Electric toothbrush

Abstract

The embodiment of the utility model provides an electric toothbrush. The electric toothbrush comprises a handle shell, a machine core and a sealing piece. The handle shell is provided with a through hole. The movement is arranged on the handle shell and comprises a motor, and at least part of an output shaft of the motor penetrates through the through hole. The sealing element comprises a first sub-part, a second sub-part and a connecting part, the first sub-part is arranged between the machine core and the inner wall of the through hole, the second sub-part is arranged on the output shaft in a sleeving mode and located in a cavity of the first sub-part, the connecting part is connected with the first sub-part and the second sub-part, and the sealing element is at least used for sealing a gap between the output shaft and the inner wall of the through hole. Under the condition that the output shaft moves in a preset angle range relative to the handle shell, the output shaft drives the second sub-part to move together relative to the handle shell; and under the condition that the output shaft moves outside the preset angle range relative to the handle shell, the output shaft moves relative to the second sub-part. In the application, when the output shaft moves relative to the handle shell, the output shaft does not excessively drag the second sub-part, so that the sealing effect of the sealing element can be ensured.

Description

Technical Field

[0001] The present application relates to the technical field of oral care, and particularly to an electric toothbrush. Background Art

[0002] An electric toothbrush is an electronic device for cleaning the oral cavity. In related technologies, an electric toothbrush includes a brush handle and a toothbrush head. The brush handle includes a handle shell and a movement mechanism disposed in the handle shell. The rotor of the motor in the movement mechanism can rotate 360° relative to the stator of the motor. The rotor has an output shaft, and the output shaft is connected to the toothbrush head and can drive the toothbrush head to vibrate to clean teeth. Generally, a seal is provided between the output shaft and the handle shell, and the seal can prevent liquids or foams from entering the handle shell. However, when the output shaft rotates, the part of the seal connected to the output shaft will be twisted together, which easily tears or detaches the seal from its original position, resulting in the risk of seal failure. Summary of the Utility Model

[0003] In view of the above problems, the present application provides an electric toothbrush that can avoid the problem of seal failure caused by the output shaft tearing or detaching the seal from its original position when the output shaft rotates.

[0004] The electric toothbrush according to an embodiment of the present application includes a handle shell, a movement mechanism, and a seal. The handle shell is provided with a through hole. The movement mechanism is disposed in the handle shell and includes a motor, and at least a part of the output shaft of the motor passes through the through hole. The seal includes a first sub - part, a second sub - part, and a connecting part. The first sub - part is disposed between the movement mechanism and the inner wall of the through hole. The second sub - part is sleeved on the output shaft and is located in the cavity of the first sub - part. The connecting part connects the first sub - part and the second sub - part. The seal is at least used to seal the gap between the output shaft and the inner wall of the through hole. When the output shaft moves relative to the handle shell within a preset angle range, the output shaft drives the second sub - part to move relative to the handle shell together; when the output shaft moves relative to the handle shell outside the preset angle range, the output shaft moves relative to the second sub - part.

[0005] In the electric toothbrush according to the embodiments of the present application, when the output shaft moves relative to the handle housing within a preset angle range, the output shaft drives the second sub - part to move relative to the handle housing together; when the output shaft moves relative to the handle housing outside the preset angle range, the output shaft moves relative to the second sub - part. Thus, when the output shaft moves relative to the handle housing, the output shaft will not overly pull the second sub - part, thereby preventing the second sub - part from being damaged, or preventing the second sub - part from pulling the first sub - part and the connecting part away from their original positions together with the output shaft. Furthermore, on the one hand, the service life of the seal can be extended; on the other hand, the sealing effect of the seal on the gap between the output shaft and the inner wall of the through - hole can be ensured, preventing external water or dust from entering the handle housing through the gap between the output shaft and the inner wall of the through - hole, and improving the stability and reliability of the operation of the electric toothbrush.

[0006] In some embodiments, the movement mechanism further includes a limiting member disposed within the handle housing. A movement space is provided on one of the limiting member and the second sub - part, and a convex portion is provided on the other. When the output shaft moves relative to the handle housing within a preset angle range, the convex portion moves within the movement space; when the output shaft moves relative to the handle housing outside the preset angle range, the convex portion abuts against the side wall of the movement space in the circumferential direction of the output shaft.

[0007] Among them, when the output shaft moves relative to the handle housing within a preset angle range and drives the second sub - part to move relative to the handle housing together, since the seal is made of a flexible material, at least a part of the second sub - part will twist. In this case, the convex portion on the second sub - part can reciprocate between the first side wall and the second side wall; when the output shaft moves relative to the handle housing outside the preset angle range, the convex portion can abut against the first side wall or the second side wall. In this case, the convex portion cooperates with the first side wall or the second side wall to limit the movement of the second sub - part relative to the handle housing, thereby preventing the second sub - part from continuing to rotate with the output shaft and causing excessive torsion of the second sub - part. Furthermore, it can avoid damage to the second sub - part, or prevent the second sub - part from pulling the first sub - part and the connecting part away from their original positions together with the output shaft, ensuring the sealing effect of the seal.

[0008] In some embodiments, a groove is provided on the limiting member, and the groove serves as the movement space. The provision of the groove can reduce the space jointly occupied by the limiting member and the second sub - part, thereby facilitating the miniaturization of the electric toothbrush.

[0009] In some embodiments, two protrusions spaced along the circumferential direction of the output shaft are provided on the limiting member, and the gap between the two protrusions serves as the movement space.

[0010] In some embodiments, the movement mechanism further includes an abutting member disposed within the handle housing and extending into the sealing member. The abutting member and the handle housing jointly clamp the first sub - portion.

[0011] Among them, the abutting member can be located at one end of the motor facing the through - hole and can extend into the sealing member. In this way, the abutting member can jointly clamp and fix the first sub - portion with the handle housing to limit the movement of the sealing member relative to the handle housing. Thus, on the one hand, when the output shaft drives the second sub - portion to move, the first sub - portion can be prevented from being greatly deformed due to the pulling of the second sub - portion, reducing the possibility of the first sub - portion falling off the handle housing; on the other hand, the combination between the first sub - portion and the inner wall of the through - hole can be made more compact, preventing impurities such as water or dust in the outside from entering the handle housing through the gap between the first sub - portion and the inner wall of the through - hole, ensuring the stability and reliability of the electric toothbrush during operation.

