Electric brush

Abstract

The utility model provides an electric brush. The electric brush comprises a shell, a driving unit, a brush head base and a brush head assembly. The shell comprises a shell body and a cover body connected to the shell body, the cover body is provided with an open end and a closed end which are opposite, the closed end of the cover body is sunken towards the interior of the shell body, and a first containing cavity is formed in the cover body. The driving unit is arranged in the shell body. The brush head base is connected with the driving unit so that the brush head base can rotate relative to the shell, and the brush head base is arranged in the first containing cavity. The brush head assembly comprises a connecting part, a mounting part and a cleaning part which are arranged in sequence; the connecting part is in transmission connection with the brush head seat from the open end, so that the brush head assembly and the brush head seat synchronously move; and in the rotating axis direction of the brush head seat, a gap L1 is formed between the shell and the mounting part, a gap L2 is formed between the brush head seat and the mounting part in a contact or between the brush head seat and the mounting part, and L2 is smaller than L1. According to the electric brush, stable rotation between the brush head base and the brush head can be achieved, and therefore the vibration sense is weak and noise is low when the electric brush is used.

Description

Technical Field

[0001] This application relates to the field of electric cleaning tools, and more specifically, to an electric brush. Background Technology

[0002] Small electric brushes are typically used for cleaning stovetops, kitchen countertops, tile grout, shoes, etc. When using them, the user usually holds the handle and then operates the brush. During cleaning, force needs to be applied to the brush head for better cleaning results. However, if too much force is applied to the brush head, it is prone to deflection. This reduces cleaning effectiveness and causes wear, vibration, and noise due to friction between the brush head and the outer casing. Utility Model Content

[0003] The purpose of this application is to provide an electric brush that reduces the problem of brush head assembly deflection during use.

[0004] In a first aspect, embodiments of this application provide an electric brush, including a housing, a drive unit, a brush head holder, and a brush head assembly. The housing includes a housing body and a cover connected to the housing body. The cover has an open end and a closed end, with the closed end recessed into the interior of the housing body. The interior of the cover has a first receiving cavity. The drive unit is disposed within the housing body. The brush head holder is connected to the drive unit to rotate relative to the housing, and the brush head holder is disposed within the first receiving cavity. The brush head assembly includes a connecting portion, a mounting portion, and a cleaning portion arranged sequentially. The connecting portion is drively connected to the brush head holder from the open end to enable the brush head assembly to move synchronously with the brush head holder. Furthermore, in the direction of the rotation axis of the brush head holder, there is a gap L1 between the housing and the mounting portion, and the brush head holder contacts the mounting portion or has a gap L2 between the housing and the mounting portion, where L2 < L1.

[0005] In the above technical solution, since there is a gap L1 between the outer shell and the mounting part in the direction of the rotation axis of the brush head holder, the outer shell will not contact the mounting part during the rotation of the brush head assembly, thereby avoiding wear, vibration and noise between the brush head assembly and the outer shell; after the connecting part of the brush head assembly is connected to the brush head holder, the brush head assembly and the brush head holder rotate synchronously, and the brush head holder also contacts the mounting part or has a gap L2 between it and the mounting part, and L2 < L1 can, to a certain extent, allow the brush head holder to restrict the movement of the brush head assembly, reduce the deflection of the brush head assembly after being subjected to force, and ensure the cleaning effect.

[0006] In some alternative implementations, the lower end of the brush head holder has an annular plane, and the annular plane forms an annular surface contact with the mounting portion.

[0007] In the above technical solution, since the lower end of the brush head holder has an annular plane for forming an annular surface contact with the mounting part of the brush head assembly, the lower end of the brush head holder is in contact with the mounting part in the circumferential direction of the brush head holder's rotation. This makes the force on the brush head assembly more uniform after installation. When the brush head assembly tends to deflect in any direction due to the force, the brush head holder can provide good resistance to the mounting part of the brush head assembly, making the rotation of the brush head assembly more stable. Therefore, it can reduce the vibration and noise of the electric brush during use, and the cleaning effect is also better.

[0008] In some alternative embodiments, the brush head holder has a second receiving cavity with an opening at one end facing the cleaning part; in the direction of the rotation axis of the brush head holder, a connecting part extends into the second receiving cavity from the opening and is connected to the brush head holder.

[0009] In the above technical solution, the connecting part extends into the second receiving cavity and connects with the brush head seat. This connection method allows the brush head assembly to be directly inserted into the second receiving cavity for connection, which is convenient. In the direction of the rotation axis of the brush head seat, the brush head seat has a certain wrapping effect on the connecting part, which can further limit the deflection of the brush head assembly after being subjected to force.

[0010] In some alternative implementations, the lower end of the brush head holder extends out of the first receiving cavity; the connecting portion extends from the opening into the second receiving cavity by at least 5 mm.

[0011] In the above technical solution, since the connecting part extends into the second receiving cavity by at least 5 mm from the opening, the brush head seat has a better wrapping effect on the connecting part; since the lower end of the brush head seat extends out of the first receiving cavity, the size of the part of the shell body with the cover in the direction of the rotation axis of the brush head seat can be smaller, thereby making the structure of the electric brush head more compact; and it is also easier to achieve a gap between the shell and the mounting part in the direction of the rotation axis of the brush head seat, so that the brush head seat contacts the mounting part, thereby achieving the purpose of more stable rotation of the brush head assembly, less vibration and less noise when the electric brush is in use.

[0012] In some alternative embodiments, the mounting part has a first plane on one side of the connecting part. In the direction of the rotation axis of the brush head seat, the projections of the lower end of the brush head seat and the cover body both fall within the first plane. There is a gap between the lower end of the cover body and the first plane, and the lower end of the brush head seat contacts the first plane.

[0013] In the above technical solution, since the lower end of the cover and the lower end of the brush head holder both fall within the first plane, and the first plane is relatively large, it is convenient to clean the dirt in the first plane after the electric brush is used. There is a gap between the lower end of the cover and the first plane, therefore, during the operation of the electric brush, friction is less likely to occur between the fixed cover and the rotating mounting part. The lower end of the brush head holder contacts the first plane, resulting in a better fit between the brush head holder and the connecting part, better limiting the deflection of the brush head assembly, and thus achieving more stable rotation of the brush head assembly during use.

