Two-degree-of-freedom sweep vibration motor with high vibration frequency

Abstract

The utility model relates to the technical field of motors, in particular to a high-vibration-frequency two-degree-of-freedom sweep vibration motor, which comprises a casing and an inner shaft branch. An upper end cover is arranged on the top of the machine shell. An elastic sheet assembly is arranged at the bottom of the shell; a sweeping vibration assembly and a telescopic assembly are arranged in the machine shell. A sliding sleeve bearing is arranged between the top of the inner shaft branch and the upper end cover; the elastic sheet assembly comprises an elastic sheet frame and an elastic sheet piece; the elastic piece comprises an annular positioning part, an annular deformation part and an annular fixing part. The elastic piece assembly is arranged at the bottom of the machine shell, when the inner shaft branch rotates left and right, relative rotation between the inner shaft branch and the elastic piece assembly is achieved due to the arrangement of the rotating bearing, namely, rotation of the inner shaft branch does not cause movement of the elastic piece assembly, and when the inner shaft branch stretches out and draws back up and down, the elastic piece assembly does not move. The inner shaft branch drives the annular fixing part to move up and down through the rotating bearing, so that the annular deformation part generates elastic deformation, and the vibration frequency of the inner shaft branch can be improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a high-frequency, two-degree-of-freedom sweeping motor. Background Technology

[0002] In the electric toothbrush industry, drive technology is the core element for achieving its cleaning function. Current electric toothbrushes commonly use rotary motors, magnetic levitation motors, and sonic motors as drive sources to achieve different driving modes. However, when the motor needs to perform both sweeping and telescopic movements (two degrees of freedom), the mainstream solution is to integrate two motors, one for sweeping and the other for telescopic movement. While this design achieves the desired functionality, it has several drawbacks. It not only leads to a complex overall structure, increasing manufacturing and assembly difficulties, but also significantly raises production costs. Furthermore, its structural stability is poor, making it prone to malfunctions during use.

[0003] Furthermore, a common industry practice to improve the stability between the rotating shaft and the housing is to install a sliding bearing between them. However, this method has significant limitations, severely restricting the frequency of the rotating shaft's vertical extension and retraction vibrations, failing to meet users' needs for efficient cleaning, and affecting the cleaning effect and user experience of the electric toothbrush. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing a high-frequency, dual-degree-of-freedom sweeping motor.

[0005] The purpose of this utility model is achieved through the following technical solution: a high vibration frequency dual-degree-of-freedom sweeping motor, including a housing and an inner shaft; the top of the housing is provided with an upper end cover; the bottom of the housing is provided with a spring sheet assembly; the housing is provided with a sweeping assembly and a telescopic assembly along its length.

[0006] A sliding bearing is provided between the top of the inner shaft branch and the upper end cover;

[0007] The spring assembly includes a spring frame and a spring component; the spring component includes an annular positioning part, an annular deformation part, and an annular fixing part arranged concentrically; the spring frame is fixedly disposed at the bottom of the housing; the annular positioning part is fixedly disposed at the spring frame; the annular deformation part is disposed within the annular positioning part; the annular fixing part is disposed within the annular deformation part; a first connecting rib is provided between the annular deformation part and the annular positioning part; a second connecting rib is provided between the annular deformation part and the annular fixing part; a rotating bearing is fixedly disposed within the annular fixing part; the bottom of the inner shaft is fixedly disposed within the rotating bearing.

[0008] The present invention is further configured such that the sliding sleeve bearing includes an outer steel sleeve, an inner steel sleeve and an inner sliding sleeve; the outer steel sleeve is fixedly disposed inside the upper end cover; the inner steel sleeve is movably disposed inside the outer steel sleeve; the inner sliding sleeve is disposed between the inner steel sleeve and the outer steel sleeve; and the inner shaft is fixedly sleeved inside the inner steel sleeve.

[0009] The present invention is further configured such that: the top of the upper end cover is provided with an upper baffle plate; the upper baffle plate is provided with an upper through hole; the inner steel sleeve is provided through the upper through hole; the inner shaft is provided with an upper oil baffle sleeve inside the housing; and the inner sliding sleeve is provided between the upper baffle plate and the upper oil baffle sleeve.

