Electric toothbrush

Abstract

This disclosure relates to an electric toothbrush, including a brush head and a body. The brush head includes a brush head body, a cleaning section, and a transmission section. A first end of the transmission section is movably connected to an abutment member via an elastic device, and a second end of the transmission section is configured to eccentrically engage with the cleaning section. The body is provided with a drive source and a limiting section. The brush head is configured to engage with the body at a preset angle, so that the transmission section engages with the output end of the drive source, and the abutment member is constrained by the limiting section. When the transmission section engages with the output end of the drive source, the brush head is configured to move about the rotation axis of the output end. The limiting section is located on the body within the rotation path of the abutment member, and the open end of the limiting section is provided with a guide surface. The abutment member is configured to move through the guide surface to engage with the limiting section when the brush head rotates to the corresponding position. The electric toothbrush provided by this disclosure enhances the reliability and stability of the engagement between the brush head and the body, and significantly improves cleaning efficiency.

Description

Technical Field

[0001] This disclosure relates to the field of cleaning equipment technology, specifically to an electric toothbrush. Background Technology

[0002] With the development of society, electric toothbrushes have become a popular personal oral care tool. They use a motor to drive the brush head to generate movement, which helps users remove plaque and food debris more effectively. Compared with manual toothbrushes, they have significant advantages in terms of cleaning efficiency and ease of use.

[0003] Current electric toothbrushes generally suffer from limited movement modes and low cleaning efficiency, making it difficult to effectively remove plaque from hidden areas such as between teeth and gingival sulcus, resulting in poor overall cleaning performance. Utility Model Content

[0004] In view of this, the present disclosure provides an electric toothbrush to address the technical deficiencies existing in the prior art.

[0005] To achieve the above objectives, the present disclosure adopts the following technical solution: This disclosure provides an electric toothbrush, comprising: The brush head includes a brush head body, a cleaning part, and a transmission part; the first end of the transmission part is movably connected to an abutment member via an elastic device, and the second end of the transmission part is configured to eccentrically engage with the cleaning part. The device includes a drive source and a limiting part. The output end of the drive source is configured to protrude from the device body. The brush head is configured to dock with the device body at a preset angle so that the transmission part can be driven by the output end of the drive source, thereby constraining the abutment and the limiting part. When the transmission part is driven by the drive source, its first end is constrained by the device body, and its second end drives the cleaning part to rotate. In the case where the transmission part is in transmission cooperation with the output end of the drive source, the brush head is configured to move about the rotation axis of the output end; the limiting part is provided on the machine body in the rotation path of the abutment, and the opening end of the limiting part is provided with a guide surface. The abutment is configured to move through the guide surface to cooperate with the limiting part when the brush head rotates to the corresponding position.

[0006] In one embodiment of this disclosure, the limiting portion is a groove provided on the end face of the fuselage docking end; the guiding surface is configured to extend obliquely from the end face of the fuselage docking end to communicate with the groove.

[0007] In one embodiment of this disclosure, the guide surface is configured to be disposed at least on opposite sides of the groove on the rotation path of the abutment.

[0008] In one embodiment of this disclosure, the groove is configured to extend through the sidewall of the fuselage docking end.

[0009] In one embodiment of this disclosure, when the body and the brush head are installed in place, the abutment is configured to interfere with the limiting portion.

[0010] In one embodiment of this disclosure, a shock-absorbing part is provided within the limiting part; the abutting member is configured to have an interference fit with the shock-absorbing part.

[0011] In one embodiment of this disclosure, the transmission unit includes a first transmission member and a second transmission member, wherein: the first transmission member and the second transmission member are connected by a connector and extend along the first axis; with the connector as the boundary, the first end of the second transmission member is configured to be constrained by the body through mutually cooperating abutment members and limiting parts, and the second end of the second transmission member is configured to be eccentrically engaged with the cleaning unit; the first transmission member is transmissionally connected to the output end of the drive source and is configured to, when driven by the drive source, drive the second transmission member to swing around the connector as a fulcrum, and under the constraint of the body, the second end of the first transmission member drives the cleaning unit to rotate.

[0012] In one embodiment of this disclosure, the first transmission member is configured to be connected to the output of the drive source by bonding.

