Electric toothbrush

Abstract

The utility model discloses an electric toothbrush which comprises a support, a driving piece, an elastic piece and a sensor, the driving piece is partially arranged in the support, an output shaft of the driving piece extends out of the support, at least part of the elastic piece is hollowed out, part of the output shaft abuts against the hollowed-out part of the elastic piece, and the sensor is arranged on one side of the elastic piece. The sensor is used for converting elastic deformation of the elastic piece into an electric signal. According to the electric toothbrush disclosed by the utility model, the sensor is arranged on the elastic piece, and the hollow part for propping against the output shaft is arranged on the elastic piece, so that the problem that a connecting wire of the pressure sensor is broken due to the rotation of the output shaft when the electric toothbrush in the prior art is not used is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field related to toothbrushes, and in particular relates to an electric toothbrush. Background Art

[0002] As people's living standards improve, oral cleaning appliances such as electric toothbrushes are widely welcomed as electronic products for personal care. Usually, an electric toothbrush may include a vibration motor and a brush head, wherein the brush head is connected to the output shaft of the vibration motor, and the vibration motor drives the brush head to vibrate, thereby cleaning the user's oral cavity.

[0003] Among them, many electric toothbrushes have the problem of damaging gums and poor cleaning effect due to excessive force when used. In order to solve the above problem, a pressure sensor is usually set on the output shaft to detect the pressure on the brush head. When the pressure on the brush head is too high, an alarm can be issued to remind the user, thereby reducing damage to the gums.

[0004] However, for some existing electric toothbrushes, when not powered on or in standby mode, the output shaft of the vibration motor can rotate at a large angle, for example, more than 30 degrees or even 360 degrees. The large angle rotation of the output shaft will cause the connecting wire of the pressure sensor located on the output shaft to easily get entangled on the output shaft and cause the connecting wire of the pressure sensor to break, resulting in the vibration motor not being able to work normally and the electric toothbrush being damaged. In other words, some existing electric toothbrushes cannot implement the pressure sensing solution and need to be improved.

[0005] Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Utility Model Content

[0006] Therefore, the technical problem to be solved by the present invention is that some electric toothbrushes in the prior art cannot be provided with pressure sensors, resulting in the inability to realize the pressure sensing function.

[0007] In order to solve the above technical problems, the utility model provides an electric toothbrush, which includes a bracket, a driving member, which is partially arranged inside the bracket, and the output shaft of the driving member extends out of the bracket; an elastic member, at least part of which is hollowed out, and part of the output shaft abuts against the hollow part of the elastic member; a sensor, which is arranged on one side of the elastic member, and the sensor is used to convert the elastic deformation of the elastic member into an electrical signal.

[0008] In the present application, the elastic part of the electric toothbrush has a hollow part, and the output shaft of the driving part abuts against the hollow part. When the user brushes his teeth with force exceeding a certain level, the output shaft of the driving part will be deformed, and then the output shaft will abut against the hollow part of the elastic part to undergo elastic deformation. The sensor converts the elastic deformation of the hollow part into an electrical signal. The setting of the hollow part makes the elastic part more elastic and the elastic part has greater deformation compatibility. At the same time, the setting of the hollow part facilitates elastic deformation, thereby improving the accuracy of sensor detection.

[0009] The electric toothbrush of the present application adopts a method of setting the sensor on one side of the elastic member to conveniently convert the elastic deformation of the elastic member into an electrical signal. Compared with the related art in which the pressure sensor is directly connected to the output shaft, the technical solution of the present application can prevent the problem of the connection line of the pressure sensor being broken due to the rotation of the output shaft when the electric toothbrush is not in use, thereby ensuring the normal use of the electric toothbrush.

[0010] In one embodiment, the elastic member is a metal plate, and a plurality of holes are formed on the metal plate to enhance the elastic deformation capability of the elastic member.

[0011] In this configuration, the elastic member is made of a metal plate, which has good elastic deformation capability, thus ensuring that the elastic member has good resilience and preventing the elastic member from plastically deforming and causing the elastic member to fail. Furthermore, by opening a plurality of holes in the metal plate, the resilience of the metal plate is further improved, thus extending the service life of the elastic member.

[0012] In one embodiment, the elastic member includes a fixed portion and a free portion, the fixed portion is fixed relative to the bracket, the first end of the free portion is connected to the fixed portion, the second end of the free portion is suspended, and part of the output shaft abuts against the free portion; the sensor is arranged on one side of the free portion.

[0013] With such a configuration, the elastic part is divided into two parts, a fixed part and a free part, so that the end of the free part can be suspended in the air. The free part drives the sensor to operate by elastic deformation, and the sensor converts the deformation of the free part into an electrical signal. The setting of the suspended structure is conducive to the elastic deformation of the free part of the elastic part, which is further conducive to improving the accuracy of pressure detection of the electric toothbrush, and avoids the situation where the pressure detection is inaccurate or even fails due to the failure to correctly transmit the force when the user brushes his teeth with great force; since one end of the free part is not bound, it has greater deformation ability to achieve greater deformation compatibility, and the overall pressure detection function of the toothbrush is better. The structural setting of the free part and the fixed part of the present application realizes double deformation, which is beneficial to the protection of the elastic part, and avoids the problem that the free part exceeds the maximum elastic deformation, resulting in insensitivity or failure caused by failure to rebound.

[0014] In one embodiment, the elastic member has a hollow gap, and the elastic member is divided into a free portion and a fixed portion with the hollow gap as a boundary.

[0015] With such a configuration, the hollow gap is the hollow part of the elastic member, and the hollow gap ensures partial separation of the free portion and the fixed portion. The free portion is less restricted, so that when force is applied to the free portion, it is easier to deform, and the sensor can provide timely feedback to improve the accuracy of pressure detection of the electric toothbrush; and the free portion and the fixed portion are solid structures without holes and seams, which can enhance the service life of the free portion and the fixed portion. On the whole, the elastic member can achieve better pressure detection and has a longer service life.

[0016] In one embodiment, the free portion is a straight structure or a bent structure.

[0017] With such arrangement, the free portion can be arranged in a variety of structures to adapt to the output shaft, and elastically deform under the support of the output shaft, thereby improving the resilience of the elastic member.

[0018] In one embodiment, the fixing portion includes two ends spaced apart in the radial direction of the output shaft and a connecting plate disposed between the two ends, and the two ends are fixed relative to the bracket.

