EP2336426B2 - Self-propelled street milling machine - Google Patents

Description

The invention relates to a self-propelled road milling machine according to the preamble of claim 1.

Due to different construction site situations and milling, it may be necessary to adapt the milling tool of a road milling machine to the specific tasks. For example, if a certain surface roughness is to be achieved, a milling drum with a certain line spacing of the milling tools or other tooling is required. In another application, only certain roadway widths are to be expanded, so that a milling drum with a certain working width is needed.

As a rule, a special milling machine must be used in such situations or the machine must be equipped with a milling drum adapted to the task. The replacement of complete milling drums is very complex and requires special tools for mounting or dismounting the milling drum. The adaptation of the milling tool to different requirements is known in the art.

From the WO 01/04422 a road milling machine with a machine frame is known, in which a milling drum is rotatably mounted, wherein the milling drum has a driven by a Fräswalzenantriebseinrichtung via a support gear roller body and alternatively usable, coaxial, on one side of the roller body pushed and interchangeable fixed Fräsrohrelement that on the outer surface Wear cutting tools.

According to this prior art, the reduction gear is provided on the drive side, if always only Fräsrohrelemente the same length to be interchangeable. The disadvantage here is that the reduction gear is arranged in the roller body, whereby the heat generated in the gearbox can not be dissipated and is additionally burdened by the heat generated at the Fräsrohrelementen. If milling tube elements of different lengths are to be used, it is provided according to this prior art according to an alternative design, that the reduction gear is arranged on the opposite side of the drive side, whereby the problem of heat build-up even further, because in addition a drive shaft from the drive side is required to the reduction gear, which rotates at high speed, whereby additional heat is generated and the conditions for heat dissipation is not improved over the former embodiment.

• einen Maschinenrahmen,
• eine am Maschinenrahmen in einem Walzengehäuse angeordnete Fräswalze mit einem Schnellwechselsystem,
• eine Antriebseinrichtung zum Antrieb der Fräswalze,
• ein kinematisch zwischen der Antriebseinrichtung und der Fräswalze angeordnetes Untersetzungsgetriebe,
• wobei die Fräswalze zwischen orthogonal zur Drehachse der Fräswalze verlaufenden Walzengehäusewänden des Walzengehäuses angeordnet ist,
• wobei das Schnellwechselsystem einen Walzengrundkörper und mindestens ein auf den Walzengrundkörper aufschiebbares Fräsrohrelement aufweist,
• wobei die der antriebsseitigen Walzengehäusewand gegenüberliegende Walzengehäusewand zum schnellen Auswechseln von alternativ einsetzbaren Fräsrohrelementen einfach demontierbar ist.

The closest prior art is from the EP-A-1 520 076 known. The self-propelled road milling machine described therein for milling ground surfaces has the following elements:

• a machine frame,
• a milling drum arranged on a machine frame in a roll housing with a quick-change system,
• a drive device for driving the milling drum,
• a reduction gear arranged kinematically between the drive device and the milling drum,
• wherein the milling drum is disposed between roll housing walls of the roll housing extending orthogonally to the axis of rotation of the milling drum,
• wherein the quick-change system has a roller base body and at least one milling tube element which can be pushed onto the roller body,
• wherein the drum housing wall opposite the drive-side roller housing wall for quick replacement of alternatively usable Fräsrohrelementen is easy to disassemble.

According to this prior art, the reduction gear is arranged on the drive side between the roller base body and the drive-side side plate of the roller box and connected to this only via an end face. The disadvantage here is that the support of the reaction forces must be done via a small lever arm. The connection on the front side is therefore necessary because the transmission is designed as a planetary gear with rotating housing. In addition, the transmission should have the smallest possible diameter, thereby simultaneously increasing the length of the transmission. The disadvantage here is that the mechanical connection between the roller body and the reduction gear is shifted in the range of the largest bending moments, wherein the lever arm for transmitting the bending moments due to the small gear diameter is small, resulting in high forces on the connecting elements. Other disadvantages are that the maximum possible cutting depth is limited, and that the reduction gear is exposed to high thermal loads, because the reduction gear is either surrounded by an additional protective tube, or by a Fräsrohrelement. The heat load and the reduced bending stiffness lead to a higher wear of the elements.

The invention has for its object to provide a self-propelled road milling machine, in which in a milling tube quick-change system improved heat dissipation and less wear and increased rigidity can be possible.

To solve this problem serve the features of claim 1.

It is inventively provided that the housing of the reduction gear between the drive device and the drive-side roller housing wall within the machine frame is rotatably mounted on the machine frame, wherein the reduction gear comprises a planetary gear.

