Compact transmission mechanism and cleaning device

Abstract

This application provides a compact transmission mechanism, including a housing assembly, a transmission assembly, and a clutch assembly. The transmission assembly includes a main shaft, a transmission shaft, an output component, a first bevel gear, and a second bevel gear. The first and second bevel gears are rotatably sleeved on the main shaft, with the teeth of the first and second bevel gears facing each other. One end of the transmission shaft meshes with the first and second bevel gears respectively. The clutch assembly includes a clutch drive and a clutch element. The clutch element is movably sleeved on the main shaft along the lifting direction and engages with either the first or second bevel gear. This application, through the setting of the clutch element and utilizing the difference in meshing position caused by the relative arrangement of the teeth of the two bevel gears, synchronously switches the clutch element when the main shaft changes direction, offsetting the influence of the direction change, ensuring that the output component rotates in a consistent direction, eliminating the need for two independent transmission paths, and resulting in a compact structure.

Description

Technical Field

[0001] This invention relates to the field of cleaning equipment technology, and more specifically, to a compact transmission mechanism and cleaning device. Background Technology

[0002] With the development of the social economy and the improvement of family living standards, home cleaning equipment is gradually entering an era of intelligence and mechanization. Cleaning robots, represented by robotic vacuum cleaners, can effectively reduce people's workload in home cleaning, freeing them from heavy housework and improving their quality of life.

[0003] Robotic vacuum cleaners often extend their cleaning discs to expand the cleaning area during cleaning. To achieve both the extension / retraction of the cleaning disc and its rotational cleaning motion, two motors are typically needed to drive these two actions independently, resulting in a complex structure and high cost. Currently, a single motor can drive both actions simultaneously. However, to ensure cleaning effectiveness, the cleaning disc's rotation direction must remain consistent regardless of whether it's in the extended or retracted position; otherwise, accumulated dust may be thrown outwards, reducing cleaning efficiency. For example, CN117958668A discloses a side brush module and cleaning device that uses two independent rotary transmission components. The side brush module can selectively engage with either the first or second rotary transmission component via the axial movement of helical gears, ensuring that the cleaning disc's cleaning direction remains unchanged even when the motor output direction changes. However, this solution requires two complete transmission chains, resulting in numerous gears and long transmission paths, leading to a large space occupied by the entire side brush module. This is unfavorable for layout and integration into the compact internal space of a robotic vacuum cleaner. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides a compact transmission mechanism and a cleaning device.

[0005] This application discloses a compact transmission mechanism comprising: a housing assembly, a transmission assembly, and a clutch assembly; the transmission assembly includes a main shaft, a transmission shaft, an output assembly, a first bevel gear, and a second bevel gear. The main shaft is rotatably mounted on the housing assembly, and the first and second bevel gears are rotatably mounted on the outside of the main shaft, with the teeth of the first and second bevel gears facing each other. One end of the transmission shaft meshes with the first and second bevel gears, and the other end of the transmission shaft is connected to the output assembly, which is rotatably mounted on the housing assembly; the clutch assembly includes a clutch drive and a clutch member. The clutch member is movably mounted on the outside of the main shaft in the lifting direction and can rotate synchronously with the main shaft. The clutch drive is configured to drive the clutch member to lift and lower, so that the clutch member engages with the first or second bevel gear.

[0006] Preferably, the clutch component includes a clutch lifting part and a clutch rotating part. The clutch rotating part is movably sleeved outside the main shaft component along the lifting direction, so that the main shaft component can be connected to the first bevel gear component or the second bevel gear component through the clutch rotating part. The clutch rotating part is configured to rotate synchronously with the main shaft component. One end of the clutch lifting part is rotatably sleeved outside the clutch rotating part. The clutch drive component is configured to drive the clutch lifting part to lift.

[0007] Preferably, the clutch assembly further includes a first damping element, and the clutch drive component includes a clutch drive part, a first mating sleeve and a second mating sleeve. The first mating sleeve is rotatably sleeved outside the main shaft component, and the second mating sleeve is screwed onto the outside of the first mating sleeve. The first damping element is disposed on the housing assembly and sleeved outside the second mating sleeve. The clutch drive part is configured to drive the first mating sleeve to rotate, and the other end of the clutch lifting part is connected to the second mating sleeve.

[0008] Preferably, the outer surface of the clutch rotating part is provided with a rotating groove, and one end of the clutch lifting part is embedded in the rotating groove, so that the clutch rotating part and the clutch lifting part move up and down synchronously in the lifting direction, and the clutch rotating part can rotate relative to the clutch lifting part.

[0009] Preferably, a flat portion is provided on the outer surface of the spindle component, and the clutch rotating part rotates synchronously with the spindle component through the flat portion.

[0010] Preferably, the housing assembly includes an outer housing component and a swing housing component. One end of the swing housing component is rotatably disposed on the outer housing component, and the other end of the swing housing component can swing relative to the outer housing component. The main shaft component passes through one end of the swing housing component and is rotatably disposed on the outer housing component, and the output component passes through the other end of the swing housing component.

[0011] Preferably, the transmission shaft component includes a transmission shaft, a third bevel tooth, and a fourth bevel tooth. The third bevel tooth and the fourth bevel tooth are respectively located at both ends of the transmission shaft. The third bevel tooth meshes with the first bevel tooth component and the second bevel tooth component, respectively, and the fourth bevel tooth meshes with the output component.

[0012] Preferably, the output component includes an output shaft and a fifth bevel tooth, the fifth bevel tooth being located at one end of the output shaft and meshing with the fourth bevel tooth.