[0019] With such an arrangement, the two ends are used to be fixedly connected to the bracket to complete the fixed installation of the fixed part, so as to achieve a stable installation of the elastic part as a whole. The connecting plate is located between the two ends. When the user brushes his teeth too hard, the deformation degree of the output shaft increases, so that the output shaft will resist the free part and continue to deform. After a certain degree, the output shaft further resists the connecting plate. Then, under the action of such a large force, the fixed part will provide an opposite force to the output shaft, so that the user feels resistance to remind the user that the brushing force is relatively large at this time, and the fixed part bears part of the force. This also prevents such a large force from causing the free part to exceed the elastic deformation range, which is beneficial to protecting the elastic part.

[0020] In one embodiment, a notch is formed on the connecting plate, the cantilever end is connected to at least one of the two end portions and the connecting plate, and the extended end is suspended inside the notch.

[0021] In this way, the first end of the free part is a cantilever end, which is used to realize the connection between the free part and the fixed part so that the free part and the fixed part form a whole, and the second end of the free part is an extended end, which is formed inside the notch, so that the free part and the fixed part are arranged more compactly, which is beneficial to the small size design of the electric toothbrush; and the connecting plate accommodates the free part by means of the notch, which also makes the connecting plate have a more continuous structure at the non-opening part, which is beneficial to improve the strength of the connecting plate, and further helps to share the force of the output shaft for the free part.

[0022] In one embodiment, the first end of the free portion is connected to the end of one of the fixed portions, and the second end of the free portion extends toward the other end of the fixed portion; or the first end of the free portion is connected to the connecting plate, and the second end of the free portion extends along the axial direction of the output shaft.

[0023] With such an arrangement, one end of the free portion is used for installation with the fixed portion, and the other end is suspended, which is beneficial to improving the resilience of the elastic member, thereby enabling the output shaft to drive the free portion to undergo elastic deformation, thereby improving the measurement accuracy of the sensor.

[0024] In one embodiment, the electric toothbrush further comprises a flexible member, at least a portion of which is disposed between the free portion and the output shaft, and the output shaft drives the free portion to deform through the flexible member.

[0025] In this way, by setting a flexible part, the flexible part is relatively soft, and the flexible part is set between the output shaft and the free part, which can buffer the contact between the output shaft and the free part, avoid direct hard contact between the output shaft and the free part to cause aggravated vibration, and reduce the noise generated by the contact between the output shaft and the free part; at the same time, it also further prevents the free part from being subjected to excessive force, which causes the free part to be unable to rebound to the initial state after deformation, thereby improving the service life of the elastic part and further enhancing the stability of the electric toothbrush.

[0026] In one embodiment, the free portion has a protruding structure extending toward one side of the flexible member, the flexible member has a limiting groove, and at least a portion of the protruding structure extends into the limiting groove.

[0027] Such a configuration improves the installation stability between the flexible part and the elastic part through the configuration of the protruding structure and the limiting groove, thereby avoiding the situation where the flexible part shakes and causes noise. At the same time, the protruding structure and the limiting groove can achieve installation positioning, and further facilitate the installation of the flexible part and the elastic part.

[0028] In one embodiment, the flexible member is sleeved on the output shaft; or the flexible member is a gasket, the gasket is cushioned between the free portion and the output shaft, and the output shaft abuts against the free portion by abutting against the gasket.

[0029] With such a configuration, a flexible part sleeved on the output shaft can be used to achieve the effect of circumferentially protecting the output shaft, while also improving the stability of the connection between the output shaft and the flexible part; a gasket structure can also be used, and the gasket structure is arranged between the output shaft and the free part. The overall structure is simple, and the flexible part can be easily replaced.

[0030] In one embodiment, the bracket further has a limiting portion, which is arranged on the bracket. The limiting portion abuts against the output shaft to limit the elastic deformation of the output shaft caused by abutting against the elastic member.

[0031] In this way, the output shaft is limited by setting a limiting portion, thereby ensuring the amplitude of the output shaft against the elastic member, that is, limiting the elastic deformation of the elastic member, thereby ensuring that the elastic member can deform and rebound normally, which is beneficial to protecting the elastic member and increasing the service life of the elastic member.

[0032] In one embodiment, the vertical distance between the limiting portion and the output shaft is less than or equal to the maximum elastic deformation value of the elastic member.

[0033] With such a configuration, by adopting a vertical distance value between the limit part and the output shaft that is less than or equal to the maximum elastic deformation value of the elastic part, it is ensured that the elastic part will not exceed the maximum elastic deformation of the elastic part, thereby ensuring the normal operation of the elastic part, avoiding the phenomenon of being unable to rebound, and increasing the service life of the elastic part.

[0034] In one embodiment, the electric toothbrush further includes a flexible member, and a thickness of the flexible member is less than or equal to a vertical distance between the limiting portion and the output shaft.

[0035] With such a configuration, by adopting a thickness value of the flexible part that is less than or equal to the vertical distance value between the limiting part and the output shaft, it is ensured that the limiting part can achieve swing limiting of the output shaft. At the same time, it also avoids the flexible part being too thick, squeezing the elastic part beyond the maximum elastic deformation, resulting in the elastic part being unable to rebound normally, thereby improving the service life of the elastic part.

[0036] In one embodiment, the limiting portion is provided with a rotation limiting portion along the circumferential direction of the output shaft, and the rotation limiting portion is used to limit the rotation angle of the output shaft.

[0037] In this way, the output shaft is limited in rotation angle by setting the rotation limiting part, thereby ensuring that the output shaft rotates within a preset rotation angle range, which is beneficial to improving the controllability of the output shaft.

[0038] In one embodiment, the limiting portion is provided with a notch portion, and when the output shaft is subjected to force and approaches the limiting portion, the output shaft can extend into the notch portion, and the wall of the notch portion covers a portion of the output shaft, and the wall of the notch portion can limit the radial movement of the output shaft.

[0039] With such arrangement, the radial movement of the output shaft can be limited by the structure of the notch portion, further avoiding the phenomenon that the elastic member is supported by the output shaft and exceeds the maximum elastic deformation of the elastic member, resulting in the inability to rebound, thereby increasing the service life of the elastic member. At the same time, the rotation angle of the output shaft is limited by the notch portion, and the single structure of the limiting portion can both limit the deformation and limit the rotation angle, which is conducive to designing an electric toothbrush with a relatively small volume and optimizing the design.

