Brush head and electric toothbrush

Abstract

The utility model relates to a brush head and an electric toothbrush, the electric toothbrush comprises a holding part and the brush head, the brush head comprises a brush head body and a transmission assembly, the brush head body extends along a first axis, and the brush head body is provided with a first cleaning unit and a second cleaning unit which extend along the first axis; each of the first cleaning unit and the second cleaning unit is provided with two opposite ends, and one end of each of the first cleaning unit and the second cleaning unit is configured to be in elastic contact with the brush head body through an elastic device; the transmission assembly is configured to extend in the brush head body to be matched with the other ends of the first cleaning unit and the second cleaning unit; when the transmission assembly is driven to rotate back and forth in the brush head body, torque is alternately applied to the other ends of the first cleaning unit and the second cleaning unit, so that the first cleaning unit and the second cleaning unit correspondingly and alternately rotate back and forth. According to the brush head and the electric toothbrush, the two cleaning units alternately rotate in a reciprocating mode, and efficient and comprehensive cleaning is achieved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of cleaning equipment, and more specifically, to a brush head and an electric toothbrush. Background Art

[0002] As a modern oral care tool, electric toothbrushes usually use batteries or charging methods to drive the brush head, performing multiple motion modes such as vibration and rotation to improve the effect of cleaning teeth and oral cavity, surpassing traditional manual brushing methods.

[0003] While modern electric toothbrushes have achieved significant improvements in cleaning efficiency through designs like high-frequency sonic vibrations and reciprocating rotation, they still have functional limitations. Teeth are complex structures, consisting of smooth tooth surfaces and hard-to-reach areas like gaps between teeth and gum sulci. Relying on a single motion pattern alone makes it difficult to fully penetrate these subtle areas, especially those difficult-to-reach gaps between teeth and the junction between teeth and gums, making thorough cleaning often difficult. Utility Model Content

[0004] In view of this, the embodiments of the present disclosure provide a brush head and an electric toothbrush to solve the technical defects existing in the prior art.

[0005] To achieve the above objectives, the present disclosure adopts the following technical solutions:

[0006] According to a first aspect of the present disclosure, the present disclosure provides a brush head, comprising:

[0007] A brush head body extends along a first axis, and is provided with a first cleaning unit and a second cleaning unit extending along the first axis, the first cleaning unit and the second cleaning unit being configured to be hinged to the brush head body respectively; along the extension direction of the first axis, the first cleaning unit and the second cleaning unit each have opposite ends, wherein one end of the first cleaning unit and the second cleaning unit is configured to elastically contact the brush head body through an elastic device;

[0008] A transmission assembly is constructed to extend within the brush head body to cooperate with the other ends of the first cleaning unit and the second cleaning unit; when the transmission assembly is driven to rotate back and forth within the brush head body, torque is alternately applied to the other ends of the first cleaning unit and the second cleaning unit to cause the first cleaning unit and the second cleaning unit to rotate back and forth alternately accordingly.

[0009] In one embodiment of the present disclosure, the transmission assembly is configured to be capable of reciprocating rotation with the second axis as the rotation center line:

[0010] The transmission assembly is constructed so that when it rotates in a first direction with the second axis as the rotation center line, at least part of the rotation action applies torque to the other end of the first cleaning unit, and is constructed so that when it rotates in a second direction with the second axis as the rotation center line, at least part of the rotation action applies torque to the other end of the second cleaning unit.

[0011] In one embodiment of the present disclosure, the transmission assembly is constructed to drive the first cleaning unit to rotate during the process of rotating from the reset position along the first direction with the second axis as the rotation center line, and when the transmission assembly rotates along the second direction with the second axis as the rotation center line to the reset position, the first cleaning unit is constructed to reset under the elastic action of the elastic device; the transmission assembly is constructed to drive the second cleaning unit to rotate during the process of rotating from the reset position along the second direction with the second axis as the rotation center line, and when the transmission assembly rotates along the first direction with the second axis as the rotation center line to the reset position, the second cleaning unit is constructed to reset under the elastic action of the elastic device.

[0012] In one embodiment of the present disclosure, the transmission assembly is configured to drive the first cleaning unit to deflect to a first predetermined position when rotating in a first direction to a first position, and the second cleaning unit is configured to be reset under the action of an elastic device; the transmission assembly is configured to drive the second cleaning unit to deflect when rotating from the first position to the second direction, and the first cleaning unit is configured to move in the reset direction under the action of the elastic device;

[0013] The transmission assembly is configured to drive the second cleaning unit to deflect to a second predetermined position when rotating in the second direction to the second position, and the first cleaning unit is configured to be reset under the action of the elastic device; the transmission assembly is configured to drive the first cleaning unit to deflect when rotating from the second position to the first direction, and the second cleaning unit is configured to move in the reset direction under the action of the elastic device.

[0014] In one embodiment of the present disclosure, the transmission assembly is a transmission rod, and the other ends of the first cleaning unit and the second cleaning unit are configured to be located in a rotation path of an end portion of the transmission rod.

[0015] In one embodiment of the present disclosure, the brush head body has a first inner cavity and a second inner cavity, the first inner cavity is configured to accommodate the first cleaning unit and the second cleaning unit, the transmission rod is located in the second inner cavity, and the end of the transmission rod is configured to extend out of the second inner cavity and cooperate with the other end of the first cleaning unit and the second cleaning unit in the first inner cavity.

[0016] In one embodiment of the present disclosure, the first cleaning unit and the second cleaning unit are configured to be connected in the first inner cavity of the brush head body via the same rotating shaft:

[0017] When the transmission rod is driven to reciprocate in the brush head body, torque is alternately applied to the other ends of the first cleaning unit and the second cleaning unit, so that the first cleaning unit and the second cleaning unit rotate alternately and reciprocally around the rotating shaft.

[0018] In one embodiment of the present disclosure, the elastic device includes a first elastic component pre-pressed between the cavity wall of the first inner cavity and the first cleaning unit, and a second elastic component pre-pressed between the cavity wall of the first inner cavity and the second cleaning unit.

