Pivoting device

Abstract

Swivel device for a working tool of a machine, in particular an excavator or crane, the swivel device comprising: a first swivel section for attaching a working tool to the swivel device, a second swivel section pivotable relative to the first swivel section about a pivot axis for attaching the swivel device to a boom arm of the machine, and a drive which is spatially arranged between the first swivel section and the second swivel section and which is designed to pivot the first swivel section relative to the second swivel section about the pivot axis.

Description

[0001] The invention relates to a pivoting device for a work tool of a work machine, in particular an excavator or crane. The pivoting device comprises a first pivoting section for attaching a work tool to the pivoting device and a second pivoting section pivotable about a pivot axis relative to the first pivoting section for attaching the pivoting device to a boom arm of the work machine.

[0002] Such a pivoting device is generally known and is typically used to pivot the work tool attached to the extension arm by means of the pivoting device. The pivoting device is generally mounted on the extension arm in such a way that the pivot axis of the pivoting device is aligned approximately parallel to the longitudinal extension of the extension arm. However, a different orientation of the pivot axis relative to the extension arm is also possible.

[0003] The swivel device can be used alone or in conjunction with a rotating device to rotate the work tool, particularly by 360°. The rotation axis of the rotating device is preferably aligned perpendicular to the pivot axis of the swivel device. The combination of the swivel device and the rotating device increases the number of degrees of freedom in which the work tool can be moved, thus enabling work in hard-to-reach places and / or around obstacles.

[0004] For such demanding applications, it is desirable for the swivel device to have a particularly compact design and at the same time allow swiveling within the largest possible swivel range.

[0005] It is therefore an object of the invention to provide a compact swivel device that can be swiveled over the widest possible range.

[0006] The object is achieved by a pivoting device having the features of claim 1 and in particular by a drive which is spatially arranged between the first pivoting section and the second pivoting section and which is designed to pivot the first pivoting section relative to the second pivoting section about the pivot axis.

[0007] The invention is based on the idea of ​​integrating a drive of a swivel device in the manner of a hub drive into the swivel device. As a result, the swivel device, like the hub drive, has a particularly compact design. At the same time, the swivel device has a comparatively large swivel range, which is ultimately only limited by the structural conditions of the swivel device. In particular, the swivel device according to the invention enables swiveling from a non-swivelled neutral position by 90° in opposite directions, resulting in a total swivel range of 180°. In principle, however, a larger swivel range of more than 180° is also possible, depending on the structural properties of the swivel device.

[0008] Advantageous further developments can be found in the description, the claims and the attached drawings.

[0009] According to an advantageous embodiment, the first pivoting section and the second pivoting section of the pivoting device each comprise a base plate. The drive is thus arranged between the base plates of the two pivoting sections, which can be pivoted relative to one another. The base plates enable a good connection of the pivoting device to the extension arm of the work device and to the work tool.

[0010] The base plates can be flat and each define a plane, with the angle of intersection between the planes changing by pivoting the pivoting sections of the pivoting device. In the non-pivoted neutral position, the planes are aligned parallel to each other.

[0011] To connect the swivel device to the boom arm of the work machine or to the work tool, a quick-change unit can be arranged on the base plate of the first swivel section and / or on the base plate of the second swivel section. The quick-change units are arranged on the side of the respective base plate facing away from the drive. This facilitates optional use of the swivel device.

[0012] Advantageously, the quick-change unit of the first pivoting section, which serves for coupling to the work tool, is complementary to a quick-change unit provided on the work tool. In particular, the quick-change unit of the first pivoting section can be the same as a quick-change unit typically provided on the extension arm for coupling to the work tool. For example, the quick-change unit of the first pivoting section can have claws designed to receive a quick-change frame provided on the work tool.

[0013] Correspondingly, the quick-change unit of the second pivoting section, which serves for coupling to the extension arm, can be complementary to a quick-change unit formed on the extension arm. In particular, the quick-change unit of the second pivoting section can be modeled on the quick-change unit of the work tool. For example, the quick-change unit of the second pivoting section can comprise a quick-change frame designed to be received in claws provided for this purpose on the extension arm.

[0014] Instead of a quick-change unit, a rotating device with a rotary drive defining a rotation axis can also be provided on one of the base plates. The rotating device is located on the side of the base plate facing away from the drive.

