Front loader, work vehicle, and work vehicle system

Abstract

The invention relates to a front loader (1) for a work vehicle. The front loader has a boom (3) with arms (10, 11). One arm (10) can be extended into different telescopic positions by means of an actuator (26). According to the invention, in addition to the telescopic degree of freedom (23), a pivot bearing (12) is provided between the two arms (10, 11). By means of an actuator (14), the two arms (10, 11) can be pivoted into different relative pivot positions, thereby changing the length of the boom (3). It is possible that the actuator (26) is integrated into the arm (10).

Description

TECHNICAL FIELD OF THE INVENTION

[0001] Work vehicles, especially tractors equipped with a front loader, are used in agriculture or municipal applications for lifting, lowering, and transporting loads. A tractor with an attached front loader can also function as a wheel loader.

[0002] Known front loaders have a rocker arm with a column that can be mounted on an attachment bracket, in particular on an attachment tower, of a work vehicle. In the end area of ​​the rocker arm facing away from the column, the front loader has a tool holder, via which the front loader can be releasably coupled to a tool, for example a manure fork, a shovel, a pallet fork, a fork with heavy-duty tines, a round bale fork, or a beet basket. It is also possible for a tool that performs a working stroke, in particular a cutting pliers, a box rotator, or a gripping tool (e.g., a film bale gripping tool, a solid manure gripping tool, or a log gripping tool), to be attached to the front loader.

[0003] Conventional booms consist of a front beam and a rear beam. The beams are formed from tubular steel sections that are welded together at an angle at their facing ends. Hydraulic cylinders, whose hydraulic pressure is provided and controlled by the work vehicle, can be used to control the pivoting of the front loader around a pivot bearing, which can be formed between the column and the boom, and the pivoting of the implement holder relative to the boom. The driver can control the hydraulic pressure applied to the hydraulic cylinders by operating levers.Alternatively, the hydraulic actuation of the hydraulic cylinders can be controlled via a joystick or a joystick lever. Moving the joystick or joystick lever forward and backward can raise and lower the front loader's boom, while moving the joystick or joystick lever to the right and left changes the pivot angle of the tool holder relative to the boom around a transverse axis. Additional push-button and / or toggle switches can control additional functions, in particular the actuation of a tool performing a working stroke.

[0004] The hydraulic cylinders are hydraulically actuated via connecting lines between the work vehicle and the front loader, with the hydraulic fluid being supplied by the tractor's own hydraulic pump. The hydraulic system can be controlled from the driver's seat by the driver using controls such as levers, switches, or a joystick, and by means of control devices provided on the work vehicle and / or by means of control devices located on the front loader, whereby electromagnetic control of control valves is also used. The connecting lines of the hydraulic system between the work vehicle and the front loader can be individually connected via connections, or a so-called "multi-coupling" can be used, via which several or all hydraulic connections are connected simultaneously.

[0005] The tool holder can be designed as a so-called Euro quick-change frame or as a tool holder according to one of the standards EN 12525 or ISO 24410.

[0006] Automatic coupling devices are also used, which allow the tool holder to be coupled to the tool and locked without the driver having to leave the cab.

[0007] Coordination devices designed as parallel guides can be used to coordinate the hydraulic pressures of the hydraulic cylinder for raising and lowering the swing arm and the hydraulic cylinder for pivoting the tool holder relative to the swing arm in such a way that the angle between the tool holder and the ground does not change or only changes within narrow limits during the lifting and lowering of the swing arm.

[0008] In this technical field, the invention relates to a front loader for a work vehicle, a work vehicle with an attachment console for coupling the work vehicle to a front loader and a work vehicle system which has a work vehicle and a front loader. STATE OF THE ART

[0009] The applicant's patent DE 10 2005 048 280 B4 discloses general prior art usable within the scope of the invention with regard to valves of the work vehicle that can be actuated by the driver for controlling the hydraulic loading of the hydraulic cylinders of the front loader, additional solenoid valves and hydraulic coupling devices for coupling connecting lines between the work vehicle and the front loader.

