High-frequency vibration device

Abstract

A high-frequency vibration device comprises an output shaft, a stator assembly and a mover assembly, the mover assembly is connected with the output shaft, and the stator assembly and the mover assembly interact to drive the output shaft to rotate in a high-frequency reciprocating mode. The limiting piece can rotate along with the output shaft, and the limiting piece is matched with a fixedly-arranged limiting groove to be restrained to rotate within a first angle range. The limiting piece is arranged on the output shaft, the rotation angle of the output shaft is restrained through matching of the limiting piece and the limiting groove, and therefore more reliable rotation restraining is achieved. In addition, a spring is sleeved on the output shaft, so that the axial clearance can be reduced, and the noise can be reduced. The high-frequency vibration device has the advantages of being simple in structure, practical in function, high in practicability and suitable for being popularized vigorously.

Description

Technical Field

[0001] The utility model relates to a high-frequency vibration device, in particular to a high-frequency vibration device capable of limiting the rotation amplitude. Background Art

[0002] As is well known, in a traditional vibration motor, a set of adjustable eccentric blocks are installed at both ends of the iron core rotor shaft, and exciting force is obtained by the centrifugal force generated by the high-speed rotation of the shaft and the eccentric blocks. The vibration frequency range of the vibration motor is large, and only when the exciting power and the power are properly matched can the mechanical noise be reduced. Due to its eccentric structure, its amplitude is uneven, the vibration frequency is not stable enough, and it is not easy to be miniaturized. Therefore, in order to meet different usage requirements, a vibration device that makes the rotor rotate slightly at a high frequency by generating a magnetic field through an alternating current has been developed, such as the patented technical solution - a motor applied by the applicant before, with an application number of 2015100566771. For a motor with this structure, it can generate high-frequency small-amplitude vibration, and its vibration frequency is high, and its application range is very wide. To restrict the rotation amplitude of the central shaft to facilitate the central shaft to return to the correct position, an elastic structure is usually provided between the end of the central shaft and the housing, such as a metal shrapnel structure or an S-shaped spring structure. The elastic structure is arranged axially, one end is connected to the output shaft, and one end is connected to the housing, and it provides an action for the central shaft to return to the correct position through elastic torsion. It is found in practice that by using the elastic structure to provide a rotation amplitude constraint for the central shaft, the elastic structure is likely to fail, so the provided constraint is not very effective. In addition, for such a small high-frequency vibration motor, the noise during operation still needs to be further reduced. Summary of the Utility Model

[0003] The utility model aims to solve the above problems and provides a high-frequency vibration device that can provide effective limit constraints and reduce noise.

[0004] To solve the above problems, the utility model provides a high-frequency vibration device, which includes an output shaft, a stator assembly, and a rotor assembly. The rotor assembly is connected to the output shaft, and the stator assembly and the rotor assembly interact with each other to drive the output shaft to rotate back and forth at a high frequency. The characteristic is that a limiting member is sleeved on the output shaft. The limiting member can rotate with the output shaft, and the limiting member is constrained to rotate within a first angular range in cooperation with a fixedly arranged limiting groove.

[0005] Further, the limiting member includes a sleeved portion and a limiting convex portion. The sleeved portion is sleeved on the output shaft and can rotate synchronously with the output shaft. The limiting convex portion protrudes from the sleeved portion and at least partially extends into the limiting groove; the limiting convex portion can move in the limiting groove.

[0006] Further, a first stop portion is provided on the outer wall of the output shaft, and a second stop portion is provided on the inner wall of the sleeved portion. The first stop portion and the second stop portion cooperate to prevent relative circumferential rotation between the output shaft and the limiting member.

[0007] Further, the first stop portion is planar and recessed with respect to the circumferential outer wall of the output shaft; the second stop portion is planar and is arranged in contact with the first stop portion.

[0008] Further, the high-frequency vibration device includes a housing, and the output shaft is rotatably connected to the housing; one end of the housing is provided with a central groove, and a limiting groove is provided on the periphery of the central groove. The limiting groove communicates with the central groove, and the sleeved portion is received in the central groove and can move in the central groove;

[0009] The limiting convex portion extends from the central groove into the limiting groove, or directly extends into the limiting groove.

