Driving device and electric toothbrush

Abstract

The embodiment of the utility model relates to the technical field of electric appliances, and discloses a driving device and an electric toothbrush. The motor comprises a shell and a rotating shaft with the two ends extending out of the shell. The motor drives the rotating shaft to rotate around the axis in a reciprocating mode in the working state. The air cylinder comprises a cylinder body, an air inlet one-way valve and an air outlet one-way valve, the cylinder body is provided with a moving end, an air inlet and an air outlet, the air inlet one-way valve is arranged at the air inlet, and the air outlet one-way valve is arranged at the air outlet; one end of the rotating shaft is in driving connection with the moving end through the connecting assembly, the rotating shaft drives the moving end to reciprocate to change the volume of a cavity in the cylinder body, when the volume of the cavity in the cylinder body is increased, the air inlet one-way valve is opened to suck air from the air inlet, and when the volume of the cavity in the cylinder body is decreased, the air outlet one-way valve is opened to discharge air from the air outlet. By means of the mode, the driving device can drive the rotating shaft and the air cylinder at the same time only through one motor, and the size and the weight are smaller.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, specifically to a driving device and an electric toothbrush. Background Technology

[0002] An air pump is a device that uses mechanical motion to expel or add air from a closed space. Its core function is to generate air pressure by compressing gas to achieve gas delivery or pressure regulation. Existing bubble toothbrushes contain an air pump to generate bubbles in the brush head. The impact force generated by the bursting of these bubbles removes residue from between the teeth. The air pump requires a separate motor, and the bubble toothbrush also needs another motor to drive the brush head to oscillate back and forth for cleaning. Therefore, bubble toothbrushes require two separate motors, resulting in a larger product weight and size. Utility Model Content

[0003] In view of the above problems, this utility model provides a driving device and an electric toothbrush to solve at least one of the above technical problems.

[0004] According to one aspect of the present invention, a driving device is provided, the driving device including a motor and a cylinder;

[0005] The motor includes a housing and a rotating shaft extending from both ends of the housing. When the motor is in operation, it drives the rotating shaft to reciprocate around the axis of the rotating shaft.

[0006] The cylinder includes at least one, and the cylinder includes a cylinder body, an inlet one-way valve and an outlet one-way valve. The cylinder body is provided with a moving end, an inlet and an outlet. The inlet one-way valve is located at the inlet and the outlet one-way valve is located at the outlet.

[0007] One end of the rotating shaft is driven to be connected to the moving end through a connecting component. The rotating shaft drives the moving end to reciprocate to change the cavity volume inside the cylinder. When the cavity volume inside the cylinder increases, the intake one-way valve opens to draw in gas from the intake port. When the cavity volume inside the cylinder decreases, the exhaust one-way valve opens to discharge gas from the exhaust port.

[0008] In one alternative embodiment, the connecting assembly includes a swing shaft and a bracket, with the two ends of the swing shaft connected to one end of the rotating shaft and one end of the bracket, respectively; the other end of the bracket is connected to the moving end.

[0009] In one alternative embodiment, the bracket is rotatably connected to an external component via a rotating shaft. The bracket is provided with a track groove, which is an arc-shaped groove. One end of the swing shaft passes through the track groove. Driven by the rotating shaft, one end of the swing shaft swings back and forth in the track groove and drives the bracket to swing back and forth around the rotating shaft.

[0010] The two ends of the bracket extend outward to form two connecting parts, which are located at the two ends of the track groove, respectively.

[0011] The cylinder includes two cylinders, and the moving ends of the two cylinders are respectively connected to the two connecting parts of the bracket.

[0012] In one alternative embodiment, the bracket comprises two, the swing shaft passes through the rotating shaft and extends out of the rotating shaft at both ends, and the two brackets are respectively disposed at the two ends of the swing shaft;

[0013] The cylinders include four cylinders, wherein the moving ends of two cylinders are respectively connected to two connecting parts of one of the brackets, and the moving ends of the other two cylinders are respectively connected to two connecting parts of the other bracket.

[0014] In one alternative embodiment, the cylinder includes a body, one end of which is the moving end, and the body is made of a flexible material.

