A dynamic vibration absorber

Abstract

This application discloses a dynamic vibration absorber, including a housing for connection and fixation. The housing includes a base and an outer cover, with the outer cover fitting onto the base to form an installation area within the housing. The installation area is equipped with a vibration-absorbing component, which includes an elastic element. The dynamic vibration absorber also includes a stiffness adjustment component linked to the vibration-absorbing component. The stiffness adjustment component includes a drive component and a rotating component pulsatingly connected to the drive component. The rotating component abuts against the elastic element, and the drive component drives the rotating component to rotate, providing radial pressure to the elastic element. When the drive component drives the rotating component to rotate, the rubber block abutting against the rotating component experiences radial pressure from the rotating component, changing its compression. Different rotation angles of the rotating component result in different degrees of radial pressure on the elastic element, thus changing the compression of the elastic element and altering the operating frequency of the vibration-absorbing component, enabling the vibration absorber to adjust its operating frequency under different working conditions.

Description

Technical Field

[0001] This application belongs to the field of vehicle component technology, specifically relating to a dynamic vibration absorber. Background Technology

[0002] Dynamic vibration absorbers are vibration reduction mechanisms frequently used in many industries such as automotive, construction, and aerospace. In automotive NVH (Noise, Vibration, and Harshness), there are narrow-band NVH problems. Due to engineering limitations, it is often impossible to directly modify the structure. In such cases, using dynamic vibration absorbers is a good choice for vibration reduction. In an existing spring-mass system, one or more additional spring-mass systems with different degrees of freedom can be added. When the natural frequency of the additional spring-mass system matches the frequency of the excitation force, it will act as a vibration absorber, thereby reducing the vibration of the main mass.

[0003] Existing dynamic vibration absorbers generally consist of a mass block and rubber damping pads. Once the product leaves the factory, its mass and stiffness parameters are already determined and are only single values. Its operating frequency is also determined accordingly, and it can only work for a certain narrow frequency band. If the problem frequency of the whole vehicle changes, it is necessary to redesign and readjust the product design parameters, re-produce, or select vibration absorbers of other frequencies, resulting in cost waste. Utility Model Content

[0004] This application provides a dynamic vibration absorber that solves the problem that existing dynamic vibration absorbers can only function for a narrow frequency band and are inconvenient to adjust the operating frequency.

[0005] The technical solution adopted in this application is as follows: a dynamic vibration absorber includes a housing for connection and fixation. The housing includes a base and an outer cover. The outer cover covers the base to form an installation area inside the housing. The installation area is provided with a vibration absorption component. The vibration absorption component includes an elastic element. The dynamic vibration absorber also includes a stiffness adjustment component that is linked with the vibration absorption component. The stiffness adjustment component includes a drive component and a rotating component that is pulsatorically connected to the drive component. The rotating component abuts against the elastic element. The drive component drives the rotating component to rotate to provide radial pressure to the elastic element.

[0006] In a preferred embodiment, the elastic element includes a rubber block with a cylindrical hole, and the vibration damping assembly includes a mass block disposed in the cylindrical hole and a limiting cap that is vulcanized integrally with the rubber block, the limiting cap abutting against the rotating element.

[0007] In one preferred embodiment, the rotating component includes a frequency adjustment ring, the vibration absorption component is disposed in the inner ring of the frequency adjustment ring, and the driving component is disposed in the outer ring of the frequency adjustment ring.

[0008] In a preferred embodiment, the inner wall of the frequency adjustment ring is provided with a protrusion, and the limiting cap abuts against the protrusion.

[0009] In a preferred embodiment, the base is provided with a limiting block, the rotating component is sleeved on the outside of the limiting block and rotates relative to the limiting block, the bottom wall of the limiting cap abuts against the inner wall of the rotating component, and the side wall of the limiting cap abuts against the limiting block.

[0010] In a preferred embodiment, the limiting blocks are provided with multiple circumferentially spaced blocks, and the limiting caps are located between two adjacent limiting blocks and abut against the sidewalls of the adjacent limiting blocks.