[0019] In one embodiment of the present disclosure, the first cleaning unit includes a first base and bristles, and the second cleaning unit includes a second base and bristles, and along the extension direction of the first axis, the first base and the second base each have opposite ends, wherein one end of the first base and the second base is constructed to elastically contact the brush head body through an elastic device, and the other end is constructed to cooperate with the transmission assembly.

[0020] In one embodiment of the present disclosure, among the planes containing the first axis, at least one plane is a symmetry plane, so that the first cleaning unit and the second cleaning unit are mirror-symmetrically arranged with the symmetry plane as a reference plane; and / or, the first base and the second base are mirror-symmetrically arranged with the symmetry plane as a reference plane; and / or, the brush head body is mirror-symmetrically arranged with the symmetry plane as a reference plane; and / or, the transmission assembly is mirror-symmetrically arranged with the symmetry plane as a reference plane; and / or, the transmission rod is mirror-symmetrically arranged with the symmetry plane as a reference plane.

[0021] In one embodiment of the present disclosure, the symmetry plane is perpendicular to the bottom surfaces of the first base and the second base.

[0022] In one embodiment of the present disclosure, the mating parts of the transmission rod, the first base, and the second base are all planes; when the transmission rod is in the reset position, the planes of the mating parts of the first base, the second base, and the transmission rod are parallel.

[0023] In one embodiment of the present disclosure, along the extension direction of the first axis, the rotating shaft is located between contact positions of the elastic component, the transmission rod, and the first cleaning unit and the second cleaning unit.

[0024] In one embodiment of the present disclosure, one end of the transmission rod away from the first cleaning unit and the second cleaning unit is constructed into a cylindrical shape having a transmission cavity; the transmission cavity is configured to be transmission-connected to an external power source.

[0025] In one embodiment of the present disclosure, a flange is provided at one end of the transmission rod away from the first cleaning unit and the second cleaning unit, and a limiting groove is provided on the inner wall of the second inner cavity. The flange is located in the limiting groove and is constructed to rotate in the limiting groove with the second axis as the rotation center line.

[0026] In one embodiment of the present disclosure, a step surface is provided on the inner wall of the second inner cavity, and a fixing member is also included in the second inner cavity, and the end face of the fixing member and the step surface form the limiting groove; the fixing member is constructed to have a hollow cavity connected to the transmission cavity, and the external power source is constructed to pass through the hollow cavity and connect with the transmission cavity.

[0027] According to a second aspect of the present disclosure, the present disclosure provides an electric toothbrush, comprising:

[0028] a grip portion configured for gripping;

[0029] As described above, the brush head is configured to be mounted on the grip portion via a fixing member.

[0030] The brush head provided by the present disclosure is provided with a first cleaning unit and a second cleaning unit on the brush head body. The first cleaning unit and the second cleaning unit are elastically contacted with the brush head body through an elastic device. The transmission assembly cooperates with the first cleaning unit and the second cleaning unit, so that the first cleaning unit and the second cleaning unit can realize alternating reciprocating rotation, penetrate into the gaps between teeth and areas such as the gingival sulcus to perform cleaning actions, thereby realizing comprehensive and efficient cleaning of the teeth.

[0031] The electric toothbrush provided by the present disclosure includes a grip portion and a brush head as described above, which can achieve efficient and comprehensive cleaning of teeth.

[0032] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic structural diagram of a brush head provided by an embodiment of the present disclosure;

[0034] Figure 2 is a structural schematic diagram of a brush head provided by another embodiment of the present disclosure;

[0035] Figure 3 This is a front view of a brush head provided by an embodiment of the present disclosure;

[0036] Figure 4 is a left side view of a brush head provided in one embodiment of the present disclosure;

[0037] Figure 5is a right side view of a brush head provided in one embodiment of the present disclosure;

[0038] Figure 6 is a bottom view of a brush head provided in one embodiment of the present disclosure;

[0039] Figure 7 is a top view of a brush head provided in one embodiment of the present disclosure;

[0040] Figure 8 is a schematic diagram of the motion state of a brush head provided by an embodiment of the present disclosure;

[0041] Figure 9 is a schematic diagram of the motion state of a brush head provided by an embodiment of the present disclosure;

[0042] Figure 10 It is a schematic diagram of the motion state of the brush head provided in one embodiment of the present disclosure.

[0043] 1-brush head body; 11-first inner cavity; 12-second inner cavity; 2-first cleaning unit; 21-first base; 3-second cleaning unit; 31-second base; 4-elastic device; 41-first elastic component; 42-second elastic component; 5-transmission component; 50-transmission rod; 51-flange; 52-transmission cavity; 6-brush filament; 7-rotating shaft; 8-fixing part. DETAILED DESCRIPTION

[0044] 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 of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0045] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0046] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0047] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0048] The specific embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0049] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0050] In this article, "first", "second", etc. are only used to distinguish each other, and do not indicate the importance and order, or the prerequisite for each other's existence.

[0051] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0052] The present disclosure provides a brush head, comprising a brush head body and a transmission assembly, wherein the brush head body extends along a first axis, and is provided with a first cleaning unit and a second cleaning unit extending along the first axis on the brush head body, the first cleaning unit and the second cleaning unit being hingedly connected to the brush head body, respectively. The first cleaning unit and the second cleaning unit each have opposite ends in a direction extending along the first axis, wherein one end of each of the first cleaning unit and the second cleaning unit is configured to elastically contact the brush head body via an elastic device, thereby achieving a composite motion of cross-swinging of the first cleaning unit and the second cleaning unit.

[0053] The transmission assembly extends within the brush head body to engage with the other ends of the first cleaning unit and the second cleaning unit. When the transmission assembly is driven to rotate back and forth within the brush head body, it alternately applies torque to the other ends of the first cleaning unit and the second cleaning unit, thereby causing the first cleaning unit and the second cleaning unit to rotate back and forth alternately.

[0054] The brush head provided by the present disclosure has a first cleaning unit and a second cleaning unit hinged on the brush head body. One end of the first cleaning unit and the second cleaning unit are elastically contacted with the brush head body through an elastic device, and the transmission assembly cooperates with the other end of the first cleaning unit and the second cleaning unit, so that the first cleaning unit and the second cleaning unit form a seesaw-like structure, realizing alternating reciprocating rotation of the two cleaning units, thereby achieving comprehensive and efficient cleaning of the teeth.