[0014] In some alternative embodiments, the mounting part has a stepped surface on one side of the connecting part. In the direction of the rotation axis of the brush head seat, the projections of the lower end of the brush head seat and the cover body both fall within the stepped surface. There is a gap between the lower end of the cover body and the stepped surface, and the lower end of the brush head seat contacts the stepped surface.

[0015] In some alternative embodiments, a transmission unit is connected between the drive unit and the brush head holder; the transmission unit includes a drive shaft, a first gear connected to one end of the drive shaft, a second gear meshing with the first gear, the other end of the drive shaft connected to the drive unit, and the gear shaft of the second gear connected to the brush head holder; the housing has a head, a neck, and a handle portion arranged sequentially; the drive unit is disposed within the handle portion; the drive shaft is disposed within the neck, and a cover is connected to the housing body of the head; the first gear and the second gear are disposed on the head, with the first gear facing the side of the cover and the second gear facing the closed end of the cover.

[0016] In the above technical solution, the first gear is positioned towards the side of the cover, and the second gear is positioned towards the closed end of the cover. This allows for a more compact layout within the electric brush head, improving the space utilization of the electric brush head and resulting in a smaller size. Furthermore, the use of gear transmission to drive the brush head holder results in low noise and minimal vibration during operation.

[0017] In some alternative embodiments, the mounting portion has a recessed groove facing the cleaning portion on the side facing the brush head seat, the connecting portion is disposed in the groove, and the brush head seat extends into the groove and connects with the connecting portion.

[0018] In the above technical solution, the brush head assembly and the brush head base are connected by inserting the brush head base into the groove of the mounting part.

[0019] In some alternative implementations, a transmission unit is connected between the drive unit and the brush head holder; the transmission unit includes a first transmission member and a second transmission member connected by a universal joint, the first transmission member being connected to the drive unit, and the second transmission member being connected to the end of the brush head holder away from the cleaning part; the electric brush is configured such that the drive unit drives the first transmission member to rotate, which in turn drives the brush head holder to rotate via the second transmission member.

[0020] In some alternative embodiments, the shell body and the cover body are integrally formed and connected. In some alternative embodiments, a flange is provided between the brush head seat and the cover body in the radial direction of the brush head seat's rotation circumference.

[0021] In the above technical solution, by providing a flange between the brush head holder and the cover, when the brush head holder deflects relative to the cover and friction occurs, the contact between the brush head holder and the cover through the flange makes the rotation of the brush head assembly connected to the brush head holder smoother. Furthermore, the area of ​​the brush head holder other than the flange basically does not contact the cover, further reducing friction between the brush head holder and the cover and minimizing the impact on the rotation of the brush head holder. This results in smoother rotation of the brush head assembly during use, with less vibration and noise.

[0022] In some alternative implementations, the flange is a closed annular structure; or the flange is a plurality of circumferentially spaced protrusions.

[0023] In the above technical solution, the flanges are distributed relatively evenly on the circumference. Therefore, when the brush head seat deflects relative to the cover, the angle of deflection of the brush head seat relative to the cover can be limited to ensure the cleaning effect.

[0024] In some alternative implementations, the flange size is in the range of 1-3 mm in the direction of the rotation axis of the brush head holder.

[0025] In the above technical solution, the flange has a certain size, which can reduce the wear area while maintaining a certain level of wear resistance. This can make the rotation of the brush head assembly more stable and reduce the friction between the brush head seat and the cover.

[0026] In some alternative implementations, a flange is provided between the outer side of the brush head holder near the open end and the cover, and a gap is provided between the outer side of the brush head holder near the closed end and the cover.

[0027] In the above technical solution, the flange is located on the outside of the brush head seat, which facilitates processing; there is a gap between the outer side of the brush head seat near the closed end and the cover, thus avoiding friction between the brush head seat and the cover at the gap position.

[0028] In some alternative implementations, grease is provided within the gap.

[0029] In the above technical solution, the gap between the upper part of the outer wall of the brush head holder and the inner wall of the cover not only prevents the upper part of the brush head holder from contacting the cover and causing friction, but also allows for the placement of lubricating grease. When the flange between the cover and the brush head holder moves relative to each other, the lubricating grease in the gap will enter the gap between the two at the flange, further reducing friction at the flange between the cover and the brush head holder. This makes the rotation of the brush head assembly smoother, with less vibration and less noise when the electric brush is in use.

[0030] In some alternative implementations, the gap size is 0.1-1.0 mm in the radial direction.

[0031] In the above technical solution, the gap is within the above size range, which can better accommodate the grease. At the same time, it can make the gap more reasonable, thereby making the radial dimension of the flange more reasonable and reducing the head size of the electric brush.

[0032] In some alternative implementations, the connector is plugged into or snapped into the brush head holder to achieve a detachable connection between the connector and the brush head holder.

[0033] In the above technical solution, the brush head assembly is detachably connected by plugging or snapping, allowing for the replacement of the brush head assembly to accommodate different cleaning areas.

[0034] In some alternative implementations, the brush head holder is provided with a first connector and the connecting part is provided with a second connector; one of the first connector and the second connector is a magnet and the other is a ferromagnetic structural component; or both the first connector and the second connector are magnets.

[0035] In the above technical solution, the brush head base and the brush head assembly can be detachably connected by magnetic attraction, which is convenient for replacing the brush head assembly. Moreover, the magnetic attraction structure is relatively simple, and the stains at the connection between the brush head assembly and the brush head base are easy to clean.

[0036] In some alternative implementations, one of the first connector and the second connector is a ring-shaped structure and the other is a block-shaped structure; or, both the first connector and the second connector are block-shaped structures; when the brush head assembly is connected to the brush head seat, one side surface of the first connector and one side surface of the second connector are arranged opposite to each other.

[0037] In the above technical solution, the first connector and the second connector can be either block-shaped or ring-shaped structures, enabling them to be connected by magnetic attraction. When the brush head assembly is connected to the brush head base, one side surface of the first connector and one side surface of the second connector are positioned opposite each other, which allows for a larger magnetic force attracting the first connector and the second connector, thereby making the connection between the brush head assembly and the brush head base more reliable.

[0038] In some alternative implementations, the cross-sectional profiles of the connector and the inner sidewall of the brush head holder are both polygonal in the direction perpendicular to the magnetic attraction, so that the brush head holder drives the connector to rotate.

