Electric toothbrush

Abstract

The utility model provides an electric toothbrush which comprises a toothbrush head and a handle, a motor assembly, a support and a control circuit board are arranged in the handle, one end of the motor assembly is connected with the toothbrush head, the motor assembly is arranged in the support, the front end of the motor assembly is rotatably connected with the support through a rotating shaft, and the rear end of the motor assembly is connected with the support through a spring. The toothbrush head and the motor assembly can rotate around the rotating shaft relative to the support. A contact is arranged at the rear end of the motor assembly, the control circuit board is located on the side, close to the free end of bristles of the toothbrush head, of the motor assembly, and an inductive switch is arranged at the position, corresponding to the contact, of the control circuit board. When the stress of the toothbrush head exceeds a set value, the contact can trigger the inductive switch.

Description

Technical Field

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

[0002] As electric toothbrushes continue to improve in terms of intelligence and user-friendliness, pressure sensing functions have gradually become a basic feature of electric toothbrushes in order to enable users to use them more scientifically and safely, and to avoid damaging gums due to excessive force during use.

[0003] To achieve pressure sensing, many electric toothbrushes on the market currently mount pressure sensors on the motor shaft, sensing the brush head pressure through slight deformation of the motor. This approach increases the production cost of electric toothbrushes due to the high cost of the pressure sensors themselves, and its complex structure, requiring extremely high precision in the sensor's mounting position, makes it inconvenient for production and assembly. Summary of the Invention

[0004] The purpose of this invention is to provide an electric toothbrush that addresses or at least partially addresses the shortcomings of the aforementioned background technology, simplifies the structure of the electric toothbrush, reduces production costs, and improves the convenience of production and assembly.

[0005] This utility model provides an electric toothbrush, including a toothbrush head and a handle. The handle houses a motor assembly, a bracket, and a control circuit board. One end of the motor assembly is connected to the toothbrush head. The motor assembly is disposed within the bracket. The front end of the motor assembly is rotatably connected to the bracket via a pivot, and the rear end of the motor assembly is connected to the bracket via a spring. The toothbrush head and the motor assembly can rotate relative to the bracket around the pivot. A contact is provided on the rear end of the motor assembly. The control circuit board is located on the side of the motor assembly near the free end of the bristles of the toothbrush head. A sensor switch is provided on the control circuit board corresponding to the contact. When the toothbrush head is subjected to a force exceeding a set value, the contact can trigger the sensor switch.

[0006] In one possible implementation, the direction of extension of the rotating shaft is perpendicular to the direction of extension of the bristles.

[0007] In one possible embodiment, the motor assembly includes a front cover, a drive shaft, a motor, and a rear cover. The front cover is fitted onto the front end of the motor, and the rear cover is fitted onto the rear end of the motor. One end of the drive shaft is connected to the motor, and the other end of the drive shaft extends beyond the handle and is connected to the toothbrush head. The front cover is rotatably connected to the bracket via the pivot, and the rear cover is connected to the bracket via the spring. The contact point is disposed on the rear cover.

[0008] In one possible implementation, a first hemispherical protrusion is provided on the sidewalls of both the left and right sides of the front cover, and the first hemispherical protrusions on the left and right sides of the front cover respectively contact the inner walls of the left and right sides of the front end of the bracket.

[0009] In one possible implementation, a plurality of first hemispherical protrusions are provided on the sidewall of each side of the front cover, and the plurality of first hemispherical protrusions on each side of the front cover are arranged at intervals around the pivot.

[0010] In one possible implementation, the bracket has an abutment portion corresponding to the rear side of the rear cover, and the rear end face of the rear cover has a second hemispherical protrusion that contacts the abutment portion.

[0011] In one possible implementation, the rear end of the back cover is provided with a protrusion, the inner wall of the bracket is provided with a slot, one end of the spring is sleeved on the protrusion, and the other end of the spring is locked in the slot.

[0012] In one possible implementation, the spring includes an integrally connected cylindrical portion and a disc portion, the outer diameter of the disc portion being larger than the outer diameter of the cylindrical portion; the cylindrical portion is sleeved on the protrusion, and the disc portion is engaged in the slot.

[0013] In one possible implementation, the front end of the cylindrical portion is provided with a limiting ring, which is a non-annular structure; the protrusion is a non-cylindrical structure that matches the shape of the limiting ring.