• Die Anordnung des Untersetzungsgetriebes auf der antriebsseitigen Seite der Walzengehäusewand ermöglicht eine bessere Wärmeabfuhr und damit eine geringere Verschleißanfälligkeit des Untersetzungsgetriebes. Zusätzlich wird das Gehäuse des Untersetzungsgetriebes nicht durch das Fräsgut beschädigt, so dass kein Schutzmantel für das Untersetzungsgetriebe erforderlich ist, der auch die Wärmeabfuhr zusätzlich behindern würde. Da das Gehäuse des Untersetzungsgetriebes steif und drehfest an dem Maschinenrahmen befestigt werden kann, ist der Walzengrundkörper besser abgestützt, so dass eine höhere Steifigkeit des Fräsrohrwechselsystems erreicht werden kann.

The invention leads to significant improvements for a milling tube quick-change system:

• The arrangement of the reduction gear on the drive side of the roll housing wall allows better heat dissipation and thus a lower susceptibility to wear of the reduction gear. In addition, the housing of the reduction gear is not damaged by the milled material, so that no protective jacket for the reduction gear is required, which would also hinder the heat dissipation. Since the housing of the reduction gear can be rigidly and non-rotatably attached to the machine frame, the roller body is better supported, so that a higher rigidity of the Fräsrohrwechselsystems can be achieved.

The higher stiffness is achieved in that the transmission is stationary and can be repeatedly attached to the machine frame over its length, so that the reduction gear can absorb better due to its rigid attachment of the milling drum forces.

Due to the immediate, fixed attachment of the housing of the reduction gear to the machine frame, the housing is actively cooled, e.g. via an oil cooling, so that the reduction gear is more resilient and more powerful and the dimensions of the reduction gear, in particular its diameter, can be reduced. Due to the active cooling also the wear of the reduction gear can be minimized. A smaller diameter of the reduction gear allows a greater depth of cut.

It is preferably provided that the housing of the reduction gear outside the roller housing is non-rotatably attached to the machine frame. The arrangement outside the roll housing has the advantage that the reduction gear is better accessible for maintenance. The reduction gear is not exposed to the superheated atmosphere in the roller box or within the roller body and is thus not additionally thermally stressed. In addition, no protective devices are required to mechanically protect the reduction gear from the sharp-edged milled material.

In a preferred embodiment, the reduction gear on the side facing the roller housing wall on an output member which supports the free end of the roller body and drives the roller body. The driven element can rigidly support the drive-side free end of the roller body, so that the free end does not have to be stored in the drive-side roller housing wall.

The roller body can be passed through a labyrinth seal through the drive-side roller housing wall and the free drive-side end of the roller body to be rotatably connected to the output element. The labyrinth seal prevents dust and heat from escaping outward from the roll housing, without the passage of the roll body through the roll housing wall causing friction losses.

The roller body can be mounted in an embodiment on the one hand on the reduction gear facing the end in the reduction gear in a fixed bearing and on the other hand detachably in the removable roller housing wall of the roller housing in a floating bearing. In this way, the fixed bearing is provided on the mechanically stiffer side, so that overall the rigidity of the milling tube quick-change system can be improved and a statically determined storage is realized, which can compensate for thermally induced and production-related differences in length.

Between the milling tube element and the roller housing wall, conveying blades (kicker plates) can preferably be fastened on the roller base body, distributed uniformly over the circumference. The conveyor blades cause ejection of the material to be milled through the outlet opening in the roller housing when the width of the Fräsrohrelementes is less than the width of the roller housing. Preferably, at least the lower edge of the drive-side roller housing wall protrudes slightly further down to the ground surface than the housing of the reduction gear. As a result, an effective protection for the reduction gear is provided because the lower edges limit the maximum milling depth, so that the reduction gear can not be damaged.

The replaceable Fräsrohrelemente are preferably in one piece.

The roll housing has, in a wall running parallel to the axis of rotation of the milling drum, the discharge opening for the milled material.

The diameter ratio between the reduction gear and the cutting circle of the tools of the Fräsrohrelementes is in a preferred embodiment in the range less than 0.45, preferably less than 0.4, for example in the range between 0.35 and 0.45, preferably in the range between 0, 38 and 0.42. If the roller body and the reduction gear can be manufactured with a small diameter in relation to the milling tube elements, the maximum possible cutting depth increases, whereby the application range of the road milling machine can be considerably extended and special machines can be dispensed with.