[0015] Furthermore, it is also possible to provide a rotating device between the base plate of a swivel section and the quick-change unit assigned to this swivel section.

[0016] Preferably, the rotational axis of the rotary drive, which can also be referred to as a rotator, is aligned at least approximately perpendicular to the pivot axis of the pivoting device. This allows the working tool to be pivoted not only about the pivot axis, but also about the rotational axis of the rotary drive, which is aligned at least approximately perpendicular to it. This enables a more versatile use of the working tool.

[0017] According to an advantageous embodiment, the drive may comprise a motor.

[0018] Preferably, the motor comprises a rotor rotatable about a rotational axis, which provides the rotational movement required for pivoting the pivoting device. Preferably, the motor is bidirectionally operable, allowing pivoting in two opposite directions.

[0019] A particularly compact design of the swivel device is achieved when the rotor's rotational axis is aligned parallel to the swivel axis of the swivel device, especially when the rotational axis and the swivel axis are aligned coaxially with each other. However, a compact design of the swivel device is also possible when the rotor's rotational axis is parallel to the swivel axis of the swivel device.

[0020] The motor and / or rotary drive of the rotating device can be hydraulically driven. This allows a hydraulic system already present for operating the boom and / or the work tool to be used to drive the motor or rotary drive.

[0021] The motor or rotary drive can, for example, be designed as a so-called "internally" actuated hydraulic radial piston motor, in which a stator is arranged essentially radially inside the rotor. Such a motor is generally known and comprises several drive pistons displaceable by hydraulic fluid, each guided in radial bores provided for this purpose in the stator. The radial bores are arranged in a star shape with respect to the rotational axis, so that the rotor is rotated by alternating, sequential displacement of the drive pistons.

[0022] Instead of the radial piston motor with internal thrust, another motor can also be used. For example, a hydraulic radial piston motor with external thrust can be used. In this case, the drive pistons are guided in a stator arranged radially outward relative to the rotor.

[0023] Alternatively, the motor or rotary drive can also be designed as a hydraulic axial piston motor. In an axial piston motor, the drive pistons are not displaced radially, but rather parallel to the axis of rotation.

[0024] As part of the increasing electrification of work machines, the motor or rotary drive can also be driven electrically, for example in the form of an electric motor.

[0025] To provide the torque required for pivoting, the drive may comprise a gear that can be driven by the motor.

[0026] According to an advantageous embodiment, the pivoting device has a particularly compact design if the motor and the gearbox are arranged in series, as seen in the direction of the pivot axis. In particular, the motor can be attached to the gearbox, for example, to a gearbox housing.

[0027] Advantageously, the motor can be mounted exclusively on the gearbox. The motor is thus supported solely by the gearbox and not by any other component of the swivel device. This design enables an even simpler and more compact design of the swivel device.

[0028] According to an advantageous embodiment, the pivoting device can have a fastening device for fastening the pivoting device to the extension arm of the work machine, wherein the fastening device is designed such that the motor and / or the connections for driving the motor face the work machine when the pivoting device is fastened to the work machine. This allows the motor and / or its connections to be protected against contamination and / or damage. Furthermore, such an arrangement of the motor or its connections offers the advantage that the supply lines required to supply the motor can be shorter than in an arrangement in which the motor or its connections are arranged on the side facing away from the work machine.

[0029] The fastening device can, for example, be the quick-change unit mentioned above. However, the fastening device can also be formed by means by which the swivel device can be attached directly to the boom arm of the work machine, for example, by a screw connection.

[0030] To convert a rotary movement of the drive into a pivoting movement of the pivoting device, the transmission can comprise a first transmission part and a second transmission part rotatable relative to the first transmission part about a transmission axis, wherein the first transmission part is attached to the first pivoting section of the pivoting device and the second transmission part is attached to the second pivoting section of the pivoting device. The transmission axis, like the rotational axis of the rotor, can be aligned parallel, in particular coaxially or at a parallel distance, to the pivoting axis of the pivoting device.

[0031] Preferably, the first gear part is fastened to a first fastening section protruding from the base plate of the first pivoting section and / or the second gear part is fastened to a second fastening section protruding from the base plate of the second pivoting section.