[0014] In one possible implementation, the electric toothbrush further includes a pressure feedback component electrically connected to the control circuit board; the pressure feedback component is used to perform a pressure feedback action after the inductive switch is triggered.

[0015] The electric toothbrush provided by this utility model has its front end of the motor assembly rotatably connected to the bracket via a rotating shaft, and its rear end connected to the bracket via a spring, allowing the toothbrush head and motor assembly to rotate relative to the bracket around the rotating shaft. When the user brushes their teeth, if the pressure on the toothbrush head exceeds a set value, a contact point can trigger a sensor switch, causing the switch to conduct and transmit a feedback signal, thereby reminding the user to reduce the pressure and protect the gums. This electric toothbrush uses a lever-type rotating structure to trigger the sensor switch, thus realizing the pressure sensing function. Its structure is simple, the component cost is low, it simplifies the structure of the electric toothbrush, reduces production costs, and improves the convenience of production and assembly (eliminating the need for high-cost, high-precision, and complex pressure sensors). Attached Figure Description

[0016] Figure 1This is a schematic diagram of the exploded structure of the electric toothbrush in an embodiment of this utility model.

[0017] Figure 2 This is a schematic diagram of the motor assembly in an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the spring structure in an embodiment of this utility model.

[0019] Figure 4 This is a schematic diagram showing the electrical connection relationship between the inductive switch, the pressure feedback component, and the control circuit board in an embodiment of this utility model.

[0020] Figure 5 This is a cross-sectional schematic diagram of the electric toothbrush in an embodiment of this utility model.

[0021] Figure 6 This is a schematic diagram of the structure of the electric toothbrush in this embodiment of the invention after the force on the toothbrush head exceeds a set value. Detailed Implementation

[0022] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0023] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0024] The directional terms such as "up," "down," "left," "right," "front," "back," "top," and "bottom" (if present) used in the specification and claims of this utility model are defined according to the position of the structures in the drawings and the relative positions of the structures, and are only for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed by this utility model.

[0025] like Figures 1 to 6 As shown, the electric toothbrush provided in this embodiment of the present invention has mutually perpendicular front-back, left-right, and up-down directions. The electric toothbrush includes a toothbrush head 1 and a handle 2. The handle 2 is located behind the toothbrush head 1. The toothbrush head 1 is provided with bristles 11 for cleaning the oral cavity. The lower end of the bristles 11 is connected to the toothbrush head 1, and the upper end of the bristles 11 is a free end. The handle 2 is for the user to hold.

[0026] The handle 2 contains a motor assembly 3, a bracket 4, and a control circuit board 5. One end of the motor assembly 3 is connected to the toothbrush head 1 (specifically, the front end of the motor assembly 3 is detachably connected to the toothbrush head 1), and the motor assembly 3 drives the toothbrush head 1 to vibrate. The control circuit board 5 is electrically connected to the motor assembly 3 to control its operation (specifically, the control circuit board 5 has control elements, including chips and control circuits, which control the operation of the motor assembly 3). The bracket 4 is fixedly installed inside the handle 2 and has a hollow structure. The motor assembly 3 is installed inside the bracket 4. The front end of the motor assembly 3 is rotatably connected to the bracket 4 via a rotating shaft 6, and the rear end of the motor assembly 3 is connected to the bracket 4 via a spring 7. The toothbrush head 1 and the motor assembly 3 can rotate relative to the bracket 4 around the rotating shaft 6. The extension direction of the rotating shaft 6 is perpendicular to the extension direction of the bristles 11. Specifically, the bristles 11 extend in the vertical direction, and the rotating shaft 6 extends in the horizontal direction. The rotating shaft 6 serves as a fulcrum, so that the toothbrush head 1 and the motor assembly 3 form a lever structure. When the toothbrush head 1 contacts the teeth or gums and is subjected to downward pressure, the toothbrush head 1 rotates downward around the rotating shaft 6, and the rear end of the motor assembly 3, the rotating shaft 6, rotates upward.

