Electric toothbrush

Abstract

The utility model discloses a kind of electric toothbrush, including the brush handle being set along length direction;Motor is installed in brush handle, it has the connecting shaft being stretched along the length direction of brush handle;Brush head assembly is connected to the one end of brush handle, including brush head and brush head pedestal, brush head pedestal has the first end surface and the second end surface that intersect and present acute angle, two are enclosed to form installation cavity with outer peripheral surface, second end surface is parallel to brush handle axis;Brush hair is set on brush head;Connecting piece is at least partially located in installation cavity, connects electric toothbrush pedestal and brush handle, for the power transmission of connecting shaft to brush head assembly.The utility model technical scheme aims at improving the rigidity and stability of transmission and reducing noise.

Description

Technical Field

[0001] This utility model relates to the field of electric toothbrush technology, and in particular to an electric toothbrush. Background Technology

[0002] Current electric toothbrushes typically employ a vertically mounted brush head structure, with the brush head base end face parallel to the handle axis. This results in poor contact angles between the bristles and the tooth surface, making it particularly difficult to effectively clean the posterior teeth and gingival sulcus area. Power transmission is usually achieved by directly inserting a connecting shaft into a round hole or simple slot at the bottom of the brush head, which is prone to loosening, slippage, or abnormal noise during high-frequency reciprocating or oscillating movements. Utility Model Content

[0003] The main objective of this invention is to provide an electric toothbrush that improves the rigidity and stability of the transmission and reduces noise.

[0004] To achieve the above objectives, this utility model proposes an electric toothbrush, comprising: The brush handle is set along its length. A motor is installed inside the brush handle, and the motor has a connecting shaft extending along the length of the brush handle; A brush head assembly is connected to one end of the brush handle along its length. The brush head assembly includes a brush head and a brush head base. The brush head, the brush head base, and the brush handle are connected in sequence. The brush head base has a first end face, a second end face, and an outer peripheral surface. The first end face, the second end face, and the outer peripheral surface form a mounting cavity. The outer peripheral surface connects the first end face and the second end face. The second end face is parallel to the longitudinal axis of the brush handle. The end of the first end face near the brush head and the end of the second end face near the brush head intersect at an acute angle. Bristles are provided on the brush head; A connector, connected to the brush head base and the brush handle, and at least partially located within the mounting cavity, is used to transmit power from the connecting shaft to the brush head assembly.

[0005] In one embodiment, the brush head base is further provided with a mounting portion, which extends from the first end face toward the brush handle. The connector is provided with a mating portion, and the mounting portion is adapted to be connected with the mating portion so that the connector is detachably connected to the brush head base and can drive the brush head assembly to move synchronously under the drive of the motor.

[0006] In one embodiment, the mounting portion is a positioning seat extending from the first end towards the brush handle; The mating part is a positioning groove corresponding to the positioning seat. After the positioning seat is inserted into the positioning groove, the first end face fits against the connector and restricts the relative rotation of the brush head base relative to the connector.

[0007] In one embodiment, the connector includes a main body portion, which is at least partially housed within the mounting cavity. The main body portion has an open end, a peripheral wall surrounding the open end, and a base plate connected to the other end of the peripheral wall. The peripheral wall has a first mating surface and a second mating surface, the first mating surface being fitted with a first end face, and the second mating surface being fitted with a second end face. The open end is sleeved on the connecting shaft to achieve a transmission connection, and the base plate is connected to the brush head base. Define the distance between the first mating surface and the base plate as L1 along the longitudinal axis of the brush handle, and define the distance between the second mating surface and the base plate as L2; Where L1 is less than L2.

[0008] In one embodiment, the connector further includes a first limiting post, which protrudes from the side of the base plate facing the brush head base; The positioning seat is an annular positioning seat, which is arranged circumferentially around at least part of the mounting cavity, and the annular positioning seat is provided with a limiting port. The first limiting post is inserted into the limiting port to prevent the connector from rotating relative to the brush head base.

[0009] In one embodiment, the connector further includes a second limiting post, and the brush head base is also provided with a first positioning post and a second positioning post spaced apart. The first positioning post and the second positioning post extend from the first end face toward the brush handle and are located inside the annular positioning seat. A limiting space is formed between the first positioning post and the second positioning post, and the second limiting post is accommodated in the limiting space to limit the circumferential displacement of the connector relative to the brush head base.