[0011] In one preferred embodiment, the drive assembly includes a drive motor and a worm shaft that is drively connected to the output end of the drive motor, and the frequency adjustment ring is provided with worm teeth adapted to the worm shaft.

[0012] In a preferred embodiment, the outer cover is provided with a mounting base connected to the drive motor and a protective shell sleeved on the outside of the worm shaft.

[0013] In a preferred embodiment, the dynamic vibration absorber further includes a vibration sensor disposed on the base, the vibration sensor being exposed outside the outer cover.

[0014] In one preferred embodiment, the base is provided with a plurality of lugs, and the lugs are provided with connecting holes to fix the base to the vibration damping device.

[0015] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0016] (1) The proposed solution isolates and protects the vibration-absorbing component through a shell, avoiding external assembly interference and ensuring stable operation of the vibration-absorbing component. The stiffness of the vibration-absorbing component is adjusted by a stiffness adjustment component, thereby changing the operating frequency of the vibration-absorbing component and achieving vibration absorption and reduction effect. When the drive component drives the rotating part to rotate, the elastic element that abuts against the rotating part is subjected to radial pressure from the rotating part and changes its compression. Different rotation angles of the rotating part will result in different degrees of radial pressure on the rubber block. By applying different driving forces or different displacements to the rotating part, the drive component can change the rotation amount of the rotating part, thereby changing the compression amount of the elastic element and changing the operating frequency of the vibration-absorbing component, enabling the vibration absorber to adjust its operating frequency under different working conditions.

[0017] (2) The rubber block is protected by the limiting cap. The frequency adjustment ring abuts against the limiting cap. When the frequency adjustment ring rotates, the limiting cap that abuts against it is subjected to radial pressure during the rotation of the frequency adjustment ring. The rubber block that is integrated with the limiting cap is also subjected to radial pressure. It is compressed as the frequency adjustment ring rotates. The amount of compression of the rubber block can be different depending on the amount of rotation of the frequency adjustment ring, thereby realizing the adjustment of the working frequency of the vibration absorption component.

[0018] (3) By setting a protrusion on the inner wall of the frequency adjustment ring that is compatible with and abuts the limit cap, the assembly between the vibration absorption component and the frequency adjustment ring is guided. When the frequency adjustment ring rotates, the limit cap can be subjected to the rotational pressure of the protrusion at the first moment, causing the rubber block to undergo rapid compression deformation.

[0019] (4) The present application solution sets a limiting block on the base to limit the vibration absorption component and the rotating component on the base. The limiting cap is located between the two limiting blocks and abuts against the limiting blocks. When the limiting cap is subjected to the radial pressure of the rotating component and has a radial tendency to move, the limiting blocks on both sides limit its position, so that the limiting cap cannot follow the rotating component to rotate. As a result, when the rotating component rotates through different angles, the limiting cap is subjected to different pressures because it cannot move, which causes the rubber block to deform with different compression. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is a schematic diagram of the external structure of the vibration absorber in one embodiment of the present invention;

[0022] Figure 2 This is an exploded view of the vibration absorber in one embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the base structure in one embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the frequency adjustment ring in one embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the outer cover in one embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the assembly structure of the vibration absorber in one embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the initial compression of the rubber block in one embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the intermediate compression of the rubber block in one embodiment of the utility model;

[0029] Figure 9 This is a schematic diagram of the ultimate compression of the rubber block in one embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100-Base, 110-Limiting block, 120-Leg, 121-Connecting hole;

[0032] 200 - Outer cover, 210 - Mounting base, 211 - Bolt, 220 - Protective shell;

[0033] 300--Vibration damping component, 310--Rubber block, 311--Cylindrical hole, 320--Mass block, 330--Limiting cap;

[0034] 400 - Rotating component, 410 - Frequency adjustment ring, 411 - Protrusion, 412 - Worm gear;

[0035] 500 - Drive assembly, 510 - Drive motor, 520 - Worm shaft;