[0013] In one embodiment of this disclosure, the abutment is configured to move relative to the brush head body between a first position and a second position. When the abutment is in the first position, it is configured to extend in a first direction under the force of the elastic device to engage with the limiting portion. When the abutment is in the second position, it is configured to overcome the force of the elastic device and move in a second direction opposite to the first direction.

[0014] In one embodiment of this disclosure, the abutting member includes a bushing connected to the second transmission member and an abutting rod movably connected to the cavity. The elastic device is configured to be sleeved on the abutting rod and abut against the bushing. One end of the abutting rod for cooperating with the limiting portion is configured to extend from the end of the brush head body away from the cleaning portion.

[0015] In one embodiment of this disclosure, the end of the abutment rod extending from the brush head body is provided with a ball head structure, which is configured to cooperate with the limiting portion.

[0016] In one embodiment of this disclosure, the cleaning unit includes a first brush head and a second brush head, the second brush head being configured to pivot relative to the brush head body, and the second end of the second transmission member being configured to eccentrically engage with the second brush head to drive the second brush head to rotate.

[0017] The electric toothbrush disclosed herein achieves efficient movement of the cleaning unit through the eccentric mating structure of the transmission unit and the constraint design of the limiting part and the abutment part, significantly improving cleaning efficiency. At the same time, the guide surface set at the opening end of the limiting part ensures the smoothness and accuracy of the brush head docking with the body, improving the assembly experience and system stability.

[0018] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a partial structural schematic diagram of an electric toothbrush provided in an embodiment of the present disclosure; Figure 2 This is a schematic diagram of the structure of the limiting part provided in an embodiment of this disclosure.

[0020] 1-Brush head body; 2-Cleaning section; 21-First brush head; 22-Second brush head; 3-Transmission section; 31-First transmission component; 32-Second transmission component; 4-Elastic device; 5-Abutting component; 51-Abutting rod; 52-Ball head structure; 6-Body; 7-Output end; 8-Limiting section; 9-Guide surface; 10-Shock absorption section. Detailed Implementation

[0021] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0022] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0023] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0024] 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 discussed further in subsequent figures.

[0025] The specific embodiments of this disclosure are described below with reference to the accompanying drawings.

[0026] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0027] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0028] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0029] This disclosure relates to an electric toothbrush, including a brush head and a body. The brush head includes a brush head body, a cleaning section, and a transmission section. A first end of the transmission section is movably connected to an abutment via an elastic device, and a second end of the transmission section is configured to eccentrically engage with the cleaning section. The body is provided with a drive source and a limiting section. The output end of the drive source is configured to protrude from the body, and the brush head is configured to engage with the body at a preset angle, so that the transmission section and the output end of the drive source are in transmission engagement, and the abutment and the limiting section are constrained. When the transmission section is driven by the drive source, its first end, constrained by the body, drives the cleaning section to rotate at its second end. When the transmission section and the output end of the drive source are in transmission engagement, the brush head is configured to move about the rotation axis of the output end. The limiting section is located on the body within the rotation path of the abutment, and its open end has a guide surface. The abutment is configured to move via the guide surface to engage with the limiting section when the brush head rotates to a corresponding position.

[0030] The electric toothbrush disclosed herein achieves efficient movement of the cleaning unit through the eccentric mating structure of the transmission unit and the constraint design of the limiting part and the abutment part, significantly improving cleaning efficiency. At the same time, the guide surface set at the opening end of the limiting part ensures the smoothness and accuracy of the brush head docking with the body, improving the assembly experience and system stability.

[0031] For ease of understanding, please refer to the following: Figures 1 to 2 The specific structure and working principle of the electric toothbrush disclosed herein will be described in detail with reference to the embodiments.

[0032] refer to Figure 1 This disclosure provides an electric toothbrush, including a brush head and a body 6. The brush head is a detachable component for performing the cleaning function, and mainly includes a brush head body 1, a cleaning section 2, and a transmission section 3. The brush head body 1 serves as the skeleton structure supporting the entire brush head, used to fix and connect other components. The cleaning section 2 is provided with cleaning elements such as bristles for direct contact with the tooth surface. The transmission section 3 is used to receive and convert power.

