Noise reduction wheel structure capable of suppressing broadband structure road noise

Abstract

The invention discloses a noise-reducing wheel structure capable of inhibiting broadband structure road noise, and the noise-reducing wheel structure is characterized in that a rim is internally provided with a hollow area; the hollow area is divided into a plurality of Helmholtz resonant cavities by the first partition plates, and a plurality of first mounting holes are formed in the wall body, close to the tire side, of the rim; the plurality of second partition plates are distributed in the plurality of Helmholtz resonant cavities to divide the plurality of Helmholtz resonant cavities into a plurality of sub resonant cavities respectively; each second partition plate is provided with a second mounting hole for communicating the two sub resonant cavities on the two sides of the second partition plate; the plurality of first sound nozzles are embedded and fixed in the plurality of first mounting holes, and each first sound nozzle is communicated with the tire cavity and one sub resonant cavity of the corresponding Helmholtz resonant cavity; and the plurality of second sound nozzles are embedded and fixed in the second mounting holes of the plurality of second partition plates. According to the noise reduction wheel structure, the noise reduction effect on tire cavity resonance noise can be improved, and the noise reduction frequency band of the noise reduction wheel structure can be obviously widened.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle noise reduction, and in particular to a noise reduction wheel structure capable of suppressing broadband structural road noise. Background Art

[0002] The noise inside a car has a great impact on ride comfort, and it mainly comes from: power system noise, tire / road noise, and wind resistance noise. Due to the rapid development of power system vibration and noise reduction technology and the widespread use of electric vehicles, the contribution of automobile power system noise to interior noise has been greatly reduced, and the contribution of tire / road noise to automobile noise has become increasingly prominent. Therefore, the focus of NVH research and development work of automobile manufacturers is gradually shifting to the field of tire / road noise control. As a component in direct contact with the road surface, the tire, under the excitation of the road surface, transmits the energy of tire vibration and noise to the car body through structures such as wheels and suspension systems, radiates noise in the car, and finally reaches the human ear. This is called structure-borne road noise.

[0003] When the car is driving, the excitation of the road surface causes the tire vibration to have a wide frequency band, which is enough to cover the natural frequency of the tire cavity, causing the tire cavity to resonate and produce tire cavity resonance noise. The energy of this noise is transmitted to the car through structural components such as wheels, suspension, and body, and is finally sensed in the car. It is generally within the frequency range of 170-250Hz, with a narrow frequency band and high energy density, which has a great impact on the acoustic environment in the car. It also varies for different tire-wheel assemblies and is related to vehicle speed, load, temperature, etc., so it is difficult to suppress. The energy of other frequency vibrations of the tire is transmitted to the rim through two paths: the sidewall and the tire cavity, and then further transmitted to the car through the same structural path mentioned above, which also affects the acoustic environment in the car.

[0004] The wheel is the first part in the path of structural road noise propagating into the vehicle, and its road noise suppression performance directly affects the noise level inside the vehicle. It is highly feasible, cost-controlled and economical to control the noise inside the vehicle by optimizing the design of the wheel to suppress road noise. The wheel rim is located in the annular cavity area between the two aluminum alloy rings. The annular cavity area is close to the connection between the rim and the spoke. Therefore, a Helmholtz resonator (HR for short, or resonator) can be designed in the annular cavity area. The strong frequency selectivity of HR can be used to suppress the resonance noise of the tire cavity in a targeted manner.

[0005] In existing engineering applications, two aluminum alloy rings are welded together by a stir friction welding process to form a wheel rim, and the annular hollow area between the two aluminum alloy rings is used to form multiple classical resonant cavities through partitions, and small holes are arranged on the wall of the wheel rim close to the tire side to install a sound mouth with a cylindrical inner cavity, thereby forming a classical resonant cavity group. The classical resonant cavity has a sound mouth and a cavity, so it is also called a single-degree-of-freedom resonant cavity. By optimizing the geometric dimensions of the classical resonant cavity and the group formed by it (the length and cross-sectional area of ​​the cavity, the length and radius of the sound mouth), the tire cavity resonance noise can be suppressed.

[0006] The single-degree-of-freedom resonant cavity results in only one peak frequency in the frequency band that requires noise reduction, that is, its transmission loss frequency response curve has only one peak, so it can only be used to reduce noise within the frequency band of tire cavity resonance noise; taking into account the change in the frequency of tire cavity resonance noise, multiple classic resonant cavities with different resonance frequencies are designed to form a group. The comprehensive effect of the group can meet the noise reduction needs of the tire cavity resonance noise with changing frequency and enhance the noise reduction effect on the tire cavity resonance noise.

