Cleaning attachment, suction device

Abstract

The invention relates to a cleaning attachment (10) for a suction device, comprising a connecting section (12) for arrangement on and / or in a suction line (16) of the suction device extending along a suction direction (14), and comprising a rotating section (18) rotatably arranged on the connecting section (12) for receiving a cleaning element (20), wherein the connecting section (12) has a connecting housing (22) and a drive device (32) rotatably mounted in the connecting housing (22) about the suction direction (14) for driving the rotating section (18), wherein the drive device (32) and the rotating section (18) are connected by means of a gear device (34) for reducing the speed of the drive device (32). The invention further relates to a suction device (100).

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] DE 10 2019 133 219 A1 discloses an attachment and a method for cleaning a socket with a cleaning element and a drive element for driving the cleaning element, wherein the drive element can be driven by an air stream driven by the vacuum cleaner. DE 84 05 468 U1 discloses a cleaning attachment with an angled suction direction. US 4,686,729 A discloses a washing brush with a water conveyance direction that runs opposite to a suction direction. DE 10 2015 107 877 A1 discloses a carpet brush device with a secondary flow for driving a turbine.

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

[0004] The object underlying the invention is achieved by a cleaning attachment with the features of claim 1. The invention is directed to a cleaning attachment for a suction device, with a connection section for arrangement on a suction line and / or in a suction line of the suction device and with a rotation 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 rotation section, wherein the drive device and the rotation section are connected by means of a gear device for speed reduction of the drive device.

[0005] This allows cleaning to be provided by a rotating cleaning element in addition to the suction power of the suction device. By rotating around the suction direction, the cleaning element can extend along the suction direction, allowing the cleaning attachment to reach hard-to-reach areas of delicate and / or sensitive parts. Due to the speed reduction provided by the gear mechanism, 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, without load and at a medium vacuum cleaner setting, rotate at approximately 40,000 revolutions per minute. The output speed can be adjusted within limits by changing the number of blades and the pitch angle of the blades. At such high speeds, a high-frequency, loud whistling sound is produced. Therefore, a reduction gear is particularly advantageous. On the one hand, the gear device places a load on the impeller due to its rotating masses and internal friction, and on the other hand, it is advantageous for generating usable speeds and torques on the cleaning element. A comfortable output speed for the cleaning element is preferably in the range between 400 and 600 rpm. At higher speeds, the brush bristles spread apart, which negatively impacts the cleaning effect.

[0007] For the purposes of this invention, a suction attachment can also be understood as a suction attachment 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 be 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 collecting 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 gear stage, a reduction ratio preferably occurs in the range between 20:1 and 10:1, in particular 15:1, and / or in the second gear stage in a range between 5:1 and 1.5:1, in particular 2.44:1. The transmission device preferably reduces the ratio with a ratio in the range between 50:1 and 20:1, in particular 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 in the interior space of the connection housing.

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

[0010] An advantageous aspect of the description provides that the drive device is designed as an impeller rotatable about the suction direction or a 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 device 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 device is connected in a rotationally fixed manner to a drive shaft rotatably mounted in the connection housing. The drive shaft is preferably mounted in the connection housing by means of at least one bearing element, in particular at least one ball bearing, and / or indirectly via the drive device's bearing. 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 element, is arranged on the drive shaft in a rotationally fixed manner. The first gear element is preferably formed as one or more parts of 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, arranged in a rotationally fixed manner on an intermediate shaft, for power transmission. The intermediate shaft and / or the second transmission element are preferably mounted 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 on the intermediate shaft in a rotationally fixed manner. The third gear element is preferably formed as one or more parts of the intermediate shaft. The third gear element is preferably mounted in the connecting housing by means of at least one bearing element, in particular at least one ball bearing, and / or indirectly via the bearing of the intermediate shaft.

