A noise reduction device and a wheel

Abstract

This invention discloses a noise reduction device and a wheel, including a housing and a control body disposed within the housing. The housing contains a chamber and an opening. The control body includes a rotating body and a rotating shaft. Specifically, the rotating shaft is coaxially connected to the end of the rotating body, which is disposed within the chamber. A baffle is provided on the outer wall of the rotating body. A resonant cavity is formed between the baffle, the outer wall of the rotating body, and the inner wall of the chamber. The resonant cavity communicates with the opening, and the size of the opening is the same as the size of the resonant cavity. Thus, the resonant cavity forms a quarter-wavelength tube. Therefore, this application converts the change in the axial length of the quarter-wavelength tube into a change in the arc length in space. While maintaining the same spatial volume, it can significantly change the length of the quarter-wavelength tube, which is beneficial for changing the noise reduction frequency of the noise reduction device.

Description

Technical Field

[0001] This invention relates to the field of noise reduction technology, and in particular to a noise reduction device and a wheel. Background Technology

[0002] During normal vehicle operation, the road surface excitation on the wheels and the axle excitation on the wheels due to wheel rotation imbalance can both induce acoustic resonance in the air chambers within the wheels, producing a significant peak between 150Hz and 300Hz. This resonance is then transmitted through the axle and suspension system to the vehicle body structure, subsequently radiating noise into the vehicle interior. The noise characteristics are predominantly low-frequency and narrow-band, with relatively high magnitudes, creating noise interference in the in-vehicle environment and requiring effective control.

[0003] To reduce tire cavity resonance noise, resonant tubes are commonly installed on the wheel rims to mitigate the resonance sound generated by the tire cavity. However, because the condition of each wheel is different during vehicle operation, multiple narrowband high-value noises with different distribution characteristics exist, resulting in a large noise level over a wide frequency band. Therefore, in order to set corresponding muffler combinations with different silencing frequencies for different conditions, it is necessary to collect and study the effects of Helmholtz resonators and / or quarter-wave tubes of different specifications and sizes on wheel vibration damping. However, once the size of the Helmholtz resonator or quarter-wave tube is determined, its corresponding vibration damping frequency is fixed. Therefore, to test the effect of different vibration damper combinations, it is necessary to repeatedly disassemble and install the tire to replace the vibration damper on the wheel rim. However, this operation is very cumbersome, the workload of data collection is huge, the time cost is very high, and the data collection efficiency is extremely low. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a noise reduction device that uses an adjustable structure to change its noise reduction frequency, thereby allowing the noise reduction device to be adjusted directly without removing the tires, thus reducing workload and improving data acquisition efficiency.

[0005] A noise reduction device according to a first aspect of the present invention includes:

[0006] A housing, wherein the housing has a cavity and an opening on the surface;

[0007] The control body includes a rotating body and a rotating shaft. The rotating shaft is coaxially connected to the end of the rotating body. The rotating body is disposed in the cavity. A baffle is provided on the outer side wall of the rotating body. A resonant cavity is formed between the baffle, the outer side wall of the rotating body, and the inner side wall of the cavity. The resonant cavity communicates with the opening. The size of the opening is the same as the size of the resonant cavity.

[0008] The resonant cavity is a quarter-wavelength tube, and the baffle can rotate synchronously with the rotating body to change the length of the resonant cavity.

[0009] According to some embodiments of the present invention, the device further includes: a drive member, a first receiver, and a first controller. The drive member is electrically connected to the first receiver. The first controller is used to transmit a control signal to the first receiver. The first receiver is used to receive the control signal and send a control signal instruction to the drive member. The power output shaft of the drive member is poweredly connected to the rotating shaft to drive the rotating body to rotate.

[0010] According to some embodiments of the present invention, the rotating body is provided with a hollow first cavity, and the side wall of the first cavity is provided with a first through hole for communicating with the resonant cavity. A shielding member is provided at the first through hole for opening or blocking the first through hole.

[0011] According to some embodiments of the present invention, a second cavity is provided in the side wall of the rotating body. An electromagnet is provided on one side of the second cavity, and an elastic element is provided on the other side. A blocking element is provided in the second cavity. The two ends of the elastic element are respectively connected to the blocking element and the side wall of the second cavity. A second through hole is provided on the blocking element. The blocking element is a magnetic element. When the electromagnet is energized, the blocking element slides along the second cavity to one side of the electromagnet under the attraction of the electromagnet. The second through hole communicates with the first through hole. When the electromagnet is de-energized, the second through hole and the first through hole are misaligned and closed.