[0033] The first end of the transmission unit 3 is movably connected to the abutment member 5 via an elastic device 4, and the second end of the transmission unit 3 is configured to eccentrically engage with the cleaning unit 2. When the transmission unit 3 is driven to rotate, it causes the cleaning unit 2 to oscillate, thereby achieving efficient cleaning.

[0034] The main body 6 provides power and support. The main body 6 is equipped with a drive source and a limiting part 8. The output end 7 of the drive source is configured to protrude from the main body 6. The brush head is configured to dock with the main body 6 at a preset angle so that the transmission part 3 can be driven by the output end 7 of the drive source, and the abutment 5 can be constrained by the limiting part 8. The transmission part 3 is configured such that when driven by the drive source, its first end is constrained by the main body 6, and its second end drives the cleaning part 2 to rotate.

[0035] Among them, reference Figure 2 When the transmission part 3 is in transmission cooperation with the drive source output end 7, the brush head is configured to move about the rotation axis of the output end 7; the limiting part 8 is provided on the body 6 in the rotation path of the abutment 5, and the opening end of the limiting part 8 is provided with a guide surface 9. The abutment 5 is configured to move to cooperate with the limiting part 8 via the guide surface 9 when the brush head rotates to the corresponding position.

[0036] In the actual operation, when the user removes the brush head from the body 6 and the output end 7 of the drive source rotates relative to it, the user can connect the transmission part 3 with the output end 7 of the drive source according to the adjusted angle. However, due to the change in the installation angle, the abutting part 5 of the transmission part 3 and the limiting part 8 on the body 6 are offset, and the abutting part 5 and the limiting part 8 cannot be connected.

[0037] In this disclosed brush head, when it needs to be installed on the body 6, after the user aligns and locks the transmission part 3 and the output end 7 of the drive motor to a predetermined position according to the angle, if the relative position between the abutment 5 and the limiting part 8 changes, the abutment 5 will be pressed by the mating end plane of the body 6, causing the abutment 5 to retract into the brush head body 1. When the toothbrush is turned on, when the drive source output end 7 rotates to the return angle, the brush head will move under the action of the drive source output end 7. When the abutment 5 moves with the brush head body 1 to the position corresponding to the limiting part 8, the abutment 5 automatically pops out. A guide surface 9 is provided at the opening end of the limiting part 8, and the abutment 5 slides into the guide surface 9 and cooperates with the limiting part 8, thereby realizing the final assembly of the brush head and the body 6. Based on this, in this disclosed brush head, when the drive source output end 7 is rotated to any angle by external force, the abutment 5 can be reset to cooperate with the limiting part 8, thereby achieving a stable assembly of the brush head and the body 6. Furthermore, the guide surface 9 makes the process of the abutment 5 sliding into the limiting part 8 smoother and more efficient.

[0038] Further, refer to Figure 2 The limiting part 8 is a groove on the end face of the mating end of the body 6; the guide surface 9 is constructed to extend obliquely from the end face of the mating end of the body 6 to communicate with the groove. When the user mates the brush head with the body 6, the abutment 5 will move from a certain position on the end face of the body 6 to slide into the groove. Setting the limiting part 8 as a groove ensures that the abutment 5 slides into the groove and is constrained by the surrounding groove walls, making it difficult to easily come out, thus ensuring the stability of the connection between the brush head and the body 6 during operation and preventing loosening or abnormal noise. During the movement of the abutment 5 towards the limiting part 8, it will first contact the guide surface 9. The obliquely set guide surface 9 can guide the abutment 5 more smoothly into the limiting part 8.

[0039] Furthermore, the guide surface 9 is configured to be located on at least two opposite sides of the groove along the rotation path of the abutment 5. By configuring the guide surface 9 as bidirectional or multidirectional, it can be ensured that the abutment 5 can be smoothly guided into the groove regardless of the direction of movement.

[0040] In one embodiment of this disclosure, the groove is configured to extend through the sidewall of the housing 6. This through-type design prevents the accumulation of water and toothpaste residue. Even if liquids and contaminants enter the groove, they can easily drain from the opening in the sidewall or be washed away by water, improving the hygiene and reliability of the product.

