A brush head structure of an electric toothbrush

Abstract

This application belongs to the field of electric toothbrushes and relates to an electric toothbrush head structure, including a brush head housing and a transmission component installed inside the brush head housing. The transmission component is fixed and encapsulated by an inner housing, which is formed by an inner upper cover and an inner lower cover that fit together. The top of the inner lower cover is equipped with an elastic buckle-type anti-dislodgement buckle, and its bottom edge is designed with positioning points. The inner wall of the inner upper cover has multiple semi-cylindrical shaft positions opened along the axial direction. After the inner upper cover and the inner lower cover are fitted together, they form a cavity for positioning shafts. The technical solution provided by this application can provide an electric toothbrush head design with quick assembly, stable operation, precise transmission, and error prevention functions.

Description

Technical Field

[0001] This application relates to the field of electric toothbrush technology, and more specifically, to an electric toothbrush head structure. Background Technology

[0002] With increasing public awareness of oral health, electric toothbrushes have gradually become a widely used cleaning tool in daily life. Electric toothbrushes use a motor inside the handle to drive the brush head, cleaning teeth through high-frequency vibration or rotation. The structure of the brush head is a key component for achieving power transmission and cleaning effect, and its rationality directly determines the product's cleaning performance, noise level, and lifespan. However, there are still some problems with the current electric toothbrush head structure in the production and use process.

[0003] The inner core and outer shell of existing brush heads are usually assembled using processes such as screw fixing, glue bonding or ultrasonic welding. This not only increases the investment in production equipment and the complexity of manufacturing processes, but also limits the automation efficiency of products in large-scale production, and is not conducive to the subsequent classification, recycling and environmental treatment of materials.

[0004] When the motor is driven at high frequency, if there is a gap between the inner core of the brush head and the outer shell, it is easy to cause longitudinal or radial shaking. This will not only lead to the waste of vibration energy and the reduction of cleaning effect, but may also generate annoying operating noise, or even cause components to loosen or slip.

[0005] In current brush head drive systems, the drive shaft often lacks sufficient support points. When rotating at high speed or vibrating, the drive shaft and driven shaft may wobble due to radial displacement, which not only aggravates the wear of transmission components such as gears, but also significantly reduces the accuracy of brush head oscillation.

[0006] When replacing the brush head, users need to control a specific angle when connecting the brush head to the handle's drive shaft. If there is a lack of clear and accurate guidance and positioning design, users may force the installation at the wrong angle, thereby damaging the transmission connection and even causing permanent damage to the handle's drive shaft. Summary of the Invention

[0007] The purpose of this invention is to provide an electric toothbrush head design that features rapid assembly, stable operation, precise transmission, and error prevention.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: an electric toothbrush head structure, including a brush head housing and a transmission component installed inside the brush head housing, wherein the transmission component is fixed and encapsulated by an inner housing, and the inner housing is formed by an inner housing upper cover and an inner housing lower cover through mutual engagement; The top of the inner shell lower cover is equipped with an anti-disengagement buckle in the form of an elastic buckle, and its bottom edge is designed with positioning points; The inner wall of the upper inner shell has multiple semi-cylindrical shaft positions opened along the axial direction. The upper inner shell and the lower inner shell are assembled to form a cavity for positioning shaft.

[0009] As a further description of the above technical solution: the transmission assembly includes a drive shaft, a driven shaft, a transmission gear, a docking plug, and a docking transmission component.

[0010] As a further description of the above technical solution: the top ends of the drive shaft and the driven shaft are respectively connected to brush heads, and the bottom end of the drive shaft is equipped with a docking plug, which is inserted into the inner cavity of the docking transmission component to achieve connection.

[0011] As a further description of the above technical solution: the two transmission gears are respectively mounted on the driving shaft and the driven shaft, and mesh with each other.

[0012] As a further description of the above technical solution: the diameter of the cavity of the positioning shaft matches the outer diameter of the driving shaft and the driven shaft, providing multiple support points for the shaft system.

[0013] As a further description of the above technical solution: the bottom of the inner cavity of the inner shell is provided with a docking tube position, the inner diameter of the docking tube position is larger than the inner diameter of the shaft tube position, and is used to accommodate the docking transmission component.