Below the housing of the reduction gear ground-parallel wear elements may be preferably arranged orthogonal and / or parallel to the axis of rotation of the milling drum, which are supported on the machine frame, or on the gearbox. Through these wear elements, such as carbide strips, the reduction gear can also against contact with the Soil surface or protected with objects located on the ground surface. The wear elements are preferably arranged in the direction of travel in front of the reduction gear and fastened slightly lower than the lower edge of the reduction gear.

In Fräsrohrelementen having a milling width of more than half of the maximum milling width, in addition, a support ring may be arranged on the roller base body, on which the Fräsrohrelement is pushed. Such support rings are from the EP-A-1 840 268 known.

The drive means with a belt drive may project outwardly relative to the machine frame, the housing of the reduction gear between a pulley of the belt drive and the drive-side roller housing wall of the roller housing is mounted outside of the roller housing. The pulley and the entire belt drive can withstand the outside wall of the road milling machine to the outside.

The drum housing wall opposite the drive-side roller housing wall is arranged on the zero side of the machine for rapid replacement of alternatively usable milling tube elements, on which the milling drum rests approximately flush with an end face on the longitudinal side of the machine frame, in order to enable edge-near milling.

The reduction gear may comprise or consist of a planetary gear.

In the following, embodiments of the invention will be explained in more detail with reference to the drawings.

Fig. 1

eine selbstfahrende Straßenfräsmaschine,

Fig. 2

das erfindungsgemäße Fräsrohr-Schnellwechselsystem, und

Fig. 3

das erfindungsgemäße Fräsrohr-Schnellwechselsystem mit einem breiteren Fräsrohrelement.

Show it :

Fig. 1

a self-propelled road milling machine,

Fig. 2

the milling tube quick-change system according to the invention, and

Fig. 3

the milling tube quick-change system according to the invention with a wider Fräsrohrelement.

In Fig. 1 a road milling machine 1 is shown, in which the milling tube quick-change system described below can be used. Road milling machines generally consist of a machine frame 2 on which an internal combustion engine and a control station are mounted. The self-propelled road milling machine has height-adjustable, mounted on the machine frame 2 lifting columns 3, on which support wheels (not shown in the figure) or chain drives 5 are mounted.

The milling drum 4 is located under the machine frame 2 in a roller housing 11, which is bounded laterally by the roller housing walls 12,13. The processed from the milling drum 4 material is dropped in a conventional manner by an ejection opening 24 on a first conveyor belt 7a and 7b further transported to a second, height-adjustable and pivotable conveyor belt.

The milling drum 4 is rotatably arranged between roller housing walls 12, 13 of the roller housing 11 extending orthogonally to the axis of the milling drum 4 and is driven via a drive device 6 and a reduction gear 8.

The reduction gear 8 is fixed to the roller housing 11 at an upper end wall, wherein the roller housing 11 in turn is attached to the machine frame 2.

The milling drum 4 has a roller body 14 coupled to the reduction gear 8 and at least one integral milling tube element 10, which is interchangeably mounted coaxially on the roller body 14. The roller main body 14 is arranged axially next to the reduction gear 8. The roller main body 14 transmits the torque of the reduction gear 8 to the respective Fräsrohrelement 10.

Alternatively usable Fräsrohrelemente 10 different milling width and different tooling are available for different roadworks and can be replaced quickly.

For Fräsrohrelementen 10, which have a milling width of more than half of the maximum milling width, an in Fig. 3 illustrated demountable support ring 50 according to EP 1 840 268 be arranged for radial support of the replaceable Fräsrohrelementes 10 on the roller body 14 to which the Fräsrohrelement 10 can be pushed and on which the Fräsrohrelement 10 can slide in the manner of a floating bearing.

Fig. 2 shows an embodiment in which the drive means 6 is coupled to the reduction gear 8 via a pulley 30. In Fig. 2 only the pulley 30 of a belt drive 28 is shown as part of the drive device 6. The pulley 30 and the entire belt drive 28 can withstand the outside wall 56 of the road milling machine 1 to the outside. The internal combustion engine drives this pulley 30, for example via a compound V-belt.

The reduction gear 8 is stationary with a housing 9, rotationally fixed and rigidly fixed to the machine frame 2 via two spaced brackets 2a, 2b. The housing 9 extends as shown Fig. 2 can be supplied in the axial extension of the milling drum 4 within the outer walls 56 of the machine frame 2. Via a port 42 of the housing 9 oil for cooling the reduction gear 8, which emerges at an outlet 44 again and can be fed to a heat exchanger in a circuit. On the pulley 30 opposite side, an output member 16 is arranged, which is connected to the roller body 14 via a connecting flange 15 and drives this. Preferably, the output member 16 is coaxial and rotatably connected to the roller body 14. The output element 16 forms the fixed bearing for the drive-side free end of the roller body 14. The roller body 14 is passed through a labyrinth seal 19 through the drive-side roller housing wall 12, which forms a barrier to dust and heat.