[0013] Preferably, the output component further includes a third mating sleeve, a fourth mating sleeve, and a second damping sleeve. The third mating sleeve is sleeved outside the output shaft, the fourth mating sleeve is screwed onto the third mating sleeve, and the second damping sleeve is sleeved on the housing assembly and sleeved outside the fourth mating sleeve.

[0014] This application discloses a cleaning device, including a compact transmission mechanism.

[0015] The beneficial effects of this application are as follows: Because the teeth of the first and second bevel gears are arranged opposite each other and both mesh with the same end of the transmission shaft, the different meshing positions of the first and second bevel gears allow the clutch, which moves axially along the main shaft, to selectively engage with either the first or second bevel gear. When the drive direction of the main motor changes due to a change in the working mode, only the bevel gear engaged by the clutch needs to be switched synchronously to offset the influence of the main shaft's rotation on the output direction of the transmission shaft. This ensures that the cleaning rotation direction of the output and cleaning components remains consistent regardless of whether the main shaft rotates forward or backward, effectively improving the cleaning effect. Simultaneously, the subsequent transmission chain formed by the transmission shaft and output components is shared by the first and second bevel gears, eliminating the need for two independent transmission paths. This significantly reduces the number of transmission parts, resulting in a more compact overall structure, which is beneficial for integrated placement in space-constrained cleaning devices such as robotic vacuum cleaners. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the compact transmission mechanism in the embodiment; Figure 2 This is a schematic diagram of the compact transmission mechanism after the outer casing has been disassembled in the embodiment. Figure 3 This is a schematic diagram of the transmission assembly and clutch assembly in the embodiment; Figure 4 This is an exploded view of the output component in the embodiment; Figure 5 This is a cross-sectional view of the output component in the embodiment; Figure 6 This is a schematic diagram of the structure of the first mating sleeve in the embodiment; Figure 7 This is a schematic diagram of the structure of the second mating sleeve in the embodiment; Figure 8 This is a schematic diagram of the clutch lifting mechanism in the embodiment; Figure 9 This is a schematic diagram of the clutch rotating part in the embodiment; Figure 10 This is a schematic diagram of the structure of the first bevel gear in the embodiment.

[0017] Figure label: 1. Housing assembly; 11. Outer shell component; 12. Swinging housing component; 2. Transmission assembly; 21. Main shaft component; 22. Transmission shaft component; 221. Transmission shaft; 222. Third bevel gear; 223. Fourth bevel gear; 23. Output component; 231. Output shaft; 232. Fifth bevel gear; 233. Third mating sleeve; 234. Fourth mating sleeve; 235. Second damping sleeve; 24. First bevel gear component; 241. Engaging groove; 25. Second bevel gear component; 3. Clutch assembly; 31. Clutch drive component; 311. Clutch drive part; 312. First mating sleeve; 313. Second mating sleeve; 32. Clutch component; 321. Clutch lifting part; 322. Clutch rotating part; 3221. Rotating groove; 3222. Engaging protrusion; 33. First damping component. Detailed Implementation

[0018] The following drawings disclose several embodiments of this application. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this application. That is, in some embodiments of this application, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0019] It should be noted that all directional indications in the embodiments of this application, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0020] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit this application. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0021] To further understand the content, features, and effects of this application, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0022] Example 1: Reference Figures 1-3 , Figure 1This is a schematic diagram of the compact transmission mechanism in the embodiment. Figure 2 This is a schematic diagram of the compact transmission mechanism after the outer casing has been disassembled in the embodiment. Figure 3 The diagram illustrates the structure of the transmission and clutch components in this embodiment. The compact transmission mechanism in this embodiment includes a housing assembly 1, a transmission assembly 2, and a clutch assembly 3. The transmission assembly 2 includes a main shaft 21, a transmission shaft 22, an output component 23, a first bevel gear 24, and a second bevel gear 25. The main shaft 21 is rotatably mounted on the housing assembly 1. The first bevel gear 24 and the second bevel gear 25 are rotatably sleeved on the outside of the main shaft 21, with the teeth of the first bevel gear 24 and the teeth of the second bevel gear 25 facing each other. One end of the transmission shaft 22 meshes with the first bevel gear 24 and the second bevel gear 25, and the other end of the transmission shaft 22 is connected to the output component 23. The output component 23 is rotatably mounted on the housing assembly 1. The clutch assembly 3 includes a clutch drive 31 and a clutch 32. The clutch 32 is movably sleeved on the outside of the main shaft 21 in the lifting direction, and the clutch 32 can rotate synchronously with the main shaft 21. The clutch drive 31 is configured to drive the clutch 32 to lift, so that the clutch 32 engages with the first bevel gear 24 or the second bevel gear 25.