[0012] In some embodiments, the movement mechanism further includes a limiting member. The limiting member includes a first side and a second side facing away from each other. The first side of the limiting member abuts against the first sub - portion, and the second side of the limiting member faces the second sub - portion. The abutting member and the limiting member are of an integral structure. The integral structure of the abutting member and the limiting member can simplify the number of parts of the electric toothbrush, thereby improving the assembly efficiency of the electric toothbrush while reducing the production cost of the electric toothbrush.

[0013] In some embodiments, the movement mechanism further includes a limiting member. The limiting member includes a first side and a second side facing away from each other. The first side of the limiting member abuts against the first sub - portion, and the second side of the limiting member faces the second sub - portion. The abutting member and the limiting member are of a split structure.

[0014] In some embodiments, when the output shaft moves relative to the handle housing within a preset angle range, the elastic force of the sealing member is less than the acting force between the output shaft and the sealing member, and the output shaft drives the second sub - portion to move relative to the handle housing between a first position and a second position. When the output shaft moves relative to the handle housing outside the preset angle range, the elastic force is greater than the acting force, the second sub - portion is located at the first position or the second position relative to the handle housing, and the output shaft moves relative to the second sub - portion, and the directions of the elastic force and the acting force are opposite.

[0015] Among them, when the output shaft moves relative to the handle housing within a preset angle range, that is, when the clamping convex portion moves between the first side wall and the second side wall relative to the handle housing, since the seal is made of a flexible material and the second sub - portion is sleeved on the output shaft, the output shaft can drive the second sub - portion to rotate relative to the handle housing together through the frictional force between the output shaft and the second sub - portion of the seal (i.e., the acting force between the output shaft and the seal). At this time, the second sub - portion and the connecting portion can undergo partial deformation. When the output shaft moves relative to the handle housing outside the preset angle range, the clamping convex portion abuts against the first side wall or the second side wall. In this case, the elastic force generated by the deformation of the second sub - portion and the connecting portion (i.e., the elastic force of the seal) will be greater than the acting force, and the output shaft cannot continue to drive the second sub - portion to move relative to the handle housing, thereby preventing the seal from being damaged or falling off due to excessive torsion and ensuring the sealing effect of the seal.

[0016] In some embodiments, when the output shaft drives the second sub - portion to move from the first position to the second position relative to the handle housing, the first angle range of the output shaft movement is greater than the preset angle range. Thus, when the pressure on the electric toothbrush head is relatively large, the output shaft can still drive the second sub - portion to move relative to the handle housing within the first angle range, thereby ensuring the sealing effect of the seal.

[0017] In some embodiments, the difference between the first angle range and the preset angle range is [3°, 10°]. On the one hand, when the pressure on the electric toothbrush head is relatively large, the output shaft can drive the second sub - portion to move relative to the handle housing within the first angle range, thereby ensuring the sealing effect of the seal. On the other hand, when the output shaft moves relative to the handle housing, the output shaft will not cause excessive pulling on the second sub - portion, thereby preventing the second sub - portion from being damaged, or the second sub - portion from pulling the first sub - portion and the connecting portion away from their original positions together with the output shaft, and further extending the service life of the seal and ensuring the sealing effect of the gap between the output shaft and the inner wall of the through - hole.

[0018] In some embodiments, in the axial direction of the output shaft, the length of the second sub - portion is greater than 4 mm. This can enhance the contact tightness between the second sub - portion and the output shaft, thereby improving the sealing effect of the seal.

[0019] In some embodiments, the second sub - portion and / or the connecting portion are provided with corrugated portions, and part of the corrugated portions abuts against the output shaft.

[0020] Among them, the folded part is generally a continuously bent curved surface structure, and the folded part can be deformed when stressed. Thus, when the output shaft drives the second sub-part to rotate relative to the handle housing within a preset angle range, the folded part can be deformed, so that on the one hand, it can prevent the part of the second sub-part other than the folded part from separating from the output shaft, ensuring the sealing between the second sub-part and the output shaft; on the other hand, it can prevent the second sub-part from pulling the first sub-part to cause the first sub-part to separate from the handle housing, ensuring the sealing between the first sub-part and the handle housing.

[0021] In some embodiments, the second sub-part includes a first side and a second side facing away from each other, and the first side of the second sub-part abuts against the output shaft; a limiting part is provided on one of the first side of the second sub-part and the outer peripheral wall of the output shaft, and a matching part is provided on the other, and the limiting part cooperates with the matching part to seal the gap between the second sub-part and the output shaft. Thus, when the second sub-part is sleeved on the output shaft, the limiting part can extend into the matching part, so as to increase the contact area between the second sub-part and the output shaft, and further improve the sealing effect.

[0022] In some embodiments, the second sub-part includes a first side and a second side facing away from each other, and the first side of the second sub-part abuts against the output shaft; the first side of the second sub-part includes an abutting surface and a relief surface that are connected, the relief surface is spaced from the output shaft, and the abutting surface abuts against the output shaft.

[0023] Among them, the setting of the relief surface can reduce the contact area between the second sub-part and the output shaft, thereby reducing the friction between the second sub-part and the output shaft, avoiding excessive pulling of the second sub-part by the output shaft, and ensuring the sealing effect of the seal.

[0024] In some embodiments, in the axial direction of the output shaft, the abutting member of the electric toothbrush includes a first end and a second end that are opposite to each other, and the first end of the abutting member is closer to the through hole than the second end of the abutting member. During the movement of the output shaft along the axial direction of the output shaft, the connecting portion and the first end of the abutting member are kept at a distance. This can prevent the first end of the abutting member from piercing the connecting portion, thereby prolonging the service life of the seal and ensuring the sealing effect of the seal.

[0025] In some embodiments, in the axial direction of the output shaft, the abutting member of the electric toothbrush includes a first end and a second end that are opposite to each other, and the first end of the abutting member is closer to the through hole than the second end of the abutting member. The connecting portion abuts against the first end of the abutting member.

[0026] Among them, when the output shaft drives the second sub - part to rotate relative to the handle housing together, a frictional force (hereinafter referred to as the abutting frictional force) can be generated between the first end of the abutting member and the connecting portion. When the resultant force formed by the abutting frictional force and the elastic force of the seal is greater than the acting force between the output shaft and the seal, the output shaft can move relative to the second sub - part, thereby further reducing the possibility of damage or detachment of the seal due to excessive torsion and ensuring the sealing effect of the seal.

