Transmission mechanism and cleaning apparatus

Abstract

A transmission mechanism and a cleaning apparatus. The transmission mechanism comprises a housing (100), a driving structure (200), an output structure (300) and a transmission assembly (400). The output structure (300) is configured to connect to a cleaning element. The transmission assembly (400) comprises a plurality of gear structures, wherein the plurality of gear structures sequentially mesh with each other, one of the gear structures is in transmission connection with the output structure (300), and another gear structure is in transmission connection with the driving structure (200). By means of the transmission assembly (400), the driving structure (200) drives the output structure (300) to move. The housing (100) has an accommodating cavity; the plurality of gear structures are all mounted in the accommodating cavity; and oil blocking structures (110) are provided in the accommodating cavity, and the oil blocking structure (110) surrounds part of the periphery of each gear structure.

Description

Transmission mechanism and cleaning device

[0001] Cross Reference to Related Applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202421531002.9, filed on July 01, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of cleaning devices, and more particularly, to a transmission mechanism and a cleaning device. BACKGROUND

[0004] With the development of technology, various cleaning devices have appeared. The cleaning devices can complete cleaning work and save the time of users.

[0005] The cleaning device includes a driving component, a transmission component, and a cleaning component. The driving component drives the cleaning component to perform cleaning operation through the transmission component. The transmission component includes multiple gears. As the use time of the gears becomes longer, the wear of the gears intensifies, thereby affecting the use stability of the cleaning device.

[0006] SUMMARY

[0007] Embodiments of the present disclosure aim to provide a transmission mechanism and a cleaning device, and aim to solve the technical problem of relatively poor use stability of the cleaning device in the related art.

[0008] To achieve the above-mentioned purpose, the technical solution adopted by the present disclosure is:

[0009] An embodiment of the first aspect of the present disclosure provides a transmission mechanism for a cleaning device. The transmission mechanism includes a housing, a driving structure, an output structure, and a transmission assembly. The output structure is used to connect a cleaning element. The transmission assembly includes multiple gear structures. The multiple gear structures are sequentially meshed. One of the gear structures is in transmission connection with the output structure, and another gear structure is in transmission connection with the driving structure. The driving structure drives the output structure to move through the transmission assembly. The housing has a receiving cavity. The multiple gear structures are all installed in the receiving cavity. An oil blocking structure is arranged in the receiving cavity. The oil blocking structure surrounds a part of the periphery of at least part of the gear structures.

[0010] In some embodiments, the housing includes a first shell and a second shell. The first shell is installed on one side of the second shell in a first direction. The first direction is parallel to the axial direction of the gear structure. The first shell and the second shell surround the receiving cavity. At least one of the first shell and the second shell is provided with the oil blocking structure.

[0011] In some embodiments, the first shell is provided with a first enclosing wall, and the second shell is provided with a second enclosing wall, the first enclosing wall and the second enclosing wall are both closed annular structures, one of the first enclosing wall and the second enclosing wall is provided with an annular groove, and the other is provided with an annular protrusion, the annular protrusion is located in the annular groove, and the first enclosing wall and the second enclosing wall enclose a receiving cavity.

[0012] In some embodiments, the plurality of gear structures includes a first gear structure, a second gear structure, a third gear structure, a fourth gear structure, and a fifth gear structure, the first gear structure is in transmission connection with the driving structure, the fifth gear structure is in transmission connection with the output structure, the second gear structure includes a second upper gear portion and a second lower gear portion coaxially connected in the first direction, the third gear structure includes a third upper gear portion and a third lower gear portion coaxially connected in the first direction, the fourth gear structure includes a fourth upper gear portion and a fourth lower gear portion coaxially connected in the first direction, the first gear structure is in meshing connection with the second lower gear portion, the second upper gear portion is in meshing connection with the third upper gear portion, the third lower gear portion is in meshing connection with the fourth lower gear portion, and the fourth upper gear portion is in meshing connection with the fifth gear structure.

[0013] In some embodiments, the first gap is located between the third upper gear and the third lower gear, a portion of the second lower gear portion is located in the first gap, and a portion of the fourth upper gear portion is located in the first gap.

[0014] In some embodiments, the first shell has a first region and a second region, the first region is opposite to the first gear structure, the second gear structure, and the third gear structure, the second region is opposite to the fourth gear structure and the fifth gear structure, and a wall surface on a side of the first region away from the receiving cavity has a height difference with a wall surface on a side of the second region away from the receiving cavity.

[0015] In some embodiments, the first gear structure and the second lower gear portion each include a helical gear.

[0016] In some embodiments, the first shell and the second shell are respectively provided with a reinforcing rib, and the reinforcing rib is connected with the oil blocking structure.

[0017] In some embodiments, the driving structure includes a brushless motor.

[0018] Embodiments of the second aspect of the present disclosure provide a cleaning device, including a cleaning element and a transmission mechanism provided by any of the embodiments of the first aspect described above, the cleaning element is mounted on the output structure of the transmission mechanism.

[0019] Compared with the related art, the present disclosure at least includes the following beneficial effects:

[0020] The transmission mechanism provided by the embodiments of the present disclosure comprises a transmission assembly for transmitting driving force provided by a driving structure to an output structure. The transmission assembly comprises a plurality of gear structures, and the plurality of gear structures are all installed in a containing cavity of a shell. Since an oil blocking structure is arranged in the containing cavity, the oil blocking structure surrounds a part of the periphery of the gear structure. During the operation of the transmission mechanism, at least part of the lubricating grease that is thrown out by the centrifugal force generated by the gear structure during rotation is thrown to the side of the oil blocking structure facing the gear structure. On the one hand, the oil blocking structure reduces the amount of lubricating grease that is thrown out to a relatively long distance from the gear structure; on the other hand, as the lubricating grease accumulates on the oil blocking structure, the thickness of the lubricating grease layer on the oil blocking structure increases, and the distance between the gear structure and the oil blocking structure decreases. During the rotation of the gear structure, the gear structure is in contact with the lubricating grease accumulated on the oil blocking structure, thereby improving the lubricating effect of the gear structure. As can be seen from the above, the transmission mechanism provided by the embodiments of the present disclosure can prolong the lubricating time of the gear structure, improve the lubricating effect of the gear structure after relatively long operation, and improve the use stability of the cleaning device using the transmission mechanism.