[0032] In principle, additional sections can also protrude from the base plates, for example to provide additional support for the drive and / or to accommodate a pivot bearing.

[0033] For fastening the first gear part to the fastening section, the first fastening section can have a fastening surface which is aligned at least approximately at right angles to the base plate of the first pivoting section and to which the first gear part is fastened.

[0034] In a corresponding manner, the second fastening section can have a fastening surface which is aligned at least approximately at right angles to the base plate of the second pivoting section and to which the second gear part is fastened.

[0035] To protect against unwanted contamination and / or damage but also for fastening to the corresponding base plate, at least one of the gear parts of the gearbox and / or the motor, in particular the motor fastened to one of the gear parts, can be accommodated at least in sections in a fastening sleeve.

[0036] In particular, the first gear part can be attached to the base plate of the first pivoting section by means of a first fastening sleeve that accommodates the first gear part at least in sections. According to an advantageous embodiment, the first fastening section is thus formed by the first fastening sleeve.

[0037] In a corresponding manner, the second gear part can be attached to the base plate of the second pivoting section by means of a second fastening sleeve that accommodates the second gear part at least in part. Thus, the second fastening section is preferably formed by the second fastening sleeve.

[0038] For fastening the fastening sleeve to the base plate, the first fastening sleeve can have a first flat contact surface via which the first fastening sleeve is fastened to the base plate of the first pivoting section.

[0039] In a comparable manner, the second fastening sleeve may have a second flat contact surface via which the second fastening sleeve is fastened to the base plate of the second pivoting section.

[0040] To fasten the first gear part to the first fastening sleeve, the first fastening sleeve can comprise a fastening surface, as described above, oriented at least approximately perpendicular to the base plate of the first pivoting section, to which the first gear part is fastened. Likewise, the second fastening sleeve can comprise a fastening surface, as described above, oriented at least approximately perpendicular to the base plate of the second pivoting section, to which the second gear part is fastened.

[0041] According to an advantageous embodiment, the first fastening sleeve has a beveled end face on its side facing away from its fastening surface, which is inclined from the first contact surface toward the fastening surface of the first fastening sleeve. The first contact surface thus forms a long side of the first fastening sleeve.

[0042] Similarly, the second fastening sleeve can have a beveled end face on its side facing away from its fastening surface, which is inclined from the second contact surface toward the fastening surface of the second fastening sleeve. Accordingly, the second contact surface forms a long side of the second fastening sleeve.

[0043] The beveled end faces of the mounting sleeves allow for material and weight savings compared to a non-beveled mounting sleeve. At the same time, the contact surfaces forming the long sides of the mounting sleeve enable secure attachment of the respective mounting sleeve to the corresponding base plate.

[0044] According to an advantageous embodiment, a compact design of the pivoting device is achieved if the pivot axis of the pivoting device and the longitudinal center axis of the first fastening sleeve are aligned at least approximately parallel, in particular coaxially, to one another. Similarly, the pivot axis of the pivoting device and the longitudinal center axis of the second fastening sleeve can be aligned at least approximately parallel, in particular coaxially, to one another.

[0045] According to an advantageous embodiment, the first fastening sleeve and the second fastening sleeve can have at least approximately identical basic shapes. This makes it possible to use identical base bodies for the respective fastening sleeves, which may then need to be adapted to the respective conditions of the first transmission part or the second transmission part and / or the engine.

[0046] According to an advantageous embodiment, the drive includes a brake. The brake can be assigned either to the transmission or to the motor. Alternatively, the brake can be assigned to both the transmission and the motor. Furthermore, it is also possible for the motor and the transmission to each be assigned their own brake.

[0047] The brake is preferably designed to be active when the motor is not driven. This eliminates the need for the motor to be active to maintain a desired swivel position. Rather, the swivel mechanism remains in the desired swivel position even when the motor is inactive. Therefore, the brake is preferably only active when the motor is not driven, thus serving as a parking brake.

[0048] To ensure the swivel mechanism is sufficiently locked in a desired swivel position, the brake can be a multi-disk brake. Multi-disk brakes are generally known for their high braking torque and are therefore particularly suitable for locking the swivel mechanism in a desired swivel position. In principle, however, other types of brakes can also be used for the same purpose, such as drum brakes, disc brakes, or similar.