[0015] In one alternative embodiment, the cylinder body further includes a bottom wall connected to the other end of the main body, the bottom wall forming the cavity between the main body and the bottom wall, the air inlet and the air outlet being disposed on the bottom wall, and the bottom walls of the two cylinders being integrally formed.

[0016] The driving device further includes an air chamber component, which has an air inlet groove and an air outlet groove on one side. The bottom wall is sandwiched between the body and the air chamber component. An air inlet cavity is formed between the air inlet groove and the bottom wall, and an air outlet cavity is formed between the air outlet groove and the bottom wall. The air inlet cavity and the air outlet cavity are isolated from each other, and both the air inlet cavity and the air outlet cavity are connected to the outside.

[0017] When any of the cylinders draws in gas, the corresponding air inlet is connected to the air inlet chamber, and when any of the cylinders discharges gas, the corresponding air outlet is connected to the air outlet chamber.

[0018] In one alternative embodiment, the rotating shaft has an internal channel that extends through the shaft along its axis, and the air outlet is connected to one end of the channel, so that the discharged gas is discharged from the other end of the channel.

[0019] In one alternative embodiment, the cylinder has at least one air inlet, and the total area of ​​the cylinder air inlets is greater than the area of ​​the cylinder air outlet.

[0020] According to another aspect of the present invention, an electric toothbrush is also provided, the electric toothbrush including a handle, a brush head and the aforementioned driving device, the driving device being mounted on the handle, the other end of the rotating shaft extending out of the handle and being connected to the brush head in a transmission manner, the brush head having an air outlet on one side surface where bristles are provided, and the air outlet communicating with the air outlet.

[0021] In one alternative embodiment, one end of the handle is provided with an air inlet, which connects to the air intake port and the outside when the cylinder draws in gas.

[0022] In this embodiment, the drive device not only drives the rotating shaft to rotate via a motor, but also drives the moving end of the cylinder via a connecting assembly. This causes the moving end of the cylinder to reciprocate, changing the volume of the cavity within the cylinder. When the cavity volume increases, the intake check valve opens to allow air to be drawn in; when the cavity volume decreases, the exhaust check valve opens to allow air to be exhausted. Therefore, the motor can also drive the cylinder to both draw in and exhaust air. This embodiment's drive device requires only one motor to simultaneously drive both the rotating shaft and the cylinder, eliminating the need for two separate motors, thus saving on power and reducing the overall size and weight of the drive device.

[0023] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0025] Figure 1 This is a perspective view of one embodiment of the driving device of this utility model;

[0026] Figure 2 This is a perspective view of another embodiment of the driving device of this utility model;

[0027] Figure 3 This is a schematic diagram of the structure of the cylinder and air chamber components of the drive device of this utility model;

[0028] Figure 4 for Figure 3 The structural disassembly diagram shown;

[0029] Figure 5 for Figure 3 The sectional view shown;

[0030] Figure 6 This is a schematic diagram of the structure of the electric toothbrush of this utility model;

[0031] Figure 7 This is a schematic diagram of the structure of the brush head of the electric toothbrush of this utility model.

[0032] The reference numerals in the detailed embodiments are as follows:

[0033] Motor 1, cylinder 2, housing 11, rotating shaft 12, cylinder body 21, inlet check valve 22, outlet check valve 23, moving end 211, inlet port 212, outlet port 213, connecting assembly 3, swing shaft 31, bracket 32, track groove 321, connecting part 322, body 214, bottom wall 215, air chamber component 4, inlet groove 41, outlet groove 42, inlet chamber 43, outlet chamber 44, handle 5, brush head 6, outlet hole 61, inlet hole 51. Detailed Implementation

[0034] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0035] Please refer to the following: Figures 1-4 The driving device of this utility model embodiment includes a motor 1 and a cylinder 2. The motor 1 can convert electrical energy into mechanical energy. The motor 1 can be any type of motor, for example, the motor 1 is a sonic motor. The motor 1 includes a housing 11 and a rotating shaft 12 extending from both ends of the housing 11. In the working state, the motor 1 drives the rotating shaft 12 to reciprocate along the axis of the rotating shaft 12, that is, the motor 1 can drive the rotating shaft 12 to rotate.

