Movement assembly and electric toothbrush

Abstract

The utility model relates to the technical field of electric toothbrushes, in particular to a machine core assembly and an electric toothbrush, the machine core assembly comprises a support with an installation groove, a transmission shaft, a coil assembly and a limiting assembly, the transmission shaft is arranged on the support in a swinging mode, and the transmission shaft comprises a first shaft section, a second shaft section and a third shaft section which are sequentially connected. The second shaft section and the third shaft section are both located in the mounting groove, at least two mounting holes are formed in the second shaft section, the two mounting holes are formed in the axial direction of the second shaft section in a spaced mode, and magnets are arranged in the two mounting holes; the coil assembly comprises a coil and a coil rack, the coil rack is provided with a containing groove in a penetrating mode in the radial direction of the transmission shaft, the side, in the radial direction of the transmission shaft, of the coil is provided with an opening, the coil rack is detachably connected with the support, and the coil is located in the containing groove, covers the magnet and is used for driving the magnet to swing in the axial direction of the transmission shaft; the transmission shaft is driven to swing relative to the support. The tooth brushing effect of the electric toothbrush is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric toothbrushes, and particularly relates to a core component and an electric toothbrush. Background Art

[0002] With the improvement of people's living standards, the attention to oral health is increasing. Electric toothbrushes have the advantages of strong cleaning ability, convenience and practicality, and can reduce tooth or gum damage, etc., and their popularity is growing day by day.

[0003] At present, the common electric toothbrushes on the market use a DC motor as the power, convert the rotary motion of the DC motor into a reciprocating motion, or directly connect to an eccentric wheel to do a rotary motion. Such electric toothbrushes have a low action frequency. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a core component, aiming to improve the brushing effect of the electric toothbrush.

[0005] To achieve the above purpose, the core component proposed by the utility model includes a bracket with an installation groove;

[0006] A transmission shaft is swingably arranged on the bracket. The transmission shaft includes a first shaft section, a second shaft section and a third shaft section connected in sequence. At least part of the first shaft section is arranged outside the installation groove and is used for connecting with the toothbrush head. The second shaft section and the third shaft section are both located in the installation groove. At least two installation holes are arranged on the second shaft section, and the two installation holes are arranged at intervals along the axial direction of the second shaft section. Magnets are arranged in both of the two installation holes;

[0007] A coil assembly includes a coil and a coil holder. The coil holder is provided with a receiving groove penetrating along the radial direction of the transmission shaft. One side of the coil along the radial direction of the transmission shaft is open. The coil holder is detachably connected to the bracket. The coil is located in the receiving groove and covers the magnet. The coil is used to drive the magnet to swing around the axial direction of the transmission shaft, so as to drive the transmission shaft to swing relative to the bracket; and

[0008] A limiting component is sleeved outside the third shaft section. The limiting component is used to provide a torque opposite to the swinging direction of the transmission shaft to the transmission shaft, so as to limit the swinging angle of the transmission shaft.

[0009] In one embodiment, the coil holder includes a gland and a fixed frame which are detachably connected. The gland is located on the side of the fixed frame away from the bracket. Connecting holes which are communicated with each other are arranged on the gland, the fixed frame and the bracket. A connecting piece sequentially passes through the connecting holes on the bracket, the fixed frame and the gland, so as to detachably connect the coil holder to the bracket.

[0010] In one embodiment, a first clamping portion is provided on the gland, and a second clamping portion is provided on the fixing frame. The first clamping portion extends along the radial direction of the transmission shaft, and the first clamping portion is clamped with the second clamping portion to connect the gland and the fixing frame.

[0011] In one embodiment, the first clamping portion includes a hook, and a clamping groove is provided on the second clamping portion. The hook is clamped in the clamping groove.

[0012] In one embodiment, a through hole communicating with the installation groove is provided at one end of the bracket close to the third shaft section, and a buffer member is provided outside one side of the bracket away from the first shaft section. The buffer member covers the through hole and is used to abut against the battery holder.

[0013] In one embodiment, the movement mechanism assembly further includes a bearing seat and a bearing installed in the bearing seat. The bearing is sleeved outside the first shaft section and is located in the installation groove, and at least part of the bearing seat is located in the installation groove and is connected to the bracket.