[0021] The cleaning device provided by the embodiments of the present disclosure comprises the above-mentioned transmission mechanism, and therefore comprises all the beneficial effects of the above-mentioned transmission mechanism, which will not be described herein again. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments or related description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] FIG. 1 is a schematic view of the appearance of the transmission mechanism provided by the embodiments of the present disclosure;

[0024] FIG. 2 is a schematic view of the assembly of the transmission assembly, the driving structure and the output structure on the second shell provided by the embodiments of the present disclosure;

[0025] FIG. 3 is a bottom view of the transmission mechanism provided by the embodiments of the present disclosure;

[0026] FIG. 4 is a schematic view of the structure of the second shell provided by the embodiments of the present disclosure;

[0027] FIG. 5 is a top view of the second shell provided by the embodiments of the present disclosure;

[0028] FIG. 6 is a bottom view of the first shell provided by the embodiments of the present disclosure;

[0029] FIG. 7 is a schematic view of the assembly of the transmission assembly, the driving structure and the output structure provided by the embodiments of the present disclosure;

[0030] Fig. 8 is a side view of a transmission assembly according to an embodiment of the present disclosure;

[0031] Fig. 9 is a side view of a first housing according to an embodiment of the present disclosure;

[0032] Fig. 10 is an exploded view of an output structure according to an embodiment of the present disclosure;

[0033] Fig. 11 is an exploded view of a transmission mechanism according to an embodiment of the present disclosure.

[0034] The reference numerals in the above drawings are listed as follows:

[0035] 100, housing; 110, oil blocking structure; 120, first housing; 121, first enclosing wall; 122, annular protrusion; 123, reinforcing rib; 124, first region; 125, second region; 130, second housing; 131, second enclosing wall; 132, annular groove; 133, vibration isolation structure; 134, first through hole; 135, first opening; 140, second self-tapping screw; 200, driving structure; 210, machine screw; 300, output structure; 310, first self-tapping screw; 320, retainer; 330, elastic member; 340, assembly member; 350, moving member; 360, cooperating member; 400, transmission assembly; 410, first gear structure; 420, second gear structure; 421, second upper gear portion; 422, second lower gear portion; 430, third gear structure; 431, third upper gear portion; 432, third lower gear portion; 433, first gap; 440, fourth gear structure; 441, fourth upper gear portion; 442, fourth lower gear portion; 450, fifth gear structure; 461, first bearing; 462, second bearing; 470, roller; 500, sensor. DETAILED DESCRIPTION

[0036] In order to make the technical problems solved by the present disclosure, the technical solutions and the beneficial effects more clearly understood, the present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and not used to limit the present disclosure.

[0037] In the description of the embodiments of the present disclosure, unless specifically defined and limited otherwise, the technical terms "mounting", "connection", "connecting", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0038] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like, indicate directions or positions based on the directions or positions shown in the drawings, and are used for convenience of description and simplification of description only, and do not indicate or imply that the referred structures or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present disclosure.

[0039] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0040] The embodiments of the present disclosure provide a transmission mechanism and a cleaning device. The transmission mechanism is applied to the cleaning device, which can be a scrubber, a sweeping robot, a sweeping and mopping robot, etc., and the embodiments of the present disclosure are not limited.

[0041] FIG. 1 is an appearance schematic diagram of a transmission mechanism provided by the embodiments of the present disclosure, and FIG. 2 is an assembly schematic diagram of a transmission assembly, a driving structure and an output structure on a second shell. As shown in FIGS. 1 and 2, the transmission mechanism includes a shell 100, a driving structure 200, an output structure 300 and a transmission assembly 400. The output structure 300 is used to connect a cleaning element, the cleaning element is used to perform a cleaning operation, and the cleaning element can be a brush body, a mop or the like. The driving structure 200 is used to provide a driving force, and the transmission assembly 400 is used to transmit the driving force of the driving structure 200 to the output structure 300, so as to drive the cleaning element to move through the output structure 300, thereby realizing the cleaning operation. Exemplarily, the output structure 300 can be used to drive the cleaning element to rotate or move. In a specific example, the output structure 300 can drive the cleaning element to rotate, and the output structure 300 can drive the cleaning element to move in a first direction. The first direction is parallel to the axial direction of the gear structure. In the present embodiment, the transmission mechanism is further explained and described by taking the first direction as the vertical direction (up-down direction) as an example.

[0042] The shell 100 has a receiving cavity, and the transmission assembly 400 is installed in the receiving cavity. In an example, the driving structure 200 can also be installed in the receiving cavity. In another example, the driving structure 200 can be installed outside the receiving cavity, and an output shaft of the driving structure 200 extends into the receiving cavity to be in transmission connection with the transmission assembly 400.

[0043] In one example, the output structure 300 can be installed in the accommodating cavity, one end of the cleaning element extends into the accommodating cavity to connect with the output structure 300. In another example, the output structure 300 can be installed in the accommodating cavity, and part of the output structure 300 extends out of the accommodating cavity to connect with the cleaning element. In yet another example, the output structure 300 is installed outside the accommodating cavity, and part of the output structure 300 extends into the accommodating cavity to be in driving connection with the transmission assembly 400.

[0044] In one specific embodiment, the transmission assembly 400 is installed in the accommodating cavity, the driving structure 200 is installed outside the accommodating cavity, and the driving structure 200 is connected with the housing 100, the output shaft of the driving structure 200 extends into the accommodating cavity to be in driving connection with the transmission assembly 400. The output structure 300 is installed outside the accommodating cavity, and the output structure 300 is connected with the housing 100, part of the output structure 300 extends into the accommodating cavity to be in driving connection with the transmission assembly 400.

