DE102021110943A1 - ASSEMBLY WITH A PIVOT DRIVE AND A QUICK COUPLER, AND WORKING MACHINE WITH SUCH AN ASSEMBLY - Google Patents

Abstract

Assembly with a swivel drive (1), on the housing (3) of which there are one or two connections, each for a hydraulic line (19), and a quick coupler (2) which is connected indirectly to the drive shaft (6) via a flange attachment (11). of the swivel drive (1) and has one or two inlet openings (8). Between the connection (4) or the connections (4) and the inlet opening (8) or the inlet openings (8) there is in each case a hydraulic connection with a first section which is formed by a channel running around or in the housing (3). is, and a second portion, which is formed by a flexible hose (9).

Description

The invention relates to an assembly with a swivel drive and a quick coupler, as from DE 20 2010 108 347 U1 is known, and a machine with such an assembly.

Working machines, in particular for construction, agriculture or forestry, generally have an articulated boom that can be extended and articulated on a vehicle, with a free end to which various attachments can be attached. As a result, a very wide range of applications can be achieved with just one machine.

In order to be able to change tools as quickly and easily as possible, the free end of the boom is often equipped with a quick-change device. On the tool side, quick couplers have suitable tool holders, in which attachment means for the attachment tools can be accommodated and fastened.

To attach the attachment tools, the tool holders or at least parts of the tool holders of the quick coupler are designed to be adjustable and movable. The tool holders can be moved in different ways, e.g. mechanically, hydraulically, electrically or in combination. The movement is carried out particularly advantageously by hydraulic drives, since most working machines are usually already operated hydraulically themselves. The drives enable the machine operator to change tools without having to leave the driver's cab, which means that a tool change can be carried out quickly and easily.

On many work machines, the quick coupler is permanently attached directly to the free end of the boom, as in 1 shown, so that an attachment tool mounted thereon can be pivoted in a horizontal orientation of the vehicle in a first pivoting direction in a vertical working plane (drawing plane). With this, for example, an excavator bucket can be swiveled in such a way that first, to pick up bulk material or similar, the free bucket edge is pushed into or under the bulk material or similar to be picked up and then, for transport, all edges limiting the capacity of the bucket are pushed into a vertical plane ( perpendicular to the plane of the drawing). For this purpose, the free end of the cantilever is often designed in such a way that a rotatable deflection lever is attached to a main arm and a free end of the main arm and a free end of the deflection lever together form the free end of the cantilever. The excavator shovel, or generally the attachment, is pivoted in the first pivoting direction by hydraulic activation of the reversing lever.

In this case, one or two hydraulic lines required for hydraulic actuation of the quick coupler are routed along the boom from a hydraulic source, which is usually located in the vehicle, to the free end of the boom, where they each have an outlet opening that is opened when the quick coupler is installed on the boom , be connected pressure-tight to the inlet openings on the quick coupler. Since the quick coupler is pivoted opposite on the boom, the length of the hydraulic lines is dimensioned such that they have a freely movable section adjacent to the outlet openings, which tolerates the change in position of the inlet openings relative to the boom. Since the change in position is only a shift in one plane, the freely movable sections of the hydraulic lines are not twisted. Also, the distance between the inlet openings and a pivot point on the boom around which the quick coupler is pivoted changes at most insignificantly, so that there are no significant protuberances of the freely movable sections of the hydraulic lines.

The relative movement of the inlet openings of the quick coupler in relation to the boom is completely different if this is not directly connected to the boom, but rather indirectly via a hydraulic swivel drive. Such a connection of the quick coupler to the boom enables an additional pivoting movement of the attachment tool, with which it can be moved in a working plane that is tilted to the vertical working plane. This can be desirable with an excavator if, for example, a sloping surface is to be created by removing soil. When set up horizontally, the attachment can then not only be swiveled in a vertical plane, but also swiveled laterally with respect to this plane. Lateral pivoting angles of +/- 25° to +/- 90°, starting from the vertical plane, are usual, i.e. the pivoting range is usually 50° to 180°. If one adhered to the known principle of direct connection of one or two hydraulic lines to the inlet openings present on the quick coupler, the one or two hydraulic lines would protrude considerably. In 2a two hydraulic lines shown in a relative position to the boom, in which the quick coupler is swiveled out by - 90°. In 2 B , he quick coupler is not swung out and in 2c , the quick coupler is swiveled out by + 90°. While the hydraulic lines are at a swivel angle of - 90° around the housing of the swivel drive snuggly, when pivoted by 180°, they form increasingly larger protuberances moving away from the housing of the rotary drive, which could lead to them getting caught somewhere and tearing off during the working process.