[0040] In one embodiment, the bracket includes a first bracket and a second bracket, the first bracket and the second bracket are buckled to form an installation cavity, the end of the first bracket, or the end of the second bracket, or the end after the first bracket and the second bracket are buckled has an opening, part of the driving member is arranged inside the installation cavity, the output shaft passes through the end opening, the elastic member is arranged on the first bracket and / or the second bracket, and the elastic member is located at the position of the end opening.

[0041] In this way, the first bracket and the second bracket are arranged to realize the installation and fixation of the elastic member and the driving member, which is beneficial to improving the installation stability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 An exploded view of the electric toothbrush of the utility model;

[0044] Figure 2 It is a three-dimensional structural schematic diagram of the electric toothbrush of the utility model;

[0045] Figure 3 It is a schematic diagram of the installation structure of the output shaft, elastic member and flexible member of the utility model;

[0046] Figure 4 for Figure 3 A magnified view of point A;

[0047] Figure 5 It is a schematic diagram of the installation structure of the elastic member and the flexible member of the utility model;

[0048] Figure 6 It is a three-dimensional structural schematic diagram of the elastic member of the utility model;

[0049] Figure 7 This is a schematic diagram of the bottom structure of the flexible member of the utility model;

[0050] Figure 8 is a cross-sectional view of the electric toothbrush of the utility model;

[0051] Fig. 9 It is a structural schematic diagram of the limiting part of the utility model;

[0052] Fig.10 for Fig. 9 Enlarged view of point C.

[0053] Description of reference numerals:

[0054] 10. Bracket; 110. First bracket; 111. Limiting portion; 120. Second bracket; 20. Driving member; 210. Output shaft; 30. Elastic member; 310. Fixing portion; 311. End portion; 312. Connecting plate; 3121. Notch; 320. Free portion; 321. Extending end; 3211. Protruding structure; 322. Cantilever end; 330. Hollow gap; 40. Sensor; 50. Flexible member; 510. Limiting groove; 60. Brush head; 70. Circuit board; 80. Connecting line; 90. Handle housing. DETAILED DESCRIPTION

[0055] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0056] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0057] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0058] The utility model provides an electric toothbrush. It is used to solve the problem of the connection line of the pressure sensor being broken due to the rotation of the output shaft when the electric toothbrush is not in use in the prior art. Figure 1 As shown, the electric toothbrush includes a brush head and a handle, wherein the brush head is located at one end of the handle, and the brush head can be used to clean the oral cavity, and the handle can be used for the user to hold it, so that the user can more conveniently clean the oral cavity. The handle has a handle housing 90 for holding and protection.

[0059] like Figures 1 to 9As shown, the electric toothbrush includes a bracket 10, a driving member 20, an elastic member 30 and a sensor 40. The driving member 20 is partially arranged inside the bracket 10, and the output shaft 210 of the driving member 20 extends out of the bracket 10. At least a portion of the elastic member 30 is hollowed out, and a portion of the output shaft 210 abuts against the hollow portion of the elastic member 30. The sensor 40 is arranged on one side of the elastic member 30, and the sensor 40 is used to convert the elastic deformation of the elastic member 30 into an electrical signal.

[0060] The electric toothbrush also includes a controller arranged on the bracket 10, which is connected to the sensor 40 and the driving member 20 via a connecting line. The sensor 40 is used to convert the elastic deformation of the elastic member 30 into an electrical signal and send it to the controller inside the electric toothbrush. The controller processes the electrical signal to realize pressure detection of the electric toothbrush.

[0061] It can be understood that when the electric toothbrush in this embodiment is not in use, the output shaft 210 can rotate 360°; the electric toothbrush adjusts the rotation angle of the output shaft 210 through the Hall element; in this way, the swing angle of the electric toothbrush is more precise, and can achieve swing control of the traditional brushing angle greater than 30°, which is conducive to meeting the user's usage needs.

[0062] The non-use state of the electric toothbrush refers to a state in which the user is not brushing his teeth. Exemplarily, the non-use state of the electric toothbrush may include a standby state when the electric toothbrush is powered on, and also includes a shutdown state in which the electric toothbrush is not powered on.

[0063] Specifically, the electric toothbrush of the present application adopts the arrangement of the sensor 40 on one side of the elastic member 30, so as to conveniently convert the elastic deformation of the elastic member 30 into an electrical signal. Compared with the related art in which the sensor 40 (for example, a pressure sensor) is directly connected to the output shaft 210, the technical solution of the present application can prevent the problem of the connection line 80 of the sensor 40 being broken due to the rotation of the output shaft 210 when the electric toothbrush is not in use, so as to ensure the normal use of the electric toothbrush.

[0064] The driving member 20 is a motor, the controller is a circuit board 70 , and the circuit board 70 is disposed inside the bracket 10 .

[0065] In this embodiment, the bracket 10 is disposed inside the handle housing, and the bracket 10 is used to provide installation for the driving member 20 and the elastic member 30 .

[0066] The bracket 10 supports and fixes the driving member 20 and provides a mounting position for the elastic member 30, the controller and the sensor 40. Figure 1As shown, the bracket 10 includes a first bracket 110 and a second bracket 120, and the first bracket 110 and the second bracket 120 are buckled to form an installation cavity, and the first bracket 110 and the second bracket 120 form an opening at the ends after buckling, and a part of the driving member 20 is arranged inside the installation cavity, and the output shaft 210 passes through the opening at the rear end of the buckling of the first bracket 110 and the second bracket 120, and the elastic member 30 is located at the position of the opening at the rear end after buckling.

[0067] In this embodiment, the first bracket 110 forms a partial opening, and the second bracket 120 forms a partial opening, so that the first bracket 110 and the second bracket 120 are buckled to form a complete opening; it can be understood that in other embodiments, the first bracket 110 or the second bracket 120 can also form a complete opening separately, and no specific limitation is made. It should be noted that the elastic member 30 is located at the opening of the ends of the first bracket 110 and the second bracket 120, that is, it can be the side wall position of the opening, or it can be around the side wall of the opening. For example, the first bracket 110 and the second bracket 120 form an end wall at the end, and the protruding structure relative to the end wall forms an opening. It can be understood that the protruding structure relative to the end wall should be understood as the surrounding of the opening.

[0068] The handle shell is covered on the outside of the first bracket 110 and the second bracket 120 to fasten the first bracket 110 and the second bracket 120 . The driving member 20 , the elastic member 30 and the circuit board 70 are arranged inside the installation cavity formed by the first bracket 110 and the second bracket 120 .

[0069] The first bracket 110 and the second bracket 120 may be fastened together in a detachable manner through a snap-fit ​​structure, or the first bracket 110 and the second bracket 120 may be fastened together and fixed by a fastener, such as a bolt.