[0036] The cylinder 2 includes at least one, but can also include two, three, or four cylinders, or other quantities. In this embodiment, the cylinder 2 can be a piston, screw, or diaphragm type cylinder. The cylinder 2 includes a cylinder body 21, an inlet check valve 22, and an outlet check valve 23. The cylinder body 21 has a moving end 211, an inlet port 212, and an outlet port 213. The inlet check valve 22 is located at the inlet port 212, and the outlet check valve 23 is located at the outlet port 213. Through the mechanical movement of the piston, screw, and diaphragm, the inlet check valve 22 opens to draw gas into the cylinder 2 through the inlet port 212, and the outlet check valve 23 opens to discharge the gas in the cylinder 2 through the outlet port 213.

[0037] One end of the rotating shaft 12 drives the moving end 211 of the cylinder 2 via the connecting assembly 3. In one embodiment, the connecting assembly 3 can connect to the moving end 211 of one cylinder 2; in other embodiments, the connecting assembly 3 can connect to the moving ends 211 of two or more cylinders 2. The rotating shaft 12 drives the moving end 211 to reciprocate to change the volume of the cavity inside the cylinder body 21. When the volume of the cavity inside the cylinder body 21 increases, the pressure inside the cavity decreases, and the pressure difference between the outside and the cavity causes the intake one-way valve 22 to open, drawing gas into the cavity from the intake port 212. When the volume of the cavity inside the cylinder body 21 decreases, the pressure inside the cavity increases, and the pressure difference between the outside and the cavity causes the exhaust one-way valve 23 to open, and the gas inside the cavity is discharged from the exhaust port 213. That is, the motor 1 can drive at least one cylinder 2 via the rotating shaft 12 and the connecting assembly 3, causing the cylinder 2 to draw in and discharge gas.

[0038] In this embodiment, the drive device not only drives the rotating shaft 12 to rotate via the motor 1, but also drives the moving end 211 of the cylinder 2 via the connecting component 3. This causes the moving end 211 of the cylinder 2 to reciprocate. The reciprocating motion of the moving end 211 changes the volume of the cavity inside the cylinder 21. When the cavity volume increases, the intake one-way valve 22 opens to draw in air; when the cavity volume decreases, the exhaust one-way valve 23 opens to exhaust air. Therefore, the motor 1 can also drive the cylinder 2 to draw in and exhaust air. This embodiment's drive device requires only one motor 1 to simultaneously drive the rotating shaft 12 and the cylinder 2, eliminating the need for two separate motors. This saves on power and reduces the overall size and weight of the drive device.

[0039] like Figure 1 and Figure 2 As shown, the connecting assembly 3 includes a swing shaft 31 and a bracket 32. The two ends of the swing shaft 31 are respectively connected to one end of the rotating shaft 12 and one end of the bracket 32, and the other end of the bracket 32 ​​is connected to the moving end 211. The swing shaft 31 and the rotating shaft 12 are fixedly connected. Figure 1 As shown, the swing shaft 31 is fixedly mounted on the rotating shaft 12 and can be vertically connected to the rotating shaft 12 and the bracket 32. When the rotating shaft 12 rotates, it drives the swing shaft 31 and the bracket 32 ​​to move, thereby driving the moving end 211 of the cylinder 2 to move.

[0040] In one embodiment, the bracket 32 ​​is rotatably connected to an external component via a rotating shaft (not shown in the figure). The external component can be a housing 11 or other components that provide support and fixation. The bracket 32 ​​can swing about the rotating shaft under the support and fixation of this external component. Figure 2 As shown, a through hole can be opened in the bracket 32, and a rotating shaft can be inserted through the through hole and fixed to the external component.

