Electric toothbrush and its driving device

Abstract

This utility model belongs to the field of electric toothbrush technology, specifically relating to an electric toothbrush and its driving device. The driving device includes: a driver; a transmission base with a transmission groove, a driving wheel on the bottom wall of the transmission groove, and the output shaft of the driver connected to the transmission base; and a driven wheel disposed in the transmission groove, the side wall of the transmission groove having a gear groove adapted to the driven wheel, the driven wheel meshing with the driving wheel and the gear groove respectively, and the driven wheel coaxially connected to the transmission shaft. The electric toothbrush includes a body, a toothbrush head, a pressure cap, a power supply, and a driving device; the body has a power supply and control device, and the driving device is disposed within the body; the pressure cap is fitted around the outer periphery of the transmission shaft and connected to the body; one end of the toothbrush head is connected to the transmission shaft, and the other end is connected to and snapped into the body. This solves the problems of unstable transmission, high noise, and poor teeth cleaning effect encountered during the use of electric toothbrushes.

Description

Technical Field

[0001] This utility model belongs to the field of electric toothbrush technology, specifically relating to a driving device for an electric toothbrush and an electric toothbrush using the driving device. Background Technology

[0002] After prolonged use, electric toothbrushes experience decreased and unstable transmission efficiency, resulting in significant vibration and noise. This can not only wear down tooth enamel but also cause gum recession and loose teeth. The noise, especially noticeable in quiet environments, can easily cause user anxiety. Furthermore, current electric toothbrushes primarily offer fast, medium, and slow brushing modes, which are insufficient for effectively cleaning wedge-shaped teeth or other irregular dentition.

[0003] To address the aforementioned shortcomings, the structure of current electric toothbrushes needs to be optimized and improved to resolve issues such as unstable transmission, excessive noise, and poor cleaning effectiveness encountered during use. Utility Model Content

[0004] The purpose of this invention is to provide an electric toothbrush and its driving device to solve the problems of unstable transmission, loud noise, and poor teeth cleaning effect encountered by existing electric toothbrushes during use.

[0005] To achieve the above objectives, this utility model provides a driving device for an electric toothbrush, comprising:

[0006] drive;

[0007] A transmission base has a circular cross-sectional shape. A transmission groove is provided within the transmission base, and a drive wheel is mounted on the bottom wall of the transmission groove. The axis of the drive wheel is coaxial with the axis of the transmission base. The output shaft of the driver is connected to the transmission base.

[0008] A driven wheel is disposed in the transmission groove. The side wall of the transmission groove is provided with a gear groove adapted to the driven wheel. The driven wheel meshes with the driving wheel and the gear groove respectively, and the driven wheel is coaxially connected to the transmission shaft.

[0009] In one possible design, the drive wheel has a mounting hole, and the output shaft of the driver is inserted into the mounting hole and keyed to the drive wheel.

[0010] In one possible design, both the driving wheel and the driven wheel are configured as spur gears.

[0011] In one possible design, the driving wheel has teeth that mesh with the driven wheel only in a portion of its area, and the sidewall of the transmission groove has gear grooves only in a portion of its area, in order to constrain the range of motion of the driven wheel.

[0012] An electric toothbrush includes a body, a toothbrush head, a pressure cap, a power supply, and the aforementioned driving device; the body is provided with a power supply and a control device, the driving device is disposed in the body, electrically connected to the power supply, and communicatively connected to the control device; the pressure cap is sleeved on the outer periphery of the drive shaft and connected to the body; one end of the toothbrush head is connected to the drive shaft, and the other end is snapped into the body.

[0013] In one possible design, the toothbrush head includes a housing, a positioning shaft, bristle holders, and a locking element. The housing has a mounting groove, and the portion of the positioning shaft extending into the mounting groove forms a crankshaft. Multiple bristle holders are arranged along the length of the positioning shaft and locked onto the crankshaft. Each bristle holder has multiple sets of bristles. The housing has a locking hole that mates with the locking element, and the bristle holders have through holes. The locking element passes through the locking hole and the through hole to lock the bristle holders onto the housing.