[0045] The connection between the driving structure 200 and the housing 100 can be connected by welding, screw connection, bonding or buckle connection, etc. The connection between the output structure 300 and the housing 100 can be connected by welding, welding, screw connection, bonding or buckle connection, etc. In one example, the driving structure 200 and the housing 100, the output structure 300 and the housing 100 are connected by screws. The connection between the driving structure 200 and the housing 100, and the connection between the output structure 300 and the housing 100 by screws can simplify the installation process and improve the assembly efficiency. In one specific example, as shown in FIG. 2, the driving structure 200 and the housing 100 are connected by a plurality of machine tooth screws 210, as shown in FIG. 3, the output structure 300 and the housing 100 are connected by a plurality of first self-tapping screws 310. The pitch of the machine tooth screw 210 is relatively small, so that the machine tooth screw 210 can withstand a larger tensile force and shear force, improving the stability and durability of the connection between the driving structure 200 and the housing 100. The self-tapping screw does not need to be pre-threaded at the installation position, simplifying the installation process and improving the assembly efficiency between the output structure 300 and the housing 100.

[0046] The transmission assembly 400 includes a plurality of gear structures, and the plurality of gear structures are in meshing connection. The transmission assembly 400 includes at least two gear structures, one of which is in driving connection with the output structure 300, and the other is in driving connection with the driving structure 200. The transmission assembly 400 can also include three or more gear structures. When the number of gear structures included in the transmission assembly 400 is greater than two, the plurality of gear structures are in meshing connection, and among the two gear structures at both ends of the plurality of gear structures, one is in driving connection with the output structure 300, and the other is in driving connection with the driving structure 200.

[0047] The housing 100 has a receiving cavity, a plurality of gear structures are installed in the receiving cavity, and an oil retaining structure 110 is arranged in the receiving cavity and surrounds a partial area of the periphery of at least one of the gear structures. Since the number of gear structures is plural, the oil retaining structure 110 can be arranged in the partial area of the periphery of one of the gear structures. Alternatively, the oil retaining structure 110 can be arranged in the partial area of the periphery of several of the gear structures. Alternatively, the oil retaining structure 110 can be arranged in the partial area of the periphery of all of the gear structures.

[0048] The oil retaining structure 110 is arranged in the partial area of the periphery of the gear structure. Since the adjacent gear structures are engaged with each other, the oil retaining structure 110 is not arranged in the partial area of the periphery of the gear structure where the gear structure is engaged with another gear structure or gear structures, but is arranged in the partial area of the periphery of the non-engaged area of the gear structure.

[0049] The oil retaining structure 110 is arranged adjacent to the gear structure, and there is a gap between the oil retaining structure 110 and the gear structure, i.e., the oil retaining structure 110 and the gear structure are not in contact with each other. Exemplarily, the gap between the oil retaining structure 110 and the gear structure can be 0.5-1 mm. The oil retaining structure 110 can be a partial area of the inner wall of the receiving cavity adjacent to the gear structure, or the oil retaining structure 110 can be a plate-shaped structure arranged in the receiving cavity. When the gear structure is arranged close to the inner wall of the receiving cavity, the partial area of the inner wall of the receiving cavity adjacent to the gear structure can be arranged as the oil retaining structure 110. When the gear structure is arranged away from the inner wall of the receiving cavity, a plate-shaped oil retaining structure 110 can be arranged in the receiving cavity so that the oil retaining structure 110 can be arranged adjacent to the gear structure. In the case that the oil retaining structure 110 includes a partial area of the inner wall of the receiving cavity, the occupied space of the oil retaining structure 110 can be saved, and the utilization rate of the receiving cavity can be improved. In the case that the oil retaining structure 110 includes a plate-shaped structure arranged in the receiving cavity, the plate-shaped structure can play a role of strengthening the structural strength in the receiving cavity, and the structural strength of the housing 100 can be improved.

[0050] In the embodiments of the present disclosure, since the oil retaining structure 110 is arranged, during the rotation of the gear structure, part of the lubricating grease is thrown to the side of the oil retaining structure 110 facing the gear structure due to the centrifugal force generated in the rotation of the gear structure, and the amount of lubricating grease thrown to the area away from the gear structure is reduced. With the accumulation of the lubricating grease on the oil retaining structure 110, the gear structure contacts the lubricating grease on the oil retaining structure 110 during the rotation and scrapes the lubricating grease off the oil retaining structure 110, so that the lubricating grease returns to the tooth surface of the gear structure, thereby increasing the lubricating effect of the gear structure.

[0051] To facilitate the installation of the transmission assembly 400 in the accommodating cavity, the housing 100 may, for example, be connected by a multi-part structure, for example, the housing 100 may be connected by a two-part structure, or a three-part structure or more. The multi-part structure cooperatively defines the accommodating cavity.

[0052] As shown in FIGS. 4-6, in one specific example, the housing 100 includes at least two parts, referred to as a first housing 120 and a second housing 130. In some embodiments, the housing 100 includes the first housing 120 and the second housing 130, the first housing 120 is mounted on one side of the second housing 130 in a first direction, the first direction is parallel to the axial direction of the gear structure; the first housing 120 and the second housing 130 cooperatively define the accommodating cavity, and at least one of the first housing 120 and the second housing 130 is provided with the oil retaining structure 110.

[0053] The first housing 120 and the second housing 130 are fixedly connected and cooperatively define the accommodating cavity. In this way, the transmission assembly 400 can be first installed in at least one of the first housing 120 and the second housing 130, and then the other is connected with the former and cooperatively defines the accommodating cavity, so that the transmission assembly 400 is located in the accommodating cavity. In this arrangement, the operating space is relatively larger during the connection of the transmission assembly 400 and the housing 100.

[0054] The connection between the first housing 120 and the second housing 130 can be detachable or non-detachable. The first housing 120 and the second housing 130 can be connected by welding, bonding, screw connection or clamping, etc.

[0055] The gear structure in the transmission assembly 400 is partially located in the first housing 120 and partially located in the second housing 130. The first housing 120 is provided with the oil retaining structure 110 corresponding to each gear structure, and the second housing 130 is provided with the oil retaining structure 110 corresponding to each gear structure. The oil retaining structure 110 in the first housing 120 and the oil retaining structure 110 in the second housing 130 can be arranged oppositely or not oppositely.