[0007] However, in engineering practice, there is a strong demand for suppressing tire cavity resonance noise and other frequency road noise. Although the existing technology of embedding a Helmholtz resonant cavity in the wheel can reduce the tire cavity resonance noise, the effect is not enough and needs to be further improved; and the noise reduction structure of the existing technology has a single noise reduction frequency, which can only suppress the tire cavity resonance noise, and cannot suppress the road noise of a wider frequency, that is, other frequency bands. Summary of the invention

[0008] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a noise reduction wheel structure that can suppress broadband structural road noise, which can not only improve the noise reduction effect on tire cavity resonance noise, but also significantly broaden its noise reduction frequency band.

[0009] A noise reduction wheel structure capable of suppressing broadband structure-based road noise according to an embodiment of the present invention comprises:

[0010] A rim having an annular hollow area therein;

[0011] A plurality of first baffles, which are arranged in the hollow area and divide the hollow area into a plurality of Helmholtz resonance cavities in the circumferential direction of the rim, and a plurality of first mounting holes corresponding to the plurality of Helmholtz resonance cavities are arranged on the wall of the rim close to the tire side;

[0012] A plurality of second partitions, wherein the plurality of second partitions are distributed in the plurality of Helmholtz resonant cavities, and the plurality of Helmholtz resonant cavities are respectively divided into a plurality of sub-resonant cavities; each of the second partitions is provided with a second mounting hole for connecting the two sub-resonant cavities on both sides thereof;

[0013] A plurality of first sound mouthpieces, wherein the plurality of first sound mouthpieces are embedded in the plurality of first mounting holes in a one-to-one correspondence, and each of the first sound mouthpieces is connected to a tire cavity and one of the plurality of sub-resonance cavities of the corresponding Helmholtz resonant cavity;

[0014] A plurality of second sound mouthpieces are embedded in the second mounting holes of the plurality of second partitions in a one-to-one correspondence.

[0015] According to the noise reduction wheel structure capable of suppressing broadband structural road noise according to the embodiment of the present invention, on the basis of the existing classic Helmholtz resonance cavity noise reduction wheel, a second partition with a second sound mouth is added in each Helmholtz resonance cavity, so that each Helmholtz resonance cavity has multiple sub-resonance cavities, a first sound mouth and at least one embedded second sound mouth, forming an embedded multi-degree-of-freedom resonance cavity. Based on the derived multi-degree-of-freedom resonance cavity theoretical calculation formula and simulation results, under the premise of occupying the same total volume of the hollow area, the embedded multi-degree-of-freedom resonance cavity can significantly and effectively improve the tire cavity resonance noise reduction effect of the original technology, and at the same time, it can also produce a noise reduction effect on one or more other additional design frequency bands, thereby achieving the suppression of broadband structural road noise, which is of great significance to the control of vehicle interior noise.

[0016] In some embodiments, the length of the second sound mouth is greater than or equal to the thickness of the second partition.

[0017] In some embodiments, both ends or one end of the second sound mouthpiece protrudes from the second baffle, or both ends of the second sound mouthpiece are flush with the second baffle.

[0018] In some embodiments, the inner cavity cross-sectional shape of the first sound mouthpiece and the inner cavity cross-sectional shape of the second sound mouthpiece are circular or non-circular.

[0019] In some embodiments, the inner cavity cross-sectional shape of the first sound mouthpiece and the inner cavity cross-sectional shape of the second sound mouthpiece are petal-shaped or elliptical.

[0020] In some embodiments, the inner cavity cross-section of the first sound mouthpiece and the inner cavity cross-section of the second sound mouthpiece are equal cross-sections or non-equal cross-sections in their respective axial directions.

[0021] In some embodiments, the inner cavity cross-sections of the first sound mouthpiece and the inner cavity cross-sections of the second sound mouthpiece are gradually expanding and contracting in their respective axial directions.

[0022] In some embodiments, the inner cavity shape of the first sound mouthpiece and the inner cavity shape of the second sound mouthpiece are the same or different.

[0023] In some embodiments, the first sound mouthpiece extends into the corresponding sub-resonance cavity.