[0027] A contact 341 is provided on the rear end of the motor assembly 3. The control circuit board 5 is located on the side of the motor assembly 3 near the free end of the bristles 11 of the toothbrush head 1 (i.e., the control circuit board 5 is located on the upper side of the motor assembly 3). A sensor switch 51 is provided on the control circuit board 5 corresponding to the contact 341, and the sensor switch 51 is electrically connected to the control circuit board 5. The contact 341 is located on the side of the motor assembly 3 near the control circuit board 5 (i.e., the upper side), and the sensor switch 51 is located on the side of the control circuit board 5 near the motor assembly 3 (i.e., the lower side). When the toothbrush head 1 is subjected to a force exceeding a set value, the contact 341 can trigger the sensor switch 51. The spring 7 can control the force of the toothbrush head 1 and the motor assembly 3 during rotation, that is, control the magnitude of the set force value, and also provide elastic force for the toothbrush head 1 and the motor assembly 3 to return to their original position.

[0028] Specifically, such as Figure 5 As shown, when the toothbrush head 1 is not under pressure (or under very little pressure), the contact 341 and the sensor switch 51 are spaced apart vertically, and the sensor switch 51 is not triggered at this time. Figure 6 As shown, when the toothbrush head 1 is subjected to a downward pressure F, the toothbrush head 1 rotates downward, and the rear end of the motor assembly 3 and the contact 341 rotate upward toward the inductive switch 51. When the force on the toothbrush head 1 exceeds a set value, the contact 341 can contact the inductive switch 51 and press the inductive switch 51, thereby triggering the inductive switch 51. When the toothbrush head 1 is no longer subjected to downward pressure, the toothbrush head 1 and the motor assembly 3 return to their original position under the elastic force of the spring 7 (i.e., from the spring force). Figure 6 Restore to Figure 5 (The state shown).

[0029] The electric toothbrush provided in this embodiment connects the front end of the motor assembly 3 to the bracket 4 via a rotating shaft 6, and the rear end of the motor assembly 3 to the bracket 4 via a spring 7, allowing the toothbrush head 1 and the motor assembly 3 to rotate relative to the bracket 4 around the rotating shaft 6. When the user brushes their teeth, if the force applied to the toothbrush head 1 exceeds a set value, the contact 341 can trigger the induction switch 51, causing the induction switch 51 to conduct and transmit a feedback signal, thereby reminding the user to reduce the pressure applied, achieving the effect of protecting the gums. This electric toothbrush uses a lever-type rotating structure to trigger the induction switch 51, thereby realizing the pressure sensing function. Its structure is simple, the component cost is low, it can simplify the structure of the electric toothbrush, reduce production costs, and improve the convenience of production and assembly (eliminating the need for high-cost, high-precision installation, and complex assembly pressure sensors).

[0030] In one implementation, the inductive switch 51 is a micro switch. Of course, in other embodiments, the inductive switch 51 can also be other switch types.

[0031] As one implementation method, the motor assembly 3 is suspended inside the bracket 4 (that is, the motor assembly 3 is not connected to the bracket 4 except for the front and rear ends which are connected to the bracket 4 by the rotating shaft 6 and the spring 7 respectively, so that the motor assembly 3 is suspended inside the bracket 4). This can reduce the transmission of high-frequency vibration generated by the motor assembly 3 during operation to the bracket 4 and the handle 2, thereby reducing the noise generated by the collision between the motor assembly 3 and the bracket 4 and the vibration of the handle 2, and improving the user experience.

[0032] like Figures 1 to 6 As shown, in one embodiment, the motor assembly 3 includes a front cover 31, a drive shaft 32, a motor 33, and a rear cover 34. The front cover 31 is sleeved and fixed to the front end of the motor 33, and the rear cover 34 is sleeved and fixed to the rear end of the motor 33. One end of the drive shaft 32 is connected to the motor 33, and the other end of the drive shaft 32 extends out of the handle 2 and is connected to the toothbrush head 1 (specifically, the drive shaft 32 and the toothbrush head 1 are detachably connected by plugging). The motor 33 can be a vibration motor or a sonic motor, and the motor 33 drives the toothbrush head 1 to vibrate (generally, it drives the toothbrush head 1 to vibrate left and right) through the drive shaft 32. The control circuit board 5 is electrically connected to the motor 33 to control the operation of the motor 33. The front cover 31 is rotatably connected to the bracket 4 through a rotating shaft 6, and the rear cover 34 is connected to the bracket 4 through a spring 7; a contact 341 is provided on the rear cover 34, and the contact 341 is a protruding structure on the rear cover 34, and the contact 341 and the rear cover 34 are an integral structure.