[0010] The applicant's published patent application DE 10 2005 053 041 A1 discloses general prior art applicable to the invention, relating to a front loader with a column, rigidly connected beams, and a tool holder, as well as two hydraulic cylinders, one for raising and lowering the boom and the other for pivoting the tool holder. The front loader has a parking support that can be extended via another hydraulic cylinder.When the parking support is extended, the front loader can be parked on the tool holder or a tool held on it, such as a shovel, and the parking support, with the center of gravity of the front loader with tool located on the ground between the parking locations, but the front loader can also extend beyond the space between the parking locations to ensure good accessibility of the column and to enable the column to be coupled to the attachment console of the work vehicle.

[0011] The applicant's patent DE 10 2009 046 213 B4 discloses general prior art usable within the scope of the invention for designing a tool holder according to ISO 24410 and a locking mechanism for locking the tool in the tool holder.

[0012] The applicant's patent EP 1 813 730 B1 discloses general prior art, which can be used within the scope of the invention, for designing a hydraulic system for controlling a front loader and for pressure control in the hydraulic system.

[0013] The applicant's patent EP 1 903 147 B1 discloses general prior art, applicable within the scope of the invention, for the geometric design of the beams of a swing arm of a front loader and the integration of the actuating kinematics of the front loader with the hydraulic cylinders in the front loader.

[0014] The applicant's patent EP 2 840 186 B1 discloses general prior art, which can be used within the scope of the invention, for the design of an attachment bracket, here in an embodiment with a so-called bone, and for the design of a latching or locking device for locking the column of the front loader to the attachment bracket.

[0015] The patent EP 3 158 842 B1 discloses design options that can be used within the scope of the invention for an attachment console of the work vehicle, which is formed here by two attachment towers on both sides of the work vehicle, which have plate-shaped frame elements extending in the longitudinal direction and vertically extending holders with a bone at the end.

[0016] The applicant's patent EP 3 431 668 B1 discloses general prior art, usable within the scope of the invention, for the design of a partial fairing of the front loader for covering moving components, in particular a control rod.

[0017] The applicant's patent application EP 4 144 925 A1 discloses further possibilities for designing an attachment bracket in the form of an attachment tower, which can be used within the scope of the invention, wherein the attachment tower is at least partially manufactured by means of solid forming.

[0018] The website https: / / youtu.be / JchP-UKsL84 (date of access: July 12, 2023) discloses a front loader in which the rear boom arm, facing the work vehicle, is telescopic. This front loader is also shown and described (with reference to a patent) on the website www.lfprototipi.com / portfolio-type / caricatore-frontale-telescopico-brevettato. OBJECT OF THE INVENTION

[0019] The present invention is based on the object to propose a front loader for a work vehicle, a work vehicle and a work vehicle system, which is improved in particular with regard to the degrees of freedom of the front loader and a tool held thereon and / or the working area of ​​the front loader and the tool held thereon and / or an improvement in the field of vision of the user in the cab of the work vehicle, in particular while driving. SOLUTION

[0020] The object of the invention is achieved according to the invention with the features of the independent patent claims. Further preferred embodiments of the invention can be found in the dependent patent claims. DESCRIPTION OF THE INVENTION

[0021] To achieve the object underlying the invention, the invention proposes a front loader intended for a work vehicle, in particular a tractor, and having a swing arm. The swing arm has a front beam and a rear beam. Furthermore, the front loader can have a tool holder hinged to the front beam, which can be pivoted via a hydraulic cylinder, and / or a column hinged to the rear beam, which can be pivoted via a hydraulic cylinder.

[0022] According to the invention, the rocker formed by the beams is not rigid, but has at least one degree of freedom. In the front loader according to the invention, one beam can be telescoped into different telescopic positions by means of a first actuator, thus altering the length of this beam. The telescopic beam can be the front beam. However, the rear beam is preferably telescopic. The invention also encompasses embodiments in which both beams are telescopic.

