Rolling brush assembly for robotic vacuum cleaner and robotic vacuum cleaner

Abstract

A rolling brush assembly for a robotic vacuum cleaner and a robotic vacuum cleaner. The rolling brush assembly comprises a rotating spindle (10) having a cutting mechanism (50), and a reciprocating inner shaft (20) and a guide inner shaft (30) penetrating through the rotating spindle (10), wherein the cutting operation of the cutting mechanism (50) may be triggered by coaxial relative rotation between the reciprocating inner shaft (20) and the guide inner shaft (30); and the rolling brush assembly may further comprise a clutch mechanism (60), which is used for controlling, according to the rotation direction of the rotating spindle (10), the coaxial relative rotation between the reciprocating inner shaft (20) and the guide inner shaft (30). The control of the clutch mechanism (60) over the coaxial relative rotation between the reciprocating inner shaft (20) and the guide inner shaft (30) can immediately take effect by means of differentiated one-way constraints respectively formed on the guide inner shaft (30) in a first rotation direction and a second rotation direction. Thus, the cutting operation of the cutting mechanism (50) can be started and stopped without the need for additional operations such as an axial movement operation, and non-delay control in response to the rotation of the rotating spindle (10) in the first rotation direction or the second rotation direction is implemented.

Description

Roller brush assembly for sweeping robot and sweeping robot

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 27, 2024, with application number 202410217168.1 and invention name “Roller brush assembly for sweeping robot and sweeping machine”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of intelligent cleaning, and in particular to a roller brush assembly for a sweeping robot, and a sweeping robot. Background Art

[0003] The robot vacuum cleaner may include a mobile chassis and a roller brush assembly mounted on the mobile chassis. The roller brush assembly may contact the ground area below the mobile chassis, and dirt in the ground area below the mobile chassis may be swept into the interior of the robot vacuum cleaner by the rotating roller brush assembly. For example, discrete dirt such as dust and food crumbs may be swept into the interior of the robot vacuum cleaner and then sucked into a dust collection member (such as a hard dust box or a flexible dust bag) of the robot vacuum cleaner.

[0004] The roller brush assembly may also be equipped with a cutting mechanism, which may include fixed teeth and movable teeth. The movable teeth may reciprocate axially relative to the fixed teeth in response to the rotation of the roller brush assembly. Thus, when filamentary dirt such as hair is easily entangled in the roller brush assembly, the axial reciprocating movement of the movable teeth relative to the fixed teeth may cut the filamentary dirt entangled in the roller brush assembly. This cutting and wiping operation may cut the filamentary dirt entangled in the roller brush assembly into debris, and the cut debris may be sucked into the dust collection member like discrete dirt. This avoids the need for manual cleaning of the filamentary dirt entangled in the roller brush assembly.

[0005] For roller brush assemblies that include a cutting mechanism, the movable and fixed teeth continuously rub against each other during the cutting operation. This friction not only reduces the lifespan of the cutting mechanism but also generates excessive noise. Furthermore, if the cutting mechanism is operating without filaments of dirt entangled in the roller brush assembly, it also generates unnecessary power consumption.

[0006] To reduce friction between the movable teeth and the fixed teeth, the roller brush assembly can selectively rotate in two opposite rotational directions, and the roller brush assembly can be further configured with a clutch mechanism. The clutch mechanism can be in a first state when the roller brush assembly rotates in one rotational direction, and in a second state when the roller brush assembly rotates in the other rotational direction. The cutting operation can be initiated only when the clutch mechanism is in the first state, and stopped when the clutch mechanism is in the second state. Thus, by controlling the rotational direction of the roller brush assembly to change the state of the clutch mechanism, the cutting operation can be initiated only when cleaning filamentous dirt.

[0007] Each time the clutch mechanism switches between the first state and the second state, an axial movement operation needs to be performed, and each state switch needs to wait until the axial movement operation is completed before it can take effect. Therefore, when the clutch mechanism controls the start and stop of the cutting operation of the cutting mechanism, there will be a delay caused by the clutch mechanism performing the axial movement operation.

[0008] Therefore, how to shorten the control delay of the cutting operation of the cutting mechanism has become a technical problem to be solved in the prior art. Summary of the Invention

[0009] In an embodiment of the present application, a roller brush assembly for a sweeping robot and a sweeping robot are provided, which help to shorten the control delay of the cutting operation of the cutting mechanism.

[0010] The present application provides a roller brush assembly for a sweeping robot, which may include:

[0011] a rotating main shaft, the rotating main shaft being used to drive the hoisting mechanism and the cutting mechanism to rotate in a first rotation direction or a second rotation direction in response to an external power;

[0012] a reciprocating inner shaft, the reciprocating inner shaft being passed through the rotating main shaft, and the reciprocating axial movement of the reciprocating inner shaft relative to the rotating main shaft in the axial direction of the rotating main shaft is used to trigger the cutting mechanism to perform a cutting operation;

[0013] A guide inner shaft, the guide inner shaft being passed through the rotating main shaft, wherein the coaxial relative rotation between the guide inner shaft and the reciprocating inner shaft is used to induce reciprocating axial movement of the reciprocating inner shaft relative to the rotating main shaft;

[0014] a clutch mechanism, the clutch mechanism being used to form the following unidirectional constraints on the guide inner shaft in the first rotation direction and the second rotation direction respectively;

[0015] a one-way synchronization constraint that takes effect in response to the rotation of the rotational main shaft about the first rotational direction, the one-way synchronization constraint being used to constrain the guide inner shaft to rotate synchronously with the reciprocating inner shaft to prohibit coaxial relative rotation between the guide inner shaft and the reciprocating inner shaft;

[0016] A one-way anti-rotation constraint takes effect in response to the rotation of the rotating main shaft around the second rotation direction, and is used to prevent the guide inner shaft and the reciprocating inner shaft from rotating synchronously to enable coaxial relative rotation between the guide inner shaft and the reciprocating inner shaft.

[0017] In some examples, optionally, the reciprocating inner shaft is constrained to rotate synchronously with the rotating main shaft in any of the first rotation direction and the second rotation direction, and the one-way synchronization constraint is used to constrain the guide inner shaft to rotate synchronously with the reciprocating inner shaft following the rotating main shaft; and / or, the rotating main shaft has a first shaft end for receiving the external power, and a second shaft end opposite to the first shaft end, and the roller brush assembly also includes a fixed end cap arranged at the second shaft end of the rotating main shaft, and the rotating main shaft is used to rotate relative to the fixed end cap in the first rotation direction or the second rotation direction in response to the external power, and the one-way anti-rotation constraint is used to lock the guide inner shaft to the fixed end cap when the reciprocating inner shaft rotates synchronously with the rotating main shaft.

[0018] In some examples, optionally, the clutch mechanism includes a first one-way bearing and a second one-way bearing, the free rotation directions of the first one-way bearing and the second one-way bearing are opposite, and: in response to the rotation of the rotating main shaft around the first rotation direction, the first one-way bearing generates the one-way synchronization constraint, and the second one-way bearing is in a free rotation state; in response to the rotation of the rotating main shaft around the second rotation direction, the second one-way bearing generates the one-way anti-rotation constraint, and the first one-way bearing is in a free rotation state.

[0019] In some examples, optionally, the reciprocating inner shaft is used to rotate synchronously with the rotating main shaft in any of the first rotation direction and the second rotation direction, the rotating main shaft has a first shaft end for receiving the external power, and a second shaft end opposite to the first shaft end, the roller brush assembly also includes a fixed end cap arranged at the second shaft end of the rotating main shaft, the rotating main shaft is used to rotate relative to the fixed end cap in the first rotation direction or the second rotation direction in response to the external power; the guide inner shaft is coaxially matched with the rotating main shaft through the first one-way bearing, and the guide inner shaft is coaxially matched with the fixed end cap through the second one-way bearing, and: in response to the rotation of the rotating main shaft around the first rotation direction, the first one-way bearing is rotated by the rotating main shaft The one-way synchronous constraint is formed by locking the rotational freedom of the guide inner shaft, and the second one-way bearing in a free rotation state releases the rotational freedom of the guide inner shaft relative to the fixed end cover, so that the guide inner shaft subject to the one-way synchronous constraint rotates synchronously with the reciprocating inner shaft and follows the rotating main shaft; in response to the rotation of the rotating main shaft around the second rotation direction, the second one-way bearing forms the one-way anti-rotation constraint by locking the rotational freedom of the guide inner shaft relative to the fixed end cover, and the first one-way bearing in a free rotation state releases the rotational freedom of the rotating main shaft relative to the guide inner shaft, so that when the reciprocating inner shaft rotates synchronously with the rotating main shaft, the guide inner shaft subject to the one-way anti-rotation constraint is locked to the fixed end cover.

[0020] In some examples, optionally, the guide inner shaft has a limiting flange, the fixed end cover has an end cover cover plate, and the first one-way bearing and the second one-way bearing are limited between the limiting flange and the end cover cover plate in the axial direction.

[0021] In some examples, optionally, the clutch mechanism further includes a bearing isolation washer, wherein the bearing isolation washer is sleeved on the guide inner shaft, and the bearing isolation washer is located between the first one-way bearing and the second one-way bearing.

[0022] In some examples, optionally, the guide inner shaft has a limiting flange, and the clutch mechanism further includes an axial limiting washer, which is sleeved on the guide inner shaft and located between the first one-way bearing and the limiting flange.

[0023] In some examples, optionally, the reciprocating inner shaft is located in the main shaft inner cavity of the rotating main shaft, the cavity wall of the main shaft inner cavity has a shaft cavity key surface, the reciprocating inner shaft has an inner shaft key surface, and the limiting fit between the shaft cavity key surface and the inner shaft key surface constrains the reciprocating inner shaft to rotate synchronously with the rotating main shaft in any rotation direction of the first rotation direction and the second rotation direction; the unidirectional synchronization constraint is used to constrain the guide inner shaft to rotate synchronously with the rotating main shaft together with the reciprocating inner shaft.

[0024] In some examples, optionally, the main shaft inner cavity includes a first cavity section and a second cavity section connected to each other in the axial direction, and the inner diameter of the second cavity section is larger than the inner diameter of the first cavity section; the reciprocating inner shaft includes a transmission shaft, the inner shaft key surface is located on the transmission shaft, the transmission shaft is located in the first cavity section, and the shaft cavity key surface is located on the cavity wall of the first cavity section; the reciprocating inner shaft also includes a guide sleeve, the outer diameter of the guide sleeve is larger than the outer diameter of the transmission shaft, the guide sleeve is located in the second cavity section, the guide sleeve is coaxially sleeved on the guide inner shaft in the second cavity section, and the coaxial cooperation between the guide sleeve and the guide inner shaft is used to: during the period of coaxial relative rotation between the guide inner shaft and the reciprocating inner shaft, cause the reciprocating inner shaft to move reciprocatingly axially relative to the rotating main shaft.