[0010] In one embodiment, a limiting step is provided at the inner periphery of the brush head base, and a limiting flange protruding outward is provided at the outer periphery of the connector, the limiting flange abutting against the limiting step.

[0011] In one embodiment, the base plate has an installation opening, and the connecting shaft passes through the installation opening and is connected to the connecting member in a transmission manner.

[0012] In one embodiment, the electric toothbrush further includes an anti-detachment component located between the base plate and the brush handle, the connecting shaft passing through the anti-detachment component, and the anti-detachment component being configured to restrict axial displacement of the connecting member along the connecting shaft.

[0013] In one embodiment, the anti-detachment component is an annular boss disposed on the inner wall of the brush handle. The annular boss is arranged around the connecting shaft, one end of the annular boss abuts against the base plate, and the end of the annular boss away from the connecting component is limited and engaged with the inner wall of the brush handle. The electric toothbrush of this invention includes a handle extending along its length, a motor built into the handle (its connecting shaft extending axially along the handle), and a brush head assembly connected to one end of the handle. The brush head assembly consists of a brush head and a brush head base. The brush head base has a first end face, a second end face, and an outer peripheral surface, which together form a mounting cavity for accommodating a connector. The first end face and the second end face intersect at an acute angle near the brush head, thus naturally creating a forward tilt angle of the brush head relative to the handle axis, better conforming to the physiological curvature of the teeth to improve cleaning effectiveness. The connector is partially embedded in the mounting cavity, with one end connected to the motor's connecting shaft and the other end fixedly engaged with the brush head base, reliably transmitting the power output from the motor to the entire brush head assembly, driving the bristles to move. The overall design improves the rigidity and stability of the transmission and reduces noise through structural integration. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 A schematic cross-sectional view of an embodiment of the electric toothbrush provided by this utility model; Figure 2 for Figure 1 A magnified view of a portion of the image; Figure 3 A schematic diagram of a structure of an embodiment of the brush head base provided by this utility model; Figure 4 A schematic diagram of an embodiment of the connector provided by this utility model.

[0016] 10. Brush handle; 20. Motor; 21. Connecting shaft; 30. Brush head assembly; 31. Brush head; 32. Brush head base; 321. First end face; 322. Second end face; 323. Outer peripheral surface; 324. Mounting cavity; 325. Mounting part; 326. Limiting port; 327. First positioning post; 328. Second limiting post; 329. Limiting step; 40. Brush bristles; 50. Connector; 51. Mating part; 52. Main body; 521. Opening end; 522. Peripheral wall; 5221. First mating surface; 5222. Second mating surface; 523. Base plate; 524. Limiting flange; 53. First limiting post; 54. Second limiting post; 60. Anti-detachment component.

[0017] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0019] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0020] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0021] This utility model proposes an electric toothbrush.

[0022] Reference Figures 1-4 In this embodiment of the present invention, an electric toothbrush includes: Brush handle 10 is set along its length; A motor 20 is installed inside the brush handle 10, and the motor 20 has a connecting shaft 21 extending along the length of the brush handle 10. A brush head assembly 30 is connected to one end of the brush handle 10 along its length. The brush head assembly 30 includes a brush head 31 and a brush head base 32. The brush head 31, the brush head base 32, and the brush handle 10 are connected in sequence. The brush head base 32 has a first end face 321, a second end face 322, and an outer peripheral surface 323. The first end face 321, the second end face 322, and the outer peripheral surface 323 enclose a mounting cavity 324. The outer peripheral surface 323 connects the first end face 321 and the second end face 322. The second end face 322 is parallel to the longitudinal axis of the brush handle 10. The end of the first end face 321 near the brush head 31 and the end of the second end face 322 near the brush head 31 intersect at an acute angle. Brush bristles 40 are disposed on the brush head 31; The connector 50 is connected to the brush head base 32 and the brush handle 10, and is at least partially located within the mounting cavity 324, for transmitting power from the connecting shaft 21 to the brush head assembly 30.

