Brush head and electric toothbrush

Abstract

The present disclosure relates to a brush head configured to be mounted on a machine body, comprising a brush head body, a cleaning part attached to one end of the brush head body, a transmission part at least partially arranged in the cavity, comprising a first transmission part and a second transmission part, the first end of the second transmission part is configured to be constrained by a mutually matched abutting part and a limiting part with the machine body, and the second end of the second transmission part is configured to be eccentrically matched with the cleaning part; wherein the abutting part is configured to be movable relative to the brush head body between a first position and a second position, when the abutting part is in the first position, the abutting part is configured to extend in a first direction under the action of an elastic device, so as to be matched with the limiting part; when the abutting part is in the second position, the abutting part is configured to move in a second direction opposite to the first direction against the action of the elastic device. The brush head provided by the present disclosure realizes the installation and locking with the machine body through the abutting part, is suitable for the installation at any angle of external vibration source, and can effectively improve the cleaning efficiency.

Description

Technical Field

[0001] This disclosure relates to the field of oral hygiene equipment technology, and more specifically, to a brush head and an electric toothbrush. Background Technology

[0002] Oral health is a crucial foundation for overall health. With increasing awareness of oral hygiene, electric toothbrushes have gradually become a popular daily cleaning tool due to their efficient cleaning capabilities. Compared to traditional manual toothbrushes, electric toothbrushes use mechanical drive to achieve regular, high-frequency movements, which can more effectively remove plaque and reduce the risk of gum damage. However, most existing electric toothbrushes rely on a single rotation or vibration mode to drive the brush head, limiting the movement trajectory and making it difficult to thoroughly remove plaque from hidden areas such as between teeth and the gingival sulcus, especially creating cleaning blind spots in complex oral structures. Furthermore, prolonged unidirectional movement can accelerate bristle wear, further weakening the cleaning effect. Utility Model Content

[0003] In view of this, the present disclosure provides a brush head and an electric toothbrush to address the technical deficiencies existing in the prior art.

[0004] To achieve the above objectives, the present disclosure adopts the following technical solution: According to a first aspect of this disclosure, a brush head is provided, the brush head being configured to be mounted on a body, comprising: A brush head body, the brush head body being configured to extend along a first axis and including a sidewall defining an open cavity; A cleaning section attached to one end of the brush head body; The transmission part, at least partially disposed within the cavity, 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 machine body through mutually cooperating abutment and limiting part, and the second end of the second transmission member is configured to be eccentrically engaged with the cleaning part. When the first transmission member is driven by an external vibration source, it drives the second transmission member to swing around the connector as the fulcrum. Under the constraint of the machine body, the second end of the first end of the second transmission member drives the cleaning part to rotate. 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 cooperate with the limiting part. When it 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.

[0005] In one embodiment of this disclosure, the abutment is configured to move from a first position to a second position under the action of an external force, overcoming the force of the elastic device, and to move from the second position to the first position under the action of the elastic device after the external force is removed.

[0006] In one embodiment of this disclosure, the first end of the second transmission member is provided with a mounting portion extending along a first axis direction, the abutment member is configured to be movably connected to the mounting portion and is configured to be movable relative to the second transmission member between a first position and a second position; the elastic device is located between the abutment member and the mounting portion.

[0007] In one embodiment of this disclosure, the mounting portion is a movable cavity disposed on the second transmission member, the abutment member is configured to be located within the movable cavity, and the end of the abutment member used to cooperate with the limiting portion is configured to extend from the end of the brush head body away from the cleaning portion.

[0008] 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.

[0009] In one embodiment of this disclosure, the mounting portion is a threaded hole provided on the second transmission member, and one end of the bushing is configured to engage with the threaded hole via a stud.

[0010] 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.

[0011] In one embodiment of this disclosure, the cleaning unit includes a first brush head and a second brush head, the second brush head being pivotable, 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.