[0039] In the above technical solution, since the cross-sectional profile of the connecting part and the inner sidewall of the brush head seat is polygonal, when the brush head seat and the brush head assembly rotate synchronously, the rotation between the brush head seat and the brush head assembly is more consistent, and the rotation of the brush head assembly is more stable. This can reduce the vibration of the electric brush during use and also prevent the cleaning fluid from splashing when the electric brush is cleaning.

[0040] In some alternative implementations, the side of the mounting portion facing away from the connecting portion is an arcuate surface that protrudes away from the connecting portion; the cleaning portion is bristles that extend in a direction perpendicular to the normal of the arcuate surface.

[0041] In the above technical solution, since the bristles extend in a direction perpendicular to the arc surface, the bristles are durable and not easily deformed. Furthermore, the bristles extend outward from the end away from the mounting part, which facilitates cleaning of corners. Attached Figure Description

[0042] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 A schematic diagram of an electric brush provided in an embodiment of this application from a first-view perspective;

[0044] Figure 2 A schematic diagram of an electric brush provided in an embodiment of this application from a second perspective;

[0045] Figure 3 A schematic diagram of the electric brush head provided in an embodiment of this application;

[0046] Figure 4 A schematic diagram of the casing provided in an embodiment of this application;

[0047] Figure 5 A cross-sectional view of the housing provided in an embodiment of this application;

[0048] Figure 6 A cross-sectional view of the electric brush handle provided in an embodiment of this application;

[0049] Figure 7 A cross-sectional view of the head of an electric brush handle provided in an embodiment of this application;

[0050] Figure 8 A cross-sectional view of the head of an electric brush provided in an embodiment of this application;

[0051] Figure 9 for Figure 8 Enlarged view of point A in the middle;

[0052] Figure 10 This is a schematic diagram showing a gap between the brush head holder and the mounting part;

[0053] Figure 11 A schematic diagram of a brush head assembly provided in one embodiment of this application;

[0054] Figure 12 A schematic diagram of a brush head assembly provided in another embodiment of this application from a first-view perspective;

[0055] Figure 13 for Figure 12 A schematic diagram of the brush head assembly from a second-view perspective;

[0056] Figure 14 for Figure 6 Internal diagram of the electric brush handle;

[0057] Figure 15 A cross-sectional view of an electric brush using a universal joint for transmission, provided in an embodiment of this application;

[0058] Figure 16 A cross-sectional view of the head of an electric brush handle that uses a universal joint for transmission, provided in an embodiment of this application;

[0059] Figure 17 A cross-sectional view of the head of a gear-driven electric brush provided in an embodiment of this application;

[0060] Figure 18 This is a schematic diagram of a brush head holder protruding from a first receiving cavity according to an embodiment of this application;

[0061] Figure 19 This is a cross-sectional view of a brush head assembly provided in an embodiment of this application.

[0062] Icons: 100-Electric brush handle; 111-Head; 112-Neck; 113-Handle section; 120-Shell body; 130-Cover; 131-First receiving cavity; 132-Closed end; 133-Open end; 140-Brush head holder; 141-Second receiving cavity; 143-First connector; 144-Annular plane; 145-Flange; 146-First part; 147-Second part; 148-Second plane; 150-Transmission unit; 151-First gear; 152-Second gear; 1521-Gear shaft; 153-Drive shaft; 1541-First transmission component; 1542-Second transmission component; 160-Drive unit; 200-Brush head assembly; 210-Cleaning section; 220-Mounting section; 230-Connecting section; 231-Second connector; 240-First plane. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0064] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0065] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0066] In the description of this application, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0067] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0068] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0069] This application provides an electric brush, such as... Figure 1 and Figure 2 and Figure 11 As shown, the electric brush includes an electric brush handle 100 and a brush head assembly 200 connected to the electric brush handle 100. The electric brush handle 100 is for the user to hold and for mounting the brush head assembly 200. The cleaning part 210 of the brush head assembly 200 is used to contact and clean dirt.

[0070] like Figures 1 to 3 As shown, the electric brush handle 100 includes a housing, which comprises a housing body 120 and a cover 130; the housing body 120 is the outer structure visible to the naked eye and is used for the user to hold. Figure 4 and Figure 5 As shown, the cover 130 has an open end 133 and a closed end 132; the closed end 132 of the cover 130 is recessed into the interior of the shell body 120, and the interior of the cover 130 has a first receiving cavity 131, with the open end 133 of the cover 130 communicating with the first receiving cavity 131. Figures 5 to 7As shown, the cover 130 is also rotatably connected to a brush head holder 140, which is disposed within the first receiving cavity 131. The first receiving cavity 131 of the cover 130 is formed by the closed end 132 of the cover 130 recessing into the shell body 120, and the open end 133 of the cover 130 is used to insert the brush head holder 140 into the first receiving cavity 131. The closed end 132 of the cover 130 does not mean that the closed end 132 is completely closed without any holes, but rather that the closed end 132 cannot allow the brush head holder 140 to pass through. The brush head holder 140 may be entirely located within the first receiving cavity 131, or it may be partially located within the first receiving cavity 131 and partially located outside the first receiving cavity 131. Because the closed end 132 of the cover 130 is recessed into the interior of the shell body 120, and the brush head seat 140 is located after the first receiving cavity 131, the size of the head of the electric brush is relatively small, and correspondingly, the size of the electric brush head is also relatively small. The head of the electric brush is the location where the brush head assembly 200 is located. The head of the electric brush includes the head of the electric brush handle 100 and also the head 111 of the shell. Furthermore, in some embodiments, the cover 130 and the shell body 120 are integrally formed and connected.

[0071] like Figure 6 As shown, a drive unit 160 is also provided inside the housing body 120. The drive unit 160 is rotatably connected to the brush head holder 140, that is, the drive unit 160 drives the brush head holder 140 to rotate relative to the cover 130. The drive unit 160 can be located at the head of the electric brush or at other parts of the electric brush.

[0072] like Figure 8 , Figures 11 to 12 As shown, the brush head assembly 200 includes a connecting portion 230, a mounting portion 220, and a cleaning portion 210 arranged sequentially. Specifically, in a certain direction, the connecting portion 230 is located on one side of the mounting portion 220, and the cleaning portion 210 is located on the other side of the mounting portion 220, or the mounting portion 220 is located between the connecting portion 230 and the cleaning portion 210. The connecting portion 230 is used to connect the brush head holder 140, and the mounting portion 220 is used to mount the connecting portion 230 and the cleaning portion 210. The connecting portion 230 is drive-connected to the brush head holder 140 from its opening end 133. That is, during the process of connecting the brush head assembly 200 and the brush head holder 140, the connecting portion 230 is inserted into the first receiving cavity 131 from the opening end 133 of the cover 130. Through the drive-connection between the connecting portion 230 and the brush head holder 140, the brush head assembly 200 and the brush head holder 140 can move synchronously.