[0049] The invention is described below purely by way of example using possible embodiments with reference to the accompanying drawings. They show: Fig. 1 is a perspective view of a pivoting device according to a first embodiment in a non-pivoted neutral position; Fig. 2 is a longitudinal sectional view of the pivoting device of Fig. 1 ; Fig. 3 a perspective view of a pivoting device according to a second embodiment in a non-pivoted neutral position; and Fig. 4 a side view of the pivoting device according to Fig. 3 .

[0050] The drawings show Fig. 1 and 2 a first embodiment of a pivoting device and Fig. 3 and 4 A second embodiment of a pivoting device. The following describes the similarities between the two embodiments, with the differences between the two embodiments being discussed at some point.

[0051] The pivoting devices shown in the drawings each comprise a first pivoting section 10 for fastening a work tool to the pivoting device and a second pivoting section 12 pivotable relative to the first pivoting section 10 about a pivot axis S for fastening the pivoting device to a boom of a work machine, such as an excavator or a crane.

[0052] The two pivoting sections 10, 12 each comprise a base plate 16, 18. The base plates 16, 18 are flat, with the base plate 16 of the first pivoting section 10 defining a first plane E 1 and the base plate 18 of the second pivoting section 12 defining a second plane E 2 ( Fig. 2 and 4 ). For a better view, the base plates 16, 18 are Fig. 3 not shown.

[0053] In the non-pivoted neutral position shown in the drawings, the two planes E 1 , E 2 are aligned parallel to each other. However, when the pivoting sections 10, 12 are pivoted, the angle of intersection between the planes E 1 , E 2 changes.

[0054] To pivot the two pivot sections 10, 12 relative to each other, the pivoting device comprises a drive 14, which is arranged spatially between the two pivotable pivot sections 10, 12 in the manner of a hub drive. More precisely, the drive 14 is arranged between the base plate 16 of the first pivot section 10 and the base plate 18 of the second pivot section 12, with the base plates 16, 18 surrounding the drive 14 in the radial direction with respect to the pivot axis S.

[0055] In order to couple the swivel device to the work tool or to the extension arm of the work machine, a quick-change unit (not shown in the drawings) can be provided on the side of the base plate 16 of the first swivel section 10 facing away from the drive 14 or on the side of the base plate 18 of the second swivel section 12 facing away from the drive 14.

[0056] The quick-change unit formed on the first pivot section 10 serves to attach the work tool to the pivoting device. For this purpose, the quick-change unit of the first pivot section 10 can be designed to complement a quick-change unit formed on the work tool. For example, the quick-change unit of the first pivot section 10 can have claws that serve to receive a quick-change frame provided on the work tool.

[0057] In a corresponding manner, the quick-change unit formed on the second pivoting section 12 can be designed to complement a quick-change unit provided on the extension arm. For example, the quick-change unit of the second pivoting section 12 can be designed similarly to the quick-change frame of the work tool and can be received in claws provided for attachment to the extension arm. The second quick-change unit thus forms a fastening device for attaching the pivoting device to the extension arm of the work machine.

[0058] A rotating device can be provided between at least one of the base plates 16, 18 and the respective quick-change unit to enable a 360° rotation of the working tool and / or the pivoting direction about a rotation axis oriented perpendicular to the pivot axis S. Such a configuration with a rotating device is not shown in the drawings.

[0059] To supply the rotating device and / or other hydraulically driven attachments, at least one of the base plates 16, 18 can be provided with at least one bore (not shown in the drawings) via which a hydraulic connection to the rotating device and / or the hydraulic attachment can be established.

[0060] The drive 14 comprises a motor 20, which in the illustrated embodiments is designed as a hydraulically driven motor. However, the motor can also be designed as an electrically driven motor.

[0061] To supply the motor 20 with hydraulic fluid, a hydraulic connection block 21 with hydraulic connections 23 is provided on the motor 20. Furthermore, a check valve 29 is provided on the hydraulic connection block 21 ( Fig. 3 and 4 ).

[0062] To protect the motor 20 and / or its connections 23, the second quick-change unit is preferably designed such that the motor 20 and / or its connections 23 face the working machine when the swivel device is attached to the working machine.

