Electric toothbrush

Abstract

The embodiment of the utility model provides an electric toothbrush. The electric toothbrush comprises a brush head and a motor. The motor comprises a shell, a first driving mechanism, a second driving mechanism and an output shaft. The first driving mechanism, the second driving mechanism and the output shaft are all arranged in the shell, an extending hole is formed in one end of the shell, and the end of the output shaft penetrates through the extending hole and is connected with the brush head. The first driving mechanism and the second driving mechanism are both connected with the output shaft. The first driving mechanism is constructed to drive the output shaft to rotate relative to the axis of the output shaft and can drive the brush head to generate high-frequency vibration, and the cleaning function of the electric toothbrush is achieved. The second driving mechanism is configured to drive the output shaft to reciprocate in the axial direction of the output shaft and can drive the brush head to linearly reciprocate in the axial direction of the output shaft, so that the brush head can perform reciprocating cleaning on a certain position of the teeth. According to the electric toothbrush, the cleaning strength of the electric toothbrush can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of oral cleaning equipment, and in particular to an electric toothbrush. Background Art

[0002] As electronic products for personal care, oral cleaning appliances such as electric toothbrushes are increasingly accepted by users. At present, electric toothbrushes usually use a motor to drive the brush head to produce high-frequency motion to instantly break down toothpaste into fine foam to clean the user's mouth. With the continuous development of technology, people have higher requirements for the cleaning degree of electric toothbrushes, which means that the cleaning power of electric toothbrushes needs to be improved. Utility Model Content

[0003] The embodiment of the present application provides an electric toothbrush that can enhance the cleaning power of the electric toothbrush.

[0004] The embodiment of the present application provides an electric toothbrush. The electric toothbrush comprises:

[0005] Brush head;

[0006] The motor comprises a housing, a first driving mechanism, a second driving mechanism and an output shaft. The first driving mechanism, the second driving mechanism and the output shaft are all arranged in the housing. One end of the housing is provided with an extension hole. The end of the output shaft is provided with the extension hole and connected to the brush head. The first driving mechanism and the second driving mechanism are both connected to the output shaft.

[0007] The first driving mechanism is configured to drive the output shaft to rotate relative to its own axis, and the second driving mechanism is configured to drive the output shaft to reciprocate along its own axis.

[0008] The electric toothbrush of the embodiment of the present application is provided with a first driving mechanism, so that when the first driving mechanism drives the output shaft to rotate rapidly around its own axis, it can drive the brush head to generate high-frequency vibrations, thereby realizing the cleaning function of the electric toothbrush. The second driving mechanism is provided, so that when the output shaft moves back and forth along its own axial direction under the drive of the second driving mechanism, it can drive the brush head to make linear reciprocating motion in the axial direction of the output shaft, so that the brush head can reciprocate and clean a certain position of the teeth. Therefore, the embodiment of the present application is provided with the first driving mechanism and the second driving mechanism, so that the brush head has two motion modes of high-frequency vibration and linear reciprocating motion under the drive of the output shaft. Through the coordination of these two motion modes of the brush head, the cleaning power of the electric toothbrush can be improved.

[0009] In some embodiments, the electric toothbrush further comprises:

[0010] The detection assembly includes a magnetic member and a detection member, wherein the magnetic member is sleeved on the circumferential side wall of the output shaft and rotates synchronously with the output shaft; the detection member can confirm the rotation angle of the output shaft by detecting the rotation angle of the magnetic member;

[0011] A circuit board, the detection element is arranged on the circuit board, the circuit board is provided with a through hole, and the output shaft passes through the through hole;

[0012] The reset member is arranged in the shell, and a side of the reset member close to the shell is fixed relative to the shell. The circuit board is fixedly arranged on the reset member, and parts of the circuit board and the reset member can reciprocate with the output shaft.

[0013] Due to the setting of the detection component, the circuit board can confirm the rotation angle of the output shaft according to the detection member, and accurately detect the rotation angle of the output shaft in the circumferential direction. Compared with the traditional physical structure to limit the angle of the output shaft, the circuit board of the embodiment of the present application is more accurate through circuit control, and further reverse control of the output shaft rotation is more timely. This will make the movement of the output shaft more stable, which is conducive to the electric toothbrush to accurately deep clean the teeth and is convenient for users to use.

[0014] In some embodiments, the reset member includes a clamping portion, which extends axially along the output shaft; the clamping portion is penetrated by a through hole, and a portion of the clamping portion passes through the through hole to clamp one side of the circuit board, and the clamping portion is gap-matched with the circuit board.

[0015] By clamping the clamping part with the circuit board, the circuit board can be limited in the axial direction of the output shaft, so that the circuit board is fixed to the reset part and will not move relative to the reset part along the axial direction of the output shaft. In this way, the distance between the detection part and the magnetic part in the axial direction of the output shaft can always be kept consistent, so as to ensure the detection accuracy and detection stability of the rotation angle of the magnetic part by the detection part, and then ensure the precise control of the rotation of the output shaft by the circuit board. In addition, the clamping part partially passes over one side of the through-hole clamping circuit board, so that when the circuit board moves along the axial direction with the output shaft, the clamping part can ensure the stability of the circuit board relative to the reset part by hooking the circuit board, which is further conducive to the accurate detection of the rotation angle of the output shaft. In addition, by setting the clearance fit between the clamping part and the circuit board, the problem of deformation of the circuit board caused by interference fit can be avoided, thereby ensuring that the detection accuracy and stability of the detection part will not be reduced due to the deformation of the circuit board.

[0016] In some embodiments, the through hole includes an avoidance hole and an avoidance gap, and the wall of the avoidance hole is concave toward the shell side to form the avoidance gap; the position of the clamping part corresponds to the position of the avoidance gap, so that the clamping part clamps one side of the circuit board.

[0017] By cooperating between the wall of the avoidance gap and the clamping portion, the circuit board can be limited in the circumferential direction of the output shaft, so as to reduce or even avoid positional deviation of the circuit board in the circumferential direction of the output shaft when the output shaft makes a linear reciprocating movement, thereby affecting the detection accuracy and stability of the detection component.

[0018] In some embodiments, along the circumference of the output shaft, the gap between the clamping portion and the wall forming the avoidance gap is greater than 0 mm and less than or equal to 0.3 mm, so that when the output shaft makes a linear reciprocating movement, the possible position deviation of the circuit board in the circumferential direction of the output shaft can be controlled within the smallest possible range, so that the clamping portion and the circuit board gap can cooperate to achieve absolute physical fixation, so as to ensure that when the output shaft makes a linear reciprocating movement, the positions of the detection part and the magnetic part in the axial direction of the output shaft are relatively stable, which can further improve the detection accuracy and stability of the detection part.

[0019] In some embodiments, along the radial direction of the output shaft, the gap between the clamping portion and the wall forming the avoidance gap is less than or equal to 0.1 mm. With this arrangement, when the output shaft makes a linear reciprocating movement, the circuit board will not have a positional deviation greater than 0.2 mm in the radial direction of the output shaft, and absolute physical fixation can be achieved, ensuring that when the output shaft makes a linear reciprocating movement, the positions of the detection member and the magnetic member in the axial direction of the output shaft are relatively stable.

[0020] In some embodiments, the circuit board and the reset member can be bonded and fixed relative to the deformed portion of the housing. This arrangement can enhance the stability of the connection between the circuit board and the reset member while not affecting the reciprocating movement of the circuit board and the reset member with the output shaft, so as to further ensure that when the output shaft is reciprocating in a straight line, the positions of the detection member and the magnetic member in the axial direction of the output shaft are relatively stable.

[0021] In some embodiments, the first driving mechanism includes a driving cable; a tensile wire is provided in the motor, and the driving cable is electrically connected to the circuit board through the tensile wire, so that the circuit board can drive the output shaft to rotate through the first driving mechanism;

[0022] The wire diameter of the tensile wire is 1.2 to 3 times the wire diameter of the drive cable.

[0023] When the output shaft rotates or moves axially, it will pull the tension wire; especially when moving axially, the instantaneous rapid movement of the output shaft will pull the tension wire. When the diameter of the tension wire is 1.2 to 3 times the diameter of the first drive cable, the connection strength and stability of the electrical connection between the circuit board and the first drive mechanism can be enhanced, so as to further improve the service life and signal stability of the motor.

[0024] In some embodiments, the length L of the tensile wire needs to satisfy the following conditions:

[0025]

[0026] Wherein, D is the maximum displacement of the output shaft in the axial direction, a is a coefficient, and the coefficient is greater than or equal to 2 and less than or equal to 10.

[0027] By limiting the length L of the tensile wire, it can be ensured that the length of the tensile wire is at least equal to the shortest length required by the tensile wire when the output shaft moves to the maximum displacement in the axial direction, so as to ensure that when the circuit board is electrically connected to the first drive cable through the tensile wire, it will not affect the axial movement of the output shaft.

[0028] In some embodiments, the frequency of the motor is 210 Hz. Such a configuration can ensure that when the frequency of the motor is 210 Hz, when the circuit board is electrically connected to the first drive cable through the tensile wire, the axial movement of the output shaft is not affected.

[0029] In some embodiments, a guide groove is provided on the circumferential outer side of the reset member, and the guide groove allows the tensile wire to pass through so that the tensile wire is electrically connected to the drive cable.