[0023] The compact transmission mechanism in this embodiment is applied to cleaning devices such as sweeping robots. The end of the output component 23 furthest from the transmission shaft component 22 is connected to a cleaning component. The main shaft component 21 is driven to rotate by the main motor of the cleaning device. The clutch component 32 can move up and down in the lifting direction, selectively engaging with either the first bevel gear component 24 or the second bevel gear component 25. The lifting direction is the axial direction of the main shaft component 21. When the clutch component 32 engages with the second bevel gear component 25, the rotational power of the main shaft component 21 is transmitted to the second bevel gear component 25 via the clutch component 32. The second bevel gear component 25 drives the transmission shaft component 22 to rotate, and the transmission shaft component 22 transmits the power to the output component 23, which then drives the cleaning component to rotate. When the clutch component 32 moves axially along the main shaft component 21, disengaging from the second bevel gear component 25 and engaging with the first bevel gear component 24, the rotational power of the main shaft component 21 is transmitted to the first bevel gear component 24 via the clutch component 32. The first bevel gear component 24 drives the transmission shaft component 22 to rotate, which in turn drives the output component 23 and the cleaning component to rotate. Since the teeth of the first bevel gear 24 and the second bevel gear 25 are arranged opposite each other and both mesh with the same end of the transmission shaft 22, when the main shaft 21 rotates in the forward direction, the direction of transmission from the main shaft 21 to the transmission shaft 22 via the first bevel gear 24 is forward, while the direction of transmission via the second bevel gear 25 is reverse. Conversely, when the main shaft 21 rotates in the reverse direction, the direction of transmission from the main shaft 21 to the transmission shaft 22 via the first bevel gear 24 is reverse, while the direction of transmission via the second bevel gear 25 is forward. Thus, when the working mode of the cleaning device changes, causing a change in the drive direction of the main motor, the clutch 32 only needs to synchronously switch the engaged bevel gear to offset the effect of the main shaft 21's rotational direction on the output direction of the transmission shaft 22. This ensures that regardless of whether the main shaft 21 rotates in the forward or reverse direction, the transmission shaft 22 and the output shaft 23 maintain the same rotation direction, ensuring that the cleaning rotation direction of the cleaning component remains consistent, thus improving the cleaning effect. Simultaneously, the subsequent transmission chain formed by the transmission shaft 22 and the output shaft 23 is shared by the first bevel gear 24 and the second bevel gear 25. Regardless of which bevel gear the clutch 32 engages with, power is output through the same transmission shaft 22 and the output shaft 23, eliminating the need for two independent transmission paths, reducing the number of transmission parts, and making the overall structure more compact. Specifically, the main shaft 21 is the drive shaft.

[0024] Rereference Figure 2Preferably, the transmission shaft component 22 includes a transmission shaft 221, a third bevel gear 222, and a fourth bevel gear 223. The third bevel gear 222 and the fourth bevel gear 223 are respectively disposed at both ends of the transmission shaft 221. The third bevel gear 222 meshes with the first bevel gear component 24 and the second bevel gear component 25, respectively, and the fourth bevel gear 223 meshes with the output component 23. In specific applications, the transmission shaft 221 is rotatably disposed within the housing assembly 1, the third bevel gear 222 is fixed to one end of the transmission shaft 221 near the main shaft component 21, and the fourth bevel gear 223 is fixed to one end of the transmission shaft 221 near the output component 23. The third bevel gear 222 simultaneously maintains a meshing state with the first bevel gear component 24 and the second bevel gear component 25. When the clutch 32 engages with the second bevel gear 25, the power of the main shaft 21 is transmitted to the third bevel gear 222 via the second bevel gear 25. The third bevel gear 222 drives the transmission shaft 221 to rotate, and the transmission shaft 221 transmits the power to the output component 23 via the fourth bevel gear 223. When the clutch 32 switches to engage with the first bevel gear 24, the power of the main shaft 21 is transmitted to the third bevel gear 222 via the first bevel gear 24. The third bevel gear 222 drives the transmission shaft 221 and the fourth bevel gear 223 to rotate, thereby driving the output component 23 to rotate. Since the teeth of the first bevel gear 24 and the teeth of the second bevel gear 25 are arranged opposite to each other, they mesh with the third bevel gear 222 from both axial sides. When the rotation direction of the main shaft 21 remains unchanged, the rotation direction of the first bevel gear 24 driving the third bevel gear 222 is opposite to the rotation direction of the second bevel gear 25 driving the third bevel gear 222. That is, the third bevel tooth 222, the drive shaft 221 and the fourth bevel tooth 223 share a transmission path. Regardless of whether the power comes from the first bevel tooth 24 or the second bevel tooth 25, it is transmitted to the output part 23 through the same drive shaft 221. The transmission structure is simple, the number of parts is small and the space occupied is small.

[0025] Reference Figure 4 and Figure 5 , Figure 4 This is an exploded view of the output component in the embodiment. Figure 5The diagram shows a cross-sectional view of the output component in the embodiment. Preferably, the output component 23 includes an output shaft 231 and a fifth bevel tooth 232. The fifth bevel tooth 232 is located at one end of the output shaft 231 and meshes with a fourth bevel tooth 223. In specific applications, the output shaft 231 is rotatably mounted within the housing assembly 1. The fifth bevel tooth 232 is fixed to the end of the output shaft 231 near the transmission shaft component 22 and remains meshed with the fourth bevel tooth 223. When the power of the main shaft component 21 is transmitted to the fourth bevel tooth 223 via the clutch component 32 and the transmission shaft component 22, the fourth bevel tooth 223 drives the fifth bevel tooth 232 to rotate. The fifth bevel tooth 232 drives the output shaft 231 to rotate synchronously. The end of the output shaft 231 away from the fifth bevel tooth 232 is connected to a cleaning component, thereby driving the cleaning component to rotate and perform a cleaning action. The meshing of the fifth bevel tooth 232 and the fourth bevel tooth 223 changes the power transmission direction from the axial direction of the drive shaft 221 to the axial direction of the output shaft 231, making the rotation axis of the cleaning component perpendicular to the axis of the drive shaft 221, thus adapting to the installation direction requirements of the cleaning component in the cleaning device. Simultaneously, the output shaft 231 and the fifth bevel tooth 232, as the end output components of the subsequent transmission chain, together with the drive shaft component 22, form a complete transmission path, resulting in a simple and compact structure.