[0025] In some examples, optionally, the guide inner shaft has an annular guide groove, and the axial direction of the annular guide groove is tilted relative to the axial direction; the guide sleeve has a ball receiving hole, and the ball receiving hole accommodates balls; wherein the balls are in rolling engagement with the annular guide groove, and during a period of coaxial relative rotation between the guide inner shaft and the reciprocating inner shaft, the motion trajectory of the balls along the annular guide groove around the guide inner shaft has a reciprocating axial offset in the axial direction, and the reciprocating axial offset is used to induce reciprocating axial movement of the reciprocating inner shaft relative to the rotating main shaft.

[0026] In some examples, optionally, the cutting mechanism includes a fixed tooth member and a movable tooth member, and the cutting operation of the cutting mechanism includes reciprocating axial movement of the movable tooth member relative to the fixed tooth member in the axial direction; the reciprocating inner shaft has an inner shaft slot, and the movable tooth member has a driving insert arm, the driving insert arm extends into the first cavity section along the radial direction of the rotating main shaft, and the driving insert arm is fixedly inserted into the inner shaft slot, so that the reciprocating inner shaft moves reciprocating axially relative to the rotating main shaft in the axial direction of the rotating main shaft, causing the movable tooth member to move reciprocating axially relative to the fixed tooth member in the axial direction; the inner shaft slot is located on the transmission shaft, and the inner shaft slot passes through the transmission shaft in the radial direction perpendicular to the inner shaft key surface.

[0027] In some examples, optionally, the rotating spindle has a first shaft end and a second shaft end opposite to each other in the axial direction, and the roller brush assembly further includes a driving end cover and a fixed end cover, the driving end cover is located at the first shaft end of the rotating spindle, and the fixed end cover is located at the second shaft end of the rotating spindle, the external power is applied to the driving end cover, and the driving end cover is used to drive the rotating spindle to rotate relative to the fixed end cover in any rotation direction of the first rotation direction and the second rotation direction in response to the external power; the rotating spindle has a first cutting blind area between the cutting mechanism and the driving end cover, and a second cutting blind area between the cutting mechanism and the fixed end cover; the roller brush assembly further includes a first sheath and a second sheath, the first sheath is arranged in the first cutting blind area, the second sheath is arranged in the second cutting blind area, and both the first sheath and the second sheath are stationary relative to the fixed end cover.

[0028] In some examples, optionally, the first sheath and the second sheath protrude radially outward relative to the cutting mechanism in a radial direction of the rotating shaft.

[0029] In some examples, optionally, the rotating spindle has a pair of stop ribs, and the stop ribs are located at the range boundary of the deployment range of the cutting mechanism in the axial direction, so that the filamentous dirt wrapped around the rotating spindle is restricted by the pair of stop ribs within the deployment range of the cutting mechanism; the axial gap between each of the first sheath and the second sheath and the adjacent stop ribs is covered and blocked by a flexible seal.

[0030] In another embodiment of the present application, a sweeping robot may include a mobile chassis, a drive motor supported on the mobile chassis, and a roller brush assembly as described in the above embodiment, wherein the mobile chassis has a chassis opening, the roller brush assembly is installed at the chassis opening, and the drive motor is used to generate the external power.

[0031] Based on the above-mentioned embodiment of the present application, the roller brush assembly may include a rotating main shaft having a cutting mechanism, and a reciprocating inner shaft and a guide inner shaft passing through the rotating main shaft. The cutting operation of the cutting mechanism may be triggered by the coaxial relative rotation between the reciprocating inner shaft and the guide inner shaft, and the roller brush assembly may further include a clutch mechanism for controlling the coaxial relative rotation between the reciprocating inner shaft and the guide inner shaft according to the rotation direction of the rotating main shaft. The control of the coaxial relative rotation between the reciprocating inner shaft and the guide inner shaft by the clutch mechanism may take effect immediately by forming differentiated unidirectional constraints on the guide inner shaft in the first rotation direction and the second rotation direction, respectively. Therefore, the starting and stopping of the cutting operation of the cutting mechanism may be implemented without delay control in response to the rotation of the rotating main shaft in the first rotation direction or the second rotation direction without the need for additional operations such as axial movement operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0033] FIG1 is a schematic diagram of the assembly structure of a roller brush assembly for a sweeping robot according to an embodiment of the present application;

[0034] FIG2 is a schematic diagram of the exploded structure of a roller brush assembly for a sweeping robot according to an embodiment of the present application;

[0035] FIG3 is a cross-sectional view of a roller brush assembly for a sweeping robot according to an embodiment of the present application;

[0036] FIG4 is a schematic structural diagram of a reciprocating inner shaft of a roller brush assembly for a sweeping robot according to an embodiment of the present application;

[0037] FIG5 is a schematic diagram of the assembly relationship between the reciprocating inner shaft and the cutting mechanism of the roller brush assembly for the sweeping robot in an embodiment of the present application;

[0038] FIG6 is a schematic diagram of the assembly structure of the inner shaft kit of the roller brush assembly for the sweeping robot according to an embodiment of the present application;

[0039] FIG7 is a schematic diagram of the exploded structure of the inner shaft kit of the roller brush assembly for the sweeping robot according to an embodiment of the present application;

[0040] FIG8 is a cross-sectional view of an inner shaft kit of a roller brush assembly for a sweeping robot according to an embodiment of the present application;

[0041] FIG9 a is a schematic diagram of a partial structure of a sweeping robot in an embodiment of the present application;

[0042] FIG9b is a schematic structural diagram of FIG9a when the roller brush mounting frame is not shown;

[0043] FIG9 c is a schematic diagram of the overall structure of the sweeping robot in an embodiment of the present application;

[0044] FIG10 is a schematic diagram of the assembly structure of the roller brush assembly and the roller brush mounting frame of the sweeping robot in an embodiment of the present application.

[0045] Reference numerals: rotating spindle 10, spindle inner cavity 100, first cavity section 100a, second cavity section 100b, spindle body 11, split fillet 12, shaft cavity key surface 13, positioning member 14, stop rib 15, guide comb 17; reciprocating inner shaft 20, transmission shaft 21, guide sleeve 22, ball receiving hole 220, ball 225, inner shaft key surface 23, inner shaft slot 25; guide inner shaft 30, guide shaft section 31, annular guide groove 310, restraining shaft section 32, spindle restraining section 321, end cover restraining section 322, fixing buckle 33, limiting flange 36; hoisting mechanism 40, covering base sleeve 41, avoidance notch 410, hoisting brush 43, hoisting sheet 45; Cutting mechanism 50, fixed tooth member 51, fixed tooth row 510, fixed rack plate 511, fixed tooth lug 512, positioning through-hole 513, movable tooth member 52, movable tooth row 520, movable rack plate 521, movable tooth lug 522, guide slot 523, driving insert arm 525; clutch mechanism 60, first one-way bearing 61, second one-way bearing 62, bearing isolation washer 63, axial limit washer 66; driving end cover 71, first sleeve 710, transmission shaft head 711, fixed end cover 72, second sleeve 720, end cover cover plate 721, end cover peripheral wall 722, fixed card slot 723, flexible seal 73; movable chassis 80, chassis opening 800, running wheel 81, steering wheel 82, side sweeping brush 83, water storage chamber 84, roller brush mounting frame 85, snap mechanism 850; Roller brush assembly 90, main shaft slit A. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of this application more clearly understood, the present application is further described below with reference to the accompanying drawings and examples. It is apparent that the described examples are only a portion of the embodiments of this application, and not all of them. All other embodiments derived by persons of ordinary skill in the art based on the examples in this application are intended to fall within the scope of protection of this application.

[0047] In order to make the objectives, technical solutions and advantages of this application more clear, the application is further described in detail below with reference to the accompanying drawings and examples.

[0048] Figure 1 is a schematic diagram of the assembly structure of a roller brush assembly for a sweeping robot according to an embodiment of the present application. Figure 2 is a schematic diagram of the exploded structure of a roller brush assembly for a sweeping robot according to an embodiment of the present application. Figure 3 is a cross-sectional view of the roller brush assembly for a sweeping robot according to an embodiment of the present application.

[0049] Referring to Figures 1 to 3, in an embodiment of the present application, a roller brush assembly for a sweeping robot may include a rotating main shaft 10, a reciprocating inner shaft 20, a guide inner shaft 30 and a clutch mechanism 60.

[0050] The rotating main shaft 10 may be provided with a hoisting mechanism 40 and a cutting mechanism 50 , and the rotating main shaft 10 is used to drive the hoisting mechanism 40 and the cutting mechanism 50 to rotate in a first rotation direction or a second rotation direction in response to external power.

[0051] The reciprocating inner shaft 20 is disposed through the rotating main shaft 10. The reciprocating axial movement of the reciprocating inner shaft 20 relative to the rotating main shaft 10 in the axial direction of the rotating main shaft 10 is used to trigger the cutting mechanism 50 to perform a cutting operation. The guide inner shaft 30 is disposed through the rotating main shaft 10. Specifically, the guide inner shaft 30 is partially disposed through the reciprocating inner shaft 20 and partially on the main shaft 10. The coaxial relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20 is used to trigger the reciprocating axial movement of the reciprocating inner shaft 20 relative to the rotating main shaft 10. The clutch mechanism 60 is used to form the following unidirectional constraints on the guide inner shaft 30 in the first rotation direction and the second rotation direction, respectively:

[0052] The unidirectional synchronization constraint, which takes effect in response to the rotation of the rotating spindle 10 in the first rotational direction, constrains the guide inner shaft 30 to rotate synchronously with the reciprocating inner shaft 20, thereby prohibiting coaxial relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20. When the rotating spindle 10 rotates in the first rotational direction, the clutch mechanism 60 imposes a unidirectional synchronization constraint on the guide inner shaft 30. At this point, the guide inner shaft 30 and the reciprocating inner shaft 20 rotate simultaneously with the rotating spindle 10. Since relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20 is not occurring, the reciprocating inner shaft 20 cannot reciprocate. Consequently, the cutting mechanism 50 cannot perform a cutting operation.

[0053] A one-way anti-rotation constraint is activated in response to rotation of the rotating spindle 10 in a second rotational direction. This constraint prevents the guide inner shaft 30 from rotating synchronously with the reciprocating inner shaft 20, thereby enabling coaxial relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20. The first rotational direction is either clockwise or counterclockwise, and the second rotational direction is the other of the two. When the rotating spindle 10 rotates in the second direction, the clutch mechanism 60 creates a one-way anti-rotation constraint on the guide inner shaft 30. At this point, the guide inner shaft 30 remains stationary, while the reciprocating inner shaft 20 rotates with the rotating spindle 10. This results in relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20, causing the reciprocating inner shaft 20 to reciprocate along the axial direction of the rotating spindle 10. This triggers the cutting mechanism 50 to perform a cutting operation.

