Vacuum cleaner

Abstract

A vacuum cleaner includes a cleaner body including a motor configured to generate a suction force and a foreign matter collection chamber, and a suction head connected to the cleaner body. The suction head can include a roller brush, a unidirectional roller disposed forward of the roller brush, and a housing having a suction port. The roller brush and the unidirectional roller can be configured such that, when the suction head moves forward on a surface to be cleaned, the roller brush and the unidirectional roller rotate such that foreign matter on the surface is suctioned by the suction force into the housing through the suction port for being directed to the foreign matter collection chamber, and when the suction head moves backward on the surface, rotation of the unidirectional roller is constrained to prevent the foreign matter suctioned into the housing from being discharged outside of the housing of the suction head through the suction port.

Description

Technical Field

[0001] This disclosure relates to a vacuum cleaner having a suction head equipped with a rotating roller brush, and more specifically, to a suction head having a structure to prevent foreign matter from separating again. Background Technology

[0002] Generally, a vacuum cleaner is a household appliance that performs cleaning and includes a suction generating device (motor) that generates suction force, a suction head that uses the suction force of the suction generating device (motor) to draw air and clean foreign objects from surfaces, and a foreign object collection chamber that separates and collects foreign objects from the air drawn in by the suction head.

[0003] The suction head may include a housing and a roller brush. The housing has a suction port, and the roller brush cleans the surface to guide foreign objects on the surface to be effectively suctioned into the suction port. The roller brush may be rotatably configured and connected to a driver.

[0004] As the suction head moves forward, the foreign objects drawn into it are completely sucked into the foreign object collection chamber of the cleaner, and therefore the foreign objects do not separate back to the outside of the suction head.

[0005] On the other hand, as the suction head moves backward, depending on the foreign object's position within the suction head during the cleaning process, it may be separated and returned to the outside of the suction head, potentially hindering the cleaning process. This cleaning condition may occur more frequently when the size of the foreign object to be suctioned becomes larger. Summary of the Invention

[0006] Technical problems to be solved

[0007] This disclosure aims to provide a vacuum cleaner having a structure that prevents foreign matter introduced into the suction head from separating and returning to the outside of the suction head as the suction head moves forward or backward.

[0008] This disclosure also aims to provide a vacuum cleaner that is easy to maintain, replace, and clean because it can separate the unidirectional roller that performs the foreign matter reseparation prevention function from the suction head.

[0009] Technical solution

[0010] According to embodiments of this disclosure, a vacuum cleaner may include: a cleaner body including a motor and a foreign matter collection chamber, the motor being configured to generate suction force; and a suction head connected to the cleaner body. The suction head may include: a roller brush; a one-way roller disposed in front of the roller brush; and a housing having a suction port. The roller brush and the one-way roller may be configured such that: when the suction head moves forward on a surface to be cleaned, the roller brush and the one-way roller rotate such that foreign matter on the surface is drawn into the housing through the suction port by the suction force to be guided to the foreign matter collection chamber; and when the suction head moves backward on the surface, the rotation of the one-way roller is constrained to prevent the foreign matter drawn into the housing from being discharged outside the housing of the suction head through the suction port.

[0011] According to an embodiment of the present disclosure, the unidirectional roller includes a roller shaft and a roller body, the roller body being fixed to the outer peripheral surface of the roller shaft, and the roller body being configured such that when the suction head is on the surface, the roller body contacts at least some of the foreign objects on the surface below the suction head.

[0012] According to embodiments of the present disclosure, the vacuum cleaner may further include a one-way clutch bearing connected to at least one end of the roller shaft and configured to support the at least one end of the roller shaft.

[0013] According to an embodiment of this disclosure, the one-way clutch bearing locks the roller shaft during the forward movement of the suction head, causing the roller shaft to rotate, and the one-way clutch bearing unlocks the roller shaft during the backward movement of the suction head, causing the rotation of the roller shaft to be constrained or limited.

[0014] According to an embodiment of the present disclosure, the unidirectional roller further includes a foreign object contactor disposed on the outer peripheral surface of the roller body and comprising a velvet-like material configured to contact at least one of the foreign objects on the surface below the suction head when the suction head is on the surface.

[0015] According to embodiments of this disclosure, the vacuum cleaner may further include a wheel module disposed at at least one end of the one-way roller, the roller shaft being connected to the one-way clutch bearing at the at least one end of the one-way roller, and the wheel module being configured to support the at least one end of the roller shaft via the one-way clutch bearing.

[0016] According to an embodiment of this disclosure, the wheel module includes: a wheel frame, the one-way clutch bearing being fixed to the wheel frame on an inner surface of the wheel frame; a wheel axle, the wheel axle protruding from an outer surface of the wheel frame and configured as a rotation axis of the wheel frame; and a wheel bearing supporting the wheel axle.

[0017] According to embodiments of this disclosure, when the suction head moves forward, the wheel module and the one-way roller rotate, and when the suction head moves backward, the movement of the one-way roller is constrained and the wheel module rotates.

[0018] According to an embodiment of the present disclosure, the housing includes a roller seat, in which the unidirectional roller is disposed; the inner peripheral surface of the roller seat is shaped such that the upper outer peripheral surface of the unidirectional roller contacts the unidirectional roller, so as to provide friction between the inner peripheral surface of the roller seat and the upper outer peripheral surface of the unidirectional roller.

[0019] According to embodiments of this disclosure, the housing may further include: a wheel seat formed on one side of the roller seat and accommodating the wheel module; and a wheel bearing seat formed on the outer side of the wheel seat, wherein the wheel bearing is disposed in the wheel bearing seat.

[0020] According to an embodiment of the present disclosure, the wheel bearing housing includes an opening facing the bottom surface of the housing, and the vacuum cleaner further includes a support hook configured to close the opening and support the wheel bearing disposed in the wheel bearing housing. The support hook has one end rotatably connected to the housing and the other end connected to the housing to support the wheel bearing.

[0021] According to an embodiment of the present disclosure, the wheel frame includes a wheel frame groove formed in the inner surface of the wheel frame, such that the one-way clutch bearing is fixedly inserted into the wheel frame groove.

[0022] According to an embodiment of this disclosure, the diameter of the wheel module is larger than the diameter of the unidirectional roller.

[0023] According to embodiments of this disclosure, the vacuum cleaner may include a plurality of wheel modules. At least one of the plurality of wheel modules further includes an outer cover member, the outer cover member being fixed to and surrounding the outer peripheral surface of the wheel frame of the wheel module.