[0056] In some embodiments, the first shell 120 is provided with a first enclosing wall 121, and the second shell 130 is provided with a second enclosing wall 131. The first enclosing wall 121 and the second enclosing wall 131 are both closed annular structures. One of the first enclosing wall 121 and the second enclosing wall 131 is provided with an annular groove 132, and the other is provided with an annular protrusion 122. The annular protrusion 122 is located in the annular groove 132. The first enclosing wall 121 and the second enclosing wall 131 form a side wall of the accommodating cavity. In this arrangement, the first enclosing wall 121 and the second enclosing wall 131 are stacked in the radial direction perpendicular to the first direction to form the side wall of the accommodating cavity. The cooperation of the annular protrusion 122 and the annular groove 132 allows the first enclosing wall 121 and the second enclosing wall 131 to have an overlapping area in the direction perpendicular to the first direction, thereby improving the sealing performance of the accommodating cavity. The first enclosing wall 121 and the second enclosing wall 131 can block the lubricating grease on the gear structure from splashing outside the accommodating cavity, thereby to some extent alleviating the problem of oil overflow of the transmission mechanism, improving the cleanliness of the area outside the transmission mechanism of the cleaning equipment having the transmission mechanism, improving the use stability of the cleaning equipment, and improving the user experience of the cleaning equipment.

[0057] In one embodiment, the first enclosing wall 121 is provided with the annular protrusion 122, and the second enclosing wall 131 is provided with the annular groove 132. In another embodiment, the first enclosing wall 121 is provided with the annular groove 132, and the second enclosing wall 131 is provided with the annular protrusion 122.

[0058] In some embodiments, the first shell 120 and the second shell 130 are respectively provided with reinforcing ribs 123. As shown in FIGS. 4-6, the reinforcing ribs 123 in the first shell 120 can be arranged between the first enclosing wall 121 and the oil blocking structure 110, and the reinforcing ribs 123 in the second shell 130 can be arranged between the second enclosing wall 131 and the oil blocking structure 110. The reinforcing ribs 123 can be columnar structures, plate structures, or block structures. The reinforcing ribs 123 are arranged in the area of the accommodating cavity where no gear structure and oil blocking structure 110 are installed. In the first shell 120, a plurality of reinforcing ribs 123 can be arranged, and the reinforcing ribs 123 are arranged at intervals. The arrangement of the reinforcing ribs 123 improves the structural strength of the first shell 120 and the second shell 130, and improves the deformation resistance of the first shell 120 and the second shell 130. For example, the first shell 120 and the second shell 130 can be made of plastic material and are relatively light in weight. After the reinforcing ribs 123 are arranged, the deformation resistance of the first shell 120 and the second shell 130 is enhanced, and the protection capability of the transmission assembly 400 in the accommodating cavity is enhanced.

[0059] In some embodiments, as shown in FIG. 4 and FIG. 5, the second shell 130 is provided with a second surrounding wall 131, the inner wall and the outer wall of the second surrounding wall 131 are both curved surface structures, the inner wall of the second surrounding wall 131 is used for surrounding to form a containing cavity, that is, the inner wall of the second surrounding wall 131 is part of the inner wall of the containing cavity. The inner wall surface of the second surrounding wall 131 includes a plurality of curved surfaces, and part of the inner wall surface of the second surrounding wall 131 is adjacent to the gear structure, which serves as an oil blocking structure 110 and plays a role in blocking oil for the gear structure. The second shell 130 is also provided with an oil blocking structure 110 independent of the second surrounding wall 131, and the oil blocking structure 110 is an arc-shaped plate structure. The arc-shaped plate-shaped oil blocking structure 110 can be connected with the second surrounding wall 131. The arc-shaped plate-shaped oil blocking structure 110 and the second surrounding wall 131 can also be provided with a reinforcing rib 123 therebetween. The reinforcing rib 123 can be provided on the side of the oil blocking structure 110 away from the corresponding gear structure, and the extension direction of the reinforcing rib 123 is the radial direction of the gear structure. The reinforcing rib 123 can be distributed radially on the side of the oil blocking structure 110 away from the corresponding gear structure.

[0060] The second shell 130 can be used to fix the transmission mechanism at the mounting position of the cleaning equipment. Exemplarily, the second shell 130 can be connected with the mounting position of the cleaning equipment through bolts. A first through hole 134 can be provided on the second shell 130, and the first through hole 134 is used for the bolts to pass through, so as to facilitate the assembly of the second shell 130 at the mounting position of the cleaning equipment.

[0061] In some embodiments, a vibration isolation structure 133 can be installed on the second shell 130, and the vibration isolation structure 133 is located between the bolt and the second shell 130 to play a buffering and cushioning role for the bolt, improve the connection stability of the second shell 130 at the mounting position of the cleaning equipment, and can reduce the vibration transmitted by the second shell 130 to the mounting position of the cleaning equipment. In addition, the vibration isolation structure 133 plays a certain pre-tightening role, and after the bolt is worn after long-term use, the vibration isolation structure 133 is supported between the vibration isolation structure 133 and the bolt, thereby improving the connection stability of the bolt. The vibration isolation structure 133 can be made of rubber, silicone or other materials with certain elasticity. The vibration isolation structure 133 can be a cylindrical structure, and the inner hole of the cylindrical structure is used for the bolt to pass through. The vibration isolation structure 133 is installed on the outer side region of the second surrounding wall 131 away from the containing cavity. A plurality of vibration isolation structures 133 can be installed on the second shell 130, and the plurality of vibration isolation structures 133 are used for the plurality of bolts to pass through, so that the second shell 130 can be fixed at the mounting position of the cleaning equipment through the plurality of bolts. The vibration isolation structure 133 and the second shell 130 can be connected by bonding, clamping, interference fit, etc. In some examples, the vibration isolation structure 133 passes through the first through hole 134, the inner hole of the vibration isolation structure 133 and the first through hole 134 are coaxially arranged, and the bolt passes through the inner hole of the vibration isolation structure 133. The vibration isolation structure 133 and the first through hole 134 are connected by interference fit.