[0041] In one specific embodiment of this disclosure, when the body 6 and the brush head are installed in place, the abutment 5 is configured to have an interference fit with the limiting part 8. Normally, during operation, if there is a certain gap between the abutment 5 and the limiting part 8, the abutment 5 and the limiting part 8 may collide, generating noise and vibration. In summary, by configuring the abutment 5 and the limiting part 8 with an interference fit, the gap between the abutment 5 and the limiting part 8 can be eliminated, preventing additional noise or vibration, thus improving the user experience and extending the product's lifespan.

[0042] To further reduce noise, a damping part 10 is provided within the limiting part 8; the abutment member 5 is configured to have an interference fit with the damping part 10. The damping part 10 can be a component made of an elastic, soft, and damping material (such as silicone, thermoplastic elastomer TPE, rubber, or soft plastic), and can cover the position within the limiting part 8 that contacts the abutment member 5. As a soft medium, the damping part 10 fills the space between the rigid limiting part 8 and the abutment member 5, absorbing noise and vibration when they come into contact. Furthermore, the deformation of the soft material can compensate for minor dimensional deviations during assembly, avoiding hard-on-hard friction and impact, and improving the overall structural durability.

[0043] In one embodiment of this disclosure, reference is made to Figure 1The transmission unit 3 includes a first transmission member 31 and a second transmission member 32, wherein: the first transmission member 31 and the second transmission member 32 are connected by a connector and extend along the first axis; with the connector as the boundary, the first end of the second transmission member 32 is configured to be constrained by the body 6 through the mutually cooperating abutment member 5 and limiting part 8, and the second end of the second transmission member 32 is configured to be eccentrically engaged with the cleaning unit 2; the first transmission member 31 is connected to the output end 7 of the drive source and is configured to drive the second transmission member 32 to swing around the connector as the fulcrum when driven by the drive source, and the second end of the first end of the second transmission member 32 drives the cleaning unit 2 to rotate under the constraint of the body 6.

[0044] Specifically, when the drive source is started, it drives the first transmission component 31 to rotate, and the first transmission component 31 drives the second transmission component 32 to move through the connecting component. Since the first end of the second transmission component 32 is constrained by the body 6, the second end of the second transmission component 32 swings with the connecting component as the fulcrum, thereby driving the cleaning part 2 to rotate.

[0045] Furthermore, the first transmission member 31 is configured to be connected to the output end 7 of the drive source by a keying method. The housing 6 contains a drive source, which may be, for example, a drive motor. The output end 7 of the drive motor can be keyed to the first transmission member 31, thereby allowing the drive motor to transmit power to the first transmission member 31. This also enables a detachable connection between the first transmission member 31 and the output end 7 of the drive motor. A corresponding keyway is provided at one end of the first transmission member 31, and the output end 7 of the drive motor can be keyed to the first transmission member 31 using methods well-known to those skilled in the art, such as flat keys, semi-circular keys, wedge keys, tangential keys, or splines.

[0046] In one embodiment of this disclosure, the abutment 5 is configured to move relative to the brush head body 1 between a first position and a second position. When the abutment 5 is in the first position, it is configured to extend in a first direction under the force of the elastic device 4 to engage with the limiting portion 8, ensuring that the brush head does not detach from the body 6 during operation. When in the second position, the abutment 5 is configured to overcome the force of the elastic device 4 and move in a second direction opposite to the first direction.

[0047] Specifically, when the user applies external force to the brush head, this force is transmitted to the abutment 5, causing it to overcome the restoring force provided by the internal elastic device 4. Starting from its extended first position, it undergoes a linear displacement and eventually stabilizes in the retracted second position. Conversely, when the external force is removed, the elastic potential energy accumulated in the elastic device 4 is released, and the resulting continuous force pushes the abutment 5 to move in the opposite direction, causing it to return from the second position to the first position and remain in that stable state.

[0048] In one embodiment of this disclosure, the abutting member 5 includes a bushing connected to the second transmission member 32 and an abutting rod 51 movably connected to the cavity. The elastic device 4 is configured to be sleeved on the abutting rod 51 and abut against the bushing. The end of the abutting rod 51 that cooperates with the limiting part 8 is configured to extend from the end of the brush head body 1 away from the cleaning part 2.