[0012] In one embodiment of this disclosure, the first end of the second transmission member is partially restricted from movement by the limiting part, and the second end swings in the opposite direction with the connecting member as the fulcrum, thereby driving the second brush head to rotate.

[0013] In one embodiment of this disclosure, a mating portion is provided at one end of the first transmission member, and a mating hole is provided on the second transmission member. The mating portion is configured to mate with the mating hole to form the connecting member.

[0014] In one embodiment of this disclosure, when the first transmission member is driven by the external vibration source, it reciprocates about the first axis as the rotation center. The limiting part restricts the movement of the abutment member, causing the second end of the second transmission member to undergo relative displacement with respect to the connecting member along the extension direction of the first axis.

[0015] In one embodiment of this disclosure, a mounting portion extending along a first axis is provided at one end of the body adjacent to the brush head; the abutment is configured to be movably connected to the mounting portion and to be movable relative to the first transmission member between a first position and a second position; the elastic device is located between the abutment and the mounting portion; and the limiting portion is configured to be located on the brush head body.

[0016] In one embodiment of this disclosure, the second transmission member is provided with a counterweight block, the counterweight block being configured to extend along the extension direction of the second transmission member.

[0017] In one embodiment of this disclosure, the counterweight includes a first counterweight and a second counterweight. The first counterweight is disposed on the portion of the second transmission member located between the connector and the first end, and the second counterweight is disposed on the portion of the second transmission member located between the connector and the second end.

[0018] According to a second aspect of this disclosure, an electric toothbrush is provided, comprising: The fuselage is configured for gripping; A power shaft, which is mounted on the machine body; According to the brush head described above, the brush head is configured to be connected to the body via the drive shaft, the drive shaft is configured to be an external vibration source of the brush head, and the cleaning part of the brush head is configured to vibrate relative to the body.

[0019] In one embodiment of this disclosure, the limiting part is a limiting groove disposed on the body of the device adjacent to one end of the brush head body, and when the abutting member is in the first position, the abutting member is configured to extend into the limiting groove.

[0020] The brush head provided in this disclosure is installed and locked to the body through a connecting part, and can be installed at any angle to accommodate external vibration sources, which can effectively improve cleaning efficiency.

[0021] 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

[0022] Figure 1 This is a schematic diagram of the structure of a brush head provided in one embodiment of the present disclosure; Figure 2 This is a schematic diagram illustrating the movement state of a brush head according to an embodiment of this disclosure; Figure 3 This is an exploded view of the structure of a brush head provided in one embodiment of the present disclosure.

[0023] 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-Connecting component; 41-Matching section; 42-Matching hole; 5-Abutting component; 51-Sleeve; 52-Abutting rod; 521-Ball head structure; 6-Limiting section; 7-Body; 8-Elastic device; 9-Mounting section; 10-Stud; 11-External vibration source; 121-First counterweight; 122-Second counterweight. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] The specific embodiments of this disclosure are described below with reference to the accompanying drawings.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] This disclosure relates to a brush head configured to be mounted on a device body. The brush head includes a brush head body, a cleaning section attached to one end of the brush head body, and a transmission section at least partially disposed within a cavity. The transmission section includes a first transmission member and a second transmission member. A first end of the second transmission member is configured to be constrained to the device body by a cooperating abutment member and a limiting member. A second end of the second transmission member is configured to be eccentrically engaged with the cleaning section. The abutment member is configured to move relative to the brush head body between a first position and a second position. When the abutment member is in the first position, it is configured to extend in a first direction under the force of an elastic device to engage with the limiting member. When the abutment member 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.

[0033] The brush head provided in this disclosure is installed and locked to the body through a connecting part, and can be installed at any angle to accommodate external vibration sources, which can effectively improve cleaning efficiency.

[0034] For ease of understanding, please refer to the following: Figures 1 to 3 The specific structure and working principle of the brush head and electric toothbrush disclosed herein will be described in detail with reference to the embodiments.