[0027] The above description is only an overview of the technical solution of this application. In order to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above - mentioned and other purposes, features and advantages of this application more obvious and understandable, the following specific embodiments of this application are specifically given. Brief Description of the Drawings

[0028] The above - mentioned and / or additional aspects and advantages of this application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0029] Figure 1 is a schematic perspective view of an electric toothbrush according to some embodiments of this application;

[0030] Figure 2 is Figure 1 a schematic exploded perspective view of the electric toothbrush shown;

[0031] Figure 3 is Figure 1 a schematic cross - sectional view of the electric toothbrush shown;

[0032] Figure 4 is Figure 3 an enlarged schematic view of the part indicated by Ⅳ in;

[0033] Figure 5 is Figure 1 a schematic cross - sectional view of an embodiment of the seal in the electric toothbrush shown;

[0034] Figure 6 is Figure 1 a schematic structural view of a part of the electric toothbrush shown;

[0035] Figure 7 is Figure 1 a schematic cross - sectional view of another embodiment of the seal in the electric toothbrush shown;

[0036] Figure 8 is Figure 1 a schematic cross - sectional view of yet another embodiment of the seal in the electric toothbrush shown.

[0037] Main Element Symbol Description:

[0038] Electric toothbrush 100;

[0039] Handle housing 10, through hole 11, first end 13, second end 15;

[0040] Movement mechanism 20, motor 21, output shaft 211, mating portion 2111, bracket assembly 23;

[0041] Seal 30, first sub - portion 31, second sub - portion 33, first side 331, second side 333, limiting portion 335, relief surface 337, abutting surface 339, connecting portion 35, corrugated portion 37;

[0042] Limiting member 40; Movement space 51, first side wall 511, second side wall 513, convex portion 53;

[0043] Abutting member 60, first end 61, second end 63, abutting portion 65, receiving portion 67; Electric toothbrush head 70. Detailed implementation manner

[0044] The following details the implementation manners of the present application. The examples of the implementation manners are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The implementation manners described below with reference to the drawings are exemplary and are only used to explain the implementation manners of the present application, and should not be construed as a limitation to the implementation manners of the present application.

[0045] In the description of the present application, it should be understood that terms such as "thickness", "upper", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Also, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0046] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to" should be understood in a broad sense. In one example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection, or may communicate with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements.

[0047] An electric toothbrush is an electronic device for cleaning the oral cavity. In related technologies, an electric toothbrush includes a brush handle and a toothbrush head. The brush handle includes a handle housing and a movement mechanism disposed in the handle housing. The rotor of the motor in the movement mechanism can rotate 360° relative to the stator of the motor. The rotor has an output shaft, and the output shaft is connected to the toothbrush head and can drive the toothbrush head to vibrate to clean teeth. Generally, a seal is provided between the output shaft and the handle housing, and the seal can prevent liquids or foams from entering the handle housing. However, when the output shaft rotates, it will drive the part of the seal connected to the output shaft to twist together, easily tearing or detaching the seal from its original position, posing a risk of seal failure. To solve this problem, please refer to Figure 1 , an embodiment of the present application provides an electric toothbrush 100.

[0048] Please refer to Figures 1 to 4 , the electric toothbrush 100 according to the embodiment of the present application includes a handle housing 10, a movement mechanism 20, and a seal 30. The handle housing 10 is provided with a through hole 11. The movement mechanism 20 is disposed in the handle housing 10. The movement mechanism 20 includes a motor 21, and at least a part of the output shaft 211 of the motor 21 passes through the through hole 11. The seal 30 includes a first sub - part 31, a second sub - part 33, and a connecting part 35. The first sub - part 31 is disposed between the movement mechanism 20 and the inner wall of the through hole 11. The second sub - part 33 is sleeved on the output shaft 211 and is located in the cavity of the first sub - part 31. The connecting part 35 connects the first sub - part 31 and the second sub - part 33. The seal 30 is at least used to seal the gap between the output shaft 211 and the inner wall of the through hole 11. When the output shaft 211 moves relative to the handle housing 10 within a preset angle range, the output shaft 211 drives the second sub - part 33 to move relative to the handle housing 10 together; when the output shaft 211 moves relative to the handle housing 10 outside the preset angle range, the output shaft 211 moves relative to the second sub - part 33.

[0049] Among them, the handle housing 10 is a structure for accommodating the movement 20 and other components of the electric toothbrush 100. The handle housing 10 is generally a housing structure with a length greater than the width or diameter, and the length direction of the handle housing 10 is the same as the axial direction X of the output shaft 211. In the axial direction X, the handle housing 10 includes opposite first end 13 and second end 15. A through hole 11 is provided at the first end 13 of the handle housing 10 for the output shaft 211 of the motor 21 to extend out. The material of the handle housing 10 can be a metal material or a non-metal material. Metal materials include but are not limited to aluminum, iron, steel, or aluminum alloy, etc. Non-metal materials include but are not limited to plastics, etc. In one example, the handle housing 10 can be made of a metal material, thereby making the structural strength of the handle housing 10 higher, preventing the handle housing 10 from being damaged during the operation of the electric toothbrush 100, and thus improving the stability and reliability of the operation of the electric toothbrush 100. In another example, the handle housing 10 can be made of a non-metal material, thereby making the handle housing 10 lighter in weight, which is beneficial to the realization of the lightweight of the electric toothbrush 100.

[0050] In some embodiments, the electric toothbrush 100 may further include an electric toothbrush head 70. The electric toothbrush head 70 is connected to the output shaft 211. When the motor 21 operates stably, the motor 21 can drive the electric toothbrush head 70 to vibrate at a high frequency through the output shaft 211. In this way, the electric toothbrush 100 can clean the parts to be cleaned in the oral cavity through the high-frequency vibrating electric toothbrush head 70. Among them, a detachable connection method can be adopted between the output shaft 211 of the motor 21 and the electric toothbrush head 70. On the one hand, this can facilitate the replacement of electric toothbrush heads 70 of different models or different materials; on the other hand, when the service life of the electric toothbrush head 70 is long enough to cause a decline in the cleaning effect, it is convenient to replace a new electric toothbrush head 70, thereby ensuring the cleaning effect of the electric toothbrush 100. It should be noted that in some embodiments, the motor 21 includes but is not limited to a linear motor, a rotary motor, or a bidirectional motor, etc.

