Toothbrush head assembly and electric toothbrush

Abstract

The utility model relates to a toothbrush head assembly and an electric toothbrush. The toothbrush head assembly comprises a brush handle, a driving unit and a cleaning part. The brush handle extends along a first axis; the brush handle comprises a shell which is internally provided with an inner cavity; a mounting opening is formed in the side wall of the first end of the shell; the driving unit is arranged in the inner cavity; the driving unit comprises a driving shaft extending along the first axis, a transmission mechanism connected to the first end of the driving shaft, and a rotating shaft arranged corresponding to the mounting opening; the driving shaft rotates under the driving action of the power source part and drives the transmission mechanism to rotate; the transmission mechanism drives the rotating shaft to rotate, the rotating shaft extends along a second axis, and an included angle is formed between the second axis and the first axis; the cleaning part comprises a bristle planting seat and bristles arranged on the bristle planting seat; the flocking seat is detachably connected to the rotating shaft through the mounting opening; the rotating shaft is configured to drive the cleaning part to rotate. Precise local replacement of the toothbrush head assembly is achieved, and replacement cost is saved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of oral care, and particularly relates to a toothbrush head assembly; the present disclosure also relates to an electric toothbrush. Background Art

[0002] With the improvement of living standards, people's awareness of oral care has gradually increased, and electric toothbrushes have become increasingly popular among people. In the prior art, the toothbrush head of an electric toothbrush usually performs cleaning in a swinging or rotating manner. For example, an eccentric structure is provided in the toothbrush head, and a certain angle of rotation or reciprocating movement can be achieved through the eccentric structure.

[0003] The toothbrush head has a certain service life. In order to ensure the cleaning effect of the brush head, users need to replace the toothbrush head regularly. In the prior art, it is usually necessary to replace the entire toothbrush head assembly fixed on the handle, and it is impossible to achieve more precise partial replacement, which causes a certain waste of cost. Summary of the Utility Model

[0004] The present disclosure provides a toothbrush head assembly and an electric toothbrush in order to solve the problems existing in the prior art.

[0005] According to a first aspect of the present disclosure, there is provided a toothbrush head assembly, comprising:

[0006] A brush handle extending along a first axis; the brush handle includes a housing, and an inner cavity is provided in the housing; an installation opening is formed on the side wall of the first end of the housing.

[0007] A driving unit disposed in the inner cavity; the driving unit includes a driving shaft extending along the first axis, a transmission mechanism connected to the first end of the driving shaft, and a rotating shaft corresponding to the installation opening; the driving shaft is configured to rotate under the driving action of a power source member and drive the transmission mechanism to rotate; the transmission mechanism is configured to drive the rotating shaft to rotate, the rotating shaft extends along a second axis, and an included angle exists between the second axis and the first axis.

[0008] A cleaning part, including a hair implanting base and bristles provided on the hair implanting base; the hair implanting base is detachably connected to the rotating shaft through the installation opening; the rotating shaft is configured to drive the cleaning part to rotate.

[0009] In an embodiment of the present disclosure, the included angle between the second axis and the first axis is 90 degrees.

[0010] In an embodiment of the present disclosure, the transmission mechanism includes a driving gear drivingly connected to the driving shaft and a driven gear drivingly connected to the rotating shaft; the driving gear meshes with the driven gear for transmission, and the driving gear rotates under the driving of the driving shaft and drives the driven gear to rotate.

[0011] In an embodiment of the present disclosure, an assembly hole is provided on the driven gear, and the rotating shaft is configured to penetrate through the assembly hole; a position on the rotating shaft corresponding to the assembly hole is configured as a rough surface for interference fit with the assembly hole.

[0012] In an embodiment of the present disclosure, a limiting pressing piece is sleeved on the rotating shaft; the limiting pressing piece covers above the driven gear and has a predetermined gap with the driven gear; the limiting pressing piece is configured to limit the degrees of freedom of the driven gear and the rotating shaft to move along the second axis.

[0013] In an embodiment of the present disclosure, a plurality of slots distributed in the circumferential direction are provided on the side wall of the limiting pressing piece, and a plurality of limiting ribs respectively cooperating with the slots are provided on the inner wall of the brush handle; the limiting ribs are configured to limit the rotational degrees of freedom of the limiting pressing piece in the inner cavity.