[0062] In one embodiment, the first through hole 134 is provided with a first opening 135, the first opening 135 is located at a partial area of the radial side of the first through hole 134, and the first opening 135 corresponds to an angle of a central angle less than 180 degrees. For example, the first opening 135 corresponds to an angle of a central angle less than 45 degrees. In this way, the vibration isolation structure 133 can be assembled into the first through hole 134 through the first opening 135. When the vibration isolation structure 133 passes through the first opening 135, the vibration isolation structure 133 is deformed by extrusion, and when the vibration isolation structure 133 moves into the first through hole 134 through the first opening 135, the shape of the vibration isolation structure 133 is restored, and the outer wall of the vibration isolation structure 133 is in contact with the inner wall of the first through hole 134. After the bolt is threaded through the inner hole of the vibration isolation structure 133, the inner and outer sides of the vibration isolation structure 133 are limited by the bolt and the inner wall of the first through hole 134, respectively, so that the vibration isolation structure is limited in the first through hole 134.

[0063] As shown in FIG. 6, the first shell 120 is provided with a first surrounding wall 121, the inner wall and the outer wall of the first surrounding wall 121 are both curved surface structures, the inner wall of the first surrounding wall 121 is used to surround to form a containing cavity, that is, the inner wall of the first surrounding wall 121 is a partial area of the inner wall of the containing cavity. The inner wall surface of the first surrounding wall 121 includes a plurality of arc surfaces, and a partial area of the inner wall surface of the first surrounding wall 121 is adjacent to the gear structure, which serves as the oil retaining structure 110 and plays a role of retaining oil for the gear structure. The first shell 120 is also provided with an oil retaining structure 110 independent of the first surrounding wall 121, and the oil retaining structure 110 is an arc-shaped plate structure. The arc-shaped plate-shaped oil retaining structure 110 can be connected with the first surrounding wall 121. The arc-shaped plate-shaped oil retaining structure 110 and the first surrounding wall 121 can also be provided with a reinforcing rib 123 therebetween. The reinforcing rib 123 can be provided on the side of the oil retaining structure 110 away from the corresponding gear structure, and the extension direction of the reinforcing rib 123 is the radial direction of the gear structure. The reinforcing rib 123 can be distributed radially on the side of the oil retaining structure 110 away from the corresponding gear structure.

[0064] In some embodiments, the plurality of gear structures comprises a first gear structure 410, a second gear structure 420, a third gear structure 430, a fourth gear structure 440 and a fifth gear structure 450, the first gear structure 410 is in driving connection with the driving structure 200, the fifth gear structure 450 is in driving connection with the output structure 300, the second gear structure 420 comprises a second upper gear part 421 and a second lower gear part 422 coaxially connected in the first direction, the third gear structure 430 comprises a third upper gear part 431 and a third lower gear part 432 coaxially connected in the first direction, the fourth gear structure 440 comprises a fourth upper gear part 441 and a fourth lower gear part 442 coaxially connected in the first direction, the first gear structure 410 is in meshing with the second lower gear part 422, the second upper gear part 421 is in meshing with the third upper gear part 431, the third lower gear part 432 is in meshing with the fourth lower gear part 442, and the fourth upper gear part 441 is in meshing with the fifth gear structure 450.

[0065] It is worth mentioning that the second gear structure 420, the third gear structure 430 and the fourth gear structure 440 are all double gear structures, each of which comprises two gear parts arranged in the axial direction, the two gear parts are coaxially arranged and connected, and the two gear parts rotate synchronously. In the present embodiment, the upper gear part is the gear part closer to the first housing 120 among the two gear parts, and the lower gear part is the gear part closer to the second housing 130 among the two gear parts. When the first direction is the up-down direction, the upper gear part is located above the lower gear part.

[0066] The transmission assembly 400 transmits power between the driving structure 200 and the output structure 300, so on the one hand, it can make the installation space of the output structure 300 and the driving structure 200 optional range large, that is, the output structure 300 can be installed at a relatively far position from the driving structure 200, and power transmission is realized through the transmission assembly 400, on the other hand, the speed reduction and force increasing effect can be realized by adjusting the transmission ratio of the relatively meshing gear structures.

[0067] In the embodiment, the first gear structure 410 has a smaller number of teeth than the second lower gear part 422, the second upper gear part 421 has a smaller number of teeth than the third upper gear part 431, the third lower gear part 432 has a smaller number of teeth than the fourth lower gear part 442, and the fourth upper gear part 441 has a smaller number of teeth than the fifth gear structure 450. Since the second upper gear part 421 and the second lower gear part 422 rotate synchronously at the same speed, the third upper gear part 431 and the third lower gear part 432 rotate synchronously at the same speed, and the fourth upper gear part 441 and the fourth lower gear part 442 rotate synchronously at the same speed, the multi-stage speed reduction and torque increase are realized in the process that the first gear structure 410 of the transmission assembly 400 transmits power to the fifth gear structure 450. In the embodiment, the first gear structure 410 has a smaller outer diameter than the second lower gear part 422, the second upper gear part 421 has a smaller outer diameter than the third upper gear part 431, the third lower gear part 432 has a smaller outer diameter than the fourth lower gear part 442, and the fourth upper gear part 441 has a smaller outer diameter than the fifth gear structure 450. In this arrangement, the transmission assembly 400 has a more compact structure and occupies a relatively smaller space.

[0068] In some embodiments, the driving structure 200 comprises a brushless motor. The brushless motor adopts electronic commutation technology, uses a permanent magnet rotor and an electronic controller to realize the conversion of electric energy into mechanical energy, and does not need to set a brush. Since the brushless motor does not have a brush, it does not need to maintain and update the brush, improves the working life of the brushless motor, and thus can improve the service life of the transmission mechanism. The brushless motor does not need to transfer current through physical contact by a brush, thus reducing the wear of the brushless motor and reducing the operating noise.

[0069] The driving structure 200 has an output shaft, the output shaft is rotatable, the output shaft is in transmission connection with the first gear structure 410, and the output shaft can drive the first gear structure 410 to rotate. For example, the first gear structure 410 has a second through hole, the first gear structure 410 is sleeved on the output shaft through the second through hole, the output shaft is in interference fit with the second through hole, so that the first gear structure 410 is fixedly connected with the output shaft. The first gear structure 410 is coaxially arranged with the output shaft.

