Connecting structure of motor output shaft and brush head mounting shaft of electric toothbrush

Abstract

The utility model relates to the technical field of electric toothbrushes, in particular to a connecting structure for a motor output shaft and a brush head mounting shaft of an electric toothbrush, which comprises a main body connecting piece used for connecting a motor shaft body and a brush head mounting handle, and the main body connecting piece comprises a first fixing piece and a second fixing piece which are matched with each other for use; the first fixing piece is detachably connected with the motor shaft body, an extension part is arranged at the end, away from the first fixing piece, of the second fixing piece, a limiting part is arranged on the extension part, and the limiting part is used for being connected with a brush head mounting handle in a matched mode. Through the design of the first fixing piece, the second fixing piece and the extension part, the stable connection of the motor shaft body and the brush head mounting handle is realized, and the assembly is convenient. The design of the extension part transfers the waterproof requirements of the motor shaft body and the handle top to the extension part and the handle top, so that the waterproof effect is improved. In addition, the length of the extension part is adjustable, so that the same motor shaft body can adapt to various toothbrush handles, and the universality is improved.

Description

Technical Field

[0001] This utility model relates to the field of electric toothbrush technology, and in particular discloses a connection structure between the output shaft of an electric toothbrush motor and the brush head mounting shaft. Background Technology

[0002] In the existing technology, the motor output shaft is directly and detachably connected to the brush head mounting handle through a snap-fit ​​structure, which reduces the applicable scenarios for motor output shafts of the same length. In addition, this direct connection structure results in poor waterproofing effect when waterproofing is applied.

[0003] For example, the patent with publication number CN205198179U, entitled "A Detachable Brush Head Connection Structure for an Electric Toothbrush," includes a fixed insert and a drive component that can be inserted into the fixed insert. The fixed insert is provided with a socket for the drive component to be inserted into, and the drive component is provided with a latch and a limiting part that extends into the latch. The drive component is a deflection shaft integrated with the motor, and its length is relatively short. If its length is directly extended, the cost of the motor will increase accordingly, and the adaptability will not be high. In addition, the drive component directly protrudes from the top of the toothbrush handle, which is the top of the fixed insert, so waterproofing treatment is required between the top of the drive component and the top of the fixed insert, resulting in poor waterproofing effect. Utility Model Content

[0004] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a connection structure between the output shaft of the electric toothbrush motor and the brush head mounting shaft, so as to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides a connection structure between the output shaft of an electric toothbrush motor and the brush head mounting shaft, comprising a main connecting member for connecting the motor shaft and the brush head mounting handle. The main connecting member includes a first fixing member and a second fixing member. The first fixing member is detachably connected to the motor shaft. The end of the second fixing member away from the first fixing member extends in a direction away from the first fixing member and is provided with an extension portion. The extension portion is provided with a limiting portion, which is used to cooperate with the brush head mounting handle for connection.

[0006] Furthermore, the first fixing member includes a first clamp and a second clamp clamped on the outside of the motor shaft. The motor shaft is provided with a first limiting plane along its axial direction. The first clamp and the second clamp are provided with a second limiting plane that abuts against the first limiting plane. The outer wall of the motor shaft is recessed with a first limiting groove along its radial direction. The inner walls of the first clamp and the second clamp are provided with limiting protrusions for extending into the first limiting groove.

[0007] Since the motor shaft is usually formed by machining a metal cylindrical bar, and the maximum diameter of the metal bar is usually used as the maximum diameter after machining and shaping, if the motor shaft adopts an externally convex annular platform design, the maximum diameter of the overall metal bar will increase, that is, the raw material of the profile to be processed increases, and the amount of processing also increases accordingly. Therefore, the form of a recessed first limiting groove is adopted. This design saves motor manufacturing costs while ensuring connection stability.

[0008] Furthermore, the first clamp and the second clamp have the same shape and structure, and both the first clamp and the second clamp have a limiting rotation groove that matches the shape of the motor shaft.

[0009] Furthermore, the first and second fixing components are separate structures. The outer wall of the first fixing component is provided with a locking block, and one end of the second fixing component is tubular with two narrow openings on the tube wall, thereby forming two symmetrical first elastic arms on the tube wall. The inner wall of the first elastic arm is provided with a locking hole or slot for accommodating the locking block.

