vibration exciter

Abstract

This application relates to a vibration exciter, including a housing and a magnetic circuit assembly disposed within the housing, a voice coil movably cooperating with the magnetic circuit assembly to generate vibration, and a spring and a spring plate with a different structural form from the spring. The spring and the spring plate are spaced apart within the housing along the vibration axis of the magnetic circuit assembly. The vibration exciter designed in this application, by employing a heterogeneous suspension structure combining a high-rigidity spring plate and a flexible spring, combines the high support and fatigue resistance characteristics of the spring plate with the long-stroke linear guidance function of the spring plate. This effectively overcomes the defects of existing single suspension elements that are prone to fatigue failure under high loads, enabling the exciter to withstand higher power to achieve stronger vibration intensity, and significantly improving the reliability and service life of long-term operation. At the same time, the overall structure is compact and easy to install in limited spaces.

Description

Technical Field

[0001] This application relates to the field of exciter technology, and in particular to a vibration exciter. Background Technology

[0002] In the current technology, as consumers' demands for in-car entertainment experiences continue to rise, traditional speaker systems are finding it difficult to meet high-end needs in terms of low-frequency performance and sound field creation. Therefore, vibration exciters are increasingly being used in car cabins. These devices can convert audio electrical signals into perceptible mechanical vibrations, which, when installed on seats, floors, or door panels, allow passengers to directly experience the rhythm of music, the explosions of movies, or simulated road bumps, thus greatly enriching the sensory experience of driving and riding.

[0003] A typical vibration exciter usually includes a magnetic circuit assembly that generates a magnetic field, a voice coil that moves under the force of the magnetic field, and a suspension system to support the voice coil and related vibrating components. However, in practical design, there is an inherent contradiction between strong vibration and long-term reliability. To achieve stronger vibration and deeper low-frequency response, the suspension system must allow the vibrating components to make larger strokes, i.e., large axial displacement. This large stroke will generate enormous and repetitive mechanical stress on the suspension system. For traditional spiders, even with a double spider structure to distribute the load, the materials themselves have fatigue limits. After long-term high-power operation, the spider is prone to losing its original elasticity due to material fatigue, resulting in poor centering of the vibrating components, significant attenuation of vibration, and even tearing and complete failure in extreme cases. Utility Model Content

[0004] To address the aforementioned issues, this application provides a vibration exciter that achieves strong vibration while extending service life.

[0005] To achieve the above objectives, the vibration exciter designed in this application includes a housing and a magnetic circuit assembly disposed within the housing, as well as a voice coil movably cooperating with the magnetic circuit assembly to generate vibration. It also includes a spring and a spring plate with a structural form different from the spring. The spring and the spring plate are spaced apart within the housing along the vibration axis of the magnetic circuit assembly. The inner edges of both the spring and the spring plate are connected to the magnetic circuit assembly; the outer edges of both the spring and the spring plate are connected to the inner wall surface of the housing, so that the magnetic circuit assembly is suspended within the housing.

[0006] Preferably, the spring sheet is an integrally formed flat or shallow dish-shaped metal spring sheet; the spring wave is a flexible component with continuous concentric corrugations.

[0007] Preferably, the spring includes an inner ring portion and an outer ring portion arranged concentrically, and at least two flexible arms connected between the inner ring portion and the outer ring portion, the flexible arms extending along a non-radial bending path.

[0008] Preferably, the flexible arm is defined by a plurality of circumferentially extending arcuate through slots opened on the spring sheet, and the plurality of flexible arms are arranged in a rotationally symmetrical manner.

[0009] Preferably, the spring is disposed on the top side of the magnetic circuit assembly, and the spring wave is disposed on the bottom side of the magnetic circuit assembly; wherein, the stiffness of the spring is greater than the stiffness of the spring wave.

[0010] Preferably, the magnetic circuit assembly includes a magnetic cup, a magnet, and a magnetic plate. The magnetic plate is bonded to the magnetic cup by the magnet to form a magnetic circuit. The circumferential surfaces of the magnetic plate and the magnet are spaced apart from the inner wall of the magnetic cup to form a magnetic gap. The voice coil is coaxially arranged with the magnetic gap, and at least part of the top side of the voice coil is placed within the magnetic gap.

[0011] Preferably, the housing includes a base and a top cover that are detachably connected by a snap-fit ​​structure. The base is provided with a PCB board and an external wiring harness. The voice coil is fixed on the base, and the lead wires of the voice coil and the external wiring harness are connected by soldering to the PCB board.

[0012] Preferably, the inner wall surface of the outer shell is provided with an annular protrusion, the outer edge of the spring is bonded and fixed to the lower surface of the annular protrusion, and the outer edge of the spring piece is bonded and fixed to the upper surface of the annular protrusion.