[0023] To ensure telescoping, the beam can have two beam sections, each designed to receive and rigidly support the load acting on the front loader and which can be moved relative to each other to achieve the different telescopic positions.

[0024] The invention proposes for a first variant that the swing arm has a further degree of freedom: For this variant, the two bars can be pivoted about a swing arm pivot bearing into different (relative) pivot positions. The pivoting of the bars about the swing arm pivot bearing is brought about by means of a second actuator. For this variant of the invention, the length of the front loader, which in particular refers to the distance between the opposite end regions of the bars or the distance of the column from the tool holder, depends on both the telescopic position and the pivot position. The two degrees of freedom enable modified control options for the movement of the tool holder and the tool attached to it. It is also possible to increase the range of change in the length of the front loader, for example byThe length is minimal with the telescopic position fully retracted and the longitudinal axes of both booms at their maximum pivot angle, while the length of the front loader is maximal with the telescopic position fully extended and the pivot position closest to the extended position of the longitudinal axes of the booms. It is also possible that the same location of the end section of the boom, where the tool holder is pivotably mounted, can be achieved for different relative pivot angles of the booms and different telescopic positions (and possibly also for different positions of the hydraulic cylinder for raising and lowering the boom), which can be used to expand the movement and control options.

[0025] In a second variant (which can be used alternatively or in addition to the first variant), the first actuator is integrated into the boom. This allows for a very compact design of the boom and thus the front loader, while also ensuring a certain degree of protection for the first actuator.

[0026] To give merely one non-limiting example, the spar parts of the telescopic spar, upon which the first actuator acts, can form a cross-section delimiting an interior space, in which the first actuator is then arranged. In this case, the cross-section of at least one spar part can be closed at the edge, whereby the actuator (at least in a longitudinal section) is arranged completely inside the at least one spar part. However, it is also possible for the spar parts to have an open-edged cross-section (for example, a slotted cross-section or a U-shaped cross-section), in which case the edge opening of one spar part can be closed by the other spar part.

[0027] In the context of the invention, "telescoping" of the beam parts is understood to mean both a movement of the beam parts apart to increase the length and a pushing of the beam parts into each other to reduce the length.

[0028] Any actuators can be used within the scope of the invention, and actuators of different types can also be used. For example, it is possible for the actuators to be designed as electric linear motors that act directly on the bar parts for telescoping or, similar to a hydraulic cylinder, can be articulated with their two end regions at a distance from the swing arm pivot bearing to the bars to be pivoted. It is also possible for the pivoting of the bars about the swing arm pivot bearing to be brought about by an electric rotary drive. For one proposal of the invention, however, the first actuator and / or the second actuator is / are designed as a hydraulic actuator, in particular with a hydraulic cylinder. Such hydraulic actuators can be easily integrated into a hydraulic system of a work vehicle and a front loader of basically known design.On the other hand, it has been shown that operating the front loader using hydraulic cylinders is robust and, depending on the hydraulic ratio, enables the provision of large forces for lifting, lowering, telescoping and / or pivoting.

[0029] It is possible that, within the scope of the invention, a separate actuation of the first actuator and / or the second actuator is carried out by the user, which can then serve to actuate the actuators simultaneously and / or to actuate the actuators one after the other or at different times.

