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EP2801666B1 - Road milling machine, in particular small milling cutter, for machining of road surfaces - Google Patents

Road milling machine, in particular small milling cutter, for machining of road surfaces Download PDF

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Publication number
EP2801666B1
EP2801666B1 EP14166744.4A EP14166744A EP2801666B1 EP 2801666 B1 EP2801666 B1 EP 2801666B1 EP 14166744 A EP14166744 A EP 14166744A EP 2801666 B1 EP2801666 B1 EP 2801666B1
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EP
European Patent Office
Prior art keywords
drum
milling machine
accordance
road
gearbox
Prior art date
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Application number
EP14166744.4A
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German (de)
French (fr)
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EP2801666A1 (en
Inventor
Dirk Franzmann
Christian Berning
Cyrus Barimani
Philip Verhaelen
Günter HÄHN
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Wirtgen GmbH
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Wirtgen GmbH
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Publication of EP2801666A1 publication Critical patent/EP2801666A1/en
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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
    • E01C23/12—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

Definitions

  • the invention relates to a road milling machine, in particular small milling machine, for machining road surfaces according to the preamble of claim 1.
  • Such a small milling machine is known for example under the name Wirtgen W50 DC.
  • the basic construction of a generic road milling machine is from the DE 196 31 042 A1 known.
  • the small milling machine has a milling roller which is mounted on the machine frame in a roll box and which can be driven by a milling drum drive.
  • the known milling drum drive has a roller gear which is partially arranged in the roller box and partly outside of the roller box.
  • the roller gear is fixed by means of a connecting flange on an end wall of the roller box.
  • a further disadvantage of the known construction form is the fact that the housing part located outside the roller box is at a higher level than the housing part located in the roller box and thus two separate oil households are necessary.
  • the separate oil households require additional components, such as pumps or oil cooler, and have temperature problems due to lack of temperature compensation between the two gear parts.
  • the invention is therefore an object of the invention to improve a road milling machine, especially a small milling machine of the type mentioned in that the susceptibility to interference of the roller gear is reduced and the potential applications of the road milling machine to be expanded.
  • the invention provides in an advantageous manner that the transmission housing on the underside between the reduction gear and the connecting flange has a gear housing dividing, radially inwardly extending recess, such that in a arranged outside the drum box first housing part, the reduction gear and in an in the roller box protruding second housing part with a substantially rotationally symmetrical to the output axis cross-sectional shape of the output shaft is arranged.
  • the invention provides that the reduction gear is arranged completely outside the roller box, so that the projecting into the roller box second housing part can be designed substantially rotationally symmetric with minimal cross-section. In this way, blocking of the milling drum by milled material is reliably excluded, wherein also the wear on the inner shell of the milling drum and the second housing part is minimized.
  • Another advantage is that a variety of special rollers with reduced cutting circle, and milling drums with axially variable diameter, z. B. spherical milling drums, can be used.
  • the arranged at the bottom between the reduction gear and the connection flange vertical recess can receive a movable side plate, which can largely prevent the leakage of milled material from the interior of the roller box at different cutting depths of the roller box.
  • the reduction gear is located completely in the first housing part and that the output shaft extends from the reduction gear into the second housing part located in the roller box. It is thus provided that the housing part located in the roller box receives only the output shaft. Characterized in that the second housing part receives only the output shaft and the necessary storage for this purpose, the outer diameter of the second housing part is reduced to a diameter which is determined substantially only by the outer diameter of the bearing and the wall thickness of the gear housing. In this respect, the diameter of the second housing part can be largely reduced and assume a substantially rotationally symmetrical cross-sectional shape.
  • the distance of the housing wall of the projecting into the roller box part of the housing from the output shaft in the region of the recess is reduced to a gap allowing the oil circulation.