In the DE 20 2010 018 347 U1 discloses a swivel drive (called a hydraulic rotary drive there) in which the fluid is guided completely within the swivel drive. The rotary drive has an elongate housing with a housing side wall and two housing ends. The housing is fastened to the boom using two fastening brackets. An elongate drive shaft is disposed coaxially within the housing and is hydraulically driven and rotatable relative to the housing. Circumferential channels are formed on a flange section of the drive shaft adjoining one of the ends of the housing and are sealed in a pressure-tight manner with respect to one another and with respect to the housing by means of seals. Two hydraulic lines connected to a source of pressurized fluid are fluidically connected to the peripheral channels via two connections in the housing, which in turn are connected to pipelines that are routed through the drive shaft and a fastening flange firmly connected to the drive shaft, on which the quick coupler is mounted. This establishes a fluidic connection between the outlets of the flexible hydraulic lines and the quick coupler, which is established entirely within the swivel drive and the mounting plate.

A disadvantage is the great technical complexity for sealing the drive shaft in particular with respect to the housing and the associated susceptibility to faults. The assembly of the swivel drive is also comparatively much more complicated.

The object of the invention is to find a practicable, technically simpler solution for the fluidic coupling between the connections present on the assembly and the quick coupler for an assembly with a swivel drive and a quick coupler.

It is also the object of the invention to further develop a working machine with an assembly comprising a swivel drive and a quick coupler, which has a practicable, technically simpler solution for the fluidic coupling between the connections present on the assembly and the quick coupler.

The object is achieved for an assembly with a swivel drive and a quick coupler, with the swivel drive having an elongated housing and a connection or two connections arranged next to one another, each for a hydraulic line. The connection or the connections are arranged in a position relative to the housing that cannot be changed. This is located at a swivel angle of 0° on a side of the housing facing away from the quick coupler. A drive shaft is mounted coaxially and rotatably in the housing. It has at least one end on a mounting flange that is firmly connected to the quick coupler. An inlet opening or two inlet openings arranged next to one another are present on the quick coupler. Whether there are one or two connections and one or two inlet openings depends on whether there are one or two hydraulic connections for operating the quick coupler.

The design of the hydraulic connections, which is the same for two hydraulic connections, is essential to the invention. A first portion of each of the hydraulic connections is formed by a duct running around or within the housing and a second portion of each of the hydraulic connections is formed by a flexible hose.

Advantageously, an interface between the first section and the second section of each of the hydraulic connections at the swivel angle of 0° has the smallest possible relative distance to the inlet opening, based on a changing relative distance of the interface to the inlet opening (8) at a swivel angle that is unequal 0°.

Each of the channels is advantageously formed by a pipe or hose arranged around the housing and fixed to the housing, and the connection is arranged at one end of the pipe or hose.

Alternatively, there is a flanged lug adjacent one end of the housing, each of the ports is located on the flanged lug, and each of the channels is formed by a tube extending in the flanged lug.

For ease of manufacture, each of the tubes is formed by a plurality of intersecting drill holes.

In the case of two channels, in the form of pipes, tubes or hoses, these are advantageously arranged mirror-symmetrically to one another.

The object is achieved for a working machine with a vehicle and a boom on which a subassembly with a swivel drive and a quick coupler is attached, in that the subassembly is designed according to the invention.

The working machine is advantageously an excavator.