[0010] Further, the central groove is a circular groove, and the limiting groove is a fan-shaped groove.

[0011] Further, a bearing is provided between the housing and the output shaft, and a spring is sleeved on the output shaft. One end of the spring abuts against the bearing, and the other end of the spring abuts against the end of the mover assembly.

[0012] Further, the housing includes a shell cylinder and an end cover which are joined together. The bearing includes a first bearing and a second bearing. The first bearing is arranged in the shell cylinder, and the second bearing is arranged in the end cover; the first end of the output shaft passes through the first bearing and extends out of the shell cylinder; the second end of the output shaft is connected to the second bearing.

[0013] Further, one end of the spring abuts against the first bearing, and the other end abuts against the end of the mover assembly.

[0014] Further, a bearing groove, the central groove and the limiting groove are provided on the end cover. The bearing groove communicates with the central groove at least axially; the second bearing is arranged in the bearing groove; the limiting member is located between the mover assembly and the second bearing.

[0015] The beneficial contribution of the present utility model is that it effectively solves the above problems. The present utility model is provided with a limiting member on the output shaft, and the rotation angle of the output shaft is restricted through the cooperation of the limiting member and the limiting groove, so as to achieve more reliable rotation restriction. In addition, the present utility model is also sleeved with a spring on the output shaft, which can reduce the axial clearance and reduce the noise. The high-frequency vibration device of the present utility model has the characteristics of simple structure and practical function, and has strong practicability and is suitable for being vigorously promoted. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the overall structure of the present utility model.

[0017] Figure 2 is a schematic exploded view of the structure of the present utility model.

[0018] Figure 3 is a schematic exploded view of the structure of the present utility model.

[0019] Figure 4 is a longitudinal sectional view of the present utility model.

[0020] Figure 5 is a transverse sectional view of the present utility model.

[0021] Figure 6 is a transverse sectional view of the present utility model.

[0022] Reference Numerals in the Drawings: output shaft 10, first stop portion 11, first end 12, second end 13, stator assembly 20, stator core 21, main body portion 211, magnetic shoe portion 212, insulating frame 22, rotor assembly 30, rotor core 31, magnet 32, housing 40, housing cylinder 41, end cover 42, central groove 421, limiting groove 422, bearing groove 423, limiting member 50, sleeved portion 51, second stop portion 511, limiting convex portion 52, spring 60, first bearing 71, second bearing 72, coil 80. Detailed Description of the Preferred Embodiments

[0023] The following embodiments are further explanations and supplements to the present utility model and do not constitute any limitation to the present utility model.

[0024] As Figures 1 to 6 shown, the high-frequency vibration device of the present utility model includes an output shaft 10, a stator assembly 20, and a rotor assembly 30. The main point of the present utility model is that a limiting member 50 is provided on the output shaft 10, and the rotation angle of the output shaft 10 is restricted by the limiting member 50, so as to achieve more reliable rotation restriction. In addition, a spring 60 is sleeved on the output shaft 10 of the present utility model, which can reduce the axial clearance and reduce the noise.

[0025] Specifically, the rotor assembly 30 is connected to the output shaft 10, and the two are coaxially fixed and can rotate together. When the rotor assembly 30 and the output shaft 10 rotate, they rotate around the central axis of the output shaft 10. When an electric current is applied to the coil 80, the stator assembly 20 and the rotor assembly 30 interact with each other to drive the output shaft 10 and the rotor assembly 30 to rotate back and forth at a high frequency.

[0026] By controlling the current on the coil 80, the rotation direction of the output shaft 10 can be controlled for commutation. To better restrict the amplitude of the reciprocating rotation of the output shaft 10, a limiting member 50 is sleeved on the output shaft 10. The limiting member 50 can rotate synchronously with the output shaft 10. The limiting member 50 cooperates with the fixedly arranged limiting groove 422, so that the limiting member 50 is restricted to rotate within a first angular range, and further the output shaft 10 is also restricted to rotate within the first angular range.