[0055] The present disclosure provides an electric toothbrush, comprising a grip portion and a brush head as described above, wherein the grip portion is configured to be gripped, and the brush head is configured to be mounted on the grip portion via a fixing member.

[0056] The electric toothbrush provided by the present disclosure includes a grip portion and a brush head as described above, which can achieve efficient and comprehensive cleaning of teeth.

[0057] For ease of understanding, refer to Figures 1 to 10 , the specific structure and working principle of the brush head and electric toothbrush disclosed in the present invention are explained in detail with reference to an embodiment.

[0058] refer to Figure 1The present disclosure provides a brush head, comprising a brush head body 1 and a transmission assembly 5. The brush head body 1 is in the shape of an elongated strip, and the brush head body 1 extends along a first axis. The brush head body 1 has two opposite ends, at one of which a first cleaning unit 2 and a second cleaning unit 3 extending along the first axis are provided. The first cleaning unit 2 and the second cleaning unit 3 are respectively hinged on the brush head body 1, so that the first cleaning unit 2 and the second cleaning unit 3 can swing relative to the brush head body 1. That is, the first cleaning unit 2 and the second cleaning unit 3 are consistent with the extension direction of the brush head body 1, and the two cleaning units form a seesaw-like structure on the brush head body 1, so that they can swing around their hinged position in a direction perpendicular to the first axis. In the extension direction along the first axis, the first cleaning unit 2 and the second cleaning unit 3 each have opposite ends, wherein one end of the first cleaning unit 2 and the second cleaning unit 3 are elastically in contact with the brush head body 1 through an elastic device 4.

[0059] The transmission assembly 5 extends within the brush head body 1 to engage with the other ends of the first cleaning unit 2 and the second cleaning unit 3. When the transmission assembly 5 is driven to rotate back and forth within the brush head body 1, it alternately applies torque to the other ends of the first cleaning unit 2 and the second cleaning unit 3, causing the first cleaning unit 2 and the second cleaning unit 3 to rotate back and forth alternately.

[0060] During the reciprocating rotation, the transmission assembly 5 will alternately apply a swinging torque to the other end of the first cleaning unit 2 and the second cleaning unit 3. For example, when the transmission assembly 5 swings in one direction, it can gradually push the first cleaning unit 2 to swing relative to the brush head body 1, and gradually move away from the second cleaning unit 3, so that the second cleaning unit 3 can be reset under the action of the elastic device 4; when the transmission assembly 5 swings in the other direction, it can gradually push the second cleaning unit 3 to swing relative to the brush head body 1, and gradually move away from the first cleaning unit 2, so that the first cleaning unit 2 can be reset under the action of the elastic device 4. This alternating reciprocating motion realizes the alternating swinging of the two cleaning units 2. It should be noted that during the reciprocating rotation of the transmission assembly 5, the timing of the swinging and resetting of the first cleaning unit 2 and the second cleaning unit 3 is related to the relative positions among the transmission assembly 5, the first cleaning unit 2, and the second cleaning unit 3. Different settings will result in different timings for the swinging and resetting of the first cleaning unit 2 and the second cleaning unit 3.

[0061] The brush head disclosed herein is provided with a first cleaning unit 2 and a second cleaning unit 3 on a brush head body 1. One end of the first cleaning unit 2 and the second cleaning unit 3 is elastically contacted with the brush head body 1 through an elastic device 4, and a transmission assembly 5 cooperates with the other ends of the first cleaning unit 2 and the second cleaning unit 3, so that the first cleaning unit 2 and the second cleaning unit 3 can rotate back and forth alternately, thereby achieving comprehensive and efficient cleaning of the teeth.

[0062] In one embodiment of the present disclosure, the transmission assembly 5 is configured to be capable of reciprocating rotation about the second axis as the rotation center line. When the transmission assembly 5 rotates in a first direction about the second axis as the rotation center line, at least part of the rotational action applies a torque to the other end of the first cleaning unit 2, and when the transmission assembly 5 rotates in a second direction about the second axis as the rotation center line, at least part of the rotational action applies a torque to the other end of the second cleaning unit 3.

[0063] Specifically, the second axis can be coaxial or non-coaxial with the first axis. Figure 1 、 Figure 2 , the transmission assembly 5 is constructed to extend along the first axis direction of the brush head body 1. At this time, the second axis direction of the transmission assembly 5 is the same as the first axis direction of the brush head body 1. The transmission assembly 5 is rotatably connected to the brush head body 1, so that the transmission assembly 5 can reciprocate with the second axis as the rotation center line, for example, first rotating along the first direction, and then continuing to rotate along the second direction opposite to the first direction, forming a cyclic alternating reciprocating motion pattern. The first direction of the present disclosure can be counterclockwise, and the second direction can be clockwise. Of course, the first direction can also be clockwise, and the first direction can also be counterclockwise. As long as the transmission assembly 5 reciprocates with the second axis as the rotation center line, it will not affect the technical solution of the present disclosure.

[0064] In a specific embodiment of the present disclosure, when the transmission assembly 5 rotates along the first direction, part of the rotational action will be converted into the application of torque to the other end of the first cleaning unit 2, and when the transmission assembly 5 rotates along the second direction, that is, in the direction opposite to the first direction, part of the rotational action will be converted into the application of torque to the other end of the second cleaning unit 3.

[0065] For example, reference Figures 8 to 10When the transmission assembly 5 rotates clockwise, since the first cleaning unit 2 is located in the rotation path of the transmission assembly 5, the partial rotation of the transmission assembly 5 will cause the other end of the first cleaning unit 2 to move downward. When the transmission assembly 5 rotates counterclockwise, since the second cleaning unit 3 is located in the rotation path of the transmission assembly 5, the partial rotation will cause the other end of the second cleaning unit 3 to move downward. Due to the reciprocating rotation characteristics of the transmission assembly 5, the first cleaning unit 2 and the second cleaning unit 3 can alternately move along a predetermined motion trajectory, which not only increases cleaning efficiency but also ensures that the two cleaning units do not apply pressure to the same area at the same time, helping to reduce damage to the cleaning surface and providing a more uniform cleaning effect.

