Linear vibration motor spring with asymmetric multi-section bending elastic arms

Abstract

The invention relates to the technical field of motor springs, and particularly discloses a linear vibration motor spring with an asymmetric multi-section bending elastic arm, which comprises an elastic sheet body, a C-shaped elastic groove is formed in the elastic sheet body, and a central main elastic arm is formed in the middle of the elastic sheet body based on the formation of the C-shaped elastic groove. Side auxiliary elastic arms are arranged on two sides of the central main elastic arm on the elastic sheet body; the end, connected with the central main elastic arm, of the elastic piece body is a main elastic piece end, the other end of the elastic piece body is an auxiliary elastic piece end, the auxiliary elastic piece end is parallel to the main elastic piece end, the S-shaped bending of the central main elastic arm dominates axial vibration, the h-shaped bending of the side auxiliary elastic arm generates transverse auxiliary vibration, and the three elastic arms cooperate to form a three-dimensional vibration coupling effect. The fatigue life is prolonged through the multi-section bending stress dispersion design, the industrial problems of thickness limitation, performance requirements and cost control are solved at the same time through a single spring, and a benchmark-level solution is provided for a consumer electronics micro vibration system.

Description

Technical Field

[0001] The present invention relates to the technical field of motor springs, and in particular to a linear vibration motor spring with asymmetric multi-section bent elastic arms. Background Art

[0002] Micro vibration motors are essential components in the electronics, automotive, and home appliance industries, providing users with tactile feedback and vibration reminders. Linear motors are simple in structure and suitable for high-speed linear motion; the spring structure is a key component of linear motors.

[0003] However, the existing springs have the following disadvantages:

[0004] Plane springs require additional space to achieve vibration travel, and when the thickness is ≤0.2mm, the effective amplitude is generally <0.5mm;

[0005] Severe stress concentration: Single-point bending structures are prone to stress concentration at the root (finite element analysis shows a stress coefficient of >2.5), resulting in a fatigue life of typically <100,000 cycles;

[0006] Single vibration direction: Existing solutions mostly rely on single-dimensional deformation, making it difficult to achieve XYZ three-dimensional composite vibration (the lateral vibration component is usually <15%). Summary of the Invention

[0007] The object of the present invention is to provide a linear vibration motor spring with asymmetric multi-section bent elastic arms to solve the above-mentioned problems.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A linear vibration motor spring with asymmetric multi-section bent elastic arms includes a spring body with a C-shaped elastic groove formed on the spring body. The C-shaped elastic groove forms a central main elastic arm in the middle of the spring body, and side auxiliary elastic arms are located on both sides of the central main elastic arm on the spring body.

[0010] The end of the spring body connected to the central main spring arm is the main spring end, and the other end of the spring body is the auxiliary spring end.

[0011] As a further solution of the present invention: the side auxiliary elastic arm is provided with an auxiliary end bending area, a first-order plate, a first-order bending area, an intermediate plate, a second-order bending area, a second-order plate, a C-shaped bending area and an auxiliary arm connecting plate in sequence from the auxiliary elastic arm end to the main elastic plate end.

[0012] As a further solution of the present invention: the bending angle of the C-shaped bending zone is 167°-173°;

[0013] The bending angle of the secondary end bending zone is 12°-18°;

[0014] The bending angle of the first-order bending zone is 12°-18°;

[0015] The bending angle of the second-order bending zone is 7°-13°.

[0016] As a further solution of the present invention: the bending direction of the secondary end bending zone is the same as the bending direction of the C-shaped bending zone;

[0017] The bending direction of the first-order bending zone is opposite to the bending direction of the C-shaped bending zone;

[0018] The bending direction of the second-order bending zone is the same as the bending direction of the C-shaped bending zone.

[0019] As a further solution of the present invention: the end of the central main elastic arm away from the main elastic piece end is an elastic piece welding area;

[0020] The central main elastic arm is provided with a main arm front bending area, a main arm connecting piece and a main arm rear bending area in sequence from the elastic piece welding area to the main elastic piece end.

[0021] As a further solution of the present invention: the bending angle of the rear bending zone of the main arm is 22°-28°;

[0022] The bending angle of the front bending area of ​​the main arm is 17°-23°.