[0030] For a particular proposal of the invention, the front loader (or the work vehicle) has a coordination device that coordinates the actuation of the first actuator and the second actuator. Some examples of the coordination performed by the coordination device are given below, but these are not intended to limit the scope of the invention and the possible coordination measures: It is possible that a tool held on the tool holder, such as a shovel or a bale fork, is to be moved parallel to the ground, for example to insert the open shovel into a pile of sand to fill the shovel with sand, or to push a bale fork into or under a bale. If the telescopic handle is not oriented horizontally in this case, the telescoping of the handle sections leads to an undesirable change in the height of the tool holder and the tool held therein. In this case, the coordination can act on the second actuator simultaneously with the actuation of the first actuator in such a way that this actuation precisely compensates for the undesirable change in the height of the tool holder and the tool.The same can apply in the opposite direction if the movement of the tool holder or the tool is basically brought about by actuating the second actuator, while a compensating movement is then brought about by the first actuator using the coordination device. The same can apply if a tool holder with a tool held on it is to be moved vertically, for example to lift a bale vertically. If the telescopic bar is not oriented vertically, the telescoping of the bar sections leads to a superimposed, undesirable horizontal movement, which can be compensated for by the coordination device through the simultaneous actuation of the second actuator. Here, too, the same applies in the opposite direction.

[0031] The spar parts can have a straight, curved, or angled longitudinal axis and a cross-section that is constant or variable as desired in the direction of the longitudinal axis, as long as the spar parts are telescopic. Preferably, the spar parts have at least one straight longitudinal section in which the outer cross-section of an inner spar part is guided in a cross-section of the outer spar part. In this guiding and telescopic longitudinal section, the spar parts preferably have non-circular guide cross-sections. The non-circular guide cross-sections can then form a positive connection in the circumferential direction around the longitudinal axis, which blocks relative rotation of the spar parts about the longitudinal axis. The non-circular guide cross-sections can then provide the longitudinal degree of freedom for telescoping the spar parts.

[0032] It is possible for the spar sections to slide directly against one another in this telescopic guide area. According to one proposal of the invention, the guidance can be ensured or improved and / or the friction between the spar sections during telescoping can be reduced by arranging plain bearing elements between the guide cross-sections of the spar sections. The spar sections are then guided via the plain bearing elements. The plain bearing elements can be designed in accordance with any of the plain bearing elements available from the prior art. For example, sliding plates can be used as plain bearing elements. Here, for example, several such flat sliding plates can be arranged distributed over a non-circular guide cross-section of the spar sections, which then ensure that the spar sections are supported on one another vertically to the longitudinal or telescopic axis in different directions.

[0033] A further solution to the problem underlying the invention is a work vehicle. The work vehicle is equipped with an attachment console which enables the work vehicle to be coupled to a front loader as described above. For this solution, the work vehicle has connecting lines. A first connecting line serves to actuate the first actuator in order to telescope the boom into different telescopic positions. The work vehicle also has a second connecting line. The second connecting line is used to actuate the actuator in order to pivot the booms about the swing arm pivot bearing into different pivot positions. The first and second connecting lines can be designed as electrical lines via which the control signals for the actuators are transmitted and / or the electrical power supply to the actuators is provided.Preferably, the first and second connecting lines are designed as hydraulic lines, through which the hydraulic pressure is applied to the actuators, which are then designed as hydraulic cylinders. The connecting lines have suitable connections that enable the connection of these connecting lines between the work vehicle and the front loader.

[0034] A further solution to the problem underlying the invention is a work vehicle system comprising a work vehicle of the type described above and a front loader described above. In this case, the front loader has a column that is detachably attached to the attachment bracket. The work vehicle and the front loader are then connected to each other via the first connecting line and the second connecting line. The first actuator and the second actuator are then actuated (in particular electrically, electropneumatically, electrohydraulicly, or hydraulically) via the connecting lines.

[0035] Advantageous further developments of the invention emerge from the patent claims, the description and the drawings.

[0036] The advantages of features and combinations of several features mentioned in the description are merely exemplary and can be effective alternatively or cumulatively, without the advantages necessarily having to be achieved by embodiments according to the invention.

[0037] With regard to the disclosure content – ​​not the scope of protection – of the original application documents and the patent, the following applies: Further features can be found in the drawings – in particular the illustrated geometries and the relative dimensions of several components to one another, as well as their relative arrangement and operative connection. The combination of features of different embodiments of the invention or features of different patent claims is also possible, deviating from the chosen references of the patent claims, and is hereby encouraged. This also applies to features that are illustrated in separate drawings or mentioned in their description.