[0066] In the present disclosure, "partial action" means that the transmission component 5 does not continuously apply torque to the first cleaning unit 2 and the second cleaning unit 3 during the rotation process. For example, when the transmission component 5 is in the initial position, it is disengaged from the first cleaning unit 2 and the second cleaning unit 3. At this time, the transmission component 5 first needs to rotate until it contacts the first cleaning unit 2 or the second cleaning unit 3, and then it can push the first cleaning unit 2 or the second cleaning unit 3 to move during the continued rotation. Of course, when the transmission component 5 is in the initial position, it can also be in contact or abutment with the first cleaning unit 2 and the second cleaning unit 3. In this structure, as long as the transmission component 5 moves, the torque will be directly transmitted to the first cleaning unit 2 and the second cleaning unit 3, and there will be no intermediate state where contact is not maintained.

[0067] In one embodiment of the present disclosure, the transmission assembly 5 is constructed to drive the first cleaning unit 2 to rotate during the process of rotating from the reset position along the first direction with the second axis as the rotation center line. When the transmission assembly 5 rotates along the second direction with the second axis as the rotation center line to the reset position, the first cleaning unit 2 is constructed to be reset under the elastic action of the elastic device 4; the transmission assembly 5 is constructed to drive the second cleaning unit 3 to rotate during the process of rotating from the reset position along the second direction with the second axis as the rotation center line. When the transmission assembly 5 rotates along the first direction with the second axis as the rotation center line to the reset position, the second cleaning unit 3 is constructed to be reset under the elastic action of the elastic device 4.

[0068] Specifically, the transmission assembly 5, the first cleaning unit 2, and the second cleaning unit 3 all have reset positions. When the transmission assembly 5 rotates from the reset position in a first direction (e.g., counterclockwise) about the second axis, the transmission assembly 5 drives the first cleaning unit 2 to rotate. At this point, the first cleaning unit 2 performs a cleaning operation driven by the transmission assembly 5. When the transmission assembly 5 rotates to its maximum angle in the first direction, the first cleaning unit 2 is driven to its maximum position. Thereafter, when the transmission assembly 5 returns to the reset position in a second direction (e.g., clockwise), the first cleaning unit 2 is no longer driven by the transmission assembly 5 and returns to its initial position under the elastic force of the elastic device 4. Similarly, after the transmission assembly 5 returns in the second direction (e.g., clockwise), it continues to rotate in the second direction (e.g., clockwise) about the second axis, driving the second cleaning unit 3 to perform a cleaning operation. The transmission assembly 5 then returns in the first direction (e.g., clockwise), and the second cleaning unit 3 similarly returns to its initial position under the force of the elastic device 4. Based on this, the first cleaning unit 2 and the second cleaning unit 3 can perform cleaning actions in an alternating manner. The elastic force provided by the elastic device 4 enables the first cleaning unit 2 and the second cleaning unit 3 to return to their original positions when not driven by the transmission component 5, so that this alternating working mode can be carried out continuously to achieve efficient and comprehensive cleaning.

[0069] In one embodiment of the present disclosure, the transmission assembly 5 is configured to drive the first cleaning unit 2 to deflect to a first predetermined position when it rotates in a first direction to a first position, and the second cleaning unit 3 is configured to be reset under the action of the elastic device 4; the transmission assembly 5 is configured to drive the second cleaning unit 3 to deflect when it rotates from the first position to the second direction, and the first cleaning unit 2 is configured to move in the reset direction under the action of the elastic device 4.

[0070] The transmission assembly 5 is configured to drive the second cleaning unit 3 to deflect to the second predetermined position when it rotates in the second direction to the second position, and the first cleaning unit 2 is configured to be reset under the action of the elastic device 4; the transmission assembly 5 is configured to drive the first cleaning unit 2 to deflect when it rotates from the second position to the first direction, and the second cleaning unit 3 is configured to move in the reset direction under the action of the elastic device 4.

[0071] Specifically, in this embodiment, whether in the reset position or during alternating motion, the first cleaning unit 2 and the second cleaning unit 3 are in different positions. That is, whether in the reset position or during motion, the transmission assembly always applies rotational torque to one of the cleaning units, and there is no intermediate state where no torque is applied. When the transmission assembly 5 begins to rotate in a first direction (e.g., counterclockwise), it contacts the first cleaning unit 2 and causes the first cleaning unit 2 to deflect toward the first predetermined position. Simultaneously, as the transmission assembly 5 rotates in the first direction away from the second cleaning unit 3, the second cleaning unit 3 begins to return to its initial position under the action of the elastic device 4. When the transmission assembly 5 begins to rotate in a second direction (e.g., clockwise) from the first position, it directly causes the second cleaning unit 3 to deflect, and the first cleaning unit 2 begins to return to its initial position under the action of the elastic device 4.

[0072] When the transmission assembly 5 continues to rotate in the second direction (e.g., clockwise) to the second position, the second cleaning unit 3 is driven by the transmission assembly 5 and deflected to the second predetermined position, while the first cleaning unit 2 is reset to its initial position under the action of the elastic device 4. When the transmission assembly 5 rotates in the first direction (e.g., counterclockwise) from the second position, it causes the first cleaning unit 2 to deflect, and the second cleaning unit 3 begins to reset toward its initial position under the action of the elastic device 4. While the transmission assembly 5 is causing one cleaning unit to deflect, the other cleaning unit can also reset in a timely manner, thus ensuring the continuity of the alternating cleaning actions performed by the cleaning units.

[0073] In one embodiment of the present disclosure, the transmission assembly 5 is a transmission rod 50 , and the other ends of the first cleaning unit 2 and the second cleaning unit 3 are configured to be located in a rotation path of an end portion of the transmission rod 50 .

[0074] Specifically, refer to Figure 1 and Figure 2 The transmission assembly 5 is a transmission rod 50 rotatably connected to the brush head body 1. One end of the transmission rod 50 is connected to an external power source, and the other end is used to drive the cleaning units to perform cleaning operations. The ends of the transmission rod 50 rotate according to a predetermined rotation path and interact with the other ends of the first cleaning unit 2 and the second cleaning unit 3. When the end of the transmission rod 50 rotates in a first direction, it contacts the other end of the first cleaning unit 2, thereby causing the first cleaning unit 2 to deflect. When the end of the transmission rod 50 rotates in a second direction, it contacts the other end of the second cleaning unit 3, thereby causing the second cleaning unit 3 to deflect.