[0014] In one embodiment, the limiting assembly includes a fixing member and an elastic member. The fixing member is sleeved outside the third shaft section, and the elastic member is arranged along the radial direction of the third shaft section between the third shaft section and the fixing member. A first fixing groove is provided at one end of the fixing member away from the second shaft section. One end of the elastic member away from the second shaft section is connected to the third shaft section, and one end of the elastic member close to the second shaft section is arranged in the first fixing groove and is connected to the fixing member. The elastic member is used to provide a torque opposite to the swinging direction of the transmission shaft to the transmission shaft to limit the swinging angle of the transmission shaft.

[0015] In one embodiment, a second fixing groove is axially extended at one end of the third shaft section away from the second shaft section, and the second fixing groove penetrates along the radial direction of the third shaft section. One end of the elastic member away from the second shaft section is clamped in the second fixing groove.

[0016] In one embodiment, an adjusting member is provided on the third shaft section. The adjusting member is located on one side of the elastic member away from the second shaft section. The adjusting member abuts against the elastic member, and the adjusting member can move axially along the third shaft section to adjust the magnitude of the torque provided by the elastic member.

[0017] The present utility model further provides an electric toothbrush, which includes the mechanical assembly described in any one of the foregoing embodiments.

[0018] The technical solution of the present utility model electrically connects a coil assembly to a circuit board, and the circuit board is used to output a high-frequency pulsed square wave to the coil assembly; the high-frequency pulsed square wave can excite the coil assembly to generate a high-frequency alternating magnetic field, which acts on a magnet fixed on a transmission shaft, thereby driving the transmission shaft to generate high-frequency oscillations. At this time, the limiting assembly always provides an elastic restoring force to keep the transmission shaft in a balanced position, that is, provides a torque to the transmission shaft in the direction opposite to the oscillation direction of the transmission shaft. Therefore, the oscillation of the transmission shaft is not 360°, but oscillates back and forth within a certain angle range. By controlling the frequency of the pulsed square wave, a high-frequency brushing action can be generated; during actual use, the brushing action at this high frequency can generate a strong cavitation effect and pulsed effect massage function at the tip of the bristles, which can not only effectively clean the tooth surface, but also effectively clean the dental plaque and dental calculus deep in the tooth gaps, and massage the gums, which is beneficial to dental health. In addition, the coil holder is provided with a receiving groove penetrating in the radial direction of the transmission shaft, and the coil is fixed in the receiving groove. Since the receiving groove is penetrated, the heat generated by the coil during operation is dissipated, so as to maintain the normal and stable operation of the coil assembly, so that the electric toothbrush always maintains a normal state and enhances the brushing effect of the electric toothbrush. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0020] Figure 1 Structural schematic diagram of the electric toothbrush of the present utility model;

[0021] Figure 2 Structural schematic diagram of an embodiment of the movement assembly of the present utility model;

[0022] Figure 3 Structural schematic diagram of another embodiment of the movement assembly of the present utility model;

[0023] Figure 4 Structural schematic diagram of still another embodiment of the movement assembly of the present utility model;

[0024] Figure 5 Structural schematic diagram of yet another embodiment of the movement assembly of the present utility model.

[0025] Explanation of the reference numerals in the drawings:

[0026] 1 - Electric toothbrush, 10 - Movement assembly, 20 - Toothbrush head, 30 - Battery holder;

[0027] 11 - Bracket, 11a - Mounting groove, 11b - Through hole, 112 - Buffer member;

[0028] 12 - Transmission shaft, 121 - First shaft section, 122 - Second shaft section, 122a - Mounting hole, 1221 - Magnet, 1223 - Iron sheet, 123 - Third shaft section, 123a - Second fixing groove, 1231 - Adjusting member;

[0029] 13 - Coil assembly, 131 - Coil, 132 - Coil holder, 132a - Accommodating groove, 132b - Connecting hole, 1321 - Pressing cover, 1322 - Fixing bracket, 1323 - First clamping portion, 1324 - Second clamping portion, 133 - Connecting member;

[0030] 14 - Limiting assembly, 141 - Fixing member, 141a - First fixing groove, 142 - Elastic member;

[0031] 15 - Bearing seat, 151 - Bearing.