[0015] An advantageous aspect of the description provides that a fourth gear element, in particular a bevel gear, is arranged on the rotating section in a rotationally fixed manner, which cooperates 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 further comprises a hollow output shaft, in particular facing away from the connecting section, which can be connected in a rotationally fixed manner to a cleaning element. The fourth gear element is preferably formed as one or more parts to form the output shaft.

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

[0017] An advantageous aspect of the description provides that a braking device, in particular an eddy current brake, is provided in the connection housing for braking the drive device and / or the rotating section. This allows the speed of the drive device 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 connected in a rotationally fixed manner to the drive device. Furthermore, the braking device preferably comprises a magnetic element which interacts with the brake disc, in particular at least one, preferably two, neodymium magnets. The brake disc is preferably arranged in a rotationally fixed manner on the drive shaft. The brake disc is preferably rotatable about the suction direction. The magnetic element is preferably arranged in a fixed position on the connection housing. An eddy current brake uses the principle of electromagnetic induction to generate a braking effect on the brake disc by means of the magnetic element. When the rotatable brake disc moves in the region of the magnetic element, eddy currents are generated in the brake disc by the magnetic field.These eddy currents, in turn, generate a magnetic field that counteracts the original magnetic field, creating a braking force that slows the rotation of the brake disc. Using the braking device, the speed of the cleaning element can be reduced by a further 10% to 30%.

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

[0020] An advantageous aspect of the description provides that the locking device has a locking lever accessible from outside the connection housing and an eccentric disc connected to the locking lever in a rotationally fixed manner, wherein the eccentric disc acts against the rotating section, in particular against the fourth gear element, directly or by means of a locking element in the blocking position of the locking device. 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 blocking position, the locking element preferably bears against the rotating section. In the release position, the locking element is preferably designed parallel to the suction direction and spaced from the rotating section.

[0021] An advantageous aspect of the description provides that the transmission device, in particular the first transmission element and / or the second transmission element, is arranged in a transmission section of the connecting housing. The transmission section can further be designed as a lubricant reservoir for receiving a lubricant, in particular a lubricating grease, for lubricating the transmission device. The transmission device and the transmission section are designed such that splash lubrication is provided for the transmission device, in particular the first transmission element and / or the second transmission 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. To arrange the fifth ball bearing on the rotating section, a press fit is preferably provided on the outer circumference of the output shaft, which press fit is designed with an oversize relative to the bearing ring of the fifth ball bearing. Furthermore, a raised section running along the circumference is preferably provided on the outer circumference of the output shaft, over which raised section the fifth ball bearing is pushed for assembly. In this case, the output shaft is elastically deformed radially inwards and / or the fifth ball bearing, in particular the bearing ring, is preferably elastically deformed radially outwards and clips into the press fit arranged 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 collecting sucked-in, in particular small, parts. The grid element is preferably formed as one piece with the connection housing or as multiple parts. The grid element is preferably arranged along the suction direction behind the rotating section and / or upstream of the drive device and / or in the region of the second gear element and / or the third gear element.

[0024] An advantageous aspect of the description provides that the cleaning attachment has a cleaning element. The cleaning element preferably has a brush element for contacting the parts to be cleaned and / or a funnel element for enlarging the cross-section of a suction line. The funnel element is preferably flexible, in particular made of silicone, EPDM, soft TPE, or soft PVC. Accordingly, parts to be cleaned are protected by the soft design of the funnel element, in contrast to hard plastic components. The funnel element is preferably designed such that it can be moved between a distal protrusion position and a proximal retraction position. Accordingly, on the one hand, the suction, in particular to distant parts, can be optimized and, on the other hand, if the cleaning element has to penetrate deeply into a part, the funnel element can be moved out of the engagement area as an obstacle.

[0025] The object underlying the invention is also achieved by a suction device, in particular a vacuum cleaner, preferably a conventional household vacuum cleaner, with the features of claim 16. The invention is directed to a suction device comprising: a suction line, a suction drive for generating a suction flow flowing 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 or is arranged in front of and / or in the suction line, and wherein the cleaning attachment can be driven by means of a suction flow flowing 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, which illustrates various embodiments of the invention with reference to the drawings. The features mentioned in the claims and the description may be essential to the invention individually or in any combination.