• 1 ein unmittelbar an einem Ausleger montierter Schnellwechsler gemäß dem Stand der Technik,
• 2a - 2c eine aus der Stand der Technik ableitbare Lösung für die fluidische Verbindung eines über einen Drehantrieb mittelbar mit einem Ausleger verbundenen Schnellwechslers,
• 3a eine erste Seitenansicht eines ersten Ausführungsbeispiels einer erfindungsgemäßen Baugruppe bei einem Schwenkwinkel von 0°,
• 3b eine perspektivische Ansicht von unten des ersten Ausführungsbeispiels bei einem Schwenkwinkel vom - 90°,
• 3c der Flanschansatz des ersten Ausführungsbeispiels in einer Draufsicht,
• 3d der Flanschansatz des ersten Ausführungsbeispiels in einer Seitensicht,
• 4a eine erste Seitenansicht eines zweiten Ausführungsbeispiels einer erfindungsgemäßen Baugruppe bei einem Schwenkwinkel von 0°,
• 4b eine zweite Seitenansicht des zweiten Ausführungsbeispiels bei einem Schwenkwinkel von - 90°und
• 4c die Rohre des zweiten Ausführungsbeispiels.

The invention is explained in more detail below using an exemplary embodiment with the aid of drawings. Here show:

• 1 a prior art boom-mounted quick coupler,
• 2a - 2c a solution that can be derived from the prior art for the fluidic connection of a quick coupler that is indirectly connected to a boom via a rotary drive,
• 3a a first side view of a first embodiment of an assembly according to the invention at a pivot angle of 0 °,
• 3b a perspective view from below of the first embodiment at a pivot angle of - 90 °,
• 3c the flange attachment of the first embodiment in a plan view,
• 3d the flange attachment of the first embodiment in a side view,
• 4a a first side view of a second embodiment of an assembly according to the invention at a pivot angle of 0 °,
• 4b a second side view of the second embodiment at a pivot angle of - 90 ° and
• 4c the tubes of the second embodiment.

A first embodiment of an assembly according to the invention, shown in the 3a - 3d , has a swivel drive 1 and a quick coupler 2 connected to it. The swivel drive 1 contains an elongate housing 3 and two connections 4, each for a hydraulic line 19, which is connected to one of the connections 4 at a first end and to a pressurized fluid source (not shown) at a second end. The connections 4 are arranged in an unchangeable position relative to the housing 3 . With a swivel angle α of 0°, the connections 4 are arranged next to one another on a side 5 of the housing 3 facing away from the quick coupler 2 . In this first exemplary embodiment, the unchangeable relative position is given by the fact that the connections 4 are advantageously arranged on the housing 3, more precisely on a flange attachment 11 forming one end of the housing.

In the housing 3, a drive shaft 6 is mounted coaxially and rotatably. It is preferably driven hydraulically, but could just as well be driven electrically, for example. It has at least one end on a mounting flange 7, with which the quick coupler 2 is firmly connected. There are two inlet openings 8 arranged next to one another on the quick coupler 2 . Between the connections 4 and the inlet openings 8 there is in each case a hydraulic connection which, according to the invention, has a first and a second section. For all exemplary embodiments of an assembly according to the invention, the respective first section of the hydraulic connections is formed by a channel running around or in the housing 3 and the respective second section of the hydraulic connections is formed by a flexible hose 9 . Hydraulic fittings are attached to the ends of the flexible hoses 9 by means of which the flexible hoses are connected in a pressure-tight manner to an outlet opening 16 of one of the channels and to one of the inlet openings 8 . In this first embodiment, the channels are formed by tubes running in the housing 3, more precisely in the flange 11 of the housing 3, as in FIG 3c you can see.

An interface 13 between the first section and the second section of the hydraulic connection has, as in 3a shown, has the smallest possible relative distance to the inlet openings 8 at the swivel angle α of 0°, based on the relative distances of the interfaces 13 to the inlet openings 8 at a swivel angle α not equal to 0°, as in FIG 3b , is shown at a swivel angle α of -90°.