[0035] refer to Figure 1 This disclosure provides a brush head configured to be mounted on a body 7, including a brush head body 1, a cleaning section 2 attached to one end of the brush head body 1, and a transmission section 3 at least partially disposed within a cavity. The brush head in this embodiment can be applied to an electric toothbrush, wherein the brush head body 1 provides structural support for the entire brush head, the cleaning section 2 is provided with bristles for directly cleaning the tooth surface, and the transmission section 3 is used to transmit power to the cleaning section 2, driving it to generate the movement required for cleaning.

[0036] In this embodiment, a first axis extending longitudinally along the brush head is defined, and the brush head body 1 is constructed to extend along the first axis, including a sidewall defining an open cavity. A transmission unit 3 is at least partially disposed within the cavity, including a first transmission member 31 and a second transmission member 32. The first transmission member 31 is connected to an external vibration source 11, and the first transmission member 31 and the second transmission member 32 are connected via a connector 4 and extend along the first axis.

[0037] With the connecting member 4 as the boundary, the first end of the second transmission member 32 is configured to be constrained by the mating abutment member 5, the limiting part 6, and the body 7, thereby limiting its degree of freedom of movement; the second end of the second transmission member 32 is configured to be eccentrically fitted with the cleaning part 2. When the first transmission member 31 is driven by the external vibration source 11, it drives the second transmission member 32 to swing around the connecting member 4 as the fulcrum. Under the constraint of the body 7, the second end of the first end of the second transmission member 32 drives the cleaning part 2 to rotate.

[0038] 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 8 to engage with the limiting part 6, ensuring that the brush head does not detach from the body 7 during operation. When in the second position, the abutment 5 is configured to overcome the force of the elastic device 8 and move in a second direction opposite to the first direction.

[0039] The first transmission component 31 of this disclosure is used for transmission connection with an external power source, so that the external power source can drive the first transmission component 31 to move, thereby driving the second transmission component 32 to move. In an embodiment of the brush head of this disclosure applied to an electric toothbrush, the electric toothbrush includes a body 7, and the brush head of this disclosure is detachably connected to the body 7, so that the brush head of the electric toothbrush can be replaced. A drive source is provided in the body 7, which can be, for example, a drive motor. The output end of the drive motor can be bonded to the first transmission component 31, so that the drive motor can transmit power to the first transmission component 31, and at the same time, the first transmission component 31 and the output end of the drive motor can be detachably connected. A corresponding keyway is provided at one end of the first transmission component 31, and the output end of the drive motor can be bonded to the first transmission component 31 by means well known to those skilled in the art, such as a flat key, a semi-circular key, a wedge key, a tangential key, or a spline. However, regardless of the type of bonding method, the brush head needs to be aligned with the body 7 at a predetermined angle in order for the first transmission component 31 to be bonded to the output end of the drive motor. When the user removes the brush head from the body 7 and the output end of the drive motor rotates relative to it, the user can engage the second transmission component 31 with the output end of the drive motor according to the adjusted angle. However, due to the change in the installation angle, the abutting part 5 of the second transmission component 32 is offset from the upper limit part 6 of the body 7, and the abutting part 5 and the limit part 6 cannot be connected.

[0040] In this disclosed brush head, when it needs to be installed on the body 7, after the user aligns and locks the first transmission member 31 to the output end of the drive motor at a predetermined angle, if the relative position between the abutment member 5 and the limiting part 6 changes, the abutment member 5 will be squeezed by the mating end plane of the body 7, causing it to move in the second direction against the action of its internal elastic device 8, i.e., retract into the brush head body 1. When the toothbrush is turned on, when the external vibration source 11 rotates to the return angle, the brush head will move under the action of the external vibration source 11. When the abutment member 5 moves with the brush head body to the position corresponding to the limiting part 6, the abutment member 5 will automatically pop out under the force of the elastic device 8 and cooperate with the limiting part 6, thereby achieving the final assembly of the brush head and the body 7. Based on this, in this disclosed brush head, when the external vibration source 11 is rotated to any angle by external force, the abutment member 5 can be reset to cooperate with the limiting part 6, thereby achieving a stable assembly of the brush head and the body 7.