[0041] The bracket 32 ​​is provided with a track groove 321, which is an arc-shaped groove. One end of the swing shaft 31 passes through the track groove 321. Driven by the rotating shaft 12, one end of the swing shaft 31 swings back and forth in the track groove 321, driving the bracket 32 ​​to swing back and forth around its rotation axis. At the other end of the bracket 32, two connecting parts 322 extend outward from both ends, respectively, and are located at both ends of the track groove 321. In this embodiment, there are two cylinders 2, and the moving ends 211 of the two cylinders 2 are respectively connected to the two connecting parts 322 of the bracket 32. Figure 2 As shown, the two connecting parts 322 are located at the left and right ends of the track groove 321, respectively. One connecting part 322 is connected to the moving end 211 of a cylinder 2. When the rotating shaft 12 drives one end of the lower swing shaft 31 to swing back and forth in the track groove 321, one end of the swing shaft 31 drives the bracket 32 ​​to swing back and forth around its rotating axis. When the bracket 32 ​​swings, causing the left connecting part 322 to move downward, the moving end 211 of the left cylinder 1 moves downward, causing the cavity volume in the cylinder body 21 to decrease and exhaust air. At the same time, the right connecting part 322 moves upward, and the moving end 211 of the right cylinder 1 moves upward, causing the cavity volume in the cylinder body 21 to increase and draw in air.

[0042] In this embodiment, one end of the swing shaft 31 swings back and forth in the arc-shaped track groove 321 of the bracket 32 ​​to drive the bracket 32 ​​to swing back and forth around its rotation axis. When the bracket 32 ​​swings back and forth, its connecting part 322 moves, causing the moving end 211 of the cylinder 2 to move. Since the two connecting parts 322 are located at the two ends of the track groove 321 respectively, the moving ends 211 of the two cylinders 2 move in opposite directions. For example, the moving end 211 of one cylinder 2 moves upward and the moving end 211 of the other cylinder 2 moves downward, so that the cavity volume of one cylinder 2 becomes smaller and the cavity volume of the other cylinder 2 becomes larger. That is, one cylinder 2 draws in gas, while the other cylinder 2 discharges gas. In this embodiment, two cylinders 2 are provided to ensure continuous gas discharge without time interval.

[0043] Furthermore, such as Figure 1 As shown, the swing shaft 31 passes through the rotating shaft 12 and extends out of the rotating shaft 12 at both ends. Two supports 32 are included, each corresponding to one end of the swing shaft 31. Four cylinders 2 are included, with the moving ends 211 of two cylinders 2 respectively connected to the two connecting parts 322 of one of the supports 32, and the moving ends 211 of the other two cylinders 2 respectively connected to the two connecting parts 322 of the other support 32. Figure 1As shown, the swing shaft 31 causes the two supports 32 to move in the same direction. When the two supports 32 swing, causing the connecting parts 322 of the two cylinders 2 on the left to move downwards, the moving ends 211 of the two cylinders 2 on the left also move downwards, causing the cavity volume inside the two cylinder bodies 21 to decrease and exhaust gas. At the same time, the connecting parts 322 of the two cylinders 2 on the right move upwards, and the moving ends 211 of the two cylinders 1 on the right also move upwards, causing the cavity volume inside the two cylinder bodies 21 to increase and draw in gas. Thus, two of the cylinders 2 draw in gas, while the other two cylinders 2 expel gas.

[0044] This embodiment uses two supports 32 and four cylinders 2 to allow two cylinders 2 to draw in gas while the other two cylinders 2 discharge gas. The four cylinders 2 ensure continuous gas discharge without time intervals and also increase the intake volume, thereby making the discharged airflow faster.

[0045] In one embodiment, such as Figure 2 and Figure 4 As shown, the cylinder body 21 includes a main body 214, one end of which is a moving end 211. The main body 214 is made of a flexible material. Preferably, the main body 214 is made of soft rubber. Because the main body 214 is made of a flexible material, the moving end 211 moves under the drive of the bracket 32, thereby stretching or compressing the main body 214. When the main body 214 is stretched, the cavity volume increases and air is introduced; when the main body 214 is compressed, the cavity volume decreases and air is discharged. In this embodiment, the main body 214 is made of a flexible material, making the driving device equivalent to a diaphragm pump. The main body 214 is both the diaphragm and part of the external structure of the cylinder 2. The diaphragm and part of the external structure of the cylinder 2 are integrated into one unit, simplifying the structure and helping to further reduce the size of the driving device.

[0046] Furthermore, such as Figure 2 and Figure 4 As shown, the cylinder body 21 also includes a bottom wall 215, which is connected to the other end of the main body 214. A cavity is formed between the bottom wall 215 and the main body 214. The air inlet 212 and the air outlet 213 are provided on the bottom wall 215. The bottom walls 215 of the two cylinders 2 are integrally formed. Optionally, the two main bodies 214 can be integrally formed or can be set independently.