[0032] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0036] With the improvement of people's living standards, the attention paid to oral health is increasing. Electric toothbrushes have the advantages of strong cleaning ability, convenience and practicality, and can reduce tooth or gum damage, and their popularity is growing day by day.

[0037] At present, the common electric toothbrushes on the market use a DC motor as the power source, converting the rotary motion of the DC motor into a reciprocating motion, or directly connecting to an eccentric wheel to make a rotary motion. Such electric toothbrushes have a low action frequency.

[0038] To achieve the above object, please refer to Figures 1 to 5 , the movement component 10 proposed by the present utility model, the movement component 10 includes a bracket 11 having a mounting groove 11a;

[0039] A transmission shaft 12 is swingably disposed on the bracket 11. The transmission shaft 12 includes a first shaft section 121, a second shaft section 122 and a third shaft section 123 connected in sequence. At least a part of the first shaft section 121 is disposed outside the mounting groove 11a and is used to connect with the toothbrush head 20. The second shaft section 122 and the third shaft section 123 are both located inside the mounting groove 11a. At least two mounting holes 122a are provided on the second shaft section 122. The two mounting holes 122a are spaced along the axial direction of the second shaft section 122. Magnets 1221 are provided in both of the two mounting holes 122a;

[0040] A coil assembly 13 includes a coil 131 and a coil holder 132. The coil holder 132 is provided with a receiving groove 132a penetrating along the radial direction of the transmission shaft 12. One side of the coil 131 along the radial direction of the transmission shaft 12 is open. The coil holder 132 is detachably connected to the bracket 11. The coil 131 is located in the receiving groove 132a and covers outside the magnet 1221. The coil 131 is used to drive the magnet 1221 to swing around the axial direction of the transmission shaft 12, so as to drive the transmission shaft 12 to swing relative to the bracket 11; and

[0041] A limiting assembly 14 is sleeved outside the third shaft section 123. The limiting assembly 14 is used to provide a torque opposite to the swinging direction of the transmission shaft 12 to the transmission shaft 12, so as to limit the swinging angle of the transmission shaft 12.

[0042] In this embodiment, a coil assembly 13 is electrically connected to a circuit board, and the circuit board is used to output a high-frequency pulsed square wave to the coil assembly 13; the high-frequency pulsed square wave can excite the coil assembly 13 to generate a high-frequency alternating magnetic field, which acts on a magnet 1221 fixed on a transmission shaft 12, thereby driving the transmission shaft 12 to generate high-frequency oscillations. At this time, a limiting assembly 14 always provides an elastic restoring force that keeps the transmission shaft 12 in a balanced position, that is, provides a torque to the transmission shaft 12 in the direction opposite to the oscillation direction of the transmission shaft 12. Therefore, the oscillation of the transmission shaft 12 is not 360°, but oscillates back and forth within a certain angle range. By controlling the frequency of the pulsed square wave, a high-frequency brushing action can be generated; during actual use, the brushing action at this high frequency can generate a strong cavitation effect and pulsed effect massage function at the tip of the bristles, which can not only effectively clean the tooth surface, but also effectively clean the dental plaque and tartar deep in the tooth gaps, and massage the gums, which is beneficial to dental health.

[0043] In addition, the coil 131 will generate a certain amount of heat during the working process of driving the magnet 1221 to oscillate. If the coil assembly 13 and the transmission shaft 12 are in a high-load state for a long time or the ambient temperature is relatively high, the temperature will gradually rise, which will cause the resistivity of the coil 131 to decrease, resulting in a decrease in the oscillation efficiency of the transmission shaft 12 and affecting the brushing effect. In this embodiment, the coil assembly 13 includes a coil 131 and a coil holder 132. The coil holder 132 is provided with a receiving groove 132a penetrating along the radial direction of the transmission shaft 12, and the coil 131 is fixed in the receiving groove 132a. Since the receiving groove 132a is penetrated, the heat generated by the coil 131 during the working process is dissipated, so as to maintain the normal and stable operation of the coil assembly 13, so that the electric toothbrush 1 always maintains a normal state and enhances the brushing effect of the electric toothbrush 1.