[0014] In an embodiment of the present disclosure, a shaft sleeve is provided in the inner cavity, and the shaft sleeve is installed in the brush handle with interference, and the interference amount is configured to be 0.1 - 0.2 mm; a shaft hole facing the installation port is provided at the top end of the shaft sleeve, and the bottom end of the rotating shaft is configured to extend into the shaft hole and is configured to have a clearance fit with the shaft hole.

[0015] In an embodiment of the present disclosure, the bottom end of the rotating shaft is configured to be spherical.

[0016] In an embodiment of the present disclosure, a through hole is provided on the hair implanting seat; a screw hole is provided at the top end of the rotating shaft; the cleaning part is detachably connected to the rotating shaft by a screw.

[0017] In an embodiment of the present disclosure, the through hole includes a first section adjacent to the bristles and a second section away from the bristles; the diameter of the first section is larger than that of the second section, and a step surface is formed between the first section and the second section; in the installation state, the head of the screw presses on the step surface.

[0018] In an embodiment of the present disclosure, the through hole is located at the central position of the hair implanting seat; the through hole is configured to have a gap of 0.05 - 0.15 mm with the screw.

[0019] In one embodiment of the present disclosure, the extending direction of the thread on the inner wall of the screw hole is opposite to the rotation direction of the rotating shaft.

[0020] In one embodiment of the present disclosure, a connecting member for externally connecting the power source member is provided at one end of the driving shaft away from the transmission mechanism; the power source member is a driving motor, and a connecting groove is provided on the output shaft of the driving motor; a connecting rib is provided on the connecting member, and the connecting rib is configured to extend into the connecting groove so that the output shaft drives the driving shaft to rotate synchronously.

[0021] In one embodiment of the present disclosure, the cleaning part rotates 360 degrees under the driving action of the rotating shaft.

[0022] According to a second aspect of the present disclosure, there is also provided an electric toothbrush, including:

[0023] A handle, the handle includes a driving motor;

[0024] The toothbrush head assembly provided according to the first aspect of the present disclosure, the toothbrush head assembly is provided at the end of the handle; the driving shaft of the toothbrush head assembly is configured to be connected to the output shaft of the driving motor.

[0025] One beneficial effect of the present disclosure is that the cleaning part is detachably connected to the rotating shaft through the mounting opening, thereby realizing the precise local replacement of the toothbrush head assembly. Under the driving action of the power source member, the driving shaft can drive the transmission mechanism to rotate, the transmission mechanism drives the rotating shaft to rotate, and further drives the cleaning part mounted on the rotating shaft to rotate, thereby achieving the cleaning effect. When the toothbrush head assembly is used for a period of time, the user does not need to replace the whole toothbrush head assembly, but can only replace the cleaning part, thus saving the replacement cost.

[0026] Through the following detailed description of the exemplary embodiments of the present disclosure with reference to the accompanying drawings, other features and advantages of the present disclosure will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present disclosure and, together with the description, are used to explain the principles of the present disclosure.

[0028] Figure 1 is a schematic structural diagram of an electric toothbrush provided by an embodiment of the present disclosure;

[0029] Figure 2 is a front view of a toothbrush head assembly provided by an embodiment of the present disclosure;

[0030] Figure 3 is a cross-sectional view of a toothbrush head assembly provided by an embodiment of the present disclosure;

[0031] Figure 4It is a partial cross-sectional view of a toothbrush head assembly provided by an embodiment of the present disclosure;

[0032] Figure 5 It is a partial cross-sectional view of the toothbrush head assembly after the screw is removed provided by an embodiment of the present disclosure;

[0033] Figure 6 It is an exploded view of the toothbrush head assembly provided by an embodiment of the present disclosure;

[0034] Figure 7 It is a schematic structural view of the limit pressing piece provided by an embodiment of the present disclosure;

[0035] Figure 8 It is a schematic structural view of the screw provided by an embodiment of the present disclosure;

[0036] Figure 9 It is a schematic structural view of the rotating shaft provided by an embodiment of the present disclosure;

[0037] Figure 10 It is a schematic structural view of the driven gear provided by an embodiment of the present disclosure.