[0027] The range of the first angle can be set as needed, and the present invention does not limit it.

[0028] The fixedly arranged limiting groove 422 means that the limiting groove 422 does not move with the mover assembly 30 and the output shaft 10.

[0029] Further, the limiting member 50 includes a sleeving portion 51 and a limiting convex portion 52. The sleeving portion 51 and the limiting convex portion 52 are integrally formed or fixedly connected. In this embodiment, the sleeving portion 51 and the limiting convex portion 52 are integrally formed.

[0030] The sleeving portion 51 is sleeved on the output shaft 10 and can rotate synchronously with the output shaft 10. The limiting convex portion 52 protrudes radially from the sleeving portion 51 and at least partially extends into the limiting groove 422. Of course, the limiting convex portion 52 can also protrude axially from the sleeving portion 51 and at least partially extend into the limiting groove 422. The limiting convex portion 52 is located in the limiting groove 422 and can move in the limiting groove 422. Therefore, the rotation range of the limiting member 50 can be restricted by the limiting groove 422, so that the limiting member 50 can only rotate within the range of the limiting groove 422.

[0031] In this embodiment, the limiting groove 422 is a fan-shaped groove, the size of which is related to the first angle range and can be set as needed. The number of the limiting groove 422 and the limiting convex portion 52 can be one or multiple, and can be specifically set as needed.

[0032] To enable the limiting member 50 to rotate synchronously with the output shaft 10, a first stopping portion 11 is provided on the outer wall of the output shaft 10, and a second stopping portion 511 is provided on the inner wall of the sleeving portion 51. The first stopping portion 11 and the second stopping portion 511 cooperate to prevent the output shaft 10 and the limiting member 50 from rotating relative to each other circumferentially, and further enable the limiting member 50 and the output shaft 10 to rotate synchronously.

[0033] In this embodiment, the first stop portion 11 is planar and recessed with respect to the circumferential outer wall of the output shaft 10, so that the cross-section of the output shaft 10 here is similar to a D shape. The second stop portion 511 is planar and is arranged in contact with the first stop portion 11. In this way, the limiting member 50 can be prevented from rotating circumferentially with respect to the output shaft 10. In addition, the cooperation of the first stop portion 11 and the second stop portion 511 can also prevent the limiting member 50 from moving axially with respect to the output shaft 10.

[0034] To facilitate the setting of the limiting groove 422, the high-frequency vibration device includes a housing 40.

[0035] The output shaft 10 is rotatably connected to the housing 40.

[0036] At one end of the housing 40, a central groove 421 is provided, and the limiting groove 422 is provided around the central groove 421. The limiting groove 422 communicates with the central groove 421. The sleeved portion 51 is received in the central groove 421 and can move in the central groove 421. The limiting convex portion 52 extends from the central groove 421 into the limiting groove 422 and can move in the limiting groove 422. Or, the limiting convex portion 52 directly extends into the limiting groove 422 and can move in the limiting groove 422.

[0037] In this embodiment, the central groove 421 is a circular groove, and its diameter is larger than the diameter of the sleeved portion 51.

[0038] The housing 40 includes a shell cylinder 41 and an end cover 42 which are joined together. After the housing 40 and the end cover 42 are joined together, an accommodation cavity is formed inside, which can be used to install the stator assembly 20, the rotor assembly 30 and the output shaft 10.

[0039] To facilitate the rotation of the output shaft 10, a bearing is provided between the housing 40 and the output shaft 10. The bearing includes a first bearing 71 and a second bearing 72. The first bearing 71 is arranged in the shell cylinder 41, and the second bearing 72 is arranged in the end cover 42.

[0040] The first end 12 of the output shaft 10 passes through the first bearing 71 and extends out of the shell cylinder 41. The second section of the output shaft 10 is connected to the second bearing 72. In this way, through the support of the first bearing 71 and the second bearing 72, the output shaft 10 can rotate in the housing 40.