[0010] Furthermore, the outer side of the end of the first fixing member away from the motor shaft is provided with a first inclined guide surface, and the inner wall of the end of the second fixing member away from the brush head mounting handle is provided with a second inclined guide surface that abuts against and cooperates with the first inclined guide surface.

[0011] Furthermore, the limiting part protrudes from the outer wall of the extension part, and two arc-shaped snap-fit ​​grooves are symmetrically arranged on both sides of the limiting part. The main body connector also includes a brush head fixing part connected to the brush head mounting handle. The brush head fixing part is provided with two second elastic arms, and the second elastic wall is provided with an arc-shaped snap protrusion that extends into the arc-shaped snap-fit ​​groove.

[0012] Furthermore, the outer wall of the brush head fixing component is provided with a second limiting groove, and the inner wall of the brush head mounting handle near the motor shaft is provided with a limiting rib for extending into the second limiting groove. The limiting rib is arranged in a straight strip along the axial direction of the motor shaft.

[0013] Furthermore, the connection structure also includes a sealing element, with a stop boss on the outer side of the sealing element, and a stop ring that abuts against the stop boss in the mounting cavity of the toothbrush handle housing. An elastic ring is provided on the inner side of the sealing element, and the elastic ring has a hollow portion for the extension of the second fixing member to pass through. A first annular boss is provided on the outer wall of the second fixing member, and the free end of the elastic ring is used to abut against the first annular boss of the second fixing member to prevent the second fixing member from exiting the mounting cavity of the toothbrush handle housing.

[0014] Furthermore, a flexible silicone ring is provided between the contact surfaces of the stop boss and the stop ring, and the outer wall of the seal is interference-fitted with the inner wall of the stop ring.

[0015] Furthermore, a protective cylinder is provided inside the mounting cavity of the toothbrush handle housing. One end of the protective cylinder is sleeved on the outside of the motor body, and a second annular boss is provided at the end of the protective cylinder away from the motor body. The stop boss is located between the first annular boss and the stop ring.

[0016] Furthermore, the inner wall of the elastic ring is provided with an arc-shaped rib, and the outer wall of the second fixing member is provided with an arc-shaped groove for accommodating the arc-shaped rib.

[0017] This utility model provides a connection structure between the output shaft of an electric toothbrush motor and the brush head mounting shaft. The structure connects the motor shaft and the brush head mounting handle via a main connecting member, which consists of a first fixing member and a second fixing member. The first fixing member is detachably connected to the motor shaft via a clamp and a limiting structure; the second fixing member extends into an extension with a limiting portion for connecting the brush head mounting handle. The first and second fixing members are of a separate structure, achieving a secure connection through the snap-fit ​​of a locking block and a locking hole in the first elastic arm. Furthermore, it includes a brush head fixing member that snaps into the brush head mounting handle, achieving a secure connection between the main connecting member and the brush head fixing member through the snap-fit ​​of the second elastic arm and the arc-shaped locking groove of the limiting portion of the brush head mounting handle. The design of the sealing element and protective sleeve further enhances the stability and sealing of the structure.

[0018] The beneficial effects of this utility model are as follows: By adding a first fixing member and a second fixing member, and setting an extension part at the end of the second fixing member, the extension part is fixedly connected to the motor shaft with the help of the first fixing member. The connection structure is stable and easy to assemble. The extension part and the top of the handle (i.e., the top of the aforementioned toothbrush housing) are treated with waterproof components, avoiding the application of a solution that requires waterproof components between the motor shaft and the top of the handle, resulting in better waterproof performance. The extension part can be set with different lengths according to different application scenarios, so as not to change the length of the motor deflection shaft. It can realize the application scenario requirement of using a motor shaft of the same length for multiple toothbrush handles. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the brush head mounting handle and the toothbrush handle shell of this utility model;

[0020] Figure 2 This is an exploded structural diagram of the main connecting component of this utility model;

[0021] Figure 3 This is an exploded structural diagram of the first fixing member and the motor shaft of this utility model;

[0022] Figure 4 This is a structural schematic diagram of the brush head fixing component of this utility model;

[0023] Figure 5This is a schematic diagram of the structure of the second fixing member of this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the brush head mounting handle and the brush head fixing component of this utility model.