[0063] The motor 20 comprises a rotor 22 which is rotatable about an axis of rotation D and which Fig. 2 is only shown schematically and which provides a rotary movement for a gear 24 of the drive 14.

[0064] The motor 20 and the gear 24 are arranged in series in the direction of the pivot axis S for a compact construction of the pivoting device, wherein the motor 20 is connected to the gear 24 to drive the gear 24.

[0065] Furthermore, the drive 14 comprises a brake, not further shown in the drawings, which can be designed in the form of a multi-disk brake and which is conveniently integrated into the gear 24 for a compact design of the swivel device.

[0066] The brake is designed in such a way that it is only active when the motor 20 is not driven, i.e., when the motor 20 is inactive. The brake thus serves as a parking brake. This allows the desired pivoting position of the pivoting device to be maintained even when the motor 20 is inactive.

[0067] The drive 14 is fastened via the gear 24 to the mutually pivotable pivot sections 10, 12 of the pivoting device, namely by a first part 26 of the gear 24 being fastened to the first pivot section 10 of the pivoting device, and a second part 28 of the gear 24, which is rotatable relative to the first gear part 26, being fastened to the second pivot section 12 of the pivoting device. More precisely, the first gear part 26 is fastened to a fastening section 30 protruding from the base plate 16 of the first pivot section 10, and the second gear part 28 is fastened to a fastening section 32 protruding from the base plate 18 of the second pivot section 12 via a screw connection using a plurality of screws 36 ( Fig. 2 and 3 ).

[0068] Specifically, the first gear part 26 is fastened to the fastening section 30 on a fastening surface 46 that is aligned at least approximately at right angles to the base plate 16 of the first pivoting section 10.

[0069] For fastening the first gear part 26 to the first fastening section 30, the first gear part 26 in the present embodiments has a flange 49 which lies flat against the first fastening surface 46 and which is connected to the fastening section 30 via the aforementioned screw connection.

[0070] Similarly, the second gear part 28 is attached to the second attachment section 32 on a mounting surface 48 oriented at least approximately perpendicular to the base plate 18 of the second pivot section 12. For this purpose, the second gear part 28 also has a flange 51 that rests flat against the second attachment surface 48 and is connected to the attachment section 32 via the aforementioned screw connection.

[0071] As shown by Fig. 2 and 4 As can be seen, the fastening surfaces 46, 48 face each other.

[0072] For fastening the motor 20 to the gear 24, the fastening section 32 of the second pivoting section 12 of the pivoting device has a passage 44 (see e.g. Fig. 2 ). This makes it possible to connect the motor 20 to the gearbox 24.

[0073] In the following, based on the Fig. 1 and 2In the first embodiment of the pivoting device shown, a possibility of fastening the gear parts 26, 28 of the gear 24 to the respective base plates 16, 18 is described.

[0074] In the first embodiment of the pivoting device, the fastening sections 30, 32 are plate-shaped. The fastening sections 30, 32 each have a flat side on their radial outer circumference with respect to the pivot axis S. The fastening sections 30, 32 are each fastened to the corresponding base plate 16, 18 via the flat side. On an outer side facing away from the flat side, the fastening sections 30, 32 are rounded, so that the fastening sections 30, 32 have an overall D-shaped or U-shaped outer contour when viewed in the direction of the pivot axis S.

[0075] For additional support of the gear 24, the second part 28 of the gear 24 in the pivoting device of the first embodiment is fastened at one axial end of the pivoting device to a support section 34 projecting from the base plate 18 of the second pivoting section 12. The second gear part 28 is thus held between the fastening section 32 and the support section 34 of the second pivoting section 12 ( Fig. 2 ). As shown by Fig. 2 As can be seen, the first fastening section 30 has a passage 33 for the second gear part 28 for this purpose.

[0076] Between the fastening section 30 and the support section 34, the gear 24 is radially surrounded by a cylindrical protective cover 25 to protect it against damage and contamination, which is particularly evident in Fig. 2 is visible. In principle, additionally or alternatively, a further protective cover can be provided between the fastening section 30 of the first pivot section 10 and the fastening section 32 of the second pivot section 12.