[0041] The first bearing 71 and the second bearing 72 can be selected from known bearings, such as rolling bearings.

[0042] The limiting member 50 is sleeved on the second end 13 of the output shaft 10. Specifically, a bearing groove 423, a central groove 421 and a limiting groove 422 are provided on the end cover 42.

[0043] Among them, the bearing groove 423 is used to install the second bearing 72. The bearing groove 423 is at least axially communicated with the central groove 421. The bearing groove 423 is closer to the end of the second end 13 of the output shaft 10, and the central groove 421 is farther from the end of the second end 13 of the output shaft 10.

[0044] The limiting member 50 is sleeved on the second end 13 of the output shaft 10 and is located between the rotor assembly 30 and the second bearing 72.

[0045] When the output shaft 10 reciprocally rotates, in order to eliminate the clearance to reduce the noise, a spring 60 is sleeved on the output shaft 10. One end of the spring 60 abuts against the bearing, and one end abuts against the rotor assembly 30. The spring 60 always has a tendency to drive the output shaft 10 to be in the default position. In this way, if the output shaft 10 has a tendency to axially move, under the action of the spring 60, the output shaft 10 will not axially move, thereby avoiding the axial floating of the output shaft 10 and resulting in noise.

[0046] In this embodiment, the spring 60 is located between the first bearing 71 and the rotor assembly 30, with one end abutting against the first bearing 71 and one end abutting against the end of the rotor assembly 30.

[0047] The rotor assembly 30 includes a rotor core 31 and a plurality of magnets 32.

[0048] The rotor core 31 is fixedly sleeved on the output shaft 10 and can rotate synchronously with the output shaft 10. A plurality of magnet grooves are provided on the outer wall of the rotor core 31 along the axial direction, and the magnets 32 are respectively fixedly arranged in the magnet grooves. In this embodiment, the rotor core 31 is provided with 4 strip-shaped magnet grooves, and 4 long strip-shaped magnets 32 are fixedly embedded in the magnet grooves. The magnets 32 are symmetrically distributed.

[0049] The stator assembly 20 includes a stator core 21 and an insulating frame 22.

[0050] The stator core 21 surrounds the periphery of the rotor assembly 30, and it includes a main body portion 211 in a runway shape and magnetic shoe portions 212 protruding from the inner wall of the main body portion 211. The magnetic shoe portions 212 are spaced opposite to each other, facing the rotor core 31, and the magnetic shoe portions 212 are of a symmetrical structure, and their symmetry centers coincide with the symmetry center of the rotor assembly 30.

[0051] The coil 80 is sleeved on the magnetic shoe portion 212 of the stator core 21, and is constrained between the end portion and the main body portion 211 of the magnetic shoe portion 212, so that it is not easy to loosen.

[0052] The insulating sleeve is sleeved on both ends of the stator core 21, and is used to isolate the coil 80 and the stator core 21.

[0053] When the coil 80 is energized with a working power supply, virtual magnetic poles are generated on the magnetic shoe portion 212; when the current of the coil 80 changes, the polarities of the virtual magnetic poles on the magnetic shoe portion 212 alternate, and thus interact with the magnet 32. Under the action of like poles repelling and unlike poles attracting, the mover assembly 30 drives the output shaft 10 to rotate reciprocally.

[0054] Since a limiting member 50 is sleeved on the output shaft 10 and the limiting member 50 is constrained to rotate within the range of the limiting groove 422, the amplitude of the reciprocal rotation of the output shaft 10 can be constrained by the limiting member 50. In addition, since a spring 60 is provided on the output shaft 10, the noise generated when the output shaft 10 rotates reciprocally can be greatly reduced.

[0055] The limiting member 50 is preferably of a rigid structure and is made of a hard material such as plastic. Of course, it can also be made of a slightly elastic material such as rubber. The limiting member 50 provides a limiting constraint for the output shaft 10, mainly by cooperating with the limiting groove 422. When the limiting member 50 is made of a slightly elastic material, elastic deformation may occur when the limiting member 50 collides with both ends of the limiting groove 422, but the constraint provided by this elastic deformation is very small compared to the constraint range provided by the limiting groove 422. Therefore, regardless of the material of the limiting member 50, it mainly provides a range constraint for the rotation amplitude of the output shaft 10 by cooperating with the limiting groove 422.

