07-20 | SELF-PROPELLED TILLER |
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CN211689805U (en) | 2019-12-08 | 2020-10-16 | 张学松 | Asphalt pavement milling machine |
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2022
- 2022-03-23 EP EP22163953.7A patent/EP4071302B1/en active Active
- 2022-04-05 US US17/657,963 patent/US11939731B2/en active Active
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US11939731B2 (en) | 2024-03-26 |
US20220316155A1 (en) | 2022-10-06 |
EP4071302B1 (en) | 2023-05-03 |
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