[0075] In one embodiment of the present disclosure, the brush head body 1 has a first inner cavity 11 and a second inner cavity 12, the first inner cavity 11 is configured to accommodate the first cleaning unit 2 and the second cleaning unit 3, the transmission rod 50 is located in the second inner cavity 12, and the end of the transmission rod 50 is configured to extend out of the second inner cavity 12 and cooperate with the other end of the first cleaning unit 2 and the second cleaning unit 3 in the first inner cavity 11.

[0076] Specifically, refer to Figure 1 The brush head body 1 has a first inner cavity 11 and a second inner cavity 12. The first inner cavity 11 is used to accommodate the first cleaning unit 2 and the second cleaning unit 3. The first cleaning unit 2 and the second cleaning unit 3 have a gap from the inner wall of the first inner cavity 11 to ensure that the first cleaning unit 2 and the second cleaning unit 3 have space to perform the required deflection and cleaning actions. The second inner cavity 12 is used to accommodate the transmission rod 50. The length of the second inner cavity 12 is greater than that of the first inner cavity 11 to match the shape of the transmission rod 50, and the inner wall of the second inner cavity 12 has a gap from the transmission rod 50 to facilitate the transmission rod 50 to complete its preset motion trajectory in the second inner cavity 12. The transmission rod 50 is located at the center of the second inner cavity 12, and the end of the transmission rod 50 extends out of the second inner cavity 12 and cooperates with the other end of the first cleaning unit 2 and the second cleaning unit 3 in the first inner cavity 11. By placing the cleaning units and the transmission rod 50 in different inner cavities, it can be ensured that each component can perform its actions in its own dedicated space.

[0077] In one embodiment of the present disclosure, the first cleaning unit 2 and the second cleaning unit 3 are configured to be connected in the first inner cavity 11 of the brush head body 1 via the same rotating shaft 7 .

[0078] When the transmission rod 50 is driven to rotate back and forth in the brush head body 1 , torque is alternately applied to the other ends of the first cleaning unit 2 and the second cleaning unit 3 , so that the first cleaning unit 2 and the second cleaning unit 3 rotate back and forth alternately around the rotating shaft 7 .

[0079] Specifically, refer to Figures 1 to 3 The first cleaning unit 2 and the second cleaning unit 3 are connected to the first inner cavity 11 of the brush head body 1 by sharing the same rotating shaft 7, allowing the first cleaning unit 2 and the second cleaning unit 3 to rotate around a common axis. This simplifies the internal structure of the brush head body 1, reduces the number of components, and ensures the stability and coordination of the cleaning units. During the reciprocating rotation of the transmission rod 50, the end of the transmission rod 50 alternately applies torque to the other end of the first cleaning unit 2 and the second cleaning unit 3, causing the first cleaning unit 2 and the second cleaning unit 3 to rotate alternately around the rotating shaft 7.

[0080] In one embodiment of the present disclosure, the elastic device 4 includes a first elastic component 41 pre-pressed between the cavity wall of the first inner cavity 11 and the first cleaning unit 2 , and a second elastic component 42 pre-pressed between the cavity wall of the first inner cavity 11 and the second cleaning unit 3 .

[0081] Specifically, refer to Figure 2 , the first elastic component 41 is pre-stressed between the cavity wall of the first inner cavity 11 and the first cleaning unit 2. When the first cleaning unit 2 is pushed by the transmission component 5 to perform a cleaning action, the first elastic component 41 will be compressed; and when the cleaning unit needs to be reset, the first elastic component 41 will release the elastic restoring force to push the first cleaning unit 2 back to its initial position, ready for the next cleaning. Similarly, the second elastic component 42 is pre-stressed between the cavity wall of the first inner cavity 11 and the second cleaning unit 3. The second elastic component 42 is responsible for the resetting action of the second cleaning unit 3. When the transmission component 5 does not apply torque, the second cleaning unit 3 can be reset under the action of the second elastic component 42. The elastic device 4 can ensure that the cleaning unit automatically resets when it is not driven by the transmission rod 50, thereby realizing efficient alternating operation of the cleaning unit. The elastic device 4 enables the cleaning unit to be slightly deformed according to the shape and hardness of the cleaning surface to adapt to different cleaning conditions and improve the uniformity and thoroughness of cleaning.

[0082] In one embodiment of the present disclosure, the first cleaning unit 2 includes a first base 21 and a bristle 6, and the second cleaning unit 3 includes a second base 31 and a bristle 6. Along the extension direction of the first axis, the first base 21 and the second base 31 have opposite ends, wherein one end of the first base 21 and the second base 31 are constructed to elastically contact with the brush head body 1 through the elastic device 4, and the other end are constructed to cooperate with the transmission assembly 5.

[0083] Specifically, refer to Figure 2 and Figure 6 The first cleaning unit 2 includes a first base 21 and a brush filament 6 attached thereto. Similarly, the second cleaning unit 3 also includes a second base 31 and a brush filament 6 attached thereto. In the direction extending along the first axis, one end of the first base 21 and the second base 31 achieves elastic contact with the brush head body 1 through the elastic device 4 to adapt to different cleaning surfaces, while ensuring that they can be quickly reset when not in use. The other ends of the first base 21 and the second base 31 cooperate with the transmission assembly 5. When the transmission assembly 5 rotates back and forth in the brush head body 1, it alternately applies torque to the other ends of the first cleaning unit 2 and the second cleaning unit 3, pushing them to rotate alternately back and forth around the rotating shaft 7, while the brush filaments 6 attached to the base clean the cleaning surface.

[0084] In one embodiment of the present disclosure, among the planes including the first axis, at least one plane is a symmetry plane, so that the first cleaning unit 2 and the second cleaning unit 3 are mirror-symmetrically arranged with the symmetry plane as the reference plane; and / or, the first base 21 and the second base 31 are mirror-symmetrically arranged with the symmetry plane as the reference plane; and / or, the brush head body 1 is mirror-symmetrically arranged with the symmetry plane as the reference plane; and / or, the transmission assembly 5 is mirror-symmetrically arranged with the symmetry plane as the reference plane; and / or, the transmission rod 50 is mirror-symmetrically arranged with the symmetry plane as the reference plane.