  • the gear housing is recessed at the bottom U-shaped. This means that the radially inwardly extending recess also extends laterally vertically next to the output shaft. In this way, with the help of a side shield a lateral sealing of the roller box can be achieved even at different cutting depths.
  • the U-shaped recess in the lower housing comprises an angular range about the axis of rotation of the output shaft of for example 180 ° to 300 °, preferably more than 240 °.
  • a recess can with a recess adapted thereto in a side guard, z. B. a vertical side plate cooperate to seal the roller box on the drive side.
  • a conveyor in the first housing part conveys oil in the upper region of the reduction gear. From there, the oil, for example via a channel in the projecting into the roll case housing part flow, so that an oil circulation in a single oil budget is possible.
  • the conveyor may be element of the reduction gear.
  • a rotating in the oil sump gear of the reduction gear is used to transport the oil into a drip pan, of which the oil is supplied via at least one channel only the output shaft containing the second gear part.
  • the channel may extend to the storage of the output shaft at its free end.
  • the protruding into the roller box part of the housing can have a diameter which is only slightly larger than the maximum diameter of the bearing for the drive shaft.
  • the outer end face of the overhung milling drum almost flush with the lateral outer side of the machine frame, the so-called zero side closes to allow the closest possible milling along obstacles.
  • the machine frame is preferably carried by a chassis with a front and rear axle with wheels, wherein the milling drum is arranged between the rear wheels.
  • This arrangement relates to the normal operation of the road milling machine, in which both rear wheels are arranged coaxially and preferably in a vertical plane with the Fräswalzenachse.
  • a pivotable rear wheel is provided, which can be pivoted to a position in front of the milling drum and relative to the neutral side inwards.
  • Such an arrangement is for example also from the DE 103 47 873 A1 known.
  • the road milling machine is preferably a Häderfräsmaschine, in the direction of travel behind the milling drum a rear-loading transport device for the processed from the milling drum milled material is arranged.
  • Fig. 1 shown self-propelled road milling machine 1 for editing road surfaces, z.
  • a small milling machine has a machine frame 4, and a drive motor 6 for the drive of driving devices 8 and working equipment.
  • the driving devices 8 are in the embodiment of the Fig. 1 made of wheels, but may also consist entirely or partially of crawler tracks.
  • the main working device consists of a milling drum 12 drivable by a milling drum drive with a roller gear 10 for milling the road surface.
  • Fig. 2 shows a perspective view of the mounted milling drum 12 with a connecting flange 14 and a bandage 16, which carries a plurality of systematically arranged tools 18.
  • Fig. 3 shows a section through the roller gear 10 with a gear housing 20 which can be fixed to an end wall of a roller box 2 such that a first housing part 20a is arranged with a two-stage reduction gear 24 outside of the roller box 2 and a second housing part 20b through an opening in the Front wall of the roller box 2 protrudes into the roller box 2.
  • a first housing part 20a is arranged with a two-stage reduction gear 24 outside of the roller box 2 and a second housing part 20b through an opening in the Front wall of the roller box 2 protrudes into the roller box 2.
  • Fig. 2 the end wall of the roller box 2 is not shown.
  • a recess 28 is provided between the connecting flange 22 for attachment to the end wall of the roller box 2 and the reduction gear 24, which extends in a U-shape in the vicinity of the output shaft 26, as best of Fig. 4 is apparent.
  • the recess 28 extends both below the output shaft and laterally thereof and allows the inclusion of a movable side plate 36 for lateral sealing of the roller box 2 with a complementary recess 29 adapted to the shape of the recess 28.
  • the recess 28 in the lower gear housing 20 preferably comprises an in Fig. 4 apparent angular range 48 about the axis of rotation of the output shaft 26 of about 180 ° to about 300 °, preferably more than 240 °.
  • oil from the lower part of the gear housing 20 can be conveyed up into a collecting trough 40, from where the oil via a channel 30 in the second housing part 20 b to a bearing 42 at the free end of the output shaft 26th can be transported.
  • a space-saving and energetically neutral pump is created by a rotating in the oil sump gear 38 oil transported into the sump 40.
  • the oil can pass from the sump 40 by gravity into the other housing part 20b.
  • the resulting internal oil flow leads to an optimal temperature distribution of the oil in the roller gear 10.
  • the oil level 34 in the transmission is indicated by a wavy line.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Details Of Gearings (AREA)
  • Road Repair (AREA)