[0014] As a further description of the above technical solution: the anti-disengagement buckle is connected to the positioning hole of the brush head housing by an elastic snap-fit ​​method; The anti-disengagement buckle is an outwardly protruding elastic structure. After the inner shell is inserted into the brush head shell to a predetermined depth, the anti-disengagement buckle will spring into the corresponding limiting through hole on the inner wall of the brush head shell.

[0015] As a further description of the above technical solution: after the anti-disengagement buckle is engaged in the limiting through hole, it provides axial locking force and eliminates the longitudinal gap between the inner shell and the brush head shell.

[0016] As a further description of the above technical solution: the positioning point is set inside the slot of the assembled brush head structure, and its function is to guide the brush head structure to be inserted at a specific angle, thereby realizing the coupling of the docking transmission component and the handle power shaft.

[0017] As a further description of the above technical solution: the inside of the driving shaft and the driven shaft are respectively provided with reinforcing steel wires coaxially along the axial direction.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. By adopting a design in which the upper and lower inner shell covers interlock, tool-free installation of the brush head shaft structure is achieved. It can be automatically locked simply by pushing it in, which greatly reduces the complexity of assembly and effectively improves production efficiency.

[0019] 2. The anti-disengagement mechanism provides excellent axial locking force, effectively preventing the transmission components from slipping in high-frequency vibration environments; in addition, by eliminating the longitudinal gap between the inner housing and the brush head housing, not only is shaking and noise caused by the gap avoided, but the stability and efficiency of the brush head amplitude transmission are also ensured.

[0020] 3. The inner housing is designed with multiple shaft tube positions, and the cavity of the positioning shaft is matched with the outer diameter of the transmission shaft. After the structure is closed, it provides multiple support for the shaft system, thereby effectively limiting the radial displacement and runout of the drive shaft and driven shaft during high-speed movement.

[0021] 4. The brush head slot is designed with precise positioning points to guide the user to insert the brush head in the correct direction, ensuring that the transmission components and the handle drive shaft are precisely aligned, thereby avoiding the risk of damage to the transmission components due to incorrect installation angle. Attached Figure Description

[0022] Figure 1 A perspective view of the present invention is shown; Figure 2 The present invention is shown. Figure 1 A diagram from another perspective; Figure 3 A cross-sectional view of the present invention is shown; Figure 4 A schematic diagram of the inner shell cover and the docking transmission component of the present invention is shown; Figure 5 A schematic diagram of the upper inner shell cover and the lower inner shell cover of the present invention is shown; Figure 6 A perspective view of the driving shaft and driven shaft of the present invention is shown; Figure 7 A perspective view of the shaft tube position and the docking part tube position of the present invention is shown; Figure 8 A perspective view of the anti-disengagement mechanism of the present invention is shown.

[0023] Legend: 10. Brush head housing; 11. Inner shell upper cover; 12. Inner shell lower cover; 13. Drive shaft; 14. Driven shaft; 15. Transmission gear; 16. Connecting plug; 17. Connecting transmission component; 18. Brush head; 19. Shaft tube position; 20. Connecting component tube position; 21. Positioning point; 22. Anti-disengagement buckle. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figures 1-8 The present invention provides a technical solution: an electric toothbrush head structure, including a brush head housing 10 and a transmission component installed inside the brush head housing 10.

[0026] The transmission assembly is fixedly encapsulated by an inner shell, which is composed of an inner shell upper cover 11 and an inner shell lower cover 12 that fit together.

[0027] To prevent the installation from coming loose, the top of the inner shell lower cover 12 is designed with an elastic buckle-type anti-dislodgement buckle 22, and its bottom edge is provided with a positioning point 21.

[0028] Positioning point 21 is located inside the assembled brush head structure slot, which can guide the user to insert the brush head structure in the correct direction, effectively avoiding damage to the transmission components due to incorrect angle. Specifically, positioning point 21 ensures that the brush head structure can only be fully inserted and firmly fixed in a specific direction, thereby ensuring that the docking transmission component 17 can be precisely coupled with the power shaft of the handle.

[0029] The anti-disengagement buckle 22 on the top of the inner shell lower cover 12 is connected to the slot on the inner wall of the brush head housing 10 in an elastic snap-fit ​​manner, thereby securing the inner shell and its internal transmission components as a whole within the brush head housing 10. Through this design, tool-free and modular rapid assembly of the brush head shaft structure is achieved.

