Small-diameter electric toothbrush

Abstract

The utility model discloses a small-diameter electric toothbrush, which comprises a motor, a toothbrush head, a toothbrush head, a toothbrush head, a toothbrush head, a toothbrush head and a toothbrush head, the motor comprises a neodymium-iron-boron magnet, the diameter of the motor is smaller than or equal to 16mm, and the locked-rotor torque of the motor is larger than 40g. Cm; the transmission assembly comprises a first end part and a second end part which are opposite to each other, the first end part is in transmission connection with the motor, and the motor is used for driving the first end part to drive the second end part to rotate; the brush head assembly is connected to the second end part, and the second end part is used for driving the brush head assembly to swing. According to the small-diameter electric toothbrush, the neodymium iron boron magnet is used in the motor, so that the magnetism of the magnet in the motor is enhanced, and under the condition that the diameter of the motor is smaller than or equal to 16 mm, the motor can output the locked-rotor torque of 40 g.cm. And the small-diameter electric toothbrush using the motor can reduce the diameter of the electric toothbrush while the cleaning capacity is not reduced, so that the use comfort is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric toothbrushes, in particular to an electric toothbrush with a small diameter. Background Art

[0002] Traditional manual toothbrushes rely on the user's hand movements to brush teeth, which requires the user to have the correct brushing technique and sufficient patience to ensure comprehensive and effective removal of food debris and dental plaque on the tooth surface and between teeth. However, due to improper brushing methods or lack of continuous and meticulous cleaning by some users, tooth and gum problems such as tooth decay, dental calculus and periodontal disease often occur.

[0003] With the development of technology, electric toothbrushes came into being, aiming to improve the effect of brushing teeth and reduce the physical burden on users. The original electric toothbrush design was relatively simple, usually including a fixed brush head or a rotating head with a small amount of bristles, which was driven by a battery to rotate or vibrate to clean teeth. Because electric toothbrushes need to have sufficient power to have sufficient cleaning power, large-sized drive parts are used in the prior art to enhance the power. This results in the overall size of the electric toothbrush being larger, which reduces the comfort of the user's grip. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a small-diameter electric toothbrush, which reduces the diameter of the motor and thus reduces the size of the entire small-diameter electric toothbrush. Neodymium iron boron magnets are used to enhance the power output of the motor, ensuring sufficient cleaning power while improving the comfort of use.

[0005] The utility model provides a small-diameter electric toothbrush, comprising:

[0006] A motor, the motor comprising a neodymium iron boron magnet, the diameter of the motor being less than or equal to 16 mm, and the stall torque of the motor being greater than 40 g·cm;

[0007] A transmission assembly, the transmission assembly comprising a first end and a second end opposite to each other, the first end being in transmission connection with the motor, the motor being used to drive the first end to drive the second end to rotate;

[0008] A brush head assembly is connected to the second end portion, and the second end portion is used to drive the brush head assembly to swing.

[0009] In one embodiment, the motor includes a plurality of coils.

[0010] In one embodiment, the small-diameter electric toothbrush also includes a brush handle, the brush handle is provided with a receiving cavity, the receiving cavity is used to install the motor and the transmission assembly, the brush head assembly is rotatably connected to the brush handle, and the diameter of the brush handle is less than or equal to 27 mm.

[0011] In one embodiment, the small-diameter electric toothbrush further comprises a power source, and the power source comprises a lithium battery.

[0012] In one embodiment, the small-diameter electric toothbrush also includes a wireless charging coil, which is installed in the accommodating cavity and arranged on a side of the power source away from the brush head assembly, and is used to charge the power source.

[0013] In one embodiment, the transmission assembly includes an output shaft, a transmission shaft and a connecting piece. The output shaft is transmission-connected to the motor, the motor is used to drive the output shaft to rotate, the transmission shaft is connected to the end of the output shaft, the axis of the transmission shaft is parallel to the axis of the output shaft, the output shaft is used to drive the transmission shaft to rotate around the axis of the output shaft, the connecting piece is fixedly connected to the brush head assembly, the connecting piece is provided with a slide groove, the transmission shaft passes through the slide groove, when the output shaft drives the transmission shaft to rotate around the axis of the output shaft, the transmission shaft drives the connecting piece to swing, and the connecting piece drives the brush head assembly to swing.