[0013] Preferably, the inner ring portion of the spring is bonded and fixed to the top of the magnetic cup, and the top of the magnetic cup is provided with a platform portion concentrically arranged with the spring, the platform portion extending into the inner ring portion.

[0014] Preferably, the housing is detachably connected to a base via a snap-fit ​​structure, and the base is provided with multiple claw hooks on its periphery.

[0015] The vibration exciter designed in this application adopts a heterogeneous suspension structure that combines a high-rigidity spring sheet with a flexible wave spring. This combines the high support and fatigue resistance of the spring sheet with the long-stroke linear guidance function of the wave spring, effectively overcoming the defect of easy fatigue failure of existing single suspension elements under high loads. This allows the exciter to withstand higher power to achieve stronger vibration intensity and significantly improves the reliability and service life of long-term operation. At the same time, the overall structure is compact and easy to install in a limited space. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the vibration exciter provided in the embodiments of this application.

[0017] Figure 2 This is a schematic diagram of the planar structure of the vibration exciter provided in the embodiment of this application.

[0018] Figure 3 yes Figure 2 Sectional view at point AA.

[0019] Figure 4 This is a schematic diagram of the structure of the spring provided in the embodiment of this application.

[0020] The components include: outer shell 10, base 11, top cover 12, PCB board 13, external wiring harness 14, annular protrusion 15, magnetic circuit assembly 20, magnetic cup 21, platform 211, magnet 22, magnetic plate 23, voice coil 30, spring 40, spring 50, inner ring 51, outer ring 52, flexible arm 53, arc-shaped through groove 54, base 60, claw hook 61, and buffer pad 70. Detailed Implementation

[0021] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0022] like Figures 1 to 4 As shown, the vibration exciter described in this embodiment mainly includes a housing 10 as a support and housing structure, a magnetic circuit assembly 20 for generating a constant magnetic field, and a voice coil 30 as a vibration source. The housing 10 contains a spring wave 40 and a spring sheet 50.

[0023] Specifically, the housing 10 defines an internal mounting space in which the magnetic circuit assembly 20 and the voice coil 30 are both disposed. The spring wave 40 and the spring piece 50 are structurally different and are spaced apart within the housing 10 along the vibration axis of the magnetic circuit assembly 20. The inner edges of the spring wave 40 and the spring piece 50 are both connected to the magnetic circuit assembly 20. The outer edges of the spring wave 40 and the spring piece 50 are both connected to the inner wall of the housing 10, so that the magnetic circuit assembly 20 is suspended within the housing 10.

[0024] Specifically, such as Figure 3 , Figure 4As shown, the spring sheet 50 is an integrally formed flat or shallow dish-shaped metal spring sheet, ensuring high rigidity and excellent fatigue resistance; while the spring wave 40 is a flexible part made of composite materials such as NOMEX or CONEX with continuous concentric corrugations, ensuring the large linear stroke required for vibration. In terms of assembly position, the spring sheet 50 is located on the top side of the magnetic circuit assembly 20, and the spring wave 40 is located on the bottom side of the magnetic circuit assembly 20. In terms of performance, the stiffness of the spring sheet 50 is greater than that of the spring wave 40, thus forming a functional complementarity. The spring sheet 50 provides the main radial support force and restoring force, ensuring that the magnetic circuit assembly 20 can still maintain precise centering during severe vibration and prevent swaying; the spring wave 40 is mainly responsible for guiding the magnetic circuit assembly 20 to perform smooth axial linear movement.

[0025] In some embodiments, such as Figure 4 As shown, the spring piece 50 includes an inner ring portion 51 and an outer ring portion 52 arranged concentrically, and at least two flexible arms 53 connecting the inner ring portion 51 and the outer ring portion 52, wherein the flexible arms 53 extend along a non-radial bending path. In a specific implementation, as... Figure 4 As shown, the flexible arm 53 is defined by a plurality of circumferentially extending arcuate through slots 54 opened on the spring piece 50, and the plurality of flexible arms 53 are arranged in a rotationally symmetrical manner, thereby providing the compliance required for axial movement while ensuring strong radial rigidity.

[0026] In some embodiments, such as Figure 3 As shown, the magnetic circuit assembly 20 includes a U-shaped magnetic cup 21, a cylindrical magnet 22, and a disc-shaped magnetic plate 23. The magnetic plate 23 is bonded to the magnetic cup 21 by the magnet 22 to form a magnetic circuit. The circumferential surfaces of the magnetic plate 23 and the magnet 22 are spaced apart from the inner wall of the magnetic cup 21 to form a magnetic gap. The voice coil 30 is coaxially arranged with the magnetic gap, and at least part of the top side of the voice coil 30 is placed within the magnetic gap to ensure effective reception of the magnetic field.