[0030] In this way, while the circuit board is electrically connected to the first drive cable through the anti-tensile wire, the anti-tensile wire can be guided through the guide groove, so that when the output shaft moves in the axial direction, the anti-tensile wire can move in the guide groove, thereby improving the stability of the electrical connection between the circuit board and the first drive cable; at the same time, the setting of the guide groove also reduces the friction of other parts on the anti-tensile wire, further protects the anti-tensile wire, and extends the service life of the electric toothbrush.

[0031] In some embodiments, the electric toothbrush also includes a protective cover, which is arranged in the guide groove. Part of the tensile wire is inserted into the protective cover. When the output shaft moves back and forth, the tensile wire can move relative to the protective cover to reduce the wear and deformation caused by direct contact between the tensile wire and the reset part or other structures in the shell, thereby improving the service life and stability of the tensile wire.

[0032] In some embodiments, the motor includes a winding bracket, the winding bracket includes a fixing portion and a plurality of winding portions, the fixing portion is fixedly disposed on the housing, the plurality of winding portions are disposed on a side of the fixing portion away from the housing, and the winding portions extend in a circumferential direction;

[0033] Among them, the length of multiple winding parts along the circumferential direction accounts for at least 55% of the circumference of the circle where the winding parts are located. Such a configuration can ensure that a single winding part has a larger length in the extension direction, and the winding bracket can be structurally adjusted to enhance the strength and deformation resistance of the winding part, thereby ensuring the winding uniformity and service life of the drive cable in the winding bracket; in particular, there will be a pre-tightening force when the drive cable is wound around the winding part, and the pre-tightening force will continue to act on the winding part for a long time. By changing the structure of the winding bracket, the winding part can be prevented from collapsing after long-term use, which is beneficial to increasing the service life of the electric toothbrush. In some embodiments, the part of the output shaft located inside the shell is provided with a structural member;

[0034] The electric toothbrush further comprises a resisting member, which is arranged on the shell, and at least a part of the resisting member can resist the output shaft to reduce vibration or resonance between the output shaft and the structural member.

[0035] With such a configuration, the output shaft has an axial movement mode, and most of the components (including structural components) arranged on the output shaft need to move axially with the output shaft and cannot be fixed relative to the housing. In this way, during the high-frequency movement of the motor, this will cause vibration or resonance between the output shaft and some components. In contrast, the embodiment of the present application uses a supporting member to support the output shaft, which can make the output shaft and the structural components thereon relatively more compact or closer, thereby reducing the vibration or resonance between the output shaft and the structural components, further reducing noise, and improving the user experience.

[0036] In some embodiments, at least a portion of the resisting member is disposed on a wall forming the extension hole, and the resisting member resists a portion of the output shaft in a circumferential direction around the output shaft, so that the resisting member can provide a resisting force for the output shaft in a radial direction of the output shaft.

[0037] The arrangement of the abutment member on the wall forming the extension hole can reduce the volume occupied by the abutment member, which is further conducive to reducing the volume of the electric toothbrush. In addition, this abutment force will make the output shaft and the structural member more closely attached, so that the output shaft and the structural member have better integrity, which can reduce the possibility of resonance between the output shaft and the structural member during high-frequency vibration, thereby reducing noise and improving user experience.

[0038] In some embodiments, the supporting member is annular, the output shaft passes through the supporting member, and part of the supporting member is interference fit with the output shaft so that the supporting member supports part of the output shaft in the circumferential direction of the output shaft, so that the supporting member can provide a supporting force for the output shaft in the radial direction of the output shaft.

[0039] With such a configuration, the annular abutment is conveniently fixedly mounted relative to the wall of the extension hole, further facilitating the improvement of the assembly production efficiency of the electric toothbrush. In addition, by making the abutment part and the output shaft interfere with each other, the structural configuration is simplified, and the noise is reduced through the sophisticated structure, which is conducive to optimizing the structural design of the electric toothbrush and further facilitating the production of an electric toothbrush with a relatively small volume.

[0040] In some embodiments, the portion of the abutment that is interference fit with the output shaft occupies at least one sixth of the circumferential side wall of the abutment and is less than one half of the circumferential side wall of the abutment.

[0041] With such a configuration, by limiting the proportion of the portion of the interference fit between the abutment and the output shaft to the circumferential side wall of the abutment, the area of ​​the interference fit between the abutment and the output shaft can be limited to a more appropriate range, thereby ensuring that the abutment and the output shaft have a sufficient area for interference fit, so that the abutment force generated by the abutment makes the output shaft fit tightly against the structural member.

[0042] In some embodiments, the interference thickness between the abutment and the output shaft is greater than or equal to 0.2 mm and less than or equal to 0.8 mm, so that the interference thickness d between the abutment and the output shaft and the abutment force can be controlled within a more appropriate range, so that the abutment force generated by the abutment can make the output shaft and the structural member fit tightly;

[0043] And / or, the hardness of the interference fit portion between the abutment and the output shaft is greater than or equal to 40 Shore degrees and less than or equal to 70 Shore degrees, so that the hardness of the interference fit portion between the abutment and the output shaft and the abutment force can be controlled within a more appropriate range, so that the abutment force generated by the abutment can make the output shaft and the structural member fit tightly; and while preventing the abutment from being too small in hardness to provide a stable abutment force, it can also prevent the abutment from being too large in hardness to damage the output shaft.

[0044] In some embodiments, the structural member is a bearing, and the bearing sleeve is arranged on the circumferential side wall of the output shaft so that the bearing is arranged on the output shaft. The output shaft is supported by the supporting member, so that there is a preload force between the output shaft and the inner ring of the bearing. Furthermore, the preload force will make the inner ring of the bearing, the steel balls inside the bearing, and the outer ring of the bearing relatively close in a certain area, so as to play a relatively fixed role for the steel balls. In this way, when the bearing moves with the output shaft, the steel balls are not easy to move, which can reduce the possibility of resonance between the output shaft and the bearing during high-frequency vibration, thereby reducing noise and improving the comfort of using the electric toothbrush.

[0045] In some embodiments, the output shaft is provided with a first stopper, and the housing includes a second stopper;

[0046] When the output shaft swings in the circumferential direction, the first limiter and the second limiter can make the output shaft swing back and forth within the range of 0° to 180°. In this way, regardless of whether the motor is started or stopped, the swing angle of the output shaft will be limited to within 180° under the action of the first limiter and the second limiter.

[0047] Compared with the output shaft rotating freely within the range of 360°, when the swing angle of the output shaft is limited to 180°, it can effectively reduce the difficulty of the algorithm control of the motor over the rotation of the output shaft, improve the control accuracy, reduce the power required to reset the output shaft to the zero point of rotation, and effectively increase the battery life of the product.

[0048] In some embodiments, the number of the second limiting members is two, the first limiting member is located between the two second limiting members, and the output shaft is limited by abutting against the second limiting members. In this way, by adjusting the positions of the two second limiting members on the housing, when the output shaft rotates in the circumferential direction, the output shaft can swing back and forth within a range of 0° to 180° through the abutment and cooperation between the first limiting member and the second limiting member.

[0049] In some embodiments, a pressure sensor is provided on the output shaft, and the pressure sensor is used to detect the force of brushing teeth, so that when the user uses the electric toothbrush, the electric toothbrush can detect the force of the user's brushing teeth, so that when the brushing force is detected to be too strong, the electric toothbrush can remind the user, so that the electric toothbrush has an overvoltage protection function, which can improve the user experience. At the same time, since the output shaft cannot rotate freely within a range of 360°, it can also avoid the problem of the cable electrically connecting the pressure sensor and the circuit board being wound and broken when the output shaft rotates 360°, so as to ensure the stability of the electrical connection between the pressure sensor and the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0051] Figure 1 A schematic diagram of the structure of a motor provided in an embodiment of the present application;

[0052] Figure 2 for Figure 1 The cross-section of the motor in the AA direction;

[0053] Figure 3 for Figure 2 Enlarged view of the middle motor at B;

[0054] Figure 4 A schematic diagram of an assembly of an output shaft, a circuit board and a reset member provided in an embodiment of the present application;

[0055] Figure 5 for Figure 4 Assembly exploded view;

[0056] Figure 6 A partial schematic diagram of a motor provided in an embodiment of the present application at an end away from the brush head;

[0057] Figure 7 for Figure 4 A schematic diagram of the structure of the center reset member;

[0058] Figure 8 for Figure 4 Enlarged view at D;

[0059] Fig. 9 A schematic diagram of the structure of a winding bracket provided in an embodiment of the present application;

[0060] Fig.10 An internal schematic diagram of a motor provided in an embodiment of the present application at one end adjacent to a brush head;

[0061] Fig.11 A partial schematic diagram of a motor provided in an embodiment of the present application at one end adjacent to a brush head;

[0062] Fig.12 A schematic diagram of the structure of a supporting member provided in an embodiment of the present application;

[0063] Fig.13 A schematic diagram of the interior of another motor provided in an embodiment of the present application, adjacent to one end of the brush head;

[0064] Fig.14 A schematic diagram of the interior of another motor provided in an embodiment of the present application, located near one end of the brush head.