[0014] In one embodiment, the connecting member is further provided with a connecting hole, and the brush head assembly comprises a driving shaft, and the driving shaft is inserted into the connecting hole and fixedly connected to the connecting hole.

[0015] In one embodiment, the length of the slide groove is greater than or equal to the rotation diameter of the transmission shaft.

[0016] In one embodiment, the small-diameter electric toothbrush further includes a control board, which is disposed in the accommodating cavity, is electrically connected to the power source, and is used to control the power source.

[0017] In one embodiment, the control board further includes a switch button, which is mounted on the outer surface of the brush handle and connected to the control board for controlling the switch of the control board.

[0018] In the small-diameter electric toothbrush provided by the embodiment of the utility model, the motor of the small-diameter electric toothbrush uses a neodymium iron boron magnet, thereby enhancing the magnetism of the magnet in the motor, so that the motor can output a stall torque of 40g·cm when the diameter is less than or equal to 16mm, ensuring that the small-diameter electric toothbrush has sufficient cleaning ability. Therefore, the small-diameter electric toothbrush using the motor can reduce the diameter of the electric toothbrush while maintaining the cleaning ability, thereby improving the comfort of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a simplified structural diagram of a small-diameter electric toothbrush according to an embodiment of the present utility model.

[0021] Figure 2 It is a schematic structural diagram of a transmission assembly according to an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all of the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0025] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0026] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0027] Please refer to Figure 1 and Figure 2 , a small diameter electric toothbrush, comprising:

[0028] A motor 1, wherein the motor 1 includes a neodymium iron boron magnet, the diameter of the motor 1 is less than or equal to 16 mm, and the stall torque of the motor 1 is greater than 40 g·cm;

[0029] The transmission assembly 2 includes a first end and a second end opposite to each other, the first end is in transmission connection with the motor 1, and the motor 1 is used to drive the first end to drive the second end to rotate;

[0030] The brush head assembly 3 is connected to the second end portion, and the second end portion is used to drive the brush head assembly 3 to swing.

[0031] like Figure 1 As shown, the small-diameter electric toothbrush includes a motor 1, a transmission assembly 2 and a brush head assembly 3. Bristles are fixedly mounted on the brush head assembly 3, and the movement of the brush head assembly 3 drives the bristles to move, thereby cleaning the oral cavity. In this embodiment, the motor 1 is used as a power element to drive the brush head assembly 3 to move. However, usually the motor 1 outputs rotational motion, so directly connecting the motor 1 to the brush head assembly 3 will drive the brush head assembly 3 to rotate. Obviously, this is not the action required to clean the oral cavity. In one embodiment, the motor 1 includes multiple sets of coils.

[0032] Therefore, in this embodiment, a transmission assembly 2 is further provided, and the motor 1 is connected to the brush head assembly 3 through the transmission assembly 2. The first end of the transmission assembly 2 is connected to the motor 1, and rotates under the drive of the motor 1. The first end is transmission-connected to the second end, so that the first end drives the second end to swing back and forth. The second end is then fixedly connected to the brush head assembly 3, so that the second end drives the brush head assembly 3 to swing back and forth together, so that the brush head assembly 3 cleans the oral cavity.

[0033] The cleaning ability of an electric toothbrush is related to the torque applied to the brush head assembly 3. Within a certain range, the greater the torque applied to the brush head assembly 3, the higher the cleaning efficiency. The torque applied to the brush head assembly 3 is provided by the motor 1. In the prior art, in order to increase the torque applied to the brush head assembly 3, a motor with a diameter of about 20 mm is generally selected to ensure sufficient power. However, a motor with a diameter of about 20 mm is too large, which will affect the user's grip and comfort of use.

[0034] In this embodiment, the diameter of the motor 1 is less than or equal to 16 mm, which can improve the comfort of using a small-diameter electric toothbrush. However, the output of a common small-diameter motor has a stall torque of about 20 g·cm. Obviously, this power is not enough to support a sufficient cleaning effect.