[0041] In a specific embodiment of this disclosure, the abutment 5 is configured to move from a first position to a second position under the action of an external force, overcoming the force of the elastic device 8, and to move from the second position to the first position under the action of the elastic device 8 after the external force is removed.

[0042] 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 8. 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 8 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.

[0043] In one embodiment of this disclosure, the first end of the second transmission member 32 is provided with a mounting portion 9 extending along a first axis. The abutment member 5 is configured to be movably connected to the mounting portion 9 and to be movable relative to the second transmission member 32 between a first position and a second position. The mounting portion 9 can be a hollow cylindrical or shaft-like structure with an internal accommodating space for mounting the abutment member 5 and the elastic device 8. Specifically, the elastic device 8 is located between the abutment member 5 and the mounting portion 9. The elastic device 8 can be a helical spring and is located between the sidewall of the abutment member 5 and the mounting portion 9. In its natural state, the elastic device 8 is in a pre-compressed or pre-stretched state, thereby continuously providing a force to the abutment member 5 toward its first position.

[0044] Furthermore, the mounting portion 9 is a movable cavity provided on the second transmission member 32, wherein the axis of the movable cavity is parallel to the first axis, thereby ensuring the linearity and stability of the motion transmission. The abutment member 5 is configured to be located within the movable cavity, and slides against the inner wall of the movable cavity via the elastic device 8, allowing the abutment member 5 to smoothly reciprocate within the movable cavity in the first circumferential direction without jamming or excessive shaking. Furthermore, the end of the abutment member 5 that engages with the limiting portion 6 is configured to extend from the end of the brush head body 1 away from the cleaning portion 2. Based on this, refer to... Figure 2 When the brush head is installed onto the body 7, the end of the abutment 5 that mates with the limiting part 6 can extend directly and form a mating constraint with the corresponding limiting part 6 on the body 7. In this embodiment, integrating the movable cavity directly into the end of the second transmission member 32 can save axial space, optimize the transmission path, and reduce energy loss.

[0045] refer to Figure 1 In a specific embodiment of this disclosure, the abutting member 5 includes a bushing 51 connected to the second transmission member 32 and an abutting rod 52 movably connected in the cavity. The elastic device 8 is configured to be sleeved on the abutting rod 52 and abut against the bushing 51. The end of the abutting rod 52 that cooperates with the limiting part 6 is configured to extend from the end of the brush head body 1 away from the cleaning part 2.

[0046] Specifically, the bushing 51 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 52 passes through the inner hole of the bushing 51 and can slide relative to the bushing 51 along the first axis direction. The bushing 51 provides a stable guide surface for the abutment rod 52, ensuring the linear movement of the abutment rod 52, preventing uneven wear or jamming, and extending its service life. The elastic device 8 is directly sleeved on the outside of the abutment rod 52 and housed in the inner cavity of the bushing 51. One end of the spring abuts against the abutment rod 52, and the other end abuts against the bushing 51. The end of the abutment rod 52 that cooperates with the limiting part 6 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 6.

[0047] Furthermore, the mounting part 9 is a threaded hole provided on the second transmission member 32, the axis of which is parallel to the first axis to ensure coaxiality of power transmission. Correspondingly, one end of the bushing 51 is configured to engage with the threaded hole via a stud 10. During assembly, by screwing the stud 10 end of the bushing 51 into the threaded hole, a firm and detachable fixed connection between the bushing 51 and the second transmission member 32 is achieved through the threaded engagement. The threaded connection provides strong axial locking force and circumferential constraint, ensuring that the bushing 51 will not loosen or fall off under the working environment of high-speed vibration of the brush head, thus guaranteeing the reliability of movement.