[0049] Specifically, the bushing is fixedly connected to the first end of the second transmission component 32. It can be a sleeve-shaped base structure that is press-fitted, bonded, or integrally formed onto the second transmission component 32 through interference fit, providing a supporting foundation and motion guide. The abutment rod 51 passes through the inner hole of the bushing and can slide relative to the bushing along the first axis. The bushing provides a stable guide surface for the abutment rod 51, ensuring the linear movement of the abutment rod 51, preventing uneven wear or jamming, and extending its service life. The elastic device 4 is directly sleeved on the outside of the abutment rod 51 and housed in the inner cavity of the bushing. One end of the spring abuts against the abutment rod 51, and the other end abuts against the bushing. The end of the abutment rod 51 that cooperates with the limiting part 8 extends from the end of the brush head body 1 away from the cleaning part 2, thereby realizing engagement and disengagement with the limiting part 8.

[0050] Further, refer to Figure 1 The end of the abutment rod 51 that extends out of the brush head body 1 is provided with a ball head structure 52, which is configured to cooperate with the limiting part 8.

[0051] The ball head structure 52, with its smooth hemispherical or near-spherical protrusion, can be integrally injection molded with the abutment rod 51, or fixed as a separate part to the end of the abutment rod 51 through inlay, bonding, or other methods. Correspondingly, the limiting part 8 can be configured as a ball-and-socket structure. The ball head structure 52 at one end of the abutment rod 51 ensures that the contact between the spherical surface and the limiting part 8 is a point contact or partial surface contact, significantly reducing sliding friction resistance compared to planar or cylindrical contact. This makes the abutment rod 51 engage and disengage from the limiting part 8 more smoothly and effortlessly, greatly improving the user's experience in installing and disassembling the brush head, while also reducing wear on the contact surface and extending its service life. Furthermore, the ball head structure 52 has a certain self-alignment function; even if there are minor assembly coaxiality deviations or manufacturing tolerances between the brush head and the body 6, the spherical surface can adaptively adjust the contact position through slight rolling and sliding to ensure reliable fit. Furthermore, the spherical contact helps to disperse the contact stress, avoiding excessive stress concentration at the edges, thereby reducing the risk of plastic deformation or fracture of the abutment rod 51 and the limiting part 8 due to long-term cyclic stress, and improving the reliability and durability of the product under long-term use.

[0052] In one embodiment of this disclosure, the cleaning unit 2 includes a first brush head 21 and a second brush head 22. The second brush head 22 is configured to pivot relative to the brush head body 1. The second end of the second transmission member 32 is configured to engage eccentrically with the second brush head 22 to drive the second brush head 22 to rotate.

[0053] The second brush head 22 is located at the end of the brush head body 1 furthest from the main body 6. When an external vibration source drives the first transmission component 31 to move, it causes the second transmission component 32 to oscillate at a high frequency with its connecting member as a fulcrum. The second end of the second transmission component 32 moves within a plane of a preset arc and cooperates with the second brush head 22 to drive the second brush head 22 to reciprocate. Through the dual cleaning mode of the first brush head 21 and the second brush head 22, the tooth surface and interdental spaces can be thoroughly cleaned, significantly improving cleaning efficiency.

[0054] The electric toothbrush disclosed herein achieves efficient movement of the cleaning unit 2 through the eccentric fit structure of the transmission unit 3 and the constraint design of the limiting part 8 and the abutment part 5, significantly improving cleaning efficiency. At the same time, the guide surface 9 provided at the open end of the limiting part 8 ensures the smoothness and accuracy of the brush head docking with the body 6, improving the assembly experience and system stability.

[0055] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this disclosure is not limited to the described order of actions, because according to this disclosure, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this disclosure.

[0056] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0057] The preferred embodiments disclosed above are merely illustrative of this disclosure. The optional embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this disclosure. These embodiments are selected and specifically described in this disclosure to better explain the principles and practical applications of this disclosure, thereby enabling those skilled in the art to better understand and utilize this disclosure. This disclosure is limited only by the claims and their full scope and equivalents.