[0070] During the assembly process of the electric toothbrush, the driving member 20, the elastic member 30, the sensor 40 and the controller can be first installed and fixed to the corresponding first bracket 110 and the second bracket 120, and then the first bracket 110 and the second bracket 120 are buckled together, and the handle shell is covered on the outside of the first bracket 110 and the second bracket 120 in the buckled state to complete the handle installation.

[0071] By setting the first bracket 110 and the second bracket 120, and buckling the first bracket 110 and the second bracket 120 together with the driving member 20, the driving member 20 can be more stably fixed inside the installation cavity, and when the driving member 20 has a problem and needs to be repaired, this setting can also facilitate the disassembly of the first bracket 110 and the second bracket 120 to maintain the driving member 20. After the maintenance is completed, the original first bracket 110 and the second bracket 120 can continue to be used. Compared with setting the movement bracket as an integrated structure, this can reduce maintenance costs. By pressing and fixing the first bracket 110 and the second bracket 120, the stability of the installation of the elastic member 30 and the driving member 20 can be improved.

[0072] The present application is not limited to the first bracket 110 and the second bracket 120 that are snap-fitted together, but may also be an integrally formed bracket 10, with the end opening of the bracket 10 used to install the drive member 20 and the circuit board 70, and the output shaft of the drive member 20 extending from the other end opening of the bracket 10, and the installation of the elastic member at the other end of the bracket 10 is completed.

[0073] The use of an integrally formed bracket 10 is beneficial to improving the installation stability of the bracket 10, thereby ensuring the stability of the overall structure of the electric toothbrush.

[0074] In this embodiment, the elastic member 30 of the electric toothbrush of the present application has a hollow portion, and the output shaft 210 of the driving member 20 abuts against the hollow portion. During the brushing process, when the user brushes with a force exceeding a certain level, the output shaft 210 of the driving member 20 will be deformed, and then the output shaft 210 will abut against the hollow portion of the elastic member 30 to undergo elastic deformation. The sensor 40 converts the elastic deformation of the hollow portion into an electrical signal, thereby realizing the detection of the user's brushing force.

[0075] In this embodiment, the hollow portion is provided so that the elastic member 30 has better elastic deformation capability and greater deformation compatibility; the hollow portion is provided to facilitate elastic deformation of the elastic member 30 , thereby improving the detection accuracy of the sensor 40 .

[0076] The output shaft 210 abuts against the hollow portion of the elastic member 30. It should be understood that the output shaft 210 may abut against a solid structure having the hollow portion, or the output shaft 210 may abut against a structure adjacent to the hollow portion of the elastic member 30, both of which can improve the detection accuracy of the sensor 40.

[0077] It should be noted that when the user brushes his teeth with normal force, the vibration generated by the output shaft 210 for cleaning the teeth will basically not interfere with the elastic member 30, let alone deform the elastic member 30. The deformation of the elastic member 30 is caused by: when the user brushes his teeth, the force applied to the toothbrush is too large, the force presses the brush head against the teeth, and the reaction force is transmitted to the output shaft 210 through the brush head, the reaction force deforms the output shaft 210, and the output shaft 210 presses against the elastic member 30 to further deform.

[0078] In an embodiment not shown in the figure, the elastic member 30 is a plate structure, and a plurality of holes are opened on the plate structure to form a hollow portion, so as to enhance the elastic deformation ability of the elastic member 30 .

[0079] Specifically, the plate structure is a metal plate, which has good elastic deformation ability, ensuring that the elastic member 30 has good resilience, and preventing the elastic member 30 from plastic deformation, which leads to the problem of failure of the elastic member 30. Furthermore, by opening a plurality of holes in the metal plate, the resilience of the metal plate is further improved, so that the service life of the elastic member 30 can be extended.

[0080] The hollow part is formed by setting a structure with multiple holes, and the structural setting of the multiple holes is beneficial to improving the elastic deformation capacity.

[0081] like Figures 3 to 10 As shown, the elastic member 30 includes a free portion 320 and a fixed portion 310, the fixed portion 310 is fixed relative to the bracket 10, the first end of the free portion 320 is connected to the fixed portion 310, the second end of the free portion 320 is suspended, part of the output shaft 210 abuts against the free portion 320, and the sensor 40 is arranged on one side of the free portion 320. When the output shaft 210 abuts against the free portion 320 and deforms, the sensor 40 detects the deformation to realize pressure detection; the suspended free portion 320 is conducive to elastic deformation, which is further conducive to improving the accuracy of pressure detection of the electric toothbrush, and avoiding the situation where the pressure detection is inaccurate or even fails due to the inability to correctly transmit the force when the user brushes his teeth with greater force; and one end of the free portion 320 is not bound, so it has a greater deformation ability, achieves greater deformation compatibility, and the overall pressure detection function of the electric toothbrush is better.

[0082] The hollow portion of the elastic member 30 may be disposed on the free portion 320 or on the fixed portion 310 , or a hollow portion may be provided between the free portion 320 and the fixed portion 310 .

[0083] In this embodiment, the free portion 320 is disposed on a side of the fixed portion 310 close to the brush head 60, so that the output shaft 210 drives the free portion 320 to deform first compared to the fixed portion 310. Since the free portion 320 is suspended, the free portion 320 has a better rebound effect and deformation ability. The arrangement of the free portion 320 of the present application improves the deformation compatibility of the elastic member 30 and avoids the phenomenon that the elastic member 30 cannot rebound.

[0084] During the process of brushing teeth, after the user applies external force, the output shaft 210 is subjected to the reaction force to press against the free part 320 of the elastic member 30, and the free part 320 undergoes elastic deformation. The sensor 40 converts the elastic deformation of the free part 320 into an electrical signal and sends it to the controller for pressure detection. When the reaction force on the output shaft 210 is too large, the output shaft 210 drives the free part 320 to deform and starts to press against the fixed part 310. The fixed part 310 presses against the output shaft 210 in the opposite direction, limiting the output shaft 210 from pressing against the free part 320 to prevent the free part 320 from exceeding the maximum elastic deformation. At the same time, the fixed part 310 and the free part 320 share the pressing force of the output shaft 210, which is more conducive to the rapid rebound of the elastic member 30. The structural setting of the free part 320 and the fixed part 310 realizes double deformation, which is conducive to the protection of the elastic member 30, and avoids the problem that the free part 320 exceeds the maximum elastic deformation, resulting in insensitivity or failure caused by the inability to rebound.