[0024] In some embodiments, the first mounting hole is a stepped hole, the inner diameter of one end of the first mounting hole away from the corresponding sub-resonance cavity is larger than the inner diameter of the other end close to the corresponding sub-resonance cavity, and the outer shape of the first sound mouthpiece is adapted to the shape of the first mounting hole.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 A schematic diagram of a noise reduction wheel structure capable of suppressing broadband structured road noise according to an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of a partial cross-section of a rim of a noise reduction wheel structure capable of suppressing broadband structural road noise according to an embodiment of the present invention;

[0029] Figure 3 A partial cross-sectional schematic diagram of a noise reduction wheel structure capable of suppressing broadband structure-based road noise according to an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of a first sound mouth of a noise reduction wheel structure capable of suppressing broadband structural road noise according to an embodiment of the present invention;

[0031] Figure 5 A partial cross-sectional schematic diagram of a noise reduction wheel structure capable of suppressing broadband structure-based road noise according to another embodiment of the present invention;

[0032] Figure 6 A schematic diagram of a first baffle of a noise reduction wheel structure capable of suppressing broadband structure-borne road noise according to an embodiment of the present invention;

[0033] Figure 7 A schematic diagram of a second baffle of a noise reduction wheel structure capable of suppressing broadband structure-borne road noise according to an embodiment of the present invention;

[0034] Figure 8 FIG. 1 is a schematic diagram of a second baffle of a noise reduction wheel structure capable of suppressing broadband structure-borne road noise according to another embodiment of the present invention.

[0035] Reference numerals:

[0036] Rim 1; hollow area 101; sub-resonant cavity 1011; first mounting hole 103; first partition plate 2; second partition plate 3; second mounting hole 301; first sound mouth 4; second sound mouth 5. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] Combine the following Figures 1 to 8 The noise reduction wheel structure capable of suppressing broadband structure-based road noise according to an embodiment of the present invention is described.

[0039] like Figures 1 to 8 As shown, the noise reduction wheel structure capable of suppressing broadband structural road noise according to an embodiment of the present invention includes a rim 1, a plurality of first baffles 2, a plurality of second baffles 3, a plurality of first sound mouths 4, and a plurality of second sound mouths 5.

[0040] The rim 1 has an annular hollow area 101 therein.

[0041] A plurality of first baffles 2 are arranged in the hollow area 101, and the hollow area 101 is divided into a plurality of Helmholtz resonance cavities in the circumferential direction of the rim 1; specifically, the profile of the first baffles 2 is consistent with the cross-sectional profile of the hollow area 101, and the plurality of first baffles 2 are fixed in the hollow area 101 at intervals along the circumferential direction of the rim 1, such as the plurality of first baffles 2 can be directly formed in the rim 1 during the casting process, and the hollow area 101 is divided into a plurality of Helmholtz resonance cavities that are not connected to each other, that is, both ends of each Helmholtz resonance cavity are closed and airtight. A plurality of first mounting holes 103 corresponding to the plurality of Helmholtz resonance cavities are provided on the wall of the rim 1 close to the tire side; that is, the rim 1 has a plurality of first mounting holes 103 on the wall close to the tire side, and each Helmholtz resonance cavity has a first mounting hole 103 for mounting the first sound mouth 4.

[0042] Multiple second baffles 3 are distributed in multiple Helmholtz resonant cavities. For example, multiple second baffles 3 are directly formed in the rim 1 during the casting process, and the multiple Helmholtz resonant cavities are respectively divided into multiple sub-resonant cavities 1011; specifically, the contour of the second baffle 3 is consistent with the cross-sectional contour of the hollow area 101, and the multiple second baffles 3 are fixed in the multiple Helmholtz resonant cavities at intervals along the circumferential direction of the rim 1, that is, there is at least one second baffle 3 in each Helmholtz resonant cavity, and at least one second baffle 3 divides the corresponding Helmholtz resonant cavity into multiple sub-resonant cavities 1011. For example, in the same Helmholtz resonant cavity, one or two second baffles 3 (such as Figure 1 As shown), three, the Helmholtz resonant cavity is correspondingly divided into two sub-resonant cavities 1011 (as shown Figure 1 As shown in the figure), three sub-resonance cavities 1011 or four sub-resonance cavities 1011, the number of second baffles 3 in the same Helmholtz resonant cavity is not specifically limited, and the number of second baffles 3 in different Helmholtz resonant cavities can be the same or different, and can be set according to actual needs. Each second baffle 3 is provided with a second mounting hole 301 for connecting the two sub-resonance cavities 1011 on both sides thereof, and the second mounting hole 301 is used to mount the second sound mouthpiece 5.