[0077] The fastening sections 30, 32 are arranged approximately centrally between the axial ends of the pivoting device, as viewed in the direction of the pivot axis S. Furthermore, the first fastening section 30 is arranged between the second fastening section 32 and the support section 34, as viewed in the direction of the pivot axis S.

[0078] For additional stabilization, a pivot bearing 38 is provided at an axial end of the pivoting device of the first embodiment facing away from the support section 34, which is arranged between a first bearing section 40 projecting at right angles from the base plate 16 of the first pivoting section 10 and a second bearing section 42 projecting at right angles from the base plate of the second pivoting section 12.

[0079] At this point, it should be noted that the pivoting device may comprise further pivot bearings in addition to the pivot bearing 38 described here, particularly in the case of larger-sized pivoting devices.

[0080] As can be seen from the drawings ( Fig. 1 and 2 ), the pivot axis S runs centrally through the pivot bearing 38, so that the pivot axis S of the pivot device and the rotation axis of the pivot bearing 38 are coaxially aligned with each other.

[0081] Now referring to Fig. 3 and 4 In the following, a further possibility of fastening the gear parts 26, 28 of the gear 24 to the respective base plates 16, 18 is described using a second embodiment of the pivoting device.

[0082] In the pivoting device according to the second embodiment, the first fastening section 30 and the second fastening section 32 are not plate-shaped as in the first embodiment, but are each formed by a fastening sleeve 50, 52.

[0083] Each of the fastening sleeves 50, 52 has a passage extending in the axial direction with respect to its longitudinal center axis L, in which one of the gear parts 26, 28 is accommodated in sections and which is surrounded by a wall 54, 56 in the radial direction. Due to the perspective view, Fig. 3 only the passage extending through the first fastening sleeve 50 can be seen.

[0084] The gear parts 26, 28 are received in the respective passages of the mounting sleeves 50, 52 such that the longitudinal center axis L of the mounting sleeves and the gear axis G of the gear 24, as well as the pivot axis S of the pivoting device, are coaxially aligned with each other in the assembled state of the pivoting device. Understandably, in this embodiment, the rotational axis D of the motor 20 is also coaxially aligned with the pivot axis S of the pivoting device.

[0085] To fasten the gear parts 26, 28 to the respective fastening sleeves 50, 52, the fastening sleeves 50, 52, as well as the plate-like fastening sections 30, 32 of the first embodiment, each have a fastening surface 46, 48 aligned at least approximately at right angles to the corresponding base plates 16, 18. The gear parts 26, 28 are each fastened to the fastening surfaces 46, 48 via their flanges 49, 51 by means of screws 36, as described above.

[0086] The screws 36 are each received in the fastening sleeves 50, 52 in bores which penetrate the respective wall 54, 56 of the fastening sleeves 50, 52 in the axial direction with respect to the longitudinal center axis L of the fastening sleeves 50, 52 and which surround the passage formed in the fastening sleeves 54, 56 in the radial direction.

[0087] For fastening the fastening sleeves 50, 52 to the base plates 16, 18 of the pivot sections 10, 12, the fastening sleeves 50, 52 each have a flat contact surface 58, 60.

[0088] Specifically, the first fastening sleeve 50 is fastened to the base plate 16 of the first pivoting section 10 via a first planar contact surface 58 and the second fastening sleeve 52 is fastened to the base plate 18 of the second pivoting section 12 via a second planar contact surface 60 ( Fig. 3 combined with Fig. 4 ).

[0089] On the sides facing away from the contact surfaces 58, 60, the fastening sleeves 50, 52 are rounded, so that the fastening sleeves 50, 52 have a D-like or U-like cross-sectional shape similar to the plate-like fastening sections 30, 32 of the first embodiment.

[0090] As shown by Fig. 3 and 4As can be seen, each of the fastening sleeves 50, 52 has, on its side facing away from its fastening surface 46, 48, a beveled end face 62, 64, which is inclined from the contact surface 58, 60 of the respective fastening sleeve 50, 52 toward its respective fastening surface 46, 48. The contact surfaces 58, 60 thus each form a long side of the fastening sleeves 50, 52.