[0044] In one embodiment, in order to further fix the magnet 1221 and improve the interaction between the magnet 1221 and the coil assembly 13, iron sheets 1223 are provided and fixed on both sides of the magnet 1221. This structural design can firmly fix the magnet 1221 inside the second shaft section 122 without loosening, and is conducive to assembly and manufacturing. The iron sheets 1223 can also enhance the interaction between the magnetic field generated by the coil assembly 13 and the magnet 1221, further improving the brushing effect. It should be noted that in this embodiment, iron sheets 1223 with relatively low cost are used. In other embodiments, the iron sheets 1223 can be other metal sheets, such as silver sheets, copper sheets, etc.

[0045] In one embodiment, in order to improve the interaction between the coil assembly 13 and the magnet 1221, the coil 131 is matched with the magnet 1221 by a silicon steel sheet group to improve the brushing effect of the electric toothbrush 1. The silicon steel sheet group is provided with an opening and covers the magnet 1221, that is, the silicon steel sheet group semi-surrounds the magnet 1221 to realize the interaction between the silicon steel sheet group and the magnet 1221.

[0046] In an embodiment of the present utility model, please refer to Figure 5 , the bobbin holder 132 includes a gland and a fixed frame that are detachably connected. The gland is located on the side of the fixed frame away from the bracket 11. Connecting holes 132b that communicate with each other are provided on the gland, the fixed frame, and the bracket 11. The connecting member 133 sequentially passes through the connecting holes 132b on the bracket 11, the fixed frame, and the gland to detachably connect the bobbin holder 132 to the bracket 11.

[0047] In this embodiment, in order to facilitate the connection between the bobbin holder 132 and the bracket 11 while ensuring the stability of the connection between the bobbin holder 132 and the bracket 11, the connecting member 133 is a bolt, and the connecting hole 132b is a threaded hole. The bolt passes through the threaded holes on the gland, the fixed frame, and the bracket 11 to threadedly connect the bobbin holder 132 and the bracket 11. In other embodiments, the connecting member can be other parts such as a pin.

[0048] In an embodiment of the present utility model, please refer to Figure 5 , a first clamping portion 1323 is provided on the gland, and a second clamping portion 1324 is provided on the fixed frame. The first clamping portion 1323 extends along the radial direction of the transmission shaft 12. The first clamping portion 1323 is clamped with the second clamping portion 1324 to connect the gland and the fixed frame.

[0049] In this embodiment, in order to improve the production efficiency of the bobbin holder 132 and facilitate the maintenance or replacement of the bobbin holder 132, the assembly of the bobbin holder 132 is realized by providing the first clamping portion 1323 and the second clamping portion 1324 on the gland 1321 and the fixed frame 1322. In one embodiment, the first clamping portion 1323 can be a clamping protrusion, and the second clamping portion 1324 can be a clamping groove corresponding to the clamping protrusion. The clamping protrusion is clamped in the clamping groove to realize the detachable connection between the gland 1321 and the fixed frame 1322. In other embodiments, the clamping method of the gland 1321 and the fixed frame 1322 is not limited.

[0050] In an embodiment of the present utility model, please refer to Figure 5 , the first clamping portion 1323 includes a hook, and the second clamping portion 1324 is provided with a clamping groove. The hook is clamped in the clamping groove.

[0051] In this embodiment, the hook is clamped in the clamping groove to realize the rapid assembly of the gland 1321 and the fixed frame 1322, and improve the production efficiency of the bobbin holder 132.

[0052] In an embodiment of the present utility model, please refer to Figure 3 and Figure 4, one end of the bracket 11 close to the third shaft section 123 is provided with a through hole 11b communicating with the installation groove 11a. A buffer member 112 is provided outside one side of the bracket 11 away from the first shaft section 121. The buffer member 112 covers the through hole 11b and is used to abut against the battery holder 30.

[0053] In this embodiment, in order to reduce the noise generated when the electric toothbrush 1 is working, a through hole 11b is provided at one end of the bracket 11 close to the third shaft section 123 to reduce the contact area between the bracket 11 and the battery holder 30 and reduce the noise generated by the resonance between the bracket 11 and the battery holder 30 caused by the vibration of the electric toothbrush 1 during operation; further, a buffer member 112 is provided at the through hole 11b. The buffer member 112 is located between the bracket 11 and the battery holder 30, and the buffer member 112 is used to buffer the collision between the bracket 11 and the battery holder 30, thereby reducing the above-mentioned noise. In one embodiment, the buffer member 112 is made of silicone or rubber with good elasticity.

