Linear vibration motor

Abstract

The application relates to the motor technical field and provides a linear vibration motor which comprises a shell, a stator assembly, a vibrator assembly and an elastic assembly. The elastic assembly comprises an elastic piece which comprises a first fixed part, a second fixed part and an elastic connecting part. The second fixed part has a first annular surface, and the center normal direction of the plane of the first annular surface is parallel to a first direction. The elastic connecting part is an annular structure extending from the outer circumferential surface of the first fixed part to the inner circumferential surface of the second fixed part. The projection of the first fixed part along the first direction is completely located in the area formed by the second fixed part. The vibrator assembly drives the first fixed part to move, so that the elastic connecting part is deformed around the center to provide a restoring force. The application adopts the elastic piece made of non-metal material, and the annular elastic connecting part is arranged on the elastic piece, thereby reducing the vibration tensile stress and the fracture risk, and the application is suitable for a large-mass vibrator motor and a motor structure with a width less than 6.0 mm.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more particularly to a linear vibration motor. Background Technology

[0002] Linear vibration motors are widely used in mobile terminals, wearable devices, and other fields, typically employing elastic structures to support and reset the oscillator. Existing linear vibration motors mostly use metal springs or integrally molded non-metallic elastic materials as the elastic support structure, but this approach still has shortcomings in practical applications. First, these springs usually require a high elastic modulus, making them more suitable for motor structures with a width greater than 6.0 mm. When the motor width is less than 6.0 mm, the shortened lever arm leads to a significant increase in local stress, making them prone to fatigue damage or even fracture during long-term high-frequency vibration, resulting in poor reliability. Second, existing spring structures are more suitable for motors with smaller oscillator masses. For motors with larger oscillator masses, their load-bearing capacity and structural form are limited, making it difficult to simultaneously meet the requirements of elastic stroke and structural strength within a limited space, easily leading to vibration instability or performance degradation. Furthermore, existing spring structures are usually complex in shape, requiring high molding precision and mold structure, resulting in high manufacturing and assembly costs, which is detrimental to the miniaturization and mass production of motors.

[0003] Therefore, it is necessary to provide a simple, reliable, and elastic support structure for linear vibration motors that is suitable for small-sized and large-mass oscillators, in order to meet the demands of electronic products for high performance, miniaturization, and low cost. Summary of the Invention

[0004] The purpose of this invention is to provide a new linear vibration motor. By improving the force distribution and structural form of the elastic element, it solves the problems of significantly increased stress and easy fatigue failure of the elastic component when the motor width is less than 6.0 mm. At the same time, it overcomes the defects of existing spring structures such as poor adaptability to the mass of the oscillator, complex structure, cumbersome assembly process and high manufacturing cost. Thus, the vibration motor can still have high reliability, stability and good vibration performance under small size conditions. To achieve the above objectives, the technical solution of the present invention is as follows: A linear vibration motor includes a housing, a stator assembly fixedly disposed within the housing, an oscillator assembly spaced apart from the stator assembly, and an elastic component suspending the oscillator assembly within the housing. The oscillator assembly reciprocates along a first direction. The elastic component includes an elastic element, which comprises a first fixing part fixedly connected to the oscillator assembly, an annular second fixing part fixedly connected to the housing, and an elastic connecting part connecting the first fixing part and the second fixing part. The first fixing part includes an outer peripheral surface extending along the first direction, and the second fixing part includes an inner peripheral surface extending along the first direction and a first annular surface near the oscillator assembly. The center normal direction of the plane containing the first annular surface is parallel to the first direction. The elastic connecting part is an annular structure extending from the outer peripheral surface of the first fixing part to the inner peripheral surface of the second fixing part. The projection of the first fixing part along the first direction is completely located within the area enclosed by the second fixing part. The vibration of the oscillator assembly drives the first fixing part to move along the first direction, thereby causing the center of the elastic connecting part to deform around its periphery to provide a restoring force.

[0005] Preferably, the second fixing part surrounds the first fixing part, and the central axis of the first fixing part along the second direction coincides with the central axis of the second fixing part along the second direction, and the second direction is perpendicular to the first direction.