[0014] In one possible design, a reinforcement is provided in the area below the mounting groove, and the reinforcement is integrally injection molded with the housing.

[0015] In one possible design, the mounting surface of the bristle holder is configured as a folded surface, and the folded surfaces of adjacent bristle holders have different inclination directions.

[0016] In one possible design, the gland is provided with an annular locking platform and an annular stop platform, and the inner wall of the housing is provided with a locking groove that mates with the locking platform and a step that mates with the stop platform, wherein the stop platform is located on the side closer to the drive device.

[0017] In one possible design, the electric toothbrush further includes a base and a drive cylinder; the drive shaft has a cut surface, and the positioning shaft has a mating surface; the base is sleeved above the drive shaft, and the base has a limiting groove that matches the cut surface, with the drive shaft inserted into the limiting groove; the drive cylinder is fixedly sleeved on the outer periphery of the base, and the drive cylinder has a stop groove that mates with the mating surface, with the positioning shaft inserted into the stop groove; when the driver rotates, the drive shaft drives the base to rotate, and the drive cylinder drives the positioning shaft to rotate.

[0018] The electric toothbrush also includes a helical spring disposed in the housing of the toothbrush head. One end of the helical spring is sleeved on the outer periphery of the transmission cylinder and the positioning shaft. One end of the helical spring abuts against the transmission cylinder, and the other end abuts against the housing of the toothbrush head.

[0019] The above technical solution provides a power source through a driver. The transmission seat is fixedly connected to the output shaft of the driver, thus receiving the power transmitted by the driver. Because the transmission seat has an eccentric shaft, nonlinear motion can be generated. The eccentric shaft is fixedly connected to the positioning seat, so by rotating it to generate eccentric motion, the positioning seat can produce periodic displacement. The sector gear on the outside of the positioning seat meshes with the fixed gear, receiving the rotational motion from the sector gear and transmitting it to the transmission shaft, thereby converting the motion of the eccentric shaft into rotational motion. Since the transmission shaft is coaxially connected to the output shaft of the gear, the rotational motion can ultimately be transmitted to the toothbrush head, realizing the toothbrush head's specific motion mode (such as vibration, oscillation, etc.).

[0020] The design of the eccentric shaft and sector gears effectively transforms the rotational motion of the drive into complex motion patterns, improving cleaning performance. Simultaneously, the drive can be precisely controlled in terms of speed and torque via a control device, ensuring stable and predictable brush head movement. By adjusting the gear ratio and the position of the eccentric shaft, different motion modes (such as vibration, oscillation, and rotation) can be achieved to meet the cleaning needs of different users. This provides an efficient and comfortable oral cleaning experience, suitable for everyday home use. It is also suitable for dental clinics or professional care facilities, assisting healthcare professionals in performing more precise dental cleanings. The entire drive unit has a compact structure, suitable for installation within the miniaturized housing of an electric toothbrush, ensuring product portability and aesthetics, and offering good practicality.

[0021] Using the above technical solution, users select the working mode and start the electric toothbrush via buttons or a touchscreen on the control device. The control device sends commands to the drive unit, and the drive unit begins to operate. The rotational motion generated by the drive unit is transmitted to the drive shaft through the transmission seat, eccentric shaft, positioning seat, sector gear, and gear, ultimately transmitting the rotational motion to the toothbrush head. By adjusting the position of the eccentric shaft and the gear ratio, various motion modes (such as vibration, oscillation, rotation, etc.) can be achieved, thereby providing a more comprehensive cleaning effect. Attached Figure Description

[0022] 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 these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural diagram of the electric toothbrush provided by this utility model in one embodiment;

[0024] Figure 2 This is a cross-sectional view of an embodiment of the electric toothbrush provided by this utility model;

[0025] Figure 3 yes Figure 2 A magnified structural diagram of part A in the middle;

[0026] Figure 4 yes Figure 2 A magnified structural diagram of part B in the middle section;

[0027] Figure 5 This is a three-dimensional structural schematic diagram of the driving device for the electric toothbrush provided by this utility model in one embodiment;

[0028] Figure 6 yes Figure 5 A magnified structural diagram of section C.