In 3a it can be seen in particular how the two flexible hoses 9 are arranged in an intermediate space between the housing 3 and the quick coupler 2 . They form two identical loops 14 arranged next to one another. Due to a preferably mirror-symmetrical arrangement of the connections 4 and the inlet openings 8 with respect to a plane (drawing plane) running through the geometric axis of the drive shaft 6, with a pivoting angle α of 0°, the two loops 14 are located parallel to the geometric axis of the drive shaft 6 well protected, centrally between the housing 3 and the quick coupler 2.

If the drive shaft 6 is rotated and the quick coupler 2 is thus pivoted in one direction of rotation, the loops 14 become increasingly, almost equally smaller, and an increasing section of the flexible hoses 9 comes into contact with the housing 3 . In 3b is the quick coupler 2 by - 90 ° pivoted, the loops 14 have reached their shortest length and the am Housing 3 applied section has its greatest length. During pivoting, the loops 14 always remain at least largely protected in the middle between the housing 3 and the quick coupler 2, and during pivoting within the pivoting range, the flexible hoses 9 do not protrude in any pivoting angle position.

In the 3c and 3d only the flange extension 11 is shown. The channels running in the flange extension 11 are represented by dashed lines and each open into an inlet opening 15 and an outlet opening 16. In principle, the tubes can run anywhere between the respectively associated inlet opening 15 and the respectively associated outlet opening 16. As shown here, they are advantageously arranged mirror-symmetrically to one another.

Advantageously from a manufacturing point of view, they are produced by drilling, as a result of which they are inevitably formed by a number of intersecting boreholes. Five drill holes 12.1, 12.2, 12.3, 12.4, 12.5 are sufficient for producing one of the tubes. The first borehole 12.1 ends below the inlet opening 15 and the third borehole 12.3 ends below the outlet opening 16. The second borehole 12.2 crosses the first borehole 12.1 and opens into the third borehole 12.3, with which the three boreholes 12.1, 12.2, 12.3 are fluidically connected . In order to form a tube connecting the inlet opening 15 and the outlet opening 16, the three boreholes 12.1, 12.2, 12.3 are closed by sealing plugs (not shown) up to the respectively assigned intersections and the first borehole 12.1 is connected to the inlet opening 15 via the fourth borehole 12.4 and the The third borehole 12.3 is connected to the outlet opening 16 via the fifth borehole 12.5. The fourth and fifth borehole 12.4, 12.5 advantageously have a larger diameter than the other three boreholes 12.1, 12.2, 12.3, which is suitable on the one hand for attaching the connection 4 in a pressure-tight manner and on the other hand is suitable for a pressure-tight connection with the flexible produce hose 9 . By forming the tubes by means of the boreholes 12, a pressure-tight channel can be produced between the inlet opening 15 and the outlet opening 16 in a simple manner. Only the mentioned sealing plugs are required for this, which, in contrast to some seals of an assembly of the aforementioned prior art, are not exposed to any dynamic stress.

For the first exemplary embodiment shown, the swivel range is 180°, ie the drive shaft 6 can be rotated through a swivel angle of 0° by +/- 90°. The swivel angle α can be made smaller or larger, only the length of the flexible hoses 9 has to be adjusted accordingly. The two flexible hoses 9 then only form shorter or longer loops 14 which remain protected, largely between the housing 3 and the quick coupler 2, regardless of the swivel angle range.

A second embodiment shown in FIGS 4a until 4c , differs from the first exemplary embodiment in that the two channels are each formed by a tube 10 arranged around the housing 3 and fixed to the housing 3 and the connections 4 each at one end, which represents an inlet opening 17, of one of the tubes 10 are arranged. The connections 4 are each formed here, for example, by a hydraulic fitting. A hydraulic fitting, which is connected to one of the flexible hoses 9, is also attached to the respective other ends of the tubes 10, which each represent an outlet opening 18.

A third exemplary embodiment, not shown in the figures, differs from the second exemplary embodiment in that the two pipes 10 are hoses or are each part of the flexible hoses 9 .