[0006] Preferably, the thickness of the second fixing part in the first direction is greater than the thickness of the first fixing part in the first direction.

[0007] Preferably, the thickness of the elastic connection portion in the first direction gradually decreases from the second fixing portion to the first fixing portion.

[0008] Preferably, the elastic member has a recess on at least one of the side facing the oscillator assembly and the side facing away from the oscillator assembly.

[0009] Preferably, the elastic component includes an annular support frame, and the elastic element is fixed to the housing by the annular support frame.

[0010] Preferably, the annular support frame is provided with a plurality of spaced fixing holes, and the second fixing part extends outward to form a plurality of spaced fixing posts, the fixing posts being fitted into the corresponding fixing holes.

[0011] Preferably, the annular support frame has an opening, the axis of which is parallel to the first direction.

[0012] Preferably, the annular support frame and the elastic element are integrally formed.

[0013] Preferably, the thickness of the annular support frame along the first direction is greater than the thickness of the elastic element along the first direction.

[0014] Preferably, the elastic element is located on the side of the annular support frame closer to the oscillator assembly.

[0015] Preferably, the oscillator assembly includes a mass block, and a portion of the mass block protrudes and extends toward the elastic element from the side near the elastic element to form a snap-fit ​​portion, which is embedded and fixed to the first fixing portion.

[0016] Preferably, the mass block and the elastic element are integrally formed.

[0017] Preferably, the snap-fit ​​portion is provided with a through hole, and the first fixing portion is partially embedded and fixed in the through hole.

[0018] Preferably, the elastic element is a silicone elastic element or a rubber elastic element.

[0019] Preferably, the stator assembly includes a coil fixed to the housing, the winding axis of the coil being parallel to the first direction, and the coil being wound around the outside of the oscillator assembly.

[0020] Compared with related technologies, the advantages of this invention are as follows: By setting the elastic connecting part as a ring structure extending from the outer peripheral surface of the first fixing part to the inner peripheral surface of the second fixing part, the elastic connecting part can deform from the center to the periphery to provide restoring force when the oscillator assembly drives the first fixing part to move in the first direction. This structure uses the ring-shaped elastic connecting part as a lever arm, which can provide uniform support strength during vibration, has high structural stability, and is particularly suitable for motors with large-mass oscillators. At the same time, this structure, combined with silicone or rubber materials with low elastic modulus, low hardness, and high elongation, makes it suitable for micro motors with a width of less than 6.0 mm, effectively reducing the risk of breakage under short lever arm structures. In addition, the recessed design in the middle of the elastic element further reduces the stress generated by vibration tension, improving the reliability of the device. In terms of manufacturing process, this structure is simple, the mold cost is low, and it supports the integrated molding of the elastic element, the ring support frame, and the mass block, which significantly simplifies the assembly process and reduces production costs. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the linear vibration motor according to Embodiment 1 of the present invention;

[0022] Figure 2 For example Figure 1 The diagram shows a partial exploded view of a linear vibration motor.

[0023] Figure 3 For example Figure 1 An exploded view of the linear vibration motor shown.

[0024] Figure 4 For along Figure 1 Sectional view of line AA in the middle;

[0025] Figure 5 This is an exploded view of the elastic element in the linear vibration motor according to Embodiment 1 of the present invention;

[0026] Figure 6 This is a cross-sectional view of the linear vibration motor according to Embodiment 2 of the present invention. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figure 1-5As shown, Embodiment 1 of the present invention provides a linear vibration motor 100, including a housing 1, a stator assembly 2 fixedly disposed in the housing 1, an oscillator assembly 3 spaced apart from the stator assembly 2, and an elastic component 4 suspending the oscillator assembly 3 in the housing 1.

[0029] The stator assembly 2 includes two coils 21 fixed inside the housing 1. The winding axis of the coils 21 is parallel to the first direction, and the coils 21 are wound around the outside of the oscillator assembly 3. When the coils 21 are energized, the magnetic field generated by the current interacts with the magnetic field of the magnet 31, driving the oscillator assembly 3 to reciprocate along the first direction, which is the X-axis direction.