[0023] The proposed solution is an electric toothbrush designed to extend along its length, with the handle 10 serving as the main support structure and an integrated drive unit. The motor 20 is installed inside the handle 10, and its output end has a connecting shaft 21 extending along the length of the handle 10 (i.e., the longitudinal axis). This indicates that the electric toothbrush uses axial output power, which can be used to drive the brush head 31 in linear reciprocating motion or rotational oscillation. The brush head assembly 30 is located at one end of the handle 10 along its length and consists of the brush head 31 and the brush head base 32. These three parts are connected sequentially from the brush head 31 to the brush head base 32 to the handle 10, forming a complete power transmission chain. The brush head base 32 includes a first end face 321, a second end face 322, and an outer peripheral surface 323 connecting the two, which together form a closed or semi-closed mounting cavity 324. The second end face 322 is defined as parallel to the longitudinal axis of the brush handle 10. The side of the first end face 321 near the brush head 31 intersects the side of the second end face 322 near the brush head 31 at an acute angle. That is, the brush head base 32 forms an inclined transition surface near the brush head 31, so that the brush head 31 is installed at a certain angle relative to the axis of the brush handle 10. The bristles 40 are disposed on the brush head 31. This preset angle allows the bristles 40 to better conform to the physiological curvature of the teeth, especially when cleaning hard-to-reach areas such as the buccal side, lingual side, and gingival margin of the posterior teeth, significantly improving contact efficiency and cleaning coverage, avoiding the "point contact" or "slippage" phenomenon caused by the brush head 31 being perpendicular to the tooth surface, thereby enhancing the oral care effect. The connector 50, as the medium for power transmission, is connected to the brush head base 32 at one end and the brush handle 10 at the other end, and at least a portion of it is located in the mounting cavity 324. The function of the connector 50 is to reliably transmit the power output from the motor 20 through the connecting shaft 21 to the entire brush head assembly 30, enabling it to produce the expected movement. Simultaneously, the combination of this acute-angled structure and the mounting cavity 324 allows the connector 50 to be partially accommodated inside the brush head base 32, saving external space and forming a wraparound support for the transmission components. This effectively suppresses radial sway or axial movement that may occur when the motor 20 operates at high speed, improving the accuracy and reliability of power transmission. Furthermore, the cavity provides radial or axial constraint to the connector 50, enhancing transmission stability and reducing sway and noise.

[0024] Reference Figures 1-4 The brush head base 32 is also provided with a mounting part 325, which extends from the first end face 321 toward the brush handle 10. The connector 50 is provided with a mating part 51, and the mounting part 325 is adapted to be connected with the mating part 51 so that the connector 50 is detachably connected to the brush head base 32 and can drive the brush head assembly 30 to move synchronously under the drive of the motor 20.

[0025] Furthermore, by mounting part 325 on brush head base 32 and forming a detachable and adaptable connection structure with mating part 51 on connector 50, convenient replacement and stable linkage of brush head assembly 30 are achieved while ensuring reliable power transmission. Specifically, mounting part 325 is designed as a structural feature extending from the first end face 321 of brush head base 32 toward brush handle 10. This layout naturally places it in the inner region of brush head base 32 near the transmission path, neither interfering with the arrangement of bristles 40 nor hindering the power input from motor 20. The mating part 51 on connector 50 matches mounting part 325 in geometry, size, or connection method (such as snap, thread, plug, etc.), forming a mechanical interface that can be repeatedly assembled and disassembled but is firmly connected. On the one hand, it meets the user's hygiene needs for regular replacement of the brush head 31, making the brush head assembly 30 as easy to replace as a traditional manual toothbrush, while retaining the power drive function of an electric toothbrush. On the other hand, since the fitting structure of the mounting part 325 and the mating part 51 is configured to drive the brush head assembly 30 to move synchronously under the drive of the motor 20, this connection not only serves a fixing function but is also a power transmission link. That is, after receiving the movement output from the connecting shaft 21 of the motor 20, the connector 50 transmits the power to the entire brush head assembly 30 through the engagement or nesting of the mating part 51 and the mounting part 325, ensuring that the bristles 40 can work efficiently along the preset trajectory. This design avoids the loosening, slippage, or transmission lag problems common in traditional replaceable brush heads 31, significantly improving the stability of use and the consistency of cleaning. It is understood that the mounting part 325 includes, but is not limited to, an inner hole, a protrusion, or a snap-fit ​​post, and the corresponding mating part 51 includes, but is not limited to, a flange, a shaft, or a sleeve.

[0026] Reference Figures 1-4 The mounting part 325 is a positioning seat that extends from the first end face 321 toward the brush handle 10; The mating part 51 is a positioning groove corresponding to the positioning seat. After the positioning seat is inserted into the positioning groove, the first end face 321 is in contact with the connector 50, and the relative rotation of the brush head base 32 relative to the connector 50 is restricted.