[0065] Reference numerals:

[0066] 10-housing; 11-housing body; 12-first end cover; 13-second end cover; 14-second stopper;

[0067] 20-output shaft; 21-first limit member;

[0068] 30-first driving mechanism; 31-first magnetic body; 32-first driving cable;

[0069] 40 - second driving mechanism; 41 - second magnetic body; 411 - first magnetic part; 412 - second magnetic part; 42 - second driving cable;

[0070] 50-detection component; 51-magnetic component; 52-detection component; 53-circuit board; 531-through hole; 5311-avoidance gap; 532-tensile wire;

[0071] 60-reset member; 61-elastic portion; 62-installation portion; 63-clamping portion; 64-accommodating groove; 641-first area; 642-second area; 643-protrusion; 644-hollow area; 65-guide groove;

[0072] 70-winding bracket; 71-winding portion; 72-fixing portion; 73-winding groove;

[0073] 80-structural part; 81-steel ball; 82-inner ring;

[0074] 90-abutting member; 91-non-circular hole;

[0075] 100-Assembly Parts. DETAILED DESCRIPTION

[0076] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0077] An electric toothbrush includes a motor and a brush head. The brush head is connected to the output shaft of the motor. An electric toothbrush usually generates high-frequency vibrations in the brush head due to the high rotation speed of the output shaft after the output shaft rotates rapidly in the circumferential direction. When the brush head vibrates at a high frequency, it can instantly break down the toothpaste into fine foams and deeply clean the gaps between teeth. In addition, when the brush head vibrates at a high frequency, the vibration of the bristles can promote blood circulation in the oral cavity and have a massage effect on the gum tissue. Therefore, the output shaft of the existing electric toothbrush has a small rotation angle in the circumferential direction, which limits the vibration of the electric toothbrush, thereby limiting the cleaning power of the existing electric toothbrush.

[0078] With the continuous development of technology, people have higher requirements for the cleaning level of electric toothbrushes, which means that the cleaning power of electric toothbrushes needs to be improved.

[0079] In view of this, an embodiment of the present application provides an electric toothbrush, which can drive the output shaft to rotate relative to its own axis through the setting of the first driving mechanism in the motor, so that the brush head generates high-frequency vibrations to achieve the cleaning function of the electric toothbrush. On this basis, through the setting of the second driving mechanism in the motor, the output shaft can be driven to move back and forth along its own axis, so as to drive the brush head to make linear reciprocating motion in the axis of the output shaft. When the brush head reciprocates axially, it can reciprocate and clean a certain position of the teeth. Through the coordination of the rotation of the brush head along the output shaft and the linear reciprocating motion of the brush head, the cleaning power of the electric toothbrush can be improved.

[0080] The following is a further description of the structure of the motor in the electric toothbrush in combination with the accompanying drawings and embodiments.

[0081] Figure 1 A schematic structural diagram of a motor is shown. Figure 2 Shows Figure 1 Cross-sectional view of the motor in the AA direction.

[0082] See also Figure 1 and Figure 2As shown, the motor includes a housing 10, an output shaft 20 and a driving mechanism. The driving mechanism includes a first driving mechanism 30 and a second driving mechanism 40. The first driving mechanism 30, the second driving mechanism 40 and the output shaft 20 are all arranged in the housing 10. In addition, one end of the housing 10 is provided with an extension hole, and the end of the output shaft 20 is penetrated by the extension hole and connected to the brush head.

[0083] The housing 10 includes a housing body 11, a first end cap 12 and a second end cap 13. The housing body 11 can be understood as the structure of the housing 10 excluding the first end cap 12 and the second end cap 13. The first end cap 12 and the second end cap 13 are respectively arranged at both ends of the housing body 11, and form a receiving cavity with the housing body 11. The first drive mechanism 30, the second drive mechanism 40 and the output shaft 20 are all arranged in the receiving cavity. The first end cap 12 is arranged adjacent to the brush head, and a projection hole is provided on the first end cap 12.

[0084] In some embodiments, the first end cover 12 and the second end cover 13 can be detachably connected to the housing body 11 by at least one of a snap connection and a fastener connection, so as to facilitate the arrangement of some internal components in the motor in the accommodating cavity. The fastener can be a screw, a bolt, etc.

[0085] The first driving mechanism 30 and the second driving mechanism 40 are both connected to the output shaft 20. The first driving mechanism 30 is configured to drive the output shaft 20 to rotate relative to its own axis, so that when the first driving mechanism 30 drives the output shaft 20 to rotate rapidly around its own axis, the brush head can be driven to generate high-frequency vibrations to achieve the cleaning function of the electric toothbrush.

[0086] The second driving mechanism 40 is constructed to drive the output shaft 20 to reciprocate along its own axial direction, so that when the output shaft 20 is driven by the second driving mechanism 40 to reciprocate along its own axial direction, it can drive the brush head to make a linear reciprocating motion in the axial direction of the output shaft 20, so that the brush head can reciprocate and clean a certain position of the teeth.

[0087] Therefore, the embodiment of the present application provides the first drive mechanism 30 and the second drive mechanism 40, so that the brush head has two motion modes of high-frequency vibration and linear reciprocating motion under the drive of the output shaft 20. The coordination of these two motion modes of the brush head can enhance the cleaning power of the electric toothbrush.

[0088] See also Figure 2 As shown, the first driving mechanism 30 and the second driving mechanism 40 can be arranged in the housing 10 along the axial direction of the output shaft 20, and parts of the first driving mechanism 30 and the second driving mechanism 40 are arranged on the output shaft 20 to drive the output shaft 20 to rotate and perform linear reciprocating motion. For example, the first driving mechanism 30 can be located in the middle of the housing 10, and the second driving mechanism 40 can be located on the side of the first driving mechanism 30 away from the brush head.

[0089] See also Figure 2 As shown, the first driving mechanism 30 includes a first magnetic body 31. For example, the first magnetic body 31 can be a structure capable of generating a magnetic field, such as a magnet. The first magnetic body 31 is disposed on the circumferential side wall of the output shaft 20 and is located in the housing 10. For example, the first magnetic body 31 can be sleeved on the circumferential side wall of the output shaft 20 and fixed on the output shaft 20.

[0090] The first driving mechanism 30 also includes a driving cable. The driving cable is arranged on the side of the first magnetic body 31 facing the shell body 11 and is fixed in the shell 10. The driving cable generates a magnetic field when energized, and the generated magnetic field cooperates with the magnetic field generated by the first magnetic body 31 to generate a magnetic field force, which can drive the first magnetic body 31 to drive the output shaft 20 to rotate around its own axis.

[0091] It should be understood that, for the drive cable, when the direction of the current flowing through the drive cable changes when the drive cable is powered on, the direction of the magnetic field generated by the drive cable will also change. Therefore, by changing the direction of the current flowing through the drive cable when the drive cable is powered on, the rotation direction of the output shaft 20 can be changed, so that the output shaft 20 can rotate in two opposite directions (such as clockwise or counterclockwise), so that when the output shaft 20 rotates rapidly, it can drive the brush head to generate high-frequency vibration.

[0092] See also Figure 2 As shown, in some embodiments, the electric toothbrush further includes a wire winding bracket 70. The wire winding bracket 70 is disposed in the housing 10 and fixed to the housing 10. The wire winding bracket 70 includes a fixing portion 72 and a plurality of (including two) wire winding portions 71. The fixing portion 72 is fixedly disposed on the housing 10. The plurality of wire winding portions 71 are disposed on a side of the fixing portion 72 away from the housing 10, and a wire winding groove 73 is formed between the wire winding portion 71 and the fixing portion 72. The drive cable is wound around the wire winding portion 71 and is located in the wire winding groove 73, so that the drive cable is fixed in the housing 10 through the wire winding bracket 70.

[0093] The side of the plurality of winding portions 71 facing away from the fixed portion 72 also forms a through hole. The output shaft 20 can be penetrated in the through hole. The first magnetic body 31 is disposed between the output shaft 20 and the through hole. In some examples, when the plurality of winding portions 71 are disposed on the side of the fixed portion 72 facing away from the housing 10, the plurality of winding portions 71 can be evenly arranged in the circumferential direction of the output shaft 20, so that the distance between the winding portion 71 and the first magnetic body 31 in the radial direction of the output shaft 20 is more uniform, so as to ensure the stability of the magnetic field force and enhance the stability of the output shaft 20 when rotating around its own axis.

[0094] Figure 3 Shows Figure 2 Enlarged view of the motor at B.

[0095] See also Figure 3 As shown, the second driving mechanism 40 includes a second magnetic body 41. For example, the second magnetic body 41 can be a structure capable of generating a magnetic field, such as a magnet. The second magnetic body 41 is mounted on the circumferential side wall of the output shaft 20 and is located in the housing 10.

[0096] The second driving mechanism 40 also includes a driving cable, which is similar to the first driving mechanism 30. For ease of description, the driving cable in the first driving mechanism 30 is defined as a first driving cable 32, and the driving cable in the second driving mechanism 40 is defined as a second driving cable 42. The driving cable wound on the winding bracket 70 is the first driving cable 32.

[0097] The second drive cable 42 is located on the side of the second magnetic body 41 facing the housing 10 and is fixed in the housing 10. The second drive cable 42 generates a magnetic field, which can drive the second magnetic body 41 to drive the output shaft 20 to perform linear reciprocating motion along its axis.

[0098] See also Figure 3 As shown, the second magnetic body 41 includes a first magnetic part 411 and a second magnetic part 412 which are independent of each other. The first magnetic part 411 and the second magnetic part 412 are alternately arranged along the axial direction of the output shaft 20, and the magnetic fields generated by the first magnetic part 411 and the second magnetic part 412 are in opposite directions, so that the magnetic field generated by the second drive cable 42 can cooperate with the first magnetic part 411 and the second magnetic part 412, thereby driving the second magnetic body 41 to drive the output shaft 20 to move along its own axis toward the side close to the brush head, or driving the second magnetic body 41 to drive the output shaft 20 to move along its own axis toward the side away from the brush head, thereby realizing the output shaft 20 to make a linear reciprocating motion on its own axis.