[0035] Therefore, the motor 1 in this embodiment uses neodymium iron boron magnets, which have stronger magnetism than ordinary magnets. According to the physical formula of Ampere force, F=BIL, where F represents the magnitude of the Ampere force, B represents the magnetic induction intensity, I represents the intensity of the current, and L represents the effective length of the conductor in the direction perpendicular to the magnetic field. Then, by using neodymium iron boron magnets to increase the magnetic induction intensity, the Ampere force output by the motor 1 can be increased, thereby achieving the effect of increasing the stall torque. Similarly, adding multiple sets of coils inside the motor 1 or thickening the wire of the coil can increase the Ampere force and achieve the effect of increasing the stall torque. Similarly, the motor 1 can also use ferrite magnets with better performance to achieve the same effect.

[0036] In the present application, the diameter of the motor 1 is first reduced to improve the comfort of the small-diameter electric toothbrush. At the same time, the motor 1 uses a neodymium iron boron magnet to increase the magnetic induction intensity, thereby increasing the stall torque of the motor 1. When the motor 1 has a diameter less than or equal to 16 mm, it can still output a stall torque of 40 g·cm, achieving both comfort and cleaning power.

[0037] In one embodiment, the small-diameter electric toothbrush further comprises a handle 4, the handle 4 is provided with a receiving cavity, the receiving cavity is used to install the motor 1 and the transmission assembly 2, the brush head assembly 3 is rotatably connected to the handle 4, and the diameter of the handle 4 is less than or equal to 27 mm. In one embodiment, the small-diameter electric toothbrush further comprises a power supply 5, and the power supply 5 comprises a lithium battery. In one embodiment, the small-diameter electric toothbrush further comprises a wireless charging coil 6, the wireless charging coil 6 is installed in the receiving cavity, the wireless charging coil 6 is arranged on the side of the power supply 5 away from the brush head assembly 3, and the wireless charging coil 6 is used to charge the power supply 5. In one embodiment, the small-diameter electric toothbrush further comprises a control board 7, the control board 7 is arranged in the receiving cavity, the control board 7 is electrically connected to the power supply 5, and the control board 7 is used to control the power supply 5. In one embodiment, the control board 7 further comprises a switch button 8, the switch button 8 is installed on the outer surface of the handle 4, the switch button 8 is connected to the control board 7, and is used to control the switch of the control board 7.

[0038] like Figure 1 As shown, the interior of the brush handle 4 is provided with an installation space, and the installation space is a receiving cavity. In the receiving cavity, a power supply 5, a motor 1, a transmission assembly 2 and a brush head assembly 3 are arranged in order from bottom to top. The wireless charging coil 6 is installed directly below the power supply 5, and the wireless charging coil 6 is directly opposite to the power supply 5, which is conducive to charging the power supply 5. And it is also more convenient to use the wireless charging coil 6 to charge the power supply 5. However, it is not limited to this. The small-diameter electric toothbrush provided by the utility model also includes charging methods such as Type-C interface charging and magnetic charging.

[0039] In this embodiment, the power source 5 uses a 14500 battery. Because the 14500 battery is a No. 5 battery with a diameter of 14.5 mm, it is beneficial to reduce the volume of the power source 5. However, the power source 5 is not limited thereto, and further includes a nickel-hydrogen battery. At the same time, the 14500 battery can output a voltage of 3.7 V. Under the condition that other conditions remain unchanged, increasing the voltage can increase the current, further increasing the Ampere force, and achieving the effect of increasing the stall torque.

[0040] A control board 7 is also installed on the side of the accommodating cavity. The power output of the motor 1 is controlled by the control board 7, so that the small-diameter electric toothbrush has multiple functions and is suitable for different situations. A switch button 8 is also installed on the side of the brush handle 4 near the brush head assembly 3. The switch button 8 controls the switch of the control board 7 and the control board 7 controls the power supply 8.

[0041] Because the diameter of the motor is about 16 mm, the diameter of the power source 5 is about 14.5 mm, and the control board 7 is just an ordinary circuit board, which occupies a small space. Therefore, in this embodiment, the diameter of the brush handle 4 can be controlled to about 27 mm, which can give the user a more comfortable experience.