[0070] The output shaft of the driving structure 200 can be rotated forward and backward. The rotation speed of the driving structure 200 can be adjusted by adjusting the duty cycle of the driving structure 200, so as to finally adjust the rotation speed of the cleaning element connected with the output structure 300, so as to realize cleaning operation of different gears by the cleaning element. Within a certain rotation speed range, the greater the rotation speed of the cleaning element, the stronger the cleaning strength. In this way, different cleaning strengths can be selected according to the dirt degree of the surface to be cleaned. In some arrangement modes, a plurality of cleaning gears can be provided for the user to select, for example, four cleaning gears, and the rotation speeds of the cleaning elements of the four cleaning gears are different. Exemplarily, the four gears are maximum gear 200 RPM (Revolutions Per Minute), strong gear 170 RPM, standard gear 140 RPM and silent gear 100 RPM. In other examples, two, three, five or more cleaning gears can be provided. In some examples, the cleaning element can be provided with stepless speed regulation, that is, the rotation speed of the cleaning element is increased or decreased within a set range by increasing or decreasing, so as to obtain more cleaning gears. The maximum rotation speed and the minimum rotation speed of the driving structure 200 can be limited, so that the rotation speed of the cleaning element is within the maximum rotation speed and the minimum rotation speed of the cleaning element, that is, the rotation speed of the cleaning element is within a set range.

[0071] As shown in FIGS. 7 and 8, the first gear structure 410 and the second lower gear portion 422 each include a helical gear. Specifically, the first gear structure 410 and the second lower gear portion 422 each include a helical spur gear, which has a higher transmission efficiency than a straight spur gear and a worm gear. The tooth surface of the helical gear is helical, and the tooth surfaces of two helical gears gradually contact when meshing, thereby reducing impact and noise, making transmission more stable, and reducing energy loss when meshing, so that the helical gear has higher transmission efficiency.

[0072] As shown in FIG. 8, the third upper gear portion 431 and the third lower gear portion 432 have a first gap 433 therebetween, a portion of the second lower gear portion 422 is located within the first gap 433, and a portion of the fourth upper gear portion 441 is located within the first gap 433. It is worth noting that the third upper gear portion 431 is adjacent to a first plane on which a surface of the third lower gear portion 432 is located, and the third lower gear portion 432 is adjacent to a second plane on which a surface of the third upper gear portion 431 is located, and the first gap 433 is located between the first plane and the second plane. Since a portion of the fourth upper gear portion 441 is located within the first gap 433, the height of the fourth upper gear portion 441 is less than the height of the third upper gear portion 431, and since the fifth gear structure 450 is engaged with the fourth upper gear portion 441, the height of the fifth gear structure 450 is consistent with the height of the fourth upper gear portion 441, and the height of the fifth gear structure 450 is also less than the height of the third upper gear portion 431, and the fourth upper gear portion 441 and the fifth gear structure 450 are located adjacent to each other, and thus a certain space is provided above the fourth upper gear portion 441 and the fifth gear structure 450. It is worth noting that the height of the gear structure in the present embodiment is the distance in the first direction between the top surface of the gear structure (away from the second housing 130 in the first direction) and a reference plane perpendicular to the first direction, and the plane is located on the side of all gear structures away from the first housing 120. For example, when the transmission mechanism is applied to a cleaning device, and the cleaning device is placed on the ground, the ground is a horizontal plane, and the first direction is a vertical plane, the ground can be used as the reference plane. Alternatively, when the bottom surface of the accommodating cavity (the wall surface away from the first housing 120 in the first direction) is a plane perpendicular to the first direction, the bottom surface of the accommodating cavity can be used as the reference plane.

[0073] As shown in FIG. 9, the first housing 120 has a first region 124 opposite the first gear structure 410, the second gear structure 420, and the third gear structure 430, and a second region 125 opposite the fourth gear structure 440 and the fifth gear structure 450. The wall surface on the side of the first region 124 away from the accommodating cavity is at a different height from the wall surface on the side of the second region 125 away from the accommodating cavity. Because there is a certain space above the fourth upper gear portion 441 and the fifth gear structure 450, the distance between the first housing 120 and the fourth upper gear portion 441, and the distance between the first housing 120 and the fifth gear structure 450 can be set relatively close. Thus, the surface (upper surface) on the side of the first housing 120 away from the accommodating cavity has a height difference. The region with a higher upper surface is referred to as the first region 124, and the region with a lower upper surface is referred to as the second region 125. The height difference between the first region 124 and the second region 125 is H. Because there is a height difference between the second region 125 and the first region 124, there is more free space above the second region 125. When the transmission mechanism is installed in the cleaning device, other structures can be assembled in the region with the height difference between the second region 125 and the first region 124, so that the internal space of the cleaning device is more effectively utilized, and the layout of the cleaning device is more compact.

[0074] As shown in FIG. 10, the output structure 300 is capable of rotating relative to the housing 100 and is capable of moving in the first direction relative to the housing 100. In one embodiment, the output structure 300 comprises a moving member 350 and a cooperating member 360, the moving member 350 is in transmission connection with the fifth gear structure 450, the moving member 350 is capable of rotating under the drive of the fifth gear structure 450, and the moving member 350 is capable of moving in the first direction relative to the fifth gear structure 450. Exemplarily, the transmission connection between the moving member 350 and the fifth gear structure 450 can be through a spline structure. The inner hole of the fifth gear structure 450 is a non-circular hole, and the outer contour surface of the area where the moving member 350 extends into the inner hole of the fifth gear structure 450 is non-circular. The cooperating member 360 is rotatably installed on the housing 100, the cooperating member 360 is in threaded connection with the moving member 350, and the length of the thread on the moving member 350 in the first direction is greater than the length of the thread on the cooperating member 360 in the first direction. Exemplarily, the moving member 350 is provided with external threads, and the cooperating member 360 is provided with internal threads. During the rotation of the moving member 350 under the drive of the fifth gear structure 450, the contact area between the external threads of the moving member 350 and the internal threads of the cooperating member 360 is relatively small, and thus the friction between the moving member 350 and the cooperating member 360 is relatively small, which is not enough to drive the cooperating member 360 to rotate. Therefore, the moving member 350 rotates relative to the cooperating member 360. Under the threaded connection, the moving member 350 moves in the first direction away from the housing 100 while rotating, and during the movement, the contact area between the external threads of the moving member 350 and the internal threads of the cooperating member 360 gradually increases. After moving to the cleaning position away from the housing 100, the contact area between the external threads of the moving member 350 and the internal threads of the cooperating member 360 is relatively large, and the friction between the moving member 350 and the cooperating member 360 is relatively large, which is enough to drive the cooperating member 360 to rotate. That is, the fifth gear structure 450 drives the cooperating member 360 and the moving member 350 to rotate together. The moving member 350 only rotates at this position, and the position in the first direction does not change, so as to facilitate the cleaning operation.