[0036] 600-Vibration sensor. Detailed Implementation

[0037] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0038] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0039] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0042] This application provides a dynamic vibration absorber, such as... Figures 1 to 9 As shown, the device includes a housing for connection and fixation. The housing includes a base 100 and an outer cover 200. The outer cover 200 covers the base 100 to form an installation area inside the housing. The installation area is provided with a vibration damping assembly 300. The vibration damping assembly 300 includes an elastic element. The power vibration damper also includes a stiffness adjustment assembly linked to the vibration damping assembly 300. The stiffness adjustment assembly includes a drive assembly 500 and a rotating element 400 that is pulsatorically connected to the drive assembly 500. The rotating element 400 abuts against the elastic element. The drive assembly 500 drives the rotating element 400 to rotate to provide radial pressure to the elastic element.

[0043] This application solution isolates and protects the vibration-absorbing component 300 through a shell, avoiding external assembly interference and ensuring the stable operation of the vibration-absorbing component 300. The stiffness of the vibration-absorbing component 300 is adjusted by a stiffness adjustment component, thereby changing the operating frequency of the vibration-absorbing component 300 to achieve vibration absorption and reduction. When the drive component 500 drives the rotating component 400 to rotate, the elastic element abutting against the rotating component 400 is subjected to radial pressure from the rotating component 400, changing its compression. Different rotation angles of the rotating component 400 result in different degrees of radial pressure on the rubber block 310. By applying different driving forces or different displacements to the rotating component 400, the drive component 500 can change the rotation amount of the rotating component 400, thereby changing the compression of the elastic element and thus changing the operating frequency of the vibration-absorbing component 300, enabling the vibration absorber to adjust its operating frequency under different working conditions.

[0044] It should be noted that the outer cover 200 and the base 100 can be connected and fixed by existing connection methods, such as welding.

[0045] In one embodiment, such as Figure 2 As shown, the elastic element includes a rubber block 310, which has a cylindrical hole 311. The vibration damping assembly 300 includes a mass block 320 disposed in the cylindrical hole 311 and a limiting cap 330 vulcanized integrally with the rubber block 310. The limiting cap 330 abuts against the rotating element 400.

[0046] Understandably, elastic elements can also be made using other methods such as springs.

[0047] Furthermore, such as Figure 2 , Figure 4 As shown, the rotating component 400 includes a frequency adjustment ring 410, a vibration damping component 300 disposed in the inner ring of the frequency adjustment ring 410, and a driving component 500 disposed in the outer ring of the frequency adjustment ring 410.

[0048] The rubber block 310 is protected by the limiting cap 330. The frequency adjustment ring 410 abuts against the limiting cap 330. When the frequency adjustment ring 410 rotates, the limiting cap 330 abuts against it is subjected to radial pressure during the rotation of the frequency adjustment ring 410. The rubber block 310, which is integrated with the limiting cap 330, is also subjected to radial pressure and is compressed as the frequency adjustment ring 410 rotates. The amount of compression of the rubber block 310 can be different depending on the amount of rotation of the frequency adjustment ring 410, thereby realizing the adjustment of the working frequency of the vibration absorption component 300.

[0049] In one embodiment, such as Figure 4 As shown, the inner wall of the frequency adjustment ring 410 is provided with a protrusion 411, and the limiting cap 330 abuts against the protrusion 411.

[0050] By providing a protrusion 411 on the inner wall of the frequency adjustment ring 410 that fits and abuts against the limiting cap 330, the assembly between the vibration absorption component 300 and the frequency adjustment ring 410 is guided. When the frequency adjustment ring 410 rotates, the limiting cap 330 is immediately subjected to the rotational pressure of the protrusion 411, causing the rubber block 310 to undergo rapid compression deformation.

[0051] In one embodiment, such as Figure 3 As shown, the base 100 is provided with a limiting block 110, the rotating member 400 is sleeved on the outside of the limiting block 110 and rotates relative to the limiting block 110, the bottom wall of the limiting cap 330 abuts against the inner wall of the rotating member 400, and the side wall of the limiting cap 330 abuts against the limiting block 110.