[0038] These features can also be combined with features of different patent claims. Likewise, features listed in the patent claims can be omitted for further embodiments of the invention, but this does not apply to the independent patent claims of the granted patent.

[0039] The number of features mentioned in the patent claims and the description is to be understood as meaning that exactly this number or a greater number than the stated number is present, without the need for the explicit use of the adverb "at least." Thus, if, for example, reference is made to a connecting line or a sliding bearing element, this is to be understood as meaning that exactly one connecting line or exactly one sliding bearing element, two connecting lines or sliding bearing elements, or more connecting lines or sliding bearing elements are present. The features mentioned in the patent claims may be supplemented by further features or may be the only features present in the subject matter of the respective patent claim.

[0040] The reference signs contained in the patent claims do not represent a limitation of the scope of the subject-matter protected by the patent claims. They serve solely to make the patent claims easier to understand. BRIEF DESCRIPTION OF THE CHARACTERS

[0041] In the following, the invention is further explained and described with reference to preferred embodiments shown in the figures. Fig. 1 shows a front loader in a longitudinal section with an angled swivel position of the bars and a telescopic bar that is fully retracted. Fig. 2 shows a cross section II-II of the front loader according to Fig. 1 . Fig. 3 shows the front loader according to Fig. 1 and 2 in a longitudinal section with an angled pivoting position of the bars and with a telescopic bar extended to its maximum. Fig. 4 shows the front loader according to Fig. 1 to 3in a longitudinal section with the bars pivoted in an extended position and with the telescopic bar retracted to its maximum. Fig. 5 shows the front loader according to Fig. 1 to 4 in a side view. Fig. 6 shows the front loader according to Fig. 1 to 5 in a top view. FIGURE DESCRIPTION

[0042] In the figures, components, and features that correspond or are similar in terms of their design and / or function are sometimes identified by the same reference numbers, although these may then be differentiated from one another by an additional letter a, b, etc. In this case, reference may be made to the components, components, or features with or without the additional letter, which may then refer to one, several, or all of the components, components, or features identified by these reference numbers.

[0043] Fig. 1shows a front loader 1. The front loader has a column 2, a swing arm 3, and a tool holder not shown in the figures. The column 2 has fastening elements 4, 5, via which the column 2 can be releasably attached to an attachment bracket of a work vehicle. In the illustrated embodiment, the fastening elements 4, 5 are designed as fastening bolts oriented vertically to the plane of the drawing.

[0044] In a pivot bearing 6, the rocker arm 3 is pivotally connected to the column 2 about a pivot axis 7 oriented vertically to the plane of the drawing. The pivoting of the rocker arm 3 about the pivot axis 7 relative to the column 2 can be achieved by means of an actuator 8, which is designed here as a hydraulic cylinder 9. Although the rocker arm 3 is pivoted about the pivot axis 7, the pivoting of the rocker arm 3 about the pivot axis 7 by means of the hydraulic cylinder 9 is also referred to for simplicity as raising or lowering the front loader 1.

[0045] The swing arm 3 has struts 10, 11. The struts 10, 11 are pivotable about a swing arm pivot axis 13 via a swing arm pivot bearing 12 in their mutually facing end regions. The pivoting about the swing arm pivot axis 13 is achieved by an actuator 14, sometimes referred to here as a "second actuator," and is designed as a hydraulic cylinder 15. The actuator 14 is articulated to the struts 10, 11 in the end regions, spaced apart from the swing arm pivot bearing 12.

[0046] In the end area facing away from the swing arm pivot bearing 12, the beam 11 has a pivot bearing 16, from which Fig. 1only one bearing eye is shown. The tool holder (not shown) is pivotally connected to the beam 11 in the pivot bearing 16. An actuator 17, which is also designed as a hydraulic cylinder here, is also pivotally connected to the tool holder in a pivot bearing 19 at a distance from the pivot bearing 16. The other end region of the actuator 17 is pivotally connected to the beam 11 via a pivot bearing 35. Depending on the travel of the actuator 17, the tool holder and the tool held on the tool holder can be pivoted about the pivot axis of the beam 11 predetermined by the pivot bearing 16.