[0029] In the above figures: 1-body, 2-toothbrush head, 21-housing, 211-locking hole, 22-positioning shaft, 221-crankshaft, 23-brush bristle holder, 231-through hole, 24-reinforcing body, 3-pressure cap, 41-cylinder seat, 42-transmission cylinder, 5-drive device, 51-driver, 52-transmission seat, 521-transmission groove, 53-drive wheel, 54-driven wheel, 55-transmission shaft, 551-section, 6-power supply. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that while the description of these embodiments is intended to aid in understanding the present invention, it does not constitute a limitation thereof. The specific structural and functional details disclosed herein are only for describing exemplary embodiments of the present invention. However, the present invention may be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0031] According to a first aspect of this utility model, a driving device for an electric toothbrush is provided. Wherein, Figures 1 to 6 One specific embodiment is shown.

[0032] See Figures 1 to 6As shown, the driving device of the electric toothbrush includes: a driver 51; a transmission base 52 with a circular cross-sectional shape, a transmission groove 521 in the transmission base 52, a driving wheel 53 on the bottom wall of the transmission groove 521, the axis of the driving wheel 53 being coaxially arranged with the axis of the transmission base 52, and the output shaft of the driver 51 being connected to the transmission base 52; and a driven wheel 54 disposed in the transmission groove 521, the side wall of the transmission groove 521 being provided with a gear groove adapted to the driven wheel 54, the driven wheel 54 meshing with the driving wheel 53 and the gear groove respectively, and the driven wheel 54 being coaxially connected to the transmission shaft 55.

[0033] The driver 51 is activated by the control device, generating rotational motion. The output shaft of the driver 51 transmits power to the transmission seat, causing the drive wheel 53 to rotate synchronously. The drive wheel 53 (similar to a sun gear) meshes with the driven wheel 54 (similar to a planetary gear), while the driven wheel 54 also meshes with the gear groove (similar to a planet carrier) on the side wall of the transmission groove 521, transmitting rotational motion to the driven wheel 54. The output shaft of the driven wheel 54 is coaxially connected to the transmission shaft 55, transmitting rotational motion to the toothbrush head 2 to achieve specific motion modes (such as vibration, oscillation, rotation, etc.).

[0034] The above technical solution forms a planetary gear system, ensuring efficient power transmission and reducing kinetic energy loss. The circular cross-section and compact gear arrangement of the transmission seat 52 make the entire drive unit 5 more compact, saving space and facilitating integration into the body 1 of the electric toothbrush. The precise coordination of the components in the planetary gear system helps reduce vibration and noise during operation, providing a quieter and more comfortable user experience. Through the multiple meshing of the driving gear 53, driven gear 54, and gear slots, various motion modes (such as vibration, oscillation, rotation, etc.) can be achieved to meet the cleaning needs of different users, improve cleaning effect, and provide a more comfortable user experience.

[0035] In this disclosure, the drive wheel 53 has a mounting hole, and the output shaft of the driver 51 is inserted into the mounting hole and keyed to the drive wheel 53. This ensures a tight fit between the output shaft of the driver 51 and the drive wheel 53, reducing slippage and energy loss, and improving power transmission efficiency. The axis lines of the drive wheel 53 and the driven wheel 54 are coaxial with the axis line of the transmission seat 52, making the entire drive unit 5 more compact, saving space, and facilitating integration into the body 1 of the electric toothbrush. The connections between the components are simple and clear, facilitating disassembly and maintenance.

[0036] In one embodiment, both the driving gear 53 and the driven gear 54 are configured as spur gears. The simple tooth profile and stable transmission performance of spur gears ensure efficient power transmission, thereby reducing kinetic energy loss. Simultaneously, due to the simple tooth profile and tight meshing of spur gears, vibration and noise during operation are reduced. Furthermore, the design of spur gears makes the assembly between the driving gear 53 and the driven gear 54 simpler and easier to disassemble and maintain.