[0024] According to embodiments of the present disclosure, the outer cover member is configured such that it contacts the surface when the suction head is on the surface, and the outer cover member is formed of a rubber material to increase the frictional force of friction with the surface.

[0025] Another embodiment of this disclosure provides a suction head for a vacuum cleaner, the suction head comprising: a housing having a suction port; a roller brush rotatably mounted inside the housing such that foreign matter on a cleaning surface is suctioned into the housing through the suction port; a one-way roller disposed in front of the roller brush and mounted in a roller seat formed inside the housing for rotation about a roller shaft; and a wheel module having one side of a one-way clutch bearing fixed to one end supporting the roller shaft, wherein the one-way roller is configured to be in close contact with the inner circumferential surface of the roller seat such that the one-way roller rubs against the roller seat, and the suction head locks the roller shaft based on forward movement of the suction head and unlocks the roller shaft based on backward movement of the suction head.

[0026] The housing may include a roller seat in which the unidirectional roller is disposed; and the inner circumferential surface of the roller seat may be configured to correspond to the upper outer circumferential surface of the unidirectional roller so as to be in close contact with the unidirectional roller, both the wheel module and the unidirectional roller may rotate based on the forward movement of the suction head; and based on the rearward movement of the suction head, the unidirectional roller may be fixed and only the wheel module may rotate.

[0027] The wheel module may include: a wheel frame, wherein the one-way clutch bearing is fixed to the wheel frame on one side surface; a wheel axle, which protrudes from the other side surface of the wheel frame and is configured as the rotation axis of the wheel frame; and a wheel bearing that supports the wheel axle.

[0028] The housing may further include: a wheel seat formed on one side of the roller seat and accommodating the wheel module; and a wheel bearing seat formed on one side of the wheel seat, wherein the wheel bearing is disposed in the wheel bearing seat.

[0029] The wheel bearing housing may include an opening facing the bottom surface of the housing. The vacuum cleaner may also include a support hook that closes the opening, supports the wheel bearing housed in the wheel bearing housing, and has one end rotatably connected to the housing and the other end fixedly hooked to the housing.

[0030] Beneficial effects

[0031] According to one aspect of this disclosure, when the suction head moves forward or backward, it can prevent foreign matter introduced into the suction head from being separated to the outside of the suction head.

[0032] According to another aspect of this disclosure, the unidirectional roller that performs the foreign matter reseparation prevention function can be separated from the suction head, thereby making it easy to perform maintenance, replacement or cleaning of the vacuum cleaner. Attached Figure Description

[0033] Figure 1 This is a view illustrating a vacuum cleaner according to an embodiment of the present disclosure.

[0034] Figure 2 This is a perspective view of the suction head of a vacuum cleaner according to an embodiment of the present disclosure.

[0035] Figure 3 This is an exploded view of the suction head of a vacuum cleaner according to an embodiment of the present disclosure.

[0036] Figure 4 This is a bottom view of the suction head of a vacuum cleaner according to an embodiment of the present disclosure.

[0037] Figure 5 When viewed from the left, along Figure 4 A sectional view of line AA.

[0038] Figure 6 An exploded perspective view of the unidirectional roller of a vacuum cleaner according to an embodiment of the present disclosure, as well as a perspective view of the wheel module and the support hook, are shown.

[0039] Figure 7 This is an exploded perspective view of the wheel module of a vacuum cleaner according to an embodiment of the present disclosure.

[0040] Figure 8 The diagram illustrates the effect when viewed from another direction. Figure 7 An exploded perspective view.

[0041] Figure 9 When viewed from the left, along Figure 4 A sectional view of line BB.

[0042] Figure 10 When viewed from the left, along Figure 8 A sectional view of the line FF.

[0043] Figure 11 This is a perspective view illustrating the bottom surface of the lower housing of the suction head of a vacuum cleaner according to an embodiment of the present disclosure.

[0044] Figure 12 This is a bottom view of the lower housing of the suction head of a vacuum cleaner according to an embodiment of the present disclosure.

[0045] Figure 13 When viewed from the left, along Figure 4 A sectional view of line CC.

[0046] Figure 14 yes Figure 5 A portion of the cross-sectional view is used to illustrate the operation process when the suction head of the vacuum cleaner according to an embodiment of the present disclosure moves forward.

[0047] Figure 15 yes Figure 5 A portion of the cross-sectional view is used to illustrate the operation process when the suction head of the vacuum cleaner according to an embodiment of the present disclosure moves backward. Detailed Implementation

[0048] The embodiments disclosed in this specification and the constructions illustrated in the accompanying drawings are merely exemplary embodiments of this disclosure, and various modifications may be made at the time of filing this application to replace the embodiments and drawings of this specification.

[0049] Furthermore, the same reference numerals or symbols presented in each of the accompanying drawings in this specification indicate parts or components that perform substantially the same function.

[0050] Furthermore, the terminology used in this specification is for descriptive purposes only and is not intended to limit or constrain this disclosure. Singular expressions include plural expressions unless explicitly indicated by the context. In this specification, terms such as “comprising” or “having” are intended to indicate the presence of the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and do not exclude the prior presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0051] Furthermore, in this specification, terms including serial numbers such as "first" and "second" may be used to describe various different components, but these components are not limited by the terms described above, and these terms are only used to distinguish one component from other components. For example, without departing from the scope of this disclosure, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component. The term "and / or" includes a combination of multiple related listed items or any one of one or more related listed items.

[0052] refer to Figure 2 and Figure 3 The term “forward” as used in the following description is defined in the direction along which the suction head 100 moves forward, and “backward,” “upward,” “downward,” and “left / right” are defined based on the term “forward.”

[0053] Meanwhile, terms such as “front,” “rear,” “upper,” and “lower” used in the following description are defined based on the accompanying drawings, and the shape and position of the components are not limited by these terms.

[0054] In the following description, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0055] Figure 1 This is a view illustrating a vacuum cleaner according to an embodiment of the present disclosure. Figure 2 This is a perspective view of the suction head of a vacuum cleaner according to an embodiment of the present disclosure. Figure 3 This is an exploded view of the suction head of a vacuum cleaner according to an embodiment of the present disclosure. Figure 4 This is a bottom view of the suction head of a vacuum cleaner according to an embodiment of the present disclosure. Figure 5 When viewed from the left, along Figure 4 A sectional view of line AA.

[0056] refer to Figure 1 The vacuum cleaner 1 may include a cleaner body 10, a suction head 100, and an extension tube 15 connecting the cleaner body 10 and the suction head 100.