[0038] Figures 1 to 10 The one-to-one correspondence between the names of the components and the reference numerals in the following is as follows:

[0039] 100, toothbrush head assembly; 1, brush handle; 10, connection end; 11, outer shell; 12, inner cavity; 13, installation opening; 14, limit rib; 2, drive shaft; 21, connecting piece; 31, driving gear; 32, driven gear; 321, assembly hole; 4, rotating shaft; 41, rough surface; 42, screw hole; 5, limit pressing piece; 51, slot; 6, shaft sleeve; 61, shaft hole; 7, cleaning part; 71, hair implanting seat; 710, through hole; 711, first section; 712, second section; 72, bristles; 8, screw; 81, head; 811, screwing groove; 200, handle. Detailed implementation manners

[0040] Now, various exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of the components and steps set forth in these embodiments, numerical expressions and values do not limit the scope of the present disclosure.

[0041] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way limits the present disclosure, its application or use.

[0042] Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the specification.

[0043] It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof in subsequent figures is not necessary.

[0044] In this document, terms such as "upper", "lower", "front", "rear", "left", and "right" are only used to represent the relative positional relationship between relevant parts, rather than defining the absolute positions of these relevant parts.

[0045] In this document, terms such as "first" and "second" are only used to distinguish between each other, rather than indicating importance, order, or a prerequisite for each other's existence, etc.

[0046] In this document, terms such as "equal" and "same" are not strict mathematical and / or geometric limitations, but also include allowable errors that can be understood by those skilled in the art and are permitted in manufacturing or use, etc.

[0047] Reference Figure 1 and Figure 2 to this, the present disclosure provides a toothbrush head assembly 100, which can be mounted on a handle 200 to form an electric toothbrush. The toothbrush head assembly 100 includes: a brush handle 1, a drive unit, and a cleaning part 7. Among them, as Figure 2 shown, the brush handle 1 is the main structure of the toothbrush head assembly 100, which extends along a first axis. Referring to Figure 3 this, the brush handle 1 includes a housing 11, and there is an inner cavity 12 inside the housing 11. Referring to Figure 6 this, an installation opening 13 is formed on the side wall of the first end of the housing 11. Specifically, the installation opening 13 is used for installing the cleaning part 7. Referring to Figure 2 the view direction, the upper side is the first end, and the lower end of the brush handle 1 is denoted as a connection end 10. The connection section 10 can be used to connect to the handle 200 to form a complete electric toothbrush.

[0048] The drive unit is disposed in the inner cavity 12. As Figure 2 shown, the drive unit includes a drive shaft 2 extending along the first axis, a transmission mechanism connected to the first end of the drive shaft 2, and a rotating shaft 4 disposed corresponding to the installation opening 13. The drive shaft 2 is configured to rotate under the driving action of a power source member and drive the transmission mechanism to rotate; the transmission mechanism is configured to drive the rotating shaft 4 to rotate. The rotating shaft 4 extends along a second axis, and there is an included angle between the second axis and the first axis.

[0049] Among them, the power source member can be a drive motor disposed in the handle 200, and the drive motor has an output shaft extending to be connected to the drive shaft 2. In a specific embodiment of the present disclosure, as Figure 3As shown, the end of the drive shaft 2 away from the transmission mechanism is provided with a connector 21 for connecting to an external power source. The output shaft of the drive motor is provided with a connecting groove. The connector 21 is provided with a connecting rib, which is configured to extend into the connecting groove so that the output shaft drives the drive shaft 2 to rotate synchronously. The connecting end 10 of the brush handle 1 can be provided with an opening, and the output shaft can pass through the handle 200 and extend into the inner cavity 12 through the opening, thereby engaging with the connector 21. The connecting rib on the connector 21 can be snapped into the connecting groove on the output shaft, so that when the output shaft rotates, it can drive the drive shaft 2 to rotate synchronously.

[0050] The transmission mechanism disclosed herein can perform both transmission and steering functions. Specifically, the drive shaft 2 can rotate about a first axis under driving action, and the transmission mechanism changes the direction of rotation, thereby enabling the rotating shaft 4 to rotate about a second axis. The transmission mechanism can have various specific transmission forms, such as a gear mechanism, a connecting rod mechanism, a flexible member mechanism, etc., and this disclosure does not specifically limit these.

