Motor assembly and electric toothbrush
By using high-frequency motor components in electric toothbrushes, using the high-frequency alternating magnetic field and the torque of elastic parts, the brushing action at high frequencies is achieved, solving the problem that existing electric toothbrushes cannot effectively clean deep plaque and tartars, and improving the tooth cleaning and massage effect.
Patent Information
- Application Number
- CN202421609514.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-09
AI Technical Summary
Existing electric toothbrushes use DC motors, which have low operating frequency and cannot effectively clean the deeper plaque and tartars.
The motor assembly including a bracket, a transmission shaft, a coil assembly and a limit assembly is adopted to generate a high-frequency alternating magnetic field through the high-frequency pulse square wave excitation coil assembly, which drives the transmission shaft to generate high-frequency swing, and combines the torque of the elastic member to limit the swing angle of the transmission shaft.
It realizes brushing at high frequency, can effectively clean plaque and calculus on the surface and deep gaps of teeth, and provides massage functions of cavitation and pulse effects to improve dental health.
Smart Images
Figure CN222928257U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric toothbrushes, and particularly relates to a motor assembly and an electric toothbrush. Background Art
[0002] At present, the common electric toothbrushes on the market use a DC motor as the power source, converting the rotational motion of the DC motor into a reciprocating motion, or directly connecting to an eccentric wheel to perform a rotational motion. Such electric toothbrushes have a low action frequency and poor performance, and cannot effectively clean deep dental plaque and dental calculus. Summary of the Utility Model
[0003] The main purpose of the utility model is to provide a motor assembly, aiming to improve the performance of the electric toothbrush.
[0004] To achieve the above purpose, the motor assembly proposed by the utility model includes:
[0005] A bracket having an installation groove;
[0006] A transmission shaft 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 inside the installation groove. At least two installation holes are provided 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 is open on one side along the radial direction of the transmission shaft. The coil assembly covers the magnet, and the coil assembly is used to drive the magnet to swing around the axial direction of the transmission shaft and drive the transmission shaft to swing relative to the bracket; and
[0008] A limiting assembly includes a fixing member and an elastic member. The fixing member is sleeved outside the third shaft section. The elastic member is arranged between the third shaft section and the fixing member along the radial direction of the third shaft section. 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. 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 limit the swinging angle of the transmission shaft.
[0009] 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.
[0010] In one embodiment, an adjusting member is provided on the third shaft segment. The adjusting member is located on a side of the elastic member away from the second shaft segment. The adjusting member abuts against the elastic member, and the adjusting member can move axially along the third shaft segment to adjust the magnitude of the torque provided by the elastic member.
[0011] In one embodiment, a plurality of fixing protrusions are provided in the mounting hole. The plurality of fixing protrusions are arranged along the inner edge of the mounting hole and are all in contact with the magnet.
[0012] In one embodiment, the second shaft segment is provided with a third fixing groove communicating with the mounting hole. An iron sheet is provided in the third fixing groove. The iron sheet is clamped with the second shaft segment and magnetically connected to the magnet, so that the magnet is fixed in the mounting hole.
[0013] In one embodiment, one end of the bracket close to the third shaft segment is provided with a through hole communicating with the mounting groove. A buffer member is provided outside a side of the bracket away from the first shaft segment. The buffer member covers the through hole and is used to abut against the battery holder.
[0014] In one embodiment, the motor assembly further includes a bearing seat and a bearing installed in the bearing seat. The bearing is sleeved outside the first shaft segment and is located in the mounting groove. At least part of the bearing seat is located in the mounting groove and is connected to the bracket.
[0015] In one embodiment, the coil assembly includes a silicon steel sheet group and a fixing frame. The fixing frame includes two connecting arms. The silicon steel sheet group is arranged between the two connecting arms. Both of the two connecting arms are connected to the bracket. A part of the silicon steel sheet group is located in the mounting groove and covers the magnet.
[0016] In one embodiment, limiting protrusions are provided at both ends of the second shaft segment close to the first shaft segment and the third shaft segment. The two ends of the fixing frame along the axial direction of the second shaft segment respectively abut against the limiting protrusions to limit the axial displacement of the transmission shaft.