[0085] In this embodiment, if Figures 3 to 6 As shown, the elastic member 30 has a hollow slit 330, that is, the hollow slit 330 is a hollow part, and the elastic member 30 is divided into a free part 320 and a fixed part 310 with the hollow slit 330 as the boundary. Among them, the hollow slit 330 is used to form a suspended setting of the free part 320, and the hollow slit 330 is used to facilitate the elastic deformation of the free part 320. It should be understood that the hollow slit 330 facilitates the free part 320 to better elastically deform, and the output shaft 210 abuts against the periphery of the hollow part, which belongs to the output shaft 210 abutting against the hollow part protected by the present application.

[0086] Specifically, the hollow gap ensures partial separation of the free part 320 and the fixed part 310, and the free part 320 is less restricted, so that when force is applied to the free part 320, it is easier to deform, and the sensor 40 can provide timely feedback to improve the accuracy of pressure detection of the electric toothbrush; and the free part 320 and the fixed part 310 are solid structures without holes and seams, which can enhance the service life of the free part 320 and the fixed part 310. On the whole, the elastic part 30 can achieve better pressure detection and has a longer service life.

[0087] In this embodiment, the specific structure of the free portion 320 can be a straight structure, and the free portion 320 can also be a bent structure. It can be understood that the straight structure and the bent structure refer to the overall extension structure of the free portion 320. The straight structure is formed as a straight extension structure, and the bent structure is formed as a structure with a bent extension. It should be noted that the bent structure can be a structure with multiple bends, and the bend can be formed between two linear extension structures, or it can be a circular arc bend.

[0088] like Figures 3 to 6 As shown, in this embodiment, the fixing portion 310 includes two end portions 311 arranged at radial intervals along the output shaft 210 and a connecting plate 312 arranged between the two end portions 311. The two end portions 311 are fixed relative to the bracket 10. The connecting plate 312 is used to connect the two end portions 311. The two end portions 311 are used to be fixedly connected to the bracket 10 to complete the fixation of the fixing portion 310, so as to achieve stable installation of the elastic member 30.

[0089] Among them, the connecting plate 312 is located between the two end portions 311 and is used to support the output shaft 210 during the brushing process. The connecting plate 312 has a preset elastic deformation ability. Since the two ends of the connecting plate 312 are fixed and one end of the free portion 320 is suspended, the deformation ability of the connecting plate 312 is smaller than the deformation ability of the free portion 320. The two end portions 311 are used to be fixedly connected to the bracket 10 to complete the fixed installation of the fixed portion 310, so as to achieve a stable installation of the elastic member 30 as a whole. The connecting plate 312 is located between the two end portions 311. When the user brushes his teeth too hard, the deformation degree of the output shaft 210 increases, so that the output shaft 210 will resist the free portion 320 and continue to deform. After a certain degree, the output shaft 210 further resists the connecting plate 312. Then, under the action of such a large force, the fixed portion 310 will relatively provide an opposite force to the output shaft 210, so that the user feels the resistance to remind the user that the brushing force is large at this time, and the fixed portion 310 shares part of the force, which also prevents such a large force from causing the free portion 320 to exceed the elastic deformation range, which is beneficial to protecting the elastic member 30.

[0090] In other embodiments, a portion of the output shaft 210 may also directly abut the fixed portion 310 and the free portion 320 , so that the fixed portion 310 can directly share the abutting force of the free portion 320 , which is beneficial to prolonging the service life of the elastic member 30 .

[0091] In this embodiment, if Figure 6As shown, a notch 3121 is formed on the connecting plate 312, a first end of the free portion 320 is connected to at least one of the two end portions 311 and the connecting plate 312, a second end of the free portion 320 is suspended inside the notch 3121, and a hollow gap 330 is formed between the portion of the free portion 320 arranged inside the notch and the inner wall surface of the notch, so that the free portion 320 and the fixed portion 310 are arranged more compactly, which is beneficial to the small size design of the electric toothbrush; and the connecting plate 312 accommodates the free portion 320 by means of the notch 3121, which also makes the connecting plate 312 have a more continuous structure at the non-opening portion, which is beneficial to improving the strength of the connecting plate 312, and further beneficial to sharing the force of the output shaft for the free portion 320.

[0092] The first end of the free portion 320 is a cantilever end 322, which is used to connect the free portion 320 with the fixed portion 310 so that the free portion 320 and the fixed portion 310 form a whole. The second end of the free portion 320 is an extended end 321, which is formed inside the notch 3121. The extended end 321 is suspended in the air and has better deformation ability. The sensor 40 is arranged on one side of the extended end 321 to detect the deformation of the extended end 321 and then convert it into an electrical signal and send it to the controller for pressure feedback.

[0093] In this embodiment, the structural arrangement of the extended end 321 and the cantilever end 322 can be as follows: Figure 6 As shown, the first end of the free portion 320 is connected to the end 311 of one of the fixed portions 310, and the second end of the free portion 320 is extended toward the end 311 of the other fixed portion 310. The extended end 321 is extended in a direction parallel to the connecting plate 312, and the output shaft 210 abuts against the extended end 321. Since the position where the cantilever end 322 is connected to the end 311 does not abut against the output shaft 210, it is beneficial to realize that the output shaft 210 drives the free portion 320 to deform, thereby improving the measurement accuracy of the sensor 40.

[0094] The structural setting of the extended end 321 and the cantilever end 322 can also be that the first end of the free part 320 is connected to the connecting plate 312, the second end of the free part 320 extends along the axial direction of the output shaft 210, and the extended end 321 is extended in a direction perpendicular to the connecting plate 312.

[0095] The axial direction of the output shaft 210 is Figure 1 In the X direction shown, the radial direction of the output shaft 210 is Figure 1 Y direction shown.

[0096] When the user is brushing his teeth, if the user applies too much force, the output shaft 210 will first abut against the protruding end 321 after being subjected to the force. After the user applies a greater force, the output shaft 210 begins to abut against the connecting plate 312, and the deformation capabilities of the protruding end 321 and the connecting plate 312 are successively reduced, thereby achieving reverse abutment against the output shaft 210, thereby preventing the elastic deformation of the protruding end 321 of the free portion 320 from exceeding the maximum elastic deformation, resulting in a phenomenon of being unable to rebound. The structural setting of the elastic member 30 of the present application increases the service life of the elastic member 30.

[0097] like Figures 7 to 10 As shown, the electric toothbrush further includes a flexible member 50 , at least a portion of which is disposed between the free portion 320 and the output shaft 210 , and the output shaft 210 drives the free portion 320 to deform through the flexible member 50 .