[0057] The cleaner body 10 may include: a motor 11, which is a suction generating device for generating suction force; a foreign matter collection chamber 12, which separates foreign matter D from the suctioned air and collects the foreign matter D; a handle 13; and a battery 14, which can supply power to the motor 11.

[0058] Motor 11 is used to convert electrical power into mechanical rotational force. A fan (not shown) can be connected to and rotated by motor 11. The foreign matter collection chamber 12 can collect foreign matter D by a cyclone separation method using centrifugal force to separate foreign matter D, or by a dust bag method using a filter bag to separate foreign matter D. The air that has passed through the foreign matter collection chamber 12 and removed foreign matter D can be discharged to the outside of the cleaner body 10.

[0059] The extension tube 15 can be formed from a tube or flexible hose with a predetermined rigidity. The extension tube 15 can transfer the suction force generated by the motor 11 to the suction head 100 and guide the air and foreign matter D sucked through the suction head 100 to the cleaner body 10.

[0060] The suction head 100 can suction air and foreign matter D from the clean surface while in close contact with it. Specifically, as the suction head 100 moves forward, it can suction foreign matter D dispersed 100F in front of it into housings 111, 112L, 112R, and 113. The suction head 100 can be rotatably connected to the extension tube 15.

[0061] refer to Figures 2 to 5The suction head 100 may include: housings 111, 112L, 112R and 113 forming a suction port 100B between these housings 111, 112L, 112R and 113; a roller brush 200 that rotates to effectively suction foreign matter D through the suction port 100B into the housings 111, 112L, 112R and 113; and a connector 16 that connects the housings 111, 112L, 112R and 113 and the extension tube 15.

[0062] The suction head 100 may also include a unidirectional roller 300 disposed in front of the roller brush 200. The suction head 100 may also include a plurality of wheel modules 500 disposed at both ends of the unidirectional roller 300 and assisting in the forward / backward movement of the suction head 100.

[0063] The suction head 100 may also include an auxiliary wheel 600, which, together with the wheel module 500, assists in the forward / reverse movement of the suction head 100. The auxiliary wheel 600 may be configured to be rotated via an auxiliary wheel shaft 610 fixed to the housing (specifically, the lower housing 113).

[0064] refer to Figure 4 and Figure 11 The suction head 100 can be supported by the wheel module 500 arranged in front of the roller brush 200 and the auxiliary wheel 600 arranged behind the roller brush 200. Figure 4 The diagram illustrates a structure in which the suction head 100 is supported at three points by multiple wheel modules 500 and auxiliary wheels 600, but the number of wheel modules 500 and auxiliary wheels 600 is not limited to this.

[0065] Housings 111, 112L, 112R, and 113 can be formed by assembling an upper housing 111, a lower housing 113, a left side cover or housing 112L, and a right side cover or housing 112R. The bottom surface of the lower housing 113 is formed in an open shape to provide a suction port 100B. In the following description, the term "housing" may be used as the term referring to the lower housing 113.

[0066] A suction port 100B may be formed in the lower housing 113. Air and foreign matter D drawn into housings 111, 112L, 112R, and 113 through the suction port 100B may be transferred to the extension tube 15 via connector 16. The foreign matter D may be collected in the foreign matter collection chamber 12 via the extension tube.

[0067] refer to Figure 3 and Figure 4In the lower housing 113, the suction port 100B can be formed to extend along the length direction of the housing. The connector 16 can be formed at the center of the housings 111, 112L, 112R and 113 along the length direction 110.

[0068] A connection port (not shown) for connection to connector 16 may be formed in the upper housing 111. A foreign matter removal pad (not shown) may be provided on the inner circumferential surface (not shown) of the upper housing 111.

[0069] The roller brush 200 can be rotatably disposed inside housings 111, 112L, 112R, and 113. Specifically, the roller brush 200 can be rotatably disposed in the lower housing 113. Roller brush bearings 220 can be provided at both ends of the rotation axis of the roller brush 200 (see...). Figure 3 The roller brush bearing 220 assists in the rotational movement of the roller brush 200.

[0070] A roller brush slot can be provided in the lower housing 113, allowing the roller brush 200 to be rotatably mounted on the roller brush slot. The roller brush slot can be circular to correspond to the shapes of the two sides of the roller brush 200. However, the shape of the roller brush slot is not limited to this, and the roller brush slot can be formed in various different shapes in which the roller brush 200 can be rotatably mounted inside the lower housing 113, i.e., inside housings 111, 112L, 112R, and 113.

[0071] The left cover 112L and the right cover 112R can be attached to the two side surfaces of the lower housing 113. Specifically, the left cover 112L and the right cover 112R can be arranged on the two side surfaces of the roller brush slot.

[0072] The suction head 100 may include a driver (not shown) for providing rotational force to rotate the roller brush 200.

[0073] The roller brush 200 may include a cylindrical roller body and a brush 210 disposed on the outer peripheral surface of the roller body for cleaning the surface and dispersing foreign matter D. The brush 210 may be fixedly inserted into a spiral mounting groove formed in the outer peripheral surface of the roller body of the roller brush 200 so as to be fixed to the outer peripheral surface of the roller body.

[0074] As the suction head 100 moves forward, foreign matter D on the cleaning surface can be suctioned into housings 111, 112L, 112R, and 113. A suction port 100B can be formed in the lower housing 113. Foreign matter D can be dispersed to the upper side of the suction port 100B by the rotation of the roller brush 200. Air and dispersed foreign matter D suctioned into housings 111, 112L, 112R, and 113 through the suction port 100B can be transferred to the extension tube 15 via the connector 16. Foreign matter D can then be collected in the foreign matter collection chamber 12 through the extension tube 15.

[0075] On the other hand, when the suction head 100 moves backward, depending on the position of the foreign object D within the suction head 100 during the cleaning process, the foreign object D may be separated and returned to the outside of the suction head 100, and thus cleaning may not be performed smoothly. This situation can also occur when the suction head 100 moves forward, although it occurs less frequently when the suction head 100 moves forward than when it moves backward. This cleaning situation may occur more frequently when the size of the foreign object D to be suctioned becomes larger.

[0076] To address these issues, a one-way roller 300 can be positioned in front of the roller brush 200 to prevent foreign matter D from being separated and returning to the outside of the housing. Specifically, when the suction head 100 moves forward, the one-way roller 300 can rotate to move foreign matter D into housings 111, 112L, 112R, and 113, and when the suction head 100 moves backward, the rotation of the one-way roller 300 can be constrained or restricted so that foreign matter D is not discharged to the outside of housings 111, 112L, 112R, and 113 (see [link to relevant documentation]). Figure 3 and Figure 4 ).