[0075] In some embodiments, the output structure 300 further comprises a retaining frame 320, which is connected with the housing 100. Exemplarily, the retaining frame 320 is connected with the second housing 130, and the retaining frame 320 surrounds the periphery of the moving member 350, plays a protective role for the moving member 350, and plays an axial and radial limiting role for the moving member 350.

[0076] In some embodiments, the output structure 300 further comprises an elastic member 330 installed between the holder 320 and the moving member 350, the elastic member 330 being used to provide a supporting reaction force for the moving member 350 when the moving member 350 is in the cleaning position away from the housing 100 and rotates, so that the moving member 350 can be more stably kept in the cleaning position. The elastic member 330 can be a spring, a spring sheet, a wavy elastic cylinder or the like. In a specific example, the elastic member 330 is a compression spring, which is sleeved on the periphery of the moving member 350, and the two ends of the compression spring are in contact with the moving member 350 and the holder 320 respectively. The compression spring is always in a compressed state between the moving member 350 and the holder 320. In some embodiments, the periphery of the moving member 350 is sleeved and connected with an assembly member 340, and the compression spring is in abutment with the assembly member 340. The assembly member 340 is provided to facilitate the abutment of the end of the compression spring with the moving member 350.

[0077] FIG. 11 is an exploded view of the transmission mechanism of the present disclosure. As shown in FIG. 11, in a specific embodiment of the present disclosure, the transmission mechanism comprises a housing 100, a driving structure 200, an output structure 300 and a transmission assembly 400. The housing 100 comprises a first shell 120 and a second shell 130, the first shell 120 is installed above the second shell 130 by the second self-tapping screw 140, the second shell 130 is installed with a vibration isolation structure 133, the vibration isolation structure 133 has an inner hole, and the vibration isolation structure 133 is used to pass through a screw to install the transmission mechanism to the mounting place of the cleaning device by the screw.

[0078] The transmission assembly 400 comprises a first gear structure 410, a second gear structure 420, a third gear structure 430, a fourth gear structure 440 and a fifth gear structure 450 which are sequentially engaged. The first gear structure 410 comprises a helical gear, which can be a bronze gear. The second gear structure 420, the third gear structure 430 and the fourth gear structure 440 can all be plastic double gear, which are rotatably installed in the housing 100 by a light shaft. The light shaft is a light surface cylindrical shaft structure. The light shaft is fixedly installed in the housing 100, which can be installed on the first shell 120 or the second shell 130. The second gear structure 420, the third gear structure 430 and the fourth gear structure 440 are rotatably assembled on the corresponding light shafts. The first gear structure 410 is connected with the output shaft of the driving structure 200, and the driving structure 200 is installed on the side (the bottom of the second shell 130) of the second shell 130 away from the first shell 120 by the machine screw 210.

[0079] The output structure 300 comprises a holder 320, a moving piece 350, a cooperating piece 360 and an elastic piece 330. The holder 320 is mounted on the bottom of the second housing 130 by a first self-tapping screw 310, the moving piece 350 and the cooperating piece 360 are mounted inside the holder 320, the moving piece 350 is threadedly connected with the cooperating piece 360, and the elastic piece 330 is connected between the moving piece 350 and the holder 320. The bottom of the second housing 130 is provided with a plurality of rollers 470, the rollers 470 are mounted on the second housing 130 by optical shafts, the optical shafts are fixedly mounted on the second housing 130, the rollers 470 are sleeved on the optical shafts and can rotate relative to the optical shafts. The axial direction of the rollers 470 is perpendicular to the first direction. The rollers 470 are respectively in contact with the cooperating piece 360 at one end in the first direction, so as to improve the stability of the cooperating piece 360 during rotation and reduce the inclination or shaking of the cooperating piece 360. Since the cooperating piece 360 rotates together with the moving piece 350 at the cleaning position, the arrangement of the rollers 470 can improve the stability of the moving piece 350 during rotation and reduce the inclination or shaking of the moving piece 350.

[0080] The transmission mechanism can further comprise a sensor 500 mounted on the shell 100. For example, the sensor 500 is attached to the second housing 130, and the sensor 500 can be an optical sensor 500. The sensor 500 is used to detect whether the moving piece 350 reaches the cleaning position in the first direction.

[0081] The moving piece 350 is in transmission connection with the fifth gear structure 450. The fifth gear structure 450 can be in rotation connection with the shell 100 through bearings. For example, the number of bearings is two, the two bearings are respectively a first bearing 461 and a second bearing 462, the fifth gear structure 450 is in rotation connection with the first housing 120 through the first bearing 461, and the fifth gear structure 450 is in rotation connection with the second housing 130 through the second bearing 462. In a specific example, the first bearing 461 and the second bearing 462 are both deep groove ball bearings. In a specific example, the outer ring of the first bearing 461 is tightly fitted with the first housing 120, the inner ring of the first bearing 461 is loosely fitted with the fifth gear structure 450, the outer ring of the second bearing 462 is tightly fitted with the second housing 130, and the inner ring of the second bearing 462 is loosely fitted with the fifth gear structure 450. The first bearing 461 and the second bearing 462 are used to support the rotation of the fifth gear structure 450, so as to improve the stability of the fifth gear structure 450 during rotation. Since the fifth gear structure 450 is in transmission connection with the output mechanism, the first bearing 461 and the second bearing 462 can improve the stability of the moving piece 350 in the output mechanism during rotation. In this embodiment, tightly fitted means relatively fixed connection, for example, interference fit assembly, and loosely fitted means relatively rotatable connection, for example, clearance fit assembly.

[0082] The embodiments of the present disclosure further provide a cleaning device, which comprises a cleaning element and the transmission mechanism provided by the above embodiments, and the cleaning element is installed on the output structure 300 of the transmission mechanism. The transmission mechanism is used to drive the cleaning element to move, so as to perform a cleaning operation by the cleaning element. The cleaning element can be a brush body, a mop or the like.