[0033] Specifically, the bracket 4 includes a top cover 4B and a bottom shell 4A arranged vertically. The top cover 4B is located above the bottom shell 4A, and the top cover 4B and the bottom shell 4A are fixed by snap-fit. A receiving cavity 40 is formed between the top cover 4B and the bottom shell 4A. The front cover 31, the motor 33, and the rear cover 34 are all located in the receiving cavity 40. One end of the drive shaft 32 is located in the receiving cavity 40 and connected to the motor 33. The other end of the drive shaft 32 extends out of the bracket 4 and is connected to the toothbrush head 1. The left and right side walls of the front cover 31 are provided with first shaft holes 312, and the left and right side walls of the front end of the bottom shell 4A are provided with second shaft holes 44. There are two rotating shafts 6. The two rotating shafts 6 are respectively inserted into the first shaft holes 312 and the second shaft holes 44 on the left and right sides to realize the rotational connection between the front cover 31 and the bottom shell 4A, thereby realizing the rotational connection between the motor assembly 3 and the bracket 4.

[0034] like Figures 1 to 6 As shown, in one embodiment, the left and right sidewalls of the front cover 31 are provided with first hemispherical protrusions 311. The first hemispherical protrusions 311 and the front cover 31 are integrally formed. The first hemispherical protrusions 311 on the left and right sides of the front cover 31 respectively contact the inner walls of the left and right sides of the front end of the bracket 4. Specifically, the first hemispherical protrusions 311 on the left and right sides of the front cover 31 respectively contact the inner walls of the left and right sides of the front end of the bottom shell 4A (i.e., Figure 1 The front cover 31 is in contact with the inner wall of the bracket 4 at position C. By setting the first hemispherical protrusion 311, the front cover 31 forms a point contact with the inner wall of the bracket 4 through the first hemispherical protrusion 311, reducing the contact area between the front cover 31 and the inner wall of the bracket 4, thereby reducing the transmission of high-frequency vibration generated by the motor assembly 3 during operation to the bracket 4 and the handle 2, and at the same time enabling the front cover 31 to rotate more smoothly relative to the bracket 4 (i.e., reducing rotational resistance). As one embodiment, a plurality of first hemispherical protrusions 311 are provided on each side wall of the front cover 31, and the plurality of first hemispherical protrusions 311 on each side of the front cover 31 are spaced apart around the rotating shaft 6 (that is, spaced apart around the first shaft hole 312). In this embodiment, four first hemispherical protrusions 311 are provided on each side wall of the front cover 31, and the four first hemispherical protrusions 311 on each side of the front cover 31 are evenly spaced around the rotating shaft 6. By setting multiple first hemispherical protrusions 311, the front cover 31 can be provided with more stable support (i.e., the front cover 31 is limited to the left and right).

[0035] like Figures 1 to 6As shown, in one embodiment, the bracket 4 has an abutment portion 41 located on the rear side of the rear cover 34. The abutment portion 41 is specifically disposed on the bottom shell 4A and is an integral structure with the bottom shell 4A. The abutment portion 41 is located behind the rear cover 34. A second hemispherical protrusion 342 is provided on the rear end face of the rear cover 34. The second hemispherical protrusion 342 is an integral structure with the rear cover 34 and contacts the abutment portion 41. The purpose of providing the abutment portion 41 is to position the rear cover 34 in the front-rear direction. By providing the second hemispherical protrusion 342, the rear cover 34 forms a point contact with the abutment portion 41 through the second hemispherical protrusion 342, reducing the contact area between the rear cover 34 and the abutment portion 41. This reduces the transmission of high-frequency vibrations generated by the motor assembly 3 during operation to the bracket 4 and the handle 2, and at the same time allows the rear cover 34 to rotate more smoothly relative to the bracket 4 (i.e., reducing rotational resistance). In this embodiment, the rear cover 34 has a second hemispherical protrusion 342 on both the left and right sides of the rear end face, and an abutment portion 41 on both the left and right sides of the rear cover 34. The second hemispherical protrusion 342 on the left and right sides respectively contacts the abutment portion 41 on the left and right sides.