[0026] Rereference Figure 2 Preferably, the housing assembly 1 includes an outer shell 11 and a swinging housing 12. One end of the swinging housing 12 is rotatably mounted on the outer shell 11, and the other end of the swinging housing 12 can swing relative to the outer shell 11. A main shaft 21 passes through one end of the swinging housing 12 and is rotatably mounted on the outer shell 11. An output component 23 passes through the other end of the swinging housing 12. In specific applications, the outer shell 11 is fixed to the bottom of the cleaning device body. One end of the swinging housing 12 is rotatably connected to the outer shell 11, and the other end of the swinging housing 12 is a free end, which can swing outward or retract inward relative to the outer shell 11 around the rotatable connection. The main shaft 21 is rotatably connected to the outer shell 11 and passes through one end of the swinging housing 12, such that the swing axis of the swinging housing 12 coincides with the axis of the main shaft 21. The output component 23 is rotatably connected to the other end of the swinging housing 12. When the swing housing 12 swings relative to the outer casing 11, the output component 23 and the cleaning component move synchronously with the swing housing 12, thereby switching the cleaning component between an inward position retracted below the outer casing 11 and an outward swing position extending outside the outer casing 11. In the outward swing position, the cleaning component extends beyond the edge of the machine body, effectively cleaning areas such as walls and corners, expanding the cleaning coverage area. The swinging motion of the swing housing 12 and the rotational motion of the cleaning component are powered by the same main shaft 21, eliminating the need for a separate swing drive mechanism, resulting in a compact structure and high integration. Specifically, the outer casing 11 is the cleaning casing, and the swing housing 12 is the swing housing.

[0027] Rereference Figure 4 and Figure 5Preferably, the output component 23 further includes a third mating sleeve 233, a fourth mating sleeve 234, and a second damping sleeve 235. The third mating sleeve 233 is sleeved outside the output shaft 231, and the fourth mating sleeve 234 is screwed onto the third mating sleeve 233. The second damping sleeve 235 is located on the housing assembly 1 and sleeved outside the fourth mating sleeve 234. In specific applications, the third mating sleeve 233 is fixedly sleeved on the other end of the output shaft 231 and rotates synchronously with the output shaft 231. The outer wall of the third mating sleeve 233 has an external thread, and the inner wall of the fourth mating sleeve 234 has an internal thread. The fourth mating sleeve 234 is sleeved outside the third mating sleeve 233 through the internal and external thread engagement. The second damping sleeve 235 is fixed inside the swing housing component 12 and tightly sleeved on the outer wall of the fourth mating sleeve 234, applying rotational resistance to the fourth mating sleeve 234. This rotational resistance prevents the fourth mating sleeve 234 from easily rotating synchronously with the third mating sleeve 233. The cleaning component is fixedly connected to the third mating sleeve 233 and its height position can be changed as the third mating sleeve 233 is raised or lowered. The threaded engagement between the third mating sleeve 233 and the fourth mating sleeve 234 has a self-locking characteristic, that is, the two will not rotate relative to each other due to axial force unless subjected to a sufficiently large rotational driving force. When the main shaft 21 starts to rotate, the power is transmitted to the output shaft 231 through the clutch 32, the transmission shaft 22 and the fifth bevel gear 232, and the output shaft 231 drives the third mating sleeve 233 to rotate. At the moment of startup, due to the rotational resistance exerted by the second damping sleeve 235 on the fourth mating sleeve 234, and the self-locking effect of the threaded engagement between the third mating sleeve 233 and the fourth mating sleeve 234, the fourth mating sleeve 234 is difficult to rotate relative to the third mating sleeve 233. At this instant, the output shaft 231, the third mating sleeve 233, and the fourth mating sleeve 234 form a whole, and the end of the transmission chain is in a locked state. Since the end of the transmission chain is locked, the rotational motion cannot continue to be transmitted downwards. The entire transmission chain from the main shaft 21 to the output component 23 is equivalent to forming a temporary rigid link. At this time, the power output by the main shaft 21 no longer drives the output shaft 231 to rotate, but instead drives the entire swing housing 12 to swing around the rotational connection between it and the outer housing 11 through this rigid link of the transmission chain. That is, when the main shaft 21 rotates in the forward direction, the swing housing 12 swings outwards, and when the main shaft 21 rotates in the reverse direction, it drives the swing housing 12 to retract inwards. When the swing housing 12 swings to its limit position, the outer housing 11 blocks the swing housing 12, preventing it from swinging further. At this time, the main shaft 21 continues to output power, which is converted into a torsional force acting between the third mating sleeve 233 and the fourth mating sleeve 234. When this torsional force overcomes the self-locking force of the threaded fit, relative rotation occurs between the third mating sleeve 233 and the fourth mating sleeve 234.Because the fourth mating sleeve 234 is restricted from rotation by the second damping sleeve 235, the third mating sleeve 233 drives the fourth mating sleeve 234 to move up and down axially along the output shaft 231 during rotation via threaded engagement, thereby causing the cleaning component to descend to the working surface or rise away from the working surface. When the fourth mating sleeve 234 reaches its limit position, the third mating sleeve 233 continues to rotate, causing the fourth mating sleeve 234 to overcome the rotational resistance of the second damping sleeve 235 and rotate synchronously, thus causing the cleaning component to rotate and perform the cleaning action. In this way, without the need for an additional drive source and control device, the sequential switching of the three actions of the swinging housing 12, the lifting and lowering of the cleaning component, and the rotation of the cleaning component is realized. The structure is simple and compact, and the operation is reliable.