[0085] Specifically, refer to Figures 4 to 7 At least one of the planes containing the first axis is a plane of symmetry, and this plane of symmetry serves as a reference plane, enabling the first cleaning unit 2, the second cleaning unit 3, and other related components to be arranged in mirror-image symmetry. With this plane of symmetry as a reference, the first cleaning unit 2 and the second cleaning unit 3 are completely symmetrical in shape, size, and position. Similarly, the first base 21 and the second base 31 can also be arranged in mirror-image symmetry relative to the plane of symmetry, with the bottom surfaces of the first base 21 and the second base 31 lying in the same plane, parallel to the plane of symmetry, ensuring structural consistency. The brush head body 1 can also be arranged in mirror-image symmetry relative to the plane of symmetry, with the two sides of the brush head body 1 symmetrical in shape and structure. The transmission assembly 5 can also follow the principle of symmetry, ensuring mirror-image symmetry relative to the plane of symmetry. The transmission rod 50 can also be mirror-image symmetric relative to the plane of symmetry, ensuring that its spatial layout and function are consistent with the other components on both sides of the plane of symmetry. The symmetrical design helps ensure the balance of the brush head body 1 and its internal components during movement, reduces vibration and noise, improves overall stability, and enhances the product's aesthetic appeal. By symmetrically arranging the first cleaning unit 2 and the second cleaning unit 3 , it is possible to ensure that their movements during reciprocating rotation are more coordinated, thereby improving the cleaning efficiency.

[0086] In one embodiment of the present disclosure, the symmetry plane is perpendicular to the bottom surfaces of the first base 21 and the second base 31 .

[0087] Specifically, the bottom surfaces of the first base 21 and the second base 31 are perpendicular to the symmetry plane. This perpendicular relationship between the symmetry plane and the bottom surfaces of the bases helps ensure the structural balance of the brush head body 1 during movement, reduces vibration and noise, and improves overall stability. It also ensures that the first cleaning unit 2 and the second cleaning unit 3 can move more coordinated and consistent, thereby improving cleaning efficiency.

[0088] In one embodiment of the present disclosure, the mating parts of the transmission rod 50, the first base 21, and the second base 31 are all planes; when the transmission rod 50 is in the reset position, the planes of the mating parts of the first base 21, the second base 31 and the transmission rod 50 are parallel.

[0089] Specifically, refer to Figure 9 , the end of the transmission rod 50 is designed to be flat so as to cooperate with the first base 21 and the second base 31. The mating surface of the first base 21 and the second base 31 is also designed to be flat to ensure good contact with the transmission rod 50. When the transmission rod 50 is in the reset position, the planes at which the first base 21 and the second base 31 mate with the transmission rod 50 remain parallel, and these planes remain aligned even when no torque is applied, ensuring stable contact between the transmission assembly 5 and the cleaning unit. The plane matching design helps to improve the contact stability between the transmission rod 50 and the cleaning unit, reduce shaking and deviation during movement, reduce friction between the transmission rod 50 and the cleaning unit, thereby reducing wear and extending the service life of the equipment. In addition, when the planes at which the transmission rod 50 mates with the cleaning unit remain parallel, the transmission rod 50 can apply torque more accurately, ensuring that the cleaning unit can move according to a predetermined trajectory.

[0090] In one embodiment of the present disclosure, along the extension direction of the first axis, the rotating shaft 7 is located between the contact positions of the elastic component, the transmission rod 50 , and the first cleaning unit 2 and the second cleaning unit 3 .

[0091] Specifically, the rotating shaft 7 is located between the first cleaning unit 2 and the second cleaning unit 3, and is positioned along the first axis between the contact points between the elastic assembly and the transmission rod 50 and the first cleaning unit 2 and the second cleaning unit 3. Placing the rotating shaft 7 between the elastic assembly and the transmission rod 50 helps ensure the balance of the cleaning units during movement, ensuring that the cleaning units remain stable during rotation and reducing unnecessary shaking. The position of the rotating shaft 7 ensures that the transmission rod 50 can effectively transmit torque to the cleaning units, thereby driving their alternating reciprocating rotation.

[0092] In one embodiment of the present disclosure, one end of the transmission rod 50 away from the first cleaning unit 2 and the second cleaning unit 3 is constructed into a cylindrical shape having a transmission cavity 52; the transmission cavity 52 is configured to be transmission-connected to an external power source.

[0093] Specifically, refer to Figure 1 、 Figure 2The end of the transmission rod 50 away from the cleaning unit is cylindrical. This design facilitates a stable connection with an external power source and also facilitates the integration of a transmission chamber 52. A transmission chamber 52 is located within the cylindrical end and is used for transmission connection with an external power source (such as an electric motor). The transmission chamber 52 serves as an interface between the transmission rod 50 and the external power source, ensuring smooth and efficient power transmission from the external power source to the transmission rod 50. The cylindrical design and internal transmission chamber 52 help improve the stability of the connection between the transmission rod 50 and the external power source, reducing shaking and vibration during operation. The external power source inputs power into the transmission rod 50 through the connection with the transmission chamber 52. After receiving power, the transmission rod 50 can reciprocate along the second axis within the brush head body 1, that is, rotate in one direction for a certain angle and then rotate in the opposite direction. As the transmission rod 50 rotates, it alternately applies torque to the other ends of the first cleaning unit 2 and the second cleaning unit 3, causing the cleaning units to rotate alternately back and forth around the rotating shaft 7.

[0094] In one embodiment of the present disclosure, a circle of flange 51 is provided at one end of the transmission rod 50 away from the first cleaning unit 2 and the second cleaning unit 3, and a limiting groove is provided on the inner wall of the second inner cavity 12. The flange 51 is located in the limiting groove and is constructed to rotate in the limiting groove with the second axis as the rotation center line.