[0030] The oscillator assembly 3 includes three magnets 31 arranged along a first direction, four pole cores 32 alternately arranged with the magnets 31 along the first direction, clamping plates 33 disposed on the upper and lower surfaces of the magnets 31 and pole cores 32, and two mass blocks 34 symmetrically distributed on both sides of the magnets 31.

[0031] Specifically, each magnet 31 has a pole core 32 attached to each of its two sides arranged opposite to each other along the first direction. The pole cores 32 and the magnets 31 are arranged alternately in the first direction to form a magnetic circuit. Each magnet 31 is magnetized along the first direction and the magnetization directions of two adjacent magnets 31 are opposite. The magnetic poles of adjacent magnets 31 are arranged opposite to each other to generate a strong magnetic field, thereby increasing the driving force.

[0032] A portion of the mass block 34 protrudes towards the elastic member 41 from the side near the elastic member 41 to form a locking portion 341, which is embedded and fixed to the elastic member 41. The mass block 34 is respectively connected to two pole cores 32 located at both ends of the magnetic circuit, and the clamping plate 33 clamps and fixes the magnet 31 and the pole cores 32 to prevent them from falling apart. Optionally, the clamping plate 33 can be a one-piece molded structure.

[0033] The elastic component 4 is disposed within the housing 1 along a second direction perpendicular to the first direction, and the second direction is the Z-axis direction. The elastic component 4 includes an elastic element 41 and an annular support frame 42 for fixing the elastic element 41 to the housing 1.

[0034] The elastic element 41 includes a first fixing part 411 fixedly connected to the oscillator assembly 3, an annular second fixing part 412 fixedly connected to the housing 1, and an elastic connecting part 413 connecting the first fixing part 411 and the second fixing part 412. The elastic element 41 is a silicone elastic element or a rubber elastic element. The snap-fit ​​part 341 is provided with a through hole 3411, and the first fixing part 411 is partially embedded and fixed in the through hole 3411. The mass block 34 and the elastic element 41 are integrally formed.

[0035] Specifically, the first fixing part 411 includes an outer peripheral surface 4111 extending along the first direction. The second fixing part 412 includes an inner peripheral surface 4121 extending along the first direction, a first annular surface 4122 near the vibrator assembly 3, and a plurality of spaced fixing posts 4123 protruding outwards. The center normal direction of the plane containing the first annular surface 4122 is parallel to the first direction. The elastic connecting part 413 is an annular structure extending from the outer peripheral surface 4111 of the first fixing part 411 to the inner peripheral surface 4121 of the second fixing part 412. In this embodiment, the elastic connecting part 413 is an integral annular structure. In other embodiments, the elastic connecting part 413 may also be an annular structure spliced ​​from several sheet-like structures.

[0036] The projection of the first fixing part 411 along the first direction is completely located within the area enclosed by the second fixing part 412. The vibration of the oscillator assembly 3 drives the first fixing part 411 to move along the first direction, thereby causing the center of the elastic connecting part 413 to deform around its periphery to provide a restoring force. The first fixing part 411, the second fixing part 412, and the elastic connecting part 413 can be integrally formed or separately arranged.

[0037] The second fixing part 412 surrounds the first fixing part 411, and the central axis of the first fixing part 411 along the second direction coincides with the central axis of the second fixing part 412 along the second direction. The thickness of the second fixing part 412 in the first direction is greater than the thickness of the first fixing part 411 in the first direction.

[0038] A recess 414 is formed on at least one of the elastic member 41 facing the oscillator assembly 3 and the side of the elastic member 41 facing away from the oscillator assembly 3. Specifically, in this embodiment, the thickness of the elastic connecting portion 413 in the first direction gradually decreases from the second fixing portion 412 to the first fixing portion 411, thereby forming a recess 414 on the surface of the elastic member 41 facing the oscillator assembly 3 and the surface of the elastic member 41 facing away from the oscillator assembly 3. Furthermore, the recess 414 is symmetrically arranged on both sides of the elastic member 41 in the first direction.