[0054] In this embodiment, the roller brush assembly may include a rotating main shaft 10 having a cutting mechanism 50, and a reciprocating inner shaft 20 and a guide inner shaft 30 that pass through the rotating main shaft 10. The cutting operation of the cutting mechanism 50 may be triggered by the coaxial relative rotation between the reciprocating inner shaft 20 and the guide inner shaft 30. In addition, the roller brush assembly may further include a clutch mechanism 60 for controlling the coaxial relative rotation between the reciprocating inner shaft 20 and the guide inner shaft 30 based on the rotation direction of the rotating main shaft 10. The clutch mechanism 60 can control the coaxial relative rotation between the reciprocating inner shaft 20 and the guide inner shaft 30 by immediately forming differentiated unidirectional constraints on the guide inner shaft 30 in a first rotational direction and a second rotational direction, respectively. Therefore, the cutting operation of the cutting mechanism 50 can be started and stopped without delay in response to the rotation of the rotating main shaft 10 in the first rotational direction or the second rotational direction without the need for additional operations such as axial movement operations.

[0055] In an embodiment of the present application, the rotating main shaft 10 may have a first shaft end and a second shaft end opposite to each other in its axial direction, wherein the first shaft end of the rotating main shaft 10 is used to receive external power, and the second shaft end of the rotating main shaft 10 can be considered as a driven end that does not receive external power.

[0056] In this case, the roller brush assembly may further include a driving end cover 71 and a fixed end cover 72. The driving end cover 71 may be located at the first axial end of the rotating spindle 10, and the external power for driving the rotating spindle 10 to rotate in any one of the first rotation direction and the second rotation direction may be applied to the driving end cover 71. For example, the outer end surface of the driving end cover 71 facing away from the rotating spindle 10 may have a transmission shaft head 711, and the transmission shaft head 711 may be connected to a power source (such as a driving motor) that generates external power; the fixed end cover 72 may be located at the second axial end of the rotating spindle 10, and the fixed end cover 72 may be subjected to an external anti-rotation constraint. Thus, the driving end cover 71 may drive the rotating spindle 10 to rotate relative to the fixed end cover 72 in any one of the first rotation direction and the second rotation direction in response to the external power.

[0057] In an embodiment of the present application, the hoisting mechanism 40 can perform a hoisting operation on the ground area below the chassis of the sweeping robot while following the synchronous rotation of the rotating main shaft 10 in any of the first rotation direction and the second rotation direction, so as to hoist the dirt in the ground area into the interior of the sweeping robot.

[0058] For example, in an embodiment of the present application, the hoisting mechanism 40 may include at least one of a hoisting brush 43 and a hoisting sheet 45 radially radiating from the rotating main shaft 10, wherein the hoisting brush 43 may have discrete bristles, and the hoisting sheet 45 may be made of a flexible material such as rubber that is harder than the bristles. In contrast, the hoisting brush 43 is more effective at hoisting small particles of dirt such as dust, while the hoisting sheet 45 can be used to hoist large particles of dirt that are not easily hoisted by the hoisting brush 43. As a preferred embodiment of the present application, the hoisting mechanism 40 may include both the hoisting brush 43 and the hoisting sheet 45. If the hoisting mechanism 40 includes both the hoisting brush 43 and the hoisting sheet 45, the radial length of the hoisting brush 43 may be greater than the radial length of the hoisting sheet 45. As an alternative solution to save costs in the embodiment of the present application, the hoisting mechanism 40 may also include only the hoisting brush 43.

[0059] For example, in the embodiment of the present application, whether the hoisting mechanism 40 includes both the hoisting brush 43 and the hoisting sheet 45 or only the hoisting brush 43, and the radially radiating end of the hoisting brush 43 can be considered as the outline boundary of the roller brush assembly.

[0060] In the embodiment of the present application, the cutting mechanism 50 is used to perform a cutting operation, and the cutting operation is used to cut the filamentous dirt wound around the rotating spindle 10 .

[0061] Exemplarily, in an embodiment of the present application, the cutting mechanism 50 may include a fixed tooth member 51 and a movable tooth member 52 , and the cutting operation of the cutting mechanism 50 may include the reciprocating axial movement of the movable tooth member 52 relative to the fixed tooth member 51 in the axial direction of the rotating spindle 10 .

[0062] For example, in the illustrated representation of the embodiment of the present application, the fixed tooth member 51 may include a fixed tooth row 510, and the movable tooth member 52 may include a movable tooth row 520, and the fixed tooth row 510 and the movable tooth row 520 are both distributed parallel to the axial direction of the rotating main shaft 10, and the fixed tooth row 510 and the movable tooth row 520 both protrude outside the axial wall of the rotating main shaft 10 in the radial direction of the rotating main shaft 10, and the cutting operation of the cutting mechanism 50 (that is, the reciprocating axial movement of the movable tooth member 52 in the axial direction of the rotating main shaft 10 relative to the fixed tooth member 51) may specifically include the reciprocating axial movement of the movable tooth row 520 in the axial direction of the rotating main shaft 10 relative to the fixed tooth row 510.

[0063] For example, in an embodiment of the present application, the rotating spindle 10 may have a spindle slit A, which may pass through from the axial wall of the rotating spindle 10 to the spindle inner cavity 100 of the rotating spindle 10 in the radial direction of the rotating spindle 10, and the cutting mechanism 50 may be inserted into the spindle slit A, that is, the fixed tooth component 51 and the movable tooth component 52 of the cutting mechanism 50 may be stacked and installed in the spindle slit A, and the fixed tooth row 510 and the movable tooth row 520 both protrude outside the spindle slit A in the radial direction of the rotating spindle 10.

[0064] For example, in the illustrated representation of the embodiment of the present application, the fixed tooth component 51 may also include a fixed rack plate 511 and a fixed tooth lug 512 located in the spindle slot A, the fixed tooth row 510 may be distributed on the edge of the side of the fixed rack plate 511 facing the shaft wall of the rotating spindle 10, the fixed tooth lug 512 may be located on the other side of the fixed rack plate 511 close to the spindle inner cavity 100, the fixed tooth lug 512 may have a positioning through hole 513, and, by using a positioning member 14 such as a positioning pin passing through the positioning through hole 513, the fixed tooth component 51 (i.e., the fixed rack plate 511) may be fixed to the rotating spindle 10 in the spindle slot A.

[0065] For another example, in the illustrated expression of the embodiment of the present application, the movable tooth component 52 may include a movable rack plate 521 and a movable tooth lug 522 located in the main shaft slot A, the movable tooth row 520 may be distributed on the side edge of the movable rack plate 521 facing the shaft wall outside the rotating main shaft 10, the movable tooth lug 522 may be located on the other side of the movable rack plate 521 close to the main shaft inner cavity 100, the movable tooth lug 522 may have a guide long hole 523, which may be parallel to the axial direction of the rotating main shaft 10, and the aforementioned positioning member that passes through the positioning through hole 513 of the fixed tooth component 51 is also passed through the guide long hole 523 of the movable tooth component 52, thereby allowing the movable tooth component 52 to move reciprocating axially relative to the fixed tooth component 51 in the axial direction of the rotating main shaft 10 by utilizing the reciprocating axial sliding of the guide long hole 523 relative to the aforementioned positioning member 14 in the main shaft slot A.

[0066] For example, in an embodiment of the present application, the rotating spindle 10 may further include guide comb teeth 17, and the guide comb teeth 17 may be distributed outside the slit edges on both sides of the spindle slit A, parallel to the axial direction of the rotating spindle 10. Thus, filamentary waste wrapped around the rotating spindle 10 can be guided by the guide comb teeth 17 to: cross the spindle slit A in a direction perpendicular to the axial direction of the rotating spindle 10, that is, along the fixed tooth row 510 and the movable tooth row 520 of the constant-fast cutting mechanism 50 in a direction perpendicular to the axial direction of the rotating spindle 10, thereby making it easier to cut the filamentary waste wrapped around the rotating spindle 10.

[0067] For example, in an embodiment of the present application, in order to facilitate the stacking installation of the fixed tooth component 51 and the movable tooth component 52 of the cutting mechanism 50 in the spindle slit A, the rotating spindle 10 can adopt an assembled structure, that is, the rotating spindle 10 can include a spindle body 11 and a splicing strip 12, wherein the spindle body 11 can have a notch, and the splicing strip 12 can be basically complementary to the notch of the spindle body 11, and when the two are spliced ​​together, the notch forms the spindle slit A.

[0068] Thus, the fixed tooth member 51 and the movable tooth member 52 of the cutting mechanism 50 can be first stacked and installed on one side of the notch wall of the main shaft body 11, and then the split fillet 12 can be filled and installed in the notch of the main shaft body 11, so that the main shaft slit A is formed between the split fillet 12 and the notch wall where the fixed tooth member 51 and the movable tooth member 52 of the cutting mechanism 50 are located. In this case, the guide comb teeth 17 can be distributed on the shaft wall of the main shaft body 11 near the notch wall where the fixed tooth member 51 and the movable tooth member 52 of the cutting mechanism 50 are located, as well as on the fillet surface of the split fillet 12.

[0069] Still referring to Figures 1 to 3, in an embodiment of the present application, in order to control the cutting operation of the cutting mechanism 50, the roller brush assembly may further include an inner shaft kit, which may include a reciprocating inner shaft 20, a guide inner shaft 30 and a clutch mechanism 60.

[0070] In an embodiment of the present application, the reciprocating inner shaft 20 can be passed through the rotating main shaft 10, and the reciprocating inner shaft 20 can move reciprocatingly axially relative to the rotating main shaft 10 in the axial direction of the rotating main shaft 10, and the reciprocating axial movement of the reciprocating inner shaft 20 relative to the rotating main shaft 10 in the axial direction of the rotating main shaft 10 is used to trigger the cutting mechanism 50 to perform a cutting operation.

[0071] For example, in the embodiment of the present application, the reciprocating inner shaft 20 may be entirely located in the spindle inner cavity 100 of the rotating spindle 10 .

[0072] FIG4 is a schematic diagram of the structure of the reciprocating inner shaft of the roller brush assembly for a sweeping robot according to an embodiment of the present application. FIG5 is a schematic diagram of the assembly relationship between the reciprocating inner shaft and the cutting mechanism of the roller brush assembly for a sweeping robot according to an embodiment of the present application. Referring to FIG4 and FIG5, in an embodiment of the present application, the reciprocating inner shaft 20 may have an inner shaft slot 25, and the movable tooth member 52 of the cutting mechanism 50 may have a driving insert arm 525. For example, the driving insert arm 525 may be located on the other side of the movable rack plate 521 near the spindle inner cavity 100. The driving insert arm 525 may extend into the spindle inner cavity 100 along the radial direction of the rotating spindle 10. The driving insert arm 525 may be fixedly inserted into the inner shaft slot 25 of the reciprocating inner shaft 20, so that the reciprocating axial movement of the reciprocating inner shaft 20 relative to the rotating spindle 10 in the axial direction of the rotating spindle 10 can induce the reciprocating axial movement of the movable tooth member 52 relative to the fixed tooth member 51 in the axial direction of the rotating spindle 10.