[0048] In this embodiment, reference Figure 1 The end of the abutment rod 52 extending from the brush head body 1 is provided with a ball head structure 521, which is configured to cooperate with the limiting part 6. The smooth hemispherical or near-spherical protrusion of the ball head structure 521 can be integrally injection molded with the abutment rod 52, or fixed as a separate part to the end of the abutment rod 52 by inlay, bonding, or other methods. Correspondingly, the limiting part 6 can be configured as a ball-and-socket structure. The ball head structure 521 at one end of the abutment rod 52 ensures that the contact between the spherical surface and the limiting part 6 is a point contact or partial surface contact, significantly reducing sliding friction resistance compared to planar or cylindrical surface contact. This makes the abutment rod 52 engage and disengage from the limiting part 6 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 521 has a certain self-alignment function. Even if there are minor assembly coaxiality deviations or manufacturing tolerances between the brush head and the body 7, the spherical surface can adaptively adjust the contact position through slight rolling and sliding to ensure reliable mating. Moreover, the spherical contact helps to disperse contact stress, preventing excessive stress concentration at the edges. This reduces the risk of plastic deformation or breakage of the abutment rod 52 and the limiting part 6 due to long-term cyclic stress, improving the reliability and durability of the product under long-term use.

[0049] In one embodiment of this disclosure, the cleaning unit 2 is a composite cleaning structure, including a first brush head 21 and a second brush head 22. The second brush head 22 is pivotally configured, and the second end of the second transmission member 32 is configured to eccentrically engage with the second brush head 22, driving the second brush head 22 to rotate. The second brush head 22 is located at the end of the brush head body 1 furthest from the main body 7. When an external vibration source 11 drives the first transmission member 31 to move, it causes the second transmission member 32 to oscillate at a high frequency with its connecting member 4 as a fulcrum. The second end of the second transmission member 32 moves within a plane of a preset arc and engages with the second brush head 22, driving 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.

[0050] Furthermore, the first end of the second transmission member 32 is partially restricted to move by the limiting part 6, and the second end swings in the opposite direction with the connecting member 4 as the fulcrum, thereby driving the second brush head 22 to rotate.

[0051] Specifically, when the first transmission component 31 is driven by the external vibration source 11, it transmits the vibration to the connecting component 4, which in turn drives the entire second transmission component 32 to move. Since the first end of the second transmission component 32 has some degrees of freedom restricted by the limiting part 6, it cannot freely follow the vibration of the first transmission component 31. This constraint obstructs the movement of the first end, forcing the second transmission component 32 to use the connecting component 4 as a lever fulcrum. According to the lever principle, when the first end is subjected to a constraint reaction force from the body 7 and produces a small displacement in one direction, the second end of the second transmission component 32 will swing in the opposite direction. Then, the swing of the second end, through its eccentric engagement with the second brush head 22, is converted into the reciprocating rotation of the second brush head 22 around its pivot axis. In this embodiment, the lever principle is used to amplify and convert the limited input displacement into the effective output motion required by the cleaning unit 2. The energy transfer path is clear, the conversion efficiency is high, and thus its cleaning efficiency is significantly improved.

[0052] In one embodiment of this disclosure, a mating portion 41 is provided at one end of the first transmission member 31, and a mating hole 42 is provided on the second transmission member 32. The mating portion 41 is configured to mate with the mating hole 42 to form a connecting member 4. The mating portion 41 can be configured as a protruding cylindrical shaft, and correspondingly, the shape of the mating hole 42 is adapted to the mating portion 41, and can be configured as a shaft hole mates with the cylindrical shaft. Based on this, the mating portion 41 and the mating hole 42 allow relative rotation of the first transmission member 31 and the second transmission member 32 within a predetermined angle range at the connection point, while simultaneously transmitting vibration and torque. Furthermore, the mating portion 41 and the mating hole 42 are respectively part of the bodies of the first transmission member 31 and the second transmission member 32, avoiding potential assembly accumulation errors, gaps, and loosening caused by adding an intermediate connecting member 4.