[0042] The small diameter electric toothbrush provided in this embodiment has a brush head pressure sensing requirement, so 2 mm is reserved for the pressure swing structure. When the small diameter electric toothbrush does not need a brush head pressure sensing requirement, no reservation is required, and the volume of the small diameter electric toothbrush can be further reduced, so that the diameter of the brush handle 4 is controlled to be less than or equal to 25 mm.

[0043] In one embodiment, the transmission assembly 2 includes an output shaft 21, a transmission shaft 22 and a connecting member 23. The output shaft 21 is connected to the motor 1 in a transmission manner. The motor 1 is used to drive the output shaft 21 to rotate. The transmission shaft 22 is connected to the end of the output shaft 21. The axis of the transmission shaft 22 is parallel to the axis of the output shaft 21. The output shaft 21 is used to drive the transmission shaft 22 to rotate around the axis of the output shaft 21. The connecting member 23 is fixedly connected to the brush head assembly 3. The connecting member 23 is provided with a slide groove 231. The transmission shaft 22 passes through the slide groove 231. When the output shaft 21 drives the transmission shaft 22 to rotate around the axis of the output shaft 21, the transmission shaft 22 drives the connecting member 23 to swing. In one embodiment, the length of the slide groove 231 is greater than or equal to the rotation diameter of the transmission shaft 22. In one embodiment, the length of the slide groove 231 is greater than or equal to the rotation diameter of the transmission shaft 22.

[0044] like Figure 2 As shown, the output shaft 21 rotates under the drive of the motor 1. Because the transmission shaft 22 is installed at a position deviated from the axis of the output shaft 21, the transmission shaft 22 revolves around the axis of the output shaft 21 under the drive of the output shaft 21. In a plane perpendicular to the axis of the transmission shaft 22, the circular motion of the transmission shaft 22 can be decomposed into motions in two mutually perpendicular directions, which are defined as the X direction and the Y direction.

[0045] Because the transmission shaft 22 and the connecting member 23 are slidably connected via the slide groove 231, when the transmission shaft 22 performs a circular motion, the movement of the transmission shaft 22 in one direction will slide along the slide groove 231. In this embodiment, the movement of the transmission shaft 22 in the X direction is sliding along the slide groove 231, and the movement of the transmission shaft 22 in the Y direction will abut against the slide groove 231, driving the slide groove 231 to move along the Y direction. Because the transmission shaft 22 performs a circular motion, the movement of the transmission shaft 22 in the Y direction is a reciprocating motion, which also drives the slide groove 231 to perform a reciprocating motion in the Y direction.

[0046] Because the brush head assembly 3 is rotatably connected to the brush handle 4, the movement of the brush head assembly 3 is restricted by the brush handle 4, and the brush head assembly 3 can only rotate relative to the brush handle 4. Since the connecting member 23 is fixedly connected to the brush head assembly 3, the movement of the connecting member 23 is also restricted, and the part of the connecting member 23 connected to the brush head assembly 3 is defined as point A. Then when the transmission shaft 22 abuts against the slide groove 231 and moves along the Y direction, because the part of the connecting member 23 connected to the brush head assembly 3 cannot move, the slide groove 231 can only reciprocate with point A as the center of the circle. Therefore, the brush head assembly 3 reciprocates under the drive of the slide groove 231. At the same time, the length of the slide groove 231 is greater than or equal to the rotation diameter of the transmission shaft 22, thereby ensuring that the transmission shaft 22 can perform a complete circular motion, thereby driving the slide groove 231 to reciprocate.

[0047] In this embodiment, only one connecting member 23 is connected between the brush head assembly 3 and the transmission shaft 22 to drive the brush head assembly 3 to swing, thereby reducing the number of transmission components, saving space, and further reducing the diameter of the brush handle 4.

[0048] In one embodiment, the connecting member 23 is further provided with a connecting hole 232 , and the brush head assembly 3 includes a driving shaft 31 , and the driving shaft 31 is inserted into the connecting hole 232 and fixedly connected to the connecting hole 232 .

[0049] Please refer to Figure 1 and Figure 2 In this embodiment, the brush head assembly 3 includes a driving shaft 31, a transmission member 32 and a brush head 33. The driving shaft 31 is connected to the transmission member 32 to drive the transmission member 32 to swing. The transmission member 32 is connected to the brush head 33 to drive the brush head 33 to swing, that is, the driving shaft 31 drives the brush head 33 to swing. The connecting member 23 is fixedly connected to the driving shaft 31 through the connecting hole 232, driving the driving shaft 31 to swing, so the connecting member 23 can drive the brush head 33 to swing.

