Cleaning attachment, suction device

Description

[0001] The invention relates to a cleaning attachment for a suction device. The invention further relates to a suction device with a cleaning attachment.

[0002] From DE 10 2019 133 219 A1, an attachment and a method for cleaning an electrical socket are known, comprising a cleaning element and a drive element for powering the cleaning element, wherein the drive element can be powered by an airflow driven by a vacuum cleaner. From DE 84 05 468 U1, a cleaning attachment with an angled suction direction is known. From US 4,686,729 A, a washing brush with a water delivery direction that runs opposite to a suction direction is known. From DE 10 2015 107 877 A1, a carpet brush device with a bypass flow for driving a turbine is known. Further attachments or cleaning devices are known from US 2008 / 313847 A1, DE 944 149 C, DE 198 48 787 A1, and US 8 769 766 B2.

[0003] The invention is based on the objective of providing a cleaning attachment for a suction device with an improved cleaning effect, especially for delicate and sensitive parts.

[0004] The problem underlying the invention is solved by a cleaning attachment with the features of claim 1. The invention relates to a cleaning attachment for a suction device, comprising a connection section for arrangement on a suction line and / or in a suction line of the suction device and a rotating section rotatably arranged on the connection section for receiving a cleaning element, wherein the connection section has a connection housing and a drive device rotatably mounted in the connection housing about a suction direction for driving the rotating section, wherein the drive device and the rotating section are connected by means of a gear device for reducing the speed of the drive device.

[0005] Accordingly, in addition to the suction power of the suction device, cleaning can be provided by a rotating cleaning element. By rotating around the suction direction, the cleaning element can extend along the suction direction, thus enabling the cleaning attachment to reach difficult-to-access areas of delicate and / or sensitive parts. Due to the speed reduction provided by the gear unit, the rotating section can be operated at a suitable speed, allowing even sensitive parts to be cleaned.

[0006] For example, an impeller installed in the suction line of a vacuum cleaner would rotate at approximately 40,000 revolutions per minute without a load at a medium vacuum cleaner setting. The output speed can be adjusted within limits by changing the number of blades and their pitch angle. At such a high speed, a high-pitched, loud whistling sound is produced. Therefore, a reduction gear is particularly advantageous. Firstly, the gear unit, with its rotating mass and internal friction, acts as a load on the impeller; secondly, it is beneficial for generating usable speeds and torques at the cleaning element. A comfortable output speed for the cleaning element is preferably between 400 and 600 rpm. At higher speeds, the brush bristles spread out, which negatively impacts the cleaning effect.

[0007] For the purposes of this invention, a suction attachment can also be understood to mean a suction nozzle and / or a suction extension. The suction device is preferably designed as a household vacuum cleaner. For the purposes of the invention, the suction direction is understood to mean the main flow direction of the suction stream. In a vacuum cleaner, the suction direction extends from the suction attachment through the suction line into the vacuum cleaner collection container, in particular the vacuum cleaner bag.

[0008] It is advantageous if the transmission device is designed as a two-stage transmission device. In the first transmission stage, a reduction ratio of between 20:1 and 10:1, particularly 15:1, is preferably achieved, and / or in the second transmission stage, a reduction ratio of between 5:1 and 1.5:1, particularly 2.44:1, is achieved. The transmission device preferably reduces the gear ratio with a ratio of between 50:1 and 20:1, particularly 36.6:1. It is further advantageous if the connection housing is partially tubular or hollow cylindrical. In this case, the connection housing preferably has an interior space. The transmission device is preferably arranged at least partially within the interior of the connection housing.

[0009] It is further advantageous if the connection housing is designed in two parts, in particular if it has two half-shells. The half-shells can be screwed together for assembly. The rotating section is preferably designed in one piece.

[0010] An advantageous aspect of the description provides that the drive unit is designed as an impeller or propeller rotatable about the suction direction. Accordingly, the rotating section can be operated with the suction power, in particular the suction flow, of the suction device. The drive unit is preferably mounted in the connection housing by means of at least one bearing element, in particular at least one ball bearing. Alternatively or additionally, it is conceivable that a further drive unit, in particular a motor, preferably of the suction device, is provided to drive the rotating section.

[0011] An advantageous aspect of the description provides that the drive unit is rotationally fixed to a drive shaft rotatably mounted in the connection housing. The drive shaft is preferably supported by at least one bearing element, in particular at least one ball bearing, and / or indirectly via the mounting of the drive unit in the connection housing. The drive shaft preferably extends parallel to the suction direction.