[0052] Preferably, multiple limiting blocks 110 are spaced apart circumferentially, and the limiting cap 330 is located between two adjacent limiting blocks 110 and abuts against the sidewalls of the adjacent limiting blocks 110.

[0053] By setting a limiting block 110 on the base 100, the vibration damping component 300 and the rotating component 400 are limited on the base 100. The limiting cap 330 is located between the two limiting blocks 110 and abuts against the limiting blocks 110. When the limiting cap 330 is subjected to the radial pressure of the rotating component 400 and has a tendency to move radially, the limiting blocks 110 on both sides limit its position, so that the limiting cap 330 cannot rotate with the rotating component 400. As a result, when the rotating component 400 rotates through different angles, the limiting cap 330 is subjected to different amounts of pressure because it cannot move, which causes the rubber block 310 to deform with different amounts of compression.

[0054] In one embodiment, such as Figure 2 As shown, the drive assembly 500 includes a drive motor 510, a worm shaft 520 that is connected to the output end of the drive motor 510, and a frequency adjustment ring 410 that is provided with worm teeth 412 adapted to the worm shaft 520.

[0055] The drive battery drives the worm shaft 520 to rotate, and the worm shaft 520 meshes with the worm gear 412, thereby driving the frequency adjustment ring 410 to rotate. The rotation amount of the frequency adjustment ring 410 is adjusted by the relative movement distance between the worm shaft 520 and the worm gear 412. During its rotation, the rubber block 310 is limited and cannot follow the rotation. Therefore, under different rotation amounts, the rubber block 310 can be subjected to different pressures, resulting in different compression amounts.

[0056] The drive motor 510 rotates, causing the worm shaft 520 to rotate. The worm shaft 520 meshes with the worm gear 412, which in turn pushes the frequency adjustment ring 410 to rotate around its axis relative to the base 100 and the outer cover 200. The protrusion 411 inside the frequency adjustment ring 410 that contacts the limiting cap 330 also rotates with the frequency adjustment ring 410. The protrusion 411 generates a gradually increasing radial centripetal pressure on the limiting cap 330 during rotation. Under the limiting action of the limiting block 110 of the base 100, the limiting cap 330 is pushed to move radially toward the center, generating radial pressure on the rubber block 310, compressing it and changing its stiffness, thereby changing the working frequency of the vibration absorption system.

[0057] Understandably, existing drive technologies such as hydraulic drive can also be used for the drive components.

[0058] Figures 7 to 9 This is a schematic diagram of the compression of rubber block 310. The arrow in the diagram indicates the rotation direction of the frequency adjustment ring 410. When the rubber block 310 is initially compressed in the vibration absorption system, its diameter is h1. As the frequency adjustment ring 410 rotates, the rubber block 310 reaches the intermediate compression amount, at which point the diameter is h2. When compressed to its limit, the diameter is h3.

[0059] Preferably, such as Figure 2 , Figure 5 , Figure 6 As shown, the outer cover 200 is provided with a mounting base 210 connected to the drive motor 510 and a protective shell 220 sleeved on the outside of the worm shaft 520.

[0060] The drive motor 510 is fixed to the housing by the mounting bracket 210. The fixing method can be the bolt 211 connection as shown in the figure. At the same time, a protective shell 220 is set on the outer cover 200 to cover and protect the worm shaft 520 and worm gear 412 to avoid external interference.