[0010] The present invention is further configured such that: the number of the first connecting ribs is two; the two first connecting ribs are symmetrically arranged with respect to the center of the annular deformation portion; the number of the second connecting ribs is two; and the two second connecting ribs are symmetrically arranged with respect to the center of the annular deformation portion.

[0011] The present invention is further configured such that the diameters of the two first connecting ribs are perpendicular to the diameters of the two second connecting ribs.

[0012] The present invention is further configured such that the annular positioning part, the annular deformation part, the annular fixing part, the first connecting rib, and the second connecting rib are integrally injection molded.

[0013] The present invention is further configured such that the rotating bearing is a ball bearing.

[0014] The present invention is further configured such that the material of the spring holder is POM plastic; and the material of the spring component is PEEK plastic.

[0015] The present invention is further configured such that the sweeping vibration assembly includes a first fixed iron core disposed within the housing, a first winding frame disposed within the first fixed iron core, and a first coil assembly disposed within the first winding frame; a first movable iron core is fixedly disposed on the inner shaft branch; a first magnet assembly is disposed on the first movable iron core; the first magnet assembly is disposed within the first coil assembly; and the first fixed iron core is disposed on top of the second fixed iron core.

[0016] The telescopic assembly includes a second fixed iron core disposed within the housing, a second winding frame disposed within the second fixed iron core, and a second coil assembly disposed within the second winding frame; a second moving iron core and a third moving iron core are fixedly disposed on the inner shaft branch; the second moving iron core is provided with a second magnet assembly; the third moving iron core is provided with a third magnet assembly; the second magnet assembly is disposed within the top of the second coil assembly; the third magnet assembly is disposed within the bottom of the second coil assembly.

[0017] The present invention is further configured such that the first magnet group includes four first magnets; the four first magnets are arranged circumferentially on the outer wall of the first moving iron core; the first coil group includes a first long coil and a second long coil symmetrically arranged on the first winding frame.

[0018] The second magnet group includes four second magnets; the four second magnets are arranged at equal angles along the circumference on the outer wall of the second moving iron core; the third magnet group includes four third magnets; the four third magnets are arranged at equal angles along the circumference on the outer wall of the third moving iron core; the second coil group includes a first short coil, a second short coil, a third short coil, and a fourth short coil arranged at equal angles along the circumference on the second winding frame.

[0019] The beneficial effects of this utility model are as follows: By setting a spring assembly at the bottom of the housing, when the inner shaft rotates left and right, the relative rotation between the inner shaft and the spring is achieved due to the setting of the rotating bearing. That is, the rotation of the inner shaft will not cause the spring to move. When the inner shaft extends and retracts up and down, the inner shaft drives the annular fixed part to move up and down through the rotating bearing, thereby causing the annular deformation part to produce elastic deformation, which can increase the vibration frequency of the inner shaft. In addition, by reducing one sliding bearing, the production process can be optimized, the cost can be reduced, and the vibration frequency can be increased. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0022] Figure 3 This is a cross-sectional view of the present invention;

[0023] Figure 4 This is an exploded view of the spring clip assembly of this utility model;

[0024] The components include: 1. Housing; 11. Upper cover; 2. Inner shaft branch; 21. First moving iron core; 22. First magnet assembly; 23. Second moving iron core; 24. Second magnet assembly; 25. Third moving iron core; 26. Third magnet assembly; 3. Vibration sweeping assembly; 31. First fixed iron core; 32. First winding frame; 4. Telescopic assembly; 41. Second fixed iron core; 42. Second winding frame; 51. Outer steel sleeve; 52. Inner steel sleeve; 53. Inner sliding sleeve; 61. Upper baffle plate; 62. Upper through hole; 63. Upper oil baffle sleeve; 7. Spring clip frame; 81. Annular positioning part; 82. Annular deformation part; 83. Annular fixing part; 84. First connecting rib; 85. Second connecting rib; 9. Rotary bearing. Detailed Implementation

[0025] The present invention will be further described in conjunction with the following embodiments.

[0026] Depend on Figures 1 to 4As can be seen, the high vibration frequency dual-degree-of-freedom sweeping motor described in this embodiment includes a housing 1 and an inner shaft branch 2; the top of the housing 1 is provided with an upper end cover 11; the bottom of the housing 1 is provided with a spring sheet assembly; the housing 1 is provided with a sweeping assembly 3 and a telescopic assembly 4 along the length direction inside the housing 1.