[0054] In the embodiment of the present utility model, please refer to Figure 2 and Figure 4 , the movement assembly 10 further includes a bearing seat 15 and a bearing 151 installed in the bearing seat 15. The bearing 151 is sleeved outside the first shaft section 121 and is located in the installation groove 11a. At least part of the bearing seat 15 is located in the installation groove 11a and is connected to the bracket 11.

[0055] In the embodiment of the present utility model, please refer to Figure 4 , the limiting assembly 14 includes a fixing member 141 and an elastic member 142. The fixing member 141 is sleeved outside the third shaft section 123. The elastic member 142 is arranged radially along the third shaft section 123 between the third shaft section 123 and the fixing member 141. One end of the fixing member 141 away from the second shaft section 122 is provided with a first fixing groove 141a. One end of the elastic member 142 away from the second shaft section 122 is connected to the third shaft section 123. One end of the elastic member 142 close to the second shaft section 122 is arranged in the first fixing groove 141a and is connected to the fixing member 141. The elastic member 142 is used to provide a torque opposite to the swinging direction of the transmission shaft 12 to the transmission shaft 12 to limit the swinging angle of the transmission shaft 12.

[0056] In this embodiment, by providing the elastic member 142, the vibration amplitude of the movement assembly 10 can be reduced, and the problem of damage to the movement assembly 10 caused by excessive vibration amplitude can be avoided. In one embodiment, the elastic member 142 is a torque spring. By making full use of the solidity and elasticity of the torque spring material, through the symmetrical bending end structure, the torque of the elastic member 142 under force deformation is increased, and the vertically integrated fixed end has stronger stability, providing a solid foundation for the deformation of the elastic member 142 and the vibration of the movement assembly 10, and reducing the vibration amplitude of the movement assembly 10.

[0057] In the embodiment of the present utility model, please refer toFigure 4 One end of the third shaft segment 123 away from the second shaft segment 122 extends axially with a second fixing groove 123a. The second fixing groove 123a is arranged through the third shaft segment 123 in the radial direction. One end of the elastic member 142 away from the second shaft segment 122 is clamped in the second fixing groove 123a.

[0058] In this embodiment, in order to fix one end of the elastic member 142 away from the second shaft segment 122, the third shaft segment 123 is provided with a second fixing groove 123a. The second fixing groove 123a penetrates through the third shaft segment 123 in the radial direction, so that the end of the elastic member 142 can be clamped in the second fixing groove 123a, thereby restricting the displacement of the elastic member 142 in the radial or axial direction of the third shaft segment 123 when the transmission shaft 12 swings. In one embodiment, the elastic member 142 is a torque spring. When the transmission shaft 12 swings at a high frequency, the torque spring can provide a restoring force opposite to the swinging direction. This design can make the brushing action have a torsional force for elastic return.

[0059] In the embodiment of the present utility model, please refer to Figure 4 A regulating member 1231 is arranged on the third shaft segment 123. The regulating member 1231 is located on the side of the elastic member 142 away from the second shaft segment 122. The regulating member 1231 abuts against the elastic member 142. The regulating member 1231 can move axially along the third shaft segment 123 to adjust the magnitude of the torque provided by the elastic member 142.

[0060] In this embodiment, the regulating member 1231 moves axially along the third shaft segment 123 in the direction of approaching or departing from the second shaft segment 122. Since one end of the elastic member 142 is fixed to the fixing member 141 and the other end is fixed to the third shaft segment 123, the regulating member 1231 changes the pre-tightening elastic force of the elastic member 142 by squeezing or moving away from the elastic member 142, thereby changing the magnitude of the torque provided by the elastic member 142 to the third shaft segment 123, achieving the effect of changing the swinging angle of the brush head 20. In one embodiment, the regulating member 1231 is a torque spring, and the regulating member 1231 is a nut. An external thread is provided at one end of the third shaft segment 123 away from the second shaft segment 122. The torque spring is at least partially sleeved on the external thread, and the nut is threadedly connected to the third shaft segment 123. The nut displaces axially along the third shaft segment 123 to change the pre-tightening force of the torque spring.