[0012] An advantageous aspect of the description provides that a first gear element, in particular a worm gear element, is arranged on the drive shaft in a rotationally fixed manner. The first gear element is preferably formed in one piece or in multiple parts with the drive shaft.

[0013] An advantageous aspect of the description provides that the first transmission element interacts with a second transmission element, in particular a gear or worm gear, which is arranged non-rotatably on an intermediate shaft, for power transmission. The intermediate shaft and / or the second transmission element are preferably supported in the connection housing by means of at least one ball bearing. The intermediate shaft preferably extends perpendicular to the suction direction.

[0014] An advantageous aspect of the description provides that a third gear element, in particular a bevel gear, is arranged non-rotatably on the intermediate shaft. The third gear element is preferably formed integrally or in multiple parts with the intermediate shaft. The third gear element is preferably supported by at least one bearing element, in particular at least one ball bearing, and / or indirectly via the bearing of the intermediate shaft in the connecting housing.

[0015] An advantageous aspect of the description provides that a fourth gear element, in particular a bevel gear, is arranged non-rotatably on the rotating section and interacts with the third gear element for power transmission. The rotating section is preferably rotatably mounted in the connecting section. The rotating section is preferably tubular or hollow cylindrical. The rotating section preferably also has a hollow output shaft, particularly one facing away from the connecting section, which can be non-rotatably connected to a cleaning element. The fourth gear element is preferably formed in one piece or in multiple parts with the output shaft.

[0016] The first and second gear elements preferably form a first gear stage of the transmission device, wherein the gear ratio is greater than 1. The third and fourth gear elements preferably form a second gear stage, wherein the gear ratio is greater than 1.

[0017] An advantageous aspect of the description is that a braking device, in particular an eddy current brake, is provided in the connection housing for braking the drive unit and / or the rotating section. This allows the speed of the drive unit and / or the rotating section to be further reduced.

[0018] An advantageous aspect of the description provides that the braking device comprises a brake disc, in particular a metal disc, preferably made of an electrically conductive and / or non-magnetic metal such as copper or aluminum, which is non-rotatably connected to the drive device. Furthermore, the braking device preferably comprises a magnetic element interacting with the brake disc, in particular at least one, preferably two, neodymium magnets. The brake disc is preferably non-rotatably mounted on the drive shaft. The brake disc is preferably rotatable about the suction direction. The magnetic element is preferably fixed in position on the connection housing. An eddy current brake uses the principle of electromagnetic induction to generate a braking effect by means of the magnetic element on the brake disc. When the rotatable brake disc moves in the area of ​​the magnetic element, eddy currents are induced in the brake disc by the magnetic field.These eddy currents in turn generate a magnetic field that opposes the original magnetic field, creating a braking force that slows the rotation of the brake disc. The braking device allows the speed of the cleaning element to be reduced by a further 10% to 30%.

[0019] An advantageous aspect of the description is that a locking device is provided in the connection housing, which can be moved between a locking position to block the rotation of the rotating section and a release position to release the rotation of the rotating section. This allows the rotation of the drive unit and / or the rotating section to be blocked when particularly sensitive parts need to be cleaned that must not be subjected to the rotation of a cleaning element.

[0020] An advantageous aspect of the description provides that the locking device comprises a locking lever accessible from outside the connection housing and an eccentric disc non-rotatably connected to the locking lever, wherein, in the locked position of the locking device, the eccentric disc acts directly or by means of a locking element against the rotating section, in particular against the fourth gear element. The locking element is preferably designed as part of the connection housing, in particular as a flexible tongue formed integrally with the connection housing. In the locked position, the locking element preferably rests against the rotating section. In the released position, the locking element is preferably designed to be spaced parallel to the suction direction and at a distance from the rotating section.

[0021] An advantageous aspect of the description provides that the gear assembly, in particular the first gear element and / or the second gear element, is arranged in a gear section of the connecting housing. The gear section can further be designed as a lubrication reservoir for receiving a lubricant, in particular a grease, for lubricating the gear assembly. The gear assembly and the gear section are designed such that immersion lubrication is provided for the gear assembly, in particular the first gear element and / or the second gear element.