[0077] refer to Figure 3 and Figure 5 A roller seat 120 can be formed in the lower housing 113, allowing the unidirectional roller 300 to be rotatably positioned in front of the roller brush 200. The unidirectional roller 300 can be configured to be in close contact with the roller seat 120. A region 121 can be formed in which the roller seat 120 and the unidirectional roller 300 rub against each other while in close contact. The diameter D1 of the unidirectional roller 300 can be formed to be smaller than the diameter of the roller brush 200.

[0078] Multiple wheel modules 500, supported rotatably by a unidirectional roller 300, can be disposed at both ends of the unidirectional roller 300. The wheel modules 500 can also be supported rotatably by a lower housing 113.

[0079] Using the two structures, the following configuration can be implemented: when the suction head 100 moves forward, the one-way roller 300 rotates to move the foreign object D into the housings 111, 112L, 112R and 113; and when the suction head 100 moves backward, the rotation of the one-way roller 300 is constrained or limited to prevent the foreign object D from being discharged to the outside of the housings 111, 112L, 112R and 113.

[0080] The first structure can be implemented using multiple wheel modules 500 and one-way clutch bearings 400, which are disposed at both ends of the one-way roller 300 and supported by the one-way roller 300 in a rotatable manner, and the one-way clutch bearings 400 are fixed to the wheel modules 500.

[0081] Schematic, the one-way clutch bearing 400 can be configured to lock the roller 310, which serves as the axis of rotation of the one-way roller 300, when the suction head 100 moves forward, and to unlock the roller 310 when the suction head 100 moves backward.

[0082] Since the one-way clutch bearing 400 is fixed to the wheel module 500, the state in which the one-way clutch bearing 400 locks the roller shaft 310 can be a state in which the rotational force of the wheel module 500 is transmitted to the one-way roller 300 and therefore the one-way roller 300 also rotates.

[0083] Conversely, when the suction head 100 moves backward, the state of the one-way clutch bearing 400 unlocking the roller 310 can be as follows: the rotational force of the wheel module 500 is not transmitted to the one-way roller 300, and therefore even when the wheel module 500 rotates, the one-way roller 300 can have a different motion state than the wheel module 500.

[0084] The second structure can be implemented using a close contact configuration between the roller seat 120 and the one-way roller 300. The following state can be the same as above: when the suction head 100 moves backward, the one-way clutch bearing 400 unlocks the roller shaft 310, and therefore the one-way roller 300 can have a different motion state than the wheel module 500 even when the wheel module 500 rotates.

[0085] Therefore, in this case, the rotation of the one-way roller 300 is constrained or limited by the frictional force caused by the close contact structure between the roller seat 120 and the one-way roller 300. With the rotation of the one-way roller 300 constrained, the foreign object D is captured by the one-way roller 300 and can therefore be configured not to be discharged to the outside of the housings 111, 112L, 112R, and 113.

[0086] The following is a detailed description of the unidirectional roller 300, the wheel module 500, and the lower housing 113.

[0087] Figure 6An exploded perspective view of the unidirectional roller of a vacuum cleaner according to an embodiment of the present disclosure, as well as a perspective view of the wheel module and the support hook, are shown. Figure 7 This is an exploded perspective view of the wheel module of a vacuum cleaner according to an embodiment of the present disclosure. Figure 8 The diagram illustrates the effect when viewed from another direction. Figure 7 An exploded perspective view. Figure 9 When viewed from the left, along Figure 4 A sectional view of line BB. Figure 10 When viewed from the left, along Figure 8 A sectional view of the line FF.

[0088] refer to Figure 5 and Figure 6 The unidirectional roller 300 may include a roller shaft 310 and a roller body 320. The unidirectional roller 300 may also include a foreign object contactor 330 disposed on the outer peripheral surface of the roller body 320.

[0089] The roller 310 can be formed along the length direction 110 of the housing (see...). Figure 4 The unidirectional roller 300 may also include an insertion shaft 311 protruding from both ends at the side surface of the roller shaft 310.

[0090] The diameter of the insertion shaft 311 can be made smaller than the diameter of the roller shaft 310. Similar to the roller shaft 310, the insertion shaft 311 can be along the length direction 110 of the housing (see...). Figure 4 (Extended). In the example embodiment, the diameter of the insertion shaft 311 can be set to be greater than or equal to the diameter of the roller shaft 310.

[0091] The insertion shaft 311 can be inserted into the one-way clutch bearing 400, which will be described below. Specifically, the insertion shaft 311 can be fixed to the inner race 410 of the one-way clutch bearing 400. The detailed structural relationship between the insertion shaft 311 and the one-way clutch bearing 400 will be described below.

[0092] The roller body 320 can be formed into a cylindrical shape extending along the length direction 110 of the housing. The roller body 320 may include a hollow portion formed in the center of the roller body along the length direction 110 of the housing. The extension length of the roller body 320 can be set to a length corresponding to that of the roller shaft 310. The extension length of the roller body 320 can be set to be the same as the extension length of the roller shaft 310.

[0093] The roller shaft 310 can be disposed in the hollow portion of the roller body 320. The roller body 320 and the roller shaft 310 can be fixed in close contact with each other.

[0094] Foreign matter contactor 330 may be disposed on the outer peripheral surface of roller body 320. Specifically, foreign matter contactor 330 may be disposed as a velvety material. The velvety material may be formed in the form of fine hairs extending radially from the outer peripheral surface of roller body 320. That is, each fine hair may be disposed in a form that is densely embedded in the outer peripheral surface of roller body 320.

[0095] The velvet-like material can be made of nylon-based materials. Alternatively, it can be formed from antistatic materials. Or, it can be formed from carbon-based soft brushes.

[0096] In an example embodiment, the fluff may be formed from a rubber tube rather than by aggregating fine hairs to form the shape of the fluff.

[0097] Unlike the structure described above, in the example embodiment, the foreign object contactor 330 can be disposed on the outer peripheral surface of the roller 310. That is, the roller body 320 can be omitted in the unidirectional roller 300.

[0098] refer to Figure 3 , Figure 4 and Figure 6 Wheel modules 500 can be arranged at both ends of the one-way roller 300. Wheel modules 500 can be configured to support roller shafts 310, which serve as the rotation axis of the one-way roller 300. Wheel modules 500 can be configured to support insertion shafts 311 protruding from both ends of roller shaft 310. Insertion shafts 311 can be inserted into one side of wheel module 500. Insertion shafts 311 can be inserted into one-way clutch bearings 400 located on one side of wheel module 500. Insertion shafts 311 can be fixedly inserted into the rotation center portion of one-way clutch bearings 400 fixed to one side of wheel module 500. The detailed structural relationship between insertion shafts 311 and one-way clutch bearings 400 will be described below.