[0047] like Figure 4 and Figure 5As shown, cylinder 2 also includes a gas chamber component 4. One side of the gas chamber component 4 is provided with an inlet groove 41 and an outlet groove 42. A bottom wall 215 is sandwiched between the main body 214 and the gas chamber component 4. An inlet chamber 43 is formed between the inlet groove 41 and the bottom wall 215, and an outlet chamber 44 is formed between the outlet groove 42 and the bottom wall 215. The inlet chamber 43 and the outlet chamber 44 are isolated from each other, and both are connected to the outside. When any cylinder 2 draws in gas, the corresponding inlet port 212 connects to the inlet chamber 43; when any cylinder 2 discharges gas, the corresponding outlet port 213 connects to the outlet chamber 44.

[0048] In this embodiment, a bottom wall 215 and an air chamber component 4 are provided to form an air inlet chamber 43 and an air outlet chamber 44. The two air inlets 212 of the two cylinders 2 can be connected to the air inlet chamber 43, and the two air outlets 213 can be connected to the air outlet chamber 44. Both cylinders 2 can use the air inlet chamber 43 when they are inleting air, and can use the air outlet chamber 44 when they are outleting air. The sharing of components can simplify the overall structure and help to further reduce the size of the drive device.

[0049] In addition, the exhaust check valves 23 of the two cylinders 2 can be set separately or integrally formed. The integrally formed exhaust check valves 23 are located in the exhaust chamber 44.

[0050] In one embodiment, a channel (not shown in the figure) is provided inside the rotating shaft 12. The channel runs through the rotating shaft 12 along its axis, and one end of the channel is connected to the air outlet 213 of the cylinder 2. When the cylinder 2 discharges gas, it is discharged through the air outlet 213 into the channel of the rotating shaft 12, from one end of the channel to the other end, thus the gas is discharged from the other end of the channel. This embodiment uses the hollow rotating shaft 12 as the exhaust channel for the cylinder 2, eliminating the need for an additional exhaust channel, simplifying the structure, and helping to further reduce the size of the drive device.

[0051] Furthermore, such as Figure 4 As shown, each cylinder 2 has at least one air inlet 212, and each cylinder 2 can be provided with two, three, or more air inlets 212. The total area of ​​the air inlets 212 of each cylinder 2 is greater than the area of ​​the air outlet 213 of the cylinder 2. In this embodiment, the swinging of the bracket 32 ​​makes the air intake time and air outlet time the same. Under the condition of the same air intake and air outlet time, by setting the total area of ​​the air inlets 212 of the cylinder 2 to be greater than the area of ​​the air outlet 22 of the cylinder 2, it can be ensured that the cylinder 2 can quickly draw in a sufficient amount of gas when it intakes and generate a high-speed airflow when it exits.

[0052] like Figure 6 and Figure 7As shown, this embodiment of the utility model also provides an electric toothbrush, which includes a handle 5, a brush head 6, and a driving device according to any of the above embodiments. The driving device is mounted on the handle 5. Most of the structure of the driving device is mounted inside the handle 5, with only the other end of the rotating shaft 12 extending out of the handle 5. The other end of the rotating shaft 12 is connected to the brush head 6, and the rotation of the rotating shaft 12 drives the brush head 6 to rotate. An air outlet 61 is provided on the side surface of the brush head 6 where the bristles are located. The air outlet 213 of the cylinder 2 communicates with the air outlet 61. When the cylinder 2 discharges gas through the air outlet 213, the gas flows to the air outlet 61 of the brush head 6, generating bubbles on the side surface where the bristles are located. The rotating brush head 6, in conjunction with the bubbles, cleans the teeth.

[0053] Furthermore, such as Figure 6 As shown, one end of the handle 5 is provided with an air inlet 51. When the cylinder 2 draws in air, the air inlet 51 connects to the air inlet 212 and the outside. Air enters from the outside through the air inlet 51 of the handle 5 and enters the air inlet 212 of the cylinder 2, thus drawing air into the cylinder 2. Preferably, the air inlet 51 is located at the bottom of the handle 5 for convenient air intake without affecting the use of the electric toothbrush.