[0022] An advantageous aspect of the description provides that the rotating section is rotatably mounted in the connecting section by means of a fifth ball bearing. For the arrangement of the fifth ball bearing on the rotating section, a press fit is preferably provided on the outer circumference of the output shaft, which is designed with an interference fit relative to the bearing ring of the fifth ball bearing. Furthermore, a raised section extending along the circumference of the output shaft is preferably provided, over which the fifth ball bearing is slid for assembly. During this process, the output shaft deforms elastically radially inwards and / or the fifth ball bearing, in particular the bearing ring, preferably deforms elastically radially outwards and clips into the press fit located behind the raised section along the suction direction. The press fit preferably forms an undercut behind the raised section into which the fifth ball bearing engages.Preferably, the fifth ball bearing is arranged in a bearing receptacle of the connecting section.

[0023] An advantageous aspect of the description provides that a grid element, in particular a ribbed grid, is provided in the connection housing for catching any sucked-in particles, especially small ones. The grid element is preferably formed integrally with the connection housing or in multiple parts. The grid element is preferably arranged along the suction direction downstream of the rotating section and / or upstream of the drive unit and / or in the area of ​​the second gear element and / or the third gear element.

[0024] An advantageous aspect of the description is that the cleaning attachment includes a cleaning element. This cleaning element preferably comprises a brush element for contacting the parts to be cleaned and / or a funnel element for increasing the cross-sectional area of ​​a suction line. The funnel element is preferably flexible, in particular made of silicone, EPDM, soft TPE, or soft PVC. Thus, the parts to be cleaned are protected by the soft design of the funnel element, unlike with hard plastic components. The funnel element is preferably designed such that it can be moved between a distal protrusion and a proximal indentation. This allows, firstly, the suction, especially to distant parts, to be optimized, and secondly, if the cleaning element needs to penetrate deeply into a part, the funnel element can be moved out of the area of ​​contact, thus acting as an obstacle.

[0025] The problem underlying the invention is also solved by a suction device, in particular a vacuum cleaner, preferably a household vacuum cleaner, with the features of claim 16. The invention relates to a suction device comprising: a suction line, a suction drive for generating a suction flow through the suction line along a suction direction, a cleaning attachment according to one of the preceding claims, wherein the cleaning attachment can be arranged upstream and / or in the suction line, and wherein the cleaning attachment can be driven by means of a suction flow through the suction line.

[0026] It is advantageous if the cleaning attachment has a maximum diameter of less than 10 cm, in particular less than 8 cm and preferably less than 5 cm. The diameter of the cleaning attachment preferably runs perpendicular to the suction direction.

[0027] Further advantages, features and details will become apparent from the following description, in which various embodiments of the invention are illustrated with reference to the drawing.

[0028] They show: Fig. 1 a perspective side view of a cleaning attachment according to the invention; Fig. 2 a partial section of the cleaning attachment according to the invention. Fig. 1 ; Fig. 3 a partial view of the cleaning attachment according to Fig. 1 ; Fig. 4 a sectional view of the cleaning attachment according to Fig. 1 ; Fig. 5 shows a further partial section of the cleaning attachment according to Fig. 1 ; Fig. 6 an exploded view of the cleaning attachment according to Fig. 1 with a cleaning element; Fig. 7 a perspective front view of the cleaning attachment according to Fig. 1with a cleaning element in the protruding position; Fig. 8 a perspective view of a cleaning element in the inverting position; and Fig. 9 a schematic sequence for arranging a bearing of the rotating section on the connecting section.

[0029] The cleaning attachment 10 has according to Fig. 1 a connection section 12 for arrangement on and / or in and / or onto a suction line 16 extending along a suction direction 14 of a suction device 100 and a rotation section 18 rotatably arranged on the connection section 12 for receiving a cleaning element 20 according to Figs. 6 to 8The connection section 12 has a connection housing 22 and the rotation section 18 has a rotation housing 24, wherein the connection housing 22 and the rotation housing 24 are at least partially tubular or hollow cylindrical and / or have a cylindrical inner surface. The connection housing 22 is preferably bent and / or angled. The connection housing 22 has according to Fig. 1, 2 and 5 two half-shells 26, which are screwed together at fastening sections during operation. The rotating section 18, in particular the rotating housing 24, is designed according to Fig. 4 and 5 The cleaning attachment 10 is rotatably mounted in the connection section 12, in particular the connection housing 22, by means of a ball bearing. When the cleaning attachment 10 is arranged on the suction line 16, the cleaning attachment 10 serves as an extension of the suction line 16 against the suction direction 14.

[0030] The connection housing 22 has according to Fig. 6 At its proximal end, the rotating housing 24 has a connecting element 28 for connecting the suction line 16 of the suction device. At its distal end, the rotating housing 24 has a receiving element 30 for receiving the cleaning element.

