Acoustic motor and electric toothbrush

Abstract

The utility model relates to a kind of acoustic motor, comprising: cabinet, setting with accommodating cavity in cabinet;Coil assembly, fixed in accommodating cavity, coil assembly generates magnetic field when electrified;Shaft, set in accommodating cavity and pass through coil assembly, the surface of shaft is fixed with magnetic piece corresponding coil assembly, magnetic piece moves under the action of magnetic field, and drive shaft reciprocating rotation;Transmission member, fixed in cabinet, transmission member and the transmission cooperation of one end of shaft, the cooperation structure between transmission member and shaft is configured as under the action of shaft reciprocating rotation, transmission member pushes shaft synchronous reciprocating extension and contraction along its axial motion.The shaft of the utility model of acoustic motor has reciprocating rotation and reciprocating extension and contraction compound motion when working, improve the cleaning effect when acoustic motor is applied to electric toothbrush, simultaneously without additional increase driving device drive shaft reciprocating extension and contraction, structure is more simple.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a sonic motor and an electric toothbrush. Background Technology

[0002] An electric toothbrush is an oral hygiene tool powered by electricity. It uses a built-in motor to drive the brush head to rotate or vibrate at high frequencies, replacing traditional manual brushing and achieving efficient and convenient teeth cleaning. Rotary toothbrushes are simple in principle; a motor drives a circular brush head to rotate. Vibrating electric toothbrushes are more complex. They contain an electrically driven vibrating motor that causes the brush head to oscillate at high frequencies perpendicular to the handle.

[0003] Existing vibrating toothbrushes are usually driven by sonic motors. However, when existing sonic motors oscillate at high frequencies, they only oscillate in the direction perpendicular to the axis, resulting in a single action and incomplete or inadequate cleaning effect. Utility Model Content

[0004] In view of the above problems, this utility model provides a sonic motor to solve the technical problem that the existing sonic motors have a single action, resulting in incomplete and inadequate cleaning effect.

[0005] This utility model provides a sonic motor, comprising: a housing with a receiving cavity inside; a coil assembly fixed in the receiving cavity, which generates a magnetic field when energized; a rotating shaft disposed in the receiving cavity and passing through the coil assembly, wherein a magnetic element is fixedly disposed on the surface of the rotating shaft corresponding to the coil assembly, the magnetic element moving under the action of the magnetic field and driving the rotating shaft to reciprocate; and a transmission member fixed in the housing, which is in transmission engagement with one end of the rotating shaft, wherein the engagement structure between the transmission member and the rotating shaft is configured such that, under the action of the reciprocating rotation of the rotating shaft, the transmission member pushes the rotating shaft to synchronously reciprocate and extend along its axial direction.

[0006] In one alternative embodiment, a driving member is fixedly disposed at one end of the rotating shaft corresponding to the transmission member. The driving member extends toward the transmission member to form a driving shaft. A driving cavity is disposed inside the transmission member. The driving member is located in the driving cavity. A track groove is disposed on the inner wall of the driving cavity. The driving shaft slides in conjunction with the track groove. The track groove extends from one end to the other along the circumferential and axial directions of the rotating shaft.

[0007] In one alternative embodiment, the drive element further includes a rolling element, which is sleeved on the end of the drive shaft away from the rotating shaft. The rolling element rolls in cooperation with the track groove, and when the rotating shaft reciprocates, the rolling element rolls relative to the side wall of the track groove.

[0008] In one alternative embodiment, the outer periphery of the rolling element is fitted with a soft rubber sleeve, through which the rolling element contacts the track groove.

[0009] In one alternative embodiment, the rolling element is a first bearing, the inner ring of which is interference-fitted with the drive shaft, and the outer ring of which is rolling-fitted with the track groove.

[0010] In one alternative embodiment, two drive shafts are symmetrically arranged on opposite sides of the drive member, and a track groove is provided on the inner wall of the drive cavity for each drive shaft.

[0011] In one alternative embodiment, the transmission component includes a first housing and a second housing, which are sequentially arranged along the axial direction of the rotating shaft, and are joined together to form the track groove.

[0012] In one alternative embodiment, the wall of the track groove is fixedly provided with a soft rubber part that mates with the drive component.

[0013] In one alternative embodiment, a second bearing and a third bearing are fitted onto the rotating shaft, the second bearing and the third bearing being spaced apart, the second bearing and the third bearing being installed within the accommodating cavity, and the rotating shaft being movable relative to the inner rings of the second bearing and the third bearing, respectively.