[0091] The beveled end faces 62, 64 of the mounting sleeves 50, 52 allow for material and weight savings compared to a non-beveled mounting sleeve. At the same time, the contact surfaces 58, 60 provide a sufficiently large area to securely attach the mounting sleeves 50, 52 to the respective base plates 16, 18 of the pivot sections 10, 12.

[0092] Furthermore, the gear components 26, 28 of the gearbox 24 and the motor 20 connected to the gearbox 24 are only partially accommodated in the mounting sleeves 50, 52 by the beveled end faces 62, 64. This facilitates access to the gear components 26, 28 and the motor 20 for maintenance purposes. At the same time, the remaining components of the drive 24 are protected from contamination and / or damage by the mounting sleeves 50, 52.

[0093] How Fig. 4 As can be seen, each of the fastening sleeves 50, 52 has a trapezoidal, in particular essentially rectangular trapezoidal, contour due to its oblique end faces 62, 64 in a projection onto a longitudinal sectional plane extending through the longitudinal center axis L and the corresponding contact surface 58, 60. With a correspondingly short design of the side facing away from the respective contact surface 58, 60, the fastening sleeves can also have an essentially triangular contour.

[0094] As further shown by Fig. 3 and 4As can be seen, the first fastening sleeve 50 and the second fastening sleeve 52 also have at least approximately identical basic shapes. The fastening sleeves 50, 52 can thus be prefabricated with identical dimensions and then only need to be adapted, if necessary, to the specific conditions of the drive 24, such as appropriate recesses for the motor connections 23.

[0095] It should be noted that one of the gear parts 26, 28 may be attached to the base plate 16, 18 in a manner as described in connection with the first embodiment, and the corresponding other gear part 28, 26 may be attached to the other base plate 18, 16 in a manner as described in connection with the second embodiment.

[0096] As already mentioned, in both embodiments the rotational axis D of the rotor 22 and the gear axis G of the gear 24 are aligned coaxially with the pivot axis S of the pivoting device, whereby the pivoting device has a particularly compact design.

[0097] In both embodiments, the first pivoting section 10 can be pivoted relative to the second pivoting section 12 of the pivoting device by at least 90° in opposite directions relative to the neutral position, as can be seen, for example, from Fig. 1 This results in a swivel range of at least 180° for the swivel device.

[0098] In particular, the two pivoting sections 10, 12 can be pivoted up to an angle of 90° relative to the neutral position, namely until one of the sections 30 or 40 protruding from the first base plate 16 comes into contact with the second base plate 18 or until one of the sections 32 or 34, 42 protruding from the second base plate 18 comes into contact with the first base plate 16. This enables a pivoting range of up to 180°. Bezugszeichenliste

[0099] 10First swivel section 12Second swivel section 14Drive 16Base plate 18Base plate 20Motor 21Hydraulic connection block 22Rotor 23Hydraulic connection 24Gearbox 25Protective cover 26First gearbox section 28Second gearbox section 29Locking valve 30Mounting section 32Mounting section 33Passage 34Support section 36Screw 38Pivot bearing 40Bearing section 42Bearing section 44Passage 46Mounting surface 48Mounting surface 49Flange 50Mounting sleeve 51Flange 52Mounting sleeve 54Wall 56Wall 58Contact surface 60Contact surface 62End face 64End face SSwivel axis Drotation axis GGear axis LLongitudinal center axis E 1 Level E 2 Level

Claims

1. Pivoting device for a work tool of a work machine, in particular an excavator or crane, the pivoting device comprising: - a first pivoting section (10) for fastening a work tool to the pivoting device, - a second pivoting section (12) which can be pivoted about a pivot axis (S) relative to the first pivoting section (10) for fastening the pivoting device to a cantilever arm of the work machine, and - a drive (14) which is spatially arranged between the first pivoting section (10) and the second pivoting section (12) and which is designed to pivot the first pivoting section (10) about the pivot axis (S) relative to the second pivoting section (12).

2. Swivel device according to claim 1, characterized in thatthe first pivoting section (10) and the second pivoting section (12) each comprise a base plate (16, 18), in particular wherein a quick-change unit is arranged on the base plate (16) of the first pivoting section (10) and / or on the base plate (18) of the second pivoting section (12).