[0027] A sliding bearing is provided between the top of the inner shaft branch 2 and the upper end cover 11;

[0028] The spring assembly includes a spring frame 7 and spring components; the spring components include an annular positioning part 81, an annular deformation part 82, and an annular fixing part 83 arranged concentrically; the spring frame 7 is fixedly disposed at the bottom of the housing 1; the annular positioning part 81 is fixedly disposed at the spring frame 7; the annular deformation part 82 is disposed within the annular positioning part 81; the annular fixing part 83 is disposed within the annular deformation part 82; a first connecting rib 84 is provided between the annular deformation part 82 and the annular positioning part 81; a second connecting rib 85 is provided between the annular deformation part 82 and the annular fixing part 83; a rotating bearing 9 is fixedly disposed within the annular fixing part 83; the bottom of the inner shaft branch 2 is fixedly disposed within the rotating bearing 9.

[0029] Specifically, the high-frequency dual-degree-of-freedom sweeping motor described in this embodiment achieves sweeping function by setting a sweeping component 3 inside the housing 1, allowing the inner shaft branch 2 to rotate left and right; secondly, by setting a telescopic component 4 inside the housing 1, allowing the inner shaft branch 2 to extend and retract up and down; furthermore, by setting a sliding bearing, the shaft branch can better achieve both left and right sweeping and up and down extension and retraction, enabling the motor to complete two-degree-of-freedom operation, extending the motor's lifespan, and enhancing its applicability; additionally, by setting a spring piece assembly at the bottom of the housing 1, when the inner shaft branch 2 rotates left and right, the rotation bearing 9 allows relative rotation between the inner shaft branch 2 and the spring piece, meaning the rotation of the inner shaft branch 2 does not cause movement of the spring piece. When the inner shaft branch 2 extends and retracts up and down, the inner shaft branch 2 drives the annular fixed part 83 to move up and down through the rotation bearing 9, causing the annular deformation part 82 to undergo elastic deformation, thereby increasing the vibration frequency of the inner shaft branch 2.

[0030] This embodiment describes a high-frequency, dual-degree-of-freedom sweeping motor. The sliding bearing includes an outer steel sleeve 51, an inner steel sleeve 52, and an inner sliding sleeve 53. The outer steel sleeve 51 is fixedly disposed within the upper end cover 11. The inner steel sleeve 52 is movably disposed within the outer steel sleeve 51. The inner sliding sleeve 53 is disposed between the inner steel sleeve 52 and the outer steel sleeve 51. The inner shaft branch 2 is fixedly sleeved within the inner steel sleeve 52. This configuration enables the inner shaft branch 2 to stably perform sweeping and telescopic functions.

[0031] This embodiment describes a high-frequency, dual-degree-of-freedom sweeping vibrating motor. The top of the upper end cover 11 is provided with an upper baffle plate 61; the upper baffle plate 61 has a through-hole 62; the inner steel sleeve 52 passes through the through-hole 62; the inner shaft branch 2 has an upper oil-blocking sleeve 63 inside the housing 1; and the inner sliding sleeve 53 is located between the upper baffle plate 61 and the upper oil-blocking sleeve 63. In this embodiment, the cooperation between the upper oil-blocking sleeve 63 and the upper baffle plate 61 reduces the loss of lubricating oil between the inner steel sleeve 52 and the outer steel sleeve 51, thereby improving the overall wear resistance.

[0032] This embodiment describes a high-frequency, dual-degree-of-freedom sweeping motor. The number of first connecting ribs 84 is two; the two first connecting ribs 84 are symmetrically arranged around the center of the annular deformation portion 82. The number of second connecting ribs 85 is also two; the two second connecting ribs 85 are symmetrically arranged around the center of the annular deformation portion 82. This arrangement enhances the stability of the spring component.

[0033] In this embodiment, a high-frequency, dual-degree-of-freedom sweeping vibration motor is described, in which the diameters of the two first connecting ribs 84 are perpendicular to the diameters of the two second connecting ribs 85. This arrangement enables the annular deformation section 82 to stably undergo elastic deformation.

[0034] The high-frequency, dual-degree-of-freedom sweeping vibration motor described in this embodiment features an annular positioning part 81, annular deformation part 82, annular fixing part 83, first connecting rib 84, and second connecting rib 85 integrally injection molded. This design facilitates the production and manufacturing of the spring-loaded components.