[0027] In some embodiments, such as Figure 3 As shown, the housing 10 includes a base 11 and a top cover 12 detachably connected by a snap-fit ​​structure. A PCB board 13 and an external wiring harness 14 are mounted on the base 11. The voice coil 30 is fixed to the base 11, and the leads of the voice coil 30 are soldered to the external wiring harness 14 for conduction, ultimately connecting to an external audio signal source via the external wiring harness 14. During operation, external audio signals are transmitted to the voice coil 30 through the external wiring harness 14 and the PCB board 13.

[0028] In some embodiments, such as Figure 3As shown, to achieve precise and secure installation of the suspension system, an annular protrusion 15 is integrally formed on the inner wall of the outer casing 10. The outer edge of the spring 40 is fixed to the lower surface of the annular protrusion 15 by adhesive, while the outer edge of the spring piece 50 is bonded to the upper surface of the annular protrusion 15. Simultaneously, the inner ring portion 51 of the spring piece 50 is also bonded to the top of the magnetic cup 21. To further improve alignment accuracy, a cylindrical platform 211 concentric with the spring piece 50 is also provided on the top of the magnetic cup 21. This platform 211 can extend into the inner ring portion 51 of the spring piece 50 during assembly, serving a precise positioning function.

[0029] In some embodiments, such as Figure 1 As shown, a base 60 is detachably connected to the outer shell 10 via a snap-fit ​​structure. The base 60 has multiple claw hooks 61 on its periphery, which can conveniently grip the wire mesh or other fixed structures at the installation position.

[0030] The vibration exciter provided in this application adopts a heterogeneous suspension structure that combines a high-rigidity spring sheet with a flexible wave, combining the high support and fatigue resistance of the spring sheet with the long stroke linear guidance function of the wave. This effectively overcomes the defect of easy fatigue failure of existing single suspension elements under high load, enabling the exciter to withstand higher power to achieve stronger vibration intensity, and significantly improving the reliability and service life of long-term operation. At the same time, the overall structure is compact and easy to install in a limited space.

[0031] In the description of this application, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] Finally, it should be noted that the above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A vibration exciter comprising a housing and a magnetic circuit assembly disposed within the housing, and a voice coil in movable cooperation with the magnetic circuit assembly to produce vibrations, characterized by, It also includes a spring and a spring plate that are structurally different from the spring. The spring and the spring plate are spaced apart within the housing along the vibration axis of the magnetic circuit assembly. The inner edges of the spring and the spring plate are both connected to the magnetic circuit assembly. The outer edges of the spring and the spring plate are both connected to the inner wall of the housing, so that the magnetic circuit assembly is suspended within the housing.

2. The vibration exciter of claim 1, wherein The spring sheet is a one-piece molded flat or shallow dish-shaped metal spring sheet; the spring wave is a flexible component with continuous concentric corrugations.

3. A vibration exciter according to claim 1 or 2, characterised in that, The spring includes an inner ring and an outer ring arranged concentrically, and at least two flexible arms connected between the inner ring and the outer ring, the flexible arms extending along a non-radial bending path.

4. The vibration exciter of claim 3, wherein The flexible arm is defined by a plurality of circumferentially extending arcuate slots opened on the spring sheet, and the plurality of flexible arms are arranged in a rotationally symmetrical manner.

5. The vibration exciter of claim 1 or 2, wherein The spring sheet is disposed on the top side of the magnetic circuit assembly, and the spring wave is disposed on the bottom side of the magnetic circuit assembly; wherein, the stiffness of the spring sheet is greater than the stiffness of the spring wave.

6. The vibration exciter of claim 3, wherein The magnetic circuit assembly includes a magnetic cup, a magnet, and a magnetic plate. The magnetic plate is bonded to the magnetic cup by the magnet to form a magnetic circuit. The circumferential surfaces of the magnetic plate and the magnet are spaced apart from the inner wall of the magnetic cup to form a magnetic gap. The voice coil is coaxially arranged with the magnetic gap, and at least part of the top side of the voice coil is placed in the magnetic gap.

7. The vibration exciter of claim 4 wherein, The housing includes a base and a top cover that are detachably connected by a snap-fit ​​structure. A PCB board and an external wiring harness are provided on the base. The voice coil is fixed on the base, and the lead wires of the voice coil and the external wiring harness are connected by soldering to the PCB board.

8. The vibration exciter of claim 4, wherein The inner wall of the outer shell is provided with an annular protrusion. The outer edge of the spring is bonded and fixed to the lower surface of the annular protrusion, and the outer edge of the spring piece is bonded and fixed to the upper surface of the annular protrusion.

9. The vibration exciter of claim 6, wherein The inner ring of the spring is bonded and fixed to the top of the magnetic cup. The top of the magnetic cup is provided with a platform concentric with the spring, and the platform extends into the inner ring.

10. The vibration exciter of claim 1, wherein The outer shell is detachably connected to a base via a snap-fit ​​structure, and the base has multiple claw hooks on its periphery.

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