[0012] According to some embodiments of the present invention, the device further includes: a second receiver and a second controller, wherein the electromagnet is electrically connected to the second receiver, the second controller is used to transmit a control signal to the second receiver, and the second receiver is used to receive the control signal and control the energization and de-energization of the electromagnet.

[0013] A wheel according to a second aspect of the present invention comprises:

[0014] Wheel hub;

[0015] A tire, which is mounted on the rim;

[0016] The mounting component is clamped onto the wheel hub and has multiple first mounting portions.

[0017] The muffler adopts the muffler device of any of the above embodiments, and the muffler further includes a second mounting part, which limits the cooperation with the first mounting part to allow the muffler to be detachably assembled onto the mounting component.

[0018] In some embodiments of the present invention, the number of silencers is multiple.

[0019] According to some embodiments of the present invention, it further includes: a screw, wherein the first mounting portion is a first threaded hole, the second mounting portion is a second threaded hole, and the screw is sequentially inserted into the second threaded hole and the first threaded hole.

[0020] According to some embodiments of the present invention, the inner side of the mounting member that contacts the rim is provided with an anti-slip layer, and the anti-slip layer is provided with anti-slip texture.

[0021] According to some embodiments of the present invention, the anti-slip texture adopts a herringbone groove pattern. Beneficial effects

[0022] This application converts the change in the axial length of a quarter-wavelength tube into a change in the arc length in space. While maintaining the same volume of space occupied, it can greatly change the length of the quarter-wavelength tube. This is not only beneficial for changing the silencing frequency of the silencing device, but also for arranging more silencing devices on the wheel rim. This facilitates the study of the effect of different combinations of vibration damping frequencies on the elimination of different driving noises, and can obtain a wider range of test data on the effects of vibration damping combinations.

[0023] Other additional aspects and advantages of the invention will be set forth in part in the detailed description of the invention below, and in part will be obvious from the description or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic cross-sectional view of a noise reduction device according to a certain embodiment of the present invention. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the structure of a resonant cavity according to a certain embodiment of the present invention;

[0027] Figure 3 This is a schematic cross-sectional view of a noise reduction device according to a certain embodiment of the present invention. Figure 2 ;

[0028] Figure 4 This is a schematic diagram of the structure of a noise reduction device according to another embodiment of the present invention;

[0029] Figure 5 According to another embodiment of the present invention Figure 4 Enlarged view of part A in the middle Figure 1(The first through hole is in a closed state);

[0030] Figure 6 According to another embodiment of the present invention Figure 4 Enlarged view of part A in the middle Figure 2 (The first through hole is in a connected state);

[0031] Figure 7 This is a schematic diagram of the structure of the mounting component according to another embodiment of the present invention.

[0032] Figure label:

[0033] 100. Silencing device;

[0034] 1. Housing; 11. Opening; 2. Control body; 21. Rotating body; 211. First cavity; 212. First through hole; 213. Second cavity; 22. Rotating shaft; 23. Baffle; 24. Resonance cavity; 31. Driving component; 32. First receiver; 33. First controller; 41. Shielding component; 411. Second through hole; 42. Electromagnet; 43. Elastic component; 51. Second receiver; 52. Second controller; 6. Mounting component; 61. First mounting part; 7. Second mounting part; 8. Anti-slip layer. Detailed Implementation

[0035] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0036] The following is for reference. Figures 1 to 7 A noise reduction device 100 according to an embodiment of the present invention is described.

[0037] To facilitate understanding of this invention, a quarter-wavelength tube needs to be described as follows: A quarter-wavelength tube is typically a tubular body closed on one side and open on the other. The cross-sectional shape of a quarter-wavelength tube can be square, circular, or other complex shapes, but the cross-sections of each section inside the tube must remain the same. Its working principle is as follows: utilizing the reflection and interference effects of waves inside the tube, when a wave enters the tube from the opening, it will undergo multiple reflections inside the tube, forming multiple wave peaks or troughs. When the wavelength is exactly one-quarter of the tube length, the wave peaks and troughs will coincide, thus canceling each other out. Therefore, quarter-wavelength tubes of different lengths can eliminate different wavelength frequencies. Since it is a resonant noise cancellation, it can generally only selectively eliminate noise at specific resonant points, resulting in a very narrow frequency band.