[0053] In a specific embodiment of this disclosure, when the first transmission member 31 is driven by the external vibration source 11, it reciprocates about the first axis as the rotation center. The limiting part 6 restricts the movement of the abutment member 5, so that the second end of the second transmission member 32 is relatively displaced relative to the connecting member 4 along the extension direction of the first axis.

[0054] Specifically, driven by the external vibration source 11 inside the fuselage 7, the first transmission member 31 reciprocates around the first axis as its rotation center at a predetermined angle. The limiting part 6 restricts the movement of the abutment member 5. This restriction is not a complete lock, but rather constrains the degree of freedom of movement of the abutment member 5 and the first end of the rigidly connected second transmission member 32 in a plane perpendicular to the first axis. Based on this constraint, the connecting member 4 acts as a fulcrum. When the first transmission member 31 reciprocates and drives the second transmission member 32, the movement of the first end of the second transmission member 32 is guided by the limiting part 6 to be a linear movement along the first axis. The entire second transmission member 32 is essentially performing lever movement with the connecting member 4 as the pivot. This causes the second end of the second transmission member 32 to produce a relative displacement along the first axis direction, opposite to the direction of movement of the first end. The limiting part 6 guides the axial movement, ensuring that the second transmission component 32 always moves along the preset trajectory, preventing it from radially shifting or swaying during operation, thereby eliminating the noise, wear and functional failure that may result, and significantly improving the durability of the product.

[0055] In another embodiment of this disclosure, a mounting portion 9 extending along a first axis is provided on one end of the body 7 adjacent to the brush head. The abutment 5 is configured to be movably connected to the mounting portion 9 and is configured to be movable relative to the first transmission member 31 between a first position and a second position. An elastic device 8 is located between the abutment 5 and the mounting portion 9. A limiting portion 6 is configured to be located on the brush head body 1.

[0056] Specifically, the mounting portion 9 extends along the first axis and has an internal receiving space or guide structure. The elastic device 8 is positioned between the abutment member 5 and the mounting portion 9, providing a continuous elastic force to the abutment member 5 toward its first position, allowing the abutment member 5 to remain extended without manual intervention. Correspondingly, a limiting portion 6 is constructed on the brush head body 1 to ensure that when the brush head is mounted to the body 7 along the first axis, the abutment member 5 extending from the mounting portion 9 of the body 7 accurately engages with the limiting portion 6. By placing the mounting portion 9 and the abutment member 5 on the body 7, the structural complexity and manufacturing cost of the brush head are reduced, as well as the probability of brush head failure.

[0057] refer to Figure 3In one embodiment of this disclosure, a counterweight is provided on the second transmission member 32, and the counterweight is configured to extend along the extension direction of the second transmission member 32. The mass distribution of the counterweight extends along the extension direction of the second transmission member 32 itself; it can be a continuous mass block or multiple discretely distributed but axially arranged counterweight units. When the second transmission member 32 swings at the fulcrum of the connecting member 4, it generates inertial force. By providing the counterweight, it helps maintain the smoothness and continuity of motion during high-speed reciprocating motion, ensuring that the cleaning unit 2 receives a continuous and uniform driving force, making the cleaning action more stable and reliable, and contributing to improved consistency of cleaning results.