[0073] In some implementations, such as Figure 12 and Figure 13As shown, the side of the mounting portion 220 facing away from the connecting portion 230 is an arc-shaped surface that protrudes away from the connecting portion 230; the cleaning portion 210 has bristles that extend in a direction perpendicular to the normal direction of the arc-shaped surface, thus making the bristles durable, resistant to deformation, and easy to clean corners. In other embodiments, the side of the mounting portion 220 facing away from the connecting portion 230 may also be a flat surface.

[0074] like Figure 8 and Figure 9 As shown, in the direction of the rotation axis of the brush head holder 140, there is a gap L1 between the outer shell and the mounting part 220, and the brush head holder 140 contacts the mounting part 220; or as shown Figure 10 As shown, there is a gap L2 between the brush head holder 140 and the mounting portion 220, where L2 < L1. It is easy to understand that during the rotation of the electric brush provided in this embodiment, the drive unit 160 drives the brush head holder 140 to rotate the brush head assembly 200, while the housing body 120 and the cover 130 do not rotate. Therefore, there is relative rotation between the brush head holder 140 and the cover 130, and between the housing body 120 and the cover 130 and the brush head assembly 200. By creating a gap L1 between the outer casing and the mounting portion 220 along the rotation axis of the brush head holder 140, friction caused by mutual contact between the outer casing and the mounting portion 220 can be avoided, thereby reducing the rotational resistance of the brush head assembly 200 and reducing wear on the mounting portion 220 and the outer casing. After the connecting portion 230 of the brush head assembly 200 is connected to the brush head holder 140, the brush head assembly 200 and the brush head holder 140 rotate synchronously, and the brush head holder 140 is in contact with the mounting portion 220 or has a gap L2 (L2 < L1) with the mounting portion 220 along the rotation axis. Therefore, the brush head holder 140 can restrict the movement of the brush head assembly 200, reducing the deflection of the brush head assembly 200 due to force during cleaning. Deflection of the brush head assembly 200 refers to the situation where the rotation axis of the brush head assembly 200 (such as the rotation axis of the connecting portion 230) is not parallel to the rotation axis of the brush head holder 140. Under normal operating conditions, since the brush head assembly 200 rotates via the brush head holder 140, the rotation axis of the brush head assembly 200 should be parallel to the rotation axis of the brush head holder 140. Please refer to [link / reference]. Figure 8 and Figure 9 The brush head holder 140 contacts the mounting part 220; please refer to Figure 10 A gap L2, where L2 < L1, exists between the brush head holder 140 and the mounting portion 220. Because L2 < L1, the rotation of the brush head assembly can still be made smoother to a certain extent, facilitating the cleaning of stains. Furthermore, in some embodiments, such as... Figure 3 , Figure 5 and Figure 8As shown, the lower end of the brush head holder 140 has an annular plane 144, and the annular plane 144 forms an annular surface contact with the mounting portion 220. In this application, the lower end refers to the end facing the cleaning portion 210. That is, the brush head holder 140 is in contact with the mounting portion 220 in the circumferential direction of rotation. When the brush head assembly 200 tends to deflect in any direction due to force, the brush head holder 140 can provide good support to the mounting portion 220 of the brush head assembly 200, thereby reducing the deflection of the brush head assembly 200. Therefore, it can reduce vibration and noise during use of the electric brush, and the cleaning effect is also better.

[0075] In other embodiments, the lower end of the brush head holder 140 and the mounting portion 220 may also have multiple contact surfaces. The contact surfaces may be evenly distributed around the circumference in the rotation direction of the brush head holder 140, so that when the brush head assembly 200 tends to deflect in any direction due to force, the brush head holder 140 can also have a good supporting effect on the mounting portion 220 of the brush head assembly 200, thereby reducing the possibility of the brush head assembly 200 deflecting.

[0076] In some implementations, such as Figure 7 As shown, the brush head holder 140 has a second receiving cavity 141, with an opening at one end facing the cleaning part 210. A connecting part 230 extends into the second receiving cavity 141 from the opening along the rotation axis of the brush head holder 140, and is connected to the brush head holder 140. In this embodiment, the brush head assembly 200 is connected to the brush head holder 140 by extending into the second receiving cavity 141 from the opening via the connecting part 230. This makes it easier to assemble and disassemble the brush head assembly 200, facilitating replacement. Furthermore, after the connecting part 230 extends into the second receiving cavity 141, the brush head holder 140 provides a certain degree of enclosure around the connecting part 230, further limiting the deflection of the brush head assembly 200 under stress.

[0077] Optionally, the lower end of the brush head holder 140 extends out of the first receiving cavity 131, and the connecting part 230 extends into the second receiving cavity 141 from the opening by at least 5 mm, specifically 5 mm, 7 mm, 9 mm, 11 mm, etc., so that the brush head holder 140 has a better wrapping effect on the connecting part 230. Since the lower end of the brush head holder 140 extends out of the first receiving cavity 131, the size of the part of the shell body 120 with the cover 130 in the direction of the rotation axis of the brush head holder 140 can be smaller, thereby making the structure of the electric brush head more compact. It is also easier to achieve a gap between the shell and the mounting part 220 in the direction of the rotation axis of the brush head holder 140, with the brush head holder 140 and the mounting part 220 having small contact or gap, thereby achieving the purpose of more stable rotation of the brush head assembly 200, weak vibration, and low noise when the electric brush is in use.

[0078] Furthermore, the connecting part 230 can be connected to the brush head holder 140 by snap-fit, plug-in or interference fit, so as to achieve a detachable connection between the connecting part 230 and the brush head holder 140.