[0099] Figure 3 FIG. 4 shows one first magnetic portion 411 and two second magnetic portions 412 , but the number of the first magnetic portion 411 and the second magnetic portion 412 is not limited.

[0100] The following further describes the linear reciprocating motion of the output shaft 20 by taking one first magnetic portion 411 and two second magnetic portions 412 as an example.

[0101] See also Figure 3 As shown, for the convenience of description, one of the two second magnetic parts 412 closer to the brush head is defined as the second magnetic part 412a, and the other farther from the brush head is defined as the second magnetic part 412b.

[0102] Assuming that the magnetic fields generated by the second drive cable 42 and the magnetic fields generated by the second magnetic part 412 are both N, since the magnetic fields generated by the first magnetic part 411 and the second magnetic part 412 are in opposite directions, the magnetic field generated by the first magnetic part 411 is S. When the magnetic field generated by the second drive cable 42 covers the area between the second magnetic part 412a and the first magnetic part 411, since like charges attract and opposite charges repel, the magnetic field generated by the second drive cable 42 will generate a repulsive force on the second magnetic part 412a and an attractive force on the first magnetic part 411, so that the second magnetic body 41 can drive the output shaft 20 to move along its own axis toward the side close to the brush head.

[0103] After the second magnetic body 41 and the output shaft 20 move, the magnetic field generated by the second drive cable 42 covers the space between the first magnetic part 411 and the second magnetic part 412b. The magnetic field generated by the second drive cable 42 generates a repulsive force on the second magnetic part 412b and an attractive force on the first magnetic part 411, so that the second magnetic body 41 can drive the output shaft 20 to move along its own axis toward the side away from the brush head. Therefore, through the cooperation of the second drive cable 42 with the first magnetic part 411 and the second magnetic part 412, the output shaft 20 can be driven to perform linear reciprocating motion on its own axis.

[0104] The swing angle of the output shaft of existing electric toothbrushes in the circumferential direction is small (mostly between 3° and 10°), which limits the vibration range of the brush head, thereby affecting the cleaning power of the electric toothbrush. The swing angle of the output shaft in the circumferential direction refers to the maximum rotation angle that the output shaft can reach when rotating in two opposite directions in the circumferential direction.

[0105] Therefore, in the related art, in order to improve the cleaning power of the electric toothbrush, the swing angle of the output shaft in the circumferential direction needs to be increased. As the swing angle of the output shaft in the circumferential direction increases, the positioning of the rotation angle of the output shaft in the circumferential direction has higher requirements.

[0106] However, the existing electric toothbrush cannot accurately position the rotation angle of the output shaft in the circumferential direction.

[0107] Figure 4 A schematic diagram of assembling the output shaft 20, the circuit board 53 and the reset member 60 is shown.

[0108] See also Figure 3 and Figure 4As shown, in some embodiments, the electric toothbrush also includes a detection component 50. The detection component 50 includes a magnetic component 51. Among them, the magnetic component 51 is sleeved on the circumferential side wall of the output shaft 20 and rotates synchronously with the output shaft 20. For example, the magnetic component 51 can be an annular magnet. A step surface can be provided on the circumferential side wall of the output shaft 20. The magnetic component 51 can be sleeved on the circumferential side wall of the output shaft 20 and arranged on the step surface so that the magnetic component 51 is arranged on the circumferential side wall of the output shaft 20. At the same time, the magnetic component 51 can also be connected to the circumferential side wall of the output shaft 20 by bonding, clamping, etc., so as to realize the synchronous rotation of the annular magnet and the output shaft 20.

[0109] It should be noted that the "synchronous rotation of A and B" mentioned in the embodiments of the present application means that A and B rotate at the same angle in the same direction at the same time. For example, the synchronous rotation of the magnetic member 51 and the output shaft 20 can be understood as the synchronous rotation of the magnetic member 51 and the output shaft 20 in the same direction at the same angle. If there are similar expressions below, they can be understood in this way.

[0110] See also Figure 3 and Figure 4 As shown, the detection assembly 50 further includes a detection member 52 and a circuit board 53. The detection member 52 can confirm the rotation angle of the output shaft 20 by detecting the rotation angle of the magnetic member 51.

[0111] The detection member 52 is disposed on the circuit board 53. The circuit board 53 is provided with a through hole 531, and the output shaft 20 passes through the through hole 531 to avoid interference between the output shaft 20 and the circuit board 53. At the same time, the circuit board 53 can accurately detect the rotation angle of the output shaft 20 in the circumferential direction according to the rotation angle of the output shaft 20 confirmed by the detection member 52.

[0112] Compared with the traditional physical structure to limit the angle of the output shaft, the circuit board 53 is more accurate through circuit control, and further reverse control of the output shaft 20 is more timely. This will make the movement of the output shaft 20 more stable, which is conducive to the electric toothbrush to accurately deep clean the teeth and is convenient for users to use.

[0113] It should be noted that, since the magnetic member 51 is disposed on the output shaft 20 and rotates synchronously with the output shaft 20 , when the output shaft 20 rotates around its own axis, the magnetic member 51 is also driven to rotate synchronously.

[0114] When the magnetic member 51 rotates, the detection member 52 can identify different positions of the magnetic member 51 , thereby confirming the rotation angle of the output shaft 20 .

[0115] See also Figure 3 and Figure 4As shown, in some embodiments, the electric toothbrush further includes a reset member 60. The reset member 60 is disposed in the housing 10. The side of the reset member 60 close to the housing 10 is fixed relative to the housing 10 to achieve the installation of the reset member 60 in the housing 10.

[0116] The circuit board 53 is fixedly arranged on the reset member 60, so that the detection member 52 is arranged on the reset member 60 through the circuit board 53 and is located in the housing 10. The reset member 60 can be arranged between the first drive mechanism 30 and the second drive mechanism 40, so that the circuit board 53 can be located between the first drive mechanism 30 and the second drive mechanism 40 when it is fixedly arranged in the reset member 60, so as to facilitate the electrical connection between the circuit board 53 and the first drive cable 32, and the arrangement of related cables.

[0117] See also Figure 4 As shown, the first driving mechanism 30 includes a driving cable (first driving cable 32). A tensile wire 532 is provided inside the motor. The tensile wire 532 and the driving cable of the first driving mechanism 30 are electrically connected to the circuit board 53 through the tensile wire 532, so that the circuit board 53 can drive the output shaft 20 to rotate through the first driving mechanism 30.

[0118] The circuit board 53 and the reset member 60 can also reciprocate with the output shaft 20 to ensure that the output shaft 20 can perform linear reciprocating motion. At the same time, the distance between the detection member 52 and the magnetic member 51 in the axial direction of the output shaft 20 can always be kept consistent, so as to avoid the detection member 52 affecting the detection of the rotation angle of the magnetic member 51 when the distance between the detection member 52 and the magnetic member 51 in the axial direction of the output shaft 20 changes, thereby ensuring the detection accuracy and detection stability of the detection member 52 detecting the rotation angle of the magnetic member 51. In this way, the accurate positioning of the rotation angle of the output shaft 20 in the circumferential direction by the circuit board 53 can be achieved, so as to achieve precise control of the rotation of the output shaft 20.

[0119] Figure 5 Shows Figure 4 Exploded view of the assembly, Figure 6 This is a partial schematic diagram of the motor at the end away from the brush head. Figure 6 This is a cross-sectional view of the motor at the end away from the brush head, forming Figure 6 The cross section can be seen in Figure 4 The CC section in. Figure 7 for Figure 4 A schematic diagram of the structure of the middle reset member 60, Figure 8 for Figure 4 Enlarged view at D.

[0120] Combine the following Figures 4 to 8 , the structure of the reset member 60 and the fixation of the circuit board 53 on the reset member 60 are further explained.

[0121] See also Figures 4 to 7 As shown, the reset member 60 includes an elastic portion 61. The elastic portion 61 is disposed on the circumferential side wall of the output shaft 20 and is relatively fixed to the output shaft 20. The elastic portion 61 can move synchronously with the output shaft 20 when the output shaft 20 moves in the axial direction, so that part of the reset member 60 can reciprocate with the output shaft 20. The circuit board 53 can be fixed to the elastic portion 61, so that when the elastic portion 61 can reciprocate with the output shaft 20, the circuit board 53 can be driven to move synchronously.

[0122] The reset member 60 further includes a mounting portion 62. The mounting portion 62 is connected to a side of the elastic portion 61 away from the output shaft 20, and the mounting portion 62 may form a side of the reset member 60 close to the housing 10. The mounting portion 62 is connected to the housing 10 to achieve that the side of the reset member 60 close to the housing 10 is fixed relative to the housing 10. For example, the mounting portion 62 may be fixed to the inner wall of the housing 10 by means of snap connection, bonding, fasteners, etc.

[0123] The elastic portion 61 can be understood as the inner ring structure of the reset member 60, and the mounting portion 62 can be understood as the outer ring structure of the reset member 60. The elastic portion 61 and the mounting portion 62 surround a receiving groove 64. The notch of the receiving groove 64 faces the magnetic member 51. The circuit board 53 can be arranged in the receiving groove 64 through the notch, so that the detection member 52 can be opposite to the magnetic member 51 when it is arranged on the circuit board 53, so that the detection member 52 can better detect the rotation angle of the magnetic member 51.