[0047] The bar 10 has bar parts 20, 21 that are connected to one another via a guide device 22 such that the bar parts 20, 21 have a telescopic degree of freedom 23, by means of which a change in the length of the bar 10 can be brought about. For the illustrated embodiment, the guide device 22 with the telescopic degree of freedom 23 is provided in that one bar part (here, the bar part 20, on which the swing arm pivot bearing 12 is formed) is received and guided in the other bar part (here, the bar part 21, on which the pivot bearing 6 is formed). For this purpose, the outer cross-section of the bar part 20 (with a play allowing movement) is designed to correspond to the inner cross-section of the bar part 21.

[0048] Fig. 2shows an example of the design of the cross-sections of the spar parts 20, 21. Here, it can be seen that the spar parts 20, 21 (at least in the area of ​​the guide device 22) have corresponding hexagonal cross-sections. The hexagonal cross-sections result in the cross-section between the six corners having six flat partial surfaces, which ensure good support between the spar parts 20, 21 in the direction of the surface normals of the partial surfaces.

[0049] Between the spar parts 20, 21, sliding bearing elements 24 are arranged, which for the illustrated embodiment are designed as sliding bearing plates 25, which are arranged on one of the partial surfaces of the hexagonal cross sections.

[0050] The beam parts 20, 21 are telescoping by means of an actuator 26, which is designed here as a hydraulic cylinder 26 and is integrated into the beam 10 and the beam parts 20, 21. The beam parts 20, 21 define an interior space 28 in which the hydraulic cylinder 27 is arranged and through which the hydraulic cylinder 27 extends.

[0051] The actuator 26, here a piston rod 30, is articulated to the beam part 20 by a pivot bearing 29, while the other end region of the actuator 26, here the cylinder housing 31, is articulated to the beam part 21 in a pivot bearing 32.

[0052] In Fig. 1 the length of the telescopic beam 10 is minimal, so that the actuator 26 or hydraulic cylinder 27 is fully retracted. Furthermore, Fig. 1the actuator 14 or hydraulic cylinder 15 is partially, largely or completely retracted, so that a pivot angle between the longitudinal axes of the beams 10, 11 about the pivot axis 13 results, which is in the range between 90° and 180°, here approximately 120° to 130°.

[0053] Fig. 3shows a modified operating position of the front loader 1, which is brought about by the extension of the actuator 26 or hydraulic cylinder 27, whereby the length of the boom 10 has increased. This telescopic extension of the boom 10, due to the horizontal orientation of the boom 10 here, results in a tool held on the tool holder being moved horizontally to the ground. The reach of the front loader 11 is increased by the telescoping of the boom 10. The length of the rocker arm 3, which characterizes the distance between the pivot bearings 6, 16, has been increased by the extension of the actuator 26 or hydraulic cylinder 27, whereby due to the angle of the booms 10, 11, the increase in the length of the rocker arm 3 is smaller than the increase in the length of the boom 10.

[0054] Fig. 4 shows a further operating position of the front loader 1, which differs from the operating position according to Fig. 1This is achieved by extending the actuator 14 or hydraulic cylinder 15 such that the bars 10, 11 assume their extended position, in which the longitudinal axes of the bars 10, 11 are arranged parallel or aligned with one another. This extension of the actuator 14 leads to an increase in the length of the rocker arm 3, which here is accompanied, on the one hand, by a lifting of the tool holder and the tool and, on the other hand, by a superimposed horizontal movement of the tool holder with the tool.

[0055] An operating position with a maximum length of the rocker arm 3 can be achieved if the beam 10 is telescoped to its maximum length by fully extending the actuator 26 or hydraulic cylinder 27 ( Fig. 3 ) and by maximum extension of the actuator 14 or hydraulic cylinder 15 the bars 10, 11 assume the extended position (cf. Fig. 4 ).