[0025] Figure 7 This is a cross-sectional view of the connection structure of this utility model;

[0026] Figure 8 for Figure 7 A magnified structural diagram of part A in the middle.

[0027] The reference numerals in the figures include:

[0028] 1. Motor shaft; 2. Brush head mounting handle; 3. Main body connector; 4. Brush head fixing component; 5. Seal; 6. Toothbrush handle housing; 61. Stop ring; 62. Protective cylinder; 621. Second annular boss; 11. First limiting plane; 12. First limiting groove; 21. Limiting rib; 31. First fixing component; 310. Second limiting plane; 311. First clamp; 312. Second clamp; 313. Limiting protrusion; 314. Locking block; 3141, Inclined guide surface; 315, First inclined guide surface; 316, Limiting rotation groove; 32, Second fixing member; 321, Extension; 322, Limiting part; 3221, Arc-shaped snap-fit ​​groove; 323, First elastic arm; 3230, Narrow opening; 3231, Snap-fit ​​hole; 324, Second inclined guide surface; 325, First annular boss; 326, Arc-shaped groove; 41, Second elastic arm; 42, Arc-shaped snap-fit ​​protrusion; 43, Second limiting groove; 51, Stop boss; 511, Silicone ring; 52, Elastic ring; 521, Arc-shaped rib. Detailed Implementation

[0029] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0030] Please see Figures 1 to 8 As shown, the present invention discloses a connection structure between the output shaft of an electric toothbrush motor and the brush head mounting shaft, including a main connecting member 3 for connecting the motor shaft 1 and the brush head mounting handle 2. The main connecting member 3 includes a first fixing member 31 and a second fixing member 32. The first fixing member 31 is detachably connected to the motor shaft 1. The end of the second fixing member 32 away from the first fixing member 31 extends in a direction away from the first fixing member 31 and is provided with an extension portion 321. The extension portion 321 is provided with a limiting portion 322, which is used to cooperate with the brush head mounting handle 2 for connection.

[0031] The core of the connection structure between the electric toothbrush motor output shaft and the brush head mounting shaft lies in the main connecting component 3. The main connecting component 3 consists of a first fixing component 31 and a second fixing component 32. The first fixing component 31 adopts a clamp structure and is detachably fixed to the motor shaft 1. Axial and circumferential fixation is achieved through the engagement of an inner wall limiting protrusion 313 with an outer wall limiting groove of the motor shaft 1. The second fixing component 32 is connected to the first fixing component 31 via an extension 321. The end of the extension 321 has a limiting part 322 for connecting to the brush head mounting handle 2. This split design allows the connection between the motor shaft 1 and the brush head mounting handle 2 to transition through the main connecting component 3, improving connection flexibility and maintainability.

[0032] In actual manufacturing, the first fixing member 31 consists of two semi-circular clamps (first clamp 311 and second clamp 312). The extension 321 of the second fixing member 32 can be cylindrical, square, etc., and can be lengthened to adapt to different toothbrush structures. The limiting part 322 can be a protruding buckle or a groove, which cooperates with the corresponding structure of the brush head mounting handle 2 to achieve quick assembly and disassembly.

[0033] This connection structure, through the main connecting member 3, achieves a reliable and flexible connection between the motor shaft 1 and the brush head mounting handle 2. The clamping structure and limiting design of the first fixing member 31 ensure a stable connection of the motor shaft 1 and improve transmission efficiency. The extension part 321 and the limiting part 322 of the second fixing member 32 facilitate quick assembly and disassembly of the brush head mounting handle 2, improving usability. The extension part 321 can be set to different lengths according to different application scenarios, thus without changing the length of the motor's deflection shaft, enabling a motor with the same deflection shaft length to be used in multiple application scenarios.