[0031] In the connection housing 22, according to Figs. 2 to 5 A drive unit 32, rotatably mounted about the suction direction 14, is arranged to drive the rotating section 18. The drive unit 32 can be driven by the suction flow flowing in the suction line 16 along the suction direction 14. The drive unit 32 is designed as an impeller rotatable about the suction direction 14. The drive unit 32 is designed according to Fig. 3 The drive unit 32 is connected to the rotating section 18 by means of a two-stage gear unit 34. The gear unit 34 is designed such that the rotational speed of the drive unit 32 is reduced to the rotational speed of the rotating section 18.

[0032] The drive unit 32 is designed according to Fig. 4 and 5 The drive element 38 is arranged non-rotatably on a drive shaft 36. The drive shaft 36 extends parallel to the suction direction 14. A first gear element 38, in particular in the form of a worm gear element, is arranged at the distal end of the drive shaft 36. The drive shaft 36 is rotatably mounted in the connection housing 22 by means of a first bearing element 40, in particular a ball bearing, and a second bearing element 42, in particular a ball bearing. The first bearing element 40 is arranged along the suction direction 14 at the proximal end of the drive shaft 36. The second bearing element 42 is arranged along the suction direction 14 between the drive device 32 and the first gear element 38.

[0033] The first gear element 38 interacts with a second gear element 44, in particular in the form of a worm gear, for power transmission. The first gear element 38 and the second gear element 44 form a first gear stage 46 of the gear assembly 34. The second gear element 44 is designed according to Figs. 3 and 4 The second gear element 44 is arranged in a rotationally fixed manner on an intermediate shaft 48. The intermediate shaft 48 extends perpendicular to the suction direction 14. The second gear element 44 is preferably arranged in the region of the center point of the intermediate shaft 48.

[0034] The connection housing 22 has according to Fig. 4 The transmission section 50 comprises a gear section for receiving the first gear element 38 and the second gear element 44. The gear section 50 preferably includes a lubrication reservoir 52 for receiving a lubricant, in particular a grease. The lubricant preferably serves for immersion lubrication of the first gear stage 46.

[0035] The intermediate shaft 48 is according to Fig. 2 and 3 The intermediate shaft 48 is rotatably mounted at its radially outer, free end in the connecting housing 22 by means of a third bearing element 54, in particular a ball bearing, and a fourth bearing element 56, in particular a ball bearing. Fig. 2 , 3 and 5 A third gear element 58, in particular a bevel gear, is arranged radially outside in the area of ​​the third bearing element 54 in a rotationally fixed manner. The third gear element 58 is preferably arranged between the second gear element 44 and the third bearing element 54.

[0036] The third gear element 58 acts according to Fig. 2 , 3 and 5for load transmission together with a fourth gear element 60, in particular a bevel gear. The third gear element 58 and the fourth gear element 60 form a second gear stage 62 of the gear unit 34. The fourth gear element 60 is formed integrally with the rotating section 18. The fourth gear element 60 is arranged at the proximal end of the rotating section 18. An output shaft 64 is connected to the fourth gear element 60. The output shaft 64 has, according to Fig. 6 and 7 at its distal end the receiving element 30 for receiving the cleaning element 20.

[0037] Rotation section 18 is according to Fig. 4 and 9The fifth ball bearing 88 is rotatably mounted in the connecting section 12 by means of a fifth ball bearing 88. For the arrangement of the fifth ball bearing 88 on the rotating section 18, a press fit 90 is provided on the outer circumference of the output shaft 64, which is designed with an interference fit relative to the bearing ring of the fifth ball bearing 88. Furthermore, a raised section 92 extending along the circumference of the output shaft 64 is provided, over which the fifth ball bearing 88 is slid for assembly. During this process, the output shaft 64 deforms elastically radially inwards and / or the fifth ball bearing 88 deforms elastically radially outwards and clips into the press fit 90, which is arranged along the suction direction 14 behind the raised section 92. The press fit 90 forms an undercut behind the raised section 92, into which the fifth ball bearing 88 engages. Furthermore, according to Fig. 4 and 9Slots 94 are provided along the circumference of the output shaft 64, with the aid of which the output shaft 64 is weakened and the pressing force is adjustable. Preferably the fifth ball bearing 88 is Fig. 4 arranged in a radially inwardly directed bearing receptacle 96 of the connecting section 12.