[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 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 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 extended position; Fig. 8 shows a perspective view of a cleaning element in the retracted position; and Fig. 9 shows a schematic sequence for arranging a bearing for the rotating section on the connecting section.

[0029] The cleaning attachment 10 has according to Fig. 1 a connecting section 12 for arrangement on and / or in and / or on a suction line 16 of a suction device 100 extending along a suction direction 14 and a rotation section 18 rotatably arranged on the connecting section 12 for receiving a cleaning element 20 according to Fig. 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 according to Fig. 4 and 5 Rotatably mounted by means of a ball bearing in the connection section 12, in particular the connection housing 22. 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 opposite to the suction direction 14.

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

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

[0032] The drive device 32 is according to Fig. 4 and 5 arranged in a rotationally fixed manner 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 element, is arranged on the drive shaft 36 at its distal end. 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 cooperates 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 device 34. The second gear element 44 is according to Figs. 3 and 4 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 of the intermediate shaft 48.

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

[0035] The intermediate shaft 48 is according to Fig. 2 and 3 at its radially outer, free end by means of a third bearing element 54, in particular a ball bearing, and a fourth bearing element 56, in particular a ball bearing, rotatably mounted in the connection housing 22. On the intermediate shaft 48, according to Fig. 2 , 3 and 5 A third gear element 58, in particular a bevel gear, is arranged radially outward in the region 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 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 device 34. The fourth gear element 60 is formed integrally with the rotation section 18. The fourth gear element 60 is arranged at the proximal end of the rotation 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] The rotation section 18 is according to Fig. 4 and 9by means of a fifth ball bearing 88 in the connecting section 12. For arranging 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 oversize to the bearing ring of the fifth ball bearing 88. Furthermore, a raised section 92 running along the circumference is provided on the outer circumference of the output shaft 64, over which raised section the fifth ball bearing 88 is pushed for assembly. In this case, the output shaft 64 deforms elastically radially inward and / or the fifth ball bearing 88 deforms elastically radially outward and clips into the press fit 90 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, by means of which the output shaft 64 is weakened and the pressing force can be adjusted. Preferably, the fifth ball bearing 88 is according to 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, arranged in the connection housing 22 for reducing the speed of the drive device 32 and / or the rotating section 18. The braking device 66 has a brake disc 68 connected in a rotationally fixed manner to the drive device 32 and a magnetic element 70 interacting with the brake disc 68. The brake disc 68 is arranged in a rotationally fixed manner on the drive shaft 36 and rotatable about the suction direction 14. The brake disc 68 is preferably arranged along the suction direction 14 between the drive device 32 and the second bearing element 42. The magnetic element 70 is arranged in a fixed position on the connection housing 22.

[0039] The cleaning attachment 10 has according to Fig. 2 , 3 and 5In addition, a locking device 72 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 connected in a rotationally fixed manner to the locking lever 74. The locking device 72 is arranged in the connection housing 22 so as to be rotatable about a locking axis 78 between a blocking position and a release position. The locking axis 78 runs perpendicular to the suction direction 14, in particular coaxial to the intermediate shaft 48. In the blocking position, the eccentric disc 76 directly contacts the rotating section 18, in particular the fourth gear element 60, or the eccentric disc 76 urges 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 according to Fig. 5preferably designed as a flexible tongue. The locking element 80 is preferably formed integrally with the connection housing 22. In the release position, the eccentric disc 76 or the locking element 80 is arranged at a distance from the rotation section 18, in particular parallel to the suction direction 14.