[0034] Specifically, please refer to Figure 3 As shown, the first fixing member 31 includes a first clamp 311 and a second clamp 312 with the same shape and structure, which are clamped on the outside of the motor shaft 1. A first limiting plane 11 is provided on the outer side of the motor shaft 1 along its axial direction, and the inner walls of the first clamp 311 and the second clamp 312 are provided with a second limiting plane 310 that abuts against the first limiting plane 11. Furthermore, a first limiting groove 12 is recessed on the outer wall of the motor shaft 1 along its radial direction, and the inner walls of the first clamp 311 and the second clamp 312 are provided with limiting protrusions 313 for extending into the first limiting groove 12. This structure, through the combination of the clamps, limiting planes, and limiting protrusions 313, effectively prevents the first fixing member 31 and the motor shaft 1 from displacement in the axial direction and rotation in the circumferential direction, thus achieving a stable connection between the first fixing member 31 and the motor shaft 1.

[0035] For details, please continue reading Figure 3As shown, since the motor shaft 1 is usually formed by machining a metal cylindrical bar, and the maximum diameter of the metal bar is usually used as the maximum diameter after machining and shaping, if the motor shaft 1 adopts an externally convex annular platform design, the maximum diameter of the overall metal bar will increase, that is, the processing material material increases, and the processing amount also increases accordingly. Therefore, the form of a recessed first limiting groove 12 is adopted. This design saves the motor manufacturing cost while ensuring connection stability.

[0036] Specifically, please refer to the following: Figure 2 , Figure 3 and Figure 5 As shown, the first fixing member 31 and the second fixing member 32 are of a split structure. The outer wall of the first fixing member 31 is provided with a locking block 314, while one end of the second fixing member 32 is tubular, with two narrow openings 3230 on the tube wall, thus forming two symmetrical first elastic arms 323. The inner wall of each first elastic arm 323 is provided with a locking hole 3231 (in actual manufacturing, this can be a locking groove that does not penetrate the body of the first elastic arm 323), used to accommodate and cooperate with the locking block 314 on the outer wall of the first fixing member 31. The connection between the first fixing member 31 and the second fixing member 32 is achieved through the cooperation of the locking block 314 with the locking hole 3231 / slot.

[0037] The separate construction of the first fixing member 31 and the second fixing member 32 allows them to be manufactured and assembled independently, improving the flexibility of production and maintenance. In this embodiment, there are two locking blocks 314, which protrude from the outer walls of the first clamp 311 and the second clamp 312, respectively. Each locking block 314 is provided with an inclined guide surface 3141 for easy assembly. One end of the second fixing member 32 is tubular, and two narrow openings 3230 are formed on the tube wall to form two symmetrical first elastic arms 323. The first elastic arms 323 are made of two semi-annular structures, forming an accommodating space (not shown in the figure) for accommodating the first fixing member 31. The inner wall of the first elastic arm 323 is machined with locking holes 3231, which match the locking blocks 314 on the first fixing member 31. When the first fixing member 31 and the second fixing member 32 are assembled, the locking blocks 314 will be embedded in the corresponding locking holes 3231, and the elastic deformation of the first elastic arms 323 will provide a fastening force, thereby achieving a stable connection. This design allows for a certain degree of displacement and angular adjustment, which helps to accommodate manufacturing tolerances and installation errors.

[0038] Furthermore, the design of the first elastic arm 323 can absorb energy when subjected to external impact, reducing damage to the motor shaft 1 and brush head mounting handle 2, thereby improving the overall durability of the electric toothbrush. Compared with existing technologies, this design not only enhances the stability and durability of the structure, but also improves production efficiency and reduces maintenance costs due to its simplified assembly process.

[0039] Specifically, the first fixing member 31 is preferably made of metal material (such as stainless steel or aluminum alloy) to ensure its strength, rigidity and wear resistance, and to achieve a reliable connection with the motor shaft 1; the second fixing member 32 is preferably made of engineering plastic (such as polyoxymethylene, polyamide or polycarbonate) in one piece to ensure its elasticity, toughness and lightweight, and to achieve a reliable connection with the first fixing member 31 and the brush head fixing member 4.