[0035] In this embodiment, a high-frequency dual-degree-of-freedom sweeping vibrating motor is described, wherein the rotating bearing 9 is a ball bearing. In this embodiment, the spring holder 7 is made of POM plastic, and the spring element is made of PEEK plastic.

[0036] This embodiment describes a high-frequency, dual-degree-of-freedom sweeping motor. The sweeping assembly 3 includes a first fixed iron core 31 disposed within a housing 1, a first winding frame 32 disposed within the first fixed iron core 31, and a first coil assembly disposed within the first winding frame 32. A first moving iron core 21 is fixedly disposed on the inner shaft branch 2. The first moving iron core 21 is provided with a first magnet assembly 22. The first magnet assembly 22 is disposed within the first coil assembly. The first fixed iron core 31 is disposed on top of a second fixed iron core 41.

[0037] The telescopic assembly 4 includes a second fixed iron core 41 disposed within the housing 1, a second winding frame 42 disposed within the second fixed iron core 41, and a second coil assembly disposed within the second winding frame 42; the inner shaft branch 2 is fixedly provided with a second moving iron core 23 and a third moving iron core 25; the second moving iron core 23 is provided with a second magnet assembly 24; the third moving iron core 25 is provided with a third magnet assembly 26; the second magnet assembly 24 is disposed within the top of the second coil assembly; the third magnet assembly 26 is disposed within the bottom of the second coil assembly.

[0038] Specifically, this embodiment, through the above-described configuration, allows currents in different directions to be passed through the first coil group, enabling the first moving iron core 21 to drive the inner shaft branch 2 to rotate forward or backward, thereby achieving left-right sweeping vibration. Furthermore, by passing currents in different directions through the second coil group, the second moving iron core 23 and the third moving iron core 25 can drive the inner shaft branch 2 to move up and down, thereby achieving a telescopic function.

[0039] Furthermore, the inner shaft branch 2 is a D-type flat shaft. This configuration enhances the radial torque of the inner shaft branch 2 and improves its reliability.

[0040] This embodiment describes a high-frequency, dual-degree-of-freedom sweeping motor. The first magnet assembly 22 includes four first magnets, which are circumferentially disposed on the outer wall of the first moving iron core 21. The first coil assembly includes a first long coil and a second long coil symmetrically disposed on the first winding frame 32. In this embodiment, the tail ends of the first and second long coils are connected. The first and second long coils are not shown in the figures. Specifically, through this arrangement, the first and second long coils are connected together, allowing the inner shaft branch 2 to achieve left and right sweeping vibration in a single-phase manner. Furthermore, the sweeping frequency is adjustable between 3-10 Hz, and the sweeping angle is adjustable between 10-60 degrees.

[0041] The second magnet group 24 includes four second magnets; the four second magnets are circumferentially disposed at equal angles on the outer wall of the second moving iron core 23; the third magnet group 26 includes four third magnets; the four third magnets are circumferentially disposed at equal angles on the outer wall of the third moving iron core 25; the second coil group includes a first short coil, a second short coil, a third short coil, and a fourth short coil circumferentially disposed at equal angles on the second winding frame 42. The first short coil, second short coil, third short coil, and fourth short coil are not shown in the figure.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A high-frequency, two-degree-of-freedom sweeping motor, characterized in that: It includes a housing (1) and an inner shaft (2); the top of the housing (1) is provided with an upper end cover (11); the bottom of the housing (1) is provided with a spring sheet assembly; the housing (1) is provided with a sweeping vibration assembly (3) and a telescopic assembly (4) along the length direction inside; A sliding bearing is provided between the top of the inner shaft branch (2) and the upper end cover (11); The spring assembly includes a spring frame (7) and a spring piece; the spring piece includes an annular positioning part (81), an annular deformation part (82), and an annular fixing part (83) arranged concentrically; the spring frame (7) is fixedly disposed at the bottom of the housing (1); the annular positioning part (81) is fixedly disposed at the spring frame (7); the annular deformation part (82) is disposed inside the annular positioning part (81); the annular fixing part (83) is disposed inside the annular deformation part (82); a first connecting rib (84) is provided between the annular deformation part (82) and the annular positioning part (81); a second connecting rib (85) is provided between the annular deformation part (82) and the annular fixing part (83); a rotating bearing (9) is fixedly disposed inside the annular fixing part (83); the bottom of the inner shaft branch (2) is fixedly disposed inside the rotating bearing (9).