[0027] Furthermore, the mounting portion 325 is defined as a positioning seat extending from the first end face 321 of the brush head base 32 toward the brush handle 10, while the mating portion 51 is defined as a matching positioning groove. The two are connected by the nesting of the positioning seat into the positioning groove. This allows for detachable assembly between the brush head base 32 and the connector 50, and also allows the first end face 321 of the brush head base 32 and the connector 50 to fit tightly together, providing axial limiting and support; and effectively limiting the relative rotation of the brush head base 32 with respect to the connector 50, thereby ensuring that the power output by the motor 20 can be synchronously transmitted to the brush head assembly 30 without slippage or lag. Specifically, the positioning seat can be a columnar, polygonal, or irregularly shaped boss structure (such as a D-shaped column, cross column, spline column, etc.) protruding from the first end face 321 and extending toward the brush handle 10, while the positioning groove is a groove or cavity on the connector 50 that perfectly matches its shape. When the user installs the brush head assembly 30 onto the brush handle 10, the positioning seat inserts into the positioning groove, and the two interlock in the radial and circumferential directions. Once inserted, the brush head base 32 cannot rotate relative to the connector 50 about its axis. Because the brush head 31 of an electric toothbrush typically needs to perform high-frequency reciprocating oscillation or rotational motion, if there is a degree of rotational freedom between the brush head base 32 and the connecting shaft 21, it will lead to power transmission failure, disordered movement of the bristles 40, increased noise, and even component wear. At the same time, after the positioning seat is inserted, it pushes the first end face 321 to fit against the end face of the connector 50, forming a reliable axial stop, preventing the brush head assembly 30 from loosening axially or developing gaps during vibration, thus improving the rigidity and stability of the overall structure.

[0028] Reference Figures 1-4 The connector 50 includes a main body 52, which is at least partially housed within the mounting cavity 324. The main body 52 has an open end 521, a peripheral wall 522 surrounding the open end 521, and a base plate 523 connected to the other end of the peripheral wall 522. The peripheral wall 522 has a first mating surface 5221 and a second mating surface 5222. The first mating surface 5221 fits against the first end face 321, and the second mating surface 5222 fits against the second end face 322. The open end 521 is sleeved on the connecting shaft 21 to achieve a transmission connection. The base plate 523 is connected to the brush head base 32. Define the distance between the first mating surface 5221 and the base plate 523 as L1 along the longitudinal axis of the brush handle 10, and define the distance between the second mating surface 5222 and the base plate 523 as L2; Where L1 is less than L2.

[0029] Specifically, the main body 52 of the connector 50 is constructed as a shell-like structure that is at least partially embedded in the mounting cavity 324 of the brush head base 32. It includes an open end 521, a peripheral wall 522 surrounding the open end 521, and a base plate 523 connecting the other end of the peripheral wall. The overall shape resembles a cup-shaped or cylindrical component with one open end. The open end 521 is fitted onto the connecting shaft 21 of the motor 20, thereby directly receiving rotational or reciprocating motion to achieve power input. The base plate 523 connects the connector 50 and the brush head base 32, bearing the responsibility for force transmission and structural support. The peripheral wall 522 has a first end face 321 and a second end face 322. The first mating surface 5221 fits against the first end face 321 of the brush head base 32, and the second mating surface 5222 fits against the second end face 322. Furthermore, the distance L1 between the first mating surface 5221 and the bottom plate 523 is less than the distance L2 between the second mating surface 5222 and the bottom plate 523. That is, the peripheral wall of the connector 50 is shorter on the side closer to the first end face 321 and longer on the side closer to the second end face 322. This ensures that the connector 50 can achieve full contact and gapless double-sided fit with the two end faces of the brush head base 32 after assembly, forming a stable three-point (or surface) constraint, which greatly improves the connection rigidity and effectively suppresses loosening and abnormal noise under high-frequency vibration. The peripheral wall of the connector 50 corresponds to the inclined shape of the brush head base 32, forming two mating surfaces of different heights, thereby providing rigid support in both axial and radial directions, firmly locking the brush head 31 at the preset angle. No matter how high the motor 20 drives it, the brush head 31 always remains stable. It also optimizes the cutting angle of the bristles 40 to the tooth surface, improving cleaning efficiency.