[0040] Please continue reading. Figure 3 and Figure 5 As shown, in this embodiment, the first fixing member 31 has a first inclined guide surface 315 on the outer side of its end away from the motor shaft 1. The first inclined guide surface 315 is a sloping structure, which guides and positions the installation of the second fixing member 32. Correspondingly, the second fixing member 32 has a second inclined guide surface 324 on its inner wall at its end away from the brush head mounting handle 2. This guide surface is also a sloping structure, used to mate with the first inclined guide surface 315 on the first fixing member 31. During assembly, the second fixing member 32 slides along the first inclined guide surface 315 until the second inclined guide surface 324 on its inner wall abuts against the first inclined guide surface 315. This design ensures the correct alignment between the first fixing member 31 and the second fixing member 32, thereby guaranteeing the precise connection between the motor output shaft and the brush head mounting shaft.

[0041] Please combine them together Figure 4 and Figure 5 As shown, in this embodiment, the limiting part 322 is designed as a structure protruding from the outer wall of the extension part 321, with two arc-shaped locking grooves 3221 symmetrically arranged on both sides. This design allows a stable mechanical interlock to be formed between the limiting part 322 and the brush head fixing member 4. The brush head fixing member 4 is part of the main body connecting member 3 and is connected to the brush head mounting handle 2. The brush head fixing member 4 is equipped with two second elastic arms 41, each of which has an arc-shaped locking protrusion 42. These arc-shaped locking protrusions 42 (two are symmetrically arranged in this embodiment, but in actual use, two can be arranged as a group, and multiple groups can be used in combination) can be precisely embedded in the arc-shaped locking grooves 3221 of the limiting part 322. When the brush head mounting handle 2 is installed in place, the arc-shaped locking protrusions 42 of the second elastic arms 41 and the arc-shaped locking grooves 3221 of the limiting part 322 engage with each other, thereby achieving a firm connection.

[0042] Compared to existing technologies, this mechanical interlocking method effectively prevents the brush head from accidentally falling off or loosening during brushing, enhancing the user experience. Simultaneously, the design of the second elastic arm 41 can absorb and mitigate the impact of misoperation during installation or vibration during use, thereby extending the electric toothbrush's lifespan and improving overall performance.

[0043] Specifically, please continue to combine Figure 4 and Figure 5 As shown, the outer wall of the brush head fixing component 4 is designed with a second limiting groove 43, which is used to cooperate with the limiting ribs 21 on the inner wall of the brush head mounting handle 2. The inner wall of the end of the brush head mounting handle 2 near the motor shaft 1 is machined with a structure having limiting ribs 21, which can extend into the second limiting groove 43 on the brush head fixing component 4. The limiting ribs 21 are designed to be arranged in a straight strip along the axial direction of the motor shaft 1. This design can ensure the axial stability and fixation of the brush head mounting handle 2, preventing it from shifting or loosening during motor operation.

[0044] Specifically, there are four limiting ribs 21, which are arranged around the central axis of the brush head mounting handle 2. Similarly, there are also four second limiting grooves 43. In actual use, different numbers of second limiting grooves 43 and limiting ribs 21 can be set according to the product application scenario.

[0045] Specifically, please refer to the following: Figure 5 and Figure 8 As shown, the connection structure also includes a seal 5, which is located between the extension 321 of the second fixing member 32 and the toothbrush handle housing 6. The outer side of the seal 5 is designed with a stop boss 51, which abuts against the stop ring 61 inside the toothbrush handle housing 6 to prevent the seal 5 from moving or falling off within the mounting cavity. The inner side of the seal 5 is fitted with an elastic ring 52, which has a hollow portion. The extension 321 of the second fixing member 32 can pass through this hollow portion through one end of the toothbrush housing mounting cavity and extend out of the toothbrush housing to facilitate the connection of the toothbrush handle.

[0046] The outer wall of the second fixing member 32 is provided with a first annular boss 325. The free end of the elastic ring 52 is designed to abut against the first annular boss 325, thereby further fixing the position of the second fixing member 32 and preventing it from exiting the mounting cavity of the toothbrush handle housing 6.