[0058] Furthermore, the counterweight includes a first counterweight 121 and a second counterweight 122. The first counterweight 121 is disposed on the portion of the second transmission component 32 located between the connecting member 4 and the first end, and the second counterweight 122 is disposed on the portion of the second transmission component 32 located between the connecting member 4 and the second end. The second transmission component 32 can be considered as a lever with the connecting member 4 as its fulcrum, and its first and second ends generate inertial forces in opposite directions during movement. By independently setting counterweights on both sides of the lever, the unbalanced inertial forces generated by the first and second ends can be balanced separately and specifically. Compared with a single counterweight scheme, this achieves a more accurate and thorough dynamic force balance, making the force on the entire system more balanced during reciprocating motion, resulting in smoother and more reliable operation, and helping to extend its service life.

[0059] This disclosure provides an electric toothbrush, including a body 7, a drive shaft, and a brush head as described above. The body 7 is configured for holding; the drive shaft is mounted on the body 7; the brush head is configured to be connected to the body 7 via the drive shaft; the drive shaft is configured as an external vibration source 11 for the brush head; and the cleaning portion 2 of the brush head is configured to vibrate relative to the body 7.

[0060] Specifically, the body 7 is constructed as a handle-like portion for the user to hold, housing core components such as the battery, control circuitry, and drive motor. The body 7 typically features an ergonomic, streamlined design to ensure comfortable grip and stable operation. One end of the body 7 has a connection interface for docking with the brush head. The power shaft is reciprocatingly mounted on the body 7, with one end directly or indirectly connected to the output of the drive motor inside the housing, and the other end extending to the connection interface of the body 7 as the power output end. This transmits the high-frequency rotational or oscillating power generated by the motor outwards, serving as the direct power source for the brush head's operation. The brush head docks with the interface of the body 7 at the end of its body 1 furthest from the cleaning section 2, enabling a transmissive connection between its first transmission component 31 and the power shaft. Thus, the vibration of the power shaft directly drives the first transmission component 31. The specific working principle of the brush head can be found above and will not be repeated here.

[0061] The electric toothbrush provided in this disclosure achieves a dual cleaning action of the cleaning unit 2 through the cooperation of the external vibration source 11 and the transmission unit 3, which can effectively remove residues and plaque from complex areas such as gaps between teeth and gingival sulcus, significantly improving cleaning efficiency.

[0062] Furthermore, the limiting part 6 is a limiting groove provided on the body 7 near one end of the brush head body 1. When the abutment 5 is in the first position, the abutment 5 is configured to extend into the limiting groove. When the user installs the brush head onto the body 7 and turns on the device, the abutment 5 automatically rotates to the first position. At this time, the working end of the abutment 5 is extended into and engaged inside the limiting groove. By directly setting the limiting part 6 on the body 7, there is no need to add additional independent parts within the compact space of the body 7, simplifying the internal structure of the body 7 and improving the overall strength and durability.

[0063] 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.

[0064] 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.

[0065] 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. A brush head configured to be mounted on a machine body, characterized in that, include: The brush head body (1) is configured to extend along a first axis and includes a sidewall defining an open cavity; Cleaning section (2) attached to one end of the brush head body (1); The transmission part (3), which is at least partially disposed within the cavity, 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 (4) and extend along the first axis. With the connector (4) as the boundary, the first end of the second transmission member (32) is constrained by the body (7) through a mating abutment (5) and a limiting part (6). The second end of the second transmission member (32) is eccentrically fitted with the cleaning part (2). When the first transmission member (31) is driven by an external vibration source (11), it drives the second transmission member (32) to swing with the connector (4) as the fulcrum. Under the constraint of the body (7), the second end of the first end of the second transmission member (32) drives the cleaning part (2) to rotate. 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 (8) to cooperate with the limiting part (6). When it is in the second position, it is configured to overcome the force of the elastic device (8) and move in a second direction opposite to the first direction.

2. The brush head according to claim 1, characterized in that, The abutment (5) is configured to move from the first position to the second position under the action of an external force, overcoming the force of the elastic device (8), and to move from the second position to the first position under the action of the elastic device (8) after the external force is removed.