[0073] For example, in an embodiment of the present application, the reciprocating inner shaft 20 may include a transmission shaft 21 , and the inner shaft slot 25 may be located on the transmission shaft 21 , so that the transmission shaft 21 may be used for transmission connection between the reciprocating inner shaft 20 and the cutting mechanism 50 .

[0074] In an embodiment of the present application, the guide inner shaft 30 can be passed through the rotating main shaft 10, and the guide inner shaft 30 is coaxially matched with the reciprocating inner shaft 20. The coaxial matching of the guide inner shaft 30 and the reciprocating inner shaft 20 allows coaxial relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20, and the coaxial relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20 is used to induce reciprocating axial movement of the reciprocating inner shaft 20 relative to the rotating main shaft 10.

[0075] For example, in an embodiment of the present application, the guide inner shaft 30 can be partially inserted into the main shaft inner cavity 100 of the rotating main shaft 10, and the guide inner shaft 30 can achieve coaxial cooperation with the reciprocating inner shaft 20 in the main shaft inner cavity 100 of the rotating main shaft 10 to allow coaxial relative rotation.

[0076] For example, in an embodiment of the present application, the reciprocating inner shaft 20 may further include a guide sleeve 22, the outer diameter of the guide sleeve 22 may be larger than the outer diameter of the transmission shaft 21, and the guide sleeve 22 may be coaxially sleeved on the guide inner shaft 30, so that the guide sleeve 22 can be used for coaxial matching of the reciprocating inner shaft 20 and the guide inner shaft 30, and the coaxial matching between the guide sleeve 22 and the guide inner shaft 30 is used to: during the period of coaxial relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20, induce reciprocating axial movement of the reciprocating inner shaft 20 relative to the rotating main shaft 10.

[0077] Please refer to Figures 3 to 5. The cutting mechanism 50 includes a fixed tooth member 51 and a movable tooth member 52, and the cutting operation of the cutting mechanism 50 includes the reciprocating axial movement of the movable tooth member 52 relative to the fixed tooth member 51 in the axial direction; the reciprocating inner shaft 20 has an inner shaft slot 25, and the movable tooth member 52 has a driving arm 525, which extends into the first cavity section 100a along the radial direction of the rotating main shaft 10, and the driving arm 525 is fixedly inserted into the inner shaft slot 25, so that the reciprocating inner shaft 20 reciprocates axially relative to the rotating main shaft 10 in the axial direction of the rotating main shaft 10, causing the movable tooth member 52 to reciprocate axially relative to the fixed tooth member 51 in the axial direction; the inner shaft slot 25 is located on the transmission shaft 21, and the inner shaft slot 25 passes through the transmission shaft 21 in the radial direction perpendicular to the inner shaft key surface 23.

[0078] Figure 6 is a schematic diagram of the assembly structure of the inner shaft kit of the roller brush assembly for a sweeping robot according to an embodiment of the present application. Figure 7 is a schematic diagram of the exploded structure of the inner shaft kit of the roller brush assembly for a sweeping robot according to an embodiment of the present application. Figure 8 is a cross-sectional view of the inner shaft kit of the roller brush assembly for a sweeping robot according to an embodiment of the present application.

[0079] Referring to Figures 6 to 8 , in an embodiment of the present application, the guide inner shaft 30 may have an annular guide groove 310, and the axial direction of the annular guide groove 310 may be tilted relative to the axial direction of the rotating main shaft 10. The guide sleeve 22 of the reciprocating inner shaft 20 may have a ball receiving hole 220, and the ball 225 may be received in the ball receiving hole 220. In this case, the ball 225 in the ball receiving hole 220 may roll with the annular guide groove 310. During the period of coaxial relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20, the movement trajectory of the ball 225 around the guide inner shaft 30 along the annular guide groove 310 may have a reciprocating axial offset in the axial direction of the rotating main shaft 10. The reciprocating axial offset is used to induce reciprocating axial movement of the reciprocating inner shaft 20 relative to the rotating main shaft 10.

[0080] Thus, the movement of the balls 225 in the ball receiving hole 220 along the annular guide groove 310 around the guide inner shaft 30 can trigger the guide sleeve 22 where the ball receiving hole 220 is located to drive the reciprocating inner shaft 20 as a whole to produce reciprocating axial movement in the axial direction of the rotating main shaft 10, that is, the reciprocating axial offset of the movement trajectory of the balls 225 can be used to trigger the reciprocating axial movement of the reciprocating inner shaft 20 relative to the rotating main shaft 10.

[0081] For example, in an embodiment of the present application, the guide inner shaft 30 may include a guide shaft segment 31, the guide shaft segment 31 may be located in the main shaft inner cavity 100 of the rotating main shaft 10, the guide shaft segment 31 may form a coaxial fit with the guide shaft sleeve 22 of the reciprocating inner shaft 20 to allow coaxial relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20, and the annular guide groove 310 may be located in the guide shaft segment 31 of the guide inner shaft 30.

[0082] Specifically, when the reciprocating inner shaft 20 and the guide inner shaft 30 rotate relative to each other, the balls 225 roll along the annular guide groove 310 of the guide inner shaft 30. Referring to FIG7 , the motion trajectory of the balls 225 within the annular guide groove 310 is from one end of the guide shaft segment 31 to the other. After reaching one end of the guide shaft segment 31, the balls 225 return to their starting position along the annular guide groove 310, thereby forming a reciprocating motion. Driven by the balls 225, the reciprocating inner shaft 20 reciprocates along the axial direction of the rotating main shaft 10. The reciprocating inner shaft 20 and the guide inner shaft 30 are connected via the balls 225 and the annular guide groove 310, making the structure of the reciprocating inner shaft 20 and the guide inner shaft 30 more stable during the reciprocating motion.

[0083] As shown in FIG. 6 to FIG. 8 , the end portion of the guide inner shaft 30 connected to the fixed end cover 72 is further provided with a fixing buckle 33 for connecting the guide inner shaft 30 to the fixed end cover 72 .

[0084] 3 , a fixing slot 723 is provided on the fixed end cover 72. During use, the fixing slot 723 of the fixed end cover 72 is embedded in the fixing buckle 33 of the guide inner shaft 30 to fix the guide inner shaft 30, thereby avoiding axial displacement of the guide inner shaft 30 during use.

[0085] In the embodiment of the present application, please pay special attention to FIG. 3 , the clutch mechanism 60 is used to form the following differentiated unidirectional constraints on the guide inner shaft 30 in the first rotation direction and the second rotation direction of the rotating main shaft 10 ;

[0086] a one-way synchronization constraint (Ctr_syn) that takes effect in response to the rotation of the rotation main shaft 10 about the first rotation direction, the one-way synchronization constraint (Ctr_syn) being used to constrain the guide inner shaft 30 to rotate synchronously with the reciprocating inner shaft 20, that is, the one-way synchronization constraint (Ctr_syn) is used to constrain the guide inner shaft 30 to rotate synchronously with the reciprocating inner shaft 20 in the first rotation direction to prohibit coaxial relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20. Thus, based on the one-way synchronization constraint (Ctr_syn), the coaxial relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20 can be immediately prohibited in response to the rotation of the rotation main shaft 10 about the first rotation direction;

[0087] A one-way anti-rotation constraint (Ctr_stp) is effective in response to the rotation of the rotating main shaft 10 around the second rotation direction. The one-way anti-rotation constraint (Ctr_stp) is used to prevent the guide inner shaft 30 and the reciprocating inner shaft 20 from rotating synchronously, that is, the one-way anti-rotation constraint (Ctr_stp) is used to prevent the guide inner shaft 30 and the reciprocating inner shaft 20 from rotating synchronously in the second rotation direction, so as to enable the coaxial relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20. Thus, based on the one-way anti-rotation constraint (Ctr_stp), the coaxial relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20 can be enabled instantly in response to the rotation of the rotating main shaft 10 around the second rotation direction, and the one-way anti-rotation constraint (Ctr_stp) will not hinder (that is, allow) the reciprocating axial movement of the guide inner shaft 30 and the reciprocating inner shaft 20 in the axial direction of the rotating main shaft 10.

[0088] In an embodiment of the present application, if the reciprocating inner shaft 20 is constrained to rotate synchronously with the rotating main shaft 10 in any of the first rotation direction and the second rotation direction, then the unidirectional synchronization constraint (Ctr_syn) can be used to constrain the guide inner shaft 30 to rotate synchronously with the reciprocating inner shaft 20 and the rotating main shaft 10.

[0089] For example, referring to Figures 2 and 3, the reciprocating inner shaft 20 can be located in the spindle inner cavity 100 of the rotating spindle 10. The cavity wall of the spindle inner cavity 100 can have a shaft cavity key surface 13, and the reciprocating inner shaft 20 can have an inner shaft key surface 23. Moreover, the limited fit between the shaft cavity key surface 13 and the inner shaft key surface 23 can constrain the reciprocating inner shaft 20 to rotate synchronously with the rotating spindle 10 in any of the first and second rotation directions. The one-way synchronization constraint is used to constrain the guide inner shaft 30 to rotate synchronously with the rotating spindle 10 together with the reciprocating inner shaft 20.

[0090] For example, if the reciprocating inner shaft 20 includes a transmission shaft 21, and the inner shaft slot 25 is located on the transmission shaft 21, then the inner shaft key surface 23 can also be located on the transmission shaft 21, and the inner shaft slot 25 can pass through the transmission shaft 21 perpendicular to the inner shaft key surface 23 in the radial direction of the rotating main shaft 10.

[0091] In an embodiment of the present application, if the roller brush assembly also includes a fixed end cover 72 arranged at the second axial end of the rotating main shaft 10, and the rotating main shaft 10 is used to rotate relative to the fixed end cover 72 in a first rotation direction or a second rotation direction in response to external power, then a one-way anti-rotation constraint (Ctr_stp) can be used to lock the guide inner shaft 30 on the fixed end cover 72 when the reciprocating inner shaft 20 rotates synchronously with the rotating main shaft 10.

[0092] In some implementations of the present application, as shown in FIG. 6 to FIG. 8 , the clutch mechanism 60 includes a first one-way bearing 61 and a second one-way bearing 62 , and the free rotation directions of the first one-way bearing 61 and the second one-way bearing 62 are opposite.