[0079] In some implementations, such as Figure 8 As shown, a first connector 143 can be provided in the second receiving cavity 141, and a second connector 231 can be provided in the connecting portion 230. The connecting portion 230 is connected to the brush head holder 140 by magnetic attraction between the first connector 143 and the second connector 231. Specifically, one of the first connector 143 and the second connector 231 can be a magnet, and the other can be a ferromagnetic structural component. For example, the first connector 143 can be a magnet, and the second connector 231 can be an iron, cobalt, or nickel structural component; or both the first connector 143 and the second connector 231 can be magnets; or the first connector 143 can be an iron, cobalt, or nickel structural component, and the second connector 231 can be a magnet. After the connecting portion 230 extends into the second receiving cavity 141, the brush head holder 140 is connected to the brush head assembly 200 by magnetic attraction, which makes it easy to assemble and disassemble the brush head assembly 200.

[0080] In this application, the brush head holder 140 mainly transmits torque to the brush head assembly 200. During the operation of the electric brush, the force exerted on the brush head assembly 200 in the direction of the rotation axis of the brush head holder 140 is also in the direction of the brush head holder 140, so there is no risk that the brush head assembly 200 will detach from the brush head holder 140. Therefore, even if only one of the brush head assembly 200 and the brush head holder 140 is a magnet, the magnetic connection through the ferromagnetic structure of the other can meet the needs of normal operation of the electric brush.

[0081] Furthermore, in the embodiment where the brush head holder 140 and the brush head assembly 200 are connected by magnetic force between the first connector 143 and the second connector 231, the first connector 143 and the second connector 231 can be block-shaped structural components, such as the first connector 143 being a block magnet and the second connector 231 being an iron block; or both can be ring-shaped structural components; or one of them can be a ring-shaped structural component and the other a block-shaped structural component.

[0082] To ensure a more reliable magnetic connection between the brush head holder 140 and the brush head assembly 200, such as... Figure 8 As shown, when the connecting part 230 is connected to the brush head holder 140, one side surface of the first connecting member 143 is arranged opposite to one side surface of the second connecting member 231 so that the magnetic force between the first connecting member 143 and the second connecting member 231 is greater.

[0083] In some implementations, such as Figure 8 and Figure 9 As shown, when the connecting part 230 is connected to the brush head holder 140, the lower end of the brush head holder 140 contacts the mounting part 220, and the first connecting member 143 and the second connecting member 231 have a gap in the direction of the rotation axis of the brush head holder 140. In this embodiment, when the lower end of the brush head holder 140 contacts the mounting part 220, the movement of the brush head assembly 200 in the direction of the rotation axis of the brush head holder 140 is restricted, and the gap between the first connecting member 143 and the second connecting member 231 in this direction can be maintained. That is, during the process of inserting the brush head assembly 200 into the second receiving cavity 141, the contact between the lower end of the brush head holder 140 and the mounting part 220 can play a limiting role, preventing the first connecting member 143 and the second connecting member 231 from colliding under the action of magnetic attraction, thereby effectively preventing damage to the magnet.

[0084] Furthermore, in some embodiments, the cross-sectional profiles of the connecting portion 230 and the inner sidewalls of the brush head holder 140 perpendicular to the magnetic attraction direction are both polygonal (such as quadrilaterals, hexagons, etc.), so that the brush head holder 140 drives the connecting portion 230 to rotate. The magnetic attraction direction is the direction of the magnetic force between the first connecting member 143 and the second connecting member 231 when the brush head assembly 200 is connected to the brush head holder 140; that is, the direction in which the brush head assembly 200 is inserted into the second receiving cavity 141, or the rotation axis of the brush head holder 140. In this embodiment, the cross-sectional profiles of the connecting portion 230 and the inner sidewalls of the brush head holder 140 may only be polygonal in certain locations, as long as it enables the brush head holder 140 to transmit torque to the connecting portion 230 when the brush head assembly 200 is connected to the brush head holder 140.

[0085] Optionally, such as Figure 8 and Figure 11 As shown, the connecting portion 230 is a protrusion protruding from the mounting portion 220 in a direction away from the cleaning portion 210. The outer periphery of the protrusion has a polygonal shape (such as a quadrilateral or hexagon), and the interior of the protrusion has a recessed groove in the direction towards the cleaning portion 210, into which a magnet is embedded. The second receiving cavity 141 of the brush head holder 140 is provided with a polygonal mounting groove (the shape of the mounting groove matches the shape of the protrusion). Another magnet is disposed in the mounting groove. When the brush head assembly 200 is installed, the protrusion of the connecting portion 230 is embedded in the mounting groove of the brush head holder 140, and the two magnets are magnetically connected. Furthermore, the surface of the magnet inside the protrusion can be located inside the protrusion. When the protrusion is embedded in the mounting groove for magnetic connection, the end of the protrusion contacts the bottom of the mounting groove, and there is a gap between the two magnets.

[0086] In some implementations, such as Figure 5 and Figure 7As shown, the lower end of the brush head holder 140 extends out of the first receiving cavity 131. Therefore, given a fixed size of the brush head holder 140, by extending the lower end of the brush head holder 140 out of the first receiving cavity 131, the size of the cover 130 can be reduced, thereby reducing the size of the head of the electric brush handle 100. Furthermore, the connecting portion 230 extends at least 5 mm into the second receiving cavity 141 from the opening. This allows the brush head holder 140 to have a certain wrapping effect on the connecting portion 230, thus limiting the deflection of the brush head assembly 200. This results in a smaller size for both the second receiving cavity 141 and the connecting portion 230, thereby reducing the size of the electric brush head and making the structure of the electric brush head more compact. In other embodiments, the lower end of the brush head holder 140 may not extend out of the first receiving cavity 131. For example, the lower end of the brush head holder 140 may be flush with the lower end of the cover 130, or even the lower end of the brush head holder 140 may be located within the first cavity. In the embodiment where the lower end of the brush head holder 140 extends out of the first receiving cavity 131, it is easier to achieve contact between the lower end of the brush head holder 140 and the mounting portion 220 of the brush head assembly 200, and a gap between the lower end of the cover 130 and the mounting portion 220; that is, it is relatively easy to achieve a gap between the cover 130 of the outer shell and the mounting portion 220 in the direction of the rotation axis of the brush head holder 140, and contact between the brush head holder 140 and the mounting portion 220.

[0087] In order to achieve an annular surface contact between the lower end of the brush head holder 140 and the mounting part 220, such as Figure 12 As shown, the side of the mounting part 220 where the connecting part 230 is provided has a first plane 240. It is easy to understand that the first plane 240 is also annular. The lower end of the brush head holder 140 contacts the first plane 240 to form an annular surface contact.