[0030] Reference Figures 1-4 The connector 50 further includes a first limiting post 53, which protrudes from the base plate 523 on the side facing the brush head base 32. The positioning seat is an annular positioning seat, which is arranged circumferentially around at least part of the mounting cavity 324, and the annular positioning seat is provided with a limiting port 326. The first limiting post 53 is inserted into the limiting port 326 to prevent the connector 50 from rotating relative to the brush head base 32.

[0031] Specifically, this design includes an additional protruding first limiting post 53 on the side of the base plate 523 of the connector 50 facing the brush head base 32, while defining the positioning seat as an annular positioning seat. This annular structure is arranged circumferentially around part or all of the mounting cavity 324, and a limiting opening 326 matching the shape and size of the first limiting post 53 is formed on its annular wall. When the connector 50 is inserted into the brush head base 32, the first limiting post 53 fits precisely into the limiting opening 326. The annular positioning seat is arranged circumferentially around the mounting cavity 324, which not only enhances the local structural strength of the base, but also provides a stable mounting carrier for the limiting opening 326, making the limiting function independent of thin walls or fragile areas, thus improving durability. When installing the brush head assembly 30, the user only needs to align and insert the connector 50, and the first limiting post 53 will slide into the limiting opening 326 without rotation or additional operation; and when disassembling, only axial tension is required to detach it. This design ensures the anti-rotation function while fully retaining the convenience of quick replacement of the electric toothbrush head 31. In addition, since the first limiting post 53 is located on the base plate 523, its force path is short and its rigidity is high, which can effectively withstand the alternating torque output by the motor 20 and avoid failure due to shearing or fatigue.

[0032] Reference Figures 1-4 The connector 50 further includes a second limiting post 54. The brush head base 32 is also provided with a first positioning post 327 and a second positioning post 328 spaced apart. The first positioning post 327 and the second positioning post 328 extend from the first end face 321 toward the brush handle 10 and are located inside the annular positioning seat. A limiting space is formed between the first positioning post 327 and the second positioning post 328. The second limiting post 54 is housed in the limiting space to limit the circumferential displacement of the connector 50 relative to the brush head base 32.

[0033] By setting a second limiting post 54 on the connector 50 and correspondingly configuring a limiting space formed by the first positioning post 327 and the second positioning post 328 on the brush head base 32, the aim is to completely eliminate any slight circumferential movement or torsional gaps that may occur in the electric toothbrush during high-frequency vibration or reciprocating motion, ensuring that the transmission between the brush head assembly 30 and the motor 20 always remains rigidly synchronized. Specifically, the first positioning post 327 and the second positioning post 328 extend from the first end face 321 of the brush head base 32 toward the brush handle 10 and are arranged in the inner area of ​​the annular positioning seat. The two maintain a certain distance in the circumferential direction, together enclosing a closed or semi-closed limiting space; while the second limiting post 54 set on the bottom plate 523 of the connector 50 is precisely embedded in this limiting space during assembly, forming a mechanical fit similar to a protrusion fitting into a groove.

[0034] The additional circumferential constraint boundary is provided by the limiting space formed by the newly added second limiting post 54 and the double positioning posts. Regardless of whether the connector 50 attempts to rotate clockwise or counterclockwise, the second limiting post 54 will immediately contact and be blocked by the first positioning post 327 or the second positioning post 328, significantly improving the structural stability under dynamic conditions. In addition, the first positioning post 327 and the second positioning post 328 are located inside the annular positioning seat, indicating that their layout makes full use of the unused space inside the mounting cavity 324 without increasing the external dimensions of the brush head base 32, reflecting a high degree of spatial integration. At the same time, since these positioning posts also extend from the first end face 321 toward the brush handle 10, their height can match the base plate 523 of the connector 50, ensuring that the second limiting post 54 achieves a gapless fit under axial compression.

[0035] Reference Figures 1-4 The inner wall periphery of the brush head base 32 is provided with a limiting step 329, and the outer periphery of the connector 50 is provided with an outwardly protruding limiting flange 524, which abuts against the limiting step 329.