Description

Die Erfindung betrifft eine Straßenfräsmaschine, insbesondere Kleinfräse, zum Bearbeiten von Straßenoberflächen nach dem Oberbegriff des Anspruchs 1.The invention relates to a road milling machine, in particular small milling machine, for machining road surfaces according to the preamble of claim 1.

Eine derartige Kleinfräse ist beispielsweise unter der Bezeichnung Wirtgen W50 DC bekannt. Die grundsätzliche Konstruktion einer gattungsgemäßen Straßenfräsmaschine ist aus der DE 196 31 042 A1 bekannt.Such a small milling machine is known for example under the name Wirtgen W50 DC. The basic construction of a generic road milling machine is from the DE 196 31 042 A1 known.

Die Kleinfräse weist eine an dem Maschinenrahmen in einem Walzenkasten fliegend gelagerte Fräswalze auf, die von einem Fräswalzenantrieb angetrieben werden kann.The small milling machine has a milling roller which is mounted on the machine frame in a roll box and which can be driven by a milling drum drive.

Der bekannte Fräswalzenantrieb weist ein Walzengetriebe auf, das teilweise im Walzenkasten angeordnet ist und teilweise außerhalb des Walzenkastens. Hierzu ist das Walzengetriebe mit Hilfe eines Anschlussflansches an einer Stirnwand des Walzenkastens befestigt.The known milling drum drive has a roller gear which is partially arranged in the roller box and partly outside of the roller box. For this purpose, the roller gear is fixed by means of a connecting flange on an end wall of the roller box.

Bei einem bekannten Walzengetriebe gemäß DE 10 2010 014 529 A ist zumindest ein Teil des Untersetzungsgetriebes in dem im Walzenkasten befindlichen Getriebegehäuse angeordnet, so dass die fliegend gelagerte Fräswalze das relativ zur Abtriebswelle des Walzengetriebes exzentrische Getriebegehäuse im oberen Bereich mit einem relativ kleinen Spalt umschließt. Ein derartiges, in den Walzenkasten hineinragendes Getriebegehäuse hat den Nachteil, dass in das Innere der Fräswalze eindringendes Fräsgut sich in den engen Spalt zwischen dem Getriebegehäuse und dem Innenmantel der Fräswalze festsetzt und dort zu erhöhter Reibung und Verschleiß und letztlich zu einem Leistungsverlust führt. Im Extremfall kann sich das Fräsgut in dem Spalt verkeilen und den Fräsantrieb blockieren, wodurch die Straßenfräsmaschine erheblich beschädigt werden kann.Erschwerend kommt hinzu, dass nicht nur der enge Spalt alleine, sondern die Keilform des Spaltes die Probleme erzeugt, wenn eine im Querschnitt kreisrunde Fräswalze über einen exzentrischen bzw. nicht zu der Abtriebswelle rotationssymmetrischen Getriebehals gestülpt wird. Durch die Keilform wird das Fräsgut bei ortsfestem Getriebehals und sich drehender Fräswalze in den Spalt hereingezogen und verdichtet.In a known roller gear according to DE 10 2010 014 529 A At least a portion of the reduction gear is arranged in the housing located in the gearbox housing, so that the overhung milling drum the relative to the output shaft of the roller gear eccentric gear housing in the upper Enclosing area with a relatively small gap. Such a, in the roll box projecting gear housing has the disadvantage that in the interior of the milling drum penetrating milled material settles in the narrow gap between the gear housing and the inner shell of the milling drum and there leads to increased friction and wear and ultimately to a loss of performance. In extreme cases, the material to be milled can become wedged in the gap and block the milling drive, which can considerably damage the road milling machine. It is also noteworthy that not only the narrow gap alone, but the wedge shape of the gap creates the problems when a milling drum of circular cross-section is slipped over an eccentric or not rotationally symmetrical to the output shaft gear neck. Due to the wedge shape, the milled material is drawn into the gap when the gear unit neck is stationary and the milling drum rotating, and compacted.

Ein weiterer Nachteil des bekannten Standes der Technik besteht darin, dass dadurch, dass das Getriebegehäuse den freien Innenraum der Fräswalze nach oben fast vollständig ausnutzt, keine Fräswalzen mit einem relativ kleinen Durchmesser oder einer balligen Form eingesetzt werden können.Another disadvantage of the known prior art is that the fact that the gear housing almost completely exploits the free space of the milling drum upwards, no milling rollers with a relatively small diameter or a spherical shape can be used.

Schließlich ist ein weiterer Nachteil der bekannten Konstruktionsform darin zu sehen, dass der außerhalb des Walzenkastens befindliche Gehäuseteil auf einem höheren Niveau liegt als der in dem Walzenkasten befindliche Gehäuseteil und somit zwei getrennte Ölhaushalte notwendig sind. Die getrennten Ölhaushalte erfordern zusätzliche Bauteile, wie Pumpen oder Ölkühler, und weisen mangels Temperaturausgleich zwischen den beiden Getriebeteilen Temperaturprobleme auf.Finally, a further disadvantage of the known construction form is the fact that the housing part located outside the roller box is at a higher level than the housing part located in the roller box and thus two separate oil households are necessary. The separate oil households require additional components, such as pumps or oil cooler, and have temperature problems due to lack of temperature compensation between the two gear parts.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Straßenfräsmaschine, insbesondere eine Kleinfräse, der eingangs genannten Art dahingehend zu verbessern, dass die Störungsanfälligkeit des Walzengetriebes verringert wird und die Einsatzmöglichkeiten der Straßenfräsmaschine erweitert werden.The invention is therefore an object of the invention to improve a road milling machine, especially a small milling machine of the type mentioned in that the susceptibility to interference of the roller gear is reduced and the potential applications of the road milling machine to be expanded.