[0047] This sealing structure design provides an effective waterproof and dustproof mechanism, enhancing the durability and reliability of the electric toothbrush. The cooperation between the retaining boss 51 and the stop ring 61 ensures the stability of the seal 5 within the mounting cavity. The interaction between the elastic ring 52 and the first annular boss 325 not only provides additional fixing force for the second fixing member 32 but also helps to mitigate vibrations and impacts generated during use, thereby extending the lifespan of the electric toothbrush. Compared to existing technologies, this design simplifies the component installation process while improving the overall sealing performance of the structure and reducing the risk of damage to the internal components of the electric toothbrush from moisture and dirt.

[0048] Specifically, please refer to Figure 8As shown, a flexible silicone ring 511 is provided between the contact surfaces of the stop boss 51 and the stop ring 61, and the outer wall of the sealing member 5 is interference-fitted with the inner wall of the stop ring 61. As an elastomer, the silicone ring 511 effectively fills the tiny gaps between the stop boss 51 and the stop ring 61, thereby preventing moisture and dirt from penetrating the toothbrush through these gaps. Furthermore, the outer wall of the sealing member 5 is interference-fitted with the inner wall of the stop ring 61. This interference fit means that the outer wall size of the sealing member 5 is slightly larger than the inner diameter of the stop ring 61. Slight compression allows the sealing member 5 to fit tightly against the inner wall of the stop ring 61, further enhancing the sealing effect.

[0049] Specifically, please refer to the following: Figure 2 and Figure 8 As shown, to further enhance the structural stability of the electric toothbrush and protect its internal components, a protective sleeve 62 is provided inside the mounting cavity of the toothbrush handle housing 6. One end of the protective sleeve 62 is fitted onto the outside of the motor body (so that the motor shaft 1, the first fixing member 31, and the first elastic arm 323 of the second fixing member 32 are all inside the protective sleeve 62), serving to fix and protect the internal structure. The other end of the protective sleeve 62 is provided with a second annular boss 621, and a stop boss 51 is located between the second annular boss 621 and the stop ring 61. This structural design ensures that the seal 5 is securely fixed within the mounting cavity of the toothbrush housing and will not fall off. In addition, this design ensures that when the electric toothbrush is subjected to external impact, the protective sleeve 62 can effectively disperse and absorb the impact force, reducing damage to the motor shaft 1 and the connecting structure.

[0050] Specifically, please refer to the following: Figure 5 and Figure 8 As shown, to enhance the stability and sealing capability of the connection structure, the inner wall of the elastic ring 52 is designed with protruding arc-shaped ribs 521. The shape and size of these ribs precisely match the arc-shaped grooves 326 on the outer wall of the second fastener 32. When the second fastener 32 is installed in place, the arc-shaped ribs 521 of the elastic ring 52 embed into the arc-shaped grooves 326 on the outer wall of the second fastener 32. This design not only provides additional mechanical locking but also enhances the sealing between the seal 5 and the second fastener 32 through the tight fit between the arc-shaped ribs 521 and the arc-shaped grooves 326. Furthermore, the elastic properties of the elastic ring 52 can absorb vibration and impact, thereby protecting the connection structure from damage.

[0051] The present invention adds a first fixing member 31 and a second fixing member 32, and provides an extension part 321 at the end of the second fixing member 32. The extension part 321 is fixedly connected to the motor shaft 1 by means of the first fixing member 31. The connection structure is stable and easy to assemble. The extension part 321 and the top of the handle (i.e. the top of the aforementioned toothbrush housing) are treated with waterproof components to avoid the application of the solution that requires waterproof components between the motor shaft 1 and the top of the handle, and the waterproof effect is better. The extension part 321 can be set with different lengths according to different application scenarios, so as not to change the length of the motor deflection shaft. It can realize the application scenario requirement of using a motor shaft 1 of the same length for multiple toothbrush handles.

[0052] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A connection structure between the output shaft of an electric toothbrush motor and the brush head mounting shaft, characterized in that, The main body connector (3) includes a motor shaft (1) and a brush head mounting handle (2) for connecting the motor shaft (1) and the brush head mounting handle (2). The main body connector (3) includes a first fixing member (31) and a second fixing member (32) that cooperate with each other. The first fixing member (31) is detachably connected to the motor shaft (1). The second fixing member (32) has an extension (321) at one end away from the first fixing member (31). The extension (321) is provided with a limiting part (322), which is used to cooperate with the brush head mounting handle (2).