[0036] Furthermore, a limiting step 329 is provided on the inner periphery of the brush head base 32, and a limiting flange 524 protruding outwards is provided on the outer periphery of the connector 50. The two work together to effectively constrain the displacement of the connector 50 along the longitudinal axis of the brush handle 10 through abutment. The core purpose of this design is to solve the problem of axial loosening of the connector 50 due to inertial force, vibration impact, or assembly tolerance during high-frequency reciprocating or oscillating drive of the electric toothbrush, thereby improving stability. Specifically, the limiting step 329 is an annular inwardly recessed step surface formed on the inner wall of the mounting cavity 324 of the brush head base 32 near the opening end 521, and its side facing the brush head 31 forms a blocking surface perpendicular to the axis; while the limiting flange 524 is a flange structure extending radially outwards on the outer periphery of the main body 52 of the connector 50, and its position corresponds to the limiting step 329 in the axial direction. After the connector 50 is fully inserted into the brush head base 32, the limiting flange 524 abuts against the inner end face of the limiting step 329, forming a reliable axial stop. This fit not only prevents the connector 50 from coming off towards the brush head 31 due to reaction force or vibration under the drive of the motor 20, but also avoids excessive insertion during assembly that could cause interference with the internal structure.

[0037] Reference Figures 1-4 The base plate 523 has an installation opening, and the connecting shaft 21 passes through the installation opening and is connected to the connecting member 50 in a transmission manner.

[0038] The connecting shaft 21 of the motor 20 passes through the mounting port on the base plate 523 of the connector 50, directly achieving transmission coupling with the connector 50. The connecting shaft 21 is not merely sleeved on the outside of the open end 521, but rather runs through the entire connector 50. After entering from the open end 521, it passes through the mounting port on the base plate 523, which is located at the end of the connector 50 furthest from the brush head 31. The mounting port can also serve as a through hole, allowing the connecting shaft 21 to pass through and form a fixed or synchronously rotating connection. During assembly, the connecting shaft 21 can first pass through the mounting port of the base plate 523, and then the entire connector 50 can be pushed into the mounting cavity 324 of the brush head base 32. This allows the alignment of the power shaft and transmission component to be completed internally, unaffected by external housing deformation or assembly deviations, thus improving long-term stability. Furthermore, this through-type structure facilitates disassembly and replacement should future maintenance of the motor 20 be required.

[0039] Reference Figures 1-4 The electric toothbrush also includes an anti-detachment component 60, which is located between the base plate 523 and the brush handle 10. The connecting shaft 21 passes through the anti-detachment component 60, and the anti-detachment component 60 is configured to restrict the axial displacement of the connecting member 50 along the connecting shaft 21.

[0040] Specifically, the anti-detachment component 60 is positioned between the base plate 523 of the connector 50 and the brush handle 10, and the connecting shaft 21 must pass through the anti-detachment component 60. This ensures that the output of the motor 20 is not interfered with, while also providing effective axial constraint on the connector 50. The anti-detachment component 60 includes, but is not limited to: a C-shaped elastic retaining ring, an E-type snap ring, a limiting washer made of plastic or metal, an elastic rubber ring with an inner hole, or even a stop boss integrally formed inside the brush handle 10 (which can be a separate component if it is a detachable design). When the connector 50 is installed in place, one side of its base plate 523 is tightly against the brush head base 32, while the other side is clamped to the brush handle 10 through the anti-detachment component 60. That is, the anti-detachment component 60 abuts against the side of the base plate 523 away from the brush head 31, while the internal structure of the brush handle 10 abuts against the other side of the anti-detachment component 60, thereby firmly locking the connector 50. Even under complex conditions such as high-speed start-stop of motor 20, back pressure of brush head 31 due to oral resistance, or shaking of the user's grip, the connector 50 cannot slide into or out of the brush handle 10 along the connecting shaft 21.

[0041] Reference Figures 1-4 The anti-detachment component 60 is an annular boss disposed on the inner wall of the brush handle 10. The annular boss is disposed around the connecting shaft 21. One end of the annular boss abuts against the base plate 523, and the end of the annular boss away from the connecting component 50 is limited and engaged with the inner wall of the brush handle 10.