Zur Lösung dieser Aufgabe dienen die Merkmale des Anspruchs 1.To solve this problem serve the features of claim 1.

Die Erfindung sieht in vorteilhafter Weise vor, dass das Getriebegehäuse an der Unterseite zwischen dem Untersetzungsgetriebe und dem Anschlussflansch eine das Getriebegehäuse aufteilende, sich radial nach innen erstreckende Aussparung aufweist, derart, dass in einem außerhalb des Walzenkastens angeordneten ersten Gehäuseteil das Untersetzungsgetriebe und in einem in den Walzenkasten hineinragenden zweiten Gehäuseteil mit einer im Wesentlichen zur Abtriebsachse rotationssymmetrischen Querschnittsform die Abtriebswelle angeordnet ist.The invention provides in an advantageous manner that the transmission housing on the underside between the reduction gear and the connecting flange has a gear housing dividing, radially inwardly extending recess, such that in a arranged outside the drum box first housing part, the reduction gear and in an in the roller box protruding second housing part with a substantially rotationally symmetrical to the output axis cross-sectional shape of the output shaft is arranged.

Die Erfindung sieht vor, dass das Untersetzungsgetriebe vollständig außerhalb des Walzenkastens angeordnet ist, so dass der in den Walzenkasten hineinragende zweite Gehäuseteil im Wesentlichen rotationssymmetrisch mit minimalem Querschnitt gestaltet werden kann. Auf diese Weise ist ein Blockieren der Fräswalze durch Fräsgut sicher ausgeschlossen, wobei außerdem auch der Verschleiß an dem Innenmantel der Fräswalze und dem zweiten Gehäuseteil minimiert wird.The invention provides that the reduction gear is arranged completely outside the roller box, so that the projecting into the roller box second housing part can be designed substantially rotationally symmetric with minimal cross-section. In this way, blocking of the milling drum by milled material is reliably excluded, wherein also the wear on the inner shell of the milling drum and the second housing part is minimized.

Ein weiterer Vorteil besteht darin, dass eine Vielzahl von Sonderwalzen mit reduziertem Schnittkreis, sowie Fräswalzen mit in Axialrichtung veränderlichem Durchmesser, z. B. ballige Fräswalzen, zum Einsatz kommen können. Die an der Unterseite zwischen dem Untersetzungsgetriebe und dem Anschlussflansch angeordnete vertikale Aussparung kann ein bewegliches Seitenschild aufnehmen, das das Austreten von Fräsgut aus dem Inneren des Walzenkastens bei unterschiedlichen Frästiefen des Walzenkastens weitgehend verhindern kann.Another advantage is that a variety of special rollers with reduced cutting circle, and milling drums with axially variable diameter, z. B. spherical milling drums, can be used. The arranged at the bottom between the reduction gear and the connection flange vertical recess can receive a movable side plate, which can largely prevent the leakage of milled material from the interior of the roller box at different cutting depths of the roller box.

Vorzugsweise ist vorgesehen, dass sich das Untersetzungsgetriebe vollständig im ersten Gehäuseteil befindet und, dass sich die Abtriebswelle von dem Untersetzungsgetriebe in das im Walzenkasten befindliche zweite Gehäuseteil erstreckt. Es ist somit vorgesehen, dass der im Walzenkasten befindliche Gehäuseteil nur die Abtriebswelle aufnimmt. Dadurch, dass das zweite Gehäuseteil nur die Abtriebswelle sowie die die hierzu notwendige Lagerung aufnimmt, wird der Außendurchmesser des zweiten Gehäuseteils auf einen Durchmesser reduziert, der im Wesentlichen nur durch den Außendurchmesser der Lagerung und die Wandstärke des Getriebegehäuses bestimmt wird. Insofern kann der Durchmesser des zweiten Gehäuseteils weitestgehend reduziert werden und eine im Wesentlichen rotationssymmetrische Querschnittsform annehmen.It is preferably provided that the reduction gear is located completely in the first housing part and that the output shaft extends from the reduction gear into the second housing part located in the roller box. It is thus provided that the housing part located in the roller box receives only the output shaft. Characterized in that the second housing part receives only the output shaft and the necessary storage for this purpose, the outer diameter of the second housing part is reduced to a diameter which is determined substantially only by the outer diameter of the bearing and the wall thickness of the gear housing. In this respect, the diameter of the second housing part can be largely reduced and assume a substantially rotationally symmetrical cross-sectional shape.