3. The brush head according to claim 1, characterized in that, The first end of the second transmission member (32) is provided with a mounting portion (9) extending along the first axis direction. The abutment member (5) is configured to be movably connected to the mounting portion (9) and is configured to be able to move relative to the second transmission member (32) between a first position and a second position. The elastic device (8) is located between the abutment member (5) and the mounting portion (9).

4. The brush head according to claim 3, characterized in that, The mounting part (9) is a movable cavity provided on the second transmission member (32). The abutment member (5) is configured to be located in the movable cavity, and the end of the abutment member (5) used to cooperate with the limiting part (6) is configured to extend from the end of the brush head body (1) away from the cleaning part (2).

5. The brush head according to claim 3, characterized in that, The abutment (5) includes a bushing (51) connected to the second transmission member (32) and an abutment rod (52) movably connected to the cavity. The elastic device (8) is configured to be sleeved on the abutment rod (52) and abut against the bushing (51). One end of the abutment rod (52) for cooperating with the limiting part (6) is configured to extend from the end of the brush head body (1) away from the cleaning part (2).

6. The brush head according to claim 5, characterized in that, The mounting part (9) is a threaded hole provided on the second transmission member (32), and one end of the bushing (51) is configured to be threadedly engaged with the threaded hole by a stud (10).

7. The brush head according to claim 5, characterized in that, The abutment rod (52) has a ball head structure (521) at one end extending from the brush head body (1), and the ball head structure (521) is configured to cooperate with the limiting part (6).

8. The brush head according to claim 1, 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 be pivotable. The second end of the second transmission member (32) is configured to be eccentrically engaged with the second brush head (22) to drive the second brush head (22) to rotate.

9. The brush head according to claim 8, characterized in that, The first end of the second transmission member (32) is partially restricted by the limiting part (6), and the second end swings in the opposite direction with the connecting member (4) as the fulcrum, driving the second brush head (22) to rotate.

10. The brush head according to claim 1, characterized in that, The first transmission member (31) has a mating part (41) at one end, and the second transmission member (32) has a mating hole (42). The mating part (41) is configured to mate with the mating hole (42) to form the connecting member (4).

11. The brush head according to claim 1, characterized in that, When the first transmission member (31) is driven by the external vibration source (11), it reciprocates around the first axis as the rotation center. The limiting part (6) restricts the movement of the abutment member (5), causing the second end of the second transmission member (32) to undergo relative displacement with respect to the connecting member (4) along the extension direction of the first axis.

12. The brush head according to claim 1, characterized in that, The body (7) has a mounting portion (9) extending along a first axis at one end adjacent to the brush head. The abutment (5) is configured to be movably connected to the mounting portion (9) and is configured to be able to move relative to the first transmission member (31) between a first position and a second position. The elastic device (8) is located between the abutment (5) and the mounting portion (9). The limiting portion (6) is configured to be located on the brush head body (1).

13. The brush head according to claim 1, characterized in that, The second transmission member (32) is provided with a counterweight block, which is configured to extend along the extension direction of the second transmission member (32).

14. The brush head according to claim 13, characterized in that, The counterweight includes a first counterweight (121) and a second counterweight (122). The first counterweight (121) is disposed on the part of the second transmission member (32) located between the connecting member (4) and the first end. The second counterweight (122) is disposed on the part of the second transmission member (32) located between the connecting member (4) and the second end.

15. An electric toothbrush, characterized in that, include: The fuselage (7) is configured for gripping; A power shaft is mounted on the fuselage (7); According to any one of claims 1-14, the brush head is configured to be connected to the body (7) via the power shaft, the power shaft is configured to be an external vibration source (11) of the brush head, and the cleaning part (2) of the brush head is configured to vibrate relative to the body (7).

16. The electric toothbrush according to claim 15, characterized in that, The limiting part (6) is a limiting groove provided on the body (7) near one end of the brush head body (1). When the abutting member (5) is in the first position, the abutting member (5) is configured to extend into the limiting groove.

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