Patent ID: 11900908
Assignee: CITIC DICASTAL CO., LTD.
Field: Other consumer goods (Other fields)
Classification: CPC G  B | IPC B  G

Claim 0:
1. A wheel with a sound absorbing device, the sound absorbing device being installed in a wheel air chamber to reduce acoustic resonance, wherein the sound absorbing device comprises at least two resonance sound absorbing structure units, wherein the first sound absorbing frequency band of the first resonance sound absorbing structure unit and the second sound absorbing frequency band of the second resonance sound absorbing structure unit are adjacent to each other or partially overlap each other, and the resonance frequency of the wheel air chamber is contained in the adjacent location of the first sound absorbing frequency band and the second sound absorbing frequency band or in the overlapping area of the first sound absorbing frequency band and the second sound absorbing frequency band; the sound absorbing device is constructed as a box body composed of the first resonance sound absorbing structure unit and the second resonance sound absorbing structure unit in parallel, and the box body is fixed on the hub of the wheel, wherein the sound absorbing device integrally forms a structural resonance sound absorbing device, and serving as the structural resonance sound absorbing device, the sound absorbing device has a first-order natural mode frequency consistent with the first-order natural mode frequency of the wheel air chamber,
wherein the sound absorbing device has two side faces that define the boundaries of the two ends of the box body in the circumferential direction of the hub, wherein an open end side face is formed at one end and has an opening leading into a hollow cavity in the box body, and a closed end side face is formed at the other end, and wherein the first resonance sound absorbing structure unit and the second resonance sound absorbing structure unit of the sound absorbing device respectively form an uniporous Helmholtz resonator, wherein the interior of the box body is divided by a partition plate extending along the circumferential direction of the wheel hub into a first hollow cavity and a second hollow cavity, which are arranged side by side, pipe orifices of a first hollow pipe and a second hollow pipe are formed in the open end side face, the pipe orifices are open toward the wheel air chamber, and the first hollow pipe and the second hollow pipe respectively extend into the first hollow cavity and the second hollow cavity by distances corresponding to the pipe lengths thereof;
and wherein the resonance frequencies of the two Helmholtz resonators are not the same, the resonance frequency of the first Helmholtz resonator formed as the first resonance sound absorbing structure unit is greater than or equal to the resonance frequency of the wheel air chamber, and the resonance frequency of the second Helmholtz resonator formed as the second resonance sound absorbing structure unit is less than the resonance frequency of the wheel air chamber.