2. The connection structure between the electric toothbrush motor output shaft and the brush head mounting shaft according to claim 1, characterized in that: The first fixing member (31) includes a first clamp (311) and a second clamp (312) clamped on the outside of the motor shaft (1). The motor shaft (1) is provided with a first limiting plane (11) along its axial direction. The first clamp (311) and the second clamp (312) are provided with a second limiting plane (310) that abuts against the first limiting plane (11).

3. The connection structure between the electric toothbrush motor output shaft and the brush head mounting shaft according to claim 1, characterized in that: The outer wall of the motor shaft (1) is recessed in the radial direction with a first limiting groove (12), and the inner walls of the first clamp (311) and the second clamp (312) are provided with limiting protrusions (313) for extending into the first limiting groove (12).

4. The connection structure between the electric toothbrush motor output shaft and the brush head mounting shaft according to claim 1, characterized in that: The first fixing member (31) and the second fixing member (32) are separate structures. The outer wall of the first fixing member (31) is provided with a locking block (314). One end of the second fixing member (32) is provided with at least one narrow opening (3230) and at least one first elastic arm (323). The first elastic arm (323) has a receiving space for accommodating the first fixing member (31), and the inner wall of the first elastic arm (323) is provided with a locking hole (3231) for accommodating the locking block (314).

5. The connection structure between the electric toothbrush motor output shaft and the brush head mounting shaft according to claim 1, characterized in that: The first fixing member (31) has a first inclined guide surface (315) on the outer side of the end away from the motor shaft (1), and the second fixing member (32) has a second inclined guide surface (324) on the inner wall of the end away from the brush head mounting handle (2) that abuts against the first inclined guide surface (315).

6. The connection structure between the electric toothbrush motor output shaft and the brush head mounting shaft according to claim 1, characterized in that: The limiting part (322) protrudes from the outer wall of the extension part (321). Two arc-shaped locking grooves (3221) are symmetrically arranged on both sides of the limiting part (322). The main body connector (3) also includes a brush head fixing part (4) connected to the brush head mounting handle (2). The brush head fixing part (4) is provided with two second elastic arms (41). The second elastic arms (41) are provided with arc-shaped locking protrusions (42) that extend into the arc-shaped locking grooves (3221).

7. The connection structure between the electric toothbrush motor output shaft and the brush head mounting shaft according to claim 6, characterized in that: The outer wall of the brush head fixing component (4) is provided with a second limiting groove (43), and the inner wall of the brush head mounting handle (2) near the motor shaft (1) is provided with a limiting rib (21) for extending into the second limiting groove (43). The limiting rib (21) is arranged in a straight strip along the axial direction of the motor shaft (1).

8. The connection structure between the electric toothbrush motor output shaft and the brush head mounting shaft according to claim 1, characterized in that: The connection structure also includes a seal (5), a stop boss (51) is provided on the outside of the seal (5), a stop ring (61) is provided in the mounting cavity of the toothbrush handle housing (6) to stop and abut against the stop boss (51), an elastic ring (52) is provided on the inside of the seal (5), the elastic ring (52) has a hollow portion for the extension (321) of the second fixing member (32) to pass through, a first annular boss (325) is provided on the outer wall of the second fixing member (32), and the free end of the elastic ring (52) is used to abut against the first annular boss (325) to prevent the second fixing member (32) from exiting the mounting cavity of the toothbrush handle housing (6).

9. The connection structure between the electric toothbrush motor output shaft and the brush head mounting shaft according to claim 8, characterized in that: The connection structure also includes a protective cylinder (62) disposed in the mounting cavity of the toothbrush handle housing (6). One end of the protective cylinder (62) is sleeved on the outside of the motor body. The end of the protective cylinder (62) away from the motor body is provided with a second annular boss (621). The stop boss (51) is located between the first annular boss (325) and the stop ring (61).

10. The connection structure between the electric toothbrush motor output shaft and the brush head mounting shaft according to claim 8, characterized in that: The inner wall of the elastic ring (52) is provided with an arc-shaped rib (521), and the outer wall of the second fixing member (32) is provided with an arc-shaped groove (326) for accommodating the arc-shaped rib (521).

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