[0017] The present utility model also proposes an electric toothbrush, which includes the motor 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; this 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, an elastic member connected to the transmission shaft and a fixed member always provides an elastic restoring force that keeps 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; in the actual use process, 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. 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 be obtained based on the structures shown in these drawings.
[0020] Figure 1 Structural schematic diagram of an embodiment of the motor assembly of the present utility model;
[0021] Figure 2 Structural schematic diagram of another embodiment of the motor assembly of the present utility model;
[0022] Figure 3 Structural schematic diagram of yet another embodiment of the motor assembly of the present utility model;
[0023] Figure 4 Structural schematic diagram of still another embodiment of the motor assembly of the present utility model.
[0024] Explanation of the reference numerals in the drawings:
[0025] 1 - Electric toothbrush, 10 - Motor assembly, 20 - Brush head, 30 - Battery holder;
[0026] 11 - Bracket, 11a - Installation groove, 11b - Through hole, 112 - Buffer member;
[0027] 12 - Transmission shaft, 121 - First shaft section, 122 - Second shaft section, 122a - Installation hole, 1221 - Magnet, 1223 - Iron sheet, 1224 - Fixed protrusion, 1225 - Limit protrusion, 123 - Third shaft section, 123a - Second fixing groove, 1231 - Adjusting member;
[0028] 13 - Coil assembly, 131 - Silicon steel sheet group, 132 - Fixed bracket, 1321 - Connecting arm;
[0029] 14 - Limit component, 141 - Fixing part, 141a - First fixing groove, 142 - Elastic part;
[0030] 15 - Bearing seat, 151 - Bearing.
[0031] 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
[0032] 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 creative efforts shall fall within the protection scope of the present utility model.
[0033] 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 position 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.
[0034] 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 fact that those of ordinary skill in the art can implement them. 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.
[0035] Currently, the common electric toothbrushes on the market use a DC motor as the power source, converting the rotational motion of the DC motor into a reciprocating motion, or directly connecting to an eccentric wheel for rotational motion. Such electric toothbrushes have a low action frequency and poor performance, and cannot effectively clean deep - layer dental plaque and dental calculus.
[0036] To solve the above problems, please refer to Figures 1 to 4 , the present utility model provides a motor assembly 10, which includes:
[0037] Bracket 11, having a mounting groove 11a;
[0038] Drive shaft 12, swingably arranged on bracket 11. The drive shaft 12 includes a first shaft section 121, a second shaft section 122 and a third shaft section 123 connected in sequence. At least part of the first shaft section 121 is arranged outside the mounting groove 11a and is used to connect with the brush 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 arranged at intervals along the axial direction of the second shaft section 122. Magnets are provided in both of the two mounting holes 122a;
[0039] Coil assembly 13, with an opening on one side along the radial direction of the drive shaft 12. The coil assembly 13 covers the magnet. The coil assembly 13 is used to drive the magnet to swing around the axial direction of the drive shaft 12 and drive the drive shaft 12 to swing relative to the bracket 11; and
[0040] Limit component 14, including a fixing part 141 and an elastic part 142. The fixing part 141 is sleeved outside the third shaft section 123. The elastic part 142 is arranged along the radial direction of the third shaft section 123 between the third shaft section 123 and the fixing part 141. A first fixing groove 141a is provided at one end of the fixing part 141 away from the second shaft section 122. One end of the elastic part 142 away from the second shaft section 122 is connected to the third shaft section 123. One end of the elastic part 142 close to the second shaft section 122 is arranged in the first fixing groove 141a and is connected to the fixing part 141. The elastic part 142 is used to provide a torque to the drive shaft 12 in the direction opposite to the swinging direction of the drive shaft 12 to limit the swinging angle of the drive shaft 12.