[0095] See also Figure 1 , a circle of flange 51 is provided at one end of the transmission rod 50 away from the first cleaning unit 2 and the second cleaning unit 3, and this flange 51 is designed to cooperate with the limiting groove of the external power source. A limiting groove is provided on the inner wall of the second inner cavity 12, and this limiting groove matches the shape of the flange 51, ensuring that the flange 51 can rotate smoothly therein. The cooperation between the flange 51 and the limiting groove ensures a stable connection between the transmission rod 50 and the external power source, reducing shaking and vibration during rotation. The flange 51 is located in the limiting groove and is constructed to rotate with the second axis as the center line, ensuring that the transmission rod 50 can accurately rotate back and forth according to the predetermined trajectory. The limiting groove not only provides a stable guide, but also ensures that the rotation direction of the transmission rod 50 is correct, avoiding the transmission rod 50 from deviating from the predetermined path during rotation.

[0096] Specifically, the external power source is connected to the flange 51 of the transmission rod 50 through the second inner cavity 12, inputting power into the transmission rod 50. After obtaining power, the transmission rod 50 can reciprocate along the second axis within the brush head body 1. When the transmission rod 50 rotates, it alternately applies torque to the other ends of the first cleaning unit 2 and the second cleaning unit 3, causing the cleaning units to rotate alternately back and forth around the rotating shaft 7. Through the structure of the flange 51 and the limiting groove, the transmission rod 50 can achieve good cooperation with the external power source, ensuring that the cleaning units can perform cleaning actions efficiently.

[0097] In one embodiment of the present disclosure, a step surface is provided on the inner wall of the second inner cavity 12, and a fixing member 8 is also included which is installed in the second inner cavity 12, and the end face of the fixing member 8 and the step surface form a limiting groove; the fixing member 8 is constructed as a hollow cavity connected to the transmission cavity 52, and the external power source is constructed to pass through the hollow cavity and connect to the transmission cavity 52.

[0098] See also Figure 1 A step surface is provided on the inner wall of the second inner cavity 12, and the step surface is used to cooperate with the end face of the fixing member 8 to form a limiting groove. The fixing member 8 is installed in the second inner cavity 12, and its end face and the step surface form a limiting groove, ensuring that the flange 51 of the transmission rod 50 can rotate smoothly in the limiting groove. The fixing member 8 is constructed to have a hollow cavity connected to the transmission cavity 52. ​​The design of this hollow cavity allows the external power source to pass through it and connect to the transmission cavity 52. ​​The limiting groove formed by the step surface and the end face of the fixing member 8 ensures a stable connection between the transmission rod 50 and the external power source, reducing shaking and vibration during rotation. The flange 51 is located in the limiting groove and is constructed to rotate with the second axis as the center line, ensuring that the transmission rod 50 can accurately reciprocate according to the predetermined trajectory. The limiting groove not only provides stable guidance, but also ensures that the rotation direction of the transmission rod 50 is correct, preventing the transmission rod 50 from deviating from the predetermined path during rotation.

[0099] Specifically, the external power source passes through the hollow cavity of the fixing member 8 and is connected to the transmission cavity 52, inputting power into the transmission rod 50. After obtaining power, the transmission rod 50 can reciprocate along the second axis within the brush head body 1. When the transmission rod 50 rotates, it alternately applies torque to the other ends of the first cleaning unit 2 and the second cleaning unit 3, causing the cleaning units to rotate alternately back and forth around the rotating shaft 7. Through the structure of the step surface, the fixing member 8 and the hollow cavity, the transmission rod 50 can achieve good cooperation with the external power source, ensuring that the cleaning units can perform cleaning actions efficiently.

[0100] The brush head provided by the present disclosure is provided with a first cleaning unit 2 and a second cleaning unit 3 on the brush head body 1. The first cleaning unit 2 and the second cleaning unit 3 are elastically contacted with the brush head body 1 through an elastic device 4. The transmission assembly 5 cooperates with the first cleaning unit 2 and the second cleaning unit 3, so that the first cleaning unit 2 and the second cleaning unit 3 can rotate back and forth alternately, penetrate into the gaps between teeth and areas such as the gingival sulcus to perform cleaning actions, thereby achieving comprehensive and efficient cleaning of the teeth.

[0101] The present disclosure provides an electric toothbrush, comprising a grip portion and a brush head as described above, wherein the grip portion is configured for gripping, and the brush head is configured to be mounted on the grip portion via a fixing member 8 .

[0102] The electric toothbrush provided by the present disclosure includes a grip portion and a brush head as described above, which can achieve efficient and comprehensive cleaning of teeth.

[0103] It should be noted that for the aforementioned method embodiments, for ease of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present disclosure is not limited by the order of the actions described, because according to the present disclosure, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present disclosure.

[0104] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0105] The preferred embodiments of the present disclosure disclosed above are intended only to help illustrate the present disclosure. The optional embodiments do not describe all details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made based on the content of the present disclosure. The present disclosure selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present disclosure, so that those skilled in the art can better understand and utilize the present disclosure. The present disclosure is limited only by the claims and their full scope and equivalents.

Claims

1. A brush head, characterized in that: include: A brush head body (1) extends along a first axis, and a first cleaning unit (2) and a second cleaning unit (3) extending along the first axis are provided on the brush head body (1), and the first cleaning unit (2) and the second cleaning unit (3) are configured to be hinged to the brush head body (1) respectively; along the extension direction of the first axis, the first cleaning unit (2) and the second cleaning unit (3) each have two opposite ends, wherein one end of the first cleaning unit (2) and the second cleaning unit (3) are configured to be in elastic contact with the brush head body (1) via an elastic device (4); A transmission assembly (5), the transmission assembly (5) being configured to extend within the brush head body (1) to cooperate with the other ends of the first cleaning unit (2) and the second cleaning unit (3); when the transmission assembly (5) is driven to rotate back and forth within the brush head body (1), a torque is alternately applied to the other ends of the first cleaning unit (2) and the second cleaning unit (3), so that the first cleaning unit (2) and the second cleaning unit (3) rotate back and forth alternately.

2. The brush head according to claim 1, characterized in that The transmission assembly (5) is configured to be capable of reciprocating rotation with the second axis as the rotation center line: The transmission assembly (5) is configured such that when the transmission assembly rotates in a first direction with the second axis as the rotation center line, at least part of the rotational action applies a torque to the other end of the first cleaning unit (2), and is configured such that when the transmission assembly rotates in a second direction with the second axis as the rotation center line, at least part of the rotational action applies a torque to the other end of the second cleaning unit (3).