[0051] The seal 30 is a flexible structure for sealing the gap between the output shaft 211 and the inner wall of the through hole 11 to prevent impurities such as external water or dust from entering the interior of the handle housing 10. The material of the seal 30 includes but is not limited to silica gel, polyurethane, rubber, or plastic, etc. The first sub-part 31 and the second sub-part 33 can be generally cylindrical structures, and the outer contour dimension of the cross-section of the second sub-part 33 intercepted by a plane perpendicular to the axial direction X of the output shaft 211 is smaller than the outer contour dimension of the cross-section of the first sub-part 31 intercepted by a plane perpendicular to the axial direction X of the output shaft 211. In this way, the second sub-part 33 can be located in the cavity of the first sub-part 31. The connecting part 35 can be generally a ring-shaped structure, and the connecting part 35 connects the first sub-part 31 and the second sub-part 33. In some examples, the connecting part 35 connects the end of the first sub-part 31 opposite to the electric toothbrush head 70 and the end of the second sub-part 33 opposite to the electric toothbrush head 70.

[0052] Specifically, when the second sub - part 33 is sleeved on the output shaft 211, the first side 331 of the second sub - part 33 (the side of the second sub - part 33 opposite to the output shaft 211) abuts against the output shaft 211, and the second side of the first sub - part 31 (the side of the first sub - part 31 opposite to the second sub - part 33) abuts against the inner wall of the through - hole 11. In this way, the seal 30 can seal the gap between the output shaft 211 and the inner wall of the through - hole 11.

[0053] In some embodiments, in the axial direction X of the output shaft 211, the length of the second sub - part 33 is greater than 4 mm. Specifically, in some embodiments, the length of the second sub - part 33 in the axial direction X of the output shaft 211 can be any value greater than 4 mm, such as 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, and 9 mm, or any numerical value between any two of these values.

[0054] If the length of the second sub - part 33 in the axial direction X of the output shaft 211 is less than 4 mm, the contact area between the second sub - part 33 and the output shaft 211 is small, which will result in a small contact tightness between the second sub - part 33 and the output shaft 211, affecting the sealing effect of the seal 30. In some embodiments of the present application, in the axial direction X of the output shaft 211, the length of the second sub - part 33 is greater than 4 mm. In this way, the contact tightness between the second sub - part 33 and the output shaft 211 can be enhanced, thereby improving the sealing effect of the seal 30.

[0055] Please refer to Figure 4 and Figure 5 , in some embodiments, the second sub - part 33 includes a first side 331 and a second side 333 that face away from each other. The first side 331 of the second sub - part 33 abuts against the output shaft 211. A limiting part 335 is provided on one of the first side 331 of the second sub - part 33 and the outer peripheral wall of the output shaft 211, and a mating part 2111 is provided on the other. The limiting part 335 and the mating part 2111 cooperate to seal the gap between the second sub - part 33 and the output shaft 211.

[0056] In one example, the limiting part 335 is provided on the first side 331 of the second sub - part 33, and the mating part 2111 is provided on the outer peripheral wall of the output shaft 211. In another example, the mating part 2111 is provided on the first side 331 of the second sub - part 33, and the limiting part 335 is provided on the outer peripheral wall of the output shaft 211. The following embodiments are only described by taking the limiting part 335 provided on the first side 331 of the second sub - part 33 and the mating part 2111 provided on the outer peripheral wall of the output shaft 211 as an example.

[0057] Specifically, in some embodiments, one of the limiting portion 335 and the mating portion 2111 may be a protrusion, and the other may be a groove. Exemplarily, when the limiting portion 335 is a protrusion and the mating portion 2111 is a groove, the limiting portion 335 protrudes and extends from the first side 331 of the second sub-portion 33 in a direction away from the second side 333 of the second sub-portion 33, and the mating portion 2111 is recessed from the outer peripheral wall of the output shaft 211 in a direction toward the central axis of the output shaft 211. Thus, when the second sub-portion 33 is sleeved on the output shaft 211, the limiting portion 335 can extend into the mating portion 2111, thereby increasing the contact area between the second sub-portion 33 and the output shaft 211, and further improving the sealing effect.

[0058] More specifically, in some embodiments, when one of the limiting portion 335 and the mating portion 2111 is a protrusion and the other is a groove, the volume of the groove may be smaller than the volume of the protrusion. Since the seal 30 is made of a flexible material, when the limiting portion 335 and the mating portion 2111 cooperate, the protrusion may undergo compressive deformation, thereby filling the tiny gaps that may exist in the groove, and further improving the sealing effect.

[0059] In some embodiments, in the axial direction X of the output shaft 211, the limiting portion 335 includes one, and the mating portion 2111 also includes one. In other embodiments, in the axial direction X of the output shaft 211, the limiting portion 335 includes at least two, and the at least two limiting portions 335 are spaced apart. The mating portion 2111 also includes at least two, and the at least two mating portions 2111 are spaced apart. The limiting portion 335 cooperates with the corresponding mating portion 2111 to seal the gap between the second sub-portion 33 and the output shaft 211. It should be noted that when the limiting portion 335 is a protrusion and the mating portion 2111 is a groove, in the same plane perpendicular to the axial direction X of the output shaft 211, the limiting portion 335 may include at least one, and the mating portion 2111 corresponding to the at least one limiting portion 335 may include at least one.

[0060] In some embodiments, the seal 30 is an integral structure, that is, the first sub - part 31, the second sub - part 33 and the connecting part 35 are an integral structure. Thereby, the bonding strength between the first sub - part 31, the second sub - part 33 and the connecting part 35 can be improved, preventing the separation of the first sub - part 31, the second sub - part 33 and the connecting part 35 during the operation of the electric toothbrush 100, and ensuring the sealing effect of the seal 30. In other embodiments, the seal 30 is a split structure, that is, the first sub - part 31, the second sub - part 33 and the connecting part 35 are three different structures. In one example, the first sub - part 31, the second sub - part 33 and the connecting part 35 can be combined together by a detachable connection method. The detachable connection methods include but are not limited to snap connection or screw connection, etc. In another example, the first sub - part 31, the second sub - part 33 and the connecting part 35 can be combined together by a non - detachable connection method. The non - detachable connection methods include but are not limited to bonding or welding, etc.