[0037] In one embodiment provided in this disclosure, the driving wheel 53 has teeth that mesh with the driven wheel 54 in only a portion of its area, and the sidewall of the transmission groove 521 has gear grooves in only a portion of its area, in order to constrain the range of motion of the driven wheel 54.

[0038] Specifically, the driver 51 is activated by the control device, generating rotational motion. The output shaft of the driver 51 is fixed in the mounting hole of the drive wheel 53 via a key connection, transmitting the rotational motion to the drive wheel 53. The drive wheel 53 has teeth only in a portion of its area, which mesh with the driven wheel 54, causing the driven wheel 54 to oscillate or reciprocate within a specific range. The transmission groove 521 has gear grooves only in a portion of its sidewall, further constraining the range of motion of the driven wheel 54 and ensuring its stable operation within a specific angle. The output shaft of the driven wheel 54 is coaxially connected to the transmission shaft 55, transmitting the oscillating or reciprocating motion to the toothbrush head 2 to achieve specific cleaning modes (such as oscillation, vibration, etc.).

[0039] By incorporating teeth on the drive wheel 53 and gear grooves on the sidewall of the transmission groove 521, the driven wheel 54 can oscillate or reciprocate within a specific range, achieving diverse cleaning modes (such as oscillation and vibration) and improving cleaning effectiveness. The design of teeth and gear grooves in certain areas allows for precise control of the driven wheel 54's range of motion, preventing excessive rotation and ensuring the effectiveness and safety of the cleaning action. Simultaneously, this precise control of the driven wheel 54's range of motion reduces unnecessary vibration and noise, providing a quieter and more comfortable user experience.

[0040] According to a second aspect of this disclosure, an electric toothbrush is provided. Figures 1 to 6 One specific implementation is shown.

[0041] See Figures 1 to 6 As shown, the electric toothbrush includes a body 1, a toothbrush head 2, a pressure cap 3, a power supply 6, and a drive device 5 in the first aspect; the body 1 is provided with a power supply 6 and a control device, the drive device 5 is disposed in the body 1, and is electrically connected to the power supply 6 and communicatively connected to the control device; the pressure cap 3 is sleeved on the outer periphery of the drive shaft 55 and connected to the body 1; one end of the toothbrush head 2 is connected to the drive shaft 55, and the other end is snapped into the body 1.

[0042] Specifically, the body 1 serves as the main outer shell of the entire electric toothbrush, housing internal components such as the power supply 6, control device, and drive unit 5. It typically employs a waterproof design to ensure normal operation in humid environments. One end of the toothbrush head 2 is connected to the drive shaft 55 of the drive unit 5, while the other end is snapped into the body 1, ensuring stability and replaceability. A pressure cap 3 is fitted around the drive shaft 55 and connected to the body 1, serving a fixing and protective function, preventing external contaminants from entering the drive shaft 55 area, and providing additional mechanical support to ensure stable operation of the drive shaft 55. The power supply 6 is located inside the body 1, supplying power to the entire system. This power supply 6 is designed as a rechargeable battery for convenient daily use. The control device is located inside the body 1 or on the surface of the casing, used to control the operating state of the drive unit 51 (such as start, stop, mode adjustment, etc.). It communicates with the drive unit 5 via a circuit board, enabling precise control of the drive unit 51. The drive unit 5, located inside the body 1, converts electrical energy into mechanical motion, driving the toothbrush head 2 to perform specific motion modes (such as vibration, oscillation, rotation, etc.). The power supply 6 is directly connected to the drive unit 5 via a wire, providing it with a stable power supply.