[0124] like Figures 4 to 7 As shown, the reset member 60 includes a clamping portion 63. The clamping portion 63 extends along the axial direction of the output shaft 20. The clamping portion 63 passes through a through hole 531. In addition, a portion of the clamping portion 63 passes through the through hole 531 to clamp one side of the circuit board 53, and the clamping portion 63 and the circuit board 53 are clearance-matched. In other words, when the clamping portion 63 passes through the through hole 531, a portion of the clamping portion 63 is located below the circuit board 53, and another portion of the clamping portion 63 passes through the through hole 531 to clamp above the circuit board 53.

[0125] It should be noted that the bottom and top of the circuit board 53 mentioned in the embodiment of the present application are both Figures 4 to 8 It should be understood that the bottom of the circuit board 53 can be understood as the side of the circuit board 53 facing the brush head, and correspondingly, the top of the circuit board 53 can be understood as the side of the circuit board 53 facing the magnetic member 51.

[0126] In order to enable the clamping portion 63 to clamp one side of the circuit board 53, when the circuit board 53 is arranged in the accommodating groove 64, the elastic portion 61 also needs to be supported on the bottom of the circuit board 53, so that when part of the clamping portion 63 passes through the through hole 531, it can clamp one side of the circuit board 53.

[0127] By the clamping of the clamping portion 63 and the circuit board 53, the circuit board 53 can be limited in the axial direction of the output shaft 20, so that the circuit board 53 is fixed to the reset member 60 and will not move relative to the circuit board 53 along the axial direction of the output shaft 20. In this way, the distance between the detection member 52 and the magnetic member 51 in the axial direction of the output shaft 20 can always be kept consistent, so as to ensure the detection accuracy and detection stability of the rotation angle detection of the magnetic member 51 by the detection member 52, and further ensure the accurate control of the rotation of the output shaft 20 by the circuit board 53.

[0128] In addition, the clamping portion 63 partially passes over the through hole 531 to clamp one side of the circuit board 53, so that when the circuit board 53 moves along the axial direction with the output shaft 20, the clamping portion 63 can hook the circuit board 53 to ensure that the circuit board 53 is stable relative to the reset member 60, which is further beneficial to accurately detect the rotation angle of the output shaft 20.

[0129] If the clamping portion 63 and the circuit board 53 are in interference fit (tight fit), the circuit board 53 will be continuously stressed, and long-term use may easily cause the circuit board 53 to deform. This will cause the detection accuracy and stability of the detection member 52 to decrease during long-term use of the electric toothbrush, shorten the service life of the motor, and generate abnormal noise during use, affecting the user experience.

[0130] In contrast, in the embodiment of the present application, the clearance fit between the clamping portion 63 and the circuit board 53 can avoid the problem of deformation of the circuit board 53 due to interference fit, thereby ensuring that the detection accuracy and stability of the detection member 52 will not be reduced due to deformation of the circuit board 53.

[0131] See also Figure 8 As shown, in some embodiments, the through hole 531 includes an avoidance hole and an avoidance notch 5311. The avoidance hole is used to avoid the output shaft 20, and the output shaft 20 is arranged in the avoidance hole. The wall forming the avoidance hole is concave toward the housing 10 side to form the avoidance notch 5311. The position of the clamping portion 63 corresponds to the position of the avoidance notch 5311, so that the clamping portion 63 is clamped to one side of the circuit board 53. In other words, the clamping portion 63 is arranged in the avoidance notch 5311 and is clamped to one side of the circuit board 53.

[0132] By avoiding the cooperation between the wall of the notch 5311 and the clamping portion 63, the circuit board 53 can be limited in the circumferential direction of the output shaft 20, so as to reduce or even avoid the positional displacement of the circuit board 53 in the circumferential direction of the output shaft 20 when the output shaft 20 makes a linear reciprocating movement, thereby affecting the detection accuracy and stability of the detection member 52.

[0133] See also Figure 8As shown, in some embodiments, along the circumference of the output shaft 20, the gap b between the clamping portion 63 and the wall forming the avoidance gap 5311 can be greater than 0 mm and less than or equal to 0.3 mm. For example, the gap b can be 0.1 mm, 0.2 mm, 0.3 mm, etc. The wall forming the avoidance gap 5311 can include two oppositely arranged side walls and a connecting wall, and the connecting wall is located between the two side walls and connected to the two side walls. Along the circumference of the output shaft 20, the gap between the clamping portion 63 and the wall forming the avoidance gap 5311 can be understood as the gap between the clamping portion 63 and one of the side walls, which can be represented by the gap b.

[0134] If the reset member 60 and the circuit board 53 are directly fixed by bonding (such as glue), although the reset member 60 and the circuit board 53 can be integrated, after the motor has run for a period of time, the bonding position of the reset member 60 and the circuit board 53 is easy to loosen. At this time, the detection accuracy and stability of the detection member 52 will be reduced.

[0135] In contrast, in the embodiment of the present application, although the clamping portion 63 and the circuit board 53 are clearance-fitted, the clearance b is limited by the value of the clearance b, so that the clearance b can be controlled within the smallest possible range, so that when the output shaft 20 is making a linear reciprocating movement, the possible position deviation of the circuit board 53 in the circumferential direction of the output shaft 20 is controlled within the smallest possible range, so that through the clearance fit between the clamping portion 63 and the circuit board 53, absolute physical fixation is achieved, so as to ensure that when the output shaft 20 is making a linear reciprocating movement, the positions of the detection member 52 and the magnetic member 51 in the axial direction of the output shaft 20 are relatively stable, which can further improve the detection accuracy and stability of the detection member 52.

[0136] Taking the gap b of 0.1mm as an example, when the gap b is 0.1mm, when the output shaft 20 is making a linear reciprocating motion, the circuit board 53 will not have a position deviation greater than 0.2mm in the circumferential direction of the output shaft 20, and absolute physical fixation can be achieved, ensuring that when the output shaft 20 is making a linear reciprocating motion, the positions of the detection component 52 and the magnetic component 51 in the axial direction of the output shaft 20 are relatively stable.

[0137] See also Figure 8As shown, in some embodiments, in the radial direction of the output shaft 20, the gap between the clamping portion 63 and the wall forming the avoidance gap 5311 is less than or equal to 0.1mm. In the radial direction of the output shaft 20, the gap between the clamping portion 63 and the wall forming the avoidance gap 5311 can be understood as the gap between the clamping portion 63 and the connecting wall. For example, the gap can be 0.08mm, 0.06mm, 0.05mm, etc. With such a configuration, when the output shaft 20 is moving back and forth in a straight line, the circuit board 53 will not have a positional deviation greater than 0.2mm in the radial direction of the output shaft 20, and absolute physical fixation can be achieved, which can ensure that when the output shaft 20 is moving back and forth in a straight line, the positions of the detection member 52 and the magnetic member 51 in the axial direction of the output shaft 20 are relatively stable.

[0138] When the gap between the clamping portion 63 and the wall forming the avoidance gap 5311 in the circumferential and radial directions of the output shaft 20 is within the above-mentioned range, after multiple tests and verifications, the detection accuracy of the detection component 52 can be improved by 50%, the control accuracy of the circuit board 53 on the output shaft 20 can be improved by nearly 100%, and the service life of the motor is increased by 50%.

[0139] When the clamping portion 63 clamps one side of the circuit board 53, in some embodiments, the circuit board 53 and the reset member 60 can also be bonded and fixed relative to the deformed portion of the housing 10. In other words, the circuit board 53 can also be bonded and fixed to the elastic portion 61. For example, after the circuit board 53 is clamped to the reset member 60, it can be bonded and fixed to the elastic portion 61 by dispensing glue or the like.

[0140] By partially bonding and fixing the circuit board 53 and the reset member 60, the stability of the connection between the circuit board 53 and the reset member 60 can be enhanced while not affecting the reciprocating movement of the circuit board 53 and the reset member 60 with the output shaft 20, so as to further ensure that when the output shaft 20 moves linearly back and forth, the positions of the detection member 52 and the magnetic member 51 in the axial direction of the output shaft 20 are relatively stable.

[0141] See also Figure 7 As shown, the bottom wall of the receiving groove 64 is formed by the elastic portion 61 and the mounting portion 62. The portion of the bottom wall formed by the elastic portion 61 is defined as a first area 641, and the portion formed by the mounting portion 62 is defined as a second area 642.

[0142] In some embodiments, along the projection direction of the magnetic member 51 on the circuit board 53, at least a portion of the first area 641 is higher than the second area 642, so that when the circuit board 53 is disposed in the receiving groove 64, the elastic portion 61 can be supported on the bottom of the circuit board 53. At the same time, since the lower portion of the bottom wall of the receiving groove 64 is not in contact with the circuit board 53, the bottom wall of the receiving groove 64 can provide some non-contact space for the circuit board 53 to facilitate heat dissipation of the circuit board 53.

[0143] In some embodiments, a plurality of protrusions 643 protruding toward one side of the slot opening may be provided on the bottom wall of the receiving slot 64. The protrusions 643 may be provided in the second area 642.

[0144] In some embodiments, the bottom wall of the accommodating groove 64 may have a hollow area 644, and the hollow area 644 runs through the bottom wall of the accommodating groove 64 on both sides of the axial direction of the output shaft 20. In other words, the positions where the through holes 531 are opened on the bottom wall of the accommodating groove 64 can be understood as the hollow area 644. The provision of the hollow area 644 can facilitate further heat dissipation of the circuit board 53.