The other end of the roller body 14 is mounted in a movable bearing 46 in the drive-side roller housing wall 12 opposite roller housing wall 13. The roll housing wall 13 is arranged on the neutral side of the road milling machine 1, which marks the side in which a near-edge milling is possible. The easily removable roll housing wall 13 is preferably pivotable, but may alternatively be axially removable.

The attachment of the roller body 14 on the drive side of the fixed bearing forming output member 16 ensures a high rigidity of the construction, since the connection of the two elements 14,16 takes place at a point of lowest bending load, because the reduction gear 8 rigidly to the machine frame 2 and the roller housing 11 can be attached.

On the null side, the distance from the front edge of the milling drum 4 to the outer wall 56 of the road milling machine 1, z. B. the roll housing wall 13, kept as low as possible.

The Fräsrohrelement 10 is equipped, for example, with chisels 17 whose engagement circle or cutting circle 26 in Fig. 2 is indicated by the dashed line. The maximum milling depth FT is indicated relative to a further dashed line below the roller housing walls 12, 13 at the lower edges 20a, 20b. The diameter ratio between the reduction gear 8 and the cutting circle 26 of the tools 17 of the Fräsrohrelementes 10 is preferably in the range of less than 0.45, preferably less than 0.4, wherein the diameter of the reduction gear can not fall below certain minimum dimensions. The diameter ratio may for example be between 0.35 and 0.45, preferably in the range between 0.38 and 0.42.

Between the Fräsrohrelement 10 and the drive-side roller housing wall 12 Förderschaufein 18 on the roller base 14 preferably distributed uniformly on the circumference be fastened, with the help of the milled material are easier ejected from the discharge opening 24 when the Fräsrohrelement 10 has a smaller width than the roller housing 11 ,

Underneath the housing 9 of the reduction gear 8, preferably several wear elements, e.g. Scraper 40, for example, be orthogonal and / or parallel to the axis of rotation of the milling drum 4 arranged parallel to the ground, which are supported on the machine frame 2 and protect the housing 9 from damage. The lower edges of the scrapers 40 extend at the level of the lower edge 20b of the roller housing wall 12th

If a change of the Fräsrohrelementes 10 due to another task in the milling required, this change can be performed quickly by first the roller housing wall 13 is dismantled or pivoted.

Then, the glands between the Fräsrohrelement 10 and the annular flange 36 of the roll base 14 must be removed, after which the entire Fräsrohrelement 10 can be deducted from the null side. Subsequently, when the Fräsrohrelement 10, for example, for reasons of wear, is replaced, a similar Fräsrohrelement 10 or another type Fräsrohrelement same or different milling width, z. B. for fine milling, be postponed again. In a milling tube element 10 of greater width, if necessary, an additional support ring 50 for radial support on the roller body 14 as in Fig. 3 be mounted shown.

When changing the Fräsrohrelementes 10, both the reduction gear 8 and the roller base 14 can remain unchanged, while the Fräsrohrelemente 10 can be axially assembled or disassembled from the neutral side. Access from the drive side is not required.

The embodiment of Fig. 2 shows a Fräsrohrelement 10 with short milling width, which is bolted to the roller base body 14 only about one of the Fräsrohrelement 10 radially projecting connecting flange 35 and attached to the roller base 14 annular flange 36.

The embodiment of Fig. 3 shows a Fräsrohrelement 10 with a larger milling width than in Fig. 2 shown, the one from the EP 1 840 268 has known support ring 50 with a mounted on the roller body 14 support ring receptacle 52 and a welded to the inside of the Fräsrohrelementes support ring element 54. The support ring receptacle 52 may consist of a multi-part ring which can be mounted on the roller body 14. In this case, the support ring receptacle 52 can also be mounted axially movably on the roller base body 14.

It is particularly advantageous that only the Fräsrohrelement 10 must be replaced. The reduction gear 8 and the roller body 14 remain unchanged relative to the drive device 6, so that no adjustment of the drive train is required. The Fräsrohrelement 10 is automatically centered by its seat on the roller base 14 and its storage in the output member 16 of the reduction gear 8, which in particular imbalances are avoided. The easily releasable attachment means of Fräsrohrelementes 10 are protected from contamination and damage.