[0043] Using the above technical solution, the user selects the working mode and starts the electric toothbrush via buttons or a touchscreen on the control device. The control device sends a command to the drive unit 5, and the driver 51 begins to work. The rotational motion generated by the driver 51 is transmitted to the drive shaft 55 through the transmission seat 52, eccentric shaft, positioning seat, sector gear, and gear, and finally to the toothbrush head 2. By adjusting the position of the eccentric shaft and the gear ratio, various motion modes (such as vibration, oscillation, rotation, etc.) can be achieved, thereby providing a more comprehensive cleaning effect.

[0044] In one embodiment of this disclosure, the toothbrush head 2 includes a housing 21, a positioning shaft 22, a bristle holder 23, and a locking member. The housing 21 has a mounting groove. The portion of the positioning shaft 22 extending into the mounting groove forms a crankshaft 221. Multiple bristle holders 23 are arranged along the length of the positioning shaft 22 and secured to the crankshaft 221. Multiple sets of bristles are provided on each bristle holder 23. Based on the design of the crankshaft 221, not only is the connection strength between the bristle holder 23 and the positioning shaft 22 enhanced, but the crankshaft 221 structure also provides a more flexible movement pattern, ensuring that the bristles can better adapt to different surfaces and angles of the teeth. The housing 21 has a locking hole 211 that cooperates with the locking member, and the bristle holder 23 has a through hole 231. The locking member passes through the locking hole 211 and the through hole 231 to lock the bristle holder 23 onto the housing 21.

[0045] Among them, crankshaft 221 is formed as a connecting shaft with an "arch"-shaped structure (see Figure 3As shown in the diagram, this design allows the brush holder to be fixed in place, thereby causing it to swing in different directions. Furthermore, T-shaped, L-shaped, or spherical stops can be installed at the bottom and top of the crankshaft to better engage or lock with the brush holder, thereby promoting accurate movement of the brush holder, reducing shaking and noise, and improving cleaning efficiency and quality.

[0046] In other embodiments, the crankshaft 221 can also be configured as a connecting shaft extending in a straight line, with T-shaped, L-shaped, or spherical irregularly shaped stop blocks spaced apart along the axial direction of the connecting shaft. The stop blocks can be staggered. In this way, the adjacent bristle holders 23 can be oscillated back and forth in different directions by the stop blocks crossing each other.

[0047] Alternatively, the crankshaft could be configured with any other suitable structure to securely support the brush holder, which also falls within the scope of the technical concept of this case.

[0048] The housing 21 serves as the outer shell of the toothbrush head 2 and has an internal mounting groove that accommodates the positioning shaft 22 and the bristle holder 23, ensuring the accurate positioning of the bristle holder 23. The positioning shaft 22 extends into the mounting groove, helping to fix the position of the bristle holder 23, ensuring that the bristle holder 23 is correctly positioned along its length and maintaining accurate assembly. Each bristle holder 23 has multiple sets of bristles, providing cleaning effects for different areas. A through hole 231 is provided on the bristle holder 23, through which a locking member passes to lock the bristle holder 23. The locking member engages with a locking hole 211 on the housing 21, passing through both the locking hole 211 and the through hole 231 on the bristle holder 23. This securely locks the bristle holder 23 onto the housing 21, ensuring that the bristle holder 23 will not loosen or fall off.

[0049] In this disclosure, when replacement is needed, simply loosen the locking mechanism, remove the old bristle holder 23, and install the new bristle holder 23. Based on the replaceable bristle holder 23, different bristle holders 23 can be selected as needed, thereby extending the lifespan of the toothbrush head 2. Each bristle holder 23 has multiple sets of bristles, providing personalized cleaning effects for different tooth areas, such as gum massage and tooth cleaning. The design of the locking mechanism and locking hole 211 ensures that the bristle holder 23 will not loosen or fall off during use, providing a stable cleaning experience.

[0050] In one embodiment provided in this disclosure, a reinforcing body 24 is provided in the area below the mounting groove. The reinforcing body 24 is integrally injection molded with the housing 21, which eliminates potential weaknesses at the joints and improves the overall structural strength and durability. Simultaneously, because the reinforcing body 24 is located in the area below the mounting groove, it provides additional mechanical support, preventing the housing 21 from deforming or being damaged under stress. The presence of the reinforcing body 24 makes the entire toothbrush head 2 more robust, able to withstand greater impact and wear, and extends the product's service life.