[0023] As a further solution of the present invention: the bending direction of the rear bending zone of the main arm is opposite to the bending direction of the front bending zone of the main arm.

[0024] As a further solution of the present invention: the bending direction of the rear bending zone of the main arm is opposite to the bending direction of the C-shaped bending zone.

[0025] As a further solution of the present invention: both sides of the C-shaped elastic groove close to the auxiliary elastic piece end are scissor-type inclined surfaces, and the angle of the scissor-type inclined surfaces is 25°.

[0026] As a further solution of the present invention: the auxiliary shrapnel end is parallel to the main shrapnel end.

[0027] Beneficial effects of the present invention:

[0028] (1) In this solution, the central main elastic arm 2 and the side auxiliary elastic arm 3 in the spring body 1 are bent in various regions. The S-shaped bending of the central main elastic arm 3 leads to the main axial (Z-direction) vibration, and the H-shaped bending of the side auxiliary elastic arm 3 produces the lateral (X / Y-direction) auxiliary vibration. The three elastic arms work together to form a three-dimensional vibration coupling effect. When welded, the flat welding surface on the central main elastic arm 2 ensures the Z-direction positioning, and the H-shaped welding end of the side auxiliary elastic arm 3 ensures the X / Y-direction positioning. The free height of the entire spring is 1.58 mm, the installation height during installation is 1.34 mm, and the working height during elastic vibration is 1.0 mm.

[0029] (2) In the spring design of this solution, a vibration stroke of 1.2mm is achieved at an extreme thickness of 0.1mm (an increase of 140% compared to the traditional solution), meeting the demand for ultra-thin vibration modules for smart wearable / folding screen mobile phones; through the coordinated deformation of the main and auxiliary elastic arms, XYZ three-dimensional composite vibration is generated (the lateral vibration component reaches 15%, while the traditional solution is less than 5%); the multi-section bending stress dispersion design of the main and auxiliary elastic arms makes the fatigue life exceed 500,000 times (the traditional solution is about 100,000 times), reducing the after-sales failure rate by 80%; the 170° reverse bending structure absorbs instantaneous impact energy, and the drop test pass rate is increased to 99.8%; the gradient stiffness design covers the full frequency band of 50-250Hz (the traditional solution has a frequency bandwidth of only ±15Hz), adapting to scenarios such as game touch / system feedback; the vibration energy transmission efficiency reaches more than 85% (the traditional solution is about 60%), significantly extending the device life;

[0030] (3) During the production process, the spring is simplified, and the stamping is done in one step, which reduces three adjustment steps and reduces the production cost by 30%. The bending angle tolerance is controlled at ±0.5°, and the mass production consistency reaches 99% (about 90% for traditional solutions). The yield is improved: the 1.34mm installation height is suitable for mainstream motor structures without modifying the overall machine design. The material is versatile: the SUS301-H stainless steel solution can be replaced with new materials such as titanium alloy to expand the application scenarios. The single-piece spring solves the industry problems of "thickness limitation-performance requirements-cost control" at the same time, providing a benchmark solution for consumer electronics micro-vibration systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below with reference to the accompanying drawings.

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention Figure 1 ;

[0033] Figure 2 This is a schematic diagram of the overall structure of the present invention Figure 2 ;

[0034] Figure 3 It is a side view schematic diagram of the overall structure of the present invention.

[0035] In the figure: 1. Spring clip body; 10. C-shaped elastic groove; 100. Scissor fork inclined surface; 11. Auxiliary spring clip end; 12. Main spring clip end; 2. Side auxiliary spring arm; 21. Auxiliary end bending area; 22. First-order plate; 23. First-order bending area; 24. Middle plate; 25. Second-order bending area; 26. Second-order plate; 27. C-shaped bending area; 28. Auxiliary arm connecting plate; 3. Central main spring arm; 31. Main arm rear bending area; 32. Main arm connecting plate; 33. Main arm front bending area; 34. Spring clip welding area. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] See also Figure 1-Figure 3 As shown, the present invention is a linear vibration motor spring with asymmetric multi-section bent elastic arms, including a spring body 1, a C-shaped elastic groove 10 is formed on the spring body 1, and the central portion of the spring body 1 forms a central main elastic arm 3 based on the formation of the C-shaped elastic groove 10. The spring body 1 is located on both sides of the central main elastic arm 3 as side auxiliary elastic arms 2.