[0093] Furthermore, in response to the rotation of the rotation main shaft 10 around the first rotation direction, the first one-way bearing 61 generates a one-way synchronous constraint, and the second one-way bearing 62 is in a free rotation state.

[0094] In response to the rotation of the rotation main shaft 10 about the second rotation direction, the second one-way bearing 62 generates a one-way rotation restraint, and the first one-way bearing 61 is in a free rotation state.

[0095] In the embodiment of the present application, in order to simplify the structure required for the clutch mechanism 60 to provide the above-mentioned one-way synchronization constraint (Ctr_syn) and one-way anti-rotation constraint (Ctr_stp), the clutch mechanism 60 may include a first one-way bearing 61 and a second one-way bearing 62 having opposite free rotation directions. The first one-way bearing 61 and the second one-way bearing 62 are both bearings that can only rotate clockwise or counterclockwise, wherein:

[0096] In response to the rotation of the rotating main shaft 10 around the first rotation direction, the first one-way bearing 61 immediately generates a one-way synchronous constraint (Ctr_syn), and the second one-way bearing 62 is in a free rotation state, so that the guide inner shaft 30 rotates synchronously with the rotating main shaft 10, and there is no relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20.

[0097] In response to the rotation of the rotating spindle 10 in the second rotational direction, the second one-way bearing 62 immediately generates a one-way anti-rotation constraint (Ctr_stp), and the first one-way bearing 61 is in a free-rotation state, causing the guide inner shaft 30 to be stationary and rotate relative to the rotating spindle 10. At the same time, because the reciprocating inner shaft 20 rotates synchronously with the rotating spindle 10, the reciprocating inner shaft 20 and the guide inner shaft 30 rotate relative to each other, thereby achieving reciprocating motion of the reciprocating inner shaft 20 along the axial direction of the rotating spindle 10.

[0098] In this embodiment, the conventional cleaning process does not cut, and the brush cuts only when the brush is reversed, thereby solving the problem of ineffective work and power consumption caused by the conventional cutting roller brush cutting all the time.

[0099] The first one-way bearing 61 and the second one-way bearing 62 are used to perform one-way synchronization constraints (Ctr_syn) and one-way anti-rotation constraints (Ctr_stp) on the guide inner shaft 30, so that clutch cutting can be achieved even in the case of low-speed reversal. Clutch cutting does not require high speed, thus avoiding the noise and additional power consumption caused by high-speed rotation.

[0100] For example, in the embodiment of the present application, both the first one-way bearing 61 and the second one-way bearing 62 may be sleeved on the guide inner shaft 30 .

[0101] For example, the guide inner shaft 30 may further include a constraining shaft segment 32 , which may be coaxially connected to the guide shaft segment 31 , and the first one-way bearing 61 and the second one-way bearing 62 may be sleeved on the constraining shaft segment 32 of the guide inner shaft 30 .

[0102] In some embodiments of the present application, the reciprocating inner shaft 20 is configured to rotate synchronously with the rotating main shaft 10 in any of a first rotational direction and a second rotational direction. The rotating main shaft 10 has a first shaft end for receiving external power and a second shaft end opposite to the first shaft end. The roller brush assembly further includes a fixed end cap 72 arranged at the second shaft end of the rotating main shaft 10, and the rotating main shaft 10 is configured to rotate relative to the fixed end cap 72 in the first rotational direction or the second rotational direction in response to the external power.

[0103] The first one-way bearing 61 is mounted on the rotating main shaft 10, and the second one-way bearing 62 is mounted on the fixed end cover 72. In this way, the guide inner shaft 30 can be coaxially matched with the rotating main shaft 10 through the first one-way bearing 61 mounted on the rotating main shaft 10, and the guide inner shaft 30 can be coaxially matched with the fixed end cover 72 through the second one-way bearing 62 mounted on the fixed end cover 72.

[0104] Furthermore, in response to the rotation of the rotating main shaft 10 around the first rotation direction, the first one-way bearing 61 forms a one-way synchronous constraint by locking the rotational freedom of the rotating main shaft 10 relative to the guide inner shaft 30, and the second one-way bearing 62 in a free rotation state releases the rotational freedom of the guide inner shaft 30 relative to the fixed end cover 72, so that the guide inner shaft 30 subject to the one-way synchronous constraint rotates synchronously with the reciprocating inner shaft 20 following the rotating main shaft 10.

[0105] In response to the rotation of the rotating main shaft 10 around the second rotation direction, the second one-way bearing 62 forms a one-way anti-rotation constraint by locking the rotational freedom of the guide inner shaft 30 relative to the fixed end cover 72, and the first one-way bearing 61 in a free rotation state releases the rotational freedom of the rotating main shaft 10 relative to the guide inner shaft 30, so that when the reciprocating inner shaft 20 rotates synchronously with the rotating main shaft 10, the guide inner shaft 30 subject to the one-way anti-rotation constraint is locked on the fixed end cover 72.

[0106] In an embodiment of the present application, if the reciprocating inner shaft 20 is constrained to rotate synchronously with the rotating main shaft 10 in any of the first and second rotation directions, the roller brush assembly also includes a fixed end cover 72 arranged at the second axial end of the rotating main shaft 10, and the clutch mechanism 60 includes a first one-way bearing 61 and a second one-way bearing 62 that have opposite free rotation directions and are sleeved on the guide inner shaft 30 (for example, the constrained shaft segment 32). Then, the guide inner shaft 30 can be coaxially matched with the rotating main shaft 10 through the first one-way bearing 61, and the guide inner shaft 30 can also be coaxially matched with the fixed end cover 72 through the second one-way bearing 62.

[0107] Exemplarily, in an embodiment of the present application, if the reciprocating inner shaft 20 is located in the main shaft inner cavity 100 of the rotating main shaft 10, and the guide inner shaft 30 extends from the main shaft inner cavity 100 to the fixed end cover 72 outside the main shaft inner cavity 100, then the guide shaft section 31 can be located in the main shaft inner cavity 100 of the rotating main shaft 10, and the constraint shaft section 32 can be partially inserted into the main shaft inner cavity 100 of the rotating main shaft 10, that is, the constraint shaft section 32 can include a main shaft constraint section 321 located in the main shaft inner cavity 100, and an end cover constraint section 322 located outside the main shaft inner cavity 100, the main shaft constraint section 321 is coaxially connected to the guide shaft section 31, the first one-way bearing 61 can be sleeved on the main shaft constraint section 321, the end cover constraint section 322 extends to the fixed end cover 72, and the second one-way bearing 62 can be sleeved on the end cover constraint section 322. Thus, the guide inner shaft 30 can be coaxially matched with the rotating main shaft 10 in the main shaft inner cavity 100 through the first one-way bearing 61, and the guide inner shaft 30 can be coaxially matched with the fixed end cover 72 outside the main shaft inner cavity 100 through the second one-way bearing 62.

[0108] Thus, based on the coaxial fit between the guide inner shaft 30 and the rotating main shaft 10 through the first one-way bearing 61 and the coaxial fit between the guide inner shaft 30 and the fixed end cover 72 through the second one-way bearing 62:

[0109] In response to the rotation of the rotating main shaft 10 about the first rotation direction, the first one-way bearing 61 can form a one-way synchronization constraint (Ctr_syn) by locking (e.g., instantly locking) the rotational freedom of the rotating main shaft 10 relative to the guide inner shaft 30, and the second one-way bearing 62 in a free rotation state releases (e.g., instantly releases) the rotational freedom of the guide inner shaft 30 relative to the fixed end cover 72, so that the guide inner shaft 30 subject to the one-way synchronization constraint (Ctr_syn) rotates synchronously with the reciprocating inner shaft 20 following the rotating main shaft 10;

[0110] In response to the rotation of the rotating main shaft 10 around the second rotation direction, the second one-way bearing 62 can form a one-way anti-rotation constraint (Ctr_stp) by locking (for example, instantly locking) the rotational freedom of the guide inner shaft 30 relative to the fixed end cover 72, and the first one-way bearing 61 in a free rotation state releases (for example, instantly releases) the rotational freedom of the rotating main shaft 10 relative to the guide inner shaft 30, so that when the reciprocating inner shaft 20 rotates synchronously with the rotating main shaft 10 (that is, rotates synchronously around the second rotation direction), the guide inner shaft 30 subject to the one-way anti-rotation constraint (Ctr_stp) is locked to the fixed end cover 72.

[0111] Based on an embodiment of the present application, the roller brush assembly may include a rotating main shaft 10 having a cutting mechanism 50, and a reciprocating inner shaft 20 and a guide inner shaft 30 passing through the rotating main shaft 10. The cutting operation of the cutting mechanism 50 can be triggered by the coaxial relative rotation between the reciprocating inner shaft 20 and the guide inner shaft 30. In addition, the roller brush assembly may also include a clutch mechanism 60, which is used to control the coaxial relative rotation between the reciprocating inner shaft 20 and the guide inner shaft 30 according to the rotation direction of the rotating main shaft 10. Among them, based on the formation of differentiated unidirectional constraints on the guide inner shaft 30 in the first rotation direction and the second rotation direction of the rotating main shaft 10 (the unidirectional synchronization constraint is represented by Ctr_syn in Figure 3, and the unidirectional anti-rotation constraint is represented by Ctr_stp in Figure 3), the clutch mechanism 60 can immediately control the coaxial relative rotation between the reciprocating inner shaft 20 and the guide inner shaft 30. Therefore, the starting and stopping of the cutting operation of the cutting mechanism 50 can be implemented without delay control in response to the rotation of the rotating main shaft 10 in the first rotation direction or the second rotation direction without the need for additional operations such as axial movement operations. This enables the roller brush assembly to freely switch between the cutting state and the non-cutting state. When the roller brush assembly is sweeping the floor normally, the cutting assembly 50 stops running and does not perform the cutting action, which solves the problem of high cutting noise during normal use of the conventional cutting roller brush. At the same time, it also solves the problem of ineffective work and power consumption caused by the conventional cutting roller brush constantly cutting.

[0112] In some embodiments of the present application, as shown in Figures 2, 6 and 7, the clutch mechanism 60 also includes a bearing isolation washer 63, which is sleeved on the guide inner shaft 30, and the bearing isolation washer 63 is located between the first one-way bearing 61 and the second one-way bearing 62; and / or, the guide inner shaft 30 has a limiting flange 36, and the limiting flange 36 is located on the side of the first one-way bearing 61 that is away from the second one-way bearing 62 in the axial direction. The clutch mechanism 60 also includes an axial limiting washer 66, which is sleeved on the guide inner shaft 30, and the axial limiting washer 66 is located between the first one-way bearing 61 and the limiting flange 36.