[0036] like Figures 1 to 6 As shown, in one embodiment, the rear end of the back cover 34 is provided with a protrusion 343, the protrusion 343 and the back cover 34 are an integral structure, the inner wall of the bracket 4 is provided with a slot 42, the slot 42 is located behind the back cover 34, one end of the spring 7 is sleeved on the protrusion 343, and the other end of the spring 7 is locked in the slot 42, thereby realizing the connection between the spring 7 and the back cover 34 and the bracket 4.

[0037] Specifically, in this embodiment, a partition 45 is provided on the bottom shell 4A behind the rear cover 34, and a slot 42 is provided on the partition 45 near the rear cover 34. At the same time, a protrusion 451 is also provided on the partition 45. The rear end of the spring 7 is locked in the slot 42, and the upper side of the rear end of the spring 7 abuts against the protrusion 451, thereby preventing the spring 7 from moving upward and coming out of the slot 42 when the motor assembly 3 rotates.

[0038] In this embodiment, the spring 7 includes an integrally connected cylindrical portion 71 and a disc portion 72. The cylindrical portion 71 has a cylindrical structure, and the disc portion 72 has a disc-shaped structure. The outer diameter of the disc portion 72 is larger than that of the cylindrical portion 71. The cylindrical portion 71 is sleeved on the protrusion 343, and the disc portion 72 is engaged in the slot 42, with its upper side abutting against the protrusion 451. By providing the disc portion 72, which has a larger area and higher structural strength, the connection between the disc portion 72 and the bracket 4 can be increased. This not only improves the connection stability between the spring 7 and the bracket 4, but also provides higher elasticity, thus providing a more stable elasticity for the reset of the toothbrush head 1 and the motor assembly 3. Furthermore, the disc portion 72 is less prone to deformation and failure after long-term use. This type of spring 7 can be manufactured using a special winding method.

[0039] In this embodiment, a limiting ring 711 is provided at the front end of the cylindrical portion 71. The limiting ring 711 and the cylindrical portion 71 are an integral structure. The limiting ring 711 is a non-circular structure (i.e., the outermost ring of the spring 7 is a non-circular structure). The protrusion 343 is a non-cylindrical structure that matches the shape of the limiting ring 711. In this embodiment, the limiting ring 711 is a D-shaped structure, and the protrusion 343 is a D-shaped structure that matches the shape of the limiting ring 711. This design can prevent mistakes and ensure the accuracy and product consistency after the spring 7 is assembled onto the back cover 34.

[0040] As one implementation, the front cover 31 and the rear cover 34 can be made of materials such as POM (polyoxymethylene) or PA (polyamide), which have good structural strength and wear resistance.

[0041] like Figures 1 to 6 As shown, in one embodiment, the handle 2 is further provided with a sealing ring 24, which is located at the front opening of the handle 2, and the drive shaft 32 passes through the sealing ring 24; the front end of the bracket 4 is sleeved with the sealing ring 24, and the front end of the bracket 4 abuts against the sealing ring 24. The sealing ring 24 is used to seal the front opening of the handle 2.

[0042] like Figures 1 to 6 As shown, in one embodiment, the handle 2 has a receiving hole 21. Inside the receiving hole 21, from top to bottom, are a switch button 22 and a button seal 23. The button seal 23 is made of TPE soft rubber and is used to seal the receiving hole 21. A control switch 52 is provided on the control circuit board 5 at the position corresponding to the switch button 22. The control switch 52 is electrically connected to the control circuit board 5. The switch button 22 is used by the user to press and activate the control switch 52, thereby controlling the control circuit board 5 to open and close the motor 33 or switch its operating mode (e.g., change the vibration frequency of the motor 33).

[0043] like Figures 1 to 6 As shown, in one embodiment, the control circuit board 5 is disposed on the outer wall of the bracket 4. A clearance hole 43 is provided on the bracket 4 corresponding to the position of the inductive switch 51. The inductive switch 51 is located within the clearance hole 43, allowing the contact 341 to contact the inductive switch 51 and trigger it. Specifically, the control circuit board 5 is disposed on the upper surface of the top cover 4B, the inductive switch 51 is disposed on the lower surface of the control circuit board 5, and the clearance hole 43 is disposed on the top cover 4B.