[0014] In one alternative embodiment, the third bearing is located between the second bearing and the drive member, the third bearing is spaced apart from the drive member, and a spring is provided between the third bearing and the drive member, with both ends of the spring abutting against the third bearing and the drive member, respectively.

[0015] In one alternative embodiment, the surface of the rotating shaft near one end of the transmission member is recessed with a track groove, the track groove extending from one end to the other along the circumferential and axial directions of the rotating shaft, and the transmission member having a drive shaft extending toward the track groove, the drive shaft slidingly engaging with the track groove.

[0016] In one alternative embodiment, the track groove includes a first groove segment and a second groove segment, with one end of the first groove segment and the second groove segment connected to each other to form a "V" shape. When the rotating shaft is in the middle position during the reciprocating rotation process, the drive shaft is located at the connection point of the first groove segment and the second groove segment.

[0017] In one alternative embodiment, the end of the drive shaft that mates with the track groove is spherical.

[0018] This utility model also provides an electric toothbrush, including the above-mentioned sonic motor and brush handle, wherein one end of the brush handle is provided with bristles, and the other end is connected to the end of the rotating shaft away from the transmission component.

[0019] This invention incorporates a transmission component on the housing of a sonic motor. This transmission component engages with one end of a rotating shaft. The connection between the transmission component and the rotating shaft is designed such that, under the reciprocating rotation of the shaft, the transmission component drives the shaft to synchronously reciprocate and extend along its axial direction. This results in a composite motion of reciprocating rotation and reciprocating extension during operation, increasing the complexity of the sonic motor's motion and avoiding the problem of incomplete or inadequate cleaning when applied to electric toothbrushes due to the singular motion of the sonic motor. This improves the cleaning effect of the sonic motor when used in electric toothbrushes, while eliminating the need for an additional drive device to drive the shaft in reciprocating extension and retraction, thus simplifying the structure.

[0020] 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

[0021] 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:

[0022] Figure 1 This is a structural diagram of the present invention in its assembled state.

[0023] Figure 2 This is a schematic diagram of the structure of the present invention in its disassembled state.

[0024] Figure 3 This is a schematic diagram of the internal structure of this utility model.

[0025] Figure 4 This is a cross-sectional view of the present invention.

[0026] Figure 5 This is a schematic diagram of one embodiment of the trajectory groove in this utility model.

[0027] Figure 6 This is a schematic diagram of another embodiment of the trajectory groove in this utility model.

[0028] Figure 7 This is a schematic diagram of another embodiment of the trajectory groove in this utility model.

[0029] Figure 8 This is a schematic diagram of another embodiment of the trajectory groove in this utility model.

[0030] Figure 9 This is a schematic diagram of another embodiment of the trajectory groove in this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10. Acoustic motor; 1. Housing; 11. Receiving cavity; 2. Coil assembly; 3. Rotating shaft; 31. Magnetic component; 4. Transmission component; 41. First housing; 42. Second housing; 43. Drive cavity; 44. Track groove; 441. First groove segment; 442. Second groove segment; 5. Drive component; 51. Drive shaft; 52. Rolling component; 53. Soft rubber sleeve; 54. Snap-fit ​​component; 6. Second bearing; 7. Third bearing; 8. Spring; 9. Soft rubber component. Detailed Implementation

[0033] 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.

[0034] Please see Figures 1 to 9 As shown, this utility model provides a sonic motor 10, including: a housing 1, wherein a receiving cavity 11 is provided inside the housing 1; a coil assembly 2, fixed in the receiving cavity 11, wherein the coil assembly 2 generates a magnetic field when energized; a rotating shaft 3, disposed in the receiving cavity 11 and passing through the coil assembly 2, wherein a magnetic element 31 is fixedly disposed on the surface of the rotating shaft 3 corresponding to the coil assembly 2, wherein the magnetic element 31 moves under the action of the magnetic field and drives the rotating shaft 3 to reciprocate; the working principle of the sonic motor (also called a sonic motor) can be referred to the prior art and will not be described in detail here; and a transmission component 4, fixed in the housing 1, wherein the transmission component 4 is in transmission cooperation with one end of the rotating shaft 3, wherein the cooperation structure between the transmission component 4 and the rotating shaft 3 is configured such that, under the action of the reciprocating rotation of the rotating shaft 3, the transmission component 4 pushes the rotating shaft 3 to reciprocate and extend synchronously along its axial direction.