[0088] In some implementations, such as Figure 12 As shown, the first plane 240 is relatively large. Along the rotation axis of the brush head holder 140, the projections of the lower ends of both the brush head holder 140 and the cover 130 fall within the first plane 240. Specifically, the projection of the lower end of the brush head holder 140 refers to the projection of the annular plane 144 at the lower end of the brush head holder 140, and the projection of the lower end of the cover 130 refers to the projection of the open end 133. In this embodiment, because the first plane 240 is relatively large, it is easy to clean.

[0089] In some other embodiments, the side of the mounting portion 220 where the connecting portion 230 is located has a stepped surface. This stepped surface has a surface closer to the brush head holder 140; this surface contacts the lower end of the brush head holder 140. The stepped surface also has a surface relatively far from the brush head holder 140, and this surface has a gap with the lower end of the cover 130. In the direction of the rotation axis of the brush head holder 140, the projections of the lower ends of both the brush head holder 140 and the cover 130 fall within the stepped surface. Specifically, the projection of the lower end of the brush head holder 140 falls within a plane close to the brush head holder 140, and the projection of the lower end of the cover 130 falls on a surface of the stepped surface farther from the brush head holder 140. In this embodiment, in the direction of the rotation axis of the brush head holder 140, it is possible to better achieve a gap between the lower end of the cover 130 and the mounting portion 220, and for the lower end of the brush head holder 140 to contact the mounting portion 220. Optionally, the lower end of the cover 130 may be flush with the lower end of the brush head holder 140; or it may not be flush. As long as the lower end of the cover 130 is at a distance from the stepped surface of the mounting part 220, and the lower end of the brush head holder 140 is in contact with the stepped surface of the mounting part 220, it is within the protection scope of this application.

[0090] In other embodiments, the brush head holder 140 may also have other structural shapes; please refer to [link / reference]. Figure 5 , Figures 17 to 19 The brush head holder 140 has a first portion 146 at the upper end and a second portion 147 at the lower end. The first portion 146 is located inside the first receiving cavity 131, and the second portion 147 protrudes from the cover 130 toward the cleaning part 210 and is located outside the first receiving cavity 131. A second plane 148 is provided between the first portion 146 and the second portion 147 of the brush head holder 140. That is, in the radial direction of the brush head holder 140, the outer diameter of the first portion 146 is larger than the outer diameter of the second portion 147, thereby forming a second plane 148 between the first portion 146 and the second portion 147. The second plane 148 contacts the mounting part 220 of the brush head assembly 200; or the gap between the second plane 148 and the mounting part 220 is smaller than the gap between the cover 130 and the mounting part 220, thereby making the rotation of the brush head assembly 200 more stable and avoiding friction between the cover 130 and the brush head holder 140, so that the electric brush has weak vibration and low noise when in use.

[0091] Alternatively, please continue reading Figures 17 to 19The mounting portion 220 has a recessed groove facing the cleaning portion 210, and the connecting portion 230 is the groove wall, which is polygonal (quadrilateral or hexagonal). The second portion 147 has a recessed groove facing the second gear 152. The gear shaft of the second gear 152 passes through the first portion 146 and the second portion 147 of the brush head holder 140 and enters the bottom wall of the groove in the second portion 147. A first connector 143 is provided in the groove of the second portion 147 and is connected to the second portion 147. A second connector 231 is provided in the groove of the mounting portion 220. The outer periphery of the second part 147 has a polygonal shape that mates with the groove wall of the first part 146. When the second part 147 of the brush head holder 140 is inserted into the groove of the mounting part 220, the outer periphery of the second part 147 mates with the groove wall of the mounting part 220, achieving circumferential limiting, thereby achieving synchronous rotation between the brush head assembly 200 and the brush head holder 140. The first connector 143 and the second connector 231 are magnetically connected, achieving axial connection between the two, thereby making the connection between the brush head assembly 200 and the brush head holder 140 more secure, achieving synchronous rotation between the brush head assembly 200 and the brush head holder 140. In other embodiments, if the first connector 143 and the second connector 231 are inserted, snapped, or interference-fitted, the polygonal structure may not be provided on the groove wall (the outer periphery of the second part 147 may also not be provided with a polygonal structure), and the circumferential limiting and axial connection can be achieved directly through the connection between the first connector 143 and the second connector 231.

[0092] In some embodiments, a transmission unit 150 is connected between the drive unit 160 and the brush head holder 140, such as... Figures 6 to 8 ,and Figure 14 As shown, the transmission unit 150 includes a transmission shaft 153, a first gear 151 connected to one end of the transmission shaft 153, a second gear 152 meshing with the first gear 151, the other end of the transmission shaft 153 is connected to the drive unit 160, and the gear shaft 1521 of the second gear 152 is connected to the brush head holder 140.

[0093] Optionally, the drive unit 160 includes a motor and a reduction gear assembly. The output shaft of the motor is connected to the input shaft of the reduction gear assembly, and the output shaft of the reduction gear assembly is connected to one end of the transmission shaft 153. The other end of the transmission shaft 153 is connected to the first gear 151. The first gear 151 meshes with the second gear 152, and the gear shaft 1521 of the second gear is connected to the brush head holder 140.

[0094] Furthermore, such as Figure 1 and Figure 2As shown, the housing has a handle portion 113, a neck portion 112, and a head portion 111 arranged sequentially; in this embodiment, the brush head assembly 200 is disposed at the head portion 111 of the housing. A drive unit 160 is disposed within the handle portion 113; a drive shaft 153 is disposed within the neck portion 112; a cover 130 is disposed at the head portion 111; a first gear 151 and a second gear 152 are disposed at the head portion 111, with the first gear 151 facing the side of the cover 130 and the second gear 152 facing the closed end 132 of the cover 130; wherein, the side of the cover 130 is the outer side located between the open end 133 and the closed end 132 of the cover 130. In this embodiment, the positions of the first gear 151 and the second gear 152 are adapted to the structure of the cover 130, making the layout within the electric brush head more compact, improving the space utilization of the electric brush head, and thus making the size of the electric brush head smaller.