[0145] In some embodiments, a buffer may be provided in the receiving groove 64. The buffer is provided at least between the bottom wall of the receiving groove 64 and the circuit board 53, so that the circuit board 53 contacts the bottom wall of the receiving groove 64 through the buffer, thereby avoiding direct contact (hard contact) between the circuit board 53 and the bottom wall of the receiving groove 64, and reducing the deformation of the circuit board 53. This can further ensure that the detection accuracy and stability of the detection member 52 will not be reduced due to the deformation of the circuit board 53.

[0146] See also Figure 8 As shown, as described above, the motor has a tensile wire 532, and the driving cable in the first driving mechanism 30 is electrically connected to the circuit board 53 through the tensile wire 532. For example, the tensile wire 532 can be welded to the circuit board 53 to achieve electrical connection between the tensile wire 532 and the circuit board 53. On this basis, the tensile wire 532 can also be bonded to the circuit board 53 to better fix the tensile wire 532 to the circuit board 53.

[0147] In some embodiments, the wire diameter of the tensile wire 532 may be 1.2 to 3 times the wire diameter of the drive cable (first drive cable 32) in the first drive mechanism 30. For example, the wire diameter of the tensile wire 532 may be 1.5, 2, or 2.5 times the wire diameter of the first drive cable 32.

[0148] When the output shaft 20 rotates or moves axially, it will pull the tension wire 532. In particular, when moving axially, the instantaneous rapid movement of the output shaft 20 will pull the tension wire 532. When the wire diameter of the tension wire 532 is 1.2 to 3 times the wire diameter of the first drive cable 32, the connection strength and stability of the electrical connection between the circuit board 53 and the first drive mechanism 30 can be enhanced, so as to further improve the service life and signal stability of the motor.

[0149] In some embodiments, the length L of the tensile wire 532 needs to satisfy the following conditions:

[0150]

[0151] In the formula, D is the maximum displacement of the output shaft 20 in the axial direction, a is a coefficient, and the coefficient is greater than or equal to 2 and less than or equal to 10.

[0152] By limiting the length L of the tensile wire 532, it can be ensured that the length of the tensile wire 532 is at least equal to the shortest length required by the tensile wire 532 when the output shaft 20 moves axially to the maximum displacement, so as to ensure that when the circuit board 53 is electrically connected to the first drive cable 32 through the tensile wire 532, it will not affect the axial movement of the output shaft 20.

[0153] The tensile wire 532 will bend during the axial movement of the output shaft 20. If the coefficient a is less than 2, the length of the tensile wire 532 is too short to support the output shaft 20 to move to the maximum displacement in the axial direction. If the coefficient a is greater than 10, the length of the tensile wire 532 is too long, and the space inside the motor is limited to accommodate the overly long tensile wire 532.

[0154] In addition, the motor frequency determines the resonance point of the motor's axial motion, and also affects the axial displacement stroke of the electric toothbrush, further affecting the selection of coefficient a.

[0155] For example, when the frequency of the motor is 210 Hz, the coefficient a may be greater than or equal to 2 and less than or equal to 10. Exemplarily, the coefficient a may be 2, 3, 4, 5, 7, 9, 10, and the like.

[0156] In contrast, in the present application, when the frequency of the motor is 210 Hz, the coefficient a is limited to be greater than or equal to 2 and less than or equal to 10. While ensuring that the output shaft 20 can smoothly move to the maximum displacement in the axial direction, the tensile wire 532 will not produce excessive redundant length. When the space inside the motor is limited, the tensile wire 532 can be installed in the motor to ensure that the circuit board 53 is electrically connected to the first drive cable 32 through the tensile wire 532.

[0157] See also Figure 4 As shown, in some embodiments, a guide groove 65 is provided on the circumferential outer side of the reset member 60. The guide groove 65 allows the tensile wire 532 to be passed through so that the tensile wire 532 is electrically connected to the drive cable (first drive cable 32). In this way, while the circuit board 53 is electrically connected to the first drive cable 32 through the tensile wire 532, the tensile wire 532 can be guided through the guide groove 65, so that when the output shaft 20 moves in the axial direction, the tensile wire 532 can move in the guide groove 65, thereby improving the stability of the electrical connection between the circuit board 53 and the first drive cable 32. At the same time, by setting the guide groove 65, the friction of other parts in the motor on the tensile wire 532 can also be reduced, further protecting the tensile wire 532 and extending the service life of the electric toothbrush.

[0158] The electric toothbrush may further include a protective cover, which is disposed in the guide groove 65. Part of the tensile wire 532 is inserted into the protective cover. When the output shaft 20 reciprocates, the tensile wire 532 can move relative to the protective cover to reduce wear and deformation caused by direct contact between the tensile wire 532 and the reset member 60 or other structures in the housing 10, thereby improving the service life and stability of the tensile wire 532.

[0159] In this embodiment, there are two reset members 60. The two reset members 60 are respectively located at opposite ends of the output shaft 20, so that when the output shaft 20 reciprocates along the axial direction, the two reset members 60 can assist the output shaft 20 in resetting to a state where the output shaft 20 does not move axially. A circuit board 53 is provided on one of the reset members 60. It can be understood that in other embodiments, in order to ensure accurate positioning, the number of the detection components 50 can also be two, and the two circuit boards 53 are respectively provided on the two reset members 60; or the number of the reset member 60 is one, and one circuit board 53 is correspondingly provided on one reset member 6.

[0160] Fig. 9 A schematic structural diagram of a winding bracket 70 is shown.

[0161] See also Figure 2 and Fig. 9 As shown, the winding bracket 70 includes a plurality of winding parts 71, and the winding parts 71 and the fixing parts 72 respectively form a winding groove 73, so that the drive cable (first drive cable 32) can be wound in the winding groove 73. The winding part 71 extends along the circumferential direction of the output shaft 20. The length of the plurality of winding parts 71 along the circumferential direction of the output shaft 20 accounts for at least 55% of the circumference of the circle where the winding part is located. In this way, it can be ensured that a single winding part 71 has a large length in the extension direction, and the winding bracket 70 can be structurally adjusted to enhance the strength and deformation resistance of the winding part 71, and ensure the winding uniformity and service life of the drive cable in the winding bracket 70. In particular, there will be a pre-tightening force when the drive cable is wound around the winding part 71, and the pre-tightening force will act on the winding part 71 for a long time. By changing the structure of the winding bracket 70, the collapse of the winding part 71 after long-term use can be prevented, which is conducive to improving the service life of the electric toothbrush.

[0162] In some embodiments, the winding bracket 70 may be made of a plastic having a certain hardness. For example, the plastic used to make the winding bracket 70 may be a mixed material of polyhexamethylene adipamide (PA66, commonly known as nylon-66) and glass fiber (GF). The mixing ratio of the glass fiber is not less than 30%. For example, the mixing ratio of the glass fiber may be 40%. By limiting the material of the winding bracket 70, the strength and deformation resistance of the winding bracket 70 can also be enhanced, thereby ensuring the winding uniformity and service life of the drive cable in the winding bracket 70.

[0163] The number of the winding brackets 70 can be two. The winding brackets 70 are clamped with the reset member 60 to assist the relative fixation of the reset member 60. The winding grooves 73 of the two winding brackets 70 correspond one to one in the axial direction of the output shaft 20. The corresponding two winding grooves 73 in the two winding brackets 70 form a winding channel, and the first drive cable 32 is wound in the corresponding winding channel.

[0164] Fig.10 A schematic diagram of the interior of the motor is shown near the end of the brush head.

[0165] See also Fig.10 As shown, the part of the output shaft 20 located in the housing 10 is provided with a structural member 80. Due to the existence of the structural member 80, the output shaft 20 will resonate with the structural member 80 when vibrating at a high frequency, resulting in a large noise, which affects the user experience.

[0166] For this purpose, see Fig.10 As shown, in some embodiments, the electric toothbrush may further include a resisting member 90, which is disposed on the housing 10. Moreover, at least a portion of the resisting member 90 can resist the output shaft 20 to reduce vibration or resonance between the output shaft 20 and the structural member 80.

[0167] The output shaft 20 has an axial movement mode, and most of the components (including structural components) disposed on the output shaft 20 need to move axially with the output shaft 20 and cannot be fixed relative to the housing 10. In this way, during the high-frequency movement of the motor, vibration or resonance may occur between the output shaft 20 and some components.

[0168] In contrast, in the embodiment of the present application, the output shaft 20 is supported by the supporting member 90, so that the output shaft 20 and the structural member 80 thereon can be relatively more compact or closer, thereby reducing the vibration or resonance between the output shaft 20 and the structural member 80, further reducing noise, and improving the user experience.

[0169] Since at least part of the abutting member 90 can abut the output shaft 20, the abutting member 90 can provide an abutting force for the output shaft 20. The abutting force can be regarded as a pre-compression force applied to the output shaft 20. Under the action of the abutting force, the output shaft 20 and the structural member 80 are more closely attached, so that the output shaft 20 is less likely to resonate with the structural member 80 during high-frequency vibration, which can reduce noise and improve user experience.

[0170] The holding force may be greater than or equal to 15 N and less than or equal to 20 N, so that the holding member 90 can provide sufficient force for the output shaft 20 to ensure that the output shaft 20 is more closely attached to the structural member 80 under the action of the holding force.