[0098] Specifically, by setting the flexible member 50, the flexible member 50 is relatively soft. The flexible member 50 is set between the output shaft 210 and the free portion 320, which can buffer the contact between the output shaft 210 and the free portion 320, avoid direct hard contact between the output shaft 210 and the free portion 320 to cause aggravated vibration, and reduce the noise generated by the hard contact between the output shaft 210 and the free portion 320; and because the flexible member 50 is relatively soft, the output shaft 210 is avoided from hard contact with the free portion 320, and at the same time, it is further prevented from being subjected to excessive force or excessive force on the free portion 320, which causes the free portion 320 to be unable to rebound to the initial state after deformation, thereby improving the service life of the elastic member 30 and further enhancing the stability of the electric toothbrush.

[0099] In order to improve the installation stability of the flexible member 50 , the free portion 320 has a protruding structure 3211 extending toward one side of the flexible member 50 . The flexible member 50 has a limiting groove 510 , and at least a portion of the protruding structure 3211 extends into the limiting groove 510 .

[0100] The protruding structure 3211 may be one or more. When there are more than one protruding structure 3211 , it is beneficial to further improve the stability of the connection between the free portion 320 and the flexible member 50 .

[0101] The end surface of the protrusion structure 3211 may be circular, elliptical, rectangular, polygonal or other irregular shapes.

[0102] It is understandable that the protruding structure 3211 and the limiting groove 510 may also be arranged interchangeably, that is, the protruding structure 3211 is arranged on the flexible member 50 , and the limiting groove 510 is arranged on the free portion 320 .

[0103] By providing the protruding structure 3211 and the limiting groove 510 structure to realize the limiting installation of the flexible member 50 and the free portion 320, the relative slip between the protruding structure 3211 and the limiting groove 510 is avoided, which is conducive to improving the stability of the installation between the flexible member 50 and the free portion 320, and then when the output shaft 210 moves toward the free portion 320, the output shaft 210 first squeezes the flexible member 50, reduces the shaking of the flexible member 50, and can reduce noise. At the same time, the protruding structure 3211 and the limiting groove 510 can realize the installation positioning, and further facilitate the installation of the flexible member 50 and the elastic member 30. In other embodiments, the flexible member 50 and the free portion 320 can also be fixed by bonding or by fasteners to realize the connection between the flexible member 50 and the free portion 320; of course, the flexible member 50 and the output shaft 210 can also be fixed by bonding or by fasteners.

[0104] In one specific implementation of this embodiment, the flexible member 50 is a soft rubber sleeve. The soft rubber sleeve is sleeved on the outside of the output shaft 210, and the soft rubber sleeve is fixedly connected to the output shaft 210. The outer peripheral wall of the output shaft 210 is the outer peripheral wall of the soft rubber sleeve, and the free portion 320 abuts against the outer peripheral wall of the soft rubber sleeve.

[0105] By setting the flexible member 50 as a soft rubber sleeve, the output shaft 210 indirectly abuts against the outer peripheral wall of the output shaft 210 through the soft rubber sleeve, so that the free portion 320 can abut against the soft rubber sleeve, so that when the motor vibrates, the wear of the output shaft 210 and the free portion 320 can be reduced, the structural strength of the output shaft 210 and the free portion 320 can be ensured, and the service life of the electric toothbrush can be extended. In addition, the hardness of the soft rubber sleeve is softer than that of the output shaft 210, which can reduce the noise generated by the contact or friction between the output shaft 210 and the elastic member 30 when the motor vibrates, thereby improving the user experience.

[0106] In one specific implementation of this embodiment, a mounting portion that is matched and connected with the soft rubber sleeve is provided on the output shaft 210. The soft rubber sleeve is matched and connected with the mounting portion.

[0107] By setting a mounting portion on the output shaft 210, a mounting position is provided for the soft rubber sleeve, and the installation stability of the soft rubber sleeve is improved, thereby improving the stability of the electric toothbrush; at the same time, when the electric toothbrush is produced and assembled, the setting of the mounting portion can better enable the soft rubber sleeve to be installed, which is conducive to improving installation and production efficiency.

[0108] In one specific implementation of this embodiment, the mounting portion is a groove structure arranged on the outside of the output shaft 210. The soft rubber sleeve is located in the groove structure, and the soft rubber sleeve and the groove structure are interference fit.

[0109] By setting the mounting portion as a groove structure, the structure of the mounting portion can be simplified, thereby reducing the difficulty of processing the output shaft 210. In addition, by setting the mounting portion as a groove structure, at least part of the structure of the soft rubber sleeve can be embedded in the output shaft 210, which can increase the connection stability between the soft rubber sleeve and the output shaft 210. The soft rubber sleeve is engaged in the groove structure in the axial direction of the output shaft 210, thereby improving the connection stability between the soft rubber sleeve and the output shaft 210. By making the soft rubber sleeve and the groove structure interference fit, the soft rubber sleeve can be prevented from rotating relative to the output shaft 210, reducing the shaking of the soft rubber sleeve, and reducing noise.

[0110] In one specific implementation of this embodiment, the flexible member 50 is a soft rubber member. The soft rubber member is attached to the free portion 320 , and the output shaft 210 abuts against the free portion 320 by abutting against the soft rubber member. The hardness of the soft rubber member is less than the hardness of the elastic member 30 .

[0111] By setting the flexible member 50 as a soft rubber member, the design flexibility of the electric toothbrush can be increased. By attaching the soft rubber member to the free portion 320, so that the output shaft 210 abuts against the free portion 320 through the soft rubber member, the wear of the free portion 320 by the output shaft 210 can be reduced. By setting the hardness of the soft rubber member to be smaller than the hardness of the elastic member 30, the noise generated when the motor vibrates and contacts the elastic member 30 can be reduced, thereby improving the user experience.

[0112] In one specific implementation of this embodiment, the soft rubber part is a gasket, which is arranged between the free portion 320 and the output shaft 210 , and the output shaft 210 abuts against the free portion 320 by abutting against the gasket.

[0113] By configuring the soft rubber part as a gasket with a sheet structure, the structure of the soft rubber part can be simplified, the difficulty of processing the soft rubber part can be reduced, and the cost can be reduced.

[0114] In one specific implementation of this embodiment, the surface of the flexible member 50 is provided with a texture to reduce the surface friction coefficient of the flexible member 50 .