[0035] This invention provides a transmission component 4 on the housing 1 of the sonic motor 10. The transmission component 4 is connected to one end of the rotating shaft 3. The connection between the transmission component 4 and the rotating shaft 3 is designed such that, under the reciprocating rotation of the rotating shaft 3, the transmission component drives the rotating shaft 3 to reciprocate and extend synchronously along its axial direction. This results in the rotating shaft 3 having a composite motion of reciprocating rotation and reciprocating extension when working, which increases the motion complexity of the sonic motor 10 and avoids the problem of incomplete or inadequate cleaning effect when applied to an electric toothbrush due to the single motion of the sonic motor 10. This improves the cleaning effect of the sonic motor 10 when applied to an electric toothbrush. At the same time, it eliminates the need for an additional drive device to drive the rotating shaft 3 to reciprocate and extend, making the structure simpler.

[0036] Reference Figures 2 to 5 As shown in the figure, in one embodiment of the present invention, a driving member 5 is fixedly provided at one end of the rotating shaft 3 corresponding to the transmission member 4. The driving member 5 can be provided with an assembly hole and is sleeved on the rotating shaft 3 through the assembly hole. The driving member 5 can be fixed on the rotating shaft 3 by screws or interference fit. The driving member 5 extends toward the transmission member 4 to form a driving shaft 51. A driving cavity 43 is provided inside the transmission member 4. The driving member 5 is located in the driving cavity 43. A track groove 44 is provided on the inner wall of the driving cavity 43. The driving shaft 51 is slidably engaged with the track groove 44. The track groove 44 extends from one end to the other along the circumferential and axial directions of the rotating shaft 3, so that when the driving shaft 51 slides on the track groove 44, it can push the rotating shaft 3 to perform reciprocating extension and retraction motion.

[0037] Furthermore, in order to reduce the noise when the drive shaft 51 slides on the track groove 44, the drive component 5 also includes a rolling element 52. The rolling element 52 is sleeved on the end of the drive shaft 51 away from the rotating shaft 3. The rolling element 52 rolls in cooperation with the track groove 44. When the rotating shaft 3 reciprocates, the rolling element 52 rolls relative to the side wall of the track groove 44. Since the noise generated during mechanical movement can be greatly reduced when the drive shaft 51 slides relative to the track groove 44, the rolling element 52 rolls on the side wall of the track groove 44.

[0038] Similarly, please refer to Figure 8 As shown, in order to further reduce the noise generated when the drive shaft 51 slides relative to the track groove 44, a soft rubber sleeve 53 is provided on the outer periphery of the rolling element 52. The rolling element 52 contacts the track groove 44 through the soft rubber sleeve 53. The soft rubber sleeve 53 is annular, and the rolling element 52 is circumferentially recessed with an assembly groove for assembling the soft rubber sleeve 53. The soft rubber sleeve 53 is fitted into the assembly groove, so that the soft rubber sleeve 53 is not easy to fall off during the movement. The soft rubber sleeve 53 can play a shock-absorbing role, thereby reducing the noise generated during mechanical movement.

[0039] Optionally, the rolling element 52 is a first bearing, and the inner ring of the first bearing is interference-fitted with the drive shaft 51, thereby fixing the first bearing to the drive shaft 51. Of course, it can also be as follows: Figure 8 As shown, a snap-fit ​​member 54 is provided at the end of the drive shaft 51. The snap-fit ​​member 54 is snapped onto the drive shaft 51, thereby preventing the first bearing from disengaging from the drive shaft 51. The outer ring of the first bearing is in rolling engagement with the track groove 44. Of course, the rolling element 52 can also be a roller. When the drive shaft 51 slides relative to the track groove 44, it drives the roller to roll into rolling engagement with the track groove 44.

[0040] In order to make the force more uniform when the drive shaft 51 pushes the rotating shaft 3 to perform telescopic movement, and to avoid the drive shaft 51 being prone to breakage due to uneven force, two drive shafts 51 are symmetrically arranged on opposite sides of the drive component 5, and a track groove 44 is respectively provided on the inner wall of the drive cavity 43 for each drive shaft 51.