[0044] like Figures 1 to 6 As shown, in one embodiment, the electric toothbrush also includes a pressure feedback component 8, which is electrically connected to the control circuit board 5. The pressure feedback component 8 is used to perform a pressure feedback action after the induction switch 51 is triggered. The pressure feedback component 8 can be a voice prompt device (e.g., a buzzer, speaker, etc.), which can be mounted on the control circuit board 5. The pressure feedback component 8 can also be a light-emitting device, such as a light-emitting ring mounted on the outside of the handle 2. When the induction switch 51 is triggered, the control circuit board 5 controls the voice prompt device to provide audio prompts or controls the light-emitting device to illuminate. Simultaneously, the control circuit board 5 controls the motor 33 to increase its vibration frequency, thereby reminding the user to reduce the pressure applied, thus protecting the gums.

[0045] As one implementation, the assembly steps of the electric toothbrush are as follows: assemble the front cover 31, motor 33 and rear cover 34 together (drive shaft 32 and motor 33 are pre-assembled together), then assemble the spring 7 on the rear cover 34, then assemble the motor assembly 3 into the bracket 4 through the rotating shaft 6, and at the same time install the spring 7 into the bracket 4; then install the control circuit board 5 onto the outer wall of the bracket 4, and finally assemble the bracket 4 into the handle 2.

[0046] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An electric toothbrush, comprising a toothbrush head and a handle, wherein the handle houses a motor assembly, a bracket, and a control circuit board, one end of the motor assembly being connected to the toothbrush head, characterized in that, The motor assembly is housed within the bracket. The front end of the motor assembly is rotatably connected to the bracket via a pivot, and the rear end of the motor assembly is connected to the bracket via a spring. The toothbrush head and the motor assembly are capable of rotating relative to the bracket around the pivot. A contact is provided on the rear end of the motor assembly. The control circuit board is located on the side of the motor assembly near the free end of the bristles of the toothbrush head. A sensor switch is provided on the control circuit board at the position corresponding to the contact. When the force on the toothbrush head exceeds a set value, the contact can trigger the sensor switch.

2. The electric toothbrush as described in claim 1, characterized in that, The extension direction of the rotating shaft is perpendicular to the extension direction of the brush bristles.

3. The electric toothbrush as described in claim 1, characterized in that, The motor assembly includes a front cover, a drive shaft, a motor, and a rear cover. The front cover is fitted onto the front end of the motor, and the rear cover is fitted onto the rear end of the motor. One end of the drive shaft is connected to the motor, and the other end of the drive shaft extends out of the handle and is connected to the toothbrush head. The front cover is rotatably connected to the bracket via the pivot, and the rear cover is connected to the bracket via the spring. The contact point is disposed on the rear cover.

4. The electric toothbrush as described in claim 3, characterized in that, The left and right sides of the front cover are provided with first hemispherical protrusions, and the first hemispherical protrusions on the left and right sides of the front cover are respectively in contact with the inner walls of the left and right sides of the front end of the bracket.

5. The electric toothbrush as described in claim 4, characterized in that, Each side wall of the front cover is provided with a plurality of first hemispherical protrusions, and the plurality of first hemispherical protrusions on each side of the front cover are arranged at intervals around the pivot.

6. The electric toothbrush as described in claim 3, characterized in that, The bracket is provided with an abutment portion corresponding to the rear side of the rear cover, and the rear end face of the rear cover is provided with a second hemispherical protrusion, which contacts the abutment portion.

7. The electric toothbrush as described in claim 3, characterized in that, The rear end of the back cover is provided with a protruding post, and the inner wall of the bracket is provided with a slot. One end of the spring is sleeved on the protruding post, and the other end of the spring is locked in the slot.

8. The electric toothbrush as described in claim 7, characterized in that, The spring includes an integrally connected cylindrical part and a disc part, the outer diameter of the disc part being larger than the outer diameter of the cylindrical part; the cylindrical part is sleeved on the protrusion, and the disc part is engaged in the slot.

9. The electric toothbrush as described in claim 8, characterized in that, The front end of the cylindrical part is provided with a limiting ring, which is a non-circular structure; the protruding post is a non-cylindrical structure that matches the shape of the limiting ring.

10. The electric toothbrush as described in any one of claims 1-9, characterized in that, The electric toothbrush also includes a pressure feedback component, which is electrically connected to the control circuit board; the pressure feedback component is used to perform a pressure feedback action after the induction switch is triggered.

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