[0061] In certain embodiments, the preset angle range can be: the angle range in which the output shaft 211 can rotate relative to the handle housing 10 when the electric toothbrush 100 is normally cleaning the part to be cleaned in the oral cavity. Specifically, when the output shaft 211 moves relative to the handle housing 10 within the preset angle range, the output shaft 211 drives the second sub - part 33 to rotate relative to the handle housing 10 together, thereby ensuring the stability of the cooperation between the second sub - part 33 and the output shaft 211 and improving the sealing effect of the seal 30. When the output shaft 211 moves relative to the handle housing 10 outside the preset angle range, the output shaft 211 can move relative to the second sub - part 33, that is, the output shaft 211 will not continue to drive the second sub - part 33 to rotate relative to the handle housing 10, thereby preventing the seal 30 from being damaged or falling off and ensuring the sealing effect of the seal 30.

[0062] In the electric toothbrush 100 according to the embodiment of the present application, when the output shaft 211 moves relative to the handle housing 10 within the preset angle range, the output shaft 211 drives the second sub - part 33 to move relative to the handle housing 10 together; when the output shaft 211 moves relative to the handle housing 10 outside the preset angle range, the output shaft 211 moves relative to the second sub - part 33. In this way, when the output shaft 211 moves relative to the handle housing 10, the output shaft 211 will not cause excessive pulling on the second sub - part 33, thereby preventing the second sub - part 33 from being damaged, or the second sub - part 33, together with the first sub - part 31 and the connecting part 35, from being pulled away from the original position by the output shaft 211. On the one hand, the service life of the seal 30 can be extended; on the other hand, the sealing effect of the seal 30 on the gap between the output shaft 211 and the inner wall of the through - hole 11 can be ensured, preventing external water or dust from entering the handle housing 10 through the gap between the output shaft 211 and the inner wall of the through - hole 11, and improving the stability and reliability of the operation of the electric toothbrush 100.

[0063] The electric toothbrush 100 will be further described below in conjunction with the accompanying drawings.

[0064] Please refer to Figure 2 、 Figure 4 and Figure 5 In some embodiments, the movement mechanism 20 further includes a limiting member 40. The limiting member 40 is disposed within the handle housing 10. A movement space 51 is provided on one of the limiting member 40 and the second sub - portion 33, and a latching protrusion 53 is provided on the other. When the output shaft 211 moves relative to the handle housing 10 within a preset angular range, the latching protrusion 53 moves within the movement space 51. When the output shaft 211 moves relative to the handle housing 10 outside the preset angular range, the latching protrusion 53 abuts against the side wall of the movement space 51 in the circumferential direction of the output shaft 211.

[0065] In some embodiments, the movement space 51 is provided on the limiting member 40, and the latching protrusion 53 is provided on the second sub - portion 33. When the electric toothbrush 100 is assembled, the latching protrusion 53 extends into the movement space 51 to achieve the cooperation between the latching protrusion 53 and the movement space 51. In other embodiments, the latching protrusion 53 is provided on the limiting member 40, and the movement space 51 is provided on the second sub - portion 33. When the electric toothbrush 100 is assembled, the latching protrusion 53 extends into the movement space 51 to achieve the cooperation between the latching protrusion 53 and the movement space 51. The following embodiments will be described only by taking the example that the movement space 51 is provided on the limiting member 40 and the latching protrusion 53 is provided on the second sub - portion 33. Among them, the latching protrusion 53 protrudes and extends from the side of the second sub - portion 33 facing the limiting member 40 (the second side 333 of the second sub - portion 33) towards the limiting member 40.

[0066] Specifically, please refer to Figure 6, in some embodiments, in the circumferential direction of the output shaft 211, the movement space 51 has two side walls spaced apart from each other (i.e., the first side wall 511 and the second side wall 513). Among them, when the output shaft 211 moves relative to the handle housing 10 within a preset angle range and drives the second sub - part 33 to move relative to the handle housing 10 together, since the sealing member 30 is made of a flexible material, at least a part of the second sub - part 33 will be twisted. In this case, the convex portion 53 on the second sub - part 33 can reciprocate between the first side wall 511 and the second side wall 513; when the output shaft 211 moves relative to the handle housing 10 outside the preset angle range, the convex portion 53 can abut against the first side wall 511 or the second side wall 513. In this case, the convex portion 53 cooperates with the first side wall 511 or the second side wall 513 to limit the movement of the second sub - part 33 relative to the handle housing 10, thereby preventing the second sub - part 33 from continuing to rotate with the output shaft 211 and causing excessive torsion of the second sub - part 33, further avoiding damage to the second sub - part 33, or the second sub - part 33 pulling the first sub - part 31 and the connecting portion 35 away from their original positions together, ensuring the sealing effect of the sealing member 30.

[0067] In some embodiments, the limiting member 40 is provided with a groove, and the groove is the movement space 51. The groove recesses from the side of the limiting member 40 facing the second sub - part 33 in a direction away from the second sub - part 33. The convex portion 53 is movably disposed in the groove, and the first side wall 511 and the second side wall 513 are two side walls of the groove in the circumferential direction of the output shaft 211. The setting of the groove can reduce the space jointly occupied by the limiting member 40 and the second sub - part 33, which is beneficial to the miniaturization of the electric toothbrush 100.

[0068] In some other embodiments, the limiting member 40 is provided with two protrusions spaced apart in the circumferential direction of the output shaft 211, and the gap between the two protrusions is the movement space 51. The protrusions protrude and extend from the side of the limiting member 40 facing the second sub - part 33 in a direction towards the second sub - part 33. The convex portion 53 is movably disposed between the two protrusions, and the first side wall 511 and the second side wall 513 are respectively two side walls of the two protrusions facing each other.

[0069] In some embodiments, the limiting member 40 includes a first side and a second side facing away from each other. The first side of the limiting member 40 abuts against the first sub - part 31, and the second side of the limiting member 40 faces the second sub - part 33.

[0070] Specifically, in some embodiments, the movement space 51 may be disposed on the second side of the limiting member 40. For example, when the movement space 51 is a groove, the groove is recessed from the second side of the limiting member 40 towards the first side of the limiting member 40; for another example, when the movement space 51 is a gap between two protrusions spaced circumferentially along the output shaft 211, the protrusions protrude and extend from the second side of the limiting member 40 towards the direction away from the first side of the limiting member 40.