[0083] In an example, the cleaning device further comprises a mobile platform, which can be an autonomous mobile platform or a non-autonomous mobile platform. The autonomous mobile platform refers to that the mobile platform itself can automatically and adaptively make operation decisions according to unexpected environmental inputs. The non-autonomous mobile platform itself cannot adaptively make operation decisions according to unexpected environmental inputs, but can execute a predetermined program or run according to a certain logic. The transmission mechanism is installed in the mobile platform, and the cleaning element is located at the bottom of the mobile platform. Exemplarily, the transmission mechanism can drive the cleaning element to move in a first direction, so as to adjust the distance between the cleaning element and the surface on which the mobile platform is located, to control the contact or separation between the cleaning element and the surface on which the mobile platform is located. The transmission mechanism can also drive the cleaning element to rotate to perform a cleaning operation on the surface on which the mobile platform is located. When the mobile platform is placed on the ground, the surface on which the mobile platform is located is the ground. When the cleaning device is a window cleaning device, and the mobile platform is placed on the glass, the surface on which the mobile platform is located is the surface of the glass.

[0084] In some embodiments, the mobile platform is provided with a plurality of cleaning elements, and at least one cleaning element is installed on the output structure 300 of the transmission mechanism provided by the above embodiments.

[0085] In a specific embodiment, the mobile platform has opposite front and back sides, and opposite left and right sides. The moving direction of the mobile platform is the front side. One cleaning element is arranged on the left side of the mobile platform, and the cleaning element is a mop. The mop is connected with the output structure 300 of the transmission mechanism provided by the above embodiments.

[0086] In some embodiments, the mobile platform can have a circular shape. In other embodiments, the mobile platform can also have other shapes, including but not limited to an approximate D shape with a front circular shape.

[0087] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure, and they should be covered in the scope of the claims and the specification of the present disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A transmission mechanism for a cleaning device, comprising: The shell (100), the driving structure (200), the output structure (300) and the transmission assembly (400), the output structure (300) is used for connecting the cleaning element; The transmission assembly (400) comprises a plurality of gear structures, and the plurality of gear structures are sequentially meshed, wherein one of the gear structures is in transmission connection with the output structure (300), and another of the gear structures is in transmission connection with the driving structure (200), and the driving structure (200) drives the output structure (300) to move through the transmission assembly (400); The shell (100) has a containing cavity, and the plurality of gear structures are all installed in the containing cavity, and an oil blocking structure (110) is arranged in the containing cavity, and the oil blocking structure (110) is arranged around a part of the periphery of the gear structure.

2. The transmission mechanism of claim 1, wherein, The shell (100) comprises a first shell (120) and a second shell (130), the first shell (120) is installed on one side of the second shell (130) in a first direction, the first direction is parallel to the axial direction of the gear structure; the first shell (120) and the second shell (130) surround to form the containing cavity, and at least one of the first shell (120) and the second shell (130) is provided with the oil blocking structure (110).

3. The transmission mechanism of claim 2, wherein, The first shell (120) is provided with a first surrounding wall (121), and the second shell (130) is provided with a second surrounding wall (131), the first surrounding wall (121) and the second surrounding wall (131) are both closed annular structures, one of the first surrounding wall (121) and the second surrounding wall (131) is provided with an annular groove (132), and the other is provided with an annular convex portion (122), the annular convex portion (122) is located in the annular groove (132), and the first surrounding wall (121) and the second surrounding wall (131) surround to form the containing cavity. The first shell (120) is provided with a first surrounding wall (121), and the second shell (130) is provided with a second surrounding wall (131), the first surrounding wall (121) and the second surrounding wall (131) are both closed annular structures, one of the first surrounding wall (121) and the second surrounding wall (131) is provided with an annular groove (132), and the other is provided with an annular convex portion (122), the annular convex portion (122) is located in the annular groove (132), and the first surrounding wall (121) and the second surrounding wall (131) surround to form the containing cavity.

4. The transmission mechanism of claim 2 or 3, wherein, The plurality of gear structures comprises a first gear structure (410), a second gear structure (420), a third gear structure (430), a fourth gear structure (440) and a fifth gear structure (450), the first gear structure (410) is in driving connection with the driving structure (200), the fifth gear structure (450) is in driving connection with the output structure (300), the second gear structure (420) comprises a second upper gear part (421) and a second lower gear part (422) coaxially connected in the first direction, the third gear structure (430) comprises a third upper gear part (431) and a third lower gear part (432) coaxially connected in the first direction, the fourth gear structure (440) comprises a fourth upper gear part (441) and a fourth lower gear part (442) coaxially connected in the first direction, the first gear structure (410) is in mesh with the second lower gear part (422), the second upper gear part (421) is in mesh with the third upper gear part (431), the third lower gear part (432) is in mesh with the fourth lower gear part (442), and the fourth upper gear part (441) is in mesh with the fifth gear structure (450).

5. The transmission mechanism of claim 4, wherein, The first gap (433) is between the third upper gear and the third lower gear, and part of the second lower gear part and part of the fourth upper gear part are located in the first gap (433).

6. The transmission mechanism of claim 5, wherein, The first housing (120) has a first area (124) and a second area (125), the first area (124) is opposite to the first gear structure (410), the second gear structure (420) and the third gear structure (430), the second area (125) is opposite to the fourth gear structure (440) and the fifth gear structure (450), and there is a height difference between the wall surface away from the accommodating cavity of the first area (124) and the wall surface away from the accommodating cavity of the second area (125).

7. The transmission mechanism of any one of claims 4 to 6, wherein, The first gear structure (410) and the second lower gear part each comprise a helical gear.

8. A transmission mechanism as claimed in any one of claims 2 to 7, wherein, The first housing (120) and the second housing (130) are respectively provided with a reinforcing rib (123) connected with the oil blocking structure.

9. The transmission mechanism of any one of claims 1 to 7, wherein, The driving structure (200) comprises a brushless motor. 10.A cleaning device comprising a cleaning element and a transmission mechanism according to any one of claims 1 to 9, the cleaning element being mounted on the output structure (300) of the transmission mechanism.

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