Vorzugsweise ist vorgesehen, dass der Abstand der Gehäusewand des in den Walzenkasten ragenden Teils des Gehäuses von der Abtriebswelle im Bereich der Aussparung auf einen die Ölzirkulation erlaubenden Spalt reduziert ist.It is preferably provided that the distance of the housing wall of the projecting into the roller box part of the housing from the output shaft in the region of the recess is reduced to a gap allowing the oil circulation.

Vorzugsweise ist das Getriebegehäuse an der Unterseite U-förmig ausgespart. Dies bedeutet, dass sich die sich radial nach innen erstreckende Aussparung seitlich auch neben der Abtriebswelle vertikal nach oben erstreckt. Auf diese Weise kann mit Hilfe eines Seitenschildes eine seitliche Abdichtung des Walzenkastens auch bei unterschiedlichen Frästiefen erreicht werden.Preferably, the gear housing is recessed at the bottom U-shaped. This means that the radially inwardly extending recess also extends laterally vertically next to the output shaft. In this way, with the help of a side shield a lateral sealing of the roller box can be achieved even at different cutting depths.

Die U-förmige Aussparung im unteren Gehäuse umfasst einen Winkelbereich um die Rotationsachse der Abtriebswelle von beispielsweise 180° bis 300°, vorzugsweise mehr als 240°. Eine derartige Aussparung kann mit einer daran angepassten Aussparung in einer seitlichen Schutzeinrichtung, z. B. einem vertikalen Seitenschild zusammenwirken, um den Walzenkasten antriebsseitig abzudichten.The U-shaped recess in the lower housing comprises an angular range about the axis of rotation of the output shaft of for example 180 ° to 300 °, preferably more than 240 °. Such a recess can with a recess adapted thereto in a side guard, z. B. a vertical side plate cooperate to seal the roller box on the drive side.

Bei einem besonders bevorzugten Ausführungsbeispiel ist vorgesehen, dass eine Fördereinrichtung in dem ersten Gehäuseteil Öl in den oberen Bereich des Untersetzungsgetriebes befördert. Von dort kann das Öl, beispielsweise über einen Kanal in den in den Walzenkasten hineinragenden Gehäuseteil fließen, so dass eine Ölzirkulation in einem einzigen Ölhaushalt möglich ist.In a particularly preferred embodiment it is provided that a conveyor in the first housing part conveys oil in the upper region of the reduction gear. From there, the oil, for example via a channel in the projecting into the roll case housing part flow, so that an oil circulation in a single oil budget is possible.

Die Fördereinrichtung kann Element des Untersetzungsgetriebes sein.The conveyor may be element of the reduction gear.

Vorzugsweise wird hierzu ein sich im Ölsumpf drehendes Zahnrad des Untersetzungsgetriebes verwendet, um das Öl in eine Auffangwanne zu befördern, von der das Öl über mindestens einen Kanal dem nur die Abtriebswelle enthaltenden zweiten Getriebeteil zuführbar ist. Der Kanal kann dabei bis zur Lagerung der Abtriebswelle an ihrem freien Ende reichen.Preferably, for this purpose, a rotating in the oil sump gear of the reduction gear is used to transport the oil into a drip pan, of which the oil is supplied via at least one channel only the output shaft containing the second gear part. The channel may extend to the storage of the output shaft at its free end.

Der in den Walzenkasten ragende Teil des Gehäuses kann dabei einen Durchmesser aufweisen, der nur geringfügig größer ist als der maximale Durchmesser der Lagerung für die Antriebswelle.The protruding into the roller box part of the housing can have a diameter which is only slightly larger than the maximum diameter of the bearing for the drive shaft.

Bei einem bevorzugten Ausführungsbeispiel ist vorgesehen, dass die äußere Stirnseite der fliegend gelagerten Fräswalze nahezu bündig mit der seitlichen Außenseite des Maschinenrahmens, der sogenannten Nullseite, abschließt, um ein möglichst nahes Fräsen entlang von Hindernissen zu ermöglichen. Dabei ist der Maschinenrahmen vorzugsweise von einem Fahrwerk mit einer Vorder- und Hinterachse mit Rädern getragen, wobei die Fräswalze zwischen den Hinterrädern angeordnet ist. Diese Anordnung betrifft den Normalbetrieb der Straßenfräsmaschine, bei der beide Hinterräder koaxial und vorzugsweise in einer vertikalen Ebene mit der Fräswalzenachse angeordnet sind. Bei kantennahem Betrieb kann es sein, dass auf der Nullseite ein schwenkbares Hinterrad vorgesehen ist, das in eine Position vor die Fräswalze und relativ zur Nullseite nach innen verschwenkt werden kann. Eine derartige Anordnung ist beispielsweise auch aus der DE 103 47 873 A1 bekannt.In a preferred embodiment, it is provided that the outer end face of the overhung milling drum almost flush with the lateral outer side of the machine frame, the so-called zero side closes to allow the closest possible milling along obstacles. In this case, the machine frame is preferably carried by a chassis with a front and rear axle with wheels, wherein the milling drum is arranged between the rear wheels. This arrangement relates to the normal operation of the road milling machine, in which both rear wheels are arranged coaxially and preferably in a vertical plane with the Fräswalzenachse. In near-edge operation, it may be that on the null side, a pivotable rear wheel is provided, which can be pivoted to a position in front of the milling drum and relative to the neutral side inwards. Such an arrangement is for example also from the DE 103 47 873 A1 known.