[0113] In the embodiment of the present application, if the clutch mechanism 60 includes a first one-way bearing 61 and a second one-way bearing 62, and the first one-way bearing 61 and the second one-way bearing 62 are arranged adjacent to each other in the axial direction of the rotating main shaft 10, then, to prevent metal rigid friction between the first one-way bearing 61 and the second one-way bearing 62, the clutch mechanism 60 further includes a bearing isolation washer 63 disposed between the first one-way bearing 61 and the second one-way bearing 62 and sleeved on the guide inner shaft 30 (e.g., the restraining shaft section 32). For example, the bearing isolation washer 63 can be made of a non-metallic material.

[0114] In an embodiment of the present application, if the clutch mechanism 60 includes a first one-way bearing 61 and a second one-way bearing 62, the outer periphery of the first one-way bearing 61 can be transmission-fitted with the spindle inner cavity 100 by means such as an interference fit, and the outer periphery of the second one-way bearing 62 can be transmission-fitted with the fixed end cap 72 by means such as an interference fit. Furthermore, the first one-way bearing 61 and the second one-way bearing 62 can both be transmission-fitted with the guide inner shaft 30 (e.g., the constrained shaft section 32 of the guide inner shaft) by means such as a zero-position fit or a clearance fit with minimal clearance. For example, the first one-way bearing 61 and the second one-way bearing 62 can be needle roller bearings, the outer ring of the first one-way bearing 61 can be interference fit with the spindle inner cavity 100, the outer ring of the second one-way bearing 62 can be interference fit with the fixed end cap 72, and the needle rollers of the first one-way bearing 61 and the second one-way bearing 62 can be zero-position fit or a clearance fit with minimal clearance with the guide inner shaft 30 (e.g., the constrained shaft section 32 of the guide inner shaft). In this case, there is a risk that the first one-way bearing 61 and the second one-way bearing 62 may be axially offset in the axial direction of the rotating main shaft 10 .

[0115] In an embodiment of the present application, in order to prevent the first one-way bearing 61 and the second one-way bearing 62 from axially offset in the axial direction of the rotating main shaft 10, the guide inner shaft 30 may have a limiting flange 36 (for example, the limiting flange 36 may be located at the connection position of the guide shaft segment 31 and the constraint shaft segment 32 of the guide inner shaft 30), and the limiting flange 36 is located on the side of the first one-way bearing 61 that is away from the second one-way bearing 62 in the axial direction of the rotating main shaft 10 (that is, the side facing the inside of the main shaft inner cavity 100 in the axial direction), and the limiting flange 36 can prevent the first one-way bearing 61 and the second one-way bearing 62 from offsetting and sliding from the constraint shaft segment 32 of the guide inner shaft 30 to the guide shaft segment 31 in the axial direction of the rotating main shaft 10.

[0116] In an embodiment of the present application, the radial dimension of the limiting flange 36 is small to reduce the rigid friction between the limiting flange 36 and the first one-way bearing 61. The clutch mechanism 60 may also include an axial limiting washer 66 (omitted in Figures 6 to 8), which is sleeved on the guide inner shaft 30 (for example, the constraining shaft segment 32), and the axial limiting washer 66 is located on the side of the first one-way bearing 61 that is away from the second one-way bearing 62 in the axial direction of the rotating main shaft 10 (that is, the side facing the inside of the main shaft inner cavity 100 in the axial direction), that is, the axial limiting washer 66 can be located between the first one-way bearing 61 and the limiting flange 36, so that the axial limiting washer 66 can expand the axial limiting coverage of the limiting flange 36 in the radial direction of the rotating main shaft 10.

[0117] In some embodiments of the present application, as shown in FIG2 and FIG3, the spindle inner cavity 100 includes a first cavity section 100a and a second cavity section 100b that are interconnected in the axial direction, and the inner diameter of the second cavity section 100b is larger than the inner diameter of the first cavity section 100a; the reciprocating inner shaft 20 includes a transmission shaft 21, an inner shaft key surface 23 is located on the transmission shaft 21, the transmission shaft 21 is located in the first cavity section 100a, and the shaft cavity key surface 13 is located on the cavity wall of the first cavity section 100a; the reciprocating inner shaft 20 includes a transmission shaft 21, an inner shaft key surface 23 is located on the transmission shaft 21, and the transmission shaft 21 is located in the first cavity section 100a. The shaft 20 also includes a guide sleeve 22, the outer diameter of which is larger than the outer diameter of the transmission shaft 21. The guide sleeve 22 is located in the second cavity section 100b. The guide sleeve 22 is coaxially sleeved on the guide inner shaft 30 in the second cavity section 100b, and the coaxial cooperation between the guide sleeve 22 and the guide inner shaft 30 is used to: during the period of coaxial relative rotation between the guide inner shaft 30 and the reciprocating inner shaft 20, cause the reciprocating inner shaft 20 to move reciprocatingly axially relative to the rotating main shaft 10.

[0118] In an embodiment of the present application, if the clutch mechanism 60 includes a first one-way bearing 61 and a second one-way bearing 62, then, in addition to providing the shaft cavity key surface 13, no other additional structures may be required in the main shaft cavity 100 of the rotating main shaft 10, and the number of overall component types is greatly reduced. Therefore, the structure of the main shaft cavity 100 of the rotating main shaft 10 can be relatively simple. That is, the main shaft cavity 100 can include a first cavity segment 100a and a second cavity segment 100b that are interconnected in the axial direction, and the inner diameter of the second cavity segment 100b is larger than the inner diameter of the first cavity segment 100a, so that the main shaft cavity 100 can be simplified into a stepped shaft cavity. In this case, the transmission shaft 21 of the reciprocating inner shaft 20 (i.e., the inner shaft key surface 23 and the inner shaft slot 25) can be located in the first cavity section 100a of the main shaft inner cavity 100, the shaft cavity key surface 13 can be located on the cavity wall of the first cavity section 100a, and the driving arm 525 can extend into the first cavity section 100a of the main shaft inner cavity 100 along the radial direction of the rotating main shaft 10; the guide sleeve 22 of the reciprocating inner shaft 20 can be located in the second cavity section 100b of the main shaft inner cavity 100, and the guide sleeve 22 of the reciprocating inner shaft 20 can be coaxially sleeved on the guide inner shaft 30 (for example, the guide shaft section 31) in the second cavity section 100b of the main shaft inner cavity 100; the main shaft constraint section 321 of the constraint shaft section 32 of the guide inner shaft 30, and the first one-way bearing 61 sleeved on the main shaft constraint section 321 can be located in the second cavity section 100b of the main shaft inner cavity 100. Therefore, the structure of the spindle inner cavity 100 of the rotating spindle 10 is simple, which can support the simplification of the structure of the rotating spindle 10 .

[0119] In an embodiment of the present application, in order to avoid providing a bristle planting structure for installing a hoisting brush 43 and a sheet clamping structure for installing a hoisting sheet 45 on the rotating main shaft 10, the hoisting mechanism 40 may include a covering base sleeve 41, which may be fixedly covered on the shaft wall of the rotating main shaft 10, and the covering base sleeve 41 may have an avoidance notch 410, and the cutting mechanism 50 and the guide comb teeth 17 are exposed at the avoidance notch 410, that is, the covering base sleeve 41 of the hoisting mechanism 40 may utilize the avoidance notch 410 to avoid the cutting mechanism 50 and the guide comb teeth 17. In this case, the hoisting brush 43 may be installed on the covering base sleeve 41 (that is, the bristles are planted on the covering base sleeve 41), and / or the hoisting sheet 45 may be integrated into the covering base sleeve 41. Thus, the structure of the rotating main shaft 10 can also be simplified.

[0120] In the embodiment of the present application, the structural simplification of the main shaft inner cavity 100 means that the radial dimension of the main shaft inner cavity 100 can be smaller. Therefore, when the rotating main shaft 10 has the same strength, the main shaft inner cavity 100 with a smaller radial dimension can allow the outer diameter of the rotating main shaft 10 to be smaller. Furthermore, if the radially radiating end of the hoisting brush 43 of the hoisting mechanism 40 is considered to be the contour boundary of the roller brush assembly, then, when the radial dimensions of the contour boundary of the roller brush assembly are the same, the smaller outer diameter of the rotating main shaft 10 can allow the bristles of the hoisting brush 43 to be longer in the radial direction, so as to enhance the hoisting ability of the hoisting mechanism 40 and facilitate the entry of debris into the trash box.

[0121] In some embodiments of the present application, as shown in Figures 2 and 3, the rotating spindle 10 has a first shaft end and a second shaft end opposite in the axial direction, and the roller brush assembly also includes a driving end cover 71 and a fixed end cover 72, the driving end cover 71 is located at the first shaft end of the rotating spindle 10, and the fixed end cover 72 is located at the second shaft end of the rotating spindle 10, external power is applied to the driving end cover 71, and the driving end cover 71 is used to drive the rotating spindle 10 to rotate relative to the fixed end cover 72 in any rotation direction of the first rotation direction and the second rotation direction in response to the external power; the rotating spindle 10 has a first cutting blind area between the cutting mechanism 50 and the driving end cover 71, and a second cutting blind area between the cutting mechanism 50 and the fixed end cover 72; the roller brush assembly also includes a first sheath 710 and a second sheath 720, the first sheath 710 is sleeved in the first cutting blind area, and the second sheath 720 is sleeved in the second cutting blind area, and the first sheath 710 and the second sheath 720 are both stationary relative to the fixed end cover 72.

[0122] The first sheath 710 and the second sheath 720 protrude radially outward relative to the cutting mechanism 50 in the radial direction of the rotating main shaft 10; and / or, the rotating main shaft 10 has a pair of stop ribs 15, and the stop ribs 15 are located at the range boundary of the deployment range of the cutting mechanism 50 in the axial direction, so that the filamentous dirt wrapped around the rotating main shaft is restricted by the pair of stop ribs 15 within the deployment range of the cutting mechanism 50; the axial gap between each of the first sheath 710 and the second sheath 720 and the adjacent stop ribs 15 is covered and blocked by the flexible seal 73.

[0123] In an embodiment of the present application, the rotating spindle 10 may further include a pair of stop ribs 15, and the stop ribs 15 are located at the boundaries of the deployment range of the cutting mechanism 50 in the axial direction of the rotating spindle 10, so that filamentous waste wrapped around the rotating spindle 10 is confined by the pair of stop ribs 15 within the deployment range of the cutting mechanism 50. The deployment range of the cutting mechanism 50 in the axial direction of the rotating spindle 10 can be considered to be the distribution range of the fixed tooth row 510 and the movable tooth row 520 in the axial direction of the rotating spindle 10. In this case, the rotating spindle 10 has a first cutting blind spot between the cutting mechanism 50 and the driving end cover 71, and a second cutting blind spot between the cutting mechanism 50 and the fixed end cover 72, and the filamentous dirt wrapped around the rotating spindle 10 may also escape from the restriction of a pair of stop ribs 15 and be wound around the first cutting blind spot and / or the second cutting blind spot. As a result, the filamentous dirt wound around the first cutting blind spot and / or the second cutting blind spot will generate resistance to the rotation of the rotating spindle 10, thereby causing the driving motor used as a power source to stall.