[0040] In the connection housing 22, according to Fig. 5 A grid element 82, in particular a ribbed grid, is arranged to collect unwanted, in particular small, parts that are sucked in. The grid element 82 is preferably formed as one piece with the connection housing 22 or as multiple parts to the connection housing 22. The grid element 82 is preferably arranged along the suction direction 14 behind the rotation section 18 and / or in front of the drive device 32 and / or in the region 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 a complex geometry, Fig. 6 and 7 A cleaning element 20 with a brush element 84 and / or with a funnel element 86 can be arranged or is arranged on the rotating section 18, in particular on the receiving element 30. By means of the rotating section 18, the brush element 84 can be rotated about the suction direction 14, so that even complex geometries of small parts can be effectively cleaned and the dirt and dust adhering to them can be sucked away 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, the rotation section 18 according to Figs. 7 and 8A funnel element 86 can be arranged or is arranged to increase the cross-section of a suction line. The cross-sectional increase by the funnel element 86 has a beneficial effect on the suction effect 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 can be arranged between a distal protrusion according to Fig. 7 and a proximal invagination position according to Fig. 8is displaceable. Accordingly, on the one hand, the suction, particularly to distant parts, can be optimized, and on the other hand, if the cleaning element 20 must engage deeply into a part, the funnel element 86 can be displaced as an obstacle out of the engagement area. The funnel element 86 can preferably be rolled from the extended position into the retracted position, wherein the funnel element 86 is displaced radially outward.

[0043] To operate 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. List of reference symbols

[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 Receptacle element 32 Drive device 34 Gear device 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 device 68 Brake disc 70 Magnetic element 72 Locking device 74 Locking lever 76 Eccentric disc 78 Locking axis 80 Locking element 82 Grid element 84 Brush element 86 Funnel element 88 Fifth ball bearing 90 Press fit 92 Raised section 94 Slots 96 Bearing holder 100 Suction device

Claims

1. Cleaning attachment (10) for a suction device (100), with a connection section (12) for arrangement on and / or in a suction line (16) of the suction device (100) and with a rotation section (18) rotatably arranged on the connection section (12) for receiving a cleaning element (20), wherein the connection section (12) has a connection housing (22) and a drive device (32) rotatably mounted in the connection housing (22) about a suction direction (14) for driving the rotation section (18), wherein the drive device (32) and the rotation section (18) are connected by means of a gear device (34) for reducing the 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 in a rotationally fixed manner to a drive shaft (36) 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 on the drive shaft (36) in a rotationally fixed manner.

5. Cleaning attachment (10) according to claim 4, wherein the first gear element (38) cooperates with a second gear element (44), in particular a gear or worm gear, arranged on an intermediate shaft (48) in a rotationally fixed manner for power transmission.

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

7. Cleaning attachment (10) according to one of claims 4 to 6, wherein a fourth gear element (60), in particular a bevel gear, is arranged in a rotationally fixed manner on the rotation section (18), which cooperates with the third gear element (58) for power transmission.

8. Cleaning attachment (10) according to one 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 section (18).

9. Cleaning attachment (10) according to claim 8, wherein the braking device (66) has a brake disc (68), in particular a metal disc, which is connected in a rotationally fixed manner to the drive device (32), and at least one magnetic element (70), in particular a neodymium magnet, which interacts with the brake disc (68).

10. Cleaning attachment (10) according to one 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 section (18) and a release position for releasing the rotation of the rotating section (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 disc (76) connected to the locking lever (74) in a rotationally fixed manner, wherein the eccentric disc (76) in the blocking position acts directly or by means of a locking element, in particular a flexible tongue of the connection housing (22), against the rotation section (18), in particular the fourth gear element (60).

12. Cleaning attachment (10) according to one 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 section (50), wherein a lubricating reservoir (52), in particular a grease reservoir, is provided in the gear section (50) for lubricating the gear device (34), in particular by splash lubrication.

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

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

15. Cleaning attachment (10) according to one 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 device (100) comprising: - a suction line (16), - a suction drive for generating a suction flow flowing through the suction line (16) along a suction direction (14), - a cleaning attachment (10) according to one of the preceding claims, wherein the cleaning attachment (10) can be arranged 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 flowing through the suction line (16).

Images