[0061] In one embodiment, the dynamic vibration absorber further includes a vibration sensor 600 disposed on the base 100, which is exposed outside the outer cover 200. Real-time vibration data is acquired by the vibration sensor 600 and transmitted to the data processing system. The problem frequency of the vibration problem is obtained based on the acquired vibration data. The operating frequency of the vibration absorber system is calculated based on a pre-stored correspondence between the problem frequency and the operating frequency of the vibration absorber system. Based on the calculated operating frequency, the required compression amount of the rubber block 310 is calculated according to a pre-stored correspondence between the compression amount of the rubber block 310 and the operating frequency. The required rotation angle signal of the motor is obtained based on a pre-stored correspondence between the compression amount of the rubber block 310 and the motor rotation angle, and this rotation angle signal is transmitted to the drive motor 510. The drive motor 510 drives the worm shaft 520 to rotate by the corresponding angle, thereby compressing the rubber block 310 to the set compression amount, enabling the vibration absorber system to achieve vibration absorption and reduction effects at a suitable operating frequency. Based on different vibration data, the drive motor 510 can be rotated at different angles, causing the rubber block 310 to generate different amounts of compression, thus realizing the variable operating frequency of the vibration absorption system and adapting to the vibration absorption operating frequency requirements under various conditions.

[0062] In one embodiment, the base 100 is provided with a plurality of lugs 120, and the lugs 120 are provided with connecting holes 121 to fix the base 100 to the vibration damping device. Connecting fasteners, such as screws, are provided at the lugs 120 to fix the vibration absorber.

[0063] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0064] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0065] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A dynamic vibration absorber, characterized in that, The device includes a housing for connection and fixation, the housing including a base (100) and an outer cover (200), the outer cover (200) covering the base (100) to form an installation area inside the housing, the installation area being provided with a vibration damping assembly (300), the vibration damping assembly (300) including an elastic element, the dynamic vibration damper also including a stiffness adjustment assembly linked to the vibration damping assembly (300), the stiffness adjustment assembly including a drive assembly (500) and a rotating member (400) pulsatingly connected to the drive assembly (500), the rotating member (400) abutting against the elastic element, the drive assembly (500) driving the rotating member (400) to rotate to provide radial pressure to the elastic element.

2. The dynamic vibration absorber according to claim 1, characterized in that, The elastic element includes a rubber block (310) with a cylindrical hole (311). The vibration damping assembly (300) includes a mass block (320) disposed in the cylindrical hole (311) and a limiting cap (330) vulcanized integrally with the rubber block (310). The limiting cap (330) abuts against the rotating element (400).

3. The dynamic vibration absorber according to claim 2, characterized in that, The rotating component (400) includes a frequency adjustment ring (410), the vibration absorption component (300) is disposed in the inner ring of the frequency adjustment ring (410), and the driving component (500) is disposed in the outer ring of the frequency adjustment ring (410).

4. The dynamic vibration absorber according to claim 3, characterized in that, The inner wall of the frequency adjustment ring (410) is provided with a protrusion (411), and the limiting cap (330) abuts against the protrusion (411).

5. The dynamic vibration absorber according to claim 2, characterized in that, The base (100) is provided with a limiting block (110). The rotating member (400) is sleeved on the outside of the limiting block (110) and rotates relative to the limiting block (110). The bottom wall of the limiting cap (330) abuts against the inner wall of the rotating member (400), and the side wall of the limiting cap (330) abuts against the limiting block (110).

6. The dynamic vibration absorber according to claim 5, characterized in that, The limiting blocks (110) are provided with multiple circumferentially spaced, and the limiting caps (330) are located between two adjacent limiting blocks (110) and abut against the side walls of the adjacent limiting blocks (110).

7. The dynamic vibration absorber according to claim 3, characterized in that, The drive assembly (500) includes a drive motor (510) and a worm shaft (520) that is connected to the output end of the drive motor (510). The frequency adjustment ring (410) is provided with worm teeth (412) that are adapted to the worm shaft (520).

8. The dynamic vibration absorber according to claim 7, characterized in that, The outer cover (200) is provided with a mounting base (210) connected to the drive motor (510) and a protective shell (220) sleeved on the outside of the worm shaft (520).

9. The dynamic vibration absorber according to claim 1, characterized in that, The dynamic vibration absorber also includes a vibration sensor (600) disposed on the base (100), and the vibration sensor (600) is exposed on the outer cover (200).

10. The dynamic vibration absorber according to claim 1, characterized in that, The base (100) is provided with a plurality of lugs (120), and the lugs (120) are provided with connecting holes (121) to fix the base (100) to the vibration damping device.

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