2. The high-frequency, dual-degree-of-freedom sweeping motor according to claim 1, characterized in that: The sliding bearing includes an outer steel sleeve (51), an inner steel sleeve (52), and an inner sliding sleeve (53); the outer steel sleeve (51) is fixedly installed inside the upper end cover (11); the inner steel sleeve (52) is movably installed inside the outer steel sleeve (51); the inner sliding sleeve (53) is located between the inner steel sleeve (52) and the outer steel sleeve (51); and the inner shaft branch (2) is fixedly sleeved inside the inner steel sleeve (52).

3. The high-frequency, dual-degree-of-freedom sweeping motor according to claim 2, characterized in that: The top of the upper end cover (11) is provided with an upper baffle plate (61); the upper baffle plate (61) is provided with an upper through hole (62); the inner steel sleeve (52) is provided through the upper through hole (62); the inner shaft branch (2) is provided with an upper oil baffle sleeve (63) inside the housing (1); the inner sliding sleeve (53) is provided between the upper baffle plate (61) and the upper oil baffle sleeve (63).

4. The high-frequency, two-degree-of-freedom sweeping vibration motor according to claim 1, characterized in that: The number of the first connecting ribs (84) is two; the two first connecting ribs (84) are symmetrically arranged around the center of the annular deformation part (82); the number of the second connecting ribs (85) is two; the two second connecting ribs (85) are symmetrically arranged around the center of the annular deformation part (82).

5. A high-frequency, two-degree-of-freedom sweeping motor according to claim 4, characterized in that: The diameter of the two first connecting bars (84) is perpendicular to the diameter of the two second connecting bars (85).

6. A high-frequency, dual-degree-of-freedom sweeping motor according to claim 1, characterized in that: The annular positioning part (81), the annular deformation part (82), the annular fixing part (83), the first connecting rib (84), and the second connecting rib (85) are integrally injection molded.

7. A high-frequency, two-degree-of-freedom sweeping motor according to claim 1, characterized in that: The rotating bearing (9) is a ball bearing.

8. A high-frequency, two-degree-of-freedom sweeping motor according to claim 1, characterized in that: The spring holder (7) is made of POM plastic; the spring piece is made of PEEK plastic.

9. A high-frequency, two-degree-of-freedom sweeping motor according to claim 1, characterized in that: The sweeping vibration assembly (3) includes a first fixed iron core (31) disposed inside the housing (1), a first winding frame (32) disposed on the first fixed iron core (31), and a first coil assembly disposed on the first winding frame (32); the inner shaft branch (2) is fixedly provided with a first moving iron core (21); the first moving iron core (21) is provided with a first magnet assembly (22); the first magnet assembly (22) is disposed inside the first coil assembly; the first fixed iron core (31) is disposed on top of the second fixed iron core (41); The telescopic assembly (4) includes a second fixed iron core (41) disposed in the housing (1), a second winding frame (42) disposed in the second fixed iron core (41), and a second coil assembly disposed in the second winding frame (42); the inner shaft branch (2) is fixedly provided with a second moving iron core (23) and a third moving iron core (25); the second moving iron core (23) is provided with a second magnet assembly (24); the third moving iron core (25) is provided with a third magnet assembly (26); the second magnet assembly (24) is disposed in the top of the second coil assembly; the third magnet assembly (26) is disposed in the bottom of the second coil assembly.

10. A high-frequency, two-degree-of-freedom sweeping motor according to claim 9, characterized in that: The first magnet group (22) includes four first magnets; the four first magnets are arranged circumferentially on the outer wall of the first moving iron core (21); the first coil group includes a first long coil and a second long coil symmetrically arranged on the first winding frame (32); The second magnet group (24) includes four second magnets; the four second magnets are arranged at equal angles along the circumference on the outer wall of the second moving iron core (23); the third magnet group (26) includes four third magnets; the four third magnets are arranged at equal angles along the circumference on the outer wall of the third moving iron core (25); the second coil group includes a first short coil, a second short coil, a third short coil and a fourth short coil arranged at equal angles along the circumference on the second winding frame (42).

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