[0030] Specifically, the anti-disengagement buckle 22 is designed as an outwardly protruding elastic structure. During the assembly process, when the inner housing (including the transmission component) is inserted into the brush head housing 10, the anti-disengagement buckle 22 will undergo slight elastic deformation due to pressure. When the inner housing enters the predetermined depth, the anti-disengagement buckle 22 will then spring back and precisely engage in the corresponding limiting through hole on the inner wall of the brush head housing 10.

[0031] Once the anti-disengagement buckle 22 is engaged, it provides a strong axial locking force, effectively preventing the transmission shaft and inner housing from slipping or popping out of the brush head housing 10 during high-frequency vibration or daily cleaning of the electric toothbrush. Through the ingenious design of this elastic buckle, the assembly of the components does not require the use of adhesives, screws, or ultrasonic welding. It can be automatically locked simply by pushing it in, thereby significantly improving installation efficiency. At the same time, the engagement of the anti-disengagement buckle 22 eliminates the longitudinal gap between the inner housing and the brush head housing 10, avoiding noise or shaking of the transmission components during high-speed operation caused by the gap, and further ensuring that the amplitude transmission of the brush head structure is more stable and efficient.

[0032] The transmission components inside the brush head structure are the core of realizing the function of the brush head structure. They include a drive shaft 13, a driven shaft 14, a transmission gear 15, a docking plug 16, and a docking transmission component 17.

[0033] The top ends of the drive shaft 13 and the driven shaft 14 are connected to the brush head 18 respectively. The bottom end of the drive shaft 13 is provided with a docking plug 16, which is inserted into the inner cavity of the docking transmission component 17 and tightly connected. At the same time, the drive shaft 13 and the driven shaft 14 realize the transmission and distribution of power through the meshing transmission gear 15.

[0034] Two transmission gears 15 are mounted on the drive shaft 13 and the driven shaft 14, maintaining the same horizontal height and always meshing. When the electric toothbrush handle drives the docking transmission component 17 to rotate as a power source, the power is transmitted to the drive shaft 13 through the docking plug 16, and then precisely transmitted to the driven shaft 14 through the meshing transmission gears 15, thereby driving the two brush heads 18 to operate synchronously.

[0035] To further improve the fatigue life of the brush head structure under high-speed alternating loads, both the drive shaft 13 and the driven shaft 14 are wrapped with reinforcing steel wires. These reinforcing steel wires can significantly enhance the bending strength and toughness of the shaft, effectively preventing fatigue fracture of the shaft due to excessive force or high-frequency alternating stress during use.

[0036] To ensure the stability of the shaft system under high-speed rotation, the inner shell structure is precisely designed, and its inner wall has a limiting function.

[0037] The inner wall of the inner shell cover 11 has multiple semi-cylindrical shaft tube positions 19 opened along the axial direction. When the two parts of the cover are closed together, these semi-cylindrical shaft tube positions 19 are combined to form a complete positioning shaft chamber. The diameter of the chamber matches the outer diameter of the drive shaft 13 and the driven shaft 14, providing multiple support points for the drive shaft 13 and the driven shaft 14, effectively limiting their radial displacement and avoiding swaying during high-speed movement.

[0038] The diameter of the shaft tube 19 is clearance-fitted with the outer diameters of the drive shaft 13 and the driven shaft 14. It is recommended that the clearance be between 0.02mm and 0.05mm.

[0039] In addition, the docking tube 20 at the bottom of the inner shell is designed to be slightly larger than the inner diameter of the shaft tube 19, so as to securely accommodate the docking transmission component 17 and ensure that it does not loosen or shift when the toothbrush handle is frequently inserted and removed.

[0040] During use, the power transmission path of the transmission component is as follows: the power shaft of the toothbrush handle is connected to the docking transmission component 17. To ensure the stability of torque transmission, the inner hole of the docking transmission component 17 can be designed as a non-circular structure, such as a D-shaped hole or a spline hole; the docking plug 16 is firmly connected to the docking transmission component 17 through an interference fit, thereby transmitting power to the drive shaft 13; transmission gears 15 are fixedly installed on the drive shaft 13 and the driven shaft 14 respectively. These transmission gears are preferably made of high-strength and low-friction engineering plastics, such as POM or nylon; the module and number of teeth of the two gears are completely consistent to ensure 1:1 constant speed synchronous transmission, thereby ensuring that the amplitude and frequency of the two brush heads 18 are completely symmetrical.