[0043] The plurality of first sound mouthpieces 4 are embedded in the plurality of first mounting holes 103 in a one-to-one correspondence, and each of the first sound mouthpieces 4 communicates with the tire cavity and one of the plurality of sub-resonance cavities 1011 of the corresponding Helmholtz resonant cavity.

[0044] The plurality of second sound mouthpieces 5 are embedded in the second mounting holes 301 of the plurality of second partition plates 3 in a one-to-one correspondence.

[0045] According to the noise reduction wheel structure capable of suppressing broadband structural road noise according to the embodiment of the present invention, on the basis of the existing classic Helmholtz resonance cavity noise reduction wheel, a second partition 3 with a second sound mouth 5 is added in each Helmholtz resonance cavity, so that each Helmholtz resonance cavity has multiple sub-resonance cavities 1011 and a first sound mouth 4 and at least one embedded second sound mouth 5, forming an embedded multi-degree-of-freedom resonance cavity. Based on the derived multi-degree-of-freedom resonance cavity theoretical calculation formula and simulation results, under the premise of occupying the same total volume of the hollow area 101, the embedded multi-degree-of-freedom resonance cavity can significantly and effectively improve the tire cavity resonance noise reduction effect of the original technology, and at the same time, it can also produce a noise reduction effect on one or more other additional design frequency bands, thereby achieving the suppression of broadband structural road noise, which is of great significance to the control of vehicle interior noise.

[0046] In some embodiments, the length of the second sound mouth 5 is greater than or equal to the thickness of the second partition 3. This is conducive to adjusting the total acoustic impedance characteristics of the multi-degree-of-freedom resonance cavity to the optimum, so as to achieve a broadband and efficient structure-borne road noise suppression effect.

[0047] In some embodiments, both ends or one end of the second sound mouth 5 protrude from the second baffle 3, or both ends of the second sound mouth 5 are flush with the second baffle 3. This is conducive to adjusting the total acoustic impedance characteristics of the multi-degree-of-freedom resonant cavity to the optimum, so as to achieve a broadband and efficient structure-borne road noise suppression effect. In some embodiments, the inner cavity cross-sectional shape of the first sound mouth 4 and the inner cavity cross-sectional shape of the second sound mouth 5 are circular or non-circular. This is conducive to adjusting the total acoustic impedance characteristics of the multi-degree-of-freedom resonant cavity to the optimum, so as to achieve a broadband and efficient structure-borne road noise suppression effect.

[0048] In some embodiments, the inner cavity cross-sectional shape of the first sound mouth 4 and the inner cavity cross-sectional shape of the second sound mouth 5 are petal-shaped or elliptical, thereby facilitating the adjustment of the total acoustic impedance characteristics of the multi-degree-of-freedom resonance cavity to the optimum, so as to achieve a broadband and efficient structure-borne road noise suppression effect.

[0049] In some embodiments, the inner cavity cross-section of the first sound mouth 4 and the inner cavity cross-section of the second sound mouth 5 are equal cross-sections or unequal cross-sections in the respective axial directions. This is conducive to adjusting the total acoustic impedance characteristics of the multi-degree-of-freedom resonance cavity to the optimum, so as to achieve a broadband and efficient structure-borne road noise suppression effect.

[0050] In some embodiments, the inner cavity cross-sections of the first sound mouth 4 and the inner cavity cross-sections of the second sound mouth 5 are gradually expanded and contracted in the respective axial directions, thereby facilitating the adjustment of the total acoustic impedance characteristics of the multi-degree-of-freedom resonance cavity to the optimum, so as to achieve a broadband and efficient structure-borne road noise suppression effect.

[0051] In some embodiments, the inner cavity shape of the first sound mouth 4 is the same as or different from the inner cavity shape of the second sound mouth 5. This is helpful to adjust the total acoustic impedance characteristics of the multi-degree-of-freedom resonance cavity to the optimum, so as to achieve a broadband and efficient structure-borne road noise suppression effect.

[0052] In some embodiments, Figure 2 and Figure 3 As shown, the first mounting hole 103 is a stepped hole, the inner diameter of one end of the first mounting hole 103 away from the corresponding sub-resonance cavity 1011 is larger than the inner diameter of the other end close to the corresponding sub-resonance cavity 1011, and the outer shape of the first sound mouthpiece 4 is adapted to the shape of the first mounting hole 103. Therefore, the installation is convenient.