[0038] The connecting end of the spring body 1 and the central main spring arm 3 is the main spring end 12, and the other end of the spring body 1 is the auxiliary spring end 11, which is parallel to the main spring end 12;

[0039] The "one main, two auxiliary" three-arm configuration is adopted. The central main arm (0.65mm wide) features a bidirectional S-shaped bend (25° upward bend + 20° downward bend). The side auxiliary arms (0.4mm wide) feature four-stage H-shaped gradient bends (including a 170° reverse bend). These special-shaped bends create a gradient stiffness distribution between the arms.

[0040] About the specific bending method:

[0041] The side auxiliary elastic arm 2 is provided with an auxiliary end bending area 21, a first-order plate 22, a first-order bending area 23, an intermediate plate 24, a second-order bending area 25, a second-order plate 26, a C-shaped bending area 27 and an auxiliary arm connecting plate 28 in sequence from the auxiliary elastic arm end 11 to the main elastic plate end 12; among them, the bending angle of the C-shaped bending area 27 is 170°, the bending angle of the auxiliary end bending area 21 is 15°, and the bending direction of the auxiliary end bending area 21 is the same as the bending direction of the C-shaped bending area 27, the bending angle of the first-order bending area 23 is 15°, and the bending direction of the first-order bending area 23 is opposite to the bending direction of the C-shaped bending area 27, the bending angle of the second-order bending area 25 is 10°, and the bending direction of the second-order bending area 25 is the same as the bending direction of the C-shaped bending area 27.

[0042] The end of the central main elastic arm 3 away from the main elastic fragment end 12 is a spring fragment welding area 34. The central main elastic arm 3 is provided with a main arm front bending area 33, a main arm connecting piece 32 and a main arm rear bending area 31 in sequence from the spring fragment welding area 34 to the main elastic fragment end 12. The bending angle of the main arm rear bending area 31 is 25°, and the bending angle of the main arm front bending area 33 is 20°. The bending direction of the main arm rear bending area 31 is opposite to the bending direction of the main arm front bending area 33, and the bending direction of the main arm rear bending area 31 is opposite to the bending direction of the C-shaped bending area 27;

[0043] The central main elastic arm 2 and the side auxiliary elastic arm 3 in the elastic body 1 are bent in different areas by the above bending method. The S-shaped bending of the central main elastic arm 3 leads to the axial (Z-direction) vibration, and the H-shaped bending of the side auxiliary elastic arm 3 produces the lateral (X / Y-direction) auxiliary vibration. The three elastic arms work together to form a three-dimensional vibration coupling effect.

[0044] When welded, the flat welding surface on the central main elastic arm 2 ensures Z-axis positioning, and the H-shaped welding end of the side auxiliary elastic arm 3 ensures X / Y-axis positioning. The free height of the entire spring is 1.58mm, the installed height during installation is 1.34mm, and the working height during elastic vibration is 1.0mm;

[0045] The two sides of the C-shaped elastic groove 10 close to the auxiliary spring plate end 11 are scissor-type inclined surfaces 100, and the angle of the scissor-type inclined surfaces 100 is 25 degrees;

[0046] The spring design in this solution achieves a vibration stroke of 1.2mm at a maximum thickness of 0.1mm (a 140% increase over traditional solutions), meeting the demand for ultra-thin vibration modules in smart wearables and foldable phones.

[0047] The coordinated deformation of the main and auxiliary arms generates XYZ three-dimensional composite vibration (the lateral vibration component reaches 15%, while the traditional solution is less than 5%).

[0048] The multi-section bending stress dispersion design of the main and auxiliary arms increases the fatigue life to over 500,000 times (compared to approximately 100,000 times with traditional solutions), reducing the after-sales failure rate by 80%;

[0049] The 170° flex structure absorbs instantaneous impact energy, and the drop test pass rate is increased to 99.8%;

[0050] The gradient stiffness design covers the full frequency range of 50-250Hz (the bandwidth of traditional solutions is only ±15Hz), adapting to scenarios such as gaming touch and system feedback.