[0051] In a specific embodiment of the present disclosure, the angle between the second axis and the first axis is 90 degrees. Figure 3 、 Figure 4 and Figure 6 The transmission mechanism includes a driving gear 31 in transmission connection with the drive shaft 2, and a driven gear 32 in transmission connection with the rotating shaft 4. The driving gear 31 and the driven gear 32 are meshed and driven. Driven by the drive shaft 2, the driving gear 31 rotates, and in turn, the driven gear 32 rotates. The drive shaft 2 can drive the driving gear 31 to rotate about a first axis. The driving gear 31 and the driven gear 32 form a vertical gear set. Under the meshing transmission, the driving gear 31 drives the driven gear 32 to rotate about a second axis.

[0052] Furthermore, if Figure 10 As shown, the driven gear 32 is provided with an assembly hole 321, which is specifically located at the center of the driven gear 32 and passes through the driven gear 32 along the second axis. Figure 4 As shown, the rotating shaft 4 is constructed to pass through the assembly hole 321, as shown in FIG. Figure 9 As shown, the location on the rotating shaft 4 corresponding to the assembly hole 321 is configured as a rough surface 41, which provides an interference fit with the assembly hole 321. The rough surface 41 can be a straight strip. The provision of the rough surface 41 increases the friction between the rotating shaft 4 and the inner wall of the assembly hole 321. The diameter of the assembly hole 321 can be smaller than the diameter of the rotating shaft 4 at the location where the rough surface 41 is located, thereby achieving an interference fit. The driven gear 32 can drive the rotating shaft 4 to rotate about the second axis.

[0053] The specific structure and working mode of the transmission mechanism in this embodiment are introduced above. The transmission mechanism can transmit the driving force of the driving shaft 2 to the rotating shaft 4, thereby driving the rotating shaft 4 to rotate around the second direction. The cleaning part 7 can be installed on the rotating shaft 4, thereby driving the cleaning part 7 to rotate. Specifically, as Figure 3 shown, the cleaning part 7 includes a hair planting base 71 and bristles 72 arranged on the hair planting base 71. The bristles 72 are used to contact the teeth to achieve the brushing function.

[0054] The hair planting base 71 is detachably connected to the rotating shaft 4 through the mounting port 13, and the rotating shaft 4 is configured to drive the cleaning part 7 to rotate. The rotating shaft 4 rotating around the second axis can drive the hair planting base 71 to rotate together, thereby driving the bristles 72 to rotate to automatically clean the teeth. The rotating shaft 4 can drive the cleaning part 7 to reciprocally swing at a certain angle. For example, it can swing reciprocally at 60 degrees, 90 degrees, etc. Preferably, the cleaning part 7 rotates 360 degrees under the driving of the rotating shaft 4, thereby maximizing the rotation angle, improving the cleaning effect, and better meeting the needs of different users.

[0055] In the present disclosure, the cleaning part 7 is detachably connected to the rotating shaft 4 through the mounting port 13, thereby realizing the precise local replacement of the toothbrush head assembly 100. Under the driving of the power source component, the driving shaft 2 can drive the transmission mechanism to rotate, the transmission mechanism drives the rotating shaft 4 to rotate, and further drives the cleaning part 7 installed on the rotating shaft 4 to rotate, thereby achieving the cleaning effect. When the toothbrush head assembly 100 is used for a period of time, the user does not need to replace the entire toothbrush head assembly 100, but can only replace the cleaning part 7, thereby saving the replacement cost.

[0056] The present disclosure does not specifically limit the way of detachably connecting the hair planting base 71 to the rotating shaft 4. For example, it can be detachably connected by means of snap connection, magnetic attraction, screw connection, etc. In an embodiment of the present disclosure, as Figure 4 shown, through holes 710 are provided on the hair planting base 71. Specifically, the through holes 710 can be located at the central position of the hair planting base 71; as Figure 9 shown, screw holes 42 are provided at the top end of the rotating shaft 4, and the cleaning part 7 is detachably connected to the rotating shaft 4 through screws 8. The through holes 710 extend along the second axis. By not implanting the bristles 72 in the through holes 710 provided on the hair planting base 71, the through holes 710 can be exposed. Referring to Figure 8 , one end of the screw 8 without threads is a head 81 with a relatively large diameter. A screwing groove 811 is provided on the top surface of the head 81. The screwing groove 811 can be configured as a cross shape or a straight shape, so that a conventional screwdriver can be used for disassembly and installation.