[0124] In an embodiment of the present application, in order to prevent filamentous dirt from escaping the restriction of the pair of stop ribs 15 and winding around the first cutting blind zone and / or the second cutting blind zone, the roller brush assembly may further include a first sheath 710 and a second sheath 720. The first sheath 710 is sleeved on the first cutting blind zone of the rotating spindle 10 between the cutting mechanism 50 and the driving end cover 71, and the second sheath 720 is sleeved on the second cutting blind zone of the rotating spindle 10 between the cutting mechanism 50 and the fixed end cover 72. In addition, the first sheath 710 and the second sheath 720 are both stationary relative to the fixed end cover 72. Since the stationary first sheath 710 and the second sheath 720 will not guide the filamentous dirt to be entangled during the rotation of the rotating spindle 10, it is possible to prevent the filamentous dirt from being entangled in the first cutting blind zone where the first sheath 710 is located and the second cutting blind zone where the second sheath 720 is located.

[0125] In an embodiment of the present application, the axial gap between each of the first sheath 710 and the second sheath 720 and the adjacent stop rib 15 can be covered and blocked by a flexible seal 73 such as felt to prevent filamentous dirt near the stop rib 15 from being entangled in the above-mentioned axial gap.

[0126] In an embodiment of the present application, the first sheath 710 and the second sheath 720 can protrude radially outward relative to the cutting mechanism 50 in the radial direction of the rotating spindle 10, that is, the first sheath 710 and the second sheath 720 can protrude radially outward relative to the fixed tooth row 510 and the movable tooth row 520 of the cutting mechanism 50 in the radial direction of the rotating spindle 10, so that the deployment range of the cutting mechanism 50 in the axial direction of the rotating spindle 10 can be regarded as being located in the radial concave space between the first sheath 710 and the second sheath 720, thereby being more conducive to preventing filamentous dirt from escaping from the deployment range of the cutting mechanism 50 in the axial direction of the rotating spindle 10.

[0127] In an embodiment of the present application, if the roller brush assembly further includes a first sleeve 710 and a second sleeve 720, then the first sleeve 710 and the second sleeve 720 can both be rigid sleeves, the drive end cover 71 can be a rigid end cover, and the fixed end cover 72 can be made of a flexible material such as soft rubber. In this case, the fixed end cover 72 can partially cover the second sleeve 720, the external anti-rotation constraint can be applied to the second sleeve 720 through the fixed end cover 72, and the outer periphery of the second one-way bearing 62 and the fixed end cover 72 can be driven by a method such as an interference fit. The fit can refer to: the outer periphery of the second one-way bearing 62 and the second sleeve 720 are driven. For example, the fixed end cover 72 can include an end cover peripheral wall 722 and an end cover cover plate 721, wherein the end cover peripheral wall 722 can partially cover the outer peripheral wall of the second sleeve 720, and the end cover cover plate 721 can partially block the outer end surface of the second sleeve 720 facing away from the cutting mechanism 50. That is, if the roller brush assembly further includes a first sheath 710 and a second sheath 720 , and the fixed end cap 72 can be made of a flexible material such as soft rubber, then the fixed end cap 72 can be regarded as a buffer layer between the constraint source of the external rigid constraint and the second sheath 720 .

[0128] FIG9 a is a schematic diagram of a partial structure of a sweeping robot in an embodiment of the present application; FIG9 b is a schematic diagram of the structure of FIG9 a without the roller brush mounting frame; and FIG9 c is a schematic diagram of the overall structure of the sweeping robot in an embodiment of the present application. Referring to FIG9 a to FIG9 c , in an embodiment of the present application, a sweeping robot is further provided, which may include a mobile chassis 80, a drive motor (not shown) supported by the mobile chassis 80, and a roller brush assembly 90 as described in the aforementioned embodiment, wherein the mobile chassis 80 may have a chassis opening 800, and the roller brush assembly 90 may be installed at the chassis opening 800 so that at least the hoisting mechanism 40 can partially protrude from the chassis opening 800 below the mobile chassis 80, and the drive motor can be used to generate the external power required to drive the rotating main shaft 10 of the roller brush assembly 90 to rotate, that is, the motor output shaft of the drive motor can be transmission-connected to the rotating main shaft 10 (e.g., the drive end cover 71) via a transmission mechanism such as a reducer. When the roller brush assembly 90 is installed at the chassis opening 800 , the fixed end cap 72 of the rotating main shaft 10 of the roller brush assembly 90 is restrained by external anti-rotation.

[0129] Figure 10 illustrates the assembly structure of the roller brush assembly and roller brush mounting frame of the sweeping robot in an embodiment of the present application. Referring to Figures 9a to 9c in conjunction with Figure 10, in this embodiment of the present application, the roller brush assembly 90 described in the previous embodiments can be mounted in the chassis opening 800 of the mobile chassis 80 via the roller brush mounting frame 85. Furthermore, the roller brush mounting frame 85 can apply an external anti-rotation constraint to the fixed end cap 72 of the rotating spindle 10 of the roller brush assembly 90. For example, the roller brush mounting frame 85 can include a snap mechanism 850 for facilitating assembly and disassembly within the chassis opening 800 of the mobile chassis 80.

[0130] In the embodiment of the present application, when the roller brush assembly 90 needs to be installed on the mobile chassis 80, the roller brush assembly 90 described in the above embodiment can be pre-installed on the roller brush mounting frame 85, and then the roller brush mounting frame 85 with the roller brush assembly 90 pre-installed can be fixedly installed in the chassis opening 800 of the mobile chassis 80. When the roller brush assembly 90 needs to be removed from the mobile chassis 80, the roller brush mounting frame 85 with the roller brush assembly 90 installed can be first removed from the chassis opening 800 of the mobile chassis 80, and then the roller brush assembly 90 described in the above embodiment can be removed from the roller brush mounting frame 85. As a result, the assembly and disassembly of the roller brush assembly 90 on the mobile chassis 80 is not limited by the narrow space at the chassis opening 800, and the assembly and disassembly of the roller brush assembly 90 on the mobile chassis 80 can be facilitated.

[0131] In the embodiment of the present application, the driving motor may also be installed on the roller brush mounting frame 85 , and the driving motor may be supported on the movable chassis 80 through the roller brush mounting frame 85 .

[0132] In an embodiment of the present application, the sweeping robot may further include a suction mechanism and a dust collecting component, wherein the suction component may generate a suction airflow flowing from the roller brush assembly 90 to the dust collecting component, so that discrete dirt (such as dust, food crumbs, etc.) rolled into the chassis opening 800 by the rolling mechanism 40 of the roller brush assembly 90 and debris formed by cutting filamentous dirt (such as hair, etc.) by the cutting mechanism 50 of the roller brush assembly 90 can be sucked into the dust collecting component.

[0133] In an embodiment of the present application, the sweeping robot may further include a navigation component and an obstacle avoidance component, both of which may be used to control the mobile chassis 80, wherein the control of the mobile chassis 80 based on the navigation component may enable the sweeping robot to complete the cleaning task along a specified route, and the control of the mobile chassis 80 based on the obstacle avoidance component may enable the sweeping robot to automatically avoid obstacles while completing the cleaning task.

[0134] In an embodiment of the present application, the rotating main shaft 10 of the roller brush assembly 90 can be driven to rotate about a first rotation direction during the process of the sweeping robot completing the cleaning task, that is, the cutting operation of the cutting mechanism 50 stops during the process of the sweeping robot completing the cleaning task; the rotating main shaft 10 of the roller brush assembly 90 can be driven to rotate about a second rotation direction during the self-cleaning period after the sweeping robot completes the cleaning task, that is, the cutting operation of the cutting mechanism 50 is enabled during the self-cleaning process after the sweeping robot completes the cleaning task, and, generally, if the sweeping robot completes a cleaning task without being interrupted, the time taken for the self-cleaning process of the sweeping robot is shorter than the single task time taken for the sweeping robot to complete a cleaning task.

[0135] Referring to Figure 9c, the sweeping robot provided in this application also includes: two walking wheels 81 for driving the sweeping robot to move, a steering wheel 82 for providing guidance for the sweeping robot, a side sweeping brush 83 for auxiliary cleaning, and a water storage chamber 84 for supplying water to the roller brush assembly 90.

[0136] In this embodiment, referring to Figure 9c, the two running wheels 81 are respectively located on both sides of the sweeping robot, which can drive the sweeping robot to move. The two running wheels 81 are differential wheels, and the two running wheels 81 can drive the sweeping robot to turn through differential rotation. The steering wheel 82 located on the central axis of the line connecting the two running wheels 81 can be a universal wheel. The steering wheel 82 can provide guidance for the straight-line walking and turning process of the sweeping robot during the walking process of the sweeping robot. At the same time, during the walking process of the sweeping robot, the side sweeping brush 83 rotates to achieve auxiliary cleaning. During the cleaning process of the roller brush assembly 90, the water storage chamber 84 can supply water to the hoisting mechanism 40 to keep the hoisting mechanism 40 in a moist state, thereby improving the cleaning efficiency.

[0137] In summary, the roller brush assembly and sweeping robot provided by this application have the following beneficial effects:

[0138] (1) The roller brush assembly in the present application can be freely switched between a cutting state and a non-cutting state.

[0139] (2) The structures of the reciprocating inner shaft 20 and the guide inner shaft 30 are more stable.

[0140] (3) Clutch cutting can be achieved even in the case of low-speed reversal, and high speed is not required to achieve clutch cutting. In other words, the roller brush assembly provided by the present application has no difference in cutting state between high speed and low speed under the same rotation direction, and always maintains the same cutting state. In addition, clutch cutting can be achieved by reverse rotation, so that the roller brush assembly can switch between the cutting state and the non-cutting state without delay. In this way, the roller brush assembly and the sweeping robot have a simple structure and more reliable operation.

[0141] (4) The stationary first sheath 710 and the second sheath 720 will not guide the filamentary dirt to be entangled during the rotation of the rotating spindle 10. Therefore, it is possible to prevent the filamentary dirt from being entangled in the first cutting blind area where the first sheath 710 is located and the second cutting blind area where the second sheath 720 is located.

[0142] (5) In addition to the shaft cavity key surface 13, no other additional structures are required in the main shaft inner cavity 100 of the rotating main shaft 10, and the number of overall component types is greatly reduced.

[0143] (6) When the radial dimensions of the contour boundaries of the roller brush assembly are the same, a smaller outer diameter of the rotating main shaft 10 can allow the bristles of the rolling brush 43 to be longer in the radial direction, thereby improving the rolling capacity of the rolling mechanism 40 and facilitating the entry of debris into the trash box.