[0071] Please refer to Figure 2 and Figure 4 , in some embodiments, the movement mechanism 20 further includes an abutting member 60. The abutting member 60 is disposed within the handle housing 10 and extends into the sealing member 30. The abutting member 60 and the handle housing 10 jointly clamp the first sub - portion 31.

[0072] Specifically, in some embodiments, the abutting member 60 may be located at one end of the motor 21 facing the through - hole 11 and can extend into the sealing member 30. In this way, the abutting member 60 can jointly clamp and fix the first sub - portion 31 with the handle housing 10 to limit the movement of the sealing member 30 relative to the handle housing 10. Thus, on the one hand, when the output shaft 211 drives the second sub - portion 33 to move, it can prevent the first sub - portion 31 from being greatly deformed due to the pulling of the second sub - portion 33, reducing the possibility of the first sub - portion 31 falling off from the handle housing 10; on the other hand, it can make the combination between the first sub - portion 31 and the inner wall of the through - hole 11 closer, preventing impurities such as water or dust from the outside from entering the handle housing 10 through the gap between the first sub - portion 31 and the inner wall of the through - hole 11, ensuring the stability and reliability of the operation of the electric toothbrush 100. It can be understood that, in some embodiments, the abutting member 60 includes an opposite first side and a second side. The first side of the abutting member 60 abuts against the first sub - portion 31, and the second side of the abutting member 60 faces the second sub - portion 33. Among them, the first side of the abutting member 60 can jointly clamp the first sub - portion 31 with the handle housing 10, and the limiting member 40 may be disposed on the second side of the abutting member 60.

[0073] In some embodiments, the movement mechanism 20 further includes a bracket assembly 23. The bracket assembly 23 is used to mount the motor 21 and other components of the electric toothbrush 100 (such as a battery, etc.). The material of the bracket assembly 23 is a metallic material or a non - metallic material. Among them, the metallic materials include but are not limited to aluminum, iron, steel, or aluminum alloy, etc., and the non - metallic materials include but are not limited to plastics, etc. In one example, the bracket assembly 23 can be made of a combination of metallic material and non - metallic material, thereby enabling the bracket assembly 23 to have higher structural strength, preventing the bracket assembly 23 from being damaged during the operation of the electric toothbrush 100, and improving the stability and reliability of the operation of the electric toothbrush 100. In another example, the bracket assembly 23 can be made of a non - metallic material, thereby enabling the bracket assembly 23 to be lighter in weight, which is beneficial to the realization of the light - weight of the electric toothbrush 100.

[0074] Specifically, in some embodiments, the abutment 60 and the bracket assembly 23 are split structures. When the specifications of the electric toothbrush 100 are different, the sizes of the adapted seal 30 and the bracket assembly 23 will also be different. When the abutment 60 and the bracket assembly 23 are split structures, abutments 60 of different specifications can be installed and adapted to the bracket assembly 23 respectively. In other embodiments, the abutment 60 and the bracket assembly 23 are an integral structure. Among them, the abutment 60 can be a structure formed by extending the bracket assembly 23 in a direction close to the through hole 11. When the abutment 60 and the bracket assembly 23 are an integral structure, when installing the seal 30, the abutment 60 can directly extend into the seal 30 and clamp the first sub-section 31 together with the handle shell 10, without the need for secondary installation, and the structure of the electric toothbrush 100 is simpler.

[0075] More specifically, please combine Figure 4 In some embodiments, the abutment member 60 includes an abutment portion 65 and a receiving portion 67, and the abutment portion 65 and the receiving portion 67 are structures that are connected in sequence along the axial direction X of the output shaft 211. At least a portion of the abutment portion 65 can extend into the gap between the first sub-portion 31 and the second sub-portion 33, and clamp the first sub-portion 31 together with the handle shell 10. The receiving portion 67 can carry the abutment portion 65 and fix the abutment portion 65 to the bracket assembly 23.

[0076] In some embodiments, the abutment member 60 and the limiting member 40 are an integral structure, that is, the abutment member 60 and the limiting member 40 are an integral structure, and in this case, a movement space 51 is provided on the limiting member 40, that is, a movement space 51 is provided on the abutment member 60. Exemplarily, the limiting member 40 may be a part of the structure on the abutment portion 65, so that the number of parts of the electric toothbrush 100 can be simplified, thereby improving the assembly efficiency of the electric toothbrush 100 while reducing the production cost of the electric toothbrush 100.

[0077] In other embodiments, the abutment 60 and the limiting member 40 are split structures, that is, the abutment 60 and the limiting member 40 are two different structures. In one example, the abutment 60 and the limiting member 40 can be connected together in a detachable connection manner, and the detachable connection manner includes but is not limited to a snap connection or a threaded connection. In another example, the abutment 60 and the limiting member 40 can be connected together in a non-detachable connection manner, and the non-detachable connection manner includes but is not limited to bonding or welding. In the embodiments of the present application, only the abutment 60 and the limiting member 40 are an integral structure as an example for description.

[0078] See also Figure 2 and Figure 4, in some embodiments, when the output shaft 211 moves relative to the handle housing 10 within a preset angular range, the elastic force of the seal 30 is less than the acting force between the output shaft 211 and the seal 30, and the output shaft 211 drives the second sub - part 33 to move relative to the handle housing 10 between a first position and a second position. When the output shaft 211 moves relative to the handle housing 10 outside the preset angular range, the elastic force is greater than the acting force, the second sub - part 33 is located at the first position or the second position relative to the handle housing 10, and the output shaft 211 moves relative to the second sub - part 33, and the directions of the elastic force and the acting force are opposite.

[0079] Specifically, please refer to Figure 6 , in some embodiments, when the output shaft 211 moves relative to the handle housing 10 within a preset angular range, that is, when the convex part 53 moves relative to the handle housing 10 between the first side wall 511 and the second side wall 513, since the seal 30 is made of a flexible material and the second sub - part 33 is sleeved on the output shaft 211, therefore, the output shaft 211 can drive the second sub - part 33 to rotate relative to the handle housing 10 together through the frictional force (i.e., the acting force between the output shaft 211 and the seal 30) between the output shaft 211 and the second sub - part 33 of the seal 30. At this time, the second sub - part 33 and the connecting part 35 can undergo partial deformation. When the output shaft 211 moves relative to the handle housing 10 outside the preset angular range, the convex part 53 abuts against the first side wall 511 or the second side wall 513. In this case, the elastic force (i.e., the elastic force of the seal 30) generated by the deformation of the second sub - part 33 and the connecting part 35 will be greater than the acting force, and the output shaft 211 cannot continue to drive the second sub - part 33 to move relative to the handle housing 10, thereby preventing the seal 30 from being damaged or falling off due to excessive torsion and ensuring the sealing effect of the seal 30.