[0051] It is worth mentioning that the housing 21 and the reinforcement 24 are made of high-strength, wear-resistant and waterproof materials (such as ABS plastic) to ensure long-term reliability and durability.

[0052] The positioning shaft 22 is made of stainless steel or other corrosion-resistant materials to ensure that it will not rust during long-term use.

[0053] In one embodiment provided in this disclosure, the mounting surface of the bristle holder 23 is configured as a folded surface, and the folded surfaces of adjacent bristle holders 23 have different inclination directions. The folded surface configuration of the mounting surface of the bristle holder 23 allows the bristles of each bristle holder 23 to face different directions. The different inclination directions of the folded surfaces of adjacent bristle holders 23 can form a multi-angle bristle layout, thereby providing diverse cleaning angles to adapt to different surfaces and angles of the teeth, enabling better cleaning of all surfaces and gaps of the teeth. Simultaneously, different inclination angles can adapt to different tooth shapes and arrangements, allowing the bristles to reach all corners of the teeth, improving cleaning efficiency, reducing blind spots, and providing a more personalized cleaning effect.

[0054] During assembly, users can select different types of brush holders 23 as needed and snap them onto the positioning shaft 22 one by one, ensuring that the folded surface of each brush holder 23 is tilted in the correct direction. The brush holder 23 is securely locked to the housing 21 by a locking member passing through the locking hole 211 on the housing 21 and the through hole 231 on the brush holder 23. In daily use, the brush holder 23 can provide diverse cleaning effects; when replacement is needed, simply loosen the locking member, remove the old brush holder 23, and install the new brush holder 23.

[0055] In one embodiment provided in this disclosure, the pressure cap 3 is provided with an annular retaining platform and an annular stop platform. The inner wall of the housing 21 is provided with a retaining groove that mates with the retaining platform and a step that mates with the stop platform, wherein the stop platform is located on the side closer to the drive device 5. The pressure cap 3 is fitted onto the outer periphery of the drive shaft 55, and its retaining platform is aligned with the retaining groove inside the housing 21. It is then gently pressed in until the stop platform contacts the step inside the housing 21. To ensure that the pressure cap 3 is fully engaged, its secure installation can be confirmed by slight rotation or tapping.

[0056] The engagement of the locking platform and slot ensures a tight connection between the gland 3 and the housing 21, preventing loosening or detachment. The design of the locking platform and stop provides a double seal, ensuring internal components are protected from external contaminants. The engagement of the stop and step prevents the gland 3 from being excessively pressed into the housing 21, providing additional mechanical support and enhancing overall stability. The quick-release mechanism of the locking platform and slot simplifies the assembly process and improves production efficiency.

[0057] In one embodiment provided in this disclosure, the electric toothbrush further includes a tube base 41 and a transmission tube 42; the transmission shaft 55 is provided with a cut surface 551, and the positioning shaft 22 is provided with a mating surface; the tube base 41 is sleeved above the transmission shaft 55, and the tube base 41 is provided with a limiting groove that matches the cut surface 551, and the transmission shaft 55 is inserted into the limiting groove; the transmission tube 42 is fixedly sleeved on the outer periphery of the tube base 41, and the transmission tube 42 is provided with a stop groove that matches the mating surface, and the positioning shaft 22 is inserted into the stop groove; when the driver 51 rotates, the transmission shaft 55 drives the tube base 41 to rotate, and the transmission tube 42 drives the positioning shaft 22 to rotate.

[0058] The drive shaft 55 has a cut surface 551, which engages with a limiting groove in the cylinder seat 41 to ensure a tight connection between the drive shaft 55 and the cylinder seat 41. The positioning shaft 22 has a mating surface, which engages with a stop groove in the drive cylinder 42 to ensure a tight connection between the positioning shaft 22 and the drive cylinder 42. It is sleeved above the drive shaft 55 and has a limiting groove inside that matches the cut surface 551 of the drive shaft 55.