[0028] Refer to together Figures 6-10 , Figure 6 This is a schematic diagram of the structure of the first mating sleeve in the embodiment. Figure 7 This is a schematic diagram of the structure of the second mating sleeve in the embodiment. Figure 8 This is a schematic diagram of the clutch lifting mechanism in the embodiment. Figure 9 This is a schematic diagram of the clutch rotating part in the embodiment. Figure 10The diagram illustrates the structure of the first bevel gear in the embodiment. Preferably, the clutch component 32 includes a clutch lifting part 321 and a clutch rotating part 322. The clutch rotating part 322 is movably sleeved on the outside of the main shaft component 21 along the lifting direction, so that the main shaft component 21 can be connected to the first bevel gear component 24 or the second bevel gear component 25 through the clutch rotating part 322. The clutch rotating part 322 is configured to rotate synchronously with the main shaft component 21. One end of the clutch lifting part 321 is rotatably sleeved on the outside of the clutch rotating part 322. The clutch drive component 31 is configured to drive the clutch lifting part 321 to lift and lower. In specific applications, a flat portion is provided on the outer surface of the main shaft component 21, and the clutch rotating part 322 achieves synchronous rotation with the main shaft component 21 through the flat portion. That is, the inner hole of the clutch rotating part 322 is provided with a flat hole that matches the flat part on the main shaft 21, so that when the clutch rotating part 322 is sleeved on the main shaft 21, it can slide freely along the axial direction of the main shaft 21 and rotate synchronously with the main shaft 21. Specifically, the clutch rotating part 322 is a clutch engagement block, the first bevel gear 24 and the second bevel gear 25 are both bevel gears, and the clutch lifting part 321 is a lifting connecting bar. The clutch rotating part 322 is movably disposed between the first bevel gear 24 and the second bevel gear 25. The upper end face and the lower end face of the clutch rotating part 322 are provided with engagement protrusions 3222, and the lower end face of the first bevel gear 24 and the upper end face of the second bevel gear 25 are respectively provided with engagement grooves 241. When the clutch drive 31 drives the clutch lifting part 321 to descend, the clutch lifting part 321 drives the clutch rotating part 322 to move downward along the axis of the main shaft 21. The engagement protrusion 3222 on the lower end face of the clutch rotating part 322 extends into the engagement groove 241 of the second bevel gear 25, so that the clutch rotating part 322 engages with the second bevel gear 25, and the rotational power of the main shaft 21 is transmitted to the second bevel gear 25 through the clutch rotating part 322. When the clutch drive member 31 drives the clutch lifting part 321 to rise, the clutch lifting part 321 drives the clutch rotating part 322 to move upward along the axis of the main shaft member 21. The engaging protrusion 3222 on the lower end face of the clutch rotating part 322 disengages from the engaging groove 241 of the second bevel gear member 25, and the engaging protrusion 3222 on the upper end face extends into the engaging groove 241 of the first bevel gear member 24, so that the clutch rotating part 322 engages with the first bevel gear member 24. The rotational power of the main shaft member 21 is transmitted to the first bevel gear member 24 through the clutch rotating part 322. Through the engagement of the engaging protrusion 3222 and the engaging groove 241, reliable torque transmission is achieved between the clutch rotating part 322 and the first bevel gear member 24 or the second bevel gear member 25. The structure is simple and the engagement is stable.

[0029] Preferably, the clutch assembly 3 further includes a first damping element 33, and the clutch drive element 31 includes a clutch drive part 311, a first mating sleeve 312, and a second mating sleeve 313. The first mating sleeve 312 is rotatably sleeved on the outside of the main shaft 21, and the second mating sleeve 313 is screwed onto the outside of the first mating sleeve 312. The first damping element 33 is disposed on the housing assembly 1 and sleeved on the outside of the second mating sleeve 313. The clutch drive part 311 is configured to drive the first mating sleeve 312 to rotate, and the other end of the clutch lifting part 321 is connected to the second mating sleeve 313. In specific applications, the first mating sleeve 312 is rotatably sleeved on the outside of the main shaft 21 and can rotate freely relative to the main shaft 21. The outer wall of the first mating sleeve 312 is provided with an external thread, and the inner wall of the second mating sleeve 313 is provided with an internal thread. The second mating sleeve 313 is sleeved on the outside of the first mating sleeve 312 through the internal and external thread engagement. The first damping element 33 is fixed to the housing assembly 1 and tightly fitted around the second mating sleeve 313, applying rotational resistance to the second mating sleeve 313. The clutch drive unit 311 is a motor, which is connected to the first mating sleeve 312 via gear transmission, and is used to drive the first mating sleeve 312 to rotate. The second mating sleeve 313 is connected to the clutch lifting unit 321, so that when the second mating sleeve 313 rises and falls, it drives the clutch lifting unit 321 to rise and fall synchronously. When it is necessary to switch the engagement object of the clutch rotating unit 322, the clutch drive unit 311 is activated, driving the first mating sleeve 312 to rotate. Because the first damping element 33 applies rotational resistance to the second mating sleeve 313, the second mating sleeve 313 cannot rotate synchronously with the first mating sleeve 312, and a speed difference is generated between the first mating sleeve 312 and the second mating sleeve 313. Under the action of this speed difference, through the internal and external thread engagement, the second mating sleeve 313 moves up and down along the axial direction of the main shaft 21. When the clutch drive unit 311 drives the first mating sleeve 312 to rotate in the first direction, the second mating sleeve 313 rises axially, causing the clutch lifting part 321 and the clutch rotating part 322 to rise synchronously, so that the clutch rotating part 322 disengages from the second bevel gear 25 and engages with the first bevel gear 24; when the clutch drive unit 311 drives the first mating sleeve 312 to rotate in the second direction, the second mating sleeve 313 descends axially, causing the clutch lifting part 321 and the clutch rotating part 322 to descend synchronously, so that the clutch rotating part 322 disengages from the first bevel gear 24 and engages with the second bevel gear 25. In this embodiment, the first direction and the second direction are opposite. In this way, through the cooperation of the first mating sleeve 312, the second mating sleeve 313 and the first damping member 33, the rotational motion of the clutch drive unit 311 is converted into the lifting motion of the clutch lifting part 321 and the clutch rotating part 322, resulting in a simple and compact structure and reliable transmission. Specifically, the first damping member 33 is a damping sleeve.