[0080] In some embodiments, when the output shaft 211 drives the second sub - part 33 to move relative to the handle housing 10 from the first position to the second position, the first angular range of the movement of the output shaft 211 is greater than the preset angular range.

[0081] It can be understood that the sealing effect of the seal 30 when the output shaft 211 moves relative to the second sub - part 33 is lower than that when the output shaft 211 drives the second sub - part 33 to move together. During the process of the electric toothbrush 100 cleaning the oral cavity, if the pressure on the electric toothbrush head 70 is relatively large, for example, the user exerts more force during the brushing process, the movement range of the output shaft 211 relative to the handle housing 10 may be greater than the preset angle range. In this case, the output shaft 211 will move relative to the second sub - part 33. However, to ensure the sealing effect of the seal 30, the user does not expect the output shaft 211 to move relative to the second sub - part 33 at this time. Therefore, in some embodiments of the present application, the first angle range of movement of the output shaft 211 is greater than the preset angle range. Thus, when the pressure on the electric toothbrush head 70 is relatively large, the output shaft 211 can still drive the second sub - part 33 to move relative to the handle housing 10 within the first angle range, thereby ensuring the sealing effect of the seal 30.

[0082] Furthermore, in some embodiments, the difference between the first angle range and the preset angle range is [3°, 10°]. Specifically, in some embodiments, the difference between the first angle range and the preset angle range is any one value or any value between any two values among 3°, 4°, 5°, 6°, 7°, 8°, 9° and 10°.

[0083] If the difference between the first angle range and the preset angle range is less than 3°, the difference between the first angle range and the preset angle range is relatively small. When the pressure on the electric toothbrush head 70 is relatively large, the output shaft 211 will move relative to the second sub - part 33, affecting the sealing effect of the seal 30. If the difference between the first angle range and the preset angle range is greater than 10°, the first angle range is too large. When the output shaft 211 drives the second sub - part 33 to rotate relative to the handle housing 10 together, the output shaft 211 will exert excessive pulling on the second sub - part 33, resulting in damage to the second sub - part 33, or the second sub - part 33, together with the first sub - part 31 and the connecting part 35, being pulled away from the original position by the output shaft 211, affecting the sealing effect of the seal 30. In some embodiments of the present application, the difference between the first angle range and the preset angle range is [3°, 10°]. Thus, on the one hand, when the pressure on the electric toothbrush head 70 is relatively large, the output shaft 211 can drive the second sub - part 33 to move relative to the handle housing 10 within the first angle range, thereby ensuring the sealing effect of the seal 30. On the other hand, when the output shaft 211 moves relative to the handle housing 10, the output shaft 211 will not exert excessive pulling on the second sub - part 33, thereby preventing damage to the second sub - part 33, or the second sub - part 33, together with the first sub - part 31 and the connecting part 35, being pulled away from the original position by the output shaft 211. Furthermore, the service life of the seal 30 can be extended, and the sealing effect of the seal 30 on the gap between the output shaft 211 and the inner wall of the through - hole 11 can be ensured.

[0084] See also Figure 2 , Figure 4 and Figure 7 In some embodiments, a corrugated portion 37 is provided on the second sub-portion 33 and / or the connecting portion 35 , and a portion of the corrugated portion 37 is in contact with the output shaft 211 .

[0085] Specifically, in some embodiments, the pleated portion 37 is generally a continuously bent curved surface structure, and the pleated portion 37 can be deformed when subjected to force. Therefore, when the output shaft 211 drives the second sub-portion 33 to rotate relative to the handle shell 10 within a preset angle range, the pleated portion 37 can be deformed, thereby preventing the second sub-portion 33 from being separated from the output shaft 211 except for the pleated portion 37, thereby ensuring the sealing between the second sub-portion 33 and the output shaft 211; and preventing the second sub-portion 33 from pulling the first sub-portion 31 to cause the first sub-portion 31 to be separated from the handle shell 10, thereby ensuring the sealing between the first sub-portion 31 and the handle shell 10.

[0086] In addition, the portion of the corrugated portion 37 on the second sub-portion 33 that protrudes toward the output shaft 211 can come into contact with the output shaft 211, and the portion of the corrugated portion 37 on the second sub-portion 33 that protrudes toward the first sub-portion 31 can be separated from the output shaft 211, that is, only a partial structure of the corrugated portion 37 can form friction with the rotating output shaft 211. Compared with the second sub-portion 33 without the corrugated portion 37, the provision of the corrugated portion 37 can reduce the contact area between the second sub-portion 33 and the output shaft 211, thereby reducing the friction force between the second sub-portion 33 and the output shaft 211, avoiding excessive pulling of the output shaft 211 on the second sub-portion 33, and ensuring the sealing effect of the seal 30.

[0087] See also Figure 2 , Figure 4 and Figure 8 In some embodiments, the first side 331 of the second sub-portion 33 includes a clearance surface 337 and a contact surface 339 connected to each other, the clearance surface 337 is spaced apart from the output shaft 211 , and the contact surface 339 contacts the output shaft 211 .

[0088] Specifically, in some embodiments, the yield surface 337 may be a portion on the first side 331 of the second sub-portion 33 that is spaced from the outer peripheral wall of the output shaft 211, and the abutment surface 339 may be a portion on the first side 331 of the second sub-portion 33 that abuts against the outer peripheral wall of the output shaft 211. Thus, the setting of the yield surface 337 can reduce the contact area between the second sub-portion 33 and the output shaft 211, thereby reducing the friction between the second sub-portion 33 and the output shaft 211, avoiding excessive pulling of the output shaft 211 on the second sub-portion 33, and ensuring the sealing effect of the seal 30.

[0089] See alsoFigure 2 and Figure 3 , in some embodiments, on the axial direction X of the output shaft 211, the abutting member 60 of the electric toothbrush 100 includes opposite first end 61 and second end 63, and the first end 61 of the abutting member 60 is closer to the through hole 11 than the second end 63 of the abutting member 60. Specifically, in some embodiments, the first end 61 of the abutting member 60 is a free end, and the second end 63 of the abutting member 60 is connected to the bracket assembly 23.