[0115] The surface of the flexible part 50 is textured, which helps to reduce the surface friction coefficient of the flexible part 50, so that when the output shaft 210 contacts the flexible part 50, or the flexible part 50 contacts the elastic part 30, the smaller friction coefficient is more conducive to the relative rotation of the output shaft 210 and the flexible part 50, or the flexible part 50 and the free part 320, which further helps to reduce the noise of the electric toothbrush.

[0116] In one specific implementation of this embodiment, the flexible member 50 is thermoplastic polyurethane rubber.

[0117] The flexible part 50 of thermoplastic polyurethane rubber is TPU flexible part 50. This type of flexible part 50 has a relatively small friction coefficient, which is also helpful in reducing the noise between the output shaft 210 and the flexible part 50, or the flexible part 50 and the free part 320, thereby improving the user experience.

[0118] like Figures 8 to 10 As shown, the bracket 10 also has a limiting portion 111. In order to prevent the elastic member 30 from being damaged due to excessive force applied by the user during brushing, thereby affecting the normal use of the electric toothbrush, the limiting portion 111 is formed on the bracket 10. The limiting portion 111 abuts against the output shaft 210 to limit the elastic deformation caused by the output shaft 210 abutting against the elastic member 30.

[0119] Specifically, the limiting portion 111 is provided to abut against the output shaft 210 to limit the output shaft 210 , thereby preventing the output shaft 210 from abutting against the elastic member 30 , causing the elastic member 30 to exceed its elastic limit and fail to rebound.

[0120] In this embodiment, the structure of the limiting portion 111 may be a convex plate structure provided on the bracket 10 , and only one convex plate structure may be provided, or a plurality of convex plate structures may be used to cooperate to support the limiting output shaft 210 .

[0121] When the convex plate structure is provided, the convex plate structure forms a supporting surface, and the supporting surface can be a plane or an arc surface extending along the circumference of the output shaft 210 .

[0122] When multiple convex plate structures are provided, each convex plate structure forms a supporting surface. The multiple supporting surfaces may be coplanar, or may be coplanar to form an arcuate surface extending along the circumference of the output shaft 210 .

[0123] In this embodiment, the output shaft 210 is limited by setting the limiting portion 111, thereby ensuring the amplitude of the output shaft 210 against the elastic member 30. The amplitude of the output shaft 210 is Figure 8 The amplitude B shown limits the elastic deformation of the elastic member 30, thereby ensuring that the elastic member 30 can deform and rebound normally, which is conducive to repeated use, increases the service life of the elastic member 30, and facilitates pressure detection by the sensor 40.

[0124] The vertical distance between the limiting portion 111 and the output shaft 210 is smaller than or equal to the maximum elastic deformation of the elastic member 30 , so as to ensure that the setting of the limiting portion 111 has the effect of enabling the elastic member 30 to work normally.

[0125] Specifically, by adopting a vertical distance value between the limit portion 111 and the output shaft 210 that is less than or equal to the maximum elastic deformation value of the elastic member 30, it is ensured that the elastic member 30 will not exceed the maximum elastic deformation of the elastic member 30, thereby ensuring the normal operation of the elastic member 30, avoiding the phenomenon of being unable to rebound, and increasing the service life of the elastic member 30.

[0126] In this embodiment, the thickness of the flexible member 50 is less than or equal to the vertical distance between the limit portion 111 and the output shaft 210, so that when the output shaft 210 drives the brush head 60 to vibrate, the output shaft 210 drives the elastic member 30 to undergo elastic deformation through the flexible member 50, and then performs pressure detection through the sensor 40.

[0127] Specifically, in the present application, by adopting a thickness value of the flexible part 50 that is less than or equal to the vertical distance value between the limiting part 111 and the output shaft 210, it is ensured that the limiting part can achieve swing limiting of the output shaft 210. At the same time, it also avoids the flexible part being too thick, squeezing the elastic part 30 beyond the maximum elastic deformation, resulting in the elastic part 30 being unable to rebound normally, thereby improving the service life of the elastic part 30.

[0128] When the user is brushing his teeth, if the force is too great, the output shaft 210 is acted upon by the reverse force and drives the elastic member 30 to undergo elastic deformation. When the output shaft 210 drives the elastic member 30 to undergo elastic deformation and approaches the maximum elastic deformation of the elastic member 30, the output shaft 210 abuts against the limiting portion 111, thereby limiting the output shaft 210 from continuing to squeeze the elastic member 30. The limiting portion 111 limits the movement of the output shaft 210, thereby preventing the elastic member 30 from exceeding the elastic deformation and being unable to rebound.

[0129] In this embodiment, the limiting portion 111 is provided with a rotation limiting portion along the circumferential direction of the output shaft 210, and the rotation limiting portion is used to limit the rotation angle of the output shaft 210. Specifically, the rotation angle of the output shaft 210 is limited by setting the rotation limiting portion to ensure that the output shaft 210 rotates within a preset rotation angle range, so as to improve the controllability of the output shaft 210.

[0130] In this embodiment, the rotation limiting portion can be a groove structure extending along the circumference of the output shaft 210, and the output shaft 210 rotates inside the groove structure. The present application limits the rotation angle of the output shaft 210 by limiting the circumferential extension angle of the groove structure.

[0131] In this embodiment, the limiting portion 111 is provided with a notch portion. When the output shaft 210 is subjected to force and approaches the limiting portion 111 , the output shaft 210 can extend into the notch portion, and the wall of the notch portion covers a portion of the output shaft 210 . The wall of the notch portion can limit the radial movement of the output shaft 210 .

[0132] The radial movement of the output shaft 210 is limited by the structure of the notch portion, further avoiding the phenomenon that the elastic member 30 is supported by the output shaft 210 and exceeds the maximum elastic deformation of the elastic member 30, resulting in the inability to rebound, thereby increasing the service life of the elastic member 30. At the same time, the rotation angle of the output shaft 210 is limited by the notch portion, and the single structure of the limiting portion 111 can realize both the limitation of deformation and the limitation of the rotation angle, which is conducive to designing an electric toothbrush with a relatively small volume and optimizing the design.

[0133] Specifically, the structure of the notch portion is configured to support and limit the output shaft 210, thereby limiting the radial movement of the output shaft 210, and further preventing the elastic member 30 from being supported by the output shaft 210 beyond its elastic limit and being unable to rebound.

[0134] In this embodiment, the notch is formed as a groove structure, and the bottom surface of the groove structure is used to abut the output shaft 210 to achieve limiting. The bottom surface of the groove can be a plane or an arc surface, which can limit the radial movement of the output shaft 210.