[0038] Combination Figures 1 to 3As shown, a noise reduction device 100 according to an embodiment of the present invention includes: a housing 1 and a control body 2 disposed within the housing 1. The housing 1 has a chamber and an opening 11. The control body 2 includes a rotating body 21 and a rotating shaft 22. Specifically, the rotating shaft 22 is coaxially connected to the end of the rotating body 21. The rotating body 21 is disposed within the chamber. A baffle 23 is provided on the outer wall of the rotating body 21. A resonant cavity 24 is formed between the baffle 23, the outer wall of the rotating body 21, and the inner wall of the chamber. The resonant cavity 24 communicates with the opening 11. The size of the opening 11 is the same as the size of the resonant cavity 24. Thus, the resonant cavity 24 forms a quarter-wavelength tube.

[0039] In use, the rotating shaft 22 can be driven to rotate by external force. The rotating shaft 22 will drive the rotating body 21 to rotate. The baffle 23 on the rotating body 21 will rotate synchronously with the rotating body 21. At this time, the rotation of the baffle 23 will change the length of the resonant cavity 24, thereby changing the vibration damping frequency of the resonant cavity 24. Thus, a noise reduction device with a variable vibration damping frequency can replace multiple noise reduction devices with fixed vibration damping frequencies. After such a noise reduction device is installed on the wheel, it does not need to be replaced frequently, which greatly reduces the time cost of data acquisition.

[0040] It is important to note that in order to truly achieve the effect of resonance noise reduction, the length of the resonant cavity 24 must be fully ensured. In particular, if you want to significantly and steplessly change the noise reduction frequency of the quarter-wavelength tube, you need space twice the length of the tube. However, the circumferential space on the rim is limited, so the number of quarter-wavelength tubes that can be arranged in the same circumferential space is very small.

[0041] Therefore, this application transforms the change in the axial length of the quarter-wavelength tube into a change in the arc length in space. While maintaining the same volume of space occupied, it can greatly change the length of the quarter-wavelength tube, which is beneficial for arranging more noise reduction devices on the wheel rim. This facilitates the study of the effect of different combinations of vibration reduction frequencies on the elimination of different driving noises, and can obtain a wider range of vibration reduction combination effect test data. In addition, since the length of each noise reduction device can be infinitely changed, the collected noise reduction combination curves can also be more delicate.

[0042] Furthermore, as one possible implementation of the above embodiments, such as Figure 3As shown, the silencing device 100 also includes a drive unit 31, a first receiver 32, and a first controller 33. The drive unit 31 is electrically connected to the first receiver 32. The first controller 33 is used to transmit control signals to the first receiver 32. The first receiver 32 is used to receive the control signals and send control signal instructions to the drive unit 31. At this time, the power output shaft of the drive unit 31 is poweredly connected to the rotating shaft 22, thereby driving the rotating body 21 to rotate. Thus, the purpose of wireless control and adjustment can be achieved through this structure.

[0043] Specifically, the first controller 33 includes a sensor and a transmitter. The sensor can detect people's operations and convert them into electrical signals, which are then sent to the transmitter. After receiving these signals, the transmitter converts them into radio waves of a specific frequency. The first receiver 32 can receive the radio waves and convert them into electrical signals. After the electrical signals are decoded and processed by the decoder, the received signals are transmitted to the drive unit 31 to complete the corresponding actions.

[0044] Among them, the aforementioned driving component 31 can be a third-order micro-servo motor, such as the model SJ-PXS-012-15. This model of motor has a compact structure and high control precision, which is conducive to its installation on a noise reduction device with limited space. The first controller 33 can be an SM6136 chip module, and the first receiver 32 can be an SM6135 chip module. These two chip modules are integrated modules specifically designed for remote control devices. They are stable in performance, inexpensive, and easy to use directly.

[0045] In addition, a control room is provided on one side of the rotating shaft 22, in which the drive unit 31 and the first receiver 32 can be arranged. The control room can provide a fixed installation position and space for the drive unit 31 and the first receiver 32, and can also protect the drive unit 31, the first receiver 32 and the rotating shaft 22.

[0046] Furthermore, in some embodiments of the present invention, such as Figure 4 As shown, the rotating body 21 has a hollow first cavity 211. A first through-hole 212 is provided on the side wall of the first cavity 211 to connect to the resonant cavity 24. A blocking member 41 is provided at the first through-hole 212 to open or close it. It should be noted that the shape and dimensions of the first through-hole 212 are the same as the cross-sectional dimensions of the resonant cavity 24. Specifically, when the blocking member 41 closes the first through-hole 212, the resonant cavity 24 is not connected to the first cavity 211; at this time, the resonant cavity 24 is still a quarter-wavelength tube. When the blocking member 41 opens the first through-hole 212, the resonant cavity 24 is connected to the first cavity 211. At this time, the resonant cavity 24 and the first cavity 211 together form a Helmholtz silencer.