[0038] The cleaning attachment 10 has according to Fig. 4Furthermore, a braking device 66, in particular an eddy current brake, is arranged in the connection housing 22 for reducing the rotational speed of the drive unit 32 and / or the rotating section 18. The braking device 66 has a brake disc 68 that is non-rotatably connected to the drive unit 32 and a magnetic element 70 that interacts with the brake disc 68. The brake disc 68 is non-rotatably mounted on the drive shaft 36 and rotatably mounted about the suction direction 14. The brake disc 68 is preferably arranged along the suction direction 14 between the drive unit 32 and the second bearing element 42. The magnetic element 70 is fixed in position on the connection housing 22.

[0039] The cleaning attachment 10 has according to Fig. 2 , 3 and 5Furthermore, a locking device 72 is arranged in the connection housing 22 for blocking and releasing the rotation of the rotating section 18. The locking device 72 has a locking lever 74 and an eccentric disc 76 which is non-rotatably connected to the locking lever 74. The locking device 72 is rotatably arranged in the connection housing 22 about a locking axis 78 between a locking position and a release position. The locking axis 78 runs perpendicular to the suction direction 14, in particular coaxially to the intermediate shaft 48. In the locking position, the eccentric disc 76 directly contacts the rotating section 18, in particular the fourth gear element 60, or the eccentric disc 76 presses a locking element 80 of the locking device 72 against the rotating section 18, in particular the fourth gear element 60. The locking element 80 is arranged according to Fig. 5preferably designed as a flexible tongue. The locking element 80 is preferably formed in one piece with the connection housing 22. In the release position, the eccentric disc 76 or the locking element 80 is arranged, in particular parallel to the suction direction 14, at a distance from the rotating section 18.

[0040] In the connection housing 22, according to Fig. 5 A grid element 82, in particular a ribbed grid, is arranged for collecting unwanted, especially small, particles that are drawn in. The grid element 82 is preferably formed integrally with the connection housing 22 or in multiple parts with the connection housing 22. The grid element 82 is preferably arranged along the suction direction 14 behind the rotating section 18 and / or in front of the drive unit 32 and / or in the area of ​​the first gear stage 46 and / or the second gear element 44 and / or the third gear element 58.

[0041] For cleaning small parts with complex geometries, according to Fig. 6 and 7 A cleaning element 20 with a brush element 84 and / or a funnel element 86 can be arranged or is arranged on the rotating section 18, in particular on the receiving element 30. The brush element 84 can be rotated about the suction direction 14 by means of the rotating section 18, so that even complex geometries of small parts can be effectively cleaned and the dirt and dust adhering to them can be extracted by the suction flow. The brush element 84 preferably has a plurality of bristles extending parallel to the suction direction 14. The bristles can preferably be made of a natural and / or synthetic material.

[0042] Furthermore, at rotation section 18 according to Figs. 7 and 8A funnel element 86 can be arranged or is arranged to increase the cross-sectional area of ​​a suction line. The increase in cross-sectional area provided by the funnel element 86 has a beneficial effect on the suction action of the dirt and dust loosened by the brush element 84. The funnel element 86 is preferably flexible, in particular made of silicone, EPDM, soft TPE, or soft PVC. The funnel element 86 is preferably designed such that it is located between a distal protrusion according to Fig. 7 and a proximal invagination plague according to Fig. 8The funnel element 86 is movable. This allows, firstly, the suction, especially to distant parts, to be optimized, and secondly, if the cleaning element 20 needs to penetrate deeply into a part, the funnel element 86 can be moved out of the engagement area as an obstacle. The funnel element 86 is preferably rollable from the extended position to the inward position, whereby the funnel element 86 is displaced radially outwards.

[0043] For operation of the cleaning attachment 10, the cleaning element 20 is arranged on the rotating section 18. Furthermore, the cleaning attachment 10 is arranged along the suction direction 14 in front of a suction line 16 of a suction device 100. Reference symbol list

[0044] 10 Cleaning attachment 12 Connection section 14 Suction direction 16 Suction line 18 Rotation section 20 Cleaning element 22 Connection housing 24 Rotation housing 26 Half shells 28 Connection element 30 Mounting element 32 Drive unit 34 Gear unit 36 ​​Drive shaft 38 First gear element 40 First bearing element 42 Second bearing element 44 Second gear element 46 First gear stage 48 Intermediate shaft 50 Gear section 52 Lubrication reservoir 54 Third bearing element 56 Fourth bearing element 58 Third gear element 60 Fourth gear element 62 Second gear stage 64 Output shaft 66 Brake unit 68 Brake disc 70 Magnet element 72 Locking device 74 Locking lever 76 Eccentric disc 78 Locking axle 80 Locking element 82 Grid element 84 Brush element 86 Funnel element 88 Fifth ball bearing 90 Press fit 92 Raising section 94 Slots 96 Bearing holder 100 Suction device