[0041] To further improve the service life and safety performance of the brush head, it is recommended that the inner shell be made of food-grade PP or ABS material to ensure excellent dimensional stability and safety. At the interface where the drive shaft 13 and driven shaft 14 pass through, a soft rubber sealing ring (not shown in the figure) can be added to effectively prevent toothpaste foam and water from entering the inner shell cavity, thereby avoiding the impact on gear lubrication performance. Food-grade silicone grease can be pre-coated on the contact surface between the transmission gear 15 and the shaft tube 19, which will help to further reduce the noise generated during operation.

[0042] This electric toothbrush head structure is suitable for various electric toothbrush handles, and its usage method is as follows: The user inserts the docking transmission component 17 at the bottom of the brush head structure into the toothbrush handle, and the motor output shaft is precisely coupled with the docking transmission component 17.

[0043] The motor rotates and drives the docking transmission component 17 and its connected drive shaft 13. The power is transmitted to the driven shaft 14 through the transmission gear 15, so that the drive shaft 13 and the driven shaft 14 together drive the brush head 18 to perform tooth cleaning in a high-frequency synchronous motion.

[0044] With its snap-fit ​​inner shell encapsulation structure, it not only significantly improves assembly efficiency during the manufacturing process, but also facilitates subsequent disassembly and material recycling.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An electric toothbrush head structure, characterized in that: Includes a brush head housing (10) and a transmission assembly installed inside the brush head housing (10). The transmission assembly is fixed and encapsulated by an inner housing. The inner housing is formed by an inner housing upper cover (11) and an inner housing lower cover (12) that are fitted together. The top of the inner shell lower cover (12) is equipped with an anti-disengagement buckle (22) in the form of an elastic buckle, and its bottom edge is designed with positioning points (21). The inner wall of the upper inner shell cover (11) has multiple semi-cylindrical shaft tubes (19) opened along the axial direction. The upper inner shell cover (11) and the lower inner shell cover (12) are fastened together to form a cavity for positioning shaft.

2. The electric toothbrush head structure according to claim 1, wherein: The transmission assembly includes a drive shaft (13), a driven shaft (14), a transmission gear (15), a docking plug (16), and a docking transmission component (17).

3. The electric toothbrush brush head structure according to claim 2, characterized in that: The top ends of the drive shaft (13) and driven shaft (14) are respectively connected to brush heads (18), and the bottom end of the drive shaft (13) is provided with a docking plug (16). The docking plug (16) is inserted into the inner cavity of the docking transmission component (17) and connected.

4. The electric toothbrush brush head structure according to claim 3, characterized in that: The two transmission gears (15) are respectively mounted on the drive shaft (13) and the driven shaft (14) and mesh with each other.

5. The electric toothbrush brush head structure according to claim 4, characterized in that: The diameter of the cavity of the positioning shaft matches the outer diameter of the driving shaft (13) and the driven shaft (14), providing multiple support points for the shaft system.

6. The electric toothbrush brush head structure according to claim 5, characterized in that: The bottom of the inner cavity of the inner shell is provided with a docking tube position (20), the inner diameter of which is larger than the inner diameter of the shaft tube position (19), and is used to accommodate the docking transmission component (17).

7. The electric toothbrush brush head structure according to claim 1, characterized in that: The anti-disengagement buckle (22) is connected to the positioning hole of the brush head housing (10) by an elastic snap-fit ​​method; The anti-disengagement buckle (22) is an outwardly protruding elastic structure. After the inner shell is inserted into the brush head shell (10) to a predetermined depth, the anti-disengagement buckle (22) will spring into the corresponding limiting through hole on the inner wall of the brush head shell (10).

8. The electric toothbrush brush head structure according to claim 7, characterized in that: After the anti-disengagement buckle (22) is engaged in the limiting through hole, it provides axial locking force and eliminates the longitudinal gap between the inner shell and the brush head shell (10).

9. The electric toothbrush head structure according to claim 6, characterized in that: The positioning point (21) is set inside the slot of the assembled brush head structure. Its function is to guide the brush head structure to be inserted at a specific angle, thereby realizing the coupling of the connecting transmission component (17) and the handle power shaft.

10. The electric toothbrush head structure according to claim 2, characterized in that: The drive shaft (13) and driven shaft (14) are respectively provided with reinforcing steel wires coaxially along the axial direction inside.

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