[0099] refer to Figure 6 Wheel modules 500 can be arranged at both ends of the unidirectional roller 300, and the diameter D2 of the wheel modules 500 can be set to be larger than the diameter D1 of the unidirectional roller 300. The wheel modules 500 can be configured to support the roller shaft 310, which serves as the rotation axis of the unidirectional roller 300. Therefore, when the suction head 100 is placed on the cleaning surface G (see...), Figure 5 When the unidirectional roller 300 is in contact with the cleaning surface G, it can be configured to have a separation distance g from the cleaning surface G (see [reference]). Figure 5 The structure of ).

[0100] The structure having a separation distance g from the cleaning surface G is used to prevent the unidirectional roller 300 from coming into complete contact with the cleaning surface G, and thereby prevent the unidirectional roller 300 from being affected by complete contact.

[0101] refer to Figure 7 and Figure 8The wheel module 500 may include a wheel frame 510 and an outer cover member 520.

[0102] The wheel frame 510 can be formed into a substantially cylindrical shape. An outer cover member 520 can be disposed on the outer peripheral surface of the wheel frame 510. The outer cover member 520 can be configured to correspond to the shape of the outer peripheral surface of the wheel frame 510.

[0103] The outer cover member 520 can perform the same function as a vehicle's tires. The outer cover member 520 can be formed of a material capable of increasing friction when in contact with the clean surface G. For example, the outer cover member 520 can be formed of a rubber material to increase friction when in contact with the clean surface G.

[0104] In the example embodiment, after the wheel frame 510 is initially injection molded, the outer cover member 520 can be injection molded a second time, thereby forming the wheel module 500. That is, for continuous injection molding, the outer cover member 520 can be injection molded, but a material with a higher coefficient of friction than the wheel frame 510 that was initially injection molded can be used as the injection molding material to form the outer cover member 520.

[0105] A step 513 can be formed on the outer peripheral surface of the wheel frame 510. By using the step 513 on the outer peripheral surface of the wheel frame, the wheel frame 510 can be more tightly connected to the outer cover member 520. A step 521 can even be formed on the inner peripheral surface of the outer cover member 520. The step 521 on the inner peripheral surface of the outer cover member can be formed to correspond to the step 513 on the outer peripheral surface of the wheel frame 510.

[0106] The wheel module 500 may also include a wheel axle 530 and a wheel bearing 540 for supporting the wheel axle 530. The wheel module 500 may also include a bearing cover 550 for covering the wheel bearing 540.

[0107] A one-way clutch bearing 400 may be disposed on one side surface of the wheel frame 510. A wheel axle 530 may protrude from the other side surface of the wheel frame 510 and may be configured as the rotation axis of the wheel frame 510.

[0108] like Figure 7 As illustrated, a method can be used to provide the protruding axle 530 in a configuration in which the axle 530 can be inserted into an axle insertion groove 514 formed in the other side surface of the wheel frame 510, and the axle 530 is inserted into the axle insertion groove 514. The insertion of the axle 530 into the axle insertion groove 514 allows the axle 530 to be secured to the wheel frame 510.

[0109] In the example embodiment, the axle 530 can be integrally formed with the wheel frame 510. That is, when the wheel frame 510 is injection molded, the axle 530 can also be injection molded.

[0110] Alternatively, in the example embodiment, the axle 530 may be formed to protrude from the lower housing 113. The axle insertion groove 514 may be rotatably engaged with the protruding axle 530.

[0111] refer to Figure 7 and Figure 8 The axle 530 is immediately supported by the lower housing 113 in a rotatable manner after being fixed to the other side surface of the wheel frame 510. However, for the durability and smooth rotational movement of the wheel module 500, a wheel bearing 540 may be provided. The axle 530 can be inserted into and supported by the wheel bearing 540. The wheel bearing 540 may be disposed on the outer peripheral surface of the axle 530 and can be supported by the lower housing 113.

[0112] refer to Figure 7 , Figure 8 and Figure 13 To ensure the durability and smooth rotation of the wheel module 500, a bearing cover 550 may be provided. The wheel bearing 540 can be inserted into and supported by the bearing cover 550. The bearing cover 550 may be disposed on the outer peripheral surface of the wheel bearing 540, and the wheel bearing 540 may be supported by the lower housing 113. In an example embodiment, the wheel bearing 540 may also be rotatably supported by the lower housing 113 immediately after the wheel axle 530 is inserted.

[0113] A wheel bearing insertion groove 553 can be formed in one surface of the bearing cover 550. The wheel bearing 540 can be inserted into the wheel bearing insertion groove 553. The bearing cover 550 can be configured to surround the wheel bearing 540. Because the bearing cover 550 is configured to surround the wheel bearing 540, the durability of the wheel bearing 540 can be ensured. Because the bearing cover 550 is configured to surround the wheel bearing 540, defects in the rotational movement of the wheel module 500 caused by foreign matter D accumulating around the wheel axle 530 of the wheel module 500 can be prevented.

[0114] In detail, the bearing cover 550 may include a bearing cover body 551 and a shielding portion 552. The bearing cover body 551 is configured to contact the wheel bearing seat 140 of the lower housing 113, which will be described below. The shielding portion 552 may be formed in a shape corresponding to the other side surface of the wheel frame 510. The shielding portion 552 may be configured to cover the entire other side surface or outer surface of the wheel frame 510 and prevent foreign matter D from accumulating around the axle 530.

[0115] The bearing cover body 551, which is mounted on the wheel bearing housing 140 of the lower housing 113, can be configured to be substantially cylindrical in shape. That is, the bearing cover 550, in which the bearing cover body 551 and the shielding portion 552 are integrally formed, can be configured to be substantially fedora in shape.

[0116] The suction head 100 may include a one-way clutch bearing 400 to perform the following functions: when the suction head 100 moves forward, the one-way roller 300 rotates to move foreign matter D into housings 111, 112L, 112R and 113, and when the suction head 100 moves backward, the rotation of the one-way roller 300 is constrained or limited to prevent foreign matter D from being discharged to the outside of housings 111, 112L, 112R and 113.