[0057] In a specific embodiment of the present disclosure, the through hole 710 is configured to have a gap of 0.05 - 0.15 millimeters from the screw 8. Thus, when the screw 8 rotates driven by the rotating shaft 4, there will be no tight friction between the inner wall of the through hole 710 and the screw 8, thereby preventing resistance to rotation.

[0058] The screw 8 can be made of stainless steel. It can be understood that during the process of brushing teeth, the hair implanting base 71 will be covered with liquid, and the screw 8 installed in the through hole 710 will often come into contact with the liquid. The screw 8 made of stainless steel is not easy to rust when encountering water, the thread will not fail, and the screw 8 can work properly for a long time.

[0059] When installing the cleaning part 7, the user can place the cleaning part 7 at the position corresponding to the installation opening 13 and align the screw 8 with the through hole 710. Then the user can screw the screw 8 downward. The screw 8 penetrates through the through hole 710 and extends into the installation opening 13, and then is screwed into the screw hole 42 on the rotating shaft 4. In this way, the cleaning part 7 is installed on the rotating shaft 4, and the rotating shaft 4 can drive the cleaning part 7 to rotate together. When disassembling the cleaning part 7, the user only needs to screw out the screw 8 to release the connection between the hair implanting base 71 and the rotating shaft 4, and then the cleaning part 7 can be easily removed.

[0060] In a specific embodiment of the present disclosure, as Figure 5 shown, the through hole 710 includes a first section 711 adjacent to the bristles 72 and a second section 712 away from the bristles 72. The diameter of the first section 711 is larger than that of the second section 712, and a stepped surface is formed between the first section 711 and the second section 712. Referring to Figure 4 , in the installed state, the head 81 of the screw 8 is pressed against the stepped surface, so that part of the hair implanting base 71 is clamped between the head of the screw 8 and the outer shell 11 of the brush handle 1, thereby playing a role in limiting the hair implanting part 71 in the second axis direction. In the installed state, the cleaning part 7 can only rotate together with the rotating shaft 4 and will not move in the second axis direction, thus ensuring the safety of tooth brushing.

[0061] In a specific embodiment of the present disclosure, the extending direction of the thread on the inner wall of the screw hole 42 is opposite to the rotating direction of the rotating shaft 4. For example, when the rotating shaft 4 rotates in the clockwise direction during normal operation, the extending direction of the thread on the inner wall of the screw hole 42 is counterclockwise, and the extending direction of the thread of the screw 8 is adapted thereto; vice versa, when the rotating shaft 4 rotates in the counterclockwise direction, the extending direction of the thread on the inner wall of the screw hole 42 is clockwise. By providing a reverse thread on the inner wall of the screw hole 42, the cleaning part 7 will not become looser and looser during the working rotation process, playing a role in preventing it from loosening naturally.

[0062] In one embodiment of the present disclosure, reference is made to Figure 4 A limiting pressing piece 5 is sleeved on a rotating shaft 4. The limiting pressing piece 5 covers above a driven gear 32 and has a predetermined gap from the driven gear 32. The limiting pressing piece 5 is configured to limit the freedom of movement of the driven gear 32 and the rotating shaft 4 along a second axis. The limiting pressing piece 5 can be sleeved on the rotating shaft 4 and is fixed above the driven gear 32 by cold pressing. The predetermined gap between it and the driven gear 32 can avoid causing resistance to the rotation of the driven gear 32. The limiting pressing piece 5 can block the movement of the driven gear 32 along the second axis, and the rotating shaft 4 in interference fit with the driven gear 32 will not move along the second axis either.