3. Swivel device according to one of the preceding claims, characterized in that the drive (14) comprises a motor (20), in particular a hydraulically or electrically driven motor (20), and a transmission (24) which can be driven by means of the motor (20).

4. Swivel device according to claim 3, characterized in that the motor (20) comprises a rotor (22) rotatable about a rotational axis (D), in particular wherein the rotational axis (D) is aligned parallel, preferably coaxially or spaced parallel, to the pivot axis (S).

5. Transmission according to claim 4, characterized in thatthe motor (20) and the gear (24) are arranged in series as seen in the direction of the pivot axis (S), in particular wherein the motor (20) is fastened to the gear (24).

6. Swivel device according to one of claims 3 to 5, characterized in that the pivoting device has a fastening device for fastening the pivoting device to the extension arm of the work machine, wherein the fastening device is designed such that the motor (20) and / or the connections (23) for driving the motor (20) face the work machine when the pivoting device is fastened to the work machine.

7. Swivel device according to one of claims 4 to 6, characterized in thatthe gear (24) comprises a first gear part (26) and a second gear part (28) which is rotatable about a gear axis (G) with respect to the first gear part (26), wherein the first gear part (26) is fastened to the first pivoting section (10) of the pivoting device and the second gear part (28) is fastened to the second pivoting section (12) of the pivoting device, in particular wherein the gear axis (G) is aligned parallel, preferably coaxially or at a parallel distance, to the pivoting axis (S).

8. Swivel device according to claim 7, characterized in that the first gear part (26) is fastened to a first fastening section (30) protruding from the base plate (16) of the first pivoting section (10); and / or that the second gear part (28) is fastened to a second fastening section (32) protruding from the base plate (18) of the second pivoting section (12).

9. Swivel device according to claim 8, characterized in thatthe first fastening section (30) has a fastening surface (46) oriented at least approximately at right angles to the base plate (16) of the first pivoting section (10), to which the first gear part (26) is fastened; and / or that the second fastening section (32) has a fastening surface (48) oriented at least approximately at right angles to the base plate (18) of the second pivoting section (12), to which the second gear part (28) is fastened.

10. Swivel device according to one of claims 7 to 9, characterized in thatthe first gear part (26) is fastened to the base plate (16) of the first pivoting section (10) by means of a first fastening sleeve (50) which at least partially accommodates the first gear part (26); and / or that the second gear part (28) is fastened to the base plate (18) of the second pivoting section (12) by means of a second fastening sleeve (82) which at least partially accommodates the second gear part (28).

11. Swivel device according to claim 10 in conjunction with claim 8, characterized in that the first fastening section (30) is formed by the first fastening sleeve (50); and / or that the second fastening section (32) is formed by the second fastening sleeve (52).

12. Swivel device according to claim 10 or 11, characterized in thatthe first fastening sleeve (50) has a first planar contact surface (58) via which the first fastening sleeve (50) is fastened to the base plate (16) of the first pivoting section (10); and / or that the second fastening sleeve (52) has a second planar contact surface (60) via which the second fastening sleeve (52) is fastened to the base plate (18) of the second pivoting section (12).

13. Swivel device according to claim 11 or 12 in conjunction with claim 10, characterized in that the first fastening sleeve (50) has, on its side facing away from its fastening surface (46), a bevelled end face (62) which is inclined from the first contact surface (58) in the direction of the fastening surface (46); and / or that the second fastening sleeve (52) has, on its side facing away from its fastening surface (48), a bevelled end face (64) which is inclined from the second contact surface (60) in the direction of the fastening surface (48).

14. Swivel device according to one of claims 10 to 13, characterized in that the pivot axis (S) and the longitudinal center axis (L) of the first fastening sleeve (50) are aligned at least approximately parallel, in particular coaxial, to one another; and / or the pivot axis (S) and the longitudinal center axis (L) of the second fastening sleeve (52) are aligned at least approximately parallel, in particular coaxial, to one another.

15. Swivel device according to one of the preceding claims, characterized in that the drive (14) comprises a brake, preferably a multi-disk brake, in particular wherein the brake is assigned to the transmission (24) and / or the motor (20), in particular wherein the brake is brakingly active when the motor (20) is not driven, preferably is brakingly active only when the motor (20) is not driven.

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