[0117] An overrunning clutch can be applied to a one-way clutch bearing 400. An overrunning clutch is a clutch that transmits driving force in only one direction. For example, when the outer ring of the clutch rotates in one direction, the rotational force is transmitted to the inner ring of the clutch, allowing both the outer and inner rings to rotate. Conversely, when the outer ring of the clutch rotates in the opposite direction, the rotational force is not transmitted to the inner ring. Thus, the outer and inner rings of the clutch can maintain different states of motion.

[0118] A one-way clutch bearing 400 may be disposed on a side surface or an inner surface of the wheel frame 510. Specifically, the one-way clutch bearing 400 may be inserted into a wheel frame recess 511 formed in said one side surface of the wheel frame 510. The wheel frame recess 511 may be formed in a shape corresponding to the outer peripheral surface of the one-way clutch bearing 400. The one-way clutch bearing 400 may be secured after being inserted into the wheel frame recess 511.

[0119] To secure the one-way clutch bearing 400 to the wheel frame recess 511, a mounting recess 421 can be formed in the outer peripheral surface of the one-way clutch bearing 400. The mounting recess 421 can be formed in the outer peripheral surface of the outer race 420 of the one-way clutch bearing 400. A one-way clutch bearing retaining portion 512 can be formed on the inner peripheral surface of the wheel frame recess 511 formed in one side surface of the wheel frame 510, corresponding to the mounting recess 421.

[0120] A mounting groove 421 and a one-way clutch bearing fixing part 512 can be formed along the direction of the rotation axis of the wheel module 500. The one-way clutch bearing 400 can be inserted into the wheel frame groove 511, and the mounting groove 421 and the one-way clutch bearing fixing part 512 can engage with each other.

[0121] The roller shaft 310 of the one-way roller 300 can be inserted into the one-way clutch bearing 400. Specifically, the roller shaft 310 can be fixedly inserted into the roller shaft fixing part 411, which is the inner circumferential surface of the inner race 410 of the one-way clutch bearing 400.

[0122] refer to Figure 10 The one-way clutch bearing 400 may include an outer race 420, an inner race 410, and bearing rollers 440.

[0123] The outer race 420 can be generally formed into a cylindrical shape, including a hollow portion in the center. The inner race 410 can be inserted into the hollow portion of the outer race 420 and is rotatably disposed inside the outer race 420.

[0124] A bearing roller housing 430 into which the bearing roller 440 can be inserted can be formed between the outer peripheral surface of the inner race 410 and the inner peripheral surface of the outer race 420. By forming the bearing roller housing 430, the inner race 410 includes a bearing roller support portion 412 projecting from the outer peripheral surface of the inner race 410 for supporting the bearing roller 440. For example, as... Figure 10 As illustrated, the inner race 410 can be formed into a substantially serrated shape.

[0125] The bearing roller housing 430 can be formed as a tapered structure that gradually narrows in the direction of movement R3 when the bearing roller 440 moves forward as the suction head 100 moves forward, as will be described below.

[0126] refer to Figure 10 A mounting groove 421 can be formed in the outer peripheral surface of the outer race 420 of the one-way clutch bearing 400. Two mounting grooves 421 are shown. However, for a secure connection between the one-way clutch bearing 400 and the wheel module 500, the number of mounting grooves 421 is not limited to two.

[0127] The wheel frame 510 and the one-way clutch bearing 400 of the wheel module 500 can be fixed to each other. Therefore, when the suction head 100 moves forward, the wheel module 500, which is in contact with the cleaning surface G, can rotate in direction R1, and the outer race 420 can also rotate in direction R1. That is, when the suction head 100 moves forward, the rotation direction of the wheel module 500 and the rotation direction of the outer race 420 can be defined as "direction R1" (see [reference]). Figure 14 ).

[0128] When the outer race 420 rotates in direction R1, the bearing roller 440 can move in direction R3. That is, when the suction head 100 moves forward, the direction of movement of the bearing roller 440 can be defined as "direction R3".

[0129] The bearing roller housing 430 can be formed as a tapered structure, which gradually narrows in the direction R3 of movement of the bearing roller 440 as the suction head 100 moves forward, as will be described below. Therefore, the bearing roller 440 can move along direction R3 and contact the inner circumferential surface of the outer race 420 and the outer circumferential surface of the inner race 410. As a result, the rotational force of the outer race 420 can be transmitted to the inner race 410. When the suction head 100 moves forward, the inner race 410 rotates along direction R2.

[0130] The roller shaft 310 can be fixedly inserted into the roller shaft fixing part 411, which is the inner circumferential surface of the inner race 410 of the one-way clutch bearing 400, as will be described below. Therefore, when the inner race 410 rotates in direction R2, the roller shaft 310 can also rotate in direction R2. Therefore, when the inner race 410 rotates in direction R2, the one-way roller 300 can also rotate in direction R2. That is, when the suction head 100 moves forward, the rotation direction of the inner race 410 and the rotation direction of the one-way roller 300 can be defined as "direction R2".

[0131] This state can be defined as the state in which the one-way clutch bearing 400 locks the roller shaft 310, which serves as the axis of rotation of the one-way roller 300, when the suction head 100 moves forward.

[0132] Since the one-way clutch bearing 400 is fixed to the wheel module 500, the state in which the one-way clutch bearing 400 locks the roller shaft 310 can be a state in which the rotational force of the wheel module 500 is transmitted to the one-way roller 300 and thus the one-way roller 300 also rotates.

[0133] Conversely, as the suction head 100 moves backward, the outer race 420 rotates in the direction opposite to direction R1. The bearing roller 440 can move in the direction opposite to direction R3 and contact one of the inner circumferential surfaces of the outer race 420 and the outer circumferential surface of the inner race 410. In some cases, when the bearing roller 440 moves in the direction opposite to direction R3, it can be positioned such that it neither contacts the inner circumferential surface of the outer race 420 nor the outer circumferential surface of the inner race 410.

[0134] As a result, the rotational force of the outer race 420 is not transmitted to the inner race 410. The outer race 420 and the inner race 410 can maintain different states of motion. In other words, the wheel module 500 and the unidirectional roller 300 can maintain different states of motion. For example, the unidirectional roller 300 is fixed, and only the wheel module 500 can rotate.

[0135] This state can be defined as the state in which the one-way clutch bearing 400 is unlocked as the one-way roller 310 serves as the axis of rotation of the one-way roller 300 when the suction head 100 moves backward.

[0136] The state of the one-way clutch bearing 400 unlocking roller 310 can be as follows: the rotational force of the wheel module 500 is not transmitted to the one-way roller 300, and therefore even when the wheel module 500 rotates, the one-way roller 300 can have a different motion state than the wheel module 500.