[0039] The annular support frame 42 is provided with a plurality of spaced fixing holes 421, and the fixing posts 4123 are fitted into the corresponding fixing holes 421. The annular support frame 42 has an opening 422, the axis of which is parallel to the first direction. The thickness of the annular support frame 42 along the first direction is greater than the thickness of the elastic member 41 along the first direction. The elastic member 41 is located on the side of the annular support frame 42 closer to the oscillator assembly 3, such that the area where the annular support frame 42 is laser welded to the housing 1 is offset from the elastic member 41 in the first direction. Therefore, when high temperatures are generated during welding, the elastic member 41 can be effectively avoided, preventing the elastic member 41 from being damaged by heat. The annular support frame 42 and the elastic member 41 are integrally formed.

[0040] In this embodiment, by providing an annular elastic connecting portion 413 on the elastic member 41, when the oscillator assembly 3 vibrates and drives the first fixing portion 411 to move along the first direction, the center of the elastic connecting portion 413 causes deformation around its periphery to provide restoring force. The elastic member 41 is fixedly connected to the housing 1 through the annular support frame 42, forming lever arms around its periphery, which is suitable for motors with large oscillator masses. The thickness of the elastic connecting portion 413 in the first direction gradually decreases from the second fixing portion 412 to the first fixing portion 411, so that the elastic member 41 forms symmetrically arranged recesses 414 on the side surface facing the oscillator assembly 3 and the side surface facing away from the oscillator assembly 3. This structure can effectively reduce the stress generated by the elastic member 41 during vibration and tension, reducing the risk of breakage. In addition, the annular support frame 42, the elastic member 41, and the mass block 34 adopt an integral molding structure, which significantly reduces the assembly complexity.

[0041] like Figure 6 As shown, the other structures are the same as in Embodiment 1. The difference is that in Embodiment 2, a recess 414a is formed on the side of the elastic member 41a away from the oscillator assembly 3a. Specifically, the first fixing part 411a and the second fixing part 412a are offset along the central axis of the second direction. Specifically, in the second direction, the first fixing part 411a is closer to the mass block 34a than the second fixing part 412a.

[0042] Compared with related technologies, the present invention provides a linear vibration motor, including a housing, a stator assembly fixedly disposed within the housing, an oscillator assembly spaced apart from the stator assembly, and an elastic component suspending the oscillator assembly within the housing. The oscillator assembly reciprocates along a first direction. The elastic component includes an elastic element, which comprises a first fixing part fixedly connected to the oscillator assembly, an annular second fixing part fixedly connected to the housing, and an elastic connecting part connecting the first fixing part and the second fixing part. The first fixing part includes an outer peripheral surface extending along the first direction, and the second fixing part includes an inner peripheral surface extending along the first direction and a first annular surface near the oscillator assembly. The center normal direction of the plane containing the first annular surface is parallel to the first direction. The elastic connecting part is an annular structure extending from the outer peripheral surface of the first fixing part to the inner peripheral surface of the second fixing part. The projection of the first fixing part along the first direction is completely located within the area enclosed by the second fixing part. The vibration of the oscillator assembly drives the first fixing part to move along the first direction, thereby causing the center of the elastic connecting part to deform around its periphery to provide a restoring force. The elastic element of this invention is made of silicone or rubber, which has a low elastic modulus, low hardness, and high elongation, making it more suitable for motor structures with a width of less than 6.0 mm. Furthermore, the annular elastic connection on the elastic element allows it to be used in motors with large vibrator masses. Because the elastic component is fixed to the perimeter of the housing, although the lever arm is short, the lever arm is distributed around the entire perimeter, ensuring even distribution of vibration loads during vibration and resulting in a more stable structure. The recessed portion on the elastic element reduces the stress generated by vibration stretching, lowering the risk of breakage. In addition, the annular support frame, elastic element, and mass block are integrally molded, significantly reducing assembly complexity.