[0030] Preferably, the outer surface of the clutch rotating part 322 is provided with a rotating groove 3221, and one end of the clutch lifting part 321 is embedded in the rotating groove 3221, so that the clutch rotating part 322 and the clutch lifting part 321 move up and down synchronously in the lifting direction, and the clutch rotating part 322 can rotate relative to the clutch lifting part 321. In specific applications, the outer surface of the clutch rotating part 322 is provided with a rotating groove 3221, which is an annular groove extending circumferentially along the clutch rotating part 322. One end of the clutch lifting part 321 is provided with a U-shaped opening, which is engaged in the rotating groove 3221, so that the clutch lifting part 321 and the clutch rotating part 322 form a limiting fit in the lifting direction. That is, when the clutch lifting part 321 moves up and down axially along the main shaft 21, the upper and lower groove walls of the rotating groove 3221 push and pull the clutch rotating part 322, driving the clutch rotating part 322 to move up and down synchronously. Meanwhile, a circumferential gap is left between the U-shaped opening of the clutch lifting part 321 and the rotating groove 3221, allowing them to slide relative to each other. When the clutch rotating part 322 rotates with the main shaft 21, the groove surface of the rotating groove 3221 slides relative to the U-shaped opening of the clutch lifting part 321, preventing the rotational motion of the clutch rotating part 322 from being transmitted to the clutch lifting part 321, thus keeping the clutch lifting part 321 stationary. In this way, by setting the rotating groove 3221, axial synchronous linkage between the clutch rotating part 322 and the clutch lifting part 321 is achieved, while circumferential motion decoupling is also realized, preventing interference between the clutch lifting part 321 and its connected drive components and surrounding components caused by the high-speed rotation of the clutch rotating part 322. Specifically, the outer surface of the second mating sleeve 313 is also provided with a rotating groove, and the other end of the clutch lifting part 321 is provided with a U-shaped opening. The U-shaped opening is inserted into the rotating groove, so that the clutch lifting part 321 and the second mating sleeve 313 form a limiting fit in the lifting direction, so that when the second mating sleeve 313 lifts and lowers, it drives the clutch lifting part 321 to lift and lower synchronously.

[0031] The compact transmission mechanism in this embodiment has two operating states: extended state and retracted state. In the extended state, the clutch 32 engages with the first bevel gear 24. At this time, the main shaft 21 is driven by the main motor to rotate in the forward direction, and the main shaft 21 drives the clutch rotating part 322 to rotate synchronously in the forward direction through the flat position. Since the engagement protrusion 3222 on the upper end face of the clutch rotating part 322 extends into the engagement groove 241 of the first bevel gear 24, the clutch rotating part 322 transmits the forward rotational power to the first bevel gear 24, and the first bevel gear 24 rotates in the forward direction, driving the third bevel gear 222 to rotate in the reverse direction. The third bevel gear 222 drives the fourth bevel gear 223 to rotate synchronously in the reverse direction through the transmission shaft 221, the fourth bevel gear 223 drives the fifth bevel gear 232 to rotate in the forward direction, and the fifth bevel gear 232 drives the output shaft 231 to rotate in the forward direction. At the instant the output shaft 231 starts rotating, due to the rotational resistance exerted by the second damping sleeve 235 on the fourth mating sleeve 234, and the self-locking effect of the threaded fit between the third mating sleeve 233 and the fourth mating sleeve 234, the fourth mating sleeve 234 is difficult to rotate relative to the third mating sleeve 233. At this instant, the output shaft 231, the third mating sleeve 233, and the fourth mating sleeve 234 form a whole, and the end of the transmission chain is in a locked state. Since the end of the transmission chain is locked, the rotational motion cannot continue to be transmitted downwards. The entire transmission chain from the main shaft 21 to the output component 23 is equivalent to forming a temporary rigid link. At this time, the positive rotational power output by the main shaft 21 no longer drives the output shaft 231 to rotate, but instead drives the entire swing housing 12 to swing outwards around its rotational connection with the outer casing 11 through this rigid link of the transmission chain, causing the cleaning component to move from the inward position to the outward swing position. When the swing housing 12 swings to the outward swing limit position, the outer casing 11 blocks the swing housing 12, and the swing housing 12 can no longer swing. At this time, the main spindle 21 continues to output forward rotational power, which is converted into a torsional force acting between the third mating sleeve 233 and the fourth mating sleeve 234. When this torsional force overcomes the self-locking force of the threaded fit, relative rotation occurs between the third mating sleeve 233 and the fourth mating sleeve 234. Since the fourth mating sleeve 234 is restricted from rotation by the second damping sleeve 235, the third mating sleeve 233 drives itself to descend axially along the output shaft 231 through the threaded fit during forward rotation, thereby driving the cleaning component to descend to the working surface. When the third mating sleeve 233 descends to its limit position, the third mating sleeve 233 continues to rotate forward, which will drive the fourth mating sleeve 234 to overcome the rotational resistance of the second damping sleeve 235 and rotate synchronously forward, so that the cleaning component performs the cleaning action in forward rotation in the outward swing position.