[0047] It's important to explain here that the Helmholtz silencer operates on a completely different principle than a quarter-wavelength tube. A traditional Helmholtz silencer consists of a closed cavity and a connecting neck tube. When a sound wave is incident, the air inside the neck tube can be considered as a single mass vibrating. The air inside the closed cavity expands and contracts due to the vibration of the air inside the neck tube. Therefore, the Helmholtz resonator can be considered as a spring-mass system with a damping term. When the incident frequency of the sound wave reaches the system's natural frequency, the resonator resonates, exhibiting excellent sound absorption.

[0048] The sound absorption frequency of a traditional Helmholtz silencer depends on the volume of the enclosed cavity, the length of the neck tube, and the cross-sectional area of ​​the neck tube. Once these parameters are determined, its resonant frequency is fixed and cannot be changed with the excitation frequency and environmental conditions. Its resonant frequency band is also relatively narrow. When the excitation frequency changes, the noise reduction effect drops significantly.

[0049] Therefore, in this embodiment, the resonant cavity 24 is equivalent to the neck tube, and the first cavity 211 is equivalent to the closed cavity. When the rotating body 21 rotates, the rotation of the baffle 23 can cause the length of the resonant cavity 24 to change, which is equivalent to causing the length of the neck tube of the Helmholtz muffler to change, thereby changing the silencing frequency of the Helmholtz muffler.

[0050] Furthermore, as one possible implementation of the above embodiments, such as Figures 4 to 6 As shown, a second cavity 213 is provided inside the side wall of the rotating body 21. An electromagnet 42 is provided on one side of the second cavity 213, and an elastic element 43 is provided on the other side. A blocking element 41 is provided inside the second cavity 213. The two ends of the elastic element 43 are respectively connected to the blocking element 41 and the side wall of the second cavity 213. The blocking element 41 is provided with a second through hole 411 and is a magnetic element. When the electromagnet 42 is energized, the blocking element 41 moves along the second cavity under the attraction of the electromagnet 42. Body 213 slides to one side of electromagnet 42. At this time, the second through hole 411 is connected to the first through hole 212, and the resonant cavity 24 can be connected to the first cavity 211 to form a Helmholtz silencer. When electromagnet 42 is de-energized, the blocking member 41 is pulled back to the initial position under the action of the elastic member 43. At this time, the second through hole 411 and the first through hole 212 are misaligned and closed. The resonant cavity 24 and the first cavity 211 are independent of each other, and only the resonant cavity 24 plays the role of a quarter-wavelength tube.

[0051] Furthermore, based on the above embodiments, such as Figure 3As shown, the silencing device 100 also includes a second receiver 51 and a second controller 52. The electromagnet 42 is electrically connected to the second receiver 51. The second controller 52 transmits control signals to the second receiver 51, and the second receiver 51 receives the control signals and controls the energization and de-energization of the electromagnet 42. Using the electromagnet 42 as the control component is low-cost and convenient to use. The second receiver 51 operates on the same principle as the first receiver 32, and the second controller 52 operates on the same principle as the first controller 33; therefore, further details are omitted here.

[0052] According to a second aspect of the present invention, a wheel includes a hub, a tire mounted on the hub, a mounting member 6, and a muffler. The mounting member 6 is clamped onto the hub and has a plurality of first mounting portions 61. The muffler employs a muffler device as described in the above embodiment. The muffler also includes a second mounting portion 7, which is mutually limiting with the first mounting portions 61 for detachable mounting of the muffler onto the mounting member 6.

[0053] Specifically, such as Figure 7 As shown, the mounting piece 6 is strip-shaped, and the two ends of the strip can be fixedly connected by buckles or screws. When in use, the strip-shaped mounting piece 6 is first wrapped around the wheel hub and encircled on the outer surface of the wheel rim. Then, the muffler 100 is detachably connected to the mounting piece 6. This is not only convenient for assembling different numbers of mufflers, but also convenient for maintenance and replacement of new mufflers.

[0054] Furthermore, the number of mufflers is multiple, thus allowing for more diverse combinations of mufflers, such as combinations of quarter-wavelength tubes, combinations of quarter-wavelength tubes with Helmholtz mufflers, and combinations of Helmholtz mufflers with Helmholtz mufflers. Each muffler can also adjust its silencing frequency by changing the size of the resonant cavity 24. This allows for a richer variety of muffler combinations, facilitating a deeper exploration of the influence of different frequencies and types of muffler combinations on the resonant noise of the wheels.