[0043] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A linear vibration motor, comprising a housing, a stator assembly fixedly disposed within the housing, an oscillator assembly spaced apart from the stator assembly, and an elastic assembly suspending the oscillator assembly within the housing, characterized in that, The oscillator assembly reciprocates along a first direction. The elastic component includes an elastic element, which comprises a first fixing portion fixedly connected to the oscillator assembly, an annular second fixing portion fixedly connected to the housing, and an elastic connecting portion connecting the first fixing portion and the second fixing portion. The first fixing portion includes an outer peripheral surface extending along the first direction, and the second fixing portion includes an inner peripheral surface extending along the first direction and a first annular surface near the oscillator assembly. The center normal direction of the plane containing the first annular surface is parallel to the first direction. The elastic connecting portion is an annular structure extending from the outer peripheral surface of the first fixing portion to the inner peripheral surface of the second fixing portion. The projection of the first fixing portion along the first direction is completely located within the area enclosed by the second fixing portion. The elastic element has a recess on at least one side, either the side facing the oscillator assembly or the side away from the oscillator assembly. The depth of the recess corresponding to the portion of the elastic connecting portion gradually increases along the first direction from the second fixing portion to the first fixing portion. The vibration of the oscillator assembly causes the first fixing portion to move along the first direction, thereby causing the center of the elastic connecting portion to deform around its periphery to provide a restoring force.

2. The linear vibration motor according to claim 1, characterized in that, The second fixing part surrounds the first fixing part, and the central axis of the first fixing part along the second direction coincides with the central axis of the second fixing part along the second direction, and the second direction is perpendicular to the first direction.

3. The linear vibration motor according to claim 1, characterized in that, The thickness of the second fixing part in the first direction is greater than the thickness of the first fixing part in the first direction.

4. The linear vibration motor according to claim 3, characterized in that, The thickness of the elastic connection portion in the first direction gradually decreases from the second fixing portion to the first fixing portion.

5. The linear vibration motor according to claim 1, characterized in that, The elastic member has a recessed portion formed on at least one side of the side facing the oscillator assembly and the side away from the oscillator assembly, which is formed by the first fixing portion along the central axis of the second direction and the second fixing portion along the central axis of the second direction being misaligned, wherein the second direction is perpendicular to the first direction.

6. The linear vibration motor according to claim 1, characterized in that, The elastic component includes an annular support frame, and the elastic element is fixed to the housing by the annular support frame.

7. The linear vibration motor according to claim 6, characterized in that, The annular support frame is provided with a number of spaced fixing holes, and the second fixing part protrudes outward to form a number of spaced fixing posts, which are fitted into the corresponding fixing holes.

8. The linear vibration motor according to claim 6, characterized in that, The annular support frame has an opening, the axis of which is parallel to the first direction.

9. The linear vibration motor according to claim 6, characterized in that, The annular support frame and the elastic element are integrally formed.

10. The linear vibration motor according to claim 6, characterized in that, The thickness of the annular support frame along the first direction is greater than the thickness of the elastic element along the first direction.

11. The linear vibration motor according to claim 6, characterized in that, The elastic element is located on the side of the annular support frame near the oscillator assembly.

12. The linear vibration motor according to claim 1, characterized in that, The oscillator assembly includes a mass block, and a portion of the mass block protrudes and extends toward the elastic element from the side near the elastic element to form a snap-fit ​​portion, which is embedded and fixed to the first fixing portion.

13. The linear vibration motor according to claim 12, characterized in that, The mass block and the elastic element are integrally formed.

14. The linear vibration motor according to claim 12, characterized in that, The snap-fit ​​part is provided with a through hole, and the first fixing part is partially embedded and fixed in the through hole.

15. The linear vibration motor according to claim 1, characterized in that, The elastic element is a silicone elastic element or a rubber elastic element.

16. The linear vibration motor according to claim 1, characterized in that, The stator assembly includes a coil fixed to the housing, the winding axis of the coil being parallel to the first direction, and the coil being wound around the outside of the oscillator assembly.

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