[0032] In the retracted state, the clutch 32 engages with the second bevel gear 25. At this time, the clutch drive unit 311 starts first, driving the first mating sleeve 312 to rotate in the second direction. Due to the rotational resistance applied by the first damping member 33 to the second mating sleeve 313, the second mating sleeve 313 cannot rotate synchronously with the first mating sleeve 312, resulting in a speed difference between the first mating sleeve 312 and the second mating sleeve 313. Under the action of this speed difference, the second mating sleeve 313 descends axially, driving the clutch lifting part 321 and the clutch rotating part 322 to descend synchronously. This causes the engagement protrusion 3222 on the upper end face of the clutch rotating part 322 to disengage from the engagement groove 241 of the first bevel gear 24, and the engagement protrusion 3222 on the lower end face to extend into the engagement groove 241 of the second bevel gear 25, completing the clutch switching. Afterward, the main shaft 21 is driven by the main motor to rotate in the opposite direction, and the main shaft 21 drives the clutch rotating part 322 to rotate synchronously in the opposite direction through the flat position. Because the clutch rotating part 322 engages with the second bevel gear 25, the clutch rotating part 322 transmits the reverse rotational power to the second bevel gear 25. The second bevel gear 25 rotates in the reverse direction and drives the third bevel gear 222, which meshes with it, to rotate in the forward direction. The third bevel gear 222 drives the fourth bevel gear 223 to rotate synchronously in the forward direction through the transmission shaft 221. The fourth bevel gear 223 drives the fifth bevel gear 232, which meshes with it, to rotate in the reverse direction. The fifth bevel gear 232 drives the output shaft 231 to rotate in the reverse direction. At the moment the output shaft 231 starts, due to the rotational resistance of the second damping sleeve 235 and the self-locking effect of the threaded engagement, the end of the transmission chain locks, and the entire transmission chain forms a rigid link. At this time, the reverse rotational power output by the main shaft 21 continues to drive the entire swing housing 12 to retract inward around its rotational connection with the outer housing 11 through the transmission chain, causing the cleaning part to move from the outward swing position to the inward retraction position. When the swing housing 12 swings to its retracted limit position, the outer housing 11 blocks the swing housing 12, preventing it from swinging further. At this time, the main shaft 21 continues to output reverse rotational power, which overcomes the self-locking force of the threaded engagement, causing relative rotation between the third mating sleeve 233 and the fourth mating sleeve 234. Since the fourth mating sleeve 234 is restricted from rotation by the second damping sleeve 235, the third mating sleeve 233, during its reverse rotation, drives itself to rise axially along the output shaft 231 through the threaded engagement, thereby lifting the cleaning component away from the working surface. When the third mating sleeve 233 rises to its limit position, its continued reverse rotation will drive the fourth mating sleeve 234 to overcome the rotational resistance of the second damping sleeve 235 and rotate synchronously in the opposite direction. However, at this point, the cleaning component has already been lifted away from the working surface. Alternatively, depending on cleaning requirements, the clutch 32 can be switched back to engage with the first bevel gear 24, allowing the cleaning component to perform a cleaning action in the retracted position with forward rotation.

[0033] Understandably, regardless of whether the device is extended or retracted, when the clutch 32 engages with the first bevel gear 24 and the main shaft 21 rotates forward, the output shaft 231 ultimately outputs forward rotation. When the clutch 32 engages with the second bevel gear 25 and the main shaft 21 rotates in the opposite direction, the output shaft 231 still outputs forward rotation due to the reversing effect caused by the relative arrangement of the teeth of the first bevel gear 24 and the second bevel gear 25. In other words, no matter how the working mode of the cleaning device is switched or how the drive direction of the main shaft 21 changes, as long as the bevel gear engaged by the clutch 32 is switched synchronously, the cleaning rotation direction of the output shaft 231 and the cleaning component can always be kept positive, thus improving the cleaning effect. Example 2: The cleaning device in this embodiment includes a body, a main motor, a cleaning component, and the compact transmission mechanism described in Embodiment 1. The outer casing 11 is fixed to the bottom of the body, and the main motor is mounted on the outer casing 11. The output end of the main motor is connected to the main shaft 21 for driving the main shaft 21 to rotate. The cleaning component is fixedly connected to the end of the output shaft 231 of the output component 23 away from the transmission shaft 22 and can rotate synchronously with the output shaft 231. The cleaning device also includes a drive wheel assembly, which is mounted on the bottom of the body for driving the body to move on the surface to be cleaned.