Claims

1. An electric toothbrush, characterized in that, include: The brush head includes a brush head body (1), a cleaning part (2) and a transmission part (3); the first end of the transmission part (3) is movably connected to an abutment (5) via an elastic device (4), and the second end of the transmission part (3) is configured to eccentrically engage with the cleaning part (2). The body (6) is provided with a drive source and a limiting part (8). The output end (7) of the drive source is configured to protrude from the body (6). The brush head is configured to dock with the body (6) at a preset angle so that the transmission part (3) and the output end (7) of the drive source can be driven together, so that the abutment (5) and the limiting part (8) are constrained. The transmission part (3) is configured such that when driven by the drive source, its first end is constrained by the body (6), and its second end drives the cleaning part (2) to rotate. In the case where the transmission part (3) is in transmission cooperation with the output end (7) of the drive source, the brush head is configured to move about the rotation axis of the output end (7); the limiting part (8) is provided on the body (6) in the rotation path of the abutment (5), and the opening end of the limiting part (8) is provided with a guide surface (9). The abutment (5) is configured to move to cooperate with the limiting part (8) through the guide surface (9) when the brush head rotates to the corresponding position.

2. The electric toothbrush according to claim 1, characterized in that, The limiting part (8) is a groove provided on the end face of the docking end of the fuselage (6); the guiding surface (9) is configured to extend obliquely from the end face of the docking end of the fuselage (6) to communicate with the groove.

3. The electric toothbrush according to claim 2, characterized in that, The guide surface (9) is configured to be provided on at least two opposite sides of the groove on the rotation path of the abutment (5).

4. The electric toothbrush according to claim 2, characterized in that, The groove is configured to extend through the sidewall of the docking end of the fuselage (6).

5. The electric toothbrush according to claim 1, characterized in that, When the body (6) and the brush head are installed in place, the abutment (5) is configured to be interference fit with the limiting part (8).

6. The electric toothbrush according to claim 1, characterized in that, The limiting part (8) is provided with a shock-absorbing part (10); the abutting part (5) is configured to have an interference fit with the shock-absorbing part (10).

7. The electric toothbrush according to claim 1, characterized in that, The transmission part (3) includes a first transmission member (31) and a second transmission member (32), wherein: the first transmission member (31) and the second transmission member (32) are connected by a connector and extend along the first axis; with the connector as the boundary, the first end of the second transmission member (32) is configured to be constrained by the body (6) through the mutually cooperating abutment member (5) and limiting part (8), and the second end of the second transmission member (32) is configured to be eccentrically cooperating with the cleaning part (2); the first transmission member (31) is connected to the output end (7) of the drive source and is configured to drive the second transmission member (32) to swing with the connector as the fulcrum when driven by the drive source, and the second end of the second transmission member (32) drives the cleaning part (2) to rotate under the constraint of the body (6).

8. The electric toothbrush according to claim 7, characterized in that, The first transmission member (31) is configured to be connected to the output end (7) of the drive source by bonding.

9. The electric toothbrush according to claim 7, characterized in that, The abutment (5) is configured to move relative to the brush head body (1) between a first position and a second position. When the abutment (5) is in the first position, it is configured to extend in a first direction under the force of the elastic device (4) to cooperate with the limiting part (8). When it is in the second position, it is configured to overcome the force of the elastic device (4) and move in a second direction opposite to the first direction.

10. The electric toothbrush according to claim 7, characterized in that, The abutment (5) includes a bushing connected to the second transmission member (32) and an abutment rod (51) movably connected in the cavity. The elastic device (4) is configured to be sleeved on the abutment rod (51) and abut against the bushing. One end of the abutment rod (51) that cooperates with the limiting part (8) is configured to extend from the end of the brush head body (1) away from the cleaning part (2).

11. The electric toothbrush according to claim 10, characterized in that, The abutment rod (51) has a ball head structure (52) at one end extending from the brush head body (1), and the ball head structure (52) is configured to cooperate with the limiting part (8).

12. The electric toothbrush according to claim 7, characterized in that, The cleaning unit (2) includes a first brush head (21) and a second brush head (22). The second brush head (22) is configured to pivot relative to the brush head body (1). The second end of the second transmission member (32) is configured to eccentrically engage with the second brush head (22) to drive the second brush head (22) to rotate.

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