[0041] Furthermore, refer to Figure 2 and Figure 7 As shown, in order to make it easier to assemble the drive shaft 51 onto the transmission component during assembly, the transmission component 4 includes a first housing 41 and a second housing 42. The first housing 41 and the second housing 42 are arranged sequentially along the axial direction of the rotating shaft 3. The first housing 41 and the second housing 42 are spliced ​​together to form the track groove 44. During assembly, the first housing 41 is first sleeved on the rotating shaft 3 and fixed relative to the housing 1. Then, the drive component 5 is assembled and fixed on the rotating shaft 3. Finally, the second housing 42 is assembled on the first housing 41 and fixed on the housing 1. The drive cavity 43 formed by the first housing 41 and the second housing 42 accommodates the drive component 5, and the drive shaft 51 and the track groove 44 are fitted together.

[0042] Reference Figure 9 As shown, in order to further reduce the noise generated when the drive shaft 51 slides relative to the track groove 44, a soft rubber part 9 that cooperates with the drive component 5 is fixedly provided on the wall of the track groove 44. Since the rolling component 52 mainly rolls on the side wall of the track groove 44 when it rolls in the track groove 44, the soft rubber part 9 is made as follows. Figure 9 The ring shown matches the shape of the side wall of the track groove 44, thus saving material. Of course, the soft rubber part 9 can also completely cover the surface of the track groove 44. The soft rubber part 9 can be fixed in the track groove 44 by means of adhesive or screw connection.

[0043] Reference Figure 4As shown, a second bearing 6 and a third bearing 7 are sleeved on the rotating shaft 3. The second bearing 6 and the third bearing 7 are spaced apart and installed in the accommodating cavity 11. The second bearing 6 and the third bearing 7 can position the rotating shaft 3, keeping it in a relatively fixed position relative to the coil assembly 2. At the same time, they can also reduce the mechanical friction generated when the rotating shaft 3 rotates. The rotating shaft 3 is movable relative to the inner rings of the second bearing 6 and the third bearing 7, thereby allowing the rotating shaft 3 to extend and retract along its axial direction.

[0044] Furthermore, refer to Figure 4 As shown, the third bearing 7 is located between the second bearing 6 and the driving member 5. The third bearing 7 and the driving member 5 are spaced apart. In order to reduce the movement clearance of the driving shaft 51 in the track groove 44, thereby reducing the noise generated when the driving shaft 51 slides relative to the track groove 44, a spring 8 is provided between the third bearing 7 and the driving member 5. The two ends of the spring 8 abut against the third bearing 7 and the driving member 5 respectively.

[0045] In another embodiment of this utility model, the surface of the rotating shaft 3 near the end of the transmission member 4 is recessed with a track groove (not shown). The track groove extends from one end to the other along the circumferential and axial directions of the rotating shaft 3. The transmission member 4 has a drive shaft (not shown) extending toward the track groove. The drive shaft slides in cooperation with the track groove. When the drive shaft slides on the track groove, it pushes the rotating shaft 3 to reciprocate and extend along its own axial direction.

[0046] Reference Figure 6 As shown, in one optional embodiment, the track groove 44 includes a first groove segment 441 and a second groove segment 442. One end of the first groove segment 441 and the second groove segment 442 are connected to each other to form a "V" shape. When the rotating shaft 3 is in the middle position during the reciprocating rotation process, the drive shaft 51 is located at the connection between the first groove segment and the second groove segment 442. The "V" shaped track groove allows the drive shaft to push the rotating shaft 3 to perform reciprocating extension and retraction motion along its axial direction during both forward and reverse rotation of the rotating shaft 3 around its axial direction, thereby improving the symmetry of the mechanical motion. For example, when the rotating shaft 3 rotates forward around its axial direction, the drive shaft moves in the first groove segment 441 and drives the rotating shaft 3 to perform reciprocating extension and retraction motion. When the rotating shaft 3 rotates backward around its axial direction, the drive shaft moves in the second groove segment 442 and similarly drives the rotating shaft 3 to perform reciprocating extension and retraction motion.

[0047] Additionally, refer to Figure 3As shown, in one optional embodiment, the end of the drive shaft 51 that mates with the track groove 44 is spherical. Setting the end of the drive shaft 51 to be spherical makes the end surface of the drive shaft 51 smoother, reduces friction when the drive shaft 51 slides in the track groove, and thus reduces motion noise.

[0048] This utility model also provides an electric toothbrush, including the aforementioned sonic motor 10 and a brush handle. One end of the brush handle is provided with bristles, and the other end is connected to the end of the rotating shaft 3 away from the transmission member 4. (Refer to...) Figure 1 As shown, one end of the rotating shaft 3 connected to the brush rod can extend out of the housing 1, which facilitates assembly with the brush rod. At the same time, a snap-fit ​​structure can be provided at the end of the rotating shaft 3 so that the brush rod will not rotate after being assembled on the rotating shaft 3.