[0059] The cut surface 551 mates with the limiting groove to ensure a tight connection between the drive shaft 55 and the cylinder seat 41, enabling them to rotate synchronously. The mating surface mates with the stop groove to ensure a tight connection between the positioning shaft 22 and the drive cylinder 42, enabling them to rotate synchronously. Through the multi-stage connection of the drive shaft 55, cylinder seat 41, drive cylinder 42, and positioning shaft 22, the stability and reliability of the entire transmission system are ensured. The precise fit between the cut surface 551 and the limiting groove, and between the mating surface and the stop groove, reduces friction between components and extends service life. The quick-fitting of the limiting groove and the stop groove simplifies the assembly process and improves production efficiency. The design of the drive cylinder 42 and cylinder seat 41 provides additional mechanical support and sealing performance, preventing external contaminants from entering the transmission system.

[0060] When the drive shaft 55 rotates, the cylinder seat 41 also rotates. The drive cylinder 42 is fixedly sleeved on the outer circumference of the cylinder seat 41 and has a stop groove inside that mates with the mating surface of the positioning shaft 22. When the cylinder seat 41 rotates, the drive cylinder 42 drives the positioning shaft 22 to rotate together. The driver 51 is installed in the machine body 1, electrically connected to the power supply 6, and communicatively connected to the control device. It converts electrical energy into mechanical motion, driving the drive shaft 55 to perform specific motion modes (such as vibration, oscillation, rotation, etc.).

[0061] The user activates the driver 51 via a control device, causing the driver 51 to rotate. This rotational motion is transmitted to the toothbrush head 41 via a drive shaft 55. The cut surface 551 on the drive shaft 55 engages with a limiting groove within the toothbrush head 41, ensuring synchronized rotation. The toothbrush head 41 rotates together with the drive shaft 55. The drive cylinder 42 is fixedly fitted around the outer circumference of the toothbrush head 41, and its stop groove engages with the contact surface on the positioning shaft 22, ensuring that the drive cylinder 42 drives the positioning shaft 22 to rotate together. The rotation of the positioning shaft 22 is transmitted to the toothbrush head 2 via the bristle holder 23, enabling specific movement modes (such as vibration, oscillation, rotation, etc.) of the toothbrush head 2.

[0062] The drive shaft 55 and the positioning shaft 22 are made of high-strength, wear-resistant and corrosion-resistant materials (such as stainless steel or aluminum alloy) to ensure long-term reliability and durability.

[0063] The cylinder base 41 and the transmission cylinder 42 are made of high-strength, wear-resistant and waterproof materials (such as ABS plastic or engineering plastic) to ensure long-term reliability and durability.

[0064] Furthermore, the electric toothbrush also includes a helical spring disposed in the housing of the toothbrush head. One end of the helical spring is sleeved on the outer periphery of the transmission cylinder and the positioning shaft. One end of the helical spring abuts against the transmission cylinder, and the other end abuts against the housing of the toothbrush head. In addition to the drive device and related components, it also includes a helical spring disposed in the housing of the toothbrush head.

[0065] The spring force of the coil spring allows the drive cylinder to press firmly against the base, thus stabilizing the toothbrush head's movement through the spring's cushioning and support, optimizing cleaning performance, especially when cleaning uneven areas of the teeth. This provides cushioning and support for the drive system, enhancing the toothbrush head's stability, particularly at high speeds, allowing it to respond quickly to changes in user pressure and providing a more flexible and comfortable cleaning experience.

[0066] Specifically, the control device is equipped with a microcontroller.

[0067] In addition, the control device can also be configured as a PLC logic control device or a central processing unit (CPU). In other embodiments, the control device can also be configured as a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or a field-programmable gate array (FPGA).