[0095] In other embodiments, the transmission unit 150 may also employ methods other than gear transmission to achieve transmission, such as... Figure 15 and Figure 16 In the illustrated embodiment, the transmission unit 150 uses a universal joint for transmission. Specifically, the transmission unit 150 includes a first transmission member 1541 and a second transmission member 1542 connected by a universal joint. It is easy to understand that when the first transmission member 1541 rotates, it also drives the second transmission member 1542 to rotate. The first transmission member 1541 is connected to the drive unit 160, and the second transmission member 1542 is connected to the end of the brush head holder 140 away from the cleaning section 210. The drive unit 160 can be a motor whose output motion is rotation. In this embodiment, the drive unit 160 drives the first transmission member 1541 to rotate, which in turn drives the brush head holder 140 to rotate via the second transmission member 1542. Furthermore, in some embodiments, the number of transmission members can be adjusted according to actual needs. For example, in one embodiment, a third transmission member is provided between the first transmission member 1541 and the second transmission member 1542, with one end connected to the first transmission member 1541 via a universal joint and the other end connected to the second transmission member 1542 via a universal joint.

[0096] Furthermore, in some embodiments, the connection can also be achieved by inserting the brush head holder 140 into the brush head assembly 200. For example... Figure 15 and Figure 16In the illustrated embodiment, the mounting portion 220 of the brush head assembly 200 has a recessed groove facing the cleaning portion 210 on the side facing the brush head base 140, and the connecting portion 230 is disposed within the groove. That is, the cleaning portion 210 is disposed on one side of the mounting portion 220, and the connecting portion 230 is disposed on the other side of the mounting portion 220. In this embodiment, the brush head base 140 is inserted into the groove of the brush head assembly 200 to achieve connection with the connecting portion 230. The lower end of the brush head base 140 may extend out of the first receiving cavity 131 or may not extend out of the first receiving cavity 131. The connection method between the brush head base 140 and the connecting portion 230 can be plug-in or snap-fit. In some embodiments, the brush head base 140 and the connecting portion 230 can also be magnetically connected. For example, the lower end of the brush head base 140 is provided with a first magnetic element, and the connecting portion 230 in the groove is provided with a second magnetic element. At least one of the first magnetic element and the second magnetic element is a magnet, and the other is a ferromagnetic structural element or a magnet.

[0097] The above-mentioned method of connecting the brush head holder 140 to the brush head assembly 200 is not only applicable to the implementation of the transmission unit 150 using universal joint transmission, but also applicable to the implementation of the transmission unit 150 using gear transmission and other transmission methods. As long as the solution can realize the rotation of the brush head holder 140, it is within the protection scope of this application.

[0098] To reduce friction and wear between the brush head holder 140 and the cover 130 during rotation, in some embodiments, a flange 145 is provided between the brush head holder 140 and the cover 130 in the radial direction of the rotation circumference of the brush head holder 140. It is easy to understand that the flange 145 is a structure that protrudes in the radial direction of the rotation circumference of the brush head holder 140. During the relative rotation of the brush head holder 140 and the cover 130, if either deflects, friction occurs between the flange 145 and either the brush head holder 140 or the cover 130. This limits the friction point to the location where the flange 145 is provided, thereby controlling the contact surface where friction occurs, so that even if friction occurs between the brush head holder 140 and the cover 130, the worn area is relatively small.

[0099] exist Figure 8 and Figure 9In the illustrated embodiment, the flange 145 is disposed on the outer side of the brush head holder 140 near the open end 133, and there is a gap between the outer side of the brush head holder 140 near the closed end 132 and the cover 130. In other embodiments, the flange 145 may also be disposed on the inner side of the cover 130; the flange 145 may also be a bushing sleeve fitted onto the outside of the brush head holder 140. It is easy to understand that in the embodiment where the flange 145 is disposed on the brush head holder 140, there is also a gap between the flange 145 and the cover 130; in the embodiment where the flange 145 is disposed on the cover 130, there is also a gap between the flange 145 and the brush head holder 140. Furthermore, grease can be disposed in the gap between the outer side of the brush head holder 140 near the closed end 132 and the cover 130, which can lubricate and reduce friction at the location of the flange 145. Furthermore, in the radial direction of the rotation circumference of the brush head holder 140, the size of the gap between the outer side of the brush head holder 140 near the closed end 132 and the cover 130 is 0.1-1.0 mm, specifically 0.1 mm, 0.3 mm, 0.5 mm, 0.8 mm, or 1.0 mm, to accommodate sufficient grease.

[0100] Furthermore, in the direction of the rotation axis of the brush head holder 140, the size of the flange 145 is in the range of 1-3 mm, specifically 1 mm, 2 mm, 2.5 mm, or 3 mm. This ensures that the flange 145 has a certain degree of wear resistance while minimizing the area of ​​wear, which not only makes the rotation of the brush head assembly 200 smoother but also reduces the friction between the brush head holder 140 and the cover 130.

[0101] The flange 145 can be a closed annular structure or multiple circumferentially spaced protrusions. When the flange 145 is a closed annular structure, grease can be placed in the gap between the brush head seat 140 and the cover 130 on the side of the flange 145 away from the brush head assembly 200. When the grease seeps into the location of the flange 145, it can reduce friction, and the flange 145 can effectively seal the grease in the gap.

[0102] The electric brush provided in this application embodiment includes a housing, a transmission unit 150, a brush head holder 140, and a brush head assembly 200. The housing includes a housing body 120 and a cover 130 connected to the housing body 120. The cover 130 has an open end 133 and a closed end 132, and the cover 130 has a first receiving cavity 131 inside. The closed end 132 of the cover 130 is recessed into the interior of the housing body 120, and the side of the cover 130 is located between the open end 133 and the closed end 132. The transmission unit 150 is disposed in the housing body of the head 111. The first gear 151 of the transmission unit 150 is disposed facing the side of the cover 130, and the second gear 152 of the transmission unit is disposed facing the closed end 132 of the cover 130. The brush head holder 140 is rotatably connected to the cover 130. The brush head holder 140 is located in the first receiving cavity 131 of the cover 130 and is connected to the second gear 152 so as to rotate synchronously with the second gear 152. By driving the brush head holder 140 to rotate through the gear connection, the electric brush can have weak vibration and low noise when in use. Furthermore, the brush head holder 140 has a second receiving cavity 141 inside and an opening at the lower end communicating with the second receiving cavity 141; a magnet connected to the brush head holder 140 is provided in the second receiving cavity 141; the brush head assembly 200 includes a mounting part 220, and a connecting part 230 and a cleaning part 210 located on both sides of the mounting part 220. By providing different cleaning parts 210 on the mounting part 220 (e.g., brushes of different lengths and sizes, or cloth brushes, etc., cleaning of different parts can be satisfied), and another magnet is provided on the connecting part 230. The connecting part 230 of the brush head assembly 200 extends into the second receiving cavity 141 from the opening and is magnetically connected with the magnet of the second receiving cavity 141; the magnetic connection makes it easier to replace the brush head assembly 200. When magnetically connected, there is a gap between the cover 130 and the mounting part 220, and the brush head seat 140 contacts the mounting part 220, thereby achieving smooth rotation of the brush head assembly 200, so that the electric brush has less vibration and less noise when in use.