[0041] In this embodiment, the coil assembly 13 is electrically connected to the circuit board. 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 the magnet fixed on the drive shaft 12, thereby driving the drive shaft 12 to generate high-frequency swinging. At this time, the elastic part 142 connected to the drive shaft 12 and the fixing part 141 always provides an elastic restoring force to keep the drive shaft 12 in the balanced position, that is, provides a torque to the drive shaft 12 in the direction opposite to the swinging direction of the drive shaft 12. Therefore, the swinging of the drive shaft 12 is not 360°, but swings 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; in the actual use process, 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 the health of the teeth.
[0042] In the embodiment of the present utility model, please refer to Figure 2 and Figure 4, at one end of the third shaft segment 123 away from the second shaft segment 122, a second fixing groove 123a is axially extended. The second fixing groove 123a is radially penetrated through the third shaft segment 123. One end of the elastic member 142 away from the second shaft segment 122 is clamped in the second fixing groove 123a.
[0043] 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 is radially penetrated through the third shaft segment 123, 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 along 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 torsion spring. When the transmission shaft 12 makes high-frequency swings, the torsion spring can provide a resilience force opposite to the swinging direction. This design can make the brushing action have a torsion force for rebound reset.
[0044] In an embodiment of the present invention, please refer to Figure 2 and Figure 4 , an adjusting member is provided on the third shaft segment 123. The adjusting member is located on the side of the elastic member 142 away from the second shaft segment 122. The adjusting member abuts against the elastic member 142. The adjusting member can move axially along the third shaft segment 123 to adjust the magnitude of the torque provided by the elastic member 142.
[0045] In this embodiment, the adjusting member moves axially along the third shaft segment 123 in a direction close to or away 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 adjusting member changes the pre-tightening resilience 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 adjusting member is a torsion spring, and the adjusting member is a nut. An external thread is provided at one end of the third shaft segment 123 away from the second shaft segment 122. At least part of the torsion spring is sleeved on the external thread. 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 torsion spring.
[0046] In an embodiment of the present invention, please refer to Figure 2 and Figure 4 , a plurality of fixing protrusions 1221 are provided in the mounting hole 122a. The plurality of fixing protrusions 1221 are arranged along the inner edge of the mounting hole 122a and are all in contact with the magnet.
[0047] In this embodiment, in order to facilitate the installation of the magnet, a plurality of fixing protrusions 1221 are provided in the installation hole 122a. The magnet is snap-fitted in the installation hole 122a. At the same time, since the fixing protrusions 1221 are in contact with the magnet, the contact area between the second shaft section 122 and the magnet is reduced, and the collision area between the magnet and the second shaft section 122 during the swinging process is reduced, thereby reducing the resonance noise between the magnet and the second shaft section 122.
[0048] In an embodiment of the present utility model, please refer to Figure 2 and Figure 4 , a third fixing groove communicating with the installation hole 122a is provided in the second shaft section 122. An iron sheet is provided in the third fixing groove. The iron sheet is snap-fitted with the second shaft section 122 and magnetically connected to the magnet, so that the magnet is fixed in the installation hole 122a.
[0049] In this embodiment, in order to further fix the magnet and improve the interaction between the magnet and the coil assembly at the same time, iron sheets are provided on both sides of the magnet. This structural design can firmly fix the magnet inside the second shaft section 122 without loosening, and is beneficial to assembly and manufacturing. The iron sheet can also enhance the interaction between the magnetic field generated by the coil assembly 13 and the magnet, further improving the brushing effect. It should be noted that in this embodiment, an iron sheet with a relatively low cost is used. In other embodiments, the iron sheet can be other metal sheets, such as silver sheets, copper sheets, etc.
[0050] In an embodiment of the present utility model, please refer to Figure 2 and Figure 3 , a through hole 11b communicating with the installation groove 11a is provided at one end of the bracket 11 close to the third shaft section 123. 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.
[0051] In this embodiment, in order to reduce the noise generated when the motor assembly 10 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 motor assembly 10 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 noise. In one embodiment, the buffer member 112 is made of silicone or rubber with good elasticity.
[0052] In an embodiment of the present utility model, please refer to Figure 2 and Figure 4, the motor 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.