[0068] Finally, it should be noted that this utility model is not limited to the above-described optional embodiments, and anyone can derive other various forms of products under the guidance of this utility model. The above specific embodiments should not be construed as limiting the scope of protection of this utility model, which should be determined by the claims, and the description can be used to interpret the claims.

Claims

1. A drive device of an electric toothbrush, characterized by comprising: include: drive; A transmission base has a circular cross-sectional shape. A transmission groove is provided within the transmission base, and a drive wheel is mounted on the bottom wall of the transmission groove. The axis of the drive wheel is coaxial with the axis of the transmission base. The output shaft of the driver is connected to the transmission base. A driven wheel is disposed in the transmission groove. The side wall of the transmission groove is provided with a gear groove adapted to the driven wheel. The driven wheel meshes with the driving wheel and the gear groove respectively, and the driven wheel is coaxially connected to the transmission shaft.

2. The driving device for the electric toothbrush according to claim 1, characterized in that, The drive wheel is provided with a mounting hole, and the output shaft of the driver is inserted into the mounting hole and keyed to the drive wheel.

3. The driving device for the electric toothbrush according to claim 1, characterized in that, Both the driving wheel and the driven wheel are equipped with spur gears.

4. The driving device for the electric toothbrush according to claim 1, characterized in that, The driving wheel has teeth that mesh with the driven wheel only in a portion of its area, and the sidewall of the transmission groove has gear grooves only in a portion of its area, in order to constrain the range of motion of the driven wheel.

5. An electric toothbrush, characterized in that, The device includes a body, a toothbrush head, a pressure cap, a power supply, and a driving device as described in any one of claims 1 to 4; the body is provided with a power supply and a control device, the driving device is disposed in the body, electrically connected to the power supply, and communicatively connected to the control device; the pressure cap is sleeved on the outer periphery of the drive shaft and connected to the body; one end of the toothbrush head is connected to the drive shaft, and the other end is snapped into the body.

6. The electric toothbrush according to claim 5, characterized in that, The toothbrush head includes a housing, a positioning shaft, bristle holders, and a locking element. The housing has a mounting groove, and the portion of the positioning shaft extending into the mounting groove forms a crankshaft. Multiple bristle holders are arranged along the length of the positioning shaft and locked onto the crankshaft. Each bristle holder has multiple sets of bristles. The housing has a locking hole that mates with the locking element, and the bristle holders have through holes. The locking element passes through the locking hole and the through hole to lock the bristle holders onto the housing.

7. The electric toothbrush according to claim 6, characterized in that, A reinforcing body is provided in the area below the mounting groove, and the reinforcing body is integrally injection molded with the shell.

8. The electric toothbrush according to claim 6, characterized in that, The mounting surface of the bristle holder is configured as a folded surface, and the folded surfaces of adjacent bristle holders have different inclination directions.

9. The electric toothbrush according to claim 6, characterized in that, The pressure cap is provided with an annular locking platform and an annular stop platform. The inner wall of the housing is provided with a locking groove that mates with the locking platform and a step that mates with the stop platform. The stop platform is located on the side closer to the driving device.

10. The electric toothbrush according to claim 6, characterized in that, The electric toothbrush also includes a base and a transmission cylinder; the transmission shaft has a cut surface, and the positioning shaft has a mating surface; the base is sleeved above the transmission shaft, and the base has a limiting groove that matches the cut surface, and the transmission shaft is inserted into the limiting groove; the transmission cylinder is fixedly sleeved on the outer periphery of the base, and the transmission cylinder has a stop groove that matches the mating surface, and the positioning shaft is inserted into the stop groove; when the driver rotates, the transmission shaft drives the base to rotate, and the transmission cylinder drives the positioning shaft to rotate; The electric toothbrush also includes a helical spring disposed in the housing of the toothbrush head. One end of the helical spring is sleeved on the outer periphery of the transmission cylinder and the positioning shaft. One end of the helical spring abuts against the transmission cylinder, and the other end abuts against the housing of the toothbrush head.

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