[0053] In some embodiments, the first sound mouth 4 extends into the corresponding sub-resonance cavity 1011. This is helpful to adjust the total acoustic impedance characteristics of the multi-degree-of-freedom resonance cavity to the optimum, so as to achieve a broadband and efficient structure-borne road noise suppression effect.

[0054] In some embodiments, the second mounting hole on the second partition plate 3 may be a cylindrical hole (eg Figure 7 as shown) or stepped holes (as Figure 8 As shown), the second mouthpiece 5 is easy to install.

[0055] It should be noted that the noise reduction wheel structure capable of suppressing broadband structural road noise in the embodiment of the present invention can adjust the total acoustic impedance characteristics of the multi-degree-of-freedom resonance cavity to the optimum through the design of multiple degrees of freedom, such as the length of the second sound mouth 5, the inner cavity shapes of the first sound mouth 4 and the second sound mouth 5, so as to achieve a broadband and efficient structural road noise suppression effect.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A noise reduction wheel structure capable of suppressing broadband structure-borne road noise, characterized in that: include: A rim having an annular hollow area therein; A plurality of first baffles, which are arranged in the hollow area and divide the hollow area into a plurality of Helmholtz resonance cavities in the circumferential direction of the rim, and a plurality of first mounting holes corresponding to the plurality of Helmholtz resonance cavities are arranged on the wall of the rim close to the tire side; A plurality of second partitions, wherein the plurality of second partitions are distributed in the plurality of Helmholtz resonant cavities, and the plurality of Helmholtz resonant cavities are respectively divided into a plurality of sub-resonant cavities; each of the second partitions is provided with a second mounting hole for connecting the two sub-resonant cavities on both sides thereof; A plurality of first sound mouthpieces, wherein the plurality of first sound mouthpieces are embedded in the plurality of first mounting holes in a one-to-one correspondence, and each of the first sound mouthpieces is connected to a tire cavity and one of the plurality of sub-resonance cavities of the corresponding Helmholtz resonant cavity; A plurality of second sound mouthpieces are embedded in the second mounting holes of the plurality of second partitions in a one-to-one correspondence.

2. The noise reduction wheel structure capable of suppressing broadband structure-borne road noise according to claim 1, characterized in that: The length of the second sound mouth is greater than or equal to the thickness of the second partition.

3. The noise reduction wheel structure capable of suppressing broadband structure-borne road noise according to claim 2, characterized in that: Both ends or one end of the second sound mouthpiece protrudes from the second partition plate, or both ends of the second sound mouthpiece are flush with the second partition plate.

4. The noise reduction wheel structure capable of suppressing broadband structure-borne road noise according to claim 1, characterized in that: The inner cavity cross-sectional shape of the first sound mouthpiece and the inner cavity cross-sectional shape of the second sound mouthpiece are circular or non-circular.

5. The noise reduction wheel structure capable of suppressing broadband structure-borne road noise according to claim 4, characterized in that: The inner cavity cross-sectional shape of the first sound mouthpiece and the inner cavity cross-sectional shape of the second sound mouthpiece are petal-shaped or elliptical.

6. The noise reduction wheel structure capable of suppressing broadband structure-borne road noise according to claim 1, characterized in that: The inner cavity cross-section of the first sound mouthpiece and the inner cavity cross-section of the second sound mouthpiece are equal cross-sections or non-equal cross-sections in their respective axial directions.

7. The noise reduction wheel structure capable of suppressing broadband structure-borne road noise according to claim 6, characterized in that: The inner cavity cross-sections of the first sound mouthpiece and the inner cavity cross-sections of the second sound mouthpiece are gradually expanding and contracting in their respective axial directions.

8. The noise reduction wheel structure capable of suppressing broadband structure-borne road noise according to claim 1, characterized in that: The inner cavity shape of the first sound mouthpiece is the same as or different from the inner cavity shape of the second sound mouthpiece.

9. The noise reduction wheel structure capable of suppressing broadband structure-borne road noise according to any one of claims 1 to 8, characterized in that: The first sound mouthpiece extends into the corresponding sub-resonance cavity.

10. The noise reduction wheel structure capable of suppressing broadband structure-borne road noise according to any one of claims 1 to 8, characterized in that: The first mounting hole is a stepped hole, the inner diameter of one end of the first mounting hole away from the corresponding sub-resonance cavity is larger than the inner diameter of the other end close to the corresponding sub-resonance cavity, and the outer shape of the first sound mouthpiece is adapted to the shape of the first mounting hole.

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