[0042] Specifically, the annular boss is circumferentially arranged around the connecting shaft 21 of the motor 20, located inside the brush handle 10 near the brush head assembly 30. Its end face facing the connector 50 directly abuts against the base plate 523 of the connector 50, forming a barrier to the outward movement of the base plate 523 axially (i.e., towards the brush head 31). The other end facing away from the connector 50 forms a stable limiting fit with the inner wall structure of the brush handle 10 itself, ensuring that the annular boss itself will not be displaced or deformed axially. The annular boss is arranged around the entire circumference of the connecting shaft 21, providing a uniform and continuous annular support surface, making the reaction force on the base plate 523 more evenly distributed, effectively preventing warping, wear, or abnormal noise caused by local stress concentration or uneven loading.

[0043] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An electric toothbrush, characterized in that, include: The brush handle is set along its length. A motor is installed inside the brush handle, and the motor has a connecting shaft extending along the length of the brush handle; A brush head assembly is connected to one end of the brush handle along its length. The brush head assembly includes a brush head and a brush head base. The brush head, the brush head base, and the brush handle are connected in sequence. The brush head base has a first end face, a second end face, and an outer peripheral surface. The first end face, the second end face, and the outer peripheral surface form a mounting cavity. The outer peripheral surface connects the first end face and the second end face. The second end face is parallel to the longitudinal axis of the brush handle. The end of the first end face near the brush head and the end of the second end face near the brush head intersect at an acute angle. Bristles are provided on the brush head; A connector, connected to the brush head base and the brush handle, and at least partially located within the mounting cavity, is used to transmit power from the connecting shaft to the brush head assembly.

2. The electric toothbrush according to claim 1, characterized in that, The brush head base is also provided with an installation part, which extends from the first end face towards the brush handle. The connector is provided with a mating part, and the installation part is adapted to be connected with the mating part so that the connector is detachably connected to the brush head base and can drive the brush head assembly to move synchronously under the drive of the motor.

3. The electric toothbrush according to claim 2, characterized in that, The mounting part is a positioning seat that extends from the first end towards the brush handle; The mating part is a positioning groove corresponding to the positioning seat. After the positioning seat is inserted into the positioning groove, the first end face fits against the connector and restricts the relative rotation of the brush head base relative to the connector.

4. The electric toothbrush according to claim 3, characterized in that, The connector includes a main body, which is at least partially housed within the mounting cavity. The main body has an open end, a peripheral wall surrounding the open end, and a base plate connected to the other end of the peripheral wall. The peripheral wall has a first mating surface and a second mating surface. The first mating surface fits against the first end face, and the second mating surface fits against the second end face. The open end is sleeved on the connecting shaft to achieve a transmission connection, and the base plate is connected to the brush head base. Define the distance between the first mating surface and the base plate as L1 along the longitudinal axis of the brush handle, and define the distance between the second mating surface and the base plate as L2; Where L1 is less than L2.

5. The electric toothbrush according to claim 4, characterized in that, The connector also includes a first limiting post, which protrudes from the bottom plate on the side facing the brush head base; The positioning seat is an annular positioning seat, which is arranged circumferentially around at least part of the mounting cavity, and the annular positioning seat is provided with a limiting port. The first limiting post is inserted into the limiting port to prevent the connector from rotating relative to the brush head base.

6. The electric toothbrush according to claim 5, characterized in that, The connector further includes a second limiting post, and the brush head base is also provided with a first positioning post and a second positioning post spaced apart. The first positioning post and the second positioning post extend from the first end face toward the brush handle and are located inside the annular positioning seat. A limiting space is formed between the first positioning post and the second positioning post, and the second limiting post is accommodated in the limiting space to limit the circumferential displacement of the connector relative to the brush head base.

7. The electric toothbrush according to claim 6, characterized in that, The inner periphery of the brush head base is provided with a limiting step, and the outer periphery of the connector is provided with an outwardly protruding limiting flange, which abuts against the limiting step.

8. The electric toothbrush according to claim 4, characterized in that, The base plate has an installation opening, and the connecting shaft passes through the installation opening and is connected to the connecting component in a transmission manner.

9. The electric toothbrush according to claim 4, characterized in that, The electric toothbrush also includes an anti-detachment component located between the base plate and the brush handle, with the connecting shaft passing through the anti-detachment component. The anti-detachment component is configured to limit the axial displacement of the connecting member along the connecting shaft.

10. The electric toothbrush according to claim 9, characterized in that, The anti-detachment component is an annular boss disposed on the inner wall of the brush handle. The annular boss is arranged around the connecting shaft. One end of the annular boss abuts against the base plate, and the end of the annular boss away from the connecting component is matched with the inner wall of the brush handle for limiting.

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