[0055] In some embodiments of the present invention, as shown in the figure, the wheel also includes a screw, the first mounting part 61 is a first threaded hole, the second mounting part 7 is a second threaded hole, and the screw is sequentially inserted into the second threaded hole and the first threaded hole, thereby reliably connecting the muffler and the mounting part 6. Furthermore, the use of the screw and the threaded hole can simplify the structure of the mounting part and reduce the design and use costs of the mounting part.

[0056] In some embodiments of the present invention, such as Figure 7As shown, an anti-slip layer 8 is provided on the inner surface of the mounting part 6 that contacts the wheel rim. The anti-slip layer 8 also has anti-slip textures. The anti-slip layer 8 increases the friction between the mounting part 6 and the wheel rim, preventing the mounting part 6 from sliding due to inertia, thereby improving the reliability of the connection between the mounting part 6 and the wheel rim. At the same time, the anti-slip textures further enhance the anti-slip effect.

[0057] Furthermore, based on the above embodiments, such as Figure 7 As shown, the anti-slip pattern adopts a herringbone toothed groove pattern. This pattern can prevent the mounting part 6 from moving along the circumferential or axial direction of the rim, thereby improving the installation reliability between the mounting part 6 and the rim.

[0058] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 invention.

[0059] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0060] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A noise reduction device, characterized in that, include: A housing, wherein the housing has a cavity and an opening on the surface; A control body includes a rotating body and a rotating shaft. The rotating shaft is coaxially connected to the end of the rotating body. The rotating body is disposed within a cavity. A baffle is provided on the outer side wall of the rotating body. A hollow first cavity is provided inside the rotating body. A first through hole is provided on the side wall of the first cavity for connecting to a resonant cavity. A blocking member is provided at the first through hole for opening or blocking the first through hole. A second cavity is provided inside the side wall of the rotating body. An electromagnet is provided on one side of the second cavity, and an elastic member is provided on the other side. The blocking member is disposed inside the second cavity. The two ends of the elastic member are respectively connected to the blocking member and the side wall of the second cavity. The blocking member is provided with a second through hole and is a magnetic member. When the electromagnet is energized, the blocking member slides along the second cavity to one side of the electromagnet under the attraction of the electromagnet, and the second through hole communicates with the first through hole. When the electromagnet is de-energized, the second through hole and the first through hole are misaligned and closed. A resonant cavity is formed between the baffle, the outer wall of the rotating body, and the inner wall of the chamber. The resonant cavity is connected to the opening, and the size of the opening is the same as the size of the resonant cavity. The resonant cavity is a quarter-wavelength tube. The baffle can rotate synchronously with the rotating body to change the length of the resonant cavity.

2. The silencing device according to claim 1, characterized in that, Also includes: The device includes a drive unit, a first receiver, and a first controller. The drive unit is electrically connected to the first receiver. The first controller is used to transmit control signals to the first receiver. The first receiver is used to receive the control signals and send control signal instructions to the drive unit. The power output shaft of the drive unit is poweredly connected to the rotating shaft to drive the rotating body to rotate.

3. The silencing device according to claim 2, characterized in that, Also includes: The electromagnet is electrically connected to the second receiver, and the second controller is used to transmit control signals to the second receiver. The second receiver is used to receive the control signals and control the energization and de-energization of the electromagnet.

4. A wheel, characterized in that, include: Wheel hub; A tire, which is mounted on the rim; The mounting component is clamped onto the wheel hub and has multiple first mounting portions. A muffler, wherein the muffler employs a muffler device as described in any one of claims 1 to 3, and the muffler further includes a second mounting portion, the second mounting portion being mutually limiting and cooperating with the first mounting portion for detachable assembly of the muffler onto the mounting component.

5. A wheel according to claim 4, characterized in that, The number of silencers is multiple.

6. A wheel according to claim 4, characterized in that, Also includes: The screw has a first mounting part that is a first threaded hole and a second mounting part that is a second threaded hole, and the screw is sequentially inserted into the second threaded hole and the first threaded hole.

7. A wheel according to claim 4, characterized in that, The inner surface of the mounting component that contacts the wheel hub is provided with an anti-slip layer, and the anti-slip layer is provided with anti-slip texture.

8. A wheel according to claim 7, characterized in that, The anti-slip texture adopts a herringbone serrated pattern.

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