[0135] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0136] The elastic member 30 of the electric toothbrush of the present application has a hollow part, and the output shaft 210 of the driving member 20 abuts against the hollow part. The vibration of the output shaft 210 of the driving member 20 drives the hollow part to undergo elastic deformation, and the sensor 40 converts the elastic deformation of the hollow part into an electrical signal. The setting of the hollow part makes the elastic member 30 more elastic, and the setting of the hollow part makes the elastic member 30 have a greater degree of deformation and greater deformation compatibility; at the same time, the setting of the hollow part facilitates elastic deformation, thereby improving the detection accuracy of the sensor 40.

[0137] The electric toothbrush of the present application adopts the arrangement of the sensor 40 on one side of the elastic member 30, so as to conveniently convert the elastic deformation of the elastic member 30 into an electrical signal. Compared with the related art in which the sensor 40 (for example, a pressure sensor) is directly connected to the output shaft 210, the technical solution of the present application can prevent the problem of the connection line 80 of the sensor 40 being broken due to the rotation of the output shaft 210 when the electric toothbrush is not in use, so as to ensure the normal use of the electric toothbrush.

[0138] Obviously, the above described embodiments are only a part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, ordinary technicians in this field can make other different forms of changes or modifications without creative work, which should fall within the scope of protection of the utility model.

Claims

1. An electric toothbrush, characterized in that: include: Bracket (10); A driving member (20) is partially disposed inside the bracket (10), and an output shaft (210) of the driving member (20) extends out of the bracket (10); an elastic member (30), wherein at least a portion of the elastic member (30) is hollowed out, and a portion of the output shaft (210) abuts against the hollowed-out portion of the elastic member (30); A sensor (40) is arranged on one side of the elastic member (30), and the sensor (40) is used to convert the elastic deformation of the elastic member (30) into an electrical signal.

2. The electric toothbrush according to claim 1, characterized in that: The elastic member (30) is a metal plate, and a plurality of holes are provided on the metal plate to enhance the elastic deformation capability of the elastic member (30).

3. The electric toothbrush according to claim 1, characterized in that: The elastic member (30) comprises a fixed portion (310) and a free portion (320), the fixed portion (310) being fixed relative to the bracket (10), a first end of the free portion (320) being connected to the fixed portion (310), a second end of the free portion (320) being suspended, and a portion of the output shaft (210) being in contact with the free portion (320); The sensor (40) is arranged on one side of the free portion (320).

4. The electric toothbrush according to claim 3, characterized in that: The elastic member (30) is provided with a hollow gap (330), and the elastic member (30) is divided into the free portion (320) and the fixed portion (310) with the hollow gap (330) as a boundary.

5. The electric toothbrush according to claim 3, characterized in that: Part of the output shaft (210) abuts against the fixed portion (310) and the free portion (320).

6. The electric toothbrush according to claim 3, characterized in that: The free portion (320) is a straight structure or a bent structure.

7. The electric toothbrush according to claim 3, characterized in that: The fixing portion (310) comprises two end portions (311) arranged at intervals along the radial direction of the output shaft (210) and a connecting plate (312) arranged between the two end portions (311); the two end portions (311) are fixed relative to the bracket (10).

8. The electric toothbrush according to claim 7, characterized in that: A notch (3121) is formed on the connecting plate (312), a first end of the free portion (320) is connected to at least one of the end portion (311) of the fixed portion (310) and the connecting plate (312), and a second end of the free portion (320) is suspended inside the notch (3121).

9. The electric toothbrush according to claim 7, characterized in that: The first end of the free portion (320) is connected to one of the end portions (311), and the second end of the free portion (320) is extended toward the other end portion (311); or A first end of the free portion (320) is connected to the connecting plate (312), and a second end of the free portion (320) extends along the axial direction of the output shaft (210).

10. The electric toothbrush according to claim 3, characterized in that: The electric toothbrush further comprises a flexible member (50), at least a portion of which is arranged between the free portion (320) and the output shaft (210), and the output shaft (210) drives the free portion (320) to deform through the flexible member (50).

11. The electric toothbrush according to claim 10, characterized in that: The free portion (320) has a protruding structure (3211) extending toward one side of the flexible member (50), the flexible member (50) has a limiting groove (510), and at least a portion of the protruding structure (3211) extends into the interior of the limiting groove (510).

12. The electric toothbrush according to claim 10, characterized in that: The flexible member (50) is sleeved on the output shaft (210); or The flexible member (50) is a gasket, and the gasket is arranged between the free portion (320) and the output shaft (210), and the output shaft (210) abuts against the free portion (320) by abutting against the gasket.

13. The electric toothbrush according to any one of claims 1 to 12, characterized in that: The bracket (10) also has a limiting portion (111), the limiting portion (111) being arranged on the bracket (10), and the limiting portion (111) abuts against the output shaft (210) to limit the elastic deformation generated by the output shaft (210) abutting against the elastic member (30).

14. The electric toothbrush according to claim 13, characterized in that: The vertical distance value between the limiting portion (111) and the output shaft (210) is less than or equal to the maximum elastic deformation value of the elastic member (30).

15. The electric toothbrush according to claim 13, characterized in that: The electric toothbrush further comprises a flexible member (50), wherein the thickness of the flexible member (50) is less than or equal to the vertical distance between the limiting portion (111) and the output shaft (210).

16. The electric toothbrush according to claim 13, characterized in that: The limiting portion (111) is provided with a rotation limiting portion along the circumferential direction of the output shaft (210), and the rotation limiting portion is used to limit the rotation angle of the output shaft (210).

17. The electric toothbrush according to claim 13, characterized in that: The limiting portion (111) is provided with a notch portion, and when the output shaft (210) is forced to approach the limiting portion (111), the output shaft (210) can extend into the notch portion, and a wall of the notch portion is formed to cover a portion of the output shaft (210), and the wall of the notch portion can limit radial movement of the output shaft (210).

18. The electric toothbrush according to any one of claims 1 to 12, characterized in that: The bracket (10) comprises a first bracket (110) and a second bracket (120); the first bracket (110) and the second bracket (120) are buckled together to form a mounting cavity; an end of the first bracket (110), or an end of the second bracket (120), or an end after the first bracket (110) and the second bracket (120) are buckled together has an opening; a portion of the driving member (20) is arranged inside the mounting cavity; the output shaft (210) passes through the opening of the end; the elastic member (30) is arranged on the first bracket (110) and / or the second bracket (120); and the elastic member (30) is located at the position of the end opening.

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