Claims

1. Cleaning attachment (10) for a suction apparatus (100), comprising a connecting portion (12) for arrangement on and / or in a suction line (16) of the suction apparatus (100) and comprising a rotating portion (18) rotatably arranged on the connecting portion (12) for receiving a cleaning element (20), wherein the connecting portion (12) has a connection housing (22) and a drive device (32) which is rotatably mounted in the connection housing (22) about a suction direction (14) for driving the rotating portion (18), wherein the drive device (32) and the rotating portion (18) are connected by means of a gear device (34) for reducing the rotational speed of the drive device (32).

2. Cleaning attachment (10) according to claim 1, wherein the drive device (32) is designed as an impeller or a propeller.

3. Cleaning attachment (10) according to claim 1 or 2, wherein the drive device (32) is connected for conjoint rotation with a drive shaft (36) that is rotatably mounted in the connection housing (22).

4. Cleaning attachment (10) according to claim 3, wherein a first gear element (38), in particular a worm element, is arranged for conjoint rotation on the drive shaft (36).

5. Cleaning attachment (10) according to claim 4, wherein the first gear element (38) cooperates with a second gear element (44), in particular a gearwheel or worm wheel, which is arranged for conjoint rotation on an intermediate shaft (48), for power transfer.

6. Cleaning attachment (10) according to claim 5, wherein a third gear element (58), in particular a bevel gear, is arranged for conjoint rotation on the intermediate shaft (48).

7. Cleaning attachment (10) according to any of claims 4 to 6, wherein a fourth gear element (60), in particular a bevel gear toothing, is arranged for conjoint rotation on the rotating portion (18) and cooperates with the third gear element (58) for power transfer.

8. Cleaning attachment (10) according to any of the preceding claims, wherein a braking device (66), in particular an eddy current brake, is provided in the connection housing (22) for braking the drive device (32) and / or the rotating portion (18).

9. Cleaning attachment (10) according to claim 8, wherein the braking device (66) comprises a brake disk (68), in particular a metal disk, which is connected for conjoint rotation with the drive device (32), and at least one magnetic element (70), in particular a neodymium magnet, which interacts with the brake disk (68).

10. Cleaning attachment (10) according to any of the preceding claims, wherein a locking device (72) is provided in the connection housing (22), which locking device is displaceable between a blocking position for blocking the rotation of the rotating portion (18) and a release position for allowing the rotation of the rotating portion (18).

11. Cleaning attachment (10) according to claim 10, wherein the locking device (72) has a locking lever (74) accessible from outside the connection housing (22) and an eccentric sheave (76) connected for conjoint rotation with the locking lever (74), wherein, in the blocking position, the eccentric sheave (76) acts directly or by means of a locking element, in particular a flexible tongue of the connection housing (22), against the rotating portion (18), in particular the fourth gear element (60).

12. Cleaning attachment (10) according to any of the preceding claims, wherein the gear device (34), in particular the first gear element (38) and / or the second gear element (44), is arranged in a gear portion (50), wherein, in the gear portion (50), a lubrication reservoir (52), in particular a grease reservoir, is provided for lubricating the gear device (34), in particular by splash lubrication.

13. Cleaning attachment (10) according to any of the preceding claims, wherein the rotating portion (18) is rotatably mounted on the connecting portion (12) by means of a clip-type press-fit connection.

14. Cleaning attachment (10) according to any of the preceding claims, wherein, in the connection housing (22), a grid element (82), in particular a ribbed grid, is provided for collecting suctioned parts.

15. Cleaning attachment (10) according to any of the preceding claims, wherein the cleaning attachment (10) has a cleaning element (20) which has a brush element (84) for contacting the parts to be cleaned and / or a funnel element (86) for enlarging the cross section of a suction line.

16. Suction apparatus (100) comprising: - a suction line (16), - a suction drive for generating a suction flow which flows through the suction line (16) in a suction direction (14), - a cleaning attachment (10) according to any of the preceding claims, wherein the cleaning attachment (10) can be or is arranged in front of and / or in the suction line (16), and wherein the cleaning attachment (10) can be driven by means of a suction flow which flows through the suction line (16).