[0171] See also Fig.10As shown, as a possible implementation, at least part of the abutment 90 is arranged on the wall forming the extension hole, and the abutment 90 abuts against part of the output shaft 20 in the circumferential direction around the output shaft 20, so that the abutment 90 can provide a abutment force for the output shaft 20 in the radial direction of the output shaft 20. The arrangement of the abutment 90 on the wall forming the extension hole can reduce the occupied volume of the abutment 90, which is further conducive to reducing the volume of the electric toothbrush. In addition, this abutment force can make the output shaft 20 and the structural member 80 more closely attached, so that the integrity of the output shaft 20 and the structural member 80 is better, which can reduce the possibility of resonance between the output shaft 20 and the structural member 80 during high-frequency vibration, thereby reducing noise and improving user experience.

[0172] Fig.11 A partial schematic diagram of a motor near one end of the brush head is shown. Fig.12 A schematic structural diagram of a supporting member 90 is shown.

[0173] See also Fig.11 and Fig.12 The output shaft 20 is provided with the abutment 90, and a portion of the abutment 90 is interference fit with the output shaft 20, so that the abutment 90 abuts against a portion of the output shaft 20 in the circumferential direction of the output shaft 20, so that the abutment 90 can provide a abutment force for the output shaft 20 in the radial direction of the output shaft 20.

[0174] In this way, the annular support member 90 is conveniently fixedly mounted relative to the wall of the extension hole, which further helps to improve the assembly production efficiency of the electric toothbrush. In addition, by making the support member 90 interfere with the output shaft 20, the structural setting is simplified, and the noise is reduced through the sophisticated structure, which helps to optimize the structural design of the electric toothbrush and further helps to obtain an electric toothbrush with a relatively small volume.

[0175] The circumferential side wall of the abutting member 90 on one side facing the output shaft 20 forms a non-circular hole 91. Part of the hole wall of the non-circular hole 91 protrudes 643 toward one side of the output shaft 20 and forms a protruding area, so that when the output shaft 20 is inserted into the non-circular hole 91, part of the abutting member 90 and the output shaft 20 are interference-fitted.

[0176] The number of raised areas may be one or at least two. When the number of raised areas is at least two, at least two raised areas are spaced apart on one side of the output shaft 20 in the circumferential direction, so that at least two parts of the abutment 90 are interference-fitted with the output shaft 20, and the abutment force of the abutment 90 on the output shaft 20 can be prevented from being offset, thereby affecting the abutment effect of the abutment 90 on the output shaft 20 and the structural member 80.

[0177] The interference fit portion between the abutment 90 and the output shaft 20 accounts for at least one sixth of the circumferential side wall of the abutment 90 and is less than one half of the circumferential side wall of the abutment 90. The interference fit portion between the abutment 90 and the output shaft 20 can be understood as the convex area mentioned above.

[0178] The resisting force is related to the area where the resisting member 90 and the output shaft 20 are interference-fitted.

[0179] If the entire circumferential side wall of the supporting member 90 is in interference fit with the output shaft 20 , no supporting force may be generated.

[0180] If the portion of the abutment member 90 that is in interference fit with the output shaft 20 is smaller than one sixth of the circumferential side wall, the abutment force generated may not be sufficient to make the output shaft 20 fit tightly against the structural member 80 .

[0181] In contrast, in the embodiment of the present application, by limiting the proportion of the portion of the interference fit between the supporting member 90 and the output shaft 20 to the circumferential side wall of the supporting member 90, the area of ​​the interference fit between the supporting member 90 and the output shaft 20 can be limited to a more appropriate range, thereby ensuring that the supporting member 90 and the output shaft 20 have a sufficient area for interference fit, so that the supporting force generated by the supporting member 90 makes the output shaft 20 fit tightly against the structural member 80.

[0182] See also Fig.10 As shown, the interference thickness d between the abutting member 90 and the output shaft 20 may be greater than or equal to 0.2 mm and less than or equal to 0.8 mm.

[0183] The abutting force is also related to the interference thickness d between the abutting member 90 and the output shaft 20 .

[0184] If the interference thickness d between the supporting member 90 and the output shaft 20 is less than 0.2 mm, the supporting force may be too small, and the output shaft 20 and the structural member 80 are less closely attached.

[0185] If the interference thickness d between the supporting member 90 and the output shaft 20 is greater than 0.8 mm, the supporting force may be too large, which may affect the axial movement of the output shaft 20 .

[0186] In contrast, in the embodiment of the present application, when the interference thickness d between the supporting member 90 and the output shaft 20 is within the above-mentioned range, the interference thickness d between the supporting member 90 and the output shaft 20 and the supporting force can be controlled within a more appropriate range, so that the supporting force generated by the supporting member 90 can make the output shaft 20 and the structural member 80 fit tightly.

[0187] The hardness of the interference fit portion between the abutting member 90 and the output shaft 20 may be greater than or equal to 40 Shore degrees and less than or equal to 70 Shore degrees.

[0188] The resisting force is also related to the hardness of the interference fit between the resisting member 90 and the output shaft 20 .

[0189] If the hardness of the interference fit between the supporting member 90 and the output shaft 20 is less than 40 Shore degrees, the deformation of the matching part between the supporting member 90 and the output shaft 20 is small, and the supporting force may be too small, which will still result in a low degree of fit between the output shaft 20 and the structural member 80.

[0190] If the hardness of the interference fit portion between the supporting member 90 and the output shaft 20 is greater than 70 Shore degrees, the deformation of the matching portion between the supporting member 90 and the output shaft 20 is large, the supporting force may be too large, and the axial movement of the output shaft 20 may be affected.

[0191] On the other hand, in the embodiment of the present application, when the hardness of the interference fit portion between the abutting member 90 and the output shaft 20 is within the above range, the hardness of the interference fit portion between the abutting member 90 and the output shaft 20 and the abutting force can be controlled within a more appropriate range, so that the abutting force generated by the abutting member 90 can make the output shaft 20 and the structural member 80 close to each other. In addition, when the hardness of the interference fit portion between the abutting member 90 and the output shaft 20 is adjusted, it is possible to prevent the abutting member 90 from being too small in hardness to provide a stable abutting force, and also to prevent the abutting member 90 from being too large in hardness to damage the output shaft 20.

[0192] See also Fig.10 As shown, the structural member 80 may be a bearing or other structure disposed on the output shaft 20 in the housing 10 .

[0193] When the structural member 80 is a bearing, the bearing can be sleeved on the circumferential side wall of the output shaft 20, so that the bearing is arranged on the output shaft 20. Since the bearing cannot be fixed relative to the housing 10 when the output shaft 20 moves along its own axial direction, the bearing also moves with the output shaft 20. Since there is a radial gap in the bearing, and the bearing is provided with a steel ball 81 in the radial gap, when the bearing moves with the output shaft 20, the steel ball 81 is very likely to move and resonate with the output shaft 20.

[0194] In contrast, in the embodiment of the present application, the output shaft 20 is supported by the support member 90, so that there is a preload between the output shaft 20 and the inner ring 82 of the bearing. Furthermore, the preload will make the inner ring of the bearing, the steel ball inside the bearing, and the outer ring of the bearing relatively close in a certain area, so that the steel ball 81 can be relatively fixed. In this way, when the bearing moves with the output shaft 20, the steel ball 81 is not easy to move, which can reduce the possibility of resonance between the output shaft 20 and the bearing during high-frequency vibration, thereby reducing noise and improving the comfort of using the electric toothbrush.

[0195] Fig.13 Another schematic diagram of the interior of the motor near the brush head is shown.

[0196] See also Fig.13 As shown, as another possible implementation, when the abutting member 90 is disposed in the housing 10, the abutting member 90 can be disposed between the first end cover 12 of the housing 10 and the structural member 80. In addition, one end of the abutting member 90 is connected to the first end cover 12, and the other end of the abutting member 90 is connected to the structural member 80. The abutting member 90 is a deformable elastic structure and abuts against the structural member 80. For example, the abutting member 90 can be a spring or the like. In this way, when the output shaft 20 moves axially, the abutting member 90 can absorb the vibration of the structural member 80 to reduce the vibration or resonance between the output shaft 20 and the structural member 80, thereby reducing noise and improving user experience.

[0197] For electric toothbrushes, the output shaft of existing motors can be rotated freely when the motor stops working, so when the motor stops working, power is still needed so that part of the power is used to reset the output shaft. Due to the use of this part of power, the battery life of the electric toothbrush may be reduced.

[0198] Fig.14 A schematic diagram of the interior of yet another motor is shown near one end of the brush head.

[0199] See also Fig.14 As shown, in some embodiments, a first limiter 21 is provided on the output shaft 20, and the housing 10 includes a second limiter 14. When the output shaft 20 swings (rotates) in the circumferential direction, the first limiter 21 and the second limiter 14 can make the output shaft 20 swing back and forth within the range of 0° to 180°. In other words, regardless of whether the motor is started or stopped, under the action of the first limiter 21 and the second limiter 14, the swing angle of the output shaft 20 will be limited to within 180°. Taking the swing angle of 180° as an example, the output shaft 20 rotates 90 degrees clockwise at the zero point of rotation, and rotates 90 degrees counterclockwise at the zero point of rotation, so that the output shaft 20 can swing back and forth within the range of 180°.

[0200] Compared with the output shaft 20 freely rotating within the range of 360°, when the swing angle of the output shaft 20 is limited within 180°, the output shaft 20 cannot freely rotate within the range of 360°. This effectively reduces the difficulty of the algorithm control of the motor on the rotation of the output shaft 20, improves the control accuracy, reduces the power required when the output shaft 20 is reset to the zero point of rotation, and effectively increases the battery life of the product.