[0063] In a specific embodiment of the present disclosure, as Figure 7 shown, a plurality of slots 51 distributed in a circumferential direction are provided on the side wall of the limiting pressing piece 5. In this embodiment, four slots 51 are provided, and the four slots 51 are evenly distributed in the circumferential direction on the side wall of the limiting pressing piece 5. As Figure 4 and Figure 6 shown, a plurality of limiting ribs 14 respectively cooperating with the slots 51 are provided on the inner wall of the brush handle 1. When four slots 51 are provided, four limiting ribs 14 can also be correspondingly provided. The limiting ribs 14 are configured to limit the rotational freedom of the limiting pressing piece 5 in the inner cavity 12. When the limiting pressing piece 5 is inserted into the inner cavity 12 from the installation opening 13, the four slots 51 respectively cooperate with the four limiting ribs 14, and the limiting ribs 14 perform circumferential limiting on the limiting pressing piece 5, so that the limiting pressing piece 5 will not rotate after being installed, improving the fixing effect of the limiting pressing piece 5.

[0064] In one embodiment of the present disclosure, reference is made to Figure 4 and Figure 6 An axle sleeve 6 is provided in the inner cavity 12. The axle sleeve 6 is installed in the brush handle 1 with an interference fit, and the interference amount is configured to be 0.1 - 0.2 mm. A shaft hole 61 facing the installation opening 13 is provided at the top of the axle sleeve 6. The bottom of the rotating shaft 4 is configured to extend into the shaft hole 61 and is configured to have a clearance fit with the shaft hole 61. The axle sleeve 6 is fixed at a position corresponding to the installation opening 13 in the brush handle 1, and its top shaft hole 61 faces the installation opening 13, so that the rotating shaft 4 installed in the shaft hole 61 faces the installation opening 13. The axle sleeve 6 is used to position the rotating shaft 4. The rotating shaft 4 has a clearance fit with the inner wall of the shaft hole 61, so that the rotating shaft 4 will not be rubbed by the inner wall of the shaft hole 61, the axle sleeve 6 will not cause resistance to the rotation of the rotating shaft 4, and the rotating shaft 4 can rotate smoothly.

[0065] Furthermore, as Figure 9As shown, the bottom end of the rotating shaft 4 is configured in a ball head shape. The bottom end of the rotating shaft 4 extends into the shaft hole 61, and there may be a certain amount of friction between it and the bottom of the shaft sleeve 6. In this embodiment, the bottom end of the rotating shaft 4 is designed in a ball head shape, thereby reducing the friction between the bottom of the rotating shaft 4 and the bottom of the shaft sleeve 6 and improving the smoothness of the rotation of the rotating shaft 4.

[0066] The present disclosure also provides an electric toothbrush, including a toothbrush head assembly 100 and a handle 200. Among them, the handle 200 includes a driving motor, and the toothbrush head assembly 100 is arranged at the end of the handle 200; the driving shaft 2 of the toothbrush head assembly 100 is configured to be connected to the output shaft of the driving motor. The entire structure of the toothbrush head assembly 100 and its connection manner with the handle 200 have been described in detail above and will not be elaborated here.

[0067] The embodiments of the present disclosure have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other ordinary technical personnel in the technical field to understand the disclosed embodiments. The scope of the present disclosure is defined by the appended claims.

Claims

1. A toothbrush head assembly, characterized in that, Comprising: A brush handle (1) extending along a first axis; the brush handle (1) includes a housing (11) having an inner cavity (12) therein; an installation opening (13) is formed on the side wall of the first end of the housing (11). A drive unit disposed in the inner cavity (12); the drive unit includes a drive shaft (2) extending along the first axis, a transmission mechanism connected to the first end of the drive shaft (2), and a rotating shaft (4) corresponding to the installation opening (13); the drive shaft (2) is configured to rotate under the driving action of a power source member and drive the transmission mechanism to rotate; the transmission mechanism is configured to drive the rotating shaft (4) to rotate, the rotating shaft (4) extends along a second axis, and there is an included angle between the second axis and the first axis. A cleaning part (7) including a hair planting base (71) and bristles (72) disposed on the hair planting base (71); the hair planting base (71) is detachably connected to the rotating shaft (4) through the installation opening (13); the rotating shaft (4) is configured to drive the cleaning part (7) to rotate.