Die Straßenfräsmaschine ist vorzugsweise eine Hinterladerfräsmaschine, bei der in Fahrtrichtung hinter der Fräswalze eine nach hinten abladende Transportvorrichtung für das von der Fräswalze abgearbeitete Fräsgut angeordnet ist.The road milling machine is preferably a Hinterladerfräsmaschine, in the direction of travel behind the milling drum a rear-loading transport device for the processed from the milling drum milled material is arranged.

Im Folgenden wird unter Bezugnahme auf die Zeichnungen ein Ausführungsbeispiel der Erfindung näher erläutert.In the following an embodiment of the invention will be explained in more detail with reference to the drawings.

Es zeigen:

Fig. 1
eine Kleinfräse,
Fig. 2
die auf einen Fräswalzenantrieb montierte Fräswalze,
Fig. 3
einen Schnitt durch das Walzengetriebe, und
Fig. 4
einen Schnitt entlang der Linie IV-IV in Fig. 3.
Show it:
Fig. 1
a small milling machine,
Fig. 2
the milling drum mounted on a milling drum drive,
Fig. 3
a section through the roller gear, and
Fig. 4
a section along the line IV-IV in Fig. 3 ,

Die in Fig. 1 gezeigte selbstfahrende Straßenfräsmaschine 1 zum Bearbeiten von Straßenoberflächen, z. B. eine Kleinfräse, weist einen Maschinenrahmen 4 auf, sowie einen Antriebsmotor 6 für den Antrieb von Fahreinrichtungen 8 und von Arbeitseinrichtungen. Die Fahreinrichtungen 8 bestehen in dem Ausführungsbeispiel der Fig. 1 aus Rädern, können aber ganz oder teilweise auch aus Kettenlaufwerken bestehen. Die hauptsächliche Arbeitseinrichtung besteht aus einer von einem Fräswalzenantrieb mit einem Walzengetriebe 10 antreibbaren Fräswalze 12 zum Fräsen der Straßenoberfläche.In the Fig. 1 shown self-propelled road milling machine 1 for editing road surfaces, z. As a small milling machine, has a machine frame 4, and a drive motor 6 for the drive of driving devices 8 and working equipment. The driving devices 8 are in the embodiment of the Fig. 1 made of wheels, but may also consist entirely or partially of crawler tracks. The main working device consists of a milling drum 12 drivable by a milling drum drive with a roller gear 10 for milling the road surface.

Fig. 2 zeigt eine perspektivische Ansicht der montierten Fräswalze 12 mit einem Anschlussflansch 14 und einer Bandage 16, die eine Vielzahl von systematisch angeordneten Werkzeugen 18 trägt. Fig. 2 shows a perspective view of the mounted milling drum 12 with a connecting flange 14 and a bandage 16, which carries a plurality of systematically arranged tools 18.

Fig. 3 zeigt einen Schnitt durch das Walzengetriebe 10 mit einem Getriebegehäuse 20, das an einer Stirnwand eines Walzenkastens 2 derart befestigt werden kann, dass ein erster Gehäuseteil 20a mit einem zweistufigen Untersetzungsgetriebe 24 außerhalb des Walzenkastens 2 angeordnet ist und ein zweiter Gehäuseteil 20b durch eine Öffnung in der Stirnwand des Walzenkastens 2 in den Walzenkasten 2 hineinragt. In Fig. 2 ist die Stirnwand des Walzenkastens 2 nicht gezeigt. Fig. 3 shows a section through the roller gear 10 with a gear housing 20 which can be fixed to an end wall of a roller box 2 such that a first housing part 20a is arranged with a two-stage reduction gear 24 outside of the roller box 2 and a second housing part 20b through an opening in the Front wall of the roller box 2 protrudes into the roller box 2. In Fig. 2 the end wall of the roller box 2 is not shown.