[0056] Fig. 5shows the front loader 1 in a non-sectioned side view. For the Fig. 5 The operating position shown is different from the operating positions according to Fig. 1 , 3 and 4 the actuator 8 or hydraulic cylinder 9 is partially retracted, which results in the beam 10 being tilted downwards. The beam 10 is the Fig. 5 The actuator 14 or the hydraulic cylinder 15 assumes an operating position in which the beams 10, 11 are angled.

[0057] In Fig. 6 It can be seen that the front loader 1 has two parallel, corresponding, or identical front loader parts 33a, 33b, which are connected to each other via cross struts 34a, 34b. The two front loader parts 33 each have a column 2a, 2b, via which the front loader parts 33a, 33b can each be connected to an associated attachment bracket of the work vehicle.

[0058] In the figures, the operating positions of the pistons and piston rods may not be shown correctly for the described operating positions of the front loader, whereby the expert will interpret the figures by expertly adapting the operating positions of the pistons and piston rods. LIST OF REFERENCE SYMBOLS

[0059] 1 Front loader 2 Column 3 Swing arm 4 Fastening element 5 Fastening element 6 Pivot bearing 7 Pivot axis 8 Actuator 9 Hydraulic cylinder 10 Beam 11 Beam 12 Swing arm pivot bearing 13 Swing arm pivot axis 14 Actuator 15 Hydraulic cylinder 16 Pivot bearing 17 Actuator 18 Hydraulic cylinder 19 Pivot bearing 20 Beam section 21 Beam section 22 Guide device 23 Telescopic degree of freedom 24 Plain bearing element 25 Plain bearing plate 26 Actuator 27 Hydraulic cylinder 28 Interior 29 Pivot bearing 30 Piston rod 31 Cylinder housing 32 Pivot bearing 33 Front loader section 34 Cross member 35 Pivot bearing

Claims

1. Front loader (1) for a work vehicle with a swing arm (3) having beams (10, 11), wherein a beam (10) can be telescoped into different telescopic positions by means of a first actuator (26), characterized in that a) the beams (10, 11) can be pivoted into different pivot positions about a swing arm pivot bearing (12) by means of a second actuator (14) and the length of the front loader (1) depends on both the telescopic position and the pivot position and / or b) the first actuator (26) is integrated into the beam (10).

2. Front loader (1) according to claim 1, characterized in that the first actuator (26) and / or the second actuator (14) are / is designed as a hydraulic actuator (27; 15).

3. Front loader (1) according to one of the preceding claims, characterized in that a coordination device is provided which coordinates the actuation of the first actuator (26) and the second actuator (14).

4. Front loader (1) according to one of the preceding claims, characterized in that the bar (10) which can be telescopically moved into different telescopic positions via the first actuator (26) has two telescopic bar parts (20, 21).

5. Front loader (1) according to claim 4, characterized in that the spar parts (20, 21) have non-circular guide cross-sections.

6. Front loader (1) according to claim 4 or 5, characterized in that the spar parts (20, 21) are guided telescopically via sliding bearing elements (24) arranged between guide cross-sections of the spar parts (20, 21).

7. Work vehicle with an attachment console for coupling the work vehicle to a front loader (1) according to one of claims 1 to 6, wherein the work vehicle a) has a first connecting line, via which the bar (10) can be telescoped into different telescopic positions by means of the first actuator (26), and b) has a second connecting line, via which the bars (10, 11) can be pivoted about the swing arm pivot bearing (12) into different pivot positions by means of the second actuator (14).

8. Work vehicle system with a work vehicle according to claim 7 and a front loader (1) according to one of claims 1 to 6, wherein a) the front loader (1) has a column (2) which is detachably fastened to the attachment console, and b) the work vehicle and the front loader (1) are connected to one another via the first connecting line and via the second connecting line, via which the first actuator (26) and the second actuator (14) are actuated.

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