[0090] Please refer to Figure 4 , in some embodiments, during the movement of the output shaft 211 along the axial direction X of the output shaft 211, the connecting portion 35 and the first end 61 of the abutting member 60 maintain a gap.

[0091] Specifically, in some embodiments, when the abutting member 60 extends into the seal 30, there is a gap between the first end 61 of the abutting member 60 and the connecting portion 35 on the axial direction X of the output shaft 211, and during the movement of the output shaft 211 along the axial direction X, the connecting portion 35 and the first end 61 of the abutting member 60 always maintain a gap, so that the first end 61 of the abutting member 60 can be prevented from piercing the connecting portion 35, thereby the service life of the seal 30 can be prolonged and the sealing effect of the seal 30 can be ensured. It can be understood that in this embodiment, the motor 21 is a linear motor.

[0092] Please refer to Figure 4 , in some embodiments, the connecting portion 35 abuts against the first end 61 of the abutting member 60.

[0093] Specifically, in some embodiments, when the abutting member 60 extends into the seal 30, the first end 61 of the abutting member 60 abuts against the connecting portion 35 on the axial direction X of the output shaft 211. Thus, when the output shaft 211 drives the second sub - portion 33 to rotate relative to the handle housing 10 together, a frictional force (hereinafter referred to as the abutting frictional force) can be generated between the first end 61 of the abutting member 60 and the connecting portion 35. When the resultant force formed by the abutting frictional force and the elastic force of the seal 30 is greater than the acting force between the output shaft 211 and the seal 30, the output shaft 211 can move relative to the second sub - portion 33, so that the possibility of damage or detachment of the seal 30 due to excessive torsion can be further reduced, and the sealing effect of the seal 30 can be ensured. It can be understood that in this embodiment, the motor 21 is a rotary motor.

[0094] In the description of this specification, the descriptions referring to the terms "certain embodiments", "in one example", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0095] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. An electric toothbrush, characterized in that: include: A handle shell, wherein the handle shell is provided with a through hole; A movement, the movement being arranged in the handle housing, the movement comprising a motor, at least a portion of an output shaft of the motor passing through the through hole; and A sealing member, the sealing member comprising a first sub-member, a second sub-member and a connecting member, the first sub-member being arranged between the movement and the inner wall of the through hole, the second sub-member being sleeved on the output shaft and located in the cavity of the first sub-member, the connecting member connecting the first sub-member and the second sub-member, the sealing member being used at least to seal a gap between the output shaft and the inner wall of the through hole; When the output shaft moves within a preset angle range relative to the handle shell, the output shaft drives the second sub-section to move relative to the handle shell; when the output shaft moves outside the preset angle range relative to the handle shell, the output shaft moves relative to the second sub-section.

2. The electric toothbrush according to claim 1, characterized in that: The movement also includes: A limit member, wherein the limit member is arranged in the handle shell, and a movement space is provided on one of the limit member and the second sub-part, and a convex portion is provided on the other. When the output shaft moves within a preset angle range relative to the handle shell, the convex portion moves in the movement space; when the output shaft moves outside the preset angle range relative to the handle shell, the convex portion interferes with the side wall of the movement space in the circumferential direction of the output shaft.

3. The electric toothbrush according to claim 2, characterized in that: The limiting member is provided with a groove, and the groove is the movement space; or The limiting member is provided with two protrusions spaced apart along the circumferential direction of the output shaft, and the gap between the two protrusions is the movement space.

4. The electric toothbrush according to claim 1, characterized in that: The movement also includes: An abutment member is disposed in the handle shell and extends into the sealing member. The abutment member and the handle shell jointly clamp the first sub-portion.

5. The electric toothbrush according to claim 4, characterized in that: The movement further includes a limiting member, the limiting member includes a first side and a second side opposite to each other, the first side of the limiting member abuts against the first sub-portion, and the second side of the limiting member is opposite to the second sub-portion; The abutment member and the limiting member are an integral structure; or The abutting member and the limiting member are separate structures.

6. The electric toothbrush according to claim 1, characterized in that: When the output shaft moves relative to the handle shell within a preset angle range, the elastic force of the seal is smaller than the acting force between the output shaft and the seal, and the output shaft drives the second sub-part to move relative to the handle shell between the first position and the second position; When the output shaft moves relative to the handle shell outside the preset angle range, the elastic force is greater than the action force, the second sub-section is located at the first position or the second position relative to the handle shell, and the output shaft moves relative to the second sub-section, and the elastic force and the action force are in opposite directions.

7. The electric toothbrush according to claim 1, characterized in that: When the output shaft drives the second sub-part to move from the first position to the second position relative to the handle housing, the first angular range of movement of the output shaft is greater than the preset angular range.

8. The electric toothbrush according to claim 7, characterized in that: The difference between the first angle range and the preset angle range is [3°, 10°].

9. The electric toothbrush according to claim 1, characterized in that: In the axial direction of the output shaft, the length of the second sub-portion is greater than 4 mm.

10. The electric toothbrush according to claim 1, characterized in that: The second sub-portion and / or the connecting portion is provided with a corrugated portion, and part of the corrugated portion abuts against the output shaft.

11. The electric toothbrush according to claim 1, characterized in that: The second sub-section includes a first side and a second side opposite to each other, and the first side of the second sub-section abuts against the output shaft; a limiting portion is provided on one of the first side of the second sub-section and the outer peripheral wall of the output shaft, and a matching portion is provided on the other, and the limiting portion cooperates with the matching portion to seal the gap between the second sub-section and the output shaft.

12. The electric toothbrush according to claim 1, characterized in that: The second sub-section includes a first side and a second side opposite to each other, the first side of the second sub-section abuts against the output shaft; the first side of the second sub-section includes a yielding surface and an abutting surface connected to each other, the yielding surface is spaced from the output shaft, and the abutting surface abuts against the output shaft.

13. The electric toothbrush according to claim 1, characterized in that: In the axial direction of the output shaft, the abutment member of the electric toothbrush comprises a first end and a second end opposite to each other, and the first end of the abutment member is closer to the through hole than the second end of the abutment member; During the axial movement of the output shaft, the connecting portion maintains a gap with the first end of the abutment member; or The connecting portion abuts against the first end of the abutting member.

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