[0137] refer to Figures 3 to 6 The one-way roller 300, the one-way clutch bearing 400, and the wheel module 500 can share a common axis of rotation and can be connected to each other in a straight line. That is, the roller shaft 310 of the one-way roller 300 can be connected to the one-way clutch bearing 400 via an insertion shaft 311. Specifically, the insertion shaft 311 can be fixed to a roller shaft fixing portion 411, which serves as the inner circumferential surface of the inner race 410 of the one-way clutch bearing 400. The one-way clutch bearing 400 can be fixed to a wheel frame groove 511 formed on one side of the wheel frame 510 of the wheel module 500.

[0138] refer to Figures 3 to 6 The illustration shows identical wheel modules 500 arranged at both ends of the unidirectional roller 300. However, in the example embodiment, the wheel module 500 may be provided only at one end of the unidirectional roller 300, thereby enabling the locking or unlocking power transmission structure described above.

[0139] One-way rollers 300, one-way clutch bearings 400 and wheel modules 500 connected to each other in a straight line can be mounted on the lower housing 113.

[0140] Figure 11 This is a perspective view of the bottom surface of the lower housing of the suction head of a vacuum cleaner according to an embodiment of the present disclosure. Figure 12 This is a bottom view of the lower housing of the suction head of a vacuum cleaner according to an embodiment of the present disclosure. Figure 13 When viewed from the left, along Figure 4 A sectional view of line CC.

[0141] refer to Figure 3 , Figure 5 , Figure 11 and Figure 12The lower housing 113 may include a roller seat 120, in which a one-way roller 300 is disposed. The roller seat 120 may be formed in front of the location where the roller brush 200 is disposed. The inner peripheral surface of the roller seat 120 may be formed to correspond to the upper outer peripheral surface of the one-way roller 300 so as to make close contact with the one-way roller 300. Specifically, the inner peripheral surface of the roller seat 120 may be formed to correspond to the outer peripheral surface of the foreign object contactor 330. The inner peripheral surface of the roller seat 120 may be formed to be substantially cylindrical.

[0142] Therefore, refer to Figure 5 A region 121 can be formed in which the roller seat 120 and the unidirectional roller 300 rub against each other while in close contact with each other. The region 121 in which the roller seat 120 and the unidirectional roller 300 rub against each other while in close contact with each other can be formed to correspond to half of the outer peripheral surface of the unidirectional roller 300.

[0143] refer to Figure 11 and Figure 12 The lower housing 113 may include a wheel seat 130 formed on one side of the roller seat 120 and housing the wheel module 500. The wheel seat 130 may be formed in a shape corresponding to the wheel module 500, and in particular in a shape corresponding to the outer peripheral surface of the outer cover member 520.

[0144] Since the diameter D2 of the wheel module 500 is formed to be larger than the diameter D1 of the unidirectional roller 300, a step can be formed in the portion extending from the roller seat 120 to the wheel seat 130. This can be defined as step 23 between the roller seat 120 and the wheel seat 130.

[0145] Unlike roller seat 120, in the example embodiment, wheel seat 130 may not be in close contact with wheel module 500 and may be spaced apart from wheel module 500. With this structure, wheel module 500 can rotate smoothly.

[0146] refer to Figure 11 and Figure 13 The lower housing 113 may also include a wheel bearing seat 140, which is formed on one side of the wheel seat 130, and the wheel bearing 540 is disposed in the wheel bearing seat 140. Specifically, since the bearing cap 550 surrounding the wheel bearing 540 can be disposed on the outer peripheral surface of the wheel bearing 540, the inner peripheral surface of the wheel bearing seat 140 can contact the bearing cap body 551 of the bearing cap 550.

[0147] Since the diameter of the wheel bearing 540 is formed to be smaller than the diameter of the wheel module 500, a step can be formed in the portion extending from the wheel seat 130 to the wheel bearing seat 140. This can be defined as step 34 between the wheel seat 130 and the wheel bearing seat 140.

[0148] refer to Figures 11 to 13 The wheel bearing housing 140 may include an opening 141 that opens onto the bottom surface of the lower housing 113. Multiple wheel bearing housings 140 may be formed to correspond to the number of wheel modules 500, and the opening 141 may be formed only in some of the multiple wheel bearing housings 140. Figure 11 and Figure 12 The illustration shows an opening formed in the wheel bearing housing 140 near the left cover 112L, but the present disclosure is not limited thereto.

[0149] The suction head 100 may also include a support hook 150, such that the unidirectional roller 300 and wheel module 500, which are connected to each other in a straight line, can be fixedly arranged in the roller seat 120, wheel seat 130, and wheel bearing seat 140. The support hook 150 may be formed in a generally hook-shaped form.

[0150] refer to Figure 11 and Figure 13 The support hook 150 can be configured to close the opening 141 and support the wheel bearing 540 housed in the wheel bearing housing 140. In detail, since the bearing cover 550 surrounding the wheel bearing 540 can be provided on the outer peripheral surface of the wheel bearing 540, the inner peripheral surface 152 of the support hook 150 and the bearing cover body 551 of the bearing cover 550 can contact each other.

[0151] One end of the support hook 150 can be rotatably connected to the lower housing 113. The support hook 150 can rotate about the support hook rotation axis 151.

[0152] A fastening protrusion 153 can be formed at the other end of the support hook 150, so that the support hook 150 can be fixedly hooked to the lower housing 113. A fastening groove 142 can be provided in the lower housing 113 at a position corresponding to the fastening protrusion 153.

[0153] In the suction head 100, when the unidirectional roller 300 and wheel module 500, which are connected to each other in a straight line, are placed inside the roller seat 120, wheel seat 130 and wheel bearing seat 140, the support hook 150 rotates toward the lower housing 113, and then the fastening protrusion 153 and the fastening groove 142 can be connected to each other.

[0154] Figure 14 yes Figure 5 A portion of a cross-sectional view illustrating the operation process when the suction head of a vacuum cleaner according to an embodiment of the present disclosure moves forward. Figure 15 yes Figure 5 A portion of a cross-sectional view illustrating the operation process when the suction head of a vacuum cleaner according to an embodiment of the present disclosure moves backward.

[0155] refer to Figure 14 When the suction head 100 moves forward, the outer cover member 520 of the wheel module 500 rotates in direction R1 because it contacts the cleaning surface G. When the suction head 100 moves forward, the one-way clutch bearing 400 and the roller shaft 310 of the one-way roller 300 are locked, causing the one-way roller 300 and the wheel module 500 to rotate in the same direction. That is, even when friction is applied to the area 121 where the roller seat 120 and the one-way roller 300 rub against each other while in close contact, a large rotational force is applied from the wheel module 500, and therefore the one-way roller 300 and the wheel module 500 can rotate in the same direction.