An dem freien, in den Walzenkasten 2 hineinragenden Ende des Gehäuseteils 20b stehen axial Stehbolzen 39 zur Befestigung der Fräswalze 12 ab, die drehfest mit der Abtriebswelle 26 gekoppelt sind.At the free, projecting into the roller box 2 end of the housing part 20b are axially stud bolts 39 for attachment of the milling drum 12, which are rotatably coupled to the output shaft 26.

An der Unterseite des Getriebegehäuses 20 ist zwischen dem Anschlussflansch 22 zur Befestigung an der Stirnwand des Walzenkastens 2 und dem Untersetzungsgetriebe 24 eine Aussparung 28 vorgesehen, die sich U-förmig im Umfeld der Abtriebswelle 26 erstreckt, wie am besten aus Fig. 4 ersichtlich ist.On the underside of the gear housing 20, a recess 28 is provided between the connecting flange 22 for attachment to the end wall of the roller box 2 and the reduction gear 24, which extends in a U-shape in the vicinity of the output shaft 26, as best of Fig. 4 is apparent.

Die Aussparung 28 erstreckt sich sowohl unterhalb der Abtriebswelle als auch seitlich davon und ermöglicht die Aufnahme eines beweglichen Seitenschildes 36 zur seitlichen Abdichtung des Walzenkastens 2 mit einer der Form der Aussparung 28 angepassten komplementären Aussparung 29.The recess 28 extends both below the output shaft and laterally thereof and allows the inclusion of a movable side plate 36 for lateral sealing of the roller box 2 with a complementary recess 29 adapted to the shape of the recess 28.

Die Aussparung 28 im unteren Getriebegehäuse 20 umfasst vorzugsweise einen in Fig. 4 ersichtlichen Winkelbereich 48 um die Rotationsachse der Abtriebswelle 26 von ca. 180° bis ca. 300°, vorzugsweise mehr als 240°.The recess 28 in the lower gear housing 20 preferably comprises an in Fig. 4 apparent angular range 48 about the axis of rotation of the output shaft 26 of about 180 ° to about 300 °, preferably more than 240 °.

Mit Hilfe eines Zahnrades 38 des Untersetzungsgetriebes 24 kann Öl aus dem unteren Teil des Getriebegehäuses 20 nach oben in eine Auffangwanne 40 gefördert werden, von wo das Öl über einen Kanal 30 in den zweiten Gehäuseteil 20b bis zu einer Lagerung 42 am freien Ende der Abtriebswelle 26 transportiert werden kann. Auf diese Weise ist eine bauraumsparende und energetisch neutrale Pumpe geschaffen, indem ein sich im Ölsumpf drehendes Zahnrad 38 Öl in die Auffangwanne 40 befördert. Das Öl kann von der Auffangwanne 40 durch Schwerkraft in den anderen Gehäuseteil 20b gelangen. Der dadurch erzeugte interne Ölstrom führt zu einer optimalen Temperaturverteilung des Öls im Walzengetriebe 10. Der Ölstand 34 im Getriebe ist durch eine gewellte Linie angezeigt.With the help of a gear 38 of the reduction gear 24, oil from the lower part of the gear housing 20 can be conveyed up into a collecting trough 40, from where the oil via a channel 30 in the second housing part 20 b to a bearing 42 at the free end of the output shaft 26th can be transported. In this way, a space-saving and energetically neutral pump is created by a rotating in the oil sump gear 38 oil transported into the sump 40. The oil can pass from the sump 40 by gravity into the other housing part 20b. The resulting internal oil flow leads to an optimal temperature distribution of the oil in the roller gear 10. The oil level 34 in the transmission is indicated by a wavy line.

Claims (14)