[0049] In the description of this embodiment of the present invention, 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", "circumferential", etc., 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 the present invention 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 the present invention.

[0050] 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.

[0051] In the description of this embodiment of the invention, 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. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0052] In the description of this embodiment of the invention, 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.

[0053] 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 sound wave motor, characterized in that, include: A housing, wherein a receiving cavity is provided inside the housing; A coil assembly is fixed in the accommodating cavity, and the coil assembly generates a magnetic field when energized. A rotating shaft is disposed within the accommodating cavity and passes through the coil assembly. A magnetic element is fixedly disposed on the surface of the rotating shaft corresponding to the coil assembly. The magnetic element moves under the action of the magnetic field and drives the rotating shaft to reciprocate. A transmission component is fixed to the housing. The transmission component is in transmission engagement with one end of the rotating shaft. The engagement structure between the transmission component and the rotating shaft is configured such that, under the reciprocating rotation of the rotating shaft, the transmission component drives the rotating shaft to reciprocate and extend synchronously along its axial direction. A driving component is fixedly provided at one end of the rotating shaft corresponding to the transmission component. The driving component extends toward the transmission component to form a driving shaft. A driving cavity is provided inside the transmission component. The driving component is located in the driving cavity. A track groove is provided on the inner wall of the driving cavity. The driving shaft is in sliding engagement with the track groove. The track groove extends from one end to the other along the circumferential and axial directions of the rotating shaft.

2. The acoustic motor according to claim 1, characterized in that, The driving component also includes a rolling element, which is sleeved on the end of the driving shaft away from the rotating shaft. The rolling element rolls in cooperation with the track groove. When the rotating shaft reciprocates, the rolling element rolls relative to the side wall of the track groove.

3. The acoustic motor according to claim 2, characterized in that, The outer periphery of the rolling element is fitted with a soft rubber sleeve, and the rolling element contacts the track groove through the soft rubber sleeve.

4. The acoustic motor according to claim 2, characterized in that, The rolling element is a first bearing, the inner ring of the first bearing is interference-fitted with the drive shaft, and the outer ring of the first bearing is rolling-fitted with the track groove.

5. The acoustic motor according to any one of claims 1 to 4, characterized in that, The driving component has two driving shafts symmetrically arranged on opposite sides, and the inner wall of the driving cavity is provided with a track groove corresponding to each driving shaft.

6. The acoustic motor according to any one of claims 1 to 4, characterized in that, The transmission component includes a first housing and a second housing, which are arranged sequentially along the axial direction of the rotating shaft, and are joined together to form the track groove.

7. The acoustic motor according to any one of claims 1 to 4, characterized in that, The wall of the track groove is fixedly provided with a soft rubber part that cooperates with the drive component.

8. The acoustic motor according to any one of claims 1 to 4, characterized in that, The rotating shaft is fitted with a second bearing and a third bearing, which are spaced apart and installed in the accommodating cavity. The rotating shaft is movable relative to the inner rings of the second and third bearings, respectively.

9. The acoustic motor according to claim 8, characterized in that, The third bearing is located between the second bearing and the driving member, and the third bearing is spaced apart from the driving member. A spring is provided between the third bearing and the driving member, and the two ends of the spring abut against the third bearing and the driving member, respectively.

10. The acoustic motor according to claim 1, characterized in that, The surface of the rotating shaft near one end of the transmission member is recessed with a track groove. The track groove extends from one end to the other along the circumferential and axial directions of the rotating shaft. The transmission member has a drive shaft extending in the direction of the track groove, and the drive shaft slides in conjunction with the track groove.

11. The acoustic motor according to any one of claims 1-4, 10, characterized in that, The track groove includes a first groove segment and a second groove segment. One end of the first groove segment and the second groove segment are connected to each other to form a "V" shape. When the rotating shaft is in the middle position during the reciprocating rotation process, the drive shaft is located at the connection between the first groove segment and the second groove segment.

12. The acoustic motor according to claim 1 or 10, characterized in that, The end of the drive shaft that mates with the track groove is spherical.

13. An electric toothbrush, characterized in that, The invention includes the acoustic motor and brush rod as described in any one of claims 1-12, wherein one end of the brush rod is provided with bristles and the other end is connected to the end of the rotating shaft away from the transmission member.

Images