[0156] While rotating, the unidirectional roller 300 comes into contact with the foreign object D on the clean surface G, and the foreign object D is introduced into the housings 111, 112L, 112R and 113 along the direction R2 which is the rotation direction of the unidirectional roller 300.

[0157] Conversely, refer to Figure 15 When the suction head 100 moves backward, the outer cover member 520 of the wheel module 500 rotates in the opposite direction to direction R1 because it comes into contact with the cleaning surface G. When the suction head 100 moves backward, the rotational force of the wheel module 500 is not transmitted to the one-way roller 300 because the one-way clutch bearing 400 and the roller shaft 310 of the one-way roller 300 are unlocked.

[0158] Conversely, the unidirectional roller 300 attempts to maintain its position along the direction due to rotational inertia in the forward state. Figure 14 The rotation state in the direction R2 shown in the figure is constrained or limited after a certain period of time due to the frictional force of the area 121 in which the roller seat 120 and the one-way roller 300 rub against each other while in close contact. That is, the state of being fixed to the lower housing 113 is maintained due to the frictional force of the area 121 in which the roller seat 120 and the one-way roller 300 rub against each other while in close contact. In particular, since the one-way roller 300 is spaced apart from the cleaning surface G, no frictional force is applied to rub against the cleaning surface G. Therefore, when the suction head 100 moves backward, since the rotation of the one-way roller 300 in the direction opposite to the direction R2 is constrained or limited, the foreign object D introduced into the housing is captured by the one-way roller 300, and accordingly, the foreign object D can be prevented from being separated and returning to the outside of the suction head 100.

[0159] While some embodiments of this disclosure have been shown and described, those skilled in the art will understand that changes may be made to these embodiments without departing from the principles and spirit of this disclosure, the scope of which is defined in the claims and their equivalents.

Claims

1. A vacuum cleaner, comprising: The cleaner body includes a motor and a foreign matter collection chamber, the motor being configured to generate suction force; and A suction head, connected to the cleaner body, and comprising: Housing, the housing having a suction port; Roller brush; A unidirectional roller is disposed in front of the roller brush; A wheel module, which supports the suction head and is disposed at at least one end of the unidirectional roller; and A one-way clutch bearing is provided, which is connected to at least one end of the wheel module and the one-way roller, such that the one-way roller, the one-way clutch bearing, and the wheel module share a common axis of rotation and are connected to each other in a straight line. The roller brush and the unidirectional roller are configured such that: As the suction head moves forward on the surface to be cleaned while the wheel module rotates, the roller brush and the one-way roller rotate, causing foreign objects on the surface to be cleaned to be drawn into the housing through the suction port by the suction force, and then guided to the foreign object collection chamber. As the suction head moves backward on the surface to be cleaned while the wheel module rotates, the rotation of the one-way roller is constrained to prevent foreign matter sucked into the housing from being discharged to the outside of the housing of the suction head through the suction port.

2. The vacuum cleaner according to claim 1, wherein, The unidirectional roller includes: Rollers; and A roller body is fixed to the outer peripheral surface of the roller shaft and is configured such that when the suction head is on the surface to be cleaned, the roller body contacts at least some of the foreign objects on the surface to be cleaned below the suction head.

3. The vacuum cleaner according to claim 2, wherein, The one-way clutch bearing is connected to at least one end of the roller shaft and is configured to support the at least one end of the roller shaft.

4. The vacuum cleaner according to claim 3, wherein, The one-way clutch bearing locks the roller shaft during the forward movement of the suction head, causing the roller shaft to rotate, and The one-way clutch bearing unlocks the roller during the rearward movement of the suction head, thereby constraining the rotation of the roller.

5. The vacuum cleaner according to claim 2, wherein, The unidirectional roller also includes a foreign object contactor disposed on the outer peripheral surface of the roller body and comprising a lint-like material configured to contact at least one of the foreign objects on the surface to be cleaned below the suction head when the suction head is on the surface to be cleaned.

6. The vacuum cleaner according to claim 3, wherein, The roller shaft is connected to the one-way clutch bearing at at least one end of the one-way roller, and the wheel module is configured to support the at least one end of the roller shaft via the one-way clutch bearing.

7. The vacuum cleaner according to claim 6, wherein, The wheel module includes: A wheel frame, wherein the one-way clutch bearing is fixed to the wheel frame on the inner surface of the wheel frame; A wheel axle, the wheel axle projecting from the outer surface of the wheel frame and configured as the axis of rotation of the wheel frame; and A wheel bearing that supports the wheel axle.

8. The vacuum cleaner according to claim 7, wherein, The housing includes a roller seat, and the unidirectional roller is disposed within the roller seat; and The inner circumferential surface of the roller holder is shaped such that the upper outer circumferential surface of the unidirectional roller contacts the unidirectional roller to provide friction between the inner circumferential surface of the roller holder and the upper outer circumferential surface of the unidirectional roller.

9. The vacuum cleaner according to claim 8, wherein, The housing also includes: A wheel seat, formed on one side of the roller seat and accommodating the wheel module; and A wheel bearing housing, the wheel bearing housing being formed on the outer side of the wheel seat, and the wheel bearing being disposed in the wheel bearing housing.

10. The vacuum cleaner according to claim 9, wherein, The wheel bearing housing includes an opening facing the bottom surface of the housing, and The vacuum cleaner also includes a support hook configured to close the opening and support the wheel bearing housed in the wheel bearing housing. The support hook has one end rotatably connected to the housing and the other end connected to the housing to support the wheel bearing.

11. The vacuum cleaner according to claim 7, wherein, The wheel frame includes a wheel frame groove formed in the inner surface of the wheel frame, such that the one-way clutch bearing is fixedly inserted into the wheel frame groove.

12. The vacuum cleaner according to claim 6, wherein, The diameter of the wheel module is larger than the diameter of the unidirectional roller.

13. The vacuum cleaner according to claim 7, wherein, The vacuum cleaner includes multiple wheel modules. At least one of the plurality of wheel modules further includes an outer cover member, which is fixed to the outer peripheral surface of the wheel frame of the wheel module and surrounds the outer peripheral surface of the wheel frame of the wheel module.

14. The vacuum cleaner according to claim 13, wherein, The outer cover member is configured such that when the suction head is on the surface to be cleaned, it contacts the surface to be cleaned, and the outer cover member is formed of a rubber material to increase the frictional force of friction with the surface to be cleaned.

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