[0103] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electric brush, characterized in that, include: The outer shell includes a shell body and a cover connected to the shell body. The cover has an open end and a closed end, the closed end of the cover is recessed into the interior of the shell body, and the interior of the cover has a first receiving cavity. The drive unit is disposed within the shell body; A brush head holder rotatably connected to the drive unit, so that the brush head holder rotates relative to the housing, and the brush head holder is disposed in the first receiving cavity; A brush head assembly includes a connecting part, a mounting part, and a cleaning part arranged sequentially; the connecting part is drivenly connected to the brush head seat from the open end so that the brush head assembly moves synchronously with the brush head seat; and in the direction of the rotation axis of the brush head seat, there is a gap L1 between the outer shell and the mounting part, and there is a gap L2 between the brush head seat and the mounting part, where L2 < L1.

2. The electric brush according to claim 1, characterized in that, The lower end of the brush head holder has an annular plane, and the annular plane forms an annular surface contact with the mounting part.

3. The electric brush according to claim 1, characterized in that, The brush head holder has a second receiving cavity, and the end of the second receiving cavity facing the cleaning part has an opening; in the direction of the rotation axis of the brush head holder, the connecting part extends into the second receiving cavity from the opening, and the connecting part is connected to the brush head holder.

4. The electric brush according to claim 3, characterized in that, The lower end of the brush head holder extends out of the first receiving cavity; the connecting part extends into the second receiving cavity from the opening by at least 5 mm.

5. The electric brush according to claim 4, characterized in that, The mounting part has a first plane on one side of the connecting part. In the direction of the rotation axis of the brush head seat, the projections of the brush head seat and the lower end of the cover body both fall within the first plane. There is a gap between the lower end of the cover body and the first plane. The lower end of the brush head seat is in contact with the first plane.

6. The electric brush according to claim 3, characterized in that, The mounting part has a stepped surface on one side of the connecting part. In the direction of the rotation axis of the brush head seat, the projections of the brush head seat and the lower end of the cover body both fall within the stepped surface. There is a gap between the lower end of the cover body and the stepped surface, and the lower end of the brush head seat is in contact with the stepped surface.

7. The electric brush according to any one of claims 3 to 6, characterized in that, A transmission unit is connected between the drive unit and the brush head holder; the transmission unit includes a drive shaft, a first gear connected to one end of the drive shaft, a second gear meshing with the first gear, the other end of the drive shaft is connected to the drive unit, and the gear shaft of the second gear is connected to the brush head holder; The outer shell has a head, a neck, and a handle portion arranged sequentially; the drive unit is disposed inside the handle portion; the transmission shaft is disposed inside the neck portion; and the cover is connected to the shell body of the head. The first gear and the second gear are disposed on the head, with the first gear facing the side of the cover and the second gear facing the closed end of the cover.

8. The electric brush according to claim 1, characterized in that, The mounting portion has a recessed groove facing the cleaning portion on the side facing the brush head seat. The connecting portion is disposed in the groove, and the brush head seat extends into the groove and is connected to the connecting portion.

9. The electric brush according to claim 8, characterized in that, A transmission unit is connected between the drive unit and the brush head base; the transmission unit includes a first transmission component and a second transmission component connected by a universal joint, the first transmission component is connected to the drive unit, and the second transmission component is connected to the end of the brush head base away from the cleaning part; the electric brush is configured such that the drive unit drives the first transmission component to rotate, and then drives the brush head base to rotate through the second transmission component.

10. The electric brush according to any one of claims 1 to 6, characterized in that, The shell body and the cover body are integrally formed and connected.

11. The electric brush according to any one of claims 1 to 6, 8, and 9, characterized in that, A flange is provided between the brush head holder and the cover body in the radial direction of the rotation circumference of the brush head holder.

12. The electric brush according to claim 11, characterized in that, The flange is a closed annular structure; or the flange is a plurality of circumferentially spaced protrusions.

13. The electric brush according to claim 11, characterized in that, The flange has a size in the range of 1-3 mm in the direction of the rotation axis of the brush head holder.

14. The electric brush according to claim 11, characterized in that, The flange is provided between the outer side of the brush head holder near the open end and the cover, and there is a gap between the outer side of the brush head holder near the closed end and the cover.

15. The electric brush according to claim 14, characterized in that, The gap is filled with grease.

16. The electric brush according to claim 15, characterized in that, In the radial direction, the size of the gap is between 0.1 and 1.0 mm.

17. The electric brush according to any one of claims 1 to 6, 8, and 9, characterized in that, The connecting part is plugged into or snapped into the brush head base to achieve a detachable connection between the connecting part and the brush head base.

18. The electric brush according to any one of claims 1 to 6, 8, and 9, characterized in that, The brush head holder is provided with a first connector, and the connecting part is provided with a second connector; one of the first connector and the second connector is a magnet, and the other is a ferromagnetic structural component; or both the first connector and the second connector are magnets.

19. The electric brush according to claim 18, characterized in that, One of the first connector and the second connector is a ring-shaped structural component, and the other is a block-shaped structural component; Alternatively, both the first connector and the second connector may be block-shaped structural components; When the brush head assembly is connected to the brush head base, one side surface of the first connector is positioned opposite to one side surface of the second connector.

20. The electric brush according to claim 18, characterized in that, The connecting part and the inner sidewall of the brush head base both have polygonal cross-sectional profiles perpendicular to the magnetic attraction direction, so that the brush head base drives the connecting part to rotate.

21. The electric brush according to any one of claims 1 to 6, 8, 9, and 12 to 16, characterized in that, The mounting part has an arc-shaped surface that protrudes away from the connecting part on the side opposite to the connecting part; the cleaning part has bristles that extend in a direction perpendicular to the arc-shaped surface.

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