In each of the exemplary embodiments shown, there are two hydraulic connections to the quick coupler, with which the attachment tool is coupled and uncoupled hydraulically in the tried and tested manner. Occasionally, the effect of mechanical energy stores means that coupling or decoupling occurs when there is a pressure reduction, so that only one hydraulic line has to be routed to the quick coupler. In this case, the exemplary embodiments shown can be transferred, although they are simplified to just one hydraulic connection.

Compared to the prior art, an assembly according to the invention is simpler to manufacture and assemble and is more robust. The sealing of the hydraulic connections between one of the connections 4 and the inlet openings 8 is simpler and less stressed during operation of the assembly, which is why leakage is comparatively better avoided. In addition, the overall length of the assembly for the storage of the drive shaft can be used without restriction.

The assembly according to the invention is advantageously a component of a work machine, not shown in the drawings, with a vehicle and a boom to which the assembly is attached. The working machine includes a pressurized fluid source, which is preferably arranged in the vehicle and to which one of the two hydraulic lines 19 is alternately connected, e.g. via a two-way valve, each of which is connected to one of the connections 4 connected to the assembly. The working machine is advantageously an excavator.

reference list

1

slewing drive

2

quick coupler

3

Housing

4

connection

5

opposite side

6

drive shaft

7

mounting flange

8th

intake port

9

flexible hose

10

Pipe

11

flange approach

12

borehole

13

interface

14

loop

15

inlet opening (at the flange neck)

16

outlet opening (on the flange shoulder)

17

inlet opening (on the pipe)

18

outlet opening (on the pipe)

19

hydraulic line

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 202010108347 U1 [0001]
• DE 202010018347 U1 [0008]

Claims (8)

Assembly with a swivel drive (1) and a quick coupler (2), the swivel drive (1) having an elongated housing (3) and a connection (4) or two connections (4) arranged next to one another, each for a hydraulic line (19). , which are arranged in an unchangeable relative position to the housing (3), at a pivot angle (α) of 0°, on a side (5) of the housing (3) facing away from the quick coupler (2) and in the housing (3 ) a drive shaft (6) is mounted coaxially and rotatably, which has a fastening flange (7) on at least one end, with which the quick coupler (2) is firmly connected, with the quick coupler (2) having an inlet opening (8) or two next to each other arranged inlet openings (8) are present and there is a hydraulic connection between the connection (4) or the connections (4) and the inlet opening (8) or the inlet openings (8), characterized in that a first section of each of the hydraulically en connections is formed by a channel running around or in the housing (3) and a second portion of each of the hydraulic connections is formed by a flexible hose (9). Assembly with a swivel drive (1) and a quick coupler (2). claim 1 , characterized in that an interface (13) between the first section and the second section of each of the hydraulic connections at the pivot angle (α) of 0° has a smallest possible relative distance to the inlet opening (8), based on a changing relative distance the interface (13) to the inlet opening (8) at a pivot angle not equal to 0 °. Assembly with a swivel drive (1) and a quick coupler (2). claim 1 or 2 , characterized in that each of the channels is formed by a pipe (10) or hose arranged around the housing (3) and fixed to the housing (3) and the connection (4) at one end of the pipe (10) or hose is arranged. Assembly with a swivel drive (1) and a quick coupler (2). claim 1 or 2 , characterized in that there is a flanged boss (11) adjacent one end of the housing (3), each of the ports (4) being located on the flanged boss (11), and each of the channels passing through a passage in the flanged boss (11). tubes is formed. Assembly with a swivel drive (1) and a quick coupler (2). claim 4 , characterized in that each of the tubes is formed by a plurality of intersecting drill holes (12). Assembly with a swivel drive (1) and a quick coupler (2). claim 3 or 4 , characterized in that exactly two channels are arranged mirror-symmetrically to one another. Working machine with a vehicle and a boom on which an assembly with a swivel drive (1) and a quick coupler (2) is attached, characterized in that the assembly is designed according to one of the preceding claims. working machine claim 7 , characterized in that the working machine is an excavator.

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