[0061] The present utility model also proposes an electric toothbrush 1. The electric toothbrush 1 includes a movement assembly 10. The specific structure of the movement assembly 10 refers to the above embodiment. Since the electric toothbrush 1 adopts all the technical solutions of the above all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0062] The above are only the preferred embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A movement assembly, characterized in that: include: a bracket having a mounting slot; A transmission shaft is swingably disposed on the bracket, the transmission shaft comprises a first shaft section, a second shaft section and a third shaft section connected in sequence, at least a portion of the first shaft section is disposed outside the mounting groove and is used to connect with the brush head, the second shaft section and the third shaft section are both located in the mounting groove, at least two mounting holes are disposed on the second shaft section, the two mounting holes are spaced apart along the axial direction of the second shaft section, and magnets are disposed in the two mounting holes; A coil assembly, comprising a coil and a coil frame, wherein the coil frame is provided with a receiving groove extending radially through the transmission shaft, the coil is provided with an opening on one side radially along the transmission shaft, the coil frame is detachably connected to the bracket, the coil is located in the receiving groove and is covered outside the magnet, and the coil is used to drive the magnet to swing around the axial direction of the transmission shaft, so as to drive the transmission shaft to swing relative to the bracket; and A limit assembly is sleeved outside the third shaft segment, and the limit assembly is used to provide a torque opposite to the swing direction of the transmission shaft to the transmission shaft to limit the swing angle of the transmission shaft.

2. The movement assembly according to claim 1, characterized in that: The coil frame includes a detachably connected pressure cover and a fixing frame, the pressure cover is located on a side of the fixing frame away from the bracket, and the pressure cover, the fixing frame and the bracket are provided with interconnecting connecting holes, and the connecting parts pass through the connecting holes on the bracket, the fixing frame and the pressure cover in sequence to detachably connect the coil frame to the bracket.

3. The movement assembly according to claim 2, characterized in that: The pressure cover is provided with a first clamping portion, and the fixing frame is provided with a second clamping portion. The first clamping portion is extended along the radial direction of the transmission shaft, and the first clamping portion is clamped with the second clamping portion to connect the pressure cover and the fixing frame.

4. The movement assembly according to claim 3, characterized in that: The first clamping portion includes a clamping hook, and the second clamping portion is provided with a clamping groove, and the clamping hook is clamped in the clamping groove.

5. The movement assembly according to claim 1, characterized in that: A through hole communicating with the mounting groove is provided at one end of the bracket close to the third shaft segment, and a buffer is provided on the side of the bracket away from the first shaft segment. The buffer covers the through hole and is used to abut against the battery rack.

6. The movement assembly according to claim 1, characterized in that: The movement assembly also includes a bearing seat and a bearing installed in the bearing seat. The bearing sleeve is arranged outside the first shaft section and located in the installation groove. The bearing seat is at least partially located in the installation groove and connected to the bracket.

7. The movement assembly according to claim 1, characterized in that: The limiting assembly includes a fixing part and an elastic part, wherein the fixing part is sleeved outside the third shaft segment, the elastic part is arranged between the third shaft segment and the fixing part along the radial direction of the third shaft segment, a first fixing groove is arranged at one end of the fixing part away from the second shaft segment, an end of the elastic part away from the second shaft segment is connected to the third shaft segment, an end of the elastic part close to the second shaft segment is arranged in the first fixing groove and connected to the fixing part, and the elastic part is used to provide a torque to the transmission shaft that is opposite to the swing direction of the transmission shaft so as to limit the swing angle of the transmission shaft.

8. The movement assembly according to claim 7, characterized in that: The end of the third shaft segment away from the second shaft segment is axially extended with a second fixing groove, the second fixing groove is radially penetrated along the third shaft segment, and the end of the elastic member away from the second shaft segment is clamped in the second fixing groove.

9. The movement assembly according to claim 7, characterized in that: An adjusting member is provided on the third shaft segment, and the adjusting member is located on a side of the elastic member away from the second shaft segment. The adjusting member is tightly pressed against the elastic member and can move axially along the third shaft segment to adjust the torque provided by the elastic member.

10. An electric toothbrush, characterized in that: A movement assembly as claimed in any one of claims 1 to 9.

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