[0056] Although the present invention has been disclosed through the above embodiments, the scope of the present invention is not limited thereto. Without departing from the concept of the present invention, the above components can be replaced with similar or equivalent elements known to those skilled in the art.

Claims

1. A high-frequency vibration device, comprising an output shaft (10), a stator assembly (20), and a mover assembly (30), wherein the mover assembly (30) is connected to the output shaft (10), and the stator assembly (20) and the mover assembly (30) interact with each other to drive the output shaft (10) to reciprocate at a high frequency, characterized in that: A limiting member (50) is sleeved on the output shaft (10), the limiting member (50) can rotate along with the output shaft (10), and the limiting member (50) cooperates with a fixed limiting groove (422) to be constrained to rotate within a first angle range.

2. The high frequency vibration device according to claim 1, characterized in that: The limiting member (50) comprises a sleeve portion (51) and a limiting convex portion (52); the sleeve portion (51) is sleeved on the output shaft (10) and can rotate synchronously with the output shaft (10); the limiting convex portion (52) protrudes from the sleeve portion (51) and at least partially extends into the limiting groove (422); the limiting convex portion (52) can move in the limiting groove (422).

3. The high frequency vibration device according to claim 2, characterized in that: A first stop portion (11) is provided on the outer wall of the output shaft (10), and a second stop portion (511) is provided on the inner wall of the sleeve portion (51); the first stop portion (11) cooperates with the second stop portion (511) to prevent the output shaft (10) and the limiting member (50) from rotating relative to each other in the circumferential direction.

4. The high frequency vibration device according to claim 3, characterized in that: The first stop portion (11) is planar and recessed relative to the circumferential outer wall of the output shaft (10); the second stop portion (511) is planar and is disposed in close contact with the first stop portion (11).

5. The high frequency vibration device according to claim 2, characterized in that: The high-frequency vibration device comprises a housing (40), wherein the output shaft (10) is rotatably connected to the housing (40); a central groove (421) is provided at one end of the housing (40), and a limiting groove (422) is provided on the periphery of the central groove (421), wherein the limiting groove (422) is connected to the central groove (421). The sleeve portion (51) is accommodated in the central groove (421) and can move in the central groove (421); The limiting protrusion (52) extends from the central groove (421) into the limiting groove (422), or directly extends into the limiting groove (422).

6. The high frequency vibration device according to claim 5, characterized in that: The central groove (421) is a circular groove, and the limiting groove (422) is a fan-shaped groove.

7. The high frequency vibration device according to claim 5, characterized in that: A bearing is provided between the housing (40) and the output shaft (10), and a spring (60) is sleeved on the output shaft (10), one end of the spring (60) abuts against the bearing, and the other end of the spring (60) abuts against an end of the mover assembly (30).

8. The high frequency vibration device according to claim 7, characterized in that: The housing (40) comprises a shell cylinder (41) and an end cover (42) that are coupled and connected, and the bearing comprises a first bearing (71) and a second bearing (72). The first bearing (71) is disposed in the shell (41), and the second bearing (72) is disposed in the end cover (42); The first end (12) of the output shaft (10) passes through the first bearing (71) and extends out of the shell (41); The second end (13) of the output shaft (10) is connected to the second bearing (72).

9. The high frequency vibration device according to claim 8, characterized in that: One end of the spring (60) abuts against the first bearing (71), and the other end abuts against the end of the mover assembly (30).

10. The high frequency vibration device according to claim 8, characterized in that: A bearing groove (423), the center groove (421) and a limit groove (422) are provided on the end cover (42), and the bearing groove (423) at least penetrates the center groove (421) along the axial direction; The second bearing (72) is arranged in the bearing groove (423); The limiting member (50) is located between the movable subassembly (30) and the second bearing (72).

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