[0144] (7) When the roller brush assembly is sweeping the floor normally, the cutting assembly 50 stops running and does not perform cutting action, which solves the problem of high cutting noise during normal use of the conventional cutting roller brush. At the same time, it also solves the problem of ineffective work and power consumption caused by the conventional cutting roller brush cutting all the time.

[0145] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A roller brush assembly for a sweeping robot, characterized in that: include: A rotating main shaft (10), the rotating main shaft (10) is used to drive the hoisting mechanism (40) and the cutting mechanism (50) to rotate in a first rotation direction or a second rotation direction in response to external power; a reciprocating inner shaft (20), the reciprocating inner shaft (20) being disposed through the rotating main shaft (10), and the reciprocating axial movement of the reciprocating inner shaft (20) relative to the rotating main shaft (10) in the axial direction of the rotating main shaft (10) is used to trigger the cutting mechanism (50) to perform a cutting operation; A guide inner shaft (30), the guide inner shaft (30) being inserted into the rotating main shaft (10), wherein the coaxial relative rotation between the guide inner shaft (30) and the reciprocating inner shaft (20) is used to induce the reciprocating axial movement of the reciprocating inner shaft (20) relative to the rotating main shaft (10); A clutch mechanism (60), the clutch mechanism (60) is used to form the following unidirectional constraints on the guide inner shaft (30) in the first rotation direction and the second rotation direction respectively; a one-way synchronization constraint that takes effect in response to the rotation of the rotating main shaft (10) about the first rotation direction, the one-way synchronization constraint being used to constrain the guide inner shaft (30) to rotate synchronously with the reciprocating inner shaft (20) to prohibit coaxial relative rotation between the guide inner shaft (30) and the reciprocating inner shaft (20); A one-way anti-rotation constraint is effective in response to the rotation of the rotating main shaft (10) around the second rotation direction, and the one-way anti-rotation constraint is used to prevent the guide inner shaft (30) and the reciprocating inner shaft (20) from rotating synchronously, so as to enable coaxial relative rotation between the guide inner shaft (30) and the reciprocating inner shaft (20).

2. The roller brush assembly according to claim 1, characterized in that: The clutch mechanism (60) comprises a first one-way bearing (61) and a second one-way bearing (62), wherein the first one-way bearing (61) and the second one-way bearing (62) have opposite free rotation directions, and: In response to the rotation of the rotating main shaft (10) around the first rotation direction, the first one-way bearing (61) generates the one-way synchronous constraint, and the second one-way bearing (62) is in a free rotation state; In response to the rotation of the rotating main shaft (10) around the second rotating direction, the second one-way bearing (62) generates the one-way anti-rotation constraint, and the first one-way bearing (61) is in a free-rotation state.

3. The roller brush assembly according to claim 2, characterized in that: The reciprocating inner shaft (20) is used to rotate synchronously with the rotating main shaft (10) in any of the first rotation direction and the second rotation direction, the rotating main shaft (10) has a first shaft end for receiving the external power, and a second shaft end opposite to the first shaft end, the roller brush assembly further includes a fixed end cap (72) arranged at the second shaft end of the rotating main shaft (10), and the rotating main shaft (10) is used to rotate relative to the fixed end cap (72) in the first rotation direction or the second rotation direction in response to the external power; The guide inner shaft (30) is coaxially matched with the rotating main shaft (10) through the first one-way bearing (61), the guide inner shaft (30) is coaxially matched with the fixed end cover (72) through the second one-way bearing (62), and: In response to the rotation of the rotating main shaft (10) about the first rotation direction, the first one-way bearing (61) forms the one-way synchronous constraint by locking the rotational freedom of the rotating main shaft (10) relative to the guide inner shaft (30), and the second one-way bearing (62) in a free rotation state releases the rotational freedom of the guide inner shaft (30) relative to the fixed end cover (72), so that the guide inner shaft (30) subject to the one-way synchronous constraint rotates synchronously with the reciprocating inner shaft (20) following the rotating main shaft (10); In response to the rotation of the rotating main shaft (10) around the second rotation direction, the second one-way bearing (62) forms the one-way anti-rotation constraint by locking the rotational freedom of the guide inner shaft (30) relative to the fixed end cover (72), and the first one-way bearing (61) in a free rotation state releases the rotational freedom of the rotating main shaft (10) relative to the guide inner shaft (30), so that when the reciprocating inner shaft (20) rotates synchronously with the rotating main shaft (10), the guide inner shaft (30) subject to the one-way anti-rotation constraint is locked on the fixed end cover (72).

4. The roller brush assembly according to claim 2, characterized in that: The clutch mechanism (60) further includes a bearing isolation washer (63), the bearing isolation washer (63) being sleeved on the guide inner shaft (30), and the bearing isolation washer (63) being located between the first one-way bearing (61) and the second one-way bearing (62); and / or, The guide inner shaft (30) has a limiting flange (36), and the limiting flange (36) is located on the side of the first one-way bearing (61) facing away from the second one-way bearing (62) in the axial direction. The clutch mechanism (60) also includes an axial limiting washer (66), and the axial limiting washer (66) is sleeved on the guide inner shaft (30), and the axial limiting washer (66) is located between the first one-way bearing (61) and the limiting flange (36).

5. The roller brush assembly according to claim 1, characterized in that: The reciprocating inner shaft (20) is located in the spindle inner cavity (100) of the rotating spindle (10), the cavity wall of the spindle inner cavity (100) has a shaft cavity key surface (13), the reciprocating inner shaft (20) has an inner shaft key surface (23), and the limiting fit between the shaft cavity key surface (13) and the inner shaft key surface (23) constrains the reciprocating inner shaft (20) to rotate synchronously with the rotating spindle (10) in any rotation direction of the first rotation direction and the second rotation direction; The one-way synchronous constraint is used to constrain the guiding inner shaft (30) to rotate synchronously with the reciprocating inner shaft (20) and the rotating main shaft (10).

6. The roller brush assembly according to claim 5, characterized in that: The spindle inner cavity (100) comprises a first cavity section (100a) and a second cavity section (100b) which are interconnected in the axial direction, and the inner diameter of the second cavity section (100b) is larger than the inner diameter of the first cavity section (100a); The reciprocating inner shaft (20) comprises a transmission shaft (21), the inner shaft key surface (23) is located on the transmission shaft (21), the transmission shaft (21) is located in the first cavity section (100a), and the shaft cavity key surface (13) is located on the cavity wall of the first cavity section (100a); The reciprocating inner shaft (20) further comprises a guide sleeve (22), the outer diameter of the guide sleeve (22) being larger than the outer diameter of the transmission shaft (21), the guide sleeve (22) being located in the second cavity section (100b), the guide sleeve (22) being coaxially sleeved on the guide inner shaft (30) in the second cavity section (100b), and the coaxial fit between the guide sleeve (22) and the guide inner shaft (30) being used to induce reciprocating axial movement of the reciprocating inner shaft (20) relative to the rotating main shaft (10) during a period of coaxial relative rotation between the guide inner shaft (30) and the reciprocating inner shaft (20).

7. The roller brush assembly according to claim 6, characterized in that: The guide inner shaft (30) has an annular guide groove (310), and the axial direction of the annular guide groove (310) is tilted relative to the axial direction; the guide sleeve (22) has a ball receiving hole (220), and the ball receiving hole (220) receives a ball (225); wherein the ball (225) and the annular guide groove (310) are in rolling engagement, and during the period of coaxial relative rotation between the guide inner shaft (30) and the reciprocating inner shaft (20), the motion trajectory of the ball (225) along the annular guide groove (310) around the guide inner shaft (30) has a reciprocating axial offset in the axial direction, and the reciprocating axial offset is used to induce the reciprocating axial movement of the reciprocating inner shaft (20) relative to the rotating main shaft (10); and / or, The cutting mechanism (50) includes a fixed tooth member (51) and a movable tooth member (52), and the cutting operation of the cutting mechanism (50) includes the reciprocating axial movement of the movable tooth member (52) relative to the fixed tooth member (51) in the axial direction; the reciprocating inner shaft (20) has an inner shaft slot (25), the movable tooth member (52) has a driving insert arm (525), the driving insert arm (525) extends into the first cavity section (100a) along the radial direction of the rotating main shaft (10), and the driving The insert arm (525) is fixedly inserted into the inner shaft slot (25) so that the reciprocating inner shaft (20) moves reciprocatingly axially relative to the rotating main shaft (10) in the axial direction of the rotating main shaft (10), thereby causing the movable tooth member (52) to move reciprocatingly axially relative to the fixed tooth member (51) in the axial direction; the inner shaft slot (25) is located on the transmission shaft (21), and the inner shaft slot (25) passes through the transmission shaft (21) in the radial direction perpendicular to the inner shaft key surface (23).

8. The roller brush assembly according to claim 1, characterized in that: The rotating main shaft (10) has a first shaft end and a second shaft end opposite to each other in the axial direction, and the roller brush assembly further comprises a driving end cover (71) and a fixed end cover (72), wherein the driving end cover (71) is located at the first shaft end of the rotating main shaft (10), and the fixed end cover (72) is located at the second shaft end of the rotating main shaft (10), and the external power is applied to the driving end cover (71), and the driving end cover (71) is used for driving the rotating main shaft (10) to rotate relative to the fixed end cover (72) in any rotation direction of the first rotation direction and the second rotation direction in response to the external power; The rotating spindle (10) has a first cutting blind area between the cutting mechanism (50) and the driving end cover (71), and a second cutting blind area between the cutting mechanism (50) and the fixed end cover (72); The roller brush assembly further comprises a first sheath (710) and a second sheath (720), wherein the first sheath (710) is sleeved on the first cutting blind area, and the second sheath (720) is sleeved on the second cutting blind area, and both the first sheath (710) and the second sheath (720) are stationary relative to the fixed end cover (72).

9. The roller brush assembly according to claim 8, characterized in that: The first sheath (710) and the second sheath (720) protrude radially outward relative to the cutting mechanism (50) in the radial direction of the rotating spindle (10); and / or, The rotating main shaft (10) has a pair of stop ribs (15), and the stop ribs (15) are located at the range boundary of the deployment range of the cutting mechanism (50) in the axial direction, so that the filamentous dirt wrapped around the rotating main shaft is restricted by the pair of stop ribs (15) within the deployment range of the cutting mechanism (50); the axial gap between each of the first sheath (710) and the second sheath (720) and the adjacent stop ribs (15) is covered and blocked by a flexible seal (73).

10. A sweeping robot, characterized in that: It comprises a mobile chassis (80), a driving motor carried on the mobile chassis (80), and a roller brush assembly (90) according to any one of claims 1 to 9, wherein the mobile chassis (80) has a chassis opening (800), the roller brush assembly is installed at the chassis opening (800), and the driving motor is used to generate the external power.

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