[0054] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by those skilled in the art to which the embodiments of this utility model pertain.

[0055] In the description of the embodiments of this utility model, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0056] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0057] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0058] In the description of the embodiments of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A driving device, characterized in that, The drive device includes a motor and a cylinder; The motor includes a housing and a rotating shaft extending from both ends of the housing. When the motor is in operation, it drives the rotating shaft to reciprocate around the axis of the rotating shaft. The cylinder includes at least one, and the cylinder includes a cylinder body, an inlet one-way valve and an outlet one-way valve. The cylinder body is provided with a moving end, an inlet and an outlet. The inlet one-way valve is located at the inlet and the outlet one-way valve is located at the outlet. One end of the rotating shaft is driven to be connected to the moving end through a connecting component. The rotating shaft drives the moving end to reciprocate to change the cavity volume inside the cylinder. When the cavity volume inside the cylinder increases, the intake one-way valve opens to draw in gas from the intake port. When the cavity volume inside the cylinder decreases, the exhaust one-way valve opens to discharge gas from the exhaust port.

2. The driving device according to claim 1, characterized in that, The connecting assembly includes a swing shaft and a bracket. The two ends of the swing shaft are respectively connected to one end of the rotating shaft and one end of the bracket; the other end of the bracket is connected to the moving end.

3. The driving device according to claim 2, characterized in that, The bracket is rotatably connected to an external component via a rotating shaft. The bracket is provided with a track groove, which is an arc-shaped groove. One end of the swing shaft passes through the track groove. Under the drive of the rotating shaft, one end of the swing shaft swings back and forth in the track groove and drives the bracket to swing back and forth around the rotating shaft. The two ends of the bracket extend outward to form two connecting parts, which are located at the two ends of the track groove, respectively. The cylinder includes two cylinders, and the moving ends of the two cylinders are respectively connected to the two connecting parts of the bracket.

4. The driving device according to claim 3, characterized in that, The bracket includes two brackets, the swing shaft passes through the rotating shaft and extends out of the rotating shaft at both ends, and the two brackets are respectively disposed at the two ends of the swing shaft; The cylinders include four cylinders, wherein the moving ends of two cylinders are respectively connected to two connecting parts of one of the brackets, and the moving ends of the other two cylinders are respectively connected to two connecting parts of the other bracket.

5. The driving device according to claim 3, characterized in that, The cylinder body includes a main body, one end of which is the moving end, and the main body is made of a flexible material.

6. The driving device according to claim 5, characterized in that, The cylinder body also includes a bottom wall, which is connected to the other end of the main body. The cavity is formed between the bottom wall and the main body. The air inlet and the air outlet are located on the bottom wall. The bottom walls of the two cylinders are integrally formed. The driving device further includes an air chamber component, which has an air inlet groove and an air outlet groove on one side. The bottom wall is sandwiched between the body and the air chamber component. An air inlet cavity is formed between the air inlet groove and the bottom wall, and an air outlet cavity is formed between the air outlet groove and the bottom wall. The air inlet cavity and the air outlet cavity are isolated from each other, and both the air inlet cavity and the air outlet cavity are connected to the outside. When any of the cylinders draws in gas, the corresponding air inlet is connected to the air inlet chamber, and when any of the cylinders discharges gas, the corresponding air outlet is connected to the air outlet chamber.

7. The driving device according to claim 1, characterized in that, The rotating shaft has an internal channel that runs through the shaft along its axis. The air outlet is connected to one end of the channel, so that the discharged gas is discharged from the other end of the channel.

8. The driving device according to claim 7, characterized in that, The cylinder has at least one air inlet, and the total area of ​​the air inlets is greater than the area of ​​the air outlet.

9. An electric toothbrush, characterized in that, The electric toothbrush includes a handle, a brush head, and a driving device according to any one of claims 1-8. The driving device is mounted on the handle, and the other end of the rotating shaft extends out of the handle and is connected to the brush head. The brush head has an air outlet on one side surface where bristles are provided, and the air outlet communicates with the air outlet.

10. The electric toothbrush according to claim 9, characterized in that, One end of the handle is provided with an air inlet, and when the cylinder draws in gas, the air inlet is connected to the air intake port and the outside.

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