[0053] In an embodiment of the present invention, please refer to Figure 2 and Figure 4 , the coil assembly 13 includes a silicon steel sheet group 131 and a fixing frame 132. The fixing frame 132 includes two connecting arms 113. The silicon steel sheet group 131 is arranged between the two connecting arms 113. Both connecting arms 113 are connected to the fixing frame 132. Part of the silicon steel sheet group 131 is located in the installation groove 11a and covers the outside of the magnet.
[0054] Furthermore, in order to improve the interaction between the coil assembly 13 and the magnet, the silicon steel sheet group 131 is used in cooperation with the magnet to improve the brushing effect of the electric toothbrush 1. In one embodiment, the silicon steel sheet group 131 is arranged in an open shape and covers the outside of the magnet, that is, the silicon steel sheet group 131 semi-surrounds the outside of the magnet to realize the interaction between the silicon steel sheet group 131 and the magnet.
[0055] In an embodiment of the present invention, please refer to Figure 4 , both ends of the second shaft section 122 close to the first shaft section 121 and the third shaft section 123 are provided with limit protrusions 1223. The two ends of the fixing frame 132 along the axial direction of the second shaft section 122 are respectively abutted against the limit protrusions 1223 to limit the axial displacement of the transmission shaft 12.
[0056] In this embodiment, in order to limit the axial displacement of the transmission shaft 12 when the transmission shaft 12 swings, limit protrusions 1223 are respectively provided at both ends of the second shaft section 122 to abut against the fixing frame 132. The position of the limit protrusions 1223 can be adjusted according to the specific size of the fixing frame 132 to achieve the effect of limiting the axial displacement of the transmission shaft 12.
[0057] The present invention also proposes an electric toothbrush 1. The electric toothbrush 1 includes a motor assembly 10. The specific structure of the motor assembly 10 refers to the above embodiment. Since this 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, and will not be elaborated here one by one.
[0058] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A motor 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, which is opened along one side of the radial direction of the transmission shaft, and covers the magnet, and is used to drive the magnet to swing around the axial direction of the transmission shaft, and drive the transmission shaft to swing relative to the bracket; and A limiting assembly includes a fixing member and an elastic member, wherein the fixing member is sleeved outside the third shaft segment, the elastic member is arranged between the third shaft segment and the fixing member along the radial direction of the third shaft segment, a first fixing groove is provided at one end of the fixing member away from the second shaft segment, the end of the elastic member away from the second shaft segment is connected to the third shaft segment, the end of the elastic member close to the second shaft segment is arranged in the first fixing groove and connected to the fixing member, and the elastic member is used to provide a torque to the transmission shaft that is opposite to the swing direction of the transmission shaft to limit the swing angle of the transmission shaft.
2. The motor assembly according to claim 1, wherein: 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.
3. The motor assembly according to claim 1, wherein: 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.
4. The motor assembly according to claim 1, wherein: A plurality of fixing protrusions are arranged in the mounting hole, and the plurality of fixing protrusions are arranged along the inner edge of the mounting hole and are all in contact with the magnet.
5. The motor assembly according to claim 1, wherein: The second shaft section is provided with a third fixing groove connected with the mounting hole, and an iron sheet is provided in the third fixing groove. The iron sheet is clamped with the second shaft section and is magnetically connected with the magnet so that the magnet is fixed in the mounting hole.
6. The motor assembly according to claim 1, wherein: 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.
7. The motor assembly according to claim 1, wherein: The motor 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.
8. The motor assembly according to claim 1, wherein: The coil assembly includes a silicon steel sheet group and a fixing frame, the fixing frame includes two connecting arms, the silicon steel sheet group is arranged between the two connecting arms, the two connecting arms are both connected to the bracket, and part of the silicon steel sheet group is located in the installation groove and is covered outside the magnet.
9. The motor assembly according to claim 8, characterized in that Both ends of the second shaft segment close to the first shaft segment and the third shaft segment are provided with limiting protrusions, and both ends of the fixing frame along the axial direction of the second shaft segment are respectively in contact with the limiting protrusions to limit the axial displacement of the transmission shaft.
10. An electric toothbrush, characterized in that: Comprising a motor assembly as claimed in any one of claims 1 to 9.