[0034] In summary, because the teeth of the first bevel gear 24 and the second bevel gear 25 are arranged opposite each other and both mesh with the same end of the transmission shaft 22, the different meshing positions of the first bevel gear 24 and the second bevel gear 25 allow the clutch 32, which moves up and down along the axial direction of the main shaft 21, to selectively engage with either the first bevel gear 24 or the second bevel gear 25. When the drive direction of the main motor changes due to the switching of the working mode, only the bevel gear engaged by the clutch 32 needs to be switched synchronously to offset the influence of the main shaft 21's rotation change on the output rotation of the transmission shaft 22. This ensures that the cleaning rotation direction of the output component 23 and the cleaning component remains consistent regardless of whether the main shaft 21 rotates forward or backward, effectively improving the cleaning effect. Furthermore, the subsequent transmission chain formed by the transmission shaft 22 and the output component 23 is shared by the first bevel gear 24 and the second bevel gear 25, eliminating the need for two independent transmission paths. This significantly reduces the number of transmission parts, resulting in a more compact overall structure, which is beneficial for integrated arrangement in space-constrained cleaning devices such as robotic vacuum cleaners.

[0035] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A compact transmission mechanism, characterized in that, include: Housing assembly (1); The transmission assembly (2) includes a main shaft (21), a transmission shaft (22), an output component (23), a first bevel gear (24), and a second bevel gear (25). The main shaft (21) is rotatably mounted on the housing assembly (1). The first bevel gear (24) and the second bevel gear (25) are respectively rotatably sleeved on the main shaft (21), and the teeth of the first bevel gear (24) and the teeth of the second bevel gear (25) are opposite to each other. One end of the transmission shaft (22) meshes with the first bevel gear (24) and the second bevel gear (25) respectively. The other end of the transmission shaft (22) is connected to the output component (23) in a transmission manner. The output component (23) is rotatably mounted on the housing assembly (1). as well as The clutch assembly (3) includes a clutch drive (31) and a clutch (32). The clutch (32) is movably sleeved on the outside of the main shaft (21) in the lifting direction, and the clutch (32) can rotate synchronously with the main shaft (21). The clutch drive (31) is configured to drive the clutch (32) to lift, so that the clutch (32) engages with the first bevel gear (24) or the second bevel gear (25).

2. The compact transmission mechanism according to claim 1, characterized in that, The clutch component (32) includes a clutch lifting part (321) and a clutch rotating part (322). The clutch rotating part (322) is movably sleeved on the outside of the main shaft component (21) in the lifting direction, so that the main shaft component (21) can be connected to the first bevel gear component (24) or the second bevel gear component (25) through the clutch rotating part (322). The clutch rotating part (322) is configured to rotate synchronously with the main shaft component (21). One end of the clutch lifting part (321) is rotatably sleeved on the outside of the clutch rotating part (322). The clutch driving component (31) is configured to drive the clutch lifting part (321) to lift.

3. The compact transmission mechanism according to claim 2, characterized in that, The clutch assembly (3) further includes a first damping element (33). The clutch drive element (31) includes a clutch drive part (311), a first mating sleeve (312), and a second mating sleeve (313). The first mating sleeve (312) is rotatably sleeved on the main shaft (21). The second mating sleeve (313) is screwed on the first mating sleeve (312). The first damping element (33) is disposed on the housing assembly (1) and sleeved on the second mating sleeve (313). The clutch drive part (311) is configured to drive the first mating sleeve (312) to rotate. The other end of the clutch lifting part (321) is connected to the second mating sleeve (313).

4. The compact transmission mechanism according to claim 2, characterized in that, The outer surface of the clutch rotating part (322) is provided with a rotating groove (3221). One end of the clutch lifting part (321) is embedded in the rotating groove (3221), so that the clutch rotating part (322) and the clutch lifting part (321) move up and down synchronously in the lifting direction, and the clutch rotating part (322) can rotate relative to the clutch lifting part (321).

5. The compact transmission mechanism according to claim 2, characterized in that, The outer surface of the main shaft (21) is provided with a flat part, and the clutch rotating part (322) rotates synchronously with the main shaft (21) through the flat part.

6. The compact transmission mechanism according to claim 1, characterized in that, The housing assembly (1) includes an outer shell (11) and a swing housing (12). One end of the swing housing (12) is rotatably disposed on the outer shell (11), and the other end of the swing housing (12) can swing relative to the outer shell (11). The main shaft (21) passes through one end of the swing housing (12) and is rotatably disposed on the outer shell (11). The output component (23) passes through the other end of the swing housing (12).

7. The compact transmission mechanism according to claim 1, characterized in that, The transmission shaft component (22) includes a transmission shaft (221), a third bevel tooth (222), and a fourth bevel tooth (223). The third bevel tooth (222) and the fourth bevel tooth (223) are respectively located at both ends of the transmission shaft (221). The third bevel tooth (222) meshes with the first bevel tooth component (24) and the second bevel tooth component (25), respectively. The fourth bevel tooth (223) meshes with the output component (23).

8. The compact transmission mechanism according to claim 7, characterized in that, The output component (23) includes an output shaft (231) and a fifth bevel tooth (232). The fifth bevel tooth (232) is located at one end of the output shaft (231) and meshes with the fourth bevel tooth (223).

9. The compact transmission mechanism according to claim 8, characterized in that, The output component (23) further includes a third mating sleeve (233), a fourth mating sleeve (234), and a second damping sleeve (235). The third mating sleeve (233) is sleeved outside the output shaft (231), the fourth mating sleeve (234) is screwed outside the third mating sleeve (233), and the second damping sleeve (235) is disposed on the housing assembly (1) and sleeved outside the fourth mating sleeve (234).

10. A cleaning device, characterized in that, Includes the compact transmission mechanism as described in any one of claims 1-9.

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