  1. Road milling machine, in particular small milling machine (1), for working road surfaces, with a machine frame (4),
    - with a milling drum (12) supported at the machine frame (4) in a drum casing (2),
    - with a milling drum drive comprising a drum gearbox (10) mounted at the drum casing (2),
    - where the drum gearbox (10) comprises a gearbox housing (20) with a connecting flange (22) for mounting at the drum casing (2), as well as a reduction gearbox (24) and an output shaft (26) for driving the milling drum (12),
    characterized in that
    the gearbox housing (20) comprises, on the underside between the reduction gearbox (24) and the connecting flange (22), a cut-out (28) dividing the gearbox housing (20) and extending radially inwards in such a fashion that the reduction gearbox (24) is arranged in a first housing part (20a) arranged outside of the drum casing (2), and the output shaft (26) is arranged in a second housing part (20b) protruding into the drum casing (2) and having an essentially rotationally symmetrical cross-sectional shape with respect to the output shaft (26)
  2. Road milling machine in accordance with claim 1, characterized in that the reduction gearbox (24) is located entirely inside the first housing part (20a) and that the output shaft (26) extends from the reduction gearbox (24) into the second housing part (20b) located inside the drum casing (2).
  3. Road milling machine in accordance with claim 1 or 2, characterized in that, in the area of the cut-out (28), the distance of the housing wall of the gearbox housing (20) from the output shaft (26) is reduced to a gap permitting the circulation of oil.
  4. Road milling machine in accordance with one of claims 1 to 3, characterized in that, at the underside, the gearbox housing (20) is recessed in a U-shape.
  5. Road milling machine in accordance with one of claims 1 to 4, characterized in that the cut-out (28) in the lower gearbox housing (20) comprises an angular range (48) about the rotational axis of the output shaft (26) of 180° to 300°, preferably more than 240°.
  6. Road milling machine in accordance with one of claims 1 to 5, characterized in that a feeding device in the first housing part (20a) feeds oil into the upper area of the reduction gearbox (24).
  7. Road milling machine in accordance with claim 6, characterized in that the feeding device is comprised of an element of the reduction gearbox (24).
  8. Road milling machine in accordance with claim 6 or 7, characterized in that the feeding device feeds the oil into a collecting reservoir (40) from where the oil is feedable, via at least one channel (30), to the second gearbox part (20b) containing only the output shaft (26).
  9. Road milling machine in accordance with one of claims 6 to 8, characterized in that the feeding device is a gear rotating in the oil sump.
  10. Road milling machine in accordance with one of claims 1 to 9, characterized in that the housing part (20b) protruding into the drum casing (2) features a diameter that is slightly larger than the diameter of the bearing (42) for the output shaft (26).
  11. Road milling machine in accordance with one of claims 1 to 10, characterized in that the outer front end of the milling drum (12) ends nearly flush with the lateral outer side of the machine frame (4), the so-called zero-clearance side, in order to enable milling as close along any obstacles as possible.
  12. Road milling machine in accordance with one of claims 1 to 11, characterized in that the machine frame (4) is supported by a chassis comprising a front axle and a rear axle with wheels (8) or crawler tracks and that the milling drum (12) is arranged between the wheels or crawler tracks of the rear axle.
  13. Road milling machine in accordance with claim 8, characterized in that the wheel or crawler track (8) of the rear axle located on the zero-clearance side can be pivoted from an outer position, in which it is located essentially coaxially to the other wheel or crawler track of the rear axle, to an inner position in front of the milling drum (12) and inwards relative to the zero-clearance side.
  14. Road milling machine in accordance with one of claims 1 to 13, characterized in that a transport device for the milled material worked off by the milling drum (12) discharging towards the rear is arranged behind the milling drum (12) as seen in the direction of travel.
EP14166744.4A 2013-05-10 2014-04-30 Road milling machine, in particular small milling cutter, for machining of road surfaces Active EP2801666B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013208645.8A DE102013208645B4 (en) 2013-05-10 2013-05-10 Device, in particular small milling machine, for processing road surfaces

Publications (2)

Publication Number Publication Date
EP2801666A1 EP2801666A1 (en) 2014-11-12
EP2801666B1 true EP2801666B1 (en) 2016-09-21

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Family Applications (1)

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EP14166744.4A Active EP2801666B1 (en) 2013-05-10 2014-04-30 Road milling machine, in particular small milling cutter, for machining of road surfaces

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US (1) US9249545B2 (en)
EP (1) EP2801666B1 (en)
CN (2) CN104141279B (en)
DE (1) DE102013208645B4 (en)

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DE102013208645B4 (en) * 2013-05-10 2018-01-11 Wirtgen Gmbh Device, in particular small milling machine, for processing road surfaces
US10584450B2 (en) * 2017-03-23 2020-03-10 Caterpillar Paving Products Inc. Rotary mixer
CN107165034A (en) * 2017-07-18 2017-09-15 湖南煜欣轨道装备科技工程有限公司 A kind of milling machine
CN108797229A (en) * 2018-08-01 2018-11-13 赵茂勋 A kind of dredger structure of railway concrete layer
DE102022126637A1 (en) * 2022-10-13 2024-04-18 Kemroc Holding Gmbh Attachment milling unit with cross cutting heads at an angle to each other and output gears with Belevoid toothing

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Publication number Publication date
DE102013208645A1 (en) 2014-11-13
DE102013208645B4 (en) 2018-01-11
EP2801666A1 (en) 2014-11-12
CN204185752U (en) 2015-03-04
US9249545B2 (en) 2016-02-02
CN104141279A (en) 2014-11-12
CN104141279B (en) 2016-06-22
US20140333117A1 (en) 2014-11-13

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