[0201] It should be noted that the rotation zero point of the output shaft 20 refers to the position of the output shaft when the electric toothbrush is not in use.

[0202] In addition, since the output shaft 20 cannot rotate freely within a range of 360°, in some embodiments, a pressure sensor may be further provided on the output shaft 20. The pressure sensor is used to detect the brushing force so that when the user uses the electric toothbrush, the electric toothbrush can detect the user's brushing force, so that when it detects that the brushing force is too strong, the electric toothbrush can remind the user, so that the electric toothbrush has an over-voltage protection function, which can improve the user experience.

[0203] The pressure sensor is electrically connected to the circuit board 53 via a cable. Since the output shaft 20 cannot rotate freely within a 360° range, the cable can be prevented from breaking when the output shaft 20 rotates 360°, thereby ensuring the stability of the electrical connection between the pressure sensor and the circuit board 53.

[0204] See also Fig.14 As shown, in some embodiments, the number of the second limiting members 14 is two, and the first limiting member 21 is located between the two second limiting members 14, and limits the output shaft 20 by abutting against the second limiting members 14. In this way, by adjusting the positions of the two second limiting members 14 on the housing 10, when the output shaft 20 swings (rotates) in the circumferential direction, the output shaft 20 can swing back and forth within the range of 0° to 180° through the abutment cooperation between the first limiting member 21 and the second limiting member 14.

[0205] See also Fig.14 As shown, in some examples, the two second stoppers 14 can be arranged opposite to each other on the inner side wall of the housing 10 in the radial direction of the output shaft 20, and the first stopper 21 can be located between the two second stoppers 14. Furthermore, when the output shaft 20 rotates around its own axial direction, the first stopper 21 can abut against the second stopper 14 to limit the output shaft 20, and make the output shaft 20 reciprocate within the range of 0° to 180°.

[0206] like Fig.14 , the second stopper 14 is provided on the inner side wall of the first end cover 12. In some examples, the second stopper 14 may also be provided on the inner side wall of the housing body 11.

[0207] The first limiting member 21 and the second limiting member 14 can both be a retaining wall, a stopper, a top screw, a screw, etc.

[0208] See also Fig.13 As shown, in some examples, the electric toothbrush further includes an assembly 100. For example, the assembly 100 can be a snap ring on the output shaft 20. The assembly 100 is assembled on the output shaft 20 at a position opposite to the second stopper 14. The first stopper 21 is arranged on the circumferential outer side of the assembly 100, so that the first stopper 21 is arranged on the output shaft 20.

[0209] It should be noted that, without affecting the installation of the output shaft 20 in the housing 10, the first stopper 21 can also be directly provided on the output shaft 20. When the first stopper 21 is directly provided on the output shaft 20, the first stopper 21 can be provided on the output shaft 20 by interference pressing, in-mold injection molding, secondary injection molding, motor shaft grooving, etc.

[0210] When the second stopper 14 is a stopper wall or a stopper, the second stopper 14 can be directly formed on the inner wall of the housing 10. When the second stopper 14 is a top screw or the like, the second stopper 14 can be arranged on the inner wall of the housing 10 by screwing in or the like. In the present application, the structure and fixing method of the first stopper 21 and the second stopper 14 are not limited.

[0211] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0212] In the description of the present application, it should be understood that the terms "include" and "have" and any variations thereof used herein are intended to cover non-exclusive inclusions. For example, a process, method, display structure, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0213] The term "and / or" used in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0214] Unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium, which can enable the internal connectivity of two elements or the interaction relationship between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0215] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electric toothbrush, characterized in that: include: Brush head; The motor comprises a housing, a first driving mechanism, a second driving mechanism and an output shaft, wherein the first driving mechanism, the second driving mechanism and the output shaft are all arranged in the housing, one end of the housing is provided with a protruding hole, the end of the output shaft passes through the protruding hole and is connected to the brush head; the first driving mechanism and the second driving mechanism are both connected to the output shaft; wherein the first driving mechanism is configured to drive the output shaft to rotate relative to its own axis, and the second driving mechanism is configured to drive the output shaft to reciprocate along its own axis; A detection component, comprising a magnetic member and a detection member, wherein the magnetic member is sleeved on the circumferential side wall of the output shaft and rotates synchronously with the output shaft; the detection member can confirm the rotation angle of the output shaft by detecting the rotation angle of the magnetic member; A circuit board, the detection element is arranged on the circuit board, the circuit board is provided with a through hole, and the output shaft passes through the through hole; A reset member is arranged in the shell, a side of the reset member close to the shell is fixed relative to the shell, the circuit board is fixedly arranged on the reset member, and parts of the circuit board and the reset member can reciprocate with the output shaft.

2. The electric toothbrush according to claim 1, characterized in that: The reset member includes a clamping portion, which extends along the axial direction of the output shaft; the clamping portion passes through the through hole, and a part of the clamping portion passes through the through hole to clamp one side of the circuit board, and the clamping portion is gap-matched with the circuit board.

3. The electric toothbrush according to claim 2, characterized in that: The through hole includes an avoidance hole and an avoidance gap, and the wall of the avoidance hole is concave toward the shell side to form the avoidance gap; the position of the clamping part corresponds to the position of the avoidance gap, so that the clamping part clamps one side of the circuit board.

4. The electric toothbrush according to claim 3, characterized in that: Along the circumference of the output shaft, a gap between the clamping portion and the wall forming the avoidance gap is greater than 0 mm and less than or equal to 0.3 mm.

5. The electric toothbrush according to claim 4, characterized in that: In the radial direction of the output shaft, a gap between the clamping portion and the wall forming the avoidance gap is less than or equal to 0.1 mm.

6. The electric toothbrush according to any one of claims 2 to 5, characterized in that: The circuit board and the reset member are bonded and fixed to a portion that is capable of deforming relative to the housing.

7. The electric toothbrush according to any one of claims 1 to 5, characterized in that: The first driving mechanism includes a driving cable; the motor has a tensile wire inside, and the driving cable is electrically connected to the circuit board through the tensile wire, so that the circuit board can drive the output shaft to rotate through the first driving mechanism; The wire diameter of the tensile wire is 1.2 to 3 times the wire diameter of the driving cable.

8. The electric toothbrush according to claim 7, characterized in that: The length L of the tensile wire must meet the following conditions: ， In the formula, D is the maximum displacement of the output shaft in the axial direction, a is a coefficient, and the coefficient is greater than or equal to 2 and less than or equal to 10.

9. The electric toothbrush according to claim 8, characterized in that: The frequency of the motor is 210 Hz.

10. The electric toothbrush according to claim 7, characterized in that: A guide groove is provided on the circumferential outer side of the reset member, and the guide groove allows the tensile wire to pass through, so that the tensile wire is electrically connected to the drive cable.

11. The electric toothbrush according to claim 10, characterized in that: It also includes a protective sleeve, which is arranged in the guide groove. Part of the tensile wire is passed through the protective sleeve. When the output shaft reciprocates, the tensile wire can move relative to the protective sleeve.

12. The electric toothbrush according to claim 7, characterized in that: The motor comprises a winding bracket, the winding bracket comprises a fixing portion and a plurality of winding portions, the fixing portion is fixedly arranged on the housing, the plurality of winding portions are arranged on a side of the fixing portion away from the housing, and the winding portions extend in a circumferential direction; The sum of the lengths of the plurality of winding portions along the circumferential direction accounts for at least 55% of the circumference of the circle where the winding portions are located.

13. The electric toothbrush according to any one of claims 1 to 5, characterized in that: The portion of the output shaft located inside the housing is provided with a structural member; The electric toothbrush further comprises a resisting member, which is arranged on the housing, and at least a portion of the resisting member can resist the output shaft to reduce vibration or resonance between the output shaft and the structural member.

14. The electric toothbrush according to claim 13, characterized in that: At least a portion of the abutment is disposed on a wall forming the extension hole, and the abutment abuts against a portion of the output shaft in a circumferential direction around the output shaft.

15. The electric toothbrush according to claim 14, characterized in that The abutment is annular in shape, the output shaft passes through the abutment, and a portion of the abutment is interference-fitted with the output shaft.

16. The electric toothbrush according to claim 15, characterized in that The portion of the abutment that is interference-fitted with the output shaft occupies at least one sixth of the circumferential side wall of the abutment and is smaller than one half of the circumferential side wall of the abutment.

17. The electric toothbrush according to claim 15, characterized in that The interference thickness between the abutment member and the output shaft is greater than or equal to 0.2 mm and less than or equal to 0.8 mm; And / or, the hardness of the interference fit portion between the abutment member and the output shaft is greater than or equal to 40 Shore degrees and less than or equal to 70 Shore degrees.

18. The electric toothbrush according to claim 13, characterized in that: The structural component is a bearing, and the bearing is sleeved on the circumferential side wall of the output shaft.

19. The electric toothbrush according to any one of claims 1 to 5, characterized in that: The output shaft is provided with a first limiter, and the housing includes a second limiter; When the output shaft swings in the circumferential direction, the first limit member and the second limit member can make the output shaft swing back and forth within a range of 0° to 180°.

20. The electric toothbrush according to claim 19, characterized in that The number of the second limiting members is two, the first limiting member is located between the two second limiting members, and limits the output shaft by abutting against the second limiting members.

21. The electric toothbrush according to claim 20, characterized in that A pressure sensor is arranged on the output shaft, and the pressure sensor is used to detect the force of brushing teeth.

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