3. The brush head according to claim 2, characterized in that The transmission assembly (5) is configured to drive the first cleaning unit (2) to rotate in the process of rotating from the reset position with the second axis as the rotation center line along the first direction, and when the transmission assembly (5) rotates in the second direction with the second axis as the rotation center line to the reset position, the first cleaning unit (2) is configured to be reset under the elastic action of the elastic device (4); the transmission assembly (5) is configured to drive the second cleaning unit (3) to rotate in the process of rotating from the reset position with the second axis as the rotation center line along the second direction, and when the transmission assembly (5) rotates in the first direction with the second axis as the rotation center line to the reset position, the second cleaning unit (3) is configured to be reset under the elastic action of the elastic device (4).

4. The brush head according to claim 2, characterized in that The transmission assembly (5) is configured to drive the first cleaning unit (2) to deflect to a first predetermined position when rotating in a first direction to a first position, and the second cleaning unit (3) is configured to be reset under the action of the elastic device (4); the transmission assembly (5) is configured to drive the second cleaning unit (3) to deflect when rotating from the first position to the second direction, and the first cleaning unit (2) is configured to move in the reset direction under the action of the elastic device (4); The transmission assembly (5) is configured to drive the second cleaning unit (3) to deflect to a second predetermined position when rotating in the second direction to the second position, and the first cleaning unit (2) is configured to be reset under the action of the elastic device (4); the transmission assembly (5) is configured to drive the first cleaning unit (2) to deflect when rotating from the second position to the first direction, and the second cleaning unit (3) is configured to move in the reset direction under the action of the elastic device (4).

5. The brush head according to claim 1, characterized in that The transmission assembly (5) is a transmission rod (50), and the other ends of the first cleaning unit (2) and the second cleaning unit (3) are configured to be located in a rotation path of the end of the transmission rod (50).

6. The brush head according to claim 5, characterized in that The brush head body (1) has a first inner cavity (11) and a second inner cavity (12); the first inner cavity (11) is configured to accommodate the first cleaning unit (2) and the second cleaning unit (3); the transmission rod (50) is located in the second inner cavity (12); and the end of the transmission rod (50) is configured to extend out of the second inner cavity (12) and cooperate with the other ends of the first cleaning unit (2) and the second cleaning unit (3) in the first inner cavity (11).

7. The brush head according to claim 5, characterized in that The first cleaning unit (2) and the second cleaning unit (3) are configured to be connected to the first inner cavity (11) of the brush head body (1) via the same rotating shaft (7): During the process of the transmission rod (50) being driven to rotate back and forth within the brush head body (1), torque is alternately applied to the other ends of the first cleaning unit (2) and the second cleaning unit (3), so that the first cleaning unit (2) and the second cleaning unit (3) rotate back and forth alternately around the rotating shaft (7).

8. The brush head according to claim 1, characterized in that The elastic device (4) comprises a first elastic component (41) pre-pressed between the cavity wall of the first inner cavity (11) and the first cleaning unit (2), and a second elastic component (42) pre-pressed between the cavity wall of the first inner cavity (11) and the second cleaning unit (3).

9. The brush head according to claim 6, characterized in that The first cleaning unit (2) comprises a first base (21) and a brush filament (6), and the second cleaning unit (3) comprises a second base (31) and a brush filament (6). Along the extension direction of the first axis, the first base (21) and the second base (31) both have two opposite ends, wherein one end of the first base (21) and the second base (31) are both constructed to be in elastic contact with the brush head body (1) through an elastic device (4), and the other end is both constructed to cooperate with the transmission assembly (5).

10. The brush head according to claim 9, characterized in that Among the planes containing the first axis, at least one plane is a symmetric plane, so that the first cleaning unit (2) and the second cleaning unit (3) are arranged in a mirror-symmetrical manner with the symmetric plane as a reference plane; and / or, the first base (21) and the second base (31) are arranged in a mirror-symmetrical manner with the symmetric plane as a reference plane; and / or, the brush head body (1) is arranged in a mirror-symmetrical manner with the symmetric plane as a reference plane; and / or, the transmission assembly (5) is arranged in a mirror-symmetrical manner with the symmetric plane as a reference plane; and / or, the transmission rod (50) is arranged in a mirror-symmetrical manner with the symmetric plane as a reference plane.

11. The brush head according to claim 10, characterized in that The symmetry plane is perpendicular to the bottom surfaces of the first base (21) and the second base (31).

12. The brush head according to claim 9, characterized in that The mating locations of the transmission rod (50), the first base (21), and the second base (31) are all planes; when the transmission rod (50) is in the reset position, the planes of the mating locations of the first base (21), the second base (31), and the transmission rod (50) are parallel.

13. The brush head according to claim 7, characterized in that Along the extension direction of the first axis, the rotating shaft (7) is located between the contact positions of the elastic component, the transmission rod (50), the first cleaning unit (2), and the second cleaning unit (3).

14. The brush head according to claim 6, characterized in that One end of the transmission rod (50) away from the first cleaning unit (2) and the second cleaning unit (3) is constructed into a cylindrical shape having a transmission cavity (52); the transmission cavity (52) is constructed to be transmission-connected to an external power source.

15. The brush head according to claim 14, characterized in that A flange (51) is provided at one end of the transmission rod (50) away from the first cleaning unit (2) and the second cleaning unit (3), and a limiting groove is provided on the inner wall of the second inner cavity (12). The flange (51) is located in the limiting groove and is configured to rotate in the limiting groove with the second axis as the rotation center line.

16. The brush head according to claim 15, characterized in that A step surface is provided on the inner wall of the second inner cavity (12), and a fixing member (8) is installed in the second inner cavity (12), and the end surface of the fixing member (8) and the step surface form the limiting groove; the fixing member (8) is constructed to have a hollow cavity connected to the transmission cavity (52), and the external power source is constructed to pass through the hollow cavity and be connected to the transmission cavity (52).

17. An electric toothbrush, characterized in that: include: a grip portion configured for gripping; According to any one of claims 1 to 16, the brush head is constructed to be mounted on the grip portion via a fixing member (8).

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