Claims (14)

1. Automotive road milling machine (1) for milling ground surfaces (3), with

   - a machine frame (2),

   - a milling drum (4) with a quick-change system arranged at the machine frame (2) in a drum housing (11),

   - a driving device (6) for driving the milling drum (4),

   - a reduction gear (8) acting between the driving device (6) and the milling drum (4),

   - where the milling drum (4) is arranged between drum housing walls (12,13) of the drum housing (11) running orthogonally to the axis of rotation of the milling drum (4),

   - where the quick-change system is provided with a basic drum body (14) and at least one milling tube element (10) capable of being pushed onto the basic drum body (14),

   - where the drum housing wall (13) opposite the drive-side drum housing wall (12) is easily removable for the quick exchange of alternatively usable milling tube elements (10),

   characterized in that
   the housing (9) of the reduction gear (8) is attached to the machine frame (2) in a torsionally rigid fashion, inside the machine frame (2), between the driving device (6) and the drive-side drum housing wall (12),
   wherein the reduction gear (8) is provided with a planetary gear (8).
2. Automotive road milling machine in accordance with claim 1, characterized in that the housing (9) of the reduction gear (8) is attached to the machine frame (2) in a torsionally rigid fashion outside the drum housing (11).
3. Automotive road milling machine in accordance with claim 1 or 2, characterized in that the reduction gear (8) is provided, on the side facing the drive-side drum housing wall (12), with an output element (16) in which the free end of the basic drum body is mounted and which drives the basic drum body (14).
4. Automotive road milling machine in accordance with claim 3, characterized in that the basic drum body (14) is passed through the drive-side drum housing wall (12) via a labyrinth seal (19) and that the free drive-side end of the basic drum body (14) is connected to the output element (16) in a torsionally rigid fashion.
5. Automotive road milling machine in accordance with claim 1 to 4, characterized in that the basic drum body (14) is mounted on the one hand, at the end facing the reduction gear (8), in the reduction gear (8) in a fixed-type bearing, and on the other hand, in a detachable fashion, in the removable drum housing wall (13) of the drum housing (11) in a floating-type bearing.
6. Automotive road milling machine in accordance with one of the claims 1 to 5, characterized in that between the milling tube element (10) and the drive-side drum housing wall (12), conveying blades (18) are attachable to the basic drum body (14) in a preferably regular fashion on the circumference.
7. Automotive road milling machine in accordance with one of the claims 1 to 6, characterized in that at least the lower edge (20b) of the drive-side drum housing wall (12) projects slightly further downward to the ground surface (3) than the housing (9) of the reduction gear (8).
8. Automotive road milling machine in accordance with one of the claims 1 to 7, characterized in that the interchangeable milling tube elements (10) are of integral design.
9. Automotive road milling machine in accordance with one of the claims 1 to 8, characterized in that the drum housing (11) is provided with a discharge opening (24) in a wall (22) running parallel to the axis of rotation of the milling drum (4).
10. Automotive road milling machine in accordance with one of the claims 1 to 9, characterized in that below the housing (9) of the reduction gear (8), wear elements (40) are arranged parallel to the ground and preferably orthogonally and/or parallel to the axis of rotation of the milling drum (4), said wear elements resting at the machine frame (2).
11. Automotive road milling machine in accordance with one of the claims 1 to 10, characterized in that the diameter ratio between the reduction gear (8) and the cutting radius (26) of the milling tools (17) of the milling tube element (10) is in the range smaller than 0.45, preferably in the range smaller than 0.4.
12. Automotive road milling machine in accordance with one of the claims 1 to 11, characterized in that, with milling tube elements (10) being provided with a milling width of more than half of the maximum milling width, a support ring (50) is arranged on the basic drum body (14) that the milling tube element (10) is capable of being pushed onto.
13. Automotive road milling machine in accordance with one of the claims 1 to 12, characterized in that the driving device (6) with a belt drive (28) projects outward relative to the machine frame (2), and that the housing (9) of the reduction gear (8) is attached, outside the drum housing (11), between a belt pulley (30) of the belt drive (28) and the drive-side drum housing wall (12) of the drum housing (11).
14. Automotive road milling machine in accordance with one of the claims 1 to 13, characterized in that, for the quick exchange of alternatively usable milling drum tubes (10), the drum housing wall (13) opposite the drive-side drum housing wall (12) is arranged on the zero-clearance side of the machine (1), on which the milling drum (4), with a front end, rests more or less flush at the side of the machine frame (2) to enable milling close to the edge.

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