2. The toothbrush head assembly according to claim 1, wherein The included angle between the second axis and the first axis is 90 degrees.

3. The toothbrush head assembly according to claim 2, wherein The transmission mechanism includes a driving gear (31) in transmission connection with the drive shaft (2) and a driven gear (32) in transmission connection with the rotating shaft (4); the driving gear (31) meshes with the driven gear (32) for transmission, and the driving gear (31) rotates under the driving action of the drive shaft (2) and drives the driven gear (32) to rotate.

4. The toothbrush head assembly according to claim 3, wherein, An assembly hole (321) is provided on the driven gear (32), and the rotating shaft (4) is configured to penetrate through the assembly hole (321); a rough surface (41) is configured at a position on the rotating shaft (4) corresponding to the assembly hole (321) for interference fit with the assembly hole (321).

5. The toothbrush head assembly according to claim 4, wherein, A limiting pressing piece (5) is sleeved on the rotating shaft (4); the limiting pressing piece (5) covers above the driven gear (32) and has a predetermined gap with the driven gear (32); the limiting pressing piece (5) is configured to limit the degrees of freedom of the driven gear (32) and the rotating shaft (4) to move along the second axis.

6. The toothbrush head assembly according to claim 5, characterized in that, A plurality of groove positions (51) distributed in the circumferential direction are provided on the side wall of the limiting pressing piece (5), and a plurality of limiting ribs (14) respectively cooperating with the groove positions (51) are provided on the inner wall of the brush handle (1); the limiting ribs (14) are configured to limit the rotational degrees of freedom of the limiting pressing piece (5) in the inner cavity (12).

7. The toothbrush head assembly according to claim 1, wherein, A shaft sleeve (6) is disposed in the inner cavity (12), the shaft sleeve (6) is installed in the brush handle (1) with interference, and the interference amount is configured to be 0.1 - 0.2 mm; a shaft hole (61) facing the installation opening (13) is provided at the top end of the shaft sleeve (6), and the bottom end of the rotating shaft (4) is configured to extend into the shaft hole (61) and is configured to have a clearance fit with the shaft hole (61).

8. The toothbrush head assembly according to claim 7, wherein, The bottom end of the rotating shaft (4) is configured to be in a ball head shape.

9. The toothbrush head assembly according to claim 1, wherein, A through hole (710) is provided on the hair implanting base (71); a screw hole (42) is provided at the top end of the rotating shaft (4); the cleaning part (7) is detachably connected to the rotating shaft (4) by a screw (8).

10. The toothbrush head assembly according to claim 9, wherein, The through hole (710) includes a first section (711) adjacent to the bristles (72) and a second section (712) away from the bristles (72); the diameter of the first section (711) is larger than that of the second section (712), and a stepped surface is formed between the first section (711) and the second section (712); in the installed state, the head (81) of the screw (8) is pressed against the stepped surface.

11. The toothbrush head assembly according to claim 9, wherein, The through hole (710) is located at the central position of the hair implanting base (71); the through hole (710) is configured to have a gap of 0.05 - 0.15 mm from the screw (8).

12. The toothbrush head assembly according to claim 9, wherein, The extending direction of the thread on the inner wall of the screw hole (42) is opposite to the rotating direction of the rotating shaft (4).

13. The toothbrush head assembly according to claim 1, wherein A connecting member (21) for externally connecting the power source member is provided at one end of the driving shaft (2) away from the transmission mechanism; the power source member is a driving motor, and a connecting groove is provided on the output shaft of the driving motor; a connecting rib is provided on the connecting member (21), and the connecting rib is configured to extend into the connecting groove so that the output shaft drives the driving shaft (2) to rotate synchronously.

14. The toothbrush head assembly according to claim 1, wherein, The cleaning part (7) rotates 360 degrees under the driving of the rotating shaft (4).

15. An electric toothbrush, characterized in that, Comprising: A handle (200), the handle (200) includes a driving motor; The toothbrush head assembly (100) according to any one of claims 1 to 14, the toothbrush head assembly (100) is provided at the end of the handle (200); the driving shaft (2) of the toothbrush head assembly (100) is configured to be connected to the output shaft of the driving motor.

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