[0050] The drive shaft 31 is fixedly connected to the connecting hole 232 by being inserted into the connecting hole 232. Then the inner wall surface of the entire connecting hole 232 can contact the brush head assembly 3, increasing the contact area. Therefore, the connecting member 23 drives the brush head assembly 3 to swing more stably.

[0051] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the attached claims.

Claims

1. A small diameter electric toothbrush, characterized in that: include: A motor (1), the motor (1) comprising a neodymium iron boron magnet, the diameter of the motor (1) being less than or equal to 16 mm, and the stall torque of the motor (1) being greater than 40 g·cm; A transmission assembly (2), the transmission assembly (2) comprising a first end and a second end opposite to each other, the first end being in transmission connection with the motor (1), the motor (1) being used to drive the first end to drive the second end to rotate; A brush head assembly (3), wherein the brush head assembly (3) is connected to the second end portion, and the second end portion is used to drive the brush head assembly (3) to swing.

2. The small-diameter electric toothbrush according to claim 1, characterized in that: The motor (1) comprises a plurality of coils.

3. The small-diameter electric toothbrush according to claim 1, characterized in that: The small-diameter electric toothbrush further comprises a brush handle (4), wherein the brush handle (4) is provided with a receiving cavity, wherein the receiving cavity is used to install the motor (1) and the transmission assembly (2), and the brush head assembly (3) is rotatably connected to the brush handle (4), and the diameter of the brush handle (4) is less than or equal to 27 mm.

4. The small-diameter electric toothbrush according to claim 3, characterized in that: The small-diameter electric toothbrush further comprises a power source (5), and the power source (5) comprises a lithium battery.

5. The small-diameter electric toothbrush according to claim 4, characterized in that: The small-diameter electric toothbrush further comprises a wireless charging coil (6), wherein the wireless charging coil (6) is installed in the accommodating cavity, and the wireless charging coil (6) is arranged on a side of the power source (5) away from the brush head assembly (3), and the wireless charging coil (6) is used to charge the power source (5).

6. The small-diameter electric toothbrush according to claim 3, characterized in that: The transmission assembly (2) comprises an output shaft (21), a transmission shaft (22) and a connecting member (23); the output shaft (21) is transmission-connected to the motor (1); the motor (1) is used for driving the output shaft (21) to rotate; the transmission shaft (22) is connected to the end of the output shaft (21); the axis of the transmission shaft (22) is parallel to the axis of the output shaft (21); the output shaft (21) is used for driving the transmission shaft (22) to rotate around the axis of the output shaft (21); the connecting member (23) is fixedly connected to the brush head assembly (3); the connecting member (23) is provided with a slide groove (231); the transmission shaft (22) passes through the slide groove (231); when the output shaft (21) drives the transmission shaft (22) to rotate around the axis of the output shaft (21), the transmission shaft (22) drives the connecting member (23) to swing, and the connecting member (23) drives the brush head assembly (3) to swing.

7. The small-diameter electric toothbrush according to claim 6, characterized in that: The connecting piece (23) is also provided with a connecting hole (232); the brush head assembly (3) comprises a driving shaft (31); the driving shaft (31) is inserted into the connecting hole (232) and fixedly connected to the connecting hole (232).

8. The small-diameter electric toothbrush according to claim 6, characterized in that: The length of the sliding groove (231) is greater than or equal to the rotation diameter of the transmission shaft (22).

9. The small-diameter electric toothbrush according to claim 4, characterized in that: The small-diameter electric toothbrush further comprises a control board (7), wherein the control board (7) is arranged in the accommodating cavity, the control board (7) is electrically connected to the power source (5), and the control board (7) is used to control the power source (5).

10. The small-diameter electric toothbrush according to claim 9, characterized in that: The control panel (7) further comprises a switch button (8), wherein the switch button (8) is mounted on the outer surface of the brush handle (4), and the switch button (8) is connected to the control panel (7) and is used to control the switch of the control panel (7).

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