[0051] The vibration energy transmission efficiency reaches over 85% (traditional solutions are about 60%), significantly extending the device's battery life.

[0052] The spring's production process is simplified, with one-step stamping and forming, eliminating three adjustment steps and reducing production costs by 30%. Furthermore, the bending angle tolerance is controlled to ±0.5°, achieving a mass production consistency of 99% (compared to approximately 90% for traditional solutions), improving yield.

[0053] The 1.34mm installation height is compatible with mainstream motor structures without modifying the overall design. Material versatility: The SUS301-H stainless steel solution can be replaced with new materials such as titanium alloy to expand application scenarios.

[0054] The monolithic spring simultaneously solves the industry challenges of "thickness limitation, performance requirements, and cost control," providing a benchmark solution for consumer electronics micro-vibration systems.

[0055] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A linear vibration motor spring with an asymmetric multi-section bent elastic arm, characterized in that: The invention comprises a spring clip body (1), wherein a C-shaped elastic groove (10) is provided on the spring clip body (1), and a central main elastic arm (3) is formed in the middle of the spring clip body (1) due to the provision of the C-shaped elastic groove (10), and side auxiliary elastic arms (2) are located on both sides of the central main elastic arm (3) on the spring clip body (1); The connecting end of the shrapnel body (1) and the central main elastic arm (3) is the main shrapnel end (12), and the other end of the shrapnel body (1) is the auxiliary shrapnel end (11).

2. The linear vibration motor spring with asymmetric multi-section bent elastic arms according to claim 1, characterized in that: The side auxiliary elastic arm (2) is provided with an auxiliary end bending area (21), a first-order plate (22), a first-order bending area (23), an intermediate plate (24), a second-order bending area (25), a second-order plate (26), a C-shaped bending area (27) and an auxiliary arm connecting plate (28) in sequence from the auxiliary elastic arm end (11) to the main elastic plate end (12).

3. The linear vibration motor spring with asymmetric multi-section bent elastic arms according to claim 2, characterized in that: The bending angle of the C-shaped bending area (27) is 167°-173°; The bending angle of the secondary end bending zone (21) is 12°-18°; The bending angle of the first-order bending zone (23) is 12°-18°; The bending angle of the second-order bending zone (25) is 7°-13°.

4. The linear vibration motor spring with asymmetric multi-section bent elastic arms according to claim 3, characterized in that: The bending direction of the secondary end bending area (21) is the same as the bending direction of the C-shaped bending area (27); The bending direction of the first-order bending zone (23) is opposite to the bending direction of the C-shaped bending zone (27); The bending direction of the second-order bending zone (25) is the same as the bending direction of the C-shaped bending zone (27).

5. The linear vibration motor spring with asymmetric multi-section bent elastic arms according to claim 4, characterized in that: The end of the central main elastic arm (3) away from the main elastic piece end (12) is an elastic piece welding area (34); The central main elastic arm (3) is provided with a main arm front bending area (33), a main arm connecting piece (32) and a main arm rear bending area (31) in sequence from the elastic piece welding area (34) to the main elastic piece end (12).

6. The linear vibration motor spring with asymmetric multi-section bent elastic arms according to claim 5, characterized in that: The bending angle of the rear bending area (31) of the main arm is 22°-28°; The bending angle of the main arm front bending area (33) is 17°-23°.

7. The linear vibration motor spring with asymmetric multi-section bent elastic arms according to claim 6, characterized in that: The bending direction of the main arm rear bending area (31) is opposite to the bending direction of the main arm front bending area (33).

8. The linear vibration motor spring with asymmetric multi-section bent elastic arms according to claim 7, characterized in that: The bending direction of the main arm rear bending area (31) is opposite to the bending direction of the C-shaped bending area (27).

9. The linear vibration motor spring with asymmetric multi-section bent elastic arms according to claim 8, characterized in that: The two sides of the C-shaped elastic groove (10) close to the auxiliary elastic piece end (11) are scissor-fork inclined surfaces (100), and the angle of the scissor-fork inclined surfaces (100) is 25 degrees.

10. The linear vibration motor spring with asymmetric multi-section bent elastic arms according to claim 9, characterized in that: The auxiliary shrapnel end (11) is parallel to the main shrapnel end (12).

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